TUBEX GROUT INJECTION PILE
The Tubex Grout Injection Pile consists of a steel pipe casing attached to a patented drill trip. The casing is used as a lining for the concrete, which is placed after the pile has been installed. The casing is usually used as a structural element of the pile. The drill tip serves as an installation aid, as well as provides the means through which grout is injected to produce a soil-cement mixture around the pile.
METHOD OF INSTALLATION
- A pipe section of length depending on the available headroom is placed in the drill table.
- The patented drill tip is welded onto the bottom of the pipe casing, providing a watertight connection.
- The drill table forces the pile into the round by means of constant vertical load, combined with torque. Piles can be installed in one piece when there are no height restrictions, but when headroom is limited, the first section is drilled down until sufficient headroom is created to slice a second pipe section onto the first. This alternating drilling and splicing operation is continued until the required depth is reached.
- Upon reaching the bearing stratum, grout is injected under high pressure through the tip via an injection pipe into the surrounding soil. The rotation of the pile in conjunction with the design of the tip produces a soil cement mixture around the casing.
- After the pile is installed, a reinforcing cage or dowels are placed, and the pile is filled with concrete.
- Absolutely vibration free, so there is no danger to adjacent buildings, structures or sensitive equipment inside those buildings.
- High capacity so fewer piles are needed.
- The full length casing may be inspected before placing concrete.
- Very low noise levels.
- The drill rig is versatile and easily moved for fast production.
- No spoils are produced. The soil is displaced laterally and compacted. There is no soil transport, and therefore no danger of undermining adjacent foundations or transporting contaminants to the surface.
PLACING TUBEX PILES FOR SEISMIC UPGRADE OF CRTC BUILDING 71, CHEVRON RESEARCH & TECHNOLOGY, RICHMOND, CALIFORNIA
- To strengthen or renew existing foundations of structures during renovation.
- For seismic Retrofitting infrastructure and other structures.
- For the installation of piles in refineries or chemical plants where height limitations or soil contaminants exist.
- In very unstable or liqifiable soil conditions.
- For installation of piles in or near existing structures where noise, headroom and vibration are considerations.
- Where high tension, compression and lateral loads are required of the pile.
INSTALLATION OF TUBEX GROUT INJECTED PILES UNDER LOW HEADROOM AT THE SCHIPHOL AIRPORT, AMSTERDAM, NETHERLANDS
DRILLING THROUGH OBSTRUCTIONS
Fundex has developed a special drill point which can drill through masonry, wood and unreinforced concrete. For renovation of the foundation of a shiplock in the Netherlands, some pile were drilled through meters of masonry.The special tips are very suitable for the renovation of ancient quay walls as much as installing pile in disposal sites.
THE TUBEX GROUT INJECTION PILE ADVANTAGE
The Tubex grout injection (TGI) pile consists of the pipe casing, a drill tip featuring grout ports, and the soil cement mixture surrounding the pipe. Water may be injected through the tip via an injection pipe to help penetrate denser soil layers during drilling. The design of the tip produces the soil-cement mixture when grout is injected under high pressure and mixes with the surrounding soils. The high injection pressure prevents the soil from obtaining "at rest" conditions, producing a pile of high capacity. Further, the effective diameter of the pile is increased to the diameter of the soil-cement column, which is approximately equal to the tip diameter.
ADVANTAGES OF GROUT INJECTION
- Increases bearing capacity -- especially enhances lateral and tension load capacities.
- The injection technique allow the pile to penetrate through denser strata.
- A larger effective diameter is created for the pile.
- The soil-cement mixture surrounding the pipe casing serves to insulate and project the pipe in corrosive soil environments.Various pile loads tests prove that by using grout-injection techniques, the bearing capacity of the Tubex pile increases considerably, and settlements are reduced. Depending on the soil characteristics, a pile with a casing diameter of 355 mm (14") and a drill tip diameter of 560 mm (22") has an allowable bearing capacity in excess of 2200 kN (430 kips). Load test data is available; please email to email@example.com or call (925) 754-6633.
Standard dimensions of the Tubex pile system in mm (inches):