JP6319863B2 - Blower for human hole - Google Patents

Description

  The present invention relates to a blower for a human hole that is installed in a human hole lid frame provided at the upper end of a human hole, that is, a manhole, and that allows air to flow into an underground pipe culvert or an underground pipe line.

  Conventionally, a frame (manhole cover frame) on which a manhole cover provided in the manhole is placed in order to ensure safety when an operator enters and exits an underground pipe pit or an underground conduit from a manhole. ) Is known. For example, Patent Document 1 discloses a safety work fence for a manhole that has a receiving surface formed in an annular shape and is detachably attached to a manhole cover frame.

JP 2011-26818 A

  By the way, because there is a risk of oxygen deficiency in the underground pipes or underground pipes, or when toxic gas is filled, when workers work in underground pipes or underground pipes, It is necessary to send ground air into underground pipes or underground pipes. Therefore, for example, by inserting an air duct connected to a blower installed on the ground into the human hole through the opening of the opened human hole and blowing it into the underground pipe or underground pipe, A blower for human holes is used to ventilate underground pipes.

  However, when such a blower for a human hole is used, the air duct is formed with a relatively large diameter so as to have a sufficient air supply function. The part will be closed. This makes it difficult for the operator to enter and exit with the air duct inserted into the human hole. Further, since the air duct extends from the opening of the human hole to the ground, it is not possible to secure a space for providing the grip member on the human hole cover frame.

  Therefore, when the worker enters and exits the manhole, the air duct is taken out from the manhole, and then the gripping member is installed on the manhole cover frame. Therefore, the air duct is taken out from the manhole, the gripping member is installed on the manhole cover frame, the worker enters and exits the manhole, and then the gripping member is removed and the air duct is inserted into the manhole. While going, you can't blow to underground pipes or underground pipes. In this way, if there is no ventilation for a long time while working in the underground pipe or underground pipe, oxygen deficiency or filling of toxic gas may occur in the underground pipe or in the underground pipe. There is a danger.

  SUMMARY OF THE INVENTION Accordingly, the present invention provides a blower for a human hole that allows an operator to safely enter and exit the human hole while the fan is ventilating from the opening of the human hole to the underground pipe culvert or the underground pipeline. With the goal.

  The blower for a human hole according to the present invention is a cylindrical member extending in an annular shape or an arc shape, and can be placed on the upper surface side of a human hole cover frame provided at the upper end portion of the human hole, and the inside is compressed. A frame body through which air can flow, compressed air supply means for supplying compressed air into the frame body, and one or more arranged along the periphery of the frame body, receiving compressed air flowing through the frame body and receiving the compressed air A compressed air jetting device capable of generating an air flow that causes air around the frame to flow into the human hole by blowing out air radially inward and downward of the frame, and provided substantially horizontally above the frame And a holding frame extending in an annular or arc shape substantially concentric with the frame, and a connecting member extending in the vertical direction and connecting the frame and the holding frame.

  Thereby, since the compressed air ejecting device is provided along the periphery of the frame body, even when the compressed air ejecting device is attached to the upper end portion of the human hole, an operator easily enters and exits the opening portion of the human hole. It becomes possible. Further, since the gripping frame has an annular shape or an arc shape concentric with the frame body, it does not hinder the generation of an air flow by the compressed air ejection device or the entry / exit of the worker into the human hole.

  According to the present invention, in a state where the compressed air ejection device and the gripping frame are attached to the upper surface side of the manhole cover frame, the worker does not hinder the entrance and exit of the manhole. It is possible for a worker to safely enter and exit the human hole.

It is sectional drawing which shows roughly the structure and effect | action of the air blower of this invention. It is the schematic sectional drawing which expanded a part of blower for human holes of this invention. It is a perspective view of the air blower main body of this invention in the state installed in the manhole cover frame. It is a side view of the air blower main body of this invention.

  1 to 4 show an embodiment of the present invention.

  As shown in FIG. 1, a blower 1 for a human hole of the present invention includes a blower body 11 installed on the upper surface side of a human hole cover frame F of a human hole M, and a compressor 2 installed on the ground to generate compressed air. And an air deflector 3 installed at a connecting portion between the manhole M and the underground pipe rod D.

