JP3541204B2 - Dredged soil treatment method - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a dredged soil treatment method for treating dredged soil and making it reusable.
[0002]
[Prior art]
Sediment flowing down from the river accumulates in the port where the river flows, and this sediment was regularly dredged. The dredged earth and sand contains, in addition to gravel, clay, and silt, paper scraps if there is a paper mill nearby, and also trash such as cans and bottles. In the treatment of such dredged soil, the cement was mixed and piled up for several months, and then landfilled in mountainous areas.
[0003]
[Problems to be solved by the invention]
In the conventional landfill, salt is contained in the dredged soil, which may adversely affect the vegetation, and there is a limit in securing a landfill site.
[0004]
Therefore, an object of the present invention is to provide a dredged soil treatment method that enables the dredged soil to be reused.
[0005]
[Means for Solving the Problems]
To achieve the above object, the present invention is one comprising a first step of eliminating those through a screen size of n ₁ or more while hydrolysis in dredged material, the dredged material is less than the size n ₁ with water Into the rotating drum rotating in the direction of rotation, a plurality of scraping blades mounted on the inner peripheral surface of the rotating drum along its axial direction and arranged eccentrically in the rotating drum, faster and in the opposite direction than the rotating drum A second crushing step in which the dredged soil is polished and crushed with each other by holding blades attached along the axial direction to the outer peripheral surface of the rotating rotor, and the dredged soil treated in the crushing step. one or several through a screen size of _{n 2 (n 2 <n 1} ) with sieving and of less than the above ones, further size as required _n 3 _(n 3 _{<n 2} ) And more A third step of sieving to the full ones, hydrolysis and was charged to the third step on the endless rubber belt which travels while vibrating the dredged material which is sieved to the respective magnitude without passing through the screen, The endless rubber band travels almost horizontally at first in the direction of travel and has a climbing slope in the middle, so that the large specific gravity in the dredged sand is discharged from the point where it goes up and turns over the endless rubber band, and the specific gravity is increased. small ones a fourth step of discharging from the inversion point of the opposite side, a fifth step of sifting through one or several screens those obtained through the screen at a third step of And sieving the dredged soil into fine soil in the form of sand, gravel, dust, and slurry.
[0006]
[Action]
According to the present invention, in the crushing step, stones and the like in the dredged soil are polished to remove sharp corners, and crushed soil or sand lumps to remove adhering mud, thereby obtaining gravel, sand, and other materials. , which was classified with a screen, Ru can be accurately divided further to vibration shall be taken to climb the slope of the endless rubber band and the others are not in a short period of time. Furthermore , sand and gravel can be obtained by classifying those having a size smaller than a certain size using a screen. Garbage is disposed of or used for compost, and fine slurry-like soil is compressed at high pressure to make a soil cake, which can be used for roadbed materials, field soil, etc.
[0007]
【Example】
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
[0008]
In the flowchart shown in FIG. 1, dredged soil is put into a hopper 1 and supplied to a screen 4 while water 3 is added from the hopper 1 by an automatic feeder 2. It is n ₁ or the the screen 4 size, the size in the embodiment eliminates more than 100 mm, is stored in the storage tank 5. The dredged soil that has passed through the screen 4 is supplied to the crusher 6. The dredged soil having a size of less than 100 mm is put into a rotating drum 61 which rotates in one direction together with water, and a plurality of scraping blades 62 and a plurality of scraping blades 62 attached to the inner peripheral surface of the rotating drum 61 along its axial direction. The dredged soil and sand are polished and crushed by holding blades 64 mounted along the axial direction on the outer peripheral surface of a rotor 63 that is arranged eccentrically and that rotates faster than the rotating drum 61 and rotates in the opposite direction. I do. Details of the crusher 6 will be described later. Dredged material which has been discharged from the crusher 6 sieved and those of less than and more than point sized n ₂ of the screen 7, and sieved here and those of the less and more than 25mm is, 25mm Those having a size of less than 5 reach the next screen 8, where they are sieved into those having a size of 5 mm or more and those having a size of less than 5 mm. Here, those which did not pass through the screen 7 (size 25 mm or more) and those which did not pass through the screen 8 (size 5 mm or more) are each added with water 3 and put into the sorter 9. As will be described later with respect to the sorting machine 9, the dredged earth and sand added to the endless rubber band 90 that is vibrating while being vibrated is collected as gravel or sand and stored in the storage tanks 10 and 11, respectively. The endless rubber band 90 travels substantially horizontally at the beginning in the traveling direction and rises in the middle from the middle so as to discharge a material having a large specific gravity in the dredged soil from the point where the endless rubber band 90 is completely up and turned upside down. Those having a small specific gravity that cannot climb this gradient are discharged from the opposite reversal point and stored in the storage tank 12. What has passed through the screen 8 (less than 5 mm in size) is temporarily stored in a raw water tank 13 and is fed into a classifier (cyclone) 15 by a pump 14. One of the materials classified by the classifier 15 is sieved at a screen 16 into a screen having a size of 0.7 mm or more and a screen having a size of 0.7 mm or less. Further, the other one classified by the classifier 15 is divided by the impurity screen 17 into one going to the storage tank 12 and one going to the slurry treatment step. The contaminant screen 17 is sieved into a screen having a size of 0.2 mm or more and a screen having a size of less than 0.2 mm. Those that have not passed through the screen 16 reach the sorter 9, those that have climbed up the slope of the sorter 9 are stored in the storage tank 18, and those that have not climbed up reach the slurry processing step. Fine sand of less than 5mm is stocked in the reservoir 18. In the slurry treatment step, the slurry-like fine soil is compressed at a high pressure to remove water, thereby forming a soil cake. This soil cake is processed and used for roadbed materials and field soil. The impurities stored in the storage tank 12 are classified into those that can be used for compost and those that are disposed.
