JP3078987B2 - Method and apparatus for cleaning rapidly hardened concrete stirring nozzle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to rapid hardening in a system for supplying a ready-mixed concrete used for forming a concrete wall on the inner peripheral wall of a tunnel and a hardened material for accelerating the hardening time of the concrete. The present invention relates to a method and an apparatus for cleaning a concrete stirring nozzle.

[0002]

2. Description of the Related Art In general, after excavation of a tunnel, ready-mixed concrete mixed with a hardened material is sprayed on its inner peripheral wall surface, and the inner peripheral wall surface of the tunnel is protected by the sprayed concrete wall in a short time. Also, after excavation of the tunnel, with the arc-shaped formwork placed near the inner peripheral wall of the tunnel,
There is a method of filling a molding space between a formwork and a tunnel inner peripheral wall surface with fresh concrete together with a hardened material to form a concrete wall for preventing collapse of the tunnel inner peripheral wall surface.

[0003]

In the former protection work, fresh concrete is sprayed, so there is a problem in the environmental protection in the tunnel, and since the concrete surface becomes uneven, the workability of setting a waterproof sheet is also affected. There is. The latter is a concrete pump that pumps fresh concrete from a storage tank and pumps it, a ready-mixed concrete / rapid hard material stirring nozzle installed at the end of the concrete transfer pipe, and a storage tank for the hard concrete. A rapid hardening material supply device for supplying the rapid hardening material pressure-fed from the tank by an injection pump into the stirring nozzle;

[0004] In the latter supply system, since the tip of the stirring nozzle is detachably connected to the concrete form, there is a problem that the stirring nozzle cannot be quickly cleaned after the concrete casting is completed. .
That is, when washing the stirring nozzle, after the ready-mixed concrete has been supplied into the mold, the stirring nozzle is removed from the mold to block the discharge port, and the worker uses the water supply nozzle in the stirring nozzle. Since the washing water is supplied in this manner, there is a problem that the washing operation of the stirring nozzle is troublesome and takes a long time.

A first object of the present invention is to provide a ready-mixed concrete / hard material supply system which can easily and quickly clean the inside of the stirring nozzle without removing the stirring nozzle from the mold after the concrete casting. An object of the present invention is to provide a method and an apparatus for cleaning a concrete stirring nozzle.

A second object of the present invention is to provide a ready-mixed concrete with a simplified structure in addition to the first object.
It is an object of the present invention to provide an apparatus for cleaning a rapidly hardened concrete stirring nozzle in a hardened material supply system.

A third object of the present invention is to provide an apparatus for cleaning a rapidly hardened concrete stirring nozzle in a ready-mixed concrete / hardly hardened material supply system which can further simplify the structure in addition to the first object. is there.

[0008]

According to the first aspect of the present invention,
In order to achieve the first object, a concrete pump for pumping ready-mixed concrete to a transfer pipe, a supply source of a rapid hardening material for rapidly hardening the ready-mixed concrete, A ready-mixed concrete / hard material supply system comprising: a stirring nozzle for stirring the hard material supplied from the rapid hard material supply source and supplying it to a molding space formed inside the mold; Is provided with a discharge cylinder to which fresh concrete is supplied and a water supply nozzle in the vicinity of the discharge cylinder , and the stirring nozzle is mounted on the same mold frame at a position communicating with the discharge cylinder, and concrete is poured into the molding space. after completion, it switches the stirring nozzle to a position wherein the water supply nozzle and communicating, and, in a state shielded from the discharge tube, to perform cleaning in the nozzle a cleaning fluid is supplied into the stirring nozzle It is.

According to a second aspect of the present invention, there is provided a concrete pump for pumping ready-mixed concrete to a transfer pipe, a supply source of a rapid hardening material for rapidly hardening the ready-mixed concrete, and A ready-mixed concrete, which is connected to the tip end and has a stirring nozzle for stirring the ready-mixed concrete and the fast-hardened material supplied from the rapid-hardened material supply source to supply the mixture to a molding space formed inside the formwork; In the hardwood supply system, the stirring nozzle is supplied with ready-mixed concrete.
Between the supply position where the cleaning fluid is supplied and the cleaning position where the cleaning fluid is supplied.
It is supported by the formwork so that it can be switched by the switching means.
Water supply to the opening of the tip of the stirring nozzle at the cleaning position
A nozzle was attached to the mold.

