Novel steel arch structure capable of being absorbed and deformed in a circumferential direction and construction method thereof

Abstract

This invention discloses a novel circumferentially deformable steel arch structure and its construction method. The novel circumferentially deformable steel arch structure includes a rubber ring, a steel arch, a water inlet pipe, a one-way valve, a water passage cavity, a water inlet pre-drilled hole, a water outlet pre-drilled hole, steel connectors, a constant pressure valve, a water inlet sealing gasket, a connecting pipe, and a water outlet sealing gasket. The rubber ring is a semi-hollow body made of elastic material, installed on the inner wall of the surrounding rock, and can expand when filled with water, generating a pre-pressure on the outer surrounding rock. The constant pressure valve is installed on the water inlet pipe, can be connected to external pressurization equipment, and can maintain the water pressure in the water passage cavity at a constant value. The construction method includes fabricating key components, installing the rubber ring, assembling the steel arch, and installing the water inlet pipe and one-way valve. This invention can achieve rapid support of the surrounding rock during tunnel construction, control the deformation of the surrounding rock, ensure the stability of the surrounding rock, and accelerate the construction speed of the tunnel.

Description

Technical Field

[0001] This invention relates to a novel circumferentially deformable steel arch frame structure and its construction method, specifically to a tunnel excavation surrounding rock support structure and construction method. Background Technology

[0002] With the development of tunnel support technology, steel arch frames have become a mature rock support technology applied to the excavation and construction of hydraulic tunnels. However, engineering practice has shown that this "rigid-against-rigid" support method has not achieved the expected support effect in soft rock tunnels, as rigid arch frames are difficult to suppress surrounding rock deformation. Therefore, a novel circumferential deformation-absorbing steel arch frame structure and its construction method are proposed. This optimizes the original "rigid-against-rigid" concept by introducing a "compromise" concept to adapt to the deformation of the surrounding rock in the tunnel. By fabricating a novel circumferential deformation-absorbing steel arch frame structure, a certain pre-pressure is applied to the surrounding rock using rubber rings. Through pressure maintenance by a constant pressure valve and water discharge by a one-way valve, this pre-pressure can be maintained even when the surrounding rock undergoes minor deformation, thereby absorbing some of the deformation and effectively enhancing the construction speed and safety of tunnel excavation and support. Summary of the Invention

[0003] The purpose of this invention is to provide a novel circumferentially deformable steel arch frame structure and its construction method, which can quickly support the surrounding rock during tunnel construction, control the deformation of the surrounding rock, ensure the stability of the surrounding rock, and accelerate the construction speed of the tunnel, thereby solving the problems mentioned in the background art.

[0004] To achieve the above objectives, the technical solution of the present invention is as follows:

[0005] A novel circumferentially deformable steel arch structure, characterized by comprising: a rubber ring, a steel arch, a water inlet pipe, a one-way valve, a water passage cavity, a water inlet pre-drilled hole, and a water outlet pre-drilled hole located on the rubber ring, steel connectors located on the steel arch, a constant pressure valve and a water inlet sealing gasket located on the water inlet pipe, and a connecting pipe and a water outlet sealing gasket located on the one-way valve; the rubber ring is disposed on the inner wall of the tunnel surrounding rock, and the rubber ring is provided with a water inlet pre-drilled hole and a water outlet pre-drilled hole for water inlet... The dimensions of the reserved holes and outlet holes meet the requirements for the inlet pipe and connecting pipe to enter. A water-passing cavity is provided inside the rubber ring, distributed along a 360° range in the inner circumferential direction of the rubber ring, and the water-passing cavity is connected to the inlet and outlet reserved holes. The steel arch frame is located inside the rubber ring, and adjacent steel arch frames are connected by steel connectors, which are evenly distributed at 90° intervals along the circumferential direction of the steel arch frame. The inlet pipe is located between the two rubber rings and the two steel arch frames. In the middle of the frame, the water inlet pipe and the water inlet pre-reserved hole on the rubber ring are connected. A constant pressure valve is installed on the water inlet pipe, and a water inlet sealing gasket is installed at the connection between the water inlet pipe and the water inlet pre-reserved hole. The size of the water inlet sealing gasket meets the requirements for the water inlet pipe to enter. The one-way valve is located in the middle of the two rubber rings and the two steel arch frames. The one-way valve is connected to the water outlet pre-reserved hole on the rubber ring through connecting pipes on both sides. A water outlet sealing gasket is installed at the connection between the connecting pipe and the water outlet pre-reserved hole. The size of the water outlet sealing gasket meets the requirements for the connecting pipe to enter. After the new steel arch frame structure is installed, water is filled into the water passage cavity through the water inlet pipe, and the water pressure is maintained at a constant value through the constant pressure valve. Under the action of water pressure, the water passage cavity can expand to a certain thickness and give the surrounding rock a pre-pressure. When the surrounding rock deforms and squeezes the water passage cavity, the water pressure in the water passage cavity will increase, and some water will flow out from the one-way valve until the water pressure drops to the constant value maintained by the constant pressure valve, thereby achieving the purpose of absorbing part of the deformation of the surrounding rock.

