JPH11117529A - Shotcrete method by rotary shotcrete machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shotcrete method by a rotary shotcrete machine capable of performing shotcrete work while securely mixing and agitating concrete and an accelerating agent together and easily avoiding clogging of concrete in a cylinder without much abrasion loss to the constituent parts. SOLUTION: An impeller apparatus 15 of a rotary shotcrete machine 10 comprises an inside impeller 11, outside impeller 12, and a guide sleeve 14 equipped with a communicating opening 13 interposed therebetween. And concrete 19 is supplied from the inside impeller 11 to the outside impeller 12 through the communicating opening 13 of the guided sleeve 14; and when spraying concrete by the outside impeller 12, a liquid accelerating agent is added and mixed through an accelerating agent supply pipe 20 to the concrete 19 to be stirred and supplied by an inside impeller 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for spraying concrete by a rotary spraying machine, and more particularly, to a method in which concrete sent through a cylindrical body is impelled by an impeller device provided at the tip of the cylindrical body. The present invention relates to a method for spraying concrete by a rotary sprayer that projects outside a device.

[0002]

2. Description of the Related Art A rotary spraying machine applies a centrifugal force to concrete to be projected in a manner similar to a centrifugal pump by rotating an impeller, and the centrifugal force causes the concrete to which a quick-setting agent is added to a spraying surface. It is a device that blows toward, and can easily solve problems such as generation of dust and rebound dross as compared with a blowing device using compressed air that has been conventionally used as a carrier medium. It is also easy to make the spray surface smooth. Therefore, for example, it is used for lining various tunnels from a small-section tunnel to a large-section tunnel, and other wall protection works.

On the other hand, in a concrete spraying operation using such a rotary spraying machine, a quick-setting admixture is added and mixed into the concrete so that the sprayed concrete is quickly cured and the sprayed surface can be protected quickly. Will be done.

[0004]

However, according to the conventional rotary spraying machine 60, as shown in FIG. 4, the liquid or powder quick-setting agent is added to the concrete at the rear of the cylinder 61 to which the concrete is fed. When the concrete moves toward the impeller device 64 including the inside impeller 62 and the outside impeller 63, the concrete is mixed by the screw 65 incorporated in the cylindrical body 61. When the concrete starts to harden during the movement of the concrete by the action, the wear of the components constituting the spraying machine 60 increases, and the time and economic loss increases,
When concrete is clogged in the cylindrical body 61, there is a problem that a great deal of labor is required for dismantling and cleaning.

Accordingly, the present invention has been made in view of such a conventional problem, and does not cause large wear of the constituent parts and easily prevents concrete from being clogged in the cylindrical body. An object of the present invention is to provide a method of spraying concrete by a rotary spraying machine which can surely mix and stir concrete and a quick-setting agent, and can easily perform spraying work even on a restricted cross section. It is assumed that.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to achieve such an object. The gist of the present invention is to provide concrete sent via a cylinder at the tip of the cylinder. In a method for spraying concrete by a rotary spray machine configured to project outside of the impeller device by an impeller device, the impeller device includes an inside impeller, an outside impeller, and a communication opening interposed therebetween. When the concrete is supplied from the inside impeller to the outside impeller through the communication opening of the guide sleeve, and the outside impeller projects and blows the concrete, the inside impeller mixes the concrete with the concrete. Characterized by mixing with added liquid quick setting agent In the spraying method of concrete by the Rotary sprayer.

That is, the present invention uses a liquid quick-setting agent excellent in stirring and mixing properties as a quick-setting agent, and uses a conventional rotary spraying machine to continuously transport concrete and stir and mix with the quick-setting agent. By eliminating the screw built in the cylinder, the wear of parts with a large economic burden is reduced, and the stirring and mixing action by the rotating inside impeller aims to obtain uniform and high quality sprayed concrete. It is.

Further, in the method for spraying concrete of the present invention, it is preferable that the liquid quick setting agent is added to concrete stirred by an inside impeller.

According to the method for spraying concrete of the present invention, in an impeller device comprising an inside impeller, an outside impeller, and a guide sleeve interposed therebetween, for example, the inside impeller is connected to the inside impeller via a supply pipe. Supply and add liquid quick setting agent. This inside impeller turns the concrete sent from the rear through the cylindrical body radially outward, and moves the concrete to the outside impeller through the communication opening of the guide sleeve. When the concrete is moved and supplied to the impeller, it also acts to mix and stir the concrete at the same time.

That is, according to the method for spraying concrete of the present invention, preferably, a liquid quick-setting material is added to concrete stirred and supplied to the outside impeller by the inside impeller, thereby stirring and mixing the inside impeller. By the action, the concrete and the liquid quick-setting admixture are surely mixed, and the mixed concrete moves to the outside impeller and is immediately sprayed on the spraying surface. Can be easily prevented from being clogged.

