JP2010065405A - Method and device for removing obstacle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and a device for removing an existing pile and the other obstacles remaining in the ground which can reasonably perform the construction by efficiently and reliably excavating by a hammer grab and cutting with a cutter effectively utilizing a casing. <P>SOLUTION: A guide rail 4 is longitudinally attached to the inside of the all-around rotating casing 1 with an excavating blade 2 at the front end. The casing 1 is rotated and pressed into the ground. Along the guide rail 4, the hammer grab 7 is lowered into the casing 1, and the excavation is performed. After the side of an underground obstacle 13 is excavated, the hammer grab 7 is raised, the cutter 10 is lowered into the casing 1 along the guide rail 4, and the casing 1 is rotated to cut the obstacle 13. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a construction method for removing existing piles and other obstacles left in the ground, and an apparatus used therefor.

  In redevelopment of urban areas and rebuilding of buildings, the ground parts of existing buildings are dismantled and the existing underground piles and underground parts that supported the buildings are removed.

  Taking an existing underground pile as an example, the existing underground pile buried in the ground for a long period of time is firmly fixed to the ground, so when removing the existing underground pile, It is necessary to reduce the frictional resistance during

As an existing underground pile removal method, as shown in Non-Patent Document 1 below, an underground removal method (MRO method) is known in which a cutter bit is attached to the tip of the casing and an underground obstacle is cut and removed by rotating all around. ing.
“Mitsubishi Construction Co., Ltd. Technical Research Institute”, [online], January 2002, Japan Electric Power Engineering Association, [searched July 9, 2008], Internet <URL: http: //www.jepoc. or.jp/pub/1401/1401-34.htm>

  The removal method of an existing underground pile using the underground fault removal method proposed in Non-Patent Document 1 is that the casing (tube) disposed so as to surround the outer periphery of the existing underground pile is dug into the ground. After removing the soil around the existing underground pile in the casing tube with a hammer grab, the frictional resistance between the existing underground pile and the pile surrounding ground is reduced, and then the existing underground pile is put on the ground. It is described as a method of raising.

The following Patent Document 1 has been proposed as a solution to the problems of Non-Patent Document 1. That is, the removal method of the existing underground pile of Non-Patent Document 1 requires that many days and labor are required for removing the existing underground pile, and the pile ground is fluidized by the pressure fluid injected from the pressure fluid injection port. Or it is going to implement | achieve cost reduction and easy by making it muddy.
JP 2007-332559 A

  Patent Document 1 discloses a casing tube having a drilling blade having an inner diameter larger than a pile diameter of a concrete pile buried in the ground at a lower end and a pressure fluid injection port provided at a tip portion of the outer periphery of the concrete pile. Is set in an all-round rotary excavating machine so as to surround the pile, excavating the pile ground while injecting high-pressure water from the pressure fluid injection port, and lifting the concrete pile to the ground.

  In the underground fault removal method (MRO method) of Non-Patent Document 1, as shown in FIG. 13 of Patent Document 1, the hammer grab is only suspended from the crawler crane and suspended. It is unstable due to positioning and other reasons to remove the soil around the existing underground pile using the hammer grab.

  Moreover, the cutting of the existing underground pile is cut in the vertical direction by the casing tube, and the long one is cut in the long direction, so that the efficiency is extremely poor.

  Patent Document 1 discloses a method of crushing a concrete pile by hanging a rotating bucket suspended from a crawler crane on the ground and threading the concrete pile to a short length using the rotating bucket. The work that must be suspended is a cumbersome and time-consuming work.

  The object of the present invention is to eliminate the inconvenience of the conventional example, and to efficiently use the casing, and to efficiently and reliably perform excavation with a hammer grab and cutting with a cutter, thereby enabling rational construction. It is to provide an obstruction removal method and apparatus.

  In order to achieve the above object, the present invention, as an obstacle removal method, firstly, a guide rail is attached in the length direction inside an all-round rotating casing having an excavating blade at the tip, and the casing is rotated to enter the ground. Press to insert the hammer grab along the guide rail into the casing for excavation. After excavating the side of the underground obstacle, pull up the hammer grab and lower the cutter into the casing along the same guide rail. The gist is to cut the underground obstacle by rotating the casing.

  Secondly, the guide rail is provided with a stopper at the lower end, and the hammer grab and the cutter are lowered until they come into contact with the stopper, and thirdly, the cutter is inside the large arc side corresponding to the inner circumference of the casing. Is formed by a horizontal plate having a substantially isosceles triangle shape with a small arc side curved in a straight line, and a blade is formed in the vicinity of the coupling corner of the small arc side. Fourth, the cutter has a different projection length. The gist is to prepare a plurality of objects, change the length of the protrusions from the short one to the long ones, and lower the plurality of times to cut the underground obstacle.

