JP6070038B2 - Rockfall protection net - Google Patents

Description

  The present invention relates to a rockfall protection net and a rockfall protection method for receiving rockfalls such as rockfalls, avalanches and debris flows (hereinafter simply referred to as rockfalls).

  As a disaster countermeasure due to falling rocks, a plurality of struts erected on the slope with an interval in the width direction of the slope, a main rope stretched between the upper ends of the plurality of struts, and a mountain side end on the main rope A main mesh body laid on the slope, and an opening for falling rocks is formed between the mountain side end of the main mesh body and the slope, and the main mesh body is formed from the opening. A so-called pocket-type rockfall protection net has been widely implemented by introducing rockfalls between slopes and capturing them to prevent damage caused by rockfalls on houses, roads, and railways on the sloped valley side. (For example, refer to Patent Document 1).

  On the other hand, as the pocket-type rock fall protection net, a pair of pillars erected so as to be able to tilt in the vertical direction in the width direction of the slope, auxiliary pillars attached so as to project in a branch shape from the valley side of the pillars, Attached to the main rope stretched between the tops of a pair of struts and attached to a horizontal main rope stretched between the tops of the auxiliary struts, and fixed to the slope with ropes at both ends A device having a pocket metal mesh is also proposed (see, for example, Patent Document 2).

  In addition, the mesh body may be a rhombus metal mesh, a plurality of wirings engaged with each other and connected on the surface, or a loop connected to each other to connect a plurality of coils in parallel. And the like using a coil wire mesh is proposed (see, for example, Patent Documents 3 and 4).

JP 7-42117 A JP 2010-112103 A JP 2006-152797 A Japanese Patent No. 4187350

  By the way, the rockfall protection net described in Patent Document 1 is currently widely implemented. However, in rockfalls having sharp corners, the rockfalls may break through the mesh body and fall to the valley side, and further improvement is desired. It was.

  On the other hand, as described in Patent Document 2, when a hook-shaped wire mesh is provided so as to close the opening of the pocket-shaped wire mesh, falling rocks are received by the hook-shaped wire mesh and the kinetic energy is absorbed, Since it is introduced, it can be effectively prevented from penetrating through the pocket metal mesh. However, in the rock fall protection net described in Patent Document 2, the auxiliary struts are provided so as to protrude in a branch shape from the trough side of the struts, and the pocket-shaped wire net is attached to the horizontal main rope stretched between the tops of the auxiliary struts. Therefore, there is a problem that the structure becomes complicated as much as the auxiliary struts are provided.

  An object of the present invention is to provide a rockfall protection net and a rockfall protection method that can effectively prevent rockfalls from penetrating and that have a simple configuration.

  A rockfall protection net according to the present invention includes a plurality of struts erected on the slope at intervals in the width direction of the slope, a main rope stretched between upper ends of the plurality of struts, and the main rope. A rockfall protection net that has a main mesh body laid on the slope and connected to and supports the mountainside end, and an opening for falling rocks is formed between the mountainside end of the main mesh body and the slope. The upper rope connected to and supported by the auxiliary rope or the main rope stretched between the upper ends of the columns, and the upper rope connected to and supported by the upper rope from the slope of the auxiliary rope or the main rope so as to close the opening. It was provided hanging down.

  In this rockfall protection net, the upper mesh body is hung from the auxiliary rope or main rope of the opening to the slope side so as to close the opening for introducing rockfall, so the rockfall is temporarily received by the upper mesh body. Since the kinetic energy is absorbed and then introduced between the main mesh body and the inclined surface, even when the falling speed of the falling rock is high, it is possible to effectively prevent a problem that the falling rock penetrates the main mesh body. In addition, since the upper net can absorb kinetic energy and prevent damage to the main net, it is only necessary to replace the upper net in repair work after falling rocks, and it is not necessary to replace the main net. , Can reduce the cost of repair work. The lower end of the upper mesh may be placed on the slope, but after the kinetic energy of the fallen rock is absorbed by the upper mesh, the fallen stone is introduced between the main mesh and the slope. It is preferable that the upper mesh member is arranged so that a certain gap is formed between the lower end portion and the inclined surface.

