Rod body, connector for the same, and environment conservation material connected body

Abstract

To provide a rod body with a connection joint structure capable of facilitating mutual connection and ensuring high tensile strength.SOLUTION: A rod body 1 comprises: a rod body main body 10 roughly formed into a slender linear rod shape having rigidity similar to that of a steel wire, a reinforcement or the like; ring parts 11 which are provided at both ends of the rod body main body 10, in each of which a bent part 12a bent by a prescribed radius from one end of the rod body main body 10 toward an opposite end in an axial direction is formed and an extension 12b extends from the bent part 12a toward the opposite end side of the rod body main body 10 in the axial direction, and each of which is bent from the tip of the extension 12b toward one end of the rod body main body 10 in the axial direction so as to be formed into a hairpin curve shape forming S as a whole; and an expansion blocking member 14 that is provided across the rod body main body 10 and each extension 12b and that surrounds the rod body main body 10 and each extension 12b and blocks movement of each extension 12b in an expanding direction with respect to the rod body main body 10.SELECTED DRAWING: Figure 1A

Description

[Technical field]

[0001] The present invention relates to a technique for connecting elongated, straight, rod-like members having rigidity, such as steel wires or reinforcing bars. [Background technology]

[0002] Environmental conservation materials such as mountainside conservation materials have been proposed as a technique for preventing soil erosion caused by rainwater and the like on slopes and the like (Patent Document 1). The environmental conservation materials disclosed in Patent Document 1 are formed into a cylindrical skeleton structure and are installed horizontally on the slopes of the mountainside. The environmental conservation materials are installed with their longitudinal direction perpendicular to the flow direction of the soil, sand, gravel, and the like. A wire cable, which is a cord, is inserted in the radial center of one environmental conservation material installed on a slope and along the longitudinal direction. When multiple environmental conservation materials are installed in series, both insertion ends of the wire cable inserted into adjacent environmental conservation materials are connected by a coiled connection part, and the insertion ends extending outward in the longitudinal direction from the environmental conservation materials at both ends are connected to anchor piles via anchor parts to hold the environmental conservation materials.

[0003] The coil winding connection portion has both insertion ends of adjacent wire cables wound around the bolt shaft, and the tip of the wire cable folded back from the bolt shaft is gripped and fixed to the cable wire by a fixing device. The anchor portion has a loop portion formed at the end of the wire cable passed through an anchor pile via a retaining cap to prevent the end of the wire cable from coming off the anchor pile. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2021-80686 A (paragraphs 0088-0103, Figures 10 and 11) Summary of the Invention [Problem to be solved by the invention]

[0005] The connection work of the coil-wound connection part of the wire cable disclosed in Patent Document 1 is carried out after the environmental conservation material is installed on the desolate slope of the mountainside, but since the wire cable has high strength and high resilience, it is difficult to wind the end of the wire cable around the bolt at the installation site of the environmental conservation material, and the work of fixing the tip of the wire cable with a fastener requires tightening with a fastening tool such as pliers. In addition, the anchor part requires processing such as providing a through hole for a retaining ring at the top of the anchor pile, and rust is likely to occur from the through hole, shortening the life of the anchor pile.

[0006] The inventors of the present application focused on long, slender, rigid, straight rod-like members such as steel wires or reinforcing bars as materials that can hold environmental conservation materials without using wire cables, and came up with the present invention.

[0007] In other words, the object of the present invention is to provide rod bodies equipped with a connecting joint structure that makes it easy to connect them to each other while ensuring high tensile strength, to provide a rod body connecting device that makes it easy to connect the rod bodies, and to provide an environmental conservation material connector that can quickly install multiple environmental conservation materials in a specified location. [Means for solving the problem]

[0008] A first invention of a rod body that realizes the object of the present invention can be configured to have a rod body main body portion formed into a long, thin, approximately straight rod having rigidity, such as a steel wire or reinforcing bar, a curved portion provided at both ends of the rod body main body portion, bent from one axial end of the rod body main body portion toward the opposite end side to form a curved portion of a predetermined radius, an extension portion extending from the curved portion toward the opposite axial end side of the rod body main body portion, and further bent from the tip of the extension portion toward the one axial end side of the rod body main body portion to form a hairpin curve forming an S-shape as a whole, and an expansion prevention member provided between the rod body main body portion and each of the extension portions, surrounding the rod body main body portion and each of the extension portions, and preventing movement of each of the extension portions in the expansion direction relative to the rod body main body portion.

[0009] A second invention of a rod body that realizes the object of the present invention is a rod body of the first invention, in which the ring portions provided at both ends of the rod body main body can be configured so that the planes of the curved portions of each ring portion are aligned parallel to each other.

[0010] A third aspect of the rod body that realizes the object of the present invention can be configured such that, in the rod body of the first aspect, a buffer portion that is deformed by an external force is provided on the rod body main body.

[0011] A fourth invention of a rod body that realizes the object of the present invention is a rod body of the first invention, in which each extension portion of the loop portion provided at both ends of the rod body main body is formed in a hairpin shape, and the tip portion is bent outward relative to the rod body main body.

[0012] The fifth invention of the rod body which realizes the object of the present invention is that in any of the rod bodies of the first to fourth inventions, the expansion prevention member can have a spiral structure in which a wire is wound in a spiral shape with gaps between each turn.

[0013] A sixth aspect of the present invention, a rod connecting device for connecting a plurality of rods according to the second aspect of the present invention, comprises a connecting pin having a thread joint on the surface of a first steel bar body with helical nodes protruding at a predetermined pitch, and a pair of first screw bodies having a first screw body main body portion having an inner diameter larger than the diameter of the first steel bar body and smaller than the thread joint diameter, having play in the axial direction relative to the thread joint, and an outer diameter larger than the inner diameter of the curved portion of the rod body, wherein the ring portions of the plurality of rods are overlapped and the connecting pin is inserted into each curved portion of each of the overlapped ring portions, and each of the overlapped ring portions is disposed between the pair of first screw bodies.

[0014] A seventh aspect of the rod body connecting device which realizes the object of the present invention is that in the rod body connecting device of the sixth aspect, at least one of the pair of first screw bodies can be configured so that a first arm portion extends outward from one end side of the wire winding of the first screw body main body portion.

[0015] The eighth invention of the rod connecting device which realizes the object of the present invention is a rod connecting device of the sixth or seventh invention, in which the plurality of rods are connected to the connecting pin in three, two of the rods are connected approximately in series via the connecting pin, and the other rod is positioned at any angular position between the two rods with the connecting pin as the center.

[0016] A ninth aspect of the rod body connecting device which realizes the object of the present invention is a rod body connecting device of the sixth or seventh aspect, wherein the inner diameter of the curved portion of the rod body is formed to be larger than the outer diameter of the connecting pin, and the rod body and the connecting pin can rotate relatively around the axis of the connecting pin.

[0017] A tenth aspect of the rod connecting device that realizes the objects of the present invention can be configured as follows: the rod connecting device of the sixth aspect of the invention, comprising an anchor having a thread joint in which helical nodes are formed on a surface of a second steel bar body at a predetermined pitch, and a pair of second screw bodies in which a wire rod is wound helically to be screwed onto the anchor at intervals along the axial direction, forming a helical gap between adjacent wire rods that screws into the thread joint of the anchor, the second screw body having an inner diameter larger than the diameter of the second steel bar body of the anchor and smaller than the diameter of the thread joint, the second screw body having an outer diameter larger than the inner diameter of the curved portion of the rod, and in which the connecting pin is inserted into only one of the ring portions of the plurality of rod bodies, the anchor is inserted into the other ring portion of the rod body, and the other ring portion is disposed between the pair of second screw bodies.

