JP2014047562A - Guard fence for shaft - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a guard fence for a shaft, which surely prevents an outsider from entering.SOLUTION: A guard fence 10 can surround a circumference of a rectangular opening 90 of a shaft 9 substantially vertically bored. The guard fence 10 includes a first grating 1, a pair of second gratings 2, 2, a pair of connectors 3, 3, and a chain 4. The first grating 1 can close the opening 90 and can stand by being rotatably connected to one side of a pair of first sides of the opening 90. The pair of second grating 2, 2 are arranged so as to be retractable along an inner wall connected to a pair of second sides, and can protrude and stand on the pair of second sides of the opening 90. The pair of connectors 3, 3 can mutually connect the first grating 1 and the pair of second gratings 2, 2. The chain 4 is stretched between the second gratings 2, 2 to prevent an outsider from entering.

Description

  The present invention relates to a protective fence for shafts. In particular, the present invention relates to a structure of a protective fence that surrounds a shaft of the shaft so that an outsider cannot easily enter the shaft that is drilled substantially vertically.

  In power plants and the like, shafts having rectangular openings for workers to enter are provided in the premises and buildings. Usually, the openings of these shafts are closed with a grating in which materials are assembled in a lattice pattern. When the worker enters the shaft, the grating is removed, a plurality of safety cones are installed around the shaft opening, and a cone bar is bridged between the safety cones so that an outsider can We were calling attention so that we could not enter.

  Protective measures combined with a safety cone and corn bar can call attention to prevent outsiders from entering the shaft. However, these safety cones are only erected by adding a “weight”, and it is difficult to reliably prevent outsiders from entering.

  In order to solve such problems, a pair of gratings for closing the shaft opening and a pair of side frames covering these gratings are provided, and these gratings and the side frame are erected to surround the four sides of the shaft opening. A protective fence is disclosed (for example, see Patent Document 1).

  In order to solve such problems, a pair of gratings that close the shaft opening and a pair of side frames that cover these gratings are provided. A protective fence is disclosed in which one side frame falls to the outside and facilitates access to the shaft (for example, see Patent Document 2).

Japanese Utility Model Publication No. 5-57243 JP-A-9-256658

  The protective fence according to Patent Document 1 has an advantage that assembly is easy because a pair of gratings are provided with counterweights and these gratings are configured to be freely raised and lowered. However, the protective fence according to Patent Document 1 raises a pair of gratings and side frames and surrounds the four sides of the shaft of the shaft, which is inconvenient for workers to enter and exit the shaft.

  On the other hand, since the guard fence according to Patent Document 2 is configured such that one side frame falls down outside, it is easy for an operator to enter and exit the shaft. However, the guard fence according to Patent Document 2 has a problem that it is necessary to get over one side frame or walk on one side frame in order for an operator to enter and exit the shaft. There is a need for a shaft protection fence that reliably prevents outsiders from entering and allows workers to easily enter and leave the shaft. The above can be said to be the subject of the present invention.

  This invention is made | formed in view of such a subject, and it aims at providing the protection fence for shafts which an operator can enter / exit easily while preventing an outsider's approach reliably.

  The present inventor includes a first grating that can be opened and closed to close the opening of the shaft, and a pair of second gratings that can slide along the inner wall of the shaft, and the first and second gratings are erected to each other. By connecting, the three sides of the shaft opening of the shaft are protected, and in the open part facing the first grating, a chain is bridged between the pair of second gratings to ensure that the outsider enters. It was considered that the operator could easily enter and exit the shaft by removing the chain, and based on this, the following new shaft protection fence for the shaft was invented.

