Dam downstream dam foot anti-impact structure and damage repairing method

Abstract

The invention relates to the technical field of water conservancy project dam protection, in particular to a dam downstream dam foot anti-impact structure and a damage repairing method.The dam downstream dam foot anti-impact structure comprises a hexahedron protection part which is arranged at a hexahedron protection area on a dam foot weight body slope and comprises a plurality of hexahedrons A continuously installed along the dam foot weight body slope; the hexahedron B is mounted above the hexahedron A and forms a continuous step structure along the slope surface of the dam foot weight body; at least two layers of tetrahedrons are arranged in the downstream direction of the dam foot ballasting body; according to the anti-impact structure for the downstream dam foot of the dam, through the creative structural design of the tetrahedrons, the hexahedrons A and the hexahedrons B, an overall structure with the anti-impact capacity can be formed, the problem that an existing dam body structure is prone to being scoured and eroded by flowing water in the using process is effectively solved, and the anti-impact performance and the using durability of a dam body can be remarkably improved; the damage repairing method is clear and standard in step, and effective and orderly repairing work and repairing quality can be guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of dam protection in water conservancy projects, in particular to a dam downstream dam foot erosion-resistant structure and a damage repair method. BACKGROUND

[0002] As important water conservancy project facilities, dams play a key role in flood control, irrigation, power generation, etc. However, the dam downstream dam foot is subjected to water flow scouring and other effects for a long time, and is prone to damage, such as dam foot scouring, slope body slope foot damage, and slope concrete damage. If these problems are not addressed in a timely manner, the stability and safety of the dam will be affected, and even serious engineering accidents may occur. Currently, there are some deficiencies in the erosion resistance and repair of the dam downstream dam foot. The existing erosion-resistant structures are often single in form and have limited protection effect, making it difficult to effectively resist the long-term scouring of water flow. In terms of repair methods, there is a lack of systematic and standardized steps, and the details in the repair process are not perfect, resulting in unsatisfactory repair effect and the repaired dam foot is still prone to damage. Therefore, it is necessary to improve the erosion resistance and repair quality of the dam downstream dam foot. In view of this, we propose a dam downstream dam foot erosion-resistant structure and a damage repair method. SUMMARY

[0003] The purpose of the present application is to solve the problems mentioned in the background art and provide a dam downstream dam foot erosion-resistant structure and a damage repair method.

[0004] To solve the above technical problems, the present application adopts the following technical solutions: The dam downstream dam foot erosion-resistant structure comprises: A hexahedral protection part is arranged at a hexahedral protection area on the dam foot weight body slope surface, and comprises a plurality of hexahedral A installed continuously along the dam foot weight body slope surface, and a hexahedral B installed above the hexahedral A to form a continuous stepped structure along the dam foot weight body slope surface. A tetrahedron is arranged at least in two layers in the direction from the dam foot weight body to the downstream.

[0005] Preferably, the concrete strength of the tetrahedron, the hexahedral A and the hexahedral B is not less than C25.

[0006] Preferably, the hexahedral A is in the form of a right trapezoidal column structure, and a first inverted trapezoidal groove is arranged at the right angle waist side of the hexahedral A. The first inverted trapezoidal groove is provided with a slope surface arranged symmetrically and having a slope ratio of 1:0.5 on both sides.

[0007] Preferably, the hexahedral B is in the form of a rectangular column structure, and a second inverted trapezoidal groove is arranged at one side of the hexahedral B. The second inverted trapezoidal groove is provided with slope surfaces symmetrically arranged and having a slope ratio of 1:0.5.

[0008] Preferably, a lifting ring is fixedly installed at the tetrahedron top end, the first inverted trapezoidal groove and the second inverted trapezoidal groove.

[0009] Preferably, the hexahedron A and the hexahedron B are longitudinally connected in series by 4-8 steel wire ropes as a group.

[0010] Preferably, the hexahedron A or the hexahedron B transversely adjacent to each other are staggered.

