Polyurea disposal structure for bridge structure cracks

Abstract

The utility model provides a polyurea treatment structure for bridge structure cracks, which is characterized in that a treatment unit is arranged on a crack plane, and the treatment unit comprises an epoxy resin primer layer, a polyurea interlayer bonding layer and a high-weather-resistance graphene polyurea finish paint layer which are sequentially brushed from bottom to top. Compared with a traditional method for filling and repairing bridge structure cracks through structural adhesive, the coating of the treatment structure is formed by brushing the epoxy resin primer, the polyurea waterproof paint and the high-weather-resistance graphene polyurea finish paint, the polyurea coating structure has more excellent protection performance, mechanical performance and ductility, and the bridge concrete structure is not prone to cracking again.

Description

Technical Field

[0001] This utility model relates to the field of bridge engineering technology, specifically to a polyurea treatment structure for cracks in bridge structures. Background Technology

[0002] In recent years, with the rapid development of my country's economy, the construction of expressways has accelerated, making expressway management increasingly arduous and complex, requiring constant attention to new problems and challenges. The maintenance and reinforcement of in-service bridges is a crucial area. With the continuous increase in the total length of highways in operation nationwide, the number of bridges in operational sections is unprecedented. Due to the influence of factors such as temperature and load, many bridges have developed numerous cracks of various types during operation. Some structural cracks significantly impact the stability and safety of the entire bridge, necessitating timely repair and long-term monitoring. However, the currently common method for maintaining and treating bridge structural cracks is to use structural adhesives to fill and smooth the cracks. But because structural adhesives have insufficient curing endurance, they are prone to cracking, making it difficult to achieve the desired maintenance and reinforcement. Utility Model Content

[0003] To address the current problems in the maintenance and treatment of cracks in bridge structures, this utility model proposes a polyurea treatment structure for bridge structural cracks. Compared with traditional structural adhesives, this coating structure has superior protective performance, mechanical properties, and ductility. By selecting different specifications of coatings according to the crack width, it can not only improve the waterproof and anti-corrosion performance of cracks, but also make the coating structure less prone to cracking due to its better ductility, thus extending the maintenance cycle.

[0004] A polyurea treatment structure for bridge structural cracks includes treatment units set on the crack plane. Each treatment unit comprises an epoxy resin primer layer, a polyurea interlayer adhesive layer, and a high weather-resistant graphene polyurea topcoat layer.

[0005] Furthermore, the thickness of the epoxy resin primer layer is 0.03-0.1 mm.

[0006] Furthermore, the thickness of the polyurea interlayer adhesive layer is 1.0-1.5 mm.

[0007] Furthermore, the thickness of the high weather-resistant graphene polyurea topcoat layer is 0.2-0.5 mm.

[0008] The technical effects of this utility model are:

[0009] The primer in this invention is a high-penetration epoxy resin, used to increase the adhesion between the overall coating structure and concrete; the intermediate layer is a polyurea waterproof coating, mainly for waterproofing, and also for repairing and leveling cracks in the bridge concrete substrate and bridge structure, while optimizing the mechanical properties (tensile strength, elongation at break) and ductility of the coating structure; the topcoat is a high-weather-resistant graphene polyurea material, which has good aging resistance, chloride ion resistance, and corrosion resistance. For bridge structural cracks of different sizes, the polyurea coating structure is used for targeted application to achieve the purpose of protection and maintenance. Attached Figure Description

[0010] Figure 1 This is a cross-sectional view of the polyurea coating structure.

[0011] Figure 2 This is a top view of the polyurea coating structure;

[0012] Figure 3 This is a schematic diagram of the polyurea coating structure installation.

[0013] In the diagram: 1 is the main body of the bridge, 2 is the structural crack on the bridge, 3 is the epoxy resin primer, 4 is the polyurea interlayer adhesive layer, 5 is the high weather-resistant graphene polyurea topcoat, 6 is the treated structural surface, 7 is the standard treatment unit, D1 is 30mm wide, D2 is 60mm wide, D3 is 100mm wide, and D is the width of the standard treatment unit. Detailed Implementation

[0014] The following detailed description, in conjunction with the accompanying drawings and specific embodiments, provides a polyurea treatment structure for bridge structural cracks according to the present invention:

[0015] Example

[0016] Figure 1 This is a cross-sectional view of the polyurea coating structure, used as a repair coating applied to structural cracks. In the figure, 1 represents the main body of the bridge, and 2 represents the structural cracks on the bridge. The polyurea coating structure mainly consists of an epoxy resin primer (3), a polyurea interlayer adhesive layer (4), and a high-weather-resistant graphene polyurea topcoat (5). The primer layer, excluding crack filling, has a thickness of 0.03-0.1 mm; the polyurea interlayer adhesive layer has a thickness of 1.0-1.5 mm; and the topcoat layer has a thickness of 0.2-0.5 mm. It is applied layer by layer using brushing or spraying techniques.

[0017] Figure 2 The image shows a top view of the polyurea coating structure. The figure shows the polyurea coating structure corresponding to three different brushing tools, where D1 is 30mm, D2 is 60mm, and D3 is 100mm. Different brushing tools are used according to the different widths of the cracks in the bridge structure, and the coating is applied with a standard length of 200mm.

[0018] Figure 3 This is a schematic diagram of the polyurea coating structure paving, where 1 represents a crack in the bridge structure, 2 represents the polyurea coating structure, and 3 represents a standard coating unit with a length of 200mm and a width of 60mm.

[0019] This invention proposes a polyurea coating structure for bridge structural cracks. Compared with the traditional method of filling and repairing bridge structural cracks with structural adhesive, this coating is composed of three layers: epoxy resin primer, polyurea waterproof coating, and high weather-resistant graphene polyurea topcoat. Compared with the traditional method of filling cracks with structural adhesive, the polyurea coating structure has better protective performance, mechanical properties, and ductility, making the bridge concrete structure less prone to cracking again.

[0020] The embodiments of the present utility model have been described in detail above. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model, and should also be considered within the protection scope of the present utility model.

Claims

1. A polyurea treatment structure for bridge structure cracks, characterized by, The treatment unit is arranged on the crack plane and comprises, from bottom to top, an epoxy primer layer, a polyurea interlayer adhesive layer and a high-weather-resistance graphene polyurea topcoat layer.

2. Polyurea treatment structure for bridge structure cracks according to claim 1, characterized in that, The thickness of the epoxy primer layer is 0.03-0.1 mm.

3. Polyurea treatment structure for bridge structure cracks according to claim 1, characterized in that, The thickness of the polyurea interlayer adhesive layer is 1.0-1.5 mm.

4. The polyurea treatment structure for bridge structure cracks according to claim 1, characterized by, The thickness of the high-weather-resistance graphene polyurea topcoat layer is 0.2-0.5 mm.

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