JP6341849B2 - Lifting safety fence - Google Patents

Description

  The present invention relates to an elevating safety fence that elevates an elevating member to open and close a passage.

  In recent years, so-called platform doors are becoming popular in railway stations. The platform door is a device installed on the platform of the railway station, which allows the passengers to enter and exit the train by opening the boarding passage while the train is stopped, and closing the boarding passage otherwise. This is a device that prevents a passenger from falling on a track. As one of the types of home doors, a pair of support columns that are arranged at intervals and fixed to the floor of the platform, elevating members supported by the support columns at both ends, and elevating members that are fixed to the support columns are moved up and down An elevating safety fence having a driving mechanism is known (for example, Patent Documents 1 and 2). The elevating safety fence can lower the elevating member to near the floor of the platform, block the passage set between the columns, and raise the elevating member to the head of the passenger to open the passage.

JP 2014-34309 A JP 2004-322823 A

  In general, the floor of the platform is composed of a plurality of concrete slabs. The concrete slab expands and contracts due to temperature changes such as day and night temperature changes and seasonal temperature changes. If the expansion and contraction of the concrete slab is structurally constrained, an excessive stress is generated inside the concrete slab and may be damaged. Therefore, on the floor surface of the platform, gaps (called expansion joints or simply expansions) are arranged between adjacent concrete slabs. That is, expansion and contraction are allowed in the range of expansion to avoid the generation of internal stress.

  When the expansion is arranged at the boundary of the concrete slab, the interval between the adjacent concrete slabs varies with the temperature change. That is, adjacent concrete slabs are displaced relatively. Therefore, when the conventional elevating safety fence is installed across the boundary of the concrete slab, the interval between the columns varies with the temperature change. If the interval between the support columns fluctuates, the elevating safety fence is distorted, so that abnormal noise may occur during operation or malfunction may occur.

  Therefore, conventionally, such a problem has been avoided by arranging an elevating safety fence avoiding the boundary of expansion. When installing an elevating safety fence when a platform is newly established, it is easy to solve the problem because the boundary of the concrete slab may be arranged according to the arrangement of the elevating safety fence. However, when an elevating safety fence is installed on an existing platform, the elevating safety fence may not be arranged depending on the position of the boundary of the concrete slab. In addition, it is not realistic from the viewpoint of cost to reconstruct the platform floor and change the position of the boundary of the concrete slab in order to install the elevating safety fence.

  This invention is made | formed based on such a background, and it aims at providing the raising / lowering safety fence which can be installed ranging over the boundary of the concrete slab which comprises a floor surface.

In order to solve the above-mentioned problem, a lifting safety fence according to the present invention is arranged with a space between them, a pair of pillars erected on the floor surface, and rod-like supports that are supported by the pillars so that both ends can be raised and lowered . a lifting member, the lifting safety fence comprising operates under compressive forces or tension loaded on the elevating member by the relative change in length of a pair of struts spacing and the lifting member, caused by variations And an adjustment mechanism for adjusting a difference between the distance between the pair of support columns and the length of the elevating member .

  According to the present invention, the elevating safety fence is provided with the adjusting mechanism for adjusting the difference caused by the relative variation in the distance between the pair of support columns and the length of the elevating member. An elevating safety fence can be installed across the border. Therefore, the elevating safety fence can be freely arranged on the existing floor surface.

It is an external view which shows the structure of the raising / lowering safety fence which concerns on 1st Embodiment of this invention. It is explanatory drawing which shows the structure of the expansion joint with which the raising / lowering type safety fence shown in FIG. 1 is equipped, (a) is a front view, (b) is a left view, (c) is a right view, (d) is a longitudinal section. Each side view is shown. It is a longitudinal cross-sectional view which shows the modification of an expansion joint, (a) shows the 1st modification, (b) shows the 2nd modification, respectively. It is an external view which shows the structure of the raising / lowering safety fence which concerns on 2nd Embodiment of this invention. It is an external view which shows the structure of the raising / lowering safety fence which concerns on 3rd Embodiment of this invention. It is explanatory drawing which shows the structure of the slide stand with which the raising / lowering safety fence shown in FIG. 5 is equipped, (a) is a top view, (b) is a side view, (c) is the AA 'line in (a). It is sectional drawing cut | disconnected by. It is a top view which shows the structure of the 1st modification of a slide stand. It is explanatory drawing which shows the structure of the 2nd modification of a slide stand, (a) is a top view of a slide stand, (b) shows the side view of a slide stand, (c) is a slide stand. The longitudinal cross-sectional view of the provided damper is shown, respectively.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of an elevating safety fence according to the present invention will be described in detail with reference to the drawings. In the drawings, the same or equivalent parts are denoted by the same reference numerals.

