JP7126401B2 - slime processing system - Google Patents

Description

TECHNICAL FIELD The present invention relates to a slime treatment system, and more particularly, to a slime treatment system for treating slime-mixed water in a borehole excavated for constructing on-site construction piles, continuous underground walls, and the like.

Usually, a vertical hole is excavated in order to construct on-site piles or continuous underground walls. is required. Slime-mixed water is a mixture of slime such as collapsed soil in the borehole and earth and sand in muddy water and water used during excavation and a stabilizer. Later, when a load is applied, it causes the pile to settle, the strength of the concrete to decrease, and the bearing capacity of the pile to decrease.

This slime treatment includes a primary slime treatment performed immediately after excavation is completed and a secondary slime treatment performed before concrete is poured. It is desirable to remove most of the slime in the primary slime treatment.

For this primary slime treatment, there are usually methods such as removing the slime that settles to the bottom of the borehole after a period of time using a rough bottom bucket, or dropping the slime bucket to the bottom of the borehole immediately after excavation to catch the slime that settles. used. However, the method using these buckets has problems that it takes time to remove slime and the slime removal rate is low.

As a method of solving such problems, a method of removing slime using a sand pump for treating slime has been proposed (see Patent Document 1). This method is excellent in that the slime-mixed water can be discharged efficiently by using a sand pump equipped with a special removal mechanism.

Japanese Patent No. 3323988

However, the slime-mixed water discharged using the sand pump for treating slime of Patent Document 1 is treated as waste as it is because the rate of removal of slime per hour is high and separation is difficult due to its efficient collection performance. There was a problem that it was necessary to do so and it was very costly. Moreover, when processing a large-diameter borehole, there is also a problem that it is difficult to remove the slime from the bottom side wall portion of the borehole.

The present invention has been made in view of the circumstances as described above, and is capable of reliably and efficiently collecting slime-mixed water in a borehole, efficiently separating the collected slime-mixed water in a short period of time, and further comprising: An object of the present invention is to provide a slime treatment system capable of separating and regenerating into a reusable good liquid.

That is, the slime processing system of the present invention is characterized by the following.

First, a slime treatment system for treating slime-mixed water in a borehole using a sand pump for slime treatment and a slime separation tank, wherein the slime separation tank includes a first separation tank, a second separation tank and a storage tank. In the upper part of the first separation tank, a vibrating sieve for removing gravel and dust from the slime-mixed water collected by the sand pump for slime treatment, and a pump from the bottom of the first separation tank to remove the slime and a first slime separation device for separating the first treated water, and a first outlet for discharging the slime that has settled on the bottom of the first separation tank, wherein the second separation tank is equipped with the first treated water is introduced and pulled up from the bottom by a pump to separate slime and second treated water, and a second discharge port for discharging the slime that has settled at the bottom of the second separation tank, The slime treatment system is characterized in that the storage tank comprises a treated water tank for introducing and storing the second treated water, and a pump for supplying the second treated water to the outside.

Secondly, in the slime treatment system of the first invention, the sand pump for treating slime is arranged in the center of the sand pump, a cylindrical upper water flow direction restricting plate, and the upper water flow direction restricting plate, Further, a screw fixed to the lower end of the driving rotary shaft of the sand pump, an upper mounting disc provided on the upper portion of the upper water flow direction restricting plate, and a conical shape disposed below the screw It is preferable to comprise a lower water flow direction guide plate and a connecting member that connects the upper mounting disc and the lower water flow direction guide plate.

Thirdly, in the slime processing system of the second invention, it is preferable that the angle of the stirring blades of the screw is in the range of 10 to 18° with respect to the horizontal plane of the upper mounting disc.

Fourthly, in the slime processing system of the first to third inventions, it is preferable that a plurality of the first slime separating devices and the second slime separating devices are provided.

Fifth, in the slime treatment system of the first to fourth inventions, in the good liquid replacement step of recovering the slime-mixed water in the borehole by the sand pump for slime treatment and replacing it with the good liquid, It is preferable to perform replacement while supplying treated water as a good liquid.

Sixthly, in the slime treatment system of the fifth aspect of the invention, in the good liquid replacement step of recovering the slime mixed water in the borehole by the slime treatment sand pump and replacing it with the good liquid, the slime treatment sand pump It is preferable that the slime-mixed water is recovered while rotating along the bottom side wall of the excavation hole.

