JP2019060104A - Buffer - Google Patents

Abstract

To provide a buffer that makes constant a reduction in the tension applied to a rope material supporting a falling rock capture part.SOLUTION: A buffer 100 is a buffer that grips overlapping parts of two rope members that are tensioned in the opposite direction when capturing falling rocks, in which: one of the two rope members is disposed between a first swollen part 12 and an intermediate plate 30; and the other of the two rope members is disposed between a second swollen part 22 and the intermediate plate. Thus, at the time of falling rock capture, the two rope members make surface contact with a first constraint plate 10, a second constraint plate 20, and the intermediate plate, and slide against the sliding frictional resistance. At this time, the buffer makes constant the reduction in the tension applied to the two rope members by bringing the two rope members into surface contact with the first constraint plate, the second constraint plate, and the intermediate plate.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a shock absorber attached to a rockfall protection device for catching rockfall.

  In order to prevent rocks, earth and sand, fallen trees, etc. from falling to the streets or houses, a rock fall protection device is installed on roadsides or hillsides, etc. and captures rocks etc. (hereinafter referred to as falling rocks) during falling. It is done. In addition, a shock absorber is used as a rockfall protection device that captures rockfall and absorbs the energy of the rockfall.

  For example, when the overlapping portion formed by polymerizing the rope material supporting the falling rock prevention net which captures the falling rock is held by the holding tool with a constant force, and the tension above the set tension acts on the rope material, the rope material is constant A shock absorbing device has been proposed in which the rope material at the polymerization site is stretched to absorb tension while holding the frictional force (see, for example, Patent Document 1).

JP-A-6-173221

  The shock absorber attached to the conventional rock fall protection device utilizes friction by polymerizing a wire rope and contact between rope materials. However, the wire rope is made by twisting the strands, and the circumferential surface of the wire rope is formed to be uneven. Therefore, in the friction caused by the sliding of the wire ropes, the frictional force is not constant, and it is difficult to make the reduction of the tension of the rope material constant. In the fall protection system, if the reduction in tension of the rope material indicating the fall prevention net is not constant, the tension of the rope material is rapidly applied to the support or anchor supporting the rope material, for example, in the direction in which the support is not intended. There is a risk of collapse.

  The present invention has been made to solve the problems as described above, and it is an object of the present invention to provide a shock absorber that makes constant a reduction in tension applied to a rope material.

  The shock absorber according to the present invention is attached to a rock fall protection device having a rope-like support member supporting a rock fall catcher for catching a rock fall, which constitutes a support member, and two tensions act in the opposite direction at the time of rock fall catch. A shock-absorbing device for holding the overlapping portion of the rope member, the first flat plate portion formed in a flat plate shape, and a first bulging bulging along a longitudinal direction at a central portion in a short direction of the first flat plate portion. A first restraint plate having a projecting portion, a second flat plate portion formed in a flat plate shape, and a second bulging portion bulging along a longitudinal direction at a central portion in the width direction of the second flat plate portion; And the intermediate plate disposed between the first restraint plate and the second restraint plate, and the first flat plate portion of the first restraint plate and the second flat plate portion of the second restraint plate. A member, and one of the two rope members between the first bulging portion and the middle plate Wood is arranged, in which the other rope member of the two ropes member between the second bulging portion and the intermediate plate is arranged.

  The shock absorbing device according to the present invention is a shock absorbing device for holding a superposed portion of two rope members acting in tension in the opposite direction at the time of falling rockfall, comprising two between the first bulging portion and the middle plate. One of the rope members is disposed, and the other of the two rope members is disposed between the second bulging portion and the intermediate plate. Therefore, at the time of rockfall capture, the two rope members make surface contact with the first restraint plate and the second restraint plate and the intermediate plate, and slide against the sliding frictional resistance. At this time, the shock absorber makes the reduction in tension applied to the two rope members constant by bringing the two rope members into surface contact with the first restraint plate and the second restraint plate and the intermediate plate. be able to.

