JP5786053B2 - Telescopic duct - Google Patents

Description

  The present invention relates to an extendable duct that can be used for ventilation equipment installed in a tunnel under construction.

  Ventilation equipment used for the tunnel under construction is equipment that ventilates the tunnel and sucks dust from the excavation site. Since tunnel tunnels extend as needed according to the progress of work, it is preferable that the ventilation equipment has an extendable structure, and various structures have been proposed.

For example, in the invention described in Patent Document 1, a twist prevention unit (a slide bar (52) inscribed in the shape retaining ring (42)) and a connecting ring (54) for bending the slide bar (52) in a circumferential shape ( 50) is provided in the suction duct (24).
According to the technique, the slide bar (52) inscribed in the shape retaining ring (42) restrains the movement of the shape retaining ring (42), thereby preventing the suction duct (24) from being twisted. , And.

JP 2004-116793 A

However, in the invention described in Patent Document 1, it has been found that at least one of the following problems still occurs.
(1) Viewpoint of restraint function Since the slide bar is a bar and stays in a linear restraint force, if a large negative pressure is generated, the slide bar cannot sufficiently restrain the movement of the deformation holding ring, and the suction duct is twisted. There is a risk that it cannot be suppressed.
(2) Viewpoint of expansion / contraction function Since the slide bar is in contact with the deformation retaining ring (in contact with the inside), the flexible bar constituting the duct interferes with the slide bar when the duct contracts. Resulting in. If it does so, a duct may not fully shrink | contract or a duct may be damaged, and there exists a possibility that an expansion-contraction operation | movement may not be performed smoothly.
(3) Viewpoint of common use of members Since the slide bar is provided so as to communicate in the front-rear direction of the connection ring, the slide bar may interfere between adjacent connection rings when the duct contracts.
In order to prevent this interference, a method of shifting the position where the slide bar is provided between adjacent coupling rings can be considered, but this not only prevents the common structure as a torsion prevention unit but also considers the order of coupling. Result in poor versatility.

  Therefore, an object of the present invention is to provide an expandable duct capable of satisfying both the expansion and contraction function of the duct and the reliability of the function of maintaining the cross section.

  The present invention, which has been made to solve the above problems, is arranged between a flexible wind tube, a plurality of support rings arranged at intervals in the axial direction of the wind tube, and the support ring, A ring frame that holds at least the shape of the wind tube, and is an extendable duct that allows the wind tube to expand and contract by moving the support ring back and forth, and is directed from the support ring toward the axial direction of the wind tube. There is provided a telescopic duct characterized by further comprising a plurality of deformation resistance portions that are provided so as to extend and have a mountain shape.

Further, according to a second invention of the present application, in the invention, the deformation resistance portion on the other end side of the support ring is shifted in the circumferential direction of the support ring with respect to the deformation resistance portion provided on the one end side of the support ring. It is characterized by being provided.
Further, according to a third invention of the present application, in the above invention, each deformation resistance provided in the other end side of the support ring adjacent to the support ring is a space between each deformation resistance portion provided on one end side of the support ring. It is characterized by having a storage part.
In the fourth invention of the present application, the deformation resistance portion is provided at a position offset inward from the inner diameter of the wind tube, and the offset length is determined when the wind tube contracts. It is more than the length of the part which bends and protrudes inside.

According to the present invention, at least one of the effects described below can be obtained.
(1) Viewpoint of restraint function Since the deformation resistance portion has a mountain shape and has a restraint force on the ring frame, even if a large negative pressure is generated, the movement of the ring frame is sufficiently restrained. And the displacement of the ring frame can be reliably suppressed.
(2) Viewpoint of expansion and contraction function By offsetting the deformation resistance portion in the direction of the inside of the wind tube in advance, the projecting (protruding) portion of the wind tube when the ventilation duct contracts can be stored in the offset portion. Therefore, the deformation resistance portion does not hinder the expansion / contraction operation of the ventilation duct.
(3) Viewpoint of common use of members The deformation resistance portion provided on one end side of the support ring and the deformation resistance portion provided on the other end side of the support ring are arranged adjacent to each other by being shifted in the circumferential direction of the support ring. While avoiding the problem that the deformation resistance portions provided in the matching support rings interfere with each other, the members can be shared at the same time.

Schematic which shows the ventilation duct (expanded state) which concerns on this invention. Schematic which shows the structure of a deformation resistance part. Schematic which shows the state which shortened the ventilation duct. Schematic which shows the state which the negative pressure generate | occur | produced in the contracted ventilation duct.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

An embodiment of a ventilation duct according to the present invention will be described.
<1> Overall Configuration Refer to FIG. A ventilation duct according to the present invention includes a wind pipe 1, a plurality of support rings 2 arranged at intervals in the axial direction of the wind pipe 1, a ring frame 3 arranged between the support rings 2, and the support A plurality of deformation resistance portions 4 provided so as to extend from the ring 2 in the axial direction of the wind tube 1 are provided.
Details of each component will be described below.

