Precise fixing and anti-seepage method of cast-in-place utility tunnel deformation joint waterstop

Abstract

The application discloses a cast-in-place comprehensive pipe gallery deformation joint water stop belt precision fixing and anti-seepage method and belongs to the technical field of building construction. A pair of welded steel mesh is matched with an H-shaped steel connecting piece to form an integrated limiting system, and the steel mesh, the H-shaped connecting piece, foam plate cutting, bilateral mesh clamping water stop belt binding and shaping and layered pouring and vibrating construction are sequentially completed; the H-shaped connecting piece synchronously restricts the foam plate and the water stop belt water stop ring at multiple points, and the double steel meshes provide rigid support. The method can offset the displacement tendency caused by the lateral pressure and vibration of concrete, guarantee the straightness of the deformation joint, and eliminate the through water seepage channel; components rely on conventional steel field processing, are simple and convenient to operate, have lower construction cost, have good durability of the shaped components, and can long-term guarantee the anti-seepage performance and appearance forming quality of the pipe gallery deformation joint.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, specifically a method for precise fixing and seepage prevention of expansion joint waterstops in cast-in-place integrated pipe corridors. Background Technology

[0002] Reinforced concrete structures such as cast-in-place integrated utility tunnels and stormwater / sewage ditches require longitudinal expansion joints at intervals according to design requirements. These expansion joints must be simultaneously fitted with polyethylene foam filling boards and embedded rubber waterstops to accommodate structural expansion and contraction and prevent seepage. Currently, conventional on-site construction relies solely on the friction generated by the polyethylene foam boards clamping the central waterstop ring of the rubber waterstop for temporary bonding and fixation. However, polyethylene foam filling boards are flexible and lightweight, lacking rigid support. Lateral compressive stress generated during concrete pouring and continuous vibration from vibrating tools exert sustained stress on the foam boards, easily causing overall displacement and partial detachment from the waterstop's center. This results in twisted and uneven expansion joint lines, damaging the appearance of the concrete structure. Furthermore, the resulting through-channels significantly increase the probability of groundwater and other media leakage within the utility tunnel. Therefore, a method for precise fixing and seepage prevention of waterstops in the expansion joints of cast-in-place integrated utility tunnels is proposed. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the present invention aims to provide a precise fixing and seepage prevention method for waterstops in cast-in-place integrated pipe gallery expansion joints, which solves the engineering problems of material misalignment, waterstop center misalignment, deformation joint forming line distortion, and long-term structural leakage during the concrete pouring and vibration stage.

[0004] The technical solution adopted by this invention to solve its technical problem is:

[0005] A method for precise fixing and seepage prevention of expansion joint waterstops in cast-in-place integrated pipe gallery includes the following construction steps:

[0006] S1. Prefabricated paired steel mesh; Select building steel raw materials and form a complete mesh structure through on-site welding process. Each expansion joint is equipped with two sets of independent steel mesh, and the overall outline size of the mesh is adapted to the longitudinal span of the expansion joint of the pipe gallery.

[0007] S2. Prefabricated integrated limiting connectors; H-shaped connectors are formed by bending and welding building steel reinforcement raw materials, and multiple connectors are evenly arranged along the longitudinal direction of a single steel mesh.

[0008] S3. Cut the polyethylene foam-filled board; cut the complete board according to the reserved space size of the expansion joint, and keep the cut surface of the board flat and smooth.

[0009] S4. Single-sided shaping and bonding assembly: The cut polyethylene foam board is tightly bonded to the inner side of the first set of steel mesh. The bottom of the board is placed on the lower transverse section of the H-shaped connector. The foam board and the steel mesh are tied together with metal wire to make the surface of the board flush with the surface of the mesh.

[0010] S5. Waterstop clamping assembly in the center; place the rubber waterstop at the bottom of the H-type connector, and the waterstop ring in the middle of the waterstop is engaged between the lower transverse sections of the H-type connector. Attach the second set of steel mesh to the other side of the waterstop. The two sets of steel mesh form a symmetrical clamping structure through the connector. Use metal wire again to complete the binding and fixing of the entire component.

