JP2006158229A - Method for preventing fall at work on tree top - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for preventing a fall at work on a tree top comprising using a rope to surely prevent a worker from falling down from the top of a tree when going up and down the tree or moving on the tree to work on the tree top through an extremely simple operation for fall prevention with no need of any skill and specific equipment, tools and materials. <P>SOLUTION: The method for preventing a fall at work on a tree top comprises the following process: stocking a fall-preventive rope 1 on the earth side; fixing the leading side 1a of the rope 1 in the vicinity of the root of a tree T; fastening a winding/fastening rope body 3 around the tree T at a height reaching from the ground to form a first supporting point P1; sequentially passing the rope 1 following its leading side 1a through an opening/closing clip ring 4 held on the winding/fastening rope body 3 and a slide stopper 2, the worker M puts on her (his) body to make the rope body droop down to a stock part 10; and sequentially forming supporting points P following a second supporting point P2 made through fastening the winding/fastening rope body 3 around the tree M in series every necessary height starting from the position higher than the first supporting point P1; and passing the remaining part 11 of the rope 1 held between the sliding stopper 2 and the lower supporting point P through the opening/closing clip ring 4 held by the winding/fastening rope body 3 at each of the supporting points P while the worker M climbs the tree T. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for preventing a fall during tree work such as pruning garden trees, street trees, park trees, pruning tree planting, disease prevention and treatment of trees, and the like.

  Conventionally, when pruning trees by gardeners, etc., when an operator climbs a high place on a standing tree and works to secure the safety of the worker at a high place, the worker's body is roped and various mooring tools. Generally, a method of connecting to the surrounding trunks and branches using the is used. However, when climbing up and down along the trunk of an operator or moving on a tree, there are few effective fall prevention measures at present, and crashes often occur for this reason.

On the other hand, as a tree-climbing technique in the United States, a thin leading rope with a weight attached to the tip is thrown up by hand throwing or a projector, and this is passed through the crotch portion of the standing tree height, and the tip side with the dropped weight is taken up. As a result, the suspension rope connected to the end of the leading rope is pulled up and passed to the crotch portion, and the tip end portion of the suspension rope is fixed to a point on the ground side and is suspended from the crotch portion. Various methods of climbing the rope by hand while the mooring tool attached to the operator's body is fastened to the rope for suspension and the body is supported by the rope for suspension are introduced. (Non-Patent Document 1).
Jeff Jepson (2002) The Tree Climber's Companion (2nd Edition), Beav-er Tree Publishing.

  However, with the above tree climbing technology, if the support strength by the suspension rope can be secured sufficiently, fall prevention can be achieved, but the state of the crotch portion of the high place where the rope is passed is difficult to understand from the ground, so scales and rot etc. There is a risk that it may break during climbing and lead to an accident, and it may not be able to be passed depending on the branching and surrounding conditions, and the leading rope is passed over the intended crotch part of Tachiki Heights In addition, it is not easy, and it has the basic difficulty that it requires a high level of skill and considerable physical strength in order for a worker to climb a rope for suspension.

  In view of the above circumstances, the present invention can reliably prevent a fall using a rope when an operator climbs up and down a trunk for tree work or moves on a tree. To provide a crash prevention method that can be performed easily without any skill, can perform the required work at a high altitude without any problems, and does not require special equipment and equipment. It is an object.

  In order to achieve the above object, the fall prevention method for tree work according to the invention of claim 1 can be used when the worker M climbs up the standing tree T and performs the tree work if shown with reference numerals in the drawings. The start end side 1a of the fall prevention rope 1 stocked on the ground side is fixed near the root of the standing tree T as a work target, and the worker M wears a sliding stopper 2 that is actuated by the weight load on the rope 1 passed through. The winding cord 3 is wound around a required position of the standing tree T to form a first support point P1, and the opening-side clip ring 4 held on the winding cord at the first support point P1 is connected to the start end side. Pass the fall-preventing rope 1 from 1a, pass the rope 1 further through the sliding stopper 2 and hang it down to the ground side. In the same way, support points P after the second support point P2 by the winding cord ... and at each of these support points P, winding A retractable clip ring is held by the cable body for fit, it is characterized by passing the surplus portion 11 of the rope 1 which has been held between the supporting point P of the slide stopper 2 and lower.

