JPH0671719B2 - A method of chipping with a water jet sprayed in bubbles - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for hanging (shaving) a covered object such as a concrete structure with a water jet.

[Conventional technology]

BACKGROUND ART Conventionally, as a method of hanging a hanging object such as a concrete structure, a method of spraying jet water to the hanging object is known.

[Problems to be solved by the invention]

However, when a covered object such as a concrete structure is suspended by jetting jet water, the work environment is poor because the water and the scattered chips are scattered and a significantly loud noise of 100 horns or more is generated. May hit the worker and get injured. Especially when performing jetting work by jetting jet water in a concrete cavern buried underground, noise is significantly increased due to the small working space.In addition, power transmission cables and communication cables are installed in the cavern. And the flying debris can damage those cables.

As another ejector cavitet nozzle device, the one shown in Japanese Utility Model Laid-Open No. 62-1764 is known.
In the case of this device, it is a system that generates bubbles in (inside) the ejected fluid itself, collides the bubbles with an object, and uses the "Hadjkel" energy of the bubbles,
Water jet using high pressure gas is
In the case of this water jet, which is disclosed in Japanese Patent No. 4955, a system in which a high-pressure gas is mixed into the fluid and the expansion force thereof is used to increase the speed of the fluid.

In the case of each of the above-mentioned documents, it is the same as the invention of the present case in that the effect is obtained by utilizing bubbles in the high-speed fluid, but in the case of each of the above-mentioned documents, it is necessary condition that the bubbles exist in the high-speed fluid. Is.

[Object and Structure of Invention]

An object of the present invention is to provide a chipping method using a water jet which is capable of advantageously solving the above-mentioned problems, and the gist of the present invention is that the front end is opened. The nozzle front covering cover 1 is filled with air bubbles 2, and jet water 4 jetted from a nozzle 3 arranged in the cover 1 is jetted through the air bubbles 2 to a to-be-polished object 5 to be covered. There is a hanging method by means of a water jet sprayed in a bubble characterized by picking up an object 5.

〔Example〕

 The present invention will now be described in detail with reference to the illustrated example.

FIGS. 1 and 2 show an example of an apparatus used for carrying out the present invention. An agitator 8 rotated by a motor 7 is provided in the melting tank 6 and the melting tank 6 is provided. The foaming agent adding device 9 is connected to the upper part of the
A water supply tank 10 is connected via an on-off valve 11, and a suction pipe 13 of an injection pump 12 is connected to the lower outlet of the dissolution tank 6.
Further, the discharge pipe 14 of the injection pump 12 and the compressed air supply pipe 16 of the compressed air supply device 15 composed of a compressor are connected to the inlet of the foaming device 17, and the flow rate adjusting valve 18 and the flow control valve 18 provided on the discharge pipe 14 are connected. The flow rate adjusting valve 19 provided in the compressed air supply pipe 16 is adjusted by a signal from the control panel 20.

A front end of the nozzle holding member 21 is connected to a rear end of a metallic nozzle front covering cover 1 having a front end opened, and a bubble injection is provided with a hose in the middle of the bubble outlet of the foaming device 17. One end of the pipe 22 is connected and its bubble injection pipe
The other end of 22 is fixed through the peripheral wall of the cover 1, and the high pressure water supply pipe 24 of the high pressure pump device 23 is connected to the nozzle 3 held by the nozzle holding member 21.

The foaming agent adding device 9 includes a hopper 26 containing a foaming agent 25 such as an anionic surfactant, a vertical cylinder 27 connected to an outlet of the hopper 26, and a vertical cylinder 27. It is composed of an upper gate 28 and a lower gate 29 provided slidably, and the upper gate 28 and the lower gate 29 are automatically opened and closed alternately by a signal from a control panel 30 via gate drive devices 31, 32. , When the upper gate 28 is opened while the lower gate 29 is closed, the foaming agent 25 drops from the hopper 26 to above the lower gate 29 in the vertical cylinder 27, and the upper gate 28 is closed. When the lower gate 29 is opened in the closed state, the foaming agent 25 drops from the inside of the vertical cylinder 27, and the foaming agent 25 is quantitatively added from the foaming agent adding device 9 into the dissolving tank 6. To be done.

