A construction method for water-stopping structure at dam joints

Abstract

This invention belongs to the field of water conservancy engineering technology, specifically relating to a construction method for a water-stopping structure at the joint of a dam body. Unlike the existing technology that uses bolts to secure the protective cover plate, this technical solution adds irregular grooves on both sides of the panel joint. When installing the water-stopping structure, the two ends of the protective cover plate are pre-embedded in the irregular grooves, and the protective cover plate is fixed by fasteners. Epoxy mortar is then filled into the irregular grooves, achieving a complete seal between the protective cover plate and the concrete joint. This solves the technical problem of water seepage from the joint in the existing technology. Furthermore, this technical solution does not require drilling holes in the concrete panel with expansion bolts, thus avoiding damage to the structure of the panel body and mitigating the risk of cracks in the dam panel.

Description

Technical Field

[0001] This invention belongs to the field of water conservancy engineering technology, specifically relating to a construction method for a water-stopping structure at the joints of a dam body. Background Technology

[0002] In dam construction, the dam body is typically composed of multiple panels, which need to be connected to ensure the integrity and stability of the dam. The joints between these panels are called seams. The design and treatment of seams are crucial in dam engineering because they directly affect the dam's waterproofing performance, stability, and overall structural safety.

[0003] In existing joint sealing construction techniques, the joints between panels are the main leakage channels of the dam. Therefore, once the joint sealing structure is damaged, it will form a seepage channel, causing the anti-seepage system to fail. Water flow will erode the soil and foundation, resulting in the separation of the concrete panel from the subbase material, leading to dam settlement and deformation. If the dam leakage problem is not repaired in time, it may increase the risk of dam failure, leading to flooding and endangering downstream areas, which is detrimental to the safe operation of the dam.

[0004] The information disclosed in the background section above is only used to enhance the understanding of the background art of the art described herein. Therefore, the background art may contain certain information that does not constitute prior art known to those skilled in the art in this country. Summary of the Invention

[0005] To address the shortcomings of the existing technology, this invention proposes a construction method for a water-stopping structure at the joints of a dam body.

[0006] The technical solution adopted in this invention is as follows:

[0007] A construction method for a dam body joint waterproofing structure includes:

[0008] S1: When pouring concrete for the panel, foundation trench molds are pre-embedded at the panel joints and on both sides of the joints.

[0009] S2: Before filling, the foundation trench mold is removed to form the foundation trench, which includes the V-shaped groove at the joint and the irregular grooves on both sides of the joint;

[0010] S3: After mixing the base adhesive, apply it to the seam surface in the V-groove with a brush;

[0011] S4: About 15-50 minutes after the primer is applied, install a rubber rod on the upper side of the joint of the V-groove, and fill the upper side of the rubber rod with flexible filler. The lower end of the flexible filler is triangular and the upper end is a rounded surface.

[0012] S5: Immediately cover the protective cover plate after filling. The upper part of the protective cover plate fits with the arc surface of the flexible filler, and both ends of the protective cover plate are respectively located in the special-shaped grooves.

[0013] S6: Ensure that both ends of the protective cover plate fit with the inner walls of the special-shaped grooves. Fixing parts are installed at both ends of the protective cover plate, and sealing material is filled in the special-shaped grooves.

[0014] In the preferred technical solution, the steps S2 and S3 further include a base groove cleaning step. Use a wire brush to clean the base groove and remove foreign matters in the base groove.

[0015] As a further description of the above technical solution:

[0016] If there are honeycombed pitted surfaces on the inner wall of the base groove, use polymer mortar for leveling and grind the protruding parts. Subsequently, scrub the joint surface with clean water or a wet cloth and dry it with a blowtorch.

[0017] In the preferred technical solution, the primer is composed of adhesives of two components A and B, and the weight ratio of the components is 10:1.3 - 10:1.5, and it should be used up within 1 - 2 hours.

