Guard fence division column

Abstract

To provide a guard fence division column which can freely select a connection position of the division column and can achieve both increased bending yield strength and improved toughness of the division column.SOLUTION: A guard fence division column comprises a filled steel pipe lower column 10A and a filled steel pipe upper column 10B. The lower column 10A and the upper column 10B have multiple reinforcement bars 12a, 12b buried into filled materials 14a, 14b in an outer pipe 11, connect flanges 16, 16 formed at one end of the lower column 10A and the upper column 10B using multiple bolt elements to form a flange joint, the reinforcement bar 12a of the lower column 10A and the reinforcement bar 12b of the upper column 10B are superimposed in the outer pipe of the lower column 10A or the upper column 10B and arranged cylindrically, and a group of the reinforcements 12a, 12b arranged cylindrically is positioned by a connection filled material 14c filled in the outer pipe 11 of the lower column 10A or the upper column 10B to form a reinforcement connection part 20.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a post for a protective fence that captures falling objects such as falling rocks, earth and sand, and avalanches, and in particular to a split post that is composed of a plurality of split posts. [Background technology]

[0002] Generally, a safety fence comprises a number of posts and a safety net attached between adjacent posts, and the impact force acting on the safety net is ultimately supported by the strength of the posts. Hollow steel pipes and H-shaped steel beams are generally used for the posts, but for protective fences where high strength is required, posts made of concrete-filled steel pipes are used.

[0003] Since the posts are relatively long and heavy, split posts are used in sites where vehicle transportation is difficult or where the site where the protective fence is to be installed is narrow. Patent Document 1 discloses a split support pillar in which the support pillar is divided into two parts, upper and lower, to form a lower support pillar and an upper support pillar.

[0004] A conventional split-type support pole 50 will be described with reference to FIG. The split support 50 comprises a lower support part 51 and an upper support part 52 . Each lower part 51 and upper part 52 of the pillars are made of filled steel pipes, and a plurality of reinforcing bars 54 are arranged inside the steel pipes 53, and the pipes are filled with a filling material 55 such as concrete or mortar. An annular flange 56 is provided at the end of each steel pipe 53 so as to protrude in the radial direction. The lower pillar portion 51 and the upper pillar portion 52 are transported to the site in a divided form, and then the flanges 56, 56 are butted together and connected with a plurality of bolt elements 57 to assemble into a single pillar 50. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2004-162486 A Summary of the Invention [Problem to be solved by the invention]

[0006] The conventional split-type support 50 has the following points that need to be improved. <1> In the split support 50, the reinforcing bars 54 are separated between the lower support part 51 and the upper support part 52, so the connecting part becomes a plastic hinge, which is a weak point in terms of strength. Therefore, the split support pillar 50 has a lower bending strength than a single, unsplit support pillar. <2> If the bolt element 57 of the split support 50 breaks, the support 50 will break at the connection point, instantly losing its support function. <3> In order to increase the strength of the connection, measures have been taken such as increasing the number of bolt elements 57 and providing multiple reinforcing ribs 58 between the flange 56 and the steel pipe 53, but these measures incur high reinforcement costs. <4> The connection position between the lower column 51 and the upper column 52 is limited to an upper position of the above-ground part of the column 50 where the bending moment is small, and the connection position between the lower column 51 and the upper column 52 cannot be freely selected.

[0007] An object of the present invention is to provide a split support post for a safety fence that can solve the above problems. [Means for solving the problem]

