Method Statement for Plunge Column

CEC - UG1B

CONTRACT: ICB No. :-JP/EW/1B/C1

JAIPUR METRO RAIL CORPORATION LIMITED

METHOD STATEMENT FOR CONSTRUCTION OF PLUNGE COLUMN IN STATION DOC NO: PR/JMRC/MS/UG1B/PHOF/14-R0

CONTRACT UG1B

PROJECT: Design and Construction of Tunnel between Chand Pole and Badi Chouper and reversal line by Shield TBM, Underground Metro Stations at Choti Chouper & Badi Chouper by Cut & Cover Method on East-West Corridor of Jaipur Metro (Phase 1B) at Jaipur, Rajasthan, India.

LOCATION: JAIPUR

METHOD OF STATEMENT FOR CONSTRUCTION OF PLUNGE COLUMN IN STATION

Page 1

CEC - UG1B

Project Manager RV AKASH GANGA INFRASTRU CTURE Constructio n Pvt. Ltd.

CONTRACT: ICB No. :-JP/EW/1B/C1

JAIPUR METRO RAIL CORPORATION LIMITED

METHOD STATEMENT FOR CONSTRUCTION OF PLUNGE COLUMN IN STATION DOC NO: PR/JMRC/MS/UG1B/PHOF/14-R0

CONTRACT UG1B

DGMPlanning Department ,

CEC

DPM STATION,

CEC

Senior Manager QA/QC Department ,

CEC

Chief Manager HSE Department ,

CEC

Project Leader

CEC

Table of Contents Sr. No. 1.0 2.0 3.0 4.0 4.1 4.2 5.0 6.0 7.0 7.1 7.2 7.3 7.4 7.5 7.6 7.7 7.8 7.9

Description Purpose Scope of Work Site Establishment & Setting Out Major Resources to be Deployed Equipment to be Deployed Manpower to be deployed Materials Responsibility and Authority Construction Procedure Traffic Management and Barricading SHE Measures Design & Drawings Site Establishment Surveying Pre Trench Plunge column boring Muck Disposal Preparation of Rebar Cage Page 2

Page No. 03 03 03 04 04 04 04 05 06 06 06 07 07 07 08 08 09 10

CEC - UG1B

7.10 8.0 9.0 10.0 11.0

CONTRACT: ICB No. :-JP/EW/1B/C1

JAIPUR METRO RAIL CORPORATION LIMITED

METHOD STATEMENT FOR CONSTRUCTION OF PLUNGE COLUMN IN STATION DOC NO: PR/JMRC/MS/UG1B/PHOF/14-R0

CONTRACT UG1B

Concreting Quality Control / Control Assurance Environmental Management Safety and Emergency Procedure Attachments

12 12 12 13 13

1.0 PURPOSE This Method Statement describes the construction process of 1500 mm diameter Plunge columns in station areas. 2.0

SCOPE OF WORK

The scope of work and the Construction Sequence for installation of permanent Plunge Column shall be as mentioned below: a. Traffic Management and Barricading b. SHE Measures. c.Design and Drawings d. Site Establishment e. Surveying f. Pre-excavation g. Boring into soil to the design depth h. Muck Removal Page 3

CEC - UG1B

CONTRACT: ICB No. :-JP/EW/1B/C1

JAIPUR METRO RAIL CORPORATION LIMITED

METHOD STATEMENT FOR CONSTRUCTION OF PLUNGE COLUMN IN STATION DOC NO: PR/JMRC/MS/UG1B/PHOF/14-R0

CONTRACT UG1B

i. Fabrication of structural steel flange column j. Cage preparation and cage lowering k.Tremie Lowering l. Concreting for Plunge Column m. Back filling 3.0 SITE ESTABLISHMENT & SETTING OUT Good firm access shall be provided to allow safe passage of plant and equipment throughout the Plunge Column construction area. Adequate, hard, all weather platforms shall be provided and maintained for the execution of the Plunge Column operations. Platforms shall provide sufficient bearing capacity for the pilling rig and cranes. Safety barriers shall be provided at all times to prevent unauthorised access to the operation area. The position of the Plunge Column shall be determined by the setting out as Per Drawing No.OKICPL-JM1B-C-SC-0475.

