JP3883483B2 - Suction duct - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a retractable suction air duct. The present invention particularly relates to a retractable suction air duct used as a suction duct in a ventilation device installed in a tunnel or the like during construction.
[0002]
[Prior art]
Conventionally, suction air ducts used as ventilation means in underground structures, tunnel structures, etc., are known in which a synthetic resin sheet having airtightness and flexibility is formed into a cylindrical shape, and a steel wire is joined thereto. (For example, refer to Patent Document 1).
[0003]
Conventionally, for example, for the purpose of removing harmful substances such as dust generated on the face, ventilation in the tunnel under construction has been performed (for example, see Patent Document 2). In addition, the present inventors previously arranged wind tunnels for forcibly introducing external air into the tunnel of the tunnel under construction from the entrance to the face, and dust generated in the face, etc. In the tunnel including the installation position of the dust collector by making the exhaust amount by the dust collector larger than the forced introduction amount of the external air. In the ventilation apparatus for forming an air curtain band, a ventilation apparatus in a tunnel under construction is proposed, characterized in that a suction duct having a predetermined length is provided on the suction side of the dust collector toward the face (Japanese Patent Application 2002). − 64777). The ventilator has an excellent effect of being able to clean the air in all the tunnels from about 50 m behind the face to the wellhead regardless of the progress of the face.
[0004]
The suction duct is composed of a soft material such as a synthetic resin sheet and a cylindrical steel wire that reinforces it from the inside, and can be expanded and contracted in the tunnel direction according to the progress of the face and evacuation at the time of blasting. And the device which is not obstruct | occluded with respect to the suction pressure of a dust collector is made | formed.
However, it has been found that with this type of suction duct, the suction duct is twisted to create a closed state during suction, particularly when the duct is in a contracted state and in a reduced portion of the duct.
[0005]
[Patent Document 1]
Japanese Patent Laid-Open No. 11-311443 (2nd page [0001])
[Patent Document 2]
JP 2002-221000 A (column of claims)
[0006]
[Problems to be solved by the invention]
An object of the present invention is to provide a suction duct that can be expanded and contracted without being blocked against the suction pressure even when connected to an air inlet of a blower or a dust collector.
[0007]
[Means for Solving the Problems]
The first invention of the present application is a stretchable suction duct composed of a flexible sheet and a shape retaining ring joined to the inside or the outside from the inside, and a sliding ring is fixed to the center of the shape retaining ring, The sliding ring is slidably fitted to a guide rod extending in the axial direction of the suction duct.
The sliding ring is preferably fixed to a spoke arranged in a cross shape inside the shape retaining ring.
A second invention of the present application is a telescopic suction duct comprising a flexible sheet and a shape retaining ring joined to the inside or the outside from the inside, and a plurality of slides inscribed in the at least two adjacent shape retaining rings A torsion prevention unit comprising a bar and a connecting ring for folding the plurality of slide bars in a circumferential shape is provided adjacent to the suction duct.
It is preferable that the connection ring and the shape retaining ring are fixed. It is preferable that both ends of the plurality of slide bars are bent inside the suction duct.
The suction duct according to the first invention or the second invention is disposed in the tunnel of the tunnel under construction from the tunnel entrance to the face, and is installed in the tunnel to forcibly introduce external air. It is composed of a dust collector that collects dust generated in the air and exhausts the purified air toward the wellhead, and installs the dust collector by making the exhaust amount by the dust collector larger than the forced introduction amount of the external air It is preferable that the suction duct in the ventilation device in the tunnel under construction in which an air curtain zone is formed in the tunnel including the position and a suction duct having a predetermined length is provided on the intake side of the dust collector facing the face.
[0008]
[Action]
According to the first aspect of the invention, since the sliding ring is allowed to slide only along the guide rod, the shape retaining ring is also movable only in the axial direction of the suction duct. Therefore, the suction duct is not twisted by the suction pressure inside.
According to the second invention, the slide bar is slidable in contact with the shape retaining ring, and the shape retaining ring is restrained from the inside of the suction duct by the slide bar. Therefore, the suction duct is not twisted by the suction pressure inside.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment in which the suction duct according to the present invention is used as a suction duct in a ventilation device installed in a tunnel under construction will be described as an example with reference to the drawings.
