JP2017205153A - Fall prevention device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fall prevention device devised to suppress increase in workload and increase of a cost, while reducing a problem such as work difficulty caused by catch of a rope.SOLUTION: A fall prevention device includes: a rewinder 3 attached to a safety belt 8 worn by a worker M and rewinding and feeding a wire W suspended to a slope face S; a connecting device 2 as a wire fixing mechanism fixed to the wire W and having a rotating body 221 and a cylindrical part 211; and a wire-side lanyard 5 for connecting the connecting device 2 and the safety belt 8. The wire-side lanyard 5 has a full length of 2 m or less, is attached to the safety belt 8, and may include a second rewinder 52 for rewinding and feeding a belt-like rope 51.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a crash prevention device for preventing a worker who performs a slope protection work for preventing slope collapse and erosion from falling or falling.

  Slope protection work is carried out by workers in order to prevent collapse and erosion of slopes formed by cutting or embankment in road construction and residential land development. For the slope protection work (hereinafter referred to as slope work), slope cleaning, lath stretching, installation of the frame for the frame, or the installation of the mortar and concrete to the frame for the frame There are various operations such as spraying. Since these slope operations are often performed at high places and steep slopes, the operator is connected to a support provided above the work place with one end fastened to a slope. Work is performed with the body held.

  In addition, when occupational safety and health regulations were revised on August 5, 2015 (enforced on January 1, 2016), when carrying out rope height work such as slope work, A rope other than a rope (hereinafter, sometimes referred to as a main rope) attached to a rope that is tightly suspended from a support attached to the support, and that has a safety belt It was obliged to provide a device for attachment (hereinafter sometimes referred to as a lifeline) (see Article 539-2 of the Industrial Safety and Health Regulations). As a method using this lifeline, there are two types, a rope method and a retractor type fall prevention device method (for example, see Non-Patent Document 1 etc.).

  The former rope method uses a rope similar to the main rope as the lifeline, and connects the lifeline rope to the body belt of the safety belt via a connecting device such as a grip. In this rope system, as with the main rope, the lifeline rope is also hung from the support to the bottom. For this reason, two ropes will be hung on the operator's leg side, and it may be difficult for the two ropes to get caught on the frame for the frame and the like installed on the slope. is there.

  The latter type of retractor-type crash prevention device is a method in which a hook of a retractor-type crash prevention device (hereinafter referred to as a safety block) is connected to a waist belt of a safety belt (for example, Patent Document 1 and Patent Reference 2 etc.). With this retractor type fall prevention device method, a safety block is attached to a handrail with sufficient strength installed on the shoulder, and a wire hook as a lifeline drawn out from this safety block is connected to the waist belt of the safety belt To do. The wire is wound around the safety block or drawn out from the safety block in accordance with the movement of the operator to move up and down the slope, so that only one main rope is suspended from the operator to the slope side. . For this reason, as compared with the rope method, the problem that the rope suspended from the operator on the heel side is caught on the frame for the frame and the work becomes difficult is greatly reduced.

Special Education Text for Working on Rope Rope Height October 2015 General Slope Protection Association of Japan P7 ~ P8

JP 2012-152316 A JP 2010-154885 A

  However, the safety block requires a function of winding and feeding out the lifeline, as well as a function of locking and preventing the crash when the operator crashes, and it tends to be heavy and large. For this reason, the work burden may increase. Furthermore, the safety block itself is expensive, and periodic inspections and inspections when a large load is applied even once are required, resulting in an increase in costs.

  In view of the above circumstances, an object of the present invention is to provide a crash prevention device that is devised to suppress an increase in work load and an increase in cost while reducing problems such as difficulty of work due to rope catching.

The fall prevention device of the present invention that solves the above-described object is a winder that winds and feeds a wire that is attached to a safety belt worn by an operator and suspended on a slope.
A connecting device having a wire fixing mechanism for fixing to the wire;
It is provided with the lanyard which connects the said connecting instrument and the said safety belt.

  Here, the winder winds the wire from the rear end of the wire. The winding machine may continue to apply tension in the winding direction to the wire.

  If the fall prevention device of the present invention is applied to the wire suspended from the slope as a lifeline separately from the main rope, the wire is wound by the winder so that the wire is No more hanging down. As a result, as with the retractor-type crash prevention device method, for example, the one that is suspended from the operator to the buttock side becomes one main rope, and it becomes difficult to work by being hooked on the framing frame or the like. Can be greatly reduced. Furthermore, in the fall prevention device of the present invention, the lanyard has a function of preventing the fall of the operator. As a result, the winder eliminates the need for a function to prevent the operator from falling, and is cheaper, lighter and smaller than the safety block having the function of locking and preventing the operator from falling. can do. For this reason, increase in work burden and increase in cost can be suppressed.

In the fall prevention device of the present invention, the lanyard has a total length of 2 m or less,
It is good also as a structure provided with the 2nd winder which is attached to the said safety belt | band | zone and winds and unwinds the said lanyard.

  Here, the lanyard may be a synthetic fiber belt or a wire. Further, the second winder may have a stop mechanism that stops the feeding when the lanyard is fed out at a predetermined speed or higher. Further, the second winder may have a shock absorber mechanism that absorbs an impact when the lanyard feeding is stopped.

  As the lanyard, a so-called curled cord wire that can be expanded and contracted can be used. In the embodiment using the curled cord wire, the second winder is not necessary.

  Furthermore, in the fall prevention device of the present invention, it is also one of preferred embodiments that the connecting device has a rope fixing mechanism for fixing to the rope suspended on the slope.

  By carrying out like this, the said connecting instrument can be fixed to both the said rope as a main rope, and the said wire as a lifeline.

  Here, the wire fixing mechanism has an operation unit that operates a releasing operation of fixing the wire, and the rope fixing mechanism operates the operation unit to fix the wire and fix the rope. Both of these may be canceled. The wire fixing mechanism includes an operation unit that operates the wire fixing release operation, and the rope fixing mechanism includes a second operation unit that operates the rope fixing release operation. Yes, the operation unit and the second operation unit may be operated together with one hand.

Still further, in the fall prevention device of the present invention, the wire fixing mechanism includes:
A roller disposed rotatably and wound with the wire;
In another preferred embodiment, the wire has a stopper that prevents the roller from rotating in a direction in which the wire is drawn from the roller to the side opposite to the safety belt side.

