JP2024116595A - Support material mounting device - Google Patents

Abstract

To provide a mounting device which can be utilized as means for supporting a support material such as a safety handrail.SOLUTION: A mounting device of a support material includes a pipe body 10 for supporting which is fastened and erected to a structure 9, and a support material supporting pipe 1 which is inserted to the pipe body for supporting and projects upward from a placed concrete layer 12, in which a support material 11 such as a safety handrail is inserted into the support material supporting pipe and held thereon, wherein the support material supporting pipe 1 is formed into such a tapered part 1a that a part from an intermediate height to a lower end has a diameter reduced toward a lower end side, an inner diameter gradually reduced part 4 having an inner diameter gradually reduced toward the lower end side is provided inside the tapered part, an inward overhang part 5 that receives the lower end of the support material 11 is provided on the lower end of the inner diameter gradually reduced part, a plurality of notch slits 6 extending upward from the lower end of the tapered part 1a are formed in the circumferential direction, and the diameter of the tapered part 1a is enlarged accompanied by expansion of the respective slits by the inserted support material.SELECTED DRAWING: Figure 7

Description

The present invention relates to a mounting device for supporting support materials such as safety railings that are temporarily installed on a structure under construction.

When supporting posts such as safety handrails are inserted into a support pipe fixed upright on the top surface of a structure under construction, such as a horizontally erected steel frame such as an H-shaped steel beam, a support pipe is used to fill the gap between the support pipe and the post to position the post concentrically without rattling. In the mounting device shown in Patent Document 1, the lower end of the support pipe is formed with a small diameter that is drawn so that the lower end of the post fits exactly inside, and the support pipe that fits around the post is fitted inside the large-diameter upper end of the support pipe, so that the lower end and the mid-height of the post are concentrically positioned on the support pipe. In addition, in the mounting device shown in Patent Document 2, the support tube is a straight tube with the same diameter from the top to the bottom, and a support material with an outer diameter smaller than the inner diameter of the support tube is inserted to the bottom of the support tube. The tapered portion of the support material support pipe with a cut slit is pressed between the top end of the support tube and the support material located inside, and the support material is positioned and held concentrically with the support tube.

Japanese Patent Application Publication No. 8-100536 Japanese Patent Application Publication No. 9-013690

In the mounting devices described in either of Patent Documents 1 and 2, if rainwater accumulates in the support pipe due to rainfall before concrete is poured, the support material such as a safety handrail, which is generally made of steel pipe, is inserted into the support pipe where the rainwater has accumulated, causing the lower end of the support material to rust and resulting in a decrease in strength. In order to solve this problem, it is possible to open a drain hole in the lower end of the peripheral wall of the support pipe, but in the mounting devices described in either of Patent Documents 1 and 2, the support material extends to the lower end of the support pipe in an exposed state, and the support material support pipe, which is inserted between the support pipe and the support material and holds the support material concentrically with the support pipe, is located above and away from the lower end of the support material, so that when concrete is poured, concrete or its mortar components enter the support pipe through the drain hole and harden in contact with the lower end of the support material inside the support pipe. As a result, the support material cannot be removed from the support pipe smoothly and easily after the construction is completed. Furthermore, the installation device described in Patent Document 1 requires the preparation of a specially shaped pipe consisting of a small-diameter lower half and a large-diameter upper half as the support pipe, which increases costs, and the installation device described in Patent Document 2 is configured so that the intermediate height portion of the support material, which is separated upward from the lower end, is positioned concentrically with respect to the support pipe by the support pipe support pipe inserted between the support pipe and the support material, so the positioning effect of the support material with respect to the support pipe is weak, and there is a risk that the support material will easily swing due to external forces acting on the support material.