Next, an embodiment of the present invention using the apparatus shown in FIGS. 1 and 2 will be described.

The foaming agent 25 is supplied from the foaming agent adding device 9 into the dissolution tank 6, and the water is supplied from the water supply tank 10 into the dissolution tank 6, and the foaming agent and the water are mixed in the dissolution tank 6. Is stirred and mixed by the stirrer 8, and the mixed liquid in the dissolution tank 6 is pumped for injection 12
The compressed air is supplied from the compressed air supply device 15 to the foaming device 17 to generate bubbles in the foaming device 17, and then the bubbles generated in the foaming device 17 are injected into the foaming device 17. It is injected into the cover 1 through the tube 22, and the cover 1 is filled with the bubbles 2.

The front edge of the cover 1 is arranged so as to be close to or in contact with the surface of the object to be covered 5 such as a concrete structure, and high-pressure water of about 500 to 2000 kgf / cm ² from the high-pressure pump device 23 flows through the high-pressure water pipe 24. The jet water 4 which is supplied to the nozzle 3 and jetted from the nozzle 3 passes through the front covering cover 1
The suspended object 5 is sprayed through the bubbles 2 filled therein, and the suspended object 5 is suspended by the jet of the jet water to form a recessed recess 33.

FIG. 3 shows another example of the foaming agent adding device 9, in which the outlet of the hopper 26 containing the foaming agent 25 is connected to the inlet of the valve box 35 of the rotary valve 34, and A rotary valve body 36 rotated by a drive device is housed in the valve box 35, and recesses of the same size are provided around the rotary valve body 36 at equal angular intervals, and a foaming agent in the hopper 26 is provided. 25 is filled in the concave portion of the rotary valve body 36, and
Is rotated and the foaming agent 25 is discharged quantitatively from the foaming agent adding device 9.

4 to 8 show another example of the nozzle front covering cover 1, which is shown in FIG. 4 and FIG.
In the case of the example, the metal cover body 37 is open at the front.
A slit 38 for discharging scraps that extends in the left-right direction at the bottom of the
Is provided, and the upper part of the rubber guide plate 39 for the drop guide is fixed to the front part and the rear part of the lower part of the cover body 37 with an adhesive or the like, and the distance between the front and rear rubber guide plates 39 is from the upper part to the lower part. The front portion of the nozzle 3 which is further reduced in size and extends in the front-rear direction is fixed through the rear plate of the cover body 37, and the bubble injection tube 22 is fixed through the upper plate of the cover body 37 to fix the cover 1. Nozzle 3 and bubble injection tube
22 is moved in the direction of arrow A. Alternatively, the debris and air bubbles drop between the debris discharge slit 38 and the front and rear rubber guide plates 39.

In the case of the second example shown in FIG. 6, the nozzle 3 and the bubble injecting pipe 22 are fixed through the metal cover body 37 having a shape obtained by dividing the hollow hemisphere into four equal parts. The rubber plate 40 is fixed to each of the two divided edges with an adhesive or the like to form the nozzle front covering cover 1,
The nozzle 3 and the bubble injection pipe 22 to which the cover 1 is fixed are moved in the direction of arrow A. In the case of the second example, it is possible to make it easier to drop the chips.

In the case of the third example shown in FIG. 7 and FIG. 8, the hollow hemispheres are cut into the hollow rubber hemispheres at a lower portion over a range of about 90 °, and the hollow hemispheres are respectively formed at the notch edges. Auxiliary cover made of soft rubber that is divided into 8 parts
The side edge portion of 42 is fixed by an adhesive or the like, and the nozzle front covering cover 1 is constituted by the hard rubber cover main body 41 and the pair of soft rubber auxiliary covers 42 fixed to the hard rubber cover main body 41. The nozzle 3 is fixedly penetrated through the central portion thereof, and the bubble injection pipe 22 is fixed through the central upper portion of the soft rubber cover body 41. As the hard rubber constituting the cover body 41, for example, one having a hardness of 80 to 90 degrees is used, and as the soft rubber constituting the auxiliary cover 42, for example, one having a hardness of 50 to 60 degrees is used. .

