Monday, April 7, 2008

WMS Pile Cap

WORKS METHOD STATEMENT

PILE CAP WORKS



TABLE OF CONTENTS


1.0 WORK ORGANISATION
2.0 DESIGN CONSTRAINTS AND COORDINATION
3.0 CONTRACTING METHODS
4.0 PROCUREMENT METHODS
5.0 RESOURCE PROVISIONS
6.0 LOGISTICS PROVISIONS
7.0 MATERIAL MANAGEMENT SYSTEMS
8.0 CONSTRUCTION METHODS AND TECHNOLOGY
9.0 CONSTRUCTION PHASING AND WORKFLOW
10.0 TRAFFIC MANAGEMENT AND MONITORING
11.0 SAFETY PROGRAMME
12.0 QUALITY ASSURANCE AND CONTROL PROGRAMMES
13.0 INDUSTRIAL RELATIONS POLICIES
14.0 ENVIRONMENTAL MONITORING PROGRAMMES
15.0 APPENDICES



1.0 INTRODUCTION

This Method Statement is to be read in conjunction with the structural reinforced concrete method statement (PHOS/CnS/WMS/070) and checklists.

2.0 DESIGN CONSTRAINTS AND COORDINATION

Not Applicable.

3.0 CONTRACTING METHODS

Since PCSB is liable for the performance of any Sub-contractor, it is vital that only companies with proven track records in the relevant activity will be engaged as Sub -contractors.

It is acknowledged that before any part of the works can be sublet, the approval of the Employer’s Representative is required.

The Conditions of Contract have been reviewed by PCSB and particularly those conditions in respect of Sub-contractors. The conditions are bespoke for this project and therefore be required to be reflected in any form of Sub-contract utilized on the project.

Please refer to PHOS-CN-010 to PHOS-CN-030 for the Contract Procedures.

4.0 PROCUREMENT METHODS

Please refer to PHOS-PR-010 to PHOS-PR-060 for the procurement procedures.
5.0 RESOURCE PROVISIONS

5.1 Manpower/Labour

The number of manpower/labour to be used during the earthworks activities have been identified in the Manpower Histogram.

5.2 Plant Equipment

Please refer to structural reinforced concrete method statement (PHOS/CnS/WMS/070)

6.0 LOGISTICS PROVISIONS

The logistic control shall be in accordance with the approved Site Logistic Plan and includes wheel wash facilities and traffic management.



7.0 MATERIAL MANAGEMENT SYSTEMS

Please refer to PHOS-CP-040 for the Material Control Procedure.

8.0 CONSTRUCTION METHODS AND TECHNOLOGY

8.1 Pile cap excavation

Following the completion of earthworks to formation level and installation of main
pump sumps, the pile cap positions will be marked out by the survey team.

The pile cap will be excavated and compacted to approximately 125 mm below pile cut off level with a small sump formed (500 x 500 x 500 mm) in one corner and lean mix concrete laid (minimum 50 mm thick, grade 15). Any water ingress will be locally pumped from each pile cap into the main pump sumps formed in each zone. The collected water for the pile cap excavation is pumped to the site silt trap.


8.2 Pile cap construction

There will be two methods for pile construction.

1. If the ground is stiff enough, the pile cap will be excavated as accurately as possible to the pile cap dimension. Lean concrete will be placed on the base and sides and sump formed. No forms will be required.

The piles will then be cut down to cut off level and pile surface prepared as per specification (Pile cut off is 75 mm above base level). The base will be marked out by the surveyor and the reinforcement fixed. The reinforcement cage will be temporarily propped off of vertical concreted faces. These props will be removed as concreting of base progresses to ensure no movement of the reinforcement cage and column starter bars.

2. This method is similar to that described above except that the pile cap
excavation will be at least 1 m larger than the pile cap dimension to allow for
installation of formwork, and the requirement to backfill the pile cap after the forms have been removed.

Both methods are shown on the attached sketches.


9.0 CONSTRUCTION PHASING AND WORKFLOW

Following basement slab formatting superstructure will commence moving from grids 27/H towards 1/A, rising vertically in 4 zones.



10.0 TRAFFIC MANAGEMENT AND MONITORING

The Logistic Manager and the traffic management contractor shall be responsible for the management and control of the traffic in and out from the construction site.


11.0 SAFETY PROGRAMME

Please refer to PHOS-HS-010 Health and Safety Plan and Job Safety Analysis.


12.0 QUALITY ASSURANCE AND CONTROL PROGRAMMES

Please refer to structural reinforced concrete method statement (PHOS/CnS/WMS/070).


13.0 INDUSTRIAL RELATIONS POLICIES

Not Applicable


14.0 ENVIRONMENTAL MONITORING PROGRAMMES

Please refer to PHOS-EMP-001 Environmental Management Plan

15.0 APPENDICES

1. Pile cap work method (sketches)