JPH0967566A - Apparatus for producing stabilizing fluid for ground excavation and production of the fluid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an apparatus for producing a stabilizing fluid for ground excavation wherewith the reduction in mixing time and the mass production are enabled. SOLUTION: This apparatus has a water-supply section 12 for supplying water W under pressure, a powder-supply section 14 for supplying a powder A (e.g. bentonite or a water-sol. polymer), and a jet pump 16 for mixing the water W with the powder A. The pump 16 has a pipe body 16a and a jet nozzle 16b; a suction pipe 16d wherewith a discharge end of a screw feeder 14b communicates is connected to a vacuum chamber 16c; and a water-supply channel 12b of the water-supply section 12 communicates with and is connected to the nozzle 16b. When the pressurized water W is supplied to the nozzle 16b, then the water W is jetted as a jet water stream W' from the tip of the nozzle 16b into the pipe body 16a at a high speed, forming a vacuum zone around the stream W', and the powder A is drawn from the pipe 16d into the vacuum zone and mixed into the stream W' from its outside, thus giving a stabilizing fluid B.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for producing a stabilizing solution for ground excavation and a method for producing the stabilizing solution.

[0002]

2. Description of the Related Art In the underground continuous wall construction method, earth drill construction method, mud shield construction method, etc., a stabilizing solution such as bentonite mud is used in order to stabilize the wall surface of the excavation hole and the excavation face. This type of stabilizing solution is a powdered bentonite or water-soluble polymer, for example, an aqueous solution in which CMC (carboxymethyl cellulose) and water are mixed, and if necessary, an additive such as a dispersant or a mudguard is used. Added to.

Conventionally, such a stabilizing solution manufacturing method has been manufactured using a manufacturing apparatus as shown in FIGS. The manufacturing apparatus shown in FIG. 2 is of a mechanical stirring type and has a tank 1, a stirring blade 2 installed in the tank 1, and a driving motor 3 for driving the stirring blade 2. When the stabilizer is produced, water and bentonite or a water-soluble polymer are put into the tank 1 and the stirring blade 2 is rotated by the drive motor 3 to mix them.

The manufacturing apparatus shown in FIG. 3 is of a circulation agitation system, and comprises a tank 1, a circulation path 4 connected to the tank 1 and a slurry pump interposed in the circulation path 4. 5 and 5. When producing a stable liquid with this apparatus, water and bentonite or a water-soluble polymer are put into the tank 1 and the slurry pump 5 is driven to circulate the liquid in the tank 1 through the circulation path 4. , Mix these.

However, such a conventional manufacturing apparatus and manufacturing method have the following technical problems.

[0006]

That is, in the above-described manufacturing apparatus and manufacturing method, water and powder material are simply
Although the mixture is agitated and mixed by mechanical means such as rotation of the agitating blade 2 and circulation by a pump 5, when the powdered bentonite or the water-soluble polymer is solidified in a dumpling shape when contacted with water, this is uniformly dispersed. There was a problem that it took a long time to do so.

Further, since the above-mentioned conventional manufacturing apparatus is a method of batch-processing a fixed amount to produce a stabilizing solution, a large-scale apparatus or a large number of apparatuses are required to produce a large amount of stabilizing solution. It also requires a large equipment site and a large number of workers. The present invention has been made in view of such conventional problems, and an object of the present invention is an apparatus capable of producing a large amount of a stabilizing solution in a short time while avoiding an increase in the size of the apparatus. And to provide a method.

