JP2006152745A - Rectangular boring machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rectangular boring machine capable of preventing a run-on phenomenon while enabling an outbreak of a ground lower part. <P>SOLUTION: This rectangular boring machine 1 used for a pipe jacking method, has in a tip part a rectangular excavator 3 for drilling a hole in a rectangular shape by rotation of an excavation part, and a cross-sectional rectangular cylindrical cutting edge 4 for surrounding the outer periphery of the rectangular excavator 3. An excavation part lower part of the rectangular excavator 3 is exposed by retreating the front edge of an outer peripheral lower surface of the cutting edge 4. The rectangular excavator 3 is arranged so that its excavation part can perform the outbreak downward from the outer peripheral lower surface of the cutting edge 4 in a lower part, by excavating in the cutting edge 4 in a top part. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention is used for constructing an underground space in which a horizontal earth retaining cover is constructed while connecting adjacent pipes or steel members with joints in a propulsion method in which pipes or steel materials are inserted by excavating the underground by a non-open cutting method. Regarding the rectangular excavator, in detail, it has a function to prevent the natural ground after excavation with a cutting edge that protects the top, and also prevents the natural ground from loosening and skin peeling, and further digs up the lower part of the ground The present invention relates to a technology that can prevent the above.

  Conventionally, a rectangular excavator equipped with a blade for protecting soil particles from collapsing has a cutter part that is housed inside the blade, and the phenomenon of climbing to the excavated sediment stored below during excavation occurs. There was a problem with quality control. Moreover, although the excavation machine which exposed the excavation part from the blade edge and was able to excavate is proposed by patent document 1, since the upper part is also exposed, depending on soil properties and conditions, it prevents the natural ground from loosening. It was difficult.

  On the other hand, with respect to the tunnel construction method using the conventional receiving method, pipe roof method, horizontal earth retaining method, etc., the buried pipe to be constructed in advance generally has a joint. Therefore, it has been necessary to push or pull the tube having the joint and insert it into a predetermined position. In that case, penetration resistance increases when the joint is inserted into the ground, deformation, breakage, and dropout of the joint occur, and smooth insertion is not performed. There were cases where problems occurred in terms of construction period, quality, and economy.

Therefore, an excavating machine disclosed in Patent Document 2 has been proposed as a technique for smoothly inserting a joint. This technique is a structure that is installed in the middle part of a buried pipe or inside one side of a rectangle, and is not a structure that can be installed in the outermost peripheral part, and the joint position is limited.
JP 2000-257385 A Japanese Patent No. 3568844

  The problem to be solved by the present invention is to provide a rectangular excavator capable of solving these conventional problems and enabling the excavation of the lower part of the ground and preventing the climbing phenomenon. The second problem is that even when adjacent pipes or steel joints are installed on the outermost periphery, grooved excavation is possible to reduce penetration resistance of the joints, and deformation, breakage, and dropout of the joints can be prevented. The purpose of this is to enable smooth and efficient insertion of the joint.

The configuration of the present invention that solves this problem is as follows.
1) In a rectangular excavator used in a propulsion method including a rectangular excavator drilling into a rectangular shape by rotation of an excavating unit and a cylindrical cutting edge having a rectangular cross section surrounding the outer periphery of the rectangular excavator at the tip, The front edge of the outer peripheral lower surface of the blade edge is retracted to expose the lower part of the rectangular excavator, and the lower part of the rectangular excavator is excavated inside the blade at the top and below the lower peripheral surface of the blade at the lower part. Rectangle excavator characterized in that the excavation depth can be adjusted and the depth of the excavation can be adjusted 2) The position of the excavation part of the rectangular excavator and the center of the outline of the rectangular excavator are shifted up and down. The rectangular excavation machine according to 1), wherein the lower excavation depth can be adjusted, and the cutting edge side of the blade edge is formed so as to be obliquely rearward from above to below. Rectangular machine 4) Retract part of the leading edge of the blade edge 3) The rectangular excavator 5) described in 3), wherein the cutting edge is provided with a bit toward the outer peripheral direction, and the whole cutting edge is made detachable as a unit according to the soil. Or, the rectangular excavator described in 4) 6) The rectangular excavator described in any one of 1) to 5) above, wherein a rotary excavator for cutting a groove in the propulsion direction is attached to the outer shell of the rectangular excavator 7) The rotary excavator of the outer shell There is a pouring means for pouring out additive material to reduce ground resistance in front of the equipment, and earth removing means for discharging the soil of the mixture of ground and additive material excavated behind it to prevent consolidation. It exists in the rectangular excavation machine of the said 6) provided.

