JP4959746B2 - Obstacle removal method casing earth removal device - Google Patents

Description

  The present invention relates to an earth removing device for an obstruction removal method casing for cutting and removing an underground obstruction with a rotating casing having a cutter bit attached to the tip.

  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, auger casing with a bit attached to the tip is inserted around the existing pile while rotating, the existing pile is cut with a cutter, and then a hammer as a debris removal means Techniques have been proposed for removing piles that have been treated with grabs.

The following non-patent document 1 is one of them, and is introduced as an underground obstacle removing method (MRO method) for cutting and removing an underground obstacle.
“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 a method of pulling up.

In addition, the following patent document is similar technology, and an excavation cutter is provided at the lower edge and a cutter is provided in the cylinder to remove the existing concrete piles with reinforcing bars embedded in the ground. The excavation casing is constructed by a built-in device that supports the excavation casing on the upper part of the pile so as to be rotatable and press-fitted, and a hammer grab as a debris removing means for taking out the treated pile in the excavation casing 3.
JP-A-8-120671 (Underground pile removing device)

Furthermore, the following patent document 2 cuts up to the rebar part of the existing pile with a so-called inner cutter in which a cutter is provided inside the casing, and removes it with a debris removing means such as a hammer grab. The idea is how to lower the position to a predetermined cutting position and hit the existing pile from the outer periphery.
Japanese Patent No. 3683229

  In this Patent Document 2, an excavating casing having a cutter projecting on an inner peripheral surface of a casing is rotated by a built-in device, and an existing pile is eccentrically decentered so as not to contact the existing pile and surround the ground to a cutting position. To be inserted into.

  In addition, the applicant previously attached Japanese Patent Application No. 2008-230671 by attaching a guide rail in the longitudinal direction inside the entire circumference rotating casing having a digging blade at the tip, so that the hammer grab is placed in the casing along the guide rail. After excavating and excavating the side of the underground obstacle, the hammer grab is pulled up, the cutter is lowered into the casing along the same guide rail, and the casing is rotated to cut the underground obstacle An object removal method and equipment were proposed.

  According to this technique, first, an all-round rotating casing having an excavating blade at the tip can be inserted into the ground, and then the hammer grab can be lowered into the casing along the guide rail to perform excavation. With the hammer grab attached to the inside of the casing through the rail, stable excavation can be performed with the hammer grab. 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.

  That is, unlike the above-mentioned Patent Documents 1 and 2, etc., the excavation casing does not have a cutter fixedly projected on the inner peripheral surface of the casing, so that the existing pile is not eccentrically brought into contact with the existing pile. No need to consider lowering to the cutting position.

  The obstacle removal method and device of the above-mentioned Japanese Patent Application No. 2008-230671 is a method in which a casing is rotated and press-fitted into the ground, a hammer grab is lowered into the casing along a guide rail, and excavation is performed. After excavating the side, the hammer grab is pulled up, the cutter is lowered into the casing along the same guide rail, and the casing is rotated to cut underground obstacles.

  Here, it is a hammer grab that is used for soil removal. As is well known, the hammer grab is composed of a frame, a fulcrum part rotatably supported by the frame, and an earthen part for scooping up the soil when rotating. A plurality of shells, an upper connection portion slidable with respect to the frame, and a connection structure in which a portion of the shell separated from the fulcrum portion is connected to the upper connection portion, and the upper connection portion slides with respect to the frame Accordingly, the shell is configured to rotate about the fulcrum portion as a fulcrum.

  As described above, the hammer grab is characterized by having a plurality of shells having a soil part for scooping up the soil, and requires a work space for rotating the plurality of shells around the fulcrum part as a narrow space. A small hammer grab that fits into the floor has a low workability due to the small amount of soil removed.