[0006] Furthermore, the thickness of the rubber ring and the size of the water-passing cavity can be determined according to the bearing conditions of the new steel arch frame structure that can absorb deformation in the circumferential direction, and rubber ring fixing accessories are prefabricated during the rubber ring manufacturing process.

[0007] Furthermore, the steel arch frame adopts the form of I-beams, and the steel connectors are integral with the steel arch frame, formed by welding, to enhance the integrity and stability of the steel arch frame structure. The dimensions of the steel arch frame can be determined according to the actual diameter of the tunnel surrounding rock.

[0008] Furthermore, the constant pressure valve on the water inlet pipe can be connected to an external pressurizing device, and the constant pressure valve can maintain the water pressure in the water passage cavity at a constant value.

[0009] Furthermore, the one-way valve only allows water to flow in one direction from the water passage cavity to the outside.

[0010] This invention also provides a construction method for a novel circumferentially deformable steel arch frame structure, comprising the following construction steps:

[0011] Step 1: Fabricate key components, including: rubber rings, steel arch frames, water inlet pipes, check valves, and corresponding rubber ring fixing accessories, steel connectors, constant pressure valves, and connecting pipes;

[0012] Step 2: Clean the inner surface of the tunnel surrounding rock to make it smooth and flat, and install the rubber ring in the corresponding position on the inner wall of the surrounding rock using the rubber ring fixing accessories;

[0013] Step 3: Install the steel arch frame inside the rubber ring and weld steel connectors between adjacent steel arch frames;

[0014] Step 4: Install the inlet pipe, check valve, constant pressure valve and connecting pipe between the two rubber rings and the two steel arches, and install the inlet sealing gasket and outlet sealing gasket at the corresponding positions. After installation, repeat this operation between the other two adjacent rubber rings and the two steel arches.

[0015] Step 5: Connect the water inlet pipe to the external pressurization device, add water to the water inlet pipe until the water passage cavity is full, and maintain the water pressure at a constant value through the constant pressure valve.

[0016] Compared with the prior art, the beneficial effects of the present invention are: the present invention has a simple structure, reasonable design, and efficient transportation and construction; the present invention can effectively control the deformation of the surrounding rock during the excavation of tunnel surrounding rock without affecting the progress of the project, and provide sufficient support for the deformed surrounding rock in the later stage; the structural dimensions of the present invention are relatively flexible, and different support force values ​​can be given by adjusting the thickness of the rubber ring, which can meet the needs of different types of projects. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the novel steel arch frame in this invention.

[0018] Figure 2 This is a schematic diagram showing the relative positions of the water inlet pipe and the one-way valve in this invention.

[0019] Figure 3 This is a partial schematic diagram of the water inlet pipe in this invention.

[0020] Figure 4 This is a schematic diagram of a partial cross-section of the water inlet pipe in this invention.

