Guardrail

Abstract

To propose a post structure for a protective fence, which has a simple structure and can adjust its strength. [Solution] The system comprises a number of exterior columns 20 arranged vertically at intervals, a number of restraining plates 30 arranged in multiple stages across the multiple exterior columns 20 and connecting the multiple exterior columns 20 in a load-transmitting manner, and a number of brace members 40 arranged vertically and connecting adjacent restraining plates 30 above and below in a load-transmitting manner, and multiple load-bearing sections of the rigid frame structure are formed along the height direction in accordance with the installation spacing of the restraining plates 30, and the exterior columns 20, restraining plates 30 and brace members 40, which are stress members, are configured to be able to be assembled.

Description

[Technical field]

[0001] The present invention relates to a protective fence technology that captures falling objects such as falling rocks, collapsing soil, and avalanches with a protective net or other blocking surface, and in particular to a protective fence technology that can easily adjust the strength according to the on-site conditions. fence Regarding. [Background technology]

[0002] A protective fence having a number of posts erected at intervals and a protective net stretched between adjacent posts is well known, and various types of protective fences have been proposed depending on their resistance to attack. In this type of protective fence, the impact force (kinetic energy) generated when the protective net captures falling objects is ultimately supported by the posts, so the strength of the posts is set according to the anticipated impact force of the falling objects.

[0003] Typical supports are made of hollow steel pipes alone, or a support structure that combines steel pipes with various reinforcing structures. Known reinforcement means for increasing the strength of steel pipe supports include, for example, a support structure in which a steel pipe is filled with mortar or the like (Patent Document 1), a support structure in which a reinforcing H-shaped steel beam is inserted into a hollow steel pipe (Patent Document 2), and a support structure in which a mortar-filled steel pipe is reinforced by arranging multiple steel bars (Patent Document 3), and the like. Different support structures are used depending on their energy absorption performance. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2002-47617 A [Patent Document 2] Patent Publication No. 2022-76584 [Patent Document 3] JP 2012-177261 A Summary of the Invention [Problem to be solved by the invention]

[0005] Conventional support structures have the following inherent problems to be solved: <1> Although the conventional support structure disclosed in Patent Documents 1 to 3 has high rigidity, its production requires a lot of work and the production costs are high. <2> Conventional pillar structures are heavy because they require reinforcing materials such as H-shaped steel beams or steel bars to be placed inside the steel pipes and mortar to be filled along the entire length of the steel pipes. Therefore, the support structure cannot be handled by human power alone, and heavy machinery is required to transport the support structure to the site and to erect it on site. <3> Although the impact force of a collapsed object varies depending on the location of the protective fence, the strength of all of the support structures is manufactured to match the maximum anticipated impact force of a collapsed object. This makes the design of the support structure uneconomical. <4> To adjust the strength of conventional pillar structures, it is necessary to change the cross-sectional dimensions of the steel pipes and reinforcing materials, or the thickness of the steel pipes, making it complicated to manage and use many different types of steel materials with different dimensions and thicknesses. Therefore, it is not possible to easily adjust the design strength of the support structure depending on the installation location on site.

[0006] The present invention has been made in view of the above points, and an object of the present invention is to provide a protection device having a simple structure and adjustable strength. fence The purpose of this study is to propose the following. [Means for solving the problem]

