Portable railway box girder protection wall conical pre-crack forming device

Abstract

The utility model relates to the field of railway box girder protection wall construction, in particular to a portable railway box girder protection wall conical pre-crack forming device which is provided with a forming template, conical steel bars are arranged on the inner side of the forming template, and the conical steel bars are fixedly connected with the forming template through connecting bolts. Before concrete is poured, the conical steel bars are placed on the inner side of the forming formwork at the design position of the protective wall in advance, the conical steel bars and the forming formwork are fixedly installed through the connecting bolts, and through a conical structure formed by the two sets of forming faces, a preset crack shape is formed in the concrete hardening process; the width and the depth of a crack are accurately controlled through a conical structure formed by the two sets of molded surfaces, it is ensured that the concrete structure can crack according to a preset path when bearing external force, and therefore stress is effectively released, structural damage is avoided, and after machining is finished, fixed connection between the conical steel bars and the molding formwork is relieved by removing the connecting bolts; therefore, the conical steel bar can be disassembled quickly and conveniently.

Description

Technical Field

[0001] This utility model relates to the field of railway box girder protective wall construction, specifically to a portable conical pre-crack forming device for railway box girder protective walls. Background Technology

[0002] As a crucial component of the railway transportation system, the durability and safety of railway bridge structures directly impact the safety and stability of railway operations. Box girder retaining walls are key protective structures in the construction of high-speed railways and railway bridges, primarily used to ensure track safety and bridge stability. As a critical part of the bridge's superstructure, the construction quality of the box girder retaining wall significantly influences the overall waterproofing and collision resistance of the bridge. Bridge retaining walls are typically constructed using high-strength concrete or reinforced concrete, sometimes reinforced with steel plates. During fabrication, on-site casting is usually the primary method, with steel formwork assembled using bolts, balancing ease of installation and stability.

[0003] Pre-cracking technology, as an effective crack control method, has been widely used in the construction of concrete structures. However, traditional pre-crack forming methods suffer from problems such as low forming accuracy and low construction efficiency, making it difficult to meet the high standards required for modern railway bridge construction. Therefore, a portable conical pre-crack forming device for railway box girder protective walls is proposed. Utility Model Content

[0004] In order to solve the technical problems existing in the prior art, the present invention provides a portable conical pre-crack forming device for railway box girder protective walls.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a portable railway box girder protective wall conical pre-crack forming device, including a forming template, wherein a conical steel strip is provided on the inner side of the forming template, and the conical steel strip is connected and fixed to the forming template by connecting bolts;

[0006] The tapered steel bar includes a forming surface, a connecting surface, and connecting holes. There are two sets of forming surfaces, which together with one set of connecting surfaces form a triangular structure. There are several sets of connecting holes, which are arranged on the side of the connecting surface. The connecting holes are provided with threaded structures that mate with connecting bolts.

[0007] Preferably, the top width of the molding surface is greater than the bottom width, and the two sets of molding surfaces form a conical structure that is larger at the top and smaller at the bottom. The outer surface of the molding surface is smoothed.

[0008] Preferably, the side of the connecting surface is provided with several sets of slots, and several sets of top blocks are installed in the slots accordingly. A spring rod is connected to the inner side of each top block.

[0009] Preferably, one end of the spring rod is fixedly connected to the inside of the groove on the side of the connecting surface, and the other end of the spring rod pushes the top block out of the groove, so that the outer side of the top block protrudes from the surface of the connecting surface.

[0010] Preferably, the connecting bolt has a hexagonal end with a hexagonal slot inside.

[0011] Preferably, two sets of limiting grooves are provided on the outer side of the connecting surface. The limiting grooves are perpendicular to the end faces of both ends of the tapered steel bar, and the two sets of limiting grooves are parallel to each other.

[0012] Preferably, the inner side of the forming template is provided with several sets of guide strips, and the guide strips are correspondingly connected to the limiting slide grooves.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] 1. This utility model features a forming template with tapered steel bars on its inner side. The tapered steel bars are connected and fixed to the forming template by connecting bolts. The tapered steel bars include forming surfaces, connecting surfaces, and connecting holes. There are two sets of forming surfaces, which together with one set of connecting surfaces form a triangular structure. Several sets of connecting holes are arranged on the side of the connecting surfaces, and the connecting holes are fitted with threaded structures that mate with the connecting bolts. During the construction of the railway box girder protective wall, the tapered steel bars are placed inside the forming template at the designed position of the protective wall before concrete pouring. The tapered steel bars are then fixed to the forming template by connecting bolts. The tapered structure formed by the two sets of forming surfaces creates a preset crack shape during the concrete hardening process. The tapered structure precisely controls the width and depth of the cracks, ensuring that the concrete structure can crack along a predetermined path when subjected to external forces, thereby effectively releasing stress and preventing structural damage. After processing, the tapered steel bars can be disassembled by removing the connecting bolts, allowing for quick and convenient disassembly.

