JP2004353439A - Main rope strut - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a platform scaffold for a stairway capable of eliminating such complicated operations as disassembly and assembly, easily movable, and having high safety. <P>SOLUTION: This main rope strut comprises a top plate 1 and a leg part supporting the top plate 1 from the underside. The leg part comprises short leg parts 2 having different lengths and a long leg part 3. An extension fixing mechanism 35 is installed in the long leg part 3, and connection parts between the top plate 1 and the leg parts 2 and 3 are formed in foldable structures. The strut also comprises a rotating handrail 11, and the rotating handrail 11 comprises a handrail bar rotating shaft 23 at the rear part. In ascending, a worker ascends from the short leg part 2 side while opening the rotating handrail 11. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a main rope support for positioning a main rope for hooking a hook provided at the tip of a safety belt attached to a worker's waist at a predetermined position for the purpose of ensuring the safety of working at heights of a building under construction. More particularly, the present invention relates to a main rope support fixedly used on a flange portion of a steel beam.

  Conventionally, a main support pillar used by being attached to a flange portion of a steel beam includes a vertical support main body, a fixing metal provided at a lower end of the support main body, and a main support held at an upper end of the support main body. In general, a support pillar body is provided on a steel beam by gripping and fixing it to an upper flange of an H-shaped steel used as a steel beam with a fixing bracket. Then, at least two or more main rope supports are attached to one steel beam, and a main rope attached by each main rope mounting bracket is stretched between adjacent main rope supports (for example, for example). , Patent Document 1).

  By this, the worker hooks the hook provided at the tip of the safety belt attached to the waist to the main rope connecting the plurality of main rope supports, and the worker accidentally steps off the steel beam and removes the steel beam. Since the safety belt is retained by the parent rope even if it falls from the floor, there is no need to worry about falling from the steel beam to the ground, and it is possible to work at heights safely.

  However, from the viewpoint of workability, in the main rope support in which the vertical column main body is erected from the fixing metal, the main rope holding metal is located at a position substantially equal to the height of the worker's waist (90 cm or more from the work floor surface). Position), when the main rope support was attached to the steel beam, the main rope holding bracket was in the way.

  Therefore, in some cases, the main column is attached to the fixing bracket with the upper end of the column main body inclined to the outside of the steel beam so that the main column holding bracket is located at a position protruding outside the steel beam. A strut has been proposed (see, for example, Patent Document 2).

As a result, the main retainer is located outside the width of the steel beam, and the main retainer does not obstruct the worker when walking on the steel beam.
Japanese Utility Model Publication No. 5-52119 (FIG. 1) JP-A-11-30043 (FIG. 2)

  However, in the conventional main rope support as described above, when a worker falls from a steel beam, a large vertical impact force acts on the main rope, so that a pulling force acts on the main rope. A force is generated to pull together the parent rope holding metal fittings at the upper end portions of the parent rope posts arranged on the left and right with the worker on which the parent rope falls. For this reason, a large bending stress acts on the lower end portion of the pillar main body, which corresponds to a joint portion between the fixing bracket and the pillar main body, and there is a possibility that the pillar main body may be bent, or the fixing bracket may be damaged, and the main rope column may fall off the steel beam. As a result, not only when the fixing bracket is broken, but also when the support body is bent even if the fixing bracket does not come off from the steel beam, the master rope hangs down near the steel beam or below the steel beam, and the worker falls. The distance increases. For this reason, there is a possibility that a large impact force may be applied to the worker, and that the worker may be hit against a steel beam, another structure, or the like, resulting in a serious accident.

  In order to solve the above-mentioned conventional problems, the present invention provides a main rope support in which the main rope does not droop from the initial position even when an operator falls from the steel beam. The challenge is to do that.

  In order to achieve this object, an invention according to claim 1 includes a fixing member for fixing to a steel beam, a column main body standing upright from the fixing member, and an upper end portion of the column main body. A main rope support having a main rope holding member for hanging the main rope, wherein an external force that moves the main rope holding member horizontally or obliquely downward by pulling the main rope is applied, A stress concentration portion where a stress generated when the support body is bent is concentrated is provided at an intermediate portion in the longitudinal direction of the support body.