[0007] The present invention relates to a support structure provided at an interval and a support structure formed between adjacent support structures. , falling rocks, collapsing soil, avalanches, etc.and a blocking surface for capturing collapsed objects, the support structure comprises a plurality of outer columns arranged vertically at intervals, a plurality of restraining plates arranged in multiple stages across the plurality of outer columns and connecting the plurality of outer columns in a load-transmitting manner, and a plurality of braces arranged vertically and connecting adjacent restraining plates vertically in a load-transmitting manner, forming a plurality of rigid frame load-bearing sections along the height direction in accordance with the installation intervals of the restraining plates, The outer column is a stress member having a length spanning a plurality of load-bearing sections; The outer columns, restraining plates and braces which are stress members Change the strength of the support structure by selecting the number of installations. Possible configuration The blocking surface includes at least one of a steel or fiber rope material or a steel or fiber net material, and an intersection between the outer column of the support structure and the blocking surface is attached so as to be capable of transmitting a load. This is what was done. In another form of the present invention, three or more column holes through which the outer columns can pass and a plurality of fitting slits into which the upper and lower ends of the brace can be fitted are formed on the plate surface of the restraint plate, and the number of stress members of at least one of the outer columns or brace members to be assembled can be selected depending on the design strength. In another form of the present invention, in all load-bearing sections formed along the height direction, the number of at least one stress member of the outer columns or bracing members which are stress members may be configured as the same combination, or in multiple load-bearing sections formed along the height direction, the number of at least one stress member of the outer columns or bracing members which are stress members may be configured as different combinations. In another embodiment of the present invention, a positioning means for the restraining plate may be additionally provided for positioning the restraining plate immovably relative to the outer pillar. In another embodiment of the present invention, the brace material may include a pair of bending frames and a connecting pin that connects the bending portions of the bending frames. Effect of the Invention

[0008] The present invention has at least one of the following advantages. <1> By simply selecting the appropriate number of stress members to be installed in at least one of the outer columns or bracing materials that make up the support structure, a support structure can be individually manufactured to meet the strength (bending strength, axial force, shear force) required on site. <2> By selecting the number of stress members of at least one of the outer columns or braces, it is possible not only to change the overall strength of the support structure, but also to partially reinforce load-bearing sections at specific heights. Therefore, the strength of the support structure can be easily changed. <3> When assembling the support structure, the overall length of the support structure can be individually adjusted to suit the site by appropriately selecting the number of stress members to be installed in the support structure. <4> The entire support structure is a rigid-frame structure, so it is lightweight yet highly durable. In particular, even if the outer columns have a long overall length, the intermediate portions of the outer columns are restrained and reinforced by multiple restraining plates, so that they can exhibit high resistance to buckling. <5> One possible way to increase the strength of the pillar structure is to use outer pillars with different diameters and material thicknesses. Increasing the diameter of the outer columns not only makes them heavier and harder to handle, but also requires changing the diameter of the column hole in the restraint plate. In addition, as the number of types of stress members that make up the support structure increases, managing and using the stress members becomes complicated. In the present invention, since stress members of the same standard are used in the manufacture of the support structure, there is no need for troublesome management and selection of stress members. <6> Since all of the stress members that make up the pillar structure are lightweight, the materials can be divided into small pieces and transported to the site using only the manual labor of workers, without the need for large transport vehicles, and the pillar structure can be assembled using only the manual labor of workers. <7> Since the support structure is a prefabricated structure, when the stress members of the support structure (outer columns, restraining plates or braces) are deformed, the support structure can be easily repaired by replacing the minimum number of stress members required. [Brief description of the drawings]

[0009] [Figure 1] A perspective view of a guardrail having a support structure and a blocking surface. [Diagram 2] Cross section of protective fence [Diagram 3] Plan of the protective fence [Figure 4]Cross-sectional view taken along line IV-IV in FIG. [Diagram 5] Illustration of how to assemble the support structure [Figure 6] An explanatory diagram of how to assemble a support structure by installing bracing materials between the upper and lower restraining plates. [Figure 7] FIG. 13 is an explanatory diagram of another embodiment in which the support structure is reinforced. [Figure 8] Cross-sectional view taken along line VIII-VIII in FIG. [Figure 9] FIG. 13 is an explanatory diagram of a modified example of a support structure in which the planar shape of the restraining plate is formed into a disk shape. [Figure 10] Horizontal cross-section of the support structure shown in Figure 9. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] The present invention will now be described in detail with reference to the drawings.

[0011] 1. Overview of the protective fence The following description will be given with reference to FIGS. The protective fence exemplified in the present invention comprises at least a prefabricated support structure 10 erected at a predetermined interval, and a blocking surface 50 attached between adjacent support structures 10. The protective fence of this example will be described in detail below.

[0012] 2. Support structure The following description will be given with reference to FIGS. The support structure 10 is an assembled support comprising a plurality of outer columns 20 arranged vertically at intervals, a plurality of restraint plates 30 arranged in multiple stages across the plurality of outer columns 20 and connecting the plurality of outer columns 20 so as to enable load transmission, and a plurality of brace members 40 arranged vertically and connecting adjacent restraint plates 30, 30 above and below so as to enable load transmission.