[0011] The damage repair method of the downstream dam foot erosion-resistant structure of a dam comprises the following steps: Step one: damage inspection, checking the damage condition of the dam foot weight body and the dam foot erosion-resistant structure, including the position, range, degree of damage, etc., and determining the specific area to be repaired; Step two: repairing the damaged concrete on the slope surface, cleaning and repairing the slope of the damaged part of the dam foot weight body, removing the damaged concrete and sundries, and pouring concrete on the slope top and slope surface to form a slope layer; Step three: pouring underwater concrete at the dam foot, for the damaged part of the dam foot weight body, in order to prevent the dam foot scouring from further expanding and the loss of the granular soil of the weight body, C20W6F100 underwater concrete is poured at the dam foot; Step four: laying tetrahedrons, transporting the prefabricated tetrahedrons to the construction site, hoisting according to the arrangement requirements, connecting every 4-8 tetrahedrons by 6x19W+IWR steel core steel wire ropes with a tensile strength of 1770KPa to enhance the overall stability, and laying at least two layers; Step five: laying hexahedron A and hexahedron B, arranging the hexahedron A at the slope surface concrete formed by pouring on the slope surface, installing the hexahedron B on the hexahedron A, layer by layer, to form a continuous step structure for enhancing the erosion resistance of the slope surface; Step six: checking and adjusting, after the repair work is completed, the entire repair area is comprehensively checked.

[0012] Preferably, in step two, the residual materials and sundries on the slope surface are removed, the depth of excavation is 30-40cm, 200g / m 2 of polyester staple fiber needled geotextile is laid to prevent the loss of granular soil on the slope surface, C15 slope surface concrete and slope top concrete are poured to form a slope layer, and the thickness of the slope layer is not less than 20cm.

[0013] Compared with the prior art, the method has the following beneficial effects: 1. The dam downstream dam foot impact-resistant structure, the tetrahedron, hexahedron A, hexahedron B structure design, can form a whole structure with impact resistance, effectively alleviate the dam structure in the process of use prone to water scouring, erosion problem, can significantly improve the dam's anti-impact performance and durability; 2. The application damage repair method steps clear, standard, can guarantee effective and orderly repair work and repair quality; 3. The application through the original slope damage cleaning slope, and laying geotextile to prevent slope fine soil loss, and then pouring slope concrete, can effectively prevent the dam foot further expansion and slope soil loss, realize the effective repair of damaged slope, is conducive to improve the stability and safety of the dam. BRIEF DESCRIPTION OF DRAWINGS

[0014] The drawings accompanying the specification of this application form a part of the disclosure of the application and serve to further provide a further understanding of the application, the illustrative embodiments of the application and the description thereof serve to explain the application and do not constitute an improper limitation of the application. In the drawings: Figure 1 It is the top view of the dam foot impact-resistant structure embodiment of the application; Figure 2 It is the side view of the dam foot impact-resistant structure embodiment of the application; Figure 3 It is the installation relationship diagram of hexahedron A and hexahedron B of the application; Figure 4 It is the schematic diagram of hexahedron A of the application; Figure 5 It is the cross-sectional view of hexahedron A of the application; Figure 6 It is the schematic diagram of hexahedron B of the application; Figure 7 It is the cross-sectional view of hexahedron B of the application; Figure 8 It is the schematic diagram of tetrahedron of the application; Figure 9 It is the flow chart of the repair method of the application.

[0015] The meaning of each mark in the figure is: 1. Tetrahedron; 2. Hexahedron A; 21. First inverted trapezoidal groove; 3. Hexahedron B; 31. Second inverted trapezoidal groove. DETAILED DESCRIPTION

[0016] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. In the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0017] See also Figures 1-9 The present invention describes the above technical solution in detail through the following embodiments: The downstream dam foot anti-scour structure of this embodiment is as follows: Figures 1-2 In the structure shown, a hexahedron protection part is provided at the hexahedron protection area on the slope of the dam foot weight body, and two layers of tetrahedrons 1 are laid within a range of 20m from the dam foot weight body to the downstream direction.

[0018] like Figure 2 In the structure shown, in this embodiment, the hexahedron A2 is continuously installed along the slope of the dam foot weight body, and the hexahedron B3 is horizontally installed above the hexahedron A2. On the whole, a continuous step structure can be formed between the hexahedron A2 and the hexahedron B3 along the slope of the dam foot weight body, thereby improving the anti-scouring ability.

