JP6475103B2 - 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. In particular, foundation piles that support flat installations that are installed at an inclination with respect to the ground, such as solar panels, are subject to settling (subsidence) force depending on the wind direction due to the wind blown on the panel. Since the pulling force is always applied, there is a difficulty in the fixing force in the 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 stepwise deformed outward, so the sedimentation resistance and pullout resistance according to the ground strength. Is obtained.

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, bolting with a wrench, which is a general-purpose tool (screw tightening) Although there is a merit that sedimentation resistance and pull-out resistance can be improved only by work, 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 comprising a tapered portion formed in a tapered pipe shape at the tip of a pipe-shaped pile body portion,
The pile body member forming the pile body portion and the tapered member forming the tapered portion are formed separately,
The tapered member includes a tapered pipe portion and a tip portion provided at the tip thereof, and is provided at the tip of the pile body member.
The wall that forms the tapered pipe part has a plurality of divided walls divided into a plurality along a virtual cutting line in the front-rear direction at a plurality of predetermined ranges in the circumferential direction of the foundation pile itself from the rear end to the front. ,
When the tapered member is pulled backward with respect to the pile body member, the tip of the pile body member is relatively positioned at the rear end or rear end portion inside the tapered pipe portion formed by the dividing wall. Will be pushed toward the other side,
Due to the outward force or the forward force that the dividing wall receives by being pushed in, each of the dividing walls is deformed so as to protrude outward from the outer edge at the front end of the pile body member with the rear end as a free end. The taper member is provided at the tip of the pile body member;
Moreover, the tip portion of the tapered member is provided with a screw hole penetrating the tip,
The pile body member includes a bolt support portion provided with a penetrating portion that passes the shaft portion of the bolt forward and backward at the tip or inside thereof, and the bolt is passed through the penetrating portion, and The male screw of the shaft portion is screwed into the female screw of the screw hole at the tip portion, and the bolt is screwed with a tool inserted from the rear of the pile body member, The taper member is connected by a screw structure that can be pulled rearward.

The present invention according to claim 2 is a foundation pile comprising a tapered portion formed in a tapered pipe shape at the tip of a pipe-shaped pile body portion,
The pile body member forming the pile body portion and the tapered member forming the tapered portion are formed separately,
The tapered member includes a tapered pipe portion and a tip portion provided at the tip thereof, and is provided at the tip of the pile body member.
The wall forming the tapered pipe portion is subjected to an outward or forward force, so that a predetermined range from the rear end toward the front is a plurality of locations in the circumferential direction of the foundation pile itself, and a virtual cutting line in the front-rear direction. It is provided with easy break means along the virtual cutting line so as to be divided into a plurality of divided walls that are broken along
When the tapered member is pulled backward with respect to the pile main body member, the tip of the pile main body member is relatively directed toward the front from the rear end or the rear end portion inside the tapered pipe portion. Will be pushed,
The wall that forms the tapered pipe portion is subjected to an outward force or a forward force by being pushed in, and is broken along the virtual cutting line to form a plurality of divided walls. The taper member is provided at the tip of the pile body member so that the end is a free end and is deformed so as to project outward from the outer edge at the tip of the pile body member,
Moreover, the tip portion of the tapered member is provided with a screw hole penetrating the tip,
The pile body member includes a bolt support portion provided with a penetrating portion that passes the shaft portion of the bolt forward and backward at the tip or inside thereof, and the bolt is passed through the penetrating portion, and The male screw of the shaft portion is screwed into the female screw of the screw hole at the tip portion, and the bolt is screwed with a tool inserted from the rear of the pile body member, The taper member is connected by a screw structure that can be pulled rearward.

According to the third aspect of the present invention, the pile main body member has a square pipe structure, and the tapered pipe portion of the tapered member is a pyramid or a truncated pyramid having a distal end of the pile main body member as a base end. 2. The foundation pile according to claim 1, wherein the foundation pile is provided at a tip of the pile body member as a shape, and is divided at a corner of the cross section or in the vicinity of the corner in the shape of the pyramid or the truncated pyramid.
According to a fourth aspect of the present invention, the pile body member has a square pipe structure, and the tapered pipe portion of the taper member is a pyramid or a truncated pyramid having a distal end of the pile body member as a base end. The shape of the pile body member is provided at the tip of the pile body member, and the breakable means is provided at a corner of the cross section or in the vicinity of the corner in the shape of the pyramid or the truncated pyramid. The foundation pile.
The present invention according to claim 5 is the foundation pile according to any one of claims 1 to 4, wherein the bolt is restricted from moving backward relative to the bolt support portion. .

In the present invention according to claim 6, a chamfer is formed at an angle formed by a tip-oriented surface near the tip of the pile body member or the tip of the pile body member and an outer peripheral surface of the pile body member. The rear end of the tapered pipe portion, or the portion closer to the inner surface of the rear end thereof is held in contact with or close to the chamfering, according to any one of claims 1 to 5. It is a foundation pile.
The present invention according to claim 7 is characterized in that the screw length of the male screw is such that when the amount of pulling backward of the tapered member by the screw tightening 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 equal to or smaller than the diameter of the valley of the male screw. It is a foundation pile of any one of.