[0013] In order to make the invention easier to understand, for the sake of convenience, the support structure 10 will be divided into several sections according to the installation spacing of the restraint plates 30, and each section obtained by dividing the support structure 10 at equal intervals in the vertical direction will be defined as a load-bearing section 11 and described. Each load-bearing section 11 has a rigid frame structure.

[0014] The column structure 10 has a polygonal planar shape. The width and height of the support structure 10 as viewed from the side can be selected as appropriate. In practice, the width of the column structure 10 as viewed from the side is, for example, 30 to 60 cm, and the height is 2 to 6 m.

[0015] The present invention configures the support structure 10 in an assembled form using multiple stress members (outer columns 20, restraining plates 30, and brace members 40) in order to improve the handleability of these stress members and to enable the strength of the support structure 10 to be individually adjusted (changed) by appropriately selecting the number of these stress members to be installed. The components of the support structure 10 will be described in detail below.

[0016] <1> outer pillar The outer pillars 20 are rod- or tubular-shaped strength members for resisting bending and axial forces acting on the support structure 10, and are used in a vertical orientation. The outer pillar 20 may be a single strength member, but may also be an assembly type divided into multiple pieces along the longitudinal direction. For practical purposes, a known single pipe can be used for the outer pillar 20.

[0017] <1.1> Total length of outer pillar The overall length of the outer pillar 20 is appropriately selected to match the overall length of the pillar structure 10. In this example, a configuration in which all the outer columns 20 have the same overall length will be described.

[0018] <1.2> Spacing of exterior columns The multiple outer columns 20 are arranged at equal intervals and in parallel with one another.

[0019] <1.3> Number of exterior column combinations The support structure 10 comprises a plurality of outer posts 20 . The outer columns 20 are one of the strength adjusting members of the support structure 10, and the number of outer columns 20 to be installed can be selected appropriately depending on the design strength of the support structure 10.

[0020] In this example, a form in which four outer columns 20 are used as one unit is described, but a combination of five or six outer columns 20 may also be used, and the key is that three or more outer columns 20 can be used as one unit.

[0021] <2> restraint board The following description will be given with reference to Figures 2, 4 and 5. The restraining plate 30 is one of the strength adjusting members of the support structure 10, and the number of restraining plates 30 to be installed is appropriately selected according to the design height of the support structure 10.

[0022] The restraint plate 30 is a stress member that has both the function of restraining the multiple outer columns 20 so that they do not deform in the radial expansion direction and buckle, and the function of transmitting loads between the multiple outer columns 20.

[0023] The restraint plate 30 has a peripheral portion formed with a plurality of post holes 31 and a plurality of fitting slits 32 at predetermined intervals.

[0024] <2.1> Column hole The post holes 31 are holes for inserting the outer posts 20, and are formed at equal intervals on the plate surface of the peripheral edge of the restraint plate 30. The number of post holes 31 formed can be appropriately selected depending on the number of outer posts 20 to be installed.

[0025] <2.2> Fitting slit The fitting slits 32 are openings for fitting hooks 42 formed on the upper and lower ends of the brace material 40. By fitting the hook portion 42 at the end of the brace material 40 into the mating slit 32, the restraint plate 30 and the brace material 40 can be connected and fixed.

[0026] <2.2.1> Position of fitting slit A fitting slit 32 is formed in the peripheral portion of the restraint plate 30 on the plate surface between a pair of adjacent post holes 31, 31. The fitting slit 32 may be formed to match the fitting position of the hook portion 42 at the end of the brace material 40.

[0027] <2.2.2> Fitting slit opening dimensions The opening dimensions of the fitting slit 32 are formed to a shape and size capable of receiving the hook portion 42 of the brace material 40 . In this example, the fitting slit 32 has a rectangular shape corresponding to the cross-sectional shape of the plate-like brace material 40 . The fitting slit 32 may be formed narrow so as to accommodate only a single hook portion 42 of the brace material 40, or may be formed wide so as to accommodate a plurality of hook portions 42 together.

