JP2014205525A - Fall prevention structure of structural member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent falling of a structural member in which at least one end part is supported rotatably by a support part of a structure object, and to reduce impact load generated when preventing falling.SOLUTION: A falling prevention structure of the structural member includes the structural member whose one end is rotatably supported by an upper support part or a lower support part of the structure object while the other end is fixed to the lower support part or the upper support part, a falling prevention member which connects one end of the structural member to the upper support part or the lower support part, and prevents falling of the structural member by supporting the structural member when one end of the structural member comes off from the upper support part or the lower support part, and an impact absorbing member which connects one end of the structural member to the upper support part or the lower support part, and reduces impact load acting on the falling prevention member before the falling prevention member supports the structural member.

Description

  The present invention relates to a fall prevention structure for a structural member that prevents the fall of a structural member whose at least one end is movably supported by a support portion of the structure.

  The escalator is generally configured to include a truss structure member that is installed obliquely from the lower floor to the upper floor of the structure. The upper end or upper and lower ends of the truss structure member are movably supported by a support portion such as a frame beam in order to absorb shaking during an earthquake. For example, Patent Document 1 discloses an escalator truss in which an upper end of a truss body is supported by a building receiving beam.

  In addition, as a measure to prevent the escalator from falling when the upper end or upper and lower ends of the truss structure member move excessively due to a large earthquake, etc., it is considered that the upper end or upper and lower ends of the truss structure member and the support portion are connected by a wire rope. It has been.

  However, when the escalator, which is a heavy object, is supported by the wire rope, the load of the escalator is instantaneously concentrated on the wire rope, so that an impact load is generated on the truss structure member and the truss structure member is greatly shaken or damaged. It is necessary to take measures to prevent it.

JP-A-7-61752

  In consideration of such facts, the present invention prevents a structural member whose at least one end portion is movably supported by the support portion of the structure, and can reduce an impact load generated when the fall is prevented It is an object of the present invention to provide a fall prevention structure.

  The invention according to claim 1 is a structural member in which one end is movably supported by an upper support portion or a lower support portion of a structure, and the other end is fixed to the lower support portion or the upper support portion, and the structure One end of the member is connected to the upper support portion or the lower support portion, and when one end of the structural member falls off the upper support portion or the lower support portion, the structural member is supported to prevent the structural member from falling. An impact that reduces the impact load acting on the fall prevention member before the fall prevention member supports the structural member by connecting the one end of the structural member to the upper support portion or the lower support portion. And a structure for preventing the structural member from falling.

  In the first aspect of the invention, the structural member is supported by the fall prevention member, so that the structural member can be prevented from falling. Moreover, the impact load acting on the fall prevention member can be reduced by the impact absorbing member until the structural member is supported by the fall prevention member. As a result, it is possible to prevent the structural member from dropping and to reduce the impact load generated when the fall is prevented.

  According to a second aspect of the present invention, there is provided a structural member in which one end is movably supported by the upper support portion of the structure, and the other end is movably supported by the lower support portion of the structure, and one end of the structural member And a first fall prevention member that supports the structural member to prevent the structural member from falling when one end of the structural member falls off the upper support portion, and one end of the structural member. And a first impact absorbing member that reduces an impact load acting on the first fall prevention member before the first fall prevention member supports the structural member, and the other end of the structural member And a second fall prevention member that supports the structural member to prevent the structural member from falling when the other end of the structural member falls off the lower support portion, and The other end and the lower support part are connected, and the second fall prevention By member supporting the structural member is a fall prevention structure of a structural member having a second shock absorbing member for reducing the impact load acting on the second fall preventing member.

  In the invention according to claim 2, the structural member can be prevented from falling by being supported by the first and second fall prevention members. In addition, the impact load acting on the first and second fall prevention members can be reduced by the first and second impact absorbing members until the structural member is supported by the first and second fall prevention members. As a result, it is possible to prevent the structural member from dropping and to reduce the impact load generated when the fall is prevented.

