Combined anti-seepage curtain for water conservancy project and construction method of combined anti-seepage curtain

Abstract

The invention discloses a combined anti-seepage curtain for a water conservancy project and a construction method. The combined anti-seepage curtain comprises a dam, a foundation trench formed in the bottom of the dam, an assembly type anti-seepage curtain and a cast-in-place anti-seepage curtain, wherein the assembly type anti-seepage curtain and the cast-in-place anti-seepage curtain are arranged in the foundation trench; the bottom of the assembly type anti-seepage curtain is as wide as the foundation trench; the cast-in-place anti-seepage curtains are arranged on the two sides of the assembly type anti- The assembly type anti-seepage curtain comprises a third anti-seepage curtain, a plurality of second anti-seepage curtains and a first anti-seepage curtain which are sequentially spliced from top to bottom. The outer surfaces of the first anti-seepage curtain, the second anti-seepage curtain and the third anti-seepage curtain are of concave-convex clamping convex structures; waterproof coatings are coated on the outer surfaces of the first anti-seepage curtain, the second anti-seepage curtain and the third anti-seepage curtain; a geomembrane is arranged on the outer surface of the waterproof coating; the assembly type anti-seepage curtain and the cast-in-place anti-seepage curtain are combined, and meanwhile multiple anti-seepage measures are arranged, so that the forming quality and the anti-seepage effect of the anti-seepage curtain are greatly improved.

Description

Technical Field

[0001] The invention belongs to the technical field of water conservancy and hydropower, and more specifically, relates to a combined anti-seepage curtain for water conservancy projects and a construction method thereof. Background Art

[0002] The anti-seepage curtain refers to a facility that continuously blocks seepage by pouring anti-seepage materials into the foundation and slope connected to the water retaining structure, such as concrete anti-seepage wall, cement soil water cutoff wall, sheet pile or grouting curtain, etc. It is a preventive measure for seepage deformation. At present, the anti-seepage curtain has the following problems in actual application: First, the construction process generally uses cast-in-place concrete or mixing piles, which are easily affected by the construction process and the final construction quality is difficult to guarantee; second, the anti-seepage form is single, which is prone to leakage weak points or hidden dangers, threatening the safety of the dam.

[0003] However, the prior art discloses an anti-seepage wall composed of a wall, a connecting rod, a connecting block, a connecting groove, a connecting hole, etc., and the design of the first wall and the second wall achieves the effect of convenient movement and installation of the device, inserting the connecting rod and the connecting block into the connecting hole and the connecting groove, and then installing the screw into the screw hole by turning the screw, so as to achieve the effect of convenient combination of the first wall and the second wall, and at the same time, the design of the filling layer and the waterproof layer achieves the effect of preventing the first wall and the second wall from being cracked by water. However, the technical solution is relatively complicated, and there is great inconvenience in assembly at the actual construction site, and the bolts are not considered to be anti-seepage, which has great application limitations.

[0004] Therefore, there is an urgent need for a combined anti-seepage curtain that can improve the molding quality of the anti-seepage curtain and greatly improve the anti-seepage effect. Summary of the invention

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a combined anti-seepage curtain for water conservancy projects and a construction method thereof, which utilizes waterproof coating, geomembrane, cast-in-place concrete, and prefabricated concrete to form a combined anti-seepage system, which can not only improve the molding quality of the anti-seepage curtain, but also greatly improve the anti-seepage effect of the combined anti-seepage curtain; it can solve the problems that the prior art has great inconveniences during assembly at the construction site, and anti-seepage is not considered at the bolts, which has great application limitations. The current anti-seepage curtain is greatly affected by the construction process and the construction quality is difficult to guarantee. By setting multiple anti-seepage layers to form a combined anti-seepage system, the anti-seepage effect is greatly improved.

