Narrow space prefabricated beam template bolt tensioning tool

Abstract

The utility model relates to building construction auxiliary tool technical field, concretely relates to a kind of narrow space prefabricated beam formwork bolt tightness tool;Including force arm rod and handheld operating rod, force arm rod one end is welded with for the sleeve joint bolt, the other end is equipped with force transmission tooth structure;Handheld operating rod can be inserted into force transmission tooth, and the labor-saving tightness operation to bolt is realized by lever principle. Force arm rod and handheld operating rod can be flexibly combined and disassembled, it is convenient to adjust use under different working conditions quickly;Its force transmission tooth structure design is reasonable, can multi-point force, effectively avoid skidding or tripping during operation process, significantly enhance the stability of torque transmission. The utility model structure is simple, and production cost is low, and operation is convenient, can be processed and made using common material of construction site, with very strong applicability and economy, especially suitable for the installation and disassembly of prefabricated beam formwork bolt in beam field narrow space, can effectively improve construction efficiency and safety, greatly reduce worker's labor intensity and operation risk.

Description

Technical Field

[0001] This utility model relates to the field of auxiliary tools for building construction, specifically to a bolt tightening and loosening tool for precast beam formwork in narrow spaces. Background Technology

[0002] In the construction of precast beams for railway and highway bridges, T-beams or box girders are typically characterized by their large height and complex structure. Due to the close arrangement of precast beam platforms and the narrow space between formwork legs, coupled with the large diameter of the connecting bolts (commonly M24 and above), traditional manual wrenches or conventional power tools are difficult to use effectively, making operation extremely inconvenient. Construction workers often need to expend a significant amount of time and physical effort to install and remove bolts, which is not only inefficient but also poses safety hazards. While some extended rods or sleeve tools exist, they generally suffer from poor compatibility, insufficient torque transmission, and slippage. Therefore, developing a bolt tightening tool that is simple in structure, labor-saving in operation, and easy to use in confined spaces is of significant practical importance for improving the efficiency of precast beam construction and reducing labor intensity. Summary of the Invention

[0003] This utility model addresses the technical problem of low efficiency in bolt installation and removal in confined spaces by providing a bolt tightening tool for precast beam formwork in confined spaces. The tool has a reasonable structure, is easy to operate and manufacture, and effectively utilizes the lever principle to achieve labor-saving operation, significantly improving construction efficiency.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: a bolt tightening and loosening tool for precast beam templates in narrow spaces, including a lever arm and a hand-held operating rod. One end of the lever arm is coaxially welded with a sleeve for fitting bolts, and the outer wall near the end of the other end is welded with several force-transmitting teeth. The plane of the force-transmitting teeth is perpendicular to the lever arm. The hand-held operating rod is a hollow tubular structure, and one end of the hand-held operating rod is provided with a handle.

[0005] Furthermore, the force transmission teeth are steel bars, and there are four of them. Two of them are grouped together and welded to both sides of the lever arm. The two steel bars in the same group are located on the same straight line, and the steel bars in different groups are located in different planes. The distance between the planes of the steel bars in different groups is 5-10cm.

[0006] Furthermore, the reinforcing bars are 5-15cm long HRB400 Φ20 reinforcing bars.

[0007] Furthermore, the sleeve is a 50mm sleeve, and the inner diameter of the sleeve is 50mm across the sides.

[0008] Furthermore, the lever arm is a Q235 Φ48.3×3.6mm steel pipe with a length of 50-120cm.

[0009] Furthermore, the handheld operating rod is a Q235 Φ48.3×3.6mm steel pipe with a length of 100-150cm, and a 2m long Φ5mm nylon rope is wrapped around the end of the handheld operating rod to serve as the handle 5 of the handheld operating rod.

[0010] Compared with the prior art, the present invention has the following beneficial effects: This utility model of a bolt tightening tool can be directly fabricated using seamless steel pipes, sleeves, and short reinforcing bars commonly found on construction sites. It can be quickly formed through simple cutting and welding, offering advantages such as readily available materials, easy processing, and low cost. The entire tool set is compact, lightweight, and easy to carry and transport, making it ideal for construction environments with confined spaces and limited mobility, such as beam yards. Furthermore, the tool is simple to operate and significantly reduces labor, allowing construction workers to quickly learn how to use it, effectively improving work efficiency and safety. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of the bolt tightening and loosening tool for precast beam templates in narrow spaces according to this utility model.

