An inverted arch water cushion pond structure adapting to valley deformation

Abstract

The present invention provides an inverted arch water cushion pond structure that can adapt to valley width deformation, including an inverted arch bottom plate, an arch seat, and two side walls, the arch seat is anchored to the mountain, and the inverted arch bottom plate is formed by a plurality of plates tightly connected; the inverted arch bottom plate water cushion pond structure is provided with an elastic structural seam that can eliminate the valley width shrinkage deformation of the mountains on both sides without affecting the load transfer, the elastic structural seam is provided at the joint between the arch seat and the side wall, and the structural seam of the horseway of the side walls on both sides, and the elastic structural seam is filled with a compressible and recoverable elastic material, and this elastic structural seam can meet the elastic compression deformation performance and withstand the scouring of water flow and the action of pulsating water pressure. The present invention can effectively enhance the stability of the water cushion pond bottom plate and meet the safety requirements of high dam flood discharge and energy dissipation; it can also make the water cushion pond adapt to the valley width shrinkage deformation of the mountains on both sides after water storage, can significantly reduce the anchoring engineering of the water cushion pond, save investment, and can be widely used in high mountain canyon large flow and high head flood discharge and energy dissipation building projects.

Description

Technical Field

[0001] The invention relates to an inverted arch water cushion pond structure capable of adapting to valley width deformation, and is suitable for water conservancy and hydropower projects, in particular to concrete dam projects with large flow and high water head in high mountain narrow valleys. Background Art

[0002] The natural conditions in the mountainous areas of western my country are complex, and the flood discharge energy of high dams and large reservoirs in narrow river valleys is huge. Concrete dams discharge flood water through the dam body, and a water cushion pond (or energy dissipation pool) is built behind the dam to form a water cushion for energy dissipation. When the flood discharge power is too large, the pulsating uplift force generated by the water body exceeds the deadweight of the concrete of the water cushion pond bottom plate and its anchoring force, and the bottom plate will become unstable and damaged. In order to avoid the instability and damage of the energy dissipation structure, a water cushion pond (or energy dissipation pool) structure with an inverted arch bottom is adopted. The arch thrust of the inverted arch bottom plate transfers the load to the mountains on both sides, which can significantly improve the structural stability of the water cushion pond (or energy dissipation pool).

[0003] After the reservoir is filled with water, the reservoir banks and downstream slopes of some hydropower projects experience reservoir basin settlement and deformation towards the river valley. This mountain valley shrinkage and deformation phenomenon is more prominent in high dams and large reservoirs in high mountain canyons, which has an adverse effect on hydraulic structures. In some projects, the valley deformation has caused damage to the water cushion pond structure behind the dam, affecting its normal use.

[0004] CN101555687A discloses a high-ground stress narrow valley inverted arch water cushion pond, which is mainly designed to avoid the high stress of the valley bottom during excavation. A large number of anchor piles are arranged at the lower end of the inverted arch bottom plate, which limits the arch effect. Although the anchors are connected by casing, the effect of the anchor piles and the arch thrust cannot be accurately defined, and the influence of valley width deformation is not considered. Summary of the invention

[0005] The purpose of the present invention is to provide a reverse arch water cushion pond structure that can adapt to the deformation of the valley width in order to solve the above problems. The structure can effectively enhance the stability of the bottom plate of the water cushion pond through the arch effect to meet the safety requirements of high dam flood discharge and energy dissipation; and can also make the water cushion pond adapt to the valley width shrinkage deformation of the mountains on both sides after water storage through elastic structural seams. To this end, the present invention adopts the following technical solutions:

[0006] The invention discloses an inverted arch bottom plate water cushion pond structure which can adapt to valley deformation, comprising an inverted arch bottom plate, an arch seat, and side walls on both sides, wherein the arch seat is anchored to the mountain, and the inverted arch bottom plate is formed by a plurality of plates tightly connected, and the inverted arch bottom plate forms an arch thrust to transfer the load to the mountains on both sides through the arch seat; the invention is characterized in that the inverted arch bottom plate water cushion pond structure is provided with an elastic structural seam which can eliminate the valley shrinkage deformation of the mountains on both sides without affecting the load transfer, and the elastic structural seam is arranged at the joint between the arch seat and the side wall, and at the structural seam of the horseway of the side walls on both sides, and the elastic structural seam is filled with compressible and recoverable elastic material, and the elastic structural seam can meet the elastic compression deformation performance and withstand the scouring of water flow and the action of pulsating water pressure.

