Support structure erection structure

Abstract

To provide a support pillar erection structure capable of erecting a support pillar efficiently at low cost and economically manufacturing the support pillar by eliminating bending moment applied to the support pillar when struck. [Solution] The system comprises a pillar body 20 and a tilting joint device 30 which supports the pillar body 20 so that it can tilt in all circumferential directions. The tilting joint device 30 comprises a foundation tube 31 which supports the lower part of the pillar body 20 so that it can rotate in all circumferential directions, an upper cross beam 36 inserted into and moored at the lower part of the pillar body 20, a lower cross beam 37 inserted into and moored at the upper part of the foundation tube 31, and a connecting member 38 which vertically connects the upper cross beam 36 and the lower cross beam 37. The pillar body 20 and the foundation tube 31 are inseparably connected by a link mechanism formed by the upper cross beam 36, the lower cross beam 37 and the connecting member 38, while the pillar body 20 is rotatably supported by the foundation tube 31.

Description

[Technical field]

[0001] The present invention relates to an erection structure of a support structure that is erected so as to be tiltable in all circumferential directions. [Background technology]

[0002] The pillar body that constitutes the pillar structure is made of rigid materials such as steel pipes, concrete-filled steel pipes, or H-shaped steel, and the steel material used is selected appropriately depending on the bending strength required for the pillar body.

[0003] As an erection structure for a pillar structure, Patent Document 1 discloses a built-in pillar structure in which the lower part of the pillar body is buried in the ground, and Patent Document 2 discloses a grounding type pillar structure in which the ground plate provided at the lower part of the pillar body is grounded to the ground surface without being built into the ground. Patent Document 3 discloses that the lower part of the pillar body has a hinge structure, and the pillar body is configured to be tiltable towards the valley side via the hinge structure. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2014-227693 A [Patent Document 2] JP 2022-105948 A (Figs. 3 and 4) [Patent Document 3] JP 2014-84624 A (Fig. 3) Summary of the Invention [Problem to be solved by the invention]

[0005] Conventional built-in support structures have the following problems: <1> When an attack occurs, axial force, shear force and bending force act on the pillar body. Therefore, the pillar body must be manufactured with high strength so that it can withstand these external forces, which increases the cost of the pillar. <2> In a built-in support structure, the support body needs to be buried long enough to obtain a reaction force from the ground. For example, if a protective fence is 3m high and the supporting ground is soft, the support posts must be buried underground for a length of about 4m, making the total length of the post bodies 7m. <3> If the overall length of the pillar body becomes long, not only does the pillar structure become difficult to transport, but it also requires the installation of a work platform and the introduction of a large boring machine, making the erection of the pillar very time-consuming and costly.

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

[0007] The present invention has been made in consideration of the above points, and its object is to provide an erection structure for a support structure which allows the support body to be erected efficiently and at low cost, and which allows the support body to be economically manufactured by eliminating the bending moment on the support structure when hit. [Means for solving the problem]

[0008] The present invention is an erected structure of a pillar structure in which the head of the pillar body is supported by one or more stay ropes, and comprises a pillar body made of steel pipes, and a tilting joint device provided at the lower part of the pillar body and supporting the pillar body so that it can tilt in one direction or in all directions. The tilting joint device has its lower end grounded in the ground and comprises a steel pipe foundation tube that supports the lower part of the pillar body so that it can rotate in one direction or in all directions, an upper cross beam inserted into and moored at the lower part of the pillar body, a lower cross beam inserted into and moored at the upper part of the foundation tube, and connecting materials that vertically connect the upper cross beam and the lower cross beam, and the pillar body is rotatably supported by the foundation tube while the pillar body and foundation tube are inseparably connected by a link mechanism consisting of the upper cross beam, lower cross beam and connecting materials. In another form 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 pillar body or the upper part of the foundation tube, and a concave joint surface corresponding to the convex joint surface is formed on the other of the lower part of the pillar body or the upper part of the foundation tube. In another form of the present invention, the upper cross beam consists of a single or multiple crossed rod-shaped beams that penetrate and are anchored to the lower part of the pillar body, and the upper part of the connecting material is connected to the center of the beam so that it can rotate in the entire circumferential direction of the pillar. In another embodiment of the present invention, the lower cross beam comprises a single or multiple crossed rod-shaped beams that penetrate and are anchored to the upper part of the foundation tube, and the lower part of the connecting material is connected to the center of the beams. In another embodiment of the present invention, the tilt joint device further comprises a base plate having an opening formed in the center, the base plate being integrally provided on the lower end of the base tube. In another embodiment of the present invention, a reinforcing thickened portion is formed by sheathing the end of the steel pipe constituting the pillar body or the steel pipe constituting the foundation tube with a separate steel material, and a convex joint surface or a concave joint surface is formed by expanding the end surface of the reinforcing thickened portion. In another embodiment of the present invention, the pillar body is any one of a pillar for a rockfall protection fence, a chimney made of steel pipes, and a utility pole made of steel pipes. Effect of the Invention

