Quick-connect seepage prevention structure for waterstops used in underpasses at road-bridge junctions

Abstract

This utility model discloses a quick-connect seepage prevention structure for waterstops in underpass structures at road-bridge junctions, including adjacent overlapping waterstop bodies, pressing components, and a cold-bonded seepage prevention layer. The advantages of this utility model are: (1) Improved connection strength: The composite seepage prevention structure with cold bonding and pressing ensures stability under water pressure and structural deformation force, and the cold-bonded seepage prevention layer improves the seepage prevention effect of the joint; when subjected to 1.2MPa water pressure and ±20% structural deformation, no structural damage or leakage will occur; (2) Excellent sealing performance: It fills the transverse and longitudinal gaps tightly, and the formed cold-bonded seepage prevention layer fills the gaps that will inevitably form between the lower waterstop and the upper waterstop, as well as between the waterstop and the concrete structure, reducing the risk of leakage and ensuring waterproofing and structural safety; (3) Convenient and efficient construction: The construction method is clear and easy to operate, and the material cools down quickly, ensuring the safety of the underpass structure at the road-bridge junction.

Description

Technical Field

[0001] This utility model relates to the field of water-stop structure technology, specifically to a quick-connect seepage prevention structure for water-stop strips used in underpass structures at road-bridge junctions. Background Technology

[0002] In modern railway construction, the road-bridge junction is a crucial component of the line, and its stability directly affects the safety of train operation. However, due to factors such as complex geological conditions, the influence of groundwater, and structural damage, leakage problems frequently occur in the underpass structures of railway road-bridge junctions, becoming a prominent issue restricting the sustainable development of operating lines.

[0003] In structures such as culverts, basements, underground passages, and tunnels at railway bridge junctions, externally applied waterstops are crucial waterproofing materials at expansion joints. The quality of the waterstop joints is paramount, directly affecting the waterstop's effectiveness and the structure's waterproofing performance. Improper joint treatment can easily lead to leakage and other problems, impacting the overall quality and durability of the project.

[0004] Traditional hot vulcanization joints can cross-link rubber molecules at the joint to form a stable structure, ensuring connection strength and sealing performance, and can effectively stop water under normal conditions. However, it has high requirements for equipment and technology, requiring specialized vulcanization equipment and skilled operators, which increases construction costs. Furthermore, the vulcanization process is subject to strict control of temperature, pressure, and time; even slight deviations can affect the joint quality, reduce the water-stopping effect, and shorten the service life.

[0005] While cold bonding is a relatively simple method that requires no complex equipment, involving adhesive bonding between the waterstop ends, its joint strength is limited. It cannot withstand significant external forces, and the joints are prone to damage under large structural deformations, failing to meet the requirements of complex engineering environments.

[0006] In summary, existing waterstop joint connection and seepage prevention methods have limitations and cannot simultaneously meet the requirements of modern construction projects for high connection strength, good sealing performance, strong adaptability to deformation, simple construction and controllable cost of waterstop joint seepage prevention protection structure. Therefore, it is urgent to develop new waterstop joint seepage prevention structures and construction methods. Summary of the Invention

[0007] The purpose of this invention is to address the shortcomings of the prior art by providing a quick-connect seepage prevention structure for waterstops in underpass structures at road-bridge junctions. This quick-connect seepage prevention structure involves overlapping adjacent waterstop bodies, then pressing and fixing the overlapping and non-overlapping areas separately using a pressing assembly, and finally filling the gap between the waterstop body and the concrete structure surface to form a cold-bonded seepage prevention layer. This improves the sealing performance of the quick-connect seepage prevention structure and reduces the probability of leakage.

[0008] The objective of this utility model is achieved through the following technical solution:

[0009] A quick-connect seepage prevention structure for waterstops in underpass structures at road-bridge junctions, characterized in that the quick-connect seepage prevention structure includes adjacent overlapping waterstop bodies, a pressing assembly, and a cold-bonded seepage prevention layer.

[0010] The waterstop body is laid on the surface of the concrete structure. The splicing end of the waterstop body on one side extends from the surface of the concrete structure to the top of the splicing end of the waterstop body on the other side to form a waterstop overlap area. The waterstop body on one side is the upper waterstop, and the waterstop body on the other side is the lower waterstop.

