JP2012007354A - Underground buried object removal method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of providing a cut line in an underground object that allows the underground object to be cut and separated without requiring a large force during lift with a hammer grab or the like.SOLUTION: An underground buried object removal method comprises: positioning an excavating casing 1, in which a plurality of cutters are arranged in a line on an inner peripheral surface of a casing head at a prescribed angle from a horizontal direction, eccentrically to an existing pile 100 so that the pile is far away from the cutters on the inner peripheral surface while the pile is close to the inner peripheral surface side where the cutters do not exist; swinging the excavating casing 1 so as to press the casing into the ground to the cutting position of the existing pile 100 without allowing the cutters on the inner peripheral surface of the excavating casing 1 contact the existing pile 100; rotating the excavating casing 1 all around so that a wedge-shaped cut groove is formed by the cutters from the outer periphery toward the inner periphery of the existing pile 100; and cutting the existing pile 100 and taking out a cut pile 100a.

Description

  The present invention relates to a method for removing underground buried objects such as reinforced concrete piles buried in the ground.

  Concrete piles buried in the foundation of a concrete building need to be removed after destroying and removing the building. In concrete piles, a plurality of reinforcing bars embedded in the longitudinal direction of the pile are arranged in an annular shape.

  Therefore, concrete piles need to be excavated from the outer periphery to a depth where the reinforcing bars are buried to cut the reinforcing bars.

  As an apparatus for cutting such a concrete pile, Patent Document 1 discloses that a plurality of cutters having different projecting widths are provided at different heights in a circumferential direction on a lower inner periphery of a casing that is rotationally driven by a casing driver. An underground pile removing device is disclosed in which the piles are excavated and crushed from the top into concrete debris by dispersing and arranging and rotating the casing.

  However, in the underground pile removing apparatus described in Patent Document 1, excavation becomes extremely difficult because the cutter cuts from the upper surface of the pile, and there is a problem that it takes a lot of time to break the pile. It was.

  Patent Document 1 described above also describes an embodiment in which a movable cutter (copy cutter) is provided so as to be able to advance and retreat in addition to the above-described fixed cutter on the inner side of the pile as the pile is cut at a necessary position. Yes. However, this movable cutter is installed in a bed with a hydraulic cylinder and can be moved in and out in the horizontal direction, and hydraulic pressure is applied to this bed with a high-pressure hose, which requires a hydraulic swivel. In addition, if a high-pressure hose is inserted into the casing, the effective use of the inner diameter of the casing is hindered, and further, the work of adding the hose according to the addition of the casing, the installation and removal of the swivel device, etc. increases, resulting in poor work efficiency.

  Moreover, since the movable cutter is movable, it is difficult to make the cutter itself and the mechanism that supports the cutter robust enough to withstand the cutting of concrete and rebar, and two cutters are provided symmetrically on the inner periphery of the casing. Even if it cuts a rebar, the burden concerning one cutter is large, and it is difficult to cut a rebar easily.

  In order to eliminate the inconvenience of the conventional example described above, the excavation casing having a cutter projecting on the inner peripheral surface of the casing head is swung and rotated by a casing driver, and the existing pile is decentered without contacting the existing pile. Insert into the ground to the cutting position so as to surround, then rotate the entire circumference of the excavating casing, cut the existing pile horizontally from the outer periphery with the cutter, and take out the existing pile that has been treated with debris removal means such as hammer grabs A pile removal method has been proposed (see, for example, Patent Document 2).

JP-A-8-120671 Japanese Patent No. 3683229

  In the construction method of Patent Document 2 described above, the cutter protruding from the inner peripheral surface of the casing head is inserted into the ground while swinging and rotating without contacting the existing pile until the position (depth) at which the pile is to be cut. Next, when the position to be cut is reached, the excavation casing is rotated all around, and the cutter that does not hit hits the outer circumference of the existing pile and cuts horizontally from the outer circumference. After that, the existing piles that have been treated with debris removal means such as hammer grabs are taken out.

  In the thing of above-mentioned patent document 2, since it is comprised so that it may cut | disconnect horizontally from an outer peripheral part in the position to cut | disconnect, a pile will be in the state which made the cut partly horizontally. For this reason, in the pile, the weight of the pile portion cut downward by gravity is applied to the cut as it is, and the position of the embedded state is maintained. Therefore, when taking out the pile with a hammer grab or the like, it is necessary to pull away the concretion portion of the pile without any cuts to separate it. For this reason, there is a problem that a large force is required when pulling up with a hammer grab or the like.

  The present invention has been made in view of the above-described conventional problems, and the underground buried object is cut by cutting the underground buried object such as a pile, and the underground buried object is separated when pulled up by a hammer grab or the like. An object of the present invention is to provide a method for removing an underground burial body that does not require a large force.