According to the third aspect of the present invention, in order to achieve the second object, in the second aspect, the supply position corresponding to the discharge port of the ready-mixed concrete formed in the formwork is separated from the discharge position. Switching means for switching the stirring nozzle between the washing position and the washing position, and a shielding plate for shielding the discharge port when the stirring nozzle is switched to the washing position are provided.

Further, in order to achieve the third object, in the invention according to claim 4, the opening of the tip end of the stirring nozzle is fixed at a position corresponding to the discharge port of the formwork.
A shielding plate that is switched between a position for shielding the opening and a position for opening the opening corresponding to the tip opening of the nozzle is provided, and a jet port of the cleaning fluid is opened at the tip of the stirring nozzle. The opening is provided with an on-off valve.

[0012]

According to the first aspect of the present invention, a discharge tube and a water supply nozzle are provided near the discharge tube on the mold, and the stirring nozzle is mounted on the mold at a position communicating with the discharge tube . After the concrete placing operation is completed, the stirring nozzle is switched to a position communicating with the water supply nozzle,
In addition, in a state where the discharge cylinder is shielded, the cleaning fluid is supplied into the stirring nozzle, and the inside of the nozzle is cleaned. For this reason, there is no need to remove the stirring nozzle from the mold to perform cleaning, and the cleaning operation is quickly and reliably performed before the rapidly hardened material is hardened.

According to the second aspect of the present invention, after the ready-mixed concrete is supplied to the molding space inside the formwork, the stirring nozzle is turned on.
Cleaning fluid is supplied from the supply position where concrete is supplied.
Is switched to the cleaning position to be
Water supply nozzle communicating with the tip opening of the stirring nozzle at
When the cleaning fluid is supplied to the stirring nozzle from inside, the inside of the stirring nozzle is easily and quickly cleaned. The fluid after washing flows backward in the concrete transfer pipe and is discharged to the outside through, for example, a drain port of a pipe switching device.

Further, according to the third aspect of the present invention, after the ready-mixed concrete is supplied to the molding space inside the formwork, the switching means is operated to switch the stirring nozzle from the supply position to the washing position. Is shielded. After that, when the cleaning fluid is supplied into the stirring nozzle by operating the fluid supply means,
The inside of the stirring nozzle is easily and quickly cleaned by the cleaning fluid.

According to the third aspect of the present invention, when the position of the stirring nozzle is switched by the switching means, the position of the shielding plate is switched between the position where the discharge port is opened and the position where the stirring port is blocked, so that the structure of the cleaning device is simplified. .

According to the fourth aspect of the present invention, after the ready-mixed concrete is supplied to the molding space inside the formwork, the shielding plate is switched to the shielding position of the discharge port and the on-off valve is opened. Is supplied to the inside of the nozzle, and the inside of the nozzle is cleaned.

According to the fourth aspect of the present invention, since the stirring nozzle is fixed at a predetermined position, the structure of the cleaning device is further simplified.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment in which the present invention is embodied in a washing device for a stirring nozzle in a working vehicle for casting a concrete wall on the inner peripheral surface of a tunnel will be described with reference to FIGS.

As shown in FIG. 8, a concrete wall casting vehicle 3 is mounted on a traveling road surface 2 under the tunnel 1 so as to be able to travel in the tunnel direction. The body frame 4 of the work vehicle 3 has driving wheels 5, and first to third for casting concrete along the inner peripheral surface 1 a of the tunnel via the form support mechanism 6 on the body frame 4. Formwork 7A-7C
Are supported as shown in FIG. The frames 8 constituting the form supporting mechanism 6 are provided with forms 7A to 7C on the inner peripheral surface 1 thereof.
A cylinder 9 is provided for approaching or separating from a. The first mold 7A is supplied with ready-mixed concrete.
A stirring nozzle 10 is provided, a second stirring nozzle 11 is mounted on the second mold frame 7B, and a third stirring nozzle 12 is mounted on the third mold frame 7C. And formwork 7A
7A to 7C are supported by the nozzles 10 to 12 in a state in which the nozzles 7 to 7C are supported at predetermined intervals along the inner peripheral surface of the tunnel 1.
A fresh concrete kneaded with a hardened material is supplied between the inner peripheral surface 1a and the concrete wall, and a concrete wall is cast into the tunnel inner peripheral surface 1a in two stages. That is, the first and second molds 7A and 7B synchronize concretely with the divided areas 13a and 13b on the lower left and right sides of the inner peripheral surface 1a which is divided into five equal parts. After that, both the molds 7A and 7B are moved to the intermediate regions 13c and 13d by a position switching mechanism (not shown), and concrete walls are cast in the uppermost region 13e and the regions 13c and 13d of the third mold 7C. Do.

