JPH08164363A - Treatment of dredging earth and soil - Google Patents

Abstract

PURPOSE: To recycle dredging earth and soil by polishing stones, etc., in the dredging earth and soil to remove dull angle parts and crushing earth lumps and sand lumps, etc., then removing the mud, etc., sticking thereto to form gravel, sand and others in a crushing stage, and classifying the gravel, etc., with screens. CONSTITUTION: The dredging earth and soil charged into a hopper 1 are supplied to the screen 4 under addition of water 4 thereto and are then charged into a crushing machine 6, by which the dredging earth and soil are crushed with each other. Next, the earth and soil are sieved by the screen 7 to, for example, 25mm and the sizes smaller than this size. The earth and soil below 25mm are sieved by the screen 8 to >=5mm and the sizes below this size. The earth and soil failing to pass the respective screens 7, 8 are charged into an endless rubber body progressing under vibration of a sorter 9 and are collected as the gravel and the sand. The gravel and the sand are stored into storage tanks 10, 11. The endless rubber body has an ascending grade from mid-way and the earth and soil of the small sp. gr. which cannot climb the grade are discharged from the opposite side and are stored in a storage tank 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dredged earth and sand treatment method in which dredged earth and sand is treated and made reusable.

[0002]

2. Description of the Related Art Sediment flowing down from a river accumulates at a port into which the river flows, so that the sediment was regularly dredged.
The dredged material contains gravel, clay, silt, paper dust if a paper mill is nearby, and dust such as cans and bottles. For such treatment of dredged material, cement was mixed and piled up for several months, and then landfilled in the mountainous area.

[0003]

In the conventional landfill disposal, since the dredged soil contains salt, there is a possibility that the vegetation may be adversely affected and there is a limit in securing landfill disposal sites.

[0004] Therefore, an object of the present invention is to provide a method for treating dredged sediment which enables reuse of the dredged soil.

[0005]

In order to achieve the above-mentioned object, the present invention comprises a step of removing water having a size of n ₁ or more through a screen while adding water to dredged sand, and a method of removing the size n.
A dredged soil of less than ₁ is put into a rotating drum that rotates in one direction together with water, and it is eccentrically arranged inside the rotating drum and a plurality of scraping blades attached along the axial direction of the rotating drum. And a crushing process in which the dredged sand and sand are ground and crushed with each other by the holding blades mounted along the axial direction on the outer peripheral surface of the rotor that rotates faster and in the opposite direction than the rotating drum. The dredged material treated with 1. is sieved through one or several screens to a size n ₂ (n ₂ <n ₁ ) or more and a size n ₂ or less, and further a size n ₃ if necessary. (N
₃ <n ₂ ) A step of sieving into those above and below, and the dredged sand that has been sifted into each size is poured into the endless rubber band that is advancing while vibrating, and this endless rubber band In the dredged soil, the one with a large specific gravity is discharged from the end of the endless rubber band where the endless rubber band has been climbed up and the one with a small specific gravity It has a step of discharging from the reversal point on the opposite side and a step of sieving through one or several screens while adding the water obtained in the previous step to sand, gravel,
It is used for sieving into fine soil such as dust and slurry.

[0006]

According to the present invention, in the crushing step, stones and the like in the dredged soil are polished to remove sharp corners, and the lumps of sand and sand are crushed to remove adhering mud, gravel, sand, etc. It is possible to classify this with a screen, and further divide the oscillating endless rubber band into a climbed one and one that is not so quickly in a short time. You can get gravel. The waste can be disposed of or used for compost, and the slurry-like fine soil can be used as roadbed material, upland soil, etc. by compressing it with high pressure to form a cake of soil.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings.

