JP3204956U - Pile foundation - Google Patents

Abstract

An object of the present invention is to provide a metal pipe body for a pile foundation that can be shortened in work and is buried in the ground having an excellent supporting force. A pile foundation buried in the ground, wherein a part of the foundation pile is a metal pipe body 200, and a pile outer diameter on the pile head side of the metal pipe body 200 is a pile on the pile tail side. The two piles 100 larger than the outer diameter are joined in the longitudinal direction of the pile, and a movable ring 20 having an inner diameter smaller than the diameter of the pile head is provided on the side of the pile outer periphery on the pile tail side. It is provided at the tip of the pile, and the lower surface of the ring is provided with a plurality of blades 40 and a blade 40 provided with a support shaft 31 and a support bearing portion 30 that allow the metal pipe body 200 to expand in the radial direction. To do. [Selection] Figure 1

Description

The present invention is a ground bite type support pile component used for the foundation of structures.

The foundation pile is used for the purpose of fixing the building to the ground, and is intended to prevent the building from sinking or laterally moving due to vertical loads such as its own weight or earthquakes. There are two types of foundation pile construction methods: the existing pile construction method and the cast-in-place pile construction method, and the construction methods differ depending on the ground, obstacles in the ground, and other surrounding conditions.

JP 2005-61171 A JP 2004-324321 A JP2015-101952A JP2015-68089A

In order to increase the resistance against horizontal load, increasing the pile diameter is uneconomical because more materials are used for the pile foundation, and various inventions have been proposed.

Patent Document 1 is characterized by providing a vertical plate that protrudes radially from the pile head of the pile foundation embedded in the ground, and can increase the effective stress in the horizontal direction received from the soil particles of the ground. The resistance against the horizontal load acting on the pile can be increased. However, after inserting the pile into the soil, it is necessary to make a vertical plate project from the slit into the ground using a hydraulic jack or the like, and the vertical plate has the present invention at the pile head (deep position in the ground). In such a case, the projecting operation becomes more difficult.

Patent Document 2 discloses a hollow pile body and a plurality of locations in the longitudinal direction of the hollow pile body that are opened in a square from the inside to the outside, and the lower edge portion is an obliquely inclined downward surface, and the left and right sides on both sides of the obliquely downwardly inclined surface. A plurality of guide holes that form walls, a mandrel that hangs down vertically along the central axis of the hollow pile body, and a grooved steel that pivotally connects the base end to the mandrel is cut into a rectangle and formed The lower end portion of the enlarged diameter arm is placed on a slanting downward inclined surface of the lower edge portion of the guide hole, and the enlarged diameter arm is formed from a guide hole provided on the outer periphery of the pile. There has been proposed a friction pile that protrudes when the mandrel descends, retracts when the mandrel rises, and allows diameter expansion. However, since the friction pile is provided with a plurality of diameter-expanding arms on the mandrel, the manufacturing cost is high because machining accuracy is required.

In Patent Literature 3, a threaded steel rod is used as a core material for bundling a plurality of uniform branch reinforcing bar branches and the branch reinforcing bar branches in a steel round pipe pile as a parent pile, and the outer surface of the top of the head is cut. A plurality of branched reinforcing bar piles are bundled together with their cores with wire ropes, and the inner wall directly below the bundling part of the branched piles that are bundled with threaded steel rods of the core material, with holes on the circumferential wall engraved The grooving process is performed to fit into the bottom wall plate of the edge of the branch pile hole engraved in the focusing pipe, the branch pile set bound to the core material is inserted into the focusing pipe, and the notch groove is passed through the branch pile through hole. Has been proposed in which the converging part of the branch pile device is tightened and the width of both sides of the concentrating pipe branch pile engraved hole is cut vertically. However, in this structure, there is a problem of workability for expanding the branch reinforcing bar branch.

Patent document 4 is provided in a tubular metal tube formed in a tubular shape, a plurality of slits provided upward from the lower end of the tube, and a spread piece and a spread piece positioned between the slits. A spreading portion having a metal receiving portion projecting in the axial direction of the tubular body in the body, and a shielding portion that shields the opening on the lower end side of the tubular body communicating with the tubular body is the widened portion Is provided. A pile construction method using a pile, which includes a driving step of driving the pile to a predetermined depth of the ground, and a spreading step of driving a pin into the pipe body to widen the spreading piece. However, there is a problem of workability because it is necessary to drive a pin for expanding the spread piece.

In view of the above problems, the inventor has found a pile structure having excellent supporting force as a result of sincerity. As a first embodiment, it is a pile foundation buried in the ground, a part of the foundation pile is a metal pipe, and a pipe body on the pile head side and a pile tail side of the metal pipe body The pipe body is joined in the pile longitudinal direction, the pipe outer diameter on the pile head side is larger than the pipe outer diameter on the pile tail side, and the pipe on the outer side of the pipe body on the pile tail side A movable ring having an inner diameter smaller than the outer diameter of the body is provided at the tube tip on the pile tail side, and a plurality of support bearing portions are fixed to the lower surface of the ring, and the support bearing portion includes a blade and a cutting tool. A support shaft that enables rotation is provided.

