JPH11343634A - Method and device for solidifying and force-feeding dredged earth - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the kind of mounting apparatuses, to minimize the rotating part and to improve the operability by using a storage tank for receiving dredged earth also as a sludging tank, force-feeding the sludge prepared and discharged from the sludging tank, and kneading it with a solidifier by a kneading machine by use of the force-feeding force. SOLUTION: The dredged earth is put through a receiving device 2 by an input means 11 and stored in a sludging tank 1 used also as a storage tank, and fed into a piston pump 5 through a discharge port 4. The dredged earth is pressurized by the piston pump 5, pushed out by a prescribed quantity, and force-fed to a kneading machine 7 through a transfer pipe 6. While the sludge is passed in the inner part of the kneading machine 7 by the pressurizing force of the piston pump 5, a solidifier carried through an input pipe 8 is mixed to the sludge by the action of a fixed blade 7a attached to the inner wall and fed to the following sludge feed pipe 9. Accordingly, the number of mounting apparatuses and measuring instruments is minimized, the management and operation are facilitated, and solidifying and force-feeding of dredged earth can be efficiently performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dredged soil, such as sludge, mainly deposited on the seabed or the like, where a solidifying material is continuously added uniformly and solidified, and then sent to a landfill. And method for solidifying and pumping dredged soil.

[0002]

2. Description of the Related Art Conventionally, in order to solidify dredged mud such as sludge deposited on the seabed such as a harbor or the like, lakes, marshes, rivers, etc., a certain amount of mud and solidification commensurate with this amount are required. The material was kneaded with a mechanical kneader or the like, and this was pressure-fed to a landfill to be processed.

[0003] A mechanical kneader requires a large hydraulic source or electric power as a driving source, requires a large installation space for the device itself, and depending on the arrangement, a vertical screw feeder or a muddy water pump for transferring the kneader to the kneader. Was needed. Furthermore, since it is more difficult to specify the amount of mud with a vertical screw feeder or a mud pump than with a piston pump, a flow meter and a mud content meter were indispensable.

[0004] For this reason, there has been a keen need for a method and an apparatus for solidifying and pumping dredged soil with reduced operability, reduced number of rotating parts, and good operability.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a dredged soil solidification treatment pumping apparatus according to the first aspect of the present invention provides a dredging tank which serves as a receiving storage tank. Soil is stored, and the mud discharged from the mud tank is sent to a piston pump for sending mud, and cement mixed with a solidifying material such as cement slurry or powdered cement or a foaming agent into the mud extruded from the piston pump. It is characterized in that a solidifying material such as a slurry is fed to a predetermined place while being mixed.

A second aspect of the present invention is a dredged soil solidification treatment pumping apparatus, which comprises a mud adjusting tank also serving as a storage tank for the dredged soil, a mud adjusting action and a feeding action of the dredged soil provided in the mud adjusting tank. , A mud feeder connected to the discharge port of the mud tank, mud extruded by the piston pump, and solidification measured and input according to the feed amount of the mud. It is characterized by comprising a kneader for mixing the material and a subsequent mud pipe.

According to a third aspect of the present invention, in the above-mentioned dredged soil solidification processing pressure feeding device, a pressurizing means for compressed air is connected to a mud pipe subsequent to the kneading machine, and the pressurizing means is provided so as to be closed. When the pressure is near, the compressed air is put in a non-pressurized state and the pressure is fed only by the piston pump, and when the location of the pressure is far, the compressed air can be fed using the compressed air.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described based on embodiments shown in the drawings.

FIG. 1 is an arrangement system diagram showing an outline of a mud solidification treatment facility according to the present invention.

In the figure, (1) is a mud conditioning tank which also serves as a storage tank for receiving dredged soil such as sludge ooze introduced through the receiving device (2).

The receiving device (2) includes, for example, a receiving hopper (2c) provided with a primary grid or vibrating screen (2a) and a grizzly feeder (2b), a crushing device or a clay cutting device (2d) for breaking up a clay mass, a rock or the like. A secondary vibrating screen (2e) for removing other solid matter and a transfer chute (2f) for removing large foreign matter are provided.

The mud conditioning tank (1) is provided with a mud conditioning and feeder (3) for adjusting the degree of soft mud of the dredged soil stored therein and for feeding the dredged soil. Is smoothly discharged from the discharge port (4) and can be fed to a piston pump described later. In the case of the figure, the bottom of the mud tank (1) is inclined toward the discharge port (4), so that it easily flows to the discharge port (4). The mud conditioning feeder (3) may be any as long as it has both a stirring and mud regulating action and a feeding action. For example, a biaxial paddle type stirring body (3a) can be used.

(5) A piston pump for mud feeding connected below the outlet (4) of the mud tank (1), which pushes out the mud soil discharged from the outlet (4). It is provided so that it may be fed to a subsequent kneader (7) through a transfer pipe (6) connected thereto. The outlet pressure of the piston pump (5) is considerably higher than that of the centrifugal pump, and a higher pumping force can be obtained as compared with the centrifugal pump.

The kneader (7) is a fixed-blade type kneader as schematically shown in the figure. The kneader (7) flows through the kneader (7) under the pressure of the piston pump (5), thereby forming an inner wall. The stirring and kneading are performed by the action of the fixed blade (7a) attached to the above.

