JPH11104528A - Flesh concrete jetting nozzle device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent clogging even when used at a low pressure and also to sufficiently mix a flesh concrete material with a chemical. SOLUTION: In a flesh concrete jetting nozzle device in which a flesh concrete material FC forcibly fed from an introducing part 14 of a nozzle pass 30 is mixed with a chemical CR and discharged from a discharge port of a discharge part 12, floating gas is jetted toward inside of the nozzle pass 30 to float the material FC, and a flow of the material FC is bent and decelerated in a bend at the tip of the nozzle pass 30, and also the chemical CR is jetted from an atomizing port 15a of a chemical atomizing pipe 15 projecting into the discharge part 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nozzle device for spraying fresh concrete used when spraying or applying a fresh concrete material or a fresh mortar material to a ceiling, a wall, a side surface or the like of a room, a tunnel, a road or the like. is there.

[0002] When a ceiling or a wall surface of a tunnel or the like is solidified with concrete, a fast-setting fresh concrete material or a fresh mortar material is used. This fresh concrete material and fresh mortar material
The state immediately after kneading cement, aggregate and water is used. Fresh concrete material is generally called ready-mixed concrete. Hereinafter, the case where a fresh concrete material is used as the spray material will be mainly described, but it goes without saying that the fresh mortar material is included in the fresh concrete material.

[0003]

2. Description of the Related Art Conventionally, when a fresh concrete material is sprayed on a wall surface or the like, a spray nozzle device has been used. This device includes a fresh concrete material pumping passage, and a drug supply passage intersecting the pumping passage. In the pumping passage, the fresh concrete material and the drug (quick-setting agent) are mixed and applied to a wall surface or the like. I'm spraying.

[0004]

The conventional spray nozzle device has the following problems.

(1) Since the chemical is supplied to the inner wall side of the fresh concrete material pumping passage, it is not sufficiently mixed with the fresh concrete material flowing in the central portion of the pumping passage. Therefore, quick setting of the fresh concrete material cannot be averaged, so that it is difficult to obtain concrete having uniform strength over the entire surface.

(2) In the vicinity of the intersection of the Y-pipe between the pressure feeding passage and the chemical supply passage, the fresh concrete material which has come into direct contact with the quick-setting agent begins to solidify, so-called quick-setting concrete is formed, and the concrete grows. Nozzle is clogged. Therefore, frequently, for example, 3
The spraying operation must be interrupted once every 5 minutes, and the nozzle device must be removed, replaced, disassembled, inspected, repaired, etc., so that the working time becomes longer and the spraying operation is not efficient.

Therefore, a method of pumping a fresh concrete material at a high pressure, for example, 5 kg / cm ² has been adopted. However, in this method, dust and mist are generated, and the working environment is deteriorated. Also, if the distance between the sprayed wall surface and the spray nozzle device is too close, the fresh concrete material collides with the wall surface and scatters, so that the thickness of the concrete adhered to the wall surface becomes uneven and a strong concrete wall surface is formed. Can not do it. Therefore, it is impossible to apply the fresh concrete material to the wall surface by moving the spray nozzle device so as to make contact with the wall surface.

In view of the above circumstances, an object of the present invention is to prevent the nozzle from being clogged even when used at a low pressure. Another object is to ensure that the mixing of the fresh concrete material and the drug is sufficient.

The present invention is directed to a nozzle device for spraying fresh concrete in which a chemical is mixed into a fresh concrete material or a fresh mortar material press-fitted from an introduction portion of a nozzle passage and discharged from a radiation port of a radiation portion; Material levitation means for injecting a levitation gas inward, direction regulating means for curving the flow of the material at the radiating portion of the nozzle passage, and a drug for spraying a drug into the material passing through the radiating portion And a supply means, comprising: a spray nozzle device for fresh concrete.

[0010] In the spray nozzle device, a radiating portion is provided at a front end portion of a nozzle passage, and an introducing portion is provided at a rear end portion. The apparatus includes a material floating means for injecting a floating gas toward the inside of the nozzle passage. As this material floating means, for example, a straight cylindrical double pipe is used. The double pipe includes an outer pipe and an inner pipe which are opposed to each other via a floating gas flow path, and the inner pipe has an injection hole or a slit for injecting the floating gas. The diameter, number, position, or number of slits, width, length,
The position and the like are appropriately selected as needed.

