JP2021042572A - Ile fall prevention device - Google Patents

Abstract

To provide a low-cost pile fall prevention device that can be easily used.SOLUTION: A pile fall prevention device 10 that prevents piles with one end embedded in the ground from falling comprises: a strut portion 11 having a pile through hole 11c having a substantially cylindrical hole shape through which a pile can penetrate and extending in the longitudinal direction, with one end portion 11a that can be embedded in the ground on one side in the longitudinal direction and the other end portion 11b on the other side in the longitudinal direction; and a plurality of blade portions 12a, 12b and 12c extending radially from the outer peripheral surface of the strut portion. In the pile fall prevention device, an inner wall of the pile through hole 11c is inclined with respect to the central axis of the strut portion so that the inner diameter of the pile through hole 11c increases from at least a predetermined position in the longitudinal direction of the strut portion 11 toward the one end.SELECTED DRAWING: Figure 1

Description

The present invention relates to a pile fall prevention device that makes it difficult for a pile embedded in the ground to fall.

In the fields of agriculture and animal damage control, stakes and stakes are often used, such as agricultural stakes that support fruit trees, greenhouse stakes, electric fence stakes, and beast net support stakes. However, the ground on which such stakes and stanchions are buried may be soft soil, and may collapse due to natural disasters such as rain and wind, and collision of animals such as ingots and deer.

Patent Document 1 describes a fall prevention means for preventing a pile embedded in the ground from falling.

Patent Document 1: Japanese Unexamined Patent Publication No. 2002-180461

However, the one described in Patent Document 1 has a problem that it is necessary to dig a hole in advance and the structure is complicated and the cost is high.

An object of the present invention is to solve the above problems and to realize a low-cost pile fall prevention device that can be easily used.

In order to solve the above problems, the present invention is a pile fall prevention device for preventing a pile whose end is embedded in the ground from falling.
The pile has a substantially cylindrical hole-shaped pile through hole through which the pile can penetrate, extends in the longitudinal direction, and one end that can be embedded in the ground on one side in the longitudinal direction and the other on the other side in the longitudinal direction. With the strut part with the end of
A plurality of blades extending radially from the outer peripheral surface of the support column are provided.
The inner wall of the pile through hole is inclined with respect to the central axis of the support so that the inner diameter of the pile through hole increases from at least a predetermined position in the longitudinal direction of the support toward the one end. It is intended to provide a pile fall prevention device characterized by.

With this configuration, it is possible to realize a low-cost pile fall prevention device that can be easily used. Further, by inclining the inner wall of the pile through hole so that the inner diameter of the pile through hole of the support column increases toward the ground, the soil becomes the pile through hole when the pile fall prevention device is embedded in the ground. It is easy to get inside, and it becomes a dense soil and can hold the pile firmly.

The strut portion has a substantially cylindrical shape and has a substantially cylindrical shape.
The outer wall of the strut portion is inclined with respect to the central axis of the strut portion so that the outer diameter of the strut portion becomes smaller as the outer diameter of the strut portion becomes smaller from a predetermined position in the longitudinal direction of the strut portion toward the one end portion. May be good.

With this configuration, the outer wall of the strut portion is inclined so that the outer diameter of the strut portion becomes smaller toward the ground, so that the pile fall prevention device can be easily embedded in the ground.

The strut portion may be configured so that it can be divided by a dividing surface provided along the longitudinal direction.

With this configuration, even if the upper and lower ends of the pile have a wedge shape or a lid shape to prevent the pile from coming off, the pile fall prevention device can be divided and attached to the pile.

With the pile fall prevention device of the present invention, it is possible to realize a low-cost pile fall prevention device that can be easily used.

