JPH0822432B2 - Mud solidification treatment equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to a mud solidification processing apparatus, and more particularly to a mud solidification processing apparatus suitable for solidifying mud having a high water content such as shield excavation mud.

"Prior art" Excavated soil, which is generated in large quantities during civil engineering work including shield construction, is regarded as "sludge" of industrial waste when the water content is high, and its treatment has become a major problem in recent years.

Therefore, various attempts have been made to treat mud by some method so as to reduce the water content and to treat it as ordinary soil. The conventional example will be described below.

(1) Pit method Conventionally, the most widely used method is to carry excavated high-water mud into the pit, mix a lime-based or cement-based solidifying agent, and stir with a stirrer such as a Yumbo to solidify.

(2) Horizontal screw auger method The excavated high water content mud is forcibly conveyed by the horizontal screw auger and is agitated with the solidifying agent. The horizontal screws are of multiple axes (two or four axes) arranged in parallel. There is a device.

(3) Rotating drum method This method is a method in which excavated high-moisture-content mud is caused to flow into a drum, and while being rotated, a solidifying agent is added and the mixture is stirred and mixed.

(4) Low-speed special rotary drum system Currently, it is the most efficient type, and as shown in FIG. 5, the protruding ridges 101, 101, for scratching the inner peripheral surface of the rotary drum 1 are used.
.. are provided in the longitudinal direction of the rotary drum 1 in parallel with the rotation axis, and a flexible elastic cylinder 102 fixed at one point on the upper end of the protrusion 101 is housed in the rotary drum 1. The flexible elastic cylinder 102 hangs down inside the upper portion of the rotary drum 1 as shown in FIG. 5 to prevent the adhesion of mud.

[Problems to be Solved by the Invention] However, each of the above-mentioned conventional methods has the following drawbacks and is not yet completely satisfied.

(1) Pit method This method requires a pit that requires a large occupied area and a heavy machine for stirring / loading. In addition, scattering of the solidifying agent deteriorates the working environment, and further mixing / stirring. However, the biggest drawback is that the solidification treatment takes a long time and continuous treatment cannot be performed.

(2) Horizontal screw auger method This method allows continuous processing, but has a drawback that it requires relatively large power and that the stirring efficiency and the processing capacity are low.

(3) Rotating drum method The rotating drum method enables efficient stirring with relatively small power.
It is known that kneading is possible, but in the case of mud having a high water content, since it has good fluidity, it has the drawback that mud hardly rotates in the drum and is difficult to mix.

Therefore, it is possible to avoid the above drawbacks to some extent by increasing the number of rotations of the drum.On the other hand, if the number of rotations is high, pasty mud that adheres to the inner surface of the drum due to centrifugal force and mixes. This is a drawback that the efficiency is extremely reduced.

Therefore, the above-mentioned mud can be prevented from adhering to the inner surface of the drum to some extent by the conventional example shown in FIG. 5, but this device also has a low rotation speed because it becomes difficult for the flexible elastic cylinder 102 to hang down if the rotation speed is high. As a result, the mud that can be treated with this device is limited to those that do not have too high a water content, or the rotating drum is set to a long length to obtain a predetermined mixing efficiency. It was necessary to do so, and the solidified mud became large lumps, which was not yet satisfactory for efficient and uniform solidification.

"Object" Therefore, the present invention has been made in view of the above, and an object of the present invention is to provide a mud solidification processing device capable of solidifying mud continuously and efficiently with a limited small occupied area.

[Means for Solving the Problem] In order to solve the above-mentioned problems, the structure of the present invention, which has the above-mentioned claims as its gist, is connected to one end side of the mud charging hopper 2 and the other end thereof in order to solve the above problems. Raising blades 4,4,4 ・ inclined in the rotation direction of the rotary drum 1 from the mud charging hopper 2 side toward the soil discharge port 3 on the inner peripheral surface of the rotary drum 1 whose side is the soil discharge port 3. .. is provided, and the mud charging hopper 2 is provided with a feeding port 8 of a second solidifying agent quantitative feeding device 7 for quantitatively feeding a second solidifying agent made of a superabsorbent polymer on the upper part. Then, a screw conveyor 21 that conveys the muddy soil that has been rotated by the second drive source 22 and that has been input to the one end side of the rotating drum 1 is arranged in the lower part, and the shaft 5 inserted in the rotating drum 1 in a substantially horizontal direction is provided. Is a scraping plate 6, whose lower end is inclined toward the soil discharge port 3 side,
6 and 6 are fixed, and further, a feeding port 8'of a second solidifying agent quantitative feeding device 7'for quantitatively feeding the second lime-based second solidifying agent is provided in the rotary drum 1. It is the technical means of doing so.

