Receding supporting structure suitable for large deformation of surrounding rock of soft rock tunnel

Abstract

The invention discloses an abdicating supporting structure suitable for large deformation of surrounding rock of a soft rock tunnel, the abdicating supporting structure is an arch frame structure formed by a plurality of sections of I-shaped steel, a lateral hydraulic cylinder, a vertical hydraulic cylinder and a hydraulic control box are mounted on the I-shaped steel of a vertical part, and an arch foot limiting device is arranged at the bottom of the abdicating supporting structure. The abdicating device has the advantages that the hydraulic control box is arranged, so that the pressure condition of liquid in each hydraulic cylinder can be accurately and visually known, then the pressure in each cylinder body is accurately released through the check valve in each cylinder body, and compared with a traditional abdicating device, the abdicating device has the advantages that observation is convenient, and the abdicating effect is controllable; compared with a traditional welding type or integrated structure, the whole receding supporting structure has the advantage of being more flexible, and pressure can be automatically adjusted to adapt to deformation.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel construction, and in particular to a yielding support structure suitable for large deformation of surrounding rock in soft rock tunnels. Background Art

[0002] With the booming development of China's transportation construction and water conservancy development, the number of tunnels passing through areas prone to large deformation such as high in-situ stress soft rock is gradually increasing. During the construction process, the large deformation of the surrounding rock of the tunnel section in areas prone to large deformation such as soft rock has the characteristic of cumulative increase in the time dimension. At the same time, the deformation amount is often relatively large, and the surrounding rock deformation shows the characteristics of dynamic continuity and gradual accumulation. In view of the above deformation characteristics of the surrounding rock, when using the traditional rigid arch structure for support, it often bears a large surrounding rock deformation pressure. If it exceeds the bearing limit of the steel arch, serious construction safety problems will be faced. Practice shows that simply increasing the support strength is still not enough to control the surrounding rock deformation. Therefore, it is necessary to release the surrounding rock deformation, and on the premise of not significantly affecting the strength of the steel arch structure, make it have a certain yielding function, so as to absorb the energy accumulated in the surrounding rock and release it to the outside, thereby reducing the pressure on the arch body of the steel arch and providing a constant resistance for the stable deformation of the surrounding rock mass. This is not only beneficial to extending the service life of the support structure, but also more beneficial to the long-term stability of the water conveyance tunnel.

[0003] In the past, the installation of the steel arch yielding device was relatively complex and not easy to operate, and it was difficult to adjust the yielding amount of the yielding device. At the same time, it was also difficult to observe the yielding effect. Summary of the Invention

[0004] The purpose of the present invention is to provide a yielding support structure suitable for large deformation of surrounding rock in soft rock tunnels in view of the deficiencies of the prior art. The yielding support structure controls the surrounding rock deformation and yielding through lateral hydraulic cylinders and vertical hydraulic cylinders, and the hydraulic control box located on the I-beam can accurately reflect the internal liquid pressure conditions of each hydraulic cylinder, and releases the internal liquid pressure through each check valve, which has the advantages of being easy to observe and controllable yielding effect compared with the prior art yielding devices.

[0005] To achieve the above technical solution, the present invention provides the following technical solution: A yielding support structure suitable for large deformation of surrounding rock in soft rock tunnels, the yielding support structure is composed of multiple sections of I-beams to form an arch structure, the lateral hydraulic cylinders, vertical hydraulic cylinders and hydraulic control boxes are installed on the vertical I-beams, and an arch foot limiting device is provided at the bottom of the yielding support structure.

[0006] As a preference of the above technical solution, the hydraulic control box is arranged on the side of one of the vertical hydraulic cylinders, and the circuits in the hydraulic control box are connected to the pressure sensors and lateral check valves in the lateral hydraulic cylinders, and the pressure sensors and vertical check valves in the vertical hydraulic cylinders.

[0007] As an optimization of the above technical solution, the lateral hydraulic cylinder includes a pressure equalizing steel plate, a hinge through-hole, a hinge connecting shaft, a sealing layer, a hinge base through-hole, a lateral hydraulic cylinder body, a lateral check valve, and internal pressure sensors and control equipment.

[0008] As an optimization of the above technical solution, the vertical hydraulic cylinder includes a pressure equalizing plate, a sealing ring, a vertical hydraulic cylinder body, a vertical check valve, and internal pressure sensors and control equipment.

[0009] As an optimization of the above technical solution, the area of the pressure equalizing plate is smaller than the area enclosed by the vertical hydraulic cylinder body.

[0010] As an optimization of the above technical solution, the springing limit device includes channel steel, steel vertical plates, a steel top plate, and a steel bottom plate; the steel vertical plates and the steel bottom plate are both fixed to the side surrounding rock and the tunnel floor with steel nails respectively.

[0011] The beneficial effects of the present invention are as follows: 1. Through the springing limit device, the I-beam can be restricted to be precisely perpendicular to the ground, ensuring that the entire structure is more stable.

[0012] 2. By setting up a hydraulic control box, the internal liquid pressure of each hydraulic cylinder can be accurately and intuitively understood, and then the pressure inside the cylinder can be precisely released through the check valve in each cylinder body. Compared with traditional yielding devices, it has the advantages of being convenient for observation and having a controllable yielding effect.