  In accordance with the present invention, the rectangular excavator at the tip is arranged so that the excavating portion is exposed downward from the outer peripheral lower surface of the blade edge, so that the excavation of the lower portion can be performed while preventing the collapse of the top portion. The ride can be reduced. In addition, by cutting a groove for a joint into a hole drilled by a rectangular excavator, a pipe or steel material having a joint on the outermost peripheral portion can be inserted without resistance, and the joint can be prevented from being deformed or damaged smoothly. Can be promoted.

  As the means for adjusting the surplus digging depth of the present invention, a method of adjusting and rotating the bit of the excavation part of the rectangular excavator so as to excavate, or the excavation part itself above and below the center of the outline of the rectangular excavator. There is a method of decentering by shifting the position. The blade has a hood that protrudes forward from the top, and its cutting edge is uneven to reduce penetration resistance, and it is integrated and detachable so that it can be exchanged according to the soil. It is also easy to replace. The cutting edge is partially retracted to reduce penetration resistance and generate concentrated stress to facilitate penetration during contact. The rotary excavator attached to the outer shell has various shapes such as a disk shape, a diamond shape, and a cross shape with a carbide tip etc. at the tip, and is used by opposingly arranged vertically and horizontally depending on the position of the joint. . Embodiments of the present invention will be specifically described below with reference to the drawings.

  1 is a longitudinal sectional view of a rectangular excavator of the embodiment, FIG. 2 is a perspective view of the rectangular excavator of the embodiment, FIG. 3 is a longitudinal sectional view of the rectangular excavator of the embodiment, and FIG. 4 is a longitudinal section of the outer shell of the embodiment. FIG. 5 is an explanatory view showing the cutting of the groove of the embodiment.

  As shown in FIGS. 1 to 4, the rectangular excavator 1 according to the present embodiment has a rectangular cross section in which corner portions are connected to each other at the rear end portion of the outer shell 2 of the rectangular excavator 3 by joints 10 and arranged in the horizontal direction. The tubular body 9 is connected, and the end of the tubular body 9 is pressed at the starting base, and the tubular body 9 is buried in the ground while being drilled by the rectangular excavator 3. On the side surface of the outer shell 2 of the rectangular excavator 3, a pair of flat plate-like rotary cutters 8 are axially supported so that the front and rear positions are shifted in the vertical and horizontal directions and the cutting edge protrudes from the outer shell 2.

  At the tip of the rectangular excavator 3, a hood-like cutting edge 4 having an upper surface protruding forward and a side edge formed obliquely rearward is detachably attached with bolts 4a. The structure is capable of drilling in a rectangular shape by movement, and the center position of the drive portion is deviated by 35 mm downward from the center of the outer shell 2. At the front position of the outer shell 2 of the rotary cutter 8, there are formed a spout 2a for pouring the additive material for reducing excavation resistance into the hole H, and a discharge port 2b for collecting the excavated sediment Ga and additive material. 5a is a motor, 6 is a discharge port, 6a is a discharge pressure regulating valve, 7 is a mud storage tank, 7a is a suction discharge pipe, 8b is a motor, 9 is a tube, 10 is a joint, and G is the ground In addition, earth and sand, Ga is excavated earth and sand, H is a drilling hole, S is a groove, and T is a tunnel.

