Functional gradient material interface enhancing technology for shield driven tunnel concrete pipe sheet

Abstract

The present invention relates to a functional gradient material interface reinforcing process for shield tunnel concrete segment. The contact face of the reinforced concrete structure layer and high-impervious protecting layer of shield tunnel concrete segment is the functional gradient material interface, and is characterized by that said interface reinforcing process includes the following several steps: 1), in reinforced concrete segment steel mould pouring high-performance concrete whose strength grade is greater than C50 so as to form reinforced concrete structure layer; 2), making functional gradient material interface reinforcing treatment: on the upper surface of the reinforced concrete structure layer stamping embedded polygonal interface, the included angle of polygonal line of embedded polygonal interface and horizontal plane is 15-65deg; 3), on the embedded polygonal interface adopting pumping process to pour high-performance fine aggregate concrete to upper surface of reinforced concrete segment steel mould so as to form high-impervious protecting layer.

Description

technical field [0001] The invention relates to a process for strengthening the interface of a shield tunnel concrete segment with a functional gradient material. Background technique [0002] Since the 1960s, the shield tunnel lining structure has gradually popularized and applied assembled reinforced concrete segments. Reinforced concrete segments have a certain strength and are relatively easy to process and manufacture. When steel molds are used (single block production), the accuracy of the segment can be guaranteed (at home and abroad, it can reach ±0.5mm), corrosion resistance, and low cost. At present, it is the most commonly used in China. . However, there are also many shortcomings in engineering applications, such as: large shrinkage deformation, easy to crack, poor waterproof and durability, and fire resistance performance is not considered. Therefore, it is particularly important to optimize the design of concrete segment materials and improve their engineerin...

AI Technical Summary

Problems solved by technology

[0005] The introduction of functionally graded materials into the design of concrete segments of underground tunnels has not been reported in China at present, and there are considerable gaps in the technology and patents of the strengthening of the interface transition zone of functional materials and construction techniques. Therefore, through systematic research, the establishment of The design theory of functionally graded tunnel segment materials with independent intellectual property rights in my country and the related interface strengthening technology are crucial and imperative

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