Cutterhead and cutter reinforcing method for directly cutting reinforced concrete pile foundations by shield

Abstract

The invention belongs to the technical field of shield tunnel construction of city subways, in particular to a cutterhead and cutter reinforcing method for directly cutting reinforced concrete pile foundations by a shield. The method includes the steps of performing nondestructive inspection on a cutterhead, reinforcing rigidity of the cutterhead, modifying a center cutter, additionally arranging center pile cutters, front pile cutters and edge pile cutters, and reinforcing abrasive resistance of the cutterhead. By the method, rigidity and abrasive resistance of the cutterhead can be reinforced, pile cutting capability of a center-cutter region can be improved, and reserved cutting capability of the cutters can be enhanced, so that risks in directly cutting the reinforced concrete pile foundations by the shield are reduced and smooth pile cutting work is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of construction of urban subway shield tunnels, and in particular relates to a method for strengthening a cutter head for shield directly cutting reinforced concrete pile foundations. Background technique [0002] Due to its advantages of safety, speed, low ground settlement, and high degree of mechanization, shield tunneling method is widely used in the construction of rail transit in major cities in my country. With the gradual densification of the rail transit network, it has become increasingly difficult to avoid underground obstacles such as reinforced concrete pile foundations when constructing shield tunnels in central urban areas. Since shield machines generally do not consider the problem of cutting reinforced concrete obstacles when they leave the factory, the cutterhead cutters of conventional shield machines basically do not have the ability to directly cut reinforced concrete pile foundations. T...

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Problems solved by technology

[0005] Aiming at the situation of shield cutting reinforced concrete pile foundation, the existing cutter head modification and strengthening methods were analyzed and summarized, and the following three problems were found: First, only pile cutting tools were added, and the rigidity and wear resistance of the cutter head were not adjusted. Enhanced, and the cutter head is the carrier of the tool, once it undergoes large deformation, wear through or even disintegration, the consequences will be disastrous; 2. The pile cutting ability of the central knife area of ​​the cutter head is not enhanced. In this case On the one hand, it is difficult to cut the middle of the pile foundation, and on the other hand, the center knife is easily worn and severely, resulting in mud cake in the center area of ​​the cutter head; third, when cutting a large-diameter pile foundation, the tool reinforcement measures are weak, the safety factor is low, and the risk high sex

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