JP2879477B2 - Ground stabilization method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for stabilizing a material containing continuous fiber yarn by spraying the material on a slope or the like.

[0002]

2. Description of the Related Art A problem often encountered in a slope spraying method is that a sprayed material flows away due to rainfall or the like. In the case of spraying a greening base material, the material is eroded from the surface by flowing water.

[0003] For this reason, in the case of a greening base material, it is known that natural organic fibers such as peat moss and bark compost are mixed into the material. However, even if this measure is taken, even if it is effective in preventing early runoff, it will be ineffective in the long term due to disappearance of maturity. It has been proposed that mixed short fibers such as acrylic fiber be mixed into the greening base material.

[0004] Although it is practically effective to prevent runoff by entanglement of each short fiber, it is difficult to sufficiently cope with a case in which a wide range of collapse occurs at once. Also,
A considerable amount of fiber must be mixed in order to achieve the effect of preventing runoff, which is not economical.

On the other hand, it is also known to mix continuous fiber yarns. For example, Japanese Patent Publication No.
No. 47602 discloses that continuous fiber yarn is rolled on a slope together with a spray material. Also, Japanese Unexamined Patent Publication No.
No. 167170 also teaches that continuous fiber yarn is mixed with mortar and sprayed.

The incorporation of continuous fiber yarn into the sprayed material has a great effect of preventing run-off, and is particularly remarkable in the effect of preventing run-off over a wide range. In terms of the characteristics to be obtained, advantages such as a reduction in the amount of spray per target area are provided.

However, according to the conventional continuous fiber yarn feeding device, even if the continuous fiber yarn can be pneumatically fed in principle, it is extremely difficult to feed the continuous fiber yarn over a long distance.

For example, the above-mentioned Japanese Patent Application Laid-Open No. 55-167170.
In FIG. 4 of the publication, a tapered water jet nozzle is coaxially provided inside a tapered tube as a pressure-feeding nozzle, and a thread-like member is guided forward of the tapered tube from a gap between the tapered tube and the nozzle. Known is a structure in which water is pumped on the water by the water jetting force from the tip.However, when the present inventors actually experimented, it was impossible to stably pump over long distances. found. Further, even when the continuous fiber yarn was passed through the nozzle and compressed air was supplied and conveyed between the nozzle and the tapered tube, the situation did not substantially change.

On the other hand, the worker loads the bobbin of the continuous fiber yarn with the shoulder or installs the bobbin near the spraying point,
Many proposals have been made for introducing a continuous fiber yarn derived from the bobbin into an injection nozzle, and injecting this together with the spray material from the injection nozzle to a spray target near the nozzle and a device suitable for it. For example, it is disclosed in Japanese Patent Publication No. 1-49661, JP-A-1-310019, JP-A-2-74732, and JP-A-2-49811. In contrast, the present applicant has disclosed in
No. 177721 and Japanese Patent Application Laid-Open No. 2-232421 have proposed a device suitable for carrying a continuous fiber yarn in a long carrying pipeline and carrying it.

[0010]

SUMMARY OF THE INVENTION The continuous fiber yarn conveying device proposed by the present applicant has a higher work efficiency than a case where a worker carries out a spraying operation while carrying a bobbin on an inclined surface which is a slope. The burden on members is significantly reduced,
As for the setup such as thread change upon completion of use of one bobbin, the setup can be performed on the ground, which is extremely advantageous in terms of workability and the like.

Further, it is too burdensome for an operator to carry out a spraying operation while carrying a large number of bobbins on an inclined surface which is a slope shown in the conventional example. On the other hand, as in the present invention described later, it is preferable that the continuous fiber yarn be conveyed by air under pressure.

Accordingly, a main object of the present invention is to improve the mixing uniformity of continuous fiber yarns, especially when a greening material is used.