  Here, as the upper mesh body, it is preferable to use a coil metal mesh in which a plurality of coils are connected in parallel by mutually engaging loops. The coil wire mesh having such a configuration is preferable because the metal wire is likely to extend in the longitudinal direction of the coil and can effectively absorb the kinetic energy of falling rocks, although the manufacturing cost is somewhat higher than that of the diamond wire mesh.

  A connection fitting is fixed to the upper ends of the plurality of support columns, an auxiliary rope is stretched on the connection fitting, and the upper end of the upper mesh body is connected to and supported by the auxiliary rope so as to close the opening. It is a preferred embodiment that the upper mesh body is provided so as to hang down toward the slope side. In this case, since the upper mesh body is supported by an auxiliary rope provided separately from the main rope, it is possible to construct the main mesh body and the upper mesh body independently of each other. It can be improved.

  A brake bracket is slidably attached to the middle of the column along the column, and as a suspension rope that supports the column, one end is fixed to the slope on the mountain side of the column, and the other end is connected to the brake bracket, It is also a preferred embodiment to provide an auxiliary hanging rope that is movably hooked to the connecting metal part in the middle. In this case, it is possible to effectively suppress the falling of the column to the valley side when a large rock fall is received. That is, when a load in the direction of falling to the valley side acts on the support column, a pulling force is applied to the auxiliary suspension rope, and the braking bracket applies a certain sliding resistance to the upper end side of the support column by this pulling force. By sliding, it is possible to prevent the column from falling to the valley side by the braking force between the bracket and the column.

  The rock fall protection method according to the present invention includes a main net-like body laid on the slope so that an opening for rock fall introduction is formed between the mountain side end and the slope, and from the upper part of the opening toward the slope side. Using an upper mesh made of a coiled wire mesh in which coils are connected in parallel, and after receiving a fall rock by the upper mesh, the fall rock is introduced between the main mesh and the slope from the opening. The rock is held by the main mesh.

  In this rock fall protection method, the upper mesh body is hung from the upper part of the opening to the slope side so as to close the opening for introducing rock fall, so once the fall rock with a fast fall speed is received by the upper mesh body. Then, after absorbing the kinetic energy, it can be introduced between the main mesh body and the slope, and the problem of falling rocks penetrating the main mesh body can be effectively prevented. In addition, since the upper net can absorb kinetic energy and prevent damage to the main net, it is only necessary to replace the upper net in repair work after falling rocks, and it is not necessary to replace the main net. , Can reduce the cost of repair work. Moreover, since a coil wire mesh is used as the upper mesh body, the manufacturing cost is slightly higher than that of the rhombus wire mesh, but the upper mesh body tends to extend in the longitudinal direction of the coil, effectively reducing the kinetic energy of falling rocks. Since it can absorb, it is preferable.

  According to the rock fall protection net and the rock fall protection method according to the present invention, the upper mesh is suspended from the auxiliary rope or the main rope of the opening to the slope side so as to close the opening for falling rock introduction, The rock fall is once received by the upper mesh body, and its kinetic energy is absorbed and then introduced between the main mesh body and the slope, so even if the fall speed of the fall rock is high, the fall rock penetrates the main mesh body. Defects can be effectively prevented. In addition, since the upper net can absorb kinetic energy and prevent damage to the main net, it is only necessary to replace the upper net in repair work after falling rocks, and it is not necessary to replace the main net. , Can reduce the cost of repair work.

Perspective view of the falling rock protection net and its reinforcement structure Perspective view of the falling rock protection net and its reinforcement structure Longitudinal side view of the falling rock protection net and its reinforcement structure Side view of the main part near the column Rear view of the main part near the column FIG. 3 equivalent view of a reinforcing structure of another configuration FIG. 3 equivalent view of a reinforcing structure of another configuration (A) is explanatory drawing of a side buffer means, (b) is explanatory drawing of the side buffer means of another structure. Side view of the connecting bracket and other parts of other configurations XX sectional view of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 to 5, the rock fall protection net 10 includes a main mesh body 11 laid on a mountain slope S, and an opening 12 for introducing rock fall between the mountain end of the main mesh body 11 and the slope S. Is formed with a fixing means 20 for fixing the main mesh body 11 to the slope S, and a reinforcing structure 40 for reinforcing the main mesh body 11 and the fixing means 20. In this embodiment, the rock fall protection net 10 is constructed on the slope S on which the frame is formed, but it is also possible to construct it on the slope of the mountain where the frame is not formed.

