JP2020183630A - Rotary pile - Google Patents

Abstract

To provide a rotary pile which is difficult to rotate in a reverse direction when a pulling-out force is applied to a pile.SOLUTION: A spiral protrusion 9 is provided so as to protrude in a twist state on a peripheral face portion 7 of a rod-like pile main body 6 in a rotary pile, which can be buried in soil by striking a pile upper end 33 to rotate. In order to prevent a reverse rotation of the pile main body 6 buried in soil, recessed and protruding portions 16 comprising protruding portions 13 engaging with soil are formed on a spiral protrusion sloped face 12 as a sloped upper face 10 of the spiral protrusion 9. The recessed and protruding portion 16 is formed in a state where the protruding portions 13 which have different protruding height from the spiral protrusion sloped face 12 and which engages with soil are provided in dispersion state on the spiral protrusion sloped face 12. Between the protruding portions, a gap 60 into which soil gets is formed. On a sloped lower face 11 of the spiral protrusion 9, recessed portions 15 into which soil gets are formed in a dispersion state.SELECTED DRAWING: Figure 11

Description

INDUSTRIAL APPLICABILITY The present invention is a rotary pile used for holding various sheet materials such as weed-proof sheets, light-shielding sheets, and mulch on the ground to fix them, and as piles such as tent pegs that exhibit required pull-out resistance. It is about.

Patented as an example of a rotary pile used to hold various sheet materials such as weed-proof sheets, light-shielding sheets, and mulch to the ground to fix them, and as piles that exhibit the required pull-out resistance such as tent pegs. Those disclosed in Document 1 and Patent Document 2 have been proposed.

An example of the rotary pile according to Patent Document 1 is applied as a sheet material holding pile that holds the sheet against the ground and is applied to the peripheral surface of a rod-shaped pile main body connected to the center of the lower surface of the holding plate. , A pair of spiral ridges are projected in a facing state and in a twisted state in the same direction, and the upper and lower surfaces of the spiral ridges are formed in a smooth surface shape. The lower end portion of the pile body has a tapered detail that tapers toward the lower end, and the upper end of the pile is pressed with a hammer so that the pile body can be embedded in the soil while rotating. Was there. Eventually, the lower surface of the presser plate abuts on the upper surface of the sheet material, whereby the sheet material is anchored to the ground.

Further, in the rotary pile according to Patent Document 2, the support pile is projected downward at the center of the lower surface of the holding plate that holds the sheet-like object, and the spiral ridge is formed on the outer peripheral surface of the support pile. It was provided around the axis, and the upper and lower surfaces of the spiral ridge were formed in a smooth surface shape. A driver engaging hole is provided in the central portion of the upper surface of the holding plate, the tip engaging portion of the driver is inserted into the driver engaging hole, and the holding pile is screwed into the holding pile by the driver. It was configured so that it could be rotated and screwed in the same way as. Eventually, the lower surface of the pressing plate abuts on the surface of the sheet material, whereby the sheet material 3 is anchored to the ground 2.

However, in both the piles according to Patent Document 1 and Patent Document 2, since the upper and lower surfaces of the spiral ridge are formed in a smooth surface shape, the frictional force between the upper and lower surfaces and the soil in contact with the upper and lower surfaces is small. Therefore, when a pulling force acts on the pile, the pile tends to rotate in the reverse direction and easily come off.

JP-A-2018-19 Japanese Unexamined Patent Publication No. 2013-13410

The present invention has been developed in view of the conventional problems of the rotary pile configured to be embedded in the soil while rotating, and the pile reverses when a pulling force acts on the pile. The object is to provide a rotary pile that is difficult to rotate.

In order to solve the above problems, the present invention employs the following means.
That is, the first aspect of the rotary pile according to the present invention is a rotary pile in which a spiral ridge is projected in a twisted state on the peripheral surface of a rod-shaped pile body and is embedded in the soil while rotating. In order to prevent the reverse rotation of the pile body embedded in the soil, a convex portion and / or a convex portion caught in the soil are formed on the inclined upper surface and / or the inclined lower surface of the spiral ridge. / Or, it is characterized in that an uneven portion formed of a concave portion into which soil enters is formed.

In the second aspect of the rotary pile according to the present invention, in the first aspect, the uneven portion is such that the convex portion caught in the soil is dispersed on the inclined upper surface and / or the spiral ridge inclined surface as the inclined lower surface. It is formed by being provided in a state, and is characterized in that a gap through which soil enters is formed between the convex portions.

In the third aspect of the rotary pile according to the present invention, in the first aspect, the concave-convex portion is in a state in which the concave portion into which soil enters is dispersed in the spiral ridge inclined surface as the inclined upper surface and / or the inclined lower surface. It is characterized in that it is provided and formed in.

