Method Statement for Ultrasonic Pulse Velocity (UPV)

Work Methodology

Construction Procedure

1. Identify and mark test location.
2. Measure path length of test location.
3. Apply grease onto the concrete surface using scraper.
4. Calibrate the Pundit tester with calibration rod to 20.8 µs.
5. Start UPV test with putting transmitter onto the greased concrete surface and receiver onto the opposite side.
6. Record the transit time as displayed at the LCD of Pundit tester.
7. Repeat step 4 three (3) times to get another three (3) reading.
8. Pulse velocity was calculated by path length divided by average transit time thru the structure.
9. Contour graph shall be plotted using pulse velocity at each location on gridline.
10. Result analysis based on guideline from “Non-destructive Testing of Concrete” by Singapore Concrete Institute, 1995.

Method Statement for Pile Integrity Test (PIT)

Work Methodology

Materials

1. Not applicable

Plant and Equipment

1. PIT-Collector
2. Accelerometer
3. Rubber Tip Hammer

Manpower

1. Site Engineer
2. Site Supervisor
3. General Worker
4. Traffic Management Personnel

Construction Procedure

Traffic Management

1. All related signages and traffic devices need to be arranged on site before commencement of work on site. Please refer  to Traffic Management Plan.

Transportation (Mobilisation of Plants and Equipments)

1. During mobilisation of plants and equipments, proper traffic management need to be carried out and control. This is to ensure that the traffic was not affected by the movement of the mobilisation activities. The unloading of plants and equipments shall be done carefully.

Pile Head Preparation

1. The specialist engineer shall ensure that the pile head shall be clean, free from water, laitance, loose concrete, overspilled concrete and blinding concrete and be readily accessible for the purpose of testing.

Test Procedure

1. Request for Inspection (RFI) shall be submitted online not later than 5.00 pm or 24 hours before date and time of inspection to be conducted based on the Consultant working day (Monday to Saturday). RFIs on Sunday or Monday need to be submitted to the Consultant by Friday.
2. Low strain integrity testing should only be carried out on cast in-situ piles after (seven) 7 days or more from the date of pile casting unless otherwise approved.
3. The accelerometer (which is connected to the PIT-Collector) is attached onto the pile by an adhesive medium (vaseline or grease).
4. A handheld rubber tip hammer is impacted on to the pile top to generate a “low strain” compressive impact wave downward the pile.
5. The PIT-Collector will graphically display the velocity records.

Data Interpretation and Reporting

1. The interpretation of the test records shall be carried out by an engineer with at least three (3) years experience in dynamic pile testing. Major faults existing within the effective length shall be quickly identified and made known.
2. A full report shall be prepared within 7 days from the completion of testing.
3. The report shall include the plotted results and the specialist interpretation.

Method Statement for Sonic Logging Test

Work Methodology

References

1. Project Quality Plan(PQP)
2. Project Executive Plan (PEP)
3. Integrated Management System Manual (IMS)
4. Environmental Management Plan ((EMP)
5. Safety & Health Management Plan
6. Emergency& Response Plan (ERP)
7. Traffic Management Plan (TMP)
8. Survey Quality Plan (SQP)
9. Contract Specification
10. Approved Construction Drawing
11. Approved Shop Drawing
12. Other Related Method Statement

Materials

1. MS Pipes (minimum internal diameter of 50 mm)
2. Cement (OPC)

Plant and Equipment

1. Digital data acquisition equipment (PDI Cross-Hole Analyzer, CHA)

Manpower

1. Site Engineer/Site Supervisor
2. Traffic Controller
3. General Worker

Construction Procedure

Traffic Management

1. All related signages and traffic devices need to be arranged on site before commencement of work on site. Please refer to Traffic Management Plan.

Transportation (Mobilisation of Plants and Equipments)

1. During mobilisation of plants and equipments, proper traffic management need to be carried out and controlled. This is to ensure that the traffic will not affected by the movement of the mobilisation activities. The unloading of plants and equipments shall be done carefully.

Pile Preparation

1. The Main Contractor shall ensure that 50mm MS pipe for probes are installed in accordance to the engineer’s specifications during pile casting.
2. The tubes should be properly connected by welding and capped to prevent any foreign material from falling in. There should be tied to the steel bars and about 100mm to 200 mm above the pile toe all the way to the top of pile.

