Composite posts for protective fences

Abstract

To provide a composite support for a guard fence that can exhibit high impact absorption function through a rational design. [Solution] The composite support 1 of the protective fence of the present invention comprises a lower structure 10 having a reinforcing steel pipe 11 protruding above ground from a long hole B formed in the ground and foundation filling material 12 filled in the long hole B, and an upper structure 20 having a support steel pipe 21 inserted over the above-ground portion of the reinforcing steel pipe 11 and support filling material 22 filled in the support steel pipe 21, wherein the reinforcing steel pipe 11 has a steel pipe body 11a, an internal filling material 11b filled inside the steel pipe body 11a, and a plurality of reinforcing materials 11c arranged within the internal filling material 11b, and the composite support 1 is characterized in that it comprises a reinforcing section 1a extending over the entire length of the steel pipe body 11a, and a filling section 1b extending from the upper end of the steel pipe body 11a to the upper surface of the support filling material 22.

Description

[Technical Field]

[0001] The present invention relates to a composite support post for a safety fence, and more particularly to a composite support post for a safety fence that can exhibit high impact absorption capabilities through a rational design. [Background technology]

[0002] BACKGROUND ART Protective fences such as rockfall protection fences and avalanche prevention fences are constructed by extending a blocking surface made of wire mesh or wire between posts embedded in the installation surface. The posts of a safety fence are important structural elements that have a significant impact on the performance of the entire fence, as they absorb the impact energy of falling rocks and other objects through their blocking surfaces.To ensure impact absorption performance, the posts of a safety fence must not only be rigid and durable, but also have high toughness to disperse and effectively absorb the impact energy. Cited documents 1 to 8 disclose a reinforcement structure of a support pillar in which a reinforcing core material such as reinforcing bars, steel material, or steel pipe is inserted inside a steel pipe pile and filled with grout material. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-031741 [Patent Document 2] Japanese Patent Application Laid-Open No. 2009-249930 [Patent Document 3] Japanese Patent Application Laid-Open No. 2012-026206 [Patent Document 4] Japanese Patent Application Laid-Open No. 2012-177261 [Patent Document 5] International Publication No. 2017 / 109819 [Patent Document 6] Japanese Patent Application Publication No. 2017-203292 [Patent Document 7] Japanese Patent Publication No. 2025-021621 [Patent Document 8] Japanese Patent Application Publication No. 2025-038598 Summary of the Invention [Problem to be solved by the invention]

[0004] The conventional technology has the following problems. <1> Because the entire support pillar has the same cross-sectional structure, it is necessary to design the entire pillar in accordance with the required performance of the base, where the bending force is greatest when struck by a falling rock, etc. This results in over-design near the top end of the pillar, where the bending force is relatively smaller, resulting in increased manufacturing costs. <2> The diameter and material of the steel pipe must be selected and combined according to the required performance of the protective fence, which increases the complexity of the design and increases manufacturing costs. <3> In the case of pillars with a one-piece structure, they are heavy and require large heavy machinery for transportation and installation. This makes construction difficult in narrow sites such as mountainous areas. In addition, in the case of pillars with a connected structure using flange joints, the joint connection work is time-consuming and labor-intensive, and the joint position is restricted because the joint is a weak point in the structure, making the design complex. <4> The process of welding the blocking surface fittings to a long steel pipe and then inserting the internal reinforcing members into the pipe after welding requires large heavy machinery and a large space, making the process difficult and time-consuming and costly to manufacture.

[0005] SUMMARY OF THE INVENTION An object of the present invention is to provide a composite support for a safety fence that solves the above problems. [Means for solving the problem]

[0006] The composite support of the protective fence of the present invention comprises a lower structure having a reinforcing steel pipe protruding above ground from a long hole provided in the ground and a foundation filler filled in the long hole, and an upper structure having a support steel pipe inserted over the above-ground portion of the reinforcing steel pipe and a support filler filled in the support steel pipe, wherein the reinforcing steel pipe has a steel pipe body, an internal filler filled inside the steel pipe body, and a plurality of reinforcing materials arranged within the internal filler, and the composite support is characterized by comprising a reinforcing section extending over the entire length of the steel pipe body and a filling section extending from the upper end of the steel pipe body to the upper surface of the support filler.

