JP2020080688A - Coupling structure of tree falling prevention tool and tree falling prevention method - Google Patents

Abstract

To provide a coupling structure of a tree falling prevention tool capable of reinforcing a foundation on which a tree is planted, and preventing surely, falling of a tree.SOLUTION: There is provided a coupling structure 100 of a plurality of tree falling prevention tools 1 which are embedded in soil so that a root of a planted tree becomes entangled to the tools, each tree falling prevention tool 1 comprises: three or more vertical materials 2 extending in parallel; and annular holding bodies 4 supported by the vertical materials 2. The plurality of holding bodies 4 are fixed at an interval along the vertical materials 2, the plurality of tree falling prevention tools 1 arranged in proximity are coupled by a spiral coupling member 8.SELECTED DRAWING: Figure 3

Description

The present invention relates to a fallen tree preventive connecting structure and a fallen tree preventing method, and more particularly, a fallen tree preventive connecting structure that is embedded in soil so that the roots are entangled by the growth of a planted tree, and this. The present invention relates to a method for preventing fallen trees.

Patent Document 1 discloses a structure for embedding in a soil to fix a tree to the ground. This structure is composed of a plurality of modular elements having supporting legs, and the supporting legs of adjacent modular elements are connected by a tubular body.

US Publication No. 2013/0139433

The above-mentioned conventional structure can support the tree by the root of the tree entering the modular element, but since the adjacent modular elements are firmly connected by the tubular body, they are modular due to ground displacement such as an earthquake. When the element is subjected to a large earth pressure, the modular element may not be able to absorb the earth pressure sufficiently and may be deformed or damaged, so that there is a problem that a good fall prevention effect cannot be obtained.

On the other hand, the importance of the disaster prevention function of trees has been re-recognized in recent years in order to reduce the damage to residential land and farmland caused by natural disasters such as tsunamis and typhoons or human disasters, and it is required to improve the rooting of trees. There is.

Therefore, it is an object of the present invention to provide a connection structure of a fall prevention tool and a fall prevention method capable of strengthening the ground for planting trees and surely preventing fall of trees.

The object of the present invention is a connection structure of a plurality of fallen tree preventive tools embedded in soil so that roots are entangled by the growth of a planted tree, wherein each of the fallen tree preventers extends in parallel with each other. A plurality of supporting portions and an annular holding body supported by the supporting portions are provided, and a plurality of the holding bodies are fixed at intervals along the supporting portion, and the plurality of fallen tree preventive devices. Is achieved by the connection structure of the fallen tree preventing tool connected by the spiral connecting member.

In the connection structure of the fallen tree preventive tool described above, it is preferable that the plurality of the fallen tree preventive tools are connected to each other by mounting the connecting member around the supporting portions arranged in parallel with each other. Alternatively, in the connection structure of the fallen tree preventive tool described above, a plurality of the fallen tree preventive tools are connected to each other by attaching the connecting member around a portion extending in the same direction of each of the holding bodies arranged close to each other. Preferably.

Further, the object of the present invention is a fallen tree preventing method using a plurality of fallen tree preventing tools embedded in the soil so that the roots are entangled by the growth of a planted tree, wherein the respective fallen tree preventing tools are mutually A plurality of supporting portions extending in parallel and an annular holding body supported by the supporting portion are provided, and a plurality of the holding bodies are fixed at intervals along the supporting portion. A connecting step of arranging the fallen tree preventer close to the ground and connecting with a spiral connecting member, a fixing step of fixing the connected fallen tree preventer to the ground with a pile member, and the fixed fallen tree preventer And a step of planting a tree in the vicinity of the fallen tree preventer after the tree is buried in the soil.

In the above fallen tree prevention method, the connecting step arranges the supporting portions of any one of the plurality of fallen tree preventing tools in parallel with each other, and along the supporting portions while rotating the connecting member. It is preferable to mount the connecting member around the supporting parts by advancing. Alternatively, in the above-described fallen tree prevention method, the connecting step arranges the holding bodies of any one of the plurality of fallen tree prevention tools in close proximity to each other, and rotates the connecting member in the same direction of the respective holding bodies. It is preferable to mount the connecting member around the holding body by advancing along the portion extending to the.

ADVANTAGE OF THE INVENTION According to this invention, the ground for planting trees can be strengthened, and the connection structure of the fall prevention tool and the fall prevention method that can surely prevent fall of trees can be provided.