FIG. 9 shows an example of a foaming device, in which the discharge pipe 14 for the foaming agent aqueous solution and the compressed air supply pipe 16 are connected to one end of a tank 43 extending in the lateral direction, and The bubble injection pipe 22 is connected to the end of the tank 43, and the inside of the tank 43 has a plurality of wire meshes 44 attached at intervals in the tank longitudinal direction.
Further, a large number of resistance particles 45 such as glass beads are housed in each compartment of the tank 43, and a particle outflow prevention wire net 46 is attached to the bubble outlet at the other end of the tank 43. Bubbles are generated by passing the foaming agent aqueous solution and the air through the fine particles such as the resistance particles 45 and the wire netting 44. In FIG. 9, P is a pressure gauge.

When the chipping method of the present invention is applied to the beaming in a concrete cave having a cable, it is possible to prevent the cable from being damaged by the scattering of the chippings, and the scattering of the water and the chippings causes a wide range of contamination in the channel. Can be prevented.

〔The invention's effect〕

According to the present invention, the jet water 4 jetted from the nozzle 3 is filled with the bubbles 2 filled in the nozzle front covering cover 1.
Since it passes through the inside of the jet water 4, it is possible to reduce the propagation of high frequency due to the vibration of the air near the jet water 4 to reduce the generation of noise, and the vicinity of the jetting portion of the jet water 4 is covered by the cover 1. , Jet water 4 is covered 5
It is possible to reduce the collision noise when the vehicle collides with the vehicle and to prevent the scattering of water and chips and ensure the safety of the worker.

[Brief description of drawings]

FIG. 1 is a partially longitudinal side view showing an example of an apparatus used for carrying out the present invention, FIG. 2 is a longitudinal side view showing an apparatus for adding a foaming agent in the apparatus, and FIG. 3 is a foaming agent. It is a vertical side view which shows the other example of an addition apparatus. 4 to 8
The figure shows an example using a different cover, FIG. 4 is a perspective view showing the first example, FIG. 5 is a longitudinal side view thereof,
FIG. 6 is a perspective view showing the second example, FIG. 7 is a front view showing the third example, and FIG. 8 is a side view thereof. FIG. 9 is a partially longitudinal side view showing an example of the foaming device. In the figure, 1 is a cover for covering the front of the nozzle, 2 is a bubble,
3 is a nozzle, 4 is jet water, 5 is a hanging object, 6 is a dissolution tank, 8 is a stirrer, 9 is a foaming agent adding device, 10 is a water tank,
12 is a pump for injection, 13 is a suction pipe, 14 is a discharge pipe, 15 is a compressed air supply device, 16 is a compressed air supply pipe, 17 is a foaming device, 18
And 19 are flow rate adjusting valves, 21 is a nozzle holding member, 22 is a bubble injection pipe, 23 is a high pressure pump device, 24 is a high pressure water supply pipe, 25 is a foaming agent, 26 is a hopper, 27 is a vertical cylinder, and 28 is an upper stage. Gate, 29
Is a lower gate, 37 is a metal cover body, 39 is a rubber guide plate for a drop guide, 40 is a rubber plate, 41 is a hard rubber cover body, and 42 is a soft rubber auxiliary cover.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-64-104955 (JP, A) SAI-KAI Sho 62-1764 (JP, U)

Claims (1)

[Claims] 1. A nozzle front covering cover 1 having an open front end is filled with air bubbles 2, and jet water 4 sprayed from a nozzle 3 arranged in the cover 1 is replaced with the air bubbles 2.
A method of hanging by a water jet sprayed in bubbles, characterized in that the object to be hung 5 is sprayed to the object to be hung, and the object to be hung 5 is hung.