A waterproof structure for the joint between old and new building concrete slabs

Abstract

This utility model relates to a waterproof structural device for the connection between old and new concrete foundation slabs in buildings, belonging to the field of building waterproofing engineering technology. It includes a main waterproofing body, which is inverted Z-shaped and positioned at the connection between the old and new concrete foundation slabs. A honeycomb buffer layer is filled between the main waterproofing body and both the old and new concrete foundation slabs. Several interlocking grooves are formed on the contact surfaces of the old and new concrete foundation slabs with the honeycomb buffer layer. The filling material within the main waterproofing body and the honeycomb skeleton can absorb water and expand significantly to form a gel barrier layer, creating multiple layers of defense. This allows it to adapt to complex working conditions, significantly extending the waterproofing lifespan. Furthermore, the main waterproofing body combines elasticity and strength, allowing it to deform to some extent with the settlement of the old and new foundation slabs. Combined with the good toughness of the honeycomb buffer layer, it is less prone to localized tearing during deformation, reducing stress concentration and sealing failure, and ensuring the overall structural integrity.

Description

Technical Field

[0001] This utility model relates to the field of building waterproofing engineering technology, specifically to a waterproof structure at the joint between the concrete base slabs of new and old buildings. Background Technology

[0002] The joint between the old and new concrete slabs is usually called a construction joint or post-pouring strip. It is a structural node set up to solve problems such as pouring time, settlement difference, and temperature deformation between the old and new concrete structures. Its function is to ensure that the old and new slabs can be effectively connected, while reducing cracks caused by uneven settlement and shrinkage deformation, and ensuring the integrity and safety of the structure.

[0003] The old and new concrete were poured at different times. After long-term weathering and carbonization, the old foundation slab surface is difficult to bond with the newly poured concrete to achieve the same density as the whole pour. This can easily form tiny gaps, which become channels for water to seep in. Water seepage can lead to steel corrosion. The expansion of the corrosion products can further damage the concrete protective layer, weaken the structural bearing capacity, and long-term water seepage can also soften the foundation soil, causing uneven settlement and affecting the overall stability of the building.

[0004] Although existing technologies can protect and stop water at the joint between the concrete slabs of new and old buildings, when faced with deformation caused by settlement, a large amount of stress concentration can easily cause the sealing layer to tear locally during the deformation process, reducing the overall structural integrity and shortening the service life of the structure. Furthermore, the cracking of the sealing layer can lead to water leakage problems, and under long-term erosion, it will reduce the waterproof effect of the entire structure, resulting in a shorter effective period of the waterproof seal. Utility Model Content

[0005] This utility model addresses the technical problems existing in the prior art by providing a waterproof structure for the connection between the concrete base slabs of new and old buildings.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: It includes a main seepage barrier, which is an inverted Z-shape. The main seepage barrier is located at the junction of the old concrete base slab and the new concrete base slab. A honeycomb buffer layer is filled between the main seepage barrier and the new concrete base slab and the old concrete base slab. Several interlocking grooves are opened on the contact surfaces of the old concrete base slab and the new concrete base slab with the honeycomb buffer layer. The honeycomb buffer layer includes a honeycomb skeleton, the inner side of which is a honeycomb-shaped cavity. Several linear arrays of interlocking protrusions are fixedly connected to the outer surface of the honeycomb skeleton away from the main impermeable body. Each pair of adjacent interlocking protrusions is fixedly connected to an adhesive strip at the end closest to the main impermeable body. The adhesive strip is embedded in the outer surface of the main impermeable body.

