JP4925207B2 - Method for removing trapped debris in a debris flow damming device and debris flow damming device for carrying out this method - Google Patents

Description

  The present invention relates to a suspended debris flow damming device that is stretched across, for example, a valley between mountains and dams up a debris flow and captures debris, and more particularly, a method for removing captured debris in the debris flow damming device and the method The present invention relates to a debris flow weir device.

  Conventionally, a ring net constructed by connecting a large number of ring members to each other in a mesh form is suspended from a main rope spanned between support foundations (anchorage) built on both sides of the valley, and the lower part is There has been proposed a debris flow blocking device which is fixed to a river bed and stretched so as to close a cross section of a river channel (Patent Document 1).

  This debris flow damming device is composed of a relatively lightweight member, and since it is easy to convey, the debris flow damming device has a feature that it is easy to install in a relatively steep mountain valley upstream.

  If debris flow occurs upstream of a debris flow blocking device installed in such a mountainous area, and this blocking device captures a large amount of debris, the accumulated trapped debris must be removed in preparation for the next debris flow generation. However, since the damming device is installed in a steep mountainous area, it is often difficult to put heavy machinery for removing debris into the upstream side of the damming device. For this reason, the heavy machinery is inevitably introduced to the downstream side in a relatively maintained state for conveying materials and the like when the damming device is installed.

  Since the net becomes an obstacle to removing the captured debris from the downstream side, as a countermeasure, the main rope has been first removed from the supporting foundation, and the main rope that has been removed, as well as the suspended rope and ring net connected to the main rope, have been conventionally used. After deploying on the riverbed and disassembling each member, measures were taken to leave only the ring net in the unfolded state, and then debris was removed.

JP 2003-3449 A

  When the main rope is removed from the support foundation, the stress of the main rope is released by gradually relaxing the tension of the main rope with the center hole jack, but the main rope may be composed of multiple ropes. In many cases, the stress release of each rope increases the load on the remaining rope and overloads, so it is necessary to release the stress of multiple main ropes at the same time. With labor and expense.

  In addition, since the main rope, suspension rope, and ring net are integrated, it is very difficult to deploy the weir device on the riverbed after the main rope is relieved of stress. Restoration work within the riverbed, such as the suspension rope, ring net disassembly, and assembly and re-installation of each member after debris removal, is also very time consuming, labor intensive, and expensive.

  The present invention has been made in view of the above-mentioned problems. The purpose of the present invention is to release the stress of the main rope and to remove the main rope when removing the captured debris from the downstream side. There is no need for the disassembly work between the main rope, the suspension rope and the ring net after the expansion work and the expansion, and the recovery work after the debris removal can be performed very easily.

  The invention according to claim 1, which solves the above problem, is configured in a net shape by connecting a main rope spanned across the valley above the valley and a large number of ring members sequentially and vertically. A debris flow suspended from a rope, having a ring net extending between the main rope across the valley and the river bed below the main rope, and blocking the debris flow flowing from the upstream to capture the debris A method for removing trapped debris in a damming device, wherein ring members between two vertically adjacent rows of ring member rows arranged side by side in the middle in the height direction of the suspended ring net are used as ring members. Connected by connecting members that can be connected and disconnected, and when the stone captured by the ring net is removed, the connection between the ring members by the connecting member is released, and the ring net is separated vertically Wherein forming the work space from the downstream side with respect to capture debris between the upper and lower ring net portion Te, and performs elimination of the captured debris from the ring net downstream.

  According to the invention described in claim 1, when removing the debris by heavy machinery from the downstream side of the ring net, by simply releasing the coupling of the ring member by the connecting member while leaving the main rope and the suspension rope as they are, The ring net is separated vertically at the ring member release part, and if the lower ring net part after separation is spread on the riverbed, a working space for heavy machinery is secured below the upper ring net part and accumulated It becomes possible to approach the removed stone and eliminate it. After the debris removal, the debris flow blocking device can be restored by simply recombining the ring members with the connecting member.

  Therefore, the work to be performed on the damming device for removing debris and the work for restoring the damming device are extremely simplified, and the time and cost required for the work are greatly reduced.

  According to a second aspect of the present invention, in the method of the first aspect, prior to releasing the connection between the ring members, a main rope fixing wire rope is attached to the main rope, and the main rope is captured by debris. It is characterized by maintaining the posture of holding the ring net at the time.