  (1) A shaft protection fence according to the present invention is a shaft protection fence that surrounds a rectangular opening of a shaft that is formed substantially vertically, and closes the opening and a pair of first of the openings. The first grating that can be raised and connected to one side of the side so as to be rotatable, and the inner wall connected to the pair of second sides that are substantially orthogonal to the pair of first sides are arranged so as to be able to appear and disappear. The first grating and the pair of second gratings are mutually connected so that the pair of rectangular second gratings that can stand up and protrude from the opening, and the first grating and the pair of second gratings are in an upright state. A pair of coupling tools to be coupled, and a chain that is bridged between the pair of second gratings and prevents a person from entering so as to be positioned on the other side of the pair of first side edges of the opening. .

  (2) The shaft protection fence according to the present invention has a connecting pin rotatably and slidably connected to both side surfaces of the second grating, and a base end portion at an upper end portion of the second side. The second grating is further provided with a pair of opposed pivot arms supported rotatably, the second grating guides the connecting pin, and has elongated holes on both sides from the upper end to the lower end, and the connection When the pin is locked to the upper end side of the elongated hole and the second grating is suspended, when the second grating is lifted and moved to the outside, the step that the second grating can be placed in an upright state At the upper end of the second side.

  (3) The protective fence for a shaft according to the present invention has a pair of the second grating in between so that the second grating can move toward the first grating in a state where the second grating stands at the step. It is preferable that the rotating arms are arranged at a predetermined interval.

  (4) The connector includes a hook member rotatably held in a slit groove formed in an upper corner portion of the second grating, and a rotation shaft fixed to a base end portion of the hook member. A rotation knob connected to the rotation shaft and projecting from one surface of the second grating, and the hook member is engaged with the first grating when the rotation knob is rotated in one direction. It is preferable to provide a fitting flange at the tip.

  (5) It is preferable that the second grating has a protrusion capable of anchoring the end of the chain.

  (6) A protection method for a shaft protection fence according to the present invention is a protection method for a shaft protection fence that surrounds a rectangular opening of a shaft that is drilled substantially vertically, and closes the opening. Along a rectangular first grating that can be rotatably connected to one side of a pair of first side edges of the opening, and an inner wall that continues to a pair of second side edges that are substantially orthogonal to the pair of first side edges. A pair of rectangular second gratings that can be projected and retracted and can stand up and protrude from the opening, and the first grating and the pair of second gratings are in a standing state so that the first grating and the pair of second gratings are in a standing state. A pair of couplers for connecting the second grating to each other and a pair of the second gratings so as to be positioned on the other side of the pair of first side edges of the opening to prevent human entry. And a chain In the protective fence for a mine, the first step of opening the first grating and raising the first grating to one side of the pair of first side edges of the opening and the pair of second gratings projecting from the opening A second step of raising the second grating on a pair of second sides of the opening, a third step of interconnecting the first grating and the pair of second gratings, and a pair of the openings. And a fourth step of preventing a person from entering by bridging the chain between the pair of second gratings so as to be located on the other side of the first side.

  The protection fence for a shaft according to the present invention opens the first grating that closes the opening of the shaft and raises the pair of second gratings from the inside of the shaft and protrudes so as to stand at the opening of the shaft. By connecting the second grating to the first grating, it is possible to protect three sides of the shaft opening. By passing the chain between the pair of second gratings in the other opened part, it is possible to reliably prevent outsiders from entering, and by removing the chain, workers can easily enter and exit the shaft.

