JP2000170480A - Mud discharge tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly supply charged mud into a suction pipe by installing a spiral conveyor used to stir and convey collected mud water in a tank. SOLUTION: Earth and sand and mud water dropped from a basket of a gravel separation device 1 move to the trough 3f side along an inclined face on a bottom of a mud tank 3 and are deposited sequentially from the inside of the trough 3f. Since a spiral conveyor 3b has a stirring action, it is driven to stir earth and sand and mud water in the mud tank 3 and measure viscosity by a viscometer 3d. When viscosity is high, mud water is supplied through a filler port 3e to adjust to proper viscosity. When mud water is discharged from the mud tank 3, the spiral conveyor 3b is driven to convey earth and sand in the mud tank 3 to the suction port 3a side and discharge it to the outside of a pit by a mud discharge pipe 5 connected to a suction port 3a. Consequently, it is possible to provide the spiral conveyor with two functions of stirring and conveying mud water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mud tank of a shield method.

[0002]

2. Description of the Related Art As a non-cutting method for constructing a tunnel in the ground, there is a shield method in which a tunnel is constructed while excavating underground by a cylindrical shield machine. A so-called semi-shield construction method in which a propulsion pipe is pushed in from behind a shield machine is known as a construction method particularly when a small-diameter tunnel is constructed. In the semi-shield method, since the diameter of the tunnel is small, it is an important issue how to efficiently discharge excavated earth in a narrow space.

[0003] As a conventional semi-shield method, there is, for example, one disclosed in Japanese Patent Application Laid-open No. Hei 7-269294, and Figs. It is a figure which shows a structure, FIG. 7 is a cross-sectional view, FIG. 8 is a longitudinal cross-sectional view. 7 and FIG.
Is a shield body which can be bent by a direction correcting jack 56, 52 is a cutter head provided at a front portion of the shield body 51, and a speed reducer 5 is driven by a cutter head driving motor 53.
4 through the rotary shaft 55.

[0004] The cutter head 52 is formed of spokes 52a having a substantially cross shape, and a plurality of cutters 5 are spaced apart in front of the spokes 52a in the radial direction.
2b are protruded, and the cutter 52b excavates a face in front of the reshielding body 51 and excavates a large diameter cobblestone.

A passage 55a is formed in the rotary shaft 55, and a front end of the passage 55a
a is communicated with the inside of a passage 52c formed in the inside a. The distal end of a passage 55a formed in the rotary shaft 55 and the distal end of a passage 52c provided in each spoke 52a are opened at the distal end of the rotary shaft 55 and the front surface of a cutter 52b attached to the spoke 52a. And a rotary shaft 5 through a rotary joint 57 from a slurry supply pipe (not shown).
The mud material supplied to the passage 55a in 5 is blown out into the excavated earth and sand from these openings.

On the other hand, the earth and sand taken into the chamber 51a is passed through a discharge pipe 60, an emergency pinch valve 61, a flexible pipe 62, and a service pinch valve 63, and a large diameter cobble is provided in the rear portion of the shield body 51. It is discharged to the separation means (trommel) 64.

The large-diameter cobblestone separating means 64 separates the large-diameter cobblestone mixed in the earth and sand from the earth and sand, and is formed of a cylindrical basket, and has a large number of vertical rods 64a arranged in parallel with the axis. And a spiral rod 64b spirally disposed in the circumferential direction.
The size of the eye between the vertical rod 64a and the spiral rod 64b is set so that a large diameter boulder of a predetermined size cannot pass through, and the large diameter boulder separating means 6 is separated from the earth and sand.
The large-diameter cobblestone remaining in 4 is transported backward by a different route from earth and sand by transport means (not shown).

On the other hand, below the large-diameter boulder separating means 64, there is provided a hopper 66 into which the sediment separated from the large-diameter boulder by the large-diameter boulder separating means 64 falls. The hopper 66 has an upper surface opened and a part of the bottom 66a is an inclined surface 66c which is greatly inclined toward the suction port 66b, so that the earth and sand dropped from the opening easily flows toward the suction port 66b. An earth and sand pump is connected to the suction port 66b via a suction pipe 67 and a ball joint (not shown).