[0018] In the preferred technical solution, the shape of the special-shaped groove is a long-strip groove, and its cross-sectional shape is a quasi-rectangle. An arc depression that sinks inward is provided at the lower left part of the quasi-rectangle, and the upper right part of the quasi-rectangle is set as an inclined slope.

[0019] As a further description of the above technical solution:

[0020] The protective cover plate includes an arc part that fits with the flexible filler and a clamping part that fits with the special-shaped groove. The shape of the clamping part is adapted to the inner wall of the special-shaped groove close to the joint. The shape of the clamping part is L-shaped, and an arc convex that is adapted to the arc depression is provided at the corner.

[0021] As a further description of the above technical solution:

[0022] The shape of the fixing part is a "soil"-shaped structure, including a first cross bar, a second cross bar, and a vertical bar. The first cross bar and the second cross bar are parallel to each other, and the vertical bar is vertically connected to the middle parts of the first cross bar and the second cross bar.

[0023] The fixing part is press-fitted above the clamping part, and the first cross bar is installed in the arc convex of the clamping part.

[0024] In the preferred technical solution, the sealing material is selected as epoxy mortar:

[0025] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0026] Unlike existing technologies that use bolts to fix the protective cover plate, this technical solution adds irregular grooves on both sides of the panel joint. When installing the water-stop structure, the two ends of the protective cover plate are pre-embedded in the irregular grooves. The protective cover plate is fixed by fasteners, and epoxy mortar is filled into the irregular grooves to achieve a complete seal at the connection between the protective cover plate and the concrete. This solves the technical problem of water seepage at the connection between the protective cover plate and the dam panel in existing technologies. Furthermore, this technical solution does not require drilling holes in the concrete panel with expansion bolts, thus avoiding damage to the structure of the panel body and mitigating the risk of cracks in the dam panel. Attached Figure Description

[0027] The present invention will be described by way of example and with reference to the accompanying drawings, wherein:

[0028] Figure 1 This is a schematic diagram of a joint waterproofing structure in the prior art.

[0029] Figure 2 This is a schematic diagram of the joint waterproofing structure in this invention;

[0030] Figure 3 This is a schematic diagram of the structure of the fastener in this invention.

[0031] Figure 4 This is a flowchart of the construction method for the water-stopping structure of the dam body joint in this invention.

[0032] Figure label:

[0033] Panel-1; Seam-2; Rubber rod-3; V-groove-4; Irregular groove-5; Flexible filler-6;

[0034] 7. Protective cover plate; 8. Fastener; 9. Sealant; 10. Expansion bolt assembly; 11. Flat steel pressure plate;

[0035] First horizontal bar - 801; Second horizontal bar - 802; Vertical bar - 803. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0037] In the description of the embodiments of this application, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0038] In dam construction, the dam body is typically composed of multiple panels 1, which need to be connected to ensure the integrity and stability of the dam body. The joints between these panels 1 are called joints 2. The design and treatment of joints 2 are very important in dam engineering because they directly affect the dam body's waterproof performance, stability, and overall structural safety.

[0039] See Figure 1 The traditional water-stopping structure and process for joint 2 involves filling the V-groove with flexible filler 6, covering the upper side of the flexible filler 6 with a protective cover plate 7, and setting flat steel pressure plates 11 at both ends of the protective cover plate 7, which are connected to the panel 1 body through expansion bolt assemblies 10. An edge sealant is used to seal the connection between the protective cover plate 7 and the dam panel 1. However, during long-term use, the above process has revealed several problems:

[0040] 1) Since the dam panel 1 is made of concrete, its surface has low flatness, which leads to gaps at the connection between the protective cover plate 7 and the dam panel 1. Even if an edge sealant is installed, the edge sealant will be corroded and aged during long-term exposure to the sun. In addition, the flat steel pressure plate 11 may deform under thermal expansion and contraction, causing rainwater to seep into the interior of the panel 1 from the joint 2 between the panels 1. This will cause the anti-seepage system to fail, and the flowing water will wash away the soil and foundation, resulting in the concrete panel 1 and the cushion material becoming separated, leading to dam settlement and deformation.