FIG. 3 shows a tunnel ventilation device 10 having a wind tube 14 and a dust collector 20 as main components. In the figure, a white arrow indicates a flow of fresh air or purified air, and a black arrow Represents the flow of contaminated air. Inside the tunnel of the tunnel 11 under construction, a wind pipe 14 made of a synthetic resin sheet is arranged from a wellhead (not shown in the figure in FIG. 3) toward the face 12, and the wind pipe 14 is exposed to fresh outside. Air is supplied. The air is used to replenish the combustion oxygen for the internal combustion engine and the breathing oxygen for the workers that are consumed in the underground work, and the power consumption required for long-distance ventilation. The minimum amount is necessary.
[0010]
A dust collector 20 is installed in front of the face 12 to collect dust and fumes generated at the face 12.
The rated air volume of the dust collector 20 is selected so that the exhaust volume of the dust collector 20 is larger than the forced introduction amount of external air, and has a capacity capable of sufficiently capturing contaminated air such as dust generated from the face 12. is required. Although depending on the size of the tunnel, for example, when the tunnel cross section is about 80 m ² , a maximum air volume of about 1500 m ³ / min is used. The dust collector 20 preferably has a continuous automatic regeneration function in consideration of measures for preventing clogging of the filter.
[0011]
A suction duct 24 is connected to the air inlet 22 of the dust collector 20 toward the face 12 side. The suction duct 24 is composed of a flexible sheet made of synthetic resin or the like and a circular or spiral steel wire joined to this from the inside or the outside. The suction duct 24 can be expanded and contracted in the tunnel direction of the tunnel 11, and the dust collector 20. It is difficult to block even with respect to the suction pressure, and the shape is held in a cylindrical shape.
Regarding the length of the suction duct 24, it is important to take a length necessary for forming an air curtain, which will be described later, at the installation position of the dust collector 20, as well as the traveling speed of the face 12 and the evacuation distance at the time of blasting. Decided in consideration.
The suction duct 24 is attached to a guide rail 30 laid along the side wall of the tunnel 11, and the electric winch 32 is driven to expand and contract the suction duct 24. In FIG. 3, reference numeral 33 denotes a push rod for fixing and supporting the suction duct 24 provided in the dust collection carriage 21, and reference numeral 34 denotes an anchor (hanging tool) for fixing the guide rail 30 to the side wall. .
[0012]
In the embodiment of the ventilator, fresh air is supplied from the wind tube 14 in the vicinity of the face 12, and dust generated in the face 12 is sucked from the tip suction port 25 of the suction duct 24 and has a large capacity. All are captured by the dust collector 20. As a result, the air purified from the exhaust port 26 of the dust collector 20 is blown out through the tunnel toward the rear tunnel.
At this time, the purified air amount Q ₂ discharged from the exhaust port 26 is set to be larger than the fresh air amount Q ₁ supplied to the face 12, so that the inside of the mine corresponding to Q ₂ -Q ₁ is calculated from the air amount balance. Air flows from the tunnel toward the face 12. As a result, an air curtain zone is formed in the tunnel between the tip suction port 25 of the suction duct 24 and the exhaust port 26 of the dust collector 20. Accordingly, dust generated at the face 12 is blocked by the air curtain and reliably collected by the dust collector 20, so that purified air always flows through the tunnel. Further, exhaust gas from the diesel engine in the tunnel is also ventilated by this purified air, and there is no risk of exhaust gas concentration.
[0013]
Next, the suction duct of the present invention will be described with reference to FIG.
FIG. 1 is a partial perspective view showing the inside of the suction duct 24 as seen through. As described above, the outer shape is constituted by the flexible sheet 40 and the shape holding ring 42 joined to the flexible sheet 40 from the inside or the outside. ing. The shape retaining ring 42 is a circular or spiral steel wire.
A spoke 44 having flat bars arranged in a cross shape is fixed inside the shape retaining ring 42 by means such as welding, and a sliding ring 46 is fixed toward the center of the spoke 44. For the sliding ring 46, an SGP or an oilless ring cut to an appropriate length can be used. The spoke 44 is not necessarily limited to a cross shape, and may have any shape as long as the sliding ring 46 can be fixed to the central portion of the suction duct 24.
