JP2001288751A - Shotcrete machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shotcrete machine for ensuring good execution efficiency and, at the same time, ensuring a homogeneous concrete material when spraying work is carried out by means of the concrete material. SOLUTION: The shotcrete machine receives the concrete material through an inlet pipe from a concrete pump. A screw body 14 extending in the direction of the axis is placed inside of the machine body, and the screw body is driven by a motor 13. A first air supply section 15 for supplying an air is provided at least to the machine body, the concrete material is crushed by the screw body, and it is mixed while conveying it to the direction of a nozzle body by the air supplied from the first air supply section. The concrete material well remixed from a nozzle section 11 for the machine of shotcrete is injected into a spray hose while freely floating it in a spray air. By the constitution, a good spray condition and an air conveying distance can be extended.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pumping apparatus for spraying mortar / concrete material with compressed air, and more particularly to a spraying machine used for a pumping apparatus used in civil engineering works and the like.

[0002]

2. Description of the Related Art In general, when performing slope spraying work at a civil engineering work site or the like, a pumping device using a concrete pump is used. This pumping device includes a spraying machine (concrete pump) and a spraying nozzle, and the spraying nozzle is attached to a tip of a transfer hose extending from the spraying machine. In such a pumping device, a mortar / concrete material (hereinafter simply referred to as a concrete material) is supplied to a spraying machine, and this concrete material is pressure-fed from the spraying machine to the spraying nozzle by using compressed air, and is compressed from the spraying nozzle by the compressed air. It is sprayed on the construction site.

[0003]

By the way, when a concrete material is transported by a concrete pump over a long distance, for example, to a high place, it is necessary to reduce the pumping resistance and to prevent the concrete material from separating / blocking. Therefore, it is necessary to ensure the fluidity of the concrete, and therefore, a thickening agent and the like are added in order to enrich the concrete material and further increase the separation resistance. As a result, the concrete material becomes extremely sticky, and may adhere to the inner wall of the hose when the concrete material is air-conveyed by the conveyance hose.

[0004] In addition, during high-altitude and long-distance transportation, in high-pressure pumping, the paste is pushed out from the center and tends to gather around the inflow pipe. Becomes less and becomes a pillar of sand.
In such a state, when air is blown in, the paste and the sand are separated and the air is conveyed in a separated state, and the paste adheres and accumulates on the inner wall of the hose, causing a clogging state.
When the pumping is performed, a so-called gun phenomenon in which the concrete material is suddenly blown out may occur.

Further, only the sand is blown off, and the poorly-mixed portion with a low cement content and the rich portion with a large amount of paste are alternately blown out. There is also a problem that it cannot be obtained.

As described above, in the conventional pumping apparatus, not only the workability is remarkably deteriorated, but also it is difficult to secure uniform quality due to material separation.

[0007] In particular, when working at a height of 160 to 200 meters, the above-mentioned problems become remarkable, and the central portion of the concrete material may become so-called dehydrated due to increased sand content. As a result, air conveyance becomes extremely difficult.

[0008] An object of the present invention is to provide a spraying machine that can ensure good workability (air transportability of material).

Another object of the present invention is to provide a spraying machine which can ensure uniform quality.

[0010]

According to the present invention, there is provided a spraying machine for receiving a concrete material from a concrete pump via an inflow pipe, and spraying and blowing the concrete material. A spraying machine main body, a stirring means disposed in the spraying machine main body, for stirring the concrete material, and a nozzle body attached to the spraying machine main body and jetting out the concrete material. A spraying machine is provided in which a first air feeding section for feeding air into the spraying machine main body is provided.

[0011] For example, the spraying machine main body is a tubular body, and the agitating means includes a screw body disposed in the tubular body along an axis of the tubular body, and the screw body is rotated by a motor. Driven.

The motor is attached to the sprayer body, for example, and is connected to the screw body via a gear mechanism having a predetermined gear ratio.

