Basement post-cast strip leakage water treatment construction process

Abstract

The application discloses a construction process for basement post-cast strip water leakage treatment, and belongs to the technical field of building construction, which comprises the following steps: after the bottom plate or wall body steel bar binding is completed, a pre-buried steel plate is first installed along the horizontal direction at the post-cast strip position, the pre-buried steel plate is arranged in the middle along the length direction of the post-cast strip, is fixed through additional steel bars and structure main reinforcement, and is hinged to a rotating shaft, and the outer side of the rotating shaft is simultaneously hinged with a vertical steel plate and a horizontal steel net; then, temporary formworks are installed on the two sides of the pre-buried steel plate, the rotating shaft is kept on the outer side of the temporary formworks, and both sides of concrete are poured; after the initial setting of the both sides of concrete, a turnover assembly is installed between the vertical steel plate and the side wall of the cast-in-place concrete, the positions of the vertical steel plate and the horizontal steel net are adjusted to keep them in the vertical and horizontal states respectively; and then, the pouring of the post-cast strip concrete is carried out. By adopting the process, the cavity problem existing under the water stop steel plate can be effectively prevented, and the water resistance and durability of the building structure are improved.

Description

Technical Field

[0001] This invention belongs to the field of building construction technology, specifically relating to a construction process for treating water leakage in post-cast strips of basements. Background Technology

[0002] Currently, in basement construction, post-cast strips, as a key structural measure to overcome concrete shrinkage deformation and regulate uneven structural settlement, have been widely used in various large and ultra-long underground projects. The conventional construction process typically involves pre-embedding a waterstop steel plate at the location of the post-cast strip as the first layer of waterproofing after the reinforcement of the base slab or walls is completed. Concrete is then poured on both sides, and the post-cast strip is sealed after the main structure's settlement has stabilized or shrinkage deformation has largely subsided. However, in actual projects, due to objective factors such as aggregate settling during concrete pouring, water accumulation, or the difficulty of the vibrator effectively reaching confined spaces, localized voids occur at the horizontal construction joint below the waterstop steel plate. For hidden cavities caused by insufficient vibration under the water-stop steel plate, the current engineering practice usually adopts the remedial method of drilling at an angle and injecting chemical grout or cement-based grouting material. This conventional angled grouting method has many inherent limitations in actual operation. The grouting direction is often difficult to match with the direction of seepage pressure. Under the action of gravity, the grout tends to flow down along the gap and cannot be effectively stationed at the target cavity location, resulting in a high degree of randomness and uncertainty in the filling effect, which seriously affects the normal use function and structural durability of the basement. Summary of the Invention

[0003] In view of this, the purpose of this invention is to provide a construction process for treating water leakage in post-cast strips of basements, which can effectively prevent the problem of voids under the waterstop steel plate and improve the waterproofing and durability of the building structure.

[0004] To achieve the above objectives, the present invention provides the following technical solution: This invention discloses a construction process for treating water leakage in post-cast strips of basements, comprising the following steps: After the reinforcement of the base slab or wall is tied, a pre-embedded steel plate is first installed horizontally at the post-cast strip location. The pre-embedded steel plate is centrally positioned along the entire length of the post-cast strip and fixed to the main structural reinforcement by additional reinforcement. The pre-embedded steel plate is hinged to a pivot, and a vertical steel plate and a horizontal steel mesh are simultaneously hinged to the outside of the pivot. Subsequently, temporary formwork is installed on both sides of the pre-embedded steel plate, keeping the pivot outside the temporary formwork, and concrete is poured on both sides. After the initial setting of the concrete on both sides, a tilting assembly is installed between the vertical steel plate and the side wall of the cast-in-place concrete to adjust the vertical steel plate and the water... The steel mesh is positioned to maintain both vertical and horizontal states. Subsequently, the concrete for the post-cast strip is poured. During the pouring process, after the grout rises and contacts the plane of the horizontal steel mesh, the flipping component controls the vertical steel plate to flip and contact the horizontal steel mesh. The vertical steel plate and the pre-embedded steel plate combine to form the first water-stop steel plate to stop the seepage path. After the concrete for the post-cast strip has initially set, several sets of drill holes are arranged at intervals along the length of both sides. Grouting pipes are installed in the drill holes, and underwater non-dispersible inorganic grout is injected into the crushed stone layer at the bottom of the base plate through the grouting pipes. After the grout has solidified, all exposed pipe ends that protrude above the base plate surface are cut off, the holes are sealed, and the surface is ground smooth.