A fourth aspect of the rotary pile according to the present invention is a rotary pile in which a spiral ridge is projected in a twisted state on the peripheral surface of a rod-shaped pile body and is embedded in the soil while rotating. In order to prevent the reverse rotation of the pile body that is embedded in the soil, the spiral ridge is composed of a convex portion that is caught in the soil on the inclined upper surface and / or the inclined lower surface of the spiral ridge. The uneven portion is formed, and the uneven portion is formed by providing the convex portion having a different protrusion height from the spiral ridge inclined surface in a dispersed state on the spiral ridge inclined surface. It is characterized in that a gap through which soil enters is formed between the convex portions.

A fifth aspect of the rotary pile according to the present invention is a rotary pile in which a spiral ridge is projected in a twisted state on the peripheral surface of a rod-shaped pile body and is embedded in the soil while rotating. Therefore, in order to prevent the reverse rotation of the pile body embedded in the soil, an uneven portion formed of a convex portion caught in the soil is formed on the inclined surface of the spiral ridge as the inclined upper surface of the spiral ridge. The uneven portion is formed on the spiral ridge inclined surface by providing the convex portion having a different protrusion height from the spiral ridge inclined surface in a dispersed state, and between the convex portions. A void through which soil enters is formed, and the inclined lower surface of the spiral ridge is formed on a smooth surface.

A sixth aspect of the rotary pile according to the present invention is, in the fourth aspect, a first convex portion region in which the convex portions having a relatively large protrusion height gather on the spiral ridge inclined surface. The second convex region where the convex portions having a relatively small protruding height are gathered is provided alternately when viewed in the vertical extension direction of the spiral ridge.

A seventh aspect of the rotary pile according to the present invention is, in any one of the first to sixth aspects, the rotary pile is rotated into the soil by pressing the upper end of the pile of the pile body. It is characterized by being configured to be embedded.

In the eighth aspect of the rotary pile according to the present invention, in any one of the first to sixth aspects, the rotary pile is rotated into the soil by pressing the upper end of the pile of the pile body. The pile to be embedded, and the spiral ridge inclined surface existing at the lower end side portion of the pile body is provided with a convex portion having a protrusion amount of 0.1 to 0.5 mm, or the convex portion. Instead of providing a portion, it is characterized in that a recess for soil to enter is provided.

A ninth aspect of the rotary pile according to the present invention is, in any one of the first to sixth aspects, the rotary pile is rotated into the soil by pressing the upper end of the pile of the pile body. The pile to be embedded is characterized in that the pile body is made of metal and a resin spiral ridge is projected on the peripheral surface of the pile body in a twisted state.

A tenth aspect of the rotary pile according to the present invention is that, in the ninth aspect, the pile body is a deformed reinforcing bar, and the protrusion of the deformed reinforcing bar bites into the resin spiral ridge. It is a feature.

The eleventh aspect of the rotary pile according to the present invention is the amount of protrusion of the convex portion from the spiral ridge inclined surface in the first, second, fourth, fifth, sixth or seventh aspect. Is 0.1 to 5 mm.

In the rotary pile according to the present invention, a spiral ridge is projected in a twisted state on the peripheral surface of a rod-shaped pile body, and a convex portion and / or a convex portion caught on soil are projected on the inclined upper surface and / or the inclined lower surface of the spiral ridge. / Or an uneven portion formed of a recess into which soil enters is formed. Therefore, even when a pulling force acts on the pile due to the frictional force generated when the convex portion is caught in the soil or the frictional force generated between the soil solidified by entering the concave portion and the surrounding soil. Is hard to rotate in the reverse direction. Therefore, according to the present invention, it is possible to provide a rotary pile that is hard to rotate in the reverse direction and is hard to come off.

It is a front view which shows the pile which concerns on this invention. It is the usage state explanatory drawing. It is a partial front view and a partial cross-sectional view explaining an example of the arrangement state of the convex part provided on the inclined upper surface. It is explanatory drawing which shows the state which made the pile erection by making the lower end of the pile abut with the required part of the upper surface of the sheet material laid on the ground. It is explanatory drawing which shows the state which the piercing part penetrates a sheet material to form a hole part by hitting the upper end of a pile, and the piercing part pierces the ground. It is explanatory drawing which shows the state which the cutting of the vertical cutting edge part progresses by the subsequent striking pressure, and the whole piercing part is embedded in the soil. It is explanatory drawing which shows the state which the vertical cutting edge portion penetrates a sheet material by the subsequent striking pressure. It is explanatory drawing which shows the state which reached the maximum length by the subsequent striking pressure with the pile body slightly rotated. It is a partial cross-sectional view which shows the state which the gap is formed between the lower surface of the spiral groove formed in the soil by the spiral ridge and the inclined upper surface by hitting the upper end of a pile. It is sectional drawing explaining the work process of pulling out a pile which is in a state of holding down a sheet material and being fixed. It is a front view which shows the rotary pile which the convex part is provided on the inclined upper surface and the concave part is provided on the inclined lower surface. It is a partial front view and a partial sectional view explaining an example of the arrangement state of the convex portion provided on the inclined upper surface and the concave portion provided on an inclined lower surface.