[0008] The present invention is a split support for a protective fence made of filled steel pipes, which consists of a lower support made of filled steel pipes with its lower part buried in a support surface and erected, and an upper support made of filled steel pipes arranged coaxially with and connected to the lower support, in which the lower support and upper support have multiple reinforcing bars embedded in the filling material inside the outer tube, and flanges formed at one end of the lower support and upper support arranged coaxially are connected with multiple bolt elements to form a flange joint, and the reinforcing bars of the lower support and the upper support are overlapped and arranged in a tubular shape inside the outer tube of either the lower support or the upper support, and a reinforcing connection part is formed by positioning the group of reinforcing bars arranged in a tubular shape overlapping inside the outer tube of either the lower support or the upper support with connecting filler filled in the outer tube of either the lower support or the upper support. In another form of the present invention, the lower support includes a plurality of first reinforcing bars arranged within an outer tube, and the upper support includes a plurality of second reinforcing bars arranged within an outer tube, and either the first reinforcing bars or the second reinforcing bars have a length that exceeds the overall length of the lower support or the upper support. In another form of the present invention, the second reinforcing bar protrudes from the end face of the upper support and forms a connecting space at the upper part of the lower support, and the first reinforcing bar and the second reinforcing bar are arranged in a tubular shape by overlapping each other within the connecting space. In another form of the present invention, the first reinforcing bar protrudes from the end face of the lower support and forms a connecting space at the lower part of the upper support, and the first reinforcing bar and the second reinforcing bar are arranged in a tubular shape by overlapping each other within the connecting space. In another embodiment of the present invention, the first reinforcing bars and the second reinforcing bars arranged inside the outer pipe are arranged at the same radius from the center of the outer pipe and at equal intervals. In another embodiment of the present invention, the diameter of the second reinforcing bar of the upper column is smaller than the diameter of the first reinforcing bar of the lower column. In another form of the present invention, a plurality of inner tubes made of metal and having a circular cross section may be arranged along the axial direction in the center of the outer tube, and the plurality of inner tubes may be positioned by a filler material filled in the outer tube, so that the inner tubes deform into a flattened shape when a bending moment is generated. Effect of the Invention

[0009] The present invention has at least one of the following advantages. <1> The split support column of the present invention has a structure in which the bending force acting on the split support column is distributed and supported by the flange joints and the reinforcing connection parts. Therefore, since the flange joint does not become a weak point in terms of strength, the connection position of the split support can be freely selected in the above-ground part that protrudes above ground. <2> In the split support column of the present invention, the reinforcing connection parts resist large bending forces, so that even if all of the bolt elements break, the bending strength of the split support column can effectively be prevented from decreasing suddenly. Therefore, the support function can be maintained even after the bolt element breaks. <3> The reinforcing connection portion supports the bending force acting on the split support column, thereby reducing the load on the flange joint. Therefore, the number of bolt elements used in the flange joint can be reduced, and there is no need to install additional reinforcing ribs between the flange and the outer pipe. <4> Not only the outer tube in the reinforcing connection portion, but also a plurality of elements such as a plurality of reinforcing bars arranged in a cylindrical shape inside the outer tube function as restraining members for the connecting filler. This increases the restraining effect of the connecting filler, increasing the bending strength of the reinforcing connecting portion. <5> By placing reinforcing bars across the lower and upper columns, the entire split column can support bending forces. <6> By forming a reinforcing connection section at the connection between the lower support and the upper support, the bending strength of the split support is improved while at the same time, toughness is significantly improved. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is an explanatory diagram of a split support according to a first embodiment of the present invention, with a portion omitted. [Diagram 2] Illustration of the lower support with part broken off [Diagram 3] Cross-sectional view taken along line III-III in FIG. [Figure 4] Cross-sectional view taken along line IV-IV in FIG. [Diagram 5]Illustration of the upper support with a part broken off [Figure 6] Cross-sectional view of VI-VI in Figure 2 [Figure 7] Diagram of how to assemble the split support [Figure 8] Diagram of how to assemble the split support [Figure 9] Cross-sectional views of the lower strut shown in Figure 8, (A) is a cross-sectional view of the lower strut before filling with filler material, and (B) is a cross-sectional view of the lower strut after filling with filler material. [Figure 10] FIG. 1 is an explanatory diagram of a split-type support pillar on which the present invention is based; (A) is a model diagram of a split-type support pillar before connection, and (B) is a model diagram of a split-type support pillar before and after connection. BEST MODE FOR CARRYING OUT THEINVENTION

[0011] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0012] [Example 1] <1> Prerequisite protective fence The protective fence on which the present invention is based is a protective fence for protecting against avalanches, collapsing soil, or falling rocks, and is equipped with posts erected at known, predetermined intervals and a protective net stretched horizontally between the posts.

