Dismounting-free and anti-seepage post-cast strip side formwork device and construction method thereof

Abstract

The dismounting-free and anti-seepage post-cast strip side formwork device comprises a fish scale-shaped shaping side formwork, a plurality of fish scale-shaped protrusions and reserved penetrating steel bar holes are arranged on the fish scale-shaped shaping side formwork, the fish scale-shaped protrusions are in a quarter sphere shape, the interiors of the fish scale-shaped protrusions are hollow, and upper openings of the fish scale-shaped protrusions are closed; template back notches communicated with the hollow parts are formed in the positions, corresponding to the bulges, of the back parts of the fish scale-shaped shaping side molds; the water stop steel plate is vertically connected with the scaly shaping side mold and is used for forming a water stop barrier at the joint of the post-cast strip; and the rubber sleeve plug is arranged on the reinforcing steel bar penetrating through the reserved hole in a sleeving mode and used for blocking a gap between the reinforcing steel bar and the hole. According to the method, the procedures of formwork dismantling, cleaning, chiseling and the like are omitted in the whole operation, the construction process is simplified, the problem of slurry leakage in the pouring process is fundamentally solved, and cleanliness and quality of the new and old concrete combination face are guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of building construction, and in particular to a dismantling-free and leak-proof post-casting strip side form device and a construction method thereof. Background Art

[0002] In cast-in-place reinforced concrete structures, post-cast strips are often required to prevent harmful cracks caused by concrete shrinkage or uneven settlement. Traditional post-cast strip construction mostly uses wooden formwork, steel formwork or wire mesh as side formwork. These technologies have the following defects: 1. The process is cumbersome and costly: Traditional formwork needs to be installed before pouring the post-cast strip and needs to be removed after pouring. The process is complicated and consumes a lot of manpower. In addition, the formwork turnover rate is low, which increases the project cost. 2. It is easy to leak slurry, affecting the quality: The intersection of the formwork and the structural steel bars and the joints of the formwork are not sealed tightly. When pouring concrete, it is very easy to leak slurry, which pollutes the inside of the post-cast strip, brings great difficulties to the subsequent cleaning, and affects the bonding quality of the new and old concrete. 3. Poor anti-seepage performance and hidden dangers: The post-cast strip is a weak link in the waterproofing of structures such as basements. Improper traditional construction joints are very likely to form leakage channels, and the subsequent maintenance cost is high and difficult. Summary of the Invention

[0003] The purpose of the present invention is to address the deficiencies of the prior art and provide a dismantling-free and leak-proof post-casting strip side form device and a construction method thereof.

[0004] The specific technical solutions are as follows: A disassembly-free and leak-proof post-casting strip side form device, comprising: The fish-scale shaped side formwork is provided with a plurality of fish-scale shaped protrusions and reserved holes for passing through steel bars. The fish-scale shaped protrusions are in the shape of a quarter sphere and are hollow inside and closed at the top. The back of the fish-scale shaped side formwork is provided with a recess on the back of the formwork that is connected to the hollow part at the corresponding protrusions. A water-stop steel plate, vertically connected to the fish-scale shaped side formwork, used to form a water-stop barrier at the joint of the post-cast strip; and The rubber sleeve plug is sleeved on the steel bar passing through the reserved hole and is used for plugging the gap between the steel bar and the hole.

[0005] Optionally, the waterstop steel plate is vertically fixedly connected to the fish-scale shaped side formwork to form a combined side formwork structure.

[0006] Optionally, the waterstop steel plate is provided with reinforcing ribs along its length, or one end thereof extending into the post-cast strip is bent toward the water-facing surface.

[0007] Optionally, the rubber sleeve plug is tightly sleeved on the steel bar and close to the surface of the side form to prevent slurry from leaking from the hole gap during concrete pouring.

[0008] Optionally, the combined side formwork is passed through the reserved holes to penetrate the bottom plate steel mesh and is fixed to the steel mesh by spot welding, thereby maintaining a stable position and preventing displacement during concrete pouring.