[0005] Furthermore, before pouring the post-cast concrete, the horizontal steel mesh and the embedded steel plate are connected to the rotating shaft through the first rotating cylinder and the fixed cylinder, respectively. The vertical steel plate is connected to the rotating shaft through the second rotating cylinder. The side of the first rotating cylinder is equipped with a sensor plate, and the side of the fixed cylinder is equipped with a first proximity switch and a second proximity switch corresponding to the sensor plate along the circumference. The flipping assembly includes a liquid bladder filled with glue. The liquid bladder is connected to a hydraulic pump. After the slurry rises and contacts the plane of the horizontal steel mesh, the horizontal steel mesh is deflected by buoyancy. The second proximity switch receives the signal from the sensor plate, and the hydraulic pump starts to fill the liquid bladder. At the same time, the liquid bladder drives the vertical steel plate to flip and contact the horizontal steel mesh. After receiving the signal, the first proximity switch disconnects the hydraulic pump from the delivery pipe.

[0006] Furthermore, foam columns are fixed to the side of the horizontal steel mesh adjacent to the rotating shaft. Under the action of buoyancy, the slurry can drive the horizontal steel mesh to deflect through the foam columns.

[0007] Furthermore, the upper surface of the horizontal steel mesh is equipped with barbed needles, and the vertical steel plate has a strip groove. When the liquid bladder drives the vertical steel plate to flip and contact the horizontal steel mesh, the barbed needles can pass through the strip groove and puncture the liquid bladder.

[0008] Furthermore, before the concrete of the post-cast strip is poured, a groove is reserved on the side wall of the concrete on both sides. The groove is located on the lower side of the embedded steel plate. The second water-stop steel plate is slidably installed in the groove in the horizontal direction. The second water-stop steel plate is basically set in the groove. The second water-stop steel plate and the vertical steel plate are connected by a connecting rod. The two ends of the connecting rod are respectively hinged to the second water-stop steel plate and the vertical steel plate. When the vertical steel plate is flipped to contact the horizontal steel mesh, the connecting rod can simultaneously pull part of the second water-stop steel plate out of the groove. The second water-stop steel plate is set parallel to the lower side of the first water-stop steel plate. The recesses of the first water-stop steel plate and the second water-stop steel plate are both facing downward.

[0009] Furthermore, the process for forming the groove is as follows: A detachable filler block with a rectangular cross-section is pre-tied or welded. The width of the filler block is adapted to the width of the second waterstop steel plate. The length of the filler block is continuously arranged along the entire length of the post-pouring strip, ensuring that it is close to the inner wall of the temporary template and located directly below the lower edge of the first waterstop steel plate. When the concrete on both sides is poured and vibrated, the concrete slurry wraps around the filler block. After the initial setting of the first-pouring concrete, the construction personnel pull one end of the filler block, which is reserved outside the area of ​​the first-pouring strip, to pull the filler block out of the concrete side wall, thereby forming a reserved groove on the side wall of the first-pouring concrete with the same size as the filler block.

[0010] Furthermore, the grouting pressure when injecting underwater non-dispersible inorganic grout is 0.2 to 0.4 MPa. After all boreholes are grouted, the pressure is maintained for 5 to 10 minutes, and finally left to cure for 12 hours.

