A self-compacting concrete dam construction method and a self-compacting concrete dam

Abstract

The present application relates to the civil engineering field, specifically, a kind of self-compacting concrete dam construction method and self-compacting concrete dam.The construction method of the present application includes according to the zoning requirement of self-compacting concrete dam body structure, first rockfill area and second rockfill area are set in the area to be poured;Partition isolation formwork is set between the first rockfill area and the second rockfill area to form first pouring area and second pouring area independent of each other;Different grade self-compacting concrete is poured into the first pouring area and the second pouring area respectively, so that the first pouring area and the second pouring area are formed synchronously;During the concrete curing process, the partition isolation formwork swells, softens and melts under the action of humid environment, and forms a cementing medium for improving the bonding surface of the first pouring area and the second pouring area.The present application integrates the three processes of pouring, form removal and bonding surface treatment, which are originally independent and conflicting, into a continuous and mutually beneficial whole, improving construction efficiency and forming quality.

Description

Technical Field

[0001] This invention relates to the field of civil engineering technology, and more specifically, to a construction method for a self-compacting concrete dam and a self-compacting concrete dam. Background Technology

[0002] Self-compacting concrete dams typically refer to rockfill concrete dams. During construction, large blocks of stone are first piled up in a storage chamber to form a framework, and then high self-compacting concrete is poured in. The grout's own weight fully fills the voids in the rockfill, forming a monolithic dam body without the need for vibration or compaction. This type of dam uses less cementitious material, has less heat of hydration, and is easier to control in terms of temperature. It can utilize excavated stone materials on-site, and the construction process involves thicker layers and is simpler, making it suitable for small to medium-sized gravity dams and arch dams in mountainous areas with limited transportation.

[0003] Because the functional and performance requirements of different parts of the dam body are significantly different, it is best to carry out sectional casting. However, no construction scheme for self-compacting concrete dam body using sectional casting has been found so far. Summary of the Invention

[0004] This invention provides a construction method for a self-compacting concrete dam and a self-compacting concrete dam, designed according to the functional and performance requirements of different parts of the dam body.

[0005] In a first aspect, the present invention provides a method for constructing a self-compacting concrete dam, comprising: According to the structural zoning requirements of self-compacting concrete dams, a first rockfill zone and a second rockfill zone are set up in the area to be poured. A partition isolation template is set between the first and second quarry areas to form an independent first and second pouring area; Different grades of self-compacting concrete are poured into the first pouring area and the second pouring area respectively, so that the first pouring area and the second pouring area are formed simultaneously; During the concrete curing process, the partition isolation template swells, softens, and melts under the influence of a humid environment, forming a cementitious medium to improve the bonding surface between the first and second pouring areas.

[0006] Preferably, before setting the partition isolation template, the lower part of the dam structure that has been poured is subjected to structural surface treatment so that the exposed height of some rockfill areas meets the roughness requirements of the interface between the upper and lower concrete layers.

[0007] Preferably, the joints between adjacent partition isolation templates are filled with water-swellable sealant or formed into a continuous panel by hot-melt welding to prevent leakage of the grout.

[0008] Preferably, the partition isolation template is cut from a polyvinyl alcohol modified sheet with a high degree of alcoholysis and is installed in an irregular shape according to the partition location of the dam body.

[0009] Preferably, before pouring self-compacting concrete, surface reinforcement is installed on the upstream and downstream faces of the dam body, and an outer steel formwork is installed on the outside of the surface reinforcement.

[0010] Preferably, during the pouring process, high-grade self-compacting concrete is pumped to the second pouring area and low-grade self-compacting concrete is pumped to the first pouring area.

[0011] Preferably, before setting the partition isolation template, the method further includes: Excavation of the dam foundation was carried out, down to the foundation design elevation; After excavation, a normal concrete foundation is poured, and the normal concrete foundation is roughened.

[0012] Preferably, the dam body is tested by core drilling to verify the wetting and filling effect of the cementitious medium formed after the partition isolation template melts in water on the concrete bonding surface, as well as the density of the cementitious layer after curing.

[0013] In a second aspect, the present invention provides a self-compacting concrete dam, formed by any one of the construction methods described above, comprising a self-compacting concrete zone, wherein the self-compacting concrete zone includes: The system comprises a first quarry area, a second quarry area, and a partition isolation template. The first quarry area is used for pouring low-grade self-compacting concrete, and the second quarry area is used for pouring high-grade self-compacting concrete. The partition isolation template is located between the first quarry area and the second quarry area to isolate the two areas in a dry state. In a wet state, the partition isolation template melts to form a high-bonding-strength water-based gel.