[0041] 2) Stainless steel pressure plates are provided at both ends of the protective cover plate 7 and are connected to the panel 1 body through expansion bolt assembly 10. On the one hand, the expansion bolts will damage the concrete structure of the dam body. On the other hand, the expansion bolts with insufficient rust prevention performance will also damage the concrete, which will increase the risk of cracks in the dam panel 1.

[0042] 3) The installation of flat steel pressure plate 11 and expansion bolt assembly 10 is time-consuming and labor-intensive.

[0043] To address the aforementioned technical problems, the present invention makes the following improvements to the water-stopping structure and construction process:

[0044] Example 1

[0045] A construction method for a dam body joint water-stop structure, see reference. Figure 2 , 4 ,include:

[0046] S1: When pouring concrete for panel 1, foundation trench molds are pre-embedded in panel 1 joint 2 and on both sides of joint 2. Specifically, the foundation trench molds include V-shaped trench molds and irregular trench 5 molds. The V-shaped trench molds are located in front of joint 2, and there are two irregular trench 5 molds, located on both sides of joint 2 respectively.

[0047] S2: During concrete pouring, various joints 2 are pre-embedded in the foundation trench mold to conform to the dimensions specified in the design. Before filling, the foundation trench mold is removed to form the foundation trench, which includes the V-shaped groove 4 at the joint 2 and the irregular grooves 5 on both sides of the joint 2. Then, the trench is cleaned with a wire brush to remove oil stains, debris, emulsion, and loose soil. If there is honeycomb-like pitting, it needs to be leveled with polymer mortar and the protruding parts are ground down. Subsequently, the joint surface is wiped with clean water or a damp cloth and dried with a blowtorch.

[0048] S3: After cleaning the seam surface as required, a primer needs to be applied. This primer is SK primer, composed of two components, A and B, which need to be mixed according to the ambient temperature. Typically, at 20℃, the mixing ratio is A:B = 10:1.3 (by weight); while at 10℃, the ratio is A:B = 10:1.5 (by weight). During application, the total amount of material mixed at one time should not be too much, generally not exceeding 2kg. The amounts of components A and B should be evenly mixed and used within 1-2 hours. Prolonged mixing may cause explosive polymerization, i.e., the liquid rapidly solidifies and expands in volume. After mixing the primer, apply it to the treated and dried seam surface with a brush.

[0049] S4: Approximately 15-50 minutes after applying the primer, install a rubber rod 3 on the upper side of the joint 2 of the V-groove 4. The rubber rod 3 is long and strip-shaped, covering the joint 2 directly above it. Flexible filler 6 is then filled on top of the rubber rod 3. The rubber rod 3 deforms under the pressure of the flexible filler 6, increasing the water-stopping effect of the joint 2. The flexible filler 6 itself has a certain degree of elasticity, allowing the panel 1 to deform as it expands due to heat. The flexible filler 6 is machined with a triangular bottom and a rounded top. The triangular shape allows for better fit with the V-groove, increasing its sealing performance, while the rounded top is for fit with the protective cover plate 7. During the installation of the flexible filler 6, it is important to ensure that air is expelled from between the filler and the concrete bonding surface. If the ambient temperature is low and the filler is somewhat brittle, it can be heated with a blowtorch to improve the adhesion of the filler surface, making subsequent installation easier.

[0050] S5: Immediately after filling, cover with the protective cover plate 7. The upper part of the protective cover plate 7 fits against the arc surface of the flexible filler 6, and the two ends of the protective cover plate 7 are respectively located in the irregular groove 5.

