Impermeable wall construction technology

Abstract

The invention relates to the technical field of civil engineering, in particular to an anti-seepage wall construction process which comprises the following steps: S1, geological investigation and site preparation: exploring geological conditions through drilling equipment and geological radar, analyzing a soil layer at each depth, and determining a stratum structure, soil properties and an underground water level; underground obstacles, such as waste pipelines and rocks, are detected. According to the method, an accurate underground condition map is provided for construction preparation through meticulous geological investigation and obstacle recognition, unknown obstacles possibly encountered in construction are effectively avoided, and the risks of construction delay and high cost are reduced. Through the optimal configuration of the slurry circulating system, the material use in the construction site is managed, the environmental influence is reduced, and the material utilization rate is improved. Accurate lofting and strict control over guide wall construction guarantee accurate alignment of the structure, and therefore the final quality and safety of a project are guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of civil engineering, and in particular to a construction process of an anti-seepage wall. Background Art

[0002] The construction process of anti-seepage wall is a special technology in civil engineering, which is mainly used to prevent structural damage or soil erosion caused by water penetration. This process is widely used in dams, tunnels, underground facilities and environmental protection projects. Its main purpose is to control water flow by building a barrier layer in the soil to ensure the stability of the structure and extend its service life. The anti-seepage wall is usually made of concrete, steel or special materials. Its design and construction require precise engineering calculations and high-quality construction technology to achieve the desired anti-seepage effect.

[0003] A patent application with Chinese patent publication number CN115748782A discloses a polymer flexible anti-seepage wall construction process, which includes the following steps: S1 construction preparation, S2 water jet wall building, S3 concrete pouring, and S4 composite material coating; step S1 construction preparation includes the following steps: S11: calculating parameters, staking out the construction axis of the water jet wall building, leveling the site, and laying tracks; S12: construction preparation, staking out the center of the slot section after calculation in S11, and dividing the slot section; S13: mechanical assistance, moving the wall building machine to the horizontal track, and adjusting and inspecting the wall building machine; step S2 water jet wall building includes the following steps: S21: slotting the anti-seepage wall, using a water pump to deliver high-pressure water to the wall building machine former, and using a winch to operate the wall building machine former to form; S211: drilling holes in the permeable wall, spraying high-speed slurry through a high-pressure cement slurry nozzle to pre-cut the surrounding soil, and completing the drilling; S22: forming the permeable wall, forming a permeable wall frame through the wall building machine. Although this kind of anti-seepage wall construction process uses geophysical non-destructive testing for the anti-seepage wall, which is more conducive to the protection of the anti-seepage wall. However, the mud cannot be effectively recycled after use, resulting in material waste and environmental pollution. For example, if the mud is not properly handled, the construction site may face serious environmental pollution problems, which may cause irreversible damage to the local ecological environment. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings in the prior art and to propose an anti-seepage wall construction process.

[0005] In order to achieve the above object, the present invention adopts the following technical scheme, a construction process of an anti-seepage wall, comprising the following steps: S1, geological survey and site preparation, using drilling equipment and geological radar to survey the geological conditions, analyze the soil layers at each depth, determine the stratum structure, soil properties and groundwater level; detect underground obstacles such as abandoned pipes and rocks, and provide data support for the selection of construction parameters; then, based on the survey results, use excavators and bulldozers to clear obstacles within a depth of 2-4 meters on the ground, and level and compact the site to ensure that the foundation density reaches 90%-95%, creating good conditions for construction; S2, test and construction preparation, on the cleaned and leveled site, select an area with similar geological conditions to the construction site for construction process tests, including hole making, wall protection mud and wall pouring, to optimize the mud ratio and construction equipment parameters; then adjust the mud ratio and equipment parameters according to the test results to optimize the construction process; use a total station and theodolite to lay out the core wall axis on the construction site; S3, guide wall construction and mud system layout, use excavators to dig guide trenches along the predetermined core wall axis, and cast trapezoidal reinforced concrete guide walls to ensure that the guide wall structure meets the design requirements and quality standards; then arrange a complete mud pool system upstream of the sluice area, including slurry storage tanks, sedimentation tanks and recovery tanks, and lay transportation pipelines to ensure the continuity and efficiency of mud circulation; S4: Construction execution and acceptance, mobilizing the required construction equipment and providing technical and safety training to operators; preparing the required wall protection slurry and excavating the trench section with the support of the protective slurry to ensure that the trench wall is stable and the shape meets the design; then inspecting the completed trench section, including the verticality, plane position and sedimentation thickness of the trench section.

