Formwork Handbook Dlf Capital Greens

Handbook On Methodology for Formwork System For DLF, Capital Greens

Prepared by: - Formwork Dept., RB&F, DLCL

L&T Construction

Doc Ref:-SOP/DLF Capital Greens/R0

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INDEX SL.

Topic

1)

General Information / Formwork strategy st rategy

2)

Methodology for formwork systems proposed HY-RIB Stopper use for construction joints Column formwork Wall formwork Flex Formwork system Cup lock system Access Scaffold system CB 150 A

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3)

L&T Stair tower system

4)

Form release agent & Plywood Pl ywood

5)

Roles & Responsibilities of site si te Engg. / Foreman and charge hand

6)

Standard allowable deviation as per IS 456:2000

7)

Formwork: hand tools

8)

Do’s & Don’ts in formwork  &  & stacking

9)

Stacking (Housekeeping)

10)

Water jet for efficient cleaning of Shutter panels

11)

Shuttering oil sprayer machine

12)

Formwork safety

13)

Accident Prevention

14)

Slab & Beam striking time as per the IS 456

15)

Formwork Check List

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Formwork Strategy Structure

System proposed

Total scope

Catering area

(Sqm)

(Sqm)

Isolated footings

Wall / Column FW

4838

227

Column square/ rectangle

Wall / Column FW

443544

7819

Retaining Wall

Wall / Column FW

5155

254

Beam & slab Conventional

Cup lock system

400697

10595

Peripheral/ Heavy beams

Flex System

447817

11841

Staircase

Flex System

23524

871

1325575

31608

Total FW Scope

CLUSTER BSCC IN-CHARGE

SITE PLANNING IN-CHARGE

As per the formwork ACE

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METHODOLOGY FOR FORMWORK SYSTEMS PROPOSED HY-RIB Stoppers for construction joints:

Hy-rib stoppers shall be used in the foundation where mass construction of concrete has to be done with-out any construction joints or heavy dense reinforcement is used where it is difficult to erect vertical formwork shutter.

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Hy-rib permanent formwork comprises of Zinc-coated steel which are formed into a ribbed expanded mesh. It is a lost type formwork item to form construction joints in concrete & Stopper ends for retaining walls, columns & beams. It can also be used to support horizontal slab flooring. It will produce a surface which will bond directly di rectly with the next pour.

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COLUMN FORMWORK SYSTEM SYSTEM DESCRIPTION:

Column Formwork is a complete Column Formwork system, mainly consists of plywood sheathing backing by timber H-Beams and Steel Waler which can be erected manually & also can be handled by crane. Besides giving smooth concrete finish this System comes with inbuilt safety and working accessories platform.

ork Platform

Lifting Bracket

Steel H-Beam  Alignment System Pl

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Method Statement for Column Formwork:

Formwork Erection: Making of shutter panels

1) Drill holes in H-beams for fixing beam clamp, lifting bracket & Working platform bracket. 2) Make shutter panels (without/with fixing of walers and accessories) of required size including cutting plywood for stitching with H-beams. 3) Fix of wooden planks (40mm) at top & bottom sides of shutters. Minimum size of column that can be done is 300mm x 300mm. 4) The shutter panels can be combined as an ‘L’ shaped panel using angle plate& lifted to next location. 5) Fix starter suitable to column size. 6) Remove the forms for starter after concreting is over. 7) After concreting clean the shutters with water jet for any excess / over concreting.

 Assembly of formwork:

1) Fix both shutter panels in position. 2) Fix tie rod, anchor plates and wing nuts at the corner of shutters in each waler level. 3) Fix Alignment props/supporting brackets with Head adaptor assembly and foot adaptor assembly on the adjacent sides of the shutters. 4) Plumb the shutter panels as required and checking the column size as per requirement. 5) Fix the stop anchor, anchor cone with PVC sleeve to facilitate for fixing of climbing bracket for next lift. Deshuttering of column formwork:

1) Remove side panels in after removing the alignment props, tie rods/accessories only. 2) Clean, apply oil and shift. 6

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WALL FORMWORK 

SYSTEM DESCRIPTION:

Wall Formwork is a complete Formwork system, which mainly consists of plywood sheathing backed by H-Beams and Steel walers (ISMC 100 B/B channels). The support is given by double nut alignment props which can be used to align the shutters to the required angle and position. These shutters can be erected manually &also can be handled by crane. Besides giving smooth concrete finish this system comes with inbuilt safety and working accessories.

