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Hoop type adjustable head used for inner support of foundation pit engineering and construction method thereof

A technology of flexible joints and flanges at hoops, applied in infrastructure engineering, excavation, construction, etc., can solve problems such as unreliable force transmission and poor integrity of steel support systems, and achieve easy quality control, construction safety, and overall assurance sexual effect

Inactive Publication Date: 2014-01-29
BEIJING UNIV OF TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] Based on the above problems, the present invention proposes a hoop-type active joint for internal support of foundation pit engineering and its construction method, which solves the problems of poor integrity and unreliable force transmission of the current steel support system. The friction force and bite force between the hoop and the inner tube are used to bear and transmit the axial force of the steel support

Method used

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  • Hoop type adjustable head used for inner support of foundation pit engineering and construction method thereof
  • Hoop type adjustable head used for inner support of foundation pit engineering and construction method thereof
  • Hoop type adjustable head used for inner support of foundation pit engineering and construction method thereof

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[0042] Through the following example, such as Figure 1-15 Shown, the present invention is further described.

[0043] Design description, a hoop-type active joint used in the support of foundation pit engineering according to the present invention, the maximum axial force of the steel support is designed to be 2000kN, and the safety factor is 1.5, so as to provide a certain safety reserve and prevent accidental loads and excessive ground deformation. And other accidents cause engineering accidents. Including hoop 1 and inner pipe 2; hoop 1 is mainly composed of thick-walled steel pipe I, hoop wing plate 8, flange 6 at the hoop, and jack tray 9, and flange 6 at the hoop is welded at one end of thick-walled steel pipe I ; On both sides of the cross section of the thick-walled steel pipe I, a jack tray 9 is symmetrically arranged on the left and right, and the jack tray 9 is welded to the thick-walled steel pipe I and the flange 6 at the hoop respectively; The hoop wing plates...

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Abstract

The invention relates to a hoop type adjustable head used for an inner support of foundation pit engineering and a construction method thereof. The hoop type adjustable head can be arranged at any position of a steel support; the principle is that two synchronous jacks apply additive axial forces, a nick is machined in the inner side of the hoop, the axial forces are borne and transferred through the utilization of a friction force and an occlusion force between a hoop and an inner pipe, and the force transfer way is reliable. The adjustable head comprises the hoop and the inner pipe, wherein two jack trays are symmetrically welded at the left and the right of a hoop flange, hoop wing plates are welded at the upper side and the lower side, and high-intensity bolts are mounted. According to the invention, the problems of poor integrity and unreliable force transfer of the existing steel support system are solved efficiently, the construction safety is improved, strong operability, safe and fast construction and convenient detachment are achieved, the hoop type adjustable head can be used repeatedly, the unsafe method of driving a steel wedge in the steel support adjustable head to bear and transfer the axial forces via a point contact way is replaced, and promotional values and development foreground are achieved.

Description

technical field [0001] The invention relates to a hoop-type active joint used for internal support of foundation pit engineering and a construction method thereof, which is used for applying pre-loaded axial force to steel supports, and belongs to the technical field of internal support of foundation pit engineering. Background technique [0002] Steel supports for foundation pits are widely used in the construction of open excavation methods in subway stations. During the installation of steel supports, the application of pre-loaded axial force is of great significance for controlling the horizontal displacement of the ground. At present, the pre-loaded axial force of steel supports is supported by double-cylinder jacks The active head of the single-cylinder jack or the active head of the single-cylinder jack. In these two methods, after the pre-loaded axial force is applied by the jack, the steel wedge is driven in, and the jack is removed after being stabilized. The disa...

Claims

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Application Information

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IPC IPC(8): E02D17/02E02D17/04
Inventor 张明聚赵鸿超郭雪源宋轶骏
Owner BEIJING UNIV OF TECH
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