JP2775352B2 - Method and apparatus for pumping continuous fiber for ground stabilization - 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 and an apparatus for pressure-feeding continuous fibers for stabilizing the ground when spraying continuous fibers on a slope or the like to increase the resistance of a sprayed material to runoff.

[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 fibers. For example, Japanese Patent Publication No. 53-4 based on the applicant's proposal
No. 7602 discloses that continuous fibers are laid on a slope with a spray material. Also, Japanese Patent Laid-Open No. 55-16
No. 7170 also teaches mixing and blowing continuous fibers with mortars.

[0006]

The incorporation of continuous fibers 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 addition, in terms of required characteristics, there is an advantage that the amount of spray per target area is reduced.

However, according to the conventional continuous fiber pumping apparatus, even if the continuous fiber can be pneumatically pumped in principle, it is extremely difficult to pump the fiber 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 continuous fibers were passed through the nozzle and compressed air was supplied and conveyed between the nozzle and the tapered tube, the situation did not substantially change.

As described above, if continuous fibers cannot be transported over a long distance, they cannot be put to practical use, for example, when considering a slope that is far away from the ground and the spraying point. In addition, the present inventors have found that when the conveyance of the continuous fiber is not stable, when the continuous fiber is conveyed together with the sprayed material in the conveying pipe, the continuous fiber and the sprayed material slip and the fiber is cut. confirmed.

[0010] On the other hand, the worker loads the bobbin of the continuous fiber with the shoulder or installs the bobbin near the spraying point, guides the continuous fiber derived from the bobbin into the injection nozzle, and injects the continuous fiber into the injection nozzle. Many proposals have been made regarding spraying from a nozzle together with a spray material to a spraying target area near the nozzle and an apparatus suitable therefor. For example, Japanese Patent Publication No. 1-49661, Japanese Patent Application Laid-Open No. 1-310019, Japanese Patent Application Laid-Open No. -74732 and JP-A-2-49811. On the other hand, the present applicant has disclosed in
No. 177721 and JP-A-2-232421 have proposed a device suitable for carrying a continuous fiber on a long carrying pipeline and carrying it.

The continuous fiber conveying apparatus proposed by the applicant of the present invention significantly reduces the burden on the worker as compared with the case where the worker carries out the spraying operation while carrying the bobbin on the slope as the slope. In addition, the setup such as thread change upon completion of use of one bobbin can be performed on the ground, which is extremely advantageous in terms of workability and the like.

However, as described above, especially when the ground and the spraying point are far apart, the transportability in the pipeline may be reduced, or the transport itself may be difficult.

Therefore, a main object of the present invention is to make it possible to stably transport continuous fibers over a long distance.

[0014]

According to a first aspect of the method of the present invention for solving the above-mentioned problems, a first pressure-feeding nozzle is provided at a base end of one hollow pressure-feeding conduit, and a second pressure-feeding nozzle is provided in the middle. A nozzle is mounted, and an outside air introduction hole communicating between the outside and the inside is formed on the inlet side of the second pumping nozzle of the conduit, and pressurized air is blown into each of the pumping nozzles to form a base for the first pumping nozzle. The continuous fiber inserted from the end is fed under pressure through a conduit.

According to a second aspect, a first pumping nozzle is attached to a base end of a first hollow pumping guide, and continuous fibers inserted from the base end of the first pumping nozzle are inserted into the first pumping nozzle. The pressure is fed through the conduit by the blown pressure air, and another second conduit is provided in front of the first conduit in a separated state and in communication with the outside air. At the base end, another second pumping nozzle is attached, and continuous air derived from the distal end of the first conduit is guided into the second conduit by pressurized air blown into the second pumping nozzle. The pressure is fed through the second conduit.

In this case, it is desirable that the pressure or the flow rate of the compressed air blown into the second pumping nozzle is equal to or larger than the pressure or the flow rate of the compressed air blown into the first pumping nozzle.

On the other hand, the apparatus according to the present invention comprises a first hollow pressure-feeding conduit, and a continuous fiber inserted at the base end and blown into the interior through the first conduit. A first pressure-feeding nozzle for pressure-feeding, and another second pressure-feeding nozzle spaced apart in front of the first conduit and disposed in communication with the outside air.
And a second pumping nozzle attached to the base end and guiding the continuous fiber inserted therein by the air blown into the second guide while guiding the continuous fiber into the second guideway. It is characterized by the following.