[0006] In order to achieve the above-mentioned object, one aspect of the present invention provides a combined anti-seepage curtain for water conservancy projects, comprising a dam, a foundation trench arranged at the bottom of the dam, an assembled anti-seepage curtain and a cast-in-place anti-seepage curtain arranged in the foundation trench; wherein:

[0007] The bottom of the assembled anti-seepage curtain is as wide as the base trench;

[0008] The cast-in-place anti-seepage curtain is arranged on both sides of the assembled anti-seepage curtain;

[0009] The assembled anti-seepage curtain comprises a third anti-seepage curtain, a plurality of second anti-seepage curtains and a first anti-seepage curtain which are sequentially spliced ​​from top to bottom;

[0010] The outer surfaces of the first anti-seepage curtain, the second anti-seepage curtain and the third anti-seepage curtain are concave-convex convex structures, which are used to increase the bite degree between each anti-seepage curtain and the cast-in-place concrete; the outer surfaces of the first anti-seepage curtain, the second anti-seepage curtain and the third anti-seepage curtain are provided with waterproof coating; the outer surface of the waterproof coating is provided with a geomembrane;

[0011] By combining the assembled anti-seepage curtain with the cast-in-place anti-seepage curtain and setting up multiple anti-seepage measures at the same time, the molding quality and anti-seepage effect of the anti-seepage curtain can be greatly improved.

[0012] Furthermore, the top of the third anti-seepage curtain is connected to the bottom of the dam; the third anti-seepage curtain and the second anti-seepage curtain, two adjacent second anti-seepage curtains, and the second anti-seepage curtain and the first anti-seepage curtain are all connected by mortise and tenon joints.

[0013] Further, the bottom of the first anti-seepage curtain is a planar structure;

[0014] The top of the first anti-seepage curtain is provided with a first tenon connected to the bottom of the second anti-seepage curtain;

[0015] Furthermore, the bottom of the second anti-seepage curtain is provided with a first mortise connected to the top of the first anti-seepage curtain;

[0016] The top of the second anti-seepage curtain is provided with a second tenon connected to the bottom of the third anti-seepage curtain or the bottom of the second anti-seepage curtain;

[0017] Furthermore, the bottom of the third anti-seepage curtain is provided with a second mortise connected to the top of the second anti-seepage curtain;

[0018] The top of the third anti-seepage curtain is provided with W-shaped patterns.

[0019] Furthermore, the first tenon and the second tenon are respectively provided with a plurality of first holes;

[0020] The first mortise and the second mortise are respectively provided with a plurality of second holes which are consistent with the first holes on the corresponding tenon in position, quantity and size; by inserting bolts into the first holes and the second holes at corresponding positions, a geomembrane is pasted at the bolt joint.

[0021] Furthermore, the cast-in-place anti-seepage curtain is made of soft stone;

[0022] Further, the waterproof coating is an acrylic waterproof coating;

[0023] Furthermore, the geomembrane is a HDPE film with a thickness of 3 to 5 mm.

[0024] A second aspect of the present invention provides a construction method of a combined anti-seepage curtain for a water conservancy project, which is implemented by using the combined anti-seepage curtain for a water conservancy project, and comprises the following steps:

[0025] S1: Determine the size of the prefabricated anti-seepage curtain required in the embankment project based on the geotechnical properties of the on-site soil and the design anti-seepage requirements;

[0026] S2: The assembled anti-seepage curtain is manufactured in a prefabricated factory according to the size of the curtain, and the mold is removed and maintained after the construction conditions are met; after the assembled anti-seepage curtain reaches the age, the waterproof coating is first applied to the curtain, and then the geomembrane is attached;

[0027] S3: Before construction begins, the site is leveled, the surveyors conduct line measurement, and the supervision unit reviews the line measurement results; and the foundation trench is excavated;

[0028] S4: Use one lifting device to lift the first anti-seepage curtain, and use another lifting device to lift the second anti-seepage curtain and the third anti-seepage curtain in turn, and sink them into the foundation trench while splicing them, and align the tenons and mortises between the first anti-seepage curtain and the second anti-seepage curtain, between two adjacent second anti-seepage curtains, and between the second anti-seepage curtain and the third anti-seepage curtain; insert bolts into the corresponding holes to fix them, and stick a layer of geomembrane at the joints again;

[0029] S5: When the prefabricated anti-seepage curtain reaches the design elevation, the concrete pouring of the cast-in-place anti-seepage curtain is carried out on both sides of the foundation trench; after the cast-in-place anti-seepage curtain reaches the design strength, a joint anti-seepage curtain is formed between the cast-in-place anti-seepage curtain and the prefabricated anti-seepage curtain, and then the subsequent construction of the embankment superstructure is carried out.