[0011] The beneficial effects of this invention are as follows: This invention discloses a construction process for treating water leakage in post-cast strips of basements. Before the concrete is poured into the post-cast strip, the vertical steel plate remains vertical, thus not affecting the grouting process. Only after the grout below is filled is the vertical steel plate restored to a horizontal position by the flipping component, forming a complete first water-stop steel plate. Since the vertical steel plate is flipped only after the grout below is filled, the formation of voids below is avoided. Using the construction process of this invention can effectively prevent the problem of voids below the water-stop steel plate, improving the waterproofing and durability of the building structure. Attached Figure Description

[0012] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the following figures are provided for illustration: Figure 1 This is a schematic diagram before the construction of the post-cast strip concrete. Figure 2 This is a schematic diagram showing the concrete pouring process after the post-pouring strip is completed. Figure 3 This is a diagram showing the combination variations of the first water-stop steel plate; Figure 4This is a schematic diagram of a vertical steel plate structure. Figure 5 for Figure 4 Enlarged view of point A in the middle.

[0013] The following are the markings in the attached diagram: 1. Concrete on both sides; 2. Concrete in the post-cast strip; 3. Embedded steel plate; 4. Rotating shaft; 5. Vertical steel plate; 6. Horizontal steel mesh; 7. Grouting pipe; 8. First rotating cylinder; 9. Fixed cylinder; 10. Induction plate; 11. First proximity switch; 12. Second proximity switch; 13. Liquid bladder; 14. Foam column; 15. Needle; 16. Strip groove; 17. Groove opening; 18. Second water-stop steel plate; 19. Connecting rod; 20. Second rotating cylinder. Detailed Implementation

[0014] like Figures 1-5 As shown, the present invention discloses a construction process for treating water leakage in the post-cast strip of a basement, comprising the following steps: After the reinforcement of the base slab or wall is tied, a pre-embedded steel plate 3 is first installed horizontally at the post-cast strip location. Multiple sets of pre-embedded steel plates 3 can be arranged longitudinally. The recess of the pre-embedded steel plate 3 is located on the inner side of the concrete 1 on both sides. The pre-embedded steel plate 3 is arranged centrally along the length of the post-cast strip and is fixed to the main reinforcement of the structure by additional reinforcement. Among them, the pre-embedded steel plate 3 is hinged to a rotating shaft 4. The length direction of the rotating shaft 4 is along the length direction of the post-cast strip. A vertical steel plate 5 and a horizontal steel mesh 6 are simultaneously hinged to the outer side of the rotating shaft 4. The vertical steel plate 5 and the horizontal steel mesh 6 are arranged vertically and horizontally, respectively.

[0015] Subsequently, temporary templates are installed on both sides of the embedded steel plate 3. The temporary templates are used for pouring concrete 1 on both sides. During pouring, the rotating shaft 4 is kept outside the temporary template before pouring concrete 1 on both sides to avoid contact with the rotating shaft 4. After the concrete 1 on both sides has initially set, a flipping component is installed between the vertical steel plate 5 and the side wall of the cast-in-place concrete. The positions of the vertical steel plate 5 and the horizontal steel mesh 6 are adjusted to keep them vertical and horizontal, respectively. The concrete 2 of the post-pouring strip is poured. During the pouring process, after the grout rises and contacts the plane of the horizontal steel mesh 6, the flipping component controls the vertical steel plate 5 to flip and contact the horizontal steel mesh 6. The vertical steel plate 5 and the embedded steel plate 3 are combined to form the first water-stop steel plate for stopping the seepage path.

[0016] Before the post-cast concrete 2 is poured, the vertical steel plate 5 remains vertical, thus not affecting the grouting process. Only after the grout below is filled is the vertical steel plate 5 restored to a horizontal position by the flipping component, forming a complete first water-stop steel plate. Since the vertical steel plate 5 is flipped after the grout below is filled, the formation of voids below is avoided. After the post-cast concrete 2 has initially set, several sets of drill holes are arranged at intervals along the length of its two sides. Grouting pipes 7 are installed in the drill holes, and underwater non-dispersible inorganic grout is injected into the crushed stone layer at the bottom of the base plate through the grouting pipes 7. After the grout has solidified, all exposed pipe ends that protrude above the base plate surface are cut off, the holes are sealed, and the surface is ground smooth.