Method statement for Wall Formwork:

Formwork Erection: Making of shutter panels

1) Lay waler @ distance (or) predetermined location over the leveled surface. (Either a timber platform or with lean concrete to accommodate the size of the shutter panel) 2) Drill holes in H-beams for fixing beam clamp, Lifting bracket & working platform bracket at predetermined locations using suitable power drill. 3) Drill holes in H-beams with Drilling plate & safe guard for fixing M 6 x 70 bolts with waler. 4) Place the H-beams above the waler and connect the same with beam clamp / M6 bolts. 5) Place the Plywood (the grains should be perpendicular to the timber beams) and ensure proper butting of plywood with the Assembly. 6) Use only screws (1.5” long) for fixing plywood with H-beams. (approx. 8 no’s for 8’ x 4’ plywood size ) 7

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7) Fix wooden planks (40mm thk. x 160 mm) at top & bottom sides of shutters. Provide slot in the top plank of lifting bracket location. 8) All the above should be done with an accuracy of ( + or -) 2mm 9) Any lengths of panel to suit the required dimension of walls can be formed using the available lengths of waler, splice plate & connecting pins, if the system is to be crane handled. Erection of wall formwork:

1) The wall panels should be placed on the outside first and all the gaps to be filled appropriately using fillers/sponge etc. for maintaining the form finish, then reinforcement can be tied and inner shutters be placed. 2) The wall panels should be placed alongside each other & aligned properly; edges checked using plumb bob and line threads. 3) The joints of the wall panels should be filled with sponge or appropriate filler material so that the slurry leakage is arrested. 4) The tie rod hole locations shall be made prior to erection of shutters so that the alignment &pattern of hole locations is to be maintained uniformly. No other holes should be allowed to drill later. 5) The grout check has to be fixed to the shutters at the top so that the concrete level can be maintained in a straight line for the pour and it also acts as a starter for the second pour above. 6) Fix timber spacers to maintain the wall thickness at top. 7) High strength tie system bears large concrete pressures and avoids load -bearing struts. 8) Panels can be made in large units for handling by crane and in smaller ones to facilitate manual handling. 9) Panels can be used along with Climbing Formwork system for the more height.

De-shuttering of wall formwork:

1) First remove Wing nut, Anchor plates, Tie rods, Head adaptor assembly, Alignment struts, Supporting Brackets, Foot adaptor assembly. 2) Remove shutters (each separately) with the help of crane or manually. 3) In case of subsequent lifts remove climbing brackets, Suspended platforms handrail post, accessories. 4) In case of shutter being used for subsequent lifts the Alignment struts head adaptor assy., Foot adaptor assy., Supporting Brackets need not be re moved. 5) Stacking of wall shutters shall be done vertically with fabricated steel racks (Ref. fig vertical stacking of formwork).

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FLEX SYSTEM SYSTEM DESCRIPTION:

The forms shall be made with plywood backed by H-beam & supported by using props. Props take the load and shall be erect in position using tripods for lateral stability. The spacing between the timber beams shall be in accordance with design criteria & should be properly screwed to the plywood and safely placed over the props to avoid toppling. The props are designed to take care of the vertical loads which are tested under maximum loading conditions. The spacing of CT prop will be decided based on the thickness of the slab i.e. load coming from the slab & the prop height required. More the height, the lesser will be the capacity so it should be ensured that use of props in the fully extended condition should be avoided.

Method statement for FLEX FORMWORK:

Formwork Erection: Erection of FLEX SYSTEM:

1) 2) 3) 4) 5) 6) 9

Mark Props location. Place main Props – I step, Tripods, - II step, Four way heads – III step. Use four way heads over props at the lapping joints of primary H-beams. Place primary & secondary layers of H-beams. Place plywood’s and screw with H- beams. No need to place tripod at all the prop Location but should provide at ends and joints of primary H-Beam

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7) Maintain the required level of slabs by adjusting the props . 8) Apply shutter release agent over plywood surface & fix masking tape in joints of plywood to avoid slurry leakage.

