JP2011097899A - Mulching sheet pressor pile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide mulching sheet pressor piles which keep good the covering effect of soil by greatly increasing the pulling resistance from the soil surface without unnecessarily expanding the holes of the piles pierced in the mulching sheet. <P>SOLUTION: The pressor pile 10 includes a leg 3, which pierces the soil surface, in the lower part of the head 2 which presses down the mulching sheet. The leg 3 comprises the spearhead-shaped cylindrical core component 3M and the spring plate components 3S and 3S, the latter of which extend across from the tip to the joint part on both sides of the core component 3M. In the normal time when no load is applied to the leg 3, the spring plate components 3S and 3S develop to curve outward in a line in the right and left respectively. When more than the predetermined load is applied to the right and left of the leg 3 toward inside, the spring plate components 3S and 3S change to a superpositional state of pressing to curve inward in a line in the right and left respectively. In the released time when the load to the right and left of the leg 3 toward inside is removed, the spring plate components 3S and 3S return to the original developed state from the superpositional state by their restoring force. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a multi-sheet presser pile, and more particularly to a retaining structure for the presser pile.

  Multi-sheet is known as a kind of agricultural material. The multi-sheet is made of, for example, a black or white resin film material, and is used by covering the soil surface to suppress weeds, adjust the ground temperature, or the like.

  Conventionally, a dedicated presser pile (also referred to as “multipresser”) is used to fix such a multisheet to the soil surface. The structure of the presser pile is, for example, provided with a club-shaped leg portion below the plate-shaped head. The leg portion extends from the vicinity of the center of the head downward so as to be T-shaped when viewed from the front.

When the multi-sheet is put on the soil surface and the pressing pile is driven, the legs of the pressing pile penetrate the multi-sheet and pierce the soil surface, and the head presses the multi-sheet. Multi-sheets are stably held on the soil surface by driving the holding piles at an appropriate interval.
In addition, the following patent documents 1 and 2 are well-known as a prior art regarding the multi-sheet holding pile.

JP-A-6-245655 Japanese Utility Model Publication No. 6-86442

  However, such conventional multi-sheet presser piles often have insufficient pull-out resistance from the soil surface. For this reason, when the multi-sheet is blown in the wind, there arises a problem that the holding pile is easily pulled out from the soil surface. When the presser pile is removed at one place, wind pressure is further applied to the sheet surface of the part that has been removed, and the other presser piles may come off in a chain.

  On the other hand, although the holding pile which provided the return | turnback in the right-and-left side of a leg part and was made to raise pull-out resistance is known (refer patent document 1), said problem is not fully solved, but more The present situation is that a highly reliable holding pile is required.

  In order to ensure sufficient resistance to pulling out, it may be possible to increase the number of turns or increase the length, but with such measures, the pierced holes that occur in the multi-sheet will expand more than necessary, and soil There is also a risk that the surface covering effect may be impaired.

  The present invention has been made in view of such a current situation, it is possible to greatly improve the resistance to pulling out from the soil surface, and without expanding the piercing holes generated in the multi-sheet more than necessary, the soil surface An object of the present invention is to provide a multi-sheet presser pile that can maintain a good covering effect.

[First invention]
The multi-sheet presser pile according to the first aspect of the present invention for solving the above-mentioned problems adopts the following configuration.
That is, a holding pile including a head for holding the multi-sheet and a leg portion extending below the head and penetrating the multi-sheet to pierce the soil surface,
The legs are
A rod-like core extending below the head;
From both side positions of the tip of the core material to both side positions of the base part, and having a pair of spring plate members that span the space on the left and right sides of the core material,
In a normal state where no load is applied to the legs, the pair of spring plate members are in a deployed state in which they are curved and connected so as to bulge outwardly on the left and right sides, respectively.
At the time of pressurization in which a load of a predetermined value or more is applied to the left and right inward of the leg portion, the pair of spring plate materials are switched from a deployed state to a superposed state in which they are curved and continuous so as to swell inward on the left and right sides, respectively.
When the left and right inward loads are removed from the legs, the pair of spring plate members are configured to return from the superimposed state to the original deployed state by the restoring force.

