A temporary plugging structure suitable for reserved hole of rail transit

Abstract

The utility model discloses a kind of temporary plugging structure suitable for rail transit reserved hole, including temporary retaining wall, temporary cover plate, I-beam, corrugated steel plate bottom mould;Temporary retaining wall is fixed on the roof beam of reserved hole, and the top inner side of temporary retaining wall is equipped with the step for installing I-beam, I-beam has multiple, and each I-beam is fixed on the step of temporary retaining wall by bolt at both ends, and corrugated steel plate bottom mould is fixed on I-beam by bolt, temporary cover plate is cast on corrugated steel plate bottom mould, and is connected with temporary retaining wall to form whole. The structure has good stability, waterproofness, high construction efficiency, and can reduce engineering cost.

Description

Technical Field

[0001] This utility model relates to the field of construction technology for underground engineering of urban rail transit, and specifically to a temporary sealing structure suitable for reserved holes in rail transit. Background Technology

[0002] During the design and construction of rail transit projects, several large openings are typically reserved in the top and middle slabs of subway stations and tunnel structures to accommodate tunnel boring machines (TBMs), track laying, and the hoisting of materials and equipment. Typical reserved openings include TBM hoisting holes, excavation holes, and track panel wells. Some reserved openings are located on existing road surfaces. After construction is completed, these openings need to be sealed and the road surface backfilled to ensure normal traffic and safe operation of the existing road surface.

[0003] Currently, the temporary sealing of reserved holes often uses concrete pouring, which results in a relatively sturdy structure, but the construction time is long and the removal is difficult.

[0004] Utility model patent CN 222456175 U discloses a temporary sealing structure for openings in the roof slab of an underground structure. The structure includes a retaining wall positioned above the roof slab and surrounding the opening, with a tongue-and-groove joint at its top; a cover plate assembly comprising multiple cover plates arranged horizontally, positioned within the tongue-and-groove joint to seal the opening at the top of the retaining wall; a waterproof layer laid on top of the cover plate assembly; and a pavement layer laid on top of the waterproof layer. The cover plate assembly of this sealing structure is composed of multiple cover plates spliced ​​together, not forming a unified whole, and therefore has low stability.

[0005] Utility model patent CN 220434748 U discloses a temporary sealing structure for shield tunnel hoisting holes in subway stations. This structure features a precast slab topped with a reinforcing mesh, the top of which is connected to a concrete surface layer. Inside the precast slab are several hollow concrete beams, with protrusions on both sides of their bottom. Foam board and sealant are used for connection. The left side of the precast slab is connected to the first shield tunnel retaining wall via foam board, sealant, and the right side is connected to the second shield tunnel retaining wall via foam board and sealant. While this structure, with its concrete surface layer and reinforcing mesh, provides some protection and waterproofing, it is a disposable structure, the materials are not recyclable, and it is not cost-effective. Utility Model Content

[0006] The purpose of this utility model application is to address the shortcomings of the above-mentioned technology by providing a temporary sealing structure suitable for reserved holes in rail transit. The I-beams and corrugated steel plate bottom formwork of this structure can be disassembled and recycled, reducing the span of the temporary cover plate. After the temporary retaining wall and the temporary cover plate are poured, they form an integral whole, which has good stability and waterproofness, high construction efficiency, and can reduce project costs.

[0007] To achieve the above objectives, the present invention provides a temporary sealing structure for reserved holes in rail transit, which adopts the following technical solution: A temporary sealing structure suitable for reserved openings in rail transit includes a temporary retaining wall, a temporary cover plate, I-beams, and a corrugated steel plate bottom formwork. The temporary retaining wall is fixed to the top beam of the reserved opening. The inner side of the top of the temporary retaining wall is provided with a step for installing the I-beams. There are multiple I-beams, and both ends of each I-beam are fixed to the step of the temporary retaining wall by bolts. The corrugated steel plate bottom formwork is fixed to the I-beams by bolts. The temporary cover plate is cast on the corrugated steel plate bottom formwork and is connected to the temporary retaining wall to form an integral whole.