[0006] Preferably, the step S1 includes: S101, geological survey, geological survey within the scope of the project, use drilling equipment to sample and analyze the soil layer at each depth, determine the geological structure, stratum distribution, soil properties and groundwater level information, use radar and metal detectors to find out the underground obstacles at the anti-seepage wall, including abandoned pipes, rocks and concrete blocks, and organize the survey results into a report to provide a basis for selecting construction parameters and obtain a geological survey report; S102, analyzing the geological survey report, determining the location and nature of underground obstacles based on the data in the report, using excavators and bulldozers to remove underground obstacles within a depth of 2-4 meters from the ground, including abandoned pipes, rocks and concrete blocks, selecting a slurry circulation process based on soil quality and hydrological conditions, with the length of each trench section being 10-20 meters, and formulating a construction plan; S103, site cleaning: under the guidance of the construction plan, use excavators and bulldozers to level the construction area, remove underground obstacles within a depth of 2-4 meters, including abandoned pipes, rocks and concrete blocks, sort and stack the cleared waste, and compact the site with a vibratory roller to make the foundation density reach 90%-95%, thereby obtaining a cleaned construction site.

[0007] Here, abandoned underground pipes and rocks can be detected to provide data support for the selection of construction parameters.

[0008] Preferably, the step S2 comprises: S201, conducting tests on the cleaned construction site, selecting an area with similar geological conditions to the construction site of the anti-seepage wall, conducting tests on hole making, wall protection slurry and wall casting construction technology, optimizing slurry ratio, construction equipment parameters and construction process flow according to the test results, recording the test data, providing a reference for formal construction, and obtaining construction process parameters; S202, adjusting the construction process parameters, determining the mud ratio according to the test results, adjusting the equipment parameters, optimizing the construction process, and obtaining optimized construction parameters; S203, stakeout of the core wall axis. Under the guidance of the optimized construction parameters and according to the design drawings, the axis of the anti-seepage wall is set upstream and downstream of the lock chamber. The center line and edge line of the core wall are accurately staked out using a total station and a theodolite. The axis deviation is controlled within ±5-10mm. Obvious marks are set up to ensure the accuracy of the position during the construction process, and the stakeout of the core wall axis is obtained.

[0009] Here, the accuracy of the position during the construction process can be ensured.

[0010] Preferably, the S3 step includes: S301, excavating a guide ditch at the axis position of the core wall where the lofting is completed, using an excavator to excavate a guide ditch with a depth of 1.2-1.5 meters and a width of 0.8-1.0 meters along the axis position of the core wall, removing debris in the ditch, ensuring that the bottom is flat, and casting trapezoidal reinforced concrete guide walls on both sides, with a guide wall height of 1.2-1.5 meters, a top 0.1-0.2 meters higher than the construction site, and a net distance of 65-70 centimeters between the inner and outer guide walls, to obtain a completed guide wall; S302, inspect and adjust the completed guide wall, measure the plane position of the guide wall, and control the deviation within ±10mm; inspect the verticality of the guide wall, and the deviation does not exceed 0.5%; detect the height difference of the upper surface of the guide wall, and the height difference of a single piece is less than 5mm, and the height difference within the entire length is less than 10mm, and trim the parts that do not meet the requirements to ensure that the quality of the guide wall meets the construction requirements and obtain a qualified guide wall; S303, a mud pool system is arranged on both sides of the qualified guide wall. According to the construction plan, a mud pool is set up upstream of the gate area, including a slurry storage pool, a sedimentation pool and a recovery pool. The capacity of the mud pool meets the needs of continuous construction. A mud conveying pipeline is laid, using a pipeline with a diameter of 70-90 mm and a three-way valve to facilitate the transportation and recovery of mud, thereby obtaining a complete mud circulation system.

[0011] The S4 step includes: S401, prepare construction equipment. According to the construction plan, mobilize hydraulic grabs, dump trucks, drilling rigs, excavators, crawler cranes, concrete grouting racks, conduits, mud preparation systems, mud pumps and loaders, check the performance parameters of the equipment to ensure that the equipment is in good condition, conduct technical briefings and safety training for operators, and obtain the prepared construction equipment; S402, preparation of wall protection mud, in the perfect mud circulation system, using secondary bentonite as the slurry material, adding water and dispersant, stirring evenly according to the proportion, making new mud, the mud swelling time is not less than 24 hours, and the wall protection mud that meets the requirements is obtained, the density of the mud is less than 1.10g / cm³, the viscosity is 30-90 seconds, and the sand content is less than 2%; S403, injecting the wall protection slurry that meets the requirements into the trench section. When excavating the trench section, use a hydraulic grab to dig a trench between the guide walls, and inject the wall protection slurry into the trench at the same time, keeping the slurry liquid level 0.5-1.0 meters higher than the groundwater level to prevent the trench wall from collapsing, controlling the trenching speed and the verticality of the grab, ensuring that the shape and size of the trench section meet the requirements, and the excavation depth reaches the design requirements, so as to obtain the excavated trench section; S404, inspect the excavated trench section, use a plumb bob and inclinometer to measure the plane position, depth and verticality of the trench section, the plane position deviation of the trench section shall not exceed ±30mm, the trench bottom depth shall meet the design requirements, the trench wall verticality deviation shall be less than 0.3%, the trench bottom shall be cleaned to ensure that the sediment thickness is less than 100mm, the mud performance indicators shall meet the casting requirements, and the qualified trench section shall be obtained.