  According to a second aspect of the present invention, in the fall prevention method of the first aspect, the winding cord 3 is formed in a single ring shape, and is wound around the standing tree T in the form of a double straight line extending the ring shape. The one end side 3a, which is associated with each other, is passed through a ring on the other end side 3b, and the support point P is formed so that the opening-and-closing clip ring 4 is fitted to the ring on the one end side.

  A third aspect of the present invention is the fall prevention method according to the second aspect, wherein a string-like object for releasing the winding is formed on the ring portion on the other end side 3b of the ring-shaped winding cord 3 in which the support point P is formed. 7 is used, and the lower end of the string-like object is suspended near the ground.

  According to a fourth aspect of the present invention, in the fall prevention method according to any one of the first to third aspects, the winding cord is composed of a sling belt 3.

  A fifth aspect of the present invention is the fall prevention method according to any one of the first to fourth aspects, wherein the openable clip ring is a carabiner 4.

  According to a sixth aspect of the present invention, in the fall prevention method according to any one of the first to fifth aspects, the sliding stopper 2 has a rope 1 between the fixed hooking portion 21 and the movable winding portion 22 with the lever 20. Is wound in an S-shape, and the movable winding portion 22 is urged in the direction of sandwiching the lobe 1 with the fixed hooking portion 21 by the tensile force of the lobe 1, and the movable winding portion 22 is energized. However, the lever 20 is displaced so as to loosen the rope 1.

  According to the fall prevention method for tree work according to the invention of claim 1, an operator accidentally slips a hand or a foot while climbing up and down a tree, moving on a tree, or during a predetermined tree work. Even if it falls, the rope surplus part from the clip ring of the support point closest to the position where it starts to fall to the sliding stopper extends at the same time as the sliding stopper operates, and the operator's body is removed from the clip ring. The rope is suspended by the length of the rope surplus part, so that the fall is stopped, so that the fall to the ground is surely avoided, and the impact of the falling worker's body when it stops in the hanging state is small. If you hit the tree trunk, you don't have to worry about serious injury. In addition, when climbing up the trunk or large branches, the remaining rope surplus part becomes shorter at the stage where the rope surplus part is passed through the clip ring of the lower support point provided earlier, so the body is hung on this short rope surplus part. It is also possible to perform the operation of providing the next support point in a state where it is held and hung, and even when it is difficult to deposit the body on the standing tree itself due to the state of the trunk or branch, etc., it can be dealt with sufficiently. Furthermore, when the tree work is completed and pulled off, the rope is removed from the clip ring at each support point in the reverse order of installation, and the rope is pulled back from the sliding stopper to the stock part side to shorten the excess part. However, the clip ring and the winding cord may be removed and recovered, and even if the clip ring is accidentally dropped in the middle of the clip ring, the fall is also stopped while hanging from the nearest support point. In addition, when going down to the ground temporarily during breaks, etc., simply remove the rope from the clip ring and shorten the surplus part. A predetermined position can be reached.

  Thus, in this fall prevention method, climbing up and down trees and moving and working on trees can be performed safely, and skill is not required for the implementation, and special equipment and equipment are not required. You can use what is commonly used for rock climbing and pruning work as it is, and just prepare the fall prevention rope placed on the ground near the root of the standing tree in preparation for the stage before climbing the standing tree. There is no need to hang a rope over the height of a standing tree, and there is no need for an assistant to secure the rope on the ground side, and it is possible for an operator to operate all alone including preparations.

