JP2000356097A - Projection type spray gun for concrete and the like - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the need for cleaning concrete or the like mixed with an accelerating agent, at the time of interruption or completion of spraying work. SOLUTION: In this projection type spray gun, a material storage part 15 comprises a pair of rotating plates 1, 1 supported in such a way as to be capable of rotating about the same axis, and an endless belt 6 wound on both rotating plates 1, 1a, and concrete M1 or the like and an accelerating agent M2 supplied to the material storage part 15 are released at the outwardly advancing part 6a at an open position of the endless belt 6 driven for circulation. A concrete supply pipe 16 and an accelerating agent supply pipe 17 are passed through the centers of the rotating plates 1a, 1a and the concrete M1 or the like and the accelerating agent M2 are supplied into the material storage part 15 from the ends of both supply pipes 16, 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete projecting method which is used when concrete is mixed with a quick-setting admixture and sprayed onto the inner wall of a tunnel, the wall or floor of a building or the slope of the ground. It relates to the improvement of a spray gun. In the description, "concrete" is used to mean a hydrated mixture of cement such as concrete and mortar.

[0002]

2. Description of the Related Art As a conventional concrete-type spraying machine of this type, there is the one shown schematically in FIG. Further, those which have been applied for patents by the present applicants and which have already been published as JP-A-5-125835 and JP-A-7-180496 can be cited as equivalent to the projection type spraying machine of FIG.

The projection type spraying machine shown in FIG. 7 has a pair of rotary plates 9 supported by a material supply outer cylinder 92 of a material supply device 91 so as to be able to rotate around the same axis at a predetermined interval.
5, 95 and an endless belt 96 wound around both rotating plates 95, 95 constitute a material storage section 97.
The concretes M1 and the quick-setting agent M2, which are mixed in advance and supplied to the material container 97, are supplied to the endless belt 96 at an open position where the endless belt 96 that is circulated is separated from the pair of rotating plates 95, 95. The release is performed along a portion (not shown) that proceeds outward.

The material supply device 91 has a material supply outer cylinder 92 having a front end portion opened into the material storage portion 97 and a rear end portion connected to a concrete supply pipe 98 and a quick-setting agent supply pipe 99. , A screw conveyor 93 rotatably mounted in the outer cylinder 92, and a conveyor driving device 94 for driving the screw conveyor 93 to rotate.
7, reference numeral 100 denotes one of a plurality of pulleys around which an endless belt 96 is wound together with a rotary plate 95, and 101 denotes a pulley driving device such as a motor for driving the pulley 100.

[0005] According to such a conventional concrete-type spraying machine, the quick-setting admixture and the concrete are mixed during rotation and transport in the screw conveyor 93, and then the concrete is stored in the material accommodating section 97. Sent to Concrete mixed in this way is stored in the material storage section 97.
Endless belt 96 which is rotated by acceleration blades and driven at high speed
Is projected and sprayed by causing the outer running part to adhere to the belt by centrifugal force. This belt-type spraying method achieves the effect of reducing scattering of powder and improving the environment of the work site.

[0006]

However, in the conventional belt-type spraying method, the quick-setting agent and concrete are mixed during rotation and transport in the screw conveyor, so that the spraying operation is interrupted or terminated. At this time, the concrete remaining on the screw conveyor rapidly solidifies. For this reason, in the conventional method, every time the operation of the spraying machine is stopped, it is necessary to disassemble and clean (wash) the inside of the screw conveyor near the outlet of the quickening agent. If this is not done, the concrete will solidify in minutes and the sprayer will not be reusable. For this reason, a large amount of time and labor was required for disassembly and cleaning. This was also a nervous job.

Therefore, the concrete type spraying machine according to the present invention makes it possible to hardly clean the mixture of concrete and quick-setting agent remaining in the spraying machine when the spraying operation is interrupted or terminated. It has been proposed for the purpose of doing so.