FIG. 4 is a side view of a fallen tree preventive tool used in the connection structure of the fallen tree preventive tool according to the embodiment of the present invention. It is a top view of the fallen tree preventive tool shown in FIG. It is a side view which shows the connection structure of the fallen tree preventive tool shown in FIG. It is a top view of the connection structure of the fallen tree guard shown in FIG. It is a schematic process drawing of the fallen tree prevention method which concerns on one Embodiment of this invention. It is a schematic diagram of the tree supported by the fallen tree prevention method shown in FIG. It is a side view which shows the connection structure of the fallen tree guard which concerns on other embodiment of this invention. It is a top view which shows the connection structure of the fallen tree|fall prevention tool which concerns on other embodiment of this invention. It is a side view which shows the modification of a fallen tree preventive tool. FIG. 10 is a plan view of the fallen tree protector shown in FIG. 9. It is a side view which shows the other modification of a fallen tree preventive tool. It is a side view which shows the further another modified example of a fallen tree preventive tool. It is a schematic diagram for demonstrating the fallen tree prevention method which concerns on other embodiment of this invention. It is a schematic diagram for demonstrating the fallen tree prevention method which concerns on other embodiment of this invention. It is a side view which shows the connection structure of the fallen tree|fall prevention tool which concerns on other embodiment of this invention.

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a side view of a fallen tree preventive tool used for a connection structure of a fallen tree protector according to an embodiment of the present invention, and FIG. 2 is a plan view of the fallen tree preventer shown in FIG. 1. As shown in FIGS. 1 and 2, the fallen tree preventive tool 1 includes four vertical members 2 and two holding members 4 supported by the vertical members 2, and is formed into a cubic shape as a whole. ..

The vertical member 2 is a solid rod-shaped or hollow cylindrical member made of metal, resin, or the like, and is made of a straight rod-shaped reinforcing bar in the present embodiment. Each of the vertical members 2 is arranged at each corner of the rectangular shape in plan view so as to extend in parallel to each other, and the entire longitudinal direction constitutes a supporting portion for supporting the holding body 4. It is preferable that the surface of the vertical member 2 has irregularities such as ribs and knots of reinforcing bars, which increases the surface area and enhances the adhesion to the soil when buried.

The holding body 4 is an annular member made of metal, resin, or the like. In the present embodiment, the reinforcing bars are bent in a rectangular frame shape so as to surround each vertical member 2 along a plane orthogonal to each vertical member 2. The hook portions 4a and 4b at both ends are engaged with the vertical member 2. As for the surface of the holding body 4, it is preferable that unevenness is formed similarly to the vertical member 2.

The two holding bodies 4 and 4 are arranged in parallel with each other at intervals along the vertical member 2, and are fixed to the vertical member 2 by a binding tool 6 such as a metal wire. The method of fixing the holding body 4 to the vertical member 2 is not particularly limited, and for example, clamping with a clamp, caulking of a metal pipe, welding, or the like may be performed.

FIG. 3 and FIG. 4 are a side view and a plan view showing a connecting structure of the fallen tree guard 1 shown in FIG. 1, respectively. As shown in FIGS. 3 and 4, the connection structure 100 of the fallen tree preventive tool 1 is configured by connecting a plurality of fallen tree preventive machines 1, 1 arranged in proximity by a plurality of connecting members 8, 8. .. The connecting member 8 has a shape in which a rod is spirally wound, and for example, a spiral streak can be preferably used.

The fallen tree preventive tools 1, 1 are arranged on both sides of one side of the holding bodies 4, 4 that are close to each other so that the vertical members 2, 2; The materials 2 and 2 are mounted so as to surround them. It is preferable that a slight gap (for example, about 0.5 to 3 cm) be formed between the support members 2 and 2 and the connecting member 8. For example, the maximum distance between the outer peripheries of the support members 2 and 10 is 10 cm. In this case, the inner diameter of the spiral of the connecting member 8 is preferably 12 cm. By configuring the connecting structure 100 in this manner, even if the ground displacement occurs after being buried in the soil, the displacement of the fallen tree preventive tools 1, 1 in any direction is connected to the support members 2, 2. Since it can be absorbed by the gap with the member 8, it is possible to flexibly cope with the ground displacement while surely maintaining the coupled state of the fallen tree preventive tools 1, 1. However, since the connecting member 8 is elastically deformable, the connecting member 8 may be in contact with both of the supports 2 and 2. The spiral pitch of the connecting member 8 may be appropriately set according to the interval between the upper and lower holders 4 and 4 so as not to interfere with the upper and lower holders 4 and 4 at the same time.

