A Building Electromechanical Installation Structure and Installation Method Based on BIM Technology

Abstract

This application discloses a building electromechanical installation structure and installation method based on BIM technology, relating to the field of building installation. It includes a building electromechanical installation structure based on BIM technology, comprising a pipe body with a liquid flow channel penetrating the pipe body. The pipe body has a sliding hole penetrating the pipe body to the liquid flow channel, and a sliding block sliding on the sliding hole, the sliding direction of the sliding block being the through direction of the sliding hole. The pipe body is provided with a protective cylinder, which is sleeved on the outer wall of the pipe body, and a clearance groove is provided on the inner wall of the protective cylinder. With the sliding block and clearance groove, in actual use, when the internal pressure of the liquid flow channel increases, the air pressure in the clearance groove does not change. Subsequently, the internal pressure of the liquid flow channel causes the sliding block to move towards the bottom of the clearance groove. Due to the increased volume, the internal pressure of the liquid flow channel decreases, reducing the possibility of pipe bursting due to excessive internal pressure, thus making the water supply from the water supply pipe more stable.

Description

Technical Field

[0001] This application relates to the field of building installation, and more specifically, it relates to a building electromechanical installation structure and installation method based on BIM technology. Background Technology

[0002] BIM, or Building Information Modeling, is a data-driven tool applied to engineering design, construction, and management. It integrates various project-related information through parametric models, enabling sharing and transmission throughout the entire project lifecycle, from planning and operation to maintenance. This significantly alters traditional models and methods in design, construction, and operation, making project information sharing, collaboration, communication, cost control, virtual scenario visualization, data delivery, energy efficiency, and energy consumption analysis more convenient and efficient. Consequently, it greatly improves the efficiency of manpower, materials, and equipment utilization, as well as socio-economic benefits.

[0003] Municipal water supply is the most basic guarantee for human survival in cities, and water resources need to be transported through municipal water supply pipelines to maintain the normal operation of cities. Therefore, the construction of municipal pipelines is an essential part of urban infrastructure, and water supply pipelines include drinking water, tap water, and miscellaneous water.

[0004] During the water supply process, there is a problem of water supply pipe bursts. One important reason for the bursts is the increased pressure inside the water supply pipe, which creates a high-pressure environment. When the pump suddenly stops or the pipe expands and contracts due to temperature changes, the water supply pipe may burst, which can affect the water supply and needs to be improved. Summary of the Invention

[0005] To address the issue of excessive internal pressure in water supply pipelines leading to pipe bursts, this application provides a building electromechanical installation structure and installation method based on BIM technology.

[0006] This application provides a building electromechanical installation structure and installation method based on BIM technology, which adopts the following technical solution:

[0007] A building electromechanical installation structure based on BIM technology includes a pipe body with a liquid flow channel extending through it. The pipe body also has a sliding hole extending through the liquid flow channel. A sliding block slides along the sliding hole, with the sliding direction of the sliding block being the direction of penetration of the sliding hole. A protective cylinder is provided on the outer wall of the pipe body, and a clearance groove is provided on the inner wall of the protective cylinder.

[0008] By using the above technical solution, a sliding block and a clearance groove are set up. In actual use, when the pressure inside the liquid flow channel increases, the air pressure inside the clearance groove does not change. Subsequently, the pressure inside the liquid flow channel will cause the sliding block to move towards the bottom of the clearance groove. Due to the increase in volume, the pressure inside the liquid flow channel decreases, reducing the possibility of pipe bursting caused by excessive pressure inside the liquid flow channel, and making the water supply of the water supply pipeline more stable.

[0009] Furthermore, the sliding hole sidewall is provided with a sliding groove, and the sliding block is provided with a sliding insert, the sliding insert being embedded in the sliding groove; when the sliding block slides along the through direction of the sliding hole, the sliding groove causes the sliding block to rotate.

[0010] By using the above technical solution, the sliding groove and sliding block are set up, which reduces the situation where the sliding block moves as soon as the pressure inside the liquid flow channel changes in actual use. Secondly, the friction force of the sliding block during sliding is increased, which reduces the situation where the gas pressure inside the clearance groove changes rapidly due to the rapid movement of the sliding block, and also reduces the situation where the sliding block hits the bottom of the clearance groove.

