JP7083197B2 - Drive-in rotary spiral pile - Google Patents

Description

The present invention relates to a driven rotary spiral pile that can be buried in the soil while rotating by hitting the upper end with a hammer or the like and can exhibit a required pull-out resistance in the buried state.

The ones described in Patent Documents 1, 2 and 3 are examples of spiral piles used for pressing a sheet material such as a weed-proof sheet to the ground to fix it, or pressing and stabilizing a vinyl house or a tent curtain. Is provided.

As shown in FIG. 10, the spiral pile a1 according to Patent Document 1 includes a pile body b1 in which a metal wire is spirally bent and formed and the axis is in a vertical state, and is straight to the upper end c of the pile body b1. The vertical vertical portion d is erected in an upright state, and the base end f of the hook portion e for mounting another object is continuously provided at the upper end of the linear vertical portion d, and the front end portion of the hook portion e is provided. Has a configuration in which a falling piece h projecting downward is used, and a lower end bending portion k projecting toward the inward side of the hook portion e is continuously provided at the lower end j of the falling piece h by folding back. Was.

In the case of the spiral pile a1 having such a configuration, when the pile body b1 is rotated to bury it in the ground m, when the hook portion e is gripped by hand, the lower end bent portion k having a large area is described. The rotation operation can be performed by holding between the finger pad of the thumb and the finger pad of the index finger, and even when the rotation operation is continued by appropriately holding the finger pad, the lower end bending portion k having a large area can be held by the finger pad of the index finger. Since it can be carried out in contact with the pad of the finger or the finger pad of the thumb, there is an advantage that the pile body b1 can be easily rotated by hand.

However, in the case of the spiral pile a1, for example, when the weed-proof sheet n is fixed to the ground m, it is necessary to directly rotate and bury a large number of spiral piles a1 by hand as described above. There was a problem that the workability was inferior due to the labor required. Therefore, it is conceivable to rotationally bury the spiral pile a1 using an electric screwdriver.

As a spiral pile that can be used for that purpose, the spiral pile according to Patent Document 2 is provided. In the spiral pile a2, for example, as shown in FIG. 11, a vertically flat string mounting portion p is continuously provided on the pile body b2 at the upper end of the pile body b2 formed by bending a metal wire in a spiral shape. rice field. When the spiral pile a2 is buried or pulled out, the holding member q as shown in FIG. 11A is used. As shown in FIG. 11A, the holding member q includes a U-shaped holding portion s having a lower end opening at a distance capable of holding the string mounting portion p, and the U-shaped holding portion s is folded back. A mounting shaft portion w to be mounted on the chuck portion v (FIG. 11B) of the electric driver u was projected from the top portion t. In FIG. 11B, the mounting shaft portion w is mounted on the chuck portion v in a state where the holding member q is mounted on the string mounting portion p, and the electric screwdriver u is driven in this state to drive the spiral pile. It shows a state in which a2 is buried in the soil while rotating.

However, in this case, when rotating the spiral pile a2 and burying it in the soil, it is necessary to specially prepare a rotary tool such as the electric screwdriver u, and it is necessary to attach / detach it to / from the spiral pile a2. There was a problem that the work was troublesome, it took time and effort, and the workability was poor.

Patent Document 3 relates to a tapping type spiral pile a3, and as shown in FIG. 12, a pile body b3 having a spiral portion x made of a spiral-shaped wire rod at least on the front side and a base end of the pile body b3. It is provided with a tapping portion y provided in the portion and a sheet pressing portion z provided on the base end side of the pile body b3, and by tapping the tapping portion y with a hammer or the like, the spiral portion x thereof. The pile itself was configured to rotate and be driven into the ground. Regarding the diameter of the wire rod constituting the tapping type spiral pile a3 having such a configuration, it is only described in the embodiment that the diameter is 10 mm.

Therefore, when the weed-proof sheet laid on the ground is fixed to the ground by using the tapping type spiral pile, a large through hole having a diameter of at least 10 mm is formed in the weed-proof sheet. Therefore, the peripheral length of the gap generated between the outer peripheral surface of the pile body and the hole edge portion of the through hole is long. Therefore, there is a problem that grass grows in the gap portion. In addition, there is a problem that the strength of the weed-proof sheet is impaired because large holes are formed in the weed-proof sheet. In addition, since the tapping type spiral pile is constructed by using steel bars having a large wire diameter, there is a problem that the manufacturing cost is high.

