JP2981527B2 - Spring water suction device in underground tunnel construction - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spring suction device used in underground tunnel construction for discharging spring water generated when excavating an underground tunnel or the like to the ground.

[0002]

2. Description of the Related Art In excavation work of an underground tunnel, debris (excavated soil) generated by the excavation work is transported to the ground by a trolley. Since the minecarts are submerged in a low position and submerged, the spring of such a face has been installed with a submersible pump and pumped up to the ground.

That is, when the depth of the face 21 is shallow as shown in FIG. 2A, the submersible pump 20 is installed in the spring water 22 near the face 21 and is pumped to the ground via the hose 23. In addition, as shown in FIG. 2 (b), when the depth of the face 21 is deep, when the pumping capacity of one submersible pump 20 is exceeded, a tank 24 is installed on the face 21 and in the middle of the ground, and the submersible pump 20 is installed. The pumped water pumped in step 20 is temporarily stored in a tank 24, and the spring water stored in the tank 24 is pumped to the ground by a submersible pump installed in the tank 24.

On the other hand, excavation work for an underground tunnel is used together with excavation work using a rock drill, earth auger, or the like, and blasting is performed at the leading position of excavation to increase the excavation work efficiency. However, when the blasting is performed, it is dangerous to install a submersible pump nearby, so the submersible pump must be at least 50 m away from the blasting position.

As described above, conventionally, the underwater pump has to be moved every time blasting is performed at the excavation position of the tunnel, and after the blasting is completed, the submersible pump is required to be installed again at the leading excavation position.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional circumstances, and is intended to continuously pump up the spring water near the face in order to transport the slip coming out of the face to the ground. Further, it is an object of the present invention to provide a spring water suction device that can be used with a submersible pump for pumping spring water set apart from a blasting position.

[0007]

In order to solve the above-mentioned problems, a spring water suction device for underground tunnel construction according to the present invention is provided with a first water suction device located at a predetermined distance from a face 2 in an excavation pit 1.
A closed chamber 3a, a hose 4 is connected to the closed chamber 3a, and the tip of the hose 4 is guided into the spring water 12 near the face 2;
a submersible pump 5 is provided inside the submersible pump 5, and the other end of the hose 4 connected to the submersible pump 5 is placed near the ground from the first closed chamber 3 a within the range of the suction force of the submersible pump 5. The closed chambers 3 in which the submersible pumps 5 are respectively installed are communicated with the upper part of the chamber 3b.
To the vicinity of the ground via a hose 4 and a submersible pump 5 in a closed chamber 3 closest to the ground.
The hose 4 connected to the closed tank 6 is led out to the ground, the lower end of the hose 7a from above communicated with the closed tank 6 is drooped downward into the closed tank 6, and the upper end of the hose 7b from below is closed. In the tank 6, the upper end of the hose 7b from the lower side was arranged at a position higher than the lower end of the hose 7a from the upper side, and the closed tank 6 thus formed was provided in the vacuum tank 8 on the ground. The hose 7a and the hose 7b are connected to each other within a range where the suction force of the suction pump 8a can reach, and the lowermost hose 7b communicates with the upper part of the first closed chamber 3a.

[0008]

In the present invention, the lowermost submersible pump 5 is kept away from the blasting of the face 2 of the digging pit 1 so as not to be affected by the blasting. And the submersible pump 5 needs to be submerged. For this purpose, first, the suction pump 8a is operated, and suction is performed while relaying the air through the closed tanks 6, 6,..., And the first closed chamber 3a is connected via the hose 4 guided from the first closed chamber 3a to the spring water 12. Pump it in.

Therefore, when the submersible pump 5 in the first closed chamber 3a is submerged in the spring water 12, the submersible pump 5 is operated to pump the spring water 12 and store it in the upper second closed chamber 3b. I do. The hose 4 connected to the submersible pump 5 in the first closed chamber 3a
This connection prevents the backflow of the pumped water pumped into the second closed chamber 3b and the upper closed chamber 3 by such a connection.

Next, when the submersible pump 5 in the second closed chamber 3b is submerged, the submersible pumps 5 in the second closed chamber 3 are operated, and the upper submersible pumps 5 are sequentially operated. The spring water 12 is continuously drawn out to the ground via the hose 4 connected to the submersible pump 5 provided at the top.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1A is a sectional view showing an embodiment of a spring water suction device in underground tunnel construction according to the present invention.
(b) is an enlarged sectional view of the closed tank shown in FIG. 1 (a).

In FIG. 1 (a), a first closed chamber 3a located closest to a face 2 installed in a digging pit 1 includes a face 2
It is installed at a predetermined distance from, but this separation distance,
It is assumed to be about 50 m which can avoid the effect of blasting on the face 2.

A hose 4 is connected to the first closed chamber 3a in a downward direction, and the end of the hose 4 is guided into spring water 12 coming out of the face 2. A submersible pump 5 is provided in the first closed chamber 3a, and from above the second closed chamber 3b installed close to the ground in the lift of the submersible pump 5 via a hose 4 connected to the submersible pump 5. Communicate while hanging inside. By such a connection, the backflow of the pumped water pumped into the second closed chamber 3b and the upper closed chamber 3 can be prevented. This second
The closed chamber 3b is provided with a submersible pump 5 as described above. Then, the required number of submersible pumps 5 are provided between the above-described closed chambers 3 via the hoses 4 with respect to the closed chambers 3 installed above the second closed chamber 3b. The hose 4 connected to the submersible pump 5 is led out to the ground.

A filter 10 is provided at the suction port of each submersible pump 5 to filter mud and the like in the spring water sucked into each closed chamber 3.