(First embodiment)
FIG. 1 is an outline view of an elevating safety fence 1 according to the first embodiment of the present invention. The elevating safety fence 1 is a so-called platform door installed on the platform of a railway station, and is installed on the floor 2 of the platform. The floor surface 2 includes a concrete slab 2a and a concrete slab 2b. Further, in order to absorb the expansion of the concrete slab 2a and the concrete slab 2b due to the temperature change, a gap 2c is disposed between the concrete slab 2a and the concrete slab 2b.

  Now, the elevating safety fence 1 is supported by a pair of support columns 3 fixed to the floor surface 2 and both ends of the support column 3 so as to be movable up and down by the support columns 3, and a door opening position (a position depicted by a solid line in FIG. 1) and a door closing position. It has the raising / lowering member 4 which raises / lowers between (position drawn with the broken line in FIG. 1). The support column 3 includes a first support column 3a and a second support column 3b. The first support column 3a is fixed to the concrete slab 2a, and the second support column 3b is fixed to the concrete slab 2b using anchor bolts (not shown). The elevating member 4 is configured by connecting a first member 4 a and a second member 4 b with an expansion joint 5. The expansion joint 5 is a joint that expands and contracts in the length direction (left and right direction in the drawing) of the elevating member 4, and the entire length of the elevating member 4 can be expanded and contracted by expanding and contracting the expansion joint 5. Therefore, for example, when the concrete slab 2a and the concrete slab 2b are relatively displaced due to a temperature change and the interval between the first support 3a and the second support 3b is changed, the first support 3a and the second support 3b are changed. The length of the elevating member 4 can be expanded and contracted in accordance with the interval between the columns 3b. In this way, the expansion joint 5 is a displacement correction that deforms the elevating member elongating mechanism or elevating safety fence 1 that elongates or elongates the length of the elevating member 4 according to the relative displacement between the concrete slab 2a and the concrete slab 2b. Acts as a mechanism. In the present embodiment, the first member 4 a and the second member 4 b correspond to a plurality of members constituting the elevating member 4. The detailed configuration of the expansion joint 5 will be described later.

  The support columns 3 (first support column 3 a and second support column 3 b) are structural members that support the elevating member 4 and the drive mechanism 6. Although the structure and structure of the support | pillar 3 are not specifically limited, Generally, it consists of the frame which supports the raising / lowering member 4 and the drive mechanism 6, and the cover which covers a flame | frame. In FIG. 1, the outline of the member corresponding to the cover of the column 3 is drawn with a broken line, and the shape of the member corresponding to the frame is not shown. Moreover, the frame equivalent member of the support | pillar 3 can be manufactured by processing a shape steel, for example.

  The drive mechanism 6 includes a rotary electric motor 7, a drive pulley 8, a driven pulley 9, and an endless belt 10. The rotary electric motor 7 is fixed to the column 3, and a drive pulley 8 is connected to an output shaft (not shown) of the rotary electric motor 7 to be rotated. The driven pulley 9 is pivotally supported by the support column 3, and an endless belt 10 is wound between the driven pulley 9 and the driving pulley 8. Since it is configured in this manner, the endless belt 10 moves between the driven pulley 9 and the driving pulley 8 when the rotary electric motor 7 is rotated.

  Both ends of the elevating member 4 (first member 4a, second member 4b) are fixed to an endless belt 10 installed in the first support column 3a and the second support column 3b, respectively. That is, the first member 4a is fixed to the endless belt 10 installed in the first support column 3a, and the second member 4b is fixed to the endless belt 10 installed in the second support column 3b. A means for fixing the elevating member 4 to the endless belt 10 is not particularly limited, but generally a clamp using a bolt and a nut is used as the fixing means. That is, the first clamp plate and the second clamp plate are sandwiched between the endless belt 10 and the first clamp plate and the second clamp plate are tightened with nuts and bolts, whereby the first clamp plate and the second clamp plate are A clamp of the type that binds the clamp plate to the endless belt 10 is used as the fixing means. In this case, either the first clamp plate or the second clamp plate is fixed to the elevating member 4.