[0011] Furthermore, the sliding block is provided with a guide hole, which penetrates the sliding block. The penetration direction of the guide hole is consistent with the penetration direction of the sliding block. The guide block slides along the guide hole and is provided with a guide channel. One end of the guide channel is located on the side wall of the guide block near the liquid flow channel, and the other end is located on the side wall of the guide block away from the liquid flow channel. The bottom of the relief groove is provided with a protrusion, which is used to abut against the guide block. When the pressure in the liquid flow channel increases, the sliding block moves towards the bottom of the relief groove, and the sliding block drives the guide block to move. When the guide block presses against the protrusion, the sliding block continues to move towards the bottom of the relief groove, so that the guide channel connects the liquid flow channel and the relief groove.

[0012] Through the above technical solution, in actual use, due to various reasons such as temperature changes and sudden pump stoppage, there are situations where the pressure inside the pipe changes significantly. Therefore, a guide block and a guide channel are set up. When the pressure inside the liquid flow channel is too high, the movement of the sliding block first increases the volume inside the liquid flow channel and reduces the pressure. If the pressure inside the liquid flow channel is still high at this time, the movement of the sliding block causes the guide block to abut against the protrusion. The sliding block continues to move towards the bottom of the relief groove, so that the guide channel connects the liquid flow channel and the relief groove. Gas or liquid inside the liquid flow channel rushes into the relief groove, reducing the gas pressure inside the liquid flow channel. In this way, the possibility of pipe bursting due to excessive pressure inside the liquid flow channel is further reduced.

[0013] Furthermore, a reset spring is provided at the bottom of the relief groove. The end of the reset spring away from the bottom of the relief groove abuts against the sliding block, and the elastic force of the reset spring restricts the sliding block from moving towards the bottom of the relief groove.

[0014] The above technical solution includes a reset spring. The spring force of the reset spring makes it difficult for the sliding block to move upward quickly. Furthermore, the reset spring facilitates the reset of the sliding block after the pressure in the liquid flow channel decreases.

[0015] The pipe body has a drain hole on its side wall, which is located through the pipe body to the liquid flow channel. A drain block slidably moves through the drain hole, with the end of the drain block away from the liquid flow channel facing the bottom of the relief tank and abutting against the inner wall of the protective sleeve. A blocking hole is passed through the drain block, and the direction of the blocking hole is the same as the direction of the drain hole. A second drain block is provided on the inner wall of the protective sleeve, which passes through the blocking hole to the liquid flow channel. The second drain block has a drain channel, with one end located at the end of the second drain block close to the drain channel and the other end located on the side wall of the second drain block away from the drain channel.

[0016] Through the above technical solution, when the liquid or gas in the liquid flow channel enters the relief tank, the pressure in the area between the inner wall of the protective cylinder and the outer wall of the pipe increases. Subsequently, as the pressure in the liquid flow channel gradually decreases to normal pressure due to factors such as liquid transportation, the flow channel closes during this process, making the pressure in the area between the inner wall of the protective cylinder and the outer wall of the pipe greater than the pressure in the liquid flow channel, which is not convenient for subsequent pressure reduction. Therefore, drain block one and drain block two are set up to facilitate the return of liquid between the inner wall of the protective cylinder and the outer wall of the pipe to the liquid flow channel after the pressure in the liquid flow channel decreases, making the overall use more stable.

[0017] Furthermore, the inner wall of the protective sleeve is provided with a limiting groove, and the bottom of the limiting groove is provided with a limiting spring. The end of the limiting spring away from the bottom of the limiting groove is connected to the first drain block. The elastic force of the limiting spring restricts the first drain block from moving away from the bottom of the limiting groove.

[0018] Through the above technical solution, in actual use, after the drain block 1 moves to protrude from the side wall of the liquid flow channel, it is not easy to move back to its original position, which makes the sliding block 1 constantly subjected to the impact of the liquid, which can easily cause damage to the sliding block 1. Secondly, keeping the drain flow channel connected to the liquid flow channel and the relief groove reduces the regulating effect of the protective sleeve on the internal pressure of the liquid flow channel. Therefore, the limit spring is set to reduce the above situation.

