Structural joint waterstop structure for concrete gravity dam
By setting grout-stopping holes and seepage-blocking holes in the water-stopping structure of the concrete gravity dam and filling them with grout-stopping plugs, the leakage problem caused by the aging of the water-stopping structure was solved, achieving a highly efficient water-stopping effect and a low-cost maintenance solution.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WUHAN CHANGJIANG KECHUANG TECH DEV
- Filing Date
- 2025-08-01
- Publication Date
- 2026-08-04
AI Technical Summary
In existing technologies, the water-stopping structure of concrete gravity dams ages after long-term operation, leading to a decline or failure in water-stopping performance. When using underwater grouting to repair it, the construction is difficult and the effect is hard to guarantee.
A first joint grout-stopping hole, a joint seepage-blocking hole, and a second joint grout-stopping hole are installed on the concrete dam body. The first grout-stopping plug, the seepage-blocking plug, and the second grout-stopping plug are filled respectively to form a new water-stopping structure and avoid underwater construction.
It effectively prevents water leakage and seepage, improves water-stopping effect, reduces construction difficulty, simplifies construction process, and reduces maintenance costs.
Smart Images
Figure CN224591397U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of water-stopping structure repair technology, specifically to a structural joint water-stopping structure for concrete gravity dams. Background Technology
[0002] Concrete gravity dams are widely used in hydropower projects due to their simple structure, strong adaptability to terrain and geological conditions, and high safety. However, as the dams operate for a long time, the water-stopping structure ages, and its water-stopping performance declines or fails, which can easily lead to water leakage.
[0003] Repairing structural joints typically involves underwater grouting at the upstream face of the joint. For example, Chinese utility model patent CN209128947U, entitled "A Waterproof Structure for Structural Joints in a Hydropower Station Dam," includes a concrete dam body, structural joint, filling layer, sealing layer, joint groove, waterstop layer, grouting pipe, seepage-proof cover plate, expansion bolts, pressure strip, and sealing material layer. The concrete dam body is a slab structure of the hydropower station dam, and structural joints are provided on the concrete dam body. The bottom of the structural joint... The structure is equipped with a filling layer, and a sealing layer is placed above the filling layer. A groove is cut across the top of the structural joint, and the groove is in the shape of an "eight". A grouting pipe is installed above the structural joint, and a water-stopping layer is installed next to the grouting pipe in the groove, with the bottom of the grouting pipe placed inside the sealing layer. A seepage-proof cover is also installed on the outer side of the top of the structural joint, and the seepage-proof cover is fixed to the concrete dam body with expansion bolts. A pressure strip is installed between the seepage-proof cover and the expansion bolts, and a sealing material layer is installed at both ends of the seepage-proof cover.
[0004] The above method usually requires first accurately locating the problem area of the waterstop, and then underwater grouting to seal the problem area at a specific point. Not only is underwater construction difficult, but the effect is also hard to guarantee. Utility Model Content
[0005] The purpose of this utility model is to overcome the above-mentioned technical deficiencies and propose a structural joint water-stopping structure for concrete gravity dams, which solves the technical problems of high underwater construction difficulty and difficulty in guaranteeing water-stopping effect caused by the use of upstream underwater grouting scheme to repair failed water-stopping.
[0006] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution: This utility model provides a structural joint water-stopping structure for concrete gravity dams, configured to connect the concrete dam body, wherein the concrete dam body has at least one failed water-stopping mechanism. The structure is characterized in that the concrete dam body has a first joint sealing plug, a joint seepage-preventing plug, and a second joint sealing plug sequentially spaced apart along a direction away from the failed water-stopping mechanism. The structural joint water-stopping structure for concrete gravity dams includes: The first grout stopper body is sealed and embedded in the first grout stopper hole across the seam. A barrier plug, wherein the barrier plug is sealed and embedded in the cross-slit barrier plug hole; and The second grout stopper body is sealed and embedded in the second grout stopper hole across the joint.