Seventh, in the good liquid replacement step of the slime treatment system of the fifth or sixth invention, a bottom-landing member that settles near the center of the bottom of the excavation hole, and a a pipe mounted in parallel, a float member provided on top of the pipe, an intermediate arm extending from the float member toward the side wall, and a bottom arm provided on the bottom-mounted member and extending toward the bottom side wall. , a central axis wire which is inserted through the pipe and has a central weight connected to its tip for sinking to the bottom of the excavation hole; A side wall wire connected to a side wall weight for sinking to the bottom of the borehole is provided, and the side wall weight is moved along the bottom side wall in a state in which the center weight and the side wall weight are settled to the bottom of the borehole, thereby reducing the center axis It is preferable to check the removal state of slime on the side wall of the bottom of the excavation hole using a slime removal checking device that can check the remaining state of slime based on the length difference between the wire and the side wall wire.

INDUSTRIAL APPLICABILITY According to the slime treatment system of the present invention, the slime-mixed water in the borehole can be reliably and efficiently recovered, the recovered slime-mixed water can be efficiently separated in a short time, and the slime can be separated into good reusable liquid. Playback becomes possible.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic explanatory drawing which shows one Embodiment of the slime processing system of this invention. 1 is a schematic diagram showing one embodiment of a sand pump for processing slime; FIG. It is the schematic which shows the angle of the stirring blade of a screw. BRIEF DESCRIPTION OF THE DRAWINGS It is the schematic which shows one Embodiment of the slime removal confirmation apparatus used for the slime processing system of this invention. It is a photograph showing the state of residual slime after treatment in Examples, (A) shows the state after treatment in Example 4, and (B) shows the state after treatment in Comparative Example 2. 10 is a photograph showing the sand content measured for each hour in Example 5. FIG.

The slime processing system of the present invention will be described in detail below based on the drawings. FIG. 1 is a schematic explanatory diagram showing one embodiment of the slime processing system of the present invention, and FIG. 2 is a schematic diagram showing one embodiment of a sand pump for slime processing.

The slime treatment system of this embodiment is a slime treatment system that treats slime mixed water in a borehole 4 using a slime treatment sand pump 1 and a slime separation tank 2 .

In addition, the meaning of the slime used in the present invention includes stabilizing liquid materials mixed in water and stabilizing liquid introduced during excavation, sand, mud, gravel, wood chips, and other garbage mixed in water and stabilizing liquid during excavation. It means the one including contaminants such as.

The slime processing sand pump 1 used in the slime processing system of the present embodiment includes a sand pump 10, a cylindrical upper water flow direction restricting plate 13, and a sand pump disposed in the center of the upper water flow direction restricting plate 13. 10, a screw 12 fixed to the lower end of a drive rotary shaft 120, an upper mounting disk 14 provided on the upper part of the upper water flow direction restricting plate 13, and a conical lower part provided on the lower part of the screw 12. It is composed of a water flow direction guide plate 15 and a connecting member 16 that connects the upper mounting disc 14 and the lower water flow direction guide plate 15 .

Specifically, for example, as shown in FIG. 2, a sand pump 10 and a slime processor 11 are connected by bolts. A driving rotary shaft 120 of the sand pump 10 extends downward, and the screw 12 of the slime processing machine 11 is fixed to its lower end. A discharge pipe 18 is connected to the upper portion of the sand pump 10, and a wire 19 for supplying electricity for driving the sand pump 10 is also connected.

The slime processing machine 11 connected to the lower part of the sand pump 10 has a cylindrical upper water flow direction restricting plate 13, a screw 12 arranged in the center of the upper water flow direction restricting plate 13, and a drive of the sand pump 10 in the center. An upper mounting disk 14 having a through hole 14A through which a rotating shaft 120 is inserted, and a hollow conical lower water flow direction guide plate 15 having a concave curved surface 15A disposed below the screw 12. there is

The screw 12 is fixed to the lower end of the driving rotary shaft 120 of the sand pump 10, and the upper end of the upper water flow direction restricting plate 13 is spaced from the lower end of the sand pump 10 to the extent that the slime mixed water can be sucked. The upper mounting disk 14 is fixed in place.

The upper mounting disk 14 and the lower water flow direction guide plate 15 are integrally connected by a plurality of suspension bolts 16 as connecting members, and a water flow direction guide vertical plate 17 is formed below each suspension bolt 16. ing. Furthermore, the top of the lower water flow direction guide plate 15 and the concave curved surface 15A are provided with a plurality of water flow discharge holes 15B, and the upper water flow direction restriction plate 13 is provided with a plurality of water flow suction holes 13A. there is

A wire is connected to the upper part of the discharge pipe 18, the sand pump 11 for slime processing of the said structure is suspended from a crane via a wire, and it is lowered to near the bottom part of the excavation hole 4, and is used.

