JPH0780498A - Solidifying device for slurry - Google Patents

Abstract

PURPOSE:To provide a slurry-solidifying device that has a good kneading perfor mance and an efficient solidification treating work. CONSTITUTION:A solidifying device for slurry is equipped with a kneading drum 4 which is rotated and driven around a horizontal rotary center shaft C. A slurry hopper 11 for storing slurry is arranged at one side of the kneading drum 4. The supply nozzle 14 of a solidifying agent is installed in the kneading drum 4 and also a screw conveyor 12 is attached by which slurry D is supplied from the slurry hopper 11 to the kneading drum 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for solidifying mud produced by dredging, excavation of foundation work, shield method, or the like.

[0002]

2. Description of the Related Art Although mud and sludge are generated during construction such as dredging, it is generally difficult to carry them out by truck or the like as they are.

Therefore, regarding these sludges,
Depending on the amount of water contained and the concentration of sludge,
It has been practiced to solidify the mud by coagulating and settling it or by adding a solidifying agent and kneading it into a so-called cake that can be carried out.

As a conventional solidifying apparatus for adding a solidifying agent and kneading, so-called concrete mixer type and screw conveyor type are used.

[0005]

The mixer type solidifying device for concrete has good kneading performance, but the solidifying process of mud is batch type, and the solidifying process is not efficient.

In the screw conveyor type solidifying device, the solidifying process can be carried out continuously, so that the solidifying process is efficient, but the kneading time of the mud is short and the kneading is good. The performance cannot be stably exhibited.

The present invention has been made under such circumstances, and it is an object of the present invention to have good kneading performance and to efficiently carry out the solidification treatment work of mud.

[0008]

In order to achieve this object, the invention according to claim 1 is provided with a kneading drum which is rotationally driven around a horizontal center axis of rotation, and mud is provided on one side of the kneading drum. A mud hopper for storing is arranged, a solidifying agent supply nozzle is installed in the kneading drum, and a screw conveyor device for supplying the mud soup from the mud hopper to the kneading drum is provided.

[0009]

According to the first aspect of the present invention, the mud from the mud hopper is supplied to the kneading drum via the screw conveyor and is kneaded with the solidifying agent from the solidifying agent supply nozzle in the kneading drum. The kneading with the solidifying agent of soybean can be continuously performed, and the solidifying work by kneading is efficient.

The supply amount of mud to the kneading drum can be adjusted by adjusting the rotation speed of the screw conveyor, and the rotation speed of the kneading drum and the supply amount of the solidifying agent from the solidifying agent nozzle. Since it is easy to adjust, good kneading performance can be exhibited.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in the drawings.

In FIG. 1, 1 is a solidification device for mud, 2 is a mud supply device, 3 is a solidifying agent supply device, 4
Is a kneading drum, and 5 is a belt conveyor that conveys the solidified sludge.

The mud supply device 2 has a hopper 11 for storing the mud D, and a screw conveyor 12 installed below the hopper 11.

In the screw conveyor 12, the screw shaft 12a is rotationally driven by an electric motor 12b whose rotation speed can be freely adjusted, and as a result, the amount of the sediment D transferred by the screw conveyor 12 is the electric motor. It can be adjusted appropriately by adjusting the rotation speed of 12b.

When the solidifying agent is a liquid agent, the solidifying agent supply device 3 is installed at the solidifying agent conduit 13 communicating with a pump (not shown) for pressurizing the solidifying agent and the tip of the solidifying agent conduit 13. The solidifying agent supply nozzle 14 is provided.

In this embodiment, two solidifying agent supply systems A and B, which are independently formed, are provided so that two different types of solidifying agents can be independently supplied.

When a powdery solidifying agent is used, the solidifying agent supply device 3 may be constructed by using an air compressor instead of the pump.

In this embodiment, the sludge feeder 2 and the solidifying agent feeder 3 are fixedly installed on a base 16 installed on one side of the kneading drum 4.

The kneading drum 4 is formed into a substantially cylindrical shape, and dam portions 4a and 4b, which are ring-shaped ribs protruding inward, are formed on both side ends of the kneading drum 4.

In the following, these dam portions 4a, 4b
Of these, the dam portion 4 installed at the end of the kneading drum 4 on the side of the mud supply device 2 (hereinafter referred to as the inlet end)
a is referred to as an inlet-side dam portion, and the dam portion 4b installed at the opposite end portion (hereinafter referred to as an outlet-side end portion) is referred to as an outlet-side dam portion.

The overhang height T of the outlet side dam portion 4b is set smaller than that of the inlet side dam portion 4a.
This is because, as will be described later, the solidified slurry D gets over the exit side dam portion 4b and is discharged onto the belt conveyor 5 outside the kneading drum 4.

