JP4716410B2 - Method for removing and collecting double pipe drilling apparatus and apparatus for removing and collecting double pipe drilling apparatus used in the method - Google Patents

Description

  The present invention relates to a removal and collection technique for a double-pipe drilling device in which an outer bit is disposed on an outer peripheral portion of an inner bit. More specifically, after the intended excavation work is completed and the inner member such as the inner bit and inner rod is taken out from the hole, the outer member such as the outer bit and outer pipe remaining in the hole is easily removed from the hole. The present invention relates to an improved technique for enabling removal and collection.

In this type of double-pipe drilling apparatus, after the intended excavation work is completed, the used drilling apparatus is generally removed from the drilling hole and collected. As a technical means for removing the outer member such as the outer tube from the hole, the outer member such as the outer bit and the outer tube remaining in the hole after the inner member such as the inner bit and the inner rod is taken out from the hole. A method is known in which a protective tube is inserted inside the hole to prevent the inner wall of the drilling hole from collapsing, and the outer member is removed from the drilled hole and collected (Patent Document 1).
Japanese Patent No. 3455178 (paragraph 0026)

  By the way, this kind of double-pipe drilling apparatus is used for various applications with a relatively large bore diameter of about 120 mm or more. In the case of this large diameter, since the dimensions of the outer member such as the outer tube are relatively large, there is a space in the removal and recovery work from the hole of the outer member such as the outer tube. In the case of small bores with a diameter of about 90 mm or less, which is generally used in slope stabilization construction using anchor materials such as, anchor materials such as lock bolts, especially anchors with externally fitted spacers Due to the relationship between the installation of materials and the like, there was little space left, and it was not easy to pull out the outer member from the hole.

  The present invention has been researched and developed in view of the above-described conventional technical situation. After the intended excavation work is completed and the inner member such as the inner bit and the inner rod is taken out from the hole, It is an object of the present invention to provide a removal and collection technique for a double-pipe drilling device that can easily remove and collect outer members such as an outer bit and an outer pipe from the drilling hole.

  In the present invention, in order to solve the above-described problem, after the excavation by the double pipe drilling device in which the outer bit is disposed on the outer peripheral portion of the inner bit is finished, the inner member is taken out from the drilled hole and then remains in the drilled hole. A protective tube is inserted inside the outer member to be removed, and the outer member is taken out from the drilling hole in a state where the protective tube is pressed downward by applying fluid pressure to the upper surface of the closed portion that closes the opening of the protective tube. The technical means of removing and collecting was adopted. For example, air can be used as the fluid that applies pressure to the upper surface of the closed portion. Further, the outer diameter of the blocking member is set to be larger than the outer diameter of the protective tube, and a flange portion extending to the gap between the protective tube and the outer member is formed in the peripheral portion of the blocking member. Good.

According to the present invention, the following effects can be obtained.
(1) Technical means for removing and collecting an outer member such as an outer tube from a drilled hole in a state where fluid pressure is applied to the upper surface of the closed portion where the opening of the protective tube is closed and the protective tube is pressed downward. Therefore, when pulling out the outer member from the drilling hole, the trouble that the protective tube goes up together due to friction with the outer member or biting of earth and sand is surely eliminated. Smooth removal and collection is possible.
(2) If it is applied to small-diameter drilling where there is little space on the inside and removal and collection of the outer member such as the outer tube is difficult, removal and collection of the outer member is greatly facilitated. It is effective.
(3) Since the double-pipe drilling device can be removed and recovered at an early stage by using a protective tube, and moved to the next drilling position for diversion, the device can be used efficiently. Furthermore, workability can be improved because a grout material can be injected into the protective tube of each drilling hole collectively.
(4) If a flange extending in the gap between the protective tube and the outer member is formed in the peripheral portion of the blocking member, it acts by the fluid flowing between the protective tube and the outer member. Since the side pressure with respect to the protective tube can be reduced or eliminated, deformation of the side surface of the protective tube can be avoided, and thus the thickness of the protective tube can be reduced.

