Self-adaptive lining pressure regulating cavity and fitting durability test device thereof

Abstract

The invention provides a durability test device for a self-adaptive lining pressure regulating cavity and accessories thereof. The durability test device comprises a pressure tank and a pressure regulating cavity arranged in the pressure tank. The pressure tank is a sealed high-pressure tank used for simulating a high-pressure water tunnel, the top of the pressure tank is provided with an overflow port and an overflow valve, the bottom of the pressure tank is provided with a water inlet / outlet hole, a water inlet / outlet valve, a pressure relief hole, a pressure relief one-way valve and a pressure relief valve, the pressure relief one-way valve and the pressure relief valve can adjust the set pressure value, and a pressure tank pressure gauge is installed outside the pressure tank. The pressure regulating cavity is hung on the axis in the pressure tank through a connecting pipe fitting, and the pressure regulating cavity is provided with a water inlet and a water inlet one-way valve capable of regulating a set pressure value; and a pressure regulating cavity pressure gauge is arranged outside the pressure tank. According to the invention, different internal and external water pressure changes and surrounding rock deformation of the water delivery tunnel lining can be simulated, the stress condition of the self-adaptive lining structure pressure regulating cavity is monitored, the test of the durability of the self-adaptive lining pressure regulating cavity and accessories thereof is realized, and reliable information with reference value is provided for long-term safe and stable operation research of the self-adaptive lining structure.

Description

Technical Field

[0001] The invention relates to a durability test device, in particular to a test device for testing the durability of an adaptive lining pressure regulating chamber and its accessories. The invention belongs to the technical field of geotechnical engineering tunnel lining. Background Art

[0002] High-pressure hydraulic tunnels are an important part of the water delivery system of pumped-storage power stations. The selection and design of their lining structures are directly related to the safety level and investment benefits of the power station, and are a key link in the construction of pumped-storage power stations. At present, the commonly used lining structure types for the design of high-pressure hydraulic tunnels in pumped-storage power stations in my country are reinforced concrete lining, steel plate lining and adaptive lining. The steel plate lining is difficult to construct in the tunnel, has high welding technology requirements, slow progress, and is expensive. In addition, it is prone to buckling problems under the action of high external water during the emptying period, and there are cases both at home and abroad. Reinforced concrete lining is currently a recognized preferred lining structure that combines both technical and economic advantages. However, reinforced concrete linings generally crack and permeate under the action of high internal water during operation, and external surrounding rock anti-seepage treatment is required, which requires high surrounding rock quality. Improper or untimely treatment can easily cause larger-scale leakage and even hydraulic fracturing, which not only seriously affects the operating efficiency of the pumped-storage power station, but also poses a great threat to the overall safety of the power station. Adaptive lining is a newly developed lining structure in recent years. It is a new lining technology developed on the basis of reinforced concrete lining and steel plate lining technology. It mainly consists of four parts: pressure regulating chamber, flow control unit, pressure regulating chamber accessories and concrete lining. During operation, the unbalanced water pressure inside and outside the concrete lining is automatically balanced through the internal and external water connection function of the flow control unit, the pressure regulating chamber and its accessories, and the excessive tension or pressure that the concrete lining may bear is strictly controlled within the allowable range, effectively solving the problem of concrete lining cracking and water permeability caused by high internal water pressure during operation, and at the same time eliminating the problem of concrete lining instability caused by high external water pressure during the emptying period. Therefore, in this sense, adaptive lining inherits the advantages of fast construction and low cost of concrete lining, and at the same time has the advantages of good anti-seepage of steel plate lining, which is an innovation of the current high-pressure hydraulic tunnel lining technology.

[0003] Therefore, conducting durability tests on the adaptive lining pressure regulating chamber and its accessories is of great significance for promoting the development, scientific research and technological innovation of the emerging adaptive lining technology. It also has important engineering value for promoting the popularization and application of adaptive lining technology in pumped storage projects. Summary of the invention

[0004] In view of the above reasons, the purpose of the present invention is to provide a test device for testing the durability of the adaptive lining pressure regulating chamber and its accessories. The durability test device can simulate the different internal and external water pressure changes and surrounding rock deformation of the water conveyance tunnel lining, monitor the stress conditions of the adaptive lining pressure regulating chamber, and realize the test of the durability performance of the adaptive lining pressure regulating chamber and its accessories, providing reliable data with reference value for the long-term safe and stable operation research of the adaptive lining structure.

