Concrete lining internal and external water pressure difference adjusting device

Abstract

The invention discloses a concrete lining internal and external water pressure difference adjusting device, and belongs to the technical field of engineering. The pressure difference adjusting device comprises a valve body cylinder, a piston, a rubber water stop strip and a spring; the valve body cylinder is embedded in a reinforced concrete lining, the piston is installed in the valve body cylinder, a rubber water stop strip is arranged between a valve body cylinder top plate and a piston top plate, the two ends of the spring are connected between a piston bottom plate and the valve body cylinder bottom plate, a drainage hole is formed in the piston top plate, and a drainage pipe is connected to the valve body cylinder bottom plate. The piston bears the effects of internal water pressure and external water pressure at the same time, when the internal and external water pressure difference is larger than the starting pressure difference set by the piston, the spring is compressed, external water is discharged into the reinforced concrete lining from the interior of the valve body barrel and the drainage pipe, along with the external water discharging, the pressure difference is reduced, the spring extends, the piston moves upwards and then resets, and the device returns to the initial sealing state. The structure damage or instability caused by high external water pressure seepage damage of the lining structure can be avoided.

Description

Technical Field

[0001] The invention relates to the field of engineering technology, and in particular to a device for regulating the water pressure difference between inside and outside of a concrete lining, which is suitable for underground water conservancy and hydropower projects. Background Art

[0002] In the construction of underground pressurized projects in hydropower stations, the external pressure stability of underground caverns is a very prominent problem. According to engineering experience, when the groundwater pressure is too high, it often causes groundwater pressure instability and causes lining damage. At present, most projects at home and abroad adopt measures such as adding drainage pipes, rock wall drainage systems, and devices with insurance diaphragms inside the lining to balance water pressure to reduce groundwater pressure.

[0003] A radial drainage pipe is set within a certain range on the top of the lining to reduce the external water pressure of the lining by draining the fissure water and pore water in the surrounding rock of the cave top. However, for the high external water tunnel section, the surrounding rock permeability coefficient and the external water pressure reduction coefficient of the lining are relatively large, and the pressure reduction effect is only produced on the lining part where the drainage pipe is laid, resulting in uneven external water pressure on the lining, making the drainage pipe susceptible to rupture due to strong impact, which is not conducive to the stable and safe operation of the underground engineering structure; and the drainage holes cannot control drainage in one direction, and the internal water is prone to reverse discharge, making the drainage holes easily blocked by mud and sand, so that the drainage hole system fails; the ultimate water pressure value of the plastic wrap sheet inside the lining that balances the internal and external water pressures needs to be calculated based on the actual cross-sectional parameters of the underground building, but in actual engineering, the external water pressure of the underground structure is variable and highly uncertain.

[0004] Therefore, the existing engineering measures are very likely to have adverse effects on hydraulic structures during operation, resulting in new engineering problems. Summary of the invention

[0005] In view of this, the present invention provides a device for regulating the internal and external water pressure difference of a concrete lining. By utilizing the internal and external water pressure difference of the hydraulic structure itself and the elasticity of the spring inside the device, the adaptive anti-seepage and pressure reduction effect of the concrete lining structure of a deep-buried pressurized underground project under different external water pressures is achieved, and the damage or instability of the structure caused by the seepage destruction of the high external water pressure of the lining structure is avoided. The problem of high external water pressure of the hydraulic structure under deep-buried complex geological conditions is completely solved, and better construction and utilization value is provided for similar geological projects.

[0006] A device for regulating the water pressure difference between inside and outside of a concrete lining, comprising a valve body cylinder, a piston, a rubber water stop strip and a spring;

[0007] The valve body cylinder has a top plate and a bottom plate, both of which have a central hole, the top plate is used to cooperate with the piston to form a sealing surface, and the bottom plate is used to encapsulate the spring and install the drain pipe;

[0008] The valve body cylinder is buried in the reinforced concrete lining, and the piston is installed inside the valve body cylinder. After the piston is subjected to force, it can move freely up and down inside the valve body cylinder. A rubber water stop strip is arranged between the top plate of the valve body cylinder and the top plate of the piston. Both ends of the spring are connected between the bottom plate of the piston and the bottom plate of the valve body cylinder. A drainage hole is arranged on the top plate of the piston. A drainage pipe is connected to the bottom plate of the valve body cylinder. The preload force of the spring acts on the piston to close the center hole on the top plate of the valve body cylinder. The piston is subjected to the action of the internal water pressure and the external water pressure at the same time. When the internal and external water pressure difference is greater than the starting pressure difference set by the piston, the device is started, the spring is compressed, and the external water enters from the center hole of the top plate of the valve body cylinder and is discharged into the reinforced concrete lining through the drainage hole of the top plate of the piston, the center hole of the bottom plate of the valve body cylinder and the drainage pipe. As the external water is discharged, the pressure difference decreases, the spring stretches, the piston resets after moving up, and the device returns to the initial sealing state. Different device starting pressure differences are set by adjusting the initial compression amount of the spring to accurately control the internal and external water pressure differences.