De-shuttering of flex formwork: 1) Lower the props height by collapsing. 2) Remove secondary beams and parallel remove plywood. 3) Remove primary beams. 4) Remove four way heads and Intermediate props. 5) Remove main props, four way heads, Tripods. 6) Clean and stack the plywood’s and H-beams for next portion. 7) Shift the materials to next location. 8) Use Stacking pallets for the shifting.

CUPLOCK SYSTEM SYSTEM DESCRIPTION:

Sequence for Assembling:

1. 2. 3. 4. 10

Level the ground and compacted the earth. Mark the Scaffolding location on the ground/floor. place the concrete sill or wooden sleeper above ground ( 300 x 300 x 150 mm ) Provide gap 300 mm between the scaffolding and permanent structure. SOP –DLF Capital Greens Released by :- Formwork Dept., RB&F, DLCL

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5. Erect Scaffold Screw jack. 6. Erect Vertical leg over screw jack and connect with horizontal bracing both directions at every cup location. 7. Rotate the cup by hammering gently to tight the bracing. 8. Level the Scaffold after fixing the first level of the leg with water level. 9. Fix the working platform over the horizontal bracing ( 50 mm thick Timber planks ) 10. Fix the next level of scaffold leg. 11. Brace the scaffolding with permanent structure and between towers at every 4.0 m height intervals. 12. For fixing of bracing with permanent structure to scaffolding, use 150 x 150x 6 mm thick insert plate welded with NB 40 mm pipe. 13. Use Anchor fastener 12 mm at 4 corners. 14. Use scaffold up to a maximum height 40 meters. 15. If Cup lock is used as staging, then place adjustable screw jack with U-head followed by other formwork components above it.

STEP-1

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STEP-2

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STEP-3

STEP-5

STEP-4

STEP-6

Sequence for dismantling :

1. If used as staging remove the above formwork arrangement by lowering the adjustable screw jack with U-head. 2. Route the cup by hammering. 3. Remove horizontal bracing (above the working level). 4. Remove the Vertical legs simultaneously at same level as mentioned above. 5. Remove the working platforms (scaffold board the level above the working level). 6. Remove the Bracing between towers / with permanent structure when dismantling work reaches level below. 7. Remove Screw jack. 8. Shift the materials to next position. 12

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Electrical safety guidelines: Scaffolds shall not be erected, used, dismantled, altered, or moved such that they or any conductive material handled on them might come closer to exposed and energized p ower lines than as indicated in the chart that follows:

Insulated lines voltage Less than 300 volts 300-15 kv More than 50 kv

Un Insulated lines voltage Less than 50 kv More than 50 kv

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Minimum distance 3 feet (0.9) 10 feet ( 3.1m) 10 feet (3.1m) plus 4 inches 10 cm for each 1 kv over 50 kv

Alternatives 2 times the length of  the line insulator   but never less than

Minimum distance

Alternatives

10 feet (3.1m) 10 feet (3.1m) plus 4 inches 10 cm for each 1 kv over 50 kv

2 times the length of the line insulator  but never less than 10 feet (3.1m)

10 feet (3.1M )

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GENERAL ACCESS SCAFFOLD SYSTEM DETAIL

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CB150A & CB150F FORMWORK SYSTEM for the Highrise vertical Column / Wall CLIMBING BRACKET 150A

SYSTEM DESCRIPTION: 

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The L&T-Formwork Climbing System are used for tall structures like cooling towers, etc. where very uneconomical & unsafe to provide staging or scaffolding for supporting the external or internal wall formwork. In this system bracket is hanged on anchors called lost stop anchors provided in the already casted wall and supports/alignments are taken from these brackets. The brackets are suitably braced to prevent any sway and are provided with walkways/working platforms / handrails etc. for safety and ease of working.

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CLIMBING BRACKET -150A 

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SEQUENCE

 Assembly of Simple Climbing Formwork  

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After dismantling the shutters from the 1st pour of concrete, remove anchor cone using DK spanner and fix climbing cone in the stop anchor. Assemble Climbing bracket 150 A –  2 no's (max distance should be 2.0 to 2.40 m) and brace with NB 40 pipes and couplers to form as a unit. Provide working platforms with 4“X 4” (or) timber as supporting member and 2” thick planks. Brace the primary member and climbing bracket with brace stirrup. Fix Handrail post on each bracket and hand railing at 2 levels should be done with NB 40 pipes & couplers. Lift the entire assembly of climbing bracket 150 A with the help of crane and place over the climbing cone correctly and lock the pin. Follow the procedures described in the assembly of wall formwork; however the alignment props to be fixed in the climbing bracket platform.