  In the foundation pile of this invention which concerns on Claim 1 or 2, since it has the above-mentioned structure, it can embed | buy this in the ground by driving in like a conventional simple pipe pile. After the driving, by inserting a tool (for example, a screwing tool such as an electric impact wrench) from the upper opening of the pile body member and screwing (bolt tightening), each dividing wall in the tapered member is The spreading deformation which protrudes outside from the outer edge in the front-end | tip of the said pile main body member can be made. And by this spreading deformation of each dividing wall, the settling resistance and the pullout resistance are enhanced. Since the foundation pile of this invention is clear from the structure, it does not require the structure for separate deformation | transformation easy like a pipe wall deformation member etc. like the above-mentioned two-stage compression deformation type foundation pile. Thus, a foundation pile excellent in sedimentation resistance and pullout resistance can be obtained without causing complication of the structure. In the present invention, the amount of outward protrusion (protrusion amount) in the spreading deformation is appropriately set according to the settling resistance and the pullout resistance.

  And in the foundation pile of the present invention, the wall forming the tapered pipe portion may be divided into a plurality of divided walls in advance as in the invention described in claim 1, As described in the invention, by receiving an outward or forward force, a predetermined range from the rear end toward the front is broken along a virtual cutting line in the front-rear direction at a plurality of locations in the circumferential direction of the foundation pile itself. It is good also as what is provided with the easy fracture | rupture means along this virtual cutting line so that it may become the division wall divided | segmented into plurality. In the second aspect of the present invention, by screwing after being driven into the ground, it breaks to become a dividing wall and obtains outward expansion deformation. For this reason, an easy breakage means may be provided on the basis of the strength of the tapered pipe portion or the like so as to be able to be broken by a torque by appropriate screw tightening and to obtain a spreading deformation.

  The easy break means in the invention of claim 2 may be obtained by rupturing with an appropriate screw tightening torque based on the strength or thickness of the wall forming the tapered pipe portion, and the strength of the wall that facilitates breakage. It is a lowering means. Therefore, at a plurality of locations in the circumferential direction of the foundation pile itself, it is possible to cut a groove extending vertically (front-rear direction) on the outer peripheral surface of the wall to provide a thin-walled portion, or a slit ( For example, a long through hole) is provided, and a combination thereof is exemplified. Further, as in the first aspect of the invention, the wall forming the tapered pipe portion has a predetermined range from the rear end to the front at a plurality of locations in the circumferential direction of the foundation pile itself, along a virtual cutting line in the front-rear direction. In what constitutes a divided wall divided into a plurality of parts, adjacent divided walls are partially welded, for example, at one of their rear ends to such an extent that they can be easily broken, that is, by temporary welding. Therefore, when it cannot be said that it is a dividing wall, it is included in the invention of claim 2.

  Although the cross-sectional shape of the tapered pipe part in the pile main body member or the tapered member of the present invention is not limited, it is usually a square shape. For example, it is a square pipe having a square cross section, such as a square steel pipe such as a square pipe (a square pipe having a substantially square cross section (equal side)) having a constant cross section. And when a pile main body member shall have a square pipe structure as described in Claim 3 or 4, the tapered pipe part in a taper member is a pyramid or a pyramid which makes the front-end | tip of this pile main body member a base end. It is good to provide at the front-end | tip of this pile main-body member as a base shape. In this case, as described in claim 3 or 4, it is preferable that the cross section is divided in the corner or in the vicinity of the corner, or the breakable means is provided. This is because spreading deformation becomes easy. In the present application, the shape of a pyramid, a truncated pyramid, a square, or the like does not refer to a mathematical (graphic) meaning, but generally refers to a meaning used in a structure or an industrial product. In the present invention, the square pipe includes, in addition to the general structural square steel pipe, the whole or a part thereof, for example, a belt-like plate material (or plate material) such as flat steel that is assembled by welding or the like.

  In the present invention, in the foundation pile driving process, the tip of the tapered member is pushed backward (compressed up and down) in the axial direction (front-rear direction) of the foundation pile. For this reason, when the ground strength is higher than expected and the strength of the wall forming the tapered pipe portion is relatively low, the wall forming the tapered pipe portion may be deformed during the driving process. For this reason, in order to prevent such a situation, it is preferable to provide means for restricting the bolt from moving backward relative to the bolt support portion as described in claim 5. If it does in this way, since it can resist the driving force (up-and-down compression force) by the axial part of a bolt in the driving, it is effective in preventing that the wall deforms in the driving process. It is for the purpose.