  The manhole M is a passage extending in the vertical direction that connects the ground and the underground pipe rod D. The lower end of the manhole M is connected to the ceiling portion of the underground pipe ridge D, and an opening to the ground is formed at the upper end. The opening at the upper end of the human hole M is formed in a circular shape, and a human hole cover frame F for placing an iron cover (not shown) is provided. The manhole cover frame F is an annular iron member having an upper surface formed in a horizontal shape, and a receiving surface portion on which an iron cover is placed is provided on an inner peripheral surface below the upper surface.

  As shown in FIGS. 2 and 3, the blower main body 11 includes a frame 100 that is a cylindrical member that extends in an arc shape, and a nozzle 200 that is a compressed air ejection device that is arranged in plural along the periphery of the frame 100. , And an arc-shaped gripping frame 300 disposed above the frame body 100.

  The frame 100 is formed in an arc shape having substantially the same diameter as the receiving surface portion of the human hole lid frame F, and as shown in FIGS. 2 and 3, the frame body 100 receives the human hole lid frame F with the iron lid removed. It can be placed on the surface. The frame 100 has a receiving port 101 to which the supply air hose 21 connected to the compressor 2 can be connected, and a supply port 102 to which the branch air hose 201 connected to the nozzle 200 can be connected, and is a hollow frame 100. The inside is a flow path for compressed air.

  The receiving port 101 is provided on the outer diameter side of a substantially intermediate portion of the arcuately extending frame 100, receives compressed air generated by the compressor 2 through the supply air hose 21, and enters the inside of the frame 100. And let compressed air flow in.

  The supply ports 102 are provided at four locations on the upper portion of the frame body 100, and supply compressed air that has flowed into the frame body 100 to the branch air hose 201. Therefore, the frame 100 serves as a manifold that collects the compressed air flowing in from the receiving ports 101 and distributes the compressed air to the four supply ports 102.

  Four nozzles 200 are provided at equal intervals along the circumferential direction of the frame 100, and a cylindrical nozzle body 202 that extends substantially in the vertical direction, and an intake section 203 that is provided at the top of the nozzle body 202 and takes in air. And a jet part 204 that is provided at the lower end part of the nozzle body 202 and discharges air downward.

  The nozzle body 202 is fixed to the nozzle bracket 205, which is a plate-like member extending upward from the upper surface of the frame body 100, with a slight inclination so that the lower side of the nozzle body 202 is radially inward of the frame body 100 from the upper side. ing. The nozzle body 202 is connected at one end to the other end of the branch air hose 201 connected to the supply port 102 of the frame 100. The nozzle body 202 receives compressed air from the branch air hose 201, and the received compressed air is a hollow nozzle body 202. It is discharged toward the lower side.

  The intake portion 203 is a cylindrical member that takes in external air and supplies the taken air into the nozzle body 202 from above. The upper part and the side of the intake part 203 are covered with an intake part cover 203a whose lower part is open. The intake portion 203 has an opening on the upper surface side, and takes in external air that has entered from the lower portion of the intake portion cover 203a into the intake portion 203 through the opening. The air intake portion cover 203a prevents the air intake portion 203 from taking in foreign matter such as dust together with air, and can prevent a reduction in suction force due to the attachment of foreign matter and entry of foreign matter into the human hole M. Further, the sound absorbing material included in the air intake cover 203a can mute and absorb high-frequency sound generated in the nozzle body 200.

  The ejection portion 204 has a cylindrical shape that is coaxial with the nozzle body 202 and has a smaller diameter than the nozzle body 202. The ejection part 204 has an upper end continuous with the lower end of the nozzle body 202 and has an opening at the lower end. The ejection part 204 takes in the air in the nozzle main body 202 from the upper end part, and discharges it outside from the opening part of a lower end part.

  When the compressed air supplied from the branch air hose 201 is released into the nozzle main body 202, the air taken in from the intake portion 203 is drawn into the nozzle main body 202 to generate an air flow that flows downward. Then, the air flow generated in the nozzle body 202 is ejected from the ejection portion 204 toward the radially inner lower side of the frame body 100. Since the ejection part 204 has a smaller diameter than the nozzle body 202, the air flow ejected from the ejection part 204 has a higher flow velocity than the air flow generated in the nozzle body 202, and the human hole is entrained with surrounding air. Flows into M. Thereby, as shown by the arrow in FIG. 2, the nozzle 200 can send a large amount of air into the human hole M.

