A kind of pretreatment method of anchor cable group passing through shield tunneling section

Abstract

The invention discloses a pretreatment method for an anchor cable group penetrating through a shield driving fracture surface. The pretreatment method comprises the steps of adopting a warehouse-jumping method to construct an artificial wellhole of a preorder; arranging a working platform at a position where the anchor cable can be found, cutting off the anchor cable, and arranging a removing tool on the working platform; adopting the removing tool to loosen and drag out the anchor cable; backfilling the artificial wellhole and recovering the ground; adjusting the orientation and the diameter of the artificial wellhole of a postorder according to the residual anchor cable condition of the artificial wellhole of the preorder, but guaranteeing that a plum blossom connection is formed between the artificial wellhole of the preorder and the artificial wellhole of the postorder; repeating the steps above until all the anchor cables are removed. The pretreatment method adopts the warehouse-jumping method to dig the artificial wellhole and has a flexible hole arrangement, therefore, not only is construction area reduced, but also construction speed is improved; plum blossom connections are adopted between a number of artificial wellholes, continuous construction regions are formed on a shield path so as to ensure that all the anchor cables can be removed. The pretreatment method for the anchor cable group which passes through the shield driving fracture surface belongs to the field of anchor cable removing.

Description

technical field [0001] The invention relates to the field of anchor cable removal, in particular to a pretreatment method for anchor cable groups passing through a shield excavation section. Background technique [0002] With the rapid development of urban construction, more and more tunnels are built using shield technology. The underground situation is very complicated, and there are various obstacles that need to be dealt with during the construction of the shield tunneling section. The handling of anchor cables has brought great difficulties to the construction. [0003] The common methods for dealing with the anchor cables mainly include the follow-up extraction method of the casing of the drilling machine after slotting, and the method of cleaning the underground excavation tunnel. [0004] Follow-up extraction method of drilling rig casing after slotting: the site occupation area and earthwork excavation volume are large, and it is impractical to adopt this method in...

AI Technical Summary

Problems solved by technology

Underground tunnel cleaning method: severely restricted by geological conditions, and a temporary shaft needs to be constructed as an entrance, high cost, high risk, and long construction period

[0005] The available space on the ground of urban tunnels is limited, the pipelines are intricate, and the conventional treatment methods are difficult to apply. Therefore, it is extremely necessary to study the pretreatment methods suitable for the anchor cable groups in the excavation section of urban shield tunnels.

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