[0018] An eleventh aspect of the present invention, a rod body connecting device which realizes the object of the present invention, is the rod body connecting device of the tenth aspect, wherein at least one of the pair of second screw bodies has a second arm portion extending outward from one end side of the wire winding of the second screw body main body portion.

[0019] A twelfth aspect of the rod connecting device which achieves the object of the present invention is a rod connecting device according to the tenth or eleventh invention, wherein the inner diameter of the curved portion of the other ring portion of the rod which is inserted into the anchor is formed to be larger than the outer diameter of the anchor, and the rod and the anchor can rotate relatively around the axis of the anchor.

[0020] The 13th invention of an environmental conservation material connection body that realizes the object of the present invention can be configured in such a way that environmental conservation materials are attached to the multiple rod bodies connected in series that constitute the rod body connecting device of the 10th or 11th invention. Effect of the Invention

[0021] According to the rod body of the first invention, the connecting joint structure formed by the ring portion makes it possible to easily connect the rod bodies to each other, and high tensile strength can be ensured.

[0022] According to the rod body of the second invention, all of the ring portions of the multiple rod bodies face the same plane, so that the multiple rod bodies can be connected using the ring portions with the same specifications.

[0023] According to the rod body of the third invention, the tensile force and bending force applied to the rod body can be absorbed by the buffer portion.

[0024] According to the rod body of the fourth invention, the bending shape of the ring portion is made to be an overall curved shape, so that even if a tensile force is applied to the ring portion along the longitudinal direction of the rod body main body, there are no points in the ring portion where tensile stress is concentrated, and deformation of the ring portion, etc. can be prevented.

[0025] According to the rod body of the fifth invention, by making the expansion prevention member have a spiral structure, the expansion prevention member can be attached from the outside of the ring portion without requiring bending or the like.

[0026] According to the rod body connecting device of the sixth invention, the ring portions of the rod bodies to be connected to the connecting pin are inserted and overlapped, and the pair of first screw bodies arranged on both sides can be directly turned by hand to screw them in, so that the connecting work can be performed without the need for special tightening tools such as pliers.

[0027] According to the rod body connecting device of the seventh aspect of the present invention, the first screw body can be easily turned by hand by gripping the first arm portion.

[0028] According to the rod body connecting device of the 8th invention, the other rod body can support a force applied to the rod body connected approximately in series in a direction perpendicular to the axial direction of the rod body connected approximately in series.

[0029] According to the rod connecting device of the ninth invention, the orientation of the rods can be adjusted as desired, and multiple rods connected approximately in series can be made into a single rod that is curved overall.

[0030] According to the rod connecting device of the tenth invention, the ring portion into which the connecting pin is not inserted is inserted into the anchor, and the pair of second screw bodies are directly turned by hand to screw in and advance on the anchor, thereby preventing the ring portion from coming loose, and the rod can be supported by the anchor.

[0031] According to the rod body connecting device of the eleventh aspect of the invention, the second screw body can be easily turned by hand by gripping the second arm portion.

[0032] According to the rod connecting device of the twelfth invention, if a stone or the like is present under the ground where the anchor is to be inserted, the insertion position can be changed to curve the rods to be connected as a whole.

[0033] According to the environmental conservation material connector of the 13th invention, it is possible to attach it to the environmental conservation materials in advance, and then connect the rods together at the installation site of the environmental conservation materials and attach them to anchors, making it easy to install multiple environmental conservation materials. [Brief description of the drawings]

[0034] [Figure 1A] 1 shows a first embodiment of a rod body according to the present invention, where (a) is a top view of the rod body, (b) is a front view of the rod body shown in (a), (c) is an enlarged front view of an expansion prevention member, and (d) is a side view of the expansion prevention member of (c). [Figure 1B] 1B is a diagram showing a method of attaching the expansion prevention member shown in FIG. 1A to the annulus portion. [Diagram 2] 2 shows an embodiment of an environmental conservation material with a rod body in which an environmental conservation material is previously attached to the rod body shown in FIG. 1, (a) being a top view of the environmental conservation material with a rod body, and (b) being a front view of the environmental conservation material with a rod body shown in (a). [Diagram 3] 3 shows an embodiment of an environmental conservation material connection body in which the rod-shaped environmental conservation materials shown in FIG. 2 are connected in series, where (a) is a top view of the environmental conservation material connection body, and (b) is a front view of the environmental conservation material connection body shown in (a). [Figure 4] 4 shows an embodiment of a rod connecting device used in the environmental conservation material connecting assembly shown in FIG. 3, in which (a) is an exploded front view, and (b) is a view taken along the line AA in (a). [Diagram 5] FIG. 5 is a front view of the rod connecting device shown in FIG. [Figure 6] 6 is a view of the rod body connecting device shown in FIG. 5 taken along the arrow BB. [Figure 7] 4 is a front view showing an embodiment of an anchor device used in the environmental conservation material connector shown in FIG. 3. [Figure 8] 4A and 4B show an embodiment of the environmental conservation material shown in FIG. 2 and FIG. 3, in which FIG. 4A is a perspective side view of the environmental conservation material, and FIG. 4B is a perspective view of the external appearance of the environmental conservation material shown in FIG. [Figure 9] FIG. 2 is a top view of a second embodiment of a rod body according to the present invention. [Figure 10]FIG. 11 is a top view of a third embodiment of a rod body according to the present invention. [Figure 11] 5A to 5C show another embodiment of the rod connecting device according to the present invention, where (a) is a top view, (b) is a front view, and (c) is an enlarged view taken along the CC arrow in (a). [Figure 12] FIG. 2 is a top view showing a first embodiment of another connecting aspect of a rod body according to the present invention. [Figure 13] FIG. 11 is a top view showing a second embodiment of another connecting aspect of the rod body according to the present invention. [Figure 14] FIG. 11 is a top view showing a third embodiment of another connecting aspect of the rod body according to the present invention. [Figure 15] FIG. 13 is a top view showing a fourth embodiment of another aspect of connecting rod bodies according to the present invention. [Figure 16] FIG. 15 is a top view showing a modification of the embodiment shown in FIG. [Figure 17] FIG. 13 is a top view showing a fifth embodiment of another connecting aspect of the rod body according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0035] Hereinafter, the present invention will be described based on the embodiments shown in the drawings. First embodiment 1A to 3 show a first embodiment of a rod according to the present invention. In FIG. 1A(a)(b), the rod 1 has a rod body 10 formed in an elongated, substantially linear shape and made of a material having rigidity, such as steel wire or reinforcing bar, and ring parts 11 (11A, 11B) formed at both ends of the rod body 10 in the longitudinal direction. A buffer part 13 is formed in the longitudinal center of the rod body 10, and when an external force such as a tensile force or bending force in the longitudinal direction (axial direction) is applied to the rod body 10, the buffer part 13 expands and contracts in the axial direction or bends to absorb the external force. This prevents deformation of the ring part 11 of the rod 1, a connecting device and an anchor to which the rod 1 is connected, which will be described later, and prevents damage to the ring part 11, the connecting device and the anchor due to a sudden external force. Furthermore, the ring part 11 is fitted with an expansion prevention member 14 (14A, 14B) that prevents the ring part 11 from expanding. Incidentally, the buffer portion 13 does not necessarily have to be provided if the influence of external forces acting on the rod body 1 is small in the environment in which the rod body 1 is used.

