DLGJ 158-2001 Technical Code For Fixed Steel Platform and LaddersDesign of Fossil-Fuel Power Plant

 

China Electric Power Planning and Engineering Association

Technical Code for Fixed Steel Platform and Ladders Design of Fossil-Fuel Power Plant

火

发电厂钢

平台扶梯设计技术规定 

DLGJ 158-2001

Chief development organization: organization: Northeast Power Design Institute of the State Power Corporation Approval department: China Electric Power Planning and Engineering Association Association Implementation date: December 1, 2001

 

 

China Electric Power Planning and Engineering Association

DIANGUIXIEBIAOZHI [2001] No. 52

Notice on Issuing Is suing DLGJ 158-2001 "T "Technical echnical Regulations of Designing the Steel Platform Escalator of the Thermal Power Plant"

All the electric power design institutes: According to the arrangement of the power survey and design standardization task, D L G J l58 200l "Technical Regulations of designing the steel platform escalator of the thermal power plant", editored chiefly by the Northeast Electric Power Design Institute of the State Power Corporation of China, has already been censored, now is i s approved to be issued and to be implemented on Dec. 1st, 2001. All relevant organizations are kindly requested to inform or write to the Technical Committee of the Power Planning Standardization [Standardization Quality Ministry of China Electric Power Planning and Designing Association] and the chief development organization-Northeast Electric Power Design Institute of the State Power Corporation of China at any time if they find something incorrect or something to be complemented during the process of implementing this code.

China Electric Power Planning and Design Association July 16th, 2001

 

 

Foreword This code is established according to the tasks assigned by the Electric Power Planning and Designing Institute of the State Power Corporation in the "Science, Standardization, Information"  program in 1999. It aims to regulate the steel platform escalator design of the thermal power plant with a view to be designed safely, beautifully and practically. It is a compulsory code in the engineering design and is also a basic document for formulating the "Steel Platform Escalator Design Handbook of the Thermal Power Plant ". This code specifies the concrete details of designing the steel platform escalators according to the characteristics of the thermal power plant as well as the safe and technical specification of the GB 4053 fixed designing the steel platform, escalator and rail. The appendix A and appendix B of this code are Normativees, while appendix C and appendix D are Informativees. This code is formulated in the trade for the first time, so any advanced technical skills and any  problems being found during the process of implementing implementing it shall be fedback in time in orde orderr to be revised in time. This code is proposed by the Electric Power Planning and Designing Institute and is under the  jurisdiction of the China Electric Electric Power Planning Planning and Design Association. This code is interpreted by the Northeast Electric Power Design Institute of the State Power Corporation of China. This code is formulated by the Northeast Electric Power Design Institute of the State Power Corporation of China. This code is mainly drafted by Liang Hui.

 

 

Contents Foreword...........................................................................................................................................3 1 Scope..............................................................................................................................................1 2 Standard References.......................................................................................................................2 3 Terms and Symbols........................................................................................................................3 3.1 Terms................................................................................................................................... Terms...................................................................................................................................3 3 3.2 Symbols...............................................................................................................................4 4 Basic Regulations...........................................................................................................................5 5 Platforms........................................................................................................................................7 Platforms ........................................................................................................................................7 5.1 Selection of the Platforms Platforms ...................................................................................................7 5.2 Platform Loads....................................................................................................................7 5.3 Stiffness Stiffness of the Platforms Platforms ....................................................................................................8 6 Escalators .....................................................................................................................................10 6.1 The Inclined Ladders.........................................................................................................10 6.2 The Vertical Vertical Ladders .........................................................................................................11 ......................................................................................................... 11 7 Protective Rails ............................................................................................................................14 7.1 Installation of the rails.......................................................................................................14 7.2 Height of the Handrails Handrails .....................................................................................................14 7.3 Materials of the Rails Rails ........................................................................................................14 7.4 Installation of the Rails .....................................................................................................15 8 Combinations and Installation of the Platform Escalators...........................................................16 Escalators ...........................................................16 9 Welding ........................................................................................................................................16 9.1 Welding Welding Requirements Requirements ......................................................................................................16 9.2 Splice of the Materials ......................................................................................................17 Appendix A (Normative)................................................................................................................. (Normative).................................................................................................................20 20 Appendix B (Normative) ................................................................................................................25 Appendix C (Informative)...............................................................................................................27 Appendix D (Informative) ..............................................................................................................28