  The rotary motor 7 is operated under the control of a control device (not shown). Further, the control device is configured to rotate the rotary motors 7 installed in the first support column 3a and the second support column 3b in opposite directions at the same rotational speed. For example, the rotary motor 7 installed in the first column 3a is rotated clockwise (in the direction of arrow 7a) in FIG. 1, and the rotary motor 7 installed in the second column 3b is counterclockwise (in the direction of arrow 7b). When rotating at the same rotational speed, the elevating member 4 descends while maintaining the level. If the rotary motor 7 is rotated in the opposite direction, that is, the rotary motor 7 installed on the first support column 3a is rotated counterclockwise, and the rotary motor 7 installed on the second support column 3b is rotated clockwise at the same rotational speed. The elevating member 4 is raised while keeping the level.

  The elevating member 4 is a rod-shaped member that is at the height of the abbreviated passenger (not shown), for example, at the closed position, and blocks the passage of the passenger. The material and structure of the elevating member 4 are not particularly limited. It may be a steel pipe or a light metal pipe, or may be a bar made of a noble metal material. Alternatively, it may be made of a woody material.

  As described above, the expansion joint 5 is a joint that expands and contracts in the longitudinal direction of the elevating member 4, and has the following structure. That is, as shown in FIG. 2 (a), the expansion joint 5 has a base 11 and a direction indicated by X in the drawing relative to the base 11 (the direction in which the first support 3a and the second support 3b are arranged, hereinafter referred to as “X axis”). It is composed of an advancing / retreating portion 12 that is attached so as to be freely reciprocated in a direction.

  As shown in a cross section in FIG. 2D, the base 11 is configured by fastening a base flange 11a, a cylinder 11b, and a cylinder head 11c with bolts (not shown). The base flange 11a is a metal flange that abuts against the end of the elevating member 4 (first member 4a) and is fixed to the end, as shown in FIG. Bolt holes 11d are formed. The cylinder 11b is a metal cylindrical member, and the left and right ends in FIG. 2D are closed by a base flange 11a and a cylinder head 11c. The cylinder head 11c is a metal member that closes the right end of the cylinder 11b, and has a shaft hole 11h through which a shaft 12b described later is inserted.

  As shown in FIG. 2D, the advance / retreat portion 12 is configured by fastening a piston 12a, a shaft 12b, and an advance / retreat portion flange 12c with bolts (not shown). The piston 12a is a disk that is slidably supported inside the cylinder 11b and advances and retreats inside the cylinder 11b. The piston 12a is provided with a through hole 12d for moving air before and after the piston 12a inside the cylinder 11b. The material of the piston 12a is not particularly limited. It may be metal or non-metal. The shaft 12b is a shaft connecting the piston 12a and the advance / retreat portion flange 12c, and is slidably supported in a shaft hole 11h formed in the cylinder head 11c. The advancing / retreating portion flange 12c is a metal flange that is fixed to the end portion of the elevating member 4 (second member 4b) and is fixed to the end portion as shown in FIG. Bolt holes 12e are drilled.

  Lubricating oil or grease is applied to the inner surface of the cylinder 11b and the shaft hole of the cylinder head 11c to form an oil film. By this oil film, friction when the piston 12a and the shaft 12b advance and retreat with respect to the base 11 is reduced.

  Since the expansion joint 5 is configured as described above, when the compressive force acts between the base flange 11a and the advance / retreat part flange 12c, the advance / retreat part 12 approaches the base 11. As a result, the expansion joint 5 contracts. When a tensile force acts between the base flange 11a and the advance / retreat part flange 12c, the advance / retreat part 12 is separated from the base 11. As a result, the expansion joint 5 extends.

  As described above, the expansion joint 5 is disposed between the first member 4a and the second member 4b, and both are connected to constitute the elevating member 4, so that the first support column 3a and the second support column 3b are connected to each other. The length of the elevating member 4 can be expanded and contracted according to the change in the interval. For this reason, even if the distance between the first support column 3a and the second support column 3b varies, the lifting member 4 is not greatly strained or stressed.

(Modification 1)
As described above, the expansion joint 5 only needs to include the base 11 and the advance / retreat part 12 attached to the base 11 so as to freely advance and retract. However, the expansion joint 5 may be configured by adding other members and the like. The expansion joint 5 may be configured, for example, as shown in FIG. That is, the coil spring 12f may be sandwiched between the base flange 11a and the piston 12a, and the coil spring 12g may be sandwiched between the piston 12a and the cylinder head 11c. Since the expansion joint 5 includes the coil spring 12f and the coil spring 12g, it functions as an elastic joint.

