Waterstop structure for joint between new and old buildings

Abstract

The utility model relates to a waterstop structure at the joint of new and old buildings, which comprises an original building outer wall and a new building foundation, and further comprises a waterstop steel plate fixed to the original building outer wall, a waterproof coating arranged between the waterstop steel plate and the original building outer wall, a bonded rebar structure arranged in the new building foundation, and a cushion layer arranged below the new building foundation. The galvanized waterstop steel plate and the non-solidified rubber asphalt coating form a composite waterproof system, thereby forming a multi-stage waterproof barrier and effectively preventing groundwater from seeping into the building interior through the joint; the M8 expansion bolt fixes the waterstop steel plate and the bonded rebar structure to form a bidirectional anchoring system, thereby dispersing the settlement stress and being adaptable to dynamic settlement deformation.

Description

Technical Field

[0001] This utility model relates to the field of building waterproofing technology, and more specifically, to a water-stopping structure for the joint between new and old buildings. Background Technology

[0002] In urban construction, it is common to construct new buildings next to existing ones. Joints exist between the old and new buildings, and waterproofing is typically required at these joints to prevent groundwater and rainwater from seeping into the building. When constructing new buildings next to existing structures, waterproofing at the joints is crucial for ensuring the overall safety and durability of the building. However, traditional waterproofing solutions have several drawbacks. For example, rubber waterstops are susceptible to aging and cracking due to UV radiation and chemical corrosion, resulting in insufficient long-term waterproofing performance. Similarly, using a single steel waterstop plate with a limited anchoring method (such as expansion bolts) can lead to anchoring failure due to foundation settlement, and the interface between the steel plate and concrete can easily create seepage channels. These traditional waterproofing solutions suffer from weak waterproofing layer design, lack multi-level waterproofing barriers, and are unable to address the leakage risks caused by dynamic deformation of the joints.

[0003] Patent CN216276223U discloses a steel plate waterstop and a waterproof structure for construction joints. The waterstop has two protrusions at its top and bottom, with an embedding groove between them for embedding an expansion waterproof strip. This design prevents air accumulation during concrete pouring, reducing the risk of leakage. However, its anchoring system relies solely on welding, failing to address the stress concentration problem caused by differential settlement between new and old buildings. Therefore, an integrated solution combining anchoring strength, dynamic adaptability, and multi-level waterproofing is urgently needed. Utility Model Content

[0004] To overcome the shortcomings mentioned above, this utility model aims to provide a water-stopping structure for the joints of new and old buildings. It can solve the leakage problems caused by weak waterproof layer design, lack of multi-level waterproof barriers, and inability to cope with dynamic deformation at the joints in traditional water-stopping solutions through a two-way anchoring system and a composite waterproofing system.

[0005] A water-stopping structure for the joint between old and new buildings includes the original building's exterior wall and the new building's foundation, and further includes: a water-stopping steel plate fixed to the original building's exterior wall; a waterproof coating disposed between the water-stopping steel plate and the original building's exterior wall; a rebar anchoring structure disposed within the new building's foundation; and a pad layer disposed below the new building's foundation.

[0006] Furthermore, the water-stop steel plate includes an anchoring flange, a steel plate body, and a bent flange. The anchoring flange and the bent flange are respectively located at both ends of the steel plate body. The anchoring flange is close to the original building exterior wall, and the bent flange is far away from the original building exterior wall.

[0007] Furthermore, the waterproof coating is a non-curing rubber asphalt waterproof coating, one side of the waterproof coating is attached to the original building exterior wall, and the other side of the waterproof coating is in contact with the anchoring flange.

[0008] Furthermore, the anchoring flange is provided with a plurality of first anchoring holes, and the spacing between adjacent first anchoring holes is the same.

[0009] Furthermore, a plurality of second anchoring holes are provided on the exterior wall of the original building, the spacing between adjacent second anchoring holes is the same, and the first anchoring hole and its corresponding second anchoring hole are on the same straight line.

[0010] Furthermore, an expansion bolt is installed on the first anchoring hole, and the expansion bolt penetrates the waterproof coating and enters the second anchoring hole.

[0011] Furthermore, the bent flange is inclined upward, and the angle formed between the bent flange and the main body of the steel plate is an obtuse angle.

[0012] Furthermore, the rebar anchoring structure includes rebar anchoring holes opened in the exterior wall of the original building and rebars provided in the foundation of the new building. The rebars are anchored to the rebar anchoring holes and are provided on the upper and lower sides of the foundation of the new building and below the waterstop steel plate.

[0013] Furthermore, a waterproof membrane is provided on the cushion layer, and the end of the waterproof membrane is turned down and attached to the original building exterior wall.

[0014] Furthermore, a protective layer is provided on the waterproof membrane, and the new building foundation is located on the protective layer.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] ① A composite waterproofing system consisting of galvanized waterstop steel plate and non-curing rubber asphalt coating forms a multi-level waterproof barrier, effectively preventing groundwater from seeping into the building through the joints.

