JPH0518193A - Mixer for dry type concrete spray device - Google Patents

Abstract

PURPOSE: To stabilize the quality of sprayed concrete, reduce the number of rebounds, and then, improve the work environment by uniformly mixing a liquid, such as the water, etc., in a concrete material transported through a mixing passage in a mixer for dry type concrete spraying device. CONSTITUTION: A ring member 15 formed in an annular shape is installed to a mixing passage 4 to which a concrete material is supplied from one end and many inwardly directed ejectors 16 are formed on the ring member 15. Then water supplying sections 6 and 7 are formed by connecting a high-pressure pump 8 to the ejectors 16. A liquid is successively and continuously mixed with the concrete material by supplying the liquid from the ejectors 16 and the mixture is discharged from the other end of the passage 4. In a mixer 1 for dry type concrete spraying device constituted in the above-mentioned way, the first and second water supplying sections 6 and 7 are separately formed in the passage 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mixing device for a dry concrete spraying device, in which a concrete material and a liquid are separately supplied and sequentially mixed and supplied to an injection nozzle.

[0002]

2. Description of the Related Art Conventionally, there has been a dry concrete spraying technique and spraying device of this type.

In a conventional mixing device of a spraying device, a water supply portion is formed at one location in a mixing passage, and in this water supply portion, eight water supply portions are directed toward a center of a mixing tube or a ring member forming the mixing passage. It is assumed that water injection holes of a certain degree are formed.

Therefore, the concrete material transferred in the mixing passage is supplied with water only once in the mixing passage.

[0005]

According to such a conventional mixing device, the total amount of the water having a proper water-cement ratio is adjusted at this one place according to the amount of the concrete material transferred in the mixing passage. The chances of contact between the water and the concrete material are limited as it is supplied to.

The inner diameter of the water injection hole of such a device is 2 m.
Since it is comparatively large at about m, it is not possible to obtain a sufficient flow velocity, and the concrete material is mixed with an excessive amount of water and, conversely, a part that is contacted with and mixed with an excessive amount of water. It was inevitable that the water-cement ratio of the concrete produced would become unstable.

This inevitably results in a decrease in concrete strength, an increase in rebound and an increase in dust, decreases the reliability of the structure, wastes materials, and causes diseases such as silicosis of workers. It was

The present invention has been made in view of such circumstances, and a liquid such as water is uniformly mixed with the concrete material transferred in the mixing passage to stabilize the quality of the shotcrete and reduce the rebound. However, the purpose is to improve the working environment.

[0009]

In order to achieve this object, the invention according to claim 1 provides a ring member formed in an annular shape in a mixing passage to which the concrete material is supplied from one end, and the ring member is provided in this ring member. In addition to forming a large number of injection holes facing the inner surface side, a high-pressure liquid supply source is connected to these injection holes to form a water supply unit, and liquid is supplied from the injection holes to successively connect the concrete material and the liquid. In the mixing device for a dry concrete spraying device, which is selectively mixed and discharged from the other end of the mixing passage, a plurality of water supply units are installed in the mixing passage so as to be separated from each other.

[0010]

According to the invention described in claim 1, since a plurality of water supply portions having ring members are installed separately in the mixing passage, water, etc., to be supplied to the concrete material transferred in the mixing passage. The liquid amount can be distributed and supplied in plural.

Therefore, as compared with the conventional method in which the entire amount of water is added at one place, the material has more opportunities to come into contact with water, which makes it possible to produce a more homogeneous concrete, and to obtain concrete of stable quality. Both rebound and dust can be significantly reduced.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in the drawings.

In FIG. 1, a mixing device 1 is a cylindrical body 2
And a water supply device 3.

The main body 2 is formed in a cylindrical shape, and a mixing passage 4 is formed inside the main body 2.

As shown by an arrow A, the concrete material for the dry spraying work is supplied by compressed air from one end side (the right end side in the drawing) of the mixing passage 4 of the main body 2, and this mixing is performed. A spray nozzle 5 is attached to the other end of the passage 4.

Then, in the mixing passage 4 of the mixing apparatus 1 of this embodiment, the first and second water supply sections 6 and 7 for supplying water from the water supply apparatus 3 to the concrete material are installed separately. .

That is, the water supply device 3 supplies a required liquid such as water (hereinafter, simply referred to as water W) from a tank (not shown) through the high pressure pump 8 to the first and second water supply units 6 and 7.
It has a pipe 11 for supplying to.

The first and second pipes 11 are also provided.
In front of the water supply parts 6, 7 of the
Flow rate adjusting valves 12 and 13 are respectively installed to adjust the amount of water supplied to the water.

The first and second water supply units 6 and 7 are constructed as follows, for example.

In this embodiment, the structures of the first water supply section 6 and the second water supply section 7 are substantially the same, so the first water supply section 6 will be described below with reference to FIGS. 2 and 3. The structural description of the second water supply unit 7 is omitted.

