Composite rubber waterstop and connecting method

Abstract

The invention discloses a composite rubber waterstop and belongs to the technical field of waterproofing of underground engineering, the composite rubber waterstop is provided with a rubber body, composite ribs which extend in the length direction and protrude out of the upper surface of the rubber body are symmetrically formed on the surface of the rubber body, and each composite rib is provided with an embedding cavity for containing a water swelling body. A directional deformation line enabling the interior and the exterior of the embedding cavity to be communicated is formed in the length direction of the composite rib, so that the water swelling body swells when encountering water, the deformation line expands in the radial direction, and the water stopping faces on the two sides of the deformation line are attached to concrete in the posture tending to be V-shaped; the water swelling body can break through the deformation line, so that the water stop surfaces on the two sides of the deformation line are attached to concrete in a V-shaped posture, and the purposes that it can be guaranteed that the water stop belt can be fully attached to the concrete, and efficient active sealing can be achieved are achieved.

Description

Technical Field

[0001] This invention relates to the field of waterproofing technology for underground engineering, and in particular to a composite rubber waterstop and its connection method. Background Technology

[0002] Water-swellable waterstops typically expand by ≥300% upon contact with water, and are used to fill gaps and block seepage channels. They are commonly used in construction joints, expansion joints, and reserved holes in tunnels, subway stations, and highway bridges. Moreover, ordinary rubber waterstops have excellent elastic deformation capabilities, which can adapt to dynamic gaps caused by settlement, expansion, contraction, and temperature changes in the structure. For example, in tunnel expansion joints and subway station construction joints, when the structure settles, the waterstop can always be tightly attached to the concrete base surface through its own elastic compression or stretching, thus blocking the seepage channel. Rubber waterstops and water-swellable waterstops each have their own advantages.

[0003] In existing technologies, there are also cases where two types of waterstops are used in combination. For example, a water-swellable waterstop is embedded inside a rubber waterstop and holes are made on the surface of the rubber waterstop to allow the water-swellable waterstop to come into contact with water. There are also splicing methods, in which a water-swellable waterstop is bonded to the surface of an ordinary waterstop. This combines the elastic deformation capability of the ordinary rubber waterstop with the leak-stopping advantages of water-swellable materials, which can greatly improve the reliability of waterstopping. However, both of the above methods have their drawbacks.

[0004] Embedded water-swellable sealant is often too tightly embedded, which can cause the grout to clog the openings, resulting in the sealant not coming into contact with water or expanding unevenly. This can prevent the sealant from fully adhering to the concrete. Spliced ​​sealant, on the other hand, may have loose connections and gaps, leading to potential leakage. Summary of the Invention

[0005] The purpose of this invention is to overcome the defects of the existing technology and provide a composite rubber waterstop and connection method that can both ensure that the waterstop can fully adhere to the concrete and achieve efficient active sealing.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] This invention discloses a composite rubber waterstop, comprising:

[0008] A rubber body has symmetrically formed composite ribs extending along its length and protruding from its upper surface. Each composite rib has a cavity for accommodating a water-swellable material. Furthermore, the composite ribs have directional deformation lines along their length that connect the interior and exterior of the cavity, allowing the water-swellable material to expand upon contact with water. These deformation lines expand radially, and the water-stopping surfaces on both sides of the deformation lines adhere to the concrete in a V-shaped manner.

[0009] A slow-expansion membrane is applied to the exposed portion of the water-swellable body.

[0010] Furthermore, the deformation line is a permeable slit opened at the top of the composite rib and communicating with the fitting cavity. The water-swellable body is covered inside the composite rib by the fitting cavity, and the permeable slit is provided with connecting ribs at intervals. The connecting ribs have a weak connecting part in the middle to narrow it.

[0011] Furthermore, the water-swellable body can be separated from the composite rib.

[0012] Furthermore, the deformation line is an expansion joint opened at the top of the composite rib and communicating with the fitting cavity. Part of the water-swellable body is placed inside the fitting cavity and part is placed outside the composite rib. The expansion joint is provided with locking parts on both sides for engaging or disengaging with the locking groove of the water-swellable body.

[0013] Furthermore, the cross-sectional structure of the water-swellable body is shaped like the Chinese character "" (or "T").

[0014] Furthermore, the rubber body has raised ribs formed on both sides of the composite rib.

[0015] Furthermore, the cross-section of the rubber body is symmetrically arranged around the horizontal axis.

[0016] Furthermore, the rubber body has a circular hollow cavity in the middle, and there are protruding upper and lower surfaces at the location of the circular hollow cavity.

[0017] Furthermore, the composite ribs are provided at both ends of the rubber body.