[0009]
The crusher 6 has a rotating drum 61 that rotates in one direction as shown in FIG. 2, and a rotor 63 is disposed eccentrically below the rotating drum 61, and the rotation of the rotor 63 is controlled by the rotating drum. It also rotates fast and in the opposite direction. The rotation of the rotary drum 61 is performed by meshing a drive gear 67 of a motor 66 with an annular gear 65 provided on the outer peripheral surface. The rotor 63 is provided with a rotating shaft 68, and the rotating shaft 68 is rotated by a driving mechanism 69. A charging chute 70 is attached to the entrance side of the rotating drum 61. The rotation speed of the rotating drum 61 is set to 5 to 100 r. p. m. , The rotation speed of the rotor 63 is 20 to 1000 rpm. p. m. Set to about.
[0010]
FIG. 3 is a simplified cross-sectional view taken along line AA of FIG. 2. A plurality of scraping blades 62 are provided on the inner peripheral surface of the rotary drum 61, and a plurality of holding blades 64 are mounted on the outer peripheral surface of the rotor 63. Indicates a state in which The crushing process is mainly performed in the area indicated by the symbol Z in FIG.
[0011]
FIG. 4 is a view showing a processing state of the dredged soil Y in the area Z in FIG. Since the scraping blades 62 move along the rotation direction of the rotary drum 61, they lift up the dredged soil Y, and the holding blades 64 move along the rotation direction of the rotor 63, so that the dredged soil Y is pulled down. I do. The dredged soil Y held by the holding blades 64 collides with the sediment being scraped up by the scraping blades 62, and a shearing force acts on this location. Further, since the interval between the two blades 62 and 64 in the circumferential direction is the narrowest in the region Z, the compressive force acts together with the shearing force, and the dredged soil is crushed and polished. The space in the area Z shown in FIG. 3 is where the scraping blade 62 and the holding blade 64 come closest to each other, and a strong compressive force acts on the dredged soil Y at this position. As for the shearing force, both blades 62 and 64 function as blades of scissors to remove corners and deposits of dredged soil Y, and dredged soil Y held between each blade is rubbed together. Corners and extraneous matter can be removed. Further, since the rotor 63 is provided at the eccentric position of the rotary drum 61, the dredged soil is repeatedly subjected to a compressive force that varies depending on the location. 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 the like.
[0012]
Next, the sorting machine 9 will be described with reference to FIG. The sorter 9 has an endless rubber band 90 that travels while vibrating, and the endless rubber band 90 travels almost horizontally in the traveling direction at first, and has an uphill gradient in the middle. The main frame 91 is fixed to the ground by supporting legs 92, and is provided with an ascending slope in the longitudinal direction of the main frame 91. The main frame 91 is a pair of parallel frames having a predetermined width, and a drive roller 93 and a driven roller 94 are attached to both ends thereof. A vibration frame 95 is attached to the main frame 91. A tower 97 is provided so as to straddle a vibration frame 95 attached to each of the two parallel main frames 91, and a vibrator 98 is attached to the tower 97. When the exciter 98 is operated, the tower 97 vibrates. The vibration of the tower 97 is transmitted to the vibration frame 95, and the vibration of the vibration frame 95 is not transmitted to the main frame 91. An endless rubber band 90 is provided between the driving roller 93 and the driven roller 94, and has a wavy standing wall 99 on both sides in the longitudinal direction. A large number of rotating rollers 100 are attached to the vibration frame 95 so as to contact the lower surface of the endless rubber band 90 along the width direction. Since the endless rubber band 90 is initially set to proceed substantially horizontally in the traveling direction, and is set so as to have an ascending slope from the middle thereof, the dredged earth and sand that has been input is such that the endless rubber band 90 advances in the horizontal direction. Is supplied at the portion indicated by the arrow A in the figure. Those with a large specific gravity in the dredged soil will go up the ascending slope, and they will fall from the discharge hopper 101. A sprinkler 102 is provided in the middle of the endless rubber band 90 in the traveling direction, so that impurities having a small specific gravity can be easily removed. As shown in FIG. 6, the rotating roller 100 is attached with a pair of left and right sides inclined so as to descend toward the center of the endless rubber band 90, and the center of the endless rubber band 90 that rides on the rotating roller 100 is recessed. Instead, 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 vibration 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 distance of the endless rubber band 90. In other words, if the fine sand is to be sorted and collected, the ascending gradient may be reduced, and if the gravel is to be collected, the ascending gradient may be increased. The use of such a sorting device 9 eliminates the need for a reservoir that has been required in the past, has a compact and simple structure as a whole, and can quickly and accurately obtain what is to be sorted.