It should be noted that, depending on the composition of the concrete, the performance of the liquid quick-setting agent, the construction speed of the shotcrete, etc.,
When the liquid quick-setting agent is supplied and added to the inside impeller as described above, agitation and reaction time between the liquid quick-setting agent and the concrete may be incomplete, so in such a case, as an auxiliary means, the inside impeller is used. By adding the liquid quick-setting agent to the concrete at a position before being stirred, it is possible to secure a certain stirring effect and a certain reaction time during the transfer of the concrete in the cylinder. It is also effective to install a static stirring rod in the cylinder to enhance the stirring effect.

On the other hand, the concrete projecting direction is particularly required to move concrete pipes or the like by rotating the guide sleeve interposed between the inside impeller and the outside impeller to adjust the position of the communication opening. It can be easily set in any direction without performing.

[0013]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. The method for spraying concrete of the first embodiment is formed by mechanical excavation by a tunnel boring machine, for example.
It is adopted to form a concrete layer for covering and protecting the inner wall surface of the tunnel having a small cross section. As shown in FIG. 1, an inside impeller 11, an outside impeller 12, and Interposed communication opening 1
Impeller device 1 comprising a guide sleeve 14 provided with
5 is carried out using a rotary spraying machine 10 provided with the same.

That is, this rotary spraying machine 10
It has a cylindrical casing 16 as a cylindrical body fixed to a support base (not shown). This cylindrical casing 16 has one end bent to communicate with the concrete supply pipe 18 and the other end. The side is opened as a discharge port 17, and the concrete 19 fed from the concrete supply pipe 18 is transferred toward the discharge port 17 by the pressure.

A guide sleeve 14 is fitted into the cylindrical casing 16 so as to be relatively rotatable along the outer periphery of the cylindrical casing 16. The guide sleeve 14 has a distal end projecting from the distal end of the cylindrical casing 16. By doing so, it is interposed between the inside impeller 11 and the outside impeller 12, and is rotatably supported by the support stand via the bearing stand 26. A communication opening 13 as a discharge port for sending out the concrete 19 from the inside impeller 11 to the outside impeller 12 is formed in the tip projecting portion of the guide sleeve 14. 1
Nine projection directions will be determined.

On the other hand, on the outer periphery of the guide sleeve 14,
A rotating sleeve 28 is mounted so as to be relatively rotatable, and the inside sleeve 11 and the outside impeller 12 are connected to the rotating sleeve 28 as described later. It is rotatably supported by a support table via the table 30.

An impeller 32 is attached to the tip of the rotating sleeve 28 so as to cover the discharge port 17 of the cylindrical casing 16. The impeller 32 includes an inside impeller 11 located inside and an outside impeller 12 located outside. The outside impeller 12 includes a pair of annular disks 3 as shown in FIG.
A plurality of projection blades 42 are fixed radially between 8, 40. The outside impeller 12 is attached to a mounting rib 39 (see FIG. 1) provided at the tip of the rotating sleeve 28. By means of the bolt 37, the projection blades 42 are connected to and fixed to the distal end of the rotating sleeve 28 such that the projection blades 42 are arranged outside the distal end protruding portion of the guide sleeve 14.

The inside impeller 11 is constructed by fixing a plurality of guide vanes 46 radially on the inner surface of a circular plate 44, and the guide vanes 46 are arranged inside the distal end protruding portion of the guide sleeve 14. Thus, the opening 4 of the annular disk 38 outside the outside impeller 12
1 (see FIG. 3), the circular plate 44 is joined to the annular disk 38 by bolts 43 so as to cover the opening 41 (see FIG. 1), so that the inside impeller 11 It is connected and fixed to the tip of the rotating sleeve 28 via the side impeller 12.

Accordingly, an impeller device 15 comprising an inside impeller 11, an outside impeller 12, and a guide sleeve 14 having a communication opening 19 interposed therebetween is attached to the distal end portion of the cylindrical casing 16. Will be.

According to the rotary spraying machine 10 of the first embodiment, the rotary sleeve 28 to which the inside impeller 11 and the outside impeller 12 are connected and fixed.
Is rotated at a high speed via a drive motor 50 attached to the bearing base 30, whereby the inside impeller 11 is rotated.
And the outside impeller 12 is rotated,
The rotation angle of the guide sleeve 14 is adjusted by a rotation motor (not shown) attached to the support table, so that the position of the communication opening 19 can be controlled and adjusted.

Further, according to the rotary spraying machine 10 of the first embodiment, the quick-setting agent supply pipe 20 extends from the rear toward the inside impeller 11 through the space between the cylindrical casing 16 and the guide sleeve 14. By extending, the liquid quick-setting agent can be added and mixed into the concrete 19 supplied to the outside impeller 12 while being stirred by the inside impeller 11.

According to the first embodiment, the concrete 19 which has been pressure-fed through the concrete supply pipe 18 and has moved inside the cylindrical casing 16 toward the impeller device 15 is arranged radially. After being turned radially outward while being agitated by the plurality of guide blades 46, the air is supplied to the outside impeller 12 through the communication opening 13 of the cylindrical casing 16, and then toward the spray surface. It will be sprayed. The projection direction of the concrete 19 by the outside impeller 12 is as follows.
9 is supplied and determined by the circumferential position of the communication opening 13, and the projection direction is determined by driving the motor to adjust the position of the communication opening 13,
Thus, it can be easily controlled without moving the main body of the camera.