[0007] In the composite support of the safety fence of the present invention, the lower structure may include a foundation steel pipe inserted into the long hole, and a foundation filler may be filled between the foundation steel pipe and the reinforcing steel pipe.

[0008] In the composite support of the safety fence of the present invention, the upper portions of the multiple reinforcements may protrude from within the interior filling material into the support filling material.

[0009] The composite support of the safety fence of the present invention may further comprise a hollow section within the composite support ranging from the upper surface of the support filler material to the upper end of the support steel pipe.

[0010] In the composite support of the safety fence of the present invention, the reinforcing steel pipe may comprise a plurality of hollow reinforcing steel pipes disposed within an internal filler material. [Effects of the Invention]

[0011] The composite support of the protective fence of the present invention has the above-mentioned configuration and therefore has at least one of the following effects. <1> The structure has multiple cross sections set within a single composite support, so that the toughness is highest by placing reinforcing steel pipes in the area including the base where the bending force during impact is greatest, and the toughness is relatively low near the upper end where the bending force is small.This eliminates over-design that would result from matching the entire support to the required performance of the base, making it possible to achieve a rational, low-cost design. <2> By changing the height of the above-ground part of the steel pipe body and the protruding length of the reinforcement material according to the required performance of the protective fence, the toughness and bending strength of the entire support can be freely designed using components of the same standard. <3> The structure has reinforcement sections placed across the connection between the upper structure and lower structure, so even though it is a composite structure integrated on site, the connection sections do not become weak points and it is able to exhibit high impact absorption capabilities. <4> Because the superstructure and substructure are integrated on-site, the composite structure allows for lighter and shorter components, making it easier to transport and handle on-site, and since it does not require large heavy machinery, it can be installed in narrow locations such as mountainous areas. <5> The substructure, made of reinforcing steel pipes, and the superstructure, which is equipped with mounting fixtures for the blocking surface, are manufactured separately and then integrated on-site, making it a composite structure, which makes it easy to manufacture the components and reduces installation costs. [Brief explanation of the drawings]

[0012] [Figure 1] An explanatory diagram of the composite support of the protective fence of the present invention. [Figure 2] Schematic diagram of protective fence [Figure 3] Explanation of the lower structure [Figure 4] Reinforced steel pipe diagram [Figure 5] Illustration of shock absorption function [Figure 6] Explanatory diagram of Example 2 [Figure 7] Explanatory diagram of Example 3 DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, the composite support post of the safety fence of the present invention (hereinafter simply referred to as "composite support post") will be described in detail with reference to the drawings. [Example]

[0014] <1> Composite support (Figure 1) Composite support 1 is a support for protective fence A. The composite support 1 is a composite structure that includes at least a substructure 10 erected from the underground portion to the aboveground portion, and an upper structure 20 extrapolated onto the substructure 10. One feature of the present invention is that multiple cross-sectional structures including a reinforced section 1a with relatively high toughness and a filled section 1b with relatively low toughness are set within a single composite support 1. In this example, a hollow section 1c is also set.

[0015] <1.1> Protective fence (Fig. 2) Protective fence A is a structure that blocks and buffers external collisions. The protective fence A comprises a plurality of composite supports 1 erected at predetermined intervals and a blocking surface A1 extending between adjacent composite supports 1. In this example, the protective fence A is a rockfall protection fence, and the blocking surface A1 is composed of a wire mesh stretched on the back of the composite support 1 and multiple wire ropes stretched between adjacent composite support pillars 1. In addition, in the present invention, the protective fence A can be applied to any structure, regardless of the type, such as a rockfall protection fence, avalanche protection fence, avalanche prevention fence, or vehicle protection fence, as long as it is a fence that can absorb impact with the blocking surface A1 between the posts.