[0008] Optionally, the temporary retaining wall is reinforced with a reinforcement ratio of not less than 0.3%, and the reinforcement is arranged in a double layer and in both directions with a spacing of not more than 150 mm; the reinforcement at the connection between the temporary retaining wall and the top beam extends into the top beam and the anchorage length is not less than 37 times the reinforcement diameter.

[0009] Optionally, the I-beam is arranged perpendicular to the long side of the reserved hole.

[0010] Optionally, the thickness of the corrugated steel plate bottom mold is 2-3mm, and the wave height is ≥50mm.

[0011] Optionally, there are multiple corrugated steel plate bottom molds, and adjacent corrugated steel plate bottom molds are connected by overlapping or special connectors, with an overlap length ≥100mm.

[0012] Furthermore, the joint between two adjacent corrugated steel plate bottom molds is filled with sealant or double-sided tape for waterproofing.

[0013] Optionally, the temporary cover plate is reinforced internally, and the reinforcement is arranged in a double layer and in both directions, with a reinforcement ratio of not less than 0.25% in each layer and in each direction.

[0014] Optionally, the top elevation of the temporary retaining wall is the same as the roadbed elevation.

[0015] Optionally, the top surface elevation of the temporary cover plate is the same as the top surface elevation of the temporary retaining wall.

[0016] Optionally, the upper surface of the corrugated steel plate bottom mold is coated with a water-based release agent or a special template oil.

[0017] The beneficial effects achieved by this utility model are: 1. This structure uses multiple I-beams on the temporary retaining wall to support the corrugated steel plate bottom formwork and temporary cover plate, thereby reducing the span of the temporary cover plate. After the temporary cover plate is poured, it forms an integral whole with the temporary retaining wall. Therefore, this structure has good stability and sufficient load-bearing capacity. 2. After the temporary cover is poured, it forms an integral whole with the temporary retaining wall without gaps, thus providing good waterproofing. 3. Using corrugated steel plate bottom formwork as the bottom formwork for temporary cover concrete pouring eliminates the need for scaffolding and formwork installation compared to traditional cast-in-place concrete construction, thus reducing construction difficulty, increasing construction efficiency, and shortening the construction period. 4. The two ends of the I-beam are fixed to the steps of the temporary retaining wall with bolts. When the structure is removed, the I-beam can be easily disassembled and reused. At the same time, the corrugated steel plate bottom formwork can also be reused, thus reducing the project cost. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model; Figure 2 This is a top-view structural diagram of an embodiment of the present utility model; Figure 3 This is a partial structural schematic diagram of an embodiment of the present utility model; The components include: 1. Top slab beam; 2. Top slab; 3. Temporary retaining wall; 4. Temporary cover plate; 5. I-beam; 6. Corrugated steel plate bottom formwork. Detailed Implementation

[0019] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0020] The following is in conjunction with the appendix Figure 1-3 The present invention will be described in further detail below.

[0021] like Figure 1-3 As shown, a temporary sealing structure suitable for reserved openings in rail transit includes a temporary retaining wall 3, a temporary cover plate 4, an I-beam 5, and a corrugated steel plate bottom formwork 6. The temporary retaining wall 3 is fixed to the top beam 1 of the reserved opening. The inner side of the top of the temporary retaining wall 3 is provided with a step for installing the I-beam 5. There are multiple I-beams 5, and both ends of each I-beam 5 are fixed to the step of the temporary retaining wall 3 by bolts. The corrugated steel plate bottom formwork 6 is fixed to the I-beam 5 by bolts. The temporary cover plate 4 is cast on the corrugated steel plate bottom formwork 6 and is connected to the temporary retaining wall 3 to form an integral whole.

[0022] In some embodiments, the temporary retaining wall 3 is internally reinforced with a reinforcement ratio of not less than 0.3%, and the reinforcement is arranged in a double layer and bidirectional manner with a spacing of not more than 150 mm. The reinforcement at the connection between the temporary retaining wall 3 and the top beam 1 extends into the top beam 1, with an anchorage length of not less than 37 times the reinforcement diameter. By adopting this technical solution, the structural strength of the temporary retaining wall 3 is further improved. The height of the temporary retaining wall 3 is determined based on the actual elevation of the reserved holes and the original road surface elevation, and is constructed to the roadbed surface elevation, reserving the construction height for the roadbed and pavement. The thickness and reinforcement of the temporary retaining wall 3 are determined based on the retaining height and the load transmitted from the temporary cover plate 4. The thickness of the temporary retaining wall 3 can be taken as the calculated value of the most unfavorable position and arranged around the reserved holes.

