JP7411299B1 - Split type posts for protective fences - Google Patents

Abstract

An object of the present invention is to provide a split-type support for a protective fence, which allows the connection position of the split-type support to be freely selected and improves both the bending strength and toughness of the split-type support. [Solution] The lower strut 10A is made of a filled steel pipe and the upper strut 10B is made of a filled steel pipe. is buried, and flanges 16, 16 formed at one end of the lower strut 10A and the upper strut 10B are connected by a plurality of bolt elements to form a flange joint. The reinforcing bars 12a of the lower strut 10A and the reinforcing bars 12b of the upper strut 10B are superimposed and arranged in a cylindrical shape inside the outer tube, and the outer tube 11 of either the lower strut 10A or the upper strut 10B is filled with a connecting rod. A group of reinforcing bars 12a and 12b arranged in a cylindrical shape was positioned using a filler 14c to form a reinforcing connecting portion 20. [Selection diagram] Figure 1

Description

The present invention relates to a post for a protective fence that catches fallen objects such as falling rocks, earth and sand, and an avalanche, and particularly to a split-type post that is constructed by dividing the post into a plurality of parts.

Generally, a protective fence includes a plurality of columns and a protective net attached between adjacent columns, and the impact force acting on the protective net is ultimately supported by the strength of the columns.
Hollow steel pipes, H steel, etc. are generally used for the supports, but for protective fences that require high strength, supports made of concrete-filled steel pipes are used.

Since pillars are relatively long and heavy, split-type pillars are used in locations where vehicle transport is difficult or where the protective fence is to be installed in a narrow area.
Patent Document 1 discloses a split-type support column in which the support column is divided into upper and lower parts and constituted by a lower column portion and an upper column portion.

A conventional split-type support column 50 will be explained with reference to FIG.
The split type strut 50 consists of a lower strut 51 and an upper strut 52.
Each of the lower column 51 and the upper column 52 is made of a filled steel pipe, and a plurality of reinforcing bars 54 are arranged inside the steel pipe 53 and filled with a filler material 55 such as concrete or mortar.
An annular flange 56 is provided at the end of each steel pipe 53 to protrude in the diametrical direction.
After the strut lower part 51 and the strut upper part 52 are carried to the site in a divided form, the flanges 56, 56 are butted against each other and connected with a plurality of bolt elements 57 to be assembled into a single strut 50.

Japanese Patent Application Publication No. 2004-162486

The conventional split-type support column 50 has the following points to be improved.
<1> In the split-type column 50, the reinforcing bars 54 are separated between the lower column 51 and the upper column 52, so the connecting portion becomes a plastic hinge and becomes a weak point in terms of strength.
Therefore, the split type support 50 has a lower bending strength than a single support that is not divided.
<2> If the bolt element 57 of the split type support 50 breaks, the support 50 will break at the connection point, and the support function will be instantly lost.
<3> Measures have been taken to increase the strength of the connection, such as increasing the number of bolt elements 57 and additionally installing a plurality of reinforcing ribs 58 between the flange 56 and the steel pipe 53, but the reinforcement cost is expensive.
<4> The connection position between the lower column 51 and the upper column 52 is limited to the 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 can be freely selected. Can not.

An object of the present invention is to provide a split-type support for a protective fence that can solve the above problems.

The present invention provides a protective fence made of filled steel pipes, which comprises 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 strut and the upper strut have a plurality of reinforcing bars embedded in the filling material in the outer tube, and the lower strut and the upper strut are arranged on a coaxial line between flanges formed at one end of the lower strut and the upper strut. Connecting with a plurality of bolt elements to form a flange joint, reinforcing bars of the lower strut and reinforcing bars of the upper strut are overlapped and arranged in a cylindrical shape within the outer tube of either the lower strut or the upper strut, and A group of reinforcing bars arranged in a cylindrical shape and overlapped in the outer tube is positioned using a connecting filler filled in the outer tube of either the lower strut or the upper strut to form a reinforcing connecting portion , and 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, and the plurality of inner tubes are positioned using a filler filled in the outer tube, so that a bending moment is generated. The inner tube is configured to deform into a flat shape when the inner tube is bent .
In another aspect of the present invention, the lower strut includes a plurality of first reinforcing bars arranged in an outer tube, the upper strut includes a plurality of second reinforcing bars arranged in an outer tube, and the first reinforcing bar includes a plurality of second reinforcing bars arranged in an outer tube. Either the reinforcing bar or the second reinforcing bar has a length that exceeds the entire length of the lower strut or the upper strut.
In another aspect of the present invention, the second reinforcing bars protrude from the end surface of the upper column, forming a connecting space in the upper part of the lower column, and the first reinforcing bars and the second reinforcing bars are overlapped in the connecting space. and arrange it in a cylindrical shape.
In another aspect of the present invention, the first reinforcing bar protrudes from an end surface of the lower column, forming a connecting space at the lower part of the upper column, and the first reinforcing bar and the second reinforcing bar are overlapped in the connecting space. and arrange it in a cylindrical shape.
In another aspect of the present invention, the first reinforcing bars and the second reinforcing bars arranged inside the outer tube are arranged at the same radius from the center of the outer tube and at equal intervals.
In another aspect of the present invention, the diameter of the second reinforcing bar of the upper column is smaller than that of the first reinforcing bar of the lower column .

