KR102024717B1 - Safety fence and pole for the same - Google Patents

Abstract

The present invention relates to a safety handrail enabling a support rod to freely rotate on a pole at a fixed angle. The safety handrail includes: a first pole vertically installed on a support surface; a second pole installed on the support surface to be parallel with the first pole on one side of the first pole; and multiple horizontal bars installed at fixed intervals between the first pole and the second pole. The first pole and the second pole include a hanging groove of a round cross section formed in the longitudinal direction on sides facing each other. A round hanging protrusion corresponding to the hanging groove is installed at both ends of each of the multiple horizontal bars. The hanging protrusion at one end of each of the multiple horizontal bars is inserted into the hanging groove of the first pole, and the hanging protrusion at the other end of each of the multiple horizontal bars is inserted into the hanging groove of the second pole. The multiple horizontal bars are installed between the first pole and the second pole.

Description

Safety fence and pole for the same}

The present invention relates to a safety railing, and more particularly, to a safety railing that can adjust the installation angle of the horizontal bar and a safety railing used for it.

In general, roadsides are divided between sidewalks and driveways, and safety railings are provided to protect passengers.

Safety railings may also be installed to prevent unauthorized crossings and to mark child protection areas. Alternatively, safety railings may be installed to replace fences in construction areas or buildings.

In addition, safety railings may be installed on the veranda of a house or apartment for safety. Alternatively, guardrails can be installed on the roof of the building to prevent people from falling. In this way, the safety railing may be installed in various places depending on the use.

There are various prior arts for such safety railings.

As an example, there is a Korean Patent No. 10-1571365 (the name of the invention: a safety fence in which the angle of the horizontal bar is adjusted) patented by the present inventor.

In the prior art, the horizontal bar can be adjusted at an angle in the vertical direction with respect to the support, but cannot adjust the angle of the horizontal bar in the front and rear directions with respect to the support.

Therefore, there is a problem that it is difficult to install the safety fence according to the prior art to fit the various boundary forms of the region to be installed.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a safety railing capable of freely adjusting the angle of the horizontal bar within a predetermined angle range in the forward direction with respect to the prop.

In addition, another object of the present invention is to provide a guardrail for the safety rail used in the safety railing that can adjust the angle of the horizontal bar.

The problem of the present invention as described above,

A first column perpendicular to the support surface;

A second column installed on the support surface in parallel with the first column to one side of the first column; And

And a plurality of horizontal bars installed at predetermined intervals between the first holding and the second holding.

The first holding and the second holding each has a locking groove of a circular cross section formed in the longitudinal direction on the surface facing each other,

Both ends of each of the plurality of horizontal bars are provided with a spherical locking projection corresponding to the locking groove,

When the locking protrusion of one end of each of the plurality of horizontal bars is inserted into the locking groove of the first column, and the locking protrusions of the other end of each of the plurality of horizontal bars are inserted into the locking groove of the second column, the plurality of horizontal bars are formed in the first groove. It can be achieved by providing a safety handrail, characterized in that installed between the first holding and the second holding.

In this case, each of the locking projections of the plurality of horizontal bars may include an insertion opening inserted into the locking groove and a connecting rod extending from the insertion opening and having a width smaller than the diameter of the insertion opening and connected to one end of the horizontal bar.

In addition, the locking groove is inserted into the connecting rod of the locking projection, and has an inlet portion having a width smaller than the diameter of the locking groove, the inlet portion may be formed to be inclined in the form of diverging toward the outside.

In addition, the locking projection may be detachably installed at both ends of the horizontal bar.

According to another aspect of the present invention, the object of the present invention,

A center member formed in an H shape; And

And a pair of wing members formed to have the same length as the center member and detachably coupled to both sides of the center member in the longitudinal direction.

The center member is provided with coupling grooves at both ends of the flange on both sides,

Each of the pair of wing members can be achieved by a guardrail for safety, characterized in that it has a coupling protrusion coupled to the coupling groove provided on both side flanges of the core material.

At this time, the outer circumferential surface of the pair of wing members, when the pair of wing members are coupled to the central member, the cross section of the central member and the pair of wing members coupled to form a circular or rectangular shape can be formed. have.

Safety railing according to an embodiment of the present invention having the structure as described above, because the horizontal bar can be rotated freely in a certain angle range with respect to the strut, the boundary between which the guardrail is installed to form a complex bent shape. Even if it is easy to install.

