JPH0439388A - Method for mixing earth and sand with fibrous material - Google Patents

Abstract

PURPOSE:To economically and efficiently improve soil properties and soil itself by laminating earth and sand and a fibrous material in the form of thin layers, then dropping and mixing the resultant laminate by own weight thereof. CONSTITUTION:(A) Optional earth and sand containing sandy soil or viscous soil at a high moisture content, etc., and (B) a fibrous material such as natural fiber, regenerated fiber, synthetic fiber, inorganic fiber or metallic fiber in the form of monofilament, multifilament, twisted yarn, tape yarn, spun yarn, split yarn, burst fiber, etc., having about 0.5-10,000 denier (optimally 5-50 denier) thickness and about 2-800mm (optimally 40-90mm) length are laminated to about 1-100mm (optimally about 5-20mm) thickness and the resultant laminate is then dropped from a place at 1-10m (preferably about 2-5m) height by own weight thereof and mixed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method of mixing fibrous materials with impurities and soil in a method of reinforcing soil with fibrous materials.

Earth and sand reinforced with III materials can be used for embankment structures such as residential land development, and for ground reinforcement.

[Prior Art] Various methods are known for mixing fibrous materials with earth and sand (particularly clayey soil) for the purpose of reinforcing and improving the quality of the earth and sand.

A typical method is to mix fibrous materials with soil and sand using a mixer such as a concrete mixer, shape, or screw type, but in these methods, the viscosity of the soil increases due to the so-called kneading effect, causing it to form into lumps. becomes. -511M-like material is HH
Difference in specific gravity of objects, frictional force.

It is extremely difficult to uniformly disperse and mix the fibrous materials into the earth and sand because the fibrous material becomes a lump of m miscellaneous materials due to the action of focusing force and the like. Several proposals have been made to solve this problem, but it is still not considered that the problem has been solved satisfactorily (for example, Japanese Patent Laid-Open No. 55-167170, Japanese Patent Laid-Open No. 57-100212, etc.) ).

Therefore, in practice, earth and sand are sufficiently dried or, conversely, their water content is increased to 100% or more to increase their fluidity before use.

In addition, in order to reduce the frictional force and focusing force of the l1illt material, efforts have been made to make it into a special shape.
-55786).

By the way, Japanese Patent Application Laid-Open No. 2-55786 has a special shape of I.
This method attempts to uniformly mix earth and sand and fibrous materials by using a special mixing device with a specific function, and lacks versatility.

[Object of the Invention] In contrast, an object of the present invention is to provide a method of mixing earth and sand and miscellaneous materials using a more versatile means.

[Structure of the Invention] That is, the present invention provides a method for mixing earth and sand and fibers, characterized in that the earth and sand and fibers are mixed by laminating them in a thin layer and then allowing them to fall under their own weight. ``Method of mixing with similar substances.''

The soil used here includes not only sandy soil but also viscous soil with a high moisture content, and is not particularly limited.

As the fibrous material, any of natural fibers, regenerated fibers, synthetic fibers, inorganic fibers, metal fibers, etc. can be used. The forms of fibrous materials are monofilament, multifilament, twisted yarn, and tape yarn.

Any of spun yarn, split yarn, burst fiber, etc. may be used.

The thickness of the fibrous material is about 0.5 to 10,000 denier.
Preferably 1 to 1000 denier, more preferably 5 to 5
It is 0 denier. If it is less than 0.5 denier, it is not preferable because mill-like objects tend to aggregate when falling under its own weight. 1
If it exceeds 0,000 denier, the rigidity of the IN-like material causes poor intertwining between the I [miscellaneous material and earth and sand, resulting in a reduction in the reinforcing effect.

The length of the 171M-shaped object is about 2 to 800M, preferably 2
0 to 4ooagt, more preferably 40 to 901m.

If the length of the filament is less than 2 m, the reinforcing effect is insufficient. When it exceeds 800 am, when it is stacked in 8 layers on the earth and sand,
It becomes difficult to laminate to a uniform thickness. Furthermore, when falling under its own weight, the IIH-like objects tend to become entangled with each other and form a lump.

The earth and sand and the fibrous material are stacked in a 1 liter layer. The thinner the layer, the more preferable it is, but in reality it is about 1 to 100 sews, more preferably about 5 to 20 sews. Earth and sand and 1! It is preferable that each of the fibrous materials is in the form of a single layer, and a plurality of layers are alternately laminated. Sediment layer - layer! It is also possible to simply form a gold layer on the IN-like material.

The distance when falling under its own weight is 1lii-shaped earth and sand and t.
The distance is sufficient for the 1AN-like material to be uniformly mixed with each other by falling. It is preferable to provide a distance (height) of about 1 to 10 m, preferably about 2 to 5 m, depending on the properties of the earth and sand and the form of the tan shape.