[0017] ②The M8 expansion bolts fix the water-stop steel plate and the rebar structure to form a two-way anchoring system, which disperses settlement stress and can adapt to dynamic settlement deformation. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0019] Figure 1 This is a schematic diagram of the overall structure of a water-stopping structure at the joint between old and new buildings.

[0020] Figure 2 yes Figure 1 Enlarged view of point A in the middle.

[0021] In the diagram: 1. Existing building exterior wall; 11. Second anchor hole; 2. New building foundation; 3. Water-stop steel plate; 31. Anchor flange; 311. First anchor hole; 32. Steel plate body; 33. Bending flange; 4. Waterproof coating; 5. Rebar structure; 51. Rebar hole; 52. Rebar; 6. Subbase; 61. Waterproof membrane; 62. Protective layer; 7. Expansion bolt. Detailed Implementation

[0022] 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.

[0023] like Figure 1 , Figure 2 As shown, a water-stopping structure at the joint between old and new buildings includes the original building exterior wall 1 and the new building foundation 2, and also includes: a water-stopping steel plate 3 fixed to the original building exterior wall 1; a waterproof coating 4 between the water-stopping steel plate 3 and the original building exterior wall 1; a rebar structure 5 installed in the new building foundation 2; and a pad layer 6 installed below the new building foundation 2.

[0024] The water-stop steel plate 3 includes an anchoring flange 31, a steel plate body 32, and a bent flange 33. The anchoring flange 31 and the bent flange 33 are respectively located at both ends of the steel plate body 32. The anchoring flange 31 is close to the original building exterior wall 1, and the bent flange 33 is away from the original building exterior wall 1. The anchoring flange 31, the steel plate body 32, and the bent flange 33 are integrally formed. All three are made of 3mm thick galvanized steel plate. The total width of the anchoring flange 31, the steel plate body 32, and the bent flange 33 is 250mm, and the length is prefabricated according to the actual needs of the joint. The galvanized steel plate is corrosion-resistant, has high strength, and a long service life.

[0025] The waterproof coating 4 is a non-curing rubber asphalt waterproof coating. One side of the waterproof coating 4 is attached to the original building exterior wall 1, and the other side of the waterproof coating 4 is in contact with the anchor flange 31. The coating thickness of the waterproof coating 4 is 3mm, and the coating width extends outward by 10mm on each side along the anchor flange 31. The non-curing rubber asphalt waterproof coating maintains a viscoelastic state after construction, without curing or cracking, and has an elongation rate of greater than or equal to 800%, which is used to adapt to the dynamic deformation at the joint. The galvanized waterstop steel plate 3 and the non-curing rubber asphalt coating form a composite waterproof system, creating a multi-level waterproof barrier, effectively preventing groundwater from seeping into the building interior through the joints.

[0026] The anchoring flange 31 is provided with a plurality of first anchoring holes 311, the spacing between adjacent first anchoring holes 311 is the same, and the distance between adjacent first anchoring holes 311 is 200mm.

[0027] Several second anchor holes 11 are provided on the exterior wall 1 of the original building. The spacing between adjacent second anchor holes 11 is the same, which is also 200mm. The first anchor hole 311 and its corresponding second anchor hole 11 are on the same straight line.

[0028] An expansion bolt 7 is installed in the first anchoring hole 311, penetrating the waterproof coating 4 and entering the second anchoring hole 11. The expansion bolt 7 is an M8 type with a nominal diameter of 8mm. The length is selected according to the thickness of the substrate, and the tensile strength is greater than or equal to 400MPa. When drilling into the original building exterior wall 1, a 10mm drill bit is selected, and the drilling depth is 10mm longer than the bolt. Care should be taken to avoid pipelines during drilling. After drilling to the specified depth, the drill bit is slowly withdrawn to prevent chipping at the hole opening. After drilling is completed, the hole is cleaned with an air blower or brush to thoroughly remove debris. After cleaning the holes, apply the heated, fluid-like waterproof coating 4 evenly to the surface of the original building exterior wall 1 where the waterstop steel plate 3 is to be installed using a scraper. After the waterproof coating 4 is applied, install the waterstop steel plate 3, aligning the first anchoring hole 311 on the anchoring flange 31 with the drilled second anchoring hole 11. Insert the expansion sleeve of the expansion bolt 7, manually screw the bolt into the bottom of the expansion sleeve, and tighten the nut with a wrench until the expansion sleeve is fully opened. Fix the waterstop steel plate 3 at the joint between the original building exterior wall 1 and the new building foundation 2.