  The gripping frame 300 is a cylindrical member that is concentric with the frame body 100 and extends in an arc shape having a slightly larger diameter than the frame body 100. The gripping frame 300 is provided substantially horizontally above the frame body 100 via a connecting plate 301 that is detachably provided on the upper portion of the nozzle bracket 205.

  As shown in FIG. 4, the connecting plate 301 is a plate-like member extending in the radial direction of the frame 100, and a lower plate 301 a in which the radially inner end of the frame 100 is detachably connected to the nozzle bracket 205, A plate-like member extending in the vertical direction, a vertical plate 301b in which a lower end portion and a radially outer end portion of the frame body 100 of the lower plate 301a are continuous, and a plate-like member extending in the radial direction of the frame body 100 It is a connecting member constituted by an upper plate 301c in which the radially outer end of the body 100 is continuous with the upper end of the vertical plate 301b. The lower plate 301a, the vertical plate 301b, and the upper plate 301c are integrally formed, and the radially inner end of the frame body 100 of the upper plate 301c is connected to the outer peripheral surface of the gripping frame 300. The connecting plate 301 includes a lower plate 301 a and an upper plate 301 c so that the vertical plate 301 b is positioned radially outside the frame 100 with respect to the nozzle 200, thereby avoiding contact with the nozzle 200. Further, the vertical plate 301 b extends upward from the upper portion of the nozzle 200, and the upper plate 301 c and the gripping frame 300 are positioned above the nozzle 200.

  The gripping frame 300 has two auxiliary gripping members 302 below the gripping frame 300. The auxiliary gripping member 302 is a cylindrical member extending in an arc shape having a slightly smaller diameter than the gripping frame 300. The auxiliary gripping member 302 is provided substantially horizontally between the gripping frame 300 and the frame body 100 via an auxiliary bracket 303 provided on the lower side of the gripping frame 300. The center angle of the arc of the two auxiliary gripping members 302 is about 60 °, whereas the center angle of the arc of the gripping frame 300 is about 270 °. Therefore, the auxiliary gripping member 302 is formed to have a length that is one-fourth or less of the gripping frame 300. Two auxiliary gripping members 302 are provided two by two so as to face each other across the center point of the gripping frame 300.

  The auxiliary bracket 303 is a columnar member that extends from the lower part of the outer peripheral surface of the gripping frame 300 downward and slightly inward in the radial direction of the gripping frame 300 to a substantially intermediate portion between the frame body 100 and the gripping frame 300. The lower end portions of the two auxiliary brackets 303 are respectively connected to the upper outer peripheral surface of the end portion of the auxiliary gripping member 302, and the auxiliary bracket 303 supports the auxiliary gripping member 302 below the gripping frame 300. ing. The interval between the two auxiliary brackets 303 is narrower than the interval between the two nozzles 200, and the auxiliary gripping members 302 are respectively positioned between the two nozzles 200. Accordingly, the two auxiliary gripping members 302 are positioned between the frame 100 and the gripping frame 300 in the up and down direction, and are positioned between the two nozzles 200 in the circumferential direction. Opposite across the arc center.

  As described above, as illustrated in FIG. 4, the nozzle 200 is provided along the frame body 100 in an inclined state so that the upper side is the radially outer side of the frame body 100, and the gripping frame 300 is provided with the frame body 100 and the nozzle. It is provided horizontally above 200. Further, the connecting plate 301 that connects the frame body 100 and the gripping frame 300 is provided so as to protrude outward in the radial direction from the frame body 100. Further, an auxiliary gripping member 302 is provided between the frame body 100 and the gripping frame 300. Accordingly, the members positioned radially inward from the frame body 100 are only the lower end portion of the nozzle 200 and the auxiliary gripping member 302. Even if the blower body 11 is installed on the upper surface of the human hole cover frame F, the human hole The upper part of the opening of M is in an open state.

  The compressor 2 has an air compression unit (not shown) driven by an electric motor (not shown), and a supply air hose in which compressed air generated by the air compression unit is connected to the receiving port 101 of the frame body 100. It is supplied to the frame 100 of the blower main body 11 through 21.

