JP3992669B2 - Support tool for underground pipe drill - Google Patents

Description

  The present invention relates to civil engineering equipment, and more particularly to equipment used in drilling work for forming a through hole in a pipe wall of an underground pipe buried in the ground.

  Various pipes such as gas pipes, water and sewage pipes and communication line laying pipes are buried in the ground, and it is necessary to form through holes in the pipe walls of these underground pipes and to connect mounting pipes to them. May occur. Conventionally, when such a need arises, the periphery of a pipe buried in the ground is excavated to expose the pipe wall so that workers can directly touch the pipe wall. Later, through holes were formed in the tube wall with a drilling tool such as a diamond core drill.

However, with such a conventional construction method, it is not possible to form a through-hole in the wall of the pipe unless it is excavated around the underground pipe, and the construction at that time must be large. However, in urban areas where there are many buildings and structures, traffic, and environmental considerations, it is becoming difficult to carry out the work freely.
JP-A-6-65958 None.

  In order to cope with such a situation, a construction method in which the pipe wall can be drilled and connected to the mounting pipe without being dug around the underground pipe is disclosed in Japanese Patent Laid-Open No. 65958 has been proposed.

  Although this method is epoch-making, the drilling of underground underground pipes and the connection of mounting pipes can be carried out very smoothly, but the following problems remain. That is, in this method, prior to drilling the underground pipe and connecting the mounting pipe, the excavation cutter bit is rotated to form an oblique hole from the surface to the underground pipe, and the steel sheath is formed in the oblique hole. Although the pipe was press-fit, it was difficult to make the axis of the oblique hole and the axis of the underground pipe exactly perpendicular to each other.

  As shown in FIG. 1, when the shaft core 2 of the oblique hole 1 and the shaft core 4 of the underground tube 3 are orthogonal to each other, the through-hole 6 is correctly formed in the tube wall 5, but FIG. When the axis 2 of the oblique hole 1 and the axis 4 of the underground tube 3 are shifted without being orthogonal to each other, the formation position of the through hole 6 in the tube wall 5 is also shifted. Therefore, it is obvious that the connection of the attachment pipe to the underground pipe 3 will also be hindered. When the diameter of the through hole 6 to be formed in the underground pipe 3 is sufficiently smaller than the diameter of the underground pipe 3, even if the shaft centers of the two are slightly shifted, there is little problem in practice. As the diameter of the through hole 6 approaches the diameter of the underground pipe 3, the axial centers of both must be more accurately orthogonal. In the figure, reference numeral 21 denotes a steel sheath tube press-fitted into the oblique hole 1.

  The oblique hole 1 is formed by digging from the ground toward the pipe wall 5 of the underground pipe 3 by attaching a drilling cutter bit to the tip of the drill rod and rotating it. Is to measure the burial position of the underground burial pipe 3 accurately and direct the drill rod to it accurately. However, as the excavation cutter bit moves while digging due to soil change or the presence of underground obstacles, etc. A slight shift in the direction of excavation was inevitable.

  Obviously, if the steel sheath tube 21 is press-fitted into the oblique hole 1 in which the position is shifted and drilled along the axial center, a through-hole is formed at an inappropriate position. In the case of a pipe exposed on the ground surface, it is relatively easy to repair the pipe even if such a situation occurs, but in the case of a pipe buried in the ground, the operator's hand is directly Since it did not reach, it was extremely difficult to repair the through hole drilled in this wrong position. Therefore, when the formation of the through hole at the correct position of the underground pipe has failed, the contractor has been charged with the responsibility, and a large burden has been imposed.

  The present inventor has conducted research to solve the above-mentioned serious problems in the formation of through holes in underground pipes, and as a result, the shaft core of the steel sheath pipe press-fitted into the oblique holes and the oblique holes is somewhat. To develop a device that can accurately form through-holes in the pipe wall of underground pipes, even if there is a difference between them, or even if their diameter is large compared to the diameter of underground pipes It has been successful and is proposed here as the present invention.

