JP5851909B2 - Shock-absorbing structure of cable-shaped body and protective fence - Google Patents

Description

  The present invention relates to a shock absorbing structure for a cable-shaped body for absorbing the impact force when the impact force is applied to a cable-like body constructed between supports such as columns and embankments, and a protective fence using the same. It is.

  Conventionally, various structures have been proposed as an impact absorbing structure that absorbs an impact force when the impact force is applied to a cord-like body installed between support bodies such as support columns.

  In Patent Document 1 and Patent Document 2, a shock absorbing structure having a sandwiching structure is proposed. This is because when a plurality of plate members are sandwiched between a plurality of plate members, a plurality of plate members are tightened with bolts, caulking, etc., and when an impact force is applied to the cable members, It is structured to absorb shocks by friction between the two.

  Moreover, in patent document 3, the shock absorption structure used for the connection part of the cord-shaped body arrange | positioned in series is proposed. This includes an outer cylinder attached to the end of one cable-shaped body, a resistor housed in the outer cylinder, connected to the end of the other cable-shaped body, and a resistor and an outer cylinder. And an elastic body that compresses and absorbs an impact force according to the movement of the other cord-like body. Thereby, when an impact force is applied, the elastic body is compressed in accordance with the movement of the cord-like body, and the resistor is forced to pass through the elastic body to absorb the shock.

JP 2003-301418 A JP 2010-144433 A JP 2009-150097 A

  However, in the impact absorbing structure having a sandwiching structure as in Patent Document 1 or the like, a structure other than the pressing surface of the plate member pressing the cord-like body has a structure that hardly causes friction. For this reason, in this structure, the pressing surface of the plate material is worn due to friction, so that the frictional force gradually decreases, and there is a problem that a stable shock absorbing performance cannot be obtained continuously. In addition, this structure is a structure that adjusts the shock absorbing performance by adjusting the tightening force with bolts or caulking. For this reason, in this structure, it is necessary to finely adjust the tightening force with bolts etc. to obtain the desired shock absorption performance, and the tightening force with bolts etc. will be adjusted by field workers, so the tightening force Variations are likely to occur. As a result, this structure has a problem that it is difficult to easily obtain a desired shock absorbing performance.

  In addition, since the shock absorbing structure as in Patent Document 3 can be attached only to the end of the cord-like body, the number of attachments is increased even when the length of the cord-like body between the supports is long. There is a problem that can not be. In addition, when the interval between the shock absorbing structures is shorter than the entire length of the cord-like body, it is necessary to cut so that the cord-like body is shortened. is there.

  Therefore, the present invention has been devised in view of the above-mentioned problems, and the object of the present invention is to obtain a stable shock absorbing performance continuously with respect to the impact force, and to obtain a desired shock absorbing performance. It is another object of the present invention to provide a shock-absorbing structure for a cord-like body that can easily obtain the above-described problem and that can advantageously solve the above-described problems.

  In order to solve the above-mentioned problems, the present inventor has invented the following shock-absorbing structure of a cord-like body after intensive studies.

The shock absorbing structure of the cord-like body according to the first invention is a shock-absorbing structure of the cord-like body for absorbing the impact force when the falling object collides with the cord-like body constructed between the supports, An impact absorbing member provided with a slit, and a slit width holding portion for holding the slit width of the slit, the slit being smaller than the diameter of the inlet portion where the cord-like body is arranged and the cord-like body A narrow portion formed in a slit width and extending in a direction in which the cord-like body can move from the inlet portion when the impact force is applied, and the shock absorbing member includes the slit width holding portion A member widened portion provided apart from the member in the longitudinal direction of the slit, and a member narrower portion provided on the slit width holding portion side in the longitudinal direction of the slit from the member widened portion. The in-plane rigidity of the width portion is the member widened portion. It is characterized by a low Ri.

The shock absorbing structure for a cord-like body according to a second aspect of the present invention is the shock absorber according to the first aspect, wherein the shock absorbing member is a cylindrical body around which a loop portion having a part of the cord-like body is wound. Is provided on the outer peripheral surface of the cylindrical body along the cord-like body constituting the loop portion, the intermediate portion of the loop portion is wound around the narrow portion, and the inlet portion is Both ends of the loop portion are inserted .

  According to a third aspect of the present invention, there is provided the shock absorbing structure for a cord-like body according to the first or second aspect, wherein the member narrow portion is in a direction orthogonal to the longitudinal direction of the slit of the shock absorbing member from the member widened portion. By reducing the width, it is provided with lower rigidity in the in-plane direction than the member widened portion.

  The shock absorbing structure for a cord-like body according to a fourth aspect of the present invention is the first aspect or the second aspect of the present invention, wherein the member narrow width portion is made smaller in width in the thickness direction of the shock absorbing member than the member widened portion, It is characterized by being provided with lower rigidity in the in-plane direction than the member widened portion.

  In the shock absorbing structure for a cord-like body according to a fifth aspect of the present invention, in any one of the first to fourth aspects, the slit width holding portion is provided at an interval in the longitudinal direction of the slit with respect to the slit. The member widened portion is provided at a substantially central position of the slit width holding portion adjacent in the longitudinal direction of the slit.

  According to a sixth aspect of the present invention, a protective fence includes a plurality of support members erected at intervals in the lateral direction, and a cord-like member erected between the plurality of support members. The shock absorbing structure for a cord-like body according to any one of the first to fifth inventions is used.

  According to the 1st invention-the 5th invention, even if the slit side surface of a slit wears, it becomes possible to exhibit the stable shock absorption performance to the impact force continuously. Further, in order to obtain the desired shock absorption performance, it is not necessary to finely adjust the tightening force with bolts or caulking, and the desired shock absorption performance can be easily obtained.

