Cover slab culvert structure for widening ditch side roadbed

Abstract

The utility model discloses a slab culvert structure for widening a ditch side roadbed, relates to the field of roadbed widening, and aims to solve the problem that the land for widening and widening the ditch side roadbed in a narrow space area is limited, a single-hole slab culvert is adopted as a widening foundation structure, and a side wall, a foundation and a bracket of the single-hole slab culvert are of an integrated structure. The two ends of the internal channel of the slab culvert are respectively provided with a drain grating net for intercepting floating objects, and a grit chamber is arranged outside the internal channel, so that deposition of settled sand in the slab culvert is reduced, and smooth drainage of the slab culvert is jointly guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of subgrade widening, and particularly relates to a culvert structure for widening the subgrade on the side of a ditch. Background Art

[0002] To meet the vehicle passing requirements, it is necessary to widen and reconstruct the existing road. The existing road widening usually adopts methods such as filling the subgrade widening with a retaining wall structure and widening the bridge. For the subgrade widening on the side of a ditch in a narrow area, one side is adjacent to the ditch and the other side has limited land for widening. There are no conditions for widening on both sides of the existing road, resulting in difficulty in ensuring the required road width for this type of special section. By adopting the form of covering the ditch with a cover plate and constructing a road surface structure above the cover plate, the designed road width can be ensured.

[0003] For the road widening by covering the ditch with a cover plate, the widened section is usually quite long, reaching hundreds of meters. Except for the widened section, the rest of the ditches are open channels. During the later operation period, situations such as floating objects and sediment deposition may occur, resulting in the compression of the flow cross-section of the ditch. In the case of a narrow space, the internal clearance height of the ditch is less than 1.5 m, there are existing structures on both sides of the road, and the geological conditions are poor. If the conventional culvert structure form is adopted, there will be a problem that the side walls of the culvert on both sides are independent foundations, which have high requirements for the bearing capacity of the foundation, and the poor on-site geological conditions are difficult to meet the design requirements for the bearing capacity. For this type of special section, there is also a problem that it is difficult for large-scale foundation treatment machinery to enter and exit the site, resulting in greater construction difficulty and higher construction cost. By adopting the box culvert structure form, due to the small internal clearance and the large construction difficulty of formwork erection and removal for the curved cast-in-place box culvert corresponding to the curved ditch, the construction efficiency is affected. Summary of the Utility Model

[0004] The purpose of the utility model is to address the defects existing in the prior art and provide a culvert structure for widening the subgrade on the side of a ditch. A single-hole culvert is used as the basic structure for widening. The side walls, foundation, and corbels of the single-hole culvert are an integrated structure, thereby improving the strength and reducing the requirements for the bearing capacity of the foundation. Trash racks are installed at both ends of the internal channel of the culvert to intercept floating objects, and a grit chamber is arranged outside the internal channel to reduce the sediment deposition in the culvert, jointly ensuring the smooth drainage of the culvert.

[0005] To achieve the above purpose, the following technical solutions are adopted:

[0006] A culvert structure for widening the subgrade on the side of a ditch, comprising:

[0007] The box culvert is installed in the open channel. The top of the box culvert is open, making the vertical section U-shaped. The side walls on at least one side of the box culvert extend to form corbels. The bottom slab, side walls and corbels of the box culvert are of an integral structure. A cover plate is installed on the top of the box culvert to block the open area, so that a channel communicating with the open channel is formed inside the box culvert. Trash racks are installed at both ends of the channel; the corbels on the side walls of the box culvert are lapped with a bridging slab. A backfill area for accommodating gravel is formed between the lower part of the cover plate, the side wall of the open channel and the side wall of the box culvert;

[0008] The road surface is paved above the cover plate, the box culvert and the bridging slab;

[0009] The grit chambers are arranged in the open channel outside both ends of the channel. The bottom surface of the grit chamber is lower than the inner bottom surface of the channel.

[0010] Further, a cushion layer is paved under the box culvert. The cushion layer extends under the backfill area and bears the box culvert.

[0011] Further, the reinforcement bars are arranged in the box culvert by an integral structure.

[0012] Further, paving is provided at the bottom of the open channel on the side of the grit chamber away from the box culvert. The top surface of the paving is flush with the inner bottom surface of the channel, so that a groove is formed at the bottom of the grit chamber.

[0013] Further, the top surface of the cover plate is flush with the top surface of the bridging slab. Gradation crushed stones for bearing the bridging slab are provided at the top of the backfill area under the bridging slab.

