JP3594183B2 - Construction method of FRP lining in existing steel oil storage buried tank - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention is a buried tankToIn particular, using FRP (fiber reinforced composite material)FRP lining construction method in existing steel oil storage buried tankAbout.
[0002]
[Prior art]
Today, underground oil storage tanks are widely used in gas stations and the like. However, such an underground tank may change over time due to long-term use, causing corrosion and pitting, which may cause oil leakage and the like. However, once the tank is buried, it is difficult to inspect the buried tank for corrosion and pitting from the ground.
[0003]
For this reason, a pressurization test and a decompression test have conventionally been employed to examine oil leaks in buried tanks and pipes. For example, the valve of the oil supply pipe and the suction pipe of the tank is closed, and other openings such as the ventilation pipe are also closed, and the tank is pressurized or depressurized to check for corrosion, pitting, oil leakage, and the like.
[0005]
[Problems to be solved by the invention]
In the above-mentioned conventional system, the jig for inspection has to be manufactured according to the buried tank, and the apparatus becomes large. Also, workability is poor.
[0006]
On the other hand, today, the technique of opening a buried tank has been improved, and a method has been proposed in which an opening is provided in a tank after being buried, and a manhole is formed on the opening to enter the tank. However, the work procedure and work process in the tank are not clear. In particular, lining in a buried tank using FRP (fiber reinforced composite material) is not known.
[0007]
The present invention provides a buried tank for solving the above-mentioned problems.InsideThe present invention also proposes a FRP construction and a repair / inspection process for a tank when the tank enters the tank through an opening.
[0008]
[Means for Solving the Problems]
According to the first aspect of the present invention, there is provided a process for measuring a combustible gas in a buried tank and confirming a gas concentration in the buried tank, and injecting water into the buried tank.A process of spraying an organic oil absorbing material, absorbing floating oil in the organic oil absorbing material, and discharging water from which oil has been separated into a drain through an oil / water separation tank;An opening process for forming an opening for the buried tank, and an inside of the buried tank after the opening.WashOrganic oil absorbent for sludgeAnd further diluted with water on the surfaceAdd 6% of emulsified solution and generate volatile gasKeep it low and dispose of it together with the cleaning wastewater inside the buried tankThis can be achieved by providing an FRP lining method in an existing steel oil storage buried tank that performs a process, a process of applying a primer coating in the buried tank, and a process of performing lining by FRP in the buried tank.
[0009]
Here, the buried tank used in this example is, for example, a buried tank installed in a gas station or the like, and if oil leakage occurs in such a buried tank, it causes soil contamination and is buried to prevent this. Applicable to tanks.
[0010]
The opening is formed in the upper part of the buried tank and is, for example, an opening sized so that a person can enter the buried tank.
With this configuration, for example, a person who enters through the opening cleans the inside of the buried tank, repairs and repairs the inside of the buried tank, and uses FRP (fiber reinforced composite material) in the buried tank after the repair and repair processing. Perform lining construction.
[0011]
With this configuration, lining by FRP is performed, and repair and repair of the buried tank can be ensured.
According to a second aspect of the present invention, in the invention according to the first aspect, the lining process is performed, for example, by firstly attaching the lower layer and the middle layer of the buried tank with FRP, and secondly attaching the upper layer of the buried tank with FRP. It is a configuration to wear.
[0012]
With this configuration, the FRP can be efficiently attached, and the buried tank can be repaired or repaired more reliably.
According to a third aspect of the present invention, in the invention of the second aspect, the processing of attaching the lower layer and the middle layer of the buried tank by FRP is, for example, a configuration in which a 240 ° range of the buried tank is attached by the FRP. .
[0016]
In the invention according to claim 4, the above-mentioned subject measures a combustible gas in a buried tank, confirms a gas concentration in the inside, and injects water into the buried tank.A process of spraying an organic oil absorbing material, absorbing floating oil in the organic oil absorbing material, and discharging water from which oil has been separated into a drain through an oil / water separation tank;An opening process for forming an opening for the buried tank, and an inside of the buried tank after the opening.WashOrganic oil absorbent for sludgeAnd further diluted with water on the surfaceAdd 6% of emulsified solution and generate volatile gasKeep it low and dispose of it together with the cleaning wastewater inside the buried tankThis can be achieved by providing an FRP lining construction method in an existing steel oil storage buried tank which performs a treatment, a treatment of applying a primer coating in the buried tank, and a treatment of applying and applying FRP in the buried tank.
