A soil retaining wall expansion joint sealing component
By employing a three-layer structure sealing component and a Z-shaped steel plate design in the expansion joints of concrete retaining walls, the problem of poor waterproofing effect of the sealing components under dynamic deformation was solved, achieving efficient soil and water conservation and long-term sealing effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HEILONGJIANG UNIV
- Filing Date
- 2025-05-08
- Publication Date
- 2026-07-07
AI Technical Summary
The sealing components of existing concrete retaining wall expansion joints are prone to plastic deformation under the action of thermal expansion and contraction and foundation settlement, resulting in poor sealing effect. They are also prone to deformation during installation and cannot effectively waterproof.
The sealing components employ a three-layer structure, including a waterproof layer, an elastic support layer, and an anti-aging layer. These layers are combined with a protective steel plate and a semi-circular arc surface to form a Z-shaped distribution. The components are fixed by bolts and welded steel plates, creating a "rigid yet flexible" sealing system. The system utilizes expansion water-stop strips and closed-cell foamed neoprene rubber material to achieve high resilience and secondary sealing.
It maintains long-term waterproof performance under dynamic deformation, resists sun and rain erosion and acid and alkali corrosion, reduces seal deformation, and provides high-efficiency sealing performance.
Smart Images
Figure CN224468427U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of sealing components for expansion joints of retaining walls, specifically a sealing component for expansion joints of retaining walls used in soil and water conservation. Background Technology
[0002] Concrete retaining walls are widely used in civil engineering, primarily serving to prevent soil instability, protect buildings and facilities, and restrict soil movement. Expansion joints in concrete retaining walls are used to address the shrinkage and expansion of concrete structures due to changes in external factors such as temperature and humidity. To prevent moisture from entering the expansion joints, they must be sealed and waterproofed.
[0003] Existing sealing components involve coating the expansion joints of concrete retaining walls with waterproof materials to achieve a waterproof effect, then using polyethylene closed-cell foam boards as the expansion joint material. The expansion of the foam fills the pores and cracks, and polyurethane adhesive is injected into the front of the expansion joint to achieve a sealing effect. However, in actual use, because the width of the expansion joint is generally 2-4 cm, and the compression rebound rate of the closed-cell foam board is usually less than 70%, it is prone to plastic deformation under the combined effects of thermal expansion and contraction of concrete (±10 mm / m) and foundation settlement (±5 mm), leading to joint delamination and loss of sealing effect. Furthermore, polyethylene closed-cell foam boards are soft materials, and tools are needed to squeeze the polyethylene closed-cell foam boards into the gaps during installation, which can easily cause deformation of the polyethylene closed-cell foam boards, resulting in poor sealing effect. Therefore, it is necessary to improve the sealing component for expansion joints of soil and water conservation retaining walls to solve the above problems. Utility Model Content
[0004] The purpose of this utility model is to provide a sealing component for the expansion joint of a retaining wall for soil and water conservation, so as to solve the problems mentioned in the background art.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a sealing component for expansion joints of retaining walls for soil and water conservation, comprising a retaining wall and a protective steel plate, wherein an mounting steel plate is fixedly installed on the front side of the protective steel plate, and a semi-circular arc surface is fixedly installed on the back side of the protective steel plate, the mounting steel plate is threadedly installed on the front side of the retaining wall by fixing bolts, a welded steel plate is provided on the front side of the fixing bolts, and a sealing element is provided on the inner side of the protective steel plate.
[0006] Preferably, the mounting steel plate and the semi-circular arc surface are respectively disposed at both ends of the protective steel plate, and the protective steel plate, the mounting steel plate and the semi-circular arc surface are distributed in a Z-shape with a bending angle of 90°.
[0007] Preferably, the protective steel plate, the mounting steel plate, and the semi-circular arc surface are each provided in two sets, and the two sets of protective steel plates are fitted to the inner walls on both sides of the expansion joint.
