Internal pulling type single-side bolt fixing device

Abstract

The utility model discloses an internal pulling type unilateral fixing bolt device, which belongs to the technical field of building construction, and comprises a screw rod, an E-shaped buckle and a nut, and the screw rod is provided with a first end and a second end; the first end is of a hook structure and used for being hooked and fixed to a reinforcing steel bar in a to-be-poured concrete structure. And the second end is provided with a thread, is used for penetrating through the template on one side and an external back ridge, and is matched with the mountain-shaped buckle and the nut outside the template on the side to realize fastening. According to the utility model, only the exposed screw head on the single side needs to be processed after the formwork is removed, so that half of the cutting and repairing workload is reduced, the construction efficiency and the concrete surface quality are improved, and the formwork reinforcing device is suitable for reinforcing formworks of concrete structures such as silo funnel plates and the like.

Description

Technical Field

[0001] This utility model belongs to the field of building construction technology, and specifically relates to an internal pull-type single-sided fixing bolt device. Background Technology

[0002] In modern industrial buildings, especially in silo structures used for storing materials such as grain, cement, and coal, the funnel plate is a key load-bearing and flow-guiding component. With the development of engineering technology, the design of funnel plates tends to have a large slope and be ultra-thick. Due to the large slope of the funnel plate, a double-sided formwork construction method is usually adopted to ensure the quality of concrete pouring and the forming effect.

[0003] The common method for reinforcing double-sided formwork is using tie bolts. These tie bolts penetrate both sides of the formwork and the area to be poured concrete, with both ends fixed to the outer back ribs (such as double steel pipes) of the formwork using U-shaped buckles and nuts. This resists the lateral pressure of the concrete and maintains the formwork spacing. However, this method has significant drawbacks: after the concrete is poured and reaches the demolding strength, both ends of the tie bolts are exposed outside the concrete structure surface. Construction workers must cut the bolt heads on both sides of the structure and seal and repair the holes left after cutting. This not only consumes a lot of time and manpower, increasing construction costs, but the repair work on both sides can easily affect the flatness of the concrete surface and the overall appearance quality, especially for structures with limited internal space or high requirements for internal surface quality (such as the inner wall of a silo funnel), where the operation is difficult and the effect is unsatisfactory. Summary of the Invention

[0004] Purpose of the invention: The purpose of this utility model is to address the shortcomings of the existing technology by providing an internal pull-type single-sided fixing bolt device. This addresses the defects caused by the use of tie bolts for reinforcement, specifically solving the problem that after concrete molding, bolt heads need to be cut off and holes repaired on both sides of the structure, resulting in time-consuming and labor-intensive work and affecting the surface quality of the structure.

[0005] Technical solution: The internal pull-type single-sided fixing bolt device of this utility model is used for concrete formwork reinforcement, including a screw, a U-shaped buckle and a nut. The screw is used to cooperate with the U-shaped buckle and the nut to apply a fastening force to the formwork.

[0006] The screw has a first end and a second end; the first end is formed into a hook structure, which is used to hook onto the reinforcing bars inside the concrete structure to be poured in the installed state; the second end is provided with a thread, which is used to pass through at least the outer template and the back rib outside the side template, and cooperate with the mountain-shaped buckle and nut outside the side template to achieve fastening.

[0007] To further improve the above technical solution, the hook structure at the first end is a 180° hook.

[0008] Furthermore, the hook structure at the first end is suitable for fixing to the reinforcing bar by welding.

[0009] Furthermore, the back rib includes timber and steel pipe, and the second end of the screw passes through the outer template, timber and steel pipe in sequence. The U-shaped buckle and nut are fastened to the second end of the screw on the outside of the steel pipe.

[0010] Furthermore, the hook structure at the first end is completely located inside the area to be poured concrete when installed, without protruding from any formwork.

[0011] Furthermore, the structural design of the device ensures that after the concrete pouring is completed and the formwork is removed, the exposed end of the screw that needs to be treated is formed only on the concrete surface corresponding to the outer formwork through which the second end of the screw protrudes.

[0012] Beneficial effects: Compared with the prior art, the advantages of this utility model are:

[0013] 1. Simplified post-processing procedures: Since one end of the screw is anchored inside the structure, only the exposed screw head on one side needs to be processed after demolding, reducing the workload of screw head removal and hole repair by half.

[0014] 2. Improved construction efficiency: Reduced post-processing workload, directly shortened construction period, and saved labor costs.

[0015] 3. Improve the appearance of structural quality: It avoids cutting and repairing the concrete surface on the other side of the structure (usually the inner side or the side that is difficult to handle), ensuring the integrity and flatness of the surface on that side, and improving the overall project quality and aesthetics.

[0016] 4. Simple structure and easy operation: The device itself has a simple structure and clear installation steps, making it easy for construction personnel to master and operate. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] In the diagram: 1. Screw; 2. U-shaped buckle; 3. Nut; 4. Steel pipe; 5. Bottom reinforcing bar; 6. Formwork; 7. Timber; 8. Bottom support frame. Detailed Implementation

[0019] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings, but the protection scope of this utility model is not limited to the described embodiments.

[0020] Example 1: As Figure 1 As shown, the pull-in type single-sided fixing bolt device provided in this embodiment includes a specially designed screw 1, a standard mountain-shaped buckle 2, and a nut 3.

[0021] Among them, screw 1 is the core component of this device, which has a unique structure: its first end is machined into a 180° hook for internal anchoring; its second end is machined with a standard thread for external fastening.