[0013]

SUMMARY OF THE INVENTION The object of the present invention is to convey a ground improvement material mainly through one of the hollow pressure-feeding conduits and eject it from the tip thereof or from a spray nozzle provided at the tip thereof. The continuous fiber yarn is put on the flow of air by compressed air that blows the inside into the inside, and is discharged from the pressure feeding guide path or the spray nozzle provided at the tip thereof, and the discharge direction is set with respect to the flow mainly of the improved material. The problem can be solved by intersecting and discharging the discharged fiber yarns on the flow of the improvement material and spraying the fiber yarns as an integral material on the surface to be improved.

[0014]

According to the present invention, continuous fiber yarn is conveyed by air through the hollow pressure feeding guide path and is ejected from its tip or a spray nozzle so as to intersect with the flow mainly of the ground improvement. And is sprayed on the target surface so as to accompany the center of the flow.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

FIG. 1 shows an example of a spraying state suitably applied to a greening base material, wherein 1 is a spraying nozzle, and a spraying material main body M is pressure-fed through a hose 3 from a stirrer 2A by a pressure pump 2B. Then, it is sprayed from a spray nozzle 1 at the tip onto a target surface, for example, a slope G.

On the other hand, the continuous fiber yarn 5 of polypropylene or the like is wound, for example, in the form of a cone.
And is bundled in the process of passing through the ring guide 7, and thereafter supplied as a single fiber yarn bundle, and thereafter, is passed through the reel 8 and introduced into the pressure feeding nozzle 10A, and is compressed by the compressor 4A and the other compressor 4B. The fiber is ejected from the distal end through a fiber pressure feeding hose 9A as a hollow pressure feeding guide path and a pressure feeding hose 9B connected to the fiber pressure feeding hose 9A. The tip of the hose 9B is integrated with the spray nozzle 1 by a stopper 11, and
The jetting direction of B intersects with the jetting direction of the spray material M from the spray nozzle 1. In FIG. 1, the fiber feeding hoses 9 </ b> A and 9 </ b> B are illustrated as being located below the spray nozzle 1, but it is preferable that they are actually located above the spray material M from the viewpoint of merging with the spray material M.

The reel 8 has its rotating shaft connected to a pulse generator 12 or the like, and counts the number of pulses. Based on a known reel diameter, the running speed of the continuous fiber yarn bundle 5 and therefore the continuous fiber The ejection amount of the yarn bundle 5 is detected, and the ejection amount is controlled. In order to control the ejection amount, for example, the air flow from the compressors 4A and / or 4B is adjusted by the flow control valves 13A and / or 13B, the pressure itself of the compressors 4A and / or 4B is adjusted, This can be performed by adjusting the supply speed of the fiber yarn bundle with a brake (not shown) provided at an appropriate position up to the nozzle 10A.

The detected traveling speed of the fiber yarn bundle 5 can be adjusted by adjusting the amount of the spray material M sprayed on the basis of the detected running speed. It can be used effectively for adjustment.

FIG. 2 shows a specific example of the pressure feeding nozzles 10A and 10B. This pressure-feeding nozzle comprises a main body 20 and a pipe 21 which is screwed into the main body 20 and whose screwing position is adjustable. The main body 20 is provided with an air supply hole 22 perpendicular to the axis of the pipe 21. An axially elongated header chamber 23 is formed between the end of the supply hole 22 and the outer surface of the rear end of the pipe 21, and the header chamber 23 is formed between the end face of the pipe 21 and the side wall of the header chamber 23. And the communication passage 2 of the main body 20 through a ring-shaped compressed air introduction port 24B formed by a ring-shaped compressed air introduction port 24A formed between the tapered surface at the end of the pipe 21 and the front convex portion 20a of the body 20.
0A and the communication path 21A of the pipe 21.

The communication passage 20A of the main body 20 is tapered except for the front portion, and the communication passage 21A of the pipe 21 is
From the tapered surface of the constriction, it gradually expands like a trumpet. As a result, a substantially Venturi tubular communication path is formed.

