Bearing capacity determination method for concrete filled steel tube lagging jack

A steel pipe concrete and determination method technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problem that the bearing capacity cannot be effectively determined, and achieve scientific and reasonable determination process, controllable calculation error, and reliable calculation results Effect

Active Publication Date: 2015-04-22
SHANDONG UNIV OF SCI & TECH
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Problems solved by technology

[0008] The problem addressed by the present invention is that the core component in the current steel tube concrete arch support technology - the bearing capacity of the steel tube concrete arch cannot be effectively determined, and a method for determining the bearing capacity of the steel tube concrete arch is provided

Method used

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  • Bearing capacity determination method for concrete filled steel tube lagging jack
  • Bearing capacity determination method for concrete filled steel tube lagging jack
  • Bearing capacity determination method for concrete filled steel tube lagging jack

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specific Embodiment approach

[0044] A preferred embodiment of the present invention is:

[0045] 1. Assign initial value

[0046] When the load on the arch frame is unknown, the initial load q 0 It refers to the load applied to the arch during the first step of calculation; the load step Δq refers to the increment of the load applied to the arch during the next step of calculation compared with the previous step of calculation, and the load step The smaller Δq is, the higher the calculation accuracy is; the number of control interfaces t refers to the number of sections taken from the arch, and the calculation result of the internal force of the section is the basic data for judging whether the arch has reached the bearing capacity. The larger the value, the higher the calculation accuracy.

[0047] Apply an initial load q slightly smaller than the yield load to the arch by predicting 0 =90kN / m, Δq=0.1kN / m, t=41. The meaning of the above assignment is that the arch is applied with a uniform load, and ...

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Abstract

The invention discloses a bearing capacity determination method for a concrete filled steel tube lagging jack. The method comprises the following steps: step (1): establishing a mechanical calculation model of the concrete filled steel tube lagging jack, wherein the sections taken from the lagging jack are control sections S and the quantity of the sections S is predetermined as t; step (2): calculating the internal force of the ith control section Si, wherein i is greater than or equal to 1 but less than or equal to t; step (3): judging whether the control section Si of the lagging jack reaches the ultimate bearing capacity or not according to a positively eccentric criterion and a negatively eccentric criterion; and step (4): solving the bearing capacity of the concrete filled steel tube lagging jack, wherein the bearing capacity of the concrete filled steel tube lagging jack is the ultimate bearing capacity of the control section Si firstly emerging on the lagging jack; if the Si reaches the ultimate bearing capacity, the bearing capacity of the concrete filled steel tube lagging jack Qy is Qy=the integral of qyds, and qy is the load on the control section Si.

Description

technical field [0001] The invention relates to a calculation method for the bearing capacity of engineering support structures such as mine roadways, tunnels, hydropower chambers, and subways, and in particular to a method for determining the bearing capacity of steel pipe concrete arch frames. Background technique [0002] With the rapid development of my country's infrastructure construction, more and more projects such as mine chambers, roadways, water conservancy and hydropower, railways, highways, subway tunnels and other projects are facing harsh geological conditions. Taking coal mine roadway engineering as an example, as of the second half of 2013, there have been 47 mines with a mining depth of more than 1000m in my country. After coal mining enters the deep part, the support problem is prominent. The existing anchor net spray support and commonly used high-strength U-shaped steel The support is difficult to meet the safety and use requirements of the roadway. At p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 李为腾梅玉春王书庆张浩杰李建伟
Owner SHANDONG UNIV OF SCI & TECH
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