JP2018025088A - Fall prevention device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fall prevention device capable of preventing falling of a component part during construction work.SOLUTION: The fall prevention device includes: a beam which is bridged between two elevated roads; and a panel which is fixed to a beam by a fastening member and a nut engaged with the fastening member. The beam includes: a groove formed in an upper plate which comes into contact with the panel; and a nut holder which is engaged with the groove. The nut holder is formed in the surface close to the panel and has a concave for housing the nut.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a fall prevention device.

  On an expressway or the like, two elevated roads may be separated. A certain gap is provided between the two elevated roads as a median strip. For this reason, in order to prevent a person or an object from falling into the gap, a member that closes the gap is attached to the elevated road. Patent Document 1 and Patent Document 2 describe a metal panel that is bridged from one elevated road to the other elevated road.

Japanese Utility Model Publication No. 63-14612 JP-A-8-35208

  If the panels described in Patent Literature 1 and Patent Literature 2 are fixed between elevated roads, it is possible to prevent a person or an object from falling. However, during the operation of fixing the panel and the beam, there is a possibility that parts for fastening will fall.

  This invention is made | formed in view of said subject, Comprising: It aims at providing the fall prevention apparatus which suppresses the fall of the components at the time of construction.

  In order to achieve the above object, a fall prevention device according to one aspect of the present invention is a panel fixed to the beam by a beam spanned between two elevated roads, and a fastening member and a nut meshing with the fastening member. The beam includes a groove provided on the upper plate in contact with the panel, and a nut holder fitted in the groove, and the nut holder is provided on a surface near the panel, A recess for receiving the nut is provided.

  Thereby, since the nut is accommodated in the recessed part, the fall of the nut is suppressed. Moreover, dropping of the fastening member is hindered by the panel. Therefore, the fall prevention apparatus can suppress the fall of the components at the time of construction.

  As said aspect of a fall prevention apparatus, the said beam is provided with the 1st long hole extended in the 1st direction parallel to the longitudinal direction of the said beam, The longitudinal direction of the said recessed part is along the said 1st direction, The panel preferably includes a second slot extending in a second direction perpendicular to the first direction.

  As a result, the nut can move in the first direction inside the recess. At the time of construction of the panel, the position of the panel in the X direction and the direction of the Y direction using the first elongated hole that is long in the first direction, the nut that can move in the first direction, and the second elongated hole that is long in the second direction. The position can be adjusted.

  As said aspect of a fall prevention apparatus, it is desirable that one end of the beam is fixed to one of the two elevated roads, and the other end of the beam is not fixed to the other of the two elevated roads. .

  Thereby, even when the distance between two elevated roads fluctuates due to a strong wind or an earthquake, an excessive load is prevented from being applied to the beam.

  As said aspect of a fall prevention apparatus, the said beam is provided with the panel holding part which protrudes from the said upper board, The said panel holding part extends from the said base part in the direction which cross | intersects with respect to the said upper board, and the said base part. A lid portion extending in a direction perpendicular to the longitudinal direction of the beam, and the other beam from the lid portion of one of the two beams supporting one of the panels. The distance to the lid is preferably smaller than the length of the panel in a direction perpendicular to the longitudinal direction of the beam.

  Accordingly, the panel does not come out from between the lid portion and the upper plate while the panel is being slid and while the panel is being fixed. Therefore, it is suppressed that a panel falls at the time of construction of a panel.

  A fall prevention device according to another aspect of the present invention includes a beam spanned between two elevated roads and a panel fixed to the beam, and one end of the beam is one of the two elevated roads. The other end of the beam is not fixed to the other of the two elevated roads.

  Thereby, even when the distance between two elevated roads fluctuates due to a strong wind or an earthquake, an excessive load is prevented from being applied to the beam.

  ADVANTAGE OF THE INVENTION According to this invention, the fall prevention apparatus which suppresses the fall of components at the time of construction can be provided.