  The air deflector 3 is a rectangular sheet using a flexible member such as nylon. One end of a rope 31 (see FIG. 1) is connected to the left and right corners on one end of the air deflector 3 and the substantially central portion on the other end. In addition, rope locking portions 32 that can lock the other end side of the rope 31 are provided at a total of six locations including the radially outer side of the gripping frame 300 of the blower body 11 and the upper portion of the upper plate 301c. When the air deflector 3 is used, the other end side of the rope 31 is locked to the three rope locking portions 32 among the six rope locking portions 32. Then, the three ropes 31 are suspended together with the air deflector 3 to the vicinity of the bottom in the manhole M, and the air deflector 3 is installed at the connecting portion between the manhole M and the underground pipe rod D. At this time, the rope 31 connected to the other end side of the air deflector 3 among the three ropes 31 is suspended below the other two ropes 31 so that one end side of the air deflector 31 is the other end. It can be set as the state inclined so that it might become upper than the side. Further, the installation position of the air deflector 3 in the vertical direction can be adjusted by adjusting the length of the rope 31 suspended from the rope locking portion 32. Thereby, as shown by the arrow in FIG. 1, the flow direction of the air flow sent downward from the upper end portion of the human hole M by the blower main body 11 can be changed from the vertical direction to the horizontal direction. Thus, by changing the flow direction of the air flow toward the direction of the underground pipe rod D into which air is desired to flow, air can be efficiently introduced into the underground pipe rod D.

  The procedure for an operator to enter from the opening of the human hole M and to work on the underground pipe rod D using the human hole blower 1 configured as described above will be described.

  First, the iron lid is removed from the manhole cover frame F, the frame body 100 is placed on the receiving surface portion of the manhole cover frame F, and the blower body 11 is installed at the opening of the manhole M. Since the connecting plate 301 is detachably provided on the nozzle bracket 205, when the gripping frame 300 is not used, the gripping frame 300 can be detached from the blower body 11 together with the connecting plate 301. It is also possible to attach the gripping frame 300 after placing the frame body 100 on the manhole cover frame F.

  Next, the supply air hose 21 extending from the compressor 2 is connected to the receiving port 101, and one end side of the rope 31 is locked to the rope locking portion 32, and the air deflector 3 supported on the other end portion of the rope 31 is attached. Installed at the connection between the manhole M and the underground pipe pit D. Then, when the compressor 2 is driven and compressed air is supplied to the blower body 11, an air flow flows from the nozzle 200 into the human hole M.

  When the air flow sufficiently flows into the manhole M and the underground pipe rod D, the worker enters the manhole M through the opening of the manhole M. At this time, the worker can put his / her foot on a footrest (not shown) provided on the inner wall of the human hole M while holding the gripping frame 300 and the auxiliary gripping member 302 with both hands. That is, the gripping frame 300 is gripped with both hands, the worker's body is moved above the human hole M, and then both hands are moved to the auxiliary gripping member 302 and lowered.

  When the worker exits from above the manhole M, the worker ascends using the footrest of the inner wall of the manhole M, and assists when the upper body of the worker exits from the opening of the manhole M to the ground. The gripping member 302 for gripping and the gripping frame 300 are gripped in order, and the body is lifted to exit. In addition, when an operator enters and exits, it is possible to continue the flow of air through the manhole M and the underground pipe D by the blower 1 for manholes.

  In the present embodiment, the frame body 100, the gripping frame 300, and the auxiliary gripping member 302 are each formed to extend in an arc shape. However, the present invention is not limited to this. Any or all of the frame 300 and the auxiliary gripping member 302 may be formed in an annular shape.

  Further, the auxiliary gripping member 302 may be further installed in the circumferential direction and the vertical direction. Further, the auxiliary gripping member 302 may be provided so as to extend in the vertical direction instead of horizontally. Further, the auxiliary gripping member 302 may be formed in a linear shape instead of an arc shape or an annular shape. Further, the auxiliary gripping member 302 is provided between the frame body 100 and the gripping frame 300 in the present embodiment. However, the present invention is not limited to this. For example, the auxiliary gripping member 302 is a predetermined part of the gripping frame 300. The portions may be provided so as to be connected to each other, and may be provided so as to span the radially inner side of the gripping frame 300.