  If the wire fixing mechanism or the like includes the roller around which the wire is wound and a stopper that prevents the rotation of the roller, the wire can be prevented from being crushed.

  Here, the roller may rotate about a rotation axis extending in a direction orthogonal to the slope with respect to the extending direction of the wire. Further, in the case of the aspect having the roller, a stopper for preventing the rotation of the roller in the direction in which the wire is fed out from the roller to the side opposite to the safety belt side is essential. The rotation in the direction in which the wire is drawn out from the roller toward the safety belt may be allowed or prevented. Furthermore, the stopper may be provided with a stopper operating portion, and the rotation prevention of the roller may be released when the stopper operating portion is operated.

  According to the fall prevention device of the present invention, it is possible to provide a fall prevention device that has been devised to reduce an increase in work load and an increase in cost while reducing problems such as difficulty in working due to rope catching.

It is a perspective view which shows notionally a mode that a spraying process is performed using the fall prevention apparatus which is one Embodiment of this invention. It is the figure which looked at the worker M who implements a spraying process using the fall prevention apparatus which is one Embodiment of this invention from upper direction. FIG. 3 is a diagram showing the structure of a safety belt 8. (A) shows the state which grips a rope with the grip shown in FIG. 2, (b) is a figure which shows the state from which the grip of the rope by a grip was cancelled | released. It is a figure which shows a mode that the wire side lanyard shown in FIG. 2 expands and contracts. It is a figure which shows the modification of a wire side lanyard. It is a figure which shows roughly the internal structure of the winder shown in FIG. (A) is a figure which expands and shows the connection instrument shown in FIG. (B) And (c) is a figure which shows notionally the rotation to the blocked | prevented direction of the winding roller shown to (a), and the rotation to the permitted direction. It is the sectional view on the AA line of Fig.8 (a). (A) And (b) is a figure corresponding to Drawing 8 (b) and the same figure (c) in a connecting implement of the 1st modification, (c) and (d) are the 1st modification. FIG. 10 is a diagram corresponding to FIG. 9A and FIG. (A) And (b) corresponds to FIG. 8 (b) and FIG. 8 (c) in the connecting device of the second modified example, and conceptually shows the case where rotation of the winding roller is prevented and allowed. FIG. (C) And (d) is a figure corresponding to Drawing 9 (a) and the figure (b) in the connecting instrument of the 2nd modification. (A) And (b) is a figure corresponding to Drawing 11 (a) and the figure (b) in a connecting implement of the 3rd modification, (c) and (d) are the 3rd modification. It is a figure in the connection instrument 2 corresponding to FIG.11 (c) and the same figure (d). It is the figure which looked at the worker M who implements a spraying process using the fall prevention apparatus of 2nd Embodiment from upper direction.

  Embodiments of the present invention will be described below with reference to the drawings.

  The fall prevention device of the present invention includes felling, mowing, ground excavation, shaping for cutting and embankment, slope cleaning, lath tensioning, installation of frame for formwork, rebar insertion work, turf turf work, vegetation mat work, installation It can be used for slope work such as spraying of mortar and concrete to the formed formwork for the frame and suspending the mortar and concrete surface. In the following description, a mode used when spraying mortar (hereinafter referred to as a spraying process) onto a formwork mold placed on a slope will be described as an example.

  FIG. 1 is a perspective view conceptually showing a state where a spraying process is performed using a fall prevention device according to an embodiment of the present invention. In FIG. 1, a part of the slope S is shown, and a frame for a frame 92 is installed on a wire lath 91 stretched over the plane S, and an operator M is placed on the frame for a frame 92. A mode frame 90 is formed by spraying mortar. In FIG. 1, the upper left side is the shoulder side that is the upper side of the slope S, and the lower right side is the slope side that is the lower side of the slope S. Hereinafter, the direction will be described with reference to the shoulder side and the buttocks side in FIG. In addition, the direction intersecting with the direction connecting the shoulder and the butt is sometimes referred to as the width direction.

  As shown in FIG. 1, on the slope S, a rope R as a main rope and a wire W as a lifeline are suspended. The worker M performs work while the body is held by the rope R. If the rope R is cut or unraveled, the worker M falls by being held by the wire W. Is prevented. A handrail 93 is provided on the shoulder, and a protective roller 931 for preventing wear of the rope R and the wire W is provided on the handrail 93. The rope R and the wire W are wound around a protective roller 931 and the upper end portion is fastened to a support such as a standing tree or an anchor bar (not shown). The rope R suspended from the slope S is suspended from the worker M to the slope side, and the wire W is attached to the safety belt 8 of the worker M as will be described in detail later. The winder 3 is wound up (see FIG. 2).

  FIG. 1 shows a state where three workers M each holding a body by the rope R work side by side in the width direction. The worker M on the left side holds the supply hose H indicated by the alternate long and short dash line over his shoulder, and mortar discharged from the supply hose H is sprayed onto the method frame 92 to form the method frame 90. The worker M holding the supply hose H sprays the mortar, then passes the supply hose H to the next worker M, and the worker M who receives the supply hose H sprays the mortar. The frame 90 is formed in the width direction while repeating, and the spraying process is carried out while gradually descending toward the side of the method. Here, when the rope R or the wire W comes into contact with the method frame 90 sprayed with mortar, the sprayed mortar is broken. For this reason, the worker M is required to carry out the spraying process while maintaining the state in which the rope R and the wire W are stretched so that the rope R and the wire W do not hang down and come into contact with the method frame 90. In addition, although the aspect which supplies the supply hose H from the method bottom side is employ | adopted in FIG. 1, you may employ | adopt the aspect which supplies the supply hose H from the method shoulder side.

  FIG. 2 is a view of an operator M who performs a spraying process using the fall prevention device 1 according to an embodiment of the present invention as viewed from above. In FIG. 2, in order to simplify the drawing, the frame 90, the wire lath 91 and the frame 92 for the frame provided on the slope S shown in FIG. 1 are omitted. The body and head are shown conceptually. In FIG. 2, the upper side of the paper is the shoulder side, and the lower side of the paper is the law side.

  As shown in FIG. 2, a grip 6 is attached to the rope R, and a connection tool 2 of the fall prevention device 1 of the present invention is attached to the wire W. The rope R has a function of a main rope (master rope), and has a length that reaches the law bottom while being suspended on the slope S. In this embodiment, the rope R has a diameter of 18 mm. A striking rope is used. The wire W has a function of a lifeline that ensures the safety of the worker M when the main rope is cut or unwound. For example, the wire W has a length of 15 to 50 m and a diameter of 3 to 3 mm. The thing of about 4 mm is adopted.