In this case, a preferred mode of the pressure-feeding nozzle is that at least one of the first pressure-feeding nozzle and the second pressure-feeding nozzle has a substantially Venturi-shaped tubular communication passage, and a compressed air introduction port that communicates with the inside of the neck thereof. The compressed air introduction port is opened substantially in a ring shape so that the pressure fluid is ejected at right angles to the nozzle center or obliquely in the forward direction of conveyance.

Further, it is preferable that the first pressure feeding nozzle and the second pressure feeding nozzle are connected to different compressed air generating means. When the same compressed air generating means is used, a pressure reducing valve is provided in the first pumping system after the branch point, and the pressure of the compressed air blown into the second pumping nozzle is made higher than the first pressure. It may be.

When the transport distance is extremely long, or when the continuous fiber yarn has poor transportability, three or more pressure feeding nozzles can be provided in the transport direction.

[0021]

When a continuous fiber is transported over a long distance, it is conceivable that a pressure feeding nozzle is provided at the base end and midway of one continuous pressure feeding guide path, and air is blown into each pressure feeding nozzle. However, it has been found that it is actually difficult to increase the transport energy of the fiber transported from the base end even if air is blown into the pressure feeding nozzle provided on the way. On the other hand, the pressure feeding guideway is divided, and a portion communicating with the outside air is formed in the divided portion,
If another pumping nozzle is provided at the base end of the leading-side pumping conduit,
When compressed air is blown from another pumping nozzle, outside air is introduced from a portion communicating with the outside air, and energy by blowing the compressed air from another pumping nozzle is given to the continuous fiber, so that the fiber is transferred over a long distance. Can be transported.

In this case, it is also possible to use a single pressure feeding guide path. In this case, by forming an outside air introduction hole on the inlet side of another pressure feeding nozzle, it is possible to carry a long distance similarly.

Further, as a pressure-feeding nozzle according to the present invention,
It has a substantially Venturi-shaped communication passage, and a compressed air introduction port is formed at the neck thereof, which communicates with the inside. This compressed air introduction port is substantially formed so that the pressurized fluid jets at right angles to the nozzle center or obliquely in the forward direction of conveyance. It is preferable that the opening is formed in a ring shape. Although the use of this pressure-feeding nozzle has not been proved to be effective for stable conveyance, the compressed air discharged from the compressed-air introduction port jets orthogonally toward the center of the nozzle or obliquely forward in the conveyance direction. As a result, the fiber passing through the center of the nozzle is constrained from its periphery, and is conveyed while always maintaining the center in position. Therefore, it is considered that the fiber can be stably conveyed over a long distance.

[0024]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

FIG. 1 shows an example of a spraying state suitably applied to a greening base material. Reference numeral 1 denotes a spraying nozzle, and a spraying raw material M is fed through a hose 3 from a stirrer 2A by a pump 2B. Is sprayed from the spray nozzle 1 at the tip onto a target surface, for example, a slope G.

On the other hand, continuous fibers 5 such as polypropylene are fed out of the wound cheese 6 wound in, for example, a cone shape, passed through a ring guide 7 and a reel 8, and introduced into a pressure feeding nozzle 10A according to the present invention. The compressed air generated by the compressor 4A and the other compressor 4B is ejected from the distal end thereof through the fiber pressure feeding hose 9A as the hollow pressure feeding conduit of the present invention and the pressure feeding hose 9B connected to the fiber pressure feeding hose 9B. The tip of the hose 9B is integrated with the spray nozzle 1 by a stopper 11, and the direction of ejection of the hose 9B intersects with the direction of ejection of the spray material M from the spray nozzle 1. . In addition, in FIG. 1, although the pressure feeding hose 9B is shown below the spray nozzle 1, it is preferable that it is located above.

In a preferred embodiment, a plurality of cheeses 6 are prepared, and continuous fibers 5 from each of the cheeses 6, 6,... Are bundled, for example, at a ring guide 7 and supplied to the pressure feeding nozzle 10A as one continuous fiber. The rotation axis of the reel 8 is connected to a pulse generator 12 or the like, and by counting the number of pulses, the running speed of the continuous fiber 5 and therefore the ejection amount of the continuous fiber 5 can be determined based on the known reel diameter. It detects and controls the amount of spout. In order to control the ejection amount, for example, the air flow rate 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, from the continuous fiber 5 to the pressure feeding nozzle 10A. The fiber supply speed can be adjusted by a brake (not shown) provided at an appropriate position. The detected traveling speed of the fiber 5 is also effectively used for adjusting the amount of fiber mixed in the spray material M actually blown on the slope G by adjusting the spray amount of the spray material M based on the detected travel speed. be able to.

