Device and method for testing contact stress between shield tunnel segments

Abstract

The invention relates to a device and a method for testing contact stress between shield tunnel segments, and the device comprises: a piezoelectric air pressure sensor which is packaged in a rubber film, wherein the rubber film is provided with an air hole and an air valve; a limiting frame which is tightly connected with the rubber film, limits the expansion direction of the rubber film and only allows the rubber film to expand in the thickness direction of the sensor; and a flat wire, wherein one end of the flat wire penetrates through the rubber film to be connected with the piezoelectric air pressure sensor, the other end of the flat wire is connected with a data collector, and the data collector transmits piezoelectric signals to a data center through a data transmission device. The piezoelectric air pressure sensor, the rubber film, the limiting frame and the flat wire jointly form an embedded piezoelectric sensor. According to the device, the contact stress between the shield tunnel segments can be visually and accurately measured, the method is used for detecting the splicing quality of the built shield tunnel segments, meanwhile, in the construction stage, the built shield tunnel interval is measured, and shield tunnel construction is assisted and guided.

Description

technical field [0001] The invention relates to the field of health monitoring of shield tunnels, in particular to a test device and a test method for contact stress between shield tunnel segments, which are applied to the assembly quality detection of completed subway shield tunnels and cross-river shield tunnels. Background technique [0002] With the rapid development of modern industry and the continuous expansion of urban scale, the urban population has increased sharply, and rail transit projects have become the backbone of public passenger transport networks in large and medium-sized cities. In the construction of urban rail transit intervals, the shield method is the most widely used construction method. It has the advantages of not being restricted by the terrain environment, fast underground excavation, small surface area and almost no impact on ground traffic. [0003] During the construction of the shield tunnel, the assembly quality of the segments affects the q...

AI Technical Summary

Problems solved by technology

Poor quality of segment assembly will lead to serious problems such as water leakage in the tunnel, local segment damage due to excessive force, and grease consumption caused by extrusion damage of the shield tail brush of the shield machine.

However, in the shield tunneling process of subway construction, there are often problems with excessive deviation of segment assembly. Therefore, in order to minimize the adverse effects caused by segment assembly quality problems, corresponding countermeasures must be taken to strictly control them.

[0004] After retrieval of patents in related fields, there is a method of arranging pressure sensors between shield tunnel gaskets, which can be used to detect the assembly quality of shield tunnels, but this method is only applicable to tunnels under construction. When the tunnel is completed, the shield tunnel Sensors can no longer be placed between the tunnel gaskets, and they cannot be used to detect the assembly quality of the completed tunnel segments. At the same time, it is difficult to verify whether this method will affect the water-tight performance of the shield tunnel.

[0005] At present, a large number of completed shield tunnels have the problem of poor segment assembly quality. For the completed shield tunnels, the current methods of detecting assembly quality are manual inspection and 3D scanning, which can only detect the segment assembly quality from the appearance. There is an urgent need for a measurement method that can detect the contact stress between the completed shield tunnels, so as to judge the assembly quality of the shield tunnels and take corresponding measures

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