JP3524593B2 - Mud water treatment equipment for tunnel excavator - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a muddy water treatment device for a tunnel excavator used in a tunnel construction work. 2. Description of the Related Art FIG. 4 schematically shows a tunnel excavator used for tunnel construction and a conventional muddy water treatment facility, and FIG. 5 is a processing block diagram showing a concrete muddy water treatment method by the muddy water treatment equipment. FIG. 6 schematically shows a tunnel excavator used for tunnel construction and another conventional muddy water treatment facility. As shown in FIG. 4, at a tunnel construction site, a shield excavator 11 moves forward while excavating the ground in front by a cutter head mounted on a front end portion, and assembles segments on the inner wall surface of a drill hole. Tunnel 1
Build 2. The excavated sediment generated during this tunnel excavation is taken into the muddy water chamber 13, muddy water is fed from a mud pipe 14, and the excavated sediment and muddy water are agitated and mixed by an agitator 15, and the muddy water is discharged to the outside by a mud drain pipe 16. It is being discharged. On the other hand, a muddy water treatment facility 18 is provided on the ground portion adjacent to a centralized control room 17 for tunnel construction, and separates excavated earth and sand conveyed by a drain pipe 16 into earth and sand and moisture. [0004] That is, as shown in FIG.
In 8, the excavated earth and sand conveyed by the mud pipe 16
It is discharged to the vibrating sieve 21, where the sand is sieved, and discharged to the sand pit 23 by the belt conveyor 22. The muddy water that has passed through the vibrating sieve 21 is stored in a muddy water receiving tank 24 and then put into a liquid cyclone 26 by a pump 25. Here, the muddy water is separated, and the particle components are returned to the vibrating sieve 21, while the other muddy water is guided to the adjusting tank 27. The muddy water that overflows the adjusting tank 27 is guided to an excess muddy water tank 28, and further guided to a filter press 29 to sort silt. On the other hand, the muddy water in the adjusting tank 27 is returned to the muddy water chamber 13 of the shield excavator 11 through the mud feeding pipe 14 by the mud feeding pump 30. Although not described, the muddy water treatment equipment 1
The apparatus 8 is also provided with a device for adjusting the specific gravity of muddy water and the pH. [0005] In the tunnel construction using the shield excavator 11 and the muddy water treatment equipment 18 described above, the muddy water treatment equipment 18 is installed above the ground.
Its occupied space is large and its period is long. Therefore, there is a demand that the occupied space in the ground portion such as the muddy water treatment equipment 18 be small and the occupation period be short. In response to such a demand, in a large-section tunnel construction, as shown in FIG.
Is installed in the tunnel 12. However, the muddy water treatment equipment 18 is connected to the tunnel 1
By merely applying a water pressure that balances the surrounding groundwater pressure to the face while being installed in the inside of the tunnel 2, muddy water spouts at the face of the muddy water treatment facility 18 due to the natural head H at the outlet of the mud pipe 16, and the tunnel 12 The pressure may drop to the inside pressure, making it difficult to control the pressure at the face, and causing a problem such as collapse or collapse of the peripheral wall surface at the face. Therefore, it is conceivable to provide an orifice, a gate, or the like at the outlet portion of the sludge pipe 16 so as to prevent the pressure drop by narrowing the discharge port. There is a problem that the muddy water cannot be discharged due to blockage. Also,
The shield excavator 11 needs to circulate a constant flow of mud to excavate at a constant speed in accordance with the ground conditions to be excavated. However, when the excavation depth or the groundwater pressure at the face changes, the flow of the mud increases. It fluctuates with it. The present invention has been made to solve such a problem, and provides a muddy water treatment apparatus for a tunnel excavator capable of discharging a constant amount of muddy water while maintaining a constant pressure with a simple structure. The purpose is to do. [0008] In order to achieve the above object, a muddy water treatment apparatus for a tunnel excavator according to the first aspect of the present invention.
Discharges excavated soil generated by ground excavation as muddy water
To be treated by a muddy water treatment facility through a fluid pressure reducing device.
A muddy water treatment device for a flannel excavator, wherein the fluid decompression device
The lower top a large diameter at the top of the main body which forms a hollow cone has a smaller diameter, along the outer circumference tangential direction of the body mud
A fluid inflow path into which water flows is formed, and a control fluid inflow path is formed along a direction intersecting with muddy water flowing into the inside of the main body from the fluid inflow path, while an axial center is formed in a lower portion of the main body. A fluid outflow passage for discharging muddy water is formed along the direction, and the control corresponding to the fluctuation of the face pressure is performed.
The inflow of fluid into the body causes the fluid
The ability to maintain a constant flow rate of flowing muddy water
It is characterized by the following. The muddy water generated by excavating the ground is supplied to a fluid pressure reducing device.
