CN112962536B - Seepage-proofing structure for construction joint of rockfill concrete dam and construction method thereof - Google Patents
Seepage-proofing structure for construction joint of rockfill concrete dam and construction method thereof Download PDFInfo
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- CN112962536B CN112962536B CN202110174550.5A CN202110174550A CN112962536B CN 112962536 B CN112962536 B CN 112962536B CN 202110174550 A CN202110174550 A CN 202110174550A CN 112962536 B CN112962536 B CN 112962536B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B7/00—Barrages or weirs; Layout, construction, methods of, or devices for, making same
- E02B7/02—Fixed barrages
- E02B7/04—Dams across valleys
- E02B7/06—Earth-fill dams; Rock-fill dams
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D4/00—Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16
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- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
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- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/04—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
- E02B3/12—Revetment of banks, dams, watercourses, or the like, e.g. the sea-floor
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
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- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/04—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
- E02B3/12—Revetment of banks, dams, watercourses, or the like, e.g. the sea-floor
- E02B3/128—Coherent linings made on the spot, e.g. cast in situ, extruded on the spot
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/16—Sealings or joints
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Abstract
The invention discloses a construction joint seepage-proofing structure of a rockfill concrete dam and a construction method thereof, wherein the construction joint seepage-proofing structure comprises a plurality of sections of dam bodies, each section of dam body is provided with an upstream covering layer, rockfill concrete layers and a downstream covering layer, the rockfill concrete layers are formed by layered pouring, a construction joint is arranged between two adjacent rockfill concrete layers, a first seepage-proofing component, a second seepage-proofing component and a third seepage-proofing component are sequentially arranged on the construction joint from the upstream covering layer side to the downstream covering layer side, the first seepage-proofing component comprises 2 pre-embedded plates, 2 pressing plates and 1 first water-stopping plate, a sealing ring of the first water-stopping plate is positioned in the construction joint, and connecting parts are respectively arranged on the corresponding pre-embedded plates; the U-shaped part of the second anti-seepage component is positioned in the construction joint, and the extension arm is positioned in the rockfill concrete layer; and the foam rod of the third seepage-proofing component is positioned in the construction joint, and the sealing paste is fixed on the rockfill concrete layer through the cement nails. The invention not only has excellent anti-seepage effect, but also can effectively improve the durability of the anti-seepage assembly.
Description
Technical Field
The invention belongs to the technical field of hydraulic engineering, and particularly relates to a rockfill concrete dam construction joint seepage-proofing structure and a construction method thereof.
Background
The rock-fill concrete is a novel concrete provided by Qinghua university, and is a novel large-volume concrete construction mode developed on the basis of a self-compacting concrete technology. The method comprises the steps of firstly directly putting the rockfill with large particle size into a warehouse to form a rockfill body with a gap, then pouring specially-developed low-hydration-heat low-cost self-compacting concrete from the upper part of the rockfill body, and filling the self-compacting concrete into the gap of the rockfill by means of self-weight by utilizing the high-flow segregation resistance of the self-compacting concrete to form the complete and compact large-volume concrete with higher strength, low hydration-heat and low shrinkage deformation. The rockfill concrete dam adopts the construction mode of stacking the rock blocks in layers and filling the self-compacting concrete in layers, and the layering height is generally controlled to be 1.5-2 m, so that a horizontal construction joint exists. The quality of the construction joint surface combination treatment relates to seepage prevention, stability, durability and the like of the dam after reservoir water storage, and is the key point of dam construction quality control. If the construction joints are improperly treated, the dam body structure is cracked, water leakage and the structural durability are affected, and the structure safety is even endangered by serious people, so that the construction joints are required to be subjected to anti-seepage treatment in the construction scheme of the rockfill concrete dam structure. At present, the anti-seepage measures for the construction joints of the rockfill concrete dam mainly have the following structures: firstly, a waterstop is externally attached to a construction joint, a waterproof coiled material is externally attached, waterproof paint is externally coated, and the like, so that the construction joint is blocked to form a waterstop structure; secondly, laying a putty type water stop strip expanding when meeting water or a water stop strip rubber expanding when meeting water on the construction joint, and expanding the water stop strip to block the construction joint by injecting water; thirdly, a middle-buried