Construction process of underground diaphragm wall in extra-hard rock

Abstract

The invention relates to a construction process of an underground diaphragm wall in extra-hard rock. The construction process specifically comprises following steps of S1, guide wall construction, wherein cast-in-place concrete is used for making a guide wall of an inverted-L structure; S2, mud preparing and use; S3, grooving construction, wherein during grooving construction, a combination of a hydraulic groove wall machine, a small-opening-diameter drill machine, a rotary drilling rig and a punching pile machine is adopted; S4, groove clearing and mud fluid displacement, wherein an air liftis adopted for groove clearing, after groove clearing, mud not meeting the quality need on the bottom of a groove is subjected to displacement; S5, steel reinforcement cage making and lifting, whereingaps are reserved between a steel reinforcement cage and a groove bottom and between the steel reinforcement cage and a groove top to form protection layers; S6, underwater concrete filling, whereinfilling of the protection layer between the steel reinforcement cage and the groove bottom, underwater concrete casting and filling of the protection layer between the steel reinforcement cage and thegroove top are sequentially finished; and S7, joint treatment between groove segments of an underground diaphragm wall, wherein a joint component formed through splicing of an inverted-L upper frameand an L-shaped lower frame made of steel plates is adopted between the groove segments of the underground diaphragm wall on the open cutting segment to connect adjacent groove segments.

Description

technical field [0001] The invention relates to a construction technology of an underground continuous wall in extremely hard rock, belonging to the field of building construction. Background technique [0002] The underground diaphragm wall has a development history of 60 years and is widely used in deep foundation pit support projects such as housing construction and subways. The underground diaphragm wall is a kind of trenching machine used on the ground for basic engineering. Along the peripheral axis of the deep excavation project, a long and narrow deep trench is excavated under the condition of mud retaining wall. After the trench is cleaned, it is hung in the trench Reinforcement cage, and then use the conduit method to pour underwater concrete to build a unit tank section, and so on section by section, a continuous reinforced concrete wall is built underground, as a water interception, seepage prevention, load-bearing, and water-retaining structure, it has rigidity ...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above-mentioned technical problems, the present invention provides a construction technique for an underground diaphragm wall in extremely hard rock. By changing the construction technology and using a new type of grooving tool, it is solved that the construction of the underground diaphragm wall cannot be carried out normally when encountering extremely hard rock. Leading to problems such as project delays and increased construction costs, improve rock entry efficiency, save construction time, and effectively reduce construction costs

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