JP2007077631A - Construction method and equipment for destroying existing pile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a construction method and equipment for destroying an existing pile, which shorten the whole operating time because an excavation cycle is short, which facilitate operations for hard ground, which enable large-diameter operations, and which facilitate a removal operation by a hammer grab because all reinforcements can be cut. <P>SOLUTION: In this construction method for destroying the existing pile, the equipment for destroying the existing pile enables a cutter 18 to be freely slid in a vertical direction by a holder 16 which is provided on the inner peripheral surface of a casing head 3b. The holder 16 makes a cutter sliding surface 17 inclined to be protruded from the inside of the casing head 3b depending on the downward movement of the cutter 18. By using the equipment, the casing head 3b aligned with a pile core is rotated and lowered, and the outer periphery of the pile is cut with the cutter 18 which is positioned in the upper part of the holder 16. Subsequently, the casing head 3b is pulled up and rotated in a position to be pulled up, and the reinforcements of the existing pile are cut with the cutter 18 which is positioned in the lower part of the holder 16. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method and an apparatus for destructing an existing pile buried in the ground.

  Conventionally, there are two methods for removing existing concrete piles buried in the ground: a method of pulling out as it is and a method of removing it after partially breaking, and the latter uses a casing provided with a so-called inner cutter. Then, cut up to the rebar of the existing pile with the casing and inner cutter, and remove it with debris removal means such as hammer grabs.

The following patent document is one of them, and as shown in FIGS. 8 to 11, the existing pile 1 made of concrete having reinforcing bars embedded in the ground is removed, and an excavation cutter 3 a is provided at the lower edge. In addition, the excavation casing 3 in which the cutter 2 is projected in the cylinder, the erection device 11 that supports the excavation casing 3 so as to be able to rotate and press fit on the upper portion of the pile, and the processed pile in the excavation casing 3 And a hammer grab 13 as debris removal means for taking out the rubble.
JP-A-8-120671 (Underground pile removing device)

  A crane 12 is installed on the ground, the hammer grab 13 is suspended from the crane 12, and the erection 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 bed 2a is composed of a triangular stay 2b provided above and below, and a triangular stay 2c provided on a side surface of the bed 2a. Strongly supported.

  Further, the cutters 2 provided at the four locations are provided with steps in the mounting depth. Further, the four cutters 2 have different protrusion lengths. In other words, the lowermost cutter 2 protrudes most, and the uppermost cutter 2 protrudes less.

  When removing the existing pile 1 buried in the ground by the device, first, the erection device 11 is installed directly above the existing pile 1 to be removed. Then, the excavation casing 3 is set in the erection device 11 to apply rotation and pressure. Then, the cutter 2 advances by crushing the whole while cutting the rebar 10 of the pile 1.

  In this way, the necessary depth, that is, the existing pile 1 is removed to such an extent that the original construction is not hindered. Thereafter, the hammer grab 13 is lowered into the excavation casing 3 to discharge the debris and earth and sand inside.

  In the underground pile removing apparatus disclosed in Patent Document 1, since the cutter 2 is cut from the top surface of the pile 1, excavation becomes extremely difficult, and a great deal of time is spent on breaking the pile 1 together with the reinforcing bars.

  In addition, this patent document 1 also describes an embodiment in which a movable cutter (copy cutter) is provided so as to protrude and retract in addition to the above-described fixed cutter 2 on the inner side of the pile 1 as the pile 1 is cut at a necessary position. However, this movable cutter is provided in a bed equipped with a hydraulic cylinder and can be moved in and out in the horizontal direction. A hydraulic pressure is applied to this bed with a high-pressure hose. If a high-pressure hose is inserted into the casing, the effective use of the casing's inner diameter will be hindered, and more work will be required to add and remove the swivel device according to the extension of the casing. Is bad.

  The following patent document is an application filed by the applicant first and obtained a patent. As shown in FIGS. 12 and 13, cutters 15 a, 15 b, ... 15e are arranged so as to be within a half circumference, and are arranged so that the protruding lengths are sequentially increased, and are arranged side by side in a row. These cutters 15a, 15b,... 15e are claw-like ones having a sharp blade made of a hard metal that is harder than the metal constituting the digging casing 3, and are firmly attached to the inner peripheral surface of the casing head 3b by welding or the like. It sticks to.

  The excavation casing 3 is fitted with a casing head 3b at the tip of a main body 3c that is added to the necessary length in the middle of the excavation casing 3, and the fitting portion is fastened with a bolt 4. The casing head 3b is provided with an excavation cutter 3a at the lower end.

And, the cutters 15a, 15b,... 15e are all or part of a plurality (in the example shown, the cutter head 15b is more from the inner peripheral surface of the casing head 3b than the concrete cover thickness from the reinforcing bar 10 of the existing pile 1 except for the cutter 15a. The protrusion length of is made large.
JP 2003-293369 (existing pile removal method and apparatus)

  In this patent document 2, the excavating casing 3 is inserted into the ground so as to surround the existing pile 1 while being swung and rotated by an erection device, and then the excavating casing 3 is rotated all around and the cutters 15a and 15b are rotated. , ... 15e, the existing pile 1 is cut from the outer periphery, and the existing pile that has been treated with debris removing means such as a hammer grab is taken out.

