JP3428438B2 - Concrete spraying machine - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a concrete spraying machine for lining concrete or the like on the inner surface of a tunnel or the like.

[0002]

2. Description of the Related Art As a means for lining the inner walls of tunnels, tunnels, cable ducts, etc. with concrete or mortar, conventionally, an air sprayer schematically shown in FIG. 6 has been used. This air spraying machine has a nozzle 1 connected to a concrete pump and an air pressure source, mixes a liquid quick-setting admixture with compressed air, blows out fresh concrete from the nozzle 1 with a large amount of compressed air, and at the same time in the nozzle. It mixes fresh concrete with a quick-setting admixture and sprays it on the inside of the tunnel. However, since such an air sprayer uses a large amount of compressed air, not only the power of the pneumatic source increases, but also dust containing fine concrete and a quick-setting agent contaminates the surroundings with a large amount of compressed air. There was a problem that the working environment was extremely bad.

In order to solve this problem, for example, Japanese Utility Model Publication No. 6-45519, "Projection construction apparatus", Japanese Patent Laid-Open No. 4-8.
No. 3096 and Japanese Patent Laid-Open No. 6-248887 “Mixture projecting method and apparatus” and the like have proposed a concrete spraying machine capable of lining without using compressed air.

FIG. 7 is a diagram showing the principle of such a concrete spraying machine. As shown in this figure, the head portion of these concrete spraying machines has an impeller 2 that rotates at high speed.
And a stirring screw 3 for supplying the concrete and the quick-setting agent to the impeller 2 while stirring, and the concrete is projected and sprayed in the tangential direction of the impeller by centrifugal force. Therefore, with this concrete spraying machine, concrete can be sprayed mechanically without using air at all, whereby the generation of dust can be eliminated and a good working environment can be obtained.

However, in the concrete spraying machine shown in FIG. 7, since the concrete mixed with the quick-setting agent is inside the head portion, even if the concrete is stopped for a short time due to interruption of work, the concrete is hardened inside. However, there was a problem that a mechanical failure occurred at the time of restart and the startup itself could not be performed. Therefore, it is necessary to disassemble and clean the interior every time the work is interrupted, the handling is complicated, and cleaning and maintenance take time. Further, since the stirring screw 3 and a drive unit (for example, a hydraulic motor) for driving the stirring screw 3 are indispensable to the head portion, the head portion becomes large and heavy, and the beam for moving the head portion, the hydraulic cylinder, and the like become large. there were. Further, in the concrete spraying machine of FIGS. 6 and 7, there is a problem that the speed of the concrete is largely decreased due to the discharge resistance of the nozzle portion. Furthermore, if the nozzle cross section is increased in order to reduce this decrease in speed, the projection angle of the concrete becomes too large. Moreover, in the conventional concrete spraying machine,
The nozzles and other parts were easily clogged with concrete, and their maintenance was difficult. Further, particularly in the concrete spraying machine using air in FIG. 6, there is a problem that the air acts as a cushion and the mixing of the concrete and the quick-setting agent tends to be insufficient.

In order to solve the above-mentioned problems, the same inventors as the present invention created and applied for a "concrete sprayer" schematically shown in FIG. 8 (Japanese Patent Application No. 9-2335).
No. 84, unpublished). This concrete spraying machine includes an impeller 12 that rotates at high speed around an axis, a casing 14 that surrounds the impeller with a space, and a concrete supply pipe that is provided in the casing and that supplies fresh concrete toward the center of rotation of the impeller. 16 and a concrete discharge pipe 1 provided in the casing adjacent to the concrete supply pipe 1
8 and a quick-setting agent supply nozzle 20 which is provided outside the open end of the concrete discharging tube and sprays the liquid quick-setting agent toward the concrete that has passed through the concrete discharging tube. The pipe 18 is a straight pipe having an axis inclined to the center side of the impeller from the rotation direction of the impeller orthogonal to the concrete supply pipe and having no change in cross section from the casing.
In this figure, 6 is a concrete pipe, 7 is fresh concrete, 8 is a quick-setting agent, and 13 is a blade.

In this concrete spraying machine, it is possible to suppress hardening of the concrete inside the head portion, which eliminates the need for cleaning and maintenance every time work is interrupted, and makes the head portion smaller and lighter. Can
As a result, the beam for moving the head, the hydraulic cylinder, etc. can be downsized, and the discharge resistance can be reduced and the speed reduction can be reduced while maintaining the spot property of concrete projection,
It has features such that concrete is unlikely to be clogged in each part, maintenance of the inside is easy, and the mixability of concrete and quick-setting admixture is high.

