JP2001248381A - Transport equipment for soil-containing fluid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid enlargement of the size of a sludge discharge pump. SOLUTION: In this transport equipment, a sludge discharge pipe 5 is opened to the air in the front flow side of a departure vertical shaft 7 and a soil separator 20 is installed in the opened part. The soil separator 20 is provided with a tank 22 having an opened top end and the closed bottom, a low head screen 24 installed in the tank 22 in the inclined state, a screen 25 provided in the top end of the tank 22, and a storage vessel 26 for the separation soil. The sludge discharge pipe 5 is divided in the front flow side of the vertical shaft 7, a division part in the sludge discharge pump 8 side is formed with a rotary valve 28, and the discharge port of the rotary valve 28 is opened to the screen 25. The division part of the sludge discharge pipe 5 in the vertical shaft 7 side is communicated with a pump 30 having a suction port in the bottom of the tank 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facility for transporting a fluid containing earth and sand, and more particularly to an improved technique for transporting such a fluid upward against gravity.

[0002]

2. Description of the Related Art A shield method is known as a method employed when constructing an underground tunnel in an urban area or in the vicinity thereof, and a muddy water shield method is known as one type of such a method.

[0003] In the muddy water shield construction method, in order to discharge the excavated earth and sand while maintaining the stability of the face, a fluid transport facility for transporting the muddy water containing the excavated earth and sand is provided. FIG. 2 shows a typical example of the construction state of the muddy water shield method.

[0004] In the figure, reference numeral 1 denotes a shield machine, on the tip side of which is provided a bit 2 for excavating earth and sand, and on the back side of the bit 2, a chamber 3 filled with muddy water is defined. Has been established.

[0005] A chamber 3 has a mud pipe 4 for feeding muddy water.
And a mud discharge pipe 5 for discharging mud water containing excavated earth and sand. From the rear end side of the shield machine 1, the feed and drain pipes 4 and 5 pass through the inside of a tunnel that has already been constructed by assembling the segment 6, and after passing vertically through the inside of the starting shaft 7, It extends to the ground side. In the middle of the drainage pipe 5, a drainage pump 8 is provided for feeding wastewater containing excavated earth and sand under pressure.

On the ground side, a muddy water production plant 9 equipped with a slurry tank and the like, and a muddy water treatment plant 10 equipped with a filter press and the like are installed. One end of the drainage pipe 5 is connected to the muddy water treatment plant 10.

In the thus constructed muddy water shield method, the drainage pump 8 and the drainage pipe 5 constitute the above-described fluid transport facility. Such a fluid transport facility includes the following technology. Challenges.

[0008]

That is, in a fluid transporting facility in which a mud pump 8 is installed in the middle of the mud pipe 5, the mud water is pumped upward in the vertical shaft 7 at the pipe section. Since the wastewater contains excavated earth and sand and has a high fluid density, it is necessary to use a wastewater pump 8 having a large lifting power.

[0009] The sludge pump 8 having a large lifting power is generally large, and the deeper the tunnel is constructed,
When the size of the sludge pump 8 is increased and the narrow tunnel space is occupied by the sludge pump 8, the segment 6
Transport operation, etc., which may reduce the efficiency of tunnel construction work.

[0010] The present invention has been made in view of such a conventional problem, and an object of the present invention is to avoid an increase in the size of a sludge pump for pumping a liquid fluid in a pipe. Another object of the present invention is to provide a sediment fluid transport facility that can contribute to improvement of construction efficiency.

[0011]

In order to achieve the above object, the present invention provides a transport pipe extending vertically from the vicinity of an underground earth and sand excavation site through a vertical shaft to the ground side. In a sediment-containing fluid transport facility for pumping a liquid fluid containing excavated sediment in a pipe by a mud pump installed in the middle of the pipe, the transport pipe is released on the upstream side of the shaft, and after the released part, A sediment separator for separating and removing excavated sediment contained in the liquid fluid was provided on the flow side. According to the transport equipment for soil-containing fluid configured as described above, the transport pipe is released on the upstream side of the shaft, and the release portion is provided with a soil-separation device that separates and removes excavated soil contained in the liquid fluid. Therefore, before pumping the shaft in the upward direction, the excavated earth and sand in the fluid is removed, and the fluid density in pumping the shaft in the upward direction is reduced. The transport pipe is a mud drain pipe having one end connected to a chamber of a mud shield excavator, and the sediment-containing fluid is mud drain water including mud and sand excavated by the mud shield excavator,
The release part may be provided with a valve for maintaining the muddy water pressure of the mud shield excavator, so that the present invention can be applied to the mud shield construction method.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG.
1 shows an embodiment of a facility for transporting a soil-containing fluid according to the present invention. In the following description, portions that are the same as or correspond to the above-described related art will be described using the same reference numerals.

FIG. 1 is a main part of a case where the equipment for transporting a soil-containing fluid according to the present invention is applied to a muddy water shield method, and this main part is an enlarged view of the vicinity of the part A in FIG. In the muddy water shield construction method, the chamber 3 is defined on the back side of the shield machine 1 as described above.

The chamber 3 has a mud pipe 4 for feeding muddy water.
And a mud discharge pipe 5 for discharging mud water containing excavated earth and sand. These feed and drain pipes 4 and 5 pass through the inside of a tunnel already constructed by assembling the segment 6 from the rear end side of the shield machine 1, pass through the inside of the starting shaft 7 up and down, and then reach the ground side. Has been extended. In the middle of the drainage pipe 5, a drainage pump 8 is provided for feeding wastewater containing excavated earth and sand under pressure.

