JPH0557400B2 - - Google Patents

Description

[Detailed Description of the Invention] <<Industrial Application Field>> The present invention involves mixing and stirring a quick setting agent into fresh concrete and projecting it onto the construction surface of the inner wall in order to perform concrete lining for the inner wall of tunnels. Relating to a device for

<<Prior Art>> In general, a method of spraying concrete onto a construction surface using compressed air is adopted as a concrete lining method in tunnel construction and the like.

However, when using the above method, a large amount of compressed air is used to spray the concrete, which inevitably results in a large amount of dust being generated during spraying, which poses a major problem.

Therefore, a proposal was made to reduce the amount of dust generated by rotating the rotary blades at high speed without using compressed air and projecting concrete using the rotational energy (Japanese Patent Application Laid-Open No. 60-78099, JP-A No. 57 -143066, Utility Model Application Publication No. 57-123899) have also been made.

However, when the above-mentioned proposals are adopted, the quick-setting agent and fresh concrete are not sufficiently stirred, resulting in an unsatisfactory quick-setting effect, and the cast concrete often falls off. Rather, it is intended to limit the outlet for the concrete sent into the inner cavity of the rotary vane, and to project the concrete from the outlet to the outside by the rotary vane, which rotates at high speed. The concrete is spread over a fairly wide area, and as a result, it is inconvenient to perform the projecting work on small defects, and furthermore, the concrete may enter between the rotary blade and the casing that rotatably supports it. When this solidifies, smooth rotation of the rotary blades cannot be guaranteed, and when operation becomes impossible, a great deal of time and effort must be spent to repair the problem.

<<Problems to be Solved by the Invention>> In view of the above-mentioned difficulties of the conventional apparatus, the present invention uses a small amount of compressed air by dispensing a powdery quick-setting agent into the supplied ready-mixed concrete. This makes it possible to mix the quick-setting agent with just one step, thereby eliminating any concerns about the generation of dust, and also allowing the mixing of the mixed quick-setting agent and the ready-mixed concrete to be carried out by the stirring feed blade in the next stage. Therefore, by making it possible to perform the concrete sufficiently, the rapid setting effect can be achieved in a satisfactory state, and furthermore, a back blade is provided protruding from the appropriate position of the projection blade that is driven and rotated to project the concrete. Then, the concrete that tries to enter between this and the casing is given energy in the opposite direction so that it can be stopped and the projection blade can always rotate smoothly. That is the purpose.

<<Means for Solving the Problems>> In order to achieve the above-mentioned object, the present invention has a stirring casing equipped with a stirring motor which is externally fixed to the closed base end of the stirring casing and is capable of rotating freely. A concrete supply pipe through which fresh concrete is fed under pressure is connected with an opening near the closed base end of the stirring casing, and a powder quick-setting agent is compressed through this concrete supply pipe. The supply nozzle of the quick-setting agent supply pipe, which is fed under pressure by air, is installed inside the concrete supply pipe,
A projection part is connected to the tip side of the stirring casing, an open-hole stator in which the projection part is connected to the open end of the stirring casing, a closed stator fixed to the stator, and a closed stator between the two stators. , a projection blade which is sandwiched so as to be able to rotate freely by a projection motor which is externally fixed to a closed stator, and whose outer periphery is covered by an annular casing which is sandwiched between the two stators. The projection blade is
an open end plate that communicates from the open end via the open stator; a closed end plate to which the rotation shaft of the projection motor is attached; A plurality of inner blades are fixedly spaced apart from each other so as to be fixed, and a plurality of inner blades are provided on the outer surfaces of both end plates of the above, spaced apart from each other by a desired distance in the circumferential direction, and arranged on the open-hole stator and the closed stator, respectively. The present invention provides a concrete lining device for tunnels having an agitation mechanism for mixing an accelerating agent, which comprises a plurality of required back blades, and a jetting outlet is provided in the annular casing opposite to the jetting blade. .

<<Operation>> When the concrete lining device according to the present invention is used, powdered quick-setting agent is jetted out from the supply nozzle of the quick-setting agent supply pipe and mixed into the fresh concrete that has been force-fed into the concrete supply pipe, and this is stirred. is supplied to the stirring blade in the casing for
Here, the fresh concrete and the quick-setting agent are sufficiently stirred and sent to the projection section by the rotation of the stirring feed blade by the stirring motor.

The agitated concrete is sent to the inner cavity of the projection blades in the projection section, where it passes between the inner blades by the centrifugal force of the projection blades rotated by the projection motor, and is further transferred to the projection part of the annular casing. The light is projected from the discharge port in the tangential direction of the projection blade.

During this projection, the concrete tries to enter the gap between the annular casing and the open-hole stator and the closed stator, but since the back blades are located on both the left and right sides of the projection blade and are rotating, this intrusion does not occur. Since the concrete is sent back by centrifugal force in a manner that scrapes the concrete, there is no possibility that the concrete will stick between the projection vanes and the two stators and impede their rotation.

