Scaffold Test Method in Pilot Tunnel Excavation Process
A test method and scaffolding technology, which is applied in the testing of mechanical components, testing of machine/structural components, and the use of stable tension/pressure to test the strength of materials, etc. Unpredictable frame failure and other issues, to achieve the effect of providing safety and reducing construction costs
Active Publication Date: 2021-04-09
中煤建工集团有限公司
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Problems solved by technology
[0005] The present invention aims to solve at least one of the technical problems existing in the prior art or related technologies: the damage caused by the impact of the surrounding rock pressure on the scaffold during the excavation of the pilot tunnel cannot be predicted, which affects the support stability of the scaffold to the pilot tunnel
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[0031] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.
[0032] During the excavation of the pilot tunnel, the top scaffolding is firstly used to support the top of the cave body to prevent construction accidents such as collapse. The top scaffolding needs to meet the structural requirements such as strength and rigidity to achieve the supporting function. However, at present, most of the structural strength of the scaffolding is obtained through structural calculation or construction experience. There is no test and verification process for the actual stress state of the scaffolding, and there may be waste of scaffolding structural strength or the scaffolding structure cannot meet the requirements. Support stability requirement...
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The invention relates to the field of engineering construction, and provides a scaffold test method in a pilot tunnel excavation process. The test device is set up: the flat roof scaffold is supported and fixed, the lower part of the flat roof scaffold is supported by a prefabricated support, and the flat roof scaffold and the prefabricated support are arranged. The pressure-bearing height-adjusting force-measuring device, the pressure-bearing height-adjusting force-measuring device has the functions of pressure-bearing height adjustment and multi-directional force measurement; loading process: the preset pressure is loaded on the flat-top scaffolding, and at the same time, the pressure-bearing height-adjusting force-measuring device provides support Force, the initial support force is the same as the pressure carried by the flat-roof scaffolding, but in the opposite direction; unloading adjustment: the support force provided by the pressure-bearing and height-adjusting force-measuring device at the target position is adjusted according to the law of the surrounding rock load release. The invention provides a scaffolding test method in the pilot tunnel excavation process, which can accurately obtain the stress deformation state of the scaffolding under the surrounding rock pressure in different excavation processes and excavation stages, and is used to guide the structural design and remedy of the scaffolding Repair, effectively reduce the construction cost.
Description
technical field [0001] The invention relates to the field of engineering construction, in particular to a scaffold test method in a pilot tunnel excavation process. Background technique [0002] With the rapid development of my country's infrastructure construction, a large number of tunnels have been excavated, and the geological conditions encountered in the process of tunnel excavation have become increasingly complex, and the overall tunnels have shown a development trend of "many, long, large, and deep". During the excavation of the tunnel, the underground structure is damaged, and the underground structure has the problems of hidden damage and difficult repair. Therefore, in the process of underground construction, it is necessary to do a good job of supporting work, but the requirement for supporting strength is high, and the construction cost will increase accordingly. Therefore, in order to ensure the strength of the support and reduce the construction cost, it is n...
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IPC IPC(8): G01M13/00G01N3/08
Inventor 陈向红袁鹏郭俊杰
Owner 中煤建工集团有限公司