[0018] The invention discloses a connection method for the aforementioned composite rubber waterstop, the method comprising the following steps:

[0019] Cutting: The ends of two adjacent waterstops, the cuts of the rubber body end faces of the two rubber waterstops are neat and consistent, the cutting of the water-swellable body, and the connection of the interface positions of the rubber body and the water-swellable body are staggered.

[0020] Grinding: Grind the bonding surfaces of the connecting ends of the two rubber bodies to a smooth finish, removing burrs and oil stains to ensure cleanliness;

[0021] Connection: Adjacent rubber bodies are joined by cold bonding or hot vulcanization in a butt joint manner. Adjacent water-swellable bodies are joined by parallel overlapping method, in which the ends of the two water-swellable bodies are cut into butt bevels and then overlapped to bond them together.

[0022] In the above technical solution, the composite rubber waterstop provided by the present invention has the following advantages:

[0023] The composite ribs of the rubber body connect the inside and outside of the interlocking cavity through the deformation line. When the water-swellable body comes into contact with water at the deformation line position, it actively expands and breaks through the deformation line. The ribs on both sides of the deformation line can separate to both sides of the deformation line, so that the water-stopping surfaces on both sides of the composite ribs are squeezed and kept in close contact with the concrete, ensuring a reliable seal. At the same time, the water-swellable body actively stops water, and after the deformation line is broken, the expansion of the water-swellable body is more uniform, effectively blocking the seepage channel by filling the gap, so that the composite rubber waterstop achieves a highly efficient seal. Secondly, by covering the exposed position of the water-swellable body with a slow-expansion membrane, the contact time between the water-swellable body and the concrete is delayed, preventing the water-swellable body from expanding prematurely during pouring. This composite rubber waterstop achieves the purpose of both fully adhering to the concrete and efficiently and actively sealing.

[0024] The present invention provides a connection method for the above-mentioned composite rubber waterstop. The interface positions of the rubber body and the water-swellable body are connected in a staggered manner, which can effectively avoid the risk of damaging the length of the water-swellable body when processing the end of the rubber body, resulting in gaps between the two sections of the water-swellable body, forming leak points, and causing potential water leakage. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0026] Figure 1 This is a front view of a first embodiment of the composite rubber waterstop disclosed in this invention;

[0027] Figure 2 yes Figure 1 Top view;

[0028] Figure 3 yes Figure 1 Usage status diagram;

[0029] Figure 4 This is a front view of Embodiment 2 of the composite rubber waterstop disclosed in this invention;

[0030] Figure 5 yes Figure 4 Top view;

[0031] Figure 6 yes Figure 4 Usage status diagram;

[0032] Figure 7 This is a front view of Embodiment 3 of the composite rubber waterstop disclosed in this invention.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Rubber body; 2. Ribs; 3. Circular hollow cavity; 4. Composite ribs; 5. Fitting cavity; 6. Water-swellable body; 7. Water-stopping surface; 8. Seepage joint; 9. Connecting rib; 10. Weak connection part; 11. Expansion joint; 12. Locking part. Detailed Implementation

[0035] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0036] Example 1, see Figure 1-3 As shown;

[0037] An invention provides a composite rubber waterstop, comprising: a rubber body 1;

[0038] The surface of the rubber body 1 is symmetrically formed with composite ribs 4 extending along the length direction and protruding from its upper surface. The composite ribs 4 have a fitting cavity 5 for accommodating the water-swellable body 6. The composite ribs 4 are also formed with directional deformation lines along the length direction to connect the inside and outside of the fitting cavity 5. When water seeps into the deformation line, the water-swellable body 6 expands upon contact with water. The composite ribs 4 expand radially along the deformation line. The water-stopping surfaces 7 on both sides of the deformation line adhere to the concrete in a V-shaped manner. A slow-expansion membrane is covered at the exposed position of the water-swellable body to temporarily protect the water-swellable body 6.

[0039] The structure is made of a water-swellable material. The water-swellable body 6 expands actively when it comes into contact with water at the deformation line and breaks through the deformation line. The composite ribs 4 located on both sides of the deformation line can separate to both sides of the deformation line, so that the water-stopping surfaces 7 on both sides of the composite ribs 4 tend to be squeezed in a V-shape and keep in contact with the concrete. At the same time, the exposed water-swellable body 6 can also actively stop water. After the deformation line is broken through, the water-swellable body 6 expands more evenly, filling the gaps and effectively blocking the seepage channels, so that the composite rubber waterstop can achieve efficient sealing. The slow-swelling membrane is a thin film that can absorb the water during concrete pouring and slowly decompose. The slow-swelling membrane delays the contact time between the water-swellable body and the concrete, preventing the water-swellable body 6 from expanding prematurely during pouring. The slow-swelling membrane can be a protective layer integrally formed on the outside of the water-swellable body 6, or it can be covered by adhesive on the exposed position of the water-swellable body 6.

