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Cast-in-situ bored pile and expansion and compaction construction method thereof

A technology of bored piles and construction methods, which is applied to sheet pile walls, foundation structure engineering, construction, etc., can solve the problems of large dispersion of pile foundation bearing capacity, and achieve the effect of reducing the number of piles or the length of piles

Inactive Publication Date: 2012-04-11
SHANGHAI CONSTRUCTION GROUP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantage of pile bottom grouting reinforcement method: due to the existence of cracks in the soil layer, the cement slurry pressed by the high-pressure pump tends to spread along these cracks, resulting in a large dispersion of pile foundation bearing capacity

Method used

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  • Cast-in-situ bored pile and expansion and compaction construction method thereof
  • Cast-in-situ bored pile and expansion and compaction construction method thereof
  • Cast-in-situ bored pile and expansion and compaction construction method thereof

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Embodiment Construction

[0029] The technical content of the invention will be described in more detail below in conjunction with the accompanying drawings.

[0030] In this embodiment, taking a compression pile with a pile diameter of 600mm and a pile length of 30m as an example, the construction steps are as follows:

[0031] A) Firstly, prepare for construction: select the drilling rig, drilling tools, site layout, etc., and measure the necessary data. Before construction, the site should be leveled and debris should be removed. The position of the drilling rig should be leveled and compacted. After the drilling machine is installed, the verticality of the drilling rig should be checked. Insert a steel casing at the construction site. In order to avoid the bottom of the casing hanging in the air, causing problems such as collapse, water leakage, and slurry leakage, the lower end of the casing should be in contact with the bearing layer of the pile end during construction, such as on a natural solid...

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Abstract

The invention relates to a cast-in-situ bored pile and a construction method thereof. The construction method comprises the following steps of: A) embedding a pile casing on a construction site; B) drilling a hole; C) cleaning the hole; D) putting a dry powder expansion material into the bottom of the hole, and arranging a reinforcement cage in the hole; and E) concreting, absorbing water to expand the expansion material so as to compact sediment at the bottom of the pile, wherein the expansion material comprises 85 to 90 weight percent of cement and 10 to 15 weight percent of UEA expansive agent. The sediment at the bottom of the pile is compacted by the expansion material under the condition that construction processes are not increased, so that the sediment has the same hardness as a bearing layer at the end of the pile. Compared with the traditional grouting process at the end of the pile, the construction method is simple and applicable; therefore, in the construction method, the number or length of piles can be reduced under the condition that the bearing capacity of the pile is improved.

Description

technical field [0001] The invention belongs to the field of building construction, and in particular relates to a bored cast-in-place pile for compacting the sediment at the bottom of the bored cast-in-place pile by using an expansion material and a construction method thereof. Background technique [0002] Bored piles are widely used in the fields of transportation, water conservancy and construction because of their unique advantages such as high bearing capacity, strong adaptability and low cost. Bored cast-in-situ piles often produce sediment at the bottom of the pile. If the pile bottom sediment is not removed, it will affect the combination of concrete and bedrock, thereby affecting the bearing capacity of the cast-in-situ pile. In the prior art, there are roughly two processing methods for pile bottom sediment: [0003] 1. Hole cleaning method through mud circulation. The main idea of ​​the mud circulation hole cleaning method: After the hole is formed, the bottom ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D5/44
Inventor 孔德志朱小军
Owner SHANGHAI CONSTRUCTION GROUP
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