[0029] The bent flange 33 is inclined upward to prevent air bubbles from forming at the waterstop steel plate 3 during concrete pouring and vibration, thus preventing problems such as hollowing. The angle formed between the bent flange 33 and the main body of the steel plate 32 is an obtuse angle. The projected width of the bent flange 33 along the direction of the main body of the steel plate 32 is 50mm, which is used to increase the waterstop path and improve the waterstop effect.

[0030] The rebar anchoring structure 5 includes anchoring holes 51 drilled in the original building's exterior wall 1 and rebars 52 placed in the new building's foundation 2. The rebars 52 are anchored to the anchoring holes 51 and are located on the upper and lower sides of the new building's foundation 2 and below the waterstop steel plate 3. The anchoring holes 51 are drilled using an electric drill. The anchoring method and depth are in accordance with anchoring specifications. HRB400 grade rebars 52 with a diameter of 20mm are used on the upper and lower sides of the new building's foundation 2, spaced 200mm apart along the joint length, forming a two-way anchoring system with the M8 expansion bolts 7. HRB400 grade rebars 52 with a diameter of 16mm are used below the waterstop steel plate 3, spaced 200mm apart along the joint length.

[0031] After the rebar structure 5 and the waterstop steel plate 3 are completed, concrete is poured to enclose both the rebar structure 5 and the waterstop steel plate 3 in the foundation concrete. M8 expansion bolts 7 are used to fix the waterstop steel plate 3 and the rebar structure 5 to form a two-way anchoring system, which disperses settlement stress and can adapt to dynamic settlement deformation.

[0032] The foundation layer 6 is constructed first when the new building foundation 2 is made. A waterproof membrane 61 is installed on the foundation layer 6. The end of the waterproof membrane 61 is turned down 300mm and attached to the original building exterior wall 1. The waterproof membrane 61 prevents groundwater from rising up.

[0033] A protective layer 62, made of concrete, is provided on the waterproof membrane 61 to protect the waterproof membrane 61 from damage during subsequent construction. The new building foundation 2 is located on the protective layer 62.

[0034] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A water-stopping structure for the joint between old and new buildings, comprising the original building's exterior wall (1) and the new building's foundation (2), characterized in that, Also includes: Water-stop steel plate (3) fixed to the original building exterior wall (1); A waterproof coating (4) is provided between the water-stop steel plate (3) and the original building exterior wall (1); The rebar structure (5) is installed within the foundation (2) of the new building; and A cushion layer (6) is provided below the foundation (2) of the new building.

2. The water-stopping structure at the joint between old and new buildings according to claim 1, characterized in that: The water-stop steel plate (3) includes an anchor flange (31), a steel plate body (32), and a bent flange (33). The anchor flange (31) and the bent flange (33) are respectively located at both ends of the steel plate body (32). The anchor flange (31) is close to the original building exterior wall (1), and the bent flange (33) is far away from the original building exterior wall (1).

3. The water-stopping structure at the joint between old and new buildings according to claim 2, characterized in that: The waterproof coating (4) is a non-curing rubber asphalt waterproof coating. One side of the waterproof coating (4) is attached to the original building exterior wall (1), and the other side of the waterproof coating (4) is in contact with the anchor flange (31).

4. The water-stopping structure at the joint between old and new buildings according to claim 3, characterized in that: The anchoring flange (31) is provided with a plurality of first anchoring holes (311), and the spacing between adjacent first anchoring holes (311) is the same.

5. A water-stopping structure for the joint between old and new buildings according to claim 4, characterized in that: The original building exterior wall (1) has a number of second anchor holes (11) with the same spacing between adjacent second anchor holes (11), and the first anchor hole (311) and its corresponding second anchor hole (11) are on the same straight line.

6. A water-stopping structure for the joint between old and new buildings according to claim 5, characterized in that: An expansion bolt (7) is installed on the first anchoring hole (311), and the expansion bolt (7) penetrates the waterproof coating (4) and enters the second anchoring hole (11).

7. A water-stopping structure for the joint between old and new buildings according to claim 6, characterized in that: The bent flange (33) is inclined upward, and the angle formed between the bent flange (33) and the main body of the steel plate (32) is an obtuse angle.

8. A water-stopping structure for the joint between old and new buildings according to claim 7, characterized in that: The rebar structure (5) includes rebar holes (51) opened in the original building exterior wall (1) and rebars (52) provided in the new building foundation (2). The rebars (52) are anchored to the rebar holes (51) and are provided on the upper and lower sides of the new building foundation (2) and below the waterstop steel plate (3).

9. A water-stopping structure for the joint between old and new buildings according to claim 8, characterized in that: The cushion layer (6) is provided with a waterproof membrane (61), and the end of the waterproof membrane (61) is turned down and attached to the original building exterior wall (1).

10. A water-stopping structure for the joint between old and new buildings according to claim 9, characterized in that: The waterproof membrane (61) is provided with a protective layer (62), and the new building foundation (2) is provided on the protective layer (62).

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