[0013] The split support 10 according to the present invention is a support made of concrete-filled steel pipe that can be applied to a safety fence, and includes an intermediate support and an end support. The split support 10 is used by setting its lower part into a concrete foundation or in the ground, and attaching a protective net between the above-ground parts of the split support 10 protruding above the ground surface.

[0014] The safety netting may comprise any one of a wire rope or a netting material such as wire mesh, or a combination of wire rope and a netting material. Furthermore, the protective net may be laid horizontally between a pair of adjacent split supports 10 in span units, or may be laid continuously horizontally across multiple spans. The protective net may be provided with shock-absorbing metal fittings or may not have shock-absorbing fittings.

[0015] In order to attach a safety net to the above-ground portion of the split support pole 10, one or more net attachment elements (e.g., brackets, etc.) are provided at predetermined positions on the outer circumferential surface of the above-ground portion of the split support pole 10. Net attachment elements corresponding to safety nets are well known.

[0016] <2> Overview of split support columns In this example, the split support 10 will be described in a vertical orientation as the basic position. Regarding the split support column 10 shown in FIG. 1, the split support column 10 comprises a lower support column 10A and an upper support column 10B. Both the lower support 10A and the upper support 10B are made of concrete-filled steel pipes of the same diameter and consist of an outer pipe 11 made of steel, reinforcing bars placed inside the outer pipe 11, and a filling material such as concrete filled inside the outer pipe 11.

[0017] In this embodiment, the split support 10 is divided into two parts, an upper part and a lower part, but the number of parts of the split support 10 may be three or more.

[0018] <3> Lower Support The lower support 10A illustrated in Figs. 2 to 4 will be described. The lower support 10A in this example comprises an outer steel tube 11 open at both ends, a plurality of rod-shaped first reinforcing bars 12a arranged at equal intervals within the outer tube 11, a plurality of inner tubes 13 arranged at equal intervals inside the first reinforcing bars 12a, a void tube 15 arranged above the plurality of inner tubes 13, and filling material 14a filled between the inner surface of the outer tube 11 and the outer surface of the inner tube 13. An upwardly facing connecting space S having a bottom is formed at the upper portion of the lower support 10A.

[0019] <3.1>Outer tube The outer pipe 11 is a steel pipe having a circular cross section. An annular flange 16 is integrally formed at the upper end of the outer tube 11 and projects in the radially expanding direction. A plurality of bolt holes are provided at equal intervals in the flange 16, but in the present invention the number of bolt holes can be smaller than in the past, and furthermore there is no need to provide reinforcing ribs between the outer pipe 11 and the flange 16 as in the past.

[0020] <3.2> First reinforcement bar Inside the outer pipe 11 and outside the inner pipes 13, a plurality of first reinforcing bars 12a are arranged concentrically. The first reinforcing bars 12a are reinforcing materials having a length approximately equal to the overall length of the outer pipe 11, and are arranged at equal intervals within the outer pipe 11.

[0021] <3.3>Filling material Except for the connecting space S, the outer tube 11 is filled with a filler 14a. At the bottom of the connecting space S, the upper surface of the filler 14a is exposed.

[0022] <3.4> Connected space A connecting space S is formed at the upper part of the lower support 10A, and within the connecting space S, a plurality of first reinforcing bars 12a are exposed. The connection space S is a space for arranging the first and second reinforcing bars 12a, 12b, and is also a filling space for the connection filler 14c. The depth L of the connection space S is appropriately selected depending on the bending strength of the reinforcing connection portion 20 .