Further, Patent Document 3 describes, as an example of the tapping portion, one having a bent piece bent in a horizontal linear shape at the upper end of the straight portion. It is not always easy to correctly strike the upper end of the bent piece toward the lower side in the axial direction of the spiral portion because the width of the upper end of the bent piece is small. There was a problem that it was difficult to perform stably.

Japanese Unexamined Patent Publication No. 2018-21312 Utility Model Registration No. 3191590 Japanese Unexamined Patent Publication No. 2020-10615

The present invention has been developed in view of the above-mentioned conventional problems, and can be reliably and efficiently buried in the soil while rotating by pressing the upper end with a hammer or the like, and the required extraction can be performed in the buried state. It can exert resistance, and when a sheet-like object such as a weed-proof sheet that has a surface shape is fixed to the ground, the fixing can be effectively performed only by making as small a hole as possible. An object of the present invention is to provide a driven rotary spiral pile that can be reduced in weight, improved in handleability, and reduced in manufacturing cost.

In order to solve the above problems, the present invention employs the following means.
That is, the first aspect of the driven rotary spiral pile according to the present invention is provided with a pile body in which a metal wire is bent in a spiral shape and the axis is in a vertical state, and a pressure portion is provided at the upper end portion of the pile body. Is provided, and the pile body is rotationally embedded in the soil by pressing the pressure portion downward, and the diameter of the metal wire is 2.8 to 5 mm. It is set, the spiral diameter of the pile body is set to 9 to 15 mm, the twist pitch length of the spiral is set to 35 to 65 mm, and the twist angle of the pile body with respect to the horizontal plane perpendicular to the axis is 50 to 72 degrees. It is characterized by being set to.

A second aspect of the driven rotary spiral pile according to the present invention is provided with a pile body in which a metal wire is bent in a spiral shape and the axis is in a vertical state, and a pressure portion is provided at the upper end portion of the pile body. It is a driven rotary spiral pile in which the pile body is rotationally embedded in the soil by pressing the pressure portion downward, and the diameter of the metal wire is set to 3.4 mm. The spiral diameter of the pile body is set to 13 mm, the twist pitch length of the spiral is set to 40 mm, and the twist angle of the pile body with respect to the horizontal plane perpendicular to the axis is set to 54.5 degrees. It is a feature.

A third aspect of the driven rotary spiral pile according to the present invention is provided with a pile body in which a metal wire is bent in a spiral shape and the axis is in a vertical state, and a pressure portion is provided at the upper end portion of the pile body. It is a driven rotary spiral pile in which the pile body is rotationally embedded in the soil by pressing the pressure portion downward, and the diameter of the metal wire is set to 3.4 mm. The characteristic is that the spiral diameter of the pile body is set to 13 mm, the twist pitch length of the spiral is set to 60 mm, and the twist angle of the pile body with respect to the horizontal plane perpendicular to the axis is set to 65 degrees. It is something to do.

A fourth aspect of the driven rotary spiral pile according to the present invention is provided with a pile body in which a metal wire is bent in a spiral shape and the axis is in a vertical state, and a pressure portion is provided at the upper end portion of the pile body. It is a driven rotary spiral pile in which the pile body is rotationally embedded in the soil by pressing the pressure portion downward, and the diameter of the metal wire is set to 3.4 mm. The spiral diameter of the pile body is set to 9 mm, the twist pitch length of the spiral is set to 50 mm, and the twist angle of the pile body with respect to the horizontal plane perpendicular to the axis is set to 71.5 degrees. It is a feature.

A fifth aspect of the driven rotary spiral pile according to the present invention is, in any one of the first to fourth aspects, the pressing portion is configured by a portion on the upper end side of the metal wire rod. It is characterized by being present.

A sixth aspect of the driving rotary spiral pile according to the present invention is, in any one of the first to fourth aspects, in the pressing portion, the upper end side portion of the metal wire rod is spiral in the horizontal plane. It is configured as a spiral plate portion that is bent into a spiral plate portion, and the inner end of the spiral of the spiral plate portion is connected to the upper end of the pile body, and the outer end of the spiral of the spiral plate portion is formed. It is characterized in that it is in contact with or in close proximity to the outer portion of the spiral portion located inside the spiral portion.

A seventh aspect of the driven rotary spiral pile according to the present invention is the driven rotary pile according to any one of the first to fourth aspects, wherein the net is fixed to the ground. The pressing portion is configured as a spiral plate portion in which the upper end side portion of the metal wire rod is bent in a spiral shape in the horizontal plane, and the inner end of the spiral of the spiral plate portion is the pile body. The edge portion of the net can be introduced into the groove portion of the spiral portion between the outer end of the spiral portion of the spiral plate portion and the outer portion of the spiral portion located inside the spiral plate portion, which is connected to the upper end. It is characterized in that an introduction gap is provided.