BRIEF DESCRIPTION OF THE DRAWINGS It is the schematic of the falling stone protection apparatus with which the shock absorber which concerns on Embodiment 1 of this invention was attached. It is the schematic of the supporting member of FIG. It is a front view of the shock absorber which concerns on Embodiment 1 of this invention. It is the sectional view on the AA line of the shock absorber which concerns on Embodiment 1 of this invention. 1 is a side view of a shock absorber according to Embodiment 1 of the present invention.

Embodiment 1
FIG. 1 is a schematic view of a rockfall protection device 200 to which a shock absorber 100 according to a first embodiment of the present invention is attached. In the following drawings including FIG. 1, the relative dimensional relationships, shapes, and the like of the respective constituent members may differ from the actual ones. Moreover, in the following drawings, what attached | subjected the same code | symbol is the same or it corresponds to this, and this shall be common in the whole text of a specification. In addition, terms that indicate direction (for example, "upper", "lower", "right", "left", "front", "rear", etc.) are appropriately used to facilitate understanding, but their notation For the convenience of the description, it is only described as such, and does not limit the arrangement and orientation of the device or parts.

[Fall stone protection device 200]
First, a rockfall protection device 200 to which the shock absorber 100 according to the first embodiment of the present invention is attached will be described. The rock fall protection apparatus 200 is installed on the side of a road or a slope of a mountain slope to prevent rocks, earth and sand, fallen trees and the like from falling to roads or houses, and captures rocks and the like during falling. The rock fall protection apparatus 200 has a plurality of columns 220 fixed to the supported portion 210 and a horizontal column 230 installed between the plurality of columns 220. In addition, the rockfall protection device 200 has a rockfall catching portion 240 that covers the space between the plurality of pillars 220 between the horizontal column 230 and the supported portion 210 and catches the rockfall. The rockfall protection device 200 also has a rope-like support member 250 that supports the rockfall catcher 240. Furthermore, the rockfall protection device 200 has the shock absorber 100 in the support member 250. The rock fall protection apparatus 200 captures rock fall and absorbs kinetic energy of the rock fall using the support 220, the horizontal column 230, the rock fall capture portion 240, the support member 250, and the shock absorber 100.

[Supported portion 210]
The supported portion 210 is a ground such as a roadside or a mountain slope, or a base portion such as a retaining wall. The supported portion 210 may be a portion constituting a slope or a portion constituting a flat surface.

[Support 220]
The plurality of columns 220 are cylindrical columns erected on the supported portion 210, and one end thereof is embedded and fixed in the supported portion 210. The columns 220 are not limited to cylindrical columns, but may be columns of other shapes such as polygonal columns. In addition, when the rock fall trapping portion 240 absorbs kinetic energy of rock fall above a certain level, the support 220 bends in a predetermined direction and releases kinetic energy of the rock fall in a predetermined direction.

[Horizontal pole 230]
The horizontal column 230 is a cylindrical column installed on the other end side of the column 220, and is fixed directly or indirectly to the top of the column 220. The horizontal column 230 is not limited to a cylindrical column, and may be a column having another shape such as a polygonal column. The lateral column 230 determines the direction of deformation of the column 220 by the cross-sectional rigidity.

[Falling rock catcher 240]
The rockfall trapping portion 240 is for trapping the rockfall when a rockfall occurs. The fallen rock catching portion 240 is formed, for example, by knitting a steel wire rope in a grid shape. The fallen rock catching portion 240 is formed in a substantially rectangular shape, and a plurality of first support members 251 and second supporting members 255 are stretched around the fallen rock catching portion 240. The fallen rock catching portion 240 is disposed so as to cover the plurality of columns 220 between the horizontal column 230 and the supported portion 210.

[Supporting member 250]
FIG. 2 is a schematic view of the support member of FIG. The support member 250 will be described using FIGS. 1 and 2. The support member 250 is, as shown in FIG. 1, disposed between the horizontal pillar 230 and the supported portion 210 and supporting the falling rock catching portion 240 between the rope-like first support member 251 and the plurality of pillars 220. And a rope-like second support member 255 arranged to support the falling rock catching portion 240.