  The present invention can be widely applied if a double pipe drilling device in which an outer bit is disposed on the outer peripheral portion of the inner bit is used. For example, a rotary blow type double pipe drilling device that applies impact force from a down-the-hole hammer or top hammer to the inner bit, transmits the impact force to the outer bit side, and further excavates while applying rotational force. However, the present invention can be applied to other types of double pipe drilling apparatuses. Further, as described above, the application to the case of a small diameter is extremely effective, but it is needless to say that the application is also possible to a case of a medium and large diameter. As the protective tube, a plastic pipe or the like having a certain degree of flexibility is suitable, but a metal tube may be used. The closing member that closes the opening of the protective tube has a form that closes only the opening of the protective tube, and a flange that extends to the gap between the protective tube and the outer member is formed in the periphery. Forms are possible. In the case of the latter form, the fluid for pressing the protective tube flowing into the gap between the protective tube and the outer member can be reduced or prevented, so that the side pressure acting on the side surface of the outer member can be reduced or eliminated. it can. Therefore, in the case of this form, the thickness of the protective tube can be reduced as described above. Incidentally, the closing portion for closing the opening of the protective tube may be formed integrally with the protective tube without using the closing member. Regarding how to apply the fluid pressure to the protective tube, for example, when the outer member such as the outer tube is pulled out in stages, the fluid pressure is intermittently applied according to the pulling operation. Alternatively, it may be configured to continuously apply the fluid pressure continuously.

  By the way, in the natural slope stabilization method that stabilizes the slope while leaving the natural state that is increasing recently as much as possible, the drilling device has to be moved to each drilling position on the natural slope with many holes. Accordingly, a relatively small and lightweight drilling device having a drilling diameter of about 90 mm or less is used. However, as described above, the removal and recovery technology of the double pipe drilling device according to the present invention is a double hole for a small bore. It can also be applied to a pipe drilling device, and if applied to this natural slope stabilization method, the drilling device can be easily used for the next drilling operation, and can be diverted at an early stage. Can be used efficiently, and workability can be greatly improved with a small number of drilling devices.

As described above, the removal and recovery technology from the drilling of the double pipe drilling apparatus according to the present invention uses a double pipe drilling apparatus in which an outer bit is disposed on the outer peripheral portion of the inner bit. It can be widely applied. In this embodiment, a case where an anchor material such as a lock bolt is installed using an appropriate double pipe drilling device will be described. Therefore, in this case, a hole for installing the anchor material is formed at a predetermined position by a well-known excavation action by the inner bit and the outer bit. When the hole is formed, the removal and collection work of the double pipe drilling device and the installation work of the anchor material are performed according to the following procedure.
(1) Take out an inner member such as an inner bit or inner rod from the hole.
(2) A protective tube is inserted inside an outer member such as an outer bit or an outer tube.
(3) The outer member is taken out from the drilling hole using the ground body. At this time, the protective tube is pressed by fluid pressure. Incidentally, at this time, the double-pipe drilling device comprising the drilling device main body and the inner member and outer member can be moved to the next drilling position and used.
(4) Inject grout material into the protective tube.
(5) Insert an anchor material such as a lock bolt into the protective tube. The order of (4) and (5) may be reversed.
(6) The protective tube is manually removed from the hole.
(7) Supplement the grout settlement.

  FIG. 1 is a work explanatory view showing a main part in a work of removing and collecting an outer member such as an outer tube from a hole to which the present invention is applied. In addition, this FIG. 1 shows the working state of the said procedure (3) after taking out inner members, such as an inner bit and an inner rod, from a drilling hole and inserting a protective tube. In the figure, reference numeral 1 denotes a ground body of a double pipe drilling device, which applies a rotational force to an inner bit or an outer bit during excavation operation, or an impact force in the case of a top hammer method. Also, air or water is supplied to the tip of the inner bit through the inner passage of the inner rod. In the figure, reference numeral 2 denotes an outer tube, and an outer bit 4 provided with a tip 3 is connected to the tip of the outer tube so that it can only slide in the axial direction. That is, in this embodiment, the outer tube 2 and the outer bit 4 constitute an outer member, and the outer body 2 and the outer bit 2 are moved by raising the ground body 1 with the upper end of the outer tube 2 connected as shown in the figure. The bit 4 is pulled up and taken out from the hole 5. The outer tube 2 is in a state where the required number is connected in accordance with the depth of the hole 5.