[0017]
In this example, coating is performed by FRP in the buried tank after the repair and repair processing, and the coating is performed by, for example, applying FRP to the inside of the tank with a brush or the like, or spraying FRP on the tank inner wall with a gun spray or the like, Perform coating by FRP.
[0018]
With this configuration, the FRP layer is formed inside the tank, and the tank can be reliably repaired or repaired..
[0032]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
<First embodiment>
FIG. 1 is a diagram illustrating a lining construction structure in a tank according to the present embodiment. In the figure, reference numeral 1 denotes a buried tank buried underground such as a gas station. The buried tank 1 has an oil supply pipe 2 for filling oil (gasoline), and a suction pipe used for sucking oil (gasoline) from the buried tank 1. A pipe 3, a vent pipe 4 for ventilating the buried tank 1, and a measuring port for measuring oil (gasoline) (not shown) are provided. The buried tank 1 is buried within a predetermined depth from the ground surface, and concrete 5 is provided on the buried tank 1. The oil supply pipe 2 is provided with a valve 6, and the suction pipe 3 is provided with a valve 7. When the buried tank 1 is repaired / repaired, the valves 6 and 7 are closed.
[0033]
In the buried tank 1 having the above-described configuration, the FRP lining construction processing in the tank including the opening processing of the buried tank 1 will be described.
First, the combustible gas in the buried tank 1 is measured. In this process, the internal gas concentration and the presence or absence of leaking oil are checked by a measuring device (not shown). Here, if there is an abnormality in gas concentration or oil leakage, etc., it is immediately removed and the inside of the buried tank is brought into a safe state.
[0034]
Next, when the safety in the buried tank is confirmed by the above processing, the oil (gasoline) in the buried tank is extracted. In this work, the pipes such as the oil supply pipe 2 and the suction pipe 3 are cut off, the oil supply gauge is removed, the suction hose is inserted, and the oil (gasoline) in the tank is extracted by, for example, an air-driven pump or a pressure-resistant explosion-proof pump. Work.
[0035]
Next, the inside of the buried tank 1 is filled with water and the oil absorbing material is sprayed. After draining the oil in the tank as described above, for example, water is supplied from the oil supply pipe 2 to fill the buried tank 1 with water. The amount of this water is about half of the tank capacity, and is such that the water reaches near the center of the buried tank after filling. After the water filling, an organic oil absorbing material is sprayed, and the organic oil absorbing material absorbs floating oil. The water from which the oil has been separated is discharged into a drain via an oil / water separation tank (not shown).
[0036]
Next, a water pressure test is performed on the buried tank and each pipe. In this test, after the removal of the floating oil is completed, the inside of the buried tank is filled with water, the water pressure is increased to, for example, 0.7 kg / m, and the water pressure test of the buried tank, the water supply pipe 2, and the suction pipe 3 is performed. Investigate whether there is a leak.
[0037]
Next, the buried tank and each pipe are cut off. That is, all pipes connected to the buried tank are trimmed.
Next, the opening to be formed in the buried tank is inked, and a temporary enclosure is installed. The position of the opening formed in the buried tank is determined according to the structure diagram of the buried tank. Further, after the position of the opening is blacked out, the surrounding area is covered with a temporary fire protection fence.
[0038]
Next, the concrete 5 formed on the buried tank is removed and excavation work is performed. Here, the position of the concrete 5 is particularly indicated by 5 'in FIG. In this process, the concrete 5 'is cut along the inked line by a concrete excavator, and after cutting, the concrete 5' is crushed by a concrete breaker and the earth and sand 8 is dug down until the buried tank 1 appears.
[0039]
Next, the protective coating is removed. That is, the anti-corrosion coating applied to the tank in accordance with the opening of the buried tank 1 is removed.
Next, opening work of the buried tank 1 is performed. This opening is performed by an air cutter, and when the opening operation is completed, the water sealing bath is removed. FIG. 2 is a view showing the state of the buried tank 1 after the above-described series of operations and the vicinity thereof. In addition, 9 shown in the figure is an opening.
