Services — Deep Foundations

Bored Piling Services

Bored piles are chosen when the required bearing capacity is high, or when a hard soil layer stops driven piles. A case we meet often: the consultant has calculated the required diameter and a 20 metre depth, but during driving a sand lens turns up at 10 metres. Driven piles usually stop there — bored piles pass through it without difficulty.

Conversely, when the required capacity is modest, bored piling is not the right call — other methods are more economical. We say this plainly because the market for bored piling is specific: for projects with particular demands, not for every foundation job.

Discuss Your Project View Projects

Bored piling rig at work on site — Fig. 01 — Bored piling rigSemarang

Diameter

400–1,200 mm

Depth

up to 30 m

Method of Work

Sequence of execution

Setting out & verticality control

Pile positions follow the shop drawings, and verticality is maintained throughout drilling. Deviation at this stage cannot be corrected once concrete is in.

Drilling

The drilling method is matched to soil conditions. Casing is used in collapse-prone ground so the bore wall holds until concreting.

Base cleaning & reinforcement

The base of the bore is cleaned before the cage is lowered. Bar configuration follows the design drawings and is recorded pile by pile.

Concreting

Concreting proceeds once the bore is ready. Ground surface, bore length, effective length, tip level and stop-cast are recorded for every pile.

Testing & Reporting

Quality evidence per pile

There is no uniform testing package, because every project differs. What owners request most often is PDA and PIT testing, and we prepare it to each project’s specification. Beyond testing, every pile carries its own piling record covering ground surface, bore length, effective length, tip level, stop-cast, bar configuration, and soil data from samples taken during drilling — so ground conditions at each point are documented, not assumed from the nearest CPT.

Piling record per pile PIT / PDA testing Soil data per bore point

Drilling Methods

Matched to site conditions

Most design consultants already understand bored piling, so the questions that reach us go straight to execution: can the work be done using dry bore, or does it need wash boring. We do both, and the choice depends on the soil and the groundwater table on site.

Dry bore Wash boring Casing in collapse-prone ground