FIG. 5 is a schematic process diagram for explaining a fallen tree prevention method for planted trees according to an embodiment of the present invention. When a large number of trees are planted in a large planting area such as when planting a disaster prevention forest, first, as shown in FIG. 5(a), the ground 10 in the planting area is excavated to form a large planting hole. After forming 12, a plurality of fallen tree preventive tools 1 are arranged close to each other at the bottom of the planting hole 12 so that the vertical members 2 are in the vertical direction. The size of each fallen tree preventive tool 1 is not particularly limited, but may be, for example, a cubic shape with each side of about 1 m. Then, the connecting members 8 are advanced in the direction of the arrow along the vertical members 2 and 2 of the fallen tree preventive tools 1 and 1 that extend in close proximity to each other and are connected around the vertical members 2 and 2. By mounting the member 8, the fallen tree preventive tools 1 and 1 are connected (connection step).

Next, as shown in FIG. 5B, the connection structure 100 of the fallen tree guard 1 obtained in the connection step is fixed to the ground (fixing step). That is, a plurality of pile members 20 each having a hook-shaped engaging portion 22 are driven into the bottom portion of the planting hole 12 as indicated by an arrow, and the respective engaging portions 22 are held by the holder 4 of each fall prevention tool 1. The fallen tree preventive 1 is fixed to the ground at the bottom of the planting hole 12 by locking the fallen tree preventive 1 to the ground. The pile member 20 is made of, for example, a reinforcing bar or the like, and is preferably driven into the soil at a depth of, for example, about 0.5 to 2.5 m from the bottom of the planting hole 12 so that the fall prevention tool 1 can be reliably fixed. .. In the present embodiment, the pile member 20 is driven into the outside of the connecting member 8, but the pile member 20 may be driven into the inside of the connecting member 8 along the spiral axis. Since soil enters the inside of the connecting member 8 as described later, by arranging the pile member 20 inside the connecting member 8, the pile member 20 can be held from the surroundings, and the connecting structure 100 can be securely held. Can be fixed. It is not always necessary to provide the hook-shaped locking portion 22, and it is possible to use, for example, a straight line or the like, and the fallen tree preventive tool 1 can be fixed through the buried soil.

Then, as shown in FIG. 5C, after burying the connecting structure 100 with soil 24 such as excavated soil or improved soil, a plurality of saplings of trees 30 are planted above the connecting structure 100 (planting). Step). As the planted tree 30 grows so that the roots 32 expand into the soil in search of water and nutrients as it grows, as shown in FIG. 6, the inside of the holder 4 of the fallen tree preventive tool 1 and the upper and lower holders The root 32 of the tree 30 can be passed through between 4 and 4 and entangled with the holding body 4. The root of the tree 30 not only engages with the fall prevention tool 1 arranged immediately below, but also engages with the fall prevention tool 1 and the spiral connecting member 8 which are adjacent to the root 30. The effect is enhanced. The tree 30 is preferably planted directly above each fall prevention tool 1, but may be in the vicinity of the fall prevention tool 1, and even if the tree 30 is planted diagonally above and to the left or right of the fall prevention tool 1. Good.

According to the fallen tree prevention method described above, the connection structure 100 of the fallen tree preventive tool 1 is embedded in the soil so as to be engaged with the growth of the roots of the sapling, whereby the ground can be strengthened and mainly the root system of the tree 30. Since the tip side can be entwined with the fallen tree preventer 1, a large number of growing or branched roots (for example, horizontal roots or drooping roots) are held by the fallen tree preventer 1 to firmly support the tree 30. The fallen tree can be surely prevented. Further, even if a sediment disaster or erosion of a river occurs, the soil is easily retained inside the fallen tree preventive tool 1, which serves to strengthen the ground. Therefore, it is possible to prevent fallen trees.

Further, in the connecting structure 100 of the fallen tree preventers 1, the plurality of fallen tree preventers 1 are connected by the spiral connecting member 8. Therefore, even if the ground displacement occurs due to an earthquake or the like, each fallen tree preventer 1 The positional deviation between them can be absorbed by the connecting member 8, and it is possible to maintain a good connected state while preventing damage to each fall prevention tool 1. As a result, a wide range of ground reinforcement and fallen tree prevention using a large number of fallen tree preventive tools 1 can be performed easily and reliably.