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 part, 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.

In such a pressure feeding nozzle, before the fiber 5 is conveyed, the tip of the fiber 5 is threaded inside the nozzle. Next, when the compressed air is supplied from the air supply hole 22, the air once goes around the entire circumference in the header chamber 23, and is jetted out through the ring-shaped compressed air introduction ports 24A and 24B at a uniform flow rate. At this time, the compressed air introduction ports 24A and 24A
Since the width of 4B is narrow, the air is jetted obliquely and forward of the axis of the communication path 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 part is low, and as a result, a large amount of surrounding air is entrained from the inlet of the communication passage 20A, and the compressor 4
With a flow rate many times the amount of air supplied from B and at an increased flow velocity, the air flows toward the tip. The fibers 5 are entrained and conveyed by the compressed air.

In this case, the minimum diameter d shown in FIG. 2 is 3 mm.
Above, 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 fibers 5 thus fed are ejected from the end of the hose 9. The ejected fibers 5 are drawn into the flow of the spray material M ejected from the spray nozzle 1 and are accompanied by the fibers 5 and are sprayed on the target slope G. As a result, a slope stabilizing layer in which the continuous fibers 5 are mixed in a random state is formed on the slope G.

Fine adjustment of the ejection state of the spray material M can be performed by an adjusting device 30 attached to the tip of the spray nozzle 1 as shown in FIG. 3, for example. The spray nozzle 1 has a rubber nozzle 1A only at its tip, and a mounting ring 31 is fixed around the rubber nozzle 1A.
33, a main body handle 34 is fixed to a lower pivot plate 33, and a rotating plate 35 is
6, the other end of the rotating plate 35, the upper holding plate 33 and the connecting rod 37 are connected. Reference numeral 38 denotes an operation handle integrated with the rotating 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 the present invention, as the slope becomes higher or wider, the conveying distance of the spray material M and the fiber 5 becomes longer. In this case, there is a case where there is a limit in transporting the fiber 5 over a long distance with only one compressor 4A and the pressure feeding nozzle 10A, or there is a case where it is desired to further stabilize the transport.

For this purpose, as shown in detail in FIG. 5, another pumping hose 9B is connected to the front of the pumping hose 9A at a distance, and is connected to the base end of the pumping hose 9B.
Attach the pressure feeding nozzle 10B. Also, the pressure feeding hose 9
To make it convenient to bring between A and 9B to the target spray location,
The pressure-feeding nozzle 10B and the pressure-feeding hose 9A are connected to each other directly or via a connection fitting 13 fixed to the tip of the pressure-feeding hose 9A. An outside air introduction hole 13 a is formed in the connection fitting 13.

According to this embodiment, the fibers 5 are compressed by the compressed air blown by the compressor 4A so that the fibers 5 are compressed.
Is pumped inside and discharged from the tip. In addition, the compressed air blown from the compressor 4B generates a flow of air flowing forward in the pressure-feeding hose 9B. At this time, a large amount and high-speed outside air is introduced from the outside-air introduction hole 13a. While pulling the fiber 5 discharged from the tip into the pressure feeding nozzle 10B, the fiber 5
Strong transfer force is applied to the
B is stably transported to the target spraying location.

FIG. 6 shows another embodiment in which a pressure feeding nozzle 10B is mounted in the middle of a single continuous or substantially continuous pressure feeding hose 9, and a large number of outside air introduction holes are provided at the base end thereof. 9a. Also in this mode, the inside of the pressure feeding hose 9 can be stably transported over a long distance.

In a preferred embodiment of the present invention, a bulky yarn is used as the continuous fiber. 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. Of these, polypropylene is particularly suitable in terms of plant growth, although the reason is not clear. Conversely, polyesters can inhibit plant growth by adsorbing iron in the soil. It is also effective to use a conjugate yarn, particularly a bonded yarn. The use of this kind of bulky yarn increases the frictional area with the compressed air at the time of feeding the fiber, thereby improving the transportability, and furthermore, it is easy to disperse the fibers after spraying, and the adhesion to the spraying material also increases. 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 a greening base is formed, a spun yarn composed of a single fiber can be used. As one component of the spun yarn, a super-water-absorbing fiber such as "Lanseal" (trademark) manufactured by Toyobo Co., Ltd. may be partially used. For this combination, the above-mentioned wound cheese 6 for the required number of such spun yarns is used.
Can be prepared and bundled 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 internally and a low-strength fiber material is provided concentrically 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 that only one fiber of total denier thin fiber is pressure-fed. However, while the fiber is easily broken when it is transported in a hose, the overall strength is increased by bundling, and the total denier is reduced. In comparison with the case of using a single thick fiber, each fiber bundled when sprayed is dispersed and dispersed, the dispersibility per unit area is increased, and the adhesion with other sprayed materials is good. Become. In particular, when mortars described below are used as the spraying material, friction between the mortar and the fiber is generated, and the mortar is easily broken.
By bundling the fibers, even if the surrounding fibers break or are weakened in strength, the fibers in the center remain, so that no cutting occurs during the transportation process in the pressure feeding hose.

