Deep foundation pit sliding-falling type rapid pre-supporting system
A technology of pre-supporting and deep foundation pits, which is applied in infrastructure engineering, construction, excavation, etc., and can solve problems such as water leakage, large deformation of milling joints, and poor deformation resistance of milling joints.
Pending Publication Date: 2021-09-10
SHANGHAI TUNNEL ENG CO LTD +1
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Problems solved by technology
[0002]In the construction of ultra-deep foundation pits, concrete support purlins with high rigidity are generally used, and the construction and maintenance time of concrete support purlins is long, resulting in the exposure time of ground walls during excavation Long, large deformation, and ultra-deep foundation pits are often accompanied by ultra-deep ground walls using milling joints. The milling joints have poor deformation resistance. During excavation, once the deformation of the ground wall exceeds a certain limit, the milling joints will leak water, etc. risk
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[0025] Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention.
[0026] Controlling the safety, stability and deformation of deep foundation pit engineering in dense urban areas in soft soil areas, and avoiding the subsidence, cracking and damage of the surrounding environment and facilities due to excessive unloading and deformation of the foundation pit, is an urgent and important research topic for foundation pit engineering. At present, in order to effectively control the rheological displacemen...
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The invention discloses a deep foundation pit sliding-falling type rapid pre-supporting system. The deep foundation pit sliding-falling type rapid pre-supporting system comprises a temporary supporting enclosing purlin provided with a top supporting device; the temporary supporting enclosing purlin applies prestress to a foundation pit through the top supporting device for inner supporting; and the temporary supporting enclosing purlin is further connected with a vertical sliding-falling system and does vertical sliding movement relative to the foundation pit through the vertical sliding-falling system. According to the pre-supporting system, the temporary supporting enclosing purlin and a hydraulic oil cylinder are combined, prestress can be rapidly applied to an underground continuous wall, and ground wall deformation during concrete supporting enclosing purlin construction is reduced; the vertical sliding-falling system is adopted in the pre-supporting system, the sliding-falling type installing manner of the temporary supporting enclosing purlin can be achieved, and rapid deployment can be achieved; and the upper surface of the pre-supporting system serves as a bottom die of the concrete supporting enclosing purlin, and the workload of a common plain concrete bottom die is reduced.
Description
technical field [0001] The invention relates to the technical field of foundation pit support, in particular to a slide-down rapid pre-support system for deep foundation pits. Background technique [0002] In the construction of ultra-deep foundation pits, concrete support purlins with high rigidity are generally used. The construction and maintenance of concrete support purlins takes a long time, resulting in long exposure time and large deformation of the ground wall during excavation. Ultra-deep foundation pits are often accompanied by milling. The ultra-deep ground wall of the joint process has poor deformation resistance of the milling joint. During the excavation process, once the deformation of the ground wall exceeds a certain limit, the milling joint will have risks such as water leakage. [0003] Therefore, it is necessary to develop a fast pre-support system for deep foundation pits, which can be deployed quickly, and provide pre-support in the foundation pit befo...
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IPC IPC(8): E02D17/02E02D17/04E02D5/20B66C25/00
CPCE02D17/02E02D17/04E02D5/20B66C25/00
Inventor 徐辰春何昀黄孝庆朱雁飞罗赛楠陈文礼凌宇锋王吉云夏源思施亚舟王殊阳宿文德侯永茂熊胜成雯桢
Owner SHANGHAI TUNNEL ENG CO LTD