Elevation structure of support columns

Abstract

To provide a support column erection structure that allows for efficient and low-cost erection of support columns, eliminates bending moments on the support columns during impact, and enables economical production of the support columns. [Solution] The system comprises a support column body 20 and a tilting joint device 30 that supports the support column body 20 so that it can be tilted in the circumferential direction. The tilting joint device 30 comprises a base cylinder 31 that supports the lower part of the support column body 20 so that it can rotate in the circumferential direction, an upper crossbeam 36 that is inserted into and anchored to the lower part of the support column body 20, a lower crossbeam 37 that is inserted into and anchored to the upper part of the base cylinder 31, and a connecting member 38 that connects the upper crossbeam 36 and the lower crossbeam 37 in the vertical direction. The support column body 20 and the base cylinder 31 are inseparably connected by a link mechanism of the upper crossbeam 36, the lower crossbeam 37 and the connecting member 38, while the support column body 20 is supported by the base cylinder 31 so that it can rotate.

Description

Technical Field

[0001] The present invention relates to an erection structure of a column structure erected so as to be tiltable in all circumferential directions.

Background Art

[0002] The column main body constituting the column structure is made of a rigid material such as a steel pipe, a concrete-filled steel pipe, or an H-shaped steel, and appropriate steel materials are selectively used according to the bending strength required for the column main body.

[0003] As an erection structure of a column structure, Patent Document 1 discloses an embedded column structure in which the lower part of the column main body is buried in the ground, and Patent Document 2 discloses a grounded column structure in which a grounding plate provided at the lower part of the column main body is grounded on the ground surface without being embedded in the ground. Patent Document 3 discloses that the lower part of the column main body is configured as a hinge structure, and the column main body is configured to be tiltable toward the valley side through the hinge structure.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0005] The conventional embedded column structure has the following problems. <1> At the time of impact, axial force, shear force, and bending force act on the column main body. Therefore, in order for the column main body to withstand these external forces, it must be manufactured with high strength, resulting in a high column cost. <2> In a fixed-post support structure, it is necessary to ensure a long buried length of the support post itself in order to obtain reaction force from the ground. For example, if a protective fence is 3 meters high and the supporting ground is soft, the length of the support posts must be buried in the ground for about 4 meters, making the total length of the support posts 7 meters. <3> As the overall length of the support column increases, not only does the transportability of the support structure worsen, but it also necessitates the installation of work platforms and the introduction of large boring machines, resulting in increased time and cost for the support column erection work.

[0006] Conventional support structures, which use a hinge structure at the lower part of the main support column, have the following inherent problems. <1> In the case of a single-axis hinge structure, the direction in which the support column can tilt is limited to the direction of the slope (from the mountain side to the valley side), and tilting in any direction other than the axis of the support column is not possible. <2> In the case of a single-axis hinge structure, if an external force is applied in a direction that prevents the support structure from tilting, the hinge structure will be destroyed and the support structure will lose its function.

[0007] The present invention has been made in view of the above points, and its objective is to provide a support structure that allows the support body to be erected efficiently and at low cost, and eliminates bending moments on the support structure when subjected to impact, thereby enabling the economical manufacture of the support body. [Means for solving the problem]

[0008] The present invention relates to an erection structure for a support column, in which the top of the support column body is supported by one or more bracing ropes, comprising: a support column body made of steel pipe; a tilting joint device provided at the lower part of the support column body, which supports the support column body so that it can tilt in one direction or in a circumferential direction; the tilting joint device having its lower end in contact with the ground, and comprising a steel pipe foundation cylinder that supports the lower part of the support column body so that it can rotate in one direction or in a circumferential direction; an upper crossbeam inserted and anchored inside the lower part of the support column body; a lower crossbeam inserted and anchored inside the upper part of the foundation cylinder; and a connecting member that connects the upper crossbeam and the lower crossbeam in the vertical direction, wherein the support column body and the foundation cylinder are irremovably connected by a link mechanism of the upper crossbeam, the lower crossbeam and the connecting member, and the support column body is rotatably supported by the foundation cylinder. In another embodiment of the present invention, a convex joint surface having an arc-shaped cross-section perpendicular to the circumference is formed on either the lower part of the support column body or the upper part of the foundation cylinder, and a concave joint surface corresponding to the convex joint surface is formed on either the lower part of the support column body or the upper part of the foundation cylinder. In another embodiment of the present invention, the upper crossbeam consists of one or more intersecting rod-shaped beam members that penetrate and anchor to the lower part of the support column body, and the upper part of the connecting member is connected to the center of the beam members so as to be rotatable in the entire circumference of the support column. In another embodiment of the present invention, the lower crossbeam consists of one or more intersecting rod-shaped beam members that penetrate and anchor through the upper part of the foundation cylinder, and the lower part of the connecting member is connected to the center of the beam members. In another embodiment of the present invention, the tilting joint device further comprises a base plate having an opening in the center, and the base plate is integrally provided at the lower end of the foundation cylinder. In another embodiment of the present invention, a reinforcing thickened portion is formed by attaching a separate steel material to the end of a steel pipe constituting the main support column or a steel pipe constituting the foundation cylinder, and a convex joint surface or a concave joint surface is extended and formed on the end surface of the reinforcing thickened portion. In another embodiment of the present invention, the support body is one of the following: a support for a rockfall protection fence, a chimney made of steel pipe, or a utility pole made of steel pipe. [Effects of the Invention]

