Method for connecting slotted sections in underground construction of diaphragm wall

Abstract

The invention discloses a method for connecting slotted sections in underground construction of diaphragm wall of 'deep wall, large thickness and needing rock-socketed' applied to large acale bridges and construction foundation pit excavation. The method comprises the following steps: establishing a guide wall and a construction platform; constructing I phase slotted section of the diaphragm wall; constructing of a slotted eye of II phase slotted section of the diaphragm and jagged section surface of the I phase slotted section; forming an underground diaphragm wall; cleaning and brushing the wall of the II phase slotted section repeatedly up and down by a special steel brush carried by a hydraulic grab, until the steel brush does not have obvious spare, deposit on the bottom of the eye does not increase; releasing a reinforcing cage and casting concrete so as to complete the connection of I phase slotted section and II phase slotted section after the II phase slotted section is completed; forming a complete diaphragm wall after connection. After the method is adopted, the progress of the construction of the underground diaphragm wall is greatly improved; construction cost is saved; construction problems, such as concrete circumferential motion prevention, water seepage in seam and the like can be completely solved by the jagged connection section so as to improve construction quality and safety reliability.

Description

technical field [0001] The invention relates to a construction method of an underground diaphragm wall in the excavation of large bridges and building foundation pits, in particular to an underground diaphragm wall construction groove for large bridges and buildings with "deep walls, large thickness, and rock insertion" method of linking segments. Background technique [0002] The traditional commonly used joint types of underground diaphragm walls mainly include drilling connection, joint pipe connection, water-stop structure and rigid connection structure in the joint, etc. Among them, the joint pipe method is the most common method. When this method is used, it is difficult to pull out the lock pipe of the ultra-deep underground diaphragm wall. According to preliminary empirical estimates, in an ideal vertical state, the sum of the self-weight of the locking tube and the frictional resistance of the side wall that needs to be overcome when pulling out the locking tube is...

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Problems solved by technology

According to preliminary empirical estimates, in an ideal vertical state, the sum of the self-weight of the locking tube and the frictional resistance of the side wall that needs to be overcome when pulling out the locking tube is more than 600 tons. The test of the bearing capacity of the wall is quite large. Due to the welding quality of the pipe body material or the insufficient strength of the back seat of the guide wall, the risk of the lock pipe being pulled out or the pipe buried will be greatly increased. Therefore, due to the factor of the large wall depth , for the construction of ultra-deep rock-socketed underground diaphragm wall, it is very difficult to pull out the pipe, and a guide wall with high rigidity is needed, and it is often difficult to pull out the pipe due to reasons such as the time of pulling out the pipe, the construction plan, and the pulling out machine, which affects the construction quality and causes concrete damage. Due to construction phenomena such as anti-circumvention and joint water seepage, the conventional underground diaphragm wall joint construction method is complex in construction, long in construction period, poor in quality, and difficult to guarantee safety, which directly restricts the popularization and application of underground diaphragm wall foundations in large bridges and other foundations.

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