  According to a third aspect of the present invention, in the structure member fall prevention structure according to the first or second aspect, the structural member is a truss of an escalator.

  In invention of Claim 3, while preventing the fall of an escalator, the impact load produced at the time of fall prevention can be reduced.

  Since the present invention has the above-described configuration, it is possible to prevent a structural member having at least one end portion movably supported by the support portion of the structure from being dropped, and to reduce an impact load generated when the fall is prevented.

It is a side view showing a truss concerning an embodiment of the present invention. It is a side view which shows the truss upper end vicinity vicinity which concerns on embodiment of this invention. It is a side view which shows the state which the truss upper end part which concerns on embodiment of this invention fell out from the frame upper beam. It is a side view which shows the impact-absorbing member which concerns on embodiment of this invention. It is a side view which shows the support method of the truss upper end part which concerns on embodiment of this invention. It is explanatory drawing which shows the model which calculates | requires the impact load which concerns on embodiment of this invention. It is explanatory drawing which shows the model which calculates | requires the impact load which concerns on embodiment of this invention.

  Embodiments of the present invention will be described with reference to the drawings. First, a structure for preventing a structural member from falling according to an embodiment of the present invention will be described.

  The side view of FIG. 1 shows a steel truss 10 as a structural member serving as a skeleton for supporting an escalator. For convenience of explanation, other than the truss 10 such as a handrail, a step, and various devices that the escalator has are omitted.

  The truss 10 is obliquely bridged from a frame upper beam 12 as an upper support portion made of H-shaped steel, which is provided in a building as a structure, to a frame lower beam 14 as a lower support portion made of H-shaped steel. ing. The frame upper beam 12 is provided on the ceiling of the building floor, and the frame lower beam 14 is provided on the floor of the building floor.

  A steel support member 18 whose side cross-sectional shape is L-shaped is fixed to the end surface of the upper end portion 16 of the truss 10, and the protruding portion 20 of the support member 18 is an upper surface of the upper flange 22 of the upper frame beam 12. Are slidably supported (movable laterally). A steel support member 26 having an L-shaped side cross-sectional shape is fixed to the end surface of the lower end 24 of the truss 10, and the protruding portion 28 of the support member 26 serves as an upper flange of the lower frame beam 14. 30 is fixed to the upper surface by welding or bolts. That is, one end (upper end portion 16) of the truss 10 is movably supported by the upper frame beam 12, and the other end (lower end portion 24) of the truss 10 is fixed to the lower frame beam 14.

  As shown in the side view of FIG. 2 in which the vicinity of the upper end 16 of the truss 10 is enlarged, the upper end 16 of the truss 10 and the upper beam 12 of the truss 10 are fall prevention members made of a steel wire rope having high rigidity and high strength. It is connected by the rope 32 as.

  The rope 32 has an upper end connected to a suspension piece 36 fixed to the lower surface of the lower flange 34 of the upper frame beam 12 via a shackle 38, and a suspension piece 40 fixed to the lower end surface of the upper end 16 of the truss 10. The lower end is connected through a shackle 42.

  Further, the upper end portion 16 of the truss 10 and the upper frame beam 12 are connected by a rope 44 as an impact absorbing member made of a nylon rope having low rigidity and impact force absorption.

  The rope 44 is connected at its upper end via a shackle 50 to a suspension piece 48 fixed at the corner where the upper flange 22 lower surface of the upper frame beam 12 and the side surface of the web 46 intersect, and the upper end 16 of the truss 10. A lower end portion is connected to a suspension piece 52 fixed to the upper end surface of this through a shackle 54.

  The ropes 32 and 44 are provided in a lightly tensioned state. Further, when the upper end 16 of the truss 10 falls off the upper beam 12 of the truss 10, the ropes 32 and 44 operate with the rope 44 ahead of the rope 32 (the tensile force generated by the vertical load of the truss 10 is reduced by the rope 32). The attachment position and length to the upper frame beam 12 and the truss 10 are set so that the rope 32 works after the rope 44 has been extended by a predetermined length.