[0007] Furthermore, the elastic material includes a ball chain-shaped EPDM rubber sheet, and polyurea sealant is used to seal the seam surface.

[0008] Furthermore, the ball chain-shaped EPDM rubber plate has a plurality of arc-shaped raised portions along the length direction, the raised portions and the main body of the plate are made of the same material and are integrated, and the raised portions are arranged in pairs on both sides of the main body of the plate.

[0009] Furthermore, a hollow rubber rod is arranged between the polyurea sealant sealant and the upper end of the ball chain-shaped EPDM rubber plate, and the diameter of the hollow rubber rod is slightly larger than the seam width.

[0010] Furthermore, key grooves are provided between the plates of the inverted arch bottom plate, and between the plates and the arch seats to strengthen the connection.

[0011] Furthermore, two water-stopping copper sheets are provided at the direct joints of the bottom plate, the arch seat and the side wall of the inverted arch water cushion pond to prevent water from seeping down.

[0012] The inverted arch water cushion pond structure combined with the novel elastic structural joint proposed in the present invention can not only effectively transmit the load generated by flood discharge to the mountains on both sides through the arch thrust, effectively improve the stability of the inverted arch water cushion pond, but also significantly reduce the anchoring engineering workload of the water cushion pond and save investment; moreover, it can effectively avoid the influence of the shrinkage and deformation of the mountain valley on the structure, ensure the safe operation of the water cushion pond, and can be widely used in large-flow and high-head flood discharge and energy dissipation building projects in high mountain canyons. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a plan view of the inverted arch water cushion pond of the present invention.

[0014] Figure 2 It is a schematic longitudinal section diagram of the inverted arch water cushion pond structure of the present invention.

[0015] Figure 3 It is a cross-sectional schematic diagram of the novel inverted arch water cushion pond structure of the present invention.

[0016] Figure 4 This is a large-scale drawing of the new elastic structural seam of the present invention.

[0017] Figure 5 yes Figure 4 The enlarged view at A1 in the middle shows the detailed structure of the caulking and surface sealing materials of the elastic structural joint.

[0018] Figure 6 for Figure 3 Enlarged view of A2 in the middle. DETAILED DESCRIPTION

[0019] like Figure 1 to Figure 6As shown, this embodiment is an inverted arch bottom plate water cushion pond structure that adapts to valley deformation, arranged downstream of the dam 1, and the inverted arch bottom plate water cushion pond 2 and the second dam 3 form an energy dissipation water cushion to dissipate the flood discharge energy of the brake dam. The inverted arch water cushion pond 2 is a reinforced concrete structure, and the main structure is composed of an inverted arch bottom plate 2-1 located at the bottom of the riverbed, an arch seat 2-2 at the foot of the slope on both sides, and a bank slope side wall 2-3.

[0020] The anti-arch bottom plate 2-1 is connected into an arch by a plurality of arc-shaped plates with an arc length of about 15m, and key grooves 2-6 are arranged between each plate 2-1 and between each plate 2-1 and the arch seat 2-2 to strengthen the connection and resist radial shearing. The anti-arch bottom plate 2-1 and the arch seat 2-2 form a whole, and the anti-arch bottom plate 2-1 generates an arch thrust on the arch seat 2-2, which is transmitted to the mountains 5 on both sides by the arch seat 2-2. At the same time, the existence of the arch thrust also makes the plates closely combined and the stability is improved.

[0021] The arch seat 2 - 3 is anchored to the mountains 5 on both sides by prestressed anchor cables 2 - 4 to resist the upward component of the arch thrust and bear force together with the mountains 5 .

[0022] Two water-stopping copper sheets 2-7 are arranged between each plate of the inverted arch water cushion pond 2 to prevent water from seeping down; a drainage system 7 is arranged on the foundation of the inverted arch bottom plate 2-1, and the drainage system 7 is composed of criss-crossed drainage corridors 7-1, drainage culverts 7-2 and system drainage holes 7-3, which reduces the bottom uplift pressure and improves the stability of the bottom plate.