An eighth aspect of the driven rotary spiral pile according to the present invention is characterized in that, in any one of the first to seventh aspects, the lower end portion of the pile body is tapered. be.

A ninth aspect of the driven rotary spiral pile according to the present invention is, in any one of the first to eighth aspects, a sheet for pressing and fixing a sheet-like object to the ground at the upper end of the pile body. It is characterized in that a shape holding portion is provided.

In the tenth aspect of the driven rotary spiral pile according to the present invention, in any one of the first to eighth aspects, a mounting portion for mounting another object is provided on the upper end portion of the pile body. It is characterized by being present.

When according to the present invention, the following excellent effects are obtained.
(1) The driving rotary spiral pile according to the present invention is to be reliably and efficiently buried in the soil while rotating the pile body by simply pressing the pressure portion at the upper end of the pile body with a hammer or the like. It is possible to exert the required pull-out resistance in the buried state.

(2) In the driven rotary spiral pile according to the present invention, when a sheet-like object having a surface shape such as a weed-proof sheet is fixed to the ground, the diameter of the metal wire rod constituting the pile body is 2.8 or more. Since it is as small as 5 mm, the fastening can be effectively performed only by making a through hole as small as possible. Further, since the diameter of the metal wire used in this way is small, the circumference of the gap generated between the outer peripheral surface of the pile body and the hole edge portion of the through hole is short, and therefore grass is formed in the gap portion. Is hard to grow, and the weed control effect can be improved. Further, since the diameter of the metal wire is small, the weight of the driven rotary spiral pile can be reduced and the handleability can be improved, and the small diameter of the metal wire can reduce the manufacturing cost. It also becomes.

(3) In particular, when the pressing portion constituting the driving rotary spiral pile is configured as a spiral plate portion provided with the introduction gap, the net is fixed to the ground by the spiral plate portion. Occasionally, it can be expected that the marginal portion of the net will be introduced into the groove portion of the spiral portion through the introduction gap, or when the driving of the driving rotary spiral pile is completed, the operator will perform the peripheral portion. Can also be introduced into the introduction gap. Then, by introducing the peripheral portion into the introduction gap in this way, a frictional action between the peripheral portion and the spiral portion of the spiral plate portion and a catching action of the spiral portion on the intersecting portion of the net. It can be expected that the reverse rotation of the pile body is prevented by such means. This makes it possible to prevent the anchored state from becoming unstable.

It is a front view and a plan view explaining the driving rotary spiral pile which concerns on this invention. It is a front view which shows the other aspect of the lower end part of a pile body. It is explanatory drawing which shows the state which the driving rotary type spiral pile is rotationally buried in the soil by pressing the pressing part. It is sectional drawing which shows the state which the sheet-like object was fixed to the ground by the driving rotary spiral pile which was rotary-buried in the soil. It is a front view and a plan view which show the other aspect of the driving rotary spiral pile. It is a front view and a plan view which show the other aspect of the driving rotary spiral pile. It is a perspective view which shows the state which the net is anchored to the ground by rotating and burying a driving rotary spiral pile in the soil. It is a top view which shows the other aspect of the spiral plate part. It is sectional drawing which shows the state which the sheet-like thing was fixed to the ground by rotationally burying the driving rotary spiral pile which the disk-shaped pressing part is formed by press working. It is explanatory drawing explaining the problem of the conventional spiral pile. It is explanatory drawing explaining the problem of the conventional spiral pile. It is explanatory drawing explaining the problem of the conventional spiral pile.

In FIGS. 1 to 4, the driven rotary spiral pile (hereinafter, also referred to as a spiral pile) 1 according to the present invention can exhibit a required pull-out resistance force in a buried state, and the metal wire 2 is bent and formed in a spiral shape. A pile body 3 having a vertical axis L is provided, and a pressing portion 6 is provided at an upper end portion 5 of the pile body 3, and the pile is formed by pressing the pressing portion 6 downward. The main body 3 is designed to be rotationally buried in the soil.