On the other hand, when considering the actual construction on the 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 is conveyed in the hose 9 without resistance. Hose 9 for this
Although it is possible to use a plastic hose, it has been found that this type of plastic hose generates static electricity and the fibers are 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. Although the inner diameter of the hose is preferably 30 mm or more from the viewpoint of the transportability of the fiber yarn, if it is too thick, the workability when moving on a slope is poor, which is not preferable. Incidentally, the pressure of the compressed air is preferably ² to 15 kg / cm ² . The flow rate is 200
~ 2000 l / min is preferred. In this case, the flow rate and / or pressure to the pressure feeding nozzle 10B is
Making it the same or larger than that of the above provides excellent long-distance transportability. In addition, when the pressure-feeding nozzle having the above-described structure is used, in the case of the pressure-feeding nozzle disclosed in JP-A-2-147721, the flow rate
1.8 to 3.34 m ³ / min, pressure 2.0 to 6.1 kg / cm ² were required, whereas flow rate 800 liter / min and pressure 6.5 kg
/ Cm ² was sufficient for conveyance. In the above example, the spraying material and the continuous fiber are separately transported because the spraying of the greening base material is mainly intended for spraying, but in the case of a mortar-based material,
As shown in FIG. 4, a Y-tube 14 is provided in the middle of the transport path or at the tip side, for example, at the base of the spray nozzle 1.
Here, they can be conveyed together and sprayed. In FIG. 4, reference numeral 2 denotes a spray machine using a known mortar spray machine, and 4C denotes a compressor for pressure feeding.

In the present invention, the spraying material includes a mortar or concrete material, 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. It is. Other natural or synthetic short fibers such as acryl can be mixed into the spray material. In any case, due to the mixing of short fibers, for the prevention of collapse of the entire target surface or the improvement of strength, continuous fibers work effectively, and for partial erosion, prevention of collapse,
The short fibers have a function to work effectively. Furthermore, dispersing the continuous fibers uniformly on the target slope
High skill is required at the time of spraying. On the other hand, as long as the short fibers are uniformly dispersed in the material in advance, the short fibers can be uniformly dispersed on the target slope, and thus are also preferable.
On the other hand, a net-like body (such as a lath) or a projection (a stud) is provided on the target surface prior to spraying, so that the adhesion to the spray material can be further improved.

On the other hand, as shown in FIG. 4, in order to surely put the fiber on the flow of the spray material outside the spray nozzle 1, as shown in FIG. Water can be attached to the fibers 5 by the addition device 16. This prevents the fibers 5 from scattering outside the target direction. Further, as shown in FIG. 1, the polymer-absorbent resin powder 15 can be added to the fiber 5 while being placed on the conveying path of the fiber 5. Seeds and agglomerating agents in the spray material can also be added through the transport path of the fiber 5.

Example An example will be described below. (Example 1) The number of clogging in the hose was checked according to the material of the hose.

The conditions are as follows: Fiber used: polypropylene
One 700d, processing thread, hose length 50m, air pressure 5.6-4.1
kg / cm ² , and the amount of air was 3.34 m ³ / min. The number of clogging is the number of times when 10 times of 5 minute pumping was performed, and the results are shown in Table 1. As a result, it was found that there was less trouble with the rubber hose than with the vinyl chloride hose, and the trouble was less with the hydraulic hose having a smooth inner surface. In addition, the larger the inner diameter, the fewer the troubles, and the larger the amount of discharged fibers.

(Example 2) The difference in the fiber discharge amount with respect to the pumping length was examined. Conditions are as follows: fiber used: one polypropylene 700d, processed yarn, hose: hydraulic hose 1 inch, air pressure 5.6 to 4.1 kg / cm ² , air volume 3.34 m ³ / min. The reduction rate is based on the case of a hose length of 50 m. The results were as shown in Table 2.
As a result, it was found that the longer the hose length, the smaller the discharge amount, but the difference of 30 m hardly affected the discharge amount of the fiber. However, it was also found that the discharge amount was considerably reduced at 50 m.

