JPH11324009A - Method and equipment for excavation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique for excavating ground through which the ground can be continuously excavated while reusing excavating water in a circulation system and easily recovering soil in a reusable condition, in slurry generating in excavating works. SOLUTION: This excavating equipment 10 is provided with an excavation part 13 excavating a ground 12 while jetting high pressure water 11, a high pressure-generating part 14 supplying high pressure water 11 to the excavation part 13, a solid-liquid separator 16 continuously sucking slurry 15 including soil generated on excavating the ground through a suction pipe 19 and separating the soil from the slurry and discharging them, and a suspended water treatment device 17 treating the suspended water discharged from the soli-liquid separator 16 to separate clarified water from granular solid materials and discharge them. Further, a water pipe 18 is laid to send the clarified water discharged from the suspended water treatment device 17 to the high pressure- generating part 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for excavating a ground using high-pressure water in various civil works and the like.

[0002]

2. Description of the Related Art When excavating a ground using a construction machine, especially in an urban area, there is a high risk of breaking or cutting various pipes and optical fibers buried underground. As shown in FIG.
The so-called water jet method, in which excavation work is performed by injecting high-pressure water 71 supplied from a water source to the ground 72, is increasing.

[0003] In the water jet method, a large amount of muddy water 73 including earth and sand is generated during excavation work using high-pressure water 71, and these muddy waters 73 use a suction vehicle 76 provided with a suction device 74 and a storage tank 75. Suction and collecting. The collected muddy water 73 is discarded after being moved to a predetermined disposal place by moving a suction truck 76.

For this reason, the storage tank 7 provided in the suction wheel 76
When 5 becomes full of muddy water 73 or the like, the suction work of muddy water 73 must be stopped, and the suction truck 76 must be moved to a predetermined disposal place. Thereafter, the muddy water in the storage tank 75 is discarded, and the excavation work can be resumed when the suction truck 76 returns to the excavation work site.

Therefore, when performing a large-scale excavation work, the suction truck 76 has to go back and forth between the disposal site and the construction site many times, and the excavation work is interrupted each time, so that the work efficiency is low. . In particular, when the disposal site is far away from the excavation site, the work efficiency is significantly reduced.

In such a case, if a plurality of suction wheels 76 are used, the time during which the excavation work is interrupted is shortened.
In addition to new problems such as congestion of traffic near the site and an increased risk of accidents due to the increase in
By increasing 6, the cost also increases.

In order to solve such a problem, muddy water generated in the jet water excavation work is collected and subjected to a predetermined treatment to separate it into sediment and clarified water, and the clarified water is circulated for drilling work. A technique that can be reused has been developed and is disclosed in Japanese Patent No. 2509141 and the like.

[0008]

Problems to be Solved by the Invention Patent No. 2509141
In the case of the jet-water-free pollution digging device disclosed in Japanese Unexamined Patent Publication, since the mud precipitated in the high-pressure tank that sucked the mud is solidified by adding a coagulant, the door is opened and discharged. When the mud settled in the tank reaches an allowable limit, it is necessary to temporarily stop the suction operation and perform the discharging operation. Therefore, when performing excavation work in which mud exceeding the capacity limit of the high-pressure tank is performed, the suction operation must be temporarily stopped and the discharge operation must be performed each time the mud reaches the allowable limit, and continuous operation cannot be performed. .

In such a case, it is possible to reduce the frequency of work stoppages by increasing the capacity of the high-pressure tank, but there is a limit to the increase in the size of the tank transport work vehicle that is required. Therefore, there is an upper limit for increasing the tank capacity. Therefore, in the case of large-scale excavation work that generates a large amount of mud, even if a large-capacity tank is used,
Stopping the suction work when discharging mud in the high-pressure tank is inevitable.

In the case of the pollution-free drilling apparatus using jet water, since the transfer of muddy water from the suction section to the centrifugal separation section is performed by feeding high-pressure air, the muddy water is transferred after the suction operation is stopped. In some cases, the entire apparatus cannot be stopped until all the operations are completed, and it may not be possible to quickly move from the site. On the other hand, since the muddy water containing the sludge flocculated in the forced sedimentation section is transferred from the lower drain valve to the dewatering / separation section via the drain pump, the sludge may stay in the transfer hose.

Further, the sludge cake discharged from the dewatering / separation section has a high water content and cannot be reused as backfill material or the like as it is. It is necessary to provide a new treatment step to secure the reusable or reusable properties.