In FIGS. 1 and 2, the rotary pile (hereinafter, also simply referred to as a pile) 1 according to the present invention is a pile for holding and fixing the sheet material 3 laid on the ground 2 with the upper end holding portion 5. A spiral ridge 9 is projected in a twisted state on the peripheral surface portion 7 of a rod-shaped pile body 6 that is long in the vertical direction, and is a pile that is embedded in the soil while rotating. Then, in order to prevent the reverse rotation of the pile body 6 embedded in the soil, the spiral ridge 9 has an inclined upper surface 10 and / or a spiral ridge inclined surface 12 as an inclined lower surface 11 in the soil. An uneven portion 16 composed of a convex portion 13 to be caught and / or a concave portion 15 (FIG. 12) into which soil enters is formed.

In this embodiment, the rotary pile 1 is integrally molded using, for example, a synthetic resin such as polypropylene resin, ABS resin, AES resin, or polycarbonate resin, and is formed on the peripheral surface portion 7 of the pile body 6. A pair of the spiral ridges 9 and 9 are projected in a series in a facing state and in a twisted state in the same direction over the entire length thereof, and the portion on the lower end side of the pile body 6 (attached to FIGS. 1 to 3). The portion (17 below the one-point chain line L1) 17 is said to have a tapered detail 20 that narrows toward the lower end 19 of the pile. Then, in the portion 21 of the pile body 6 above the tip detail 20 (the portion above the one-point chain line L1 attached to FIG. 1), the spiral ridges 9a and 9a (the spiral ridges 9 and 9). The pile main body of the spiral ridges 9a and 9a is set so that the amount of protrusion from the peripheral surface portion 7 of (a part) is set to be equal and the pile 1 can be driven while rotating the pile main body 6. The twist angle θ (FIG. 1) with respect to the plane 22 forming a right angle to the axis L2 of No. 6 is set to 60 degrees.

Then, in the detail 20, as shown in FIGS. 1 and 2, the twist angle θ of the spiral ridges 9b and 9b (a part of the spiral ridges 9 and 9) is directed from the upper end 27 to the lower end 28. Is configured to gradually increase and the amount of protrusion of the spiral ridges 9b and 9b gradually decreases, and the amount of protrusion is set to 0 mm at the lower end 26 of the spiral ridge 9b. Moreover, in the detail 20 thereof, the wall thickness of the spiral ridges 9b and 9b is gradually reduced from the upper end 27 to the lower end 28.

Further, as shown in FIGS. 1 and 2, the spiral ridges 9b and 9b in the opposed state provided in the tip detail 20 form the cutting edge portions 29 and 29, and the lower end side portions of the cutting edge portions 29 and 29. Is configured as vertical cutting edge portions 31, 31 having a twist angle θ of 80 to 90 degrees. Further, the lengths of the vertical cutting edge portions 31, 31 are set to a length equal to or larger than the thickness of the sheet material 3. Further, in the present embodiment, the cutting edge portions 29, 29 have a sharp tip portion when viewed in the protruding direction.

In the pile 1, the pair of spiral ridges 9, 9 are thus projected from the peripheral surface portion 7 of the pile body 6 in a state of facing each other and in a twisted state in the same direction, and the spiral ridges 9, 9. Since the tip portion of No. 9 is formed in a sharp portion when viewed in the protruding direction over the entire length, when the upper end 33 of the pile is pressed with a hammer, the pair of spiral ridges 9 and 9 become sharp portions. While the configured tip portion cuts the soil, it is easily embedded in the soil while rotating along the twisting inclination of the ridgeline of the spiral ridges 9 and 9.

Hereinafter, the configuration of the pile 1 will be described more specifically. In this embodiment, the sheet material 3 is configured as a weed-proof sheet 3a having a thickness of, for example, about 4 mm, and the pile 1 presses the weed-proof sheet 3a against the ground 2 to fix it. Is.

In this embodiment, the pile body 6 is formed in the shape of a rod having a circular cross section having a diameter of about 11 mm, and as shown in FIG. 1, the upper end 35 thereof has a disk shape and the sheet is formed. It is connected to the lower surface 37 of the pressing portion 5 as the pressing plate 36 that presses the material 3. In this embodiment, it is connected to the center of the lower surface.

As shown in FIG. 1, the holding plate 36 is provided with a first raised portion 40 having a diameter smaller than that of the disc-shaped substrate portion 39 concentrically, and is provided on the first raised portion 40. Second ridges 41 having a smaller diameter than the above are provided concentrically. The diameter of the holding plate 36 (diameter of the disc-shaped substrate portion 39) is larger than the maximum distance D (shown in FIG. 1, about 30 mm) between the facing edges of the pair of spiral ridges 9 and 9. It is set to a large value, and in this embodiment, it is set to 60 mm. The upper surface 42 of the second raised portion 41 becomes the upper end 33 of the pile to be pressed by a hammer.