FIG. 1 is a schematic diagram of a fall prevention device according to the present embodiment. FIG. 2 is a perspective view of the fall prevention device according to the present embodiment. FIG. 3 is a front view of the fall prevention device according to the present embodiment. FIG. 4 is a side view of the fall prevention device according to the present embodiment. FIG. 5 is a side view of the fall prevention device according to the present embodiment. 6 is a cross-sectional view taken along line AA in FIG. FIG. 7 is an exploded perspective view of the beam according to the present embodiment. FIG. 8 is a plan view of a beam according to the present embodiment. FIG. 9 is a plan view of the nut holder according to the present embodiment. FIG. 10 is a plan view of the first cover according to the present embodiment. FIG. 11 is a plan view of the second cover according to the present embodiment. FIG. 12 is a plan view of the panel according to the present embodiment. FIG. 13 is a perspective view for explaining a construction method of the fall prevention device according to the present embodiment. FIG. 14 is a perspective view for explaining a construction method of the fall prevention device according to the present embodiment. FIG. 15 is a perspective view for explaining a construction method of the fall prevention device according to the present embodiment. FIG. 16 is a perspective view for explaining a construction method of the fall prevention device according to the present embodiment. FIG. 17 is a perspective view for explaining a construction method of the fall prevention device according to the present embodiment. FIG. 18 is a perspective view for explaining a construction method of the fall prevention device according to the present embodiment. FIG. 19 is a front view of a beam according to a modification. FIG. 20 is a front view of beams and panels according to a modification.

  Hereinafter, the present invention will be described in detail with reference to the drawings. The present invention is not limited by the following modes for carrying out the invention (hereinafter referred to as embodiments). In addition, constituent elements in the following embodiments include those that can be easily assumed by those skilled in the art, those that are substantially the same, and those in a so-called equivalent range. Furthermore, the constituent elements disclosed in the following embodiments can be appropriately combined.

(Embodiment)
FIG. 1 is a schematic diagram of a fall prevention device according to the present embodiment. FIG. 2 is a perspective view of the fall prevention device according to the present embodiment. FIG. 3 is a front view of the fall prevention device according to the present embodiment. FIG. 4 is a side view of the fall prevention device according to the present embodiment. FIG. 5 is a side view of the fall prevention device according to the present embodiment. 6 is a cross-sectional view taken along line AA in FIG. FIG. 7 is an exploded perspective view of the beam according to the present embodiment. FIG. 8 is a plan view of a beam according to the present embodiment. FIG. 9 is a plan view of the nut holder according to the present embodiment. FIG. 10 is a plan view of the first cover according to the present embodiment. FIG. 11 is a plan view of the second cover according to the present embodiment. FIG. 12 is a plan view of the panel according to the present embodiment.

  As shown in FIG. 1, the fall prevention device 1 according to this embodiment is installed between an elevated road 11 and an elevated road 12. A gap is provided as a central separation between the shoulder 101 of the elevated road 11 and the shoulder 102 of the elevated road 12. If the gap between the road shoulder 101 and the road shoulder 102 remains open, a person or an object may fall into the gap. The fall prevention device 1 is a device for suppressing a person or an object from falling into a gap between the road shoulder 101 and the road shoulder 102.

  In the following description, an XYZ orthogonal coordinate system is used. The X axis is an axis along the longitudinal direction of the elevated road 11 and the elevated road 12. The Y axis is an axis that is orthogonal to the X axis and along a straight line connecting the road shoulder 101 and the road shoulder 102. The Z axis is an axis orthogonal to both the X axis and the Y axis. The direction along the X axis is described as the X direction, the direction along the Y axis is described as the Y direction, and the direction along the Z axis is described as the Z direction. A direction from the shoulder 101 to the shoulder 102 in the Y direction is defined as a + Y direction. The right direction when facing the + Y direction is the + X direction. The upward direction when facing the + Y direction is the + Z direction.

  As shown in FIG. 2, the base plate 10, the beam 2 a, the beam 2 b, the first cover 71, the second cover 72, and the panel 4 are provided. FIG. 2 shows a part of the fall prevention device 1. In the fall prevention device 1, a plurality of units each including the base plate 10, the beam 2a, the beam 2b, the first cover 71, the second cover 72, and the panel 4 shown in FIG. 2 are arranged in the X direction.

