JP2009287263A - Pile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pile capable of preventing the driven pile from coming out unexpectedly or suppressing its drop out. <P>SOLUTION: This pile to be driven from a terminal toward a tip has a protruding bar formed along at least a part of a crossing line for letting a plane being vertical to the direction of driving and an outer face cross mutually. The cross section of the protruding bar when viewed in a plane being parallel with the direction of driving and passing the tip may include a vertex part, a first recessed part formed on one side of the vertex part and being a curve recessed on a pile side, and a second recessed part formed on the other side of the vertex part and being a curve recessed on the pile side. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a pile, and more specifically, the tip side is driven into the ground in order to display the boundary and position of the land (displayed by the base end side not driven into the ground) or something. The present invention relates to a pile that is used to fix the land with respect to the land, and the front end side is driven into the ground (attached directly or indirectly to the base end side that is not driven into the ground).

So far, piles have been used in various places, such as to indicate the boundary and position of land (labeling pile), to fix something on the land (fixed pile) ( For example, Patent Document 1).
The invention disclosed in Patent Literature 1 provides “a marking pile in which a display plate for identifying the marking pile can be easily attached without using a tool and can be prevented from being removed by mischief” (Patent Literature 1). In particular, paragraph No. 0005) in the detailed description of the invention, specifically, “at least the top surface is buried from the ground so as to be exposed from the ground surface, and the marking pile is identified on the top surface” An indicator pile to which a display plate for mounting is attached, the top surface having a recess for mounting the display plate, and a portion projecting toward the center of the recess at a part of the inner peripheral surface of the recess A stop claw is provided, an engagement protrusion is provided on the inner bottom surface, and the display plate is provided on the outer peripheral edge so that the display claw can be rotated below the engagement claw by allowing the engagement claw to pass vertically. Off And a fitting hole that fits into the engagement protrusion in a state where the notch of the display plate is rotated to a position deviated from the locking claw "(Patent Document 1, Claim 1) Is disclosed.

JP-A-2004-325394 (for example, paragraph numbers 0001 to 0007, 0018 to 0026, FIGS. 1 to 3 in the summary, claims, and detailed description of the invention)

Certainly, according to the marking pile disclosed in Patent Document 1, “the mounting of the display plate to the marking pile is made up and down by aligning the notch portion of the display plate with the locking claw formed on the top surface of the marking pile. Since the peripheral edge where the notch is not formed is positioned below the latching claw by passing it in the direction, placing it in the recess, and rotating the display plate, this can be done easily without using a tool. At this time, the engagement protrusion formed on the display plate is fitted to the engagement protrusion formed on the inner bottom surface of the recess, thereby preventing the engagement protrusion from rotating. It is possible to prevent the display plate from being removed from the marking pile by rotating the display plate again, returning the cutout portion to a position matching the locking claw, and passing it in the vertical direction. ”(Patent Document 1, during detailed description of the invention) Paragraph number 0007 .
However, “a resin that covers the head 10 by forming the sharpened portion 11 on the distal end side of the pile body 1 having a cross-shaped cross section, for example, and the head portion 10 having a quadrangular prism shape on the proximal end side. Or a metal cap 12 is attached ”(Patent Document 1, paragraph number 0018 in the detailed description of the invention). The marking pile is“ the top surface 12a is covered with a hammer or the like after the cap 12 is put on the head 10. “Patting and driving into the ground” (Patent Document 1, middle part of paragraph number 0022 in the detailed description of the invention) prevents or reduces the driven pile (the marking pile in Patent Document 1) from coming out of the ground. The means for this is not applied to the piles of Patent Document 1 (indicated marks in Patent Document 1). As described above, the piles that have been driven in are used to achieve the purpose of displaying the boundary and position of the land and the purpose of fixing something to the land. Can cause problems that fail to serve the important purpose of

  Then, in this invention, it aims at providing the pile which can prevent or reduce that the pile | pile piled in is accidentally removed.

The pile of the present invention (hereinafter referred to as “main pile”) is a pile driven from the proximal end toward the distal end, and at least a part of an intersection line where a plane perpendicular to the driven direction intersects the outer surface. It is a pile which has a protrusion formed along.
Since this pile has a ridge formed along at least a part of the intersection line where the plane perpendicular to the direction to be driven and the outer surface intersect, when the driven pile is to be pulled out (the direction to be driven) ), The ridge formed on the outer surface of the main pile is driven by the frictional force between the surrounding objects (the one where the main pile is driven and usually the ground where the main pile is driven). It is possible to prevent or reduce unintentional removal of the piles. In particular, the protrusion formed on the outer surface of the main pile is a direction (injected direction) substantially orthogonal to the direction of moving relative to the surrounding object (the direction opposite to the input direction) when the main pile is pulled out. Therefore, it is possible to effectively generate a frictional force that resists the pull-out of the main pile.