[0028] <2.3> Planar shape of the restraining plate In this embodiment, as shown in FIG. 4, a configuration in which the restraint plate 30 is configured as a single flat plate will be described. The planar shape of the restraint plate 30 may be a square, polygon, circle, or the like, and there are no particular limitations on the planar shape of the restraint plate 30.

[0029] The restraint plate 30 is not limited to a flat plate, but may be a combination of band-shaped link members that can individually connect a pair of outer columns 20 together. When the restraining plate 30 is constructed of a plurality of link members, post holes 31 are formed at both ends of the link members, and fitting slits 32 are formed near both ends of the link members.

[0030] <2.4> Positioning means for restraining plate The following description will be given with reference to FIG. Each restraint plate 30 is positioned by a positioning means 21 in a state where it cannot move along the height direction of the outer column 20.

[0031] As the positioning means 21 for the restraining plate 30, for example, a single pipe clamp, a spring clip material with a C-shaped cross section, or a pin structure can be used. When the positioning means 21 is a single pipe clamp or a spring clip material, it is attached to the outer peripheral surface of the outer pillar 20 at the upper and lower positions of the restraining plate 30 to position the restraining plate 30. When the positioning means 21 has a pin-fastening structure, a pin member is combined with a plurality of pin holes opened along the axial direction of the outer column 20, and the restraint plate 30 is positioned by inserting the pin member into the pin hole aligned with the positioning position.

[0032] As another positioning means 21 for the restraint plate 30, the diameter difference between the post hole 31 and the outer post 20 may be made small, and the outer post 20 may be fitted into the post hole 31 so that the outer post 20 is in pressure contact with the post hole 31, and positioning may be performed by utilizing the frictional resistance of the pressure contact portion.

[0033] <3> Breathing material The following description will be given with reference to Figures 2, 4 and 5. The brace material 40 is one of the strength adjusting members of the support structure 10, and the number of brace materials 40 to be installed can be selected appropriately depending on the design strength of the support structure 10. The brace material 40 functions as a stress member that vertically connects adjacent restraint plates 30, 30 together.

[0034] Regarding the brace 40 illustrated in this embodiment, the brace 40 comprises a pair of bending frames 41, 41 and a connecting pin 45 that connects the bending portions of the bending frames 41, 41. The brace material 40 is constructed in an assembled form in order to facilitate the assembly work of the brace material 40 between adjacent restraint plates 30, 30 vertically.

[0035] <3.1> Bending frame Description will be given with reference to FIG. The pair of bending frames 41, 41 have the same structure and shape. The bent frame 41 is made of a plate having an overall "L" shape. The bending angle of the bending frame 41 is appropriately selected in accordance with the arrangement interval between the restraining plates 30, 30 arranged above and below. Inwardly protruding hooks 42 are formed on both ends of the bent frame 41. The hooks 42 can be fitted into the fitting slits 32 of the restraint plate 30. The bent frame 41 has a pin hole 43 at the central bent portion.

[0036] <3.2> Connecting pin The connecting pin 45 is a pin for integrating the pair of bending frames 41, 41 together. The brace material 40 can be assembled into an X shape by inserting a connecting pin 45 into a pin hole 43 at the bent portion of a pair of overlapping bent frames 41, 41.

[0037] <3.3> Dimensions of the brace material The height of the brace material 40 can be selected as appropriate. The brace members 40 may all be of the same dimensions assembled to one support structure 10, or brace members 40 of different heights (total lengths) may be assembled to one support structure 10. By changing the height (total length) of the brace material 40, the spacing between each load-bearing section 11 formed in the support structure 10 can be adjusted.

[0038] <4> Ancillary Facilities As ancillary equipment for the support structure 10, for example, a spacing retaining material (not shown) may be arranged between the heads of adjacent support structures 10, or a backing rope material (not shown) may be arranged between a mountain side anchor provided on the mountain side of the slope and the head of each support structure 10. In addition, ancillary equipment including a known protective fence may be installed. These auxiliary facilities are examples only and are not required facilities.

[0039] 3. Blocking surface Explained with reference to Figures 1 to 3, blocking surface 50 is a known flexible debris capture surface. The blocking surface 50 is disposed on the slope mountain side or slope valley side of the support structure 10 and is installed across a plurality of adjacent support structures 10.

