JP3099166U - Spiral anchor pile - Google Patents

Abstract

A spiral anchor pile driven into a foundation as reinforcement of soft ground at a construction site is provided.
A spiral anchor pile according to the present invention includes spiral blades (3) wound at equal intervals around a peripheral surface buried in the ground of a steel pipe (1), and vertically adjacent to each other so as to avoid the spiral blades. A plurality of pin holes 4 formed by being shifted by 90 °, a short cylindrical support guide tube for guiding an anchor pin by welding to the opening edge of the pin hole, and slidably fitted to the support guide tube. An anchor pin protruding radially outward from the peripheral surface of the steel pipe pipe, and a tip of the leaf spring is provided in a stopper groove along an axial direction corresponding to the leaf spring of the support guide cylinder on a part of the outer peripheral surface of the anchor pin. Form engaging ridges. Further, the length of the spiral blade wound around the circumferential surface of the steel pipe is one pitch, and the interval between the spiral blades is ten pitches.
[Selection diagram] Fig. 1

Description

(4) The present invention relates to a spiral anchor pile comprising an anchor pin projecting radially outward from a peripheral surface of a steel pipe pipe driven into a foundation for reinforcing soft ground at a construction site, and a support guide tube for fixing the anchor pin.

2. Description of the Related Art Conventionally, at a construction site, a steel pipe is buried to reinforce soft ground, thereby reinforcing the ground.
However, in order to completely reinforce the soft ground, it was necessary to increase the diameter of the steel pipe or increase the length of the steel pipe. Problem had arisen.
Therefore, the present applicant has invented an anchor foundation pile for reinforcing soft ground by providing an anchor pin projecting radially outward from the peripheral surface of the steel pipe, and has filed an application as Japanese Patent Application Laid-Open No. 2002-138472.
However, it was found that the anchor pin projecting radially outward from the peripheral surface of the steel pipe was pushed back by the ground pressure.
JP-A-2002-138472

Accordingly, the present invention provides a spiral anchor pile comprising an anchor pin projecting radially outward from a peripheral surface of a steel pipe pipe driven into a foundation as reinforcement of soft ground at a construction site, and a support guide tube for fixing the anchor pin. The purpose is to:

The spiral anchor pile of the present invention avoids the steel pipe with a pile bottom plate welded to the tip, a spiral blade wound around the circumference buried underground of the steel pipe pipe at equal intervals, and the spiral blade. A plurality of pin holes formed by vertically shifting adjacent ones by an angle of 90 °, a short cylindrical support guide tube for guiding an anchor pin by welding to an opening edge of the pin hole, and sliding on the support guide tube An anchor pin that is freely fitted and protrudes radially outward from the peripheral surface of the steel pipe,
The support guide tube has an outer diameter that fits into the pin hole, is welded to the opening edge of the pin hole, and forms a shallow groove having a predetermined width that communicates with a part of the inner peripheral surface along the axial direction, The shallow groove is provided with a leaf spring attached so that its tip is outward and rises in the center direction, has an outer diameter slidably fitted on the inner peripheral surface of the support guide tube, and is stored in the steel pipe. A stopper groove of a predetermined length with the leaf spring width is formed in a part of the outer peripheral surface of the cylindrical body along an axial direction coinciding with the leaf spring of the support guide cylinder, In the transverse direction of the stopper groove, a ridge at a predetermined interval with which the tip of the leaf spring is engaged is formed, and a stopper made of a disk having a larger diameter than the support guide tube is provided inside the steel pipe pipe. An anchor pin integrally welded and fixed to the cylindrical body so as to close the cylinder. That.
Further, the spiral blade has a length of one pitch wound around the circumferential surface of the steel pipe, and a pitch between the spiral blades is 10 pitches.

According to the spiral anchor pile of the present invention, a shallow groove having a predetermined width is formed, which has an outer diameter that fits into the pin hole and is welded to the opening edge of the pin hole and communicates with a part of the inner peripheral surface along the axial direction. A supporting guide cylinder having a leaf spring formed so that a tip thereof is directed outward and rises in the center direction in the shallow groove, and an outer diameter slidably fitted to the supporting guide cylinder, and a steel pipe pipe is provided. A stopper groove having a width of the leaf spring is formed in a part of the outer peripheral surface of the cylinder along an axial direction coinciding with the leaf spring of the support guide cylinder. In the transverse direction of the groove, a plurality of ridges with which the tips of the leaf springs are engaged are formed, and a stopper made of a disk having a diameter larger than that of the support guide tube is provided on the inner side of the steel pipe. Since it consists of an anchor pin welded and fixed so as to close the support guide cylinder, Even the force is pushed back by the board pressure is exerted to the anchor pin, the tip of the leaf spring is engaged with the protrusion of the stopper groove, all of the anchor pin is fixed to the state of protruding.

Next, an embodiment of the present invention will be described below.
As shown in FIG. 1, the spiral anchor pile according to the present invention is wound around the steel pipe 1 having a pile bottom plate 2 welded at the tip thereof and a circumferential surface buried in the steel pipe 1 at equal intervals. A spiral blade 3 and a plurality of pin holes 4 formed adjacent to each other in the vertical direction at an angle of 90 ° so as to avoid the spiral blade 3 are provided.
Further, the spiral blade 3 has a length of one pitch wound around the circumferential surface of the steel pipe 1 and a pitch of the spiral blades 3 of 10 pitches.
Further, a short cylindrical support guide tube 5 shown in FIG. 2 for guiding an anchor pin described later by welding to the opening edge of the pin hole 4 and a steel pipe 1 An anchor pin 6 shown in FIG.
The excavation can be facilitated by forming the tip of the pile bottom plate 2 of the spiral anchor pile into two stages with a small-diameter tube and spirally winding the spiral blade 3.

