WMS Road

WORKS METHOD STATEMENT

ROAD WORK
TABLE OF CONTENTS


1.0 INTRODUCTION
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 Work Method Statement is to outline the apply and lay pavement for the road construction consisting 75 mm quarry dust/sand sub – base, 300 mm thick crusher run base, 50 mm asphaltic concrete binder course and 40 mm asphaltic wearing course.

2.0 DESIGN CONSTRAINT
- Nil

3.0 CONTRACTING METHOD
The Condition of Contract has been reviewed by PCSB and particularly those conditions in respect of Sub-PCSBs. The conditions are bespoke for this project and therefore be required to be reflected in any form of Sub-contract utilized on the project.

4.0 PROCUREMENT METHODS
Since PCSB is liable for performance of any subcontractor, it is vital that only companies with proven track records in the relevant activity will be engaged as subcontractor.

It is acknowledge that before any part of the work can be sublet, the approval of the employer’s representative is required.

Refer to PHOS-CN-010 to PHOS-CN-030 for the contract procedure

5.0 RESOURCE PROVISIONS
5.1 Manpower / Labour
The number of manpower/labour to be used during the installation activities shall be identified in the Manpower record.


5.2 Plant Equipment / Machinery
- Hydraulic excavator EX 200
- Ford 500 back pusher
- Dynapac CA 25 vibratory roller
- Dynapac CC21 vibratory tandem roller
- Dynapac WP20 pneumatic tyred roller
- Technics self propelled bitumen distributor
- Vogele super 1502 asphalt paver

6.0 LOGISTICS PROVISION
The logistic control shall be accordance with the approved Site Logistic Plan

7.0 MATERIAL MANAGEMENT SYSTEMS
Refer to PHOS-CP-040 for Material Control Procedure

8.0 CONSTRUCTION METHODS AND TECHNOLOGY

8.1 The Construction Base
• Works shall commence on accepted and approved area of sub grade
• Approved sub base materials shall be delivered to site by tippers trucks
• Laying and spreading in full width of the sub base material shall be carried out using back pushers or other approved mechanical plant.
• Compaction using vibratory roller or vibratory compactor after spreading in a single layer
• The surface of the sub base shall be finished to the grade and line required by the drawings.



8.2 The Construction Road Base
• Works shall commence on site upon approval and acceptance of the sub base layer.
• Approved road base materials shall be delivered to site by tipper trucks.
• Laying and spreading in full width of the road base materials shall be carried out using back pushers and motor grader or other approved mechanical plant.
• Compaction using vibratory roller shall commence when the moisture content is + 3.0 % of the optimum value. Compaction shall be carried out in a single layer.
• The surface of the road base shall be finished to the grade and line as required by the drawings.
• Compaction requirement – method of compaction to achieve not less than 95% of the maximum dry density as determined by BS 1377 test 13 (4.5 kg rammer method).

8.3 Spraying Prime Coat

• Works shall commence on site upon approval and acceptance of the road base layer.
• The surface to receive the prime coat (SS1–K) shall be free from all loose material and standing water.
• The approved prime coat (SS1-K) shall be sprayed by bitumen emulsion self propelled.
• The rate for spreading the prime coat shall be 0.8 to 1.2 litres/m2



8.4 Construction of Asphaltic Concrete Binder Course
• Works shall commence on site upon approval and acceptance of the base course sprayed with prime coat.
• The surface to receive the asphaltic binder course shall be plant mixer (paving plant and process continuous drum mixer) with bitumen content as established in the job standard mixture.
• The approved asphaltic concrete binder course shall be delivered to site by tipper trucks. To prevent the loss of heat, the mixture shall be covered by tarpaulin.
• The asphaltic concrete binder course shall be laid by Vogele super 1502 paver or equivalent in the single layer.
• If the laid surface in open textured, back casting shall be carried out and the bigger size aggregates removed before rolling.
• At the end of the paving operation, the transverse joint shall be feathered down. Vertical join shall be providing for the operation of paving.
• Compaction shall be carried out using the specific/equivalent type of compactors as stated in the road work specification :
1. Dynapac CC21 Vibratory Tandem roller
2. Dynapac WP20 Pneumatic Tyred roller
3. Technics self propelled bitumen distributor
4. Vogele super 1502 asphalt paver
• Rolling shall be always commencing from the lower to the higher side of the carriageway. The minimum rolling temperature shall be 120 degree Celsius.
• The surface of the asphaltic concrete binder course shall be finished to the grade and line as required by the drawing.
• Compaction requirement – method of compaction to achieved field density of not less than 98% of the Marshall density of the job standard mixture or as per specification.