[0040] <1> Example of blocking surface In this example, a form in which the blocking surface 50 is constructed from a plurality of steel or fiber rope materials 51 arranged in multiple stages and a steel or fiber net material 52 arranged on one side of the plurality of rope materials 51 is described, but the blocking surface 50 may be constructed from either the rope material 51 or the net material 52. The specific configuration of the blocking surface 50 is appropriately selected depending on the type and amount of collapsed object to be captured.

[0041] <2> When the blocking surface is equipped with rope material When the blocking surface 50 is provided with a rope material 51, a known shock-absorbing metal fitting may be provided on a part of the rope material 51, or the rope material 51 may be attached in a form not including a shock-absorbing device. Furthermore, the intersection of the rope material 51 and the support structure 10 may be attached non-slidably by a bolt or the like, or may be attached by mooring so as to be slidable.

[0042] [How to assemble the support structure] A method for assembling the support structure 10 will now be described.

[0043] <1> Delivery of materials The outer columns 20, restraint plates 30 and bracing materials 40 that make up the support structure 10 are transported to the site. Since all of the stress members that make up the support structure 10 are lightweight, the materials can be divided into small pieces and transported to the site by workers alone, without the need for large transport vehicles, etc.

[0044] <2> On-site assembly of support structure The support structure 10 is assembled on-site in the following manner. The support structure 10 may be assembled either horizontally or vertically.

[0045] <2.1> Restriction plate assembly process Description will be given with reference to FIG. The outer columns 20 are assembled by bridging the plurality of restraining plates 30 while inserting one end of each of the outer columns 20 into the column holes 31 of the restraining plates 30 arranged opposite to each other.

[0046] <2.2> Brass material assembly process The following description will be given with reference to FIGS. In a state where the structure is moored to a plurality of outer pillars 20, a brace material 40 is assembled between the vertically adjacent restraining plates 30, 30. When assembling the bent frames 41 individually, the hook portions 42 at the ends of each bent frame 41 are fitted into the mating slits 32 of the restraint plate 30, and then a connecting pin 45 is inserted into the bent portions of a pair of bent frames 41, 41, allowing the engagement work to the restraint plate 30 and the assembly work of the brace material 40 to be performed simultaneously. Alternatively, a completed brace member 40 that has been preassembled into an X shape may be attached between two upper and lower restraining plates 30, 30.

[0047] When setting the brace material 40, the positioning means 21 is used to position the restraint plate 30 at a predetermined position on the outer column 20 so that it cannot be displaced.

[0048] <2.3> Repeating the process The process of assembling the restraining plates 30 to the outer columns 20 and the process of assembling the braces 40 between adjacent restraining plates 30, 30 are repeated until the specified design height is reached, completing the assembly work of the pillar structure 10.

[0049] When assembling the support structure 10, the height of the support structure 10 can be adjusted to a design height according to the installation location by selecting the number of restraint plates 30 and brace materials 40 to be installed.

[0050] Since no welding or large heavy machinery is used to assemble the support structure 10, the support structure 10 can be manufactured in a short period of time. For example, when manufacturing a column structure 10 having a height of 2 m, it can be assembled by one worker in a short work time of about 15 to 20 minutes.

[0051] <3> Adjusting the strength of the support structure The support structure 10 according to the present invention allows for easy strength adjustment on-site. A method for adjusting the strength of the column structure 10 will now be described.

[0052] <3.1> Strength adjustment using outer columns The strength of the support structure 10 can be adjusted by selecting the number of outer columns 20 that make up the support structure 10. The strength of the pillar structure 10 increases in proportion to the number of outer pillars 20 installed.

[0053] Another method for strengthening the support structure 10 is to increase the diameter of the outer columns 20. However, increasing the diameter of the outer columns 20 not only makes the outer columns 20 heavier and less easy to handle, but also requires changes to the column holes 31 of the restraint plates 30. As a result, material management and differentiation between larger-diameter stress members (outer columns, restraining plates) and non-large-diameter stress members (outer columns, restraining plates) becomes complicated. In order to solve this problem, the present invention makes it possible to adjust the strength of the support structure 10 by selecting the number of outer columns 20 to be installed.

