Lining wall concrete placement top-down method based on underground diaphragm wall

Abstract

The invention relates to a lining wall concrete placement top-down method based on an underground diaphragm wall. The lining wall concrete placement top-down method comprises the following steps: (1) the underground diaphragm wall is constructed; (2) a foundation floor slab is constructed; (3) an upper floor slab is constructed; (4) a formwork is erected, an upper layer of lining wall concrete is poured, a steel pipe is pre-buried every 2-3 meters in the upper layer of lining wall concrete, and the lower end of each pre-buried steel pipe is arranged on the top of an inverted groove in the lower portion of an upper lining wall which is formed in a pouring mode; (5) a lower lining wall formwork is erected, wherein the formwork is directly connected with the upper lining wall from the bottom surface of the foundation floor slab and is mounted in a closed mode, pump truck concrete delivery pipes used for pouring a lower layer of lining wall concrete are inserted in the pre-buried steel pipes to conduct pouring continuously, the concrete is compacted by means of vibration, a micro-expanding agent is added into the concrete, and then pouring of the lining wall concrete is completed. The lining wall concrete placement top-down method based on the underground diaphragm wall is simple in operation process, can sufficiently guarantee that the concrete poured in the lining walls later is compact, accelerates construction progress, and improves construction efficiency.

Description

technical field [0001] The invention belongs to the field of concrete pouring for inner lining walls, in particular to a reverse operation method for pouring inner lining wall concrete based on an underground continuous wall. Background technique [0002] In the construction of deep foundation pits in the field of construction, underground diaphragm walls are often used as enclosure structures, and lining walls are constructed inside them to become the exterior walls of underground works. Sometimes the lining wall and the underground structure are constructed by the reverse method. The method of pouring the concrete of the lining wall is usually: after the construction of the foundation below is completed, the side formwork of the supporting wall is installed, and there is a gap between the formwork and the poured lining wall above. Set a certain space, pick out the formwork obliquely to make a funnel shape, and then pour concrete. The pouring process of this method is comp...

AI Technical Summary

Problems solved by technology

The pouring process of this method is complicated, and the concrete that protrudes from the wall must be chiseled after the formwork is removed. At the same time, there is a vibrating blind area at the junction of the new concrete poured by this method, and the air is not easy to discharge, forming voids and causing water seepage.

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