Soil sealing and guiding thrust plate for horizontal tunnel lining model testbed board

Abstract

The invention provides a soil sealing and guiding thrust plate for a horizontal tunnel lining model testbed board, which belongs to the technical field of civil engineering, wherein the trust plate is simply put on the testbed board, the bottom of the trust plate is stressed by larger friction force which is not uniform at the end and the right end, so the trust plate is caused to be stressed unevenly at the end and the right end, four trust plates are easily form a rhombus structure, so the surrounding rock and the lining model are unevenly stressed, and the measuring result is influenced. In the invention, a concave groove is arranged below the two vertical crossed ribs of the trust plate and is welded on the testbed board, a roller is arranged at the bottom of the concave groove, and the vertical lower end surfaces of the cross ribs are tangential to the roller; and a sliding plate is in an I-shaped beam structure, one end of the sliding plate is arranged in the sliding plate groove of the trust plate and is tangential to the roller in the sliding plate groove. The thrust plate is mainly used for the soil sealing, guiding and trusting tests of the horizontal tunnel lining model testbed board.

Description

technical field [0001] The invention belongs to the technical field of civil engineering, in particular to a thrust plate used for tunnel lining model test research. Background technique [0002] The sealable soil-guiding thrust plate is a key structure in the tunnel lining model test research, which involves whether the horizontal thrust can be applied accurately and parallelly, whether the force inside the surrounding rock is uniform, and whether the force on the lining model is consistent. [0003] The thrust plate is used to realize the horizontal four-sided loading of the square surrounding rock, and it is necessary to prevent a large amount of spillage of the surrounding rock. Therefore, guiding and sealing soil are the key designs of the thrust plate. There are mainly two types of existing devices, both of which adopt four I-shaped push plates placed on the test bench to form a mouth-shaped structure, and each push plate is horizontally driven by two hydraulic cylinde...

AI Technical Summary

Problems solved by technology

[0004] The problem with the first structure is that the push plate is simply placed on the test table, and the bottom will be subjected to a large frictional force that is uneven from left to right, resulting in uneven force on the left and right of the push plate, and the four push plates are easy to form a rhombus structure, making The uneven force on the surrounding rock and lining model will affect the test results; the large friction force will also make the push plate lean forward, resulting in uneven force on the surrounding rock and affect the test results

The problem with adopting the second structure is: because each push plate is driven by two hydraulic cylinders, the push plate is simply placed on the test table, and the bottom will be subjected to a large frictional force that is uneven from left to right, resulting in uneven force on the left and right of the push plate. Both have high requirements for L-shaped angle steel and corresponding sliding rollers; L-shaped angle steel and sliding rollers are placed inside the push plate in contact with the surrounding rock, occupying the internal space of the surrounding rock, making the force of the surrounding rock become two layers, That is to say, both the plane of the push plate and the plane outside the chute participate in the force transmission, which makes the force on the surrounding rock uneven

Because the mass of the thrust plate is nearly 600kg, when the thrust plate of the two schemes moves to the shrinking direction of the hydraulic cylinder, it needs to use a large external force, such as hydraulic pressure or lifting device, and the cost is relatively high

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