[0012] S5, pouring concrete in the qualified trough section, using the method of concrete under the conduit, the diameter of the conduit is 200-300 mm, the bottom of the conduit is 30-50 cm away from the bottom of the trough, the concrete mix ratio meets the design requirements, the slump is 200-240 mm, the expansion is 340-400 mm, continuous pouring, controlling the depth of the conduit buried in the concrete to be 1-6 meters, ensuring that the concrete surface rises evenly, and the speed is not less than 2 meters / hour, to obtain a cast anti-seepage wall.

[0013] S6, conduct quality inspection on the cast anti-seepage wall, drill an inspection hole with a diameter of 91 mm on the axis of the wall, and the depth is the same as that of the anti-seepage wall, take cores, test the strength and density of the concrete, conduct a penetration test on the wall, and check its anti-seepage performance. The permeability coefficient should be less than 1×10⁻ 7 cm / s. For the parts that do not meet the requirements, reinforcement measures such as grouting treatment are taken to ensure the overall quality of the anti-seepage wall and obtain a qualified anti-seepage wall.

[0014] Preferably, in step S202, the density of the mud is controlled at 1.05-1.15 g / cm³, the viscosity is 30-90 seconds, and the sand content is less than 2%.

[0015] Preferably, in step S202, the adjustment of equipment parameters is specifically that the lifting speed of the grab bucket is adjusted to 1-2 m / min, and the pulling force of the winch is adjusted to 150-200 kN.

[0016] Preferably, in step S402, the dispersant is Na2CO3 in a ratio of water: bentonite: Na2CO3 = 100: (5-8): (0-0.3).

[0017] Preferably, in step S303, the slurry storage tank has a capacity of 50-100 cubic meters to ensure that actual needs are met.

[0018] Compared with the prior art, the advantages and positive effects of the present invention are: In the present invention, meticulous geological surveys and obstacle identification provide accurate underground situation maps for construction preparation, effectively avoiding unknown obstacles that may be encountered during construction, and reducing the risks of construction delays and cost overruns. The optimized configuration of the mud circulation system manages the use of materials within the construction site, reduces environmental impact and improves material utilization. Strict control of precise lofting and guide wall construction ensures accurate alignment of the structure, thereby ensuring the final quality and safety of the project. These improvements in technical means and operational accuracy have greatly improved the safety, reliability and economic benefits of construction compared to traditional processes, meeting the high standards of accuracy and environmental protection requirements of modern civil engineering. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the steps of the present invention. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution 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.

[0021] See also Figure 1 The present invention provides a technical solution: a construction process of an anti-seepage wall, comprising the following steps: S1, geological survey and site preparation, using hydraulic drilling machines and geological radar to survey the geological conditions, analyze the soil layers at each depth, determine the stratum structure, soil properties and groundwater level; detect underground obstacles such as abandoned pipes and rocks, and provide data support for the selection of construction parameters; then, based on the survey results, use excavators and bulldozers to clear obstacles within a depth of 2-4 meters on the ground, and level and compact the site to ensure that the foundation density reaches 90%-95%, creating good conditions for construction; S2, test and construction preparation, on the cleaned and leveled site, select an area with similar geological conditions to the construction site for construction process tests, including hole making, wall protection mud and wall pouring, to optimize the mud ratio and construction equipment parameters; then adjust the mud ratio and equipment parameters according to the test results to optimize the construction process; use a total station and theodolite to lay out the core wall axis on the construction site; S3, guide wall construction and mud system layout, use excavators to dig guide trenches along the predetermined core wall axis, and cast trapezoidal reinforced concrete guide walls to ensure that the guide wall structure meets the design requirements and quality standards; then arrange a complete mud pool system upstream of the sluice area, including slurry storage tanks, sedimentation tanks and recovery tanks, and lay transportation pipelines to ensure the continuity and efficiency of mud circulation; S4: Construction execution and acceptance, mobilizing the required construction equipment and providing technical and safety training to operators; preparing the required wall protection slurry and excavating the trench section with the support of the protective slurry to ensure that the trench wall is stable and the shape meets the design; then inspecting the completed trench section, including the verticality, plane position and sedimentation thickness of the trench section.

