Repair structure of structural joints in the bottom slab of energy dissipation pool

Abstract

The present invention belongs to the field of water conservancy and hydropower engineering, and specifically discloses a repair structure for a structural seam of a stilling pool bottom plate with strong resistance to high-speed water flow pulsation pressure damage. The repair structure forms an upper repair groove and a lower repair groove by groove carving, and a seam pressing rod is arranged at the lower part of the structural seam located at the bottom of the lower repair groove, a plastic water-stopping filler is arranged in the lower repair groove, and a newly poured anti-abrasion concrete with a reserved upper part of the structural seam is arranged in the upper repair groove, and a water-stopping part that cuts off the upper part of the structural seam is arranged in the newly poured anti-abrasion concrete. On the one hand, the erosion damage areas on both sides of the structural seam of the stilling pool bottom plate can be effectively repaired, and on the other hand, the water-stopping and anti-erosion capabilities of the repaired structural seam can be improved, so that it has a strong resistance to high-speed water flow pulsation pressure damage.

Description

Technical Field

[0001] The invention belongs to the field of water conservancy and hydropower engineering, and in particular relates to a repair structure for a structural seam of a stilling pool bottom plate. Background Art

[0002] Due to the large size of the bottom plate of the energy dissipation pool downstream of the dam, structural joints are generally set during construction to reduce the impact of uneven settlement and deformation of concrete and foundation. However, as the main structure for flood discharge and energy dissipation, the structural joints of the energy dissipation pool become parts that are easily eroded and damaged, and often become a necessary repair site during periodic inspection and repair.

[0003] At present, when repairing the structural joints of the energy dissipation pool bottom slab, the method of burying water-stopping and filling wooden boards in the joints is generally adopted. However, if only the water-stopping structure is buried, once the water-stopping is damaged, the pulsating pressure of the high-speed water flow will directly affect the entire structural joint and the adjacent construction joints, causing large-scale hole damage to the anti-scour layer of the energy dissipation pool bottom slab along the construction joints. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a repair structure for the structural seam of the bottom plate of the energy dissipation pool which has a strong ability to resist the destructive force of high-speed water flow pulsation pressure.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a repair structure for the structural joint of the bottom plate of the energy dissipation pool, comprising a structural joint arranged on the bottom plate of the energy dissipation pool, the bottom plate of the energy dissipation pool comprising a concrete foundation layer and an anti-impact concrete layer arranged on the upper side of the concrete foundation layer, the structural joint comprising a lower part of the structural joint on the concrete foundation layer and an upper part of the structural joint on the anti-impact concrete layer; the anti-impact concrete layers on both sides of the upper part of the structural joint are processed to form an upper repair groove, and the upper side surfaces of the concrete foundation layers on both sides of the lower part of the structural joint are processed to form a lower repair groove; a filling material is provided in the lower part of the structural joint, and a compression rod is provided at the lower part of the structural joint located at the bottom of the lower repair groove; a plastic water-stopping filler is provided in the lower repair groove, and a newly poured anti-impact concrete is provided in the upper repair groove, the upper part of the structural joint is reserved on the newly poured anti-impact concrete, and a water-stopping part that cuts off the upper part of the structural joint is provided in the newly poured anti-impact concrete.

[0006] Furthermore, the upper repair groove and the lower repair groove are both inverted trapezoidal structures.

[0007] Furthermore, the depth of the lower repair groove is greater than 10 cm, and the bottom width of the lower repair groove is greater than 20 cm.

[0008] Furthermore, the groove wall surface of the upper repair groove is a roughened surface, and an interface agent is coated thereon.

[0009] Furthermore, an emulsified asphalt layer is provided on the seam surface of the upper part of the structural seam in the newly poured anti-impact concrete.

[0010] Furthermore, the waterstop portion is a rubber waterstop strip, a PVC waterstop strip or a waterstop copper sheet arranged perpendicular to the upper part of the structural joint.

[0011] Furthermore, the distance between the water stop portion and the upper surface of the energy dissipation pool bottom plate is 25 to 40 cm.

[0012] Furthermore, the diameter of the seam pressing rod is 12 to 120 mm.

[0013] Furthermore, the seam pressing rod is a rubber rod or a PVC rod.

[0014] The beneficial effects of the present invention are as follows: the repair structure is formed into an upper repair groove and a lower repair groove by processing, and a compression rod is arranged at the lower part of the structural joint located at the bottom of the lower repair groove, a plastic water-stopping filler is arranged in the lower repair groove, and at the same time, a newly cast anti-abrasion concrete with a reserved upper part of the structural joint is arranged in the upper repair groove, and a water-stopping part that cuts off the upper part of the structural joint is arranged in the newly cast anti-abrasion concrete. On the one hand, the erosion damage areas on both sides of the structural joint of the energy dissipation pool bottom plate can be effectively repaired, and on the other hand, the water-stopping and anti-erosion capabilities of the repaired structural joint can be improved, so that it has a strong ability to resist the pulsating pressure damage of high-speed water flow; in addition, the repair structure can also reduce the adverse effect of the pulsating pressure transmitted along the depth of the joint after the failure of the water-stopping part on the new and old concrete bonding surfaces, thereby reducing the possibility of large-scale hole damage to the anti-abrasion concrete layer of the energy dissipation pool bottom plate along the horizontal construction joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the implementation structure of the present invention;

[0016] Marked in the figure are: concrete foundation layer 110, lower repair groove 111, plastic water-stopping filler 112, impact-resistant concrete layer 120, upper repair groove 121, newly poured impact-resistant concrete 122, water-stopping part 123, structural joint 200, lower part of structural joint 210, filling material 211, joint pressing rod 212, upper part of structural joint 220. DETAILED DESCRIPTION

[0017] The present invention will be further described below in conjunction with the accompanying drawings.