[0019] A BIM-based building electromechanical installation method, wherein the piping adopts any of the above-mentioned BIM-based building electromechanical installation structures, further includes the following steps:

[0020] A: Conduct on-site surveys and draw 3D models of pipelines based on data. Use collision detection algorithms based on pipeline models to perform collision detection on the 3D pipeline models and make modifications until the collision result is zero.

[0021] B: After collision detection is completed, the 3D model of the pipeline is split and labeled;

[0022] C: Pre-processing: Pre-processing of the pipe body based on the 3D model of the split pipeline;

[0023] D: Acceptance and installation of semi-finished pipe products.

[0024] By applying BIM technology and using a collision detection algorithm based on pipeline models to perform collision checks in 3D pipeline modeling, the occurrence of pipeline collisions is reduced, engineering design is improved, and potential errors, losses, and rework issues during the construction phase are reduced.

[0025] Furthermore, the pipe installation should follow these requirements: install the inlet pipe first, then the main, vertical, and branch pipes; install underground pipes first, then above ground pipes; install large pipes first, then small pipes; install supports and hangers first, then pipe bodies; when pipe bodies are arranged against the wall, insulated pipes should be placed inside and non-insulated pipes outside; metal pipe bodies should be placed inside and non-metal pipe bodies outside; large pipes should be placed inside and small pipes outside; pipe bodies with fewer branches and less maintenance should be placed inside, and pipe bodies with more branches and more maintenance should be placed outside; and when pipe bodies are arranged side by side, a gap should be left for maintenance.

[0026] The above technical solutions facilitate pipeline installation, save installation costs, and also facilitate subsequent maintenance.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] (1) By using sliding blocks and clearance grooves, the situation of pipe bursting caused by excessive pressure inside the liquid flow channel is reduced, making the water supply of the water supply pipeline more stable.

[0029] (2) By setting up sliding grooves and sliding blocks, the situation where the sliding block moves as soon as the pressure inside the liquid flow channel changes during actual use is reduced. Secondly, the friction force when the sliding block slides is increased, which reduces the situation where the gas pressure in the relief groove changes rapidly due to the rapid movement of the sliding block, and also reduces the situation where the sliding block hits the bottom of the relief groove.

[0030] (3) By setting up drain block one and drain block two, the liquid between the inner wall of the protective cylinder and the outer wall of the pipe can flow back into the liquid channel after the pressure in the liquid channel decreases, making the overall use more stable. Attached Figure Description

[0031] Figure 1 This is an overall schematic diagram of an embodiment.

[0032] Figure 2 This is a cross-sectional schematic diagram of an embodiment.

[0033] Figure 3This is an enlarged schematic diagram of embodiment A.

[0034] Figure 4 This is an axial cross-sectional view of an embodiment.

[0035] Reference numerals in the attached drawings: 1. Pipe body; 2. Protective cylinder; 3. Liquid flow channel; 4. Sliding hole; 5. Sliding block; 6. Sliding groove; 7. Sliding insert; 8. Guide hole; 9. Guide block; 10. Limiting ring protrusion; 11. Limiting ring groove; 12. Relief groove; 13. Guide channel; 14. Protrusion; 15. Limiting spring; 16. Return spring; 17. Drain hole; 18. Drain block one; 19. Barrier hole; 20. Drain block two; 21. Drain flow channel; 22. Limiting groove. Detailed Implementation

[0036] The present application will be further described in detail below with reference to the accompanying drawings.

[0037] This application discloses a building electromechanical installation structure and installation method based on BIM technology.

[0038] Example:

[0039] See Figure 1 and Figure 2 A building electromechanical installation structure based on BIM technology includes a pipe body 1 and a protective cylinder 2. The pipe body 1 is provided with a liquid flow channel 3, which runs through the pipe body 1 and allows liquid to pass through.

[0040] join Figure 2 and Figure 3 The pipe body 1 is provided with a sliding hole 4, which is located on the upper side of the pipe body 1 and extends through the pipe body 1 to the liquid flow channel 3. The sliding hole 4 is provided with a sliding block 5, and a sliding groove 6 is provided on the side wall of the sliding hole 4. The sliding groove 6 is spirally shaped and extends spirally away from the liquid flow channel 3. The distance between the end of the sliding groove 6 closest to the liquid flow channel 3 and the axis of the liquid flow channel 3 is less than the distance between the inner wall of the liquid flow channel 3 and the axis of the liquid flow channel 3. The distance between the end of the sliding groove 6 closest to the bottom of the relief groove 12 and the bottom of the relief groove 12 is less than the distance between the end of the sliding hole 4 closest to the bottom of the relief groove 12. The sliding block 5 is provided with a sliding insert 7, which is embedded in the sliding groove 6. When the sliding block 5 slides along the through direction of the sliding hole 4, the sliding groove 6 causes the sliding block 5 to rotate.