 

 

 

1 Scope 1.0.1 This code is applicable to the operation, maintenance and connection of the steel platform

escalators designed for the operation, inspection and repair service of the technology professional of the thermal power plant. It also can be taken for the minimum standard of procuring the  platform escalators and and their related equipments. equipments. 1.0.2 This code is applicable to the following conditions: 1  The Conventional Island of the nuclear power station without prejudice to the nuclear power

safety condition; 2 when the foreign projects implement China Standard after coming to an agreement; 3  The boiler body or other equipments supplementing the platform escalators could apply this

code, but the styles of them should be consistent with the original. 1.0.3 This code is not applicable to the platform escalators utilized in the civil work, other civil

transportation, fire protection, communication tower, telegraph pole, and chimney, etc.

 

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2 Standard References The provisions in the following standard become part of this code by quotation of it. At time of  publication of this code, all editions indicated are valid. And all standards standards are subject to be revised. All the parties applying this code should study the possibility of applying the latest edition of the following standards. GB 4053.1-93 safety requirements for fixed steel vertical ladders GB 4053.2-93 Safety requirements for the fixed steel inclined laddersGB 4053.3-93 Safety requirements for the fixed industrial protective railings GB 4053.4-83 Safety requirements for the fixed industrial steel platform GBJ 17-88 Code for the Design of Steel Structures Structures GBJ 9-87 Load Code for the Design of Building Structures GBJ 205-83 Code for Construction and Acceptance of Steel Structure Engineering JGJ 8l-91 Specification for Welding of Steel Structure of Building DL 5007-92 Code for Construction and Acceptance of Electric Power Erection Welding piece of the thermal power plant DIANANSHENG [1994] No. No. 227

 

Working regulation regulation of pow power er sa safety fety

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3 Terms and Symbols 3.1 Terms 3.1.1 Platform: the horizontal place which is higher than the relative datum plane and is provided

for the staff to pass, maintain, inspect and repair. repair. 3.1.2 Passing platform: platform provided only for the staff passing. 3.1.3 Maintenance platform: platform provided for the maintenance. 3.1.4 Staircase platform: platform provided for the rest or change of marching direction between

the benches. 3.1.5 Fixed steel inclined ladder: steel ladder fixed on the building or equipments with 30°～75°

angle horizontally. horizontally. 3.1.6 Ladder beam: the side beam on both sides of the steel inclined (vertical) ladder. 3.1.7 Pedal (rung): horizontal member when going upstairs/downstairs. 3.1.8 Riser: the vertical distance between the adjacent pedals (rungs). 3.1.9 Ladder height: the vertical distance from the ladder beam top to the bottom datum plane. 3.1.10 Ladder width: space between of the inner sides of the two ladder beams. 3.1.11 Support: member of fixedly connecting the steel vertical ladders to buildings or equipments

as to vertical ladders; the supporting structure set on the maximum span scope as to the platform. 3.1.12  Fixed steel vertical ladder: steel vertical ladder installed fixedly on the buildings or

equipments and vertically with the horizontal plane. 3.1.13 Escalator: the general designation of inclined ladders and the vertical ladders. 3.1.14 Rail: safety protective facilities installed fixedly along the platform passage and the open

edge of the workplace. 3.1.15 Column: the vertical member of the rail. 3.1.16 Handrail: the protective member fixed to the top of the column, or the safety handle set on

the top of the steel vertical ladder.

 

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  3.1.17 Cross beam: the connecting member fixed to the middle of the column. 3.1.18 Baffle: the protective plate fixed to the bottom of the column. 3.1.19  Safety cage: safety member which is fixed on the vertical ladder beam and is used to

 protect the climbers. 3.1.20 Gradient: the angle between the inclined ladder beam and the horizontal plane. 3.1.21  The handrail height of the inclined ladder: the vertical distance from the handrail upper

edge to the pedal front edge. 3.1.22  Pedal width: the pedal dimension corresponding to the marching direction of the human

footplate when climbing the stairs. In convenient for the stairs climbing, the ghost of upper/down  pedal should not be larger than 30 mm, so this dimension decreases whereas the inclined ladder angle increases. 3.1.23 Bench: one section of the ladder among the segmental escalators sectioned by the staircase

 platform. 3.1.24 Te  Terrace: rrace: cantilever short platform on one end without ssetting etting support. 3.2 Symbols 3.2.1 De--the flexural member allowed maximum bending deflection. 3.2.2 l--the flexural member span. 3.2.3   --the inclined ladder angle, generally refers to the angle between the inclined ladder and

the horizontal plane. 3.2.4 R--the inclined ladder l adder riser. riser. 3.2.5 T--the inclined ladder tread. 3.2.6 h--the platform rail height, generally refers to the t he vertical distance from the platform plane to

the handrail's top edge.