[0054] <3.2> Strength adjustment using bracing materials The strength of the support structure 10 can also be adjusted by selecting the number of braces 40 that make up the support structure 10. For example, the brace material 40 may be assembled singly, or multiple sets of brace materials 40 may be assembled in a stacked state. The strength of the support structure 10 increases in proportion to the number of braces 40 installed.

[0055] In addition, the support structure 10 can have the same strength throughout its entire length by installing the same number of brace materials 40 in all load-bearing sections 11, and it is also possible to partially reinforce load-bearing sections 11 of any height by selecting the number of brace materials 40 installed.

[0056] As described above, in the present invention, when assembling the support structure 10, the overall length and strength (bending strength, axial force, shear force) of the support structure 10 can be individually adjusted to suit the site by the simple task of appropriately selecting the number of stress members to be installed.

[0057] <4> Erection of the support structure The support structures 10 manufactured by the process described above are erected at the installation site of the protective fence at a specified interval. An example of erecting the support structure 10 will be described below.

[0058] <4.1> Support method for column structure using steel foundation The following description will be given with reference to FIG. A tower-structured steel foundation 60 may be constructed at the installation position of the support structure 10, and the support structure 10 may be erected directly above the steel foundation 60. The steel foundation 60 is composed of a plurality of support piles 61 driven into the ground and a plurality of support poles spanning between the heads of the support piles 61. The support piles 61 and girders 62 may be made of commercially available single pipes, steel sections, column materials, etc.

[0059] <4.2> Direct installation method for pillar structure Although not shown in the drawings, the lower portion of the support structure 10 may be erected directly into a concrete foundation or the natural ground.

[0060] <5> Installation of spacing retaining materials If necessary, steel spacing members are installed horizontally between the heads of adjacent support structures 10. As the spacer, a single pipe, a steel pipe, etc. can be used. The ends of the spacer are secured to the head of the support structure 10 by known bolt connections.

[0061] <6> Installation of mountain side support ropes If necessary, a mountain side anchor is constructed on the slope mountain side of the support structure 10, and a mountain side back rope is installed between the head of the support structure 10 and the mountain side anchor.

[0062] [Load-bearing effect of support structure] Next, the load-bearing effect of the support structure 10 when the protective fence is hit will be described with reference to FIGS.

[0063] <1> Bending strength of support structure When a bending force acts on the support structure 10 through the blocking surface 50, the outer column 20, the restraining plate 30 and the brace member 40 that constitute the support structure 10 work together to resist the bending force. In particular, each load-bearing section 11 of the support structure 10 has a rigid frame structure, and therefore resists rotation and bending. In particular, even if the overall length of the outer column 20 is long, the multiple restraint plates 30 restrain and reinforce the intermediate portions of the outer column 20, making it difficult for the outer column 20 to buckle. Furthermore, the multiple braces 40 provided on the outer periphery of the support structure 10 cooperate with the outer columns 20 to resist bending and tensile forces, thereby reducing the load on the outer columns 20. When the external force exceeds the design strength of the support structure 10, plastic deformation occurs in the outer columns 20 and the brace material 40, and the bending force is absorbed as the outer columns 20 and the brace material 40 deform.

[0064] <2> Repair work on the support structure The support structure 10 is of a prefabricated type. Therefore, when repairing the protective fence after an attack, the support structure 10 can be easily repaired by replacing only the deformed constituent materials of the support structure 10 (exterior columns 20, restraining plates 30 or bracing materials 40) with new materials.

[0065] [Other Examples] Other embodiments will be described below. In the description, the same parts as those in the above-mentioned embodiment will be given the same reference numerals and detailed description thereof will be omitted.

[0066] <1> Other reinforcing structures for the support structure In the previous embodiment, a form was described in which the number of outer columns 20 and brace members 40, which are the stress members that constitute the support structure 10, are installed in the same manner in all load-bearing sections 11. However, the number of stress members installed in a specific load-bearing section 11 may be increased to provide partial reinforcement.

[0067] <2> Examples of partial reinforcement Regarding the reinforcing structure illustrated in Figures 7 and 8, the lower half of the support structure 10 is reinforced by increasing the number of outer columns 20 and brace materials 40 installed.