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Suspended platform 80 A should be fixed in the predetermined holes provided in the climbing bracket and brace the suspended platforms with NB 40 pipes and couplers. Provide 2” thick planks as wor king platform. Cover the open face of suspended platform with safety net. Check the verticality of the shutter using plumb bob.

Dismantling  

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Remove the wall panel assembly and keep it on the ground. Remove Climbing bracket set and lift to the next location and place over Climbing cone already fixed in position.

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L&T –  STAIR TOWER SYSTEM  Assembly of stair Tower:

1. Mark the Heavy-Duty tower location on the ground/floor (1525X2250 systems) 2. Erect H.D. Tower spindle with Foot plate and spring lock pin 16 dia. 3. Erect Basic frames 1.20 m height with 1525mm X 2250 mm Configuration over spindles and connect the frames with Diagonal and Horizontal bracing. 4. Level the basic frames after fixing the first level. 5. Fix Connection angle with frames and connect it with spring lock pins and click and pawl. 6. Fix the stair brackets (left & right) over horizontal member of the frames and clamp them. 7. Fix the Grid Irons over Stair brackets using bolts & nuts. 8. Fix Inner hand railing, Intermediate railing. 9. Fix Diagonal bracing 12225 with connection angle in each tier. 10. Fix Horizontal Bracing H-152 with connection angle in landing location. 11. Brace stair towers at every 6-m heights with the permanent structures .

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Dismantling of stair Tower:

1. Remove intermediate railing and inner hand railing from Top. 2. Remove Grid irons. 3. Remove the stair brackets (both left & right) 4. Remove Diagonal bracing, Horizontal Bracing 5. Remove connection angle. 6. Remove Bracing and frames. 7. Remove the Bracing between towers / with permanent structure when dismantling Work reaches that level. 8. Remove Tower spindles with Foot plates at bottom. 9. Stack the small components in the stacking pallet

STAIRTOWER WITH NET Description:

Stair tower’s outer frame has been modified to accommodate mesh so as to prevent both men and material from falling.

COMPONENTS 

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STFR 152 (Replacement of  basic frame 1.2) STFR 225 (Replacement of all bracings) STFR 225 OP (Half open for entry)

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Stair tower assembly

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FORM RELEASE AGENT AND PLYWOOD APPROVED FORM RELEASE AGENT 

FOSROC MAKE - REEBOL ( 20 – 60 SQM/LT)  BASF MAKE – RHEOFINISH 202 ( 30 – 70 SQM/LT)  DON MAKE – SET RELEASE RTU ( 22 – 30 SQM./LT)  CICO MAKE – CICO LEASE ( 20 – 60 SQM/LT) PLYWOOD IS CODES PLYWOOD FOR CONCRETE SHUTTERING WORKS – IS 4990:1993 

RESIN TREATED COMPRESSED WOOD LAMINATES ( Sl.no

Description

1

Moisture content

2

3 4

5

6

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Thickness of face veneer layer Timber

Mass

Adhesives 7

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Dimensional Tolerances

No. of ply in a board

8

Tensile Strength

9

Water Resistant Test

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Test Report

Specifications

Reference / Remarks

Moisture content not15%

For testing procedure refer IS 1734 (Part 1) :1983

Length=+6mm,-0mm, Width= +3mm, -0mm, Thk. tol.=for > 6mm = +/-5% & for < 6mm = +/10% Edge straightness & squareness 2mm per 1000mm i.e 0.2%,

Refer IS 12049 : 1987 for tolerance limits and thickness tolerance shall be as per IS 303 : 1989

not < 1.2 mm Any Plantation timber shall be used as raw material for 6mm - 3.90 kg/Sqm. for 9mm - 5.85 kg/Sqm for 12mm - 7.80 kg/Sqm for 19mm - 12.35 kg/Sqm for 25mm - 16.25 kg/Sqm Shall be of the hot press synthetic resin (phenol formaldehyde)

