JP2005330690A5 - - Google Patents

Description

Bending correction mechanism for drilling equipment

  The present invention relates to a bending correction mechanism for an excavator.

  In recent years, the drilling depth required for this drilling device tends to be deeper. However, this excavator is often bent or twisted gradually in the excavation process due to the structure of the excavator and due to the reaction force accompanying the variation in the depth direction of the ground strength. If the excavation shaft is excessively tilted or twisted, the improved body will not be as designed. In particular, there will be a large unmodified part between the previous improved body and the next improved body. May occur.

  Therefore, conventionally, using a casing with a drill bit attached to the tip and a donut auger device with an auger screw installed in the casing, the vertical accuracy is improved while counteracting counter torque by rotating the casing and auger screw counterclockwise. An apparatus for excavating the ground is known (see, for example, Patent Document 1).

  However, in the invention described in Patent Document 1, since the auger screw mainly discharges excavated soil and the ground excavation is exclusively performed by the casing, the excavation process is performed when the rigidity is weak and the excavation depth is deep. The curve gradually turned and the vertical accuracy was apt to deteriorate.

On the other hand, although it is related with a boring technique, the single pipe excavation method which correct | amends the bending of a drilling hole is known. This method can correct the direction of excavation when the direction of excavation is deviated in single pipe lateral excavation. As a means for solving the problem, a tip bit with an air hammer for operation is connected to a rod. When the excavation direction deviates from a predetermined direction when rotating the single pipe in the horizontal direction, the tip bit and the rod are pulled out, and then can be brought into contact with the air hammer portion for operating the tip bit. Insert the tip bit and the rod into the correction outer tube with the direction correction guide having the exhaust passage, and fix the air hammer part to the direction correction guide, then insert the correction outer tube into the excavation hole again, and the tip bit The means is to perform correction in a predetermined direction by performing excavation while rotating only the rod (see Patent Document 2).
JP-A-6-81572 (page 3, FIGS. 4 and 5) Japanese Patent Publication No. 2-333830 (2 pages, Fig. 1)

  However, even if the invention described in Patent Document 2 is applied to the earth auger method, it is too laborious to insert the direction correcting guide tube after inserting the rod, and then insert the rod again. . In addition, the direction correction guide is attached at one point to the distal end portion of the outer tube for correction, but when the rod has high rigidity, it is not easy to correct the bending.

  Then, the main subject of this invention is providing the bending correction mechanism of the excavation apparatus which makes a bending correction easy while improving construction efficiency.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
The invention according to claim 1 is provided with a cylindrical casing pipe and a screw auger provided in the casing and having spiral wings, and excavating while rotating the casing pipe and the screw auger in the opposite directions. A bend correcting mechanism for an excavator, wherein the spiral blade of the screw auger has a spiral section with a large blade outer diameter and a spiral section with a small blade outer diameter, and the inside of the casing tube A correction member that abuts the spiral blade of the spiral section having a large blade outer diameter on the peripheral surface and corrects the direction of excavation is symmetrical with respect to the axis of the screw auger and has a predetermined length in the longitudinal direction of the casing tube. Two portions are provided at intervals, and when excavating, a spiral section having a small blade outer diameter is made to face a portion of the casing pipe facing the correction member, and the casing pipe and the screw-off are placed. In the case of bending correction, only the casing pipe is pulled up, the spiral section having a large blade outer diameter is brought into contact with the correction member, and in this state, the casing pipe is A bend correcting mechanism for an excavator, wherein only the screw auger is rotated without being rotated to bend and advance.

(Function and effect)
The spiral blade of the screw auger has a spiral section with a large blade outer diameter and a spiral section with a small blade outer diameter, and abuts the spiral blade of the spiral section with a large blade outer diameter on the inner peripheral surface of the casing tube. Then, the correction member that corrects the digging direction is provided in two locations symmetrically with respect to the axis of the screw auger and at a predetermined interval in the longitudinal direction of the casing tube. The spiral section with a small blade outer diameter is opposed to the portion facing the correction member of the pipe, and the casing pipe and the screw auger can be made to dig while rotating in the reverse direction. Pull up, bring the spiral section with a large blade outer diameter into contact with the correction member, and in that state, rotate the screw auger without turning the casing tube, and bend and advance Door can be. That is, it is easy to switch work between excavation and bending correction, and the construction efficiency is improved.
In addition, the correction angle is set to be larger than that in the case of one position by providing two correction members symmetrically with respect to the axis of the screw auger and at a predetermined interval in the longitudinal direction of the casing tube. In addition, bending correction can be easily performed even if the rigidity of the screw auger is high.