  In the present embodiment, as shown in FIG. 2, when the upper end 16 of the truss 10 is dropped from the upper frame beam 12 (when the state shown in the side view of FIG. 3 is reached), the rope 44 has a length L1. The length of the rope 32 is the same as the length L2 before the upper end portion 16 of the truss 10 is dropped from the upper frame beam 12 in the state where the length D1 is extended to the length L3. That is, the tensile force generated by the vertical load of the truss 10 from the state in which the rope 44 is extended by the length D1 (the tensile force larger than the tensile force generated in the lightly stretched rope 32 in FIG. 2) is the rope 32. It starts to hang on.

  As a result, the rope 32 supports the truss 10 when the upper end portion 16 of the truss 10 is dropped from the frame upper beam 12 to prevent the truss 10 from falling, and the rope 44 is used until the rope 32 supports the truss 10. In addition, the impact load acting on the rope 32 from the truss 10 is absorbed and reduced.

  Next, the operation and effect of the structure for preventing fall of the structural member according to the embodiment of the present invention will be described.

  In the present embodiment, as shown in FIG. 3, the truss 10 can be prevented from falling by being supported by the rope 32 when the upper end portion 16 of the truss 10 is dropped from the upper frame beam 12. Further, the impact load acting on the rope 32 can be reduced by the rope 44 until the truss 10 is supported by the rope 32. Accordingly, it is possible to prevent the truss 10 from dropping and to reduce an impact load generated when the truss 10 is prevented from falling.

  That is, in the structure for preventing fall of the structural member according to the present embodiment, when the upper end portion 16 of the truss 10 falls off the frame upper beam 12 during an earthquake, the escalator is prevented from falling and the impact load generated on the escalator at the time of this fall prevention. Can be reduced. Therefore, when an escalator falls during an earthquake, it is possible to ensure the safety of a person who is under the escalator, and to prevent a person on the escalator from being shaken off by an impact. Furthermore, it is possible to prevent the escalator from collapsing due to the impact when the escalator falls during an earthquake, so that the person on the escalator falls or the debris hits the person.

  Moreover, the fall prevention structure of the structural member of this embodiment uses the ropes 32 and 44 which can use commercial items, such as a wire rope and a nylon rope, the upper end part 16 of the truss 10, and the frame upper beam 12 by a general method. Simply connect to, you can easily build. Furthermore, the structure member fall prevention structure of the present embodiment is substantially constituted by the ropes 32 and 44 and is not provided with devices such as dampers and actuators, so it is excellent in compactness and maintenance. It can be made unnecessary or maintenance work can be reduced.

  The embodiment of the present invention has been described above.

  In the present embodiment, as shown in FIG. 2, an example in which the fall prevention member is a rope 32 made of a steel wire rope has been shown. However, the fall prevention member has an upper end 16 of the truss 10 on the upper frame beam. It is sufficient that the truss 10 is supported when the truss 10 is dropped, and the truss 10 can be prevented from dropping. For example, the fall preventing member may be a fiber rope such as an aramid fiber rope. A plurality of fall prevention members may be provided.

  Further, in the present embodiment, as shown in FIG. 2, an example in which the impact absorbing member is a rope 44 made of a nylon rope is shown. However, the impact absorbing member is configured such that the upper end portion 16 of the truss 10 is detached from the frame upper beam 12. The impact absorbing member may be a long member having a shock absorbing property capable of absorbing and reducing the impact load acting on the fall preventing member. For example, the impact absorbing member may be a belt-like nylon sling.

