JP3438181B2 - Mud water management device in mud pressurized shield method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction work in which muddy water is supplied to an excavation hole being formed in the ground to prevent collapse of an excavation surface. The present invention relates to a muddy water management device in a muddy pressure shield method for producing muddy water. 2. Description of the Related Art In an underground excavation work, the deeper the excavation hole, the greater the earth pressure, and a phenomenon occurs in which the excavation surface collapses due to the earth pressure. [0003] In order to solve this problem, conventionally, when digging a deep excavation hole, a muddy water having a specific gravity larger than water is put into the excavation hole to form a muddy film on the excavated surface, and the muddy water is formed. A muddy pressurized shield method is used in which the excavated surface is protected by a membrane while the excavated surface is prevented from collapsing by the pressure of the muddy water in the excavation hole pressing against the wall surface. FIG. 2 shows a jet flow mixer (Japanese Patent Application No. 8-17) of the present applicant used for this muddy water pressure shield method.
No. 89). The water supply port 4 is connected to the upper end of a jet flow pipe 3 having an expanded pipe diameter at both ends of the throttle section 2, and a jet nozzle 5 communicating with the water supply port 4 is provided.
The decompression chamber 6 is formed on the outer periphery of the jet nozzle 5 by approaching the tip of the jet nozzle 5 to the vicinity of the throttle part 2. A plurality of projecting rods 9 are formed on an inner peripheral surface of a mixing tube 8 connected to a lower end. [0005] As shown in FIG. 3, the jet flow mixer 1 is provided above the muddy water storage tank 11, the muddy water in the muddy water storage tank 11 is sucked up by a pump 12, and the water supply port 4 of the jet flow mixer 1 is provided. , A negative pressure is generated near the upper part of the throttle portion 2 of the jet flow pipe 3. On the other hand, a hose 13 is connected to the mud suction port 7 and the hose 13 is manually inserted into a storage tank (not shown) for storing the powder mud. The material is sucked by the negative pressure in the jet flow mixer 1 described above. Then, the powdery mud material is mixed with the supply water discharged from the jet nozzle 5 in the mixing pipe 8.
And agitated by the Karman vortex generated by the protruding rod 9 on the inner peripheral surface of the mixing pipe 8, thereby producing sufficiently dissolved muddy water without generating dust of powdery mud material. The muddy water storage tank 11 is provided with a pump 12 for sucking up the muddy water in the tank via the jet flow mixer 1 via the hose 12a into the muddy water storage tank 11 again. A pump 15 that sucks up to the muddy water adjusting tank 14 via 15a is provided. The mud in the mud storage tank 11 sucked up by the former pump 12 is supplied to the jet flow mixer 1.
By being stirred with the powdery mud material supplied into the inside, the muddy water concentration in the muddy water storage tank 11 can be gradually increased,
The mud in the mud storage tank 11 is sucked into the mud adjusting tank 14 by the latter pump 15. The muddy water adjusting tank 14 is provided with a stirrer 17 driven by a motor 16 to stir the inside of the muddy water adjusting tank 14 to prevent sedimentation of mud in this tank. . The muddy water adjusting tank 14
The excess mud from the tank is discharged to a waste tank 18. The muddy water in the muddy water adjusting tank 14 is supplied to the face 21 of the excavation hole 20 by a pump 19 provided in the muddy water adjusting tank 14 to form a mud on the wall surface of the cutting face 21. While protecting the wall surface of the excavation hole 20, the muddy water in the excavation hole 20 prevents the collapse of the excavation surface by the pressure of pressing the wall surface. Further, the muddy water supplied to the face 21 and the underground groundwater and the like are sucked up by a pump 23 into a filter tank 24 above the ground, and are separated into sand and water by the filter tank 24. To be stored. However, in the above-mentioned conventional muddy pressurized shield method, the powdery muddy material is stored in a muddy water storage tank from a powdery muddy storage tank (not shown). Requires manual labor to supply, requires the installation of at least two large tanks, a mud storage tank and a mud control tank, and requires a large number of pumps because each tank requires a pump. There are problems such as
The solution was desired. The present invention has been made in view of such circumstances, and a muddy pressurized shield method for supplying muddy water to an excavation hole being formed in the ground to prevent collapse of the excavated surface. The muddy water pressure shield method, which completely eliminates the need for manpower by fully automating the muddy water management device in the above, and also simplifies the overall configuration and reduces the installation space by reducing the number of tanks or pumps It is an object of the present invention to provide a muddy water management device in the country. [0014] In order to achieve the above object, a muddy water management apparatus in the muddy water pressure shield method according to the present invention comprises a jet flow pipe having expanded pipe diameters at both ends of a throttle portion. A water supply port is connected to the upper end, and a decompression chamber is formed around the jet nozzle by approaching the tip of the jet nozzle communicating with the water supply port to the vicinity of the throttle portion. The water supplied from the water supply port and the sludge are formed by using a jet flow mixer having a plurality of projecting rods formed on an inner peripheral surface of a mixing pipe connected to a lower end of the jet flow pipe while communicating with a suction port. A muddy pressurized shield method in which the muddy water obtained by stirring with the mixing pipe while mixing with the powdery mud material sucked from the material suction port is supplied to an underground excavation hole;
Pumps up the water discharged from
While storing, the jet flow is placed above the muddy water adjustment tank.