[0040]
When the opening operation is completed as described above, the tank is cleaned. In the tank cleaning operation, the water in the buried tank 1 is drawn by an air-driven pump or a pressure-resistant explosion-proof pump, and discharged through an oil-water separation tank. After draining, the organic oil absorbing material is sprayed on the sludge inside the buried tank 1, and a 6% emulsifying solution is further added to the surface to suppress generation of volatile gas extremely low, and to clean the inside of the buried tank 1. Dispose of it together with sewage.
[0041]
When the cleaning operation inside the buried tank 1 is completed as described above, the inside of the buried tank 1 is inspected. First, the inside of the buried tank 1 is visually inspected. This visual inspection is performed while sand blasting or wire brushing is performed over the entire inside of the buried tank 1 to reveal the background of the tank body.
[0042]
Next, a visual inspection is performed over the entire inside of the buried tank 1 to check the position, quantity, and the like of corrosion, scratches, jig marks, and the like. Here, the hole tactile measurement checks the depth, position, quantity, etc. of the hole tactile portion visually found. In the thickness measurement, the thickness of the entire interior such as the shell and the end plate is measured by an ultrasonic thickness measuring device.
[0043]
The penetrant inspection performs a penetrant inspection of the entire weld line inside the tank, a nozzle neck weld, and a damaged portion such as cracks by visual inspection.
Next, the tank is repaired and repaired. As a result of inspection and inspection of the inside of the tank, if any repair is required, based on comprehensive judgment including the construction period, such as selection of repair parts, repair method, maintenance measures, etc., specific Make a rehabilitation plan. In other words, a rehabilitation plan is established and executed by this plate welding, overlay welding, anti-corrosion coating, and other effective methods.
[0044]
Next, the FRP lining inside the tank is performed.
In the lining work in this tank, sand blasting is first performed, and then primer coating is performed. Then, after the primer coating, a predetermined number of layers are laminated using an FRP prepreg sheet, and the layer is cured by irradiating ultraviolet rays.
[0045]
FIGS. 3 and 4 are diagrams specifically showing the lining work in the tank, and are cross-sectional views of the buried tank 1. The buried tank 1 is made of a steel plate, and has been repaired as described above. A prepreg sheet of FRP is stuck inside the buried tank 1. Here, FRP (fiber-reinforced composite material) is a composite material obtained by reinforcing plastic, metal, rubber, or the like with high-strength fibers, and a glass fiber composite material, a carbon fiber composite material, or the like can be used.
[0046]
Hereinafter, a specific method of attaching the FRP will be described. First, after the primer is applied to the base as described above, the prepreg sheet 11 is applied starting from a predetermined position on the inner surface of the buried tank 1. That is, as shown in FIG. 3, an FRP (prepreg sheet) 11 is stuck 240 ° in a counterclockwise direction along the inside of the tank 1 starting from a position 10a in the buried tank 1 showing a cross-sectional shape. Paste up to 10b.
[0047]
An adhesive is applied to the FRP (prepreg sheet) 11 in advance, and the FRP (plastic sheet) 11 is peeled off and used. When sticking to the inner surface of the buried tank 1, the inner surface of the buried tank 10 is used. And a FRP (prepreg sheet) 11 so as not to generate a gas phase. In addition, the above-described attaching operation of the FRP (prepreg sheet) 11 is performed sequentially from one end to the other end in the longitudinal direction of the buried tank 1. In this way, the FRP (prepreg sheet) 11 is adhered to the middle layer and the lower layer of the buried tank 1 in a range of 240 °.
[0048]
When the application of the FRP (prepreg sheet) 11 to the middle and lower layers of the buried tank 1 is completed in this way, the upper layer of the buried tank 1 is then subjected to a bonding process.
FIG. 4 is a view for explaining the upper layer sticking process of the buried tank 1. As shown in the drawing, the FRP (prepreg sheet) 11 is stuck by the above-described processing except for the positions between the positions 10a and 10b. Therefore, in order to stick the FRP (prepreg sheet) 11 during this time, the sticking start position of the FRP (prepreg sheet) 11 is set to 10b, and the FRP (prepreg sheet) 11 is stuck to the sticking end position 10a.
[0049]
That is, the FRP (prepreg sheet) 11 is stuck in a counterclockwise direction, and the FRP (prepreg sheet) 11 is stuck to the upper layer of the embedding tank 1 within a range of 120 °.