It is a perspective view which shows the structure of the protection fence for shafts by one Embodiment of this invention, and is a state figure which is protecting the circumference | surroundings of the opening of a shaft. FIG. 3 is a plan view of a shaft protection fence according to the embodiment, in which the first grating closes the shaft opening. It is a top view of the protection fence for shafts by the said embodiment, is a state figure by which the 1st grating was opened and stood up and the 2nd grating was accommodated in the inside of a shaft. It is a longitudinal cross-sectional view of the protective fence for shafts according to the embodiment, and is a cross-sectional view taken along the line XX of FIG. It is a longitudinal cross-sectional view of the protective fence for the shaft according to the embodiment, and the state in which the first grating and the pair of second gratings are erected is viewed from a cross-section taken along the arrow YY in FIG. FIG. 3 is a plan view of a shaft protection fence according to the embodiment, in which a first grating and a pair of second gratings are erected. It is a perspective exploded view which shows the structure of the connection mechanism of the 2nd grating with which the protection fence for shafts by the said embodiment is equipped. It is a principal part enlarged view of the 2nd grating with which the protection fence for shafts by the said embodiment is equipped, FIG. 8 (A) is a left view of one 2nd grating, and the bottom face of 2nd grating is a level | step difference of a shaft. FIG. 8B is a left side view of one of the second gratings, and a state diagram in which the bottom surface of the second grating is separated from the step of the shaft, and FIG. It is a right view of B). It is the schematic which shows the procedure of the protection method of the protection fence for shafts by the said embodiment, and while showing the top view in the upper stage, and showing the longitudinal cross-sectional view in the lower stage, FIG. 9 (A) raised the 1st grating. FIG. 9B is a state diagram in which the other second grating is erected, FIG. 9C is a state diagram in which one second grating is erected, and FIG. 9D is a pair of It is the state figure which spanned the chain between 2nd gratings.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
[Configuration of protection fence for shafts]
Initially, the structure of the protective fence for shafts by one Embodiment of this invention is demonstrated.

  FIG. 1 is a perspective view showing the structure of a shaft protection fence according to an embodiment of the present invention, and is a state diagram that protects the periphery of a shaft opening. FIG. 2 is a plan view of the shaft protection fence according to the embodiment, in which the first grating closes the shaft opening. FIG. 3 is a plan view of the shaft protection fence according to the embodiment, in which the first grating is opened to stand and the second grating is accommodated in the shaft.

  FIG. 4 is a longitudinal sectional view of the shaft protection fence according to the embodiment, and is a sectional view taken along the line XX in FIG. FIG. 5 is a vertical cross-sectional view of the shaft protection fence according to the embodiment, and the state in which the first grating and the pair of second gratings are erected is viewed from the cross-section taken along the arrow Y-Y in FIG. 3. FIG. 6 is a plan view of the shaft protection fence according to the embodiment, in which the first grating and the pair of second gratings are erected.

(overall structure)
1 to 6, a shaft protection fence (hereinafter abbreviated as a protection fence) 10 according to an embodiment of the present invention includes a rectangular first grating 1 and a pair of rectangular second gratings 2 and 2. I have. Further, the protective fence 10 includes a pair of connecting tools 3 and 3 that connect the first grating 1 and the pair of second gratings 2 and 2 to each other. Further, the protective fence 10 includes a chain 4 that spans a pair of second gratings 2 and 2.

  Referring to FIG. 2 or FIG. 4, the first grating 1 normally closes the opening 90 of the shaft 9 (see FIG. 4). The first grating 1 is rotatably connected to a bracket 91 disposed on one side of the pair of first sides of the opening 90.

  Referring to FIG. 4, one end of the first grating 1 is rotatably connected to the bracket 91 via a flat hinge 91h. The other end of the first grating 1 is placed on the bracket 93. The other end portion of the first grating 1 can be grasped and opened, and can stand on one side of the pair of first side edges of the opening 90 as shown in FIG.

  Referring to FIG. 3 or FIG. 4, the pair of second gratings 2 and 2 are usually housed inside the shaft 9. The pair of second gratings 2 and 2 are arranged so as to be able to appear and retract along the inner walls 9w and 9w that are connected to the pair of second sides that are substantially orthogonal to the pair of first sides (see FIG. 5). Moreover, the 2nd grating 2 can hold | grip the handle 2n and can pull up from the inside of the shaft 9 (refer FIG. 1 or FIG. 3). Then, the pair of second gratings 2 and 2 can be erected on the pair of brackets 92a and 92b disposed on the pair of second sides of the opening 90 (see FIG. 5). In addition, the structure of the connection mechanism of the 2nd grating 2 is mentioned later.

