What is a pile drilling contractor and how is it different from a piling contractor?

A pile drilling contractor provides the drilling-only service — borehole creation for soil investigation, monitoring wells, rock coring, anchor installation, or as a subcontractor to a piling contractor. A piling contractor (like Jalmala Boring Works's piling division) provides the full pile installation service — borehole drilling PLUS reinforcement cage installation PLUS tremie concreting PLUS testing PLUS handover. Both are legitimate services but serve different buyers. If you are a geotechnical consultant who needs soil investigation boreholes, you hire a drilling subcontractor. If you are a project owner building a tower, you hire a full-service piling contractor. Jalmala Boring Works offers both.

What drilling methods do you use for soil investigation boreholes?

We use multiple drilling methods depending on soil conditions: (1) Rotary drilling with bentonite or polymer fluid — for standard soil and weathered rock; (2) Auger drilling — for soft clay and loose sand, faster and cheaper; (3) DTH hammer drilling — for hard rock and boulders; (4) Casing advancement (oscillator) — for boulders, karst, and loose strata where hole collapse is a risk; (5) Core drilling — for continuous rock sampling. Method selection depends on the soil profile, borehole depth, and the consultant's testing requirements. Standard IS 1892 protocol is followed — SPT at 1.5m intervals, undisturbed sampling at designated depths, and rock coring in bedrock.

Do you install groundwater monitoring wells and piezometers?

Yes. We install both standpipe and vibrating wire piezometers, and full groundwater monitoring wells. Standard installation includes: borehole drilling to specified depth; PVC or HDPE casing with slotted screen at the monitoring zone; filter pack (sand or gravel) around the screen; bentonite seal above the filter pack; cement-bentonite grout to surface; well development by pumping or bailing; and initial water level measurement. Documentation includes borehole log, installation record, screen depth, filter pack details, development record, and initial readings. Post-installation, the well can be used for ongoing water level monitoring and water quality sampling.

What is rock coring and when is it required?

Rock coring is the extraction of continuous cylindrical rock samples (cores) from a borehole. Common core diameters are NX (54mm) and HQ (63.5mm). Required when: (1) structural design requires confirmation of rock strength and quality at specific depths; (2) rock-socketed pile design requires the unconfined compressive strength (UCS) of the rock; (3) foundation on rock needs RQD (Rock Quality Designation) data; (4) slope stability or tunnel portal design requires rock mass characterization. Deliverables: cleaned and boxed core samples, core photographs, core logging with RQD calculation, joint description, and UCS testing on selected samples. Our rock coring is used across Gujarat — Saurashtra basalt, North Gujarat granite, Kutch hard strata.

What is DTH hammer drilling and when do you use it?

DTH (down-the-hole) hammer drilling is a percussive drilling method where a pneumatic or hydraulic hammer at the drill bit drives into rock, cutting faster than rotary drilling in hard rock. Used when: (1) Saurashtra basalt, Kutch hard strata, or other very hard rock is encountered; (2) rotary drilling is too slow or the bit wears out too fast; (3) deep anchor or micropile drilling needs to penetrate hard rock efficiently. DTH drilling is faster than rotary in hard rock but generates more noise and vibration — so it is not suitable for urban sites with sensitive adjacent structures. We select DTH for remote sites, infrastructure, and quarry-adjacent work where hard rock dominates and vibration is not a constraint.

Do you provide drilling-only subcontracting to piling contractors?

Yes. We provide drilling-only subcontracting to piling contractors, main contractors, and consultants who already have their own concreting and testing capability. Services include: borehole creation for pile installation; rock socketing to specified depth and diameter; casing advancement for boulder or karst zones; and DTH drilling for hard rock. Deliverable: completed boreholes per specification, ready for the piling contractor's cage installation and concreting. This is a niche service — few Indian contractors specialize in drilling-only work. Our equipment fleet and experienced drillers make us a reliable drilling partner for larger piling contractors.

What documentation do you provide at the end of drilling?