It is a perspective view explaining the pile fall prevention device in Example 1 of this invention. It is a figure explaining the state which inserted the pile into the pile fall prevention device in Example 1 of this invention. It is a top view (a) and a front view (b) explaining the pile fall prevention device in Example 1 of this invention. It is a front view (a) and a side view (b) explaining the blade part in Example 1 of this invention. It is sectional drawing explaining the support column part in Example 1 of this invention. It is a figure explaining the use method of the pile fall prevention device in Example 1 of this invention. It is sectional drawing explaining the support column part in Example 2 of this invention. It is a figure explaining the pile in Example 3 of this invention. It is a top view (a) and a front view (b) explaining the pile fall prevention device in Example 3 of this invention. It is a figure explaining after division (a) and before division (b) of the pile fall prevention device in Example 4 of this invention. It is a top view (a) and a front view (b) explaining the pile fall prevention device in Example 5 of this invention.

Example 1 of the present invention will be described with reference to FIGS. 1 to 6. FIG. 1 is a perspective view illustrating a pile fall prevention device according to a first embodiment of the present invention. FIG. 2 is a diagram illustrating a state in which a pile is inserted into the pile fall prevention device according to the first embodiment of the present invention. FIG. 3 is a top view (a) and a front view (b) for explaining the pile fall prevention device according to the first embodiment of the present invention. FIG. 4 is a front view (a) and a side view (b) for explaining the blade portion according to the first embodiment of the present invention. FIG. 5 is a cross-sectional view illustrating a support column portion according to a first embodiment of the present invention. FIG. 6 is a diagram illustrating a method of using the pile fall prevention device according to the first embodiment of the present invention.

The pile fall prevention device 10 according to the first embodiment has a substantially cylindrical hole-shaped pile through hole 11c having an inner diameter through which the pile K can penetrate, extends in the longitudinal direction, and can be embedded in the ground on one side in the longitudinal direction. A strut portion 11 having a substantially cylindrical shape having one end portion 11a and the other end portion 11b on the other side in the longitudinal direction, and three blade portions extending radially from the outer peripheral surface of the strut portion 11. It includes 12a, 12b, and 12c.

With such a configuration of the pile fall prevention device 10, the pile K inserted into the pile through hole 11c is firmly held in the ground even when a natural disaster or an animal collides, and the pile K is firmly held in the ground. It is possible to prevent it from falling over.

As shown in FIG. 2, the pile K is inserted into the pile through hole 11c by the pile fall prevention device 10 buried in the ground below the position indicated by G with respect to the pile K embedded in the ground. As a result, the blades 12a, 12b, and 12c hinder the lateral movement of the pile, and the pile K can be firmly held on the ground, and the pile K collapses due to a natural disaster such as rain or wind or a collision of animals. It can be prevented from slipping out.

(Pile fall prevention device)
The pile fall prevention device 10 according to the first embodiment will be described in detail. The strut portion 11 and the blade portions 12a, 12b, and 12c are all made of synthetic resin and integrally molded. The outer diameter of the outer peripheral surface of the strut portion 11 is about 30 mm, the inner diameter of the pile through hole 11c which is a substantially cylindrical hole is about 20 mm, and the length of the strut portion 11 in the longitudinal direction is about 100 mm. As for the inner diameter, the inner wall of the pile through hole 11c is slightly inclined with respect to the central axis of the support column 11. That is, the inner diameter of the pile through hole 11c increases from the other end 11b toward one end 11a (see FIG. 5). However, the outer diameter of the strut portion 11, the inner diameter of the pile through hole 11c, and the length of the strut portion 11 in the longitudinal direction may be changed depending on the thickness and length of the pile.