[0007] In some embodiments, the first grout-stopping hole is located on the side of the failed sealant closer to the upstream reservoir.
[0008] In some embodiments, the diameters of the first joint sealing plug, the joint seepage barrier plug, and the second joint sealing plug are all 168 mm.
[0009] In some embodiments, the inclination of the first joint sealing plug, the joint seepage prevention plug, and the second joint sealing plug does not exceed 3‰.
[0010] In some embodiments, the distance between the joint-mounted seepage-blocking plug and the first joint-mounted grout-stopping plug is 0.75m, the distance between the joint-mounted seepage-blocking plug and the second joint-mounted grout-stopping plug is 0.75m, and the positional error of the first joint-mounted grout-stopping plug, the joint-mounted seepage-blocking plug, and the second joint-mounted grout-stopping plug is ±10mm.
[0011] In some embodiments, the depth of the first and second joint sealing holes into the impermeable layer is 3m.
[0012] In some embodiments, the depth of the seam-sealing seepage-blocking plug into the impermeable layer is 1.5m.
[0013] In some embodiments, the first grout stopper is an elastic structure, and the circumferential outer wall of the first grout stopper elastically abuts against the circumferential inner wall of the first grout stopper hole.
[0014] In some embodiments, the second grout stopper is an elastic structure, and the circumferential outer wall of the second grout stopper elastically abuts against the circumferential inner wall of the second grout stopper hole.
[0015] In some embodiments, the barrier plug is an elastic structure, and the circumferential outer wall of the barrier plug elastically abuts against the circumferential inner wall of the slit barrier plug hole.
[0016] Compared with the prior art, the beneficial effects of the structural joint water-stopping structure for concrete gravity dams provided by this utility model include: the concrete dam body is provided with a first joint grout-stopping hole spaced apart from the failed water-stopping hole, and a first grout-stopping plug body is sealed and embedded in the first joint grout-stopping hole; the joint seepage-blocking plug hole and the second joint grout-stopping plug hole are arranged sequentially at intervals relative to the first joint grout-stopping plug hole in a direction away from the failed water-stopping hole; the seepage-blocking plug body is sealed and embedded in the joint seepage-blocking plug hole; and the second grout-stopping plug body is sealed and embedded in the second joint grout-stopping plug hole. Compared to existing technologies, this new method uses a first and a second joint-mounted grout-stopping hole to address the failure of the water-stopping mechanism. The first and second joint-mounted grout-stopping holes are filled with a first grout-stopping plug and a second grout-stopping plug body, respectively, effectively preventing leakage. Furthermore, a joint-mounted seepage-blocking hole and a seepage-blocking plug body are also provided between the first and second joint-mounted grout-stopping holes, further preventing leakage and improving the water-stopping effect. This water-stopping structure does not require underwater construction, reducing construction difficulty and solving the technical problems of existing technologies where underwater construction is difficult and the water-stopping effect is hard to guarantee due to the use of upstream underwater grouting to repair failed water-stopping systems. Attached Figure Description
[0017] Figure 1 This is a cross-sectional view of a structural joint waterstop structure for a concrete gravity dam, provided in one embodiment of this utility model; Figure 2 It is along Figure 1 Sectional view of line AA in the middle; Figure 3 It is along Figure 1 A cross-sectional view along the BB line.
[0018] Explanation of reference numerals in the attached drawings: 100 for concrete dam body; 110 for failed waterstop; 120 for impermeable layer; 200 for first joint grout stop hole; 300 for joint seepage prevention hole; 400 for second joint grout stop hole; 500 for waterstop component; 510 for first grout stop plug; 520 for seepage prevention plug; 530 for second grout stop plug. Detailed Implementation
[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.