  Further, as in the invention described in claim 6, chamfering is formed at an angle formed by the tip-facing surface near the tip and the outer peripheral surface of the pile main body member, and the taper-like shape of the taper member It is preferable that the rear end of the pipe portion or the portion closer to the inner surface of the rear end is held in contact with or close to the chamfer. In this way, when the taper member is pulled backward, the rear end of the tapered pipe portion or the portion closer to the inner surface of the rear end is guided by the chamfering, so that the spreading deformation is facilitated. . That is, in this way, the dividing wall is directed from the rear end side to the front side, pressed against the chamfer, and can be deformed so as to be guided and slid there, so that the deformation can be facilitated.

  As the bolt used in the present invention, for example, an all screw bolt in which a male screw is formed over the entire length of the shaft portion may be used. When the amount reaches a predetermined amount, the rotation in the screw tightening can be idle. As a result, the screw tightening operator can easily know that the predetermined deformation amount to be deformed has been secured by the occurrence of the idling, so that the spread deformation amount by the operator is not varied and appropriate and stable. Construction is ensured. The male screw length or the like may be set so that appropriate deformation can be obtained. The length of the shaft portion whose outer diameter is equal to or less than the diameter of the valley of the male screw is set as a length necessary for idling (more than the length of the female screw) when the screwing with the female screw is released. That's fine.

  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.

  In addition, the foundation pile of the present invention is usually a metal pipe including a pile main body member, and as a typical example, it is costly 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 aluminum alloy. However, the foundation pile of the present invention, or the pile main body member and the tapered member forming the same are not limited to materials, and may be assembled or manufactured into a pipe structure from a plate material by welding or the like, as described above. Such a pipe structure (pipe) may be connected to a pipe such as a general structural square steel pipe.

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 whole sectional view of the principal part of the foundation pile of Drawing 1, and the transverse cross section in each position of the direction back and forth. A is the figure which looked at the foundation pile from the rear end, B is the figure which looked at the foundation pile from the front end. In FIG. 3, the enlarged view of the principal part seen from the arrow A direction (enlarged external view of the principal part which looked at the elevation from the diagonal direction). FIG. 2 is an enlarged longitudinal sectional view of a main part for explaining the middle of deforming a dividing wall by rotating a bolt and tightening a screw after driving the foundation pile of FIG. 1 into the ground. The enlarged longitudinal cross-sectional view of the principal part explaining the deformation | transformation of a division wall by screwing until a volt | bolt idles. The figure which looked at FIG. 6 from the front end side. The figure equivalent to FIG. 4 explaining the modification of the foundation pile (1st Example) of FIG. 1 (enlarged external view of the principal part which looked at the elevation from the diagonal direction). Sectional drawing in the position corresponded in sectional drawing of S1-S3 of FIG. 2 explaining another example of a tapered member.

  Embodiment 1 (first embodiment) embodying a foundation pile according to the present invention will be described in detail with reference to FIGS. The foundation pile 100 of the present example is a tapered portion formed in a tapered pipe shape at the tip 12 of a pile body portion 10 having a square pipe (cross section, substantially square corner) having a constant cross section in the front (upper and lower sides in the drawing). 30. However, the pile main body portion 10 is composed of a pipe-shaped pile main body member (a square pipe having a substantially square cross section), and the tapered portion 30 is composed of a tapered member 31 having a tapered pipe shape. Both of these are made of steel in this example, and are formed separately. The details will be described later, but the proximal end (rear end) 33 of the tapered member 31 is the outer edge (or the vicinity of the outer edge) of the distal end 12 of the pile body member 11. 13 are arranged so as to contact or be close to each other, and both are connected by a screw structure, as will be described in detail later.

  The tapered member 31 includes a tapered pipe portion 34 and a tip portion 35 provided at the tip thereof. In this example, the tapered pipe portion 34 is formed in the shape of a tapered pipe with a square pan (trapezoid) shape. For example, a tip member 35a is welded so as to close the tip 34s, thereby forming the tip portion 35. ing. However, as will be described later, the tip portion 35 is provided with a nut 35n by welding or the like in order to form a screw hole (not shown) penetrating later. The wall (pipe wall) 34w forming the tapered pipe portion 34 has a predetermined range Hs (see FIG. 4) from the rear end (rear end of the tapered member 31) 33 to the front, and the circumferential direction of the pipe (foundation pile itself) In this example, as shown in FIGS. 2 to 4, at the four corners (or the corner vicinity) 34 c in the cross section, along the virtual cutting line Lk (see FIG. 4) in the front-rear direction. It is divided into four dividing walls 34b. The predetermined range Hs may be from the rear end 33 of the wall 34w forming the tapered pipe portion 34 to the intermediate position from the rear end 33 to the front end 34s, but in this example, from the rear end 33 to the front end of the wall (the tapered pipe portion 34). Is divided over the entire length). Accordingly, the tapered pipe portion 34 having a square pan (trapezoid) shape is constituted by four walls (divided walls) 34b. In this example, the dividing wall 34b is divided on the diagonal line in the square cross section, but the dividing method is not limited to this.

