JP6070037B2 - Reinforcement structure of existing rockfall protection net - Google Patents

Description

  The present invention relates to a reinforcing structure and a reinforcing method for an existing rock fall protection net that catches fallen objects such as rock fall, avalanches, and debris flows (hereinafter simply referred to as rock fall).

  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, it is necessary to attach the auxiliary struts so as to protrude in a branch shape from the trough side of the struts, and the horizontal main rope stretched between the heads of the auxiliary struts has a pocket shape. Since it was necessary to attach a wire mesh, it could not be easily applied to an existing rockfall protection net. That is, to construct and reinforce the existing rockfall protection net like the rockfall protection net described in Patent Document 2, the auxiliary strut is fixed to the strut by welding or the like, and the main rope hanging on the strut is pocketed. Removing the metal wire mesh, attaching the pocket metal wire to the horizontal main rope stretched between the heads of the auxiliary struts, and reattaching the hook metal wire to the main rope from which the pocket metal wire is removed. Work is required.

  An object of the present invention is to provide a reinforcing structure and a reinforcing method for an existing rock fall protection net that can effectively prevent the fall of rock fall and can be easily applied to an existing rock fall protection net.

  The reinforcement structure of the existing rock fall 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, and a main rope stretched between upper ends of the plurality of pillars, An existing falling rock having a main net-like body connected to and supported by the main rope on the slope, and having an opening for falling rock between the mountain-side end of the main mesh and the slope. A reinforcing structure for a protective net, wherein the auxiliary rope stretched between the upper end portions of the support column or the main rope is connected to the upper end portion of the reinforcing net-like body so as to close the opening portion. The rope or the main rope is hung from the slope side.

  In this reinforcement structure, the reinforcement net-like body is connected and supported to the main rope that supports the main net-like body or an auxiliary rope separately stretched between the upper ends of the columns, so the configuration of the existing rock fall protection net can be changed. And a reinforcing mesh can be attached. In addition, since the reinforcing mesh is hung from the auxiliary rope or the main rope to the slope side so as to close the opening for introducing the falling rock, the falling rock is once received by the reinforcing mesh and its kinetic energy is reduced. Since it is introduced between the main mesh body and the slope after being absorbed, it is possible to effectively prevent a problem that the rock falls through the main mesh body even when the falling speed of the falling rock is high. Also, since the kinetic energy can be absorbed by the reinforcing mesh and damage to the main mesh can be prevented, it is only necessary to replace the reinforcing mesh in the repair work after falling rocks, and it is not necessary to replace the main mesh. , Can reduce the cost of repair work. The lower end of the reinforcing mesh may be placed on the slope, but after the kinetic energy of the falling rock is absorbed by the reinforcing mesh, the falling rock is introduced between the main mesh and the slope. It is preferable that the reinforcing mesh be disposed so that a certain gap is formed between the lower end portion and the slope.

  In the preferred embodiment, a coil wire mesh in which a plurality of coils are connected in parallel by mutually engaging loops is used as the reinforcing mesh. 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 connecting bracket is detachably fixed to the upper ends of the plurality of columns, an auxiliary rope is stretched on the connecting bracket, and the upper end of the reinforcing mesh is connected to and supported by the auxiliary rope, thereby closing the opening. As described above, it is a preferred embodiment that the reinforcing mesh body is provided so as to hang down toward the slope side. In this case, since the reinforcing net is supported by an auxiliary rope separately provided for the existing rock fall protection net, it is possible to prevent an excessive load from acting on the main rope.

  As an auxiliary suspension rope that reinforces the support column, it is preferable to provide an auxiliary suspension rope having one end fixed to the slope on the mountain side of the support and the other end connected to the connection fitting. In this case, it is possible to prevent the support column from falling sideways by providing the reinforcing net-like body with the auxiliary suspension rope.

  A brake bracket is slidably attached along the column in the middle of the column, and one end is fixed to the slope on the mountain side of the column as an auxiliary suspension rope to reinforce 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 fitting 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.

  A first method for reinforcing an existing rock fall protection net according to the present invention includes a plurality of struts erected on the slope and an upper end of the plurality of struts spaced apart in the width direction of the slope. A rope and a main net that is connected to and supported by the main rope on the mountain side, and an opening for introducing rock fall is formed between the mountain side of the main net and the slope. A method for reinforcing an existing rock fall protection net, wherein a reinforcing mesh member having an upper end connected to and supported by an auxiliary rope or a main rope stretched between upper ends of the support so as to close the opening. The auxiliary rope or the main rope is hung to the slope side.

  In this reinforcing method, since the reinforcing mesh is attached to the main rope that supports the main mesh, or the auxiliary rope separately stretched between the upper ends of the columns, without changing the configuration of the existing rock fall protection net, A reinforcing mesh can be attached. In addition, since the reinforcing mesh is hung from the auxiliary rope or the main rope to the slope side so as to close the opening for introducing the falling rock, the falling rock is once received by the reinforcing mesh and its kinetic energy is reduced. Since it is introduced between the main mesh body and the slope after being absorbed, it is possible to effectively prevent a problem that the rock falls through the main mesh body even when the falling speed of the falling rock is high.

