Large-span open channel counterfort retaining wall
By setting a zigzag joint between the cantilever retaining wall and the channel bottom slab and filling it with hard and soft materials, the problem of excessive mid-span bending moment of the channel bottom slab in large spans was solved, achieving stable force transmission and water-stopping functions under large span conditions, and meeting the design requirements for anti-tilting stability and anti-sliding stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HUBEI PROVINCIAL WATER RESOURCES & HYDROPOWER PLANNING SURVEY & DESIGN INST
- Filing Date
- 2025-08-20
- Publication Date
- 2026-07-21
AI Technical Summary
When the width of the canal bottom is large, the bending moment at the mid-span of the canal bottom slab of the existing cantilever retaining wall is too large, resulting in a huge amount of reinforcement in the bottom slab. The overall U-shaped channel structure becomes infeasible. Moreover, under the condition of poor foundation and backfill geological parameters, the design is difficult to meet the requirements of anti-overturning stability and anti-sliding stability.
A top-mounted retaining wall for a large-span open channel is designed. By setting a zigzag joint between the cantilever retaining wall and the channel bottom slab, the upper part of the joint is filled with a hard sealant, and the lower part is filled with a soft sealant and a waterstop, ensuring uniform force transmission and water-stopping function.
The width of the channel bottom slab was reduced, the mid-span bending moment of the channel bottom slab was lowered, and stable force transmission was achieved under large span conditions. This avoided local concrete crushing and waterstop failure, and met the design requirements for anti-tilting stability and anti-sliding stability.
Smart Images
Figure CN224531590U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of hydraulic retaining wall technology, specifically to a top-mounted retaining wall for a large-span open channel. Background Technology
[0002] Retaining walls are widely used in water conservancy projects, such as guide walls at the entrances and exits of various structures and canal sidewalls. Retaining walls are classified according to their structural characteristics into gravity retaining walls, cantilever retaining walls, and slope-adhering retaining walls, each with its own advantages and disadvantages. Retaining wall design must ensure that it meets relevant specifications under various design conditions. This includes meeting requirements for overturning stability, sliding stability, average base stress less than the allowable bearing capacity, and ensuring that the ratio of the maximum to minimum base stress (base stress non-uniformity coefficient) is not too large. Since these requirements are sometimes contradictory, the design process involves adjustments and calculations to the dimensions of various parts of the retaining wall.
[0003] For retaining walls with low friction coefficients at the base (such as canal walls in vast plains and lake areas where clay strata are widely distributed, the friction coefficient at the base of the wall is only 0.2~0.25, the backfill material can only be local soil, the internal friction angle of the backfill is only about 10°~25°, and the foundation bearing capacity is not high, only 120~150kPa), cantilever retaining walls are generally used. Cantilever retaining walls have advantages such as simple structure, light weight, and cost savings. By adjusting the length of the toe plate and heel plate, it is easy to find the dimensions that meet the foundation bearing capacity requirements. If the width of the canal bottom is small, the retaining walls on both sides and the canal bottom plate can be combined into a U-shaped channel structure, so that the backfill pressure behind the retaining walls on both sides can be offset by the canal bottom plate. However, if the canal bottom is wide, the overall U-shaped channel structure will be subjected to the reaction force of the foundation. The bending moment at the mid-span of the canal bottom plate is proportional to the square of the span. At this time, the bending moment at the mid-span is too large, resulting in a huge amount of reinforcement in the bottom plate, making this kind of integral U-shaped channel structure infeasible. Utility Model Content
[0004] The purpose of this utility model is to address the shortcomings of existing technologies by providing a top-mounted retaining wall for large-span open channels. This expands the applicability of the U-shaped channel structure formed by the retaining wall and the channel bottom slab, making it applicable even when the channel bottom width is too large, the excavation and slope of the back side of the retaining wall are limited, the heel slab cannot be lengthened arbitrarily, and the geological parameters of the foundation and backfill are poor.
[0005] To address the aforementioned technical problems, this utility model provides a top-mounted retaining wall for a large-span open channel, comprising a channel bottom slab, cantilever retaining walls on both sides of the channel bottom slab, a joint between the channel bottom slab and the cantilever retaining walls, the joint being zigzag-shaped, the upper part of the joint being vertically arranged, the upper part of the joint being filled with a rigid sealant, the rigid sealant being used for force transmission between the cantilever retaining walls and the channel bottom slab, the lower part of the joint being filled with a soft sealant, and a waterstop being provided at the lower part of the joint.
[0006] In some embodiments, the seam includes an upper vertical seam, a horizontal seam, and a lower vertical seam, wherein the upper vertical seam and the lower vertical seam are staggered and connected by a horizontal seam.
[0007] In some embodiments, the channel bottom plate includes a central flat plate, and the cantilever retaining wall includes a vertical wall and a wall base plate, wherein the upper surface of the wall base plate is flush with the upper surface of the central flat plate.