  The object of the present invention is to eliminate the inconvenience of the conventional example, eliminate the need for an opening / closing part, ensure a large opening area as much as possible, and can only excavate and evacuate even in a narrow place only by up and down movement. When the obstacle is taken into the casing, the side portion of the casing is excavated, and a simple structure for removing the obstruction removal casing for the obstruction removal method suitable for securing a space for contacting the cutting blade on the side of the obstacle is provided. It is to provide.

  In order to achieve the above object, the present invention according to claim 1 is characterized in that a guide rail is attached in the longitudinal direction inside a rotary casing having a digging blade at the tip, and the tip serving as an opening surface is obliquely cut along the guide rail at an acute angle. The gist of the present invention is to provide the drainage pipe body that can be lowered along the guide rail.

  According to the first aspect of the present invention, the earth discharging tube body is a simple cylindrical body whose tip that becomes an opening surface is obliquely cut at an acute angle, and the soil that scoops the earth like a hammer grab is used. Since there is no provision of a plurality of shells having a collar, there is no opening / closing part. In use, if it is dropped in the vertical direction, the earth and sand can be taken into the interior from the opening surface of the tip, and is lifted upward and discharged.

  Prior to such use, it is possible to perform excavation by inserting an all-round rotating casing having an excavating blade at the tip into the ground, and then lowering the hammer grab into the casing along the guide rail. It is also possible to excavate and remove the earth and sand of the upper part of the obstacle taken into the casing with the hammer grab, and then intensively excavate the side surface of the obstacle with the pipe for earth removal.

  The present invention according to claim 2 is characterized in that the diameter of the soil discharging pipe body is such that it can be placed in the remaining portion of the casing when the obstacle to be removed is taken into the casing. -The gist is to make it smaller than the obstacle diameter.

  According to the second aspect of the present invention, when the obstacle to be removed is taken into the casing as described above, the pipe for discharging soil is provided along the guide rail provided in the length direction inside the casing. It is lowered into the casing and becomes a size suitable for excavating the side of the obstacle.

  The gist of the present invention described in claim 3 is that a barbed bar with a sharp tip can be inserted into the soil discharge pipe.

  According to the third aspect of the present invention, the sand and sand can be easily discharged by inserting the barbed rod into the pipe for discharging soil from which the earth and sand is taken into the inside from the opening surface of the tip. be able to.

  The gist of the present invention described in claim 4 is that a long body having an arrowhead-shaped tip which is flat on the surface side and has a front surface which is inclined and pointed is provided as a drilling tool so as to be lowered along the guide rail. Is.

  According to this invention of Claim 4, the excavation tool as an attachment is provided, and the front-end | tip is made to earth and sand by dropping the elongate body which has an arrowhead-shaped front-end | tip as an excavation tool along a guide rail. It can be softened to make it easier to take up the earth and sand of the pipe for discharging soil.

  As described above, the earth removal device for the obstruction removal method casing according to the present invention eliminates the need for an opening and closing part, can secure a large opening area as much as possible, and can excavate and earth even in narrow places only by vertical movement. Since it is possible, it is a simple structure suitable for excavating the side part when an obstacle is taken in the casing and securing a space for contacting the cutting blade on the side surface of the obstacle.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a longitudinal front view showing an embodiment of an earth removing device for an obstruction removal method casing according to the present invention, FIG. 2 is a cross-sectional plan view of the same, and 1 in FIG. It is a rotating casing (tube) having the excavating blade 2 with a space (all circumferences).

  The casing (tube) 1 includes a casing head 1a having a digging blade 2 and a main body piece 1b which is fitted to and connected to the upper end of the casing head 1a as in a normal case. In the figure, reference numeral 6 denotes a rail portion and earth and sand loosening member, and 17 denotes a torque stopper.

  Further, the casing (tube) 1 is driven by being set in the all-round rotary excavating machine 3 as shown in FIG. 10, while being rotated all around in the circumferential direction using this all-round rotary excavating machine 3. Excavate by rotary press-fitting into the ground.

  As shown in FIGS. 11 and 12, 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 including the casing head 1a. As shown in FIG. 12, the guide rail 4 may be the same as the rail used on the railroad track, or the same shape.