[0013]
FIG. 7 shows a plane view of the entire apparatus. Dredged soil is transported from the hopper 1 to the screen 4 by the automatic feeder 2 via the belt conveyor 19, and the dredged soil passed through the screen 4 is crushed by the crusher 6. You. The dredged soil discharged from the crusher 6 is sieved by a screen 7 and a screen 8, and those not passing through the screens 7, 8 are conveyed to sorting machines 9, 9 via belt conveyors 20, 21. . The storage tank 10 stores 25 to 100 mm in size, and the storage tank 11 stores 5 to 25 mm in size. Those not sorted by these sorters 9, 9 are conveyed to a storage tank 12 for contaminant stock via a belt conveyor 22. What passed through the screen 8 is carried to the raw water tank 13, and is conveyed from the raw water tank 13 to the classifier 15.
[0014]
【The invention's effect】
As described above, the rotation according to the present invention, a step of eliminating water was added as through a screen size of n ₁ or more, while, the dredged material of size less than n ₁ in one direction together with water in dredged material Into a rotating drum, and a plurality of scraping blades attached to the inner peripheral surface of the rotating drum along its axial direction and eccentrically disposed in the rotating drum, and rotate faster and in the opposite direction than the rotating drum. A crushing process in which the dredged soil is polished and crushed by holding blades attached to the outer peripheral surface of the rotor along the axial direction thereof, and one or several dredged sands processed in the crushing process Sieving through the screen of the size n ₂ (n ₂ <n ₁ ) or more and less than the size n ₃ (n ₃ <n ₂ ) if necessary And The sieving process and the dredged soil sieved to each size are added to the endless rubber belt that vibrates while being vibrated, and the endless rubber band initially travels almost horizontally in the direction of travel. In the pre-process, the thing with a large specific gravity in the dredged soil is discharged from the point where the endless rubber belt is completely climbed and turned upside down, and the thing with a small specific gravity is discharged from the inverted point on the opposite side. Sieving the obtained material through one or several screens while adding water, and classifying the dredged sand into fine soil such as sand, gravel, dust, and slurry. Available. In addition, since the crushing step and the sorting step using the endless rubber band can be continuously performed, a large amount of dredged soil can be efficiently treated.
[Brief description of the 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 sectional view taken along the line AA of FIG. 2;
FIG. 4 is an enlarged detailed view of a region Z in FIG. 3;
FIG. 5 is a side view showing a sorting machine.
FIG. 6 is a simplified 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 Rotary drum 62 Raising blade 63 Rotor 64 Holding blade 90 Endless rubber band

Claims (1)

A first step of eliminating those through a screen size of n ₁ or more while hydrolysis in dredged material,
Polarized the size n ₁ less than dredged material was charged into a rotary drum which rotates in one direction together with the water, on the inner circumferential surface and rotating the drum in the axial direction a plurality of scraping up vanes mounted along the rotary drum A second crushing method in which dredged soil and sand are polished and crushed with each other by holding blades mounted along the axial direction on the outer peripheral surface of the rotor, which is arranged in the center and is faster than the rotating drum and rotates in the opposite direction. Process and
The dredged soil treated in this crushing step is sieved through one or several screens into one having a size of n ₂ (n ₂ <n ₁ ) or more and smaller than n ₂ (n ₂ <n ₁ ). A third step of sifting into those having a size of n ₃ (n ₃ <n ₂ ) or more,
In the third step, the dredged soil sieved to the respective sizes without vibrating the screen is added to the endless rubber belt which vibrates while vibrating, and the endless rubber band is initially substantially moved in the traveling direction. The dredged material with high specific gravity in the dredged soil is discharged from the point where the endless rubber belt is completely climbed and turned upside down, while the one with low specific gravity is discharged from the opposite inversion point so that it goes up horizontally and has a climbing slope from the middle . Step 4 ;
And a fifth step of screening those obtained through the screen via one or several screens in the third step,
A dredged soil treatment method characterized by classifying dredged soil into fine soil such as sand, gravel, dust, and slurry.

2. The method according to claim 1, wherein the dredged soil is classified into sand, gravel, dust, and slurry-like fine soil. A method for treating dredged sand and sand, comprising compressing water to remove moisture and forming a soil cake.

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