  In a state where the ring net captures the debris, the ring net bulges greatly downstream, so that the main rope is pulled obliquely downward with a strong force and is bent into an arc shape and has a tension. If the above disconnection is performed in this state, the tension of the main rope is released, the main rope bounces back to the original position before the debris flow, and the so-called main rope buckling occurs, resulting in an extremely dangerous situation. To do. Further, even during the disconnection work of the ring member, the tension force applied to the main rope spreads to the connection member via the ring net portion, and a tensile force is generated between the ring members connected by the connection member. Because it works, it makes the connection release work difficult.

  According to the second aspect of the present invention, since there is no buckling of the main rope as described above, and the tension force by the main rope is not exerted on the connecting member, the trapping debris can be safely removed.

  According to a third aspect of the present invention, in the method according to the first or second aspect, when the coupling between the ring members by the coupling member is released, the coupling member is located outside each of the two ring members to be released. A traction and traction release device is selected between each of the two outer ring members. And the outer ring members are moved closer to each other by a pulling operation of the pulling / pulling release device, the tension acting on the connecting member is removed, and the connecting member is disconnected.

  The ring net is subjected to a large amount of energy from the captured earth, so that the ring members are attracted to each other with a large force at the connecting portion. The large tensile force associated with the pulling inevitably acts on the connecting member, making it difficult to release the connection on the connecting member.

  According to the third aspect of the present invention, the tensile force exerted on the connecting member from the ring net due to the pressure of the captured debris is eliminated by the operation of the traction / traction releasing device, and the connection member is released. Work becomes extremely easy.

  According to a fourth aspect of the present invention, in the method according to any one of the first to third aspects, the horizontal ring member rows connected by the connecting member are provided in two or more locations in the upper and lower directions in the ring net. The ring member row to be decoupled is selected according to the pile height of the debris captured by the ring net. If comprised in this way, efficient stone removal work can be performed by the selective connection cancellation | release of the ring member row | line | column according to the pile height of the captured debris.

  According to a fifth aspect of the present invention, in the method according to any one of the first to fourth aspects, the upper ring net portion of the separated ring net is lifted upward and suspended from a suspension rope stretched above the ring net. It is characterized by doing. By configuring in this way, a large work space for removing accumulated debris from the downstream side of the ring net is secured, and the removal work becomes extremely easy.

  The invention according to claim 6 is configured as a net by sequentially connecting a main rope spanning across the valley above the valley and a large number of ring members vertically and horizontally, suspended from the main rope, A debris flow blocking device having a ring net extending across the valley and between the main rope and a river bed below the main rope, the height of the ring net being suspended from the main rope The ring members between two adjacent rows of ring members arranged side by side in the middle in the vertical direction are connected by a connecting member capable of coupling and decoupling the ring members. To do.

  The main rope and the suspension rope are preferably made of wire rope, and the ring member is formed by winding a high-strength hard steel wire in a ring shape a plurality of times, and placing the wire material at a plurality of locations at predetermined intervals in the circumferential direction. It is preferable to be constituted by binding means for binding, for example, by binding with a clip.

  It is desirable that the connecting member has a tensile strength or impact strength equal to or higher than that of the ring member, which provides the ring net with the same strength and action as when the connecting member is not used. .

  According to the sixth aspect of the present invention, even when the debris flow blocking device is installed in a steep mountain gorge, it is possible to quickly perform the operation of removing and recovering the captured debris.

  The invention according to claim 7 is the invention according to claim 6, wherein the coupling member is a shackle composed of a shackle body and a shackle bolt. By using a shackle as a connecting member, the ring members can be connected and disconnected with each other simply by screwing and unscrewing the shackle bolt to the shackle body, so the ring net can be separated and restored easily and quickly. Is done. Moreover, the shackle can bring about the strong coupling | bonding of ring members so that the debris trapping effect of a ring net may not be impaired.

  The invention according to claim 8 is the invention according to claim 6, wherein the connecting member winds a high strength wire in a ring shape a plurality of times, and binds the formed wire bundle to one or more places with a fastening member. A small-diameter ring coupling member configured as described above. Since this small-diameter ring coupling member is similar to the ring member constituting the ring net, the familiarity between the two at the time of coupling is good, and the relative movement with the ring member provides flexibility. The deformation at the time of energy absorption of the ring member in the portion is balanced so as to provide an efficient energy absorption action.