[0013] 3. The entire yielding support structure is more flexible compared with traditional welded or integral structures, and can automatically adjust the pressure to adapt to deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The following further describes the present invention with reference to the drawings: Figure 1 is a schematic structural view of the present invention; Figure 2 is a schematic top view of the lateral hydraulic cylinder of the present invention; Figure 3 is a schematic view of the top of the lateral hydraulic cylinder and the I-beam structure of the present invention; Figure 4 is a schematic structural view of the vertical hydraulic cylinder of the present invention; Figure 5 is a schematic view of the arrangement position of the check valve of the lateral hydraulic cylinder of the present invention; Figure 6 is a schematic structural view of the springing limit device of the present invention; Among them, 1. I-beam; 2. Lateral hydraulic cylinder; 3. Vertical hydraulic cylinder; 4. Hydraulic control box; 5. Arch-foot limiting device; 2-1. Pressure equalizing steel plate; 2-2. Hinge through-hole; 2-3. Hinge connecting shaft; 2-4. Sealing layer; 2-5. Hinge base through-hole; 2-6. Lateral hydraulic cylinder body; 2-7. Lateral check valve; 3-1. Pressure equalizing plate; 3-2. Sealing ring; 3-3. Vertical hydraulic cylinder body; 3-4. Vertical check valve; 5-1. Channel steel; 5-2. Steel vertical plate; 5-3. Steel top plate; 5-4. Steel bottom plate. Specific implementation mode

[0015] The following specific embodiments illustrate the implementation mode of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The "upper" and "lower" mentioned in this embodiment are consistent with the upper and lower directions of the attached drawings themselves. It is only for the convenience of description and is not used to limit the scope in which the present invention can be implemented. The change or adjustment of its relative relationship, without substantial change in technical content, should also be regarded as the scope in which the present invention can be implemented.

[0016] As shown from Figure 1 to Figure 6 As shown, a yielding support structure applicable to large deformation of surrounding rock in soft rock tunnels. The yielding support structure is composed of multiple sections of I-beams 1 to form an arch frame structure. The lateral hydraulic cylinders 2, vertical hydraulic cylinders 3 and hydraulic control box 4 are installed on the vertical I-beams 1. An arch-foot limiting device 5 is provided at the bottom of the yielding support structure. The arch-foot limiting device 5 includes channel steel 5-1, steel vertical plate 5-2, steel top plate 5-3 and steel bottom plate 5-4; the steel vertical plate 5-2 and the steel bottom plate 5-4 are both fixed to the side surrounding rock and the tunnel floor with steel nails respectively; the hydraulic control box 4 is arranged on the side of one of the vertical hydraulic cylinders 3, and the circuits in the hydraulic control box 4 are connected to the pressure sensors and lateral check valves 2-7 in the lateral hydraulic cylinders 2, and the pressure sensors and vertical check valves 3-4 in the vertical hydraulic cylinders 3; The lateral hydraulic cylinder 2 includes a pressure equalizing steel plate 2-1, a hinge through-hole 2-2, a hinge connecting shaft 2-3, a sealing layer 2-4, a hinge base through-hole 2-5, a lateral hydraulic cylinder body 2-6, a lateral check valve 2-7 and internal pressure sensors and control devices. The vertical hydraulic cylinder 3 includes a pressure equalizing plate 3-1, a sealing ring 3-2, a vertical hydraulic cylinder body 3-3, a vertical check valve 3-4 and internal pressure sensors and control devices. The area of the pressure equalizing plate 3-1 is smaller than the area enclosed by the vertical hydraulic cylinder body 3-3.

[0017] Working principle of the present invention: Install and fix the entire yielding support structure on the inner wall of the tunnel. During the construction process, large deformations are likely to occur in soft rocks and the like on the inner wall of the tunnel. The pressure of the deformation is transmitted to the pressure sensors in the lateral hydraulic cylinders 2 and the vertical hydraulic cylinders 3. Through the hydraulic control box, the internal liquid pressure conditions of each hydraulic cylinder can be accurately and intuitively understood, and then the pressure inside the cylinder body is precisely released through the check valves in each cylinder body.

Claims

1. A yielding support structure applicable to large deformation of surrounding rock in soft rock tunnels, characterized in that: The yielding support structure is composed of multiple sections of I-beams (1) to form an arch structure. The lateral hydraulic cylinders (2), vertical hydraulic cylinders (3), and hydraulic control box (4) are installed on the vertical I-beams (1). An arch-foot limiting device (5) is provided at the bottom of the yielding support structure.

2. The yielding support device according to claim 1, wherein: The hydraulic control box (4) is arranged on the side of one of the vertical hydraulic cylinders (3). The circuits in the hydraulic control box (4) are connected to the pressure sensors and lateral check valves (2-7) in the lateral hydraulic cylinders (2), and the pressure sensors and vertical check valves (3-4) in the vertical hydraulic cylinders (3).

3. The yielding support device according to claim 1, wherein: The lateral hydraulic cylinder (2) includes a pressure equalizing steel plate (2-1), hinge through-hole (2-2), hinge connecting shaft (2-3), sealing layer (2-4), hinge base through-hole (2-5), lateral hydraulic cylinder body (2-6), lateral check valve (2-7), and internal pressure sensors and control devices.

4. The yielding support device according to claim 1, wherein: The vertical hydraulic cylinder (3) includes a pressure equalizing plate (3-1), sealing ring (3-2), vertical hydraulic cylinder body (3-3), vertical check valve (3-4), and internal pressure sensors and control devices.

5. The yield support device according to claim 4 is characterized in that: The area of the pressure equalizing plate (3-1) is smaller than the enclosed area of the vertical hydraulic cylinder body (3-3).

6. The yielding support device according to claim 1, characterized in that: The arch-foot limiting device (5) includes a channel steel (5-1), steel vertical plate (5-2), steel top plate (5-3), and steel bottom plate (5-4); the steel vertical plate (5-2) and the steel bottom plate (5-4) are both fixed to the side surrounding rock and the tunnel floor respectively with steel nails.

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