  In Patent Document 2, since the pile can be removed without greatly excavating the periphery of the pile, there is no possibility of harming the housing environment of neighboring residents due to sound or vibration, and even if there is a reinforcing bar in the pile. Since it can cut | disconnect reliably, and also it can cut | disconnect in a required depth, without destroying the whole pile, work efficiency can be improved significantly.

  In the existing pile removing method and apparatus of Patent Document 2, since the existing pile 1 is inserted into the ground while being swung and rotated so as to surround the eccentric pile 1, it takes time for excavation. In addition, excavation may be difficult on hard ground. Furthermore, excavation becomes more difficult as the diameter becomes larger.

  The present invention eliminates the disadvantages of the conventional example, the excavation cycle is fast, the entire work time is shortened, the work on the hard ground is easy, the work of large diameter is possible, and all the reinforcing bars It is an object of the present invention to provide an existing pile breaking method and apparatus that can be easily removed by a hammer grab.

  In order to achieve the above object, the present invention provides a method for destructing an existing pile by encircling the existing pile while eccentrically surrounding the excavating casing having a cutter projecting from the inner peripheral surface of the casing head while swinging and rotating with an erection device. In the existing pile removal method in which the excavation casing is rotated while being inserted into the ground and the existing pile is cut off from the outer peripheral portion by the cutter, the cutter is slidable in the vertical direction by a holder provided on the inner peripheral surface of the casing head. Uses the existing pile breaking device with the cutter slide surface inclined so that the cutter slides inwardly as the cutter moves downward, and the casing head aligned with the pile core is rotated and lowered to the top of the holder. Cut the outer periphery of the pile with the cutter located, then lift the casing head and rotate it at that position, under the holder It is an gist cutting the reinforcement of an existing pile cutter located.

  Moreover, as an existing pile breaking device, firstly, a device for removing an existing pile buried in the ground, a drilling casing having a cutter projecting from the inner peripheral surface of the casing head, and this casing In the existing pile removing device comprising an erection device that supports the existing pile so as to be swingable and rotatable, the cutter is slidable in a vertical direction by a holder provided on the inner peripheral surface of the casing head, and the holder holds the cutter. The cutter slide surface is inclined so that it protrudes inward from the casing head as it is moved downward. Second, the cutter located at the lowermost end of the holder has a tip that is larger than the diameter of the reinforcing bar on the existing pile. In addition, the gist is to reach the inside, and thirdly, the cutter is disposed downward on the bottom bottom outer surface of the holder.

  According to the first to third aspects of the present invention, while rotating the casing head, the outer periphery of the pile (the outer diameter of the pile to a range where the reinforcing bar does not hit) is cut with a cutter located at the upper part of the holder, and then the casing head is moved. When the cutter is lifted, the cutter moves to the lower part of the holder, so it can be rotated at that position, and the existing reinforcing bar can be cut with the cutter.

  According to the fourth aspect of the present invention, even if the holder protrudes inward of the casing head, the cutter is disposed downward on the bottom surface of the lower end of the holder, so that the obstacle is removed by cutting the lower side of the protrusion. be able to.

  As described above, the existing pile demolition method and apparatus of the present invention has a fast excavation cycle, and as a result, the entire work time can be shortened, and the work can be easily performed even on hard ground. In addition, since all the reinforcing bars can be cut, the removal work with a hammer grab can be facilitated.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a longitudinal side view showing an embodiment of an existing pile breaking apparatus according to the present invention, FIG. 2 is a plan view of the same, and 3 is a excavating casing, and a main body part which is added as needed and is midway. The casing head 3b is fitted to the tip of 3c, and the fitting portion is fastened with a bolt 4. The casing head 3b is provided with an excavation cutter 3a at the lower end.

  As shown in FIGS. 3 and 4, the excavating casing 3 is rotatably supported by an erection device 11. As is well known, this erection device 11 is a press-fitting machine used in, for example, the all-casing method, and a chuck device 5 for tightening the outer periphery of the excavation casing 3 in a ring shape on the reaction force frame 9 and the chuck device 5 are rotationally driven. A driving device 6 such as a motor 6a and a speed reducer 6b, and an elevating cylinder 7 using a hydraulic cylinder that moves the chuck device 5 and the driving device 6 up and down are provided. In the figure, 8 indicates an outrigger by a horizontal jack on which the erection device 11 is installed horizontally.

  The excavation casing 3 is rotationally propelled while being chucked on the outer periphery by the erection device 11 and inserted into the ground.

  In the present invention, in addition to such a configuration, the holder 16 is provided on the inner peripheral surface of the casing head 3b at the tip of the excavating casing 3 so as to be inclined upward and downward in the vertical direction.

  The holder 16 holds the cutter 18 so as to be slidable in the vertical direction, and the cutter slide surface 17 is inclined so as to protrude inward of the casing head 3b as the cutter 16 is moved downward.