  A safety belt 8 is attached to the waist of the worker M, and the grip 6 and the safety belt 8 are connected by two rope-side lanyards 7. Further, the wire W is wound around a winder 3 attached to the safety belt 8, and the connecting device 2 and the safety belt 8 are connected by the wire side lanyard 5.

  FIG. 3 is a diagram showing the structure of the safety belt 8. In the state shown in FIG. 3, the back side of the safety belt 8 is the side on which the worker M is attached.

  As shown in FIG. 3, the safety belt 8 includes a waist belt 81, a backside belt 82, and a pair of suspension belts 83 and 83. The waist belt 81 is wound around the position of the hip bone of the worker M, and a D ring 811 to which the winder 3 and the wire side lanyard 5 (see FIG. 2) are attached is provided. The D ring 811 is provided slightly to the left of the waist belt 81 in FIG. 3 and is located near the left waist of the worker M wearing the safety belt 8. Further, the D ring 811 can move the position of the waist belt 81. For example, when the worker M is left-handed, the D-ring 811 may be moved so as to be positioned near the right waist of the worker M.

  The backside belt 82 covers the buttocks and thighs of the worker M, and work D-rings 821 to which the rope-side lanyards 7 (see FIG. 2) are attached are provided on both sides in the width direction.

  As shown in FIG. 2, each of the two rope-side lanyards 7 includes a lanyard rope 71 having a slightly smaller diameter than the rope R, a connection fitting 72 provided on one end side of the lanyard rope 71, and the other end of the lanyard rope 71. And a hook 73 provided on the side. Each of the rope-side lanyards 7 is connected to a connection fitting 72 to a connection ring 64 of the grip 6, which will be described in detail later, and a hook 73 is attached to a work D-ring 821 of the safety belt 8. When the operator M puts his / her weight on the buttock side, the connecting ring 64 of the grip 6 is pulled to the buttock side by the two rope-side lanyards 7.

  4A shows a state in which the rope R is gripped by the grip 6 shown in FIG. 2, and FIG. 4B shows a state in which the grip of the rope R by the grip 6 is released. In FIG. 4, only one of the two rope-side lanyards 7 is shown to simplify the drawing.

  As shown in FIGS. 2 and 4, the grip 6 has a main body pipe portion 61, a grip rod 62, and the connecting ring 64 described above, and, as shown in FIG. It has a pair of claw members 63 and 63 for connecting the grip grip 62.

  The main body pipe portion 61 is configured to be freely opened and closed, and is attached to the rope R in a state where the rope R is sandwiched by inserting the rope R in an open state and closing the rope R. A claw 631 is formed at a portion of the claw member 63 that contacts the rope R. Further, the main body pipe portion 61 and the pair of claw members 63 and 63 are rotatably connected, and the pair of claw members 63 and 63 and the grip rod 62 are also rotatably connected, thereby constituting a four-bar linkage mechanism. ing.

  FIG. 4 (a) shows that the operator M shown in FIG. 2 puts his / her weight on the buttock side and, as indicated by the arrow, the gripping rod 62 and a pair of claws by the rope side lanyard 7 attached to the connecting ring 64. A state in which the member 63 is pulled to the buttock side is shown. When the gripping rod 62 and the pair of claw members 63 are pulled to the buttock side, the push claw 631 of the claw member 63 tightens the rope R by the four-bar linkage mechanism, and the grip 6 is firmly fixed to the rope R. Accordingly, the operator M is held on the rope R via the grip 6, the rope side lanyard 7 and the safety belt 8. That is, the grip rod 62 and the pair of claw members 63 correspond to an example of a rope fixing mechanism.

  On the other hand, when the worker M moves up and down the slope, for example, the worker M grips the portion of the rope R on the shoulder side of the rope R from the portion held by the grip 6 with the right hand, and the load applied to the slope side. Is released. Then, the grip 6 is grasped with, for example, the left hand, and the gripping rod 62 is pushed to the shoulder side as indicated by the arrow in FIG. Thereby, the push nail 631 is in a state of floating from the rope R, the fixation of the grip 6 to the rope R is released, and the worker M can move up and down the slope.

  FIG. 5 is a diagram showing step by step how the wire side lanyard 5 shown in FIG. 2 expands and contracts. In FIG. 5, the upper left side is the shoulder side and the lower right side is the shoulder side.

  As shown in FIGS. 2 and 5, the wire-side lanyard 5 includes a strip-shaped rope 51, a safety hook 53 attached to one end of the strip-shaped rope 51, and a second winding that winds the strip-shaped rope 51 from the other end. A machine 52, an attachment hook 54 attached to the second winder 52, and an impact buffer member 55.

  The belt-like rope 51 uses, for example, a high-strength fiber such as an aramid fiber as a core material. In the present embodiment, the total length is set to about 1.5 m. In addition, the belt-like rope 51 has a portion (for example, about 50 cm) on one end side to which the safety hook 53 is attached folded in a folded manner, and the folded portion is held by an impact buffer member 55.

  The second winder 52 winds the belt-like rope 51 from the other end side, and feeds the wound belt-like rope 51. The winding roller (not shown) and the roller (not shown) that rotates the winding roller are unillustrated. A spring spring is built-in. The mainspring spring biases the winding roller in the direction in which the belt-like rope 51 is wound, so that the belt-like rope 51 is wound around the second winder 52 without slack. On the other hand, when the force against the urging force of the mainspring spring becomes strong, the belt-like rope 51 is fed out from the second winder 52. The second winder 52 has a lock mechanism that locks the rotation of the winding roller by operating an operation unit (not shown), and an emergency that locks the rotation of the winding roller when the belt-like rope 51 is rapidly drawn out. A locking mechanism is provided. Note that the emergency lock mechanism may be omitted for weight reduction and the like.

  As shown in FIG. 2, the safety hook 53 of the wire-side lanyard 5 is connected to a connecting ring 23 of the connecting device 2 described in detail later, and the mounting hook 54 is attached to the D ring 811 of the safety belt 8. Yes.