In this pile, the cross section of the ridge by the plane passing through the tip parallel to the driving direction is a top portion, and a first concave portion that is a concave curve formed on one side of the top portion and recessed on the pile side. , A second concave portion that is a concave curve that is formed on the other side of the top portion and that is recessed toward the pile side (hereinafter referred to as “curved ridge pile”).
Here, “curve” means that continuous differentiation is possible.
In this way, the cross section of the ridge (the cross section of the plane parallel to the direction in which the main pile is driven and passing through the tip of the main pile) is formed on the top portion and the concave portion formed on one side of the top portion and recessed on the pile side. By including a first concave portion that is a curved line and a second concave portion that is a concave curved line that is formed on the other side of the top portion and is recessed on the pile side, both sides of the top portion can be continuously differentiated smoothly. (Curve), the frictional force generated between the ridge and the surrounding object when driving the pile and the frictional force generated between the ridge and the surrounding object when the pile is pulled out When it joins, it can prevent or reduce that stress concentration arises on a protrusion, and can prevent or reduce the failure | damage etc. of this pile containing a protrusion. In addition, the concave curve is recessed on the pile side, so that when the displacement of the driven pile is small, the frictional force against the removal is not so great, but when the displacement becomes larger than a certain amount, Since the frictional force to resist suddenly increases, it can effectively resist the withdrawal of the main pile.

In the case of a curved ridge main pile, one or both of the first recess and the second recess may be part of the circumference.
The concave curve recessed on the pile side constituting the first concave portion and the second concave portion may be any smooth curve that can be continuously differentiated as described above, but is not limited at all. For example, a part of the circumference (arc), an nth order curve (where n is a natural number of 2 or more, typically a quadratic curve or a cubic curve), a part of the ellipse circumference, etc. it can. In particular, if a part of the circumference (arc) is used, it is possible to effectively prevent or reduce the occurrence of stress concentration on the ridge, and effectively prevent or reduce damage to the pile including the ridge. Can be made.

In the case of a curved ridge main pile, the first concave portion and the second concave portion may be substantially in contact with each other at the top portion.
By doing so, the apex portion can be formed in a substantially dot shape (the ridge portion corresponding to the apex portion can be formed in a substantially linear shape when viewed as a ridge, and thus the volume of the ridge can be reduced. ), The material for forming the protrusions can be reduced, and this can contribute to reduction in manufacturing cost and weight reduction of the main pile.

In this pile, the said protrusion may contain the cyclic | annular protrusion formed so that it may go around the said outer surface along the said intersection line.
The cyclic ridge is formed so as to go around the outer surface along the intersecting line where the plane perpendicular to the driving direction intersects with the outer surface of the main pile. It can be made to occur almost equally around the outer surface of the pile (the moment that the main pile tilts is difficult to occur), and the pile can be prevented from tilting even if a frictional force acting against the pull-out of the main pile acts. Can be reduced. And, instead of pulling the main pile from the tip to the base in a straight direction, a pulling force in a direction inclined with respect to the straight direction (of course, having a component force in the straight direction) was generated. In some cases, the size of the frictional force generated between the outer peripheral surface of the main pile (the position around the main pile) and the surrounding object may vary. Even in such a case, if there is a cyclic ridge, there is a high possibility that the ridge will exist at a position where the frictional force is large (the cyclic ridge formed around the outer surface is There is also a ridge at the position of.), And sufficient frictional force can be obtained against the pulling out of this pile.

This invention also provides the shaping | molding die (henceforth "this shaping | molding die") which shape | molds the shaping | molding part which is at least one part of this pile which has a protrusion among this pile.
In other words, the present forming die is a forming die for forming a forming portion which is at least a part of the pile having the ridge among the main piles, and corresponds to the forming portion formed in the inner space of the forming die. A mold main body having a take-out opening for taking out a molded portion existing in a drawing direction which is one of the base end and the tip end of the mold, and a mold lid portion for opening and closing the take-out opening to form the protrusion A secondary shape similar to the primary shape which is the shape of the cross section of the internal space by a plane perpendicular to the extraction direction passing through the recess formed on the inner surface of the mold, The secondary shape whose similarity ratio to the secondary shape is the same as the shrinkage rate of the molding material forming the molding portion is any plane perpendicular to the extraction direction in the extraction direction from the recess (from the recess The flat surface that exists between the extraction direction and the extraction opening But also encompassed by the shape of the cross section of the internal space by) a mold.
Here, the “shrinkage ratio of the molding material” means that the molding material at the molten temperature t1 injected into the inner space of the molding die is cooled and solidified, and the formed molding part is opened at the temperature t2. In the case of taking out from, the shrinkage rate Rs when the molten molding material (dimension K1) at the temperature t1 is cooled and solidified to become the solidified molding material (dimension K2) at the temperature t2 is represented by (K2 / K1).
The present mold includes a mold body having a take-out opening for taking out a formed portion, and a mold lid portion for opening and closing the take-out opening. The extraction opening of the mold body exists in the extraction direction which is one of the base end and the distal end of the main pile corresponding to the forming portion formed in the internal space of the forming die.
Then, in order to form the protrusions of the main pile, the interior by a plane perpendicular to the extraction direction passing through the recesses formed on the inner surface of the forming mold (passing the recesses and perpendicular to the extraction direction). First, consider the primary shape which is the shape of the cross section of the space. Then, consider a secondary shape similar to the primary shape. The similarity ratio between the primary shape and the secondary shape is the same as the shrinkage rate Rs of the molding material forming the molding part. By doing so, the secondary shape roughly represents the shape of the cross section by a plane perpendicular to the extraction direction of the ridge formed by the concave stripe, so that the secondary shape is more in the extraction direction than the concave stripe. The protrusions formed by the recesses are included in the shape of the cross-section of the internal space by any plane perpendicular to the extraction direction (of course, the plane from the recesses to the extraction opening). Without interfering (collision) with the inner surface of the mold (mold body), the molded part having the formed protrusion can be successfully taken out from the extraction opening.