  According to the second aspect of the present invention, since the winding cord is formed in a single ring shape, the one end side that is wound around the standing tree in the form of a double straight line extending from the ring shape is connected to the other end side. By simply passing the opening and closing clip ring through the ring on one end, the support point can be formed very easily, and the weight of the opening and closing clip ring acts in the direction that tightens the tree. Therefore, the support point is hard to be displaced, and it is solid and can cope with the difference in the thickness of the trunk or branch at the winding position, and even if the length is short due to its thickness, the two are connected. There is an advantage that it can be wound in the same manner in the shape of an oval.

  According to the invention of claim 3, when the support point formed by the winding cord that forms the entire ring is not necessary, the ring on the other end side of the winding cord is not required. By pulling the string-like object secured to the portion from the ground, the winding cord is unwound, so that the winding cord and the openable clip ring can be pulled down to the ground and recovered.

  According to the invention of claim 4, since the sling belt is used as the winding rope, the formed support point is more difficult to be displaced and has high strength.

  According to the invention of claim 5, since a carabiner is used as the openable / closable clip ring, there is an advantage that an attaching / detaching operation and a rope engaging / disengaging operation with respect to the winding cord can be easily performed.

  According to invention of Claim 6, since the thing of the specific structure which a stopper function works by the tension | tensile_strength of the lobe passed through as this sliding stopper is used, by the sudden weight load at the time of an operator falling There is an advantage that the stopper function can be exhibited more reliably, and what is generally used as a lowering device in rock climbing can be used as it is.

  Hereinafter, a case where an operator climbs a standing tree directly from the ground will be described in detail with reference to the drawings as an embodiment of the method for preventing fall of tree work according to the present invention. FIGS. 1A to 1C are schematic views showing a state of climbing a tree to which the present invention is applied, in which M is an operator, T is a standing tree, P1 to P5 are first to fifth support points ( 1 is a fall prevention rope.

  When the worker M climbs the standing tree T directly from the ground position for tree work such as pruning, first, the start end side 1a of the fall prevention rope 1 is set at the root of the standing tree T as shown in FIG. The bundle of ropes 1 is bundled in a shape that cannot be unwound by winding or the like, and the bundle of ropes 1 is placed on the ground as a stock unit 10, while the worker M wears a sliding stopper 2 that is actuated by the weight load applied to the ropes 1. Then, the short winding cord 3 is wound around the position where the hand of the tree T reaches and reaches the first support point P1, and the opening and closing clip ring 4 is held by the winding cord 3. Then, the rope 1 from the one end side 1 a is passed through the clip ring 4, and the rope 1 is further passed through the sliding stopper 2 and then hung down to the stock portion 10. In this case, the height of the first support point P1 from the ground is preferably set to about 2 m.

  Next, the worker M climbs the standing tree T, and as shown in FIG. 1 (B), secures the body at the required height position and winds the winding cord higher than the first support point P1 of the standing tree T. The body 3 is wound around to form a second support point P2, and the retractable clip body 3 holds the openable clip ring 4 and the rope surplus retained between the sliding stopper 2 and the first support point P1. After passing the portion 11 through the clip ring 4 at the second support point P2, the rope surplus portion 11 having a required length is provided between the slide stopper 2 and the second support point P2 by feeding out from the slide stopper 2 again. After holding, climb Tachiki T. Then, while securing the body at a required height position, the winding cord 3 is wound around a position higher than the second support point P2 and reaches the rope surplus portion 11 to form a third support point P3. The rope surplus portion 11 is passed through the openable / closable clip ring 4 held by the fastening cord 3, and the required length is provided between the sliding stopper 2 and the second support point P3 by feeding from the sliding stopper 2. The rope surplus portion 11 is reserved.

  Thereafter, in the same manner, as shown in FIG. 1C, while holding support points P4, P5,.. What is necessary is just to reach | attain the high place which should perform work, such as the pruning of the standing tree T, so that it may let it pass through the made openable-type clip ring 3. In addition, the distance between each support point after the second support point P2 and the lower support point is larger than the distance d between the root portion of the tree T and the first support point P1 where the starting end side 1a of the rope 1 is bound. It should be shortened and is usually set to about 0.5 to 1.5 m.