[0013] Further, the transfer hose is connected to the spraying machine main body, and is separated from the connecting portion between the transfer hose and the spraying machine main body at an upstream side by the first spraying machine main body. Is formed, and the nozzle body is provided with a second air feeding section for feeding air.

The nozzle body may have a plurality of nozzle portions. In this case, the second air inlet is formed in each of the nozzle portions. The nozzle body is detachably mounted on the spraying machine body. It is desirable that the diameter of the inflow pipe near the spraying machine main body be increased by a predetermined size.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments.

Referring to FIG. 1, a first example of the spraying machine according to the present invention will be described. The illustrated blowing machine (air blowing pipe) is used together with a pressure feeding device (not shown). The pumping device includes a concrete pump 10 and an inflow pipe (concrete conveying pipe) extending from the concrete pump.
21 and the spraying machine is mounted at the tip of the inflow pipe. The spraying machine is provided with a spraying machine nozzle portion (nozzle body) 11.

As shown in the figure, the spraying machine has a main pipe section (spraying machine main body) 12, and a motor 13 is attached to one end (left end in the figure) of the main pipe section 12. The motor 12 is provided with a gear mechanism (not shown) having a predetermined gear ratio (for example, 1/15). A screw body 14 is attached to the motor 13 via the gear mechanism. Reference numeral 14 extends into the main pipe portion 12. The motor 13 is, for example, 0.75 kW,
It has an output of 00 rpm-110 kg-cm. When the motor 13 rotates, the screw body 14 is driven to rotate via the gear mechanism. At this time, the blade tip force of the screw body 14 is 20 kg.

An inflow pipe 21 is attached to a side surface of the main pipe section 12. The inflow pipe 21 is formed with a bent section 21a to be attached to the main pipe section 12. The bent section 21a extends from the bent section 21a. The diameter of the inflow pipe 21 is increased up to the mounting portion with the inflow pipe 12. Thereby, the concrete material pumped through the inflow pipe 21 can be easily released from the restraint at the bent portion 21a and bent.

A first air inlet 15 is formed in the main pipe portion 12 in the motor 13 rather than in the above-described mounting portion. The sprayer nozzle 11 described above is attached to the tip of the main pipe 12. The sprayer nozzle 11 has a double structure as shown in the drawing.
It has an acceleration nozzle section 11a and an ejection nozzle section 11b. That is, the acceleration nozzle portion 11a is joined to the main pipe portion 12, and the ejection nozzle portion 11b is attached to the acceleration nozzle portion 11a so as to cover the acceleration nozzle portion 11a.

The ejection nozzle portion 11b and the acceleration nozzle portion 11a
As a result, a space (gap) communicating with the tip of the ejection nozzle portion 11b is formed between the inner peripheral surface of the ejection nozzle portion 11b and the outer peripheral surface of the acceleration nozzle portion 11a. You. A second air inlet 16 is formed on the side surface of the ejection nozzle portion 11a corresponding to this space. As shown in FIG. 1, a blowing hose 22 is connected to the ejection nozzle portion 11b.
A spray nozzle 23 is attached to the tip of 2 and spraying work is performed as described later.

For example, when spraying is performed on a slope using the above-described spraying machine, the concrete pump 10 is driven to pump the concrete material into the inflow pipe 21 (for example, at a rate of 4 cubic meters / hour). The pressure resistance of the inflow pipe is, for example, 130 kgf / cm 2, the length is 300 to 400 meters, and the height is 1
60 to 200 meters). As described above, since the bent portion 21a is formed in the inflow pipe 21, the concrete material pumped through the inflow pipe 21 can easily be bent.
It can be easily bent by releasing the constraint in 1a.

As described above, the concrete material is pumped and the motor 13 is rotated. Thus, the screw body 14 is driven to rotate. Further, air (primary air) is blown from the first air inlet 15 using a compressor or the like, and air (secondary air) is blown from the second air inlet 16.

