A vertical shaft grating structure for inverted siphon culvert dredging maintenance

Abstract

This utility model discloses a grid structure for dredging and maintenance of an inverted siphon culvert. It includes a vertical shaft with a horizontal grid at the shaft opening. A debris-blocking opening is formed on the side wall of the shaft, and a debris-blocking grid is vertically installed inside the debris-blocking opening. The horizontal grid is composed of multiple sub-grid components to cover the shaft opening. A support beam is provided inside the shaft opening to support the sub-grid components. The length direction of the support beam is parallel to the length direction of the debris-blocking opening. The multiple sub-grid components are divided into a first sub-grid and a second sub-grid. The opposite ends of the first sub-grid are respectively installed on support steps opposite each other at the shaft opening. One end of the second sub-grid is installed on a support step on one side of the shaft opening, and its opposite end extends above the debris-blocking opening and is supported by the debris-blocking grid. This utility model can disassemble the horizontal grid into multiple sub-grids to reduce the weight of a single piece, and can also provide a central support beam to reduce the rigidity requirements of the sub-grids, thereby reducing thickness and weight, and facilitating manual handling.

Description

Technical Field

[0001] This utility model relates to the field of culvert silt prevention and dredging technology, specifically to a grid structure for vertical shaft dredging and maintenance of an inverted siphon culvert. Background Technology

[0002] In plain river network areas, long-distance inverted siphon culverts are often constructed to ensure connectivity between upstream and downstream sections of rivers, crossing obstacles such as roads and embankments. These projects are mostly located in urban or suburban areas, where underground pipelines (such as power, communication, and gas lines) are densely distributed beneath and around the roads, and soil conditions may be complex. Using open-cut methods carries high risks and significant impacts. Therefore, the caisson combined with pipe jacking method has become a common construction method for culvert passages. This requires the installation of working shafts on both sides of the river, upstream and downstream, which are then connected by pipe jacking to form the culvert.

[0003] To ensure the river's flood control and ecological water flow capacity, integrate with the environmental landscape, and facilitate subsequent siltation and maintenance, these vertical shafts are often designed as deep-well structures operating below the normal water level (the top of the shaft is only 1.0 to 1.5 meters above the riverbed). A debris-blocking inlet is installed on the side of the shaft; under normal circumstances, water flow can overflow the top of the shaft and enter the culvert. When the water level is low, water is supplemented through the side inlet. To ensure safety and prevent floating debris and large objects from clogging the culvert passage (a crucial aspect of inverted siphon siltation prevention), the top of the shaft is covered with a horizontal grating as a cover, and vertical debris-blocking gratings are installed at the side inlets for protection.

[0004] In existing deep-well vertical shaft structures, the horizontal grids are typically integral or large-section structures, relying on support steps and beams at the shaft opening for load-bearing, while the side-mounted debris barriers are independently installed using vertical hoisting. During crucial dredging and desilting operations in inverted siphon culverts, the horizontal grids need to be moved to allow personnel or dredging equipment access to the shaft. However, moving large, integral or section-mounted horizontal grid covers is extremely labor-intensive, often requiring heavy lifting equipment. The process is cumbersome, complex, and space-consuming, significantly reducing the efficiency of dredging and maintenance and increasing the risk of inverted siphon system failure due to clogging.

[0005] To facilitate manual handling for routine or emergency dredging, large horizontal screens are sometimes disassembled into multiple long strip screens to reduce the weight of each unit. However, the vertical installation of the lateral screens occupies lateral space, and the upper part of the shaft sidewall cannot provide continuous support steps due to the presence of water inlets. This forces the long strip screens to be arranged parallel to the screens. More importantly, the central support beam needs to be firmly supported at both ends by the shaft wall to effectively distribute the load of the screens and any potential load from the dredging equipment. However, the presence of side openings means that one end cannot be reliably supported, making it impossible to install the central support beam. This forces the long strip screens to significantly increase their cross-sectional dimensions (thickness) to meet rigidity and load-bearing requirements, which in turn increases the weight of each unit and greatly inconveniences manual handling for rapid dredging operations. Utility Model Content

[0006] The purpose of this utility model is to provide a grid structure for dredging and maintenance of inverted siphon culverts, which can divide the horizontal grid into multiple sub-grids to reduce the weight of a single piece, and can be equipped with a central support beam to reduce the rigidity requirements of the sub-grids, thereby reducing the thickness and weight, and facilitating manual handling.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is: a grid structure for dredging and maintenance of an inverted siphon culvert, comprising a vertical shaft, a horizontal grid at the shaft opening, a debris-blocking opening on the side wall of the shaft, a debris-blocking grid vertically installed inside the debris-blocking opening, the horizontal grid being composed of multiple sub-grid components to cover the shaft opening, a support beam for supporting the sub-grid components being provided inside the shaft opening, the length direction of the support beam being parallel to the length direction of the debris-blocking opening, the multiple sub-grid components being divided into a first sub-grid and a second sub-grid, the opposite ends of the first sub-grid being respectively installed on support steps opposite to each other at the shaft opening, one end of the second sub-grid being installed on a support step on one side of the shaft opening, and its opposite end extending above the debris-blocking opening and being supported by the debris-blocking grid.