The distal end of the outer tube protrudes from the distal end of the inner tube, and the amount of protrusion is appropriately selected as required.

A flow stop member for closing the floating gas passage is provided between the distal end of the inner tube and the outer tube. Although this jet stop member is provided with an injection gap,
It is not always necessary to provide this injection gap. That is, the injection gap may be omitted, and the floating gas may be injected only from the injection hole.

At the tip of the nozzle passage, there is provided a direction regulating means for curving and decelerating the flow of the material. As the direction regulating means, for example, a curved portion provided at the tip of the nozzle passage is employed. The direction restricting means is not limited to the curved portion. For example, a curved member is protruded from the inner peripheral surface on the distal end side of the straight cylindrical outer tube, and the flow of the fresh concrete material passing through the radial portion of the nozzle passage. It may be curved. Further, the tip of the inner tube and the tip of the outer tube having the double structure may be curved in opposite directions. When two curved portions are provided along the flow direction of the fresh concrete material in this way, the material is double decelerated, so that the mixing ratio of the medicine is extremely good.

[0014] The radiating portion of the nozzle passage is provided with a drug supply means for spraying a drug into the fresh concrete material passing through the radiating portion. As this medicine supply means,
For example, a drug spray tube is used. The tip of the spray tube protrudes into the radiating portion of the nozzle passage, and the position of the spray port is appropriately selected as needed. For example, if the spray port is opened in the flow direction of the fresh concrete material and is positioned at the center of the radiating section, the mixing ratio of the medicine can be improved.

A sprayer is provided at the tip of the spray tube. The attachment position of the sprayer is appropriately selected as needed, but is installed, for example, at a position slightly retracted from the spray port in order to prevent clogging of the spray port.

At the rear end of the spray tube, a medicine supply port and a pressure gas supply port are provided. Gas is supplied to the pressure gas supply port and the floating gas flow path from the same gas supply source, but it goes without saying that this gas supply source may be provided separately.

A radiation cover may be attached to the tip of the nozzle passage. The material, shape, and the like of the radiation cover are appropriately selected as needed. For example, a radiation cover formed of a synthetic resin in a bowl shape is used.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS. The spray nozzle device 1 includes a nozzle body 3 and a holding body 2
5 is provided. The nozzle body 3 has a straight cylindrical double pipe structure, and includes an outer pipe 4 and an inner pipe 5 which face each other via a floating gas flow path 26. The inner pipe 5 is provided with a plurality of injection holes 6, and the number and positions of the injection holes 6 are appropriately selected as needed. For example, the injection holes 6 having a diameter of 0.2 mm
Formed at intervals of 20 mm. Note that a slit may be used instead of the injection hole. The number, width, length, position, interval, and the like of the slits are appropriately selected as necessary. For example, slits having an interval of 0.1 mm and a length of 5 mm to 20 mm are used.

At the rear end of the inner tube 5, there is provided an introduction portion 14 of a spray material, that is, a fresh concrete material or a fresh mortar material. The tip 5a of the inner tube 5
A stop member 10 is provided between the outer tube 4 and the outer tube 4. The flow stop member 10 is formed in a ring shape, and an injection gap 11 is provided on the inner pipe side, and the position thereof is appropriately selected as needed. The injection gap 11 is not always necessary, and may be omitted.

The distal end portion 5a of the inner tube 5 is retracted from the distal end portion of the outer tube 4 and is located at the radiating portion 12 of the nozzle passage 30, but this position is appropriately selected as needed.

At the rear end of the inner tube 5, an introduction portion 14 is provided. The introduction portion 14 communicates with a supply source of a fresh concrete material FC (not shown).

A curved portion 4a is provided at the distal end of the outer tube 4, and the opening surface R of the radiation port 12a at the distal end is inclined downward.

The outer tube 4 is provided with a chemical spray tube 15. The tip of the spray pipe 15 protrudes into the radiation section 12, and the spray port 15 a is located on the central axis C of the inner pipe 5. The spray port 15a faces the radiation port 12a of the radiation section 12, and faces the flow direction of the fresh concrete material FC passing through the radiation section 12. The center axis p of the tip 15a of the spray tube intersects perpendicularly with the opening surface R of the radiation port 12a.