The operation of the prior art constructed as described above will be described. The earth and sand excavated by the cutter head 52 in accordance with the propulsion of the shield body 51 flows by the slurry material ejected from the passage 52c in the spoke 52a. After being made into muddy soil and taken into the chamber 51a, it is sent from the discharging pipe 60 to the large-diameter cobblestone separating means 64 through the emergency pinch valve 61 and the regular pinch valve 63, and the large-diameter cobblestone separating means 64 is used to remove large amounts of sediment. Cobblestone is separated. The separated large-diameter cobblestone is conveyed backward through another path (not shown), and the sediment that has passed through the large-diameter cobblestone separation means falls into the hopper 66 and is sucked by the inclined surface 66c at the bottom of the hopper 66. Mouth 66
Guided to the b side.

The state of separation of the large-diameter boulder by the large-diameter boulder separating means 64 and the state of the hopper 66 are determined by the shield body 5.
Surveillance means 7 consisting of a television camera installed on top of 1
5 is constantly monitored, and an image captured by the monitoring means is sent to an operation panel (not shown) and displayed on a monitor. If a malfunction occurs in the large-diameter boulder separating means 64 or the hopper 66, the operation of the earth and sand pump is immediately stopped to prevent the earth and sand pump from being damaged. In addition, it is possible to control the discharging of the soil by observing the flow state of the discharging soil.

As described above, the hopper 66 plays an important role as a device at a stage before the mud is discharged by the earth and sand pressure pump in the conventional mud discharging device.

[0012]

However, in the above-described hopper 66 (drainage tank) of the conventional drainage device, a part of the bottom portion 66a has an inclined surface 66c which is greatly inclined toward the suction port 66b. Although it is considered that the sludge dropped from the opening easily flows to the suction port 66b side, the sludge gradually accumulates on the bottom 66a and the inclined surface 66c, and the internal volume of the hopper 66 decreases, and It is conceivable that the sludge does not easily flow to the suction port 66b. And, if left as it is, there is a problem that the supply of the sludge to the suction pipe 67 cannot be performed, and the function as the sludge discharging device does not function.

Further, in the sludge conveyance by the suction pipe 67, the viscosity of the sludge affects the sludge efficiency, but since there is no means for directly adjusting the viscosity of the sludge, the sludge material supplied to the front of the cutter 52b is not provided. By adjusting the viscosity of the wastewater, only the viscosity of the wastewater can be indirectly adjusted, and there is a problem that the efficiency of the wastewater cannot be increased.

The present invention has been made in order to solve such a problem, and an object of the present invention is to obtain a sludge tank capable of smoothly supplying the sludge to the suction pipe. It is another object of the present invention to obtain a sludge tank capable of adjusting the viscosity of the sludge.

[0015]

SUMMARY OF THE INVENTION A sludge tank according to the present invention is used in a sludge discharging apparatus for carrying out excavated soil taken into a chamber of a shield machine together with muddy water sent to a cutting face. In addition, a spiral conveyor used for stirring and transporting the stored muddy water is installed in a tank.

Further, the shape is made to be a ship bottom, and a spiral conveyor is arranged at the bottom.

Further, the depth of the trough of the spiral conveyor is set based on the internal volume of the sludge tank and the transport amount of the spiral conveyor.

Further, side plates capable of forming a side wall of the trough together with the both side walls are installed above the upper ends of both side walls of the trough of the spiral conveyor so as to be vertically movable.

Further, in the sludge tank of the sludge discharging device for carrying out the excavated soil taken into the chamber of the shield machine together with the muddy water sent to the face, the viscosity of the mud in the sludge tank is adjusted by the face. Mud water sent is used.

[0020] In addition, in the sludge tank of the sludge discharging device which carries out the excavated soil taken into the chamber of the shield machine together with the muddy water sent to the face, a material having low adhesion and wettability is coated on the inner surface. It was done.

Further, the material of the coating is any one of polyethylene, Teflon and urethane elastomer.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is an explanatory diagram of a sludge discharging device including a sludge discharging tank according to an embodiment of the present invention. As shown in FIG. 1, the sludge discharging device is constituted by a plurality of devices installed inside the propulsion pipe 2. First, the overall configuration of the sludge discharging device will be outlined based on FIG. 1. In FIG. 1, 63a is a mud outlet following the pinch valve 63 for discharging the excavated soil taken into the chamber 51a of the shield main body 51 (for the chamber 51a of the shield main body 51, FIG.
1 is a gravel separator having a function of crushing clay in addition to the function of separating large-diameter boulders and earth and sand, and 3 is a sediment that is installed below the gravel separator 1 and has a large-diameter boulder removed. And a sludge tank 5 for storing muddy water is a sludge drainage pipe for piping and transporting the sediment and muddy water stored in the sludge discharge tank 3.