  Referring to FIG. 4 or FIG. 5, in a state where the first grating 1 closes the opening 90, the pair of second gratings 2 and 2 are accommodated inside the shaft 9. In this case, the surface of the first grating 1 is, for example, flush with the ground G. That is, the pair of brackets 92 a and 92 b and the bracket 93 are provided with a level difference of about the thickness of the first grating 1. A person or vehicle can pass on the first grating 1 without being obstructed by the pair of second gratings 2.

  Next, the configuration of the protective fence 10 according to the embodiment will be described. FIG. 7 is an exploded perspective view showing a configuration of a second grating connecting mechanism provided in the shaft protection fence according to the embodiment. FIG. 8A is a left side view of one of the second gratings, a state diagram in which the bottom surface of the second grating is in contact with the step of the shaft, and FIG. FIG. 8 is a left side view of the grating, a state diagram in which the bottom surface of the second grating is separated from the step of the shaft, and FIG. 8C is a right side view of FIG. 8B.

(Composition of connector)
With reference to FIG. 1 or FIG. 3 and FIG. 6 or FIG. 7, the connector 3 includes a hook member 31, a rotation shaft 32, and a rotation knob 33. The hook member 31 is rotatably held in a slit groove 2 s formed in the upper corner of the second grating 2. The rotating shaft 32 is fixed to the proximal end portion of the hook member 31. The rotating shaft 32 is supported on both axes by a sealing plate 32b that closes the opening provided in the second grating 2 from both sides (see FIG. 1). The rotary knob 33 is connected to the rotary shaft 32 and protrudes from one surface of the second grating 2.

  Referring to FIG. 1 or FIG. 7, the hook member 31 is provided with a flange 31a at the tip. As shown in FIG. 1 or FIG. 7, when the rotary knob 33 is rotated in one direction with one side surface of the second grating 2 in contact with one side surface of the first grating 1, the flange portion 31 a is 1 Grating 1 can be engaged. When the rotary knob 33 is rotated in the other direction, the hook portion 31a can be released from the first grating 1, and the hook member 31 is accommodated inside the slit groove 2s so that the hook member 31 does not protrude from the upper surface of the second grating 2. it can.

(Chain structure)
Referring to FIG. 1, the chain 4 is a chain of annular bodies. On the other hand, the 2nd grating 2 has the projection part 2b which can anchor the edge part of the chain 4. FIG. As shown in FIG. 1, in a state where the pair of second gratings 2 and 2 are erected and opposed to each other, the chain 4 can be bridged between the pair of protrusions 2 b and 2 b, thereby preventing outsiders from entering. it can. It is preferable to hang a tag 4f indicating that entry is prohibited at the center of the chain 4.

(Configuration of second grating coupling mechanism)
Next, the structure of the connection mechanism of the second grating 2 will be described. Referring to FIG. 7 or FIG. 8, the guard fence 10 according to the embodiment includes a pair of opposed rotating arms 5 and 5. These rotating arms 5 and 5 have connecting pins 5p connected to both side surfaces of the second grating 2 so as to be rotatable and slidable at the tip portion.

  Referring to FIG. 7 or FIG. 8, the guard fence 10 according to the embodiment further includes a pair of bearing blocks 6 and 6 arranged to face each other. These bearing blocks 6 and 6 are fixed to both end portions of the pair of brackets 92a and 92b from the bottom surface side. Further, the pair of bearing blocks 6 and 6 project bearing pins 6p and 6p in opposite directions.

  On the other hand, referring to FIG. 7, the rotating arm 5 has a hole 5 h fitted into the bearing pin 6 p at the base end. The bearing pin 6p is inserted into the hole 5h, and the base end portion of the rotating arm 5 is rotatably held by the bearing block 6. That is, the base end portion of the rotating arm 5 is rotatably supported by the upper end portion of the second side of the opening 90.

  Referring to FIG. 1 or FIG. 7 and FIG. 8, the second grating 2 has elongated holes 2h on both sides for guiding the connecting pin 5p and extending from the upper end to the lower end. As shown in FIG. 8B, when the connecting pin 5p is locked to the upper end side of the long hole 2h, the second grating 2 can be suspended (see FIG. 4).