 In this example, the tapered pipe portion 34 is formed in a square truncated cone shape and is tapered, but the tapered pipe portion 34 has a base (a square in the cross section) of the outer edge 13 of the distal end 12 of the pile body member 11 ( A square trapezoidal shape that is the rear end) is extended to the front. That is, in the taper member 31, the lateral sides at the rear ends 33 of the four dividing walls 34 b extending rearward from the tip portion 35 are respectively formed on the square sides that are the outer edges 13 of the tip 12 of the pile body member 11. It arrange | positions so that it may contact | abut or adjoin. However, a square plate member 14 having the same shape and dimensions as the tip (contour) of the pile main body member 11 so as to close the opening and having a rounded corner similar to a square pipe is welded. The tip 12 of the pile main body member 11 is fixed. As will be described later, the plate material 14 forms a bolt support portion 16 provided with a through portion (through hole) 15 through which the shaft portion 52 of the bolt 50 passes. In this example, the opposite side dimension of the square is large or small. It consists of two kinds of plate materials, with a small plate material 14a at the tip side, and two sheets are stacked and welded so that the two sheets are concentric and the sides are parallel.

  The larger plate member 14b forming the bolt support portion 16 is the same as the outer dimension (opposite side dimension) in the cross section of the square pipe, and the outer dimension of the smaller plate member 14a is divided from the outer dimension of the larger plate member 14b. The size is obtained by subtracting about twice the wall thickness (wall thickness) of the wall 34b. In this example, a chamfer 17 is provided at the corner (outer edge of the square side) between the tip-facing surface of the larger plate member 14b and the outer peripheral surface (the outer peripheral surface 10a side of the pipe forming the pile main body member 11). ing. The taper member 31 has a rear end 33 or an inward portion of the rear end of the tapered pipe portion 34 with respect to the portion of the chamfer 17 (in this example, the rear end 33 or the inward portion of the rear end of each dividing wall 34b). ) Are arranged so as to contact or be close to each other. However, in this example, chamfers 33m are also provided at the corners of the rear end (rear end surface) 33 and the inner peripheral surface of the tapered pipe portion 34, and both of the chamfers 17 and 33m are in contact with or close to each other. In the arrangement state, the outer edge of the rear end 33 of the tapered pipe portion 34 is reduced by reducing the outer dimension of the plate member 14a located on the front end side as described above. It is made to correspond to the outer edge 13 of the tip of each. In addition, the wall (partition wall) 34w having a rectangular trapezoidal shape that forms the tapered pipe portion 34 has a slope wall whose cross section changes relatively abruptly at the rear end portion, and other portions near the tip end are relatively It has a gently changing slope wall.

  Such a tapered member 31 is pulled backward (upward in FIG. 1) with respect to the pile main body member 11, so that the tip of the pile main body member 11 is relatively formed into a tapered pipe portion 34 formed by the dividing wall 34b. It is comprised so that it may be pushed toward the front from the rear end 33 or the part near a rear end inside. That is, by being pushed in, the four dividing walls 34b forming the tapered pipe portion 34 are directed from the rear end 33 or the rear end portion toward the front, and the chamfering (or the vicinity of the outer edge) of the outer edge 13 at the front end of the pile body member 11 is performed. 5 and 6, as shown in FIG. 5 and FIG. 6, it receives outward force or forward force (external force) F1 and F2, and each of the dividing walls 34b is piled with its rear end 33 as a free end. The front end of the main body member 11 is configured to undergo spreading deformation (plastic deformation) protruding outward from the outer edge 13. Next, means for attracting the taper member 31 to the rear will be described.

  As described above, the nut 35n having a female screw (not shown) into which the male screw 53 of the shaft portion 52 of the bolt 50 described later is screwed is provided at the center of the tip portion 35 of the tapered member 31. The screw hole (not shown) made of this female screw may be provided through the front and rear, and may be provided in the tip member 35a itself forming the tip portion 35. In this example, the tip portion 35 is formed. A through hole 35k through which the shaft portion 52 of the bolt 50 passes is provided in the center of the tip member 35a, and a nut 35n having a screw hole (female screw) is fixed to the tip-facing surface of the tip member 35a by welding. The tip portion 35 is formed including the nut 35n.