The height T of the outlet side dam portion 4b is determined by the mixing drum 4 of the sludge D supplied into the mixing drum 4.
Since this is an element for setting the staying time inside, the staying time can be adjusted by forming the outlet side dam portion 4b as shown in FIG.

In this case, as shown in FIG. 4, the outlet side dam portion 4b is formed separately from the kneading drum 4 so as to be attachable and detachable, and the outlet side dam portion 4b is formed as a separate annular structure. A plurality of members having different heights T are prepared in advance under a constant outer diameter D, and the kneading drum 4 is appropriately selected from them.
And the outlet side dam portion 4b may be formed by attaching it to the.

The kneading drum 4 is supported on its outer peripheral surface by a tire roller 17 arranged below, and is rotatable about a horizontal center axis C of rotation.

This kneading drum 4 is, as shown in FIG.
A ring 22 is attached to the outer circumference of the kneading drum 4, and a chain 22 is wound around the ring gear 21 and the power of an electric motor 23 is transmitted to the kneading drum 4 so that the kneading drum 4 is rotated around the rotation center axis C. It has become.

The rotation speed of the electric motor 23 for rotating the kneading drum 4 is variable like the electric motor 12b, and the rotation speed of the kneading drum 4 can be adjusted appropriately.

In such a kneading drum 4, the tip of the screw conveyor 12 of the mud supply device 2 is inserted along the rotation center axis C on the rotation center axis C inside the inlet side dam portion 4a. The mud D from the hopper 11 is supplied into the kneading drum 4 (see FIG. 3).

When the fluidity of the sludge D is particularly high, as shown in FIG. 5, a throttle valve 12d that can be opened and closed is installed at the tip of the screw conveyor 12 to move it into the kneading drum 4. It is possible to accurately control the supply amount of the mud D.

At the end of the kneading drum 4 on the inlet side, two independent solidifying agent supply systems A and B of the solidifying agent supply device 3 are passed through the inner space of the inlet side dam portion 4a.
Both solidifying agent pipes 13 are inserted into the upper side of the screw conveyor 12, and the solidifying agent supply nozzle 14 of the solidifying agent supply system A is solidified in the solidifying agent supply system B at a position slightly ahead of the screw conveyor 12. The agent supply nozzles 14 are installed downward in the vicinity of the central portion in the axial direction of the kneading drum 4.

This is because the solidifying agent of the solidifying agent supply system A is first mixed into the slurry D supplied into the kneading drum 4 by the screw conveyor 12 and then uniformly mixed into the slurry D, and then the solidifying agent is supplied. This is because by mixing the solidifying agents of the system B, the solidifying effect of the slurry D by these solidifying agents is uniformly generated in the whole of the slurry D.

At the end of the kneading drum 4 on the outlet side, a belt conveyor 5 is disposed below the kneading drum 4, solidified in the kneading drum 4, and passed over the outlet side dam portion 4b to drop the mud D. It is designed to receive and carry it out.

Further, the kneading drum 4 is provided with an auxiliary kneading device 26 and a scraping device 27.

The auxiliary kneading device 26 has a kneading blade 26c, which is a spiral blade, installed on a rotary shaft 26b rotatably driven by an electric motor 26a. As shown in FIG. It is installed in a holding state and extends below the screw conveyor 12 in the kneading drum 4 in a direction parallel to the screw conveyor 12.

The electric motor 26a can be switched between forward and reverse rotations, and its rotation speed can be appropriately adjusted in the same manner as the electric motors.

Since the auxiliary kneading device 26 is installed at such a position, the screw conveyor 12
The mud D supplied from is dropped onto the auxiliary kneading device 26 and is supplied, and since the position of the auxiliary kneading device 26 is low in the cross section of the kneading drum 4, the mud D is likely to concentrate. The efficiency of partial kneading of mud D described below is good.

The scraping device 27 has a scraping blade 27c, which is a spiral blade, mounted on a rotary shaft 27b which is driven to rotate by an electric motor 27a, in a cantilevered state, similar to the auxiliary kneading device 26. Thus, it is installed above the screw conveyor 12 and slightly parallel to the screw conveyor 12 at a position on the near side in the rotation direction of the kneading drum 4.

The outer edge of the scraping blade 27c of the scraping device 27 is installed so as to rotate via a position close to the inner peripheral surface of the kneading drum 4, and as shown in FIG. Mud D adhering to the inner surface of drum 4
The auxiliary kneading device 26 scrapes off the sludge D while scraping it off at the outer edge of the scraping blade 27c to reduce the adhesion of the sludge D on the screw conveyor 12.
To reach.

Incidentally, also in the electric motor 27a,
The rotation speed thereof can be adjusted appropriately, and the scraping blade 27c is adapted to match the rotation speed of the kneading drum 4.
By adjusting the rotation speed of No. 3, the scrap D adhering to the inner peripheral surface of the kneading drum 4 can be efficiently scraped off.