  The invention according to claim 2 is, in addition to the configuration according to claim 1, in a case where an external force acts on the master rope holding member and the support body is bent at the stress concentration portion, and the support body is bent above the stress concentration portion. A part of the support main body abuts a part of the support main body below the stress concentration portion, thereby limiting a lowering position of the master rope holding member.

  According to a third aspect of the present invention, in addition to the configuration of the first or second aspect, the support body has an inclined portion inclined in a direction away from the steel beam as going upward, and an upright portion at the tip of the inclined portion. Wherein the stress concentration portion is provided at a bent portion connecting the inclined portion and the upright portion.

  According to a fourth aspect of the present invention, in addition to any one of the first to third aspects, the stress concentration portion forms a concave portion on which a compressive force acts.

  According to a fifth aspect of the present invention, in addition to the configuration of any one of the first to third aspects, a cross-section of the support body is rectangular, and a pair of opposed support bodies corresponding to the stress concentration portion. Each of the side surfaces has at least one set of uneven portions.

  According to a sixth aspect of the present invention, in addition to the configuration according to any one of the first to third aspects, a cross-section of the support body is rectangular, and a pair of opposed support bodies corresponding to the stress concentration portion. Each side has at least one set of concave and convex portions, and one of the other two sides is formed with a concave portion to which a compressive force acts.

  According to a seventh aspect of the present invention, in addition to the configuration according to any one of the first to third aspects, the support body between the stress concentration portion and the fixing member has a horizontal structure connecting the support bodies. An attachment member to which a material is attached is provided.

  According to an eighth aspect of the present invention, in addition to any one of the first to seventh aspects, the stress concentration portion is provided with a plurality of portions in different stress concentration directions.

  According to a ninth aspect of the present invention, in addition to the configuration of the eighth aspect, the stress concentration portion is provided on the column main body in a vertical direction or around the column main body.

  As described above, according to the first aspect of the present invention, a fixing member for fixing to a steel beam, a column main body standing upright from the fixing member, and a fixing member attached to an upper end portion of the column main body. A main rope support having a main rope holding member for hanging the main rope, wherein when the main rope is pulled, an external force for moving the main rope holding member horizontally or obliquely downward acts. Since the stress concentration part where the stress generated when the main body is bent is concentrated is provided at the middle part in the longitudinal direction of the pillar main body, the stress will act intensively on the stress concentration part, and the stress concentration part will be centered. Since the outer surface of the support body above the stress concentration portion of the support body can bend until the outer surface of the support body below the stress concentration portion contacts the outer surface of the support body, the impact force caused by the fall of the worker can be reduced. Necessary for bending at Because will be absorbed by the energy, the impact force applied to the worker becomes a much smaller ones, it is possible to avoid a major accident.

  According to the invention described in claim 2, when an external force acts on the master rope holding member and the column body is bent at the stress concentration portion, a part of the column main body above the stress concentration portion is less than the stress concentration portion. By contacting a part of the lower support body, the lowering position of the main rope holding member is limited, so that the main rope holding member does not descend any more. Therefore, in addition to the effect of the first aspect, the impact force applied to the worker is further reduced.

  According to the invention described in claim 3, the support body has the inclined portion inclined in a direction away from the steel beam as going upward and the upright portion at the tip of the inclined portion, and the stress concentration portion is the inclined portion. In addition to the effect of claim 1, since the main rope holding member moves away from the side of the steel beam, the parent line holding member moves away from the side of the steel beam. The rope holding member does not become a hindrance, and the processing becomes simpler as compared with the case where the stress concentration portion and the bent portion are provided at different places, thereby reducing the manufacturing cost.

  According to the invention described in claim 4, since the stress concentration portion forms the concave portion on which the compressive force acts, the column main body bends toward the concave portion centering on the concave portion. The shock absorbing force and the position of the fall of the main rope holding member can be accurately estimated, and the design of the main rope support is facilitated.

