Full sleeve large diameter vibration soil taking and filling pile construction method

Abstract

A construction method of cast-in-situ pile by use of the whole sleeve pipe and taking soil out in large-diameter vibration mode features that the internal and external sleeve pipes are used as the tool for forming hole and taking soil out, the MF or HF vibrating hammer with great vibration exciting force plus pressurizing and water lubricating are used to greatly increase the power of sinking pipe and soil taking unit to pass through foundation, after the external pipe is sunk in foundation the reinforcing bar cage is put in it and concrete is filled in it, and the external pipe is finally pulled up under the action of said vibrating hammer.

Description

1. Technical field [0001] The invention relates to a construction method for pile foundations, in particular to a construction method for vibrating cast-in-place piles obtained from soil. 2. Background technology [0002] At present, there are dozens of pile foundations used in various projects. According to different construction techniques, the current dominant pile types in my country are divided into bored cast-in-situ piles, vibrating cast-in-place piles, rammed and expanded piles, artificial excavated piles, and prestressed pipe piles. piles, prefabricated square piles, and various flexible and semi-flexible piles for soft foundation treatment (such as cement mixing piles and powder spray piles, sandstone piles or gravel piles), etc. As far as the various dominant pile types are currently used, there are the following problems: [0003] (1) Bored piles often have quality problems such as broken piles, necking, and segregated mud, which cause hidden dangers in the proje...

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Problems solved by technology

[0003] (1) Bored piles often have quality problems such as broken piles, necking, and segregated mud, which cause hidden dangers in the project; the construction process is complicated, the construction time is long, and the labor input is large; the amount of solid waste is large and the environmental pollution is serious; The bottom sediment is not easy to discharge and the mud retaining wall leaves the pile side mud skin, which greatly reduces the pile bottom reaction force and side wall friction of the pile foundation, and reduces the bearing capacity of the pile foundation

[0004] (2) Although the quality of prefabricated square pile construction is well controlled, it must be prefabricated in the factory, and the equipment requirements are high; the cement label and concrete strength requirements are high, and the transportation workload is heavy; the static pressure pile construction equipment is heavy, and the site requirements are high. It is difficult to move in and out, difficult to shift, and high cost; if hammering construction is used, the vibration is large, and the pile head is easy to crack

[0005] (3) Both vibrating cast-in-situ piles and rammed and expanded piles belong to the construction of squeezing soil, which has a great impact on the safety and stability of the front and rear piles and surrounding buildings, while the construction of rammed and expanded piles has a great impact on the surrounding environment due to their vibration and noise. influences

[0006] (4) Manual excavation piles are restricted in many areas due to potential safety hazards and difficulties in solving the problems of mud and quicksand

In recent years, through the introduction of foreign technology, the full casing rotary excavation cast-in-place pile and the rubbing pipe flushing soil grabbing pile have been introduced. Although the problems of soil extrusion and mud pollution have been solved, these equipments are expensive, the construction cost is high, and the effect is not good. high

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