  According to such a method, even if the worker M falls while sliding his hand or foot while climbing the standing tree T, the fall prevention rope through the clip ring 4 of the support point closest to the position at which the worker M starts to fall. 1 is always connected to the sliding stopper 2 worn by the worker M, so that the rope surplus portion 11 from the clip ring 4 to the sliding stopper 2 at that time extends to the rope 1 at the same time. The sliding stopper 2 is actuated by the weight load, and the body of the worker M is suspended from the clip ring 4 by the length of the rope surplus portion 11 so that the fall is stopped and the fall to the ground is surely avoided. become. Therefore, the length of the rope surplus portion 11 set in each stage may be slightly longer than the distance from the previously provided support point to the next higher support point. For example, the distance between the support points is Even when it is as wide as 1.5 m, it is less than 2 m at the longest. Therefore, the impact when the body of the worker M who falls is stopped in a suspended state is small, and there is no fear of serious injury even if the body hits the trunk of the tree when stopping.

  When climbing up the tree T, the remaining rope surplus portion 11 is shortened when the rope surplus portion 11 is passed through the clip ring 4 of the lower support point provided earlier, so the support point interval is set to less than 1 m. In this case, it is also possible to perform an operation for providing the next higher support point in a state where the body is suspended by the short rope surplus portion 11, that is, in a state where the limb is separated from the standing tree T and freely hung. is there. Therefore, when providing a support point, even if it is difficult to deposit the body on the standing tree T itself due to the state of the trunk or branch, etc., it can be sufficiently dealt with.

  In the above-described embodiment, the case where the worker M climbs directly to the standing tree T from the ground is exemplified. However, climbing from the ground position is performed depending on the thickness and tree shape of the target standing tree, the situation around the root, the work content, the working position, and the like. If it is difficult or inconvenient, the operation of providing the first support point P1 may be started after reaching a certain height of the stand T using a stepladder, a ladder, or the like. However, in this case as well, the start end side 1a of the fall prevention rope 1 is previously tied to the root of the standing tree T, and the rope 1 is used as a hand to pull up the stepladder, ladder, etc. while pulling it out from the stock part 10 on the ground. The first support point P1 is pulled up to the set position. In FIG. 1, the start end side 1a of the fall prevention rope 1 is directly tied to and fixed to the root of the standing tree T. However, the fixing may be performed near the root, and the start end side 1a can be fixed near the root. If there is an object such as a pile that can secure the supporting strength, the object may be used.

  Thus, after the worker M climbs to the predetermined height of the standing tree T, the support point P is continuously set up to the site where the tree work is performed, and the work site is moved or moved between the plurality of work sites. Even when moving on the tree, it is preferable to provide the support points P... In each forward travel stroke regardless of the movement direction. As a result, even if you slide your foot while working on the tree or moving, the fall will stop in the form of hanging from the support point in the same way, so you can ensure safety and secure the mooring tool separately at the work position This saves you the trouble of tying your body to surrounding trunks and branches. Of course, when securing the travel on the tree while providing the support points P as described above, the distance from the support point P provided immediately before the newly provided support point P falls near the newly provided support point P. In this case, it is natural that the worker M should fall within the range in which the worker M hangs from the support point P provided immediately before without falling to the ground. If it considers, it is good to make it within 2 m similarly to the time of climbing to the standing tree T.

  On the other hand, when descending from the standing tree T after finishing the tree work, the rope 1 is removed from the clip ring 4 in order from the support point on the advanced side, and from the sliding stopper 2 to the stock unit 10 side. The rope 1 is pulled back to shorten the surplus portion 11, and the clip ring 4 and the winding cord 3 may be removed and recovered. Therefore, even if it falls accidentally on the way down, the fall stops as it hangs from the lower support point, so the fall to the ground is also avoided. Note that the rope 1 is removed from the clip ring 4 and the surplus portion 11 is removed when temporarily going down to the ground during a break or moving in the direction of temporarily returning the stroke provided with the support points P on the tree. If each support point P is left only by shortening the operation, the existing support point P can be used when returning to the original part again, and labor is remarkably reduced.