The concrete material sent from the inflow pipe 21 to the main pipe portion 12 is first sent to the tip of the main pipe portion 12 together with the primary air while being crushed and coarsened by the screw body 14. At this time, the paste collected on the inner periphery of the inflow pipe 21, that is, the paste collected outside the center of the concrete material is diffused. Further, the concrete material is kneaded by the screw body 14 while being sent toward the tip of the main pipe portion 12. That is, the once dispersed paste is mixed again.

The concrete material sent to the tip of the main pipe section 12 is sent to the sprayer nozzle section 11 and is ejected from the ejection nozzle section 11b together with air (secondary air) sent from the second air inlet 16. Is done. Then, the concrete material ejected from the ejection nozzle portion 11b reaches the spray nozzle 23 via the spray hose 22, and the concrete material is sprayed from the spray nozzle 23 onto the slope or the like.

As described above, the bent portion 21a is formed in the inflow pipe 21.
Is formed, and since the screw body 14 is provided in the spraying machine and the primary and secondary air are supplied, that is, the concrete material is once crushed and coarsened, and the concrete material is suspended by the primary air. Further, the paste is once diffused. Then, the concrete material is kneaded again, accelerated by secondary air, and sprayed by the sprayer nozzle 11.
Therefore, the quality of the concrete material can be homogenized regardless of the properties of the concrete material. In addition, since the primary and secondary air are supplied, the transportability of the concrete material is improved, and the pulsation of the concrete pump 10 can be absorbed.

Referring to FIG. 2, a second example of the spraying machine according to the present invention will be described. In the illustrated example, the same components as those of the spraying machine shown in FIG. 1 are denoted by the same reference numerals.

In the illustrated spraying machine, a spraying machine nozzle 31 is provided in place of the spraying machine nozzle 11 shown in FIG. 1, and the spraying machine nozzle 31 is formed in two branches. That is, the sprayer nozzle unit 31 includes the first acceleration nozzle unit 32a and the second acceleration nozzle unit 32b, and these first and second acceleration nozzle units 32a and 32b are provided.
b is connected at one end (the left end in the figure). In this joint, the first and second acceleration nozzles 32 a and 32 b are attached to the tip of the main pipe 12.

First and second acceleration nozzle sections 32a and 32
2b includes a first and a second acceleration nozzle 32a, respectively.
And 32b are covered with the first and second ejection nozzle portions 33a and 33b (ie,
First acceleration nozzle section 32a and first ejection nozzle section 33a
Constitute a first nozzle portion, and the second acceleration nozzle portion 32b and the second ejection nozzle portion 33b form a second nozzle portion.
Nozzle portion is configured). The attachment portion between the first ejection nozzle portion 33a and the first acceleration nozzle portion 32a is closed. As a result, the inner peripheral surface of the first ejection nozzle portion 33a and the first acceleration nozzle portion 32a are closed. A space (gap) is formed between the outer peripheral surface and the front end of the first ejection nozzle portion 33a.

Similarly, the attachment portion between the second ejection nozzle portion 33b and the second acceleration nozzle portion 32b is closed,
The second ejection nozzle portion 33 is provided between the inner peripheral surface of the second ejection nozzle portion 33b and the outer peripheral surface of the second acceleration nozzle portion 32b.
A space (gap) leading to the tip of b is formed. Further, second and third air inlets 34 and 35 are formed on side surfaces of the first and second ejection nozzle portions 33a and 33b, respectively. Although not shown, a spraying hose is connected to each of the first and second ejection nozzle portions 33a and 33b, and a spraying nozzle is attached to a tip of each of the spraying hoses.

[0030] Even if the above-mentioned spraying machine nozzle part 31 is used,
Although the same effects as those of the spraying machine shown in FIG. 1 can be obtained, the use of the spraying machine nozzle section 31 can increase the amount of concrete material conveyed by the inflow pipe 21 (pressing amount). The first and second ejection nozzle portions 33a and 33
The amount of concrete material ejected from each of b is between 3 and 4.0 cubic meters / hour.