"Operation" Therefore, the mud solidification treatment apparatus of the present invention is operated by rotating the rotary drum 1 at a relatively high speed. And
The mud fed from the mud feeding hopper 2 and the first solidifying agent fed from the solidifying agent quantitative feeding device 7 are agitated by the screw conveyor 21. This first solidifying agent is not a conventionally known lime-based solidifying agent described later, but is made of a superabsorbent polymer, and this first solidifying agent absorbs water in the mud in a relatively short time and pastes the mud. Exhibits the action of forming.

Therefore, although the solidification of the mud proceeds from the second portion of the mud feeding hopper, the screw conveyor 21 exhibits the agitation action and the action of reliably feeding the mud that has been solidified to some extent to the rotary drum 1 side. .

Then, the mud sent to the rotary drum 1 is mixed with the second solidifying agent, and as the rotary drum 1 rotates, the scraping blades 4, 4, 4
It can be scraped up with ... When solidification proceeds to some extent during this scraping, the mud becomes a paste and tends to adhere to the inner peripheral surface of the rotating drum 1. However, each scraping blade 4 moves from the mud charging hopper 2 side toward the soil discharging port 3 to the rotary drum 1
Because it tilts in the direction of rotation of the mud, when it rotates at a high speed and a large centrifugal force is applied, the mud is fed along the scraping blades 4 along the scraping blade 4
It exerts a force to return to the side to prevent adhesion.

Then, in response to the action of returning the mud of the scraping blade 4 to the mud feeding hopper 2 side, the scraping plate 6 (this scraping plate merely guides the falling mud and scrapes the mud from the inner surface of the rotary drum 1). It is not something to take, but in general
Since this type of guide plate is also referred to as a "scraping plate", the present application also follows the conventional convention. ) Has the effect of advancing the mud that falls after being scraped up to the soil discharge port 3 side, and due to the difference between these two effects (actually, the inclination angle of the rotary drum 1 also acts), In addition to the first solidifying agent, the second solidifying agent is mixed and agitated to gradually solidify, then progresses in the rotary drum 1, and is discharged from the soil discharging port 3 in a solidified state.

In the above, a lime-based solidifying agent is conventionally used as the second solidifying agent, and it is needless to say that the mud solidifies by reacting with water, but the characteristic here is that the first solidifying agent is already mixed. Therefore, the second solidifying agent does not react locally with a large amount of water, but gradually reacts with the water physically entrapped by the first solidifying agent (a polazone reaction). That is, the second solidifying agent is effectively used, and the solidified mud becomes granular without forming a large lump (details will be described later).

[Example] Next, an example of the present invention will be described in detail with reference to the accompanying drawings.

In the figure, reference numeral 1 denotes a rotary drum having a mud feeding hopper 2 connected to one end side thereof and a soil discharge port 3 at the other end side thereof.

In the rotary drum 1, a rail ring 11 is fitted in a proper place on the outer periphery, rotatably supported by support rollers 12, 12, 12, ... And rotated by a drive source 13. In the illustrated example, the sprocket ring 14 is fixed to the muddy charging hopper 2 side of the rotary drum 1, and a chain loop 16 is hung between the sprocket ring 14 and the drive source 13 in the illustrated example. In addition, this rotary drum 1 is provided with bearing rollers 12,1
It is the same as the conventional one because it is supported so that the soil discharge port 3 side becomes slightly lower by 2, 12, ... (Generally, it is said that this inclination angle is 3 to 5 degrees most convenient.) However, in the case of the present invention, it is not always necessary to lower the soil discharge port 3 side.

