Cast-in-place prestressed concrete box girder web toughness enhancement structure

Abstract

This utility model discloses a structure for improving the toughness of the web of a cast-in-place prestressed concrete box girder, comprising bolts, an adhesive layer, and a steel plate sequentially arranged on the inner side of the box girder web body. The adhesive layer consists of an injection layer and several spacers, with the injection layer supported internally by the spacers. The steel plate is positioned for bolt fixing, with the bolts equidistantly spaced. The steel plate is tightly connected to the box girder web body via the adhesive layer. This utility model solves the problem of the small structural dimensions of the web of a cast-in-place prestressed concrete box girder. By adding an adhesive layer of a certain thickness, the tightness between the box girder web body and the steel plate is further strengthened, thereby improving the toughness and durability of the cast-in-place prestressed concrete box girder web. This further ensures the integrity of the bridge structure and guarantees the safety of people's production and daily life.

Description

Technical Field

[0001] This utility model relates to the field of bridge structure technology, and in particular to a structure for improving the toughness of the web of a cast-in-place prestressed concrete box girder. Background Technology

[0002] In recent years, with economic and social development, transportation volume has increased significantly. High traffic density and heavy vehicle loads have become common phenomena. A number of bridges built in earlier years with lower construction standards and less material usage are already overburdened and aging rapidly. The issue of the small web structure dimensions of cast-in-place prestressed concrete box girders has attracted widespread attention.

[0003] In the existing technology, due to the small structural dimensions of the web of cast-in-place prestressed concrete box girders, after several years of use in bridge engineering, many diagonal cracks appear in the web of the box girder. The diagonal cracks are structural stress cracks, and some cracks exceed the limit in width, which means that the bridge has defects, which reduces the overall safety of the bridge project and seriously affects people's production, life and traffic safety.

[0004] Those skilled in the art are dedicated to solving the aforementioned technical deficiencies. Utility Model Content

[0005] In view of the above-mentioned defects of the prior art, the present invention provides a structure for improving the toughness of the web of a cast-in-place prestressed concrete box girder, the purpose of which is to improve the durability and toughness of the box girder web.

[0006] To achieve the above technical objectives, this utility model provides a structure for improving the toughness of the web of a cast-in-place prestressed concrete box girder, including a box girder web body, wherein a steel plate is pasted on the inner side of the box girder web body to increase the structural dimensions of the box girder web.

[0007] The adhesive layer consists of an adhesive injection layer and several pads, with the adhesive injection layer supported inside the adhesive layer by the several pads.

[0008] The steel plate is positioned for bolt fixing, and the bolts are spaced equidistantly.

[0009] The steel plate is tightly bonded to the body of the box girder web through an adhesive layer.

[0010] Preferably, the bolt is an M12 type.

[0011] Preferably, the steel plate has a thickness of 10 mm.

[0012] Preferably, the thickness of the adhesive layer is 3 mm.

[0013] Preferably, the thickness of the pad is 3 mm.

[0014] The beneficial effects of this utility model are:

[0015] Due to the above-mentioned structural design, this utility model, by adding an adhesive layer of a certain thickness, avoids situations such as gaps in the installed steel plates, so that the concrete of the box girder web and the steel plate are tightly bonded together, the rigidity of the bridge is strengthened, and a whole structure is formed. This ensures that the box girder web body is not prone to diagonal cracks, further ensuring the integrity of the bridge structure and protecting people's production and life safety. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 for Figure 1 Enlarged structural diagram at point A in the middle.

[0018] In the diagram: 1. Box girder web body, 2. Bolts, 3. Adhesive layer, 4. Pad, 5. Steel plate. Detailed Implementation

[0019] The following will further explain the concept, specific structure and technical effects of this utility model in conjunction with the accompanying drawings, so as to fully understand the purpose, features and effects of this utility model.