 

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4 Basic Regulations 4.0.1 The design of the platforms, escalators and rails should have enough strength and stiffness  

with attractive appearance, convenient fabrication, economic and rational materials in use. 4.0.2  The platform escalators should be installed according to the actual demand and the

engineering entire arrangement of such equipments of the thermal power plant as all kinds of rotating mechanics and pumps; all kinds of tanks and wares; all kinds of doors, holes and valves; all kinds of monitoring, measurement and control equipments as well as samples. And the installation should meet the following requirements: be able to arrive at every operation and inspection site of the equipments and pipe components safely and conveniently, also be able to satisfy the demand of operation, maintenance, inspection and repairment. 4.0.3 The technical requirements of installing the platform escalators 1  The platform should be installed and connected on the firm supporting structures and should

also have enough stability, the staircase platform should not be hung on the bench. To platform suspended under the civil work structures, the support, when necessary, should be added to avoid shaking. 2 Except for the following conditions, the platforms and the escalators all adopt fixed connection. 1) One end of the platforms or the escalators between the equipments connecting to the relative

displacement could adopt oval screw and bolt connection. 2)  The platform needing disassembling when inspected and repaired should be designed in

detachable form. 3  All the members like the platforms, inclined ladders, vertical ladders, rails and support, etc.

should have smooth surface and should not have such defect as distortion, deflection, deformation and so on after the installation. 4.0.4  The materials of the platforms, escalators and rails should be selected according to the

following principles: 1 Adopt the steels with their performance not lower than Q235 一 A.F or Q235-A when the winter

calculated temperature is higher than -20 ℃. 2  Adopt the steels with their performance not lower than Q235-D or the low alloy steels Q345

when the winter calculated temperature is equal to or is lower than -20. 4.0.5 The platform escalators and their corresponding parts should adopt the general design and

 

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factory fabrication according to the operating conditions. When the complicated platforms and special angular escalators could not adopt the general design, they can be designed by the design handbook provided method, and at the same time the construction drawing should be given detailedly. 4.0.6 Where there is inadvisable or is hard to install fixed maintenance, inspection and repairment

 platforms, there can install install mobile lifting platforms. 4.0.7 Except for special indication, all the steel structure of the platform escalators should adopt

welding connection which should comply with the "Specification for We Welding lding of Steel Structure of Building", "Code for the Design of Steel Structures" and "Code for Construction and Acceptance of Steel Structure Engineering". 4.0.8 To all the platforms, escalators and rails with the equipments supply of the manufacturers,

the limitations on their type, carrying capacity, applied materials, strength and stiffness should comply with the power station's requirement and should be defined in the technical agreement. And special parts (for example, the platforms front front the boiler boiler drum,

soot blower or attemperator attemperator

 platforms, fuel oil operating platform, electrostatic precipitator, etc.) should put forward definite requirements in the technical agreement according to the actual demand. 4.0.9  The steel platform escalators should adopt antisepsis measures according to their located

environment. The indoor platform escalators should be painted 2 degrees anti-rust paint first and then be painted 1～2 degrees silver gray mixed paint; The outdoor platform escalators should be  painted 2 degrees mica ferric oxide phenolic aldehyde primer first and then be painted 2 degrees mica ferric oxide finish coat; while the platform escalators in the coastal salt mist regions or in the corrosive gas environment should adopt surface zinc-soaking antisepsis measures. 4.0.10 Regulations for the Design of the Construction Drawing 1 Each professional platform escalator forms one volume solely and the location dimension of it is

shown in the head page of the figure. 2 The position of the rail columns should be shown proportionally using the black spot in the plan

according to the design idea. It is not necessary to sign the concrete dimension of the column space between, but the requirements for column design should be mentioned. 3 The design load of the platforms should be signed respectively in the figure.