  FIG. 5A shows a state in which the belt-like rope 51 is wound around the second winder 52 except for a portion held by the shock absorbing member 55, and FIG. A state in which the belt-like rope 51 is all drawn out from the second winder 52 is shown. In the state shown in FIG. 5B, when the connection tool 2 is fixed to the wire W, the worker M is held on the wire W through the connection tool 2, the wire-side lanyard 5, and the safety belt 8.

  Further, as will be described in detail later, the winder 3 shown in FIG. 2 is capable of winding and unwinding the wire W, so that the connecting device 2 is coupled to the connecting device 2 when the connecting device 2 is fixed to the wire W. The belt-like rope 51 of the wire-side lanyard 5 is wound around the second winder 52 following the movement of the worker M between the state shown in FIG. 5A and the state shown in FIG. And is fed out from the second winder 52.

  Furthermore, when the rope R is cut off and the belt-like rope 51 is rapidly fed out from the second winder 52, the emergency lock mechanism stops the feeding of the belt-like rope 51, and FIG. 5 (c). As shown in FIG. 2, the shock absorbing member 55 is divided into two parts and removed, and the folded portion of the belt-like rope 51 is extended. Thereby, the impact load generated when the worker M is held through the belt-like rope 51 and the safety belt 8 can be reduced.

  Note that the wire-side lanyard 5 is set to have a total length of 2 m or less in the longest state shown in FIG. 5C in which the belt-like rope 51 is all unwound from the second winder 52 and the folded portion is also extended. ing. As a result, when the rope R is broken or unraveled, the distance by which the worker M falls on the slope before being held by the wire-side lanyard 5 is suppressed to within 2 m, and the impact load applied to the worker M is suppressed. be able to.

  FIG. 6 is a view showing a modification of the wire-side lanyard 5.

  The wire side lanyard 5 of the modification shown in FIG. 6 replaces the belt-like rope 51 of the wire side lanyard 5 shown in FIG. 5 with a telescoping curl cord wire 56 and omits the second winder 52 (see FIG. 5). Then, the other end of the curl cord wire 56 is connected to the attachment hook 54. When the wire-side lanyard 5 of this modification is used, the worker M is allowed to move within a range in which the curl cord wire 56 can be expanded and contracted.

  FIG. 7 is a diagram schematically showing the internal structure of the winder 3 shown in FIG. In FIG. 7, the upper left side is the shoulder side, and the lower right side is the shoulder side.

  As shown in FIG. 7, the winder 3 includes a casing 31, a winding roller 32 built in the casing 31, and an attachment hook 33 attached to the casing 31. The winding roller 32 winds and unwinds the wire W indicated by a one-dot chain line, and is disposed so as to be rotatable around a shaft portion 35 supported by the support frame 34. Further, the winding roller 32 is urged by a spring spring (not shown) in the direction of winding the wire W, which is indicated by an arc-shaped arrow in the drawing, thereby preventing the wire W from being loosened and winding up. Can do.

  Here, since the winder 3 does not need the function of preventing the worker M from falling, which is necessary for the safety block, the winder 3 is less expensive and lighter and smaller than the safety block. can do. For this reason, it can attach to the safety belt | band | zone 8, and can suppress the increase in work burden and the increase in expense. Prioritizing weight reduction, the winding machine 3 of the present embodiment is not provided with a locking mechanism that locks the rotation of the winding roller 32 by operating the operation unit. However, such a locking mechanism is provided. Aspects may be adopted.

  Fig.8 (a) is a figure which expands and shows the connection instrument 2 shown in FIG.

  As shown in FIGS. 2 and 8A, the connection device 2 includes a frame 21, a winding roller 22, and a connecting ring 23 provided on the frame 21. The winding roller 22 is provided on the frame 21 so that the rotating body 221 (see FIG. 9) can rotate. The operation portion 2211 of the rotating body 221 protrudes upward from the frame 21, and the other portions are the frame. 21. The frame 21 is formed in a box shape, and an opening 21a through which the wire W is inserted is formed on the shoulder side and the butt side, respectively. Further, the frame 21 is provided with a cylindrical cylindrical portion 211 that stands up around the winding roller 22. Note that the cylindrical portion 211 is also formed with openings 211a through which the wires W are inserted, on the shoulder side and the butt side, respectively.

  FIG. 8B and FIG. 8C conceptually illustrate the rotation of the winding roller 22 shown in FIG. 8A in the blocked direction and the permitted direction. In FIGS. 8B and 8C, the upper side is the shoulder side and the lower side is the tail side. FIG. 9 is a cross-sectional view taken along the line AA in FIG. 8A, and FIG. 9A shows a state where the rotation of the winding roller 22 in the direction shown in FIG. FIG. 8B shows a state where the operation is performed from the state in which the rotation of the winding roller 22 in the direction shown in FIG. In FIG. 9, the winding roller 22 and the wire W wound around the winding roller 22 are shown without a cross section in order to clarify the state in which the wire W is wound. In FIG. 9, the left side is the shoulder side, and the right side is the shoulder side.

  As shown in FIG. 9A and FIG. 9B, the winding roller 22 includes a rotating body 221, a shaft body 222, and a coil spring 223. The shaft body 222 has a fixed flange 2221 fixed to the bottom of the frame 21 and a columnar shaft portion 2222 erected from the fixed flange 2221. The rotating body 221 has a flange portion 2215 on the bottom side and is formed hollow inside, and the shaft portion 2222 of the shaft body 222 is inserted into the hollow rotating body 221. A coil spring 223 is disposed between the fixed flange 2221 of the shaft body 222 and the flange portion 2215 of the rotating body 221. Accordingly, the rotating body 221 can rotate around the shaft portion 2222 and is biased upward by the coil spring 223.

  The rotating body 221 has a large-diameter portion 2212 having a larger diameter than the operation portion 2211 at the lower portion of the operation portion 2211, and the wire W is wound between the large-diameter portion 2212 and the flange portion 2215. A wound portion 2214 is formed.

  As shown in FIGS. 8B, 8 </ b> C, and 9, the large-diameter portion 2212 is provided with a plurality of locking pieces 2213. As shown in FIG. 8B and FIG. 8C, each of these locking pieces 2213 gradually increases in thickness counterclockwise, and has a locking portion 2213a at the thickest tip portion. Yes. The locking piece 2213 is stored in a storage recess 2212a formed in the large-diameter portion 2212 with the shaft 2212c provided at the rear end portion as a rotation center, and outward from the outer peripheral portion of the large-diameter portion 2212. It is rotatably provided in a protruding state, and is biased by a spring 2212b in a direction protruding outward from the outer peripheral portion of the large diameter portion 2212. Hereinafter, a state in which the locking piece 2213 is stored in the storage recess 2212a may be referred to as a stored state, and a state in which the locking piece 2213 protrudes from the large diameter portion 2212 may be referred to as a protruding state.

