JPH08253933A - Reinforced-earth method by continuous fiber - Google Patents

Abstract

PURPOSE: To send sticky soils generated on a site, such as 'sirasu' (thickly deposited volcanic sand) or 'masu' (weathered decomposed granite) by air pressure without any troubles and hence reduce a construction cost greatly. CONSTITUTION: A continuous fiber-made thread is sent from a spool 1 housed in a thread feeding device 3 and the spun thread 4 is ejected from an ejection nozzle 5 of an ejector 6 by using high pressure water or a compressed air. On one hand, earth and sand are conveyed by air pressure in a material hose 11 up to a fiber ejection end and directly ejected to and mixed with the thread 4. In such a continuous fiber-based earth reinforcing work, 'sirasu' or 'masa' generated on a site is used as earth and sand wherein 'sirasu' is a highly deposited volcanic sand while 'masa' is weathered decomposed granite. An interface activator 16 is mixed with the soil generated on a site, thereby conveying the mixture by air pressure in the material hose 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforced earth construction method using continuous fibers.

[0002]

2. Description of the Related Art A reinforced earth construction method using continuous fibers will be described with reference to FIG. A yarn supplying device 3 that stores a yarn winding 1 of a continuous fiber yarn and has a guide stay 2 that sends out the yarn from the yarn winding 1, and a yarn 4 that is fed from the feeding device 3 from a water tank 7 via a high-pressure pump 8. And a sand supply device including a belt conveyor 10 and a spraying machine 12 having a material hose 11 and a fiber disposing device composed of an ejector 6 for spraying from a spray nozzle 5 using high-pressure water sent by a supply pipe 9. combine. In the figure, 13 is a compressor that supplies compressed air to the spraying machine 12, and 14 is a generator that serves as a power source for the high-pressure pump 8 and the like.

In the ejector 6, the yarn 4 is inserted into the jet nozzle 5, and when high-pressure water is discharged from the jet nozzle 5, the yarn 4 is also jetted from the jet nozzle 5 in association with it.

On the other hand, the sand is conveyed by the belt conveyor 10 and the material hose 11 to the spouting destination of the yarn 4, and the yarn 4
Directly inject and mix with.

The continuous fibers (multifilament untwisted yarn) of about 0.15 to 0.2% (dry weight ratio) of the sand thus used are jetted together with the jet water and three-dimensionally mixed with the sand to obtain shear strength. Therefore, it is possible to build a more stable and strong earth structure (The Offer bar).

In addition to retaining walls and embankments of roads, it can be widely applied to protection of slopes, embankment foundations on soft ground, earthquake- and earthquake-proof foundations, protection of structures against impacts, dam filter layers, and the like.

[0007]

In the reinforced earth construction method using continuous fibers shown in FIG. 2, sand that is not sticky is required to pneumatically feed the material hose 11, and most of the locally-generated soil (sand) is required. It is currently not used.

[0008] For example, if the sand such as Shirasu on the Shirasu plateau or Masa in the granite area is cut down and used as it is, the material hose 11 is too sticky and cannot be pneumatically fed.

If the sand used in this way is purposely procured, a large amount of material cost and transportation cost are required. In particular, the amount of sand used is enormous and the construction cost rises significantly.

In the case of pumping with a pump, it is possible to deal with the above problem by enlarging the pump. However, the reinforced earthwork method using continuous fibers is pneumatic pumping without a pump, and the spraying machine 12 Increasing the capacity of the compressor 13 that supplies compressed air to the can not handle it.

It is also considered to use a commonly used fluidizing agent. However, when the fluidizing agent is mixed, the whole becomes thick and muddy, and it can be conveyed by pneumatic feeding, but continuous fibers (three-dimensionally mixed with This will increase the shear strength and hinder the construction of a more stable and strong soil structure.

The object of the present invention is to eliminate the disadvantages of the above-mentioned conventional example, and even if locally generated soil with stickiness such as shirasu or masa can be pneumatically fed without any trouble, this locally generated soil can be utilized and the construction cost is greatly reduced. An object of the present invention is to provide a reinforced earth construction method using continuous fibers.

[0013]

In order to achieve the above-mentioned object, the present invention uses a high-pressure water or compressed air to take out a continuous fiber yarn from a bobbin stored in a yarn supplying device. In the reinforced soil construction method using continuous fibers, in which soil and sand are pneumatically conveyed in the material hose to the fiber injection destination and directly injected and mixed with the yarn, the locally generated soil is used as the earth and sand. However, the gist is that the surface-generated soil is mixed with a surfactant and pneumatically conveyed in the material hose, and that the locally-generated soil is Shirasu or Masa.

[0014]

According to the present invention as set forth in claims 1 and 2, even locally generated soil having stickiness such as shirasu or masa can be pneumatically conveyed without clogging the material hose.
Reinforced soil construction method using continuous fibers becomes possible.