Normally, the excavated hole 21 for primary slime treatment is built with a casing along with excavation, and the slime mixed water is stored therein. In addition, particularly in this state, the bottom of the excavation hole 4 is in a state where slime has settled.

When the sand pump 1 for slime treatment is lowered to the vicinity of the bottom of the excavated hole 21 while sending a wire to the vicinity of the bottom of the excavated hole 21 in such a state, the sand pump 10 is started and the slime disposer 11 is operated. The screw 12 rotates, and the slime mixed water around the screw 12 is distributed along the concave surface 15A of the lower water flow direction guide plate 15 in a horizontal radial direction and through several water flow discharge holes 15B of the lower water flow direction guide plate 15. and vertically downward. As a result, the slime 22 deposited near the bottom of the excavated hole 21 is agitated and floated. Then, the slime mixed water is sucked into the sand pump 10 from between the lower end portion of the sand pump 10 and the upper mounting disk 14 , rises through the discharge pipe 18 , and is discharged out of the excavation hole 4 . According to the slime processing sand pump 1 of this embodiment having the above mechanism, the slime-mixed water can be efficiently discharged out of the excavation hole 4 in a short period of time.

Here, the angle θ of the stirring blades of the screw 12 used in the slime processing sand pump 1 of the present embodiment is, as shown in FIG. is preferable. By setting the angle θ of the stirring blade of the screw 12 within the above range, it is possible to generate an efficient water flow, and the slime-mixed water around the screw 12 is efficiently pumped in the horizontal radial direction and the vertical downward direction. becomes possible. From this point of view, the angle θ of the stirring blades of the screw 12 is more preferably in the range of 12 to 15°, more preferably 13°.

In addition, in the excavation hole 21, especially when an enlarged bottom portion is formed in which the diameter of the bottom portion is one step larger than the opening diameter of the ground portion of the excavated hole 4, it is difficult to remove the slime deposited near the side wall of the enlarged bottom portion. There are cases. Therefore, in the excavated hole 4 having a widened bottom, it is preferable to remove the slime while turning the sand pump 1 along the side wall of the bottom. This makes it possible to reliably remove the slime deposited near the side wall of the enlarged bottom portion.

Further, in the slime processing system of the present embodiment, it is preferable to use the slime removal checking device 3 to check the state of residual slime on the bottom side wall of the excavation hole 4 in the step of removing slime from the bottom side wall.

As the slime removal confirmation device 3 for confirming the residual state of slime, for example, as shown in FIG. A pipe 32 attached in parallel to the excavation hole 4, a float member 33 provided on the upper part of the pipe 32, an intermediate arm 35 extending from the float member 33 toward the side wall, and provided on the bottom landing member 31, A bottom arm 34 extending toward the bottom side wall, a central shaft wire 37 inserted through the pipe 32 and having a center weight 36 connected to its tip for sinking to the bottom of the excavation hole 4, an intermediate arm 35 and a tip of the bottom arm 34. The slime removal confirming device 3 can be exemplified by a side wall wire 39 which is inserted through a provided insertion hole and has a side wall weight 38 connected to its tip end for sinking to the bottom side wall.

The method of using the slime removal confirmation device 3 is as follows. First, the bottom-landing member 31 is lowered near the center of the bottom of the excavation hole 4, and the center shaft wire 37 is installed through the pipe 32 so that the center weight 36 is grounded. At this stage, the float member 33 causes the pipe 32 to stand at the central portion of the borehole 4 . At the same time, a side wall wire 39 is installed through the insertion holes of the intermediate arm 35 and the bottom arm 34 so that the side wall weight 38 is positioned on the bottom side wall. That is, the length of the intermediate arm 35 is set to the length of the radius of the top of the borehole 4 , and the length of the bottom arm 34 is set to the length of the radius of the bottom of the borehole 4 . The bottom arm 34 is bendably attached to the bottom-landing member 31 so that it can be folded parallel to the pipe 32 as indicated by the dotted line in FIG.

Here, before the slime removal confirming device 3 is introduced, the lengths of the central shaft wire 37 and the side wall wire 39 are recorded by marks or the like in advance when the positions of the center weight 36 and the side wall weight 38 are horizontally aligned.