Standard drilling documentation includes: (1) borehole log with strata description, depth, color, consistency, moisture content; (2) SPT N-values at 1.5m intervals; (3) undisturbed sample locations and depths; (4) rock core recovery percentages and RQD; (5) groundwater level readings; (6) borehole backfill record; (7) photographs of samples or core boxes; (8) complete drilling report with method statement and any deviations from specification. For monitoring wells: installation record, screen depth, filter pack details, development record, and initial water level. Documentation is provided in both hard copy and digital format (PDF), aligned with the consultant's reporting requirements.

How can I contact Jalmala Boring Works for a drilling project in Gujarat?

Call +91 93745 45415 or email jalmala.pile@gmail.com. Mention 'drilling subcontractor' and share your project location, borehole depths, sampling requirements, and any specific testing protocols from your consultant. Our team responds within 24-48 hours with a drilling proposal including method selection, mobilization timeline, and pricing. Main office is at Dholka Road, near Nariampura Village, Narimanpura, Sarkhej, Ahmedabad, Gujarat 382210.

Our Service

Pile Foundation

Bored Cast-in-Situ Piling Specialists

Jalmala Boring Works provides Pile Foundation and Deep Foundation Solutions using Bored Cast-in-Situ Piles for residential, commercial, industrial, and infrastructure projects. With advanced Hydraulic Rotary Rigs, we construct piles from 300 mm to 1800 mm diameter and depths of up to 50 metres, delivering reliable load-bearing capacity across soft soil, hard rock, and high groundwater conditions.

Bored Cast-in-Situ Piles: 300 mm – 1800 mm Diameter

Pile Depths up to 50 Metres

Hydraulic Rotary Rigs & DMC Percussion Methods

Temporary & Permanent Steel Casing

Tremie Concreting (RMC & Site-Mix)

Static & Dynamic Pile Load Testing

Suitable for Soft Soil, Hard Rock & High

Groundwater Conditions

Complete Deep Foundation Solutions from Design

Support to Execution

50mMax Depth

How We Work

Our Piling Methods

We deploy six proven techniques — selected based on soil profile, site constraints, and project requirements.

Hydraulic Rig

We specialize in bored piling with diameters ranging from 200 mm to 2000 mm and depths up to 50 meters. Using advanced hydraulic rotary rigs, we execute piling operations efficiently across a wide range of soil conditions. Our fleet includes high-performance rotary drilling rigs capable of working in restricted headroom areas while delivering precision, stability, and high productivity.

Secant Pile Walls

Secant pile walls are constructed by intersecting reinforced concrete piles to form a continuous retaining structure. Primary piles are installed first, followed by reinforced secondary piles after sufficient curing. This technique provides excellent groundwater control and soil retention, making it ideal for deep excavations, basements, and foundation support in challenging ground conditions.

Manual Auger Method

The Manual Auger Method is a reliable piling technique suitable for locations with restricted access or where low noise and vibration are essential. A tripod and manual winch system are used to drill boreholes using a helical auger. This method is commonly employed for pile diameters ranging from 250 mm to 1000 mm and offers an economical solution for smaller foundation projects.

TMR — Water Circulation

Our Truck Mounted Rotary (TMR) rigs utilize continuous bentonite slurry circulation to stabilize boreholes during drilling. Auger drilling is performed to the required depth while bentonite slurry supports the excavation and carries excavated soil back to a recycling tank. This method ensures bore stability, efficient spoil removal, and high productivity, particularly in loose or soft soil strata.

DMC Pile Method

The DMC Pile Method employs Mendola-type rigs combined with bentonite drilling fluid for safe and efficient pile construction. Surface soil is loosened using a bailer before drilling continues with a percussion chisel. Bentonite slurry stabilizes the bore while transporting excavated material to settling pits. Once the desired depth is achieved, the drilling tools are removed and the final depth is verified before reinforcement and concreting.

Tractor Mounted Rotary Rig

This method utilizes tractor-mounted rotary drilling rigs for fast and economical pile boring. Auger drilling is carried out to the required depth, with DMC rods added progressively to achieve deeper penetration through varying soil strata. It is particularly suitable for medium-depth foundation works and offers drilling capacities of up to 16 meters with excellent operational efficiency.

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