(First support member 251)
The first support member 251 is formed in a rope shape, is disposed between the horizontal column 230 and the supported portion 210, and supports the fallen rock catching portion 240. The first support member 251 is formed of, for example, a steel wire rope. One end of the first support member 251 is directly or indirectly fixed to the supported portion 210, and the other end is directly or indirectly fixed to the cross column 230. The shock absorber 100 can be installed on the first support member 251 between the horizontal column 230 and the supported portion 210 as shown in FIG. As shown in FIG. 2, the first support member 251 has one end fixed to the supported portion 210 and the other end fixed to the rope member 253 engaged with the shock absorber 100, and one end fixed to the horizontal post 230, The other end has a rope member 252 engaged with the shock absorber 100. The first support member 251 may be provided with another shock absorber not shown between the cross column 230 and the shock absorber 100. When the shock absorbing device 100 is installed on the first support member 251, the rope member 252 and the rope member 253 correspond to "two rope members" in the present invention.

(Second support member 255)
The second support member 255 is formed in a rope shape, is disposed between the plurality of columns 220, and supports the rockfall catching portion 240. The second support member 255 is formed of, for example, a steel wire rope. The second support member 255 may be fixed to the support 220 directly or indirectly. The shock absorber 100 can be installed on the second support member 255 between the columns 220 as shown in FIG. The second support member 255 is fixed to the rope member 256, one end of which is fixed to the support 220 and the other end engages with the shock absorber 100, and the other end fixed to the other support 220 adjacent to the other end. It consists of a pair of rope members 257, and corresponds to "two rope members" of the present invention.

[Shock absorber 100]
FIG. 3 is a front view of the shock absorber 100 according to the first embodiment of the present invention. FIG. 4: is the sectional view on the AA line of the shock absorber 100 based on Embodiment 1 of this invention. FIG. 5 is a side view of the shock absorber 100 according to the first embodiment of the present invention. The shock absorber 100 will be described using FIGS. 1 to 5. The arrows in FIG. 5 indicate the direction of the tension acting on the rope member 252 and the rope member 253 when the rockfall catcher 240 is catching a rockfall. In the following description, it is assumed that the shock absorber 100 is disposed in the first support member 251. And "two rope members" as described in the present invention are explained as rope member 252 and rope member 253 which constitute the first support member 251. When the shock absorber 100 is disposed in the second support member 255, the portions described as the rope member 252 and the rope member 253 correspond to the rope member 256 and the rope member 257.

  The shock absorber 100 is one of the devices that absorb kinetic energy of falling rocks. The shock absorber 100 is attached to a rockfall protection device 200 having a rope-like support member 250 supporting a rockfall catcher 240 for catching rockfall. The shock absorber 100 constitutes a support member 250, and grips overlapping portions of two rope members, a rope member 252 and a rope member 253, which are tensioned in the opposite direction at the time of rockfall capture. The shock absorber 100 includes a first restraint plate 10, a second restraint plate 20, an intermediate plate 30, and a fastening member 40.

  The first constraining plate 10 is formed by bending a rectangular plate, and the first flat plate portion 11 formed in a flat plate shape and the longitudinal direction at the central portion in the width direction of the first flat plate portion 11 And a first bulging portion 12 bulging in an arc shape in cross section. The second restraint plate 20 is formed by bending a rectangular plate, and the second restraint plate 20 has a longitudinal direction in a central portion of the second flat plate portion 21 formed in a flat plate shape and the second flat plate portion 21 in the lateral direction. And a second bulging portion 22 bulging in an arc shape in cross section. The length in the longitudinal direction of the first restraint plate 10 and the second restraint plate 20 is appropriately determined in accordance with the tension acting on the rope member 252 and the rope member 253. As the first restraint plate 10 and the second restraint plate 20, it is desirable to use various metal plates having high tensile strength, such as spring steel. In addition, the cross-sectional shape of the 1st bulging part 12 and the 2nd bulging part 22 is not limited to circular arc shape, For example, even if it is other cross-sectional shapes, such as reverse V shape and reverse U shape Good.

  In the first flat plate portion 11 and the second flat plate portion 21 on both sides of the first bulging portion 12 and the second bulging portion 22, bolt holes (not shown) are formed in one row along the longitudinal direction. It is done. In consideration of the restraint effect of the rope members 252 and 253 by the first flat plate portion 11 and the second flat plate portion 21, the forming position of the bolt hole, that is, the fastening position of the fastening member 40 is the first bulging portion 12 and the second bulging portion. A position closer to the bulging portion 22 is desirable.