The present invention has at least one of the following effects.
<1> The split-type strut of the present invention has a structure in which the bending force acting on the split-type strut is dispersed and supported by the flange joint and the reinforcing connection portion.
Therefore, since the flange joint does not become a strength weakness, it is possible to freely select the connection position of the split type support in the above-ground part that protrudes above the ground.
<2> In the split strut of the present invention, the reinforcing connection portion resists large bending forces, so even if all the bolt elements break, the bending strength of the split strut can be effectively prevented from dropping rapidly. .
Therefore, even after the bolt element breaks, the support function can be maintained.
<3> Since the reinforcing connection portion supports the bending force acting on the split strut, the load burden on the flange joint can be reduced.
Therefore, the number of bolt elements used in the flange joint can be reduced, and there is no need to additionally install reinforcing ribs between the flange and the outer tube.
<4> Not only the outer tube in the reinforcing connection portion but also a plurality of elements such as a plurality of reinforcing muscle groups arranged in a cylindrical shape inside the outer tube function as a restraining member for the connection filler.
Therefore , the binding effect of the connecting filler increases, and the bending strength of the reinforcing connecting portion increases.
<5> By arranging reinforcing bars across the lower strut and the upper strut, the bending force can be supported by the entire split type strut.
<6> By forming a reinforcing connection portion at the connection portion between the lower support column and the upper support support, the bending strength of the divided support column can be improved, and at the same time, the toughness can be significantly improved.
<7> By arranging multiple inner tubes at the center of the outer tube, the inner tubes not only function as reinforcing members, but also deform into a flattened shape when a bending moment occurs on the split strut, and release energy. can be absorbed .

An explanatory diagram of a split-type support according to Embodiment 1 of the present invention with some parts omitted An explanatory diagram of the partially broken lower support Cross-sectional view of III-III in Figure 2 Cross-sectional view of IV-IV in Figure 2 Explanatory diagram of the upper support with a partially broken part Cross-sectional view of VI-VI in Figure 2 Explanatory diagram of how to assemble a split type support Explanatory diagram of how to assemble a split type support FIG. 8 is a cross-sectional view of the lower strut shown in FIG. 8, (A) is a cross-sectional view of the lower strut before filling with filler, and (B) is a cross-sectional view of the lower strut after being filled with filler. These are explanatory diagrams of the split type strut on which the present invention is based, (A) is a model diagram of the split type strut before connection, and (B) is a model diagram of the split type strut before and after connection.

Embodiments of the present invention will be described below with reference to the drawings.

[Example 1]
<1> Assumed protective fence The protective fence that the present invention presupposes is a protective fence for avalanche prevention, falling soil prevention, or rockfall prevention, and has pillars erected at known predetermined intervals and gaps between the pillars. Equipped with a protective net suspended horizontally.

The split type support 10 according to the present invention is a support made of concrete-filled steel pipe that can be applied to a protective fence, and includes an intermediate support and an end support.
The lower part of the split-type support 10 is built into a concrete foundation or soil, and a protective net is attached between the above-ground parts of the split-type support 10 that protrude above the ground surface.

The protective net includes any one of net materials such as wire rope and wire mesh, or a combination of wire rope and net materials.
Furthermore, the protective net includes a configuration in which it is horizontally suspended in units of spans between a pair of adjacent split-type columns 10, or a configuration in which it is horizontally suspended continuously over a plurality of spans.
The protective net may have a form in which it is provided with a buffer metal fitting, or may be in a form in which it is not provided with a buffer fitting.