[0009] The present invention has at least one of the following advantages. <1> The pillar structure can be erected without being erected underground, and the assembly work of the down-joint device and the assembly work of the pillar structure can be performed 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 body and configured to support the support body so that it can tilt in all directions, so that the support body can be allowed to tilt in all directions when hit. Therefore, although axial force and shear force act on the pillar structure, no bending moment acts on the lower part of the pillar body. Therefore, there is no need to design the pillar body and the tilt joint device to be high in strength taking into account bending moments, and the pillar structure can be manufactured economically. <3> The upper cross beam, lower cross beam and connecting member of the tilt joint device function as a link mechanism with a spacing retention function, so that the connection between the lower part of the support body and the tilt joint device is maintained. Therefore, the pillar body can be tilted while maintaining a good connection between the lower part of the pillar body and the tilting joint device. <4> Since the connecting material and the upper cross beam are connected so as to be freely rotatable, even if the support body tilts, no bending force is applied to the connecting portion between the upper part of the connecting material and the upper cross beam. Therefore, the rotational resistance of the tilting joint device is reduced when the support body is tilted. <5> By anchoring both ends of the beam material that constitutes the upper cross beam or the lower cross beam in positioning holes in the pillar body or foundation tube, and rotatably connecting the upper cross beam to the upper part of the connecting material, it is possible to allow the pillar body to tilt while avoiding stress from acting on the connection part between the cross beam and the connecting material when the pillar body tilts. <6> When an upper cross beam or a lower cross beam is used by crossing multiple beam materials, the multiple beam materials that make up the cross beam can be anchored in a centered state at the center of the pillar body or foundation tube. Therefore, the connecting material can be arranged along the axial center of the pillar body and the foundation tube. <7> The convex or concave joint surface can be reinforced by using the reinforcing thickened portion formed at the end of the steel pipe that constitutes the pillar body or the steel pipe that constitutes the foundation tube, while also being expandable to any desired width (area). Therefore, even if the steel pipe constituting the pillar body or foundation tube is thin, the area of ​​the convex joint surface or concave joint surface can be expanded and formed without being affected by the thickness of the steel pipe. [Brief description of the drawings]

[0010] [Figure 1] An explanatory diagram of the support structure applied to a safety fence [Diagram 2] Exploded view of the tilt joint device according to the first embodiment [Diagram 3] Cross-sectional view of the lower part of the support body with the tilt joint device attached [Figure 4] Cross-sectional view taken along line IV-IV in FIG. [Figure 5A] An explanatory diagram of a method for assembling the upper half of the tilt joint device [Figure 5B] An explanatory diagram of a method for assembling the tilt joint device [Figure 5C] Illustration of the support body when tilted [Figure 6] FIG. 13 is a partially enlarged view of a tilt joint device according to a second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

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

[0012] [Example 1] 1. Targets for support structures The support structure 10 can be applied to, for example, steel pipe supports for safety fences, steel pipe utility poles, steel pipe chimneys, etc. In this example, a form in which the support structure 10 is applied to a safety fence will be described.

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

[0014] <2> Safety net The protective net 50 is a well-known capture net for catching the load of falling rocks, etc., 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 materials 51, 52. When the protective net 50 includes rope material 51, the rope material 51 only needs to be hung between adjacent support structures 10, and the number and positions of the rope material 51 can be selected appropriately. Furthermore, the protective net 50 also includes a configuration in which the rope material 51 is looped to form a chain structure of multiple rings. The protective net 50 also includes a configuration in which a known shock absorbing device is attached to a part of the rope material 51.

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

[0016] 2. Support structure The pillar structure 10 comprises a pillar body 20 made of steel pipe, and a tilting joint device 30 provided at the lower part of the pillar body 20 and supporting the pillar body 20 so that it can tilt in all circumferential directions.