[0012] Figure 2 This is a schematic diagram of the bolt tightening and loosening tool for precast beam templates in narrow spaces, as described in this utility model, in the usage state of a precast T-beam.

[0013] Figure 3 This is a schematic diagram of the bolt tightening and loosening tool for precast beam templates in narrow spaces, as described in this utility model, in the usage state of a precast box girder.

[0014] The markings in the image are as follows: 1-Lever arm, 2-Handheld operating lever, 3-Sleeve, 4-Force transmission gear, 5-Handle, 6-Far end of lever arm, 7-Proximal end of lever arm, 8-Far end of handheld operating lever, 9-Tie bolt for precast beam formwork base. Detailed Implementation

[0015] The present invention will be further described below with reference to specific embodiments. Example 1

[0016] like Figure 1 As shown, a bolt tightening and loosening tool for precast beam templates in narrow spaces includes a lever arm 1 and a handheld operating rod 2. One end of the lever arm 1 is coaxially welded with a sleeve 3 for fitting bolts, and the other end has a plurality of force transmission teeth 4 welded to its outer wall near the end. The plane of the force transmission teeth 4 is perpendicular to the lever arm 1. The handheld operating rod 2 is a hollow tubular structure, and one end of the handheld operating rod 2 is provided with a handle 5.

[0017] Furthermore, the force transmission tooth 4 is a steel bar, and there are four of them. Two of them are in a group and are welded to both sides of the lever arm 1 respectively. The two steel bars in the same group are located on the same straight line, and the steel bars in different groups are located in different planes. The distance between the planes where the steel bars in different groups are located is 5-10cm.

[0018] Furthermore, the reinforcing bars are 5-15cm long HRB400 Φ20 reinforcing bars.

[0019] Furthermore, the sleeve 3 is a 50mm sleeve, and the inner hole of the sleeve has a side dimension of 50mm.

[0020] Furthermore, the lever arm 1 is a Q235 Φ48.3×3.6mm steel pipe with a length of 50-120cm.

[0021] Furthermore, the handheld operating lever 2 is a Q235 Φ48.3×3.6mm steel pipe with a length of 100-150cm, and a 2m long Φ5mm nylon rope is wrapped around the end of the handheld operating lever 2 to serve as the handle 5 of the handheld operating lever.

[0022] The preparation process of the bolt tightening and loosening tools for precast beam formwork is as follows: (1) Lever arm The lever arm 1 is made of: a 50-120cm long Q235Φ48.3×3.6mm steel pipe, a 50 sleeve, and four 5-15cm long HRB400Φ20 steel bars, which are cut, welded, and ground; ① The 50 sleeve 3 is welded to the far end 6 of the 50-120cm long Q235Φ48.3×3.6mm steel pipe lever arm; ② The four 5-15cm long HRB400Φ20 steel bars are welded to the near end 7 of the lever arm in a "two-to-one welding" manner, with the two pairs staggered by 5-10cm to form force transmission teeth.

[0023] (2) Hand-held control lever The handheld operating lever 2 uses a 100-150cm long Q235Φ48.3×3.6mm steel pipe as the handheld operating lever, and a 2m long Φ5mm nylon rope is wrapped around it to serve as the handle 5 of the handheld operating lever.

[0024] ① Cut a 100-150cm long Q235Φ48.3×3.6mm steel pipe as the hand-held operating rod 2 and grind off the rough edges; ② Wrap a 15-20cm long Φ5mm nylon rope around the hand-held operating end of the hand-held operating rod 2 as the handle strap.

[0025] After completing the above steps, the tool for tightening and loosening bolts of the precast beam formwork in a narrow space is ready.

[0026] II. The working process of using the above-mentioned precast beam formwork bolt tightening and loosening tool is as follows: A. Work Preparation The operator moves the precast beam formwork bolt tightening and loosening tool in the narrow space to the specific location where it is needed, aligns one end of the lever arm 1 with the 50 sleeve 3 welded to it, aligns it with the tie bolt 9 of the precast beam formwork base, and then inserts the far end 8 of the hand-held operating lever 2 into the force transmission tooth 4 to complete the preparation for tightening and loosening the formwork bolts.