In order to attach a protective net to the above-ground part of the split-type support 10, one or more net attachment elements (for example, brackets, etc.) are provided at predetermined positions on the outer peripheral surface of the above-ground part of the split-type support 10. Net attachment elements compatible with protective nets are known.

<2> Outline of split type support In this example, a state in which the split type support 10 is oriented vertically will be described as a basic posture.
The split-type support column 10 illustrated in FIG. 1 will be described. The split-type support column 10 includes a lower support column 10A and an upper support column 10B.
The lower support 10A and the upper support 10B are both made of an outer pipe 11 made of a steel pipe, reinforcing bars placed inside the outer pipe 11, and concrete filled with the same diameter and filled with a filler such as concrete filled inside the outer pipe 11. Made of steel pipe.

In this example, a configuration in which the split-type support 10 is divided into two upper and lower parts will be described, but the number of divisions of the split-type support 10 may be three or more.

<3> Lower strut The lower strut 10A illustrated in FIGS. 2 to 4 will be explained.
The lower support 10A of this example includes an outer tube 11 made of a steel pipe with both ends open, a plurality of rod-shaped first reinforcing bars 12a arranged at equal intervals inside the outer tube 11, and a plurality of rod-shaped first reinforcing bars 12a arranged inside the first reinforcing bars 12a. A plurality of inner tubes 13 arranged at equal intervals, a void tube 15 arranged above the plurality of inner tubes 13, and a filler 14a filled between the inner surface of the outer tube 11 and the outer surface of the inner tube 13. Equipped with
An upward connecting space S with a bottomed structure is formed in the upper part of the lower support column 10A.

<3.1> Outer tube The outer tube 11 is a steel tube with a circular cross section.
An annular flange 16 protruding in the diametrical direction is integrally formed at the upper end of the outer tube 11.
A plurality of bolt holes are formed in the flange 16 at equal intervals, but in the present invention, the number of bolt holes may be smaller than in the conventional case, and furthermore, a reinforcing rib as in the conventional case is provided between the outer tube 11 and the flange 16. There's no need.

<3.2> First Reinforcing Bars Inside the outer tube 11 and outside the plurality of inner tubes 13, a plurality of first reinforcing bars 12a are arranged concentrically.
The first reinforcing bars 12a are reinforcing members having a length approximately equal to the entire length of the outer tube 11, and are arranged at equal intervals within the outer tube 11.

<3.3> Filling material Except for the connection space S, the outer tube 11 is filled with a filling material 14a.
At the bottom of the connection space S, the top surface of the filler 14a is exposed.

<3.4> Connection Space A connection space S is formed in the upper part of the lower support column 10A, and a plurality of first reinforcing bars 12a are exposed within the connection space S.
The connection space S is a space for arranging the first and second reinforcing bars 12a, 12b, and is also a space filled with a 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.

<3.5> Reinforcement Connecting Portion A reinforcing connecting portion 20 is formed by filling the entire area of the connecting space S with a connecting filler 14c (FIG. 1).
The reinforcing connection part 20 is a highly rigid column body that connects the lower support column 10A and the upper support support 10B, and includes the outer pipe 11 of the lower support support 10A and the first and second reinforcing bars 12a and 12b arranged in parallel. and a connecting filler 14c.

<3.6> Inner Pipe Inside the plurality of first reinforcing bars 12a and at the center of the outer tube 11, a plurality of inner tubes 13 are arranged close to each other.
The inner tube 13 is a hollow steel tube that is not filled with a filler 14a, and functions as a reinforcing member.

The wall thickness of the inner tube 13 is thinner than the wall thickness of the outer tube 11 so that a difference in strength occurs between the outer tube 11 and the inner tube 13.
The purpose of providing a strength difference between the two tubes 11 and 13 is to cause the plurality of inner tubes 13 to undergo flat compressive deformation before the outer tube 11 when receiving a blow, thereby increasing the toughness of the lower strut 10A. It's for a reason.

Note that the plurality of inner tubes 13 are not essential and may be omitted.

<3.7> Void Pipe A void pipe 15 is arranged at the center of the connection space S and on an extension line of the plurality of inner pipes 13 .
The void pipe 15 is a hollow tube or cylinder having a length spanning the entire length of the connection space S.
The purpose of using the void pipe 15 is to form a cavity when filling the connection space S with the filler 14a on-site to reduce the amount of the filler 14a.
The material of the void pipe 15 is not particularly limited, and may be made of resin, paper, foamed polystyrene, or the like.