[0050]
By performing the attaching process as described above, the FRP (prepreg sheet) 11 is attached to the entire inner peripheral surface of the buried tank 1. Then, finally, the above-mentioned FRP (prepreg sheet) 11 is irradiated with ultraviolet rays to cure the FRP (prepreg sheet) 11.
[0051]
After that, manhole installation work and the like are performed, and after the installation of the inspection port is completed, all openings of the buried tank 1 are sealed, and an airtight test is performed to perform restoration work.
As described above, according to the present embodiment, the tank enters the inside of the buried tank 1 through the opening 9, performs the lining work of the FRP shown in FIGS. 3 and 4, and repairs and repairs the buried tank 1. In addition, corrosion, pitting, oil leakage, etc. of the buried tank can be reliably repaired.
[0052]
After the repair and repair according to this example, the buried tank 1 deteriorates over time, but the progress of the deterioration is slowed by the construction of the FRP, and the buried tank 1 can be used for a long time.
[0053]
In the description of the present embodiment, the FRP 11 is constructed at the middle and lower layers of 240 °, but the construction is not necessarily 240 °. Also, the upper layer may be constructed in the remaining range.
[0054]
In the description of the above-described embodiment, the lining by FRP has been described. However, a process of applying FRP to the inner wall of the tank using a brush or the like and a process of spraying FRP on the inner wall of the tank are performed. A configuration in which an FRP layer is formed on the substrate may be adopted.
[0055]
Here, the process of applying the FRP to the inner wall of the tank using a brush or the like is, for example, a process in which an operator has a roll brush or a brush and applies the FRP to the inner wall of the tank. The process of spraying the FRP on the inner wall of the tank is, for example, a process in which an operator has a gun spray pressurized by a compressor and sprays the fluid FRP on the inner wall of the tank.
[0056]
By performing such treatment, the FRP layer can be formed on the inner wall of the buried tank 1, and the buried tank can be reliably repaired or repaired.
<Second embodiment>
Next, a second embodiment of the present invention will be described.
[0057]
This example describes not a buried tank but a ground tank. FIG. 5 shows an example of a tank arranged on the ground. For example, kerosene or the like is stored in the tank 21. The tank 21 is a steel ground tank, and the tank 21 is provided with a detection pipe 22, a lubrication unit 23, and a maintenance opening 24. Here, the detection pipe 22 is a pipe that detects the level of kerosene stored in the tank 21, and detects the amount of kerosene stored in the tank 21 using the detection sensor 25. Further, the lubricating portion 23 is an opening for injecting kerosene into the tank 21 and taking out kerosene from the tank 21. The maintenance opening 24 is an opening used for repairing and correcting corrosion and the like in the tank 21.
[0058]
The tank 21 having the above configuration is for use on the ground, and is installed, for example, on the roof of a building, in a factory, or on the site of a factory. However, there is a danger of kerosene leakage and the like due to corrosion and pitting due to aging. Therefore, as with underground tanks, reliable maintenance is required.
[0059]
Therefore, in this example, the inside of the tank 21 is also subjected to the FRP processing for the tank 21 for the ground. Hereinafter, the processing steps will be specifically described. In this example, unlike the underground tank, since it is a tank installed on the ground, removal of pavement and excavation work are unnecessary.
[0060]
First, the combustible gas in the tank 21 is measured, and the gas concentration inside the tank 21 and the presence or absence of leaking oil are checked. Next, when the safety in the tank 21 is confirmed, the oil in the tank 21 is extracted. In this operation, the detection tube 22 is removed, a hose is inserted from the lubrication unit 23, and the kerosene in the tank 21 is extracted.
[0061]
Next, water is filled in the tank 21 as described above, and an oil absorbing material is sprayed. Next, a water pressure test of the tank 21 and each pipe is performed. If the pipe is located above the ground, the water pressure test may be omitted.
[0062]
Next, the opening operation of the tank 21 is performed. Here, when the tank 21 has no opening, an opening is formed in the tank 21. In this example, since the maintenance opening 24 is already formed, the tank 21 is opened by removing a bolt and opening a lid, for example. can do.
[0063]
Next, the inside of the tank 21 is cleaned as described above, and the inside of the tank 21 is inspected. Next, the tank 21 is repaired and repaired. In this case, based on comprehensive judgment including selection of repair parts, repair method, maintenance measures, etc., including the construction period, a specific repair plan will be established according to the situation.