When using the holding pile, first, the tip of the core material pierces the multi-sheet, and then the left and right spring plate materials pass through the piercing holes and enter the ground. At this time, the spring plate material is in a normally deployed state, and receives a load inward from the left and right from the edge of the piercing hole.
When the core material enters further deeper, the load received by the spring plate material from the edge of the piercing hole gradually increases as it approaches the part farthest from the core material in the curved shape of the spring plate material. Switch from the unfolded state to the superimposed state instantly.
When the part of the spring plate that is farthest from the core material passes through the piercing hole, the load that the spring plate material receives from the edge of the piercing hole is reduced thereafter. Return to.

  According to the structure of this invention, the spring board material which penetrated the multi sheet | seat is maintained in the expansion | deployment state in soil. For this reason, the soil enters the space between the core material and the spring plate material, and adjusts to the surrounding soil and hardens. Thereby, a spring board material penetrates into the soil around a core material firmly, and improves the extraction resistance from the soil surface significantly.

In addition, when driving the holding pile into the multi-sheet, the spring plate material is switched from the normal deployed state to the superimposed state at the time of pressurization, and is passed through the pierced hole in the superimposed state. The farthest part is closer to the left and right inside than normal, and the width of the entire leg is kept small.
As a result, the spring plate material does not unnecessarily enlarge the piercing hole of the multi-sheet, and the multi-sheet covering effect can be kept good.

[Second invention]
The multi-sheet presser pile according to the second aspect of the present invention has the structure of the first aspect of the present invention, and is configured such that the side surfaces of the pair of spring plate members are each provided with a barb that protrudes left and right.

According to such a configuration, in addition to the spring plate material, the left and right outward turns act as resistance in the soil. Thereby, the pulling-out resistance from the soil surface of a pressing pile can further be raised.
Moreover, since the return is provided on the side surface of the spring plate material, the distance from the core material is changed in the same manner when the return is followed by the unfolded state and the superimposed state of the spring plate material. Thereby, it becomes difficult to return from the puncture hole in the unfolded state, and it is possible to enjoy both the effects that the piercing hole easily enters in the superimposed state.

[First invention and second invention]
The presser pile of the present invention is preferably used in the soil of a vegetable field or fruit tree field, but the use of the soil is not limited as long as it is used for fixing a multi-sheet.
The multi-sheet is preferably made of, for example, a film made of polyvinyl chloride, and can be applied to a black or white multi-sheet as well as a silver or transparent multi-sheet.
In consideration of the environment after use, it is also possible to employ biodegradable plastics for the materials of the multi-sheet and the holding pile.
In addition, it is of course possible to apply other inventions described in the specification to the first invention and the second invention.

It is a perspective view which shows the pressing pile of the multi sheet | seat of 1st Embodiment. The same holding pile is shown, (A) is a front view, (B) is a side view. The same holding pile is shown, (A) is a plan view, and (B) is a bottom view. It is the IV-IV line end view shown in FIG. It is the VV line end view shown in FIG. It is a schematic diagram for demonstrating the expansion | deployment state and superimposition state of the spring board material of the pressing pile. It is effect | action explanatory drawing which shows the state in the middle of piercing the same pressing pile in the soil surface through a multi sheet | seat. It is effect | action explanatory drawing which shows the state after piercing the same pressing pile in the soil surface through a multi sheet | seat. The multi-sheet holding pile of 2nd Embodiment is shown, (A) is a front view, (B) is a side view. The multi-sheet holding pile of 3rd Embodiment is shown, (A) is a front view, (B) is a side view.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The perspective view of the holding pile of 1st Embodiment was shown in FIG. As shown in FIG. 1, the holding pile 10 includes a head 2 that holds the multi-sheet and a leg 3 that pierces the multi-sheet. Legs 3 extend downward from the center of the strip-shaped head 2.
The plate width of the head 2 is, for example, about 2 to 3 cm, and the length is about 10 to 12 cm. The width of the leg 3 is, for example, about 2 to 4 cm, and the length is about 10 to 15 cm. When the presser pile 10 is viewed from the front, the head 2 and the leg 3 are formed in a T shape.

