JP2566905Y2 - Fluid injection perforator - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid injection perforation apparatus for boring a ground and injecting a ground hardener.

[0002]

2. Description of the Related Art (Prior Art) In a conventional fluid injection drilling device, a motor, a clutch, a speed reducer, and a rod support arm are mounted on a base frame installed on a construction ground, and a cutter is provided at the tip of the rod support arm. Are supported. The rod is propelled into the ground under the ground while rotating by a feed mechanism provided on the rod support arm.

[0003] When boring on the construction ground,
When the base frame is installed at the construction point, a desired cutter is attached to the tip of the rod, the prime mover is started, and the reducer is connected by the clutch, and the rod rotates. When the rod is propelled by the feed mechanism after the rotation of the rod, boring of the ground is performed.

[0004]

However, in such a fluid injection drilling device, the diameter of the cutter is set to be larger than the diameter of the rod in order to reduce the friction between the rod and the ground. Therefore, if a soil hardening agent or the like is injected into the bore hole after boring, there is a problem that the soil hardener does not sufficiently penetrate into the ground by flowing out of the gap between the rod and the bore hole.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a fluid injection and piercing device according to the present invention is provided so that a rod has a cylindrical portion through which the rod is inserted and a projecting portion provided on a cutter side of the cylindrical portion. A sealing member having a flange portion is rotatably mounted in the direction around the axis of the rod, and an elastic body is formed on the cutter-side surface of the flange so as to be tightly sealed to an opening peripheral portion of a drilling hole opened by the cutter. The cylindrical portion is provided with fixing means for adjusting the axial position of the rod.

[0006]

According to the fluid injection perforation apparatus of the present invention, when the cylindrical portion is fixed to the rod and the rod is pressed in the depth direction of the boring hole, the elastic body is compressed by the flange to tighten the rod, and the boring is performed. There is no gap between the peripheral edge of the hole and the elastic body, the borehole is sealed, and the fluid permeates into the ground around the borehole.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a fluid injection perforating apparatus according to an embodiment of the present invention;

FIGS. 1 and 2 show an embodiment of the present invention. In the figure, reference numeral 1 denotes a ground, 2 denotes a shaft, 3 denotes a steel sheet pile, and 4 denotes a boring machine as a fluid injection drilling device.

The boring machine 4 has a base 5 provided to face the steel sheet pile 3. The base 5 has a rectangular flat plate shape extending horizontally so that the position in the horizontal direction can be adjusted.Abrasion-resistant steel guide rails 6, 6 are provided at the upper and lower ends of the base 5. Have been. The guide rails 6 are connected by a flat plate 7. The flat plate 7 is made of a light material, for example, a light alloy such as aluminum or nickel, but may be made of steel if rigidity is required. Note that a lightening hole (not shown) may be provided in the flat plate 7 to reduce the weight. Thick portions 7a are provided at both ends on one surface side of the flat plate 7, and a mounting plate 8 is attached to the thick portions 7a. At the upper and lower ends of the mounting plate 8, magnet fixing means 9 is provided.

The magnet fixing means 9 has a magnet portion 10 which is attracted to the steel sheet pile 3 by magnetic force. The magnet unit 10 uses an electromagnet so that the disk-shaped magnet unit 10 can be easily attached to and detached from the steel sheet pile 3, but may be a permanent magnet. On the opposite side of the magnet unit 10 from the attraction surface, a universal joint 11 is provided in which the concave spherical surface and the convex spherical surface are in sliding contact. The universal joint 11 is mounted on the mounting plate 8 by bolts 12. Thus, even if the steel sheet pile 3 around the shaft 2 opened in the ground 1 is angled, the surface of the magnet section 10 is
Adhere to 3. In the case where two magnet parts 10 are provided, one each at both ends in the longitudinal direction of the flat plate 7, the universal joint 11 is not necessarily required.

A bolt hole (not shown) is provided in the thick portion 7a. The flat plate 7 of the base 5 is provided with a large number of counterbore holes 13 corresponding to the bolt holes. The counterbore hole 13 is formed at a depth such that the head of a bolt screwed into the thick portion 7a does not protrude from the surface of the flat plate 7. The mounting position of the mounting plate 8 can be adjusted in the longitudinal direction of the base 5 by selecting the counterbore hole 13, so that the mounting interval and mounting surface position of the magnet unit 10 in the longitudinal direction can be selected. In addition, magnet fixing means
9 is neither limited to four magnet parts 10 nor limited to two magnet parts 10 connected by the mounting plate 8,
Of course, they may be attached to the base 5 independently of each other.

On the other side of the base 5, a movable base 14 for holding the upper and lower guide rails 11, 11 is provided slidably with respect to the base 5. The moving base 14 has a fixed handle for fixing the moving base 14 at an arbitrary position on the base 5.
15 and an upright plate 16 that stands upright on the base 5. The screw portion of the fixed handle 15 is screwed into the moving base 14, and the fixed handle 15 is rotated to move and fix the moving base 14 by contacting and separating the tip of the screw portion with the upper guide rail 11. Perform

The upright plate 16 of the movable base 14 has
A tilting plate 17 that stands upright in the orthogonal direction is attached to the flat plate 7 so that the angle can be adjusted by replacing bolts. An axial guide rail 18 extending in a direction perpendicular to a virtual plane formed by the guide rails 11 is attached to the tilt plate 17. Dovetail grooves 19, 19 are formed on the upper and lower side surfaces of the axial guide rail 18, and a pair of sliders 20, 20 are slidably mounted in the dovetail grooves 19, 19 of the axial guide rail 18.

