Fire damage test device for shield tunnel segment structure in bearing state

Abstract

The invention relates to a fire damage test device for a shield tunnel segment structure in a bearing state, and the device comprises a furnace body, a furnace body temperature control system, a horizontal mechanical loading device for applying a horizontal force to a test segment, and a vertical mechanical loading device for applying a vertical force to the test segment. Two sides of the test segment are respectively supported on the horizontal mechanical loading device and are respectively contacted with the horizontal mechanical loading device, the vertical mechanical loading device is positioned on the test segment and is contacted with the upper end of the test segment, the upper part of the furnace body is opened, and the test segment is positioned at the upper opening of the furnace body. The temperature and the load are effectively controlled through the mechanical loading device and the temperature control system, different working conditions in the tunnel construction operation period are truly simulated, and the temperature in the furnace is accurately controlled in real time, so that the test device can be used for researching tunnel lining rules under different load environment conditions, different structure lining types and different fire temperatures.

Description

technical field [0001] The invention relates to a prototype segment fire damage test device, in particular to a shield tunnel segment structure fire damage test device in a bearing state. Background technique [0002] In the existing concrete fire resistance tests, the concrete test block is generally used to test the performance degradation law after high temperature damage, which cannot simulate the long-term exposure of the underwater test segment lining structure in the actual tunnel service environment from the surrounding environment. The load and water pressure of the formation have a great influence on the performance of the segment lining structure. However, various studies on fire at present have shown that the fire under load will cause greater damage to the structure. Therefore, the existing concrete fire resistance test cannot carry out the fire resistance test under load, and it cannot truly simulate the real environment when the tunnel fire occurs, which is n...

AI Technical Summary

Problems solved by technology

[0002] In the existing concrete fire resistance tests, the concrete test block is generally used to test the performance degradation law after high temperature damage, which cannot simulate the long-term exposure of the underwater test segment lining structure in the actual tunnel service environment from the surrounding environment. The situation where the load and water pressure of the ground have a great influence on the performance of the segment lining structure

However, various current studies on fires have shown that fires under loads cause greater damage to structures

Therefore, the existing concrete fire resistance test cannot carry out the fire resistance test under load, and it cannot truly simulate the real environment when the tunnel fire occurs, which is not conducive to the study of the temperature field distribution law, fire resistance limit and deformation of the overall structure under the fire condition of the lining structure Features, degradation law of each part

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