JP6576088B2 - Foundation pile - Google Patents

Description

  The present invention relates to a foundation pile driven into the ground in order to support and fix a relatively light workpiece or the like, and more specifically, on a ground (ground), for example, a stand (frame) for installing a solar panel. Body) and a foundation pile that is driven and buried in the ground (in the soil) to support and fix these mounts and the like when a workpiece such as a small lightweight house is installed on the ground.

  This type of foundation pile (hereinafter also referred to simply as “pile”) is usually made of a metal straight pipe (the cross section is the same before and after), and has a pedestal (frame) at or near the top (pile head). An attachment means for supporting, fixing (attaching) and the like is provided, and the lower end (the tip of the pile body) is appropriately sharpened or tapered. These are friction piles that are to be constructed by driving into the ground (or press-fitting. Hereinafter, simply referred to as driving) and are supported by the frictional force and earth pressure with the surrounding ground. Since the construction method is also simple, it is often used to support and fix relatively lightweight workpieces. On the other hand, such foundation piles (hereinafter referred to as simple piles) have a simple structure, so depending on the weight applied to them, they can easily settle (sink) and easily fall out. The problem is that the settling property or pull-out resistance (strength or anchoring action against pull-out force) is low and the fixing force is weak. Especially for foundation piles that support installations that are inclined with respect to the ground, such as solar panels, depending on the wind direction, the settling (sinking) force or pulling out depends on the wind direction. Since force is always applied, there is a difficulty in fixing force on soft ground.

  Instead of such a simple pile, a screw-like one called a spiral pile, in which a spiral is provided on the outer peripheral surface of a pipe (circular pipe), is also used (see, for example, Patent Document 1 and FIG. 1). Since this has a screw structure and is pressed into the ground while rotating, it is superior in terms of sedimentation resistance and pull-out resistance after embedding compared to simple piles, but it is pressed while rotating. Therefore, there is a difficulty in that a special dedicated machine (heavy machine) is required.

  Under these circumstances, special special machines (heavy machinery) are not required, and, just like conventional foundation piles, after press-fitting (or driving in), the bolts are tightened with a wrench to improve sedimentation resistance and pull-out resistance. There is also a foundation pile made to be made (for example, Patent Document 2). After driving, this foundation pile compresses the pipe wall deforming member provided with a predetermined structure in the pipe-like pile main body up and down by rotating the bolt provided in the main body with a screwing tool. The first stage of deformation, in which the pipe wall forming the pile body is pushed outward from the inside by using the deformation, and the deformation of the pipe wall deforming member is started after the first stage of deformation is started. Without deforming, only the pipe wall of the pile body is deformed outward so that a second-stage deformation that increases the deformation relatively easily can be obtained. In this foundation pile (two-stage compression deformation type foundation pile), the pipe wall in the soil can be gradually deformed outwards, so depending on the ground strength, settling resistance and pullout resistance Is increased.

JP 2007-205108 A Japanese Patent No. 5637285

  The above-mentioned two-stage compression deformation type foundation pile does not require a special dedicated machine (heavy machine) as compared with its construction method, and after driving, it can withstand only by bolting with a wrench, which is a general-purpose tool. Although there is a merit that the settling property and the pull-out resistance can be improved, there is a problem that the configuration is complicated. Specifically, the foundation pile of this two-stage compression deformation system is provided with bolt insertion members in the pile body in the top and bottom, and the bolts are passed between the two members, and compressed vertically between the two members. A pipe wall deforming member that can be deformed to push the pipe wall outward is disposed, while the first nut that does not rotate among the bolts between the pipe wall deforming member and the lower bolt insertion member. A member is screwed, and a similar second nut member is also screwed to a lower screw portion of the lower bolt insertion member. Such a configuration is based on the idea that it is difficult to directly spread the pipe wall of the pile body against the earth pressure by the vertical compression force by the rotation of the bolt. That is, with this configuration, after driving in, the bolt is turned to compress and deform the pipe wall deforming member between the first nut member and the upper bolt insertion member, and the pipe wall is moved outwardly using the deformation. One step of spreading and deforming into a buckling shape. Next, the second stage deformation to the outside is performed by directly rotating the pipe wall where the buckling-shaped deformation has been started up and down between the second nut member and the upper bolt insertion member by turning the bolt. Is to be obtained. According to such a two-stage compression deformation method, although a large deformation can be obtained according to the ground strength, there is a problem that the structure is complicated.

  The present invention has been made in view of such problems, and can be embedded by simply driving in without being complicated, and can be embedded by simply driving in, and after that, a wrench can be used. It is an object of the present invention to provide a foundation pile that is simple and excellent in sedimentation resistance and pull-out resistance by using a general-purpose tool.

The present invention according to claim 1 is a foundation pile integrally including a tapered portion formed into a tapered pipe shape from the tip of a pipe-shaped pile main body portion having a constant transverse cross section to the front,
A rear end side member is provided in the pile main body portion and behind the front end of the pile main body portion, and in the tapered portion and ahead of the front end of the pile main body portion or on the front end of the tapered portion. While having a member,
When the front end side member and the rear end side member are compressed between the front and rear, and the space between the front and rear is reduced, a wall that forms the tapered portion and the pile main body portion between the front and rear is a foundation pile. The wall forming the tapered portion and the pile main body portion between the front and rear sides is provided with an easy-to-deform means so as to project outward or to be deformed in a state of being divided in the circumferential direction of itself. And
The front end side member and the rear end side member are coupled with a screw structure that can reduce the space between the front and rear by screw tightening with a tool inserted from the rear opening into the pile main body, and the screw An interval holding member having a predetermined front and rear length is provided between the front and rear ends of the front end side member and the rear end side member so that the interval does not become smaller than a predetermined dimension after the interval is reduced by tightening. It is characterized by being.

In the present invention according to claim 2, while the rear end side member is provided with a through hole through which a shaft portion of a bolt with a head can be inserted and the head can be locked, The tip side member is provided with a female screw into which a male screw provided at the tip of the bolt shaft or a portion near the tip is screwed.
The shaft of the bolt is inserted into the through hole, the male screw is screwed into the female screw, and the front end side member and the rear end side member are connected by a screw structure by this screwing. It is a foundation pile of Claim 1 characterized by the above-mentioned.

  According to a third aspect of the present invention, the front end side member is provided with a bolt having a shaft portion extending rearward, and the rear end side member has a shaft portion of the bolt. A through-hole through which a rear end or a portion near the rear end can be inserted is provided, and a rear end or a portion near the rear end of the shaft portion is inserted through the through-hole to protrude rearward, and protrudes rearward. A nut that can be locked in the through hole is screwed to a male screw provided at a rear end or a portion near the rear end of the shaft portion, and the front end side member and the rear end are screwed by a screw structure by this screwing. The end pile member is connected to the foundation pile according to claim 1.

The present invention according to claim 4 is characterized in that the interval between the front and rear is reduced by the screw tightening, and when the interval reaches a predetermined amount, the rotation in the screw tightening is idle. The screw length is a predetermined length, and an outer diameter of a predetermined length portion of the shaft portion connected to the male screw is equal to or less than a diameter of a valley of the male screw. It is a foundation pile given in any 1 paragraph of 2 or 3.
The present invention described in claim 5 is characterized in that the spacing member is a hollow member formed by allowing the shaft portion of the bolt to pass through the hollow portion of the space holding member in a gap-fitted state. It is a foundation pile of any one of.