  According to the invention described in claim 5, the cross section of the support body is rectangular, and the pair of opposed side surfaces of the support body corresponding to the stress concentration portion has at least one set of uneven portions. Therefore, the concave and convex portions on the side to which the compressive force is applied are crushed in the continuous direction of the concave and convex portions, and the concave and convex portions on the side to which the tensile force is applied extend in the continuous direction of the concave and convex portions. Can absorb bending moments centered on the uneven part acting on the part directly, so that the bending on almost the same plane can be reproduced, the dispersion of shock absorption power between different products is eliminated, and it is always stable The main rope support having the above-mentioned product characteristics is obtained.

  According to the invention described in claim 6, the cross section of the support body is rectangular, and the support body has at least one pair of concave and convex portions on a pair of opposed sides of the support body corresponding to the stress concentration portion, A concave portion is formed on one of the other two sides where a compressive force is applied. Since the applied impact force can be reduced, a main rope support that can be used in both the parallel type and the orthogonal type can be obtained.

  According to the invention described in claim 7, since the support member between the stress concentration portion and the fixing member is provided with the mounting member to which the horizontal member connecting the support body is attached, the mounting member is By attaching the horizontal member, it is possible to eliminate the gap where humans can pass under the handrail, so that the worker does not fall from the steel beam, so it is possible to work more safely without relying on the main line it can.

  According to the eighth and ninth aspects of the present invention, it is possible to flexibly cope with a load applied in different directions to the support body. There is a wide range of choices for the setting direction of the main line or the horizontal members. Even if the load direction is slightly angularly shifted from the design direction, the stress receiving direction is arranged in multiple directions, so the stress is more effectively applied to multiple stress concentration parts than in one direction Can be flexibly handled. That is, it is possible to cope with so-called omnidirectional directions around the column body.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  [First Embodiment of the Invention]

  First, the structure of the master rope support according to Embodiment 1 of the present invention will be described.

  Embodiment 1 is an example of a so-called parallel-type main rope support, which is arranged and fixed to a plurality of steel beams arranged in a straight line on the same side in the longitudinal direction.

  FIG. 1 is a front view of a master rope support according to Embodiment 1 of the present invention. FIG. 2 is a side view showing a state in which the master rope support according to Embodiment 1 is attached to a flange portion of a steel beam. FIG. 3 is an enlarged side view of the stress concentration portion provided on the main body of the main rope support according to the first embodiment. FIG. 4 is an enlarged cross-sectional view of the stress concentration portion, and is an AA cross-sectional view of FIG. FIG. 5 is an enlarged sectional view showing another aspect of the stress concentration portion.

  A square pipe having a quadrangular cross section is used for the column body 2 of the main rope column 1, and a crooked vice-type fixing member 3 is welded to the lower end thereof. The fixing member 3 has a gripping member 4 having a substantially C shape when viewed from the side, and the gripping member 4 is screwed downward from above and into a lower jaw 7 contacting the lower surface of the flange 6 of the steel beam 5. And a support member 9 to which a fixing screw 8 capable of being screwed is screwed.

  A substantially lower half of the column body 2 has an inclined portion 10 which is inclined in a direction away from the flange portion 6 of the steel beam 5 as going upward, and has a predetermined position which is an intermediate portion of the column body 2 at its tip. And has an upright portion 11 in an upright posture. The bent portion 12, which is the boundary between the inclined portion 10 and the upright portion 11 of the support body 2, forms a concave portion 13 that has been cut into a height approximately half of the cross section of the support body 2. Here, when an external force that bends the support body 2 in the horizontal direction is generated, a stress concentration portion where the stress generated when the support body 2 bends from the bent portion 12 may exist, and the concave portion 13 may be provided. Is not limited to a semi-circular shape as viewed from the side as shown in FIG. 2, but may be a V-shaped one having a small bend R at the tip or another shape. However, when the column body 2 is bent, a part of the column body 2 above the bent portion 12 (stress concentrated portion) abuts a part of the column body 2 below the bent portion 12 (stress concentrated portion). Accordingly, the shape of the main rope holding member 17 must be limited so that the lowering position of the main rope holding member 17 can be prevented so that the main rope holding member 17 does not further descend.