water stop belt (steel plate or rubber) or an embedded grouting pipe is adopted in a construction joint, normally, when water leakage occurs in the construction joint, direct grouting is carried out through the embedded grouting pipe, the embedded grouting pipe refers to the grouting pipe obliquely pointing to the construction joint and is embedded on two sides of the construction joint, and during waterproof operation, grouting materials are injected into the construction joint through the grouting pipe, so that the grouting materials spread at the construction joint and are fully and effectively fused with concrete to form a water stop structure. In the seepage-proofing structure, the first mode belongs to external water proofing, the water leakage-proofing capability of the construction joint is not really improved, the water-proofing effect is general, the construction cost is high, the water-proofing effect of the second mode can play a good role along with the solution of the expansion problem, but the expansion continuity and the effectiveness of the water-stopping strip have certain limits, and the water-proofing effect is not obvious in practical engineering application; although the problem of leakage hidden danger can be relieved to a certain extent through grouting in the third mode, the waterproof effect is improved to a certain extent, the problem is easily caused at the lap joint of the water stop belt on the actual construction site, a leakage channel is formed, the leakage hidden danger is caused, and the grouting material is difficult to ensure that the grouting material is fully and effectively fused with the concrete due to different performances of the grouting material, so that the problem of leakage water of the construction joint is difficult to be thoroughly and effectively treated, even the grouting is not in place, and the concrete structure can be damaged to a certain extent. Therefore, it is objective to develop an anti-seepage structure for a construction joint of a rock-fill concrete dam and a construction method thereof, wherein the anti-seepage structure has a novel structure, a simple construction method, easy implementation, an excellent anti-seepage effect and good durability.
Disclosure of Invention
In order to solve the problems in the background art, the invention aims to provide an impermeable structure of a construction joint of a rock-fill concrete dam and a construction method thereof, wherein the impermeable structure is novel in structure, simple in construction method, easy to implement, excellent in impermeable effect and good in durability.
The invention relates to a construction joint seepage-proofing structure of a rockfill concrete dam, which comprises a plurality of sections of dam bodies, wherein each section of dam body is sequentially provided with an upstream covering layer, a rockfill concrete layer and a downstream covering layer from the water-facing side to the water-backing side, the rockfill concrete layer is formed by layered pouring of rockfill and self-compacting concrete from bottom to top, a construction joint is arranged between two adjacent rockfill concrete layers, a first seepage-proofing component, a second seepage-proofing component and a third seepage-proofing component are sequentially arranged on the construction joint from the upstream covering layer side to the downstream covering layer side,
the first anti-seepage assembly comprises 2 pre-embedded plates, 2 pressing plates and 1 first water stop plate, wherein one pre-embedded plate is positioned in a lower rockfill concrete layer, the other pre-embedded plate is positioned in an upper rockfill concrete layer, each pre-embedded plate is provided with a bolt seat, a waterproof layer is arranged on the rockfill concrete layer close to one side of an upstream covering layer, two pressing plates corresponding to the pre-embedded plates are arranged on the waterproof layer, adjusting plates are movably arranged on the surfaces of the two pressing plates, threaded holes are machined in the end parts of each pressing plate, adjusting studs are arranged in the threaded holes, one ends of the adjusting studs are arranged in the corresponding bolt seats, the other ends of the adjusting studs are fixedly connected with the pressing plates through nuts, each first water stop plate comprises a sealing ring and connecting parts arranged on the two sides of the sealing ring, the sealing ring is positioned in a construction joint, and the connecting parts are respectively arranged on the corresponding pre-embedded plates;
the second anti-seepage assembly comprises a U-shaped part and two extension arms arranged on two sides of the U-shaped part, the end parts of the extension arms are arranged in bending sections, an opening between the two bending sections is gradually reduced from the upstream covering layer side to the downstream covering layer side, the U-shaped part is positioned in a construction joint, a plurality of chloroprene rubber rods are arranged in a U-shaped cavity of the U-shaped part, one extension arm is positioned in the lower rockfill concrete layer, and the other extension arm is positioned in the upper rockfill concrete layer;
the third seepage-proofing component comprises a foam rod and sealing paste, the foam rod is arranged in a construction joint close to one side of the downstream covering layer, the sealing paste is arranged in the downstream covering layer outside the rockfill concrete layer, and the sealing paste is fixed on the rockfill concrete layer through a cement nail;
and inner sealing plates are filled in construction joints between the foam rod and the U-shaped part, between the U-shaped part and the sealing ring and between the sealing ring and the waterproof layer.
