A new composite waterstop

Abstract

A new composite waterstop, comprising a base plate, characterized in that the cross section of the base plate is a multilayer composite structure symmetrical in upper and lower layers, the middle layer of the multilayer composite structure is a wave-shaped rubber base layer (1), the upper and lower layers of the wave-shaped rubber base layer are each covered with a water-swelling rubber layer (2), and the surface of the water-swelling rubber layer is provided with a non-woven fabric reinforcing layer (3). The new composite waterstop has the advantages that physical sealing and chemical sealing are integrated, the layers cooperate with each other, the sealing reliability, self-adaptability and durability of the waterstop are remarkably improved, and the new composite waterstop is particularly suitable for underground engineering with extremely high waterproof requirements.

Description

Technical Field

[0001] This utility model belongs to the field of building waterproofing technology, specifically, it is a new type of composite waterstop. Background Technology

[0002] Waterstops are crucial components for preventing leakage at building structural joints. Traditional waterstops mainly include rubber waterstops, steel-edged rubber waterstops, and water-swellable waterstops. Each type of product has its limitations: Rubber waterstops rely on their elastic compression to achieve a physical sealing effect, but they have high requirements for the quality of the concrete pouring interface. If there are minor defects at the interface or gaps are generated due to vibration, seepage channels can easily form.

[0003] Water-swellable sealing strips: They expand in volume when exposed to water and can actively seal gaps. However, their expansion ratio is limited, and they suffer from problems such as relaxation of expansion stress and poor water resistance under long-term water pressure. Their reliability is insufficient when used alone.

[0004] To address these issues, composite waterstops combining physical rubber and water-swellable materials have emerged on the market. However, existing composite waterstops often employ simple layering processes, resulting in weak interlayer bonding and susceptibility to delamination failure under long-term water pressure and structural deformation. Furthermore, their physical waterstop structure has limited adaptability to deformation and lacks reinforcement measures, thus their durability needs improvement. Therefore, developing a novel composite waterstop that combines the advantages of physical elasticity and chemical expansion, with strong interlayer bonding and greater adaptability, is of great significance. Utility Model Content

[0005] The purpose of this invention is to propose a safe and reliable new composite waterstop.

[0006] To achieve the above objectives, the technical solution of this utility model is: A novel composite waterstop strip, comprising a substrate, characterized in that: The substrate has a cross-section of a multi-layer composite structure with symmetrical upper and lower layers. The middle layer of the multi-layer composite structure is a corrugated rubber base layer. The upper and lower layers of the corrugated rubber base layer are each covered with a water-swellable rubber layer. The surface of the water-swellable rubber layer is provided with a non-woven fabric reinforcement layer.

[0007] The novel composite waterstop of this utility model can also be further realized by the following technical measures.

[0008] The aforementioned novel composite waterstop has a water-swellable rubber layer with a thickness of 2-4 mm.

[0009] The aforementioned novel composite waterstop, wherein the nonwoven reinforcement layer is polyester nonwoven fabric or polypropylene nonwoven fabric.

[0010] In the aforementioned novel composite waterstop, the unit area mass of the polyester nonwoven fabric or polypropylene nonwoven fabric is 50-150 g / m².

[0011] By adopting the above technical solution, the novel composite waterstop of this utility model integrates physical sealing and chemical sealing, with each layer working synergistically, which significantly improves the sealing reliability, adaptability and durability of the waterstop, making it particularly suitable for underground projects with extremely high waterproofing requirements. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of the novel composite waterstop according to an embodiment of the present invention.

[0013] In the diagram: 1. Corrugated rubber base layer; 2. Water-swellable rubber layer; 3. Composite non-woven fabric reinforcement material. Detailed Implementation

[0014] The present invention will be further described below with reference to the embodiments and accompanying drawings. Example

[0015] The novel composite waterstop of this utility model has a symmetrical multi-layer composite structure in cross-section, which includes, from the inside to the outside: a corrugated rubber base layer 1 in the middle, a water-swellable rubber layer 2 covering the upper and lower sides of the corrugated rubber base layer, and a non-woven fabric reinforcing layer 3 covering the outer surface of the water-swellable rubber layer.

[0016] Please see now Figure 1 , Figure 1 This is a schematic diagram of the novel composite waterstop structure according to an embodiment of the present invention. As shown in the figure, the corrugated rubber base layer 1 has a continuously undulating corrugated structure with a peak-to-trough distance of 5-10 mm and a wave height of 2-5 mm. The corrugated rubber base layer 1 can generate a larger elastic deformation range during concrete pouring and structural deformation to enhance the elastic deformation capability of the waterstop, effectively filling and pressing the concrete gaps to form a reliable first physical sealing barrier.