[0008]

However, it has become clear that the concrete spraying machine shown in FIG. 8 has the following problems. A few mm between the impeller side plate and the casing side plate
The concrete leaks through this gap.
The vicinity of the blade mounting position on the inner surface of the impeller side plate is easily worn. Blade of impeller is easily worn. The friction between the inner wall surface of the discharge pipe and the concrete is large, and the concrete projection speed decreases.

The present invention was devised to solve such problems. That is, the object of the present invention is to prevent the leakage from the gap between the impeller side plate and the casing with a wear resistant member, improve the wear resistance of the blade mounting surface of the inner surface of the impeller side plate, and also the blade end surface. It is an object of the present invention to provide a concrete spraying machine which has improved abrasion resistance and further reduces friction on the inner surface of the discharge pipe.

[0010]

In order to achieve the above object, in the invention of claim 1, an impeller rotating at a high speed about an axis, a casing surrounding the impeller with a space, and a casing provided in the casing. In a concrete spraying machine having a head portion having a concrete supply pipe for supplying ready-mixed concrete toward the center of rotation of the impeller, and a concrete discharge pipe provided in a casing adjacent to the concrete supply pipe, the impeller is , Axis of rotation
Two impeller side plates spaced apart in the line direction and between them
Circumferentially spaced and radially mounted compound
Number of blades, and the outer circumference of the inner surface of the impeller side plate
Wear-resistant tip is flush with the blade mounting position
It is attached.

According to the configuration of the present invention, the inner side of the impeller side plate is
Concrete is used at the blade mounting position on the outer circumference
Heavy wear causes dents. Therefore, wear resistance to this part
The surface of the abradable tip is flush with the inner surface of the impeller side plate.
To embed. This will prevent the formation of dents.
You can

The invention of claim 2 is in addition to the invention of claim 1.
Also, wear-resistant fins are provided on the outer peripheral edge of the impeller side plate.
Are arranged at intervals and inclined with respect to the radial direction.
It

Inclination in the radial direction on the outer peripheral edge of the impeller side plate
By arranging the wear-resistant fins,
Circle the concrete that goes into the gap between the side plate and the casing.
It is sent out in the circumferential direction and made to flow into the concrete discharge pipe. F
Since the tin is an abrasion resistant material, it does not grind against concrete.
Little wear. Also, by arranging the fins at an angle,
The rotational resistance of the impeller can be reduced.

In the invention of claim 3, claim 1 or claim 1
In addition to the invention of 2, the concrete of the blade hits
Wear-resistant tip is mounted flush with the outer edge in the radial direction
It has been removed.
Ncreet spraying machine.

The surface of the blade contacting the concrete is worn
Occurs. Especially the radial outer edge of the surface hit by concrete
The wear of the part is severe, so wear-resistant tip is
The surface that hits the concrete is the same as the surface of the other blade
To be installed. This prevents blade wear
You can stop.

According to the fourth aspect of the invention, the high-speed rotation is centered around the shaft center.
An impeller for rotation, cable surrounding at a interval the impeller
Thing and the center of rotation of the impeller provided in the casing
Supply pipe that supplies ready-mixed concrete to
And provided in the casing adjacent to the concrete supply pipe
With a concrete discharge pipe,
In concrete spraying machine,
Multiple openings are provided at the base of the tube.

In the vicinity of the root of the concrete discharge pipe, the discharged concrete hits the inner wall of the discharge pipe, and the concrete projection speed decreases due to frictional resistance. Therefore, by providing an opening at the root of the discharge pipe, outside air is carried along with the discharge concrete and enters along the inner wall of the discharge pipe, so the frictional resistance between the concrete and the inner wall is reduced, and the decrease in the projection speed of concrete is alleviated. , The projection performance is improved.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described below with reference to the drawings. In addition, in each figure, the common part is denoted by the same reference numeral, and the duplicated description will be omitted. FIG. 1 is a diagram showing a usage state of the concrete spraying machine of the present invention. In this figure, reference numeral 4 is a main machine, which has a traveling portion 4a and a concrete pump 4b provided on the rear side. A robot arm mechanism 5 is provided on the front side of the main machine 4. In this example, the robot arm mechanism 5 includes a main beam 5a, a swing cylinder 5c provided on a telescopic rod 5b of the main beam 5a, a direct acting cylinder 5d, and a base 5e provided at the rod tip of the direct acting cylinder 5e. Therefore, the head unit 10 can be moved to any position and direction.