-Provide a mixer and pump the muddy water in the muddy water adjusting tank with a pump.
Suction and feed to the water inlet of the jet flow mixer
And supplied by motor drive from silo
The powder mud is connected by a pipe via an air suction valve.
Suck it through the mud suction port of the jet flow mixer
The muddy water stirred by the mixing tube while mixing is
Discharge from the outlet of the flow mixer to the muddy water adjustment tank
The muddy water in the muddy water adjustment tank
By circulating again through the jet flow mixer
The muddy water in the muddy water adjusting tank to a predetermined concentration
It is characterized in that it is supplied to a drilled hole. Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an overall configuration diagram of a muddy water management device in a muddy water pressure shield method according to the present invention. FIG. 2 is an overall view of a jet flow mixer used in the present invention. In the following description, the same parts as those in FIG. 3 showing the conventional device are denoted by the same reference numerals. The jet flow mixer 1 used in the present embodiment is as described above.
As shown in the figure, the jet flow pipe 3 is formed to have an expanded pipe diameter on the outlet side and the inlet side of the throttle part 2, and the water supply port 4 is connected to the upper end thereof. The jet nozzle 5 built in the expansion section above the jet flow pipe 3 has an upper end connected to the water supply port 4 and a lower end extended to the vicinity of the throttle section 2 of the jet flow pipe 3. A decompression chamber 6 is formed on the outer periphery of 5. With such a decompression chamber 6, it is possible to obtain a jet ejector effect for generating a negative pressure around the vicinity of the entrance of the throttle portion 2 of the jet flow pipe 3, and to make a muddy material suction port 7 communicating with a side surface of the decompression chamber 6. The powder mud P (see FIG. 1) supplied through the hose 7a can be sucked into the jet flow pipe 3. Further, at the tip of the jet flow tube 3,
A mixing pipe 8 having a slightly larger diameter than the bulge on the outlet side of the jet flow pipe 3 is connected. A plurality of projecting rods 9 are formed on the inner wall surface of the mixing tube 8 in a state of being inclined in the direction of the discharge port 8a of the mixing tube 8 at intervals, thereby ensuring the water flow efficiency of the mixing tube 8 while maintaining the water flow efficiency. A Karman vortex is generated on the downstream side of the projecting rod 9. Due to the structure of the jet flow mixer 1, the powder mud P and mud water W flowing into the mixing pipe 8 are formed.
Is stirred by the above Karman vortex into a molten state,
The mixture is discharged from the discharge port 8a of the mixing tube 8. Next, the overall configuration of the muddy water management apparatus according to the present invention will be described. Referring to FIG. 2, a connection plate 13 is fixed to the connection portion between the water supply port 4 and the jet flow pipe 3 by screws in the jet flow mixer 1 described above. Then, as shown in FIG. 1, this connecting plate 13 is screw-fixed above the wall of the muddy water adjusting tank 14 installed on the ground, and the discharge port 8 a at the lower end of the mixing pipe 8 is directed into the muddy water adjusting tank 14. State. The excavation hole 20 being formed in the ground
A pump 23 is installed in the vicinity of the face 21 of the above, and spring water generated from underground near the face 21 or mud supplied from the mud water adjusting tank 14 is sucked up through the hose 23a through the hose 23a. The water filtered through the device 24 is supplied to the muddy water adjusting tank 14. Further, a pump 25 provided on the lower side surface of the muddy water adjusting tank 14 is connected to the water supply port 4 of the jet flow mixer 1 through a hose 25a, and the pump 25 sucks up the muddy water W in the muddy water adjusting tank 14. While being supplied to the water supply port 4 of the jet flow mixer 1 as described above, the powdery sludge P supplied from the sludge suction port 7 is mixed in the jet flow pipe 3 while being stirred by the mixing pipe 8. The discharged muddy water W is discharged from the discharge port 8a. As described above, the muddy water W in the muddy water adjusting tank 14 is circulated through the jet flow mixer 1, and the powdery mud material P is added to the jet flow mixer 1 and stirred, whereby the muddy water adjusting tank 14 is stirred. The concentration of the muddy water W stored therein gradually increases. On the other hand, in the vicinity of the muddy water adjusting tank 14, a silo 27 storing powdery mud material P is provided.
A transfer device 28 having a spiral blade 29 on its long axis is connected to the opening at the lower end of 7, and a motor 31 is connected to the rotating shaft 30 of the spiral blade 29. The spiral blade 29 is driven by the driving of the motor 31.