  As shown in FIGS. 2 and 3, a pair of opposed sides orthogonal to the sides of the column main body 2 in which the recesses 13 are formed have a depth of approximately 1 in the cross section of the column main body 2. A plurality of concave and convex portions 14 having a depth of / 4 are provided continuously. Here, when an external force for bending the support body 2 in the horizontal direction is generated, a stress concentration portion where the stress generated when the support body 2 bends from the bent portion 12 may be present, is sufficient. Instead of the plurality of concave / convex portions 14, a fan-shaped concave portion 15 having a fan shape as viewed from the side and having a depth increasing toward the center as shown in FIG. You may. However, when the column body 2 is bent, a part of the column body 2 above the bent portion 12 (stress concentrated portion) abuts a part of the column body 2 below the bent portion 12 (stress concentrated portion). Accordingly, the shape of the main rope holding member 17 must be limited so that the lowering position of the main rope holding member 17 can be prevented so that the main rope holding member 17 does not further descend.

  The specific shapes and depths of the concave portions 13 and the concave and convex portions 14 are variously changed depending on the material of the column main body, the shape of the column main body, withstand load, and other design conditions, and are in a range where the above object can be achieved. May be determined appropriately.

  A main rope holding member 17 to which the main rope 16 is hooked is attached to an upper end portion of the column body 2. The illustrated main rope holding member 17 folds a flat portion 18 that closes the opening at the upper end of the square pipe of the column main body 2 and both ends in the longitudinal direction of the flat portion 18 and contacts the side surface of the column main body 2. A mounting bracket portion 20 having the mounting surface portions 19, 19 is provided. At the center of the flat part 18 of the mounting bracket part 20, a main rope 16 having a horizontally elongated oval shape integrally formed with two parallel columns 21, 21 extending vertically upward can be hooked. And a hook portion 22. The hanging portion 22 has a shape that can be manufactured by bending a single round bar, and the two parallel columns 21 and 21 are in contact with each other, but the contact portion is integrally formed by welding or the like. Instead, only the base is fixed to the flat portion 18 by welding. This is because when the worker falls from the steel beam 5 and the master rope 16 is pulled, an external force that moves the master rope holding member 17 in the horizontal direction or diagonally downward acts on the two pillars 21 and 21. It is considered that the shape of the hooking portion 22 is likely to be deformed by being separated, so that the impact force applied to the worker can be reduced.

  When viewed from the front, gripping metal pieces 24 for gripping the handrails 23 are detachably attached to the mounting metal part 20 on the left and right outer sides of the hanging part 22 of the master rope holding member 17. Further, an attachment member 26 to which a horizontal member 25 connecting the pillar bodies 2 is attached is detachably attached to the pillar body 2 between the recess 13 and the fixing member 3. Since the handrail 23 and the horizontal member 25 are not necessarily required, the grip metal 24 and the mounting member 26 are used as necessary.

  The illustrated main rope support 1 has the center of gravity at the lower end thereof because the fixing member 3 is made strong. Therefore, the handle 27 is provided inside the column body 2 near the fixing member 3 in consideration of the balance at the time of carrying.

  Next, a method of using the main rope support according to the first embodiment having the above-described configuration will be described.

  FIG. 6 is a front view showing a state in which two main rope supports are arranged on the same side in the longitudinal direction of the steel beams arranged in a straight line.

  First, the lower jaw 7 of the gripping member 4 is addressed to the lower surface of the flange 6 of the steel beam 5, and the lower ends of the two fixing screws 8 are screwed into the upper surface of the flange 6 of the steel beam 5. As a result, the main rope support 1 is firmly fixed to the flange portion 6 of the steel beam 5. At this time, it is important to screw in the two fixing screws 8, 8 with an equal force.