Further, the U-shaped portion, the two extension arms and the bending portion of the second anti-seepage assembly are integrally processed and manufactured, the U-shaped portion, the two extension arms and the bending portion are integrally processed and manufactured by copper materials, and a plurality of reinforcing strips are arranged on the extension arms.
Furthermore, the sealing ring and the connecting part of the first water stop plate are integrally processed and manufactured by elastic materials.
Further, the sealing plate is a polystyrene foam or an asphalt wood wool plate.
Further, the waterproof layer includes 2 waterproof coating layers at least, is provided with 1 intermediate level between the adjacent 2 waterproof coating layers. Preferably, the intermediate layer is at least one of non-woven fabric, mesh fabric, polyester fabric, steel wire mesh or cylinder mesh; preferably, the waterproof coating layer is prepared by coating waterproof coating, and the waterproof coating comprises the following raw materials in parts by weight: 50-70 parts of silicone rubber emulsion, 10-25 parts of graphene nanosheets, 3-8 parts of acrylic acid, 1-5 parts of urea, 10-20 parts of nano titanium dioxide, 0.1-0.5 part of thickening agent and 0.1-0.5 part of preservative.
The invention relates to a construction method of an anti-seepage structure of a construction joint of a rockfill concrete dam, which comprises the following steps:
preparation: selecting a proper template according to the structure of the dam body, erecting the template, and then removing the dam foundation cushion layer for cleaning and tightening, thereby facilitating pouring;
and (2) mounting an anti-seepage assembly: assembling the adjusting stud, the corresponding bolt seat and the embedded plate to form two groups of embedded plate assemblies, assembling the first water stop plate and one group of embedded plate assemblies, then piling a lower rockfill layer between the templates, installing the first water stop plate and the second anti-seepage assembly at corresponding positions of the construction joint after rockfill of the lower rockfill layer enters a warehouse, and protecting and fixing the first water stop plate and the second anti-seepage assembly;
thirdly, pouring of the lower rockfill concrete layer: pouring the self-compacting concrete into a lower rockfill layer at the lower part of the construction joint to form a lower rockfill concrete layer, and enabling one ends of the first water stop plate and the first anti-seepage assembly to be located in the lower rockfill concrete layer and the other ends of the first water stop plate and the first anti-seepage assembly to extend out of the lower rockfill concrete layer;
installing a third seepage prevention component: after the construction joint is cured to be qualified, installing a foam rod at a proper position of the construction joint;
fifthly, pouring the lower rockfill concrete layer: cleaning dirt on the surface of a construction joint, then piling an upper rockfill layer above the construction joint, assembling another group of embedded plate assemblies and a first water stop plate in the process of putting the rockfill into a warehouse, then pouring self-compacting concrete into the upper rockfill layer at the upper part of the construction joint to form an upper rockfill concrete layer, and enabling the other ends of the first water stop plate and the second anti-seepage assembly to be located in the upper rockfill concrete layer;
pouring an upstream covering layer and a downstream covering layer: after the upper rockfill concrete layer is cured to be qualified, a waterproof layer is installed at a construction joint on one side of the upstream covering layer, after the waterproof layer is installed, the pressing plates and the adjusting studs are installed, then the adjusting plate is installed between the two pressing plates, then sealing paste is installed at the construction joint on one side of the downstream covering layer, after the sealing paste is installed, normal concrete is poured on the water facing side and the water backing side of the rockfill concrete layer to form the upstream covering layer and the downstream covering layer.