  According to 1st invention-5th invention, it is provided in the slit width holding | maintenance part side from the member widening part from the member widening part provided apart from the slit width holding part in the slit longitudinal direction, and it is in-plane direction from the member widening part. Since the impact absorbing member has the narrow part of the member provided with low rigidity, it is possible to exhibit the impact absorbing performance over the entire length in the slit longitudinal direction of the narrow part, and the maximum load and minimum load It is possible to exhibit high shock absorption performance because of the small difference.

  According to 1st invention-5th invention, it becomes possible to lengthen the construction length of the cord-like body between support bodies, it is possible to exhibit the impact absorption performance by a support body effectively, It is possible to sufficiently exhibit the impact absorbing performance of both the cylindrical body and the net body. According to 1st invention-5th invention, it becomes possible to attach an impact-absorbing member in any site | part of a cord-like body, and it can be used without being restrict | limited by the length of a cord-like body.

  According to the sixth aspect of the present invention, it is possible to provide a protective fence that can obtain the effect of the shock absorbing structure for a cord-like body according to the first to fifth aspects of the present invention.

(A) is a top view which shows the structure of the guard fence in which the impact-absorbing structure which concerns on 1st Embodiment is used, (b) is the rear view. (A) is a side sectional view showing the configuration of the shock absorbing structure according to the first embodiment, and (b) is a rear view thereof. It is an expansion side sectional view showing what expanded the composition of the shock absorption structure concerning a 1st embodiment. (A) is a top view for demonstrating the effect of the shock absorption structure which concerns on 1st Embodiment, (b) is the expanded sectional side view. (A) is a figure for showing the relation between the load and the displacement in the shock absorbing structure of the comparative example, (b) is the relation between the load and the displacement in the shock absorbing structure of the cord-like body to which the present invention is applied. It is a figure for showing. (A) is a side view of the impact-absorbing member used for the impact-absorbing structure of the cord-like body to which this invention is applied, (b) is a side view of the impact-absorbing member of a comparative example. (A) is a graph which shows the relationship between the displacement of the cord-like body in the impact-absorbing structure of the cord-like body to which the present invention is applied and the load applied to the cord-like body, and (b) It is a graph for demonstrating the effect of the shock absorption structure of the cord-like body to which invention is applied. (A) is an enlarged plan view which shows the structure of the impact-absorbing structure which concerns on 2nd Embodiment, (b) is AA sectional view taken on the line of (a), (c) is 2nd Embodiment. It is an expanded side sectional view which shows what expanded the structure of the shock absorption structure which concerns. (A) is an enlarged plan view for demonstrating the effect of the impact-absorbing structure which concerns on 2nd Embodiment, (b) is the top view. (A) is an enlarged plan view which shows the structure of the impact-absorbing structure which concerns on 3rd Embodiment, (b) is an enlarged plan view for demonstrating the effect, (c) is 3rd. It is an expansion side sectional view showing what expanded the composition of the shock absorption structure concerning an embodiment. (A) is an enlarged plan view which shows the structure before the movement of the cord-shaped body of the impact-absorbing structure which concerns on 4th Embodiment, (b) is an enlarged plan view which shows the structure after the movement, c) is an enlarged rear cross-sectional view for explaining the function and effect. (A) is a top view which shows the structure of the guard fence in which the impact-absorbing structure which concerns on 5th Embodiment is used, (b) is the back view. (A) is a side view of the impact-absorbing member used for the impact-absorbing structure which concerns on 5th Embodiment, (b) is the front view. (A) is an expanded view which shows typically what developed the shock absorption member used for the shock absorption structure concerning a 5th embodiment along the peripheral direction, and (b) is the plane of the shock absorption member. It is sectional drawing. It is a front view which shows the structure of the shock absorption structure which concerns on 5th Embodiment. (A) is a front view which shows the structure of the other form of a guard fence, (b) is the top view.

  Hereinafter, embodiments for carrying out a shock absorbing structure for a cord-like body to which the present invention is applied will be described in detail with reference to the drawings.

  The shock absorbing structure 3 according to the present invention is used in a protective fence 1 for preventing a fall by colliding with a fallen object A such as a falling rock or an avalanche as shown in FIG. The shock absorbing structure 3 according to the present invention is not limited to this, and can also be used for a master rope, a master rope support or the like for preventing a worker working at a high place from falling during temporary construction or the like.

  As shown in FIGS. 1 and 4, the protective fence 1 includes a plurality of supports 31 and cords 13, and also includes a net 15 as necessary. For the support 31, for example, a support 11 such as an H-shaped steel or a steel pipe is used, and a plurality of the supports 31 are erected at intervals in the lateral direction. The support 31 is not limited to this, and a master rope support, embankment, ground, or the like can also be used. For example, a cable-shaped body such as a wire rope is used as the cable-shaped body 13 and is laid between the support bodies 31 such as the plurality of support columns 11. As for the net 15, for example, a wire net is attached to the cord 13.

  The protective fence 1 is formed by the cord-like body 13 and the net body 15 to form a protective surface for capturing the fallen object A such as falling rocks. Thus, the impact force acts in the action direction P3 parallel to the front-rear direction P2 of the support 31.

  As shown in FIGS. 2 to 4, the shock absorbing structure 3 according to the present invention includes a shock absorbing member 33 provided with a slit 35 and a slit width holding portion that holds the slit width of the slit 35 in the first embodiment. 41.

  The impact absorbing member 33 is provided to absorb the impact force when the impact force is applied to the cord-like body 13. In the first embodiment, the impact absorbing member 33 is attached to the back side of the support column 11 as the support body 31. It is done. The shock absorbing member 33 is not limited to this, and may be attached to the front side of the column 11 as the support 31. In the first embodiment, the shock absorbing member 33 is attached by joining means such as welding or a bolt after the end 33e of the shock absorbing member 33 is abutted against the support column 11 as the support 31.