  Next, metal fittings 28, 28 such as carabiners and hooks attached to the master rope 16 are hooked on the hook portions 22, 22 of the master rope holding members 17, 17 of the left and right master rope posts 1, 1. At this time, if necessary, a turnbuckle or another tensioning device 29 may be provided near one of the metal fittings 28 in order to eliminate the slack of the master rope 16. As described above, when the parent rope 16 is attached to the parent rope holding members 17 and 17 of the two parent rope posts 1 and 1, the worker S removes the hook 30 provided with the tip of the safety belt attached to the waist. Hook on parent rope 11. Then, since the hook 30 is movable with respect to the master rope 16, when the worker S walks on the steel beam 5, the hook 30 hung on the master rope 16 follows the walking and moves the master rope 16. Will move.

  Therefore, if the worker S accidentally steps off the steel beam 5 and falls off the steel beam 5, the worker S can move to the tip of the safety belt attached to the waist at any position of the master rope 16. Since the hook 30 provided with the bracket 30 is retained by the master rope 16, there is no risk of falling from the steel beam 5 to the ground. Therefore, the worker S can perform high-altitude work on the steel beam 5 with ease.

  In addition, the main rope support 1 according to the first embodiment has the above-described configuration and operation, so that the impact force caused by the fall of the worker is reduced by the energy required for bending in the recess 13. Because of the absorption, the impact force given to the worker becomes smaller. In addition, since a part of the support body 2 above the recess 13 of the support body 2 abuts on a part of the support body 2 below the recess 13, the main rope holding member 17 does not further descend. In addition, since the fall distance of the worker is small, the impact force applied to the worker is further reduced. Therefore, according to the master rope support 1 according to the first embodiment, even when the worker falls from the steel beam, the master rope 16 does not droop from the initial position, so that the impact given to the worker Since the force can be kept small, a major accident can be avoided.

  [Embodiment 2]

  Next, a configuration of a master rope support according to Embodiment 2 of the present invention will be described.

  Embodiment 2 is an example of a so-called orthogonal type main rope support, which is arranged and fixed facing a position orthogonal to the longitudinal direction of a plurality of parallelly arranged steel beams.

  FIG. 7 is a side view showing a state where the main rope support according to Embodiment 2 of the present invention is attached to a flange portion of a steel beam.

  In the second embodiment, the main rope 16 is stretched in a direction orthogonal to the longitudinal direction of the steel beam 5 to which the main rope support 1 is fixed. Since the beam 5 cannot be walked, it is not necessary to consider walking on the steel beam 5 to which the main rope support 1 is fixed. Therefore, as in the first embodiment, the main rope holding member is used. It is not necessary to attach the support body 1 to the fixing member 3 with the upper end portion of the support body 1 inclined to the outside of the steel beam 5 so that the position 17 projects to the outside of the steel beam 5. For this reason, in the second embodiment, the column main body 2 is in an upright state in a straight line. In addition, when the main rope 16 is pulled and an external force that moves the main rope holding member 17 in a horizontal direction or an obliquely downward direction is applied, the column where the stress generated when the column main body is bent is concentrated is a column that stands upright. The main body 2 is provided at an intermediate portion in the longitudinal direction. Here, as in the first embodiment, the stress concentrating portion forms a concave portion 10 that cuts into a height approximately half of the cross section of the column body 2. The recess 10 is provided on the same side as the lower jaw 7 of the holding member 4 of the fixing member 3 and the fixing screw 8 is provided.

  Next, a method of using the main rope support according to the second embodiment having the above-described configuration will be described.

  FIG. 8 is a side view showing a state in which one main support is fixed to the outer side of each steel beam so as to face each other at a position orthogonal to the longitudinal direction of the steel beams arranged in parallel. .

