JPH04176380A - Solidifying and treating equipment for mud - Google Patents

Abstract

PURPOSE:To diminish motive power for operation and to enable continuous treatment by providing a scraping-up blade on the inner circumferential face of a rotary drum equipped with an introduction port and a discharge port of mud and providing a scraping-down plate to a shaft which is inserted into the rotary drum in the horizontal direction and also providing the supply port of a solidifying agent to the introduction port of mud. CONSTITUTION:When a rotary drum 1 is operated at comparatively high velocity, mud introduced from an introduction port 2 is mixed with a solidifying agent supplied by a quantitative feeder 7 thereof. The mixture is scraped up by scraping-up blades 4, 4.... When solidification is advanced at several degrees, mud is made pasty and shows a tendency to be stuck on the inner circumferential face of the rotary drum 1. However since the respective scraping-up blades 4 are tilted in the direction of rotation of the rotary drum 1 toward a discharge port 3 from the introduction port 2 side, force for returning mud to the introduction port 2 side along the respective scraping-up blades 4 is added when centrifugal force is exerted. Action to avoid sticking is performed for mud. The respective scraping-down plates 6 perform action to advance mud which falls after being scraped up to the discharge port 3 side. The solidifying agent is mixed with mud by difference of both actions and the mixture is agitated. Mud is slowly solidified and advanced through the rotary drum 1 and discharged in a solidified state from the discharge port 3.

Description

DETAILED DESCRIPTION OF THE INVENTION INDUSTRIAL APPLICATION J Field of the Invention The present invention relates to a mud solidification treatment device, and particularly to a mud solidification treatment device suitable for solidifying mud with a high water content such as shield drilling mud.

``Conventional technology j'' Excavated soil generated in large quantities during civil engineering work, including shield construction, has a high water content and is considered to be industrial waste ``sludge'', so its disposal has recently become a major problem.

Therefore, various attempts have been made to treat the mud by some method to reduce its water content so that it can be handled as normal mud.

(1) Bit method This is the most widely used conventional method. Excavated high water content mud is carried into a bit, mixed with a lime-based or cement-based solidifying agent, and stirred with a stirrer such as a Yumbo to solidify it.

(2) Horizontal screw auger One-way excavated high water content mud is forcibly conveyed using a horizontal screw auger and mixed with a solidifying agent. Multiple shafts (two-shaft, four-shaft) with multiple horizontal screws arranged in parallel. There is a device.

(3) In the rotating drum method, the excavated high water content mud is poured into a drum, and while it is being rotated, a solidifying agent is added and mixed by stirring.

(4) Low-speed special rotating drum system This is currently considered the most efficient method, as shown in Figure 5.
Raising protrusions 101 and 10 are provided on the inner peripheral surface of the rotating drum 1.
1, 101, . Cylinder 1
02, and this flexible elastic cylinder 102 hangs down in the upper part of the rotating 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 conventional systems has the following drawbacks, and is not yet completely satisfied.

(1) Bit method This method requires a bit that occupies a large area and heavy equipment for stirring and loading, and also causes the scattering of solidifying agent, which worsens the working environment. However, the biggest drawback is that the solidification process takes a long time and cannot be processed continuously.

(2) One-way horizontal screw auger This method allows for continuous processing, but it requires a relatively large amount of power and has the disadvantage that it may not be possible to process if gravel is mixed into the mud. However, it also has the disadvantage of low stirring efficiency and low processing capacity.

(3) Rotating drum system The rotating drum system is known to be capable of efficient agitation and cross-mixing with a relatively small amount of power. It has the disadvantage that it is difficult to rotate and mix.

To avoid the above disadvantages, it is possible to some extent to increase the rotation speed of the drum, but on the other hand, if the rotation speed is high, the mud that has become paste-like during solidification will adhere to the inner surface of the drum due to centrifugal force, which will reduce the mixing efficiency. The disadvantage is that the

At the bottom, adhesion of the mud to the inner surface of the drum can be prevented to some extent by the conventional example shown in FIG. As a result, the equipment can only process mud with a moisture content that is not too high, or the rotating drum can be set to a long length to achieve a given mixing efficiency. Moreover, the solidified mud becomes large clumps, and efficient and uniform solidification is not yet satisfactory.

Purpose J The present invention was made in view of the above, and an object of the present invention is to provide a mud solidification treatment device that can solidify mud continuously and efficiently in a limited and narrow occupied area.

"Means for Solving the Problems" In line with the above-mentioned object, the structure of the present invention, which is summarized in the claims described above, has a mud inlet 2 at one end and a mud discharge port 2 at the other end. Raking blades 4, 4, 4, . Scraping plates 6, 6, 6, . A technical measure is taken in which a feeding port 8 of a solidifying agent quantitative feeding device 7 is inserted into the mud input port 2 and the rotating drum 1.