[0064]
Here, the FRP lining inside the tank 21 is performed. In the lining work in this tank, sand blasting is first performed, and then primer coating is performed. Then, after the primer coating, a predetermined number of layers are laminated using an FRP prepreg sheet, and the layer is cured by irradiating ultraviolet rays.
[0065]
A specific working method is the method described with reference to FIGS. That is, after the primer is applied to the base as described above, the FRP is applied starting from a predetermined position on the inner surface of the tank 21. An adhesive is applied to the FRP in advance, and the FRP is peeled off and used. When the FRP is attached to the inner surface of the tank 21, the FRP is attached so that no gas phase is generated between the inner surface of the tank 21 and the FRP. .
[0066]
By performing the adhering process as described above, the FRP is adhered to the entire inner peripheral surface of the tank 21, and finally, the FRP is irradiated with ultraviolet rays to cure the FRP. Thereafter, a recovery operation is performed, for example, an operation of installing an inspection port, a sealing operation of all openings of the tank 21, and a lid fastening operation of the maintenance opening 24.
[0067]
By performing the treatment as described above, the FRP can be stuck to the tank 21 for the ground, and the corrosion, pitting, oil leakage, and the like of the tank 21 can be reliably repaired. Further, after the repair and repair according to the present example, the tank 21 deteriorates over time, but the progress of the deterioration is slowed by the construction of the FRP, and the tank 21 can be used longer.
[0068]
In this embodiment, kerosene is stored in the tank. However, it is not limited to kerosene.
Also, in this example, the lining by FRP has been described. However, the process of applying FRP to the inner wall of the tank using a brush or the like and the process of spraying the FRP on the inner wall of the tank are performed. It is good also as a structure which forms a FRP layer inside.
[0069]
By performing such treatment, the FRP layer can be formed on the inner wall of the tank 21, and the tank disposed on the ground can be reliably repaired or repaired. <Third embodiment>
Next, a third embodiment of the present invention will be described.
[0070]
This example also relates to repair and repair of a ground tank using FRP. However, this example relates to a vertical tank as shown in FIG. In the figure, a vertical tank 26 is placed on an asphalt sand layer described later.
[0071]
Also, kerosene is stored in the tank 26 as described above. Further, also in the case of the vertical type tank 26 of this example, the detection pipe 27 and the lubrication unit 28 are provided on the upper surface. An annular plate (bottom plate) 26a is provided at the bottom of the tank 26, and a joint 26c between the annular plate (bottom plate) 26a and the side plate 26b has a configuration shown in FIG.
[0072]
FIG. 7 is an enlarged view of the joining portion 26c. The annular plate (bottom plate) 26a and the side plate 26b are fixed by welding 26d. The weld 26d is circumferentially formed along the joint 26c between the annular plate (bottom plate) 26a and the side plate 26b.
[0073]
The annular plate (bottom plate) 26a is extended outward, and the extension 26a 'is provided with a certain angle of inclination (taper). The extension 26a 'is provided to prevent rainwater from entering.
[0074]
The tank 26 is placed on the asphalt sand layer 29. In addition, the vicinity of the joint 26c between the annular plate (bottom plate) 26a and the side plate 26b is most likely to be corroded due to rainwater intrusion from the outside or sinking of the tank. .
[0075]
Hereinafter, the processing of this example will be described. First, the combustible gas in the vertical tank 26 is measured in the same manner as described above, and the internal gas concentration and the presence or absence of oil leakage are checked. Next, when the safety in the vertical type tank 26 is confirmed by the above processing, the oil in the vertical type tank 26 is extracted. In this operation, the detection tube 27 is removed, a hose is inserted from the lubrication unit 28, and kerosene in the vertical tank 26 is extracted.
[0076]
Next, water is filled in the vertical type tank 26 and an oil absorbing material is sprayed. Next, a water pressure test of the vertical tank 26 is performed.
Next, the tank 26 is opened. Here, when there is no opening in the vertical tank 26 as in this example, an opening is created in the vertical tank 26. In this case, an opening is formed on the upper surface of the vertical type tank 26. Also, this opening is an opening that at least one person puts into the tank.