8.5 Spraying Tack Coat
• Works shall commence on site upon approval and acceptance of the asphaltic concrete binder course.
• The surface to receive the tack coat (K1-40) shall be free from all loose material and standing water.
• The approved tack coat (K1-40) will be sprayed by bitumen emulsion self propelled.

8.6 Construction of Asphaltic Concrete Wearing Course
• Works shall commence on site upon approval and acceptance of the asphaltic concrete binder course sprayed with tack coat.
• The surface to receive the asphaltic concrete wearing course shall be freed of all dirt, loose materials and standing water by sweeping.
• The asphaltic concrete wearing course shall be plant mixer (paving palnt and processes continuous drum mixer) with bitumen content as established in the job standard mixture.
• The approved asphaltic concrete wearing shall be delivered to site by tipper trucks. To prevent the loss of hear, the mixture shall be covered by tarpaulin.
• The asphaltic concrete wearing course shall be laid by vogele super 1502 paver or equivalent in single layer.
• If the laid surface in open textured, back casting shall be carried out and the bigger size aggregates removed before rolling.
• At the end of the paving operation, the trasverse joint shall be feathered down. Vertical joint shall be providing for the operation of paving.

• Compaction shall be carried out using the specified/equivalent type of compactors and the rolling pattern shall be as per established during the trial lay.
• Rolling shall be always commence from the lower to the higher side of the crriageaway. The minimum rolling temperature shall be 120 degree Celsius.
• The surface of the the asphaltic concrete wearing course shall be finished to the grade and line as required by the drawing.
• Compaction requirement – method of compaction to achieve field density of not less than 98% of the Marshall density of the job standard mixture or as per specification.

8.7 California Bearing Ratio (CBR)
• The CBR test equipment was set up on the selected location.
• Load was applied penetratively into location by constant rate.
• The readings of the proving ring from 0 mm to 7.5 mm penetration were then recorded.
• A force versus penetration curve was the plotted.
• CBR at 2.5 mm and 5.0 mm penetration were then calculated out from plot.
• The CBR of the location were then taken from the large value either 2.5 mm or 5.0 mm.

9.0 CONSTRUCTION PHASING AND WORKFLOW
The phase on installation works is included in the Master Programmed.






10.0 TRAFFIC MANAGEMENT AND MONITORING
Make sure no obstruction to site traffic flow. Logistic and safety department will monitor closely

11.0 SAFETY PROGRAMME
11.1 Safety Hoarding, Temporary Works and Public Safety
The Logistic Manager shall be responsible for submission of plans and drawings to the relevant

The Logistic Manager shall provide adequate signboards at all strategic positions warning the public to keep away from the work site and erect temporary fencing and barriers where necessary around the site to prevent unauthorized trespassing during works.
11.2 Personal Safety
The HSSE Manager shall be responsible to take necessary measures to ensure that workers are constantly in safe working condition.

12.0 QUALITY ASSURANCE AND CONTROL PROGRAMMES
Please refer to appendix 15.1 for inspection test plan and appendix 15.2 for inspection checklist.

13.0 INDUSTRIAL RELATIONS POLICIES
- Not Applicable

14.0 ENVIRONMENT MONITORING PROGRAMMES
Please refer to PHOS-EMP-001 Environment Management Plan




15.0 APPENDICES
Appendix 15.1 – Inspection Test Plan
Appendix 15.2 – Inspection Checklist
Appendix 15.3 – Job Safety Analysis