[0017] <1> Support body The support pillar body 20 is a cylindrical steel pipe (for example, with a diameter of 240 to 300 mm) having a cross-sectional shape of, for example, a circle, and has the strength to support the protective net 50 .

[0018] The support pillar body 20 is not limited to a single piece, but may be made up of multiple divided support pillar bodies. When the strut body 20 is constructed from a plurality of split strut bodies, a flange is provided at the end of each split strut body, and the butted flanges are joined together by fastening them with bolts. When the pillar body 20 is composed of multiple divided pillar bodies, the pillar body 20 can be efficiently transported to the site and installed even when the cross-sectional diameter of the pillar body 20 is large or the overall length of the pillar body 20 is long.

[0019] Hook elements and bracket elements are provided on the outer periphery of the support body 20 for attaching a protective net 50, stay ropes, etc.

[0020] A tapered convex joint surface 21 is formed on the lower part of the support body 20. The details of the convex joint surface 21 will be described later.

[0021] <2> Tilt joint device The following description will be given with reference to FIGS. The tilting joint device 30 comprises a foundation tube 31 that supports the lower part of the pillar main body 20 so that it can rotate freely, a base plate 33 that is integrally formed at the lower end of the foundation tube 31, an upper cross beam 36 that is inserted into and anchored to the lower part of the pillar main body 20, a lower cross beam 37 that is inserted into and anchored to the upper part of the foundation tube 31, a connecting member 38 that penetrates vertically between the two cross beams 36, 37 to connect them, and nut elements 39a, 39b that are screwed into the upper and lower ends of the connecting member 38.

[0022] The tilt joint device 30 is interposed at the lower part of the pillar body 20 in order to allow only axial force and shear force to act on the lower part of the pillar body 20, and to prevent bending moment from acting on the lower part of the pillar body 20.

[0023] <2.1> Basic tube The foundation tube 31 is a steel tube with a short axial length (having a diameter of, for example, 240 to 300 mm and a total length of, for example, 200 to 400 mm) for supporting the pillar body 20 together with the base plate 33 . A concave joint surface 31 is formed on the upper part of the base cylinder 31. The 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 is in contact with the ground and supports the support body 20 and the foundation tube 31, and is larger than the foundation tube 31. The lower end of the base tube 31 is placed on the upper surface of the base plate 33 and is fixed thereto by welding or the like.

[0025] A circular opening 33a is provided in the center of the base plate 33 so that a hand can be inserted into the foundation tube 31 to perform the connecting work between the support body 20 and the foundation tube 31. The base plate 33 has a plurality of holes formed in its periphery so that it can be fixed with anchor pins or the like.

[0026] <3> Joint surface between the pillar body and the foundation tube At the joint between the lower part of the pillar body 20 and the upper part of the foundation tube 31, a convex joint surface curved in an arc and a concave joint surface curved in an arc corresponding to the convex joint surface are formed. In this example, a form is described in which a convex joint surface 21 is provided on the pillar main body 20 side and a concave joint surface 31 is provided on the foundation tube 31 side, but the combination of the convex joint surface 21 and the concave joint surface 31 may be reversed.

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

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

[0029] <3.3> Relationship between the radius of curvature of the joint surface The following description will be given with reference to FIG. In this embodiment, a configuration will be described 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 curved joint surfaces 21 and 32 share a center O and a radius of curvature r. The radius of curvature r of both joint surfaces 21, 32 can be selected appropriately, but should be set to a dimension larger than the diameter of the steel pipe constituting the pillar body 20 or the foundation tube 32.

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

[0031] The reason why the radii of curvature of the respective joint surfaces 21, 31 are set in the above-mentioned relationship is to allow the convex joint surface 21 and the concave joint surface 31 to rotate while ensuring a contact surface between them.

[0032] <3.4> Method of forming the protruding surface and the receiving surface The curved surfaces of the convex joining surface 21 and the concave joining surface 31 can be easily processed by cutting, polishing or the like. Since the steel pipes constituting the convex joint surface 21 and the concave joint surface 31 can be directly machined to form them, the effort of later attaching separate and independent joint surface elements to the ends of the steel pipes is eliminated. Therefore, the joint surface can be formed at low cost at the joint between the steel pipe pillar body 20 and the foundation tube 31.

[0033] <3.5> Relationship between cross-sectional diameter and wall thickness of the pillar body and foundation tube The cross-sectional diameter and thickness of the steel pipe constituting the pillar body 20 and the steel pipe constituting the foundation tube 31 can be selected appropriately. In this example, a form is described in which the cross-sectional diameters and steel pipe thicknesses of the steel pipe constituting the pillar body 20 and the steel pipe constituting the foundation tube 31 are equal, but the cross-sectional diameters of the upper and lower steel pipes may be a combination of different diameters. What is important is that at the joint between the pillar body 20 and the foundation tube 31, a curved, uneven joint surface is formed that is sufficient to allow the pillar body 20 to rotate.

[0034] <4> Link mechanism with spacing function The upper cross beam 36, the lower cross beam 37 and the connecting member 38 constitute a link mechanism having a spacing function. The link mechanism rotatably supports the support body 20 with the foundation tube 31, while inseparably connecting the joint between the holding support body 20 and the foundation tube 31, where the convex joint surface 21 and the concave joint surface 31 are joined.

[0035] <4.1> Upper crossbeam The upper cross beam 36 is an internal reaction member that is anchored to the support body 20 to provide a reaction force. The upper cross beam 36 is made of one or more crossed rod-shaped beam members having a total length capable of crossing the support body 20 . The beam material constituting the upper cross beam 36 may be, for example, a bar material such as a steel rod or a cylindrical body such as a steel pipe. When the upper cross beam 36 is constructed from a plurality of beam materials, the beam materials may be a combination of the same diameter or a combination of different diameters.

[0036] <4.1.1> Arrangement of upper cross beams In this embodiment, a configuration in which the upper cross beam 36 is formed by intersecting two beam members in a cross shape will be described. When multiple beams are crossed to form the upper cross beam 36, the beams are installed so that the outer peripheral surfaces of adjacent beams are in contact with each other to form nodes so that load can be transmitted between adjacent beams.

[0037] <4.1.2> Mooring structure of upper cross beam A plurality of pairs of positioning holes 20a are formed in the diametrical direction on the lower peripheral surface of the support body 20, and the two beam members constituting the upper cross beam 36 are inserted and attached into these pairs of positioning holes 20a, 20a. Both ends of the beam material constituting the upper cross beam 36 are simply anchored in the positioning holes 20 a of the support body 20 . The reason why both ends of the beam material that constitutes the upper cross beam 36 are not rigidly connected (fixed) to the positioning holes 20a of the pillar body 20 is to prevent stress from acting on the connection between the upper cross beam 36 and the connecting material 38 when the pillar body 20 is tilted.

[0038] <4.1.3> Through holes in upper cross beams A through hole 36a is provided in the center of the beam material constituting the upper cross beam 36. The through holes 36a of the upper beam material that constitutes the upper cross beam 36 are formed to be of uniform diameter, but the through holes 36b of the lower beam material that constitutes the upper cross beam 36 are formed as tapered holes (frustoconical holes) to allow the connecting material 38 to swing.

[0039] <4.1.4> Hemispherical hole in upper cross beam Furthermore, a mortar-shaped semi-spherical hole 36c is formed in the upper part of the through hole 36a of the upper beam member. The hemispherical hole 36c is provided in the uppermost beam material that constitutes the upper cross beam 36 in order to accommodate the hemispherical nut element 39a (described later) in a rotatable manner, making it easier to allow rotation at the connection between the upper cross beam 36 and the upper part of the connecting material 38. The diameters of the through holes 36a, 37a of the cross beams 36, 37 are set to have a sufficient dimension relative to the diameter of the connecting member 38 so as to allow the connecting member 38 to rotate.

[0040] <4.2> Lower crossbeam The lower cross beam 37 is an internal reaction member that is anchored to the foundation tube 31 to obtain a reaction force. The lower cross beam 37 consists of one or more crossed rod-shaped beam members having a total length sufficient to cross the foundation tube 31 . The beam material constituting the lower cross beam 37 may be, for example, a bar such as a steel rod or a cylindrical body such as a steel pipe. When the lower cross beam 37 is constructed from a plurality of beam materials, the beam materials may be a combination of the same diameter or a combination of different diameters.

[0041] <4.2.1> Arrangement of lower cross beams In this embodiment, a configuration in which the lower cross beam 37 is formed by intersecting two beam members in a cross shape will be described. When multiple beams are crossed to form the lower cross beam 37, the beams are installed so that the outer peripheral surfaces of adjacent beams are in contact with each other to form nodes so that load can be transmitted between adjacent beams.

[0042] <4.2.2> Mooring structure of lower cross beam A plurality of pairs of positioning holes 31a are formed in the diameter direction on the upper peripheral surface of the foundation tube 31, and two beam members constituting the lower cross beam 37 are inserted and attached to these pairs of positioning holes 31a, 31a. Both ends of the beam material constituting the lower cross beam 37 are simply anchored to the positioning holes 31 a of the foundation tube 31 . The reason why both ends of the beam material that constitutes the lower cross beam 37 are not rigidly connected (fixed) to the positioning holes 31a of the foundation tube 31 is to prevent stress from acting on the connection between the lower cross beam 37 and the connecting material 38 when the support body 20 tilts.

[0043] <4.2.3> Through holes in lower cross beams A through hole 37a is provided in the center of the beam material constituting the lower cross beam 37.

[0044] <4.3>Connecting material The connecting member 38 is a connecting member for connecting the upper cross beam 36 and the lower cross beam 37 so as to be capable of transmitting a load.

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

[0046] <4.3.2> Nut elements A connecting member 38 is inserted through the through holes 36a, 36b, 37a of the cross beams 36, 37, and has nut elements 39a, 39b screwed to both ends of the connecting member 38. The upper nut element 39a is a nut and a semispherical washer formed separately or integrally, or a nut having a spherical outer shape is used. The lower nut element 39b may be a known hexagonal nut.

[0047] <5> Backing rope The stay rope (not shown) is a single or multiple rope materials for keeping the pillar body 20 upright, and is stretched between the head of the pillar body 20 and an anchor installed on the mountainside slope. A shock absorber may be attached to part of the stay rope to absorb kinetic energy when the pillar body 20 tilts.

[0048] [How to assemble the tilt joint device] Next, a method for assembling the tilting joint device 30 will be described.

[0049] <1> Assembly of the upper cross beam (Fig. 5A) The two beam members constituting the upper cross beam 36 are inserted from the outside into positioning holes 20a opened on the lower peripheral surface of the pillar body 20 and arranged in a cross shape. When installing the upper cross beam 36, the through holes 36a opened in the centers of the two beam members constituting the upper cross beam 36 are aligned on the same line.

[0050] <2> Assembly of the upper part of the connector (Fig. 5A) Next, the connecting material 38 is inserted upward from below the pillar body 20 , and the upper part of the connecting material 38 is inserted into the through hole 36 a formed at the intersection of the upper cross beam 36 . By inserting a connecting member 38 through the intersection of the upper cross beams 36 that intersect in a cross shape, the two beam members that make up the upper cross beam 36 are anchored in a centered state in the center of the support body 20.

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

[0052] The bottom of the pillar body 20 is open so that the worker can insert his / her hand inside the pillar body 20, and therefore the setting work of the upper cross beam 36 and the connecting material 38 can be easily performed through the bottom opening of the pillar body 20.

[0053] <3> Assembly of the lower cross beam (Fig. 5B) The two beam members constituting the lower cross beam 37 are inserted from the outside into positioning holes 31a opened on the peripheral surface of the foundation tube 31, and are installed in a cross shape. When installing the lower cross beam 37, the through holes 37a opened in the centers of the two beam members constituting the lower cross beam 37 are aligned on the same line.

[0054] <4> Bonding of bonding surfaces The lower part of the pillar body 20 and the upper part of the foundation tube 31 are butted together, so that the convex joint surface 21 and the concave joint surface 31 come into contact with each other.

[0055] <5> Assembling the connectors (Fig. 3) When performing the contact work of both joint surfaces 21, 31, the lower part of the connecting material 35 is inserted into the intersection of the lower cross beam 37, and the nut element 39b is screwed into the exposed part of the connecting material 35 protruding below the lower cross beam 37. The lower nut element 39b is tightened to tension the connector 35 between the upper cross beam 36 and the lower cross beam 37 that are anchored to both ends of the connector 35. The tilt joint device 30 maintains the joined state between the convex joint surface 21 and the concave joint surface 31 by a link mechanism equipped with a spacing maintaining function using an upper cross beam 36, a lower cross beam 37, and a connecting member 38.