[0022] In this embodiment, step S1 includes: S101, geological survey, geological survey within the scope of the project, use drilling equipment to sample and analyze the soil layer at each depth, determine the geological structure, stratum distribution, soil properties and groundwater level information, use radar and metal detectors to find out the underground obstacles at the anti-seepage wall, including abandoned pipes, rocks and concrete blocks, and organize the survey results into a report to provide a basis for selecting construction parameters and obtain a geological survey report; Perform geological surveys and obstacle detection. First, use drilling equipment to sample soil layers at different depths in the project area. During the sampling process, operators mark and record soil samples at each specific depth in detail to ensure the accuracy and traceability of the samples. Analysis of the soil samples obtained can clarify the nature and distribution of the soil layers. Next, use underground radar and metal detectors to conduct in-depth scans of the cut-off wall construction area to find and identify underground obstacles such as abandoned pipes, rocks and concrete blocks. This process ensures that the location and nature of obstacles are accurately recorded before construction to avoid accidents during construction. After completing these surveys, all data and analysis results are compiled into a geological survey report to provide a basis for decision-making for subsequent construction.

[0023] S102, analyze the geological survey report, determine the location and nature of underground obstacles based on the data in the report, use excavators and bulldozers to remove underground obstacles within a depth of 2-4 meters from the ground, including abandoned pipes, rocks and concrete blocks, select the mud circulation process based on the soil quality and hydrological conditions, and formulate a construction plan with the length of each trench section being 10-20 meters; Underground obstacles are cleared and construction plans are developed. Data from the geological survey report is used to accurately locate and analyze the specific conditions of underground obstacles. Based on this information, excavators and bulldozers are used to remove these obstacles at a depth of 2 to 4 meters. In addition, based on the specific analysis of soil and hydrological conditions, the appropriate mud circulation process is selected to ensure that soil stability is guaranteed during the construction of each trench section (10 to 20 meters long). Finally, the construction plan will describe in detail the operating procedures and required equipment for each step, providing a guide to ensure construction safety and efficiency.

[0024] S103, site cleaning. Under the guidance of the construction plan, use excavators and bulldozers to level the construction area and remove underground obstacles within a depth of 2-4 meters, including abandoned pipes, rocks and concrete blocks. Classify and stack the cleared waste and dispose of it. Compact the site with a vibratory roller to make the foundation density reach 90%-95%, and obtain a cleaned construction site.

[0025] Site leveling and waste disposal are thoroughly implemented. Excavators and bulldozers are used to level the construction area and remove any obstacles within a depth of 2 to 4 meters. During the cleaning process, waste is sorted and piled according to type for easy recycling or appropriate disposal. After the site leveling is completed, the soil is compacted using a vibratory roller to ensure that the density of the foundation reaches 90%-95%. This high standard of density is to ensure the stability and safety of subsequent construction.

[0026] Here, abandoned underground pipes and rocks can be detected to provide data support for the selection of construction parameters.

[0027] In this embodiment, step S2 includes: S201, conduct tests on the cleaned construction site, select an area with similar geological conditions to the construction site of the anti-seepage wall, conduct tests on hole making, wall protection slurry and wall pouring construction technology, optimize slurry ratio, construction equipment parameters and construction process flow according to the test results, record the test data, provide reference for formal construction, and obtain construction process parameters; The construction process is tested and optimized. Areas with geological conditions similar to those of the cut-off wall construction site are selected to conduct test operations of hole making, wall protection slurry and wall pouring. During the test, various data are carefully recorded, and the effects of slurry ratio, construction equipment parameters and process flow are analyzed, and adjustments and optimizations are made accordingly. After completing these tests, the construction process parameters obtained will be directly applied to the formal construction to ensure construction quality and efficiency.

[0028] S202, adjusting the construction process parameters, determining the mud ratio according to the test results, adjusting the equipment parameters, optimizing the construction process, and obtaining the optimized construction parameters; The adjustment of construction process parameters ensured the smooth progress of the project. According to the test results, the proportion of mud was accurately adjusted to ensure that the mud could effectively stabilize the soil and support the wall in actual construction. At the same time, according to the site conditions and equipment performance, the equipment parameters were adjusted to meet the construction requirements of different depths and soil types. In addition, the construction process was optimized based on the field test data to simplify the operation steps and improve the construction efficiency. This series of adjustments ultimately formed a set of optimized construction parameters, which not only ensured the construction quality, but also greatly improved the predictability and controllability of the project progress.