  The base plate 10 is a member that supports the beam 2a and the beam 2b. As shown in FIG. 3, the base plate 10 is a substantially T-shaped member as viewed from the Y direction. The base plate 10 is fixed to the road shoulder 101 by anchor bolts. 3 shows the fall prevention device 1 as seen from the road shoulder 101 side, and the first cover 71 is omitted.

  The beam 2 a is bridged between the road shoulder 101 and the road shoulder 102. As shown in FIG. 3, the beam 2a is a substantially C-shaped member when viewed from the Y direction. For example, the beam 2a is an aluminum extruded profile. The beam 2 a is supported by the base plate 10. One end of the beam 2a (the end on the road shoulder 101 side) is fixed to the base plate 10 by a fastening member 19 as shown in FIGS. For example, the fastening member 19 includes a bolt and a nut. The other end of the beam 2a (the end portion on the road shoulder 102 side) is not fixed to the road shoulder 102 as shown in FIG. There is a gap between the other end of the beam 2 a and the road shoulder 102. In other words, the beam 2 a can slide in the Y direction relative to the road shoulder 102.

  The beam 2 b is bridged between the road shoulder 101 and the road shoulder 102. The beam 2b is a member having a shape that is plane-symmetric with the beam 2a, with a plane orthogonal to the X axis as a symmetry plane. For example, the beam 2b is an aluminum extruded profile. The beam 2 b is supported by the base plate 10. One end of the beam 2b (end on the road shoulder 101 side) is fixed to the base plate 10 together with the beam 2a by the fastening member 19. The other end of the beam 2b (the end portion on the road shoulder 102 side) is not fixed to the road shoulder 102 like the beam 2a. There is a gap between the other end of the beam 2 b and the road shoulder 102. In other words, the beam 2 b can slide in the Y direction relative to the road shoulder 102. As shown in FIG. 5, a spacer 28 is provided between the beam 2a and the beam 2b. The beam 2b and the spacer 28 are fixed to the beam 2a by the fastening member 29.

  The beam 2b has the same configuration as the beam 2a except that the beam 2b has a shape symmetrical to the beam 2a. Since the following detailed description regarding the beam 2a is applicable to the beam 2b, the detailed description of the beam 2b is omitted.

  As shown in FIG. 7, the beam 2 a includes a vertical plate 201, an upper plate 202, a lower plate 203, and a nut holder 3. The vertical plate 201 is a plate perpendicular to the X axis. The vertical plate 201 is provided with a hole for attaching the fastening member 19. The upper plate 202 is a plate perpendicular to the Z axis, and protrudes from the end of the vertical plate 201 in the + Z direction in the + X direction. The lower plate 203 is a plate perpendicular to the Z axis, and protrudes from the −Z direction end of the vertical plate 201 in the + X direction.

  As shown in FIG. 7, the upper plate 202 includes a plurality of first long holes 25, holes 26, and grooves 21. The longitudinal direction of the first elongated hole 25 is along the Y direction. The plurality of first long holes 25 are arranged in the Y direction at intervals as shown in FIG. The length in the Y direction of the first long hole 25 (first long hole 252) located closest to the + Y direction side is larger than the length in the Y direction of the other first long holes 25. The hole 26 is disposed between the two first elongated holes 25. The groove 21 is provided on the surface on the −Z direction side. The groove 21 extends in the Y direction. As shown in FIG. 6, the groove 21 includes a narrow portion 21a and a wide portion 21b. The wide portion 21b is located on the + Z direction side of the narrow portion 21a. The width of the wide portion 21b in the X direction is larger than the width of the narrow portion 21a in the X direction. In FIG. 6, the nut 33 and the fastening member 49 shown in FIG. 4 are omitted.

  As shown in FIG. 7, the nut holder 3 is a long member along the Y direction. The length of the nut holder 3 in the Y direction is substantially equal to the length of the beam 2a in the Y direction. As shown in FIG. 6, the nut holder 3 is fitted in the groove 21. The nut holder 3 includes a plurality of concave portions 31, a plurality of long holes 32, two projecting portions 30, and a hole 36.

