JPH10115180A - Device for dischaging slurry in tunnel in slurry shield method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for discharging slurry in a tunnel in which slurry stagnating the tunnel can be discharged directly onto the ground without allowing the slurry to stay in a vertical shaft. SOLUTION: A tunnel 10 is excavated from the bottom of a vertical shaft 4 by means of a shield excavator 2 and a slurry feed pipe 14 and a slurry discharge pipe 16 are provided from a slurry treatment device 18 installed on the ground to a working face 10a, and pressurized slurry is circulated to the face 10a through these pipes 14, 16 thereby to execute a slurry shield method. And a drainage pipe 20 is provided from the bottom of the shaft 4 to a position in the tunnel 10 where slurry stagnates and a vacuum pump 22 is connected to a slurry outlet of the pipe 20 to draw the slurry in the tunnel 10. And a bypass pipe 32 is connected to a delivery port 22a of the pump 22 and the pipe 16 and a sand pump 34 is provided in the pipe 32 to send the slurry into the pipe 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a muddy water discharge device in a tunnel for discharging muddy water accumulated in a tunnel to the ground in a muddy water shield method.

[0002]

2. Description of the Related Art FIG. 2 shows the construction of a tunnel by a muddy water shield method. Reference numeral 2 in this figure denotes a shield excavator that excavates underground from the bottom of the shaft 4 by rotating the cutter head 6, and a tunnel 10 is formed by lining with a segment 8 at the rear of the shield excavator 2. Is being built.

In the shield machine 2, an end of a muddy water pipe 14 and an end of a muddy water pipe 16 are disposed between a partition wall member 12 disposed near the cutter head 6 and the face 10a.
The muddy water pipe 14 is connected to a muddy water treatment facility 18 installed on the ground, and pressurized muddy water is supplied from the muddy water treatment equipment 18 to the face 10 a via the muddy water pipe 14.

[0004] Further, the drainage pipe 16 has a drainage pump 17 interposed in its conduit, and when the drainage pump 17 is driven,
The excavated soil on the face 10a is used as muddy water to discharge
Is discharged to the muddy water treatment facility 18 via the in this way,
The muddy water pipe 14 and the muddy water pipe 16 circulate muddy water toward the face face 10a, thereby stably excavating the face face 10a.

[0005] The muddy water treatment equipment 18 is provided with a drainage water pipe 16.
Is separated into earth and sand and muddy water, and the muddy water adjusted to a predetermined specific gravity and viscosity is supplied again to the face 10a via the muddy water pipe 14.

By the way, when constructing the tunnel 10, muddy water accumulates in the excavated ground, and if the muddy discharge operation is not performed as needed, it will hinder the construction. Therefore, a muddy discharge device is installed. In this muddy water discharge device, a muddy water suction pipe (drainage pipe) 20 is arranged from the shaft 4 to a muddy water generation position on the excavation ground, and the muddy water suction pipe 20 is connected to a vacuum pump 22 installed at the bottom of the shaft 4. . A pump 24 is installed at the bottom of the shaft 4, and a muddy water discharge pipe 26 connected to the pump 24 is set up to the ground and connected to a thickener 18a of the muddy water treatment equipment 18.

As a result, the muddy water collected in the excavated ground is temporarily discharged to the bottom of the shaft 4 by suction of the vacuum pump 22. The muddy water collected in a predetermined amount at the bottom of the shaft 4 is sucked up by the pump 24 and discharged to the thickener 18a via the muddy water discharge pipe 26.

[0008]

However, in the above-described muddy water discharging device, a storage tank for storing muddy water is provided at the bottom of the shaft 4, and a long muddy water discharge pipe 26 extends from the bottom of the shaft 4 to the muddy water treatment equipment 18. Must be provided, and furthermore, a pump 24 having an increased discharge capacity must be installed, which causes problems in terms of elongation of the construction period and equipment costs.

A pump 24 is provided at the bottom of the shaft 3.
Even if muddy water is discharged, mud tends to remain, so the bottom must be cleaned periodically.

The present invention has been made in view of the above circumstances, and discharges muddy water collected in a tunnel directly to the ground without collecting it at the bottom of a shaft, shortening the construction period, and reducing construction cost and labor. It is an object of the present invention to provide a muddy water discharge device in a tunnel using a muddy water shield method that can perform the method.

[0011]

In order to achieve the above object, according to the first aspect of the present invention, a tunnel is excavated from the bottom of a shaft by a shield excavator and sent from a mud water treatment facility installed on the ground to a face. The muddy water pipe and the muddy water pipe are arranged, and in the muddy water shield method in which the muddy water pressurized by the muddy water pipe and the muddy water pipe is circulated toward the face face,
A drain pipe is arranged from the bottom of the shaft to a position where muddy water is stored in the tunnel, and a vacuum pump is connected to a muddy water outlet of the drainage pipe to suck muddy water in the tunnel, and the vacuum pump A bypass pipe is connected between a discharge port and the drainage pipe, and a sand pump is interposed in the bypass pipe to feed the muddy water to the drainage pipe. According to a second aspect of the present invention, in the muddy water discharge device in a tunnel of the muddy water shield method according to the first aspect, the bypass pipe between the discharge port of the sand pump and the drainage pipe includes the drainage pipe. A check valve for preventing the flow of muddy water from the water pipe side to the bypass pipe side was provided.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A muddy drainage device in a tunnel of a muddy shield method according to the present invention will be described below with reference to FIG. The same components as those shown in FIG.
The same reference numerals are given and the description is omitted.

In the present embodiment, a long muddy water discharge pipe 26 and a pump 24 are not provided unlike the conventional apparatus, and a muddy water discharge device 30 is provided between the vacuum pump 22 and the muddy water pipe 16.
Is provided.