  In the present embodiment, a propulsion device (not shown) using a jack is installed at the starting base of the tunnel T, and the rectangular excavator 1 is horizontally arranged, and then the rectangular excavator 1 is directed toward the upper ground (crown portion) of the tunnel T. The excavator 3 and the rotary cutter 8 are actuated and propelled by a propulsion device to dig into a rectangular shape. As shown in FIG. 3, the upper portion of the rectangular excavating device 3 prevents collapse by the blade edge 4, and the lower portion is excavated by an eccentric amount to suppress the accumulation of excavated earth and sand Ga, thereby preventing the climbing.

  As shown in FIG. 5A, in the rotary cutter 8, a groove S having a depth of 50 to 150 mm along the propulsion direction of the tube body 9 is excavated in the upper, lower, left and right corners of the hole H. The joints 10 attached to the top, bottom, left and right of the pipe body 9 by this groove S greatly reduce the resistance from the ground and the earth and sand G accompanying the movement, and the pipe bodies 9 are connected to each other by the joint 10 as shown in FIG. It can be easily propelled in the locked state. At the same time, the additive material is poured out from the spout 2a toward the rotary cutter 8, making the rotary cutter 8 excavated effectively. The excavated sediment Ga, rock fragments, additives, water, etc. cut by the rotary cutter-8 are scraped and discharged from the soil discharge port 2b and sucked by an external mud suction / sludge device (not shown). Discharged.

  The rectangular propulsion machine of the present invention is embedded in tunnels, such as earth retaining cover and protective work, box-shaped drilling holes, underground piping work, prevention of ground collapse, etc. Used in construction work.

It is a longitudinal cross-sectional view of the rectangular propulsion machine of an Example. It is a perspective view of the rectangular excavation apparatus of an Example. It is a longitudinal cross-sectional view of the rectangular excavation apparatus of an Example. It is a longitudinal cross-sectional view of the outline of an Example. It is explanatory drawing which shows the cutting of the groove | channel of an Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rectangular propulsion machine 2 Outer shell 2a Spout 2b Soil discharge port 3 Rectangular excavation device 4 Cutting edge 4a Bolt 5 Bit 5a Motor 6 Soil discharge port 6a Soil pressure adjusting valve 7 Mud storage tank 7a Suction discharge pipe 8 Rotating cutter
9 Tubing body 10 Joint G Ground and earth and sand Ga Drilling earth and sand S Drilling hole T Tunnel

Claims (7)

  In the rectangular excavator used for the propulsion method having a rectangular excavator drilling into a rectangular shape by the rotation of the excavator and a cylindrical blade having a rectangular cross section surrounding the outer periphery of the rectangular excavator at the tip, the blade The front edge of the outer peripheral lower surface of the rectangular excavator is retracted to expose the lower portion of the rectangular excavator, and the rectangular excavator excavates the inside of the blade edge at the top and the lower portion of the lower surface from the outer peripheral lower surface of the blade edge. A rectangular excavator that is arranged so that it can be dug and the depth of the extra dug is adjustable.   The rectangular excavator according to claim 1, wherein the excavation part of the rectangular excavator and the center of the outline of the rectangular excavator are shifted up and down to adjust the lower excavation depth.   The rectangular engraving machine according to claim 1 or 2, wherein the blade edge side of the blade edge is formed so as to be obliquely rearward from above to below.   The rectangular engraving machine according to claim 3, wherein a part of the leading edge of the blade edge of the blade edge is retracted to form an uneven shape.   The rectangular excavation machine according to claim 3 or 4, wherein the cutting edge has a structure in which a bit is attached toward the outer peripheral direction, and the whole cutting edge is integrally removable according to the soil quality.   The rectangular excavator according to any one of claims 1 to 5, wherein a rotary excavator that cuts a groove in a propulsion direction into the ground is attached to an outer shell of the rectangular excavator.   A pouring means for pouring out additive material to reduce ground resistance is provided in front of the rotary excavator of the outer shell, and the earth and sand of the mixture of ground and additive material excavated behind it is discharged to prevent consolidation. The rectangular excavator according to claim 6, further comprising a soil removal means.

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