[0008]

Means for Solving the Problems To achieve the above object, a concrete type spraying machine according to the present invention is constructed as follows. According to a first aspect of the present invention, a material accommodating portion is constituted by a pair of rotating plates supported so as to be rotatable around the same axis at a predetermined interval, and an endless belt wound around both rotating plates. The concretes and quick-setting agent supplied to the storage section are discharged at an open position where the endless belt driven by circulation is separated from the rotary plate at an outwardly traveling portion of the endless belt. In a spraying machine, a configuration in which concrete and quick-setting agent are individually supplied into a material storage unit from a concrete-type supply pipe and a quick-setting agent supply pipe communicating with the opening through an opening provided in the center of the rotary plate. It is characterized by having. According to a second aspect of the present invention, in the first aspect of the present invention, the openings are provided so as to be located substantially on the center axes of the two rotating plates, respectively, and a leading end opening of the concrete supply pipe and a leading end opening of the quick setting agent supply pipe are provided. It is characterized by being arranged oppositely. According to a third aspect of the present invention, in the first or the second aspect of the present invention, an accelerating blade having a function of intermittently accelerating the concrete and the quick-setting agent and having a function of mixing both materials is provided between the two rotating plates. It is characterized by having. The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the two rotating plates are connected by an acceleration blade and a connecting member or any one of them, and one of the two rotating plates is connected to the concrete or the like. One of the material supply pipes of the quick-setting agent is a fixed hollow shaft, and the material supply pipe is cantilevered by a non-contact type swivel portion having a small gap formed in the shaft support portion, and becomes the fixed hollow shaft. A little bit into the opening of the tip of the slab, and by rotating integrally with the rotating plate, the concrete or the quick-setting agent is diffused to give a centrifugal force thereto, and the first function having a function of keeping the material container at a negative pressure. And the second rotating blades are arranged concentrically with the fixed hollow shaft. According to a fifth aspect of the present invention, in the invention of the fourth aspect, the fixed hollow shaft of the cantilevered rotating plate is a quick-setting agent supply pipe, and a concrete supply pipe located opposite to the quick-setting agent supply pipe. The tip has a function of maintaining the material container at a negative pressure while diffusing the concrete extruded from the supply pipe by rotating integrally with the rotary plate and imparting a centrifugal force to the concrete. The second rotating blade is concentrically arranged with the concrete supply pipe. According to a sixth aspect of the present invention, in the invention of the fourth aspect, the fixed hollow shaft of the cantilevered rotating plate is a quick-setting agent supply pipe, and the inner surface of the rotary plate on the side of the quick-setting agent supply pipe on the material storage portion side. A passage communicating with a leading end opening of the quick-setting agent supply pipe and discharging the quick-setting agent whose movement has been changed in the direction perpendicular to the axis by the first rotary blade to a discharge port located at a fixed distance from the axis; Are provided radially.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment shown in the drawings. 1 to 6,
Reference numerals 1 and 1a denote a pair of circular rotary plates that can rotate around the same axis at a predetermined interval.
1a is supported by one of the pair of support frames 3 and 3a (the left support frame in FIG. 1) 3, for example, on the same central axis.

More specifically, the two rotating plates 1 and 1a in the illustrated example are connected to each other by a plurality of acceleration blades 2 and / or a connecting member (not shown). Of the other support frame 3 via a swivel portion 35 composed of a hollow shaft 4 and a bearing 5 projecting outwardly in the axial direction from the rotating plate).

The rotating plates 1 and 1a have a cantilever structure.
The tip opening 16a of the concrete supply pipe 16 and the tip opening 17a of the quick-setting agent supply pipe 17 to be described later are concentrically positioned substantially on the rotation center axis of the rotary plate 1, or the rotary plate 1 has When the second rotating blades 20 and 21 are provided,
Alternatively, this is because design is advantageous in the case where a later-described dispersion passage 21 is provided in communication with the tip opening 17a of the quick-setting agent supply pipe 17.

The rotating plates 1 and 1a may have a double-supported structure, and although not necessarily preferable in terms of strength, the rotating plates 1 and 1a need not be connected to each other.

An endless belt 6 made of a rubber-like elastic material or the like is wound around the pair of rotary plates 1 and 1a, and the endless belt 6 is further disposed around the rotary plates 1 and 1a. ), And are formed, for example, in a concave-shaped loop when viewed from the front side or the rear side so as to be circulated.

In FIG. 1, reference numeral 32 denotes a ridge provided integrally on the contact surface of the endless belt 6 with all the pulleys 7 over the entire circumference. The ridge 32 is an annular member provided on the outer periphery of each pulley 7. The endless belt 6 is fitted into the groove 33 to constitute a deviation preventing means 34 for the endless belt 6.