An insertion hole (for example, 6 mm diameter) 46 for inserting a shaft body 45 (FIG. 10) constituting a handle 43 for reversely rotating the pile 1 when the pile 1 is pulled out is inserted into the upper surface portion of the holding plate 36. Is provided. As shown in FIG. 10, the insertion hole 46 is provided so as to penetrate the first and second raised portions 40 and 41 in the radial direction thereof in this embodiment.

The total length of the pile body 6 is set to, for example, 250 mm, and the lower end portion of the tip detail 20 is a sharp shaft portion 47 that narrows toward the lower end as shown in FIGS.

The outer periphery of the pair of spiral ridges 9 and 9 projecting from the peripheral surface portion 7 of the pile body 6 is on the same circumferential surface concentric with the axis L2 of the pile body 6.

Here, the twist angle θ will be described. The twist angle θ of the spiral ridges 9b and 9b provided in the tip 20 and forming the cutting edge portions 29 and 29 is set to 75 to 90 degrees to form the vertical cutting edge portions 31 and 31. The twist angle θ of the spiral ridges 9b1 and 9b1 is set to 80 to 90 degrees, and the twist angle θ of the spiral ridges 9a and 9a provided in the portion above the tip 20 is set to 60. The setting of ~ 80 degrees is set so that the cutting edge portion 29 can penetrate the sheet material 3 to form a cut by driving the pile 1, and when the pile body 6 rotates with the subsequent driving, the cutting edge portion 29 penetrates the sheet material 3 and forms a cut. This is to prevent the sheet material 3 from wrapping around the pile body 6.

Further, the length of the tip detail 20 is set to about 50 mm, and the twist angle θ of the spiral ridges 9 and 9 in the facing state provided in the tip detail 20 is set at the upper end 27 in this embodiment. It is set to 77 degrees. The lower end side portion of the cutting edge portion 29 is configured as the vertical cutting edge portions 31 and 31 that exhibit a substantially vertical state substantially parallel to the axis L2. In particular, in this embodiment, the lower ends 26, 26 of the spiral ridges 9b, 9b (lower ends of the vertical cutting edge portions 31, 31) in the tip detail 20 are about 15 mm above the lower end 28 of the tip detail 20. The portion below the lower ends 26, 26 of the spiral ridges 9b, 9b in the facing state provided in the tip detail 20 is a piercing portion 30. The length of the piercing portion 30 is set to be larger than the thickness of the sheet material 3 (about 4 mm). In this embodiment, the length is set to about 15 mm.

As shown in FIGS. 1 and 2, the vertical cutting edge portions 31 and 31 are for making a cut in the sheet material 3, and the length of the vertical cutting edge portions 31 and 31 is on the ground 2. Considering that the normal thickness of the sheet material 3 to be laid is 5 mm or less, in this embodiment, it is set to 8 mm to improve the versatility of the pile 1. As shown in FIGS. 1 and 2, the amount of protrusion of the vertical cutting edge portions 31 and 31 from the peripheral surface portion 7 decreases from the upper end 50 of the vertical cutting edge portions 31 and 31 toward the lower end 51 thereof. It is formed, and is set to about 1.5 mm at the upper end 50 and 0 mm at the lower end 51.

As shown in FIG. 1, in this embodiment, the uneven portion 16 is provided only on the inclined upper surface 10 of the spiral ridge inclined surface 12, and is not provided on the inclined lower surface 11. The inclined lower surface 11 is formed in a smooth surface shape in this embodiment. Then, in the inclined upper surface 10, as shown in FIG. 3A, the uneven portion 16 is formed by providing the convex portions 13 having different protrusion heights from the inclined upper surface 10 in a dispersed state. The first convex region 55 where the convex portions 13 having a relatively large protrusion height are gathered, and the convex portion 13 having a relatively small protrusion height (the convex portion 13 having a relatively small protrusion height has a small protrusion height). The second convex region 56 (including the convex portion 13) is provided alternately when viewed in the extension direction of the spiral ridge 9.

In the rotary pile 1 in the front view shown in FIG. 1, as shown in FIGS. 3A and 3B, the wide vertical central portion 57 of the spiral ridge inclined surface 12 However, the first convex region 55 where the convex portions 13 having a relatively large protrusion height are gathered is set to, for example, about 1 mm to 0.8 mm. The protruding height of the convex portion 13 gradually decreases from the central portion 57 in the upward or downward direction. To give an example of the protruding height, in the first convex region 55, the protruding height of the convex portion 13 is set to be relatively large, 1 mm, 0.9 mm, and 0.8 mm. Further, in the second convex portion region 56, the protruding height of the convex portion 13 is set to be relatively small, 0.7 mm, 0.5 mm, 0.4 mm, and 0.2 mm.