Hereinafter, this will be described more specifically. As the metal wire 2, it is preferable to use a steel wire having a diameter D1 of 2.8 to 5 mm. If the diameter D1 is smaller than 2.8 mm, the rigidity of the pile body 3 is insufficient, and there is a risk that the pile body 3 will be bent and deformed when the pressure portion 6 is pressed downward with a hammer or the like. be. Alternatively, when the pile body 3 is pressed in this way, the spiral portion 7 constituting the pile body 3 is easily elastically deformed into a compressed state, and therefore, it is difficult to rotate and bury the pile body 3 in the soil. , Or it is not preferable because it causes a situation where rotary burial becomes difficult. On the other hand, if the diameter D1 is larger than 5 mm, the metal wire to be used becomes expensive, which is not preferable because it increases the manufacturing cost of the driven rotary spiral pile 1.

Further, the spiral diameter D2 of the pile body 3 is preferably set to 9 to 15 mm. If the spiral diameter D2 is smaller than 9 mm, the required pull-out resistance cannot be obtained, which is not preferable. On the other hand, when the spiral diameter D2 is larger than 15 mm, when the pressing portion 6 is pressed downward with a hammer or the like, the spiral portion 7 is easily elastically deformed into a compressed state, and the pile body 3 is soiled. It is not preferable because it causes a situation in which it is difficult to rotate and bury it, or a situation in which it becomes difficult to rotate and bury it.

Further, the twist pitch length L2 of the spiral is preferably set to 35 to 65 mm. When the twist pitch length L2 of the spiral is smaller than 35 mm, the spiral portion 7 is easily elastically deformed into a compressed state when the pressing portion 6 is pressed downward with a hammer or the like, and the pile body 3 is easily deformed. It is not preferable because it causes a situation where it is difficult to rotate and bury it in the soil, or it causes a situation where it becomes difficult to rotate and bury it. On the other hand, if the twist pitch length L2 of the spiral is larger than 65 mm, the required pull-out resistance cannot be obtained, which is not preferable.

Further, the twist angle θ1 with respect to the horizontal plane 9 forming a right angle to the axis L of the pile body 3 is preferably set to 50 to 72 degrees. When the twist angle θ1 is smaller than 50 degrees, even if the pressing portion 6 is pressed downward with a hammer or the like, the spiral portion 7 is easily elastically deformed into a compressed state, and the pile body 3 is placed in the soil. It is not preferable because it causes a situation in which it is difficult to rotate and bury it, or a situation in which it becomes difficult to rotate and bury it. On the other hand, if the twist angle θ1 is larger than 72 degrees, the required pull-out resistance force cannot be obtained, which is not preferable.

Next, a specific embodiment of the driven rotary spiral pile 1 according to the present invention will be illustrated. As shown in FIGS. 1 to 3, the first aspect of the driven rotary spiral pile 1 is formed by spirally bending and forming one metal wire (steel wire) 2 having a diameter D1 of 3.4 mm. Further, a pile main body 3 in which the axis L is in a vertical state is provided, and a pressing portion 6 is provided at an upper end portion 5 of the pile main body 3. Then, by pressing the pressing portion 6 downward with a hammer as shown by the arrow P in FIG. 3, the pile main body 2 rotates in the direction indicated by the arrow F1 in FIG. 3 and is indicated by the arrow F2. It will be buried in the soil.

Further, the total length L1 of the pile body 3 is set to 150 to 300 mm, for example, 200 mm, the spiral diameter D2 is set to 13 mm, the twist pitch length L2 of the spiral is set to 40 mm, and the pile body 3 is set. The twist angle θ1 with respect to the horizontal plane 9 forming a right angle to the axis L is set to 54.5 degrees. Further, in the present embodiment, as shown in FIG. 1, the lower end portion 10 of the pile body 3 is provided with a right-angled end face 11 by cutting the metal wire 2 so as to be perpendicular to the extension direction F thereof. Is formed as. As shown in FIG. 2, the lower end portion 10 can also be formed as a tapered portion in which the lower end surface portion 12 exhibits an inclined surface 13. In FIG. 2, the angle θ2 of the inclined surface 13 with respect to the right-angled end surface 11 (FIG. 1) is set to, for example, 45 degrees.

