JPH07114882B2 - Oil recovery method and device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for tunnel or shield construction, and when a mechanical device such as a shield machine is used, oil is spilled out due to damage of the device and spillage when cleaning a floor or drainage. The present invention relates to an oil recovery method and device.

[0002]

2. Description of the Related Art Conventionally, hydraulic equipment and oil tanks have been attached to construction machines used in tunnel construction, shield construction and the like. Normally, a small amount of oil leaked from a machine was dealt with locally by wiping or an adsorption mat, when oil was floating in the drainage channel, it was collected by an adsorption mat, or treated with a neutralizer.

FIG. 7 shows a conventional oil recovery method using an oil recovery tank. When an abnormality occurs in the hydraulic system or the oil tank of the construction machine, or when the shield machine is dismantled at the arrival point, FIG. It is used when a large amount of oil flows out by cutting a hose, and the oil recovery tank a is divided into three tanks d, e, and f by partition walls b and c, and an intermediate partition g , H, i are provided.

When collecting oil, mixed drainage of spring water and oil is poured into the first tank d through the injection pipe j, and then sequentially into the second tank e and the third tank f. Due to the partition walls b and c for adjusting the water surface and the intermediate partition walls g, h, and i, the oil k is floated above the partition walls b and c based on the difference in specific gravity between water and oil, and this oil is collected manually. .

[0005]

However, in the former method, there is a lot of spring water such as in tunnels and shield construction.
When the oil leaked from the shield machine and various construction machines was drained together with the spring water, wiping and adsorption mats could not handle it, and a great deal of labor was required. In the latter case, the worker sucks up the accumulated oil in each tank, but this work requires a lot of labor, and about 60
%, 30% was recovered in the second tank, and 10% remained in the third tank, but at the end, the surface oil film could not be recovered in a thin layer and flowed out to contaminate the drainage channel.

The present invention has been proposed in view of the above problems of the prior art. The object of the present invention is to efficiently collect a large amount of oil that has flowed out, prevent contamination of drainage channels, and collect oil. An object of the present invention is to provide an oil recovery method and device that save labor.

[0007]

In order to achieve the above object, an oil recovery method according to the present invention is to collect spring water from a tunnel or shield pit and oil flowing out from a construction machine through a drainage channel and collect water at the bottom of a vertical shaft. To the precipitation tank, the oil recovery tank, the turbid water treatment tank and the pH adjusting tank, and each tank is connected to a pump up or a communicating pipe to perform turbid water treatment and oil recovery. Is configured.

The oil recovery apparatus according to the present invention comprises a precipitation tank, an oil recovery tank, a turbid water treatment tank and a pH adjusting tank which are sequentially connected to a water collection tank via a pumping means, and the oil recovery tank is provided with a partition wall. It has a plurality of dividing tanks that are equipped with an intermediate partition plate and a wave-breaking plate that extends above the tank. The oil recovery pipe is configured to pass through and each of the recovery pipes is connected to a communication pipe led to an oil recovery container.

Further, an oil recovery member with a float floats in the final dividing tank of the oil recovery device.

[0010]

Since the present invention is constructed as described above, an abnormality may occur in the hydraulic system or oil tank of the construction machine,
When disassembling the shield machine at the arrival point, if a large amount of oil flows out by cutting the hose of the hydraulic system, it will be collected with the spring through the drainage channel into the water collection tank at the bottom of the shaft, and pumped from the water collection tank. In the first settling tank, sediment and the like that have been pumped up together with oil-containing spring water are settled, and the sewage from the settling tank is made to flow to the next oil recovery tank. The oil separated in the oil recovery container is recovered through an oil recovery pipe provided at the upper part of the tank and a communication pipe connecting the same pipe and each tank.

Further, in the final divided tank of the oil recovery tank, the thin film surface oil layer is recovered by the oil recovery member with a float floating in the tank. Thus, the spring water from which the oil has been recovered is subjected to a turbid water treatment with a chemical in the next turbid water treatment tank, and the pH value of the alkali is adjusted within the drainage standard in the PH adjustment tank, and then discharged as fresh water to the outside.