Then, with the center weight 36 and the side wall weight 38 sinking to the bottom of the excavation hole 4, the side wall wire 39 is moved along the side wall on the ground, the intermediate arm 35 and the bottom arm 34 are rotated along the side wall, and the side wall By moving the weight 38 along the bottom of the side wall, the side wall weight 38 moves along the top of the slime, causing the side wall wire 39 to flex on the remaining portion of the slime. The slime remaining on the bottom and the amount of the slime accumulated can be confirmed by the difference in length between the central axis wire 37 and the side wall wire 39 caused by this bending.

According to the slime removal confirmation device 3 having such a configuration, the side wall wire 39 is moved along the side wall on the ground in a state where the slime removal confirmation device 3 is installed at the bottom of the excavation hole 4, and the central axis wire 37 and the side wall are moved. By confirming the difference in the length of the wire 39, it is possible to easily and reliably confirm the remaining state of the slime. Further, when a portion where the slime has not been completely removed is confirmed as a result of the confirmation, the slime can be reliably removed by treating only that portion with the sand pump 1 for slime treatment.

In the slime treatment system of this embodiment, as the next step, the slime-mixed water efficiently discharged using the sand pump 1 for treating slime is introduced into the slime separation tank 2 and treated.

The slime separation tank 2 consists of a first separation tank 21, a second separation tank 22 and a storage tank 23, as shown in FIG. A vibrating sieve 211 for removing gravel, dust, etc. from the slime-mixed water, a first slime separator 213 for separating slime from the first treated water by pumping up from the bottom of the first separation tank 21 by a pump 212, and a first separation. The bottom of the tank 21 is provided with a first discharge port 214 for discharging settled slime.

In addition, the second separation tank 22 introduces the first treated water, pulls it up from the bottom by the pump 222, and separates the slime and the second treated water. A second outlet 224 is provided for discharging settled slime.

The storage tank 23 includes a treated water tank 231 that introduces and stores the second treated water, and a pump 323 that supplies the second treated water to the outside.

The mechanism of treatment of the slime-mixed water by the slime separation tank 2 having the above configuration will be described in detail below.

The ground side end of the discharge pipe 18 connected to the slime processing sand pump 1 is connected to the vibrating screen 211 of the first separation tank 21. Large contaminants are removed by vibrating screen 211 . The vibrating sieve 211 has a carry-out mechanism, and the contaminants collected on the sieve are discharged out of the first separation tank 21 and treated as waste.

The relatively high-concentration slime-mixed water from which contaminants have been removed is once stored in the bottom of the first separation tank 21 , then pumped up by the pump 212 and introduced into the first slime separation device 213 . As the first slime separation device 213, for example, a cyclone device or the like can be used, whereby the slime is separated from the first treated water.

The separated slime is discharged from the first discharge port 214 provided at the bottom of the first separation tank 21 and accumulated in the sand receiving tank 24 . Also, the separated first treated water is introduced into the second separation tank 22 .

The first treated water having a relatively low slime concentration in the first separation tank 21 is stored at the bottom of the second separation tank 22 and then pumped up by the pump 222 and introduced into the second slime separation device 223 . As the second slime separation device 223, a cyclone device or the like similar to the first slime separation device 213 used in the first separation tank 21 can be used. This separates the slime from the second treated water.

The separated slime is discharged from the second discharge port 224 provided at the bottom of the second separation tank 22 and accumulated in the sand receiving tank 24 . The slime separated by the second slime separation device 223 passes through the slope portion 225 provided in the second separation tank 22 and is discharged from the second discharge port 224 provided at the lower end of the slope portion 225. can also

Next, the separated second treated water is introduced into the storage tank 23 . This second treated water is a good liquid with a sand content of approximately 1% or less from which most of the slime has been removed. In the slime treatment system of this embodiment, the second treated water stored in the treated water tank 231 of the storage tank 23 is pumped as a good liquid by the pump 232 provided in the treated water tank 231 and treated as waste water. 4 and used as a replacement liquid for primary slime treatment, or as a stabilizing liquid for excavation. Further, when used as a stabilizing liquid during excavation, a stabilizing agent such as bentonite may be put into the storage tank 23 in advance, mixed with the second treated water, adjusted, and delivered as a stabilizing liquid.

As described above, the slimes separated by the first slime separator 213 and the second slime separator 223 are discharged from the first discharge port 214 and the second discharge port 224, respectively, and accumulated in the sand receiving tank 24. Alternatively, the supernatant liquid of the sand receiving tank 24 can be returned to the vibrating screen 211 of the first separating tank 21 by the pump 241 and processed again. This makes it possible to recover and reuse the water content of the recovered slime mixed water as much as possible.

Although the slime processing system of the present invention has been described above based on the embodiments, the present invention is by no means limited to the above embodiments, and various modifications can be made without departing from the scope of the invention.

For example, in the above embodiment, recovery and regeneration of the slime-mixed water in the first slime treatment process have been described. It can also be applied to reuse.

Hereinafter, the slime processing system of the present invention will be specifically described with reference to examples. However, the present invention is not limited to the examples.
<Example 1>
A cylindrical steel casing with a diameter of 2450 mm was prepared, and silica sand No. 6 and No. 8 were put therein as pseudo-slime materials and mixed while introducing water to prepare pseudo-slime mixed water. The pseudo slime had a viscosity of 27 seconds, a pH of 9.9, and a specific gravity of 1.025.

Next, a slime processing sand pump having the following performance is connected to a slime separation tank having the following performance, and is operated for 40 minutes while being fixed to the central bottom part of the casing, and is placed in the storage tank of the slime separation tank. The slime mixed water was collected while supplying the second treated water (good liquid). Assuming that the initial slime volume was 100%, the residual slime after the test was recovered and the ratio of the slime volume was calculated. Table 1 shows the results.
(Sand pump performance for slime processing)
Output: 9kW
Number of stirring blades: 3 Stirring blade angle: 13°
Discharge capacity: (clear water) 108-150m ³ /h, (muddy water) 54-75m ³ /h
Total lift: 15/8m
Diameter: 100mm
Effective depth: 70m
(slime separation tank performance)
First separation tank: ^12m3
Vibrating sieve: 1 unit (3.2 mm opening)
Pump (for 1st separation tank): 11 kW 4 units 1st slime separation device (cyclone): 2 units 2 units 2nd separation tank: 12 m ³
Pump (for 2nd separation tank): 9 kW 1 unit 2nd slime separation device (cyclone): 2 units Storage tank: 12 m ³
Width: 6.3m, Depth: 2.35m, Height: 1.9m
Processing capacity: 60-120m ³ /h
<Example 2>
The slime volume ratio was determined in the same manner as in Example 1, except that a cylindrical steel casing with a diameter of 2900 mm was used. Table 1 shows the results.
<Example 3>
The slime volume ratio was determined in the same manner as in Example 1, except that a cylindrical steel casing with a diameter of 3500 mm was used. Table 1 shows the results.
<Example 4>
The slime volume ratio was obtained in the same manner as in Example 1, except that a cylindrical steel casing with a diameter of 3850 mm was used and the slime-mixed water was recovered while rotating along the inner wall. Table 1 shows the results. FIG. 5A shows the state of residual slime after treatment, which was measured using the slime removal confirmation device shown in FIG. The numerical values in the figure indicate the height (mm) of residual slime.
<Comparative Example 1>
The slime capacity ratio was obtained in the same manner as in Example 1 except that a cylindrical steel casing with a diameter of 3850 mm was used and a submersible sand pump having the following performance was used. Table 1 shows the results.
(Underwater sand pump performance)
Output: 22kW
Discharge capacity: Fresh water 2.0-4.0m ³ /h
Total lift: 30/20m
Diameter: 200mm
Effective depth: Ground plane -73m
<Comparative Example 2>
The slime volume ratio was obtained in the same manner as in Comparative Example 1, except that a cylindrical steel casing with a diameter of 3850 mm was used and the slime-mixed water was recovered while rotating along the inner wall. Table 1 shows the results. FIG. 5(B) shows the state of residual slime after treatment, which was measured using the slime removal confirming device shown in FIG. In the figure, the numerical value on the center side indicates the width (mm) of the residual slime, and the numerical value on the arrow indicates the height (mm) of the residual slime.

From the results in Table 1, the combinations of the slime processing pumps and the slime separation tanks of Examples 1 to 4 have a significantly higher residual slime volume ratio than the combinations of the submersible sand pumps and the slime separation tanks of Comparative Examples 1 and 2. It was confirmed that the

In addition, in a casing with a relatively large diameter, recovery while rotating along the inner wall of Example 4 rather than recovery in a state fixed to the central bottom part of Examples 1 to 3 greatly increases the residual slime volume ratio. was less than Moreover, in Comparative Example 2, it was confirmed that the volume ratio of the residual slime was higher than that in Examples 1 to 4, even when the ordinary underwater sand pump was used to rotate and collect the slime.
<Example 5>
In Example 4, the slime-mixed water passed through the sand pump for slime treatment was sampled from immediately after the start to 40 minutes, and the sand content was measured for each hour. The results are shown in Table 2 and the photographs in FIG.

From the results in Table 2, it was confirmed that the slime mixed water can be treated and replaced with a good liquid having a sand content of 1% or less in a short time of 30 to 40 minutes after the start of operation.

From these results, according to the slime treatment system of the present invention, it is possible to efficiently recover and separate the slime-mixed water in the borehole and to reduce the amount of residual slime in the borehole after recovery. was confirmed.

1 sand pump for slime processing 10 sand pump 12 screw 120 drive rotating shaft 13 upper water flow direction restriction plate 14 upper mounting disk 15 lower water flow direction guide plate 16 connecting member (hanging bolt)
2 slime separation tank 21 first separation tank 211 vibrating screen 212 pump 213 first slime separation device 214 first discharge port 22 second separation tank 222 pump 223 second slime separation device 224 second discharge port 23 storage tank 231 treated water tank 232 Pump 3 Slime Removal Confirmation Device 31 Bottoming Member 32 Pipe 33 Floating Member 34 Bottom Arm 35 Intermediate Arm 36 Center Weight 37 Central Axis Wire 38 Side Wall Weight 39 Side Wall Wire 4 Boring Hole

Claims (5)

A slime treatment system for treating slime mixed water in a borehole using a slime treatment sand pump and a slime separation tank,
The slime separation tank consists of a first separation tank, a second separation tank and a storage tank,
Above the first separation tank, a vibrating screen for removing gravel and debris from the slime-mixed water collected by the sand pump for slime treatment;
a first slime separation device for separating slime and first treated water by pumping up from the bottom of the first separation tank;
A first discharge port for discharging the slime that has settled at the bottom of the first separation tank,
a second slime separation device for introducing the first treated water into the second separation tank and pulling it up from the bottom by a pump to separate the slime and the second treated water;
A second discharge port for discharging the slime that has settled at the bottom of the second separation tank,
The storage tank includes a treated water tank for introducing and storing the second treated water, and a pump for supplying the second treated water to the outside ,
a good liquid replacement step of recovering the slime mixed water in the drill hole by the sand pump for slime treatment and replacing the second treated water while supplying it as a good liquid;
In the good liquid replacement step, a bottom-landing member that settles near the center of the bottom of the borehole, a pipe attached to the top of the bottom-grounding member in parallel with the borehole,
a float member provided on top of the pipe;
an intermediate arm extending from the float member toward the sidewall;
a bottom arm provided on the bottom landing member and extending toward a bottom sidewall of the borehole;
a central axis wire that is inserted through the pipe and has a central weight connected to its tip end for sinking to the bottom of the borehole;
Using a slime removal confirmation device equipped with a side wall wire inserted through an insertion hole provided at the tip of the intermediate arm and the bottom arm and having a side wall weight connected to the tip for sinking to the bottom side wall of the excavation hole,
With the center weight and the side wall weight of the slime removal confirming device settling on the bottom of the borehole, the side wall weight is moved along the bottom side wall of the borehole, whereby the central shaft wire and the side wall wire are moved. A slime treatment system characterized by confirming the removal state of slime on the bottom side wall of an excavation hole by the difference in length . The sand pump for slime treatment is disposed at the center of the sand pump, a cylindrical upper water flow direction restricting plate, and the upper water flow direction restricting plate, and is fixed to the lower end of the driving rotation shaft of the sand pump. a screw, an upper mounting disc provided on the upper portion of the upper water flow direction restricting plate, a conical lower water flow direction guide plate provided below the screw, the upper mounting disc and the 2. The slime treatment system according to claim 1, further comprising a connecting member for connecting the lower water flow direction guide plate. 3. The slime treatment system according to claim 2, wherein the angle of the stirring blades of the screw is in the range of 10 to 18 degrees with respect to the horizontal plane of the upper mounting disc. 4. The slime processing system according to any one of claims 1 to 3, wherein a plurality of said first slime separating devices and second slime separating devices are provided. 5. The slime-mixed water according to any one of claims 1 to 4 , wherein in the good liquid replacement step, the slime mixed water is recovered while rotating the sand pump for treating slime along the bottom side wall of the excavation hole. slime processing system.

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