  According to the present invention, there is a debris flow blocking device in which it is difficult to remove the captured debris from the upstream side, and it is possible to easily create a situation in which debris can be removed from the downstream side, and debris flow blocking after debris removal Equipment restoration is also achieved quickly and economically with relatively little effort.

  Next, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a development view of a suspended debris flow blocking device 1 according to the present invention. In the figure, 2 is a main rope composed of a plurality of wire ropes, 3 is a wire rope suspension rope having one end coupled to the main rope 2, 4 is a ring net coupled to the other end of the suspension rope 3, and 5 is a ring. Each of the rope nets connected to the net 4 is shown. The coupling between the members 2, 3, 4 and 5 is performed using fasteners.

  As shown in FIG. 2 (A), the ring net 4 is configured such that the ring members 40 adjacent to each other are in contact with each other on the inner peripheral side, except for the coupling of some of the ring members described below. It is comprised by mutually connecting so that it may engage.

  Each ring member 40 is configured by winding a high-strength hard steel wire in a ring shape a plurality of times and bundling a plurality of locations with a binding means such as a clip at a predetermined interval in the circumferential direction. In the present embodiment, each ring member 40 is configured by winding a φ4 mm hard steel wire 15 to 25 times so as to form a ring having a diameter of 0.6 m to 1.5 m. The diameter of the wire, the size of the ring, and the number of rings can be changed as appropriate according to the required absorbability of impact energy and the assumed debris flow situation, and the material of the wire can also be selected as appropriate.

  The ring member 40 configured as described above is partially shown in FIGS. 3 (A) and 4 (A), in which 41 indicates the binding means.

  A method of forming a ring member using a hard steel wire and further manufacturing a ring net having a structure as partially shown in FIG. 2A is disclosed in Japanese Patent Application Laid-Open No. 08-053814.

  According to the present invention, the ring net 4 has the following special configuration. That is, in the ring net 4 shown in FIG. 1, the connection between the seventh and eighth ring rows 4g and 4h from the top is different from the connection shown in FIG. Has been done. 3 and 4 show specific examples of the connecting member 6.

  FIG. 3 shows a shackle 6A1 (FIG. 3B) and a double shackle 6A2 (FIG. 3C) as the connecting member 6. The shackle 6A1 shown in FIG. 3 (B) has a U-shaped shackle body 6A1a and a shackle bolt 6A1b inserted between two tip portions of the shackle body. The shackle bolt 6A1b By performing screwing and unscrewing operations, the ring formed by the shackle 6A1 is closed or opened between the tips of the shackle body 6A1a.

  A double shackle 6A2 shown in FIG. 3C is a combination of two shackles 6A1 shown in FIG. 3B so that the shackle bolts 6A1b cross and engage with each other. According to the double shackle 6A2, the arc-shaped bottom portion of the shackle body 6A1a is engaged with the ring member 40, and the ring member 40 is protected at the engaging portion.

  FIG. 4 shows a small-diameter ring coupling member 6 </ b> B as the connecting member 6. This ring coupling member 6B is, so to speak, a size reduction of the ring member 40. As shown in the enlarged view of FIG. 4B, the ring coupling member 6B winds the hard steel wire into a ring shape a plurality of times as in the ring member 40. A plurality of locations are bound by a binding means 6Ba such as a clip at a predetermined interval in the circumferential direction.

  FIG. 5 is a perspective view of the debris flow blocking device 1 configured as described above, partially omitted from the situation where the river R is installed.

  At the installation site, concrete foundations, that is, anchorage K, are constructed on both banks of the river channel R, and the main rope 2 is inserted and inserted into the guide pipe Kp provided in the anchorage K from the front side. A predetermined tension is applied by being pulled by a jack on the opposite side, and fixing is performed while this tension is maintained.

  The ring net 4 suspended from the main rope 2 via the suspension rope 3 closes the river channel cross section in the width direction, and the lower portion 42 that reaches the river bed in the vertical direction is folded back toward the upstream side. It is spread to.

  The rope net 5 connected to the folded ring net lower part 42 is extended to the upstream side of the river bed, fixed to the river bed by anchor pins, and further connected to the upstream end of the rope net as required. The anchor rope 51 is further fixed to the river bed on the upstream side. If necessary, the side portion of the ring net 4 is coupled to an anchor rope fixed to the river bank.