[0056] In the present invention, the assembly work of the tilting joint device 30 and the assembly work of the pillar structure 10 can be completed simultaneously by performing the simple task of connecting the pillar main body 20 and the foundation tube 31 via the upper cross beam 36, the lower cross beam 37 and the connecting material 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 placed in contact with the ground surface and erected.

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

[0059] Once the tilting joint device 30 has been fixed in place and the erection of the support structure 10 has been completed, protective nets 50 are attached between each of the adjacent supports 10 to complete the protective fence.

[0060] [Tilt action of the support] Next, the tilting action of the column structure 10 when an attack is received will be described with reference to Figs. 3 and 5C.

[0061] <1> Protective Net Attack When a collapsed object such as a falling rock collides with the protection net 50, the protection net 50 is deformed toward the slope valley side.

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

[0063] <3> Tilt of the support body The pillar body 20 is erected in a state that allows tilting in all directions (all directions) via the tilting joint device 30, so that when a tilting force acts on the pillar body 20, the pillar body 20 tilts from the upright state shown in Figure 3 to the center O of the joint surfaces 21, 31 of the tilting joint device 30 as the starting point, as shown in Figure 5C. When the support body 20 tilts, the base tube 31 does not displace.

[0064] <3.1> Rotation axis of the support body The tilting action of the tilt joint device 30 will be described in detail with reference to FIG. 5C. The tilt joint device 30 has a structure in which the convex joint surface 21 at the lower part of the pillar body 20 and the concave joint surface 32 at the upper part of the foundation tube 31 are in close contact with each other through a curved surface. Therefore, when a tilting force acts on the pillar body 20, the pillar body 20 rotates about the center O of the arc surface where the convex joint surface 21 and the concave joint surface 32 are in contact with each other as the rotation axis. In this way, in the present invention, tilting of the pillar body 20 can be permitted in all circumferential directions by a simple operation of simply assembling the tilt joint device 30 to the lower part of the pillar 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 tilt joint device 30 at the bottom of the pillar main body 20, when an impact is received, axial force and shear force act on the pillar main body 20, but no bending moment acts on the bottom of the pillar main body 20. Therefore, there is no need to design the pillar body 20 and the tilting joint device 30 to have high strength taking into account bending moments.

[0066] <3.3> Holding effect of joint surfaces When the pillar body 20 tilts relative to the tilting joint device 30, there is a risk that the joint surfaces 21, 31 of the tilting joint device 30 will separate and the contact state will be lost, but the tilting joint device 30 maintains the joint state of the joint surfaces 21, 31 of the tilting joint device 30 by a link mechanism equipped with a spacing retention function using the upper cross beam 36, lower cross beam 37, and connecting material 38.

[0067] The holding action of the joint surfaces 21, 31 of the tilt joint device 30 will be described in detail below. An upper cross beam 36 provided at the bottom of the pillar body 20 and a lower cross beam 37 provided at the top of the foundation tube 31 are connected by a connecting member 38, maintaining a constant distance between them. Therefore, even if tension acts on the connecting material 38, the strength of the connecting material 38 exceeds the tension, allowing the pillar body 20 to rotate while maintaining the contact state of the joint surfaces 21, 31 of the tilting joint device 30.

[0068] <3.4> Rotational resistance of tilt joint device As the pillar body 20 tilts, a bending force acts on the connection between the upper part of the connecting material 38 and the upper cross beam 36. In the tilt joint device 30, the connecting member 38 and the upper cross beam 36 are connected so as to be freely rotatable, so that the center of rotation of the column body 20 does not shift even if the column body 20 tilts. Even if the connecting material 38 were to tilt, the connection portion between the upper part of the connecting material 38 and the upper cross beam 36 rotates, so that no bending force acts on the connection portion between the upper part of the connecting material 38 and the upper cross beam 36. Therefore, when the pillar body 20 is tilted, the rotation resistance of the tilting joint device 30 is reduced.

[0069] It is anticipated that an excessive load will be applied to the connection between the upper portion of the connecting material 38 and the upper cross beam 36 when the pillar body 20 tilts. In the present invention, the upper portion of the connecting material 38 is connected to the upper cross beam 36 so that it can rotate freely, so that even if the support body 20 tilts, an excessive load is not applied to the connection between the connecting material 38 and the upper cross beam 36. Therefore, the connecting member 38 can allow the support body 20 to tilt while remaining substantially vertical.