[0036] In this embodiment, the rod body 10 uses a soft steel wire (AZA-30H: manufactured by Nichia Steel Industries, diameter 10 mm). At both ends of the rod body 10 in the longitudinal direction, rings 11A and 11B are formed symmetrically with respect to the center in the longitudinal direction. Note that reference numeral 11A denotes one ring in the longitudinal direction, reference numeral 11B denotes the other ring in the longitudinal direction, reference numeral 14A denotes one expansion prevention member attached to one ring 11A, and reference numeral 14B denotes the other expansion prevention member attached to the other ring 11B. Note that in Fig. 1A(a)(b), one expansion prevention member 14A is shown in a state where it is not attached to one ring 11A, and the other expansion prevention member 14B is shown in a state where it is attached to the other ring 11B.

[0037] The ring portion 11 is formed by bending the wire 10a forming the rod body 10 into a hairpin curve that forms an S-shape as a whole. The specific configuration of the hairpin curved ring portion 11 will be described below using one ring portion 11A as an example. One ring portion 11A is composed of a curved portion 12a formed by bending the wire 10a into a curved shape with a radius r1 at one outer end of the rod body 10, an extension portion 12b extending from the curved portion 12a toward the other outer end that is the opposite end of the rod body 10 in the axial direction, an outer portion 12d bent from the tip of the extension portion 12b via a bending portion 12c to the outside (the opposite side to the rod body 10) and extending toward one outer end of the rod body 10, and an elongated space portion 12e provided between the extension portion 12b and the outer portion 12d. The elongated space 12e is configured such that the other outer end side (the axial center side of the rod body 10) is closed by the bent portion 12c. The extension 12b is inclined with respect to the rod body 10, and the distance between the extension 12b and the rod body 10 narrows from the curved portion 12a side toward the bent portion 12c side. In this embodiment, the bent portion 12c side of the extension 12b is configured to be in approximate contact with the rod body 10. The space between the extension 12b and the rod body 10, including the curved portion 12a, is referred to as the curved portion space 12f.

[0038] When an external force F1 is applied to the curved portion 12a of the ring portion 11 in the axially outward direction, a force is applied that raises the extended portion 12b, which is bent relative to the extended portion 12b. This causes the curve of the curved portion 12a to change to a straight line, and there is a risk that the ring portion 11 will disappear. The expansion prevention member 14 is provided between the rod body portion 10 and the extended portion 12b, and prevents the extended portion 12b from expanding relative to the rod body portion 10 when the extended portion 12b is raised relative to the rod body portion 10.

[0039] In this embodiment, as shown in Fig. 1A(c)(d), the expansion prevention member 14 is formed into a coil spring-shaped helical structure in which a wire is wound in a helical shape with an inner diameter D1 at a pitch P1 in a clockwise direction multiple times. The pitch P1 of the expansion prevention member 14 is formed to be larger than the outer diameter of the wire 10a of the rod body main body 10. In addition, if the distance between the rod body main body 10 and the extension portion 10b on the curved portion 12a side is H1, the outer diameter of the curved portion 12a is H2, and the distance between the rod body main body 10 and the extension portion 10b between the distance H1 and the distance H2 is H3, the inner diameter D1 of the inner diameter portion 14a of the expansion prevention member 14 is the distance H3. However, the inner diameter D1 is a value such that the entire length of the expansion prevention member 14 fits into the extension portion 12b.

[0040] 1B, a method for attaching the expansion prevention member 14 formed in a spiral structure to the ring portion 11. Note that the case where the other expansion prevention member 14B is attached to the other ring portion 11B will be described, but the case where one expansion prevention member 14A is attached to one ring portion 11A will be omitted since it is similar.

[0041] In FIG. 1B, the method of attaching the other expansion prevention member 14B to the other ring portion 11B is performed in the order of (a) to (e) in FIG. 1B, and finally, it is attached as shown in (f) in FIG. 1B. First, as shown in (a), the operator positions the other expansion prevention member 14B outside the curved portion 12b of the other ring portion 11B, and inserts the tip of the expansion prevention member 14B into the curved portion 12b. Next, as shown in (b), the other expansion prevention member 14B is rotated clockwise, and the rod body main portion 10 is screwed toward the one ring portion 11A while being accommodated in the inner diameter portion 14a. When the other expansion prevention member 14B is further screwed, as shown in (c), the other expansion prevention member 14B is accommodated in the curved portion space 12f including the curved portion 12a between the extension portion 12b and the rod body main portion 10 over its entire length.

[0042] Next, the other expansion prevention member 14B is pushed straight toward the one ring portion 11A, and as shown in (iv), the other expansion prevention member 14B is pushed out from the curved portion space 12f toward the one ring portion 11A. By the way, there is no gap between the end of the extension portion 12b on the bent portion 12c side and the rod body portion 10, or even if there is a gap, it is narrower than the wire diameter of the wire of the other expansion prevention member 14B, making it a zero-gap portion that can be said to be almost zero. For this reason, when moving from (iii) to (iv), it seems that the other expansion prevention member 14B cannot pass through this zero-gap portion. However, since the other ring portion 11B is formed in a hairpin shape, the extension portion 12b acts as a spring, and when the tip of the other expansion prevention member 14B is pressed against the zero-gap portion, the zero-gap portion is pushed out by a wedge action, and the other expansion prevention member 14B can pass through the zero-gap portion.

[0043] Thereafter, as shown in (E), the other end of the other expansion preventing member 14B is inserted into the bent portion 12c, the other expansion preventing member 14B is rotated clockwise, and the other end side of the other expansion preventing member 14B is inserted into the elongated space portion 12e. In this state, the rod body portion 10 and the extension portion 12b are accommodated in the inner diameter portion 14a of the other expansion preventing member 14B, and the other expansion preventing member 14B is further rotated clockwise to screw the other expansion preventing member 14B forward, and as shown in (F), the entire length of the other expansion preventing member 14B is completely accommodated in the elongated space portion 12e.

[0044] When the entire length of the other expansion prevention member 14B is contained within the elongated space 12e and the rod body portion 10 and the extension portion 12b are contained within the inner diameter portion 14a of the other expansion prevention member 14B, the other expansion prevention member 14B surrounds the rod body portion 10 and the extension portion 12b. As a result, as shown in (F), even if an external force (pulling force) F1 acts on the other ring portion 11B toward the axial outward direction of the rod body portion 10 and a force acts on the extension portion 12b in the lifting direction on the rod body portion 10, the rotation of the other expansion prevention member 14B in the lifting direction is prevented and the curved structure of the curved portion 12a is maintained.

[0045] Furthermore, since the inside of the elongated space portion 12e is blocked by the bent portion 12c, the other expansion prevention member 12B will not slip out of the elongated space portion 12c.

