JP3853780B2 - Parent rope support - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a master rope column for placing a master 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 high-level work of a building under construction. More specifically, the present invention relates to a master rope support used by being fixed to a flange portion of a steel beam.

  Conventionally, as a master rope support attached to the flange portion of a steel beam, a vertical support pillar, a fixing bracket provided at the lower end of the support pillar, and a master rope attached to the upper end of the support pillar The thing which has a metal fitting is common, and the support | pillar main body was erected on the steel beam by holding and fixing to the upper flange of the H-shaped steel used as a steel beam with a fixing metal fitting. At least two master ropes are attached to one steel beam, and the master rope attached by each master rope attachment bracket is stretched between adjacent master ropes (for example, , See Patent Document 1).

  As a result, the worker hooks the hook provided at the tip of the safety belt attached to the waist on the master rope that connects the multiple master rope struts, so that the operator accidentally steps off the steel beam. Since the safety belt is retained by the master rope even if it falls from the top, there is no fear of falling from the steel beam to the ground, and it is possible to safely work at high places.

  However, from the viewpoint of workability, in the master rope support in which the vertical support pillar body is erected from the fixed metal fitting, the master rope holding metal fitting is at a position substantially equal to the waist height of the operator (90 cm or more from the work floor surface). Therefore, when the master rope support is attached to the steel beam, the master rope holding metal fitting is in the way.

  Therefore, in some cases, the master rope is attached to the fixing bracket with the upper end of the pole body tilted to the outside of the steel beam so that the master rope holding bracket protrudes to the outside of the steel beam. A strut has been proposed (see, for example, Patent Document 2).

Thereby, the master rope holding metal fitting is positioned outside the width of the steel beam, and the master metal holding metal fitting does not become an obstacle when the worker walks the steel beam.
Japanese Utility Model Publication No. 5-52119 (FIG. 1) Japanese Patent Laid-Open No. 11-30043 (FIG. 2)

  However, in the conventional master rope support as described above, when an operator falls from the steel beam, a large impact force in the vertical direction acts on the master rope, and a tensile force acts on the master rope. A force is generated that pulls the master rope holding metal fittings at the upper ends of the master rope support pillars arranged on the left and right with respect to the operator who has dropped the master rope. For this reason, a large bending stress acts on the lower end portion of the column main body, which is a joint portion between the fixing bracket and the column main body, and the column main body may be bent, or the fixing bracket may be broken and the parent rope column may fall off the steel beam. As a result, when the fixing bracket is damaged, and when the support body is bent even if the fixing bracket is not detached from the steel beam, the master rope hangs down near the steel beam or below the steel beam. The distance increases. For this reason, there has been a risk that a large impact force will be applied to the worker and that the worker may be hit against a steel beam or other structure, resulting in a major accident.

  Therefore, in order to solve the above-described conventional problems, the present invention provides a master rope support column in which the master rope does not drastically drop from the original position even when the operator falls from the steel beam. The challenge is to do.

In order to achieve the above object, the invention described in claim 1 includes a fixing member for fixing to a steel beam, a column body having a quadrangular cross section standing upward from the fixing member, and an upper end of the column body A parent rope holding member that hooks the parent rope attached to the section, and when the external rope acting on the parent rope holding member acts horizontally or obliquely downward by pulling the parent rope, A pair of side edges of the strut body that correspond to the stress concentrating portion in the master rope strut provided with a stress concentrating portion where stress generated when the strut body is bent is concentrated in the middle portion in the longitudinal direction of the strut body. Each has at least one set of concavo-convex portions, and is characterized in that a concave portion is formed on one of the other two sides where a compressive force acts.

In addition to the configuration of claim 1, the invention according to claim 2 has an inclined portion that is inclined in a direction away from the steel beam as it goes upward, and an upright portion at the tip of the inclined portion. The stress concentration portion is a concave portion provided inside a bent portion that connects the inclined portion and the upright portion.

According to a third aspect of the present invention, in addition to the configuration of the first aspect, the support member between the stress concentration portion and the fixing member is attached to a horizontal member that connects the support members to each other. It is characterized by being provided.