In the flow chart shown in FIG. 1, the dredged material is put into the hopper 1 and the automatic feeder 2 is fed from the hopper 1.
Is supplied to the screen 4 while adding water 3. The screen 4 having a size of n ₁ or more, and in the embodiment, a size of 100 mm or more is excluded and stored in the storage tank 5.
The dredged material that has passed through the screen 4 is put into a crusher 6. The dredged material with a size of less than 100 mm is thrown into the rotary drum 61 which rotates in one direction together with water, and a plurality of scraping blades 62 and the rotary drum 61 are attached to the inner peripheral surface of the rotary drum 61 along its axial direction. With the holding blade 64 attached along the axial direction on the outer peripheral surface of the rotor 63 which is eccentrically arranged and rotates faster than the rotating drum 61 and in the opposite direction, the dredged sands are ground and crushed with each other. To do. Details of the crusher 6 will be described later. The dredged material discharged from the crushing machine 6 is screened at a location of the screen 7 into a size n ₂ or more and a size n ₂ or less, and here, it is screened to a size of 25 mm or more and a size of less than 25 mm. Those having a size of less than reach the next screen 8 where they are screened into those having a size of 5 mm or more and those having a size of less than 5 mm. Here, the water which has not passed through the screen 7 (size of 25 mm or more) and the water which has not passed through the screen 8 (size of 5 mm or more) are respectively added with water 3 and fed into the sorting machine 9. Although this sorter 9 will be described later, an endless rubber band 90 that advances while vibrating.
The dredged soil that has been added with water is collected as gravel or sand and stored in storage tanks 10 and 11, respectively. The endless rubber band 90 advances substantially horizontally toward the advancing direction and has an ascending slope in the middle thereof, and the one having a large specific gravity in the dredged soil is discharged from the point where the endless rubber band 90 has climbed up and turned over. Those having a small specific gravity that cannot climb this gradient are discharged from the reverse portion on the opposite side and stored in the storage tank 12. Those that have passed through the screen 8 (size less than 5 mm) are temporarily stored in the raw water tank 13 and fed into the classifier (cyclone) 15 by the pump 14.
One of the pieces classified by the classifier 15 is screened at a portion of the screen 16 into a size of 0.7 mm or more and a size of less than 0.7 mm. Further, the other one classified by the classifier 15 is divided by the contaminant screen 17 into the storage tank 12 and the slurry treatment step. The foreign matter screen 17 is screened to a size of 0.2 mm or more and a size of less than 0.2 mm. Those that have not passed through the screen 16 reach the sorting machine 9, those that have climbed up the gradient of this sorting machine 9 are stored in the storage tank 18, and those that have not climbed reach the slurry processing step. 5 mm for storage tank 18
Less than fine sand is stocked. In the slurry processing step,
The slurry-like fine soil is compressed under high pressure to remove water and form a cake of soil. This soil cake is processed and used as roadbed material and upland soil. What is stored in the foreign matter storage tank 12 is divided into those that can be used for compost and those that are to be disposed of.

The crusher 6 has a rotary drum 61 which rotates in one direction as shown in FIG. 2, and a rotor 63 is eccentrically arranged in the lower part of the rotary drum 61, and the rotor 63 rotates. It is designed to rotate faster and in the opposite direction than a rotating drum. The rotation of the rotary drum 61 is generated by driving the drive gear 6 of the motor 66 with the annular gear 65 provided on the outer peripheral surface.
This is done by engaging 7 The rotor 63 is provided with a rotary shaft 68, and the rotary shaft 68 is rotated by a drive mechanism 69. A charging chute 70 is attached to the inlet side of the rotary drum 61. When the rotation speed of the rotating drum 61 is set to 5 to 100 rpm, the rotor 6
The rotation speed of No. 3 is set to about 20 to 1000 rpm.

FIG. 3 is a schematic sectional view taken along line AA of FIG.
A plurality of scraping blades 62 are provided on the inner peripheral surface of the rotating drum 61, and a plurality of holding blades 6 are provided on the outer peripheral surface of the rotor 63.
4 shows a state where 4 is attached. The crushing process is mainly performed in the area indicated by reference numeral Z in FIG.

