JP2022146473A - Temporary handrail mounting bracket - Google Patents

Abstract

To provide a mounting bracket that hardly interferes with work, facilitates the mounting work of a temporary handrail, and hardly scratches an object to be mounted.SOLUTION: A mounting bracket 1 is a bracket for mounting a temporary handrail 3 to a bridgeboard 95 at the construction site of a steel-framed staircase 91 under construction, which includes a bracket body 31 that holds the temporary handrail 3, a fixed clamping portion 38 that is provided on the bracket body 31 and arranged inside the steel-framed staircase, a clamping piece 37 that moves in the plate thickness direction of the bridgeboard 95 that is disposed outside the steel-framed staircase and is inserted between the fixed clamping portion 38 and the same and clamps the bridgeboard 95 between the fixed clamping portion 38 and the same, a bolt 41 arranged outside the steel-framed staircase and vertically screwed into the bracket body 31 with its head exposed upward, and a wedge piece 39 arranged outside the steel-framed staircase for converting axial movement of the bolt 41 into movement of the clamping piece 37.SELECTED DRAWING: Figure 3

Description

The present invention relates to a temporary handrail mounting bracket.

Conventional temporary handrail mounting brackets are described in Patent Documents 1 and 2 below. The mounting bracket of Patent Document 1 is for attaching a temporary handrail to the landing of a steel-framed staircase under construction. a bolt attached to a long piece located outside the steel staircase and having a head projecting toward the outside of the steel staircase. Then, the temporary handrail is attached to the sasara girder by tightening the bolts to fix the clamp fittings to the sasara girder.

The mounting bracket of Patent Document 2 is for attaching a temporary handrail of a temporary passage to the flange portion of the beam, and includes a U-shaped bracket that sandwiches the flange portion of the beam from above and below, and the upper surface of the flange portion and the U-shaped bracket. a wedge member inserted between the upper piece of the. As the bolt attached to the U-shaped metal fitting rotates, the wedge member moves in the in-plane direction of the upper surface of the flange, and the tapered surface provided on the upper piece of the U-shaped metal fitting moves the wedge member to the flange. It is pressed toward the upper surface of the part. As a result, the U-shaped fitting is fixed to the flange via the wedge member, and the temporary handrail is attached to the flange.

Japanese Utility Model Laid-Open No. 6-87554 Japanese Utility Model Laid-Open No. 6-73242

In the mounting bracket of Patent Literature 1, the bolt is positioned outside the steel-framed staircase and protrudes toward the outside of the steel-framed staircase. This has the advantage that the bolts do not interfere with the work inside the steel-framed stairs, but it is difficult to tighten the bolts from above the steel-framed stairs when installing the temporary handrail. In addition, with the mounting bracket of Patent Document 2, when the temporary handrail is attached, the wedge member is pressed against the upper surface of the flange portion while sliding on the upper surface of the flange portion in the in-plane direction. Conceivable. Scratches on the upper surface of the flange can also cause rust.

SUMMARY OF THE INVENTION In view of such problems, it is an object of the present invention to provide a mounting bracket that does not easily interfere with work, facilitates the work of mounting a temporary handrail, and does not easily scratch an object to be mounted.

In the temporary handrail mounting bracket of the present invention, a first region and a second region are partitioned by a predetermined plate-like portion which is a portion of a structure under construction and a temporary handrail attached to the plate-like portion. A temporary handrail mounting bracket for attaching a temporary handrail to a plate-like portion at a construction site of a structure, comprising a metal fitting body for holding the temporary handrail and a first clamp provided in the metal fitting body and arranged in a first region. and a plate-shaped portion provided in the metal fitting main body and arranged in the second region and inserted between the first holding portion in the thickness direction of the plate-shaped portion to move between the first holding portion and the plate-shaped portion and a second holding portion arranged in the second region, attached to the metal fitting body in a posture parallel to the extension direction of the temporary handrail from the metal fitting body, exposed in the extension direction from the metal fitting body, and operated by the user a movable shaft portion that has an operation receiving portion that receives an operation and is movable in its own axial direction according to an operation of the operation receiving portion; and a conversion mechanism for converting.