Test Procedure

1. Request for Inspection (RFI) shall be submitted online not later than 5.00 pm or 24 hours before date and time of inspection to be conducted based on the Consultant working day (Monday to Saturday). RFIs on Sunday and/or Monday need to be submitted to the Consultant by Friday.
2. Sonic Logging should only be carried out on cast in-situ piles after seven (7) days or more from the date of pile casting unless otherwise allowed and/or instructed. This is to allow the concrete time to cure.
3. The cap is removed prior to testing and filled with clean water. The emitter and receiver probes are lowered to the respective tubes to be logged. They are then raised simultaneously up the tubes. Logging can also be done top down. The pulse generated by the emitter probe is received by the receiver probe and the meter wheel placed on top of the tubes acts as the depth sensor.
4. The Sonic Integrity Logger will graphically display the records.

Data Interpretation and Reporting

1. The interpretation of the test records shall be carried out by an engineer with experience in dynamic pile testing. Major inconsistency existed within the effective length shall be quickly identified and made known.
2. A full report shall be prepared within seven (7) working days from the completion of testing. The report shall include the plotted results and the specialist interpretation.

After Testing

1. After testing the MS pipes shall be filled with cement grout (OPC) to cover the holes.

Method Statement for Tree Cutting

Work Methodology

Construction Procedure

References

1. Project Quality Plan(PQP)
2. Project Executive Plan (PEP)
3. Integrated Management System Manual (IMS)
4. Environmental Management Plan ((EMP)
5. Safety & Health Management Plan
6. Emergency& Response Plan (ERP)
7. Traffic Management Plan (TMP)
8. Survey Quality Plan (SQP)
9. Contract Specification
10. Approved Construction Drawing
11. Approved Shop Drawing
12. Other Related Method Statement

Materials

1. Nil

Plant and Equipment

1. Crane (where required)
2. Sky Lift
3. Tipper Lorry
4. ¾ inches Nylon Rope

Manpower

1. Site Engineer/Site Supervisor
2. Foreman
3. Crane Operator
4. Sky Lift Operator
5. Traffic Controller
6. General Worker

Activities’ Pre-requisite

1. Re-confirm with surveyor the actual line of ROW and the area was released for construction work site possession.
2. Execute, piloting/locating of underground services to ensure the area is free from any live/in service utilities and these utilities will not get damage during site clearance work in progress. This inclusive of identify over-head services that may required extra precaution need to be exercised during trees cutting.
3. Mark and carry out registration (inventory) of all trees or stakeholders’ vegetation within ROW that are to be removed/cut.
4. Arrange and carry out site audit of prepared inventory with relevant parties/authorities for verification. Subsequent to this event, forward the verified inventory list to obtain approval from relevant authorities for cutting of registered trees. This inclusive of identify other nearby properties that may required extra precaution need to be exercised during trees cutting.
5. Request Traffic Management to organize required planning and obtaining appropriate approval for road/line temporary close.
6. Administrate relocation of utilities if there are over head lines within the work area which are affecting/obstructing trees cutting activities.

Cutting of Trees

1. Ensure all requirements stated in specification are implemented and accordingly approved for trees cutting activities.
2. Activate Traffic Controller, and mobilise required machinery/equipment to work site.
3. Execute pruning of the whole tree and cutting of branches shall only to be carried out for branches size not more than 50mm in diameter for area which near to public/traffic. In all event of tree cutting, sky lift must be used and only for chain saw operator. Using of sky lift for lifting or lowering of loads is prohibited.
4. As the pruning work completed, carry out cutting of leftover branches for the length of not more than stated in specification (cut into a length suited to fit the dump truck for hauling and disposal). Where required ¾ inches Nylon Rope is to be used to control the fall of off cut branch. Cutting of bigger diameter more than 350mm of tree branches/trunks must be carried out with assistance of suitable crane.
5. Dig up the earth on the front portion of the trunk until its main roots are exposed and extracted. With the use of backhoe, excavate the stump until it is uprooted. Ensure that the backhoe is positioned in a way that when the tree is pushed, it will fall completely to the ground without hitting or falling on other objects.