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

As described above, according to the first aspect of the present invention, the fixing member for fixing to the steel beam, the column main body having a square cross section standing upward from the fixing member, and the column main body A main rope holding member for hooking the main rope attached to the upper end, and when the external force acting to move the parent rope holding member horizontally or obliquely downward by pulling the parent rope, A pair of opposite sides of the strut body corresponding to the stress concentrating portion in a master rope strut provided with a stress concentration portion where stress generated when the strut body is bent is concentrated in an intermediate portion in the longitudinal direction of the strut body. Since each side has at least one set of concave and convex portions, the stress concentrates on the stress concentration portion, and the column above the stress concentration portion of the column main body with the stress concentration portion as the center. The outer surface of the main unit is Since it can be bent until it comes into contact with the outer surface of the column body below the concentrated part, the impact force caused by the operator's fall is absorbed by the energy required for bending at the stress concentrated part. The impact force exerted on the surface is small, so that a major accident can be avoided, and the uneven portion on the side where the compressive force is applied is crushed in the continuous direction of the uneven portion, and the uneven portion on the side where the tensile force is applied is continuous Since it will extend in the direction, it can directly absorb the bending moment centered on the uneven part that acts on the uneven part, so it can reproduce the bending on almost the same plane and impact between different products There is no variation in absorption capacity, and a master brace having always stable product characteristics is obtained. In addition, since the concave portion where the compressive force acts is formed on one of the other two sides, the operator can be applied even when an external force is applied that causes the column main body to tilt in any of the front, rear, left and right directions when viewed from the plane. Since the impact force exerted on the base can be weakened, a master brace that can be used in both the parallel type and the orthogonal type can be obtained.

According to the invention described in claim 2, the strut body has an inclined portion inclined in a direction away from the steel beam as going upward, and an upright portion at a tip of the inclined portion, and the stress concentration portion Is a concave portion provided inside the bent portion connecting the inclined portion and the upright portion, and can be bent until the upright portion abuts the inclined portion around the stress concentration portion. Since the impact force is absorbed by the energy required for bending at the stress concentration portion, the impact force applied to the worker is so small that a major accident can be avoided. Further, since the master rope holding member moves away from the side of the steel beam, the master rope holding member does not get in the way when an operator walks on the steel beam, and the stress concentration portion and the bent portion are separated from each other. Compared with the case where it is provided at a location, manufacturing costs can be reduced by simplifying the processing.

According to the invention described in claim 3, since the column main body between the stress concentration portion and the fixing member is provided with an attachment member to which a horizontal member connecting the column main bodies is attached. By attaching a horizontal member to the mounting member, it is possible to eliminate the gap through which humans can pass under the handrail, so that the worker will not fall from the steel beam, so it will be safer without relying on the master rope Can work.

According to the fourth aspect of the present invention, since the stress concentration portion is provided with a plurality of portions having different stress concentration directions, it is possible to flexibly cope with load loads with different directions applied to the column main body. Or a wide choice arises in the setting direction of a horizontal member. In addition, even if the load direction deviates somewhat from the planned design direction, the stress receiving direction is arranged in a plurality of directions, so that the stress is applied to a plurality of stress concentration portions compared to the case of one direction. It is possible to effectively disperse and respond flexibly, and it is possible to cope with the directions of all directions around the column main body.

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

  Embodiment 1 of the Invention

  First, the structure of the master rope support | pillar which concerns on Embodiment 1 of this invention is demonstrated.

  The first embodiment is an example of a so-called parallel-type main rope support that is arranged and fixed on the same side in the longitudinal direction of steel beams arranged in a straight line.

  FIG. 1 is a front view of a master rope column 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 the first embodiment is attached to the flange portion of the steel beam. FIG. 3 is an enlarged side view of a stress concentrating portion provided in the main body of the master rope column according to the first embodiment. 4 is an enlarged cross-sectional view of the stress concentration portion, and is a cross-sectional view taken along line AA of FIG. FIG. 5 is an enlarged cross-sectional view showing another aspect of the stress concentration portion.

  A square pipe having a square cross section is used for the column main body 2 of the parent rope column 1, and a scissors vise type fixing member 3 is joined to the lower end portion thereof by welding. The fixing member 3 has a substantially C-shaped gripping member 4 when viewed from the side. The gripping member 4 is screwed downward from above with a lower jaw portion 7 that contacts the lower surface of the flange portion 6 of the steel beam 5. And a supporting member 9 to which a fixing screw 8 that can be screwed is engaged.