  As described above, according to the blower 1 for human holes of the present embodiment, the gripping frame 300 formed in an arc shape substantially concentric with the frame body 100 is provided above the frame body 100 formed in an arc shape. ing. Therefore, even when the blower main body 11 is installed on the manhole cover frame F, the worker can safely enter and exit while gripping the gripping frame 300. In addition, since the blower body 11 can continuously blow air into the human hole M even when the worker enters and exits, safety during work can be improved.

  Further, according to the blower 1 for human holes of the present embodiment, the auxiliary gripping member 302 is provided between the frame body 100 and the gripping frame 300, and the auxiliary gripping member 302 is more than the gripping frame 300. It is formed to extend in a small-diameter arc shape. Thereby, in the state which installed the air blower main body 11 in the manhole cover frame F, a worker can enter and exit safely. That is, at the time of entering and exiting, the operator holds the gripping frame 300 and also holds the auxiliary gripping member 302 positioned between the frame body 100 and the gripping frame 300, thereby ensuring safety. Can be moved up and down.

  Moreover, according to the blower 1 for human holes of this embodiment, the gripping frame 300 is detachably provided on the frame body 100. That is, since the connecting plate 301 is detachably provided on the nozzle bracket 205, the gripping frame 300 can be detached from the blower body 11 together with the connecting plate 301. Therefore, when only air is blown by the blower body 11 without using the gripping frame 300, or when there is an obstacle above the human hole M and the gripping frame 300 cannot be used, the blower body 11 is made compact. It is possible to handle when you want to carry it.

  Further, according to the blower 1 for human holes of the present embodiment, the connecting plate 301 that connects the frame body 100 and the gripping frame 300 is provided on the radially outer side than the frame body 100 and the gripping frame 300. . That is, the connecting plate 301 includes the lower plate 301a and the upper plate 301c, so that the vertical plate 301b is positioned radially outside the frame body 100 and the gripping frame 300. Projecting radially outward from the frame 300. Thereby, it is possible to prevent a tool bag or the like carried by the worker from coming into contact with the connecting plate 301, and it is possible for the worker to smoothly enter and exit the radially inner side of the frame body 100 and the gripping frame 300. Become.

DESCRIPTION OF SYMBOLS 1 Person hole blower 2 Compressor 3 Air deflector 11 Blower main body 21 Supply air hose 31 Rope 32 Rope latching part 100 Frame body 101 Receiving port 102 Supply port 200 Nozzle 201 Branch air hose 202 Nozzle main body 203 Intake part 203a Intake part cover 204 Ejection part 205 Nozzle bracket 300 Grasping frame 301 Connecting plate 301a Lower plate 301b Vertical plate 301c Upper plate 302 Auxiliary gripping member 303 Auxiliary bracket M Human hole D Underground pipe ridge F Human hole lid frame

Claims (3)

A cylindrical member extending in an annular or arcuate shape, and can be placed on the upper surface side of a human hole lid frame provided at the upper end of the human hole, and a frame body through which compressed air can flow;
Compressed air supply means for supplying compressed air into the frame;
One or more are arranged along the periphery of the frame body, receive the compressed air flowing through the frame body, and eject the received compressed air toward the inner side in the radial direction of the frame body. A compressed air ejection device capable of generating an air flow flowing into the human hole;
A gripping frame provided substantially horizontally above the frame and extending in a ring or arc substantially concentric with the frame;
A connecting member that extends in the vertical direction and connects the frame and the gripping frame;
Equipped with a,
The gripping frame is formed to extend in the shape of a ring or arc having the same diameter as the frame or a larger diameter than the frame,
The connecting member has an upper plate and a lower plate extending in the radial direction of the frame body, and a vertical plate extending in the vertical direction. A radially outer end portion of the upper plate is connected to an upper end portion of the vertical plate, and the diameter of the lower plate The direction outer end is connected to the lower end of the vertical plate,
The inner end of the lower plate in the radial direction is connected to the fixed portion between the compressed air ejecting device and the frame, and the inner end of the upper plate in the radial direction is connected to the gripping frame so that the connecting member is the frame. And a blower for a human hole provided on the outer diameter side of the gripping frame .   The gripping frame includes one or a plurality of auxiliary gripping members below the gripping frame and above the frame body and radially inward of the gripping frame. Blower for human holes.   The blower for manhole according to claim 1 or 2, wherein the connecting member is detachably provided on the frame.

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