[0046] In this embodiment, when the entire length of the other expansion prevention member 14B is contained within the elongated space portion 12e, the length of the other expansion prevention member 14B or the length of the elongated space portion 12e is set so that the other end of the other expansion prevention member 14B does not enter the area of ​​radius r1 (diameter 2r1) of the curved portion 12a.

[0047] 2(a) and 2(b), the rod 1 is inserted in advance into the environmental conservation material 20. The environmental conservation material 20 has a hollow portion 21 through which the rod 1 is inserted, for example, in the radial center, and is formed into a skeleton structure in which steel wires are stretched three-dimensionally around the axis of the hollow portion 21 and along the longitudinal direction of the hollow portion 21 in the radial direction, or wire mesh is further wound around the hollow portion 21. The rod 1 is normally attached in a state in which the curved portions 12a of one ring portion 11A and the other ring portion 11B are exposed outward from both longitudinal ends of the environmental conservation material 20.

[0048] As described above, the environmental conservation material 20 is placed horizontally, for example on a slope of a mountainside, in order to prevent soil erosion caused by rainwater, etc., on slopes, with its longitudinal direction aligned perpendicular to the flow direction of soil, gravel, etc.

[0049] Since the installation site of the environmental conservation materials 20 is a desolate area where landslides have occurred or are likely to occur on the mountaintop or mountainside, they are transported to the installation site by hand along forest roads or mountain paths that trucks can pass through, or by using a monorail or the like. In this case, from the viewpoint of work safety, the size that can be transported is, for example, about 1 m (meter). For this reason, if the installation site is several meters wide, multiple environmental conservation materials 20 will be used by connecting them in series. Multiple environmental conservation materials 20 are connected in series by using the ring parts 11 of adjacent rod bodies 1, but most of the installation sites of the environmental conservation materials 20 are inclined surfaces with poor footing. For this reason, the connecting device of the rod bodies 1 is designed to allow the connection work to be performed without using tools such as wrenches. Similarly, the connection of the rod bodies 1 to anchors fixed to the ground or the like can be performed without using tools such as wrenches.

[0050] 3 shows an embodiment in which three first to third environmental conservation materials 20 (20A, 20B, 20C) with first to third rod bodies 1 (1A, 1B, 1C) previously attached thereto are connected in series by a connecting device 30 (30A, 30B). The first environmental conservation material 20A and the second environmental conservation material 20B are connected by the first connecting device 30A, and the second environmental conservation material 20B and the third environmental conservation material 20C are connected by the second connecting device 30B.

[0051] In addition, the first rod 1A attached to the first environmental conservation material 20A has a first anchor 40A connected to one ring 11A by the first anchor connecting device 30C, and the third rod 1C attached to the third environmental conservation material 20C has a second anchor 40B connected to the other ring 11B by the second anchor connecting device 30D. Note that, in the rod 1, one ring is designated by the symbol 11A and the other ring is designated by the symbol 11B, but this is given for convenience to facilitate explanation, and either ring 11 may be the one ring or the other ring. In addition, the first anchor connecting device 30C and the second anchor connecting device 30D have the same structure as the first connecting device 30A.

[0052] The structure of the rod connecting device 30 will be described with reference to Figures 4, 5 and 6. In Figure 4, the rod connecting device 30 is composed of a connecting pin 31 made of a threaded steel bar, and a first upper screw body 32A and a first lower screw body 32B of a helical structure that screw into the thread joint of the connecting pin 31 (described later). The first upper screw body 32A and the first lower screw body 32B have the same structure. The threaded steel bar is specified in JIS G3112-2020, and as shown in Figures 4(a) and (b), a joint (node) 31b is formed in a helical shape, for example a right-handed screw, at a pitch P2 on the outer circumferential surface of a pin body 31a having a diameter D2. The pin body 31a is formed, in cross section, by a first opposite side 31c and a second opposite side 31d, each of which has a flat side, and a third opposite side 31e and a fourth opposite side 31f, each of which is formed as an arc-shaped surface of the same radius and connected to the first opposite side 31c and the second opposite side 31d. The connecting pin 31 is formed with a screw joint 31g, in which a helical joint 31b is formed on the surface of the third opposite side 31e and the fourth opposite side 31f at a pitch P2. The outer diameter of the screw joint 31g is D3.

[0053] The diameter (2r1) of the curved portion 12a having a radius r1 formed in the ring portion 11 of the rod body 1 is formed to be larger than the outer diameter D3 of the thread joint 31g, so that the ring portion 11 can be inserted into the connecting pin 31 and rotated.

[0054] The upper first screw body 32A and the lower first screw body 32B are each composed of a cylindrical screw body main body 34 formed by winding a wire rod with a circular cross section in a spiral shape with a pitch P3 in a clockwise direction with a number of turns to form a circular inner circumference 33, and a first arm portion 35 extending from a first terminal wire rod 34a at one end side of the screw body main body 34. As the wire rod for the screw body main body 34, an iron wire or a steel wire (stainless steel wire, galvanized steel wire, zinc-aluminized steel wire, etc.) is used.

[0055] The pitch P3 of the threaded body main body 34 is the same as or slightly larger than the pitch P2 of the thread joint 31g. The wire ends at both ends of the threaded body main body 34 are open (hereinafter referred to as open ends).

[0056] The upper first screwing body 32A and the lower first screwing body 32B are screwed into the connecting pin 31 while holding the first arm portion 35 by hand. Let the inner diameter of the screwing body main body portion 34 be D4, the outer diameter be D5, and the wire diameter of the wire be dw. The inner diameter D4 is set to be larger than the diameter D2 of the pin main body 31a of the connecting pin 31 and smaller than the outer diameter D3 of the collar (D2 < D4 < D3). The wire diameter dw of the wire of the upper first screwing body 32A and the lower first screwing body 32B is set to be smaller than the pitch P2 between the screw collars 31g, and a gap T is set so that each turn is not a tightly wound state where adjacent wires contact each other.

[0057] The diameter (2r1) of the curved portion 12a with a radius r1 formed in the ring portion 11 of the rod body 1 is made smaller than the outer diameter D5 of the screwing body main body portion 34 so as not to come out of the screwing body main body portion 34.

[0058] Since the node 31b of the connecting pin 31 is formed with a trapezoidal cross section, if the inner diameter of the inner diameter portion 33 of the screwing body main body portion 34 is increased, a gap is generated between the wire on the inner peripheral surface side of the screwing body main body portion 34 and the node 31b. Also, if the wire diameter dw of the wire is decreased, the gap between the wire and the node 31b will further expand. In the present embodiment, the wire diameter dw of the screwing body main body portion 34 is set so as to have play in the radial direction and the axial direction with respect to the connecting pin 31. Therefore, by simply lightly holding and turning the first arm portion 35 by hand, the upper first screwing body 32A and the lower first screwing body 32B can be screwed onto the connecting pin 31.

