JPH0892964A - Method and equipment for ground stabilizing construction - Google Patents

Abstract

PURPOSE: To mix fibers uniformly without closing by fibers because fibers are mixed into a spraying material as isolated fibers, to adjust the quantity of fibers mixed freely and to facilitate the handling of an operator because of a single spraying nozzle in a method of ground stabilizing construction, in which the spraying material is sprayed while mixing fibers into the spraying material when the spraying material is sprayed against a ground surface by the spraying nozzle. CONSTITUTION: A fiber supply pipe 6 supplying a spraying-material supply pipe 2 to a spraying nozzle 1 with fibers together with compressed air is joined with the supply pipe 2. A fiber cutter 7 is incorporated on its midway of the fiber supply pipe 6, and fibers flowing in the fiber supply pipe 6 are cut in arbitrary length and the spraying nozzle 1 is supplied with fibers as isolated fibers.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground stabilization method and apparatus.

[0002]

2. Description of the Related Art Conventionally, as a spraying method for strengthening the ground such as a slope, spraying soil, mortars alone, or
Although the spraying material was sprayed with the lath wire mesh stretched on the slope, this method has a limit in terms of strength.For example, the sprayed material may run away due to rainfall or snow melting immediately after spraying and greening. The base material was eroded by running water.

Therefore, as a ground stabilization method, mixing continuous long fibers into mortar or the like as a spraying material is disclosed in Japanese Patent Publication No. 53-47602 and Japanese Patent Publication No. 55-167170. Such continuous filaments are bulky yarns made of glass, polyester, polyamide, acrylic, polyvinyl alcohol (including acetate compound), polypropylene, polyethylene, polyvinyl chloride, polyvinylidene chloride, acetate and other series resins. Is.

As a method of mixing the continuous long fibers into the blowing material, a continuous long fiber yarn is put on the flow of air or high-pressure water blown into the hollow pressure feeding passage, and a blowing nozzle provided at the end of the hollow pressure feeding passage. Discharge from the target portion from the, but when performing a simultaneous spraying with the spraying nozzle of the spraying material and the yarn feeding nozzle of continuous filament, and from the yarn feeding nozzle connected to the blowing nozzle with a flexible pipe, In some cases, the yarn discharged from the yarn supplying nozzle is guided into the blowing nozzle and discharged together with the blowing material.

[0005]

In the ground stabilization method in which such continuous long fibers are mixed in the spray material, the discharged fibers are easily gathered in one place because they rely on the feeling of the nozzle man. It is difficult to mix it uniformly in the spray material. It is also difficult to adjust the amount of fibers mixed.

Further, troubles such as cutting and entanglement of the continuous continuous fibers are likely to occur in the middle, which may cause thread clogging in the hose, and threading work for resuming work is also a handy task. It was troublesome to work.

There is also a method of spraying short fibers at the same time as spraying mortars. In this method, the spray nozzle main body and the short fiber discharge nozzle are configured as separate nozzles, and the weight and volume of the apparatus, etc. Will be large and unwieldy. Further, at the confluence point of the material sprayed from each nozzle and the short fiber, the fiber is splashed by the spraying pressure of the mortar, and it is difficult to mix the fibers uniformly, and there are many losses, which is economically disadvantageous.

The object of the present invention is to eliminate the disadvantages of the above-mentioned conventional example and to mix the fibers as independent fibers into the spraying material so that the fibers can be mixed uniformly without thread clogging, and the mixing amount can be freely adjusted. The nozzle is to provide a ground stabilization method and device that is easy for an operator to handle independently.