The present invention according to claim 6 is characterized in that the easy-to-deform means includes the taper portion and the pile main body portion between the front and rear sides at intervals in the circumferential direction in the cross section of the pile main body portion and the tapered portion. The foundation pile according to any one of claims 1 to 5, wherein the foundation pile is provided so as to be connected to a wall formed vertically.
According to a seventh aspect of the present invention, the pile main body portion has a square pipe structure with a constant cross section before and after, the tapered portion is a pyramid or pyramid with the tip of the square pipe as a base end. It is formed in the pipe structure of the stand,
The said easy-to-deform means is provided in the corner of the wall which makes the said taper part and the said pile main-body part between the said front and back, or it is provided in a row near the corner. The foundation pile according to item 1.
In the present invention according to claim 8, apart from the easily deformable means provided continuously in the vertical direction, the easily deformable means includes a boundary portion between the pile main body portion and the tapered portion, between the front and rear. 8. The device according to claim 6, wherein at least one of the three portions, ie, the portion closer to the front end side member and the portion closer to the rear end side member, is provided so as to extend in the lateral direction. It is a foundation pile according to item 1.

  Since the foundation pile according to the first aspect of the present invention has the above-described configuration, it can be embedded in the ground by driving in the same manner as a conventional simple pile made of pipe. Then, after the driving, the space between the front and rear can be reduced by tightening with an inserted tool (for example, a screwing tool such as an electric impact wrench) from the opening above the pile main body. In the state where the walls forming the tapered portion and the pile main body portion between the front and rear portions are divided in the circumferential direction of the foundation pile itself, the deformation in the form of projecting or overhanging is obtained. As described above, the foundation pile of the present invention does not cause any special or complicated structure as is clear from the configuration. And since the above-mentioned deformation | transformation is obtained by screwing after driving | running, it can be set as the foundation pile which is excellent in sedimentation resistance and pull-out resistance by simple operation | work. In addition, what is necessary is just to use a suitable tool for the tool used for screw fastening according to screw structure (a kind of screw | thread, a mechanism).

  That is, in the present invention, since the tip of the boundary portion (the tip of the pile main body) between the pile main body portion and the tapered portion forms the tapered portion, the taper between the front and rear before the deformation is made. The wall which forms a part and the said pile main-body part is a thing which bent the boundary site | part as a bending point or a bending site | part, when this is a longitudinal cross-sectional view of a foundation pile. For this reason, in the foundation pile of the present invention, the above-mentioned screw between the front-rear side of the front-end side member and the rear-end-side member, which is disposed so as to straddle the boundary portion, that is, the bending point (or the bending portion). By compressing to be reduced by tightening, from the beginning, the boundary part is the bending point, and the wall protrudes outward or is easily deformed in a protruding form. Since a separate configuration for facilitating deformation, such as a pipe wall deforming member, is not required unlike a deformation-type foundation pile, the structure is not complicated. Moreover, in the present invention, when the front end side member and the rear end side member are compressed between the front and rear, and the distance between the front and rear is reduced, the tapered portion and the pile main body portion between the front and rear are The wall between the front and rear sides is provided with an easy-to-transform means so that the wall formed is divided in the circumferential direction of the foundation pile itself and protrudes outward or deforms so as to project outward (overhang deformation). It has been. For this reason, in the present invention, without complicating the structure, and after being driven, only by tightening the screw with an appropriate torque, the projecting deformation to the outside of the wall between the front and rear can be obtained. . The easy deformation means will be described later.

  That is, unlike the present invention, in the portion of the straight pipe (pipe structure) that does not have the bending point (or bending portion) as described above, for example, the front and rear (longitudinal) breaks at intervals in the circumferential direction of the pipe. Even if easy-to-deform means such as a slit and a slit are provided, it is usually necessary to compress the wall to project it outward or to deform it in a protruding manner. Because of the pressure, it is virtually impossible. For this reason, in order to obtain such deformation, a pipe wall deformation member that can separately apply an external force that pushes the pipe wall outward (laterally outward), such as the above-described two-stage compression deformation foundation pile It is necessary to provide the mechanism and structure in a pipe or the like, and thus the structure is complicated. On the other hand, according to the foundation pile of the present invention, there is no such problem, and the deformation can be obtained only by compression between the front and rear by screw tightening. In the present invention, the term “pipe” or “pipe shape” is not limited to a pipe (tube or cylinder) having a structure that allows liquid to pass outside without leakage, but to the wall (peripheral wall). Any pipe-shaped (hollow) structure (hollow member) may be used as long as it can be a foundation pile, such as a pipe-shaped structure having a cut or a through hole.

  Furthermore, in this invention, since it has the structure containing the said space | interval holding member, the remarkable effect that the following subjects can be solved is acquired. In the construction of the foundation pile having the configuration of the present invention, by tightening the screw, the space between the front and rear is reduced, so that an overhanging deformation to the outside of the wall is obtained, thereby improving the settling resistance and the pullout resistance. It is done. On the other hand, in order to facilitate this screwing operation, it is preferable that the strength of the deformed wall is low. However, without having a configuration including the spacing member, if the thickness of the wall is reduced or the strength is low, the foundation pile after the screw tightening, that is, after the completion of construction, Some sedimentation may occur. The cause is as follows. When an excessive weight (compression load) is applied to the upper part of the foundation pile after construction, it protrudes to the outside in the lower ground, or overhangs the deformed wall via the pile body part above it That weight will take. Thereby, when the overhanging wall cannot resist the weight, it is deformed so as to be crushed downward. That is, the pile main body portion sinks due to the crushed deformation. This is the cause of the foundation pile sinking.

  On the other hand, in the present invention, after the distance between the front and rear is reduced by screw tightening, an interval holding member having a predetermined front and rear length is provided between the front and rear so that the distance does not become smaller than a predetermined dimension. Therefore, since it becomes a support column, the above-described problem can be solved even when an excessive weight is applied as described above. In order to solve these problems, after the foundation pile is driven and screwed, a cement or mortar or other solidifying agent is poured into the foundation pile as a slurry and consolidated at the overhanging deformation site. Is also possible. However, when this is done, when the foundation pile is later pulled out and discarded, it is not easy to dispose of the waste material, for example, because it is necessary to separate the caking agent from the foundation pile (metal). On the other hand, the present invention does not have such a problem.

  The interval holding member in the present invention may be any member that can prevent the interval from becoming smaller than a predetermined dimension after the interval is reduced by screw tightening. Therefore, the shape and structure of the member are not limited as long as the member can be provided (incorporated) between the front end side member and the rear end side member. The interval holding member itself has an appropriate compressive strength between the front and rear and may be set in consideration of ease of assembly in the foundation pile. In the present invention, “after the interval is reduced by screw tightening, the interval does not become smaller than a predetermined dimension” because the interval itself reduced by screw tightening does not become smaller than that. This means that even if the interval reduced by screw tightening may be reduced (or allowed) by a set (or permitted) predetermined dimension, it will be smaller than the predetermined dimension after the decrease. It means not to be small.

