JP3827710B1 - Construction method of ready-made piles and anchors - Google Patents

Abstract

In a ready-made pile in which a pile tip member is provided at the tip of a shaft tube, means for easily connecting the pile tip member to the tip of the shaft tube is provided.
A ready-made pile 1 includes a shaft tube 2 having a square cross-sectional outer shape in which a tip portion 20 is orthogonal to an axis 21, and a tube body 30 having a square cross-sectional shape that can be externally fitted to the tip portion 20 of the shaft tube 2. The pile plate member 3 in which the wing body 31 protrudes to the outside of the cylindrical body 30 and the support plate 5 that is locked to the proximal end 22 of the shaft tube 2 and fixed in the distal end direction while the sky is sealed. And the long volt | bolt 4 inserted in the inner space of the axial tube 2 and the cylinder 30 and fastening the pile tip member 3 and the support plate 5 is comprised.
[Selection] Figure 1

Description

  The present invention relates to a ready-made pile in which a pile tip member is provided at the tip of a shaft tube.

  Conventionally, as a pile for preventing the settlement of a structure, a steel pipe pile 90 in which a spiral blade 92 is provided on the outer periphery of a tip portion of a shaft pipe 91 is known, as shown in FIG. The steel pipe pile 90 is screwed into the ground while being rotated by a driving machine such as an earth auger installed on the ground, and is placed on the ground. Such a steel pipe pile 90 has the advantage that there is little noise and vibration at the time of placing and does not discharge earth and sand. Further, there is an advantage that the supporting force of the steel pipe pile 90 is increased by the spiral blade 92.

  The outer diameter of the spiral blade 92 provided on the steel pipe pile 90 is two to three times the outer diameter of the shaft pipe 91. When a plurality of steel pipe piles 90 are horizontally stacked and stored or transported, a gap is generated between the steel pipe piles 90 as much as the spiral blades 92 protrude, so there is a disadvantage that the loading efficiency is deteriorated.

  On the other hand, the structure which uses the front-end | tip part of the axial tube 91 in which the spiral blade 92 was provided as a pile tip member, and makes it a different member from the axial tube 91 is proposed. Since the pile tip member is not attached to the shaft tube 91 during storage and transportation, the loading efficiency of the shaft tube 91 is improved. The above-mentioned pile tip member is carried into the construction site separately from the shaft tube 91 and attached to the tip of the shaft tube 91 at the construction site.

  Conventionally, welding is used as a method of attaching a pile tip member to an axial tube. However, since the welding work requires a welder, there is a problem that the human cost is increased. In addition, there is a problem that the welding operation depends on the weather. On the other hand, a steel pipe pile capable of attaching a pile tip member to a shaft pipe with a simple work has been proposed.

  For example, as shown in FIG. 13, a reduced diameter portion 95 that can be inserted into the tip of the shaft tube 94 is formed on the top of the pile tip member 93. A through hole 96 in the busbar direction is formed in the reduced diameter portion 95. A through hole 97 corresponding to the through hole 96 is also formed in the shaft tube 94. The pile tip member 93 is fitted into the tip of the shaft tube 94, and the fastener 98 is inserted so as to communicate with the through holes 96 and 97, whereby the pile tip member 93 and the shaft tube 94 are fixed. (See Patent Document 1).

  Although not shown in the drawing, instead of the through holes 96 and 97, male and female screws are formed on the inner peripheral surface of the tip of the shaft tube 94 and the outer peripheral surface of the reduced diameter portion 95, respectively. A configuration has been proposed in which the reduced diameter portion 95 is screwed to the tip of the tube 94 and the pile tip member 93 is fixed (see Patent Document 2).

Japanese Patent Application No. 2003-27468 JP 2003-27464 A

  However, in the connection structure shown in FIG. 13, the rotational force of the shaft tube 94 is transmitted to the pile tip member 93 via the fastener 98, so that when the pile is driven, a large shearing force is applied to the fastener 98. Will be added. Therefore, for example, the fastener 98 may be damaged by an impact when the pile tip member 93 comes into contact with a stone or the like in the ground. If the pile tip member 93 is already in the ground, it is difficult to confirm the breakage of the fastener 98. Further, even if the pile is reversed and pulled out, the rotational force is not transmitted to the pile tip member 93, and the pile tip member 93 may remain in the ground.

