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.