  When the upstream end portion of the rope net 5 is placed at a river bed location corresponding to the vertically lower position of the exit end of the guide pipe Kp, the positional relationship of each member is expressed as follows in terms of specific numerical values. The That is, the ring net width is about 30 m to match the riverbed width, the vertical distance from the exit end of the guide pipe Kp to the riverbed R is about 7.6 m, the length of the suspension line is about 2.7 m, and the maximum droop of the main line 2 When the descending distance is about 3.8 m vertically downward from the guide pipe exit end, the distance from the upstream end of the rope net 5 to the downstream end of the ring net river spreading part 42 is about 7 m. The vertical distance from the downstream end of the extended portion 42 to the upper end of the ring net is about 1.6 m, and the horizontal distance is about 5.7 m. At that time, the connecting member 6 is positioned at a height of about 1 m from the river bed so that an operator standing on the river bed can easily work.

  The specific numerical values described above are merely examples, and it is obvious that various numerical values can be changed according to the situation. For example, when focusing on the width of the riverbed, the width of the riverbed is actually in the range of about 20-50 m, but the above values take into account the actual width of the riverbed and the amount of debris to be captured It is set assuming

  The connection of the upper and lower adjacent rings 40 by the connecting member 6 may be performed at two or more locations in the ring net 4, and FIGS. 8 and 9 show another connection above the connection location 60 shown in FIG. The case where the location 61 is provided is shown.

  FIG. 6 is a view of the debris flow blocking device 1 installed as described above blocking the debris flow and capturing the debris S from the downstream side of the debris flow blocking device. In this figure, the ring net 4 is schematically shown. However, the ring net 4 that has received impact energy from the earth and stone S has its ring member 40 pulled at the ring connecting portion as shown in FIG. Absorb most of the impact energy.

  The captured sedimentary stone S is eliminated as follows. First, all the connecting members 6 at the locations indicated by chain lines LL are released by the operator, and the ring net 4 is separated into the upper ring net portion and the lower ring net portion at the same location.

  The lower ring net part after the separation is extended on the river bed, and the upper ring net part is temporarily hung on the suspension rope 7 extended between the anchorages K as shown in FIG. In this way, a large space is provided below the upper ring net portion so as to be accessible from the downstream side to the sedimentary stone S, and the heavy stone J introduced to the downstream side removes the debris from the river bed.

  After the debris is removed, the upper ring net portion hung on the suspension rope 7 is removed from the suspension rope and suspended from the main rope 2, and then the ring member at the lower end row of the upper ring net portion; The ring members in the upper end row of the lower ring net raised from the river bed are connected to each other by the connecting member 6 as in the state before separation, and thus the debris flow blocking device 1 is restored.

  When the ring net 4 is reduced in width by the impact of earth and stone, prior to the connection of the upper and lower ring net parts, a ring member is added to the side to make the width that can close the river channel and the above Are connected.

  As mentioned above, the main work for stone removal was explained, but the following further measures are taken according to the situation of the debris captured by the ring net.

  For example, when the debris flow passes through the side of the ring net 4 and circulates downstream, the downstream side of the ring net is partially or entirely covered with debris. As a result, at least the periphery of the connecting member 6 (hereinafter, the shackle 6A1 will be described as an example of the connecting member 6) is exposed.

  In a state where the ring net 4 captures the debris, the ring net bulges greatly downstream, so the main rope 2 is pulled obliquely downward with a strong force through the suspension rope 3 and is bent into an arc shape and has tension. It is in a state. If the connection of the ring member by the shackle 6A1 is released in this state, the tension of the main rope 2 is released, the main rope bounces back to the initial position before the debris flow occurrence, so-called main ring buckling occurs, Invite dangerous situations. Further, even during the disconnection work of the ring member, the tension force applied to the main rope 2 is transmitted to the shackle 6A1 through the ring net portion, and a tensile force is generated between the ring members connected by the shackle. Because it works, it makes the connection release work difficult. In order to prevent such buckling of the main rope or to prevent the tension of the main rope from exerting on the shackle, an appropriate number of fixing wire ropes are attached to the main rope 2 prior to releasing the connection of the ring member. One end (for example, φ9 to 14 mm) is attached, and the other end is fixed to an appropriate place on the river bed or the riverbank with an anchor, so that the main rope 2 is maintained in an arcuate state.