  As the obstacle removing device, a casing having a digging blade at the tip and having a guide rail mounted in the length direction on the inside thereof and a guide rail engaging portion are provided, and a guide for the casing is provided by the engaging portion. A hammer grab that can be lowered along the rail and a guide rail engaging portion are provided, and a horizontal plate body having a substantially isosceles triangle shape by a small arc side curved inward with respect to a large arc side corresponding to the inner circumference of the casing. The gist of the invention is that it comprises a cutter having a blade formed in the vicinity of a connecting corner of a small arc side.

  According to the first and fifth aspects of the present invention, an all-round rotating casing having an excavating blade at the tip is inserted into the ground, and then the hammer grab is lowered into the casing along the guide rail. Since excavation can be performed, stable excavation can be performed by the hammer grab with the hammer grab attached to the inside of the casing via the guide rail. The same guide rail can be used to lower the cutter into the casing, and the cutting of the underground obstacle with the cutter can be performed via the guide rail by rotating the casing.

  According to the second aspect of the present invention, in addition to the above action, the guide rail is provided with a stopper at the lower end, so that the hammer grab and the cutter can be lowered until they come into contact with the stopper, thereby easily positioning the lowered position. Can be.

  According to the third aspect of the present invention, it is possible to provide a cutter having a reasonable shape as being installed in the casing and capable of being cut by either forward or reverse rotation of the casing.

  According to the fourth aspect of the present invention, a plurality of cutters having different projection lengths are prepared, and the cutter is changed from a short projection length to a long one and lowered several times, and an underground obstacle is removed. By cutting, it can cut reliably.

  As described above, the obstacle removal method and apparatus according to the present invention makes efficient construction by efficiently and reliably performing excavation with a hammer grab and cutting with a cutter by effectively utilizing the casing. It is possible.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a longitudinal front view showing the excavation process of the obstacle removing method of the present invention, FIG. 2 is a cross-sectional plan view of the same, and 1 in FIG. 7 is an excavating blade with an interval in the circumferential direction of the tip as shown in FIG. 2 is an all-around rotating casing (tube).

  The casing (tube) 1 is driven by being set in an all-round rotary excavating machine 3 as shown in FIG. 6, and is rotated around the circumference in the circumferential direction using the all-round rotary excavating machine 3. Drill with rotary press-fitting.

  In the present invention, the guide rail 4 is attached along the length direction of the casing 1 on the inner surface of the casing 1. As shown in FIG. 7, the guide rail 4 may be the same as the rail used on the railroad track, or the same shape.

  A stopper 5 made of an iron plate locking piece or the like is formed at the lower end of the guide rail 4 so that a member engaged with the guide rail 4 with a groove does not come out from the lower end. The position of the stopper 5 is about 50 cm above the lower end of the inner surface of the casing 1.

  In the figure, 6 is an inner cutter provided on the inner surface of the casing 1.

  In the figure, reference numeral 7 denotes a hammer grab. An elongated guide 8 is attached as a guide rail engaging portion in which an engaging groove 9 as shown in FIG. 8 is formed in the vertical direction behind the hammer grab 7.

  FIG. 3 is a longitudinal front view showing an excavation process of the obstacle removing method of the present invention, FIG. 4 is a cross-sectional plan view of the same as above, and 10 in the figure is a guide formed with an engaging groove 11 as an engaging portion of the guide rail 4. The cutter 10 is a cutter that can be lowered in the casing 1 along the rail 4. The cutter 10 has a substantially isosceles triangular shape by a small arc side 10 b that curves inward with respect to a large arc side 10 a corresponding to the inner periphery of the casing 1. The blade 12 is formed in the vicinity of the connecting corner between the small arc sides 10b. The blades 12 exist on the left and right sides by being provided on the left and right small arc sides 10b.

  Although the engaging groove 11 may be provided directly in the cutter 10, the elongated guide 8 is raised on the cutter 10 as a guide rail engaging portion in which the engaging groove 9 as shown in FIG. May be.

  By engaging the cutter 10 with the guide rail 4 so as to be able to move up and down with the elongate guide 8 interposed therebetween, the cutter 10 can be securely engaged with the guide rail 4 with a necessary length secured. This is suitable when the cutter 10 is moved together with the rotation of 1 to perform the cutting action.

  Although illustration is omitted, a plurality of cutters 10 having different sizes, that is, different projection lengths are prepared.

  As described above, the obstacle removing device according to the present invention includes the entire rotating casing 1 having the excavating blade 2 at the tip and the guide rail 4 attached to the inside in the length direction, and the engaging portion of the guide rail 4. A hammer grab 7 that can be lowered along the guide rail 4 of the casing 1 by this engaging portion and an engaging portion to the guide rail 4 are provided, and the inner side with respect to the large arc side 10a corresponding to the inner periphery of the casing It is formed of a horizontal plate body having a substantially isosceles triangle shape by a small arc side 10b that is curved in a straight line, and includes a cutter 10 in which a blade 11 is formed in the vicinity of a coupling corner of the small arc side.