The center axes of rotation of the plurality of pulleys 7 are all parallel to the center axes of rotation of the rotary plates 1 and 1a. Of the four pulleys 7, three Separately, a rotating shaft 8 is fixedly provided, each rotating shaft 8 is rotatably supported by a support frame 3, 3a via a bearing 9, and another pulley 7 is attached to the support frame 3, 3a. A non-rotating shaft 12 is rotatably supported via a bearing 11. At least one of the rotating shafts 8 is coupled to an output shaft of a driving device 10 such as a motor provided on one of the support frames 3, and the pulley 7 integrated with the rotating shaft 8 acts as a drive pulley to drive the endless belt 6. Is circulated. Between the non-rotating shaft 12 and the flange portions 13, 13 of the support frames 3, 3a, there are provided well-known take-up means 14, 14 composed of a set of bolts and nuts.
The pulley 7 of the non-rotating shaft 12 removes slack from the endless belt 6 and applies an appropriate tension to the endless belt 6.

Further, a material container 15 is constituted by the pair of rotary plates 1 and 1a and a part of the endless belt 6 wound therearound, and the concrete M1 supplied to the material container 15 and the quick setting The agent M2 is stirred and mixed there, and then the endless belt 6 driven to circulate is separated from the pair of rotary plates 1 and 1a in a tangential direction at an open position.
Can be emitted and projected along the outwardly traveling portion 6a (outward traveling portion). 2 and 4, reference numeral 30 denotes a guide member having a triangular cross section, for example, which is bridged between the pair of support frames 3 and 3a at the open position of the endless belt 6, and concrete discharged from the material storage portion 15. The projection direction of the mixture of the class M1 and the quick setting agent M2 is appropriately regulated.

Next, the main part of the present invention will be described.
In the present invention, as shown in the figure, the concrete supply pipe 16 is made to penetrate the center part (near the rotation center axis) of the right rotating plate 1 in the figure, and the quick setting agent supply pipe 17 is passed through the left rotating plate 1 in the figure. At the center (near the center of rotation), and the ends of both supply pipes 16 and 17 are connected to a pair of rotating plates 1 and 1a.
The openings 16a and 17a are separately formed in the material storage section 15 formed by the endless belt 6. Although not shown, both supply pipes 16 and 17 may be configured to pass through the center of one rotating plate 1.

In the illustrated example, a concrete supply pipe 1 is shown.
Reference numeral 6 denotes a rotary plate which is inserted and supported so as to be relatively rotatable with respect to the receiving cylinder portion 3c of the one support frame 3a, and the tip of which is normally rotated at a high speed of about 1200 rpm. 1a is passed through the gap 36 in a non-contact state. The quick-setting agent supply pipe 17 connected to the end of the connection pipe 19 is fixed to the receiving cylinder part 3b of the other support frame 3 by a bolt 38 via a flange 3d by a flange 17b provided at the base thereof. The leading end of the rotary plate 1 is penetrated through the hollow shaft 4 of the other rotary plate 1 via a gap 37 in a non-contact state.

In FIG. 1, reference numeral 18 denotes a concrete supply pipe 1.
Reference numeral 6 denotes a connection pipe such as a hose connected to the base end of the connection pipe, and reference numeral 19 denotes the connection pipe such as a hose connected to the base end of the quick-setting agent supply pipe 17.

Between the pair of rotary plates 1 and 1a, a function of stirring and mixing the concretes M1 and the quick-setting agent M2 separately supplied into the material storage portion 15 and / or the concretes M1 after the stirring and mixing. A plurality of acceleration blades 2 having a centrifugal force imparting function for pushing the quick-setting agent M2 outward from the material storage portion 15 may be provided.

The plurality of acceleration blades 2 shown in the figure are fixed at both ends to the rotary plates 1 and 1a by welding or the like, and are arranged radially with respect to the rotary plate 1 as shown in FIG. I have. In addition, the acceleration blades 2 are arranged so as to form a plurality of sets (four sets of 2a, 2b, 2c, and 2d in order from inside to outside) at different distances in the radial direction from the rotation center of the rotary plate 1. The plurality of acceleration blades 2 of each set 2a, 2b, 2c or 2d are arranged at equal intervals in the circumferential direction.

Further, a pair of radially adjacent acceleration blades 2
a and 2b, 2b and 2c or 2c and 2d
Since the mounting position with respect to the mounting plate 1a is angularly shifted with respect to the rotation center axis of the rotating plate 1 so as to leave a gap therebetween, a series of blade plates (2a, 2b) lined from the inside to the outside. , 2c and 2d) or (2c and 2d) will be matrixed with steps.

When the two rotating plates 1 and 1a are connected as described above, the acceleration blade 2 having both ends fixed to the two rotating plates 1 and 1a, respectively, is a connecting member for connecting the two rotating plates 1 and 1a. (Not shown),
The exclusive connecting member can be omitted.