  The substantially lower half of the column main 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 it goes upward, and a predetermined position which is an intermediate portion of the column main body 2 at the tip thereof. The upright portion 11 is in an upright posture. A bent portion 12, which is a boundary between the inclined portion 10 and the upright portion 11 of the column main body 2, forms a concave portion 13 that bites into a height that is approximately half of the cross section of the column main body 2. Here, when an external force for bending the column main body 2 in the horizontal direction is generated, it is sufficient if there is a stress concentration portion where stress generated when the column main body 2 is bent from the bent portion 12 is concentrated. The shape of is not limited to a semicircular shape when viewed from the side as shown in FIG. 2, but may be a V-shaped tip provided with a small bend R or other shapes. However, when the column main body 2 is bent, a part of the column main body 2 above the bent portion 12 (stress concentration portion) comes into contact with a part of the column main body 2 below the bent portion 12 (stress concentration portion). Thus, the parent rope holding member 17 must have a shape that can limit the lowering position of the parent rope holding member 17 so that the parent rope holding member 17 does not further drop.

  As shown in FIGS. 2 and 3, the depth is approximately 1 in the cross section of the column main body 2 on the pair of opposite sides orthogonal to the side of the column main body 2 in which the recess 13 is formed. A plurality of concavo-convex portions 14 that are digged up to a height of / 4 are continuously provided. Here, when an external force for bending the column main body 2 in the horizontal direction is generated, it is sufficient that there is a stress concentration portion where stress generated when the column main body 2 is bent from the bent portion 12 is concentrated. Instead of the plurality of concave and convex portions 14, a fan-shaped concave portion 15 having a fan shape when viewed from the side and deeper toward the center as shown in FIG. 4 and other shapes are employed. May be. However, when the column main body 2 is bent, a part of the column main body 2 above the bent portion 12 (stress concentration portion) comes into contact with a part of the column main body 2 below the bent portion 12 (stress concentration portion). Thus, the parent rope holding member 17 must have a shape that can limit the lowering position of the parent rope holding member 17 so that the parent rope holding member 17 does not further drop.

  The specific shapes and depths of the concave portion 13 and the concave and convex portion 14 can be variously changed depending on other design conditions such as the material of the column main body, the shape of the column main body, the load resistance, and the range in which the above object can be achieved. It may be determined as appropriate.

  A master rope holding member 17 to which the master rope 16 is hooked is attached to the upper end portion of the column main body 2. The master rope holding member 17 shown in the figure contacts the side surface of the column main body 2 by folding down the flat portion 18 that closes the opening at the upper end of the square pipe of the column main body 2 and both longitudinal ends of the flat portion 18 downward. A mounting bracket portion 20 having the mounting surface portions 19 and 19 is provided. At the central portion of the flat portion 18 of the mounting bracket portion 20, a master rope 16 having a shape in which two parallel support columns 21 and 21 extending vertically upward are integrally formed by a horizontally long oval shape can be hooked. And a latching portion 22. The latching portion 22 has a shape that can be manufactured by bending a single round bar. Although the two support columns 21 and 21 arranged in parallel are in contact with each other, the contact portion is integrated by welding or the like. Instead, only the base is welded and fixed to the flat portion 18. This is because when the operator falls from the steel beam 5 and the master rope 16 is pulled, an external force that moves the master rope holding member 17 horizontally or obliquely downward acts, It is considered that the shape of the latching portion 22 is easily deformed by being separated, and thereby the impact force applied to the operator can be reduced.

  When viewed from the front, gripping metal fittings 24 for gripping the handrails 23 are detachably attached to the attachment metal fittings 20 on the left and right outer sides of the latching portions 22 of the master rope holding member 17. In addition, an attachment member 26 to which a horizontal member 25 that connects the column main bodies 2 is attached is detachably attached to the column main body 2 between the recess 13 and the fixing member 3. In addition, since the handrail 23 and the horizontal member 25 are not necessarily required, the holding bracket 24 and the attachment member 26 are used as necessary.

  Since the master rope support 1 shown in the figure has a strong fixing member 3, it has a center of gravity at its lower end. For this reason, a handle 27 is provided on the inner side of the column main body 2 near the fixing member 3 in consideration of the balance in carrying.

  Next, the usage method of the master rope support | pillar which concerns on Embodiment 1 which has the structure demonstrated above is demonstrated.

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

  First, the lower jaw portion 7 of the gripping member 4 is directed to the lower surface of the flange portion 6 of the steel beam 5 and screwed so that the tips of the two fixing screws 8 and 8 are pressed against the upper surface of the flange portion 6 of the steel beam 5. Thus, the master rope support 1 is firmly fixed to the flange portion 6 of the steel beam 5. At this time, it is important to screw the two fixing screws 8 and 8 with equal force.