4.0 4.1

MAJOR RESOURCES TO BE DEPLOYED Equipment to be Deployed

1. 70 Ton capacity crawler crane

- 1 no

2. Supporting crane(70Ton)

- 1 no

3. Hydraulic self-propelled Kelly Rig

-1 no

4. Polymer setup

-1 unit

5. Tremie pipe (200 mm Dia; with hopper) 6. Welding set

-1 unit -4 no

7. Cutting and bending machine

-2 no Page 4

CEC - UG1B

CONTRACT: ICB No. :-JP/EW/1B/C1

JAIPUR METRO RAIL CORPORATION LIMITED

METHOD STATEMENT FOR CONSTRUCTION OF PLUNGE COLUMN IN STATION DOC NO: PR/JMRC/MS/UG1B/PHOF/14-R0

CONTRACT UG1B

8. Transit Mixer

- 8 no

9. Batching Plant (60 cum/hr)

- 1 no

4.2

Manpower to be deployed Sr. No.

Construction Manager

1

2

Site Engineer

2

3

QC Engineer (Field and Lab)

1

4

Mechanical Engineer

1

5

Surveyor

1

Foreman

1

7

Supervisor

4

8

Electrician

2

9

Safety Officer

2

Mechanic

2

10

  

MATERIALS Concrete as per Approved mix design M35 Grade. Reinforcement – Steel conforming to specification Polymer (from approved supplier)

6.0 6.1

Number

1

6

5.0

Category

RESPONSIBILITY AND AUTHORITY

DPM-Stations

• He shall be overall responsible for following o Safety Rules o Statutory Compliances Page 5

CEC - UG1B

CONTRACT: ICB No. :-JP/EW/1B/C1

JAIPUR METRO RAIL CORPORATION LIMITED

METHOD STATEMENT FOR CONSTRUCTION OF PLUNGE COLUMN IN STATION DOC NO: PR/JMRC/MS/UG1B/PHOF/14-R0

CONTRACT UG1B

o Quality Manuals o Construction Methodology • Overall responsible for the whole operation. 6.2

Station Manager

• He shall be overall responsible for the whole procurement of Men, Material and Machinery at site, including operation planning and adhered with works program. He shall be liaison with Utility Owning Agency for approval of Utilities Diversion Plans (if any). 6.3 • • • • • • •

6.4 

Site Engineer Responsible for site operation. Material and equipment planning. Ensure works are carried out in accordance with the method statement. Ensure works follow approved drawings and specification. Ensure works are carried out in a safe manner. Field control and supervise all site activities. Apply and issue relevant work permits.

Design Engineer He shall be responsible to issue controlled copies of all drawings to the site personnel and return back all obsolete copies. He shall provide detailed design specifications to carry out the work.

6.5 

Planning Engineer He Shall be Responsible for arrangement of all external resources

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CEC - UG1B

6.6  

6.7   

CONTRACT: ICB No. :-JP/EW/1B/C1

JAIPUR METRO RAIL CORPORATION LIMITED

METHOD STATEMENT FOR CONSTRUCTION OF PLUNGE COLUMN IN STATION DOC NO: PR/JMRC/MS/UG1B/PHOF/14-R0

CONTRACT UG1B

Safety Personnel Ensure works are carried out in a safe manner and in accordance with the safety requirements stipulated in the SHE plan. Conduct tool box talks on the safety requirements, construction risks and its control measures etc. Surveyor Carry out setting up works and locate as per submission drawings. Carry out inspection for location and level of structure. Keep monitoring the movement of ground and structure.

6.8   

7.

QC Engineer Ensure works are carried out in accordance with specification. Carry out inspection for all activities in accordance with the Inspection and Test plan. He shall be responsible to prepare the method statement in co-ordination with Design, Safety & Quality and enclose Inspection and Test Plan and risk assessment. He shall review the method statement as per site requirement.

CONSTRUCTION PROCEDURE 7.1 Traffic Management and Barricading Traffic management shall be carried out as per the approved Traffic Diversion Plan. For heavy equipment mobilization, necessary precautions shall be taken to bring the required items within the work area boundary by carefully managing the traffic. The work location shall be barricaded as per the site requirement and all the equipment shall be installed inside barricaded area.