[0008] A further improvement of this utility model is that support steps are also provided on both sides of the support beam along its length. The first sub-grid includes two separate first parts, each first part having a first end and a second end. The first end is installed on the support step of the support beam, and the second end is installed on the support step of the wellhead. The second sub-grid includes two separate first parts and a second part, each first part having a first end and a second end. The first end is installed on the support step of the support beam, and the second end is installed on the support step of the wellhead. Each second part has a first end and a second end. The first end is installed on the support step of the support beam, and the second end extends above the debris barrier and is supported by the debris barrier.

[0009] A further improvement of this utility model is that the height of the upper surface of the trash rack is flush with the height of the support surface of the wellhead support step.

[0010] A further improvement of this utility model is that a limiting member is provided on the upper surface of the trash rack, and the distance between the limiting member and the kick surface of the support step of the support beam is adapted to the length of the second sub-grid.

[0011] A further improvement of this utility model is that both the first sub-grid and the second sub-grid include a channel steel frame, with support plates spaced parallel to each other along the length direction inside the channel steel frame, and support ribs spaced parallel to each other along the width direction inside the channel steel frame, the support ribs and the support plates forming a cross-sectional support structure.

[0012] A further improvement of this utility model is that the upper end of the support plate is provided with mounting holes along its length direction that correspond one-to-one with the number of support ribs, and each support rib passes through the mounting holes on the corresponding multiple support plates and is welded to the support plate.

[0013] A further improvement of this utility model is that the support plate is made of flat steel and the support ribs are made of steel bars.

[0014] A further improvement of this utility model is that the wellhead of the vertical shaft is rectangular, one side of the vertical shaft is a vertical plane, the debris barrier is set on the vertical plane, and the debris barrier is symmetrically provided with vertical mounting grooves, and the two sides of the debris barrier mesh cooperate with the mounting grooves.

[0015] A further improvement of this utility model is that the two first parts of the first sub-grid have the same length, and the first part of the first sub-grid has the same length as the first part of the second sub-grid.

[0016] A further improvement of this utility model is that the first sub-grid has four sections and the second sub-grid has six sections.

[0017] The beneficial effects of this utility model are as follows:

[0018] This invention reduces the weight of a single sub-grid by dividing a horizontal grid into multiple sub-grid components (a first sub-grid and a second sub-grid), making it easier to handle manually. By setting support beams parallel to the length of the intercepting outlet, the vertical installation of the intercepting grid avoids interference with the layout while allowing the sub-grids to be supported by the support beams. One end of the second sub-grid is supported by the intercepting grid. This design saves space by utilizing existing structures, reduces the rigidity requirements of the sub-grids, and thus reduces thickness and weight, making it easier to handle manually, improving the efficiency of dredging and maintenance, and reducing the risk of the inverted siphon system failing due to clogging.

[0019] This invention adds supporting steps on both sides of the supporting beam and further subdivides the first and second sub-grids into multiple separate parts (such as the two first parts of the first sub-grid, and the first and second parts of the second sub-grid), making each sub-grid assembly smaller and lighter, and easier to move manually. The cantilever length of each sub-grid segment is shortened, further reducing stiffness requirements and thickness, and thus reducing weight.

[0020] This utility model provides a limiting component on the upper surface of the debris barrier, and adapts the length of the second sub-barrel to the distance between the limiting component and the support beam support step kick surface, effectively fixing the position of the second sub-barrel and preventing displacement or sliding under transportation or water flow impact, thus enhancing the reliability of the structure. Attached Figure Description

[0021] Figure 1 This is a top view of the structure of this utility model.

[0022] Figure 2 This is a top view of the vertical shaft structure of this utility model.

[0023] Figure 3 This is a side view sectional diagram of the structure of this utility model.

[0024] Figure 4 This is a top view of the channel steel frame structure of this utility model.

[0025] Figure 5 This is a side sectional view of the channel steel frame structure of this utility model.

[0026] In the diagram, 1-vertical shaft, 2-sludge trap, 3-sludge trap, 4-support beam, 5-first sub-grid, 6-second sub-grid, 7-support step, 8-limiting component, 9-channel steel frame, 10-support plate, 11-support rib, 12-installation groove, 13-first part of the first sub-grid, 14-first part of the second sub-grid, 15-second part of the second sub-grid. Detailed Implementation

[0027] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments.