[0022] In specific applications, such as the reinforcement construction of double-sided formwork 6 for silo funnel plates: First, the bottom support frame 8 is erected according to the design requirements, and the bottom formwork 6 (as the inner formwork) and the bottom reinforcing steel 5 required for the structure are laid. Then, the first end (hook end) of the screw 1 of this utility model is reliably hooked onto the appropriate position of the bottom reinforcing steel 5. To prevent displacement during subsequent construction and concrete pouring and to ensure stable anchoring, spot welding is preferably used to weld the hook end to the reinforcing steel 5.

[0023] Tie the upper layer of reinforcing bars according to the design and install the top formwork 6 (as the outer formwork). The top formwork 6 needs to have corresponding holes drilled in advance according to the arrangement position of the screw rod 1 so that the second end (threaded end) of the screw rod 1 can pass through.

[0024] A back bracing system, comprising timber 7 and steel pipe 4, is laid on the outside of the top template 6. The timber 7 is tightly attached to the template 6, while the steel pipe 4 presses down on the timber 7, forming an effective force transmission path. The second end (threaded end) of the screw 1 passes sequentially through the top template 6, the timber 7, and the steel pipe 4.

[0025] On the outside of the steel pipe 4, the U-shaped buckle 2 is fitted onto the threaded end of the screw rod 1, and then the nut 3 is tightened. Tightening the nut 3 generates a strong tensile force, which is transmitted to the top formwork 6 through the U-shaped buckle 2, the steel pipe 4, and the timber 7, firmly pulling the top formwork 6 towards the internal anchoring point formed by the first end of the screw rod 1 anchored to the bottom reinforcing bar 5. This effectively fixes the distance between the inner and outer formwork 6, resisting the lateral pressure during concrete pouring and ensuring the structural dimensions and shape.

[0026] Using the reinforcement method of this utility model, the first end (hook end) of the entire screw 1 and its connection point with the reinforcing bar 5 are completely located inside the concrete area to be poured. After the concrete 7 is poured and the demolding conditions are met, the inner and outer formwork 6 are removed. At this time, only the exposed end of the screw 1 will remain on the concrete surface on one side of the top formwork 6 (i.e., the side where the second end of the screw 1 protrudes). Construction workers only need to cut the screw head and repair the holes on this side. The concrete surface on the other side (the bottom formwork side) remains intact and requires no treatment, greatly simplifying the work and improving efficiency and quality.

[0027] The specific construction steps for the pull-in type single-sided fixing bolt device provided by this utility model are as follows:

[0028] Step 1: All materials are prepared, inspected and approved, and safety technical instructions are given in place;

[0029] Step 2: The bottom support frame 8 is erected in place according to the design requirements;

[0030] Step 3: Lay the bottom formwork 6 and bottom reinforcing bars 5;

[0031] Step 4: Install screw 1, hook one end of its bent end onto the bottom reinforcing bar 5 and spot weld it in place;

[0032] Step 5: Lay the concrete slab reinforcement bars and lay the top formwork 6. Drill holes in the formwork 6 in advance according to the position of the screw 1.

[0033] Step 6: Lay the timber 7 and steel pipe 4, and tighten the bolt 1 with the U-shaped buckle 2 and nut 3;

[0034] Step 7: After the formwork system has been accepted, pour concrete and arrange for dedicated safety personnel to supervise the process.

[0035] Step 8: After the work is completed and the concrete strength reaches the demolding condition, remove formwork 6. At this time, only one side of the screw head needs to be cut off and the other side of the forming surface needs to be repaired.

[0036] This utility model's internal pull-type single-sided fixing bolt device, through its ingenious design of internally anchoring one end to the reinforcing bar and externally threading the other end, successfully overcomes the problem of traditional tie bolts requiring post-demolding treatment on both sides of the concrete structure. It has significant practical value and economic benefits, and is particularly suitable for concrete structure construction where high surface quality requirements on one side are required or where operating space is limited.

[0037] As described above, although the present invention has been shown and described with reference to specific preferred embodiments, it should not be construed as limiting the present invention itself. Various changes in form and detail may be made to the present invention without departing from the spirit and scope of the appended claims.

Claims

1. A pull-in type single-side fixing bolt device for reinforcing a concrete formwork (6), comprising a screw rod (1), a mountain-shaped buckle (2) and a nut (3), the screw rod (1) being used to cooperate with the mountain-shaped buckle (2) and the nut (3) to apply a fastening force to the formwork (6), characterized in that: the screw rod (1) has a first end and a second end; the first end is formed as a hook structure which is used to hook on a steel bar (5) inside a structure to be cast in a mounted state; the second end is provided with a thread which is used to pass through at least an outer side formwork (6) and a back brace outside the side formwork (6) and cooperate with the mountain-shaped buckle (2) and the nut (3) outside the side formwork (6) to realize fastening. The hook structure of the first end is a 180° hook. The hook structure of the first end is adapted to be fixed on the steel bar (5) by welding. The back brace comprises a wooden square (7) and a steel pipe (4), the second end of the screw rod (1) passes through the outer side formwork (6), the wooden square (7) and the steel pipe (4) in sequence, and the mountain-shaped buckle (2) and the nut (3) cooperate with the second end of the screw rod (1) outside the steel pipe (4) to realize fastening.

2. The inside pull single sided fixed bolt device of claim 1, wherein, The hook structure of the first end is completely located inside a region to be cast in a mounted state and does not pass out of any formwork (6).

3. The inside pull single sided fixed bolt device according to claim 1 or 2, characterized in that, The structural design of the device makes it so that, after the concrete is cast and the formwork (6) is removed, only the outer side formwork (6) corresponding to the concrete surface where the second end of the screw rod (1) passes out forms a screw rod exposed end which needs to be treated.

4. The inside pull single side fixed bolt device according to claim 1, wherein, ​ 5. The inside pull single side fixed bolt device according to claim 1, wherein, ​ 6. The inside pull single side fixed bolt device according to claim 1, wherein, ​

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