  As shown in FIG. 6, the recess 31 is provided on the surface of the nut holder 3 on the side close to the panel 4. The recess 31 houses a nut 33. That is, the nut 33 is disposed inside the recess 33. The shape of the recess 31 viewed from the Z direction is an ellipse. The longitudinal direction of the recess 31 is along the Y direction. For example, the length of the recess 31 in the Y direction is larger than the length of the first long hole 25 in the Y direction. The plurality of recesses 31 are arranged in the Y direction at intervals as shown in FIG. The length in the Y direction of the recess 31 located closest to the + Y direction is larger than the length of the other recess 31 in the Y direction. The distance between the adjacent recesses 31 is substantially equal to the distance between the adjacent first long holes 25. The length of the recess 31 in the X direction is equal to or larger than the two-surface width of the nut 33.

  As shown in FIG. 6, the long hole 32 is provided on the bottom surface of the recess 31. The longitudinal direction of the long hole 32 is along the Y direction. For example, the length of the long hole 32 in the Y direction is substantially equal to the length of the first long hole 25 in the Y direction. The length of the long hole 32 in the X direction is smaller than the two-surface width of the nut 33.

  The nut 33 is disposed inside the recess 31. The nut 33 is, for example, a hex nut. The side surface of the nut 33 faces the inner wall of the recess 31 perpendicular to the X axis. Since the length of the elongated hole 32 in the X direction is smaller than the width of the two surfaces of the nut 33, the end surface of the nut 33 is in contact with the bottom surface of the recess 31. The nut 33 can move in the Y direction in the recess 31.

  As shown in FIG. 6, the protrusion 30 is provided at the end of the nut holder 3 in the + Z direction. One protrusion 30 protrudes in the + X direction. The other protrusion 30 protrudes in the −X direction. The protruding part 30 is located inside the wide part 21b. As shown in FIG. 6, the width L30 in the X direction from the tip of one protrusion 30 to the tip of the other protrusion 30 is larger than the width L21a in the X direction of the narrow portion 21a. Thereby, the nut holder 3 is held in the groove 21.

  As shown in FIG. 9, the hole 36 is disposed between the two recesses 31. The hole 36 is a female screw and overlaps the hole 26 of the upper plate 202. Fastening members 39 shown in FIGS. 4 and 5 are attached to the holes 36 and 26. The fastening member 39 is, for example, a flat head screw. The nut holder 3 is fixed to the beam 2a by the fastening member 39.

  As shown in FIG. 2, the first cover 71 is attached to the ends of the beams 2a and 2b on the −Y direction side. The first cover 71 is substantially L-shaped when viewed from the X direction. As shown in FIG. 10, the first cover 71 includes two long holes 711. The longitudinal direction of the long hole 711 is along the X direction. One elongated hole 711 overlaps the first elongated hole 251 (see FIG. 8) of the beam 2a. The other elongated hole 711 overlaps the first elongated hole 25 (first elongated hole 251) located on the most −Y direction side of the beam 2b. A fastening member 719 shown in FIG. 4 passes through the long hole 711, the first long hole 251, the nut 33, and the long hole 32. The fastening member 719 is, for example, a truss screw. When the fastening member 719 is engaged with the nut 33, the first cover 71 is fixed to the beam 2a and the beam 2b. Due to the long hole 711 long in the X direction and the first long hole 251 long in the Y direction, the position of the first cover 71 in the X direction and the Y direction can be adjusted during construction.

  As shown in FIG. 2, the second cover 72 is attached to the ends of the beams 2a and 2b on the + Y direction side. The second cover 72 is substantially L-shaped when viewed from the X direction. As shown in FIG. 11, the second cover 72 includes two long holes 721. The longitudinal direction of the long hole 721 is along the X direction. One elongated hole 721 overlaps the first elongated hole 252 (see FIG. 8) of the beam 2a. The other elongated hole 721 overlaps the first elongated hole 252 of the beam 2b. A fastening member 729 shown in FIG. 5 passes through the long hole 721, the first long hole 252, the nut 33, and the long hole 32. The fastening member 729 is, for example, a truss screw. When the fastening member 729 meshes with the nut 33, the second cover 72 is fixed to the beam 2a and the beam 2b. The position of the second cover 72 in the X direction and the Y direction can be adjusted during construction by the long hole 721 long in the X direction and the first long hole 252 long in the Y direction. The length of the first long hole 252 in the Y direction is larger than the length of the first long hole 251 in the Y direction. For this reason, the adjustable range of the position of the second cover 72 in the Y direction is larger than the adjustable range of the position of the first cover 71 in the Y direction.