[0008]

In order to achieve the above object, a manufacturing apparatus according to the present invention is used for ground excavation, which is manufactured by mixing water with water-absorbing powder particles such as bentonite and water-soluble polymer. In a stabilizing liquid manufacturing apparatus, the manufacturing apparatus includes a water supply unit that pressurizes and supplies the water, the powdery or granular material supply unit, and a jet pump that mixes the water and the powdery or granular material. The jet pump has an injection nozzle to which the water supply unit is connected, a vacuum chamber provided on the outer circumference of the injection nozzle, one end opened in the vacuum chamber, and the powdery or granular material supply unit connected to the other end side. And a suction pipe. In this case, the powder or granular material supply unit may be provided with a feeder unit for feeding the powder or granular material by a constant amount. Further, the production method according to the present invention is a method for producing a stable liquid for ground excavation in which water is mixed with powdered particles such as bentonite or a water-soluble polymer, and the water is pressurized and supplied to a jet nozzle of a jet pump. At the same time, the powder and granules are supplied from a suction pipe that opens in a vacuum chamber provided on the outer periphery of the injection nozzle,
By injecting the water from the injection nozzle, the water and the granular material are mixed to produce the ground excavation stable liquid. According to the manufacturing apparatus and the manufacturing method of the above configuration,
When pressurized water is jetted from the jet nozzle of the jet pump, water is jetted from the tip of the jet nozzle at high speed to form a jet water stream, and a vacuum area is formed around the jetted jet water stream. Particles such as bentonite and water-soluble polymer are attracted from the suction pipe, and the particles are mixed from the outer circumference of the jetted water stream.

[0009]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 shows an embodiment of an apparatus for producing a stabilizing solution according to the present invention.
The manufacturing apparatus 10 shown in FIG. 1 includes a water supply unit 12 for supplying water W under pressure, a granular material supply unit 14 for supplying granular material A such as bentonite or a water-soluble polymer, water W and granular material. And a jet pump 16 for mixing with A.

The water supply unit 12 has a water tank 12a for containing water W, a water supply path 12b having one end communicating with the water tank 12a, and a pump 12c interposed in the water supply path 12b. ing. Here, the pump 12c is water W
Is pressurized and delivered, and for example, a high-lift submersible pump or a slurry pump can be used. In the water supply unit 12 configured in this way, when the pump 12c is driven, the water W in the water tank 12a is transferred to the pump 12c.
Is discharged from the other end side of the water supply path 12b in a state of being pressurized. In this case, although not shown in the drawing, a flow control valve or a pressure regulating valve may be provided in the water supply path 12b on the downstream side of the pump 12c to control the pressure or flow rate of the water W.

The powder / granule supply unit 14 has a hopper 14a for storing the powder / granule A, a screw feeder 14b provided at the lower end of the hopper 14a, and a rotation driving motor 14c for the screw feeder 14b. . In the powder / granule supply unit 14 configured as described above, when the motor 14c is rotationally driven, the powder / granule A from the tip of the screw feeder 14b corresponds to the rotation amount of the motor 14c to a certain amount within a certain time period. Can be discharged.

The jet pump 16 comprises a pipe body 16a having one end opened and the other end closed, and an injection nozzle 16b penetratingly installed in the center of the closed end of the pipe body 16a. The interior of the chamber is a vacuum chamber 16c. A suction pipe 16d is connected in communication with the inside of the vacuum chamber 16c. The water supply path 12b of the water supply unit 12 is connected to the injection nozzle 16b.

Further, the suction pipe 16d is provided with a powdery or granular material supply unit 1
The discharge end of the screw feeder 14b of No. 4 is connected and connected. Further, one end of a discharge hose 18 is communicatively connected to the open end of the tube body 16a, and a storage tank 20 for the manufactured stabilizing solution B is installed on the other end side of the discharge hose 18. When the stabilizing solution B is manufactured by the manufacturing apparatus 10 configured as described above, the water W is stored in the water tank 12a, and the granular material A is charged into the hopper 14a to drive the pump 12c and the driving device. The motor 14d is driven. When the pump 12c is driven, the water W is supplied to the injection nozzle 16b while being pressurized by the pump 12c.

When the pressurized water W is supplied to the jet nozzle 16b, this water W becomes a jet water flow W'from the tip of the jet nozzle 16b and is jetted into the pipe 16a at high speed and jetted. A vacuum region is formed around the jet water flow W ', and the granular material A such as bentonite or a water-soluble polymer is attracted to the vacuum region from the suction pipe 16d, and the powder particles are ejected from the outer periphery of the jet water flow W'which is being jetted. The body A is mixed, and the stabilizing solution B having a predetermined mixing ratio is obtained.

