Monday, April 7, 2008

Work Methos statement for water proofing

WORKS METHOD STATEMENT

WATER PROOFING MEMBRANE AT LEVEL 7 BASED ON SITE CONDITION

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 submission explains the method of construction to be adopted for the installation of water proofing membrane system based on the current site condition at level seven.

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-030 for the procurement procedures.
5.0 RESOURCE PROVISIONS

5.1 Manpower/Labour

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

5.2 Plant Equipment

Typical plant equipment to be used shall consist of:

~ Propane gas torch with related glass cylinder
~ Knife
~ Trowel a rounded tip
~ Protective gloves and googles





6.0 LOGISTICS PROVISIONS

Not applicable

7.0 MATERIAL MANAGEMENT SYSTEMS

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

8.0 CONSTRUCTION METHODS AND TECHNOLOGY

8.1 Work Sequence

The area to install the water proofing membrane will be carried out in three (3) stages:
a) Perimeter of plant room
b) Inside plant room
The installation of the water proofing membrane will be divided into two (2) areas i.e. area A (gridline A to D1) and area B (gridline D1 to H).
c) In between the zone (Main, South and North atrium)

Furthermore the sequence of work to install the water proofing membrane will have to consider the fact that other trades material and equipment had being installed on site. More over there is still outstanding works by other trades still in progress.

8.2 Additional Works To Be Carried Out

8.2.1 Concrete encasement / haunch for all the RWDP.

Due to insufficient clearance between the bottom of pipe and the top of structural concrete slab (refer attached photos). The water proofing membrane will not be able to be lay below the RWDP. Therefore the RWDP need to be encased / haunch with concrete in order for the water proofing membrane to be terminate on top of the concrete encasement / haunch. (Refer to attached shop drawing.)

Since the purpose of the concrete is only to encased / haunch the RWDP (non structural) we proposed to use mass concrete to carry out the works.

8.2.2 Enlargement of plinth (between steel structure column and M&E plinth)

Due to the position of steel structure plinth and M&E plinth (refer to attached photo). It is necessary to enlarge the require plinth in order to ensure the water proofing membrane will be properly terminate on top of the plinth. (Refer to attached shop drawing)


Since the purpose of the concrete is only to enlarge the existing plinth (non structural) we proposed to use mass concrete to carry out the works.

8.2.3 Kerb (Brick) Around All M&E Opening

Besides the risers (mechanical and electrical), which is already being design to be closed with brick wall. Kerb need to be install at all M&E opening that penetrate the level 7 slab i.e.: air-cond duct (refer to attached photo) to ensure the termination of the water proofing membrane will be achieve.

In order to achieve the requirement, we propose to construct the kerb by using brick (150mm x 200mm high) and plaster on both sides.

With the brick install, the water proofing membrane will be terminated on top of the kerb. (Refer to attached shop drawing)

8.2.4 Concrete Surround / Kerb for M&E Equipment Not Sitting On Plinth

1. Switch board. (Refer attached photo)
Kerb, using brick and plaster on both sides (150mm x 200mm high) will be install around this equipment to ensure the termination of the water proofing membrane will be achieve. (Refer attached shop drawing)

2. Silencer. (Refer to attached photo)
Concrete surround (using mass concrete) will be form around the support of the silencer. The size of the concrete surround is to match the water proofing membrane requirement. (Refer attached drawing).

8.3 Protection To The M&E Equipment

Prior to installation of the water proofing membrane all the M&E equipment need to be protect from any foreign material i.e. dust, water etc.

The method of protection to be apply to the equipment will be either
a) Wrap a layer of plastic / canvas sheet around the equipment. (refer attached photo)
b) Fix 3mm plywood around the equipment (switch board). (refer attached photo)

8.4 Conclusion

With regard to the current site condition, all the additional works mentioned above need to be carry out properly prior to the installation of the water proofing membrane. Furthermore, all slab surface preparation (refer document no: PHOS/ARC/---/CTS/KPB/499) also need to be complete prior to the installation of the water proofing membrane.



9.0 CONSTRUCTION PHASING AND WORKFLOW

Not applicable

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.

12.0 QUALITY ASSURANCE AND CONTROL PROGRAMMES

Please refer to Appendix 15.5 for the Inspection and Test Plan and Appendix 15.3 for the Checklist.

13.0 INDUSTRIAL RELATIONS POLICIES

Not Applicable

14.0 ENVIRONMENTAL MONITORING PROGRAMMES

Please refer to PHOS-EMP-001 Environmental Management Plan

15.0 APPENDICES

15.1 Coordination drawing level 7 (Typical details)
15.2 Photos of current site condition and method to protect the M&E Equipment
15.3 Inspection Checklist
15.4 Job Safety Analysis
15.5 Inspection And Test Plan

1 comment:

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