JPH0971968A - Sediment transportation method - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To provide a technique for transporting earth and sand capable of economically transporting while preventing a blockage accident in a hose. SOLUTION: The water content of the earth and sand 20 is reduced by stirring and mixing the earth and sand 20 and the water absorbing material 21 prior to the transportation of the earth and sand 20.
After that, the earth and sand 20 is conveyed by air through the conveying hose 30 together with the water absorbing material 21 that has absorbed water.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for transporting earth and sand,
More specifically, silt-based sediments and clay-based sediments that have a relatively high water content (hereinafter collectively referred to as "sand")
The present invention relates to a method of transporting earth and sand by air.

[0002]

2. Description of the Related Art For example, there is a case where a green belt is formed on an upper step of a road in parallel with a work for cutting a road in a mountainous area to construct a road. When the ground in the vegetation zone is hard and unsuitable as a vegetation base, it is necessary to bring in hydrated soil suitable for revegetation, such as silt-based earth and clay-based earth and sand, to form a customer soil layer. BACKGROUND ART Generally, a hose transportation method is known as a method for carrying earth and sand to a slope step where it is difficult to introduce heavy equipment such as a backhoe or a transportation vehicle such as a dump truck. Further, as a hose transportation method, there are a method of adding water to earth and sand to form a slurry and pumping it, and a method of directly air-pressing the earth and sand without touching it.

[0003]

The above-mentioned soil hose transportation technique has the following problems. <a> The method of transporting sediment in a slurry state not only requires a large amount of water, but also requires treatment of excess water after the sediment is transported. Not suitable for transportation. There is also a problem that an auxiliary facility is required to block the slurry-like mud after transportation. <B> In the method of directly transporting sediment by air, if the transported sediment is water-containing sediment, it is likely to adhere to the hose and be clogged, which is not suitable for transporting water-containing sediment containing a lot of silt and clay. . Therefore, the earth and sand that can be transported by air are limited to expensive sand, and the material cost is high.

The present invention has been made in view of the above points, and it is an object of the present invention to provide a technique for transporting earth and sand which can be economically transported by preventing blockage in a hose when air is transported. . Another object of the present invention is to provide a technique for transporting earth and sand, which is capable of transporting earth and sand (sandy soil) containing a large amount of silt or clay, which is difficult to convey by air.

[0005]

SUMMARY OF THE INVENTION The present invention is a method of transporting earth and sand in which air is fed from one direction into a transport hose, and in the method of transporting earth and sand, the earth and sand are conveyed and the water-absorbing material is conveyed in advance. It is a method of transporting earth and sand, which comprises stirring and mixing, and then air-pressurizing a water-absorbing material that has absorbed the water content of the earth and sand and earth and sand with an apparently reduced water content through a conveying hose. Furthermore, the present invention is a method of transporting earth and sand by feeding air from an air pump into a transfer hose,
Prior to the transportation of the sediment, the transported soil, the water absorbing material and the fiber group are agitated and mixed, and then the water absorbing material that has absorbed the water content of the earth and sand, and the sand and sand with a reduced apparent moisture content and the dispersed fiber are pneumatically fed through the transportation hose. The method of transporting earth and sand is characterized by: Furthermore, the present invention is a method of transporting earth and sand by sending air from an air pump into a transport hose, and stirring and mixing the transported earth and sand, a water absorbing material, a fiber group and a solidifying agent prior to the transportation of the earth and sand. , Thereafter characterized by air-pushing a water-absorbing material that has absorbed the water content of the earth and sand and the sand and sand with a reduced apparent water content and the dispersed fibers through a transfer hose,
It is a method of transporting earth and sand. Furthermore, the present invention is the method for transporting earth and sand, characterized in that the water-absorbing material described above is a highly water-absorbent resin. Further in the present invention, the above-mentioned fibers are processed fibers,
Alternatively, it is a method of transporting earth and sand characterized by being a mixture of processed fiber and vegetable fiber.

