JP3790935B2 - Muddy water suction device in underground construction - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a muddy water suction device in underground construction used for transferring muddy water generated when digging a digging hole such as an underground tunnel to the ground.
[0002]
[Prior art]
In excavation work such as underground tunnels, the soil excavated underground becomes sludge-like mud and accumulates in the vertical shaft.
[0003]
In order to transfer such muddy water to the ground, a suction device shown in FIG. 4 has been conventionally used.
[0004]
In this apparatus, a vacuum tank 33 containing a pump 32 is provided in the lowermost beam 31 of a vertical shaft 30 dug in the ground, a vacuum pump 34 is installed on the ground, and a pipe 36 laid in a horizontal shaft 35 is connected to the vertical shaft. Connected to a vacuum tank 33, this vacuum tank 33 is connected to a vacuum pump 34 on the ground with a pipe 37, and a check valve 38a is provided on a pipe 38 connected to the pump 32 in the vacuum tank 33 so that the tip of the pipe 38 is connected. It was pulled out to the ground.
[0005]
Further, a separator 39 is provided in the middle of the pipe 36 laid in the horizontal shaft 35, and the separator 39 separates solids such as rake in muddy water.
[0006]
In such an apparatus, when the vacuum pump 34 on the ground is driven, a suction force is generated in the pipe 36 of the horizontal shaft due to the negative pressure in the vacuum tank 33 of the vertical shaft. At the suction port of the pipe 36 of the horizontal shaft, a gap is formed in the upper surface of the muddy water so that air is sucked at the same time, and the muddy water is fed into the vacuum tank 33 by this air flow. The muddy water that has flowed into the vacuum tank 33 is sent to the ground by driving the pump 32 in the vacuum tank 33.
[0007]
[Problems to be solved by the invention]
However, in this apparatus, since the tip of the pipe 38 connected to the pump 32 in the vacuum tank 33 in the vertical shaft is released to the atmospheric pressure on the ground, it is affected by the atmospheric pressure via the pipe 38. As a result, the delivery capacity of the pump 32 in the vacuum tank 33 of the shaft is reduced by the amount corresponding to the atmospheric pressure. For this reason, when the depth of the vertical shaft 30 is about 10 m, the pump 32 cannot send muddy water in the vertical hole vacuum tank 33 to the ground.
[0008]
In order to make up for this lack of exhaust power, another pump placed in the atmosphere is installed at the lateral position of the vacuum tank 33 in the vertical shaft, and this pump sucks the muddy water in the vacuum tank 33 in the vertical shaft and discharges it to the ground. Although the method of doing this is also conceivable, the equipment cost becomes high, and the inside of the vertical shaft 30 is narrowed by the amount of the added pump, resulting in inconvenience that the work in the vertical shaft 30 is obstructed.
[0009]
Furthermore, the conventional suction device has a problem that cement water in the muddy water is precipitated in the vacuum tank 33 in the vertical hole 30 and adheres to the bottom surface of the vacuum tank 33 in a solidified state. In order to clean the inside of the vacuum tank 33, it is necessary to temporarily stop the muddy water discharge operation and release the vacuum tank 33. Therefore, the continuous operation of the apparatus must be stopped.
[0010]
In addition, as shown in FIG. 4, if a separator 39 is provided in the middle of the pipe 36 in the horizontal shaft 35 in order to prevent solids such as rake from settling in the vacuum tank 33, Also, cement components in the muddy water precipitate. In order to remove the deposit, it is necessary to stop the apparatus, which hinders continuous operation.
[0011]
The present invention has been made in view of the circumstances as described above, and eliminates the influence of atmospheric pressure on the ground, thereby maximizing the ability of the pump to achieve the power output several times that of the conventional device. An object of the present invention is to provide a muddy water suction device in underground construction that can discharge muddy water in a deep excavation shaft to the ground.
[0012]
Furthermore, the present invention automatically processes the cement components so that they do not solidify and adhere to the vacuum tank, thereby eliminating the need for cleaning in the vacuum tank, and without having to stop the automatic discharge operation. An object of the present invention is to provide a muddy water suction device for underground construction that is performed during continuous operation.