(Modification 2)
The expansion joint 5 may be configured to function as a viscous damper. For example, it may be configured as shown in FIG. That is, the space 11e inside the cylinder 11b may be filled with viscous oil, and the O-ring 11g may be disposed between the cylinder head 11c and the shaft 12b. In this way, when the piston 12a moves in the cylinder 11b, the viscosity of the viscous oil flowing through the through hole 12d acts as a resistance. Since the magnitude of the viscous resistance is proportional to the speed, the expansion joint 5 does not expand and contract because a large resistance is generated for a high-speed displacement. On the other hand, since the resistance generated against the low-speed displacement is small, the expansion joint 5 easily expands and contracts. Therefore, if the properties of the viscous oil and the dimensions of the through holes 12d are appropriately selected, the mechanical vibration does not follow, but the relative displacement between the concrete slab 2a and the concrete slab 2b accompanying the temperature change follows and expands and contracts. The expansion joint 5 can be obtained.

(Second Embodiment)
In the said 1st Embodiment, although the example which arrange | positions only one expansion joint 5 in the center of the span of the raising / lowering member 4 was shown, you may provide two or more expansion joints 5 and the arrangement | positioning of the expansion joint 5 is as follows. It is not limited to the center of the span. The elevating safety fence 1 may be configured, for example, as shown in FIG. That is, the elevating member 4 is divided into three members consisting of a central member 4c, a left end portion 4d, and a right end portion 4e, and a separate member is provided between the left end portion 4d and the central member 4c and between the central member 4c and the right end portion 4e. The expansion joint 5 may be disposed and connected to each other. Also in this case, the expansion joint 5 can use various types of joints including the first and second modifications.

(Third embodiment)
In the first and second embodiments, an example in which the elevating member 4 is divided into a plurality of members and the expansion joint 5 is arranged between the members and connected to each other, that is, according to the interval between the columns Although the example provided with the raising / lowering member expansion-contraction mechanism which expands / contracts the length of a member as an adjustment mechanism of this invention was shown, an adjustment mechanism is not limited to a raising / lowering member expansion-contraction mechanism. A strut interval expansion / contraction mechanism that expands / contracts the strut interval according to the length of the elevating member may be used as the adjustment mechanism. For example, as shown in FIG. 5, a sliding table 13 is disposed between one of the pair of columns 3 (here, the second column 3 b) and the floor surface 2 (concrete slab 2 b), and the column 3 The (second support column 3b) may be freely movable in the X-axis direction with respect to the floor surface 2 (concrete slab 2b).

  The slide base 13 is configured as shown in FIG. That is, as shown in FIGS. 6A to 6C, the slide base 13 includes a fixed portion 14 and a moving portion 15. The fixing portion 14 is a part that is placed on the floor surface 2 (concrete slab 2b) and fixed to the floor surface 2 (concrete slab 2b). The moving portion 15 is a portion that is slidably supported by the fixed portion 14 and is a portion on which the support column 3 (second support column 3b) is placed and fixed.

    As shown in FIGS. 6A and 6B, the fixing portion 14 includes a base plate 14a, a rail member 14b, and a stopper 14c. The base plate 14a is a metal flat plate fixed to the floor surface 2 (concrete slab 2b) with an anchor bolt (not shown). There are two rail members 14b, which are arranged at intervals in a direction indicated by Y in the figure (a direction orthogonal to the X axis, hereinafter referred to as "Y axis direction"), and are fixed to the base plate 14a with bolts (not shown). ing. A moving portion 15 is disposed between the two rail members 14b. The moving portion 15 is slidably supported on the rail member 14b and can move freely in the X-axis direction. The stopper 14 c is a metal member that is disposed at the end of the moving range (stroke) in the X-axis direction of the moving unit 15 and stops the movement of the moving unit 15. The sliding table 13 includes two stoppers 14c, and the two stoppers 14c are fixed to the base plate 14a with bolts (not shown).

  As shown in FIG. 6C, the moving portion 15 has a convex shape, and the rail members 14 b have an “inverted L shape” and are engaged with each other. For this reason, movement of the moving unit 15 in the X-axis direction with respect to the fixed unit 14 is allowed, and movement in the Y-axis direction is limited. In addition, between the moving part 15 and the fixed part 14, grease is filled for both lubrication and rust prevention. For this reason, when an external force in the X-axis direction is applied to the moving unit 15, the moving unit 15 easily moves in the direction of the external force.