  According to the second method for reinforcing an existing rock fall protection net according to the present invention, a plurality of pillars erected on the slope and spaced from each other in the width direction of the slope, A rope and a main net that is connected to and supported by the main rope on the mountain side, and an opening for introducing rock fall is formed between the mountain side of the main net and the slope. A method of reinforcing an existing rock fall protection net, wherein a connecting bracket is detachably fixed to upper ends of the plurality of columns, and then an auxiliary rope is stretched on the connecting bracket, and then an upper end of the auxiliary rope A reinforcing net-like body that is connected and supported is hung from the auxiliary rope to the slope side so as to close the opening.

  In this reinforcing method, the reinforcing mesh is attached to the auxiliary rope separately stretched between the upper ends of the columns, and therefore the reinforcing mesh can be attached without changing the configuration of the existing rock fall protection net. In addition, since the reinforcing mesh is hung from the auxiliary rope or the main rope to the slope side so as to close the opening for introducing the falling rock, the falling rock is once received by the reinforcing mesh and its kinetic energy is reduced. Since it is introduced between the main mesh body and the slope after being absorbed, it is possible to effectively prevent a problem that the rock falls through the main mesh body even when the falling speed of the falling rock is high. Furthermore, since the reinforcing net-like body is supported by an auxiliary rope separately provided for the existing rock fall protection net, it is possible to prevent an excessive load from acting on the main rope.

  According to the reinforcing structure and the reinforcing method of the existing rock fall protection net according to the present invention, the reinforcing net is connected to and supported by the main rope supporting the main net or the auxiliary rope separately stretched between the upper ends of the columns. Therefore, it is possible to attach the reinforcing mesh without changing the configuration of the existing rock fall protection net. In addition, since the reinforcing mesh is hung from the auxiliary rope or the main rope to the slope side so as to close the opening for introducing the falling rock, the falling rock is once received by the reinforcing mesh and its kinetic energy is reduced. Since it is introduced between the main mesh body and the slope after being absorbed, it is possible to effectively prevent a problem that the rock falls through the main mesh body even when the falling speed of the falling rock is high. Also, since the kinetic energy can be absorbed by the reinforcing mesh and damage to the main mesh can be prevented, it is only necessary to replace the reinforcing mesh in the repair work after falling rocks, and it is not necessary to replace the main mesh. , Can reduce the cost of repair work.

Perspective view of existing rockfall protection net and its reinforcement structure in construction Perspective view of existing rockfall protection net and its reinforcement structure in construction Longitudinal side view of existing rockfall 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.
First, the configuration of the existing rock fall protection net will be described.
As shown in FIGS. 1 to 5, the existing rock fall protection net 10 includes a main mesh body 11 laid on a mountain slope S, and an opening for introducing rock fall between the mountain side end of the main mesh body 11 and the slope S. 12 is formed with fixing means 20 for fixing the main net-like body 11 to the inclined surface S. In the present embodiment, the existing falling rock 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 inclination angle of the column 23 with respect to the slope S can be adjusted by adjusting the length of the suspension rope 27 by the turnbuckle 28. However, the present invention can be similarly applied to an existing rockfall protection net in which the lower part of the support 23 is embedded in the slope S and the support 23 is erected on 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.

  The present invention relates to a reinforcing structure 40 for the existing rock fall protection net 10 as described above, and the reinforcing structure 40 is configured as follows. In addition, if this reinforcement structure 40 is a pocket type lock net in which an opening 12 for falling rock is formed between the mountain side end portion of the main mesh body 11 and the slope S, an existing falling rock protection net having a configuration other than the above is used. It can also be applied to.

  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. 42, the upper end portion is connected and supported, and the reinforcement net 43 provided by hanging from the auxiliary rope 42 toward the slope S side so as to close the opening 12 for introducing the falling rocks, and the impact load acting on the column 23 And a buffer means 50 for buffering.

  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.

  As the connecting metal fitting 41, any structure can be adopted as long as it can be fixed to the existing support column 23. For example, as shown in FIG. 9 and FIG. 10, a pair of divided metal fittings 72A and 72B having a shape along the support column 23 and a pair of these divided metal fittings 72A and 72B are externally fitted to the support column 23. A connecting bolt 73 to be connected in a combined state, a fixing bolt 74 for fixing 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 column 23, and a divided metal fitting 71A A thing provided with the connection piece 75 provided in the shape protruding upwards can be adopted. 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. Further, it is preferable to connect the connecting piece 75 to the existing guide member 30 because the drilling process for attaching the U bolt 70 to the support column 23 is not necessary. 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 hole formed in the lower part of the attachment piece 49 for attaching a shackle 59 described later. It is.