  By performing the same operation as in the first embodiment, the two main rope supports 1 and 1 are firmly fixed to the outer flange portions 6 of the respective steel beams 5. At this time, the main rope support 1 is disposed so that the lower jaw 7 of the gripping member 4 of the fixing member 3 faces the main rope support 1. Next, metal fittings 27, 27 such as carabiners and hooks attached to the master rope 16 are hooked on the hooking portions 22, 22 of the master rope holding members 17, 17 of the left and right master rope posts 1, 1. When the parent rope 16 is attached to the parent rope holding members 17, 17 of the two parent rope posts 1, 1 as described above, the worker attaches the hook 29 provided at the tip of the safety belt attached to the waist to the parent. Hook on rope 16. Then, since the hook 29 is movable with respect to the master rope 16, when the worker walks on another steel beam (not shown) orthogonal to the steel beam 5, the master rope 16 follows the walking. Will move along the parent rope 16.

  Therefore, when the worker steps off the steel beam during walking and falls from the steel beam, the worker is provided with the tip of the safety belt attached to the waist at any position of the master rope 16. Since the main rope 16 is retained by the hook 28, there is no risk of falling from the walking steel beam to the ground. Moreover, when the master rope 16 is pulled downward due to the fall of the worker, an external force that moves horizontally or diagonally downward acts on the master rope holding member 17 on which the master rope 16 is hung, and the upper end of the column body 2 The parts work toward each other. At this time, since the concave portions 13 are provided on the surfaces of the two pillar main bodies 2 facing each other, the compressive force acts intensively on the concave portions 13 and the impact force of the falling of the worker is large. In this case, with the concave portion 13 in the middle, the part of the column body 2 above the concave portion 13 of the column body 2 is bent until it comes into contact with a part of the column body 2 below the concave portion 13.

  Other configurations, operations, and effects are the same as those of the first embodiment, and the same configurations are denoted by the same reference numerals and description thereof is omitted.

  In the first and second embodiments, by providing both the concave portion 13 and the concave and convex portion 14 in the same column main body 2, the main rope column 1 can be used in both the orthogonal type and the parallel type. However, the present invention is not limited to this, and it is also possible to use the main rope support 1 exclusively for the orthogonal type or the parallel type employing only one of the concave portion 13 and the uneven portion 14.

  Third Embodiment of the Invention

  Next, a configuration of the master rope support according to Embodiment 3 of the present invention will be described.

  Embodiment 3 is an example of a so-called multi-directional main rope support. FIGS. 9 and 10 show an example in which a pair of (two) stress concentration portions are provided for a pillar having a rectangular cross section, in two directions in which the direction in which it is likely to fall is predicted, and each of the stress concentration portions facing the direction perpendicular to the pillar body 2. Is shown. FIG. 9 is a front view of a main rope support according to Embodiment 3 of the present invention. FIG. 10 is a side view thereof.

  As in the first embodiment, a square pipe having a square cross section is used, and has a vice-type fixing member 3, a gripping member 4, a lower jaw 7, and a fixing screw 8.

  The support body 2 has an inclined portion 10 and an upright portion 11 as in the first embodiment. The bent portion 12, which is a boundary between the inclined portion 10 and the upright portion 11, of the support body 2 forms recesses 13a, 13b in the direction of the line connecting the front and back surfaces of the support body 2, respectively, to the opposed front and back surfaces. It is. Thus, the direction of the stress concentration is the direction of the line connecting the front and the back.

  On the surface on which the concave portions 13a and 13b are formed, that is, on the side surface of the column main body 2 perpendicular to the front and back surfaces of the column main body 2, irregularities whose depth is cut into approximately 1/4 of the cross section of the column main body 2 are provided. A plurality of portions 14 are provided continuously above and below. Thus, the load stress in the direction connecting the front surface and the rear surface can be more flexibly concentrated on the concave portions 13a and 13b.

  The specific shapes and depths of the concave portions 13a and 13b and the concave and convex portions 14 are variously changed depending on the material of the column main body 2, the shape of the column main body, withstand load and other design conditions. What is necessary is just to determine suitably similarly to Embodiment 1 in the range which can be achieved.