[0029] S203, core wall axis layout. Under the guidance of the optimized construction parameters, according to the design drawings, the anti-seepage wall axis is set upstream and downstream of the lock chamber. The center line and edge line of the core wall are accurately laid out using a total station and theodolite. The axis deviation is controlled within ±5-10mm. Obvious signs are set up to ensure the accuracy of the position during the construction process, and the core wall axis is completed.

[0030] The accurate execution of the core wall axis setting is the key to the quality of the project. According to the optimized construction parameters and design drawings, the axis of the anti-seepage wall is accurately set upstream and downstream of the lock chamber. The center line and edge line of the core wall are accurately measured and set out using a total station and theodolite, and the axis deviation is strictly controlled within ±5-10 mm. Obvious signs are set up at key locations to ensure that all work can be carried out accurately in accordance with the design requirements during the construction process. The completion of this step provides a solid foundation for subsequent construction activities, ensuring the accuracy of the structural position and the safety of the overall project.

[0031] In this embodiment, step S3 includes: S301, excavate a guide ditch at the axis position of the core wall after the layout is completed. Use an excavator to excavate a guide ditch with a depth of 1.2-1.5 meters and a width of 0.8-1.0 meters along the axis position of the core wall, remove debris in the ditch, ensure that the bottom is flat, and cast trapezoidal reinforced concrete guide walls on both sides. The height of the guide wall is 1.2-1.5 meters, the top is 0.1-0.2 meters higher than the construction site, and the net distance between the inner and outer guide walls is 65-70 centimeters, so as to obtain a completed guide wall; The excavation of the guide ditch and the construction of the guide wall are the preliminary physical work of the construction. Along the precisely laid out core wall axis, an excavator is used to excavate a guide ditch of specified size, with a depth of 1.2-1.5 meters and a width of 0.8-1.0 meters. Ensure that there is no debris in the ditch and the bottom is flat. Subsequently, trapezoidal reinforced concrete guide walls are cast on both sides, with a height matching the depth of the guide ditch, the top of which is 0.1-0.2 meters above the construction site, and the net distance between the inner and outer guide walls is maintained at 65-70 cm. After this step is completed, a solid guide wall is formed, which provides accurate guidance and physical support for the subsequent core wall construction, ensuring construction safety and structural stability.

[0032] S302, check and adjust the completed guide wall, measure the plane position of the guide wall, and control the deviation within ±10mm; check the verticality of the guide wall, and the deviation shall not exceed 0.5%; detect the height difference of the upper surface of the guide wall, and the height difference of a single piece shall be less than 5mm, and the height difference within the entire length shall be less than 10mm. The parts that do not meet the requirements shall be trimmed to ensure that the quality of the guide wall meets the construction requirements and obtain a qualified guide wall; The completed guide wall is strictly inspected for quality and necessary adjustments are made. First, the plane position of the guide wall is measured to control the deviation within ±10 mm. The verticality of the guide wall is checked to ensure that the deviation does not exceed 0.5%. At the same time, the height difference of the upper surface of the guide wall is detected to ensure that the height difference of a single piece is less than 5 mm and the height difference of the entire length is less than 10 mm. Parts that do not meet the requirements are carefully trimmed to ensure that the overall quality of the guide wall meets the construction standards. The completion of this step ensures the structural integrity and functionality of the guide wall, providing a solid guarantee for the smooth progress of the core wall construction.

[0033] S303, a mud pool system is arranged on both sides of the qualified guide wall. According to the construction plan, a mud pool is set up upstream of the gate area, including a slurry storage pool, a sedimentation pool and a recovery pool. The capacity of the mud pool meets the needs of continuous construction. A mud conveying pipeline is laid, using a pipeline with a diameter of 70-90 mm and a three-way valve to facilitate the transportation and recovery of mud, thus obtaining a complete mud circulation system.

[0034] Arrange the mud pool system and realize the mud circulation function. According to the construction plan, set up a slurry storage tank, a sedimentation tank and a recovery tank upstream of the gate area to ensure that the capacity of the mud pool system can meet the needs of continuous construction. Lay a mud delivery pipeline with a diameter of 70-90 mm, and install three-way valves at key nodes to facilitate the transportation and recovery of mud. This arrangement allows the mud to be recycled at the construction site, effectively reducing material costs and reducing environmental impact. The establishment and optimization of the mud circulation system ensures the stability and safety of the wall protection during the construction process, creating favorable conditions for subsequent construction steps.