[0009] A construction method using the above-mentioned disassembly-free and leak-proof post-casting strip side formwork device comprises the following steps: Step 1: Design the location and size of the reserved steel bar holes of the fish-scale shaped side formwork on the factory-customized mold according to the spacing of the steel bars in the post-cast strip; Step 2: Processing the combined side form in a factory, welding the waterstop steel plate and the fish-scale side form into one, and transporting the combined side form to the construction site; Step 3: Install the combined side formwork at the construction site, with the fish-scale protrusion facing the subsequent concrete pouring direction and the opening of the water-stop steel plate facing the water-facing surface, insert the side formwork into the bottom plate steel mesh through the reserved holes and fix it with spot welding to the steel mesh; Step 4: Use the rubber sleeve to cover the steel bar passing through the hole and close it to the side form to seal the gap between the steel bar and the hole; Step 5: pouring concrete and fully vibrating it. The combined side formwork is kept fixed and does not leak during the vibration process to avoid honeycombing of the concrete. Step 6: After the concrete is poured, it is wet-cured. The fish-scale protrusions increase the bite force of the contact surface between the new and old concrete, and the other side of the post-casting strip can be constructed without roughening the side. Step 7: Use the same method to complete the pouring and curing of concrete on the other side of the post-cast strip; Step 8: After the concrete construction on both sides is completed and the main structure settlement is stable, remove the rubber sleeve and clean the post-casting zone area, tie the post-casting zone steel bars, and after acceptance, pour a higher grade of fine stone micro-expansive concrete and vibrate and maintain.

[0010] Optionally, in step three, the opening direction of the water-stop steel plate is set toward the water-facing surface to improve the waterproof performance of the post-cast strip.

[0011] Optionally, in step six, the fish-scale protrusions allow the new and old concrete to be tightly bonded, and the joints of the post-casting strips can be ensured to be leak-free without roughening.

[0012] Optionally, in step eight, the concrete in the post-cast zone area is poured using fine stone micro-expansive concrete with a strength grade one level higher than that of the original structural concrete, and is vibrated and fully cured in a timely manner after pouring.

[0013] Optionally, the waterstop steel plate forms a physical partition at the joint of the new and old concrete, and cooperates with the rubber sleeve to seal the holes on the side form, together forming a double waterproof line of defense to prevent water penetration and achieve leakage prevention.

[0014] Compared with the prior art, the present invention has the following beneficial effects: As a disassembly-free formwork, this device eliminates the processes of formwork removal, cleaning, and roughening, simplifies the construction process, effectively shortens the construction period by more than 15%, and saves more than 20% of labor costs; the unique fish-scale side formwork forms a tight mechanical bite with the concrete through its interface structure, fundamentally solving the problem of leakage during the pouring process, and ensuring the cleanliness and quality of the interface between new and old concrete; the waterstop steel plate constitutes the main waterproof line of defense, and the rubber sleeve plug blocks potential leakage points. The two work together to form a "surface + point" combined double waterproof system, which significantly improves the anti-leakage performance of the post-cast zone. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of the overall structure of the device of the present invention; Figure 2 This is a schematic diagram of the overall structure of the other side of the device of the present invention; In the figure: 1. Waterstop steel plate; 2. Fish-scale shaped side formwork; 3. Steel bars; 21. Fish-scale protrusions; 22. Notch on the back of the formwork; 31. Rubber sleeve plug. DETAILED DESCRIPTION

[0016] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0017] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0019] The present invention provides a dismantling-free and leak-proof post-casting strip side mold device, referring to Figure 1-Figure 2 ,include: The fish-scale side formwork is provided with a number of fish-scale protrusions and holes reserved for passing steel bars. The fish-scale protrusions are in the shape of a quarter sphere, hollow inside, and closed at the top. The back of the fish-scale side formwork is provided with a recess on the back of the formwork that is connected to the hollow space at the corresponding position of the protrusions. The recess is shaped like half a cylinder and is connected to the hollow fish-scale protrusions. Waterstop steel plates, vertically connected to the fish-scale side formwork, are used to form waterstop barriers at the joints of the post-cast strips; and The rubber sleeve plug is put on the steel bar passing through the reserved hole to block the gap between the steel bar and the hole.