  A concave portion 15a is further provided on a side surface of the column main body 2 which is located at substantially the same position and height as the concave portions 13a and 13b measured from the lowermost end of the column main body 2. That is, recesses 13a, 13b and a recess 15a are provided on the front, side, and back of the support body 2 at the same position and height in the waist direction. The concave portion 15a has substantially the same depth and size as the concave portions 13a and 13b, and a wave-shaped concave / convex portion in which the wavelength direction is vertically arranged at the bottom of the concave portion. Thereby, the direction of the stress concentration is set to the direction of the line connecting both side surfaces. The stress in the direction of the line joining both side surfaces of the column body 2 can be concentrated on the concave portion 15a flexibly.

  In other respects, similar to the first embodiment, a master rope holding member 17, a flat portion 18, mounting surface portions 19, 19, a support 21, a hook portion 22, and a handle 27 are provided.

  As shown in FIG. 6, the third embodiment is basically intended to be used when two main rope supports are arranged on the same side in the longitudinal direction of a linearly arranged steel beam. However, as shown in FIG. 8, as opposed to the longitudinal direction of the steel beams arranged in parallel, or at an obtuse angle that cannot be said to be orthogonal, and facing at an acute angle, the outer side of each steel beam is It can sufficiently cope with the use of fixing the main rope supports one by one. The master rope support according to the third embodiment is intended to apply a load in the direction perpendicular to the front of the support, but can flexibly cope with the load direction even if the load direction is significantly shifted in angle from the planned direction.

  [Embodiment 4]

  Next, the configuration of the master rope support according to Embodiment 4 of the present invention will be described.

  Embodiment 4 is an example of a so-called multi-directional master rope support. FIG. 11 and FIG. 12 show examples in which a stress concentration portion is provided for a pillar having a rectangular cross section in two directions in which a predicted falling image is formed, and each of the stress concentration portions faces in a direction perpendicular to the pillar body 2. The stress concentration portions are arranged at positions corresponding to different heights measured from the lowermost end of the column body 2. FIG. 11 is a front view of a main rope support according to Embodiment 4 of the present invention. FIG. 12 is a side view thereof.

  As in the first embodiment, a square pipe having a square cross section is used, and has a vice-type fixing member 3, a gripping member 4, a lower jaw 7, and a fixing screw 8.

  The support body 2 has an inclined portion 10 and an upright portion 11 as in the first embodiment. A bent portion 12 is provided at the boundary between the inclined portion 10 and the upright portion 11 of the support body 2, and a concave portion 13 c that is depressed in the concave direction of the bent portion 12 is formed in front of the bent portion 12. That is, the concave portion 13c has a depth penetrating in the direction of the line connecting the front surface and the rear surface of the support body 2. Thus, the direction of the stress concentration is the direction of the line connecting the front and the back.

  Also, on both side surfaces orthogonal to the front surface of the support body 2, irregularities 14c are formed near the same height as the concave portion 13c, so that the concave portion 13c can be more easily bent in the depth direction.

  On one side surface of the support body 2, a second recess 13d is provided at a position slightly higher than the recess 13c. The recess 13d is formed to have substantially the same depth and size as the recess 13c. Thereby, the direction of the stress concentration is set to the line direction connecting the both side surfaces. On the back surface of the pillar main body 2, an unevenness 14d is further provided at the same height as the recessed portion 13d so as to be more easily bent in response to a stress in a line direction connecting both side surfaces, so that impact energy can be flexibly absorbed.

  As in the third embodiment, the fourth embodiment is sufficiently compatible with the use in which one main support is fixed to the outer side of each steel beam at a non-perpendicular angle. it can. The main rope support is intended to be subjected to a load in a direction perpendicular to the support surface, but can flexibly cope with a considerable deviation in the load direction in angle. That is, it is possible to cope with loads in almost all directions.

  The fourth embodiment differs from the third embodiment in that a reinforcing member 7a for supporting the lower jaw 7 is provided outside the lower jaw 7. It was easy to manufacture, and the strength was slightly higher than when it was provided inside the lower jaw 7.

