An overall prefabricated installation construction method for building pipelines

Abstract

The present invention relates to the technical field of building construction, and specifically to an overall prefabricated installation construction method for building pipelines, which includes the following steps: using BIM technology to establish a basic pipe comprehensive model of the pipe gallery; by optimizing the basic plane, deepening the layout of professional pipelines, and establishing the final BIM model; according to the technological characteristics of prefabricated pipelines and the requirements of professional settings, determining the pipeline connection method; with the help of the established accurate BIM pipe; The beneficial effects are as follows: The overall prefabricated installation construction method for building pipelines proposed by the present invention uses BIM technology to decompose, arrange, and reorganize the pipe gallery, rationally utilize the space of the pipe gallery, separately process pipelines and pipe fittings in sections in the factory, and perform bolt connection through on-site prefabricated installation technology. On the premise of ensuring the overall stability and reliability of the system and facilitating maintenance, the irregular pipe gallery is reasonably and fully utilized, enabling the full integration of architectural aesthetics and functional systems.

Description

Technical Field

[0001] The present invention relates to the technical field of building construction, and specifically relates to an overall prefabricated installation construction method for building pipelines. Background Art

[0002] Building construction refers to various building structures and their affiliated facilities, as well as the installation works of the pipelines, equipment, and indoor and outdoor decoration works that are matched with them. "Building" refers to a project with a roof, beams, columns, walls, and a foundation that can form an internal space to meet the needs of people's production, residence, study, public activities, etc.

[0003] In the prior art, with the diverse development of building forms, people have higher and higher requirements for the use space. The novel building pattern directly affects the use of the functional corridor (pipe gallery), resulting in a narrow available space in the functional corridor (pipe gallery), which brings many impacts to the on-site construction.

[0004] Moreover, after the pipeline is lapped on the cross arm, the preset position of the hoop is fixed. Thus, when changing the pipeline layout spacing, it is necessary to reinstall the hoop, which increases the workload and is not conducive to improving the construction efficiency. Summary of the Invention

[0005] The purpose of the present invention is to provide an overall prefabricated installation construction method for building pipelines to solve the problems raised in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solution: An overall prefabricated installation construction method for building pipelines, the construction method includes the following steps:

[0007] Utilize BIM technology to establish the basic pipe integration model of the pipe gallery;

[0008] By optimizing the basic plane and deepening the layout of professional pipelines, establish the final BIM model;

[0009] According to the process characteristics of prefabricated pipelines and the requirements of professional settings, determine the pipeline connection method;

[0010] With the help of the established accurate BIM pipe gallery model, use Navisworks software to simulate the pipe gallery assembly construction process and disassemble the pipe gallery modularly;

[0011] After completing the BIM modeling and the disassembly task of the pipe gallery module, set up the supports according to the specifications, determine the support spacing and the section steel specifications of the supports, and establish the support BIM model;

[0012] Lay out the deepened and disassembled pipe sections, and reasonably decompose the pipelines according to the pipe section length;

[0013] Deliver the form of the shaped support and the stress calculation document to the support manufacturer, request the manufacturer to further review, and carry out factory processing according to the requirements;

[0014] According to the on-site reference line, accurately position the embedded steel plate assembly of the starting support, review the center distance between the two bracket arm embedded components, and control the parallelism of the axial line of the pipe gallery bracket arm;

[0015] Place the prefabricated pipe section on the crossbeam, and adjust the position and spacing of the fastening clips through the internal limiting mechanism inside the crossbeam;

[0016] Use a chain hoist to tightly hoist multiple crossbeams;

[0017] Use special supports to connect the bracket arms and the crossbeams. Through the mutual bolt connection of the holes on the supports and the bracket arms, the height of the crossbeam can be adjusted to be 2 cm or more, and within 2 cm, pipe shims are used for adjustment to ensure that the height of the crossbeam can be continuously adjusted, and then the crossbeam is leveled; by meshing the horizontal teeth of the connecting piece with the internal teeth of the crossbeam, adjust the specific position of the crossbeam to ensure uniform force on the crossbeam in the horizontal direction.