The invention has the following beneficial effects: firstly, a waterproof layer is arranged between the upstream covering layer and the rockfill concrete layer, the waterproof layer can resist the impact of osmotic water pressure, the waterproof layer is not easy to fall off, and the construction is easy and convenient; the first anti-seepage structure provided by the invention has waterproof and pressure-resistant functions, the sealing ring of the first water stop plate is arranged in the construction joint, a better waterproof effect can be achieved, and meanwhile, the two ends of the first water stop plate are fixedly connected through the embedded plate, the pressing plate and the adjusting stud, so that the stability of the first water stop plate is improved, the bearing capacity of the first water stop plate is enhanced, and the pressure resistance of the first water stop plate is stronger; the end part of the second anti-seepage component is provided with a certain bending angle, so that the self-compacting concrete can easily flow along the bending section and fill the compact rockfill layer, the waterproof effect is obvious on the premise of ensuring the structure of the rockfill concrete layer, the water leakage and water seepage of construction joints can be ensured, and the durability of the construction joints can be further improved; fourthly, the waterproof effect of the construction joint can be further improved by the arranged foam rod and the sealing paste. In conclusion, the multiple anti-seepage assemblies are arranged between the upper layer and the lower layer of adjacent concrete layers at any time, so that the water seepage between the rock-fill concrete layers can be effectively prevented, the influence of the water seepage of construction joints on the durability and the engineering quality of a dam body is avoided, and the dam has an excellent waterproof effect.
Drawings
FIG. 1 is a schematic view of the arrangement structure of a construction joint 3 in a dam body according to the present invention;
FIG. 2 is a schematic view of the arrangement of the barrier structure;
in the figure: 1-upstream covering layer, 2-rockfill concrete layer, 3-downstream covering layer, 4-construction joint, 5-embedded plate, 6-pressing plate, 7-first water stop plate, 8-bolt seat, 9-waterproof layer, 10-adjusting plate, 11-adjusting stud, 12-U-shaped part, 13-extending part, 14-chloroprene rubber rod, 15-foam rod, 16-sealing paste and 17-sealing plate.
Detailed Description
The invention is further illustrated by the following description of embodiments and the accompanying drawings, without in any way limiting the invention, and any alterations or substitutions made on the basis of the teachings of the invention shall fall within the scope of protection of the invention.
As shown in fig. 1-2, the construction joint seepage-proofing structure of the rockfill concrete dam comprises a plurality of sections of dam bodies, wherein the dam bodies are reasonably arranged according to the positions of dam foundations and the length of a dam axis, each section of dam body is sequentially provided with an upstream covering layer 1, a rockfill concrete layer 2 and a downstream covering layer 3 from a water facing side to a water backing side, the rockfill concrete layer 2 is formed by layered pouring of rockfill and self-compacting concrete from bottom to top, a construction joint 4 is arranged between two adjacent upper and lower rockfill concrete layers 2, and a first seepage-proofing component, a second seepage-proofing component and a third seepage-proofing component are sequentially arranged on the construction joint 4 from the upstream covering layer 1 side to the downstream covering layer 3 side.
The first anti-seepage assembly comprises 2 embedded plates 5, 2 pressing plates 6 and 1 first water stop plate 7, the embedded plates 5 and the water stop plates 6 are preferably made of waterproof materials, one embedded plate 5 is positioned in a lower rockfill concrete layer 21, the other embedded plate 5 is positioned in an upper rockfill concrete layer 22, each embedded plate 5 is provided with a bolt seat 8, a waterproof layer 9 is arranged on the rockfill concrete layer 2 close to one side of an upstream covering layer 1, the waterproof layer 9 can resist the impact of osmotic water pressure, the waterproof layer 9 is not easy to fall off, the construction is easy and convenient, two pressing plates 6 corresponding to the embedded plates 5 are arranged on the waterproof layer 9, adjusting plates 10 are movably arranged on the surfaces of the two pressing plates 6, threaded holes are machined at the end parts of each pressing plate 6, adjusting studs 11 are arranged in the threaded holes, one ends of the adjusting studs 11 are arranged in the corresponding bolt seats 8, the other end passes through the nut to be connected fixedly with clamp plate 6, first stagnant water board 7 includes the sealing washer and installs the connecting portion in the sealing washer both sides, the sealing washer is located construction seam 4, connecting portion install respectively on corresponding built-in panel 5, and first seepage prevention structure has had waterproof and resistance to compression's effect concurrently, and during construction seam 4 was arranged in to the sealing washer of first stagnant water board 7, better water-proof effects can be played, and simultaneously the both ends of first stagnant water board 7 are passed through built-in panel 5, clamp plate 6, regulation double-screw bolt 11 and are connected fixedly, are favorable to improving the steadiness of first stagnant water board 7, make the holding capacity reinforcing of first stagnant water board 7 to make the compressive resistance of first stagnant water board 7 stronger, thereby make
Second prevention of seepage subassembly includes U type portion 12 and installs two extension arms 13 at U type portion 12 both sides, the bending section is arranged in to the tip of extension arm 13, and opening between two bending sections reduces from upper reaches overburden 1 side to lower reaches overburden 3 side gradually, U type portion 12 is located construction seam 4, install many chloroprene rubber stick 14 in the U die cavity of U type portion 12, and one of them extension arm 13 is arranged in lower floor's rockfill concrete layer 21, and another extension arm is arranged in upper strata rockfill concrete layer 22, and the tip of second prevention of seepage subassembly has certain angle of buckling, can make self-compacting concrete flow and fill closely-packed heap along the bending section very easily, under guaranteeing rockfill concrete layer structure prerequisite, its waterproof effect is also more showing, can ensure that construction seam 4 is watertight, the infiltration of water proof, further improve its durability.