[0051] S6: Ensure that both ends of the protective cover plate 7 fit snugly against the inner wall of the shaped groove 5. Fixing members 8 are installed on both ends of the protective cover plate 7. The fixing members 8 are engaged with the shaped groove 5 to complete the initial fixation of the protective cover plate 7. The shaped groove 5 is filled with sealant 9. The sealant 9 embeds the side of the protective cover plate 7 and the fixing members 8 in the shaped groove 5, thus completing the final fixation of the protective cover plate 7. The connection gap 2 between the protective cover plate 7 and the dam panel 1 is embedded in the shaped groove 5. The installation gap is completely sealed by the sealant 9, which solves the technical problem of water seepage from the connection in the prior art. Moreover, this technical solution does not require drilling holes in the concrete panel 1 with expansion bolts, which simplifies the installation structure and steps, does not damage the structure of the panel 1, and avoids the risk of cracks in the dam panel 1.

[0052] In one specific embodiment, the irregular groove 5 is a long strip groove. In a preferred embodiment, the cross-sectional shape of the irregular groove 5 is a rectangular shape. The lower left part of the rectangular shape is provided with an inwardly recessed arc, and the upper right part of the rectangular shape is provided with an inclined surface. The arc can be engaged with the end of the protective cover plate 7 and the fastener 8. The inclined surface can be used to vertically limit the other end of the fastener 8, so that the fastener 8 can be fixed at the bottom of the irregular groove 5, which facilitates the subsequent pouring of the sealant 9.

[0053] In one specific embodiment, the protective cover 7 includes an arc portion that fits with the flexible filler 6 and a snap-fit ​​portion that fits with the irregular groove 5. The shape of the snap-fit ​​portion is adapted to the inner wall of the irregular groove 5 near the joint 2. The snap-fit ​​portion is L-shaped, and its corner is provided with an arc protrusion adapted to the arc recess.

[0054] In a specific embodiment, referring to Figure 3 , the fixing member 8 is in the shape of a "tu" character structure, including a first cross bar 801, a second cross bar 802 and a vertical bar 803. The first cross bar 801 and the second cross bar 802 are parallel to each other, and the vertical bar 803 is vertically connected to the middle parts of the first cross bar 801 and the second cross bar 802. The fixing member 8 is press-fitted above the clamping portion, and the first cross bar 801 is installed in the outward convex arc of the clamping portion. Through the above, the first cross bar 801 cooperates with the clamping portion on one side of the protection cover plate 7, and the end of the vertical bar 803 cooperates with the inclined slope of the special-shaped groove 5, so that the side edge of the protection cover plate 7 can be fixed in the special-shaped groove 5.

[0055] In a specific embodiment, the sealing material 9 is selected as epoxy mortar. Epoxy mortar has excellent physical, chemical and mechanical properties, which are specifically as follows:

[0056] Excellent sealing performance: Epoxy mortar has good sealing performance, can effectively prevent the penetration of liquid, and thus enhance the sealing performance of the joint.

[0057] Chemical corrosion resistance: Epoxy mortar performs well in the face of various chemical substances, has high chemical inertness and corrosion resistance, can resist the erosion of corrosive liquids and gases, and prolongs the service life.

[0058] Temperature resistance performance: Epoxy mortar has good high-temperature and low-temperature resistance performance. Some special epoxy mortars can even maintain their performance under extreme temperature conditions, making them suitable for a variety of environments.

[0059] Mechanical strength and wear resistance: Epoxy mortar can become very firm after curing, and has good mechanical strength and wear resistance.

[0060] Adhesion performance: Epoxy mortar has excellent adhesion performance, can firmly adhere to the surfaces of the protection panel 1 and the fixing member 8, and thus ensure effective sealing.

[0061] Anti-aging performance: Epoxy mortar has strong anti-aging performance, can maintain its physical and chemical properties for a long time without being affected by the environment, and thus reduces the frequency of maintenance and replacement of the sealing filler.

[0062] Easy to process and construct: Epoxy mortar can be easily poured into the sealing space in the liquid state, fill the irregular-shaped voids, and the construction is convenient.

[0063] It should be noted that the epoxy mortar is only a preferred implementation mode of the sealing material 9, and does not limit its protection scope. Those skilled in the art can add fillers, thickeners, pigments, etc. to the epoxy mortar according to actual needs to adjust its performance and make it suitable for different application scenarios. Or adaptively replace other fluid filling materials with sealing performance, which all fall within the protection scope of the present invention.