The fluid flows in from the fluid inflow channel, and descends as a vortex along the inner wall surface of the main body while controlling the inflow amount and the inflow direction by the control fluid flowing in from the control fluid inflow channel, and flows out from the fluid outflow channel in the lower portion of the main body. Is done. At this time, by adjusting the amount of the control fluid flowing into the main body from the control fluid inflow passage, a constant outflow amount is maintained when the pressure of the muddy water immediately before flowing into the main body flows out from the fluid outflow passage. It is possible to control to reduce the pressure to a predetermined pressure. Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic diagram showing a fluid pressure reducing device according to an embodiment of the present invention, FIG. 2 is a schematic plan view showing the fluid pressure reducing device, and FIG. 3 is a shield excavator equipped with the fluid pressure reducing device of this embodiment. 1 schematically shows a muddy water treatment apparatus. Members having the same functions as those described in the related art are denoted by the same reference numerals, and redundant description will be omitted. In the embodiment described below, a case will be described in which the fluid pressure reducing device of the present invention is mounted on a muddy water treatment device of a tunnel excavator. As shown in FIG. 3, in the shield excavator 11, a cutter head 32 is rotatably mounted in front of a skin plate 31 having a cylindrical shape. Carbide tooth cutter bit 3
3 is fixed. A bulkhead 34 is fixed to the skin plate 31 at the rear of the cutter head 33,
The muddy water chamber 13 is formed between the cutter head 33 and the bulk head 34. Accordingly, when a drive motor (not shown) is driven, the cutter head 32 turns to excavate the ground with a large number of cutter bits 33, and the excavated earth and sand can be taken into the muddy water chamber 13. The mud chamber 13 has a mud feed pipe 14 and a mud discharge pipe 1 that extend behind the tunnel 12 already constructed at one end.
6 is open at the other end thereof, and an agitator 15 for stirring and mixing the excavated earth and sand with the muddy water is provided near the opening of the drainage pipe 16.
Is installed. Further, a plurality of shield jacks 35 are arranged side by side in the circumferential direction at the rear part of the skin plate 31, and the shield jacks 35 extend rearward in the digging direction and are pressed against the existing segments 36.
The skin plate 31 can be advanced by the reaction force. A muddy water treatment facility 18 is installed in the excavated tunnel 12. The muddy water treatment equipment 18 separates the excavated earth and sand conveyed by the mud drainage pipe 16 into a particle component and muddy water. 11
Is returned to the mud chamber 13. In the muddy water treatment equipment 18 of the present embodiment, a fluid decompression device 41 is interposed in the middle of the drainage pipe 16. The fluid pressure reducing device 41 performs functions such as detection, calculation, amplification, control, and operation by using a pure fluid element that controls the behavior of the fluid by the flow of the fluid without using a mechanically movable part. It is an application of the Fluidics engineering field for systems. That is, as shown in FIG. 1 and FIG.
Has a hollow conical shape with a large diameter at the top and a small diameter at the bottom. An inflow pipe 43 as a fluid inflow path is connected to the upper part of the apparatus main body 42 along the outer peripheral tangential direction, while an outflow pipe as a fluid outflow path is formed in the lower part of the apparatus main body 42 along the axial direction thereof. 44 are connected. Further, an upper part of the apparatus main body 42 is provided with an inflow pipe 43 from the apparatus main body 4.
A control pipe 45 as a control fluid inflow passage is connected along a direction intersecting the fluid flowing into the inside 2. Each end of the inflow pipe 43 and the outflow pipe 44 is connected to the mud drain pipe 16, the inflow pipe 43 is connected to the mud chamber 13 of the shield excavator 11, and the outflow pipe 44 is connected to the mud treatment equipment 18 side. You. In order to excavate and form a tunnel, as shown in FIG. 6, first, a plurality of shield jacks 35 are operated to advance the skin plate 31 by a reaction force against the existing segment 36. Then, the drive motor cutter head 32 is turned, and the ground is excavated by the cutter bit 33. And the earth and sand excavated by the cutter bit 33 is taken into the muddy water chamber 13 and
4, muddy water is fed from the extruder 4, the excavated earth and sand and the muddy water are agitated and mixed by the agitator 15, and discharged to the muddy water treatment equipment 18 by the drainage pipe 16. Next, one of the shield jacks 35 is actuated in the contracting direction to move the existing segment 36.
And a new segment 3 is formed in this space.