[0006]

Embodiment 1 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

<B> Transport Facility FIG. 1 shows a conceptual diagram of the transport facility. Reference numeral 10 is a stirring tank,
It is equipped with a stirring blade 12 that is rotated by driving a motor 11. The stirring tank 10 can forcibly knead the earth and sand 20 charged by a belt conveyor, a shovel car, etc. and the water absorbing material 21. In addition, the mixing amount of the water absorbing material 21 is 2
By adjusting the opening / closing operation of the adjusting valve 22 according to the property of 0 and the water content, it is possible to appropriately adjust. Stirring tank 1
In the middle of the transfer hose 30 connected to the bottom of the compressor 0, a compressor 33 composed of an air pump 31 and a motor 32 is provided.
By inserting air into the transfer hose 30 through the compressor 33, the earth and sand 20 including the water absorbing material 21 drawn from the stirring tank 10 can be discharged from the spray nozzle 34 at the tip through the transfer hose 30. It is like this. The air pump 31 is a known pump, and the transfer hose 30 is a known flexible hose or PVC pipe.
It includes steel pipes and the like.

<B> Water Absorbing Material The water absorbing material 21 is an additive added for the purpose of absorbing water to reduce the water content of the earth and sand 20 to improve the apparent viscosity and enable the hose to be transported, for example, in a known dry state. It is possible to use an inorganic water absorbing material such as clay powder, or a highly water absorbing resin having high water absorbing performance. As the water absorbing material 21, for example, inorganic materials such as verculite, zeolite, silica, perlite, various burnt ash, stone powder, etc. can be used. As the super absorbent polymer, for example, polyacrylate cross-linked product, hydrolyzate of starch / acrylonitrile graft copolymer, (meth)
Examples include acryloyloxyethyl trialkylammonium salt crosslinked products, (meth) acrylamidopropyltrialkylammonium salt crosslinked products, polyacrylamide-2-methylpyropansulfonate crosslinked products, and the like. As the water-absorbing material 21, other inorganic materials such as zeolite,
Silica, perlite, various roasted ash, etc. can be used.

[0009]

[Operation] Next, a method of transporting earth and sand will be described. <A> Addition of earth and sand and water absorbent material The earth and sand 20 and the water absorbent material 21 in proportion to the amount of earth and sand 20 introduced are respectively charged into the stirring tank 10 in which the stirring blades 12 rotate.

<B> Primary agitation of earth and sand The water-absorbing material 21 that is agitated and mixed with the earth and sand 20 in the agitation tank 10 is the pore water existing between the earth particles constituting the earth and sand 20 and the water adhering to the surface of the earth particles. It absorbs water and stores it inside without releasing the absorbed water. As a result, the apparent water content of the soil 20 decreases. Since the water absorbent material 21 does not exhibit adhesiveness even when it absorbs water, there is no concern that the viscosity of the earth and sand is increased.

<C> Sediment Transport and Secondary Agitation When most of the water content of the soil 20 is absorbed by the water absorbing material 21 in the stirring tank 10, the compressor 32 is driven by the motor 32 and the transport hose is directed toward the spray nozzle 34. At the same time as supplying air to the inside of 30, the hopper at the bottom of the stirring tank 10 is opened.
Then, the earth and sand 20 containing the water absorbing material 21 that has been agitated and mixed in the agitation tank 10 is pulled out by the negative pressure generated in the transfer hose 30, and is further conveyed in the transfer hose 30 by the air supply force of the compressor 33. It During transportation, the earth and sand 20 are mixed again with the water absorbing material 21 in the conveyance hose 30 by stirring and mixing.
The apparent water content of is further reduced. Since the earth and sand 20 changes into a substantially dry state as the water content decreases, the air is conveyed without closing the conveyance hose 30.