2A and 2B are overall structural views of the concrete spraying machine head portion of the present invention. FIG. 2A is a front view with a part in section, and FIG. 2B is a sectional view taken along line XX in FIG. . Figure 2
As shown in (A), the head portion 10 of the concrete spraying machine according to the present invention includes an impeller 12, a casing 14, a concrete supply pipe 16, and a concrete discharge pipe 18. The impeller 12 includes two impeller side plates 12a that are spaced apart from each other in the axial direction of the rotation axis Z, and a plurality of impeller side plates 12a that are mounted between them and are spaced apart from each other in the circumferential direction (four in this figure).
The blade 13 of FIG. 2 is used to rotate at a high speed in the clockwise direction in this figure about the axis O by a drive device (for example, a hydraulic motor) not shown. The casing 14 surrounds the impeller 12 at intervals. Furthermore, concrete supply pipe 16
Is integrally provided on the upper part of the casing 14 and is connected to the concrete pump 4b through the concrete pipe 6 (see FIG. 1) so as to supply (pressurize) the fresh concrete 7 toward the rotation center of the impeller 12. Has become.

Further, as shown in FIG. 2 (A), the concrete discharge pipe 18 is provided adjacent to the concrete supply pipe 16 and integrally with the casing 14. The concrete discharge pipe 18 is a straight pipe that does not change in cross section from the casing 14, and is preferably a short pipe having a rectangular cross section. A plurality of discharge pipe openings 28 are provided on the side surface and the upper surface of the concrete discharge pipe 18, and when the concrete is discharged, the concrete discharge pipe openings 28 are entrained by the concrete and air is discharged from the discharge pipe openings 28 along the inner wall of the concrete discharge pipe 18. Since it comes in, the friction between the concrete and the inner wall is reduced,
The decrease in the projection speed of concrete is alleviated, and the projection performance is improved.

Further, as shown in FIGS. 2A and 2B, the outer peripheral edge of the impeller side plate 12a is inclined in the radial direction,
The outer surface fins 24 are provided so as to project from the outer surface. By rotating the impeller 12, concrete that flows in through a gap between the casing 14 and the impeller side plate 12 a is blocked and flows out from the concrete discharge pipe 18. By tilting the outer surface fins 24, the rotational resistance of the impeller is reduced. Further, since the outer surface fins 24 are made of a wear resistant material, the wear is small.

Further, as shown in FIG. 2 (A), the blade 13 is joined to the blade supporting member 13a by bolts 13b with the surface on which the concrete hits the radial direction. Both ends of the blade supporting member 13a are fixed to both impeller side plates 12a with bolts. Abrasion resistant blade end tips 22 are embedded on both end surfaces in the radial direction of the surface of the blade 13 that contacts the concrete so as to be flush with the blade surface. The wear of the blade 13 is concentrated on the outer end faces in the radial direction. However, by attaching the blade end tips 22 to both end faces, when one of the wear ends, the blade 1
By reversing and attaching the blade 3, the blade end tip 22 can be quickly replaced. In this way, the wear of the blade 13 can be reduced by embedding the blade end tip 22.

Further, as shown in FIGS. 2A and 2B, in the vicinity of the outer periphery of the inner surface of the impeller side plate 12a, a wear-resistant inner surface chip 26 is provided on the same surface as the inner surface of the impeller side plate 12a at the mounting position of the blade 13. Is embedded so that. Although the abrasion of the blade 13 due to the concrete is severe near the outer periphery of the inner surface of the impeller side plate 12a, the abrasion of the inner tip 26 having abrasion resistance can be reduced.

FIG. 3 shows a detailed structure of the outer surface fin 24.
(A) is a plan view, (B) is a sectional view taken along line XX of (A),
(C) is a YY sectional view of (A). Outer fin 24
The bottom surface of the has a step and the cross section has an inverse taper,
The impeller side plate 12a also has a shape corresponding to this,
There is some play between each other. Outer fin 2
Reference numeral 4 projects about 3 mm from the impeller side plate 12a. The outer fins 24 are made of sintered ceramics such as cemented carbide or silicon carbide, and all have excellent wear resistance. After the outer surface fins 24 are fitted into the impeller side plates, an adhesive is filled in the back and fixed. Since the adhesive is used at room temperature and does not require heating or the like, it does not cause material deterioration of the outer surface fins 24.

FIG. 4 shows the detailed structure of the inner chip 26.
(A) is a plan view, (B) is a sectional view taken along line XX of (A),
(C) is a YY sectional view of (A). Inner chip 26
The bottom surface of the has a step and the cross section has an inverse taper,
The impeller side plate 12a also has a shape corresponding to this,
There is some play between each other. Inner chip 2
6 and the upper surfaces of the impeller side plate 12a are flush with each other.