<2> Wind pipe The wind pipe 1 is a member for forming a ventilation path.
The wind tube 1 is a member having a cylindrical shape using a flexible material such as vinyl.
The structure of the wind pipe 1 should just exhibit a well-known structure, and detailed description is abbreviate | omitted.

<3> Support ring The support ring 2 is a member for allowing expansion and contraction in a state where the wind tube 1 is supported.
A plurality of support rings 2 are arranged at predetermined intervals at the front end, rear end, and other intermediate portions of the duct.
A suspension ring 21 is provided on the top of the support ring 2 to be connected to a rail traveling body (not shown) arranged at the site of use. By connecting the end of the wind tube 1 to the end of the support ring 2, the wind tube 1 can be supported.
Then, by moving the plurality of support rings 2 toward and away from each other in the axial direction of the wind tube 1, the flexible wind tube 1 can be expanded and contracted.

<4> Ring Frame The ring frame 3 is a member for maintaining the cross-sectional shape of the wind tube 1.
The ring frame 3 is appropriately disposed inside or outside the wind tube 1 with a predetermined interval in the axial direction of the wind tube 1.
The ring frame 3 not only maintains the cross-sectional shape of the wind tube 1 but also functions as a bellows-shaped frame portion so that the wind tube 1 can easily expand and contract.

  A suspension ring for connecting to a rail traveling body (not shown) can be provided on the top of the ring frame in the same manner as the support ring.

<5> Deformation Resistance Portion The deformation resistance portion 4 is a member for preventing the ring frame 3 from being displaced.
This “displacement” refers to rotation (so-called “pitch”) about the horizontal direction of the wind tube 1 when the axial direction of the wind tube 1 is the front-rear direction, and the vertical direction of the wind tube 1 as the axis. Rotation (so-called “yaw”), or a combination thereof.
The deformation resistance portion 4 is disposed so as to extend from the support ring 2 in the wind tube axis direction.
Details of the deformation resistance unit 4 will be described with reference to FIGS.

(1) Shape (Figure 2)
The shape of the deformation resistance unit 4 will be described.
The deformation resistance portion 4 has a substantially triangular shape (mountain shape) with the support ring 2 side as a base.
The substantially triangular sides can be formed by appropriately bending the pipe material.
In the present invention, it is possible to configure a plate-like member having a substantially triangular plate material as the deformation resistance portion 4. However, in view of securing an effective diameter of the wind tube 1 described later, the member is generally omitted as in this example. It is desirable that each triangular side is made of a pipe material and the inside of the shape is hollow. It is also preferable from the viewpoint of making the entire duct as light as possible.

(2) Processing of the tip portion (FIG. 2)
The distal end portion 41 of the deformation resistance portion 4 is subjected to a bending process so as not to have an acute angle.
The tip portion 41 may be gradually inclined inward from the support ring 2 side, or may be bent inward from a certain portion.
The bending process and the bending process are for preventing breakage of the wind pipe due to contact between the tip portion 41 and the wind pipe.

(3) Number of arrangement (Fig. 2)
In this embodiment, the deformation resistance portions 4 are arranged at three locations at equal intervals in the circumferential direction of the support ring 2. That is, the center lines of the deformation resistance portions 4 are spaced from each other by 120 °.
Further, the occupation angle of the bottom portion of the deformation resistance portion 4 is secured at about 60 °.
Therefore, the separation angle between the deformation resistance portions 4 between the same support rings 2 is also about 60 °.

(4) Arrangement in the front-rear direction (Fig. 2)
The deformation resistance portion 4 is arranged so as to be shifted in the circumferential direction of the support ring 2 on the front side and the rear side of the support ring 2.
In this embodiment, the deformation resistor 4 on the rear side is shifted in phase by 60 ° with respect to the deformation resistor 4 provided on the front side.
Due to this phase shift, a portion in which the separation angle between the deformation resistance portions 4 between the same support rings 2 is secured is a region in which the deformation resistance portions 4 extending from the support rings 2 adjacent in the wind tube axis direction are accommodated ( It becomes storage part 6).

(5) Securing offset (Figs. 2 and 3)
The deformation resistance portion 4 is provided so as to extend from the support ring 2 in the wind tube axis direction, and the arrangement mode is configured to be located inside the inner diameter of the wind tube 1.
For example, it is desirable that the deformation resistance portion 4 is disposed at a position offset inward from the inner diameter of the wind tube 1 by a length longer than the projecting length of the wind tube between the ring frames 3 when the wind tube 1 is contracted most. .
That is, when there is one fold between the adjacent ring frames 3, the folding width of the wind tube 1 is the distance between the ring frames 3 when the wind tube 1 is fully extended (hereinafter, bellows width b). If the number of folds is two, it corresponds to about ３ of the expansion / contraction length.
Assuming that this folding width is the length of projection of the wind tube 1 when the wind tube 1 is contracted to the maximum, an offset length h is set. A portion where the wind tube 1 is folded and protrudes is accommodated in the offset portion 5 without interfering with the ring frame 3.

