JP2002138472A - Anchor foundation pile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an anchor foundation pile for reinforcing soft ground by fitting an anchor pin protruding from the peripheral surface of a steel pipe outward in a radial direction. SOLUTION: The anchor foundation pile is composed of the steel pipe 2 whose end undergoes the welding of a cap 1, many pin holes 3 formed in the peripheral surface, which is buried in the ground, of the steel pipe 2, an anchor pin 4 fitted into the pin hole 3 in order to freely protrude from the peripheral surface of the steel pipe 2 outward in the radial direction, and a pin extruding mechanism 5 for allowing the anchor pin 4 to protrude.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anchor foundation pile which is driven into a foundation as reinforcement of soft ground at a construction site.

[0002]

2. Description of the Related Art Conventionally, at a construction site, a steel pipe is buried to reinforce a soft ground, thereby reinforcing the ground. However, in order to completely reinforce the soft ground, steel pipes require measures to increase the diameter of the steel pipes or lengthen the steel pipes, which increases production costs and work time. And other problems.

[0003]

Accordingly, an object of the present invention is to provide an anchor foundation pile for reinforcing soft ground by providing an anchor pin projecting radially outward from the peripheral surface of a steel pipe. I do.

[0004]

For this purpose, the anchor foundation pile according to the present invention is provided with an anchor pin projecting radially outward from the peripheral surface of the steel pipe. In addition, the anchor foundation pile of the present invention has a steel pipe with a cap welded at the tip, a plurality of pin holes formed on a peripheral surface of the steel pipe buried in the ground, and fits into the pin hole. It comprises an anchor pin which can protrude radially outward from the peripheral surface of the steel pipe, and a pin pushing mechanism for causing the anchor pin to protrude.

[0005]

An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the anchor foundation pile of the present invention includes a steel pipe 2 having a cap 1 welded to a tip thereof, and a plurality of pin holes 3 formed on a peripheral surface of the steel pipe 2 buried in the ground. An anchor pin 4 fitted in the pin hole 3 and capable of protruding radially outward from the peripheral surface of the steel pipe 2 and a pin pushing mechanism 5 for projecting the anchor pin 4.

[0006] As shown in FIG.
A hemispherical cap 1 is welded to the tip with a pipe diameter capable of accommodating the pin pushing mechanism 5 inside, a fixed guide 6 holding the pin pushing mechanism 5 is welded inside the tip, and a stopper 7 is placed inside the other upper part. A guide plate 8 supporting the pin pushing mechanism 5 is fixed on the stopper 7 by welding. Further, the fixed guide 6 and the guide plate 8
The pin push-out mechanism 5 is housed between the steel pipe and the steel pipe 2 in which the pin push-out mechanism 5 is housed. Note that FIG.
In the case of (1), the pin holes 3 are provided at two positions in the diameter direction, and the angles of the pin holes 3 are shifted by 90 ° in multiple stages. Also,
In order to reinforce the pin hole 3, a reinforcing ring 9 can be welded to the inner diameter of the pin hole 3.

As shown in FIG. 3, the anchor pin 4 has a length to be stored in the steel pipe 2 and has a front end engaged with the pin hole 3 and a rear end flange connected to the pin pushing mechanism 5.
And a rod-like member having an appropriate cross-sectional shape supported by the steel pipe pipe 2 according to the cross-sectional shape of the anchor pin 4.
To form When the steel pipe 2 is buried in the ground, the anchor pin 4 is held by the pin pushing mechanism 5 in a state of being stored in the steel pipe 2 as shown by the solid line in FIG. The pin is pushed out in the radial direction by the operation of the pin pushing mechanism 5, and is stopped by the flange formed on the anchor pin 4 abutting around the pin hole 3 as shown by the dotted line in FIG. After being performed, the anchor pin 4 is retained and remains in a state of protruding from the peripheral surface of the steel pipe 2 as it is.