  As shown in FIG. 2, the panel 4 is attached to the beam 2a and the beam 2b. The panel 4 is a plate perpendicular to the Z axis. The panel 4 is a striped plate formed of, for example, an aluminum alloy. As shown in FIG. 12, the panel 4 includes two notches 41, two notches 42, and a plurality of second long holes 45. The notch 41 is disposed at a position corresponding to the fastening member 719 and prevents interference between the panel 4 and the fastening member 719. The notch 42 is disposed at a position corresponding to the fastening member 729 and prevents interference between the panel 4 and the fastening member 729.

  As shown in FIG. 12, the longitudinal direction of the second elongated hole 45 is along the X direction. The plurality of second long holes 45 are arranged in two rows in the Y direction at intervals. The second long hole 45 in one row overlaps the first long hole 25 of the beam 2a. The second slot 45 in the other row overlaps the first slot 25 of the beam 2b. The fastening member 49 shown in FIGS. 4 and 5 passes through the second long hole 45, the first long hole 25, the nut 33, and the long hole 32. The fastening member 49 is, for example, a truss screw. When the fastening member 49 is engaged with the nut 33, the panel 4 is fixed to the beam 2a and the beam 2b. With the first long hole 25 and the second long hole 45, the position of the panel 4 in the X direction and the Y direction can be adjusted during construction. Further, since the elongated hole 32 is provided in the bottom surface of the recess 31 that holds the nut 33, the fastening member 49 can penetrate the nut holder 3. For this reason, the worker can tighten the fastening member 49 until the seating surface of the fastening member 49 contacts the surface of the panel 4.

  FIGS. 13 to 18 are perspective views for explaining a construction method of the fall prevention device according to the present embodiment. First, as shown in FIG. 13, the nut holder 3 is inserted into the groove 21. Specifically, the nut holder 3 is slid in the Y direction from the end of the groove 21. The nut holder 3 is inserted into the groove 21 until the hole 36 shown in FIG. 13 overlaps the hole 26 shown in FIG.

  Next, as shown in FIG. 14, the fastening member 39 is inserted into the hole 26. The fastening member 39 is engaged with the hole 36 overlapping the hole 26. Thereby, the nut holder 3 is positioned. Since the nut holder 3 cannot move in the Y direction, the nut holder 3 is prevented from falling off the beam 2a.

  The place where the step of inserting the nut holder 3 into the groove 21 and the step of inserting the fastening member 39 into the hole 26 are not particularly limited. These steps may be performed in a factory or the like, or may be performed on the elevated road 11.

  Next, as shown in FIG. 15, the beam 2 a and the beam 2 b are attached to the base plate 10. The number of the fastening members 19 that connect the beams 2a and 2b and the base plate 10 is one. The beam 2a and the beam 2b are connected in advance by a spacer 28 and a fastening member 29. The step of connecting the beams 2a and 2b and the base plate 10 with the fastening member 19 is performed in a state where the beams 2a and 2b are on the elevated road 11 over the entire length. Thereby, it is suppressed that the beam 2a and the beam 2b fall in the clearance gap between the elevated road 11 and the elevated road 12 in the middle of work.

  Next, as shown in FIG. 16, the beam 2 a and the beam 2 b are rotated around the fastening member 19. Thereby, the edge part on the opposite side to the base plate 10 of the beam 2a and the beam 2b is located on the elevated road 12. FIG. For the work of rotating the beam 2a and the beam 2b, for example, a belt sling or the like is used. Belt slings are hooked on the ends of the beams 2a and 2b opposite to the base plate 10. The beam 2a and the beam 2b rotate while an operator or a crane holds the belt sling hooked on the beam 2a and the beam 2b. Since one end of the beam 2a and the beam 2b is fixed to the base plate 10 by the fastening member 19, even if the belt sling is detached from the beam 2a and the beam 2b, the beam 2a and the beam 2b do not fall.