  On the other hand, referring to FIG. 8, when the second grating 2 is lifted and moved outward, the second grating can be placed on the bracket 92a or the bracket 92b in an upright state. That is, the second grating can be placed on the upper end of the second side of the opening 90 in an upright state. With reference to FIG. 8A, when the second grating 2 is pulled up and moved inward, the second grating 2 can be suspended by the pair of rotating arms 5 and 5 as shown in FIG.

  With reference to FIG. 7, the second grating 2 can be moved toward the first grating 1 in a state where the second grating 2 stands on the bracket 92 a or the bracket 92 b. Further, the second grating 2 can be moved away from the first grating 1. In this way, the pair of rotating arms 5 and 5 are arranged with a predetermined interval between the second gratings 2.

[Operation of protective fence for shafts]
Next, the operation and effect of the protection fence 10 will be described while explaining the protection method of the protection fence 10 according to the embodiment.

  FIG. 9 is a schematic view showing the procedure of the protection method for the shaft protection fence according to the embodiment, wherein the upper part shows a plan view, the lower part shows a longitudinal sectional view, and FIG. 9A shows the first grating. 9B is a state diagram in which the other second grating is erected, FIG. 9C is a state diagram in which one second grating is erected, and FIG. 9D. These are the state diagrams which spanned the chain between a pair of 2nd gratings.

  First, as shown in FIG. 9A, the first grating 1 is opened and stood up. Next, as shown in FIG. 9B, the other second grating 2 is pulled up to stand. Next, the other second grating 2 is moved toward the first grating 1 and engaged with the first grating 1 using the connector 3. Next, as shown in FIG. 9C, one of the second gratings 2 is pulled up to stand. Next, one second grating 2 is moved toward the first grating 1 and engaged with the first grating 1 using the connector 3.

  As a result, as shown in FIG. 9D, the pair of first gratings 1 and the pair of second gratings 2 and 2 are connected to each other and prevented from tilting. Then, as shown in FIG. 9 (D), the chain 4 is bridged between the pair of second gratings 2 and 2 to complete a series of operations. As shown in FIG. 1 or FIG. 9 (D), it is preferable to hang a tag 4f indicating that entry is prohibited from the chain 4.

  Referring to FIG. 1, the guard fence 10 according to the embodiment opens and stands the first grating 1 that closes the opening 90 of the shaft 9, and raises the pair of second gratings 2 from the inside of the shaft 9. By projecting so as to stand upright at the opening 90 and connecting the second gratings 2 and 2 to the first grating 1, three sides of the opening 90 of the shaft 9 can be protected. By passing the chain 4 between the pair of second gratings 2 and 2 on the other opened part, it is possible to reliably prevent an outsider from entering.

  In addition, referring to FIG. 1, when an operator enters the shaft 9, it is preferable that the chain 4 provided on the other opened portion is once removed and entered into the shaft 9, and then the chain 4 is bridged. The protection fence 10 according to the embodiment can easily enter and exit the shaft because one side frame does not fall outward as in the conventional case.

  Referring to FIG. 3 or FIG. 6, the shaft 9 is provided with a trap 9t that allows an operator to move up and down. The trap 9t is installed on an inner wall extending downward from the other side of the pair of first side edges of the opening 90. The worker can descend to the shaft 9 through the trap 9t. In addition, the worker can go up the shaft 9 through the trap 9t.

The following effects can be expected from the protective fence 10 according to the embodiment.
(1) Measures for preventing entry into the shaft 9 can be quickly implemented.
(2) By protecting the three sides of the opening 90 of the shaft 9 with grating, it is possible to prevent small items from falling into the shaft 9.
(3) It is not necessary to prepare a separate safety measure tool, and the safety measure can be implemented by the procedure for assembling the protective fence 10.
(4) Since the shaft 9t is installed on the inner wall of the open side that is not surrounded by the grating, the shaft 9 can be easily moved up and down.