The sprayer nozzle 11 shown in FIGS. 1 and 2
And 31 are prepared, it is possible to replace the spraying machine nozzle part as needed, and it is possible to appropriately cope with the case where a large amount of concrete material is ejected.

It should be noted that the number of jets of the sprayer nozzle is not limited to one or two, but can be increased or decreased as needed. That is, three or more ejection parts may be provided.

[0033]

As described above, according to the present invention, the screw is provided in the spraying machine and the primary and secondary air are supplied, that is, the concrete material is once pulverized and coarsened. Then, the concrete material is suspended by the primary air, the paste is diffused, the concrete material is kneaded again, and the concrete material is ejected from the spray nozzle 11 together with the secondary air. This also has the effect that the quality of the concrete material can be homogenized.

Furthermore, since the primary and secondary air are inserted, the transportability of the concrete material in the spray hose is improved, so that a good spray state and the air transport distance can be extended.

As described above, according to the present invention, there is an effect that a good workability can be ensured and a uniform quality of the concrete material can be ensured.

[Brief description of the drawings]

FIG. 1 is a view showing a first example of a spraying machine according to the present invention.

FIG. 2 is a view showing a second example of the spraying machine according to the present invention.

[Explanation of symbols]

  11, 31 Sprayer nozzle part 12 Main pipe part 13 Motor 14 Screw body 15, 16, 34, 35 Air inlet 21 Inflow pipe 22 Blowing hose 23 Blowing nozzle

Continued on the front page (72) Inventor Mitsuo Kawakami 4505-1 Washizuku, Kitsuregawa-cho, Shioya-gun, Tochigi Pref. Toko Construction Co., Ltd. 1 Toko Construction Corporation Technical Center F term (reference) 2D044 DC05 3F040 BA01 DA01 DA07 3F047 BA02 4D067 CB01 CB08 GA05 GB03 4F033 QA08 QB02Y QB09X QB12Y QB20 QD03 QD06 QF03X QF07Y QF15Y QF17Y

Claims (12)

[Claims] 1. A spraying machine used for receiving a concrete material from a concrete pump via an inflow pipe and jetting and spraying the concrete material, comprising: a spraying machine main body for receiving the concrete material; A stirrer is disposed within the spraying machine main body and stirs the concrete material, and has a nozzle body attached to the spraying machine main body and jetting the concrete material, and at least air is supplied to the spraying machine main body. A spraying machine having a first air inlet. 2. A spraying machine according to claim 1, wherein said spraying machine main body is a tubular body, and said stirring means comprises a screw body disposed in said tubular body along an axis of said tubular body.
The spraying machine described. 3. The spraying machine according to claim 2, wherein said stirring means further comprises a motor for driving said screw body to rotate. 4. The screw body is characterized in that the concrete material is crushed and kneaded while being conveyed in the direction of the nozzle body by air supplied from the first air supply unit. The spraying machine according to claim 2 or 3, wherein 5. The spraying machine according to claim 3, wherein the motor is attached to the spraying machine main body. 6. The spraying machine according to claim 3, wherein the motor is connected to the screw body via a gear mechanism having a predetermined gear ratio. 7. The inflow pipe is connected to the main body of the spraying machine, and the first side of the main body of the spraying machine is separated from the connecting portion between the inflow pipe and the main body of the spraying machine at an upstream side. The spraying machine according to any one of claims 1 to 6, wherein an air feeding portion is formed. 8. A second nozzle for supplying air to the nozzle body.
The spraying machine according to any one of claims 1 to 7, further comprising: 9. The blowing device according to claim 8, wherein the nozzle body has a plurality of nozzle portions, and each of the nozzle portions is provided with the second air supply portion. Attaching machine. 10. The spraying machine according to claim 8, wherein the nozzle body has first and second nozzle portions. 11. The spraying machine according to claim 1, wherein the nozzle body is detachably mounted on the spraying machine main body. 12. The spraying machine according to claim 1, wherein a diameter of the inflow pipe near the spraying machine main body is increased by a predetermined size.