JP3297009B2 - Mortar and concrete spraying equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete mortar and a concrete spraying apparatus.
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spraying device which can selectively spray mortar or concrete with a single device and can mix fibers as needed.

[0002]

2. Description of the Related Art In a small section tunnel such as a headrace tunnel, when section repair is required, especially when the repair thickness is large, it is necessary to spray concrete to suppress cracking.

However, when spraying concrete, it is difficult to level the surface. Therefore, conventionally, leveling has not been performed after the concrete has been sprayed, or mortar has been sprayed and leveled to a smooth surface by plastering.

[0004] A spraying device used for this type of spraying includes a pressure feeding pipe and a blowing nozzle attached to the tip thereof, and the kneaded concrete is fed into the pressure feeding pipe by compressed air, and the tip of the blowing nozzle is sprayed. The structure was such that a quick-setting agent was added and supplied just before the concrete was injected from.

[0005] However, such a spraying device has the following problems.

[0006]

That is, when mortar and concrete are switched as required when repairing a cross section, or after spraying concrete,
In the case where mortar is to be sprayed on the upper surface of concrete, or when mortar is sprayed on the groundwork before concrete is sprayed, it is difficult to use a separate spraying device for spraying work such as a small-section tunnel. It is desirable that both the concrete and the mortar be sprayed with the spraying device of the table.

However, if one of the spraying apparatuses attempts to spray concrete and mortar, it is necessary to clean and remove one of the materials remaining in the pressure feed pipe once, and then spray the other material. Can not be used for

[0008] Such a cleaning operation takes time and effort, and has been one of the causes of a reduction in efficiency of the spraying operation.

The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a mortar and concrete spraying apparatus capable of improving the efficiency of spraying work. To provide.

[0010]

In order to achieve the above-mentioned object, the present invention comprises a spray nozzle having a spray opening formed at a tip end thereof, which is required for mortar or concrete sprayed from the nozzle. In a mortar / concrete spraying apparatus to which a quick-setting agent is added, a coarse aggregate pumping pipe is provided in the spray nozzle for feeding coarse aggregate through a different path from the mortar, and when the mortar is sprayed, ,Previous
Stop feeding the coarse aggregate and spray the concrete
In this case, the coarse aggregate is pumped through the coarse aggregate pumping pipe.
So that the coarse aggregate is selectively supplied to the inner pipe.
I did it. According to the mortar / concrete spraying device configured as described above, the coarse aggregate mixed into the mortar can be supplied from the coarse aggregate pumping pipe as needed, so that the spraying is performed by one spraying device. Can spray mortar and concrete. In this case, even if the coarse aggregate remains in the coarse aggregate pumping pipe, the coarse aggregate alone does not solidify, so that there is no problem even if the coarse aggregate is left as it is, and there is no need for cleaning. In the spraying device capable of arbitrarily performing such two types of spraying, the nozzle has a spraying nozzle body having an open end, and both ends having one end provided on a central axis in the nozzle body. An inner pipe, forming a supply path of the mortar between an inner peripheral face of the nozzle body and an outer peripheral face of the inner pipe, and the coarse aggregate pumping pipe at the other end of the opening of the inner pipe. It can be configured by connecting. In this case, a branch pipe connected to the inner pipe may be provided, and the reinforcing fiber cut from the branch pipe may be supplied alone or together with the coarse aggregate. According to this configuration, a fiber-reinforced mortar or a fiber-reinforced concrete layer can be spray-formed on a repair cross section or the like. Further, the inner pipe can be provided slidably with respect to the nozzle body along the axial direction. According to this configuration, by sliding the inner tube, the contact distance of the mortar and the coarse aggregate formed between the opening of the nozzle body and the opening of the inner tube can be changed. Further, when the concrete is sprayed on the inner pipe, an opening in the nozzle body can be arranged behind an inlet of the mortar supply path. According to this configuration, the crushed mortar that rises at the injection port comes into contact with the compressed aggregate that has been fed, and the mortar is cut with the coarse aggregate, cut out, and coated with the mortar. Therefore, the mixing efficiency of the mortar and the concrete is improved.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG.
1 shows an embodiment of a mortar and concrete spraying apparatus according to the present invention.