That is, the first water supply section 6 is connected to the connecting pipe 14
And the ring member 1 fitted to the inner surface side of the connecting pipe 14.
5, and the mixing passage 4 is formed on the inner surface side of the connecting pipe 14 and the ring member 15.

On the peripheral surface of the ring member 15, a large number of injection holes 16 communicating between the inner and outer surfaces of the ring member 15 are arranged in a plane orthogonal to the central axis O of the mixing passage 4 and bored. .

In the case of this embodiment, these injection holes 1
6 are all bored toward the central axis O.

Connection pipe 1 into which the ring member 15 is fitted
On the inner surface of 4, the injection hole 16 of the ring member 15 is formed.
The annular groove 17 along the entire circumference of the inner surface including the portion where
And the seal rings 18 are arranged on both sides of the annular groove 17.

The pipe 11 is inserted in the annular groove 17.
Are communicated with each other, and the water passing through the pipe 11 is supplied to the large number of injection holes 16 through the annular groove 17 and is injected from the injection holes 16 toward the central axis O of the mixing passage 4 so that the water is passed through the mixing passage 4. It is designed to supply water to the concrete material being transferred.

The above structure has the first water supply unit 6 and the second water supply unit 6.
Although common to the water supply section 7 of FIG. 1, the injection directions of the injection holes 16 formed in the ring member 15 of the first water supply section 6 and the second water supply section 7 are not the same, and As shown in FIG. 4, they are different.

In FIG. 4, the solid line shows the injection direction by the ring member 15 of the first water supply section 6, and the phantom line shows the injection direction by the ring member 15 of the second water supply section 7, both rings. If the member 15 is a single body, it has the same shape and the injection holes 16 are similarly formed in the same direction.

However, in this embodiment, the ring member 15 of the second water supply unit 7 is rotationally displaced by a half pitch in the circumferential direction with respect to the ring member 15 of the first water supply unit 6 to cause the second water supply. It is attached to the connecting pipe 4 of the part 7.

Therefore, the directions of water injection from these ring members 15 to the concrete material transferred in the mixing passage 4 are the same as the first water supply section 6 and the second water supply section 7.
And are different.

Therefore, when the injection state of the water supplied from these ring members 15 to the mixing passage 4 is viewed from the cross-sectional direction, the cross-sectional area of the mixing passage 4 is subdivided as shown in FIG. Therefore, there is an advantage that a homogeneously mixed concrete material can be obtained by dispersing and supplying water in the concrete material transferred in the mixing passage 4.

The embodiment configured as described above functions as follows.

That is, when the concrete material transferred by the arrow A in FIG. 1 reaches the first water supply section 6, a part of the amount of water to be supplied to this concrete material (for example,
50%) is injected from the injection holes 16 formed in the ring member 15 of the first water supply unit 6 to the concrete material in the mixing passage 4.

At this time, the number of the water injection holes 16 is remarkably increased as compared with the conventional case. Therefore, if the injection port diameter is the same, the cross-sectional area of water passage is increased by the increased number.

However, since the amount of water supplied is the same as a whole, the amount of water passing through one injection hole 16 decreases, and as a result, the injection pressure decreases.

This means that the water will not be jetted at a sufficient flow rate, resulting in insufficient mixing with the concrete material.

In order to prevent this, the diameter of the injection hole 16 is 0.4
Sufficient flow velocity can be obtained by setting the small diameter of about 0.9 mm and supplying high-pressure water to the small-diameter injection hole 16 to inject it.
Can supplement concrete materials more efficiently. On this occasion,
In order to achieve the intended purpose, the pressure of water to be pumped must be as high as 50 to 100 atm, and about 70 atm is preferable.

The concrete material supplied from the injection holes 16 of the ring members 15 of the first and second water supply sections 6 and 7 and mixed therein reaches the spray nozzle 5 from the tip thereof. It is sprayed onto the required construction site (arrow B in Fig. 1).

Therefore, according to this embodiment, since a plurality of water supply portions having ring members are installed separately in the mixing passage for transferring the concrete material, the concrete material to be conveyed in the mixing passage is supplied. It is possible to distribute and supply a liquid amount such as water.

Therefore, the mixing state of the concrete material and the liquid can be improved as compared with the conventional case in which a large amount of liquid is supplied at one time.

Therefore, according to this mixing apparatus, the mixing of the concrete material and the liquid can be improved, and thereby the rebound rate during the spraying work can be improved, so that the material loss in the spraying work can be prevented. .

In the embodiment described above, the injection direction of the injection hole 16 formed in the ring member 15 of each water supply section 6, 7 is formed toward the central axis O of the mixing passage 4.
It can also be implemented as a modification shown in FIG.

In these modifications, the injection holes for injecting water in the directions parallel to each other are formed as a group of injection holes.

In the modification of FIG. 5, the injection hole group P and the injection hole group Q are shown.
And the injection direction is orthogonal to each other. For example, the injection hole group P is formed in the ring member 15 of the first water supply unit 6, and the injection hole is formed in the ring member 15 of the second water supply unit 7. Group Q
Can be carried out.

