JPH084052A - Mud solidification pumping device - Google Patents

Abstract

(57) [Summary] [Purpose] An object is to provide a mud solidification pressure-feeding device that automatically and continuously adds and mixes the stored mud to a remote destination. . [Structure] A hopper 100, a vibrating screen 110, a mud tank 120, a tilting screw conveyor 210, a pressurizing pump 220, a discharge pipe 250, a flow meter 230 provided in the middle of the discharge pipe, a check valve 240, and compressed air blowing. A pressure-feeding device 200 including an ejector 260 is provided with a solidification agent addition device 300 including a solidification agent silo 310 and a solidification agent supply device 320.
It is configured to uniformly add and mix the solidifying agent to the mud and transfer it to a remote destination.

Description

Detailed Description of the Invention

[0001]

[Field of Industrial Application] The present invention relates to muddy soil dredged in rivers, lakes and harbors, and sewage sludge in sewage treatment plants.
The present invention relates to a mud solidification pressure-feeding device that uniformly adds a solidifying agent to dewatered sludge or the like and transfers mud to a remote destination such as a landfill by air transportation.

[0002]

2. Description of the Related Art Conventionally, in order to knead and solidify such mud, a certain amount of mud and a solidifying agent corresponding to this amount are put in a tank and mixed with a kneading machine having a stirring function attached to the tank, or portable. The mixture was uniformly mixed by manually stirring it using the stirrer of No. 1 or the mud and the solidifying agent put in the container were mixed by human manipulation using a construction equipment such as a backhoe.

[0003]

The above-mentioned kneading in the tank and kneading by the operation of the stirrer or the civil construction equipment are all batch processes, which not only take a lot of time and are complicated, but also mud feeding. , Operations such as solidifying agent addition, kneading, and discharging are performed intermittently, resulting in poor work efficiency.
It is difficult to quickly respond to the characteristics of the mud to be treated, for example, when the water content changes moment by moment, and it is not possible to mix an appropriate solidifying agent that matches the water content and specific gravity. There was a problem that the strength of the was not constant. For this reason, there has been a strong demand for a method of efficiently and automatically mixing a solidifying agent that matches the characteristics and weight of mud.

[0004]

In order to solve the above problems, the mud solidification pressure-feeding device of the present invention pressure-feeds the stored mud and uniformly mixes the solidification agent with the mud during the pressure-feeding. A mud solidification pressure-feeding device comprising a pressure-feeding device and a solidifying agent adding device, wherein the pressure-feeding device is provided with a hopper for receiving the mud, a vibrating sieve for removing foreign matter disposed under the hopper, and a viscous sieve immediately below the vibrating sieve. And a mud tank for mud storage equipped with a stirring device that stirs and scrapes the mud stored inside, and a tilting screw conveyor whose lower end is buried in the mud tank and which is tiltable, and a discharge port of the tilting screw conveyor. A pressurizing pump connected to the pressurizing pump, a discharge pipe subsequent to the pressurizing pump, a flow meter disposed in the middle of the discharge pipe, a check valve, and an ejector for injecting compressed air. The device comprises a solidifying agent silo and a subsequent solidifying agent silo, Serial is obtained is composed of a solidifying agent supply device to be connected to the compressed air supply line to the ejector.

[0005]

The mud solidification pressure-feeding device of the present invention transfers mud to a distant destination by air transfer, adds an appropriate amount of a solidifying agent corresponding to the flow rate of mud to the compressed air for air transfer, and mixes it. It is mixed and stirred with the mud flowing in the discharge pipe, and is transferred to the destination in a uniform mixed state. That is, the mud in the mud tank is transferred to the tilting screw conveyor by the stirring device, continuously and automatically sucked up by the tilting screw conveyor, pressurized by the pressure pump and discharged into the discharge pipe, and ejector. The compressed air injected from the inside of the pipe is transported by air by plug transportation.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 5 relate to an embodiment of the present invention,
FIG. 1 is an overall configuration diagram of the mud solidification pressure feeding device, FIG. 2 is a vertical cross-sectional view of the pressure feeding device, FIG. 3 is a plan view of the pressure feeding device, FIG. 4 is a front view of the pressure feeding device, and FIG. 5 is a usage example of the mud solidification pressure feeding device. It is a side view which shows.