As shown in FIG. 10, on one side of the first mold frame 7A, a movable mold frame 15 is switched between a retracted position and a molding position by a position switching mechanism 16 also having a function of supporting the mold frame 15. It is possible. Then, the mold supporting mechanism 6 is actuated to one end of the already cast concrete wall 17 to bring one end of the first mold 7A into contact, and the position switching mechanism 16 moves the movable mold 15 from the retracted position to the molding position. In this state, a molding space 18 for molding the concrete wall 17 is defined by these members.

The first to third stirring nozzles 10 to 12 are provided with a pump 22 for supplying ready-mixed concrete through a transfer pipe 21.
It is connected to the. In the middle of the transfer pipe 21, a two-port motorized pipe switching device 23 is provided. Further, an injection nozzle 24 provided with a check valve (not shown) for injecting a rapidly hardened material into the ready-mixed concrete is provided in the middle of the transfer pipe 21. The nozzle 24 is connected to a rapid hard material supply source 26 via a rapid hard material supply pipe 25. The supply pipe 25 is provided with an electromagnetic drain switching valve 27, and the valve 27 is switched from a drain port to an open-circuit port so that a hard material can be supplied into the transfer pipe 21. Also, the transfer pipe 21
A detector 28 for switching the drain switching valve 27 to the open circuit port when the concrete is detected by detecting the presence or absence of the ready-mixed concrete is provided on the upstream side of the injection nozzle 24.

Next, the mounting structure of the stirring nozzles 10 to 12 on the molds 7A to 7C and the cleaning mechanism of the stirring nozzles 10 to 12 will be described with reference to FIGS. Since the respective mounting configurations are the same, the mounting configuration of the first stirring nozzle 10 to the first mold frame 7A will be described.

As shown in FIGS. 1 and 2, a pair of mounting frames 29 are fixed inside the mold 7A in parallel with each other. A mounting plate 30 and a sliding plate 31 are joined between the two mounting frames 29 in a superposed state, and both sides of the two plates 30 and 31 are mounted together with a pair of guide members 33 forming a dovetail groove 32 by bolts 34. It is fixed to a frame 29. A discharge cylinder 35 is fixed diagonally between the mold frame 7A and the mounting plate 30. A connecting cylinder 37 is connected to the distal end of the case body 36 of the first stirring nozzle 10, and a sliding plate 38 is fixed to the outer periphery of the distal end of the connecting cylinder 37. Both side edges of the sliding plate 38 can reciprocate along the dovetail groove 32 of the guide member 33. A cylindrical support cylinder 39 having a bottom is fixed to the slide plate 38 in parallel with the case body 36, and an upper end of the support cylinder 39 is opened above the slide plate 38. The mounting frame 29
Are connected to one ends of a pair of cylinders 40, respectively, and their rods 41 are connected to both outer peripheral sides of the support cylinder 39.

Therefore, when the rod 41 of the cylinder 40 is reciprocated, the stirring nozzle 10 and the support cylinder 39 are reciprocated along the dovetail groove 32 of the guide member 33, and the stirring nozzle 10 is moved as shown in FIG. The switching operation is performed between a position communicating with the discharge cylinder 35 and a position communicating with the water supply nozzle 46 as shown in FIG.

A cylinder 42 is accommodated in the support cylinder 39, and a rod 43 supports a shielding plate 44 for closing the discharge cylinder 35, and a shielding cylinder 45 is connected to the plate. The shielding plate 44 is fitted into the discharge cylinder 35 as shown in FIG. 4 by the operation of the cylinder 42 at a position corresponding to the discharge cylinder 35 so as to shield the cylinder 35.

A water supply nozzle 46 is fixed to the mounting plate 30 so as to be located in the vicinity of the discharge cylinder 35 and open below the sliding plate 31.
7 is connected. The water supply pipe 47 has an electromagnetic on-off valve 4
The on-off valve 48 is connected to a supply 49 of cleaning water. Therefore, when the on-off valve 48 is opened while the stirring nozzle 10 is held at the washing position shown in FIG. 4, washing water is injected from the water supply nozzle 46 into the stirring nozzle 10. A grease supply nozzle 50 is provided on each of the guide member 33 and the shielding plate 44 to ensure lubrication of the sliding surface.