According to this temporary handrail mounting bracket, most of the parts of the mounting bracket, such as the second holding portion, the movable shaft portion, and the conversion mechanism, are arranged on the side of the second area, so that the attached mounting bracket It is less likely to interfere with work performed in one area. When installing the temporary handrail, since the movable shaft portion is arranged on the side of the second area, when the construction worker is in the first area, the construction worker can reach the second area to move the handrail. You will be manipulating the axis. However, since the operation receiving portion of the movable shaft portion is exposed in the extending direction of the temporary handrail from the metal fitting main body, the operation is relatively easy. In addition, since the second holding portion holds the plate-like portion while moving in the thickness direction of the plate-like portion, the surface of the plate-like portion is less likely to be scratched.

The movable shaft portion has a bolt that is screwed into the metal fitting main body and includes a head as an operation receiving portion, and the conversion mechanism includes a wedge surface that slides on the second holding portion and is self-aligned with the movable shaft portion. It is also possible to have a wedge member that pushes the second holding portion in the plate thickness direction via the wedge surface while moving in the axial direction.

The structure may be a steel-framed staircase, the plate-shaped portion may be a Sasara girder of the steel-framed staircase, the first area may be an area inside the steel-framed staircase, and the second area may be an area outside the steel-framed staircase. . Alternatively, the lower end of the portion on the side of the first region may be arranged at a position higher than the lower end of the portion on the side of the second region. According to this configuration, when concrete is placed inside the steel-framed staircase, the portion of the fitting located inside the steel-framed staircase is less likely to interfere with concrete-casting.

The metal fitting main body may have a holding portion that rotatably holds the post of the temporary handrail. According to this configuration, when the temporary handrails are attached to the left and right sides of the steel-framed staircase, it is possible to standardize the mounting method of the mounting bracket for the right temporary handrail and the mounting bracket for the left temporary handrail of the steel-framed staircase. can.

According to the present invention, it is possible to provide a mounting bracket that does not easily interfere with work, facilitates the work of mounting a temporary handrail, and does not easily scratch an object to be mounted.

It is a side view which shows an example of the attachment state of the temporary handrail using the attachment metal fittings of 1st Embodiment. It is a front view which expands and shows the vicinity of the mounting bracket in FIG. 1, seeing from the arrow II direction. (a) is a perspective view of a mounting bracket, (b) is a perspective view of a wedge piece, (c) is a perspective view of a holding piece, and (d) is a perspective view of the wedge piece viewed from another direction. . (a) and (b) are cross-sectional views of the mounting bracket for explaining the movement of the internal parts. FIG. 11 is a side view showing an example of a state in which a temporary handrail is attached using the mounting bracket of the second embodiment; It is a perspective view which shows the mounting bracket of 2nd Embodiment. It is a sectional view showing the fitting of a 2nd embodiment.

(First embodiment)
A first embodiment of a mounting bracket according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a side view showing an example of the mounting state of a temporary handrail 3 using the mounting bracket 1 of this embodiment. The temporary handrail 3 of this example is used in a steel frame staircase 91 under construction. This type of steel staircase is manufactured in a factory and brought to the site for installation. At this time, there are many cases where a handrail is not yet provided on the steel-framed staircase, and in this case, a temporary handrail is attached. The temporary handrail 3 of this embodiment is temporarily installed on a landing 93 of a steel-framed staircase 91 under construction. It is fixed at two points at the lower end through

The temporary handrail 3 includes a pair of support columns 11A and 11B extending vertically at both ends, an upper crosspiece 13 horizontally connecting the upper ends of the support columns 11A and 11B, and a horizontal connection between the lower ends of the support columns 11A and 11B. A lower crosspiece 15 is provided. Further, the temporary handrail 3 includes a middle rail portion 17 that horizontally connects the central portions of the support portions 11A and 11B, and an upper rail portion 13, a middle rail portion 17 and a lower rail portion at positions between the support portions 11A and 11B. and a central strut portion 19 that vertically connects the members 15 . Each of the support columns and crosspieces of the temporary handrail 3 is made of a round pipe material. In addition, the temporary handrail 3 is provided with a baseboard 21 covering the lower part of the temporary handrail 3. - 特許庁The baseboard 21 is provided in a belt shape over the entire length of the temporary handrail 3 at a position directly above the lower rail portion 15 with a vertical width of about one-tenth of the temporary handrail 3 .