  The main mesh body 11 is composed of a rhombus wire mesh. As the rhombus wire netting, a known configuration in which a metal wire is knitted so that rhombus meshes are continuously arranged can be adopted. For example, a metal wire having a diameter of 3.2 mm is used, and a rhombus shape of 50 × 50 mm square is used. A rhombus wire mesh with continuous mesh can be used. However, the diameter of the metal wire which comprises a rhombus metal-mesh and the magnitude | size of a rhombus can be arbitrarily set according to the magnitude | size of the falling rock R to catch. In addition, the rhombus metal mesh is assembled in a size corresponding to the size of the slope S by connecting unit rhombus metal mesh of a certain size vertically and horizontally at the site. Furthermore, the main net-like body 11 can be constituted by a wire mesh such as a coil wire mesh, for example, in addition to the rhombus wire mesh, or can be constituted by using a plurality of types of wire meshes in combination.

  The fixing means 20 will be described. A plurality of bracket members 21 are anchors 22 at intervals in the width direction (left-right direction) of the slope S in the middle in the height direction of the slope S where the rock fall R may occur. The support member 23 is fixedly supported on the bracket member 21 so that the support member 23 can be tilted to the valley side around the support shaft 24 in the left-right direction at the lower end portion thereof. Anchors 25 are fixed at positions spaced apart from the pillars 23 to the mountain side so as to correspond to the pillars 23, and between the mounting pieces 26 provided at the upper ends of the pillars 23 and the anchors 25 corresponding to the pillars 23. The suspension rope 27 is stretched, and the suspension rope 27 restricts the tilting of the column 23 around the support shaft 24 toward the valley side, so that the angle formed by the column 23 with respect to the slope S is maintained at a substantially right angle. It is configured. A turnbuckle 28 is interposed in the suspension rope 27, and the length of the suspension rope 27 is adjusted by the turnbuckle 28, so that the inclination angle of the column 23 can be adjusted. However, it is also possible to place the column 23 upright on the slope S by embedding the lower portion of the column 23 in the slope S.

  The support column 23 is made of H-shaped steel, and is basically constructed at a location where the falling rock R is difficult to pass through, so that the supporting column 23 is not damaged by the collision with the falling rock R. Moreover, even if it is a case where falling rock R collides with the support | pillar 23 by standing upright on the bracket member 21 so that the support | pillar 23 can tilt to the trough side, it is comprised so that breakage of the support | pillar 23 may be prevented. Yes. As the support | pillar 23, what consists of a square steel pipe and a round steel pipe other than H-section steel is also employable. The length and cross-sectional dimensions of the support pillars 23 are appropriately set in consideration of the size of the falling rock R to be received, the inclination angle and length of the slope S, the dimensions of the main mesh body 11, and the like.

  A guide member 30 made of a U-bolt is attached to the valley side surface of the upper end portion of each column 23, and a main rope 31 is inserted into the guide member 30 of each column 23 so that the main rope extends between the upper end portions of the plurality of columns 23. 31 is stretched, and both ends of the main rope 31 are fixed to the slope S on the left and right sides of the main net 11 by anchors 32. A turnbuckle 33 is interposed between the main rope 31 and the anchor 32, and the turnbuckle 33 is configured so that the tension of the main rope 31 can be adjusted. The main rope 31 is connected to the mountain end of the main mesh body 11 via a connecting coil 34, and an opening 12 for falling rocks is formed between the mountain end of the main mesh body 11 and the slope S.

  A plurality of horizontal ropes 35 are provided in the lower half of the main mesh body 11 at intervals in the inclination direction of the slope S, and both end portions of the horizontal rope 35 are led out from the main mesh body 11 to the side of the slope S. It is fixed with an anchor 36. Vertical ropes 37 are provided at regular intervals in the left-right direction between the main rope 31 and the lowermost horizontal rope 35 at the laying position of the main net-like body 11, and the clip 38 at the crossing position between the horizontal rope 35 and the vertical rope 37. Is connected to the main net 11.