[0007] The beneficial effects of this utility model are as follows: the filling material inside the main waterproofing body can expand and fill gaps when exposed to water, and the filling material inside the honeycomb skeleton of the honeycomb buffer layer can absorb water and expand significantly to form a gel barrier layer. At the same time, the main waterproofing body and the honeycomb buffer layer form a multi-layer defense line through connection with the concrete base slab, which solves the leakage problem caused by the failure and rupture of the sealing layer in traditional waterproofing structures. Through the synergistic effect of different materials and structures, it can adapt to complex working conditions such as long-term dry and wet cycles and minor deformations, and the waterproofing life is significantly extended. Furthermore, the main waterproofing body has both elasticity and strength, and can deform to a certain extent with the settlement of the old and new base slabs. Combined with the good toughness of the honeycomb buffer layer, the honeycomb structure can disperse stress and absorb relative displacement within a certain range, which enhances the structural stability and makes it less likely to tear locally during deformation. Through the elastic deformation of the flexible material and the buffering effect of the honeycomb structure, the sealing failure caused by stress concentration is reduced, ensuring that the joints remain tightly fitted during long-term use and guaranteeing the integrity of the structure.

[0008] Furthermore, the main seepage barrier includes a Z-shaped seepage barrier body. The outer surface of the seepage barrier body is fixedly connected to the end of the honeycomb skeleton away from the interlocking protrusion. A hollow cavity is opened on the inner side of the seepage barrier body. Several fixed ribs are fixedly connected to the inner wall of the hollow cavity. The fixed ribs are isosceles triangles. The seepage barrier body and the honeycomb skeleton form a cooperative force-bearing structure. The isosceles triangle fixed ribs cooperate with the internal material to stably disperse the deformation stress on the seepage barrier body.

[0009] Furthermore, the engagement protrusion engages with the engagement groove, which can better disperse stress through engagement.

[0010] Furthermore, the honeycomb-shaped cavities inside the honeycomb skeleton are filled with sodium-based bentonite. The sodium-based bentonite expands rapidly when it comes into contact with water, filling the gaps in the honeycomb cavities and compressing the honeycomb skeleton, so that the honeycomb buffer layer fits more tightly with the main impermeable body and the concrete base plate, and blocks the water seepage path through the expansion effect.

[0011] Furthermore, the honeycomb skeleton is made of modified polypropylene. The modified polypropylene honeycomb skeleton maintains its shape stability under the expansion pressure of bentonite, providing support for the expanded bentonite.

[0012] Furthermore, both the fixing ribs and the main seepage barrier are made of neoprene rubber and carbon fiber composite material, which gives the main seepage barrier both elasticity and strength, allowing it to adapt to deformation as the bottom plate settles without easily breaking.

[0013] Furthermore, the hollow cavity is filled with hydrophilic polyurethane foam. The hydrophilic polyurethane foam expands when it comes into contact with water, fills the gaps in the hollow cavity, and applies pressure to the inner wall of the seepage-proof body, so as to make it fit more tightly with the contact surface of the honeycomb buffer layer and the concrete base plate, thereby enhancing the sealing performance. Attached Figure Description

[0014] Figure 1 This is a structural diagram of the present invention; Figure 2 This is an assembly drawing of the present utility model; Figure 3 This is a structural diagram of the honeycomb buffer layer of this utility model; Figure 4 This is a cross-sectional view of the inner side of the main seepage barrier of this utility model; Figure 5 This is a structural diagram of the concrete base plate of this utility model.

[0015] The attached diagram lists the components represented by each number as follows: 1. Old concrete base slab; 2. Main seepage barrier; 21. Seepage barrier body; 22. Hollow cavity; 23. Fixing ribs; 3. Honeycomb buffer layer; 31. Interlocking protrusions; 32. Honeycomb skeleton; 33. Adhesive strips; 4. New concrete base slab; 5. Interlocking grooves. Detailed Implementation

[0016] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0017] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0018] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this technology based on the specific circumstances.

[0019] In the description of this application, spatial relation terms such as “below,” “under,” “below,” “below,” “above,” “over,” etc., are used herein to describe the relationship between an element or feature shown in the figures and other elements or features. It should be understood that, in addition to the orientation shown in the figures, spatial relation terms also include different orientations of the device in use and operation. For example, if the device in the figures is flipped, an element or feature described as “below,” “under,” or “below” will be oriented “over” the other element or feature. Therefore, the exemplary terms “below” and “under” can include both upper and lower orientations. Furthermore, the device may also include other orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptive terms used herein are interpreted accordingly.