[0028] Example 1: Combination Figures 1-5It is known that a vertical shaft grid structure for dredging and maintenance of an inverted siphon culvert includes a vertical shaft 1, a horizontal grid at the opening of the shaft 1, a debris-blocking opening 2 on the side wall of the shaft 1, and a debris-blocking grid 3 vertically installed inside the debris-blocking opening 2. The horizontal grid is composed of multiple sub-grid components to cover the opening, and a support beam 4 for supporting the sub-grid components is provided inside the opening. The length direction of the support beam 4 is parallel to the length direction of the debris-blocking opening 2. The multiple sub-grid components are divided into a first sub-grid 5 and a second sub-grid 6. The two opposite ends of the first sub-grid 5 are respectively installed on the support steps 7 opposite to each other at the opening. One end of the second sub-grid 6 is installed on the support step 7 on one side of the opening, and its opposite end extends to the top of the debris-blocking opening 2 and is supported by the debris-blocking grid 3.

[0029] Supporting steps 7 are also provided on both sides of the length direction of the supporting beam 4. The first sub-grid 5 includes two separate first parts (preferably, the two first parts are two separate grid units with the same structure). Each first part has a first end and a second end. Its first end is installed on the supporting step 7 of the supporting beam 4, and its second end is installed on the supporting step 7 of the wellhead. The second sub-grid 6 includes separate first parts and second parts. Each first part has a first end and a second end. Its first end is installed on the supporting step 7 of the supporting beam 4, and its second end is installed on the supporting step 7 of the wellhead. Each second part has a first end and a second end. Its first end is installed on the supporting step 7 of the supporting beam 4, and its second end extends to the top of the debris barrier 2 and is supported by the debris barrier 3.

[0030] The height of the upper surface of the debris barrier 3 is flush with the height of the support surface of the wellhead support step 7. This ensures that the second sub-bar has a uniform and continuous support surface when it extends above the debris barrier, preventing the bar from tilting or local stress concentration caused by the height difference, thus improving the structural safety and stability.

[0031] A limiting member 8 is provided on the upper surface of the debris barrier 3. The distance between the limiting member 8 and the kick surface of the support step of the support beam is adapted to the length of the second sub-barrel 6. The limiting member 8 effectively fixes the position of the second sub-barrel, preventing displacement or sliding under transportation or water flow impact, enhancing the reliability and durability of the structure, facilitating installation alignment, reducing human error, ensuring quick and accurate placement of the sub-barrel, and improving maintenance efficiency. Preferably, the limiting member 8 is a right-angle steel. The horizontal part of the angle steel is fixedly connected to the upper surface of the debris barrier 3, and the distance between the vertical part of the angle steel and the kick surface of the support step of the support beam is adapted to the length of the second sub-barrel 6.

[0032] Both the first sub-grid 5 and the second sub-grid 6 include a channel steel frame 9. Support plates 10 are provided parallel to each other along the length direction inside the channel steel frame 9. Support ribs 11 are provided parallel to each other along the width direction inside the channel steel frame 9. The support ribs 11 and the support plates 10 form a cross-sectional support structure.

[0033] The upper end of the support plate 10 has mounting holes along its length that correspond one-to-one with the number of support ribs 11. Each support rib 11 passes through the mounting holes on the corresponding multiple support plates 10 and is welded to the support plate 10.

[0034] Preferably, the support plate 10 is made of flat steel, and the support rib 11 is made of steel bar, preferably Q235 steel. Because it is underwater, all exposed surfaces of the steel structure are protected against corrosion (such as hot-dip galvanizing, spraying heavy-duty anti-corrosion coating, etc.). More preferably, the steel bar is φ12 steel bar, the spacing between adjacent steel bars is 80~120mm, and the spacing between adjacent flat steel bars is 80~120mm.

[0035] Flat steel and reinforcing bars are both common, low-cost materials that are easy to procure and process, reducing production costs. Furthermore, this combination facilitates welding and installation.

[0036] The opening of the vertical shaft 1 is rectangular, and one side of the vertical shaft 1 is a vertical plane. The debris barrier 2 is set on the vertical plane, and the debris barrier 2 is symmetrically provided with vertical mounting grooves 12. The two sides of the debris barrier 3 are matched with the mounting grooves 12.

[0037] Preferably, the two first sections of the first sub-grid 5 are of the same length, and the first section of the first sub-grid 5 is of the same length as the first section of the second sub-grid 6. During production, only two length specifications of grid segments need to be manufactured, facilitating on-site installation. Preferably, there are four first sub-grids 5 and six second sub-grids 6.