  As shown in FIGS. 1 to 5, the reinforcing structure 40 includes a connection fitting 41 that is detachably fixed to the upper end portion of the support post 23, an auxiliary rope 42 that is stretched over the connection fitting 41 of the plurality of support posts 23, and an auxiliary rope. The upper net 43 is suspended from the auxiliary rope 42 toward the slope S side so that the upper end portion is connected to and supported by 42 and the opening 12 for introducing rock fall is closed, and the impact load acting on the column 23 And a buffer means 50 for buffering. However, although the auxiliary rope 42 is stretched around the connection fitting 41, it is also possible to provide a guide member made of U-bolts or the like without using the connection fitting 41 at the upper end of the support post 23 in the same manner as the main rope 31. It is.

  The connecting metal fitting 41 has a pair of divided metal fittings 45A and 45B having a substantially U-shape in plan view that can be externally fitted to the column 23, and a pair of divided metal fittings 45A and 45B that are externally fitted to the column 23 to form a square shape. A connecting bolt 46 that is connected in a combined state, and a fixing bolt 47 that fixes a metal fitting body 45 formed by combining a pair of divided metal fittings 45 </ b> A and 45 </ b> B so as not to move along the column 23. . When the connecting bracket 41 is fixed to the column 23, the pair of divided brackets 45A and 45B are connected to the peak side and the valley side of the column 23 with the pair of divided brackets 45A and 45B. Then, the connecting metal fitting 41 is fixed to the upper end portion of the support post 23 by tightening the fixing bolt 47 in a state where the height of the metal fitting body 45 composed of both divided metal fittings 45A and 45B is adjusted with respect to the support post 23. A handle 48 made of a wire is fixed to the connection fitting 41, and the downward movement of the connection fitting 41 can be reliably prevented by engaging the handle 48 with a U bolt 70 fixed to the column 23. ing.

  A mounting piece 49 that protrudes toward the mountain side is provided upright at the center in the width direction of the split metal fitting 45B on the mountain side, and a pair of upper and lower mounting holes are formed in the mounting piece 49. An auxiliary rope 42 is inserted into the upper mounting hole, and both ends of the auxiliary rope 42 are fixed to the connecting brackets 41 of the columns 23 on both the left and right ends. The auxiliary ropes 42 are stretched over the plurality of columns 23 in an erected manner. Has been.

  In the present embodiment, the metal fitting body 45 is divided into the divided metal fittings 45A and 45B and the connecting bolt 46 so that the metal fitting main body 45 can be retrofitted to the support pillar 23. Any configuration can be adopted as long as it exists. For example, a metal fitting body having a cross-sectional shape that can be fitted onto the column 23 and adapted to the cross-sectional shape of the column 23, such as a square tube-shaped metal fitting body made of a square steel pipe or the like fitted on the column 23, is used as a fixing bolt. 47 can be fixed to the upper portion of the support 23. Further, instead of the connecting metal fitting 41, a pair of divided metal fittings 72A and 72B having a shape along the support column 23 and a pair of these dividing metal fittings 72A and 72B, as shown in FIG. 9 and FIG. A fixing bolt for fixing the connecting bolt 73 that is externally fitted to the support 23 and connected in a combined state and an H-shaped metal fitting body 72 formed by combining a pair of divided metal fittings 72A and 72B so as not to move along the support 23. 74 and a connecting piece 75 provided on the split metal fitting 71A so as to protrude upward can be employed. In this connection fitting 71, since the fixing bolt 74 is disposed between the flange portions of the support column 23, the protruding height of the mounting piece 49 is reduced while preventing the shackle 59, the auxiliary rope 42 and the fixing bolt 73 from interfering with each other. Further, the strength and rigidity of the mounting piece 49 against the impact load from the auxiliary rope 42 and the auxiliary suspension rope 52 can be improved. Moreover, it is preferable to connect the connecting piece 75 to the guide member 30 because the U-bolt 70 and the drilling process for attaching it to the support column 23 become unnecessary. Reference numeral 76 is an attachment hole formed in the upper part of the attachment piece 49 for attaching the auxiliary rope 42, and reference numeral 77 is an attachment formed in the lower part of the attachment piece 49 for attaching a shackle 59 described later. It is a hole.