<Invention of Claim 2>
According to a second aspect of the present invention, one of the correction members provided at two locations is configured to be provided at a tip portion of the casing tube. Mechanism.

(Function and effect)
Of the correction members provided at two locations, one of the correction members is provided at the tip of the casing tube, so that the bending can be corrected more easily.

<Invention of Claim 3>
The invention according to claim 3 is the bending correction mechanism for an excavator according to claim 1 or 2, wherein the correction member has a substantially halved cylindrical shape, and both end portions in the longitudinal section direction are tapered.

(Function and effect)
Since the correction member has a substantially half-cylindrical cylindrical shape and both end portions in the longitudinal section direction are tapered, the casing pipe can be pulled up smoothly when correcting the bending.

<Invention of Claim 4>
The invention according to claim 4 includes a cylindrical casing pipe and a rod body provided in the casing and having an excavation head at the tip, while the casing pipe and the rod body are rotated in reverse to each other. A bending correcting mechanism for an excavating apparatus configured to excavate, wherein a first annular member and a second annular member having an outer diameter larger than the outer peripheral surface are provided on the outer peripheral surface of the rod body. A first body which is disposed at a predetermined interval in the longitudinal direction of the body and abuts the first annular member and the second annular member on the inner peripheral surface of the casing tube, respectively, and corrects the direction of digging. The correction member and the second correction member are provided symmetrically with respect to the axis of the rod body and at a predetermined interval in the longitudinal direction of the casing tube. Correction member and second The outer surface of the rod body is opposed to the portion facing the normal member, and the casing pipe and the rod body are dug while rotating in the opposite directions, and when correcting the bending, only the casing pipe is pulled up, The first annular member and the second annular member are brought into contact with the first correction member and the second correction member, respectively, and in this state, only the rod body is rotated without rotating the casing tube. The bending correction mechanism of the excavator is characterized in that it is configured to bend and advance.

(Function and effect)
A first annular member and a second annular member having an outer diameter larger than the outer circumferential surface are arranged on the outer circumferential surface of the rod body at predetermined intervals in the longitudinal direction of the rod body, and the casing tube The first correction member and the second correction member that are in contact with the first annular member and the second annular member, respectively, and correct the direction of digging, are symmetrical with respect to the axial center of the rod body and Since the casing tube is provided at a predetermined interval in the longitudinal direction, the outer periphery of the rod body is placed on the portion of the casing tube facing the first and second correction members when digging. The casing pipe and the rod body can be made to dig while the surfaces are opposed to each other, and at the time of bending correction, only the casing pipe is pulled up, and the first annular member and the second annular member are moved to the first one. Correction member and second Modifying member respectively brought into contact, in that state, without rotating the casing tube, only the rod member is rotated, it is possible to bend excavation. That is, it is easy to switch work between excavation and bending correction, and the construction efficiency is improved.
Further, the first correction member and the second correction member are provided symmetrically with respect to the axis of the rod body and at a predetermined interval in the longitudinal direction of the casing tube, so that the correction angle can be adjusted by the correction member. Can be made larger than the case where only one portion is provided, and even when the rod body has high rigidity, the bending can be easily corrected.

<Invention of Claim 5>
According to a fourth aspect of the present invention, the contact surfaces of the first annular member and the second annular member and the first correction member and the second correction member go downward in the longitudinal section thereof. The bend correcting mechanism for an excavator according to claim 4, wherein the bend correcting mechanism has an inclined shape approaching the axis of the casing tube.

(Function and effect)
If the casing pipe is pulled up within a certain range, the bending angle increases as the casing pipe is pulled up. Therefore, the bending angle can be adjusted by managing the amount of the casing pipe pulled up.