[0041] The sliding groove 6 increases the friction of the sliding block 5, reducing the possibility of rapid movement of the sliding block 5, and also restricts the movement of the sliding block 5, reducing the possibility of the sliding block 5 sliding excessively and dislodging from the sliding hole 4. Furthermore, it limits the movement of the sliding block 5 towards the liquid flow channel 3, reducing the possibility of the end of the sliding block 5 near the axis of the liquid flow channel 3 protruding from the inner wall of the liquid flow channel 3. The protective cylinder 2 is sleeved on the outer wall of the pipe body 1, and the inner wall of the protective cylinder 2 is provided with a clearance groove 12, which is located on the inner wall of the protective cylinder 2 and near the top.

[0042] The sliding block 5 is provided with a guide hole 8, which passes through the sliding block 5. The direction of the guide hole 8 is the same as that of the sliding hole 4. The guide hole 8 is provided with a guide block 9 and a limiting ring protrusion 10. The guide block 9 slides in the guide hole 8 and is provided with a guide channel 13. One end of the guide channel 13 is located on the side wall of the guide block 9 near the liquid flow channel 3, and the other end is located on the side wall of the guide block 9 away from the liquid flow channel 3. The bottom of the relief groove 12 is provided with a protrusion 14, which corresponds to the guide block 9 and is used to abut against the guide block 9. When the pressure in the liquid flow channel 3 increases, the sliding block 5 moves towards the bottom of the relief groove 12, and the sliding block 5 drives the guide block 9 to move. When the guide block 9 abuts against the protrusion 14, the sliding block 5 continues to move towards the bottom of the relief groove 12, so that the guide channel 13 connects the liquid flow channel 3 and the relief groove 12. The guide block 9 is also provided with a limiting ring groove 11. The limiting ring groove 11 is located at one end of the guide block 9 near the protrusion 14. The limiting ring protrusion 10 is located on the inner wall of the guide hole 8 near the protrusion 14. The limiting ring groove 11 corresponds to the limiting ring protrusion 10. The limiting ring groove 11 allows the limiting ring protrusion 10 to be embedded. The limiting ring protrusion 10 is used to restrict the sliding of the guide block 9, so that the guide block 9 can only move relative to the sliding block 5 in a direction close to the axis of the liquid flow channel 3.

[0043] A return spring 16 is provided at the bottom of the relief groove 12. One end of the return spring 16 is connected to the bottom of the relief groove 12, and the other end is used to abut against the sliding block 5. The elastic force of the return spring 16 restricts the sliding block 5 from moving towards the bottom of the relief groove 12. In actual use, the protective sleeve can be fixed to the outer wall of the pipe body 1 with bolts, or alternatively, it can be fixed by welding.

[0044] See Figure 2 and Figure 4The pipe body 1 has a drain hole 17 on its side wall, located on the lower side of the relief groove 12. The drain hole 17 extends from the pipe body 1 to the liquid flow channel 3. A drain block 18 slides along the drain hole 17, with its end away from the liquid flow channel 3 facing the bottom of the relief groove 12 and abutting against the inner wall of the protective sleeve. This abutting against the inner wall of the protective sleeve restricts the drain block 18 from moving away from the axis of the liquid flow channel 3. A blocking hole 19 extends through the drain block 18, and the direction of the blocking hole 19 is the same as the direction of the drain hole 17. A second drain block 20 is located on the inner wall of the protective sleeve, passing through the blocking hole 19 to the liquid flow channel 3. The end of the second drain block 20 closest to the axis of the liquid flow channel 3 is flush with the inner wall of the liquid flow channel 3. The second drain block 20 is provided with a drain channel 21. One end of the drain channel 21 is located at the end of the second drain block 20 closest to the drain channel 21, and the other end is located on the side wall of the second drain block 20 away from the drain channel 21. When the pressure inside the liquid channel 3 is greater than the pressure in the area between the relief groove 12 and the outer wall of the pipe body 1, the first drain block 18 cannot move due to the contact of the inner wall of the protective cylinder 2. When the pressure inside the liquid channel 3 is less than the pressure in the area between the relief groove 12 and the outer wall of the pipe body 1, the first drain block 18 moves towards the axis of the liquid channel 3 until the drain channel 21 connects the liquid channel 3 and the relief groove 12, allowing the liquid in the relief groove 12 to flow out. In actual use, there are two drain holes 17, and the line connecting the two drain holes 17 is perpendicular to the axis of the liquid channel 3. During actual installation, the sliding block 5 is located at the top, so when in use, the liquid in the relief groove 12 gathers around the drain hole 17 due to the influence of gravity, resulting in better drainage.