[0014] Preferably, the partition isolation template is fitted onto the surface of the first riprap area facing the second riprap area; The second rockfill area is located upstream and downstream of the first rockfill area; an anti-seepage zone is provided outside the second rockfill area; The outer side of the seepage-proof zone is sequentially provided with surface steel reinforcement and outer steel formwork; The self-compacting concrete dam also includes a conventional concrete foundation and a dam crest structure.

[0015] The beneficial effects of the self-compacting concrete dam construction method of the present invention are as follows: A first and second rockfill zone are set up according to structural zoning requirements, and a partition template is set between them to form an independent first and second pouring zone. This measure allows concrete of different performance grades to have their own closed filling space within the same construction surface, thus laying the structural foundation for the synchronous pouring of concrete of different grades. Based on this, different grades of self-compacting concrete are poured into each pouring zone and allowed to form synchronously, thereby achieving zonal pouring according to the functional and performance requirements of different parts of the dam.

[0016] Meanwhile, the partition formwork is not manually removed after the isolation pouring is completed. Instead, it undergoes a gradual process of swelling, softening, and melting under the moist environment of concrete curing, ultimately forming a cementitious medium. This avoids the extra steps of manually removing the partition formwork (formwork removal) and treating the bonding surface, thus improving construction efficiency. More importantly, this cementitious medium can actively penetrate and saturate the bonding surface between the first and second pouring zones, filling the micropores and gaps at the interface. After solidification, it forms a dense, reinforced cement layer, significantly improving the integrity, density, and impermeability of the bonding surface.

[0017] As can be seen, this invention integrates the three processes of pouring, demolding, and joint surface treatment into a continuous and mutually beneficial whole by dividing the template into partitions and isolating it as a rigid isolator for synchronous pouring in the early stage and transforming it into an interface strengthening medium for self-strengthening of the interface without demolding in the later stage. This improves construction efficiency and forming quality. Attached Figure Description

[0018] Figure 1 This is a structural schematic diagram of the self-compacting concrete dam involved in the present invention; Figure 2 for Figure 1 The diagram shows the structure during the casting process.

[0019] Explanation of reference numerals in the attached figures: 1. Dam foundation; 2. Self-compacting concrete dam body; 3. Self-compacting concrete zone; 4. Seepage prevention zone; 5. Normal concrete foundation; 6. Dam crest structure; 7. Lower dam structure already poured; 8. Upper and lower layer interface; 9. First rockfill zone; 10. Zone isolation formwork; 11. Second rockfill zone; 12. Upstream face; 13. Downstream face; 14. Surface reinforcement; 15. Outer steel formwork; 16. Low-grade self-compacting concrete; 17. High-grade self-compacting concrete; 18. Pouring design elevation. Detailed Implementation

[0020] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Although some embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the accompanying drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0021] Where terminology is involved, the term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; and the term "optionally" means "optional embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first," "second," etc., mentioned in this invention are used only to distinguish different devices, modules, or units, and are not intended to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0022] It should be noted that the terms "a" and "a plurality of" used in this invention are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0023] Example 1 This embodiment provides a construction method for self-compacting concrete dams. For example... Figure 1 and Figure 2 As shown, the construction method includes the following steps: First, according to the structural zoning requirements of the self-compacting concrete dam body 2, a first rockfill zone 9 and a second rockfill zone 11 are set up within the area to be poured. The "structural zoning requirements of the self-compacting concrete dam body 2" mentioned here refer to the design specifications for dividing the internal concrete performance grades of the dam body into zones according to the stress, seepage prevention and other functional requirements of different parts of the dam body. For example, the dam body is divided into an internal low-grade concrete zone and an external high-grade seepage prevention concrete zone.

[0024] Then, a partition template 10 is installed between the first riprap area 9 and the second riprap area 11 to form independent first and second pouring areas. The partition template 10 is a plate-shaped component used to establish temporary isolation boundaries within the riprap body or between different riprap areas. When the partition template 10 is installed between the first riprap area 9 and the second riprap area 11, the space on one side is defined as the first pouring area, and the space on the other side is defined as the second pouring area. The two pouring areas are completely separated in space by the template, so that concrete of different performance grades will not mix during subsequent pouring.