  Next, as shown in FIG. 17, the beam 2a and the beam 2b are positioned. Specifically, the beams 2 a and 2 b are connected to the base plate 10 by a plurality of fastening members 19. Thereby, the beam 2a and the beam 2b cannot be rotated.

  Next, as shown in FIG. 18, the first cover 71 is attached to the beam 2a and the beam 2b. An operator on the elevated road 11 uses the fastening member 719 to fix the first cover 71 to the beams 2a and 2b. The position in the X direction and the position in the Y direction of the first cover 71 are adjusted by using the long hole 711 (see FIG. 10) long in the X direction and the first long hole 251 long in the Y direction. As described above, the nut 33 is held at a position overlapping the first elongated hole 251. For this reason, it is sufficient for the worker to prepare at least the fastening member 719 as a part for fixing the first cover 71. The worker can fix the first cover 71 only by attaching the fastening member 719 from above. The presence of the nut holder 3 facilitates the work of fixing the first cover 71.

  Next, as shown in FIG. 18, the second cover 72 is attached to the beam 2a and the beam 2b. An operator on the elevated road 12 uses the fastening member 729 to fix the second cover 72 to the beams 2a and 2b. The position in the X direction and the position in the Y direction of the second cover 72 are adjusted using the long hole 721 (see FIG. 11) long in the X direction and the first long hole 252 long in the Y direction. As described above, the nut 33 is held at a position overlapping the first elongated hole 252. For this reason, it is sufficient for the worker to prepare at least the fastening member 729 as a part for fixing the second cover 72. An operator can fix the second cover 72 only by attaching the fastening member 729 from above. The presence of the nut holder 3 facilitates the operation of fixing the second cover 72.

  Finally, the panel 4 is attached to the beam 2a and the beam 2b. An operator uses the fastening member 49 to fix the panel 4 to the beams 2a and 2b. The position of the panel 4 in the X direction and the direction of the Y direction using the second long hole 45 (see FIG. 12) long in the X direction, the first long hole 25 long in the Y direction, and the nut 33 movable in the Y direction. The position is adjusted. As described above, the nut 33 is held at a position overlapping the first long hole 25. For this reason, it is sufficient for the worker to prepare at least the fastening member 49 as a component for fixing the panel 4. An operator can fix the panel 4 only by attaching the fastening member 49 from above. The presence of the nut holder 3 makes it easy to fix the panel 4.

  As described above, in the fall prevention device 1, the beam 2a, the beam 2b, the first cover 71, the second cover 72, and the panel 4 are assembled on site (the elevated road 101 or the elevated road 102). For this reason, each member conveyed to the field from a factory etc. becomes small and becomes light. As a result, construction efficiency is improved.

  It should be noted that a gap is not necessarily provided between the road shoulder 102 side ends of the beams 2a and 2b and the road shoulder 102. For example, the fall prevention device 1 may include a spacer that fills a gap between the road shoulder 102 side ends of the beams 2 a and 2 b and the road shoulder 102. In this case, the lower plate 203 of the beam 2a and the beam 2b contacts the spacer, but the lower plate 203 is not fixed to the spacer. For this reason, even when a spacer is provided, the beam 2a and the beam 2b can slide relative to the road shoulder 102 in the Y direction.

  The fall prevention device 1 does not necessarily have to include the first cover 71 and the second cover 72. The fall prevention device 1 only needs to include at least the beams 2 a and 2 b and the panel 4. However, the presence of the first cover 71 and the second cover 72 makes it difficult to see the space below the panel 4 from the road shoulder 101 and the road shoulder 102. It is preferable in appearance that the first cover 71 and the second cover 72 are provided.

  As described above, the fall prevention device 1 includes the beams 2 a and 2 b and the panel 4. The beam 2 a and the beam 2 b are bridged between the elevated road 11 and the elevated road 12. The panel 4 is fixed to the beam 2 a and the beam 2 b by a fastening member 49 and a nut 33 that meshes with the fastening member 49. The beam 2 a and the beam 2 b include a groove 21 provided in the upper plate 202 in contact with the panel 4, and a nut holder 3 fitted in the groove 21. The nut holder 3 is provided on the surface on the side close to the panel 4 and includes a recess 31 that accommodates the nut 33.