As shown in FIG. 3, in the blade portion 12a, one side 12a1 and the other side 12a2 extend radially from the outer peripheral surface of the strut portion 11 by about 80 mm, respectively, and the side 12a3 is orthogonal to the side (post). It is formed in a straight line (parallel to the outer wall of 11). Similarly, the blade portions 12b and the blade portions 12c are also evenly arranged at intervals of 120 ° and extend radially. The other side 12a2 of the blade portion 12a, the other side 12b2 of the blade portion 12b, and the other side 12c2 of the blade portion 12c (not shown in FIG. 3) are from substantially the same positions as the other end portion 11b of the support portion 11. It is stretched horizontally. However, one side 12a1 of the blade portion 12a, one side 12b1 of the blade portion 12b, and one side 12c1 of the blade portion 12c (not shown in FIG. 3) are slightly smaller than one end portion 11a of the strut portion 11. It extends from a position closer to the other end 11b side. Further, as the blade portion 12a is stretched, one side 12a1 is tilted so as to approach the other side 12a2, and as the blade portion 12b is stretched, one side 12b1 is tilted so as to approach the other side 12b2. As the blade portion 12c is stretched, one side 12c1 is inclined so as to approach the other side 12c2.

Further, as shown in FIG. 4, the cross section of the blade portion 12a has a tapered tapered portion 12a4 so as to become thinner as it approaches one side 12a1. The blade portions 12b and 12c also have this tapered portion. Further, one end 11a of the support column 11 has a tapered shape.

As described above, as the blade portions 12a, 12b, and 12c are stretched radially, the length in the direction orthogonal to the stretching direction becomes shorter, and one end portion 11a of the support column 11 is tapered, so that the ground is ground. It can be easily buried inside.

The support column portion 11 will be described in more detail with reference to FIG. As shown in FIG. 5 showing the cross section of the strut portion 11, the inner diameter of the pile through hole 11c of the strut portion 11 increases from the other end portion 11b of the strut portion 11 toward one end portion 11a, and the inner diameter of the strut portion 11 increases. The inner wall of the pile through hole 11c is inclined linearly with respect to the central axis and has a tapered shape. The tapered shape of the inner diameter of the pile through hole 11c of the strut portion 11 is configured so that the inner diameter of one end portion 11a side of the strut portion 11 increases at an angle of φ with respect to the central axis of the strut portion 11. The φ in Example 1 is configured to be 1.5 ° to 2 °.

Since the taper angle φ is 1.5 ° to 2 °, when the pile fall prevention device 10 is inserted into the pile K and the pile through hole 11c is embedded in the ground, the soil in the ground becomes the pile through hole 11c. It becomes easier to get inside. The density of soil in the pile through hole 11c becomes high. As a result, the pile K penetrating the pile through hole 11c is firmly held by the dense soil. The taper angle φ does not necessarily have to be 1.5 ° to 2 °, but if it is 3 ° or more, the pressure of the soil becomes too strong and it may be difficult to bury it in the ground. On the contrary, when the taper angle φ becomes close to zero, it becomes easy to bury it in the ground, but the density of the soil in the pile through hole 11c does not increase and the holding of the pile K does not become strong.

(How to use the pile fall prevention device)
The usage and features of the pile fall prevention device 10 will be described with reference to FIG. First, the desired pile K is buried in the ground (FIG. 6 (a)). Next, the pile K is inserted so as to penetrate the pile through hole 11c of the pile fall prevention device 10, and the burying work is performed in the ground (FIG. 6 (b)). In this burying work, the other sides 12a2, 12b2, 12c2 of the blade portions 12a, 12b, 12c of the pile fall prevention device 10 are pushed into the ground by hand or hit with a mallet or the like to be pushed into the ground. At this time, since the inner wall is tapered so that the inner diameter of the pile through hole 11c increases as it approaches one end 11a, soil easily enters the pile through hole 11c and the density of the soil increases. I will go.

When the pile fall prevention device 10 is completely embedded in the ground in this way, the density of the soil in the pile through hole 11c becomes higher than the density of the surrounding soil, and the pile K is firmly held by the high density soil ( FIG. 6 (c). This situation is shown in detail in FIG. 6 (d). Since the pile K is firmly held by the high-density soil, the pile K can be held firmly even when the inner diameter of the pile through hole 11c is considered to be larger than the outer diameter of the pile K. That is, it is not necessary to remake the inner diameter of the pile through hole 11c according to the outer diameter of the pile K. The inner diameter of the pile through hole 11c may be smaller than the outer diameter of the pile K.