<<Example>> The present invention will be explained in detail with reference to the drawings.
As clearly shown in the figure, the cylindrical stirring casing 1 has a closed side plate 1a fixedly attached to the closed base end 1b.
is formed, and the other end is an open end 2, and a concrete supply pipe 3 is provided near the closed base end 1b of the casing 1 so as to communicate with this in a perpendicular manner.

A stirring feed blade 1c is rotatably fitted in the stirring casing 1, and a support shaft 1d fixed to the left end in the figure is externally fixed to the closed side plate 1a of the closed base end 1b. The rotating shaft 4a of the stirring motor 4 is attached to the rotating shaft 4a.

Next, a material hose 3b is connected to the concrete supply pipe 3 via a coupling ring 3a in order to supply fresh concrete under pressure to the concrete supply pipe 3.
Fresh concrete can be pumped from a fresh concrete supply source (not shown).

Further, the concrete supply pipe 3 is provided with an quick-setting agent supply pipe 5 for supplying a powdery quick-setting agent, and the tip end 5a of the pipe 5 in the same supply pipe 3 is connected to the concrete supply pipe 3. It is bent perpendicularly toward the stirring casing 1 at the axial center position of 5, and a supply nozzle 5b is bored at its tip, and 5c in the figure is connected to the quick-setting agent supply pipe 5 by a hose joint 5d. The transportation hose 5c is used in conjunction with a quick-setting agent storage tank (not shown) capable of pumping powdered quick-setting agent.

Therefore, if the internal pressure of the quick-setting agent storage tank is made slightly higher than the concrete pressure at the location where the supply nozzle 5b is arranged,
It is possible to transport the powdered quick-setting agent by using only a small amount of compressed air.

Next, in the present invention, a projection section 6 is provided in series with the open end 2 of the above-mentioned stirring casing 1.

Here, the projection section 6 includes an open hole stator 6b fixedly connected to the open end 2 by bolts 6a so as to be in communication with the open end 2, and a closed hole stator 6b fixedly fixed thereto by tightening bolts 6c and nuts 6d. A stator 6e, a projection blade 7 rotatably interposed between the stators 6b, 6e, and the projection blade 7.
An annular casing 8 is wrapped around the outer periphery of the stator 8 and is sandwiched between the stators 6b and 6e.
Equipped with:

A projection motor for rotationally driving the projection blade 7 is externally fixed to the closing stator 6e, and its rotating shaft 9a is of course attached to the projection blade 7.

Here, as clearly shown in FIGS. 2 to 4, the projection blades 7 are connected to a perforated end plate 7a which is in communication with the open end 2 of the stirring casing 1 via the perforated stator 6b. and a closed end plate 7b to which the rotating shaft 9a of the projection motor 9 is attached, and a closed end plate 7b which is fixedly spaced apart from each other radially on the outer peripheral end thereof between the two plates 7a and 7b. A plurality of inner blades 7c, 7c, . . . are provided.

Therefore, the projection blade 7 has the above-mentioned perforated end plate 7a.
An inner cavity 7e is formed which opens at the inlet 7d of the inlet 7d and is surrounded by the inner blades 7c, 7c, . . .
e communicates with fan-shaped discharge passages 7f, 7f, . . . formed between the inner blades 7c, 7c, .

Further, on the outer surfaces of the apertured end plate 7a and the closed end plate 7b of the projection blade 7, in the illustrated example, back blades 7g are arranged radially at desired intervals on the outer end side thereof. 7g..., 7h, 7h are provided in a protruding manner, and their outer surfaces are configured to come into sliding contact with the inner surfaces 6b', 6e' of the recessed circumferential grooves of the open-hole stator 6b and closed stator 6e, respectively.

Further, as described above, the open end plate 7a and the closed end plate 7b
A projection outlet 8a having approximately the same size as one discharge passage 7f is opened in the annular casing 8 sandwiched between the two, and the position of the outlet 8a is selected at a desired location during the sandwiching process. It is possible.

As schematically shown in FIG. 5, the concrete lining device configured as described above has a leg stand 10 fixed to the above-mentioned projection section 6 of the device, and this leg stand 10 is attached to the base machine A. The concrete machine device is mounted and fixed on a support base B, and by operating the base machine, the concrete machine device can be raised and lowered, rotated, and tilted to perform lining work.

Therefore, when the concrete lining device is operated, the internal pressure of the quick-setting agent storage tank is reduced to the supply nozzle 5 in the concrete supply pipe 3.
The internal pressure in the vicinity of b is kept higher, and a small amount of compressed air is used to transfer the powdered quick-setting agent to the quick-setting agent transport hose 5.
c, the quick setting agent is injected into the fresh concrete from the supply nozzle 5b via the quick setting agent supply pipe 5.