The accuracy of the mass specified can be taken only within a tolerance of +/10% Shall conform to IS 848 : 1974

7-ply / 9-ply not < 32.5 N/mm2 parallel to grain direction of the face veneers not < 22.5 N/mm2 right angles to grain direction of the face veneers sum of the tensile strength in both directions shall be not < 60.0 N/mm2 Shall conform to IS 1734 (Part 4) :1983 Each consignment shall be supplied along with Test Report on the above parameters

PLYWOOD FOR GENERAL PURPOSES (THIRD REVISION) IS 303-1989

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ROLES & RESPONSIBILITY OF FORMWORK ENGINEERS AT SITE 1. Preparation of formwork strategy based on the overall construction programme & GFC drawing. 2. Finalization and coordination of shuttering scheme and should execute as per the FW scheme drawings and design. 3. Ensuring effective and proper utilization of shuttering and staging material 4. Planning and allocation of materials/labour/plant & machinery for formwork activities in coordination with concerned persons at site. 5. Educating sub-contractor on system formwork. 6. Making mock-up of various system formwork. 7. Periodical reconciliation of formwork materials 8. Preparing FW schedule (requirement/release) within the ACE provision and sending the same to cluster office. 9. Preparing stock statement of formwork materials both in units and in nos. with area of shuttering done category wise/Plywood/Timber procured during the quarter/till date and productivity report. 10.Maintain close interaction with stores and site people for proper accounting of materials. 11.Dispatch and receipt notes to be sent to cluster office in the regular basis. 12.Making of purchase requisition for plywood and timber after thoroughly analyzing the number of repetitions. 13.Receipt of plywood/formwork materials to be acknowledged after quality checks to cluster office on monthly basis. 14.100% materials reconciliation at the end of the job. 15.Looking after pre-dispatch maintenance. 16.Ensuring that dispatched materials are in usable condition. 17.Sending monthly reports to cluster office.

ROLES & RESPONSIBITY OF SITE FOREMAN/CHARGEHANDS 1. Material accountability right from the materials receipts at site to dispatch to other site after completion of the job. 2. Small items have to be issued to the subcontractors form the stores and make them responsible for those items. For their sake, tool-box can b e issued. These items have to reconcile after completion of the job. 3. Ensure the Proper utilization of the formwork materials and avoid the misuse & wastage of particularly H-Beam and Bracing. 4. Ensure proper housekeeping at site as well as the maintenance (greasing/oiling after De shuttering etc.) of the formwork materials. 22

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5. De-shuttering in right time to achieve maximum number of repetitions of formwork materials. 6. Optimum use of screws & Accessories of formwork. 7. Quality in works carried out at site so that the tolerance should be within the tolerance limit. 8. Formwork labour productivity should be monitored closely to achieve the management goal. 9. Training of labour and sub-contractor workmen at site either by mockup or classroom programme by drawing sketches. 10.Adoption of safety standards while working by fully equipped with PPE and using the complete system at site (do not miss any bracing/connecting pin/locking pin etc.). 11.Use of stacking pallets

STANDARD ALLOWABLE DEVIATION AS PER IS 456:2000 The tolerances on the shapes, lines and dimensions shown in the drawing shall be within the limits given below as per IS 456:2000 a) Deviation from dimensions of footings

+ 12 mm - 6mm

1) Dimensions in plan

+ 5omm - 12 mm 0.02 times the width of the footing in the direction of deviation but not more than 50mm + 0.05 times the specified thickness

2) Eccentricity

3) Thickness

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L&T FORMWORK –  HAND TOOLS

.

WORK BENCH

MEASURING TAPE

CLAW HAMMER

CHISEL

PLUMB BOB

TUBE LEVEL

AUGUR

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SCREW BAR

ADJUSTABLE SCREW SPANNER

TRY SQUARE

LINE THREAD

DOUBLE END SPANNER

HAND SAW

SPIRIT LEVEL

RING SPANNER

HAND PLANNER

TWO WAY RATCHET

PLYWOOD TRY SQUARE ( BIG)

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L&T FORMWORK – MACHINERY & POWER TOOLS

TABLE PLANNER

CIRCULAR SAW CUTTING MACHINE

ELECTRIC SCREW DRIVER & BITS

HAND SAW CUTTING MACHINE

DRILLING MACHINE UPTO 13.5 MM

JIG SAW

DOUBLE END SPANNER

HEAVYDUTY DRILLING MACHINE

RING SPANNER

( HSS ) DRILL BIT WOODEN FLAT DRILL BITS CONCERETE DRILL BITS

HAND PLANNER (ELECTRIC)

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HEAVY-DUTY HSS DRILL BITS

COUNTER SUNK DRILL BITS

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DO’S & DON’T’S

Flex system: 

Use tripods only where the H-beams are lapping and at the ends.