In the modification of FIG. 6, the angle of intersection between the injection hole group P and the injection hole group Q is made non-orthogonal. In the modification of FIG. 5, the ring member 15 of the first water supply section 6 is used. The injection hole group P in which the injection direction was the vertical direction is attached to the connecting pipe 14 in a right inclined state.

The modification of FIG. 7 is a modification of the modification of FIG. 6 in that an injection hole group R is added as a third injection hole group.

In this case, a third water supply section similar to the first and second water supply sections 6 and 7 is installed, and the injection hole group R is formed in the ring member of the third water supply section. But you can
For example, by forming a plurality of injection hole groups P and Q in a single ring member 15 as shown in FIG. 9, it is possible to carry out in a mixing device having two water supply portions as in the above embodiment.

For example, injection hole groups P and Q are formed in the ring member 15 of the first water supply section 6, and the second water supply section 7 is formed.
The injection hole group R may be formed in the ring member 15.

The modification of FIG. 8 uses four injection hole groups P, Q, R, S having mutually different injection directions.

Therefore, although it can be carried out as a mixing device having four water supply parts corresponding to each injection hole group, it is carried out in the mixing device 1 having two water supply parts 6 and 7 as described above. In that case, two injection hole groups may be formed in each of the ring members 15 of the first water supply unit 6 and the second water supply unit 7 as shown in FIG. 9.

In this case, for example, the ring member 15 of the first water supply unit 6 is formed with injection hole groups P and Q, and the ring member 15 of the second water supply unit 7 is formed with injection hole groups R and S. In that case, it can be implemented.

These modified examples can also achieve the same effects as those of the above-mentioned embodiment.

In the embodiments described above, the direction of water injection from the injection holes 16 is described as being in the plane orthogonal to the central axis O of the mixing passage 4, but the present invention is not limited to this, and the center The state may be non-orthogonal to the axis O, and the water jetted from each jet hole 16 may not be in the same plane.

Further, the case where the injection holes 16 formed in the single ring member 15 constitute a single injection hole group and the case where two injection hole groups are formed have been described. It goes without saying that the holes may be formed.

[0054]

As described above, according to the first aspect of the present invention, since a plurality of water supply portions having ring members are installed in the mixing passage so as to be separated from each other, the concrete transferred in the mixing passage is provided. The amount of liquid such as water to be supplied to the material can be distributed and supplied in plural.

Therefore, as compared with the conventional method in which the total amount of water is added at one place, the material has more opportunities to come into contact with water, which makes it possible to produce a more uniform concrete and to obtain concrete of stable quality. Both rebound and dust can be significantly reduced.

[Brief description of drawings]

FIG. 1 is an overall schematic view of a mixing apparatus according to an embodiment.

FIG. 2 is an enlarged cross-sectional explanatory view of a water supply unit.

FIG. 3 is a central cross-sectional view of FIG.

FIG. 4 is an explanatory diagram of an injection direction by a first water supply section and a second water supply section.

FIG. 5 is an explanatory diagram of a water jet direction in a first modified example.

FIG. 6 is an explanatory diagram of a water jet direction in a second modified example.

FIG. 7 is an explanatory diagram of a water jet direction in a third modified example.

FIG. 8 is an explanatory diagram of a water jet direction in a fourth modified example.

FIG. 9 is a structural explanatory cross-sectional view of a ring member used for carrying out a third or fourth modification.

[Explanation of symbols]

1 mixing device 2 body 3 water supply device 4 mixing passages 6 First water supply 7 Second water supply section 8 high-pressure pump 15 Ring member 16 injection holes

Claims (5)

[Claims] 1. A ring member formed in an annular shape is provided in a mixing passage to which concrete material is supplied from one end, and a large number of injection holes facing the inner surface side are formed in the ring member, and the high-pressure liquid is injected into these injection holes. A dry concrete spraying device that connects a supply source to form a water supply part, supplies liquid from the injection hole to sequentially and continuously mix the concrete material and liquid, and discharges from the other end of the mixing passage. A mixing device for a dry concrete spraying device, characterized in that a plurality of water supply parts are installed separately in the mixing passage. 2. The mixing device for a dry concrete spraying device according to claim 1, wherein the injection hole of the ring member is formed toward the center of the mixing passage. apparatus. 3. The mixing device for a dry concrete spraying device according to claim 1, wherein the injection holes of the ring member are formed in directions parallel to each other in a cross section of the mixing passage. Mixing equipment for concrete spraying equipment. 4. The mixing device for a dry concrete spraying device according to claim 1, wherein the direction of the injection hole in each ring member of the plurality of water supply units is different between the ring members. Mixing equipment for dry concrete spraying equipment. 5. The mixing device for a dry concrete spraying device according to claim 4, wherein the ring members of the plurality of water supply parts have the same shape, and the direction of mounting the plurality of ring members in the mixing passage is set to the mixing passage. Mixing device for dry concrete spraying device, characterized in that they are different from each other in the circumferential direction.