  The upper rope 43 is connected to and supported by the auxiliary rope 42, and the upper mesh 43 is provided so as to close the opening 12 for falling rocks between the columns 23 at both left and right ends. The lower end is arranged slightly above the slope S, and the falling rock R is once received by the upper mesh 43 and then introduced between the main mesh 11 and the slope S through the opening 12. ing.

  The upper mesh 43 is composed of a plurality of coils 43a made of metal wires, and is constituted by a coil wire mesh formed by connecting a plurality of coils 43a in parallel by mutually engaging the loops of the coils 43a. The auxiliary rope 42 is inserted into the loop of the uppermost coil 43a and is connected to and supported by the auxiliary rope 42. The diameter of the metal wire constituting the coil 43a, the diameter of the loop of the coil 43a, the arrangement pitch, and the like can be appropriately set according to the size of the falling rock R to be received, for example, a metal wire having a diameter of 4.0 mm, A coil 43a in which a loop is formed with a pitch of 300 mm and a pitch of 100 mm can be employed. Although it is possible to transport the coil wire mesh manufactured at a factory or the like to the construction site, since the transportation cost becomes high, the coil 43a is transported to the construction site, and the loop of the coil 43a is formed at the construction site. Preferably, a plurality of coils 43a are connected in parallel so as to be engaged with each other. In addition, if the length of the coil 43a is increased, it becomes difficult to transport the coil 43a to the site. For example, a short unit coil having a length of 5 m is transported to the construction site, and a plurality of unit coils are installed at the construction site. It is also a preferred embodiment that the coils 43a of each stage are configured by connecting in series with a connecting metal fitting. Further, if the positions of the connecting portions of the left and right unit coils are arranged at the same position in the left and right direction in the upper and lower adjacent coils 43a, the strength of the coil wire mesh is lowered, so that the unit coils arranged adjacent to each other in the upper and lower directions are connected. It is preferable that the connecting portions are arranged in a staggered manner by arranging the portions in a position shifted by, for example, a half pitch in the left-right direction.

  In addition, although the upper mesh body 43 was comprised with the coil metal mesh, it can also be comprised with a rhombus metal mesh. Further, as in the reinforcing structure 40A shown in FIG. 6, instead of the upper mesh body 43, an upper mesh body 43A provided with a lower end portion provided on the slope S and hung to the valley side along the slope S is provided. Alternatively, as in the reinforcing structure 40B shown in FIG. 7, instead of the upper mesh 43, the upper mesh provided by extending the lower end along the slope S to the mountain side instead of being installed on the slope S. 43B may be provided. Further, a connecting rope is inserted into the lower end of the upper mesh 43, and both ends of the connecting rope are fixed to the slope S above the upper mesh 43 with anchors, and buffered at both ends of the connecting rope. A means may be provided so that a part of the load acting on the upper mesh 43 is received by the connecting rope while being buffered by the buffer means. Further, it is also preferable to provide a side rope in the vertical direction on the side of the upper mesh 43, fix the upper end of the side rope to the auxiliary rope 42, and fix the lower end to the slope S with an anchor. . Furthermore, the plurality of upper mesh bodies 43 are overlapped with each other without gaps and suspended on a common auxiliary rope 42, or the plurality of upper mesh bodies 43 are overlapped with a gap before and after and arranged in parallel. It is also possible to suspend them individually on the auxiliary ropes or to suspend them by arbitrarily combining the upper mesh bodies 43, 43A, 43B. Furthermore, the auxiliary rope 42 can be omitted, and the upper end portion of the upper mesh 43 can be connected and supported to the main rope 31 by a connecting coil or the like.

  The buffer means 50 includes a brake fitting 51 provided in the middle of the support 23 in the height direction, one end fixed to the slope S on the mountain side of the support 23 with an anchor, and the other end connected to the brake fitting 51. And an auxiliary suspension rope 52 that is movably hooked on the connection fitting 41.