This invention also provides the manufacturing method (henceforth "this method") which manufactures the shaping | molding part which is at least one part of this pile which has a protrusion among this pile using this shaping | molding die.
That is, this method is a manufacturing method for manufacturing a molded part, which is at least a part of the main pile having protrusions, using the main mold, and the molding material melted in the inner space of the mold. An injection step for injecting the molten material, a solidification step for cooling and solidifying the molten molding material injected in the injection step in the inner space of the mold, and forming a molded part. After the solidification step, the molded part is moved in the drawing direction. And a step of taking out the molded part from the mold through the take-out opening, and the protrusion formed on the outer surface of the molded part is contracted at the end of the solidification step when the molding material shrinks in the solidification step. In the manufacturing method, it is possible to pass through the inner space of the molding die existing in the extraction direction from the protrusion.
In the injection step of the present method, the molten molding material is injected into the inner space of the mold while the mold lid portion closes the extraction opening of the mold body.
Next, in the solidification step, the molten molding material injected in the injection step is cooled and solidified in the inner space of the molding die to form a molded portion (projections are formed corresponding to the concave stripes).
Then, after the solidification step, in the take-out step, the mold lid is moved relative to the mold body to open the take-out opening, and the molding part is moved in the extraction direction from the mold through the take-out opening. Take out the molded part.
In this method, when the molding material shrinks in the solidification step, the ridge (secondary shape) formed on the outer surface of the molded portion is removed from the ridge (secondary shape) at the end of the solidification step. Can pass through the internal space of the mold (internal space up to the extraction opening) existing in the direction (as described above, any plane (secondary shape perpendicular to the extraction direction existing in the extraction direction from the recess) ( Of course, the protrusion formed by the recess interferes with the inner surface of the mold (die body) by being included in the shape of the cross-section of the internal space by the plane from the recess to the extraction opening). No collision).
As described above, according to the present method, a molded part having a protrusion can be manufactured smoothly and effectively using the main mold.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited by these.

1 is a front view of a pile (main pile) 11 of the present invention, FIG. 2 is an enlarged view in a circle A in FIG. 1, and FIG. 3 is an enlarged view in a circle B in FIG. 4 is a partially enlarged view showing a state in which a cap portion 21 (described later) is removed from a portion indicated by an arrow C in FIG. 1, FIG. 5 is a sectional view taken along line DD in FIG. 1, and FIG. 1 is an EE sectional view of FIG. 1, FIG. 7 is an end view of FF of FIG. 1, FIG. 8 is a sectional view of GG of FIG. 1, and FIG. It is an expanded sectional view which shows a detailed shape (QQ cross section of FIG. 2 is shown). The main pile 11 will be described with reference to FIGS. 1 to 9.
The main pile 11 roughly includes a cap portion 21 and a fitting portion 31d (see particularly FIGS. 4, 7 and 8) on the base end 11b side to which the cap portion 21 is fitted. And a main body 31 having a sharp tip portion 31a on the tip 11a side as a tip when the main pile 11 is driven into the soil (not shown).

  The main body 31 is a straight rod-like shape (straight line L (straight line L) from the proximal end 11b side to the distal end 11a side) along the straight line L (virtual straight line, and no specific wire or the like exists). The cross-sectional shape by a plane perpendicular to the straight line L is a “+” shape (as shown in FIG. 5 and FIG. 6). A core portion 31b1 having a substantially square cross-sectional shape, and a protruding portion 31b2 formed so as to protrude from each of the four sides of the substantially square shape and having a cross-sectional shape perpendicular to the straight line L. , 31b3, 31b4, 31b5 to form a “+” shape, in order to facilitate understanding, the boundary between the core portion 31b1 and the protruding portions 31b2, 31b3, 31b4, 31b5 is shown in FIG. And indicated by a dotted line in FIG. The center portion 31b, a sharp tip portion 31a integrally formed on the tip end 11a side of the center portion 31b (constricted toward the tip end 11a), the base end 11b side of the center portion 31b, and the fitting portion 31d The connecting part 31c to be connected and the fitting part 31d formed integrally with the connecting part 31c so as to protrude in a direction parallel to the straight line L are provided. The main body 31 is made of a resin material (specifically, polyethylene, polypropylene, or the like that is recycled). Here, a mixture of 70% polyethylene (weight percentage) and 30% polypropylene (weight percentage) is used as waste plastic. ).

  The cap part 21 is fitted from the base end 11b side of the fitting part 31d. Specifically, since the fitting portion 31d has a substantially rectangular parallelepiped shape having four surfaces 31dp substantially parallel to the straight line L, the substantially rectangular parallelepiped formed by the fitting portion 31d is viewed from the base end 11b side. The cap portion 21 forms a hollow, substantially rectangular parallelepiped shape with one surface that can be internally fitted open. As shown in FIGS. 7 and 8, the inner surface of the cap portion 21 is formed so as to be in close contact with the four surfaces 31dp of the substantially rectangular parallelepiped formed by the fitting portion 31d. The cap portion 21 is also made of a resin material (specifically, polyethylene, polypropylene, etc. that are recycled). Here, a mixture of polyethylene 70% (weight percentage) and polypropylene 30% (weight percentage) is used as waste plastic. )).