  Thereby, since the nut 33 is accommodated in the recessed part 31, the fall of the nut 33 is suppressed. Further, the panel 4 prevents the fastening member 49 from dropping. Therefore, the fall prevention apparatus 1 can suppress the fall of the components at the time of construction.

  Moreover, in the fall prevention device 1, the beam 2a and the beam 2b are provided with the 1st long hole 25 extended in the 1st direction (Y direction) parallel to the longitudinal direction of the beam 2a and the beam 2b. The longitudinal direction of the recess 31 is along the first direction (Y direction). The panel 4 includes a second elongated hole 45 extending in a second direction (X direction) perpendicular to the first direction (Y direction).

  Thereby, the nut 33 can move in the first direction (Y direction) inside the recess 31. During construction of the panel 4, the first long hole 25 that is long in the first direction (Y direction), the nut 33 that can move in the first direction (Y direction), and the second long hole that is long in the second direction (X direction) 45, the position in the X direction and the position in the Y direction of the panel 4 can be adjusted.

  In the fall prevention device 1, one end of the beam 2a and the beam 2b is fixed to one of the two elevated roads (the elevated road 11). The other ends of the beams 2a and 2b are not fixed to the other of the two elevated roads (the elevated road 12).

  Thereby, even when the distance between the two elevated roads (the elevated road 11 and the elevated road 12) fluctuates due to a strong wind or an earthquake, an excessive load is prevented from being applied to the beams 2a and 2b.

(Modification)
FIG. 19 is a front view of a beam according to a modification. FIG. 20 is a front view of beams and panels according to a modification. Note that the same components as those described in the above-described embodiment are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIG. 19, the beam 2A of the modification includes a vertical plate 201A, an upper plate 202A, a lower plate 203A, and a panel holding unit 22. The vertical plate 201A is a plate perpendicular to the X axis. A hole for attaching the fastening member 19 is provided in the vertical plate 201A. The vertical plate 201 </ b> A is fixed to the base plate 10 by the fastening member 19. The vertical plate 201A is displaced by the thickness of the base plate 10 with respect to the center of the upper plate 202A in the X direction. The upper plate 202A is a plate perpendicular to the Z axis, and protrudes in the + X direction and the −X direction from the end in the + Z direction of the vertical plate 201A. The lower plate 203A is a plate perpendicular to the Z-axis, and protrudes in the + X direction from the end portion in the −Z direction of the vertical plate 201A. The lower plate 203A is provided to improve the strength of the beam 2A. The beam 2A is, for example, an aluminum extruded profile.

  The upper plate 202A includes a plurality of first long holes 25, holes 26, and grooves 21 similar to the upper plate 202 described above. In the upper plate 202A, there are two rows of a plurality of first long holes 25 arranged in the Y direction. The first long hole 25 in one row corresponds to the first long hole 25 of the beam 2a described above, and the first long hole 25 in the other row corresponds to the first long hole 25 of the beam 2b described above. The upper plate 202A includes two grooves 21. One groove 21 corresponds to the groove 21 of the beam 2a described above, and the other groove 21 corresponds to the groove 21 of the beam 2b described above.

  As shown in FIG. 19, the panel holding part 22 includes a base part 221 and a lid part 222. The base 221 extends in the + Z direction from the middle of the upper plate 202A in the X direction. The lid 222 extends from the base 221 in the + X direction and the −X direction. For this reason, the panel holding part 22 seen from the Y direction is substantially T-shaped as shown in FIG. For example, the length of the panel holding portion 22 in the Y direction is the same as the length of the upper plate 202A in the Y direction.

  As shown in FIG. 20, the distance in the X direction from the lid 222 of one beam 2A of the two beams 2A supporting one panel 4 to the lid 222 of the other beam 2A is a distance L222. . At this time, the distance L222 is smaller than the length L4 of the panel 4 in the X direction.