According to the first embodiment, by supplying the liquid quick-setting agent via the quick-setting agent supply pipe 20, the liquid quick-setting agent is supplied to the concrete 19 stirred and supplied by the inside impeller 11. Is added and mixed.

That is, according to the first embodiment, the concrete 19 and the liquid quick-setting admixture are surely mixed by the stirring and mixing action of the inside impeller 11, and the concrete 19 mixed with the liquid quick-setting admixture is After being moved to the outside impeller 12, the spray is immediately blown to the spray surface, so that the hardening of the concrete 19 does not clog the spray machine 10.

The projection direction of the concrete 19 is such that the guide sleeve 14 interposed between the inside impeller 11 and the outside impeller 12 is rotated to open the communication opening 1.
3 can be easily set in any direction by adjusting the position, so that it is not necessary to particularly move pipes and the like in accordance with the change of the projection direction, and it can be easily sprayed even in a tunnel with a small cross section. You can go.

FIG. 2 shows a rotary spraying machine 70 according to a second embodiment of the present invention. As a configuration different from the rotary spraying machine 10 according to the first embodiment, a cylindrical casing 16 and a guide sleeve 14 are provided. , The tubular casing 1 extends through the quick-setting agent supply sleeve 21 at the rear of the bearing base 26 instead of the quick-setting agent supply pipe 20 of the first embodiment extending toward the inside impeller 11.
6 is provided with a second quick-setting agent supply pipe 29 that communicates with 6.

According to the second embodiment, before the inside impeller 11, the cylindrical casing 1
Since the liquid quick-setting agent is added and mixed from the second quick-setting agent supply pipe 29 to the concrete 19 moving in the inside 6, the concrete 19 and the liquid quick-setting agent are stirred and mixed by the inside impeller 11 before being mixed. Therefore, it is possible to expect an agitating effect during the movement of the concrete 19 in the cylindrical casing 16.
The auxiliary means of the stirring action by the above can be obtained. It is also effective to install a static stirring rod in the cylindrical casing 16 to enhance the stirring effect.

The present invention is not limited to the embodiment of the above embodiment, but can be variously modified and adopted within the scope of the constitution described in each claim. For example, the method for spraying concrete of the present invention is not limited to the lining operation of a small-section tunnel formed by a tunnel boring machine, but can be employed for various other spraying operations.

[0029]

As described in detail above, according to the method for spraying concrete by the rotary sprayer of the present invention, the impeller device of the rotary sprayer includes an inside impeller, an outside impeller, and an A guide sleeve having an interposed communication opening is provided, and concrete is supplied from the inside impeller to the outside impeller via the communication opening of the guide sleeve, and when the outside impeller sprays concrete, the concrete is stirred and supplied by the inside impeller. The liquid quick-setting admixture is added to and mixed with the concrete, so that it does not cause significant abrasion of the components and easily avoids clogging of the cylinder with concrete. Easy spraying while mixing and stirring with quick-setting agent It is possible to Yuku performing work, can Yuku performed easily spraying work even constrained section.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a configuration of a rotary spraying machine employing a method for spraying concrete according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing a configuration of a rotary spraying machine according to a second embodiment of the present invention.

FIG. 3 is an exploded perspective view illustrating the configuration of the impeller device.

FIG. 4 is a sectional view showing an example of a conventional rotary spraying machine.

[Explanation of symbols]

 10, 70 Rotary spraying machine 11 Inside impeller 12 Outside impeller 13 Communication opening 14 Guide sleeve 15 Impeller device 16 Cylindrical casing (cylindrical body) 17 Outlet 18 Concrete supply pipe 19 Concrete 20 Quick-setting agent supply pipe 21 Quick-setting agent Supply sleeve 28 Rotating sleeve 29 Second quick-setting agent supply pipe 38, 40 Annular disk 42 Projection blade 44 Circular plate 46 Guide blade 50 Drive motor

Claims (2)

[Claims] 1. A method for spraying concrete by a rotary spraying machine, wherein concrete sent through a cylindrical body is projected to the outside of the impeller apparatus by an impeller apparatus provided at a tip end of the cylindrical body. Wherein the impeller device includes an inside impeller, an outside impeller, and a guide sleeve provided with a communication opening interposed therebetween, and the inside impeller passes through the communication opening of the guide sleeve from the inside impeller to the outside impeller. Concrete is supplied by a rotary spraying machine, wherein when the concrete is supplied and the outside impeller projects and sprays the concrete, the inside impeller mixes the concrete with the added liquid quick-setting agent. Method. 2. The method for spraying concrete by a rotary spraying machine according to claim 1, wherein the liquid quick-setting admixture is added to concrete stirred by an inside impeller.