[0014]
The sliding ring 46 is slidably fitted to a guide pipe 48 made of a vinyl chloride pipe that is installed extending in the axial direction of the suction duct 24, and the sliding ring 46 slides only along the guide bar 48. Therefore, the shape retaining ring 42 integrated with the sliding ring 46 is also movable only in the axial direction of the suction duct 24. As a result, the suction duct 24 constituted by the flexible sheet 40 and the shape retaining ring 42 is not twisted by an unexpected pressure from the outside as well as an internal suction pressure.
For convenience of illustration, only one shape retaining ring 42 is shown in FIG. 1 and the other shape retaining rings 42 are omitted, but the suction duct 24 has an inner diameter of 1 to 2 m and a length of 3 to 10 m. If so, the shape retaining ring 42 is provided every 10 to 50 cm. The spokes 44 and the sliding rings 46 do not have to be installed on all the shape retaining rings 42. For example, every two to five rings may be installed at intervals that do not cause twisting.
[0015]
Next, another embodiment of the suction duct will be described with reference to FIG.
FIG. 2 is also a perspective view showing the inside of the suction duct 24 as seen through, and the shape holding rings 42, 42,... Are shown with small circles for convenience of illustration. In the suction duct 24, a plurality of slide bars 52, 52,... That are inscribed in at least two adjacent shape retaining rings 42, and the plurality of slide bars 52, 52,. An anti-twisting unit 50, 50, 50 comprising a connecting ring 54 to be laid is provided adjacently. The slide bar 52 can be manufactured by a conduit or the like, and the connecting ring 54 can be manufactured by bending a flat bar.
[0016]
The connecting ring 54 is fixed to the shape retaining ring 42 by a fastening string or other appropriate means, and the slide bar 52 constituting the twist preventing unit 50 is inscribed in the shape retaining ring 42 adjacent to the fixed shape retaining ring 42. And is slidable.
Thus, all the shape retaining rings 42, 42,... Are restrained from the inside of the suction duct 24 by the slide bars 52, 52,. It is not twisted by pressure.
Both end portions of the slide bar 52 are bent inside the suction duct 24 in order to prevent the flexible sheet 40 from being caught or bitten when the suction duct 24 contracts.
[0017]
【The invention's effect】
According to the present invention, even when connected to the air inlet of a blower or a dust collector, it is possible to obtain a retractable suction duct that does not block against the suction pressure and can be stretched.
In addition, when using the retractable suction duct as a suction duct in a ventilation device installed in a tunnel or the like during construction, the suction port is approached immediately before the face during suction work and retracted during blasting work. The duct can be expanded and contracted very easily and reliably. For this reason, it has the outstanding effect that it can implement continuously, without interrupting the ventilation work in a tunnel during construction. In addition, the safety of tunnel construction will be further secured.
[Brief description of the drawings]
FIG. 1 is a partial perspective view illustrating the inside of a suction duct according to the present invention.
FIG. 2 is a perspective view illustrating the inside of a suction duct as another embodiment.
FIG. 3 is a tunnel cross-sectional view showing a ventilation device installed in a tunnel under construction including a suction duct.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Tunnel ventilation apparatus 11 Tunnel 12 Face 14 Wind pipe 20 Dust collector 24 Suction duct 40 Flexible sheet 42 Shape holding ring 44 Spoke 46 Slide ring 48 Guide rod 50 Torsion prevention unit 52 Slide bar 54 Connection ring

Claims (4)

  A retractable suction duct comprising a flexible sheet and a shape retaining ring joined to the inside or the outside from the flexible sheet, a plurality of slide bars inscribed in the at least two adjacent shape retaining rings, A suction duct, characterized in that a torsion prevention unit comprising a connecting ring for folding a slide bar circumferentially is provided adjacent to the suction duct. The suction duct according to claim 1, wherein the coupling ring and said shape retaining ring is fixed. The suction duct according to claim 1 or 2, wherein both end portions of the plurality of slide bars are bent toward the inside of the suction duct. The suction duct is installed in the tunnel of the tunnel under construction from the entrance to the face, and a wind pipe for forcibly introducing external air, and installed in the tunnel, collects dust generated at the face. A dust collector that exhausts the purified air toward the wellhead, and the air curtain zone in the tunnel including the installation position of the dust collector by making the exhaust amount by the dust collector larger than the forced introduction amount of the external air forming a claims 1 to 3, wherein any one, characterized in that the predetermined length of the suction duct to the intake side of the dust collector is the suction duct in the ventilation system construction in the tunnel provided toward the working face Suction duct.

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