A pipe (8) is connected to an inflow side of the kneader (7) and is a pipe for feeding a solidifying material such as cement powder or cement slurry or a solidifying material such as cement slurry containing a foaming agent. However, in the solidified material supply device, the solidified material corresponding to the amount of the mud extruded from the piston pump (5) is measured and supplied in accordance with the amount of the mud, and the mud in the kneading machine (7) is supplied. It is going to be thrown in. Therefore, the mud is mixed with the kneading machine (7).
By passing through the inside, it is mixed with the solidified material.

A pressurizing means (10) for compressed air for transporting plugs is connected to a mud pipe (9) subsequent to the kneading machine (7). It can be pumped. In particular, the press-fitting means (10) is provided so as to be able to be closed appropriately. When the place for feeding the mud is near, the press-fitting means (10) is closed and the pressure is fed only by the piston pump (5). When the distance is far, the compressed air can be efficiently fed by utilizing the press-fit of the compressed air by the press-fit means (10).

The operation of the dredged soil solidification treatment pumping apparatus of the above embodiment will be described.

A receiving device (2) for receiving dredged soil conveyed by an earth transporting vessel by an input means (11) such as a backhoe bucket.
, A primary grid or vibrating screen (2a), a grizzly feeder (2b), a crusher or clay cutter (2d), a secondary vibrating screen (2e)
After that, it is stored in a mud conditioning tank (1) also serving as a storage tank, and is discharged from a lower discharge port (4) while performing mud conditioning by a mud conditioning feeder (3).

As described above, the mud conditioner is provided with a mud conditioner feeder (3) in the mud conditioner tank (1), which is also used as a storage tank for the received dredged soil and a mud conditioner for adjusting the degree of soft mud. And the feed function, it is possible to reliably feed the muddy soil to the subsequent piston pump (5) without having to provide a special feed means such as a horizontal screw.

The mud fed into the piston pump (5) is pressurized by the piston pump (5), extruded by a predetermined amount, and fed to a subsequent kneader (7) through a transfer pipe (6). . Especially piston pump (5)
The amount of extrusion by one piston action, that is, the amount of feed is determined. Even without a special flow meter, the amount of pumping can be controlled.

In the kneading machine (7), a solidification material feeding pipe (8) is connected to the inflow side thereof. Accordingly, a solidified material such as cement slurry or powdered cement corresponding to the feed amount is measured and supplied. Therefore, while the mud passes through the inside of the kneader (7) by the pressing force of the piston pump (5), the solidified material is mixed into the mud by the action of the fixed blade (7a) attached to the inner wall, and Of the mud pipe (9) is sent out.

A pressurizing means (10) for compressed air is connected to the mud feeding pipe (9). The compressed air is blown by the compressed air and sent to a predetermined place such as a landfill.
At this time, if the pumping place such as a landfill is a short distance,
The press-fitting means (10) is closed and the pressure is fed only by the piston pump (5). When the pressure-feeding place is relatively far away, the press-fitting is performed by using the press-fitting of the compressed air by the press-fitting means (10). do it. As a result, unnecessary compressed air is not blown, there is no waste, and it is economical.

Further, when the solidifying material fed into the kneading machine (7) is a cement slurry, the same processing as described above is performed by mixing a foaming agent into the slurry, so that the specific gravity is relatively light. A light-weight solidified product is obtained.

[0024]

As described above, according to the present invention, as a method and an apparatus for solidifying dredged soil such as sludge and pumping it to a landfill site, a storage tank and a mud tank for receiving the dredged soil are provided. By using the same, the mud that is conditioned and discharged from the mud tank is pumped by a piston pump, and by using the pumping force to knead the solidified material with a kneader, The number of equipment and instruments is small, the management and operability are easy, and the solidification and pumping process of dredged soil can be performed efficiently, which is economical.

[Brief description of the drawings]

FIG. 1 is an arrangement system diagram showing an outline of one embodiment of the present invention.

[Explanation of symbols]

 (1) Mud tank (2) Receiving device (3) Feeder combined with mud (4) Outlet (5) Piston pump (6) Transfer pipe (7) Kneader (7a) Fixed blade (8) Charge of solidified material Pipe (9) Sludge pipe (10) Press-fitting means for compressed air

Claims (3)

[Claims] Claims: 1. A dredged soil is stored in a mud tank serving also as a receiving storage tank, mud discharged from the mud tank is fed into a piston pump for mud feeding, and the mud extruded from the piston pump is mixed with cement slurry. Alternatively, a method for solidifying and pumping dredged soil, wherein the solidifying material is mixed with a solidifying material such as powdered cement or a cement slurry mixed with a foaming agent and is then fed to a predetermined place. 2. A mud tank which also serves as a storage tank for dredged soil,
A mud feeder that is provided in the mud tank and performs a mud adjusting action and a feeding action of the dredged soil, a mud feeding piston pump connected to the discharge port of the mud adjusting tank, and a pump pumped out by the piston pump. A kneading machine that mixes the mud to be mixed with the solidified material that is metered and charged according to the amount of feeding of the mud, and a subsequent sludge pipe for solidification processing and pumping the dredged soil. . 3. A compressed air press-fitting means is connected to the subsequent mud feed pipe of the kneading machine, and the press-fitting means is provided so as to be able to be closed. 3. The apparatus for solidifying and processing dredged soil according to claim 2, wherein the apparatus is configured to perform pressure feeding and to perform pressure feeding by using press-fitting of compressed air when the location of the pressure feeding is distant.