  A plurality of impact absorbing members may be provided. For example, as shown in the side view of FIG. 4, two ropes 44 are provided, and one rope 44 (hereinafter referred to as “rope 44 </ b> A”) is connected from the upper end portion 16 (support member 18) of the truss 10 to the upper frame beam 12. The other rope 44 (hereinafter referred to as “rope 44B”) is disposed obliquely downward to the (web 46), and the upper beam 16 (support member 18) of the truss 10 to the upper frame beam 12 (web 46). You may arrange | position so that it may become diagonally upward.

  In this way, the rope 44A is pulled when the upper end 16 of the truss 10 is about to rise during an earthquake, and the upward force generated in the truss 10 is absorbed. Thereby, since the fall height of the truss 10 can be suppressed and the drop height can be lowered, the impact load due to the drop of the truss 10 can be reduced.

  The ropes 44A and 44B are arranged so that the rope 44A is inclined downward from the upper end portion 16 of the truss 10 to the upper frame beam 12, and the rope 44B is inclined upward from the upper end portion 16 of the truss 10 to the upper frame beam 12. Any arrangement may be used as long as it can be arranged. For example, the ropes 44A and 44B may be arranged so as to intersect each other.

  Furthermore, in the present embodiment, as shown in FIG. 2, an example in which a rope 32 as a fall prevention member and a rope 44 as an impact absorbing member are separately provided is shown. A single rope may be formed by weaving a “fall prevention rope” and a rope as an impact absorbing member (hereinafter referred to as an “impact absorbing rope”). For example, if a shock-absorbing rope is used as a core material and a fall prevention rope longer than this shock-absorbing rope is loosely wound to form a single-length composite rope, when the composite rope is pulled, first the shock-absorbing rope After the tensile force is mainly applied to the composite rope and the composite rope becomes a certain length, it is possible to apply the tensile force mainly to the fall prevention rope.

  Further, in the present embodiment, as shown in FIG. 2, an example in which a rope 32 as a fall prevention member and a rope 44 as an impact absorbing member are provided in a lightly stretched state is shown. If the rope 44 is provided so as to work, the ropes 32 and 44 may be provided in a stretched state, the ropes 32 and 44 may be provided in a relaxed state, or either of the ropes 32 and 44 may be provided. It may be provided in a state where one is stretched and the other is loosened. Preferably, the rope 44 is provided in a tensioned state and the rope 32 is loosened. In this way, it is possible to make it difficult for the upper end portion 16 of the truss 10 as a structural member to fall off the upper frame beam 12, and to gradually transmit the force generated from the truss 10 to the rope 32.

  Further, in the present embodiment, as shown in FIG. 1, an example in which the upper end portion 16 of the truss 10 is movably supported by the frame upper beam 12 and the lower end portion 24 of the truss 10 is fixed to the frame lower beam 14. Although shown, the lower end portion 24 of the truss 10 may be movably supported by the frame lower beam 14, and the upper end portion 16 of the truss 10 may be fixed to the frame upper beam 12.

  In this case, the lower end portion 24 of the truss 10 and the lower frame beam 14 are connected by the fall prevention member (rope 32), and the lower end portion 24 of the truss 10 and the lower frame beam 14 are connected by the shock absorbing member (rope 44). .

  Alternatively, the upper end 16 of the truss 10 may be movably supported on the frame upper beam 12, and the lower end 24 of the truss 10 may be movably supported on the frame lower beam 14.

  In this case, the upper end 16 of the truss 10 and the upper beam 12 are connected by the first fall prevention member (rope 32), and the upper end 16 of the truss 10 and the upper frame are connected by the first shock absorbing member (rope 44). The beam 12 is connected. Further, the lower end portion 24 of the truss 10 and the lower frame beam 14 are connected by the second fall prevention member (rope 32), and the lower end portion 24 of the truss 10 and the lower frame beam 14 are connected by the second shock absorbing member (rope 44). connect.