Further, as shown in FIG. 1B, the pressing portion 6 is configured by a portion 2a on the upper end side of the metal wire rod 2. Specifically, the portion 2a on the upper end side of the metal wire 2 is configured as a spiral plate portion 15 formed by being bent in a spiral shape in a horizontal plane. Then, the inner end (center side) 16 of the spiral of the spiral plate portion 15 is attached to the upper end portion 5 of the pile body 3 (in this embodiment, the upper end 5a of the pile body 3 having a spiral shape). The outer end 17 of the spiral of the spiral plate portion 15 is in contact with or in close contact with the outer portion 20 of the spiral portion 19 located inside the spiral plate portion 15. In FIG. 1B, an edge portion 21 of a net, which will be described later, is introduced into the groove portion 22 of the spiral portion 19 between the outer end 17 and the outer portion 20 of the spiral portion 19 located inside the outer end 17. An introduction gap 23 to be obtained is provided. The groove width of the introduction gap 23 is set to about 1 to 4 mm in view of the fact that the width of the edge portion 21 is usually 1 to 3 mm.

As shown in FIG. 5, a specific second aspect of the driven rotary spiral pile 1 is that a metal wire (steel wire) 2 having a diameter D1 of 3.4 mm is spirally bent and formed and the axis L is formed. A pile main body 3 is provided in a vertical state, and a pressing portion 6 is provided at an upper end portion 5 of the pile main body 3 (in this embodiment, the upper end 5a of the pile main body 3 having a spiral shape). Then, in the same manner as described with reference to FIG. 3 regarding the first aspect, the pile body 3 can be rotationally buried in the soil by pressing the pressing portion 6 downward with a hammer or the like. .. Further, the total length L1 of the pile body 3 is set to 150 to 300 mm, for example, 200 mm, the spiral diameter D2 is set to 13 mm, the twist pitch length L2 of the spiral is set to 60 mm, and the pile body 3 is set. The twist angle θ1 with respect to the horizontal plane 9 forming a right angle to the axis L is set to 65 degrees.

Further, the lower end portion 10 of the pile body 3 is formed to include a right-angled end surface 11 as in the first aspect. Also in this aspect, the lower end portion 10 thereof can be formed as a tapered portion whose lower surface portion 12 exhibits an inclined surface 13 in the same manner as described with respect to FIG. 2 with respect to the first aspect. The angle θ2 of the inclined surface 13 with respect to the right-angled end surface 11 (FIG. 1) can be set to, for example, 45 degrees.

Further, as shown in FIG. 5B, the pressing portion 6 is configured as a spiral plate portion 15 similar to the above, which is formed by bending the metal wire 2 in a horizontal plane in a spiral shape. .. The inner end (center side) 16 of the spiral of the spiral plate portion 15 is connected to the upper end portion 5 (upper end 5a in this embodiment) of the pile body 3, and the spiral plate portion 15 is connected. The outer end 17 of the spiral is in contact with or in close proximity to the outer portion 20 of the spiral portion 19 located inside the spiral. In FIG. 5B, an edge portion 21 of a net, which will be described later, is introduced into the groove portion 22 of the spiral portion 19 between the outer end 17 and the outer portion 20 of the spiral portion 19 located inside the outer end 17. An introduction gap 23 to be obtained is provided. The groove width of the introduction gap 23 is set to about 1 to 4 mm as described with respect to the first aspect.

In the third aspect of the driven rotary spiral pile 1, as shown in FIG. 6, a metal wire (steel wire) 2 having a diameter D1 of 3.4 mm is spirally bent and formed, and the axis L is in a vertical state. A pile main body 3 is provided, and a pressing portion 6 is provided at an upper end portion 5 (upper end 5a in this embodiment) of the pile main body 3. Then, in the same manner as described with reference to FIG. 3 regarding the first aspect, the pile body 3 can be rotationally buried in the soil by pressing the pressing portion 6 downward with a hammer or the like. .. The total length L1 of the pile body 3 is set to 150 to 300 mm, for example, 200 mm, the spiral diameter D2 is set to 9 mm, the twist pitch length L2 of the spiral is set to 50 mm, and the axis of the pile body 3 is set. The twist angle θ1 with respect to the horizontal plane 9 forming a right angle to L is set to 71.5 degrees.

Further, the lower end portion 10 of the pile body 3 is formed to include a right-angled end surface 11 as in the first aspect. Also in this aspect, the lower end portion 10 thereof can be formed as a tapered portion whose lower surface portion 12 exhibits an inclined surface 13 in the same manner as described with respect to FIG. 2 with respect to the first aspect. The angle θ2 of the inclined surface 13 with respect to the right-angled end surface 11 can be set to, for example, 45 degrees.