  ADVANTAGE OF THE INVENTION According to this invention, in the bending correction mechanism of an excavation apparatus, while being able to improve construction efficiency, bending correction can be made easy.

Hereinafter, a first embodiment of a bending correcting mechanism of an excavator according to the present invention will be described.
First, the excavator 1 has an overall structure shown in FIG. 1, for example. That is, the reader 3 supported and installed in front of the base machine 2 is structured to be supported by the reader cradle 4 and the backstay 5 of the base machine 2. The reader 3 is provided with a long casing tube 6 formed by connecting a plurality of unit casing tubes in the longitudinal direction so as to be movable in the vertical direction. A power source 7 that slides along 3 is mounted. The power of the power source 7 is transmitted to the casing tube 6 and the screw auger 10 via the speed reducer 8.

  As the power source 7, a hydraulic motor may be used, but generally an electric motor is often used. This type of electric motor is not limited to one, and a plurality of electric motors can be used. The power from these electric motors is gathered together by a gear train (not shown), and the number of rotations is reduced by the speed reducer 8 and transmitted to the casing tube 6. Further, the speed reducer 8 is equipped with a swivel (not shown), and by this swivel, the drilling fluid, air, and roots from the drilling head 10B through a hollow portion (not shown) of the screw auger 10 described later. It is possible to appropriately switch and discharge the hardening liquid or the pile circumference fixing liquid. In addition, below the leader 3, an anti-sway device 9 for guiding the casing tube 6 and preventing the shaking associated with the rotation of the casing tube 6 and the screw auger 10 is attached.

Next, the casing tube 6 and the screw auger 10 will be described with reference to FIGS. 1 and 2. FIG. 2 is a longitudinal sectional view for explaining the unit casing tube and the unit screw auger at the tip portion.
As shown in FIGS. 1 and 2, the casing pipe 6 is configured by connecting a plurality of unit casing pipes in the longitudinal direction. Similarly, the screw auger 10 includes a plurality of unit screw augers connected in the longitudinal direction. It is configured.

  The casing tube 6 (the unit casing tube 6A at the tip portion in FIG. 2) is hollow, and a screw auger 10 (a unit screw auger 10A at the tip portion in FIG. 2) described later is provided therein. Although not shown, spiral wings may be formed on the outer peripheral surface of the casing tube 6. If the spiral wing is formed, the casing tube 6 comes into contact with the excavation hole through the spiral wing, so that the contact area is small, the frictional resistance is reduced, and the excavation performance is improved and the drawing is improved.

  On the inner peripheral surface of the unit casing tube 6A, as will be described later, correction members 61 and 61 that abut the spiral blade 12L of the spiral section LS having a large blade outer diameter and correct the digging direction are provided on the unit screw auger 10A ( Alternatively, two units are provided symmetrically with respect to the axis of the unit casing tube 6A) and at a predetermined interval in the longitudinal direction of the unit casing tube 6A.

  As shown in FIG. 2, the screw auger 10 is formed with an excavation head 10 </ b> B at its tip (a portion protruding from the tip of the unit casing tube 6 </ b> A). Excavation bits 13, 13,... Are attached to the tip of the excavation head 10B. Further, the excavation head 10B is provided with a discharge port (not shown), from which the above-described excavation liquid, air, rooting liquid, pile periphery fixing liquid, or the like can be discharged.

  The outer peripheral surface 11 of the screw auger 10 has a function of discharging the generated excavated soil to the ground from between the screw auger 10 and the inner peripheral surface of the casing tube 6 and excavating bentonite mud water or the like for hole wall stabilization. A spiral blade 12 having a function of stirring the liquid, the root hardening liquid, the pile circumference fixing liquid, or the like is formed. The spiral blade 12 includes a spiral blade 12L in a spiral section LS having a large blade outer diameter and a spiral blade 12S in a spiral section SS having a small blade outer diameter. For example, the blade outer diameter (diameter) is about 520 mm in the section LS and about 500 mm in the section SS.