[0020] To address the technical challenges of underwater construction and difficulty in guaranteeing water-stopping effect caused by using an upstream underwater grouting method to repair a failed waterstop 110, this utility model provides a structural joint water-stopping structure for concrete gravity dams. This structure enables the installation of a first grout-stopping hole 200 and a second grout-stopping hole 400 relative to the failed waterstop 110. The first and second grout-stopping holes 200 and 400 are respectively filled with a first grout-stopping plug 510 and a second grout-stopping plug 530, effectively preventing leakage. Furthermore, a seepage-blocking plug 300 and a seepage-blocking plug 520 filled within the first and second grout-stopping holes 200 and 400 are also provided between them, effectively preventing seepage and improving the water-stopping effect. Moreover, this water-stopping structure does not require underwater construction, reducing construction difficulty.
[0021] Please see Figures 1 to 3 , Figure 1 This is a schematic diagram of a structural joint water-stopping structure for a concrete gravity dam according to an embodiment of the present invention. The structural joint water-stopping structure for a concrete gravity dam is configured on a concrete dam body 100. The concrete dam body 100 has at least one failed water-stopping structure 110. The concrete dam body 100 is provided with a first grout-stopping hole 200, a seepage-blocking hole 300, and a second grout-stopping hole 400 at intervals along the direction away from the failed water-stopping structure 110. The structural joint water-stopping structure for a concrete gravity dam includes: a first grout-stopping plug 510, a seepage-blocking plug 520, and a second grout-stopping plug 530. The first grout-stopping plug 510 is sealed and embedded in the first grout-stopping hole 200, the seepage-blocking plug 520 is sealed and embedded in the seepage-blocking hole 300, and the second grout-stopping plug 530 is sealed and embedded in the second grout-stopping hole 400.
[0022] In this device, a first joint sealing plug hole 200 and a second joint sealing plug hole 400 are provided relative to the failed water stop 110. The first joint sealing plug hole 200 and the second joint sealing plug hole 400 are respectively filled with a first sealing plug body 510 and a second sealing plug body 530, which can effectively prevent water leakage. At the same time, a joint seepage barrier plug hole 300 and a seepage barrier plug body 520 filled in the joint seepage barrier plug hole 300 are also provided between the first joint sealing plug hole 200 and the second joint sealing plug hole 400, which can effectively prevent leakage and improve the water-stopping effect. Moreover, this water-stopping structure does not require underwater construction, reducing construction difficulty.
[0023] Furthermore, the failure water stop 110 is due to the aging of the water stop structure as the dam operates for a long time, resulting in a decline or failure of the water stop performance, which can easily lead to water leakage in the water stop structure. The failure water stop 110 is a conventional setting known to those skilled in the art, and will not be described in detail here.
[0024] In one embodiment, the first grout-stopping hole 200 is positioned near the upstream reservoir relative to the failed water stop 110.
[0025] The first joint sealing hole 200 is connected to the upstream reservoir. After installation, it forms a new sealing structure together with the original sealing hole, successfully solving the stubborn problem of difficult repair, long construction period, high cost and unreliable effect of sealing failure in concrete gravity dam structures.
[0026] Furthermore, as shown in the figure, Figure 1 Above the second joint sealing hole 400 is the upstream reservoir. Figure 2 The left side of the second joint sealing hole 400 is the upstream reservoir, and the right side of the first joint sealing hole 200 is the downstream reservoir. The top of the first joint sealing hole 200 is the crest of the concrete dam body 100. Figure 3 Above the 300mm seepage-blocking plug hole in the middle joint is the top of the 100mm concrete dam body.
[0027] In one embodiment, the diameters of the first joint sealing plug 200, the joint seepage barrier plug 300, and the second joint sealing plug 400 are all 168 mm.
[0028] By setting the drilling technical parameters of the first joint-sealing grout-stopping hole 200, the joint-sealing seepage-blocking hole 300, and the second joint-sealing grout-stopping hole 400, the joint-sealing grout-stopping hole quality of the joint-sealing grout-stopping hole is ensured, providing relatively closed grouting conditions for the elastic seepage-blocking plug formed by grouting, thereby ensuring the quality of the elastic seepage-blocking plug.