In the vicinity of the spray port 15a, a sprayer 20 is provided.
As shown in FIGS. 4 and 5, the sprayer 20 is a disk having a through hole 21 in the center, and has a hemispherical concave portion 21a formed at the end face on the outlet side. The external thread 21c is formed in the outer peripheral part. This sprayer 2
0 is a spray port 1 to prevent the hole 21 from being clogged.
It is arranged at a position slightly retracted from 5a. Nebulizer 20
The shape, the number of holes, the position, and the like are appropriately selected as needed.

A pressure gas supply port 24 and a medicine supply port 22 are provided at the rear end of the medicine spray tube 15. The pressure gas supply port 24 communicates with a pressure supply source (not shown) via an air valve 23.

The air valve 23 is provided on the holding body 25. The air valve 23 communicates with a floating gas flow path 26 between the outer pipe 4 and the inner pipe 5. 27 is a valve for adjusting the air amount and the medicine supply amount.

Next, the operation of this embodiment will be described. After directing the radiation outlet 12a of the spray nozzle device 1 to the side surface of the tunnel (not shown), a fresh concrete material FC composed of mixed cement, aggregate, and water is supplied from the supply source of the fresh concrete material to the introduction portion 14. At the same time, the air valve 23 is opened to supply the pressurized air from the pressurized gas supply source to the floating gas flow path 26 and the pressurized gas supply port 24 of the medicine spray tube 15.

Then, the nozzle passage 30 extends from the injection hole 6.
The compressed air PA is ejected toward the central axis C of the fresh concrete material FC passing through the nozzle passage 30.
It is separated from the inner peripheral surface of the inner tube 5. Therefore, the fresh concrete material FC is directed to the radiating portion 12 while floating, so that no fluid resistance is generated on the inner peripheral surface 5f of the inner pipe 5, so that the fresh concrete material F
C flows smoothly.

At this time, the pressurized air PA in the direction of the central axis C is also jetted from the jet gap 11 to the radiating section 12. The pressure air PA supplied to the floating gas flow passage 26 needs to have a pressure enough for the fresh concrete material FC to float,
As the pressure, for example, 0.2 kg / cm ^{2 to} 0.5 kg / cm ² is selected.

Drug CR such as quick-setting agent in drug spray tube 15
The pressurized air PA is sprayed and dispersed by the sprayer 20 and is emitted while spreading radially from the spray port 15a, and is mixed into the fresh concrete material FC passing through the inside of the radiating portion 12.

The distal end of the nozzle passage 30 has a curved portion 4a
Is provided, the fresh concrete material FC passing through the radiating section 12 is changed in flow direction and decelerated, and the spray port 15a faces the center of the radiating port 12a of the radiating section 12, and the radiating section Since the chemical CR is sprayed radially toward the flow direction of the fresh concrete material FC passing through the inside 12, the mixing efficiency of the chemical CR is extremely improved.

Therefore, the fresh concrete material FC radiated from the radiating port 12a is radiated from the radiating port 12a in a state of being sufficiently mixed with the medicine CR, and adheres to the side surface of the tunnel.

A second embodiment of the present invention will be described with reference to FIG. 6. The difference between this embodiment and the first embodiment is as follows. (1) The injection gap 11 of the flow stop member 10 is omitted. That is, the flow stop member 10 seals the tip of the floating gas flow path 26. (2) The distal end portion 5a of the inner tube having the double structure is curved in a direction opposite to the curved portion 4a of the distal end portion of the outer tube. When two curved portions are provided along the flow direction of the fresh concrete material in this way, the material is double decelerated, so that the mixing ratio of the medicine is extremely good.

A third embodiment of the present invention will be described with reference to FIG. 7. The difference between this embodiment and the first embodiment is that a radiation cover 40 is provided at the tip 4a of the outer tube 4. is there. The radiation cover 40 is formed in a bowl shape, and its opening surface 40F is inclined downward with respect to the center axis C of the nozzle passage 30. This opening face 40F is located at the tip 1 of the chemical spray tube.
It is formed perpendicular to the central axis p of 5a. The shape, size, and the like of the radiation cover 40 are appropriately selected as needed.

