Construction method of water conservancy irrigation anti-seepage channel

Abstract

The invention relates to a construction method of a water conservancy irrigation anti-seepage channel. The construction method comprises the steps of channel bed foundation treatment; laying a composite protective layer on the channel bed foundation; partition plates are fixed on the composite protective layer at set intervals; laying a waterproof film on the composite protective layer; a sealing jacket is installed on the partition plate, and the waterproof film is pressed and attached to the partition plate through the sealing jacket; and a concrete layer is laid on the waterproof film. The waterproof film is fixed through the partition plate and the sealing jacket, the sealing jacket is mechanically pressed by pouring concrete, installation is fast and reliable, dependence on the technical level of constructors is reduced, and the reliability of sealing quality is guaranteed; and after pouring is completed, sealing of the expansion joint is achieved through the sealing jacket, active repairing is achieved through the rainwater expansion strip, an efficient and reliable composite anti-seepage structure is formed, and the sealing reliability of the expansion joint is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of water conservancy and irrigation technology, and in particular to a construction method for a water conservancy and irrigation seepage prevention channel. Background Technology

[0002] Irrigation canals are crucial infrastructure for the efficient utilization and distribution of water resources. Concrete lining is the most common form of seepage prevention in irrigation canals. However, the inherent thermal expansion and contraction and drying shrinkage of concrete, as well as the potential for uneven settlement of the foundation, can easily lead to cracks in the lining structure, causing water leakage. Currently, the main solution is to add expansion joints to reduce the overall stress of the lining structure and thus minimize cracking.

[0003] Traditional expansion joint treatments often involve filling with asphalt plywood or closed-cell foam board and then sealing the surface with sealant. The sealing effect is highly dependent on the skill level of the construction workers, making it difficult to guarantee uniform quality. The sealant is prone to aging when exposed to the natural environment for a long time, which leads to the failure of its bond with the concrete, forming leakage channels and resulting in poor durability. Furthermore, after leakage occurs, it is necessary to interrupt the water supply and manually remove the original sealant before re-constructing, resulting in high maintenance costs and long cycles.

[0004] Based on the above-mentioned technical problems, this application proposes a construction method for a water conservancy irrigation seepage prevention channel. Summary of the Invention

[0005] The purpose of this invention is to provide a construction method for seepage-proof irrigation channels to solve the technical problems mentioned in the background art. This purpose is achieved through the following technical solution: A construction method for a seepage-proof irrigation canal includes the following steps: Step S1. Canal bed foundation treatment; Step S2. Lay a composite protective layer on the canal bed foundation; Step S3. Fix the partition plates on the composite protective layer at the set intervals; Step S4. Lay a waterproof membrane on the composite protective layer; Step S5. Install a sealing jacket on the partition plate. The sealing jacket presses the waterproof membrane onto the partition plate, and the waterproof membrane is tightly attached to the composite protective layer. Step S6. Lay a concrete layer on the waterproof membrane, the thickness of which is less than or equal to the height of the baffle.

[0006] Furthermore, step S2 specifically includes: Step S21. Lay a layer of gravel on the prepared canal bed, level it, and compact it. Step S22. Lay a layer of modified clay on the gravel layer, level it, and compact it. Step S23. Lay geotextile on the modified clay layer and fix it with ground nails.

[0007] Furthermore, step S22 specifically includes: Step S221. Add clay, cement and hardener to a mixer and dry mix to ensure even mixing; Step S222. With the mixer running, slowly and evenly sprinkle polypropylene fibers with a length of 12-20mm into the mixer, and continue mixing until the mixture is uniform. Step S223. With the mixer running, add water to the mixer in batches until a uniformly mixed mixture is formed; Step S224. Lay the mixture in layers onto the channel bed and compact it using a roller. Of which, by mass percentage, clay accounts for 70%-80%, cement accounts for 8%-12%, curing agent accounts for 3%-5%, polypropylene fiber accounts for 0.2%-0.5%, and water accounts for 10%-15%.