 Moreover, as above-mentioned, the bolt support site | part 16 which consists of board | plate materials is provided in the front-end | tip of the pile main body member 11, and the penetration part (through-hole) which lets the axial part 52 of the volt | bolt 50 pass through the center in the center. 15 is provided. A shaft portion 52 of a bolt (for example, hexagon bolt) 50 is passed through the through portion 15 from the rear. Then, the male screw 53 formed on the shaft portion 52 protruding forward from the penetrating portion 15 is screwed into the female screw of the nut 35 n at the tip portion 35. The bolt 50 has an appropriate slip washer 61 interposed between a head 51 (front-facing surface of the head) and a rearward facing surface (periphery of the rear end of the penetrating portion 15) in the bolt support portion 16. It is set to be engaged. When the head portion 51 of the bolt 50 is engaged in this way, the rear end 33 of the dividing wall 34b or the portion closer to the inner surface of the rear end is the tip of the pile body member 11 as described above. A tapered member 31 is disposed at the tip 12 of the pile body member 11 so as to abut or approach the chamfer 17 of the outer edge 13 or the vicinity of the outer edge. Thereby, the taper member 31 is connected by the screw structure which can be drawn back of the pile main body member 11 by the screw fastening of the volt | bolt 50. FIG. In this example, the length of the shaft portion 52 is set so that an appropriate amount of the tip of the shaft portion 52 of the bolt 50 protrudes from the tip of the nut 35n in this connected state. The tip 54 is pointed in a tapered shape.

  In this example, the tip-facing surface of the bolt support portion 16 and a minute gap are formed in the portion of the male screw 53 that protrudes toward the tip-facing surface side of the bolt support portion 16 of the shaft portion 52 of the bolt 50. Another nut 63 similar to the nut 35n is screwed so as to be held, and the male screw 53 is applied, for example, by applying an adhesive to the screwing surface (the surface of the female screw of the nut 63) so as not to move. It is fixed to. The nut 63 is structured so that the rear facing surface is structurally engaged with the tip-facing surface of the bolt support portion 16, so that the bolt 50 is prevented from moving backward relative to the bolt support portion 16. ing. That is, by providing the means for preventing the backward movement of the bolt 50 in this way, when the foundation pile 100 is driven into the ground, the ground strength is higher than expected, and the strength of the wall 34w forming the tapered pipe portion 34 is increased. Even if it is relatively low, it is possible to prevent the wall 34w forming the tapered pipe portion 34 from being deformed during the driving process. That is, since the shaft portion 52 of the bolt 50 can also resist the driving force (up and down compression force), the wall 34w is prevented from being deformed in the driving process.

  When the bolt 50 is provided with the rearward movement preventing means (nut 63) in this way, the slip washer 62 is also provided between the nut 63 and the tip-facing surface of the bolt support portion 16 in order to facilitate the rotation of the bolt 50. It is good to interpose. The backward movement preventing means of the bolt 50 only needs to stop the bolt 50 from moving backward with respect to the bolt support portion 16. For example, the bolt 50 is not the nut 63 as described above, but, for example, the shaft portion 52 of the bolt 50. An engaging member may be provided so that the movement is structurally stopped by driving a pin or the like. Further, regardless of the presence or absence of such a backward movement preventing means such as the nut 63, the arrangement state in which the bolt 50 is screwed into the screw hole (nut 35n) (an assembly state of the foundation pile, that is, a state before screw tightening). In this case, it is preferable to provide an appropriate play (gap) between the forward face of the head 51 of the bolt 50 and the rearward face of the bolt support portion 16.

  As the bolt 50, the entire screw bolt 50 in which the male screw 53 is formed over the entire length of the shaft portion 52 may be used as it is. However, in this example, the amount of pulling the taper member 31 backward by screw tightening is a predetermined amount. The screw length of the male screw 53 (screw length from the tip) is set to a predetermined length L1 so that the rotation at the time of screw tightening becomes idle, and the shaft portion (male screw) connected to the male screw 53 The outer diameter of the rear shaft portion 56, which is connected to, is made smaller than the diameter of the valley of the male screw 53 of the predetermined length portion L2. In other words, the length portion L2 of the shaft portion 56 whose outer diameter is equal to or less than the diameter of the valley of the male screw 53 is set as a necessary length that can be disengaged from the female screw (nut 35n) to obtain idling. It is made larger than the height of the nut 35n.

  In this example foundation pile 100, the taper member 31 is based on said structure, when the bolt 50 is screwed by the tool (not shown) inserted from the back of the pile main body member 11. The pile main body member 11 is drawn backward. By this drawing, the leading end 12 of the pile body member 11 is relatively pushed into the inside of the tapered pipe portion 34 formed by the dividing wall 34b from the rear end 33 or the rear end portion toward the front. That is, the wall 34w of the tapered pipe part 34 in the taper member 31 by the pushing by the pulling, that is, each divided wall 34b has a rear end 33 or an inner side part of the rear end, and the front end surface of the pile body member 11 And an outer peripheral surface (the outer peripheral surface of the pipe) 10a are pressed against a chamfer 17 provided at the corner (outer edge 13 of the square side) and receive outward or forward force (component forces) F1 and F2 ( (See FIGS. 5 and 6). Then, due to the force (external force), each of the dividing walls 34b is deformed so as to protrude outward from the outer edge 13 at the front end of the pile body member 11 with the rear end 33 as a free end. In this example, the case where the bolt support part 16 is provided at the tip of the pile body member 11 has been described. However, such a bolt support part 16 requires a long bolt but is behind the tip (for example, the tip). You may provide inside the pile main-body member 11 of a shift part.