  In the configuration in which the pile tip member 93 is screwed to the shaft tube 94, for example, when the shaft tube 94 is rotated in a direction opposite to the direction in which the pile tip member 93 is screwed in order to pull the ready-made pile once, The pile tip member 93 that has received resistance such as earth and sand in the ground may be stationary with respect to the shaft tube 94 rotated in the opposite direction, and the pile tip member 93 may be detached from the shaft tube 94.

  By the way, after the steel pipe pile 90 is driven into the ground, as shown in FIG. 14, the foundation 99 is driven on the upper side of the steel pipe pile 90, and the house 100 is constructed on the foundation 99. The load of the house 100 is supported by the foundation 99, and the load on the foundation 99 is supported by the underground support layer through the steel pipe pile 90. That is, the steel pipe pile 90 bears the compressive force from the foundation 99 and the house 100. However, an upward force by wind force may act on the house 100 in addition to a downward load such as its own weight or a snow load. For such upward force, the weight of the foundation 99 and the house 100 and the bending resistance of the foundation 99 are used as reaction forces. In order to obtain a large dead weight, the cross-sectional area of the foundation 99 is enlarged, and in order to obtain a large bending resistance, the reinforcing bars of the foundation 99 are increased.

  The present invention has been made in view of such circumstances, and in a ready-made pile in which a pile tip member is provided at the tip of the shaft tube, means for easily connecting the pile tip member to the tip of the shaft tube is provided. The purpose is to provide.

  Another object of the present invention is to provide means for reliably transmitting rotation from a shaft pipe to a pile tip member.

  Moreover, the other objective of this invention is to provide the ready-made pile which can bear a drawing-out force.

(1) The ready-made pile according to the present invention has an axial tube having a polygonal cross-sectional outer shape orthogonal to the axis at least at the tip portion, and an inner space of a polygonal cylindrical body that can be fitted to the tip portion of the shaft tube. A pile tip member that is sealed and has a wing body projected to the outside of the cylindrical body, a support member that is locked to the proximal end of the shaft tube and fixed in the distal direction, the shaft tube, and A fastening member that is inserted into the inner space of the cylindrical body and fastens the pile tip member and the support member, and rotation of the shaft tube is transmitted to the pile tip member via a fitting shape. together with the shaft tube Kuisaki member is shall be rotated.

  The cylindrical body that is externally fitted to the distal end portion of the axial tube is transmitted with rotation by matching the polygonal shape of each other. Therefore, when the base pile side of the shaft tube is rotated when the ready-made pile is driven, the rotational force is transmitted to the cylindrical body, and the wing body is rotated together with the cylindrical body. The fastening member fastens the pile tip member and the support member locked to the proximal end of the shaft tube. This prevents the pile tip member from falling off the shaft tube.

  (2) The pile tip member is preferably one in which a flat plate material forming the wing body is fixed so as to seal the tip of the cylindrical body. Thereby, a pile tip member is realized with a simple structure.

  (3) It is preferable that the flat plate member is provided with a fixing bolt that protrudes into the inner space of the cylindrical body, and the fastening member has a nut portion that is screwed to the fixing bolt on the distal end side. Thereby, a coupling | bonding with a pile tip member and a fastening member is made | formed easily.

  (4) The fastening member may be connected to a reinforcing bar embedded in a foundation supported by a ready-made pile. Thereby, a ready-made pile not only bears the compressive force from a foundation but will also bear the extraction force which acts on a foundation.

(5) Further, the anchor construction method according to the present invention includes a placing step for placing the ready-made pile in the ground, a filling step for removing the support member and filling the shaft tube with a solidified material, A curing step of drawing the shaft tube and solidifying the solidified material around the fastening member and inside the pile tip member .

  The ready-made pile is driven into the ground while being rotated by heavy machinery. When the support member is removed from the shaft pipe of the ready-made pile that has been cast, the solidified material can be filled into the inner space of the shaft pipe. As the solidifying material, for example, a cement-based solidifying material is used. After leaving a part of the upper end of the fastening member exposed to the ground surface, the shaft tube is filled with a solidifying material, and then the shaft tube is pulled out. Since the fastening between the shaft tube and the pile tip member is released by removing the support member, only the shaft tube is pulled out from the ground, and the pile tip member remains in the ground in a state of being coupled with the fastening member. . Thereafter, by curing, the solidified material is solidified with moisture in the ground. Thereafter, the fastening member can be used as an anchor.