In the main body 31, a hollow portion 35 (hollow) having an opening 35a is formed on the base end 11b side of the main body 31 (fitting portion 31d). The hollow portion 35 has a substantially (rectangular) truncated cone shape, and the bottom surface (opening 35a) of two portions formed by cutting a right cone with the straight line L as an axis along a plane parallel to the bottom surface. And a portion including (forms (right) truncated cone).
The opening 35a of the hollow portion 35 is closed by the cap portion 21 that is fitted to the fitting portion 31d.
The hollow portion 35 is the center of gravity position of the outer shape of the main pile 11 (indicated by the center of gravity Z in FIG. 1. The center of gravity Z is when the mass is uniformly distributed to a solid having the outer shape of the main pile 11. It is formed on the base end 11b side than the center of gravity.

  The main body 31 includes a portion 31ba near the distal end 11a of the central portion 31b, a portion 31bb near the proximal end 11b of the central portion 31b, and a portion near the proximal end 11b of the distal end portion 31a. A plurality of protrusions 41 are formed along a line where a perpendicular plane and the outer surface of the main body 31 intersect. Specifically, here, six protrusions 41 (substantially equidistant along the straight line L direction) are formed on a portion 31ba of the central portion 31b near the distal end 11a, and the proximal portion 11b of the central portion 31b is closer to the proximal end 11b. Twelve ridges 41 (substantially equidistant along the straight line L direction) are formed on the portion 31bb, and four ridges 41 (substantially equidistant along the straight line L direction) are formed near the base end 11b of the distal end portion 31a. However, the tip end portion 31a has a conical side surface portion 31ac along a right conical side surface whose apex is directed to the tip end 11a, and any of the four protrusions 41 is divided by the conical side surface portion 31ac. )) Is formed. The six ridges 41 formed on the portion 31ba of the central portion 31b near the distal end 11a and the twelve ridges 41 formed on the portion 31bb of the central portion 31b near the proximal end 11b are both body portions. 31 is formed so as to go around the outer surface of the projecting portions 31b2, 31b3, 31b4, 31b5 forming the central portion 31b (see particularly FIGS. 5 and 6), but the base end 11b of the distal end portion 31a. All of the four ridges 41 formed in the close portion are divided into four portions by the conical side surface portion 31ac.

These ridges 41 have the same cross-sectional shape perpendicular to the continuous direction of the ridges 41 (for example, the MM cross section in FIG. 2 and the NN cross section in FIG. 3). Yes. FIG. 9 is a cross-sectional view showing a cross section perpendicular to the continuous direction of the ridge 41 (specifically, a QQ cross section of FIG. 2), and a cross-sectional shape of the ridge 41 with reference to FIG. 9. Will be described.
The cross-sectional shape perpendicular to the continuous direction of the ridge 41 is substantially symmetric with respect to a plane Pt perpendicular to the straight line L passing through the top portion 42 (the highest portion), and a part of the arc having a radius rt (center angle) A first arc portion 43 formed by an angle of about 90 degrees (recessed when viewed from the outer surface side of the main pile 11, in other words, recessed toward the main pile 11 side), and a part of an arc having a radius rt. A second arc portion 44 formed by (a central angle of about 90 degrees) (recessed when viewed from the outer surface side of the main pile 11, in other words, recessed toward the main pile 11 side). It is configured. The top portion 42 is formed by one end of the first arc portion 43 and one end of the second arc portion 44 being substantially in contact with each other, and the other end of the first arc portion 43 is connected to one edge of the protrusion 41 in the straight line L direction. And the other end of the second arc portion 44 forms the other edge of the protrusion 41 in the straight line L direction (the first arc on the portion 39 of the outer surface of the main pile 11 where the protrusion 41 is not formed). The other end of the portion 43 is substantially in contact with the other end of the second arc portion 44). Here, the radius rt is about 0.7 mm.

Next, a method for manufacturing the main pile 11 will be described.
FIG. 10 is a cross-sectional view (showing a cross section cut by a plane including the straight line L) of the forming die 51 for forming the main body 31 of the main pile 11, and FIG. 11 is a portion R1 in FIG. FIG. 12 is a partially enlarged cross-sectional view of (a part indicated by an arrow R1), and FIG. 12 is a partial enlarged cross-sectional view of a R2 part (a part indicated by an arrow R2) in FIG. The mold 51 will be described with reference to FIGS.
The mold 51 roughly includes a mold body 53 having an internal space 61 that substantially corresponds to the shapes of the tip portion 31a, the center portion 31b, and the connecting portion 31c, and an internal space that substantially corresponds to the shape of the fitting portion 31d. A mold base end portion 55 having 63, and a protruding rod 57 that can be moved into and out of the internal space 61 of the mold main body portion 53. The mold base end portion 55 has a core portion 55c for forming the hollow portion 35 and is movable in a direction substantially parallel to the straight line L (the moving direction is indicated by an arrow S2. The straight line L and the arrow S2 10 is closed, and the base end side opening 53b of the mold main body 53 is closed in a state of being pressed against the mold main body 53 as shown in FIG. 10 (the mold base end 55 is shown in FIG. 10). As shown, when the proximal end opening 53b of the mold main body 53 is pressed against the mold main body 53, the internal space 61 and the internal space 63 together form an internal space corresponding to the shape of the main body 31. (Hereafter, sometimes referred to as “total internal space”).) The protruding rod 57 is fitted in the mold main body 53 so as to be slidable in a direction substantially parallel to the straight line L (the sliding direction is indicated by an arrow S1. The straight line L and the arrow S1 are parallel). As will be described later, the tip 57a of the protruding rod 57 comes into contact with the tip 11a of the main body 31 formed by injecting molten resin material from the resin inlet 59 into the total internal space and cooling and solidifying. After the melted resin material is cooled and solidified in the general internal space to form the main body 31, the mold base end 55 is moved away from the mold main body 53 and the base end opening 53b is opened. In the state where the distal end 57a of the projecting rod 57 is in contact with the distal end 11a of the main body 31 of the internal space 61, the projecting rod 57 is slid in the direction of the proximal end 11b, thereby opening the formed main body 31 to the proximal end side. 53b (details will be described later).