  In the first embodiment, the shock absorbing member 33 is constituted by a single flat plate material, and a metal member such as a steel material is used. The shock absorbing member 33 is not limited to this, and may be composed of a single plate material such as a curved plate shape, a plurality of plate materials, members of various shapes, or a synthetic resin or the like. May be.

  The shock absorbing member 33 is a member provided at a position away from the slit width holding portion 41 in the slit longitudinal direction P1 and having a larger vertical width than the member narrow width portion 3b, which is a direction perpendicular to the slit longitudinal direction P1. It has a widened portion 3a. The impact absorbing member 33 is formed by reducing the width in the vertical direction, which is a direction perpendicular to the slit longitudinal direction P1, from the member widened portion 3a at a position closer to the slit width holding portion 41 in the slit longitudinal direction P1 than the member widened portion 3a. The member narrow portion 3b is provided with lower rigidity in the in-plane direction than the member wide portion 3a. The impact absorbing member 33 is formed with a curved taper at the upper and lower ends, and is provided with a member widened portion 3a and a member narrowed portion 3b. The impact absorbing member 33 is not limited to this, and the upper end and the lower end may be formed in a linear taper shape.

  The shock absorbing member 33 is not limited to this, and the member widened portion 3a in which the plate thickness of the flat plate material is increased, and the plate thickness of the flat plate material is made thinner than the member widened portion 3a to reduce the width in the thickness direction. The member narrow width portion 3b may be provided. Further, the shock absorbing member 33 is not limited to this, and is hardened only to a part of the shock absorbing member 33 while making the width in the vertical direction and the width in the thickness direction which are orthogonal to the slit longitudinal direction P1 uniform. The member widened portion 3a is formed using tempered steel or the like, the remaining portion of the shock absorbing member 33 is defined as the member narrowed portion 3b, and the member narrower provided with lower in-plane rigidity than the member widened portion 3a. It is good also as what has the width | variety part 3b.

  The slit width holding unit 41 exhibits a function of holding the slit width of the slit 35. In the first embodiment, the slit width holding portion 41 is composed of a connection portion 42 that connects the upper portion 33a and the lower portion 33b with the slit 35 of the shock absorbing member 33 interposed therebetween. The slit width holding portion 41 is provided on both sides of the slit 35 in the slit longitudinal direction P <b> 1 with respect to the slit 35.

  The slit 35 is provided in the impact absorbing member 33 by subjecting the plate material to cutting, drilling, or the like. In the first embodiment, the slit 35 has an entrance 36 in which the cord 13 is disposed, and the slit longitudinal direction P1 in which the cord 13 can move from the entrance 36 when an impact force is applied. A narrow portion 37 provided continuously from the portion 36. In the first embodiment, the inlet portion 36 is provided in a hole shape penetrating the impact absorbing member 33, and the cord-like body 13 is arranged in the inlet portion 36 with the cord-like body 13 supported by the impact absorbing member 33. The

  The slit 35 is intended to reduce the entry resistance at the initial stage when the impact force is applied to the cord-like body 13, so that the cord-like body 13 enters the narrow portion 37 from the entrance portion 36 when the impact force is applied. A tapered guide portion (not shown) may be formed so that the slit width becomes narrower toward the front in the approach direction of the cord-like body 13 at the site where the approach starts.

  The slit 35 has a slit bottom surface 35b provided on the front side in the direction in which the cord 13 can move. Thereby, in the shock absorbing structure 3 according to the present invention, when the cord-like body 13 moves in the slit longitudinal direction P1, the cord-like body 13 is locked by the slit bottom surface 35b, and the cord-like body 13 comes out of the slit 35. It is possible to transmit an impact force from the cord-like body 13 to the support body 31 while preventing the above.

  The narrow portion 37 is provided so as to extend in a direction in which the cord 13 can move from the inlet portion 36 when an impact force acts on the cord 13, and in the front-rear direction P <b> 2 of the support 31, in other words, Then, it is provided so as to extend in the acting direction P3 of the impact force on the cord-like body 13. The narrow portion 37 is provided so as to have a slit width smaller than the diameter r of the cord-like body 13 and a constant slit width in the direction P3 of impact force. As a result, the narrow portion 37 can surely slide the cord 13 on the pair of opposed slit side surfaces 35a when the cord 13 is moved from the inlet portion 36 by an impact force. Become.

  As shown in FIG. 4A, the shock absorbing structure 3 according to the present invention has an impact force in the longitudinal direction P2 of the support 31 with respect to the cord 13 when the fallen object A is captured by the protective surface. Works. At this time, the cord-like body 13 moves in the slit longitudinal direction P1 from the entrance portion 36 to the narrow portion 37 of the slit 35 as shown in FIG. In the shock absorbing structure 3 according to the present invention, the cord-like body 13 slides on a pair of opposing slit side surfaces 35 a of the narrow portion 37, and friction between the pair of slit side surfaces 35 a and the cord-like body 13 is caused. The impact force of the falling object A can be absorbed.

  Even if the shock absorbing structure 3 according to the present invention is worn due to friction with the cord-like body 13 in a range where the pair of slit side surfaces 35a of the narrow portion 37 extends over a part of the slit longitudinal direction P1, the remaining portion is not worn. In this range, the cord-like body 13 slides on the pair of slit side surfaces 35a. For this reason, even if a part of slit side surface 35a of the slit 35 is worn, the shock absorbing structure 3 according to the present invention can continuously exhibit a shock absorbing performance that is stable against the impact force.

  Moreover, the impact absorbing structure 3 according to the present invention can exhibit excellent effects in the following points.