If the depth from the ground 10 to the upper holding body 4 of the fallen tree guard 1 is too large, the horizontal root extending along the ground surface will be difficult to engage with the holding body 4, while if it is too small, erosion of the soil surface will occur. Since the fallen tree preventive tool 1 is more easily exposed, it is preferable that the fallen tree preventive tool 1 is, for example, about 30 cm, and most of the fallen tree preventive tool 1 is preferably arranged at a depth of about 30 to 130 cm. The type of the tree 30 to be planted is not particularly limited, but it is preferable that the tree 30 has a large root 32 strength and a large spread in the depth direction. The fallen tree preventive tool 1 can be preferably used for preventing fallen trees in disaster prevention forests such as windbreak forests and tide forests (windbreak forests, tide forests, sand protection forests, fire protection forests, etc.). When a plurality of trees 30 are planted, the same kind of trees 30 may be used, but a plurality of kinds of trees 30 having different root systems are preferable. Even if the tree 30 is a single body, it is possible to obtain a good reinforcing effect by the fallen tree preventive tool 1. However, by connecting and using a plurality of trees 30, it is possible to more reliably exhibit the function as a disaster prevention forest. You can The tree 30 to be planted is preferably a native species that naturally lives in the land. The type of tree 30 to be planted may be a conifer such as cedar, cypress, larch, and the fallen tree preventive device 1 can be used, for example, in an artificial forest where many plants of the same type are planted.

Although one embodiment of the present invention has been described above in detail, a specific aspect of the present invention is not limited to the above embodiment. For example, in the connecting structure 100 of the present embodiment, the fallen tree guards 1 and 1 that are arranged adjacent to each other are connected by the plurality of connecting members 8. However, even if they are connected by a single connecting member 8. Good. It is also possible to connect three or more fall prevention tools 1 by a single connecting member 8. For example, the fall protection tools 1 are arranged in a matrix and four vertical members corresponding to the intersections of the matrix. A connecting member 8 can be mounted around the 2.

Further, the connecting member 8 of the present embodiment is mounted around the vertical members 2, 2 of the plurality of fall prevention tools 1, 1, but around the portions of the holding bodies 4, 4 extending in the same direction. May be attached to. For example, as shown in a side view in FIG. 7, a plurality of fallen tree protectors 1 and 1 are arranged so that one side of the holding bodies 4 and 4 extends along the same straight line, and the spiral axis follows the straight line. The connecting member 8 can be mounted around the holders 4, 4. Alternatively, as shown in the plan view of FIG. 8, a plurality of fall prevention tools 1, 1 are arranged such that one sides of the holding bodies 4, 4 are close to each other and are parallel to each other, and are connected around the parallel portions. The member 8 can be attached.

Further, the fallen tree preventive tool 1 may have various configurations other than the configuration of the present embodiment. For example, in the present embodiment, the fallen tree protector 1 is formed in a cube shape as a whole, but the shape is not particularly limited, and when trees are planted in a row, they are arranged in a row direction. It may be a long rectangular parallelepiped.

Further, the fallen tree preventive tool 1 according to the present embodiment has four vertical members 2 constituting the support portion that supports the holding body 4, but three or more vertical members 2 can support the annular holding body 4. I wish I had it. For example, when the holding body 4 has a polygonal shape of a triangle or more, it is preferable to arrange the vertical members 2 at the tops of the polygonal shapes. When the holder 4 is circular or elliptical, it is preferable to arrange an appropriate number of the vertical members 2 at equal intervals along the circumferential direction of the holder 4.

Further, in the present embodiment, by disposing the two holding bodies 4 at intervals along the vertical member 2, the roots 32 of the tree 30 can be passed between the two holding bodies 4 and the respective holding bodies 4 can be passed. Engage with roots extending to different depth positions, so that the tree 30 can be reliably supported. The number of holding bodies 4 may be three or more, and the number and spacing of the holding bodies 4 are appropriately set in consideration of the thickness of the root 32 of the tree 30 to be planted, the depth at which the root 32 grows, and the like. Preferably.

