JP2003293369A - Construction method and device for removing existing pile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the fear that the housing environment of neighboring residents is damaged by a sound, vibrations or the like because piles are removed without largely excavating the peripheries of the piles, and to largely improve operating efficiency because reinforcements are cut surely even when there are the reinforcements in piles and the whole piles are cut in a required depth without a breaking. <P>SOLUTION: The existing pile 1 is inserted into a ground so as to be made eccentric and surrounded while an excavating casting 3, in which cutters 15a, 15b and 15e are projected from the inner peripheral surface of a casing head 3b, is rocked and rotated by a pile-positioning device. The excavating casing 3 is turned on the whole periphery and the existing pile 1 is cut from an outer peripheral section by the cutters 15a, 15b and 15e, and the treated existing pile is extracted by a tile-pebble removing means such as a hammer grab. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for removing existing piles buried in the ground.

[0002]

2. Description of the Related Art Conventionally, regarding removal of existing piles buried in the ground, there are a method of pulling out the pile as it is and a method of removing it after partially breaking it. It is often a pile with a small diameter that can be hung by a crane.

As a pulling-out method, for example, a vibro hammer suspended by a crane is connected to the head of an existing pile by a chuck device, and the vertical movement generated by the vibro hammer is used to lift the existing pile together with the vibro hammer by a crane. Or pulling the auger casing with a bit attached to the tip of the auger casing while rotating and inserting it around the existing pile to cut the friction between the existing pile and the ground, and then pulling out the auger casing. For example, the existing piles can be pulled out with a crane, the surroundings of the piles can be excavated with a casing, and the wire set in the casing can be pulled and hung on the piles.

With the former method using a vibro hammer, vibration and noise during operation are large, and it is difficult to construct it in urban areas, etc., considering the influence on neighboring residents, and the latter auger casing is pulled out. In order to pull out the existing pile after collecting it, the surrounding ground collapses and is buried in the gap created around the existing pile after pulling out the auger casing.As a result, the friction resistance of the existing pile increases and it remains as it is. It may not be possible to pull out.

Further, in the method of cutting the friction between the existing pile and the ground by inserting the bit into the periphery of the existing pile while rotating it, the auger casing is rotated around the pile with the auger casing. When excavating by rotation, the pile often rotates together with the casing and the casing head, which makes it impossible to cut the pile.

Furthermore, both methods require a vibro hammer or a large-scale crane for hoisting existing piles and have a large lifting force, which not only increases the construction cost but also limits the construction site.

On the other hand, in the method of removing after partially breaking, a casing provided with a so-called inner cutter is used, the casing and the inner cutter are used to cut up to the reinforcing bar portion of the existing pile, and debris such as hammer grabs is used. Remove by removing means.

One of them is the device for removing underground piles disclosed in Japanese Unexamined Patent Publication No. 8-120671, and as shown in FIGS. 7 to 10, existing concrete piles having a reinforcing bar inside are buried in the ground. In order to remove 1, the excavation cutter 3a is provided at the lower edge and the cutter 2 is provided so as to project in the cylinder, and the excavation casing 3 is rotatably and press fitly supported on the upper portion of the pile. It is composed of a building device 11 and a hammer grab 13 as a debris removing means for taking out the treated pile in the excavation casing 3.

A crane 12 is installed on the ground,
The hammer glove 13 is suspended from the crane 12, and the building device 11 and the crane 12 are connected by a bar 14.

A plurality of the cutters 2 are attached to a bed 2a welded to the excavation casing 3, and the beds 2a are triangular stays 2b provided above and below the bed 2a, and triangular stays provided on the side surfaces of the bed 2a. It is firmly supported by the stay 2c.

Further, the cutters 2 provided at the four places are provided with steps at their mounting depths. Further, the cutters 2 at four locations are different in protrusion length. That is, the cutter 2 located at the bottom is projected most, and the projection length of the cutter 2 located at the top is short.

When removing the existing piles 1 buried in the ground by the above apparatus, first, the existing piles 1 to be removed are to be removed.
The building device 11 is installed directly above. Then, the excavation casing 3 is set in the building device 11 to rotate and apply pressure. Then, the cutter 2 cuts the reinforcing bars 10 of the pile 1 and crushes the whole to proceed.

In this manner, the required depth, that is, the existing pile 1 is removed to the extent that it does not hinder the original construction.
After this, the hammer glove 13 is lowered into the excavation casing 3 to discharge the debris and earth and sand inside.