The upper rail portion 13, the lower rail portion 15, and the middle rail portion 17 are each configured to be horizontally extendable. For example, the lower rail portion 15 has an outer cylindrical portion 15a positioned on the left side in the drawing and an inner cylindrical portion 15b positioned on the right side in the drawing and inserted inside the outer cylindrical portion 15a. can be stretched to The upper rail portion 13 and the middle rail portion 17 can also be expanded and contracted by the same structure. With this configuration, the temporary handrail 3 as a whole can expand and contract in the horizontal direction so that the pillars 11A and 11B at both ends are close to each other and separated from each other. The baseboard 21 is composed of an outer frame portion 21a positioned on the left side in the drawing and an inner plate portion 21b positioned on the right side in the drawing and inserted inside the outer frame portion 21a. The outer frame portion 21a is fixed via a bracket or the like to the strut portion 11A positioned on the left side in the drawing, and the inner plate portion 21b is fixed via a bracket or the like to the strut portion 11B positioned on the right side on the drawing. there is With this configuration, when the temporary handrail 3 expands and contracts, the baseboard 21 also expands and contracts, and the baseboard 21 always exists over the entire length of the temporary handrail 3 .

A thumbscrew 22 for tightening the outer cylinder part and the inner cylinder part is provided on the middle rail part 17, and the length of the temporary handrail 3 can be fixed by tightening the thumbscrew 22. - 特許庁Of the two mounting brackets 1 that hold the temporary handrail 3, one is fixed to the outer cylindrical portion 15a at a position near the support pillar 11A, and the other is fixed to the inner cylindrical portion 15b at a position near the support 11A. be. With this configuration, even if the length of the temporary handrail 3 fluctuates, the temporary handrail 3 is always held by the fittings 1, 1 at two locations near both ends in the length direction.

Next, the details of the mounting bracket 1 will be described. FIG. 2 is an enlarged front view showing the vicinity of the mounting bracket 1 in FIG. 1 as viewed in the direction of arrow II. The sasara girder 95 (plate-like portion) is a portion of the steel-framed staircase 91 under construction and has a flat plate-like shape in a vertical posture. A region A1 (first region) on the right side of the Sasara girder 95 in FIG. 91 is the area outside. At the construction site of the steel-framed stairs 91, the temporary handrail 3 is installed vertically so as to separate the area A1 from the external area A2 in order to prevent the construction workers who mainly come and go from the area A1 from erroneously deviating to the external area A2. placed in Below, area A1 is called "worker area A1" and area A2 is called "external area A2".

3(a) is a perspective view of the mounting bracket 1, FIGS. 3(b) to 3(d) are perspective views of internal parts of the mounting bracket 1, and FIGS. 4(a) and 4(b) are internal parts. 2 is a cross-sectional view of the mounting bracket 1 for explaining the movement of the . Hereinafter, when the terms "top/bottom" and "left/right" are used in the description of the mounting bracket 1, they correspond to the top, bottom, left, and right in FIG. When the term "vertical/horizontal" is used, it corresponds to the vertical/horizontal of the mounting bracket 1 attached to the sasara girder 95, as shown in FIG.

As shown in FIGS. 2 and 3(a), the mounting bracket 1 has a hollow box-shaped bracket body 31 without a bottom plate. The front plate 31a and the rear plate 31b of the metal fitting main body 31 have the same shape. Upper ends of the front plate 31a and the rear plate 31b protrude upward from the upper surface plate 31c of the metal fitting body 31, and handrail receiving grooves 33, 33 for placing the temporary handrail 3 are formed in the protruding upper edge portions, respectively. is provided. The handrail receiving groove 33 is formed by cutting out a semicircular portion of the front plate 31a and the rear plate 31b slightly to the right of the center thereof, into which the lower frame portion 15 of the temporary handrail 3 is fitted from above. It's like The lower crosspiece 15 of the temporary handrail 3 in the vertical position is fitted into and welded to the pair of handrail receiving grooves 33, 33, so that the temporary handrail 3 is held by the mounting bracket 1 in the vertical position. .

The upper surface plate 31c, the left side plate 31d, and the right side plate 31e are sandwiched between the front plate 31a and the rear plate 31b of the metal fitting body 31. As shown in FIG. The left edges of the front plate 31a and the rear plate 31b project slightly to the left from the left side plate 31d, and the right edges of the front plate 31a and the rear plate 31b project slightly to the left from the right side plate 31e. The front plate 31a, the rear plate 31b, the top plate 31c, the left side plate 31d and the right side plate 31e constitute a hollow box-like metal fitting body 31 surrounded by five sides and having no bottom plate.