  According to the method for removing an underground buried body of the present invention, a drilling casing in which a plurality of cutters are arranged in a row at a predetermined angle from the horizontal direction on the inner peripheral surface of the casing head is kept away from the cutter on the inner peripheral surface, and Arranged eccentrically with respect to the underground buried object in the state of approaching the inner peripheral surface side where no cutter exists, and swinging the excavating casing without bringing the cutter on the inner peripheral surface of the excavating casing into contact with the underground buried object And then press-fitting into the ground to the cutting position of the underground buried body, and then rotating the excavating casing all around and forming a wedge-shaped kerf from the outer periphery to the inner periphery of the underground buried body by the cutter The buried body is cut, and the cut underground buried body is taken out.

  Further, the plurality of cutters are arranged in a line on the inner peripheral surface of the casing head with a predetermined interval and an angle of 2 ° to 3 ° with respect to the horizontal direction so as to be within a half circumference. What is necessary is just to comprise.

  According to the present invention, the excavation casing and the casing head are set at an eccentric position at a position surrounding the underground buried body with respect to the underground buried body, and swung to a position (depth) at which the underground buried body is to be cut. Press into the ground while rotating. At this time, the cutter protruding from the inner peripheral surface of the casing head does not contact the underground structure. Next, when the excavation casing is rotated all around when reaching the position to be cut, the cutter that does not hit the hitting hits the outer periphery of the underground buried body and cuts by forming a wedge-shaped kerf from the outer peripheral portion toward the inner peripheral portion. Then, the underground buried object cut with a hammer grab is taken out.

  Further, since the excavation is rocking excavation, there is no occurrence of co-rotation of the piles, and it is possible to reliably excavate the surroundings of the underground buried body to the position where it is desired to cut and rotate and cut at that position.

  And since the cutter fits in the inner circumference of the casing within the half circumference, if the other half circumference surface is brought close to the underground buried body, the casing head can be swung and rotated without contacting the underground buried body. it can. Further, since the cutters are sequentially arranged at a predetermined angle, the cutting is performed so as to make a cut in the wedge shape, and the underground buried body is folded in a dogleg shape along the wedge-shaped cut. By making the wedge-shaped cut, the underground buried body is bent and broken in the direction of the wedge due to the weight of the upper underground buried body. Therefore, there is no need to separate the existing piles by pulling them separately with a hammer grab or the like, and cutting can be performed reliably and quickly.

  As described above, according to the present invention, by making a wedge-shaped cut in the underground buried body, the underground buried body bends in the direction of the wedge and breaks due to the weight of the upper part. Therefore, it is not necessary to separate the existing piles by vertically pulling with a hammer grab or the like, and the work efficiency can be greatly improved because it can be cut surely and quickly.

It is a vertical side view which shows 1st Embodiment of the removal apparatus of the underground burial body of this invention. It is a side view which shows the installation state of the full turning excavator used for embodiment of the removal apparatus of the underground burial body of this invention. It is a top view which shows the ruler iron plate used with embodiment of the removal apparatus of the underground burial body of this invention. It is a top view which shows 1st Embodiment of the removal apparatus of the underground burial body of this invention. It is a schematic sectional drawing which shows the removal method of the underground burial body of this invention according to a process. It is a top view which shows the installation state of the full turning excavator, reaction force apparatus, and crawler crane used for embodiment of the removal apparatus of the underground burial body of this invention. It is a side view which shows the full turning excavator and excavation casing which are used for the removal apparatus of the underground burial body of this invention. FIG. 5 is a side view showing a state where the excavation casing is rocked and press-fitted in the underground buried body removing apparatus of the present invention. It is a side view which shows the state which makes the excavation casing fully rotate and is making the pile cut | disconnect in the removal apparatus of the underground burial body of this invention. It is a side view which shows the state which has taken out the cut pile in the removal apparatus of the underground burial body of this invention. It is a side view which shows the state which takes out the cut pile after extending a digging casing in the removal apparatus of the underground burial body of this invention. It is a vertical side view which shows 2nd Embodiment of the removal apparatus of the underground burial body of this invention.

  Embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and the description thereof will not be repeated in order to avoid duplication of description.

  FIG. 1 is a longitudinal side view showing a first embodiment of the underground buried body removing apparatus of the present invention, and FIG. 4 is a plan view of the same.

  In the excavated casing 1 used in the present invention, a casing head 11 is fitted at the tip of a main body 10 that is added to a required length, and the main body 10 and the casing head 11 are fastened by bolts 12. Moreover, the casing head 11 is provided with an excavation cutter 13 at the lower end.