  As described above, according to the present method, the climbing up and down of the standing tree T and the movement on the tree can be easily and safely performed without requiring special equipment and equipment, and without requiring skill. It is only necessary to fix the start end side 1a of the fall prevention rope 1 placed on the ground near the base of the standing tree T, and it is not necessary to hang the rope around the height of the standing tree T in advance. In addition, an assistant who secures the rope is unnecessary, and it is possible for the worker M to operate all by himself including preparations.

  FIG. 2 shows a specific example of equipment used when the worker M climbs the standing tree T. In this case, the worker M wears a safety band (harness) 5 in which a waist belt 5a and ring-shaped foot belts 5b and 5b fitted to both thighs are integrated, and a suspension part 5c of the safety band 5 in front of the stomach. The sliding stopper 2 is attached via a carabiner 6. On the other hand, a ring-shaped sling belt (hereinafter referred to as a sling belt 3) is used as the winding cord 3 used for forming the support point P, and a carabiner (hereinafter referred to as a carabiner) as the opening-and-closing clip ring 4 of the support point P. 4).

  Then, the ring-shaped sling belt 3 is formed in a double straight line extending the ring shape as shown by an imaginary line in FIG. 2 and wound around the trunk of the tree T, and is associated with one end side 3a as shown by the solid line in FIG. The support point P is formed by passing the carabiner 4 through the ring on the one end side 3a. In addition, the fall prevention rope 1 from the start side 1a fixed near the root of the standing tree T is passed through the carabiner 4 at the support point P, and further, the rope 1 is passed through the sliding stopper 2 and the stock on the ground as described above. It hangs down to the part 10 (refer FIG. 1).

  The sliding stopper 2 illustrated here is the same as a lowering device widely used in rock climbing. With the climber of rock climbing, when the climber hangs on the rope that has passed through, the tension of the rope due to the human body load naturally acts as a stopper function to prevent the climber from sliding. While the body is held at a fixed position, the climber holds the hand and presses the lever 20 to release the stopper function so that the climber can descend along the rope. On the other hand, the sliding stopper 2 in the method of the present invention does not put weight on the fall prevention rope 1 in a state where the worker M normally climbs a tree, so the stopper function does not work and the sliding stopper 2 does not work. Since the rope 1 can be slid with a certain amount of resistance, the rope 1 can be pulled out as described above to secure the surplus portion 11 having a desired length. When the worker M accidentally falls, the stopper function is automatically activated by the load on the human body, and the worker M is in a hanging state similar to that of a climber in rock climbing. Can be lowered to the ground or to a desired height by pressing the lever 20.

  The sling belt 3 is also called a sounsling, and is made of a high-strength and highly frictional cloth material that is used to hold the body at high places such as pruning afforestation, as shown in FIG. Thus, it is stably held in the state of being wound around the trunk of the tree T, and even if a sudden heavy load is applied to the carabiner 4, no slipping occurs, so it can withstand the impact and load when the worker M falls. It functions reliably as the support point P. Thus, with such a winding method, it is possible to cope with differences in the thickness of the trunk or branch at the winding position, and even if the length is insufficient due to the thickness, the two are connected to each other. It can be wound up in the same way.

  Moreover, as the fall prevention rope 1, in order to suppress the impact when the body of the worker M who falls is stopped by the rope, a rope having a low elasticity such as a static rope for limb climbing or an arborist rope is preferable. The length is prepared to be 1.5 times or more, more preferably twice or more of the stroke from the ground to the site where the standing work of the standing tree T is required.

  In addition, it is necessary for the operator M to have the sling belt 3 and the carabiner 4 corresponding to the number of the support points P ... after the second support point P2 while climbing the standing tree T. Is usually hung on a hanging tool (not shown) provided on the waist belt 5a of the safety belt 5, or carried in a rucksack or the like together with other work equipment. However, if there is an assistant on the ground side, it can be thrown up from below and received by the worker M climbing the tree.