Next, the stirring nozzle 10 will be described mainly with reference to FIGS. A support shaft 53 is connected to a drive shaft 52 of the stirring motor 51 fixed to one end of the case body 36 so as to be synchronously rotatable by spline fitting. A mounting tube 54 is attached to the support shaft 53 by spline fitting. The pipe is fitted so as to be able to rotate synchronously, and the stirring blades 55 are cantilevered at a plurality of places on the pipe. A spiral stirring blade 56 is attached to the base end of the attachment tube 54. As shown in FIG. 6, the lower end of the stirring blade 56 is vertically
As shown in FIG. 7, a shielding plate 56a is formed in the radial direction.

As shown in FIG. 7, an opening 57 for maintenance and inspection of the stirring blade 55 is formed in the case main body 36, and the opening 57 is closed by a lid 58. It is fixed by bolts 58 and the lid 58
A handle 59 is attached to.

Next, the operation of the ready-mixed concrete / rapid hard material supply system configured as described above will be described. 1 and 10 show a state in which the stirring nozzle 10 corresponds to the discharge cylinder 35, and ready-mixed concrete can be supplied from the nozzle 10 into the molding space 18. FIG. In this state, when the start switch (not shown) is turned on to start the concrete pump 22, the ready-mixed concrete is supplied into the transfer pipe 21. With the drain switching valve 27 switched to the open circuit port,
When the arrival of the ready-mixed concrete is detected by the detector 28, the rapid hard material supply source 26 is activated, and the rapid hard material is supplied to the supply pipe 25.
Is injected into the transfer pipe 21 by the injection nozzle 24. For this reason, the ready-mixed concrete is transferred into the stirring nozzle 10 together with the rapidly hardened material, where it is efficiently stirred and kneaded by the stirring blades 55 and 56, and supplied to the molding space 18 from the connecting tube 37 and the discharge tube 35.

When the concrete placing operation into the molding space 18 is completed, the concrete pump 22 and the hard material supply source 26 are stopped, and the supply of the ready-mixed concrete and the hard material is stopped, and the drain switching valve is provided. 27 is switched to a drain port. Further, the piping switching device 23 is switched from the open circuit port to the drain port, and the transfer pipe 21 downstream of the device 23 is opened.

Next, when the cylinder 40 is operated in FIG.
0 is guided by the dovetail groove 32 of the guide member 33 and is moved leftward in FIGS. 1 and 10, and the stirring nozzle 10 is stopped at a position corresponding to the water supply nozzle 46. Then, the cylinder 42 in the support cylinder 39 is operated in FIG.
The shielding plate 44 and the shielding cylinder 45 move forward and enter the discharge cylinder 35, and the cylinder 35 is shielded.

Next, when the electromagnetic on-off valve 48 is opened in FIG. 10, the washing water is supplied from the washing water supply source 49 into the stirring nozzle 10 through the water supply pipe 47 and the nozzle 46. Therefore, the inside of the nozzle 10 is cleaned, and the fouling cleaning water flows backward through the transfer pipe 21 together with the residual ready-mixed concrete and the hardened material, and is discharged to the outside from the drain port of the pipe switching device 23.

The cleaning operation time in the stirring nozzle 10 is adjusted by changing the opening time of the on-off valve 48. When the on-off valve 48 is closed and the cleaning operation is completed, the cylinder 42 is retracted, and the shielding plate 44 and the shielding cylinder 45 are pulled out from the discharge cylinder 35. Thereafter, the cylinder 40 is operated, and the stirring nozzle 10 and the support nozzle are supported. The cylinder 39 is returned to the original position shown in FIGS. Also, the pipe switching device 23 is switched from the drain port to the communication port, and is prepared for the next concrete wall 17 placing operation.

In the first embodiment, the cylinder 40 for switching the first to third stirring nozzles 10 to 12 between the operating position and the washing position is provided, and water is supplied at the washing position. Since the nozzle 46 is provided, the stirring nozzles 10 to 12 are provided after the concrete is poured.
The inside can be quickly and reliably cleaned.