[0025] Different grades of self-compacting concrete are poured into the first and second pouring zones respectively, so that the first and second pouring zones are formed simultaneously. "Different grades of self-compacting concrete" refers to self-compacting concrete with different strength grades or different performance indicators. By pouring separately, it is ensured that each zone obtains the type of concrete that meets the design requirements; by forming simultaneously, the concrete in different zones is poured within the same construction cycle, avoiding construction cold joints caused by multiple pours.

[0026] During the curing process after concrete pouring, the partition isolation formwork 10 swells, softens, and melts under the influence of a humid environment, forming a cementitious medium to improve the interface between the first and second pouring zones. The humid environment refers to the moist conditions encountered during concrete curing, such as the moisture created by water spraying or the internal moisture generated by the release of heat from the concrete's hydration. The partition isolation formwork 10 undergoes a gradual process of swelling, softening, and melting, transforming from a solid slab into a fluid substance. This fluid substance is the cementitious medium, which can penetrate and wet the interface between the first and second pouring zones, filling the micropores and gaps at the interface. "Improving the interface" means that through the wetting and filling effect of the cementitious medium, the density and adhesion of the interface are increased, thereby enhancing the integrity and impermeability of the interface.

[0027] Through the above steps, this method enables the synchronous pouring of self-compacting concrete of different grades in the same construction area. The partition isolation formwork 10, after fulfilling its isolation function, does not require manual removal, avoiding the extra steps of manual removal and manual treatment of the bonding surface, thus improving construction efficiency. Furthermore, the cementitious medium formed by the partition isolation formwork 10 actively strengthens the concrete bonding surface, improving the quality of the bonding surface formation.

[0028] By repeatedly executing Example 1, the entire dam body can be poured segment by segment. Specifically, as follows: Figure 2As shown, the upper and lower layer interface 8 is used as the boundary, extending up to the design pouring elevation 18 as a schematic illustration of a pouring section. In a preferred embodiment, before setting the partition isolation template 10, the lower, already poured dam structure 7 undergoes structural surface treatment to expose part of the rockfill area, thereby improving the shear strength of the upper and lower concrete interface. Here, "the lower, already poured dam structure 7" refers to the portion of the dam below the current layer to be poured where concrete has been poured and reached a certain strength. "Structural surface treatment" refers to the cleaning and finishing of the top surface of this lower structure, such as using high-pressure water jets, manual chiseling, or mechanical removal to remove laitance and loose aggregate from the concrete surface, resulting in slightly exposed coarse sand. "Exposing part of the rockfill area" means that when pouring high-self-compacting concrete, in addition to reaching the designed top surface of the structure, a suitable amount of boulders should be placed 50mm to 150mm above the pouring surface, and should not exceed 1 / 3 of their own height. This means exposing the upper half of the rockfill embedded in the lower dam structure, for example, exposing 1 / 3 of the boulders' particle size, resulting in a naturally uneven surface. This treatment improves the roughness of the interface between the upper and lower concrete layers, allowing the subsequently poured upper concrete to form good mechanical interlocking and overall stress distribution with the exposed rockfill and rough surface.

[0029] As a preferred embodiment, the sealing treatment method at the joints of the partition isolation templates 10 is further defined. Specifically, the joints between adjacent partition isolation templates 10 are filled with water-swellable sealant, or a continuous plate surface is formed by hot-melt welding to prevent leakage of the poured grout. The "joints between adjacent partition isolation templates 10" refers to the joint areas formed when multiple partition isolation templates 10 are joined together at a plane or corner. "Water-swellable sealant" refers to a sealing material that can be applied or embedded in a dry state and expands in volume upon contact with water, such as modified polyurethane or hydrophilic rubber water-swellable sealing strips or pastes. During construction, the sealant is evenly filled along the joint. When the water contained in the poured concrete grout comes into contact with the sealant, the sealant expands, tightly pressing the edges of the templates on both sides of the joint, thereby achieving the effect of sealing the gaps and preventing grout leakage. By forming a continuous slab surface, physical joints are eliminated, which can effectively prevent the grout from leaking from the formwork joints and ensure that the first and second pouring zones remain independent of each other during the pouring process.