The fresh concrete mixed with the quick-setting agent in this way is pumped into the next-stage stirring casing 1, where it is moved to the right by the stirring feed blade 1c rotated by the stirring motor 4. The concrete is stirred while being fed, and the sufficiently mixed and stirred concrete is sent from the open end 2 to the next stage projection section 6.

The concrete enters the inner cavity 7e from the open end 2 through the inlet 7d of the projection blade 7, but at this time, the projection motor 9 rotates the projection blade 7 at high speed, so the rotation The inner blades 7c, 7c... pass through the discharge passages 7f, 7f... formed between the inner blades 7c, 7c..., and the annular casing 8
Concrete is ejected from the projection outlet 8a in the tangential direction of the projection vane 7 as shown by arrow C, and is projected onto the construction surface to perform concrete lining.

At this time, the concrete is discharged from the projection outlet 8a.
When projecting from the hole, the stator 6b and the closed stator 6e try to enter the inner surfaces, but since the back blades 7g, 7g..., 7h, 7h... of the projection blades 7 are rotating, The above-mentioned concrete receives force toward the outer circumference and is prevented from entering.
Therefore, the smooth rotation of the projection blade 7 is not hindered, and there is no possibility that it becomes difficult or impossible to start the rotation of the projection blade 7 during operation after the start and end.

≪Effects of the Invention≫ Since the present invention is constructed as described above, the powdered quick-setting agent is sufficiently stirred and mixed with the ready-mixed concrete before being projected. , there is no problem caused by peeling and falling, and since the concrete after being ejected from the projection vane is ejected from the ejecting outlet toward the construction surface, the concrete does not spread as much due to the size of the ejecting outlet. This makes it suitable for small-area repair work.

Additionally, the protruding back blade eliminates the problem of concrete inadvertently entering the small gap between the rotor and stator, which would interfere with the rotor's rotation, resulting in a lighter and more compact overall design. Therefore, the operability of the base machine A and the like is improved, and the construction of concrete lining on the back side of the support steel is also facilitated.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway plan view of a concrete lining device according to the present invention, FIG. 2 is an enlarged cross-sectional plan view showing the projection part of the device, and FIG. 3 is a cross-sectional view taken along the line - in FIG. , FIG. 4 is a perspective view of the projection blade, and FIG. 5 is a schematic front view of the device in use. 1... Stirring casing, 1b... Closed base end,
1c... Stirring feed blade, 2... Open end, 3...
Concrete supply pipe, 4... Stirring motor, 5...
... Accelerating agent supply pipe, 5b... Supply nozzle, 6...
...Projection section, 6b... Open hole stator, 6e... Closed stator, 7... Projection blade, 7a... Open hole end plate,
7b...Closed end plate, 7c...Inner blade, 7g, 7h
... Back blade, 8 ... Annular casing, 8a ... Projection discharge port, 9 ... Projection motor, 9a ... Rotation shaft of the projection motor.

Claims (1)

[Scope of Claims] 1. The stirring casing is equipped with a stirring feed blade which can be freely rotated by a stirring motor externally fixed to the closed base end of the stirring casing, and a stirring feed blade is provided near the closed base end of the stirring casing. A concrete supply pipe through which fresh concrete is pumped is connected in an open manner, and a supply nozzle of the quick-setting agent supply pipe is installed through this concrete supply pipe and through which a powdery quick-setting agent is force-fed by compressed air. is installed inside the concrete supply pipe, a projection part is connected to the tip side of the stirring casing, and the projection part is connected to the open end of the stirring casing, and an open-hole stator is fixed thereto. A closed stator and an annular casing sandwiched between the two stators so as to be able to rotate freely by a projection motor externally fixed to the closed stator, and whose outer periphery is sandwiched between the two stators. a covered projection blade, the projection blade communicates with the open end via the open stator, and a closed end plate to which the rotation shaft of the projection motor is pivoted. , a plurality of inner blades fixedly spaced apart from each other radially on the outer circumferential side between the two end plates, and a desired spacing from each other in the circumferential direction between the outer surfaces of the two end plates. and a plurality of back blades adjacent to an open-hole stator and a closed stator, respectively, and spaced apart from each other by a distance, and a projection discharge port is provided in the annular casing opposite to the projection blade. Concrete lining equipment for tunnels with a stirring mechanism that mixes quick-setting agent. 2. A patent in which the pressure of the quick-setting agent storage tank, which is fed under pressure to the quick-setting agent supply pipe, is higher than the pressure of the concrete in the concrete supply pipe, and the supply nozzle of the quick-setting agent supply pipe is opened toward the stirring casing. A concrete lining device for tunnels having an quick-setting agent mixing mechanism according to claim 1.