[0018] Preferably, when disassembling the pipe gallery modularly, split the large pipe gallery into multiple individual hoisting modules. The modules are connected end to end. The pipe sections within a single hoisting module are processed and sized separately, and flange interfaces are reserved at the pipe ends for connection between modules. Separate BIM families are established for each pipe section within the module as the basis for back-end processing and prefabrication. The pipe sections are individually coded and labeled with QR codes to display installation and positioning information.

[0019] Preferably, when establishing the BIM model of the support, use SolidWorks for stress analysis, review the support stress calculation document, and complete the shaping of the assembled support.

[0020] Preferably, when using a chain hoist to tightly hoist multiple crossbeams, for a single-layer pipe gallery module, install the support bracket arm columns before hoisting, then hoist the entire pipe row to the crossbeam part. After completing the bolt connection between the crossbeam and the bracket arm, lower the manual hoist to complete the unloading of the pipe row; when hoisting a multi-layer pipe row module, the module needs to be assembled integrally on the ground, and the manual hoist needs to be directly hung on the formal support bracket arm to complete the bolt connection with the embedded steel plate. For the bolt connection sequence between the bracket arm and the steel plate, first complete the hole alignment of the hoisting load-bearing support, and the non-load-bearing hoisting support cooperates to adjust the hole alignment position. After synchronously completing the hole alignment and bolt connection, lower the manual hoist to unload the load.

[0021] Preferably, the crossbeam includes a crossbeam body, a reserved groove, and a rubber cushion plate. The reserved groove is opened on the top surface of the crossbeam body, and the rubber cushion plate is fixed on the top surface of the crossbeam body. There are two groups of rubber cushion plates, which are symmetrically distributed with respect to the reserved groove. A pipe is lapped above the crossbeam body, and fastening clips are provided on both sides of the pipe.

[0022] Preferably, the fastening clip includes a hoop plate, a bolt, a rubber clamp and a slide plate. The hoop plate includes a connecting section, an arc section integrally formed below the connecting section, and a supporting section integrally formed at the lower end of the arc section. The bolts penetrate the connecting sections of the two sets of hoop plates and are locked. A plurality of rubber clamps are provided, and the plurality of rubber clamps are arranged and distributed along the inner annular surface of the arc section of the hoop plate, and the rubber clamps are fixed on the inner annular surface of the arc section.

[0023] Preferably, the slide plate is fixed to the bottom end of the supporting section of the hoop plate, and the slide plate is slidably connected in the reserved groove, a positioning plug-in is provided between the slide plate and the side wall of the reserved groove, and two groups of positioning plug-ins are provided, and the two groups of positioning plug-ins are symmetrically distributed about the hoop plate.

[0024] Preferably, the positioning plug-in includes a limit frame, a sealing plate, a positioning block, a positioning groove and a rubber clamp. The limit frame is a "匚"-shaped plate structure, the limit frame is fixed to the surface of the skateboard, the sealing plate is a "回"-shaped plate structure, the sealing plate is fixed to the top surface of the limit frame, one end of the positioning block is slidably connected between two parallel side plates of the limit frame, the other end of the positioning block is movably inserted in the positioning groove, and the positioning groove is opened on the side wall of the reserved groove.

[0025] Preferably, the rubber clamp is fixed between one end of the positioning block and the limit frame, a force unloading groove is provided on the surface of the rubber clamp, a toggle handle is fixed to the top surface of one end of the positioning block, the toggle handle is slidably connected in the groove body of the sealing plate, and a traction member is provided between the toggle handle and the hoop plate.

[0026] Preferably, the traction member includes a bolting groove, a traction rope, a first perforation, a second perforation and a traction handle. The bolting groove is an annular groove, which is arranged on the surface of the toggle handle, the first perforation is arranged on the surface of the hoop plate, and the second perforation is arranged on two parallel side walls of the first perforation. One end of the traction rope is bolted to the bolting groove, and the other end of the traction rope passes through the first perforation and the second perforation and is fixed to the surface of the traction handle.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The overall assembled installation construction method for pipes in a building proposed in the present invention uses BIM technology to decompose, arrange and reorganize the pipe gallery, rationally utilizes the pipe gallery space, processes the pipes and pipe fittings in sections in the factory, and bolts them together through on-site assembled installation technology. On the premise of ensuring the overall stability and reliability of the system and facilitating maintenance, the irregular pipe gallery is rationally and fully utilized, so that the architectural aesthetics and functional system are fully integrated; and the pipes are fixed on the crossarms with adjustable position fastening clips, so as to facilitate the adjustment of the pipe layout spacing. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the structure of the pipeline being limited behind the cross arm of the present invention;

