JPS5814554B2 - Drainage method and shear separator in muddy water shield method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a drainage method using a mud water shield method in which shear is separated and discharged from mud water discharged from a mud water shield excavation machine in a mine, and pressure control of pressurized water to a face is easily and accurately maintained. and the shear separator used therein.

Conventional mud water shield machines are equipped with a bulkhead on the shield excavator, and a water pump is used to supply pressurized water from a mud and sedimentation tank installed on the ground between the face and the bulkhead. Sludge water containing shear is pumped to the mud pump. The sludge and mud are separated and circulated during excavation, but the sludge water discharged from the shield excavator into the settling tank above ground is in the form of a slurry containing shear. It is necessary to ensure a flow rate per unit time that prevents shear from settling and accumulating in the sludge pipe, and it is necessary to equip a sludge pump with a large driving force.Moreover, the sludge pipe is elongated as the tunnel is dug. Accordingly, it is necessary to install additional sludge pumps.

Furthermore, since the concentration and discharge volume of wastewater are not uniform, it is difficult to control the pressure at the face, and the muddy water treatment equipment for separating and discharging shear from wastewater is large and takes up a lot of space in urban areas. There was a problem.

In view of the above-mentioned circumstances, the present invention was devised in order to eliminate the drawbacks.The present invention separates waste water into sludge and water in a mine, and drains the sludge into the mine while draining it. death,
Separated water is circulated and supplied as pressurized water to the working face in a state in which it contains almost no shear, and since the shear has been separated, the drainage flow rate is reduced, which not only makes it possible to easily and accurately maintain pressure control of the pressurized water pressure to the working face. Supply muddy water to the separated water in a small amount to compensate for lost water to the ground.
The purpose of the present invention is to provide a mud water shield machine that can make a water supply mud water plant installed on the ground more compact.

The configuration of the muddy water shielding machine according to the present invention will be described with reference to the embodiment shown in the drawings. First, it is a general muddy water shielding machine, and 1 is a shield excavator of the muddy water shielding machine,
The shield excavator 1 has a cutter head 3 rotatably installed at the front of a skin plate 2 via a bulkhead 4, and a shield jack 5 at the rear of the skin plate 2.
, 5, ... are interposed between the peripheral end surface of the bulkhead 4 and the front segment S1 of the segments S, S, ... forming the tunnel 6, and the shield jacks 5, 5, ... are extended. After excavating the face a certain distance by the propulsive action of the skin plate 2 and the rotational action of the cutter head 3, the shield jacks 5, 5, ... are retracted with the front fixed, and the erector ( (not shown) to assemble a new segment (not shown) to the front segment S, and again perform the digging operation of the skin plate 2 and cutter head 3.
The excavation face is sequentially excavated by the rotational operation of the excavator.

In the muddy water shield construction method using the shield excavator 1, a water supply pipe with a water supply pump 8 interposed from a water supply tank 7 installed on the ground is installed at the top of the underground side of the bulkhead 4 of the shield excavation machine 1. 9 is connected to supply pressurized water to the face to the front of the bulkhead 4 to prevent the face from collapsing.In addition, a drain pipe 25 is taken out from the bottom of the inside of the bulkhead 4 to drain mud. The mud wastewater is circulated through a pump 26 to a sedimentation tank (also serving as a water supply tank) 7 outside the mine, where the shear in the wastewater is separated by sedimentation.

Here, in the present invention, a sedimentation separation tank 10 of one tank is provided in communication with the take-out portion of the sludge pipe 25 at the bottom of the underground side of the bulkhead 4.

That is, the separation tank 10 is formed into a watertight and airtight tank consisting of a storage part and a cylindrical part which are constructed in an inclined manner from the bottom of the bulkhead 4 toward the top of the tail seal 2a, and the upper end of the upper surface 10a of the cylindrical part is has compressed air supply nozzle 1
1 is disposed via an automatic pressure regulating valve 14 from an air receiver 13 communicating with an air compressor 12 installed in the mine, and a float switch 1 is disposed in the middle of the upper surface 10a.
A water level detection tube 16 is installed, which is connected to compressed air by a branch pipe from the air supply nozzle 11, and the waste water introduced into the sedimentation separation tank 10 is connected to the float switch 15 of the water level detection tube 16. The automatic pressure regulating valve 14 operated by the automatic pressure regulating valve 14 synchronizes with the face pressurizing water pressure and supplies air from the air supply nozzle 11 into the sedimentation separation tank 10 so that the water level is stored at a constant level a. The lower end of the bottom surface 10b of the separation tank 10 protrudes into the muddy water chamber S and is bent along the inner edges of the shearing blades 3a, 3at, etc., which protrude radially from the peripheral edge of the rear surface of the cutter head 3. A classification sedimentation section 10c is formed for the fine powder and the fine powder.