In the first embodiment, the inner diameter of the pile through hole 11c of the support column 11 has a taper shape that increases from the other end 11b toward one end 11a, but this is not necessarily the case. It is not limited to, and can be changed as appropriate. For example, the inner wall of the pile through hole 11c is inclined so as to be separated from the central axis of the column portion 11 from the intermediate position in the longitudinal direction of the pile through hole 11c toward one end 11a, that is, the pile through hole 11c. The inner wall may have a tapered shape in which the inner diameter increases toward one end 11a. At least from a predetermined position in the longitudinal direction of the pile through hole 11c toward one end 11a, the inner wall of the pile through hole 11c is inclined so as to be separated from the central axis of the column portion 11, that is, the pile through hole 11c The inner wall may have a tapered shape in which the inner diameter increases toward one end 11a.

Here, the "predetermined position" in the longitudinal direction of the pile through hole 11c may be a position where soil can easily enter the pile through hole 11c when the pile fall prevention device 10 is embedded in the ground. In the first embodiment, the length of the strut portion 11 is about 100 mm and the taper angle φ of the inner diameter of the pile through hole 11c is 1.5 ° to 2 °. However, if the length of the strut portion 11 is shortened, the pile penetrates. It is preferable that the taper angle φ of the inner diameter of the hole 11c is 3 ° or more, and the “predetermined position” is set as close to the other end 11b as possible. Further, if the length of the strut portion 11 becomes long, the taper angle φ of the inner diameter of the pile through hole 11c may be set to 1 ° to 1.5 °, and the “predetermined position” may be a position relatively close to one end portion 11a. Good.

Further, in the first embodiment, the inner wall of the pile through hole 11c is inclined linearly with respect to the central axis of the support column 11 and has a tapered shape, but the configuration is not necessarily limited to this and can be changed as appropriate. It is possible. For example, the inner wall of the pile through hole 11c may be inclined in a stepped shape with respect to the central axis of the support column 11 and have a tapered shape.

Further, in the first embodiment, the blade portions are configured to be evenly provided at intervals of 120 °, but the present invention is not necessarily limited to this and can be appropriately changed. For example, the number of blades may be four or more, or two. Further, the intervals between the blades do not have to be even.

Further, in the first embodiment, the support column portion 11 and the blade portions 12a, 12b, and 12c are all integrally molded of synthetic resin, but the configuration is not necessarily limited to this, and can be appropriately changed. For example, the strut portion 11 and the blade portions 12a, 12b, and 12c may be formed of different materials and screwed together, or both may be made of a metal such as iron and welded to each other. Good.

Further, in the first embodiment, the taper angle φ between the central axis of the support column 11 and the inner diameter of the pile through hole 11c is configured to be 1.5 ° to 2 °, but the taper angle φ is not necessarily limited to this and can be changed as appropriate. is there. For example, in the case of soft soil, the taper angle may be 3 ° or more.

Further, in the first embodiment, the strut portion 11 has a substantially cylindrical shape and the pile through hole 11c has a substantially cylindrical hole shape, but the present invention is not necessarily limited to this and can be appropriately changed. For example, the strut portion 11 may have a substantially square pillar shape or a substantially conical shape. Further, the pile through hole 11c may have a hole shape of a substantially square pillar or a substantially inverted conical shape. The optimum shape can be selected depending on the shape of the pile K and the convenience of manufacturing.

