JP2501112B2 - Drilling device with abrasive jet - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to an abrasive jet drilling device for drilling holes in a structure.

[Prior Art] A cutting method using an abrasive jet, in which a granular material such as sand is sprayed together with a high-pressure water jet onto an object to be cut, such as a concrete structure or rock, to cut the object is known, and various cutting objects are known. It is used when cutting things. In particular, the cut surface is clean, and it is preferable that any cut surface can be formed by moving the jet nozzle.

By this cutting method, for example, as shown in FIG. 1 for reforming a building, when a part of the floor A is cut to form the opening B, the grooved steels C1, C1, around the opening B of the floor A, C
2, it is necessary to reinforce with C2.

Therefore, as shown in FIG. 2, the anchor hole E for fixing the channel steel to the lower surface of the floor A with the anchor bolt D must be drilled.

When this anchor hole E is drilled with an electric drill, for example,
Noise and vibration are problems.

Therefore, if the holes are drilled by the abrasive jet, the problems of noise and vibration will be eliminated, but since the hole diameter will be different at each site, the countermeasure will be a problem.

[Problem to be Solved by the Invention] Therefore, an object of the present invention is to provide a drilling device by an abrasive jet capable of changing the hole diameter.

[Means for Solving the Problems] According to the present invention, in a drilling device using an abrasive jet for drilling a hole in a structure, a jet nozzle for injecting particulate matter with a high-pressure water jet, and the nozzle. Via a vacuum chamber connected to a vacuum source for supporting one end of the nozzle on the opening side and supporting it via a first spherical bearing, and a second spherical bearing provided so that the other end of the nozzle is eccentric A sprocket for supporting the sprocket and a driving means for driving the sprocket are provided, and a holding body of a bearing for supporting the sprocket is provided with a long hole. The bearing is fixed to a bracket by bolts so as to be adjustable.

[Explanation of Operation and Effect] Therefore, the second spherical bearing that rotates the sprocket and is eccentric causes the tip of the jet nozzle to make a circular motion with the first spherical bearing as the pivot point, and the problem of noise and vibration is generated by the abrasive jet. A circular hole can be drilled instead. Also,
Since the nozzle faces outward with respect to the centerline of rotation,
The hole can be drilled in a state where the base is widened, and for example, when an anchor bolt is buried, the pulling-out physical strength is improved. Further, the eccentrically provided second spherical bearing fixes the bearing so as to be movable in the vertical direction, makes the eccentricity variable, and adjusts the angle of the nozzle with respect to the rotation axis. This is convenient because the hole diameter can be adjusted in this way.

[Preferred Embodiment] In carrying out the present invention, it is preferable to provide an adsorption chamber connected to a vacuum source on a side portion of the vacuum chamber. This way,
In cooperation with the vacuum chamber, the device can be more securely fixed, for example to the floor.

In practicing the present invention, it is preferable to provide a protective cover provided on the side facing the apparatus with a ceramic reflector and connected to a vacuum source. By doing so, the slurry can be suitably recovered.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIGS. 3 and 4 show a state in which an annealer hole E is drilled on a floor A in a room with an abrasive jet (hereinafter referred to as a jet) J using a jet nozzle (hereinafter referred to as a nozzle) N.

High-pressure water (for example, 2000 kg / cm ² ) is supplied to the nozzle N from a high-pressure pump (not shown) via a high-pressure water supply hose 1, and granular material is sent from an abrasive material line (not shown) via an abrasive material supply hose 2. It is designed to be used.

A soundproof / water leakage cover (hereinafter referred to as a cover) 3 for housing the lower portion of the nozzle N is formed in a box having a substantially rectangular shape with an opening at the bottom, and is connected to a slurry recovery machine by a slurry recovery hose 4 via a vacuum pump (not shown). Has been done.

On both sides of the cover 3, rectangular adsorption boxes 5 and 5 each having an open bottom are provided, and the boxes 5 and 5 are connected to a vacuum pump (not shown). A packing 6 for holding a vacuum pressure is provided on the lower edges of the cover 3 and the suction boxes 5, 5.