 

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5 Platforms 5.1 Selection of the Platforms 5.1.1 The fabrication of the platforms should not adopt common smooth steel plates. 5.1.2  No matter the conditions in 5.1.3 exist or not, such platforms should all adopt checkered

steel plate compact platforms, for example, platforms used in special places (for instance, the top of the explosion-proof door), platforms with liquid likely to leak and injure people (for instance, the places of the boiler drum or other pressure vessels installing liquid level meter which is prone to crack), or platforms for the operation and maintenance of the fuel oil regulating valves, etc. 5.1.3 The platforms in the places prone to accumulate powdered coal and dust as well as places

arranging the outdoor boilers and other outdoor equipments should adopt grid plate platforms. 5.1.4 The platforms except the ones mentioned in 5.1.2 and 5.1.3 should adopt either grid plate

 platforms or checkered checkered steel plate platforms. platforms. 5.1.5  The width of the passing platforms should not be less than 700 mm and the vertical

clearance should not be less than 1800 mm; while the width of the staircase platforms should not  be less than the bench width and the length of the marching direction should not be less than 850 mm. 5.2 Platform Loads 5.2.1 To the platforms for the production and operation without materials and equipments on them

and only with the staff and few visitors stopping on them (for instance, passage, throttle and valve operation platforms, flash tank platforms, terrace, monitoring, measurement, control, sampling  platforms and so on), the standard equivalent uniformly distributed static loads of them should 2

adopt 2kN/m . 5.2.2 To platforms for the inspection and repairment with materials and equipments on them, or

 platforms with crowd (for instance, the deaerator, deaerator, medium speed coal grinding mill, thickness  powder separator, powdered coal conveyor, conveyor, hot net heater, small metal coal scuttle platforms and so on) as well as the staircase platforms, the uniformly distributed static loads of them should 2

adopt 4kN/m . 2

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5.2.3 The platforms designed according to the normal value 2kN/m   or 4kN/m   of the standard

equivalent uniformly distributed loads should adopt typical design. 5.2.4 The design loads of the platforms with specific purpose and larger loads should be confirmed

according to the actual conditions and should be designed according to the calculation method

 

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 provided by the design handbook handbook and the type of the typical design. 5.2.5 The calculation of the platform structures, strength, stability and connection strength of the

members should adopt load design value (the load normal value multiplies by the partial load factor); and the calculation of the deformation should adopt the load normal value. And the partial load factor should be adopted according to the "Load Code for the Design of Building Structures". 5.3 Stiffness of the Platforms 5.3.1  The stiffness of the grid plate: the maximum bending deflection of the grid plate in its

longitudinal direction (the direction of the flat steel length l) should be De ≤l/150 and should not be larger than 20 mm. The standard grid plate should be adopted ensuring the technology quality and  performance. 5.3.2  The stiffness of the checkered steel plate: the maximum bending deflection should be

De≤l/150 according to the calculation simply supported on four sides of the equivalent uniformly distributed loads, and the thickness of the checkered steel plate should be larger than 4 mm and  better be 5 mm. 5.3.3 In order to meet the requirements of the deflection of the grid plate or checkered steel plate,

the angle steel stiffener should be installed in the following positions along the frame length direction: 1 the maximum span place allowed by the t he checkered steel plate frame calculation. 2 The grid plate frame 1) In the maximum span place (namely the adjacent place between two grid plates) allowed by the

flat steel bar calculation when the flat steel bar is paralleled to the frame length direction. 2) The angle steel stiffener should be installed when the flat steel bar is vertical to the frame length

direction; the platform length is larger and there needs improving the stability of the frame. This is shown in appendix D. 3 The allowed maximum deflection of the stiffener should be De ≤l/150. 5.3.4 The stiffness of the frame: the maximum deflection of the frame should be De ≤L/250 when

the platform length is L. There needs installing supporter and hanger within its limit span when the platform span exceeds the limit span. And when the engineering hanger and support points cannot but exceed the limit span, the larger channel steel can be selected as the frame through calculation. 5.3.5 The liaison platforms should gain the agreement of the manufacturers to be installed on the

 platforms of the boiler or other equipments, or should meet the requirements of the strength and

 

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deflection carrying capacity of the original platform, or else the corresponding reinforcement should be made in the joint of the original platform. 5.3.6 The platform brackets can be used directly when they satisfy the operating conditions of the

typical design, or else they should be confirmed by calculation. And the members can be designed according to the handbook provided method and should also comply with the "Code for the Design of Steel Structures".