As shown in FIG. 2, the pin pushing mechanism 5 includes a jack supporting shaft 10 and a plurality of jacks 11.
And a rotatable rotary shaft 12 formed with a screw at a position facing the pin hole 3 to support the shaft. The jack support shaft 10, that is, the rotary shaft 12 passes through the center of the steel pipe 2. Fixed guide 6 and guide plate 8
As shown in FIG. 3, a screw is formed at a position of the rotating shaft 12 opposite to the pin hole 3 of the steel pipe 2, and the jack 11 is further screwed to the screw of the rotating shaft 12. The corresponding screw type jack 13 is arranged. As shown in FIG. 3, the screw type jack 13
An upper and lower rotary block 14 screwed to the first link 15, a first link 15 and a second link 16 rotatably supported by the rotary block 14 and provided on the left and right with the rotary shaft 12 interposed therebetween; And a mounting plate 17 for connecting the second links 16 to each other and holding the anchor pins 4, and constitutes a pantograph mechanism as a whole. The mounting plate 17 is provided with a concave portion for holding the flange of the anchor pin 4 so that the anchor pin 4 does not fall off, but may be formed as an annular convex portion. Therefore, by rotating the rotating shaft 12 forward or backward, the rotating blocks 14 approach or separate from each other to expand or close the first link 15 and the second link 16, and the mounting plate 17 The steel pipe 2 can be moved forward or backward in the radial direction. In the embodiment, the pin pushing mechanism 5 has been described as the screw type jack 13. However, the present invention is not limited to this, and it is also possible to use a pneumatic or hydraulic type jack. In this case, the jack support shaft 10 is fixed without being the rotatable rotary shaft 12, and a pneumatic or hydraulic jack is fixed at the position of the pin hole 3 of the jack support shaft 10, and the jack is connected to the pneumatic or hydraulic jack. It can be pneumatically or hydraulically operated by connecting pneumatic or hydraulic pipes.

Next, a method of constructing the anchor foundation pile of the present invention will be described.
After the pin pushing mechanism 5 is stored, the steel pipe 2 is buried in the soft ground by a pile driver in the same manner as the conventional construction method. When the jack support shaft 10 is normally rotated after embedding, the screw type jack 13 itself also attempts to rotate integrally with the jack support shaft 10, but the anchor pin 4 acts as a stopper to prevent rotation, and the rotation block 14 is turned off. The screw type jack 13 is extended by the action of the screw to push the anchor pin 4 outward in the radial direction, and the anchor pin 4 is inserted through the pin hole 3.
Project into the ground. At this time, since the plurality of screw type jacks 13 are integrally connected to the jack support shaft 10, the plurality of screw type jacks 13 are simultaneously operated.

When the protrusion of the anchor pin 4 is completed, the jack support shaft 10 is rotated in the reverse direction to shorten the screw-type jack 13, leaving the anchor pin 4, and pulling the mounting plate 17 inward in the radial direction. At the beginning of the reverse rotation, since the mounting plate 17 is engaged with the anchor pin 4, the screw-type jack 13 itself is prevented from rotating and pulled back, but is immediately disengaged and integrated with the jack support shaft 10. As a result, the screw type jack 13 idles and does not return completely. After the retraction is completed, the jack support shaft 10
From the steel pipe 2 to take out the screw type jack 13 and the guide plate 8. In the steel pipe 2, only the fixed guide 6 remains at the tip, and all other members are pulled up and used for the steel pipe 2 that is being prepared.

[0011]

The anchor foundation pile according to the present invention is provided with anchor pins protruding radially outward from the peripheral surface of the steel pipe, thereby providing resistance to sinking or pulling up of the steel pipe, thereby reinforcing soft ground. In addition, since the anchor pin is projected after the steel pipe is buried, the work is easy, and a pipe having a large diameter or a long pipe is not required unlike the related art, so that the construction cost can be reduced.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of an anchor foundation pile of the present invention.

FIG. 2 is a longitudinal sectional view of the anchor foundation pile of the present invention.

FIG. 3 is an explanatory view of a panda graph jack in the anchor foundation pile of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cap 2 Steel pipe 3 Pin hole 4 Anchor pin 5 Pin pushing mechanism 6 Fixed guide 7 Stopper 8 Guide plate 9 Reinforcement ring 10 Jack support shaft 11 Jack 12 Rotation shaft 13 Screw jack 14 Rotation block 15 First link 16 Second link 17 Mounting plate

Claims (2)

[Claims] 1. An anchor foundation pile comprising an anchor pin protruding radially outward from a peripheral surface of a steel pipe. 2. A steel pipe with a cap welded to the tip, a plurality of pin holes formed in a peripheral surface buried in the ground of the steel pipe, An anchor foundation pile comprising an anchor pin that can protrude radially outward and a pin pushing mechanism that causes the anchor pin to protrude.