The spraying device shown in FIG. 1 includes a spraying nozzle 10, a mortar supply pump 12, a quick-setting agent supply pump 14, an aggregate supply device 16, and a reinforcing fiber supply device 18. .

The spray nozzle 10 has a hollow cylindrical spray nozzle body 20 having a spray opening 20a formed at the front end and a rear end closed by an end plate 20b, and a center of the spray nozzle main body 20. And a hollow cylindrical inner tube 22 arranged in a shaft shape.

On the outer periphery of the tip side of the spray nozzle body 20,
A sheath tube 26 forming an annular quick-setting agent supply passage 24 is provided. The sheath tube 26 is mounted so that its tip projects slightly forward from the tip edge of the nozzle body 20, and a ring-shaped opening between the sheath tube 26 and the tip edge of the nozzle body 20 forms an outlet 24 a for the quick-setting agent. Has become.

The inner tube 22 has both ends open, and is installed so as to penetrate the end plate 20b on the rear end side of the spray nozzle body 20, and the opening on one end side is located on the back side of the spray opening 20a. Is disposed inside the nozzle body 20 so as to be located at the position.

A mortar supply passage 28 is formed inside the spray nozzle body 20 between an inner peripheral surface thereof and an outer peripheral surface of the inner pipe 20. The mortar supply passage 28 has a mortar supply port 30. Are connected.

The mortar supply port 30 and the mortar supply pump 12 are connected by a mortar pumping pipe 32. The coarse aggregate feeding pipe 34 is connected between the other end side opening of the inner pipe 22 and the coarse aggregate supply device 16.

A branch pipe 36 is provided in the middle of the coarse aggregate pumping pipe 34 connected to the inner pipe 22. The branch pipe 36 and the reinforcing fiber feeder 18 are connected by a reinforcing fiber pumping pipe 38. I have. Quick-setting agent supply passage 24 formed in sheath tube 26
The quick-setting agent supply pump 14 is connected to the quick-setting agent supply pump 14 by a quick-setting agent pumping pipe 40.

Compressed air is supplied to the coarse aggregate feeder 16 and the reinforcing fiber feeder 18 via a compressor 42, respectively.

The hopper of the mortar supply pump 12 includes:
Mortar A, such as premix, which has been adjusted in advance
Is input. In some cases, a mixing agent B such as a resin emulsion mixed therein is introduced, and the mortar C kneaded with the mixing agent B is supplied through a mortar pressure feeding pipe 32 to a mortar supply path 28 in the spray nozzle body 20. And is sent out to the tip end side of the nozzle body 20 through the supply path 28.

A quick-setting agent D such as calcium aluminate is supplied to the hopper of the quick-setting agent supply pump 14, and the supplied quick-setting agent D is supplied to the quick-setting agent D in the sheath tube 26 via a pressure pipe 40. It is pressure-fed to the supply path 24, passes through the supply path 28, and is added to the mortar C or the concrete sprayed from the tip of the nozzle body 20 from the inlet 24 a.

In this embodiment, since the liquid quick-setting agent D is employed, it is added from the tip of the nozzle body 20. However, the quick-setting agent D is not limited to a liquid, The addition position is not limited to the tip of the nozzle body 20 either.

On the other hand, the hopper of the coarse aggregate feeder 16
The coarse aggregate E, which has been subjected to particle size adjustment in advance, is supplied, and the coarse aggregate E is sent to the coarse aggregate pumping pipe 34 by adjusting the rotation speed and the pressure of the compressed air in accordance with the set mixing ratio. Is done.

The coarse aggregate E pumped in the pumping tube 34 passes through the mortar supply path 28 via the inner tube 22 and is mixed into the mortar C delivered to the tip end side of the nozzle body 20. .

The reinforcing fiber feeder 18 cuts a reinforcing fiber F such as vinylon or glass fiber into a predetermined length and sends it to a reinforcing fiber pumping tube 38. F is delivered into the coarse aggregate pumping pipe 34 via the branch pipe 36.

At this time, the supply amount of the reinforcing fiber F is controlled by adjusting the rotation speed of the reinforcing fiber feeder 18 according to the set volume%. The reinforcing fibers F may be not only short fibers but also long fibers.