On the ground side, a muddy water production plant 9 equipped with a slurry tank and the like and a muddy water treatment plant 10 equipped with a filter press and the like are installed. One end of the drainage pipe 5 is connected to the muddy water treatment plant 10.

In the muddy water shield method constructed as described above, the drainage pump 8 and the drainage pipe 5 constitute a fluid transport facility. There were problems such as becoming.

Therefore, in the present embodiment, the mud pipe 5 is opened to the atmosphere on the upstream side of the starting shaft 7, and a sediment separating device 20 is installed in the opened portion. The sediment separation device 20 includes a tank 22 having an open upper end and a closed bottom, and a tank 2.
Low-head screen 24 installed in an inclined state in 2
A screen 25 provided at the upper end of the tank 22;
And a storage container 26 for separated earth and sand.

The sludge pipe 5 is divided on the upstream side of the shaft 7,
A rotary valve 28 is provided at the separation section on the side of the mud pump 8, and the discharge port of the rotary valve 28 is connected to the screen 25.
It is open at the top. The rotary valve 28 is provided to prevent the pressure of the muddy water filled in the chamber 3 from decreasing and to prevent the face from collapsing.

In addition, at the section of the mud pipe 5 on the shaft 7 side,
A pump 30 provided with a suction port at the bottom of the tank 22 is connected in communication.

In the thus constructed fluid transport facility, when muddy water containing excavated sediment (fluid containing sediment) is pumped through the mud pipe 5 via the mud pump 8, the mud water is supplied to the rotary valve. Stop at the point of 28, and turn the rotary valve 2
A predetermined amount is discharged intermittently from the pump 8, and by controlling in this way, a decrease in the pressure in the pipe on the mud pump 8 side is prevented.

The muddy water discharged from the rotary valve 28 passes through the screen 25 and the low head screen 24 and accumulates at the bottom of the tank 22. At this time, the excavated earth and sand S contained in the muddy water is captured by the low head screen 24 and stagnates on the upper portion thereof.

In this case, since the low-head screen 24 is inclined, the captured excavated earth S falls and moves downward along the inclination, and enters the storage container 26 provided on the side of the tank 22. Will be accommodated.

At this time, the particle size of the excavated sediment S to be separated and removed from the wastewater is determined by the size of the mesh of the low head screen 24. By appropriately selecting the mesh, the density of the wastewater to be pumped thereafter is controlled. can do.

The excavated soil S is separated and removed, and the muddy water collected at the bottom of the tank 22 is sucked by the pump 30, passes through the muddy pipe 5, and is sent to the muddy water treatment plant 10.

According to the equipment for transporting sediment-containing fluid configured as described above, the drainage pipe 5 (transportation pipe) is released on the upstream side of the shaft 7, and at the open portion, the wastewater (sediment-containing water) is discharged. Since the sediment separation device 20 for separating and removing the excavated soil S contained in the liquid fluid) is provided, the excavated sediment in the muddy water (sediment-containing liquid fluid) is pumped upward in the shaft 7 before being pumped upward. S is removed, and the fluid density when the inside of the shaft 7 is pumped upward is reduced.

For this reason, the lifting force of the pump 30 can be reduced by the removal of the excavated earth and sand S.
0 can be avoided.

In the case of this embodiment, the sludge pump 8
It is sufficient if the drainage pump 8 is provided upstream of the shaft 7 and has a capability of pumping wastewater to the rotary pump 28.
Can also be reduced in size.

Further, when constructing the shield tunnel, the inverted portion of the excavated tunnel may be backfilled with earth and sand. In the case of this embodiment, the excavated earth and sand S is discharged from the muddy water on the upstream side of the shaft 7. Are separated by the earth and sand separation device 20 in the pit, and stored in the storage container 26.

Therefore, the excavated sediment S separated and removed from the wastewater can be used as backfill soil in the invert portion. When the excavated sediment S is used in this way, the backfill sediment in the invert portion is carried in from outside. Compared to the case, it is possible to reduce labor and reduce the amount of industrial waste.

[0030]

As described above in detail, according to the equipment for transporting soil-containing fluid according to the present invention, it is possible to avoid the increase in the size of the sludge pump for pumping the liquid fluid in the pipe, thereby improving the construction efficiency. Can be improved.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a main part showing an embodiment of a facility for transporting a sediment-containing fluid according to the present invention.

FIG. 2 is an overall view showing an example of a muddy water shield construction method to which the transportation equipment of FIG. 1 is applied.

[Explanation of symbols]

 Reference Signs List 20 sediment separator 22 tank 24 low head screen 26 storage container 28 rotary valve 30 pump

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Takashi Kitaoka 2-15-2 Konan, Minato-ku, Tokyo F-term (reference) 2D054 AC05 DA08 DA12 DA19 DA32 DA35

Claims (2)

[Claims] 1. A transportation pipe is extended from the vicinity of an underground excavation site to a ground side by vertically penetrating through a vertical shaft, and a liquid containing excavated soil is discharged by a mud pump installed in the middle of the transportation pipe. In a transportation facility for soil-containing fluid that pumps fluid in a pipe, the transportation pipe is released upstream of the shaft, and excavated soil contained in the liquid fluid is separated and removed downstream of the released portion. Transport equipment for soil-containing fluid, characterized in that a soil-separation device is provided. 2. The drainage pipe having one end connected to a chamber of a mud shield excavator, wherein the sediment-containing fluid contains sediment and mud excavated by the mud shield excavator. The earth and sand-containing fluid transport equipment according to claim 1, wherein a valve for maintaining the mud pressure of the mud shield excavator is provided in the release unit.