When the ring descends toward the pile head side, the blade is structured to expand in the radial direction of the metal tube, and the cutting edge of the blade is curved or shaped to facilitate the expansion of the blade. Inclined shape, curved shape so that the cutting edge of the blade can be easily expanded on the side of the metal pipe on the pile tail side at the joint between the metal pipe on the pile tail side and the metal pipe on the pile head side Alternatively, it has an inclined shape.

As a second embodiment, a pile foundation buried in the ground, wherein a part of the foundation pile is a metal pipe, and a pipe body on the pile head side and a pile tail side of the metal pipe body The pipe body is joined in the pile longitudinal direction, the pipe outer diameter on the pile head side is larger than the pipe outer diameter on the pile tail side, and the pipe on the outer side of the pipe body on the pile tail side A movable ring having an inner diameter smaller than the outer diameter of the body is provided at the tip of the tube body on the pile tail side, a plurality of support bearing portions are fixed to the lower surface of the ring, and the support bearing portion includes a column and a support column. A support shaft that enables rotation is provided, and a plurality of support bearing portions are also fixed in the vicinity of the joint portion of the metal tube body. The support shaft includes a support shaft that enables rotation of the support column and the support column. Provided so that the tip of the column provided on the ring and the column tip provided near the joint can be rotated. It is connected by lifting shaft and the support bearing part.

Although not shown, a metal wire is attached in a state where there is a slack in an adjacent blade or an adjacent support, and when the blade is expanded, the metal wire is in the circumferential direction of the metal tube body. I try to stretch it.

Two or more metal pipes for the pile foundation are provided in one pile foundation, and the outer diameter of the ring included in the pile foundation part located on the pile tail side of the pile foundation is a pile foundation pile. It is smaller than the outer diameter of the ring provided in the metal pipe body for pile foundations located on the head side.

According to the present invention, not only has an excellent holding force, but also the workability is good, so the construction period can be shortened.

The component cross-section figure of the pile foundation of this invention is shown. It is a top view of the component of the pile foundation of this invention, and shows the temporary stop condition of a ring. The attachment state of the cutter of the ring lower surface part of this invention is shown. The attachment state of the blade which enables expansion of this invention is shown. The state which the wire was fixed to all the cutters and the said cutter expanded was shown. The expansion method of the present invention and the expanded state are shown. The state which attached two parts of the pile foundation of this invention is shown. 2 shows a second embodiment of the present invention. The expansion method by 2nd embodiment of this invention and the state expanded are shown.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a cross section of a metal pipe body for a pile foundation which is an embodiment of the present invention. The pile component of the present invention is a metal pipe body, and the outer diameter of the pile head side pile (200) of the metal pipe body is larger than the outer diameter of the pile tail side pile (100). A pile is joined in the pile longitudinal direction, and a vertically movable ring (20) having an inner diameter smaller than the pile (100) diameter on the pile head side is piled on the outer peripheral side surface of the pile (100) on the pile tail side. Provided at the tip of the tail-side pile (100), a plurality of blades (40) on the lower surface of the ring (20) and the blade (40) can be expanded in the radial direction of the metal tube. The support shaft (31) for carrying out and the said support bearing part (30) are provided, and the said blade (40) expands to radial direction because the said ring (20) descend | falls toward the said pile head side. Further, the blade (40) has a curved structure at the cutting edge so that it can be easily expanded, and a joint of the metal pipe (100) on the pile tail side and the metal pipe (200) on the pile head side The side surface (10) is also curved.

FIG. 2 shows a top view of the pile (100) on the pile tail side. In order to temporarily fix the ring (20) to the tip of the pile tail side pile (100), the pile tail side pile (100) and the ring (20) are temporarily fixed by welding. It is possible to prevent the blade from spreading due to the ring effect during transportation and pile embedding work. Alternatively, although not shown, it is also possible to wrap the blade (40) around the metal tube side surface with a wire or the like.

FIG. 3 shows a state in which the blade (40) is attached to the lower surface of the ring (20). As shown in FIG. 4, the ring (20) has a hole on the side surface of the blade (40) so that the ring (20) can be expanded in the pile radial direction, and a support shaft (31) is passed through the hole. A support bearing portion (30) is provided at both ends so as to sandwich the blade (40), and the support bearing portion (30) is fixed to the lower surface of the ring (20).

Although not shown, a metal wire is attached in a state where the adjacent blade has a slack, and when the blade (40) is expanded, the metal wire is stretched in the circumferential direction of the metal tube. I am doing so. FIG. 5 shows a metal first wire (70), a second wire (71) and a third wire (72) fixed to the surface of all adjacent blades (40) by welding or the like. 40), the metal wire is structured to be stretched in the circumferential direction of the metal tube. Thereby, when the pile foundation is poured into the ground and the concrete is poured, the concrete is also solidified in the metal wire, so that the strength is increased.