  3A, 3B, and 4 show the detailed structure of the sliding stopper 2 illustrated in FIG. In this sliding stopper 2, two metal strips 2a and 2b are pivotally mounted at the center via pivot pins 23 made of bolts and nuts, and the pivot pins are sandwiched between the strips 2a and 2b. And a cam-shaped movable wrapping portion 22 pivotally attached to the belt 23, and a cam-shaped movable wrapping portion 22 which is fixed to the band plate 2a side via a locking pin 24 made of a bolt and a nut on the tip side of the movable wrapping portion 22. A fixed hooking portion 21 and a guide pin 25 fixed to the band plate 2a on the distal end side further than the fixed hooking portion 21 are disposed, and the movable winding portion 22 extends to the side proximal end side. The lever 20 to be taken out is fixed integrally. Thus, the fixed hooking portion 21 and the movable winding portion 22 are both in the shape of a piece and have guide grooves 21a and 22a on the circumferential surface, but the circumferential surface portions facing each other are linear flat portions 21b and 22b. Yes. Further, as shown in FIG. 4, a long hole 26 is provided on the base end side of the band plate 2a, while the base end side of the band plate 2b constitutes a hook portion 27, and both the band plates 2a and 2b overlap. In this state, the carabiner 6 on the worker M side is passed through the long hole 26 and the hook portion 27. Reference numeral 28 denotes a lock piece pivotally attached to the band plate 2b via a pivot pin 28a, which is normally urged in a direction to close the inlet side of the hook portion 27 by a spring material not shown.

  In order to pass the fall prevention rope 1 through the sliding stopper 2, the band plate 2b is rotationally displaced and crossed with the band plate 2a as shown by the phantom line in FIG. 3A. The side of the rope 1 connected to the stock part 10 is led out from between the guide pin 25 at the tip part and the fixed hook part 21, and is wound in an S-shape passing between the hook parts 21, 22, and then the band What is necessary is just to return the board 2b to the state which overlaps with the strip 2a. Thus, the band plate 2b is provided with locking notches 29a and 29b on the front end side, and these notches 29a and 29b are respectively engaged with the locking pin 24 and the guide pin 25 on the band plate 2a side. Thus, it is stably held in a state where it overlaps with the band plate 2a. Further, since the base plate 2b has a hook portion 27 on the base end side, even if the carabiner 6 is passed through, the carabiner 6 is pushed inward against the spring force, so that the carabiner 6 The hook portion 27 can be detached from 6 and rotated and displaced as shown by the phantom line in FIG. Therefore, even when the sliding stopper 2 is connected to the worker M side, the fall prevention rope 1 can be engaged with and disengaged from the sliding stopper 2.

  In such a sliding stopper 2, the linear flat portion 22 b of the movable winding portion 22 is assumed to be virtual in FIG. 4 in a state where the tension force due to the weight load (human body load) is not applied to the fall-preventing rope 1. As shown by the line, since the clamping force does not act on the rope 1 which is substantially parallel to the flat portion 21b of the fixed winding portion 21 and passes between the both winding portions 21 and 22, sliding by the S-shaped winding form Although resistance is applied, the rope 1 can be pulled out in any direction, and the surplus portion 11 can be arbitrarily set. However, when the operator M falls and a human body load is applied to the rope 1, the rope 1 is pulled in the direction of arrow a in FIG. As indicated by the solid line, the rope 1 is rotated and displaced, so that the flat portions 21b and 22b of both the wrapping portions 21 and 22 become non-parallel and the interval is narrowed. The worker M who has fallen tightly and becomes unable to slide, is stopped in a state of being hung on the rope 1, and is prevented from dropping on the ground. Accordingly, the lever 20 protrudes laterally as shown by the solid line from the state of the phantom line in accordance with the rotational displacement of the movable winding part 22, so that the operator M hanging on the rope 1 can move the lever 20. Is pressed, the movable wrapping portion 22 returns to the state shown by the solid line in FIG. 2 and the squeezing of the rope 1 passing between the wrapping portions 21 and 22 is released, and the worker M can descend along the rope 1. .

