JPH0551942A - Continuously solidifying device for water-containing sludge - Google Patents

Abstract

PURPOSE:To save power and improve a solidifying state by carrying the water- containing sludge of a solidifying agent adding quantity controlled in an optimum state, with a gutter-shaped belt conveyor, and by kneading the sludge with a plurality of rotary-blade-shaped paddles arranged at a gutter-shaped section. CONSTITUTION:A belt conveyor 3 with an upper section running-surface formed in a gutt-shaped trough is supported with load cells 13, and according to a sludge feeding speed, a belt speed is regulated. After that, in the trough of the conveyor 3, a plurality of rotary-blade-shaped paddles 5 are arranged, and by rotational frequency according, to the sludge feeding speed, Sludge is agitated. After that, via a piping 21 having a water content meter 33, the water-containing sludge can be fed, and the solidifying agent feeder of a rotary feeder 83 or the like is set. Besides, according to the feed quantity and water containing rate of the water containing sludge, a solidifying agent feeding speed is automatically controlled. Then, the speed of the conveyor 3 is regulated, and a sludge staying time in the trough is set, and the rotational frequency of the paddles 5 is regulated, and sludge mixing strength is regulated. As a result, a power cost can be extremely saved, and the property and hardness of the sludge can be made constant.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a continuous solidifying apparatus for efficiently solidifying hydrous mud having a high fluidity discharged from a civil engineering construction site, particularly a shield construction site excavating soft mud.

[0002]

2. Description of the Related Art A large amount of earth and sand is discharged to the ground during the foundation work of buildings and road excavation work for subways, but it is discharged from areas with abundant groundwater such as soft clay or gravel mixed silt soil. The earth and sand that contains a large amount of water becomes muddy soil,
Due to its high fluidity, it may be difficult to handle when temporary storage at the construction site or transportation to the dumping site occurs, and handling is difficult. It is a problem that the environment is deteriorated and the amount of waste soil itself is reduced, making it difficult to receive soil.

A method of reforming such a mud containing a large amount of water into a form that is easy to handle, and mixing and stirring a cement-based or lime-based solidifying agent or a liquid polymer-based solidifying agent to form a solid state However, if solidified into a lump, storage and transportation are extremely easy. Conventionally, paddle mixers, drum rotary mixers, screw mixers, etc. have been used for such kneading and mixing for solidification.

The present applicant has already proposed a continuous solidification system in which a high hydrous mud is supplied to a screw mixer together with a solidifying agent and mixed and stirred (Japanese Patent Application No. 63-3227).
No. 05), this screw mixer forms the bottom of the mixer body into a gutter shape with a flexible hard rubber plate, and a transfer screw and a kneading paddle are installed side by side on a rotating shaft inserted through the gutter. The structure was such that the screw rotation shaft was rotated by mounting the mixer bottom part and the screw outer edge in close proximity to each other. At the intake of the mixer, a liquid solidifying agent is sprayed and added, but the mud and the solidifying agent are mixed and stirred by the co-rotation of the paddle, and while solidifying, the rotation of the screw causes the mud to flow from the intake to the outlet. Be transferred. At this time, a system that continuously measures the supply rate and water content of the mud supplied to the intake port and automatically controls the optimum solidification agent addition rate required for solidification is adopted, and the appropriate amount from the discharge port. The solid material having the hardness of is continuously discharged. The solidified mud is easy to handle, and even if it is piled up and piled up in the open field, it will not be washed away and contaminated, and there will be no risk of spillage or scattering during truck transportation. Was effective in.

