Construction method for directly cutting guard post for tunnel end well by shield machine

Abstract

The invention discloses a construction method for directly cutting a guard post for a tunnel end well by a shield machine. A reinforcement body in the guard post consists of an upper steel reinforcement cage, a lower steel reinforcement cage and a middle FRP reinforcement cage, wherein the position of the middle FRP reinforcement cage corresponds to the position of the tunnel end well for the shield machine to access. The construction method comprises the following steps: hoisting, lapping and binding the lower steel reinforcement cage, the middle FRP reinforcement cage and the upper steel reinforcement cage in turn, and then inserting a conduit into the bound reinforcement cages to pour concrete so as to form a guard post structure of the tunnel end well; and when the shield machine tunnels to the position of the end well, firstly exchanging a cutter head of the shield machine into a hob, a serrated knife or a scraper, and then cutting the guard post. The construction method overcomes the defects of the prior construction method such as high expense, long period, large construction difficulty and the like, avoids chiseling a reinforced concrete guard at a corresponding position by using a manual softening method so as to improve the safety, and has the advantages of short period, low manufacturing cost and high safety.

Description

technical field [0001] The invention relates to an underground structure construction method, in particular to a construction method in which a shield machine enters and exits a tunnel end well and directly cuts the surrounding protection piles of the tunnel end well. Background technique [0002] At the end wells (such as subway stations) of tunnels such as subways, underground tunnels, and cable channels, reinforced concrete structures are currently used as the support of foundation pits to achieve the purpose of retaining soil and water. In shield tunnel construction, when the tunnel is excavated to the position of the end well, it is extremely difficult to directly cut the reinforced concrete support structure with the cutter of the shield machine, and it is easy to cause problems such as cutter damage and steel bar jamming. In order to facilitate the entry and exit of the shield machine into and out of the head well, the reinforced concrete enclosure at the correspondin...

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Problems solved by technology

[0005] The purpose of this invention is to solve the above technical deficiencies, overcome the shortcomings of traditional construction methods such as high cost, long period, and diffi

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