[0077]
Next, the inside of the vertical tank 26 is cleaned in the same manner as described above, and the inside of the vertical tank 26 is inspected. Next, repair and repair processing of the vertical tank 26 is performed. In this case as well, the inspection is performed in accordance with the range in which repair is required based on the result of inspection and inspection of the inside of the vertical tank 26, and comprehensive judgment including selection of repair members, repair method, maintenance measures, and the like.
[0078]
Also in this example, it is assumed that FRP lining is performed inside the vertical type tank 26. In the lining work of the vertical tank 26, sandblasting is performed first, and then primer coating is performed. Then, after the primer coating, a predetermined number of layers are laminated using an FRP prepreg sheet, and the layer is cured by irradiating ultraviolet rays.
[0079]
Here, in this example, unlike the above-described buried tank 1 and ground tank 21, an FRP (prepreg sheet) is attached to the inner periphery of the vertical tank 26. In this case, the sticking process is performed from the upper inner circumference of the vertical tank 26, and the sticking portion is sequentially moved downward. Finally, an FRP (prepreg sheet) 30 is attached along a joint 26c between the annular plate (bottom plate) 26a and the side plate 26b. Also in this case, the adhesive is applied to the RP in advance, and the FRP is peeled off and used, and when the RP is attached to the joint 26c (weld 26d), the RP is bonded to the joint 26c (weld 26d). Adhere so that no gas phase is generated between FRPs.
[0080]
By performing the sticking process as described above, the FRP is stuck on the entire inner peripheral surface of the vertical tank 26, and finally, the FRP is irradiated with ultraviolet rays to cure the FRP.
[0081]
Thereafter, a recovery operation is performed, an inspection port is installed, and all openings of the vertical tank 26 are sealed.
As described above, according to the present embodiment, the FRP can also be attached to the vertical type ground tank 26, and the corrosion, pitting, oil leakage, etc. of the vertical type tank 26 can be reliably repaired. Can be.
[0082]
In particular, the bonding portion 26d, which poses a problem in the vertical tank 26, can be securely attached, and cracks and corrosion at the bonding portion 26c can be reliably prevented. The annular plate (bottom plate) 26a of this embodiment is provided with an extended portion 26a ', and the extended portion 26a' is formed with a slope (taper) having a fixed angle to reliably prevent rainwater from entering. be able to.
[0083]
In this embodiment, kerosene is stored in the tank, but the invention is not limited to kerosene. Also, in this example, the lining by FRP was described, but the process of applying FRP to the inner wall of the tank using a brush or the like and the process of spraying FRP on the inner wall of the tank were performed, and the vertical type tank was placed inside. A configuration in which an FRP layer is formed may be employed.
<Fourth embodiment>
Next, a fourth embodiment of the present invention will be described.
[0084]
In this example, the FRP is installed in a drainage ditch provided in a hazardous material handling facility such as a gas station or an inner wall of an oil-water separator.
For example, at a gas station, refueling a car, changing oil, washing a car, lubricating an underground tank, and the like are always performed, and drainage containing oil flows into a drain. For this reason, such facilities use an oil / water separator to separate oil from wastewater and discharge it to, for example, a sewage main pipe. For this reason, if there is damage such as a crack or breakage in the drainage ditch or the oil / water separator, the oil penetrates into the soil, causing soil contamination and groundwater contamination.
[0085]
Therefore, in the present embodiment, an object is to install an FRP on the inner wall of the oil / water separator or the drain to prevent contamination of soil and groundwater and to preserve the environment. Hereinafter, a specific description will be given.
[0086]
FIG. 8 is a perspective view of an oil-water separator that performs the FRP facility of the present example. In the figure, the oil / water separator 33 has a drainage inflow pipe 34 and a drainage pipe 35, and is constituted by an outer wall made of concrete or steel plate. The oil-water separator 33 is composed of three tanks. The inflow pipe 34 is attached to the side of the first tank 33a, and the discharge pipe 35 is attached to the side of the third tank 33c. A relay pipe 36 is provided between the tanks 33b, and a relay pipe 37 is provided between the second tank 33b and the third tank 33c. Note that the other end of the inflow pipe 34 is connected to a drain groove described later, and the other end of the discharge pipe 35 is connected to a sewage main pipe (not shown).
