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A self-adaptive and automatic compensation method for prestress of mixed support in foundation pit excavation

A hybrid support and automatic compensation technology, used in excavation, infrastructure engineering, construction, etc., can solve the problem that the stress loss of the support structure cannot be compensated in time, and achieve high reliability of device design, prevention of stress relaxation, and prevention of tension. the effect of destruction

Active Publication Date: 2020-08-21
THE FIRST ENG OF CHINA RAILWAY 16TH CONSTR BUREAU GROUP
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Problems solved by technology

[0004] In view of the above shortcomings of the prior art, the purpose of the present invention is to solve the problem that the stress loss in the supporting structure cannot be compensated in time during the excavation of the foundation pit

Method used

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  • A self-adaptive and automatic compensation method for prestress of mixed support in foundation pit excavation
  • A self-adaptive and automatic compensation method for prestress of mixed support in foundation pit excavation
  • A self-adaptive and automatic compensation method for prestress of mixed support in foundation pit excavation

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Embodiment Construction

[0036] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and through specific implementation methods.

[0037] combine figure 1 , a device for foundation pit excavation mixed support prestress self-adaptive automatic compensation, comprising: high-strength nut 1, outer steel pipe sleeve base 2, high-strength screw rod 3, outer steel pipe sleeve 4, high-strength spring 5, Inner layer steel pipe sleeve 6, screw hole 7.

[0038] combine figure 2 According to the previous calculation requirements, select the size of the high-strength screw and weld it on the base. Design the diameter of the outer steel pipe sleeve according to the diameter of the steel support on site, and its inner diameter is the same as the steel pipe in the steel support.

[0039] combine image 3 According to the inner diameter of the outer steel pipe sleeve, the outer diameter of the inner steel pipe sleeve is designed. The thic...

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Abstract

The invention provides an adaptive automatic compensation device and method for mixed support prestress during foundation pit excavation. The adaptive automatic compensation device is jointly composedof materials such as a high-strength spring, high-strength screw rods, high-strength nuts and a steel pipe. The principle that when compressed or stretched, the spring generates elastic force opposite to the force applied to the spring is utilized to automatically compensate lost prestress in a steel support. The adaptive automatic compensation device is simple in structure and convenient to use,and especially when the steel support is dismantled in the later period, as long as the nuts are tightened to compress the spring, the steel support can be easily dismantled. Through the adaptive andautomatic compensation method for the mixed support prestress during foundation pit excavation, it can be ensured that the reliable prestress of the steel support is maintained in the construction process, the problem of stress relief of the steel support during later construction is prevented, meanwhile, it is ensured that when mixed support is adopted, the concrete support is pressed at any moment, tensile stress is avoided, and thus concrete is prevented from being pulled and damaged.

Description

technical field [0001] The invention relates to a foundation pit excavation mixed support prestress adaptive automatic compensation device, which belongs to the design part of foundation pit excavation support. Background technique [0002] During the excavation of the foundation pit, especially when the foundation pit is deeply excavated, and when there are high-rise buildings or heavy construction facilities around the foundation pit, the support structure of the foundation pit will be caused during the excavation of the foundation pit. The prestress in the structure causes a large loss, and the supporting structures that have not been specially treated in the past will encounter similar situations. This time, we carefully designed the problem that the traditional support structure cannot perform effective stress compensation in time. This device can automatically compensate for the lost stress in time through high-strength springs during the excavation process of the foun...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D17/04
CPCE02D17/04E02D2250/0046
Inventor 马栋王红伟褚人猛郭志永黄锋罗镇王红杨文志王贤潘英伟魏光全朱继通莫滨
Owner THE FIRST ENG OF CHINA RAILWAY 16TH CONSTR BUREAU GROUP
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