[0030] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0031] (1) A combined anti-seepage curtain for water conservancy projects and a construction method thereof of the present invention are provided by providing a foundation trench at the bottom of the dam, and providing an assembled anti-seepage curtain and a cast-in-place anti-seepage curtain in the foundation trench; the bottom of the assembled anti-seepage curtain is the same width as the foundation trench; the cast-in-place anti-seepage curtain is provided on both sides of the assembled anti-seepage curtain; the assembled anti-seepage curtain includes a third anti-seepage curtain, a plurality of second anti-seepage curtains and a first anti-seepage curtain which are sequentially spliced ​​from top to bottom; a concave and convex convex structure is provided on the outer surfaces of the first anti-seepage curtain, the second anti-seepage curtain and the third anti-seepage curtain to increase the bite of each anti-seepage curtain with the cast-in-place concrete; a waterproof coating is applied on the outer surfaces of the first anti-seepage curtain, the second anti-seepage curtain and the third anti-seepage curtain, and a geomembrane is provided on the outer surface of the waterproof coating to enhance the Waterproof performance; the top of the third anti-seepage curtain is provided with a W-shaped pattern, which can enhance the connection and bite effect between the anti-seepage curtain and the upper dam, and improve the integrity of the water conservancy facilities; by combining the prefabricated assembled anti-seepage curtain with the cast-in-place anti-seepage curtain, the molding effect of the anti-seepage curtain is improved, and the construction quality is effectively guaranteed; at the same time, by setting up multiple anti-seepage measures, the anti-seepage effect is greatly improved; the present invention utilizes waterproof coating, geomembrane, cast-in-place concrete, and assembled concrete to form a joint anti-seepage system, which can not only improve the molding quality of the anti-seepage curtain, but also greatly improve the anti-seepage effect of the joint anti-seepage curtain; it can solve the problem that the prior art has great inconvenience in assembly at the construction site, and the bolts do not consider anti-seepage, which has great application limitations.

[0032] (2) The present invention provides a combined anti-seepage curtain for water conservancy projects and a construction method thereof. In terms of the construction method, the present invention provides a detailed construction procedure, including determining the size of the anti-seepage curtain, prefabricating the assembled anti-seepage curtain, leveling the site and excavating the foundation trench, hoisting and splicing the assembled anti-seepage curtain, and pouring concrete for the cast-in-place anti-seepage curtain. These steps ensure the high-quality construction of the anti-seepage curtain, and through the setting of multiple anti-seepage layers, a combined anti-seepage system is formed, thereby greatly improving the anti-seepage effect; by prefabricating the anti-seepage curtain in the factory, quality control in the production process is guaranteed, and at the same time, the size and shape of the prefabricated parts can be more precise, which helps to improve the efficiency and quality of on-site construction; the present invention combines the strength and anti-seepage performance of modern materials with the structural stability and sealing of traditional mortise and tenon connections, providing a reliable anti-seepage solution for water conservancy projects.

[0033] (3) A combined anti-seepage curtain for water conservancy projects and a construction method thereof of the present invention, HDPE geomembrane (high-density polyethylene geomembrane) is attached to the outside of the waterproof coating of the assembled anti-seepage curtain. This is a commonly used waterproof and anti-seepage material with excellent environmental stress cracking resistance, low temperature resistance, aging resistance, corrosion resistance, as well as a large operating temperature range and a long service life; HDPE geomembrane is widely used in water conservancy projects, such as domestic waste landfill anti-seepage, solid waste landfill anti-seepage, sewage treatment plant anti-seepage, etc. The construction method of HDPE geomembrane includes key processes such as laying and welding, and has certain requirements on the construction environment and conditions, which can ensure a good anti-seepage effect; compared with the existing HDPE geomembrane construction technology, the present invention pays more attention to the integrity and continuity of the anti-seepage curtain, and improves the molding quality and anti-seepage effect of the anti-seepage curtain through the combination of assembly and cast-in-place concrete, which is of great significance to the safety and durability of water conservancy projects.