[0008] Furthermore, the partition is a rigid foam board, which includes a base plate and a baffle plate arranged perpendicular to the base plate. The base plate is fixed on the composite protective layer, and the baffle plate is arranged parallel to the cross-section of the seepage prevention channel.

[0009] Furthermore, the waterproof membrane is a composite geomembrane consisting of two layers of fabric and one layer of membrane.

[0010] Furthermore, the sealing jacket has a U-shaped structure, with protrusions on both sides that extend at least partially into the concrete layer.

[0011] Furthermore, the sealing jacket is provided with a water-swellable strip on its side, which is arranged along the length of the sealing jacket.

[0012] The technical solutions provided in this application have at least the following technical effects or advantages: 1. By combining the waterproof membrane as the main seepage prevention component, the sealing jacket for compression and sealing, and the rainwater expansion strip for active repair, a highly efficient and reliable composite seepage prevention structure is formed, which greatly improves the reliability of the expansion joint seal. 2. When water seeps into the sealing jacket along the expansion joint, the embedded water-swellable strip expands rapidly upon contact with water, automatically sealing the leakage path, realizing the active repair of the seepage prevention channel, significantly improving the durability of the project, and saving maintenance costs; 3. The waterproof membrane is fixed by the partition plate and the sealing jacket, and the sealing jacket is mechanically pressed by pouring concrete. The installation is quick and reliable, which reduces the dependence on the technical level of the construction personnel and ensures the reliability of the sealing quality. 4. Rigid foam plastic partition boards serve as both templates and fillers, effectively adapting to deformations caused by thermal expansion and contraction or geological subsidence, reducing channel stress, and preventing channel cracks. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a cross-sectional view of the seepage prevention channel according to an embodiment of this application; Figure 2 for Figure 1 A magnified view of a portion of the image.

[0015] Reference numerals in the attached drawings: 1. Channel bed base; 2. Composite protective layer; 21. Gravel layer; 22. Modified clay layer; 23. Geotextile; 3. Separator; 31. Base plate; 32. Baffle; 4. Waterproof membrane; 5. Sealing jacket; 51. Protrusion; 52. Water-swellable strip; 6. Concrete layer. Detailed Implementation

[0016] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0017] Example like Figures 1-2 As shown, a construction method for a water conservancy irrigation seepage prevention channel includes the following steps: Step S1. Channel bed foundation treatment: Excavate or fill the canal bed according to the designed cross-section, and compact the canal bed base 1 with a compaction degree of not less than 93%.

[0018] Step S2. Lay composite protective layer 2 on the canal bed foundation: The composite protective layer 2 consists of, from bottom to top, a gravel layer 21, a modified clay layer 22, and a geotextile 23. The specific construction process includes: Step S21. Lay a 10-15cm layer of natural gravel on the prepared canal bed, level it and compact it to obtain gravel layer 21.

[0019] Step S22. Lay a 10cm thick layer of modified clay on the gravel layer 21, level it, and compact it to obtain a modified clay layer 22. The compaction degree of the modified clay layer 22 is ≥93%. The specific preparation process of modified clay includes: Step S221. By weight percentage, add 75% clay, 10% cement and 4% curing agent to the mixer and dry mix to ensure uniform mixing; Step S222. With the mixer running, slowly and evenly sprinkle polypropylene fibers with a length of 12-20mm into the mixer, and continue mixing for 2-3 minutes to fully disperse the fibers. Step S223. With the mixer running, add water to the mixer in batches for wet mixing until a mixture with uniform fiber distribution is formed; Step S224. Lay the mixture in layers onto the channel bed and compact it using a roller.

[0020] The modified clay layer prepared by this method not only has excellent seepage prevention performance, but its ultimate tensile strength can be increased by more than 30% compared with the traditional modified soil without fiber, and its crack resistance is significantly enhanced.

[0021] Step S23. Lay geotextile on the modified clay layer and fix it with ground nails.

[0022] The placement of geotextiles can enhance the tensile strength of the soil and improve the bearing capacity of the foundation, while also preventing plant roots from affecting the seepage prevention performance of the seepage prevention channel.