[0011] S6. Layered controllable concrete pouring: After all the shaping and assembly are completed, the pipe gallery concrete pouring is carried out. The layered material feeding mode is adopted to reduce the lateral impact of the concrete. During the vibration operation, the vibration tool is kept at a safe distance from the steel mesh and foam board. The concrete is vibrated in layers until it is dense inside. After the concrete is cured, the expansion joint seepage prevention is completed.

[0012] Furthermore, the precast steel mesh uses hot-rolled ribbed steel bars, and all intersections of the mesh are formed using a full welding process to ensure the overall structural rigidity of the mesh.

[0013] Furthermore, the upper and lower transverse components of the H-shaped limiting connector are integrally bent and formed, and the upper and lower transverse sections are welded and fixed through the vertical connecting section. The lower transverse section is used to support the water-stop ring in the middle of the rubber waterstop, and the upper transverse section is attached and fixed to the side of the steel mesh.

[0014] Furthermore, after the polyethylene foam board is cut, there are no edge defects or local dents. After the board is attached to the steel mesh, it remains flat and without warping throughout the process.

[0015] Furthermore, multiple H-shaped connectors for each set of steel mesh are arranged at both ends and the middle of the mesh in the longitudinal direction, providing multi-point synchronous restraint of the foam board and waterstop to prevent local displacement.

[0016] Furthermore, during the layered concrete pouring process, the thickness of each pour should be kept uniform. It is forbidden to pile up a large amount of concrete at once and directly impact the shaping and assembly system. The next layer of concrete can only be poured after the vibration operation is completed.

[0017] The present invention, which adopts the above technical solution, has the following prominent features compared with the prior art:

[0018] This invention employs paired steel mesh sheets combined with H-shaped steel connectors to form a bidirectional rigid restraint structure. The steel mesh sheets themselves possess sufficient structural rigidity, providing continuous and stable support for the flexible polyethylene foam board. The connectors simultaneously engage with the central waterstop ring of the rubber waterstop, constraining the filling board and waterstop from multiple points on both sides and in the center. Throughout the concrete pouring process, this effectively counteracts the displacement tendency caused by lateral compression and vibration. After molding, the overall lines of the expansion joint remain straight and regular, significantly optimizing the appearance of the cast-in-place pipe gallery concrete. The filling board and waterstop remain centrally fitted throughout the process without any local detachment, preventing the formation of through-seepage channels. This reduces the risk of leakage at the expansion joint from the construction source, ensuring the long-term waterproof usability of the pipe gallery structure. Yes; the entire process uses only conventional building steel bars, which are welded and bent on-site to complete the processing of standardized components. Material procurement is convenient, and the processing, splicing, and binding operations are simple. On-site construction personnel can quickly master the key points of operation without the need for additional investment in large processing equipment. Compared with traditional temporary fixing processes, it can shorten the on-site standardization and installation time and reduce labor and auxiliary material construction costs. Both the steel bar standardized components and the polyethylene foam filling boards have good environmental adaptability and durability, and can adapt to the humid and temperature-changing environment of underground municipal utility tunnels for a long time. The standardized structure is not easy to rust and deform, and maintains the expansion joint limit and seepage prevention foundation performance for a long time, ensuring the long-term stability of the overall structure of the utility tunnel. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the main structure of an embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the assembly structure of the H-type connector and the foam board in an embodiment of the present invention;

[0021] Explanation of reference numerals in the attached drawings: 1. Waterstop strip; 2. H-type connector; 3. Steel mesh; 4. Foam board. Detailed Implementation

[0022] The present invention will be further illustrated below with reference to specific embodiments. The purpose of this illustration is solely to provide a better understanding of the invention. Therefore, the examples given do not limit the scope of protection of the present invention.

