Air pipe guide body, air pipe device

Abstract

To provide an air pipe guide body and an air pipe device that prevent reduction of a cross-section area due to bending of a soft pipe installed in a curved manner so as to be able to use the soft pipe without rings, not a hard pipe, even for an air pipe at a branch passage or the like.SOLUTION: An air pipe guide body 2 is applied to a bend part of a soft air pipe 1 placed in a subsurface passage, and forms a bent-pipe shape by annular ring materials 10 lined with a space in an axial direction and accouplements 20 locally connecting the ring materials 10 to each other. An inner diameter of the ring material 10 is larger than an outer diameter of the air pipe 1. One end α and the other end β of the bent-pipe shape are open. An inside of the bent-pipe shape becomes a space through which the air pipe 1 passes.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an air duct guide body and an air duct device that are applied to a curved portion of an air duct that is temporarily installed in tunnel construction, mining work, etc. [Background technology]

[0002] At tunnel construction sites, mining sites, etc., soft and flexible air ducts consisting of multiple connected cylindrical air duct bodies are sometimes installed for the purpose of ventilation by supplying or exhausting air, as described in Patent Document 1, for example. Furthermore, when the tunnel has a T-junction or a Y-junction, the air duct may be branched and arranged as in Patent Document 2, for example. Furthermore, Patent Document 3 discloses that the switching damper and the scavenging fan are connected by a steel pipe (third auxiliary pipe) that is a 90° bent pipe. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-264034 [Patent Document 2] Japanese Patent Application Publication No. 2014-202046 [Patent Document 3] Japanese Patent Application Laid-Open No. 2006-348696 Summary of the Invention [Problem to be solved by the invention]

[0004] Temporary air ducts installed for ventilation purposes during construction of underground passages such as tunnels can sometimes extend over several hundred meters. Types of air ducts include soft pipes such as ring-type soft pipes, in which rings of hard steel wire are arranged at regular intervals inside a flame-retardant fabric, spiral-type soft pipes, in which steel wire is wound spirally on the surface of a flame-retardant fabric, and soft pipes without rings that do not have a supporting material such as hard steel wire, while hard pipes include spiral steel pipes. Of the above, soft pipes without rings have the advantages of being lightweight, inexpensive, and compatible with large diameters, but when installed in a curved position, the cross-sectional area (diameter) of the curved part becomes smaller due to bending, which may hinder the smooth flow of air and other fluids inside. For this reason, soft pipes without rings are sometimes used for the straight sections that make up the majority of the total length of the air duct, and spiral steel pipes are used only for sections where the air duct bends, such as branching paths, and soft pipes and hard pipes are used together. However, the spiral steel pipes used in such cases almost always weigh more than 100 kg, so a large crane is required to suspend them from the ceiling inside the tunnel, making installation, relocation, and removal work very complex, and they are extremely dangerous if they fall. Therefore, the present invention aims to provide an air duct guide body and an air duct device that prevent a reduction in cross-sectional area due to bending of a curved, soft pipe without a ring, so that a soft pipe without a ring can be used instead of a hard pipe for an air duct in a branch passage, etc. [Means for solving the problem]

[0005] The air duct guide body 2 of the present invention described in claim 1 is applied to the curved portion of a soft air duct 1 arranged in an underground passage, and is formed into a curved pipe shape by annular ring materials 10 arranged at intervals in the axial direction and connecting materials 20 that locally connect the ring materials 10 to each other, the inner diameter of the ring materials 10 is larger than the outer diameter of the air duct 1, one end α and the other end β of the curved pipe are open, and the inside of the curved pipe is a space through which the air duct 1 passes. The present invention described in claim 2 is characterized in that, in the air duct guide body 2 described in claim 1, the connecting materials 20 are provided at a total of four locations at 90 degree intervals around the circumferential direction, or at a total of three locations at 120 degree intervals. The present invention as set forth in claim 3 is characterized in that in the air duct guide body 2 as set forth in claim 1, the inner diameter of the ring member 10 is larger than the outer diameter of the air duct 1 by 5 mm to 50 mm. The present invention as set forth in claim 4 is characterized in that, in the air duct guide body 2 as set forth in claim 1, it is formed by connecting a plurality of cylindrical divided bodies in which ring members 10 are locally connected to each other by connecting members 20. The present invention described in claim 5 is characterized in that, in the air duct guide body 2 described in claim 4, the connected segments include one or more straight pipe segments 2a whose axis is straight and one or more curved pipe segments 2b whose axis is curved. The air duct device of the present invention as set forth in claim 6 is characterized by including the air duct guide body 2 as set forth in any one of claims 1 to 5, and a soft air duct 1 passed through the air duct guide body 2. [Effects of the Invention]