  Further, in the present embodiment, as shown in FIG. 2, ropes are attached to the upper end portion 16 of the truss 10 and the upper frame beam 12 using the suspension pieces 36, 40, 48, 52 and the shackles 38, 42, 50, 54. 32, 44 is shown as an example, but if the truss 10 can be supported by the rope 32 and the impact load acting on the rope 32 can be reduced by the rope 44, the upper end 16 of the truss 10 and the upper beam of the frame 12 may be connected to the ropes 32 and 44 by any method. For example, a round can metal fitting, an eyebolt, or the like may be provided on the upper end portion 16 of the truss 10 and the frame upper beam 12.

  Further, in the present embodiment, as shown in FIG. 2, the projecting portion 20 of the support member 18 is slidably supported on the upper surface of the upper flange 22 of the housing upper beam 12 (movable laterally). 12 shows an example in which the upper end portion 16 of the truss 10 is movably supported, but a spacer is provided between the lower surface of the projecting portion 20 of the support member 18 and the upper surface of the upper flange 22 of the upper frame beam 12. The installation height of the upper end portion 16 of the truss 10 may be adjusted.

  Further, for example, as shown in FIG. 5, plate members 56 and 58 may be slidably provided on the lower surface of the protruding portion 20 and the upper surface of the upper flange 22. For example, if the plate members 56 and 58 are made of a material such as stainless steel or Teflon (registered trademark) so as to reduce the friction coefficient of the sliding surface, the truss 10 can be supported in a seismic isolation manner for a long period, and the friction of the sliding surface If the plate members 56 and 58 are made of a material having a large coefficient, the roll of the truss 10 can be reduced by energy absorption and resistance due to friction.

  Further, for example, if a laminated rubber is provided between the lower surface of the protruding portion 20 and the plate material 56 or between the upper surface of the upper flange 22 and the plate material 58 so as to constitute a so-called sliding laminated rubber, the upper end portion 16 of the truss 10 is formed. The sliding allowance of the (projecting portion 20 of the support member 18) can be increased to make it difficult for the housing upper beam 12 (upper flange 22) to fall off.

  Furthermore, in this embodiment, as shown in FIG. 1, an example in which the structural member is an escalator truss was shown. However, the structural member fall prevention structure of the present embodiment is a housing provided in a structure such as a building. The present invention can be applied to various structural members such as skeletal members such as stairs and slopes, both ends of which are supported by support portions such as beams.

  Moreover, the fall prevention structure for structural members of the present embodiment can be applied to new and existing structural members (for example, elevator trusses, stairs, slopes, etc.). As described above, the structure member fall prevention structure according to the present embodiment is excellent in simplicity and compactness, and can eliminate or reduce maintenance work. Therefore, it can be applied to existing escalators by renovation work. In some cases, a more excellent effect can be exhibited.

<Example>

  Here, in the fall prevention structure of the structural member of the present embodiment shown in FIGS. 1 to 3, when the fall prevention member (rope 32) is a fiber rope and the impact absorbing member (rope 44) is a nylon rope, The effect of the invention (supporting the structural member by the fall preventing member and reducing the impact load acting on the fall preventing member by the impact absorbing member) will be described.

  As shown in the model diagram of FIG. 6, when a weight 60 having a weight W drops from a height h and collides with the upper surface of a rod 62 having a length L to shorten the rod 62 by a length λ, Assuming that the impact load acting on 62 is σ, the cross-sectional area of the rod 62 is A, and the longitudinal elastic modulus of the rod 62 is E, the potential energy given to the rod 62 by the weight 60 is equal to the elastic energy generated in the rod 62. The relationship of Formula (1) is established. Therefore, the equation (2) can be derived from the equation (1), and thereby the impact load σ can be obtained.