[0030] In a preferred embodiment, the partition isolation template 10 is formed by cutting high-hydrolyzability polyvinyl alcohol modified board and is irregularly positioned and installed according to the partition location of the dam body. The "high-hydrolyzability polyvinyl alcohol modified board" referred to here means a material with polyvinyl alcohol resin as the base material. It should be noted that this material is an existing custom-made material. In a dry state, this material has a certain degree of water resistance and adaptability to deformation; in a humid environment, it can gradually absorb moisture, swell, soften until it completely dissolves, and transforms into a binding gelling medium. In this embodiment, the irregular positioning and installation according to the dam body partition location specifically includes stacking the first rockfill area 9 on the lower dam body structure 7 that has been poured. Then, using the first rockfill area 9 as the positioning and installation base, the cut plates are positioned and temporarily fixed at the boundary of the dam body partition according to the design drawings. For example, support rods, positioning buckles or adhesives are used to accurately define the boundary between the first rockfill area 9 and the second rockfill area 11 by the partition isolation template 10. Finally, the second rockfill area 11 is laid on the partition isolation template 10.

[0031] In a preferred embodiment, the step of pouring different grades of self-compacting concrete into the first pouring area and the second pouring area respectively includes pumping high-grade self-compacting concrete 17 into the second pouring area and low-grade self-compacting concrete 16 into the first pouring area. In practice, the time interval between the sequential pouring can be a few seconds to ensure that the seepage prevention zone 4 meets the design requirements.

[0032] As a preferred embodiment, the steps of reinforcing and setting up formwork on the dam surface before pouring self-compacting concrete are further defined. Specifically, before pouring self-compacting concrete, surface reinforcement 14 is set on the upstream face 12 and the downstream face 13, and a formwork structure is set on the outside of the surface reinforcement 14. The "upstream face of the dam" refers to the surface of the dam on the water-retaining side, and the "downstream face of the dam" refers to the surface of the dam on the back side. The "surface reinforcement 14" refers to the steel mesh or steel skeleton arranged in the concrete layer on the dam surface, used to improve the crack resistance and structural integrity of the surface concrete. During setting, the surface reinforcement 14 is tied and positioned at a certain distance from the designed surface of the dam, for example, 10-15 cm from the designed surface. The "formwork structure" refers to the temporary retaining structure set on the outside of the surface reinforcement 14 to define the boundary of the concrete pouring on the dam surface, such as the outer steel formwork 15. This formwork structure, together with the aforementioned partition isolation formwork 10, constitutes a complete pouring space boundary. The partition isolation formwork 10 is responsible for the isolation between different concrete partitions inside, and the outer formwork structure is responsible for shaping the outer contour of the dam.

[0033] As an optimized implementation, the construction of the dam foundation 1 is further limited to the step of constructing the dam foundation 1 before setting the partition isolation template 10. Specifically, before setting the partition isolation template 10, the dam foundation 1 is excavated to the foundation design elevation; then, a normal concrete foundation 5 is poured on the excavated foundation, and the normal concrete foundation 5 is roughened. The "excavation of the dam foundation 1" referred to here means removing the overburden and weathered rock mass in the dam site area according to the design drawings until the design depth that meets the bearing capacity and seepage resistance requirements is reached, such as... Figure 1 As shown, the location of the dam foundation 1 is indicated by the arrow symbol 1. "Foundation design elevation" refers to the altitude of the bottom surface of the dam foundation 1 as specified in the design documents. "Normal concrete foundation 5" refers to a layer of conventional slump concrete with a certain thickness and strength grade poured on the prepared excavation surface, used to provide a smooth and solid working surface for the superstructure self-compacting concrete dam body 2. "Roughening treatment" refers to the process of chiseling or milling the surface of the normal concrete foundation 5 after its initial setting or hardening, using manual or mechanical tools to create a rough, textured surface. This treatment disrupts the smooth cement paste skin on the concrete surface, exposing the aggregate, thereby increasing the mechanical interlocking force between the foundation layer and the subsequently poured superstructure concrete or rockfill.

