Global Hospital

Perumbakkam, Chennai

Hospital foundation and pile load testing package at Perumbakkam, Chennai.

Project Overview

Bored cast in-situ piling together with confirmatory load testing for the Global Hospital site at Perumbakkam.

Axial compression tests with kentledge blocks, lateral load tests and pull-out tests were carried out as per IS 2911 Part 4 using hydraulic jacks, dial gauges and pressure gauges.

Test results were compiled into certified reports for the structural consultant's approval.

Scope of Work

Setting out and verification of pile positions against the structural grid at Perumbakkam, Chennai, jointly signed off with the client's site engineer.
Boring / driving of the full pile schedule using the bored cast in-situ pile & load test.
Fabrication, lowering and centring of reinforcement cages with cover blocks to the specified concrete cover.
Continuous tremie concreting of every pile with cube sampling and pour records maintained per pile.
Chipping back to cut-off level, disposal of muck and handover of the as-built pile schedule.

Machinery & Plant Deployed

Tractor mounted rotary DMC rigs with mud pumps and circulation tanks
Bentonite mixing and desanding plant with specific gravity check kit
Weighted chisels for penetrating hard laterite and boulder strata
Reinforcement cage fabrication yard with bar bending and cutting machines
Tremie pipe assembly with hopper for continuous concrete placement
Transit mixers with on-site slump and cube testing

Execution Timeline

Mobilisation
Rigs, cages, casings and site establishment moved to Perumbakkam, Chennai, with access roads and working platform levelled for rig movement.
Trial pile & test bore
A trial pile was executed and observed against the borelog to confirm strata, penetration rate and concrete consumption before the production schedule opened.
Production piling
The full pile schedule executed in a planned sequence to keep rigs clear of freshly cast piles.
Testing & handover
Load and integrity testing on the agreed sample of piles, followed by trimming to cut-off level and handover of records to the main contractor.

Load Testing & Quality Results

Initial load test	Test pile loaded in increments to 2.5 times the design working load as per IS 2911 Part 4, with each increment held until the settlement rate stabilised. Safe working load confirmed for the designed pile section.
Routine load test	Working piles from the production schedule tested to 1.5 times design load. Settlement at test load and residual settlement after unloading remained within the permissible limits laid down in the code.
Pile integrity test	Low-strain integrity testing carried out on sample piles; reflectograms showed continuous shafts with no necking or discontinuity down to the founding level.
Concrete cube testing	Cubes cast from every pour and tested at 7 and 28 days, with all results meeting or exceeding the specified grade.