In the first embodiment, the stirring blades 55, 56
As shown in FIGS. 5 to 7, the experimental results showed that the stirring and kneading of the rapidly hardened material to the ready-mixed concrete were uniformly performed by the shapes and the mounting configurations of the blades 55 and 56. That is, it was found that the stirring nozzle of the above-described embodiment performed the stirring action more uniformly than the conventional stirring blade in which the entire stirring blade was a screw blade.

In the above-described embodiment, the shielding plate 56a is formed vertically at the lower end of the stirring blade 56 as shown in FIG. 6 and in the radial direction as shown in FIG. For this reason,
When the stirring blade 56 is rotated in the reverse direction, gravel can be prevented from being caught between the lower end of the blade 56 and the inner bottom surface of the case body 36.

Next, a second embodiment of the present invention will be described with reference to FIG. In this embodiment, the stirring nozzle 10 is mounted corresponding to the discharge port 61 provided in the mold 7A. A sliding plate 38 is connected to the tip of the stirring nozzle 10 so as to reciprocate along the dovetail groove 32 of the guide member 33, and a shielding plate 44 is formed integrally with the sliding plate 38. The rod 4 of the cylinder 40
When 1 is reciprocated, the stirring nozzle 10 is switched between the concrete supply position and the washing position. The tip of the water supply pipe 47 is connected to the distal end portion of the to case <br/> scan body 36,
An electromagnetic switching valve 48 is provided at the connection portion.

Therefore, the stirring nozzle 1 is
When 0 is moved to the left in FIG. 11, the discharge port 61 is shielded by the shielding plate 44, and the opening at the tip end of the case body 36 is closed by the mold 7A. In this state, the on-off valve 48
Is opened, washing water is injected into the nozzle 10,
The inside of the nozzle is cleaned.

In the case of this embodiment, since the discharge cylinder 35, the cylinder 42 and the like can be omitted, the structure of the cleaning device can be simplified as compared with the first embodiment. The other configuration and operation and effect are the same as those of the first embodiment.

Next, a third embodiment of the present invention will be described with reference to FIG. In this embodiment, the stirring nozzle 10 is fixed at a predetermined position with respect to the molds 7A to 7C, and a shielding plate 44 is interposed between the mold 7A and the nozzle 10, and the shielding plate 4 is provided.
4, a rod 41 of the cylinder 40 is connected. When the shielding plate 44 is switched to a position for shielding the opening at the tip of the nozzle 10 and the on-off valve 48 is opened, the nozzle 10
The inside is cleaned.

Therefore, in the third embodiment, since only the shielding plate 44 is reciprocated, the number of parts is reduced and the structure can be further simplified.
The other configuration and operation and effect are the same as those of the first embodiment.

The present invention is not limited to the above embodiment, but can be embodied as follows. (1) In the above embodiment, the motor 51 rotates the stirring blades 55 and 56 in the direction opposite to the concrete transfer direction during washing of the stirring nozzles 10 to 12. In this case, the cleaning effect inside the nozzle is enhanced. In this alternative example, when the on-off valve 48 is opened, the motor 51 is automatically reversely rotated, and when the valve 48 is closed, the motor 51 may be stopped.

(2) In the above embodiment, the concrete wall is cast on the peripheral wall surface in the tunnel.
For example, this may be embodied as a washing device for a stirring nozzle of a ready-mixed concrete / rapid-hardened material supply system of a working machine for casting concrete for fixing a pier, or may be embodied in various other concrete wall casting devices.

[0044] The technical idea other than claims can be understood from the above examples, it described with the effects below.

[0045]

[0046] Oite to claim 1, stirring method of the washing nozzle to rotate the stirring blade in the cleaning operation of the nozzle in the opposite direction. In the case of this method, the inside of the stirring nozzle can be more quickly and reliably cleaned.

In this specification, the cleaning fluid is
In addition to the washing water, for example, air, detergents, ceramic particles, and the like or a mixture thereof are also included.

[0048]

As described in detail above, the present invention has the following effects because it is configured as described in the claims.

According to the first aspect of the present invention, there is no need to remove the stirring nozzle from the mold to clean it, and the inside of the stirring nozzle is quickly cleaned before the hard material is hardened. According to the second aspect of the present invention, the inside of the stirring nozzle can be reliably and promptly cleaned after the concrete wall has been cast.

