JP3497116B2 - Spring water filtration method and apparatus - 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 water filtering method and device for filtering spring water generated during excavation in a tunnel pit.

[0002]

2. Description of the Related Art As a method for excavating a tunnel, there is known a method in which a rock drill is used to dig a hole in the bedrock, a dynamite powder is set, and the bedrock is broken. In this excavation method, the support work is assembled along the tunnel in the excavated tunnel, and mortar is sprayed on the tunnel skin surface including the support work to harden the surface and prevent the collapse of the tunnel. Along with the application, gutters for drainage are provided at both corners of the tunnel.

[0003]

By the way, when excavating by the above-mentioned construction method, spring water is generated as the excavation progresses, but if the spring water is too much, the excavation work is stopped, and the spring water is waited for a long time until it stops to some extent. It may be unavoidable and, at times, may involve the risk of collapse. Therefore, excavation work will be significantly delayed.

Further, when spring water comes out, the turbid water is made to flow into the gutter of the tunnel, and the water is filtered by a filtering device provided on the way and drained. This is because if turbid water is allowed to flow downstream, it will pollute the river and destroy the natural environment. However, since the spring water once generated flows as muddy water, it is necessary to have a certain filtration speed when filtering this with a filtration device. Therefore, the filtration device must have oxygen gas, dilute sulfuric acid, or a polymeric flocculant. , It is necessary to use other chemicals for a short period of time for filtration so that spring water can be dealt with. The larger the amount of spring water, the higher the processing capacity of the filtration device must be.

In view of the above problems, the present invention shortens the time to stop and wait for excavation work due to spring water generated depending on the place during tunnel excavation, and after the spring water is filtered as fresh water, the gutter is An object of the present invention is to obtain a spring water filtration treatment method and device.

[0006]

As a means for solving the above-mentioned problems, the present invention is provided when excavating inside a tunnel pit.
In the spring filtration method of filtering the spring water, drilling holes at or near the spring point generated in the excavated tunnel, and the outer periphery of the strainer pipe with a filter material that does not affect the surrounding soil. The enclosed filtration means is attached to the drilling hole, and the spring water is filtered by this filtration means to make fresh water, and the fresh water is sucked at a predetermined suction pressure and discharged to the gutter. It was a method.

In the above treatment method, a drilling hole is provided at an arbitrary position near or at the spring point, and the filtering means is mounted there. Therefore, the spring water is filtered by the filtering means, sucked at a predetermined suction pressure, and taken out as fresh water to the outside. For this reason,
The spring water is collected from the surroundings at the position where the filtering means is provided,
Since it is sucked and discharged, the spring water will be discharged in a short time. Further, since the water is treated through the filtering means, the spring water does not flow as turbid water.

As an apparatus for implementing the above processing method ,
Filtration to process spring water generated during excavation in the tunnel
In the processing equipment, drill holes drilled at or near the spring point in the excavated tunnel are surrounded by a filter medium of spring water that does not affect the surrounding soil, and a strainer pipe is combined inside. The strainer pipe is provided with a plurality of slits on the outer circumference of the strainer pipe, and fresh water obtained by filtering the spring water with a filter medium is sucked at a predetermined suction pressure by a suction device connected to the strainer pipe to generate the spring water. It is possible to employ a spring filtration device that discharges water as fresh water to the gutter.

In this apparatus, fresh water treated with a filter medium is taken into the strainer pipe, and the suction device connected to the strainer pipe draws the fresh water to the outside by a predetermined suction pressure. Therefore, spring water is rapidly collected and discharged in a short time.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a schematic view of a spring water filtration treatment apparatus according to an embodiment. As shown in the figure, the spring water filtration device is connected to a filter means 10 formed by combining a filter material for spring water and a strainer (filter) pipe, and to suck filtered fresh water from the filter means 10. Suction device 20
It has and. The filtering means 10 is, as shown in FIG.
Silica sand is filled as a filtering material 12 into a drilled hole 11 drilled at a spring point in the tunnel T or an arbitrary point in the vicinity thereof, and double strainer tubes 13 and 14 are provided therein.

As shown in the drawing, the drilled hole 11 is formed by excavating the back side in an inclined shape with a slight downward slope by a horizontal punching boring machine. As an example, the hole 11 shown has a diameter of 13
Although it is 8 mmφ, a suitable diameter of about 138 to 160 mm may be used. The length shall be the limit length that can be excavated by the boring machine. The filter material 12 is not limited to silica sand, and may be a material having a filtering function equal to or higher than that of silica sand, as long as it does not affect the surrounding soil even when left standing. Of the double strainer pipes, the outer strainer pipe 13 is made of a steel pipe to protect the inner strainer pipe 14, and a large number of slits 13a are provided on the outer periphery of the strainer pipe at an appropriate pitch and length. The strainer pipe 13 has a diameter of 80 m in the illustrated example.
mφ and the slit 13a are 2.5 mm wide and 150 mm long.

The tip of the outer strainer tube 13 is closed, the opposite end is covered by a cap 13b, and the inner strainer tube 14 is inserted through the cap 13b. The strainer pipe 14 is made of vinyl chloride material, and has a diameter of 40 mmφ in the illustrated example.
The length is slightly shorter than the outer strainer tube 12. The strainer tube 14 also has a large number of slits 14 with an appropriate pitch and length.
a is provided, the slit 14a has a width of 1.5 mm,
It is 100 mm long.