[0008] Preferably, the welded steel plate is fixedly installed on the outside of the two mounting steel plates by welding, and the center of the welded steel plate is arc-shaped.
[0009] Preferably, the fixing steel plate is provided with a waterproof layer, an elastic support layer and an anti-aging layer from the inside out.
[0010] Preferably, the waterproof layer is made of an expansion stop strip with an expansion rate of ≥300%, the elastic support layer is made of closed-cell foamed neoprene rubber, the anti-aging layer is made of EPDM rubber, and a 0.5mm thick PTFE membrane is provided between the elastic support layer and the waterproof layer.
[0011] Compared with the prior art, this utility model provides a sealing component for expansion joints of retaining walls for soil and water conservation, which has the following beneficial effects:
[0012] 1. This soil and water conservation retaining wall expansion joint sealing component, during use, features an anti-aging layer that resists sun exposure, rainwater erosion, and acid and alkali corrosion; an elastic support layer that provides high resilience and absorbs the compression deformation of the expansion joint; and a waterproof layer with a volume expansion rate of ≥300% after absorbing water, filling gaps and forming a secondary seal. The three-layer structure is formed by co-extrusion molding or hot-press bonding, creating a "rigid and flexible" sealing system that can adapt to dynamic deformation and provide long-term waterproofing.
[0013] 2. In the process of use, the protective steel plate, the mounting steel plate, and the semi-circular arc surface of this soil and water conservation retaining wall expansion joint sealing component are distributed in a Z-shape and set inside the expansion joint of the retaining wall for guiding operation. The sealing component is also equipped with a fixing steel plate inside to support the sealing component and prevent compression deformation. The fixing steel plate acts as a skeleton to maintain the shape of the sealing component, while allowing the elastic material to play its role and reducing the installation deformation rate of the sealing component. Attached Figure Description
[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0015] Figure 1 This is a schematic diagram of the appearance and structure of this utility model;
[0016] Figure 2 This is a schematic diagram of the top structure of this utility model;
[0017] Figure 3 This is a schematic diagram of the internal structure of the sealing component of this utility model.
[0018] In the diagram: 1. Retaining wall; 2. Protective steel plate; 3. Installed steel plate; 4. Semi-circular arc surface; 5. Fixing bolts; 6. Welded steel plate; 7. Sealing element; 71. Fixing steel plate; 72. Waterproof layer; 73. Elastic support layer; 74. Anti-aging layer. Detailed Implementation
[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0020] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0021] Example:
[0022] Please see Figure 1-3 This utility model provides a technical solution: a sealing component for the expansion joint of a retaining wall for soil and water conservation, including a retaining wall 1 and a protective steel plate 2. A mounting steel plate 3 is fixedly installed on the front of the protective steel plate 2, and a semi-circular arc surface 4 is fixedly installed on the back of the protective steel plate 2. The mounting steel plate 3 is threadedly installed on the front of the retaining wall 1 by fixing bolts 5. A welded steel plate 6 is provided on the front of the fixing bolts 5. A sealing element 7 is provided on the inner side of the protective steel plate 2. The protective steel plate 2, the mounting steel plate 3, and the semi-circular arc surface 4 are arranged in a Z-shape and are set inside the expansion joint of the retaining wall for guiding operation, which facilitates the installation operation of the sealing element 7.
[0023] Furthermore, the mounting steel plate 3 and the semi-circular arc surface 4 are respectively set at both ends of the protective steel plate 2, and the protective steel plate 2, the mounting steel plate 3 and the semi-circular arc surface 4 are distributed in a Z shape with a bending angle of 90°, which facilitates the fixing operation of the device.
[0024] Furthermore, two sets of protective steel plates 2, mounting steel plates 3, and semi-circular arc surfaces 4 are provided, and the two sets of protective steel plates 2 are fitted to the inner walls on both sides of the expansion joint.