[0019] Specifically, such as Figures 4-7 As shown in the structure, the hexahedron A2 in this embodiment is a right-angled trapezoidal column structure, and a first inverted trapezoidal groove 21 is provided on the right-angled waist side of the hexahedron A2. At the same time, the hexahedron B3 is a rectangular column structure, and a second inverted trapezoidal groove 31 is provided on one side of the hexahedron B3. The slope ratios of both sides of the first inverted trapezoidal groove 21 and the second inverted trapezoidal groove 31 are both 1:0.5. In this embodiment, the tetrahedron 1, hexahedron A2 and hexahedron B3 are all prefabricated using concrete with a strength of C25.

[0020] Specifically, the tetrahedron 1 of this embodiment has a bottom side length of 1.5m and a top side length of 0.3m, and is provided with φ28HPB300 grade round steel as a lifting ring; the hexahedron A2 has a height of 1m, a width of 1.7m, a thickness of 0.15m, and a length of 1.5m, and two φ28HPB300 lifting rings are set in the first inverted trapezoidal groove 21, the bottom width of the groove is 0.3m, and the lifting ring steel bar is in the shape of a "J"; the hexahedron B3 has a height of 1m, a width of 1m, and a length of 1.5m, and a second inverted trapezoidal groove 31 with a bottom width of 0.3m and a top width of 0.5m is set at the top, and two φ28HPB300 lifting rings are also set in the groove.

[0021] The damage repair method of the dam foot anti-scour structure downstream of the dam in this embodiment has the following specific steps: Step 1: Damage inspection. Taking the dry season as an example, the damage to the dam foot weight and scour resistance structure is inspected, including the location, scope, and extent of the damage. The specific areas that need repair are identified and a repair plan is formulated. If local scour damage and structural loosening are found at the dam foot during the inspection, a comprehensive repair of the dam foot can be decided. Step 2: Repair the damaged concrete on the slope, clean and repair the damaged slope of the original dam foot pressure weight, remove residues and debris, excavate and clean to a depth of 30-40cm, and lay 200g / m 2 Polyester staple fiber needle-punched geotextile is used to prevent soil loss on the slope surface, and then C15 concrete is poured as the slope layer with a thickness of 20cm; Step 3: Pour underwater concrete at the toe of the slope. For the damaged areas at the toe of the dam foot weight body due to scouring, pour C20W6F100 underwater concrete at the toe of the slope and vibrate it to compact it to prevent further expansion of the dam foot scouring and loss of granular soil in the weight area. Step 4: Laying the tetrahedrons: First, prefabricate the tetrahedron 1. Inside, a steel skeleton mesh is laid. The steel skeleton mesh consists of a main bar with a diameter of Φ6mm and a support stirrup with a diameter of Φ4mm. The main bars are evenly distributed along the four edges and welded to the support stirrups to form a whole. When hoisting, use 6x19W+IWR steel core wire ropes with a tensile strength of 1770KPa to connect 6 in a group to form a whole, enhance overall stability, and lay two layers; Step 5: Lay hexahedron A and hexahedron B, arrange hexahedron A2 on the slope concrete poured on the slope, install hexahedron B3 on hexahedron A2, arrange them layer by layer, and form a continuous stepped structure to enhance the slope's anti-impact ability. In order to improve the integrity, Figure 3 In the structure shown, six hexahedrons A2 and B3 are connected in series longitudinally by steel wire ropes as a group, and the lateral impact resistance is improved. The adjacent hexahedrons A2 and B3 are staggered. Step 6: Inspection and adjustment. After the repair work is completed, conduct a comprehensive inspection of the entire repair area to check the stability and sealing of the entire structure, and make adjustments if necessary; use an infrared thermometer to detect the temperature of the structure to ensure that the structure remains in the temperature range of 5-30°C within 24 hours, and then conduct a pressure strength test to check whether the bearing capacity meets the design requirements.

[0022] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0023] It is apparent for a person skilled in the art that the present application is not limited to the details of the above described exemplary embodiments, but that it can be implemented in other concrete forms without departing from the spirit or essential characteristics of the application. Therefore, the embodiments should be considered in all respects as illustrative and not restrictive, the scope of the application being defined by the appended claims rather than the above description, and all changes coming within the meaning and equivalency range of the claims are intended to be embraced therein.

