Seepage-proofing construction method for concrete parting of overflow channel of sand gravel foundation

Abstract

The invention relates to the technical field of overflow channel pouring construction, and provides a sand gravel foundation overflow channel concrete parting anti-seepage construction method aiming at the problem that a water polyethylene foam plate at a traditional overflow channel parting position cannot be aligned with a water stop copper sheet nose groove, and the sand gravel foundation overflow channel concrete parting anti-seepage construction method comprises the following steps that S1, a steel bar structure is bound on an overflow channel pouring station; s2, a water stop copper sheet is lengthened, the water stop copper sheet is erected on one side of a pouring station of the overflow channel module, and a nose groove of the water stop copper sheet is located at the parting position of the overflow channel module; s3, polyethylene foam plates are erected on the two sides of the top and the bottom of the nose groove of the water stop copper sheet; s4, a side formwork is erected on the periphery of the overflow channel module pouring station so as to define a pouring mold cavity; s5, concrete is poured to form an overflow channel module; and S6, formwork removal, wherein the side formworks on the periphery of the overflow channel module are removed. The device has the effect that the polyethylene foam plate and the nose groove of the water stop steel sheet are kept centered.

Description

Technical Field

[0001] This application relates to the technical field of overflow channel pouring construction, and in particular to a concrete joint seepage prevention construction method for overflow channels on gravel foundations. Background Technology

[0002] Overflow channels are key hydraulic structures in water conservancy and hydropower projects, ensuring the safety of the project. They mainly function to control water levels and discharge floodwaters.

[0003] To reduce cracks caused by concrete shrinkage and subsequent irregular settlement of the foundation, the overflow channel concrete structure is usually divided into several overflow channel modules during the pouring and construction process, with gaps left between adjacent overflow channel modules to achieve joint treatment of the overflow channel structure. To limit leakage at the joints of the overflow channel modules, water-stop copper sheets are usually installed between adjacent overflow channel modules, and polyethylene foam boards are placed on the top and bottom sides of the nose groove of the water-stop copper sheets. The water-stop copper sheets and polyethylene foam boards are used to form a water-stop and seepage-proof structure.

[0004] Currently, in actual construction, the water-stop structure at the joint of the overflow channel is usually constructed by embedding one side of the water-stop copper sheet in the pre-cast module of the overflow channel, with the nose groove of the water-stop copper sheet located at the joint. After the pre-cast module of the overflow channel is completed and the formwork is removed, polyethylene foam boards are then installed at the top and bottom ends of the nose groove of the water-stop copper sheet.

[0005] During actual construction, the polyethylene foam board is prone to misalignment with the nose groove of the water-stop copper sheet due to casting errors in the overflow channel module, affecting the water-stopping effect of the subsequent joint sealing structure. Therefore, there is room for improvement. Summary of the Invention

[0006] To address the issue that the polyethylene foam board at the overflow channel joint cannot be aligned with the nose groove of the water-stop copper sheet, this application provides a method for waterproofing the concrete joints of an overflow channel on a gravel foundation.

[0007] This application provides a method for constructing a concrete joint waterproofing system for overflow channels on gravel foundations, which employs the following technical solution: A method for constructing a concrete joint waterproofing system for overflow channels on gravel foundations includes the following steps: S1: Reinforced steel structure construction: Binding the reinforcing steel structure at the overflow channel pouring station; S2: Waterstop copper sheet installation: The waterstop copper sheet is lengthened and installed on one side of the overflow channel module pouring position, with the waterstop copper sheet nose groove located at the joint of the overflow channel module. S3: Polyethylene foam board installation: Polyethylene foam boards are installed on both sides of the top and bottom of the water-stop copper strip groove. S4: Template erection: Side templates are erected around the perimeter of the overflow channel module pouring station to enclose and form the pouring cavity; S5: Concrete pouring: Pour concrete to form the overflow channel module; S6: Template Removal: Remove the side templates around the overflow channel module.

[0008] By adopting the above technical solution, two polyethylene foam boards are installed on both sides of the top and bottom of the water-stop copper strip groove before pouring the overflow channel module. Compared with the traditional construction method, this helps to ensure that the two polyethylene foam boards are accurately positioned at the water-stop copper strip groove. This effectively avoids the situation where the polyethylene foam boards cannot be aligned with the water-stop copper strip groove due to pouring errors during the concrete pouring process, thus affecting the water-stopping effect of the water-stopping structure.