[0035] The S4 step includes: S401, prepare construction equipment. According to the construction plan, mobilize hydraulic grabs, dump trucks, drilling rigs, excavators, crawler cranes, concrete grouting racks, conduits, mud preparation systems, mud pumps and loaders. Check the performance parameters of the equipment to ensure that the equipment is in good condition. Conduct technical briefings and safety training for operators to obtain the prepared construction equipment. Prepare and inspect construction equipment. Mobilize key equipment including hydraulic grabs, dump trucks, drilling rigs, excavators, crawler cranes, concrete grouting racks, conduits, mud preparation systems, mud pumps and loaders. Check the performance parameters of each equipment in detail to ensure that all equipment is in good condition. Conduct technical briefings and safety training for operators to ensure that every employee can correctly understand the operating methods and safety regulations. The thorough implementation of this process not only improves construction efficiency, but also greatly ensures the safety of the construction site.

[0036] S402, preparation of wall protection mud, in a perfect mud circulation system, using secondary bentonite as the slurry material, adding water and dispersant, stirring evenly according to the proportion, making new mud, the mud expansion time is not less than 24 hours, and the wall protection mud that meets the requirements is obtained, the mud density is less than 1.10g / cm³, the viscosity is 30-90 seconds, and the sand content is less than 2%; The preparation of the wall protection mud is a key link. Secondary bentonite is used as the main slurry material in the mud circulation system, and an appropriate amount of water and dispersant are added. Stirring is carried out according to a scientific ratio to ensure that the mud is mixed evenly, and the swelling time is controlled to be no less than 24 hours. This process ensures that the mud has good viscosity and stability, meeting the requirements for wall protection during construction. The prepared wall protection mud not only enhances the stability of the trench wall during construction, but also effectively prevents soil erosion and ensures the construction quality.

[0037] S403, injecting the wall protection slurry that meets the requirements into the trench section. When excavating the trench section, use a hydraulic grab to dig a trench between the guide walls, and inject the wall protection slurry into the trench at the same time, keeping the slurry liquid level 0.5-1.0 meters higher than the groundwater level to prevent the trench wall from collapsing, controlling the trenching speed and the verticality of the grab, ensuring that the shape and size of the trench section meet the requirements, and the excavation depth reaches the design requirements, so as to obtain the excavated trench section; The injection of the retaining wall slurry and the excavation of the trench sections are carried out simultaneously. A hydraulic grab is used to accurately dig trenches between the guide walls, and the prepared retaining wall slurry is injected into the trenches at the same time. The slurry level is kept 0.5-1.0 meters above the groundwater level to effectively prevent the trench wall from collapsing. By controlling the excavation speed and the verticality of the grab, the shape and size of each trench section are ensured to strictly meet the design requirements. The delicate operation of this step ensures the accuracy of the construction and the stability of the structure, providing a solid foundation for the subsequent concrete pouring.

[0038] S404, inspect the excavated trench section, use a hammer and inclinometer to measure the plane position, depth and verticality of the trench section. The plane position deviation of the trench section shall not exceed ±30mm, the trench bottom depth shall meet the design requirements, the trench wall verticality deviation shall be less than 0.3%, the trench bottom shall be cleaned to ensure that the sediment thickness is less than 100mm, the mud performance indicators shall meet the casting requirements, and the trench section shall be accepted.

[0039] S5, pour concrete in the qualified trench section, use the method of concrete under the conduit, the diameter of the conduit is 200-300 mm, the bottom of the conduit is 30-50 cm from the bottom of the trench, the concrete mix ratio meets the design requirements, the slump is 200-240 mm, the expansion is 340-400 mm, continuous pouring, control the depth of the conduit buried in the concrete to be 1-6 meters, ensure that the concrete surface rises evenly, and the speed is not less than 2 meters / hour to obtain a cast anti-seepage wall.

[0040] S6. Perform quality inspection on the cast anti-seepage wall. Drill an inspection hole with a diameter of 91 mm on the axis of the wall. The depth is the same as that of the anti-seepage wall. Take core samples to test the strength and density of the concrete. Perform a penetration test on the wall to check its anti-seepage performance. The permeability coefficient should be less than 1×10⁻ 7 cm / s. For the parts that do not meet the requirements, reinforcement measures such as grouting treatment are taken to ensure the overall quality of the anti-seepage wall and obtain a qualified anti-seepage wall.

[0041] In this embodiment, in step S202, the density of the mud is controlled at 1.05-1.15 g / cm³, the viscosity is 30-90 seconds, and the sand content is less than 2%.

[0042] In this embodiment, in step S202, the equipment parameters are adjusted specifically as follows: the lifting speed of the grab bucket is adjusted to 1-2 m / min, and the pulling force of the winch is adjusted to 150-200 kN.

[0043] In this embodiment, in step S402, the dispersant is Na2CO3 with a ratio of water: bentonite: Na2CO3 = 100: (5-8): (0-0.3).

[0044] In this embodiment, in step S303, the capacity of the slurry storage tank is 50-100 cubic meters.