Further, on the inner peripheral surface of the rotary drum 1, there are provided scraping blades 4, 4, 4, ... Which are inclined in the rotation direction of the rotary drum 1 from the mud charging hopper 2 side toward the soil discharge port 3. There is. Normally, the raking blades arranged on the inner peripheral surface of the rotary drum 1 are erected in a radial direction in parallel with the rotation axis of the rotary drum 1, but from the mud introduction hopper 2 side of the present application toward the soil discharge port 3. The inclination in the rotating direction of the rotary drum 1 means that the rotary drum 1 is arranged so as to be inclined like a screw as shown most clearly in FIG. It is needless to say that the raking blades 4, 4, 4, ... Are provided in an appropriate number, and in the illustrated embodiment, the raking blades 4 are provided at positions of the inner circumference 4 of the rotary drum 1, respectively. Raised wings 4
The spiral drum may be continuous in the longitudinal direction of the rotary drum 1, but it is desirable to divide the spiral drum 1 in the middle in order to prevent adhesion of mud.
A plurality of sets are also juxtaposed in the longitudinal direction of the above, and since the material on the side of the mud input hopper 2 has a large fluidity, the height of the mud input hopper 2 is set high so that the mud can be reliably scraped up.

In addition, a feeding port 8 of a first solidifying agent quantitative feeding device 7 for quantitatively feeding a first solidifying agent made of a superabsorbent polymer is provided in the upper part of the mud charging hopper 2 and the first lowering agent is supplied to the lower part of the mud feeding hopper 2. Two drive source 22
A screw conveyor 21 that conveys the mud that is rotated and charged into one end of the rotary drum 1 is provided.

The first solidifying agent quantitative feeding device 7 has a tank 31 fixed to a machine base, and the first solidifying agent in the tank 31 is a screw conveyor 9 driven by a screw driving source 32. A fixed amount is carried out to the delivery port 8 which is opened at.

The reason why the screw conveyor 21 is provided is that the first solidifying agent made of highly water-absorbing polymer (including water-soluble polymer) is first mixed into the mud to perform solidification to some extent (actually, this solidification is performed). Is fed to the rotating drum 1 side before the mud having progressed to become pasty) and solidification progresses immediately after charging the mud into the hopper 2. And the reliable transport of mud that solidification has signaled to some extent.

Further, scraping plates 6, 6, 6, ... Inclining the lower end side toward the soil discharge port 3 side are fixed to the shaft 5 inserted in the rotary drum 1 in a substantially horizontal direction. The shaft 5 is
Although not necessarily specified in the drawings, both ends are fixed to appropriate fixing members such as a machine base and inserted and fixed in the rotary drum 1. The shaft 5 also serves as a support material for a second solidifying agent conveyor 9'described later. However, when the second solidifying agent conveyor 9'can be firmly fixed by itself, the second solidifying agent conveyor 9 ' The 9'cylinder may also be used for this shaft 5, in which case the shaft 5 may of course be omitted. Then, the inclination angle of the scraping plate 6 is set to the scraping blade 4
The relative relationship between the inclination angle of the rotary drum 1 and the normal operation rotational speed of the rotary drum 1 is set so that the mud is slowly transported inside the rotary drum 1 to the soil discharge port 3 side. In addition, in the illustrated embodiment, stirring plates 6a, 6a are also provided on the side of the shaft 5 on which the muddy soil is fed. This stirring plate 6a is provided not for guiding the falling mud to the soil discharge port 3 side, but for mainly dividing the mass of the falling mud, and as shown in FIG. However, the stirring plate 6a may of course be omitted, although it is arranged at a predetermined angle (including orthogonality) when viewed from the plane.

Further, a delivery port 8'of a second solidifying agent quantitative feeding device 7'for quantitatively feeding the second lime-based second solidifying agent is provided inside the rotary drum 1.

The second solidifying agent quantitative feeding device 7 ′ may have the same structure as the first solidifying agent quantitative feeding device 7. The screw conveyor 9'of the second solidifying agent quantitative feeding device 7'is inserted into the rotary drum 1 from the soil discharge port 3 side,
The second solidifying agent is quantitatively fed to an appropriate position in the rotary drum 1.