FIG. 4 is a diagram showing a processing state of the dredged soil Y in the area Z in FIG. Since the raking blade 62 moves along the rotation direction of the rotary drum 61, it scoops up the dredged soil Y, and the holding blade 64 moves along the rotation direction of the rotor 63, so that it acts to pull down the dredged soil Y. To do. The dredged material Y held by the holding blades 64 is
The scraping blade 62 collides with the sand and sand that is being scraped up, and a shearing force acts on this part. Further, since the interval between the blades 62 and 64 in the circumferential direction is the smallest in the region Z, the compressive force acts together with the shearing force, so that the dredged soil is crushed and polished. The space of the area Z shown in FIG. 3 is a location where the scraping blade 62 and the holding blade 64 are closest to each other,
A strong compressive force acts on the dredged material Y at this location. Regarding the shearing force, both blades 62 and 64 act as blades of scissors to remove the corners and deposits of the dredged sand Y, and the dredged sand Y held between each blade and the blade is rubbed together. Corners and deposits can be removed. Further, the rotor 63 is the rotating drum 61.
Since it is provided at the eccentric position, the compressive force that changes depending on the location is repeatedly applied to the dredged material. That is, since the compressive force acting on the dredged soil Y can be changed in a narrow space, the dredged soil Y can be divided into gravel, sand, and others.

Next, the sorting machine 9 will be described with reference to FIG.
This sorter 9 has an endless rubber band 90 that advances while vibrating.
The endless rubber band 90 advances substantially horizontally toward the direction of travel, and has a climbing slope from the middle. The main frame 91 is fixed to the ground by the support legs 92, and the main frame 91 has a climbing slope from the middle in the longitudinal direction. The main frame 91 is a parallel pair having a predetermined width, and a driving roller 93 and a driven roller 94 are attached to both ends of the main frame 91. A vibration frame 95 is attached to the main frame 91. Two
A turret 97 is provided so as to straddle a vibration frame 95 attached to each of a pair of parallel main frames 91 of the book, and a shaker 98 is attached to the turret 97. Shaker 9
When the turret 97 is operated, the turret 97 vibrates, the vibration of the turret 97 is transmitted to the vibrating frame 95, and the vibration of the vibrating frame 95 is not transmitted to the main frame 91. An endless rubber band 90 provided with corrugated standing walls 99 on both sides in the longitudinal direction is provided between the driving roller 93 and the driven roller 94. A large number of rotating rollers 100 are attached to the vibrating frame 95 so as to come into contact with each other along the width direction of the lower surface of the endless rubber band 90. Since the endless rubber band 90 is set to advance substantially horizontally toward the advancing direction and to have an ascending slope from the middle, the dredged sand that has been put into the endless rubber band 90 moves in the horizontal direction. It is supplied at a portion indicated by an arrow A in the figure. Those with a large specific gravity in the dredged material will climb up the climbing slope, and these will fall from the discharge hopper 101. A sprinkler 102 is provided midway in the traveling direction of the endless rubber band 90 to facilitate the removal of impurities having a small specific gravity. As shown in FIG. 6, the rotating rollers 100 are attached such that each pair of right and left is inclined so as to descend toward the center of the endless rubber band 90, and the center of the endless rubber band 90 that is placed on the rotating rollers 100 is recessed. No, the endless rubber band 90 in the width direction is slackened in a substantially arc shape. In FIG. 6, reference numeral 103 denotes an elastic member, which prevents the vibration of the vibrating frame 95 from being transmitted to the main frame 91. What is discharged from the discharge hopper 101 is adjusted according to the inclination angle and the distance of the climbing slope of the endless rubber band 90. That is, if fine sand is to be selected and collected, this climbing slope may be made gentle, and if gravel is to be collected, this climbing slope may be made strong. By using such a sorting device 9, the conventionally required reservoir is not required, and the entire structure is compact and simple,
You get what you want to sort quickly and accurately.

FIG. 7 shows a plan view of the entire apparatus, and the hopper 1
From the automatic feeder 2, the dredged sand is carried to the screen 4 via the belt conveyor 19, and the dredged sand that has passed through the screen 4 is crushed by the crusher 6. The dredged material discharged from the crusher 6 is screened by the screen 7 and the screen 8, and those that have not passed through the screens 7 and 8 are conveyed to the sorters 9 and 9 via the belt conveyors 20 and 21. . The storage tank 10 stores the size of 25 to 100 mm, and the storage tank 11 stores the size of 5 to 25 mm. Those that have not been sorted by these sorters 9, 9 are conveyed to a storage tank 12 for stock of contaminants via a belt conveyor 22. The material that has passed through the screen 8 is carried to the raw water tank 13 and is carried from this raw water tank 13 to the classifier 15.