ここで、図６のモデル図は、図７のモデル図に置き換えることができるので、ロープ３２、４４に作用する衝撃荷重も式（２）から求めることができる。すなわち、長さＬのロープ３２、４４によって躯体上梁１２から吊り下げられた重さＷのトラス１０が、高さｈから落下し、ロープ３２、４４を長さλだけ伸ばした場合、トラス１０からロープ３２、４４に作用した衝撃荷重をσ、ロープ３２、４４の断面積をＡ、ロープ３２、４４の縦弾性係数をＥとすると、衝撃荷重σは、式（２）から求めることができる。

Here, since the model diagram of FIG. 6 can be replaced with the model diagram of FIG. 7, the impact load acting on the ropes 32 and 44 can also be obtained from the equation (2). That is, when the truss 10 having the weight W suspended from the upper beam 12 of the frame by the ropes 32 and 44 having the length L falls from the height h and extends the ropes 32 and 44 by the length λ, the truss 10 If the impact load acting on the ropes 32 and 44 is σ, the cross-sectional area of the ropes 32 and 44 is A, and the longitudinal elastic modulus of the ropes 32 and 44 is E, the impact load σ can be obtained from equation (2). .

  Table 1 shows the rope A when the upper end 16 of the truss 10 is dropped from the upper beam 12 of the truss 10 and dropped while the upper beam 16 of the truss 10 is connected by the rope A, B or C. , B, C margins are shown. The weight of the truss 10 is 8 tf, the height h at which the truss 10 is dropped is 107 mm, and the lengths L of the ropes A, B, and C are all 707 mm.

ロープＡは、縦弾性係数Ｅが４５０００Ｎ／ｍｍ^２、ロープ径が５０ｍｍ（有効断面積６２５ｍｍ^２／本）の２本の繊維ロープによって構成されている。式（２）より衝撃荷重σは１７４４ｋＮ／本となり、引張荷重Ｔは７４８ｋＮ／本となるので、余裕度Ｔ／σは０．４３となる。よって、ロープＡは、余裕度が１よりも小さいので、本実施形態の落下防止部材（ロープ３２）に適していないことがわかる。

The rope A is composed of two fiber ropes having a longitudinal elastic modulus E of 45000 N / mm ² and a rope diameter of 50 mm (effective cross-sectional area of 625 mm ² / piece). From equation (2), the impact load σ is 1744 kN / piece and the tensile load T is 748 kN / piece, so the margin T / σ is 0.43. Therefore, it can be understood that the rope A is not suitable for the fall prevention member (rope 32) of the present embodiment because the margin is smaller than 1.

The rope B is composed of two wire ropes having a longitudinal elastic modulus E of 98100 N / mm ² and a rope diameter of 50 mm (effective cross-sectional area of 625 mm ² / piece). From equation (2), the impact load σ is 2452 kN / piece and the tensile load T is 1740 kN / piece, so the margin T / σ is 0.71. Therefore, it can be seen that the rope B is not suitable for the fall prevention member (rope 32) of the present embodiment because the margin is smaller than 1.

The rope C is composed of two nylon ropes having a longitudinal elastic modulus E of 2000 N / mm ² and a rope diameter of 50 mm (effective cross-sectional area of 625 mm ² / piece). From equation (2), the impact load σ is 572 kN / piece and the tensile load T is 427 kN / piece, so the margin T / σ is 0.75. Therefore, it can be seen that the rope C is not suitable for the shock absorbing member (rope 44) of this embodiment because the margin is smaller than 1.

  Table 2 shows the ropes D and E when the rope D as the fall prevention member (rope 32) and the rope E as the shock absorbing member (rope 44) are provided together so as to be the configuration of the present embodiment. The margin is shown. That is, Table 2 shows the rope when the upper end 16 of the truss 10 is dropped from the upper beam 12 of the truss 10 and dropped while the upper beam 12 and the upper end 16 of the truss 10 are connected by the rope D and the rope E. The margins of D and E are shown. The weight of the truss 10 is 8 tf and the dropped height h of the truss 10 is 107 mm.

  Further, the length of the rope D is 707 mm and the length of the rope E is 316 mm so that the length when the truss 10 is subjected to an impact load is the same length L ′ (> 707 mm) in both the ropes D and E. It is said.