[0021] Figure 5 This is a partial schematic diagram of the one-way valve in this invention.

[0022] Figure 6 This is a partial cross-sectional schematic diagram of the one-way valve in this invention.

[0023] Among them, 1-rubber ring; 2-steel arch frame; 3-inlet pipe; 4-one-way valve; 101-water passage cavity; 102-inlet reserved hole; 103-outlet reserved hole; 201-steel connector; 301-constant pressure valve; 302-inlet sealing gasket; 401-connecting pipe; 402-outlet sealing gasket. Detailed Implementation

[0024] The technical solution of the present invention will now be clearly and completely described with reference to the embodiments and accompanying drawings. It should be understood that the embodiments described below are merely a part of the present invention, and not all of the embodiments. All other embodiments obtained based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0025] like Figure 1-6 As shown, a novel circumferentially deformable steel arch frame structure of the present invention includes a rubber ring 1, a steel arch frame 2, a water inlet pipe 3, a one-way valve 4, a water passage cavity 101, a water inlet reserved hole 102, a water outlet reserved hole 103, a steel connector 201, a constant pressure valve 301, a water inlet sealing gasket 302, a connecting pipe 401, and a water outlet sealing gasket 402.

[0026] like Figure 1-6 As shown, the rubber ring 1 is installed on the inner wall of the tunnel surrounding rock. The rubber ring 1 is provided with a water inlet reserved hole 102 and a water outlet reserved hole 103. The size of the water inlet reserved hole 102 and the water outlet reserved hole 103 meets the requirements for the water inlet pipe 3 and the connecting pipe 401 to enter. The rubber ring 1 is provided with a water passage cavity 101. The water passage cavity 101 is distributed in a 360° range along the inner ring of the rubber ring 1, and the water passage cavity 101 is connected to the water inlet reserved hole 102 and the water outlet reserved hole 103. The thickness of the rubber ring 1 and the size of the water passage cavity 101 can be determined according to the bearing conditions of the new type of steel arch frame structure that can absorb deformation in the circumferential direction. In addition, rubber ring fixing accessories are prefabricated during the manufacturing process of the rubber ring 1.

[0027] like Figure 1 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, the steel arch frame 2 is located inside the rubber ring 1. Adjacent steel arch frames 2 are connected by steel connectors 201. The steel connectors 201 are evenly distributed at 90° intervals along the circumferential direction of the steel arch frame 2. The steel arch frame 2 adopts the form of an I-beam. The steel connectors 201 and the steel arch frame 2 are integral structures formed by welding to enhance the integrity and stability of the steel arch frame structure. The size of the steel arch frame 2 can be determined according to the actual diameter of the surrounding rock of the tunnel.

[0028] like Figure 2 , Figure 3 and Figure 4As shown, the water inlet pipe 3 is located in the middle of the two rubber rings 1 and the two steel arch frames 2. The water inlet pipe 3 and the water inlet reserved hole 102 on the rubber ring 1 are connected. The water inlet pipe 3 is equipped with a constant pressure valve 301. The connection between the water inlet pipe 3 and the water inlet reserved hole 102 is equipped with a water inlet sealing gasket 302. The size of the water inlet sealing gasket 302 meets the requirements for the water inlet pipe 3 to enter. The constant pressure valve 301 on the water inlet pipe 3 can be connected to an external pressurizing device. The constant pressure valve 301 can maintain the water pressure in the water passage cavity 101 at a constant value.

[0029] like Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, the one-way valve 4 is located in the middle of the two rubber rings 1 and the two steel arch frames 2. The one-way valve 4 is connected to the water outlet reserved hole 103 on the rubber ring 1 through the connecting pipes 401 on both sides. A water outlet sealing gasket 402 is provided at the connection between the connecting pipe 401 and the water outlet reserved hole 103. The size of the water outlet sealing gasket 402 meets the requirements for the connecting pipe 401 to enter. The one-way valve 4 only allows water to flow unidirectionally from the water passage cavity to the outside.