The front plate 31a and the rear plate 31b are provided with girder insertion grooves 35 into which the sasara girder 95 is inserted. Into this girder insertion groove 35, a vertical Sasara girder 95 is inserted vertically from below when the mounting bracket 1 is installed. The girder insertion groove 35 is cut vertically upward from the lower edge of the front plate 31a and the rear plate 31b to a depth about half the vertical dimension of the front plate 31a and the rear plate 31b. . The lateral width of the girder insertion groove 35 is slightly larger than the plate thickness of the sasara girder 95 in order to insert the sasara girder 95 as described above. The girder insertion groove 35 is positioned slightly to the right of the center of the front plate 31 a and the rear plate 31 b and positioned substantially below the handrail receiving groove 33 . 2 and 4, the lower end of the portion of the mounting bracket 1 on the right side of the girder insertion groove 35 is the lower end of the portion on the left side of the girder insertion groove 35 (a horizontal guide plate 31h to be described later). lower end).

In the mounting bracket 1, as shown in FIGS. 4(a) and 4(b), the holding piece 37 (second holding portion) built in the hollow portion of the metal fitting main body 31 is positioned on the left side of the girder insertion groove 35. It can appear and disappear into the girder insertion groove 35 from the side. A mechanism for operating the holding piece 37 will be described later. The sasara girder 95 inserted into the girder insertion groove 35 is connected to the holding piece 37 moving rightward and the portion 38 (first holding portion) of the fitting body 31 located on the right side of the girder insertion groove 35. ) and is sandwiched between and fixed. Below, the part of the metal fitting main body 31 positioned on the right side of the girder insertion groove 35 is referred to as a "fixed holding part 38". The lower end of the fixed holding portion 38 is positioned higher than the lower end of the holding piece 37 when the mounting bracket 1 sandwiches the sasara girder 95 . In this manner, the mounting bracket 1 sandwiches the sasara girder 95 and the mounting bracket 1 is fixed to the sasara girder 95 . As a result, the temporary handrail 3 previously held by the mounting bracket 1 is attached to the sasara girder 95 in a vertical posture.

Next, a detailed configuration of the mounting bracket 1 for sandwiching the sasara girder 95 as described above will be described.

As shown in FIGS. 4(a) and 4(b), in the hollow portion of the metal fitting body 31, the holding piece 37 which can move left and right and a wedge which can move up and down for pushing the holding piece 37 are provided. A top 39 (wedge member) is incorporated. A bolt 41 (movable shaft portion) that engages with the wedge piece 39 is screwed to the top plate 31c of the metal fitting main body 31 . The nipping piece 37 and the wedge piece 39 have approximately the same depth dimension, and both of these dimensions are such that they can be just accommodated in the hollow portion of the metal fitting main body 31 .

The metal fixture main body 31 is provided with respective guide portions for guiding the movement of the holding piece 37 and the wedge piece 39 . For example, a horizontal guide plate 31h and a guide pin 31j are provided as guide portions for guiding the movement of the holding piece 37. As shown in FIG. The horizontal guide plate 31h is a steel plate positioned horizontally directly below the bottom surface of the holding piece 37, and spanned and welded between the front plate 31a and the rear plate 31b. The guide pin 31j is inserted through the elongated hole 37f of the holding piece 37 and extends in a direction perpendicular to the plane of FIG. The horizontal guide plate 31h and the guide pin 31j limit the movement of the holding piece 37 in the horizontal direction, and the stroke of this horizontal movement is restricted to the length of the long hole 37f or less.

Further, as a guide portion for guiding the movement of the wedge piece 39, for example, there is a vertical guide plate 31f provided so as to extend vertically downward from the lower surface of the upper surface plate 31c. Since the wedge piece 39 is sandwiched between the vertical guide plate 31f and the left side plate 31d, the movement of the wedge piece 39 is limited in the vertical direction. Since the bolt 41 is screwed into the top plate 31c, the movement of the bolt 41 is limited to rotation about the axis and movement in the axial direction accompanying the rotation.

The holding piece 37 has a trapezoidal shape with two horizontal sides when viewed from the line of sight in FIG. The holding piece 37 has a contact surface 37a positioned as a right end surface and in contact with the sasara girder 95, and an inclined surface 37b positioned as a left end surface and inclined approximately 45° with respect to the horizontal plane. The wedge piece 39 is a member having substantially the same depth dimension as the holding piece 37, and has a trapezoidal shape with two vertical sides when viewed from the line of sight in FIG. The wedge piece 39 has a wedge surface 39a at its lower portion which is inclined at approximately 45° with respect to the horizontal plane. With this configuration, the holding piece 37 and the wedge piece 39 are in surface contact with each other at the inclined surface 37b and the wedge surface 39a.