[0012] Therefore, an object of the present invention is to make it possible to continuously perform excavation work while circulating and reusing drilling water, and to easily reuse muddy sediment generated in excavation work. It is an object of the present invention to provide a ground excavation technique that can be recovered with various properties.

[0013]

In order to solve the above-mentioned problems, a drilling apparatus according to the present invention comprises a drilling section for digging ground by ejecting high-pressure water, and a high-pressure water generating section for supplying high-pressure water to the drilling section. , A solid-liquid separation unit that continuously sucks in muddy water containing sediment generated during excavation and separates and discharges muddy water into sediment and suspended water, and separates floc and clear water by adding a flocculant to the suspended water A suspension water treatment unit having a coagulation / separation means, a solidifying material and a solidification aid added to the floc, and a granulating means for turning the floc into a granular solid by stirring, and sending the clarified water to the high-pressure water generating unit. And a water supply means.

With this configuration, muddy water mixed with earth and sand that is generated when excavating the ground with high-pressure water pressurized from the high-pressure water generating section to the excavating section is continuously output by the solid-liquid separating section. In the process of being sucked and muddy water passing through the solid-liquid separation section and the suspension water treatment section, sediment and suspended components are sequentially separated, and finally, granular solids and reusable clear water are formed. can get. Therefore, by sending the clarified water to the high-pressure water generating section, it can be used again as high-pressure water for excavation work, and excavation work can be continuously performed.

The earth and sand discharged from the solid-liquid separation section and the granular solid discharged from the suspension water treatment section can be reused as they are for backfilling. The trouble of carrying out and treating from the site can be saved, and it can contribute to the reduction of industrial waste.

The structure of the solid-liquid separation section includes a plurality of storage tanks capable of absorbing and storing muddy water containing earth and sand generated during excavation, a switching means for selecting a storage tank for storing muddy water, and a storage tank. It is possible to employ a structure including a discharging means for discharging the mud contained in the storage tank and a sieving means for separating and discharging the mud discharged from the storage tank into earth and sand and suspended water.

With such a structure, muddy water generated during excavation is sucked and stored in one storage tank.
When this storage tank is full of muddy water, the storage destination of the muddy water is switched to another storage tank, and during this time, the muddy water in the storage tank can be discharged and stored again, so that the muddy water can be sucked. Can be performed continuously.

Further, since the muddy water discharged from the storage tank is separated into sediment and suspended water by a sieving means and discharged, the sediment can be carried out, and the suspended water is sent to a muddy water treatment section. It can be processed. In this case, as the sieving means, a vibrating sieve provided with a mesh or a perforated plate that allows only the suspension water to pass and a vibration mechanism that vibrates them can be employed.

On the other hand, in the excavator of the present invention, the suspension water treatment section is configured as described above, so that the suspension water is separated into clarified water and floc, and the floc containing water is converted into granular solid having a low water content. Can be a body. Here, the floc refers to a particle aggregate generated by aggregation and which can be regarded as independent particles. In addition, the granular solid is a granular material having a diameter of about 1 mm to 10 mm, having a performance similar to fine aggregate used as building aggregate, and having a property that it is not easily scattered by wind or the like in the outside air. Is what you have.

In this case, EF-2 (trade name) which is a drug containing sodium alginate as a coagulant,
Alternatively, a polymer flocculant ED-1 (trade name), ED
-2 (trade name) (all distributors: DI Techno Co., Ltd.) and the like can be preferably used. Further, as the solidifying material, quick lime or a calcium oxide-based drug, such as Staby P (trade name), Staby S (trade name), and Staby G (trade name) (all sold by DCR System Co., Ltd.), etc. As the solidification aid, calcium carbonate, dry sand, slag, incinerated ash and the like can be suitably used, whereby a granular solid having a water content of about 30% to 50% can be obtained.

Further, the excavator of the present invention is provided with a moving means for moving the high-pressure water generating section, the solid-liquid separating section, and the suspension water treating section, so that the excavating section can be easily moved to the excavating work site. It is possible to appropriately cope with the movement of the work point accompanying the progress of the work, and the work efficiency is improved. In this case, in order to make the high-pressure water generation unit, the solid-liquid separation unit, and the suspension water treatment unit movable, for example, a method of mounting these devices on a truck equipped with wheels, or a crane or the like on these devices In this case, a method of providing a lock that can be lifted by the above method can be adopted.

Further, in the excavator of the present invention, an automobile may be used as a moving means of the high-pressure water generating section, the solid-liquid separating section, and the suspended water treating section. By mounting these devices in an automobile, quick movement becomes possible and mobility is improved, so that work efficiency is improved and the construction period can be shortened.