According to the ready-made pile according to the present invention, the shaft pipe and the cylinder of the pile tip member are fitted together, and the fastening member fastens the pile tip member and the support member locked to the proximal end of the shaft pipe. The pile tip member can be easily connected to the pipe. In addition, when the polygonal shapes of the shaft pipe and the pile tip member are matched, rotation transmission from the shaft pipe to the pile tip member is reliably performed. Further, since the fastening member is not involved in this rotation transmission, no shear stress acts on the fastening member. On the other hand, since the fastening member restrains the shaft tube and the pile tip member with respect to the drawing direction of the ready-made pile, the pile tip is prevented from falling off and the pile once placed can be pulled out.

  Embodiments of the present invention will be described below with reference to the drawings as appropriate. In addition, this embodiment is only an example of this invention, and it cannot be overemphasized that embodiment can be changed suitably in the range which does not change the summary of this invention.

  FIG. 1 is a perspective view showing a ready-made pile 1 according to an embodiment of the present invention. In FIG. 1, the intermediate portion in the length direction of the shaft tube 2 is partially cut away. The ready-made pile 1 includes a pile tip member 3 connected to a tip portion 20 of a shaft tube 2. The shaft tube 2 and the pile tip member 3 are configured as separate members and can be easily attached at a construction site. Therefore, even when the shaft tube 2 and the pile tip member 3 are manufactured in different factories, it is not necessary to perform final assembly as the ready-made pile 1 in any factory or the like. 3 can be directly carried into the construction site from each manufacturing factory or storage location and assembled at the construction site. Further, since the shaft tube 2 does not have a member protruding from the outer peripheral surface, the loading efficiency is good when the plurality of shaft tubes 2 are loaded and transported on a truck bed or the like.

  The shaft tube 2 is a steel tube having a square cross-sectional shape orthogonal to the axis 21. The length of the axial tube 2 in the direction of the axis line 21 is not particularly limited. For example, when the ready-made pile 1 is used to support the foundation of a house, a length of about several meters to 20 meters is used. The number of the axial tubes 2 may be one or several may be joined on the axis 21. The external dimensions and thickness of the shaft tube 2 are not particularly limited. For example, when the ready-made pile 1 is used to support the foundation of a house, the thickness is about 10 centimeters to several tens of centimeters on one side. However, a few millimeters are used. It is preferable to use a square pipe that is commercially available for general purposes as the shaft tube 2 because of cost and easy procurement.

  The tip portion 20 of the shaft tube 2 is a portion that is fitted into the pile tip member 3. The cross-sectional outline perpendicular to the axis 21 of the tip portion 20 is a square. In the present embodiment, the shaft tube 2 is a steel tube having a square cross-sectional shape orthogonal to the axis line 21 in the length direction. However, in the present invention, the entire cross-sectional shape of the shaft tube needs to be a constant shape. However, it is sufficient that at least the cross-sectional outer shape of the tip portion is a polygon. Further, in the present invention, the cross-sectional outer shape is not limited to a cross-sectional shape that is square like the axial tube 2, and the maximum outer shape formed by the cross-sectional shape may be a polygon. In the present invention, the polygon is not limited to a square like the cross-sectional outline of the shaft tube 2, and includes, for example, a rectangle such as a rectangle or a rhombus, a triangle, a hexagon, and the like. Of course, the cross-sectional inner shape of the cylindrical body, that is, the cross-sectional shape formed by the inner peripheral surface of the cylindrical body is also the same. The

FIG. 2 is a plan view showing the wing body 31 of the pile tip member 3. FIG. 3 is an enlarged front view of the ready-made pile 1 in the vicinity of the pile tip member 3. In addition, in FIG. 3, the internal structure of the axial tube 2 is shown with the broken line. The pile tip member 3 includes a cylindrical body 30 that is externally fitted to the distal end portion 20 of the axial tube 2 and a wing body 31 that protrudes outward from the cylindrical body 30 in a substantially horizontal direction.