  In the present invention of claim 1, the screw structure for connecting the front end side member and the rear end side member is the configuration according to claim 2 or 3 in that the structure of the foundation pile is simplified. Therefore, it is preferable. In the invention according to claim 2, a screwing tool (for example, a box wrench having a long shaft (handle)) having a fitting portion to be fitted to the head portion of the bolt is inserted from the opening at the rear end of the pile body portion. Then, it may be fitted to the head of the bolt and tightened with a wrench such as an electric impact wrench. In the present invention, the “head-equipped bolt” is not limited to a bolt having a head (hexagonal portion) at the end of the shaft portion like a normal hexagonal bolt, for example, and a screw tightening tool is fitted therein. A bolt (male screw member) provided with a portion at the end of the shaft portion or in the middle may be used. Moreover, in the invention of Claim 3, what is necessary is just to use the screwing tool which has a fitting part which can be screwed by rotating a nut.

  And in invention of Claim 2 or 3, like this invention of Claim 4, when the space | interval between the said front and back becomes small by the said screw fastening, and this space | interval becomes predetermined amount. The screw length of the male screw is set to a predetermined length so that the rotation in the screw tightening is idle, and the outer diameter of the predetermined length portion of the shaft portion connected to the male screw is the male screw. It is better to be less than or equal to the diameter of the valley. In this invention of Claim 4, when the space | interval between the said front and rear becomes small by the said screw fastening, when this space | interval becomes predetermined amount, the rotation in the screw fastening will be idling. As a result, the screw tightening operator can easily know from the occurrence of the idling that the predetermined deformation amount to be deformed can be secured, so that the overhanging deformation by the operator is appropriate and stable. Construction is secured. For this reason, what is necessary is just to set the male screw length etc. so that moderate deformation | transformation may be obtained. Note that the length of the shaft portion whose outer diameter is equal to or less than the diameter of the valley of the male screw may be set as a length necessary for idling after the screwing with the female screw is released. But the bolt used in the invention of Claim 2 or 3 may use the full screw volt | bolt in which the external thread is formed over the full length of the axial part. In this case, the interval that is reduced by screw tightening may be the front-rear length of the interval holding member. That is, the front end side member and the rear end side member may be set to be screwed until they are regulated by the respective front and rear ends of the spacing member (the range in which the screw can be tightened). If it does in this way, since the space | interval made small by screw fastening is decided by stopping with the said space | interval holding member, it will not become smaller than it. In addition, in the case where the idle rotation is obtained after the screw tightening as in the present invention described in claim 4, for example, when the spacing member is assumed that the rear end is in contact with the rear end side member, An appropriate gap (gap) K necessary for idling is required between the tip and the tip side member. And the magnitude | size of such a space | gap (gap | interval) is set in consideration of existence of the dimension error etc. on the assembly of a foundation pile. On the other hand, the presence of such voids causes the above-mentioned crushing deformation after screw tightening or sedimentation of the foundation pile, even if it is slight. For this reason, in order to reduce crushing deformation or sedimentation of the foundation pile, it is preferable to set the front and rear length (height) of the spacing member so that the gap (gap) required for idling is as small as possible. .

  The interval holding member in the present invention may be any member as long as the interval can be prevented from becoming smaller than a predetermined dimension after the interval is reduced by screw tightening, and the shape and structure of the member are not limited. In the case of using the bolt as in the invention described in Items 2 to 4, it is preferable to use a hollow member as in the invention described in Claim 5 so that the bolt penetrates the hollow portion. This is because the hollow member forming the spacing member can be stabilized. The hollow member may be selected from hollow shaft members such as a strong metal pipe (cylindrical tube) that can maintain the spacing at a predetermined size or can be crushed and prevented from being deformed. And the length should just be set according to the predetermined dimension by which the said space | interval should be hold | maintained.

  The arrangement and shape of the easy-to-transform means provided on the front and rear walls may be set as appropriate depending on the cross-sectional shape of the pipe and the like, and are not particularly limited. Moreover, the said deformation | transformation easy means has a cut | interruption (slit), a hole to penetrate, a notch, a groove | channel, a thin part, etc., It is good also as a combination of at least any one of those, or those 1 or more. And the deformation | transformation easy means in this invention can drive this into the ground, without deforming easily at the time of driving a foundation pile, and, when making it deform | transform after that, according to the softness of a ground, intensity | strength, etc. Thus, the deformation described above against the earth pressure in the ground may be set so as to be obtained with an appropriate screw tightening torque. That is, since the easy deformation means is a strength reducing means for obtaining the above deformation, it may be set according to the material of the pipe constituting the foundation pile, the cross-sectional size, the strength of the pipe such as the wall thickness, etc. .

  And in order to make a wall into the state divided | segmented in the circumferential direction of foundation pile itself among the said deformation | transformation easy means, it is good to provide a deformation | transformation easy means like this invention of Claim 6. As described above, this easy-to-deform means may use a cut (slit), a through-hole, a notch, a groove or a thin-walled portion, but as a cut or slit, it is divided from the beginning in the circumferential direction. In addition, it is preferable that the cuts or slits that are divided are connected vertically. As in the seventh aspect of the present invention, a pipe having a square pipe structure (for example, a general-purpose square steel pipe (a square pipe having a substantially square cross section (equal side)). It is preferable that the easy-to-transform means is provided continuously in the upper and lower corners in the corners (corner portions) of the walls (square pipes) of these cross sections or in the vicinity of the corners. In the present application, a pyramid, a truncated pyramid, or a square does not refer to those in a mathematical (graphic) sense, but generally refers to them in the meaning used in a structure.

  In the present invention, the square pipe is made of a steel pipe (for example, a general structural square steel pipe), or the whole or a part thereof, for example, by welding from a belt-like plate material (or plate material) such as flat steel. Also included are those formed. However, in order to obtain the deformation more easily, the deformation easy means extends in the lateral direction in at least one of the respective portions as in the present invention described in claim 8. Although it is good to provide, it is preferably three sites. By providing in this way, the boundary between the front and rear sides of the front and rear walls is formed outside in the form of sandwiching the boundary portion in the front and rear direction due to the stress concentration generated in various places of the easy-to-deform means provided to extend in the lateral direction. Deformation that protrudes or overhangs, that is, deformation that becomes a bend such as, for example, a “ku” shape in which the convex portion faces outward is easily obtained. Note that, as the easily deformable means extending in the lateral direction, cuts or slits are particularly effective as the strength reducing means, but stress may be easily concentrated as grooves.

  The foundation pile of the present invention is usually a metal pipe including the pile main body, and as a typical example, it is preferable in terms of cost to use a thin-walled square pipe (general structural square steel pipe) having an equal cross section. However, the material may be appropriately selected according to strength and corrosion resistance, such as aluminum or an aluminum alloy. However, the foundation pile of the present invention, or the pile main body forming the same, is not limited to the material, and may be assembled or manufactured into a pipe structure from a plate material by welding or the like. ) And a pipe such as a general structural square steel pipe may be used as described above.