Although the void tube 15 is used in combination with a plurality of inner tubes 13, the void tube 15 may be omitted in some cases.

<4> Upper strut The upper strut 10B illustrated in FIG. 5.6 will be explained.
The upper support 10B of this example includes an outer tube 11 made of a steel pipe with both ends open, a plurality of rod-shaped second reinforcing bars 12b arranged at equal intervals inside the outer tube 11, and an inner side of the second reinforcing bars 12b. It includes a plurality of inner tubes 13 arranged at equal intervals, and a filler 14b filled between the inner surface of the outer tube 11 and the outer surface of the inner tube 13.

<4.1> Outer tube The outer tube 11 is a steel tube with a circular cross section, and an annular flange 16 protruding in the diametrical direction is integrally formed at its lower end.

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

<4.3> Second reinforcing bars The second reinforcing bars 12b are reinforcing members having a length longer than the entire length of the outer tube 11, and are arranged at equal intervals between the outer tube 11 and the plurality of inner tubes 13. be.
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 connection space S of the lower support column 10A.
The protruding length of the second reinforcing bars 12b is appropriately selected depending on the depth L of the connection space S.

In this example, the second reinforcing bar 12b is made of a single piece of steel, but the lower half of the second reinforcing bar 12b is divided and the second reinforcing bar 12b is installed at the site via a joint tool. The divided bodies of 12b may be connected and extended.

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

<5.1> Arrangement pitch and arrangement diameter of the plurality of first reinforcing bars and the plurality of second reinforcing bars The plurality of first reinforcing bars 12a and the plurality of second reinforcing bars 12b described above are arranged concentrically, respectively. However, the plurality of first reinforcing bars 12a and the plurality of second reinforcing bars 12b are arranged at the same radius from the center of the outer tube 11 and at equal intervals.

As shown in FIG. 9, this configuration is such that the second reinforcing bars 12b are positioned between the adjacent first reinforcing bars 12a in the connection space S, and two types of reinforcing bars 12a and 12b groups are arranged. This is because they are arranged concentrically.

<5.2> Relationship between the diameters of the first reinforcing bars and the second reinforcing bars When the diameter of the first reinforcing bars 12a is d ₁ and the diameter of the second reinforcing bars 12b is d ₂ , the diameters of the reinforcing bars 12b are the same. (d ₁ =d ₂ ), or the diameter d ₂ of the second reinforcing bars 12b may be smaller than the diameter d ₁ of the first reinforcing bars 12a (d ₂ <d ₁ ) (FIG. 9).

Economical arrangement is possible by making the diameter d ₂ of the second reinforcing bars 12b smaller than the diameter d ₁ of the first reinforcing bars 12a.
In other words, when a bending force is applied due to an impact, the bending force is applied more to the lower column 10A side, so the diameter d1 of the first reinforcing bar 12a on the lower column 10A side is increased, and the diameter _d1 of the first reinforcing bar 12a on the lower column 10A side is increased, and the second reinforcing bar on the upper column 10B side is increased. Even if the diameter _d2 of 12b is made thinner, it can withstand the bending force.

[How to assemble split type struts]
Next, a method of assembling the split type support 10 will be explained with reference to FIGS. 7 to 9.

<1> Separate delivery of split-type support The lower support 10A and upper support 10B that constitute the split-type support 10 are manufactured in advance at a factory, etc., and these lower support 10A and upper support 10B are individually delivered to the site.

Even if the split-type support 10 has a long overall length and is heavy, it can be easily transported to the site because the split-type support 10 is divided into a plurality of parts.

<2> Erecting the lower support column As shown in FIG. 7, the lower part of the lower support column 10A carried into the planned installation position of the split type support column 10 is buried in a support surface G such as a concrete foundation or the ground, and then erected.

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

FIG. 9(A) shows groups of first and second reinforcing bars 14a and 14b arranged within the connection space S. The first reinforcing bars 14a and the second reinforcing bars 14b are arranged in a cylindrical (annular) shape while being alternately located.

<4> Bolt connection between flanges (formation of flange joint)
As shown in FIG. 8, the abutted flanges 16 are connected by a plurality of bolt elements 30 to form a flange joint.
The bolt elements 30 may be regular bolts, but the use of high tension bolts can further reduce the number of bolts.