Further, as shown in FIG. 6B, the pressing portion 6 is a spiral plate portion 15 formed by bending the metal wire rod (steel wire) 2 in a spiral shape in a horizontal plane in the same manner as described above. It is configured as. The inner end (center side) 16 of the spiral of the spiral plate portion 15 is continuously provided with the upper end portion 5 of the pile body 3 (in this embodiment, the upper end 5a of the pile body 3 having a spiral shape). At the same time, the outer end 17 of the spiral of the spiral plate portion 15 is in contact with or in close contact with the outer portion 20 of the spiral portion 19 located inside the spiral plate portion 15. In FIG. 1B, an edge portion 21 of a net, which will be described later, is introduced into the groove portion 22 of the spiral portion 19 between the outer end 17 and the outer portion 20 of the spiral portion 19 located inside the outer end 17. An introduction gap 23 to be obtained is provided. The groove width of the introduction gap 23 is set to about 2 to 4 mm as described with reference to FIG. 3 with respect to the first aspect.

In any of the driving rotary spiral piles 1 having the above-exemplified configuration, the spiral pile 1 is simply pressed downward with a hammer or the like at the upper end of the pressing portion 6, for example, as shown in FIGS. 3 to 4. Can be reliably and efficiently buried in the soil while rotating.

As described above, in the present embodiment, the pressing portion 6 constituting each of these driving rotary spiral piles 1 is formed by bending the upper end side portion 2a of the metal wire rod 2 in a spiral shape in a horizontal plane. , It is configured as a spiral plate portion 15 having high strength. Therefore, the pressing portion 6 has a large pressing area, unlike the tapping portion, which is composed of a bent piece formed by bending horizontally at the upper end of the straight portion, for example, disclosed in Patent Document 3. The inner end (center side of the spiral) 16 of the spiral of the spiral plate portion 15 is connected to the upper end portion 5 (upper end 5a in this embodiment) of the pile body 3 in which the axis L is vertical. ing. Therefore, the pressure applied to the pressing portion 6 when the pile main body 3 is rotationally buried in the soil is such that the upper surface portion 25 of the spiral plate portion 15 has a large area, and therefore the center of the upper surface portion 25. It can be done accurately by aiming at the side 16 or the peripheral portion thereof. Therefore, the striking pressure can be transmitted in the vertical direction along the axis L, and therefore, the rotational burial of the pile body 3 in the soil can be performed reliably and efficiently.

By forming the lower end portion 10 of the pile body 3 in a tapered shape, for example, the lower end portion 10 may be formed in a tapered conical shape, or the lower surface portion 12 of the lower end portion 10 may be formed as shown in FIG. By forming the tapered portion so as to exhibit the inclined surface 13, when the pressing portion 6 (the upper surface portion 25 of the spiral plate portion 15) is pressed with a hammer or the like, the lower end portion 10 is embedded in the soil. It will be easier. Therefore, the rotary burial of the pile body 3 in the soil can be facilitated. The driven rotary spiral pile 1 is a sheet-like object as the lower surface portion 26 of the spiral plate portion 15 when the pile main body 3 is completely embedded in the soil as shown in FIG. The pressing portion 27 presses the sheet-like object 30 against the ground 29, and the spiral pile 1 exerts a required pull-out resistance force in the buried state. As a result, the sheet-like object 23 is fixed to the ground 29 in a stable state. The sheet-like material 30 includes a weed-proof sheet, a disaster-prevention sheet, a light-shielding sheet, an agricultural sheet such as a mulch, a greening sheet, a vegetation mat for cultivating plants, a beast-proof net, and a wind-proof net. Such as a sheet-like material can be exemplified.

However, when the weed-proof sheet 30a (a type of the sheet-like material 30) laid on the ground 29 is fixed to the ground 29 by using the driving rotary spiral pile 1, a through hole drilled in the weed-proof sheet 30a. 31 has a small diameter of 2.8 mm` 5 mm. Therefore, unlike the case where a large through hole 31 having a diameter of 10 mm is opened as in the case of Patent Document 3, between the outer peripheral surface 32 of the pile body 3 and the hole edge portion 33 of the through hole 31. The circumference of the resulting gap 35 is short. Therefore, it is difficult for grass to grow in the gap 35. Further, since the holes formed in the weed-proof sheet 30a are small, the strength of the weed-proof sheet is not easily impaired. In addition, since the driven rotary spiral pile 1 is lightweight, it is easy to handle.