Then, in the first convex region 55, relatively large voids 60 having a deeper depth are formed in a dispersed state according to the magnitude of the protruding height of the convex portion 13, and the second convex region 55 is formed. In the convex region 56 of the above, small voids 60 having a shallower depth are formed in a dispersed state.

FIGS. 4 to 8 and 2 show a work process of driving a pile 1 into a sheet material 3 as a weed-proof sheet 3a laid on the ground 2 and pressing the pile 1 against the ground 2 to fix the sheet material 3 and its operation. is there. First, as shown in FIG. 4, the pile 1 is placed in an upright state in which the lower end 19 of the pile is in contact with a required portion of the upper surface 61 of the weed control sheet 3a. In this state, the upper end 33 of the pile is pressed with a hammer. As a result, as shown in FIG. 5, the piercing portion 30 penetrates the weed-proof sheet 3a to form a hole portion 62 and is pierced into the ground 2. In this state, the lower end portion of the pile 1 is supported by the ground, and the standing state is more stably maintained.

As shown in FIG. 6, the vertical cutting edge portions 31 and 31 forming the lower end side portions of the cutting edge portions 29 and 29 in the facing state are opposed to the edge portion 62a of the hole portion 62 by the subsequent striking pressure. The edge of the hole 62 is cut so as to make an outward cut on the side. This cutting is easily performed because the tip portions of the vertical cutting edge portions 31, 31 are formed in sharp portions. Hereinafter, the cuts 63 and 63 formed by the vertical cutting edge portions 31 and 31 are also referred to as initial cuts 63a and 63a. In this embodiment, the lengths of the vertical cutting edge portions 31 and 31 in the axis L2 direction are set to about 5 mm, and the thickness of the sheet material 3 is set to about 4 mm. The vertical cutting edge portions 31, 31 can form the initial cuts 63a, 63a over the entire length of the thickness of the sheet material 3.

By the subsequent striking pressure, the opposed state cutting edge portions 29, 29, which are connected in series with the facing state vertical cutting edge portions 31, 31, further extend the initial cuts 63a, 63a. , The piercing portion 30 is completely embedded in the soil. By the subsequent striking pressure, as shown in FIG. 7, the initial cuts 63a and 63a in the opposite state are formed over the entire thickness of the sheet material 3.

As shown in FIG. 8, when the upper end 27 of the tip detail 20 reaches the lower surface 63 of the sheet material 3 due to the subsequent striking pressure, the cuts 63 and 63 have the maximum length. These cuts 63 and 63 are also referred to as maximum cuts 63b and 63b. The lengths of the maximum cuts 63b and 63b are equal to the maximum protrusion amount of the cutting edge portions 29 and 29, and are about 8 mm in this embodiment. During this time, since the spiral ridges 9b and 9b in the opposite state provided in the tip detail 20 have the twist angle, the pile body 6 rotates slightly when the tip detail 20 is driven into the ground. .. Alternatively, since the twist angles θ of the spiral ridges 9b and 9b (FIG. 1) in this portion are large, they hardly rotate.

Then, as shown in FIG. 1, in the portion 21 above the tip detail 20, the twist angle of the spiral ridges 9 and 9 in the facing state is set to 60 to 80 degrees, and in the figure, 60 degrees. Therefore, as the pile body 6 is driven in, the pile body 6 is sequentially embedded in the soil while rotating. Therefore, a rotary tool for rotating the pile body 6 is not required. Moreover, it is not necessary to prepare a power supply for the rotary tool. In this embodiment, the pair of spiral ridges 9 and 9 facing each other pierce the peripheral surface portion 7 of the pile body 6 in a twisted state in a series of rotations of the pile body 6 due to the driving. This is easily performed because the spiral ridges 9 and 9 are provided and the tip portions 32 and 32 viewed in the projecting direction thereof are formed in sharp portions over the entire length thereof.

Further, since the amount of protrusion of the spiral ridges 9 and 9 from the peripheral surface portion 7 is constant above the upper end 27 of the tip detail 20, the maximum cut 63b is caused by the driving of the pile body 6. The pile body 6 is buried in the soil while rotating without expanding 63b.

Finally, as shown in FIG. 2, the lower surface 37 of the presser plate 36 comes into contact with the upper surface 61 of the sheet material 3, whereby the presser plate 36 ensures that the sheet material 3 is pressed against the ground 2. The sheet material 3 is obtained and is anchored to the ground 2.

As described above, with the driving of the pile body 6, the pile body 6 is embedded in the soil while rotating without expanding the maximum cuts 63b and 63b. However, due to such embedding, the pile bodies 6 are vertically adjacent to each other. Soil bites between the matching spiral ridge slopes 12 and 12 and the pile body 6.