Rotates, the powdery mud material P in the silo 27 is sent upward by the transfer device 28, passes through the hose 7 a provided on the upper portion of the transfer device 28, and is formed by the jet flow mixer 1 to which the hose 7 a is connected. It is fed to the material inlet 7. An air suction valve 33 is connected in the middle of the hose 7a, mixes air into the powdery slurry P in the hose 7a, and mixes the air with the slurry suction port 7 of the jet flow mixer 1.
Enables suction to The motor 31 is connected to a concentration meter 35 provided in the muddy water adjusting tank 14 via a controller 34. The concentration of the muddy water in the muddy water adjusting tank 14 measured by the concentration meter 35 is set to an upper limit. Controller 3
4, the motor 31 is stopped, and the powder making material P from the silo 27 is no longer sent to the jet flow mixer 1. When the concentration reaches the set lower limit, the motor 31 is driven again and the powder from the silo 27 is discharged. The mud material P is supplied to the jet flow mixer 1. In such a configuration, the muddy water adjusting tank 1
By continuing to supply the powdery mud material P by driving the motor 31 until the muddy water concentration in the muddy water 4 reaches a predetermined value, the muddy water W in the muddy water adjusting tank 14 can be set to a predetermined concentration. As described above, according to the present invention,
A jet flow mixer is installed in the muddy water adjusting tank, and while the muddy water in the muddy water adjusting tank is supplied to the jet flow mixer cyclically, powdery mud material from the silo is automatically sucked and mixed with the mixing pipe of the jet flow mixer. Since the stirred muddy water is stored in the muddy water adjusting tank, the muddy water concentration in the muddy water adjusting tank can be determined by the supply amount of the powdery mud material fed from the silo. Therefore, by measuring the muddy water concentration in the muddy water adjusting tank and driving the motor to supply the powdery mud material until the muddy water concentration reaches the predetermined concentration, the muddy water of the predetermined concentration can be obtained. Along with the automatic supply of the powdery mud material from the silo by the motor, it is possible to obtain a muddy water management device in the muddy pressure shield method that is fully automated. Further, according to the present invention, only one muddy water regulation tank needs to be provided for the large tank provided on the ground.
It is also useful for reducing the installation space.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall configuration diagram of a muddy water management device in a muddy water pressure shield method according to the present invention. FIG. 2 is an overall view of a jet flow mixer used in a muddy water management device in the muddy water pressure shield method of the present invention. FIG. 3 is an overall configuration diagram of a muddy water management device in a conventional muddy water pressure shield method. [Explanation of Signs] 1 ... Jet flow mixer, 2 ... Throttle section, 3 ... Jet flow pipe, 4 ... Water supply port, 5 ... Jet nozzle, 6 ... Decompression chamber, 7 ... Slud material suction port, 7a ... Hose, 8 ... mixing pipe, 9 ... protruding rod, 11 ... muddy water adjusting tank, 12 ... pump, 1
3 ... connecting plate, 12a ... hose, 15a ... hose, 14 ...
Muddy water adjusting tank, 15 pump, 16 motor, 17 stirrer, 18 waste tank, 19 pump, 19a hose,
Reference numeral 20: excavation hole, 21: face, 23: pump, 23a: hose, 24: sand filter, 25: pump, 25a: hose, 27: silo, 28: transfer device, 28: spiral blade, 30 ... Rotating shaft, 31 ... motor, 33 ... air suction valve, 34 ... controller, 35 ... concentration meter, P ... powder making mud, W ... muddy water.

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) E21D 9/06 301 B01F 5/02 E02F 7/00

Claims (1)

(1) A water supply port is connected to an upper end of a jet flow pipe having an expanded pipe diameter at both ends of a throttle section, and the tip of a jet nozzle communicating with the water supply port is throttled. Forming a decompression chamber around the jet nozzle by approaching to the vicinity of the part,
The side wall of the decompression chamber communicates with the muddy material suction port, and the water supply port is formed by using a jet flow mixer having a plurality of protruding rods formed on an inner peripheral surface of a mixing pipe connected to a lower end of the jet flow pipe. Mud water obtained by mixing the water supplied from the slurry with the powdered mud material sucked from the mud material suction port while stirring with the mixing pipe to supply the mud water to an underground drilling hole. In the pressure shield method, the water discharged from the excavation hole is sucked up by a pump and mud
While the water is stored in the water adjustment tank,
A jet flow mixer is provided, and muddy water in the muddy water adjusting tank is provided.
Pump and pump the jet flow mixer.
The water is supplied to the water outlet, and the motor is driven from the silo
The supplied powdery mud is connected via a pipe via an air suction valve.
From the mud suction port of the jet flow mixer continued
Mud stirred by the mixing tube while being sucked and mixed
Water is supplied from the outlet of the jet flow mixer to the muddy water
Discharge to mud tank and suck up mud in mud adjusting tank with pump
Again to the jet flow mixer.
To make the muddy water in the muddy water adjusting tank a predetermined concentration.
And supply it to underground excavation holes.
Mud water management device in the mud pressurized shield method.