It is a front view of the main rope support | pillar which concerns on Embodiment 1 of this invention. FIG. 4 is a side view showing a state where the master rope support according to Embodiment 1 is attached to a flange portion of a steel beam. It is the side view which expanded the stress concentration part provided in the support | pillar main body of the main support | pillar support which concerns on Embodiment 1. FIG. FIG. 4 is an enlarged cross-sectional view of a stress concentration portion, and is a cross-sectional view along AA in FIG. 3. It is the expanded sectional view which showed another aspect of the stress concentration part. FIG. 3 is a front view showing a state where two main rope supports according to the first embodiment are arranged on the same side in the longitudinal direction of the steel beams arranged in a straight line. FIG. 10 is a side view showing a state where a master rope support according to Embodiment 2 of the present invention is attached to a flange portion of a steel beam. The side view which shows the state which fixed the main rope support | pillar which concerns on Embodiment 2 one by one to the outer side of each steel frame beam so that it may face each other at the position orthogonal to the longitudinal direction of the steel beam arranged in parallel. It is. It is a front view which shows an example of the main rope support | pillar which provided the stress concentration part at the same height in the multi-direction type | mold. It is a side view which shows an example of the main rope support | pillar which provided the stress concentration part in the same height in the multi-direction type | mold. It is a front view which shows an example of the main rope support | pillar in which the stress concentration part was provided in the upper and lower different heights in the multi-directional type. It is a side view which shows an example of the main rope support | pillar in which the stress concentration part was provided in the upper and lower different heights in the multidirectional type.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 Main rope support | pillar 2 Main | pillar main body 3 Fixing member 4 Grasping member 5 Steel beam 6 Flange part 7 Lower jaw part 8 Fixing screw 9 Support member 10 Inclined part 11 Upright part 12 Bent part 13 Concave part (stress concentration part)
14 Uneven part (stress concentration part)
16 Parent rope 17 Parent rope holding member 20 Mounting bracket part 22 Hanging part 23 Handrail 25 Horizontal member 26 Mounting member 30 Hook

Claims (9)

A main rope support having a fixing member for fixing to a steel beam, a column main body standing upright from the fixing member, and a main line holding member for hanging a main line attached to an upper end portion of the column main body. When an external force that moves the main rope holding member horizontally or obliquely downward is applied by pulling the main rope, a stress concentration portion where the stress generated when the support body is bent is concentrated. A main rope support provided at an intermediate portion in a longitudinal direction of the support main body. When an external force acts on the master rope holding member and the support body is bent at the stress concentration portion, a part of the support body above the stress concentration portion is a portion of the support body below the stress concentration portion. 2. The main rope support according to claim 1, wherein a lowering position of the main rope holding member is limited by contacting a part of the main rope. 3. The support body has an inclined portion inclined in a direction away from the steel beam as going upward and an upright portion at the tip of the inclined portion, and the stress concentration portion is a bent portion connecting the inclined portion and the upright portion. The main rope support according to claim 1, wherein the main rope support is provided on the support. The main rope support according to any one of claims 1 to 3, wherein the stress concentration portion forms a concave portion on which a compressive force acts. The cross section of the pillar main body is quadrangular, and at least one set of concave and convex portions is provided on each of a pair of opposed side surfaces of the pillar main body corresponding to the stress concentration portion. 3. The main rope support according to any one of the above-mentioned items. The cross section of the support body is rectangular, and the support body has at least one set of concave and convex portions on a pair of opposed sides corresponding to the stress concentration portion, and has one side of the other two sides. 4. The main rope support according to any one of claims 1 to 3, wherein a concave portion on which a compressive force acts is formed. 7. The support body between the stress concentration portion and the fixing member is provided with a mounting member to which a horizontal member connecting the support bodies is mounted. 8. The main rope support described in one. The main rope support according to any one of claims 1 to 7, wherein the stress concentration portion includes a plurality of portions provided in different stress concentration directions. 9. The main rope support according to claim 8, wherein the stress concentration portion is provided on the support body in a vertical direction or in a direction around the support body. 10.

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