A hoisting method for reinforcement cages of underground diaphragm walls in height-limited areas

Abstract

The invention provides a method for hoisting reinforcement cages of underground diaphragm walls in height-limited areas, which belongs to the field of underground diaphragm wall construction, and includes construction preparation procedures, hoisting procedures, synchronously advancing and lowering reinforcement cage procedures, and welding procedures for openings of reinforcement cages; hoisting procedures It includes the following steps: S31, three cranes are hoisted synchronously until the steel cage is lifted horizontally between 1.5 and 2.0m, the two main cranes continue to lift synchronously, and the auxiliary crane lowers the hook; S32, until the steel cage is completely straightened and After the weight of the steel cage is borne by the two main cranes, the hooks of the auxiliary crane are released; the existing hoisting method solves the problem of many times of hoisting, welding and lengthening, time-consuming, labor-intensive, cost-increased and poor integrity of the steel cage Problems such as the prolongation of the installation time of the reinforcement cage and the increase of the exposure time of the groove wall are too long, and the phenomenon of collapse of the groove wall, mud inclusion in the cage body, excessive sediment, etc. is easy to occur, which is unfavorable to the control of the construction quality of the underground diaphragm wall.

Description

technical field [0001] The invention relates to the construction field of an underground diaphragm wall, in particular to a method for hoisting a reinforcement cage of an underground diaphragm wall in a height-limited area. Background technique [0002] Such as figure 1 As shown, in the construction process of the underground diaphragm wall, under normal circumstances, the reinforcement cage of the wall is integrally manufactured and hoisted into the groove at one time, and the reinforcement cage is hoisted using hooks, shoulder poles, wire ropes and other spreaders 3, usually with a height of about 3.5m . [0003] However, when the construction site is affected by the high-voltage line 1 and is in the height-limited area 2, and the hoisting height on the site is insufficient, the reinforcement cage 4 is made in sections, and the segmented reinforcement cage 4 is connected by welding during hoisting to ensure continuous The integrity of the wall reinforcement. [0004] Th...

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Problems solved by technology

[0005] 1. Many times of hoisting, welding and lengthening, time-consuming and labor-intensive, increased cost and poor integrity of the reinforcement cage 4;

[0006] 2. If the reinforcement cage 4 is placed for a long time, the exposure time of the groove wall will increase if it is too long, and it is easy to cause the collapse of the groove wall, mud in the cage body, excessive sediment, etc., which is unfavorable for the control of the construction quality of the underground diaphragm wall.

[0007] For example, in the construction of an underground diaphragm wall in a project in Shenzhen, the high-voltage wires on the wall are located at a height of 12m above the ground. According to the requirements of the specification, a safety distance of 5m must be ensured for hoisting operations below the high-voltage wires. The traditional segmented hoisting tool 3 occupies a space of 3.5m. Then the section length that can be manufactured by the theoretical reinforcement cage 4 is only 3.5m

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