[0023] like Figure 2 As shown, in some embodiments, the I-beams 5 are arranged perpendicular to the long side of the pre-drilled holes. By adopting this technical solution, the I-beams 5 support the corrugated steel plate bottom formwork 6 and the temporary cover plate 4, reducing the span of the temporary cover plate 4 and enhancing the load-bearing capacity and stability of the structure. When dismantling the I-beams 5 later, the structure can be separated simply by loosening the bolts, and the dismantled I-beams can be reused. The cross-sectional dimensions and spacing of the I-beams 5 are determined by the upper road surface load, vehicle load, and the thickness of the temporary cover plate 4.

[0024] In some embodiments, the corrugated steel plate bottom mold 6 has a thickness of 2-3 mm and a wave height of ≥50 mm. By adopting this technical solution, the corrugated steel plate bottom mold 6 can withstand the self-weight of concrete, construction load, and vibration impact force.

[0025] In some embodiments, there are multiple corrugated steel plate bottom molds 6, and adjacent corrugated steel plate bottom molds 6 are connected by overlapping or special connectors, with an overlap length of ≥100mm. By adopting this technical solution, the overlap between multiple corrugated steel plate bottom molds 6 is tight and stable.

[0026] In some embodiments, the joint between two adjacent corrugated steel plate bottom molds 6 is filled with sealant or double-sided tape for seepage prevention. By adopting this technical solution, cement slurry leakage can be prevented.

[0027] In some embodiments, the temporary cover 4 is internally reinforced with double-layer, bidirectional reinforcement, with a reinforcement ratio of not less than 0.25% in each direction of each layer. The reinforcement of the temporary cover 4 is further densified at the connection with the temporary retaining wall 3. By adopting this technical solution, the bearing capacity of the temporary cover 4 is further improved. The thickness and reinforcement of the temporary cover 4 are determined according to the upper road surface load and vehicle load.

[0028] In some embodiments, the top elevation of the temporary retaining wall 3 is the same as the roadbed surface elevation. By adopting this technical solution, the construction height of the roadbed and pavement is reserved.

[0029] In some embodiments, the top surface elevation of the temporary cover plate 4 is the same as the top surface elevation of the temporary retaining wall 3. By adopting this technical solution, the top surface of the structure is flat after sealing the reserved holes, which is beneficial for road construction.

[0030] In some embodiments, the upper surface of the corrugated steel plate bottom mold 6 is coated with a water-based release agent or a special formwork oil. By adopting this technical solution, it is possible to avoid affecting the appearance quality of the concrete of the temporary cover plate 4.

[0031] The specific implementation steps of this embodiment are as follows: S01: Clean the construction site to ensure that the working surface is flat and free of debris.

[0032] S02: Install the formwork support frame and joists for temporary retaining wall 3 to ensure the formwork is stable and can withstand the weight of the concrete. Install the formwork for temporary retaining wall 3 according to the design elevation and dimensions, ensuring the surface is flat and the joints are tight, and ensuring that the flatness and verticality of the formwork meet the requirements.

[0033] S03: According to the structural design drawings, tie the reinforcement of temporary retaining wall 3. If a retaining wall higher than the ground needs to be constructed above temporary retaining wall 3 later, then pre-embed the retaining wall reinforcement and reinforcement connectors at the top of temporary retaining wall 3.

[0034] S04: After the formwork and reinforcement of temporary retaining wall 3 are ready, concrete pouring shall be carried out. Concrete shall be poured in layers, with each layer controlled to a thickness of 30-50 cm, and compacted using a vibrator. After the concrete pouring is completed, the threaded sleeve shall be pre-embedded according to the design drawings.

[0035] S05: Drill holes in the I-beam 5 in advance according to the location of the installation bolts. Install the I-beam 5 on the temporary retaining wall 3 and tighten the bolts.