[0009] Preferably, in step S2, after the water-stop copper sheet is installed, SR plastic filler is filled into the groove of the water-stop copper sheet to form a filler layer.

[0010] By adopting the above technical solution, on the one hand, it is beneficial to fill and seal the nose groove of the water-stop copper sheet by filling the filler layer filled with SR plastic filler, which limits the concrete from entering the nose groove during the subsequent overflow channel concrete pouring process and affecting the normal adaptation and deformation of the nose groove structure of the water-stop copper sheet. On the other hand, the deformation adaptability of the nose groove of the water-stop copper sheet can be improved by utilizing the characteristics of SR plastic filler itself.

[0011] Preferably, in step S3, when installing the polyethylene foam board located above the nose groove of the water-stop copper sheet, the bottom end of the polyethylene foam board is embedded into the nose groove of the water-stop copper sheet and bonded and fixed to the uncured SR plastic filler. When installing the polyethylene foam board located at the bottom of the nose groove of the water-stop copper sheet, a positioning groove adapted to the nose groove of the water-stop copper sheet is opened on the top of the polyethylene foam board, and the positioning groove on the top of the polyethylene foam board is inserted into the bottom of the nose groove of the water-stop copper sheet.

[0012] By adopting the above technical solution, embedding the upper polyethylene foam board into the nose groove and bonding it with the uncured SR plastic filler, it is beneficial to position the polyethylene foam board while further improving the sealing performance between the polyethylene foam board and the nose groove of the water-stop copper sheet. By inserting the positioning groove at the top of the lower polyethylene foam board into the bottom of the nose groove of the water-stop copper sheet, it is beneficial to quickly position the polyethylene foam board so that the polyethylene foam board is more firmly located below the nose groove of the water-stop copper sheet.

[0013] Preferably, in step S2, when installing the water-stop copper sheet, several brackets are welded to the bottom of the wing plate on one side of the water-stop copper sheet, and the bottom of the brackets is fixed to the bottom of the overflow channel module pouring station.

[0014] By adopting the above technical solution, the bracket provides stable support for the water-stop copper sheet, limiting its displacement due to external forces or grout impact during subsequent polyethylene foam board installation, formwork erection, and concrete pouring. This allows the water-stop copper sheet to be installed more precisely at the joints of adjacent overflow channel modules.

[0015] Preferably, in step S3, before installing the polyethylene foam board, several limiting components are installed on the side of the overflow channel module pouring station facing the water-stop copper sheet; the limiting components include vertically arranged support rods, and the support rods are vertically connected to two connecting screws; When installing the limiting component, fix the support rod to the bottom plate of the pouring station of the overflow channel module, and make the two connecting bolts located at the top and bottom of the water-stop copper sheet respectively; When installing polyethylene foam board, make sure that the two connecting bolts are respectively inserted through the polyethylene foam board on both the top and bottom sides of the water-stop copper sheet. In step S4, when setting up the side template, the two connecting bolts are inserted through the opposite side templates; and sealing washers and limiting nuts are fitted into the ends of the connecting bolts. In step S6, when removing the side template, the sealing gasket and the limiting nut are removed from the end of the connecting screw, and the side template is removed; after the side template is removed, the sealing gasket and the limiting nut are reinstalled to the end of the connecting screw to limit the polyethylene foam board.

[0016] By adopting the above technical solution, and by inserting the connecting bolts into the corresponding polyethylene foam boards, on the one hand, the connecting bolts can longitudinally limit the polyethylene foam boards, which helps to make the polyethylene foam boards more securely located at the nose groove of the water-stop copper sheet. On the other hand, after the side formwork is installed, the sealing washer installed at the end of the connecting bolt and the limiting nut can be used to tie and fix the side formwork, preventing the side formwork from shifting due to the pressure of concrete pouring. At the same time, after the side formwork is removed, the limiting nut and the sealing washer can be used to limit and fix the corresponding polyethylene foam boards, preventing the polyethylene foam boards from detaching from the poured overflow channel due to external force.

[0017] Preferably, an annular limiting plate is sleeved on the outer periphery of each connecting screw; In step S3, when installing the polyethylene foam board, the polyethylene foam board is brought into contact with the annular limiting plate.