[0023] Step S3. Fix the partition plates 3 on the composite protective layer 2 at the set intervals: The partition plate 3 is made of rigid foam board. The partition plate 3 includes a horizontally arranged base plate 31 and a baffle 32 vertically fixed on the base plate 31. The base plate 31 is fixed on the composite protective layer 2, and the baffle 32 is arranged parallel to the cross-section of the seepage prevention channel.

[0024] Step S4. Lay the waterproof membrane 4 on the composite protective layer 2: Waterproof membrane 4 is a composite geomembrane consisting of two layers of fabric and one layer of membrane, designed to improve its puncture resistance. The thickness of waterproof membrane 4 is ≥0.5mm. During installation, it should be laid flat and taut. Adjacent waterproof membranes 4 are joined by hot-melt welding, with an overlap width of not less than 10cm.

[0025] Step S5. Install the sealing sleeve 5 on the partition plate 3. The sealing sleeve 5 presses the waterproof membrane 4 onto the partition plate 3, so that the waterproof membrane 4 is tightly attached to the composite protective layer 2, and there are no wrinkles or gaps between the waterproof membrane 4 and the composite protective layer 2 and the partition plate 3.

[0026] like Figure 2 As shown, the sealing jacket 5 is a long strip with a U-shaped cross-section. The sealing jacket 5 is snapped onto the baffle 32 to fix the waterproof membrane 4. Three protrusions 51 extending along the length of the sealing jacket 5 are symmetrically fixed on both sides of the sealing jacket 5. A water-swellable strip 52 is attached between two adjacent protrusions 51.

[0027] Step S6. Lay a concrete layer 6 on the waterproof membrane 4. The thickness of the concrete layer 6 is less than or equal to the height of the baffle 32.

[0028] A small channel slipform paver was used to continuously pour 10cm thick C20 concrete, forming a concrete layer 6. Manual finishing and smoothing followed immediately to ensure a smooth surface and reduce water flow resistance.

[0029] After pouring, immediately cover with a layer of geotextile and assign personnel to regularly water and cure for 14 days. At this point, the partition plate 3 is permanently embedded in the concrete, forming the initial structure of the expansion joint, eliminating the need for subsequent expansion joint treatment and improving construction efficiency. The sealing jacket 5 is located at the top of the expansion joint, and the protrusions 51 on both sides of the sealing jacket 5 are embedded in the concrete to seal the expansion joint. When there is a gap between the sealing jacket 5 and the concrete causing leakage, the rainwater expansion strip 52 absorbs water and expands to fill the gap, achieving automatic sealing of the leakage point.

[0030] Comprehensive Experiment Test of seepage prevention performance of modified clay layer A variable head permeability test was used to compare the permeability coefficients of ordinary compacted clay and modified clay layers: The permeability coefficient of ordinary compacted clay is 5.0 × 10⁻⁶. -6 The permeability coefficient of the modified clay layer is 8.0 × 10 cm / s. -7 cm / s, which shows that the seepage prevention performance of the modified clay layer in this application exceeds one order of magnitude, and the modified clay layer itself constitutes a highly efficient seepage prevention barrier.

[0031] Crack resistance test of modified clay layer The fracture toughness of the modified clay was observed after wet-dry cycles / freeze-thaw cycles: Multiple through cracks (average width > 1 mm) appeared on the surface of ordinary modified soil samples, while only fine, discontinuous network microcracks (average width < 0.2 mm) appeared on fiber-modified soil samples.

[0032] It is evident that the bridging effect of fibers in the modified clay layer effectively inhibits crack propagation.

[0033] Overall seepage prevention effect simulation A channel model section, including a composite protective layer, a waterproof membrane, and an expansion joint with a sealed jacket, was constructed for a long-term full-water test.

[0034] Under defect-free conditions, the overall leakage of the structure is only about 3% of that of a pure concrete channel of the same level.

[0035] After artificially damaging the expansion joint, the initial leakage increases, but within 12-24 hours, the leakage gradually decreases and stabilizes at less than 15% of the initial value.

[0036] It is evident that the seepage prevention channel of this application has an effective active repair capability.

