Handrail installation structure

Abstract

To provide handrail mounting hardware that can be utilized when installing handrails along a sliver.SOLUTION: An embodiment of the present invention comprises: a clamp 2 attached to a sliver; a body pipe 3 attached to the clamp 2; a push bolt 5 fixing a handrail support pipe 4 inserted into the body pipe 3; and self-rotation restricting means 6 that limits the rotation of the body pipe 3 to within a range of 180 degrees. A strip plate 12 inserted inside the handrail support pipe 4 so that the width direction is aligned to the diameter direction of the handrail support pipe 4 is fixed. The self-rotation restricting means 6 consists of a long hole 15 provided in the circumferential wall of the body pipe 3 along the circumferential direction within 180 degrees, and a self-rotation restricting bolt 16 fastened from this long hole 15 through through holes 14a / 14b in the handrail support pipe 4 to a mounting screw hole 13. When the self-rotation restricting bolt 16 is positioned at either end of the semicircular hole 15, the push bolt 5 is aligned with the cross section in the width direction of the strip plate 12.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] This invention is applied to the side of temporary passages such as stairs and landings. Installing handrails For Handrail installation structure This is regarding. [Background technology]

[0002] This kind of Handrail installation structure cannot cite any prior art documents, A handrail mounting bracket is attached to the side of the stairs, and a support pipe of the handrail is attached to the handrail mounting bracket. The handrail mounting bracket is: A handrail mounting bracket is known in the industry that includes a clamp to be attached to a scaffold on the side of a passageway such as a staircase, a main pipe for inserting a handrail post attached to the clamp, a handrail post fixing push bolt that fixes the handrail post pipe inserted into the main pipe to the main pipe, and a rotation limiting means that limits the rotation of the handrail post pipe relative to the main pipe to within a range of 180 degrees. The handrail attached to the scaffold on the side of the passageway with this handrail mounting bracket consists of multiple handrail post pipes arranged at appropriate intervals along the length of the scaffold, connected by handrail pipes parallel to the length of the scaffold, and mounting brackets attached to the lower ends of each handrail post pipe are attached to the scaffolds on both sides of the passageway. In this case, in situations where the wall of a building is adjacent to the outside of the scaffolding to which the handrail support is attached (outside the passageway), the main body pipe should be attached to the handrail support pipe in a direction that allows the horizontal fastening bolts of the clamp and the push bolts for fixing the handrail support pipe, which fix the handrail support pipe inserted into the main body pipe to the main body pipe, to protrude inside the scaffolding (inside the passageway) so as not to interfere with the wall of the building, and in situations where sufficient space can be secured on the outside of the scaffolding to which the handrail support pipe is attached (outside the passageway), the main body pipe should be attached to the handrail support pipe in a direction that allows the fastening bolts of the clamp and the push bolts for fixing the handrail support pipe to protrude outside the scaffolding (outside the passageway), thereby eliminating the risk of workers using the passage coming into contact with the fastening bolts of the clamp or the push bolts for fixing the handrail support pipe. Summary of the Invention [Problem to be solved by the invention]

[0003] As described above, with this type of handrail mounting bracket, it is necessary to select the direction of 180 degrees to attach the main pipe to the handrail support pipe depending on the situation; however, a handrail mounting bracket that can meet this requirement, yet allows a relatively thin-walled steel pipe to be used as the handrail support pipe, and is strong enough to allow for strong tightening of the push bolts used to secure the handrail support pipe has not yet been put into practical use. [Means for solving the problem]