[0009] The present invention provides at least one of the following effects. <1> This system allows for the erection of the support structure without burying it in the ground, and enables the assembly of the tilting joint device and the support structure to be carried out simultaneously. Therefore, the support structure can be erected efficiently and at low cost. <2> A tilting joint device is provided at the lower part of the support column body, and the support column body is configured to be supported so that it can tilt in all directions, thus allowing the support column body to tilt in all directions when subjected to impact. Therefore, although axial and shear forces act on the support structure, no bending moment acts on the lower part of the support itself. Therefore, it becomes unnecessary to design the support column body and tilting joint device with high strength to account for bending moments, allowing the support column structure to be manufactured economically. <3> The upper and lower crossbeams and connecting members of the tilting joint device function as a link mechanism with a spacing-maintaining function, thereby maintaining the connection between the lower part of the support body and the tilting joint device. Therefore, the support column body can be tilted while maintaining a good connection between the lower part of the support column body and the tilting joint device. <4> Since the connecting member and the upper crossbeam are connected in a way that allows for rotation, even if the main support column tilts, no bending force is applied to the connection between the upper part of the connecting member and the upper crossbeam. Therefore, the rotational resistance of the tilting joint device is reduced when the support column itself tilts. <5> By securing both ends of the beam material constituting the upper or lower crossbeam to positioning holes in the column body or foundation cylinder, and by rotatably connecting the upper crossbeam to the upper part of the connecting member, it is possible to allow the column body to tilt while avoiding stress acting on the connection between the crossbeam and the connecting member when the column body tilts. <6> When using multiple beam members intersecting each other as upper or lower crossbeams, the multiple beam members constituting the crossbeam can be anchored in a state where they are centered at the center of the support body or foundation cylinder. Therefore, the connecting members can be positioned along the axis of the main support column and the foundation cylinder. <7>It is possible to reinforce the convex joint surface or the concave joint surface while expanding to an arbitrary width (area) by utilizing a reinforcing and thickening portion formed at the end of the steel pipe constituting the column body or the steel pipe constituting the foundation cylinder. Therefore, even if the steel pipe constituting the column body or the foundation cylinder is thin, it is possible to form by expanding the area of the convex joint surface or the concave joint surface without being affected by the thickness of the steel pipe.

Brief Description of the Drawings

[0010] [Figure 1] Explanatory drawing of applying the column structure to a guardrail [Figure 2] Exploded assembly drawing of the tilting joint device according to Example 1 [Figure 3] Cross-sectional view of the lower part of the column body with the tilting joint device assembled [Figure 4] Cross-sectional view taken along line IV-IV in Figure 3 [Figure 5A] Explanatory drawing of the assembly method of the upper half of the tilting joint device [Figure 5B] Explanatory drawing of the assembly method of the tilting joint device [Figure 5C] Explanatory drawing when the column body is tilted [Figure 6] Partial enlarged view of the tilting joint device according to Example 2

Modes for Carrying Out the Invention

[0011] The present invention will be described in detail below with reference to the drawings.

[0012] [Example 1] 1. Application Target of the Column Structure The column structure 10 can be applied to, for example, a steel pipe column for a guardrail, a steel pipe electric pole, a steel pipe chimney, etc. In this example, a form in which the column structure 10 is applied to a guardrail will be described.