[0034] (4) The present invention provides a combined anti-seepage curtain for water conservancy projects, and the design of the assembled anti-seepage curtain takes into account structural stability, anti-seepage performance and construction convenience. By symmetrically arranging protrusions and slots on both sides of the assembled anti-seepage curtain, tight connection of the structure and effective anti-seepage are achieved. The anti-seepage curtain is prefabricated with high-strength anti-seepage concrete. This high-strength and high-impermeability grade concrete provides the structure with the necessary strength and durability, ensuring the long-term stability of the anti-seepage curtain in water conservancy projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic structural diagram of a combined anti-seepage curtain for a water conservancy project according to an embodiment of the present invention;

[0036] Figure 2 This is a schematic structural diagram of a first anti-seepage curtain of a combined anti-seepage curtain for a water conservancy project according to an embodiment of the present invention;

[0037] Figure 3 This is a schematic structural diagram of a second anti-seepage curtain of a combined anti-seepage curtain for a water conservancy project according to an embodiment of the present invention;

[0038] Figure 4 This is a schematic structural diagram of a third anti-seepage curtain of a combined anti-seepage curtain for a water conservancy project according to an embodiment of the present invention;

[0039] Figure 5 This is a schematic diagram of the installation positions of a waterproof coating and a geomembrane of a combined anti-seepage curtain for a water conservancy project according to an embodiment of the present invention;

[0040] Figure 6 The present invention is a flowchart of a construction method of a combined anti-seepage curtain for a water conservancy project according to an embodiment of the present invention.

[0041] In all the drawings, the same figure numbers represent the same technical features, specifically: 1-dam, 2-foundation trench, 3-assembled anti-seepage curtain, 31-first anti-seepage curtain, 311-first tenon, 32-second anti-seepage curtain, 321-first mortise, 322-second tenon, 33-third anti-seepage curtain, 331-second mortise, 34-W-shaped pattern, 4-cast-in-place anti-seepage curtain, 5-waterproof coating, 6-geomembrane, 7-first hole, 8-second hole, 9-protrusion, 10-slot. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0043] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, when an element is referred to as being "fixed to", "disposed on" or "provided on" another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or indirectly connected to the other element; the terms "installed", "connected", "connected" and "provided with" should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal connection of the two elements or the interaction relationship between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0044] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0045] like Figure 1-Figure 5As shown, one aspect of the present invention provides a combined anti-seepage curtain for a water conservancy project, comprising a dam 1, a foundation trench 2 arranged at the bottom of the dam 1, an assembled anti-seepage curtain 3 and a cast-in-place anti-seepage curtain 4 arranged in the foundation trench 2; the bottom of the assembled anti-seepage curtain 3 is the same width as the foundation trench; the cast-in-place anti-seepage curtain 4 is arranged on both sides of the assembled anti-seepage curtain 3; the assembled anti-seepage curtain 3 comprises a third anti-seepage curtain 33, a plurality of second anti-seepage curtains 32 and a first anti-seepage curtain 31 which are sequentially spliced ​​from top to bottom; the top of the third anti-seepage curtain 33 is provided with a continuous W-shaped pattern 34 for good engagement with the dam 1; ... The outer surfaces of the first anti-seepage curtain 31, the second anti-seepage curtain 32 and the third anti-seepage curtain 33 are concave and convex structures, which are used to increase the bite degree between each anti-seepage curtain and the cast-in-place concrete; the outer surfaces of the first anti-seepage curtain 31, the second anti-seepage curtain 32 and the third anti-seepage curtain 33 are provided with waterproof coating 5, and the outer surface of the waterproof coating is provided with geomembrane 6; by combining the assembled anti-seepage curtain 3 with the cast-in-place anti-seepage curtain 4 and setting up multiple anti-seepage measures at the same time, the molding quality and anti-seepage effect of the anti-seepage curtain are greatly improved; at the same time, this design also has strong construction feasibility and can adapt to different construction conditions and environments.