The present invention proposes a post mounting device that can solve the above-mentioned problems of the prior art. The post mounting device of the present invention, with the reference symbols used in the description of the embodiment described below in parentheses to facilitate understanding of the relationship with the embodiment described below, comprises a support pipe (10) fixed to the structure (9) and whose entire length is buried in the poured concrete layer, and a support pipe (12) inserted into the support pipe (10) and protruding above the poured concrete layer (12). The device for mounting a support material such as a safety handrail includes a support material support pipe (1) and a support material (11) such as a safety handrail is inserted and held in the support material support pipe (1). The support pipe (10) is a straight pipe having a uniform diameter from its upper end to its lower end, and the support material support pipe (1) includes a tapered portion (4) that is inserted into the support pipe (10) and whose lower end abuts against the bottom of the support pipe (10). When the tapered portion (4) is inserted to the bottom of the support pipe (10), The outer peripheral surface of this tapered portion (4) is configured to be in pressure contact with the inner peripheral surface at the upper end of the support tube (10), and the tapered portion (4) of the support pipe (1) is provided with an inner diameter gradually decreasing portion (1a) whose inner diameter becomes smaller toward the lower end, and the lower end of this inner diameter gradually decreasing portion (1a) is provided with an inward protruding portion (5) that receives the lower end of the support pipe (1) inserted into the support pipe (1), and further the inner diameter gradually decreasing portion (1a) is provided with a notch extending upward from its lower end. A plurality of slits (6) are formed in the circumferential direction, and the support material (11) inserted into the gradually tapering inner diameter portion (1a) is configured to expand the diameter of the gradually tapering inner diameter portion (1a) with the expansion of each slit (6). When the support material (11) is inserted into the support material support pipe (1) to a depth where it can be received by the overhanging portion (5), the lower end of the support material support pipe (1) expanded in diameter by the support material (11) abuts against the inner surface of the lower end of the support tube (10).

According to the above-mentioned configuration of the present invention, the support pipe can be made of a straight pipe, so it can be implemented at a low cost, compared to the configuration described in Patent Document 1. The support pipe supports the support material, so that above the tapered portion of the inner diameter, there is an area where the support material can be supported without rattling, that is, an area of the minimum inner diameter through which the support material can pass. Therefore, when the support material is inserted into the support pipe inserted into the support pipe, the support material is positioned concentrically with the support pipe at two points, the lower end of the tapered portion of the support pipe pushed open by the lower end of the support material, and the mid-height portion of the support pipe located inside the upper end of the support pipe. Moreover, these two points are separated by a distance not much different from the entire length of the support pipe, so that the support material inserted into the support pipe is reliably and strongly held in a concentric position with the support pipe, compared to the configuration described in Patent Document 2. Furthermore, even if a drainage hole is provided at the bottom end of the peripheral wall of the support pipe, as long as the protruding portion that receives the bottom end of the support material inserted into the support pipe is positioned so that it can receive the support material at a higher level than the drainage hole, the poured concrete or its mortar components can be prevented from hardening in contact with the support material that is located higher than the drainage hole even if the poured concrete or its mortar components enter the support pipe through the drainage hole.

In addition, the part of the support pipe protruding upward from the support pipe body is not only in contact with the poured concrete and hardened, but concrete or its mortar components that have entered the support pipe body through the drainage hole at the lower end of the support pipe body may also harden in contact with the lower end of the support pipe body. Therefore, after removing a support material such as a safety handrail, it may be difficult to use the upper end of the support pipe protruding upward from the hardened concrete layer to screw the support pipe out of the hardened concrete layer. In such a case, if a tool insertion hole (7) is provided that penetrates radially through the upper end of the support pipe (1), the support pipe can be screwed out relatively easily using an appropriate tool such as a chisel inserted into the tool insertion hole, and the support pipe can be reliably detached from the concrete or mortar that has hardened in contact with the lower end of the support pipe and easily pulled out. It is effective to provide the tool insertion holes concentrically on both diametric sides of the upper end of the support pipe.

FIG. 2 is a vertical sectional front view illustrating the device of the present invention in use. FIG. 2A is a front view of the strut support pipe, and FIG. 2B is a longitudinal sectional front view of the strut support pipe. FIG. 3 is an enlarged plan view of the strut support pipe. FIG. 4 is an enlarged bottom view of the strut support pipe. FIG. 5 is an enlarged cross-sectional view taken along line XX of FIG. 2A. FIG. 6 is an external view showing a support pipe fixed to and erected on a structural body, a support material support pipe inserted into the support pipe, and a support material of a temporary safety handrail inserted into the support material support pipe. FIG. 7 is a vertical sectional front view illustrating a state in which a support material of a temporary safety handrail is inserted into the support material support pipe whose lower half has been inserted into the support tube shown in FIG.

A preferred embodiment of the present invention will be described below with reference to the drawings. In the state of use of the device of the present invention shown in Figure 1, where the support material 11 of the temporary safety handrail is supported, a support tube 10 is installed vertically at a predetermined position on the top surface of a structure 9 such as an H-shaped steel, with its lower end fixed by welding or the like. The lower half of the support material support pipe 1 is inserted into the support tube 10, and the lower end of the support material 11 of the temporary safety handrail is inserted into this support material support pipe 1.

