Precast pile construction method capable of dissipating foundation soil pore water pressure and preventing pile body from floating

Abstract

The invention belongs to the technical field of precast piles, and particularly relates to a precast pile construction method capable of dissipating foundation soil pore water pressure and preventinga pile body from floating. By changing the stress state of the precast pile in the construction process, an added drainage plate is attached to the pile body of the precast pile and enters a preset stratum along with pile sinking of the precast pile, and construction equipment does not need to be added, then the pore water pressure generated in foundation soil in the precast pile construction process can be effectively dissipated, floating and horizontal displacement generated in the precast pile construction process are effectively controlled, damage to surrounding adjacent buildings, roads and pipelines is avoided, and the influence on the surrounding environment is reduced.

Description

technical field [0001] The invention belongs to the technical field of prefabricated piles, and in particular relates to a prefabricated pile construction method capable of dissipating foundation soil pore water pressure and preventing piles from floating. Background technique [0002] At present, soft soil foundations (including land reclamation) are widely distributed in coastal areas, and a large number of industrial buildings and civil buildings are treated with prefabricated piles. , It will cause the foundation soil to uplift and horizontal displacement, and then cause the pile body to float or horizontal displacement or even fracture, and the scope of influence is large. The soil squeezing effect will also cause damage to surrounding houses and municipal facilities. The larger and denser the pile group, the higher the pore water pressure, the slower it will dissipate, and the wider the spread. The prior art generally adopts the following methods to prevent the floati...

AI Technical Summary

Problems solved by technology

The prior art generally adopts the following methods to prevent the floating and horizontal displacement of the pile body caused by driving the saturated cohesive soil foundation into a large-area group of piles: (1) pre-drilling piles, this method has a long construction period and high cost, and requires multiple equipment to work crosswise At the same time, the silt discharged from the drilling pollutes the site, which affects the piling construction in the next process, and the pre-drilling will also reduce the side friction of the prefabricated pile

(2) Set up drainage boards or bagged sand wells. Since it is necessary to carry out vacuum or surcharge preloading on the proposed site before piling, pretreatment of the site is carried out through the vertical drainage channels (drainage boards or bagged sand wells). This method needs to increase the construction period by 90-120 days, and the cost is high and the construction period is long

(3) Control the piling speed and daily piling volume. This method greatly reduces the efficiency of construction equipment, and the construction period is long, which increases the equipment shift fee

(4) Repeated driving is generally carried out after the pile sinking is completed. This method needs to cut the pile and reinforce the pile head, and the cost is high and the construction period is long.

[0003] Traditional prefabricated piles cannot effectively and timely dissipate the pore water pressure caused by piling; cannot avoid and reduce the floating and horizontal displacement of prefabricated piles; cannot improve the bearing capacity of foundation soil; have varying degrees of impact on surrounding buildings; and traditional prefabricated piles have no Function of eliminating pore water pressure of foundation soil

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