[0017] In traditional construction, fixed waterstop steel plates block the upward path of concrete grout, resulting in closed cavities on the underside that are difficult to vibrate. This invention, however, initially sets the vertical steel plate 5 vertically, allowing the grout to rise freely and fully fill the bottom space during the pouring of the post-cast concrete 2. Only after the grout rises and contacts the horizontal steel mesh 6 does the flipping component drive the vertical steel plate 5 to flip to the horizontal, forming a complete first waterstop steel plate together with the pre-embedded steel plate 3. This timing control method ensures that the grout on the lower side is filled before the waterstop structure closes, fundamentally preventing the formation of voids, significantly improving the impermeability and structural durability of the post-cast strip, and reducing the engineering costs of later repairs and reinforcements.

[0018] In this embodiment, before pouring the post-cast concrete 2, the horizontal steel mesh 6 and the embedded steel plate 3 are connected to the rotating shaft 4 via the first rotating cylinder 8 and the fixed cylinder 9, respectively. The vertical steel plate 5 is connected to the rotating shaft 4 via the second rotating cylinder 20. A sensing element 10 is installed on the side of the first rotating cylinder 8, and a first proximity switch 11 and a second proximity switch 12 corresponding to the sensing element 10 are respectively arranged circumferentially on the side of the fixed cylinder 9. The flipping assembly includes a liquid bladder 13, which is filled with glue. The glue can fill the cracks in the concrete and improve the concrete strength. The liquid bladder 13 is connected to a hydraulic pump. After the slurry rises and contacts the plane of the horizontal steel mesh 6, the horizontal steel mesh 6 is deflected by buoyancy. The second proximity switch 12 receives the signal from the sensing element 10 and transmits the signal to the controller. The controller controls the hydraulic pump to start and fill the liquid bladder 13 with liquid. At the same time, the liquid bladder 13 drives the vertical steel plate 5 to flip and contact the horizontal steel mesh 6. After receiving the signal, the first proximity switch 11 disconnects the hydraulic pump from the delivery pipe. The hydraulic pump can be used in subsequent cycles.

[0019] Using the above method, when the slurry rises to the height of the horizontal steel mesh 6, buoyancy drives the horizontal steel mesh 6 to deflect. After the second proximity switch 12 senses the signal, it automatically starts the hydraulic pump to fill the liquid bladder 13. The expansion of the liquid bladder 13 drives the vertical steel plate 5 to complete the flipping. The first proximity switch 11 is used to confirm that the flipping is in place and disconnect the hydraulic pump connection, ensuring the accuracy of the flipping timing. At the same time, the glue filled in the liquid bladder 13 can be released after the liquid bladder 13 is punctured, which can improve the strength of the internal concrete.

[0020] In this embodiment, a foam column 14 is fixed to the side of the horizontal steel mesh 6 adjacent to the rotating shaft 4. Under the action of buoyancy, the slurry can drive the horizontal steel mesh 6 to deflect through the foam column 14. The additional buoyancy generated by the foam column 14 can reliably drive the horizontal steel mesh 6 to deflect around the rotating shaft 4. Even if the concrete slurry has a large consistency or a slow rising speed, the foam column 14 can still provide sufficient and stable buoyancy torque to ensure that the sensing element 10 can reach the detection area of ​​the second proximity switch 12 in a timely manner.

[0021] In this embodiment, a barbed needle 15 is installed on the upper surface of the horizontal steel mesh 6, and a strip groove 16 is provided on the vertical steel plate 5. When the liquid bladder 13 drives the vertical steel plate 5 to flip and contact the horizontal steel mesh 6, the barbed needle 15 can pass through the strip groove 16 and puncture the liquid bladder 13. The design of the strip groove 16 ensures that the barbed needle 15 can pass through smoothly, and avoids rigid interference between the vertical steel plate 5 and the barbed needle 15, which would hinder the flipping. After the liquid bladder 13 is punctured, the internal adhesive penetrates downward along the mesh of the horizontal steel mesh 6 under the action of gravity and capillary action, and can be distributed at the interface between the post-cast concrete 2 and the concrete on both sides 1, avoiding the formation of voids and improving the bonding strength between the old and new concrete.