[0004] The present invention provides a handrail installation method that can solve the above-mentioned problems of the conventional art. structure The present invention proposes a handrail mounting system. structure In order to facilitate understanding of the relationship with the embodiments described later, the reference symbols used in the description of the embodiments are shown in parentheses as follows: A handrail mounting structure in which a handrail mounting bracket (1) is attached to a slat (21) on the side of a staircase, and a handrail support pipe (4) is inserted into and fixed to the handrail mounting bracket (1) on the handrail supported by the slat (21). The handrail mounting bracket (1) is A clamp (2) is attached to the side of the aisle (21), and a Book The device is equipped with a body pipe (3), a handrail support pipe fixing press bolt (5) for fixing a handrail support pipe (4) inserted into the body pipe (3) to the body pipe (3), and a rotation limiting means (6) for limiting the rotation of the body pipe (3) relative to the handrail support pipe (4) within a range of 180 degrees. Handrail installation structure In The clamp (2) is composed of a gate-shaped clamp body (10) that can be fitted from above into the saddle (21), and a fastening bolt (11) that is screwed and penetrates horizontally through a through-threaded hole (7a) provided in the inner vertical plate portion (7) of the inner and outer vertical plate portions (7, 8) of the clamp body (10). The main pipe (3) has a lower end fixed to the top plate portion (9) of the clamp body (10). The rotation limiting means (6) is composed of an elongated hole (15) provided in the peripheral wall portion of the main pipe (3) along the circumferential direction, and a rotation limiting bolt (16) that is screwed and fastened through the elongated hole (15) into an attachment screw hole (13) provided in the handrail support pipe (4). The elongated hole (15) is a hole that is provided in the clamp body (10) of the main pipe (3) so as to be fitted from above into the saddle (21). a semicircular long hole (15) connecting two diametrical locations parallel to the inner and outer vertical plate portions (7, 8) of the clamp body (10) over a range of 180 degrees on the side of the inner and outer vertical plate portions (8) of the inner and outer vertical plate portions (7, 8) of the clamp body (10); a band-shaped plate (12) is fixed inside the handrail support pipe (4) so ​​that it is parallel to the length of the handrail support pipe (4) and its width direction is along the diametrical direction passing through the center position of the handrail support pipe (4); the mounting screw hole (13) is provided at the same height as the semicircular long hole (15) of the band-shaped plate (12), and through holes (14a / 14b) are provided in the handrail support pipe (4) concentrically with the mounting screw hole (13); The above The push bolt (5) for fixing the handrail post is positioned so that when the rotation limiting bolt (16) is positioned at either end of the semicircular long hole (15) and is screwed into the mounting screw hole (13) via the through hole (14a / 14b) from the outside of the semicircular long hole (15), the push bolt (5) for fixing the handrail post and the widthwise cross section of the band-shaped plate (12) are positioned in a straight line. Effect of the Invention

[0005] According to the above-mentioned configuration of the present invention, if the width direction of the band-shaped plate (12) fixed to the lower end of the handrail support pipe (4) is attached so that it is perpendicular to the length direction of the handrail which has multiple handrail support pipes, when the handrail mounting hardware of the present invention is attached to the lower end of this handrail support pipe by the rotation limiting bolt of the rotation limiting means, the inner and outer vertical plate parts of the clamp body will be parallel to the length direction of the slat to which the handrail is attached, and the fastening bolt of the clamp and the push bolt which fixes the handrail mounting hardware of the present invention to the lower end of the handrail support pipe will be perpendicular to the length direction of the slat. Therefore, the orientation of the handrail mounting hardware of the present invention can be changed by 180 degrees depending on the situation, such as whether or not the wall of the building is close to the outside of the slat, and the lower end of each handrail support pipe of the handrail can be easily attached to the slat.

[0006] Moreover, according to the above-mentioned configuration of the present invention, the mounting screw holes that must be located inside the lower end of the handrail support pipe, i.e., the band-shaped plate in which the mounting screw holes for mounting the rotation-limiting bolts of the rotation limiting means are provided, are able to withstand the tightening pressure of the push bolts that secure the handrail mounting fitting of the present invention to the handrail support pipe through the widthwise compressive stress of the band-shaped plate, and even if the handrail support pipe is made of a steel pipe with a relatively thin plate thickness, it is possible to reliably prevent the handrail support pipe from being compressed and deformed by the tightening pressure of the push bolts. Also, the structure is simpler and easier to assemble than when the mounting screw holes for mounting the rotation-limiting bolts of the rotation limiting means are provided in a cross member arranged along the diameter direction inside the handrail support pipe.

[0007] When carrying out the present invention, specifically, As described in claim 2 of the present invention, The lower end of the band-shaped plate (12) can be fixed to the inner peripheral surface of the lower end of the handrail support pipe (4) by welding, with the lower end of the band-shaped plate (12) coinciding with the lower end of the handrail support pipe (4). With this configuration, the band-shaped plate can be simply and easily welded with its width direction coinciding with the diameter direction of the handrail support pipe. As described in claim 3 of the present invention,The main pipe (3) can be attached to a position offset from the center of the top plate (9) of the gate-shaped clamp body (10) toward the side where the outer vertical plate (8) is located, so that the outer surface of the main pipe (3) is flush with the outer surface of the outer vertical plate (8) of the gate-shaped clamp body (10). With this configuration, even in a situation where the wall of a building is close to the outside of the scaffolding, as long as the outer vertical plate of the clamp body can be inserted into the narrow gap between the scaffolding and the building wall, the handrail mounting bracket of the present invention can be attached to the scaffolding to support the handrail.

