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A foundation pit supported by composite bamboo reinforcement and anchor spraying and its construction method

A technology of anchoring and spraying support and construction methods, which is applied in the direction of basic structure engineering, excavation, construction, etc., and can solve the problem of large variability in the geometric parameters and mechanical parameters of bamboo reinforcement, the rigid support system is easily damaged, and the construction of surrounding boundary projects is affected and other problems, to achieve good support effect, light weight and low density

Active Publication Date: 2021-05-04
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In conventional anchoring and shotcrete support construction, steel bars are often used to make anchors and grids, but the use of steel in foundation pit construction mainly has the following three shortcomings: 1. Steel is easy to rust in a humid environment. Part of the treatment is very difficult, which will affect the later construction of the surrounding land boundary. Third, the cost is relatively high
First of all, the anchor rod in this technology uses a whole piece of bamboo, and the geometric parameters and mechanical parameters of the bamboo tendon vary greatly, so it is difficult to guarantee the anchoring quality of the anchor rod, and the scope of use is limited; secondly, the bamboo tendon is not waterproofed, and the durability of the bamboo tendon will be reduced. In addition, the anchor-spray support system does not have the function of yielding pressure, and its scope of application is limited. The expansion and deformation of expansive soil under the action of external factors will generate greater pressure on the foundation pit support system, and the rigid support system Very vulnerable to damage, once the foundation pit is damaged, it will have very serious consequences for the surrounding buildings

Method used

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  • A foundation pit supported by composite bamboo reinforcement and anchor spraying and its construction method
  • A foundation pit supported by composite bamboo reinforcement and anchor spraying and its construction method
  • A foundation pit supported by composite bamboo reinforcement and anchor spraying and its construction method

Examples

Experimental program
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Effect test

Embodiment 1

[0068] Step (1) Use moso bamboo with an age of 3 years to make bamboo reinforcement anchors 1, weave bamboo reinforcement grid 2, make bamboo reinforcement U-shaped anchors 3, bamboo silk and bamboo reinforcement locator 17;

[0069] ①, processing the moso bamboo into bamboo slices with a width of 6mm and a thickness of 7mm, which needs to be processed into bamboo slices with a width of 4mm and a thickness of 6mm for weaving the bamboo reinforcement grid; the bamboo slices are processed into nail points 42 The length is 25cm, and the nail body 41 is the bamboo bar U-shaped anchor 3 with the length of 3cm; and the thin bamboo wire with the length of 2mm;

[0070] ②. Make the bamboo reinforcement anchor rod 1, and the bamboo pieces for weaving the bamboo reinforcement grid 2 need to be air-dried naturally at room temperature for 7 days; The surface of the bamboo slices, the thickness of the coating film is controlled at 0.2mm, after 24 hours the coating film on the surface of th...

Embodiment 2

[0079] Step 1, using moso bamboo with an age of 4 years to make bamboo reinforcement anchor 1, weaving bamboo reinforcement grid 2, making bamboo reinforcement U-shaped anchor 3, bamboo silk and bamboo reinforcement locator 17;

[0080]①. Processing the moso bamboo into bamboo slices with a width of 7mm and a thickness of 6mm, which is used for weaving the bamboo reinforcement grid, which needs to be processed into bamboo slices with a width of 5mm and a thickness of 7mm; the bamboo slices are processed into nail points 42 The length is 30cm, and the nail body 41 is a bamboo bar U-shaped anchor 3 with a length of 2cm; and a thin bamboo wire with a length of 3mm;

[0081] ②. Make the bamboo reinforcement anchor rod 1 and the bamboo pieces for weaving the bamboo reinforcement grid 2 need to be air-dried naturally at room temperature for 10 days; The surface of the bamboo slices, the thickness of the coating film is controlled at 0.3mm, after 24 hours the coating film on the surf...

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Abstract

The invention discloses a foundation pit and a construction method for pressure composite bamboo reinforcement anchor spraying support, including a foundation pit, bamboo reinforcement anchors, a pressure relief device and a sprayed bamboo silk concrete layer mixed with bamboo silk; bamboo reinforcement anchors are buried In the lofting hole on the side wall of the foundation pit, one end of the pressure relief device is connected to the bamboo reinforcement anchor rod, and the other end is extended to the side wall of the foundation pit and fixed. The sprayed bamboo silk concrete layer is laid on the side wall of the foundation pit and the pressure relief device The end of the device is buried therein. The technical effect of the present invention is that the pressure relief device can provide pressure relief step by step, effectively protecting the bolt-spray support system and ensuring the safety of the foundation pit. The diameter of the anchor rod can be flexibly selected and the tensile strength of the anchor rod can be adjusted. Bamboo comes from a wide range of sources and is renewable, and the bamboo reinforcement anchor is simple to make and convenient to construct. The investment can be saved on the premise of satisfying the stability of the foundation pit engineering.

Description

technical field [0001] The invention relates to a construction method of a soil foundation pit, in particular to a construction method and a construction method for supporting the foundation pit by using yielding composite bamboo reinforcement anchor spraying after the excavation of the expansive soil foundation pit. Background technique [0002] Expansive soil is widely distributed in my country, such as Guangxi, Sichuan, Shaanxi, Hubei and other provinces. With the development of the central and western regions, there are more and more foundation pit projects in expansive soil areas, and the destructive effect of expansive soil on foundation pit projects The problem is also becoming more and more prominent. Due to the water absorption and expansion characteristics of expansive soil, uneven vertical or horizontal expansion and deformation of the structure often occur, resulting in displacement, cracking, inclination or even destruction. However, the elongation of the traditi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D17/04E02D5/76
CPCE02D5/76E02D17/04E02D2300/002E02D2300/0071E02D2600/20
Inventor 罗正东王奎董辉马雯波杨桃蒋秀姿苏永华谭荣晒吴鹏
Owner XIANGTAN UNIV