[0059] When the upper first screwing body 32A and the lower first screwing body 32B are screwed in the tightening direction, they rotate clockwise with respect to the connecting pin 31. At this time, the wire of the inner diameter portion 33 of the screwing body main body portion 34 that is screwed into the connecting pin 31 always makes frictional contact with the node 31b of the screw collar 31g. Then, when the first arm portion 35A is held and the upper first screwing body 32A and the lower first screwing body 32B are rotated clockwise, the wire wound clockwise around the screwing body main body portion 34 curves in a direction of expanding outward in the radial direction. Therefore, the inner diameter D4 of the inner diameter portion 33 of the screwing body main body portion 34 becomes a state of being loose-wound (referred to as a loose-wound state). Thus, the upper first screwing body 32A and the lower first screwing body 32B smoothly screw onto the screw collar 31g of the connecting pin 31.

[0060] When the rotation of the upper first screw 32A and the lower first screw 32B in the clockwise direction is stopped, the inner diameter portion 33 of the screw body main body 34 in the overwound state returns to the original inner diameter D4, and the upper first screw 32A and the lower first screw 32B stop at that position. When the first arm portion 35A is gripped by hand from this stopped state and the upper first screw 32A and the lower first screw 32B are rotated in the counterclockwise direction, the wire wound around the clockwise screw of the screw body main body 34 is curved in a direction contracting toward the inside in the radial direction, and a force acts in a direction decreasing the inner diameter D4 of the inner diameter portion 33 of the screw body main body 34, so that the inner diameter portion 33 of the screw body main body 34 tightens the connecting pin 31, and the upper first screw 32A and the lower first screw 32B do not move. This prevents the upper first screw body 32A and the lower first screw body 32B from coming off the connecting pin 31.

[0061] FIG. 5 is a front view showing the state in which adjacent rod bodies 1 are connected by the rod body connecting device 30, and an example will be described in which the first rod body 1A and the second rod body 1B are connected by the first connecting device 30A. In FIG. 5, when the connecting pin 31 is used standing upright as shown in FIG. 3(a)(b), the lower first screw body 32B is screwed into the connecting pin 31 in advance. At that time, the first arm part 35A of the lower first screw body 32B is positioned upward and screwed into the connecting pin 31. The first wheel part 11A of the second rod body 1B is inserted from the upper end side of the connecting pin 31 to which the lower first screw body 32B is screwed in advance. At that time, the curved part 12a of the first wheel part 11A is inserted into the connecting pin 31. Next, the second wheel part 11B of the first rod body 1A is inserted into the connecting pin 31. Then, the upper first screw body 32A is fitted onto the upper end side of the connecting pin 31 with the first arm portion 35A facing upward, and while holding the first arm portion 35 with the hand, it is turned clockwise to screw the upper first screw body 32A toward the second wheel portion 11B of the first rod body 1A.

[0062] The upper first screw body 32A stops screwing when the second wheel portion 11B of the first rod body 1A and the first wheel portion 11A of the second rod body 1B are sandwiched between the upper first screw body 32A and the lower first screw body 32B with almost no play. In this state, the second wheel portion 11B of the first rod body 1A and the first wheel portion 11A of the second rod body 1B are arranged between the upper first screw body 32A and the lower first screw body 32B without coming off the connecting pin 31. When screwing the upper first screw body 32A into the connecting pin 31, for example, by holding the lower end side of the connecting pin 31 with one hand and turning the upper first screw body 32A with the other hand, the upper first screw body 32A can be reliably screwed into the connecting pin 31. The second rod body 1B and the third rod body 1C are also connected by the second connecting device 30B.

[0063] As a result, the first rod body 1A, the second rod body 1B, and the third rod body 1C are connected in series. Also, since the first wheel portion 11A and the second wheel portion 11B attached to the connecting pin 31 are independently rotatable with respect to the connecting pin 31, when the first environment conservation material 20A, the second environment conservation material 20B, and the third environment conservation material 20C are placed on the ground, depending on the condition of the installation surface, the first environment conservation material 20A, the second environment conservation material 20B, and the third environment conservation material 20C may not be placed straight on the same axis, and may have to be placed with their orientations slightly changed.

[0064] In addition, even if the equipment can be installed straight at the beginning of installation, in order to ensure that the force of flowing soil, gravel, etc. is applied uniformly to the three rod bodies 1 attached to the three environmental conservation materials 20, it is possible to install the three rod bodies 1 (1A, 1B, 1C) connected with the first and second anchors 40A, 40B at both ends as fulcrums so that they form an overall curved surface.

[0065] Furthermore, since the connecting device 30 (30A, 30B) allows the first wheel portion 11A and the second wheel portion 11B to tilt up and down with the connecting pin 31 as a fulcrum, the first environmental conservation material 1A, the second environmental conservation material 1B, and the third environmental conservation material 1C can each be tilted up and down relative to the installation surface.

[0066] Next, the first anchor connecting device 30C, which connects the first ring portion 11A of the first rod body 1A to the first anchor 40A, and the second anchor connecting device 30D, which connects the second ring portion 11B of the third rod body 1C to the second anchor 40B, have the same structure, and Figure 7 shows the second anchor connecting device 30D.

[0067] 7, the second anchor 40B has the same structure as the connecting pin 31 of the connecting device 30, but differs from the connecting pin 30 in that its lower end is pointed. The second anchor connecting device 30D is basically configured the same as the first connecting device 30A, and the second ring portion 11B of the third rod body 1C is inserted into the second anchor 40B.

[0068] Here, among the first rod body 1A, the second rod body 1B, and the third rod body 1C, the connecting pin 31 is inserted only into one (other) ring portion 11A (11B) of the first rod body 1A and the third rod body 1C, and the first anchor 40A and the second anchor 40B are inserted into the other (other) ring portion 11B (11A). The second anchor 40B is driven into the ground in advance.

[0069] The second anchor connecting device 30D has an upper second screw body 32C and a lower second screw body 32D. The upper second screw body 32C and the lower second screw body 32D equipped with the second arm portion 35B have the same configuration as the upper first screw body 32A and the lower first screw body 32B equipped with the first arm portion 35A, and therefore a description thereof will be omitted.

[0070] In the second anchor connecting device 30D, the second wheel portion 11B of the third rod-shaped body 1C is inserted between the upper second screw body 32C and the lower second screw body 32D. The lower second screw body 32D is screwed to the second anchor 40B before the second anchor 40B is driven into the ground, or is screwed to the second anchor 40B after the second anchor 40B is driven into the ground. Then, the second wheel portion 11B of the third rod body 1C is inserted from the upper end of the second anchor 40B, and finally the upper second screw body 32C is fitted into the second anchor 40B from the upper end side, and the second wheel portion 11B is screwed forward until it is sandwiched between the upper second screw body 32D and the lower second screw body 32D and then stopped. The same is done for the first anchor connecting device 30C.

[0071] In this embodiment, the opening surfaces of the first ring portion 11A and the second ring portion 11B of the first rod body 1A, the second rod body 1B, and the third rod body 1C are arranged in the same plane, so that the first ring portion 11A and the second ring portion 11B can be inserted in the vertical direction through the connecting pin 31 and the first anchor 40A and second anchor 40B of the connecting device 30, which face in the vertical direction, making the connecting work easy.

[0072] In this embodiment, the operation of screwing the first upper screw body 32A and the first lower screw body 32B into the connecting pin 31 during the connecting operation can be performed by hand without using tools such as pliers or wrenches. Therefore, in a situation where it is difficult to stand on a slope such as an installation site of the environmental conservation material 20, where the footing is easily collapsible and the sand is sandy, the first upper screw body 32A and the first lower screw body 32B can be easily screwed together to quickly connect the first rod body 1A and the second rod body 1B, and the second rod body 1B and the third rod body 1C.