 

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6 Escalators 6.1 The Inclined Ladders 6.1.1 The inclined ladder is composed by ladder beam, pedal and handrail. The design, fabrication

and installation angle of the inclined ladders should be confirmed by the following principles: 1 As a rule, the standard angle 45°, 50° and 60° of the typical design are applied. Only in certain

 particular cases could could the inclined ladders of other other angle be applied. applied. 50° whe when n frequently frequently used； 

ladders of 45° or 2 Adopt the inclined ladders

3 Adopt the inclined ladders of 60° when seldom used by the staff, seldom used for the materials

handling and limited by the arrangement conditions; 4 Adopt the vertical ladders when the inclination is larger l arger than 75°. 6.1.2 The width of the inclined ladders should be confirmed by the following principles: 1  The maximum width of the inclined ladder should not be larger than 1100 mm while the

minimum width should not be less than 600 mm; 2 Adopt 800 mm when the inclined ladder is used both for the materials handling and the staff

 passing; 3 Adopt 600 mm only when seldom used by the staff, seldom used for the materials handling and

limited by the arrangement conditions; 4 The inclined ladder should better adopt the typical design. If they could not be used directly due

to the concrete conditions or they are ones with larger width, the inclined ladders should be calculated and designed according to the handbook provided method and should be consistent with the type of the typical design. Table 6.1.3 Numerical Table of the Inclined Ladder Riser R and Tread T    

30°

35°

40°

45°

50°

55°

60°

65°

70°

75°

R(mm)

160

175

185

200

210

225

235

245

255

265

T(mm)

280

250

230

200

180

150

135

115 115

95

75

6.1.4  The inclined ladder height should not exceed 5 mm, if so, there should install staircase

 platforms and install ladders ladders sectionally. sectionally. 6.1.5 The live load and stiffness of the steel inclined ladders should adopt the value according to

 

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the following standards: 2

1 The live load on the horizontal projection plane of the inclined ladders should adopt 3.5kN/m ; 2 The concentrated live load of the pedal midpoint should adopt 1.5kN; 3 The horizontal live load of the top of the handrail should adopt 0.5kN/m; 4 The deflection should not be larger than L/250 of the flexural member span.

When necessary, necessary, the value can be designed according to the practical required live load but should not be less than the above mentioned normal value. 6.1.6 The vertical clearance on the top of the footboard of the inclined ladders should not be less

than 2000 mm. For pipes above the inclined ladders, the vertical distance from their incubation external surface to the inclined surface of the inclined ladders should not be less than h mm. The vertical distance h 1800 1700 1500

6.1.7 The inclined ladder pedals should better adopt the grid plate finished products produced by

the manufacturers and should also be made by the steel plates when seldom or not ordered. And when there are on steel plates, the pedals can be made by the flat steel bars of 25×4 or the checkered steel plates with their basic thickness no less than 4 mm. 6.2 The Vertical Ladders 6.2.1 Structural regulations for the vertical ladders

The vertical ladder is composed by ladder beam, stuck, support, handrail and safety cage.

 

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  1  Width: adopt 500 mm. It can be reduced if limited due to some concrete conditions and the

climbing height is less than 5000 mm, but it should never be less than 300 mm. 2 Height: the bench height should not be larger than 9000 mm, if so, there should install staircase

 platforms. If the climbing height is 15000 mm or under 15000 mm, the space between of the staircase platforms is 5000～8000 mm; If the climbing height is higher than 15000 mm, there should install one staircase platform for every 5000 mm. All the staircase platforms should install  protective rails and the height of these rails should be designed according to the regulations in 7.2.1. 3 Stuck: The stuck are distributed isometrically with their space between 300 mm. The stuck on

the upper end is paralleled to the platform, as the first step is the adjusting step, so the space  between should not be less than or should be equal to 300 mm. The clear distance between the stuck center line and the equipments or the building external margin should not be less than 150 mm and also should not be larger than 250 mm. 4 Handrail: The upper end of the vertical ladder needs installing handrail with its height no less