[0022] In this embodiment, before the concrete 2 of the post-cast strip is poured, a groove 17 is reserved on the side wall of the concrete 1 on both sides. The groove 17 is located on the lower side of the embedded steel plate 3. The second water-stop steel plate 18 is slidably installed in the groove 17 in the horizontal direction. The second water-stop steel plate 18 is basically set in the groove 17. The second water-stop steel plate 18 and the vertical steel plate 5 are connected by a connecting rod 19. The two ends of the connecting rod 19 are respectively hinged to the second water-stop steel plate 18 and the vertical steel plate 5. When the vertical steel plate 5 is flipped to contact the horizontal steel mesh 6, the connecting rod 19 can simultaneously pull part of the second water-stop steel plate 18 out of the groove 17. The second water-stop steel plate 18 is arranged parallel to the lower side of the first water-stop steel plate. The recesses of the first water-stop steel plate and the second water-stop steel plate 18 are both facing downward. The two water-stop steel plates are arranged in a staggered vertical position, which prolongs the tortuousness of the seepage path. Even if the first water-stop steel plate fails locally due to construction defects or long-term corrosion, the second water-stop steel plate can still independently play its role in intercepting water, thereby significantly improving the long-term service life of the post-cast strip area. Since the second water-stop steel plate 18 is pulled out horizontally later, the formation of voids is also avoided.

[0023] In this embodiment, the process of forming the slot 17 is as follows: A detachable filler block with a rectangular cross-section is pre-tied or welded. The width of the filler block is adapted to the width of the second waterstop steel plate 18, and the length of the filler block is continuously arranged along the length of the post-pouring strip, ensuring that it is tightly attached to the inner wall of the temporary template and located directly below the lower edge of the first waterstop steel plate. When the concrete 1 on both sides is poured and vibrated, the concrete slurry wraps around the filler block. After the initial setting of the first-pouring concrete, the construction personnel pull one end of the filler block, which is reserved outside the area of ​​the first-pouring strip, to pull the filler block out of the concrete side wall, thereby forming a reserved slot 17 with the same size as the filler block on the side wall of the first-pouring concrete. The above method has the advantages of simple construction, accurate dimensions, reliable demolding, and no damage to the structure of the concrete 1 on both sides.

[0024] In this embodiment, the grouting pressure when injecting underwater non-dispersible inorganic grout is 0.2-0.4 MPa, which ensures that the grout can fully diffuse and penetrate within the gravel layer. After all boreholes are grouted, the pressure is maintained for 5-10 minutes to ensure that the filling density of the grout within the gravel layer reaches its maximum. Finally, the grout is left to cure for 12 hours, providing sufficient time for hydration and hardening. This allows the grout to reach its initial strength before the pipe ends are cut off and the holes are sealed and ground, further improving the waterproofing level and durability of the post-cast strip area in the basement.

Claims

1. A construction technique for treating water leakage in post-cast strips of basements, characterized in that, Includes the following steps: After the reinforcement of the base slab or wall is tied, a pre-embedded steel plate is first installed horizontally at the post-pouring strip location. The pre-embedded steel plate is centered along the entire length of the post-pouring strip and is fixed to the main structural reinforcement by additional reinforcement. The pre-embedded steel plate is hinged to a pivot, and a vertical steel plate and a horizontal steel mesh are simultaneously hinged to the outside of the pivot. Subsequently, temporary formwork is installed on both sides of the pre-embedded steel plate, keeping the pivot outside the temporary formwork, and concrete is poured on both sides. After the concrete on both sides has initially set, a tilting assembly is installed between the vertical steel plate and the side walls of the cast-in-place concrete to adjust the positions of the vertical steel plate and the horizontal steel mesh to keep them vertical and horizontal, respectively. The surface is in a flat state; subsequently, the concrete for the post-cast strip is poured. During the pouring process, after the grout rises and contacts the plane of the horizontal steel mesh, the flipping component controls the vertical steel plate to flip until it contacts the horizontal steel mesh. The vertical steel plate and the pre-embedded steel plate combine to form the first water-stop steel plate to stop the water seepage path. After the post-cast strip concrete has initially set, several sets of drill holes are arranged at intervals along the length direction on both sides of its edge. Grouting pipes are installed in the drill holes, and underwater non-dispersible inorganic grout is injected into the crushed stone layer at the bottom of the base plate through the grouting pipes. After the grout has solidified, all exposed pipe ends that are higher than the base plate surface are cut off, the holes are sealed, and the surface is ground flat.