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All the legs of the tripods to rest on firm ground.

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Props to rest on the ground firmly and should be compacted.

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Ensure sufficient lap of H-beam in primary & as well as in secondary.

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Ensure the Correct spacing of H-beam & Props. According to FW design (FW Scheme drawing).

Cup Lock system: Ensure 

Ground should be fully compacted and uniform.

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All the horizontal bracings should be in position.

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Bracings between towers / tower and permanent structure, required at four times the minimum width of scaffold in height.

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Adjustable screw jack with base plates and adjustable screw jack with U-head are provided at the bottom and top of vertical leg respectively.

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Cup lock should be straight/vertical

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40mm thick Timber plank as compression strut

 Angle should not be less than 60º

Normal Lifting Position

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STACKING (Housekeeping) Stack the materials properly when not in use & protect them. It helps…… In easy reconciliation Faster retrieval of material & reconciliation. Better space management Improves work culture Avoids wasteful expenditure Safety- prevention & loss of material Protection to materials- improves life of materials Enables easy maintenance

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Water jet for efficient cleaning of shutter panels:

Application Area Removal of rust, markings and concrete from plywood & steel surfaces. Remove lime scale deposits and marine growth. Deck cleaning. Dust free sand blasting. USEFUL Easy and fast removal of dust particles, rust and plastic papers.  •

• •

•

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Shuttering oil sprayer machine :

Shuttering oil sprayer machine can be used for easy application of shuttering oil on both horizontal and vertical shuttering panels. It sprays oil when compression pressure is maintained by  pumping. It is easy handling for workers; they can hold it in hand or hang on their back.

Benefits:    

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Better productivity (saving cost and time) Less wastage  No separate rollers/brushes, containers required. Protect shuttering plywood from damage as in case of conventional application method.

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FORMWORK SAFETY: Inbuilt safety features in L&T System Formwork Flex System

Clear passage for workmen & inspection, self-standing with tripods . Beam Forming Support Safe and easy fixing removal mechanism, no loose components. Column Wall /Formwork system

Walkway Passage for tying of reinforcement, concreting & vibrating. Lifting hooks for mechanical handling, double nut props for alignment in both directions. Cup Lock System

Simple connections- no loose components, easy vertical alignment on uneven ground also, self-locking pins. Stair Tower System

 Access to heights up to 100 m with adequate tying to structure at 6.0 m. Handrail at all locations, Regular and comfortable risers, Uniform Head room, Proper arrangement of landing at regular intervals, Multiple entry possible on sides of buildings  .

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SCAFFOLD Tag system

This should be installed by the Safety persons after inspected by the formwork Engineers & safety authority together.

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Columnstaging arrangement

• • • •

Proper access Guard rails Intermediate Landing Workmen equipped with all required Personal Protective equipment.

Safety Net provided to protect from fall of workman & Material 35

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Workers working with their safety belts connected to horizontal life line. They are protected from fall even while moving from place to place.

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Approach walkway

Flex System 

All the main props should be fitted with folding tripod

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Do not use tor steel in place of locking pin in CT Prop.

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In ground level work, proper earth compacted and necessary bearing below the prop should be done.

Do not use Reinforcement instead of locking pin

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Working Platform

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Working Platform 

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Every work-platform shall be provided with guardrails as shown. Height of the guardrail shall be from 900mm to 1200mm. Intermediate guardrail and toe-board are provided. Height of toe-board is minimum 100mm. Scaffold boards should be well secured without any play. Work-platform shall be provided with proper access, like a ladder secured to the scaffold.