Prior to the transport of the fiber yarn bundle 5, the leading end of the fiber yarn bundle 5 is threaded through the inside of the pressure feeding nozzle. Next, when compressed air is supplied from the air supply hole 22, the air once goes around the entire circumference in the header chamber 23, and has a uniform flow rate and the ring-shaped compressed air introduction port 24.
A is ejected through A and 24B. At this time, since the widths of the compressed air introduction ports 24A and 24B are narrow, the air is blown into the communication passage obliquely forward with respect to the axis of the communication passage in a state where the air flow velocity is extremely increased. Along with this ejection, the pressure around the communication passage 21A is high and the central portion is reduced, and as a result, a large amount of surrounding air is entrained from the entrance of the communication passage 20A,
With a flow rate many times the amount of air supplied from the compressor 4B, and at an increased flow velocity, the air flows toward the tip. By the pressure feeding of the air, the fiber yarn bundle 5
Is carried along. In this case, the minimum diameter d shown in FIG. 2 is 3 mm or more, preferably 5 mm or more. This is in contrast to the conventional method in which the fiber is conveyed through a very small nozzle inner diameter.

The continuous fiber yarn bundle 5 thus fed under pressure
Is ejected from the tip of the hose 9B. The jetted fiber yarn bundle 5 is drawn into the flow of the spray material M jetted from the spray nozzle 1 and is accompanied by the jet, and is sprayed on the target slope G. As a result, the continuous fiber yarn bundle 5
In a state where the fiber yarn bundles are separated and each fiber yarn is formed, a slope stabilizing layer mixed in a random state is formed.

For fine adjustment of the ejection state of the spray material main body M,
For example, as shown in FIG. 3, the adjustment can be performed by the adjusting device 30 attached to the tip of the spray nozzle 1. Spray nozzle 1
Has a rubber nozzle 1A only at its tip, and a mounting ring 31 is fixed around the rubber nozzle 1A.
2 and 33 are pivotally mounted, and the main body handle 3 is attached to the lower clamping plate 33.
The rotating plate 35 is rotatably connected to the main body handle 34 by a pin 36 so as to be rotatable. The other end of the rotating plate 35 is connected to the upper holding plate 32 by a connecting rod 37. 3
Reference numeral 8 denotes an operation handle integrated with the rotary plate 35.

At the time of adjustment, if the operating handle 38 is pulled in the X direction with respect to the main body handle 34, the rotating plate 35 rotates about the pin 36, so that the upper clamping plate 32 is rotated about the pin 39. And rotate the clamping plates 32 and 33
As a result, the tip end of the rubber nozzle 1A is narrowed, and the spray material scatters in a fan shape and flies far. Conversely, if the space between the handles 34 and 38 is enlarged, that is, if the grip of the handle 38 is loosened, the spray material M is ejected in a columnar shape to fly far.

In a preferred embodiment of the present invention, a bulky yarn is used as the continuous fiber yarn. Examples of the material include resins of various series such as polyester, polyamide, acrylic, polyvinyl alcohol (including acetalized product), polypropylene, polyethylene, polyvinyl chloride, polyvinylidene chloride, and acetate. It is also effective to use a conjugate yarn, particularly a bonded yarn. The use of this kind of bulky yarn increases the friction area with the compressed air at the time of press-feeding the fiber yarn or the bundle of fiber yarns, so that the transportability is further improved, the fiber yarns are easily separated after spraying, and the spray material is used. And the adhesion to the surface.
The number of crimps of the bulky processed yarn is preferably 50 to 9000, particularly preferably 100 to 3000 per 25 m of JIS L 1015.

When forming a greening base, a spun yarn consisting of a single fiber can be used.

As one component of the spun yarn, a super-absorbent fiber such as "Lanseal" (trademark) manufactured by Toyobo Co., Ltd. may be partially used. This combination can be achieved by preparing the wound cheese 6 for the required number of spun yarns and bundling them with other processed yarns. On the other hand, it is also possible to bundle the processed yarn with a continuous metal fiber. Further, a fiber in which a high-strength fiber material is provided inside and a low-strength fiber material is provided concentrically outside may be used.

