Automatic tunnel inverted arch impact model system

Abstract

The invention provides an automatic tunnel inverted arch impact model system. The automatic tunnel inverted arch impact model system includes an impact device and an impact model test groove; the impact device comprises a bracket, a driving mechanism which is used for outputting power and is arranged on the bracket, a transmission mechanism which is connected with the driving mechanism and is used for transmitting the power outputted by the driving mechanism, and a drop hammer assembly which comprises a hammer and is connected with the transmission mechanism, and receives the power outputted by the driving mechanism through the transmission mechanism so that the hammer can return to an original position after free fall; the impact model test groove includes a railway ballast groove located at the upper layer, force transfer iron blocks which are located just below the hammer of the hammer assembly and are used for accommodating railway ballasts and simulating rails, an inverted arch test piece which is located at the middle and is used for simulating an inverted arch structure, and a surrounding rock model box which is located at the lower part and is used for simulating rock and soil layers in a tunnel. The automatic tunnel inverted arch impact model system of the invention has the advantages of simple structure, simple operation, capability of quickly and accurately performing impact tests, and reliable test data.

Description

technical field [0001] The invention relates to the technical field of measuring solid deformation, in particular to an automatic tunnel inverted arch impact model system. Background technique [0002] The inverted arch is a reverse arched structure set at the bottom of the tunnel to improve the stress condition of the upper support structure, and it is one of the main components of the tunnel structure. Inverted arch is popularly interpreted as an upward-facing arch, generally of reinforced concrete structure. It forms an integral part of the tunnel with the secondary lining, which is used to increase structural stability and waterproof. On the one hand, the inverted arch can effectively transmit the ground pressure on the upper part of the tunnel through the tunnel side wall structure or the load on the road to the underground, and on the other hand, it can also effectively resist the reaction force from the lower part of the tunnel. [0003] For heavy-duty lines, the im...

AI Technical Summary

Problems solved by technology

[0005] 1. The initial position of the falling point of the steel impact hammer and the initial speed of the fall are not easy to accurately control, and the influence of human factors cannot be eliminated

[0006] 2. It is difficult to align the impact point. The impact hammer used in the United States is spherical, and the power transmission ball is also spherical. The impact of the two is point-to-point impact, which is more difficult to control.

[0007] 3. The impact hammer has no protection, and the power transmission ball is not positioned. After the impact hammer impacts the steel ball, it will fall to the bottom plate and produce a second irregular impact, which will also pose a threat to the safety of the test personnel.

[0008] 4. The base is not fixed, and the unfixed base will lose part of the energy during the impact process, which will affect the accuracy of the test

[0009] 5. Although some devices are very advanced, they are bulky and have high requirements for test sites and test costs, which is not conducive to popularization and use

[0010] 6. In the case of multiple repeated impacts, it is difficult to ensure that the impact hammer falls at the same point and the impact height is consistent with the simple device of manual operation.

When some devices are in use, the spherical surface of the impact hammer directly impacts the surface of the test piece, which is likely to cause stress concentration at the impact point and cannot ensure the accuracy of the test results.

When the impact hammer is manually released, its initial velocity and initial acceleration will be affected, and it is difficult to ensure the free fall movement of the impact hammer

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