Explaining in more detail below, as shown in Figures 2 to 5, the pillar material support pipe 1 is a plastic pipe with a tapered shape in which the outer diameter gradually decreases towards the lower end so that the outer diameter is maximum at the upper end and minimum at the lower end. It has a pillar material support region 2 with a constant inner diameter from point A near the upper end to point B near the lower end so that the pillar material 11 can be inserted without rattling, a pillar material insertion opening 3 whose inner diameter widens upward from point A to the upper end, a gradually decreasing inner diameter portion 4 whose inner diameter from point B to the lower end becomes smaller towards the lower end, an annular protrusion 5 integrally formed at the lower end of this gradually decreasing inner diameter portion 4 so as to protrude inward, a number of notched slits 6 cut out from the lower end to a position slightly above point B and arranged at equal intervals in the circumferential direction, and a pair of tool insertion holes 7 formed concentrically at two diametrical locations near the upper end of the pillar material insertion opening 3. Therefore, in the region from point B to point A, the thickness gradually increases the closer to point A, and in the region from point A to the top of the support material insertion opening 3, the thickness gradually decreases the further away from point A. The appearance of this support material support pipe 1 is tapered, with the outer diameter gradually increasing from the bottom end to the top end, and the region from the bottom end to a position slightly above the top end of the notch slit 6, which is approximately equal to the height of the support pipe 10, is the tapered portion 1a that is inserted into the support pipe 10.

In addition, a straight pipe section 8 with a constant inner diameter is formed above the annular protrusion 5, but this straight pipe section 8 may be omitted and the inclined inner peripheral surface of the inner diameter gradually decreasing section 4, whose inner diameter gradually decreases toward the lower end, may be configured to connect to the upper end step surface 5a of the annular protrusion 5. Similarly, the outer peripheral surface of the inner diameter gradually decreasing section 4 is a tapered outer peripheral surface with an outer diameter gradually decreasing toward the lower end near the upper end of the annular protrusion 5, and is cylindrical with an outer diameter that does not change from there to the lower end of the annular protrusion 5, but the outer peripheral surface of the annular protrusion 5 may be formed as a tapered outer peripheral surface with an outer diameter gradually decreasing toward the lower end from its upper side to the lower end of the annular protrusion 5.

The support pipe 10 is a straight pipe with an inner diameter equal to the outer diameter of the support pipe 1 at a position slightly above the upper end of the notch slit 6, and its length is set to be slightly longer than the length from the lower end of the support pipe 1 to the upper end of the notch slit 6, and a drain hole 10a is cut out at an appropriate location around the lower end to prevent rainwater from accumulating inside. When the tapered portion 1a of the support pipe 1 is inserted into the support pipe 10, the lower end (lower end of the annular protruding portion 5) of the support pipe 1 abuts against the bottom of the support pipe 10 (upper surface of the structure 9) as shown in Figure 7, and the outer surface of the support pipe 1 is pressed against the inner surface of the upper end of the support pipe 10 at a position slightly above the upper end of the notch slit 6, and the support pipe 1 is held by the support pipe 10.

Once the support pipe 1 is set on the support tube 10 as described above, the support 11 of the temporary safety handrail is inserted into the support pipe 1. The support 11 is made of a steel pipe with an outer diameter equal to or slightly smaller than the inner diameter of the support area 2 of the support pipe 1. When the lower end of the support 11 inserted into the support pipe 1 enters the area of the tapered inner diameter portion 4 of the support pipe 1, the resistance to insertion of the support 11 increases. If the support 11 is strongly pressed into the support pipe 1 to overcome this resistance, the tapered inner diameter portion 4 is notched and the slit 6 is widened while pushing open, and the support 11 can be inserted into the support pipe 1 to a position where the lower end of the support 11 is received by the upper end step surface 5a of the annular protruding portion 5 at the lower end. As a result, as shown in FIG. 1, the outer peripheral surface of the lower end of the tapered portion 1a, which has expanded to its maximum diameter, comes into contact with the inner peripheral surface of the lower end of the support pipe 10, and the outer peripheral surface of the upper end of the tapered portion 1a of the support pipe 1 is pressed against the inner peripheral surface of the upper end of the support pipe 10, so that the outer peripheral surface of the support pipe 1 comes into contact with at least the inner peripheral surfaces of both the upper and lower ends of the support pipe 10, and the support pipe 10 is held in an upright position concentric with the support pipe 10, and by extension the support pipe 11 of the temporary safety handrail is also held in an upright position concentric with the support pipe 10.