On the other hand, the excavation method of the present invention uses the above-described excavator to circulate water among the high-pressure water generating section, the excavating section, the solid-liquid separation section, and the suspension water treating section, while digging the ground at the excavating section. It is characterized by excavation. Thus, the high-pressure water generator,
Since the ground is excavated while circulating water between the excavation section, solid-liquid separation section, and suspension water treatment section, the water consumption is small, and the water circulation is performed continuously and there is no interruption in the excavation work , Work efficiency is improved. Further, since muddy water generated during the excavation work is not discharged from the site, there is no risk of environmental pollution.

[0024]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram showing a configuration of an excavator according to an embodiment.

The excavator 10 according to the present embodiment includes a high-pressure water 11
Excavating section 13 for excavating ground and excavating ground 12, and excavating section 1
A high-pressure water generating unit 14 for supplying high-pressure water 11 to the pump 3 and a solid-liquid separating unit 16 for continuously sucking muddy water 15 mixed with earth and sand generated during excavation through a suction pipe 19 and separating and discharging the soil and muddy water. And a suspension water treatment unit 17 for separating and discharging the suspension water discharged from the solid-liquid separation unit 16 into granular solids and clarified water, wherein the clarified water discharged from the suspension water treatment unit 17 is A water supply pipe 18 for supplying water to the water generator 14 is provided.

Here, with reference to FIGS.
The structure and the like of the solid-liquid separation unit 16 that constitutes 0 will be described in detail. 2 is a side view showing the solid-liquid separation unit 16, FIG. 3 is a plan view showing the solid-liquid separation unit 16, and FIG. 4 is a rear view showing the solid-liquid separation unit 16.

The solid-liquid separation section 16 determines which storage tanks 31 and 32 are capable of sucking and storing the muddy water 15 containing earth and sand generated during excavation, and which of the storage tanks 31 and 32 is to store the muddy water. Opening and closing valves 33, 34 for selection;
A spiral plate 35 for stirring and discharging the muddy water 39 stored in the storage tanks 31, 32;
The vibrating sieve 38 separates and discharges the muddy water 39 discharged from 2 into earth and sand 36 and suspended water 37. Further, a vacuum pump 60 for sucking muddy water into the storage tanks 31 and 32 and a drive motor 61 for rotating the storage tanks 31 and 32 forward and backward are provided.

In the excavation work, the vacuum pump 60 is operated to make the inside of the storage tank 31 vacuum, so that the generated muddy water is sucked from the suction port 62 into one of the storage tanks 3.
Suction and house in 1. In this case, the storage tank 31 is rotated forward by the drive motor 61, and the stored muddy water 3
9 is stirred by the spiral plate 35. When the storage tank 31 is full of muddy water 39, the open / close valve 33,
34 and the vacuum switching valve 63
By switching the storage destination of the muddy water to the other storage tank 32, the suction and storage operations can be continued.

On the other hand, when the vacuum of the storage tank 31 is released and the storage tank 31 is rotated in the reverse direction while the suction and storage in the storage tank 32 are performed, the stored muddy water 39 is moved by the spiral plate 35 to the storage tank 31. From the vibrating sieve 38 through the chute 64, and is separated into earth and sand 36 and suspended water 37 and discharged. As a result, the storage tank 31 can again store muddy water, and when the storage tank 32 is full of muddy water 39, the open / close valves 33, 3 are opened.
If the same operation as described above is performed by reversing the open / close states of the vacuum switching valve 63 and the vacuum switching valve 63, the suction and storage of the muddy water into the storage tank 31 can be resumed, so that the suction of the muddy water can be continued.

As described above, the solid-liquid separation section 16 includes the two storage tanks 31 and 32, the open / close valves 33 and 34, the vacuum switching valve 63, and the like. Can be performed while alternately using the storage tanks 31 and 32, so that muddy water generated during excavation can be continuously suctioned.

The muddy water 39 discharged from the storage tanks 31 and 32 is subjected to vibrating sieve 38 to sediment 36 and suspended water 37.
And the soil 36 is conveyed separately.
The suspended water 37 can be carried out using a submersible pump 66.
Thereby, water can be sent to the suspension water treatment unit 17 to perform a predetermined treatment.

Next, referring to FIGS.
The structure, function, and the like of the suspension water treatment unit 17 constituting the above will be described. FIG. 5 is a partially cutaway side view showing the suspension water treatment unit 17, and FIG. 6 is a plan view showing the suspension water treatment unit 17.