[0012]

EXAMPLES In FIG. 1, 1 is a vertical shaft, 2 is a shield shaft,
Various devices of the rear equipment 3 of the shield machine are disposed in the shield pit 2, and various hydraulic devices and oil tanks (not shown) are attached to the device. Further, in the shield pit 2, a drainage channel 4 for draining spring water, and a water collection tank 5 located under the vertical pit 1
The water collecting tank 5 is pumped by a submersible pump or the like through a pumping pipe 6, and is sequentially sent to a settling tank 7, an oil recovery tank 8, a turbid water treatment tank 9, and a pH adjusting tank 10 arranged above the ground. It is designed to be used. In the figure, 11 is a connecting pipe for each tank, 1
2 is a drain pipe.

FIG. 3 shows the details of the oil recovery tank 8, which has an inflow pipe 11A from the settling tank 7 and a drain pipe B which communicates with the next turbid water treatment tank 9 and has a partition wall 12 for the first dividing tank. 8
A, a second division tank 8B, a third division tank 8C,
An intermediate partition plate 13 is arranged in each tank so as to be spaced apart from the bottom of the tank, and a wave preventing wall 14 is provided so as to prevent ripples in the upper part of each tank and facilitate separation of oil and water. .

A branch pipe 16 for recovering oil, which is diverged from a communication pipe 15, passes through the upper portion of each of the tanks 8A, 8B, 8C,
The communication pipe 15 is connected to the oil recovery container 17. In the figure, 18 is a valve, and 19 is an oil amount detection window provided in the second split tank 8B. Furthermore, an oil collecting member 20 with a float for collecting a thin oil layer on the surface floats in the third dividing tank 8C.

5 and 6 show details of the member 20,
A through hole 22 for oil inflow is formed on the outer periphery of the container 21 whose upper end surface is open.
And a ring-shaped float 23 is surrounded below the through hole 22, and the weight 2 is provided below the container 21.
4 is suspended via a suspension cord 25, and a weight 26 is placed in the container 21. The weight 26 is connected to the top of the container 21 by a hanging string 27 for easy handling. A blow pipe 28 is connected to the bottom of the container 21, and the blow pipe 28 is connected to the communication pipe 15.

The floated oil recovery member 20 floats on the water surface in the third dividing tank 3C by the operation of the weight, and only the same surface oil thin film layer 29 flows into the container 21 through the through hole 22 and blows. It is adapted to be discharged to the communication pipe 15 via the pipe 28. Regarding the structure and function of the oil recovery member 21 with flow, a patent application (the title of the invention, an oil recovery device, reference number P02-0319) is proposed.
-A).

Since the illustrated embodiment is constructed as described above, oil-containing spring water is pumped from inside the shield pit 2,
When sediment or the like in the spring water is settled in the settling tank 7 and the sewage water is sent to the oil recovery tank 8, the oil-mixed spring water is blocked by the intermediate partition plate 13 in the first dividing tank 8A, and the oil is separated. . Further, the surplus oil flows out into the next second division tank 8B, and in the same tank, the oil is separated by being blocked by the intermediate partition plate 13.

The oil stored in each of the tanks 8A and 8B is opened by opening the valve 18 of the branch pipe 16 so that the communication pipe 1
It is recovered in the oil recovery container 17 via 5. Most of the oil in the spring water is recovered in each of the tanks 8A and 8B, but the remaining oil remains as a thin film layer on the surface of the third dividing tank 8C. The oil collecting member 20 with float in FIG. 2 is taken into balance with the weights 13 and 26 and allowed to float in the tank, while the surface thin film oil layer is taken into the container 8 through the through hole 22 and is connected to the blow pipe 28. The oil is discharged to the communication pipe 15 via the hose 29 connected to 28 and collected in the oil collection container 17.

Thus, the spring water from which the oil has been recovered in the oil recovery tank 8 is subjected to the turbid water treatment with a chemical in the turbid water treatment tank 9,
Further, the pH of the alkali is adjusted within the adjustment standard in the pH adjusting tank and is discharged to the external drainage channel through the drainage pipe 12.