[0016] <2> Substructure (Figure 3) The substructure 10 is a structure that has both the function of embedding into the ground and the function of reinforcing the superstructure 20. The substructure 10 includes at least a reinforcing steel pipe 11 and a foundation filling material 12. In this example, a foundation steel pipe 13 is further included. The foundation steel pipe 13 is a circular steel pipe that is inserted into the long hole B to reinforce the underground portion of the substructure 10. The outer diameter of the foundation steel pipe 13 corresponds to the inner diameter of the long hole B. The foundation filler 12 is a grout material that is filled into the long hole B. In this example, mortar is used as the foundation filler 12, and it is filled into the gap between the reinforcing steel pipe 11 and the foundation steel pipe 13. However, the foundation filler is not limited to mortar, and other cement-based grout materials, resin-based grout materials such as epoxy resin, etc. may also be used.

[0017] <2.1> Reinforced steel pipe (Fig. 4) The reinforcing steel pipe 11 is a reinforcing member disposed within the composite support 1. The reinforcing steel pipe 11 comprises at least a steel pipe body 11a, an internal filler 11b filled in the steel pipe body 11a, and a plurality of reinforcing members 11c arranged within the steel pipe body 11a. In this example, the reinforcing steel pipe 11 further comprises a plurality of small-diameter steel pipes 11d arranged within the steel pipe body 11a. In detail, the reinforcing steel pipe 11 is configured as an LST steel pipe (lotus-root hollow structure steel pipe) in which bundled thin steel pipes 11d are inserted into a steel pipe main body 11a made of, for example, a circular steel pipe, multiple reinforcing members 11c are inserted between the steel pipe main body 11a and the thin steel pipes 11d so that their upper parts protrude above the steel pipe main body 11a, and an internal filling material 11b such as cement-based grout material is filled into the steel pipe main body 11a and hardened. LST steel pipes have a large cross-sectional area, which gives them high strength and toughness in all directions, and they can maintain a relatively high strength even after deformation due to impact. In addition, because the small diameter steel pipes 11d are hollow, they are lightweight and easy to install. However, the structure of the reinforcing steel pipe 11 is not limited to the above, and for example, the reinforcing steel pipe 11 may not include the small diameter steel pipe 11d, but may be structured to consist of only the internal filling material 11b and the reinforcing material 11c.

[0018] <2.1.1> Reinforcement material (Fig. 4) The reinforcing member 11c is a member that reinforces the reinforcing steel pipe 11 from the inside. In this example, reinforcing bars are used as the reinforcing members 11c, but other materials such as deformed steel bars, round steel bars, PC steel bars, deformed PC steel bars, etc. may also be used. In this example, the reinforcing material 11c protrudes from the upper part of the steel pipe main body 11a and is fixed in the support filler 22, thereby exerting a function of reinforcing the connection with the superstructure 20.

[0019] <3> Superstructure (Figure 1) The upper structure 20 is a structure that has a support function for the blocking surface A1. The superstructure 20 comprises at least a steel support pipe 21 and a support filler 22 . The support steel pipe 21 is a circular steel pipe that is fitted onto the reinforcing steel pipe 11. A plurality of mounting fixtures 21a are attached to the outer periphery of the support steel pipe 21 in a predetermined arrangement to mount the blocking surface A1. The support filler 22 is a grout material that is filled inside the support steel pipe 21. In this example, mortar is used as the support filler 22, but other cement-based grout materials, resin-based grout materials such as epoxy resin, etc. may also be used. The pillar filler 22 is filled between the steel pipe body 11a and the pillar steel pipe 21, and above the steel pipe body 11a within the pillar steel pipe 21, thereby integrating the substructure 10 and the superstructure 20.