[0036] S06: Drill bolt mounting holes on the corrugated steel plate bottom formwork 6 and fix it to the I-beam 5 with bolts. Apply water-based release agent or special formwork oil to the surface of the corrugated steel plate bottom formwork 6. The application should be uniform and free of liquid accumulation to avoid affecting the appearance quality of the concrete.

[0037] S07: Tie the reinforcement of temporary cover plate 4 and pour concrete for temporary cover plate 4.

[0038] S08: Backfill and complete road construction according to the original road surface design to restore traffic.

[0039] S09: When needed for later track hoisting or shield tunneling, the temporary cover plate 4 can be removed. After the track hoisting or shield tunneling is completed, the temporary retaining wall 3 and the temporary cover plate 4 can be completely cut off with a wire saw, the I-beam 5 and the corrugated steel plate bottom formwork 6 can be removed, the main structure top slab 2 can be poured, and the reserved holes can be permanently sealed.

[0040] It should be noted that the above description of the technical solutions is exemplary, and this specification may be embodied in different forms and should not be construed as limiting it to the technical solutions set forth herein. Rather, providing these descriptions will ensure that the disclosure of this utility model is thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Furthermore, the technical solutions of this utility model are defined only by the scope of the claims.

Claims

1. A temporary sealing structure suitable for reserved holes in rail transit, characterized in that: Includes temporary retaining wall (3), temporary cover plate (4), I-beam (5) and corrugated steel plate bottom formwork (6); The temporary retaining wall (3) is fixed on the top beam (1) with the reserved hole. The top inner side of the temporary retaining wall (3) is provided with a step for installing the I-beam (5). There are multiple I-beams (5). The two ends of each I-beam (5) are fixed to the step of the temporary retaining wall (3) by bolts. The corrugated steel plate bottom mold (6) is fixed to the I-beam (5) by bolts. The temporary cover plate (4) is cast on the corrugated steel plate bottom mold (6) and is connected to the temporary retaining wall (3) to form an integral whole.

2. A temporary sealing structure for reserved holes in rail transit according to claim 1, characterized in that: The temporary retaining wall (3) is reinforced with a reinforcement ratio of not less than 0.3%. The reinforcement is arranged in a double layer and bidirectional manner with a spacing of not more than 150 mm. The reinforcement at the connection between the temporary retaining wall (3) and the top beam (1) extends into the top beam (1) with an anchorage length of not less than 37 times the reinforcement diameter.

3. A temporary sealing structure for reserved holes in rail transit according to claim 1, characterized in that: The I-beam (5) is arranged perpendicular to the long side of the reserved hole.

4. A temporary sealing structure for reserved holes in rail transit according to claim 1, characterized in that: The corrugated steel plate bottom mold (6) has a thickness of 2-3mm and a wave height of ≥50mm.

5. A temporary sealing structure for reserved holes in rail transit according to claim 1, characterized in that: There are multiple corrugated steel plate bottom molds (6). The two adjacent corrugated steel plate bottom molds (6) are connected by overlapping or special connectors, with an overlap length of ≥100mm.

6. A temporary sealing structure for reserved holes in rail transit according to claim 5, characterized in that: The joint between two adjacent corrugated steel plate bottom molds (6) is filled with sealant or double-sided tape for seepage prevention.

7. A temporary sealing structure for reserved holes in rail transit according to claim 1, characterized in that: The temporary cover plate (4) is reinforced inside, and the reinforcement is arranged in a double layer and in both directions, with a reinforcement ratio of not less than 0.25% in each layer and in each direction.

8. A temporary sealing structure for reserved holes in rail transit according to claim 1, characterized in that: The top elevation of the temporary retaining wall (3) is the same as the roadbed elevation.

9. A temporary sealing structure for reserved holes in rail transit according to claim 1, characterized in that: The top surface elevation of the temporary cover plate (4) is the same as the top surface elevation of the temporary retaining wall (3).

10. A temporary sealing structure for reserved holes in rail transit according to any one of claims 1-9, characterized in that: The upper surface of the corrugated steel plate bottom mold (6) is coated with water-based release agent or special template oil.

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