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Floor Openings • Cover the openings • Provide guard rails • Safety net with fishing net to trap falling materials • Provide toe-guard to prevent materials falling through openings

Guarded Edge

Unprotected sides and edges must have guardrails or equivalent 40

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L&T Construction

Access to Work Platform LADDER

1.Ladder shall be of sound quality usable in construction having rungs equally placed. 2.Ladder shall be secured to the scaffold as shown. 3.Ladder shall be extended at least 1m above the work-platform. 4. Horizontal distance between the base of the ladder and the work-platform shall be ¼ of the height of the work-platform. 5. Length of ladder should not be more than 10m

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SOP –DLF Capital Greens Released by :- Formwork Dept., RB&F, DLCL

L&T Construction

Safe Access  –  for the Concreting of wall / Column with the help of brackets & NB i e

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SOP –DLF Capital Greens Released by :- Formwork Dept., RB&F, DLCL

L&T Construction

Dismantling of Scaffold 1. Cordon off the area and deploy

only experienced men. Provide Red Tag 2. Start dismantling from top. 3. Each tier shall be completely dismantled and the material lowered to the ground before beginning to dismantle the next tier. 4. Use Derrick and Pulley for lowering materials if at heights. 5. While removing jammed or rusted scaffold components, anchoring safety belt is essential. 6. At the end of the day, if a scaffold is going to be left halfdismantled, it is essential to lower all the loose scaffold materials down and ensure that the scaffold is braced adequately to the building.

43

SOP –DLF Capital Greens Released by :- Formwork Dept., RB&F, DLCL

L&T Construction

Improperly covered Floor Openings

 Cover

pletely securely

comand



If no cover, should guard with a guardrail

This opening could be made safe by using a guardrail, or strong cover 44

SOP –DLF Capital Greens Released by :- Formwork Dept., RB&F, DLCL

L&T Construction

 Accident Prevention 1. 2. 3. 4.

Elimination of unsafe acts and conditions Inclusion of Safety Aspects in the design itself Integrating Safety into Systems & Work Methods Should Confirm the Scheme drawing before doing any formwork  Activity in site. 

 



Proper Slinging and Rigging Practices should be followed while lifting the formwork assembly. Strength and Location of lifting hooks should be checked. No loose materials should be kept on the formwork panels or top platforms. Panels should be pre-checked before lifting

Safe Design 

 Adequate Factor of Safety for Formwork System and individual Components  Components can be inspected easily to check design adequacy and acceptance criteria  Consideration of concrete pressure and rate of pouring in formwork design  Formwork System is self-aligning and self-standing  Easy to fasten accessories  System integrated aligning and bracings    

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Work-platform with handrails for the works at heights Integrated climbing arrangements Study components which are light in weight for easier handling System-integrated handles / lifting hooks for easier handling

SOP –DLF Capital Greens Released by :- Formwork Dept., RB&F, DLCL

L&T Construction

Slab & Beam striking time as per the IS 456 Re-propping has to do if early striking of formwork. For re-propping has to follow the scheme drawing & design criteria.

46

SOP –DLF Capital Greens Released by :- Formwork Dept., RB&F, DLCL

L&T Construction

CHECK LIST FOR L & T FORMWORK SYSTEM Tolerances : Dimensions = ( + or - ) - 1 mm , Plumb = ( + or - )-1 mm & Level = ( + or - ) - 5mm. SL .

Allowable

DESCIRIPITION

NO

Tolerance

OK

NOT OK

REMARKS

Wall / Column Formwork System 1

Verticality ( plumb )

2

Tightening of tie rods

3

Tie rod Tube inner dia. 22 mm Thickness of tube

- 2.5 mm

4

Tie rod tube both end using of tie rod cone

5

maintain of wall thickness timber spacer to be fixed at top level

6

Wall Thickness checked

7

Compression strut in Shutter panel top

8

protective Timber planks @ Shutter panel bottom

9

Connection of H-beam With steel waler

Every Joint with

2" thk planks

Using of

m6 bolts

SLAB ( Flex system ) 1

All the main props should be fitted with folding tripod ( H - Beam lapping location )

2

All intermediate prop should be fitted with four way head ( or ) supporting bracket

3

Locking pin For Props ( No Alternative to be use )

4

Verticality of props

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SOP –DLF Capital Greens Released by :- Formwork Dept., RB&F, DLCL

L&T Construction