[0040] See Figure 2 As shown:

[0041] Preferably, the deformation line is a permeation slit 8 opened at the top of the composite rib 4 and communicating with the fitting cavity 5. The water-swellable body 6 is covered inside the composite rib 4 by the fitting cavity 5, and the permeation slit 8 is provided with connecting ribs 9 at intervals. The connecting rib 9 has a weak connection part 10 in the middle to narrow it. The weak connection part 10 can be a V-shaped fracture groove or other tearing structure that can narrow the connecting rib 9 and tear it at this position after being stretched. This structure extends along the length of the composite rib 4 at the top through the permeation slit 8. After the water-swellable body 6 expands when exposed to water, the connecting rib 9 has a certain elasticity. In order to make it easy to break, a weak connection is provided in the middle to guide it to be torn. In this structure, the fitting cavity 5 completely covers the water-swellable body 6 inside the cavity, effectively protecting the water-swellable body 6, preventing it from falling off, and reducing the phenomenon of accidental water swelling.

[0042] Preferably, the rubber body 1 has raised ribs 2 on both sides of the composite rib 4. By adding multiple raised ribs 2, it can form a mechanical interlock with the concrete and achieve multiple seals. Moreover, the design of the raised ribs 2 can effectively extend the water seepage path and destroy capillary permeability.

[0043] Preferably, the cross-section of the rubber body 1 is symmetrically arranged with respect to the horizontal axis, and the middle of the rubber body 1 has a circular hollow cavity 3. The circular hollow cavity 3 has a protruding upper surface and a lower surface. That is to say, the waterstop is a centrally embedded waterstop. The circular hollow cavity 3 structure absorbs deformation and improves the sealing performance.

[0044] Example 2, see Figure 4-6 As shown:

[0045] This embodiment is basically the same as the first embodiment, except that: in this embodiment, the water-swellable body 6 can be separated from the composite rib 4, so that the water-swellable body 6 and the waterstop rubber body 1 can be decomposed and stored separately as independent individuals. When used, they are assembled together to facilitate the individual protection of the water-swellable body 6.

[0046] The deformation line is an expansion joint 11 opened at the top of the composite rib 4 and connected to the fitting cavity 5. Part of the water-swellable body 6 is placed inside the fitting cavity 5 and part is placed outside the composite rib 4. The expansion joint 11 is provided with locking parts 12 on both sides for locking or separating with the locking groove of the water-swellable body 6. In this structure, the top of the composite rib 4 has an expansion joint 11 extending from one end of the rubber body 1 to the other end. The expansion joint 11 is connected to the fitting cavity 5, and protruding locking parts 12 are formed on both sides of the expansion joint 11. The locking parts 12 are inserted into the locking grooves on both sides of the water-swellable body 6, thereby locking the water-swellable body 6. The cross-sectional structure of the water-swellable body 6 is shaped like an "8". The locking groove is formed at the narrowing position in the middle of the "8" shaped structure, which is adapted to the locking part 12. The two circular diameters of the "8" shaped structure can be unequal. The part with the slightly smaller diameter is placed in the fitting cavity 5 for easy assembly. During assembly, the expansion joint 11 is widened, and part of the water-swellable body 6 is inserted into the fitting cavity 5, while part is exposed outside the composite rib 4. After assembly, the expansion joint 11 is reset, and the locking parts 12 are locked in the locking grooves of the water-swellable body 6, and the water-swellable body 6 is fixed on the composite rib 4.

[0047] Example 3, see Figure 7 As shown:

[0048] This embodiment is basically the same as Embodiment 1, except that: composite ribs 4 are provided at both ends of the rubber body 1. In this structure, by providing composite ribs 4 at the ends of the rubber body 1, and by utilizing the expansion of the water-swellable body 6 in the interlocking cavity 5 of the composite ribs 4, the upper and lower water-stopping surfaces 7 at both ends of the rubber body 1 can be actively pressed, which not only achieves mechanical interlocking with the concrete and physical blocking, but also further extends the seepage path;

[0049] A method for connecting the above-mentioned composite rubber waterstop is invented, the method comprising the following steps:

[0050] Cutting: The cuts on the ends of the rubber bodies 1 of the two adjacent waterstops are neat and consistent. The water-swellable body 6 is cut, and the interface positions of the rubber body 1 and the water-swellable body 6 are staggered. Specifically, a section of the water-swellable body 6 of one waterstop is reserved so that its length is greater than the length of the rubber body 1. A section of the water-swellable body 6 of the other waterstop is cut off, and the length of the cut water-swellable body 6 is the same as the length of the reserved water-swellable body 6. Since the water-swellable body 6 is embedded in the fitting cavity 5, a section of the water-swellable body 6 can be reserved using the seepage joint 8 and the expansion joint 11. The rubber body 1 and the water-swellable body 6 can be connected in a staggered manner at the interface position, which can avoid damaging the length of the water-swellable body 6 when processing the end of the rubber body 1, resulting in a gap between the two sections of the water-swellable body 6, forming a leak point, and causing a water leakage hazard.

[0051] Grinding: Grind the bonding surfaces of the connecting ends of the two rubber bodies 1 until smooth, removing burrs and oil stains to ensure cleanliness;

[0052] Connection: Adjacent rubber bodies 1 are connected by cold bonding or hot vulcanization in a butt joint manner. Adjacent water-swellable bodies 6 are connected by parallel overlapping method. The ends of the two water-swellable bodies 6 are cut into butt bevels, and then they are bonded by overlapping each other. The overlap length is 50-150mm. Adhesive is used to cold bond the overlapping bevels of the water-swellable bodies 6 at the joint position and between the water-swellable bodies 6 and the rubber body 1. The cold bonding or hot vulcanization connection can use conventional connection methods in the existing technology.

[0053] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A composite rubber waterstop, characterized in that, include: A rubber body (1) has symmetrically formed composite ribs (4) extending along its length and protruding from its upper surface. The composite ribs (4) have fitting cavities (5) for accommodating a water-swellable body (6), and the composite ribs (4) have directional deformation lines along their length that connect the interior and exterior of the fitting cavities (5) so that the water-swellable body (6) expands upon contact with water. The deformation lines extend radially, and the water-stopping surfaces (7) on both sides of the deformation lines adhere to the concrete in a V-shaped manner. A slow-expanding membrane is applied to the exposed portion of the water-swellable body (6).

2. The composite rubber waterstop according to claim 1, characterized in that: The deformation line is a permeation slit (8) opened at the top of the composite rib (4) and connected to the fitting cavity (5). The water-swellable body (6) is covered inside the composite rib (4) by the fitting cavity (5), and the permeation slit (8) is provided with connecting ribs (9) at intervals. The connecting ribs (9) have a weak connecting part (10) in the middle that narrows them.

3. The composite rubber waterstop according to claim 1, characterized in that: The water-swellable body (6) can be separated from the composite rib (4).

4. The composite rubber waterstop according to claim 3, characterized in that: The deformation line is an expansion joint (11) opened on the top of the composite rib (4) and connected to the fitting cavity (5). Part of the water-swellable body (6) is placed inside the fitting cavity (5) and part is placed outside the composite rib (4). The expansion joint (11) is provided with locking parts (12) on both sides for locking or separating with the locking groove of the water-swellable body (6).

5. The composite rubber waterstop according to claim 4, characterized in that: The cross-sectional structure of the water-swellable body (6) is shaped like the number "8".

6. The composite rubber waterstop according to claim 1, characterized in that: The rubber body (1) has raised ribs (2) on both sides of the composite rib (4).

7. The composite rubber waterstop according to claim 6, characterized in that: The cross-section of the rubber body (1) is symmetrically arranged with respect to the horizontal axis.

8. The composite rubber waterstop according to claim 6, characterized in that: The rubber body (1) has a circular hollow cavity (3) in the middle, and has a protruding upper surface and lower surface at the position of the circular hollow cavity (3).

9. The composite rubber waterstop according to any one of claims 1-8, characterized in that: The composite ribs (4) are provided at both ends of the rubber body (1).

10. A method for connecting the composite rubber waterstop as described in any one of claims 1-9, characterized in that, The method includes the following steps: Cutting: The ends of the rubber bodies (1) of the two adjacent waterstops are cut neatly and uniformly. The water-swellable body (6) is cut and the interface positions of the rubber body (1) and the water-swellable body (6) are connected in a staggered manner. Grinding: Grind the bonding surfaces of the connecting ends of the two rubber bodies (1) to a smooth finish, removing burrs and oil stains to ensure cleanliness; Connection: Two adjacent rubber bodies (1) are connected by cold bonding or hot vulcanization in the form of butt joint. Two adjacent water-swellable bodies (6) are connected by parallel overlapping method. The ends of the two water-swellable bodies (6) are cut into butt bevels and then overlapped and bonded.

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