[0015] 2. This utility model also features a top width greater than the bottom width of the forming surface, with the two forming surfaces forming a conical structure that is wider at the top and narrower at the bottom. The outer surface of the forming surface is smoothed. This conical structure facilitates the upward removal of the conical steel bar from the hardened concrete during disassembly. The smoothing of the outer surface makes the hardened concrete surface flat, reducing friction between the concrete and the forming surface and making it easier to disassemble the conical steel bar. One end of the spring rod is fixedly connected to the inside of the slot on the side of the connecting surface, and the other end of the spring rod pushes the top block out of the slot, causing the outer side of the top block to protrude from the surface of the connecting surface. When installing the conical steel bar, the top block abuts against the side of the forming template, and the spring rod connects the top block to the forming template. The plate is tightened, and during the tightening of the connecting bolts, the top block and spring rod exert pressure on the forming template, making the connecting bolts less likely to loosen after tightening. This makes the connection between the tapered steel strip and the forming template more stable and prevents the tapered steel strip from shaking due to loose bolts during concrete pouring, which would affect the quality of crack formation. Several sets of guide strips are set on the inner side of the forming template. The guide strips are connected to the limiting grooves. The tapered steel strip is limited by the cooperation of the guide strips and the limiting grooves, making it easy to position the tapered steel strip when it is installed on the side of the forming template. At the same time, it prevents the tapered steel strip from being misaligned during the tightening of the connecting bolts, thus improving the installation efficiency. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0017] Figure 2 This is a schematic diagram of the three-dimensional structure of the back of this utility model;

[0018] Figure 3 This is a schematic diagram of the tapered steel bar structure of this utility model;

[0019] Figure 4 This is a partial cross-sectional view of the tapered steel bar of this utility model.

[0020] The numbers in the diagram represent:

[0021] 1. Forming template; 2. Tapered steel bar; 21. Forming surface; 22. Connecting surface; 23. Connecting hole; 24. Top block; 25. Spring rod; 3. Connecting bolt; 4. Limiting groove; 5. Guide strip. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments, highlighting the above and other technical features and advantages of the present invention. However, the following embodiments are merely preferred embodiments of the present invention and are not exhaustive.

[0023] Example:

[0024] like Figure 1- Figure 4 As shown, this utility model provides a portable railway box girder protective wall conical pre-crack forming device, including a forming template 1, a conical steel strip 2 is provided on the inner side of the forming template 1, and the conical steel strip 2 is connected and fixed to the forming template 1 by connecting bolts 3;

[0025] The tapered steel bar 2 includes a forming surface 21, a connecting surface 22, and connecting holes 23. The forming surface 21 is provided in two sets, and the two sets of forming surfaces 21 and one set of connecting surfaces 22 form a triangular structure. The connecting holes 23 are provided in several sets, and the several sets of connecting holes 23 are arranged on the side of the connecting surface 22. The connecting holes 23 are provided with a threaded structure that mates with the connecting bolts 3.

[0026] During the construction of the railway box girder protective wall, before the concrete is poured, the tapered steel strip 2 is placed inside the forming template 1 at the designed position of the protective wall. The tapered steel strip 2 is fixed to the forming template 1 by the connecting bolts 3. The tapered structure formed by the two sets of forming surfaces 21 forms a preset crack shape during the concrete hardening process. The tapered structure formed by the two sets of forming surfaces 21 precisely controls the width and depth of the crack, ensuring that the concrete structure can crack along the predetermined path when subjected to external force, thereby effectively releasing stress and avoiding structural damage. After the processing is completed, the tapered steel strip 2 is removed from the forming template 1 by removing the connecting bolts 3, and the tapered steel strip 2 can be disassembled quickly and conveniently.

[0027] The top width of the molding surface 21 is greater than the bottom width. The two molding surfaces 21 form a conical structure that is larger at the top and smaller at the bottom. The outer surface of the molding surface 21 is smoothed. The conical structure makes it easy to remove the conical steel bar 2 from the hardened concrete during disassembly. The smoothing of the outer surface makes the hardened concrete surface flat, reducing the friction between the concrete and the molding surface 21, and making it easier to disassemble the conical steel bar 2.