The holding piece 37 and the wedge piece 39 may be made of metal blocks having the above characteristics, but in the present embodiment, as shown in FIGS. 3(b) and 3(c), , a steel plate of a predetermined thickness is bent into a U-shape and another steel plate is welded to the required location. Therefore, the inclined surface 37b and the wedge surface 39a are actually surfaces having a width corresponding to the thickness of the steel plate. The contact surface 37a of the holding piece 37 that contacts the sasara girder 95 is a U-shaped surface having a width corresponding to the thickness of the steel plate.

Specifically, as shown in FIG. 3(c), the holding piece 37 includes a bottom plate 37c extending horizontally at the lower end, a pair of side plates 37d extending vertically upward from both edges of the bottom plate 37c, 37d and . An elongated hole 37f extending in the left-right direction is formed in the central portion of each side plate 37d, and the aforementioned guide pin 31j is inserted through each elongated hole 37f. As shown in FIGS. 3(b) and 3(d), the wedge piece 39 includes an upper plate 39c extending horizontally at the upper end and a pair of side plates extending vertically downward from both edges of the upper plate 39c. 39d, 39d. The upper plate 39c is formed with a U-groove 39h cut from the center of the left end face. Further, a horizontal bolt receiving plate 39e is welded to the substantially central portion of the wedge piece 39 in the vertical direction so as to bridge between the side plates 39d, 39d. A spherical bolt receiving recess 39f is formed on the upper surface of the bolt receiving plate 39e at a position directly below the U groove 39h.

As shown in FIG. 4, a through hole 43 having a diameter larger than the nominal diameter of the bolt 41 is formed in the upper plate 31c of the metal fitting main body 31, and a nut 45 is welded substantially coaxially with the through hole 43. ing. By screwing the bolt 41 into the nut 45, the bolt 41 is installed in the metal fitting main body 31 in a vertical posture. The tip side of the bolt 41 is inserted through the through hole 43 into the hollow portion of the metal fitting main body 31, and the head 41a (operation receiving portion) of the bolt 41 protrudes upward from the upper surface plate 31c. A portion of the shaft portion of the bolt 41 near the tip is formed with a small-diameter portion 41b having a small diameter by removing threads. The bolt 41 has a screw thread at a portion closer to the distal end than the small diameter portion 41b, and the distal end surface 41c of the bolt 41 is rounded into a spherical shape. The small-diameter portion 41b of the bolt 41 is engaged with the U-groove 39h of the wedge piece 39, and the portion closer to the tip than the small-diameter portion 41b is positioned between the upper plate 39c and the bolt receiving plate 39e.

The operation of the mounting bracket 1 based on the above configuration is as follows. When installing the mounting bracket 1, the sasara girder 95 is inserted into the girder insertion groove 35 of the mounting bracket 1, as shown in FIG. 4(a). Here, the upper end surface of the sasara girder 95 may abut against the upper edge surface of the girder insertion groove 35 . After that, the construction worker rotates the head 41a of the bolt 41 with an impact driver or the like. When the bolt 41 is displaced vertically downward due to the rotation of the bolt 41, the tip surface 41c of the bolt 41 fits into the bolt receiving recess 39f of the wedge piece 39 and pushes the bolt receiving plate 39e downward, causing the wedge piece 39 to move vertically downward. move to Then, while the wedge surface 39a of the wedge piece 39 slides on the inclined surface 37b of the holding piece 37, the holding piece 37 is pushed rightward by the wedge piece 39 and moves rightward. In this manner, the mechanism including the wedge piece 39 functions as a conversion mechanism that converts the vertical axial movement of the bolt 41 into rightward movement of the holding piece 37 .

Then, as shown in FIG. 4(b), by moving the holding piece 37 rightward, the contact surface 37a at the right end of the holding piece 37 moves against the sasara girder 95 in the thickness direction of the sasara girder 95. be pushed. Then, the sasara girder 95 is sandwiched and fixed between the holding piece 37 and the fixed holding portion 38 , and as a result, the mounting bracket 1 is fixed to the sasara girder 95 . Here, the contact surface 37 a of the holding piece 37 is pressed against the outer surface of the sasara girder 95 . The inner surface of the sasara girder 95 is pressed against the end face 38h of the front plate 31a and the end face 38k of the rear plate 31b corresponding to the right edge of the girder insertion groove 35. As shown in FIG. The temporary handrail 3 preliminarily welded to the handrail receiving groove 33 of the mounting bracket 1 is attached to the sasara girder 95 in a vertical posture through the mounting bracket 1 .