In particular, when the driving rotary spiral pile 1 is used to fix the lower end portion 36 of the net, for example, the beast-proof net 30b (a type of the sheet-like object 30) attached to the support column to the ground 29. , Will have the following special effects. FIG. 7 shows a state in which the lower end portion 36 that covers the ground 29 is fixed to the ground 29 by using the driving rotary spiral pile 1. In this fixed state, when a lifting force acts on the lower end portion due to the action of an external force due to the contact of an animal with the animal protection net 30b or the influence of wind, and a pulling force acts on the spiral pile 1 in the buried state. , The spiral pile 1 tries to rotate in the reverse direction in the direction in which it comes out of the soil.

At this time, as described above, in the present embodiment, since the introduction gap 23 is provided on the outer end 17 side of the spiral plate portion 15, the lower end portion 36 is formed during this reverse rotation. It is expected that the edge portion 21 of the net (the size of the mesh of the net is 20 to 30 mm) is introduced into the introduction gap 23. Then, when the edge portion 21 is introduced into the groove portion 23 of the spiral portion 19 through the introduction gap 23, a frictional action between the edge portion 21 and the spiral portion 19 of the spiral plate portion 15 or the like. It can be expected that the pile body 3 is less likely to rotate in the reverse direction due to the hooking action of the spiral portion 19 on the intersecting portion 39 of the net. As a result, it is possible to effectively prevent the anchored state from becoming unstable. In this case, it is also possible for the operator to introduce the edge portion 21 into the introduction gap 23 when the driving of the driving rotary spiral pile 1 is completed.

It is needless to say that the present invention is not limited to the one shown in the above embodiment, and various design changes can be made within the description of "Claims". An example of this is as follows.

(1) The driving rotary spiral pile 1 according to the present invention is specified as having the axis L of the pile body 3 in a vertical state, but the driving of the driving rotary spiral pile 1 is not necessarily the axis L. Is not always performed in a vertical state, and the driving may be performed in an inclined state or a horizontal state of the axis L with respect to a slope or the like, for example.

(2) When the pressing portion 6 is configured by the spiral plate portion 15, the form of the spiral plate portion 15 is that the spiral plate portion 15 functions as the pressing portion 6. It suffices as long as it is exhibited, and its form is not specified. FIG. 8 shows an example in which the outer end 17 of the spiral of the spiral plate portion 15 is brought into contact with the outer portion 20 of the spiral portion 19 located inside the spiral plate portion 15.

(3) FIG. 9 shows a disk shape or the like on the upper end portion 5 of the pile body 3 (in this embodiment, the upper end 5b of the vertical straight line portion 40 projecting upward at the upper end 5a of the pile body 3). It shows an example of the case where the pressing part 6 (which has a disk shape in FIG. 9) is formed by press working, and in this embodiment, the vertical straight line part 40 is the sheet-like object. The 30 is inserted into the insertion hole 42 provided in the central portion of the pressing plate 41 that presses the 30 against the ground 29. Then, in a state where the pile main body 3 is rotationally embedded in the soil by pressing the pressing portion 6 downward, the disc-shaped pressing portion 6 presses the pressing portion 6 through the holding plate 41 to form the sheet-like material. A state in which 30 is pressed against the ground 29 can be obtained.

Further, as another embodiment in which the pressing portion 6 is formed by a portion on the upper end side of the metal wire rod, for example, the upper end portion 5 of the pile body 3 (in this embodiment, the pile exhibiting a spiral shape). Examples thereof include a bent piece bent in a horizontal straight line at the upper end 5a) of the main body 3, and a horizontal straight line portion formed by being bent horizontally toward the upper end 5a at the tip of an arc portion centered on the upper end 5a. .. Alternatively, the pressing portion 6 may be provided by fixing a pressing member formed separately to the upper end of the pile body 3 by welding or the like.

(4) A mounting portion for mounting another object by binding or hooking may be provided on the upper end portion of the pile body 3. The mounting portion can be configured as, for example, a part of the pressing portion, a portion between the upper end portion of the pile body and the pressing portion, or the like. Such a mounting portion can be used, for example, to stabilize the mounting state of a vinyl sheet or a tent curtain when constructing a vinyl house or a tent. Specifically, the mounting portion is configured as a connecting portion for connecting the end portions of the other object such as a string-like object hung on the upper surface of the vinyl sheet or attached to the edge of the tent curtain. can. Further, when the mounting portion is configured by using a bamboo blind to cover the window portion of a house or the like, the mounting portion is formed by connecting the end portion of the other object as a string-like object connected to the left and right end portions of the lower end portion of the blind. It can be configured as a connecting portion to be connected.

(5) When a steel wire is used as the metal wire rod 2, the formed pile body 3 may be quenched by post-processing in order to improve the strength of the pile body 3.