When the distance between the two rotating plates 1 and 1a is relatively small, the two rotating plates 1 and 1a do not have to be connected to each other. It can be fixed on the inner surface and cantilevered.

All of the acceleration blades 2 shown in FIG. 4 mainly serve to stir and mix the concretes M1 and the quick-setting agent M2 separately supplied into the material accommodating section 15, and also serve to stir and mix these materials in the material accommodating section 15. Endless belt 6 for M1 and M2
It also serves as a secondary function in support of the feed pressure, centrifugal force and gravity of the material itself which is moved towards the inner surface of the body.
In addition to the functions (roles) described above, the accelerating blades 2d at the outer peripheral portion are provided with the mixed materials M1 and M mixed with the endless belt 6.
2 serves to push out the outer running portion 6a of the endless belt 6 which is tangentially separated from the rotating plates 1 and 1a.

Next, referring to FIGS. 1 and 3 to 6, the rotating blades 20 and 21 provided on one of the rotary plates 1 and the dispersion passage 24 provided facing the tip opening 17 a of the quick-setting agent supply pipe 17. Is described.

A first rotary blade 20 and a second rotary blade 21 each having four blade plates assembled in a cross shape are integrally formed with a mounting plate portion 22 interposed therebetween from the front and rear. The front end opening 17a of the quick-setting agent supply pipe 17 and the front end opening 16a of the concrete supply pipe 16 which are concentrically arranged substantially on the center axes of the plates 1 and 1a are respectively opposed to each other and slightly enter each opening. One of the rotary plates 1 is attached to the inner surface of the material accommodating portion 15 side by the bolt 31 or the like via the attachment plate portion 22.

Therefore, the first and second rotating blades 20, 2
1 rotates together with one rotary plate 1 to which each is attached, and the first rotary blade 20 is connected to the opening 1 of the quick-setting agent supply pipe 17.
Quick-setting agent M supplied to the center of the material storage section 15 from 7a
2 can be quickly applied with a centrifugal force and easily diffused in the radial direction, and the quick-setting agent M2 can hardly enter the gap 37.

As described above, the second rotary blade 21 rapidly applies a centrifugal force to the concrete M1 supplied to the center of the material storage portion 15 from the opening 16a of the concrete supply pipe 16, and diffuses radially. Can be made easier and the gap 3
The concrete M1 can hardly penetrate into 6. By providing the first and second rotary blades 20 and 21 in this manner, the respective materials M1 and M1 in the material storage portion 15 are provided.
This is where the diffusion performance of M2 is further enhanced. However, the first
Alternatively, only one of the second rotating blades 20 and 21 may be provided.

A plurality (four in the figure) of the one rotating plate 1 is provided on the inner surface of the material accommodating section 15 side so that the powdery quick-setting agent can be supplied without any problem even if the supply pressure is low. 4) are radially provided. The base end of the dispersion passage 23 communicates with the distal end opening 17a of the quick-setting agent supply pipe 17 located substantially on the center axis of the rotary plate 1, and the tip of the dispersion passage 23 is moved by the second rotary blade 21. Changed accelerator M
2 is communicated with a discharge port 23a for discharging the concrete 2 to a position at a fixed distance from the shaft center, that is, a position where the concrete M1 is brought into a negative pressure state by a rotational motion. The dispersion passage 23 in the illustrated example
Cuts a plurality of grooves on the inner surface of the thickened central portion of one of the rotating plates 1 and inserts the grooves into the rotating blades 20, 21.
Are formed and sealed by the mounting plate portion 22.

The following effects are achieved by the dispersion passage 23 and the discharge port 23a. In other words, most of the inside of the material storage section 15 is concrete M1, which is pumped by a strong pump. When the quick-setting agent M2 supplied at a low pressure meets this, the pressure of the concrete M1 wins. The setting agent M2 is not supplied stably. However, in the vicinity of the discharge port 23a at the tip of the dispersion passage 23 located at a certain distance from the axis, the concrete M1 is in a negative pressure state due to the rotational motion.
In the vicinity of the quick-setting agent M2 that is released with sufficient centrifugal force applied from a, the pressure of the quick-setting agent M2 is ensured to be equal to or higher than that of the concrete M1 and can be released stably.