[0017] The water-swellable rubber layer 2 is 3mm thick and is made by blending and vulcanizing water-absorbing resin, rubber compound, and additives. Its volume expansion ratio is not less than 400%. If a small amount of moisture breaks through the first line of defense and contacts the waterstop due to construction defects or long-term deformation, the water-swellable rubber layers 2 on both sides will immediately absorb water and expand, with an expansion ratio of 4-6 times. This expanded body generates a huge reverse extrusion force, which can automatically and accurately fill any interface gaps that may exist between the waterstop and the concrete, as well as the surrounding micropores, forming a water-proof second chemical seal and achieving a self-healing function of "stopping water with water".

[0018] The surface of the nonwoven reinforcement layer 3 is made of polyester or polypropylene nonwoven fabric with a rough structure, and the unit area mass is 50-150 g / m². The surface nonwoven reinforcement layer 3 has multiple functions: a) it increases the overall tensile strength and puncture resistance of the waterstop, preventing it from being punctured by steel bars during construction; b) its porous structure provides expansion space and water seepage channels for the water-swellable layer, making expansion faster and more complete; c) the rough surface of the nonwoven fabric can generate extremely strong mechanical interlocking and adhesion with concrete, greatly improving the interfacial bonding performance between the waterstop and concrete, and effectively preventing the "water seepage" phenomenon. Example

[0019] The manufacturing method of this novel composite waterstop includes the following steps: 1. Prepare the compound of the corrugated rubber base layer 1; 2. Prepare the compound of water-swellable rubber layer 2; 3. Apply two layers of water-swellable rubber compound to the upper and lower sides of the corrugated rubber base compound, and then composite non-woven fabric reinforcement material 3 on the outermost layer. 4. Place it in a mold and perform co-vulcanization treatment by heating and pressurizing to firmly bond each layer together and form a strong chemical bond between the layers to produce a composite waterstop.

[0020] The above embodiments are for illustrative purposes only and are not intended to limit the scope of this utility model. Those skilled in the art can make various modifications and variations without departing from the spirit and scope of this utility model. Therefore, all equivalent technical solutions should also fall within the scope of this utility model and should be defined by the claims.

Claims

1. A novel composite waterstop, comprising a substrate, characterized in that: The cross-section of the substrate is a multi-layer composite structure with symmetrical upper and lower layers. The middle layer of the multi-layer composite structure is a corrugated rubber base layer (1). The upper and lower layers of the corrugated rubber base layer are each covered with a water-swellable rubber layer (2). The surface of the water-swellable rubber layer (2) is provided with a non-woven fabric reinforcement layer (3).

2. The novel composite waterstop as described in claim 1, characterized in that, The thickness of the water-swellable rubber layer (2) is 2-4 mm.

3. The novel composite waterstop as described in claim 1, characterized in that, The nonwoven reinforcement layer (3) is a polyester nonwoven fabric or a polypropylene nonwoven fabric.

4. The novel composite waterstop as described in claim 3, characterized in that, The unit area mass of the polyester nonwoven fabric or polypropylene nonwoven fabric is 50-150 g / m².

5. The novel composite waterstop as described in claim 1, characterized in that, The wave-shaped rubber base layer (1) has a wave crest and trough spacing of 5-10 mm and a wave height of 2-5 mm to enhance the elastic deformation capability of the waterstop.

6. The novel composite waterstop as described in claim 1, characterized in that, The water-swellable rubber layer (2) is formed by blending and vulcanizing water-absorbing resin, rubber compound and additives, with an expansion ratio of not less than 400%.

7. The novel composite waterstop as described in claim 1, characterized in that, The surface of the nonwoven reinforcement layer (3) has a rough structure, which is used to form a mechanical interlock with the concrete interface.

8. The novel composite waterstop as described in claim 1, characterized in that, The nonwoven reinforcement layer (3) has an open-pore structure to provide a permeable channel for the water-swellable rubber layer.

9. The novel composite waterstop as described in claim 1, characterized in that, The corrugated rubber base layer (1), the water-swellable rubber layer (2), and the non-woven fabric reinforcement layer (3) are combined into a whole through a co-vulcanization process.

10. The novel composite waterstop as described in claim 1, characterized in that, The corrugated rubber base layer (1) adopts a continuous undulating structure to adapt to the deformation of the concrete structure and maintain the sealing performance.

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