  The cylindrical body 30 is a steel pipe having a square cross-sectional shape perpendicular to the axis 21. The size of one side of the inner shape of the cross section of the cylindrical body 30 is slightly larger than the size of one side of the outer periphery of the cross-sectional outer shape of the distal end portion 20 of the shaft tube 2, so It can be fitted. The dimensional difference between the outer periphery of the distal end portion 20 and the inner periphery of the cylindrical body 30 is that the cylindrical body 30 can be externally fitted to the distal end portion 20, and the cylindrical body 30 externally fitted to the distal end portion 20 is attached to the pile tip member 20. On the other hand, it is set so as not to idle. The length of the pile tip member 3 in the direction of the axis 21 is not particularly limited, and is preferably set so as to be light and small for easy attachment work. If the square pipe marketed for a general purpose is used as the pile tip member 3, it is suitable from a cost and easy procurement.

  The wing body 31 is fixed to the front end surface (lower surface) of the cylindrical body 30 so as to seal the inner space of the cylindrical body 30. The wing body 31 plays a role of propelling the ready-made pile 1 downward when the ready-made pile 1 is penetrated into the ground, and after the ready-made pile 1 is placed, the bearing capacity of the ready-made pile 1 Take on. As shown in FIG. 2, the wing body 31 has a through-hole 32 formed in the thickness direction in the center of an octagonal flat plate material, and a notch 33 having a predetermined shape formed from two opposing peripheral edges. is there.

  The two cuts 33 are symmetric with respect to the through hole 32. The notch 33 includes a first notch 34 formed from the peripheral edge toward the center and an L-shaped second notch 35 that surrounds the through hole 32 and is formed to match the cross-sectional shape of the cylindrical body 30. . In the wing body 31, both end portions divided by the first cut 34 are fold-folded or valley-folded from both ends of the second cut 35 toward the periphery. In FIG. 2, the mountain fold line is indicated by a broken line 36, and the valley fold line is indicated by a broken line 37. As shown in FIG. 1 and FIG. 3, the mountain-folded end 38 that has been folded at the broken line 36 protrudes obliquely downward from the pile tip member 3, and becomes an excavation claw. The valley-folded end 39 broken by the broken line 37 plays a role of propelling the ready-made pile 1 into the ground together with the mountain-folded end 38.

  As shown in FIG. 3, the wing body 31 having such a shape is welded and fixed to the tip of the cylindrical body 30 to seal the inner space of the cylindrical body 30. As a result, the wing body 31 serves as a lid for preventing earth and sand from entering the inner space of the shaft tube 2 and the pile tip member 3, and abuts against the tip portion 20 of the shaft tube 2 to form the cylindrical body 30. It plays the role of a receiving part that defines the insertion position of the shaft tube 2 with respect to. By performing such a plurality of roles by the wing body 31, the pile tip member 3 is realized with a simple structure.

  The wing body 31 prevents the earth and sand from entering the inner space of the shaft tube 2 and the pile tip member 3, so that the ready-made pile 1 is used using the inner space of the shaft tube 2 after placing the ready-made pile 1. Since the depth of the tip of the pile can be measured, it becomes easy to inspect the buried depth of the ready-made pile. In the present embodiment, the wing body 31 completely seals the inner space of the cylindrical body 30, but in the present invention, the sealing of the inner space of the cylindrical body by the wing body is from the cylindrical body 30. Any material that can prevent entry of earth and sand into the inner space of the shaft tube 2 may be used. That is, even if some gaps or slits are formed in the wing body 31, it is in a sealed state if dirt or the like does not enter from the gaps.

  A hook 40 for receiving the mountain-folded end 38 of the wing body 31 is fixed to the tip of the cylindrical body 30 by welding. The hook 40 reinforces the mountain break end 38 by supporting the mountain break end 38 from below. Such a hook 40 has an arbitrary configuration, and may not be provided if a desired strength is obtained at the mountain-folded end 38.

  As shown in FIG. 3, a fixing bolt 41 is inserted into the through-hole 32 of the wing body 31 from the lower surface side of the wing body 31 with the head portion on the lower side and the screw portion on the upper side. The fixing bolt 41 is provided by being screwed with the nut 42 on the side. The threaded portion of the fixing bolt 41 protrudes into the inner space of the cylindrical body 30, and this threaded portion is screwed into a long bolt 4 (fastening member) described later, whereby the pile tip member 3 and the long bolt 4 are combined.