  As is apparent from the above description, in the foundation pile 100 of this example, it can be embedded in the ground by driving in like a conventional simple pile made of pipe. Then, after the driving, by inserting a tool (for example, a screwing tool such as an electric impact wrench) from the upper opening of the pile main body member 11 and tightening the screw thereby, the tapered pipe portion in the taper member 31 is inserted. 34, that is, each divided wall 34b divided into a plurality of portions in the circumferential direction thereof can be deformed so as to project outward from the outer edge 13 at the tip 12 of the pile body member 11 (FIG. 5, (See FIGS. 6 and 7). And, by the spreading deformation of each dividing wall 34b, the settling resistance and the pullout resistance are improved. Thus, this example foundation pile 100 can be made into the foundation pile 100 which is excellent in sedimentation resistance and pull-out resistance, without incurring the complexity of a structure so that it may become clear from the structure. The amount of screw tightening may be set as appropriate so that the desired expansion deformation is obtained in the dividing wall 34b. In this example, the outer diameter of the shaft portion 56 at the rear of the male screw 53 is set to Since the diameter of the male screw 53 is not larger than the diameter of the valley of the male screw 53 over the predetermined length portion L2, the screw tightening is maximized with respect to the length L1 of the male screw from the tip, so that the rotation in the screw fastening is idle. Thereby, in this example, when the expansion deformation of the dividing wall 34b reaches a predetermined amount, the screw tightening operator can easily confirm that the predetermined deformation amount to be deformed can be secured by the occurrence of the idling. I can know. As a result, an appropriate and stable construction without variation in the amount of spread deformation by the operator is ensured. Note that the length L1 and the like of the male screw 53 may be set so as to obtain an appropriate spread deformation.

  And in this example, in drawing near the taper member 31, the wall 34w which makes the taper-shaped pipe part 34 faces toward the front from the rear end 33 or the rear end side part, and at the front end (part) 12 of the pile main body member 11. When pressed against the outer edge 13 or the vicinity of the outer edge, the spread deformation (plastic deformation) of the dividing wall 34b is facilitated by the formation of the chamfer 17 or the like. In the present invention, however, the tip of the pile main body member 11 is relatively pushed toward the inside of the tapered pipe portion 34 formed by the dividing wall 34b in the pulling operation, whereby the rear end 33 is moved to the free end. As long as the spread deformation protruding outward from the outer edge at the tip of the pile body member 11 is obtained. For this reason, even if there is no chamfering 17, for example, the rear end of the wall 34 w forming the tapered pipe portion 34 is positioned in advance (in the assembled state of the foundation pile 100) outside the outer edge 13 at the front end of the pile body member 11. It may be set as follows.

  Further, in this example, since the means for preventing the backward movement of the bolt 50 is provided as described above, the ground strength is higher than expected when the foundation pile 100 is driven into the ground, and the tapered pipe portion 34 is formed. Even when the strength of the wall 34w is relatively low, it is possible to prevent the wall 34w forming the tapered pipe portion 34 from being deformed in the driving process. That is, since the shaft portion 52 of the bolt 50 can also resist the driving force (up and down compression force), it is possible to prevent the wall 34w from being deformed during the driving process, and accordingly, the tapered pipe correspondingly. Since the wall of the site | part 34 can be made thin, screwing is facilitated.

  Next, another example in which the foundation pile of the present invention is embodied will be described with reference to FIG. However, while the foundation pile 100 of the above example is the one in which the wall 34w forming the tapered pipe portion 34 is divided into a plurality of division walls 34b in advance, the foundation pile 200 of this example is tapered. The wall 34w that forms the pipe portion 34 is not a divided wall that is divided into a plurality of parts in advance, and receives the outward or forward forces F1 and F2 as described above, and thus from the rear end 33. Break along the virtual cutting line so that the predetermined range toward the front is broken along the virtual cutting line in the front-rear direction at a plurality of locations in the circumferential direction of the foundation pile 200 itself to become a divided wall divided into a plurality of parts. The difference is only in that an easy means is provided, and the other points are the same as in the above example. Therefore, the same or corresponding parts as those in the above example are given the same reference numerals, and only the differences will be described.

  That is, in this example, the wall 34w that forms the tapered pipe portion 34 is subjected to a predetermined range from the rear end 33 toward the front by receiving the outward force F1 or F2 in the outward direction (in this example, the entire length of the wall 34w). ) At a plurality of locations in the circumferential direction of the foundation pile 200 itself (in this example, a corner having a square cross section or in the vicinity of the corner) so as to be divided along a virtual cutting line in the front-rear direction to be divided into a plurality of divided walls. In addition, a means for easily breaking is provided along the virtual cutting line. Here, as a means for easily breaking, in this example, only a part (part) P1 of the rear end 33 portion of the wall 34w forming the tapered pipe portion 34 becomes an annular (square annular) wall continuous in the circumferential direction. On the other hand, it extends in the front-rear direction (vertically) along the virtual cutting line in the front-rear direction except for a part P1 of the rear end 33 part at four corners 34c having a square cross section or in the vicinity of the corner. A slit (cut) S is provided. That is, it can be said that the four adjacent partitions 34b in the previous example are partially connected at the rear end 33, and if the part (connected portion) P1 that is connected is extremely small, the partition wall is substantially divided. It can be said.