  Although the influence of the main rope 2 in a tensioned state can be eliminated by the installation of the fixing wire rope, the ring net 4 is also given a large amount of energy from the captured debris, and therefore will be described with reference to FIG. As described above, the ring members 40 are in a state of being attracted to each other with a large force at the connecting portion. The large pulling force accompanying this pulling inevitably acts on the shackle 6A1 and makes it difficult to disconnect the shackle.

  In order to solve such a problem, a traction / pulling release device 8 as shown in FIGS. 8 and 9 is used. A commercially available lever block that can perform traction and traction release gently can be applied as the traction / traction release device. The case where the lever block is applied will be described as an example. In FIG. 8, first, one hook 8a provided in the lever block 8 is the ring member 40a of the two ring members 40a and 40b to be disconnected. The ring member 40c adjacent to the outside is hooked, and the other hook 8b is hooked to the ring member 40d adjacent to the outside of the ring member 40b. Both ring members 40c and 40d are in a symmetrical position with respect to the shackle 6A1a involved in the release of the connection. It is preferable to select the circumscribed ring members 40c and 40d having such a symmetrical positional relationship as a target for hooking the hooks 8a and 8b of the lever block. However, in some cases, the other two circumscribed ring members not having the symmetrical positional relationship are selected. May be selected, or a ring member further outside these circumscribed ring members may be selected. The term “outside” as used herein means that the shackle that is involved in the release of the connection is located relatively far from the center when viewed from the center. .

  After setting the lever block 8 as described above, the lever 8c of the lever block is operated, and the circumscribed ring members 40c and 40d are pulled toward each other. As a result, the tensile force exerted on the shackle 6A1a is eliminated, and the shackle 6A1a can be easily removed.

  After removal of the shackle 6A1a, the pulling restraint between the circumscribed ring members 40c and 40d by the lever block 8 is gradually released by operating the lever 8c, and the support of the debris by the ring members 40a and 40b is lost. At that time, if the natural stable state of the accumulated debris cannot be obtained and collapse is expected, some of the debris near the ring members 40a and 40b is manually or heavyly used before the lever block 8 is removed. So that a stable state is obtained. The lever block 8 is removed after it has been confirmed that the accumulated debris is not deformed and does not pose a danger to the operator.

  Next, the adjacent shackle 6A1b is decoupled in the same procedure as described above. In this way, the same operation is sequentially performed on all the shackles at the connection location 60. Shackle removal can be done from one edge of the ring net to the other edge, or it can start simultaneously from the left and right ends of the ring net and advance to the center, or start from the center and advance left and right. May be. In the figure, the chain line indicates the attachment position of the lever block 8 to each shackle. In this way, the upper net portion and the lower net portion are separated, and the lower net portion is spread on the river bed as described above.

  When there is another connecting portion 61 above, the shackle is removed at the same location. If the connecting member 6 has already been removed at the connecting point 60, the work at the connecting point 61 does not necessarily require the traction / pulling release device 8, but first the work at the connecting point 61 is performed. When performing, it is necessary to use the same traction / pulling release device. The case where the operation at the connection point 61 is performed first is when the trapped debris has reached the upper range of the ring net 4. At this time, the work at the upper connection point 61 reduces the accumulation height of the debris to an appropriate level, and then the work at the lower connection point 60 is performed.

  When the removal work at both the connecting points 60 and 61 is completed, the intermediate ring net portion 43 is removed and moved to a place where there is no hindrance to the stone removal work. It becomes accessible.

  Further, in addition to the connection points 60 and 61 described above, the connection between the ring member at the uppermost end of the ring net 4 and the suspension cable 3 can be performed by a connecting means that can be released. After releasing the connection at the connection point 60 and / or the connection point 61 by the above, if the connection between the ring member at the uppermost end and the suspension rope is released, both from the main rope and the lower ring net portion The released intermediate ring net portion can be moved from the debris accumulation location to a location where there is no hindrance to the debris removal operation, so that a wide destone removal work space can be taken in the height direction with respect to the accumulated debris.

  The stone removal work from the downstream side may be performed simultaneously with removing the shackle, or after removing all the shackles, the remaining net part suspended from the main rope is lifted or rolled up, or the above It may be performed after removing the middle ring net part. Which one to select depends on the state of sedimentation of the captured debris.

