Prestressed Concrete Piles & Bored Pile

Since 1962, Prestressed Concrete Pile of General Engineering Public Company Limited are well-known and widely accepted.GEL - Prestressed Concrete Pile have been approved by Thailand Industrial Standard under certificated of TIS. 396 – 2549 (2006) and Quality Management System ISO 9001:2015 by Management System Certificated Institute (Thailand). Over the past five decades, the company has produced and piling prestressed concrete piles more than two million piles, which reflects the quality of prestressed concrete piles under GEL brand.

In addition to Prestressed concrete piles, GEL also has CIP : Bored Cast-in-Situ Pile system to serve the needs of customers. GEL’s Pile is a quality product, being used for ground works of various forms of building, that help reduce construction duration and cost of construction very well, especially, for the areas of soft soil in Bangkok Metropolitan Region. Currently, GEL has manufactured a various types and size of prestressed concrete piles to meet customers demand and need, both the government and the private sector.

Properties of Prestressed concrete product

Concrete with compressive strength when it is tested at 28 days of not less than 350 kg. /sq. cm. for the sample of cylinder shape concrete at a diameter of 15 cm. and at the height of 30 cm.

Cement used is Portland cement under category 3 which generates quick compressive strength under ASTM C150 standard and TIS. 15 , Volume 1, - 2004.

Concrete admixtures , according to the ratio set by manufacturer to aggregated concrete used in the production to obtain aq high compressive strength in a given period.

Clean and good quality of sand and stone materials from good source of raw material so that various mixtures can capture together well and have high compressive strength.

Production is in compliance with production process of Prestressed Concrete before pouring concrete.

Compressive strength of the concrete must be less than 250 kg / sq. cm. to enable to produce Prestressed Concrete.

Go through the curing process with water 3-7 days before it can be delivered to the construction site for drilling.

restressed concrete pile Types

I Pile

  • I shape prestressed concrete pile is suitable for housing, warehouse, small factory and low-rise building. Available from 4-29 metre lengths.

Square Pile

  • Square shape prestressed concrete pile is suitable for housing, factory, low-rise building, high-rise building and infrastructure. Available from 4-30 metre lengths.

Square Hollow Core Pile

  • Square hollow shape prestressed concrete pile is suitable for infrastructure. Available from 10-30 metre lengths.

Spun Pile

  • Prestressed concrete spun pile by compressive strength (cy) is 500 ksc at 5 days and suitable for factory, low-rise building, high-rise building and infrastructure

Bored Cast-in-Situ Pile (CIP)

CIP is a bored cast-in-situ pile by using soil drilling method and installing steel casing throughout the pile length which can be prevented erosion of soil layer around the hole. Therefore, the installation procedures will be uncomplicated and fast. It is commonly used in the following areas:

  • Projects that are required foundation to support large-scale structures
  • Areas that are not convenient for pile driving
  • Areas that are required reducing soil pressure problems from the replacement of piles
  • Areas that are avoided noise and vibration pollution form pile driving

GEL CIP method is excavation by using soil drilling method and installing steel casing throughout the pile length with available diameters from 40 to 100 cm. and depth from 8 to 30 m.


1. Reduce damage to building around construction area due to soil movement

2. Reduce noise pollution compared to the driving method

3. Free vibration drilling

4. Use to replace in the area driving pile method is not suitable

5. Boring of soft layers, sand and gravel layers and the deposit strata are possible by using steel casing


GEL is leaders in the field of prestressed concrete construction with over 45 years of experience. We are specialist engineers and manufacturers of components and equipments for post tensioned concrete structure