  The head 2 is oval when viewed from above and extends with a constant width in the left-right direction (see FIG. 3A). The plate surface of the head 2 is slightly inclined downward from the center to the outside (see FIG. 2A). On the lower side of the head 2, reinforcing ribs 7 connected to both side root portions of the leg 3 are provided.

The leg portion 3 is composed of a rod-shaped core member 3M and spring plate members 3S, 3S on the left and right sides thereof. It is spanned across the space H from the both side positions of the tip 3a of the core material 3M to the both side positions of the base 3b.
When viewed from the side, the spring plate materials 3S, 3S have a larger plate width than the core material 3M, and the core material 3M is hidden by the spring plate (see FIG. 2B). The distal end portions of the spring plate members 3S, 3S are tapered and continue to the distal end portion of the core member 3M.

On the side surfaces of the spring plate members 3S, 3S, a plurality of barbs 5 protrude toward the left and right outer sides. Each of the barbs 5 is arranged symmetrically in the left-right direction with four equal spacings in the length direction of the spring plate members 3S, 3S (see FIG. 2A).
The barb 5 includes a horizontal plate 5a and a vertical plate 5b (see FIG. 2B). The horizontal plate 5a is slightly inclined upward and serves as a resistance when being pulled out. The vertical plate 5b extends substantially vertically downward from the center of the horizontal plate 5a and serves to reinforce the horizontal plate 5a.

The schematic diagram which looked at the holding pile from the front in FIG. 6 was shown.
During normal times when no load is applied to the legs 3, the spring plate members 3S, 3S are kept in a deployed state curved so as to swell outward in the left and right directions as indicated by solid lines. In other words, the spring plate members 3S, 3S are arranged so as to be once separated from the core member 3M and then approached as they go from the tip toward the base side.

  When an inward load as shown by the arrows in FIG. 6 is applied to the left and right sides of the leg portion 3, the spring plate members 3S and 3S are switched to a superposed state curved so as to bulge inwardly on the left and right sides as indicated by a two-dot chain line. This switching does not occur until the left and right loads reach the default value, but occurs instantaneously when the default value is reached. When the load exceeds a predetermined value, the central portion of the spring plate members 3S, 3S comes into contact with the core member 3M and is kept in a substantially stationary state as it is.

  The default value may be set to an appropriate value in consideration of the material and thickness of the multi-sheet. When the multi-sheet is relatively flexible and easy to pierce, the default value is set small. If the soil is relatively hard, set a large default value. In any case, when the presser pile 10 is driven into the multi-sheet, the portion 3St farthest from the core material 3M out of the curved shape of the spring plate materials 3S, 3S changes from the deployed state to the superimposed state before reaching the puncture hole. It is necessary to set so that the changeover occurs.

7 and 8 schematically show how the pressing pile 10 is driven into the soil surface through a multi-sheet.
When the presser pile 10 is used, first, the tip of the core material 3M is stabbed into the multi-sheet 15, and then the left and right core materials 3M pass through the stab holes and enter the ground. At this time, the spring plate members 3S, 3S are in a normally unfolded state and receive a load inward from the left and right from the edge of the piercing hole 15p.

  When the core material 3M enters further deeper, the load that the spring plate materials 3S, 3S receive from the edge of the piercing hole 15p gradually increases as the portion 3St farthest from the core material 3M in the curved shape of the spring plate materials 3S, 3S approaches. When the predetermined value is exceeded, as shown in FIG. 7, the unfolded state is instantaneously switched to the superimposed state.

  When the portion 3St farthest from the core material 3M of the spring plate materials 3S, 3S passes through the piercing hole 15p, the load received by the spring plate materials 3S, 3S from the edge of the piercing hole 15p becomes small, and when it falls below a predetermined value, The spring plate materials 3S, 3S return from the superimposed state to the original deployed state (see FIG. 8).