  FIG. 4 is an exploded perspective view of the base end side of the ready-made pile 1. FIG. 5 is a cross-sectional view showing the internal configuration of the ready-made pile 1. As shown in FIGS. 1, 3, 4, and 5, a long bolt 4 extending in the direction of the axis 21 is provided in the inner space of the shaft tube 2 and the pile tip member 3. The long bolt 4 has a length substantially the same as the length of the shaft tube 2. As shown in FIGS. 3 and 5, a nut portion 43 is provided at the tip of the long bolt 4. The nut portion 43 is screwed with the fixing bolt 41. As shown in FIGS. 4 and 5, a screw portion 44 is formed at the base end of the long bolt 4. The screw portion 44 is a male screw and is screwed to the nut 45.

  As shown in FIGS. 4 and 5, a support plate 5 is provided at the base end 22 of the shaft tube 2. The support plate 5 is a square flat plate material equivalent to the cross-sectional shape of the shaft tube 2. The central portion 50 of the support plate 5 is recessed so as to be fitted into the inner space of the shaft tube 2, and the support plate 5 is formed in a concavo-convex shape between the central portion 50 and the peripheral portion 51, so It is locked to. A through hole 52 is formed in the center of the support plate 5 in the thickness direction. The threaded portion 44 of the long bolt 4 is inserted into the through hole 52. The long bolt 4 and the support plate 5 are coupled to each other by screwing the nut 45 into the screw portion 44 on the upper surface side of the support plate 5.

  Below, the assembly method of the ready-made pile 1 is demonstrated. As shown in FIG. 5, the cylindrical body 30 of the pile tip member 3 is fitted on the distal end portion 20 of the shaft tube 2. The pile tip member 3 is arranged such that the side on which the wing body 31 is fixed is the lower side. Since the cross-sectional outline of the outer shape of the tip portion 20 of the shaft tube 2 is a square, and the cross-sectional inner shape of the cylindrical body 30 of the pile tip member 3 is also a square, the external fitting is performed so that the four corners of each other are matched. This operation does not necessarily have to be performed with the axis 21 of the shaft tube 2 in the vertical direction. For example, the shaft tube 2 is placed on a work table or the like so that the axis 21 of the shaft tube 2 is substantially horizontal. May be.

  As shown in FIG. 5, the tip of the shaft tube 2 is inserted until it comes into contact with the wing body 31 of the pile tip member 3. In this state, the threaded portion of the fixing bolt 41 attached to the wing body 31 is visible from the base end 22 side of the shaft tube 2. The long bolt 4 is inserted into the inner space of the shaft tube 2 from the base end 22 side of the shaft tube 2. The long bolt 4 has the nut portion 43 on the lower side. Then, the nut portion 43 is screwed onto the fixing bolt 41. Thereby, the pile tip member 3 and the long volt | bolt 4 are couple | bonded.

  Subsequently, the support plate 5 is locked to the base end 22 of the shaft tube 2, and the screw portion 44 of the long bolt 4 is inserted into the through hole 52 of the support plate 5. Then, a nut 45 is screwed onto the screw portion 44 on the upper surface side of the support plate 5. Thereby, the long volt | bolt 4 and the support plate 5 are couple | bonded. The other of the long bolts is coupled to the pile tip member 3 as described above. That is, the long bolt 4 fastens the pile tip member 3 and the support plate 5. Since the pile tip member 3 and the support plate 5 are in contact with both end faces of the shaft tube 2, they are fixed together so that the shaft tube 2 is sandwiched between the pile tip member 3 and the support plate 5. It is set to 1. In this manner, the work of attaching the pile tip member 3 to the shaft tube 2 is easily performed at the construction site.

  Hereinafter, a method for placing the ready-made pile 1 will be described. FIG. 6 shows a state where the ready-made pile 1 is attached to the heavy machine 10. FIG. 7 shows a usage mode in which the house 12 is constructed on the upper side of the ready-made pile 1.

  As shown in FIG. 6, the ready-made pile 1 is attached to the rotational drive unit 11 of the heavy machine 10 with the pile tip member 3 facing downward. The rotational drive unit 11 receives a driving force such as hydraulic pressure and rotates the ready-made pile 1 and is movable in the vertical direction.

  For example, as shown in FIG. 7, when the ready-made pile 1 is driven in order to support the foundation 13 of the house 12, a plurality of ready-made piles 1 are driven at a predetermined position with respect to the construction position of the foundation 13. Established. The center position for placing the plurality of ready-made piles 1 is measured in advance and written on the ground with piles or nails. Accordingly, the heavy machine 10 is moved to the center position where the ready-made pile 1 is to be placed, and positioned so that the axis 21 of the ready-made pile 1 coincides with the center position.

  Moreover, since the pile tip member 3 is fastened with the support plate 5 by the long bolt 4, when attaching the ready-made pile 1 to the heavy machine 10, for positioning after attachment, etc., the ready-made pile 1 is made into the axis line 21. Even if it is the attitude | position which becomes vertical direction, the pile tip member 3 does not drop from the axial tube 2. FIG. In addition, the pile tip member 3 does not fall off the shaft tube 2 when the ready-made pile 1 penetrated into the ground is pulled out.

  After positioning the ready-made pile 1 in a predetermined position, the ready-made pile 1 is penetrated into the ground while being rotated by operating the rotation driving unit 11 of the heavy machine 10. Since the shaft tube 2 and the pile tip member 3 are fitted to each other in cross-sectional outer shape and cross-sectional inner shape, the shaft tube 2 does not idle with respect to the pile tip member 3. Therefore, when the shaft tube 2 is rotated by the rotation drive unit 11, the rotation is transmitted to the pile tip member 3 through the fitting shape, and the pile tip member 3 rotates together with the shaft tube 2. When the pile tip member 3 rotates, the wing body 31 provided on the outer periphery of the cylindrical body 30 rotates and penetrates into the ground. Therefore, the ready-made pile 1 is penetrated into the ground by the propulsive force of the wing body 31.

  The ready-made pile 1 is not only the propulsive force of the wing body 31 but also the pushing force in the vertical direction due to the lowering of the rotary drive unit 11 is applied to the shaft tube 2 and penetrates into the ground. This pushing force is directly transmitted from the tip of the shaft tube 2 to the wing body 31 as shown in FIG.

  The mountain bent end 38 of the wing body 31 serves as an excavation claw, so that when the ready-made pile 1 penetrates into the ground, the mountain bent end 38 repels the stones and the like in the ground by its rotation. Thereby, penetration of the ready-made pile 1 into the ground becomes smooth. In addition, when the ready-made pile 1 is penetrated into the ground, penetration resistance is generated at the mountain-folded end 38, and this penetration resistance is directly received by the shaft tube 2 from the wing body 31.

  And if the ready-made pile 1 penetrates to the predetermined depth, the rotation drive part 11 will be stopped and penetration will be complete | finished. As shown in FIG. 7, after the ready-made pile 1 is placed at a predetermined position, the load of the house 12 and the foundation 13 provided on the ready-made pile 1 is transferred from the tip portion 20 of the axial tube 2 to the pile tip member. 3 is transmitted. The wing body 31 of the pile tip member 3 gives support force to the ready-made pile 1 after the ready-made pile 1 is driven. Therefore, the load of the house 12 and the foundation 13 transmitted to the pile tip member 3 is supported by the wing body 31. Thereby, the settlement of the house 12 and the foundation 13 is prevented by the ready-made pile 1. Although not shown in FIG. 7, after placing the ready-made pile 1, in order to place the foundation 13, a support plate is removed from the ready-made pile 1, and a lid for supporting the foundation 13 is used instead. It is good also as providing in the base end 22 of the axial tube 2. As shown in FIG.

  Thus, according to the ready-made pile 1, the shaft tube 2 and the cylindrical body 30 of the pile tip member 3 are fitted together, and the long bolt 4 is locked to the base end 22 of the pile tip member 3 and the shaft tube 2. Since the support plate 5 is fastened, the pile tip member 3 can be easily connected to the shaft tube 2. Further, when the square cross-sectional shapes of the shaft tube 2 and the pile tip member 3 are matched, rotation transmission from the shaft tube 2 to the pile tip member 3 is reliably performed. Since the long bolt 4 is not involved in this rotation transmission, no shear stress or the like acts on the long bolt 4. Thereby, the ready-made pile 1 which the pile tip member 3 is simply connected to the front-end | tip part 20 of the axial tube 2 is implement | achieved. Moreover, the ready-made pile 1 transmitted reliably from the axial tube 2 to the pile tip member 3 is realized.