"Operation" Therefore, the mud solidification treatment apparatus of the present invention is operated by rotating the rotary drum 1 at a relatively high speed. Then, mud input port 2
The solidifying agent is mixed into the mud introduced by the solidifying agent quantitatively feeding device 7, and as the rotating drum rotates once, the raking blades 4, 4
．． It is scraped up with 4... When solidification progresses to a certain extent during this raking, the mud tends to become glue-like and adhere to the inner circumferential surface of the rotating drum l. However, since each raking blade 4 is inclined in the rotational direction of the rotary drum 1 from the mud input port 2 side toward the soil removal 03, when it rotates at high speed and a large centrifugal force is applied, the mud will move along the raking R4. Mud input port 2 III
A force is applied to return the material to the surface, which acts to prevent adhesion.

In response to the action of the scraping blades 4 returning the mud to the mud input port 2 side, a scraping plate 6 (this scraping plate simply guides the falling dirt and removes the mud from the inner surface of the rotating drum 1) Although it does not scrape, this kind of guide plate is generally also called a "scraping plate" for the scraping blade, so the conventional practice was followed in this application as well.) falls after being scraped up. It acts to advance the mud to the discharged soil 03 side, and due to the difference between these two actions (actually, the inclination angle of the rotating drum l also acts), the solidifying agent is mixed and stirred into the mud, and it is gradually solidified. The soil advances through the rotating drum 1 and is eventually discharged from the discharged soil 03 in a solidified state.

Embodiment 1 Next, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

In the figure, reference numeral 1 denotes a rotating drum having a mud input port 2 at one end and a mud discharge port 3 at the other end.

The rotating drum 1 has a rail ring 11 fitted at a suitable position on its outer periphery, is rotatably supported by support rollers 12, 12, 12, and so on, and is rotated by a drive source 13. It is the same as the conventional one, and in the illustrated example, the rotating drum l
Fix the sprocket ring 14 to the mud input port 2 side,
A chain loop 16 is connected to the sprocket ring 14 and the drive source 13. Furthermore, the rotary drum 1 is arranged so that the soil discharge port 3 side is slightly lowered by the support rollers 12, 12, 12, etc. (generally, it is said that the most convenient inclination angle is 3 to 5 degrees. ) The support is the same as in the conventional case, but in the case of the present invention, it is not necessarily necessary to lower the soil discharge port 3 side.

The mud input port 2 and the soil discharge 03 may be the same as conventional ones, but in this embodiment, a screw conveyor 21 is provided on the mud input port 2 side. That is, a screw conveyor 21 rotated by a second drive source 22 is disposed below the mud inlet 2, and the mud is fed into the mud inlet 2 (actually, in order to handle highly water-containing mud, an appropriate conveying means is used). The mud is continuously fed into this screw conveyor 21.
It is carried into the rotating drum 1 by the following.

The reason why the screw conveyor 21 is provided is that in this embodiment, a base agent consisting of a highly water-absorbing polymer (including a water-soluble polymer) is first mixed into the mud, and before it is assimilated to a certain extent and becomes paste-like, lime is mixed into the mud. This is because we did not want to mix in any auxiliary agents.
This is to ensure that the mud and the base agent are supplied in a fixed amount to the mud input port 2 so that the solidification progresses immediately after the mud is introduced. There is.

Scraping blades 4, 4, 4, . It is. Normally, the raking blades arranged on the inner circumferential surface of the rotary drum 1 are erected in the radial direction parallel to the rotation axis of the rotary drum l, but in the present invention, from the mud input port 2 side toward the soil discharge port 3. The raking blades 4, 4. It is a matter of theory to provide an appropriate number of raking blades 4, and in the illustrated embodiment, raking blades 4 are provided at four divisions of the inner periphery of the rotating drum 1. Although it may be formed into a continuous spiral shape, it is preferable to divide it in the middle in order to prevent the adhesion of mud, and in the illustrated example, multiple sets are arranged side by side in the longitudinal direction of the rotating drum 1. Moreover, since the material on the side of the mud input port 2 has high fluidity, its height is set high to ensure reliable raking of the mud.