According to the third aspect of the invention, in addition to the effect of the second aspect, the structure of the cleaning device can be simplified. Further, according to the fourth aspect of the invention, in addition to the effect of the second aspect, the structure of the cleaning device can be further simplified.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a mold and a stirring nozzle according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing the relationship between a mold and a stirring nozzle.

FIG. 3 is a front view showing a mounting plate of the stirring nozzle.

FIG. 4 is a cross-sectional view showing a state where a stirring nozzle is moved to a cleaning position.

FIG. 5 is a longitudinal sectional view of a stirring nozzle.

FIG. 6 is a partially enlarged front view of a stirring blade.

FIG. 7 is a cross-sectional view of a stirring nozzle.

FIG. 8 is a front view showing a working vehicle for supplying ready-mixed concrete and hardwood.

FIG. 9 is a front view showing a formwork supporting mechanism of the concrete working vehicle.

FIG. 10 is a front sectional view showing a mounting state of a mold and a stirring nozzle.

FIG. 11 is a partial sectional view showing a second embodiment of the present invention.

FIG. 12 is a partial sectional view showing a third embodiment of the present invention.

[Explanation of symbols]

7A to 7C: first to third molds, 10 to 12: first to third stirring nozzles, 21: transfer pipe, 22: concrete pump, 26: rapid hard material supply source, 31: sliding plate, 33: Guide member, 35: Discharge cylinder, 36: Case body, 39: Support cylinder, 40, 42: Cylinder, 44: Shield plate, 46: Water supply nozzle, 47: Water supply pipe, 48: Cleaning electromagnetic on-off valve. 49
... a cleaning water supply source, 61 ... a discharge port.

Continuation of the front page (72) Inventor Shinji Masada 144, Shinjocho, Motomasu-cho, Gifu Prefecture Gifu Industry Co., Ltd. (56) References JP-A-1-219299 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) E21D 11/10

Claims (4)

(57) [Claims] 1. A concrete pump for pumping ready-mixed concrete to a transfer pipe, a supply source of a hardened material for rapidly hardening the ready-mixed concrete, and a supply of the ready-mixed concrete and the quick-hardened material connected to the tip of the transfer pipe. A ready-mixed concrete / rapid-hardened material supply system comprising: a stirring nozzle configured to agitate the fast-hardened material supplied from a source to supply the rapidly-hardened material to a molding space formed inside the formwork; A water supply nozzle is provided in the vicinity of the discharge cylinder and the discharge cylinder to be provided, and the stirring nozzle is mounted on the same mold frame at a position communicating with the discharge cylinder, and after the concrete placing operation into the molding space is completed, the stirring is performed. Switching the nozzle to a position communicating with the water supply nozzle, and
A method for cleaning a rapidly hardened concrete stirring nozzle, characterized in that a cleaning fluid is supplied into the stirring nozzle and the inside of the nozzle is cleaned while the discharge cylinder is shielded. 2. A concrete pump for pumping ready-mixed concrete to a transfer pipe, a supply source of a quick-hardened material for rapidly hardening the ready-mixed concrete, and a supply of the ready-mixed concrete and the hard-hardened material connected to the tip of the transfer pipe. A ready-mixed concrete / rapid-hardened material supply system comprising a stirring nozzle for stirring the fast-hardened material supplied from the source and supplying it to a molding space formed inside the formwork; Supply position
And a cleaning position to which the cleaning fluid is supplied by switching means.
Switchable and supported by the formwork,
The water supply nozzle communicating with the tip opening of the stirring nozzle
For ready-mixed concrete / rapid hardwood supply system attached to formwork
Cleaning apparatus definitive agitation nozzles. 3. A switching means for switching a stirring nozzle between a supply position corresponding to a discharge port of ready-mixed concrete formed on a formwork and a cleaning position separated from the discharge port, and the stirring nozzle according to claim 2, And a shielding plate for shielding said discharge port when switched to a cleaning position. 4. The stirrer nozzle according to claim 2, wherein the opening at the tip of the stirring nozzle is fixed at a position corresponding to the discharge port of the mold, and opens at a position corresponding to the opening at the tip of the nozzle to block the opening. A shielding plate that is switched between a position and a position is provided;
An injection port for the cleaning fluid is opened at the tip of the stirring nozzle,
A washing device for a rapidly hardening concrete stirring nozzle provided with an opening / closing valve at the opening.