Reference numeral 17 designates the main body of the sedimentation separation tank 10 as a casing, and collects the sedimented sludge on the bottom surface 10b of the sedimentation tank 10 as a wastewater storage a.
A lifting conveyance mechanism for conveying from the side to the air-filled b side,
The screw conveyor 18 forming the transport body of the lifting transport mechanism 17 is rotatably mounted between the top surface 10d of the sedimentation separation tank 10 and the shear classification settling section 10c, and is provided on the top surface 10d side of the screw conveyor 18. It is driven by a hydraulic motor 19.

Note that it is preferable that the vanes of the conveying screw 18 of the screw conveyor 18 be perforated plates to provide a rake effect for separating shear and draining water.

Further, as the lifting and conveying mechanism 17, it is also possible to use other types of conveyors such as a ribbed belt conveyor.

Furthermore, an earth removal mechanism 20 is provided at the transfer end side of the lifting and conveying mechanism 17 so as to maintain a pressurized air lock in the sedimentation separation tank 10.

That is, 21 is a rotary feeder of the earth removal mechanism 20, and the rotary feeder 21 is rotatably supported in a feeder casing 23 that projects from the bottom surface 10b through an opening 22. The soil removal blades 21a, 21a, . . . of the rotary feeder 21 are attached to the feeder casing 23.
The air lock of the sedimentation separation tank 10 is maintained by closely sliding and rotating the inner surface, and the shear discharged from between the conveying screws 18' of the screw conveyor 18 into the feeder casing 23 through the opening 22 is removed section by section. The soil is discharged into the mine through the discharge port 24.

Reference numeral 25 denotes a drain pipe connected to the sludge storage a side of the sedimentation separation tank 10, and the drain pipe 25 separates the sludge from the sludge by a drainage pump 26 to the water supply installed on the ground. Water is drained into a water tank 7, and in conjunction with the sediment cleaning action of the water supply tank 7, water is circulated and supplied to the face via a water pipe 9.

Reference numeral 27 denotes a mine car that runs on a track 28 laid in the mine, and the mine car 27 transports the shear discharged from the earth removal mechanism 22 toward the vertical shaft connecting the mine shaft 6 with the surface. It is something.

FIG. 3 shows a structure in which the sedimentation separation tank 10 is installed separately from the bulkhead 4 and connected to the inside of the mine in a sealed manner via a mud drain pipe 29, slanting from the bottom to the top of the tunnel 6. In this case, the slurry is stirred by an agitator (not shown) installed in the bulkhead 4, and the slurry water is transferred to the sedimentation separation tank 10 through the drainage pipe 29, and is then transferred to the shear classification sedimentation section 10c. This is particularly useful when the shield is relatively small in diameter and it is not possible to incorporate the sedimentation tank 10 into the shield machine as shown in FIG.

FIG. 4 shows still another embodiment, in which the drain pipe 25 is connected directly to the water pipe 9 via a drain pump 26.

In this example, the water separated from the slurry water is circulated and used without going through the water supply tank 7 installed on the ground, and the water supply pump 8 only needs to replenish the lost water into the ground. The amount of water used can be significantly reduced.
Even if they communicate in a sealed manner through a sludge drain pipe 29, as shown in FIGS. 1 and 2, it is not necessary to intervene.

Next, the operation of the present invention will be explained.

Now, if mud water is supplied from the water supply pipe 9 by the water supply pump 8 with the composition and pressure suitable for the face, the sedimentation separation tank 10
On the side where the compressed air is sealed, a float switch 15 of the water level detection tube 16 causes compression synchronized with the face pressure water pressure from the air supply nozzle 11 so as to maintain the amount of water stored between the lower detection water level and the upper detection water level. After the air is supplied and the air pressure is used to store pressurized water at a constant level on the sludge water storage a side of the sedimentation separation tank 10, and the front surface of the bulkhead 4 is filled, the drain pump 26 is driven and sent to the face. Circulating water is supplied, the shield tunneling machine 1 excavates the face by rotating the cutter head 3 and propelling the skin plate 2, and the tunnel 6 is moved forward while sequentially assembling new segments S using an erector (not shown).