[0018] By adopting the above technical solution, the annular limiting plate horizontally limits the corresponding polyethylene foam board, which helps to more stably support the polyethylene foam board on both sides of the top and bottom of the water-stop copper strip groove. Simultaneously, it helps to prevent the polyethylene foam board from shifting due to external loads during subsequent installation of the side formwork. Furthermore, after the overflow channel is poured, the annular limiting plate can form a water-stop structure between the connecting screw and the overflow channel, preventing external moisture from entering the overflow channel through the gap between the connecting screw and the overflow channel.

[0019] Preferably, the support rod is connected to a threaded sleeve corresponding to the connecting screw; the connecting screw is threaded into the corresponding threaded sleeve. In step S3, when installing the polyethylene foam board, after the connecting screw passes through the polyethylene foam board, rotate the connecting screw so that the annular limiting plate abuts against the corresponding polyethylene foam board.

[0020] By adopting the above technical solution, the polyethylene foam board is installed at the lug of the water-stop copper sheet, and the connecting screw is inserted into the corresponding polyethylene foam board. By rotating the connecting screw, the annular limiting plate on the connecting screw can be made to fit against the polyethylene foam board. This reduces the situation where the annular limiting plate cannot fit against the polyethylene foam board due to installation errors of the limiting component, thus affecting the limiting effect of the limiting component on the polyethylene foam board.

[0021] Preferably, the side template is formed with a receiving groove corresponding to the water-stop copper sheet, and the receiving groove is used for the water-stop copper sheet wing plate to extend into; In step S4, when the side template is supported on the side of the overflow channel module where the water-stop copper sheet is supported, the wing plate of the water-stop copper sheet extending out of the overflow channel module is embedded into the receiving groove of the side template.

[0022] By adopting the above technical solution, on the one hand, it is beneficial to avoid the situation where the protruding wing plate interferes with the normal installation of the side formwork. On the other hand, the receiving groove of the side formwork can be used to form a wrap-around protection for the wing plate protruding from the water-stop copper sheet, so as to avoid the wing plate being displaced or deformed due to external impact during the concrete pouring process, which would affect the water-stopping performance of the water-stop copper sheet.

[0023] Preferably, in step S5, when pouring concrete, the specific steps are as follows: S5.1: Initial concrete pouring: After pouring the concrete to the bottom of the waterstop copper wing plate, the concrete is vibrated. S5.2: Secondary concrete pouring: Pour concrete again until the overflow channel module reaches the design elevation; vibrate the concrete.

[0024] By adopting the above technical solution, after the concrete is poured to the bottom of the water-stop copper sheet, vibration is carried out first, which helps the air bubbles in the concrete at the bottom of the water-stop copper sheet wing plate to be smoothly discharged along the wing plate. This effectively avoids the accumulation of air bubbles at the bottom of the wing plate when the concrete is poured at one time, which would prevent them from being discharged and forming pores. This also helps to prevent air bubbles from being trapped at the bottom of the wing plate and forming pores. Preferably, in step S2, when the water-stop copper sheet is spliced, the adjacent ends of the adjacent water-stop copper sheets are overlapped, and the overlap of the adjacent water-stop copper sheets is double-sided welded.

[0025] By adopting the above technical solution, and by overlapping and welding adjacent water-stop copper sheets on both sides, it is beneficial to ensure the welding strength and sealing of the joint between adjacent water-stop copper sheets, and to avoid leakage at the joint due to poor welding, which would affect the water-stopping effect of the subsequent water-stopping structure.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. By installing polyethylene foam boards on both sides of the top and bottom of the water-stop copper strip's nose groove before pouring the overflow channel module, it is beneficial to ensure that the polyethylene foam boards are accurately positioned at the nose groove of the water-stop copper strip. This avoids the situation where the polyethylene foam boards cannot be aligned with the nose groove of the water-stop copper strip due to concrete pouring errors, thus affecting the water-stopping effect of the water-stopping structure.

[0027] 2. By embedding the bottom of the polyethylene foam board above the water-stop copper sheet into the nose groove and bonding it with the uncured SR plastic filler during installation, precise positioning of the polyethylene foam board can be achieved. On the other hand, the SR plastic filler can be used to limit and fix the polyethylene foam board while further sealing the gap between the polyethylene foam board and the nose groove of the water-stop copper sheet, thus preventing concrete from entering the nose groove of the water-stop copper sheet during subsequent pouring.