In the suspension water treatment section 17, the muddy water 37 discharged from the solid-liquid separation section 16 is injected into the vibrating screen 42 via the receiving pipe 41 by the submersible pump 66, and is separated into solids and suspension water. After that, the solid content is put into a biaxial bag mill mixer 43, and the suspension water is put into a stirring tank 44.

In the twin-screw bag mill mixer 43, a solidifying agent and a solidifying aid are added from a solidified material storage tank 45 and a solidification aid storage tank 46, respectively, and stirring is performed.

For the suspension water in the stirring tank 44,
After the coagulant in the coagulant storage tank 47 is added by the coagulant metering pump 48, the coagulant is sent to the separation tank 50, where the floc and the clarified water are separated in the separation tank 50, and the floc settles at the bottom. This flock is
After being dropped into the reticulated bucket 52 while passing over the separation tank 50, the water in the floc is dropped, and is then fed into the two-axis bag mill mixer 43.

Therefore, in the biaxial bag mill mixer 43, the solid content, the solidifying material, the solidifying aid and the floc are mixed and stirred to generate a water-absorbing exothermic reaction of the calcium oxide contained in the solidifying material, and the solidifying aid is mixed. Is performed, and a granular solid body 58 can be obtained. The granular solid body 58 is discharged by a drawing screw conveyor 53, a vertical screw 54, and an upper screw conveyor 55. As shown in FIG. 6, the upper screw conveyor 55 can rotate around the screw rotation fixing device 56, so that the discharge position can be changed.

On the other hand, as shown in FIG. 1, the clarified water in the separation tank 50 is sent to the high-pressure water generator 14 through the water pipe 18 and can be reused as digging water in the digging section 13. The suspension water in the stirring tank 44 is also pump 57
And it can be reused as drilling water.

As described above, the suspension water treatment section 17 separates and discharges the suspension water 37 sent from the solid-liquid separation section 16 into granular solids 58 and clear water without using a dehydrator. The granular solid can be reused as it is as a backfill material, and the clear water can be reused as drilling water.

In this embodiment, EF-2 (trade name) which is a drug containing sodium alginate, ED-1 (trade name) which is a polymer flocculant, and ED-
2 (trade name) (all distributors: DI Techno Co., Ltd.) was able to obtain an excellent coagulation effect. In addition, as a solidifying agent, STABY P (trade name), STABY S (trade name), and STABY G (trade name), which are calcium oxide-based drugs (all sold by DCR System Co., Ltd.), When calcium carbonate, dry sand, slag, incinerated ash and the like were used as the material, a granular solid body 58 having a water content of about 30% to 50% could be obtained.

As described above, the muddy water 15 mixed with earth and sand generated when the ground 12 is excavated with the high-pressure water pressurized from the high-pressure water generator 14 to the excavator 13 is continuously converted by the solid-liquid separator 16. The muddy water 15 is sucked and collected, and
6 and the suspended water treatment section 17, the sediment 36 and suspended components are sequentially separated, and finally, a granular solid content 58 and clarified water are obtained. By sending water to the generator 14, it can be used again as high-pressure water for excavation work.

The soil 36 discharged from the solid-liquid separation unit 16 and the granular solid 5 discharged from the suspension water treatment unit 17
8 can be reused as it is for backfilling as it is, so that it is possible to save time and effort for unloading and processing from a construction site and to contribute to reduction of industrial waste. Note that the granular material 58 has good transportability even when it is carried out to the outside by a transport vehicle or the like.

In the excavator 10 of the present embodiment, the high-pressure water generator 14, the solid-liquid separator 16, and the suspension water processor 17 are mounted on the automobiles 21, 22, 23, respectively, so that they can be moved. Therefore, it becomes possible to quickly move to the excavation work site or to move the work point along with the progress of the excavation work, and to increase mobility,
The work efficiency is improved, and the construction period can be shortened. In addition, as another moving means, for example, a method of mounting the high-pressure water generator 14, the solid-liquid separation unit 16, and the suspension water treatment unit 17 on a truck equipped with wheels, or lifting these devices by a crane or the like. It is also possible to adopt a method of providing a possible locking member.

As described above, if the excavator 10 of the present embodiment is used to excavate the ground 12 while circulating water between the high-pressure water generator 14, the solid-liquid separator 16, and the suspension water processor 17. Since the suction operation of the muddy water 15 is not interrupted, the operation efficiency is improved. In addition, since the muddy water 15 generated during the excavation work is not taken out of the site, there is no risk of environmental pollution.

[0044]

According to the present invention, the following effects can be obtained.

