JPH0986857A - Hanging jig for removal of footing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove a footing at the top end of a foundation pile, by hanging it up safely and efficiently. SOLUTION: This hanging jig is equipped with a frame member 10 which has integrally a hanger 15 to which a hanging-up means for a crane, etc., is coupled, and at a frame member 10, the tops of plural arms 20, 20,... for holding-up footings are hung down vertically, being pivoted rockably, and at the bottom of each arm 20 for holding-up footing, a footing locking claw 22 to be inserted into the periphery of the footing 3 is projected horizontally.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a footing removing hanging jig which is engaged with a footing to lift the footing when the footing is removed from the upper end of the foundation pile.

[0002]

2. Description of the Related Art As shown in FIG. 8, a floating structure such as Asahashi has a plurality (6 to 9) of pine piles 1, 1 ... Driven into the ground and these pine piles 1, 1 ... There may be a case where a concrete footing 3 is cast and formed on the upper end of the base. When removing such a foundation, a tubular casing is driven by a vibro hammer while using jet water and air together, and is driven into the ground so as to surround the footing 3 and the pine piles 1, 1 ... After the friction with the surrounding soil is reduced, the footing 3 is hoisted by hoisting means such as a crane, and the pine piles 1, 1 ... Then, when the footing 3 is lifted as described above, conventionally, as shown in FIG. 9, chemical anchors 9, 9, ... Are installed at a plurality of locations (4 locations) on the outer peripheral surface of the footing 3, and the As a hanging jig, hanging wire rods 5 and 5 such as a wire rope of a crane were hung.

[0003]

When the chemical anchor is used as a hanging jig as in the conventional case, it is difficult to accurately confirm the strength of the chemical anchor. Therefore, the chemical anchor is attached to the outer peripheral surface (side surface) of the footing. An anchor was installed, and the shearing strength of the anchor bolt ensured the strength when the footing was lifted. Therefore, the chemical anchor cannot be installed on the outer peripheral surface of the footing only after the driving of the casing around the footing is completed, and on the other hand, the resin adhesive of the chemical anchor surely cures and the anchor bolt However, there is a problem that the work efficiency is poor because it takes time to be fixed to the footing.

The present invention has been made in view of such conventional problems.
An object of the present invention is to provide a lifting jig for removing a footing capable of safely and efficiently lifting and removing the footing on the upper end of the foundation pile.

[0005]

The features of the present invention for solving the above-mentioned conventional problems and achieving the intended purpose are as follows.
In the hanging jig for removing footing, which is supported by the upper end of the foundation pile driven into the ground and is anchored to the concrete footing that has been cast, and the hoisting jig for lifting the footing, the hoisting part to which hoisting means such as a crane is connected. An integral frame member is provided, on which upper ends of a plurality of footing lifting arms are swingably pivoted and hung down, and at the lower end of each footing lifting arm, a peripheral edge of the footing is provided. This is because the footing locking claw that is inserted in is projected horizontally.

It is preferable that the bottom surface on the tip side of the footing locking claw is inclined toward the inner side, and the outer side surface of each foot of the footing lifting arm is provided with a retaining wire around which a retaining wire is wound. It is preferable that the parts are fixed.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an example of an embodiment of the present invention will be described with reference to FIGS.

In the figure, 10 is a frame member, 20, 20 ...
... are footing lifting arms, each formed of an H-shaped steel material or the like.

As shown in FIG. 1, the frame member 10 includes outer frame parts 11, 11, ...
Corner frame parts 12, 1 fixed obliquely inside the corner parts of 1, 11
2 ... and are formed in an annular shape having a size that surrounds the footing 3.

Then, each outer frame portion 11, 11 of the frame member 10
As shown in Fig. 2, suspension parts 15, 15 ... through which the suspension wire rods 5, 5 ... are inserted are fixedly provided on the upper surface of the ..., and the footing holder is provided on the lower surface directly below the suspension parts 15, 15. Upper arm 2
Connection parts 14, 14 ... To which 0, 20 ... Are connected are fixed. The suspending portion 15 and the connecting portion 14 are formed in a bracket shape having lateral through holes. Further, as shown in FIG. 3, guide portions 13, 13 ... Abutting on the upper tapered portion of the footing 3 are fixedly provided on the inner side surfaces of the respective corner frame portions 12, 12.

As shown in FIG. 2, the footing lifting arm 20 is vertically long, and has a connecting portion 24 fixed to the upper end of the lifting arm 20 and a footing locking member at the lower end. The claw 22 is fixedly installed. The locking claw 22 is arranged horizontally so as to project inward, and the bottom surface on the tip side thereof is formed in an arc shape that is inclined toward the inside. Further, a retaining portion 27 around which the retaining wire 7 is wound is fixedly provided on the outer side surface of the middle portion of the lifting arm 20, and the retaining portion 27 is formed in a C-shape that opens outward. Has been done.

The footing lifting arms 20, 20 ...
Is connected via the connecting portions 14 and 24 and the pin 21, respectively,
The frame members 10 are independently swingably connected, and are arranged in an annular shape having a size that encloses the footing 3 with a predetermined space therebetween.

The hanging jig constructed as described above is mounted on each hanging portion 15 of the frame member 10 with hanging wires 5 and 5 such as wire ropes of lifting means such as a crane via a shackle or the like. It is lifted by doing. At this time, each of the footing lifting arms 20, 20, ... Is hung substantially vertically from the outer frame portions 11, 11, ..