[0023] <3.5> Reinforcement joint The reinforcing connection portion 20 is formed by filling the entire connection space S with the connection filler 14c (FIG. 1). The reinforcing connection part 20 is a high-rigidity column body that connects the lower support 10A and the upper support 10B, and is composed of the outer tube 11 of the lower support 10A, first and second reinforcing bars 12a, 12b arranged in parallel, and connecting filler material 14c.

[0024] <3.6>Inner tube A plurality of inner pipes 13 are arranged in close proximity to each other in the center of the outer pipe 11, inside the plurality of first reinforcing bars 12a. The inner pipe 13 is a hollow steel pipe that is not filled with the filler material 14a, and functions as a reinforcing member.

[0025] The wall thickness of the inner pipe 13 is thinner than that of the outer pipe 11 so that a difference in strength occurs between the outer pipe 11 and the inner pipe 13 . The reason for providing a difference in strength between the two tubes 11, 13 is to cause flattened compressive deformation to occur in the group of multiple inner tubes 13 prior to the outer tube 11 when struck, thereby increasing the toughness of the lower support 10A.

[0026] It should be noted that the multiple inner tubes 13 are not essential and may be omitted.

[0027] <3.7> Void tube A void pipe 15 is disposed in the center of the connecting space S, on the extension line of the multiple inner pipes 13. The void tube 15 is a hollow tube or cylinder having a length spanning the entire length of the connecting space S. The purpose of using the void pipe 15 is to form a cavity when filling the connecting space S with the filler 14a on-site, thereby reducing the amount of the filler 14a to be filled. The material of the void pipe 15 is not particularly limited, and may be made of resin, paper, polystyrene foam, or the like.

[0028] The void tube 15 is used in combination with a plurality of inner tubes 13, but the void tube 15 may be omitted in some cases.

[0029] <4> Upper Support The upper support 10B shown in FIG. 5.6 will be described. In this example, the upper support 10B comprises an outer steel tube 11 open at both ends, a plurality of rod-shaped second reinforcing bars 12b arranged at equal intervals inside the outer tube 11, a plurality of inner tubes 13 arranged at equal intervals inside the second reinforcing bars 12b, and filling material 14b filled between the inner surface of the outer tube 11 and the outer surface of the inner tube 13.

[0030] <4.1>Outer tube The outer pipe 11 is a steel pipe having a circular cross section, and is integrally formed with an annular flange 16 at its lower end, which protrudes in the radially expanding direction.

[0031] <4.2> Filler The filler 14b is filled over the entire length of the outer tube 11 constituting the upper support 10B, and the filler 14b is exposed at the bottom end surface of the outer tube 11.

[0032] <4.3> Secondary reinforcement The second reinforcing bars 12b are reinforcing materials having a length longer than the overall length of the outer pipe 11, and are arranged at equal intervals between the outer pipe 11 and the multiple inner pipes 13. The lower half of the second reinforcing bar 12b protrudes downward from the bottom surface of the filler 14b. This is to insert the lower half of the second reinforcing bar 12b into the connecting space S of the lower support 10A. The protruding length of the second reinforcing bars 12b is appropriately selected depending on the depth L of the connection space S.

[0033] In this example, the second reinforcing bar 12b is shown to be made from a single piece of steel, but the lower half of the second reinforcing bar 12b may be divided and the divided bodies of the second reinforcing bar 12b may be connected and extended on-site via a joint device.

[0034] <5> First and second reinforcement bars The first reinforcing bar 12a and the second reinforcing bar 12b will be explained in more detail.

[0035] <5.1> Arrangement pitch and diameter of multiple first reinforcement bars and multiple second reinforcement bars The multiple first reinforcing bars 12a and the multiple second reinforcing bars 12b described above are each arranged concentrically, but the multiple first reinforcing bars 12a and the multiple second reinforcing bars 12b are arranged at the same radius from the center of the outer pipe 11 and at equal intervals.

[0036] The reason for this configuration is to position the second reinforcing bars 12b between adjacent first reinforcing bars 12a within the connecting space S, as shown in Figure 9, so as to arrange the two types of reinforcing bars 12a, 12b in a concentric manner.