  FIG. 5 is a diagram showing the relationship between the displacement of the cord-like body 13 and the load required to move the cord-like body 13 when the cord-like body 13 moves in the narrow portion 37 in the slit longitudinal direction P1. FIG. 5A shows a comparative example, in which the vertical width of the shock absorbing member 33 is constant over the slit longitudinal direction P1. FIG. 5B shows the present invention, a member widened portion 3a having the same vertical width as the impact absorbing member 33 of the comparative example, and the vertical direction of the shock absorbing member 33 rather than the member widened portion 3a. A member narrow portion 3b having a reduced width is provided.

  As shown in FIG. 5 (a), in the comparative example, the movement resistance of the cord-like body 13 increases as it approaches the slit width holding portion 41, and when the movement resistance becomes larger than the impact force, It was found that the movement stopped. At this time, in the comparative example, the cord-like body 13 stops in the middle of the slit longitudinal direction P1, so that the shock absorbing performance cannot be exhibited in the entire length of the slit longitudinal direction P1, and the desired shock absorbing performance is stabilized. Will not be obtained.

  By the way, when the cable-shaped body 13 passes through the narrow portion 37 of the slit 35 formed to have a slit width smaller than the diameter r of the cable-shaped body 13, the shock absorbing member 33 The slits 13 are deformed in the in-plane direction so that the slit width is increased by the reaction force from the cords 13. At this time, the slit 35 has a slit width larger than the initial slit width when the cord-like body 13 passes.

  In the comparative example, the vertical width, which is a direction orthogonal to the slit longitudinal direction P1 of the shock absorbing member 33, is constant over the slit longitudinal direction P1, so that the closer to the slit longitudinal direction P1 from the slit width holding portion 41, the closer to the position. The restraining force by the slit width holding portion 41 is reduced, and the slit 35 is easily deformed in the in-plane direction so that the slit 35 is opened. In the comparative example, since the vertical width of the shock absorbing member 33 that is perpendicular to the slit longitudinal direction P1 is constant in the slit longitudinal direction P1, the slit longitudinal direction P1 position on the slit width holding portion 41 side. Then, the restraining force by the slit width holding part 41 is large, and the slit 35 is difficult to be deformed in the in-plane direction.

  For this reason, in the comparative example, the movement resistance of the cord-like body 13 is small at a position where the slit 35 is easily deformed in the in-plane direction so that the slit 35 is opened, and at the position where the slit 35 is not easily deformed in the in-plane direction. The movement resistance of the body 13 is increased. At this time, in the comparative example, the cord 13 moves to the slit width holding portion 41 side in the slit longitudinal direction P1, and the movement of the cord 13 may stop when the movement resistance becomes larger than the impact force. There is.

  On the other hand, in the present invention, the member widening portion 3a is provided at a position away from the slit width holding portion 41 in the slit longitudinal direction P1, and the slit from the member widening portion 3a is closer to the slit width holding portion 41 in the slit longitudinal direction P1. A member narrow width portion 3b in which the width in the vertical direction, which is a direction orthogonal to the longitudinal direction P1, is reduced is provided. As a result, the present invention deforms the shock absorbing member 33 in the slit longitudinal direction P1 when the cord-like body 13 moves in the in-plane direction in which the slit 35 opens, in a state where the restraining force by the slit width holding portion 41 is applied. Therefore, the movement resistance when the cord-like body 13 moves becomes close to the level in the slit longitudinal direction P1 as compared with FIG.

  For this reason, in the present invention, as shown in FIG. 5B, the slit width when the cord 13 passes is made uniform in the slit longitudinal direction P1, and the slit longitudinal direction P1 of the movement resistance of the cord 13 is obtained. It is possible to suppress fluctuations in. Thus, in the present invention, it is possible to prevent the movement of the cord-like body 13 from stopping when the movement resistance becomes larger than the impact force, and to exhibit the impact absorption performance over the entire length in the slit longitudinal direction P1. .

  In the present invention, as shown in FIG. 5B, when a plurality of slit width holding portions 41 are provided at intervals in the slit longitudinal direction P1 with respect to the slit 35, a plurality of adjacent slit widths are provided. The member widening portion 3 a is provided in the shock absorbing member 33 at a substantially central position of the holding portion 41. This is because, in the range extending in the slit longitudinal direction P1, it is easy to be deformed in the in-plane direction so that the slit 35 opens most at the position farthest from the slit width holding portion 41.

  FIG. 6 (a) shows the present invention, in which the member widening portion 3a is provided in the shock absorbing member 33 at a substantially central position between the adjacent slit width holding portions 41, and the upper end of the shock absorbing member 33 and An impact absorbing member 33 having a lower end formed in a linear taper shape is shown. FIG. 6B shows a comparative example, in which the member widened portion 3a of the shock absorbing member 33 of the present invention has the same vertical width as the direction perpendicular to the slit longitudinal direction P1, and the slit length. An impact absorbing member 33 having a constant vertical width in the direction P1 is shown. In FIG. 6, the cord body 13 has a diameter r of 14 mm.

FIG. 7A shows the displacement of the cord 13 when the cord 13 moves in the slit longitudinal direction P1 in the narrow portion 37 in the shock absorbing member 33 shown in FIG. It is a figure which shows the relationship with the load required for a movement. As shown in FIG. 7A, the shock absorbing structure 3 includes the inlet portion 36 in the slit longitudinal direction P1 in the narrow portion 37 in both the present invention shown in FIG. 6A and the comparative example shown in FIG. 6B. In the vicinity of the slit width holding portion 41 on the side, the loads necessary for the cord-like body 13 to pass through the slit 35 are the maximum loads P _max and P _max ′. Further, in the shock absorbing structure 3, in the vicinity of the approximate center position of the plurality of adjacent slit width holding portions 41, the load necessary for the cord-like body 13 to pass through the slit 35 is the minimum load P _min , P _min ′. It becomes.