[0014] Further, the road surface includes a leveling layer, a waterproof layer and a surface layer paved in sequence from bottom to top. The leveling layer is of a reinforced concrete structure.

[0015] Further, the surface layer includes two layers of asphalt concrete with different specifications, and the two layers of asphalt concrete are paved in sequence.

[0016] Further, the trash rack is fixed to the end face of the box culvert, and the grid part of the trash rack covers the entire open part at the end of the channel.

[0017] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0018] Aiming at the problem of widening the subgrade on the side of the ditch in the currently narrow space area and the limited land for widening, the utility model adopts a single-hole box culvert as the basic structure for widening. The side walls, foundation and corbels of the single-hole box culvert are of an integral structure, so as to improve the strength and reduce the requirement for the bearing capacity of the foundation. It is applicable to widening the subgrade on the side of the ditch in the narrow space area. Trash racks are installed at both ends of the internal channel of the box culvert to intercept floating objects, and grit chambers are arranged outside the internal channel to reduce the sediment deposition in the box culvert, jointly ensuring the smooth drainage of the box culvert.

[0019] In this utility model, a slab culvert is used as the basic structure for widening, and a channel structure can be formed by combining the integral culvert body with a approach slab. Compared with a box culvert, the construction difficulty can be reduced and the construction efficiency can be improved.

[0020] In this utility model, grit chambers are arranged outside both ends of the slab culvert. The bottom elevation of the grit chamber is lower than the bottom surface of the internal channel of the slab culvert, so that the sand and gravel carried by the water body in the ditch can settle, reducing the amount of sand and gravel entering the slab culvert. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the slab culvert structure for widening the subgrade on the side of the ditch in the embodiment of this utility model.

[0022] Figure 2 It is a schematic diagram of the distribution positions of the slab culvert and the grit chamber in the embodiment of this utility model.

[0023] Figure 3 It is a top view schematic diagram of the road surface structure above the slab culvert in the embodiment of this utility model.

[0024] Figure 4 It is a schematic diagram of the trash rack in the embodiment of this utility model.

[0025] Description of reference numerals (in the order of first appearance): 1. cushion, 2. slab culvert, 3. channel, 4. side wall, 5. corbel, 6. backfill area, 7. trash rack, 8. approach slab, 9. road surface, 10. cover plate, 11. open channel, 12. bottom paving of the ditch, 13. grit chamber. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] Next, the technical solutions in the embodiments of this application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of this application.

[0027] When widening the subgrade on the side of the ditch in a space-limited area, if a conventional slab culvert structure is used, there will be a problem that the bearing capacity of the independent foundation of the culvert abutments on both sides is relatively high, and if a box culvert structure is used, the net clearance in the ditch will be small, affecting the water flow efficiency. Based on this, this embodiment provides a slab culvert structure for widening the subgrade on the side of the ditch. The main body is the slab culvert 2. The side wall 4, foundation and corbel 5 of the slab culvert 2 are integrally constructed, so as to improve the strength and reduce the requirement for the bearing capacity of the foundation. A trash rack 7 is arranged at both ends of the formed channel 3, and a grit chamber 13 is arranged outside the channel 3 to reduce the sediment deposition in the slab culvert 2 and jointly ensure the smooth drainage of the slab culvert 2.

[0028] Such as Figure 1As shown in the figure, the culvert structure for widening the roadbed on the side of the ditch mainly includes a culvert 2, a cover slab 10, a transition slab 8, a road surface 9, and a grit chamber 13. The culvert 2 is placed in an open channel 11. The top of the culvert 2 is open, making the vertical section U-shaped. The side wall 4 on at least one side of the culvert 2 extends to form a corbel 5. The bottom slab, side wall 4, and corbel 5 of the culvert 2 are an integral structure. A cover slab 10 is installed on the top of the culvert 2 to seal the open area, so that a channel 3 communicating with the open channel 11 is formed inside the culvert 2. In this embodiment, a single channel 3 is formed inside the culvert 2, thus forming a single-hole culvert 2.

[0029] Trash racks 7 are installed at both ends of the channel 3 respectively; the corbel 5 of the side wall 4 of the culvert 2 is overlapped with a transition slab 8. A backfill area 6 for accommodating gravel is formed between the cover slab 10, the side wall of the open channel 11, and the side wall 4 of the culvert 2. The road surface 9 is paved above the cover slab 10, the culvert 2, and the transition slab 8. In this embodiment, the gravel in the backfill area 6 has a crushed stone content of ≥ 30% and a compaction degree of ≥ 96%.

[0030] The grit chamber 13 is arranged in the open channel 11 outside both ends of the channel 3, and the bottom surface of the grit chamber 13 is lower than the inner bottom surface of the channel 3.