(1) A digging section for digging the ground by squirting high-pressure water, a high-pressure water generating section for supplying high-pressure water to an excavator, and a muddy water containing sediment generated during digging to continuously suck muddy water. A solid-liquid separation unit that separates and discharges the suspension water, a suspension water treatment unit that separates the suspension water discharged from the solid-liquid separation into granular solids and clear water, and a suspension water treatment unit that discharges the suspension water By providing a water sending means for sending the clarified water to the high-pressure water generating section, it is possible to continuously collect muddy water mixed with earth and sand generated during excavation work and separate it into granular solids and clarified water. In addition, excavation work can be performed while circulating and reusing the clear water, and work efficiency is improved because the excavation work is not interrupted. Furthermore, the granular solid can be reused as it is as a backfill material or the like, and there is no risk of environmental pollution since muddy water generated during excavation work is not discharged from the site.

(2) Providing moving means for moving the high-pressure water generating section, the solid-liquid separating section, and the suspension water treating section makes it easy to move to the excavation work site, and the work site associated with the progress of the excavation work Work efficiency can be improved because it is possible to appropriately cope with the movement of the vehicle.

(3) By using an automobile as a moving means of the high-pressure water generation section, the solid-liquid separation section and the suspension water treatment section,
Since quick movement is possible and mobility is enhanced, work efficiency is improved and the construction period can be shortened.

(4) By digging the ground at the digging section while circulating water between the high-pressure water generating section, the solid-liquid separating section, and the suspension water treating section, using the digging apparatus according to the first to third aspects. ,
The water consumption can be reduced, and the work efficiency is improved because the excavation work is not interrupted. Further, since muddy water generated during excavation work is not discharged from the site, there is no risk of environmental pollution.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a configuration of an excavator according to an embodiment.

FIG. 2 is a side view showing a solid-liquid separation unit of the excavator of FIG.

FIG. 3 is a plan view showing a solid-liquid separation unit in FIG. 2;

FIG. 4 is a rear view showing the solid-liquid separation unit in FIG. 2;

FIG. 5 is a side view showing a suspended water treatment section of the excavator of FIG. 1;

FIG. 6 is a plan view showing a suspension water treatment unit of FIG.

FIG. 7 is an explanatory diagram showing a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Drilling apparatus 11 High pressure water 12 Ground 13 Excavation part 14 High pressure water generation part 15, 39 Muddy water 16 Solid-liquid separation part 17 Suspended water treatment part 18 Water pipe 19 Suction pipe 21, 22, 23 Automobile 31, 32 Storage tank 33, 34 Opening / closing valve 35 Spiral plate 36 Earth and sand 37 Suspended water 38 Vibrating sieve 41 Receiving pipe 42 Vibrating screen 43 Biaxial bag mill mixer 44 Stirrer tank 45 Solidification material storage tank 46 Solidification aid storage tank 47 Coagulant storage tank 48 Coagulant pump 53 Pull-out screw Conveyor 54 Vertical screw 55 Upper screw conveyor 56 Screw rotation fixing device 58 Granular solid body 60 Vacuum pump 61 Drive motor 63 Vacuum switching valve 64 Chute 65 Conveyor 66 Submersible pump

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroyuki Uenaga 2-82 Watanabe-dori, Chuo-ku, Fukuoka City, Fukuoka Prefecture Inside Kyushu Electric Power Co., Inc. Kyushu Electric Power Co., Inc. (72) Inventor Takato Nakajima 1-19-19 Nabeshima, Saga City, Saga Prefecture DI Techno

Claims (4)

[Claims] An excavation unit for excavating high-pressure water to excavate the ground, a high-pressure water generating unit for supplying high-pressure water to the excavation unit, and a muddy water that continuously sucks mud containing earth and sand generated during excavation. A solid-liquid separation unit that separates the suspension into sediment and suspension water and discharges it; a coagulation separation unit that adds a flocculant to the suspension water and separates the floc into clarified water; A suspension water treatment unit having a granulation unit for converting the floc to a granular solid by stirring, and a water supply unit for supplying the clarified water to the high-pressure water generation unit. Drilling rig. 2. The excavator according to claim 1, further comprising a moving unit configured to move the high-pressure water generation unit, the solid-liquid separation unit, and the suspension water treatment unit. 3. The excavator according to claim 2, wherein the moving means is an automobile equipped with the high-pressure water generating section, the solid-liquid separating section, and the suspended water treating section. 4. An excavator according to claim 1,
An excavation method, wherein the ground is excavated by the excavation section while circulating water between the high-pressure water generation section, the excavation section, the solid-liquid separation section, and the suspension water treatment section.