  As an example, the cutter 18 has a substantially rectangular base plate 18a formed with a horizontal letter-shaped blade portion 18b as shown in FIG. 4, and the base plate 18a has left and right thin-walled engaging portions 18c of a vertically long rectangular holder 16. The left and right U-shaped cross-section rail grooves 16a are inserted from the lower end openings. The blade portion 18b has a certain thickness, and in the present embodiment, the central portion of a horizontal character is dented into a square shape, and carbide tips are arranged at the left and right tip portions.

  The upper end of the rail groove 16a having the U-shaped cross section is closed, and the thin engaging portion 18c of the cutter 18 does not come out upward, and the cylindrical pin 19 is prevented from coming out between the lower end openings. As a stopper, it was detachably disposed. The base plate 18a was formed with a semicircular notch to which the pin 19 is engaged.

  In this way, the cutter 18 can move by the stroke S between (A) and (B) above and below the holder 16.

  Further, the cutter 18 positioned at the lowermost end (B) of the holder 16 is such that the tip of the blade portion 18b reaches inward from the arrangement ring diameter of the reinforcing bars 10 of the existing pile 1 as shown in FIG.

  Note that one or several holders 16 and cutters 18 are provided at intervals on the inner peripheral surface of the casing head 3b in accordance with the situation of the existing pile 1 to be cut.

  The cutter 20 was also disposed downward on the bottom surface of the lower end of the holder 16. This cutter 20 may be the same as the excavation cutter 3a.

  Next, the destruction method of the existing pile of this invention performed using such an apparatus is demonstrated. As shown in FIG. 5, the outer periphery of the existing pile 1 is often uneven in an existing cast-in-place pile.

  As shown in FIG. 6, when the vertical casing head 3 b is rotated in accordance with the pile core of the existing pile 1 and excavated, the cutter 18 is pushed up to the position (A) in a state where it is inserted about m in FIG. 2. At that time, the cutter 18 cuts the outer periphery of the existing pile 1 by m.

  As shown in FIG. 7, at the cutting position (B), the casing head 3b is pulled up and rotated, and the pulling-rotation-pickup is repeated several times up to the stroke S in FIG. The n bar is inserted and the rebar 10 is cut. Further, the pile is separated by the thickness of the cutter 18.

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

It is a vertical side view which shows one Embodiment of the destruction apparatus of the existing pile of this invention. It is a top view which shows one Embodiment of the destruction apparatus of the existing pile of this invention. It is a front view of a holder. It is 3 direction explanatory drawing of a cutter. It is explanatory drawing of the existing pile before giving the destruction method of the existing pile of this invention. It is explanatory drawing of the 1st process of the destruction method of the existing pile of this invention. It is explanatory drawing of the 2nd process of the destruction method of the existing pile of this invention. It is a side surface which shows the erection apparatus and excavation casing which are used with the destruction apparatus of the existing pile of this invention. It is a top view which shows the erection apparatus and excavation casing which are used with the destruction device of the existing pile of this invention. It is a perspective view which shows a prior art example. It is a top view of a prior art example. It is a vertical side view of a prior art example. It is the schematic which shows the construction state of a prior art example. It is a vertical side view which shows another prior art example. It is a top view which shows another prior art 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 ... Main part 4 ... Bolt 5 ... Chuck device 6 ... Drive device 6a ... Motor 6b ... Reduction gear 7 Elevating cylinder 8 Outrigger 9 Reaction force frame 10 Reinforcing bar 11 Built-in device 12 Crane 13 Hammer grab 14 Bar 15a-15e Cutter 16 Holder 16a Rail groove 17 Cutter slide surface 18 Cutter 18a ... base plate 18b ... blade 18c ... thin engagement part 19 ... pin 20 ... cutter

Claims (4)

  The excavation casing with the cutter projecting on the inner peripheral surface of the casing head is swung and rotated by an erection device, while the existing pile is eccentrically surrounded and inserted into the ground while rotating the excavation casing, and the existing pile is surrounded by the cutter. In the method of removing existing piles cut from the part, the cutter is slidable in the vertical direction by a holder provided on the inner peripheral surface of the casing head, and this holder is protruded inward of the casing head as the cutter is moved downward Using the existing pile breaking device with the cutter slide surface inclined, the casing head aligned with the pile core is rotated and lowered to cut the outer periphery of the pile with the cutter located at the top of the holder, and then the casing head is pulled up Rotate in position and cut the existing pile rebar with the cutter located at the bottom of the holder Destruction method of Sonkui.   An apparatus for removing an existing pile buried in the ground, and a drilling casing having a cutter projecting from an inner peripheral surface of a casing head, and supporting the casing in a swingable and rotatable manner around the existing pile. In an existing pile removing device comprising an erection device, the cutter is slidable in a vertical direction by a holder provided on the inner peripheral surface of the casing head, and the holder protrudes inward of the casing head as the cutter is moved downward. An existing pile breaking device characterized in that the cutter slide surface is inclined as described above.   The existing pile breaking device according to claim 2, wherein the cutter positioned at the lowermost end of the holder has a tip that reaches an inner side of a reinforcing bar arrangement diameter of the existing pile.   The existing pile breaking device according to claim 2 or 3, wherein a cutter is disposed downward on an outer bottom surface of the lower end of the holder.

Images