In addition, the safety rail according to an embodiment of the present invention has the advantage that it can be easily installed even where the height of the support surface changes.

Therefore, the safety railing according to an embodiment of the present invention, since the horizontal bar installed on the support can be rotated at an angle in the vertical, horizontal, and inclined directions with respect to the support, bent in the horizontal direction, bent in the vertical direction, Easy installation even when bent over both horizontal directions.

1 is a perspective view showing a safety rail according to an embodiment of the present invention;
2 is a partially exploded perspective view of the safety rail of FIG.
3 is a cross-sectional view of the column used in the safety railing of FIG.
4 is a cross-sectional view of the post installed on the outermost side of the safety rail of FIG.
5 is a partially separated perspective view of the horizontal bar of FIG. 2;
Figure 6 is a cross-sectional view showing a state in which the engaging projection of the horizontal bar coupled to the locking groove of the strut of the safety railing of Figure 1;
7 is a cross-sectional view showing another example of a strut which can be used in a safety rail according to an embodiment of the present invention;
8 is a view showing an example in which a safety rail is installed according to an embodiment of the present invention;
9 is a view showing another example in which the safety railing according to an embodiment of the present invention is installed;
10 is a cross-sectional view showing another example of the guardrail for safety according to an embodiment of the present invention;
11 is a cross-sectional view showing another example of the guardrail for safety rail according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail embodiments of the safety railing and the guardrail for safety according to the present invention.

Embodiments described below are shown by way of example in order to help understanding of the present invention, it should be understood that the present invention can be implemented in various modifications different from the embodiments described herein. However, in the following description of the present invention, if it is determined that the detailed description of the related known functions or components may unnecessarily obscure the subject matter of the present invention, the detailed description and specific illustration thereof will be omitted. In addition, the accompanying drawings may be exaggerated in some of the dimensions of the components rather than being drawn to scale to facilitate understanding of the invention.

1 is a perspective view showing a safety rail according to an embodiment of the present invention. 2 is a partially exploded perspective view of the safety railing of FIG. 1. 3 is a cross-sectional view of the struts used in the safety railing of FIG. Figure 4 is a cross-sectional view of the post is installed on the outermost side of the safety rail. 5 is a partially separated perspective view of the horizontal bar of FIG. 2. 6 is a cross-sectional view showing a state where the locking projection of the horizontal bar is coupled to the locking groove of the strut of the safety railing of FIG.

1 to 6, the safety railing 1 according to an embodiment of the present invention includes a horizontal bar 30 installed between the plurality of pillars 10 and 20 and the plurality of pillars 10 and 20. It may include. In FIG. 1, only two props, namely, the first holding 10 and the second holding 20 are shown for convenience of description and illustration.

The first column 10 is installed approximately perpendicular to the support surface 3 where the safety railing 1 is installed. For example, when installing the safety railing 1 on the road adjacent to the sidewalk, the first column 10 is installed to a predetermined depth on the upper surface of the road. As another example, when the safety railing 1 is installed on the ground, the first column 10 is installed at a predetermined depth on the ground. In the following description, a place where a plurality of struts 10 and 20, such as the first column 10, are provided to a predetermined depth is referred to as the support surface 3.

The first holding 10 has a locking groove 125 in the longitudinal direction on both sides. That is, the locking groove 125 is formed inside the first column 10 in the longitudinal direction of the first column 10. The locking groove 125 is formed in a circular cross section and includes an inlet 126 that communicates with the outside of the first column 10. Since the width of the inlet 126 is formed to be smaller than the diameter (D) of the locking groove 125, the locking projection 32 when the locking projection 32 of the horizontal bar 30 is inserted into the locking groove 125 Will not fall out of the locking groove (125).

The first column 10 according to an embodiment of the present invention may be formed in a separate type as shown in FIG. Specifically, the first support 10 is a pair of wing member 12 which is slide-bonded in the longitudinal direction of the central member 11 on both sides of the central member 11 and the central member 11 formed in an H shape. Can be configured.

The core member 11 is formed in a substantially H-shaped steel shape and includes a web 111 and two flanges 112. Two coupling grooves 113 are provided on the inner surface of the two flanges 112 facing each other of the core member 11 in the longitudinal direction of the first column 10. Specifically, as shown in FIG. 3, two coupling grooves 113 are provided on the inner surface of the first flange 112 so as to be symmetrical about the web 111 of the central member 11. In addition, two coupling grooves 113 are provided on the inner surface of the second flange 112 so as to be symmetrical about the web 111 of the central member 11. Accordingly, coupling grooves 113 are provided at both ends of the two flanges 112 of the central member 11.