[0006] By using the air duct guide body or air duct device of the present invention, it is possible to prevent a reduction in cross-sectional area due to bending of a soft pipe without a ring, so that a soft pipe without a ring can be used instead of a hard pipe for air ducts in branch passages, etc. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is a diagram showing an air duct guide according to an embodiment of the present invention; [Figure 2] A photograph showing the air duct passing through the air duct guide body DETAILED DESCRIPTION OF THE INVENTION

[0008] The air duct guide body according to the first embodiment of the present invention is an air duct guide body to be applied to the bend of a soft air duct arranged in an underground passage, and is formed into a curved pipe shape by annular ring materials arranged at intervals in the axial direction and connecting materials that locally connect the ring materials to each other, the inner diameter of the ring materials is larger than the outer diameter of the air duct, one end and the other end of the curved pipe are open, and the inside of the curved pipe is a space through which the air duct passes. According to this embodiment, the bent portion of the air duct, which is a soft pipe, is passed through the inside of the air duct guide body, and when the air duct becomes a circular pipe during air flow, it is supported from the outside over almost the entire circumference by the air duct guide body, so that bending does not occur and a smooth air flow can be maintained. In addition, the air duct guide body is made of a ring material and a connecting material, so it is lighter than a hard pipe, and there is no need to connect the hard pipe and the soft pipe, which makes installation and relocation easier.

[0009] In the second embodiment of the present invention, in the air duct guide body of the first embodiment, the connecting members are provided at four locations circumferentially at 90-degree intervals, or at three locations circumferentially at 120-degree intervals. According to this embodiment, it is possible to achieve a good balance between maintaining the shape of the ring member and reducing the weight of the air duct guide body.

[0010] A third embodiment of the present invention is an air duct guide body according to the first embodiment, wherein the inner diameter of the ring member is 5 mm to 50 mm larger than the outer diameter of the air duct. According to this embodiment, by making the inner diameter of the ring material 5 mm or more larger than the outer diameter of the air duct, even if the air duct is soft and stretches a little, the part that is housed inside the air duct guide body can expand to the same size as the part that is not housed when air is blown, so that a difference in level is unlikely to occur between the part of the air duct where the air duct guide body is provided and the parts before and after it, thereby making the air flow smoother. Also, by making the inner diameter of the ring material no larger than the outer diameter of the air duct + 50 mm, the air duct that becomes a circular tube when air is blown is more likely to come into contact with the ring material all around, making it possible to more reliably prevent bending and make the air flow smoother.

[0011] The fourth embodiment of the present invention is an air duct guide body according to the first embodiment, which is made up of a plurality of cylindrical divided bodies connected together by connecting members, each of which has ring members locally connected to each other. According to this embodiment, the air duct guide body is made up of a plurality of divided bodies, so that the length and shape of the air duct guide body can be adjusted by combining the divided bodies. Also, manufacturing is easier than manufacturing it as a single unit from the beginning, and it can be stored and transported as a divided body unit.

[0012] The fifth embodiment of the present invention is an air duct guide body according to the fourth embodiment, in which the connected segments include one or more straight pipe segments whose axes are straight and one or more curved pipe segments whose axes are curved. According to this embodiment, the air duct can be passed through the air duct guide body not only through the bent portion but also through a portion of the straight portion before or after the bent portion, thereby preventing bending of the air duct at the bent portion and its surrounding area.

[0013] An air duct device according to a sixth embodiment of the present invention is characterized by comprising any one of the first to fifth air duct guide bodies and a soft air duct that passes through the air duct guide body. According to this embodiment, at least the bent portion of the flexible air duct passes through the inside of the air duct guide body, and when the air duct becomes a circular tube during air flow, it is supported from the outside over almost the entire circumference by the air duct guide body, so that no bending occurs and a smooth air flow can be maintained. [Example]