[0020] In the description of this application, the term "for example" is used to mean "used as an example, illustration, or description." Any embodiment described as "for example" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to implement and use the present invention. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that the present invention can be implemented without using these specific details. In other instances, well-known structures and processes will not be described in detail to avoid obscuring the description of the present invention with unnecessary detail. Therefore, the present invention is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.

[0021] Example 1 Figure 1 This utility model provides a structural diagram of a waterproof structure for the connection between old and new building concrete slabs. (See diagram for example.) Figure 1 The device includes a main seepage barrier 2, which is an inverted Z-shape. The main seepage barrier 2 is located at the junction of the old concrete base slab 1 and the new concrete base slab 4. A honeycomb buffer layer 3 is filled between the main seepage barrier 2 and the new concrete base slab 4 and the old concrete base slab 1. Several interlocking grooves 5 are opened on the contact surfaces of the old concrete base slab 1 and the new concrete base slab 4 with the honeycomb buffer layer 3.

[0022] During assembly, the inverted Z-shaped main impermeable body 2 adapts to the space at the joint, and the honeycomb buffer layer 3 fills the gap between the main impermeable body 2 and the bottom plate, initially forming a physical barrier. The interlocking groove 5 provides a structural foundation for subsequent connections, and the whole structure forms the first protective frame at the joint.

[0023] Figure 2 This is an assembly drawing of the present invention. Figure 3 This is a structural diagram of the honeycomb buffer layer of this utility model. Figure 2 , Figure 3 As shown, the honeycomb buffer layer 3 includes a honeycomb skeleton 32. The inner side of the honeycomb skeleton 32 is a honeycomb-shaped cavity. Several linear array of interlocking protrusions 31 are fixedly connected to the outer surface of the honeycomb skeleton 32 away from the main impermeable body 2. Each pair of adjacent interlocking protrusions 31 are fixedly connected to an adhesive strip 33 at the end near the main impermeable body 2. The adhesive strip 33 is embedded in the outer surface of the main impermeable body 2. The interlocking protrusions 31 are engaged with the interlocking grooves 5.

[0024] The interlocking ridge 31 and the interlocking groove 5 are engaged to firmly connect the honeycomb buffer layer 3 to the base plate. The bonding strip 33 tightly combines the honeycomb buffer layer 3 with the main impermeable body 2 to form a whole. The honeycomb structure of the honeycomb skeleton 32 disperses the stress generated by structural deformation through the geometric stability of the hexagon, avoiding excessive local pressure that could lead to sealing failure.

[0025] The honeycomb-shaped cavities inside the honeycomb skeleton 32 are filled with sodium-based bentonite. The honeycomb skeleton 32 is made of modified polypropylene. When water seepage occurs at the joint, the sodium-based bentonite expands rapidly upon contact with water, filling the gaps in the honeycomb cavities and compressing the honeycomb skeleton. This makes the contact surface between the honeycomb buffer layer and the main seepage barrier and the concrete base slab more tightly bonded. Through the expansion effect, it blocks the water seepage path. At the same time, the honeycomb skeleton made of modified polypropylene maintains its shape stability under the expansion pressure of bentonite, providing support for the expanded bentonite and ensuring that it continues to play a sealing role, thereby enhancing the reliability of the waterproof structure.

[0026] Example 2 Based on Embodiment 1, the present invention can be further improved as follows: Figure 4 This is a cross-sectional view of the inner side of the main seepage barrier of this utility model. (See image below.) Figure 4 As shown, the main impermeable body 2 includes a Z-shaped impermeable body 21. The outer surface of the impermeable body 21 is fixedly connected to the end of the honeycomb skeleton 32 away from the interlocking protrusion 31. A hollow cavity 22 is opened on the inner side of the impermeable body 21. Several fixing ribs 23 are fixedly connected to the inner wall of the hollow cavity 22. The fixing ribs 23 are isosceles triangles.

