JP3081251U - Spiral anchor - Google Patents

Abstract

[PROBLEMS] To provide an inexpensive construction with a simple structure and a small number of parts and to facilitate the installation work, and to further secure the ground for anchors such as piles, signs, guardrails, telephone poles, etc. to be installed on the ground. Provide a spiral anchor designed to increase medium resistance. A spiral member (4) is fixed along the outer periphery of a tapered portion (3) of a pipe member (2) having a tapered portion (3) whose outer diameter narrows downward, and a large number of spouts are provided at appropriate locations on the pipe member (2). Are formed to guide the spiral member 4 when the spiral member 4 is rotationally pressed to the ground 10 and increase the underground resistance. By injecting concrete 8 from the upper opening 5, a large number of perforations 5, 5,...
The concrete pouring portion 11 poured out from the lower opening of the slab enters the surrounding ground 10 and is hardened.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a spiral anchor that enhances the underground resistance of anchors used for piles, signs, guardrails, utility poles, and the like that are erected on the ground.

[0002]

[Prior art]

 Fig. 6 shows a conventional anchor for fixing ground members, such as piles, signs, guardrails, and utility poles, to the ground such as soil or concrete.

This anchor is a pile anchor described in Japanese Patent Application Laid-Open No. 10-183617, and has a pile anchor 30 formed by forming a spiral blade 32 on the side of a straight steel pipe 31. The steel pipe 31 is formed by connecting a front end pipe 33 having a large outer diameter and a rear end pipe 34 having a small outer diameter, and a spiral blade 32 is arranged on a side of the front end pipe 33. Is provided with cutting teeth (cutter) 35 at the tip of the tip side pipe 33.

According to such a pile anchor 30, a pressure rotating device (not shown) is attached to the rear end side pipe 34 on which the spiral blade 32 is not provided, and the pile anchor 30 is rotated while being rotated. By pressing, the cutting teeth 35 at the tips rotate the spiral blades 32 while collapsing the soil, thereby guiding the entry into the ground and performing the driving. The wing plate 32 is designed to exert resistance in the ground.

[0005]

[Problems to be solved by the invention]

 By the way, in cold regions, the soil under snowfall expands due to freezing, and the force to push the anchor works in the ground. In such a case, the anchor installed in the ground cannot maintain its original upright state and may tilt or fall.

In the pile anchor 30 described above, the spiral wing plate 32 exerts a resistance force in the ground after driving, but the tip-side pipe 33 during the driving operation. Is formed to have a larger outer diameter than the rear end side pipe 34, the resistance to penetration into the ground becomes large, and the casting operation cannot be performed easily.

In order to compensate for such a drawback, in the above-described pile anchor 30, the cutting teeth 35 are provided at the tip, so that the cutting teeth 35 enter the soil while collapsing the soil. There is a disadvantage that the number of members increases.

In the pile anchor 30 described above, only the spiral wing plate 32 on the outer periphery of the distal end pipe 33 exerts a resistance in the ground, and the anchor is mounted in accordance with various changes in the ground. In order to maintain a stable state underground, the strength may be insufficient.

The present invention has been made in view of the above-mentioned conventional circumstances, and has a simple structure, a small number of parts, and is inexpensive, and the casting operation is easy. The purpose of the present invention is to provide a spiral anchor that enhances the underground resistance of anchors such as piles, signs, guardrails, and utility poles.

[0010]

[Means for Solving the Problems]

 In order to achieve the above object, the spiral anchor according to the first aspect of the present invention has a spiral member fixed along the outer periphery of the tapered portion of the pipe member having the tapered portion whose outer diameter is narrowed downward. At the same time, a large number of perforation holes are formed at appropriate places in the tapered portion to guide the spiral member when it is rotationally pressed to the ground, to enhance the underground resistance, and to enhance the ground resistance. By injecting concrete from the upper opening of the cast pipe member, the large number of perforation holes and the concrete pouring portion poured from the lower opening of the pipe member enter the surrounding ground and harden. It is characterized by having been made.

In the spiral anchor according to the second aspect of the present invention, according to the first aspect, the tip of the spiral member projects from the lower end of the pipe member and strikes in advance in the underground approach direction of the pipe member. It is characterized by being established.

[0012] The spiral anchor according to claim 3 of the present invention is characterized in that, in claim 1 or 2, there is provided a portion where the spiral member is not provided on the upper part of the pipe member, and a mounting member is provided on the upper part of the pipe member. Perforations are formed to attach ground members such as piles, signs, guardrails, or utility poles.

Further, the spiral anchor according to claim 4 of the present invention according to claim 1, 2 or 3, has a portion where the spiral member is not provided at an upper portion, and a mounting hole is formed at the upper portion. A large number of spiral anchors are cast at predetermined intervals, and these spiral anchors are connected to each other by spring members hooked on the mounting holes.

Further, the spiral anchor according to claim 5 of the present invention is characterized in that, in claim 1, 2, 3 or 4, the ground is soil, concrete before hardening or concrete with a vertical hole after hardening. And

[0015]

[Embodiment of the invention]

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In the spiral anchor 1 according to the present invention, as shown in FIG. 1, the spiral member 4 is fixed along the outer periphery of the tapered portion 3 of the pipe member 2 having the tapered portion 3 whose outer diameter narrows downward. , And a large number of perforation holes 5, 5,...