[0064] Embodiment 2

[0065] Different from Embodiment 1, in this embodiment, the cross-sectional shape of the special-shaped groove 5 is rectangular, both sides of the protection cover plate 7 are L-shaped, and no arc protrusion is provided at the corner. The fixing member 8 is a "soil"-shaped structure. During installation, both sides of the protection cover plate 7 are installed in the special-shaped groove 5, so that its bottom fits against the inner wall of the special-shaped groove 5. Then, the fixing member 8 is installed above both sides of the protection cover plate 7, and the sealing material 9 is poured. In this solution, during actual installation, due to the lack of vertical limit on the protection cover plate 7 and the fixing member 8, there may be gaps between both sides of the protection cover plate 7 and the inner wall of the special-shaped groove 5. However, as a sub-optimal implementation mode, it can also solve the technical problem of water leakage from the connection in the prior art.

[0066] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, in any aspect, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the same elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0067] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or equivalently replace some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method of constructing a dam body joint waterstop structure, characterized by, Comprising: S1: When pouring the concrete of the panel, embed the foundation groove molds at the panel joints and on both sides of the joints. S2: Before filling, remove the foundation groove molds to form a foundation groove, where the foundation groove includes a V-shaped groove at the joint and special-shaped grooves on both sides of the joint. S3: After preparing the base glue, apply it to the joint surface in the V-shaped groove with a brush. S4: 15 - 50 minutes after applying the base glue, install a rubber rod on the upper side of the joint in the V-shaped groove, and fill flexible filler above the rubber rod. The lower end of the flexible filler is triangular, and the upper end is an arc surface. S5: Immediately cover with a protective cover plate after filling. The upper part of the protective cover plate fits with the arc surface of the flexible filler, and both ends of the protective cover plate are respectively located in the special-shaped grooves. S6: Ensure that both ends of the protective cover plate fit with the inner wall of the special-shaped groove. Install fixing parts on both ends of the protective cover plate, and fill sealing material in the special-shaped groove. The fixing part is in the shape of a "tu" character structure, including a first cross bar, a second cross bar, and a vertical bar. The first cross bar and the second cross bar are parallel to each other, and the vertical bar is vertically connected to the middle of the first cross bar and the second cross bar. The fixing part is pressed above the clamping part, and the first cross bar is installed in the arc convex of the clamping part.

2. The method for constructing a dam body joint waterstop structure according to claim 1, characterized in that, In the steps S2 and S3, it also includes a step of cleaning the foundation groove, using a wire brush to clean the foundation groove and remove foreign objects in the foundation groove.

3. The method for constructing a dam body joint waterstop structure according to claim 2, characterized in that, If there are honeycombs and pitted surfaces on the inner wall of the foundation groove, use polymer mortar for leveling, and grind the protruding parts. Subsequently, wipe the joint surface with clean water or a wet cloth, and dry it with a blowtorch.

4. The method for constructing a dam joint waterstop structure according to claim 1, characterized in that, The base glue is composed of adhesives of two components A and B, and the weight ratio of its components is 10:1.3 - 10:1.5, and it should be used up within 1 - 2 hours.

5. The method of constructing a dam joint seal structure according to claim 1, wherein The shape of the special-shaped groove is a long strip groove, and its cross-sectional shape is a quasi-rectangle. An arc depression that depresses inward is provided at the lower left part of the quasi-rectangle, and an inclined slope is provided at the upper right part of the quasi-rectangle.

6. The method of constructing a dam joint seal structure according to claim 5, wherein The protective cover plate includes an arc part that fits with the flexible filler and a clamping part that fits with the special-shaped groove. The shape of the clamping part is adapted to the inner wall of the special-shaped groove close to the joint. The shape of the clamping part is L-shaped, and an arc convex adapted to the arc depression is provided at the corner.

7. The method of constructing a dam joint seal structure according to claim 1, wherein The sealing material is selected as epoxy mortar.

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