As the bulky processed yarn or spun yarn, a single fiber having a total denier of 50 to 100 is used.
Bundling and blowing about 2 to 40 fibers of 0 d (denier) disperses more uniformly on the sprayed target surface,
It is preferable because the stability of the base is excellent. In the case of bundling, it can be converged by the ring guide 7 as in the above example.

On the other hand, it is conceivable to feed only one thin fiber yarn having a total denier, but it is easy to break when the yarn is conveyed in a hose. In comparison with the case where one thick fiber yarn is used, the fiber yarn bundle bundled when sprayed is dispersed and dispersed on each fiber yarn, and the dispersibility per unit area is increased, and other Good adhesion to the spray material.

On the other hand, when considering actual construction on a slope,
The maximum length is 100 m and the height is 30 m from the pumping plant. Therefore, it is important that the continuous fiber yarn bundle is transported in the hose without any resistance. Although a plastic hose can be used as the hose for this purpose, it has been found that this kind of plastic hose generates static electricity and the fiber yarn bundle is clogged in the hose. On the other hand, it has been found that a rubber hose, especially a hydraulic rubber hose having a smooth inner surface, can be smoothly transported without clogging due to static electricity. The inner diameter of the hose is preferably 15 to 30 mm.

The pressure of the compressed air is 2 to 15
kg / cm ² is preferred. The flow rate, preferably 0.3 ~5m ³ / min.

In the present invention, the spraying material mainly comprises:
It can be more suitably applied to the case of a slurry containing natural organic short fibers (such as peat moss or bark compost) or a mud-like greening base material containing black box or purified water cake than a mortar or concrete material. On the other hand, prior to spraying on the target surface, a mesh (such as lath)
By providing a protrusion or a stud, the adhesion to the spray material can be further improved.

[0034]

As described above, according to the present invention, particularly when a greening material is used, the mixing uniformity of the continuous fiber yarn with the material is improved.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of the method of the present invention.

FIG. 2 is a longitudinal sectional view of the pumping device.

FIG. 3 is a perspective view of an example of the ejection state adjusting device.

[Explanation of symbols]

1 ... spray nozzle, 2B ... pump, 3, 9 ... hose, 4
A, 4B: compressor, 5: continuous fiber yarn or continuous fiber yarn bundle, 7: ring guide, 10: pressure feeding nozzle,
20A, 21A: communication passage, 22: air supply hole, 23: header chamber, 24A, 24B: compressed air introduction port.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masao Kikuma 4-2-2-5 Kudankita, Chiyoda-ku, Tokyo Inside Light Industry Co., Ltd. (72) Yoshiji Sugiyama 4-2-2 Kudankita, Chiyoda-ku, Tokyo 35 Light Industry Co., Ltd. (72) Inventor Yuji Nakano 4-2-2 Kudankita, Chiyoda-ku, Tokyo Tokyo Light Industry Co., Ltd. (72) Einosuke Higashimura 1-5-1, Marunouchi, Chiyoda-ku, Tokyo Mitsubishi Rayon Engineering Co., Ltd. In-house (72) Inventor Yasuhisa Hirota 6-11 Izumihara-cho, Yamatokoriyama-shi, Nara (56) References JP-A-2-43414 (JP, A) (58) Fields investigated (Int.Cl) . ^6, DB name) E02D 17/20 102 E02D 17/20 104

Claims (2)

(57) [Claims] 1. A method for transporting a ground improvement material mainly through one of the hollow pressure-feeding conduits and ejecting the material from a tip thereof or a spray nozzle provided at the tip thereof, and blowing the other hollow pressure-feeding conduit into the interior. The continuous fiber yarn is put on the flow of air and discharged from the blowing nozzle provided at the leading end of the pressure feeding guide path or the tip thereof, and the discharge direction intersects with the flow mainly containing the improved material. A ground stabilization method, wherein a strip is put on the flow of the improving material and sprayed as an integral material on the surface to be improved. 2. The ground stabilization method according to claim 1, wherein the improved material is mainly pumped by a pump.