[0046] Furthermore, the dam 1 is the main structure of the water conservancy project, which is used to block the water flow, form a reservoir or prevent floods; the foundation trench 2 is arranged at the bottom of the dam 1, and is used to install the assembled anti-seepage curtain 3 and the cast-in-place anti-seepage curtain 4; the assembled anti-seepage curtain 3 is located in the foundation trench 2, and its bottom is the same width as the foundation trench 2; the cast-in-place anti-seepage curtain 4 is arranged on both sides of the assembled anti-seepage curtain 3, and together with the assembled anti-seepage curtain 3, it constitutes a joint anti-seepage system; the third anti-seepage curtain 33 is located at the uppermost layer of the assembled anti-seepage curtain 3, and a continuous W-shaped pattern 34 is provided on the top, through the W The shaped pattern 34 is engaged with the dam 1, which can enhance the connection and engagement between the anti-seepage curtain and the upper dam, and improve the integrity of the water conservancy facility; the first anti-seepage curtain 31, the second anti-seepage curtain 32 and the third anti-seepage curtain cooperate to form a multi-layer anti-seepage structure; the outer surfaces of the first, second and third anti-seepage curtains are designed as a concave-convex structure to increase the engagement with the cast-in-place concrete 4; the waterproof coating 5 is applied on the outer surfaces of the first, second and third anti-seepage curtains to improve the anti-seepage performance; the geomembrane 6 is arranged on the outer surface of the waterproof coating 5 to further enhance the anti-seepage effect;

[0047] Through the multi-layer anti-seepage structure and specific surface treatment, as well as the combination of prefabricated and cast-in-place concrete, the integrity and continuity of the anti-seepage curtain are enhanced, thereby improving the safety and durability of the water conservancy project.

[0048] Furthermore, if Figure 1-Figure 5As shown, the assembled anti-seepage curtain 3 is prefabricated in a factory from high-strength anti-seepage concrete; high-strength anti-seepage concrete means that the concrete has good strength and anti-seepage performance, and is suitable for anti-seepage structures in water conservancy projects; this high-strength anti-seepage concrete provides the necessary strength and durability for the anti-seepage curtain structure, ensuring the long-term stability of the anti-seepage curtain in water conservancy projects; the top of the third anti-seepage curtain 33 is connected to the bottom of the dam 1; the third anti-seepage curtain 33 and the second anti-seepage curtain 32, the two adjacent second anti-seepage curtains 32, and the second anti-seepage curtain 32 and the first anti-seepage curtain 31 are all mortise and tenon connections; through the cooperation of the tenon and the mortise, a tight connection of the structure can be achieved, while providing a certain degree of seismic resistance and structural stability; the present invention combines the strength and anti-seepage performance of modern materials with the structural stability and sealing of traditional mortise and tenon connections, providing a reliable anti-seepage solution for water conservancy projects.

[0049] Furthermore, if Figure 1-Figure 5As shown, the bottom of the first anti-seepage curtain 31 is a planar structure, which is adapted to the width of the bottom foundation trench, ensuring close contact between the anti-seepage curtain and the foundation trench, and helping to improve the anti-seepage effect; the top of the first anti-seepage curtain 31 is provided with a first tenon 311 connected to the bottom of the second anti-seepage curtain 32; the bottom of the second anti-seepage curtain 32 is provided with a first mortise 321 connected to the top of the first anti-seepage curtain 31; the top of the second anti-seepage curtain 32 is provided with a second tenon 322 connected to the bottom of the third anti-seepage curtain 33 or the bottom of the second anti-seepage curtain 32; the bottom of the third anti-seepage curtain 33 is provided with a second mortise 331 connected to the second tenon 322 at the top of the second anti-seepage curtain 32; the mortise and tenon connection is used to reduce the gap at the joint, thereby reducing the risk of leakage; the top of the third anti-seepage curtain 33 is provided with a W-shaped pattern, which can Enhance the interlocking effect between the anti-seepage curtain and the upper dam, and improve the integrity of the water conservancy facilities; the first tenon 311 and the second tenon 322 are respectively provided with a plurality of first holes 7; the first mortise 321 and the second mortise 331 are respectively provided with a plurality of second holes 8 which are consistent in position, quantity and size with the first holes 7 on the corresponding tenons; by inserting bolts into the first holes 7 and the second holes 8 at the corresponding positions, and pasting a layer of geomembrane 6 at the joints, the splicing of adjacent anti-seepage curtains is achieved; this bolt connection provides additional stability and strength for the anti-seepage curtain; the geomembrane 6 is usually made of materials such as high-density polyethylene (HDPE), has good anti-seepage properties, and can further ensure the anti-seepage effect at the joints; by pasting the geomembrane at the bolted joints, a complete anti-seepage layer can be formed to prevent moisture from penetrating through the joints. This double insurance design (mortise and tenon connection + bolts + geomembrane) greatly improves the anti-seepage performance of the anti-seepage curtain; the design of this assembled anti-seepage curtain achieves tight connection of the structure and effective anti-seepage through a combination of mortise and tenon connection, bolt fixing and geomembrane bonding, providing a reliable anti-seepage solution for water conservancy projects.

[0050] Furthermore, if Figure 1-Figure 5As shown, the first anti-seepage curtain 31 is provided with left-right symmetrical protrusions 9 and slots 10 from top to bottom on both sides; the second anti-seepage curtain 32 is provided with left-right symmetrical protrusions 9 and slots 10 from top to bottom on both sides; the second anti-seepage curtain 32 preferably has three protrusions 9 and two slots 10 on both sides; the third anti-seepage curtain 33 is provided with two protrusions 9 and one slot 10 on both sides; the symmetrical design ensures the balance and uniform force of the structure, thereby improving the overall stability; by increasing the number of protrusions, more support points are provided to enhance the stability of the structure; the design of the protrusions 9 and the slots 10 allows the various parts of the anti-seepage curtain to be locked with each other. The protrusions 9 can be inserted into the corresponding slots 10 to form a mechanical connection. This connection method not only provides structural stability, but also helps prevent moisture penetration; by using protrusions and slots at the connection, the gap at the joint can be reduced, thereby reducing the risk of leakage. In addition, the surfaces of these connectors may be specially waterproofed, such as by applying waterproof coatings or using sealing materials, to further improve the anti-seepage effect; prefabricated anti-seepage curtain units are produced in the factory and have a design of protrusions and slots, making on-site construction more convenient and quick. Construction personnel only need to hoist these units to the correct position and ensure that the protrusions are correctly inserted into the slots to complete the splicing.

[0051] Furthermore, the cast-in-place anti-seepage curtain 4 is made of soft stone; soft stone generally refers to stone with good strength and water resistance, such as sandstone or certain types of limestone. These materials can be used to make anti-seepage curtains after proper processing and treatment to improve their anti-seepage performance and durability; the waterproof coating 5 is acrylic waterproof coating; acrylic waterproof coating is a high-performance waterproof material with excellent weather resistance, water resistance, aging resistance and adhesion. It is a single-component water-emulsion waterproof coating made of pure acrylic polymer emulsion as the base material and other additives. This coating can be applied on wet surfaces, with water as the dispersion medium, is non-toxic, odorless, does not pollute the environment, and is an environmentally friendly product. It has good aging resistance, elongation, elasticity, adhesion and film-forming properties. The waterproof layer is a closed system with good overall waterproof effect, which is particularly suitable for the construction of special-shaped structural bases. The geomembrane 6 is a HDPE film with a thickness of 3 to 5 mm. HDPE geomembrane is a flexible waterproof material with a high anti-seepage coefficient (1×10^-17^cm / s). It has good heat resistance and cold resistance. The use environment temperature is high temperature 110℃ and low temperature -70℃. HDPE geomembrane has good chemical stability and can resist corrosion from strong acids, alkalis and oils. It is a good anti-corrosion material. At the same time, it has strong weather resistance and strong anti-aging performance. It can be used naked for a long time and maintain its original performance. The application of anti-seepage materials and geomembranes is intended to ensure the long-term stability and effectiveness of the anti-seepage curtain, while also taking into account environmental protection and construction convenience.

[0052] like Figure 6 As shown, the second aspect of the present invention provides a construction method of a combined anti-seepage curtain for a water conservancy project, comprising the following steps:

[0053] S1: Determine the size of the assembled anti-seepage curtain 3 required in the embankment project according to the geotechnical properties of the on-site soil, the design anti-seepage requirements, etc.;

[0054] S2: The assembled anti-seepage curtain 3 is manufactured in a prefabricated factory according to the size of the assembled anti-seepage curtain 3, and the mold is removed and maintained after the construction conditions are met; after reaching the age, the assembled anti-seepage curtain 3 is waterproofed; specifically, the waterproof coating 5 is first applied, and then the geomembrane 6 is attached; when applying the waterproof coating 5, multiple coats should be applied, and the application of the last coat should be carried out after the previous coat is completely dry, and the painting directions of the front and rear sides should be perpendicular to each other;

[0055] S3: Before construction begins, the site is leveled, the surveyors conduct line-laying measurement, and the supervision unit reviews the line-laying results; and excavation of foundation trench 2 is carried out;

[0056] S4: Use a lifting device to lift the first anti-seepage curtain 31, and use another lifting device to lift the second anti-seepage curtain 32 and the third anti-seepage curtain 33 in sequence, and sink them into the foundation trench 2 while splicing them, and align the tenons and mortises between the first anti-seepage curtain 31 and the second anti-seepage curtain 32, between two adjacent second anti-seepage curtains 32, and between the second anti-seepage curtain 32 and the third anti-seepage curtain 33; insert bolts into the corresponding holes to fix them, and stick a layer of geomembrane 6 at the joints again;

[0057] S5: When the assembled anti-seepage curtain 3 reaches the design elevation, the concrete pouring of the cast-in-place anti-seepage curtain 4 is carried out on both sides of the foundation trench; after the cast-in-place anti-seepage curtain 4 reaches the design strength, a joint anti-seepage curtain is formed between the assembled anti-seepage curtain 3, and then the subsequent construction of the upper structure of the embankment is carried out.

[0058] During the splicing process, the present invention requires strict quality control of each step to ensure that the splicing quality of the anti-seepage curtain meets the design and construction requirements; a combined anti-seepage system is formed by using waterproof coating, geomembrane, cast-in-place concrete, and prefabricated concrete, which can not only improve the molding quality of the anti-seepage curtain, but also greatly improve the anti-seepage effect of the combined anti-seepage curtain; factory production can be achieved to improve construction efficiency, and at the same time, the stability and sealing of the connection are ensured by mortise and tenon structure and bolt fixing, thereby improving the overall anti-seepage performance of the anti-seepage curtain; it can solve the problem that the prior art has great inconvenience during assembly at the construction site, and anti-seepage is not considered at the bolts, which has great application limitations.

[0059] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A combined anti-seepage curtain for water conservancy projects, characterized in that: It comprises a dam (1), a foundation trench arranged at the bottom of the dam (2), an assembled anti-seepage curtain (3) and a cast-in-place anti-seepage curtain (4) arranged in the foundation trench; wherein: The bottom of the assembled anti-seepage curtain (3) is as wide as the base trench; The cast-in-place anti-seepage curtain (4) is arranged on both sides of the assembled anti-seepage curtain (3); The assembled anti-seepage curtain (3) comprises a third anti-seepage curtain (33), a plurality of second anti-seepage curtains (32) and a first anti-seepage curtain (31) which are sequentially spliced ​​from top to bottom; The outer surfaces of the first anti-seepage curtain (31), the second anti-seepage curtain (32) and the third anti-seepage curtain (33) are concave-convex convex structures, which are used to increase the bite degree between each anti-seepage curtain and the cast-in-place concrete; the outer surfaces of the first anti-seepage curtain (31), the second anti-seepage curtain (32) and the third anti-seepage curtain (33) are provided with waterproof coating (5); the outer surface of the waterproof coating is provided with a geomembrane (6); By combining the assembled anti-seepage curtain (3) with the cast-in-place anti-seepage curtain (4), and simultaneously providing multiple anti-seepage measures, the molding quality and anti-seepage effect of the anti-seepage curtain can be greatly improved.