  FIGS. 5A and 5B and FIGS. 6A and 6B show a carabiner as an opening / closing type clip ring 4 held by a sling belt 3 at a support point P. FIG. In this carabiner, an opening / closing piece 4b is pivotally attached to one end side of the cleavage portion 40 of the substantially C-shaped main body 4a via a pivot pin 41 on the proximal end side. A locking recess 42 that opens inward on the end side is provided, and the opening / closing piece 4b is always urged in the forward tilting direction by a spring material (not shown) interposed in the pivoting portion on the base end side, and its distal end portion The locking pin 43 provided on the engaging portion engages with the locking recess 42 to close the cleavage portion 40, and a locking sleep 44 is fitted on the opening / closing piece 4b so as to be rotatable in the circumferential direction. The locking sleep 44 has a length applied to both ends of the cleaving portion 40 of the main body 4a, and U-shaped notches 44a and 44b are provided at the same circumferential positions on both ends. Due to the biasing of the material (not shown), the U-shaped notches 44a and 44b are normally held in a rotational position located sideways as shown in FIGS. 5 (A) and 6 (A), thereby closing. The open / close piece 4b in the state is locked so as not to tilt. Thus, the lock is released by rotating the sleep 44 against the spring force so that the U-shaped cutouts 44a and 44b are positioned forward as shown in FIG. 6B. The opening / closing piece 4b can be tilted inward as shown in FIG. 5 (B), so that the sling belt 3 and the fall prevention rope 1 can be engaged and disengaged.

  As the winding rope used for forming the support point P, the sling belt is particularly recommended because it is excellent in strength and friction as described above, but a normal rope or the like can also be used. Therefore, these winding cords are preferably formed into a ring shape as in the illustrated sling belt 3, or provided with a ring-shaped portion at least at one end or a ring material fixed thereto. This is because at least one of both ends that are wound around and gathered around a trunk or a large branch of the tree T is ring-shaped, and the other end side is passed through the ring-shaped portion, and the opening / closing type clip ring 4 is connected to the other end side that is passed through. This is because the supporting point P can be easily formed simply by holding it. Accordingly, the clip ring 4 may be fixed to the other end side in advance, or in the configuration in which the other end side is also in a ring shape, it can be easily fitted in the ring-shaped portion in advance or after. it can.

  Moreover, if the whole looping rope is used as the winding cord, when the supporting point P formed thereby becomes unnecessary, when the worker M descends, the winding cord and the opening and closing clip ring are connected. Instead of collecting, the cord and clip ring can be collected without difficulty by operation from the ground. This collection method is illustrated in FIG.

  That is, as shown in FIG. 7, the ring-shaped sling belt 3 at the support point P is wound around the trunk of the standing tree T and the one end side 3 a is passed through the ring on the other end side 3 b, and the threaded one end side 3 a Although the carabiner 4 is in a state of being fitted to the ring, a string-like object 7 for unwinding is tied to the ring part on the other end side 3b. The lower end of the string-like object 7 is not shown in the figure, but is hung down to the ground. By pulling the string-like object 7 from the ground, the sling belt 3 is The other end side 3b is pulled down, and accordingly, the one end side 3b holding the carabiner 4 comes out of the ring portion on the other end side 3b, so that the sling belt 3 is unwound from the standing tree T, and the sling is removed. The belt 3 and the carabiner 4 are pulled down together. Therefore, when the tree work is completed, the worker M descends the standing tree T using the support points P..., But the rope 1 is removed from the carabiner 4 at each support point P and the surplus portion 11 of the rope 1 is removed. It only needs to be shortened, and it is freed from the great labor of unwinding the sling belt 3 of the supporting points P ... and unloading it with the carabiner 4 ....