[0020] <3.1> Hollow section (Fig. 1) In this example, the support filler 22 is not filled up to the top of the support steel pipe 21, and a hollow portion 1c is provided at the top of the support filler 22. The upper part of the support steel pipe 21 is subject to a relatively small bending force when hit by a falling rock or the like, and therefore does not require the same toughness or rigidity as the reinforced part 1a or the filled part 1b. Therefore, by making the upper part of the support steel pipe 21 a hollow structure that is not filled with the support filler material 22, excessive design can be eliminated and costs can be reduced. Furthermore, by providing the hollow portion 1c at the top of the support steel pipe 21, the center of gravity of the superstructure 20 is lowered, and the bending moment due to its own weight is reduced. This reduces the bending stress on the superstructure 20. However, the hollow portion 1c is not an essential component, and the support filler 22 may be filled up to the top of the support steel pipe 21, so that the hollow portion 1c is not provided.

[0021] <4> Installation of protective fences The protective fence A equipped with the composite support 1 of the present invention is installed, for example, in the following manner. Using a drilling device such as an auger, a plurality of circular long holes B are drilled at predetermined intervals in the ground at the installation location of the protective fence A. The depth of the long holes B corresponds to the length of the foundation steel pipe 13. The foundation steel pipe 13 is inserted into the long hole B, and the lower part of the reinforcing steel pipe 11 is inserted and held in the foundation steel pipe 13. At this time, the reinforcing steel pipe 11 is positioned at the center of the foundation steel pipe 13. The reinforcing steel pipe 11 may be inserted up to the bottom of the foundation steel pipe 13, or may be inserted halfway. The reinforcing steel pipe 11 is fixed in the long hole B by filling the gap between the foundation steel pipe 13 and the reinforcing steel pipe 11 with foundation filler 12 and hardening it. The support steel pipe 21 is lifted up and inserted from above onto the reinforcing steel pipe 11. At this time, the reinforcing steel pipe 11 is positioned at the center of the support steel pipe 21. The support steel pipe 21 is filled with support filler material 22. The composite support 1 is constructed by hardening the support filler 22 and integrating the substructure 10 and the superstructure 20 together. Using a known procedure such as connecting a wire rope to the mounting fixtures 21a of multiple parallel composite supports 1, a blocking surface A1 is extended between the composite supports 1, and a protective fence A is constructed.

[0022] <5> Classification of composite supports (Figure 1) In this example, the entire length of the composite pillar 1 is made up of a combination of a reinforcing portion 1a, a filling portion 1b, and a hollow portion 1c, which have different toughnesses. The reinforced portion 1a is a portion that includes the base of the superstructure 20, and occupies the range from the lower end to the upper end of the steel pipe main body 11a. The reinforced portion 1a has a double steel pipe structure in which the foundation filler 12 and the steel pipe main body 11a overlap within the foundation steel pipe 13 in the underground portion, and the support filler 22 and the steel pipe main body 11a overlap within the support steel pipe 21 above ground. The filled section 1b is the middle section of the superstructure 20, and occupies the range from the upper end of the steel pipe main body 11a in the superstructure 20 to the upper surface of the column filler 22. The filled section 1b is made of a filled steel pipe structure in which the column filler 22 is placed inside the column steel pipe 21. In this example, a reinforcing material 11c is placed inside the column filler 22 at the bottom of the filled section 1b. The hollow portion 1c is the upper portion of the superstructure 20, and occupies the range from the upper surface of the column filler 22 in the superstructure 20 to the upper end of the column steel pipe 21. The hollow portion 1c is formed by the hollow structure of the column steel pipe 21. With the above structure, the composite support 1 has a relationship in which toughness and rigidity increase in the order of the reinforced portion 1a, the filled portion 1b, and the hollow portion 1c. The composite support 1 of the present invention has a rational structure in which the cross-sectional structure is set in stages and a reinforcing section 1a is set in a part including the base of the superstructure 20 where the bending moment is greatest when hit by a falling rock or the like, i.e., in a part including the boundary between the underground and above-ground parts, thereby eliminating excessive design of the entire structure. In addition, by changing the height of the above-ground part of the steel pipe main body 11a and the protruding length of the reinforcing material 11c according to the required performance of the protective fence A, the toughness and rigidity of the entire composite support 1 can be designed arbitrarily using common components.