As described above, in the first embodiment, it is a pile fall prevention device for preventing a pile whose one end is embedded in the ground from falling, and has a pile through hole having a substantially cylindrical hole shape through which the pile can penetrate and is long. A strut portion extending in the direction and having one end portion that can be embedded in the ground on one side in the longitudinal direction and the other end portion on the other side in the longitudinal direction, and a strut portion radially from the outer peripheral surface of the strut portion. A plurality of blade portions to be extended are provided, and the inner diameter of the pile through hole increases with respect to the central axis of the strut portion so that the inner diameter of the pile through hole increases from at least a predetermined position in the longitudinal direction of the strut portion toward the one end portion. A low-cost pile fall prevention device that can be easily used can be realized by a pile fall prevention device characterized by tilting.

Further, the pile collapses by inclining with respect to the central axis of the support portion so that the inner diameter of the pile through hole increases from at least a predetermined position in the longitudinal direction of the support portion toward the one end portion. When the prevention device is buried in the ground, the soil can easily enter the support column and the pile can be held firmly.

In the second embodiment of the present invention, the outer peripheral surface of the support column is inclined so as to approach the central axis of the support column from the other end to the one end of the support column of the pile fall prevention device. Therefore, it is different from the first embodiment. The second embodiment will be described with reference to FIG. FIG. 7 is a cross-sectional view illustrating a support column portion according to a second embodiment of the present invention.

In the pile fall prevention device 20 according to the second embodiment, the outer peripheral surface of the strut portion 21 is straight so as to approach the central axis of the strut portion 21 as it goes from the other end portion 21b of the strut portion 21 toward one end portion 21a. It is inclined like a stake. That is, the outer peripheral surface of the strut portion 21 has a tapered shape in which the outer diameter decreases toward one end portion 21a. The tapered shape of the outer peripheral surface of the strut portion 21 is configured such that the outer diameter of one end portion 21a is smaller than the outer diameter of the other end portion 21b at an angle of θ.

As described above, the outer peripheral surface of the support column 21 has a tapered shape with an angle θ, and the outer diameter of one end 21a is smaller than the outer diameter of the other end 21b, so that the pile fall prevention device 20 When burying in the ground, the support column 21 pushes away the soil on the ground, so that it can be easily buried.

Further, also in the second embodiment, as in the first embodiment, the inner diameter of the pile through hole 21c of the strut portion 21 increases from the other end portion 21b of the strut portion 21 toward one end portion 21a, and the strut portion 21 The inner wall of the pile through hole 21c is inclined and tapered with respect to the central axis of the pile. The tapered shape of the inner diameter of the pile through hole 21c of the strut portion 21 is configured so that the inner diameter of one end portion 11a side of the strut portion 11 increases at an angle of φ with respect to the central axis of the strut portion 21. Both φ and θ in Example 2 are configured to be 1.5 ° to 2 °.

Since the taper angle φ is 1.5 ° to 2 °, when the pile fall prevention device 20 is inserted into the pile K and the pile through hole 21c is embedded in the ground, the soil in the ground becomes the pile through hole 21c. It becomes easier to enter the inside, and the density of soil in the pile through hole 21c becomes high. As a result, the pile K penetrating the pile through hole 21c is firmly held by the dense soil. The taper angle φ does not necessarily have to be 1.5 ° to 2 °, but if it is 3 ° or more, the pressure of the soil becomes too strong and it may be difficult to bury it in the ground. On the contrary, when the taper angle φ becomes close to zero, it becomes easy to bury it in the ground, but the density of the soil in the pile through hole 11c does not increase and the holding of the pile K does not become strong.

The taper angle θ does not necessarily have to be 1.5 ° to 2 °, but may be 3 ° or more, or may be about 1 °.

In the second embodiment, the outer peripheral surface of the strut portion 21 is inclined so as to approach the central axis of the strut portion 21 as it goes from the other end portion 21b of the strut 21 toward one end portion 21a, that is, the strut. The outer peripheral surface of the portion 21 has a tapered shape in which the outer diameter decreases toward one end portion 21a, but the present invention is not necessarily limited to this and can be appropriately changed. For example, the outer peripheral surface of the strut portion 21 is inclined so as to approach the central axis of the strut portion 21, that is, the outer peripheral surface of the strut portion 21 as the strut portion 21 is directed from an intermediate position in the longitudinal direction toward one end portion 11a. May have a tapered shape in which the outer diameter becomes smaller toward one end 21a. The outer peripheral surface of the strut portion 21 is inclined so as to approach the central axis of the strut portion 21, that is, the outer peripheral surface of the strut portion 21 as it is directed from a predetermined position in the longitudinal direction of the strut portion 21 toward one end portion 21a. May be configured to have a tapered shape in which the outer diameter becomes smaller toward one end 21a.