On the other hand, on the inner surface of the molding die 51, a concave stripe 65 that forms the protrusion 41 is formed at a position corresponding to the protrusion 41 (see particularly FIGS. 11 and 12).
When the melted resin material is injected into the total internal space from the resin inlet 59, the melted resin material fills the recess 65, but shows the same recess 65 as the recess 65 shown in FIG. As shown in FIG. 5, the melted resin material contracts when cooled and solidified in the internal space 61, so that the gap between the protrusion 41 formed and the inner surface 53 p of the mold 51 (mold body 53). A gap 71 is formed, and the formed main body 31 can be slid (in the direction of arrow V in FIG. 13) and extracted from the proximal end opening 53b.
The dimensional relationship between the recess 65 of the mold 51 and the protrusion 41 formed by the recess 65 will be described in detail below. FIG. 14 is a partially omitted enlarged view of a portion J (a portion surrounded by a dotted rectangle) in FIG. First, when the molten resin material is injected into the internal space 61, the molten resin material (temperature t 1, about 250 ° C. here) fills the recess 65. Thereafter, when the resin material filling the recess 65 is cooled and solidified, the resin material contracts to form the main body portion 31 (temperature t2, here approximately 50 ° C.). At this time, the shrinkage rate Rs (= K2 / K1, here about 0.97) when the molten resin material (dimension K1) at the temperature t1 is cooled and solidified to become the solidified resin material (dimension K2) at the temperature t2 is here. Is less than 1 (Rs (about 0.97 here) <1. That is, it shrinks by cooling and solidification), so the outer surface of the solidified body portion 31 and the molding die 51 (mold body portion 53). A gap 71 is formed between the inner surface 53p. Then, the dimension X2 (specifically, X2 = 47.4 mm here) corresponding to the top portion 42 (the highest portion) of the protrusion 41 formed by the recess 65, and the formed main body. A dimension X1 (specifically here) of the inner surface 53p of the molding die 51 (mold body 53) in the direction in which the portion 31 is extracted (the direction of the arrow V in this case) (the portion where the top portion 42 of the protrusion 41 needs to pass). X1 = 46.0 mm), and the value obtained by multiplying X2 by Rs is less than X1 (X1 <(X2 × Rs)). Since the relationship between X1 and X2 is satisfied in any of the protrusions 41 formed on the main body 31, the protrusion 41 interferes with the inner surface 53p of the forming die 51 (die main body 53). The formed main body 31 can be taken out from the proximal end opening 53b without causing a collision.

FIG. 15 is a conceptual diagram illustrating a process of molding the main body 31 of the main pile 11 using a molding die 51 (including a mold main body 53, a mold base end 55, and a protruding rod 57). With reference to FIG. 15, the molding process of the main body 31 will be described.
First, as shown in FIG. 15A, a mold body 53 having a hollow internal space 61 is prepared. In (a), the protruding rod 57 is in a position retracted from the internal space 61 (in the state shown in FIG. 10), and the main body 31 is formed by injecting molten resin material into the total internal space and cooling and solidifying. At a position where the tip end 57a of the protruding rod 57 contacts the tip end 11a. At this time, the base end side opening 53b of the mold main body 53 is opened.
Second, as shown in FIG. 15B, the mold base end 55 is pressed against the mold main body 53 (the state shown in FIG. 10; the mold base end 55 is moved in the direction of the arrow S2. The base end side opening 53b of the mold main body 53 is closed. In such a state, the core portion 55 c is located at a position corresponding to the hollow portion 35.
Third, as shown in FIG. 15B, the state in which the mold base end 55 is pressed against the mold main body 53 (the base end opening 53b of the mold main body 53 is closed) is maintained. The molten resin material 58 is poured from the resin inlet 59 into the total internal space. Thereafter, the resin material 58 injected into the total internal space is cooled and solidified, and when the solidification of the resin material 58 is completed, the mold base end 55 is removed from the mold main body 53 (the mold base end 55 is removed in the direction of arrow S2). Away from the mold body 53). Thereby, the base end side opening 53b of the mold main body 53 is opened (at the same time, the core portion 55c is extracted from the cavity portion 35).
Fourth, as shown in FIG. 15 (c), the protruding rod 57 whose tip 57a is in contact with the tip 11a of the main body portion 31 formed in the internal space 61 is arranged along the arrow S1 direction. By pushing into the space 61 (sliding leftward in FIG. 15), the formed main body 31 is taken out from the base end side opening 53b.
Fifth, by pulling out the protruding rod 57 from the internal space 61 along the arrow S1 direction (sliding to the right in FIG. 15), the state returns to the state in FIG.
Each of (a) → (b) → (c) → (a) → (b) → (c) → (a) → (b) → (c)... In FIG. By performing the process, the main body 31 can be continuously formed and manufactured. In addition, the main body part 31 manufactured in this way is fitted with the cap part 21 manufactured separately in the fitting part 31d, and the main pile 11 is completed.