[0013]
[Means for Solving the Problems]
In order to achieve the above object, the muddy water suction device in the underground work of the present invention is connected to the vacuum tank without releasing the pipe connected to the pump in the vacuum tank in the mine to the atmospheric pressure on the ground, Muddy water can be transferred by pump between tanks without pressure difference, eliminating the influence of atmospheric pressure, which was a problem in the past, so that the pump in the vacuum tank in the mine exhibits its original capacity Therefore, it is possible to increase the transmission capability far more than that of the conventional apparatus.
[0014]
In addition, the diameter of the pipe connecting the vacuum tank in the pit and the ground vacuum tank is smaller than the diameter of the pipe provided in the horizontal pit, so that the vacuum tank on the ground is larger than the tank on the vertical pit. As a result, the pressure exerts a suction force against the muddy water in the vacuum tank of the vertical shaft, and it is possible to further improve the delivery capacity of the pump provided in the vacuum tank.
[0015]
Furthermore, an inner gate that opens and closes by its own weight is provided at the discharge port provided on the bottom surface of the vacuum tank in the mine, and a discharge gate is provided at the discharge port of the holding chamber provided on the downstream side of the discharge port. When the discharge gate is closed, the inner gate is opened by its own weight, while when the discharge gate is opened, the inner gate can be closed by atmospheric pressure. It becomes possible to discharge solids such as reki.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0017]
FIG. 1 is a schematic view showing an embodiment of the mud suction device of the present invention. FIG. 2 is a partial cross-sectional view of the vicinity of the discharge port of the vacuum tank in the vertical shaft of FIG. 1, showing a state in which the discharge gate is closed. FIG. 3 is a partial cross-sectional view of the vicinity of the discharge port of the vacuum tank in the vertical shaft of FIG. 1, showing a state in which the discharge gate is opened.
[0018]
In FIG. 1, a vertical shaft 1 is excavated in the ground, and a horizontal shaft 2 is excavated at the bottom of the vertical shaft 1. A plurality of beams are provided in the vertical shaft 1, and a vacuum tank 6 having a pump 5 built therein is installed in the lowermost beam 3. In addition, a pipe 7 that leads into the horizontal shaft 2 is connected to the vacuum tank 6 of the vertical shaft.
[0019]
On the ground, a vacuum tank 9 provided with a pump 8 is installed, and the ground vacuum tank 9 is connected to a vacuum tank 6 of a vertical shaft through a pipe 10.
[0020]
A vacuum pump 11 installed on the ground is connected to the vacuum tank 9 on the ground via a pipe 12.
[0021]
With such a configuration, when the vacuum pump 11 is operated, the vacuum tank 6 in the vertical shaft is negatively pressured as the vacuum tank 9 on the ground is negatively pressured. Therefore, the pipe 7 laid in the horizontal shaft 2 is used. A suction force is generated.
[0022]
Therefore, the pipe 7 of the horizontal shaft is guided to the muddy water reservoir, and the suction port of the pipe 7 is opened with a gap in the upper surface of the muddy water so that the air is sucked. Suction and delivery to the inside of the vacuum tank 6 of the vertical shaft can be performed. In addition, the muddy water sucked in this way includes moisture, solids such as reki and air.
[0023]
On the other hand, the pump 5 in the vacuum tank 6 in the vertical shaft is connected to the above-described vacuum tank 9 through a pipe 13 connected with a check valve 13a on the way. With such a configuration, by operating the pump 5 in the vertical hole vacuum tank 6, the muddy water D in the vacuum tank 6 can be sent into the ground vacuum tank 9 through the pipe 13.
[0024]
Further, the muddy water D discharged to the ground vacuum tank 9 can be sent to an external muddy water reservoir (not shown) or the like via the pipe 14 by operating the pump 8 in the vacuum tank 9. it can.
[0025]
A check valve 14 a is provided in the middle of the pipe 14 connected to the pump 8 in the ground vacuum tank 9 to prevent the backflow of muddy water flowing through the pipe 14, and a large amount in the ground vacuum tank 9. Barometric pressure is prevented from entering.