BRIEF DESCRIPTION OF THE DRAWINGS The front view (elevation figure) of Embodiment 1 (1st Example) which actualized the foundation pile of this invention, and the enlarged vertical half sectional view of the principal part. The enlarged view of the P1 part of FIG. The cross-sectional view in each position of the front-rear direction of FIG. FIG. 3 is an enlarged longitudinal sectional view of a main part for explaining an example of assembling (assembling) a main part in the foundation pile of FIG. 1. 1A is an enlarged vertical half sectional view of the main part for explaining the middle of the deformation of the foundation pile shown in FIG. 1 after being driven into the ground, and B is after the deformation of rotating the bolt until it is idle. The expanded vertical half sectional view of the principal part explaining A. The figure which looked at B of FIG. 5 from the front end side. The left half section is a figure explaining the effect of the space | interval holding member in Example 1, Comprising: The figure when a right half cross section does not have a space | interval holding member. The expanded vertical half sectional view of the principal part at the time of completion | finish of screw fastening (after deformation | transformation) explaining the modification of the foundation pile (1st Example) of FIG. The expanded vertical half sectional view of the principal part of 2nd Example which actualized the foundation pile of this invention. The expanded vertical half sectional view of the principal part of 3rd Example which actualized the foundation pile of this invention. 10A is an enlarged vertical half sectional view of the main part for explaining the middle of the deformation of the foundation pile shown in FIG. 10 after being driven into the ground, and FIG. The expanded vertical half sectional view of the principal part explaining A. The expanded vertical half sectional view of the principal part of 4th Example which actualized the foundation pile of this invention.

  Embodiment 1 (1st Example) which actualized the foundation pile which concerns on this invention is demonstrated referring FIGS. 1-6. The foundation pile 100 of the present example is based on the tip 23 at the tip (lower end in the drawing) 23 of the pipe-shaped pile main body portion 20 having a constant cross section (horizontal cross section, a substantially square square) at the front and rear (upper and lower sides in the drawing). A tapered portion 30 integrally formed in the shape of a quadrangular pyramid and a tapered pipe is integrally provided at the end (lower side in the drawing) as an end, and both are made of steel. And the rear end side member (plate | board material) 40 formed in the pile main-body part 20, Comprising: A predetermined amount back (upward illustration) from the front-end | tip 23 is formed so that the cross section may be crossed without protruding outside. It has. In this example, the rear end side member 40 is welded along the outer periphery of the wall (flat plate portion) 25 of the pipe-shaped pile main body 20. That is, in this example, the rear end side member 40 is disposed near the tip of the pile main body portion 20, and has a configuration in which the pile main body portion 20 is welded so as to abut the front end of the rear end side member 40. is doing. And the head 53 of the bolt (for example, hexagon bolt) 50 with a head is latched in the position corresponded to the center of the pile main-body part (pipe) 20 among this rear end side member 40, and bolt A through-hole (circular hole) 43 that penetrates the shaft portion 54 is provided in order to allow the 50 shaft portions 54 to pass therethrough.

  On the other hand, within the tapered portion 30, a predetermined amount ahead of the tip 23 of the pile main body portion 20 (downward in the figure, intermediate between the front and rear of the tapered portion 30) is to cross the transverse section without protruding outward. A formed distal end side member (plate material) 60 is provided. The distal end side member 60 is welded along the outer periphery of the wall 35 of the tapered portion (pipe-like structure) 30 that is tapered with a quadrangular pyramid. However, a through hole (circular hole) 63 through which the shaft portion 54 of the bolt 50 can be inserted is provided at a position corresponding to the center of the tapered portion (quadrangular pyramid pipe) 30 in the distal end side member 60. A nut (female threaded member) 65 is welded to the front-facing surface (downward surface) for screwing a male screw 57 provided on the tip side of the shaft portion 54 of the bolt 50. In this example, the nut 65 is also welded. Including the tip-side member 60. Note that a screw hole (female screw) into which the male screw 57 is screwed may be formed directly on the distal end side member 60 itself.

  Moreover, in this example, it is a metal straight so that it may become concentric with the center in the center position of the pile main-body part (pipe) 20 among the front direction surfaces (downward surface) 45 of the above-mentioned rear end side member 40. A hollow member (also referred to as a cylindrical tube) 70 made of a simple cylindrical tube is provided in a hanging shape (substantially perpendicular to the front-facing surface 45) to form a spacing member. The hollow member (cylindrical tube) 70 has an inner diameter that is large enough to allow the shaft portion 54 of the bolt 50 to be inserted, and is welded to the forward facing surface 45 of the rear end side member 40 at the upper end (the upper end in FIGS. 1 and 2). ing. However, in this welding, as will be described later, for example, the shaft portion 54 of the bolt 50 is passed through the through hole (circular hole) 43 of the rear end side member 40 and also passed through the cylindrical tube 70 to be connected to the front end side member 60. It is sufficient to hold the assembly process until the nut 65 is screwed into the female thread of the nut 65, and therefore, it is so-called temporary fixing welding (temporary welding) for assembling. The inner diameter of the hollow member (cylindrical tube) 70 (inner diameter of the hollow portion) is substantially the same as the inner diameter of the through hole (circular hole) 43 in this example, and does not hinder the rotation (screw tightening) of the bolt 50. The size is assumed. The front-rear length of the cylindrical tube 70 is such that the predetermined distance between the front-rear side member 60 and the rear-end side member 40 is a predetermined dimension by completing the predetermined screw tightening with the bolt 50 after the foundation pile 100 is driven. However, the length may be such that there is no gap between the distal end 75 of the cylindrical tube 70 and the rearward facing surface (upward surface) 67 of the distal end side member 60. In this example, as shown in the right diagram of FIG. 5, the length is such that a moderate (for example, 1 mm to 5 mm) minute gap K is held.

  Such a foundation pile 100 of this example is a single pipe structure comprising a pipe-like pile main body portion 20 having a constant cross section and a tapered portion 30 formed in a tapered pipe shape at the tip (lower end) 23 thereof. However, a portion of the tapered portion 30 that is rearward of the front end side member 60 and a portion of the pile main body portion 20 that is ahead of the rear end side member 40 are integrated as one after the other. It is configured. And the site | part behind the rear-end side member 40 consists of what cut | disconnected the square steel pipe for general structures to the appropriate dimension in this example. For this reason, the assembly of the main part of the foundation pile 100 of this example is made as follows (see FIG. 4). As shown in the left diagram of FIG. 4, a portion of the tapered portion 30 in FIGS. 1 and 3 that is behind the front end side member 60 and a portion of the pile main body portion 20 that is ahead of the rear end side member 40. The front end side member 60 is assigned to the front end of the part 21 integrated with the front and rear, the rear end side member 40 is assigned to the rear end, and the front end side member 60 and the rear end side member 40 21 is integrated by welding or the like so as to sandwich it later. However, the cylindrical pipe (straight pipe) 70 is welded to the forward face 45 of the rear end side member 40 in a substantially vertical manner as described above. Then, the shaft portion 54 of the bolt 50 is passed through the through hole 43 of the rear end side member 40 from behind, and the inside of the cylindrical tube 70 is passed, and the male screw 57 on the distal end side of the shaft portion 54 is connected to the nut 65 in the distal end side member 60. These members 40 and 60 are connected with bolts 50. Then, the pile main body part 20 which consists of the said steel pipe behind it is abutted and welded to the rear-end side member 40, and the front-end | tip side member 60 contains the pointed point part of the taper part 30 (cap-shaped part) 37) butted at the rear end and welded. By doing so, it is assembled as shown in the right figure of FIG. As can be understood from this assembly, the cylindrical tube 70 is welded to the forward-facing surface 45 of the rear end side member 40 because it is easy to pass the bolt 50 that connects both the members 40 and 60. Thereafter, the welding may be separated.