  The brake bracket 51 is formed in a square shape by fitting a pair of divided brackets 53A and 53B having a substantially U-shape in plan view that can be externally fitted to the column 23, and the pair of divided brackets 53A and 53B to the column 23. A connection bolt 54 connected in a combined state, a metal fitting body 53 formed by combining a pair of divided metal fittings 53A and 53B in a square shape, and a braking bolt 55 for applying a braking force between the columns 23 are provided. In a state in which the divided metal parts 53A and 53B are externally fitted to the mountain side and the valley side of the support column 23, both the divided metal parts 53A and 53B are connected by the connecting bolt 54, and then the metal body 53 formed of the both divided metal parts 53A and 53B is connected to the support column 23. In a state where the height is adjusted, the brake bolt 55 is fastened with a constant torque by a torque wrench to be attached to the middle portion of the column 23. In order to reduce the number of parts as much as possible, the brake fitting 51 has the same structure as the connection fitting 41, but a structure different from that of the connection fitting 41 can also be used. In the present embodiment, the metal fitting body 53 is divided into the divided metal fittings 53A and 53B and the connecting bolt 54 so that the metal fitting main body 53 can be retrofitted to the support pillar 23. A metal fitting body having a cross-sectional shape that conforms to the cross-sectional shape of the column 23, for example, a square tube-shaped metal fitting body made of a square steel pipe or the like that is externally fitted to the column 23 is adopted, and this is fixed to the middle part of the column 23 by the brake bolt 55 You can also. Moreover, the thing of the same structure as the connection metal fitting 71 can also be employ | adopted, and the thing different from the connection metal fittings 41 and 71 can also be employ | adopted. Further, as the brake fitting 51, it is possible to omit the handle 48 and the connecting piece 75 of the connecting fittings 41 and 71, or to omit the lower mounting hole of the attaching piece 49.

  A mounting piece 56 that protrudes to the mountain side is provided upright at the center of the mountain-side split metal fitting 53B in the width direction, and a pair of upper and lower mounting holes are formed in the mounting piece 56. Two auxiliary suspension ropes 52 are stretched in a substantially V shape in plan view with respect to one column 23, one end of the auxiliary suspension rope 52 is fixed to the slope S with an anchor 57, and the other end of the auxiliary suspension rope 52. The portion is connected to a shackle 58 attached to the upper mounting hole of the brake fitting 51, and the middle portion of the auxiliary suspension rope 52 is inserted into a shackle 59 attached to the lower attachment hole of the connecting fitting 41. A turnbuckle 52a is interposed in the auxiliary suspension rope 52, and the inclination angle of the column 23 with respect to the slope S can be adjusted by adjusting the length of the auxiliary suspension rope 52 with the turnbuckle 52a. In addition, although the two auxiliary suspension ropes 52 were provided with respect to one support | pillar 23, it is also possible to provide only one.

  In this buffering means 50, when the large falling rock R is received, when the suspension rope 27 is extended by the impact load of the falling rock R and the column 23 is tilted to the valley side around the support shaft 24, the auxiliary suspension rope The brake fitting 51 is moved to the upper side of the support post 23 by the tension acting on the support 52. At this time, a constant braking force is applied to the support fitting 23 according to the tightening force of the brake bolt 55. Therefore, the shock load of the falling rock R on the support column 23 is absorbed by the buffer means 50, and the damage of the support column 23 can be prevented. However, in the present embodiment, the buffer means 50 and the suspension rope 27 are used together. However, the buffer means 50 can be omitted, and the suspension 23 can be prevented from falling by the suspension rope 27 alone. It is also possible to prevent the column 23 from falling. It is also possible to omit the auxiliary rope 42 and the upper mesh 43 and provide the rock fall protection net 10 with only the buffer means 50 as the reinforcing structure 40.

  Further, in the rockfall protection net 10, as shown in FIG. 3, when a rockfall R occurs, the rockfall R is first received by the upper mesh 43, the upper mesh 43 is elongated, and the lower end of the upper mesh 43 is extended. The side is deformed to the valley side, and the kinetic energy of the falling rock R is absorbed, and then the falling rock R is introduced between the main mesh body 11 and the slope S from the opening 12, and the kinetic energy is further absorbed by the main mesh body 11. The falling rock R is held between the main mesh body 11 and the slope S.

  For this reason, even when the falling speed of the falling rock R is high, the falling rock R is once received by the upper mesh body 43 and absorbed, and then the falling rock R is introduced between the main mesh body 11 and the slope S. The problem that the falling rock R penetrates through the main mesh body 11 can be effectively prevented. Moreover, since the kinetic energy is absorbed by the upper mesh body 43 and damage to the main mesh body 11 can be prevented, only the upper mesh body 43 needs to be replaced in the repair work after falling rocks, and the main mesh body 11 is not necessarily replaced. Since it is not necessary, it is preferable because it can reduce the cost of repair work.