[0038] The working principle of the vertical shaft grid structure for dredging and maintenance of an inverted siphon culvert provided by the utility model is as follows:

[0039] The horizontal screen, composed of multiple first sub-screens 5 and second sub-screens 6, covers the opening of the vertical shaft 1. The two first sections of the first sub-screen 5 are fixed at both ends to the support steps 7 of the shaft opening and the support steps 7 of the support beam 4, respectively. The first section of the second sub-screen 6 is fixed at both ends to the support steps 7 of the shaft opening and the support steps 7 of the support beam 4, while its second section is fixed at one end to the support step 7 of the support beam 4, and the other end extends overhanging above the debris barrier 2, resting on the upper surface of the debris barrier 3, where it is supported. A limiting member 8 (angle steel) on the debris barrier 3 abuts against the end of the second section to prevent it from moving along its length. Floating debris carried by the water flow is intercepted above the shaft opening by the horizontal screen, and some water that might enter through the debris barrier 2 is intercepted by the debris barrier 3.

[0040] In the description of this utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Any equivalent structural or procedural transformations made using the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A grid structure for dredging and maintenance of an inverted siphon culvert, comprising a vertical shaft (1), wherein a horizontal grid is provided at the opening of the vertical shaft (1), and a debris-blocking opening (2) is provided on the side wall of the vertical shaft (1), wherein a debris-blocking grid (3) is vertically installed inside the debris-blocking opening (2), characterized in that: The horizontal grid is composed of multiple sub-grid components to cover the well opening. The well opening is provided with a support beam (4) for supporting the sub-grid components. The length direction of the support beam (4) is parallel to the length direction of the debris barrier (2). The multiple sub-grid components are divided into a first sub-grid (5) and a second sub-grid (6). The two opposite ends of the first sub-grid (5) are respectively installed on the support steps (7) that are opposite to each other in the well opening. One end of the second sub-grid (6) is installed on the support step (7) on one side of the well opening, and its opposite end extends to the top of the debris barrier (2) and is supported by the debris barrier (3).

2. The grid structure for dredging and maintenance of an inverted siphon culvert shaft according to claim 1, characterized in that: The support beam (4) is also provided with support steps (7) on both sides of its length direction. The first sub-grid (5) includes two separate first parts, each first part having a first end and a second end. Its first end is installed on the support step (7) of the support beam (4), and its second end is installed on the support step (7) of the wellhead. The second sub-grid (6) includes separate first parts and second parts. Each first part has a first end and a second end. Its first end is installed on the support step (7) of the support beam (4), and its second end is installed on the support step (7) of the wellhead. Each second part has a first end and a second end. Its first end is installed on the support step (7) of the support beam (4), and its second end extends to the top of the debris barrier (2) and is supported by the debris barrier (3).

3. The grid structure for dredging and maintenance of an inverted siphon culvert shaft according to claim 1, characterized in that: The height of the upper end of the trash rack (3) is flush with the height of the support surface of the wellhead support step (7).

4. The grid structure for dredging and maintenance of an inverted siphon culvert shaft according to claim 3, characterized in that: The upper surface of the debris barrier (3) is provided with a limiting member (8), and the distance between the limiting member (8) and the kick surface of the support step of the support beam is adapted to the length of the second sub-grid (6).

5. The grid structure for dredging and maintenance of an inverted siphon culvert shaft according to claim 1, characterized in that: The first sub-grid (5) and the second sub-grid (6) both include a channel steel frame (9). Support plates (10) are provided parallel to each other along the length direction inside the channel steel frame (9). Support ribs (11) are provided parallel to each other along the width direction inside the channel steel frame (9). The support ribs (11) and the support plates (10) form a cross-sectional support structure.

6. The grid structure for dredging and maintenance of an inverted siphon culvert shaft according to claim 5, characterized in that: The upper end of the support plate (10) is provided with mounting holes corresponding to the number of support ribs (11) along its length direction. Each support rib (11) passes through the mounting holes on the corresponding multiple support plates (10) and is welded to the support plate (10).

7. A grid structure for dredging and maintenance of an inverted siphon culvert shaft according to claim 5 or 6, characterized in that: The support plate (10) is a flat steel bar, and the support rib (11) is a steel bar.

8. The grid structure for dredging and maintenance of an inverted siphon culvert shaft according to claim 1, characterized in that: The wellhead of the vertical shaft (1) is rectangular, and one side of the vertical shaft (1) is a vertical plane. The sewage interception port (2) is set on the vertical plane. The sewage interception port (2) is symmetrically provided with vertical mounting grooves (12). The two sides of the sewage interception grid (3) are matched with the mounting grooves (12).

9. A grid structure for dredging and maintenance of an inverted siphon culvert shaft according to claim 2, characterized in that: The two first parts of the first sub-grid (5) are of the same length, and the first part of the first sub-grid (5) is of the same length as the first part of the second sub-grid (6).

10. The grid structure for dredging and maintenance of an inverted siphon culvert shaft according to claim 1, characterized in that: The first sub-grid (5) has four sections, and the second sub-grid (6) has six sections.

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