[0026]
In such a configuration, as described above, the vacuum tank 9 on the ground is set to a negative pressure by the operation of the vacuum pump 11 while being shut off from the atmospheric pressure. Moreover, since the above-described vacuum tank 9 and the vertical pit vacuum tank 6 are connected by the pipe 10, the vertical pit vacuum tank 6 and the above-ground vacuum tank 9 have substantially the same pressure. The capacity of the pump 5 within 6 can be maximized.
[0027]
Further, in the suction device of the present embodiment, a 2 inch diameter pipe is used for the pipe 10 connecting the vertical pit vacuum tank 6 and the ground vacuum tank 9, and a 4 inch diameter is used for the pipe 7 laid in the horizontal pit 2. As the pipe 10 is made smaller in diameter, the vacuum tank 9 on the ground has a negative pressure larger than that of the tank 6 in the vertical shaft, and this is inside the vacuum tank 6 in the vertical shaft. A suction force is exerted on the muddy water D, and the delivery capability of the pump 5 provided in the vacuum tank 6 is further improved.
[0028]
Further, in the suction device of the present embodiment, as shown in FIGS. 2 and 3, the discharge port 6a is provided at the bottom of the vacuum tank 6 of the vertical shaft, and the inner gate 15 is freely opened and closed by a hinge at the discharge port 6a. Is provided. Further, a pipe 17 constituting the reservation chamber 16 is connected to the downstream side of the discharge port 6 a, and a discharge gate 18 that is opened and closed by a hinge is provided at the discharge port 17 a of the reservation chamber 16. The discharge gate 18 is driven by a cylinder 19. A double lock gate is configured to open and close.
[0029]
2 and 3, only one inner gate 15 is provided at the discharge port 6a. However, two inner gates may be provided at the discharge port 6a in a double door manner.
[0030]
With this configuration, as shown in FIG. 2, when the discharge gate 18 is closed by driving the cylinder 19, the inside of the vacuum tank 6 is hermetically sealed, so that the inner gate 15 is opened by its own weight. Solids such as rubble that have flowed down to the holding chamber 16 through the opening settle on the surface of the discharge gate 18.
[0031]
As shown in FIG. 3, when the discharge gate 18 is opened by driving the cylinder 19, the inner gate 15 is automatically closed by the atmospheric pressure entering the holding chamber 16, and the pressure in the vacuum tank 6 is kept constant. At the same time, the deposit on the surface of the gate 18 can be discharged outward by the opening of the discharge gate 18.
[0032]
Therefore, according to such a configuration, the inner gate 15 can be opened and closed automatically only by operating the cylinder 19 that opens and closes the discharge gate 18, and the pressure in the vacuum tank 6 can be kept constant. Therefore, the continuous operation of the suction device of this embodiment is possible.
[0033]
For this reason, if the discharge gate 18 is frequently opened and closed before the cement component contained in the sediment in the vacuum tank 6 of the vertical shaft is solidified, solid matter such as rubble does not accumulate in the vacuum tank 6. No need to clean.
[0034]
Furthermore, in the suction device of the present embodiment, as shown in FIG. 1, a separator 20 that separates the water and solid matter of the muddy water D is provided below the vacuum tank 6 of the shaft.
[0035]
This separator 20 separates moisture and solids such as rake by a net member, the solids are transferred to a recovery container 21, and the moisture is allowed to flow down to a water container 22 provided below the separator 20, The water container 22 is connected to the vacuum tank 6 in the vertical shaft through the pipe 23 connected to the open / close valve 23a in the middle, and the water in the container 23 is automatically sucked by the negative pressure of the vacuum tank 6 to obtain a vacuum. It can be recovered in the tank 6.
[0036]
In the above embodiment, the vertical shaft excavated in the ground is described as a vertical shaft, and a horizontal shaft is excavated at the bottom of the vertical shaft, but the present invention is limited to such a vertical shaft configuration. However, the vertical shaft may be inclined, and in any case, it can be applied to suction devices that use a pump to send muddy water from the bottom of the vertical shaft deeper than the ground to the ground. is there.
[0037]
【The invention's effect】
As explained above, according to the muddy water suction device in the underground construction of the present invention, when excavating an underground tunnel or the like, the pump built in the vacuum tank in the vertical shaft is connected to the above-described vacuum tank via a pipe. Thus, it is possible to eliminate the influence of atmospheric pressure acting on the pipe, which has been a problem in the prior art, and the pump in the vacuum tank provided in the shaft can exhibit its original ability.