Here, the "predetermined position" in the longitudinal direction of the support column 21 may be a position that facilitates embedding in the ground when the pile fall prevention device 10 is embedded in the ground. In the first embodiment, the length of the strut portion 11 is about 100 mm and the taper angle θ of the outer diameter of the strut portion 11 is 1.5 ° to 2 °. However, if the length of the strut portion 11 is shortened, the taper angle is set. It is better to set θ to 3 ° or more and set the “predetermined position” to a position as close to the other end 11b as possible. Further, if the length of the strut portion 11 becomes long, the taper angle θ may be set to 1 ° to 1.5 °, and the “predetermined position” may be a position relatively close to one end portion 11a.

Further, in the second embodiment, the outer peripheral surface of the strut portion 21 is configured to be linearly inclined so as to approach the central axis of the strut portion 21, but the present invention is not necessarily limited to this and can be changed as appropriate. is there. For example, the outer peripheral surface of the strut portion 21 may be inclined in a stepped manner so as to approach the central axis of the strut portion 21.

Further, in the second embodiment, the inner diameter of the pile through hole 21c of the support column 21 has a tapered shape that increases from the other end 21b toward one end 21a, but this is not necessarily the case. It is not limited to, and can be changed as appropriate. For example, the inner wall of the pile through hole 21c is inclined so as to be separated from the central axis of the support column 21 as the pile through hole 21c is directed toward one end 21a from the intermediate position in the longitudinal direction, that is, the pile through hole 21c The inner wall may have a tapered shape in which the inner diameter increases toward one end 21a. At least from a predetermined position in the longitudinal direction of the pile through hole 21c toward one end 21a, the inner wall of the pile through hole 21c is inclined so as to be separated from the central axis of the support column 21, that is, the pile through hole 21c. The inner wall may have a tapered shape in which the inner diameter increases toward one end 21a.

As described above, in the second embodiment, the outer peripheral surface of the strut portion 21 has a tapered shape with an angle θ, and the outer diameter of one end portion 21a is smaller than the outer diameter of the other end portion 21b. , The support column 21 pushes away the soil on the ground, so that it can be easily buried. Further, when the pile through hole 21c of the strut portion 21 has a tapered shape with an angle φ and the inner diameter of one end portion 21a is larger than the inner diameter of the other end portion 21b, the pile through hole 21c is buried in the ground. The soil easily enters the inside of the pile through hole 21c, and the pile K inserted into the pile through hole 21c is firmly held by the dense soil in the pile through hole 21c.

Example 3 of the present invention is different from Examples 1 and 2 in that the inner peripheral surface of the strut portion has a recess corresponding to a protrusion provided on the surface of the pile along the longitudinal direction. .. The third embodiment will be described with reference to FIGS. 8 and 9. FIG. 8 is a diagram illustrating a pile according to a third embodiment of the present invention. FIG. 9 is a top view (a) and a front view (b) for explaining the pile fall prevention device according to the third embodiment of the present invention.

As shown in FIG. 8, a pile K'having a protrusion 39 on the surface may be used for the pile to prevent pulling out. When such a pile K'is used, depending on the size of the protrusion 39, if the inner diameter of the pile through hole of the pile fall prevention device includes the protrusion, the pile K'in the pile through hole has too much gap and comes off. It may be easy to do, and if the size does not include protrusions, the pile K'cannot be inserted into the pile through hole. Therefore, it is necessary to make a work that can be inserted into the pile through hole of the pile fall prevention device.