That is, the muddy water discharging device 30 includes a bypass pipe 32 connected between the discharge port 22a of the vacuum pump 22 and the muddy water pipe 16 on the suction port 17a side of the discharge pump 17, and a vacuum pipe of the bypass pipe 32. Pump 22
It comprises a sand pump 34 interposed on the side and a check valve 36 interposed on the muddy water pipe 16 side of the bypass pipe 32.

The sand pump 34 is a centrifugal pump made of a wear-resistant material.
The muddy water discharged from the discharge port 22a of the second
This is a pump that feeds pressure toward.

The check valve 36 has, for example, a structure in which a poppet 36a is built in a valve body.
The flow of fluid from the drainage pipe 16 side to the sand pump 34 side is allowed by the valve that blocks the poppet 36a by closing the valve body flow path. is there.

According to the muddy water discharging apparatus having the above-described structure, the muddy water collected in the excavated ground is sequentially sucked from the distal end of the muddy water suction pipe 20 by driving the vacuum pump 22.
The muddy water sucked by the vacuum pump 22 is driven by the sand pump 30 connected to the vacuum pump 22 via the bypass pipe 32, and the muddy water is sucked into the bypass pipe 32.
The water is sent out to the drainage pipe 16 via the check valve 36.
The muddy water sent to the muddy water pipe 16 is discharged to the muddy water treatment equipment 18 by driving the discharge pump 17.

Even if a large amount of muddy water is discharged from the face 10a side and the internal pressure of the drainage pipe 16 is higher than the internal pressure of the bypass pipe 32, a check valve 36 is interposed in the bypass pipe 32. The drainage pipe 16 to the bypass pipe 32
Muddy water does not flow back.

Therefore, in the present embodiment, a long muddy water discharge pipe 26 and a pump 24 having an increased discharge capacity as in the conventional apparatus are not required, and the muddy water is temporarily stored at the bottom of the shaft 4. Since a storage tank is not required, equipment costs can be reduced. Since mud does not remain at the bottom of the shaft 3, there is no need to perform cleaning work or the like, and labor can be significantly reduced.

Further, the muddy water discharging device 30 of the present embodiment
Discharge port 22a of vacuum pump 22 and discharge pump 17
A bypass pipe 32 connected between the drain pipe 16 on the suction port 17a side, a sand pump 34 interposed on the vacuum pump 22 side of the bypass pipe 32, and a bypass pipe 3
Since it is composed of the check valve 36 disposed on the side of the second mud feed pipe 16, the construction for disposing the apparatus can be completed in a single time.

In the present embodiment, the muddy water discharge device 30 is installed at the bottom of the shaft 4, but the present invention is not limited to this.
The same operation and effect can be obtained even if 0 is installed and connected to the drainage pipe 16.

[0022]

As described above, according to the first aspect of the present invention,
According to the muddy drainage system in the tunnel of the described muddy shield method, there is no need for a long muddy water discharge pipe that sends muddy water collected at the bottom of the shaft to the muddy water treatment equipment and a pump with an increased discharge capacity as in the conventional device In addition, since a storage tank for temporarily storing muddy water at the bottom of the shaft is not required, equipment costs can be reduced. And since mud does not remain at the bottom of the shaft, there is no need for cleaning work, and labor can be greatly reduced.

Further, the muddy water discharge device of the present invention has a configuration in which a bypass pipe is connected between the discharge port of the vacuum pump and the drainage pipe, and a sand pump is interposed in the bypass pipe. The installation work can be completed in a short time.

According to the second aspect of the present invention, the effect of the first aspect can be obtained, and a large amount of muddy water is discharged from the face side during the excavation of the tunnel to the drainage pipe. Even when the internal pressure is higher than the internal pressure of the bypass pipe, since the check valve is interposed in the bypass pipe, the muddy water can be discharged normally without the muddy water flowing back from the drainage pipe to the bypass pipe. it can.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a muddy water discharge device in a tunnel according to the present invention.

FIG. 2 is a schematic view showing a conventional muddy water discharge device in a tunnel using a muddy water shield method.

[Explanation of symbols]

 Reference Signs List 2 shield machine 4 shaft 10 tunnel 10a face face 14 muddy water pipe 16 muddy water pipe 17 discharge pump 17a suction port 18 muddy water treatment equipment 18a thickener 20 muddy water suction pipe (drainage pipe) 22 vacuum pump 22a discharge port 24 pumping pump 26 muddy water Discharge pipe 30 Muddy water discharge device 32 Bypass pipe 34 Sand pump 36 Check valve 36a Poppet

Claims (2)

[Claims] 1. A tunnel is excavated from the bottom of a shaft by a shield machine, and a mud pipe and a mud pipe are arranged from a mud water treatment facility installed on the ground to a face face. In a muddy water shield method in which pressurized muddy water is circulated toward the face, a drain pipe is arranged from a bottom of the shaft to a position where muddy water is stored in the tunnel, and a vacuum outlet is provided at a muddy water outlet of the drainage pipe. A pump is connected to suck muddy water in the tunnel, a bypass pipe is connected between the discharge port of the vacuum pump and the muddy water pipe, and a sand pump is interposed in the bypass pipe to remove the muddy water. A muddy water discharge device in a tunnel using a muddy water shield method, wherein the muddy water is sent into the muddy water pipe. 2. A check valve for preventing a flow of mud from the waste water pipe to the bypass pipe is provided in the bypass pipe between the discharge port of the sand pump and the waste water pipe. The muddy water discharge device in a tunnel according to claim 1, wherein the muddy water shield method is used.