[0015]

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 a reinforced earth construction method using continuous fibers of the present invention, in which the same constituent elements as those in FIG. 2 showing the conventional example are designated by the same reference numerals.

In FIG. 1, the outline of the reinforced earth construction method using continuous fibers is the same as that of the conventional example shown in FIG. 2, in which a spool 1 of continuous fiber threads is stored and the thread from this spool 1 is sent out. Yarn supply device 3 having guide stay 2
And the yarn 4 unwound from this supply device 3
From a fiber arranging device including an ejector 6 that ejects from a jet nozzle 5 by using high-pressure water sent from a high-pressure pump 8 through a supply pipe 9, and a spraying machine 12 having a belt conveyor 10 and a material hose 11. Combining with a sand feeder.

In the ejector 6, the injection nozzle 5
When the high-pressure water is ejected from the jet nozzle 5, the yarn 4 is also jetted from the jet nozzle 5, and the sand conveys the sand 4 to the belt conveyor 10 and the material hose 11.
Thus, the yarn 4 is conveyed to the jetting destination and directly jetted and mixed with the yarn 4.

In the present invention, as the earth and sand, Shirasu or Masa or other locally-generated soil is used, and the locally-generated soil 15 is mixed with the surfactant 16 to be pneumatically conveyed in the material hose 11. It is efficient to mix the surfactant 16 with the mixer 17 by stirring.

The surfactant 16 used in the present invention may be any one which is not trapped by ionicity or structure but improves surface fluidity by lowering surface tension, and examples thereof include alkyl fatty acid salts and abietic acid salts. Alkyl sulfate ester salt, alkylbenzene sulfonate salt, polyoxyethylene alkyl sulfate ester salt, polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether, alkyl trimethyl ammonium chloride, alkyl betaine, etc. are used in combination with one or more of them. .

The surfactant 16 is added to the locally generated soil 15 in an amount of 0.05 to 1% by volume and sufficiently stirred by a mixer 17 or the like.

<Example 1> Sodium dodecylbenzene sulfonate was added in an amount of 0.1% by volume (5%) to 1 m ³ of locally generated soil 15.
% Aqueous solution of 0.02 m ³ ) and sufficiently stirred and mixed with a mixer, and then sent to the spraying machine 12 and visually judged the state of pressure feed and conveyance by the material hose 11.

<Example 2> Polyoxyethylene nonylphenol ether (0.4% by volume (0.04 m ^{3 in} 10% aqueous solution)) was added to 1 m ³ of the locally generated soil 15 and the mixer 17 was used.
After sufficiently stirring and mixing with, the product was sent to the spraying machine 12 and the state of pressure-feeding and conveying with the material hose 11 was visually judged.

[0023] In <Example 3> local soil generated in 1 m ³ of 15 sodium laurate 0.6 volume% (10% aqueous solution 0.
06 m ³ ) and sufficiently stirred and mixed with a mixer, the mixture was sent to the spraying machine 12 and the feeding state of the material hose 11 under pressure was visually judged.

<Comparative Example 1> 1 m ³ of the locally generated soil 15 was sent to the spraying machine 12 without adding a surfactant, and the state of pressure feeding and conveying by the material hose 11 was visually judged.

<Test Results> The test results are shown in the following table.

[0026]

As described above, the reinforced soil construction method using continuous fibers of the present invention can be used to pneumatically feed even locally generated soil such as shirasu or masa, which has a stickiness, so that the locally generated soil can be used and the construction cost can be reduced. It can be greatly reduced.

[Brief description of drawings]

FIG. 1 is an explanatory view showing one example of a reinforced earthwork method using continuous fibers of the present invention.

FIG. 2 is an explanatory diagram showing a conventional example of a reinforced earth construction method using continuous fibers.

[Explanation of reference numerals] 1 ... spool 2 ... guide stay 3 ... yarn supply device 3a ... supply device 4 ... yarn 5 ... injection nozzle 6 ... ejector 7 ... water tank 8 ... high pressure pump 9 ... supply pipe 10 ... belt conveyor 11 ... Material hose 12… Spraying machine 13… Compressor 14… Generator 15… Local soil 16… Surfactant 17… Mixer

Claims (2)

[Claims] 1. A continuous fiber yarn is unwound from a bobbin stored in a yarn feeding device, and the unwound yarn is jetted from a jet nozzle of an ejector by using high-pressure water or compressed air, while soil and sand are In the reinforced soil construction method by continuous fiber that pneumatically conveys inside the material hose to the fiber injection destination and directly injects and mixes with the yarn, the locally-generated soil is used as the earth and sand, and the surface-generated soil is mixed with a surfactant. Reinforced earth construction method using continuous fibers, which is characterized by pneumatic transfer inside the material hose. 2. The method for reinforcing earth with continuous fibers according to claim 1, wherein the locally generated soil is Shirasu or Masa.