[0018] like Figure 1As shown, the repair structure of the structural joint of the bottom plate of the energy dissipation pool includes a structural joint 200 arranged on the bottom plate of the energy dissipation pool, the bottom plate of the energy dissipation pool includes a concrete foundation layer 110 and an anti-abrasion concrete layer 120 arranged on the upper side of the concrete foundation layer 110, the structural joint 200 includes a structural joint lower part 210 located on the concrete foundation layer 110 and a structural joint upper part 220 located on the anti-abrasion concrete layer 120; the anti-abrasion concrete layer 120 on both sides of the structural joint upper part 220 is processed to form an upper repair groove 121, and the concrete on both sides of the structural joint lower part 210 is formed with an upper repair groove 121. A lower repair groove 111 is formed on the upper side of the concrete foundation layer 110; a filling material 211 is provided in the lower part 210 of the structural joint, and a compression rod 212 is provided at the lower part 210 of the structural joint located at the bottom of the lower repair groove 111; a plastic water-stopping filler 112 is provided in the lower repair groove 111, and a newly poured anti-impact concrete 122 is provided in the upper repair groove 121, a structural joint upper part 220 is reserved on the newly poured anti-impact concrete 122, and a water-stopping part 123 for cutting off the structural joint upper part 220 is provided in the newly poured anti-impact concrete 122.

[0019] The repair structure is a structure formed after repairing the structural joints of the energy dissipation pool bottom plate damaged by erosion. During construction, repair grooves are generally formed by processing the erosion areas on both sides of the structural joint 200. The repair grooves can be formed by excavation or by carving using the concrete hard grooving construction method commonly used in this field. The repair grooves include an upper repair groove 121 and a lower repair groove 111. Specifically, the upper repair groove 121 is formed by processing the anti-abrasion concrete layer 120 on both sides of the upper part 220 of the structural joint, and the lower repair groove 111 is formed by processing the upper side surface of the concrete foundation layer 110 on both sides of the lower part 210 of the structural joint. The structures of the upper repair groove 121 and the lower repair groove 111 can be of various types. In order to further reduce the adverse effects of the pulsating pressure transmitted along the depth of the joint after the failure of the water stop 123 on the bonding surface of the new and old concrete, it is preferred that the upper repair groove 121 and the lower repair groove 111 are both processed into an inverted trapezoidal structure.

[0020] On the basis of the above, in order to ensure a good repair effect, it is preferred that the depth of the lower repair groove 111 is greater than 10 cm, and the bottom width of the lower repair groove 111 is greater than 20 cm.

[0021] The plastic water-stop filler 112 is mainly used for further water-stopping of the structural joint 200. The plastic water-stop filler 112 should have the characteristics of good plasticity, strong impermeability, good underwater stability, etc., and is preferably a GB flexible filler or a SR plastic filler.

[0022] The filling material 211 is mainly used to fill the lower part 210 of the structural joint, and it can be of various types, such as: wood board, sponge, foam plastic, etc.; the compression rod 212 is mainly used to stop the structural joint 200 and prevent the pulsating pressure from continuing to be transmitted along the depth of the joint after the water stop part 123 fails; the compression rod 212 can be of various types, preferably a rubber rod or a PVC rod; the diameter of the commonly used compression rod 212 is 12 to 120 mm, and the specific diameter of the compression rod 212 is determined according to the size of the lower part 210 of the structural joint. When selecting, it should be ensured that the compression rod 212 is embedded in the top of the joint of the lower part 210 of the structural joint and cannot be pressed into the lower part 210 of the structural joint, so the diameter of the compression rod 212 should generally be larger than the opening degree of the compression rod 212.

[0023] In order to make the new and old concretes bond tightly, the groove wall surface of the upper repair groove 121 is usually roughened to form a roughened surface, and an interface agent is applied thereon. Usually, scum and loose stones should be cleaned before applying the interface agent. The interface agent treats the groove wall surface of the upper repair groove 121 to improve or completely change its physical and technical properties and surface chemical properties so that the newly poured anti-abrasion concrete 122 and the anti-abrasion concrete layer 120 can be effectively bonded together.

[0024] The newly poured anti-abrasion concrete 122 is the anti-abrasion concrete poured in the upper repair groove 121 during repair, and is newly poured compared with the anti-abrasion concrete previously poured into the anti-abrasion concrete layer 120. The newly poured anti-abrasion concrete 122 set in the upper repair groove 121 should have the characteristics of low shrinkage, high crack resistance, high bonding strength, and high anti-abrasion strength, and generally hydraulic high-toughness anti-abrasion concrete can be used.