  Below, another construction example of the ready-made pile 1 is demonstrated. FIG. 8 is an enlarged cross-sectional view illustrating a configuration of a connection portion between the ready-made pile 1 and the foundation 13. As shown in FIG. 8, in the ready-made pile 1 placed in the ground, the long bolt 4 is connected to the reinforcing bar 14 of the foundation 13.

As described above, after the ready-made pile 1 is driven into the ground by the heavy machine 10, the nut 45 is removed from the screw portion 44 of the long bolt 4 on the upper surface side of the support plate 5. And the support plate 5 latched by the base end 22 of the axial tube 2 is removed. Ready-made pile 1 has already been Da設underground, Kuisaki member 3, since it is buried in the ground, even to remove the support plate 5, the Kuisaki member 3 is immediately removed from the shaft tube 2 There is no.

  When the support plate 5 is removed, the screw portion 44 of the long bolt 4 is exposed at the base end of the shaft tube 2. Then, the reinforcing bars 14 arranged on the foundation 13 are connected to the long bolts 4. The reinforcing bar 14 has a nut portion 15 on one end side, like the long bolt 4. By screwing the nut portion 15 into the screw portion 44 of the long bolt 4, the rebar 14 is connected so that the long bolt 4 extends upward. Then, in addition to the reinforcing bar 14, the foundation 13 is placed by placing the foundation 13. Thereby, the reinforcing bar 14 becomes the reinforcement of the foundation 13.

  Thus, by connecting the long bolt 4 with the reinforcing bar 14 embedded in the foundation 13 supported by the ready-made pile 1, the ready-made pile 1 not only bears the compressive force from the foundation 13, but also the foundation. The pulling force acting on 13 is also borne. That is, when a pulling force is applied to the foundation 13 when the house 12 receives wind or the like, the pulling force also acts on the reinforcing bars 14. The reinforcing bar 14 is connected to the long bolt 4, and the long bolt 4 is coupled to the wing body 31 of the pile tip member 3. Accordingly, the pulling force is transmitted to the wing body 31 via the long bolt 4, but the wing body 31 counters this. Thereby, the ready-made pile 1 bears the drawing-out force.

  Below, another construction example of the ready-made pile 1 is demonstrated. In this construction example, the ready-made pile 1 is used for construction of an anchor used for fixing a large signboard or a pole, preventing a slope from collapsing. 9 to 11 are cross-sectional views for explaining each process in the present construction example.

  FIG. 9 shows a state after the ready-made pile 1 is placed in the ground. The placement of the ready-made pile 1 is performed by the same method as described above. That is, the heavy machine 10 is used, and the ready-made pile 1 is penetrated into the ground while being rotated. This process corresponds to the placing process of the present invention.

Subsequently, as shown in FIG. 10, the support plate 5 is removed from the base end 22 of the axial pipe 2 of the already-made pile 1. The removal of the support plate 5 is the same as described above, and the nut 45 is removed from the threaded portion 44 of the long bolt 4, and then the support plate 5 is removed. By removing the support plate 5, the inner space of the shaft tube 2 is exposed to the ground surface together with the threaded portion 44 of the long bolt 4. The solidified material 6 is filled into the exposed inner space of the shaft tube 2. The solidifying material 6 may be, for example, a cement-based solidifying material, that is, a material in which aggregate, earth and sand, etc. are appropriately mixed with cement. The filling method of the solidified material 6 is not particularly limited, but the solidified material 6 may be poured into the inner space of the shaft tube 2 using a bucket 16 as shown in FIG. The solidified material 6 is filled in the inner space of the shaft tube 2 so that the vicinity of the screw portion 44 of the long bolt 4 is exposed to the ground surface. This step corresponds to the filling step of the present invention.