[0011] The pressing assembly includes a precast joint steel plate for the overlapping area and a precast steel plate for the non-overlapping area. The precast joint steel plate for the overlapping area is disposed above the overlapping area of ​​the waterstop and is pressed and fixed to the concrete structure surface by a plurality of first expansion bolts. The precast steel plates for the non-overlapping area are respectively disposed on the waterstop body on both sides of the overlapping area of ​​the waterstop and are pressed and fixed to the concrete structure by a plurality of second expansion bolts.

[0012] The cold-bonded seepage-proof layer is an elastic waterproof colloid filled in the gaps, which are formed by the upper waterstop, the splicing ends of the lower waterstop, and the surface of the concrete structure.

[0013] The upper and lower waterstops are bonded together in the overlapping area of ​​the waterstop.

[0014] The splicing ends of the lower waterstop are sloping at 30°-45°.

[0015] The elastic waterproof adhesive is one of polyurethane adhesive, silicone adhesive, or polyurea adhesive.

[0016] The dimensions of the prefabricated joint steel plate in the overlapping area are the same as those of the overlapping area of ​​the waterstop. The four corners of the prefabricated joint steel plate in the overlapping area are perforated to allow the first expansion bolt to pass through.

[0017] The advantages of this utility model are:

[0018] (1) Improved connection strength: The composite seepage prevention structure with cold bonding and pressing ensures the stability of the pressing components under water pressure and structural deformation force, and the cold bonding seepage prevention layer improves the seepage prevention effect of the joint; the seepage prevention structure of the waterstop joint of this utility model will not cause structural damage and leakage when subjected to 1.2MPa water pressure and ±20% structural deformation.

[0019] (2) Excellent sealing performance: It fills the horizontal and vertical gaps tightly, and the cold-bonded anti-seepage layer formed fills the gaps that will inevitably be formed between the lower waterstop and the upper waterstop, as well as between the waterstop and the concrete structure, reducing the risk of leakage and ensuring waterproofing and structural safety.

[0020] (3) Convenient and efficient construction: The construction method and steps are clear and easy to operate, which is easy for construction personnel to master. The material cools down quickly, which can save costs while improving work efficiency and ensuring the safety of the underpass structure at the road-bridge junction. Attached Figure Description

[0021] Figure 1 This is a plan view of the waterstop quick-connect seepage prevention structure used in the underpass structure of the road-bridge junction in this utility model;

[0022] Figure 2 This utility model Figure 1 The diagram of AA in the image. Detailed Implementation

[0023] The features and other related features of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments, so as to facilitate the understanding of those skilled in the art:

[0024] like Figure 1-2 The markings in the figure are as follows: 1. Precast joint steel plate in the overlapping area; 2. Precast steel plate in the non-overlapping area; 3. Upper waterstop; 4. Lower waterstop; 5a. First expansion bolt; 5b. Second expansion bolt; 6. Waterstop overlapping area; 7. Gap; 8. Concrete structure.

[0025] Example: Figure 1 , 2 As shown, this embodiment specifically relates to a quick-connect seepage prevention structure for waterstops used in underpass structures at road-bridge junctions. The quick-connect seepage prevention structure for waterstops includes adjacent overlapping waterstop bodies, a pressing assembly, and a cold-bonded seepage prevention layer.

[0026] like Figure 1 , 2As shown, the waterstop body is laid on the surface of the concrete structure 8. Taking two adjacent overlapping waterstop bodies as an example, the waterstop body on one side is the upper waterstop 3, and the waterstop body on the other side is the lower waterstop 4. The splicing end of the upper waterstop 3 extends from the surface of the concrete structure 8 to above the splicing end of the lower waterstop 4 and is glued together to form the waterstop overlap area 6. The waterstop body is made of high-quality rubber material, which has good elasticity, aging resistance and water resistance. Its thickness is generally between 10mm and 20mm, and 15mm is optional. The overlap surface is ground smooth and roughened, with the roughness controlled between Ra3.2μm and Ra6.3μm to enhance the adhesion with the adhesive material. The adhesive material is a rubber-specific adhesive, neoprene rubber adhesive, polyurethane adhesive and other elastic adhesives, which are fully coated on the overlap area, with an adhesive thickness of about 1mm-3mm. It should be noted that the splicing ends of the lower waterstop 4 are processed into bevels with an angle of 30°-45° to reduce the space between the waterstop and the surface of the concrete structure 8.