A mounting projection 24 is provided below the base end of the concrete supply pipe 16 to which a boom (not shown) of a working vehicle (not shown) is connected, and the entire spraying machine of the present invention is supported. Is done. Also, concrete supply pipe 1
6 is provided with a mounting plate 25 at the base end, to which a driving device 26 such as a motor is fixed.

The driving device 26 is fixedly provided around a driving gear 27 attached to the output shaft and a receiving cylinder portion 3c of one of the support frames 3a.
Frame rotating device 2 with driven gear 28 meshing with
9.

The support frame rotating device 29 is capable of rotating the pair of support frames 3, 3a around the reference concrete supply pipe 16 by the operation of the driving device 26. Material M in
The angular position of the outward running portion 6a of the endless belt 6, which is the projection portion (discharge portion) of the M1 and M2, is determined by the concrete supply pipe 1
It can be changed around 6.

Next, the operation of the concrete projecting sprayer of the present invention will be described. After circulating the endless belt 6 to rotate the pair of rotary plates 1 and 1a, concrete M1 to which a predetermined pressure is applied by a pump or the like (not shown) is supplied to the material storage unit 15 through the concrete supply pipe 16. Further, the liquid or powdery quick setting agent M2 is supplied to the rotating plate 1, 1
It is supplied through the quick-setting agent supply pipe 17 while being sucked into the material storage section 15 which is at a negative pressure by the rotation of a. As described above, while the quick-setting agent M2 is suctioned by the negative pressure, it goes to the tip opening 17a of the quick-setting agent supply pipe 17, but the air is sucked also from the limited gap 37 in the swivel section 35. Does not flow back into the gap 37.
The suction of the air does not hinder the function of spraying the material. Further, the swivel section 35 is simplified by the above mechanism.

As described above, the two materials M1 and M2 fed into the central portion of the material accommodating section 15 are discharged by centrifugal force due to the rotation of the first and second rotating blades 20 and 21, the dispersion passage 23, and the like. While rotating due to the contact (adhesion) with the plates 1 and 1a and the endless belt 6, it moves toward the inner surface of the endless belt 6 in combination with the feeding pressure, centrifugal force, own weight, etc., while the concrete M1 It is sufficiently mixed (kneaded) with the quick setting agent M2. In the one equipped with the acceleration blade 2,
Of course, these acceleration blades 2 contribute to the mixing action.

The concretes M1 and the quick-setting agent M2 in the mixed state of the portions pressed against the endless belt 6 in the material storage section 15 are adhered to the outwardly running portion 6a with the adhesive at the open position of the endless belt 6. Is emitted and projected from the portion 6a toward the surface to be sprayed. The acceleration blade 2d provided on the outermost peripheral portion contributes not only to the material mixing function but also to the discharging action.

When the spraying operation is interrupted or terminated, the material storage section 15 for the concrete M1 and the quick-setting agent M2 must be set in advance.
, The endless belt 6 and the rotating plate 1
By spinning 1a for a short time, almost all of the materials M1 and M2 in the mixed state in the material container 15 hardly remain there and are discharged to the outside through the outward running portion 6a. .

In the spraying machine of the present invention, a screw conveyor (not shown) is provided in the concrete supply pipe 16 for the purpose of feeding only the concrete M1 to the material storage section 15 at a required pressure. Is not a hindrance.

[0040]

According to the concrete type spraying machine of the present invention described above, when the spraying operation is interrupted or terminated, the particles of the material are blown off and any one of the airframes including the material accommodating part is blown off. Since the mixed concrete and quick-setting admixture do not remain at any point, cleaning to remove the mixture of concrete and quick-setting admixture from the airframe every time the spraying operation is interrupted or terminated is not required, and work efficiency is reduced. In addition to the improvement of the spraying, the malfunction of the spraying machine due to the solidification of the mixture can be eliminated. Further, a screw conveyor such as a conventional spraying machine is not required, and a set including a driving device is not required, so that effects such as reduction in machine manufacturing cost, simplification, and weight reduction can be achieved.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view showing an embodiment of a concrete-type projection spraying machine of the present invention.

FIG. 2 is a cross-sectional rear view showing a main part of the spraying machine of FIG.

FIG. 3 is an enlarged vertical sectional side view showing a main part of the spraying machine shown in FIG. 1;

FIG. 4 is an enlarged longitudinal rear view showing a material storage portion of the spraying machine shown in FIG. 1;

FIG. 5 is an enlarged rear view showing an assembling structure of a first rotating blade and a second rotating blade to a rotating plate.

FIG. 6 is an enlarged vertical sectional plan view of the assembly structure.