Subsequently, as shown in FIG. 11, the shaft tube 2 is pulled out from the ready-made pile 1 placed in the ground. Since the axial tube 2 is only fitted into the cylindrical body 30 of the pile tip member 3 and is in contact with the wing body 31, it is not fixed at all in the upward direction. Further, a gap corresponding to the rotation locus of the corner portion of the shaft tube 2 around the axis line 21 is formed around the shaft tube 2 . Therefore, there is little friction with the ground when the shaft tube 2 is pulled out. By pulling out the shaft tube 2, the solidified material 6 also flows out into the gap, and the solidified material 6 is filled in the penetration of the shaft tube 2. Then, it is cured for a predetermined period. During the curing period, the water in the ground permeates into the solidifying material 6, and the solidifying material 6 is solidified. Thereby, while the circumference | surroundings of the long volt | bolt 4 are fixed with the solidification material 6, the solidification material 6 is also solidified also in the inside of the pile tip member 3. FIG. This process corresponds to the curing process of the present invention.

  When the solidified material 6 is solidified, the pile tip member 3, the long bolt 4 and the solidified material 6 are integrated, and the wing body 31 of the pile tip member 3 opposes the pulling force of the long bolt 4. Accordingly, the long bolt 4 can be used as an anchor by connecting the base of the signboard to be fixed to the screw portion 44 of the long bolt 4 or connecting a flat plate material for fastening.

FIG. 1 is a perspective view showing a configuration of a ready-made pile 1 according to an embodiment of the present invention. FIG. 2 is a plan view showing the wing body 31. FIG. 3 is an enlarged front view showing the configuration near the pile tip member 3. FIG. 4 is an exploded perspective view showing a configuration in the vicinity of the base end 22 of the shaft tube 2. FIG. 5 is a cross-sectional view showing the internal configuration of the ready-made pile 1. FIG. 6 is a schematic diagram for explaining a construction method of the ready-made pile 1. FIG. 7 is a schematic diagram showing a construction example of the ready-made pile 1. FIG. 8 is a schematic diagram showing another construction example of the ready-made pile 1. FIG. 9 is a schematic diagram showing a placing process in still another construction example of the ready-made pile 1. FIG. 10 is a schematic diagram illustrating a filling process in still another construction example of the ready-made pile 1. FIG. 11 is a schematic diagram showing a curing process in yet another construction example of the ready-made pile 1. FIG. 12 is a front view showing a schematic configuration of a conventional steel pipe pile 90. FIG. 13 is an exploded view showing a schematic configuration of a conventional steel pipe pile from which the pile tip member 93 can be separated. FIG. 14 is a schematic diagram showing a construction example of a conventional ready-made pile 90.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Ready-made pile 2 ... Axle tube 3 ... Pile tip member 4 ... Long bolt (fastening member)
5 ... Support plate (support member)
DESCRIPTION OF SYMBOLS 13 ... Base 14 ... Rebar 20 ... Tip part 21 ... Axis 22 ... Base end 30 ... Cylindrical body 31 ... Wing body 41 ... Fixing bolt 43 ... Nut Part

Claims (5)

An axial tube having a polygonal cross-sectional outer shape at least at the tip portion orthogonal to the axis,
A pile tip member in which an inner space of a polygonal cylindrical body that can be externally fitted to the distal end portion of the axial tube is sealed, and a wing body is projected to the outside of the cylindrical body,
A support member that is locked to the distal end of the shaft tube and fixed to the distal direction;
A fastening member that is inserted into the inner space of the shaft tube and the tubular body and fastens the pile tip member and the support member ;
Ready-made pile rotation of the shaft tube is shall be rotated Kuisaki member with the shaft tube is transferred to the Kuisaki member through a fitting shape.   The ready-made pile according to claim 1, wherein the pile tip member is fixed so that a flat plate material forming the wing body seals the tip of the cylindrical body. The flat plate is provided with a fixing bolt that projects into the inner space of the cylindrical body,
The ready-made pile according to claim 2, wherein the fastening member has a nut portion screwed onto the fixing bolt at a distal end side.   The ready-made pile according to any one of claims 1 to 3, wherein the fastening member is connected to a reinforcing bar embedded in a foundation supported by the ready-made pile. A placing step of placing the ready-made pile according to any one of claims 1 to 3 in the ground;
A filling step of removing the support member and filling the solidified material into the shaft tube;
An anchor construction method comprising: drawing out the shaft tube, and curing the solidified material around the fastening member and inside the pile tip member .

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