<Bend correction>
Based on FIG.3 and FIG.4, the relationship between the spiral blades 12L and 12S and the correction members 61 and 61 is demonstrated. FIG. 3 is a longitudinal sectional view for explaining the unit casing tube and the unit screw auger at the distal end portion when bending is corrected, and FIG. 4 is a transverse section for explaining the relationship between the spiral blade and the correcting member. FIG.
The correction members 61, 61 provided on the inner peripheral surface of the casing tube 6A have a substantially halved cylindrical shape, and both end portions thereof are tapered in the cross section. Further, as shown in FIG. 3, both end portions in the longitudinal section direction are tapered so that the casing pipe 6 to be described later can be pulled up smoothly.

  As shown in FIG. 4 (1), the side surface (inner peripheral surface) 61A facing the spiral blade 12 and the spiral blade 12S are not in contact, but as shown in FIG. 4 (2), they are in contact with the spiral blade 12L. It is a form of contact. When the spiral blade 12L contacts the inner peripheral surface 61A, a pressing force is applied in the axial center direction, and the unit screw auger 10A is bent in the axial center direction. Here, as described above, the correction members 61 and 61 for correcting the excavation direction have a symmetrical positional relationship with respect to the axis of the unit screw auger 10A (or the unit casing tube 6A) in the transverse direction. In addition, since the unit casing pipe 6A is provided at a predetermined interval in the longitudinal direction, the correction angle can be increased as compared with the case where the correction member is provided at one place, and the rigidity of the screw auger 10 is increased. Even if the height is high, the bend can be easily corrected. Further, by providing one of the correction members 61, 61 at the tip of the unit casing tube 6A, it is possible to further easily correct the bending.

  At the time of normal excavation (straight excavation), as shown in FIG. 2, by making the spiral blade 12S of the spiral section SS having a small blade outer diameter face the portion facing the correction members 61, 61 of the unit casing pipe 6A, The casing pipe 6 and the screw auger 10 can be dug while rotating in the reverse direction.

  At the time of bending correction, as shown in FIG. 3, only the casing tube 6 is pulled up to a position where the spiral blade 12L contacts the inner peripheral surface 61A, and the spiral blade 12L in the spiral section LS having a large blade outer diameter is corrected member 61. 61, and in this state, only the screw auger 10 can be rotated without turning the casing tube 6 to bend and advance. Here, the adjustment of the bending direction may be performed by rotating the casing tube 6 so that the screw auger 10 bends in an appropriate direction, and then turning only the screw auger 10 to advance the bending. After the bending correction, the casing pipe 6 may be pulled down to the initial position and returned to normal excavation again.

<Other embodiments>
5 and 6 show a second embodiment of the bending correcting mechanism of the excavator according to the present invention. FIG. 5 is a longitudinal sectional view for explaining a unit casing tube and a unit screw auger at the tip portion during excavation in the second embodiment, and FIG. 6 is a diagram in the second embodiment. It is a longitudinal cross-sectional view for demonstrating the unit casing pipe | tube and unit screw auger of the front-end | tip part in the case of bending correction. Moreover, since the whole structure of the excavation apparatus 1 is substantially the same, description is abbreviate | omitted.
In the second embodiment, instead of the screw auger 10 of the first embodiment, a rod body 110 having a drilling head 110B at the tip (unit rod body 110A at the tip in FIG. 5) is used. . Further, since no spiral wing is formed on the outer peripheral surface 111 of the rod body 110, the contact with the first correction member 161 </ b> A and the second correction member 161 </ b> B, which will be described later, is greater than the outer peripheral surface of the rod body 110. The first annular member 112A and the second annular member 112B having a large outer diameter come into contact with each other.

  As will be described later, the inner circumferential surface of the casing pipe 106 (the unit casing pipe 106A at the distal end portion in FIG. 5) abuts on the first annular member 112A and the second annular member 112B, respectively, and corrects the digging direction. The first correction member 161A and the second correction member 161B have a symmetric positional relationship with respect to the axis of the unit rod body 110A (or unit casing tube 106A) and are predetermined in the longitudinal direction of the unit casing tube 106A. Are provided at intervals. The first correction member 161A and the second correction member 161B are substantially half cylinders in which inclined surfaces 161a and 161b that approach the axial center of the casing tube 106 are formed on the inner peripheral surfaces thereof as they go downward. Body shape.