[0008] Furthermore, as described in claim 4 of the claims, The mounting screw hole (13) provided in the band-shaped plate (12) penetrates the band-shaped plate (12), and the through holes (14a, 14b) provided in the handrail support pipe (4) concentrically with the mounting screw hole (13) and through which the rotation-limiting bolt (16) is inserted can be provided on both diametrical sides of the handrail support pipe (4). With this configuration, when attaching the handrail mounting hardware of the present invention to the lower end of each handrail support pipe of the handrail, the rotation-limiting bolt can be inserted from either diametrical side of the main pipe, making assembly simple, easy, and efficient.

[0009] still, As described in claim 5 of the present invention, Handrail installation of the present invention structure In the case where the handrail support pipe (4) of the handrail to be attached to the scaffolding includes a handrail support pipe (24c, 24d) with a large outer diameter and a handrail support pipe (25c) with a small outer diameter, the main pipe (3) for inserting the handrail support can have an inner diameter that matches the handrail support pipe (24c, 24d) with a large outer diameter, and a steel pipe (25d) with the same outer diameter as the steel pipe constituting the handrail support pipe (24c, 24d) with a large outer diameter can be fixed to the lower end of the handrail support pipe (25c) with a small outer diameter. With this configuration, it is no longer necessary to prepare two types of handrail mounting hardware of the present invention, one for use with handrail support pipes with a large outer diameter and the other for use with handrail support pipes with a small outer diameter, and one type of handrail mounting hardware can be attached to either handrail support pipe without any problems. The four specific modified examples described in claims 2 to 5 above are described in the claims as being subordinate only to the basic configuration of the present invention shown in claim 1. However, as shown in one preferred embodiment of the present invention described below based on the attached drawings, it is possible to incorporate all four specific modified examples and implement the invention, or it is possible to incorporate any one or a selected number of modified examples into the embodiment and put the invention into practical use depending on the application and other implementation requirements. [Brief description of the drawings]

[0010] [Figure 1] Figure 1 shows a vertical cross-sectional view of the lower end of a handrail support pipe before installation, and a side view of the handrail mounting bracket. The vertical cross-sectional views of the lower end of the handrail support pipe show two types of handrail support pipes, one that is thick and one that is thin. [Diagram 2] FIG. 2 is a side view showing the handrail mounting bracket with the handrail support pipe attached. [Diagram 3] FIG. 3 is a front view showing the upper handrail mounting bracket. [Figure 4] FIG. 4 is a rear view showing the upper handrail mounting bracket. [Diagram 5] FIG. 5 is a plan view showing the upper handrail mounting bracket. [Figure 6] FIG. 6 is a cross-sectional view taken along line AA in FIG. [Figure 7] FIG. 7 is a cross-sectional view taken along line BB in FIG. [Figure 8] FIG. 8 is a front view of a handrail attached to the side of a horizontal walkway (landing) and an enlarged vertical cross-sectional view of a portion of the handrail. [Figure 9] FIG. 9 is a front view showing a handrail attached to the side of an inclined walkway (stairs). [Figure 10] FIG. 10 is a vertical cross-sectional side view showing the handrail mounting bracket attached to the scaffolding on the side of the aisle. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] One embodiment of the present invention will be described with reference to Figures 1 to 7. Handrail mounting bracket 1 consists of clamp 2 and main pipe 3. Main pipe 3 is provided with push bolt 5 for fixing the handrail post to prevent handrail support pipe 4 inserted into main pipe 3 from coming loose. Main pipe 3 and handrail support pipe 4 are provided with rotation limiting means 6 which allows handrail support pipe 4 to rotate within a range of 180 degrees before it is fixed to main pipe 3 by push bolt 5.