The kneading of the mud D in the kneading drum 4 of the solidifying device 1 thus constructed is as follows.

First, rotation of the kneading drum 4 (indicated by arrow R in the figure)
The kneading action of the mud D accompanying the rotation direction of the kneading drum 4) will be described. As shown in FIG. 6, the mud D supplied from the screw conveyor 12 is accumulated in the lower part of the kneading drum 4.

Since the kneading drum 4 rotates, the mud D accumulated in the lower portion is lifted from the side as the kneading drum 4 rotates, and when the mud D reaches the upper portion, the mud D is self-weighted. The operation of dropping by and returning to the lower part of the kneading drum 4 is repeated.

By repeating this movement, the kneading drum 4
The whole of the mud D supplied therein is kneaded.

The auxiliary kneading device 26 installed in the above embodiment functions as follows.

FIG. 7 shows the case where the mud D is kneaded in a porous manner.

In this case, the kneading drum 4 is rotated to the right, and the kneading blade 26c of the auxiliary kneading device 26 is rotated to the left.

When the rotation direction of the kneading blades 26c is opposite to the rotation direction of the kneading drum 4 as described above, the mud D is subjected to partial kneading while being stirred and dispersed at the bottom of the kneading drum 4, and the mud D is The kneading drum 4 is transported toward the outlet end.

Therefore, the mud D thus kneaded is porous.

FIG. 8 shows a case where the mud D is kneaded in a kneaded state.

In this case, the rotation direction of the kneading drum 4 is the same as the above, but the rotation direction of the kneading blade 26c is the right rotation, and the peripheral speed is the peripheral speed of the inner surface of the kneading drum 4. It is a larger version.

When the direction of rotation of the kneading blade 26c is the same as the direction of rotation of the kneading drum 4, the mud D is sandwiched between the kneading blade 26c and the kneading drum 4 at the bottom of the kneading drum 4. The mud D is transferred toward the outlet side end of the kneading drum 4 while undergoing partial kneading.

Therefore, the mud D thus kneaded is kneaded.

Therefore, in the kneading drum 4 of the embodiment described above, the mud D is subjected to the kneading accompanied by the rotation of the kneading drum 4 and the kneading by the kneading blades 26c, so that the mud D is solidified. To be done.

[0053]

As described above, according to the first aspect of the invention, the mud from the mud hopper is supplied to the kneading drum via the screw conveyor, and the solidifying agent is supplied from the solidifying agent supplying nozzle in the kneading drum. Since it is kneaded with the solidifying agent, it can be continuously kneaded with the solidifying agent of mud, and the solidifying operation by the kneading is efficient.

The amount of mud supplied to the kneading drum can be adjusted by adjusting the rotation speed of the screw conveyor, and the rotation speed of the kneading drum and the amount of the solidifying agent supplied from the solidifying agent nozzle can be adjusted. Since it is easy to adjust, good kneading performance can be exhibited.

[Brief description of drawings]

FIG. 1 is an overall schematic view of a solidification device for sludge.

FIG. 2 is a side view showing a driving device of a kneading drum.

3 is a cross-sectional view taken along the line P-P of FIG.

FIG. 4 is a cross-sectional view of a modified example of the outlet side dam portion.

FIG. 5 is an explanatory diagram of a modified example of the screw conveyor.

FIG. 6 is an explanatory diagram of kneading mud by rotating a kneading drum.

FIG. 7 is an explanatory diagram of one mode of kneading mud by an auxiliary kneading device.

FIG. 8 is an explanatory view of another aspect of kneading mud by an auxiliary kneading device.

FIG. 9 is a diagram illustrating the operation of the scraping device.

[Explanation of symbols]

 C rotation center shaft D mud soup 1 solidification device 4 kneading drum 11 hopper 12 screw conveyor 14 solidifying agent supply nozzle 26 auxiliary kneading device 26b rotary shaft 26c kneading blade (spiral blade) 27 scraping device 27b rotary shaft 27c scraping blade (spiral) Wings)

Claims (3)

[Claims] 1. A kneading drum that is driven to rotate around a horizontal center axis of rotation, a mud hopper for storing mud is disposed on one side of the kneading drum, and a solidifying agent supply nozzle is installed in the kneading drum. In addition, a device for solidifying mud, which is provided with a screw conveyor device for supplying the mud from the mud hopper to the kneading drum. 2. The sludge solidification apparatus according to claim 1, wherein the screw conveyor is arranged along a central axis of rotation of the kneading drum, and a spiral shaft is provided below the screw conveyor and parallel to the screw conveyor. A solidification device for mud, which is equipped with an auxiliary kneading device having wings. 3. The mud solidifying device according to claim 1, wherein a scraping device having a spiral blade having a rotary shaft parallel to the screw conveyor is installed above the screw conveyor. Ginger solidification equipment.