As a method of transporting the pipes, for example, there is a method in which compressed air is supplied from the upstream side, or a method in which suction is performed from the downstream side by a vacuum pump. Reference numeral 7 denotes a hopper that is installed on the exit side of the gravel separator 1 and supplies a large-diameter boulder discharged from the gravel separator 1 to a belt conveyor 9 described below.
Is a belt conveyor that conveys large-diameter boulders supplied from the hopper 7 to the gravel tank 11, 13 is a self-propelled gravel discharge cart that carries the gravel tank 11 and carries it out of the mine, 15 is a gravel discharge cart 1
Reference numeral 3 denotes a traveling rail for traveling.

Reference numeral 17 denotes a television camera for monitoring the sludge discharging device, which is installed near the gravel separating device 1 and at the exit side of the belt conveyor 9, respectively. Reference numeral 19 denotes a control panel of the sludge discharging device and the television camera. The control panel 19, the TV camera 17, a microphone (not shown), a ground-side control panel, a monitor, a microphone, and the like constitute a monitoring system of the sludge discharging device. I have.

Next, the details of the sludge tank 3 constituting a part of the sludge discharging apparatus will be described. Fig. 2 shows the sludge tank 3
2 (a) is a front view, FIG. 2 (b) is a plan view, FIG. 2 (c) is a side view, and FIG. 3 is an arrow A in FIG. 2 (a).
It is -A sectional drawing. The sludge discharge tank 3 has a rectangular planar shape, and is formed in an arc shape such that the side wall on the front side in the figure is along the side wall of the propulsion pipe 2. As shown in FIG. 3, the cross-sectional shape is a ship bottom, and a trough 3f is provided at the bottom.
Are formed. A suction port 3a for discharging muddy water is provided on one side surface continuous with the trough 3f, and a spiral conveyor 3b having one end facing the suction port 3a is provided on the trough 3f. It is installed over both ends in the direction.

Here, the trough 3 of the spiral conveyor 3b
A method for determining the depth of f will be described. The transport amount of the spiral conveyor 3b is expressed by the following equation (1). Q = n · η · A · P (1) Here, Q: transport amount of spiral conveyor n: number of revolutions of spiral conveyor η: filling rate of transfer target in trough A: transport area of spiral P : Spiral pitch

As can be seen from the above equation (1), if the transport amount Q of the spiral conveyor 3b is constant, the rotation speed n, the spiral transport area A and the pitch P are constant, the transport object filling rate η in the trough, That is, it is determined by the depth H of the trough 3f, and the carry amount Q and the depth H of the trough 3f are in a proportional relationship. Therefore, when the outer diameter of the spiral is maximized and the depth H of the trough 3f is large, the transport amount Q of the spiral conveyor 3b is large, and when the depth H of the trough 3f is small, the transport amount Q of the spiral conveyor 3b is small. . Therefore, in order to increase the transport amount Q of the spiral conveyor 3b, the depth H of the trough 3f may be increased.

However, in the narrow space of the propulsion pipe in the shield method, there are certain restrictions on the dimensions of the equipment installed therein, and of course there are also certain restrictions on the size of the sludge tank 3. The dimension B in the height direction of the sludge tank 3 is generally limited. To increase the depth H of the trough 3f while keeping the height of the sludge tank 3 constant, see FIG. As shown in FIG. 4, the depth C of the sludge tank 3 must be reduced. When the depth C of the sludge tank 3 is reduced, the internal volume V is reduced. That is, trough 3f
Is substantially inversely proportional to the inner volume V of the sludge tank 3.

On the other hand, the internal volume V of the sludge tank 3 is determined by the relationship between the amount of sludge dropped from the trommel 1 and the amount discharged from the sludge tank 3 by pipe transportation. Assuming that the amount of sludge discharged from the tank is substantially constant, the inner volume V of the sludge tank 3 may be smaller as the amount discharged by pipe transportation is larger. The amount discharged by pipe transportation is considered to be proportional to the transport amount Q of the spiral conveyor 3b. Therefore, the internal volume V of the sludge tank 3 is substantially inversely proportional to the transport amount Q of the spiral conveyor 3b.