The stabilizing solution B then flows down through the discharge hose 18 and is discharged into the storage tank 20. In this process, the mixing and stirring is further promoted. Now, according to the manufacturing apparatus 10 and the manufacturing method of the stabilizing solution B configured as described above, the jet water flow W ′ is generated in the pipe body 16 a of the jet pump 16.
Since the water W and the granular material A are instantaneously mixed by the vacuum action of, the stabilizing solution B can be produced in a very short time.

Further, in the manufacturing apparatus 10 and the manufacturing method of the present invention, the stabilizing solution B is prepared by continuously mixing the water W and the granular material A.
Since it is manufactured, the mass production becomes possible and the apparatus 10 does not become large. Further, in the case of the present embodiment, for example, the driving motor 14c of the powdery or granular material supply unit 14 is used.
The rotation of the screw feeder 14d to adjust the supply amount of the powder or granular material A from the screw feeder 14d, or the water supply unit 12
By controlling the pump of No. 2 and adjusting the supply amount of water W, it is possible to easily produce the stabilizing solution B having a different mixing ratio.

In the above embodiment, as the powder A,
Although bentonite or a water-soluble polymer is shown as an example, in the apparatus of the present invention, a powdery or granular dispersant, a mudproofing agent, or the like can be added to these if necessary. Further, the screw feeder 14b of the powdery or granular material supply unit 14 may be a rotary rotary feeder.

[0018]

As described above in detail in the embodiments,
According to the manufacturing apparatus and the manufacturing method of the ground excavating stabilizing solution of the present invention, a large amount of stabilizing solution can be manufactured in a short time by a small apparatus.

[Brief description of drawings]

FIG. 1 is an overall view showing an embodiment of a manufacturing apparatus of a ground excavation stabilizing liquid according to the present invention.

FIG. 2 is an explanatory diagram showing an example of a conventional apparatus for manufacturing a stabilizing solution for ground excavation.

FIG. 3 is an explanatory diagram showing another example of a conventional apparatus for producing a stabilizing solution for ground excavation.

[Explanation of symbols]

 10 Stabilizer Manufacturing Equipment 12 Water Supply Section 12a Water Tank 12b Water Supply Path 12c Pump 14 Powder and Granules Supply Section 14a Hopper 14b Screw Feeder 14c Driving Motor 16 Jet Pump 16a Pipe 16b Injection Nozzle 16c Vacuum Chamber 16d Suction Pipe 18 Discharge Hose 20 Storage tank W Water W'Jet water flow A Granule B Stabilizer

Claims (3)

[Claims] 1. A manufacturing apparatus for a ground excavation stabilizing liquid, which is manufactured by mixing water and water-absorbing powdery or granular material such as bentonite or a water-soluble polymer, wherein A jet pump for mixing the water and the granular material, wherein the jet pump is an injection nozzle to which the water supply section is connected; An apparatus for producing a stable liquid for ground excavation, comprising: a vacuum chamber provided on the outer periphery; and a suction pipe having one end opened in the vacuum chamber and the other end side connected to the powdery or granular material supply unit. . 2. The apparatus for producing a stable liquid for ground excavation according to claim 1, wherein the powdery or granular material supply section has a feeder section for feeding out the powdery or granular material in constant amounts. 3. A method for producing a stable liquid for ground excavation, which comprises mixing water with powdered or granular material such as bentonite or a water-soluble polymer, and supplying the pressurized water to an injection nozzle of a jet pump, and the injection nozzle. The powder and granules are supplied from a suction pipe having an opening in a vacuum chamber provided on the outer periphery of and the water and the powder and granules are mixed by injecting the water from the injection nozzle to stabilize the ground excavation. A method for producing a stable liquid for ground excavation, which comprises producing a liquid.