[0023] like Figures 1 to 2 As shown in the figure, this embodiment provides a method for precise fixing and seepage prevention of the waterstop at the expansion joint of a cast-in-place integrated pipe gallery, including the following construction steps:

[0024] The first step is to complete the prefabrication of the steel mesh. Based on the design outline of the expansion joint, hot-rolled ribbed steel bars are selected, and a single complete steel mesh is made using on-site welding. Two sets of symmetrically arranged steel meshes are made for each expansion joint. The overall outline of the mesh is neat and the overall size is adapted to the cross-sectional width of the cast-in-place pipe gallery structure to ensure complete coverage of the expansion joint area during subsequent installation.

[0025] The second step is to process the limiting connector. Select plain round steel bar raw materials, bend and weld them on site to form an H-shaped integrated connector. The lower horizontal section of the connector is adapted to the outline of the middle water-stop ring of the rubber waterstop. The upper vertical section is reserved with a contact surface for bonding and fixing with the steel mesh. A single set of steel mesh is equipped with multiple connectors, which are evenly arranged at both ends and the middle position along the longitudinal direction of the mesh.

[0026] The third step is to cut the polyethylene foam filling board. Cut the complete board according to the design width of the expansion joint. The cut surface of the board after cutting is flat and smooth, and the size matches the reserved space of the expansion joint.

[0027] The fourth step involves assembling the shaping system. The cut polyethylene foam board is tightly fitted to the inner surface of the single-sided steel mesh, ensuring the bottom of the board sits on the lower transverse section of the H-shaped connector. Metal wire is used to secure the foam board and steel mesh, ensuring the board surface and mesh surface are completely flush without any misalignment. A rubber waterstop is placed centered inside the foam board, with the central waterstop ring fully engaged between the lower transverse sections of the H-shaped connectors on both sides. Another set of steel mesh is then fitted to the other side of the waterstop. The two sets of mesh form a symmetrical clamping structure through the connector. Metal wire is used again to complete the overall binding and fixing, thus completing the positioning of the entire shaping component for the expansion joint.

[0028] The fifth step involves layered concrete pouring. After the entire shaping system is installed and tied, the main concrete of the pipe gallery is poured. The entire process adopts a layered material feeding and layered vibration construction mode to reduce the instantaneous lateral impact force generated by the one-time accumulation of concrete. During the vibration operation, the vibrating tools are kept at a safe distance from the steel mesh and foam board to avoid direct impact or puncture of the shaping components. Layered vibration is carried out until the concrete of each layer is dense. After the concrete is completely cured, the formwork is removed to complete the expansion joint seepage prevention molding construction.

[0029] After construction, the quality of the expansion joint was inspected using a straightedge and string line. The expansion joint was straight and without twisting or bending, and the concrete surfaces on both sides were flat without any unevenness or defects. The appearance and seepage prevention performance of the expansion joint met the requirements of the municipal cast-in-place pipe gallery engineering specifications.

[0030] A bidirectional rigid restraint structure is formed by using paired steel mesh sheets with H-shaped steel connectors. The steel mesh sheets themselves have sufficient structural rigidity to provide continuous and stable support for the flexible polyethylene foam board. The connectors simultaneously engage with the central waterstop ring of the rubber waterstop, constraining the filling board and waterstop from multiple points on both sides and in the middle. Throughout the concrete pouring process, this effectively counteracts the displacement tendency caused by lateral compression and vibration. After molding, the overall lines of the expansion joint remain straight and regular, significantly improving the appearance of the cast-in-place pipe gallery concrete. The filling board and waterstop remain centered and adhered throughout the process without any local detachment, preventing the formation of through-seepage channels. This reduces the risk of leakage at the expansion joint from the construction source, ensuring the long-term waterproof usability of the pipe gallery structure. Yes; the entire process uses only conventional building steel bars, which are welded and bent on-site to complete the processing of standardized components. Material procurement is convenient, and the processing, splicing, and binding operations are simple. On-site construction personnel can quickly master the key points of operation without the need for additional investment in large processing equipment. Compared with traditional temporary fixing processes, it can shorten the on-site standardization and installation time and reduce labor and auxiliary material construction costs. Both the steel bar standardized components and the polyethylene foam filling boards have good environmental adaptability and durability, and can adapt to the humid and temperature-changing environment of underground municipal utility tunnels for a long time. The standardized structure is not easy to rust and deform, and maintains the expansion joint limit and seepage prevention foundation performance for a long time, ensuring the long-term stability of the overall structure of the utility tunnel.