[0034] As an optimized implementation method, the steps for quality inspection of the dam body after construction are further defined. Specifically, the cured dam body is inspected by core drilling to verify the wetting and filling effect of the cementitious medium formed by the partition isolation template 10 after melting in water on the concrete interface, as well as the density of the cementitious layer after curing. "Core drilling" refers to a testing method that uses diamond drill bits or other core drilling equipment to drill a cylindrical concrete core sample through the interface between the first and second pouring zones on the cured dam body. The core sample contains the concrete entity at the interface, and the bonding condition of this interface can be directly evaluated through observation and testing. "The wetting and filling effect of the cementitious medium formed by the partition isolation template 10 after melting in water on the concrete interface" refers to the physical state of whether the cementitious medium formed by the conversion of the aforementioned high-hydrolyzed polyvinyl alcohol modified board effectively penetrates into and fills the pores and microcracks of the concrete on both sides of the interface. "The density of the cured cementitious layer" refers to the compactness and strength of the thin cementitious layer formed at the interface after the cementitious medium has cured for a certain period of time. During verification, the core sample can be visually inspected to observe whether the interface is continuous and whether there are visible gaps or separation. A splitting tensile test or a penetration test can also be performed on the core sample to test the mechanical strength and impermeability of the interface. If the fracture surface of the core sample at the interface is not at the interface itself but occurs in the parent concrete, and the penetration test does not reveal any leakage channels along the interface, it indicates that the cementitious medium formed by the partitioned isolation formwork 10 has fully impregnated and filled the interface, and after curing, a dense cementitious layer has been formed, meeting the design requirements for construction quality.

[0035] Example 2 This embodiment provides a self-compacting concrete dam, which is constructed using the construction method described in Embodiment 1. The dam body includes a self-compacting concrete zone 3, which includes a first rockfill zone 9, a second rockfill zone 11, and a partition isolation formwork 10.

[0036] Specifically, the first rockfill area 9 is used to pour low-grade self-compacting concrete 16. "Low-grade self-compacting concrete 16" refers to self-compacting concrete with a relatively low strength grade, such as C15 self-compacting concrete, which mainly fills the voids in the rockfill body of the first rockfill area 9, forming the main load-bearing area inside the dam body. The second rockfill area 11 is used to pour high-grade self-compacting concrete 17. "High-grade self-compacting concrete 17" refers to self-compacting concrete with a higher strength grade or specific performance indicators, such as high-grade self-compacting concrete with seepage prevention requirements, which fills the voids in the rockfill body of the second rockfill area 11, forming the outer area of ​​the dam body with specific functional requirements.

[0037] The partition isolation template 10 is disposed between the first rockfill zone 9 and the second rockfill zone 11. The partition isolation template 10 has a dual function in the dam structure: in its dry state, it isolates the first rockfill zone 9 from the second rockfill zone 11, providing a physical boundary for the simultaneous pouring of low-grade self-compacting concrete 16 and high-grade self-compacting concrete 17, preventing the mixing of concretes of different performance grades during pouring; in its wet state, the partition isolation template 10 melts and forms a high-bonding-strength water-based gel. The "high-bonding-strength water-based gel" refers to a water-based gelling substance with bonding capabilities, formed from a solid plate after the partition isolation template 10 absorbs moisture from the concrete or during curing. This gel can penetrate and fill the micropores at the interface between the first rockfill zone 9 and the second rockfill zone 11, forming a dense cementitious layer at the interface after solidification, improving the integrity and impermeability between the concretes of different grades on both sides.

[0038] In a preferred embodiment, the self-compacting concrete dam structure in this example comprises a second rockfill zone 11 located on both the upstream and downstream sides of the first rockfill zone 9. Here, "upstream side" refers to the water-retaining side of the dam body, and "downstream side" refers to the backwater side of the dam body. By arranging the second rockfill zones 11 on both sides of the first rockfill zone 9, a sandwich-like spatial pattern is formed, with the first rockfill zone 9 inside and the second rockfill zones 11 upstream and downstream outside.

[0039] In a preferred embodiment, a seepage-proof zone 4 is provided on the outer side of the second rockfill zone 11. The "seepage-proof zone 4" refers to an area located near the upstream and downstream faces of the dam body, specifically designed for filling with high-grade self-compacting concrete. During the pouring process, high-grade self-compacting concrete 17 flows from the second rockfill zone 11 into the seepage-proof zone 4, forming a dense outer layer with seepage-resistant properties.

[0040] In a preferred embodiment, surface reinforcement 14 and outer steel formwork 15 are sequentially arranged on the outer side of the seepage prevention zone 4. The surface reinforcement 14 is positioned at the thickness of the protective layer of the concrete layer in the seepage prevention zone 4 to enhance the crack resistance and structural integrity of the dam surface concrete. The outer steel formwork 15 is positioned outside the surface reinforcement 14 to define the outline of the upstream and downstream surfaces of the dam, providing precise forming boundaries for concrete pouring.