[0014] Hereinafter, an air duct guide and an air duct device according to an embodiment of the present invention will be described. Fig. 1 shows the air duct guide body according to this embodiment, with Fig. 1(a) being a rear view, Fig. 1(b) being a top view, and Fig. 1(c) being a front view. Fig. 2 is a photograph showing the state in which the air duct is passed through the air duct guide body. The air duct device comprises a soft air duct 1 and a hard air duct guide body 2. The photograph in Figure 2 was taken outdoors to simulate an actual usage situation (a state in which the air duct 1 and air duct guide body 2 are suspended from a suspension wire 3 in an underground passage). The air duct 1 is used for ventilation at construction sites such as excavation sites for underground passages such as tunnels, and is temporarily installed, for example, from the tunnel entrance to the tunnel face, by being suspended from a suspension wire 3 suspended from the ceiling. The air duct 1 is made up of multiple air duct bodies connected with connectors such as fasteners. Each air duct body is made of a soft, flexible fabric such as tarpaulin, and is, for example, 10 m long. A blower is connected to one end of the air duct 1, and when air is not being blown from the blower, the air duct is in a collapsed state, but when air is being blown, the pressure of the air flowing inside causes the air duct 1 to assume a cylindrical shape. The air duct guide body 2 is applied to a portion (bending portion) where the air duct 1 has a curved shape, such as a branching portion of the installation path of the air duct 1. The air duct 1 is installed by passing through the inside of the air duct guide body 2 in the portion of the installation path where the air duct guide body 2 is installed.

[0015] The air duct guide body 2 is formed into a curved pipe shape mainly composed of annular ring members 10 arranged at intervals in the axial direction and connecting members 20 that locally connect the ring members 10. Note that the curved pipe shape includes not only a shape that is curved entirely but also a shape that is curved only partially. This air duct guide body 2 is constructed like a frame, with the spaces between the ring members 10 being uncovered by surface materials, etc. This allows for a significant weight reduction, making it approximately one-quarter the weight of a spiral steel pipe of the same length. The ring members 10 are circular, and a plurality of them are provided at one end α and the other end β of the air duct guide body 2 and between them. Each ring member 10 has the same diameter, and the inner diameter is larger than the outer diameter of the air duct 1. One end α and the other end β of the curved duct guide body 2 are open, and the inside of the air duct guide body 2 is a space through which the air duct 1 passes. If the bent portion of the air duct 1 is left as it is, it may bend when air is blown, reducing its cross-sectional area and preventing smooth air flow. However, in this embodiment, the bent portion of the air duct 1 is contained inside the air duct guide body 2, and when it becomes a circular duct when air is blown, it is supported from the outside all around by the air duct guide body 2, so that the air duct 1 does not bend. Therefore, smooth air flow can be maintained even at the bent portion of the air duct 1. Furthermore, as described above, the air duct guide body 2 is lightweight, so that it can be hung from the ceiling without using a large crane. Furthermore, when installing a spiral steel pipe in a location where the air duct 1 has a curved shape as in the past, it is necessary to connect the air duct 1 to both ends of the spiral steel pipe, but in this embodiment, the air duct 1 can be simply passed through the inside of the air duct guide body 2, eliminating the need for such connecting work, and the workload during installation, relocation, removal, etc. can be significantly reduced compared to when a spiral steel pipe is used. Furthermore, since the air duct guide body 2 is located outside the air duct 1 and does not come into contact with the fluid inside the air duct 1, corrosion due to moisture contained in the fluid is prevented.

[0016] The inner diameter of the ring material 10 is set to be approximately 5 mm to 50 mm larger than the outer diameter of the air duct 1. By setting the inner diameter of the ring material 10 to be approximately 5 mm larger than the outer diameter of the air duct 1, even if the air duct 1 is soft and therefore slightly stretches, the portion of the air duct 1 housed inside the air duct guide body 2 can expand to the same size as the other portions during air blowing. This prevents the formation of a step between the portion of the air duct 1 where the air duct guide body 2 is provided and the portions before and after it, thereby ensuring smooth airflow. Furthermore, by setting the inner diameter of the ring material 10 to be approximately 50 mm larger than the outer diameter of the air duct 1, the air duct 1, which becomes a circular tube during air blowing, is more likely to come into contact with the ring material 10 over its entire circumference, which more reliably prevents bending and ensures smooth airflow.

