A tongue-and-groove connection mechanism and construction method for underground diaphragm wall and underwater concrete

Abstract

The invention discloses a rabbet connecting mechanism for an underground diaphragm wall and underwater concrete. The rabbet connecting mechanism comprises a rabbet groove, a slurry sealing mesh and a traction rope. The rabbet groove comprises a side plate and two wing plates. The rabbet groove is fixedly connected with diaphragm wall reinforcement cage main ribs. The side plate is provided with a penetrating hole. The two wing plates of the rabbet groove are connected with the slurry sealing mesh. The slurry sealing mesh is connected with one end of the traction rope, and the other end of the traction rope passes through the penetrating hole and stretches out of the ground. The invention further discloses a rabbet connecting construction method for the underground diaphragm wall and the underwater concrete. The method comprises the steps that the rabbet groove is manufactured; the slurry sealing mesh is manufactured; the rabbet groove is fixedly connected to the diaphragm wall reinforcement cage main ribs; after a diaphragm wall reinforcement cage is arranged in place, the traction rope is pulled to enable the slurry sealing mesh to tilt and to be obliquely erected on a diaphragm wall guide groove wall; the diaphragm wall concrete is poured; and bottom sealing is conducted on the underwater concrete. No filler needs to be embedded in the rabbet groove, effective connection between the diaphragm wall and the underwater concrete is achieved, meanwhile, construction procedures are simplified, and the labor cost is saved.

Description

technical field [0001] The invention relates to the technical field of underground space building construction, in particular to a tongue-and-groove connection mechanism between an underground diaphragm wall and underwater concrete and a construction method. Background technique [0002] With the development of cities, the depth of underground works is getting bigger and bigger, and it is more and more common for structures to be located in highly permeable strata. Considering the difficulty and high cost of precipitation construction and the urgent need to protect water resources, more and more projects adopt the water-stop solution of underwater excavation and underwater concrete bottom sealing. In order to reduce the thickness of the underwater back-sealing concrete and save the cost, an underground diaphragm wall is often set under the underwater concrete, and the two jointly resist the water pressure. [0003] In the joint design of underground diaphragm wall and under...

AI Technical Summary

Problems solved by technology

[0003] In the joint design of underground diaphragm wall and underwater concrete, there are two ways to deal with it: one is not to set grooves, and only the friction force at the interface between underground diaphragm wall and underwater concrete is considered in the calculation, but the interface friction force is affected by the construction quality. The impact is great, the friction coefficient is often difficult to determine, and there is a large uncertainty. In addition, due to the limited friction, in order to ensure reliable connection, it is often necessary to increase the thickness of underwater concrete or the number of underground diaphragm walls, which is less economical; In the mouth groove, vinyl blocks or inflatable air bags are pre-embedded in the groove. After underwater excavation to the bottom, the filler will be cleaned by divers underwater.

The method of setting the groove is limited by the material of the filling material is easy to break, it is difficult to fix, and the later protection and cleaning are difficult. In addition, if the filling is broken, it will enter the interior of the underground diaphragm wall, directly reducing the limited section of the underground diaphragm wall. It is very unfavorable to pile stress and leakage water treatment

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