(Embodiment 3) On the other hand, when carrying 100 m, two 50 m pumping hoses were used, and a pumping nozzle was attached to the front pumping hose. , Air pressure
6.6kg / cm ² , pressurized air blow at 4.0m ³ / min,
As a result of the transportation, the rate of decrease in the discharge amount was 98%, and there was substantially no decrease in the pressure-feed amount.

(Example 4) The difference in the discharge amount depending on the type of fiber was examined. Conditions are: hydraulic hose: 1 inch, 30m, fiber: 340d polyester,
The air pressure was 6.6 kg / cm ² and the air amount was 0.65 m ³ / min.
As a result, as shown in Table 3, it was found that the discharge amount increased by 60 to 80%, not by the number of tubes. In addition, it was found that the processed yarn had a higher discharge rate by 10 to 13% than the unprocessed yarn, and was superior in transportability.

(Example 5) The difference in the discharge amount depending on the fiber thickness was examined. Conditions are as follows: hydraulic hose: 1 inch, 42 m, fiber: wooly thread, polyester, air pressure 6.6 kg / cm ² , air volume 0.65 m ³ / min
And As a result, as shown in Table 4, it was found that the ejection amount increased when the fiber became thick.

[0052]

[Table 1]

[0053]

[Table 2]

[0054]

[Table 3]

[0055]

[Table 4]

[0056]

As described above, according to the present invention, there is an advantage that the continuous fiber can be stably transported over a long distance.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a first example 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.

FIG. 4 is a schematic diagram of a second example of the method of the present invention.

FIG. 5 is an enlarged longitudinal sectional view of a main part of a continuous portion.

FIG. 6 is an enlarged longitudinal sectional view of a main part of another example of a continuous portion.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Spray nozzle, 3, 9 ... Hose, 4A, 4B ... Compressor, 5 ... Continuous fiber, 10 ... Pumping nozzle, 20A,
21A: communication passage, 22: air supply hole, 23: header chamber,
24A, 24B ... Compressed air inlets.

──────────────────────────────────────────────────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 Prefecture (56) References JP-A-2-232421 (JP, A) (58) Fields investigated (Int.Cl) . ^6, DB name) E02D 17/20 102 E02D 17/20 104

Claims (6)

(57) [Claims] 1. A first pressure-feeding nozzle is mounted at the base end of one hollow pressure-feeding conduit, and a second pressure-feeding nozzle is mounted in the middle thereof. Forming an outside air introduction hole that communicates with the air, blowing compressed air into each of the pumping nozzles, and pumping continuous fibers inserted from the base end of the first pumping nozzle through a conduit. Method for feeding continuous fibers. 2. A pressure air for blowing a continuous fiber inserted from a base end of the first pumping nozzle into a first pumping nozzle, the first pumping nozzle being attached to a base end of the first hollow pumping guide path. And the other second conduit is disposed in front of the first conduit in a separated state and in communication with the outside air, and is provided at the base end of the second conduit. Another second pumping nozzle is attached, and the continuous fiber derived from the tip of the first conduit is guided into the second conduit by pressurized air blown into the second pumping nozzle. 2. A method for pumping continuous fibers for ground stabilization, comprising pumping via a conduit. 3. The ground according to claim 1, wherein the pressure or flow rate of the compressed air blown into the second pumping nozzle is equal to or greater than the pressure or flow rate of the compressed air blown into the first pumping nozzle. A method for feeding continuous fibers for stabilization. 4. A first hollow pressure feeding conduit and a first hollow fiber attached to the proximal end thereof for feeding continuous fiber inserted therein through the first conduit by air blown into the inside. A pressure-feeding nozzle, another second hollow pressure-feeding conduit spaced apart in front of the first conduit and in communication with the outside air, and a continuous fiber attached to the base end and inserted therein. And a second pressure feeding nozzle for pressure feeding while guiding the air into the second conduit by air blown into the inside. 5. At least one of the first pumping nozzle and the second pumping nozzle has a substantially Venturi-shaped communication passage, and has a neck formed with a compressed air inlet communicating with the inside thereof, and the compressed air inlet is The apparatus for feeding continuous ground stabilizing fibers according to claim 4, wherein the pressure fluid has a substantially ring-shaped opening so as to jet the pressure fluid at right angles to the nozzle center or obliquely in the forward direction of conveyance. 6. The apparatus for feeding continuous ground stabilizing fibers according to claim 4, wherein the first and second pumping nozzles are connected to different compressed air generating means.