Then, as shown in FIG. 2, the spiral member 4 is guided while being pressed while being rotated on the ground 10, the underground resistance after the driving is enhanced, and By injecting concrete 8 from the upper opening 6a of the pipe member 2 cast at 0, a large number of perforations 5, 5,... And the concrete pouring portion 11 discharged from the lower opening 6b of the pipe member 2. Is made to penetrate into the surrounding ground 10 and is hardened, thereby further enhancing the underground resistance.

The spiral anchor 1 will be described in more detail. In FIG. 1, the inside of the pipe member 2 is made hollow by using a high-strength material such as steel or stainless steel for corrosion resistance. A formed tubular member may be used.

Further, the pipe member 2 is formed in a tapered shape narrowing in a lower end direction, and has an opening (upper opening 6a) at an upper end and an opening (lower opening 6b) at a lower end. Have been.

Although the tapered portion 3 of the pipe member 2 may be formed over the entire length, a ground member 16 (see FIG. 3) such as a stake, a sign, a guardrail or a utility pole is retrofitted on the upper part 7 of the pipe member 2. Considering that the pipe member 2 is fixed, it is preferable that the exposed portion of the pipe member 2 on the ground be a straight pipe. In this case, the upper end of the tapered portion 3 having a total length formed into a tapered shape may be connected to the lower end of the pipe portion forming the upper portion 7 of the pipe member 2 by welding to each other, or the whole may be formed by molding. It may be formed.

In any case, the spiral member 4 is fixed along the outer periphery of the tapered portion 3, and a large number of perforations 5, 5... Has a portion where the spiral member 4 is not provided in the upper part 7 of the pipe member 2, and is used as a ground exposed part at the time of casting. Further, mounting perforations 9, 9,. The ground member 16 (refer to FIG. 3) such as a stake, a sign, a guardrail, or a utility pole is attached by using this.

A spiral rope is used as the spiral member 4, and the inner diameter of the spiral member 4 is formed to be tapered in accordance with the outer diameter of the tapered portion 3 having the tapered shape. Weld along the entire outer circumference of the part 3.

The cross-sectional shape of the spiral member 4 may be a shape having an acute angle on the outside in addition to a rectangular shape, and the spiral member 4 may be configured to penetrate the hard ground 10 by rotating and pressing at the time of driving.

Further, the tip of the spiral member 4 is formed in a projecting portion 14 projecting from the lower end of the pipe member 2 so that the projecting portion 14 is driven in advance in the underground approach direction of the pipe member 2. ing.

The spiral anchor 1 configured as described above is applied to the ground 10 in which a vertical hole substantially corresponding to the outer diameter of the pipe member 2 is formed in the soil or the concrete before hardening, or the concrete after hardening. On the other hand, as shown in FIG. 2, when the rotary pressing is performed by a pressing rotary tool (not shown), the projecting portion 14 at the leading end of the spiral member 4 firstly precedes the ground 10 as shown in FIG. As a result, the positioning and straight-line approach at the time of driving are facilitated, and the spiral member 4 guides the ground 10 by cutting it.

In the placement of the spiral anchor 1, the lower portion of the pipe member 2 is formed to be tapered by the taper portion 3, and the spiral member 4 is also tapered according to the outer diameter of the tapered portion 3. Therefore, the resistance at the time of entering the ground 10 can be reduced, and the casting operation is facilitated.

Further, as shown in FIG. 2, by injecting ready-mixed concrete 8 from the upper opening 6 a of the pipe member 2 cast on the ground 10, a large number of perforation holes 5, 5. The concrete pouring portions 11, 11... Poured out from the lower opening 6b of the second 2 enter the surrounding ground 10, and act as an underground resistance to the ground 10.

The size of each concrete pouring portion 11 can be adjusted by the diameter of each pouring hole 5, 5, or the pressure of the ready-mixed concrete 8.

When the ground 10 is concrete, the concrete 8 inside the pipe member 2, the concrete pouring portions 11, 11... And the surrounding concrete ground 10 are assimilated and gradually hardened, so that the inside of the pipe member 2 is hardened. The concrete 8 and the surrounding concrete ground 10 are integrally joined, and it is possible to exhibit a stronger underground resistance.

FIGS. 3 (a) and 3 (b) show an application example of the spiral anchor 1 of the present invention, in which a mounting hole is provided in the upper part 7 of the spiral anchor 1 which is cast into the ground. 9, as the ground member 16, the support of the guardrail shown in FIG. 3 (a) is fixed with bolts 15, and the pipe-shaped piles, signs, and utility poles shown in FIG. By fixing with other joining materials, it becomes possible to be integrated with the spiral anchor 1 and to be erected on the ground.

FIGS. 4 and 5 show another application example of the spiral anchor 1 according to the present invention, in which a number of spiral anchors 1 are cast at predetermined intervals as described above. Of the spiral anchors 1, 1,... Are connected to the mounting holes 9, 9 by hooking the hook portions of the spring members 17 with each other. In such an example of use, it is desirable to form mounting holes 9 on all sides of the upper part 7 of the spiral anchor 1.