  The outer cylinder part 11 which supported the drill rod 12 so that it can rotate only in one direction via a one-way clutch mechanism, and three sheets which were planted radially from the outer periphery of this outer cylinder part 11 at equal intervals. The spacer plate mounting piece 13 having a rectangular shape and the spacer plate 14 fixed to the spacer plate mounting piece 13 in a radially adjustable state are used to form a underground pipe drilling drill support. The outer end face 20 of the spacer plate 14 is brought into contact with the inner wall surface of the steel sheath pipe 21 press-fitted into the oblique hole 1 in which the support for the buried pipe drilling drill is advanced toward the underground buried pipe 3, The said subject was solved by making it locate in the steel sheath tube 21. FIG.

  Since the shaft core 24 of the drill rod 12 can be freely changed, even if the steel sheath tube 21 has a larger diameter in comparison with the underground tube 3, or the shaft core of the steel sheath tube 21. Even if it is not perpendicular to the axis 4 of the underground pipe 3, the drill core 12 is adjusted to adjust the axis 24 of the drill rod 12 so that the pipe wall of the underground pipe 3 is accurately drilled. Is possible. Further, since the drill rod 12 is supported by the outer cylinder portion 11 via the one-way clutch mechanism, the outer cylinder portion 11 is swung in a direction opposite to the rotation direction of the drill rod 12 by vibration or torque during the drilling operation. This is prevented, and there is no possibility that the axial center position shifts accordingly.

  The position of the outer cylinder portion 11 that supports the drill rod 12 can be adjusted in the steel sheath tube 21 by the spacer plate 14, and the one-way clutch mechanism is interposed between the outer cylinder portion 11 and the drill rod 12. There are essential features of the invention.

  FIG. 3 is a perspective view of one embodiment of the underground pipe drilling drill support according to the present invention, FIG. 4 is a side view of the support inserted into the steel sheath tube 21, and FIG. 5 is a front view of the same. It is.

  In the figure, reference numeral 11 denotes a metal outer cylinder portion which has a cylindrical shape and supports the drill rod 12 so as to be rotatable only in one direction via a built-in one-way clutch mechanism. And from the outer periphery of this outer cylinder part 11, the metal spacer board attachment piece 13 made into the rectangle is planted radially outward at equal intervals. This spacer plate mounting piece 13 is made of a sufficiently robust material so that it will not be deformed or damaged by vibration or load accompanying rotation of the diamond core drill 22 which will be described later. It is welded firmly.

  On the other hand, reference numeral 14 in the figure denotes a metal spacer plate, which is composed of a base portion 15 fixed to the spacer plate mounting piece 13 and an outer member 16 which is located outside the base portion 15 and which is integrally extended from side to side. The bolts 18 are inserted into the long holes 17 formed in the base portion 15, screwed into the nuts 23, and tightened so that the spacer plate mounting piece 13 can be adjusted in position. It is fixed. Further, a thread groove 19 for attaching a diamond core drill is formed at the tip of the drill rod 12, so that a drilling tool such as a diamond core drill 22 can be attached, and a drive source (not shown) is driven at the rear end. The shaft 25 is connected. Further, the outer end surface 20 of the outer member 16 of the spacer plate 14 is gently bent to facilitate insertion into the steel sheath tube 21.