As shown in FIG. 1, the mud solidification pressure-feeding device 1000 of the present invention is roughly composed of a pressure-feeding device 200 and a solidifying agent adding device 300. The pressure-feeding device 200 pressure-feeds mud collected by a dredging ship and mud at a sewage treatment plant to a remote destination by compressed air, and a hopper 100 and a vibrating screen 110 for removing foreign matter arranged below the hopper 100. A mud tank 120 for storing the mud that has passed through the vibrating screen 110 is provided, and two stirring devices 130 are arranged on the bottom surface of the mud tank 120 along the longitudinal direction of the bottom surface. The agitator 130 has a function of agitating the stored mud and further scraping it in the horizontal direction, and normally a paddle shaft having a paddle rotatable via an electric motor 130a is used. As shown in FIG. 2, the lower end of the tilting screw conveyor 210 that is tiltable around the pin joint 216c is buried in the center of the downstream position of the two stirring devices 130, 130. In the tilting screw conveyor 210, a rotary shaft 212 having a paddle fixed to the casing 211 coaxially with the casing 211 is rotatably attached via an electric motor 210a in a cylindrical casing 211, and inside the mud tank 120 from a suction port 214 at the lower end. The muddy soil is taken up and the muddy soil is discharged from the discharge port 215. In the tilting screw conveyor 210, a bracket 216a attached to the upper part is pin-joined to a base 216b via a pin joint 216c, and a hydraulic cylinder 217 pin-joined by a pin joint 217a and a pin joint 217b is tiltable. At the time of maintenance, a tilting support mechanism 216 for tilting the tilting screw conveyor 210 is provided in a state (horizontal state) indicated by a two-dot chain line in FIG. The screw rotation speed of the tilting screw conveyor 210 is 400 to 1200 rpm.
The rotational speed of the electric motor 210a is variable because the rotational speed is appropriately selected depending on the nature of the mud.

Discharge port 21 of tilting screw conveyor 210
The pipe 215a connected to 5 is connected to the pressurizing pump 220, and the mud pressurized by the pressurizing pump 220 rotationally driven via the electric motor 220a and the speed reducer 220b is disposed in the middle of the discharge pipe 250. Compressed air supplied by the compressor 262 is injected from the ejector 260 through the flow meter 230 and the check valve 240, and is transferred in the discharge pipe 250 by air transfer. Flow meter 230
The electromagnetic flowmeter of the principle of measuring the electromotive force induced by applying a magnetic field perpendicular to the flow direction according to the amount of passage of the mud is adopted, but other flowmeters may be used.

On the other hand, as described above, the solidifying agent adding device 300 is connected to a line for supplying compressed air to the ejector 260 mounted in the middle of the discharge pipe 250, and supplies the solidifying agent. It is composed of a silo 310 and a solidifying agent supply device 320. The solidifying agent silo 310 contains powder such as cement or cement-based solidifying agent, and the solidifying agent supply device 320 is, for example, a rotary feeder, a table feeder, a piston feeder or the like. Adopting a feeder, flow meter 2
The drive device is controlled according to the actual flow rate of the mud measured in 30, and the supply amount is adjusted. The solidifying agent may be a powder as it is or a slurry with water added, and the selection is determined by the degree of mixing depending on the soil. However,
Since it is more economical to use the powder as it is, use it as it is if there is no significant difference. Therefore, the solidifying agent may be supplied as a powder, but depending on the soil quality, a slurry with water added is desirable in order to uniformly mix it with mud. In the case of slurry-like addition, a storage tank equipped with a mixer (mixing stirrer) is provided in the solidifying agent supply device 320, and a water supply line is connected to the storing tank to make the powdery solidifying agent into a slurry and discharge it.
The solidifying agent is added at a ratio of 50 to 200 kg (usually 100 kg) to 1 m ³ of mud. FIG. 5 shows an example of use of the mud solidification pumping device 1000 of the present invention, in which the mud of the soil carrier 50 is put into the hopper 100 by the backhoe 60, and the solidifying agent is uniformly added to the remote destination as described above.・ Mix and transfer.