2. The construction process for treating water leakage in post-cast strips of basements according to claim 1, characterized in that, Before pouring the post-cast concrete, the horizontal steel mesh and the embedded steel plate are connected to the rotating shaft through the first rotating cylinder and the fixed cylinder, respectively. The vertical steel plate is connected to the rotating shaft through the second rotating cylinder. The side of the first rotating cylinder is equipped with a sensor plate, and the side of the fixed cylinder is equipped with a first proximity switch and a second proximity switch corresponding to the sensor plate along the circumference. The flipping assembly includes a liquid bladder filled with glue. The liquid bladder is connected to a hydraulic pump. After the slurry rises and contacts the plane of the horizontal steel mesh, the horizontal steel mesh is deflected by buoyancy. The second proximity switch receives the signal from the sensor plate, and the hydraulic pump starts to fill the liquid bladder. At the same time, the liquid bladder drives the vertical steel plate to flip and contact the horizontal steel mesh. After receiving the signal, the first proximity switch disconnects the hydraulic pump from the delivery pipe.

3. The construction process for treating water leakage in post-cast strips of basements according to claim 2, characterized in that, Foam columns are fixed to the side of the horizontal steel mesh adjacent to the rotating shaft. Under the action of buoyancy, the slurry can drive the horizontal steel mesh to deflect through the foam columns.

4. The construction process for treating water leakage in post-cast strips of basements according to claim 3, characterized in that, The upper surface of the horizontal steel mesh is equipped with barbed needles, and the vertical steel plate has a strip groove. When the liquid bladder drives the vertical steel plate to flip and contact the horizontal steel mesh, the barbed needles can pass through the strip groove and puncture the liquid bladder.

5. The construction process for treating water leakage in post-cast strips of basements according to claim 4, characterized in that, Before pouring the post-cast concrete, a groove is reserved on the side wall of the concrete on both sides. The groove is located below the embedded steel plate. The second water-stop steel plate is slidably installed in the groove in the horizontal direction. The second water-stop steel plate is basically set in the groove. The second water-stop steel plate and the vertical steel plate are connected by a connecting rod. The two ends of the connecting rod are respectively hinged to the second water-stop steel plate and the vertical steel plate. When the vertical steel plate flips to contact the horizontal steel mesh, the connecting rod can simultaneously pull part of the second water-stop steel plate out of the groove. The second water-stop steel plate is set parallel to the bottom of the first water-stop steel plate. The recesses of the first water-stop steel plate and the second water-stop steel plate are both facing downward.

6. The construction process for treating water leakage in post-cast strips of basements according to claim 5, characterized in that, The process of forming the groove is as follows: A detachable filler block with a rectangular cross-section is pre-tied or welded. The width of the filler block is adapted to the width of the second waterstop steel plate. The length of the filler block is continuously arranged along the entire length of the post-pouring strip to ensure that it is close to the inner wall of the temporary template and located directly below the lower edge of the first waterstop steel plate. When the concrete on both sides is poured and vibrated, the concrete slurry wraps around the filler block. After the initial concrete has set, the construction personnel pull one end of the filler block, which is reserved outside the area of ​​the pre-pouring strip, to pull the filler block out of the concrete side wall, thereby forming a reserved groove on the side wall of the pre-pouring concrete with the same size as the filler block.

7. A construction technique for treating water leakage in post-cast strips of basements according to any one of claims 1-6, characterized in that, The grouting pressure when injecting underwater non-dispersible inorganic grout is 0.2-0.4 MPa. After all boreholes are grouted, the pressure is maintained for 5-10 minutes, and finally left to cure for 12 hours.

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