The third seepage-proofing component comprises a foam rod 15 and sealing paste 16, the foam rod 15 is installed in the construction joint 4 close to one side of the downstream covering layer 3, the sealing paste 16 is arranged in the downstream covering layer 3 on the outer side of the rockfill concrete layer 2, the sealing paste 16 is fixed on the rockfill concrete layer 2 through cement nails, and the arranged foam rod 15 and the sealing paste 16 can further improve the waterproof effect of the construction joint; the construction joints 4 between the foam rods 15 and the U-shaped part 12, between the U-shaped part 12 and the sealing rings, and between the sealing rings and the waterproof layer 9 are all filled with inner sealing plates 17, and after the sealing plates 17 are filled, the construction joints 4 can be completely sealed, so that no gap is formed inside the construction joints.
The anti-seepage structure has the following water stopping process, in the using process of the dam, the waterproof layer 9 with good impact resistance plays a waterproof role, the anti-seepage structure is a first anti-seepage structure, meanwhile, the waterproof layer 9 has strong impact resistance, the durability of the first water stop plate 7 and the second anti-seepage component is favorably improved, when water pressure breaks through the waterproof layer 9, the first water stop plate 7 is mainly used for preventing water, the anti-seepage structure is a second anti-seepage structure, the first water stop plate 7 is arranged on the embedded plate 5, the anti-compression performance is strong, the water stopping effect is good, when the first water stop plate 7 is damaged, the second anti-seepage component forms a third water stopping structure, the chloroprene rubber rod 14 in the U-shaped part 12 can realize multiple waterproof, the water stopping performance of the U-shaped part 12 can be further improved while the service life of the U-shaped part 12 is protected, the foam rod 15 and the sealing paste 16 can form a fourth waterproof structure, thereby realizing multiple water stopping effects.
In order to further improve the water stopping effect of the second impermeable component, preferably, the U-shaped part 12, the two extension arms 13 and the bent part of the second impermeable component are integrally processed and manufactured, the U-shaped part 12, the two extension arms 13 and the bent part are integrally processed and manufactured by using a copper material, and the extension arm 13 is provided with a plurality of reinforcing strips; the sealing ring and the connecting part of the first water stop plate 7 are integrally processed and manufactured by elastic materials.
Furthermore, the sealing plate 17 is a polystyrene foam or asphalt wood wool plate, and the compactness of the polystyrene foam or asphalt wood wool plate is better, so that the filling requirement of the construction joint 4 can be met.
In order to improve the convenience of construction, the waterproof layer 9 at least comprises 2 waterproof coating layers, and 1 interlayer is arranged between every two adjacent 2 waterproof coating layers. Form waterproof layer 9 through intermediate level and waterproof coating layer, let waterproof layer 9 and rock-fill concrete layer 2 zonulae occludens, have good elasticity, adaptable construction joint 4's change, the intermediate level plays the reinforcement effect to waterproof layer 9 simultaneously, improves the intensity of waterproof layer 9, prevents to take place to deform under hydraulic effect when the stagnant water. Preferably, the intermediate layer is at least one of non-woven fabric, mesh fabric, polyester fabric, steel wire mesh or cylinder mesh.