[0027] like Figure 1 , 2 As shown, the pressing assembly includes a prefabricated joint steel plate 1 for the overlapping area and a prefabricated steel plate 2 for the non-overlapping area. The prefabricated joint steel plate 1 for the overlapping area is positioned above the overlapping area of ​​the waterstop and is pressed and fixed to the surface of the concrete structure 8 by several first expansion bolts 5a. The prefabricated steel plates 2 for the non-overlapping area are respectively positioned on the waterstop body on both sides of the overlapping area 6 of the waterstop and are pressed and fixed to the surface of the concrete structure 8 by several second expansion bolts 5b. It should be noted that the prefabricated joint steel plate 1 for the overlapping area is made of a customized square steel plate with a thickness between 8mm and 12mm, and has holes at the four corners with a diameter of 16mm to 22mm, preferably 18mm. The steel plate is made of Q235 carbon structural steel and is galvanized to form a metal protective layer, which has good strength, toughness, and corrosion resistance. The overlapping area 6 of the waterstop is fixed and pressed together using the first M16 expansion bolt 5a. The sleeve length of the expansion bolt is 100mm-200mm, and the outer diameter of the expansion tube is 20mm-24mm. It is also galvanized to form a metal protective layer. The expansion bolt provides sufficient pressing capacity to press the waterstop body, the pressing assembly, and the cold-bonded anti-seepage layer into a whole structure.

[0028] like Figure 1 , 2As shown, the cold-bonded waterproof layer is an elastic waterproof colloid filled in the voids 7. The voids 7 are formed by the splicing ends of the upper waterstop 3 and the lower waterstop 4, as well as the surface of the concrete structure 8. The elastic waterproof colloid is one of polyurethane, silicone, or polyurea. Its Shore hardness is between A30 and A60, and it has good elastic recovery ability, which can adapt to a certain degree of structural deformation. Its extrusion rate is ≥80ml / min, and its surface drying time is ≤0.5h. The resulting cold-bonded waterproof layer not only ensures the sealing effect but also adapts to structural deformation due to its elasticity, preventing sealing failure caused by structural displacement or deformation within a certain range.

[0029] like Figure 1 , 2 As shown in the figure, the construction method for the rapid connection and seepage prevention structure of the waterstop for the underpass structure at the road-bridge junction in this embodiment includes the following steps:

[0030] S1: Cleaning of the upper waterstop 3 and lower waterstop 4. Precisely measure and cut the two externally applied waterstop sections, ensuring that their joints form an overlap with a length precisely equal to the width of the waterstop. Then, carefully grind the overlap surface using professional grinding tools to make it smooth and uniformly rough. Next, thoroughly clean the surface of oil, dust, and other impurities using cleaning tools and solvents to provide a good adhesion base for subsequent adhesive application. For example, in a basement waterproofing project in this embodiment, the waterstop width is 300mm. Construction workers use an electric cutting tool to cut the waterstop to the appropriate length, grind the overlap surface with sandpaper, and then wipe it clean with acetone.

[0031] S2: During the application of the adhesive material, select a suitable adhesive material from elastic adhesives such as neoprene rubber adhesive and polyurethane adhesive that meet the quality standards. According to the application process specified in the product instructions, use a brush or spray gun to evenly apply the material to the overlapping area of ​​the waterstop, ensuring no omissions and uniform thickness.

[0032] S3: End treatment operation. Using cutting equipment, precisely cut the ends of the lower waterstop 4 at an angle. The angle is controlled between 30° and 45° to effectively reduce gaps between the waterstop and the concrete during subsequent installation. For example, in a tunnel project, cutting the ends of the lower waterstop 4 at a 45° angle resulted in a tighter fit between the waterstop and the concrete structure 8.

[0033] S4: Installation steps for the crimping assembly: Place the precast joint steel plate 1 (thickness between 8mm and 12mm) of the overlapping area stably above the waterstop overlapping area 6, ensuring that the four corner openings of the precast joint steel plate 1 are accurately aligned with the pre-determined corresponding positions of the concrete structure 8. Then, insert the first M16 expansion bolt 5a into the hole and gradually tighten the bolt using a wrench to the specified torque. The expansion bolt provides sufficient crimping capacity to crimp the waterstop overlapping area 6, the cold-bonded anti-seepage layer, and the precast joint steel plate 1 of the overlapping area into a single structure. Using the same method, fix the precast steel plate 2 of the non-overlapping area to the outside of the precast joint steel plate 1 of the overlapping area using the second expansion bolt 5b.