Attach 6 and fix. By repeating this operation, a tunnel of a predetermined length is excavated and formed. At this time, the mud discharged from the mud chamber 13 by the drain pipe 16 reaches the fluid pressure reducing device 41. Here, as shown in FIG. 1 and FIG. 2, the muddy water flows into the device main body 42 from the inflow pipe 43, while the control fluid flows from the control pipe 45 into the device main body 42, and the muddy water flows into the device main body 42. It descends as a vortex along the inner wall surface. Then, the muddy water that has become a vortex flows out from the outflow pipe 44 at the lower part of the apparatus main body 42. In this case, it becomes vortex since almost perpendicular direction to the mud F ₁ and the control fluid F ₃ which has flowed into the apparatus main body 42 from the control tube 45 from the inlet pipe 43 and flows into the apparatus body 42, resulting in large pressure loss . Accordingly, the muddy water F ₂ whose pressure has been reduced to the atmospheric pressure is discharged from the outflow pipe 44 and sent to the muddy water treatment equipment 18. As described above, in the present embodiment, the muddy water discharged from the muddy water chamber 13 of the shield excavator 11 by the drainage pipe 16 is lowered to the atmospheric pressure by the fluid pressure reducing device 41, and then the muddy water treatment equipment 18 And the muddy water can be prevented from spouting here. Even if the pressure of the muddy water flowing into the apparatus main body 42 of the fluid pressure reducing device 41 fluctuates due to the fluctuation of the face pressure, the muddy water flowing out of the outflow pipe 44 is adjusted by adjusting the control fluid amount from the control pipe 45. The pressure can be controlled to a predetermined value while keeping the flow rate constant. Also, there is no need to provide an orifice or a gate at the outlet of the sludge pipe 16 to narrow the discharge port, and the sludge pipe 16 is not clogged with muddy sediment and clogged. Let out. As described above , according to the muddy water treatment apparatus for a tunnel excavator according to the present invention as described in detail with reference to the embodiments ,
Fluid decompression device for treating muddy water generated by ground excavation
And together with the upper form a fluid inflow passage mud along the outer peripheral tangential direction to the upper portion of the main body flows forming a hollow cone shape, which is the lower small-diameter large diameter, and mud flowing into the interior from the fluid inlet channel While forming the control fluid inflow path along the intersecting direction, muddy water is discharged along the axial direction at the bottom of the main body
Configured to form a fluid outlet channel is, pairs variations in working face pressure
When the corresponding control fluid flows into the body,
It is possible to keep the flow rate of mud flowing out of the body constant, and with a simple and lightweight structure, the mud flowing into the main body from the fluid inflow passage is controlled by the control fluid, By controlling the flow rate and the flow direction, the pressure can be easily reduced and the fluid can be discharged from the fluid outflow passage.Also , even if the pressure of the muddy water flowing into the main body fluctuates, the control fluid amount can be adjusted. Further, it is possible to control the flow rate of the muddy water to be a predetermined pressure while keeping the flow rate constant, so that maintenance and maintenance of the apparatus are easy, and the cost is not increased.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram showing a fluid pressure reducing device according to one embodiment of the present invention. FIG. 2 is a schematic plan view illustrating a fluid pressure reducing device according to the present embodiment. FIG. 3 is a schematic diagram of a muddy water treatment device of a shield excavator equipped with the fluid pressure reducing device of the present embodiment. FIG. 4 is a schematic diagram showing a tunnel excavator used in tunnel construction and a conventional muddy water treatment facility. FIG. 5 is a processing block diagram showing a specific method of treating muddy water by the muddy water treatment equipment. FIG. 6 is a schematic diagram showing a tunnel excavator used for tunnel construction and another conventional muddy water treatment facility. [Description of Signs] 11 Shield excavator 12 Tunnel 13 Mud chamber 14 Mud feed pipe 16 Drain pipe 18 Mud water treatment equipment 41 Fluid decompression device 42 Main unit 43 Inflow pipe 44 Outflow pipe 45 Control pipe

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tetsuo Ikoma 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation (72) Inventor Hiroyuki Kubo 1-2-3 Shibaura, Minato-ku, Tokyo Shimizu Construction Corporation (72) Inventor Toshio Watanabe 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Corporation (56) References JP-A-5-263794 (JP, A) JP-A-48- 84938 (JP, A) JP-A-4-41897 (JP, A) JP-A-53-123524 (JP, A) JP-A-58-142405 (JP, U) JP-A-56-25804 (JP, U) Actual Opening Hei 3-18296 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16L 55/00-55/22 E21D 1/00-9/14 F15C 1/00-7 / 00 F15D 1/00-1/14

Claims (1)

(57) [Claims] [Claim 1] Excavated earth and sand generated by ground excavation
And treated in a muddy water treatment facility through a fluid pressure reduction device.
A muddy water treatment device for a tunnel excavator,
In the body pressure reducing device, a fluid inflow passage through which muddy water flows in a direction of a tangent on the outer periphery of the main body is formed in an upper portion of a main body having a hollow conical shape in which an upper portion has a large diameter and a lower portion has a small diameter. A control fluid inflow passage is formed along a direction intersecting with the muddy water flowing into the inside of the main body from the fluid inflow passage, while the muddy water is discharged along the axial direction at a lower portion of the main body.
Fluid outflow path is formed is formed that, versus the variation of the working face pressure
A corresponding flow of the control fluid into the body,
Keep the flow rate of mud flowing out of the fluid outflow channel constant.
Mud water treatment of tunnel excavator characterized by the possibility
Equipment .