[0030] like Figure 1-6 As shown, after the new steel arch frame structure is installed, water is filled into the water passage cavity 101 through the water inlet pipe 3, and the water pressure is maintained at a constant value through the constant pressure valve 301. Under the action of water pressure, the water passage cavity 101 can expand to a certain thickness and give the surrounding rock a pre-pressure. When the surrounding rock deforms and squeezes the water passage cavity 101, the water pressure in the water passage cavity 101 will increase, and some water will flow out from the one-way valve 4 until the water pressure drops to the constant value maintained by the constant pressure valve 301, thereby achieving the purpose of absorbing part of the deformation of the surrounding rock.

[0031] The present invention discloses a construction method for a novel circumferentially deformable steel arch frame structure, comprising the following construction steps:

[0032] Step 1: Fabricate key components, including: rubber ring 1, steel arch frame 2, water inlet pipe 3, one-way valve 4, and corresponding rubber ring fixing accessories, steel connectors 201, constant pressure valve 301 and connecting pipe 401;

[0033] Step 2: Clean the inner surface of the tunnel surrounding rock to make it smooth and flat, and install the rubber ring 1 in the corresponding position on the inner wall of the surrounding rock using the rubber ring fixing accessories;

[0034] Step 3: Install the steel arch frame 2 inside the rubber ring 1, and weld the steel connector 201 between two adjacent steel arch frames 2;

[0035] Step 4: Install the inlet pipe 3, check valve 4, constant pressure valve 301 and connecting pipe 401 between the two rubber rings (1) and the two steel arch frames 2, and install the inlet sealing gasket 302 and outlet sealing gasket 402 at the corresponding positions. After installation, repeat this operation between the other two adjacent rubber rings 1 and the two steel arch frames 2.

[0036] Step 5: Connect the water inlet pipe 3 to the external pressurization device, add water to the water inlet pipe 3 until the water passage cavity 101 is full of water, and maintain the water pressure at a constant value through the constant pressure valve 301.

[0037] Furthermore, this specification should be considered as a whole, and the above-described embodiments are not the only independent technical solutions of this invention. The technical solutions in the embodiments can be appropriately combined and adjusted to form other embodiments that can be understood by those skilled in the art.

Claims

1. A novel circumferentially deformable steel arch frame structure, characterized in that: Includes a rubber ring (1), a steel arch frame (2), a water inlet pipe (3), a one-way valve (4), a water passage cavity (101), a water inlet reserved hole (102), and a water outlet reserved hole (103) located on the rubber ring (1), a steel connector (201) located on the steel arch frame (2), a constant pressure valve (301) and a water inlet sealing gasket (302) located on the water inlet pipe (3), and a connecting pipe (401) and a water outlet sealing gasket (402) located on the one-way valve (4). The rubber ring (1) is set on the inner wall of the surrounding rock of the tunnel. The rubber ring (1) is provided with a water inlet reserved hole (102) and a water outlet reserved hole (103). The size of the water inlet reserved hole (102) and the water outlet reserved hole (103) meets the requirements for the water inlet pipe (3) and the connecting pipe (401) to enter. The rubber ring (1) is provided with a water passage cavity (101). The water passage cavity (101) is distributed in a 360° range along the inner ring (1) and the water passage cavity (101) is connected to the water inlet reserved hole (102) and the water outlet reserved hole (103). The steel arch frame (2) is located inside the rubber ring (1), and adjacent steel arch frames (2) are connected by steel connectors (201). The steel connectors (201) are distributed at equal intervals along the circumferential direction of the steel arch frame (2). The water inlet pipe (3) is located in the middle of the rubber ring (1) and the steel arch frame (2). The water inlet pipe (3) is connected to the water inlet reserved hole (102) on the rubber ring (1). The water inlet pipe (3) is equipped with a constant pressure valve (301). The water inlet pipe (3) and the water inlet reserved hole (102) are equipped with a water inlet sealing gasket (302). The size of the water inlet sealing gasket (302) meets the requirements for the water inlet pipe (3) to enter. The one-way valve (4) is located in the middle of the two rubber rings (1) and the two steel arch frames (2), and the one-way valve (4) is connected to the water outlet reserved hole (103) on the rubber ring (1) through the connecting pipes (401) on both sides. The connection between the connecting pipe (401) and the water outlet reserved hole (103) is provided with a water outlet sealing gasket (402). The size of the water outlet sealing gasket (402) meets the requirements for the connecting pipe (401) to enter. The one-way valve (4) only allows water to flow in one direction from the water passage cavity (101) to the outside. The constant pressure valve (301) is used to maintain the water pressure in the water passage cavity (101) at a constant value; The opening pressure of the one-way valve (4) is higher than the set pressure of the constant pressure valve (301), and there is a pressure difference of 0.05-0.15MPa between the two. When the surrounding rock deforms and squeezes the rubber ring (1), the water pressure in the water passage cavity (101) increases and overcomes the opening pressure of the one-way valve (4), causing some water to flow out from the one-way valve (4) to the outside, thereby absorbing the deformation of the surrounding rock; after the deformation stops, the constant pressure valve (301) automatically replenishes water to restore the constant water pressure in the water passage cavity (101).