[0028] 3. By installing limiting components corresponding to the polyethylene foam board at the overflow channel pouring station, when installing the polyethylene foam board, the connecting screw of the limiting component can be inserted through the polyethylene foam board, and the polyethylene foam board can be made to abut against the annular limiting plate on the corresponding connecting screw. The connecting screw and the annular limiting plate are used to limit the polyethylene foam board. At the same time, when installing the side template, the sealing gasket installed later can be used to connect and fix the side template with the limiting nut and the connecting screw, thus limiting the displacement of the side template. Attached Figure Description

[0029] Figure 1 This is a schematic diagram used in this application to illustrate the state of the support for the water-stop copper sheet.

[0030] Figure 2 This is a partial schematic diagram used in this application to illustrate the connection between adjacent water-stop copper sheets.

[0031] Figure 3 This is a partial schematic diagram used in this application to illustrate the limiting member.

[0032] Figure 4 This is a schematic diagram used in this application to illustrate the state of installation of polyethylene foam boards.

[0033] Figure 5 yes Figure 4 Enlarged schematic diagram of part A in the middle.

[0034] Figure 6 This is a schematic diagram used in this application to illustrate the state of the side formwork.

[0035] Figure 7 yes Figure 6 An enlarged schematic diagram of part B in the diagram.

[0036] Figure 8 This is a schematic diagram used in this application to illustrate the state after the side formwork has been removed.

[0037] Explanation of reference numerals in the attached figures: 1. Reinforced steel structure; 2. Water-stop copper sheet; 20. Nose groove; 21. Limiting component; 211. Support rod; 212. Fixing plate; 214. Threaded sleeve; 213. Connecting screw; 215. Annular limiting plate; 216. Sealing washer; 217. Limiting nut; 22. Bracket; 3. Polyethylene foam board; 30. Filler layer; 4. Side template; 40. Receiving groove; 41. Limiting sleeve. Detailed Implementation

[0038] The following is in conjunction with the appendix Figure 1-8 This application will be described in further detail.

[0039] This application discloses a method for constructing a concrete joint waterproofing system for overflow channels in gravel foundations, including the following steps: S1: Construction of reinforced concrete structure 1: Refer to Figure 1 , 1. Tie the steel reinforcement structure at the overflow channel pouring station.

[0040] During the binding process, control points are first marked at the pouring position of the overflow channel using measuring instruments. Reinforcing steel structure 1 is then laid out according to the drawings, with all steel bars being HRB400. The reinforcing bars are tied in a staggered pattern using binding wire. Precast concrete blocks are used as pads for reinforcing steel structure 1, and the frame is reinforced with welding to ensure stability. Reinforcing bar joints are located at points of lower stress in the overflow channel components, and double-sided welds are used at the joints.

[0041] S2: Installation of water-stop copper sheet 2: Install water-stop copper sheet 2 on one side of the overflow channel module pouring position, and make the nose groove 20 of water-stop copper sheet 2 located at the joint of the overflow channel structure.

[0042] The specific steps of step S2 are as follows: S2.1: Forming and processing of water-stop copper sheet 2: The water-stop copper sheet 2 is pressed and formed using a water-stop sheet forming machine.

[0043] S2.2: Extension of water-stop copper sheet 2: Refer to Figure 1 and Figure 2 The adjacent ends of the adjacent water-stop copper sheets 2 are overlapped, and the overlap of the adjacent water-stop copper sheets 2 is welded on both sides to ensure the sealing and structural strength of the connection between the adjacent water-stop copper sheets 2.

[0044] S2.3: Weld several brackets 22 to the bottom of one side wing plate of the water-stop copper sheet 2.

[0045] S2.4: Using a total station, move the water-stop copper sheet 2 to the installation position, ensuring that the groove 20 of the water-stop copper sheet 2 coincides with the center of the joint of the overflow channel module; fix the bottom of the bracket 22 to the base plate of the overflow channel module pouring station using expansion bolts. Use the bracket 22 to support and limit the water-stop copper sheet 2, preventing it from shifting due to external loads.

[0046] S3: Installation of polyethylene foam board 3: Polyethylene foam board 3 is installed on both sides of the top and bottom of the water-stop copper plate 2 groove 20.

[0047] Reference Figure 3 and Figure 4 The specific steps of step S3 are as follows: S3.1: On the side of the overflow channel module pouring station facing the water-stop copper sheet 2, several limiting parts 21 are supported along the water-stop copper sheet 2.