  When the panel 4 is constructed in the modified example, the panel 4 is inserted between the upper plate 202A and the lid portion 222 from the road shoulder 101 side or the road shoulder 102 side. Then, the panel 4 is slid in the Y direction. After the panel 4 reaches a predetermined position, the panel 4 is fixed by a fastening member 49 (see FIG. 2).

  The panel holding part 22 does not necessarily have to be formed integrally with the upper plate 202A. For example, the panel holding part 22 may be manufactured as a separate member from the upper plate 202A, and may be fixed to the upper plate 202A with bolts or the like. Moreover, the panel holding | maintenance part 22 is applicable also to the beam 2a and beam 2b mentioned above. In this case, the panel holding part 22 may be provided on one of the upper plate 202 of the beam 2a and the upper plate 202 of the beam 2b.

  The length of the panel holding portion 22 in the Y direction may not be the same as the length of the upper plate 202A in the Y direction. For example, the length of the panel holding unit 22 in the Y direction may be shorter than the length of the upper plate 202A in the Y direction. Thereby, the beam 2A is reduced in weight. The beam 2 </ b> A may include a plurality of panel holding portions 22. In this case, the plurality of panel holding portions 22 are arranged at intervals in the Y direction.

  As described above, in the modification, the beam 2A includes the panel holding portion 22 protruding from the upper plate 202A. The panel holding portion 22 includes a base portion 221 extending in a direction intersecting the upper plate 202A, a lid portion 222 extending from the base portion 221 in a direction perpendicular to the longitudinal direction of the beam 2A (X direction), Is provided. The distance L222 from the lid 222 of one beam 2A of the two beams 2A supporting one panel 4 to the lid 222 of the other beam 2A is a direction perpendicular to the longitudinal direction of the beam 2A ( It is smaller than the length L4 of the panel 4 in the X direction).

  Accordingly, the panel 4 does not come out from between the lid portion 222 and the upper plate 202A while the panel 4 is being slid and while the panel 4 is being fixed. Therefore, in a modification, it is suppressed that the panel 4 falls at the time of construction of the panel 4. FIG.

DESCRIPTION OF SYMBOLS 1 Fall prevention apparatus 10 Base plate 101,102 Road shoulder 11,12 Elevated road 19 Fastening member 2a, 2b, 2A Beam 21 Groove 21a Narrow part 21b Wide part 201, 201A Vertical board 202, 202A Upper board 203, 203A Lower board 22 Panel holding Portion 221 Base 222 Lid 25, 251, 252 First long hole 26 Hole 3 Nut holder 30 Projection 31 Recess 32 Long hole 33 Nut 36 Hole 39 Fastening member 4 Panel 41, 42 Notch 45 Second long hole 71 First Cover 711 Long hole 719 Fastening member 72 Second cover 721 Long hole 729 Fastening member

Claims (5)

A beam spanned between two elevated roads,
A panel fixed to the beam with a fastening member and a nut meshing with the fastening member;
With
The beam includes a groove provided in an upper plate in contact with the panel, and a nut holder fitted in the groove,
The said nut holder is provided in the surface near the said panel, and is provided with the recessed part which accommodates the said nut. Fall prevention apparatus. The beam comprises a first slot extending in a first direction parallel to the longitudinal direction of the beam,
The longitudinal direction of the recess is along the first direction,
The fall prevention device according to claim 1, wherein the panel includes a second elongated hole extending in a second direction perpendicular to the first direction. One end of the beam is fixed to one of the two elevated roads,
The fall prevention device according to claim 1 or 2, wherein the other end of the beam is not fixed to the other of the two elevated roads. The beam includes a panel holding portion protruding from the upper plate,
The panel holding portion includes a base portion extending in a direction intersecting the upper plate, and a lid portion extending from the base portion in a direction perpendicular to the longitudinal direction of the beam,
The distance from the lid portion of one of the two beams supporting the panel to the lid portion of the other beam is the direction in the direction perpendicular to the longitudinal direction of the beam. The fall prevention device according to any one of claims 1 to 3, wherein the fall prevention device is smaller than a length of the panel. A beam spanned between two elevated roads,
A panel fixed to the beam;
With
One end of the beam is fixed to one of the two elevated roads,
The other end of the beam is not fixed to the other of the two elevated roads.

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