Preferably, the waterproof coating layer is prepared by coating waterproof coating, and the waterproof coating comprises the following raw materials in parts by weight: 50-70 parts of silicone rubber emulsion, 10-25 parts of graphene nanosheets, 3-8 parts of acrylic acid, 1-5 parts of urea, 10-20 parts of nano titanium dioxide, 0.1-0.5 part of thickening agent and 0.1-0.5 part of preservative, wherein in the waterproof coating, the graphene nanosheets are formed by stacking single-layer carbon atom planar structure graphene, the thickness of the two-dimensional graphite nanomaterial is nanoscale, the graphene nanosheets are single-layer graphene in extreme cases, and the graphene nanosheets have nanometer thicknesses and are easy to be uniformly compounded with other materials to form a good compound interface; compared with the common titanium dioxide, the nano titanium dioxide has a finer particle size, the general diameter is less than 100 nanometers, the nano titanium dioxide has aging resistance, and the combination of the nano titanium dioxide and the graphene nanosheets is nanoscale combination, so that the nano titanium dioxide can be better dispersed in the interlayer structure of the graphene nanosheets and is dispersed more deeply, the nano titanium dioxide can not only play an anti-aging role, and the silicone rubber emulsion is used as the most main base material and has a cross-linked network structure; the graphene nanosheet containing the nano titanium dioxide is taken as a layered structure and can be wound in a cross-linked network structure under the action of a covalent bond when being fully dispersed in the silicone rubber emulsion, so that the graphene nanosheet containing the nano titanium dioxide can improve the tensile strength and the elongation at break of the whole silicone rubber emulsion waterproof coating, the anti-aging effect of the silicone rubber emulsion waterproof coating can be improved after acrylic acid and urea are added, and the thickening agent has the effect of increasing the consistency of a product and preventing the components of the product from precipitating. The preservative acts to prevent spoilage of the product.
The invention relates to a construction method of an anti-seepage structure of a construction joint of a rockfill concrete dam, which comprises the following steps:
preparation: selecting a proper template according to the structure of the dam body, erecting the template, and then removing the dam foundation cushion layer for cleaning and tightening, thereby facilitating pouring;
installing an anti-seepage component: assembling an adjusting stud 11, a corresponding bolt seat 8 and an embedded plate 5 to form two groups of embedded plate assemblies, assembling a first water stop plate 7 and one group of embedded plate assemblies, then piling a lower rock-fill layer between templates, installing a first water stop plate 7 and a second anti-seepage assembly at corresponding positions of a construction joint 4 after rock-fill of the lower rock-fill layer enters a warehouse, and protecting and fixing the first water stop plate 7 and the second anti-seepage assembly;
pouring of the lower rockfill concrete layer 21: pouring the self-compacting concrete into a lower rockfill layer at the lower part of the construction joint 4 to form a lower rockfill concrete layer 21, and enabling one ends of the first water stop plate 7 and the first anti-seepage assembly to be located in the lower rockfill concrete layer 21 and the other ends to extend out of the lower rockfill concrete layer 21;
installing a third seepage prevention component: after the construction joint 4 is cured to be qualified, installing a foam rod 15 at a proper position of the construction joint 4;
fifthly, pouring the lower rockfill concrete layer 2: cleaning dirt on the surface of the construction joint 4, then stacking an upper rockfill layer above the construction joint 4, assembling another group of embedded plate assemblies and a first water stop plate 7 in the process of putting the rockfill into a warehouse, then pouring self-compacting concrete into the upper rockfill layer at the upper part of the construction joint 4 to form an upper rockfill concrete layer 22, and enabling the other ends of the first water stop plate 7 and a second anti-seepage assembly to be located in the upper rockfill concrete layer 22;
pouring the upstream covering layer 1 and the downstream covering layer 3: after the upper rockfill concrete layer 22 is cured to be qualified, a waterproof layer 9 is installed at a construction joint 4 located on one side of the upstream covering layer 1, after the waterproof layer 9 is installed, the pressing plates 6 and the adjusting studs 11 are installed, then the adjusting plate 10 is installed between the two pressing plates 6, then sealing paste 16 is installed at the construction joint 4 located on one side of the downstream covering layer 3, after the sealing paste 16 is installed, normal concrete is poured on the water facing side and the water backing side of the rockfill concrete layer 2, and the upstream covering layer 1 and the downstream covering layer 3 are formed.