[0030] Figure 2 for Figure 1 A schematic diagram of the structure enlargement in the middle;

[0031] Figure 3 It is a schematic diagram of the connection structure of two sets of hoop plates of the present invention;

[0032] Figure 4 It is a half-section schematic diagram of the bottom structure of the hoop plate of the present invention;

[0033] Figure 5 for Figure 4 A magnified schematic diagram of the structure at B in the middle;

[0034] Figure 6 This is a schematic diagram of the connection structure between the positioning plug block and the rubber clamp block of the present invention;

[0035] Figure 7 This is a schematic diagram of the installation structure of the rubber clamp strip of the present invention;

[0036] Figure 8 It is a schematic diagram of the cross arm body structure of the present invention.

[0037] In the figure: cross arm body 1, reserved groove 2, rubber pad 3, pipe 4, hoop plate 5, bolt 6, rubber clamp 7, slide plate 8, limit frame 9, sealing plate 10, positioning plug 11, positioning groove 12, rubber clamp 13, toggle handle 14, bolting groove 15, traction rope 16, perforation 1 17, perforation 2 18, traction handle 19. DETAILED DESCRIPTION

[0038] In order to make the purpose and technical solution of the present invention clearly and completely described, and the advantages more clearly understood, the embodiments of the present invention are further described in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, rather than all of the embodiments, and are only used to explain the embodiments of the present invention, and are not used to limit the embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] Embodiment 1

[0040] The present invention provides a technical solution: a construction method for integrally assembled installation of pipes in a building, the construction method comprising the following steps:

[0041] a. Use BIM technology to establish the basic pipe model of the pipe gallery to meet the space requirements; carry out professional deepening of the basic model, optimize the spatial layout, and make the pipelines meet the professional setting requirements;

[0042] b. By optimizing the basic plane, deepening the layout of professional pipelines, and establishing the final BIM model. Establish a standard family library for all fittings (such as flanges, pads, bolts, etc.) during the pipeline installation process.

[0043] c. According to the technological characteristics of prefabricated pipelines and the requirements of professional settings, determine the pipeline connection method. Priority should be given to connection methods that are convenient for on-site assembly, such as flange connection (for medium water supply and air-conditioning water) and grooved connection (for fire protection and rainwater drainage).

[0044] d. With the help of the completed accurate BIM pipe gallery model, use Navisworks software to simulate the assembly construction process of the pipe gallery and disassemble the pipe gallery modularly. Split the large pipe gallery into multiple individual hoisting modules, with the heads and tails of the modules connected end to end. The pipe segments within a single hoisting module are processed and sized separately, and flange interfaces are reserved at the pipe ends for connection between modules. Separate BIM families are established for each pipe segment within the module as the basis for back-office processing and prefabrication. The pipe segments are coded separately and labeled with QR codes, which can display installation positioning information.

[0045] e. After completing the BIM modeling and pipe gallery module disassembly tasks, set up supports according to the specifications, determine the support spacing and the specifications of the support steel profiles, and establish a support BIM model. Use SolidWorks for stress analysis, review the support stress calculation book, and complete the standardization of prefabricated supports.

[0046] f. Loft the pipe segments after in-depth disassembly, reasonably decompose the pipeline according to the pipe segment length, ensure the material utilization rate, reduce material losses, and deliver the results to the factory for processing.

[0047] g. Deliver the standardized support form and the support stress calculation book to the support manufacturer, require the manufacturer to further review, and carry out factory processing according to the requirements.

[0048] h. According to the on-site reference line, accurately position the embedded steel plate assembly of the starting support, review the center distance between the two bracket embedded components, and control the parallelism of the axial line of the pipe gallery bracket; embed the positioning of the prefabricated support and adjust the support angle.