[0005]

In the above-mentioned continuous solidification system for hydrated mud, since the mixing and stirring and the transfer are simultaneously and continuously performed by the screw mixer, a large screw rotating torque is required and the driving motor has a high capacity. However, there is a problem in that the entire device becomes large. In recent years, with the increase in size of shield work, a solidification device having a capacity of 150 m ³ or more per hour is required as an earth removal treatment capacity, but in this case, the capacity of the motor reaches 300 kW. Also, since kneading and transfer in the screw mixer are performed with a single screw and paddle, it is necessary to rotate the screw at high speed or to increase the retention time of mud in order to increase the kneading efficiency. Though
Since it is not possible to control the transfer of mud and the mixing with the solidifying agent independently, it is possible that poor mixing may occur during large-scale processing, and soft mud may be discharged as it is uncured. In order to complete the kneading during the transfer, it was difficult to design the shape and arrangement of the screw and the paddle projecting on the outer circumference of the screw shaft.

The present invention solves the above-mentioned problems of the conventional solidifying apparatus such as a screw mixer for solidifying mud, has a small driving power, has a simple structure, and controls kneading and transfer separately and independently. The present invention intends to provide a continuous solidification device having high mud treatment efficiency.

[0007]

DISCLOSURE OF THE INVENTION The apparatus for continuously solidifying hydrated mud of the present invention comprises a belt which passes above a belt conveyor in which a flexible rubber belt runs between a pair of pulleys pivotally supported at both ends thereof. Both edges are bent upward, and as a generally semi-circular gutter-shaped trough part, inside the trough part of the upper belt, a rotating shaft with a plurality of paddles radially attached to the outer peripheral surface is attached to the belt to run around the belt. The belt conveyor is provided on the feeding side of the belt conveyor, and a feeding port for feeding the hydrated mud and blending the powdering agent and / or the liquid agent for solidification is provided, and the belt above the feeding port is provided. It is characterized in that the water-containing mud and the powder agent and / or the liquid agent charged above are mixed by the rotation of the paddle while passing through the trough portion by the rotation of the belt.

The present invention further comprises the above-mentioned continuous solidifying device for hydrous mud, a solidifying agent supplying device for supplying the solidifying agent from a storage tank for storing the solidifying agent to the charging port, and a weighing scale for measuring the weight of the belt conveyor. , An automatic control device for controlling the amount of the solidifying agent added, the automatic controller calculating the solidifying agent addition speed from the hydrous mud supply rate signal by the weighing scale, and supplying the solidifying agent with the solidifying agent addition speed signal Includes a continuous solidification system of hydrous mud adapted to control the solidifying agent feed rate of the apparatus.

[0009]

[Function] The trough part in which the belt passing above the belt conveyor is formed like a gutter is a kneading part, and the water-containing mud flowing in from the input port is cut by the rotating paddle while passing through this kneading part. Stirred by the blade, the solidifying agent and mud mixed at the same time are mixed and react with water to solidify.However, even if the mud is solidifying, the cutting edge of the paddle will shear the mud. Then, the unreacted solidifying agent is further pour into the mud and sheared while mixing, so that the mud is solidified in a lump and discharged from the conveyor discharge side as the belt moves.

Since the transfer of mud is carried out by moving the conveyor belt and the mixing and kneading is carried out exclusively by the rotation of the paddle, the required power of the motor for the transfer is much smaller than that of the screw mixer, and It's not something that pushes mud with a screw or paddle,
There is no need to install a screw on the paddle shaft, so the structure of the paddle is extremely simple and the rotational drive power required for mixing is small.

Since it is easy to independently and independently adjust the transfer rate of mud and the strength of mixing by paddle rotation, it is possible to optimize the properties and inflow of hydrous mud and the type of solidifying agent and its addition amount. It is possible to easily secure the mixing residence time, and it is extremely easy to immediately convert to a certain solidified mud in response to changes in the properties and inflow of hydrous mud.