[0087]
The wastewater containing oil supplied through the inflow pipe 34 first flows into the first tank 33a and accumulates in the first tank 33a. At this time, water accumulates below and the oil floats. Therefore, it is possible to periodically drain the oil from the plug 38a installed above the wall surface of the first tank 33a. On the other hand, the drainage accumulated in the first tank 33a further flows into the second tank through the relay pipe 36, and like the first tank 33a, the water accumulates downward and the oil floats. Therefore, it is possible to periodically drain the oil from the plug 38b installed above the wall surface of the second tank 33b. Further, the wastewater accumulated in the second tank 33b flows into the third tank 33c through the relay pipe 37, and the oil floats in the third tank 33c. Therefore, it is possible to periodically drain the oil from the plug 38c installed above the wall surface of the third tank 33c.
[0088]
The wastewater from which oil has been completely removed as described above is sent from the discharge pipe 35 to the sewage main pipe. In the oil separation device 33 having such a configuration, FRP is performed on the inner walls 39a to 39c of each tank.
[0089]
In the case of this example, lining is performed, and FRP is attached to the inner walls 39a to 39c of each tank. Further, in the case of this example, the FRP is a prepreg sunsheet, which is adhered along the inner walls 39a to 39c of each tank. Further, the water level in the oil separating device 33 is below the relay pipes 36 and 37, but in this example, the oil level is adhered to the upper ends of the inner walls 39a to 39c. In the case of the existing oil-water separator, once drainage is extracted, the lower portion is adhered to FRP. In the case of a prefabricated oil / water separation device, it is also possible to perform FRP adhering work before performing work on site.
[0090]
In this example, not only the lining construction but also a method of applying FRP to the inner wall of the oil / water separator 33 using a brush or the like or a process of spraying FRP on the inner wall of the oil / water separator 33 is performed. A configuration in which an FRP layer is formed on the inner wall of the device 33 may be adopted.
[0091]
With such a configuration, it is possible to prevent oil from flowing out from the oil-water separator 33, to prevent soil contamination and groundwater contamination, and to maintain environmental protection.
[0092]
On the other hand, FIG. 9 is a view for explaining an example in which FRP is performed on the drain ditch, and is a cross-sectional view of the drain ditch. In the case of the drainage ditch, drainage ditches having various structures described below are employed. For example, FIG. 9A shows an example in which concrete and a curb block are used, in which a curb block 41 is provided inside concrete 40 and a lower surface of a drainage ditch is laid with a waterproof mortar 42. In FIG. 2B, a drain is formed by concrete 43 and waterproof mortar 44.
[0093]
Further, FIG. 4C shows a drainage groove using a U-shaped steel, which has a structure in which a U-shaped steel 46 is fixed to a groove formed by concrete 45 and a lid 47 is provided. FIG. 4D shows a structure in which a U-shaped steel 49 is fixed in a groove formed by concrete 48.
[0094]
When the FRP is performed on the drainage ditch having the above structure, the configuration shown in FIG. That is, FIG. 11E shows a configuration in which FRP is applied to the drainage groove shown in FIG. 10A, and the FRP 50 is applied to the upper surfaces of the curb block 41 and the waterproof mortar 42. FIG. 11F shows a configuration in which FRP is applied to the drainage groove shown in FIG. 10D, and an FRP 51 is applied to the inner wall of the U-shaped steel 49.
[0095]
In this embodiment, the method of applying the FRP to the curb block or the U-shaped steel using a brush or the like using a brush or the like, or the process of spraying the FRP to form the FRP layer, without being limited to the lining construction. It may be.
[0096]
Although not shown, the same can be applied to the case where the FRP is performed on the drainage ditch shown in FIGS.
With this configuration, even if there is a crack, damage, corrosion, or the like in the waterproof mortar, the outflow of oil can be prevented by the FRP.
[0097]
FIG. 10 shows an example in which the FRP is applied to the car wash pit, and the FRP is applied to the entire inner surface of the outer wall of the car wash pit 53. In this case, the outer wall of the car wash pit 53 is formed of concrete 55, and a lid 56 is provided.
[0098]
By configuring the car wash pit 53 in this manner, oil spill can be prevented from cracking, damage, corrosion and the like of the concrete 55.
[0099]
【The invention's effect】
As described above, according to the present invention, since the inside of the tank is subjected to lining by FRP, it is possible to reliably repair and repair the buried tank. Therefore, it is possible to extend the service period of the buried tank thereafter.