[0013] <1> Guardrail The protective fence illustrated in Figure 1 comprises at least a plurality of support structures 10 erected at intervals from each other, and a strip-shaped protective net 50 stretched between adjacent support structures 10.

[0014] <2> Protective net The protective net 50 is a known capture net for receiving loads such as falling rocks, and is formed from either a metal or fiber rope material 51 or a metal or fiber net material 52, or a combination of both of these members 51 and 52. If the protective net 50 includes rope material 51, the rope material 51 only needs to be stretched between adjacent support structure 10, and the number and position of the rope material 51 can be selected as appropriate. Furthermore, the protective net 50 also includes a form in which rope material 51 is looped to form a chain structure of multiple ring bodies. The protective net 50 also includes a configuration in which a known buffer device is interposed in a portion of the rope material 51.

[0015] The net material 52 is, for example, a metal net such as wire mesh with a square mesh pattern, or a fiber net.

[0016] 2. Support structure The support structure 10 comprises a support body 20 made of steel pipe and a tilting joint device 30 provided at the lower part of the support body 20, which supports the support body 20 so that it can be tilted in all directions.

[0017] <1> Support post body The support column body 20 is a steel pipe (for example, 240-300 mm in diameter) with a circular or similar cross-sectional shape, and has sufficient strength to support the protective net 50.

[0018] The support column body 20 is not limited to a single piece, but may be composed of multiple segmented support column bodies. When the support column body 20 is composed of multiple segmented support column bodies, flanges are provided at the ends of each segmented support column body, and the flanges that meet are joined together by fastening them with bolts. By constructing the support column body 20 from multiple segmented support column bodies, the support column body 20 can be efficiently transported to the site and installed even when the cross-sectional diameter of the support column body 20 is large or the total length of the support column body 20 is long.

[0019] The outer circumference of the support column body 20 is provided with hook elements and bracket elements for attaching protective nets 50, retaining ropes, etc.

[0020] A tapered, convex joint surface 21 is formed at the lower part of the support column body 20. Details of the convex joint surface 21 will be described later.

[0021] <2> Tilting joint device Please refer to Figures 2 and 3 for further explanation. The tilting joint device 30 comprises a foundation cylinder 31 that rotatably supports the lower part of the support column body 20, a base plate 33 integrally provided at the lower end of the foundation cylinder 31, an upper crossbeam 36 inserted into and anchored to the lower part of the support column body 20, a lower crossbeam 37 inserted into and anchored to the upper part of the foundation cylinder 31, a connecting member 38 that penetrates vertically between the two crossbeams 36 and 37 and connects them, and nut elements 39a and 39b that are screwed onto the upper and lower ends of the connecting member 38.

[0022] The tilting joint device 30 is interposed at the lower part of the support column body 20 in order to apply only axial force and shear force to the lower part of the support column body 20, and to prevent bending moment from being applied to the lower part of the support column body 20.

[0023] <2.1> Basic tube The foundation tube 31 is a short-span steel pipe (with a diameter of, for example, 240-300 mm and an overall length of, for example, 200-400 mm) that works in conjunction with the base plate 33 to support the main support column 20. A concave joint surface 31 is formed on the upper part of the foundation cylinder 31. Details of the concave joint surface 31 will be described later.

[0024] <2.2> Base Plate The base plate 33 is a rectangular plate that rests on the ground and supports the main support column 20 and the foundation cylinder 31, and its size is larger than that of the foundation cylinder 31. The lower end of the foundation cylinder 31 is placed on the upper surface of the base plate 33 and is integrally fixed to it by welding or the like.

[0025] A circular opening 33a is provided in the center of the base plate 33, allowing a hand to be inserted into the foundation cylinder 31 to perform the connection work between the support column body 20 and the foundation cylinder 31. Multiple holes are provided in the peripheral edge of the base plate 33 so that it can be fixed with anchor pins or the like.

[0026] <3> Joint surface between the support column body and the foundation cylinder The lower part of the support column body 20 and the upper part of the foundation cylinder 31 are joined by a convex joint surface that is curved in an arc shape and a concave joint surface that is curved in an arc shape corresponding to the convex joint surface. In this example, a configuration is described in which a convex joint surface 21 is provided on the main support column 20 side and a concave joint surface 31 is provided on the foundation cylinder 31 side. However, the combination of the objects on which the convex joint surface 21 and the concave joint surface 31 are provided may be reversed.