  As described above, in the foundation pile 100 of this example, the hexagon bolt 50 is attached to the through hole 43 provided in the rear end side member 40 and the cylindrical pipe (straight pipe) 70 provided in the forward facing surface 45 from the rear. The shaft portion 54 is inserted, and a male screw 57 provided at the tip or near the tip of the shaft portion 54 has a screw structure that is screwed into a nut (female screw) 65 that forms the tip-side member 60. The two members 40 and 60 are connected together. Further, in this example, a washer (washer, slip washer) 59 is interposed between the rear end side member 40 and the head 53 of the hexagon bolt 50, and in this state, the hexagon bolt 50 is rotated so as to be screwed, and at least the screw is brought into an appropriate screwed state so as not to be removed from the screwed state, and the connection is ensured.

  Thereby, in the foundation pile 100 of this example, tools (not shown), such as a box wrench with a long handle, in which the head 53 of the hexagon bolt 50 is inserted into the pile body 20 from the opening on the rear end side. By tightening the screw, the front-rear portion of the front end side member 60 and the rear end side member 40 can be compressed, and the screw structure is made to reduce the distance between the front and rear. In addition, the screw (male screw 57) of the bolt 50 has a predetermined length L1 near the tip of the shaft portion 54. In this example, after the screw tightening for the length L1, the nut 65 is set so as to be separated from the female screw and idle. That is, the shaft portion 54a of the portion (the upper portion of the upper end in the figure of the male screw 57) connected to the male screw 57 has an outer diameter smaller than the valley diameter of the male screw 57, and its length L2 is a nut. It is larger than the height of 65 (the screw length of the female screw of the nut).

  As described above, in this example, after the screw of the length L1 is tightened, the screw (male screw 57) of the bolt 50 is set to be disengaged from the female screw of the nut 65 and idles. Then, the reduction of the distance between the front and rear ends of the front end side member 60 and the rear end side member 40 by screw tightening ends. In this example, as described above, the cylindrical tube 70 is directed to the rear end (lower end) 75 of the cylindrical tube 70 that is hanging down and the rear end side member 60 at the end when the screw tightening is finished (at the start of idling). The length (height) of the cylindrical tube 70 is set so that an appropriate gap (for example, about 1 mm to 5 mm) K is maintained between the surface 67 and the surface 67. In addition, when welding (tack welding) with the forward direction face 45 of the rear end side member 40 at the upper end of the cylindrical tube 70 is separated, the gap between the upper end of the cylindrical pipe 70 and the forward direction face 45 Will be held.

  On the other hand, in this example, when the front end side member 60 and the rear end side member 40 are compressed between the front and rear, and the distance between the front and rear is reduced, the tapered portion 30 and the pile main body 20 between the front and rear are reduced. So that the walls 25 and 35 of the pipe portions forming the two are separated in the circumferential direction of the foundation pile 100 itself so that they can be easily deformed by protruding outward or projecting outward. The walls 25 and 35 are provided with a means for easily deforming (in this example, a slit). In this example, the corners of the walls 25 and 35 that form the tapered portion 30 and the pile main body portion 20 between the front and rear ends of the front end side member 60 and the rear end side member 40 (corner of the corner pipe (corner portion) or the vicinity thereof). As a means for easily deforming, slits (vertical slits) Ts are provided continuously in the up and down direction, and each of the walls 25 and 35 is divided into four from the center in the circumferential direction of the foundation pile 100 itself. (See FIGS. 1 to 3).

  Moreover, in this example, in addition to this deformation | transformation easy means, the rear end side member 40 side part (near the rear end side member 40) among the front and back, the front-rear boundary part of the pile main-body part 20 and the taper part 30 In each of the bent parts (the tip 23 of the pile body 20) and the parts near the tip side member 60 (near the tip side member 60) (the previous three points), the corners are formed continuously in the corner. Slits (horizontal slits) Ys1, Ys2, and Ys3 are provided so that each wall (four walls in the circumferential direction) is partially cut (cut) laterally from both sides from the slit (vertical slit) Ts. Yes. Thus, in this example, in addition to the slit Ts extending vertically, each of the walls (flat plate portions) 25, 35 forming the front-rear side has slits Ys1, Ys2, Ys3 extending in the lateral direction at three points in the front-rear direction. Since it is provided, the locations (three locations) of the slits (lateral slits) are locally low in strength.

  As a result, in the above screw structure, the hexagon bolt 50 is compressed (tightened) through the head 53 so that the front-rear portion of the front end side member 60 and the rear end side member 40 is tightened. Thus, if the distance between the front and rear is reduced, the four walls 25 and 35 in the circumferential direction between the front and rear according to the compression state are the portions closer to the front end side member 60 and the rear end side member 40. Starting from the slits Ys1 and Ys3 at the offset part, the bent part that is the boundary part, that is, the part of the slit Ys2 provided at the tip 23 of the pile main body part protrudes sideways and forms a “V” shape. It is formed so as to deform in a form (see FIG. 5). It should be noted that the angle α (see FIG. 5B) of the “V” shape when the hexagon bolt 50 is screwed until idling is determined appropriately in consideration of sedimentation resistance and pullout resistance. For example, it is set to obtain about 90 degrees. That is, the stroke for tightening the screw is set so that the angle α is obtained, and the screw length (length L1 of the male screw 57) is set based on the stroke. In this example, when the hexagon bolt 50 is screwed until it is idle, moderately between the tip 75 of the cylindrical tube 70 and the rearward facing surface 67 of the tip side member 60 (for example, about 1 mm to 5 mm). The gap K is secured.

  Thus, in the foundation pile 100 of this example, like the conventional simple pile, this is driven into the ground (in the ground) and the upper end portion thereof is appropriately projected on the ground. Then, after the driving, for example, a screwing tool (not shown) such as an electric impact wrench is inserted from the opening on the rear end side (upper end) of the pile main body portion 20, and the shaft portion forming the wrench is inserted. The tip (box-shaped fitting portion) is fitted to the head 53 of the hexagon bolt 50 and tightened with screws. Then, the space | interval between the front and rear of the front end side member 60 and the rear end side member 40 becomes small, and each wall 25 and 35 after that comes to be compressed. And each four walls 25 and 35 in the circumferential direction are resisted against earth pressure in the state divided | segmented by the corner in the circumferential direction of foundation pile 100 itself, FIG. 5-A (left figure of FIG. 5). As shown in Fig. 4, it is deformed (plastically deformed) so as to protrude outward or project. Furthermore, the deformation gradually increases as the screw tightening proceeds. Then, the outer diameter of the rear shaft portion 54 a connected to the male screw 57 in the bolt 50 is set to be equal to or less than the root diameter of the male screw 57 over a length portion (part) L <b> 2 larger than the height dimension of the nut 60. Therefore, finally, the male screw 57 is detached from the screw (female screw) of the nut 65 and idles, and as shown in FIG. 5-B (the right diagram in FIG. 5), a predetermined deformation ("V of the angle α" "Shape deformation"), the deformation stops, and the screw tightening is finished.