The protruding end of the strainer pipe 14 has a regulating valve 2
It is connected to the connecting pipe 21 via 1v, and the connecting pipe 21 is connected to the suction pump 22. The pump capacity is set based on experience considering the maximum water flow. Therefore, a suction pump 22 having a pump horsepower and a head suitable for this capacity and a motor 23 for driving the suction pump 22 are selected. Suction pump 2
A regulating valve 24 is also provided on the discharge side of 2, and the regulating valve 24
The fresh water is discharged to the discharge pipe 25 so that the amount of spring water on the suction side and the amount of discharge on the suction side can be adjusted with. The end of the discharge pipe 25 is provided so as to drain into the side groove ST.

FIG. 5 shows a procedure for assembling the spring water filtration treatment device having the above structure. First, as shown in FIG.
The inner wall is drilled by a boring machine to the drilling limit to form the drilled hole 11. (B) As shown in the figure, the slit tube 13 having a length corresponding to the drilled hole 11 is inserted into the drilled hole 11. Then, as shown in (c), the space between the drilled hole 11 and the slit tube 13 is filled with silica sand of the filter medium 12, and another slit tube 14 is inserted inside the slit tube 13 as shown in (d). Then, the end is closed with the cap 13b. Furthermore, slit tube 1
When the regulating valve 21v of the suction device 20 is connected to the protruding end of No. 4, the connecting pipe 21 is connected to the suction pump 22 and the suction device 20 is connected, the spring water filtration treatment device is at a desired position at or near the spring point. Will be installed.

In the filtering means 10 of the processing apparatus installed as described above, the spring water is filtered through silica sand as the filtering material to become fresh water, and passes through the slit 13a of the strainer pipe 13 to enter the inside thereof. Further, this fresh water passes through the slit 14a of the inner strainer pipe 14 and enters the inside thereof. Therefore, in the initial state, the outside air is sufficiently removed in advance so that the outside air does not enter between the filtering means 10 and the suction pump 22.

When the preparation of the processing device is completed in this way, the motor 23 is activated and the strainer pipe 1 is driven by the suction pump 22.
Aspirate the clear water in 4. Suction is performed by adjusting valves 21v and 24 while maintaining balance with spring water, and the sucked fresh water is flowed from the discharge pipe 25 to the side groove. Thus the suction pump 22
By continuously sucking the spring water and discharging it as fresh water, the spring water is collected from the surroundings at the point where the filtering means 10 is provided, and is forcibly sucked and discharged, so that the spring water naturally flows out. The amount of spring water is below a predetermined level in a much shorter time than waiting for the operation, and the tunnel excavation work can be efficiently advanced to the next stage. In addition, since spring water is filtered and discharged as fresh water, even if it flows into the river from the gutter, it is treated without polluting the natural environment.

In the above-mentioned embodiment, the example in which the spring water filtering device is provided only at or near the spring point in the tunnel has been described. However, when there are a plurality of spring points, the filtering means is provided at a plurality of points. You may provide 10 respectively. In that case, the suction device 20 may be connected to each of the plurality of filtering means 10, 10 ... Or a single set of common suction device 20 may be connected. Further, although the drilling hole 11 is inclined slightly downward when the filtering means 10 is provided, the direction in which the drilling hole 11 is provided is arbitrary and is not necessarily limited to the downward direction.

[0018]

As described above in detail, in the spring water filtration method and device of the present invention, a filter material is loaded into a drilled hole at a spring point in a tunnel or at an arbitrary position in the vicinity thereof, As a result, the filtered fresh water is collected at the drilling position and sucked at a predetermined suction pressure to be taken out, so that the spring water is concentrated and collected at the installation point within the tunnel in a short time and purified as clear water. Since the spring water can be filtered and treated without being polluted with the natural environment after being treated and flowed into the gutter, the effect of efficiently promoting excavation work can be obtained. Further, the processing apparatus has the advantages that the mechanism is simple and simple, no conventional chemicals are required, and the cost is low.

[Brief description of drawings]

FIG. 1 is an overall schematic view of a state in which a spring filtration device according to an embodiment is installed in a tunnel T.

FIG. 2 is a main configuration diagram of the processing device of the above.

FIG. 3 is a sectional view of a filtering means.

FIG. 4 is a sectional view taken along the line IV-IV in FIG.

FIG. 5 is an explanatory view of an assembling procedure of the filtering means.

[Explanation of symbols]

10 Filtering means 11 Drilling 12 Filter media 13, 14 strainer tube 13a, 14a slit 20 Suction device 22 Suction pump 25 discharge pipe ST gutter

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI B01D 29/10 520Z 530Z

Claims (4)

(57) [Claims] 1. Spring water generated during excavation in a tunnel mine
In the spring water filtration method of filtering, a drilling hole is drilled at or near the spring point generated in the excavated tunnel,
The filtering means that surrounds the outer circumference of the strainer pipe with a filtering material that does not affect the surrounding soil is attached to the drilling hole, the spring water is filtered by this filtering means to make fresh water, and the fresh water is sucked at a predetermined suction pressure. Then , the spring water filtration treatment method is characterized in that it is discharged to the gutter. 2. Spring water generated during excavation in a tunnel mine
In a spring water filtration device for filtering, drill holes drilled at or near the spring point formed in the excavated tunnel are surrounded by a filter material that does not affect the surrounding soil, and a strainer pipe is placed inside The strainer pipe is provided with a plurality of slits on the outer circumference of the strainer pipe, and fresh water obtained by filtering spring water with a filter medium is sucked at a predetermined suction pressure by a suction device connected to the strainer pipe. However , the spring water is discharged as fresh water to the gutter .
Spring water filtration processing apparatus that. 3. The spring filtration apparatus according to claim 2, wherein the filter material is silica sand. 4. The spring water filtration treatment device according to claim 2, wherein the strainer pipe is provided inside and outside twice.