[0012] The clamp 2 is composed of a gate-shaped clamp body 10 consisting of inner and outer vertical plate parts 7, 8 and a top plate part 9, and a fastening bolt 11 which is screwed horizontally through a through-screw hole 7a (see Fig. 7) provided in the inner vertical plate part 7 of the clamp body 10. The clamp body 10 is not a thin plate structure such as an iron plate bent into a U-shape, but is a high-strength one in which each plate part is sufficiently thick and manufactured by casting. The inner vertical plate part 7 has the minimum height required to provide the through-screw hole 7a through which the fastening bolt 11 is screwed, and the outer vertical plate part 8 is taller than the inner vertical plate part 7.

[0013] The main body pipe 3 has an outer diameter smaller than the width of the top plate portion 9 of the clamp body 10, and the lower end of this main body pipe 3 is fixed to the upper surface of the top plate portion 9 by welding and integrated with it, with the lower end being shifted from the center of the top plate portion 9 toward the side of the outer vertical plate portion 8. Specifically, the main body pipe 3 is shifted as far as possible toward the side of the outer vertical plate portion 8, so that the outer peripheral surface of the main body pipe 3 (the outer peripheral surface of the upper end overhanging flange portion 3a) comes into contact with an imaginary plane extending upward from the outer surface of the outer vertical plate portion 8.

[0014] The handrail support pipe 4 is made of a thin-walled steel pipe compared to the main pipe 3, with an outer diameter slightly smaller than the inner diameter of the main pipe 3, and inside it is fixed a thick band-shaped plate 12 of the maximum width that can be inserted into the handrail support pipe 4 (a width slightly shorter than the inner diameter of the handrail support pipe 4). This band-shaped plate 12 has a length shorter than the overall length of the main pipe 3, and its lower end is flush with the lower end of the handrail support pipe 4, with both ends in the width direction of the lower end of the band-shaped plate 12 and the inner circumferential surface of the lower end of the handrail support pipe 4 welded within the range that can be worked from the lower end of the handrail support pipe 4 to be fixed integrally with the handrail support pipe 4. This strip 12 has a screw hole 13 that penetrates in the diameter direction intersecting with the centre of the handrail support pipe 4, located approximately the width of the strip 12 above its lower end, and the handrail support pipe 4 has through holes 14a, 14b on both diametrical sides concentric with the screw hole 13 and larger in diameter than the screw hole 13.

[0015] The main pipe 3 has semicircular long holes 15 that connect two points on both sides of the diameter of the main pipe 3 in a direction parallel to the length of the inner and outer vertical plate portions 7, 8 of the clamp body 10 over a range of 180 degrees on the side where the outer vertical plate portion 8 of the clamp body 10 is located, at the height of the through holes 14a, 14b when the handrail support pipe 4 is inserted into the main pipe 3 and the lower end of the handrail support pipe 4 is placed on the top plate portion 9 of the clamp body 10. The vertical width of this semicircular long hole 15 is not smaller than the diameter of the through holes 14a, 14b of the handrail support pipe 4 inserted into the main pipe 3, and the tip screw shaft portion 16a of the rotation limiting bolt 16 is inserted into the handrail support pipe 4 from the outside of this semicircular long hole 15, passing through the through hole 14a on one side of the handrail support pipe 4, and is screwed and fastened to the mounting screw hole 13 of the strip plate 12 inside the handrail support pipe 4.

[0016] The length of the tip screw shaft 16a of the rotation limiting bolt 16 is configured so that, even when the tip screw shaft 16a is screwed into the mounting screw hole 13 up to the base end position, the cylindrical head 16b with a hexagonal hole on the end face of the rotation limiting bolt 16 is located a little away from the outer circumferential surface of the main pipe 3 and does not reach the through hole 14b located on the opposite side of the handrail support pipe 4. Therefore, while the main pipe is prevented from being pulled out of the handrail support pipe 4 by the rotation limiting bolt 16 and the semicircular long hole 15, the rotation limiting bolt 16 can be rotated in any direction, forward or backward, relative to the handrail support pipe 4 within a range of 180 degrees from one end of the semicircular long hole 15 to the other end. In other words, the rotation limiting means 6 is configured by the rotation limiting bolt 16 attached to the handrail support pipe 4 so as to protrude radially from the handrail support pipe 4, and the semicircular long hole 15 provided in the main pipe 3.