  A stopper 5 is formed at the lower end (front end) of the guide rail 4 by an iron plate locking piece or the like so that a member engaged with the guide rail 4 with a groove does not come out of the lower end.

  According to the present invention, the soil removal pipe body 14 is provided so as to be lowered along the guide rail 4 by a straight pipe having a tip which is the opening surface 15 obliquely cut at an acute angle. By thus cutting obliquely, the opening surface 15 has a large elliptical area. (See Figure 3)

  The soil removal pipe body 14 is vertically arranged with the tip which becomes the opening surface 15 facing downward, and a counterweight 18 is detachably installed thereon. The shape of the counterweight 18 is not particularly limited, and it is possible to use a counterweight or the like that is used for the soap as long as it is connected to the soil removal pipe body 14 in the vertical direction.

  Then, an elongated guide 8 is attached as a guide rail engaging portion formed with an engaging groove 9 as shown in FIG. Be suspended with a wire rope or the like (not shown).

  As shown in FIG. 2, the diameter of the pipe 14 for soil removal is such that the obstacle 13 to be removed can be placed in the remaining portion of the casing 1 when the obstacle 13 to be removed is taken into the casing 1. Casing diameter-smaller than obstacle diameter.

  Next, usage will be described. As shown in FIG. 11, the installation of the casing 1 is based on the assumption that 13 in the figure is an existing underground pile or other obstacle, and as shown in FIG. The rotary excavating machine 3 is used to rotate and press into the ground while rotating in the circumferential direction.

  Note that the casing 1 having the excavating blade 2 at the lower end secures a space for inserting the soil removal pipe 14 between the inner wall of the casing 1 and the obstacle 13 when the casing 1 is dug into the ground. Is set in the all-round rotary excavating machine 3 as described above.

  In this all-round rotary excavating machine 3, the casing 1 is rotated all around or peristally, and the ground is cut and built in a ring shape while taking the earth and sand inside. A normal hammer grab is suspended using a crane or the like 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, 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.

  If the leading end of the casing 1 is advanced in this manner, the soil removal tube body 14 is dropped along the guide rail 4 and the tip cut obliquely at an acute angle is pierced into the ground. Sediment is packed.

  In this state, the wire rope is pulled up to pull up the soil removal pipe body 14 together with the inner earth and sand, and as it is raised upward in the circular drum type soil disposal bucket 19, When the tip 21 of the rod 20 is inserted into the soil removal tube 14, the soil inside the scraper 20 is scraped out and falls into the soil removal bucket 19, and is stored in the soil removal tube 14. Becomes empty.

  The arrowhead-shaped rod body 20 is formed in a triangular trapezoidal shape with tips 21 having inclined surfaces 21a on both sides, and a stubber flange 22 is formed at the root of the tip 21 so that the pipe 14 for soil removal is provided. The edge of the opening surface 15 of the soil removal tube 14 is stopped by the flange 22 when the tip is lowered and inserted into the inside.

  In this way, the soil removal tube 14 is lowered into the casing 1 to perform excavation, and the side of the obstacle 13 is excavated. In addition, what is necessary is just to rotate the casing 1 in order to change the position of the pipe 14 for earth removal on the side of the obstruction 13.

  In FIG. 8, reference numeral 10 denotes a cutter capable of forming an engaging groove 11 as an engaging portion of the guide rail 4 and descending the casing 1 along the guide rail 4, and the cutter 10 is an inner periphery of the casing 1. Is a horizontal plate having a substantially isosceles triangle shape (shaped like a ray) by a small arc side 10b curved inward with respect to the large arc side 10a corresponding to The blade 12 is formed on the surface. 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, may be prepared.

  As described above, when a plurality of cutters having different projection lengths are prepared, the cutter 10 is changed from the one with the shorter projection length to the longer one and lowered a plurality of times to cut the obstacle 13 in the ground. . The part of the obstacle 13 cut to about 1 m in height is pulled up with a normal hammer grab 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.