[0009] Furthermore, anchor holes are reserved on the bottom plate of the valve body cylinder, and the entire differential pressure regulating device is connected to the concrete lining by placing anchors in the anchor holes.

[0010] Furthermore, the pressure difference regulating device is arranged to be aligned with the center line of the concrete lining.

[0011] Furthermore, the gap between the pressure difference regulating device and the reinforced concrete lining excavation surface is filled with filter material.

[0012] Furthermore, the valve body cylinder is made of stainless steel or other materials with good durability and strength that meets requirements.

[0013] Beneficial effects:

[0014] 1. The present invention can ensure that under the external water pressure conditions of different projects, the rubber water stop strip that automatically closes and opens due to the elasticity of the spring and the internal and external water pressure difference can effectively control adverse conditions such as internal water seepage, improve the overall stress conditions of the lining structure, improve the safety of the lining structure, maximize the economic benefits of the project, and provide a good reference for similar deep-buried high-water pressure hydraulic structure projects.

[0015] 2. The main structure of the present invention is composed of a valve body cylinder, a piston, a rubber water stop strip and a spring. The valve body cylinder is pre-buried in the reinforced concrete lining, and the piston and the spring are installed inside the cylinder through the bottom plate of the valve body cylinder. It is easy to disassemble and has a simple construction process. The gap between the pressure difference regulating device and the excavation surface of the reinforced concrete lining is filled with filter material, which can effectively block mud and sand. The valve body cylinder is made of stainless steel metal or other materials with good durability and strength that meet the requirements. The device is rust-resistant and not easy to crack.

[0016] 3. The present invention reserves anchor holes on the bottom plate of the valve body tube, and the entire structural device is connected to the concrete lining by placing anchors in the anchor holes, which can prevent the device from shaking and affecting the structural stability during the process of balancing the internal and external water pressures. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 and 2 This is a schematic diagram of the installation position of the full-section pressure difference regulating device of the present invention;

[0018] Figure 3 It is a cross-sectional view of the initial state of the pressure difference regulating device of the present invention;

[0019] Figure 4 It is a cross-sectional view of the pressure difference regulating device of the present invention in the starting state;

[0020] Figure 5 A top view of the pressure difference regulating device of the present invention;

[0021] Figure 6 It is a cross-sectional view of the piston and spring of the present invention.

[0022] Among them, 1-reinforced concrete lining, 2-valve body cylinder, 2-1-top plate, 2-2-bottom plate, 3-piston, 3-1-top plate, 3-2-bottom plate, 4-spring, 5-anchor hole, 6-filter material, 7-rubber water stop strip, 8-drainage hole, 9-drainage pipe. DETAILED DESCRIPTION

[0023] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0024] The present invention provides a device for regulating the water pressure difference between inside and outside of a concrete lining. The reinforced concrete lining 1 is buried inside the surrounding rock mass. The annular space inside the reinforced concrete lining 1 is a tunnel. Figure 1 and 2 As shown, the pressure difference regulating device of the present invention is evenly arranged on the reinforced concrete lining 1 along the circumferential direction and the axial direction.

[0025] As attached Figure 2 As shown, the pressure difference regulating device includes a reinforced concrete lining 1, a valve body cylinder 2, a piston 3, a spring 4, a filter material 6, a rubber water stop strip 7 and a drainage pipe 9.