  The first annular member 112 </ b> A and the second annular member 112 </ b> B disposed on the outer circumferential surface of the rod body 110 have a tapered shape that tapers downward as a longitudinal section, and rotates about the axis of the rod body 110. It has a rotating body shape. The tapered inclined surfaces 112a and 112b of the first annular member 112A and the second annular member 112B and the inclined surfaces 161a and 161b of the first correcting member 161A and the second correcting member 161B are in contact with each other, thereby The unit rod body 110A is bent in the axial center direction by applying a pressing force in the central direction. Here, because of the inclined shape of the inclined surfaces 112a and 112b and the inclined surfaces 161a and 161b, in other words, the first annular member 112A and the second annular member 112B, the first correcting member 161A and the second correcting member. When the casing pipe 106 is pulled up by the configuration in which each contact surface with 161B has an inclined shape that approaches the axial center of the casing pipe 106 as it goes downward in the longitudinal section thereof, FIG. 6, the unit rod body 110A moves around the first annular member 112A in a direction away from the inner peripheral surface of the unit casing tube 106A on the first correction member 161A side (in the left direction in FIG. 6). ) And moves in the direction away from the inner peripheral surface of the unit casing tube 106A on the second correction member 161B side around the second annular member 112B. 6 becomes the right direction) as. This is because the bending angle increases as the casing pipe 106 is pulled up within a certain range, and the bending angle can be adjusted by managing the length of the casing pipe 106 being pulled up. Further, the bending angle can be changed by adjusting the inclination angles of the inclined surfaces 112a and 112b and the inclined surfaces 161a and 161b in advance.

  In addition, the presence of the first correction member 161A and the second correction member 161B makes it possible to increase the correction angle and increase the rigidity of the rod body 110 compared to the case where the correction member is provided at one location. However, it is possible to easily correct the bending. Further, by providing the first correction member 161A of the first correction member 161A and the second correction member 161B at the distal end portion of the unit rod body 110A, it is possible to further easily perform the bending correction. As shown in FIGS. 5 and 6, the unit rod body 110A itself is formed by connecting a plurality of rod constituting bodies 110a, 110a,..., And the connections are connected with play by pins or the like. In some cases, the bend correction is further facilitated.

  In this second embodiment, at the time of normal excavation (straight-advance excavation), as shown in FIG. 5, the unit rod is placed on the portion of the unit rod body 110A facing the first correction member 161A and the second correction member 161B. By making the outer peripheral surface 111 of the body face each other, the casing pipe 106 and the rod body 110 can be dug while being rotated in reverse to each other.

  At the time of bending correction, as shown in FIG. 6, the first annular member 112A and the second annular member 112B come into contact with the first correcting member 161A and the second correcting member 161B, and a desired bending angle is obtained. Only the casing pipe 106 is pulled up to a position where the first annular member 112A and the second annular member 112B are brought into contact with the first correction member 161A and the second correction member 161B, respectively. Without rotating the casing tube 106, only the rod body 110 can be rotated to bend and advance. Here, the adjustment of the bending direction may be performed by rotating the casing tube 106 so that the rod body 110 bends in an appropriate direction, and then turning only the rod body 110 to advance the bending. Note that, after correcting the bending, the casing pipe 106 may be pulled down to the initial position and returned to normal excavation again. Since other points are substantially the same as those in the first embodiment, description thereof is omitted.