Scraping plates 6, 6, 6, . . . whose lower end side is inclined toward the soil removal 03 side are fixed to the shaft 5 inserted into the rotating drum 1 in a substantially horizontal direction. The shaft 5 is inserted and fixed into the rotating drum 1 with both ends fixed to an appropriate fixing member such as a machine base, and in the illustrated example, the shaft 5 is The shaft 5 also serves as a support for the auxiliary conveyor 9', which will be described later, but if the auxiliary conveyor 9' can be firmly fixed by itself, the 9° cylinder of the auxiliary conveyor can also be used as this shaft 5. In this case, the shaft 5 may be omitted, and the scraping plate 6 may be omitted.
The inclination angle is determined by the relative relationship between the inclination angle of the raking blade 4 and the rotary drum 1, and the normal operating rotation speed of the rotary drum 1, so that the mud slowly advances inside the rotary drum 1 toward the soil discharge port 3. It is set to increase. In the illustrated embodiment, stirring plates 6a, 6 are provided on the mud input port 2 side of the shaft 5.
A is provided. This stirring plate 6a is provided not only to guide the falling mud to the soil discharge port 3 side (but also to break up lumps of mud that fall and collide with each other), and is provided along the axis of the shaft 5 as shown in Fig. 4. Although the stirring plate 6 is arranged at a predetermined angle (including orthogonal) to the direction when viewed from the plane, thermally speaking, this stirring plate 6
a may be omitted.

Further, a feeding port 8 of a solidifying agent quantitative feeding device 7 is inserted into the mud inlet 2 and the rotating drum 1.

This solidifying agent quantitative feeding device 7 has a tank 31 fixed to the machine base, and the individualizing agent in this tank 31 is transferred to a screw driving source 32.
A screw conveyor 9 driven by a screw conveyor 9 carries out a fixed amount of mud to a feeding port 8 opened at the top of the mud inlet 2. In this embodiment, as mentioned above, since the main material and the auxiliary agent are used as the thinning agent, an auxiliary solidifying agent quantitative feeding device 7° is provided, and this auxiliary solidifying agent quantitative feeding device 7° is provided. The device 7" fixes a tank 31° on a stand, and this tank 31
A screw conveyor driven by a screw drive source 32° moves a screw conveyor 9° in a fixed amount to a feeding port 8, and this screw conveyor 9 is connected to a rotary drum 1 from the earth removal 03 side. The auxiliary agent is inserted into the rotary drum 1 to supply a fixed amount of the auxiliary agent to an appropriate position within the rotary drum 1.

In this example, the reason why the main agent and the auxiliary agent were used is that, first, when the main agent made of a highly water-absorbing polymer is mixed into mud with a high moisture content, it absorbs 400 to 200 times its volume of water. The main agent absorbs water in the mud in a relatively short period of time and turns the mud into a paste-like consistency. This glue-like phenomenon is due to the base agent collecting soil particles, but also because the base agent neutralizes the surface potential of the soil particles and aggregates the soil particles. Then, when the auxiliary agent is mixed in after the mud begins to change into a pasty state, the auxiliary agent does not react with the locally abundant water;
It gradually reacts (pozzolanic reaction) with the water physically entrained by the base agent, and by appropriately selecting the locations where the base agent and auxiliary agent are delivered, uniform moisture fixation is possible, and the thinning agent The input amount can be made efficient, and the fined mud can be made into dry granules without forming large clumps (in addition to viscosity changes, efficient stirring and collision with the scraping plate 6) However, if the water content is relatively low, a satisfactory atomization effect can be obtained even if supply of the base agent is stopped; It was more effective to feed the liquid using the feeding device 7.

"Effects of the Invention" The present invention is as described above, and by using the rotating drum 1, it is possible to provide a mud solidification treatment apparatus that requires less operating power and is capable of continuous treatment.

Further, the present invention provides raking blades 4, 4.4 which are inclined in the rotational direction of the rotary drum 1 from the mud input port 2 side toward the soil removal 03.
... is used, mud does not adhere to the rotating drum 1 even when operating at high speed, and furthermore,
The speed at which the mud travels through the rotating drum 1 is mainly determined by the angle difference between the scraping blades 4 and the scraping plates 6, so even if the device is downsized, sufficient stirring efficiency can be obtained and shield excavation is possible. It is possible to provide a mud assimilation treatment device that can be used even in narrow places such as underground in construction methods.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing one embodiment of the mud solidification treatment device of the present invention, Fig. 2 is a sectional view taken along line A-A'uA, Fig. 3 is a perspective view of a rotating drum portion, and Fig. 4 is a section of a scraping plate section. A partial front view, and FIG. 5 is a sectional view of a conventional example. 1 ~ Rotating drum 2 ~ Mud input port 3 ~ Soil removal 0
4 ~ Scraping blade 5 ~ Shaft 6 ~ Scraping plate 7
~Solidifying agent constant 1 Feeding device 8~Feeding port

Claims (1)

[Scope of Claims] The rotary drum 1 has a mud input port 2 on one end and a soil discharge port 3 on the other end. Scraping blades 4, 4 inclined in the rotation direction of 1
, 4... are arranged, and the shaft 5 inserted into the rotating drum 1 in a substantially horizontal direction has scraping plates 6, 6, 6... whose lower end side is inclined toward the soil discharge port 3 side. Further, a feeding port 8 of a solidifying agent quantitative feeding device 7 is inserted into the mud input port 2 or into the rotating drum 1.