In the third embodiment, as shown in FIG. 9, recesses 33a, 33b, 33c corresponding to the protrusions 39 provided on the surface of the pile K'are provided on the inner peripheral surface of the support column 31 of the pile fall prevention device 30. It has along the longitudinal direction. The size of the recesses 33a, 33b, and 33c is such that the protrusion 39 can smoothly pass through. As a result, the pile fall prevention device 30 can be inserted into the pile K'provided with the protrusion 39.

As described above, in the third embodiment, the inner peripheral surface of the pile through hole of the support column has a recess corresponding to the protrusion provided on the pile surface along the longitudinal direction, so that the protrusion is provided on the surface. It is also possible to handle the piles that you have.

Example 4 of the present invention is different from Examples 1 to 3 in that the strut portion can be divided by a dividing surface provided along the longitudinal direction. The fourth embodiment will be described with reference to FIG. FIG. 10 is a diagram illustrating a post-division (a) and a pre-division (b) of the pile fall prevention device according to the fourth embodiment of the present invention.

Inside the pile, one end, which is the tip on the side to be embedded in the ground, has a wedge-shaped pull-out prevention part larger than the outer diameter of the pile, and the other end has a lid larger than the outer diameter of the pile. Some have a shaped lid. In the pile with such a shape, the pile is inserted into the pile through hole of the support column in the pile fall prevention device 10 of the first embodiment, the pile fall prevention device 20 of the second embodiment, and the pile fall prevention device 30 of the third embodiment. I can't let you.

In the fourth embodiment, the strut portion can be divided in order to correspond to the pile having the wedge-shaped pull-out prevention portion and the lid portion. Specifically, the strut portion 41 has a dividing surface 43 along the longitudinal direction so that the strut portion 41 can be divided into a first strut portion 41d and a second strut portion 41e (see FIG. 10A). The divided surface 43 has a fitting portion in the longitudinal direction so that the first strut portion 41d and the second strut portion 41e can be fitted to each other. FIG. 10A shows the strut portion 41 after the division, and FIG. 10B shows the strut before the division (that is, the state where the first strut portion 41d and the second strut portion 41e are fitted to each other). Part 41 is shown.

When such a pile fall prevention device 40 is used, the pile K buried in the ground is sandwiched between the first support column portion 41d and the second support column portion 41e of the divided pile fall prevention device 40. The pile fall prevention device 40 may be buried in the ground after the pillars 41 are fitted together to form an integral support column 41.

Further, in the fourth embodiment, the four blade portions 42a, 42b, 42c, 42d are evenly extended from the support column portion 41 at 90 ° intervals, and the blade portions 42a, 42b are fixed to the first support column portion 41d, and the blades are formed. The portions 42c and 42d are fixed to the second support column portion 41e. With this configuration, the first strut portion 41d and the second strut portion 41e can be configured in the same shape, and the manufacturing efficiency is improved.

As described above, in the fourth embodiment, since the support column can be divided by the dividing surface provided along the longitudinal direction, one end of the pile has a wedge shape to prevent it from coming off, and the other end. Even if the portion has a lid portion, the strut portion can be divided and a pile fall prevention device can be attached to the pile.

Example 5 of the present invention is different from Examples 1 to 4 in that it has six small blades. The fifth embodiment will be described with reference to FIG. FIG. 11 is a top view (a) and a front view (b) for explaining the pile fall prevention device according to the fifth embodiment of the present invention.

The pile fall prevention device 50 according to the fifth embodiment has a pile through hole 51c having a substantially cylindrical hole shape having an inner diameter through which the pile K can penetrate, extends in the longitudinal direction, and can be embedded in the ground on one side in the longitudinal direction. A strut portion 51 having a substantially cylindrical shape having one end portion 51a and the other end portion 51b on the other side in the longitudinal direction, and six blade portions extending radially from the outer peripheral surface of the strut portion 51. It includes 52a, 52b, 52c, 52d, 52e, and 52f.