[0029] Furthermore, the first joint sealing plug hole 200, the joint seepage prevention plug hole 300, and the second joint sealing plug hole 400 in this device are all formed by drilling using drilling equipment. This is a conventional setting known to those skilled in the art, and will not be described in detail here.
[0030] In one embodiment, the inclination of the first joint sealing plug 200, the joint seepage prevention plug 300, and the second joint sealing plug 400 does not exceed 3‰.
[0031] By setting the drilling technical parameters of the first joint-sealing grout-stopping hole 200, the joint-sealing seepage-blocking hole 300, and the second joint-sealing grout-stopping hole 400, the joint-sealing grout-stopping hole quality of the joint-sealing grout-stopping hole is ensured, providing relatively closed grouting conditions for the elastic seepage-blocking plug formed by grouting, thereby ensuring the quality of the elastic seepage-blocking plug.
[0032] In one embodiment, such as Figure 1 , Figure 3As shown, the distance between the joint-mounted seepage-blocking plug 300 and the first joint-mounted grout-stopping plug 200 is a, and the value of a is 0.75m. The distance between the joint-mounted seepage-blocking plug 300 and the second joint-mounted grout-stopping plug 400 is also 0.75m. The positional error of the first joint-mounted grout-stopping plug 200, the joint-mounted seepage-blocking plug 300, and the second joint-mounted grout-stopping plug 400 is ±10mm.
[0033] By adopting the above-mentioned drilling technical parameters, the seepage-blocking plug can be accurately positioned, the grouting boundary conditions of the seepage-blocking plug are clear, the grouting pressure is guaranteed, and the quality of the seepage-blocking plug and the seepage-blocking reliability of the plug rod are high.
[0034] In one embodiment, the first joint sealing hole 200 and the second joint sealing hole 400 penetrate into the impermeable layer 120 to a depth of b, where b is 3m.
[0035] By setting the drilling technical parameters of the first joint-sealing grout-stopping hole 200 and the second joint-sealing grout-stopping hole 400, the joint-sealing grout-stopping hole quality is ensured, providing relatively closed grouting conditions for the elastic barrier plug formed by grouting, thereby ensuring the quality of the elastic barrier plug.
[0036] Furthermore, an impermeable layer 120 is provided at the bottom of the concrete dam body 100. The impermeable layer 120 is a conventional feature known to those skilled in the art and will not be described in detail here.
[0037] In one embodiment, such as Figure 2 , Figure 3 As shown, the depth of the seepage-blocking plug 300 penetrating into the impermeable layer 120 is c, and the size of c is 1.5m.
[0038] By adopting the above-mentioned drilling technical parameters, the seepage-blocking plug can be accurately positioned, the grouting boundary conditions of the seepage-blocking plug are clear, the grouting pressure is guaranteed, and the quality of the seepage-blocking plug and the seepage-blocking reliability of the plug rod are high.
[0039] In one embodiment, such as Figure 1 , Figure 3 As shown, the first grout stopper 510 is made of HW polyurethane and has elasticity, and the outer circumferential wall of the first grout stopper 510 elastically abuts against the inner circumferential wall of the first grout stopper hole 200.
[0040] HW polyurethane elastic waterstop rods are made of HW polyurethane material. HW polyurethane can solidify quickly when it comes into contact with water. The upstream grout stop hole is connected to the upstream reservoir. Using HW polyurethane material can effectively prevent grout from overflowing into the upstream reservoir along the structural joint.
[0041] Furthermore, the HW polyurethane material here is a conventional setting known to those skilled in the art, and will not be described in detail here.
[0042] In one embodiment, such as Figure 1 , Figure 3 As shown, the second grout stopper 530 is made of LW polyurethane and has elasticity, and the outer circumferential wall of the second grout stopper 530 elastically abuts against the inner circumferential wall of the second grout stopper hole 400.
[0043] The LW polyurethane elastic waterstop rod is close to the original waterstop structure. The aging original waterstop structure prevents the LW polyurethane grout from overflowing downstream along the structural joint.
[0044] Furthermore, the HW polyurethane material here is a conventional setting known to those skilled in the art, and will not be described in detail here.