than 1200 mm. 6.2.2 Component Regulations R egulations for the Vertical Ladders 1 Ladder beam: adopt the flat steels of no less than 60×8 or the equal-leg angle steels of 50×5 to

fabricate the ladder beams. The distances from the beams outer side to the wall, equipments and other objects should not be less than 750 mm; 2 Stuck: adopt round steels of no less than  20. The length of the stuck is 5 mm through the

outer sides of the two adjacent ladder beams. The ends of the stuck should be spot welded with the ladder beam, but every 1500 mm of the stuck needs full welding as well as the first stuck and the last one. 3 Support: The footless steel vertical ladder should adopt the equal-leg angle steels of no less than

75×6 as the support and the support should be welded fixedly with the equipments or embedded  parts. The bottom support is 300 mm away from the ground (the platform), the space between of the support should be less than 3000 mm and should not be less than two pairs of support; 4 Safety cage: safety cage should be installed if the bench height exceeds 3000 mm, the bottom

end of it is 2200 ～  2400 mm away from the ground ground (the platform), while the hei height ght of the upper end higher than the datum plane should be consistent with the rail height regulated in 7.2.1. The diameter of the safety cage is 700 mm and the center of it is 350 mm off the stuck center line. The horizontal circles circles adopt the flat steels of no less than 40×4 and and the space space between of them is ~750 mm, and there there need welding welding five vertical vertical flat steel bars of no less less than

450

25×4 uniformly

distributed in the inside horizontal circles.

 

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6.2.3 Load regulations for the design of the steel vertical ladders 1  The ladder beam load should be calculated by the 2kN concentrated live load beared by the

upper end after its combination, and there need installing support, the space between of which should be confirmed by its height and the slenderness ratio of which should better not be larger than 200; 2  The load of the stuck should be calculated by the 1 kN concentrated live load beared by the

midpoint and the deflection of it should not be larger than l/250 of the stuck length. 6.2.4 Combination and installation of the steel vertical ladders 1 The combination of all the steel vertical ladders should adopt welding connection and should

comply with the requirements in GBJ 205- 83 and the third clause in 4.0.3 of this code. 2 To the steel vertical ladders fixed on the ground (or the platforms), when the upper ends of them

have not relative displacement, the support of them should be fixed with the platform beams or the equipments. 3 To the steel vertical ladders fixed on the equipments, when the upper ends of them have relative

displacement, one fixed support should be installed and the other support should set up slotted hole on the ladder beams and adopt bolted splice.

 

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7 Protective Rails 7.1 Installation of the rails 7.1.1 Except for the conditions in 7.1.3 in the thermal power plant, all the platforms, pedestrian

 passageways, hatchways hatchways and places with falling falling danger should install the protective protective rails. 7.1.2 The rail is composed by column, handrail, cross bar and baffle, and the rails of the inclined

ladder needn't installing baffle. 7.1.3 The environment round the platforms should install the t he rails except for the up/down passages

close to the wall or the equipments or connecting to the platforms. Only the platforms of less than 1000 mm off the ground need not installing the rails. 7.1.4 Both sides of the inclined ladders should install rails, only when the inclination angle is less

than or is equal to 50° and one side is close to the wall could the other side solely install the rails. 7.1.5  Utilize other facilities (for instance flue duct) as the temporary walkway, and when the

height of them off the ground is larger than 1000 mm, there need installing the protective rails. 7.1.6  The top of the steel fuel oil drum should install rails round the drum, loose wire netting

should be installed between the cross bar and the oil drum , and the wire netting and the rails should be lashed together fixedly. 7.2 Height of the Handrails 7.2.1 The height of the handrails should not be less than 1000 mm. The height of the handrails in

the platform, pedestrian passageways, hatchways and places with falling danger of 20 m off the ground should better be 1050 mm; while the height of the handrails in these places of equal to or larger than 20 m off the ground should not be less than 1200 mm. 7.2.2 The handrail height of the inclined ladders should better be 1050 mm. 7.3 Materials of the Rails 7.3.1 The materials of all the members of the rails should be confirmed by the regulations in 4.0.4. 7.3.2  The columns and handrails of the rails should adopt the steel pipes of  33.5×3.25; the

cross bars should adopt the round steels of no less than  16; and the baffles should adopt the flat steels of 120×3. 7.3.3  Materials with their performance superior to and their specification larger than the above

 

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mentioned materials can also be adopted after reasonable argumentation and approved by the related departments according to the engineering actual situations. 7.4 Installation of the Rails 7.4.1 The connection of the all the members of the t he rails should adopt welding. 7.4.2 Installation regulations for the columns 1 Columns on the platform rails should be installed on the outside and be vertical to the platforms.

