Subway foundation pit anchor rope processing method

Abstract

The invention discloses a subway foundation pit anchor rope processing method. The subway foundation pit anchor rope processing method is characterized by adopting a construction scheme of carrying out high-pressure rotary-spraying strengthening on slot walls of an underground continuous wall and directly breaking an anchor rope in a grabbing mode by a hydraulic slot-forming machine; measures of isolating insertion type steel in high-pressure rotary-spraying piles are taken before processing the anchor rope and processing a waste sewage pipe, so that optimal configuration of engineering resources is realized; meanwhile, in order to reduce collapse of the slot walls during the anchor rope processing period, two rows of high-pressure rotary-spraying piles are arranged at the two sides of each slot wall of the underground continuous wall within an anchor rope influence range to carry out ground-layer strengthening; cement content within the straightened regions of the high-pressure rotary-spraying piles is not smaller than 30%; the slot-forming machine is adopted to carry out foundation pit slot excavation on the ground layers of the slot walls at the two sides of the underground continuous slot wall, so that the anchor rope is processed in layers and in sections; and during foundation pit slot excavation, the anchor rope is ensured to be sheared off or broken by a hydraulic grab bucket of the slot-forming machine, and finally, the foundation pit slot is backfilled; and the safety of subway foundation pit construction is effectively protected, and the overall plan is economical.

Description

technical field [0001] The invention relates to the technical field of anchor cable processing, in particular to a method for processing anchor cables in subway foundation pits. Background technique [0002] The proposed construction site of Hongguzhong Avenue of Nanchang Rail Transit Line 2 is located at the intersection of Hongguzhong Avenue and Chunhui Road, along Chunhui Road from northwest to southeast; the north of the station is Shimao Real Estate, and the south is International Finance Center and Nanchang Daily Newspaper Building, Hongkelong Department Store to the southwest, and Sheraton Wall Street Plaza Hotel under construction to the east; Hongguzhong Avenue Station is an island-style station with three floors underground, the center mileage is YDK33+488, and the starting and ending mileage interval is YDK33+422.286~YDK33+ 566.186; the total length of the station is 143.9m, of which the standard section is 61.6m long, 21.9m wide, and 22.96m deep; the end well is ...

AI Technical Summary

Problems solved by technology

[0019] Through the analysis of the water quality of Hongguzhong Avenue Station, it is planned to evaluate according to the type II environment, and the groundwater of the proposed site is slightly corrosive to the concrete structure; according to the permeability evaluation of the A-type formation, the groundwater is slightly corrosive to the concrete structure; Under certain conditions, it is corrosive to concrete structures and steel bars; when the prestressed anchor cable adopts 1860MPa high-strength steel strand, the design tension is 400KN, the locked load is 350KN, and the anchorage section is 18m long. The grout volume in some areas is 4-5 times larger than the designed grout volume, and there are "mushroom heads", which seriously affect the normal operation of the station

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