  This embodiment has the structure as described above, and after adjusting so that the shaft core 24 of the drill rod 12 and the shaft core 4 of the underground tube 3 are orthogonal to each other as shown in FIG. The diamond core drill 22 is inserted into a steel sheath tube 21 press-fitted into the oblique hole 1 formed toward the buried tube 3 and attached to the tip of the drill rod 12 supported on the outer cylinder portion 11 by the drive shaft 25. , The through hole 6 is formed in the tube wall 5 of the underground buried tube 3, but the three spacer plates 14 are positioned outside the outer cylinder portion 11 in an adjustable state. Therefore, the position of the shaft core 24 of the drill rod 12 can be freely changed by adjusting the position of the spacer plate 14. Therefore, if the axis of the steel sheath tube 21 is not perpendicular to the axis 4 of the underground tube 3 for some reason and is displaced, the bolt 18 and the nut 23 are loosened, and the spacer plate mounting piece 13 After adjusting the fixing position of the spacer plate 14 fixed to the shaft, the shaft core 24 of the drill rod 12 is eccentric to coincide with the drilling position of the through hole 6, and then inserted into the steel sheath tube 21, When the drill rod 12 is activated, the through hole 6 is accurately drilled at a predetermined position. FIG. 7 is a front view showing a state in which the shaft core 24 of the drill rod 12 is eccentric in this way.

  Since the drill rod 12 is supported on the outer cylinder portion 11 via a one-way clutch mechanism, the spacer plate 14 is moved in the steel sheath 21 by the vibration and torque accompanying the rotation of the diamond core drill 22. The phenomenon of free-spinning in the direction opposite to the rotation direction does not occur, and the shaft core 24 set by adjusting the spacer plate 14 is stably held, and there is no possibility of shifting during the operation. The adjustment of the axial center position can be performed as many times as necessary during the drilling operation.

  As described above, in the underground buried pipe drilling drill support tool according to the present invention, the shaft core 24 of the drill rod 12 can be freely changed, so that the pipe wall 5 of the underground buried pipe 3 can be placed at a desired position. The through-hole 6 can be formed accurately, and this is particularly effective when trying to form the through-hole 6 having a large diameter that requires a more accurate position.

  It is especially effective when working on underground pipes of relatively small diameter that are buried in urban areas and roads that are difficult to dig up, and can be used for water and sewage construction, gas pipes, communication line laying pipes, etc. It is.

Sectional drawing explaining the formation condition of the through-hole 6 in the state in which the axis 2 of the oblique hole 1 and the axis 4 of the underground pipe 3 are orthogonal. Sectional drawing explaining the formation condition of the through-hole 6 in the state in which the axis 2 of the oblique hole 1 and the axis 4 of the underground pipe 3 are not orthogonally crossed. The perspective view of one Example of the support tool for underground underground pipe drilling drills concerning this invention. Similarly, the side view of the state inserted in the steel sheath tube 21. FIG. Similarly, the front view of the state inserted in the steel sheath tube 21. FIG. Sectional drawing of the state drilled in the pipe wall 5 of the underground pipe | tube 3 using the support tool for underground pipe | tube drilling drills concerning this invention. The front view of the state which made the axis center of the drill rod 12 of the support tool for underground underground pipe drilling drills which concerns on this invention eccentric.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Oblique hole 2 Axle core 3 Underground pipe 4 Axle core 5 Tube wall 6 Through-hole 11 Outer cylinder part 12 Drill rod 13 Spacer plate attachment piece 14 Spacer plate 15 Base 16 Outer member 17 Long hole 18 Bolt 19 Screw groove 20 Outer side End face 21 Steel sheath tube 22 Diamond core drill 23 Nut 24 Shaft core 25 Drive shaft

Claims (1)

The outer cylinder part 11 which supported the drill rod 12 so that it can be rotated only in one direction via a one-way clutch mechanism, and is formed radially outward from the outer periphery of the outer cylinder part 11 at equal intervals radially. The three spacer plate attachment pieces 13 having a rectangular shape and the spacer plate 14 fixed to the spacer plate attachment piece 13 in a radially adjustable state are excavated toward the underground pipe 3. The underground embedment is characterized in that the outer end surface 20 of the spacer plate 14 is brought into contact with the inner wall surface of the steel sheath tube 21 press-fitted into the inclined hole 1 and is inserted into the steel sheath tube 21. Pipe drill drill support.

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