It is an expanded view of the debris flow blocking device according to the present invention. It is a fragmentary figure which shows the combined state of the ring member of a ring net, (A) is a state before a ring net receives an impact, (B) is deformed in order to absorb impact energy when a ring net receives an impact. It is a figure which shows a state. It is a figure which shows the shackle as a connection member, (A) is a figure which shows the state which connected the ring member using this shackle, (B) is a perspective view of a shackle, (C) is a perspective view of a double shackle. . It is a figure which shows the small diameter ring coupling member as a connection member, (A) is a figure which shows the state which connected the ring member using this small diameter ring coupling member, (B) is a detailed perspective view of a small diameter ring coupling member. . It is a fragmentary perspective view which shows the state which installed the debris flow blocking device by this invention. It is the schematic front view which looked at the state after the debris flow blocking device of FIG. 5 blocked the debris flow from the downstream side. It is a schematic front view similar to FIG. 5 which shows the debris flow blocking device made into the state which can remove sedimentary debris. FIG. 6 is a partial plan view of a ring net showing another embodiment of the present invention. It is a schematic side view of the apparatus when a debris flow blocking device is configured using the ring net shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Debris flow blocking device 2 Main rope 3 Suspension rope 4 Ring net 40 Ring member 5 Rope net 6 Connecting member 6A1 Shackle 6A2 Double shackle 6B Small diameter ring coupling member 7 Suspension rope 8 Towing and traction release device (lever block)
60,61 Connection point J Heavy machinery K Foundation (Anchorage)
R Riverbed S Sediment

Claims (8)

A main rope spanned across the valley above the valley, and a large number of ring members sequentially connected in length and breadth to form a net, suspended from the main rope, crossing the valley and the main rope A method of removing trapped debris in a debris flow damming device that has a ring net stretched between the river bed below the main rope, blocks the debris flow flowing down from the upstream by the ring net, and traps debris There,
The ring member row between the two adjacent rows in the vertical direction of the ring member row in the height direction of the suspended ring net can be connected to and disconnected from each other. Connected by members,
When the debris captured by the ring net is removed, the connection between the ring members by the connecting member is released, the ring net is separated into upper and lower parts, and the work from the downstream side with respect to the captured debris between the upper and lower ring net portions Forming a space,
The method for removing trapped debris in a debris flow damming apparatus, wherein the trapped debris is removed from the downstream side of the ring net.   Prior to releasing the connection between the ring members, a main rope fixing wire rope is attached to the main rope, and the main rope is maintained in a posture in which the ring net is held when capturing debris. Item 2. A method for removing captured debris according to Item 1.   When releasing the coupling between the ring members by the connecting member, each one ring member located outside each of the two ring members to be disconnected is selected, and these two outer ring members are brought close to each other. A traction / tension release device that can be pulled and released so as to be separated is attached between these two outer ring members, and the outer ring members are brought closer to each other by the traction operation of the traction / tension release device. 3. The method for removing trapped debris according to claim 1, wherein the connection member is released by removing tension force acting on the connecting member.   Ring member rows to be connected and disconnected according to the pile height of the debris captured by the ring net by providing two or more horizontal ring member rows connected by the connecting member in the vertical direction in the ring net The method for removing captured debris according to any one of claims 1 to 3, wherein:   The method for removing stones according to any one of claims 1 to 4, wherein an upper ring net portion of the separated ring net is lifted upward and suspended on a suspension rope stretched above the ring net. A main rope that crosses across the valley above the valley, and a large number of ring members are connected in series vertically and horizontally to form a net, suspended from the main rope, crossing the valley, and the main rope and this A debris flow blocking device having a ring net stretched between the riverbed below the main rope,
The ring members between two adjacent rows in the horizontal direction in the middle of the ring net in the height direction of the ring net suspended from the main rope are coupled and released from each other. The debris flow blocking device is connected by a connecting member capable of performing   The debris flow blocking device according to claim 6, wherein the coupling member is a shackle composed of a shackle body and a shackle bolt.   7. The small-diameter ring coupling member, wherein the coupling member is formed by winding a high-strength wire rod in a ring shape a plurality of times and binding the formed strand wire bundle at one or more locations with a fastening member. Debris flow blocking device as described in 1.

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