[0031] Specifically, as Figure 1 shown, the side wall 4, foundation, and corbel 5 of the culvert 2 adopt an integrated design, significantly enhancing the integrity and stiffness of the structure, reducing the deformation caused by uneven settlement of the foundation or external loads, and lowering the requirements for the bearing capacity of the foundation. The top of the culvert 2 is open to form a U-shaped structure, which is convenient for construction and maintenance, and at the same time increases the stability and anti-scouring ability of the structure.

[0032] In addition, in order to improve the strength of the culvert 2, the inside of the culvert 2 is arranged with steel bars in an integrated structure, so that the side wall 4, bottom slab, and corbel 5 form a frame integral structure. Through structural calculation, this structure has relatively low requirements for the bearing capacity of the foundation, usually reaching 60 - 70 Kpa is sufficient.

[0033] A cover slab 10 is installed on the top of the culvert 2 to close the open area and form a channel 3 communicating with the open channel 11. The selection of the cover slab 10 should consider its load-bearing capacity and durability to ensure traffic safety and long-term use. In this embodiment, the cover slab 10 is made of reinforced concrete and can be made of 25 cm thick C35 reinforced concrete.

[0034] Trash racks 7 are installed at both ends of the channel 3 to effectively intercept floating objects, prevent them from entering the inside of the culvert 2, and reduce the cleaning difficulty and cost. As Figure 4 shown, the mesh part size of the trash rack 7 is 10 cm × 10 cm. The trash rack 7 is fixed to the end face of the culvert 2, and the mesh part of the trash rack 7 covers the entire open part at the end of the channel 3.

[0035] Improve the structural strength and stability through integrated design, and reduce the foundation bearing requirements. Ensure that the internal channel 3 of the slab culvert 2 is unobstructed, and improve the drainage efficiency. Reduce the maintenance costs caused by blockage of floating objects and sediment deposition.

[0036] Lap the slab 8 on the corbel 5 of the side wall 4 of the slab culvert 2. The slab 8 serves as the support for the road surface 9 structure to ensure the flatness and stability of the road surface 9. The slab 8 is made of reinforced concrete and can be made of C35 reinforced concrete with a thickness of 25 cm.

[0037] A backfill area 6 is formed between the underside of the cover slab 10, the side wall of the open channel 11 and the side wall 4 of the slab culvert 2. The backfill area 6 is filled with materials such as gravel and sand to enhance the overall stability of the structure and facilitate drainage. The top surface of the cover slab 10 is flush with the top surface of the slab 8. The top of the backfill area 6 under the slab 8 is provided with graded broken stone to bear the slab 8.

[0038] The design of the slab 8 ensures a smooth transition between the road surface 9 and the slab culvert 2, improving the driving comfort. The setting of the backfill area 6 is conducive to the rapid discharge of rainwater and prevents water accumulation from damaging the road surface 9 and the slab culvert 2.

[0039] As Figure 2 shown, a grit chamber 13 is provided in the open channel 11 outside both ends of the channel 3. The bottom surface of the grit chamber 13 is lower than the internal bottom surface of the channel 3, facilitating the settlement and cleaning of sediments, effectively reducing the sediment deposition in the slab culvert 2, and ensuring unobstructed drainage. It facilitates the cleaning work and reduces the maintenance costs and difficulties.

[0040] A cushion layer 1 is laid under the slab culvert 2. The cushion layer 1 extends under the backfill area 6 and bears the slab culvert 2, providing uniform support for the entire structure. The cushion layer 1 is made of C20 concrete with a thickness of 10 cm. The cushion layer 1 can effectively disperse the loads of the slab culvert 2 and the road surface 9 above, avoiding damage to the foundation caused by local stress concentration. Through the support of the cushion layer 1, the stability of the slab culvert 2 and the entire structure is enhanced, and the risk of foundation settlement is reduced.

[0041] As Figure 3 shown, a bottom paving 12 is provided at the bottom of the open channel 11 on the side of the grit chamber 13 away from the slab culvert 2. The top surface of the bottom paving 12 is flush with the internal bottom surface of the channel 3, forming a groove at the bottom of the grit chamber 13. The groove design makes it easier for the sediments in the water flow to deposit in the grit chamber 13, reducing the amount of sediments entering the interior of the slab culvert 2.

[0042] In other alternative embodiments, a water retaining wall can also be provided on the side of the bottom paving 12 away from the grit chamber 13. The water retaining wall extends vertically below the bottom surface of the open channel 11. The bottom paving 12 and the water retaining wall are cast with plain concrete, aiming to protect the main structure from water flow scouring and reduce the impact on the structural stability.