Further, the supporting portion for supporting the holder 4 in the fallen tree preventive tool 1 can be formed by a member other than the straight rod-shaped vertical member 2 as in the present embodiment. For example, as shown in FIG. 9 and FIG. 10 in a side view and a plan view, respectively, both sides of the U-shaped bending member 40 extending in parallel to each other are used as supporting portions 42, 42, and the fallen tree preventive tool 1 is configured. You can also do it. In the fallen tree guard 1 shown in FIGS. 9 and 10, the four bending members 40 are arranged in parallel with each other at equal intervals, and the other four bending members 40 are arranged in parallel with each other at equal intervals. By doing so, 16 supporting portions 42 are formed from the eight bending members 40. As described above, by configuring the support portion 42 by the both side portions of the plurality of U-shaped bending members 40, it is possible to secure the strength of the fallen tree preventive tool 1 and more reliably support the tree. The bending member 40 may be a part of a frame-shaped member.

Each of the support portions 42 supports three holders 4 made of an annular body having a square shape in plan view. An auxiliary body 50 is supported on the upper portion of each holding body 4. The auxiliary body 50 is composed of a ring-shaped body having a rectangular shape in plan view, and is arranged so as to be arranged inside the holding body 4 (that is, not to protrude outside the holding body 4 in plan view). The opening area inside the ring is smaller than the opening area inside the ring of the holder 4. The auxiliary body 50 is fixed to both the support portion 42 and the holding body 4 by using a binding tool (not shown in FIGS. 9 and 10) similarly to the configuration shown in FIG. 1 and the like.

According to the fallen tree preventive tool 1 shown in FIGS. 9 and 10, by providing the auxiliary body 50 in addition to the holding body 4, the roots of the grown tree are easily entangled with the fallen tree preventive machine 1, so that the tree is more reliably supported. can do. Each of the auxiliary bodies 50 is vertically adjacent to each other, and the directions of the rectangles in a plan view are different from each other, whereby the roots of the tree can be easily supported by the upper and lower auxiliary bodies 50. As the fallen tree preventer 1 becomes larger, the number of the auxiliary bodies 50 arranged above and below the holding body 4 may be further increased to increase the density of the fallen tree preventer 1 and increase the contact area with the soil. , The effect of ground reinforcement and fallen trees can be enhanced. The auxiliary body may be a spiral one other than the annular one, and as shown in FIG. 11, the annular auxiliary body 50 and the spiral auxiliary body 52 are provided inside the holding body 4 (that is, in a plane). The fallen tree preventive tool 1 can also be configured by arranging the whole body or its main part so that it does not protrude to the outside of the holding body 4 when viewed.

The installation location of the connection structure 100 of the fallen tree preventive tool 1 is not limited to the ground at the bottom of the planting hole 12 as shown in FIG. 5, and may be the ground surface (GL line) or the like. The connection structure 100 can be used when performing ground uplifting work, river bank protection work, growing ground construction work, and the like.

When the connection structure of the fallen tree preventive tool of the present invention is embedded in the slope of the embankment, the fallen tree preventive tool 1'having the configuration shown in Fig. 12 can be preferably used. In this fallen tree preventive tool 1', two rectangular frame-shaped holding bodies 4a and 4b having different sizes are arranged in parallel with each other at a vertical interval, and the two holding bodies 4a and 4b are It is supported by the support portions 42a, 42b, 42c of the three frame-shaped members 40a, 40b, 40c orthogonal to the. Further, a triangular annular auxiliary body 44 and a rectangular annular auxiliary body 46 are inserted through the two holding bodies 4a and 4b so as to support them from the inside. The triangular annular auxiliary body 44 is formed in the shape of a right triangle and is arranged so as to be orthogonal to both the holding bodies 4a, 4b and the frame-shaped members 40a, 40b, 40c. Further, the rectangular annular auxiliary body 46 is arranged so as to be inclined with respect to the holding bodies 4a and 4b. The triangular ring-shaped auxiliary body 44 includes an insertion portion 44a that protrudes downward, and when fixing the fallen tree preventive tool 1'to the ground, insert the insertable portion 44a into the ground to change the posture of the fallen tree preventive tool 1'. By making it stable, it is possible to easily fix the pile member 20 by subsequent driving.