  Next, the characteristic part of the present invention will be described. As shown in FIG. 1, in the working state of the procedure (3), the protective tube 6 has already been inserted inside the outer member composed of the outer tube 2 and the outer bit 4. Further, a hooked closing member 7 is attached to the upper end portion of the protective tube 6. As shown in FIG. 2, the protective tube 6 is composed of a hollow tube such as a plastic pipe. In the procedure (2), when the protective tube 6 is inserted into the outer member, the ground body 1 is raised in a state where the outer tube 2 is not connected, and the ground body 1 and the outer tube 2 are connected. The protective tube 6 is inserted into the outer tube 2 while bending the protective tube 6 so as not to interfere with the ground main body 1 from between the upper end portions, or the protective tube 6 is moved from the upper side of the outer tube 2 by shifting the ground main body 1 sideways. It is possible to insert. Further, as shown in FIG. 3, the closing member 7 is formed of an integrally molded body such as plastic made of a disk portion 8 and a cylindrical portion 9. The cylindrical portion 9 is formed to be insertable at the end of the protective tube 6, and the disk portion 8 is formed to have an outer diameter larger than that of the protective tube 6, and a gap between the protective tube 6 and the outer tube 2 is formed by the peripheral portion thereof. A collar portion extending to the portion is formed.

  Thus, in the above procedure (3), when the outer member composed of the outer tube 2 and the outer bit 4 is taken out from the hole 5 and recovered, the upper end portion of the outer tube 2 as shown in FIG. Are connected to the ground main body 1 side, and an appropriate fluid such as compressed air is supplied from the ground main body 1 to the disk portion 8 of the closing member 7 through the internal space of the outer tube 2 to act on the fluid pressure, In a state where the protective tube 6 is pressed downward, the ground body 1 is raised and the outer tube 2 and the outer bit 4 are pulled up from the hole 5. Thus, in the removal and recovery technique according to the present invention, the protective tube 6 includes the outer tube 2 and the outer bit 4 in a state where the protective tube 6 is pressed downward by the fluid pressure acting on the closing member 7 attached to the upper end portion thereof. Since the outer member is pulled up from the hole 5, the trouble that the protective tube 6 is lifted together when the outer member is pulled up is accurately eliminated. Therefore, especially when applied to the case of a small-diameter double pipe drilling device in which it is difficult to make a sufficient gap for edging between the outer member and the protective tube, the protective tube 6 does not rise together. Since outer members such as the outer tube 2 and the outer bit 4 can be removed and collected easily and smoothly, it is extremely effective.

It is operation | work explanatory drawing which showed the principal part in the removal collection | recovery operation | work from the hole drilling of the outer member to which this invention is applied. It is the expanded longitudinal cross-sectional view which showed the protective tube. It is the expanded longitudinal cross-sectional view which showed the obstruction | occlusion member.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Ground main body of double pipe drilling apparatus, 2 ... Outer pipe, 3 ... Tip, 4 ... Outer bit, 5 ... Drilling hole, 6 ... Protection pipe, 7 ... Closure member, 8 ... Disc part, 9 ... Cylindrical Part

Claims (4)

  After excavation by the double-pipe drilling device in which the outer bit is disposed on the outer peripheral portion of the inner bit, the inner member is taken out from the drilled hole, and then the protective tube is inserted inside the outer member remaining in the drilled hole. And a double-pipe drilling device, wherein the outer member is taken out from the drilled hole while fluid pressure is applied to the upper surface of the closed portion where the opening of the protective tube is closed to press the protective tube downward. Removal collection method.   The method for removing and collecting a double-pipe drilling device according to claim 1, wherein air is used as a fluid that applies pressure to the upper surface of the closed portion.   A protective tube having an outer diameter that can be inserted inside the outer member, and a closing member that closes the opening of the protective tube. After the inner member is taken out from the hole, the outer member remaining in the hole is removed. The protective tube is inserted inside, and the outer member is removed from the hole in a state in which fluid pressure is applied to the upper surface of the closed portion in which the opening of the protective tube is closed by the closing member. This is a double pipe drilling device removal and recovery device. The outer diameter of the blocking member is set to be larger than the outer diameter of the protective tube, and the flange portion extending to the gap between the protective tube and the outer member is formed in the periphery of the blocking member. The removal recovery apparatus of the double pipe | tube drilling apparatus of Claim 3 characterized by the above-mentioned.

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