[0045] The inner wall of the protective sleeve is provided with a limiting groove 22, and a limiting spring 15 is provided at the bottom of the limiting groove 22. The end of the limiting spring 15 away from the bottom of the limiting groove 22 is connected to the drain block 18. The elastic force of the limiting spring 15 restricts the drain block 18 from moving away from the bottom of the limiting groove 22. The limiting spring 15 is used to assist the movement of the drain block 18, so that the drain block 18 can move back to its original position.

[0046] A BIM-based building electromechanical installation method, wherein the piping adopts the aforementioned BIM-based building electromechanical installation structure, further includes the following steps:

[0047] A: Conduct on-site surveys and draw 3D models of pipelines based on data. Use collision detection algorithms based on pipeline models to perform collision detection on the 3D pipeline models and make modifications until the collision result is zero.

[0048] B: After collision detection is completed, the 3D model of the pipeline is split and labeled;

[0049] C: Pre-processing: Pre-processing of pipe body 1 based on the 3D model of the split pipeline;

[0050] D: Acceptance and installation of semi-finished pipe body 1. During installation, the following requirements shall be followed: install the inlet pipe first, then install the main, vertical and branch pipes, underground first then above ground, large pipe first then small pipe, support and hanger first then pipe body 1. When pipe body 1 is arranged against the wall, the insulated pipe is placed inside and the non-insulated pipe is placed outside. The metal pipe body 1 is placed inside and the non-metal pipe body 1 is placed outside. The large pipe is placed inside and the small pipe is placed outside. The pipe body 1 with fewer branches and less maintenance is placed inside, and the pipe body 1 with more branches and more maintenance is placed outside. When pipe body 1 is set up side by side, a gap for maintenance shall be left.

[0051] The working principle of this embodiment is as follows:

[0052] In actual use, when the pressure inside the liquid flow channel 3 increases and exceeds the pressure in the area between the relief groove 12 and the outer wall of the pipe body 1, the sliding block 5 moves towards the bottom of the relief groove 12. The sliding block 5 drives the guide block 9 to move. When the guide block 9 presses against the protrusion 14, the sliding block 5 continues to move towards the bottom of the relief groove 12, so that the guide channel 13 connects the liquid flow channel 3 and the relief groove 12. At this time, the liquid and gas in the liquid flow channel 3 flow into the space where the relief groove 12 is located. When the pressure inside the liquid flow channel 3 is close to the pressure in the area between the relief groove 12 and the outer wall of the pipe body 1, the return spring 16 causes the sliding block 5 to slide and closes the guide channel 13.

[0053] When the pressure inside the liquid flow channel 3 decreases and the pressure in the area between the relief groove 12 and the outer wall of the pipe body 1 is greater than the pressure in the liquid flow channel 3, the drain block 18 moves toward the axis of the liquid flow channel 3, so that the drain channel 21 connects the liquid flow channel 3 and the relief groove 12. At this time, the liquid that accumulates below the relief groove due to gravity enters the liquid flow channel 3 from the drain channel 21.