[0023] An elastic structural seam 6 is arranged at the joints between the arch seat 2-2 and the side wall 2-3 and the side wall bridleway 2-5. The elastic structural seam 6 has a certain seam width reserved and is filled with compressible and recoverable elastic material, which can adapt to the valley deformation of the mountain 5 and withstand water scouring and pulsating water pressure.

[0024] The width B of the elastic structural seam 6 is determined based on the calculation results of the valley deformation and by analogy with the monitoring results of similar projects, and is set to be 2 to 3 cm.

[0025] The elastic structural seam is filled with a ball-chain-shaped EPDM rubber plate 6-1 of the same thickness as the seam width B. The ball-chain-shaped EPDM rubber plate 6-1 has a plurality of arc-shaped protrusions 6-11 along the length direction (i.e., the height direction of the seam). The protrusions 6-11 and the main body 6-10 of the plate are made of the same material and are integrated. The protrusions 6-11 are arranged in pairs on both sides of the main body 6-10 of the plate. The compressible ball-chain-shaped EPDM rubber plate 6-1 can ensure that the plate 6-1 has sufficient elasticity and toughness to adapt to the deformation difference of the seam walls on both sides, and the seam walls on both sides are evenly stressed, thereby avoiding the extrusion and damage of concrete at the structural seam due to the deformation of the mountain valley on the side wall.

[0026] The surface of the elastic structural joint is sealed with a 3 cm thick high-strength elastic polyurea sealant 6-3. The high-strength elastic polyurea sealant has high tensile strength, a bonding strength with concrete greater than 3Mpa, and a breaking elongation greater than 200%, which protects the filling material in the joint from water erosion and prevents aging.

[0027] A hollow rubber rod 6-2 is arranged between the lower part of the polyurea sealant 6-3 and the ball chain-shaped EPDM rubber plate 6-1. The diameter of the hollow rubber rod 6-2 is slightly larger than the seam width B, which can adapt to the change of the seam width and play a role in auxiliary anti-seepage and preventing the polyurea sealant from penetrating into the seam.

[0028] The above description is only a specific implementation of the present invention, but the protection of the present invention is not limited thereto. Any equivalent changes or substitutions of the technical features of the technical solution that can be thought of by technicians in this technical field are covered within the protection scope of the present invention.

Claims

1. An inverted arch water cushion pond structure adapting to valley deformation, comprising an inverted arch bottom plate, an arch seat, and side walls on both sides, wherein the arch seat is anchored to the mountain, the inverted arch bottom plate is formed by a plurality of plates tightly connected, and the inverted arch bottom plate forms an arch thrust to transfer the load to the mountains on both sides through the arch seat, characterized in that: Keyways are provided between the plates and between the plates and the arch seats to strengthen the connection and resist radial shearing. There are no anchor piles at the bottom of the plates. The anti-arch water cushion pond structure is provided with elastic structural seams that can eliminate the valley shrinkage deformation of the mountains on both sides without affecting the load transfer. The elastic structural seams are provided at the seams between the arch seats and the side walls and the structural seams of the horseways on the side walls on both sides. The elastic structural seams are filled with compressible and recoverable elastic materials. The elastic material includes a ball-chain-shaped EPDM rubber sheet, and a polyurea sealant is used to seal the seam on the surface of the seam; a hollow rubber rod is arranged between the polyurea sealant and the upper end of the EPDM rubber sheet, and the diameter of the hollow rubber rod is slightly larger than the seam width; The ball chain-shaped EPDM rubber plate has a plurality of arc-shaped protruding parts along the length direction. The protruding parts and the main body of the plate are made of the same material and are integrated. The protruding parts are arranged in pairs on both sides of the main body of the plate.

2. The inverted arch water cushion pond structure adapted to valley width deformation as claimed in claim 1, characterized in that Two water-stopping copper sheets are arranged between all the plates of the bottom plate, the arch seat and the side wall of the inverted arch water cushion pond to prevent water from seeping down.

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