[0100]
Further, by applying a tank for lining construction by FRP to an underground tank, a ground tank, or a vertical tank, the tank can be used for a wider range of tanks.
[0101]
In addition, by performing the FRP on the inner wall of the tank by various methods, it is possible to select a work that is easier to perform.
Further, according to the present invention, an FRP is installed on the inner wall of the oil / water separator or the drainage ditch, thereby preventing soil and groundwater contamination and environmental protection.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a buried tank explaining a first embodiment.
FIG. 2 is a cross-sectional view of the buried tank of the first embodiment after the tank is opened.
FIG. 3 is a diagram illustrating an FRP lining construction process in a tank.
FIG. 4 is a diagram illustrating an FRP lining construction process in a tank.
FIG. 5 is a sectional view of a buried tank illustrating a second embodiment.
FIG. 6 is a sectional view of a buried tank explaining a third embodiment.
FIG. 7 is an enlarged cross-sectional view of the vicinity of a joint of a buried tank illustrating a third embodiment.
FIG. 8 is a cross-sectional view of an oil separation device illustrating a fourth embodiment.
FIG. 9 is a cross-sectional view of various drainage grooves for explaining a fourth embodiment.
FIG. 10 is a sectional view of a car wash pit illustrating a fourth embodiment.
[Explanation of symbols]
1 buried tank
2 Oil supply pipe
3 Suction tube
4 Ventilation pipe
5 concrete
6, 7 valve
8 earth and sand
9 Opening
10a, 10b position
11 FRP (prepreg sheet)
21 tank
22 Detector tube
23 Lubrication part
24 Maintenance opening
25 Vertical type tank
25a Annular plate (bottom plate)
25b Side plate
25c joint
25d weld
25a 'extension
27 Detector tube
28 Lubrication part
29 Asphalt sand layer
30 FRP
33 Oil / water separator
33a First tank
33b 2nd tank
33c Third tank
34 Inflow pipe
35 Discharge pipe
36, 37 Relay pipe
38a-38c stopper
39a-39c inner wall
40 concrete
41 Curb Block
42 Waterproof mortar
43 concrete
44 Waterproof mortar
45 concrete
46 U-shaped steel
47 lid
48 concrete
49 U-shaped steel
50 FRP
51 FRP
53 Car wash pit
54 FRP construction
55 concrete
56 lid

Claims (4)

Measuring the combustible gas in the buried tank and checking the gas concentration inside,
A process of injecting water into the buried tank, spraying an organic oil absorbent, absorbing floating oil in the organic oil absorbent, and discharging the separated water into a drain through an oil / water separator.
Opening processing for forming an opening for the buried tank;
The inside of the buried tank after the opening is washed , an organic oil absorbing material is sprayed on the sludge, and a 6% emulsified solution diluted with water is further added to the surface to suppress the generation of volatile gas . A process to collectively dispose together with the cleaning sewage ,
A process of applying a primer coating in the buried tank,
A process of performing lining by FRP in the buried tank;
FRP lining construction method in existing steel oil storage buried tank, characterized by performing. 2. The existing steel storage tank according to claim 1, wherein the lining processing firstly includes lining a lower portion and an intermediate portion of the buried tank by the FRP, and secondly lining an upper portion of the buried tank by FRP. 3. FRP lining construction method in a buried tank. 3. The FRP in an existing steel oil storage buried tank according to claim 2, wherein the processing of lining the lower part and the middle part of the buried tank with the FRP is performed by lining the area of 240 degrees of the buried tank with the FRP. Lining construction method. Measuring the combustible gas in the buried tank and checking the gas concentration inside,
A process of injecting water into the buried tank, spraying an organic oil absorbent, absorbing floating oil in the organic oil absorbent, and discharging the separated water into a drain through an oil / water separator.
Opening processing for forming an opening for the buried tank;
The inside of the buried tank after the opening is washed , an organic oil absorbing material is sprayed on the sludge, and a 6% emulsified solution diluted with water is further added to the surface to suppress the generation of volatile gas . A process to collectively dispose together with the cleaning sewage ,
A process of applying a primer coating in the buried tank,
A process of performing application by FRP in the buried tank;
FRP lining construction method in existing steel oil storage buried tank, characterized by performing.

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