[0008] In some embodiments, the joint between the central plate and the wall base plate is the upper vertical seam.
[0009] In some embodiments, a first protrusion is provided at the bottom of the wall base plate, the first protrusion is arranged close to the central plate, a second protrusion is provided at the bottom of the central plate, one end of the second protrusion extends outward to both sides of the central plate and abuts against the first protrusion, and the abutment point between the second protrusion and the first protrusion is the lower vertical seam.
[0010] In some embodiments, the horizontal seam is between the upper surface of the second protrusion and the lower surface of the wall base plate.
[0011] In some embodiments, the upper surface of the second protrusion is brushed with asphalt or covered with a plastic film.
[0012] In some embodiments, the wall base plate includes a heel plate and a toe plate located on both sides of the bottom of the wall, the toe plate abutting against the central flat plate, and the length of the heel plate being less than the length of the toe plate.
[0013] The beneficial effects of this utility model are as follows:
[0014] 1. This utility model reduces the width of the channel bottom slab by setting a joint between the cantilever retaining wall and the channel bottom slab, thereby reducing the mid-span bending moment of the channel bottom slab, so that the U-shaped channel structure formed by the retaining wall and the channel bottom slab can be used when the channel bottom width is too large.
[0015] 2. In this utility model, an upper vertical joint is provided between the wall base plate and the middle flat plate. The upper vertical joint is filled with a rigid joint filler material. The rigid joint filler material can transfer and mutually offset the soil pressure on the back side of the two cantilever retaining walls, while ensuring that the joint surface is flat and the force is transmitted evenly, and avoiding sharp corners of the concrete at the joint from being crushed.
[0016] 3. The lower vertical seam of this utility model is filled with soft sealant, which can ensure that the waterstop plate works normally without being flattened.
[0017] 4. This utility model ensures that the upper surfaces of the middle plate and the bottom plate of the wall are flush by brushing asphalt or applying plastic film to the upper surface of the second protrusion. Attached Figure Description
[0018] Figure 1 This is a perspective view of the present utility model;
[0019] Figure 2 This is a cross-sectional view of the present invention;
[0020] Figure 3 This is a detailed view of the seam of this utility model.
[0021] Reference numerals: 1. Channel bottom plate; 11. Middle plate; 12. Second protrusion; 2. Cantilever retaining wall; 21. Vertical wall; 22. Wall base plate; 221. Heel plate; 222. Toe plate; 223. First protrusion; 3. Joint; 31. Upper vertical joint; 32. Horizontal joint; 33. Lower vertical joint; 4. Waterstop plate. Detailed Implementation
[0022] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.
[0023] like Figure 1 As shown, this utility model provides a top-mounted retaining wall for a large-span open channel, including a channel bottom slab 1, with cantilever retaining walls 2 on both sides of the channel bottom slab 1. The channel bottom slab 1 and the two cantilever retaining walls 2 form a U-shaped channel structure. Figure 2As shown, a joint 3 is provided between the channel bottom slab 1 and the cantilever retaining wall 2. The joint 3 is zigzag-shaped, with the upper part of the joint 3 arranged vertically. The upper part of the joint 3 is filled with a rigid mortar material, which is used to transfer forces between the cantilever retaining wall 2 and the channel bottom slab 1. The lower part of the joint 3 is filled with a soft mortar material, and a waterstop 4 is installed at the lower part of the joint 3. The rigid mortar material can be a metal plate or a rigid plastic plate, such as PVC, PE, EP (epoxy plastic), PF (phenolic plastic), PS (polystyrene), etc. The soft mortar material can be a commonly used mortar foam board, such as polyethylene closed-cell mortar foam board. The waterstop 4 is a PVC waterstop, a rubber waterstop, or a copper waterstop. Both ends of the waterstop 4 are pre-embedded in the channel bottom slab 1 and the cantilever retaining wall 2, respectively.
[0024] Understandably, by setting the joint 3, the width of the channel bottom slab 1 is reduced, thereby reducing the mid-span bending moment of the channel bottom slab 1, avoiding excessive reinforcement, and enabling the U-shaped channel structure formed by the retaining wall and the channel bottom slab 1 to be used when the channel bottom width is too large. By setting an upper vertical joint 31 between the wall bottom slab 22 and the middle flat plate 11, the upper vertical joint 31 is filled with a rigid sealant. The rigid sealant can transfer and mutually offset the soil pressure on the back side of the two cantilever retaining walls 2, while ensuring that the joint 3 surface is flat and the force is transmitted evenly, avoiding the formation of sharp corners in the concrete at the joint 3 and causing damage. By setting a soft sealant in the lower vertical joint 33, the waterstop plate 4 can be ensured to work normally without being flattened.