[0043] As Figure 1 shown, in other alternative embodiments, a guardrail may also be installed on at least one side of the road surface 9. Connecting members are embedded in the bridging slab 8 below the guardrail. The bottom of the guardrail passes through the road surface 9 and is fixed to the connecting members embedded in the bridging slab 8. The guardrail provides safety protection for road users and prevents accidents from occurring. Fixing the guardrail by embedding connecting members ensures the stability and durability of the guardrail.

[0044] As Figure 1 shown, the road surface 9 is successively paved with a leveling layer, a waterproof layer and a surface layer from bottom to top. The leveling layer is a reinforced concrete structure, ensuring the flatness and load-bearing capacity of the road surface 9. The leveling layer is made of 8 cm thick cast-in-place C40 concrete and is arranged longitudinally along the cross-section direction of the road surface 9; the surface layer is composed of two layers of asphalt concrete with different specifications and is paved successively. In this embodiment, the surface layer can adopt permeable asphalt concrete, improving the water permeability and wear resistance of the road surface 9.

[0045] Among them, the permeable asphalt concrete in the lower layer is 6 cm thick permeable asphalt concrete PAC-20, and the permeable asphalt concrete in the upper layer is 4 cm thick permeable asphalt concrete PAC-13.

[0046] The leveling layer ensures the flatness of the road surface 9 and at the same time enhances the load-bearing capacity of the road surface 9. The permeable asphalt concrete improves the water permeability of the road surface 9 and reduces the damage to the road surface 9 caused by water accumulation; at the same time, its wear resistance also extends the service life of the road surface 9 and reduces the maintenance cost caused by the damage of the road surface 9.

[0047] The specific embodiments of the utility model have been described in detail above, but they are only examples, and the utility model is not limited to the specific embodiments described above. For those skilled in the art, any equivalent modification or substitution of the utility model is also within the scope of the utility model. Therefore, all equal transformations, modifications and improvements made without departing from the spirit and principles of the utility model should be covered within the scope of the utility model.

Claims

1. A slab culvert structure for widening a ditch side roadbed, characterized in that: include: The cover culvert is placed in the open channel. The top of the cover culvert is open so that the vertical section is U-shaped. The side wall of at least one side of the cover culvert is extended to form a corbel. The bottom plate, side wall and corbel of the cover culvert are integrated. A cover plate is installed on the top of the cover culvert to block the open area, so that a channel connected to the open channel is formed inside the cover culvert, and trash nets are installed at both ends of the channel; the corbels of the side walls of the cover culvert are overlapped with lap boards, and a backfill area for accommodating sand and gravel is formed below the cover plate, between the side wall of the open channel and the side wall of the cover culvert; Pavement, laid over the slab, slab culvert and slab; The grit chamber is set in the open channel outside the two ends of the channel, and the bottom surface of the grit chamber is lower than the bottom surface inside the channel.

2. The slab culvert structure for widening the ditch side roadbed according to claim 1, characterized in that: A cushion layer is laid under the cover culvert, which extends to below the backfill area and supports the cover culvert.

3. The slab culvert structure for widening the ditch side roadbed according to claim 1, characterized in that: The interior of the slab culvert adopts an integrated structure to arrange steel bars.

4. The slab culvert structure for widening the ditch side roadbed according to claim 1, characterized in that: The bottom of the open channel of the grit chamber away from the cover culvert is provided with ditch bottom paving, and the top surface of the ditch bottom paving is flush with the bottom surface in the channel, so that a groove is formed at the bottom of the grit chamber.

5. The slab culvert structure for widening the ditch side roadbed according to claim 1, characterized in that: The top surface of the cover plate is flush with the top surface of the buttress plate, and the top of the backfill area below the buttress plate is provided with graded crushed stones for supporting the buttress plate.

6. The slab culvert structure for widening the ditch side roadbed according to claim 1, characterized in that: The road surface comprises a leveling layer, a waterproof layer and a surface layer which are laid in sequence from bottom to top, and the leveling layer is a reinforced concrete structure.

7. The slab culvert structure for widening the ditch side roadbed according to claim 6, characterized in that: The surface layer comprises two layers of asphalt concrete with different specifications, and the two layers of asphalt concrete are laid sequentially.

8. The slab culvert structure for widening the ditch side roadbed according to claim 1, characterized in that: The trash-blocking net is fixed to the end surface of the cover culvert, and the mesh portion of the trash-blocking net covers the entire open portion at the end of the channel.

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