[0017] When the handrail support pipe 4 is rotated and the rotation-limiting bolt 16 abuts against one end or the other of the semicircular elongated hole 15 to limit rotation, the rotation-limiting bolt 16 is in a horizontal position parallel to the length of the inner and outer vertical plate sections 7, 8 of the clamp body 10, and the band-shaped plate 12 is in a position along the diameter of the handrail support pipe 4, perpendicular to the axial direction of the rotation-limiting bolt 16. A handrail support fixing push bolt 5 is provided on the main pipe 3 to fix the handrail support pipe 4 in this position to the main pipe 3. That is, the main pipe 3 is provided with a cylindrical female threaded body 17 fixed in the radial direction of the main pipe 3 at the same height as the semicircular long hole 15 directly above the vertical plate portion 7 inside the clamp body 10, and the main pipe 3 is provided with a through hole of a larger diameter than the through screw hole 17a of the cylindrical female threaded body 17 and concentric with the through screw hole 17a of the cylindrical female threaded body 17, so that the push bolt 5 for fixing the handrail post can be screwed through from the outside of the cylindrical female threaded body 17 to the inside of the main pipe 3. The main pipe 3 is provided with reinforcing vertical thick plate portions 18a, 18b at the recessed corner between the cylindrical female threaded body 17 and the upper end of the main pipe 3, and at the recessed corner between the cylindrical female threaded body 17 and the lower end of the main pipe 3 (top plate portion 9 of the clamp body 10).

[0018] To explain how to use the handrail mounting bracket 1 configured as above, in a horizontal walkway 19 such as a landing shown in Fig. 8, or an inclined walkway 20 on which stairs are constructed shown in Fig. 9, vertical steel plates commonly known as scaffolding 21 are arranged on both the left and right sides of these walkways 19, 20. A horizontal walkway handrail 22 shown in Fig. 8 or an inclined walkway handrail 23 shown in Fig. 9 is attached to this scaffolding 21. As an example of a horizontal passage handrail 22 or an inclined passage handrail 23 with a structure that allows the overall length to be changed, it consists of a handrail main body 24 and a movable handrail 25 that can be inserted and removed freely relative to the handrail main body 24. The handrail main body 24 consists of two tiers of handrail pipes 24a, 24b, one above and one below, and two support pipes 24c, 24d that connect and integrate these two tiers of handrail pipes 24a, 24b. The movable handrail 25 is made up of two tiers of handrail pipes 25a, 25b that are fitted into the upper and lower tiers of handrail pipes 24a, 24b of the handrail main body 24 so that they can be inserted and removed freely, one support pipe 25c that connects and integrates the upper and lower tiers of handrail pipes 25a, 25b, and a fixing bolt 26 that fixes the movable handrail 25 when it is inserted and removed relative to the handrail main body 24. The lower ends of all of the support pipes 24c, 24d, 25c of the handrail 23 for the inclined passage are bent so as to be inclined at a right angle to the longitudinal direction of the scaffolding 21 in the inclined passage 20.

[0019] All of the pipes 24a-24d that make up the handrail main body 24 are thick steel pipes of the same diameter, and all of the pipes 25a-25c that make up the movable handrail 25 are thin steel pipes of the same diameter that can be inserted into the pipes 24a-24d. Therefore, at the lower end of one support pipe 25c of the movable handrail 25 that is made of a thin steel pipe, a thick external fitting steel pipe 25d, which is made by cutting the same steel pipe as the thick pipes 25a-25c that make up the handrail main body 24 to approximately the same length as the main pipe 3, is externally fitted and welded to the bottom so that the bottom ends are flush with each other, so that the outer diameter D of the bottom ends of all the support pipes 24c, 24d, 25c is the same, as shown in the partially enlarged vertical cross-sectional views of Figures 1 and 8. In this case, the through holes 14a, 14b provided so as to penetrate diametrically through the lower end of the original thin support pipe 25c are provided across the inner thin support pipe 25c and the thick outer fitting steel pipe 25d fixedly fitted thereto.

[0020] When attaching a horizontal walkway handrail 22 to a horizontal walkway 19 such as a landing shown in Figure 8, or when attaching an inclined walkway handrail 23 to an inclined walkway 20 on which a staircase is constructed as shown in Figure 9, the lower ends of all of the support pipes 24c, 24d, 25c (the lower end of the support pipe 25c has a thick external fitting steel pipe 25d fixed thereto) are machined to the same structure as the lower end of the handrail support pipe 4 in the above embodiment, and then the handrail mounting bracket 1 is attached. At this time, the strip 12 which is fitted and fixed to the lower end of each support pipe 24c, 24d, 25c is fixed so that the width direction of the strip 12 is perpendicular to the longitudinal direction of each handrail 22, 23. Therefore, the rotation limiting bolt 16 of the rotation limiting means 6 which protrudes outside the main pipe 3 protrudes toward either the front or rear of the longitudinal direction of each handrail 22, 23 relative to the main pipe 3, and when the push bolt 5 is not tightened, the main pipe 3 of the handrail mounting bracket 1 is able to rotate within a range of 180 degrees relative to the lower end of each support pipe 24c, 24d, 25c.