[0009]

In order to achieve the above-mentioned object, the present invention provides a ground stabilization method in which when a spray material is sprayed onto the ground surface by a spray nozzle, fibers are mixed into the spray material and sprayed. In the method, the fiber supply pipeline for supplying fibers together with compressed air and high-pressure water to the spray material supply pipeline for the spray nozzle is joined,
By incorporating a fiber cutting machine in the middle of this fiber supply line, cut the fiber flowing through the fiber supply line to an arbitrary length and supply it to the spray nozzle as an independent fiber, and a fiber cut to an arbitrary length Is an extremely short fiber of about 2 cm to 6 cm, or a short fiber of about 6 cm to 100 cm, the fiber is a steel fiber, or the fiber is a synthetic fiber and the spraying material is The gist is that it is a greening base material.

As a ground stabilizing device, a fiber supply pipeline for supplying fibers together with compressed air and high-pressure water is joined to a spray material supply pipeline for a spray nozzle of a spray material, and the fiber is supplied in the middle of the fiber supply pipeline. Incorporating a cutting machine,
Further, it is a gist that the confluent portion of the fiber supply pipe is the spray nozzle body.

[0011]

According to the present invention as set forth in claims 1 and 6, since the continuous fiber supplied by the fiber cutting machine is supplied to the spray nozzle together with the spray material, the continuous continuous fiber to be supplied is cut in the middle. There is no need to worry about the trouble that occurs, and because it is an independent fiber, it can be mixed uniformly in the spray material.

Moreover, the amount of independent fibers to be supplied can be freely adjusted by the conveying speed of compressed air or high-pressure water in the fiber supply pipe and the cutting interval of the fiber cutting machine, and as a result, the aspect ratio can be freely determined. .

Further, since it is not necessary to separately provide a fiber discharge nozzle in addition to the spray nozzle, it is easy to handle.

According to the present invention as set forth in claims 2 and 4, since the fibers cut to an arbitrary length are short fibers of about 2 cm to 6 cm, so-called steel fibers such as steel fibers are used as mortar. It is also possible to mix it in the spray material, and by increasing the aspect ratio freely, it is possible to increase the various strengths and toughnesses of the steel fiber reinforced concrete without impairing the workability.

According to the present invention as set forth in claims 3 and 5, the fibers cut to an arbitrary length are short fibers of about 6 cm to 100 cm, and synthetic fibers are used as a spraying material which is a greening base material. Suitable for mixing.

According to the present invention of claim 6, it is easy to handle because it is not necessary to separately provide a fiber discharge nozzle in addition to the spray nozzle as the device.

According to the present invention as set forth in claim 7, since the confluent portion of the fiber supply pipe is the spray nozzle body, the device becomes more compact.

[0018]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is an explanatory view showing an embodiment of an apparatus used in the ground stabilization method of the present invention, in which 1 denotes a spraying nozzle for spraying material.

A spraying material supply pipe 2 by a pressure-resistant hose is connected to the spraying nozzle 1, and when the spraying material is mortar, a mortar pump 3 is arranged in the middle of the spraying material supply pipe 2 and further the spraying material is supplied. The end of the tube 2 is connected to the mortar mixer 4.

Further, a fiber insertion portion is provided in the middle of the compressed air pipe from the compressor 5, and this compressed air pipe is connected to the blowing nozzle 1 as a fiber supply pipe 6 for supplying the fiber with the compressed air. A fiber cutting machine 7 is arranged in the insertion part of the fiber, continuous fibers are introduced from the fiber supply device 8 in which a bobbin 8a and the like are arranged to the fiber cutting machine 7, and the independent fibers cut by the fiber cutting machine 7 are It shall be sent to the supply pipe 6.

The fiber cutting machine 7 may be a roving cutter, a vertical cutting blade, or a heat cutter, which may be of any type, but the fiber cutting length may be freely changed. Be able to

Further, the compressed air pipe 9 from the compressor 5 is directly connected to the spray nozzle 1, and the compressed air pipe from the compressed air pipe 9 is added to the spray material from the spray material supply pipe 2 to force the spray material. I am trying to eject.

The fiber supply pipe 6 and the spray material supply pipe 2
Means that a Y-shaped joint is provided on the main body of the spray nozzle 1 and a merging connection is made at this joint.