[0020] Example:

[0021] like Figures 1-2 As shown, the cast-in-place prestressed concrete box girder web toughness enhancement structure includes a box girder web body 1. The inner side of the box girder web body 1 is provided with bolts 2, an adhesive layer 3, spacers 4, and a steel plate 5. The adhesive layer is composed of the adhesive layer 3 and several spacers 4. The adhesive layer 3 is supported inside the adhesive layer by several spacers 4. The steel plate 5 is positioned for fixing with bolts 2. The steel plate 5 is tightly connected to the box girder web body 1 through the adhesive layer, further ensuring the stability of the steel plate 5 and the box girder web body 1.

[0022] The main innovation of this utility model is that by adding an adhesive layer of a certain thickness, the tightness between the web of the box girder and the steel plate is further enhanced, thereby improving the toughness and durability of the web of the cast-in-place prestressed concrete box girder.

[0023] Furthermore, bolts 2 are installed between the steel plate 5 and the web body 1 of the box girder to ensure the stability of the steel plate 5.

[0024] Construction process of this utility model:

[0025] 1. Clean the surface. Specifically, for the inner bonding surface of the box girder web body 1, first use a stiff brush dipped in high-efficiency detergent to brush away the surface oil and dirt, then grind the bonding surface to remove the 2-3mm thick surface layer until the new surface is completely exposed, and blow away the dust with oil-free compressed air.

[0026] 2. Install bolt 2. Specifically, determine the positions of steel plate 5 and bolt 2 on the bonding surface of the box girder web 1. To avoid damaging the original component reinforcement (and prestressing tendons) during drilling, a reinforcement detector can be used to determine the reinforcement position. To avoid internal reinforcement, the hole position may be appropriately moved. Then install bolt 2, ensuring it is firmly embedded and has reliable pull-out resistance. The design pull-out resistance of M12 bolts is not less than 23.2KN, and the insertion depth is 100mm.

[0027] 3. Install steel plate 5. Specifically: Based on the actual situation of bolts 2 on site, drill holes for the steel plate 5 to be pasted. Use a wire brush grinder or polishing wheel to remove rust and roughen the pasting surface of the steel plate 5. The roughness should be as high as possible, and the grinding lines should be perpendicular to the direction of force on the steel plate. Lift the 10mm thick steel plate 5 and suspend it on each bolt, then tighten the nuts.

[0028] 4. Adhesive layer: Specifically, a 3mm thick adhesive layer is applied between the bonding surface of the box girder web 1 and the steel plate 5. To ensure the thickness of the adhesive layer, a 3mm thick spacer is placed between the bonding surface of the box girder web 1 and the steel plate 5. During this process, the perfect combination of the adhesive layer 3 and the spacer 4 ensures the tightness between the bonding surface of the box girder web 1 and the steel plate 5, allowing for more effective pressure application when bonding the steel plate 5, thus significantly improving the crack resistance of the box girder web.

[0029] In summary, the structure for improving the toughness of the web of cast-in-place prestressed concrete box girders has been realized; this technology has been applied in many projects, greatly improving the durability of the projects.

[0030] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. Cast-in-place prestressed concrete box girder web toughness improvement structure, comprising bolts, adhesive layers and steel plates arranged in sequence on the inner side of the box girder web body, characterized in that: the adhesive layer is composed of a glue injection layer and a plurality of pads, and the glue injection layer is supported inside the adhesive layer by the plurality of pads; the steel plates are arranged equidistantly between the bolts; and the steel plates are connected to the box girder web body in close contact through the adhesive layers. The bolts are M12 type. The steel plates are 10 mm thick. The glue injection layer is 3 mm thick.

2. The cast-in-place prestressed concrete box girder web toughness improvement structure according to claim 1, characterized in that: The pads are 3 mm thick.

3. The cast-in-place prestressed concrete box girder web toughness enhancing structure according to claim 1, characterized in that: ​ 4. The cast-in-place prestressed concrete box girder web toughness enhancing structure according to claim 1, characterized in that: ​ 5. The cast-in-place prestressed concrete box girder web toughness enhancing structure according to claim 1, characterized in that: ​

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