Since a weight scale for sequentially measuring the weight of the belt conveyor is attached to the substrate of the belt conveyor of the present apparatus, the amount of water-containing mud flowing into the belt and the supply speed are measured to supply the water-containing mud. Since the solidifying agent is supplied at the solidifying agent supply speed set in proportion to the speed, the optimum amount of solidifying agent necessary for solidifying the mud can always be automatically supplied. It can be made into lumps, and mud will not flow out without being solidified.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A mud continuously solidifying apparatus of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of the main structure of the present apparatus. A pair of pulleys 4 and 41 are axially supported by the apparatus base 11, and a flexible rubber belt 3 is provided between the pulleys 4 and 41.
0 is stretched to form a belt conveyor 3, and a drive motor (with a variable speed reducer) 43 rotationally drives the discharge-side pulley 4 to rotate the belt 30.

The belt 30 running on the upper side of the belt conveyor 3 has a large number of rollers 7 laterally provided on the lower surface side thereof in the longitudinal direction of the belt conveyor 3 to support the belt 30. The side edge 31 is the side edge 3
1 is pushed and bent upward by the roller 71 supporting 1,
It forms a trough-shaped trough.

2 is a sectional view of the trough portion of the upper belt, the belt 30 of the trough portion has a roller 7 at the bottom.
And supported by a pair of side rollers 71, 71,
It is formed in an arc shape, and the upper side edge portion prevents the outer edge of the belt 30 from expanding outward by the pair of rollers 72, 72.

In FIG. 1, a rotating shaft 51 having several sets of paddles 5 attached at regular intervals is provided inside the trough portion of the upper belt 30, and a pair of suspending members 55 and 56 is provided at both ends thereof.
Is suspended from the lower end of the shaft and rotatably supported, and one end of the shaft is rotationally driven by a drive motor (with a variable speed reducer) 54. As shown in FIG. 3, the paddle 5 has four plate-shaped paddles 5 as a set and is attached to the rotary shaft 51, and the plate surface of the paddle is fixed substantially parallel to the rotation surface or slightly inclined. The rotation of the paddle 5 reduces the resistance when cutting through the mud.
The power to rotate the paddle is reduced. In this example,
Six sets of the paddles 5 are provided at equal intervals in the axial direction. As shown in FIG. 2, the relationship between the upper belt 30 curved in the shape of a trough and the paddle 5 is as shown in FIG. 2, in which the tip of the paddle 5 does not come into contact with the inner surface of the bottom of the belt formed by the rollers 7 and 71 in an almost arc shape. The suspension member 5 is arranged so as to
The suspension members 55, 56 are fixed by 5, 56.
Is fixed to the apparatus main body 1 independently of the base body 11 of the belt conveyor.

To give an example of the dimensions and capabilities of this mud continuous solidification device, the pulley interval of the belt conveyor is 9.0.
m, the length of the trough part as the kneading part is 5.6 m, the belt width is 1.3 m, the belt transfer speed is 36 m / min, and the diameter of the trough part is 0.5 m.
Processing of 0 m ³ / H is possible. In this case, the mud layer in the trough occupies about 70% of the height from the bottom of the belt to the paddle rotation axis, and the residence time in the trough is 9.3.
It becomes sec. Assuming that the paddle has eight sets of four blades, the rotation diameter is 0.5 m, and the rotation speed is 180 rpm, the shear pitch for mixing the mud during transfer by the paddle, that is, the mixing pitch is 12.5 mm. That is, from the discharge side of the belt conveyor, solidified mud in the form of lumps having a size of about 10 to 15 mm or particles of several mm is obtained. And
Under these conditions, the maximum load on the belt is 2000k
As g, the drive motor for the belt conveyor is 7.5k
With a capacity of W, and a drive motor for rotating the paddle, a capacity of 11 kW with a paddle adhesion coefficient of 25 kg / sec is sufficient. Therefore, the drive motor capacity and power consumption can be reduced to about 1/10 or less as compared with the conventional continuous solidification apparatus using a screw mixer.

On the loading side of the belt conveyor, a bottomless container-shaped loading port 2 is suspended on the upper belt 30.
When using this device, liquid hydrated mud is poured into this container.