[0068] The stress members may be increased in number on either the outer columns 20 or the braces 40. The number of the outer columns 20 may be changed stepwise along the height direction (stacking direction) of the support structure 10.

[0069] By gradually increasing the number of stress members installed from the top to the bottom of the support structure 10, the strength of the support structure 10 can be gradually increased from the top side to the bottom side. In short, in order to partially reinforce the section where the bending force acting on the support structure 10 is large, the number of stress members installed is increased compared to other sections.

[0070] <3> Effects of this Example In this example, in addition to the effects of the previous embodiments, the strength can be adjusted (changed) as desired along the height direction (stacking direction) of the support structure 10 simply by selecting the number of stress members of the same type to be installed.

[0071] [Variations] A modification of the previous embodiment will now be described with reference to Figures 9 and 10.

[0072] <1> Modifications of the support structure In this embodiment, a modified example of the support structure 10 in which the planar shape of the restraining plate 30 is formed into a disk shape will be described. A plurality of post holes 31 and a plurality of fitting slits 32 are formed along the circumferential direction of the restraint plate 30, similarly to the previously described embodiment.

[0073] In this example, a plurality of reinforcing post holes 31a, 31a may be formed along the centripetal direction on the peripheral surface of the restraining plate 30 at the 12 o'clock, 3 o'clock, 6 o'clock, and 9 o'clock positions, expressed in clock notation. Further, the restraint plate 30 may be configured so that a plurality of post holes 31 are formed in a plurality of concentric circular rows. <2> Effects of this Example In this example, in addition to the effects of the previous embodiments, the bending strength of the pillar structure 10 can be increased by additionally providing outer pillars 20 in the reinforcing pillar holes 31a, 31a, so that the pillar structure 10 can effectively resist external forces acting in the direction of the slope or in a direction perpendicular to the slope when an attack is received. [Explanation of symbols]

[0074] 10... Support structure 20...Outer pillar 21. Positioning means 30...Restriction plate 31 Post hole 32...Mating slit 40...Breath material 41...Flexible frame 42...Hook part 43 Pin hole 50...blocking surface 51 Rope material 52 Net material 60... Steel foundation 61...Support pile 62...Girder material

Claims

1. A protective fence comprising at least support structures erected at intervals and a blocking surface formed between adjacent support structures for capturing falling objects such as falling rocks, collapsed soil, and avalanches, The support structure includes a plurality of spaced apart exterior columns arranged vertically; A plurality of restraint plates are arranged in multiple stages across the plurality of outer columns and connect the plurality of outer columns in a load-transmitting manner; A plurality of braces are arranged vertically and connect adjacent restraint plates vertically so as to be able to transmit loads between them. A plurality of rigid frame load-bearing sections are formed along the height direction in accordance with the installation intervals of the restraint plates, The outer column is a stress member having a length spanning a plurality of load-bearing sections; The strength of the support structure can be changed by selecting the number of the outer columns, restraining plates, and braces that are stress members; the blocking surface comprises at least one of a steel or textile rope material or a steel or textile netting material; The outer column of the support structure and the blocking surface are attached at an intersection so as to be capable of transmitting a load. Protective fence.

2. The protective fence described in claim 1, characterized in that the plate surface of the restraint plate is formed with three or more post holes through which the outer columns can be passed, and a plurality of fitting slits into which the upper and lower ends of the brace can be fitted, and the number of stress members of at least one of the outer columns or brace members to be assembled can be selected depending on the design strength.

3. The protective fence described in claim 2, characterized in that in all load-bearing sections formed along the height direction, the number of at least one stress member of the outer columns or brace members which are stress members is installed in an equal number of combinations.

4. The protective fence described in claim 2, characterized in that in multiple load-bearing sections formed along the height direction, the number of at least one stress member of the outer columns or brace members which are stress members is installed in different combinations.

5. 2. The safety fence according to claim 1, wherein the outer posts are single-tube pipes.

6. 2. The safety fence according to claim 1, further comprising a restraining plate positioning means for immovably positioning the restraining plate relative to the outer post.

7. 2. The safety fence according to claim 1, wherein the brace material comprises a pair of bent frames and a connecting pin that connects the bent portions of the bent frames.

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