  As described above, according to the presser pile of the first embodiment, the spring plate members 3S, 3S penetrating the multi-sheet 15 are maintained in the expanded state in the soil. For this reason, the soil enters the space H between the core material 3M and the spring plate materials 3S, 3S, and becomes familiar with the surrounding soil and hardens. Thereby, the spring plate materials 3S and 3S can penetrate into the soil around the core material 3M firmly, and the pull-out resistance from the soil surface can be greatly improved.

Further, when the presser pile 10 is driven, the spring plate materials 3S, 3S are switched from the normal deployed state to the superimposed state at the time of pressurization, and are passed through the piercing hole 15p of the multi-sheet 15 in the superimposed state. Of the 3S curved shape, the portion 3St farthest from the core material 3M is closer to the left and right inner sides than usual, and the lateral width of the entire leg portion 3 is kept small.
As a result, the spring plate materials 3S and 3S do not expand the piercing hole 15p more than necessary, and the covering effect of the multi-sheet 15 can be kept good.

As mentioned above, although the pressing pile of 1st Embodiment was demonstrated, embodiment of this invention may be accompanied by various deformation | transformation, without being limited to these.
For example, as shown in 2nd Embodiment (pressing pile 20) of FIG. 9, it is good also as a structure which remove | eliminated the return 5 from the side surface of the spring board materials 3S and 3S. In this case, since the lateral width of the leg portion 3 is reduced, the multi-sheet piercing hole can be further reduced, and the covering effect can be further improved.

Moreover, as shown in 3rd Embodiment (pressing pile 30) of FIG. 10, you may make it provide the return 5F in the site | part most distant from the core material 3M of the spring board materials 3S and 3S. In the return 5F, the side end surface of the vertical plate 5b is connected to the tapered inclined surface of the spring plate members 3S and 3S. When viewed from the front, the tip of the leg portion 3 looks like an arrow.
According to such a configuration, the pull-out resistance can be further increased by the return 5F. In addition, since the return 5F is easily caught on the edge of the stab hole, there is no fear that the presser pile 30 will come off from the multi-sheet.

In the first to third embodiments, the shape of the head 2 is formed to be oval when viewed from above, but it may be changed to a shape such as a circle, an ellipse, a rectangle, or a polygon. Good. The head 2 may be formed into a three-dimensional shape and the multi-sheet may be pressed.
The shapes of the core member 3M, the spring plate members 3S and 3S, and the barb 5 can be freely changed within a range that does not impair the operation and effect of the present invention.

2 Head 3 Leg 3a Tip 3b Base 3M Core 3S, 3S Spring Plate 5 Return 5F Return 7 Rib 10 Holding Pile (First Embodiment)
15 Multi-sheet 15p Piercing hole 20 Holding pile (2nd Embodiment)
30 retaining pile (third embodiment)
H space

Claims (2)

A presser pile comprising a head that holds the multi-sheet and a leg that extends below the head and penetrates the multi-sheet and pierces the soil surface,
The legs are
A rod-like core extending below the head;
From both side positions of the tip of the core material to both side positions of the base part, and having a pair of spring plate members that span the space on the left and right sides of the core material,
In a normal state where no load is applied to the legs, the pair of spring plate members are in a deployed state in which they are curved and connected so as to bulge outwardly on the left and right sides, respectively.
At the time of pressurization in which a load of a predetermined value or more is applied to the left and right inward of the leg portion, the pair of spring plate materials are switched from a deployed state to a superposed state in which they are curved and continuous so as to swell inward on the left and right sides, respectively.
A multi-seat presser pile, wherein the pair of spring plate members are configured to return from the superimposed state to the original deployed state by the restoring force when the leg portion is released from the left and right inward loads.   The multi-sheet presser pile according to claim 1, wherein the side surfaces of the pair of spring plate members are each provided with a barb that protrudes left and right.

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