In the present invention, as described above, the amount of the solidifying agent powder or the amount of the solidifying agent which is commensurate with the flow rate of the mud is supplied from the compressed air supply line, which is a means for pumping the mud, to the mud that is pneumatically conveyed through the discharge pipe 250. To supply slurry with water added and mixed, it is evenly and evenly mixed with mud during plug transportation.
After reaching a remote destination, after a certain period of time (usually 2-7
It solidifies more than required strength in (day). That is, the addition amount of the solidifying agent is determined depending on the type of mud soil and how many kgf / cm ² of strength the material should have after a certain number of days. As a matter of course, the larger the added amount, the faster and harder the solidified. As described above, since the uniform mixing of the mud and the solidifying agent in the present invention is efficiently performed during the plug transportation in the discharge pipe, the length of the discharge pipe 250 is required to be at least 50 m.

[0011]

As described above, the mud-solidifying pressure-feeding device of the present invention performs mud feeding, transfer, solidifying agent feeding, kneading, and discharging automatically and in continuous operation. In addition, since a solidifying and kneading step is not required separately, an efficient and uniform mixed and solidified mud can be obtained.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a mud solidification pressure-feeding device according to an embodiment of the present invention.

FIG. 2 is a vertical sectional view of a pressure feeding device according to an embodiment of the present invention.

FIG. 3 is a plan view of a pressure feeding device according to an embodiment of the present invention.

FIG. 4 is a front view of the pressure feeding device according to the embodiment of the present invention.

FIG. 5 is a side view showing an example of use of the mud solidification pressure-feeding device of the present invention.

[Explanation of symbols]

 50 Soil carrier 100 Hopper 110 Vibrating sieve 120 Mud tank 130 Stirring device 130a Electric motor 200 Pressure feeding device 210 Tilt screw conveyor 210a Electric motor 211 Casing 212 Rotating shaft 213 Screw blade 214 Suction port 215 Discharge port 216 Tilt support mechanism 216a Bracket 216b Base 216c Pin Joint 217 Hydraulic cylinder 217a Pin joint 217b Pin joint 220 Pressurizing pump 220a Electric motor 230 Flow meter 240 Check valve 250 Discharge pipe 260 Ejector 262 Compressor 300 Solidifying agent adding device 310 Solidifying agent silo 320 Solidifying agent supplying device 320a Driving device 400 Control Device 1000 Mud solidification pumping device

Claims (1)

[Claims] 1. A mud solidification pressure-feeding device that pressure-feeds the stored mud and uniformly mixes the solidification agent with the mud during the pressure-feeding, comprising a pressure-feeding device and a solidification-agent adding device. Mud for storing mud, which includes a hopper for receiving the mud, a vibrating sieve for removing foreign matter disposed under the hopper, and a stirrer which is fixed immediately below the vibrating sieve and stirs and scrapes the mud stored inside A tilting screw conveyor having a lower end buried in the tank and the mud tank, and a tilting screw conveyor, a pressure pump connected to a discharge port of the tilting screw conveyor, a discharge pipe following the pressure pump, and the discharging. The solidifying agent adding device comprises a flow meter disposed in the middle of the pipe, a check valve, and an ejector for injecting compressed air. The solidifying agent adding device is connected to the solidifying agent silo and the solidifying agent silo, and a compressed air supply line to the ejector is provided. Consists of a solidifying agent feeder connected to Mud solidification pumping device.