[0027] <3.1>Convex joint surface The lower part of the support column body 20 forms a convex joint surface 21 with a cross-section perpendicular to the circumference and shaped like an arc. The convex joint surface 21 is a tapered spherical surface exhibiting an annular shape, and is formed as a curved surface that bulges outward. In other words, the convex joint surface 21 has an inner circumferential surface that extends longer in the axial direction than the outer circumferential surface, and is formed by curving between the inner and outer circumferential surfaces.

[0028] <3.2>Concave joint surface A concave joint surface 31 is formed at the upper end of the steel pipe foundation cylinder 31. The concave joint surface 31 is an annular spherical surface, formed as a curved surface that is concave inward. In other words, the concave joint surface 31 has an outer circumferential surface that extends longer in the axial direction than the inner circumferential surface, and is formed as an inwardly recessed curved surface between the inner and outer circumferential surfaces.

[0029] <3.3> Relationship between the radius of curvature of the joint surface Refer to Figure 3 and write the command. In this example, we will describe a configuration in which the radii of curvature r of the convex joint surface 21 and the concave joint surface 31 are equal to each other. More specifically, the center O and radius of curvature r of both curved joint surfaces 21 and 32 are common. The radii of curvature r of both joint surfaces 21 and 32 can be selected as appropriate, but they should be larger than the diameter of the steel pipe constituting the support column body 20 or the foundation cylinder 32.

[0030] The relationship between the radii of curvature of the convex joint surface 21 and the concave joint surface 31 may be such that the radius of curvature of the concave joint surface 31 is larger than that of the convex joint surface 21.

[0031] The reason for setting the radii of curvature of each joint surface 21 and 31 to the relationship described above is to ensure a tight contact surface between the convex joint surface 21 and the concave joint surface 31 while allowing rotation.

[0032] <3.4> Method for forming protruding and receiving surfaces The curved surfaces of the convex joint surface 21 and the concave joint surface 31 can be easily processed by cutting or polishing. Since the convex joint surface 21 and the concave joint surface 31 can be formed by direct processing on the steel pipe, the effort of later attaching separate, independent joint surface elements to the ends of the steel pipe is eliminated. Therefore, a joint surface can be formed at low cost for the connection between the steel pipe support body 20 and the foundation cylinder 31.

[0033] <3.5> Relationship between the cross-sectional diameter and wall thickness of the support column body and the foundation cylinder The cross-sectional diameter and thickness of the steel pipes constituting the main support column 20 and the steel pipes constituting the foundation cylinder 31 can be selected as appropriate. In this example, we describe a configuration in which the cross-sectional diameter and thickness of the steel pipes constituting the main support column 20 and the steel pipes constituting the foundation cylinder 31 are both equal. However, the cross-sectional diameters of the upper and lower steel pipes may be different. In short, at the joint between the support column body 20 and the foundation cylinder 31, there should be a curved, uneven joint surface that allows the support column body 20 to rotate.

[0034] <4> Link mechanism equipped with a spacing maintenance function An upper crossbeam 36, a lower crossbeam 37, and a connecting member 38 constitute a link mechanism that has a spacing maintenance function. The link mechanism supports the column body 20 so that it can rotate with the base cylinder 31, and connects the joint between the column body 20 and the base cylinder 31, where the convex joint surface 21 and the concave joint surface 31 are joined, in a way that makes separation impossible.

[0035] <4.1> Upper crossbeam The upper crossbeam 36 is an internal reaction member that is anchored to the main support column 20 to obtain a reaction force. The upper crossbeam 36 consists of one or more intersecting rod-shaped beam members having a total length that can traverse the main support column 20. For the beam material constituting the upper crossbeam 36, for example, rods such as steel bars or cylindrical bodies such as steel pipes can be used. When the upper crossbeam 36 is composed of multiple beam members, the beam members may be of the same diameter or different diameters.

[0036] <4.1.1> Arrangement of upper crossbeams In this example, we will describe a configuration in which two beam members intersect in a cross shape to form the upper crossbeam 36. When multiple beam members are intersected to form an upper horizontal beam 36, the beam members are installed so that the outer surfaces of adjacent beam members touch each other and form nodes, allowing for the transfer of loads between them.