  Next, the obstacle removal method of the present invention performed using the obstacle removal device of the present invention will be described.

  As shown in FIGS. 1 and 2, assuming that 13 is an existing underground pile or other obstacle, the casing 1 set in the all-round rotary excavating machine 3 in the machine installation process is used as the all-round rotary excavating machine. 3 and press-fitting into the ground while rotating all around in the circumferential direction.

  The casing 1 provided with the excavating blade 2 at the lower end has a space for inserting the hammer grab 7 between the inner wall of the casing 1 and the obstacle 13 when the casing 1 is dug into the ground. Set on the circumferential rotary excavating machine 3.

  Along with the press-fitting of the casing 1, a normal hammer grab is suspended to perform soil removal and excavation.

  As the excavation progresses, another casing tube is sequentially added to the upper portion of the casing 1 having the excavating blade 2 at the lower end to continue excavation while preventing the collapse of the inner wall of the excavation mine.

  If an obstacle 13 in the ground is encountered, the excavation is stopped with a hammer grab, and the casing 1 is dug into the ground so as to surround the outer periphery of the obstacle 13 only by rotary press-fitting.

  When the tip of the casing 1 is advanced in this way, the small hammer grab 7 is lowered into the casing 1 along the guide rail 4 to perform excavation, and the side of the obstacle 13 is excavated. In order to change the position of the hammer grab 7 on the side of the obstacle 13, the casing 1 may be rotated.

  After excavation, the hammer grab 7 is pulled up along the guide rail 4, and the cutter 10 is lowered into the casing 1 along the same guide rail 4. The cutter 10 enters the space excavated by the hammer grab 7 and stops at the stopper 5 at the lower end of the guide rail 4.

  In this state, the casing 1 is rotated to cut the obstacle 13 as shown in FIG.

  As described above, the cutter 10 is prepared with a plurality of protrusions having different protrusion lengths, so that the protrusions are changed from short ones to long ones and lowered several times to cut the obstacle 13 in the ground. To do.

  The cut piece cut to about 1 m in height is pulled up with a normal hammer grab 7 or the like.

  Then, it returns to the rotation press fit of the casing 1 again, and repeats several times until the obstacle 13 is lost.

It is a vertical front view which shows the excavation process of the obstruction removal construction method of this invention. It is a cross-sectional top view which shows the excavation process of the obstruction removal method of this invention. It is a vertical front view which shows the excavation process of the obstruction removal construction method of this invention. It is a cross-sectional top view which shows the excavation process of the obstruction removal method of this invention. It is a cross-sectional top view which shows the cutting | disconnection with the cutter of the obstruction removal construction method of this invention It is a front view of an all-around rotary excavation machine. It is a perspective view of a casing. It is a perspective view of the guide rail in a casing. It is a perspective view of the guide of a guide rail.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Casing 2 ... Excavation blade 3 ... Circumferential rotation type excavation machine 4 ... Guide rail 5 ... Stopper 6 ... Inner cutter 7 ... Hammer grab 8 ... Guide 9 ... Engaging groove 10 ... Cutter 10a ... Large arc side 10b ... Small arc Side 11 ... engagement groove 12 ... blade 13 ... obstacle

Claims (5)

  A guide rail is attached in the length direction inside the all-round rotating casing with a cutting blade at the tip, and the casing is rotated to press fit into the ground, and the hammer grab is lowered into the casing along the guide rail for excavation. After excavating the side of the obstacle in the ground, the hammer grab is pulled up, the cutter is lowered into the casing along the same guide rail, the obstacle is removed by rotating the casing and cutting the obstacle Construction method.   The obstacle removal method according to claim 1, wherein the guide rail is provided with a stopper at a lower end, and the hammer grab and the cutter are lowered until they abut against the stopper.   The cutter is a horizontal plate with a substantially isosceles triangle shape with a small arc side curved inward with respect to the large arc side corresponding to the inner circumference of the casing, and a blade is formed in the vicinity of the connecting corner of the small arc side. The obstruction removal construction method of Claim 1 or Claim 2 formed.   4. The cutter according to any one of claims 1 to 3, wherein a plurality of cutters having different projection lengths are prepared, the projections are changed from short projection lengths to long ones, and lowered several times to cut underground obstacles. Obstacle removal method described in Crab.   A casing that has an excavating blade at the tip and has a guide rail in the lengthwise direction and that can rotate around the circumference, and a guide rail engaging portion are provided, and the engaging portion can be lowered along the guide rail of the casing. A hammer grab and a guide rail engaging part are provided, and the small arc side is a substantially isosceles triangular horizontal plate with a small arc side curved inward with respect to the large arc side corresponding to the inner circumference of the casing. An obstacle removing device comprising: a cutter formed with a blade in the vicinity of the joint corner of the.

Images