[0014]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In the underground pile removing device disclosed in Japanese Patent No. 671, the cutter 2 is the pile 1
Since it cuts from the top, it becomes extremely difficult to excavate,
Furthermore, a great amount of time is spent breaking the pile 1.

In this Japanese Patent Laid-Open No. 8-120671, the pile 1 is cut at a required position, and a movable cutter (copy cutter) can be moved back and forth inside the pile 1 in addition to the fixed cutter 2 described above. Although a projecting embodiment is also described, this movable cutter is provided in a bed containing a hydraulic cylinder so that it can be retracted and retracted in the horizontal direction, and liquid pressure is applied to this bed by a high pressure hose. In addition to the need for a hydraulic swivel, putting a high-pressure hose inside the casing hinders the effective use of the inner diameter of the casing.In addition, adding a hose according to the extension of the casing, installing or removing a swivel device, etc. Work increases and work efficiency is poor.

Moreover, since the movable cutter (copy cutter) is movable, it is difficult to make the cutter itself and the mechanism that supports it to be robust enough to cut concrete and reinforcing bars, and the cutter is the inner circumference of the casing. Even if two pieces are provided symmetrically with each other, the burden on one cutter for cutting the reinforcing bar is large, and it is difficult to easily cut the reinforcing bar.

The object of the present invention is to eliminate the inconvenience of the conventional example and to remove the pile without excavating the surrounding area of the pile, so that there is a risk of damaging the residential environment such as neighboring residents due to noise or vibration. No, and even if there is a reinforcing bar in the pile, it can be cut reliably, and further, it can be cut at the required depth without destroying the entire pile, which can greatly improve work efficiency. An object is to provide a method and an apparatus for removing existing piles.

[0018]

In order to achieve the above-mentioned object, the present invention provides a method for removing existing piles by swinging and rotating an excavating casing having a cutter protruding from the inner peripheral surface of a casing head by an assembling device. Insert into the ground so as to eccentrically and surround the existing pile, then rotate the excavation casing all around and cut the existing pile from the outer peripheral portion with the cutter,
The gist is to take out the existing pile that has been treated by the debris removing means such as a hammer grab.

The removal device for existing piles is, firstly, a device for removing existing piles buried in the ground, which is an excavation casing having a cutter protruding from the inner peripheral surface of the casing head, and this casing. And a debris removing means such as a hammer grab for taking out the treated existing pile in the casing, and secondly, the cutter is a casing. The heads should be arranged side by side so as to fit within a half circumference on the inner peripheral surface, and so that the protruding length thereof becomes longer in sequence, and thirdly, all the cutters out of a plurality of Or, partly, the protrusion length from the inner peripheral surface of the casing head is made larger than the concrete cover thickness from the reinforcing bar of the existing pile. Fourth, the cutter has a protrusion length that gradually increases from the smallest one. Bell it, or cutter are those summarized in that arranging largest ones so as to sequentially turn the protrusion length at the left and right at the center is reduced.

According to the present invention as set forth in claims 1 and 2, it is desired to set the excavation casing and the casing head in an eccentric position at a position surrounding the existing pile with respect to the existing pile and cut the pile. Insert into the ground while rocking to the position (depth). At this time, the cutter protruding from the inner peripheral surface of the casing head does not contact the existing pile. Next, when the cutting casing reaches the position to be cut, the excavating casing is rotated all around, and the cutter that has not hit it hits the outer circumference of the existing pile and cuts from the outer circumference. After that, the existing pile that has been treated by the debris removing means such as a hammer grab is taken out.

Further, since swing excavation is performed, co-rotation of the pile does not occur, and it is possible to surely excavate the periphery of the pile to a position to be cut, and perform rotary cutting at that position.

According to the present invention as set forth in claim 3, in addition to the above-mentioned action, the cutter is arranged to fit within the half circumference on the inner circumference of the casing. Therefore, if the other half circumference surface is brought close to the existing pile, the cutter will be removed. It is possible to swing and rotate the casing head without contacting the existing pile. In addition, the cutters are arranged side by side with a certain interval, and the lengths of the cutters are gradually increased, so that the cutters are like sawtooth waves, and they can be cut into the existing piles one after another to ensure that Can be cut.
Furthermore, since they are arranged side by side, they are cut so that cuts are made in the side, and compared to the case where the existing piles are broken up and down, it is possible to cut reliably and quickly.

According to the fourth aspect of the present invention, the cutter can be reliably applied to the reinforcing bar of the existing pile, and the reinforcing bar can be reliably cut.