A wide conveyor belt is usually used to continuously mix the soil and fibrous material. That is, a thin layer of earth and sand or fibrous material is placed on a conveyor belt, and a thin layer of fibrous material or earth and sand is placed on top of the conveyor belt, and the earth and sand are placed from the edge of the conveyor belt at a fall distance of 1 to 10 m.
#4 Let fall items fall under their own weight and store them in, for example, a dump truck case.

To make the soil into a III-like shape, it may be leveled with a shovel to form a thin layer, but usually the soil is spread mechanically. To form a thin layer of fibrous material, the fibrous material is usually sprayed while being blown away with an air nozzle.

[Effect of the invention] The present invention has the following effects.

(1) Geo-textiles have been widely used in reinforced earth construction methods, but the present invention can improve the soil quality and soil itself in place of these geo-textile skeletal reinforced soils. .

(a) In the present invention, restrictions on IIN-like materials as reinforcing materials are greatly relaxed, and it is possible to mix them up to a particularly high mixing ratio.

(3) In the present invention, the decrease in tensile strength of the fibrous material due to the mixing operation is so small as to be almost negligible.

(4) The present invention enables economical and efficient treatment of large amounts of earth and sand, especially for civil engineering works, with a small space and small-scale equipment.

(5) The mixed soil according to the present invention can be treated in almost the same way as ordinary earth and sand, and the transportation, backfilling, compaction methods, etc. are no different from ordinary civil engineering work.

[Example] The present invention will be specifically explained below using Examples.

In the Examples, the uniaxial compressive strength was measured as follows.

Diameter 35mm by compaction method with constant uniaxial compressive strength. Height 70. A cylindrical sample was prepared and subjected to a uniaxial compression test. Compressive strength is axial strain 15%
He became angry.

Example 1 FIG. 1 shows an outline of Example 1.

Kanto loam soil 4 shown in Table 1 was placed on a belt feeder 3 with a width of 501 and a length of 5 TrL that operated at a speed of 30 m/min.
The soil was supplied with a shovel at a supply rate of 0.6 m3 (50 shoes thick) per minute, and at the same time, the soil was crushed into pieces with an equivalent diameter of 20 mm or less using a clay blade, etc., and then distributed.

On the other hand, the polyester long fiber @ 1000 denier 250 filament and 20 roving yarns 7 which were combined from the yarn feeder 1 were guided to the roving cutter 2 and cut, and sprayed onto the Kanto loam soil thin layer while being dispersed with an air nozzle.

There are 5 sets of roving cutters, and the cutting length is 354 mm.
g, O-ping yarn speed was set at 300 m/min.

A dump truck 6 was placed downstream of the belt feeder, and the reinforced loam soil 5 was stored on the loading platform.

The mixing ratio of fiber H weight to Kanto loam soil is 1.1%, 1
Axial compressive strength is 1. It was IKlf 10i.

Table 1 Example 2 The Kanto loam-soil 4 shown in Example 1 was fed onto a belt feeder 3 with a width of 7 m and a length of 7 m operating at a speed of 30 m per minute at a rate of 0.3 TrL3 per minute. The clod crusher 8 crushes it to an equivalent diameter of 2,051,111 mm or less, and supplies it while spreading it, and at a position near the upstream of the belt, a polyester no-crimp tow of 7.1 million denier (single yarn 1 degree 12 denier) is crushed.
was cut with Guruguru Cutter 2 and dispersed and sprayed with an air blower. For dispersion spraying, a belt feeder 3 equipped with a crusher 1118 of similar specifications from another series was used near the point.
After covering the Il mixed layer with the Kanto loam soil spread on top, the loam soil was piled up in the stockyard 6 from downstream of the belt feeder 3 to form tiAM reinforced soil 5.

Two sets of Guruguru cutters 2 were arranged, the IIN cut length was 511IIR, and the tow speed was 500'rrL/min.

The weight mixing ratio of fiber to Kanto loam soil is approximately 1.9%.
The uniaxial compressive strength was 1.8 Ngr/ai.

[Brief explanation of drawings]

FIG. 1 is a schematic side view of Example 1. 1 is a yarn feeding device, 2 is a combination of a roving cutter and an air nozzle, 3 is a belt feeder, 4 is Kanto loam soil,
5 is fiber reinforced earth and sand, 6 is a dump truck, and 7 is roving yarn. FIG. 2 is a schematic side view of the second embodiment. 1 is towing, 2 is a combination of a Guruguru cutter and an air nozzle, 3 is a belt feeder, 4 is Kanto loam soil, 5 is fiber reinforced earth and sand, 6 is a stockyard, 7 is a no-crimp dough, and 8 is a clod crusher. Figure 1! Figure 2!

Claims (1)

[Claims] A method for mixing earth and sand and fibrous materials, characterized in that the earth and sand and fibrous materials are mixed by laminating them in a thin layer and then allowing them to fall under their own weight.