As described above, the main pile 11 has the center-of-gravity position of the outer shape (indicated by the center of gravity Z in FIG. 1. The center of gravity Z is when the mass is uniformly distributed to the solid having the outer shape of the main pile 11. Is a pile (in this case, a boundary pile for indicating a land boundary or the like), which is provided with a hollow portion 35 formed on the base end 11b side than the base end 11b toward the front end 11a. ). Compared to the state in which the hollow portion 35 is not formed, the main pile 11 has the hollow portion 35 on the base end 11b side with respect to the center of gravity position Z of the outer shape. The actual gravity center position of the main pile 11 when the hollow portion 35 is formed is indicated by the gravity center Y in FIG. Therefore, when the main pile 11 is driven from the base end 11b toward the front end 11a (the front end 11a is positioned below), the center of gravity is located closer to the front end (downward) than the conventional pile, and thus the main pile 11 is driven. It is possible to prevent or reduce the falling down. In addition, the main pile 11 can be reduced in weight by the hollow portion 35.
And this pile 11 has the cap part 21 which forms the said base end 11b, the main-body part 31 which has the fitting part 31d by which the cap part 21 is fitted by the said base end 11b side, and has the cavity part 35, The hollow portion 35 has an opening 35a in the fitting portion 31d, and the opening 35a is closed by the cap portion 21 fitted in the fitting portion 31d. Thus, if the cap part 21 is removed from the fitting part 31d, the opening 35a of the cavity part 35 is exposed to the outside, and if the cap part 21 is fitted to the fitting part 31d, the opening 35a of the cavity part 35 is closed. Therefore, the hollow portion 35 can be used for various purposes. For example, the hollow portion 35 can be used to accommodate any object (for example, a sign indicating the location information of the place where the main pile 11 is installed, a sign indicating the manager of the main pile 11, etc.). The opening 35a is formed at the base end of the fitting portion 31d.
In this pile 11, the integral core member (core part 55c) which has the shape corresponding to the cavity part 35 inserted by the cavity part 35 can be extracted from the cavity part 35 via the said opening 35a. It is. The hollow portion 35 includes a cone (here, a right cone having the straight line L as an axis) having the opening 35a as a bottom surface, and an apex of the cone (a straight cone having the straight line L as an axis) and the bottom surface (opening 35a). Of the two parts (here, the truncated cone and the cone) generated by cutting by a plane existing between them (here, a plane parallel to the bottom surface (opening 35a)), the part including the bottom surface (opening 35a) (( It is an abbreviation for the shape of (right) truncated cone).

  Further, the forming die 51 is a forming die for forming the main body portion 31 constituting the main pile 11, and is a die cover portion (die base end) having the core member (core portion 55 c) forming the hollow portion 35. Part 55) and a mold main body (mold main body part 53) whose extraction opening (base end side opening 53b) is closed by a mold lid part (mold base end part 55), and a mold lid part (mold base end part) 55) is an internal space (an internal space 61 and an internal space 63 corresponding to the shape of the main body 31 in a closed state in which the extraction opening (base end side opening 53b) of the mold main body (the mold main body 53) is closed. It is a mold for forming a total internal space formed together. In such a mold 51, the core member (core portion 55c) is attached to the mold lid portion (mold base end portion 55), and in a closed state, a position where the hollow portion 35 of the internal space is to be formed. However, after the molten molding material (molten resin material 58) is injected into the internal space and cooled and solidified, the molded body portion 31 is taken out from the extraction opening (base end side opening 53b). When the (die base end 55) is moved relative to the die body to open the take-out opening (base end opening 53b), the core member (core portion 55c) is simultaneously extracted from the cavity portion 35. Thus, the opening and closing of the mold lid (mold base end 55) and the extraction of the core member (core section 55c) can be performed in one stroke, and the main body 31 can be molded efficiently.

  And the process of shape | molding the main-body part 31 of the main pile 11 mentioned above using the shaping | molding die 51 is a manufacturing method which manufactures the main-body part 31 which comprises the main pile 11 using the shaping | molding die 51, Comprising: The said closed state (In the state where the mold lid part (mold base end part 55) closes the take-out opening (base end side opening 53b) of the mold body (mold body part 53)), the internal space (the internal space 61 and the internal space 63 of the mold 51). Injection step of injecting a molten molding material (molten resin material 58) into a total internal space formed together, and molding the molten molding material injected in the injection step (molten resin material 58) A solidification step in which the main body 31 is formed by cooling and solidification in the internal space (total internal space) of the mold 51, and after the solidification step, the mold lid (mold base end 55) is attached to the mold main body (mold main body 53). Moved relative to The core member (core portion 55c) is extracted from the cavity portion 35, and the opening opening step for opening the extraction opening (base end side opening 53b), and the main body portion from the opened extraction opening (base end side opening 53b). A take-out step of taking out 31.