[0049] i. Place the prefabricated pipe segments on the crossbeam, adjust the position and spacing of the fastening clips through the internal teeth of the crossbeam, so as to achieve the purpose of orderly adjustment of the pipeline spacing; use bolts to fix and clamp the two fastening clips on the pipeline (insulation blocks are added for insulated pipelines), and complete the installation of the prefabricated pipe segments at the ground.

[0050] j. Use a chain hoist to tightly hoist multiple crossbeams. For a single-layer pipe gallery module, before hoisting, first install the support bracket arm columns, then hoist the entire pipe row to the crossbeam position. After completing the bolt connection between the crossbeam and the bracket arm, lower the manual hoist to complete the unloading of the pipe row. When hoisting a multi-layer pipe row module, the module needs to be assembled integrally on the ground, and the manual hoist needs to be directly hung on the formal support bracket arm to complete the bolt connection with the embedded steel plate. For the bolt connection sequence between the bracket arm and the steel plate, first align the holes of the hoisting load-bearing bracket, and the non-load-bearing hoisting bracket cooperates to adjust the hole position. After synchronously completing the hole alignment and bolt connection, lower the manual hoist to unload the load;

[0051] k. Use special support parts to connect the bracket arm and the crossbeam. Through the mutual bolt connection of the holes on the support parts and the bracket arm holes, the height of the crossbeam can be adjusted by 2 cm or more. For adjustments within 2 cm, use pipe shims to ensure that the crossbeam height can be continuously adjusted, and then achieve the horizontal of the crossbeam; by meshing the horizontal teeth of the connecting parts with the internal teeth of the crossbeam, adjust the specific position of the crossbeam to ensure uniform force of the crossbeam in the horizontal direction;

[0052] The control key points to implement this construction method are to use BIM technology to finely establish a pipe and component library, reasonably disassemble large and special-shaped pipes after optimization, select a reasonable bracket form, introduce an assembly construction process, convert welding into bolt connection to simplify the construction process; assemble the pipes on the ground and then hoist them integrally.

[0053] Embodiment 2

[0054] Refer to the appendix Figures 1 to 8On the basis of the first embodiment, in order to adjust the position of the hoop plate 5, the cross arm includes a cross arm body 1, a reserved groove 2 and a rubber pad 3, the reserved groove 2 is arranged on the top surface of the cross arm body 1, the rubber pad 3 is fixed on the top surface of the cross arm body 1, and two groups of rubber pads 3 are provided, and the two groups of rubber pads 3 are symmetrically distributed about the reserved groove 2. A pipe 4 is overlapped on the top of the cross arm body 1, and fastening clips are provided on both sides of the pipe 4. The fastening clips include a hoop plate 5, a bolt 6, a rubber clamp 7 and a slide plate 8. The hoop plate 5 includes a connecting section, an arc section integrally formed below the connecting section, and an arc section integrally formed on the arc The support section at the lower end of the section, the bolt 6 penetrates the connecting section of the two groups of hoop plates 5 and is locked, a plurality of rubber clamps 7 are provided, and the plurality of rubber clamps 7 are arranged and distributed along the inner ring surface of the circular arc section of the hoop plate 5, and the rubber clamps 7 are fixed on the inner ring surface of the circular arc section, the slide plate 8 is fixed on the bottom end of the support section of the hoop plate 5, and the slide plate 8 is slidably connected in the reserved groove 2, and a positioning plug-in is provided between the slide plate 8 and the side wall of the reserved groove 2, and the positioning plug-in is provided with two groups, and the two groups of positioning plug-ins are symmetrically distributed about the hoop plate 5, and the positioning plug-in includes a limit frame 9, a sealing plate 10, a positioning plug-in block 11, a positioning groove 12 and a rubber clamp block 13, and the limit The positioning frame 9 is in the shape of a "匚" plate structure, the limiting frame 9 is fixed on the surface of the slide plate 8, the sealing plate 10 is in the shape of a "回" plate structure, the sealing plate 10 is fixed on the top surface of the limiting frame 9, one end of the positioning plug 11 is slidably connected between the two parallel side plates of the limiting frame 9, the other end of the positioning plug 11 is movably inserted in the positioning groove 12, the positioning groove 12 is provided on the side wall of the reserved groove 2, the rubber clamp 13 is fixed between one end of the positioning plug 11 and the limiting frame 9, the surface of the rubber clamp 13 is provided with a force unloading groove, and a toggle handle 14 is fixed on the top surface of one end of the positioning plug 11. The movable handle 14 is slidably connected in the groove body of the sealing plate 10. A traction member is provided between the toggle handle 14 and the hoop plate 5. The traction member includes a bolting groove 15, a traction rope 16, a through hole 17, a through hole 18 and a traction handle 19. The bolting groove 15 is an annular groove. The bolting groove 15 is opened on the surface of the toggle handle 14. The through hole 17 is opened on the surface of the hoop plate 5. The two parallel side walls of the through hole 17 are both provided with a through hole 18. One end of the traction rope 16 is bolted to the bolting groove 15, and the other end of the traction rope 16 passes through the through hole 17 and the through hole 18 and is fixed to the surface of the traction handle 19.