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

  The reinforcing mesh 43 is composed of a plurality of coils 43a made of metal wires, and 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 reinforcement net-like body 43 was comprised with the coil metal mesh, it is also possible to comprise with a rhombus metal mesh. Further, as in the reinforcing structure 40A shown in FIG. 6, instead of the reinforcing mesh 43, a reinforcing mesh 43A is provided in which a lower end portion is installed on the slope S and is hung to the valley side along the slope S. Alternatively, as in the reinforcing structure 40B shown in FIG. 7, instead of the reinforcing mesh 43, the reinforcing 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 through the lower end of the reinforcing mesh 43, and both ends of the connecting rope are fixed to the slope S above the reinforcing mesh 43 with anchors, and buffered at both ends of the connecting rope. Means may be provided so that part of the load acting on the reinforcing mesh 43 is received by the connecting rope while being buffered by the buffer means. Furthermore, it is also preferable that a side rope in the vertical direction is provided on the side of the reinforcing mesh 43, the upper end of the side rope is fixed to the auxiliary rope 42, and the lower end is fixed to the slope S with an anchor. . Furthermore, a plurality of reinforcing mesh bodies 43 are overlapped with each other without gaps and suspended on a common auxiliary rope 42, or a plurality of reinforcing mesh bodies 43 are overlapped with a gap before and after and arranged in parallel. It is also possible to individually suspend from the auxiliary rope or to suspend the reinforcing nets 43, 43A, 43B in any combination. Furthermore, if the strength of the main rope 31 permits, the auxiliary rope 42 can be omitted and the upper end portion of the reinforcing 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 metal fitting 51 has the same structure as the connection metal fitting 41. However, any brake metal can be used as long as it can be attached to the existing support post 23. For example, one having the same structure as the connection fitting 71 can be adopted, or one having a configuration different from that of the connection fittings 41 and 71 can be 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 may be omitted to prevent the support column 23 from falling down with the suspension rope 27 alone as in the existing rock fall protection net 10. It is possible to remove the suspension rope 27 after the buffer means 50 is installed, and to prevent the column 23 from falling with the buffer means 50 alone. Further, it is possible to omit the auxiliary rope 42 and the reinforcing net 43 and provide only the buffer means 50 as the reinforcing structure 40 to the existing rock fall protection net 10.

  When the reinforcing structure 40 is assembled to the existing rock fall protection net 10, the connection fitting 41 and the brake fitting 51 are assembled to the column 23 of the existing rock fall protection net 10, and the auxiliary rope 42 is stretched on the connection fitting 41. The reinforcing net-like body 43 is constructed on 42, and a pair of anchors 57 are constructed corresponding to the pillars 23 on the slope S on the mountain side of the pillars 23. One end of the anchor 57 is interposed between the anchor 57 and the brake fitting 51. The other end is connected to the brake fitting 51, and the auxiliary suspension rope 52 that is movably hooked to the connection fitting 41 is stretched without changing the configuration of the existing falling rock protection net 10 at all. The reinforcing structure 40 can be easily assembled to the existing rock fall protection net 10.

  In addition, in the existing rock fall protection net 10 reinforced by the reinforcing structure 40, when the rock fall R occurs, the fall rock R is first received by the reinforcement mesh 43, and the reinforcement mesh 43 extends as shown in FIG. The lower end side of the reinforcing mesh 43 is deformed to the valley side, the kinetic energy of the falling rock R is absorbed, and then the falling rock R is introduced from the opening 12 between the main mesh 11 and the slope S. Further, the kinetic energy is absorbed, and the falling rock R is held between the main mesh body 11 and the slope S.

  For this reason, even if the falling speed of the falling rock R is fast, the falling rock R is temporarily received by the reinforcing mesh 43 and absorbed, and then the falling rock R is introduced between the main mesh 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 reinforcing mesh 43 and damage to the main mesh 11 can be prevented, only the reinforcing mesh 43 needs to be replaced in the repair work after falling rock, and the main mesh 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 existing rock fall protection net 11 main mesh body 12 opening 20 fixing means 21 bracket member 22 anchor 23 strut 24 support shaft 25 anchor 26 attachment 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 Reinforcement network 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 Buffering means 51 Braking Bracket 52 Auxiliary Suspension Rope 52a Turn Buckle 53 Bracket Main 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 Reinforcement mesh 43B Reinforcement mesh 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 Bracket Main Body 72A Split Bracket 72B Split Bracket 73 Connecting Bolt 74 Fixing Bolt 75 Connecting Piece 76 Mounting Hole 77 Mounting 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 reinforcing structure of an existing rockfall protection net having a main mesh body laid on the slope and having an opening for rockfall 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, the reinforcement net or the main rope that is stretched between the upper ends of the struts is connected to and supported by the upper end. set hanging,
A connecting bracket is detachably fixed to the upper ends of the plurality of columns, an auxiliary rope is stretched on the connecting bracket, and the upper end of the reinforcing mesh is connected to and supported by the auxiliary rope, thereby closing the opening. So that the reinforcing mesh body is hung toward the slope side,
A brake bracket is slidably attached along the column in the middle of the column, and one end is fixed to the slope on the mountain side of the column as an auxiliary suspension rope to reinforce 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,
Reinforced structure of the existing rockfall protection net characterized by that.   2. The reinforcing structure for an existing 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 reinforcing net.

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