Construction process of prestressed static pressure pipe pile

Abstract

The invention relates to a foundation processing engineering technology, and specifically relates to a construction process of a prestressed static pressure pipe pile, which is characterized in that in construction, the pile pressing force of a pile driver can be not less than 1.2 times the standard value of vertical limit bearing capacity of a single pile, and the deviation of the formed pile is controlled between 2mm and 5mm; the verticality of a pile body is controlled at plus or minus 3mm, and the number of pile extension welding layers is not less than 2; and the time of natural cooling is about 8 to about 10 minutes, and the dislocation deviation of two pile hearts is not greater than 2mm. The method has the beneficial effects that the self weight of a pile driving mechanism of a static pile driver and a counter weight on a pile frame are used as a reaction force to press precast piles into the ground, so that the impact on the surrounding building environment and underground pipelines is reduced, the problems that the pipe pile body is easily broken and crushed or the pipe pile is longitudinally cracked by the too large pile pressing force (clamping force) are solved, and the construction can be carried out in fields in which more underground obstructions or boulders exist.

Description

technical field [0001] The invention relates to foundation treatment engineering technology, in particular to a construction technology of prestressed static pressure pipe piles. Background technique [0002] With the development of our country's economy, the number of construction projects continues to increase. Prestressed static pressure pipe piles have been developed and popularized in foundation treatment projects because of their advantages such as short construction period, low unit bearing capacity and low cost. At the same time, due to the increasingly prominent disadvantages of hammering construction in terms of environmental protection, static pressure construction is becoming more and more common, and many technical issues about the quality and safety of static pressure pipe piles caused by this have also attracted people's attention. At present, the main problems are: (1) it still has a soil squeezing effect, which has a certain impact on the surrounding buildin...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to adopt a kind of prestressed static pressure pipe pile construction technology, and the counterweight on the pile frame is pressed into the soil by the self-weight of the pile pressing mechanism of the static pile driver and the counterweight on the pile frame, thereby reducing the impact on the pile. The impact of the surrounding building environment and underground pipelines also overcomes the problem that excessive pile pressure (clamping force) easily crushes the pipe pile body, or causes longitudinal cracks in the pipe pile, and can be removed from underground obstacles. Or the site construction with many boulders