[0045] The above are only preferred embodiments of the present invention and are not intended to limit the present invention in other forms. Any technician familiar with the profession may use the technical contents disclosed above to change or modify them into equivalent embodiments with equivalent changes and apply them to other fields. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A construction process for an anti-seepage wall, characterized in that: The following steps are involved: S1, geological survey and site preparation, using drilling equipment and geological radar to survey the geological conditions, analyze the soil layers at each depth, determine the stratum structure, soil properties and groundwater level; detect underground obstacles such as abandoned pipes and rocks, and provide data support for the selection of construction parameters; then, based on the survey results, use excavators and bulldozers to clear obstacles within a depth of 2-4 meters on the ground, and level and compact the site to ensure that the foundation density reaches 90%-95%, creating good conditions for construction; S2, test and construction preparation, on the cleaned and leveled site, select an area with similar geological conditions to the construction site for construction process tests, including hole making, wall protection mud and wall pouring, to optimize the mud ratio and construction equipment parameters; then adjust the mud ratio and equipment parameters according to the test results to optimize the construction process; use a total station and theodolite to lay out the core wall axis on the construction site; S3, guide wall construction and mud system layout, use excavators to dig guide trenches along the predetermined core wall axis, and cast trapezoidal reinforced concrete guide walls to ensure that the guide wall structure meets the design requirements and quality standards; then arrange a complete mud pool system upstream of the sluice area, including slurry storage tanks, sedimentation tanks and recovery tanks, and lay transportation pipelines to ensure the continuity and efficiency of mud circulation; S4: Construction execution and acceptance, mobilizing the required construction equipment and providing technical and safety training to operators; preparing the required wall protection slurry and excavating the trench section with the support of the protective slurry to ensure that the trench wall is stable and the shape meets the design; then inspecting the completed trench section, including the verticality, plane position and sedimentation thickness of the trench section.

2. The anti-seepage wall construction process according to claim 1, characterized in that: The S1 step includes: S101, geological survey, geological survey within the scope of the project, use drilling equipment to sample and analyze the soil layer at each depth, determine the geological structure, stratum distribution, soil properties and groundwater level information, use radar and metal detectors to find out the underground obstacles at the anti-seepage wall, including abandoned pipes, rocks and concrete blocks, and organize the survey results into a report to provide a basis for selecting construction parameters and obtain a geological survey report; S102, analyzing the geological survey report, determining the location and nature of underground obstacles based on the data in the report, using excavators and bulldozers to remove underground obstacles within a depth of 2-4 meters from the ground, including abandoned pipes, rocks and concrete blocks, selecting a slurry circulation process based on soil quality and hydrological conditions, with the length of each trench section being 10-20 meters, and formulating a construction plan; S103, site cleaning: under the guidance of the construction plan, use excavators and bulldozers to level the construction area, remove underground obstacles within a depth of 2-4 meters, including abandoned pipes, rocks and concrete blocks, sort and stack the cleared waste, and compact the site with a vibratory roller to make the foundation density reach 90%-95%, thereby obtaining a cleaned construction site.

3. The anti-seepage wall construction process according to claim 2, characterized in that: The S2 step includes: S201, conducting tests on the cleaned construction site, selecting an area with similar geological conditions to the construction site of the anti-seepage wall, conducting tests on hole making, wall protection slurry and wall casting construction technology, optimizing slurry ratio, construction equipment parameters and construction process flow according to the test results, recording the test data, providing a reference for formal construction, and obtaining construction process parameters; S202, adjusting the construction process parameters, determining the mud ratio according to the test results, adjusting the equipment parameters, optimizing the construction process, and obtaining optimized construction parameters; S203, stakeout of the core wall axis. Under the guidance of the optimized construction parameters and according to the design drawings, the axis of the anti-seepage wall is set upstream and downstream of the lock chamber. The center line and edge line of the core wall are accurately staked out using a total station and a theodolite. The axis deviation is controlled within ±5-10mm. Obvious marks are set up to ensure the accuracy of the position during the construction process, and the stakeout of the core wall axis is obtained.