  In this example, the taper member 31 is pulled backward with respect to the pile main body member 11, so that the tip of the pile main body member 11 is relatively located behind the rear end 33 or the rear end inside the tapered pipe portion 34. The wall 34w forming the tapered pipe portion 34 receives an outward force or a forward force, and is provided along a virtual cutting line in the circumferential direction. At the position of the slit (easy breakage means) S, the connecting portion P1 at the rear end is broken to form a plurality of divided walls. Each of the dividing walls is deformed so as to protrude outward from the outer edge 13 at the front end of the pile body member 11 with the rear end 33 as a free end.

  In this example, since the predetermined range part which goes ahead from the rear end 33 of the wall 34w is not cut and divided in advance, assembling as the foundation pile 200 and its transport process, or into the ground Problems such as unintentional deformation of the wall 34w due to external forces received during the driving process or the like can be solved. It should be noted that the connecting portion in the circumferential direction at the rear end 33 of the wall 34w has an appropriate force (screw tightening torque) so that the outer wall can be deformed outwardly by the screw tightening after being driven into the ground. ) Should be set to such a low strength that it can be broken. As will be understood from this, in this example, as in the foundation pile in FIG. 1, the rear end 33 portion of the adjacent divided walls 34b is broken with an appropriate external force in what is previously divided walls. It can also be embodied by temporarily welding as shown in FIG. Further, the breakable means is the outer peripheral surface (or inner peripheral surface) of the wall 34w along the virtual cutting line in the front-rear direction at the corner 34c having a square cross section in the wall 34w forming the tapered pipe portion 34 or in the vicinity of the corner. In addition, a groove extending along the front-rear direction may be used, and the wall thickness of the groove bottom may be minute. This is because it is sufficient that the groove bottom can be divided in the circumferential direction by screw tightening. Therefore, such a groove and a slit may be combined before and after.

  In addition, in the tapered member 31 of the cross-sectional angle pipe structure as in each of the above examples, when dividing the wall 34w in the circumferential direction of the foundation pile itself, or when providing easy breakage means (slits etc.) as in the above example, In the above example, the cross section is symmetrical with respect to the line and divided or easily broken (such as slits) are provided. However, the present invention is not limited to these and can be modified as appropriate. For example, as shown in FIG. 9, it is good also as dividing | segmenting into a division wall in contrast with a cross section, or providing a fracture | rupture easy means (slit S). In FIG. 9, the arrangement is in the vicinity of the corner 34c.

  In each of the above examples, the pile body member 11 has a square pipe structure, and the tapered pipe portion 34 in the taper member 31 has a shape of a pyramid or a truncated pyramid with the distal end of the pile body member 11 as a base end. However, the cross section is not limited to a rectangular shape, but may be any other polygonal shape or a circular shape. When the polygon is divided at the corner in the circumferential direction, the larger the number of corners, the larger the dividing wall. Moreover, it is good also as the pile main body member 11 which a cross section becomes circular, and it is good also considering the taper member 31 as a cone or a truncated cone shape. After the foundation pile of the present invention is driven into the ground, the pile body member and the tapered member are restrained by earth pressure in the ground. And if these cross sections are square structures, such as a square, also in screw fastening, it is not usual that a taper member rotates so that it may turn around the axis with respect to a pile main-body member, and what is called a rotation is produced. . However, in the case of such a rotation, it is only necessary to provide a detent structure in which the taper member does not rotate around its axis with respect to the pile body member in the screw tightening.

  Further, the present invention is not limited to those exemplified in the above embodiments. It is only necessary that the taper member can be pulled rearward by screw tightening with a tool inserted from the rear end side (rear) opening into the pile main body, and can be deformed outwardly as a dividing wall. The specifications of the tapered pipe part (taper) that forms the tapered member, its diameter (diameter and thickness), wall thickness, length, etc., are the weight of the base to be supported as the foundation pile. It may be appropriately selected according to the strength of the ground used and the like.