[0037] <4.1.2> Mooring structure of upper crossbeam Multiple pairs of positioning holes 20a are provided on the lower circumferential surface of the support column body 20, oriented in the diametrical direction. Two beam members constituting the upper horizontal beam 36 are inserted through these pairs of positioning holes 20a, 20a and attached. The ends of the beam members that make up the upper crossbeam 36 are simply anchored to the positioning holes 20a of the support column body 20. The reason why the ends of the beam members constituting the upper crossbeam 36 are not rigidly connected (fixed) to the positioning holes 20a of the support column body 20 is to prevent stress from being applied to the connection between the upper crossbeam 36 and the connecting member 38 when the support column body 20 tilts.

[0038] <4.1.3> Through holes in upper crossbeams A through-hole 36a is provided in the center of the beam material that makes up the upper crossbeam 36. The through-holes 36a in the upper beam members constituting the upper crossbeam 36 are formed to a uniform diameter, while the through-holes 36b in the lower beam members constituting the upper crossbeam 36 are formed as tapered holes (frustoconical holes) to allow for the oscillation of the connecting member 38.

[0039] <4.1.4> Hemispherical holes in upper crossbeams Furthermore, a mortar-shaped hemispherical hole 36c is provided above the through-hole 36a of the beam material located higher up. The reason for providing a hemispherical hole 36c in the uppermost beam member constituting the upper crossbeam 36 is to allow the hemispherical nut element 39a, described later, to rotatably accommodate the hole, thereby facilitating rotation at the connection between the upper crossbeam 36 and the upper part of the connecting member 38. Furthermore, the diameters of the through holes 36a and 37a in both crossbeams 36 and 37 are set to allow for rotation of the connecting member 38, with a margin of safety relative to the diameter of the connecting member 38.

[0040] <4.2> Lower crossbeam The lower crossbeam 37 is an internal reaction member that is anchored to the foundation cylinder 31 to obtain a reaction force. The lower crossbeam 37 consists of one or more intersecting rod-shaped beam members having a total length that can traverse the foundation cylinder 31. For the beam material constituting the lower crossbeam 37, for example, rods such as steel bars or cylindrical bodies such as steel pipes can be used. When the lower crossbeam 37 is composed of multiple beam members, the beam members may be of the same diameter or different diameters.

[0041] <4.2.1> Arrangement of lower crossbeams In this example, we will describe a configuration in which two beam members intersect in a cross shape to form a lower crossbeam 37. When multiple beam members are intersected to form a lower crossbeam 37, the beam members are installed so that the outer surfaces of adjacent beam members touch each other and form nodes, allowing the load to be transmitted between them.

[0042] <4.2.2> Mooring structure of lower crossbeam Multiple pairs of positioning holes 31a are provided on the upper circumferential surface of the foundation cylinder 31, oriented in the diametrical direction. Two beam members constituting the lower crossbeam 37 are inserted through these pairs of positioning holes 31a, 31a and attached. The ends of the beam members that make up the lower crossbeam 37 are simply anchored to the positioning holes 31a of the foundation cylinder 31. The reason why the ends of the beam members constituting the lower crossbeam 37 are not rigidly connected (fixed) to the positioning holes 31a of the foundation cylinder 31 is to prevent stress from being applied to the connection between the lower crossbeam 37 and the connecting member 38 when the main support column 20 tilts.

[0043] <4.2.3> Through holes in lower crossbeams A through-hole 37a is provided in the center of the beam material that constitutes the lower crossbeam 37.

[0044] <4.3>Connecting material The connecting member 38 is a connecting member that connects the upper crossbeam 36 and the lower crossbeam 37 in a manner that allows load to be transmitted.

[0045] <4.3.1> Examples of connecting materials In this example, a configuration in which the connecting member 38 is made of double-threaded bolts is described, but the connecting member 38 may include other known load-transmitting members.

[0046] <4.3.2> Nut element Nut elements 39a and 39b are screwed onto both ends of the connecting member 38, which passes through the through holes 36a, 36b, and 37a of the two crossbeams 36 and 37. The upper nut element 39a may consist of a nut and a hemispherical washer formed separately or integrally, or a nut with a spherical outer shape may be used. The lower nut element 39b can use a known hexagonal nut.