  Next, metal fittings 28 and 28 such as carabiners and hooks attached to the master rope 16 are hooked on the hook portions 22 and 22 of the master rope holding members 17 and 17 of the left and right master rope support columns 1 and 1. At this time, if necessary, a turnbuckle or other tensioner 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 master rope 16 is attached to the master rope holding members 17 and 17 of the two master rope supports 1, 1, the operator S holds the hook 30 provided at the tip of the safety belt attached to the waist. Hook on master 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 that is hung on the master rope 16 follows the walking, and the master rope 16 is moved. Will move.

  Therefore, if the operator S accidentally steps off the steel beam 5 and falls off the steel beam 5, the operator S is at the tip of the safety belt attached to the waist at any position of the master rope 16. Therefore, there is no fear of falling from the steel beam 5 to the ground. Therefore, the worker S can perform a high-place work on the steel beam 5 with peace of mind.

  Moreover, since the master rope support 1 according to the first embodiment has the above-described configuration and action, the impact force caused by the fall of the operator is obtained with the energy required for bending in the recess 13. Since it will be absorbed, the impact force applied to the worker will be so small. Moreover, since a part of the column main body 2 above the concave portion 13 of the column main body 2 abuts a part of the column main body 2 below the concave portion 13, the parent rope holding member 17 is not lowered further. In addition, since the worker's fall distance can be small, the impact force applied to the worker is even smaller. Therefore, according to the master rope support 1 according to the first embodiment, even if the operator falls from the steel beam, the master rope 16 does not drastically drop from the original position. Because the force can be kept small, a major accident can be avoided.

  [Embodiment 2 of the Invention]

  Next, the structure of the master rope support | pillar which concerns on Embodiment 2 of this invention is demonstrated.

  The second embodiment is an example of a so-called orthogonal master bracing strut that is arranged and fixed facing a position orthogonal to the longitudinal direction of a plurality of steel beams arranged in parallel.

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

  In the second embodiment, since the master rope 16 is stretched in a direction perpendicular to the longitudinal direction of the steel beam 5 to which the master rope support 1 is fixed, the steel frame to which the operator fixes the master rope support 1 is provided. Since the beam 5 cannot be walked, it is not necessary to consider walking with the steel beam 5 to which the master rope column 1 is fixed. Therefore, as in the first embodiment, the master rope holding member It is not necessary to attach the column body 1 to the fixing member 3 with the upper end portion of the column body 1 tilted to the outside of the steel beam 5 so that the position 17 projects to the outside of the steel beam 5. Therefore, in Embodiment 2, the column main body 2 is in a straight upright form. Further, when an external force that moves the main rope holding member 17 in the horizontal direction or obliquely downward is applied by pulling the main rope 16, the struts stand upright with the stress concentration portion where the stress generated when the main column body is bent is concentrated. The main body 2 is provided at an intermediate portion in the longitudinal direction. Here, as in the first embodiment, the stress concentration portion forms a recess 10 that has been cut into a height of approximately half of the cross section of the column main body 2. The recess 10 is provided on the same side as the lower jaw 7 of the holding member 4 and the fixing screw 8 of the fixing member 3.

  Next, the usage method of the master rope support | pillar which concerns on Embodiment 2 which has the structure demonstrated above is demonstrated.

  FIG. 8 is a side view showing a state in which one main strut column 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. .

  The same operation as that in the first embodiment is performed to firmly fix the two master rope supports 1, 1 to the outer flange portion 6 of each steel beam 5. At this time, the master rope support 1 is arranged so that the lower jaw portion 7 of the holding member 4 of the fixing member 3 faces each other. Next, metal fittings 27 and 27 such as carabiners and hooks attached to the master rope 16 are hooked on the hook portions 22 and 22 of the master rope holding members 17 and 17 of the left and right parent rope support columns 1 and 1. When the master rope 16 is attached to the master rope holding members 17 and 17 of the two master rope struts 1 and 1 as described above, the operator attaches the hook 29 provided at the tip of the safety belt attached to the waist. Hang on the 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. The hook 29 that is hung on is moved along the master rope 16.

  Therefore, when the worker steps off from the walking steel beam and falls from the steel beam, the worker provided the tip of the safety belt attached to the waist at any position of the master rope 16. Since it will be held by the master rope 16 from the hook 28, there is no fear of falling to the ground from the walking steel beam. In addition, when the master rope 16 is pulled downward due to the fall of the operator, an external force that moves horizontally or obliquely downward acts on the master rope holding member 17 on which the master rope 16 is hooked, and the upper end of the column main body 2 A force in the direction of pulling the parts toward each other works. At this time, since the concave portions 13 are provided on the opposing surfaces of the two column main bodies 2, 2, the compressive force acts on the concave portions 13, and the impact force of the operator's dropping is large. In such a case, with the recess 13 in the middle, the column main body 2 above the recess 13 of the column main body 2 is bent until it comes into contact with a part of the column main body 2 below the recess 13.