[0020]

According to the method of the present invention, as described above,
If an abnormality occurs in the hydraulic system or oil tank of the construction machine, or if the shield machine is dismantled at the arrival point and the hose of the hydraulic system is cut and a large amount of oil leaks out, the oil will leak along with the drainage channel. The water is collected in the water collection tank at the bottom of the shaft through the pit and is pumped up from the water collection tank.In the first settling tank, the earth and sand sucked up with the oil-containing spring water is precipitated, and the oil is collected in the next oil recovery tank. Next, the turbid water treatment tank and the PH treatment tank are sequentially subjected to turbid water treatment with a chemical agent and pH adjustment, and fresh water whose alkaline PH is adjusted within the drainage standard is discharged to the external drainage channel.

The present invention can be applied to other than the above-mentioned embodiment, for example, in a factory where a machine installation factory uses an oil recovery tank alone at the time of cleaning due to an oil leak, or other construction machines at a construction site. The oil recovery tank is also used alone. The invention of claim 2 comprises a precipitation tank, an oil recovery tank, a turbid water treatment tank, and a PH adjusting tank which are sequentially connected to a water collection tank via a pumping means, and the oil recovery tank is divided through a partition wall, and the tank It has a plurality of dividing tanks provided with an intermediate partition plate arranged at a distance from the bottom and a wave preventing plate extending above the tanks, and an oil recovery pipe is penetrated to the upper part of each dividing tank. At the same time, by connecting each of the recovery pipes to a communication pipe led to an oil recovery container to configure an oil recovery device, oil from the oil-mixed spring can be smoothly carried out, and oil recovery efficiency can be improved. It is possible to prevent pollution of drainage channels, eliminate the need for oil recovery work by many workers, and shorten the processing time. According to the invention of claim 3, the oil recovery member with a float for collecting the surface oil thin film layer is floated in the final dividing tank of the oil recovery tank, so that the thin film layer of oil remaining on the surface of the dividing tank is also recovered. The oil mixed in the spring water can be almost completely removed.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an oil recovery device according to the present invention.

FIG. 2 is a front view of an oil recovery tank.

FIG. 3 is a vertical sectional view of an oil recovery tank.

FIG. 4 is a view taken along the line EE in FIG.

FIG. 5 is a vertical sectional view of an oil recovery member with a float.

FIG. 6 is a perspective view of an oil recovery member with a float.

FIG. 7 is a vertical cross-sectional view showing a conventional oil recovery tank.

[Explanation of symbols]

 1 Vertical shaft 2 Shield shaft 4 Drainage channel 5 Water collection tank 6 Pumping pipe 7 Sedimentation tank 8 Oil recovery tank 9 Turbid water treatment tank 10 PH adjustment tank 13 Intermediate partition plate 14 Wave barrier wall 15 Communication pipe 16 Branch pipe 17 Oil recovery container 20 With float Oil recovery component

Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location C02F 1/40 B 1/66 510 K

Claims (3)

[Claims] 1. Spring water from a tunnel or shield pit and oil flowing out from a construction machine are collected in a water collecting tank at the bottom of a vertical shaft via a drainage channel, pumped from the water collecting tank, and a precipitation tank, an oil recovery tank, A method for recovering oil, which comprises sending the solution to a muddy water treatment tank and a pH adjusting tank, and connecting each of the tanks to a pump up or a communication pipe to perform muddy water treatment and oil recovery. 2. A precipitation tank, an oil recovery tank, a turbid water treatment tank, and a PH adjusting tank, which are sequentially connected to a water collection tank via a pumping means, and the oil recovery tank is divided through a partition wall and the bottom of the tank. Has a plurality of dividing tanks provided with an intermediate partition plate and a wave-proof plate extending above the tank, with an oil partition pipe penetrating in the upper part of each dividing tank, An oil recovery device, characterized in that each recovery pipe is connected to a communication pipe led to an oil recovery container. 3. The oil recovery apparatus according to claim 2, wherein an oil recovery member with a float for recovering a surface oil thin film layer is suspended in the last divided tank of the oil recovery tank.