When the mortar C is sprayed on a repair section or the like by the spraying apparatus configured as described above, the mortar supply pump 12 and the quick-setting agent co-supply pump 14 are driven, and the coarse aggregate supply machine 16 is operated. And the reinforcing fiber feeder 18 is brought into a stopped state.

In this case, when spraying the fiber reinforced mortar, the reinforcing fiber feeder 18 may be driven.

When the spraying device is operated in such a driving state, the one obtained by adding the quick-setting agent D to the mortar C from the tip of the nozzle body 20 or the one obtained by adding the reinforcing fiber F thereto is sprayed. .

On the other hand, when the concrete is to be sprayed on the repair section or the like by the spraying device, the mortar supply pump 12, the quick-setting agent co-supply pump 14, the coarse aggregate supply device 16 and the reinforcing fiber supply device 18 are driven.

When the spraying apparatus is operated in such a driving state, the mortar C is mixed with the coarse aggregate E and the reinforcing fibers F, and the quick-setting agent D is added thereto.

When it is not necessary to mix the reinforcing fibers F, the driving of the reinforcing fiber feeder 18 may be stopped.

According to the spraying device constructed as described above, the coarse aggregate E to be mixed with the mortar C is supplied to the inner tube 22 as necessary. If not supplied, mortar C will be sprayed,
When the coarse aggregate E is supplied from the inner pipe 22, the concrete is sprayed. By selectively supplying the coarse aggregate E to the inner pipe 22, the mortar C and the concrete are sprayed by one unit. It becomes possible with a spraying device.

In this case, the coarse aggregate remaining in the inner tube 22 does not harden, so that even if it is left as it is, there is no problem of blockage in the tube, and there is no need for cleaning. Can be improved.

In general, it is known that concrete spraying containing coarse aggregate has a large amount of material rebound, and mortar containing no coarse aggregate has a small amount of material rebound.

From the above, at the start of spraying, the base is made by spraying mortar with little rebound, and thereafter, switching to concrete spraying with a small shrinkage rate is performed, and finally, switching to mortar spraying with easy finishing is performed again. As a result, it is possible to reduce the waste of materials and to construct a structure having a good finished appearance.

The spraying apparatus of the present invention is extremely effective when such mortar spraying and concrete spraying are repeated a plurality of times at the same construction site.

Further, when pumping concrete,
Although a large compressor and a large-diameter pipe are required, in the present invention, the coarse aggregate E is independently pumped without mixing the coarse aggregate E into the mortar C.
2 can be small, and the pipe 32 can be small in diameter.

In this embodiment, a coarse aggregate pumping pipe 34 connected to the inner pipe 22 and a branch pipe 36 are provided.
Since the reinforcing fiber F cut from is supplied, a fiber-reinforced mortar or a concrete layer can be spray-formed on a repaired section or the like.

FIGS. 2 and 3 show another embodiment of the mortar and concrete spraying apparatus according to the present invention, in which the same or corresponding parts as those in the above embodiment are denoted by the same reference numerals and the description thereof will be omitted. A description thereof will be omitted, and only the characteristic points will be described below.

In the embodiment shown in FIG.
No. 0a includes a nozzle body 20, an inner tube 20a, and a sheath tube 26. On the rear end side of the nozzle body 20, a cylindrical guide cylinder 20c is provided.

The inner tube 20a is fitted and inserted into the guide tube 20c so as to be slidable along the axial direction of the nozzle body 10a. The spray nozzle 10a thus configured
Then, when spraying the mortar C, as shown in FIG. 2, the inner pipe 22a is slid to the rear so that the opening end in the nozzle main body 10a is located near the distal end opening of the main body 10a. .

When the mortar c is sprayed in such a state, the mortar supply passage 28 and the opening of the nozzle body 10a are close to each other, so that the flow rate of the mortar C does not decrease.
Can be sprayed.

On the other hand, when the concrete is sprayed, as shown in FIG. 3, the opening end of the inner pipe 22a in the nozzle body 10a is located on the near side so as to be located behind the injection port 30 of the mortar C. Move the slide.