[0005] To achieve the above-mentioned object, the present invention adopts the following technical scheme: an adaptive lining pressure regulating chamber and its accessories durability test device, which comprises a pressure tank and a pressure regulating chamber arranged in the pressure tank;

[0006] The pressure tank is a sealed tank body used to simulate a water tunnel; the pressure tank is horizontally arranged, and an overflow port is provided on the top of the pressure tank, and an overflow valve is installed at the overflow port through a connecting pipe; an inlet / drainage hole is provided at the bottom of the pressure tank, and an inlet / drainage valve is installed at the inlet / drainage hole through a connecting pipe;

[0007] The bottom of the pressure tank is also provided with a pressure relief hole, a connecting pipe is installed at the pressure relief hole, a pressure relief one-way valve with an adjustable set pressure value is installed on the connecting pipe located inside the pressure tank, and a pressure relief valve is installed on the connecting pipe located outside the pressure tank;

[0008] A pressure tank pressure gauge for measuring the water pressure inside the pressure tank is also installed outside the pressure tank through a connecting pipe fitting;

[0009] The pressure regulating chamber is suspended on the axis of the pressure tank through a connecting pipe; the pressure regulating chamber is provided with a pressure regulating chamber water inlet, a connecting pipe is installed at the pressure regulating chamber water inlet, a water inlet check valve with adjustable set pressure value is installed on the connecting pipe, and the connecting pipe passes through the top of the pressure tank;

[0010] A pressure regulating chamber pressure gauge for measuring the internal pressure of the pressure regulating chamber is also provided outside the pressure tank, and the pressure regulating chamber pressure gauge is connected to the water inlet of the pressure regulating chamber through a connecting pipe.

[0011] Preferably, the water flow direction of the pressure regulating chamber water inlet check valve is to flow into the interior of the pressure regulating chamber; when the difference between the external water pressure and the internal water pressure of the pressure regulating chamber is greater than the set pressure value of the pressure regulating chamber water inlet check valve, the water inlet check valve opens, and external water flows into the pressure regulating chamber; as the water pressure in the pressure regulating chamber increases, when the water pressure difference between the internal and external water of the pressure regulating chamber is less than the set pressure value of the pressure regulating chamber water inlet check valve, the pressure regulating chamber water inlet check valve automatically closes, and water injection into the pressure regulating chamber stops.

[0012] Preferably, the pressure relief one-way valve is connected to the water in the pressure tank, and the water flow direction is to flow to the outside of the pressure tank; when the water pressure difference between the inside and outside of the pressure tank is greater than the set pressure value of the pressure relief one-way valve, the pressure relief one-way valve and the pressure relief valve are opened to relieve pressure until the water pressure difference between the inside and outside of the pressure tank is reduced to the set pressure value of the pressure relief one-way valve, at which time the pressure relief one-way valve and the pressure relief valve are closed to stop pressure relief.

[0013] Preferably, the pressure tank is a cylindrical high-pressure steel pipe, with sealing plates at both ends thereof, a rubber sealing gasket is provided between the sealing plate and the tank body, and the sealing plate is detachably sealed and connected to the end of the pressure tank by bolts;

[0014] The pressure regulating chamber is a rectangular box made of flexible water-impermeable material with a wall thickness of 1.0 cm. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the durability test device of the present invention;

[0016] Figure 2 It is a schematic diagram of the internal structure of the durability test device of the present invention;

[0017] Figure 3 It is a schematic diagram of the structure of the pressure regulating chamber and its accessories of the durability test device of the present invention;

[0018] Figure 4 It is a schematic diagram of the structure of the pressure inlet / drainage pressure relief part of the durability test device of the present invention;

[0019] Among them, 1-pressure tank, 11-sealing plate, 12-rubber sealing gasket, 13-bolt, 14-overflow port, 15-overflow valve, 16-inlet / drainage hole, 17-inlet / drainage valve, 18-pressure relief hole, 19-pressure relief check valve, 110-pressure relief valve, 111-pressure tank pressure gauge connector, 112-pressure tank pressure gauge; 2-pressure regulating chamber, 21-pressure regulating chamber water inlet, 22-pressure regulating chamber connecting pipe fittings, 23-pressure regulating chamber water inlet check valve, 24-pressure regulating chamber pressure gauge. DETAILED DESCRIPTION

[0020] The structure and features of the present invention are described in detail below in conjunction with the accompanying drawings and embodiments. It should be noted that various modifications can be made to the embodiments disclosed herein, and therefore, the embodiments disclosed in the specification should not be regarded as limiting the present invention, but are merely examples of embodiments, the purpose of which is to make the features of the present invention obvious.

[0021] like Figure 1-Figure 4 As shown, the durability test device of the adaptive lining pressure regulating chamber and its accessories of the present invention comprises a pressure tank 1 and a pressure regulating chamber 2 arranged in the pressure tank.

[0022] The pressure tank 1 is a cylindrical sealed high-pressure tank used to simulate a high-pressure water tunnel. The pressure tank is horizontally arranged, with sealing plates 11 at both ends, a rubber sealing gasket 12 between the sealing plate and the tank body, and the sealing plate 11 is detachably sealed and connected to the tank body by bolts 13.

[0023] An overflow port 14 is provided at the top of the horizontally arranged pressure tank 1, and a connecting pipe is installed at the overflow port, and an overflow valve 15 is installed on the connecting pipe. When water is poured into the pressure tank, the overflow valve 15 is opened to exhaust air to ensure that the pressure tank is filled with water.

[0024] An inlet / drainage hole 16 is provided at the bottom of the pressure tank 1, and a connecting pipe is installed at the inlet / drainage hole. An inlet / drainage valve 17 is installed on the connecting pipe. When the inlet / drainage valve 17 is opened, the water in the pressure tank can be pressurized or different amounts of water can be injected or discharged from the inlet / drainage hole 16 to simulate different external water pressure conditions of high-pressure hydraulic tunnels and the deformation conditions of the tunnel surrounding rocks.

[0025] A pressure relief hole 18 is also provided at the bottom of the pressure tank, and a connecting pipe is installed at the pressure relief hole. A pressure relief check valve 19 with an adjustable set pressure value is installed on the connecting pipe located inside the pressure tank, and a pressure relief valve 110 is installed on the connecting pipe located outside the pressure tank. The pressure relief check valve 19 is connected to the water in the pressure tank, and the water in the pressure tank flows to the outside of the pressure tank through the pressure relief check valve; the pressure relief check valve 19 of the pressure tank can be set to a certain pressure value. When the pressure difference between the inside and outside of the pressure tank is greater than the set value, the pressure relief check valve 19 of the pressure tank is opened, and the pressure relief valve 110 is also opened to release the pressure until the pressure difference between the inside and outside of the pressure tank is reduced to the pressure setting value of the pressure relief check valve 19, and the pressure relief stops.

[0026] The pressure tank 1 is also provided with a pressure tank pressure gauge 112 for measuring the water pressure inside the pressure tank via a connecting pipe 111 .

[0027] The pressure regulating chamber 2 is a rectangular box, located on the axis of the pressure tank. The pressure regulating chamber 2 is provided with a pressure regulating chamber water inlet 21, and a pressure regulating chamber connecting pipe 22 is installed at the water inlet. A pressure regulating chamber water inlet check valve 23 with adjustable set pressure value is installed on the connecting pipe 22. The connecting pipe 22 passes through the top of the pressure tank 1; at the same time, the pressure regulating chamber 2 is suspended in the pressure tank 1 through the connecting pipe 22. A pressure regulating chamber pressure gauge 24 for measuring the water pressure inside the pressure regulating chamber is also provided on the top of the pressure tank 1. The pressure regulating chamber pressure gauge 24 is connected to the pressure regulating chamber water inlet 21 through the connecting pipe.

[0028] The water flow direction of the pressure regulating chamber water inlet check valve 23 is to flow into the inside of the pressure regulating chamber. When the difference between the external water pressure and the internal water pressure of the pressure regulating chamber is greater than the pressure value set by the water inlet check valve, the water inlet check valve 23 opens, and the external water flows into the pressure regulating chamber 2 through the pressure regulating chamber water inlet check valve 23 and the pressure regulating chamber water inlet 21, that is, water is injected into the pressure regulating chamber 2; as the water pressure in the pressure regulating chamber increases, when the water pressure difference between the inside and outside of the pressure regulating chamber is less than the set pressure value of the water inlet check valve, the pressure regulating chamber water inlet check valve 23 automatically closes, and water injection into the pressure regulating chamber stops.

[0029] In a preferred embodiment of the present invention, the pressure tank 1 is a high-pressure steel pipe with a height of 1.2m and an inner diameter of 1.2m. The pressure regulating chamber 2 is a rectangular box made of a flexible impermeable material (such as rubber) with a wall thickness of 1cm and a length of 1.0m x width of 1.0m x height of 0.05m.

[0030] During the test, by injecting different amounts of water into pressure tank 1 or pressurizing the water in the pressure tank, the external water pressure and surrounding rock changes of the adaptive lining pressure regulating cavity are simulated; by injecting different amounts of water into pressure regulating cavity 2, the internal water pressure of the adaptive lining pressure regulating cavity is simulated.

[0031] Embodiment 1:

[0032] Set the pressure value of the pressure regulating chamber water inlet check valve 23 according to the test purpose; inject water into the pressure tank 1 through the pressure tank inlet / drain valve 17 until the pressure tank overflow valve 15 discharges water, and close the pressure tank inlet / drain valve 17 and the pressure tank overflow valve 15; close the pressure tank pressure relief valve 110; inject water into the pressure regulating chamber through the connecting pipe and the pressure regulating chamber water inlet 21 and pressurize it to the target value; observe the water pressure changes in the pressure tank 1 and the pressure regulating chamber 2 through the pressure tank pressure gauge 112 and the pressure regulating chamber pressure gauge 24; judge the pressure condition of the pressure regulating chamber 2 through the pressure regulating chamber pressure gauge 24.

[0033] This embodiment can test the functions of the pressure regulating chamber 2 and its accessory, the pressure regulating chamber water inlet check valve 23, as well as the working performance of the pressure regulating chamber under the condition of limited deformation (i.e., when the surrounding rock does not deform and the pressure regulating chamber cannot deform either), and its force on the surroundings.

[0034] Embodiment 2:

[0035] According to the test purpose, the pressure value of the pressure regulating chamber water inlet check valve 23 is set, and water is injected into the pressure tank 1 through the pressure tank inlet / drain valve 17 until water is discharged from the pressure tank overflow valve 15; the pressure tank pressure relief valve 110 is closed, the pressure tank overflow valve 15 is closed, and the pressure tank is continuously pressurized to the target value through the pressure tank inlet / drain valve 17; water is injected into the pressure regulating chamber through the connecting pipe fittings and the pressure regulating chamber water inlet 21 and pressurized to the target value; the water pressure changes in the pressure tank 1 and the pressure regulating chamber 2 are observed through the pressure tank pressure gauge 112 and the pressure regulating chamber pressure gauge 24; the pressure condition of the pressure regulating chamber 2 can be judged through the pressure regulating chamber pressure gauge 24.

[0036] This embodiment can test the functions of the pressure regulating chamber 2 and its accessory, the pressure regulating chamber water inlet check valve 23, as well as the working performance of the pressure regulating chamber under high external water pressure conditions and the force exerted on the surroundings.

[0037] Embodiment 3:

[0038] Set the pressure value of the pressure regulating chamber water inlet check valve 23 according to the test purpose; inject water into the pressure tank through the pressure tank inlet / drain valve 17 until the pressure tank overflow valve 15 discharges water; close the pressure tank pressure relief valve 110; open the pressure tank inlet / drain valve 17 to discharge the water in the pressure tank to the set water volume; close the pressure tank overflow valve 15 and the pressure tank inlet / drain valve 17; inject water into the pressure regulating chamber through the connecting pipe fittings and the pressure regulating chamber water inlet 21 and pressurize it to the target value; observe the water pressure changes in the pressure tank 1 and the pressure regulating chamber 2 through the pressure tank pressure gauge 112 and the pressure regulating chamber pressure gauge 24; the pressure condition of the pressure regulating chamber can be judged through the pressure regulating chamber pressure gauge 24.

[0039] This embodiment can test the functions of the pressure regulating chamber 2 and its accessory, the pressure regulating chamber water inlet check valve 23, as well as the working performance of the pressure regulating chamber under the condition of a certain deformation space on the outside and the force exerted on the surroundings.

[0040] By changing the water inlet of the pressure tank, the pressure of the water in the tank, the water inlet of the pressure regulating chamber and the water pressure, it is possible to carry out performance tests on the adaptive lining pressure regulating chamber and its accessories under complex conditions; by cyclically loading the pressure tank and the pressure regulating chamber, long-term durability tests can be achieved.

[0041] The present invention simulates the durability test of the adaptive lining pressure regulating chamber and its accessories under different combination conditions such as internal water, external water, and surrounding rock deformation of the deep buried tunnel lining by opening and closing different one-way valves, the internal water filling degree, and the pressure size, so as to provide reliable information with reference value for the long-term safe and stable operation research of the adaptive lining structure.

[0042] Finally, it should be noted that the above-described embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some or all of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An adaptive lining pressure regulating chamber and its accessories durability test device, characterized by: It includes a pressure tank and a pressure regulating chamber arranged in the pressure tank; The pressure tank is a sealed tank body used to simulate a water tunnel; the pressure tank is horizontally arranged, and an overflow port is provided on the top of the pressure tank, and an overflow valve is installed at the overflow port through a connecting pipe; an inlet / drainage hole is provided at the bottom of the pressure tank, and an inlet / drainage valve is installed at the inlet / drainage hole through a connecting pipe; The bottom of the pressure tank is also provided with a pressure relief hole, a connecting pipe is installed at the pressure relief hole, a pressure relief one-way valve with an adjustable set pressure value is installed on the connecting pipe located inside the pressure tank, and a pressure relief valve is installed on the connecting pipe located outside the pressure tank; A pressure tank pressure gauge for measuring the water pressure inside the pressure tank is also installed outside the pressure tank through a connecting pipe fitting; The pressure regulating chamber is suspended on the axis of the pressure tank through a connecting pipe; the pressure regulating chamber is provided with a pressure regulating chamber water inlet, a connecting pipe is installed at the pressure regulating chamber water inlet, a water inlet check valve with adjustable set pressure value is installed on the connecting pipe, and the connecting pipe passes through the top of the pressure tank; A pressure regulating chamber pressure gauge for measuring the internal pressure of the pressure regulating chamber is also provided outside the pressure tank, and the pressure regulating chamber pressure gauge is connected to the water inlet of the pressure regulating chamber through a connecting pipe.

2. The durability test device for the adaptive lining pressure regulating chamber and its accessories according to claim 1 is characterized in that: The water flow direction of the pressure regulating chamber water inlet check valve is to flow into the interior of the pressure regulating chamber; when the difference between the external water pressure and the internal water pressure of the pressure regulating chamber is greater than the set pressure value of the pressure regulating chamber water inlet check valve, the water inlet check valve opens, and external water flows into the pressure regulating chamber; as the water pressure in the pressure regulating chamber increases, when the water pressure difference between the internal and external water of the pressure regulating chamber is less than the set pressure value of the pressure regulating chamber water inlet check valve, the pressure regulating chamber water inlet check valve automatically closes, and water injection into the pressure regulating chamber stops.

3. The durability test device for the adaptive lining pressure regulating chamber and its accessories according to claim 1 is characterized in that: The pressure relief one-way valve is connected to the water in the pressure tank, and the water flows toward the outside of the pressure tank; when the water pressure difference between the inside and outside of the pressure tank is greater than the set pressure value of the pressure relief one-way valve, the pressure relief one-way valve and the pressure relief valve are opened to relieve pressure until the water pressure difference between the inside and outside of the pressure tank is reduced to the set pressure value of the pressure relief one-way valve, at which time the pressure relief one-way valve and the pressure relief valve are closed to stop pressure relief.

4. The durability test device for the adaptive lining pressure regulating chamber and its accessories according to claim 1 is characterized in that: The pressure tank is a cylindrical high-pressure steel pipe, with sealing plates at both ends, a rubber sealing gasket is provided between the sealing plate and the tank body, and the sealing plate is detachably sealed and connected to the end of the pressure tank by bolts; The pressure regulating chamber is a rectangular box made of flexible water-impermeable material with a wall thickness of 1.0 cm.

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