[0047] <5> Retaining rope The retaining ropes (not shown in the illustration) are one or more rope materials used to maintain the upright position of the support column body 20, and are stretched between the top of the support column body 20 and an anchor installed on the mountain slope. A buffer device may be installed in part of the retaining rope to absorb kinetic energy when the support column body 20 tilts.

[0048] [Assembly method for tilting joint device] Next, the assembly method of the tilting joint device 30 will be explained.

[0049] <1> Assembly of the upper crossbeam (Figure 5A) Two beam members constituting the upper crossbeam 36 are inserted from the outside into positioning holes 20a opened on the lower circumferential surface of the main support column 20, and are arranged in a cross shape. When installing the upper crossbeam 36, the through holes 36a made in the center of the two beam members that make up the upper crossbeam 36 are aligned on the same line.

[0050] <2> Assembly of the upper part of the connecting material (Figure 5A) Next, the connecting member 38 is inserted upward from below the main support column 20, and the upper part of the connecting member 38 is inserted through the through hole 36a formed at the intersection of the upper crossbeam 36. By inserting a connecting member 38 through the intersection of the upper crossbeams 36 which intersect in a cross shape, the two beam members constituting the upper crossbeams 36 are anchored in a state where they are centered at the center of the support column body 20.

[0051] After inserting the connecting member 38 through the intersection of the two beam members that make up the upper crossbeam 36, a hemispherical nut element 39a is screwed onto the upper part of the connecting member 38 that is exposed above the upper crossbeam 36, thereby connecting the upper end of the connecting member 38 to the upper crossbeam 36.

[0052] Since the bottom of the support column body 20 is open so that a worker's hand can be inserted inside the support column body 20, the upper crossbeam 36 and connecting members 38 can be easily set up through the bottom opening of the support column body 20.

[0053] <3> Assembly of the lower crossbeam (Figure 5B) Two beam members constituting the lower crossbeam 37 are inserted from the outside into positioning holes 31a opened on the circumferential surface of the foundation cylinder 31, thereby setting them in a cross shape. When installing the lower crossbeam 37, the through holes 37a made in the center of the two beam members that make up the lower crossbeam 37 are aligned on the same line.

[0054] <4> Joining of joint surfaces The lower part of the support column body 20 and the upper part of the foundation cylinder 31 are brought together, so that the convex joint surface 21 and the concave joint surface 31 are in contact with each other.

[0055] <5> Assembly of connecting members (Figure 3) When performing the joint work on both joint surfaces 21 and 31, the lower part of the connecting member 35 is inserted into the intersection of the lower crossbeam 37, and the nut element 39b is screwed onto the exposed part of the connecting member 35 that protrudes from the lower side of the lower crossbeam 37. The lower nut element 39b is tightened to stretch the connecting member 35 between the upper crossbeam 36 and the lower crossbeam 37, which are anchored to both ends of the connecting member 35. The tilting joint device 30 maintains the joint state between the convex joint surface 21 and the concave joint surface 31 by a link mechanism that has a spacing-holding function provided by the upper crossbeam 36, the lower crossbeam 37, and the connecting member 38.

[0056] In this invention, the assembly of the tilting joint device 30 and the assembly of the support structure 10 can be completed simultaneously by simply connecting the support body 20 and the foundation cylinder 31 via the upper crossbeam 36, the lower crossbeam 37, and the connecting member 30. Therefore, the support structure 10 can be assembled efficiently.

[0057] When installing the support structure 10, the base plate 33 of the tilting joint device 30 is set in contact with the ground surface and erected.

[0058] <6> Fixing of tilting joint device The tilting joint device 30 is positioned by fixing the base plate 33 with anchor pins (not shown) driven into the ground, or by connecting a pair of upper and lower positioning ropes, which are connected to the slope-mountain side anchor and the slope-valley side anchor, to a part of the foundation cylinder 31.

[0059] After fixing the tilting joint device 30 in the designated position and completing the erection work of the support structure 10, the protective net 50 is attached between each adjacent support column 10 to complete the protective fence.

[0060] [The tilting effect of the support column] Next, with reference to Figures 3 and 5C, we will explain the tilting action of the support structure 10 when subjected to impact.

[0061] <1> Impact on protective net When falling rocks or other debris collide with the protective net 50, the protective net 50 deforms toward the slope valley side.