[0037] <5.2> Relationship between the diameters of the first reinforcing bar and the second reinforcing bar When the diameter of the first reinforcing bar 12a is d1 and the diameter of the second reinforcing bar 12b is d2, the diameter of the reinforcing bar 12b may be the same combination (d1 = d2), but the diameter d2 of the second reinforcing bar 12b may be smaller than the diameter d1 of the first reinforcing bar 12a (Figure 9).

[0038] By making the diameter d2 of the second reinforcing bar 12b smaller than the diameter d1 of the first reinforcing bar 12a, an economical arrangement becomes possible. That is, when a bending force acts due to an impact, the bending force is applied more greatly on the lower column 10A side. Therefore, even if the diameter d1 of the first reinforcing bar 12a on the lower column 10A side is made thick and the diameter d2 of the second reinforcing bar 12b on the upper column 10B side is made thin, it can withstand the bending force.

[0039] [Assembly method of split column] Next, the assembly method of the split column 10 will be described with reference to FIGS. 7 to 9.

[0040] <1> Split-in transportation of split column The lower column 10A and the upper column 10B that constitute the split column 10 are manufactured in advance at a factory or the like, and these lower column 10A and upper column 10B are individually transported to the site.

[0041] Even if the overall length of the split column 10 is long and heavy, since the split column 10 is divided into a plurality of parts, it is easy to transport to the site.

[0042] <2> Erection of lower column As shown in FIG. 7, the lower part of the lower column 10A transported to the planned erection position of the split column 10 is buried in a support surface G such as a concrete foundation or the ground and erected.

[0043] <3> Mounting of upper column Next, as shown in FIG. 8, the upper column 10B is mounted on the upper part of the lower column 10A. At this time, the second reinforcing bar 14b protruding from the bottom surface of the upper column 10B is inserted into the connection space S of the lower column 10A.

[0044] 9(A) shows a group of first and second reinforcing bars 14a, 14b arranged in a connection space S. The first reinforcing bars 14a and the second reinforcing bars 14b are alternately positioned and arranged in a cylindrical (annular) shape.

[0045] <4> Bolted connections between flanges (forming flange joints) As shown in FIG. 8, a flange joint is formed by connecting the butted flanges 16, 16 with a plurality of bolt elements 30. The bolt elements 30 may be normal bolts, but the number of bolts can be further reduced by using high tension bolts.

[0046] <5> Injection of filler (formation of reinforcing joints) As shown in FIG. 1, the connection space S is filled with a connection filler 14c to form a reinforcing connection portion 20. The lower support 10A and the upper support 10B are integrally connected via the flange joint and the reinforcing connecting portion 20 described above, thereby assembling a single split support 10.

[0047] As the filling material 14c in the connection space S hardens, continuity is provided between the plurality of consolidating materials 14a, 14b, and 14c.

[0048] As described above, even if the overall length of the split support 10 is long, it can be assembled in a split form, so that the assembly work of the split support 10 on site can be carried out quickly and easily.

[0049] Several methods of filling the connecting filler 14c will be described below, but the method of filling the connecting filler 14c is not limited to these exemplified forms.

[0050] <5.1> Example of filling material injection (1) The method of filling the connecting filler 14c involves providing an injection hole and a check hole at the bottom and top of the connecting space S, injecting the connecting filler 14c through the injection hole provided at the bottom of the connecting space S, and finishing the filling operation when overflow of the filler 14c is confirmed through the check hole provided at the top of the connecting space S. The connecting filler 14c passes between the peripheral surfaces of the first and second reinforcing bars 14a, 14b and fills the entire connecting space S.

[0051] The injection hole may be provided in the upper part of the connecting space S in the same manner as the confirmation hole.

[0052] <5.2> Example of filling material injection (2) As another method of filling the connecting filler 14c, it is possible to inject the connecting filler 14c into the entire connecting space S of the lower support 10A in advance, and then insert and connect the second reinforcing bar 14b of the upper support 10B into the connecting space S into which the filler 14c has been injected.