[0014]

As described above, according to the present invention, the size n is passed through the screen while being added to the dredged soil.
A step of eliminating _one or more and a plurality of dredged sands having a size smaller than n ₁ are put together with water into a rotating drum that rotates in one direction, and are attached to the inner peripheral surface of the rotating drum along its axial direction. Of the dredging sand and sand with each other by the scraping blades and the holding blades mounted eccentrically in the rotating drum and mounted along the axial direction on the outer peripheral surface of the rotor rotating faster and in the opposite direction than the rotating drum, A crushing process for crushing each other and a size n ₂ (n ₂ <n ₂ <n ₂ <n ₂ <n
n ₁ ) or more and less than n ₁ ) and, if necessary, a size n ₃ (n ₃ <n ₂ ) or more and less than, and the size of each The dredged soil that has been sifted into the water is poured into the endless rubber band that is advancing while vibrating, and this endless rubber band advances in a substantially horizontal direction toward the advancing direction and becomes an ascending slope from the middle of the dredging. Discharging the one with a large specific gravity in the earth and sand from the point where the endless rubber band climbs up and turns over, and the one with a small specific gravity from the reverse point on the other side, It has a step of sieving through three or several screens and classifies the dredged soil into fine soil in the form of sand, gravel, dust, and slurry, so that the dredged soil can be reused. Further, since the crushing process and the sorting process using the endless rubber band can be continuously operated, a large amount of dredged sand can be efficiently treated.

[Brief description of drawings]

FIG. 1 is a diagram showing a flowchart of the present invention.

FIG. 2 is a side view of the crusher.

FIG. 3 is a simplified cross-sectional view taken along the line AA of FIG.

4 is an enlarged detailed view of a region Z in FIG.

FIG. 5 is a side view showing a sorter.

FIG. 6 is a schematic front view of a sorting machine.

FIG. 7 is a schematic plan view of the entire apparatus.

[Explanation of symbols]

 4,7,8,16,17 Screen 6 Crusher 9 Sorter 61 Rotating drum 62 Raking blade 63 Rotor 64 Holding blade 90 Endless rubber band

 ─────────────────────────────────────────────────── --- Continuation of the front page (72) Inventor Hiroaki Oba 41 Hamada-cho, Fuji-shi, Shizuoka Prefecture Daitoyo Construction Co., Ltd.Tago no Ura Works (72) Inventor Yoshiaki Wakasugi 6141 Chihama, Oto-gun, Shizuoka Waka Co., Ltd. Sugigumi

Claims (1)

[Claims] _1. A step of removing water having a size of n ₁ or more through a screen while adding water to the dredged sand, and throwing the dredged sand having a size of less than n ₁ together with water into a rotating drum that rotates in one direction. , A plurality of scraping blades mounted along the axial direction on the inner peripheral surface of the rotating drum and the shaft on the outer peripheral surface of the rotor which is arranged eccentrically inside the rotating drum and rotates faster and in the opposite direction than the rotating drum. A crushing process in which the dredged sand is ground and crushed by the holding blades installed along the direction, and the dredged sand processed in this crushing process is sized through one or several screens. A process of sieving n ₂ (n ₂ <n ₁ ) or more and less than n ₂ (n ₂ <n ₁ ) and less than n ₃ (n ₃ <n ₂ ) or more if necessary And each The dredged material that has been sifted into the ground is poured into the endless rubber strip that is advancing while vibrating, and this endless rubber strip is advanced almost horizontally toward the advancing direction and becomes a climbing slope from the middle. The one with high specific gravity in the dredged soil is discharged from the point where the endless rubber band climbs up and is reversed, and the one with low specific gravity is discharged from the reverse point on the opposite side, and the one obtained in the previous step is added. However, it has a step of sieving through one or several screens and classifies the dredged soil into fine sand in the form of sand, gravel, dust and slurry.