[0041] In addition, the self-compacting concrete dam in this embodiment also includes a normal concrete foundation 5 and a dam crest structure 6. The normal concrete foundation 5 is located between the bottom of the dam body and the foundation, providing a flat and solid foundation platform for construction operations in the upper self-compacting concrete zone 3. The dam crest structure 6 is located at the top of the dam body and is used to fulfill the functional requirements of the dam crest structure closure and upper traffic.

[0042] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A construction method for a self-compacting concrete dam, characterized in that, include: According to the structural zoning requirements of the self-compacting concrete dam body (2), the first rockfill area (9) and the second rockfill area (11) are set up in the area to be poured. A partition isolation template (10) is set between the first rockfill area (9) and the second rockfill area (11) to form a first pouring area and a second pouring area that are independent of each other; Different grades of self-compacting concrete are poured into the first pouring area and the second pouring area respectively, so that the first pouring area and the second pouring area are formed simultaneously; During the concrete curing process, the partition isolation template (10) swells, softens and melts under the action of a humid environment, forming a cementitious medium to improve the bonding surface between the first pouring area and the second pouring area.

2. The construction method for self-compacting concrete dams according to claim 1, characterized in that, Before setting the partition isolation template (10), the lower dam structure (7) that has been poured is subjected to structural surface treatment so that the exposed height of some rockfill areas meets the roughness requirements of the interface between the upper and lower concrete layers.

3. The self-compacting concrete zoned casting structure according to claim 1, characterized in that, The joints between adjacent partition isolation templates (10) are filled with water-swellable sealant or formed into a continuous plate surface by hot-melt welding to prevent leakage of the grout.

4. The construction method for self-compacting concrete dams according to claim 1, characterized in that, The partition isolation template (10) is formed by cutting high-hydrolyzed polyvinyl alcohol modified board and is installed in an irregular shape according to the partition position of the dam body.

5. The construction method for self-compacting concrete dams according to claim 1, characterized in that, Before pouring the self-compacting concrete, surface reinforcement (14) is set on the upstream face (12) and downstream face (13) of the dam body, and an outer steel formwork (15) is set on the outside of the surface reinforcement (14).

6. The construction method for self-compacting concrete dams according to claim 1, characterized in that, During the pouring process, high-grade self-compacting concrete (17) is pumped to the second pouring area and low-grade self-compacting concrete (16) is pumped to the first pouring area.

7. The construction method for self-compacting concrete dams according to claim 1, characterized in that, Before setting the partition isolation template (10), the following is also included: Excavation of the dam foundation (1) was carried out, and the excavation was carried out down to the foundation design elevation; After excavation, a normal concrete foundation (5) is poured, and the normal concrete foundation (5) is roughened.

8. The construction method for self-compacting concrete dams according to claim 1, characterized in that, The dam body was tested by core drilling to verify the wetting and filling effect of the cementitious medium formed by the partition isolation template (10) after it melts in water on the concrete bonding surface, as well as the density of the cement layer after curing.

9. A self-compacting concrete dam, characterized in that, Formed by the construction method of any one of claims 1-8, comprising a self-compacting concrete zone (3), said self-compacting concrete zone (3) comprising: The first riprap area (9), the second riprap area (11), and the partition isolation template (10) are provided. The first riprap area (9) is used to pour low-grade self-compacting concrete, and the second riprap area (11) is used to pour high-grade self-compacting concrete (17). The partition isolation template (10) is located between the first riprap area (9) and the second riprap area (11) to isolate the first riprap area (9) and the second riprap area (11) in its dry state. The partition isolation template (10) melts in the wet state to form a high-bonding-strength water-based gel.

10. The self-compacting concrete dam according to claim 9, characterized in that, The partition isolation template (10) is attached to the side surface of the first riprap area (9) facing the second riprap area (11); The second rockfill area (11) is located on the upstream and downstream sides of the first rockfill area (9); an anti-seepage zone (4) is provided on the outer side of the second rockfill area (11). The outer side of the seepage-proof zone (4) is provided with surface steel bars (14) and outer steel formwork (15). The self-compacting concrete dam also includes a normal concrete foundation (5) and a dam crest structure (6).

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