The pair of wing members 12 detachably coupled to both sides of the central member 11 are formed in the same shape.

The wing member 12 may have a length substantially equal to that of the center member 11, and may include a coupling surface 121 coupled to the center member 11 and a cover surface 122 forming an outer surface thereof. Both ends of the coupling surface 121 is provided with a coupling protrusion 123 to be inserted into the coupling groove 113 of the central member 11, the locking groove 125 of the circular cross section is formed in the center. The locking groove 125 is formed in a shape protruding from the engaging surface 121. Therefore, when the wing member 12 is coupled to the central member 11, the protruding portion of the locking groove 125 is adjacent to or in contact with the web 111 of the central member 11.

2 and 3, the locking groove 125 of the wing member 12 includes an inlet 126 that communicates with the outer surface of the cover 122. The width of the inlet 126 is formed smaller than the diameter (D) of the locking groove (125). Therefore, when the locking protrusion 32 of the horizontal bar 30 is inserted into the locking groove 125 of the first column 10, the horizontal bar 30 does not fall out of the locking groove 125.

The inlet portion 126 of the locking groove 125 may be formed to be parallel to both sides facing each other, in the case of this embodiment was formed to be inclined both sides (126a) of the inlet portion 126 of the coupling groove (125). Specifically, both side surfaces 126a of the inlet portion 126 of the locking groove 125 is formed to be inclined in the form of diverging toward the outside of the first column 10. Thus, the inner width w1 of the inlet portion 126 is narrower than the outer width w2.

When both side surfaces 126a of the inlet portion 126 of the locking groove 125 are formed to be inclined, the horizontal bar 30 may pivot at an angle with respect to the first column 10. That is, the other end of the horizontal bar 30 not inserted into the locking groove 125 may be located on the left or right side (or front and rear) with respect to the first support 10 within a predetermined angle range. An angle at which the horizontal bar 30 can be turned left or right at an inclination angle of both side surfaces 126a of the inlet 126 of the locking groove 125 can be adjusted.

The second support 20 may be installed on the support surface 3 in parallel with the first support 10 toward one side of the first support 10. 2 and 4, the second support 20 is two wing members 22 detachably coupled to both side surfaces of the center member 21 and the center member 21 in the same manner as the first support 10. , 23).

The core member 21 is formed in a substantially H shape and includes a web 211 and two flanges 212. Since the center member 21 is formed in the same manner as the center member 11 of the first column 10 described above, a detailed description thereof will be omitted.

The two wing members 22 and 23 of the second column 20 are formed in different structures. The wing member 22 on the right side facing the first column 10 and to which the horizontal bar 30 is connected may be formed to be the same as or similar to the wing member 12 of the first column 10 described above. As another example, in the second column 20 illustrated in FIG. 4, both side surfaces 226a of the inlet 226 of the locking groove 225 of the wing member 22 may be formed in parallel with each other.

The wing member 23 on the left side of the second column 20 to which the horizontal bar 30 is not connected does not have the locking groove 225. Therefore, the inlet part is not provided in the cover surface 232 of the left wing member 23.

However, as another example, when the horizontal bar 30 is connected to the left side of the second support 20, the second support 20 may be formed in the same manner as the first support 10.

In the above description, the first column 10 and the second column 20 are formed to have a substantially circular cross section. Thus, the cover portions 122, 222, 232 of the wing members 12, 22, 23 are formed in an arc shape. However, the cross-sectional shape of the first column 10 and the second column 20 is not limited thereto.

As shown in FIG. 7, the post (including the first and second supports) 10 ′ may be formed to have a substantially rectangular cross section. Specifically, the outer circumferential surface of the wing member 12 ′ in which the locking groove 125 is formed, that is, the cover surface 122 ′ of the wing member 12 ′ is formed in a plane to center the two wing members 12 ′. When coupled to the member 11, the cross section of the support 10 ′ formed of the central member 11 and the pair of wing members 12 ′ may have a substantially rectangular shape.

Again, referring to FIGS. 1 and 2, the horizontal bar 30 is installed between the first column 10 and the second column 20.

