Construction method of cast-in-situ stiff piles for foundation pit supporting

A foundation pit support and construction method technology, which is applied to foundation structure engineering, sheet pile walls, buildings, etc., can solve the problems of inconsistent force characteristics of support piles, difficulty in meeting construction requirements, low steel utilization rate, etc., and achieve construction Simple and fast, self-compacting, time-saving effect

Inactive Publication Date: 2015-03-04
CHINA CONSTR 4TH ENG BUREAU 6TH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the improvement of the development and utilization of urban space, the site conditions of deep foundation pit support projects are becoming more and more harsh, especially in the case of small foundation pit sites and tight construction schedules, large-diameter cast-in-place piles and rotary excavation piles are subject to The limitation of stratum and mechanical operation space is difficult to meet the construction requirements; the main bending moment of the support pile does not match the force characteristics of the traditional uniform reinforcement form, resulting in low utilization rate of steel

Method used

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  • Construction method of cast-in-situ stiff piles for foundation pit supporting
  • Construction method of cast-in-situ stiff piles for foundation pit supporting

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Embodiment Construction

[0016] Referring to the accompanying drawings, the construction method of cast-in-place stiff piles for foundation pit support includes the following construction steps:

[0017] a. After setting out the line and laying the construction platform, use the auger drilling machine to drill the pile hole. The diameter of the pile hole is 350mm. Verticality deviation is not more than 0.5%;

[0018] b. Making and hoisting steel brackets

[0019] Making the shaped steel bracket is to adopt a plurality of connecting rods 4 to weld two parallel channel steels 3 to fix the formed steel bracket 1, hang the finished shaped steel bracket 1 to the center of the drilling hole, and then fill the crushed stones 2 into the Inside the drilled hole and cover the shaped steel support 1, the particle size of the crushed stone is 10-25mm;

[0020] c. Grouting

[0021] Secondary grouting is adopted, the first grouting is normal pressure grouting, and the grout is injected until it overflows the ori...

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Abstract

The invention discloses a construction method of cast-in-situ stiff piles for foundation pit supporting. The method comprises the following construction steps: paying off and locating; after a construction platform is laid, drilling pile holes by a spiral drilling machine, wherein the pile holes have the apertures of 350mm, and when the pile holes are drilled, the maximum drilling amount of every time is less than or equal to 500mm, the deviation between the center of a drill bit and each pile position is less than or equal to 5cm, and the pile verticality deviation is less than or equal to 0.5%. After the construction method is adopted, the utilization rate of a reinforcing steel bar of a pile body is improved, the construction technology is simplified, the cost is lowered, and the time limit for a project is shortened.

Description

technical field [0001] The invention relates to the field of building foundation pit support, and is especially suitable for the construction method of rigid piles for foundation pit support in a pile-anchor support system. Background technique [0002] With the improvement of the development and utilization of urban space, the site conditions of deep foundation pit support projects are becoming more and more harsh, especially in the case of small foundation pit sites and tight construction schedules, large-diameter cast-in-place piles and rotary excavation piles are subject to The limitation of strata and mechanical operation space is difficult to meet the construction requirements; the main bending moment of the support pile does not match the force characteristics of the traditional form of uniformly distributed reinforcement, resulting in low steel utilization. Contents of the invention [0003] The purpose of the present invention is to provide a construction method o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D5/36E02D15/04
CPCE02D5/36E02D15/04
Inventor 陈晨程群刘芳玲周璇
Owner CHINA CONSTR 4TH ENG BUREAU 6TH
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