Construction method for synchronously applying prestress to two-way steel supports
A construction method and prestressing technology, applied in excavation, infrastructure engineering, construction, etc., can solve problems such as failure, support system stress overrun, etc., achieve high work efficiency, ensure stability, and avoid differences
Active Publication Date: 2017-03-22
SHANGHAI MECHANIZED CONSTR GRP
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Problems solved by technology
[0005] The above calculation results show that due to the current method of applying prestress one by one, the steel support in the later construction will produce an additional bending moment on the prestressed steel support, and the maximum stress of the corresponding support will increase from 160.5MPa to 391.8 MPa
When the bearing range of the steel support structure is exceeded, the stress of the support system may exceed the limit and fail
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[0014] A construction method for synchronously applying prestress to two-way steel supports proposed by the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. Advantages and features of the present invention will be apparent from the following description and claims. It should be noted that all the drawings are in a very simplified form and use imprecise scales, and are only used to facilitate and clearly assist the purpose of illustrating the embodiments of the present invention.
[0015] The invention provides a construction method for synchronously applying prestress on two-way steel supports, which is applied to the steel support structure of the foundation pit engineering, the steel support of the steel support structure supports the enclosure of the foundation pit engineering, and the The prestressing method includes: Prestressing all steel supports at the same time. These steel supports ca...
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The invention provides a construction method for synchronously applying prestress to two-way steel supports, and is applied to a steel support structure of foundation pit engineering; steel supports of the steel support structure support envelopes of the foundation pit engineering; and a prestress applying method includes synchronous application of the prestress to all the steel supports. The construction method for synchronously applying prestress to the two-way steel supports synchronously applies the prestress to all the steel supports, so that the additional bending moment caused by application of the prestress to the steel supports one by one can be reduced to the greatest extent, the steel support structure is not more influenced by additional stress in the prestress applying process, and the stability of the steel support structure can be effectively guaranteed. The construction method performs unified control for all jacks by a computer automatic control system; on the one hand, the difference on synchronous working of the jacks caused by the difference of manual operation can be prevented; and on the other hand, the working efficiency is higher, and the construction speed is accelerated.
Description
technical field [0001] The invention belongs to the field of building construction and relates to a construction method for synchronously applying prestress to two-way steel supports. Background technique [0002] At present, in building construction, reinforced concrete is used as the horizontal support in the pit for large-scale underground excavation, but this method has high construction costs and cannot be reused, especially after the construction is completed. The demolition workload is heavy, the noise is large, and the pollution is serious , is not conducive to environmental protection. At present, another method is to use steel support as the horizontal support after underground excavation, which overcomes the shortcomings of concrete horizontal support, and has the advantages of reusability and environmental protection. [0003] At present, when a large foundation pit adopts a two-way steel support structure, a load is applied to one end or both ends of each steel...
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IPC IPC(8): E02D17/04
CPCE02D17/04
Inventor 周铮茅翌敏周蓉峰朱骏
Owner SHANGHAI MECHANIZED CONSTR GRP