  It is also preferable to provide a side buffering means between the horizontal rope 35 and the anchor 36. Specifically, as in the side buffering means 60 shown in FIG. 8A, the horizontal rope 35 is divided into a main body rope 61 on the main mesh body 11 side and a side rope 62 on the anchor 36 side. The rope 61 and the side rope 62 are overlapped with each other by a predetermined length and coupled with a plurality of clips 63, and a locking member 64 for retaining the crimp is attached to the ends of the main body rope 61 and the side rope 62. When a large load is applied to the main rope 61, slippage occurs between the main body rope 61 and the side rope 62 and the impact acting on the lateral rope 35 can be absorbed. 8B, the lateral rope 35 is divided into a main body rope 66 on the main mesh body 11 side, an intermediate rope 67, and a side rope 68 on the anchor 36 side. The intermediate rope 67 is inserted into a ring member 69 made of a metal pipe that circulates in the shape of a coil for about one and a half times, and both ends are connected to each other. 68 is connected to the ring member 69, and when a large load is applied to the lateral rope 35, the intermediate rope 67 and the ring member 69 are linearly extended to absorb the impact acting on the lateral rope 35. be able to.

  The embodiment of the present invention has been described above. However, the present invention is not limited to the above-described embodiment, and it goes without saying that the configuration can be changed without departing from the gist of the present invention.

S slope 10 rockfall protection net 11 main mesh body 12 opening 20 fixing means 21 bracket member 22 anchor 23 support 24 support shaft 25 anchor 26 mounting piece 27 hanging rope 28 turnbuckle 30 guide member 31 main rope 32 anchor 33 turnbuckle 34 connection Coil 35 Horizontal rope 36 Anchor 37 Vertical rope 38 Clip 40 Reinforcement structure 41 Connection bracket 42 Auxiliary rope 43 Upper mesh 43a Coil 45 Metal body 45A Division metal fitting 45B Division metal fitting 46 Connection bolt 47 Fixing bolt 48 Handle 49 Attachment piece 50 Buffer means 51 Braking bracket 52 Auxiliary hanging rope 53 Bracket body 53A Split bracket 53B Split bracket 54 Connecting bolt 55 Braking bolt 56 Mounting piece 57 Anchor 58 Shackle 59 Shackle 40A Reinforcement structure 40B Reinforcement structure 43A Section mesh body 43B Upper mesh body 60 Side buffer means 61 Main body rope 62 Side rope 63 Clip 64 Locking member 65 Side buffer means 66 Main body rope 67 Intermediate rope 68 Side rope 69 Ring member 70 U bolt 71 Connecting bracket 72 Metal fitting body 72A Division metal fitting 72B Division metal fitting 73 Connection bolt 74 Fixing bolt 75 Connection piece 76 Installation hole 77 Installation hole

Claims (2)

A plurality of struts erected on the slope, spaced apart in the width direction of the slope, a main rope stretched between the upper ends of the plurality of struts, and a mountain side end connected to and supported by the main rope, A rock fall protection net having a main mesh body laid on the slope and having an opening for rock fall introduction between the mountain side end of the main mesh body and the slope;
From the auxiliary rope or the main rope to the slope side so as to close the opening portion, the upper mesh body having the upper end connected to and supported by the auxiliary rope or the main rope stretched between the upper ends of the support columns. set hanging,
A connection fitting is fixed to the upper ends of the plurality of support columns, an auxiliary rope is stretched on the connection fitting, and the upper end of the upper mesh body is connected to and supported by the auxiliary rope so as to close the opening. , The upper mesh body is hung toward the slope side,
A brake bracket is slidably attached to the middle of the column along the column, and as a suspension rope that supports the column, one end is fixed to the slope on the mountain side of the column, and the other end is connected to the brake bracket, Provided an auxiliary hanging rope that is movably hooked to the connecting bracket in the middle,
A rockfall protection net characterized by that.   The rock fall protection net according to claim 1, wherein a coil wire net in which a plurality of coils are connected in parallel by mutually engaging loops is used as the upper mesh body.

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