When the bolt 41 is reversely rotated and displaced vertically upward, the portion on the tip side of the bolt is caught in the U groove 39h of the wedge piece 39 due to the step with the small diameter portion 41b, and the wedge piece 39 is lifted upward along with the bolt 41. be done. As a result, the holding piece 37 is released from the wedge piece 39, and the holding piece 37 is allowed to move leftward. 1 can be removed from the sasara girder 95 .

Next, the effects of the mounting bracket 1 will be described.

As shown in FIGS. 2 and 4, when the mounting bracket 1 is installed, bulky mechanical parts including the holding piece 37, wedge piece 39, bolt 41, etc. are arranged in the external area A2, and are arranged in the operator area A1. It is the fixed clamp 38 which is relatively bulky. Construction workers come and go in the worker area A1, and many works are performed in the worker area A1. It hardly interferes with the traffic of the construction worker in A1, and hardly interferes with the work performed in the worker area A1.

For example, in the construction of a steel-framed staircase 91, as shown in FIG. 2, concrete C may be poured to a predetermined thickness on the floor 93a of the landing 93 or the tread surface of the staircase. Here, as described above, in the mounting bracket 1, the lower end of the fixed holding portion 38 is positioned higher than the lower end (lower end of the horizontal guide plate 31h) of the portion of the mounting bracket 1 located on the left side of the girder insertion groove 35. be. Therefore, there is little possibility that the height of concrete placement will reach the fixed holding portion 38, that is, the mounting bracket 1 is less likely to interfere with the concrete placement work. Therefore, during the concrete placing work, for example, it is possible to eliminate the need for measures such as temporarily removing the mounting bracket 1 or temporarily moving it upward, and the temporary handrail 3 can be temporarily removed. It is possible to avoid becoming an unstable installation state. In addition, the need for measures such as increasing the height of the sasara girder 95 to avoid interference between the mounting bracket and concrete is reduced.

The temporary handrail 3 separates the area (worker area A1) through which construction workers come and go from the outside (outside area A2). Pushing force works easily. Due to this force, a force (a force to rotate counterclockwise in FIG. 2) acts on the mounting bracket 1 to overturn it toward the outside area A2 side. Here, when the mounting bracket 1 is attached to the sasara girder 95, the lower end of the holding piece 37 on the side of the external area A2 is at a position lower than the lower end of the fixed holding portion 38 on the side of the worker area A1. With this configuration, the mounting bracket 1 can easily resist the overturning force. In addition, the fixed holding portion 38 and the holding piece 37 hold the sasara girder 95 by bringing the surfaces (contact surface 37a, end surface 38h, and end surface 38k) having a width in the vertical direction into surface contact with each other. It contributes to counteracting the overturning force of the

As a result of arranging the mechanism part in the external area A2 as described above, the bolt 41 to be operated by the construction worker in the installation work of the temporary handrail 3 is also located in the external area A2 (outside the landing 93, the temporary handrail 3 outside). Therefore, a construction worker in the worker area A1 needs to reach out to the outside area A2) and tighten the bolt 41. FIG. However, in the mounting bracket 1, the bolt 41 is attached to the bracket main body 31 in a vertical position, and the head 41a of the bolt 41 is exposed upward from the bracket main body 31. Therefore, the operator cannot tighten the bolt 41. Relatively easy.

That is, the construction worker can tighten the bolt 41 by inserting the impact driver into the head 41a from above, and can work in a relatively easy posture. If the bolt 41 were to project horizontally to the outside of the sasara girder 95 as in the mounting bracket of Patent Document 1, the construction worker would not be able to reach out from the inside of the landing 93 and operate the impact driver. Have difficulty. In addition, since walls and columns may already exist on the side of the steel-framed staircase 91, if the bolt protrudes horizontally to the outside of the Sasara girder 95, it may not be possible to secure a space for inserting the impact driver. There is also On the other hand, with the mounting bracket 1, it is easy to secure a space for inserting the impact driver even when there is a wall or a pillar on the side of the steel staircase 91.