According to the fifth aspect of the present invention, the cutters are arranged so that the projecting length increases in order from the smallest cutter. Therefore, the casings are rotated in the direction of this arrangement so that the cutters change from the smallest to the largest. It can be surely cut by sequentially digging into the existing pile.

According to the sixth aspect of the present invention, the cutters are arranged such that the largest one is arranged in the center so that the protruding lengths are sequentially reduced on the left and right, so that the casing can be rotated in either the left or right direction. The cutter can be surely cut by biting the cutter into the existing pile one by one from the small one to the large one.

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a vertical cross-sectional side view showing a first embodiment of an existing pile removing apparatus of the present invention, FIG. 2 is a plan view of the same as above, and the same components as those in FIGS. It is attached.

Reference numeral 3 in the drawing denotes an excavation casing, and a casing head 3b is fitted to the tip of a main body portion 3c having a required length which is appropriately added on the way, and a fitting portion is fastened with a bolt 4. In addition, the casing head 3b has a digging cutter 3 at the lower end.
a is provided.

As shown in FIGS. 3 and 4, the excavation casing 3 is supported by a building device 11 so as to be swingable and rotatable. As is well known, the building device 11 is a press-fitting device used in, for example, the all-casing construction method, and rotates the chuck device 5 and the chuck device 5 that clamps the outer periphery of the excavation casing 3 to the reaction frame 9 in a rattling manner. A drive device 6 such as a motor 6a and a speed reducer 6b, and an elevating cylinder 7 that is a hydraulic cylinder that moves the chuck device 5 and the drive device 6 up and down are provided. Reference numeral 8 in the figure denotes an outrigger which is a horizontal jack for horizontally installing the building device 11.

The excavating casing 3 is the above-mentioned building device 11
While being chucked on the outer periphery by the, it is rotatably propelled and inserted into the ground.

In the present invention, in addition to this structure, the cutters 15a, 15b, ... 15e are provided on the inner peripheral surface of the casing head 3b at the tip of the excavating casing 3 at intervals so that the cutters 15a, 15b, ... They were arranged side by side so that the protruding length was long and arranged side by side. This cutter 15a,
Reference numerals 15b, ... 15e are claw-shaped objects having sharp blades made of superhard metal that is harder than the metal forming the excavation casing 3, and are firmly fixed to the inner peripheral surface of the casing head 3b by welding or the like.

The cutters 15a, 15b, ... 15e
Is the whole or a part of the plurality (in the example shown, except the cutter 15a, the projection length from the inner peripheral surface of the casing head 3b is larger than the concrete cover thickness h from the reinforcing bar 10 of the existing pile 1). .

In the present embodiment, the cutters are arranged so that the protruding length increases in order from the smallest cutter 15a.

The number of the cutters 15a, 15b, ... 15e is determined by the diameter of the casing head 3b. The diameter of the casing head 3b is the diameter of the existing pile 1 and the cutter 1 having the maximum length.
It is assumed that the length of 5e and the gap length are more consistently combined.

Next, the method of the present invention for removing the existing pile 1 using the excavation casing 3 will be described. Here, the existing pile 1 is a structure buried in the ground, for example,
Shows concrete piles that have reinforcing bars inside (ready-made piles such as PC and RC, field construction piles). The diameter of the existing pile 1 that can be treated depends on the diameter of the excavation casing 3, but is preferably within a few meters for ease of treatment.

The building device 11 is installed above the existing buried pile 1 and the excavation casing 3 and the casing head 3b are set at positions eccentric to the existing pile 1. In this case, as shown in FIG. 2, the existing pile 1 has a cutter 15
15e approaching the inner peripheral surface of the excavation casing 3 away from a, 15b ,.

The outer periphery of the excavation casing 3 is clamped and fixed by the chuck device 5 of the embedding device 11, and the driving device 6
Then, the chuck device 5 is rotated (swinged) left and right, and at the same time, the lifting cylinder 7 is set to be free.
Then, the casing head 3b is inserted into the ground at the outer peripheral portion so as to surround the existing pile 1.

Excavation using the excavation casing 3 is performed on the existing pile 1
To the depth you want to cut (several meters). The depth of several meters is a length at which the weight of the cut existing pile 1 can be taken out by the hammer grab 13.

When the position of several meters to be cut is reached, the digging casing 3 is rotated by the erection device 11 in one direction over the entire circumference.