As shown in FIG. 7A, in the comparative example, the difference between the maximum load P _max ′ and the minimum load P _min ′ is large. However, in the present invention, the maximum load P _max and the minimum load are compared. It can be seen that the difference from P _min is small. In the present invention, since the difference between the maximum load P _max and the minimum load P _min is reduced, for example, as shown in FIG. 7 (b), the maximum load P _max of the comparative examples and the maximum load P _max of the present invention 'and so that the same, when setting a narrow slit width of the slit 35 in the present invention, minimum load P _min of Comparative example' it can be seen that the direction of minimum load P _min of the present invention than is remarkably large.

By the way, the impact absorbing structure 3 absorbs an impact force equal to the total load required when the cord-like body 13 moves the narrow portion 37 in the slit longitudinal direction P1. For this reason, the shock absorbing structure 3 needs to set the maximum load P _max so as not to break the cord-like body 13, while setting the minimum load P _min so as not to decrease as much as possible. Absorption performance can be exhibited.

Therefore, the shock absorbing structure 3 according to the present invention has a small difference between the maximum load P _max and the minimum load P _min as shown in FIG. 7 (a). Since the slit width of the slit 35 can be set as narrow as possible within a range in which the shape body 13 is not broken, the maximum load P _max can be set large, and further, the decrease in the minimum load P _min can be suppressed. It is possible to exhibit shock absorbing performance.

  The shock absorbing structure 3 according to the present invention can easily adjust the shock absorbing performance by adjusting the vertical width that is perpendicular to the slit longitudinal direction P1 of the shock absorbing member 33 using calipers or the like. Is possible. For this reason, the shock absorbing structure 3 according to the present invention does not require fine adjustment of the tightening force by bolts, caulking, or the like, and can easily obtain a desired shock absorbing performance. Moreover, the shock absorbing structure 3 according to the present invention can increase the rigidity in the out-of-plane direction of the shock absorbing member 33 by having the member widened portion 3a.

  Next, the shock absorbing structure 3 according to the second embodiment will be described. In addition, about the component same as the component mentioned above, the description below is abbreviate | omitted by attaching | subjecting the same code | symbol.

  In the second embodiment, the shock absorbing structure 3 according to the present invention further includes a position holding member 51 attached to the support 31 on the side of the shock absorbing member 33 as shown in FIGS. The shock absorbing structure 3 according to the present invention is held by the position holding member 51 in a state where the cord-like body 13 is slidable in the axial direction.

  The position holding member 51 uses a U-bolt, but is not limited to this, and any shape can be used. In the position holding member 51, both end portions 51 a of U-bolts are inserted into the column 11 as the support body 31 and the nut 52 is screwed. The position holding member 51 has a nut 52 so that the cord-like body 13 can be slid in the axial direction when the cord-like body 13 is inserted into the concave portion 51 b of the U-bolt and an impact force is applied to the cord-like body 13. The degree of screwing is adjusted.

  The position holding member 51 holds the cord-like body 13 on the front side in the direction in which the cord-like body 13 can move from the entrance portion 36 of the slit 35 when an impact force is applied. The position holding member 51 is disposed on both the left and right sides of the shock absorbing member 33 so that the concave portion 51b and the narrow portion 37 of the slit 35 are positioned substantially coaxially. The cord-like body 13 is disposed in the inlet portion 36 of the shock absorbing member 33, and is positioned in a convex shape while being held by the concave portions 51b of the two position holding members 51 on the front side in the direction in which the cord-like body 13 can move.

  As shown in FIG. 9, the shock absorbing structure 3 according to the present invention is formed between the supports 31 after the cord-like body 13 moves in the slit longitudinal direction P <b> 1 by the impact force as shown in FIG. 9. It becomes possible to lengthen the construction length of the cord-like body 13. For this reason, when the shock absorbing structure 3 according to the present invention is used for the protective fence 1 in the second embodiment, the inclination angle of the cord-like body 13 with respect to the straight line L1 parallel to the straight line passing through the adjacent support bodies 31 is used. It is possible to increase θ. At this time, in the shock absorbing structure 3 according to the present invention, in the second embodiment, as the inclination angle θ increases, the front-rear direction P2 component of the support 31 of the impact force acting as a tensile force on the cord-like body 13 increases. The impact force from the falling object A can be transmitted to the support 31 more effectively. Thereby, the shock absorbing structure 3 according to the present invention can effectively exhibit the shock absorbing performance by the support 31 in the second embodiment.

  By the way, the guard fence 1 generally has the cords 13 and 13 in the front-rear direction P2 of the support 31 when the cords 13 and the nets 15 having the same length are attached between the adjacent supports 31. When the net 15 is displaced, the cord 13 tends to break earlier than the net 15 when the net 15 is displaced to some extent. This is because the displacement amount in the front-rear direction P2 required to reach the maximum tension of the cord-like body 13 is generally smaller than the net body 15, and the cord-like body 13 breaks early, It becomes difficult to sufficiently exhibit the shock absorbing performance by the net body 15.

  In the second embodiment, the shock absorbing structure 3 according to the present invention can lengthen the installation length of the cord-like body 13 between the support bodies 31, so that it is necessary to reach the maximum tension in the front-rear direction. The displacement amount of P2 can be adjusted to the same extent between the cord-like body 13 and the net body 15. Thereby, the impact absorbing structure 3 according to the present invention can sufficiently exhibit the impact absorbing performance by both the cord-like body 13 and the net body 15 in the second embodiment.