  Locking pieces 2111 that protrude from the inner peripheral portion toward the center are formed in the cylindrical portion 211 at intervals of approximately 90 degrees. The locking piece 2111 is set so that the length protruding from the inner peripheral portion of the cylindrical portion 211 does not contact the outer peripheral portion of the large-diameter portion 2212, and as shown in FIG. It is provided in the part.

  As shown in FIG. 9, the wire W is wound around the winding portion 2214. Although not particularly limited, in this embodiment, the wire W is wound twice around the winding portion 2214, and thereby the winding portion 2214 is fixed to a predetermined portion of the wire W. Moreover, if the rotating body 221 rotates in the direction which pays out the wire W from the winding part 2214 to the shoulder side (the side opposite to the safety belt 8 shown in FIG. 2), the connecting device 2 is relative to the wire W. Therefore, it moves to the slope side (corresponding to the direction in which the worker M descends the slope). On the other hand, if the rotating body 221 rotates in the direction in which the wire W is fed from the winding portion 2214 to the buttock side (the safety belt 8 side shown in FIG. It moves to the shoulder side (corresponding to the direction in which worker M ascends the slope).

  Here, when the fixing mechanism of the aspect fastened by the claw member 63 described above with reference to FIG. 4 is adopted for the wire W, the wire W may be crushed. In this embodiment, since the aspect which winds and fixes the wire W around the winding part 2214 is employ | adopted, the malfunction that the wire W will be crushed can be avoided. The rotating body 221 rotates around a shaft portion 2222 that extends in a direction orthogonal to the slope with respect to the extending direction of the wire W. For this reason, the wire W wound around the winding portion 2214 is less likely to swing left and right, and the wire W can be stabilized.

  As described above, since the rotating body 221 is biased upward by the coil spring 223, the upper end portion of the large-diameter portion 2212 contacts the ceiling portion of the frame 21 as shown in FIG. In contact with each other, the locking piece 2111 of the cylindrical portion 211 and the locking piece 2213 of the large-diameter portion 2212 overlap each other in the horizontal direction (the direction orthogonal to the paper surface of FIG. 9).

  FIG. 8B shows the shoulder side (in FIG. 2) from the winding portion 2214 in the state shown in FIG. 9A, as indicated by the arc-shaped arrow (counterclockwise direction) of the rotating body 221. A state in which the rotating body 221 rotates in a direction in which the wire W is fed out to the side opposite to the safety belt 8 shown (corresponding to a direction when the worker M gets off the slope) is shown. When the rotating body 221 rotates counterclockwise, the locking portion 2213a of the locking piece 2213 in the protruding state comes into contact with the locking piece 2111 of the cylindrical portion 211, and the rotation of the rotating body 221 is prevented. As a result, the connection tool 2 is prevented from moving toward the bottom edge with respect to the wire W. That is, the rotating body 221 and the cylindrical portion 211 correspond to an example of a wire fixing mechanism, the winding roller 22 corresponds to an example of a roller, and the locking piece 2111 of the cylindrical portion 211 corresponds to an example of a stopper.

  Here, when the movement of the connecting device 2 to the legal bottom side is prevented with respect to the wire W, the method of the operator M is within a range in which the wire-side lanyard 5 connected to the connecting ring 23 of the connecting device 2 expands and contracts. Movement to the bottom side is restricted. Also, in the unlikely event that the rope R is cut, the wire lanyard 5 connected to the connecting ring 23 of the connecting device 2 can prevent the worker M from falling.

  In FIG. 8C, the rotating direction of the rotating body 221 is indicated by an arcuate arrow (clockwise), and in the state shown in FIG. 9A, from the winding portion 2214 (shown in FIG. 2). A state in which the rotating body 221 rotates in the direction in which the wire W is fed out to the safety belt 8 side (corresponding to the direction when the worker M ascends the slope) is shown. When the rotating body 221 rotates in the clockwise direction, the locking piece 2213 in the protruding state is pushed by the locking piece 2111 of the cylindrical portion 211 to be in the retracted state. For this reason, rotation of the rotating body 221 is allowed. Thereby, for example, when the worker M ascends the slope, the wire W is wound up by the winder 3 shown in FIG. 7, whereby the rotating body 221 rotates clockwise, and the winding unit 2214 The wire W is wound up from the shoulder side. As a result, the position of the connection tool 2 with respect to the wire W also moves to the shoulder side, and the drooping of the wire W can be prevented.

  On the other hand, in order to release the state where the movement of the connecting device 2 to the buttock side shown in FIG. 8B is blocked, the operation unit 2211 is attached to the frame 21 as shown by an arrow in FIG. Push in. Thereby, in the horizontal direction (direction orthogonal to the paper surface of FIG. 9), the rotating body 221 moves so that the locking piece 2213 of the large-diameter portion 2212 does not overlap the locking piece 2111 of the cylindrical portion 211. . As a result, the rotation of the rotating body 221 in the counterclockwise direction is allowed, and the connection tool 2 can be moved to the slope side with respect to the wire W, and the worker M can get off the slope.

  In this embodiment, four locking pieces 2213 and four locking pieces 2111 are provided. However, the number of locking pieces 2213 and the locking pieces 2111 may be three or less, or five or more. May be. In addition, for example, a mode in which the number of the locking pieces 2213 and the locking pieces 2111 is different, such as providing one locking piece 2213 and providing four locking pieces 2111 may be adopted.

  Then, an example of the spraying process which the worker M shown in FIG. 2 performs is demonstrated.

  As described above, the worker M puts his / her weight on the buttock side, so that the body is held on the rope R via the grip 6, the rope-side lanyard 7 and the safety belt 8. In this state, the rope R is in a tensioned state, and the problem that the rope R is loosened and the mortar collapses can be avoided.