4. The anti-seepage wall construction process according to claim 3, characterized in that: The S3 step includes: S301, excavating a guide ditch at the axis position of the core wall where the lofting is completed, using an excavator to excavate a guide ditch with a depth of 1.2-1.5 meters and a width of 0.8-1.0 meters along the axis position of the core wall, removing debris in the ditch, ensuring that the bottom is flat, and casting trapezoidal reinforced concrete guide walls on both sides, with a guide wall height of 1.2-1.5 meters, a top 0.1-0.2 meters higher than the construction site, and a net distance of 65-70 centimeters between the inner and outer guide walls, to obtain a completed guide wall; S302, inspect and adjust the completed guide wall, measure the plane position of the guide wall, and control the deviation within ±10mm; inspect the verticality of the guide wall, and the deviation does not exceed 0.5%; detect the height difference of the upper surface of the guide wall, and the height difference of a single piece is less than 5mm, and the height difference within the entire length is less than 10mm, and trim the parts that do not meet the requirements to ensure that the quality of the guide wall meets the construction requirements and obtain a qualified guide wall; S303, arranging a mud pool system on both sides of the qualified guide wall. According to the construction plan, a mud pool is set up at the upstream of the gate area, including a slurry storage pool, a sedimentation pool and a recovery pool. The capacity of the mud pool meets the needs of continuous construction. A mud delivery pipeline is laid, using a pipeline with a diameter of 70-90 mm, and a three-way valve is set to facilitate the delivery and recovery of mud, so as to obtain a complete mud circulation system; The S4 step includes: S401, prepare construction equipment. According to the construction plan, mobilize hydraulic grabs, dump trucks, drilling rigs, excavators, crawler cranes, concrete grouting racks, conduits, mud preparation systems, mud pumps and loaders, check the performance parameters of the equipment to ensure that the equipment is in good condition, conduct technical briefings and safety training for operators, and obtain the prepared construction equipment; S402, preparation of wall protection mud, in the perfect mud circulation system, using secondary bentonite as the slurry material, adding water and dispersant, stirring evenly according to the proportion, making new mud, the mud swelling time is not less than 24 hours, and the wall protection mud that meets the requirements is obtained, the density of the mud is less than 1.10g / cm³, the viscosity is 30-90 seconds, and the sand content is less than 2%; S403, injecting the wall protection slurry that meets the requirements into the trench section. When excavating the trench section, use a hydraulic grab to dig a trench between the guide walls, and inject the wall protection slurry into the trench at the same time, keeping the slurry liquid level 0.5-1.0 meters higher than the groundwater level to prevent the trench wall from collapsing, controlling the trenching speed and the verticality of the grab, ensuring that the shape and size of the trench section meet the requirements, and the excavation depth reaches the design requirements, so as to obtain the excavated trench section; S404, inspect the excavated trench section, use a plumb bob and inclinometer to measure the plane position, depth and verticality of the trench section, the plane position deviation of the trench section shall not exceed ±30mm, the trench bottom depth shall meet the design requirements, the trench wall verticality deviation shall be less than 0.3%, the trench bottom shall be cleaned to ensure that the sediment thickness is less than 100mm, the mud performance indicators shall meet the casting requirements, and the qualified trench section shall be obtained.

5. The anti-seepage wall construction process according to claim 4, characterized in that: Also includes: S5, pouring concrete in the qualified trough section, using the method of concrete under the conduit, the diameter of the conduit is 200-300 mm, the bottom of the conduit is 30-50 cm away from the bottom of the trough, the concrete mix ratio meets the design requirements, the slump is 200-240 mm, the expansion is 340-400 mm, continuous pouring, controlling the depth of the conduit buried in the concrete to be 1-6 meters, ensuring that the concrete surface rises evenly, and the speed is not less than 2 meters / hour, to obtain a cast anti-seepage wall.

6. The anti-seepage wall construction process according to claim 5, characterized in that: The method also includes: S6, conducting a quality inspection on the cast anti-seepage wall, drilling an inspection hole with a diameter of 91 mm on the axis of the wall and a depth the same as that of the anti-seepage wall, taking cores, inspecting the strength and density of the concrete, and conducting a permeability test on the wall to inspect its anti-seepage performance. The permeability coefficient should be less than 1×10⁻ 7 cm / s. For the parts that do not meet the requirements, reinforcement measures such as grouting treatment are taken to ensure the overall quality of the anti-seepage wall and obtain a qualified anti-seepage wall.

7. The anti-seepage wall construction process according to claim 3, characterized in that: In step S202, the density of the mud is controlled at 1.05-1.15 g / cm³, the viscosity is 30-90 seconds, and the sand content is less than 2%.

8. The anti-seepage wall construction process according to claim 3, characterized in that: In step S202, the adjustment of equipment parameters is specifically to adjust the lifting speed of the grab bucket to 1-2 m / min, and the pulling force of the winch to 150-200 kN.

9. The anti-seepage wall construction process according to claim 4, characterized in that: In step S402, the dispersant is Na2CO3 in a ratio of water: bentonite: Na2CO3 = 100: (5-8): (0-0.3).

10. The anti-seepage wall construction process according to claim 4, characterized in that: In step S303, the slurry storage tank has a capacity of 50-100 cubic meters.

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