Furthermore, in this invention, as shown in FIG. 5, FIG. 6 as an attachment,
An elongate body having an arrowhead-shaped tip 23 having a flat back surface 23a and an inclined front surface 23b is provided as an excavating tool 24 so as to be lowered along the guide rail 4. In order to engage the excavation tool 24 with the guide rail 4, the elongated guide 8 can be used as a guide rail engaging portion in which the engaging groove 9 as shown in FIG. 13 is formed.

  Further, a horizontal plate 25 is formed at the base of the tip 23 of the excavating tool 24, and this is used as a stopper for insertion into the soil.

  In this manner, prior to the use of the soil discharge tube 14, a long body having an arrowhead-shaped tip 23 is lowered as the excavating tool 24 along the guide rail 4, so that the tip 23 is pushed against the earth and sand. If it is made soft, it is possible to facilitate the uptake of earth and sand in the soil discharge tube 14.

It is a vertical front view which shows one Embodiment of the casing for obstruction removal methods of this invention. It is a cross-sectional top view which shows one Embodiment of the casing for obstruction removal methods of this invention. It is the casing head part which shows one Embodiment of the casing for obstruction removal methods of this invention, and is a longitudinal front view which abbreviate | omitted the guide rail. It is the cross-sectional top view which abbreviate | omitted the guide rail in the casing head part which shows one Embodiment of the casing for obstruction removal methods of this invention. It is a vertical front view which shows the excavation process of the obstruction removal construction method using the casing for obstruction removal construction methods of this invention. It is a cross-sectional top view which shows the excavation process of the obstruction removal construction method using the casing for obstruction removal construction methods of this invention. It is a vertical front view which shows the cutting process with the cutter of the obstruction removal construction method using the casing for obstruction removal construction methods of this invention. It is a cross-sectional top view which shows the process before a cutting | disconnection with the cutter of the obstruction removal construction method using the casing for obstruction removal construction methods of this invention. It is a cross-sectional top view which shows the cutting process with the cutter of the obstruction removal construction method using the casing for obstruction removal construction methods 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.

DESCRIPTION OF SYMBOLS 1 ... Casing 1a ... Casing head 1b ... Main body piece 2 ... Excavation blade 3 ... All-around rotary excavation machine 4 ... Guide rail 5 ... Stopper 6 ... Rail part, earth and sand loosening member 7 ... Hammer grab 8 ... Guide 9 ... Engagement groove DESCRIPTION OF SYMBOLS 10 ... Cutter 10a ... Large arc side 10b ... Small arc side 11 ... Engagement groove 12 ... Blade 13 ... Obstacle 14 ... Exhaust tube 15 ... Opening surface 17 ... Torque stopper 18 ... Counterweight 19 ... Excavation bucket 20 ... Arrow-shaped rod 21 ... Tip 21a ... Inclined surface 22 ... Flange 23 ... Tip 23a ... Back side 23b ... Front side 24 ... Drilling tool

Claims (4)

  A guide rail is attached to the inside of the rotary casing that has an excavating blade at the tip, and the tube for earth removal with the tip that becomes the opening surface cut obliquely at an acute angle along the guide rail can be lowered along the guide rail. An obstruction removing device for removing an obstruction removal method characterized by being provided.   The diameter of the pipe for earth removal should be smaller than the casing diameter−the diameter of the obstacle so that when the obstacle to be removed is taken into the casing, it can be placed in the remaining portion of the casing. The earth removal apparatus of the casing for obstruction removal method of Claim 1 to do.   3. The soil removal apparatus for an obstruction removal method casing according to claim 1 or 2, wherein a barbed bar having a sharp tip can be inserted into the soil removal pipe.   4. A long body having an arrowhead-shaped tip that is flat on the back side and has a sharp tip on the front side is provided as an excavation tool so as to be lowered along the guide rail. Equipment for casing removal for obstruction removal method.

Images