<D> Discharge The earth and sand 20 transported by air in the transport hose 30 is discharged from the spray nozzle 34 together with the water absorbing material 21. Since the discharged water absorbing material 21 contains water, it finally functions as a water retaining agent for the earth and sand 20. When the soil 20 transported by air is heavily scattered due to drying, it may be discharged while adding water at the tip of the spray nozzle 34.

[0013]

[Embodiment 2] In the above, the embodiment in which only the earth and sand 20 is conveyed is described, but the earth and sand 20 may be mixed with a vegetable fiber which is a soil improving material. It is desirable to use bark compost or peat moss as the vegetable fiber. Further, the soil 20 may be a processed fiber or a mixture of a processed fiber and a plant fiber.
As the processed fiber, an acrylic fiber having a length of about 5 to 50 mm and a fineness of 30 to 50 d can be used, and it is preferable to use bark compost or peat moss as the vegetable fiber. The processed fibers and plant fibers that can be mixed in the soil 20 are described in, for example, JP-A-58-11072.
It is disclosed in Japanese Patent Laid-Open No. 2 publication, and detailed description thereof will be omitted.

[0014]

[Embodiment 3] In addition to mixing the soil 20 with plant fibers as a soil improving material, an appropriate solidifying agent may be mixed. The solidifying agent is mixed with the soil improving agent such as vegetable fiber in advance by air pressure feeding, or is mixed immediately before spraying the nozzle.

[0015]

Fourth Embodiment The earth and sand 20 is not limited to silt-type or clay-type earth and sand, but includes all kinds of earth and sand.

[0016]

Since the present invention is as described above, the following effects can be obtained. <A> The water content of the earth and sand can be conveyed by air after stirring and mixing with the water absorbing material to reduce the water content of the earth and sand, and the water content of the earth and sand can be further reduced by agitating and mixing the water absorbing material and the earth and sand in the transfer hose. Therefore, it is possible to transport the earth and sand at low cost by avoiding blockage in the transport hose. <B> Up until now, it has been impossible to carry out air transfer of earth and sand containing a large amount of silt and clay, but in the present invention, this kind of earth and sand can be transferred by air. Therefore, unused construction materials such as sand and construction soil can be effectively used.

[Brief description of drawings]

FIG. 1 is a conceptual diagram of a method of transporting earth and sand according to the present invention.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuji Nakano 4-2-35 Kudankita 4-chome, Chiyoda-ku, Tokyo Light Industry Co., Ltd.

Claims (5)

[Claims] 1. A method of transporting earth and sand by feeding air from one direction into a transport hose, wherein the transported earth and sand and the water absorbing material are agitated and mixed prior to the transportation of the earth and sand, and then the water content of the earth and sand is changed. A method of transporting earth and sand, characterized in that the water-absorbing material that has absorbed water and the earth and sand with a lower apparent water content are pneumatically fed through a transport hose. 2. A method of transporting earth and sand by sending air from an air pump into a transport hose, wherein the transported earth and sand, the water absorbing material, and the fiber group are stirred and mixed prior to the transportation of the earth and sand, and then the earth and sand. A method for transporting earth and sand, characterized in that the water-absorbing material that has absorbed the water, the earth and sand with an apparently reduced water content, and the dispersed fibers are air-fed through a conveying hose. 3. A method of transporting earth and sand by sending air from an air pump into a transport hose, wherein the transported earth and sand, a water absorbing material, a fiber group and a solidifying agent are stirred and mixed prior to the transportation of the earth and sand. After that, a water-absorbing material that absorbs the water content of the earth and sand, earth and sand with an apparently reduced water content, and dispersed fibers are pneumatically fed through a conveying hose, and the earth-and-sand conveying method. 4. The method of transporting earth and sand according to claim 1, wherein the water absorbing material is a highly water absorbent resin. 5. The method for transporting earth and sand according to claim 1, wherein the fiber is a processed fiber or a mixture of a processed fiber and a vegetable fiber.