In this embodiment, for example, the supply pressure of the fresh concrete material FC is 2 kg / cm ^2, and the pressure air supplied to the floating gas flow path 26 is 0.2 kg / cm ² to 0.1 kg / cm ² .
And 5 kg / cm ^2, the pressure air supplied to the drug injection pipe 15 to 0.5Kg / cm~2Kg / cm ^2, while the spraying radiation cover 40 of the nozzle device 1 so as to abut against the side walls TF tunnel Radiates fresh concrete FC.

This operation corresponds to a so-called painting operation for applying fresh concrete FC to the side wall TF with a trowel, but since the pressure is low, the fresh concrete FC
The concrete side wall having a uniform thickness can be formed without being blown off from F.

[0037]

As described above, the present invention is configured as described above, so that nozzle clogging can be prevented. Further, since it can be used even at a low pressure, it is possible to apply a fresh concrete material. Further, since the agent is sufficiently mixed with the fresh concrete material, a concrete having uniform strength can be obtained.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a diagram showing a positional relationship between a discharge port and an injection port in FIG. 2;

FIG. 4 is an enlarged plan view of the sprayer.

FIG. 5 is a longitudinal sectional view of FIG.

FIG. 6 is a longitudinal sectional view showing a second embodiment of the present invention, and is a view corresponding to FIG.

FIG. 7 is a sectional view showing a third embodiment of the present invention, and is a view corresponding to FIG.

[Description of sign]

 DESCRIPTION OF SYMBOLS 1 Spray nozzle apparatus 4 Outer pipe 5 Inner pipe 6 Injection hole 10 Inlet member 11 Injection gap 12 Radiation part 15 Chemical spray pipe 20 Sprayer 22 Chemical supply port 24 Pressure gas supply port 26 Gas channel for floating FC Fresh concrete material CR Chemical PA pressure air

Claims (14)

[Claims] 1. A nozzle device for spraying fresh concrete, wherein a chemical is mixed with a fresh concrete material or a fresh mortar material press-fitted from an introduction portion of a nozzle passage and discharged from a radiation port of a radiation portion. Material levitation means for injecting levitation gas toward the direction, direction regulating means for curving the flow of the material at the radiating portion of the nozzle passage, and drug supply means for spraying a drug into the material passing through the radiating portion A spray nozzle device for fresh concrete, characterized by comprising: 2. A nozzle passage comprising an outer tube and an inner tube which are opposed to each other via a floating gas flow path.
The spray nozzle device for fresh concrete as described in the above. 3. A spray nozzle device for fresh concrete according to claim 2, wherein the inner pipe is provided with a plurality of injection holes or slits. 4. A nozzle device for spraying fresh concrete according to claim 2, wherein the tip of the outer pipe projects from the tip of the inner pipe. 5. The spray nozzle device for fresh concrete according to claim 2, wherein the tip of the outer pipe and the tip of the inner pipe are curved in directions opposite to each other. 6. The spray nozzle device for fresh concrete according to claim 2, wherein a flow stop member is provided between the outer pipe and the tip of the inner pipe. 7. The spray nozzle device for fresh concrete according to claim 6, wherein the flow stop member has an injection gap. 8. The apparatus according to claim 1, wherein the direction regulating means is a curved portion at the tip of the nozzle passage. 9. The spray nozzle device for fresh concrete according to claim 1, wherein the medicine supply control means is a medicine spray tube, and a tip end thereof projects into the radiation part. 10. The spray nozzle device for fresh concrete according to claim 9, wherein the spray port at the distal end of the chemical spray tube is located at the center of the radiating section. 11. The spray nozzle device for fresh concrete according to claim 10, wherein the spray port is opened in a flow direction of the fresh concrete material. 12. The spray nozzle device for fresh concrete according to claim 9, wherein the chemical spray tube has a sprayer built in at a position retracted from the spray port. 13. The spray nozzle device for fresh concrete according to claim 1, wherein a radiation cover is provided at an end of the nozzle passage. 14. The spray nozzle device for fresh concrete according to claim 13, wherein an opening surface of the radiation cover is inclined with respect to a central axis of the nozzle passage.