[0073] Furthermore, since the upper first screw body 32A and the lower first screw body 32B are screwed into the connecting pin 31 with some play, they can be screwed together without failure by simply aligning the tips of the upper first screw body 32A and the lower first screw body 32B with the tip of the connecting pin 31. In particular, when working from above while wearing gloves, the upper first screw body 32A and the lower first screw body 32B can be screwed together safely without dropping them.

[0074] The same applies to the screwing operation of the upper second screw body 32C and the lower second screw body 32D to the first anchor 40A and the second anchor 40B.

[0075] An embodiment of the environmental conservation material 20 shown in FIGS. 2 and 3 is shown in FIG.

[0076] The environmental conservation material 20 is composed of a first helical structure (parent helical structure) 22 having a structure in which a first wire 21 is wound cylindrically in a number of turns at a predetermined pitch, and a second helical structure (child helical structure) 24 having a second wire 23 wound cylindrically in a number of turns at a predetermined pitch. The parent helical structure 22 is formed with an inner diameter portion 22a. The child helical structure 24 is formed with a cylindrical inner diameter portion 24a.

[0077] In the environmental conservation material 20 of this embodiment, the inner diameter portion 24a of the child helical structure 24 is inserted into the first wire 21 of the parent helical structure 22, and the child helical structure 24 is housed between both ends of the first wire 21 of the parent helical structure 22. A plurality of loop-shaped trapping portions 25 are formed by the second wire 23 radially outward from the parent helical structure 22. In the trapping portions 25, a loop-shaped loop space 25a is formed between the entangled portions of one period with respect to the first wire 21 by the second wire 23. The loop space 25a has a substantially elongated elliptical shape in a front view from the open end side of the parent helical structure 22 as shown in FIG. 8(a), and has a substantially elliptical shape in a side view from an oblique side surface of the parent helical structure 22 as shown in FIG. 8(b).

[0078] In the environmental conservation material 20, the first wire 21 of the parent helical structure 22 is inserted into the inner diameter portion 24a of the child helical structure 24, and the child helical structure 24 is disposed between both ends of the first wire 21. At this time, the first wire 21 and the second wire 23 are entangled with each other due to the elastic restoring force of the second wire 23, and a plurality of trapping portions 25 that form loop-shaped loop spaces 25a are formed by the second wire 23 at a predetermined pitch. In addition, a rod 1 is inserted into the parent helical structure 22.

[0079] In the environmental conservation material 20, the flowing soil and gravel, including fallen leaves and branches, are captured in the capture section 25 and contained within the loop space 25a and the parent spiral structure 22, but water passes through. Then, soil accumulates on the front side of the environmental conservation material 20 where the flowing soil and gravel hit. This makes it possible to prevent soil erosion at the installation site of the environmental conservation material and promote the restoration of devastated land.

[0080] As a modified example of the environmental conservation material shown in FIG. 8, an outer periphery net made of a mesh member such as a diamond-shaped wire net can be wrapped around and covered around the outer periphery of the environmental conservation material 20 shown in FIG. 8. The inner surface of the outer periphery net abuts on the tip of the capture portion 25 of the environmental conservation material 20, and the outer periphery net is urged radially outward. Therefore, the outer periphery net covers the outer periphery of the environmental conservation material 20 in a tensed state. The environmental conservation material with the net is placed on the ground with its longitudinal direction perpendicular to the flow direction of the soil and gravel. If the soil and gravel that flows with rainwater contains fallen leaves and branches, the environmental conservation material with the net captures the soil and branches, and the fallen leaves and branches get caught in the outer net, and sedimentation begins on the front side (upstream side) of the spiral structure with the net. The fallen leaves and branches caught in the outer net function as a filter that allows water to pass but not soil, and the period of sedimentation on the front side of the environmental conservation material with the net is accelerated.

[0081] In addition, since the net-attached environmental conservation material has a cylindrical outer net, it is not necessary to use a specific outer surface as the installation surface, and any outer surface can be used as the installation surface. The outer net may be made of not only diamond-shaped wire mesh, but also tortoiseshell wire mesh or a lattice-like mesh.

[0082] FIG. 9 shows a second embodiment of a rod according to the invention.

[0083] The rod body 100 of the second embodiment shown in Figure 9 has a first wheel portion 11A and a second wheel portion 11B formed at both ends of the rod body main body 10, which are arranged rotationally symmetrically with the longitudinal center of the rod body main body 10 as the rotation fulcrum.

[0084] FIG. 10 shows a third embodiment of a rod according to the invention.

[0085] The buffer section 13 of the rod body 1 of the first embodiment shown in Fig. 1 is formed in a wave shape, but the rod body 110 of the third embodiment shown in Fig. 10 has a buffer section 13A formed in the center of the rod body main body 10 in a curved shape. Compared to the buffer section 13 of the first embodiment, the work of forming the buffer section 13A in a curved shape can be performed easily.

[0086] FIG. 11 shows another embodiment of a rod connecting device according to the invention.

[0087] In the rod body connecting device 30 shown in Figures 3 to 7, a connecting pin 31 is inserted through the second wheel portion 11B of the first rod body 1A and the first wheel portion 11A of the second rod body 1B, which are connected in series, and another connecting pin 31 is inserted through the second wheel portion 11B of the second rod body 1B and the first wheel portion 11A of the third rod body 1C, which are respectively clamped by an upper first screw body 32A and a lower first screw body 32B.

[0088] In contrast, the rod body connecting device 50 (50A, 50B) shown in Fig. 11 has basically the same structure as the connecting device 30 described above, but differs in that a first supporting rod body 110D and a second supporting rod body 110E, which have the same structure as the rod body 110, are further connected to the connecting pins 31 of one connecting device 50 (50A) and the other connecting device 50 (50B). Note that in the connecting device 50 shown in Fig. 11, the rod body is the rod body 110 shown in Fig. 11, but the rod body 1 shown in Fig. 1 may also be used.

[0089] The second wheel portion 11B of the first supporting rod 110D is inserted into the connecting pin 31 of one connecting device 50A. The first supporting rod 110D is disposed at an arbitrary angular position between the first rod 110A and the second rod 110B which are connected substantially in series via the connecting pin 31 with the connecting pin 31 at the center.

[0090] In this embodiment, the first supporting rod 110D is disposed at a right angle to the first rod 110A and the second rod 110B which are connected substantially in series. The first supporting rod 110D is disposed such that one of the rings 11A is disposed upstream in the direction of flow of the soil and gravel from the position where the environmental conservation material 20 is disposed. The second supporting rod 110E is disposed on the connecting pin 31 of the other connecting device 50B in the same manner as the first supporting rod 110D.

[0091] The first ring parts 11A of the first supporting rod body 11D and the second supporting rod body 110E are inserted into the third anchor 40C and the fourth anchor 40D, respectively, and are clamped by the upper second screw body 32C and the lower second screw body 32D, as in the second anchor connecting device 30D shown in Fig. 7. The third anchor 40C and the fourth anchor 40D receive pressure from the flowing soil and gravel applied to the first rod body 110A, the second rod body 110B, and the third rod body 110C, which are connected in series via the first supporting rod body 11D and the second supporting rod body 11E, and support the first environmental conservation material 20A, the second environmental conservation material 20B, and the third environmental conservation material 20C so that they do not flow away.

