JPH028083B2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention continuously produces spherical particles that are laid on grounds and streets to prevent dirt and flying dust, and uses these particles to excavate raw materials. Concerning the method of backfilling and paving in places. In other words, the present invention involves the continuous construction of clay soil called Kanto loam, for example, which is made into powdered soil particles at an excavated location, and which is continuously sized into a spherical shape that is easy to level and then filled back into the excavated location. This invention relates to a paving method using granules.

(Conventional technology) Materials laid to prevent dust and flying dust caused by sticky soil such as the Kanto loam layer have traditionally been made of materials other than soil, such as asphalt pavement, artificial turf, and antuca. Things are common.

(Problems to be Solved by the Invention) When paving with a material other than soil as described above, there is a drawback that the process of transporting and storing the raw materials to the site is required, and moreover, a large storage space is required. In addition, grounds made of materials other than soil have poor elasticity and cannot provide the feel of soil. At the same time, they lack slippery properties, making them easy to fall over and cause accidents such as scratches and fractures, and they also have the disadvantage of poor water permeability, which tends to cause water puddles. The present invention aims to improve the various drawbacks associated with paving with materials other than soil, and involves preparing excavated clay soil on-site and continuously granulating it into spherical particles. The purpose is to backfill the excavated area and eliminate the aforementioned drawbacks.

(Means for Solving the Problems) According to the present invention, clay soil is first dried in an excavated area using a dryer to a state where it is easily crushed into clumps. This is an alternative to natural drying by air drying during traditional raw material storage. Next, the dried raw material is crushed and various impurities contained in the raw material (for example, gravel, bricks, plant roots, etc.) are removed using a vibrating sieve. The raw material consisting of powdered soil particles obtained in this way is weighed, and in order to impart plasticity and elasticity to the raw material, stabilizers and water are added to it according to the amount of raw material and thoroughly kneaded. Next, this plastic raw material is formed into short rod-shaped cylindrical pieces, and the raw material made into short cylindrical pieces is further rolled to continuously form into spherical particles, which are then placed in the excavated area. Backfill.

(Function) In the present invention, in order to granulate the clay excavated at the site into spherical particles and fill it back into the site, first, the soil at the excavated site is dried with a dryer to make it easier to crush. Then, this is properly crushed and passed through a vibrating sieve to remove impurities such as pebbles, resulting in clay particles that are suitable for kneading and do not clog the die during granulation. . Next, the soil particles of this clay soil are weighed, a stabilizer and water are added according to the amount, and the mixture is kneaded until it reaches a plastic range.Then, it is first granulated into cylindrical short pieces, and then continuously into spherical particles. Since the raw material is sized into large numbers of spherical particles, these are backfilled and spread out on the excavated site.

(Example) The paving method by continuous granulation of soil according to the present invention will be explained based on the example shown in the drawings.

The drawing is an overall view of the machinery and equipment used in the paving method of the present invention, in which 1 is a belt conveyor, 2 is a dryer,
3 is a lump crusher, 4 is a vibrating sieve, 5 is a weighing machine, 6 is a kneading machine, 7 is a belt conveyor, 8 is a granulator, 9 is a wire mesh conveyor, 10 is a granulator, 11 is a dryer 2
12 is a fan/heater that sends hot air to the wire mesh conveyor 9 or the grading machine 10.
It's a heater.

In this embodiment, raw materials excavated on site by a bulldozer are fed into a dryer 2 via a belt conveyor 1, dried, and then dropped into a crusher 3 to be crushed. Furthermore, if the raw materials contain moisture due to insufficient drying, This is transferred to the dryer 2 again by the belt conveyor.
to be completely dried. In this case, the belt conveyor 1 is stopped. Then, the vibrating sieve 4 sieves out coarse particles and foreign substances, and selects soil particles having a required size (less than or equal to the diameter of the die of the granulator 8).

The dryer 2 is a cylindrical body with a protrusion along the axial direction on the inner circumference, and one opening end thereof is inclined lower than the other, and while the cylindrical body is rotated, the raw material input from the higher opening end is fed into the burner. Hot air is poured onto the cylinder, stirred by the protrusions on the inner periphery, and transported along the slope of the cylinder, and then discharged from the machine through the low opening end.

A crusher 3 connected to the dryer 2 pushes the raw material into a cylindrical crushing roll having comb-shaped blades, and uses the blades to divide and crush the raw material.

Next, the soil particles taken out from the vibrating sieve machine 4 are sent by a belt conveyor to a weighing machine 5, where they are weighed.
Then, the weighed soil particles are put into the kneading machine 6, and a synthetic resin or cement stabilizer and water (approximately 60%) are mixed in at a weight ratio of 10 to 20% of the soil particles to form a plastic state. Stir and knead until combined.

In the kneader 6, the raw materials are rolled in a kneading tank by two rollers attached to a rotor, and a stabilizer and water are added therein and mixed.

Next, this is sent to a granulator 8 by a belt conveyor 7, where it is formed into short rod-shaped cylindrical pieces, and at the same time, it is continuously dried by a wire mesh conveyor 9, and then fed to a granulator 10.

The granulator 8 uses two meshing screws to extrude the raw material through a porous die and form it into short rod-like cylindrical pieces.

The granulator 10 rotates a spiral blade mounted in a cylinder, rolls the raw material along the plate surface, and sends the material downward in a whirlpool to form spherical particles. If hot air is constantly blown by the heater 12 to prevent the raw material from adhering to the inner wall of the sizing machine 10 during the process of forming spherical particles, the desired spherical particles can be formed accurately.

The spherical particles thus obtained are subsequently transported by a belt conveyor to the site excavated by a bulldozer, backfilled, leveled and paved.

(Effects of the Invention) When creating grounds or streets, the paving method according to the present invention omits the conventional process of transporting and storing excavated soil to another location, and instead uses excavated soil at the excavated location. The material is dried using a dryer, crushed to remove impurities, and then kneaded with a stabilizer and water depending on the amount, so the raw material exhibits good plasticity and is made into short cylindrical pieces. Not only that, but the powdered soil particles are not directly made into spherical particles, but are first made into cylindrical short pieces and then rolled into spherical particles, so that they are quickly and continuously made into spherical particles. Moreover, since the spherical particles prepared on site are subsequently backfilled into the excavated area, the space required for storage of leftover soil and various equipment during land reclamation work can be significantly reduced, and reclamation work can be carried out immediately on the spot. Grounds, roads, etc. made of spherical particles have appropriate elasticity and slip resistance, so you won't get injured even if you fall, and water will pass through between each particle, so even if it rains, no puddles will form. This effect is achieved.

[Brief explanation of drawings]

The drawing is an overall view of the machinery and equipment used in the present invention. 1 and 7 are belt conveyors, 2 is a dryer, 3 is a lump crusher, 4 is a vibrating sieve machine, 5 is a weighing machine, 6 is a kneading machine, 8 is a granulator, 9 is a wire mesh conveyor, 10 is a granulating machine, 11 and 12 are fan heaters.

Claims (1)

[Claims] 1. Dry the excavated clay soil in place using a dryer, crush the dried raw material, and remove impurities from the crushed raw material by sorting it with a vibrating sieve.
The raw materials with impurities removed are weighed, the weighed raw materials are mixed with a stabilizer and water and kneaded, the kneaded plastic raw materials are extruded and formed into short cylindrical pieces, and the short cylindrical pieces are rolled. A paving method by continuous granulation of soil, characterized by continuously forming soil into spherical particles by moving the soil, and then backfilling the soil into the excavated area.