  Moreover, tension | tensile_strength is provided by the wire W being wound by the winder 3, and the slack of the part between the winder 3 and the connection instrument 2 is prevented. Furthermore, as shown in FIG. 8C, the connecting device 2 rotates from the winding portion 2214 to the buttock side so that the rotating body 221 rotates in the direction in which the wire W is fed, and the wire W extends from the shoulder to the connecting device 2. The slack in the portion can also be suppressed. By these, the malfunction that the wire W droops and destroys the sprayed mortar can be avoided. The wire-side lanyard 5 is also wound around the second winder 52, so that the slack of the belt-like rope 51 is prevented.

  The worker M holds the supply hose H shown in FIG. 1 on the shoulder while being held by the rope R, and sprays mortar from the supply hose H onto the frame for legal frame 92 (see FIG. 1). . Also, the worker M puts his weight on the buttock side, sprays mortar while moving the slope left and right with the body held by the rope R, and when the spraying of a predetermined range is completed, Pass the supply hose H.

  Here, if the sprayed mortar adheres to the wire W or the belt-like rope 51, it may be difficult to wind the winder 3 or the second winder 52. For this reason, it is preferable to attach the cover C to the wire W or the belt-like rope 51 as shown by a one-dot chain line in FIG. As the cover C, for example, it is preferable to employ a polyester cloth that is formed into a cylindrical shape and that can further expand and contract in a bellows shape.

  Subsequently, when the worker M gets off the slope to perform the spraying process on the area on the slope side, first, the right hand holds the portion of the rope R that is located on the shoulder side of the grip 6. Use your right hand to support your weight on the buttocks side. Next, the grip 6 is grasped with the left hand, and as shown by the arrow in FIG. As a result, the push claws 631 are lifted, and the slope 6 is descended with the grip 6 being fixed to the rope R. As the worker M gets off the slope, the wire W and the belt-like rope 51 are fed out from the winder 3 and the second winder 52, respectively, and the connecting device 2 is separated from the worker M. Go. The worker M stops descending as long as he can reach the operation unit 2211 of the connection tool 2, breaks the right hand holding the rope R and the left hand holding the grip 6, and puts weight on the buttock side. Thereby, the grip 6 is fixed to the rope R, and the body of the worker M is returned to the state held by the rope R again.

  Next, as illustrated in FIG. 9B, the operation unit 2211 of the connection tool 2 is pushed toward the frame 21. Thereby, the counterclockwise rotating body 221 shown in FIG. 8B is allowed to rotate, and in this state, the connection tool 2 is moved to the buttock side with respect to the wire W. By performing the above operation, or by repeatedly performing the above operation, the worker M can move down to a desired position and perform the operation of spraying mortar on the next area.

  When the worker M performs the spraying process, the wire W is wound around the winder 3, so that the worker M does not hang down from the worker M side. For this reason, the rope R, or the rope R and the supply hose H, are suspended from the worker M on the heel side, and the problem is that it is difficult to work by being hooked on the frame for the frame. It can be greatly reduced.

  When the worker M shown in FIG. 2 climbs the slope, the right hand holds the portion of the rope R located on the shoulder side of the grip 6 and the weight on the slope side, as in the case of descending the slope. Is held with the right hand, the grip 6 is grasped with the left hand, and the slope is raised while the grip 6 is moved to the shoulder side with the grip 6 being fixed to the rope R. At this time, it is necessary to ascend the slope with caution while pulling the rope R with the right hand so that the rope R does not come into contact with the mortar sprayed.

  On the other hand, in the connection tool 2, the rotating body 221 rotates clockwise as indicated by the arrow in FIG. 8C by winding the wire W by the winder 3. Thereby, the connection tool 2 moves to the shoulder side as the worker M ascends the slope. For this reason, when climbing the slope, the worker M does not need to operate the connection tool 2. In addition, when the force which winds the wire W of the winder 3 is weak, the rotating body 221 may not rotate even if the operator M is climbing the slope. In that case, once the hand is released from the rope R and the grip 6 and the body is held by the rope R, the connecting device 2 may be moved to the shoulder side.

  Next, a modified example of the connection device 2 shown in FIGS. 8 and 9 will be described. In the modified example described below, the difference from the connecting device 2 shown in FIGS. 8 and 9 will be mainly described, and the components having the same names as the names of the components in the connecting device 2 shown in FIGS. Are described with the same reference numerals used so far, and redundant descriptions may be omitted.

  10 (a) and FIG. 10 (b) are views corresponding to FIG. 8 (b) and FIG. 10 (c) in the connection device 2 of the first modified example, and FIG. 10 (c) and FIG. d) It is a figure corresponding to Drawing 9 (a) and the figure (b) in connecting implement 2 of the 1st modification.

  As shown in FIG. 10, the large-diameter portion 2212 is formed in a thin disk shape, and a plurality of locking teeth 2216 extending radially from the operation portion 2211 are formed on the upper surface of the large-diameter portion 2212 (not shown in the figure). 8) at intervals of 45 degrees. The cylindrical portion 211 is formed with a plurality of locking pieces 2111 (eight at an interval of approximately 45 degrees in the figure) protruding from the inner peripheral portion toward the center. The locking piece 2111 is set such that the length protruding from the inner peripheral portion of the cylindrical portion 211 does not contact the outer peripheral portion of the operation portion 2211.

  As shown in FIG. 10C, when the rotating body 221 is urged upward by the coil spring 223, the upper end portion of the locking tooth 2216 abuts on the ceiling portion of the frame 21, and the horizontal direction (FIG. 10C ) In the direction orthogonal to the paper surface), the locking piece 2111 of the cylindrical portion 211 and the locking teeth 2216 overlap each other. In the connection device 2 of the first modification, even when the rotating body 221 rotates in the counterclockwise direction in which the wire W is fed from the winding portion 2214 to the shoulder side as shown in FIG. ), Even when the rotating body 221 rotates in the clockwise direction for feeding the wire W from the winding portion 2214 to the buttock side, the locking teeth 2216 abut against the locking piece 2111 of the cylindrical portion 211, The rotation of the rotating body 221 is prevented. As a result, movement of the connecting device 2 to both the buttock side and the shoulder side of the connecting device 2 is prevented.

  In order to cancel the state where the movement of the connection tool 2 shown in FIG. 10 (a), FIG. 10 (b) and FIG. 10 (c) is prevented, as shown by the arrow in FIG. By pushing 2211 toward the frame 21, the locking teeth 2216 do not overlap with the locking pieces 2111 of the cylindrical portion 211 in the horizontal direction (direction orthogonal to the paper surface in FIG. 10D). What is necessary is just to move the rotary body 221 to a state.