The length of the blade portions 52a, 52b, 52c, 52d, 52e, and 52f in the stretching direction is about 35 mm, which is smaller than that of other examples. Instead of making the blades smaller, the number of blades was set to 6, and the area in contact with the soil was secured. As a result, it has the same holding power as the holding power in other examples. Further, by reducing the size of the blade portions 52a, 52b, 52c, 52d, 52e and 52f, the efficiency during transportation is improved.

Further, in the fifth embodiment, as shown in FIG. 11, the width of the blade portion is between the other side 52b2 and the one side 52b1 of the blade portion 52b, with the side closer to the other side 52b2 as the boundary. Have a taper shape in opposite directions. That is, it has a tapered shape in which the width narrows from this boundary toward the other side 52b2, and has a tapered shape in which the width narrows from this boundary toward the other side 52b1. This shape is the same for the blade portions 52a, 52c, 52d, 52e, and 52f. This shape is because when the pile fall prevention device 50 is molded, taking out from the mold member is taken into consideration to improve the manufacturing efficiency. As a result, the mold member can be composed of two upper and lower parts, and the mold member can be removed upward and downward, so that the molding operation can be easily performed.

The inner diameter of the pile through hole 51c of the strut 51 increases from the other end 51b of the strut 51 toward one end 51a, and the inner wall of the pile through hole 51c is inclined with respect to the central axis of the strut 51. It has a tapered shape.

As described above, in the fifth embodiment, by providing six miniaturized blades, the pile can be firmly held when buried in the ground even though it is small.

The pile fall prevention device in the present invention can be widely used in the field of embedding columns or piles in the ground.

10: Pile fall prevention device
11: Support
11a: One end
11b: The other end
11c: Pile through hole
11d: Tapered part
12a: Blade part
12b: Blade part
12c: Blade part
12a1: One side
12a2: The other side
12a3: Side
12a4: Tapered part
12b1: One side
12b2: The other side
12b3: Side
20: Pile fall prevention device
21: Support
21a: One end
21b: The other end
21c: Pile through hole
21d: Tapered part
30: Pile fall prevention device
31: Support
31a: One end
31b: The other end
31c: Pile through hole
32a: Blade part
32b: Blade part
32c: Blade part
39: Protrusion
40: Pile fall prevention device
41: Support
41c: Pile through hole
41d: First strut
41e; 2nd support
42a: Blade part
42b: Blade part
42c: Blade part
42d: Blade part
43: Divided surface
51: Support
51a: One end
51b: The other end
51c: Pile through hole
52a: Blade part
52b: Blade part
52c: Blade part
52d: Blade part
52e: Blade part
52f: Blade part
K: Pile
K': Pile
G: Ground

Claims (3)

It is a pile fall prevention device that prevents piles with one end embedded in the ground from falling.
The pile has a substantially cylindrical hole-shaped pile through hole through which the pile can penetrate, extends in the longitudinal direction, and one end that can be embedded in the ground on one side in the longitudinal direction and the other on the other side in the longitudinal direction. With the strut part with the end of
A plurality of blades extending radially from the outer peripheral surface of the support column are provided.
The inner wall of the pile through hole is inclined with respect to the central axis of the support so that the inner diameter of the pile through hole increases from at least a predetermined position in the longitudinal direction of the support toward the one end. Pile fall prevention device featuring. The strut portion has a substantially cylindrical shape and has a substantially cylindrical shape.
The outer wall of the strut is inclined with respect to the central axis of the strut so that the outer diameter of the strut becomes smaller toward at least one end of the strut from a predetermined position in the longitudinal direction of the strut. The pile fall prevention device according to claim 1. The pile fall prevention device according to claim 1 or 2, wherein the strut portion can be divided by a dividing surface provided along the longitudinal direction.

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