The vacuum tank 8 is installed on the ground of the excavation pit 1. A suction pump 8a is provided in the vacuum tank 8, and the inside of the vacuum tank 8 is depressurized, and a suction force is applied to a hose 7a connected to the vacuum tank 8.

In the closed tanks 6, 6,..., The lower end of the hose 7a from above connected to each closed tank 6 is drooped downward into the closed tank 6, and the upper end of the hose 7b from below is connected to the closed tank. I started up in the upper part in 6,
The upper end of the hose 7b from below is connected to the hose 7 from above.
It is provided at a position higher than the lower end of a. In addition, each closed tank 6
A throttle pipe 9 having a throttle port is fitted to the lower end of a hose 7a which is suspended from above and increases the suction flow rate.

Are connected between the vacuum tank 8 and the lowermost first closed chamber 3a via a hose 7a from above and a hose 7b from below to form a first sealed tank. The inside of the chamber 3a communicates with the inside of the chamber 3a while maintaining airtightness. With such a configuration, as a result of the suction force of the vacuum tank 8 on the ground acting sequentially in each of the closed tanks 6, 6,..., The spring water 12 sucked through the hose 7b from below is stored in each of the closed tanks 6. Then, this can be sucked upward through the hose 7a from above.

The installation intervals of the closed tanks 6 are connected via the hoses 7a and 7b within the range where the suction force of the suction pump 8a provided on the ground reaches, that is, within the range of 5 to 6 m.

In the above-described configuration, first, the spring 12 near the face 2 is sucked into the first closed chamber 3a by operating the suction pump 8a. When the submersible pump 5 is submerged, the submersible pump 5 is operated, and then the spring water stored in the second closed chamber 3b is sequentially drawn into the closed chamber 3 installed toward the ground so that the spring water is pumped up. When each submersible pump 5 is submerged while storing the spring water 12, the submersible pump 5 is sequentially sucked into the closed chamber 3 at a higher position.

As described above, in the above configuration, the excavation pit 1
A submersible pump 5 is installed in the first closed chamber 3a in order to pump the spring water 12 that has come out near the face 2 into the ground, but each submersible pump 5 is submerged in the water when used. Is a condition. In the present invention, the submersible pumps 5 are housed in the respective closed chambers 3, and the lower submersible pumps 5 pump the spring water 12 into the closed chamber 3 installed thereabove and submerge the submersible pumps 5. Operable in each closed chamber 3.

As the depth of the excavation pit 1 increases, the submersible pump 5 is connected to the hose 4 connected to the lowermost closed chamber 3a, and the lowermost closed chamber 3a is further connected to the hose 4. The treatment of the spring water 12 according to the progress of the excavation pit 1 by the method of newly hanging the hose 4 and leading it to the spring water 12, while connecting the closed tank 6 via the hoses 7 a and 7 b in accordance with this. Can be.

[0023]

As described above, according to the present invention,
A sealed tank 6 connected to the lowermost sealed chamber 3a,
6, the submerged pump 3 is brought into a submerged state by pumping the spring water 12 so as to enable the operation of the submersible pump 5 even in the lowermost closed chamber 3a installed away from the face 2 and then the upper closed chamber 3 , The spring water 12 of the face 2 can be continuously pumped to the ground. Therefore, it is possible to carry out the work of carrying out the slip coming out of the face without interruption.

Even when the blasting is performed on the face 2 of the excavation pit 1, since the lowermost submersible pump 5 is installed at a position where the blasting is not affected, the submersible pump 5 is continuously moved without moving the submersible pump 5. Can be used for

[Brief description of the drawings]

FIG. 1 (a) is a sectional view showing an embodiment of a spring water suction device in underground tunnel construction according to the present invention, and FIG.
FIG. 2 is an enlarged sectional view of the closed tank shown in FIG.

FIG. 2 is a sectional view showing a conventional spring water suction method,
FIG. 2 (a) shows the case of an excavation pit with a shallow face, and FIG. 2 (b) shows the case of an excavation pit with a deep face.

[Description of sign]

DESCRIPTION OF SYMBOLS 1 ... Drilling pit, 2 ... Face, 3 ... Closed chamber, 3a ... 1st closed chamber, 4 ... Hose, 5 ... Submersible pump, 6
... closed tanks, 7a, 7b ... hoses connected to closed tanks.

Claims (1)

(57) [Claims] 1. A first closed chamber 3a is provided at a predetermined distance from a face 2 in an excavation pit 1, and a hose 4 is connected to the closed chamber 3a. A submersible pump 5 is provided in the spring 12 and provided in the first closed chamber 3a. The other end of the hose 4 connected to the submersible pump 5 is connected to the first submersible pump 5 within the range of the suction power of the submersible pump 5. The required number of closed chambers 3 each having a submersible pump 5 connected to near the ground via a hose 4 is connected by a procedure of communicating from above the closed chamber 3a to above the second closed chamber 3b installed near the ground. At the same time, the hose 4 connected to the submersible pump 5 in the closed chamber 3 closest to the ground is led out to the ground, and the lower end of the hose 7a from above connected to the closed tank 6 is connected to the inside of the closed tank 6. While hanging downward, the upper end of the hose 7b from below is raised upward in the closed tank 6, and the upper end of the hose 7b from below is arranged at a position higher than the lower end of the hose 7a from above. The closed tank 6 thus formed is connected via the hoses 7a and 7b within the range of the suction force of the suction pump 8a provided in the vacuum tank 8 on the ground, and the lowermost hose 7b is connected to the first hose 7b. A spring suction device in an underground tunnel construction, wherein the spring suction device communicates with an upper portion of the closed chamber 3a.