In order to expand the blade (40), if the cylinder (300) is pushed in by a heavy machine or the like attached with a ring pushing cylinder (300) from the tip of the metal pipe on the pile tail side as shown in FIG. The stop portion (50) is released, the ring (20) is lowered, and the blade (40) is expanded. FIG. 7 shows two pile foundation parts of the present invention mounted on one pile foundation. The outer diameter of the second ring (21) provided on the pile foundation part of the present invention mounted on the pile head side of the foundation pile is the ring provided on the pile foundation part of the present invention mounted on the pile tail side of the pile foundation. It is larger than the outer diameter of (20), and the second ring is provided with a second cutter (41) as in the case of the ring (20).

A second embodiment of the present invention is shown in FIG. The pile component of the present invention is a metal pipe body, and the outer diameter of the pile head side pile (200) of the metal pipe body is larger than the outer diameter of the pile tail side pile (100). A pile is joined in the pile longitudinal direction, and a vertically movable ring (20) having an inner diameter smaller than the pile (100) diameter on the pile head side is piled on the outer peripheral side surface of the pile (100) on the pile tail side. Provided at the tip of the tail-side pile (100), a plurality of struts (45) on the lower surface of the ring (20) and the strut (45) can be expanded in the radial direction of the metal tube The support shaft (31) and the support bearing portion (30) are provided, and a plurality of support bearing portions (32) are also fixed in the vicinity of the joint portion of the metal tube, and the support bearing portion (32) A support shaft (33) capable of rotating the support column (46) and the support column is provided, and the support provided in the ring (20) is provided. (45) strut (46) tip tip and equipped near the junction are connected by the support shaft so as to be rotatable (36) and the supporting bearing unit (35).

As shown in FIG. 9, when the ring (20) descends toward the pile head side, the strut (45) expands in the radial direction and at the same time the strut (46) expands. Although not shown, the strength is further improved by attaching a metal wire to the column (45) and the column (46).

In addition, the specific structure of the pile concerning this invention is not restricted to the following embodiment, It can change in the range which does not deviate from the summary of invention. Specifically, the cutting edge length can be increased in order to change the cutting edge shape and strengthen the holding force.

DESCRIPTION OF SYMBOLS 10 Side surface of the joint part of the pile foundation on the pile tail side and the pile foundation on the pile head side Ring 21 Second ring 30 Support bearing part 31 Support shaft 32 Support bearing part 33 Support shaft 35 Support bearing part 36 Support shaft 40 Blade 41 The blade 45 provided in the second ring 45 The support 46 The support 50 The temporary support 60 The support 61 provided in the ring The support 70 provided near the joined portion The first wire 71 The second wire 72 The third wire 100 Metal Pile foundation part 101 made of metal Pile foundation part 101 Metal pile foundation part 200 Pile foundation part 201 Metal pile head part 201 Pile foundation part 201 Pile foundation part Pile foundation part 300 on the pile head side made of metal Ring ring cylinder

Claims (5)

A pile foundation buried in the ground, wherein a part of the foundation pile is a metal pipe, and a pipe body on a pile head side and a pipe body on a pile tail side of the metal pipe body are in a longitudinal direction of the pile. The outer diameter of the pipe body on the pile head side is larger than the outer diameter of the pipe body on the pile tail side, and the inner diameter smaller than the outer diameter of the pipe body on the pile head side And a movable ring having a plurality of support bearings fixed to the lower surface of the ring, and a support for enabling rotation of the cutter and the cutter on the support bearing. Metal pipe body for pile foundation characterized by having shaft In the joining region of the cutting edge of the cutter and the pipe body on the pile head side and the pipe body on the pile tail side, the pipe side surface on the pile tail side has a curved shape or an inclination with respect to the longitudinal direction of the pipe body. The metal pipe body of the pile foundation according to claim 1 characterized by things A pile foundation buried in the ground, wherein a part of the foundation pile is a metal pipe, and a pipe body on a pile head side and a pipe body on a pile tail side of the metal pipe body are in a longitudinal direction of the pile. The outer diameter of the pipe body on the pile head side is larger than the outer diameter of the pipe body on the pile tail side, and the inner diameter smaller than the outer diameter of the pipe body on the pile head side And a movable ring having a plurality of support bearings fixed to the lower surface of the ring, and a support and a support that allows the support to rotate. A shaft is provided, and a plurality of support bearing portions are also fixed in the vicinity of the joint portion of the metal tube body. The support bearing portion is provided with a support shaft and a support shaft that enables the support column to rotate, and the ring is provided. The support shaft and the support bearing portion are pivoted so that the tip end of the column and the column tip provided near the joint can rotate. Metallic tube body for pile foundation characterized in that it is connected A metal wire is attached in a state where the adjacent blade or the adjacent support is slack, and the metal wire is stretched in the circumferential direction of the metal tube when the blade or the support is expanded. Metal pipe body for pile foundation according to claim 1 and claim 3 characterized by the above-mentioned Two or more metal pipes for the pile foundation are provided in one pile foundation, and the outer diameter of the ring included in the pile foundation part located on the pile tail side of the pile foundation is a pile foundation pile. The pile foundation according to claim 1 or 3, wherein the pile foundation is smaller than the outer diameter of the ring provided in the metal pipe body for the pile foundation located on the head side.

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