In the second embodiment, the shock absorbing structure 3 according to the present invention can exhibit stable shock absorbing performance continuously against the impact force even if a part of the slit side surface 35a of the slit 35 is worn. It becomes. The shock absorbing structure 3 according to the present invention can exhibit shock absorbing performance over the entire length in the slit longitudinal direction P1, and has high shock absorbing performance because the difference between the maximum load P _max and the minimum load P _min is small. Can be achieved.

  Next, the shock absorbing structure 3 according to the third embodiment will be described. In addition, about the component same as the component mentioned above, the description below is abbreviate | omitted by attaching | subjecting the same code | symbol.

  In the third embodiment, as shown in FIG. 10, the shock absorbing structure 3 according to the present invention has a shock absorbing member 33 attached to a fixing plate 32 that is not joined to the support 31, and The suspended state is assumed. In the third embodiment, the shock absorbing structure 3 according to the present invention further includes a position holding member 51 attached to the support 31 on the side of the shock absorbing member 33. The cord-like body 13 is fixed to the support body 31 on both axial sides with respect to the shock absorbing member 33.

  In the third embodiment, the shock absorbing structure 3 according to the present invention is in a state in which the fixing plate 32 is suspended and supported by the cable-like body 13, and thus is not limited to the end of the cable-like body 13 or the vicinity of the support body 31. The shock absorbing member 33 can be attached to any part of the cord-like body 13 and can be used without being restricted by the length of the cord-like body 13.

In the third embodiment, the shock absorbing structure 3 according to the present invention can exhibit stable shock absorbing performance continuously against the impact force even if a part of the slit side surface 35a of the slit 35 is worn. It becomes. The shock absorbing structure 3 according to the present invention can exhibit shock absorbing performance over the entire length in the slit longitudinal direction P1, and has high shock absorbing performance because the difference between the maximum load P _max and the minimum load P _min is small. Can be achieved. Furthermore, the shock absorbing structure 3 according to the present invention can effectively exert the shock absorbing performance by the support 31, and the shock absorbing performance by both the cord-like body 13 and the net body 15 can be sufficiently obtained. It will be possible to demonstrate.

  Next, the shock absorbing structure 3 according to the fourth embodiment will be described. In addition, about the component same as the component mentioned above, the description below is abbreviate | omitted by attaching | subjecting the same code | symbol.

  In the fourth embodiment, the shock absorbing structure 3 according to the present invention includes slit width holding portions 41 on both sides of the slit 35 provided in the shock absorbing member 33 as shown in FIG. Further, a cord-like body fixing portion 40 provided in a hole shape through the plate material is further provided. The shock absorbing member 33 is attached to the cable-shaped body 13 without being joined to the support body 31, and is in a state of being supported by being supported by the cable-shaped body 13. The cord-like body fixing portion 40 is to fix the cord-like body 13 with the caulking metal fitting 16 as the position holding member 51 being sandwiched. The cord-like body fixing portion 40 is not limited to this, and the cord-like body 13 may be fixed by welding or the like.

  The cord-like body 13 is sandwiched between the caulking metal fittings 16 as the position holding member 51 at the entrance portion 36 and fixed in the axial direction, and the installation length is increased on the front side or the rear side of the shock absorbing member 33. In this state, the position is held. The cord-like body 13 moves from the inlet portion 36 to the narrow portion 37 while being sandwiched between the crimping fittings 16 as the position holding member 51 when an impact force is applied. The cord-like body 13 is fixed to the support body 31 on both axial sides with respect to the shock absorbing member 33.

In the fourth embodiment, the shock absorbing structure 3 according to the present invention can exhibit stable shock absorbing performance continuously against the impact force even if a part of the slit side surface 35a of the slit 35 is worn. It becomes. The shock absorbing structure 3 according to the present invention can exhibit shock absorbing performance over the entire length in the slit longitudinal direction P1, and has high shock absorbing performance because the difference between the maximum load P _max and the minimum load P _min is small. Can be achieved. Furthermore, the shock absorbing structure 3 according to the present invention can effectively exert the shock absorbing performance by the support 31, and the shock absorbing performance by both the cord-like body 13 and the net body 15 can be sufficiently obtained. It will be possible to demonstrate. Furthermore, the shock absorbing structure 3 according to the present invention is not limited to the end of the cord-like body 13 and the vicinity of the support 31, and the shock absorbing member 33 can be attached to any part of the cord-like body 13. It can be used without being restricted by the length of the body 13.

  Next, the shock absorbing structure 3 according to the fifth embodiment will be described. In addition, about the component same as the component mentioned above, the description below is abbreviate | omitted by attaching | subjecting the same code | symbol.

  In the fifth embodiment, as shown in FIGS. 12 to 15, the shock absorbing structure 3 according to the present invention is provided with a slit 35, and a loop portion 14 in which a part of the cord-like body 13 is ring-shaped is wound. The shock absorbing member 33 and a slit width holding portion 41 that holds the slit width of the slit 35 are provided. In the fifth embodiment, the shock absorbing structure 3 according to the present invention includes a connecting member 43 that is attached across the upper portion 33a and the lower portion 33b of the shock absorbing member 33 with the slit 35 interposed therebetween as the slit width holding portion 41. Function. The shock absorbing structure 3 according to the present invention is not limited to this, and a structure to which the connecting member 43 is not attached can be used. Further, in the fifth embodiment, the shock absorbing structure 3 according to the present invention includes a fixing member 65 for fixing the cord 13 to the support 31 on both sides in the axial direction of the cord 13 with respect to the shock absorbing member 33. Furthermore, it can be provided.