[0053] [Characteristics of split supports] Next, the characteristics of the split support 10 will be described.

[0054] <1> Damping effect of bending force due to deformation of the inner tube As illustrated in this example, when the inner pipe 13 is buried inside the lower support 10A and the upper support 10B, when a bending force acts on the split support 10, the bending force is transmitted to the outer pipe 11, filler materials 14a, 14b, 14c, and multiple inner pipes 13 that make up the split support 10, respectively, and a bending moment is generated in each of these components.

[0055] Since the wall thickness of the inner pipe 13 is made thin to provide a difference in strength between it and the outer pipe 11, the group of inner pipes 13 undergoes compressive deformation into a flat shape prior to the outer pipe 11. When the inner pipes 13 undergo compressive deformation, energy is absorbed.

[0056] <2> Load distribution through flange joints and reinforced connections In the split support column 10 of the present invention, a flange joint is formed by connecting the flanges 16, 16 of the butted lower support column 10A and upper support column 10B with a plurality of bolt elements 30.

[0057] Furthermore, in the split support 10 of the present invention, the reinforcing connection portion 20 firmly connects the lower support 10A and the upper support 10B through cooperation of two types of reinforcing bar groups (first reinforcing bar 12a and second reinforcing bar 12b) and the connecting filler material 14c. Therefore, the bending force acting on the split support column 10 is distributed and supported by the flange joints and the reinforcing connecting parts 20, respectively. Since the load on the flange joint is reduced, the number of bolt elements 30 can be reduced and there is no need to install additional reinforcing ribs between the flange 16 and the outer pipe 11.

[0058] <3> When a flange joint is damaged If a large bending force is applied to the flange joint, the bolt element 30 will break. In the present invention, since the reinforcing connection portion 20 resists large bending forces as described below, even if all of the bolt elements 30 break, a sudden decrease in the bending strength of the split strut 10 can be prevented.

[0059] <4> Load distribution effect due to reinforced joints In the reinforcing connection portion 20, the outer tube 11 functions as a first restraining member for the connection filler 14c.

[0060] Furthermore, a group of the multiple reinforcing bars 12a, 12b arranged in a cylindrical shape inside the outer pipe 11 functions as a second restraining member that restrains the connecting filler 14c located in the center. That is, the group of multiple reinforcing bars 12a, 12b arranged in a cylindrical shape functions as a pseudo-restraint material (restraint socket), and thus restrains the connecting filler material 14c located at the center of the outer pipe 11.

[0061] Furthermore, the connecting filler 14c formed in a cylindrical shape between the outer pipe 11 and the group of reinforcing bars 12a, 12b arranged in a cylindrical shape functions as a third restraining member that restrains the connecting filler 14c located in the center. The cylindrically formed connecting filler 14c has its inner and outer surfaces sandwiched between the outer pipe 11 and a group of reinforcing bars 12a, 12b arranged in a cylindrical shape. Therefore, the connecting filler 14c formed in a cylindrical shape between the outer pipe 11 and the group of reinforcing bars 12a, 12b also functions as a restraining member for the connecting filler 14c located in the center.

[0062] Such a plurality of binding members significantly improves the binding effect of the connecting filler 14c. Therefore, the bending strength of the reinforcing connecting portion 20 is increased.

[0063] The reinforcing connection portion 20 can not only distribute the load over its entire length, but also distribute and transmit the load over the entire length of the upper column 10B and the lower column 10B via the first reinforcing bar 12a and the second reinforcing bar 12b. Therefore, excessive stress concentration at the connecting parts of the split support 10 can be avoided, and the entire split support 10 can support bending forces. In this way, the split strut 10 of the present invention can achieve both improved bending strength and significant improvement in toughness.