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

  In the first embodiment and the second embodiment, both the concave portion 13 and the concavo-convex portion 14 are provided in the same column main body 2 so that the master 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 master rope 1 for exclusive use of the orthogonal type or the parallel type that employs only one of the concave portion 13 and the concave and convex portion 14.

  Embodiment 3 of the Invention

  Next, the structure of the master rope support | pillar which concerns on Embodiment 3 of this invention is demonstrated.

  The third embodiment is an example of a so-called multidirectional master rope support. 9 and 10 show an example in which a pair of (two) stress concentrating portions are provided with respect to a column having a quadrangular cross section, each of which has two directions in which a fall is predicted, and each of which is oriented in a direction perpendicular to the column main body 2. Indicates. FIG. 9 is a front view of a master 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 quadrangular cross section is used, and it has a scissor-type fixing member 3, a gripping member 4, a lower jaw portion 7, and a fixing screw 8.

  The column main body 2 has an inclined portion 10 and an upright portion 11 as in the first embodiment. The bent portion 12, which is the boundary between the inclined portion 10 and the upright portion 11 of the column main body 2, is formed with concave portions 13 a and 13 b that bite in the line direction connecting the front surface and the back surface of the column main body 2 on the front surface and the back surface. It is. Thus, the direction of stress concentration is the direction of the line connecting the front surface and the back surface.

  Also, the surface on which the recesses 13a and 13b are formed, that is, the unevenness that has bite into the side surface of the column main body 2 orthogonal to the front and back surfaces of the column main body 2 to approximately 1/4 of the cross section of the column main body 2 A plurality of portions 14 are provided continuously in the vertical direction. As a result, the load stress in the direction connecting the front surface and the back surface can be more flexibly concentrated in the recesses 13a and 13b.

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

  A concave portion 15a is further provided on the side surface of the column main body 2 which is measured from the lowermost end of the column main body 2 and hits substantially the same position height as the concave portions 13a and 13b. That is, recesses 13a and 13b and a recess 15a are provided on the front, side, and back of the column main body 2 at the same position height in the waistline direction. The concave portion 15a has substantially the same depth and size as the concave portions 13a and 13b, and a wave-shaped uneven portion in which the wavelength direction is arranged in the vertical direction is formed at the bottom of the recess. As a result, the direction of stress concentration is the direction of the line connecting both side surfaces. The stress in the line direction connecting both side surfaces of the column main body 2 can be flexibly concentrated in the recess 15a.

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

  As shown in FIG. 6, the third embodiment is basically intended to be used when two master struts are arranged on the same side in the longitudinal direction of the steel beams arranged in a straight line. However, as shown in FIG. 8, it is perpendicular to the longitudinal direction of the steel beams arranged in parallel or facing each other at an obtuse angle and an acute angle that cannot be said to be orthogonal, on the outer side of each steel beam. It can also be used for the use of fixing the master rope support one by one. The master rope support according to the third embodiment is scheduled to be loaded in a direction perpendicular to the front face of the support, but the load direction can flexibly cope with even a large deviation in angle from the planned direction.

  [Embodiment 4 of the Invention]

  Next, the structure of the master rope support | pillar which concerns on Embodiment 4 of this invention is demonstrated.

  The fourth embodiment is an example of a so-called multidirectional master rope support. FIG. 11 and FIG. 12 show an example in which a stress concentrating portion is provided with respect to a column having a square cross section, in which the direction in which the fallen image is predicted is two directions and each is directed in the direction perpendicular to the column main body 2. The stress concentration portion is disposed at a position corresponding to a different height as measured from the lowermost end of the column main body 2. FIG. 11 is a front view of a master 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 quadrangular cross section is used, and it has a scissor-type fixing member 3, a gripping member 4, a lower jaw portion 7, and a fixing screw 8.

  The column main 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 column main body 2, and a concave portion 13 c that is recessed in the concave direction of the bent portion 12 is formed on the front surface of the bent portion 12. That is, the concave portion 13 c is deepened in the line direction connecting the front surface and the back surface of the column main body 2. Thus, the direction of stress concentration is the direction of the line connecting the front surface and the back surface.