In short, the transport amount Q of the spiral conveyor 3b is proportional to the depth H of the trough 3f, and the depth H of the trough 3f is substantially inversely proportional to the inner volume V of the sludge tank 3. And the internal volume V of the sludge tank 3
And the transport amount Q of the spiral conveyor 3b can be said to be substantially in inverse proportion. FIG. 5 shows these relationships in a graph. Therefore, the depth H of the trough 3f
Is the internal volume V of the sludge tank and the spiral conveyor 3b
The optimal value is set in consideration of the relationship with the carry amount Q.

Another configuration of the sludge tank 3 will be described with reference to FIG. 2 again. The sludge tank 3 is provided with a level meter 3c for measuring the level of the mud, a viscosity meter 3d for measuring the viscosity of the mud, and an inlet 3e for injecting the mud for adjusting the viscosity of the mud in the sludge tank 3. Have been. Inlet 3e
Is branched from a mud pipe (not shown) for supplying mud to the front end of the shield body, and a part of mud used for shield excavation is supplied to the sludge tank 3 from the inlet 3e for viscosity adjustment. . As a method of adjusting the viscosity, for example, the viscosity is monitored by a viscometer 3d, and when the viscosity becomes larger than a preset value, the valve of the inlet 3e is opened and a part of the muddy water is supplied to the sludge tank 3. I do.

The sludge tank 3 is coated on its inner surface with a material having low adhesion and wettability, such as polyethylene, Teflon, and urethane elastomer. As a result, the discharged soil from the trommel 1 is less likely to adhere to the inner surface of the sludge tank 3 with mud and clay, and flows smoothly to the trough 3f. Incidentally, polyethylene, Teflon, urethane elastomer and the like are coated with a necessary film thickness in consideration of abrasion and damage caused by small pebbles and earth and sand passing through the basket of the trommel 1.

The operation of the sludge tank 3 configured as described above will be described. The earth and sand and muddy water that have fallen from the basket of the gravel separating device 1 move to the trough 3f side along the inclined surface at the bottom of the sludge discharge tank 3 and are sequentially deposited from inside the trough 3f. Since the spiral conveyor 3b has a stirring action, the spiral conveyor 3b is driven to stir the soil and mud in the sludge tank 3, and the viscosity is measured by a viscometer 3d. To adjust the viscosity to an appropriate level.

When discharging muddy water from the sludge tank 3,
The spiral conveyor 3b is driven to convey the earth and sand in the sludge tank 3 to the suction port 3a side, transported by piping through a sludge pipe 5 connected to the suction port 3a, and discharged out of the pit.
At this time, the bottom of the sludge tank 3 is inclined in the shape of a ship bottom, and is coated with a material having low adhesion and wettability such as polyethylene, Teflon, and urethane elastomer. As it moves, the earth and sand smoothly slides down on the spiral conveyor 3b along the inclined surface, and the earth and sand does not remain on a part of the bottom of the sludge discharge tank 3.

As described above, according to the present embodiment, the sludge in the sludge tank 3 is efficiently supplied to the sludge pipe while maintaining the optimum viscosity, and discharged to the outside of the pit by pipe transportation. Become.

Embodiment 2 FIG. 6 is an explanatory diagram of another embodiment of the present invention, and corresponds to FIG. 3 in the first embodiment. In the present embodiment, the side plates 3g are installed on both sides of the trough 3f so as to be movable in the vertical direction, and the depth of the trough is made variable. The side plate 3g is provided along the trough 3f above the upper ends of both side walls of the trough 3f. By providing the movable side plate 3g in this way, when driving the spiral conveyor 3b, the side plate 3g is driven.
By moving g downward to form a part of the trough, the trough becomes deeper and the transport amount Q of the spiral conveyor 3b can be increased.

According to the present embodiment, it is possible to achieve the same state as the depth of the trough without changing the depth of the sludge tank 3. Therefore, the inner volume V of the sludge tank and the transport amount Q of the spiral conveyor can be individually determined, and both the inner volume V of the sludge tank and the transport amount Q of the spiral conveyor 3b can be secured.

In the first and second embodiments, the semi-shield method has been described as an example. However, it is needless to say that the present invention is not limited to this and can be applied to a general shield method. .

[0039]

Since the present invention is configured as described above, it has the following effects.