<5> Injection of filler (formation of reinforcing joints)
As shown in FIG. 1, a reinforcing connecting portion 20 is formed by filling the connecting space S with a connecting filler 14c.
By integrally connecting the lower strut 10A and the upper strut 10B via the above-described flange joint and reinforcing connection portion 20, a single split-type strut 10 is assembled.

By hardening the filling material 14c in the connection space S, continuity is provided between the plurality of consolidation materials 14a, 14b, and 14c.

As described above, even if the entire length of the split-type support 10 is long, it can be assembled in a divided form, so that the assembly work of the split-type support 10 on-site can be performed quickly and easily.

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.

<5.1> Example of filling material injection (1)
The method of filling the connection filler 14c is to provide an injection hole and a confirmation hole at the bottom and top of the connection space S, and inject the connection filler 14c through the injection hole provided at the bottom of the connection space S. When overflow of the filling material 14c is confirmed through the confirmation hole provided in the upper part of the space S, the filling operation is completed.
The connection filler 14c passes between the circumferential surfaces of the first and second reinforcing bars 14a and 14b groups and fills the entire area of the connection space S.

Note that the injection hole may be provided in the upper part of the connection space S in the same way as the confirmation hole.

<5.2> Example of filling material injection (2)
Another method of filling the connection filler 14c is to inject the connection filler 14c into the entire area of the connection space S of the lower strut 10A in advance, and then fill the connection space S into which the filler 14c has been injected into the upper part. It is also possible to erect and connect the second reinforcing bars 14b of the pillars 10B.

[Characteristics of split type struts]
Next, the characteristics of the split type strut 10 will be explained.

<1> Attenuation of bending force due to deformation of inner tube When the inner tube 13 is buried inside the lower strut 10A and the upper strut 10B as illustrated in this example, the bending force is applied to the split strut 10. When this acts, the bending force is transmitted to the outer tube 11, the fillers 14a, 14b, 14c, and the plurality of inner tubes 13, which constitute the split strut 10, and a bending moment is generated in each of these members.

Since the wall thickness of the inner tube 13 is made thin to provide a strength difference between the inner tube 13 and the outer tube 11, the plurality of inner tubes 13 are compressively deformed into a flat shape before the outer tube 11. Energy is absorbed when the plurality of inner tubes 13 are compressed and deformed.

<2> Load dispersion effect by flange joint and reinforcing connection part In the split type strut 10 of the present invention, the flanges 16, 16 of the butted lower strut 10A and upper strut 10B are connected by a plurality of bolt elements 30 to form a flange joint. form.

Furthermore, in the split type strut 10 of the present invention, in the reinforcing connection portion 20, two types of reinforcing bars (the first reinforcing bars 12a and the second reinforcing bars 12b) cooperate with the connecting filler 14c, so that the lower support 10A and the upper support column 10B are firmly connected.
Therefore, the bending force acting on the split type strut 10 is distributed and supported by the flange joint and the reinforcing connection portion 20, respectively.
Since the load burden on the flange joint is reduced, the number of bolt elements 30 installed can be reduced, and there is no need to additionally install reinforcing ribs between the flange 16 and the outer tube 11.

<3> When the 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, as described below, the reinforcing connecting portion 20 resists a large bending force, so even if all the bolt elements 30 break, the bending strength of the split strut 10 can be prevented from decreasing rapidly.

<4> Load dispersion effect by reinforcing connecting portion In the reinforcing connecting portion 20, the outer tube 11 functions as a first restraining member for the connecting filler 14c.

Furthermore, the plurality of reinforcing bars 12a and 12b arranged in a cylindrical shape inside the outer tube 11 function as a second restraining member that restrains the connecting filler 14c located at the center.
That is, the group of reinforcing bars 12a and 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 tube 11.

Further, the connecting filler 14c formed in a cylindrical shape between the outer tube 11 and the reinforcing bars 12a and 12b arranged in a cylindrical shape restrains the connecting filler 14c located in the center. It functions as a third restraint member.
The connecting filler 14c formed in a cylindrical shape has its inner and outer surfaces sandwiched between the outer tube 11 and a group of reinforcing bars 12a and 12b arranged in a cylindrical shape.
Therefore, the connecting filler 14c formed in a cylindrical shape between the outer tube 11 and the group of reinforcing bars 12a and 12b also functions as a restraining member for the connecting filler 14c located at the center.

Such a plurality of restraining members greatly enhances the restraining effect of the connecting filler 14c.
Therefore, the bending strength of the reinforcing connection portion 20 is increased.