[0034] S5: During the cold-applied waterproofing layer construction, the elastic waterproofing adhesive (such as polyurethane, silicone, or polyurea) is loaded into the needle injector, and the injection needle is inserted into the gap 7. The syringe piston is slowly pushed to inject the sealant at appropriate pressure and speed, observing continuously to ensure the waterproofing adhesive fills the entire space evenly, densely, and without air bubbles or voids. The injection volume is determined reasonably according to the size of the space, generally about 1-3 kg per linear meter. Throughout the construction process, quality checks should be conducted continuously, such as checking for any omissions, whether the upper and lower waterstops are tightly connected, whether the waterstops adhere to the concrete structure, and whether the gaps are fully filled. Problems should be identified and resolved promptly to ensure that the joint waterproofing structure ultimately achieves the expected anti-seepage and deformation-adaptive effects.

[0035] The beneficial effects of this embodiment are:

[0036] (1) Improved connection strength: The composite seepage prevention structure with cold bonding and pressing ensures the stability of the pressing components under water pressure and structural deformation force, and the cold bonding seepage prevention layer improves the seepage prevention effect of the joint; the seepage prevention structure of the waterstop joint of this utility model will not cause structural damage and leakage when subjected to 1.2MPa water pressure and ±20% structural deformation.

[0037] (2) Excellent sealing performance: It fills the horizontal and vertical gaps tightly, and the cold-bonded anti-seepage layer formed fills the gaps that will inevitably be formed between the lower waterstop and the upper waterstop, as well as between the waterstop and the concrete structure, reducing the risk of leakage and ensuring waterproofing and structural safety.

[0038] (3) Convenient and efficient construction: The construction method and steps are clear and easy to operate, which is easy for construction personnel to master. The material cools down quickly, which can save costs while improving work efficiency and ensuring the safety of the underpass structure at the road-bridge junction.

Claims

1. A quick-connect seepage prevention structure for waterstops used in underpass structures at road-bridge junctions, characterized in that... The quick-connect seepage prevention structure of the waterstop includes adjacent overlapping waterstop bodies, a pressing component, and a cold-bonded seepage prevention layer. The waterstop body is laid on the surface of the concrete structure. The splicing end of the waterstop body on one side extends from the surface of the concrete structure to the top of the splicing end of the waterstop body on the other side to form a waterstop overlap area. The waterstop body on one side is the upper waterstop, and the waterstop body on the other side is the lower waterstop. The pressing assembly includes a precast joint steel plate for the overlapping area and a precast steel plate for the non-overlapping area. The precast joint steel plate for the overlapping area is disposed above the overlapping area of ​​the waterstop and is pressed and fixed to the concrete structure surface by a plurality of first expansion bolts. The precast steel plates for the non-overlapping area are respectively disposed on the waterstop body on both sides of the overlapping area of ​​the waterstop and are pressed and fixed to the concrete structure by a plurality of second expansion bolts. The cold-bonded seepage-proof layer is an elastic waterproof colloid filled in the gaps, which are formed by the upper waterstop, the splicing ends of the lower waterstop, and the surface of the concrete structure.

2. The waterstop quick-connect seepage prevention structure for underpass structures at road-bridge junctions according to claim 1, characterized in that... The upper and lower waterstops are bonded together in the overlapping area of ​​the waterstop.

3. The waterstop quick-connect seepage prevention structure for underpass structures at road-bridge junctions according to claim 1, characterized in that... The splicing ends of the lower waterstop are sloping at 30°-45°.

4. The waterstop quick-connect seepage prevention structure for underpass structures at road-bridge junctions according to claim 1, characterized in that... The elastic waterproof adhesive is one of polyurethane adhesive, silicone adhesive, or polyurea adhesive.

5. A quick-connect seepage prevention structure for a waterstop in a road-bridge junction underpass structure according to claim 1, characterized in that... The dimensions of the prefabricated joint steel plate in the overlapping area are the same as those of the overlapping area of ​​the waterstop. The four corners of the prefabricated joint steel plate in the overlapping area are perforated to allow the first expansion bolt to pass through.

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