[0054] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A building electromechanical installation method based on BIM technology, characterized in that: The piping adopts a BIM-based building electromechanical installation structure, and also includes the following steps: A: Conduct on-site surveys and draw 3D models of pipelines based on data. Use collision detection algorithms based on pipeline models to perform collision detection on the 3D pipeline models and make modifications until the collision result is zero. B: After collision detection is completed, the 3D model of the pipeline is split and labeled; C: Pre-processing: Pre-processing of the pipe body (1) based on the three-dimensional model of the split pipeline; D: Pipe body (1) semi-finished product acceptance and installation; A building electromechanical installation structure based on BIM technology includes a pipe body (1), the pipe body (1) having a liquid flow channel (3) through the pipe body (1), the pipe body (1) having a sliding hole (4) through the pipe body (1) to the liquid flow channel (3), a sliding block (5) sliding in the sliding hole (4), the sliding direction of the sliding block (5) being the through direction of the sliding hole (4); the pipe body (1) having a protective cylinder (2), the protective cylinder (2) being fitted onto the outer wall of the pipe body (1), and the inner wall of the protective cylinder (2) having a clearance groove (12); The sliding hole (4) has a sliding groove (6) on its side wall, and the sliding block (5) has a sliding insert (7) which is embedded in the sliding groove (6). When the sliding block (5) slides along the through direction of the sliding hole (4), the sliding groove (6) causes the sliding block (5) to rotate; The sliding block (5) is provided with a guide hole (8), which passes through the sliding block (5). The direction of the guide hole (8) is the same as the direction of the sliding hole (4). A guide block (9) slides through the guide hole (8). The guide block (9) is provided with a guide channel (13). One end of the guide channel (13) is located on the side wall of the guide block (9) near the liquid flow channel (3), and the other end is located on the side wall of the guide block (9) away from the liquid flow channel (3). The bottom of the relief groove (12) is provided with a protrusion (14), which is used to abut against the guide block (9). When the pressure inside the liquid flow channel (3) increases, the sliding block (5) moves toward the bottom of the relief groove (12), and the sliding block (5) drives the guide block (9) to move; when the guide block (9) presses against the protrusion (14), the sliding block (5) continues to move toward the bottom of the relief groove (12), so that the guide channel (13) connects the liquid flow channel (3) and the relief groove (12).

2. The building electromechanical installation method based on BIM technology according to claim 1, characterized in that: The bottom of the relief groove (12) is provided with a reset spring (16). The end of the reset spring (16) away from the bottom of the relief groove (12) abuts against the sliding block (5). The elastic force of the reset spring (16) restricts the sliding block (5) from moving towards the bottom of the relief groove (12).

3. A building electromechanical installation method based on BIM technology according to claim 2, characterized in that: The side wall of the pipe body (1) is provided with a drain hole (17). The drain hole (17) is located through the pipe body (1) to the liquid flow channel (3). A drain block (18) slides on the drain hole (17). The end of the drain block (18) away from the liquid flow channel (3) faces the bottom of the relief groove (12) and abuts against the inner wall of the protective sleeve. A blocking hole (19) is passed through the drain block (18). The blocking hole (19) passes through the drain block (18). The direction of the blocking hole (19) is the same as the direction of the drain hole (17). The inner wall of the protective sleeve is provided with a second drain block (20), which passes through the barrier hole (19) to the liquid flow channel (3). The second drain block (20) is provided with a drain flow channel (21). One end of the drain flow channel (21) is located at the end of the second drain block (20) close to the drain flow channel (21), and the other end is located on the side wall of the second drain block (20) away from the drain flow channel (21).

4. A building electromechanical installation method based on BIM technology according to claim 3, characterized in that: The inner wall of the protective sleeve is provided with a limiting groove (22), and a limiting spring (15) is provided at the bottom of the limiting groove (22). The end of the limiting spring (15) away from the bottom of the limiting groove (22) is connected to a drain block (18). The elastic force of the limiting spring (15) restricts the drain block (18) from moving away from the bottom of the limiting groove (22).

5. A building electromechanical installation method based on BIM technology according to claim 1, characterized in that: The installation of pipe body (1) shall follow the following requirements: first install the inlet pipe, then install the main, vertical and branch pipes, underground first then above ground, large pipe first then small pipe, support and hanger first then pipe body (1), when pipe body (1) is arranged against the wall, the insulated pipe is in the inside and the non-insulated pipe is in the outside, the metal pipe body (1) is in the inside and the non-metal pipe body (1) is in the outside, the large pipe is in the inside and the small pipe is in the outside, the pipe body (1) with few branches and few maintenance is in the inside, and the pipe body (1) with many branches and many maintenance is in the outside, and when pipe body (1) is set up side by side, a gap for maintenance shall be left.

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