Both ends of the horizontal bar 30 are provided with a spherical locking projection 32 corresponding to the locking groove 125 of the first holding 10 and the second holding (20). As shown in FIG. 5, the locking protrusion 32 includes a spherical insertion hole 321 and a connecting rod 322 extending from the insertion hole 321 and coupled to one end of the horizontal bar 30.

The insertion hole 321 of the locking protrusion 32 may be inserted into the locking grooves 125 and 225 of the first holding 10 or the second holding 20. The diameter d of the insertion opening 321 may be the locking grooves 125 and 225. It is formed smaller than the diameter (D). In addition, the connecting rod 322 provided between the insertion hole 321 and one end of the horizontal bar 30 may be formed in a circular cross section. The connecting rod 322 is formed to be inserted into the inlets 126 and 226 of the locking grooves 125 and 225 of the first holding 10 or the second holding 20. Accordingly, the diameter d1 of the connecting rod 322 is smaller than the diameter d of the insertion hole 321 and smaller than the widths w1 and w2 of the inlets 126 and 226 of the locking grooves 125 and 225. Specifically, the diameter of the connecting rod 322 is formed smaller than the inner width (w1) of the inlet 126.

However, the cross section of the connecting rod 322 is not limited to a circle. If necessary, the cross section of the connecting rod 322 may be formed in a polygon, such as a rectangle, a rectangle, or an ellipse.

The locking protrusion 32 may be detachably installed at one end of the horizontal bar 30. That is, as shown in Figure 5, one end of the engaging projection 32 may be provided with a coupling portion 323 that can be inserted into one end of the horizontal bar (30).

The coupling part 323 may include an insertion part 323a that can be inserted into one end of the horizontal bar 30 having a circular cross section, and a stopper 323b that restricts the insertion of the insertion part 323a. The stopper 323b has a larger diameter than the insertion portion 323a and may be formed to have the same diameter as the outer diameter of the horizontal bar 30. In the case of FIG. 5, since the horizontal bar 30 is formed of a pipe having a circular cross section, the coupling part 323 is formed in a cylindrical shape, but the shape of the coupling part 323 is not limited thereto. Coupling portion 323 may be formed in a cross section corresponding to the cross-sectional shape of the horizontal bar (30). For example, when the horizontal bar 30 is formed of a square pipe, the coupling part 323 may have a square cross section.

As another example, although not shown, the locking protrusion 32 may be integrally formed with the horizontal bar 30.

The locking protrusion 32 of the first end of the horizontal bar 30 having the structure as described above of the locking groove 125 of the first column 10, specifically of the wing member 12 of the left side of the first column 10 Inserted into the locking groove 125 and the locking projection 32 of the other end of the horizontal bar 30, the locking groove 225 of the second column 20, specifically the wing member 22 of the right side of the second column 20 When inserted into the locking groove 225, the horizontal bar 30 is installed between the first holding 10 and the second holding 20 so as not to fall out of the first holding 10 and the second holding 20. .

Meanwhile, a plurality of horizontal bars 30 may be installed at regular intervals between the first holding 10 and the second holding 20. In the case of the safety railing 1 of FIG. 1, three horizontal bars 30 are installed between the first holding 10 and the second holding 20, but this is only an example, and the number of horizontal bars 30 is shown. Is not limited thereto.

Spacer members 40 are installed between the horizontal bars 30 in order to install the plurality of horizontal bars 30 between the first and second supports 10 and 20. Specifically, the spacer member 40 is inserted into the locking grooves 125 and 225 of the first holding 10 and the second holding 20 to support the locking protrusion 32 of the horizontal bar 30 so as to support the horizontal bar 30. It is formed to fix the position of.

The spacing member 40 may be formed of a circular pipe or a circular rod having a diameter smaller than the diameter D of the engaging grooves 125 and 225 of the first and second supports 10 and 20. The distance between the two horizontal bars 30 may be determined by the length of the spacer member 40.

In addition, the spacer member 40 may further include an upper spacer member 41 supporting the horizontal bar 30 at the upper end and a lower spacer member (not shown) supporting the horizontal bar 30 at the lower end.

For example, as shown in Figure 2, the upper horizontal bar 30 is the upper spacer member 41, the upper horizontal bar 30 and the second horizontal bar 30 is installed on the bottom of the cover 50 Position may be fixed by the gap member 40 is installed between.