As shown in FIG. 2 (a) sectional view and (b) right side view, the support guide cylinder 5 has an outer diameter that fits into the pin hole 4 and is welded to the opening edge of the pin hole 4, A shallow groove 7 having a predetermined width communicating with the axial direction is formed in a part of the surface, and is fixed to the inside of the shallow groove 7 so that the tip of the shallow groove 7 is directed outward toward the center. And a short cylindrical body to which a leaf spring 8 having a free end formed on the outside is mounted.

As shown in FIG. 3, the anchor pin 6 has an outer diameter that is slidably fitted to the inner peripheral surface of the support guide cylinder 5, and has a length that is stored in the steel pipe 1. A stopper 9 made of a disk having a diameter larger than that of the support guide cylinder 5 is integrally fixed to the inside of the steel pipe 1 by welding to a cylindrical body so as to cover the support guide cylinder 5 having the pin hole 4 opening. It is.
Further, a stopper groove 10 having a predetermined length and a width of the leaf spring 8 is formed in a part of an outer peripheral surface of the anchor pin 6 along an axial direction coinciding with the leaf spring 8 of the support guide cylinder 5. In the transverse direction of 10, a ridge 11 is formed at a predetermined interval with which the tip of the leaf spring 8 engages.

Next, the operation of the spiral anchor pile of the present invention will be described below.
When the steel pipe 1 is buried in the ground, the anchor pin 6 is housed in the steel pipe 1 as shown by a solid line in FIG. It is held in the engaged state.
When the embedding of the steel pipe 1 is completed by turning the spiral anchor pile by the operation of the anchoring mechanism shown in FIG. 5, the anchor pin 6 is pushed out to the outside of the radius of the steel pipe 1 as shown by the broken line in FIG. The projections 11 of the stopper grooves 10 of the anchor pins 6 push up the leaf springs 8 so that the anchor pins 6 protrude into the ground.
The anchoring mechanism includes a hydraulic jack, a lifting motor, a rotating lever, a hydraulic pump, and the like, as shown in FIG.
When the stopper 9 of the anchor pin 6 comes into contact with the inner end surface of the support guide cylinder 5, the operation of the anchoring mechanism is completed, the reverse operation is performed, and the hydraulic jack returns, and the leaf spring 8 The stopper pin 10 is fixed in a state in which it is engaged with the base end side of the protrusion 11, that is, in a state in which the anchor pin 6 protrudes.

In this way, if all the anchor pins 6 are held in a protruding state, the tip of the leaf spring 8 engages with the ridge 11 of the stopper groove 10 even if the force pushed back by the ground pressure acts on the anchor pin 6. Therefore, the anchor pin 6 does not return.

It is a perspective view of the spiral anchor pile of the present invention. FIG. 3 is an explanatory view of the support guide tube of the present invention. FIG. 3 is a plan view of the anchor pin of the present invention. FIG. 4 is a cross-sectional view illustrating a state where the anchor pin of the present invention is incorporated. FIG. 4 is an explanatory view of the anchoring mechanism of the present invention.

Explanation of reference numerals

1: Steel pipe 2: Pile bottom 3: Spiral blade 4: Pin hole 5: Support guide tube 6: Anchor pin 7: Shallow groove 8: Leaf spring 9: Stopper 10: Stopper groove 11: Ridge

Claims (2)

A steel pipe 1 having a pile bottom plate 2 welded to the tip, a spiral blade 3 wound around the circumference of the steel pipe 1 at equal intervals around a circumferential surface buried in the ground, and a vertical direction avoiding the spiral blade 3 A plurality of pin holes 4 formed by shifting the adjacent members by an angle of 90 °, a short cylindrical support guide tube 5 that guides the anchor pin 6 by welding to the opening edge of the pin hole 4, A spiral anchor pile comprising an anchor pin 6 slidably fitted and protruding radially outward from the circumferential surface of the steel pipe 1
The support guide cylinder 5 has an outer diameter that fits into the pin hole 4, is welded to the opening edge of the pin hole 4, and has a predetermined width of a shallow groove 7 that communicates with a part of the inner peripheral surface along the axial direction. And a leaf spring 8 attached to the shallow groove 7 so that its tip is directed outward and rises in the center direction, and has an outer diameter that is slidably fitted to the inner peripheral surface of the support guide cylinder 5. A cylindrical body having a length to be stored in the steel pipe 1 and having a width along the axial direction coincident with the leaf spring 8 of the support guide cylinder 5 on a part of the outer peripheral surface of the cylindrical body. A stopper groove 10 having a predetermined length is formed, and a ridge 11 is formed in the transverse direction of the stopper groove 10 at a predetermined interval with which the tip of the leaf spring 8 is engaged. A stopper 9 made of a disk having a larger diameter than the support guide tube 5 is integrated with the cylindrical body so as to close the support guide tube 5. Spiral anchor piles, characterized in that it consists of welding a fixed anchor pin 6. 2. The spiral anchor pile according to claim 1, wherein the spiral blade 3 has a length of one pitch wound around the peripheral surface of the steel pipe 1 and a pitch of 10 between the spiral blades 3. 3.

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