2. The novel circumferentially deformable steel arch frame structure according to claim 1, characterized in that: The thickness of the rubber ring (1) and the size of the water passage cavity (101) can be determined according to the bearing conditions of the new type of steel arch frame structure that can absorb deformation in the circumferential direction. In the process of making the rubber ring (1), rubber ring fixing accessories are prefabricated. The rubber ring fixing accessories include a combination of pre-embedded bolts and anchor plates, which are used to anchor the rubber ring (1) to the inner wall of the surrounding rock.

3. The novel circumferentially deformable steel arch frame structure according to claim 1, characterized in that: The steel arch frame (2) is in the form of an I-beam. The steel connector (201) and the steel arch frame (2) are an integral structure formed by welding. The size of the steel arch frame (2) can be determined according to the diameter of the actual tunnel surrounding rock.

4. A novel circumferentially deformable steel arch frame structure according to claim 1, characterized in that: The constant pressure valve (301) on the water inlet pipe (3) can be connected to an external pressurization device. The set pressure value of the constant pressure valve (301) can be adjusted according to the geological conditions of the surrounding rock and the support requirements.

5. A novel circumferentially deformable steel arch frame structure according to claim 1, characterized in that: The one-way valve (4) is a spring-loaded one-way valve. Its opening pressure can be adjusted according to the deformation rate of the surrounding rock and the support requirements. The one-way valve (4) is located in the middle space enclosed by two adjacent rubber rings (1) and two adjacent steel arch frames (2).

6. A construction method for a novel circumferentially deformable steel arch frame structure as described in any one of claims 1-5, characterized in that, The construction steps include the following: Step 1: Fabricate key components, including: rubber ring (1), steel arch frame (2), water inlet pipe (3), one-way valve (4), and corresponding rubber ring fixing accessories, steel connectors (201), constant pressure valve (301) and connecting pipe (401). Step 2: Clean the inner surface of the surrounding rock of the tunnel to make it smooth and flat, and install the rubber ring (1) in the corresponding position on the inner wall of the surrounding rock through the rubber ring fixing accessories; Step 3: Install the steel arch frame (2) inside the rubber ring (1) and weld the steel connector (201) between adjacent steel arch frames (2). Step 4: Install the inlet pipe (3), check valve (4), constant pressure valve (301) and connecting pipe (401) between the two rubber rings (1) and the two steel arch frames (2), and install the inlet sealing gasket (302) and outlet sealing gasket (402) at the corresponding positions. Step 5: Connect the inlet pipe (3) to the external pressurization device, add water to the inlet pipe (3) until the water passage cavity (101) is full of water, maintain the water pressure at a constant value through the constant pressure valve (301), and adjust the opening pressure of the check valve (4) to make it higher than the set pressure value of the constant pressure valve (301) by 0.05-0.15MPa.

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