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14/03/2023 01:55:53 PM

Cast-in-place Pile Construction Method

Cast-in-place pile construction is the method to complete the piles by placing the concrete after installing the reinforced cage to be arranged on site into bore hole. Cast-in-place pile construction has various methods based on drilling method, pile diameter, pile length, etc.

Construction technology using solution to keep the wall of the excavation hole
The method of this technology is to use a hole making device to remove the soil from the hole. At the same time inject into the hole a solution capable of forming a membrane that holds the wall of the excavation and has a specific gravity slightly higher than groundwater in the soil to balance the pressure when taking up the soil. Next, clean the sediment (sediment and loose soil) falling on the bottom of the hole, ensure direct contact of the concrete pile tip later on to the good bearing ground, increase the tip resistance of the pile. Then proceed to pour concrete or reinforced concrete by the method of pouring concrete under water, that is, pouring concrete continuously from the bottom of the hole, not allowing the newly poured concrete to come into direct contact with the retaining solution. the concrete conduit is always inside the poured concrete block, so that the concrete out of the conduit is not directly in contact with the solution), the extruded concrete gradually takes the place of the retaining solution, pushing this solution out. outside the hole. Finally, when the pile concrete has set, cured and reached a certain strength, conduct open excavation at the top of the pile and remove this pile top - usually the poor quality concrete due to mixing with the retaining solution. formed at the beginning of concrete pouring and is gradually pushed to the top of the pile during the concreting process.
 
Dig the ground with a Hammer grab
 
In short, the technological method is to use the solution to keep the excavated hole wall in place of the ground soil at the position of the pile hole and then replace this solution with concrete mortar.
However, there are many different methods of creating pile holes, so there are many different construction technologies for concrete-filled piles, according to each hole-making method.
 
Construction technology uses wall pipes (casing) to keep the walls of the entire excavation pit
This technology is only different from the construction technology using solution in that: to create a hole, it must simultaneously lower the wall pipe system (concrete or steel), surrounding the excavated hole wall, to that depth. After drilling or digging the excavation hole, the entire depth of the hole is covered by a wall pipe (also known as "casing"), forming a solid concrete mold shell for casting bored piles. In the bored pile (excavated) hole, when the soil is removed, it is possible that groundwater will occupy the place, without the need for bentonite at all.