They should be distributed uniformly and the space between of them should not be larger than 1000 mm.Columns should also be installed near the corner or on the top, or connected to the  buildings fixedly. fixedly. 2 Columns of the inclined ladder rails should be welded on the ladder beams and be vertical to the

ground. The installation of the first column should make top of the handrails about 900 mm off the ground (the platforms) (shown in appendix A). And the space between of the columns should not  be larger than 1000 1000 mm. 7.4.3 The handrails should be welded fixedly with the columns, and after the welding, they should

 be burnished smoothly by the grindstone and by the clearance of welding slag and burr. burr. The welding corner should take on the circular arc (by using the fire simmering or thermocompressing the elbows), and the connection of the handrails of both the platforms and the inclined ladders should be transited smoothly. The handrails origin of the inclined ladders should be bent downward and be vertical to the ground. 7.4.4 Installation regulations for the cross bars 1 The platform rails should install two cross bars and should be divided equally into three parts

each with h/3 height, and these two cross bars should be spot welded through the columns. And the clear space between of the cross bars and the up/down members should not be larger than 380 mm. 2 The inclined ladder rails should install one cross bar in the middle which should be spot welded

through the columns. And this cross bar begins with the first column and ends with the platform column, and should be welded fixedly with them. 7.4.5 Installation regulations for the baffles 1 The baffles should be installed on the inner side of the columns and should be welded fixedly

with these columns. 2 The lower side of the baffles indoor should be flush with the platform surface; while that

outdoor should be 10～20 mm higher than the platform surface.

 

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  3  All the inclined ladders and platforms of less than 1500 mm off the ground could not install

 baffles without special special requirements.

8 Combinations and Installation of the Platform Escalators 8.0.1 Escalators, with their height exceeding 5 m or demanding to change the marching direction,

should install the staircase platforms, the dimension of which should be confirmed by the regulations in 5.1.5. 8.0.2 When the platforms connect to the platforms or to the terraces, the joints need adding the

stiffening channel steels with their specifications similar to the connection platform channel steels (shown in figure 4 of appendix A) as well as calculating whether the platforms are within the limit span or not, or else brackets should be added under the platforms. 8.0.3 When struts connect to the platforms, pl atforms, the centroid axles of the platform channel steels should

 be coincided with that of the struts (shown in figure 2 of appendix appendix A). The base plates of the struts should be installed on and welded fixedly with the pre-embedded steel plates (shown in figure 11 of appendix A). 8.0.4 The schematic diagrams of combination and installation of the platforms, inclined ladders,

terraces, struts, brackets, rails and baffles are shown in appendix C.

9 Welding 9.1 Welding Requirements 9.1.1 The connection of all the members like the platforms, brackets, rails and escalators should

adopt welding, and the applied electrodes are as follows: carbon steels adopt E43 type (designation J42); Q345 steels adopt E50 type (designation J506, J507). When welded under the environments of rain, snow and wind, the welding need proper protective measures, and when the environmental temperature is lower than -20℃, the weldments need to be preheated. The welding technology should be implemented by the "The Welding Piece of Technical Code for the Construction and Acceptance of the Power Erection". 9.1.2  The brackets on the columns could adopt either face-up bonding or side welding. When

adopting the side welding, the lap length of the horizontal channel steels should adopt 100 mm (shown in figure 12 of appendix A). And when the brackets weld with the load-bearing steel columns and steel beams the following points should be paid attention to: the welding heat is not allowed to cause the deformation of the steel columns and steel beams, the welding should be carried out slowly and intermittently in order to decrease the influence of the welding heat.