Moreover, this pile 11 is a pile driven toward the front end 11a from the base end 11b, Comprising: A plane perpendicular | vertical with respect to the direction (here parallel to the straight line L) (here perpendicular | vertical to the straight line L) A pile (in this case, a boundary pile for indicating a boundary of land, etc.) having a ridge 41 formed along at least a part of a line of intersection between the plane and the outer surface. By having such a protrusion 41, when the driven main pile 11 is going to come off (the direction opposite to the driven direction), the protrusion 41 formed on the outer surface of the main pile 11 is a surrounding object (main pile). 11 is driven, and a frictional force is usually generated between the pile 11 and the main pile 11 that has been driven, and the driven pile 11 can be prevented or reduced from being unexpectedly removed.
And in this pile 11, the cross section (for example, cross section shown in FIG. 9) of the protrusion 41 by the plane which passes along the said front-end | tip 11a parallel to the direction (here parallel to the straight line L) is driven. A first concave portion (first arc portion 43) which is a concave curve (continuous differentiation is possible) formed on one side of the top portion 42 and recessed on the pile (main pile 11) side, and the other of the top portion 42 2nd recessed part (2nd circular arc part 44) which is a concave curve (continuous differentiation possible) which is formed in the side and is depressed in the pile (main pile 11) side. In this way, both sides of the top portion 42 are formed by smooth continuously differentiable lines (curves), so that when the main pile 11 is driven, the frictional force generated between the ridge 41 and the surrounding object or the main pile When the frictional force generated between the protrusion 41 and the surrounding object is applied to the protrusion 41 when the protrusion 11 is pulled out, it is possible to prevent or reduce stress concentration on the protrusion 41, It is possible to prevent or reduce breakage of the main pile 11 that is included. In the pile 11, one or both of the first recess (first arc portion 43) and the second recess (second arc portion 44) (here, both) are part of the circumference (part of the arc having the radius rt). (Center angle of about 90 degrees)), it is possible to effectively prevent or reduce stress concentration on the ridge 41, and effectively prevent breakage of the main pile 11 including the ridge 41 or the like. Can be reduced. Moreover, in this pile 11, since the 1st recessed part (1st circular arc part 43) and the 2nd recessed part (2nd circular arc part 44) contact | abut in the top part 42, the top part 42 is made substantially dot-like. It can be formed (the volume of the protrusion 41 can be reduced), the material for forming the protrusion 41 can be reduced, and this contributes to a reduction in manufacturing cost and weight reduction of the main pile 11. it can.
In the main pile 11, the protrusion 41 intersects the intersecting line (the direction in which the main pile 11 is driven (the direction along the straight line L) and the outer surface intersect with the plane perpendicular to the straight line L). A circular ridge formed so as to go around the outer surface along the line of intersection). Here, the circulating ridges are six ridges 41 formed on the portion 31ba of the center portion 31b near the tip 11a and twelve ridges formed on the portion 31bb of the center portion 31b near the base end 11b. (These 18 ridges 41 are formed so as to go around the outer surface of the main body 31 (projections 31b2, 31b3, 31b4, 31b5 forming the central portion 31b)). . With this cyclic ridge, it is possible to cause the frictional force against the pull-out of the main pile 11 to be generated substantially equally around the outer surface of the main pile 11 (the moment that the main pile 11 tilts is not easily generated). Even if a frictional force that resists the slipping out of 11 acts, this pile 11 can be prevented or reduced from tilting.

Further, the forming die 51 is a forming die 51 for forming a forming portion (here, the main body portion 31) which is at least a part of the pile 11 having the protrusions 41 in the main pile 11. Either of the base end 11b and the tip end 11a of the pile 11 corresponding to a molding portion (main body portion 31) formed in a space (an integrated internal space formed by the internal space 61 and the internal space 63 together) On the other hand (in this case, the base end 11b), the extraction opening (base) is located in the extraction direction (in the direction of arrow V in FIG. 13, which is substantially parallel to the straight line L). A die main body (mold main body portion 53) having an end side opening 53b) and a mold lid portion (mold base end portion 55) for opening and closing the take-out opening (base end side opening 53b). In order to do this, the recess formed on the inner surface 53p of the mold 51 The internal space (the internal space 61 and the internal space 63 are formed together by a plane perpendicular to the extraction direction passing through 5 (in the direction of arrow V in FIG. 13, which is substantially parallel to the straight line L). It is a secondary shape similar to the primary shape (the portion having the dimension X2 in FIG. 14) which is the cross-sectional shape of the overall internal space), and the similarity ratio between the primary shape and the secondary shape is the molded portion (main body The secondary shape, which is the same as the shrinkage rate of the molding material (resin material 58) forming the portion 31), is extracted from the concave strip 65 (in the direction of arrow V in FIG. 13). (Of course, it exists in the portion up to the extraction opening (base end side opening 53b)) which is perpendicular to the extraction direction (in the direction of arrow V in FIG. 13, which is substantially parallel to the straight line L). Plane (an example of this plane has dimension X1 in FIG. Min) are those in which the internal space (internal space 61 and the internal space 63 is also included in the cross-sectional shape of the overall internal space) which forms together by a mold. Here, “the shrinkage ratio of the molding material (resin material 58)” is the molten molding material (resin that is injected into the internal space (the total internal space formed by the internal space 61 and the internal space 63 together). When the material 58) (temperature t1 at the time of injection) is cooled and solidified, and the formed main body 31 is extracted from the extraction opening (base end side opening 53b) at the temperature t2, the molding material (resin material) at the temperature t1 is melted. 58) Assuming that (dimension K1) is cooled and solidified to become a solidified molding material (resin material 58) (dimension K2) at temperature t2, the shrinkage rate Rs = (K2 / K1).
By doing so, the secondary shape roughly represents the shape of the cross section of the plane perpendicular to the extraction direction of the protrusion 41 formed by the recess 65, so that the secondary shape is more than the recess 65. Also included in the shape of the cross section of the internal space by any plane perpendicular to the extraction direction existing in the extraction direction (of course, the plane from the recess 65 to the extraction opening (base end side opening 53b)), The protrusion 41 formed by the recess 65 does not interfere (collises) with the inner surface 53p of the forming die 51 (die main body (die main body portion 53)). 31) can be successfully extracted from the extraction opening (base end side opening 53b).