  Since the elevating safety fence 1 is configured in this way, even if the concrete slab 2b is displaced relative to the concrete slab 2a due to a temperature change or the like, the moving part 15 of the sliding base 13 is a fixed part. Since the second support 3b moves relative to the concrete slab 2b by moving with respect to 14, the distance between the second support 3b and the first support 3a is expanded or contracted according to the length of the elevating member 4. As a result, the difference between the distance between the second column 3b and the first column 3a and the length of the elevating member 4 caused by the relative displacement between the concrete slab 2a and the concrete slab 2b is eliminated. Thus, the moving unit 15 functions as a strut interval expansion / contraction mechanism that expands / contracts the interval between the first strut 3a and the second strut 3b according to the length of the elevating member 4.

  In addition, even when the length of the elevating member 4 expands and contracts with respect to the distance between the second support column 3b and the first support column 3a due to the temperature change, the moving unit 15 adjusts the length of the elevating member 4 to the first. It functions as a support space expansion / contraction mechanism that expands and contracts the space between the support columns 3a and the second support columns 3b.

(Modification 1)
The configuration of the moving unit 15 is not limited to the above. For example, as shown in FIG. 7, if a rubber lump 14d is arranged between the moving part 15 of the slide base 13 and the stopper 14c, the impact when contacting the moving part 15 and the stopper 14c is alleviated. Can be prevented.

(Modification 2)
Alternatively, as shown in FIG. 8A, a damper 16 may be disposed between the moving portion 15 of the slide base 13 and the stopper 14c. As shown in FIG. 8B, the damper 16 has an outer cylinder 16a and a rod 16b that is attached to the outer cylinder 16a so as to be movable forward and backward. The outer cylinder 16a is fixed to the stopper 14c via a bracket 16c, and the rod 16b is fixed to the moving part 15 via a bracket 16d. Further, as shown in FIG. 8C, the damper 16 includes a piston 16f that is inserted and fitted into the outer cylinder 16a and moves forward and backward within the outer cylinder 16a. The piston 16f is connected to the rod 16b through a shaft 16e. The space inside the outer cylinder 16a is filled with viscous oil. When the piston 16f moves back and forth, the viscous oil moves from the right to the left or from the left to the right in the drawing through the through hole 16g formed in the piston 16f. At this time, the damping effect is generated by the viscous resistance that the through hole 16g receives from the viscous oil. Therefore, the moving unit 15 does not move due to displacement caused by mechanical vibration that occurs at a relatively high speed. For this reason, if the properties of the viscous oil and the size of the through-hole 16g are properly selected, it will not follow the mechanical vibration, but will move following the relative displacement of the concrete slab 2a and the concrete slab 2b accompanying the temperature change. A slide base 13 for moving the portion 15 is realized.

  As mentioned above, although each embodiment and modification of this invention were demonstrated, these illustrate the specific embodiment of this invention, and do not delimit the technical scope of this invention. The present invention can be freely modified, applied or improved within the scope of the technical idea described in the claims.

  For example, in each said embodiment, although the raising / lowering member 4 was illustrated as a specific example of a raising / lowering member, ie, one crosspiece was illustrated as a specific example of a raising / lowering member, an raising / lowering member is not limited to such a thing. The elevating member may be composed of a plurality of rungs, or may be constructed by combining the rungs and other members. For example, a crossbar and a flat plate may be combined, a vertical rail may be arranged between two crossbars arranged above and below to form a lattice, or a truss is configured by arranging diagonal beams between the crosspieces. Also good. Alternatively, a flat plate may be used as the elevating member.

  Moreover, in each said embodiment, although the example which comprises the raising / lowering member 4 and the expansion joint 5 by a separate part was shown, the raising / lowering member 4 and the expansion joint 5 may be comprised integrally, and it is a mutual component. You may make it share a part of. For example, in the elevating safety fence 1 shown in FIG. 1, the second member 4b is nested in the first member 4a, that is, the first member 4a and the second member 4b are combined like a telescope barrel. Thus, the expansion joint 5 may be configured by allowing it to move forward and backward. Alternatively, in the elevating safety fence 1 shown in FIG. 4, the elevating member 4 is formed at the left end 4d and the right end 4e with a socket into which the end of the central member 4c is inserted, and the central member 4c is connected to the socket. You may comprise so that it may advance / retreat freely.

