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Foundation pit support and construction method for cement mixing pile inserted with Y type precast pile

A technology of cement mixing piles and foundation pit support, which is applied in the direction of foundation structure engineering, excavation, sheet pile walls, etc., can solve the problems of limited construction conditions, slow construction period, and high cost, and achieve short construction period, convenient operation, and low cost. The effect of project cost

Inactive Publication Date: 2010-10-27
江西中旭建设工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a cement mixing pile foundation pit support and construction method with Y-shaped prefabricated piles. It is unnecessary to cons

Method used

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  • Foundation pit support and construction method for cement mixing pile inserted with Y type precast pile
  • Foundation pit support and construction method for cement mixing pile inserted with Y type precast pile
  • Foundation pit support and construction method for cement mixing pile inserted with Y type precast pile

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Embodiment Construction

[0032] Project Overview

[0033] The foundation pit of Mingfeng Building is rectangular, covering an area of ​​about 11,400 m 2 . It consists of a 13-storey main building and a podium. The foundation pit is 68m long and 23m wide. The total length of the enclosure is about 182m. The depth of the foundation pit is 7m. The retaining wall is made of cement mixing piles inserted with Y-shaped prefabricated piles. The support system of the foundation pit enclosure adopts two steel supports, and the support plane layout is in the form of square braces, and the strength grade of the concrete purlins is C30.

[0034] geological conditions

[0035] The physical and mechanical indicators of the soil layer are shown in Table 1.

[0036] Table 1 Physical and mechanical indexes of soil layer

[0037] soil layer

soil layer

name

Layer thickness / m

naturally hydrated

Rate

severe

Compression modulus

E. s1...

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Abstract

The invention discloses a foundation pit support and construction method for a cement mixing pile inserted with a Y type pile, which is characterized by comprising the following construction steps of: (1) excavating a groove; (2) enabling the cement mixing pile to be in position; (3) constructing the cement mixing pile, wherein the lifting speed of a stirrer is 0.8-1m/min, and the pressure of a guniting pump is controlled at 0.4-0.6MPa; for sandy siltseam soil, firstly, pressing swelling soil slurry prepared according to a certain proportion, and then, jetting cement slurry; (4) inserting a Y type precast pile, wherein the construction on the Y type precast pile inserted into the mixing pile needs to be completed in 4h after the mixing pile is formed; (5) manufacturing a circuit purlin; and (6) constructing steel bracings, connecting the bracings to the circuit purlin at the pit edge, and applying prestress for fixing, wherein when the distance between the steel bracings is longer than 20m, adjustable devices except splay bracings are adopted at the prestress applying end. The invention has the characteristics of water and soil blocking, simple processes, convenient operation, short construction cycle, stronger anti-leakage capacity, reduction of construction cost and the like, and is suitable for various soil layers.

Description

technical field [0001] The invention relates to the construction field, in particular to a cement mixing pile foundation pit support and a construction method for inserting Y-shaped prefabricated piles. Background technique [0002] The traditional foundation pit support method adopts the support type pile wall combined with the water-stop curtain, such as the bored pile with concrete support, and the cement mixing pile behind the pile to form the water-stop curtain enclosure method, which can better control the enclosure The structure is deformed to ensure the stability of the enclosure system. For the site with a narrow construction surface, the pile foundation construction is not easy to carry out and the quality is difficult to guarantee. Moreover, this support method adopts two types of piles: bored piles and cement mixing piles, and the cost is relatively low. higher. Bored piles are generally constructed after the construction of cement mixing piles, and the construc...

Claims

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Application Information

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IPC IPC(8): E02D17/04E02D5/20
Inventor 朱奎
Owner 江西中旭建设工程有限公司
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