In addition, in the installation work of the temporary handrail 3 in the mounting bracket 1, the holding piece 37 is pressed against the outer surface of the sasara girder 95 while moving in the plate thickness direction of the sasara girder 95. The end surfaces 38h and 38k of the fixed holding portion 38 are pressed against the inner surface of the fixed holding portion 38 while being immovable. Therefore, the surface of the sasara girder 95 is less likely to be scratched in comparison with the method of tightening the clamping object while the movable member slides on the surface of the object to be held in the in-plane direction, as in the mounting bracket of Patent Document 1 described above. Further, the contact surface 37a pressed against the outer surface of the sasara girder 95 is in surface contact with the surface of the sasara girder 95 over a relatively large area. That is, as can be understood from FIG. 3(c) and the like, the contact surface 37a is a U-shaped surface having a width corresponding to the thickness of the steel plate that is the material of the holding piece 37. As shown in FIG. For example, compared with other mounting brackets that directly press the tip surface of the tightening bolt against the object, the contact surface 37a of the mounting bracket 1 is in surface contact with the surface of the sasara girder 95 with a sufficiently large area. I can say. The end faces 38h and 38k of the fixed holding portion 38 that are pressed against the inner surface of the sasara girder 95 are also surfaces having a width corresponding to the thickness of the steel plate that is the material of the front plate 31a and the rear plate 31b. Similarly, it can be said that it is in surface contact with the surface of the sasara girder 95 with a sufficiently large area. Therefore, the configuration of the contact surface 37a and the end surfaces 38h and 38k also contributes to the effect of making the surface of the sasara girder 95 less likely to be scratched.

(Second embodiment)
Next, a mounting bracket 51 according to a second embodiment of the present invention will be described with reference to FIGS. 5 to 7. FIG. FIG. 5 is a side view showing an example of the mounting state of the temporary handrail 53 using the mounting bracket 51 of this embodiment. The temporary handrail 53 of this example is temporarily installed on the staircase portion 94 of the steel-framed staircase 91 under construction. , 51 at two points on the lower end.

The temporary handrail 53 is obtained by transforming the temporary handrail 3 for the landing described in the first embodiment into a parallelogram so as to correspond to the inclination of the staircase portion 94 . Since the temporary handrail 53 has the same configuration as the temporary handrail 3, including the telescopic structure of the temporary handrail, the same or equivalent components as those of the temporary handrail 3 are denoted by the same reference numerals in the drawings, and overlapping explanations are omitted. omitted. As a difference from the temporary handrail 3 , the temporary handrail 53 is provided with pillars 97 , 97 provided at two locations on the lower frame portion 15 . One of the columns 97 is made of a round pipe material fixed vertically to the outer cylindrical portion 15a of the lower rail portion 15, and extends downward from the lower surface of the outer cylindrical portion 15a. The other strut 97 is similarly fixed to the inner cylindrical portion 15b of the lower rail portion 15. As shown in FIG. Mounting metal fittings 51, 51 are attached to the respective struts 97, 97 as described above.

FIG. 6 is a perspective view showing the mounting bracket 51 and the like, and FIG. 7 is a sectional view thereof. The mounting bracket 51 includes a post holder 54 in place of the handrail receiving groove 33 (see FIG. 3) of the mounting bracket 1 of the first embodiment. The column holding portion 54 is arranged on the right side of the girder insertion groove 35 , and the right end wall of the metal fitting main body 31 of the column holding portion 54 has a semi-cylindrical shape corresponding to the column 97 . Furthermore, a circular opening 55 corresponding to the diameter of the post 97 is formed in the upper surface of the metal fitting main body 31 . A guide hole 57 extending in the circumferential direction of the cylinder and penetrating in the wall thickness direction is formed in the semi-cylindrical wall. The guide hole 57 extends from the front side to the back side of the metal fitting main body 31 in FIG.

When the mounting bracket 51 is attached to the temporary handrail 53, the post 97 of the temporary handrail 53 is inserted into the post holding portion 54 as described above. A guide pin 97a projecting in the radial direction is formed on the outer peripheral surface of the column 97. By fitting the guide pin 97a into the guide hole 57, the column holding portion 54 is prevented from slipping out of the column 97 in the axial direction. keeping. Further, since the guide pin 97a can move in the guide hole 57 in the circumferential direction, the support 97 can rotate about its axis within the support 54 by 180°. That is, the mounting bracket 1 is in a state in which the support 97 is held so as to be rotatable by 180°.

A guide pin 97a of the support 97 is detachably attached to the main body of the support 97 in order to facilitate smooth attachment of the mounting bracket 51 to the support 97. As shown in FIG. At the time of mounting, after the main body of the post 97 is inserted into the post holding portion 54 without the guide pin 97 a, the guide pin 97 a is attached to the main body of the post 97 through the guide hole 57 . The configuration of the mounting bracket 51 other than the support column holding portion 54 as described above is the same as that of the mounting bracket 1 of the first embodiment. Duplicate explanations are omitted.