As a result, the cutters 15a, 15b, ... 15
The outer periphery of the existing pile 1 is inserted in order from the cutter 15a having a short e, and the existing pile 1 is cut from the outer periphery as shown in FIG.
The reinforcing bars 10 are cut by the bites of the cutters 15a, 15b, ... 15e, and the existing piles 1 are cut into a doglegged shape. The cutters 15a, 15b, ... 15e preferably have a thickness of 50 to 100 mm.

The processed existing pile 1 thus cut is grasped and taken out by the debris removing means such as the hammer grab 13 suspended from the crane 12.

FIG. 5 shows a second embodiment of the present invention. The cutters 15a, 15b, 15c and 15d are arranged such that the largest cutter 15d is located at the center and the protruding lengths thereof are sequentially reduced on the left and right sides. In the largest cutter 15d, the blades are directed to the left and right sides, and the blades are directed toward the shorter ones.

Thus, the cutters 15a, 15b, 15
c4 and 15d should be 14 <l3 to make it easier to bite.
<L2 <l1 length, of which 2 to 3 (15
b, 15c, 15d) cuts the reinforcing bar 10, so that the protruding length from the inner peripheral surface of the casing head 3b is larger than the concrete cover thickness h from the reinforcing bar 10 of the existing pile 1.

The diameter (inside diameter D) of the casing head 3b is the pile diameter d of the existing pile 1 + the length l1 of the cutter 15d.
Determined by + α (gap).

In the case of the second embodiment, the entire rotation of the excavation casing 3 for cutting the existing pile 1 may be either left or right.

[0045]

As described above, the existing pile removing method and apparatus according to the present invention can remove the pile without excavating the surrounding area of the pile significantly. There is no danger of damaging the environment, and even if there are reinforcing bars in the pile, it can be cut reliably, and it can be cut at the required depth without destroying the entire pile, greatly improving work efficiency. Can be improved to.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing a first embodiment of an existing pile removing apparatus of the present invention.

FIG. 2 is a plan view showing a first embodiment of an existing pile removing device of the present invention.

FIG. 3 is a side view showing an erection device and an excavation casing used in the existing pile removing device of the present invention.

FIG. 4 is a plan view showing an erection device and an excavation casing used in the existing pile removing device of the present invention.

FIG. 5 is a plan view showing a second embodiment of an existing pile removing device of the present invention.

FIG. 6 is an explanatory view showing a method for removing an existing pile of the present invention.

FIG. 7 is a perspective view showing a conventional example.

FIG. 8 is a plan view of a conventional example.

FIG. 9 is a vertical sectional side view of a conventional example.

FIG. 10 is a schematic view showing a construction state of a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Pile 2 ... Cutter 2a ... Bed 2b ... Stay 2c ... Stay 3 ... Excavation casing 3a ... Excavation cutter 3b ... Casing head 3c ... Body part 4 ... Bolt 5 ... Chuck device 6 ... Drive device 6a ... Motor 6b ... Reduction gear 7 ... Lifting cylinder 8 ... Outrigger 9 ... Reaction force frame 10 ... Reinforcing bar 11 ... Building device 12 ... Crane 13 ... Hammer grab 14 ... Bars 15a, 15b, ... 15e ... Cutter

Claims (6)

[Claims] 1. An excavating casing having a cutter protruding from the inner peripheral surface of a casing head is inserted into the ground so as to eccentrically surround an existing pile while swinging and rotating the excavating casing by a building device, and then the excavating casing is rotated all around. The existing pile removing method is characterized in that the existing pile is cut from the outer peripheral portion with the cutter and the existing pile that has been treated by the debris removing means such as a hammer grab is taken out. 2. An apparatus for removing existing piles buried in the ground, comprising an excavation casing having a cutter protruding from an inner peripheral surface of a casing head, and swinging the casing around the existing piles. An erection device that rotatably supports,
An apparatus for removing existing piles, comprising: debris removing means such as a hammer grab for taking out the existing treated piles in the casing. 3. The existing cutters according to claim 2, wherein the cutters are arranged side by side so that the cutters are spaced from each other on the inner peripheral surface of the casing head within a half circumference, and the protruding lengths thereof are sequentially increased. Pile removal device. 4. The cutter has a protrusion length from the inner peripheral surface of the casing head that is larger than the concrete cover thickness from the reinforcing bars of the existing pile among the plurality of cutters.
Alternatively, the existing pile removing device according to claim 3. 5. The existing pile removing device according to claim 2, wherein the cutters are arranged so that the projecting length thereof increases from the smallest one. 6. The existing pile removing device according to any one of claims 2 to 5, wherein the cutters are arranged such that the largest one is centered and the protruding lengths thereof are sequentially reduced on the left and right sides.