[0038]
In addition, since the suction device of the present invention can be configured simply by adding a vacuum tank with a built-in pump on the ground compared to the conventional device, there is nothing particularly low in cost and hindering the vertical shaft. Contributes to securing work space.
[0039]
In addition, by making the diameter of the pipe connecting the vacuum tank in the vertical shaft and the vacuum tank on the ground smaller than the diameter of the pipe laid in the horizontal shaft, a pressure difference is created between the vacuum tank on the ground and the tank in the vertical shaft. As a result, the pumping ability of the pump can be further improved, and the pipe to be used is not a metal pipe, but a simple hose can be used.
[0040]
Furthermore, the inner gate and the discharge gate that opens and closes by driving the cylinder are provided at the discharge port of the vacuum tank in the vertical shaft, so that even during the continuous operation of the suction device of the present invention, the inside of the vacuum tank It is possible to discharge solids such as rubble that have settled inside while keeping the pressure at a constant level, so that no solid matter settles in the tank, and it is possible to save the trouble of cleaning the tank. .
[0041]
Furthermore, a separator for separating muddy water is provided downstream of the vacuum tank in the vertical shaft, and the water separated by the separator is sucked into the vacuum tank in the excavation vertical shaft and collected, thereby being separated by the separator. It is only necessary to carry out the solid material such as the reki.
[Brief description of the drawings]
FIG. 1 is a schematic view showing an embodiment of a muddy water suction device of the present invention.
FIG. 2 is a partial cross-sectional view of the vicinity of the discharge port 6a of the vacuum tank in the shaft shown in FIG. 1, showing a state in which the discharge gate 18 is closed.
FIG. 3 is a partial cross-sectional view of the vicinity of the discharge port 6a of the vacuum tank in the shaft shown in FIG. 1, showing a state in which the discharge gate 18 is opened.
FIG. 4 is a schematic view of a conventional muddy water suction device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Vertical shaft 2 ... Horizontal shaft 3 ... Bottom beam 5 ... Pump 6 in the vacuum tank of a vertical shaft ... Vacuum tank 6a of a vertical shaft ... Discharge port 7 ... Pipe 8 ... Pump 9 in a vacuum tank on the ground ... Ground Vacuum tank 10 ... pipe 11 ... vacuum pump 12 ... pipe 13 ... pipe 13a ... check valve 14 ... pipe 14a ... check valve 15 ... inner gate 16 ... reservation chamber 17 ... large diameter pipe 18 ... discharge gate 19 ... cylinder 20 ... Separator 21 ... Recovery container 22 ... Water container 23a ... Open / close valve 23 ... Pipe D ... Muddy water

Claims (4)

A vacuum pump is connected to a vacuum tank provided on the ground, and the vacuum tank on the ground is connected to a vacuum tank provided in the mine via a pipe so that the vacuum tank in the mine is negatively pressured from the vacuum tank. While sucking muddy water through a pipe connected to the side shaft, the pump built in the vacuum tank inside the mine was connected to the ground vacuum tank through a pipe to reduce the effect of atmospheric pressure on the pipe. In this state, the muddy water in the vacuum tank in the pit is sent into the ground vacuum tank, and the muddy water in the ground vacuum tank is connected to a pump built in the ground vacuum tank via a check valve. Muddy water suction device in underground construction, characterized by being sent out from The muddy water suction device for underground construction according to claim 1, wherein a diameter of a pipe connecting the vacuum tank in the pit and the vacuum tank on the ground is made smaller than a diameter of a pipe provided in the horizontal pit. A discharge port is provided on the bottom surface of the vacuum tank in the mine, an inner gate that opens and closes by its own weight is provided at the discharge port, a holding chamber is provided on the downstream side of the discharge port, and a discharge gate is provided at the discharge port of the holding chamber. 2. The muddy water suction device for underground construction according to claim 1, wherein the discharge gate is opened and closed by driving a cylinder. A separator for separating muddy water is provided downstream of a discharge port provided on a bottom surface of the vacuum tank in the mine, and water separated by the separator is sucked into the vacuum tank in the mine. Item 1. A muddy water suction device for underground construction according to item 1.

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