[0045] In one embodiment, such as Figures 1 to 3 As shown, the barrier plug 520 is an LW+HW polyurethane mixture and has elasticity. The outer circumferential wall of the barrier plug 520 is in elastic contact with the inner circumferential wall of the barrier plug 300. The ratio of LW polyurethane to HW polyurethane in the barrier plug 520 is 1:1.
[0046] Both LW and HW polyurethane are elastic materials, but LW polyurethane cures significantly faster when exposed to water than HW polyurethane, resulting in a lower strength of the cured structure. Both LW and HW polyurethane elastic grout stoppers are made of elastic materials, allowing them to effectively accommodate the expansion and contraction of structural joints.
[0047] Furthermore, by adjusting the ratio and rationally combining LW and HW polyurethane components, the stability and applicability of the solidified material can be enhanced while maintaining its original properties. Additionally, HW polyurethane has a relatively low cost; by optimizing the ratio of LW to HW polyurethane, the cost structure can be optimized while ensuring the quality of the solidified material. Moreover, elastic polyurethane materials generally have low strength; once the water-stopping structure ages and fails after prolonged use, it can be easily cleaned using a geological drilling rig, and a new elastic seepage-blocking plug can be formed by re-injecting the LW+HW polyurethane mixture. Maintenance is convenient and extremely inexpensive.
[0048] To better understand this utility model, the following is combined with... Figures 1 to 3 The technical solution of this utility model is described in detail below: In the specific working process of this utility model, the concrete dam body 100 is provided with a first joint sealing plug hole 200 spaced apart from the failed water stop 110, and a first sealing plug body 510 is sealed and embedded in the first joint sealing plug hole 200. The joint seepage blocking plug hole 300 and the second joint sealing plug hole 400 are arranged in sequence at intervals relative to the first joint sealing plug hole 200 in a direction away from the failed water stop 110. The seepage blocking plug body 520 is sealed and embedded in the joint seepage blocking plug hole 300, and the second sealing plug body 530 is sealed and embedded in the second joint sealing plug hole 400. Compared to existing technologies, by setting a first joint sealing plug hole 200 and a second joint sealing plug hole 400 in relative failure sealing 110, wherein the first joint sealing plug hole 200 and the second joint sealing plug hole 400 are respectively filled with a first sealing plug body 510 and a second sealing plug body 530, it can effectively prevent water leakage. At the same time, a joint seepage barrier plug hole 300 and a seepage barrier plug body 520 filled in the joint seepage barrier plug hole 300 are also set between the first joint sealing plug hole 200 and the second joint sealing plug hole 400, which can effectively prevent leakage and improve the water-stopping effect. Moreover, this water-stopping structure does not require underwater construction, reducing construction difficulty.
[0049] The construction of this structure includes the following steps: First, the first joint-mounted grout-stopping hole 200 is accurately located according to the original water-stopping structure position. After the hole is formed, LW polyurethane is used to grout in sections from bottom to top to form the first grout-stopping plug 510. Then, 1.5m downstream of the first grout-stopping plug 510 and close to the original water-stopping position, the second joint-mounted grout-stopping hole 400 is set. After the hole is formed, HW polyurethane is used to grout in sections from bottom to top to form the second grout-stopping plug 530. Finally, after the first grout-stopping plug 510 and the second grout-stopping plug 530 have solidified, LW+HW polyurethane mixed in a 1:1 ratio is used to grout in sections from bottom to top to form the seepage-blocking plug 520.
[0050] Among them, the drilling rig for drilling along the joint is a geological drilling rig. To ensure the accuracy of drilling along the joint, the drilling rig model is no less than Y-4. The drilling quality is controlled according to the standard of vertical holes. The length of the segmented grouting section is no more than 5.0m to ensure the grouting effect. Once the water-stopping structure ages and fails after long-term operation, a small geological drilling rig can be used to easily clean the hole and re-inject 1:1 LW+HW polyurethane to form a new seepage-blocking plug rod. The maintenance is convenient and the maintenance cost is extremely low.