[0092] In the embodiment shown in Fig. 3, the first anchor 40A and the second anchor 40B prevent the environmental conservation materials 20 (20A, 20B, 20C) from being washed away by the pressure of soil and gravel, etc., but if this alone is not sufficient, the first wheel parts 11A of the first supporting rod body 11D and the second supporting rod body 110E can be connected to the third anchor 40C and the fourth anchor 40D, so that the environmental conservation materials 20 (20A, 20B, 20C) can be placed in a predetermined position for a long period of time. However, the first supporting rod body 110D and the second supporting rod body 110E do not need to be in the same angular position, and may be in different angular positions.

[0093] Other embodiments of the rod connection according to the invention The rod body connection modes in each of the above-mentioned embodiments are a linear connection mode in which two rod bodies 1 are linearly connected by the connecting pin 31 of the connecting device 30, and a T-shaped connection mode in which three rod bodies 110 are T-shaped connected by the connecting pin 31 of the connecting device 31, but the connection modes of the rod bodies 1 (100, 110) are not limited to these, and other connection modes of the rod bodies will be described below. Note that the rod body 120 used in the other connection modes shown in Figures 12, 13, 14, 15, and 16 is configured so that the rod body main body 10 does not have a buffer section 13.

[0094] 12 shows a first embodiment of another rod body connection mode, in which connecting pins 31 of a connecting device 30 are arranged at each corner of a rectangular frame 120A forming a rectangle, and loop portions 11 of four rod bodies 120 are inserted into each connecting pin 31, and the rod bodies 120 connected to each connecting pin 31 are arranged at angular intervals of 90 degrees around the connecting pin 31. That is, the grid connection mode of this embodiment is a configuration in which three rod bodies 120 are connected vertically by connecting devices 30 in two columns, and three rod bodies 120 are connected horizontally by connecting devices 30 in two rows.

[0095] The environmental conservation materials 20 having the configuration shown in Fig. 2 may be attached to all of the rods 120, or may be attached to each of the rods 120 constituting the central rectangular frame 120A, or conversely, may be attached to the other rods 120 except for the rods constituting the central rectangular frame, or may be attached to appropriate rods 120 depending on the conditions of the installation area of ​​the environmental conservation materials 20. With the grid-like connection pattern shown in Fig. 12 as the basic form, multiple rows (three or more) and multiple columns (three or more) may be arranged vertically and horizontally.

[0096] 13 shows a second embodiment of another connecting aspect of rod bodies according to the present invention, in which a rectangular frame 121 formed by connecting devices 30 arranged at six locations, six frame rod bodies 120 (120a), and a central rod body 120 (120b) arranged at a position that divides the rectangular frame 121 into two square areas 122 in the longitudinal direction. This configuration is called a rectangular frame connecting body 123.

[0097] Corner connectors 30 (30E) arranged at the four corners of the rectangular frame 121 connect two frame rods 120a at a 90-degree angle with connector pins 31. Two rectangular frame rods 120a forming the long axis arranged side by side in the row direction of the rectangular frame 121 and a center rod 120 (120b) are connected with connector pins 31 of a center connector 30 (30F). That is, the center connector 30F connects the two frame rods 10a and the center rod 120b in a T-shaped connection manner.

[0098] 13, the rings 11 provided at both ends of all the rods 120 are inserted into the connecting pins 31 of the connecting device 30. For this reason, some of the connecting pins 31, for example the connecting pins 31 at the four corners, may be made longer so as to be stuck into the ground. The environmental conservation materials 20 may be attached to all the rods 120 (120a, 120b), for example.

[0099] 13 is the upstream side in the direction of soil and gravel flow, the characteristics of the environmental conservation materials 20 (not shown) attached to the rods 120a extending in the column direction of the rectangular frame connecting body 123 and arranged on the upstream, midstream, and downstream sides in the row direction, for example, the sizes of the soil and gravel to be captured are made different, with large, medium, and small sizes in that order from the upstream side to the downstream side. As a result, large soil and gravel accumulate upstream of the rods 120a located upstream, medium soil and gravel accumulate in the square area 122 upstream of the central rod 120b located midstream, and small soil and gravel accumulate in the square area 122 upstream of the rods 120a located downstream.

[0100] The two rods 120a arranged on both sides of the rectangular frame connecting body 123 in the column direction and extending along the row direction support the pressure of soil and gravel applied to the environmental conservation materials 20 provided midstream and downstream.

[0101] Furthermore, the connecting body having the rod bodies connected as shown in Figs. 12 and 13 can also be used as a frame by standing it vertically on the ground.

[0102] Fig. 14 shows a third embodiment of another connecting aspect of the rod body according to the present invention, in which a supporting rod body 120 (120c) is further connected to the rectangular frame connecting body 123 shown in Fig. 13. One ring portion 11A of the supporting rod body 120c is inserted into the connecting pin 31 of each connecting device 30 of the rectangular frame connecting body 123. The supporting rod body 120c connected to each connecting device 30 arranged in a 3 x 2 arrangement in the row and column directions extends obliquely in the column direction toward the outside with respect to the rectangular frame connecting body 123. The other ring portion 11B of the supporting rod body 120c is inserted into an anchor (not shown) and is prevented from coming off by an anchor connecting device (not shown).

[0103] Three rods 120 are connected to the connecting device 30E arranged at the corners of the rectangular frame connecting body 123, and four rods 120 are connected to the central connecting device 30F. The other ring portion 11 of the supporting rod 120c that is not inserted into the connecting pin 31 is inserted into, for example, an anchor (not shown), and the three rods 120 arranged in each row are connected in an overall curved state.

[0104] FIG. 15 shows a fourth embodiment of another rod connection mode according to the present invention, which is an embodiment of a parallelogram connection body 124 in which four rods 120 are connected to a parallelogram by connecting devices 30 arranged at four places. The four rods 120 are of equal length, and environmental conservation materials 20 are attached to the rods 120. For this reason, if one side of the place where the environmental conservation materials 20 (not shown) are to be installed is oblique, a gap will be created between the oblique side in the square connection body. For this reason, the parallelogram connection body 124 can be installed according to the inclination of the oblique side, and the environmental conservation materials 120 can be installed without creating a gap between the oblique side. In addition, the parallelogram connection body 124 can be used as an anchor by lengthening the connecting pins 31 of the connecting devices 30 and piercing them into the ground.

[0105] Fig. 16 shows a modification of the embodiment shown in Fig. 14. In the embodiment shown in Fig. 14, the rectangular frame connector 123 is divided into two square regions 122 by a central rod 120b. A supporting rod 120c is connected to a connecting device 30F that connects the central rod 120b.

[0106] In contrast, the connecting mode of the rods 120 shown in Fig. 16 is configured by removing the central rod 120b of the rectangular frame connecting body 123 shown in Fig. 14, and further removing the rod 120c connected to the connecting device 30F. That is, according to the connecting mode shown in Fig. 16, the environmental conservation material 20 (not shown) for capturing large-sized soil and gravel can be arranged on the rod 120a extending along the column direction located upstream of the rectangular frame connecting body 123, and the environmental conservation material 20 (not shown) for capturing small-sized soil and gravel can be arranged on the rod 120a located in the row direction separated by the length of two rods 120a. In this case, the two rods 120a arranged along the row direction can rotate about the connecting pins 31 of the connecting device 30E and the connecting device 30F, respectively, so that the installation position along the column direction of the environmental conservation material 20 (not shown) for capturing small-sized soil and gravel can be adjusted.