FIG. 7 is a vertical sectional side view illustrating a conventional concrete type spraying machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotating plate 2 Acceleration blade 2a-2d Acceleration blade 3, 3a Support frame 3b, 3c Cylinder part 3d Flange 4 Hollow shaft 5 Bearing 6 Endless belt 6a Outward running part 7 Pulley 8 Rotary shaft 9 Bearing 10 Drive device 11 Bearing 12 Non-rotating shaft 13 Flange portion 14 Take-up means 15 Material storage section 16 Concrete supply pipe 16a Opening 17 Quick-setting agent supply pipe 17a Opening 18, 19 Connection pipe 20 First rotating blade 21 Second rotating blade 22 Mounting plate portion REFERENCE SIGNS LIST 23 dispersion passage 24 mounting projection 25 mounting plate 26 driving device 27 driving gear 28 driven gear 29 support frame rotating device 30 guide member 31 bolt 32 ridge 33 annular groove 34 slip-off preventing means 35 swivel portion 36 gap 37 gap 38 bolt 91 Material supply device 92 Outer cylinder 93 Screw conveyor 94 Conveyor Drive 95 rotates plate 97 material receiving portion 98 the concrete such supply pipe 99 quick-setting admixture supply pipe 100 pulley 101 pulley drive M1 concrete class M2 Kyuyuizai

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masatomo Nakajima 2-2-1 Konan, Minato-ku, Tokyo Obayashi Corporation Tokyo Head Office (72) Inventor Hideo Imai 2-1-1 Nihonbashi Muromachi, Chuo-ku, Tokyo No. within Mitsui Miike Works Co., Ltd. QH10 4F042 AB05 CB02 CB19 CB27

Claims (6)

[Claims] A material accommodating portion is constituted by a pair of rotary plates supported so as to be rotatable around the same axis at a predetermined interval, and an endless belt wound around the two rotary plates. The concretes and quick-setting agent supplied to the part are discharged at a part where the endless belt driven by circulation is moved outward at an open position where the endless belt is separated from the rotating plate. A configuration in which concrete and quick-setting agent are individually supplied into the material storage section from a concrete-type supply pipe and a quick-setting agent supply pipe communicating with the opening through an opening provided in the center of the rotating plate. Concrete spraying type spray machine characterized by having done. 2. The method according to claim 1, wherein the openings are provided substantially on the center axes of both rotating plates, respectively, and the leading end opening of the concrete supply pipe and the leading end opening of the quick-setting agent supply pipe are arranged opposite to each other. The spraying machine for concretes according to claim 1. 3. An accelerating blade having a function of intermittently accelerating concrete and a quick-setting agent and having a function of mixing both materials is provided between said two rotating plates. The concrete type spraying machine described. 4. The rotating blade is connected to an acceleration blade and / or a connecting member between the rotating plates, and one of the rotating plates is fixed to a material supply pipe of one of the concrete and the quick setting agent by a hollow shaft. The cantilever is supported by a non-contact type swivel part in which a small gap is formed in the shaft support part, a little enters the tip opening of the material supply pipe serving as the fixed hollow shaft, and the rotary plate and The first and second rotating blades having the function of diffusing the concretes or the quick-setting agent and imparting a centrifugal force to the material or the quick-setting agent by maintaining the negative pressure in the material accommodating portion by concentric rotation with the fixed hollow shaft concentrically. The concrete type spraying machine according to any one of claims 1 to 3, wherein the spraying machine is arranged. 5. The fixed hollow shaft of the cantilevered rotary plate is a quick-setting agent supply pipe, and slightly enters a front end opening of a concrete supply pipe located opposite to the quick-setting agent supply pipe. The second rotary blade having the function of diffusing concrete extruded from the supply pipe by applying rotation with the rotary plate and applying a centrifugal force thereto, and maintaining the material storage portion at a negative pressure is connected to the concrete supply pipe. The concrete-type spraying machine according to claim 4, wherein the concrete-type spraying machine is arranged concentrically with the sprayer. 6. The configuration according to claim 4, wherein the fixed hollow shaft of the cantilever-supporting rotary plate is a quick-setting agent supply pipe, and the rotating plate on the quick-setting agent supply pipe side has an inner surface on the material storage portion side. A passage communicating with a tip opening of the quick-setting agent supply pipe and discharging the quick-setting agent changed in the direction perpendicular to the axis by the first rotary blade to a discharge port located at a fixed distance from the axis; A concrete type spraying machine characterized by being provided radially.