FIG. 4 is a schematic cross-sectional view of an embodiment in which the powder solidifying agent storage tank 8 and the supply device 83 are provided side by side in the above-mentioned mud continuous solidification apparatus. In this example, the powdery solidifying agent is supplied to the hopper of the rotary feeder 83 by the elevator 82, and an appropriate amount of the powdery agent is supplied to the charging port 2 from the rotary feeder 83.

When using this apparatus, for example, liquid hydrous mud which is pressurized and discharged by a pump from a digging machine of the shield construction method is introduced into the inlet 2 through the pipe 21 and solidified from the rotary feeder 83. Belt 3 with agent
With the rounding of 0, they are sequentially transferred to the trough portion. In the trough, the liquid hydrous mud and the solidifying agent are mixed by the rotation of the paddle, and solidify as the solidifying reaction progresses,
Further, it is formed into a lump or a grain by the cutting shearing action by the paddle, and falls as solidified mud from the end of the belt conveyor.

In this apparatus, the supply rate of the water content in the mud is roughly estimated from the amount of the supplied water-containing mud and its water content, and the solidifying agent supply rate proportional to the water supply rate is the rotary blade of the rotary feeder 83. The rotation speed of the pulley 84 is adjusted, and the rotation speed of the drive motor of the pulley 4 is adjusted to determine the mud retention time in the trough portion by the traveling speed of the belt 30 of the belt conveyor. The rotation speed of the drive motor 54 of the shaft 51 can be adjusted to make the rotation speed of the paddle variable, and the mixing strength of mud can be adjusted. Therefore, in this apparatus, the mixing and stirring state most suitable for solidification can be realized in accordance with the supply amount and the property of the hydrated mud on the input side.

FIG. 5 shows the structure of a base body 11 incorporating the belt conveyor 3. The lower part of the base body 11 is fixed to the main body of the apparatus through a support member having load cells 13 and 13 attached thereto.

FIG. 6 shows the control system of the mud continuous solidification system. The belt conveyor 3 constantly measures the weight of the mud on the belt conveyor during the solidification process by the load cells 13 as shown in FIG. .. Load cell 13, 13
Calculate the feed rate of hydrous mud from the electrical signal from
The feed rate signal is converted into a solidifying agent feed rate signal proportional to the weight of the hydrated mud supplied to the upper belt 30 by the ratio setting device 61, and the feeder power adjuster 62 causes the rotary feeder drive motor M ₂ Control the rotation speed. Therefore, the solidifying agent can be constantly charged into the charging port 2 at a constant ratio with respect to the weight of the mud by following the fluctuation of the charging mud into the charging port 2, and the solidified mud from the discharge side can be removed. It can be controlled to a substantially constant solid state. In addition, the total weight of the hydrous mud that has been solidified can be calculated by integrating the supply rate of the hydrous mud, and the amount of excavated soil for shield construction can be known and used for construction management.

The pipe 21 for the liquid hydrated mud contains a moisture meter 2
2 is preferably attached, but the water content in the water-containing mud is electrically measured by the water content meter 22, and the electric signal is corrected by the water content compensator 66 by the controller 62 so that the water content is When it is high, the rotation speed of the motor M ₂ can be increased so as to increase the supply speed of the solidifying agent, and the shape and hardness of the solidified mud can be kept almost constant even if the properties of the hydrous mud change. It

Further, in this system, the rotation speed of the pulley 4 is controlled by the transfer controller 64 by an electric signal from the load cells 13, 13 of the supporting member for supporting the belt conveyor 3 so as to be proportional to the mud supply speed above a certain level. The belt feeding speed is adjusted by controlling the rotation speed of the paddle 5 by the mixing controller 64 at the same time to keep the layer thickness of the mud in the trough portion of the upper belt 30 as constant as possible. When is large, the number of rotations of the paddle 5 can be increased to enhance stirring.