Claims (7)
1. The utility model provides a rockfill concrete dam construction joint seepage prevention structure, includes the multistage dam body, and every section dam body has set gradually upper reaches overburden (1), rockfill concrete layer (2) and low reaches overburden (3) from the upstream side to the back of the body water face side, its characterized in that: the rockfill concrete layers (2) are formed by layered pouring of rockfill and self-compacting concrete from bottom to top, a construction joint (4) is arranged between two adjacent rockfill concrete layers (2) up and down, a first anti-seepage component, a second anti-seepage component and a third anti-seepage component are sequentially arranged on the construction joint (4) from the upstream covering layer (1) side to the downstream covering layer (3) side,
the first anti-seepage assembly comprises 2 embedded plates (5), 2 pressing plates (6) and 1 first water stop plate (7), wherein one embedded plate (5) is positioned in a lower rockfill concrete layer (21), the other embedded plate (5) is positioned in an upper rockfill concrete layer (22), each embedded plate (5) is provided with a bolt seat (8), a waterproof layer (9) is arranged on the rockfill concrete layer (2) close to one side of an upstream covering layer (1), two pressing plates (6) corresponding to the embedded plates (5) are arranged on the waterproof layer (9), an adjusting plate (10) is movably arranged on the surface of each pressing plate (6), a threaded hole is machined at the end part of each pressing plate (6), an adjusting stud (11) is arranged in each threaded hole, one end of each adjusting stud (11) is arranged in the corresponding bolt seat (8), and the other end of each adjusting stud (11) is fixedly connected with the pressing plate (6) through a nut, the first water stop plate (7) comprises a sealing ring and connecting parts arranged on two sides of the sealing ring, the sealing ring is positioned in the construction joint (4), and the connecting parts are respectively arranged on the corresponding embedded plates (5);
the second anti-seepage assembly comprises a U-shaped portion (12) and two extension arms (13) installed on two sides of the U-shaped portion (12), the end portions of the extension arms (13) are arranged in bending sections, an opening between the two bending sections is gradually reduced from the upstream covering layer (1) side to the downstream covering layer (3) side, the U-shaped portion (12) is located in a construction joint (4), a plurality of chloroprene rubber rods (14) are installed in a U-shaped cavity of the U-shaped portion (12), one extension arm (13) is located in a lower rockfill concrete layer (21), and the other extension arm is located in an upper rockfill concrete layer (22);
the third seepage-proofing component comprises a foam rod (15) and sealing paste (16), the foam rod (15) is installed in a construction joint (4) close to one side of the downstream covering layer (3), the sealing paste (16) is arranged in the downstream covering layer (3) on the outer side of the rockfill concrete layer (2), and the sealing paste (16) is fixed on the rockfill concrete layer (2) through cement nails;
inner sealing plates (17) are filled in the construction joints (4) between the foam rod (15) and the U-shaped part (12), between the U-shaped part (12) and the sealing ring, and between the sealing ring and the waterproof layer (9); the waterproof layer (9) at least comprises 2 waterproof coating layers, and 1 middle layer is arranged between every two adjacent 2 waterproof coating layers.
2. The seepage-proofing structure for the construction joint of the rockfill concrete dam as claimed in claim 1, wherein: u type portion (12), two extension arms (13) and the whole processing preparation of kink of second prevention of seepage subassembly form, and U type portion (12), two extension arms (13) and kink adopt the whole processing of copper product material to form, be provided with a plurality of reinforced strips on extension arm (13).
3. The seepage-proofing structure for the construction joint of the rockfill concrete dam as claimed in claim 1, wherein: the sealing ring and the connecting part of the first water stop plate (7) are integrally processed and manufactured by elastic materials.
4. The seepage-proofing structure for the construction joint of the rockfill concrete dam as claimed in claim 1, wherein: the sealing plate (17) is a polystyrene foam or asphalt wood wool plate.
5. The seepage-proofing structure for the construction joint of the rockfill concrete dam as claimed in claim 1, wherein: the middle layer is at least one of non-woven fabric, grid cloth, polyester cloth, a steel wire mesh or a cylinder mesh.
6. The seepage-proofing structure for the construction joint of the rockfill concrete dam as claimed in claim 1, wherein: the waterproof coating layer is prepared by coating waterproof coating, and the waterproof coating comprises the following raw materials in parts by weight: 50-70 parts of silicone rubber emulsion, 10-25 parts of graphene nanosheets, 3-8 parts of acrylic acid, 1-5 parts of urea, 10-20 parts of nano titanium dioxide, 0.1-0.5 part of thickening agent and 0.1-0.5 part of preservative.