[0107] Fig. 17 shows a fifth embodiment of another connecting aspect of rod bodies according to the present invention. In each of the above-mentioned embodiments, for example, the environmental conservation material 20 is inserted into the rod body 1 (100, 110, 120) connected via the connecting device 30, but as shown in Fig. 17, the ring portion 11B of a rod body 130 for free connection, which has the same configuration as the rod body 1 (100, 110, 120), is inserted into the rod body 1 (100, 110, 120), and the rod body 130 for free connection is movable along the length direction of the rod body main body portion 10 of the rod body 1 (100, 110, 120). One or three or more rod bodies 130 for free connection may be provided for the rod body 1. [Explanation of symbols]

[0108] 1, 100, 110, 110A, 110B, 110C, 110, 120, 130: Rod 110D: First rod for support 110E: Second rod for support 1A, 1B, 1C: 1st to 3rd rod 120a, 120b: Rod 10: Rod body portion 10a: Wire material 11: Limbus 11A: 1st limbus 11B: 2nd limbus 12a: curved portion 12b: extending portion 12c: bent portion 12d: outer portion 12e: elongated space portion 12f: curved space portion 13, 13A: Buffer section 14: Expansion prevention member 14A: First expansion prevention member 14B: Second expansion prevention member 20:Environmental conservation material 21:First wire rod 20A, 20B, 20C: 1st to 3rd environmental protection materials 21: Hollow part 22: First helical structure (main helical structure) 22a: Inner diameter part 23: Second wire rod 24: Second helical structure (child helical structure) 24a: Inner diameter part 25: Capture section 25a: Loop space 30, 30E, 30F: Connection device 30A, 30B: 1st, 2nd connection device 30C: First anchor connecting device 30D: Second anchor connecting device 31: connecting pin 31a: pin body 31b: joint 31c: first opposite side 31d: 2nd opposite side 31e: 3rd opposite side 31f: 4th opposite side 31g: Screw joint 32A: Upper first screwed body 32B: Lower first screwed body 32C: Upper second screwed body 32D: Lower second screw body 33: Inner circumference portion 34: Screw body main body portion 34a: First terminal wire 35: First arm portion 35B: Second arm portion 40A: 1st anchor 40B: 2nd anchor 40C: 3rd anchor 40D: 4th anchor 50: coupling device 50A: one coupling device 50B: other coupling device 121: Rectangular frame 122: Square area 123: Rectangular frame connection 124: Parallelogram Link

Claims

1. A rod body portion formed in a long, thin, substantially straight rod shape having rigidity, such as a steel wire or a reinforcing bar; a ring portion provided at both ends of the rod body main body, the ring portion being bent from one axial end of the rod body main body toward the opposite axial end to form a curved portion curved at a predetermined radius, an extension portion extending from the curved portion toward the opposite axial end of the rod body main body, and further bent from a tip of the extension portion toward the one axial end of the rod body main body to form an S-shaped hairpin curve as a whole; An expansion prevention member is provided between the rod body main body and each of the extension portions, surrounding the rod body main body and each of the extension portions, and preventing movement of each of the extension portions in the expansion direction relative to the rod body main body; A rod body having the above structure.

2. The rod body according to claim 1, A rod body, characterized in that the ring portions provided at both ends of the rod body main body have flat surfaces of curved portions aligned in parallel.

3. The rod body according to claim 1, A rod body characterized in that a buffer portion that is deformed by an external force is provided on the rod body main body.

4. The rod body according to claim 1, A rod body, characterized in that each extension portion of the loop portion provided at both ends of the rod body main body is formed in a hairpin shape, and the tip portion is bent outward relative to the rod body main body.

5. 5. The rod body according to claim 1, wherein the expansion prevention member has a helical structure in which a wire is wound in a spiral shape with a plurality of turns at intervals.

6. A rod body connecting device for connecting a plurality of rod bodies according to claim 2, a connecting pin having a thread joint in which a spiral joint is formed on a surface of a first steel bar body at a predetermined pitch; a pair of first screw bodies each having a first screw body main body portion in which a wire rod to be screwed onto the connecting pin at an interval along the axial direction is wound in a spiral shape, and a spiral gap that screws into the thread joint of the connecting pin is formed between adjacent wire rods, the first screw body main body portion having an inner diameter larger than the diameter of the first steel bar main body and smaller than the diameter of the thread joint, the first screw body main body portion having a play in the axial direction relative to the thread joint, and an outer diameter larger than the inner diameter of the curved portion of the rod body; having A rod body connecting device characterized in that the ring portions of a plurality of rod bodies are overlapped, the connecting pin is inserted into each curved portion of each of the overlapped ring portions, and each of the overlapped ring portions is positioned between the pair of first screw bodies.

7. 7. The rod connecting device according to claim 6, A rod body connecting device, wherein at least one of the pair of first screw bodies has a first arm portion extending outward from one end side of the wire winding of the first screw body main body portion.

8. The rod connecting device according to claim 6 or 7, A rod connecting device characterized in that the multiple rods are connected in three to the connecting pin, two of the rods are connected approximately in series via the connecting pin, and the other rod is positioned at an arbitrary angular position between the two rods with the connecting pin as the center.

9. The rod connecting device according to claim 6 or 7, A rod connecting device characterized in that the inner diameter of the curved portion of the rod body is larger than the outer diameter of the connecting pin, and the rod body and the connecting pin are capable of rotating relatively around the axis of the connecting pin.

10. 7. The rod connecting device according to claim 6, an anchor having a screw joint in which a spiral joint is formed on a surface of a second steel bar body at a predetermined pitch; a pair of second screw bodies each having a second screw body main body portion in which a wire rod to be screwed onto the anchor at intervals in the axial direction is wound in a spiral shape, and a spiral gap that screws into the thread joint of the anchor is formed between adjacent wire rods, the second screw body main body portion having an inner diameter larger than the diameter of the second steel bar body of the anchor and smaller than the diameter of the thread joint, and having a play in the axial direction relative to the thread joint, and an outer diameter larger than the inner diameter of the curved portion of the rod body; having A rod connecting device characterized in that the connecting pin is inserted into only one of the ring portions of the multiple rod bodies, the anchor is inserted into the other ring portion of the rod body, and the other ring portion is positioned between the pair of second screw bodies.

11. The rod connecting device according to claim 10, A rod body connecting device, characterized in that at least one of the pair of second screw bodies has a second arm portion extending outward from one end side of the wire winding of the second screw body main body portion.

12. The rod connecting device according to claim 10 or 11, A rod connecting device characterized in that an inner diameter of the curved portion of the other ring portion of the rod inserted into the anchor is formed to be larger than an outer diameter of the anchor, and the rod and the anchor are capable of rotating relatively around the axis of the anchor.

13. 12. An environmental conservation material connection body, characterized in that environmental conservation materials are attached to the plurality of rods connected in series that constitute the rod connection device according to claim 10 or 11.

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