[0055] Pinch the traction handle 19 to tension the traction rope 16, and the traction toggle handle 14 slides along the groove body of the sealing plate 10. During this process, one end of the positioning plug 11 extends into the limit frame 9 to squeeze the rubber clamping block 13, causing elastic deformation of the rubber clamping block 13, and the other end of the positioning plug 11 disengages from the positioning groove 12. Thus, the sliding plate 8 is no longer restricted, and the sliding plate 8 can be toggled along the reserved groove 2 to adjust the position of the hoop plate 5. After releasing the traction handle 19, the rubber clamping block 13 rebounds to push the positioning plug 11 to rebound and insert into the nearest positioning groove 12 to limit the sliding plate 8. Pass the bolt 6 through the connecting sections of the two hoop plates 5 and lock it, and the two hoop plates 5 clamp and limit the pipeline 4.

[0056] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An overall prefabricated installation construction method for building pipelines Characterized in that The construction method includes the following steps: Using BIM technology to establish the basic pipe comprehensive model of the pipe gallery; By optimizing the basic plane, deepening the layout of professional pipelines, and establishing the final BIM model; According to the technological characteristics of prefabricated pipelines and the requirements of professional settings, determine the pipeline connection method; With the help of the established accurate BIM pipe gallery model, use Navisworks software to simulate the assembly construction process of the pipe gallery and disassemble the pipe gallery modularly; After completing the BIM modeling and the disassembly task of the pipe gallery module, set up the brackets according to the specifications, determine the bracket spacing and the section steel specifications of the brackets, and establish the bracket BIM model; Loft the deepened and disassembled pipe sections, and reasonably decompose the pipelines according to the pipe section length; Deliver the fixed bracket form and the force calculation book to the bracket manufacturer, require the manufacturer to further review, and carry out factory processing according to the requirements; According to the on-site reference line, accurately position the embedded steel plate assembly of the starting bracket, review the center distance between the two bracket arm embedded components, and control the parallelism of the axial line of the pipe gallery bracket arm; Place the prefabricated pipe section on the crossbeam, and adjust the position and spacing of the fastening clips through the internal limiting mechanism of the crossbeam; Use an electric hoist to tightly hoist multiple crossbeams; Use special supports to connect the bracket arms and the crossbeams. Through the mutual bolt connection of the holes on the supports and the holes on the bracket arms, the height of the crossbeam can be adjusted by more than 2 cm, and within 2 cm, pipe shims are used for adjustment to ensure that the height of the crossbeam can be continuously adjusted, and then the crossbeam is leveled; by meshing the horizontal teeth of the connecting piece with the internal teeth of the crossbeam, adjust the specific position of the crossbeam to ensure that the crossbeam is evenly stressed in the horizontal direction; The cross arm includes a cross arm body (1), a reserved groove (2), and a rubber cushion plate (3). The reserved groove (2) is opened on the top surface of the cross arm body (1), and the rubber cushion plate (3) is fixed on the top surface of the cross arm body (1). There are two groups of rubber cushion plates (3), and the two groups of rubber cushion plates (3) are symmetrically distributed with respect to the reserved groove (2). A pipeline (4) is lapped above the cross arm body (1), and fastening clips are provided on both sides of the pipeline (4); the fastening clip includes a hoop plate (5), a bolt (6), a rubber clip strip (7), and a sliding plate (8). The hoop plate (5) includes a connecting section, an arc section integrally formed below the connecting section, and a supporting section integrally formed at the lower end of the arc section. The bolt (6) passes through the connecting sections of the two hoop plates (5) and is locked. There are multiple rubber clip strips (7), and the multiple rubber clip strips (7) are arranged and distributed along the inner ring surface of the arc section of the hoop plate (5), and the rubber clip strips (7) are fixed on the inner ring surface of the arc section; the sliding plate (8) is fixed at the bottom end of the supporting section of the hoop plate (5), and the sliding plate (8) is slidably connected in the reserved groove (2). A positioning plug-in is provided between the sliding plate (8) and the side wall of the reserved groove (2). There are two groups of positioning plug-ins, and the two groups of positioning plug-ins are symmetrically distributed with respect to the hoop plate (5); the positioning plug-in includes a limiting frame (9), a sealing plate (10), a positioning plug (11), a positioning groove (12), and a rubber clamping block (13). The limiting frame (9) is in a "C"-shaped plate structure, the limiting frame (9) is fixed on the surface of the sliding plate (8), the sealing plate (10) is in a "hui"-shaped plate structure, the sealing plate (10) is fixed on the top surface of the limiting frame (9), one end of the positioning plug (11) is slidably connected between the two parallel side plates of the limiting frame (9), and the other end of the positioning plug (11) is movably inserted into the positioning groove (12). The positioning groove (12) is opened on the side wall of the reserved groove (2).