[0031] The above description is merely a preferred embodiment of the present invention and does not limit the scope of the present invention. All equivalent changes made based on the description and drawings of the present invention are included within the scope of the present invention.

Claims

1. A method for precise fixing and seepage prevention of waterstops in expansion joints of cast-in-place integrated pipe galleries, characterized in that, The construction steps include the following: S1. Prefabricated paired steel mesh; Select building steel raw materials and form a complete mesh structure through on-site welding process. Each expansion joint is equipped with two sets of independent steel mesh, and the overall outline size of the mesh is adapted to the longitudinal span of the expansion joint of the pipe gallery. S2. Prefabricated integrated limiting connectors; H-shaped connectors are formed by bending and welding building steel reinforcement raw materials, and multiple connectors are evenly arranged along the longitudinal direction of a single steel mesh. S3. Cut the polyethylene foam-filled board; cut the complete board according to the reserved space size of the expansion joint, and keep the cut surface of the board flat and smooth. S4. Single-sided shaping and bonding assembly: The cut polyethylene foam board is tightly bonded to the inner side of the first set of steel mesh. The bottom of the board is placed on the lower transverse section of the H-shaped connector. The foam board and the steel mesh are tied together with metal wire to make the surface of the board flush with the surface of the mesh. S5. Waterstop clamping assembly in the center; place the rubber waterstop at the bottom of the H-type connector, and the waterstop ring in the middle of the waterstop is engaged between the lower transverse sections of the H-type connector. Attach the second set of steel mesh to the other side of the waterstop. The two sets of steel mesh form a symmetrical clamping structure through the connector. Use metal wire again to complete the binding and fixing of the entire component. S6. Layered controllable concrete pouring: After all the shaping and assembly are completed, the pipe gallery concrete pouring is carried out. The layered material feeding mode is adopted to reduce the lateral impact of the concrete. During the vibration operation, the vibration tool is kept at a safe distance from the steel mesh and foam board. The concrete is vibrated in layers until it is dense inside. After the concrete is cured, the expansion joint seepage prevention is completed.

2. The method for precise fixing and seepage prevention of the waterstop at the expansion joint of the cast-in-place integrated pipe gallery according to claim 1, characterized in that: The precast steel mesh uses hot-rolled ribbed steel bars, and all intersections of the mesh are formed by full welding to ensure the overall structural rigidity of the mesh.

3. The method for precise fixing and seepage prevention of the waterstop at the expansion joint of the cast-in-place integrated pipe gallery according to claim 1, characterized in that: The H-type limiting connector has two horizontal components that are bent into one piece. The upper and lower horizontal sections are fixed by welding through the vertical connecting section. The lower horizontal section is used to support the water-stop ring in the middle of the rubber waterstop, and the upper horizontal section is attached and fixed to the side of the steel mesh.

4. The method for precise fixing and seepage prevention of the waterstop at the expansion joint of the cast-in-place integrated pipe gallery according to claim 1, characterized in that: After the polyethylene foam board is cut, there are no edge defects or local dents. After the board is attached to the steel mesh, it remains flat and without warping.

5. The method for precise fixing and seepage prevention of the waterstop at the expansion joint of the cast-in-place integrated pipe gallery according to claim 1, characterized in that: Multiple H-shaped connectors for a single set of steel mesh are arranged at both ends and the middle of the mesh in the longitudinal direction, and the foam board and waterstop are simultaneously restrained at multiple points to prevent local displacement.

6. The method for precise fixing and seepage prevention of the waterstop at the expansion joint of the cast-in-place integrated pipe gallery according to claim 1, characterized in that: During the layered pouring of concrete, the thickness of each pour should be kept uniform. It is forbidden to pile up a large amount of concrete at once and directly impact the shaping and assembly system. The next layer of concrete can only be poured after the vibration operation is completed.

Images