 

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9.1.3 The strength of the welding seam should not be lower than the equivalent design strength of

the weldments and the height of the welding seam should be equal to the minimum thickness of the weldments. Round welding, both sides welding, one side welding or intermittent welding can  be adopted. When the length of the welding seam seam is short, the stiffening stiffening plates can be added. added. 9.1.4 Welding of the stuck and the ladder beams of the vertical ladders: except that the two ends

need be fixed by full welding, the middle stuck also need be full welded when the height of the vertical ladder is less than 3000 mm; and when the height is larger than 3000 mm, the first one of every five steps need be fixed by full welding; and the stuck and ladder beams of the rest steps can  be fixed by spot welding (shown (shown in figure 7 of appendix appendix A). A). 9.1.5 The connections of channel steels and channel steels, angle steels and angle steels, channel

steels and angle steels of the platform frames should be welded according to the interlock dimension (shown in appendix B). 9.1.6 The welding, combination and installation of the platforms, escalators, rails and brackets are

shown in appendix A and appendix C; the welding of the checkered steel plate platforms and the grid plate platforms are shown in appendix D. 9.2 Splice of the Materials 9.2.1 Splice regulations for the angle steels

Specification of the

 

Specification of the stiffening plates

angle steels

    

B

L

∠75×50×8

6

30

100

∠75×75×8

6

40

100

∠100×63×10

6

40

100

∠100×100×10

6

60

100

∠160×100×12

8

∠160×160×16

8

Small edge 60; large edge 100 100

100 100 17

 

  When the thickness of the angle steels is less than 6 mm splice, then the stiffening steel plated needn't be installed, but the welding seam groove should be opened. 9.2.2 Splice regulations for the channel steels

Channel steel  No. [10

Dimension of the stiffening plates

Height of the welding seam

L

B

    

K

-

-

-

5

Remark The stiffening steel plates are not required, but

[12.6

-

-

-

5

the welding seam groove should be opened

[14

140

100

6

6

[16 [20

160 200

120 140

6 6

6 6

9.2.3 Splice regulations for the steel plates 1 All adopt the straight seam welding. 2  When the platform width is larger than 1 m, the longitudinal splice is allowed and the splice

width should not be less than 300 mm. When the checkered steel plates splice, the figure direction should be consistent, the figure should be aligned, and each piece of the figure should not be less than 1 m, except the one at the end could be less than 300 mm.

 

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  3  The splice welding seam should be installed above the stiffening angle steels or else the

checkered steel plates need making 50/100 double sides welding or the splice needs adding the stiffening angle steels.

 

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Appendix A (Normative)

Welding Figure of Combination and Installation of the Platform Escalators (Illustration) (Illustration) A.0.1 Welding of the platform and the bracket

A.0.2 welding of the platform and the strut

A.0.3 welding of the platform and the terrace

 

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  A.0.4 welding of the stiffening channel steels added after the platform adds the terrace

A.0.5 welding of the escalator and the checkered steel plate platform

 

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A.0.6 welding of the escalator and the grid plate platform

A.0.7 Installation and welding of the climbing ladder  

A.0.8 Installation and welding of the handrail and the cross bar

 

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  A.0.9 welding of the bottom escalator and the rail stake/the ladder column

A.0.10 Installation and welding of the platform, column and the protective plate

 

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A.0.11 welding of the bottom of the strut

A.0.12 welding of the bracket and the strut

 

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  Appendix B (Normative) 

Interlock and Splice B.0.1 Splicing interlock dimension of the channel steels and channel steels

Common channel steels Channel

h

A

B

C

H

Hl

8

80

40

6

3

39

28

10

100

56

7

3

43

31

12

120

74

7

4

48

36

14a

140

90

9

4

52

40

16a

160

108

9

5

57

45

20a

200

148

9

5

66

54

25a 30a

250 300

196 236

10 12

6 6

71 78

60 64

steels

 Note: The imaginary line in the figure indicate the interlock dimension only allows allows opening the interlock of one side when the channel steels of different height splice to other channel steels. The splice of the angle steels and the channel steels could refer to the corresponding interlock dimension. B.0.2 Splicing interlock dimension of the equal-leg angle steels

 

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  Appendix C (Informative)

Combinations and Installation Schematic Diagram of the Platform Escalators

Note: The serial number names in the ○ can refer to the terms in 3.1.

 

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  Appendix D (Informative)

Welding of the Platforms D.0.1 Welding of the grid platforms

 

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  D.0.2 Welding of the checkered steel plate platforms

 

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