(6) The total length of the pile body 3, the spiral diameter of the pile body 3, the twist pitch length of the spiral, and the twist angle are taken into consideration the pull-out resistance required by the application of the driving rotary spiral pile and the like. It is set as required.

1 Drive-in rotary spiral pile 2 Metal wire 3 Pile body 5 Upper end part 6 Pressure part 9 Horizontal plane 10 Lower end part 15 Swirl plate part 16 Inner end of swirl 17 Outer end of swirl 19 Swirl part 21 Margin part 23 Introductory gap 27 Sheet-like object retainer 30 Sheet-like object 31 Through hole

Claims (10)

A pile body in which a metal wire is bent in a spiral shape and whose axis is vertical is provided, and a pressing portion is provided at the upper end portion of the pile body, and the pressing portion is pressed downward. This is a driven rotary spiral pile in which the pile body is rotationally buried in the soil.
The diameter of the metal wire is set to 2.8 to 5 mm, the spiral diameter of the pile body is set to 9 to 15 mm, the twist pitch length of the spiral is set to 35 to 65 mm, and the axis of the pile body is set to 35 to 65 mm. A driven rotary spiral pile characterized in that the twist angle with respect to a horizontal plane forming a right angle is set to 50 to 72 degrees. A pile body in which a metal wire is bent in a spiral shape and whose axis is vertical is provided, and a pressing portion is provided at the upper end portion of the pile body, and the pressing portion is pressed downward. This is a driven rotary spiral pile in which the pile body is rotationally buried in the soil.
The diameter of the metal wire is set to 3.4 mm, the spiral diameter of the pile body is set to 13 mm, the twist pitch length of the spiral is set to 40 mm, and the twist of the pile body with respect to the horizontal plane perpendicular to the axis. A driving rotary spiral pile characterized in that the angle is set to 54.5 degrees. A pile body in which a metal wire is bent in a spiral shape and whose axis is vertical is provided, and a pressing portion is provided at the upper end portion of the pile body, and the pressing portion is pressed downward. This is a driven rotary spiral pile in which the pile body is rotationally buried in the soil.
The diameter of the metal wire is set to 3.4 mm, the spiral diameter of the pile body is set to 13 mm, the twist pitch length of the spiral is set to 60 mm, and the twist of the pile body with respect to the horizontal plane perpendicular to the axis. A driving rotary spiral pile characterized in that the angle is set to 65 degrees. A pile body in which a metal wire is bent in a spiral shape and whose axis is vertical is provided, and a pressing portion is provided at the upper end portion of the pile body, and the pressing portion is pressed downward. This is a driven rotary spiral pile in which the pile body is rotationally buried in the soil.
The diameter of the metal wire is set to 3.4 mm, the spiral diameter of the pile body is set to 9 mm, the twist pitch length of the spiral is set to 50 mm, and the twist of the pile body with respect to the horizontal plane perpendicular to the axis. A driving rotary spiral pile characterized in that the angle is set to 71.5 degrees. The driving rotary spiral pile according to any one of claims 1 to 4, wherein the pressing portion is formed by a portion on the upper end side of the metal wire rod. The pressing portion is configured as a spiral plate portion in which a portion on the upper end side of the metal wire rod is bent in a spiral shape in the horizontal plane, and the inner end of the spiral of the spiral plate portion is the pile main body. The outer end of the spiral of the spiral plate portion is in contact with or in close proximity to the outer portion of the spiral portion located inside the spiral plate portion. Driven rotary spiral pile described in any. The driven rotary spiral pile according to any one of claims 1 to 4, which is used for fixing the net to the ground, and the pressure-applying portion has a portion on the upper end side of the metal wire rod in the horizontal plane. It is configured as a spiral plate portion that is bent in a spiral shape, and the inner end of the spiral of the spiral plate portion is connected to the upper end of the pile body and is outside the spiral of the spiral plate portion. A driving rotary spiral pile characterized in that an introduction gap is provided between the end and the outer portion of the spiral portion located inside the end so that the edge portion of the net can be introduced into the groove portion of the spiral portion. .. The driven rotary spiral pile according to any one of claims 1 to 7, wherein the lower end portion of the pile body is tapered. The driving rotary spiral according to any one of claims 1 to 8, wherein a sheet-shaped object holding portion for pressing and fixing the sheet-shaped object to the ground is provided at the upper end of the pile body. Pile. The driven rotary spiral pile according to any one of claims 1 to 8, wherein a mounting portion for mounting another object is provided at the upper end portion of the pile body.

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