By the way, as described above, the convex portion 13 caught on the soil is provided in a dispersed state on the inclined upper surface 10 which is the spiral ridge inclined surface 12, and the uneven portion 16 is formed. The convex portions 13 provided in the dispersed state have different protrusion heights from the inclined upper surface 10. Here, the fact that the protrusion heights are different means that the heights of all the convex portions 13 provided in the dispersed state are different, and a plurality of convex portions 13 having the same protrusion height are included. It means that it may be. In FIG. 3, the first convex region 55 where the convex portions 13 having a relatively large protrusion height gather and the second convex region 56 where the convex portions 13 having a relatively small protruding height gather are , The spiral ridges 9 are provided alternately when viewed in the vertical extension direction. Then, the gap 60 into which the soil enters is formed between the convex portions 13 and 13.

Therefore, when a pulling force acts on the rotary pile 1 embedded in the soil and the pile 1 tries to rotate in the reverse direction, the frictional force generated by the convex portion 13 being caught in the soil and the above-mentioned Due to the frictional force generated between the soil that has entered the gap 60 and solidified and the surrounding soil, it is difficult for the pile to rotate in the reverse direction. As a result, when the rotary pile 1 according to the present invention is used, there is an advantage that the pile is unlikely to rotate in the reverse direction even when a pulling force acts on the pile.

In particular, in this embodiment, the rotary pile 1 is configured as a pile that is embedded in the soil while rotating by pressing the pile upper end 33 of the pile body 6. Therefore, when the rotary pile 1 is embedded in the soil while rotating due to the striking pressure, for example, as shown in FIG. 9, the lower surface 64 of the spiral groove formed in the soil by the spiral ridge 9 and A slight gap (for example, a gap of about 1 mm) 65 is formed between the inclined upper surface 10 and the inclined upper surface 10. Although the lower surface 64 is actually an uneven surface, it is shown as a smooth surface in FIG. 9 for convenience of explanation. Therefore, in this embodiment, from the example of the protruding height of the convex portion 13, since the protruding height of the convex portion 13 is 1 mm at the maximum, the pile body 6 is embedded while rotating due to the pressing force. At that time, the convex portion 13 hardly contacts the lower surface 64 of the spiral groove, or even if it contacts, it is in a light contact state. Therefore, the convex portion 13 hardly interferes with the embedding due to the driving rotation of the pile body 6.

As described above, the rotary pile 1 of the driving rotation type skillfully utilizes the phenomenon that the gap 65 is formed at the time of driving, and the friction caused by the convex portion 13 being caught in the soil as described above. While it is possible to prevent the reverse rotation of the pile due to the force, it is possible to prevent the convex portion 13 from hindering the rotational embedding of the pile body 6.

In particular, in this embodiment, since the uneven portion 16 provided on the inclined upper surface 10 is configured as the convex portion 13, when the protruding height of the convex portion 13 is large, the rotary pile 1 is placed in the soil. Immediately after the pile is embedded by rotation, the reverse rotation of the pile due to the pulling force acting on the pile can be prevented by the frictional force caused by the convex portion 13 being caught in the soil. By the way, when the protruding height of the convex portion 13 is small, the frictional force associated with the convex portion 13 being caught in the soil is small.

However, as described above, since the void 60 through which the soil enters is formed between the convex portions having a small protrusion height, in the long-term view, the soil (particle size) that has entered the void 60 and solidified. The frictional force generated between (small soil) and the surrounding soil also has the effect of preventing reverse rotation of the pile. The long-term effect is also obtained by the frictional force generated between the soil (regardless of the size of the soil particle size) solidified by entering the deep void 60 and the surrounding soil.

When replacing the sheet material 3 laid on the ground as described above, or when removing the sheet material such as the blue sheet temporarily laid at a disaster site or the like, the rotary pile 1 is provided. As shown in FIG. 10, the shaft body 45 is inserted into the insertion hole 46, and the rotary pile 1 is rotated in the opposite direction. This rotation operation requires a certain amount of rotational force at first, but after that, the rotary pile 1 can be easily reversely rotated and easily pulled out.

11 to 12 show another embodiment of the rotary pile 1 according to the present invention, and relates to the first embodiment in which the uneven portion 16 formed of the convex portion 13 is provided on the inclined upper surface 10. In the rotary pile 1, the inclined lower surface 11 is provided with an uneven portion 16 formed of a recess 15 into which soil enters. In this embodiment, the uneven portion 16 is formed by providing recesses 15 having different diameters and depths in a dispersed state, as shown in FIG. 12B, for example. In particular, in this embodiment, as shown in FIG. 12, the concave-convex portion 16 has a first concave portion region 66 in which recesses 15 having a relatively large diameter and relatively deep are gathered, and the concave-convex portion 16 has a relatively small diameter and is relatively shallow. The second recessed regions 67 where the recesses 15 gather are alternately provided when viewed in the vertical extension direction of the spiral ridge 9. Here, the recess 15 having a relatively small diameter includes a recess having a small diameter, and the recess 15 having a relatively shallow diameter also includes a recess having a shallow depth.