  Further, on both side surfaces orthogonal to the front surface of the column main body 2, irregularities 14 c are formed in the vicinity of the same position height as the concave portion 13 c, so that it can be more easily bent in the depth direction of the concave portion 13 c.

  On one side surface of the column main body 2, a second indentation 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. As a result, the direction of stress concentration is a line direction connecting both side surfaces. The back surface of the column main body 2 is further provided with unevenness 14d at the same height as the concave portion 13d so as to be more easily bent in response to the stress in the line direction connecting both side surfaces so that impact energy can be absorbed flexibly.

  As with the third embodiment, the fourth embodiment is sufficiently compatible with the use in which one main strut support is fixed to the outer side of each steel beam so as to face each other at an angle that is not orthogonal. it can. Although the master rope support post is scheduled to be loaded in a direction perpendicular to the support post surface, it can be flexibly handled even if the load direction deviates considerably in angle. In other words, it can handle loads in almost all directions.

  In the fourth embodiment, unlike the third embodiment, a reinforcing member 7 a that supports the lower jaw 7 is externally provided on the outer side of the lower jaw 7. Manufacture was easy, and the strength was slightly higher than that provided inside the lower jaw 7.

It is a front view of the master rope support | pillar which concerns on Embodiment 1 of this invention. It is the side view which showed the state which attached the master rope support | pillar which concerns on the Embodiment 1 to the flange part of the steel beam. It is the side view to which the stress concentration part provided in the support | pillar main body of the master rope support | pillar which concerns on the same Embodiment 1 was expanded. It is an expanded sectional view of a stress concentration part, Comprising: It is AA sectional drawing of FIG. It is the expanded sectional view which showed another aspect of the stress concentration part. It is a front view which shows the state by which two master rope support | pillars which concern on Embodiment 1 are arrange | positioned on the side of the same side of the longitudinal direction of the steel beam arrange | positioned in a straight line. It is the side view which showed the state which attached the master rope support | pillar which concerns on Embodiment 2 of this invention to the flange part of the steel beam. The side view which shows the state which fixed the master rope support | pillar which concerns on Embodiment 2 one by one on the outer side of each steel beam so that it may face in 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 master rope support | pillar which provided the stress concentration part in the same height in the multidirectional type | mold. It is a side view which shows an example of the master rope support | pillar which provided the stress concentration part in the same height in the multidirectional type | mold. It is a front view which shows an example of the master rope support | pillar which provided the stress concentration part in the multidirectional type | mold at the height which is different up and down. It is a side view which shows an example of the master rope support | pillar which provided the stress concentration part in the multidirectional type | mold in the height which is different up and down.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Master rope support | pillar 2 Support | pillar main body 3 Fixing member 4 Grasp member 5 Steel beam 6 Flange part 7 Mandibular part 8 Fixing screw 9 Support member 10 Inclination part 11 Upright part 12 Bending part 13 Concave part (stress concentration part)
14 Concavity and convexity (stress concentration part)
16 Parent rope 17 Parent rope holding member 20 Mounting bracket portion 22 Latching portion 23 Handrail 25 Horizontal member 26 Mounting member 30 Hook

Claims (4)

A fixing member for fixing to a flange portion of a steel beam , a support main body having a quadrangular cross section standing upward from the fixing member, and a main support holding a main support attached to the upper end of the support main body Stress concentration in which stress generated when the strut body is bent is concentrated when an external force that moves the parent rope holding member horizontally or obliquely downward is applied by pulling the parent rope. In the master rope supporting column provided in the middle part of the column main body in the longitudinal direction, a part of the column main body above the stress concentration portion abuts a part of the column main body below the stress concentration portion. Thus, the descending position of the master rope holding member is limited, and each of the pair of opposite sides of the column main body corresponding to the stress concentration portion has at least one set of uneven portions, and the other two Pressure on one side Shintsuna struts, wherein a recess force acts is formed. The column main body has an inclined portion that is inclined in a direction away from the steel beam as it goes upward, and an upright portion at a tip of the inclined portion, and the stress concentration portion is a bent portion that connects the inclined portion and the upright portion. The master rope support post according to claim 1, wherein the support brace is a recess provided on the inner side of the main rope. 3. The mounting body to which a horizontal member that connects the column bodies is attached to the column body between the stress concentration portion and the fixing member is provided. Parent rope support. The master rope support post according to any one of claims 1 to 3, wherein the stress concentration section includes a plurality of portions having different stress concentration directions.

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