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CEC - UG1B

7.2

CONTRACT: ICB No. :-JP/EW/1B/C1

JAIPUR METRO RAIL CORPORATION LIMITED

METHOD STATEMENT FOR CONSTRUCTION OF PLUNGE COLUMN IN STATION DOC NO: PR/JMRC/MS/UG1B/PHOF/14-R0

CONTRACT UG1B

SHE Measures

1) All the workers shall be provided with required PPE (safety jacket, shoes, helmet, hand gloves etc.) before they are engaged in the work. 2) Safety induction shall be provided to the supervisors, engineers and workers. 3) Tool box meetings shall be organized every day by site supervisor before start of work in order to keep workers aware of associated risks and safe working in order to avoid accidents/injuries. 4) Unauthorized/outsiders shall not be allowed to enter inside/stay near the area barricaded during work in progress. 5) First aid facilities shall be made available at site and male nurse shall be available at principal work spot to render the first aid services, if so required. 6) Proper Lighting arrangement shall be maintained during night work (or in day time in case of low visibility). 7) Housekeeping shall be maintained at work spot to avoid any undesirable incident. 8) Emergency contact number shall be available and displayed at the designated locations near the work spot to tackle any emergency situation occurring at site. 9) All the machines shall be inspected before deploying to the work and proper guarding for moving parts Shall be in place prior to commencement of work. Operators with valid licence (where applicable) shall be allowed. 10) Silent type DG sets shall be deployed at work location. 11) Drip tray shall be provided underneath the machineries to avoid land contaminations. 12) Dust bins shall be available at prominent locations of work site to collect generated waste out of site activities. 13) Risk assessment shall be discussed among all concerned prior to start of the activity. 14) After completion of work at a particular stretch required back filling shall be taken up depending upon site requirement. 15) After completion of work post inspection shall be carried out to ensure that the tidiness has been maintained and the work location has been restored to Page 8

CEC - UG1B

CONTRACT: ICB No. :-JP/EW/1B/C1

JAIPUR METRO RAIL CORPORATION LIMITED

METHOD STATEMENT FOR CONSTRUCTION OF PLUNGE COLUMN IN STATION DOC NO: PR/JMRC/MS/UG1B/PHOF/14-R0

CONTRACT UG1B

original condition. 7.3 Design & Drawings A. The work shall be carried out as per the approved design and drawing. B. Controlled copies of relevant drawings shall be made available at site and shall remain available with site engineer throughout the work. 7.4

Site Establishment

Before starting any activities, a site utilization plan is drawn showing the various establishments at site such as location of Panel formation, Putting DG’s, Polymer tanks, Muck bin, office etc. through a detailed survey. The site area shall be then cleaned properly and made free from any on and over ground obstruction and necessary barricading shall be installed. All plant and equipment shall be placed as per this plan. 7.5 Surveying Upon clearing the site area, the setting outpoints shall be marked for the subjected Plunge Column panel and with reference to that guide wall, points shall be marked through requisite survey. Reference pillars shall be always preserved for checking of constructed guide wall at later stage. All the survey points/coordinates shall be maintained in survey sheet and checked/approved by Engineer prior to construction work. 7.6 Pre Trench During this pre excavation process, investigation and verification of underground utilities shall be done at the subjected location. Manual excavation shall be done for finding the underground utilities. In case of any utilities found, the mapping shall be done through requisite survey and a drawing shall be drawn. In order to construct the Plunge Column such utilities if required to be shifted marginally, the same shall be done either through local shifting or providing the local diversion as agreed upon by the utility owner. The diversion Page 9

CEC - UG1B

CONTRACT: ICB No. :-JP/EW/1B/C1

JAIPUR METRO RAIL CORPORATION LIMITED

METHOD STATEMENT FOR CONSTRUCTION OF PLUNGE COLUMN IN STATION DOC NO: PR/JMRC/MS/UG1B/PHOF/14-R0

CONTRACT UG1B

process if necessary shall be done in consultation with utility owner. Utility diversion shall be done as per Approved Method Statement. The utility diversion method statement shall provide detailed information about the underlying utilities and the process to be followed for the diversion process. 7.7

Plunge Column Boring (a)Boring of Soil 1.5 meter dia; Boring of soil shall be carried out using a rotary Hydraulic pilling rig in normal soil strata to the required depth as Per Drawing No.OKICPL-JM1B-C-SC-C-0411.Soil stabilization will be ensure by polymer final depth of concrete shall be confirmed by sounding method. The verticality of the Bore shall be monitor during installation and letter check before lowering of cage. The eccentricity shall be jointly done with verticality.