In this case, the shear generated by the excavation of the shield excavator 1 flows between the rear surface of the cutter head 3 and the front surface of the bulkhead 4 from the shear inflow passage (not shown) of the cutter head 3, and the shear is removed by the shear scraping blades 3a, 3a. , . . . Still, the waste mud water is stirred with pressurized mud water by an agitator (not shown) and introduced into the waste mud storage a side of the sedimentation separation tank 10,
The sludge water introduced into the sludge storage a side is sent to the sedimentation separation tank 1.
The shear in the waste mud water is deposited on the bottom surface 10b of the sedimentation separation tank 10 due to the stagnation action in the sludge, and the precipitated shear is transferred to the bottom surface 10b of the casing by the screw conveyor 18 of the lifting conveyance mechanism 17. The soil is transported to the side, and in the process of passing through the air enclosure b side, it is discharged into the mine from the soil unloading mechanism 20 while being subjected to a draining action, transferred to the mining car 27, and discharged to the ground from the shaft for connection to the surface, Further, the water separated from the shear of the waste mud water is drained from the drain pipe 25 by the drain pump 26 so as to be circulated and supplied to the face.

As a result, the separated water flowing back through the drain pipe 25 contains almost no shear other than fine particles, so the flow rate per unit time only needs to be small, and the driving power of the water supply pump 8 and the drain pump 26 is can be made small depending on the softness of the face and the groundwater level.

Moreover, since the circulating mud always has uniformity in concentration and discharge amount, the pressure of pressurized water to the face can be easily and precisely maintained.

Moreover, since the pressure fluctuation of the pressurized water to the face is affected by the air pressure supplied to the sedimentation separation tank 10, it can be controlled quickly, accurately, and easily.

As is clear from the above structure and operation, the present invention separates waste water into shear and water in a mine, drains the shear into the mine while draining it, and leaves the separated water in a state that contains almost no shear. By circulating water as pressurized water to the working face and reducing the drainage flow rate, it is possible to easily and accurately maintain the pressure control of the pressurized water to the working face. It is possible to reduce the amount of water to a level that is small enough to cover water, and it also has extremely useful new effects such as making it possible to make a water supply slurry plant installed on the ground more compact.

[Brief explanation of drawings]

The drawings show an embodiment of the muddy water shielding machine according to the present invention, in which Fig. 1 is an overall longitudinal sectional view, Fig. 2 is an enlarged longitudinal sectional view of the main parts, and Fig. 3 is an enlarged longitudinal sectional view of the main parts. FIG. 4 is an overall vertical sectional view showing another example of the piping condition of the drain pipe. In the figure, 1 is a shield excavator, 2 is a skin plate, 3 is a cutter head, 4 is a bulkhead, 7 is a water supply sedimentation tank, 8
is a water pump, 9 is a water pipe, 10 is a sedimentation separation tank, 1
1 is an air supply nozzle, 13 is an air receiver, 14 is an automatic pressure regulating valve, 16 is a water level detection tube, 17 is a lifting conveyance mechanism, 20 is an earth discharge mechanism, 25 is a drain pipe, and 26 is a drain pump.

Claims (1)

[Scope of Claims] 1. A drainage method in the muddy water shield construction method in which muddy water is sent between the bulkhead and face of a shield excavator, and drilling sludge and muddy water are discharged from the inside of the bulkhead to the outside of the mine and circulated. A shear separation tank is installed on the underground side of the bulkhead in communication with the drainage pipe, and an air chamber is installed in the upper part of the tank using air pressure corresponding to the mud water pressure, and a lift conveyance mechanism is installed in the separation tank to remove slip in the mud water. A drainage method in the muddy water shield method, characterized in that muddy water is moved from muddy water to an air chamber, separated, and discharged outside the tank, so that mainly only muddy water is circulated. 2. In a shield excavator used in the muddy water shield method, a shear separation tank consisting of a storage part and a cylindrical part is provided on the underground side of the bulkhead in communication with the muddy water discharge pipe, and the cylindrical part is cased in the separation tank. A shear separation device for the muddy water shield construction method, which is characterized by having a lifting and conveying mechanism installed therein, as well as a water level detection device and a pressure device.