これにより、まず、トラス１０が落下してロープＥの長さが３１６ｍｍから７０７ｍｍになるまでは、ロープＤに荷重が掛からないので、ロープＥのみが伸びて衝撃荷重を吸収する。次に、ロープＥの長さがＬ’になるまでは、ロープＤ、Ｅがともに伸びて、ロープＥの伸びにより衝撃荷重が吸収される。次に、ロープＥの伸びが止まった以降は、ロープＤがトラス１０を支持する。

Thereby, until the truss 10 is dropped and the length of the rope E is changed from 316 mm to 707 mm, no load is applied to the rope D. Therefore, only the rope E is stretched to absorb the impact load. Next, until the length of the rope E reaches L ′, the ropes D and E are both stretched, and the impact load is absorbed by the elongation of the rope E. Next, after the elongation of the rope E stops, the rope D supports the truss 10.

The rope D is composed of two fiber ropes having a longitudinal elastic modulus E of 45000 N / mm ² and a rope diameter of 28 mm (effective cross-sectional area 196 mm ² / piece). From equation (2), the impact load σ is 219 kN / piece and the tensile load T is 269 kN / piece, so the margin T / σ is 1.23. Therefore, it can be seen that the rope D is suitable for the fall prevention member (rope 32) of this embodiment because the margin is larger than 1.

The rope E is composed of two nylon ropes having a longitudinal elastic modulus E of 2000 N / mm ² and a rope diameter of 40 mm (effective cross-sectional area of 400 mm ² / piece). From equation (2), the impact load σ is 86 kN / piece and the tensile load T is 167 kN / piece, so the margin T / σ is 1.94. Therefore, it can be seen that the rope E is suitable for the shock absorbing member (rope 44) of the present embodiment since the margin is larger than 1.

  Therefore, it can be seen from Table 2 that the rope D can support the truss 10 without breaking, and the rope E can absorb and reduce the impact load without breaking. Further, from Tables 1 and 2, since the impact load σ (= 219 kN / piece) of the rope D is smaller than the impact load σ (= 1744 kN / piece) of the rope A, the impact load acting on the rope D by the rope E is It can be seen that it has been absorbed and lowered.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to such embodiment at all, Of course, in the range which does not deviate from the summary of this invention, it can implement in a various aspect.

10 Truss (Structural member)
12 Frame upper beam (upper support part)
14 Lower beam (lower support)
16 Upper end (one end)
24 Lower end (other end)
32 Rope (fall prevention member)
44 Rope (shock absorbing member)

Claims (3)

A structural member whose one end is movably supported by the upper support portion or the lower support portion of the structure, and the other end is fixed to the lower support portion or the upper support portion;
One end of the structural member is connected to the upper support portion or the lower support portion, and when the one end of the structural member is dropped from the upper support portion or the lower support portion, the structural member is supported and dropped. A fall prevention member to prevent
An impact absorbing member that connects one end of the structural member and the upper support portion or the lower support portion, and reduces the impact load acting on the fall prevention member before the fall prevention member supports the structural member;
A structure for preventing a structural member from falling. A structural member whose one end is movably supported by the upper support portion of the structure, and whose other end is movably supported by the lower support portion of the structure;
A first fall-preventing member that connects the one end of the structural member and the upper support portion, and supports the structural member to prevent the structural member from falling when one end of the structural member falls off the upper support portion;
A first impact absorbing member that connects one end of the structural member and the upper support, and reduces an impact load acting on the first fall preventing member until the first fall preventing member supports the structural member;
A second fall prevention member that connects the other end of the structural member and the lower support portion, and supports the structural member to prevent the structural member from falling when the other end of the structural member falls off the lower support portion. When,
A second impact absorbing member that connects the other end of the structural member and the lower support portion, and reduces an impact load acting on the second fall preventing member until the second fall preventing member supports the structural member;
A structure for preventing a structural member from falling.   The structure member fall prevention structure according to claim 1 or 2, wherein the structural member is a truss of an escalator.

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