A spiral conveyor used for stirring and transporting the stored mud water in a mud discharge tank of a mud discharging device for carrying out the excavated soil taken into the chamber of the shield machine together with the mud water sent to the face to the outside of the pit. The spiral conveyor can be provided with two functions of agitation and transport of muddy water by being installed inside, so that the apparatus can be simplified and space can be saved.

In addition, since the shape is formed in the bottom of the ship and the spiral conveyor is arranged at the bottom, the sludge can be collected on the spiral conveyor without any special mechanism.

Furthermore, since the depth of the trough of the spiral conveyor is set based on the internal volume of the sludge tank and the transport amount of the spiral conveyor, an optimum internal volume and transport amount can be secured.

Further, since the side plate capable of forming the side wall of the trough together with the both side walls is installed above the upper end of the both side walls of the trough of the spiral conveyor so as to be vertically movable, the inner volume of the sludge discharge tank and the transport amount of the spiral conveyor are provided. Can be determined individually, and both the inner volume of the sludge tank and the transport amount of the spiral conveyor can be secured.

Further, since the muddy water sent to the face is used for adjusting the viscosity of the muddy water in the sludge tank, the viscosity of the muddy water can be adjusted without special equipment, and the efficiency of the sludge transfer is improved. be able to.

Further, since the inner surface is coated with a material having low adhesion and wettability such as polyethylene, Teflon, and urethane elastomer, the sludge falls to the bottom without adhering to the inner surface of the sludge tank or accumulating. As a result, the inner volume of the sludge tank can be prevented from decreasing, and the flow of the sludge can be made smooth.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a sludge discharging apparatus according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a sludge tank according to one embodiment of the present invention.

FIG. 3 is a sectional view taken along the line AA in FIG. 2 (a).

FIG. 4 is an explanatory diagram illustrating the relationship between the inner volume of the sludge tank and the depth of the trough according to the embodiment of the present invention.

FIG. 5 is a diagram showing the relationship between the internal volume of the sludge tank, the conveyed amount of the spiral conveyor, and the depth of the trough according to the embodiment of the present invention.

FIG. 6 is an explanatory view of a trough of a spiral conveyor according to another embodiment of the present invention.

FIG. 7 is a cross-sectional view showing a conventional earth-and-sand transporting device of a soil-sealing semi-shield excavator.

FIG. 8 is a vertical cross-sectional view showing a conventional earth and sand transport device of a soil excavation type semi-shield excavator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gravel separator 3 Sludge tank 3a Suction port 3b Spiral conveyor 3c Level meter 3d Viscometer 3e Inlet 3f Trough 3g Side plate 5 Drain pipe

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroyuki Unishi 1-1-2 Marunouchi, Chiyoda-ku, Tokyo Inside Nihon Kokan Co., Ltd. (72) Inventor Takahiro Shimamura 1-1-2 Marunouchi, Chiyoda-ku, Tokyo F-term (reference) in Nippon Kokan Co., Ltd. 2D054 AC05 AC18 DA12 DA35 DA39

Claims (7)

[Claims] 1. A spiral conveyor for stirring and transporting stored mud water in a mud discharge tank of a mud discharging device for carrying out the excavated soil taken into the chamber of the shield machine together with the mud water sent to the cutting face to the outside of the pit. The sludge tank is characterized by having installed in the tank. 2. The shape of a ship is bottomed, and a spiral conveyor is arranged at the bottom of the ship.
The described sludge tank. 3. The exhaust system according to claim 1, wherein the depth of the trough of the spiral conveyor is set based on the internal volume of the sludge tank and the transport amount of the spiral conveyor. Mud tank. 4. The sludge according to claim 1, wherein a side plate capable of forming a side wall of the trough together with the both side walls is installed above an upper end of both side walls of the trough of the spiral conveyor so as to be vertically movable. tank. 5. A sludge tank of a sludge discharging device for carrying out excavated soil taken into a chamber of a shield machine together with mud water sent to a cutting face, to adjust viscosity of mud in the sludge discharging tank. A sludge tank characterized by using mud sent. 6. A sludge tank of a sludge discharger for transferring excavated soil taken into a chamber of a shield machine together with muddy water sent to a cutting face to an outside of a pit, wherein a material having low adhesion and wettability is coated on an inner surface. A sludge tank characterized by the following. 7. The sludge tank according to claim 6, wherein the material of the coating is any one of polyethylene, Teflon, and urethane elastomer.