Once the temporary safety handrail has been supported as described above, as shown in Figure 1, concrete can be poured and cured up to the midpoint between the top of the support pipe 1 and the top of the support tube 10 to build a poured concrete layer 12. At this time, it is possible that concrete or its mortar components will enter the support tube 10 through the drainage hole 10a at the bottom end of the support tube 10 and come into contact with the bottom end of the support pipe 1 and harden, but since at least the support 11 of the temporary safety handrail is supported on the top step surface 5a of the annular projection 5, by positioning the top step surface 5a of the annular projection 5 higher than the drainage hole 10a, the risk of concrete or its mortar components adhering to and hardening on the support 11 of the temporary safety handrail can be avoided.

When the work is completed and the temporary safety handrail needs to be removed, the support material 11 of the temporary safety handrail can be removed together with the support material 11 simply by pulling it out of the support material support pipe 1. After this, the support material support pipe 1 buried in the poured concrete layer 12 can be removed, but since the concrete that makes up the poured concrete layer 12 is in direct contact with the support material support pipe 1 and has hardened, it is expected that it will not be easy to remove the support material support pipe 1. In such a case, a suitable tool such as a chisel can be inserted into the tool insertion hole 7 at the upper end of the support material support pipe 1 protruding upward from the poured concrete layer 12, and this tool can be used to apply a rotational force to the support material support pipe 1 to promote its removal from the poured concrete layer 12. After this, the cylindrical space connected to the inside of the support tube 10, which is left after the support material support pipe 1 is removed, can be filled with mortar to seal it.

In the above embodiment, the protruding portion 5 that receives the lower end of the support material 11 on the upper end step surface 5a is configured in an annular shape, and this annular protruding portion 5 is divided in the circumferential direction by the notch slits 6, but the protruding portion 5 can be provided in a protruding shape at an appropriate location between the notch slits 6. Furthermore, it is possible to use the device of the present invention in a manner different from that described above. For example, the support material support pipe 1 can be inserted into the support material 11 of the temporary safety handrail from its lower end until the lower end of the support material 11 abuts against the upper end step surface 5a of the protruding portion 5 at its lower end, and the inner diameter gradually decreasing portion 4 of the support material support pipe 1 can be pressed against the peripheral surface of the support material 11 to hold the support material support pipe 1 at the lower end of the support material 11. In this state, the support material support pipe 1 can be inserted into the support tube 10 together with the support material 11. In this case, the tapered portion 1a, which has been expanded so that its outer diameter is nearly equal to the inner diameter of the support tube 10, must be inserted into the support tube 10, so it is possible to add some measure to make it easier to insert the tapered portion 1a into the support tube 10, such as by cutting the lower corner of the outer circumferential surface of the tapered portion 1a at an angle.

The support material mounting device of the present invention can be used as a means of supporting support materials such as safety handrails that are temporarily installed on structures under construction.

REFERENCE SIGNS LIST 1 Support pipe for support member 1a Tapered portion 2 Support region for support member 3 Opening for inserting support member 4 Gradually decreasing inner diameter portion 5 Annular protruding portion 5a Upper end step surface 6 Notched slit 7 Tool insertion hole 8 Straight pipe portion 9 Structural body such as H-shaped steel 10 Support pipe body 10a Drain hole 11 Support member for temporary handrail 12 Cast concrete layer

Claims (2)

A mounting device for a support material such as a safety handrail, comprising a support pipe body fixed to a structure and whose entire length is buried in a poured concrete layer, and a support material support pipe inserted into the support pipe body and protruding above the poured concrete layer, the support material such as a safety handrail being inserted into and held in the support material support pipe,
The support tube is a straight tube having a uniform diameter from its upper end to its lower end, and the support pipe is provided with a tapered portion which is inserted into the support tube and whose lower end abuts against the bottom of the support tube, and is configured so that when the tapered portion is inserted into the bottom of the support tube, the outer circumferential surface of the tapered portion is pressed against the inner circumferential surface of the upper end of the support tube, and the tapered portion of the support pipe is provided with an inner diameter tapering portion whose inner diameter becomes smaller toward the lower end, and the lower end of the inner diameter tapering portion is provided with a tapered portion which is pressed against the support pipe inserted into the support pipe. a support pipe having an inward protruding portion that receives the lower end of a support material, and further having a plurality of circumferentially tapered inner diameter slits extending upward from the lower end thereof, such that a support material inserted into the support pipe causes the inner diameter tapering portion to expand in diameter as the slits widen, and when the support material is inserted into the support pipe to a depth where it can be received by the protruding portion, the lower end of the support pipe expanded in diameter by the support material abuts against the inner surface of the lower end of the support tube. 2. The strut support pipe according to claim 1, wherein an upper end of the strut support pipe is provided with a tool insertion hole extending radially therethrough.

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