[0025] The upper part 220 of the structural joint reserved on the newly poured anti-abrasion concrete 122 corresponds to the lower part 210 of the original structural joint, and its width is generally smaller than the lower part 210 of the structural joint, usually 2 to 3 mm; in order to improve its water-stopping and anti-erosion capabilities without leaving a joint width, an emulsified asphalt layer is usually provided on the joint surface of the upper part 220 of the structural joint in the newly poured anti-abrasion concrete 122.

[0026] The waterstop 123 is mainly used for waterstopping the structural joint 200, and is required to have certain ductility and impact resistance. The waterstop 123 can be of various types, for example: rubber waterstop, PVC waterstop or waterstop copper sheet, etc., and is generally selected according to the flow rate of the high-speed water flow. The waterstop 123 can be arranged in a variety of ways in the newly poured anti-impact concrete 122, and it is preferred to arrange the waterstop 123 perpendicular to the upper part 220 of the structural joint. The burial depth of the waterstop 123 should ensure that the waterstop and the concrete are firmly connected, and will not be exposed over a large area when the concrete surface is eroded and damaged. It should also not be buried too deep to avoid the high-speed water flow from propagating too far in the longitudinal direction in the structural joint 200, causing impact damage to the waterstop. It is preferred that the distance between the waterstop 123 and the upper surface of the energy dissipation pool bottom plate is 25 to 40 cm, and the upper surface of the energy dissipation pool bottom plate is the flow surface.

[0027] Compared with the repair structure formed by the existing "water stop + wooden board" repair method, the repair structure of the structural joint of the energy dissipation pool bottom plate can reduce the adverse effect of the pulsating pressure transmitted along the depth of the joint after the failure of the water stop part 123 on the bonding surface of the new and old concrete, reduce the possibility of large-scale hole damage of the anti-wear concrete layer of the energy dissipation pool bottom plate along the horizontal construction joint, increase the repair period of the bottom plate damage, and have certain economic benefits and safety guarantees.

Claims

1. A repair structure for a structural joint of an energy dissipation pool bottom plate, comprising a structural joint (200) arranged on the energy dissipation pool bottom plate, wherein the energy dissipation pool bottom plate comprises a concrete foundation layer (110) and an anti-impact concrete layer (120) arranged on the upper side of the concrete foundation layer (110), wherein the structural joint (200) comprises a structural joint lower portion (210) located on the concrete foundation layer (110) and a structural joint upper portion (220) located on the anti-impact concrete layer (120); characterized in that: The abrasion-resistant concrete layer (120) on both sides of the upper part (220) of the structural joint is processed to form an upper repair groove (121), and the upper side surface of the concrete foundation layer (110) on both sides of the lower part (210) of the structural joint is processed to form a lower repair groove (111); a filling material (211) is provided in the lower part (210) of the structural joint, and a joint pressing rod (212) is provided at the lower part (210) of the structural joint located at the bottom of the lower repair groove (111); a plastic water-stopping filler (112) is provided in the lower repair groove (111), and a newly cast abrasion-resistant concrete (122) is provided in the upper repair groove (121), the upper part (220) of the structural joint is reserved on the newly cast abrasion-resistant concrete (122), and a water-stopping part (123) for cutting off the upper part (220) of the structural joint is provided in the newly cast abrasion-resistant concrete (122).

2. The repair structure of the structural seam of the stilling pool bottom plate as claimed in claim 1, characterized in that: The upper repair groove (121) and the lower repair groove (111) are both inverted trapezoidal structures.

3. The repair structure of the structural seam of the stilling pool bottom plate as claimed in claim 2, characterized in that: The depth of the lower repair groove (111) is greater than 10 cm, and the width of the bottom surface of the lower repair groove (111) is greater than 20 cm.

4. The repair structure of the structural seam of the stilling pool bottom plate as claimed in claim 1, characterized in that: The groove wall surface of the upper repair groove (121) is a roughened surface, and an interface agent is coated on the surface.

5. The repair structure of the structural seam of the stilling pool bottom plate as claimed in claim 1, characterized in that: An emulsified asphalt layer is provided on the joint surface of the upper portion (220) of the structural joint in the newly poured anti-impact concrete (122).

6. The repair structure of the structural seam of the stilling pool bottom plate according to any one of claims 1 to 5, characterized in that: The water stop portion (123) is a rubber water stop strip, a PVC water stop strip or a water stop copper sheet arranged perpendicularly to the upper portion (220) of the structural joint.

7. The repair structure of the structural seam of the stilling pool bottom plate as claimed in claim 6, characterized in that: The distance between the water stop portion (123) and the upper surface of the energy dissipation pool bottom plate is 25 to 40 cm.

8. The repair structure for the structural seam of the stilling pool bottom plate according to any one of claims 1 to 5, characterized in that: The diameter of the seam pressing rod (212) is 12 to 120 mm.

9. The repair structure of the structural seam of the stilling pool bottom plate as claimed in claim 8, characterized in that: The seam pressing rod (212) is a rubber rod or a PVC rod.

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