  In the connecting device 2 of the first modified example, the interval between the locking pieces 2111 of the cylindrical portion 211 shown in FIG. 10A and FIG. It becomes a so-called play of movement to both the side and the shoulder side. For this reason, the play of the movement of the connection tool 2 can be adjusted by changing the space | interval of the locking pieces 2111, the number of the locking pieces 2111 to provide, etc. FIG.

  11 (a) and FIG. 11 (b) correspond to FIG. 8 (b) and FIG. 8 (c) in the connecting device 2 of the second modified example, and the case where the rotation of the winding roller 22 is prevented. It is a figure which shows notionally the case where it is accept | permitted. Moreover, FIG.11 (c) and the same figure (d) are the figures corresponding to FIG. 9 (a) and the same figure (b) in the connection instrument 2 of a 2nd modification.

  As shown in FIG. 11C and FIG. 11D, the winding roller 22 does not have the coil spring 223 shown in FIG. 9, and the rotating body 221 is an upper flange provided on the shaft body 222. It is provided so as to be rotatable with respect to the shaft body 222 while being sandwiched between 2223 and the fixed flange 2221. Thereby, the vertical position of the rotating body 221 with respect to the shaft body 222 is fixed. Further, as shown in FIG. 11, the large-diameter portion 2212 of the rotating body 221 has four cutout portions 2212d cut out toward the center at approximately 45 degree intervals.

  As shown in FIG. 11C and FIG. 11D, in the connecting device 2 of the second modification, the locking piece 2111 of the cylindrical portion 211 shown in FIG. 8B and FIG. Instead, a stopper member 24 is provided. The stopper member 24 includes a rotating shaft 243 extending in a direction orthogonal to the paper surface at the ceiling portion of the frame 21, a stopper main body 241 attached to the rotating shaft 243, one end attached to the shaft portion 2222, and the other end serving as a stopper. A tension coil spring 244 attached to the main body 241 is provided. The stopper main body 241 is provided at the lower end of the rod-like operation portion 241a whose tip protrudes from the frame 21 and the operation portion 241a. As shown in FIG. 11A and FIG. The cross section has a wedge portion 241b having a wedge shape. The stopper main body 241 is provided such that the wedge portion 241b side is rotatable in a direction away from the rotating body 221 and a direction approaching the rotating body 221, and is pulled in a direction approaching the rotating body 221 by the tension coil spring 244. Yes.

  As shown in FIG. 11A and FIG. 11C, when the wedge part 241b enters the notch part 2212d of the large diameter part 2212 when it is pulled by the tension coil spring 244, the rotating body 221 rotates. Thus, the movement of the connecting device 2 to both the buttock side and the shoulder side of the wire W is blocked. On the other hand, as shown by the arrow in FIG. 11 (d), if the operating portion 241a of the stopper main body 241 is put on the hand and tilted to the buttock side, the wedge portion 241b side of the stopper main body 241 is opposed to the tension coil spring 244. It rotates in the direction away from the rotating body 221, and the wedge portion 241b comes out of the notch 2212d. As a result, as shown by the double-headed arrow in FIG. 11B, the rotation of the rotating body 221 is allowed, and the connection tool 2 can be moved to either the buttock side or the shoulder side with respect to the wire W. . When the rotating body 221 rotates to the position where the wedge 241b enters the notch 2212d by releasing the operation part 241a of the stopper body 241, the wedge 241b enters the notch 2212d by being pulled by the tension coil spring 244. The rotation of the rotating body 221 is prevented.

  12 (a) and FIG. 12 (b) are views corresponding to FIG. 11 (a) and FIG. 11 (b) in the connection device 2 of the third modified example, and FIG. 12 (c) and FIG. d) It is a figure corresponding to Drawing 11 (c) and the figure (d) in connecting implement 2 of the 3rd modification. Compared with the connection device 2 of the second modification example shown in FIG. 11, the connection device 2 of the third modification example mainly includes an aspect of a notch 2212 d formed in the large-diameter portion 2212 of the rotating body 221 and a stopper member 24. The configuration and its position are different.

  As shown in FIG. 12A and FIG. 12B, in the connection device 2 of the third modification, one notch 2212 d is formed in the large diameter portion 2212 of the rotating body 221. Further, as shown in FIGS. 12C and 12D, the stopper member 24 is provided on the side of the bottom of the shaft 2222, one end is attached to the ceiling portion of the frame 21, and the other end is the stopper. The main body 241 has a compression coil spring 245 attached to the wedge portion 241b. By this compression coil spring 245, the stopper main body 241 is urged in a direction in which the wedge portion 241 b approaches the rotating body 221.

  As shown in FIG. 12A and FIG. 12C, when the wedge portion 241 b is energized by the compression coil spring 245 and enters the notch portion 2212 d of the large diameter portion 2212, The rotation is prevented, and the movement of the connecting device 2 to both the buttock side and the shoulder side is prevented with respect to the wire W. On the other hand, as shown by the arrow in FIG. 12 (d), if the operation portion 241a of the stopper main body 241 is put on the hand and tilted to the shoulder side, the wedge portion 241b side of the stopper main body 241 is opposed to the compression coil spring 245. It rotates in the direction away from the rotating body 221, and the wedge portion 241b comes out of the notch 2212d. As a result, the rotation of the rotating body 221 in the direction of feeding the wire W from the winding portion 2214 to the shoulder side as indicated by the solid line arrow in FIG. Can be moved to the side. Further, the rotation of the rotating body 221 in the direction of feeding the wire W from the winding portion 2214 to the butt end side as indicated by the one-dot chain line arrow in FIG. It can also be moved to the side.

  According to the connection tool 2 of the third modification, the operation to allow the rotation of the rotating body 221 is performed in a direction away from the worker M shown in FIG. 2, as indicated by the arrow in FIG. The operation unit 241a is tilted down, and malfunctions such as accidentally placing the hand on the operation unit 241a and inadvertently allowing the rotation of the rotating body 221 are suppressed.

  11, four cutout portions 2212d are formed in the large-diameter portion 2212. In the connection device 2 of the third modification shown in FIG. 12, the cutout portion is formed in the large-diameter portion 2212. Although one portion 2212d is formed, the number of notches 2212d is not particularly limited. For example, two or three notches 2212d may be formed, or five or more notches 2212d are provided, and as soon as the operator M releases his / her hand from the operation portion 241a of the stopper main body 241, the wedge portion 241b. May be configured to enter the notch 2212d.