When the hoisting jig hoisted by the crane is gradually lowered from above the footing 3,
The tips of the locking claws 22, 22 ... Of the lifting arms 20, 20 ... Contact the footing 3 and receive a reaction force against its own weight, but the bottom surfaces of the locking claws 22, 22. As shown in FIGS. 4 and 5, the lifting arms 20, 20 ... Spontaneously open in correspondence with the shape of the outer peripheral surface of the footing 3. And the locking claws 22, 22 ...
6 reaches the bottom surface of the footing 3, as shown in FIG. 6, the lifting arms 20, 20 ... Close due to their own weight, and the locking claws 22, 22. It projects below the bottom. Note that the bottom surface of the locking claw 22 does not necessarily have to be inclined with respect to the footing 3 having a tapered upper portion as illustrated.

The casing lifting arms 20, 20 ...
Are independently swingable with respect to the frame member 10, and since the guide portions 13, 13 ... Are fixedly mounted on the frame member 10, as shown in FIG.
Can be suitably engaged even when the hook is slightly inclined, and can be suitably engaged even when the descending position of the hanging jig is slightly displaced from the position of the footing 3.

Next, after confirming how the engaging claws 22, 22 ... Hook the peripheral edge of the bottom surface of the footing 3, as shown in FIG. 6, the retaining arms of the lifting arms 20, 20. 27,2
Wrap a wire rod 7 such as a wire rope around 7 ... and tighten it through the lever block to lift the arm 2
Prevent 0,20 ... from opening accidentally. In addition,
The work of winding the retaining wire 7 is an underwater operation by a diver, but the C-shaped retaining portions 27, 27 ... Hold the retaining wire 7 suitably even during the work. Therefore, the work can be performed efficiently.

When the hoisting jig is lifted by hoisting means such as a crane, the footing 3 and the pine piles 1, 1
... can be removed together. Therefore, unlike the chemical anchor, it is not necessary to wait for the adhesive to harden, and the removal work of the foundation can be started immediately after the casing is pulled out, so the removal work can be performed efficiently, and unlike the chemical anchor, Since the strength calculation can be performed accurately, the work can be performed safely.

[0018]

As described above, in the hanging jig for footing removal according to the present invention, the upper ends of a plurality of lifting arm for footing are swingably pivotally attached to the frame member integrally having the hanging portion. ,
These footing lifting arms are hung down, and the footing locking claws are horizontally projected at the lower ends of the footing lifting arms, so that the lifting means such as a crane is connected to the hanging part of the frame member, and Open and close the upper arm so that the footing locking claws are inserted around the footing,
Since the footing can be lifted, the footing can be removed safely and efficiently.

In addition, by inclining the bottom surface of the tip side of the footing locking claw inward, when the frame member is lifted and gradually lowered from above the footing, the footing lifting arm has the shape of the footing. The footing locking claw can be suitably inserted into the peripheral edge of the footing because it naturally opens and closes in correspondence with.

Further, by fixing the slip-off preventing portion to the outer side surface of each footing lifting arm, a slip-off preventing wire material such as a wire rope is wound around the footing lifting arm and the footing lifting arm is lifted when the footing is lifted. Since the arms can be prevented from opening accidentally, the removal work can be performed more safely.

[Brief description of drawings]

FIG. 1 is a plan view showing an example of an embodiment of a footing removing hanging jig according to the present invention.

FIG. 2 is a front view of FIG.

3 is a sectional end view taken along line AA of FIG.

FIG. 4 is an elevational view showing a usage state of the example of FIG.

5 is an elevational view showing a usage state of the example of FIG. 1. FIG.

FIG. 6 is an elevational view showing a usage state of the example of FIG.

FIG. 7 is an elevational view showing a usage state of the example of FIG.

FIG. 8 is an elevation view showing a foundation of a shallow bridge composed of a plurality of pine piles and footings.

FIG. 9 is an elevational view showing a usage state of a chemical anchor as a conventional footing removal hanging jig.

[Explanation of symbols]

 1 Pine pile 3 Footing 5 Suspending wire (wire rope) 7 Detaching wire (wire rope) 9 Chemical anchor 10 Frame member 11 Outer frame part 12 Square frame part 13 Guide part 14 Connecting part 15 Suspension part 20 Footing lifting Arm 21 Pin 22 Footing locking claw 24 Connecting part 27 Detachment prevention part

Claims (3)

[Claims] 1. A lifting jig such as a crane is connected to a lifting jig for removing a footing, which is supported by the upper end of a foundation pile driven into the ground and is locked to a concrete footing that is cast and lifted. A frame member integrally having a hanging portion, the upper end of a plurality of footing lifting arms is swingably pivoted and hung down on the frame member, and the bottom end of each footing lifting arm is A footing removal hanging jig characterized in that footing locking claws inserted into the periphery of the footing are projected horizontally. 2. The hanging jig for footing removal according to claim 1, wherein the bottom surface of the footing locking claw on the tip side is inclined toward the inside. 3. The footing removing suspension jig according to claim 1, wherein an outer retaining portion around which an outer retaining wire is wound is fixedly provided on an outer side surface of each footing lifting arm.