[0051] Furthermore, this utility model is installed upstream of the original water-stop structure, forming a new water-stop structure together with the original one. This successfully solves the persistent problems of difficult repair, long construction period, high cost, and unreliable effectiveness in the repair of failed water-stop structures in concrete gravity dams. This utility model's water-stop structure is simple, highly reliable, requires minimal engineering work, and has low construction costs. Implementation does not require draining the reservoir or underwater operations, and does not affect the normal operation of hydraulic structures. It has strong applicability and is easy to construct. The construction process involves only two steps: drilling and grouting, which are simple and have a short construction period. The water-stop structure uses elastic materials, allowing it to adapt well to the expansion and contraction of the structural joints, resulting in good water-stopping performance. If the water-stop structure ages and fails later, only grouting of the seepage-blocking plug is needed, making repair convenient and inexpensive.
[0052] This utility model, through the above-described structure, can solve the technical problems in the prior art where underwater construction is difficult and the water-stopping effect is hard to guarantee due to the use of an upstream underwater grouting scheme to repair the failed waterstop 110.
[0053] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.
Claims
1. A structural joint waterproofing structure for a concrete gravity dam, configured to connect a concrete dam body, wherein the concrete dam body has at least one failed waterproofing seal, characterized in that, The concrete dam body is provided with a first joint sealing plug, a joint seepage-preventing plug, and a second joint sealing plug at intervals along a direction away from the failed waterstop. The structural joint waterstop structure for the concrete gravity dam includes: The first grout stopper body is sealed and embedded in the first grout stopper hole across the seam. A barrier plug, wherein the barrier plug is sealed and embedded in the cross-slit barrier plug hole; and The second grout stopper body is sealed and embedded in the second grout stopper hole across the joint.
2. The structural joint water-stopping structure for concrete gravity dams according to claim 1, characterized in that, The first grout-stopping hole is located on the side of the failed waterstop near the upstream reservoir.
3. The structural joint water-stopping structure for concrete gravity dams according to claim 1, characterized in that, The diameters of the first joint sealing plug, the joint seepage prevention plug, and the second joint sealing plug are all 168 mm.
4. The structural joint water-stopping structure for concrete gravity dams according to claim 1, characterized in that, The inclination of the first joint sealing plug, the joint seepage prevention plug, and the second joint sealing plug does not exceed 3‰.
5. The structural joint water-stopping structure for concrete gravity dams according to claim 1, characterized in that, The distance between the joint-mounted seepage-blocking plug and the first joint-mounted grout-stopping plug is 0.75m, and the distance between the joint-mounted seepage-blocking plug and the second joint-mounted grout-stopping plug is 0.75m. The positional error of the first joint-mounted grout-stopping plug, the joint-mounted seepage-blocking plug, and the second joint-mounted grout-stopping plug is ±10mm.
6. The structural joint water-stopping structure for concrete gravity dams according to claim 1, characterized in that, The depth of both the first and second joint sealing holes into the impermeable layer is 3m.
7. The structural joint water-stopping structure for concrete gravity dams according to claim 1, characterized in that, The depth of the sealing and seepage-blocking holes extending into the impermeable layer is 1.5m.
8. The structural joint water-stopping structure for concrete gravity dams according to claim 1, characterized in that, The first grout stopper is an elastic structure, and the outer circumferential wall of the first grout stopper is elastically in contact with the inner circumferential wall of the first grout stopper hole.
9. The structural joint water-stopping structure for concrete gravity dams according to claim 1, characterized in that, The second grout stopper is an elastic structure, and the outer circumferential wall of the second grout stopper is elastically in contact with the inner circumferential wall of the second grout stopper hole.
10. The structural joint water-stopping structure for concrete gravity dams according to claim 1, characterized in that, The barrier plug is an elastic structure, and the outer circumferential wall of the barrier plug is elastically in contact with the inner circumferential wall of the slit barrier plug hole.