[0021] When attaching a horizontal walkway handrail 22 to the scaffolding 21 beside the horizontal walkway 19, or when attaching an inclined walkway handrail 23 to the scaffolding 21 beside the inclined walkway 20, the handrail mounting brackets 1 attached to the lower ends of all of the support pipes 24c, 24d, 25c are fixed to the top of the scaffolding 21 by fitting their clamps 2 into the scaffolding 21 from above and tightening the fastening bolts 11. However, when the building wall 27 is located close to the outside of the scaffolding 21 as shown on the right side of Figure 10, each handrail mounting bracket 1 is rotated relative to the lower ends of the support pipes 24c, 24d, 25c so that the fastening bolts 11 and push bolts 5 of the clamps 2 protrude inside the scaffolding 21, that is, toward the side of the horizontal walkway 19 or inclined walkway 20 relative to the scaffolding 21, and then the clamps 2 are fitted into the scaffolding 21 from above. As a result, the outer vertical plate portion 8 of the clamp 2 can be inserted into the narrow gap between the scaffold 21 and the wall 27 of the building, and the fastening bolts 11 and pushing bolts 5 of the clamp 2 do not interfere with the wall 27 of the building. The fastening bolts 11 and pushing bolts 5 of the clamp 2 can be tightened from inside the passageway to fix the handrail mounting bracket 1 to the scaffold 21 and to fix the handrail mounting bracket 1 to the lower ends of the support pipes 24c, 24d, and 25c.

[0022] 10, for the side of the scaffolding 21 where the building wall 27 is not close to the outside of the scaffolding 21, the clamp 2 can be attached to the scaffolding 21 with each handrail mounting bracket 1 rotated relative to the lower ends of the support pipes 24c, 24d, 25c so that the fastening bolts 11 and pushing bolts 5 of the clamp 2 protrude outside the scaffolding 21, that is, on the side opposite the horizontal walkway 19 and inclined walkway 20. By attaching the horizontal walkway handrail 22 and inclined walkway handrail 23 in this manner, there is no risk of the fastening bolts 11 and pushing bolts 5 of the clamp 2 interfering with the feet of workers walking along the horizontal walkway 19 and inclined walkway 20. Of course, if the finished surface level of the horizontal passage 19 or the inclined passage 20 is above the lower end of the taller outer vertical plate portion 8 of the clamp body 10, the handrail mounting bracket 1 can be attached to the scaffold 21 in such a way that the shorter inner vertical plate portion 7 of the clamp body 10 is positioned inside the scaffold 21, as shown on the right side of Figure 10.

[0023] When carrying out the present invention, the band-shaped plate 12 in which the screw holes 13 are provided may have a length such that the lower end is located above the lower end of the handrail support pipe 4, within a range in which the lower end can be welded to the inner peripheral surface of the handrail support pipe 4. In the illustrated example, the push bolt 5 is provided on the main pipe 3 at the same height as the screw holes 13 provided in the band-shaped plate 12, but the position of the push bolt 5 can be changed in the vertical direction as long as it is within the range of the length of the band-shaped plate 12. Furthermore, the band-shaped plate 12 can be made thick so that the tip screw shaft 16a of the rotation limiting bolt 16 does not penetrate the screw holes 13 provided in the band-shaped plate 12, and although through holes 14a, 14b are provided concentrically on both diametrical sides of the handrail support pipe 4, a through hole may be provided on only one side to keep the insertion direction of the rotation limiting bolt 16 into the handrail support pipe 4 constant. [Industrial Applicability]

[0024] INDUSTRIAL APPLICABILITY The handrail mounting bracket of the present invention can be effectively used as a handrail mounting bracket that is attached to the lower end of each support pipe of a handrail when the handrail is attached along a scaffold. [Explanation of symbols]