[0026] The valve body cylinder 2 is buried in the reinforced concrete lining 1 and is closely connected to the reinforced concrete lining 1. The piston 3 is installed inside the valve body cylinder 2 and can move freely up and down after being subjected to force. A rubber water stop strip 7 is provided between the top plate 2-1 of the valve body cylinder 2 and the top plate 3-1 of the piston 3. The spring 4 is connected between the bottom plate 3-2 of the piston 3 and the bottom plate 2-2 of the valve body cylinder 2. A drainage hole 8 is provided on the top plate 3-1 of the piston 3. Figure 5As shown, when the piston 3 moves downward, external water flows into the valve body cylinder 2 through the drainage hole 8, and the central hole of the bottom plate 3-2 of the piston 3 is connected to the drainage pipe 9. The external water enters the valve body cylinder 2 from the drainage hole and finally drains the seeping external water through the drainage pipe 9. The entire device is aligned with the center line of the concrete lining, and the gap between the device and the excavation surface is filled with anti-filter material 6 to prevent the device from being blocked.

[0027] The rubber water stop strip 7 is tightly attached to the top plate 2-1 of the valve body cylinder 2, and achieves the purpose of sealing and water stopping by squeezing the top plate 3-1 of the piston 3 to prevent the internal water from seeping out. Figure 3 shown.

[0028] The piston 3 is subjected to the internal water pressure P1 and the external water pressure P2 at the same time. When ΔP=P2-P1 reaches the set pressure difference P, the piston 3 can move downward and compress the spring 4 at the same time, and the external water is discharged into the cave. Figure 4 As shown, as the external water is discharged, the pressure difference decreases, the spring 4 stretches, and the piston 3 moves upward until the top plate 2-1 of the valve body cylinder 2 is squeezed tightly against the top plate 3-1 of the piston 3.

[0029] The initial compression length of spring 4 is Different pressure differences can be set by adjusting the height of the piston 3 or the initial compression of the spring for precise control.

[0030] As attached Figure 6 As shown, the piston 3 and the spring 4 are independent parts, which can be installed, repaired and replaced in part or in whole. The replacement is convenient and does not damage the lining concrete structure.

[0031] Anchor holes 5 are reserved on the bottom plate 2-2 of the valve body tube 2, and the entire structural device is connected to the concrete lining 1 by placing anchors in the anchor holes 5 to prevent the device from shaking and affecting the structural stability during the process of balancing the internal and external water pressures.

[0032] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for regulating the water pressure difference between inside and outside of a concrete lining, characterized in that: It includes a valve body cylinder, a piston, a rubber water stop strip and a spring; The valve body cylinder comprises a top plate and a bottom plate, both of which have a central hole, the top plate is used to cooperate with the piston to form a sealing surface, and the bottom plate is used to encapsulate the spring and install the drain pipe; The valve body cylinder is buried in the reinforced concrete lining, and the piston is installed inside the valve body cylinder. After the piston is subjected to force, it can move freely up and down inside the valve body cylinder. A rubber water stop strip is arranged between the top plate of the valve body cylinder and the top plate of the piston. Both ends of the spring are connected between the bottom plate of the piston and the bottom plate of the valve body cylinder. A drainage hole is arranged on the top plate of the piston. A drainage pipe is connected to the bottom plate of the valve body cylinder. The preload force of the spring acts on the piston to close the center hole on the top plate of the valve body cylinder. The piston is subjected to the action of the internal water pressure and the external water pressure at the same time. When the internal and external water pressure difference is greater than the starting pressure difference set by the piston, the device is started, the spring is compressed, and the external water enters from the center hole of the top plate of the valve body cylinder and is discharged into the reinforced concrete lining through the drainage hole of the top plate of the piston, the center hole of the bottom plate of the valve body cylinder and the drainage pipe. As the external water is discharged, the pressure difference decreases, the spring stretches, the piston resets after moving up, and the device returns to the initial sealing state. Different device starting pressure differences are set by adjusting the initial compression amount of the spring to accurately control the internal and external water pressure differences.

2. The device for regulating the water pressure difference between inside and outside of a concrete lining according to claim 1, characterized in that: Anchor holes are reserved on the bottom plate of the valve body cylinder, and the entire differential pressure regulating device is connected to the concrete lining by placing anchors in the anchor holes.

3. The device for regulating the water pressure difference between inside and outside of a concrete lining as claimed in claim 2, characterized in that: The pressure difference regulating device is arranged in alignment with the center line of the concrete lining.

4. The device for regulating the water pressure difference between inside and outside of a concrete lining as claimed in claim 3, characterized in that: The gap between the pressure difference regulating device and the reinforced concrete lining excavation surface is filled with filter material.

5. The device for regulating the water pressure difference between inside and outside of a concrete lining according to claim 3 or 4, characterized in that: The valve body cylinder is made of stainless steel metal material.

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