In the rotary pile 1 in the front view shown in FIG. 11, as shown in FIGS. 12A and 12B, the wide vertical central portion 57 of the inclined lower surface 11 (FIG. 11). The central portion in 12 (A)) is the first recessed region 66, and the portion above and below the central portion 57 is the second recessed region 67. In this embodiment, the diameter of the recess 15 in the first recess region 66 is set to, for example, about 1 mm to 0.8 mm, and the depth thereof is set to about 1 mm to 0.8 mm. The diameter of the recess 15 in the second recess region 67 is set to, for example, about 0.8 mm to 0.2 mm, and the depth thereof is set to, for example, about 0.8 mm to 0.2 mm. The diameter and depth of the recess 15 are gradually reduced from 57 in the upward or downward direction.

In the case of the rotary pile 1 according to the present embodiment, when the rotary pile 1 is embedded in the soil while rotating by pressing the pile upper end 33 (FIG. 1) of the pile main body 6, the recess 15 is used. Does not interfere with the implantation. Then, in a state where the rotary pile 1 is required to be embedded in the soil, in a long-term view, due to the frictional force generated between the soil solidified by entering the recess 15 and the surrounding soil, The effect of preventing the reverse rotation of the pile 1 can be obtained. It should be noted that the large-sized recess 15 can contain both large-diameter soil and small-diameter soil, while the small-sized recess 15 can contain small-diameter soil.

It goes without saying that the present invention is not limited to that 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 rotary pile 1 according to the present invention can be applied to a pressure-rotating rotary pile that can be embedded in the soil while rotating by pressing the pile upper end 33 of the pile body 6, and also has a wood screw. It can also be applied to a rotary pile that can be rotated and screwed in the same way as screwing in.

(2) When the uneven portion 16 is provided on the inclined lower surface 11, the uneven portion 16 is as shown in the second embodiment in order to smoothly embed the rotary pile 1 in the soil while rotating. It is preferable to configure it as a concave portion 15, but the concave-convex portion 16 can also be configured as a convex portion 13 as long as it does not hinder the embedding so much. In this case, since the void 60 through which the soil enters can be formed between the convex portions, the required frictional force will be exhibited in the same manner as described above in the long-term view. In this case, it is preferable to reduce the number of convex portions 13 and increase the number of concave portions 15.

(3) When the concave-convex portion 16 is configured to be composed of the concave portion 15, the concave portion 15 has a diameter of, for example, about 1 mm, taking care not to impair the strength of the spiral ridge 9. It may also be configured as a through hole.

(4) The form of the convex portion 13 constituting the uneven portion 16 and the protruding height thereof, and the form of the concave portion 15 and its diameter and depth thereof are buried in the soil while rotating the rotary pile 1. Various configurations can be made as long as the convex portion 13 does not hinder the embedding and the pile does not easily rotate in the reverse direction when a pulling force acts on the pile. In addition to the above-mentioned ones, the convex portion 13 may be configured to have a shape such as a linear shape, a curved linear shape, or a protruding portion having a recessed central portion. Further, when the uneven portion 16 is configured to be composed of the convex portion 13, the amount of protrusion of the convex portion 13 from the spiral ridge inclined surface 12 is, for example, 0. It can be set to 1 to 5 mm.

(5) The deeper the soil in the soil, the tighter the soil. Therefore, in the rotary pile of the driving rotation type, the lower surface 64 (FIG. 9) of the spiral groove formed in the soil by the spiral ridge 9 at the lower end portion of the pile which is near the completion of driving. The gap 65 (FIG. 9) formed between the inclined upper surface 10 and the inclined upper surface 10 is smaller than when the soil depth is shallow. Therefore, the convex portion 13 hardly contacts the lower surface 64 of the spiral groove even in a state close to the completion of the driving, or the convex portion 13 makes a light contact state even if the contact is made, so that the convex portion 13 drives the pile main body 6. It is better not to interfere with the implantation due to rotation. Therefore, the protruding amount of the convex portion 13 provided on the spiral ridge inclined surface 12 existing at the lower end side portion of the pile main body 6 is preferably as small as 0.1 to 0.5 mm. Alternatively, instead of providing the convex portion 13, it is preferable to provide the concave portion 15 into which soil enters.
(6) The uneven portion 16 includes one composed of only the convex portion 13, one composed of only the concave portion 15, and one composed of a combination thereof.

(7) The rotary pile 1 according to the present invention may be made of metal such as iron as well as made of resin.

(8) The spiral ridge 9 may not be provided over the entire length of the pile body 6 if the object of the present invention can be achieved.