  In the above embodiment, the sliding stopper 2 is used as a lowering device in the rock climbing, but the stopper function is also provided by the weight load on the rope through which the eight rings are also used in the rock climbing. Various belay devices that can be used in the same way can be used as well, such as rope knots such as breaks hitch and pluzic, and those that exhibit a stopper function by reversing the direction at the time of sudden load like rolip Is possible. The openable clip ring 4 held by the sling belt 3 at the support point P includes a carabiner with a locking sleep 44 illustrated in FIGS. 5 and 6, a carabiner without a locking sleep 44, a shackle, and a cleavage portion of the main body. Various types such as a type that opens and closes by advancement and retraction of the screw cylinder can be used, but a carabiner with a lock mechanism is most preferable in terms of ease of operation and safety. In addition, in the present invention, various design changes can be made in addition to the embodiment, such as the form of the safety belt worn by the worker M and the method of fastening the sliding stopper 2 to the worker M side.

The situation of the climbing which is one embodiment to which the fall prevention method according to the present invention is applied is sequentially shown, (A) is a schematic side view of the preparation stage of climbing, and (B) is the stage when the worker starts climbing the tree. (C) is a schematic side view at the stage of climbing to a high place in a tree. It is a side view which shows the specific example of the equipment of the worker in climbing the same tree. An example of the sliding stopper which the operator uses is shown, (A) is a front view, and (B) is a plan view. It is a vertical front view of the sliding stopper through the fall prevention rope. The carabiner which is an example of the opening-and-closing type clip ring which the operator uses is shown, (A) is a side view of a closed state, (B) is a side view of an open state. The same carabiner is shown, (A) is a front view in a closed state, and (B) is a side view in a state in which a locking sleeve is in a release position. In the same fall prevention method, it is a side view which shows the system which collect | recovers the cable body for winding of a support point, and an opening-and-closing type clip ring by operation from the ground.

Explanation of symbols

M worker P support point P1 first support point P2 second support point T standing tree 1 fall prevention rope 1a start side 10 stock part 11 surplus part of rope 2 sliding stopper 20 lever 3 winding rope (sling rope)
3a One end side 3b The other end side 4 Opening and closing type clip ring (carabiner)
5 Safety belt 6 Carabiner 7 String

Claims (6)

  When a worker climbs a standing tree and works on the tree, the start end side of the fall prevention rope stocked on the ground side is fixed near the root of the target standing tree, and the operator is operated by the weight load on the passed rope. The opening and closing clip ring that is held by the winding rope of the first support point by winding the winding rope in a required position of the standing tree and winding it as a first support point. Passing the fall prevention rope from the start end side, passing this rope further through the sliding stopper and hanging down to the ground side, in the same way, providing a support point after the second support point by the winding rope, At each of these support points, a tree top characterized by passing an excess portion of a rope held between the sliding stopper and a lower support point through an open / close clip ring held by a winding cord. Work fall prevention method.   The winding cord has a single ring shape as a whole, and is formed into a double straight line obtained by extending the ring shape. The method for preventing fall of tree work according to claim 1, wherein the support point is formed so that the openable clip ring is fitted to the ring.   A string-like object for unwinding is tied to the ring part on the other end side of the ring-shaped winding cord forming the support point, and the lower end of the string-like object is hung near the ground. The method for preventing a fall of tree work according to claim 2.   The fall prevention method of tree work in any one of Claims 1-3 in which the said cable body for winding-up consists of a sling belt.   The method for preventing a fall of tree work according to any one of claims 1 to 4, wherein the openable clip ring is a carabiner. In the sliding stopper, a rope is wound in an S shape between a fixed hooking portion and a movable winding portion with a lever. The treetop according to any one of claims 1 to 5, wherein the rope is biased in a direction in which the lobe is sandwiched, and the movable winding portion is displaced so as to loosen the sandwiching of the rope by an operation of a lever. Work fall prevention method.

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