[0070] [Example 2] Other embodiments will be described below. In the description, the same parts as those in the first embodiment will be given the same reference numerals and detailed description thereof will be omitted.

[0071] <1> Means for expanding the joint surface The means for increasing the thickness of both bonding surfaces 21, 31 will be described with reference to FIG. When the area of ​​the convex joint surface 21 and the concave joint surface 31 is to be expanded, a separate steel material (steel plate or steel pipe) is sheathed to the ends of the steel pipes constituting the pillar body 20 and the foundation tube 31, and the sheathed steel material is fixed integrally to the steel pipe body by welding or the like to form reinforcing thickened portions 31b, 20b of the desired thickness.

[0072] The end of the steel pipe, including each of the thickened reinforcing portions 31b, 20b, is curved to form a convex joint surface 21 or a concave joint surface 31.

[0073] In this example, a form is described in which the ends of both the steel pipe for the pillar body 20 and the steel pipe for the foundation tube 31 are thickened to expand the convex joint surface 21 and the concave joint surface 31, but 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> Effects of this Example In this example, even if the steel pipes constituting the pillar body 20 and the foundation tube 31 are thin, the thickness of the ends of the steel pipes can be increased to form a convex joint surface 21 or concave joint surface 31 of the desired width, which can be expanded to any width. Compared to using a steel pipe having a large thickness over its entire length, the convex joint surface 21 and the concave joint surface 31 can be economically expanded. Furthermore, the ends of the steel pipes constituting the pillar body 20 and the foundation tube 31 are reinforced by being made thicker, further improving the durability of the tilt joint device. [Explanation of symbols]

[0075] 10... Support structure 20....Support 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 cross beam 36b: Tapered through hole in upper cross beam 36c: Hemispherical hole in upper cross beam 37...lower crossbeam 37a: Through hole in lower cross beam 38...Connecting material 39a...Upper nut element 39b Lower nut element 50...Protection net 51....Rope material constituting protective net 52....Net material constituting the protective net

Claims

1. A support structure in which the head of the support body is supported by one or more stay ropes, A steel pipe support body, A tilt joint device is provided at the lower part of the support body and supports the support body so that it can tilt in one direction or in the entire circumferential direction. The tilt joint device has a lower end grounded on the ground and supports the lower part of the support body rotatably in one direction or in the entire circumferential direction. A steel pipe base tube; An upper cross beam inserted into and anchored to the lower part of the support body; A lower cross beam inserted into and anchored to the upper part of the foundation tube; A connecting member that connects the upper cross beam and the lower cross beam in the vertical direction, The support body is supported by the foundation tube so as to be rotatable while the support body is inseparably connected to the foundation tube by the link mechanism consisting of the upper cross beam, the lower cross beam and the connecting member. Upright structure of pillar structure.

2. The erection structure of a pillar structure as described in 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 pillar body or the upper part of the foundation tube, and a concave joint surface corresponding to the convex joint surface is formed on the other of the lower part of the pillar body or the upper part of the foundation tube.

3. The erection structure of a pillar structure as described in claim 1, characterized in that the upper cross beam consists of a single or multiple crossed rod-shaped beam materials that penetrate and are anchored to the lower part of the pillar body, and the upper part of the connecting material is connected to the center of the beam material so as to be rotatable in the entire circumferential direction of the pillar.

4. The erection structure of a pillar structure as described in claim 1, characterized in that the lower cross beam consists of a single or multiple crossed rod-shaped beams that penetrate and are anchored to the upper part of the foundation tube, and the lower part of the connecting material is connected to the center of the beam.

5. 2. The erection structure of a support structure as described in claim 1, characterized in that the tilt joint device further comprises a base plate having an opening formed in the center, the base plate being integrally formed with the lower end of the foundation tube.

6. The erection structure of the pillar structure described in claim 1, characterized in that a reinforcing thickened portion is formed by exteriorly covering the end of the steel pipe constituting the pillar body or the steel pipe constituting the foundation tube with a separate steel material, and a convex joint surface or a concave joint surface is extended and formed on the end surface of the reinforcing thickened portion.

7. 2. The erected structure of a support structure according to claim 1, wherein the support body is any one of a support for a rockfall guard fence, a chimney made of steel pipes, and a utility pole made of steel pipes.

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