(9) The total length of the pile body 6 can be set to, for example, 150 mm to 1000 mm. In particular, in the case of the long pressure-rotating type pile in which the total length of the pile body 6 is set to 500 mm to 1000 mm, in order to improve the strength of the pile body 6 at the time of pressure, the pile body is used. 6 may be made of metal such as iron. In this case, for example, a spiral ridge 9 made of a polycarbonate resin is projected on the peripheral surface of the pile body 6 in a twisted state. In particular, when the pile body 6 is made of a metal having a protrusion on the surface such as a deformed reinforcing bar, the spiral ridge 9 can be made to bite into the protrusion, so that the spiral ridge 9 can be made to bite into the protrusion. Can be effectively prevented from peeling from the pile body 6. The pile body 6 may be configured to have no such protrusion.

(10) The pile according to the present invention can be used not only for pressing the sheet material against the ground or the like to fix it, but also for preventing the floating of outdoor installation objects such as tents and other various installation objects. You can also.

1 Rotating pile 2 Ground 3 Sheet material 5 Presser part 6 Pile body 7 Peripheral surface 9 Spiral ridge 10 Slope upper surface 11 Slope lower surface 12 Slope ridge slope surface 13 Convex part 15 Recession 16 Concavo-convex part 19 Pile lower part 20 Tip details 29 Blade 33 Pile top 36 Presser plate 60 Void

Claims (11)

A rotary pile in which a spiral ridge is projected in a twisted state on the peripheral surface of a rod-shaped pile body and is embedded in the soil while rotating, and the pile body is embedded in the soil. In order to prevent reverse rotation, the inclined upper surface of the spiral ridge and / or the inclined surface of the spiral ridge as the inclined lower surface is formed with an uneven portion consisting of a convex portion that is caught in the soil and / or a concave portion that the soil enters. A rotary pile that is characterized by that. The concavo-convex portion is formed by providing a convex portion that is caught by the soil in a dispersed state on the spiral ridge inclined surface as the inclined upper surface and / or the inclined lower surface, and a gap through which soil enters is formed between the convex portions. The rotary pile according to claim 1, wherein the rotary pile is formed. The rotary pile according to claim 1, wherein the uneven portion is formed by providing recesses for soil to enter in a dispersed state on the spiral ridge inclined surface as the inclined upper surface and / or the inclined lower surface. .. A rotary pile in which a spiral ridge is projected in a twisted state on the peripheral surface of a rod-shaped pile body and is embedded in the soil while rotating, and the pile body is embedded in the soil. In order to prevent reverse rotation, an uneven portion formed of a convex portion that is caught in the soil is formed on the inclined upper surface and / or the inclined lower surface of the spiral ridge as the inclined lower surface. The convex portions having different protrusion heights from the spiral ridge inclined surface are provided in a dispersed state on the spiral ridge inclined surface, and a gap through which soil enters is formed between the convex portions. A rotary pile that is characterized by that. A spiral ridge is projected on the peripheral surface of a rod-shaped pile body in a twisted state, and is a rotary pile that is embedded in the soil while rotating, and the pile body that is embedded in the soil. In order to prevent reverse rotation, a concavo-convex portion formed of a convex portion that is caught in the soil is formed on the spiral ridge inclined surface as the inclined upper surface of the spiral ridge, and the concavo-convex portion is the spiral ridge inclined surface. The convex portions having different protrusion heights from the inclined surface of the spiral ridge are provided in a dispersed state, and a gap through which soil enters is formed between the convex portions, and the spiral ridge is formed. A rotary helix characterized in that the inclined lower surface of the helix is formed on a smooth surface. On the spiral ridge inclined surface, a first convex region where the convex portions having a relatively large protrusion height gather and a second convex region region where the convex portions having a relatively small protrusion height gather are formed. The rotary pile according to claim 4, wherein the spiral ridges are provided alternately when viewed in the vertical extension direction. The rotary pile according to any one of claims 1 to 6, wherein the rotary pile is a pile that is embedded in the soil while rotating by pressing the upper end of the pile of the pile body. The rotary pile is a pile that is embedded in the soil while rotating by pressing the upper end of the pile of the pile body, and protrudes from the spiral ridge inclined surface existing at the lower end side portion of the pile body. Claims 1 to 6 are characterized in that a convex portion having an amount of 0.1 to 0.5 mm is provided, or instead of providing the convex portion, a concave portion through which soil enters is provided. The rotary pile described in any of. The rotary pile is a pile that is embedded in the soil while rotating by pressing the upper end of the pile of the pile body, the pile body is made of metal, and the peripheral surface of the pile body is made of resin. The rotary pile according to any one of claims 1 to 6, wherein the spiral ridges of the above are projected in a twisted state. The rotary pile according to claim 9, wherein the pile body is a deformed reinforcing bar, and the protruding portion of the deformed reinforcing bar bites into the resin spiral ridge. The rotary pile according to claim 1, 2, 4, 5, 6 or 7, wherein the amount of protrusion of the convex portion from the spiral ridge inclined surface is 0.1 to 5 mm.

Images