Then, by attaching the net 18 to the thus-installed spiral anchor and covering an inclined ground such as a cliff, falling rocks, landslides and the like can be prevented.

In such a facility situation, the underground resistance of each of the spiral anchors 1, 1... Jointly enhances the overall underground resistance, and anomalies that act intensively on a part of the ground. It becomes possible to counter external force with the whole resistance.

Although FIGS. 3 and 5 show that concrete is not injected into the spiral anchor 1 installed on the ground 10, such an installation is also possible. As shown in Fig. 2, it is possible to further increase the underground resistance by injecting concrete.

[0035]

[Effect of the invention]

 As described above, the spiral anchor according to the present invention has a spiral member fixed along the outer periphery of the tapered portion of the pipe member and a number of pouring holes formed at appropriate positions in the tapered portion. It provides guidance when the spiral member is pressed while being rotated on the ground, and enhances the underground resistance after casting.Since the only members used are the pipe member and the spiral member, it is simple. It can be constructed inexpensively with a simple structure and a small number of parts.

[0036] The spiral anchor of the present invention can be driven by rotary pressure into soil or concrete before hardening, or concrete ground having a vertical hole after hardening. This facilitates positioning and straight-line entry during driving ahead of the ground, and the spiral member can cut into the ground for guidance.

Further, the lower portion of the pipe member is formed to be tapered by the tapered portion, and the spiral member is also formed to be tapered in accordance with the outer diameter of the tapered portion. Is reduced, and the casting operation can be easily performed.

Further, by injecting concrete from the upper opening of the pipe member of the spiral anchor cast on the ground, a number of perforations for tapping around the outer periphery of the tapered portion and the concrete poured from the lower opening of the pipe member. By making the pouring part penetrate into the surrounding ground and harden, the underground resistance can be further enhanced.

Further, when the spiral anchor of the present invention is cast on concrete ground, the concrete inside the pipe member and the surrounding concrete ground are integrally joined to exhibit a stronger underground resistance. Becomes possible.

Further, the spiral anchor of the present invention has a portion where the spiral member is not provided at the upper part of the pipe member, and the pile, the sign, Ground members such as guardrails or utility poles can be firmly fixed.

Further, in the spiral anchor of the present invention, a number of spiral anchors each having a mounting hole formed at an upper portion are driven at predetermined intervals, and these spiral anchors are hooked to each other. By attaching a net to the spiral anchor that has been cast in this way and covering the sloped ground such as cliffs, falling rocks, landslides, etc. can be prevented. Each underground resistance jointly enhances the overall underground resistance, and it is possible to counter the extraordinary external force concentrated on a part of the ground with the overall resistance.

[Brief description of the drawings]

FIG. 1 is an overall side view of a spiral anchor according to the present invention.

FIG. 2 is a vertical cross-sectional view of the spiral anchor according to the present invention at the time of driving.

3 (a) and 3 (b) are side views showing an application example of the spiral anchor according to the present invention.

FIG. 4 is a top view showing another application example of connecting a spring member to spiral anchors according to the present invention.

FIG. 5 is a side view of FIG.

FIG. 6 is a side view of a conventional pile anchor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Spiral anchor 2 ... Pipe member 3 ... Taper part 4 ... Spiral member 5 ... Outlet perforation 6a ... Upper opening 6b ... Lower opening 7 ... Upper part of pipe member 8 ... Concrete (fresh concrete) 9 ... Perforation for mounting 10 ... Ground 11 Concrete discharging part 12 Net 14 Projecting part 15 Bolt 16 Ground member 17 Spring member 18 Net

Claims (5)

[Utility model registration claims] 1. A spiral member is fixedly provided along the outer periphery of the tapered portion of a pipe member having a tapered portion whose outer diameter is narrowed downward, and a large number of perforation holes are provided at appropriate places in the tapered portion. The spiral member guides the ground when the spiral member is rotationally pressed to the ground, increases the underground resistance, and injects concrete from the upper opening of the pipe member cast into the ground. The spiral anchor according to claim 1, wherein the plurality of perforation holes and the concrete pouring portion discharged from the lower opening of the pipe member enter the surrounding ground and are hardened. 2. The spiral anchor according to claim 1, wherein a tip end of said spiral member projects from a lower end of said pipe member and is preceded in the underground approach direction of said pipe member. 3. A pipe member is provided with a portion where no spiral member is provided above the pipe member, and a mounting hole is formed in the upper portion of the pipe member to mount a ground member such as a pile, a sign, a guardrail or a telephone pole. The spiral anchor according to claim 1 or 2, wherein 4. A plurality of spiral anchors, each having a location where a spiral member is not provided at an upper portion and having a mounting hole formed thereon, are cast at predetermined intervals, and these spiral anchors are mutually connected. The spiral anchor according to claim 1, 2 or 3, wherein the connection is made by a spring member hooked on the mounting hole. 5. The spiral anchor according to claim 1, wherein the ground is soil, concrete before hardening, or concrete having a vertical hole formed after hardening.