[0017] The connecting members 20 are rod-shaped and are provided outside the ring members 10 along the axial direction from one end α to the other end β of the air duct guide body 2. The connecting members 20 are connected to each ring member 10 by welding or the like. By connecting each ring member 10 with the connecting members 20, deformation due to bending of the ring members 10 can be suppressed when the air duct guide body 2 is hung from the ceiling, and the approximately perfect circular shape can be maintained. Generally, the ring materials 10 are connected to the connecting materials 20 at a factory and transported to a construction site or the like in an integrated state, but the ring materials 10 and the connecting materials 20 can also be transported separately and then integrated near the construction site or the like. When the ring materials 10 are transported without the connecting materials 20 being connected, it becomes easier to load and unload them onto a transport vehicle, and it also becomes easier to transport them together with other materials, improving transportation efficiency. Although two or five or more connecting members 20 can be provided in the circumferential direction, it is preferable to provide a total of three connecting members 20 at 120-degree intervals in the circumferential direction, or a total of four connecting members 20 at 90-degree intervals in the circumferential direction. By providing three or four connecting members 20 at predetermined intervals in the circumferential direction, it is possible to achieve a good balance between maintaining the shape of the ring member 10 and reducing the weight of the air duct guide body 2. In this embodiment, there are four connecting members 20.

[0018] The air duct guide body 2 is formed by flange-connecting cylindrical divided bodies in which ring members 10 are locally connected to each other by connecting members 20. The air duct guide body 2 can be manufactured as a single unit from the beginning, but a configuration in which multiple divided bodies are manufactured and then assembled offers the advantages of easier manufacturing, allowing each divided body to be stored and transported separately, and enabling the length and shape of the air duct guide body 2 to be adjusted by changing the number and order of combinations of the divided bodies. In this embodiment, the air duct guide body 2 is made up of four segments. Three of these are straight pipe segments 2a with straight axes, and the other is a curved pipe segment 2b with a curved axis. The straight pipe segments 2a are of different lengths. By configuring the air duct guide body 2 to include one or more straight pipe segments 2a and one or more curved pipe segments 2b, not only the curved portion of the air duct 1 but also the straight portion (straight portion) before or after the curved portion passes through the air duct guide body 2, which prevents bending of the air duct 1 at the boundary between the curved portion and the straight portion.

[0019] The connecting member 20, which is located at the top when suspended from the ceiling, is provided with a mounting fixture 30 such as an eyebolt for attaching to a suspension wire 3 suspended from the ceiling surface of the tunnel. In the straight pipe segment 2a, the mounting fixture 30 is provided at a position on the connecting member 20 that does not overlap with the ring member 10, and in the curved pipe segment 2b, it is provided at a position on the connecting member 20 that overlaps with the ring member 10. In addition, in the connecting member 20 of the straight pipe segment 2a, the location where the mounting fixture 30 is provided is reinforced by connecting a semicircular ring member 40. Both ends of the semicircular ring member 40 are fixed to the connecting members 20 that are located on the left and right when the pipe is hung from the ceiling. The air duct guide body 2 can be suspended from the ceiling surface of the tunnel and removed by engaging and disengaging the mounting fixture 30 with the suspension wire 3. [Explanation of symbols]

[0020] 1 windpipe 2 Air duct guide body 2a Straight pipe segment 2b Bent tube segment α One end of the air duct guide body β Other end of the air duct guide body 10 Ring material 20 Connecting material

Claims

1. An air duct guide body to be applied to a bent portion of a soft air duct arranged in an underground passage, The bent pipe is formed by annular ring members arranged at intervals in the axial direction and connecting members that locally connect the ring members to each other, The inner diameter of the ring member is larger than the outer diameter of the air duct, The air duct guide body is characterized in that one end and the other end of the curved pipe are open, and the inside of the curved pipe forms a space through which the air duct passes.

2. 2. The air duct guide body according to claim 1, wherein the connecting members are provided at four locations at 90-degree intervals in the circumferential direction, or at three locations at 120-degree intervals in the circumferential direction.

3. 2. The air duct guide body according to claim 1, wherein the inner diameter of the ring member is 5 mm to 50 mm larger than the outer diameter of the air duct.

4. 2. The air duct guide body according to claim 1, wherein the air duct guide body is formed by connecting a plurality of cylindrical divided bodies in which the ring members are locally connected to each other by the connecting members.

5. The air duct guide body according to claim 4, characterized in that the connected segments include at least one straight pipe segment having a straight axis and at least one curved pipe segment having a curved axis.

6. The air duct guide body according to any one of claims 1 to 5, a flexible air duct that passes through the air duct guide body.

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