The fibers supplied by the fiber supply device 8 are glass fiber, polyester, polyamide, acrylic, polyvinyl alcohol (including acetate compound),
It can be appropriately selected from various series of synthetic resin fibers such as polypropylene, polyethylene, polyvinyl chloride, polyvinylidene chloride and acetate, steel fibers, carbon fibers, paper fibers, animal fibers and the like according to the application.

In this way, the independent fibers cut by the fiber cutting machine 7 at the spraying nozzle 1 are mixed with the mortar sent from the mortar mixer 4 through the spraying material supply pipe 2 by the mortar pump 3. The mortar containing fibers is discharged from the spray nozzle 1 and sprayed onto the ground surface.

The length of the fiber cut by the fiber cutting machine 7 differs depending on the kind of the fiber used, and is 6 for synthetic resin fiber or the like.
Use short fibers of about cm to 100 cm.

Further, it is desirable that the steel fiber is a very short fiber of about 2 cm to 6 cm. This allows the spray material to be constructed as steel fiber concrete.

As yet another embodiment, the spray material may be a greening base material. An example of this greening base material is a mixture of cement, earth and sand and seeds, or a mixture of seeds and organic materials, but a combination of beet moss, park fertilizer and sand is also possible.

When such a green base material is used as a spraying material, steel fibers are unsuitable, but other fibers, synthetic resin fibers, etc., even 6 cm to 100 cm even for extremely short fibers of about 2 cm to 6 cm.
Even short fibers may be selected according to the situation.

In the above embodiment, the compressed air from the compressor 5 is used, but a high pressure pump is used instead of the compressor 5, and high pressure water is used instead of the compressed air to discharge the fibers. It may be done.

[0031]

As described above, in the ground stabilization method and apparatus of the present invention, the fibers are mixed as independent fibers into the spraying material, so that the fibers can be mixed uniformly without thread clogging, and
The mixing amount can be freely adjusted, and since the nozzle is independent, it is easy for the operator to handle.

[Brief description of drawings]

FIG. 1 is an explanatory view showing one embodiment of an apparatus used in the ground stabilization method of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Spraying nozzle 2 ... Spraying material supply pipe 3 ... Mortar pump 4 ... Mortar mixer 5 ... Compressor 6 ... Fiber supply pipe 7 ... Fiber cutting machine 8 ... Fiber supply device 8a ... Bobbin 9 ... Compressed air pipe

Claims (7)

[Claims] 1. A ground stabilization method in which fibers are mixed into a spraying material when spraying the spraying material onto the ground surface with a spraying nozzle, and in the spraying material supply pipeline to the spraying nozzle, the fiber is mixed with compressed air and high-pressure water. The fiber supply pipes for supplying the fibers are joined together, and a fiber cutting machine is installed in the middle of the fiber supply pipes to cut the fibers flowing through the fiber supply pipes into arbitrary lengths and supply them as independent fibers to the spray nozzle. Ground stabilization method characterized by. 2. The fibers cut to an arbitrary length are 2 cm to 6 cm.
The ground stabilization method according to claim 1, which is an ultrashort fiber having a size of about cm. 3. A fiber cut into an arbitrary length has a length of 6 cm to 10 cm.
The ground stabilization method according to claim 1, which is a short fiber of about 0 cm. 4. The ground stabilization method according to claim 1, wherein the fibers are steel fibers. 5. The ground stabilization method according to claim 1, wherein the fiber is a synthetic fiber and the spray material is a greening base material. 6. A fiber supply conduit for supplying fibers together with compressed air and high-pressure water is joined to a spray material supply conduit for a spray material spray nozzle, and a fiber cutting machine is incorporated in the middle of the fiber supply conduit. A ground stabilization device characterized in that 7. The ground stabilization device according to claim 6, wherein the confluence of the fiber supply line is the spray nozzle body.