  Thus, in the foundation pile 100 of this example, by continuing the screw tightening after the driving, a constant deformation can be obtained regardless of the operator, so that it has stable sedimentation resistance and pullout resistance. It can be formed as a foundation pile 100. In particular, in this example, it is a square pipe, and the same deformation can be obtained in the four walls in the circumferential direction. Therefore, when viewed from the front end, as shown in FIG. It will be protruding. As described above, in the foundation pile 100 of the present invention, the structure is not complicated, and the driving into the ground can be easily performed similarly to the conventional simple pile. With such a screw structure, it is only necessary to tighten the screw without using a special tool. Therefore, the foundation pile 100 which is easily excellent in sedimentation resistance and pull-out resistance can be obtained regardless of the construction site. After this construction, a desired mount, etc. is assembled using a mounting hole (not shown) such as a fixing means for the workpiece provided on the upper portion of the foundation pile 100, and a work such as a solar panel is attached thereto. An object can be installed, but its stable support can be obtained.

  That is, in this example, at the end of the screw tightening, the distal end (lower end) 75 of the cylindrical tube 70 provided in a hanging manner from the forward facing surface 45 of the rear end side member 40 and the rearward facing surface of the distal end side member 60. 67, there is only a minute gap K of about 1 mm to 5 mm. Therefore, after this screw tightening is completed, that is, for example, when the solar panel is installed with an inclination, an excessive weight (compression force) acts on the upper end of the foundation pile 100 due to the wind pressure, and the protrusion protrudes outward. Even if the wall portion that is deformed to be deformed is crushed and deformed so that the deformation angle α is reduced, the distal end (lower end) 75 of the cylindrical tube 70 hits the rearward facing surface 67 of the distal end side member 60. Since it is stopped, the crushed deformation is only the minute gap K in FIG. For this reason, even if there is such crushing deformation, as shown in the left half cross section of FIG. 7, substantial settlement of the foundation pile 100 can be prevented.

  That is, as shown in the right half cross section of FIG. 7, when the cylindrical tube 70 forming the spacing member is not provided, an excessive weight is placed on the upper portion of the foundation pile 100 after the screw tightening (after the completion of construction). When (compressive load) F is applied, the weight is applied to the walls 25 and 35 projecting outward or deforming and deforming so that the projecting and deforming walls are crushed downward. The pile body 20 may sink due to the deformation. On the other hand, in this example, since the cylindrical tube 70 that forms the interval holding member is provided, even if the same weight (compression load) F is applied, such deformation can be prevented, so that the foundation after the construction is completed. The substantial settling of the pile 100 can be stopped. As a result, the strength of the wall that protrudes outward or deforms in a projecting manner can be reduced as compared with the case where the cylindrical tube 70 is not provided. The work can be facilitated. As will be understood from this example, the gap K after screw tightening is preferably as small as possible in order to prevent crushing deformation and settling, but the size of the gap K may cause errors in the manufacture and assembly of the foundation pile 100. This should be set in consideration.

  In this example, the screw tightening is performed until idling, and then the gap K is set to be retained, but in the foundation pile of FIG. 1, as in the modification shown in FIG. The screw tightening can be ended when the distal end (lower end) 75 of the cylindrical tube 70 hits the rearward facing surface 67 of the distal end side member 60. That is, FIG. 8 illustrates a modification of the foundation pile (first embodiment) in FIG. 1 and shows the end of screw tightening (after deformation) corresponding to FIG. The tip end (lower end) 75 of the cylindrical tube 70 is a stopper for screw tightening. In addition, since such a modification does not have essential difference with the said example, only the difference is demonstrated, the same code | symbol is attached | subjected to the same or corresponding site | part, and the description is abbreviate | omitted. The same applies to the following examples.

  That is, in this example, in place of the bolt in the above example, the outer diameter does not have a portion (part) 54a that is equal to or less than the root diameter of the male screw 57, and the male screw 57 is formed over substantially the entire length of the shaft portion 54. The only difference is that all the screw bolts 51 are present. In this example, the distal end (lower end) 75 of the cylindrical tube 70 is the rearward facing surface of the distal end side member 60 in the process of increasing the deformation of the walls 25 and 35 by screw tightening after driving. After hitting 67, the screws cannot be tightened after that. In this example, unlike the above example, since there is basically no gap K, after the construction, even if an excessive weight (compression force) acts on the foundation pile 100, it is stopped by this screw tightening. It can be prevented that the distance between the front end side member 60 and the rear end side member 40 becomes smaller than the distance (dimension). Thereby, crushing deformation of walls 25 and 35 and sedimentation of foundation pile can be prevented more effectively. In addition, although understood also from this example, in the above example, the case where the proximal end (upper end) of the cylindrical tube 70 is welded to the forward facing surface 45 of the rear end side member 40 has been described. In such a case, such welding may be eliminated. Further, if there is no problem in the assembly as the foundation pile 100, the distal end 75 of the cylindrical tube 70 may be welded to the rearward facing surface 67 of the distal end side member 60, and such welding is omitted. May be.

  In the above example, as the means for easily deforming, the slit Ts is provided so as to be continuous in the vertical direction at the corner of the pipe walls 25 and 35 forming the tapered portion 30 and the pile main body portion 20 between the front and rear. In addition, as described above, slits Ys1, Ys2, and Ys3 extending in the lateral direction are also provided at the front and rear portions of the wall. For this reason, each wall (upper and lower flat plate portions) 25 and 35 sandwiched between slits Ts provided to be vertically connected to the corner protrudes outward with the boundary portion (the tip 23 of the pile body portion) as a bending point. It can be easily deformed in a protruding manner. In addition, said deformation | transformation is the thickness of the walls 25 and 35 which the taper part 30 and the pile main-body part 20 make between the front and back between the front end side member 60 and the rear end side member 40, and the front and rear length of the wall between the front and rear. The difficulty varies depending on the strength based on the width, material, and the like, and the earth pressure on the foundation pile 100 in the ground. For this reason, considering the difficulty, considering the strength of the ground (soil), the softness, etc. of the driving site so that the deformation can be obtained only by tightening the screws with an appropriate torque. It is sufficient to provide means for easily deforming.

  Moreover, in the above example, the case where the slit Ts is provided so as to be connected to the corner of the square pipe as an easy deformation means is illustrated. However, depending on the wall thickness, or the foundation pile 100 made of a low strength material. Yes, when a wall break (circumferential division) can be easily obtained due to stress concentration due to screw tightening, etc., a groove (thin wall portion) is replaced with a corner (for example, a corner of the outer peripheral surface of the wall). ) May be provided so as to be continuous in the vertical direction. That is, in the present invention, the circumferential direction of the pipe between the front and rear may be divided from the beginning as in the first embodiment, or may be appropriately deformed so that a divided state can be obtained by screw tightening. Means (thin wall portion or groove) may be provided. Further, in the above example, the corner pipe of the square pipe is embodied as the means for easily deforming so as to be continuous in the vertical direction. In the middle of the flat plate portion), it may be provided so as to be continuous in the vertical direction, or this may be provided in addition to that provided in the corner as in the above example.

  In the above example, the horizontal slits Ys1, Ys2, and Ys3 are provided as the easily deformable means extending in the horizontal direction. However, appropriate deformable easily means (cuts, thin portions, or grooves) may be provided. . Furthermore, depending on the wall thickness, or the foundation pile 100 made of a low-strength material, as long as the deformation that protrudes outward or protrudes easily can be obtained by screw tightening, the easy-to-deform means has an appropriate position. Or it may be provided at the site. In other words, the easy-to-deform means may be provided in an appropriate form at an appropriate position so that such deformation is obtained when the compression force is applied in the screw tightening. In the above example, the case where the shape is deformed in a horizontal “V” shape has been described. However, the form of the deformation is not limited to this, and the shape protrudes outward or bulges (swells). What is necessary is just to set the deformation | transformation method and quantity (projection amount) so that it may become an appropriate thing according to the ground etc.