In the above embodiments, an example in which a powder material is added as a solidifying agent has been shown, but a liquid solidifying agent may be used,
In this case, a liquid tank of the solidifying agent and a supply pump are attached, and in the control system, instead of the motor M ₂ of the rotary feeder, the drive motor of the pump or the flow rate adjusting valve on the pump outlet side thereof is controlled. Also, a system using both powder and liquid is of course available. As described above, the solidified mud obtained by modifying the hydrous mud to be solidified can be piled up in the open field and temporarily placed in the final place. It is landfilled like waste.

[0027]

[Effect] The following effects can be obtained by implementing the apparatus for solidifying water content of mud of the present invention. 1. The belt rolling on the upper side of the belt conveyor is shaped like a gutter, and as the trough, the paddle is rotated in the trough while transporting the mud by moving the belt, and the mud is cut and stirred, so it is easy to use as a solidifying agent. It can be easily formed into a solidified mud that has been mixed into a solidified mud by the shearing action of the paddle.

2. The transfer of mud during mixing and stirring is carried out by the belt conveyor, and the mixing and stirring is done independently by the rotation of the paddle.Therefore, less power is required for transfer and mixing, compared to conventional screw mixers with the same processing capacity. The required power may be 1/10 or less. Also, you can adjust the belt migration speed to adjust the retention time of mud in the trough,
Moreover, since the strength of mixing and stirring the mud with the solidifying agent is adjusted by the rotation speed of the paddle, the solidified mud having a substantially constant property can be easily obtained by the mixing treatment suitable for the water content and other properties of the mud.

3. Since the weight of the belt conveyor itself is constantly measured and a solidifying agent proportional to the mud supply rate can be automatically added, even if the water-containing mud supply rate changes momentarily, it will always have a constant hardness. It is possible to easily avoid a state where lumpy solidified mud is obtained and uncured mud flows out.

[Brief description of drawings]

FIG. 1 is a perspective view of a hydrous mud continuous solidification device.

FIG. 2 is a cross-sectional view of the trough portion of the upper belt of the hydrous mud continuous solidification device.

FIG. 3 is a side view (A) and a sectional view (B) of the paddle.

FIG. 4 is a cross-sectional view of the mud solidification device.

FIG. 5 is a front view (A) and a side view (B) of a belt conveyor of a continuous hydrated mud solidifying device.

FIG. 6 is a system diagram for automatic control.

[Explanation of symbols]

 1 Device Main Body 11 Base 2 Input Port 3 Belt Conveyor 30 Belt 4 Pulley 41 Pulley 5 Paddle 51 Paddle Rotating Shaft 7 Roller 8 Storage Tank 83 Solidifying Agent Supply Device

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Moriya Kageshige 3527 Higashioda, Kasaoka, Okayama Prefecture

Claims (2)

[Claims] 1. A belt which passes above a belt conveyor in which a flexible rubber belt runs between a pair of pulleys pivotally supported at both ends, both edges of which are bent upward by belt supporting rollers, It is not a trough-shaped trough, and inside the trough of the upper belt, a rotary shaft with a plurality of paddles radially attached to the outer peripheral surface is installed in the belt traveling direction, and is installed on the loading side of the belt conveyor. Is provided with an inlet for mixing the powdery and / or liquid agent for solidification with the addition of the hydrous mud, and the hydrous mud and the powdery agent and / or the liquid agent, which have been put on the upper belt from the port. Is mixed by rotating the paddle while passing through the trough part by the rotation of the belt. 2. The water-containing mud continuous solidification apparatus according to claim 1, a solidification agent supply apparatus for supplying the solidification agent from a storage tank for storing the solidification agent to the charging port, and a weight scale for measuring the weight of the belt conveyor. , An automatic controller for controlling the amount of the solidifying agent added, and by the controller, the automatic controller calculates the solidifying agent addition speed from the hydrous mud supply rate signal by the weighing scale, and the solidifying agent addition speed A continuous solidification system for hydrated mud, which controls the solidification agent supply speed of the solidification agent supply device with a signal.