As another example, the upper spacer member 41 may be integrally formed with the cover 50.

The cover 50 is to close the upper ends of the first column 10 and the second column 20, it is fixed to the upper end of the first column 10 and the second column (20). The cover 50 may be fixed to the upper ends of the first holding 10 and the second holding 20 in various ways. For example, the cover 50 may be fixed to the upper end of the first column 10 and the second column 20 by a hook method, a screw fastening method, a fitting method or the like.

Safety railing 1 according to an embodiment of the present invention having the structure as described above, when the engaging projection 32 of the horizontal bar 30 is inserted into the locking grooves (125, 225) of the support (10, 20), horizontal bar It is possible to pivot the angle 30 relative to the struts 10 and 20.

For example, referring to FIG. 6, when the coupling protrusion 32 of the horizontal bar 30 is inserted into the locking groove 125 of the support 10, the horizontal bar 30 is an entrance of the locking groove 125. By the width w1 of the part 126, it can turn back and forth (arrow A) with respect to the support | pillar 10 within a predetermined angle range. In addition, since the inlet 126 of the locking groove 125 is formed long in the longitudinal direction of the support 10, the horizontal bar 30 is a predetermined angle in the vertical direction (direction perpendicular to the drawing) with respect to the support 10. You can turn within range. Therefore, the horizontal bar 30 may freely rotate within a predetermined angle range with respect to the support 10 about the locking protrusion 32 inserted into the locking groove 125 of the support 10.

Therefore, even when the plurality of struts 10 are not disposed in a straight line, the struts 10 and the horizontal bar 30 according to the exemplary embodiment of the present invention can be easily installed.

For example, as illustrated in FIG. 8, the safety rail 400 may be easily installed in a bent form on the support surface 3 (X-Y plane in FIG. 8). 8 is a view showing an example in which a safety rail according to an embodiment of the present invention having four struts is installed.

As shown in FIG. 8, the first column 411 is installed on the support surface 3, and the second column 412 is spaced apart from the first column 411 by a predetermined distance and is installed at a bent portion. Subsequently, the third column 413 is spaced apart from the second column 412 by a predetermined distance and is installed at a place where it is bent again. The fourth column 414 is installed at a spaced distance from the third column 413.

Thereafter, a plurality of first horizontal bars 431 are disposed between the first and second supports 411 and 412, and a plurality of second bars are disposed between the second and third supports 412 and 413. Install the horizontal bar (432). In addition, a plurality of third horizontal bars 433 are provided between the third holding portion 413 and the fourth holding portion 414. The plurality of first horizontal bars 431, the second horizontal bars 432, and the third horizontal bars 433 may include a first support 411, a second support 412, a third support 413, and a fourth support bar 433. It can be easily installed by inserting a locking projection into the locking groove of the support 414.

In this case, the second horizontal bar 432 is inclined at a first angle θ1 with respect to the first horizontal bar 431 in the horizontal direction (X direction), and the second angle with respect to the third horizontal bar 433. It is in a state inclined at (θ2). The first angle θ1 and the second angle θ2 are different in size. As described above, the safety railing 400 according to the exemplary embodiment of the present invention has a bending angle between the first horizontal bar 431 and the third horizontal bar 433 installed at both sides of the second horizontal bar 432 (the second horizontal road). Even if the angle of the bar 432) is different, there is an advantage that it can be easily installed without using other components or deforming the horizontal bar 432.

In addition, even if the safety rail 400 according to an embodiment of the present invention is the same angle of bending of the first horizontal bar 431 and the third horizontal bar 432 installed on both sides of the second horizontal bar 432. Of course it can be used.

On the other hand, the safety railing according to an embodiment of the present invention can be easily installed even where the height of the support surface (3) changes.

For example, as shown in FIG. 9, the guardrail 500 may be provided on the support surface 3 having the inclined portion 3-1. 9 is a view showing a case where the safety railing according to an embodiment of the present invention having four posts is installed on a support surface having an inclined portion.

As shown in FIG. 9, the first support 511 is installed on the flat support surface 3, and the second support 512 is spaced a predetermined distance from the first support 511, and the inclined portion 3-1 is provided. Install at the beginning of). Subsequently, the third column 513 is spaced apart from the second column 512 by a predetermined distance, and is installed where the inclined portion 3-1 is bent again. The fourth column 514 is installed on the support surface 3 spaced apart from the third column 513 by a predetermined distance.