As shown in FIG. 13, the fallen tree preventive tool 1′ shown in FIG. 12 is a posture in which the smaller holding body 4a is in the upper position, and a plurality of spiral coupling members 8 are coupled to form a coupling structure 100′. After that, it can be fixed to the ground surface (ground) 10 by the pile member 20. When the fallen tree preventive tool 1'is embedded in the embankment 26, the holders 4a and 4b having different sizes can be arranged along the slopes of the slopes 26a and 26b of the embankment 26, respectively. The ground of the embankment 26 can be strengthened, and the fall of the trees 30 planted on the slopes 26a and 26b can be reliably prevented. In the present embodiment, the number of the holding bodies 4a and 4b provided in the fallen tree preventive tool 1'is two, but three or more holding bodies may be arranged so that the size thereof changes stepwise. When planting a coniferous tree on the slopes 26a and 26b, it is preferable to plant an evergreen broad-leaved tree below the slopes 26a and 26b. The fallen tree preventer 1'shown in FIG. 12 may be combined with the fallen tree preventer 1 shown in FIG. 1 and the like and connected by a spiral connecting member 8 to form a connecting structure 100' shown in FIG. 14, for example. it can.

Further, as shown in FIG. 15, it is also possible to construct a connecting structure 100' by stacking a plurality of fallen tree preventive tools 1 and 1'and connecting them with a connecting member 8. The connecting member 8 shown in FIG. 15 is mounted around vertical members (supporting portions) arranged in parallel so as to extend vertically in close proximity to each other, but as shown in FIG. 7 and FIG. 8 may be mounted around the portion of the holding body 4 extending in the same direction, or these may be used together.

In the connecting structure 100 ′ shown in FIG. 15, the first-stage fallen tree preventive tools 1, 1 ′ at the bottom are fixed to the ground 10 by the pile members 20. The upper end of the pile member 20 is configured to enter the inside of the second-stage fallen tree preventive tool 1, 1'. The second-stage fall prevention tools 1, 1 ′ are configured such that the lower end portions of the pile members 20 ′ that are engaged with each other enter the inside of the first-stage fall prevention devices 1, 1 ′. It is preferable that the length of the upper end or the lower end of the pile members 20, 20' to enter the inside of the fallen tree preventive tools 1, 1'is ⅔ or more of the height of the fallen tree preventive tools 1, 1'. The pile members 20, 20 ′ may be straight streak-shaped members, but the pile members 20, 20 ′ whose upper ends may be exposed to the outside are preferably curved at the upper ends.

1 Fallen tree preventive device 2 Vertical member (supporting part)
4 holding body 8 connecting member 20 pile member 30 tree 32 root 40 curving member 42 supporting portions 44, 46 auxiliary body 50, 52 auxiliary body 100 connection structure of fallen tree preventive tool

Claims (6)

A connecting structure of a plurality of fallen tree preventive devices embedded in soil so that the roots are entangled by the growth of planted trees,
Each of the fallen tree protectors includes three or more supporting portions extending in parallel to each other and an annular holding body supported by the supporting portions, and a plurality of the holding bodies are spaced along the supporting portion. Is fixed,
A connection structure of a fallen tree guard, wherein a plurality of the fallen tree guards are connected by a spiral connecting member. The connection structure for a fallen tree guard according to claim 1, wherein the plurality of the fallen tree guards are connected by mounting the connecting member around the supporting portions arranged in parallel with each other. The connection structure for a fallen tree preventer according to claim 1, wherein the plurality of the fallen tree preventers are connected by attaching the connecting member around a portion of each of the holding bodies arranged in proximity to each other and extending in the same direction. body. A method for preventing fallen trees using a plurality of fallen tree preventives embedded in the soil so that the roots are entangled by the growth of the planted tree,
Each of the fallen tree protectors includes three or more supporting portions extending in parallel to each other and an annular holding body supported by the supporting portions, and a plurality of the holding bodies are spaced along the supporting portion. Is fixed,
A connecting step in which the plurality of fallen tree preventive devices are arranged close to the ground, and are connected by a spiral connecting member,
A fixing step of fixing the fallen tree preventive tool connected to the ground by a pile member,
A method for preventing fallen trees, comprising a step of burying the fixed fallen tree preventer in soil and then planting trees in the vicinity of the fallen tree preventer. In the connecting step, the supporting portions of any one of the plurality of fallen tree preventive devices are arranged in parallel with each other in close proximity to each other, and the supporting members are advanced by advancing along the supporting portions while rotating the connecting member. The fallen tree prevention method according to claim 4, wherein the connecting member is attached around the parts. In the connecting step, the holding bodies of any one of the plurality of fallen tree preventive devices are arranged close to each other, and the connecting members are advanced along the portions extending in the same direction while rotating the connecting members. The fallen tree prevention method according to claim 4, wherein the connecting member is mounted around the holding body.