[0027] The Z-shaped seepage-proof body 21 and the honeycomb skeleton 32 form a cooperative stress-bearing structure. The isosceles triangular fixing ribs 23, together with the internal material, stabilize and disperse the deformation stress on the seepage-proof body 21, preventing it from tearing locally during settlement or deformation, and ensuring the overall integrity of the main seepage-proof body 2.

[0028] The fixing ribs 23 and the seepage-proof body 21 are both made of neoprene rubber and carbon fiber composite material, and the hollow cavity 22 is filled with hydrophilic polyurethane foam.

[0029] The neoprene rubber and carbon fiber composite material gives the main seepage barrier 2 both elasticity and strength, allowing it to adapt to deformation with the settlement of the base plate without easily breaking. The hydrophilic polyurethane foam expands when it comes into contact with water, filling the gaps in the hollow cavity 22 and applying pressure to the inner wall of the seepage barrier body 21, making it fit more tightly with the honeycomb buffer layer 3 and the concrete base plate, thus enhancing the sealing performance.

[0030] While embodiments or examples of this disclosure have been described with reference to the accompanying drawings, it should be understood that the above embodiments are merely exemplary embodiments or examples, and the scope of this utility model is not limited by these embodiments or examples, but only by the granted claims and their equivalents. Various elements in the embodiments or examples may be omitted or replaced by their equivalents. Furthermore, the steps may be performed in a different order than that described in this disclosure. Further, various elements in the embodiments or examples may be combined in various ways. Importantly, as the technology evolves, many elements described herein can be replaced by equivalents that appear after this disclosure.

Claims

1. A waterproof structure for the interface between new and old concrete floors, characterized by, include: The main seepage barrier (2) is inverted Z-shaped. The main seepage barrier (2) is located at the junction of the old concrete base slab (1) and the new concrete base slab (4). A honeycomb buffer layer (3) is filled between the main seepage barrier (2) and the new concrete base slab (4) and the old concrete base slab (1). Several interlocking grooves (5) are opened on the contact surfaces of the old concrete base slab (1) and the new concrete base slab (4) and the honeycomb buffer layer (3). The honeycomb buffer layer (3) includes a honeycomb skeleton (32). The inner side of the honeycomb skeleton (32) is a honeycomb-shaped cavity. A number of linear array interlocking protrusions (31) are fixedly connected to the outer surface of the honeycomb skeleton (32) away from the main impermeable body (2). Each pair of adjacent interlocking protrusions (31) are fixedly connected to an adhesive strip (33) at the end near the main impermeable body (2). The adhesive strip (33) is embedded in the outer surface of the main impermeable body (2).

2. The waterproof structure of the interface between the new and old concrete bottom plates according to claim 1, characterized in that, The main impermeable body (2) includes a Z-shaped impermeable body (21). The outer surface of the impermeable body (21) is fixedly connected to the end of the honeycomb skeleton (32) away from the interlocking protrusion (31). A hollow cavity (22) is opened on the inner side of the impermeable body (21). Several fixed ribs (23) are fixedly connected to the inner wall of the hollow cavity (22). The fixed ribs (23) are isosceles triangles.

3. The waterproof structure of the interface between the new and old concrete bottom plates according to claim 1, characterized in that, The occlusal protrusion (31) engages with the occlusal groove (5).

4. The waterproof structure of the interface between the new and old concrete bottom plates according to claim 2, characterized in that, The honeycomb-shaped cavity inside the honeycomb skeleton (32) is filled with sodium bentonite.

5. A waterproof structure for the connection between old and new building concrete slabs according to claim 3, characterized in that, The honeycomb skeleton (32) is made of modified polypropylene.

6. The waterproof structure of the interface between the new and old concrete slabs according to claim 2, characterized in that, The fixed ribs (23) and the seepage-proof body (21) are both made of chloroprene rubber and carbon fiber composite material.

7. The waterproof structure of the interface between the new and old concrete slabs according to claim 6, characterized in that, The hollow cavity (22) is filled with hydrophilic polyurethane foam.

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