New and old diaphragm retaining wall port treatment structure and treatment method thereof

Abstract

The invention discloses a new and old diaphragm retaining wall port treatment structure and relates to the field of foundation pit engineering. The new and old diaphragm retaining wall port treatmentstructure comprises a lengthening section underground diaphragm wall, a new underground diaphragm wall and an old underground diaphragm wall, wherein one end of the lengthening section underground diaphragm wall is connected with the new underground diaphragm wall; the other end of the lengthening section underground diaphragm wall is in contact with the old underground diaphragm wall; and a grouting pipe is arranged at the contact part of the lengthening section underground diaphragm wall and the old underground diaphragm wall. According to the new and old diaphragm retaining wall port treatment structure, the lengthening section underground diaphragm wall is newly built near the joint of the new underground diaphragm wall and the old underground diaphragm wall, the grouting pipe is additionally arranged at the joint, and foundation pit excavation is carried out after grouting, so that the joint waterstop effect is improved to ensure construction safety of foundation pit excavation through an artificially lengthened by-pass seepage passage and grouting reinforcement.

Description

Technical field [0001] The invention relates to the field of foundation pit engineering, more specifically it is a new and old ground connecting wall interface processing structure. The invention also discloses a processing method of this processing structure. Background technique [0002] According to the "Technical Regulations for Building Foundation Pit Support" JGJ120-2012, the definition of foundation pit support is as follows: In order to protect the safety of the underground main structure construction and the surrounding environment of the foundation pit, temporary support, reinforcement and protection of the foundation pit are adopted And groundwater control measures. Whether the excavation of the foundation pit adopts a supporting structure and what kind of supporting structure should be adopted according to the surrounding environment of the foundation pit, the excavation depth of the foundation, engineering geology and hydrogeological conditions, construction conditi...

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Problems solved by technology

Therefore, when the underground water level is high and the ground conditions are poor in the geological environment of the underground project, the underground diaphragm wall is often used as the support structure of the foundation pit. However, due to various factors, the original underground diaphragm wall cannot reserve an interface for the subsequent underground diaphragm wall. Therefore, the joints between the old and new underground continuous walls must be treated, otherwise water and sand leakage will easily occur during the excavation of the foundation pit, endangering the safety of various surrounding buildings and the safety of the foundation pit itself

[0007] For the joint treatment of the new and old underground diaphragm walls, at present, on the soil facing side of the foundation pit joint, grouting or high-pressure rotary grouting piles are generally used for soil reinforcement. This method has the possibility that the ground operation conditions may be restricted by the surrounding pipelines, soil Unfavorable factors such as unfavorable control of body reinforcement quality and high investment costs

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