[0025] Furthermore, the welded steel plate 6 is fixedly installed on the outside of the two mounting steel plates 3 by welding. The center of the welded steel plate 6 is arc-shaped to facilitate dynamic deformation.
[0026] Furthermore, the fixed steel plate 71 is provided with a waterproof layer 72, an elastic support layer 73 and an anti-aging layer 74 from the inside out. The three-layer structure is formed by co-extrusion molding or hot-press bonding to form a "rigid and flexible" sealing system that can adapt to dynamic deformation and provide long-term waterproofing.
[0027] Furthermore, the waterproof layer 72 is made of an expansion stop strip with an expansion rate of ≥300%, the elastic support layer 73 is made of closed-cell foamed neoprene rubber, and the anti-aging layer 74 is made of EPDM rubber. A 0.5mm thick PTFE membrane is placed between the elastic support layer 73 and the waterproof layer 72. The anti-aging layer 74 resists sunlight, rain erosion, and acid and alkali corrosion. The elastic support layer 73 provides high resilience and absorbs the extrusion deformation of the expansion joint. The waterproof layer 72 has a volume expansion rate of ≥300% after absorbing water, filling the gaps and forming a secondary seal.
[0028] In actual operation, when this device is used, two protective steel plates 2 are inserted into the expansion joint from the top of the retaining wall 1 and fit against the inner walls on both sides of the expansion joint. The mounting steel plate 3 is threaded into the inside of the retaining wall 1 using fixing bolts 5. The sealing element 7 is inserted into the middle gap from the top of the two protective steel plates 2. The welding steel plate 6 is placed on the front of the sealing element 7 and the sealing element 7 is welded to the front of the mounting steel plate 3 to protect the sealing element 7. Then, polyurethane glue is injected between the two semi-circular surfaces 4 to complete the sealing operation of the expansion joint.
[0029] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
Claims
1. A sealing component for expansion joints of retaining walls used for soil and water conservation, comprising a retaining wall (1) and a protective steel plate (2), characterized in that: The protective steel plate (2) has a mounting steel plate (3) fixedly installed on its front side, and a semi-circular arc surface (4) fixedly installed on its back side. The mounting steel plate (3) is threadedly installed on the front side of the retaining wall (1) by fixing bolts (5). A welded steel plate (6) is provided on the front side of the fixing bolts (5), and a sealing element (7) is provided on the inner side of the protective steel plate (2).
2. The sealing component for expansion joints of retaining walls for soil and water conservation according to claim 1, characterized in that: The mounting steel plate (3) and the semi-circular arc surface (4) are respectively set at both ends of the protective steel plate (2), and the protective steel plate (2), the mounting steel plate (3) and the semi-circular arc surface (4) are distributed in a Z shape with a bending angle of 90°.
3. The sealing component for expansion joints of retaining walls for soil and water conservation according to claim 1, characterized in that: The protective steel plate (2), the mounting steel plate (3) and the semi-circular arc surface (4) are all provided in two sets, and the two sets of protective steel plates (2) are attached to the inner walls on both sides of the expansion joint.
4. The sealing component for expansion joints of retaining walls for soil and water conservation according to claim 1, characterized in that: The welded steel plate (6) is fixedly installed on the outside of the two mounting steel plates (3) by welding, and the center of the welded steel plate (6) is arc-shaped.
5. A sealing component for expansion joints of retaining walls for soil and water conservation according to claim 1, characterized in that: The sealing element (7) includes a fixed steel plate (71), which is provided with a waterproof layer (72), an elastic support layer (73) and an anti-aging layer (74) from the inside to the outside.
6. A sealing component for expansion joints of retaining walls for soil and water conservation according to claim 5, characterized in that: The waterproof layer (72) is made of an expansion stop strip with an expansion rate of ≥300%. The elastic support layer (73) is made of closed-cell foamed neoprene rubber. The anti-aging layer (74) is made of EPDM rubber. A 0.5mm thick PTFE membrane is provided between the elastic support layer (73) and the waterproof layer (72).