The nozzle N is supported on the upper wall of the cover 3 via a first spherical bearing 7 and a vacuum pressure holding packing 8. An inner race of the second spherical bearing 9 is fixed to the upper portion of the nozzle N, and the outer race is eccentrically attached to the power transmission sprocket 10. This sprocket 10 is a bracket 11 provided on the upper wall of the cover 3.
Is supported on the axis of the first spherical bearing 7 via a bearing 12, and a drive motor 13 is fixedly mounted on the bracket 11. A chain 15 is stretched between a drive sprocket 14 fixed to the output shaft of the drive motor 13 and the power transmission sprocket 10.
3, the sprocket 14 and the chain 15 constitute driving means for the power transmission sprocket 10. Therefore, when the motor 13 is driven, the power transmission sprocket 10 rotates,
The power transmission sprocket 10 is adapted to make a circular motion of a swing angle θ with the tip of the nozzle N as a pivot point through the eccentric second spherical bearing 9. The swing angle θ can be set to 1.5 ° to 3 ° depending on the injection pressure, the flow rate abrasive nozzle diameter, and the inner diameter of the anchor hole E. Bracket to set this swing angle θ
A long hole extending in the axial direction may be provided in the holding body 12a of the bearing 12 attached to 11, and the bolt 12 attached to the bracket 11 may be adjusted and fixed.

5 and 6 show a protective cover 20 for receiving the jet J. The protective cover 20 is a cylindrical container having an open top, and is connected to a slurry recovery machine via a vacuum pump (not shown) by a slurry recovery hose 22 connected to a slurry recovery port 21, and holds a vacuum pressure at the upper edge. Packing 23 is provided.

Inside the protective cover 20, a ceramic plate 24 having an L-shaped cross section is provided so as to face upward so that the jet J is deenergized.

A support pipe 26 is attached to the protective cover 20 via an air cylinder 25, and the air cylinder 25 is extended to press and support the protective cover 20 at the anchor hole E drilling position of the ceiling F.

When drilling the anchor hole E, the nozzle N is positioned at the drilling position, the suction boxes 5 and 5 are evacuated, and the apparatus is suction-fixed to the floor A, and the protective cover 20 is fixed to the ceiling F. Then, the position of the bearing 12 is set in advance, and the deflection angle θ
Adjust according to the hole diameter.

Next, the motor 13 is driven to rotate the drive transmission sprocket 10 via the drive sprocket 14 and the chain 15, and the second spherical bearing 9 causes the lower end of the nozzle N to pivot about the first spherical bearing 7 as the pivot point θ. The circular hole is moved in a circular direction, and the anchor hole E having a predetermined hole diameter is drilled in the floor A by the jet J.
Then, the slurry is recovered from the cover 3 via the hose 4, and the slurry is recovered from the protective cover 20 via the hose 22.

[Effects of the Invention] As described above, according to the present invention, the deflection angle θ can be changed by moving the second spherical bearing, so that the radius of gyration of the circularly moving nozzle can be changed, and as a result, It is possible to drill holes with a diameter that matches the site. Therefore, it is possible to provide versatility with one device, which is suitable for field work.

[Brief description of drawings]

FIG. 1 is a plan view of a floor explaining anchor holes for carrying out the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 is a partial sectional view showing an embodiment of the present invention. 4 is a perspective view showing a protective cover and a support pipe, and FIG. 6 is a side sectional view showing the protective cover. A ... Floor, E ... Anchor hole, J ... Abrasive jet, N ... Jet nozzle, 3 ... Soundproof / water leak cover, 5 ... Adsorption box, 7 ... First spherical bearing, 9 ...
… Second spherical bearing, 10 …… Power transmission sprocket, 13…
… Drive motor, 20 …… Protective cover, 24 …… Ceramic plate, 25 …… Air cylinder, 26 …… Support pipe

Claims (1)

(57) [Claims] 1. In a drilling device using an abrasive jet for drilling a hole in a structure, a jet nozzle for jetting particulate matter together with a high-pressure water jet, and one end of the nozzle are housed in the opening side. A vacuum chamber connected to a vacuum source supported via a first spherical bearing, a sprocket supporting the other end of the nozzle via a second spherical bearing eccentrically provided, and the sprocket are driven. Drive means, and a long hole in a holder of a bearing for supporting the sprocket. The bearing is fixed to a bracket by bolts so as to be adjustable. .