[0037] Construction efficiency comparison Select channels of equal size and length at both ends for construction and record the construction time: Compared with the traditional construction method of first pouring concrete and then treating the expansion joint, this application uses a partition plate to be formed in one go, which eliminates the processes of cutting, cleaning and filling adhesive, saving about 70% of the time in the treatment of expansion joints and shortening the total construction period by about 15-20%.

[0038] The technical solutions provided in this application have at least the following technical effects or advantages: 1. By combining the waterproof membrane as the main seepage prevention component, the sealing jacket for compression and sealing, and the rainwater expansion strip for active repair, a highly efficient and reliable composite seepage prevention structure is formed, which greatly improves the reliability of the expansion joint seal. 2. When water seeps into the sealing jacket along the expansion joint, the embedded water-swellable strip expands rapidly upon contact with water, automatically sealing the leakage path, realizing the active repair of the seepage prevention channel, significantly improving the durability of the project, and saving maintenance costs; 3. The waterproof membrane is fixed by the partition plate and the sealing jacket, and the sealing jacket is mechanically pressed by pouring concrete. The installation is quick and reliable, which reduces the dependence on the technical level of the construction personnel and ensures the reliability of the sealing quality. 4. Rigid foam plastic partition boards serve as both templates and fillers, effectively adapting to deformations caused by thermal expansion and contraction or geological subsidence, reducing channel stress, and preventing channel cracks.

[0039] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A construction method for a seepage-proof irrigation canal, characterized in that, Includes the following steps: Step S1. Canal bed foundation treatment; Step S2. Lay a composite protective layer on the canal bed foundation; Step S3. Fix the partition plates on the composite protective layer at the set intervals; Step S4. Lay a waterproof membrane on the composite protective layer; Step S5. Install a sealing jacket on the partition plate, the sealing jacket pressing the waterproof membrane onto the partition plate, and the waterproof membrane is in close contact with the composite protective layer; Step S6. Lay a concrete layer on the waterproof membrane, wherein the thickness of the concrete layer is less than or equal to the height of the baffle.

2. The construction method of a water conservancy irrigation seepage prevention channel according to claim 1, characterized in that, Step S2 specifically includes: Step S21. Lay a layer of gravel on the prepared canal bed, level it, and compact it. Step S22. Lay a layer of modified clay on the gravel layer, level it, and compact it. Step S23. Lay geotextile on the modified clay layer and fix it with ground nails.

3. The construction method of a water conservancy irrigation seepage prevention channel according to claim 2, characterized in that, Step S22 specifically includes: Step S221. Add clay, cement and hardener to a mixer and dry mix to ensure even mixing; Step S222. With the mixer running, slowly and evenly sprinkle polypropylene fibers with a length of 12-20mm into the mixer, and continue mixing until the mixture is uniform. Step S223. With the mixer running, add water to the mixer in batches until a uniformly mixed mixture is formed; Step S224. Lay the mixture in layers onto the channel bed and compact it using a roller. Of which, by mass percentage, clay accounts for 70%-80%, cement accounts for 8%-12%, curing agent accounts for 3%-5%, polypropylene fiber accounts for 0.2%-0.5%, and water accounts for 10%-15%.

4. The construction method of a water conservancy irrigation seepage prevention channel according to claim 1, characterized in that, The partition is a rigid foam board, which includes a base plate and a baffle plate arranged perpendicular to the base plate. The base plate is fixed on the composite protective layer, and the baffle plate is arranged parallel to the cross-section of the seepage prevention channel.

5. The construction method of a water conservancy irrigation seepage prevention channel according to claim 1, characterized in that, The waterproof membrane is a composite geomembrane consisting of two layers of fabric and one layer of membrane.

6. The construction method of a water conservancy irrigation seepage prevention channel according to claim 1, characterized in that, The sealing jacket has a U-shaped structure, and protrusions are provided on both sides of the sealing jacket, with the protrusions extending at least partially into the concrete layer.

7. The construction method of a water conservancy irrigation seepage prevention channel according to claim 1, characterized in that, The sealing jacket is provided with a water-swellable strip on its side, and the water-swellable strip is provided along the length of the sealing jacket.

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