Static pressure pipe pile settling construction technique

Abstract

The static pressure immersed tube pile constructing process includes the following steps: hoisting the immersed tube with pile tip and setting in place, pressing the immersed tube into ground with one static pressure piling machine while detecting whether to have the pile tip reaching the bearing stratum until reaching the required bearing pressure, and pouring concrete with the concrete pump while lifting the immersed tube gradually until the poured concrete reaches the design elevation. The in-situ high pressure concrete pouring piling process has the features of easy control, concentrated construction jobs, less environment interference, no pollution, high piling quality and low material loss.

Description

technical field [0001] The invention relates to the pile forming technology of building foundation. Background technique [0002] Existing construction methods for building foundations using mechanical piles mainly include long auger bored pile technology, diesel hammering or electric vibration type immersed pipe pile technology and hydraulic prefabricated pipe pile technology. The technical status of the construction technology of long spiral bored piles is as follows: 1. A large amount of residual soil is generated, and the biggest problem is the transportation of residual soil; 2. For different strata, the selection of drilling tools and drilling methods are extremely strict. It is easy to loose the soil at the bottom of the hole, which affects the bearing capacity and pile quality; 3. The drilling parts wear a lot and need frequent maintenance. The outstanding problems of diesel hammering or electric vibration pile forming technology are: construction noise nuisance, ai...

AI Technical Summary

Problems solved by technology

The technical status of the construction technology of long spiral bored piles is as follows: 1. A large amount of residual soil is generated, and the biggest problem is the transportation of residual soil; 2. For different strata, the selection of drilling tools and drilling methods are extremely strict. It is easy to loose the soil at the bottom of the hole, which affects the bearing capacity and pile quality; 3. The drilling parts wear a lot and need frequent maintenance

The outstanding problems of diesel hammering or electric vibration pile forming technology are: construction noise nuisance, air pollution, and secondly, due to the limitation of hammering energy and pipe diameter, it is difficult to bear high-rise buildings with large loads and piles with high bearing capacity requirements foundation construction, and its on-site operation methods are cumbersome and outdated; in addition, if saturated soft soil layer is encountered during construction, diameter shrinkage and hole collapse are prone to occur, and construction treatments such as secondary vibration or reverse insertion and re-drilling are required

The existing static pressure prefabricated pipe pile construction technology effectively solves practical problems such as residual soil, construction noise and air pollution, but it needs to be determined by the component factory according to the design requirements of single pile bearing capacity, foundation bearing layer depth and transportation conditions before construction. For prefabricated piles, when faced with complex stratum structures, such as the buried depth of the bearing layer at the pile tip is large and exceeds the limit length of the pile machine, it is necessary to weld the pile ends of multiple prefabricated piles, increase the length of the pile foundation, and then press them continuously Into the bearing layer, if the level of the bearing layer changes greatly, the redundant piles exceeding the design elevation will be cut off, and a large amount of prefabricated pile materials will be wasted; , transportation costs and losses, cut off excess prefabricated piles, etc., all increased its construction investment

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