[0023] <6> Impact absorption function (Figure 5) When a rock mass C sliding down from the mountain side collides with the blocking surface A1 of the protective fence A, collision energy is generated at the blocking surface A1, and a large bending force is transmitted from the blocking surface A1 to the superstructure 20 toward the valley side (Figure 5(a)). This bending force is weakest near the top of the support steel pipe 21 and greatest near the base of the support steel pipe 21 (the lower part of the above-ground part). Since the composite support 1 has a structure in which a reinforcing section 1a is placed at the base of the above-ground section, the reinforcing section 1a mainly resists the bending force during a collision, and when the bending force exceeds the buckling strength of the reinforcing section 1a, the reinforcing section 1a undergoes plastic deformation toward the valley side, effectively absorbing the collision energy (Figure 5(b)). The composite support 1 of the present invention has a structure in which the toughness and rigidity change gradually from the underground to the top, which allows the toughness and rigidity to be concentrated at the base where the greatest bending force occurs, while eliminating unnecessary reinforcement in other parts, thereby achieving a rational and efficient structure with the minimum necessary reinforcement. [Example]

[0024] [Example without foundation steel pipe] (Fig. 6) In Example 1, the substructure 10 includes a foundation steel pipe 13, and a reinforcing steel pipe 11 is inserted into the foundation steel pipe 13 placed in the long hole B, but the foundation steel pipe 13 is not an essential component of the substructure 10. In this example, the substructure 10 does not include the foundation steel pipe 13. In this example, a reinforcing steel pipe 11 is directly inserted into a long hole B drilled in the ground, and a foundation filler 12 is filled between the long hole B and the reinforcing steel pipe 11, thereby erecting the substructure 10. [Example]

[0025] [Example where reinforcement material does not protrude] (Fig. 7) In Examples 1 and 2, in the filling section 1b, the reinforcing material 11c protrudes from above the steel pipe main body 11a into the support pillar filling material 22 to strengthen the connection between the lower structure 10 and the upper structure 20, but depending on the required performance of the protective fence A, the reinforcing material 11c may not protrude into the support pillar filling material 22 but may be buried in the steel pipe main body 11a. [Explanation of symbols]

[0026] 1 Composite strut 1a Reinforcement part 1b Filling section 1c Hollow part 10 Undercarriage 11 Reinforced steel pipe 11a Steel pipe body 11b Internal filler 11c Reinforcement 11d small diameter steel pipe 12 Basic filler 13 Basic steel pipes 20 Superstructure 21 Prop steel pipe 21a Mounting fixture 22 Post filler A Protective fence A1 Blocking surface B long hole C. Rock mass

Claims

1. A composite support for a protective fence with a blocking surface, a substructure including a reinforcing steel pipe protruding above ground from a long hole provided in the ground and a foundation filling material filled in the long hole; a superstructure including a support steel pipe inserted onto the above-ground portion of the reinforcing steel pipe, the support steel pipe having a plurality of mounting fixtures for mounting the blocking surface along the height direction; and a support filler material filled into the support steel pipe, The reinforced steel pipe has a steel pipe body whose upper edge is located above the lowest mounting fixture, an internal filling material filled inside the steel pipe body, and a plurality of reinforcing materials arranged inside the internal filling material whose upper portions protrude from the upper edge of the steel pipe body into the support filler, The composite support is characterized in that it is configured with a reinforcing portion in a range corresponding to the entire length of the steel pipe body, a filling portion in a range from the upper end of the steel pipe body to the upper surface of the support filler, and a hollow portion in a range from the upper surface of the support filler to the upper end of the support steel pipe. Composite posts for protective fences.

2. the substructure includes a foundation steel pipe inserted into the long hole; The foundation filler is filled between the foundation steel pipe and the reinforcing steel pipe. A composite support for a safety fence according to claim 1.

3. The reinforcing steel pipe comprises a plurality of small diameter steel pipes disposed within the internal filler. A composite support for a safety fence according to claim 1 or 2.

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