[0048] The limiting component 21 includes a vertically arranged support rod 211, with a fixing plate 212 vertically welded to the bottom end of the support rod 211; two threaded sleeves 214 are vertically welded to the support rod 211, and connecting screws 213 are coaxially threaded inside the threaded sleeves 214, with annular limiting plates 215 coaxially welded to each connecting screw 213. The specific steps are as follows: S3.1.1: Move the limiting member 21 to the overflow channel module pouring position, so that the two connecting screws 213 are located at the top and bottom of the water-stop copper sheet 2 respectively, and make the end of the connecting screw 213 away from the support rod 211 extend out of the overflow channel module pouring position.

[0049] S3.1.2: Fix the fixing plate 212 to the base plate of the overflow channel module pouring station using expansion bolts.

[0050] S3.2: Reference Figure 4 and Figure 5 SR plastic filler is filled into the nose groove 20 of the water-stop copper sheet 2 to form a filler layer 30.

[0051] S3.3: A perforation is made in the polyethylene foam board 3 for the connecting screw 213 to pass through.

[0052] S3.4: Reference Figure 3 and Figure 5 Upper polyethylene foam board 3 installation: S3.4.1: Insert the bottom end of the upper polyethylene foam board 3 into the groove 20 of the water-stop copper sheet 2 and bond it to the uncured filler layer 30; at the same time, make the connecting screw 213 of the limiting member 21 pass through the perforation into the polyethylene foam board 3. S3.4.2: Rotate the connecting screw 213 so that the annular limiting plate 215 on the connecting screw 213 abuts against the polyethylene foam board 3; so as to support and limit the polyethylene foam board 3 through the annular limiting plate 215.

[0053] S3.5: Reference Figure 3 and Figure 5 Installation of lower polyethylene foam board 3: S3.5.1: A positioning groove adapted to the nose groove 20 of the water-stop copper sheet 2 is opened at the top of the lower polyethylene foam board 3. S3.5.2: Insert the positioning groove at the top of the lower polyethylene foam board 3 into the bottom of the nose groove 20 of the water-stop copper sheet 2; at the same time, make the connecting screw 213 of the limiting member 21 pass through the through hole into the polyethylene foam board 3. S3.5.3: Rotate the connecting screw 213 so that the annular limiting plate 215 on the connecting screw 213 abuts against the polyethylene foam board 3; so as to support and limit the polyethylene foam board 3 through the annular limiting plate 215.

[0054] The upper polyethylene foam board 3 is positioned using the groove-shaped inner cavity of the nose groove 20, and the upper polyethylene foam board 3 is bonded and fixed using the filler layer 30 to seal the gap between the polyethylene foam board 3 and the nose groove 20, thereby limiting the subsequent pouring of concrete from seeping into the nose groove 20 and affecting the structural failure of the nose groove 20. At the same time, the nose groove 20 can be reinforced by the filling SR plastic filler, while improving the deformation adaptability of the water-stop copper sheet 2 nose groove 20 structure.

[0055] The lower polyethylene foam board 3 is positioned by using the positioning groove and the nose groove 20 to ensure that the lower polyethylene foam board 3 is accurately located at the bottom of the nose groove 20 of the water-stop copper sheet 2.

[0056] The polyethylene foam board 3 is supported and limited by the connecting screw 213 and the annular limiting plate 215, so that the polyethylene foam board 3 can be more stably aligned with the nose groove 20 of the water-stop copper sheet 2.

[0057] S4: Template Setup: Refer to Figure 6 and Figure 7Side formwork 4 is set up around the overflow channel module pouring station to enclose and form the pouring cavity of the overflow channel module.

[0058] The side template 4 at the overflow channel joint has a receiving groove 40 for embedding the water-stop wing plate in the corresponding water-stop copper sheet 2; the side template 4 at the overflow channel joint has a through hole for the connecting screw 213 to pass through.

[0059] Reference Figure 6 and Figure 7 The specific steps of step S4 are as follows: S4.1: Side formwork 4 without receiving groove 40 is installed on the side of the spillway module except for the joint side; S4.2: Move the side template 4 with the receiving groove 40 to the joint of the overflow module, so that the side template 4 abuts against the polyethylene foam board 3 located above and below the nose groove 20 of the water-stop copper sheet 2, and embed the wing plate of the water-stop copper sheet 2 into the receiving groove 40 of the side template 4; at the same time, let the connecting screw 213 pass through the through hole into the side template 4. S4.3: Insert the sealing washer 216 and the limiting nut 217 into the end of the connecting screw 213. Tighten the limiting nut 217 so that the sealing washer 216 abuts against the outside of the side formwork 4. The connecting screw 213, together with the sealing washer 216 and the limiting nut 217, supports and limits the side formwork 4 to prevent it from expanding and shifting due to the subsequent pouring of concrete.