When the coarse aggregate E and the reinforcing fibers F are supplied to the inner tube 22a in such a state, the nozzle body 10 of the inner tube 22a
a, and the distance between the opening end in the nozzle body 10a and the tip opening of the nozzle body 10a becomes longer, and the contact distance between the mortar C, the coarse aggregate E, and the reinforcing fiber F becomes longer, and the contact time between the two is sufficiently ensured. In addition, mixing between the two can be sufficiently performed.

When the opening end of the inner tube 22a is positioned behind the injection port 30 of the mortar C, the coarse aggregate E fed into the mortar C swells at the injection port 30 so as to collide with the mortar C. C is cut with coarse aggregate E and cut out,
Coarse aggregate E can be coated with mortar C,
It is possible to improve the mixing state between the two. In addition,
Even in the case of concrete spraying, as shown in FIG.
Spraying is possible with 2a slid to the back side.

[0047]

As described above in detail in the embodiments,
ADVANTAGE OF THE INVENTION According to the mortar and concrete spraying apparatus which concerns on this invention, since mortar or concrete can be selectively sprayed by one apparatus without cleaning, construction efficiency can be improved significantly.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing one embodiment of a mortar and concrete spraying apparatus according to the present invention.

FIG. 2 is an explanatory view of a mortar and concrete spraying state showing another embodiment of the mortar and concrete spraying apparatus according to the present invention.

FIG. 3 is an explanatory view of a concrete spraying state showing another embodiment of a mortar and concrete spraying apparatus according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Spray nozzle 12 Mortar supply pump 14 Quick binder supply pump 16 Coarse aggregate supply machine 18 Reinforcement fiber supply machine 20, 20a Nozzle main body 22, 22a Inner pipe 24 Quick binder supply path 26 Sheath pipe 28 Mortar supply path 32 Mortar Pumping tube 34 Coarse aggregate pumping tube

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Koichiro Sawa 2-3 Kandajicho, Chiyoda-ku, Tokyo Tokyo Main Office, Obayashi Corporation (72) Inventor Ikuo Yamashiro ▲ min ▼ 3-15 Nakakasai, Nakagasai, Edogawa-ku, Tokyo -7 Inside J Feck Co., Ltd. (72) Keiichi Yoshida, Inventor 3-15-7 Nakakasai, Edogawa-ku, Tokyo Inside J Feck Co., Ltd. (56) References JP-A-55-114756 (JP, A) JP-A-63-206571 (JP, A) JP-A-9-268889 (JP, A) JP-A-7-261007 (JP, A) Japanese Utility Model Application Showa 57-199664 (JP, U) Japanese Utility Model Application Model No. 7-9449 (JP) , U) (58) Fields surveyed (Int. Cl. ⁷ , DB name) E21D 11/10 B05B 7/02

Claims (5)

(57) [Claims] 1. A mortar / concrete spraying apparatus comprising: a spray nozzle having a spray opening formed at a tip end thereof; and a mortar or concrete sprayed from said nozzle to which a quick setting agent is added as required. When the blasting nozzle is provided with a coarse aggregate pumping pipe for pumping coarse aggregate through a different path from that of the mortar,
Stop the pumping of the coarse aggregate and remove the concrete
When spraying, the coarse aggregate is passed through the coarse aggregate pumping pipe.
To select the supply of coarse aggregate to the inner pipe.
A mortar / concrete spraying apparatus characterized in that the spraying is performed in a typical manner . 2. The nozzle includes: a spray nozzle main body having an open front end; and an inner pipe having both ends open, one end of which is disposed on a central axis in the nozzle main body, and an inner periphery of the nozzle main body. The supply passage of the mortar is formed between a surface and an outer peripheral surface of the inner pipe, and the coarse aggregate pumping pipe is connected to the other end of the opening of the inner pipe. Mortar and concrete spraying equipment. 3. The mortar according to claim 2, wherein a branch pipe connected to the inner pipe is provided, and continuous or cut reinforcing fibers are supplied from the branch pipe alone or together with the coarse aggregate. Concrete spraying equipment. 4. The nozzle according to claim 1, wherein the inner pipe is
4. The mortar and concrete spraying device according to claim 2, wherein the mortar and concrete are slidably provided along the axial direction. 5. The mortar according to claim 4, wherein the inner pipe arranges an opening in the nozzle body behind an injection port of the mortar supply path when the concrete is sprayed. ， Concrete spraying equipment.