[0027] B. Use of tools The operator holds the handle 5 of the handheld operating lever 2 and, through the lever principle, presses down or lifts the handheld operating end to loosen or tighten a certain number of threads on the tie bolts 9 of the precast beam formwork base. When the handheld operating end (i.e., the handle 5 end) touches the ground or can no longer be lifted, the far end 8 of the handheld operating lever is inserted into other force transmission teeth 4, and the pressing down or lifting up of the handheld operating end is repeated until the tie bolts 9 of the precast beam formwork base are completely removed or tightened. The above operation is repeated to loosen or tighten other bolts until the process is complete.

[0028] C. Complete the assignment After all the tie bolts of the precast beam formwork base have been loosened or tightened, the operator pulls the hand-held operating lever 2 from the force transmission tooth 4 of the lever arm 1, removes the lever arm 1 from the last tie bolt 9 of the precast beam formwork base that has been loosened or tightened, and moves the tool to a designated stacking area for the next use.

[0029] This utility model discloses a bolt tightening and loosening tool for precast beam formwork in narrow spaces. It is a special tool used to tighten and loosen bolts during the installation and disassembly of precast beam formwork, and is especially suitable for working conditions with limited operating space in the formwork construction of large precast components such as T-beams and box girders.

[0030] The handheld operating lever 2 can be inserted into the force transmission teeth, achieving effortless tightening and loosening of bolts through the lever principle. This tool adopts a modular design; the lever arm 1 and the handheld operating lever 2 can be flexibly combined and disassembled, facilitating quick adjustment under different working conditions. Its force transmission teeth 4 have a reasonable structural design, allowing for multi-point force application, effectively preventing slippage or disengagement during operation, and significantly enhancing torque transmission stability. This utility model has a simple structure, low manufacturing cost, and convenient operation. It can be fabricated using common materials found on construction sites, requiring no special equipment, and possesses strong applicability and economy. It is particularly suitable for the installation and disassembly of precast beam formwork bolts in the narrow spaces of beam yards, effectively improving construction efficiency and safety, and significantly reducing worker labor intensity and operational risks.

Claims

1. A bolt tightening and loosening tool for precast beam formwork in a narrow space, characterized in that, It includes a lever arm (1) and a hand-held operating lever (2). One end of the lever arm (1) is coaxially welded with a sleeve (3) for connecting bolts, and the other end is welded with several force transmission teeth (4) on the outer wall near the end. The plane of the force transmission teeth (4) is perpendicular to the lever arm (1). The hand-held operating lever (2) is a hollow tubular structure, and one end of the hand-held operating lever (2) is provided with a handle (5).

2. The bolt tightening and loosening tool for precast beam formwork in a narrow space according to claim 1, characterized in that, The force transmission teeth (4) are steel bars, and there are four of them. Two of them are in a group and are welded to both sides of the lever arm (1). The two steel bars in the same group are located on the same straight line, and the steel bars in different groups are located in different planes. The distance between the planes where the steel bars in different groups are located is 5-10cm.

3. The bolt tightening and loosening tool for precast beam formwork in a narrow space according to claim 2, characterized in that, The reinforcing bars are 5-15cm long HRB400 Φ20 steel bars.

4. The bolt tightening and loosening tool for precast beam formwork in a narrow space according to claim 1, characterized in that, The sleeve (3) is a 50 sleeve, and the inner hole of the sleeve has a side dimension of 50 mm.

5. A bolt tightening and loosening tool for precast beam formwork in a narrow space according to claim 1, characterized in that, The lever arm (1) is a Q235Φ48.3×3.6mm steel pipe with a length of 50-120cm.

6. The bolt tightening and loosening tool for precast beam formwork in a narrow space according to claim 1, characterized in that, The handheld operating lever (2) is a Q235Φ48.3×3.6mm steel pipe with a length of 100-150cm. A 2m long Φ5mm nylon rope is wrapped around the end of the handheld operating lever (2) to serve as the handle (5) of the handheld operating lever.

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