The reinforcing connection part 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 through the first reinforcing bar 12a and the second reinforcing bar 12b. can.
Therefore, excessive stress concentration on the connecting portions of the split struts 10 can be avoided, and the bending force can be supported by the entire split struts 10.
In this manner, the split strut 10 of the present invention can achieve both an improvement in bending strength and a significant improvement in toughness.

<5> About the connection position of the split type strut In the split type strut 10 of the present invention, the bending force acting on the split type strut 10 is transferred to the flange joint where the flanges 16, 16 are connected by the bolt element 30 and the reinforcing connection part 20. It is a structure that supports distributed support.
Therefore, since the flange joint does not become a weak point in strength, it is possible to freely select the connection position of the split type support 10 in the above-ground part that protrudes above the ground.

[Example 2]
In the first embodiment, the reinforcing connecting portion 20 is formed on the side of the lower column 10A, but it is also possible to form the reinforcing connecting portion 20 on the lower side of the upper column 10B.

This example has a connection structure in which the top and bottom of FIG. 1 are reversed, and the first reinforcing bars 12a protrude from the upper end surface of the lower support column 10A to form a connection space in the lower part of the upper support column 10B.
The first reinforcing bars 12a and the second reinforcing bars 12b are superimposed and arranged in a cylindrical shape in the connection space S, and the first reinforcing bars 12a and the second reinforcing bars 12b are filled in the connection space S and overlapped and arranged in a cylindrical shape. The reinforcing bars 12a and the second reinforcing bars 12b group are positioned.

In short, a connection space S is formed on either the upper side of the lower support column 10A or the lower side of the upper support support 10B, and after arranging the two types of reinforcing bars 12a and 12b in this connection space S, filling for connection is performed. It is sufficient if the reinforcing connecting portion 20 is formed by filling the material 14c.

G...Support surface S...Connection space 10...Divided column 10A...Lower column 10B...Upper column 11...Outer tube 12a...Lower column Filler 12b...Filler for upper support 13...Inner pipe 14a...Filler for lower support 14b...Filler for upper support 14c...Filler for connection 15... Void pipe 16...Flange 20...Reinforcement connection part 30...Bolt element

Claims (6)

A split type support for a protective fence made of a filled steel pipe, consisting of a lower support made of a filled steel pipe, the lower part of which is buried in a supporting surface and erected, and an upper support made of a filled steel pipe, which is arranged coaxially with the lower support and connected to the lower support. And,
The lower column and the upper column have a plurality of reinforcing bars embedded in a filling material inside the outer tube,
A flange joint is formed by connecting flanges formed at one end of the lower strut and the upper strut arranged on a coaxial line with a plurality of bolt elements,
The reinforcing bars of the lower strut and the reinforcing bars of the upper strut are overlapped and arranged in a cylindrical shape within the outer tube of either the lower strut or the upper strut,
forming a reinforcing connection portion by positioning a group of reinforcing bars arranged in a cylindrical shape and superimposed within the outer tube using a connecting filler filled in the outer tube of either the lower strut or the upper strut ;
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 filled in the outer tube, and the inner tubes are configured to deform into a flat shape when a bending moment occurs.
Split type posts for protective fences. The lower strut includes a plurality of first reinforcing bars arranged in the outer tube, the upper strut includes a plurality of second reinforcing bars arranged in the outer tube, and either the first reinforcing bars or the second reinforcing bars are arranged in the outer tube. The split strut for a protective fence according to claim 1, wherein one of the reinforcing bars has a length that exceeds the entire length of the lower strut or the upper strut. The second reinforcing bar protrudes from the end surface of the upper column, forming a connecting space in the upper part of the lower column, and the first reinforcing bar and the second reinforcing bar are overlapped and arranged in a cylindrical shape in the connecting space. The split-type post for a protective fence according to claim 2, characterized in that: The first reinforcing bars protrude from the end faces of the lower columns, forming a connecting space at the bottom of the upper supporting columns, and the first reinforcing bars and the second reinforcing bars are overlapped and arranged in a cylindrical shape in the connecting space. The split-type post for a protective fence according to claim 2, characterized in that: The protective fence according to claim 2, wherein the first reinforcing bars and the second reinforcing bars arranged inside the outer tube are arranged at the same radius from the center of the outer tube and at equal intervals. Split type support. The split type support for a protective fence according to claim 2, wherein the diameter of the second reinforcement of the upper support is smaller than that of the first reinforcement of the lower support .

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