Claims

1. The anti-scour structure of the downstream dam foot is characterized by: include: A hexahedron protection portion is provided at a hexahedron protection area on the slope of the dam foot weight body, comprising a plurality of hexahedrons A (2) continuously installed along the slope of the dam foot weight body, and a hexahedron B (3) installed above the hexahedrons A (2) to form a continuous stepped structure along the slope of the dam foot weight body; The tetrahedron (1) has at least two layers arranged at the dam foot pressure weight body in the downstream direction.

2. The dam downstream foot anti-scour structure according to claim 1, characterized in that: The concrete strength of the tetrahedron (1), the hexahedron A (2) and the hexahedron B (3) is not less than C25.

3. The dam downstream foot anti-scour structure according to claim 2, characterized in that: The hexahedron A (2) is in a right-angled trapezoidal column structure, and a first inverted trapezoidal groove (21) is provided on the right-angled waist side of the hexahedron A (2); The first inverted trapezoidal groove (21) is provided with symmetrically arranged slope surfaces with a slope ratio of 1:0.5 on both sides.

4. The dam downstream foot anti-scour structure according to claim 3, characterized in that: The hexahedron B (3) is in a rectangular column structure, and a second inverted trapezoidal groove (31) is provided on one side of the hexahedron B (3); The second inverted trapezoidal groove (31) is provided with symmetrically arranged slope surfaces with a slope ratio of 1:0.5 on both sides.

5. The dam downstream foot anti-scour structure according to claim 4, characterized in that: Hanging rings are fixedly mounted on the top of the tetrahedron (1), the first inverted trapezoidal groove (21), and the second inverted trapezoidal groove (31).

6. The dam downstream foot anti-scour structure according to claim 1, characterized in that: The hexahedrons A (2) and the hexahedrons B (3) are longitudinally connected in series by steel wire ropes in groups of 4 to 8 as a group.

7. The dam downstream foot anti-scour structure according to claim 1, characterized in that: The laterally adjacent hexahedrons A (2) or hexahedrons B (3) are arranged in an alternating manner.

8. A method for repairing a damaged scour-resistant structure at the downstream foot of a dam, applicable to the scour-resistant structure at the foot of a dam according to any one of claims 1 to 7, characterized in that: The damage repair method specifically comprises the following steps: Step 1: Damage inspection: Check the damage of the dam foot weight and dam foot anti-impact structure, including the location, scope, and extent of the damage, and identify the specific areas that need repair; Step 2: Repair the damaged concrete on the slope surface. Clean and repair the damaged slope surface of the dam foot pressure weight, remove the damaged concrete and debris, and pour concrete on the top and slope surface to form a slope layer. Step 3: Pour underwater concrete at the toe of the slope. For the damaged areas of the dam foot weight body, pour C20W6F100 underwater concrete at the toe of the slope to prevent further expansion of the dam foot scouring and loss of weight body granular soil. Step 4: Laying tetrahedrons, transporting the prefabricated tetrahedrons (1) to the construction site, hoisting them according to the layout requirements, connecting every 4-8 tetrahedrons (1) with 6x19W+IWR steel core wire ropes with a tensile strength of 1770KPa to enhance overall stability, and laying at least two layers; Step 5: Lay hexahedron A and hexahedron B, arrange hexahedron A (2) on the slope concrete poured on the slope, install hexahedron B (3) on hexahedron A (2), arrange them layer by layer, and form a continuous stepped structure that enhances the slope's anti-impact capacity; Step 6: Inspection and adjustment. After the repair work is completed, conduct a comprehensive inspection of the entire repair area.

9. The dam downstream foot anti-scour structure and damage repair method according to claim 8, characterized in that: In the second step, the slope residue and debris are removed, the excavation depth is 30-40cm, and 200g / m 2 Polyester staple fiber needle-punched geotextile is used to prevent soil loss on the slope surface. C15 slope surface concrete and slope top concrete are poured to form a slope layer with a thickness of no less than 20cm.

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