  And the process of shape | molding the main-body part 31 of the main pile 11 mentioned above using the shaping | molding die 51 is a shaping | molding part (main-body part 31) which is at least one part of the main pile 11 which has the protrusion 41 among the main piles 11. FIG. Is a molding material (resin material 58) that is melted in the internal space of the mold 51 (the total internal space formed by the internal space 61 and the internal space 63 together). ), And the molten molding material (resin material 58) injected in the injection step is cooled and solidified in the internal space (total internal space) of the mold 51 to form a molded portion (main body portion 31). After the solidification step and the solidification step, the molding portion (main body portion 31) is moved in the extraction direction (in the direction of arrow V in FIG. 13, which is substantially parallel to the straight line L), and the extraction opening (base end side opening) 53b And taking out the molding part (main body part 31) from the molding die 51 via the step, and the molding material (resin material 58) contracts in the solidification step, so that the molding part (main body part 31) The protrusion 41 formed on the outer surface exists in the extraction direction (in the direction of arrow V in FIG. 13, which is substantially parallel to the straight line L) than the protrusion 41 at the end of the solidification step (of course, extraction) This is a manufacturing method that can pass through the internal space (total internal space) of the mold 51 (located in the portion up to the opening (base end side opening 53b)).

It is a front view of the pile (main pile) of the present invention. It is an enlarged view in the circle A of FIG. It is an enlarged view in the circle B of FIG. It is the elements on larger scale which show the state which removed the cap part from the part which the arrow C of FIG. 1 points out. It is DD sectional drawing of FIG. It is EE sectional drawing of FIG. FIG. 5 is an end view of FF in FIG. 1. It is GG sectional drawing of FIG. It is an expanded sectional view which shows the detailed shape of a protrusion. It is sectional drawing which shows the shaping | molding die for forming a main-body part. It is a partial expanded sectional view of R1 part of FIG. It is a partial expanded sectional view of R2 part of FIG. It is a partial cross section figure which shows the state of the protrusion formed and a shaping | molding die (die main-body part) inner surface. FIG. 14 is a partially omitted enlarged view of a portion J in FIG. 13. It is a conceptual diagram explaining the process of shape | molding a main-body part using a shaping | molding die.

Explanation of symbols

11 piles 11a distal end 11b base end 21 cap part 31 main body part 31a distal end part 31ac conical side part 31b central part 31b1 core part 31b2, 31b3, 31b4, 31b5 projecting part 31ba, 31bb part 31c connecting part 31d fitting part 31d Cavity 35a Opening 39 Projection not formed 41 Projection 42 Top portion 43 First arc portion 44 Second arc portion 51 Mold 53 Mold body 53b Base end opening 53p Inner surface 55 Base 55 Child part 57 Protruding rod 57a Tip 58 Resin material 59 Resin inlet 61 Internal space 63 Internal space 65 Concave strip 71 Gap

Claims (7)

A pile driven from the proximal end toward the distal end,
A pile having a ridge formed along at least a part of an intersecting line where a plane perpendicular to the driving direction intersects an outer surface.     The cross-section of the ridge by a plane passing through the tip parallel to the driving direction is a top portion, a first recess that is a concave curve formed on one side of the top portion and recessed on the pile side, and the other of the top portion The pile according to claim 1, comprising a second concave portion that is a concave curve that is formed on the side and is recessed on the pile side.     The pile according to claim 2, wherein one or both of the first recess and the second recess is a part of a circumference.     The pile according to claim 2 or 3, wherein the first concave portion and the second concave portion are substantially in contact with each other at the top portion.     The pile according to any one of claims 1 to 4, wherein the protrusion includes a circular protrusion formed so as to go around the outer surface along the intersecting line. Among the piles according to any one of claims 1 to 5, a molding die for molding a molded part that is at least a part of a pile having a protrusion,
A mold main body having a take-out opening for taking out the formed part in the drawing direction corresponding to one of the base end and the tip end of the pile corresponding to the formed part formed in the internal space of the forming mold; A mold lid for opening and closing,
A secondary shape similar to the primary shape which is the shape of the cross section of the internal space by a plane perpendicular to the extraction direction passing through the recess formed on the inner surface of the mold for forming the protrusion. Any plane in which the secondary shape whose similarity ratio between the primary shape and the secondary shape is the same as the shrinkage rate of the molding material forming the molding portion is perpendicular to the extraction direction in the extraction direction rather than the concave strip A molding die that is also included in the shape of the cross section of the internal space. It is a manufacturing method which manufactures the forming part which is at least one part of the pile which has a ridge among the piles of any one of Claims 1 thru / or 5, using the forming die according to claim 6,
An injection step of injecting a molten molding material into the interior space of the mold;
A solidification step in which the molten molding material injected in the injection step is cooled and solidified in the inner space of the mold to form a molded part;
After the solidifying step, the molding part is moved in the extraction direction, and the molding part is removed from the molding die via the extraction opening,
When the molding material shrinks in the solidification step, the ridge formed on the outer surface of the molded part can pass through the inner space of the mold located in the extraction direction from the ridge at the end of the solidification step. A manufacturing method.

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