  When the first restraint plate 10 and the second restraint plate 20 overlap each other, the first bulging portion 12 and the second bulging portion 22 are formed so as to bulge in opposite directions. The rope member 252 and the rope member 253 are respectively inserted into the first bulging portion 12 and the second bulging portion 22. Inner circumferential surfaces of the first bulging portion 12 and the second bulging portion 22 have a shape that allows surface contact with the circumferential surfaces of the rope member 252 and the rope member 253.

  The middle plate 30 is disposed between the opposing first restraint plate 10 and the second restraint plate 20. The intermediate plate 30 is a rigid body formed in a rectangular shape, and is a plate in which holes are bored in the bolt holes of the first flat plate portion 11 and the second flat plate portion 21. The intermediate plate 30 is formed with smooth surfaces that come in contact with the rope members 252 and the two rope members of the rope members 253.

  The fastening member 40 clamps the first flat plate portion 11 located on both sides via the first bulging portion 12 and the second flat plate portion 21 located on both sides via the second bulging portion 22. The fastening member 40 is provided on both sides of the first bulging portion 12 and the second bulging portion 22 along the first bulging portion 12 and the second bulging portion 22. The fastening member 40 has a bolt 41 and a nut 42. In addition, the fastening member 40 can be softly coupled (coupled to slide by a predetermined tensile force) with the first restraint plate 10, the second restraint plate 20, the intermediate plate 30, and the rope member 252 and the rope member 253. It is not limited to the bolt 41 and the nut 42. The installation number of the fastening member 40 is a total of eight places of four places on one side in the both sides of the 1st bulging part 12 and the 2nd bulging part 22, as shown in FIGS. 3-5. However, the installation number of the fastening members 40 is not limited to eight in total, and is appropriately determined in accordance with the tension acting on the rope member 252 and the rope member 253.

  One rope member 252 of the two rope members is disposed between the first bulging portion 12 and the middle plate 30, and the two rope members are disposed between the second bulging portion 22 and the middle plate 30. The other rope member 253 is disposed. The first bulging portion 12 and the second bulging portion 22 by the fastening force by the fastening member 40 acting on the first restraint plate 10 and the second restraint plate 20, and the intermediate plate 30, the rope member 252 and the rope member Hold the two 253 rope members. The shock absorbing device 100 sandwiches the rope member 252 and the rope member 253 with a frictional force that slides against the shock absorbing device 100 when a tension greater than a predetermined tension is loaded on the rope member 252 and the rope member 253.

  The two rope members of the rope member 252 and the rope member 253 each hold a midway portion of the rope. Therefore, the two rope members of the rope member 252 and the rope member 253 have an extra length portion 252a and an extra length portion 253a which extend from the first restraint plate and the second restraint plate by a predetermined length, respectively. , Its end is a free end. The extra length portion 252a and the extra length portion 253a extend in opposite directions from the first restraint plate and the second restraint plate, respectively. In the case where the support members 250 constituting the two rope members are the first support members 251 disposed between the horizontal column 230 and the supported portion 210 and supporting the falling rock catching portion 240, two of them. The rope member is composed of a rope member 252 and a rope member 253. One rope member 252 of the two rope members is fixed directly or indirectly to the cross column 230, and the other rope member 253 of the two rope members is directly fixed to the supported portion 210. Fixedly or indirectly. Moreover, when the support member 250 which comprises two rope members is the 2nd support member 255 which is arrange | positioned between the horizontal several columns 220 and supports the falling stone capture part 240, two rope members are ropes It comprises a member 256 and a rope member 257. One rope member 256 of the two rope members is directly or indirectly fixed to the support 220, and the other rope member 257 of the two rope members is the other support adjacent to the support 220. 220 is fixed directly or indirectly.