The inner tip 26 is made of sintered ceramics such as cemented carbide or silicon carbide and has excellent wear resistance. After the inner chip 26 is fitted in the impeller side plate, an adhesive is filled in the back and fixed. Since the adhesive is used at room temperature and does not require heating or the like, it does not cause material deterioration of the inner chip 26.

FIG. 5 shows the detailed structure of the blade end tip 22. (A) is a plan view and (B) is a view on arrow XX in (A). The lower surface shape of the blade end tip 22 has a plurality of stepped shapes, and the blade 13 has a shape corresponding to this, and a certain amount of backlash is provided between them. The blade surface and the blade end tip surface are flush with each other. The blade end tip 22 is made of cemented carbide and has excellent wear resistance. After the blade end tip 22 is fitted into the blade 13, an adhesive is filled in the back and fixed. Since the adhesive is used at room temperature and does not require heating, the material of the blade end tip 22 is not deteriorated.

The present invention is not limited to the above-mentioned embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

[0029]

As described above, the concrete spraying machine of the present invention has a blade mounting portion on the inner surface of the impeller side plate, and
And wear resistant inner tip and blade end
Since each is equipped with a cap, wear is prevented and durability is improved.
I was able to raise it. External fin, internal chip, blur
Attaching the tip of the card end is not by heat bonding with the base metal,
Since it is an embedding and adhesive filling joint, material deterioration can be prevented.
Wear. Furthermore, it is resistant to the gap between the impeller side plate and the casing.
Leaky fins are installed to prevent leakage of concrete through this gap.
Can prevent this and improve the durability of the fins
It was In addition, an opening is provided at the base of the discharge pipe to
Entrains air into the discharge pipe, and along the inner wall of the discharge pipe.
Form an air layer to reduce friction with concrete
This reduces the decrease in the projection speed of concrete and
Noh is improved.

[Brief description of drawings]

FIG. 1 is a view showing a usage state of a concrete spraying machine of the present invention.

FIG. 2 is a configuration diagram of a head portion of the concrete spraying machine of the present invention.

FIG. 3 is a detailed view of an outer surface fin.

FIG. 4 is a detailed view of an inner chip.

FIG. 5 is a detailed view of a blade end tip.

FIG. 6 is a schematic view of a conventional air spraying machine.

FIG. 7 is a configuration diagram of a head portion of a conventional concrete spraying machine that does not use air.

FIG. 8 is a schematic view of a head unit of an unpublished prior application.

[Explanation of symbols]

1 nozzle 2 impeller 3 stirring screw 4 main engine 5 Robot arm mechanism 6 Concrete pipe 7 ready-mixed concrete 8 quick-setting agents 10 head 12 impeller 12a Impeller side plate 13 blades 13a Blade support material 13b bolt 14 casing 16 Concrete supply pipe 18 Concrete discharge pipe 18a Inner end (scraper part) 20 Quick-setting agent supply nozzle 22 Blade end tip 24 outer fins 26 Inner chip 28 Discharge pipe opening

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP 63-600 (JP, A) JP 1-169099 (JP, A) JP 10-246097 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) E21D 11/10 E04G 21/02 103

Claims (4)

(57) [Claims] 1. An impeller that rotates at high speed around an axis,
A casing that surrounds the impeller with a space, a concrete supply pipe that is provided in the casing and that supplies fresh concrete toward the center of rotation of the impeller, and a concrete discharge pipe that is provided in the casing adjacent to the concrete supply pipe. In a concrete spraying machine having a head portion having, the impeller includes two sheets that are spaced apart in the axial direction of the rotating shaft.
And the impeller side plates of the
Consisting of multiple blades mounted in the radial direction,
The blade mounting position on the outer periphery of the inner surface of the impeller side plate
The wear-resistant tip is mounted flush with the
A concrete spraying machine to collect. 2. A wear resistance is provided on an outer peripheral edge of the impeller side plate.
Fins arranged at intervals with a tilt to the radial direction
The conch according to claim 1, characterized in that
Reet spraying machine. 3. The surface of the blade on which the concrete hits
Wear the wear resistant tip flush with the outer radial end of the
The concrete according to claim 1 or 2, characterized in that
Reet spraying machine. 4. An impeller rotating at high speed about an axis,
A casing surrounding the impeller with a space, and the casing.
Is installed on the wing and goes straight to the center of rotation of the impeller.
And a concrete supply pipe for supplying a cement
Concrete installed in the casing adjacent to the supply pipe
Spraying concrete with a head part having a discharge pipe
Machine, multiple openings are provided at the base of the concrete discharge pipe.
A concrete spraying machine characterized by