  The shock absorbing member 33 is provided with a slit 35 along a portion around which the loop portion 14 of the cord-like body 13 is wound. The shock absorbing member 33 is a cylindrical body, but is not limited thereto, and a bent body obtained by bending a plate material into a U shape, a V shape, or the like, a flat plate material, or the like may be used. . In the fifth embodiment, the shock absorbing member 33 is attached to the cord-like body 13 without being joined to the support body 31 and is suspended and supported by the cord-like body 13. FIG. 14A schematically shows the shock absorbing member 33 developed along the circumferential direction, and alternate long and short dash lines a to d in FIGS. 14A and 14B. The positional relations correspond to each other.

  The shock absorbing member 33 has a member widening portion 3a provided at a position away from the slit width holding portion 41 in the slit longitudinal direction P1. The impact absorbing member 33 is formed by reducing the width in the vertical direction, which is a direction perpendicular to the slit longitudinal direction P1, from the member widened portion 3a at a position closer to the slit width holding portion 41 in the slit longitudinal direction P1 than the member widened portion 3a. The member narrow portion 3b is provided with lower rigidity in the in-plane direction than the member wide portion 3a. The impact absorbing member 33 is formed with a curved taper at the upper and lower ends, and is provided with a member widened portion 3a and a member narrowed portion 3b. The impact absorbing member 33 is not limited to this, and the upper end and the lower end may be formed in a linear taper shape.

  In the fifth embodiment, the slit width holding portion 41 is composed of a connecting portion 42 that connects the upper portion 33a and the lower portion 33b with the slit 35 of the shock absorbing member 33 therebetween, and is connected to the slit 35. It is provided on both sides of the slit longitudinal direction P1.

  The connecting member 43 includes a set of plate members 44 joined to the upper portion 33a and the lower portion 33b of the shock absorbing member 33, and bolts 46 inserted into the set of plate members 44 and screwed with nuts 45. . The connecting member 43 is not limited to this, and may be composed of, for example, a plate member that is disposed from the upper portion 33a to the lower portion 33b of the shock absorbing member 33 and joined to the upper portion 33a and the lower portion 33b of the shock absorbing member 33. . Moreover, the connection member 43 is not restricted to this, You may be comprised by combining a some board | plate material, a volt | bolt, a nut, etc. FIG. The nut 45 is screwed to such an extent that the slit width of the slit 35 can be sufficiently maintained.

  The slit 35 is formed only in a range over a part of the circumferential direction of the shock absorbing member 33. The slit 35 is not limited to this, and may be formed in a range over the entire circumferential direction of the shock absorbing member 33. The slit 35 includes a narrow portion 37 formed with a slit width smaller than the diameter r of the cord-like body 13 and inlet portions 36 formed on both side portions of the narrow portion 37 in the slit longitudinal direction P1. Since the narrow portion 37 is formed to have a slit width smaller than the diameter r of the cord-like body 13, when the cord-like body 13 moves inside by the impact force, the narrow portion 37 is opposed to a pair of opposing slit side surfaces 35a. The cord-like body 13 can be slid reliably.

  The slit 35 is a part where the cord 13 starts to enter the narrow portion 37 when the impact force is applied for the purpose of reducing the entry resistance at the initial stage when the impact force is applied to the cord 13. In FIG. 8, a tapered guide portion (not shown) may be formed so that the slit width becomes narrower toward the front in the entry direction of the cord-like body 13.

  In the fifth embodiment, as shown in FIG. 15, in the fifth embodiment, the intermediate portion of the loop portion 14 is wound around the narrow portion 37 of the slit 35, and both end portions of the loop portion 14 are in the slit longitudinal direction P1. The inlet portion 36 on one end side and the inlet portion 36 on the other end side are inserted.

  In the fifth embodiment, the shock absorbing structure 3 according to the present invention is such that when the falling object A is captured by the protective surface, the impact force from the falling object A acts as the axial tensile force of the cord-like body 13. To do. As a result, the cord-like body 13 tries to deform so that the loop portion 14 is reduced in diameter, and a part of the cord-like body 13 intersecting with the slit 35 causes the narrow portion 37 of the slit 35 to extend in the slit longitudinal direction P1. Will move. At this time, in the shock absorbing structure 3 according to the present invention, the cord-like body 13 slides on a pair of opposed slit side surfaces 35 a of the narrow portion 37, and the gap between the pair of slit side surfaces 35 a and the cord-like body 13. The impact force of the fallen object A can be absorbed by this friction.

In the fifth embodiment, the shock absorbing structure 3 according to the present invention can extend the length of the cable-like body 13 between the support bodies 31 after the movement of the cable-like body 13 by the impact force. It is possible to effectively exhibit the shock absorbing performance by 31 and to sufficiently exhibit the shock absorbing performance by both the cord-like body 13 and the net body 15. The shock absorbing structure 3 according to the present invention can continuously exhibit a shock absorbing performance that is stable against an impact force even when a part of the slit side surface 35a of the slit 35 is worn. The shock absorbing structure 3 according to the present invention can exhibit shock absorbing performance over the entire length in the slit longitudinal direction P1, and has high shock absorbing performance because the difference between the maximum load P _max and the minimum load P _min is small. Can be achieved. Furthermore, the shock absorbing structure 3 according to the present invention is not limited to the end of the cord-like body 13 and the vicinity of the support 31, and the shock absorbing member 33 can be attached to any part of the cord-like body 13. It can be used without being restricted by the length of the body 13.

  In the fifth embodiment, the shock absorbing structure 3 according to the present invention restrains the inclination of the central axis of the shock absorbing member 33 with respect to the axial direction of the cord 13 when an impact force acts on the cord 13. A restraining member (not shown) may be attached. The restraining member is composed of a pair of plate members arranged so as to sandwich the two portions of the cord-like body 13 located away from the intersecting portion of the loop portion 14 from both sides in the axial direction of the shock absorbing member 33. The Thereby, the shock absorbing structure 3 according to the present invention is configured such that when the rotational load acts on the shock absorbing member 33 due to the impact force acting on the cord 13, the central axis of the shock absorbing member 33 is the cord 13. Even if it is tilted with respect to the axial direction, it is possible to restrain further inclination by the cord-like body 13 coming into contact with the restraining member.