  In order to prevent the rope member 252 and the rope member 253 from falling out between the first restraint plate 10 and the second restraint plate 20 and the intermediate plate 30, the rope member 252 and the end of the rope member 253 have a locking portion 270 and A locking portion 271 is provided. The locking portion 270 and the locking portion 271 are provided at the tip end portions of the extra length portion 252a and the extra length portion 253a. The locking portion 270 and the locking portion 271 have an end edge portion 270 a protruding outward beyond the diameter of the opening 35 formed between the first restraint plate 10 and the second restraint plate 20 and the intermediate plate 30. It has an edge 271a. Even when the rope member 252 and the rope member 253 slide, the end edge portion 270a and the end edge portion 271a abut on the first restraint plate 10, the second restraint plate 20, and the intermediate plate 30. Therefore, the locking portion 270 and the locking portion 271 prevent the rope member 252 and the rope member 253 from falling off the opening 35.

[Operation of shock absorber 100]
The rope member 252 and the rope member 253 are in a state of being firmly fixed in surface contact with the first restraint plate 10 and the second restraint plate 20 and the intermediate plate 30 in a normal state in which no falling rock is captured. . When the falling rock is captured by the falling rock capture portion 240, the rope member 252 and the rope member 253 supporting the falling rock capture portion 240 are loaded by the falling rock and tension is applied. When a predetermined tension or more acts on the rope member 252 and the rope member 253, the rope member 252 and the rope member 253 resist sliding friction resistance between the first restraint plate 10 and the second restraint plate 20 and the intermediate plate 30. However, it slides in the direction of coming out of the first restraint plate 10 and the second restraint plate 20 and the intermediate plate 30. The rope member 252 and the rope member 253 slide against the sliding frictional resistance to buffer the impact force of the fallen rock and reduce the tension acting on the rope member 252 and the rope member 253.

  As described above, the shock absorber 100 grips the overlapping portions of the two rope members of the rope member 252 and the rope member 253, which are tensioned in the opposite direction when catching a falling rock. In the shock absorbing device 100, one rope member 252 of the two rope members is disposed between the first bulging portion 12 and the middle plate 30, and the second bulging portion 22 and the middle plate 30 are provided. The other rope member 253 of the two rope members is disposed between them. Therefore, in the shock absorber 100, the rope member 252 and the rope member 253 make surface contact with the first restraint plate 10 and the second restraint plate 20 and the intermediate plate 30, and slide against the sliding frictional resistance. At this time, in the shock absorber 100, the two rope members make surface contact with the first restraint plate 10 and the second restraint plate 20 and the intermediate plate 30, thereby reducing the tension applied to the two rope members. Can be fixed. Moreover, the shock absorbing device 100 can slide the rope member 252 and the rope member 253 with an intended load by being able to make constant the reduction of the tension applied to the rope member 252 and the rope member 253.

  Further, the surface of the intermediate plate 30 in contact with the two rope members of the rope member 252 and the rope member 253 is formed as a smooth surface. Therefore, shock absorbing device 100 can make initial movement load at the time of sliding of rope member 252 and rope member 253 constant.

  In addition, the fastening member 40 is provided on both sides of the first bulging portion 12 and the second bulging portion 22 along the first bulging portion 12 and the second bulging portion 22, and the first bulging portion 12 is The first flat plate portion 11 located on both sides and the second flat plate portion 21 located on both sides via the second bulging portion 22 are fastened. Therefore, the shock absorber 100 has no eccentricity in fastening the first restraint plate 10 and the second restraint plate 20, and the rope member 252 and the rope member 253 exert tension on the same line. The reduction of applied tension can be made constant.

  Further, the two rope members of the rope member 252 and the rope member 253 have a surplus length portion 252 a and a surplus length portion 253 a extended from the first restraint plate 10 and the second restraint plate 20. Therefore, the shock absorbing device 100 adjusts the lengths of the extra length portion 252a and the extra length portion 253a to make the rope member 252 and the rope member until the load applied to the falling rock capturing portion 240 becomes the intended absorbed energy (work amount) 253 can slide.

  Further, the two rope members of the rope member 252 and the rope member 253 are disposed between the first restraint plate 10 and the second restraint plate 20 and the middle plate 30 at the tip end portions of the extra length portion 252a and the extra length portion 253a. A locking portion 270 and a locking portion 271 having an end edge portion 270a and an end edge portion 271a protruding outward beyond the diameter of the opening 35 formed in the. Therefore, the shock absorbing device 100 adjusts the sliding length of the rope member 252 and the rope member 253 to adjust the load applied to the falling rock catching portion 240 to the intended absorbed energy (work amount). The member 253 can slide.

