JP2564434B2 - Mixing equipment for dry concrete spraying equipment - Google Patents

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.

Further, in such a conventional device, each water
Water supplied from the injection hole concentrates toward the center of the mixing passage
Water curtain that sprays water from the water and spreads from each water injection hole
Since it was to be sprayed in a shape of,
It is difficult to supply water evenly to each part.
And partial concrete material is to be mixed with the excessive amount of water obtained I, contacting only too small amounts of water in the opposite, occurred and not mixed portion is unstable water-cement ratio of the produced concrete It was unavoidable.

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. manner in the mixing mixing device for dry concrete spraying apparatus that is discharged from the other end of said mixing passage, performing the mixing passage, together with the installed apart a plurality of water supply, the water supply
Each injection hole of the ring member in the section is a cross section of the mixing passage.
It is formed toward a direction parallel to each other in each
Direction of injection hole in each ring member of water supply section
It is characterized in that the directions of the ring members are different 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. You can

Moreover, according to the present invention,
Each injection hole of the ring member in the cross section of the mixing passage is
Are formed in parallel with each other, and each water supply
Direction of the injection hole in each ring member of the
The ring members are different from each other.

Therefore, the concrete transferred in the mixing passage is
For the coating material, from the injection hole of each ring member
The liquid forms a grid in the cross section of the mixing passage,
Water supply by passing concrete material through the body grid
Therefore, the concrete material transferred through the mixing passage
Water can be evenly distributed over the entire cross section of the mixing passage.
Therefore, it is possible to obtain homogeneous and stable concrete.
Wear.

As described above, a concrete that is homogeneous and has stable quality
Spraying work of concrete as it is possible to obtain
In the above, both rebound and dust can be significantly reduced.

[0015]

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 main body 2
And a water supply device 3.

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

As shown by an arrow A, a concrete material for 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.

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 first water supply section 6 and the second water supply section 7 have substantially the same structure. Therefore, the first water supply section 6 will be described below with reference to FIGS. 2 and 3. Regarding the second water supply unit 7, only the differences will be described.
It

That is, the first water supply unit 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, there are four injection holes 16 (injection) which communicate between the inner and outer surfaces of the ring member 15.
A group of holes P) are arranged and bored in a plane orthogonal to the central axis O of the mixing passage 4.

In the case of this embodiment, the injection hole group P is constructed.
These jet holes 16 are those which are parallel drilled downwards from each other.

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 into the annular groove 17.
There is communicated, water passing through the pipe 11 is supplied to the Ki噴 Iana 16 before through the annular groove 17, and injected toward the lower portion of the mixing passage 4 of these injection holes 16, it is transported to mixing passage 4 It is designed to supply water to concrete materials.

On the other hand, in the second water supply section 7, the ring
Each injection hole 16 (e.g., injection hole group Q) formed in the member 15
The direction of injection is different from the above, and the injection hole group Q is
The injection hole group P and its injection direction are orthogonal to each other.
It

In FIG. 4, the solid line indicates the injection direction by the injection hole group P of the ring member 15 of the first water supply section 6, and the phantom line the injection by the injection hole group Q of the ring member 15 of the second water supply section 7. If the two ring members 15 are unitary, they have 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 section 7 is rotated and displaced by 90 degrees in the circumferential direction with respect to the ring member 15 of the first water supply section 6, and the second water supply section is provided. It is attached to the connecting pipe 4 of the part 7.

Therefore, the directions of water injection from the 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.
Is different from that in the cross section of the mixing passage 4.
An orthogonal grid is formed by the jet water .

Therefore, the concrete material transferred in the mixing passage 4 has a cross section from the grid of the above-mentioned water jet.
There is an advantage in that a homogeneously mixed concrete material can be obtained by dispersing and supplying water throughout the whole .

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 into the concrete material in the mixing passage 4 from the injection holes 16 of the injection hole group P formed in the ring member 15 of the first water supply unit 6 .

The diameter of these injection holes 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 respective 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.

Further , as described above, the first and second water supplies
By the injection holes P and Q installed in the parts 6 and 7,
Since a grid is formed in the cross section of the mixing passage 4,
Equal to the entire cross section of the concrete material transferred through the passage 4.
Can be supplied to.

Therefore, according to this mixing device, the mixing of the concrete material and the liquid can be improved, and thereby the rebound rate at the time of spraying work is also improved, so that the material loss in spraying work can be prevented. .

[0042] In the embodiment described above, it is assumed that orthogonalizing in the cross section of the mixing passage 4 the injection direction of the injection hole 16 formed in the ring member 15 of the water supply unit 6, 5-7 It can also be implemented as a modification shown in FIG.

Also in these modified examples, the injection holes for injecting water in the directions parallel to each other are a group of injection holes .

In the modified example of FIG . 5 , the intersection angle between the injection hole group P and the injection hole group Q is set to a non-orthogonal state .
In the embodiment, the ring member 15 of the first water supply unit 6 is attached to the connecting pipe 14 with the injection hole group P whose injection direction is the vertical direction being inclined rightward.

The modification of FIG. 6 is a modification of the modification of FIG. 5 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. 8 , it is possible to carry out in a mixing device having two water supply portions as in the above-described 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. 7 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 this case, each of the ring member 15 of the first water supply unit 6 and the second water supply unit 7 may be the forming of each of the two injection hole group as shown in FIG.

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. You can

Moreover, according to the present invention, each water supply unit
Each injection hole of the ring member in the cross section of the mixing passage is
Are formed in parallel with each other, and each water supply
Direction of the injection hole in each ring member of the
The ring members are different from each other.

Therefore, the concrete transferred in the mixing passage is
For the coating material, from the injection hole of each ring member
The liquid forms a grid in the cross section of the mixing passage,
Water supply by passing concrete material through the body grid
Therefore, the concrete material transferred through the mixing passage
Water can be evenly distributed over the entire cross section of the mixing passage.
Therefore, it is possible to obtain homogeneous and stable concrete.
Wear.

As described above, the concrete which is homogeneous and has stable quality
Spraying work of concrete as it is possible to obtain
In the above, 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 sectional view of FIG. 2;

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 a cross-sectional view illustrating the structure of a ring member used for implementing the second or third modification.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mixing device 2 Main body 3 Water supply device 4 Mixing passage 6 1st water supply part 7 2nd water supply part 8 High pressure pump 15 Ring member 16 Injection hole

Claims (2)

(57) [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. In the mixing device for use in the mixing passage, a plurality of water supply units are installed separately from each other.
In both cases , the injection holes of the ring member in each water supply unit are
Formed parallel to each other in the cross section of the mixing passage
And the orientation of the injection holes in each ring member of each water supply section.
A mixing device for a dry concrete spraying device, characterized in that the directions of the ring members are different from each other . 2. The mixing device for a dry concrete spraying device according to claim 1 , wherein the ring members of the plurality of water supply units 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.