(b)Setting out of guide frame Minimum 200mm trench shall be excavated, a levelling PCC (M15/M20) will laid for placing the guide frame as per the Drawing attached. (c)Placing of Guide frame After placing of PCC guide frame shall be placed carefully in line and level layout as per the surveyor. (d)Instillation of temporary casing To stabilize the upper bore, temporary steel casing of length 2.5 m shall be installed at the bored pile locations as follows: A 1500mm Dia bore shall be drilled using a Hydraulic Boring machine to a required depth. A 2.5m long steel casing shall be installed in the 3-4m deep bore holed by Page 10

CEC - UG1B

CONTRACT: ICB No. :-JP/EW/1B/C1

JAIPUR METRO RAIL CORPORATION LIMITED

METHOD STATEMENT FOR CONSTRUCTION OF PLUNGE COLUMN IN STATION DOC NO: PR/JMRC/MS/UG1B/PHOF/14-R0

CONTRACT UG1B

lowering the Casing with crane. Vertically shall be checked and ensured during installation. The casing shall then be driven into the ground with rotary machine until about 300 mm is left protruding above the ground. Drilling rig is then used to progress the excavation to the bottom of the casing pipe and then polymer shall be added before any further excavation is made. During excavation polymer shall be added continually from the storage tank such that level is maintained with in 1000mm below top of casing pipe. Excavation depth shall be found by sounding tape. (e)Polymer Slurry Preparation, Storage and circulation Dry polymer powder shall be tested and approved prior to the use. The batching plant shall be erected on adequate impermeable slab. Dry polymer powder shall be mixed in the mixing tank with the water. The mixing shall be achieved by dedicating a pump and compressed air system. The mixing tank capacity may be 1.5 times the excavation's volume. The mixing tank shall be connected to the slurry storage tank with appropriate routing valves. Thus polymer slurry is made ready for use with required properties. In the second phase the polymer slurry shall be pumped to the trench and circulated continuously till excavation is over. While the panel excavation is going on the polymer slurry continuously flows to the trench and thus stabilizes the trench throughout its depth. While excavation, the polymer slurry get mixed with soil and loses its properties. Continuous circulation of fresh polymer shall help to keep the properties of the polymer slurry even then it is mixed with the soil. The return slurry shall be pumped into the sedimentation tank. The sedimentation tank shall be kept open to the top to allow an easy cleaning and removal of sediments. As sedimentation tank is included with three deflector vertical plates, continuous flow of slurry Page 11

CEC - UG1B

CONTRACT: ICB No. :-JP/EW/1B/C1

JAIPUR METRO RAIL CORPORATION LIMITED

METHOD STATEMENT FOR CONSTRUCTION OF PLUNGE COLUMN IN STATION DOC NO: PR/JMRC/MS/UG1B/PHOF/14-R0

CONTRACT UG1B

shall occur in "cascade" like mode and increase the speed of the sedimentation occurring between different compartments. The final de sanded slurry shall be connected to the storage tank with after being treated properly to achieved required property and sent to storage tank with proper pumping arrangement.

(Details of Polymer Batching Plant mix is shown in Annexure - B)The polymer characteristics shall be checked with respect to the following prescribed values: Permissible Value Sr. Test Prior to No. Fresh mix Reused Slurry concrete pour Density 1.00 to 1 ≤ 1.06 ≤1.05 (kg/m3) 1.04 2 pH Value 11 to 12 11 to 12 9-12 Marsh Cone 3 55-140 55-140 50-140 Viscosity API (s) Sand Content 4