[0060] S4.4: Insert several limiting sleeves 41 on the outside of the pouring position of the overflow channel module, and make the limiting sleeves 41 abut against the outer periphery of the side formwork 4, so as to fix the side formwork 4 by using the limiting sleeves 41.

[0061] S5: Concrete Pouring: Pouring concrete to form the overflow channel module; the specific steps are as follows. S5.1: Initial concrete pouring: After pouring the concrete to the bottom of the wing plate of the waterstop copper sheet 2, the concrete is vibrated to eliminate air bubbles in the concrete slurry at the bottom of the waterstop copper sheet 2.

[0062] S5.2: Secondary concrete pouring: Pour concrete again until the overflow channel module reaches the design elevation; vibrate the concrete.

[0063] When vibrating the concrete slurry near the water-stop copper sheet 2 and the polyethylene foam board 3, a small flexible shaft vibrator should be used to compact it; and the water-stop copper sheet 2 and the polyethylene foam board 3 should not come into contact during the vibration process.

[0064] S6: Formwork Removal: Refer to... Figures 6 to 8 Remove the side formwork 4 around the overflow channel module. The specific steps are as follows: S6.1: Remove the limiting sleeve 41 located outside the side template 4.

[0065] S6.2: Remove the side formwork 4 without the receiving groove 40.

[0066] S6.3: Removal of side template 4 with receiving groove 40: Remove the limiting nut 217 and sealing gasket at the end of the connecting screw 213; remove the side template 4 with receiving groove 40.

[0067] S6.4: Reinstall the sealing washer 216 and the limiting nut 217 to the end of the connecting screw 213, and rotate the limiting nut 217 so that the connecting screw 213, together with the limiting nut 217 and the sealing washer 216, limits the polyethylene foam board 3, preventing the polyethylene foam board 3 from falling off due to external force during subsequent construction.

[0068] Before pouring the overflow channel post-pouring module, remove the limit nut 217 and sealing washer 216, and cut off the connecting screw 213 extending out of the outer end of the polyethylene foam board 3.

[0069] In this embodiment, before pouring the overflow channel concrete, the polyethylene foam board 3 is securely supported on the top and bottom of the water-stop copper sheet 2 groove 20 with the limiting member 21 and the water-stop copper sheet 2 groove 20, and then the overflow channel concrete is poured. This effectively ensures that the polyethylene foam board 3 and the water-stop copper sheet 2 groove 20 are aligned, avoiding the situation where the polyethylene foam board 3 cannot be aligned with the water-stop copper sheet 2 groove 20 during installation due to concrete pouring errors.

[0070] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A method for constructing a concrete joint waterproofing system for overflow channels on gravel foundations, characterized in that: Includes the following steps: S1: Reinforced steel structure (1) construction: tie the reinforced steel structure (1) at the overflow channel pouring position; S2: Installation of water-stop copper sheet (2): The water-stop copper sheet (2) is lengthened and installed on one side of the overflow channel module pouring position, and the nose groove (20) of the water-stop copper sheet (2) is located at the joint of the overflow channel module. S3: Installation of polyethylene foam board (3): Polyethylene foam board (3) is installed on both sides of the top and bottom of the nose groove (20) of the water-stop copper sheet (2); S4: Template support: Side templates (4) are set up around the pouring station of the overflow channel module to enclose and form the pouring cavity; S5: Concrete pouring: Pour concrete to form the overflow channel module; S6: Template Removal: Remove the side templates (4) around the overflow channel module.

2. The method for concrete joint seepage prevention construction of overflow channel in gravel foundation according to claim 1, characterized in that: In step S2, after the water-stop copper sheet (2) is installed, SR plastic filler is filled into the nose groove (20) of the water-stop copper sheet (2) to form a filler layer (30).