  With reference to FIG. 1 or FIG. 9, the chain 4 may be a metal chain in which stainless rings or the like are chained, or may be a plastic chain in which hard plastic rings are chained. Further, instead of the chain 4, a rope or a string can be used.

  Referring to FIGS. 1 to 9, the first grating 1 and the second grating 2 are preferably formed of aluminum, and the second grating 2 is more preferably formed of engineering plastic or the like.

  Although the protection fence for shafts according to the present invention has been described as being suitable for shafts drilled in the ground, it is not limited thereto. The protection fence for a shaft according to the present invention can be applied to a shaft that is drilled in a building.

DESCRIPTION OF SYMBOLS 1 1st grating 2 2nd grating 3 coupling tool 4 chain 9 shaft 10 guard fence (guard fence for shaft)
90 opening

Claims (6)

A protective fence for the shaft that surrounds the rectangular opening of the shaft that is drilled substantially vertically,
A rectangular first grating that can stand up and closes the opening and is rotatably connected to one side of a pair of first sides of the opening;
A pair of rectangular second gratings that are arranged so as to be able to project and retract along inner walls connected to a pair of second sides that are substantially orthogonal to the pair of first sides, and that can stand up by protruding from the openings;
A pair of connectors for connecting the first grating and the pair of second gratings to each other so that the first grating and the pair of second gratings are in an upright state;
A guard fence for a mine shaft comprising: a chain that spans a pair of the second gratings and blocks a person from entering so as to be positioned on the other side of the pair of first side edges of the opening. A pair of opposingly arranged pins having a connecting pin rotatably and slidably connected to both side surfaces of the second grating at the distal end and a base end rotatably supported by the upper end of the second side. A pivot arm;
The second grating guides the connecting pin and has elongated holes on both sides from the upper end to the lower end,
From the state in which the connecting pin is locked to the upper end side of the elongated hole and the second grating is suspended, when the second grating is lifted and moved outward, the second grating can be placed in an upright state. The protective fence for a pit shaft according to claim 1, wherein a step is provided at the upper end of the second side.   In a state where the second grating stands up at the step, the pair of rotating arms is provided with a predetermined interval between the second grating so that the second grating can move toward the first grating. The protective fence for shafts according to claim 2, which is arranged. The connector is
A hook member rotatably held in a slit groove formed in an upper corner of the second grating;
A pivot shaft fixed to the proximal end of the hook member;
A rotation knob connected to the rotation shaft and projecting from one surface of the second grating;
4. The shaft protection fence according to claim 1, wherein the hook member is provided with a brim portion at a distal end portion that engages with the first grating when the rotary knob is rotated in one direction. 5.   The said 2nd grating is a protection fence for shafts in any one of Claim 1 to 4 which has the projection part which can anchor the edge part of the said chain. A protection method for a shaft protection fence that surrounds a rectangular opening of a shaft that has been drilled substantially vertically, and closes the opening and is rotatable with one side of a pair of first side edges of the opening A pair of upstanding rectangular first gratings to be connected and a pair of standing uprights protruding along the inner walls connected to the pair of second sides substantially perpendicular to the pair of first sides and protruding from the openings. A pair of couplers that mutually connect the first grating and the pair of second gratings so that the first grating and the pair of second gratings are in an upright state, In the protective fence for shafts provided with a chain that is bridged between the pair of second gratings and prevents a person from entering so as to be located on the other side of the pair of first side edges of the opening,
A first step of opening the first grating and raising the first grating to one side of the pair of first sides of the opening;
A second step of causing the pair of second gratings to protrude from the opening and erecting the second grating on the pair of second sides of the opening;
A third step of interconnecting the first grating and the pair of second gratings;
A fourth step of bridging the chain between the pair of second gratings so as to prevent people from entering, so as to be positioned on the other side of the pair of first side edges of the opening. Protection method of the protective fence.

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