Load-carrying capacity test device of tunnel secondary-lining concrete structure

Abstract

The invention relates to a load-carrying capacity test device of a tunnel secondary-lining concrete structure, comprising a pressure box, a hook, a hanging rod, a spring balance, a stack loading platform and a stress strain meter, wherein the pressure box is fixedly buried between a tunnel waterproof layer and the secondary lining concrete, the hook is fixed on the secondary lining concrete, the hook is connected with the hanging rod, the hanging rod is connected with the stack loading platform through the spring balance, the stress strain meter is arranged on the surface of the secondary lining concrete, the stack loading platform is loaded step by step to obtain the data of each instrument, the actual measurement valve and the theoretical calculation value are compared, and the load-carrying capacity of the secondary lining concrete is illustrated through a linear curve. The device can effectively test and detect the load-carrying capacity of a tunnel secondary lining concrete structure and is a lossless test and detection device, does not destroy the original tunnel secondary lining concrete structure and can provide important scientific evidences for design, construction and construction completion acceptance.

Description

technical field [0001] The invention relates to the field of quality control of tunnel secondary lining concrete, in particular to a test device for the bearing capacity of tunnel secondary lining concrete structure. Background technique [0002] At present, in highway, railway, municipal, water conservancy and other projects, the tunnel is a common structure, and the secondary lining concrete structure is the main structure of the tunnel. Now the conventional design method of the secondary lining concrete structure is to use the analogy method to design, and then Checked through theoretical calculations or verified by indoor model tests, but due to the complex geological conditions and frequent changes in the surrounding rock of the tunnel, it is difficult to accurately determine the geological parameters of theoretical calculations or indoor models, resulting in a large discrepancy between theoretical calculations or indoor model test results and actual conditions. Large, ...

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Problems solved by technology

[0002] At present, in highway, railway, municipal, water conservancy and other projects, the tunnel is a common structure, and the secondary lining concrete structure is the main structure of the tunnel. Now the conventional design method of the secondary lining concrete structure is to use the analogy method to design, and then Checked through theoretical calculations or verified by indoor model tests, but due to the complex geological conditions and frequent changes in the surrounding rock of the tunnel, it is difficult to accurately determine the geological parameters of theoretical calculations or indoor models, resulting in a large discrepancy between theoretical calculations or indoor model test results and actual conditions. Large, can not reflect the actual project

At the same time, the construction quality of the primary support of the tunnel and the on-site pouring of the secondary lining concrete is also difficult to guarantee. It is precisely because there is currently no effective bearing capacity test device for the secondary lining concrete structure of the tunnel on site, and its bearing capacity cannot be tested. The designs are relatively conservative, resulting in huge waste

During the quality inspection and acceptance, its bearing capacity cannot be tested. Once the construction is completed, if there are quality problems, it will not be found, and safety hazards cannot be eliminated. This is one of the main reasons for the frequent occurrence of tunnel safety accidents.

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