[0062] <2> Tilt force transmitted to the support column As the protective net 50 deforms toward the valley side of the slope, a tilting force is transmitted to the support structure 10, and this tilting force acts as a tilting force on the support body 20.

[0063] <3> tilting of the support column itself Since the support column body 20 is erected in a state that allows tilting in all directions (circumferentially) by interposing a tilting joint device 30, when a tilting force acts on the support column body 20, the support column body 20 tilts from the upright state in Figure 3 to the center O of the joint surfaces 21 and 31 of the tilting joint device 30, as shown in Figure 5C. When the main support column 20 tilts, the foundation cylinder 31 does not displace.

[0064] <3.1> Rotation axis of the support column The tilting action of the tilting joint device 30 will be explained in detail with reference to Figure 5C. The tilting joint device 30 has a structure in which the convex joint surface 21 at the bottom of the support column body 20 and the concave joint surface 32 at the top of the foundation cylinder 31 are in close contact with each other through a curved surface. Therefore, when a tilting force acts on the support column body 20, the support column body 20 rotates around the center O of the arc-shaped surface where the convex joint surface 21 and the concave joint surface 32 are in contact as the axis of rotation. Thus, in this invention, tilting of the support column body 20 can be permitted in all directions simply by attaching the tilting joint device 30 to the lower part of the support column body 20.

[0065] <3.2> Tilt force acting on the support structure The tilting force is transmitted to the support structure 10 through the protective net 50. By providing a pivot-structured tilting joint device 30 at the lower part of the support column body 20, when impact occurs, axial force and shear force act on the support column body 20, but no bending moment acts on the lower part of the support column body 20. Therefore, it becomes unnecessary to design the support column body 20 and the tilting joint device 30 with high strength that takes bending moments into consideration.

[0066] <3.3> Retention action of the joint surface When the support column body 20 tilts relative to the tilting joint device 30, there is a risk that the joint surfaces 21 and 31 of the tilting joint device 30 will separate and the contact state will be lost. However, the tilting joint device 30 maintains the contact state of the joint surfaces 21 and 31 of the tilting joint device 30 through a link mechanism equipped with a spacing-holding function using an upper crossbeam 36, a lower crossbeam 37, and a connecting member 38.

[0067] The holding function of the joint surfaces 21 and 31 of the tilting joint device 30 will be explained in detail below. An upper crossbeam 36, located at the lower part of the main support column 20, and a lower crossbeam 37, located at the upper part of the foundation cylinder 31, are connected by a connecting member 38, maintaining a constant distance between them. Therefore, even when tension is applied to the connecting member 38, the strength of the connecting member 38 is superior to the tension, allowing the rotation of the support column body 20 while maintaining the contact state of the joint surfaces 21 and 31 of the tilting joint device 30.

[0068] <3.4> Rotational resistance of tilting joint device As the main support column 20 tilts, a bending force acts on the connection between the upper part of the connecting member 38 and the upper crossbeam 36. Since the tilting joint device 30 is rotatably connected between the connecting member 38 and the upper crossbeam 36, the pivot point of the support column body 20 does not shift even if the support column body 20 tilts. Even if the connecting member 38 were to tilt, the connection between the upper part of the connecting member 38 and the upper crossbeam 36 would rotate, so no bending force would act on the connection between the upper part of the connecting member 38 and the upper crossbeam 36. Therefore, the rotational resistance of the tilting joint device 30 is reduced when the support column body 20 is tilted.

[0069] Furthermore, it is anticipated that an excessive load will be applied to the connection between the upper part of the connecting member 38 and the upper crossbeam 36 when the main support column 20 tilts. In this invention, the upper part of the connecting member 38 and the upper crossbeam 36 are rotatably connected, so even if the main support column 20 tilts, no excessive load is placed on the connection between the connecting member 38 and the upper crossbeam 36. Therefore, the connecting member 38 can maintain a nearly vertical position while allowing the support column body 20 to tilt.

[0070] [Example 2] Other embodiments will be described below, but in that description, the same parts as in Embodiment 1 will be denoted by the same reference numerals, and their detailed descriptions will be omitted.

[0071] <1> means for expanding the joining surface Referring to Figure 6, the means for increasing the thickness of both joining surfaces 21 and 31 will be described. To increase the area between the convex joint surface 21 and the concave joint surface 31, separate steel material (steel plate or steel pipe) is attached to the ends of the steel pipes constituting the support column body 20 and the foundation cylinder 31, and the attached steel material is integrally fixed to the steel pipe body by welding or other means to form reinforcing thickened sections 31b and 20b of the desired thickness.