That is, the present invention has the first solidifying agent quantitative feeding device 7 and the second solidifying agent quantitative feeding device 7 ′, so that different solidifying agents can be fed from both. The reason for using the different first solidifying agent and the second solidifying agent is as follows.
When the first solidifying agent consisting of super absorbent polymer is mixed in the mud with a high water content, this first solidifying agent absorbs 400 to 2000 times the volume of water from the mud in a relatively short time to form the mud. Make paste. This pasty phenomenon is because the first solidifying agent collects the soil particles, and further, because the first solidifying agent neutralizes the surface potential of the soil particles and collects the soil particles. is there. Then, when the second solidifying agent of lime type is mixed after the mud starts to change into a pasty state, the second solidifying agent does not react locally with a large amount of water, but is physically reacted by the first solidifying agent. Gradually reacts with the water that is embraced (pozzolan reaction)
Therefore, by appropriately selecting the feeding place of the second solidifying agent main agent, it becomes possible to fix water uniformly, the amount of the second solidifying agent added is made efficient, and the solidified mud is This is because it is possible to form a dry granular shape without forming a large lump (in addition to a gradual change in viscosity, efficient stirring, division due to collision with the scraping plate 6, etc.).

[Advantages of the Invention] The present invention as described above can provide a mud solidification treatment apparatus capable of performing continuous treatment with a small operating power by using the rotary drum 1.

Since the present invention is provided with the first solidifying agent quantitative feeding device 7 and the second solidifying agent quantitative feeding device 7 ', different types of solidifying agents can be used, and the first solidifying agent quantitative feeding device 7 can be used. A second solidifying agent quantitative feeding device 7 ′ for the first solidifying agent made of a super absorbent polymer.
By feeding the second lime-based solidifying agent, it is possible to provide a mud solidification treatment device that can efficiently use the solidifying agent.

In addition, the present invention is directed to the soil discharge hopper 2 side to the soil discharge port 3
Raising blade 4, which inclines toward the direction of rotation of the rotary drum 1,
Since 4,4 ... are used, the mud does not adhere to the rotating drum 1 even when the operation is performed by high speed rotation. Since it is obtained by the difference in the mounting angle between the scraping plate 6 and the scraping plate 6, sufficient stirring efficiency can be obtained even if the device is downsized, the solidified product can be solidified into a powder that can be easily processed later, and the shield excavation method etc. It is possible to provide a mud solidification treatment device that can be used even in a narrow place such as underground.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the mud solidification treatment device of the present invention, FIG. 2 is a cross-sectional view taken along the line AA, FIG. 3 is a perspective view of a rotary drum, and FIG. 4 is a scraped plate portion. A front view and FIG. 5 are sectional views of a conventional example. 1-rotating drum, 2-mud loading hopper, 3-earth dumping port,
4 to scratching blade, 5 to shaft, 6 to scraping plate, 7 to 1st solidifying agent quantitative feeding device, 7'to 2nd solidifying agent quantitative feeding device, 8 to
Delivery port, 8'-delivery port

 ─────────────────────────────────────────────────── ───Continued from the front page (56) References JP-A-1-139198 (JP, A) Actual development 2-40488 (JP, U) JP-B 46-20425 (JP, B1) JP-B 2- 30750 (JP, B2)

Claims (1)

[Claims] 1. A mud charging hopper 2 is connected to one end side, and the other end side is an earth discharging port 3 on the inner peripheral surface of a rotary drum 1 from the mud charging hopper 2 side toward the earth discharging port 3. Rotating drum 1
, Which are slanted in the rotation direction, are arranged, and the first solidifying agent made of a superabsorbent polymer is quantitatively fed to the upper part of the mud charging hopper 2. The screw inlet 21 of the solidifying agent quantitative feeding device 7 is inserted, and the screw conveyor 21 that conveys the mud that is rotated by the second drive source 22 and is fed to the one end side of the rotary drum 1 is disposed in the lower portion, Shaft 5 inserted in the rotating drum 1 in a substantially horizontal direction
The scraping plates 6, 6, whose bottom end is inclined toward the soil discharge port 3 side,
6 is fixed, and further, in the rotary drum 1, a feeding port 8'of a second solidifying agent quantitative feeding device 7'for quantitatively feeding the lime second solidifying agent.
A mud solidification treatment device that is installed.