Method Statement For Pile Driving

SCOPE

This procedure refers only to the installation of the piles indicated. It does not include bored piles and jacked-in piles.

TYPE OF PILE

600mm Diameter Spun Pile

Working Load = xxxT          

EQUIPMENT

The following types of Hydraulic shall be used:

600mm Diameter                    -                       9 Ton Hydraulic Hammer

PILE SET CALCULATION

For this calculation, Hiley Formula will be used to compute the estimated SET for each type of pile:

Hiley formula :

SET = Awh / fL x (W+Pe²) / (W+P) – C/2

Hammer Efficiency                                         A

Mass of Hammer                                             W

Drop of Hammer                                             h

Safety Factor                                                  f

Pile Working Load                                          L

Total Mass                                                       P

Coefficient of Restitution                               e

Temporary Compression                                 C

Summary of Sets is to be attached. Set Calculation detailed with respect to hammer, drop and estimated penetration need to be provided.

The actual SET values will be recomputed at site based on the variable parameters of actual pile length installed and the actual temporary compression recorded.

SITE PREPARATION

Piling platform will be leveled prior to piling activities

SETTING OUT

Boundary survey shall be carried upon possession of site based on the pre-computation plan available. Setting out plan shall be submitted for checking and approval.

HANDLING, PITCHING, DRIVING AND EXTENSION

All handling and lifting will be at the designed lifting points and support points.

Boundary survey shall be carried upon possession of site based on the pre-computation plan available. Setting out plan shall be submitted for checking and approval.

During pitching and driving, the vertically of the pile will be continuously monitored and plumbed to ensure the pile is centrally in line with the pile axis to receive the hammer to prevent pile whip, twist or rotation.

Each pile shall be clearly marked with red ink at 300mm intervals along its length to enable the driving blows to be recorded at every 300mm depth of pile penetration.

The pile will be extended by butt-welding the steel plates on the pile heads. On completion of welding, the slag will be chipped off and wire brushed to receive red-oxide paint.

Each pile shall be driven continuously until the specified set and / or depth has been reached. A detail record of the driving resistance over the full length of each pile should be kept.