[0025] 1 Handrail mounting bracket 2 Clamp 3 Main pipe 3a Upper end overhang flange 4 Handrail support pipe 5 Push Bolt 6 Rotation restriction measures 7 Inner vertical plate 7a Through screw hole 8 Outer vertical plate 9 Top plate 10 Clamp body 11 Fastening bolt 12 Strip 13 Mounting screw holes 14a,14b through hole 15 Semicircular slot 16 Rotation limiting bolt 16a Tip spiral part 16b Cylindrical head 17 Cylindrical female thread body 17a Through screw hole 18a,18b Vertical thick plate for reinforcement 19 Horizontal passage 20 Inclined passage 21 Sasara 22 Horizontal walkway handrails 23 Handrails for inclined passages 24 Handrail body 24a, 24b, 25a, 25b Handrail pipe 24c, 24d, 25c Support pipe 25 Movable handrail 25d Thick external fitting steel pipe 26 Fixing bolt 27 Building Wall

Claims

1. A handrail mounting structure in which a handrail mounting bracket is attached to a scaffold on the side of a staircase, and a handrail supported by the scaffold is provided with a handrail support pipe that is inserted into and fixed to the handrail mounting bracket, the handrail mounting bracket comprising a clamp that is attached to the scaffold on the side of the staircase, a main pipe attached to the clamp, a handrail support fixing push bolt that fixes the handrail support pipe inserted into the main pipe to the main pipe, and rotation limiting means that limits the rotation of the handrail support pipe relative to the main pipe to within a range of 180 degrees, The clamp is composed of a gate-shaped clamp body that can be fitted onto the saddle from above, and a fastening bolt that is screwed horizontally through a through-screw hole provided on the inner and inner vertical plate parts of both the inner and outer vertical plate parts of the clamp body, the lower end of the main body pipe is fixed onto the top plate part of the clamp body, and the rotation limiting means is composed of a long hole provided along the circumferential direction on the peripheral wall part of the main body pipe, and a rotation limiting bolt that is screwed through the long hole and fastened into a mounting screw hole provided on the handrail support pipe, and the long hole is a semicircular long hole that connects two diametrical points of the main body pipe that are parallel to the inner and outer vertical plate parts of the clamp body over a range of 180 degrees on the sides of the inner and outer vertical plate parts of the inner and outer vertical plate parts of the clamp body. a band-shaped plate is fixed inside the handrail support pipe, the band-shaped plate being parallel to the length of the handrail support pipe and whose width direction is along the diameter direction passing through the centre of the handrail support pipe, the mounting screw hole is provided at the same height as the semicircular long hole of the band-shaped plate and a through hole is provided in the handrail support pipe concentrically with the mounting screw hole, the rotation limiting bolt is screwed into the mounting screw hole from the outside of the semicircular long hole through the through hole, and the handrail support post fixing push bolt is positioned so that when the rotation limiting bolt is located at either end of the semicircular long hole, the handrail support post fixing push bolt and the width direction cross section of the band-shaped plate are located on a straight line.

2. 2. The handrail mounting structure according to claim 1, wherein the lower end of the band-shaped plate is aligned with the lower end of the handrail support pipe, and the lower end of the band-shaped plate and the inner surface of the lower end of the handrail support pipe are fixed to each other by welding.

3. The handrail mounting structure described in claim 1, wherein the main pipe is attached at a position offset from the center of the top plate portion of the gate-shaped clamp body toward the side where the outer vertical plate portion is located, and the outer surface of the main pipe is configured to be flush with the outer surface of the outer vertical plate portion of the gate-shaped clamp body.

4. 2. The handrail mounting structure as described in claim 1, wherein the mounting screw holes provided in the band-shaped plate are passed through the band-shaped plate, and the through holes provided in the handrail support pipe concentrically with the mounting screw holes and through which rotation-limiting bolts are inserted are provided on both diametrical sides of the handrail support pipe.

5. 2. The handrail mounting structure as set forth in claim 1, wherein the handrail support pipes include a handrail support pipe with a large outer diameter and a handrail support pipe with a small outer diameter which can be freely inserted and removed into the handrail support pipe with the large outer diameter, the main pipe into which the handrail support is inserted has an inner diameter that matches the handrail support pipe with the large outer diameter, and a steel pipe of the same outer diameter as the handrail support pipe with the large outer diameter is fixedly fitted onto the lower end of the handrail support pipe with the small outer diameter.

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