10 Pile body 10a Peripheral surface of pile body (peripheral surface of pipe)
DESCRIPTION OF SYMBOLS 11 Pile main-body member 12 The front-end | tip of a pile main-body member 13 The outer edge 15 in the front-end | tip of a pile main-body member Through part 16 Bolt support part 17 Chamfer 30 Tapered part 31 Tapered member 33 The rear end 34 of a wall (partition wall) Tapered pipe part 34s Tapered Pipe part tip 34w Wall 34b which forms tapered pipe part Divided wall 34c Corner 35 of cross section Tip part 35a Tip member
35n nut (screw hole at the tip)
50 Bolt 53 Shaft male screw 52 Bolt shaft 100 Base pile Hs Predetermined range Lk Virtual cutting line F1 Outward force F2 Forward force S Slit (easy to break)
L1 Thread length of male screw L2 Predetermined length at the shaft connected to male screw

Claims (7)

A foundation pile comprising a tapered portion formed in a tapered pipe shape at the tip of a pipe-shaped pile body,
The pile body member forming the pile body portion and the tapered member forming the tapered portion are formed separately,
The tapered member includes a tapered pipe portion and a tip portion provided at the tip thereof, and is provided at the tip of the pile body member.
The wall that forms the tapered pipe part has a plurality of divided walls divided into a plurality along a virtual cutting line in the front-rear direction at a plurality of predetermined ranges in the circumferential direction of the foundation pile itself from the rear end to the front. ,
When the tapered member is pulled backward with respect to the pile body member, the tip of the pile body member is relatively positioned at the rear end or rear end portion inside the tapered pipe portion formed by the dividing wall. Will be pushed toward the other side,
Due to the outward force or the forward force that the dividing wall receives by being pushed in, each of the dividing walls is deformed so as to protrude outward from the outer edge at the front end of the pile body member with the rear end as a free end. The taper member is provided at the tip of the pile body member;
Moreover, the tip portion of the tapered member is provided with a screw hole penetrating the tip,
The pile body member includes a bolt support portion provided with a penetrating portion that passes the shaft portion of the bolt forward and backward at the tip or inside thereof, and the bolt is passed through the penetrating portion, and The male screw of the shaft portion is screwed into the female screw of the screw hole at the tip portion, and the bolt is screwed with a tool inserted from the rear of the pile body member, A foundation pile formed by connecting the tapered members with a screw structure that can be pulled backward. A foundation pile comprising a tapered portion formed in a tapered pipe shape at the tip of a pipe-shaped pile body,
The pile body member forming the pile body portion and the tapered member forming the tapered portion are formed separately,
The tapered member includes a tapered pipe portion and a tip portion provided at the tip thereof, and is provided at the tip of the pile body member.
The wall forming the tapered pipe portion is subjected to an outward or forward force, so that a predetermined range from the rear end toward the front is a plurality of locations in the circumferential direction of the foundation pile itself, and a virtual cutting line in the front-rear direction. It is provided with easy break means along the virtual cutting line so as to be divided into a plurality of divided walls that are broken along
When the tapered member is pulled backward with respect to the pile main body member, the tip of the pile main body member is relatively directed toward the front from the rear end or the rear end portion inside the tapered pipe portion. Will be pushed,
The wall that forms the tapered pipe portion is subjected to an outward force or a forward force by being pushed in, and is broken along the virtual cutting line to form a plurality of divided walls. The taper member is provided at the tip of the pile body member so that the end is a free end and is deformed so as to project outward from the outer edge at the tip of the pile body member,
Moreover, the tip portion of the tapered member is provided with a screw hole penetrating the tip,
The pile body member includes a bolt support portion provided with a penetrating portion that passes the shaft portion of the bolt forward and backward at the tip or inside thereof, and the bolt is passed through the penetrating portion, and The male screw of the shaft portion is screwed into the female screw of the screw hole at the tip portion, and the bolt is screwed with a tool inserted from the rear of the pile body member, A foundation pile formed by connecting the tapered members with a screw structure that can be pulled backward.   The pile body member has a square pipe structure, and the tapered pipe portion in the tapered member is formed in a shape of a pyramid or a truncated pyramid having a distal end of the pile body member as a base end, and the tip of the pile body member. 2. The foundation pile according to claim 1, wherein the foundation pile is provided and divided at a corner of the cross section in the shape of the pyramid or the truncated pyramid or in the vicinity of the corner.   The pile body member has a square pipe structure, and the tapered pipe portion in the tapered member is formed in a shape of a pyramid or a truncated pyramid having a distal end of the pile body member as a base end, and the tip of the pile body member. The foundation pile according to claim 2, wherein the breakable means is provided at a corner of the cross section in the shape of the pyramid or the truncated pyramid or in the vicinity of the corner.   The foundation pile according to any one of claims 1 to 4, wherein the bolt is restricted from moving backward relative to the bolt support portion.   A chamfer is formed at an angle formed by the tip-oriented surface near the tip of the pile body member or the outer peripheral surface of the pile body member, and the rear end of the tapered pipe portion in the taper member, or The foundation pile according to any one of claims 1 to 5, wherein a portion closer to the inner surface of the rear end is held in contact with or close to the chamfer.   The screw length of the male screw is set to a predetermined length so that the rotation in the screw tightening is idle when the amount of pulling backward of the tapered member by the screw tightening becomes a predetermined amount, The foundation pile according to any one of claims 1 to 6, wherein 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. .

Images