[0020] Specifically, the fish-scale side formwork is made of 0.8mm-thick Q235 hot-dip galvanized steel sheet. It includes a fish-scale formwork and two side wing panels. The side formwork is generally 400mm high, and the wing panels are 170mm long on each side. The side formwork primarily serves as a support and provides good adhesion to the concrete. The wing panels primarily prevent water leakage from the post-cast strip. 20mm-diameter holes are opened on the upper and lower sides of the wing panels to allow the base plate to pass through the post-cast strip and reinforce the steel bars. The holes are spaced 10mm apart. The waterstop steel plate is 3mm thick and 300mm wide. It is firmly connected to the fish-scale side formwork through continuous welding, forming a combined side formwork structure. After installation, the centerline of the waterstop steel plate coincides with the centerline of the post-cast strip, and each side extends 150mm into the new and old concrete. The rubber sleeve plug is made of EPDM rubber and is conical in shape. The diameter of the large end is 25mm, which is slightly larger than the 22mm diameter of the reserved hole. It is used to tightly plug the reserved hole with an interference fit before pouring the post-casting strip to achieve reliable sealing.

[0021] The construction method of the present invention is as follows Figure 1-2 The specific steps are as follows: Step 1: Based on the spacing of the post-cast strip reinforcement, design the location and size of the reserved reinforcement holes for the fish-scale shaped side formwork on the factory-customized mold. The hole diameter is generally 20mm. Step 2: Process the combined side formwork in the factory, weld the waterstop steel plate and the fish-scale side formwork into one, and transport the combined side formwork to the construction site; Step 3: Install the combined side formwork at the construction site, with the fish-scale protrusion facing the subsequent concrete pouring direction and the opening of the water-stop steel plate facing the water-facing surface. After the direction of the combined side formwork is adjusted, the on-site operator inserts the side formwork into the bottom plate steel mesh through the reserved holes and spot welds it to the steel mesh; Step 4: After the combined side form reaches the preset position, use a rubber sleeve to cover the steel bars passing through the hole and press it against the side form to seal the gap between the steel bars and the hole, preventing the slurry from flowing out of the gap during the concrete pouring process; Step 5: Due to the vertical design of the combined side form and its firm fixation in the bottom plate steel mesh, it is firmly fixed and not easily displaced. On-site operators pour concrete and fully vibrate it. The combined side form remains fixed and leaks no slurry during the vibration process, thus avoiding honeycombing of the concrete surface. Step 6: After the concrete is poured, it is wet-cured. The fish-scale protrusions increase the contact area of ​​the new and old concrete and increase the bite force of the contact surface of the new and old concrete. This makes it possible to pour concrete on the other side of the post-casting strip without roughening the concrete side. At the same time, since the new and old concrete are more tightly combined, no water leakage will occur. Step 7: Use the same method to complete the pouring and curing of concrete on the other side of the post-cast strip; Step 8: After the concrete construction on both sides is completed and the main structure settlement is stable, remove the rubber sleeve and clean the post-casting zone, tie the post-casting zone steel bars, and after acceptance, pour a higher grade of fine stone micro-expansive concrete and vibrate and maintain.

[0022] In step three, the opening direction of the water-stop steel plate is set toward the water-facing surface to improve the waterproof performance of the post-cast strip.

[0023] In step six, the fish-scale-like protrusions make the new and old concrete tightly bonded, and the joints of the post-casting strips can be ensured to be leak-free without the need for roughening.

[0024] In step eight, the concrete in the post-cast zone area is poured with fine stone micro-expansive concrete that is one level higher in strength grade than the original structural concrete, and is vibrated and fully cured in a timely manner after pouring.

[0025] The waterstop steel plate forms a physical partition at the joints of new and old concrete, and works together with the rubber sleeve to seal the holes on the side formwork, together forming a double waterproof line of defense to prevent water infiltration and achieve leakage prevention.