  As shown in FIGS. 4 to 7, the excavation casing 3 is supported by an all-round excavator (casing driver) 3 so as to be swingable and rotatable.

  As is well known, this all-round excavator 3 is a press-fitting machine used in, for example, the all casing method. As shown in FIG. 2, this all-swivel excavator 3 has guide posts 33 standing at four corners on a base frame 32 installed horizontally by jacks 31, and hydraulic cylinders ( A lifting frame 34 that is lifted and lowered by a not shown) is attached. A rotating body that is rotationally driven by a hydraulic motor (not shown) via a power transmission device such as a gear mechanism (not shown) is installed on the elevating frame 34. The rotating body has a cylindrical shape through which the casing 3 can be inserted. The rotating body includes a chuck device having a movable band that is opened and closed by a hydraulic cylinder or the like (not shown).

  The full turn excavator 3 is positioned and laid by the crawler crane 5 on the full turn jack part tray 21 of the ruler iron plate 2.

  The excavation casing 1 is rotationally propelled while being chucked on the outer periphery thereof by the all-swivel excavator 3 and is press-fitted into the ground.

  As shown in FIGS. 6 to 11, a reaction force device 4 is attached to the all-round excavator 3. Since all the rotary excavator 3 generates a force that rotates in the same direction as the rotation direction, the reaction force device 4 receives the reaction force on the main body of the crawler crane 5 and suppresses the rotation.

  In the present invention, as shown in FIGS. 1 and 4, a predetermined interval is provided on the inner peripheral surface of the casing head 11 at the tip of the digging casing 1 so that the cutters 14a, 14b,. In addition, they are arranged in a row with a predetermined angle (θ) upward from the horizontal direction. This angle (θ) may be appropriately selected within a range of 2 ° to 3 °, and is 2.5 ° in this embodiment. These cutters 14a, 14b,... 14e are arranged in order so that the protruding length becomes longer. These cutters 14a, 14b,... 14e are claw-like ones having sharp blades made of a hard metal that is harder than the metal constituting the digging casing 1, and are firmly attached to the inner circumference of the casing head 11 by welding or the like. Attach to the surface.

  The cutters 14a, 14b,... 14e are more or less from the inner peripheral surface of the casing head 11 than the concrete cover thickness h from the reinforcing bar 101 of the existing pile 100 as an underground buried body. The protruding length is increased. In this embodiment, the cutters are arranged so that the protruding lengths are sequentially increased from the smallest cutter 14a.

  The number of the cutters 14a, 14b,... 14e is determined by the diameter of the casing head 11, and the diameter of the casing head 11 matches the diameter of the existing pile 100 and the maximum length of the cutter 14e with a gap length that is more constant. Shall.

  Next, the method of removing the existing pile 100 using this excavation casing 1 is demonstrated. Here, the existing pile 100 shows the concrete pile (Prefabricated piles, such as PC and RC, field construction pile) which has a reinforcing bar inside as a structure embed | buried in the ground. The diameter of the existing pile 100 that can be processed depends on the diameter of the excavation casing 3, but is preferably within a few meters from the viewpoint of ease of processing.

(1) Pile head excavation Excavate the part with a hydraulic excavator, etc., check the pile head position, pile diameter and main reinforcement of the existing pile 100 to be removed, and backfill. At this time, in order to install the all-turn excavator 3 eccentrically with respect to the existing pile 100, the position of the pile mandrel 23 is installed, and the installation position of the all-turn excavator 3 is confirmed. As shown in FIGS. 2 and 3, the pile mandrel 23 is installed at the center of the ruler iron plate 2 on which the all-turn excavator 3 is placed. This position is the intersection of the lines 22 in the X and Y directions at the center of the circular hole that can penetrate the casing. Also, instead of the pile mandrel 23, the installation position of the all-round excavator 3 is set to the center of the penetrable circular hole of the casing provided at the center of the ruler iron plate 2 with a thread or reinforcing bar along the X and Y direction lines. You may align it at the point of intersection.

(2) Installation of all-swivel excavator As shown in FIGS. 2 and 5A, the all-swivel excavator 3 is placed on the guide provided on the ruler iron plate 2 so that the four corners of the all-swivel excavator 3 are aligned. The swivel excavator 3 is installed by aligning the center of the swivel excavator 3 with the ruler iron plate 2 installed using the pile mandrel 23 indicating the center of the swivel. Further, as shown in FIG. 6, a reaction force device 4 is connected to and attached to the all-turn excavator 3, and the reaction force device 4 and the crawler crane 5 come into contact with each other so that the excavation reaction force can be obtained. .