It is a front view for demonstrating the whole structure of a digging apparatus. It is a longitudinal cross-sectional view for demonstrating the unit casing pipe | tube and unit screw auger of the front-end | tip part in the case of excavation. It is a longitudinal cross-sectional view for demonstrating the unit casing pipe | tube and unit screw auger of the front-end | tip part in the case of bending correction. It is a cross-sectional view for demonstrating the relationship between a spiral blade and a correction member. It is a longitudinal cross-sectional view for demonstrating the unit casing pipe | tube and unit screw auger of the front-end | tip part in the case of excavation in 2nd Embodiment. It is a longitudinal cross-sectional view for demonstrating the unit casing pipe | tube and unit screw auger of the front-end | tip part in the case of bending correction in 2nd Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Excavator, 2 ... Base machine, 3 ... Leader, 4 ... Reader cradle, 5 ... Backstay, 6 ... Casing pipe, 6A ... Unit casing pipe of the front-end | tip part, 7 ... Power source, 8 ... Reduction gear, 9 DESCRIPTION OF SYMBOLS ... Anti-rest apparatus, 10 ... Screw auger, 10A ... Unit screw auger of a front-end | tip part, 10B ... Excavation head, 11 ... Outer peripheral surface, 12 ... Spiral blade, 12L ... Spiral blade of section LS, 12S ... Spiral blade of section SS, DESCRIPTION OF SYMBOLS 13 ... Excavation bit, 61 ... Correction member, 106 ... Casing pipe, 106A ... Unit casing pipe of a front-end | tip part, 110 ... Rod body, 110A ... Unit rod body of a front-end | tip part, 110a ... Rod structure, 111 ... Outer peripheral surface, 112a , 112b ... inclined surface, 161A ... first correction member, 161B ... second correction member, 161a, 161b ... inclined surface, LS ... spiral section with large blade outer diameter, SS ... Small spiral section of the outer diameter.

Claims (5)

A drilling device comprising: a cylindrical casing pipe; and a screw auger having a spiral blade installed in the casing, wherein the casing pipe and the screw auger are excavated while being rotated in reverse to each other. Bend correction mechanism,
The spiral blade of the screw auger has a spiral section with a large blade outer diameter and a spiral section with a small blade outer diameter,
A correction member that abuts the spiral blade of the spiral section having a large blade outer diameter on the inner peripheral surface of the casing tube and corrects the direction of excavation is symmetrical with respect to the axis of the screw auger, and Two places are provided at predetermined intervals in the longitudinal direction,
When digging, the portion facing the correction member of the casing tube is opposed to a spiral section having a small blade outer diameter, and the casing tube and the screw auger are digging while rotating in reverse with each other,
When correcting the bending, only the casing tube is pulled up, the spiral section having a large blade outer diameter is brought into contact with the correction member, and in this state, only the screw auger is rotated without rotating the casing tube. It was configured to rotate and turn and bend,
A bending correction mechanism for an excavator.   The bending correction mechanism for an excavator according to claim 1, wherein one of the correction members provided at two locations is configured to be provided at a distal end portion of the casing tube.   The bending correction mechanism for an excavator according to claim 1 or 2, wherein the correction member has a substantially half-cylindrical cylindrical shape, and both ends in a longitudinal section direction are tapered. A drilling device comprising a cylindrical casing pipe and a rod body provided in the casing and having a drilling head at a tip thereof, wherein the casing pipe and the rod body are excavated while being rotated in reverse to each other. The bending correction mechanism of
On the outer peripheral surface of the rod body, a first annular member and a second annular member having an outer diameter larger than the outer peripheral surface are arranged at predetermined intervals in the longitudinal direction of the rod body,
A first correction member and a second correction member that contact the inner peripheral surface of the casing tube with the first annular member and the second annular member, respectively, and correct the direction of digging are the axial centers of the rod bodies. Symmetric with respect to the longitudinal direction of the casing tube, provided at a predetermined interval,
When digging, the outer peripheral surface of the rod body is opposed to the portion of the casing pipe facing the first correction member and the second correction member, and the casing pipe and the rod body are rotated in the opposite directions. Digging,
At the time of bending correction, only the casing pipe is pulled up, the first annular member and the second annular member are brought into contact with the first correction member and the second correction member, respectively, Without rotating the casing tube, only the rod body was rotated and bent and advanced,
A bending correction mechanism for an excavator.   The contact surfaces of the first annular member and the second annular member with the first correction member and the second correction member approach the axial center of the casing tube as they go downward in each longitudinal section. The bend correcting mechanism for an excavator according to claim 4, which has an inclined shape.