  Furthermore, in the above example, the pile main body portion 20 has a square pipe structure with a constant cross section before and after, and the tapered portion 30 is formed with a quadrangular pyramid pipe structure with the distal end of the square pipe as a base end. However, the pile main body 20 and the tapered portion 30 forming the foundation pile 100 of the present invention can be embodied as those having other polygonal shapes (hexagons, octagons, etc.). . Moreover, the pile main-body part 20 has a circular circular pipe (pipe) structure where a cross section is constant ahead, and the taper part 30 can be embodied as a thing of a conical pipe structure. Thus, the foundation pile 100 of this invention is widely applicable in a pipe-shaped thing.

  Now, the foundation pile 200 of 2nd Example is demonstrated based on FIG. However, the foundation pile 200 of the present example has a configuration in which a portion (cap-shaped portion) 37 positioned ahead of the distal end side member 60 welded to the tapered portion 30 in the first embodiment is removed. is there. As described above, in this example, the tapered portion 30 in the first embodiment does not have the portion (cap-shaped portion) 37 having the pointed tip portion, that is, the square pyramid tapered portion 30 is positioned on the tip side. Only the point that the nut 65 is exposed at the tip of the tip side member 60 and the tip of the shaft portion 54 of the bolt 50 is exposed at the tip of the member 60 as a truncated pyramid shape with its head cut off. The only difference is the first embodiment. Thus, in this example, the taper part 30 is formed substantially shorter than in the first example, and the tip side member 60 is provided at the tip of the taper part 30 only in the above example. Since only the differences are described, the differences will be mainly described, and the same or corresponding parts are designated by the same reference numerals.

  That is, in the first embodiment, since the tapered portion 30 has the cap-shaped portion 37, the nut 65 forming the tip side member 60 and the tip of the shaft portion 54 of the bolt 50 are surrounded and protected. The effect that the tip shape of the tapered portion 30 can be kept constant can be obtained. On the other hand, in order to obtain such actions and effects, when the cap-shaped portion 37 is provided, the number of parts and attachment processes (welding processes) are increased. To be complicated. On the other hand, in the second embodiment, not only the manufacturing process but also the structure can be simplified by the absence of the cap-shaped portion 37. In addition, in the first embodiment, when the tip of the shaft portion 54 of the bolt 50 is protruded from the nut 65 during screw tightening, it is necessary to fit within the tapered portion 30. Therefore, the taper of the tapered portion 30 is reduced. Since the taper cannot be sharply tapered, the length of the tapered portion 30 tends to be long, but there is no such problem in the second embodiment. In the second embodiment, the tapered portion 30 is set to have a tapered state (with a taper angle) or to form the distal end side member 60 so that the distal end thereof is easily driven into the ground. In order to make the nut 65 easy to be driven into the ground, as shown by the two-dot chain line in the figure, it is made longer and tapered, and the size is suitable for the tip of the pile, A nut 65 structure may be used. In this case, when the tip of the bolt 50 is protruded from the beginning of the screw structure, the tip 58 is preferably tapered as shown by a two-dot chain line in the figure.

  Next, the foundation pile 300 according to the third embodiment will be described with reference to FIGS. 10 and 11, which is different from that according to the first embodiment in the screw structure and the cylindrical tube 70 forming the spacing member. Since the only difference is that the arrangement is changed as shown in FIG. 10, only this difference will be described, and the same portions are only given the same reference numerals. That is, this screw structure is as follows. The front end side member 60 is provided with a bolt 50 having a shaft portion 54 extending rearward in a standing manner. For example, a through hole 63 is formed in the distal end side member 60 so that the shaft portion 54 of the hexagon bolt 50 extends rearward, and the head portion 53 is fixed to the distal end side member 60 by welding or the like. However, a cylindrical tube 70 having a predetermined front and rear length that forms a spacing member is externally fitted to the shaft portion 54 of the bolt 50 in a gap fitting state. The distal end 75 of the cylindrical tube 70 may or may not be welded to the rearward facing surface (upward surface) 67 of the distal end side member 60.

  The rear end side member 40 is provided with a through hole 43 through which a rear end or a portion near the rear end (male screw 57) which is a free end of the shaft portion 54 of the bolt 50 can be inserted. A rear end or a portion near the rear end of 54 is inserted through the through-hole 43 and protrudes rearward. Then, a nut 65 is screwed into the male screw 57 provided at the rear end or the rear end portion of the shaft portion 54 protruding rearward from the rear side of the rear end side member 40. Also in this example, the outer diameter of the shaft portion 54a connected to the portion of the male screw 57 having a predetermined length in the bolt 50 is set to be equal to or less than the valley diameter of the male screw 57, and the nut 65 is rotated to tighten the screw. By continuing the predetermined amount, the length of the shaft portion 54a is set to be a predetermined length (more than the height of the nut 65) so that the nut 65 can idle to the thin shaft portion 54a. . The front-rear length of the cylindrical tube 70 is the same as that in the first embodiment between the rear end 77 of the cylindrical tube 70 and the front-facing surface 45 of the rear-end side member 40 when this idling occurs. It is set so as to obtain an appropriate minute gap (for example, about 1 mm to 5 mm) K (see FIG. 11-B). Further, the nut 65 may be directly screwed to the bolt 50 as long as it can be locked to the through hole 43, but in this example, the nut 65 is screwed via a washer 59. That is, in this example, the front end side member 60 and the rear end side member 40 are connected by a screw structure by screwing of the nut 65.

  In the third embodiment, unlike the first embodiment, the nut 65 is rotated by a tool inserted into the pile main body 20 from the rear (rear end) opening, thereby tightening the screw. By this screw tightening, the distance between the front and rear ends of the front end side member 60 and the rear end side member 40 is reduced. Thereby, also in this example foundation pile 300, after driving | running | working, as shown to FIG. 11-A, the space | interval between the front-rear side of the front end side member 60 and the rear end side member 40 is small. Become. And by advancing rotation (screw tightening) of the nut 65, the outer diameter of the shaft portion 54a connected to the male screw 57 in the bolt 50 is set to be equal to or less than the root diameter of the male screw 57 over a predetermined length. Finally, the nut 65 is detached from the male screw 57 and idles. As a result, as shown in FIG. 11-B, it becomes a predetermined deformation and the deformation stops. When the deformation is stopped, a minute gap (for example, about 1 mm to 5 mm) K is held between the rear end 77 of the cylindrical tube 70 and the forward facing surface 45 of the rear end side member 40. Thus, in this example as well as the first example, the desired deformation can be easily obtained, and the sedimentation of the foundation pile 300 after the construction can be stopped by the minute gap K. Can prevent sedimentation.

  This example is suitable when the screwing stroke is small, that is, when a desired deformation can be obtained even if the number of rotations of the nut 65 is small. This is because, in the first embodiment, the front end of the bolt 50 protrudes forward from the front end side member 60 (nut 65) by screw tightening, so that a space that can accommodate this is required as described above. On the other hand, in this example, since the end of the bolt 50 by screw tightening protrudes rearward of the rear end side member 40, this space is unnecessary. For this reason, the taper part 30 can also make a taper sharply taper or shorten. That is, unlike the first embodiment, it is not necessary to consider the protruding amount of the tip of the bolt 50, so that the degree of freedom in designing the tapered portion 30 can be increased. When the tapered portion 30 is sharply tapered, although resistance when the foundation pile 200 is driven increases, there is no problem in soft ground, which is preferable. In this example, the end of the bolt 50 by screw tightening (the upper end in FIG. 11) protrudes rearward of the rear end side member 40, so the fitting portion of the nut 65 in the tool for screw tightening It is sufficient to use a deep one that allows that amount.