  The shock absorbing structure 3 according to the present invention provides a larger shock absorbing performance as the slit width of the narrow portion 37 of the slit 35 becomes narrower. On the other hand, the possibility that the cord-like body 13 breaks increases. End up. In the impact absorbing structure 3 according to the present invention, when the cord-like body 13 is broken, a sufficient frictional force between the slit side surface 35a of the narrow portion 37 and the cord-like body 13 cannot be obtained, and a desired impact absorbing performance is obtained. It cannot be obtained. For this reason, the narrow portion 37 has a slit width smaller than the diameter r of the cord-like body 13 and exerts an impact force in order to continuously exhibit a shock absorbing performance against the impact force. Further, the cord 13 is formed to have a slit width that allows the narrow portion 37 to move in the slit longitudinal direction P1 without breaking. For example, as an embodiment according to the present invention, when a steel wire is used for the cord-like body 13 and a steel material is used for the shock absorbing member 33, the narrow portion 37 is smaller than the diameter r of the cord-like body 13 and has a diameter r of 50. Preferably, the slit width is in the range of at least%. Note that when the material is used, the narrow portion 37 has a high possibility of breaking the cord-like body 13 when the slit width is less than 50% of the diameter r of the cord-like body 13, and a desired impact. Absorption performance may not be obtained stably.

  Although not shown in the drawings, the shock absorbing structure 3 according to the present invention is a bent portion in which an intermediate portion of a plate material is bent inward as an impact absorbing member 33 that is attached to a support 11 as a support 31 by welding or the like. And what was comprised as a bending body which has the overhang | projection part which bent the both ends of the board | plate material outside may be used. The overhanging portion is attached to the support 31 by joining means such as welding after contacting the support 31. The slit 35 is provided so as to extend from the bent portion toward both sides.

  As shown in FIG. 16, the guard fence 1 may have a structure in which the cord-like body 13 is spirally wound around the adjacent column 11. In the example shown in the figure, the cord-like body 13 is wound so as to intersect between adjacent struts 11, and the position of the cord-like body 13 is held with respect to the strut 11 through a position holding member 72 attached to the strut 11.

  As mentioned above, although the example of embodiment of this invention was demonstrated in detail, all the embodiment mentioned above showed only the example of actualization in implementing this invention, and these are the technical aspects of this invention. The range should not be construed as limiting.

1: Guard fence 11: Support column 13: Cord body 14: Loop part 15: Net body 16: Caulking metal fitting 3: Shock absorbing structure 3a: Member widening part 3b: Member narrow part 31: Support 32: Fixing plate 33: Shock absorbing member 33a: Upper portion of impact absorbing member 33b: Lower portion of impact absorbing member 35: Slit 35a: Slit side surface 35b: Slit bottom surface 36: Entrance portion 37: Narrow portion 40: Cord-like body fixing portion 41: Slit width holding portion 42: connecting portion 43: connecting member 44: plate member 45 of connecting member: nut 46 of connecting member: bolt 51 of connecting member: position holding member 51a: both ends 51b of position holding member: recessed portion 65 of position holding member: fixing member 72: Column holding member A: Falling object P1: Slit longitudinal direction P2: Front-rear direction P3: Action direction _Pmax : Maximum load _Pmin : Minimum load

Claims (6)

A shock absorbing structure for a cable-shaped body for absorbing an impact force when a fallen object collides with a cable-shaped body constructed between supports,
An impact absorbing member provided with a slit, and a slit width holding portion for holding the slit width of the slit,
The slit is formed with an entrance portion where the cord-like body is disposed and a slit width smaller than the diameter of the cord-like body, and the cord-like body is movable from the entrance portion when the impact force is applied. A narrow portion extending in the direction of
The impact absorbing member is a member widened portion provided away from the slit width holding portion in the longitudinal direction of the slit, and a member provided on the slit width holding portion side in the longitudinal direction of the slit from the member widened portion. Having a narrow portion,
The impact-absorbing structure for a cord-like body, wherein rigidity in the in-plane direction of the narrow member is lower than that of the wide member.
The shock absorbing member is a tubular body around which a loop portion in which a part of the cord-like body is ring-shaped is wound, and the slit forms the loop portion on the outer peripheral surface of the tubular body. The loop portion is provided along a body, and an intermediate portion of the loop portion is wound around the narrow portion, and both end portions of the loop portion are inserted into the inlet portion. The cord-shaped shock absorbing structure described.
The member narrow portion is provided with a lower rigidity in the in-plane direction than the member widened portion by making the width in the direction perpendicular to the longitudinal direction of the slit of the shock absorbing member smaller than the member widened portion. The impact-absorbing structure for a cord-like body according to claim 1 or 2. The member narrow width part is provided with lower rigidity in the in-plane direction than the member widened part by making the width in the thickness direction of the shock absorbing member smaller than the member widened part. The shock absorbing structure for a cord-like body according to 1 or 2. The slit width holding portion is provided at an interval in the longitudinal direction of the slit with respect to the slit,
The said member widening part is provided in the approximate center position of the said slit width holding | maintenance part adjacent to the longitudinal direction of the said slit. The impact absorption of the cord-like body of any one of Claims 1-4 characterized by the above-mentioned. Construction. A plurality of supports standing upright at intervals in the lateral direction, and a cord-like body constructed between the plurality of supports,
The guard fence according to any one of claims 1 to 5, wherein the cord-like body has a shock-absorbing structure according to any one of claims 1 to 5.

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