2. The integral prefabricated installation construction method for building pipelines according to claim 1, characterized in that: When modularly disassembling the pipe gallery, the large pipe gallery is disassembled into multiple individual hoisting modules, which are connected end to end. The pipe segments within a single hoisting module are individually processed and sized, and flange interfaces are reserved at the pipe ends for connection between modules. Each pipe segment within the module individually establishes a BIM family as the basis for back-end processing and prefabrication. The pipe segments are individually coded and affixed with two-dimensional code labels to display installation positioning information.

3. The integral prefabricated installation construction method for building pipelines according to claim 1, characterized in that: When establishing the BIM model of the support, SolidWorks is used for force analysis, the force calculation book of the support is reviewed, and the prefabricated support is finalized.

4. The integral prefabricated installation construction method for building pipelines according to claim 1, characterized in that: When using an electric hoist to tighten and hoist multiple crossarms, for single-layer pipe gallery modules, first install the bracket arm columns before hoisting, and then hoist the pipe row as a whole to the crossarm position. After completing the bolting of the crossarm and the bracket arm, lower the manual hoist to complete the unloading of the pipe row; when hoisting multi-layer pipe row modules, the modules need to be assembled as a whole on the ground, and the manual hoist needs to directly hang the formal bracket arm to complete the bolting sequence of the bracket arm and the steel plate with the embedded steel plate. First complete the alignment of the holes of the load-bearing bracket, and cooperate with the non-load-bearing lifting bracket to adjust the alignment position. After the alignment and bolting are completed simultaneously, the manual hoist is lowered to unload.

5. A method for integrally assembling and installing pipes in a building according to claim 1, Features: The rubber clamp (13) is fixed between one end of the positioning plug (11) and the limit frame (9), a force unloading groove is provided on the surface of the rubber clamp (13), a toggle handle (14) is fixed to the top surface of one end of the positioning plug (11), the toggle handle (14) is slidably connected in the groove body of the sealing plate (10), and a traction member is provided between the toggle handle (14) and the hoop plate (5).

6. A method for integrally assembling and installing pipes in a building according to claim 5, Features: The traction member comprises a bolting groove (15), a traction rope (16), a first through hole (17), a second through hole (18) and a traction handle (19); the bolting groove (15) is an annular groove, the bolting groove (15) is formed on the surface of the toggle handle (14), the first through hole (17) is formed on the surface of the hoop plate (5), and the second through hole (18) is formed on two parallel side walls of the first through hole (17); one end of the traction rope (16) is bolted to the bolting groove (15), and the other end of the traction rope (16) passes through the first through hole (17) and the second through hole (18) and is fixed to the surface of the traction handle (19).

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