  As a first modification of the expansion joint 5, an example in which the expansion joint 5 is provided with a coil spring 12 f and a coil spring 12 g in FIG. Although the example which equips the base 13 with the rubber lump 14d was shown, respectively, these are only illustrations of the spring element or the elastic member with which the expansion joint 5 or the sliding base 13 is provided. Instead of a coil spring or a rubber lump, other types of spring elements or elastic members may be provided.

  In addition, as a second modification of the expansion joint 5, the configuration of the expansion joint 5 that also functions as a viscous oil damper is illustrated in FIG. 3B, but the damper provided in the elevating safety fence according to the present invention is like this. It is not limited to anything. For example, a damper and an expansion joint with separate dampers may be arranged in parallel to form an expansion joint with a damper. The damper is not limited to a viscous oil damper. The same applies to the damper 16 shown in FIG. 8C as a second modification of the slide 13. The damper 16 is not limited to a viscous oil damper.

  In each of the above embodiments, the elevating safety fence 1 is a so-called platform door installed on the platform of a railway station, but the application target of the present invention is not limited to the platform door. For example, it may be used in the gates of commercial facilities and entertainment facilities.

  DESCRIPTION OF SYMBOLS 1 Lifting safety fence, 2 Floor surface, 2a Concrete slab, 2b Concrete slab, 2c Clearance, 3 support | pillar, 3a 1st support | pillar, 3b 2nd support | pillar, 4 Lifting member, 4a 1st member, 4b 2nd member, 4c Center 4d left end, 4e right end, 5 expansion joint, 6 drive mechanism, 7 rotary motor, 7a arrow (clockwise), 7b arrow (counterclockwise), 8 drive pulley, 9 driven pulley, 10 endless belt, 11 Base, 11a Base flange, 11b Cylinder, 11c Cylinder head, 11d Bolt hole, 11e Space, 11g O-ring, 11h Shaft hole, 12 Advancing and retracting part, 12a Piston, 12b Shaft, 12c Advancing and retracting flange, 12d Through hole, 12e Bolt hole , 12f coil spring, 12g coil spring, 13 slide base, 14 fixed part, 1 a base plate, 14b rail member, 14c stopper, 14d rubber mass 15 moving unit, 16 damper, 16a barrel, 16b rods, 16c bracket, 16d bracket, 16e shaft, 16f piston, 16g through hole

Claims (10)

A pair of struts spaced apart and erected on the floor;
A lifting safety fence and a lifting bar-shaped member which is supported vertically movably at both ends in the strut,
Operates under compressive forces or tension loaded on the elevating member by the relative change in length of the lifting member to the interval of the pair of struts, spacing of said pair of strut caused by the fluctuation And an elevating safety fence provided with an adjusting mechanism for adjusting a difference in length of the elevating member . The adjustment mechanism is
The elevating safety fence according to claim 1, wherein the elevating safety fence is an elevating member elongating mechanism that elongates and elongates the length of the elevating member according to the interval between the pair of support columns. A pair of struts spaced apart and erected on the floor;
A lifting member supported at both ends by the column so as to be movable up and down;
An elevating safety fence comprising: an adjustment mechanism that adjusts a difference caused by the variation when the distance between the pair of support columns and the length of the elevating member varies relatively;
The adjusting mechanism according to the length of the lifting member, Ru strut spacing extension mechanism der extending and retracting the interval between the pair of posts
Noboru Fushiki safety fence. The elevating member is divided into a plurality of members in the length direction,
The elevating safety fence according to claim 2, wherein the elevating member expansion / contraction mechanism is an expansion joint that connects the plurality of members to each other. The elevating member is composed of a first elevating member supported by one of the columns and a second elevating member supported by the other of the columns,
The elevating safety fence according to claim 4, wherein the first elevating member and the second elevating member are connected via the expansion joint. The elevating member includes a first end supported by one of the columns, a second end supported by the other of the columns, and an intermediate between the first end and the second end. And an intermediate member arranged in
The elevating safety fence according to claim 4, wherein the first end portion and the intermediate member, and the intermediate member and the second end portion are connected to each other via different expansion joints.   The elevating safety fence according to any one of claims 4 to 6, wherein the expansion joint is an elastic joint.   The elevating safety fence according to any one of claims 4 to 6, wherein the expansion joint includes a viscous damper. The strut spacing expansion and contraction mechanism is
The elevating safety fence according to claim 3, wherein the elevating safety fence is a sliding base fixed to the floor and movably supporting one of the columns with respect to the floor. The elevating safety fence according to claim 9, further comprising a viscous damper that connects the support supported by the slide base and the floor surface.

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