[0064] <5> About the connection position of the split support The split column 10 of the present invention has a structure in which the bending force acting on the split column 10 is distributed and supported by the flange joint connecting the flanges 16, 16 with the bolt elements 30 and the reinforcing connecting portion 20. Therefore, the flange joint does not become a weak point in terms of strength, and the connection position of the split support 10 can be freely selected in the above-ground part that protrudes above ground.

[0065] [Example 2] In the above-described first embodiment, the reinforcing connecting portion 20 is formed on the lower support 10A side. However, the reinforcing connecting portion 20 can also be formed on the lower portion of the upper support 10B side.

[0066] This example is a connecting structure that is the upside down of FIG. 1, with the first reinforcing bar 12a protruding from the upper end surface of the lower support 10A and forming a connecting space at the bottom of the upper support 10B. The first reinforcing bars 12a and the second reinforcing bars 12b are arranged in a cylindrical shape by overlapping them within the connecting space S, and connecting filler 14c is filled into the connecting space S to position the group of first reinforcing bars 12a and second reinforcing bars 12b arranged in a cylindrical shape by overlapping them.

[0067] In short, a connecting space S is formed on either the upper side of the lower support 10A or the lower side of the upper support 10B, and two types of reinforcing bars 12a, 12b are arranged in this connecting space S, and then the connecting filler 14c is filled in to form the reinforcing connection portion 20. [Explanation of symbols]

[0068] G... Support surface S...Connection space 10...Split type support 10A···Lower support 10B...Top support 11...Outer tube 12a...Lower support filler 12b...Upper column filler 13...Inner tube 14a...Lower support filler 14b...Upper column filler 14c... Joint filler 15. Void tube 16...Flange 20... Reinforcement joint 30···Bolt element

Claims

1. A split support for a safety fence made of filled steel pipes, comprising a lower support made of filled steel pipes, the lower part of which is buried in a support surface and erected, and an upper support made of filled steel pipes, which is arranged coaxially with and connected to the lower support, The lower and upper supports have a plurality of reinforcing bars embedded in the filling material in the outer pipe, A flange joint is formed by connecting the lower support and the upper support, which are arranged on the same axis, with a plurality of bolt elements; The reinforcing bars of the lower support and the upper support are overlapped and arranged in a cylindrical shape in the outer tube of either the lower support or the upper support, The reinforcing bar group arranged in a cylindrical shape by overlapping the outer tube with a connecting filler filled in the outer tube of either the lower support or the upper support is positioned to form a reinforcing connection part. Split type posts for protective fences.

2. The split support for a safety fence as described in claim 1, characterized in that the lower support has a plurality of first reinforcing bars arranged within an outer tube, the upper support has a plurality of second reinforcing bars arranged within an outer tube, and either the first reinforcing bars or the second reinforcing bars have a length that exceeds the total length of the lower support or the upper support.

3. The split support for a protective fence as described in claim 2, characterized in that the second reinforcing bar protrudes from the end face of the upper support, forming a connecting space at the top of the lower support, and the first reinforcing bar and the second reinforcing bar are overlapped and arranged in a tubular shape within the connecting space.

4. The split support for a protective fence as described in claim 2, characterized in that the first reinforcing bar protrudes from the end face of the lower support, forming a connecting space at the lower part of the upper support, and the first reinforcing bar and the second reinforcing bar are overlapped and arranged in a tubular shape within the connecting space.

5. The split support for a safety fence as described in claim 2, characterized in that the first reinforcing bars and the second reinforcing bars arranged inside the outer pipe are arranged at the same radius from the center of the outer pipe and at equal intervals.

6. 3. The split support for a safety fence according to claim 2, wherein the diameter of the second reinforcing bar of the upper support is smaller than the diameter of the first reinforcing bar of the lower support.

7. 2. The split support for a safety fence as described in claim 1, characterized in that a plurality of inner tubes made of metal and having a circular cross section are arranged along the axial direction at the center of the outer tube, the plurality of inner tubes are positioned by a filler material filled in the outer tube, and the inner tubes are configured so that they deform into a flattened shape when a bending moment is generated.

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