  Also, the third embodiment may be the same as the second embodiment. That is, as in the foundation pile 400 of the fourth embodiment shown in FIG. 12, it is assumed that there is no cap-shaped portion 37 located in the front portion of the tapered portion 30 in the third embodiment than the tip side member 60. Also good. Also in this case, since the front end side member 60 is exposed at the front end of the foundation pile 200, in order to improve the driveability to the ground, as shown by the two-dot chain line in FIG. The tip-facing surface (the head 53 of the bolt 50) should be tapered as much as possible at the tip of the pile. In the second embodiment, when the tip of the bolt 50 is protruded from the tip of the nut 65, a large external force is applied to the screw (thread) of the screwed portion between the bolt 50 and the nut 65 when driving. You will receive it directly. On the other hand, since it is not in this example, damage to the screw thread can be avoided, so that it is possible to avoid troubles in screw tightening after driving.

  The present invention is not limited to the above-described embodiments, and can be embodied with appropriate modifications without departing from the spirit of the present invention. In the above example, the wall of the pipe divided in the circumferential direction between the front and rear is deformed outwardly in a laterally “V” shape in the front and rear (up and down). When the member and the rear end side member are compressed between the front and rear and the distance between the front and rear is reduced, the wall that forms the tapered portion and the pile body portion between the front and rear is the circumference of the foundation pile itself. It suffices if it can be deformed so as to protrude outward or project outward while being divided in the direction. Therefore, the wall of this pipe may swell outward in a circular arc shape at the front and back (up and down). In other words, the easy-to-deform means provided on the front-rear wall only needs to provide such deformation when the distance between the front-rear is reduced.

  Further, the screw structure in the present invention is not limited to those illustrated in the above embodiments. The front end side member and the rear end side member may be a screw structure that can reduce the distance between the front and rear by screw tightening with a tool inserted from an opening on the rear end side into the pile main body. In addition, the interval holding member in the present invention has a predetermined interval between the front and rear ends of the front end side member and the rear end side member so that the interval does not become smaller than a predetermined dimension after the interval is reduced by screw tightening. What is necessary is just to be provided as what has front and rear length. Furthermore, even when this is a hollow member, it is not limited to a cylindrical tube, and may be a square pipe. The pipe-shaped pile body is usually made of steel, and the specifications of the pipe diameter (thickness), wall thickness, length, etc. What is necessary is just to select suitably according to the softness of the ground to be used. Moreover, what is necessary is just to set the taper condition (taper) of a taper part suitably according to the thickness of a foundation pile, the intensity | strength of a ground, etc. Furthermore, the foundation pile has no hindrance to driving, and in the above bolt tightening, it may be selected from those that can obtain the above deformation (plastic deformation) with an appropriate tightening force, and the material is not limited. As described above.

20 The tip of the pipe-shaped pile body 23 The tip of the pile body
25, 35 Wall which forms tapered part and pile body part 30 Tapered part 40 Rear end side member 43 Through hole of rear end side member 40 Forward direction face of rear end side member 50, 51 Bolt 53 Bolt head 54 Bolt head Shaft portion 57 Male screw of bolt 60 Tip side member 65 Nut 67 Backward facing surface of tip side member 70 Cylindrical tube (interval holding member)
75 End of cylindrical tube 100, 200, 300, 400 Foundation pile Ts, Ys1, Ys2, Ys3 Slit (easy deformation means)

Claims (8)

In the foundation pile which is integrally provided with a tapered portion formed in the shape of a tapered pipe from the tip of the pipe-shaped pile main body portion where the cross section is constant afterwards ,
A rear end side member is provided in the pile main body portion and behind the front end of the pile main body portion, and in the tapered portion and ahead of the front end of the pile main body portion or on the front end of the tapered portion. While having a member,
When the front end side member and the rear end side member are compressed between the front and rear, and the space between the front and rear is reduced, a wall that forms the tapered portion and the pile main body portion between the front and rear is a foundation pile. The wall forming the tapered portion and the pile main body portion between the front and rear sides is provided with an easy-to-deform means so as to project outward or to be deformed in a state of being divided in the circumferential direction of itself. And
The front end side member and the rear end side member are coupled with a screw structure that can reduce the space between the front and rear by screw tightening with a tool inserted from the rear opening into the pile main body, and the screw An interval holding member having a predetermined front and rear length is provided between the front and rear ends of the front end side member and the rear end side member so that the interval does not become smaller than a predetermined dimension after the interval is reduced by tightening. A foundation pile characterized by The rear end side member is provided with a through hole through which a shaft portion of a bolt with a head can be inserted and the head portion can be locked. A female screw is provided in which a male screw provided at the tip or near the tip of the shaft is screwed.
The shaft of the bolt is inserted into the through hole, the male screw is screwed into the female screw, and the front end side member and the rear end side member are connected by a screw structure by this screwing. The foundation pile according to claim 1 characterized by things.   A bolt having a shaft portion extending rearward is provided on the front end side member so as to stand upright, and a rear end portion or a rear end portion portion of the bolt shaft portion is inserted into the rear end side member. And a rear end of the shaft portion or a portion near the rear end is inserted through the through hole and protrudes rearward, and the rear end of the shaft portion protruded rearward or A nut that can be locked in the through hole is screwed into a male screw provided near the rear end, and the front end side member and the rear end side member are connected by a screw structure by this screwing. The foundation pile according to claim 1 characterized by things.   The screw length of the male screw is set to a predetermined length so that the interval between the front and rear is reduced by the screw tightening, and when the interval reaches a predetermined amount, the rotation in the screw tightening is idle. The outer diameter of the predetermined length portion of the shaft portion connected to the male screw is set to be equal to or smaller than the diameter of the valley of the male screw. Foundation pile.   The foundation pile according to any one of claims 2 to 4, wherein the spacing member is a hollow member formed by allowing a shaft portion of the bolt to pass through the hollow portion of the space retaining member in a gap-fitted state. .   The deformation facilitating means is provided on the wall that forms the taper portion and the pile main body portion between the front and rear sides at intervals in the circumferential direction in the cross section of the pile main body portion and the tapered portion. The foundation pile according to any one of claims 1 to 5, characterized by being. The pile body portion has a square pipe structure with a constant cross section before and after, and the tapered portion is formed in a pyramid or a truncated pyramid pipe structure whose base end is the tip of the square pipe,
The said easy-to-deform means is provided in the corner of the wall which makes the said taper part and the said pile main-body part between the said front and back, or it is provided in a row near the corner. A foundation pile according to item 1.   Apart from the deformation facilitating means provided in a row in the vertical direction, the deformation facilitating means includes a boundary part between the pile main body part and the taper part, a part closer to the tip side member, and the rear part. The foundation pile according to any one of claims 6 and 7, wherein the foundation pile is provided so as to extend in a lateral direction in at least one of the three portions closer to the end member.

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