[0025] like Figure 3 As shown, the seam 3 includes an upper vertical seam 31, a horizontal seam 32, and a lower vertical seam 33. The upper vertical seam 31 and the lower vertical seam 33 are staggered and connected by the horizontal seam 32.
[0026] like Figure 2 As shown, the channel bottom plate 1 includes a central flat plate 11, and the cantilever retaining wall 2 includes a vertical wall 21 and a wall bottom plate 22. The upper surface of the wall bottom plate 22 is flush with the upper surface of the central flat plate 11.
[0027] like Figure 3 As shown, the joint between the middle plate 11 and the wall base plate 22 is the upper vertical seam 31. The bottom of the wall base plate 22 is provided with a first protrusion 223, which is arranged close to the middle plate 11. The bottom of the middle plate 11 is provided with a second protrusion 12, one end of which extends outward from both sides of the middle plate 11 and abuts against the first protrusion 223. The joint between the second protrusion 12 and the first protrusion 223 is the lower vertical seam 33.
[0028] It is understandable that the joint between the middle plate 11 and the wall base plate 22 is the upper vertical joint 31. The height of the upper vertical joint 31 is equal to the thickness of the middle plate 11, which ensures the stable transmission of force between the cantilever retaining wall 2 and the channel base plate 1.
[0029] like Figure 3 As shown, there is a horizontal seam 32 between the upper surface of the second protrusion 12 and the lower surface of the wall base plate 22. The upper surface of the second protrusion 12 is brushed with asphalt or covered with plastic film to ensure that the upper surfaces of the middle plate 11 and the wall base plate 22 are flush.
[0030] like Figure 2 As shown, the wall base slab 22 includes a heel plate 221 and a toe plate 222 located on both sides of the bottom of the vertical wall 21. The toe plate 222 abuts against the central flat plate 11, and the length of the heel plate 221 is less than the length of the toe plate 222. It should be noted that when there are restrictions on the excavation and slope of the back side of the cantilever retaining wall 2 and the heel plate 221 cannot be lengthened arbitrarily, the length of the heel plate 221 on the back side of the two vertical walls 21 can be significantly shortened, and the length of the toe plate 222 on the exposed side of the vertical wall 21 can be appropriately adjusted so that the stress unevenness coefficient of the base of the cantilever retaining wall 2 meets the requirements of the specification.
[0031] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.
Claims
1. A top-mounted retaining wall for a large-span open channel, characterized in that: The system includes a channel bottom plate (1), cantilever retaining walls (2) on both sides of the channel bottom plate (1), and a joint (3) between the channel bottom plate (1) and the cantilever retaining walls (2). The joint (3) is zigzag-shaped, with the upper part of the joint (3) arranged vertically. The upper part of the joint (3) is filled with a hard sealant, which is used for force transmission between the cantilever retaining walls (2) and the channel bottom plate (1). The lower part of the joint (3) is filled with a soft sealant, and a waterstop plate (4) is installed at the lower part of the joint (3).
2. The large-span open channel top-type retaining wall according to claim 1, characterized in that: The seam (3) includes an upper vertical seam (31), a horizontal seam (32), and a lower vertical seam (33). The upper vertical seam (31) and the lower vertical seam (33) are staggered and connected by the horizontal seam (32).
3. The large-span open channel top-type retaining wall according to claim 2, characterized in that: The channel bottom plate (1) includes a central plate (11), and the cantilever retaining wall (2) includes a vertical wall (21) and a wall bottom plate (22). The upper surface of the wall bottom plate (22) is flush with the upper surface of the central plate (11).
4. The large-span open channel top-type retaining wall according to claim 3, characterized in that: The joint between the middle plate (11) and the wall base plate (22) is the upper vertical seam (31).
5. The large-span open channel top-type retaining wall according to claim 3, characterized in that: The bottom of the wall base plate (22) is provided with a first protrusion (223), the first protrusion (223) is arranged close to the middle plate (11), the bottom of the middle plate (11) is provided with a second protrusion (12), one end of the second protrusion (12) extends outward to both sides of the middle plate (11) and abuts against the first protrusion (223), the abutment of the second protrusion (12) and the first protrusion (223) is the lower vertical seam (33).
6. The large-span open channel top-type retaining wall according to claim 5, characterized in that: The horizontal seam (32) is between the upper surface of the second protrusion (12) and the lower surface of the wall base plate (22).
7. The large-span open channel top-type retaining wall according to claim 6, characterized in that: The upper surface of the second protrusion (12) is brushed with asphalt or covered with a plastic film.
8. The large-span open channel top-type retaining wall according to claim 3, characterized in that: The wall base plate (22) includes a heel plate (221) and a toe plate (222) located on both sides of the bottom of the vertical wall (21). The toe plate (222) abuts against the central flat plate (11). The length of the heel plate (221) is less than the length of the toe plate (222).