Thereafter, a plurality of first horizontal bars 531 are installed between the first and second supports 511 and 512, and a plurality of second bars are disposed between the second and third supports 512 and 513. The horizontal bar 532 is installed. In addition, a plurality of third horizontal bars 533 are provided between the third and fourth supports 533. The plurality of first horizontal bar 531, the second horizontal bar 532, and the third horizontal bar 533 may include the first support 511, the second support 512, the third support 513, and the fourth support bar 533. It can be easily installed by inserting a locking projection into the locking groove of the support 514.

In this case, the second horizontal bar 532 is inclined at the first angle α1 with respect to the first horizontal bar 531 in the vertical direction (Z direction), and the second angle with respect to the third horizontal bar 533. It is in a state inclined to (α2). The first angle α1 and the second angle α2 are different in size. As described above, the safety railing 500 according to the exemplary embodiment of the present invention has a bending angle (vertical direction) between the first horizontal bar 531 and the third horizontal bar 533 installed on both sides of the second horizontal bar 532. Even when the second horizontal bar 532 is different from each other, there is an advantage in that it can be easily installed without using another component or modifying the horizontal bar 532.

In addition, the safety railing 500 according to an embodiment of the present invention even when the angles of the first horizontal bar 531 and the third horizontal bar 533 installed on both sides of the second horizontal bar 532 are the same. Of course it can be used.

As described above, the safety railing according to an embodiment of the present invention may be rotated at a predetermined angle in the vertical, horizontal, and inclined directions with respect to the post, so that the horizontal rail installed at the post may be bent horizontally or vertically. The advantage is that it is easy to install safety rails to bend in both the vertical and horizontal directions.

Since the support 10 of the safety railing 1 according to the embodiment of the present invention is composed of two wing members 12 that can be separated from the center member 11, the two wing members 12 have different shapes. If it is replaced with a wing member, it can be used as a prop for other purposes.

10 and 11 are cross-sectional views showing another example of the guardrail for safety rail according to an embodiment of the present invention.

Referring to Figure 10, the strut 60 according to an embodiment of the present invention is composed of two wing members 62 without a coupling groove in one central member 61. At this time, the center material 61 can use the same thing as the center material 11 of the support | pillar 10 by the above-mentioned embodiment. Such a strut 60 can be used in the case of installing a horizontal bar 30 having no engaging projection. Alternatively, the post 60 may be used for other purposes than the safety railing 1.

10 shows a case in which the cross section in which the central member 61 and the two wing members 62 are coupled is approximately circular, but is not limited thereto. As another example, a cross section in which the center member 71 and the two wing members 72 of the support 70 are coupled may be formed to have a substantially rectangular shape as shown in FIG. 11. At this time, the center material 71 can use the same thing as the center material 11 of the support | pillar 10 by the above-mentioned embodiment.

In the above, the present invention has been described by way of example. The terminology used herein is for the purpose of description and should not be regarded as limiting. Various modifications and variations of the present invention can be made in accordance with the above teachings. Accordingly, unless otherwise stated, the invention may be practiced freely within the scope of the claims.

1,400,500; Safety railing 3; Support surface
10,20,60,70,411,412,413,414,511,512,513,514; landlord
11,21; Intermediate member 12,22; Wing member
30,431,432,433,531,532,533; Horizontal bar
32; Obstacle 40; Spacer
50; Cover 113; Combined groove
123; Coupling protrusion 125,225; Home
126,226; Inlet 321; parenthesis
322; Connecting rod 323; Coupling

Claims (6)

In props used for safety railings,
A center member formed in an H shape; And
And a pair of wing members formed to have the same length as the center member and detachably coupled to both sides of the web of the center member in the longitudinal direction.
The central member is formed with coupling grooves at both ends of both flanges,
Each of the pair of wing members includes coupling protrusions coupled to the coupling grooves provided at both flanges of the core member.
At least one of the pair of wing members includes a locking groove of a circular cross section formed over the entire length in the longitudinal direction on the outer peripheral surface,
When the coupling protrusion of the pair of wing members is coupled to the coupling groove of the core member, the pair of wing members are facing each other with the web of the core member therebetween. The method of claim 1,
The outer circumferential surface of the pair of wing members is characterized in that when the pair of wing members are coupled to the center member, the cross-sections of the center member and the pair of wing members joined form a circular or rectangular shape. Safety railing holding.
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