[0026] The above are only preferred embodiments of the present invention and do not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A dismantling-free and leak-proof post-casting strip side form device, characterized in that: include: The fish-scale shaped side formwork is provided with a plurality of fish-scale shaped protrusions and reserved holes for passing through steel bars. The fish-scale shaped protrusions are in the shape of a quarter sphere and are hollow inside and closed at the top. The back of the fish-scale shaped side formwork is provided with a recess on the back of the formwork that is connected to the hollow part at the corresponding protrusions. A water-stop steel plate is vertically connected to the fish-scale shaped side formwork and is used to form a water-stop barrier at the joint of the post-cast strip; as well as The rubber sleeve plug is sleeved on the steel bar passing through the reserved hole and is used for plugging the gap between the steel bar and the hole.

2. The dismantling-free and leak-proof post-casting strip side form device according to claim 1 is characterized in that: The water-stop steel plate is vertically fixedly connected to the fish-scale shaped side formwork to form a combined side formwork structure.

3. The dismantling-free and leak-proof post-casting strip side form device according to claim 1 is characterized in that: The water-stop steel plate is provided with reinforcing ribs along its length direction, or one end thereof extending into the post-cast strip is bent toward the water-facing surface.

4. The disassembly-free and leak-proof post-casting strip side form device according to claim 1 is characterized in that: The rubber sleeve plug is tightly sleeved on the steel bar and adheres closely to the surface of the side formwork to prevent slurry from leaking from the hole gap when pouring concrete.

5. The dismantling-free and leak-proof post-casting strip side form device according to claim 2 is characterized in that: The combined side formwork is passed through the reserved holes to penetrate the bottom plate steel mesh and is fixed to the steel mesh by spot welding, thereby maintaining a stable position and preventing displacement during concrete pouring.

6. A construction method for the dismantling-free and leak-proof post-casting strip side formwork device according to any one of claims 1 to 5, characterized in that: The following steps are involved: Step 1: Design the location and size of the reserved steel bar holes of the fish-scale shaped side formwork on the factory-customized mold according to the spacing of the steel bars in the post-cast strip; Step 2: Processing the combined side form in a factory, welding the waterstop steel plate and the fish-scale side form into one, and transporting the combined side form to the construction site; Step 3: Install the combined side formwork at the construction site, with the fish-scale protrusion facing the subsequent concrete pouring direction and the opening of the water-stop steel plate facing the water-facing surface, insert the side formwork into the bottom plate steel mesh through the reserved holes and fix it with spot welding to the steel mesh; Step 4: Use the rubber sleeve to cover the steel bar passing through the hole and close it to the side form to seal the gap between the steel bar and the hole; Step 5: pouring concrete and fully vibrating it. The combined side formwork is kept fixed and does not leak during the vibration process to avoid honeycombing of the concrete. Step 6: After the concrete is poured, it is wet-cured. The fish-scale protrusions increase the bite force of the contact surface between the new and old concrete, and the other side of the post-casting strip can be constructed without roughening the side. Step 7: Use the same method to complete the pouring and curing of concrete on the other side of the post-cast strip; Step 8: After the concrete construction on both sides is completed and the main structure settlement is stable, remove the rubber sleeve and clean the post-casting zone area, tie the post-casting zone steel bars, and after acceptance, pour a higher grade of fine stone micro-expansive concrete and vibrate and maintain.

7. The construction method according to claim 6, characterized in that: In the step three, the opening direction of the water-stop steel plate is set toward the water-facing surface to improve the waterproof performance of the post-cast strip.

8. The construction method according to claim 6, characterized in that: In step six, the fish-scale protrusions allow the new and old concrete to be tightly bonded, and the joints of the post-casting strips can be ensured to be leak-free without roughening.

9. The construction method according to claim 6, characterized in that: In the step eight, the concrete in the post-cast zone area is poured using fine stone micro-expansive concrete with a strength grade one level higher than that of the original structural concrete, and is vibrated and fully cured in a timely manner after pouring.

10. The construction method according to any one of claim 6, characterized in that: The water-stop steel plate forms a physical partition at the joint of the new and old concrete, and cooperates with the rubber sleeve to seal the holes on the side formwork, together forming a double waterproof defense line to prevent water penetration and achieve leakage prevention.

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