JP2505595Y2 - Ground drill drill guide device - Google Patents

Description

[Detailed Description of the Invention] << Industrial Application Field >> The present invention relates to a guide device for a hole drill used when excavating a vertical hole for installing a pile, a permanent anchor or the like in the ground.

<Prior art> When installing piles or permanent anchors, use a ground drilling hole such as an earth auger to drill a hole perpendicular to the ground. In a general situation, a hole drill is held vertically by a mast of a heavy machine to carry out hole drilling. In this case, it is easy to excavate a hole perpendicular to the ground.

However, when excavating a vertical anchor hole in the lower part of an existing building, the excavation start point (the bottom of the building structure)
May be deeper than the ground surface, in which case a guide pipe is installed so as to penetrate vertically through the building, and a drill is drilled through the guide pipe from the ground side to drill a hole from the bottom of the building.

<Problems to be solved by the invention> When a vertical drilling hole is drilled through a guide pipe from a lower part of an existing building to a vertical underground anchor hole, etc. as described above, it is necessary to install the guide pipe itself vertically. It is difficult, and therefore, it is not possible to excavate while keeping the hole drill in a vertical position, and it is often impossible to excavate a correct vertical anchor hole.

This invention has been made in view of the above-mentioned conventional problems, and its purpose is to provide a device for guiding a ground drilling hole with a guide pipe, and the verticality when installing it in an existing building is not so accurate. Even so, it is to provide a configuration in which the drill can be correctly guided vertically by simple correction and adjustment work.

<< Means for Solving the Problems >> Therefore, in this invention, a large-diameter outer pipe is arranged substantially vertically, and a small-diameter inner pipe is inserted into the outer pipe, and a joint portion is provided at the lower ends of both pipes. The two pipes are connected to each other with the center of the lower end of the outer pipe aligned with the center of the lower end of the inner pipe, and the inner pipe can be tilted in the outer pipe with the connecting portion serving as a fulcrum.

<< Operation >> The outer pipe is fixedly installed to the structure of the existing building, and the ground drilling hole is passed through the inner pipe. Even if the outer pipe is installed at a certain angle with respect to the vertical, the inner pipe can be corrected to a vertical posture by appropriately tilting the inner pipe with respect to the outer pipe with the joint portion as a fulcrum. it can.

<< Embodiment >> FIG. 1 shows a state in which a guide device according to a first embodiment of the present invention is installed on the site. 1 is the ground and 2 is the underground structure of the existing building.

Reference numeral 3 denotes an outer pipe of the guide device according to the present invention, which is provided with a hole in the underground structure 2 and the outer pipe 3 is fixedly installed in a substantially vertical state. At this time, it is not easy to install the outer pipe 3 completely vertically as described in the prior art example, and it is easy to install the outer pipe 3 with a slight inclination as shown in FIG.

Reference numeral 4 denotes an inner pipe having a diameter smaller than that of the outer pipe 3, and the inner pipe 4 is inserted into the outer pipe 3 and the center of the lower end portion of the inner pipe 4 is centered on the lower end portion of the outer pipe 3 by a joint portion 5 provided at the lower end portions of both pipes 3 and 4. Both pipes are connected so that they match. The inner pipe 4 can be tilted in the outer pipe 3 as indicated by arrows A and B with the joint portion (joint portion 5) as a fulcrum. After the inner pipe 4 is installed in the outer pipe 3, the upper end side of the inner pipe 4 is displaced around the joint portion 5 to bring the inner pipe 4 into a correct vertical state. When the adjustment is completed, the inner pipe 4 is fixed to the outer pipe 3 or the structure 2 by an appropriate means. In this way, a hole drill is passed through the inner pipe 4 which is installed completely vertically, and the ground 1 below both pipes 3 and 4 is excavated by the drill 6 to form vertical anchor holes and the like.

The joint portion 5 in the embodiment of FIG. 1 is provided with an outer flange 3a that is continuously provided inside the lower end of the outer pipe 3 and a joint pipe 3b that rises upward from the inner circumference of the outer flange. 4a is continuously provided on the outer periphery near the lower end of the pipe, and a joint pipe 4b that descends from the outer periphery of the flange 4a is provided. The joint pipe 3b on the outer pipe 3 side is the joint pipe on the inner pipe 4 side.
It is fitted into the inner circumference of 4b.

FIG. 2 shows another embodiment of the joint portion 5. In this example, a flange 4a and a joint pipe 4b are provided on the inner peripheral side of the inner pipe 4, and the joint pipe 3b of the outer pipe 3 is fitted between the inner pipe 4 and the joint pipe 4b.

FIG. 3 shows a third embodiment of the joint portion 5. Here, nothing is provided on the lower end side of the inner pipe 4 to form a straight pipe, which is passed through the joint pipe 4b of the outer pipe 3. . In this embodiment, the inner pipe 4 can be moved vertically as well.

<Effect of device> As described in detail above, in the ground drill drill guide device according to the present invention, even if the outer pipe installed by making a hole in the underground structure of the existing building is not completely vertical. Since the angle of the inner pipe inserted in the outer pipe can be adjusted in the outer pipe, the inner pipe through which the hole-drilling drill is passed can be brought into a completely vertical state by a simple adjustment work,
Holes for installing piles, permanent anchors, etc. can be correctly and vertically excavated under the underground structure.

[Brief description of drawings]

FIG. 1 is a block diagram showing a state in which a guide device according to an embodiment of the present invention is installed on site, and FIGS. 2 and 3 show a second joint portion.
It is a principal part block diagram which shows Example and 3rd Example. 1 ... Ground, 2 ... Underground structure 3 ... Outer pipe, 3a ... Bottom flange 3b ... Joint pipe, 4 ... Inner pipe 4a ... Flange, 4b ... Joint pipe 5 ... Joint portion, 6 ... Drill hole Drill

Claims (1)

(57) [Scope of utility model registration request] 1. A large-diameter outer pipe is disposed substantially vertically, a small-diameter inner pipe is inserted into the outer pipe, and a joint portion provided at the lower end portions of both pipes is provided at the center of the outer pipe lower end portions. The two pipes are connected in a state where the centers of the lower ends of the inner pipes are aligned with each other, and the inner pipe is configured to be tiltable in the outer pipe with the connecting portion serving as a fulcrum. Guidance device.