[0072] By applying a curving process to the end of the steel pipe, including the thickened reinforcing sections 31b and 20b, a convex joint surface 21 or a concave joint surface 31 is formed.

[0073] In this example, we describe a configuration in which the ends of both the steel pipe for the support column body 20 and the steel pipe for the foundation cylinder 31 are thickened to expand the convex joint surface 21 and the concave joint surface 31. However, it is also possible to thicken only one of the steel pipes to expand the area of ​​either the convex joint surface 21 or the concave joint surface 31.

[0074] <2> The effect of this example In this example, even if the steel pipes constituting the support column body 20 and the foundation cylinder 31 are thin, the pipe thickness at the ends of the steel pipes can be increased to expand and form a convex joint surface 21 or concave joint surface 31 of a desired size to any size. Compared to using a thick steel pipe along its entire length, the convex joint surface 21 and the concave joint surface 31 can be expanded economically. Furthermore, since the ends of the steel pipes constituting the support column body 20 and the foundation cylinder 31 are reinforced by forming them with thicker walls, the durability of the tilting joint device is further improved. [Explanation of Symbols]

[0075] 10... Support structure 20..Support column body 20a...Positioning hole 21...Convex joint surface 30. Tilt joint device 31...Foundation tube 31a...Positioning hole 31b... 32...Concave joint surface 33. Base plate 33a...Aperture 36... Upper crossbeam 36a...Through-hole in upper crossbeam 36b... Tapered through-holes in upper crossbeams 36c... Hemispherical hole in upper crossbeam 37...lower crossbeam 37a... Through hole in lower crossbeam 38...Connecting material 39a... Upper nut element 39b...Lower nut element 50... Protective net 51. Rope material that makes up the protective net 52. Netting materials that make up protective nets.

Claims

1. A support structure in which the top of the main support column is supported by one or more bracing ropes, The main support column is made of steel pipe, The system comprises a tilting joint device provided at the lower part of the main support column, which supports the main support column so that it can be tilted in one direction or in the circumferential direction, The tilting joint device has its lower end in contact with the ground and includes a steel pipe foundation cylinder that supports the lower part of the support column body so that it can rotate in one direction or all around, An upper crossbeam is inserted into and secured to the lower part of the main support column, A lower crossbeam is inserted into and secured to the upper part of the aforementioned foundation cylinder, The system includes a connecting member that connects the upper and lower crossbeams in the vertical direction, The support column body and the foundation cylinder are inseparably connected by a link mechanism consisting of the upper crossbeam, lower crossbeam and connecting members, while the support column body is rotatably supported by the foundation cylinder. A structure for erecting support columns.

2. The erection structure for a support column according to claim 1, characterized in that a convex joint surface having an arc-shaped cross-section perpendicular to the circumference is formed on either the lower part of the support column body or the upper part of the foundation cylinder, and a concave joint surface corresponding to the convex joint surface is formed on either the lower part of the support column body or the upper part of the foundation cylinder.

3. The erection structure for a support column according to claim 1, characterized in that the upper crossbeam consists of one or more intersecting rod-shaped beam members that penetrate and are anchored to the lower part of the support column body, and the upper part of the connecting member is connected to the center of the beam members so as to be rotatable in the entire circumference of the support column.

4. The erection structure for a support structure according to claim 1, characterized in that the lower crossbeam consists of one or more intersecting rod-shaped beam members that penetrate and are anchored to the upper part of the foundation cylinder, and the lower part of the connecting member is connected to the center of the beam members.

5. The erection structure for a support column according to claim 1, characterized in that the tilting joint device further comprises a base plate having an opening in the center, and the base plate is integrally provided at the lower end of the foundation cylinder.

6. The erection structure for a support column according to claim 1, characterized in that a separate steel material is attached to the end of the steel pipe constituting the main support column or the steel pipe constituting the foundation cylinder to form a reinforcing thickened portion, and a convex joint surface or a concave joint surface is extended and formed on the end surface of the reinforcing thickened portion.

7. The erection structure for a support structure according to claim 1, characterized in that the support body is one of the following: a support for a rockfall protection fence, a chimney made of steel pipe, or a utility pole made of steel pipe.

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