7. The construction method of the seepage-proofing structure of the construction joint of the rockfill concrete dam as claimed in claim 1, wherein: the method comprises the following steps:
preparation: selecting a proper template according to the structure of the dam body, erecting the template, and then removing the dam foundation cushion layer for cleaning and tightening, thereby facilitating pouring;
installing an anti-seepage component: assembling an adjusting stud (11) and corresponding bolt seats (8) and embedded plates (5) to form two groups of embedded plate assemblies, assembling a first water stop plate (7) and one group of embedded plate assemblies, then stacking a lower rockfill layer between templates, installing a first water stop plate (7) and a second anti-seepage assembly at corresponding positions of a construction joint (4) after rockfill of the lower rockfill layer enters a warehouse, and protecting and fixing the first water stop plate (7) and the second anti-seepage assembly;
thirdly, pouring of the lower rockfill concrete layer (21): pouring the self-compacting concrete into a lower rockfill layer at the lower part of the construction joint (4) to form a lower rockfill concrete layer (21), and enabling one ends of the first water stop plate (7) and the first anti-seepage component to be located in the lower rockfill concrete layer (21) and the other ends of the first water stop plate and the first anti-seepage component to extend out of the lower rockfill concrete layer (21);
installing a third seepage prevention component: after the construction joint (4) is cured to be qualified, installing a foam rod (15) at a proper position of the construction joint (4);
fifth, pouring of the lower rockfill concrete layer (2): cleaning dirt on the surface of the construction joint (4), then stacking an upper rockfill layer above the construction joint (4), assembling another group of embedded plate assemblies and a first water stop plate (7) in the process of putting the rockfill into a warehouse, then pouring self-compacting concrete into the upper rockfill layer at the upper part of the construction joint (4) to form an upper rockfill concrete layer (22), and enabling the other ends of the first water stop plate (7) and the second anti-seepage assembly to be located in the upper rockfill concrete layer (22);
sixthly, pouring an upstream covering layer (1) and a downstream covering layer (3): after the upper rockfill concrete layer (22) is maintained to be qualified, a waterproof layer (9) is installed at a construction joint (4) on one side of an upstream covering layer (1), after the waterproof layer (9) is installed, pressing plates (6) and adjusting studs (11) are installed, then an adjusting plate (10) is installed between the two pressing plates (6), then sealing paste (16) is installed at the construction joint (4) on one side of a downstream covering layer (3), and after the sealing paste (16) is installed, normal concrete is poured on the upstream side and the downstream side of the rockfill concrete layer (2) to form the upstream covering layer (1) and the downstream covering layer (3).
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| CN202110174550.5A CN112962536B (en) | 2021-02-09 | 2021-02-09 | Seepage-proofing structure for construction joint of rockfill concrete dam and construction method thereof |
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| CN202110174550.5A CN112962536B (en) | 2021-02-09 | 2021-02-09 | Seepage-proofing structure for construction joint of rockfill concrete dam and construction method thereof |
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| JP4966556B2 (en) * | 2006-01-31 | 2012-07-04 | 大成ロテック株式会社 | Water shielding sheet joining method and water shielding sheet joining structure |
| CN103924622A (en) * | 2014-04-16 | 2014-07-16 | 黄河勘测规划设计有限公司 | Parting water-stop design method of concrete cast-in-situ diaphragm wall of deep overburden layer dam foundation |
| CN203795378U (en) * | 2014-04-17 | 2014-08-27 | 黄河勘测规划设计有限公司 | Peripheral joint water stopping structure for concrete face rockfill dam built in deep coating layer |
| CN107217644A (en) * | 2017-06-27 | 2017-09-29 | 杭州国电大坝安全工程有限公司 | Ultra-high concrete panel rock-fill dams joint water stop structure |
| CN108467676A (en) * | 2018-03-27 | 2018-08-31 | 厦门力嘉诚防水工程有限公司 | A kind of graphene silicon rubber waterproof coating |
| CN110593200B (en) * | 2019-08-14 | 2024-03-19 | 中国电建集团贵阳勘测设计研究院有限公司 | Anti-seepage structure for construction joint of rock-fill concrete dam and construction method thereof |
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