Shield tunnel portal strengthening structure

Abstract

The invention belongs to the technical field of tunnel strengthening and particularly relates to a shield tunnel portal strengthening structure. The shield tunnel portal strengthening structure comprises a strengthening structure body. Multiple sets of strengthening plates are arranged on the inner side of the strengthening structure body. Connecting pillars are arranged on the outer side of the strengthening structure body. The strengthening plates are matched with the connecting pillars. The strengthening structure body is provided with a base, and the base is fixedly connected with a hydraulic cylinder. The hydraulic cylinder communicates with a supporting seat. One end of the supporting seat is fixedly connected with the base, and multiple sets of telescopic rods are detachably connected to the other end of the supporting seat. By means of the shield tunnel portal strengthening structure, the limit bearing capability and rigidity of a shield tunnel portal are effectively improved,workers can achieve fast strengthening of a tunnel under rigorous conditions such as narrow space and short allowed strengthening time, the strengthening efficiency of the tunnel portal is improved, the construction period of tunnel portal strengthening work is shortened, the project cost of tunnel strengthening is reduced, and the shield tunnel portal strengthening structure is popularized in a proper range.

Description

technical field [0001] The invention belongs to the technical field of tunnel reinforcement, and in particular relates to a shield tunnel entrance reinforcement structure. Background technique [0002] The shield method is a fully mechanized construction method in the underground excavation method. It is to push the shield machine in the ground, and support the surrounding rock through the shield casing and segments to prevent collapse into the tunnel. A mechanized construction method in which the soil is excavated with a cutting device in front of the excavation face, transported out of the hole by an excavation machine, pushed in by a jack at the rear, and assembled with prefabricated concrete segments to form a tunnel structure. With the continuous popularization of shield tunnels, the construction requirements of shield tunnels are constantly increasing. At the same time, the deficiencies in the actual construction of shield tunnels also need to be improved and resolved ...

AI Technical Summary

Problems solved by technology

However, due to complex underground conditions, changes in groundwater levels and other changes are likely to affect the external load of the shield structure, resulting in deformation of the shield tunnel structure. Considering the aging of materials and structures, the entrance of the shield tunnel often needs to be reinforced. To ensure the normal construction of the tunnel, but the stability of the existing reinforcement structure is poor, and at the same time, the reinforcement work requires a lot of manpower and material resources, which reduces the reinforcement efficiency of the tunnel opening, delays the tunnel construction period, and increases the engineering cost of the tunnel

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