Next, the effects of the mounting bracket 51 will be described. As for the temporary handrail 53 for the stairway section 94, it is installed between the right handrail attached to the sasara girder 96 on the right side of the stairway section 94 and the left handrail attached to the sasara girder 96 on the left side of the stairway section 94. The orientation of the mounting bracket 51 to be mounted is different by 180°. Therefore, if the mounting bracket 51 is adopted, the mounting bracket 51 can be rotated 180° with respect to the temporary handrail 53 as described above, so that the right side/left side can be easily changed. Therefore, it is possible to standardize the method of attaching the mounting bracket 51 to the temporary handrail 53, and if the mounting bracket 51 is rotated immediately before the temporary handrail 53 is installed on the Sasara girder 96 to determine whether it is for the right side or the left side. good. Also, the baseboard 21 of the temporary handrail 53 can be attached to either the front or back surface of the temporary handrail 53, and immediately before the temporary handrail 53 is installed on the sasara girder 96, it is made to correspond to the right side/left side. may be attached to the surface of the

Since the temporary handrail 3 for the landing of the first embodiment does not have the right/left concept as described above, it is possible to use a mounting bracket 1 that is fixed to the temporary handrail 3 by welding. It is enough. On the other hand, the mounting bracket 51 of the present embodiment is preferably applied to the temporary handrail 53 for the staircase portion 94 of the steel staircase 91 .

The present invention can be embodied in various forms with various modifications and improvements based on the knowledge of those skilled in the art, including the embodiment described above. Moreover, it is also possible to configure modifications of the embodiments by using the technical matters described in the above-described embodiments. You may use it, combining the structure of each embodiment etc. suitably. For example, in the above-described embodiment, the mounting bracket of the present invention was applied to the temporary handrail of the steel staircase 91, but it may be applied to the temporary handrail used during the construction of various other structures.

1, 51... Mounting metal fittings, 3... Temporary handrails, 31... Metal fitting body, 37... Sanding piece (second holding part), 38... Fixed holding part (first holding part), 39... Wedge piece (conversion Mechanism), 39a... Wedge surface, 41... Bolt, 41a... Head (operation reception part), 51... Mounting metal fitting, 53... Temporary handrail, 54... Post holder, 91... Steel stairs, 95, 96... Sasara girder, 97 .

Claims (5)

At a construction site of the structure where a first region and a second region are partitioned by a predetermined plate-shaped portion that is a portion of the structure under construction and a temporary handrail attached to the plate-shaped portion, A temporary handrail mounting bracket for mounting the temporary handrail to a plate-like portion,
a fitting body for holding the temporary handrail;
a first holding portion provided on the metal fitting main body and arranged in the first region;
The plate-shaped portion provided in the metal fitting main body and arranged in the second region and inserted between the first holding portion moves in the thickness direction of the plate-like portion, and the plate-like portion moves between the first holding portion. a second holding portion that holds the plate-like portion;
An operation receiving portion disposed in the second region, attached to the metal fitting body in a posture parallel to an extending direction of the temporary handrail from the metal fitting body, exposed from the metal fitting body in the extending direction, and receiving a user operation. a movable shaft portion capable of moving in its own axial direction in accordance with the operation of the operation receiving portion;
a temporary handrail mounting bracket provided in the second region and configured to convert movement of the movable shaft portion into movement of the second holding portion. The movable shaft portion
having a bolt that is screwed into the metal fitting body and includes a head as the operation receiving portion;
The conversion mechanism is
a wedge member that includes a wedge surface that slides on the second holding portion and pushes the second holding portion in the plate thickness direction via the wedge surface while moving in the axial direction with the movable shaft portion; having
A temporary handrail mounting bracket according to claim 1. The structure is a steel-framed staircase, the plate-like portion is a sasara girder of the steel-framed staircase, the first area is an area inside the steel-framed staircase, and the second area is an area outside the steel-framed staircase. The temporary handrail mounting bracket according to claim 1 or 2, wherein: 4. The temporary handrail mounting bracket according to claim 3, wherein the lower end portion of the portion on the first area side is arranged at a position higher than the lower end portion of the portion on the second area side. 5. The temporary handrail mounting bracket according to claim 3, wherein said metal fitting main body has a holding portion for rotatably holding a post of said temporary handrail.

Images