2. The combined anti-seepage curtain for water conservancy projects according to claim 1, characterized in that: The top of the third anti-seepage curtain (33) is connected to the bottom of the dam (1); the third anti-seepage curtain (33) and the second anti-seepage curtain (32), two adjacent second anti-seepage curtains (32), and the second anti-seepage curtain (32) and the first anti-seepage curtain (31) are all connected by mortise and tenon joints.

3. The combined anti-seepage curtain for water conservancy projects according to claim 2, characterized in that: The bottom of the first anti-seepage curtain (31) is a planar structure; The top of the first anti-seepage curtain (31) is provided with a first tenon (311) connected to the bottom of the second anti-seepage curtain (32).

4. The combined anti-seepage curtain for water conservancy projects according to claim 3 is characterized in that: The bottom of the second anti-seepage curtain (32) is provided with a first mortise (321) connected to the top of the first anti-seepage curtain (31); The top of the second anti-seepage curtain (32) is provided with a second tenon (322) connected to the bottom of the third anti-seepage curtain (33) or the bottom of the second anti-seepage curtain (32).

5. The combined anti-seepage curtain for water conservancy projects according to claim 4, characterized in that: The bottom of the third anti-seepage curtain (33) is provided with a second mortise (331) connected to the top of the second anti-seepage curtain (32); The top of the third anti-seepage curtain (33) is provided with a W-shaped pattern (34).

6. The combined anti-seepage curtain for water conservancy projects according to claim 5, characterized in that: The first tenon (311) and the second tenon (322) are respectively provided with a plurality of first holes (7); The first mortise (321) and the second mortise (331) are respectively provided with a plurality of second holes (8) having the same position, number and size as the first hole (7) on the corresponding tenon; bolts are inserted into the first holes (7) and the second holes (8) at corresponding positions, and a geomembrane (6) is pasted at the bolt joint.

7. A combined anti-seepage curtain for water conservancy projects according to any one of claims 1 to 6, characterized in that: The cast-in-place anti-seepage curtain (4) is made of soft stone.

8. A combined anti-seepage curtain for water conservancy projects according to any one of claims 1 to 6, characterized in that: The waterproof coating (5) is an acrylic waterproof coating.

9. A combined anti-seepage curtain for water conservancy projects according to any one of claims 1 to 6, characterized in that: The geomembrane (6) is a HDPE film with a thickness of 3 to 5 mm.

10. A construction method for a combined anti-seepage curtain for a water conservancy project, characterized in that: The method is implemented by using a combined anti-seepage curtain for a water conservancy project according to any one of claims 1 to 9, comprising the following steps: S1: Determine the size of the assembled anti-seepage curtain (3) required in the embankment project according to the geotechnical properties of the on-site soil, the design anti-seepage requirements, etc.; S2: The assembled anti-seepage curtain (3) is manufactured in a prefabrication factory according to the size of the curtain, and the mold is removed and maintained after the construction conditions are met; after the assembled anti-seepage curtain (3) reaches the age, the waterproof coating (5) is first applied to the assembled anti-seepage curtain (3), and then the geomembrane (6) is attached; S3: Before construction begins, the site is leveled, surveyors conduct line-laying measurements, and the supervision unit reviews the line-laying results; and excavation of the foundation pit (2) is carried out; S4: using a lifting device to lift the first anti-seepage curtain (31), using another lifting device to lift the second anti-seepage curtain (32) and the third anti-seepage curtain (33) in sequence, and sinking them into the foundation trench (2) while splicing them, aligning the tenons and mortises between the first anti-seepage curtain (31) and the second anti-seepage curtain (32), between two adjacent second anti-seepage curtains (32), and between the second anti-seepage curtain (32) and the third anti-seepage curtain (33); inserting bolts into corresponding holes to fix them, and pasting a layer of geomembrane (6) at the joints again; S5: When the assembled anti-seepage curtain (3) reaches the design elevation, the concrete pouring of the cast-in-place anti-seepage curtain (4) is carried out on both sides of the foundation trench; after the cast-in-place anti-seepage curtain (4) reaches the design strength, a joint anti-seepage curtain is formed between the assembled anti-seepage curtain (3), and then the subsequent construction of the upper structure of the embankment is carried out.

Images