The slider 20 is guided by an axial guide rail 18 by a rotating operation of a handle 21 on the tilting plate 17 so as to be able to move forward and backward. The rotating operation of the handle 21 is provided on the tilting plate 17 and the slider 20. This is performed by a mechanism such as a rack and pinion (not shown).

A plate 22 is fixed to the slider 20, and a pair of bearing blocks 23, 23 are attached to the plate 22. A cylindrical portion 25 that holds a hollow rod 24 is rotatably held by the pair of bearing blocks 23,23. The rod 24 penetrates the cylinder 25 in the longitudinal direction of the cylinder 25. A chuck 26 is provided on the front end side of the cylindrical portion 25, and a pulley 27 is fixed to the rear end side of the cylindrical portion 25 by a fastening screw 28. The protruding length of the rod 24 penetrating the cylindrical portion 26 is the chuck 26
Determined by The pulley 27 rotates by receiving an output from a motor 29 fixed to a bearing block 23 holding a rear end side of the cylindrical portion 25 via a belt 30. The rotation of the pulley 27 causes the cylindrical portion 26 fixed integrally with the pulley 27 to rotate, and the rod 24 fixed to the chuck 26 rotates at the same speed as the pulley 27.

The axial center of the rod 24 is a fluid flow passage, through which a fluid such as a ground hardening agent, cement milk or water can pass. In the case of the two-liquid mixing type, the rod 24 is a double tube. At the tip of the rod 24, an opening is formed in which the cross-section center communicates with the flow passage of the rod 24, and a hole-saw type cutter 31 having a cylindrical edge formed with teeth is detachably attached. I have.

A seal member 32 according to the embodiment of the present invention is mounted between the chuck 26 and the cutter 31 on the distal end side of the rod 24. The seal member 32 includes a tubular portion 32a through which the rod 24 is inserted, and a flange portion 32b protruding from the tubular portion 32a.
32b has an insertion hole 32c through which the rod 24 is inserted. The insertion hole 32c has a diameter that allows a slight gap between the rod 24 and the wall surface of the insertion hole 32c so that the seal member 32 can rotate about the axis of the rod 24. Flange part
For example, a circular pad 32d made of synthetic rubber is fixed to 32b as an elastic body. The thickness of the pad 32d is thicker than the flange portion 32b, and the pad 32d has an insertion hole 32e through which the rod 24 is rotatably inserted. A screw 32f is screwed as a fixing means to the cylindrical portion 32a so that the seal member 32 can be fixed to the rod 24, and the seal member 32 is attached to the rod 24 by rotating the screw 32f toward the rod 24. It can be fixed.
The fixing means is not limited to the screw 32f.

When the screw 32f is screwed into the rod 24 to fix the sealing member 24 to the rod 24 and press the rod 24 against the steel sheet pile 3, the pad 32d is sandwiched between the flange 32b and the steel sheet pile 3, and the pad 32d is inserted into the insertion hole 32e.
By expanding to the side, the seal between the rod 24 and the pad 32d is further ensured.

A swivel connector 33 that allows the rod 24 to rotate is attached to the rear end of the rod 24. The swivel connector 33 has a hose 34 that supplies a geological improvement chemical solution.
Is attached.

[0020]

The fluid injection and piercing device according to the present invention is constructed as described above. Therefore, when a fluid is injected from the rod into the piercing hole after the piercing of the boring hole, the gap between the rod and the opening peripheral portion of the piercing hole is formed. Is blocked, the permeation of the fluid to be injected into the ground becomes sufficient, and the leakage loss of the fluid can be prevented.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of a geological improvement chemical injection device showing an embodiment of the present invention.

FIG. 2 is a sectional view of a main part of a sealing member.

[Explanation of symbols]

 3 ... Steel sheet pile 5 ... Base 10 ... Magnet 11 ... Universal joint 14 ... Moving base 15 ... Handle 20 ... Slider 23 ... Bearing block 24 ... Rod 26 ... Chuck 31 ... Hole saw cutter 32 ... Seal member

Claims (1)

(57) [Scope of request for utility model registration] 1. A fluid injection drilling device comprising a rotatable hollow rod provided with a hole saw type cutter for excavating ground at a front end thereof, and a fluid passage communicating with the rod from the rear end to the cutter. In the rod, a seal member having a cylindrical portion through which the rod is inserted and a flange portion protruding from the cylindrical portion on the cutter side is attached so as to be rotatable around an axis of the rod. An elastic body is formed on the cutter-side surface of the flange so as to be tightly sealed to an opening peripheral portion of a digging hole opened by a cutter, and the cylindrical portion is a fixing means for adjusting an axial position of the rod. A fluid injection perforation device, comprising: