JPH04293596A - Mixing tank for mud - Google Patents

Abstract

PURPOSE:To provide a tank uniformly mixing dredged mud and a solidifying agent. CONSTITUTION:By reducing the pressure in a tank main body 12 by a negative pressure pipe 26, dredged mud is charged in the tank main body 12 through a mud feed-in pipe 22. Cement milk is charged in the tank main body 12 from a solidifying agent feed-in pipe 24 and a stirring blade 54 is rotated by driving a motor 48 to uniformly mix the mud and the solidifying agent (cement milk). After mixing, compressed air is sent in the tank main body 12 through an air supply pipe 34 to feed out the mud from a mud taking-out pipe 28. Since the mixing of the mud and the solidifying agent is performed in the tank main body 12, the scattering of the mud or the generation of a malodor from the mud is eliminated.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mud mixing tank for discharging dredged mud after mixing it with a solidification material.

0002

[Prior Art] Mud dredged from lakes, rivers, etc. is transported to disposal sites such as landfills depending on the purpose, but generally dredged mud contains a large amount of water and has a bad odor. It very often becomes a source of pollution and harmful substances.

[0003] As a means of solving these problems, the general method is to add various treatment materials to make the mud odorless and harmless, and at the same time increase the strength of the mud by mixing a solidifying agent and solidifying it. It has been adopted.

[0004] Generally, this mixing of solidification materials involves putting mud and solidification materials into a large depression formed on the ground as a temporary storage area, leaving them for several days to promote solidification, and then transferring them from this depression to a landfill. The waste is transported and sometimes solidified at the final disposal site.

[0005]

[Problems to be Solved by the Invention] As described above, conventional depressions for mixing solidification material and final disposal sites are installed in an open state, which generates a bad odor to the surrounding area, and when stirring the mud after adding the solidification material, the mud is mixed. There are problems such as the particles being scattered around, and the installation location and work time are limited.

[0006] In consideration of the above-mentioned facts, the present invention aims to provide a mixing tank for mud that can uniformly mix mud and solidifying material without affecting the surroundings.

[0007]

[Means for Solving the Problems] A mud mixing tank according to the present invention includes a tank body, a mud feed pipe connected to the upper part of the tank body, and a mud feeding pipe connected to the upper part of the tank body to cause a negative load inside the tank. a negative pressure source that applies pressure to suction the mud from the mud inlet pipe into the tank body; a mud removal pipe that communicates with the lower part of the tank body; and a solidification material supply means that supplies the solidification material into the tank body; It has a stirring means for mixing mud and solidifying material within the tank body, and an air supply means for feeding compressed gas into the tank body and sending out the mixed mud.

[0008]

[Operation] The dredged mud is introduced into the tank body from the upper part through the mud inlet pipe and mixed with the solidification material from the solidification material supply means. In addition to supplying the solidifying material directly to the tank body, this solidifying material supply means also supplies the solidifying material to a part of the mud inlet pipe, and feeds the mud into the tank body with the solidifying material mixed in advance. You may also send it as The mud is accelerated into the tank body by negative pressure from a negative pressure source provided at the top of the tank body. The stirring means mixes the mud and the solidifying material in the tank body, and after this mixing is uniformly performed, the air supply means discharges the mixed mud from the mud removal pipe. Since the negative pressure source is communicated with the upper part of the tank body, the tank body charged from the mud feed pipe will not unnecessarily enter the negative pressure source.

[0009]

Embodiment In the present embodiment shown in FIGS. 1 and 2, the tank body 12 has a cylindrical shape with its axis disposed horizontally, and is mounted on a frame 13. Both ends of the tank body 12 in the axial direction are closed with end plates 14 and 16.

[0010] A feed pipe 22 is connected to a position above the vertical center of the tank body 12 via a small cylindrical portion 18 . A tip (not shown) of the feed pipe 22 communicates with the river bottom, and has the role of guiding mud to the tank body 12.

Adjacent to this small cylinder portion 18 is a solidifying material feed pipe 2.
4 are connected. This solidification material feed pipe 24 is configured to feed a required amount of cement milk, which is a solidification material, into the tank body 12 from a cement milk supply device (not shown).

Similarly, one end of a negative pressure pipe 26 is connected above the center of the tank body 12. This negative pressure pipe 2
The tip (not shown) of the tank 6 is connected to a negative pressure source such as a vacuum pump, and the inside of the tank body 12 is brought into a negative pressure state to facilitate the introduction of mud from the feed pipe 22.

[0013] A mud removal pipe 28 is connected to the lower part of the tank body 12, facing the small cylinder part 18. This mud removal pipe 28 has an on-off valve 32 in the middle, and a tip (not shown) is led to a transport vehicle or a landfill.

One end of an air supply pipe 34 communicates between the solidifying material feed pipe 24 and the negative pressure pipe 26, and the other end is connected to a compressed gas supply source such as a compressor (not shown). This air supply pipe 34 has the role of feeding compressed air into the tank body 12 and forcing the mud in the tank body 12 into the mud removal pipe 28. A branch pipe 36 communicating with a part of the air supply pipe 34 opens into a part of the mud removal pipe 28 and connects the mud removal pipe 28.
It is designed to promote the removal of mud from within.

A rotating shaft 38 is arranged at the axial center of the tank body 12, and bearings 42, 44 provided on the end plates 14, 16
It is supported by a shaft. The tip of the rotary shaft 38 protruding from the bearing 44 is connected to a motor 48 via a deceleration means 46 . A stirring blade 54 is fixed to the rotating shaft 38 within the tank body 12 via an arm 52 that projects in the radial direction. The stirring blades 54 are flat blades arranged at an angle with respect to the rotating direction, and the rotational force of the motor 48 is transmitted through the rotating shaft 38 and the arm 52, thereby uniformly stirring the mud and solidified material in the tank body 12. It has the role of This stirring blade 5
4 are provided in a plurality at appropriate intervals in the longitudinal direction of the rotating shaft 38.

Inside the tank body 12, a plurality (three in this embodiment) of mud sensors 56 are arranged at appropriate intervals along the axial direction of the tank body 12 near the top thereof. These mud sensors 56 are preferably connected to the tank body 12.
The height of the mud inside the tank body 12 can be detected by emitting ultrasonic waves downward and by the time it takes to receive the reflected waves of the ultrasonic waves. ing. Since a plurality of mud sensors 56 are provided along the longitudinal direction of the tank body 12, the volume of the mud inside the tank body 12 can be accurately determined even when the mud that has been put in is piled up in a mountain shape. be able to.

Each pipe other than the mud removal pipe 28 is also provided with an on-off valve similar to the on-off valve 32 in its intermediate portion.

Next, the operation of this embodiment will be explained. This tank body 12 is installed between a dredging site and a landfill site, and can take out mud from the dredging site and send it to the landfill site. That is, after closing the mud removal pipe 28 and the air supply pipe 34, negative pressure is applied from the negative pressure pipe 26 to the tank body 1.
2, the dredged mud is drawn into the tank body 12 via the feed pipe 22. Simultaneously with or before or after the introduction of mud from the feed pipe 22, solidifying material is supplied into the tank body 12 from the solidifying material feeding pipe 24.

Here, as the solidifying agent, (1) 3CaO.
SiO2, 2CaO・SiO2, 3CaO・Al2
Ordinary Portland cement whose main components are O3,4CaO・Al2O3・Fe2, (2) 11CaO
・7Al2 O3 ・CaX2 (in the formula, X represents a halogen compound) and 3CaO・SiO2 , 2CaO・
SiO2 ,4CaO・Al2 O3 ・Fe2 O3
Ultra-fast hardening cement mainly composed of (3) CaO, C
A lime-based material whose main component is a(OH)2, (4) a cement-based solidifying material for soft soil consisting of adding gypsum to the above-mentioned main component, (5) epoxy resin, urea resin, lignin,
Polymer materials containing acrylamide as a main component, (6) silicic acid materials containing water glass as a main component, and (7) bituminous materials such as asphalt emulsion are preferably used.

[0020] When mixing the cements (1) and (2) above with the lime-based material (3), it is also possible to add (5)
The polymeric materials of ) and the bituminous materials of (7) can be added as curing aids. Moreover, these solidifying materials can be applied in any of powder, liquid, and slurry forms. Furthermore, a deodorizing agent can also be mixed in together with these solidifying materials, and by mixing the deodorizing agent, it is possible to prevent the occurrence of bad odors in the mud.

[0021] The gypsum-based material added to the above-mentioned cement-based solidifying agent for soft soil has a characteristic reaction in which minerals are bound to water in the mud with a high water content ratio due to the action of the gypsum added to the mud. occurs as shown in the following equation.

[0022]

[Math 1]

3CaO・Al produced by this reaction
2 O3 ・3CaSO4 ・32H2 O is a needle-shaped crystal that combines with a large amount of water, and if it is in the ground where there is a lot of moisture and little air permeation, oxidation does not progress and the ground becomes highly stable.
Therefore, it is extremely effective in solidifying mud.

As shown in FIG. 1, the inlet pipe 22 and the solidifying material inlet pipe 24 are placed on one side of the tank body 12, and the negative pressure pipe 26 is placed on the other, and at the top of each, so that mud and solidifying material are not deposited. It will not be taken out from the negative pressure pipe 26 unnecessarily. The mud sensor 56 detects that the volume of the introduced mud reaches a predetermined value, and the motor 48 is driven to rotate the stirring blade 54 before or after the mud and solidification material are added, and the mud and solidification material are mixed. Stir evenly.

When the stirring is completed, compressed air is supplied from the air supply pipe 34 to the upper part of the tank body 12, so that the on-off valve 3
2 is opened, the mud after mixing is taken out from the mud removal pipe 28. The removal by opening the on-off valve 32 may be carried out after a predetermined period of time has elapsed after the mud and solidifying material have been mixed, thereby retaining the mud in the tank body 12 until the mud reaches a desired viscosity. No foul odor is generated during these mixing, stirring, and solidification promotion operations. The on-off valve 32 is also used when removing mud after mixing.
Since it is arranged at the upper part of the tank body 12, the mud is effectively discharged from the mud removal pipe 28. In addition, in FIG. 1, by setting the right side of the tank body 12 at a higher position than the left side, it is possible to effectively charge and send out mud. Further, it is preferable that the mud feed pipe 22, the solidification material feed pipe 24, and the negative pressure pipe 26 are connected to each other above the upper and lower intermediate portions of the tank body 12.

[0026] In this way, in this mixing tank, the loading and unloading of mud into and out of the tank body can be used as the transport force for dredged mud, so it is possible to transport dredged mud over a relatively long distance.

[0027]

Effects of the Invention Since the present invention has the above-described structure, it has an excellent effect in that when mixing the solidifying material of dredged mud, there is no adverse effect on the surroundings and uniform mixing and agitation is possible.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway front view showing an embodiment of a mixing tank according to the present invention.

FIG. 2 is a right side view of FIG. 1.

[Explanation of symbols] 12 Tank body 22 Infeed pipe 24 Solidifying material feed pipe 26 Negative pressure pipe 28 Mud removal pipe 34 Air supply pipe 38 Rotation axis 48 Motor 54 Stirring blade 56 Mud sensor

Claims (1)

[Claims] Claim 1: A tank body, a mud inlet pipe connected to the upper part of the tank body, and a mud inlet pipe communicated with the upper part of the tank body to make the inside of the tank a negative pressure and transfer the mud from the mud inlet pipe into the tank body. a negative pressure source for sucking the mud, a mud removal pipe connected to the lower part of the tank body, a solidification material supply means for supplying the solidification material into the tank body, and an agitation means for mixing the mud and solidification material within the tank body. A mixing tank for mud, comprising: an air supply means for feeding compressed gas into the tank body to send out mixed mud.