3. The method for concrete joint seepage prevention construction of overflow channel in gravel foundation according to claim 2, characterized in that: In step S3, when installing the polyethylene foam board (3) located above the nose groove (20) of the water-stop copper sheet (2), the bottom end of the polyethylene foam board (3) is embedded into the nose groove (20) of the water-stop copper sheet (2) and it is bonded and fixed to the uncured SR plastic filler. When installing the polyethylene foam board (3) located at the bottom of the nose groove (20) of the water-stop copper sheet (2), a positioning groove that matches the nose groove (20) of the water-stop copper sheet (2) is opened on the top of the polyethylene foam board (3), and the positioning groove on the top of the polyethylene foam board (3) is inserted into the bottom of the nose groove (20) of the water-stop copper sheet (2).

4. The method for concrete joint seepage prevention construction of overflow channel in gravel foundation according to claim 1, characterized in that: In step S2, when installing the water-stop copper sheet (2), several brackets (22) are welded to the bottom of the wing plate on one side of the water-stop copper sheet (2), and the bottom of the brackets (22) is fixed to the bottom of the overflow channel module pouring station.

5. The method for concrete joint seepage prevention construction of overflow channel in gravel foundation according to claim 3, characterized in that: In step S3, before installing the polyethylene foam board (3), several limiting members (21) are set up on the side of the overflow channel module pouring station facing the water-stop copper sheet (2); the limiting member (21) includes a vertically set support rod (211), and the support rod (211) is vertically connected to two connecting screws (213). When installing the limiting component (21), fix the support rod (211) to the bottom plate of the pouring station of the overflow channel module, and make the two connecting screws (213) located at the top and bottom of the water-stop copper sheet (2) respectively; When installing polyethylene foam board (3), the two connecting screws (213) are respectively inserted into the polyethylene foam board (3) on the top and bottom sides of the water-stop copper sheet (2); In step S4, when setting up the side template (4), the two connecting screws (213) are inserted through the opposite side template (4); and a sealing washer (216) and a limiting nut (217) are fitted into the end of the connecting screw (213); In step S6, when removing the side template (4), the sealing gasket (216) and the limiting nut (217) are removed from the end of the connecting screw (213), and the side template (4) is removed; after the side template (4) is removed, the sealing gasket (216) and the limiting nut (217) are reinstalled to the end of the connecting screw (213) to limit the polyethylene foam board (3).

6. The method for concrete joint seepage prevention construction of overflow channel in gravel foundation according to claim 5, characterized in that: The connecting screw (213) is sleeved with an annular limiting plate (215) on its outer periphery; In step S3, when installing the polyethylene foam board (3), the polyethylene foam board (3) is brought into contact with the annular limiting plate (215).

7. The method for concrete joint seepage prevention construction of overflow channel in gravel foundation according to claim 6, characterized in that: The support rod (211) is connected to the threaded sleeve (214) corresponding to the connecting screw (213); the connecting screw (213) is threaded into the corresponding threaded sleeve (214); In step S3, when installing the polyethylene foam board (3), after the connecting screw (213) is inserted through the polyethylene foam board (3), the connecting screw (213) is rotated so that the annular limiting plate (215) abuts against the corresponding polyethylene foam board (3).

8. The method for concrete joint seepage prevention construction of overflow channel in gravel foundation according to claim 1, characterized in that: The side template (4) is formed with a receiving groove (40) corresponding to the water-stop copper sheet (2), and the receiving groove (40) is used for the wing plate of the water-stop copper sheet (2) to extend into; In step S4, when the side template (4) is supported on the side of the overflow channel module where the water-stop copper sheet (2) is supported, the wing plate of the water-stop copper sheet (2) extending out of the overflow channel module is embedded into the receiving groove (40) of the side template (4).

9. The method for concrete joint seepage prevention construction of overflow channel in gravel foundation according to claim 1, characterized in that: In step S5, when pouring concrete, the specific steps are as follows: S5.1: Initial concrete pouring: After pouring the concrete to the bottom of the waterstop copper sheet (2) wing plate, the concrete is vibrated. S5.2: Secondary concrete pouring: Pour concrete again until the overflow channel module reaches the design elevation; vibrate the concrete.

10. The method for concrete joint seepage prevention construction of overflow channel in gravel foundation according to claim 1, characterized in that: In step S2, when the water-stop copper sheet (2) is lengthened, the adjacent ends of the water-stop copper sheets (2) are overlapped, and the overlap of the adjacent water-stop copper sheets (2) is double-sided welded.

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