Normally, the manner in which the folded portion of the wind tube 1 protrudes inside the wind tube 1 is a case where the wind tube 1 is positioned above the deformation resistance portion 4. In the case where the wind tube 1 is folded downward on the lower side, there may be a case where the offset need not be considered.
However, when the folded portion of the wind tube 1 is always formed so as to protrude toward the inside of the wind tube 1, the deformation resistance portion 4 is arranged at a position offset to the inside over the entire circumference of the support ring 2. It is necessary to keep it.

<6> Other members (Fig. 2)
It is desirable that the storage unit 6 be provided with a mechanism for storing the deformation resistance unit more suitably.
For example, there is a method of providing a U-shaped guide portion 7 that connects the skirt portions of the adjacent deformation resistance portions 4.
It is desirable that the guide portion 7 be bent with a gentler curvature than that of the distal end portion 41 of the deformation resistance portion 4. With this configuration, since the guide portion 7 is wider than the deformation resistance portion 4, the distal end portion 41 is reliably guided inward of the duct, and the deformation resistance portion 4 comes into contact with the wind tube 1 and the wind tube 1 Breakage can be prevented.
Moreover, this guide part 7 can function also as a reinforcement member for connecting each deformation resistance part 4 and improving rigidity.

<7> Example of operation (Figs. 1, 3, 4)
The operation of the shrink duct according to the present invention will be described.

(1) When extended (Fig. 1)
FIG. 1 shows a state in which the support ring 2 is separated and the wind tube 1 is fully extended.
In this state, even if a negative pressure is generated by suction in the duct, the wind tube 1 is under tension, so the ring frame 3 is originally in a state in which the wind tube 1 is not easily displaced.

(2) When contracted (Fig. 3)
[Storage of deformation resistance part]
FIG. 3 shows a state in which the right support ring 2 approaches and a part of the wind tube 1 is contracted.
The deformation resistance portion 4 extending from one support ring 2 is guided by a guide portion 7 provided on the other adjacent support ring 2, and the deformation resistance portion 4 provided on the other support ring 2 is also guided to the wind tube 1. It is accommodated in the accommodating part 6 without interfering with.

[Folding the wind pipe]
The wind tube 1 between the support rings 2 is loosened between the ring frames 3 and folded inside the duct. Since the folded portion is stored in the offset portion 5, the folded portion does not block the contraction operation of the wind tube 1.

(3) When negative pressure is generated (Fig. 4)
When a negative pressure is generated inside the duct by the suction operation of the duct, the contracted wind tube can move by the contraction, and thus the wind tube 1 may be displaced by the negative pressure.
At this time, the ring frame 3 is blocked by the deformation resistance portion 4 in the course of displacement. By this operation, it is possible to suppress the cross-sectional defect of the wind tube 1 due to the occurrence of negative pressure.
Further, since the deformation resistance portion 4 has a mountain shape and has a planar (two-dimensional) restraining force, even if a large negative pressure is generated, the movement of the ring frame 3 can be sufficiently restrained, The displacement of the ring frame 3 can be reliably suppressed.

DESCRIPTION OF SYMBOLS 1 Wind pipe 1a Folded wind pipe 2 Support ring 21 Hanging ring 3 Ring frame 3a Ring frame 3b at the time of normality Ring frame 4 at the time of negative pressure generation Deformation resistance part 41 Tip part 5 Offset part 6 Storage part 7 Guide part b Bellow width h Offset length

Claims (4)

A flexible wind pipe, a plurality of support rings arranged at intervals in the axial direction of the wind pipe, and a ring frame arranged between the support rings to maintain the shape of the wind pipe. A telescopic duct having at least the telescopic movement of the wind pipe by moving the support ring back and forth,
A plurality of deformation resistance portions that are provided so as to extend from the support ring in the axial direction of the wind tube and have a mountain shape, further comprising:
Telescopic duct.   The deformation resistance portion provided on one end side of the support ring is provided by shifting the deformation resistance portion on the other end side of the support ring in a circumferential direction of the support ring. The telescopic duct described.   The space between each deformation resistance portion provided on one end side of the support ring is a storage portion for each deformation resistance portion provided on the other end side of the support ring adjacent to the support ring. Item 3. The telescopic duct according to item 1 or 2. The deformation resistance portion is provided at a position offset from the inner diameter of the wind tube to the inside,
4. The offset length according to any one of claims 1 to 3, wherein the offset length is equal to or longer than a length of a portion where the wind tube is bent and protrudes inward when the wind tube contracts. The telescopic duct described.

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