(3) Construction of Excavation Casing 1 As shown in FIG. The excavation casing 1 is built by being hung on the rope 51 of the crawler crane 5. The excavation casing 1 and the casing head 11 are set at a position eccentric with respect to the existing pile 100. At this time, as shown in FIG. 4, the existing pile 100 is moved away from the cutters 14 a, 14 b,... 14 e and approaches the inner peripheral surface side of the excavation casing 1 where the cutters 14 a, 14 b,.

(4) Press-in of Excavation Casing 1 As shown in FIGS. 5B and 8, the casing 5 is swung to the target cutting depth of the pile 100 by the full-slewing excavator 3 and press-fitted. The outer periphery of the excavation casing 1 is fastened and fixed by the chuck device of the all-round excavator 3, and the chuck device 5 and the casing head 11 are attached to the existing pile 1 at the same time as the chuck device 5 is rotated (oscillated) left and right by the driving device. Press fit into the ground around the outer periphery. In the press-fitting of the excavating casing 1, the cutters 14 a, 14 b,... 14 e provided on the inner peripheral surface of the casing head 11 and the pile 100 rotate (oscillate) to the left and right without being in contact with each other.

  The excavation with the excavation casing 3 is performed to a depth (several meters) at which the existing pile 100 is to be cut. The depth of several meters is a length by which the weight of the cut existing pile 100 a can be taken out by the hammer grab 52.

(5) Formation of cutting groove Next, as shown in FIG. 5C and FIG. 9, when the position of several meters to be cut is reached, the excavation casing 3 is moved all around in one direction by the all-round excavator 3. Rotate. As a result, the cutters 14a, 4b,... At this time, since the cutters 14a, 14b,... 14e are arranged in a line with a predetermined angle (θ) upward from the horizontal direction, the outer periphery of the existing pile 100 is wedge-shaped from the horizontal direction to the upward direction. A kerf is formed. The reinforcing bars 101 are cut by the cutters 14 a, 14 b,... 14 e, and a wedge-shaped kerf is formed from the outer periphery of the pile 100 toward the inner periphery. The existing pile 100 is cut into a square shape. In addition, 50-100 mm is suitable for the thickness of cutter 14a, 14b, ... 14e.

(6) Removal of the cut pile Next, as shown in FIGS. 5 (d), 5 (e) and 10, the hammered grab 52 supported by the rope 51 holds the cut pile 100a and Pull up and remove.

(7) Casing addition Next, as shown in FIG. 11, the casing main body 10 is added. And the process of said (3) thru | or (7) is repeated until all the existing piles 100 are removed.

  In this way, underground buried objects such as piles buried underground can be removed.

  Next, a second embodiment of the present invention will be described. FIG. 12 is a longitudinal side view showing a second embodiment of the underground buried body removing apparatus of the present invention.

  As in the first embodiment, the excavation casing 1 used in the second embodiment is also fitted with a casing head 11 at the tip of the main body 10 to be added to the required length, and the main body 10 and the casing head 11 are: Fastened with bolts 12. Moreover, the casing head 11 is provided with an excavation cutter 13 at the lower end.

  The second embodiment of the present invention has a predetermined interval on the inner peripheral surface of the casing head 11 so that the cutters 14a, 14b,... θ) and arranged in a line. Other configurations are the same as those of the first embodiment.

  As in the second embodiment, a wedge-shaped kerf is formed from the outer periphery to the inner periphery of the existing pile 100 even when the excavation ceiling 1 in which the cutters 14a, 14b,. As with the first embodiment, the existing pile 100 can be cut into a dogleg shape.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims for patent.

DESCRIPTION OF SYMBOLS 1 Excavation casing 10 Casing main body 11 Casing head 13 Excavation cutter 14a, 14b, ... 14e Cutter 2 Ruler iron plate 3 Full turning excavator 4 Reaction force apparatus 100 Pile 101 Reinforcing bar

Claims (2)

  A state in which the excavation casing in which a plurality of cutters are arranged in a row at a predetermined angle from the horizontal direction on the inner peripheral surface of the casing head is away from the cutter on the inner peripheral surface and approaches the inner peripheral surface side where no cutter exists The excavation casing is arranged eccentrically with respect to the underground buried body, the cutter on the inner peripheral surface of the excavation casing is not brought into contact with the underground buried body, the excavation casing is swung, and the ground is cut to the ground cutting position. Then, the excavation casing is rotated all around and a wedge-shaped kerf is formed from the outer circumference to the inner circumference of the underground buried body by the cutter to cut the underground buried body, and the cut underground buried A method for removing an underground buried body, wherein the body is taken out.   The plurality of cutters are arranged in a line on the inner peripheral surface of the casing head, having a predetermined interval so as to be within a half circumference, and having an angle of 2 ° to 3 ° from the horizontal direction. The method for removing an underground buried body according to claim 1, wherein:

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