[0028] The connecting surface 22 has several sets of slots on its side, and several sets of top blocks 24 are installed in the slots. The top blocks 24 are connected to the inside of the slots by spring rods 25.

[0029] One end of the spring rod 25 is fixedly connected to the inside of the slot on the side of the connecting surface 22. The other end of the spring rod 25 pushes the top block 24 out of the slot, so that the outer side of the top block 24 protrudes from the surface of the connecting surface 22. When installing the tapered steel bar 2, the top block 24 abuts against the side of the forming template 1. The spring rod 25 presses the top block 24 against the forming template 1. During the tightening of the connecting bolt 3, the compression of the forming template 1 by the top block 24 and the spring rod 25 causes the forming template 1 to exert a compressive force on the connecting bolt 3, making it less likely for the connecting bolt 3 to loosen after tightening. This makes the connection between the tapered steel bar 2 and the forming template 1 more stable and prevents the tapered steel bar 2 from shaking due to loose bolts during concrete pouring, which would affect the forming quality of the crack.

[0030] The connecting bolt 3 has a hexagonal end with a hexagonal slot inside, allowing workers to tighten the connecting bolt 3 using different wrenches as needed, making operation convenient.

[0031] Two sets of limiting grooves 4 are provided on the outer side of the connecting surface 22. The limiting grooves 4 are perpendicular to the end faces of both ends of the tapered steel bar 2. The two sets of limiting grooves 4 are parallel to each other. The two ends of the limiting grooves 4 are connected to the end faces of both ends of the tapered steel bar 2.

[0032] Several sets of guide strips 5 are provided on the inner side of the forming template 1. The guide strips 5 are connected to the limiting grooves 4 in a corresponding manner. The guide strips 5 and the limiting grooves 4 are used to limit the conical steel strip 2, so that the conical steel strip 2 can be easily positioned when it is installed on the side of the forming template 1. At the same time, it prevents the conical steel strip 2 from being misaligned during the tightening of the connecting bolts 3, thereby improving the installation efficiency.

[0033] The above description is merely a preferred embodiment of the present utility model and is illustrative rather than restrictive. Those skilled in the art will understand that many changes, modifications, and even equivalents can be made within the spirit and scope defined by the claims of the present utility model, all of which will fall within the protection scope of the present utility model.

Claims

1. A portable railway box girder protection wall conical pre-crack forming device, characterized in that, It includes a forming template, and a tapered steel strip is provided on the inner side of the forming template. The tapered steel strip is connected and fixed to the forming template by connecting bolts. The tapered steel bar includes a forming surface, a connecting surface, and connecting holes. There are two sets of forming surfaces, which together with one set of connecting surfaces form a triangular structure. There are several sets of connecting holes, which are arranged on the side of the connecting surface. The connecting holes are provided with threaded structures that mate with connecting bolts.

2. The portable railway box girder protection wall conical presplitting forming device according to claim 1, characterized in that, The top width of the molding surface is greater than the bottom width, and the two sets of molding surfaces form a conical structure that is larger at the top and smaller at the bottom. The outer surface of the molding surface is smoothed.

3. The portable railway box girder protection wall conical pre-crack forming device according to claim 1, characterized in that, The side of the connecting surface is provided with several sets of slots, and several sets of top blocks are installed in the slots accordingly. A spring rod is connected to the inner side of each top block.

4. The portable railway box girder protection wall conical presplitting forming device according to claim 3, characterized in that, One end of the spring rod is fixedly connected to the inside of the groove on the side of the connecting surface, and the other end of the spring rod pushes the top block out of the groove, so that the outer side of the top block protrudes from the surface of the connecting surface.

5. The portable railway box girder protection wall conical pre-crack forming device according to claim 1, characterized in that, The connecting bolt has a hexagonal end with a hexagonal slot inside.

6. The portable railway box girder protection wall conical presplitting joint forming device according to claim 1, characterized in that, Two sets of limiting grooves are provided on the outer side of the connecting surface. The limiting grooves are perpendicular to the end faces of both ends of the tapered steel bar, and the two sets of limiting grooves are parallel to each other.

7. The portable railway box girder protection wall conical pre-crack forming device according to claim 1, characterized in that, The inner side of the forming template is provided with several sets of guide strips, which are connected to the limiting slide grooves.

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