  Further, one rope member 252 of the two rope members is directly or indirectly fixed to the horizontal post 230, and the other rope member 253 of the two rope members is fixed to the supported portion 210. It is fixed directly or indirectly. Therefore, the shock absorber 100 can reduce the tension of the first support member 251 between the horizontal column 230 and the supported portion 210.

  One rope member 256 of the two rope members is directly or indirectly fixed to the support 220, and the other rope member 257 of the two rope members is adjacent to the support 220. It is fixed to the support 220 directly or indirectly. Therefore, the shock absorber 100 can reduce the tension of the second support member 255 between the columns 220.

  The embodiment of the present invention is not limited to the above-described Embodiment 1, and various modifications can be made. For example, the supported portion 210 is not limited to the ground or a base portion such as a retaining wall, and may be steel (for example, H-shaped steel, square steel pipe, round steel pipe). Further, the shock absorber 100 does not have to be provided for all the first support members 251 and the second support members 255, and may be provided only at the places where a large tension acts on the first support members 251 and the second support members 255. .

  10 first restraint plate, 11 first flat plate portion, 12 first bulged portion, 20 second restraint plate, 21 second flat plate portion, 22 second bulged portion, 30 intermediate plate, 35 opening portion, 40 fastening member, 41 bolt, 42 nut, 100 shock absorber, 200 rock fall protection device, 210 supported portion, 220 post, 230 horizontal post, 240 rock falling catch portion, 250 support member, 251 first support member, 252 rope member, 252a excess length portion , 253 rope member, 253a extra length portion, 255 second support member, 256 rope member, 257 rope member, 270 locking portion, 270a end edge portion, 271 locking portion, 271a end edge portion.

Claims (7)

Attached to a rockfall protection device having a rope-like support member supporting a rockfall catcher for catching a rockfall, which constitutes the support member, and which includes tensioned portions of two rope members acting in tension in the opposite direction at the time of rockfall catchment A shock absorber that holds
A first restraint plate having a first flat plate portion formed in a flat plate shape, and a first bulging portion bulging along a longitudinal direction at a central portion in a short side direction of the first flat plate portion;
A second restraint plate having a second flat plate portion formed in a flat plate shape, and a second bulging portion bulging along a longitudinal direction at a central portion in the short side direction of the second flat plate portion;
An intermediate plate disposed between the first restraint plate and the second restraint plate;
A fastening member for fastening the first flat plate portion of the first restraint plate and the second flat plate portion of the second restraint plate;
Have
One rope member of the two rope members is disposed between the first bulging portion and the intermediate plate,
The buffer device wherein the other rope member of the two rope members is disposed between the second bulging portion and the intermediate plate.   The shock absorber according to claim 1, wherein the middle plate has a smooth surface in contact with the two rope members.   The fastening member is provided on both sides of the first bulging portion and the second bulging portion along the first bulging portion and the second bulging portion, and the fastening member is provided via the first bulging portion. The shock absorber according to claim 1 or 2 which fastens said 1st flat part located on both sides, and said 2nd flat part located on both sides via said 2nd bulging part.   The shock absorber according to any one of claims 1 to 3, wherein the two rope members have extra length portions extending from the first restraint plate and the second restraint plate.   The two rope members protrude outward beyond the diameter of the opening formed between the first restraint plate, the second restraint plate, and the middle plate at the tip end portion of the extra length portion. The shock absorber according to claim 4, further comprising a locking portion having an end edge. The rockfall protection device further includes: a plurality of columns fixed to the supported portion; and a horizontal column installed between the plurality of columns.
One rope member of the two rope members is directly or indirectly fixed to the cross column,
The shock absorber according to any one of claims 1 to 5, wherein the other rope member of the two rope members is fixed directly or indirectly to the supported portion. The rockfall protection device further includes a plurality of columns fixed to the supported portion,
One rope member of the two rope members is directly or indirectly fixed to the support post,
The shock absorber according to any one of claims 1 to 5, wherein the other rope member of the two rope members is fixed directly or indirectly to the other pillar adjacent to the pillar.

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