  Next, a second embodiment of the fall prevention device 1 described so far will be described. In the following description of the second embodiment, the difference from the fall prevention device 1 described so far will be mainly described, and the components having the same names as the names of the components described so far have been used. A description will be given with reference numerals, and redundant description may be omitted.

  Drawing 13 is a figure which looked at worker M who performs a spraying process using the fall preventive device of a 2nd embodiment from the upper part. In FIG. 13, the winder 3 shown in FIG. 2 is hidden below the second winder 52.

  As shown in FIG. 13, in the fall prevention device 1 of the second embodiment, the connection tool 2 is provided with a pair of claw members 63 and 63 as a rope fixing mechanism. These claw members 63 and 63 together with the operation unit 2211 constitute a four-bar linkage mechanism as shown in FIG. Further, the operation unit 2211 has a stopper (not shown) that prevents the winding roller 22 from rotating. For example, the stopper can be inserted into a groove provided in the rotating body of the winding roller 22 to thereby prevent the rotating body of the winding roller 22 from rotating.

  Accordingly, when the operator M shown in FIG. 2 puts his weight on the buttock side, the operation portion 2211 is pulled to the buttock side by the rope-side lanyard 7 attached to the connecting ring 64, and the four-bar linkage mechanism The push claws 631 (see FIG. 4) of the claw member 63 fasten the rope R, and the connecting device 2 is firmly fixed to the rope R. As a result, the operator M is held on the rope R via the connecting device 2, the rope-side lanyard 7 and the safety belt 8. In addition, the winding roller 22 is prevented from rotating by a stopper (not shown), whereby the movement of the connecting device 2 to both the shoulder side and the tail side with respect to the wire W is stopped.

  When the worker M moves up and down the slope, for example, the worker M grasps a portion of the rope R closer to the shoulder side than the portion held by the connecting device 2 with the right hand, and applies the load applied to the slope side. To release. Then, the connection tool 2 is grasped with, for example, the left hand, and the operation unit 2211 is pushed to the shoulder side. If it carries out like this, the pushing nail | claw 631 (refer FIG. 4) will be in the state which floated from the rope R, the fixation to the rope R of the connection tool 2 will be cancelled | released, and prevention of rotation of the winding roller 22 by a stopper not shown. Is also released. Thus, the worker M can move up and down the slope. On the other hand, if the operator M releases his left hand from the connecting device 2 and puts his weight on the buttock side, the connecting device 2 is firmly fixed to the rope R, and the operator M is held on the rope R. The rotation of the rotation roller 22 is prevented. As described above, according to the fall prevention device 1 of the second embodiment, the connection tool 2 can be fixed to and released from the rope R and the wire W by one operation of the worker M. Can be performed more easily.

  In addition, in the fall prevention device 1 of the second embodiment, when the rope R is cut, the worker is provided with the wire W, the connecting device 2 fixed to the wire W, and the rope-side lanyard 7 attached to the connecting device 2. M can be held. For this reason, the wire side lanyard 5 can be omitted. Also, a gripping rod 62 for operating the claw members 63 and 63 and an operation portion of a stopper (not shown) for preventing the winding roller 22 from rotating may be provided separately as shown in FIG. In the case of an aspect provided separately, the operation portion of the stopper corresponds to an example of the second operation portion, and the grip rod 62 and the second operation portion are operated together with one hand (for example, the grip rod 62 with the thumb of the left hand). It is preferable that the second operation unit is pressed inside the left hand).

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope described in the claims. For example, in the above-described embodiment, as shown in FIG. 8A, the wire W extending from the shoulder side to the tail side is the right side of the winding portion 2214 (see FIG. 9) (the rope R shown in FIG. 2). Although the aspect located in the side is employ | adopted, you may employ | adopt the aspect in which the wire W is located in the left side (opposite side to the rope R shown in FIG. 2) of the winding part 2214 (refer FIG. 9). Further, as shown in FIG. 9, the wire W adopts a mode in which the shoulder side is higher and the shoulder side is lower than the portion wound around the winding portion 2214, but conversely, the shoulder side is lower. You may wind around the winding part 2214 so that the leg length side may become high. However, it is preferable to adopt a mode in which the shoulder side becomes higher and the shoulder side becomes lower because the portion on the shoulder side of the wire W than the connection device 2 is less likely to come into contact with the sprayed mortar. Furthermore, in the said embodiment, although the wire W was fastened to support bodies, such as a standing tree and an anchor bar provided in the shoulder, it demonstrated and demonstrated as an example the mode that the operator M descend | falls to a law bottom. When the worker M gets down to the middle of the slope S, the wire W is unfastened from the support provided on the shoulder and fastened to an anchor or the like standing near the worker M. The person M may get off the slope S. If this aspect is employ | adopted, the length of the wire W can be shortened. For this reason, the quantity of the wire W wound up by the winder 3 decreases, and the weight of the winder 3 can be suppressed.

  In addition, even if it is a structural requirement contained only in each description of each embodiment and each modification demonstrated above, you may apply the structural requirement to another embodiment and a modification.

DESCRIPTION OF SYMBOLS 1 Fall prevention device 2 Connecting tool 22 Winding roller 24 Stopper member 3 Winder 5 Wire side run lard 51 Band-like rope 52 2nd winder 6 Grip 63 Claw member 7 Rope side lanyard 8 Safety belt H Supply hose M Worker R Rope S Slope W Wire

Claims (4)

A winder that winds and unwinds the wire that is attached to the safety belt worn by the operator and suspended on the slope;
A connecting device having a wire fixing mechanism for fixing to the wire;
A crash prevention device comprising: the connection tool and a lanyard that connects the safety belt. The lanyard has a total length of 2 m or less,
The fall prevention device according to claim 1, further comprising a second winder that is attached to the safety belt and winds and feeds the lanyard.   The fall prevention device according to claim 1, wherein the connection instrument has a rope fixing mechanism for fixing to a rope suspended on a slope. The wire fixing mechanism is
A roller disposed rotatably and wound with the wire;
A stopper for preventing rotation of the roller in a direction in which the wire is drawn from the roller to the side opposite to the safety belt side. The fall prevention device as described.