JPH0712585U - Precast oil / water separation tank - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a precast oil-water separation tank that is easy to transport and hold horizontally in the field in order to shorten the construction period of the oil-water separation tank. [Structure] An oil-water separation tank 10 is prefabricated with concrete in a factory, with an outer frame 1 having an open upper end 4 and a lower end 5 and a partition wall 7 partitioning the inside of the outer frame 1. Since the bottom surface may be cast with invert concrete on site, the weight of the oil / water separation tank 10 can be reduced. Further, in order to make the partition wall 7 thin, the communication pipe 40 is buried at the time of prefabrication, thereby eliminating the on-site hanging work.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a gravity type oil / water separation tank which is suitable for separating waste oil discharged from an oil storage, a gas station, a kitchen, etc. and has a simple structure.

[0002]

[Prior art]

 It is necessary to install an oil / water separation tank in equipment such as gas stations where waste oil may flow out so that the waste oil does not flow into wastewater treatment equipment such as wastewater. Oil-water separation tanks are mostly buried because of the relationship with the level at which wastewater flows. Then, in consideration of load conditions, fire, and strength when cleaning the interior, etc., it is general to carry out concrete construction.

The oil-water separation tank is generally 1 to 1.5 m deep and has 3 to 4 pits each having an opening size of about 80 × 80 cm. Conventionally, after excavating a site, a formwork that matches these dimensions is assembled and concrete is placed on site to form the pits with the above dimensions. In addition, the oil-water separation tank is often installed under the concrete floor of a gas station, for example. In this case, the upper end of the oil / water separation tank is constructed on-site in accordance with the draining slope of the concrete floor, and a lid made of iron plate or the like is installed on it.

[0004]

[Problems to be solved by the device]

 It takes about one week from the time of excavation to put the above oil-water separation tank on site. During this time, work on the top, such as placing concrete floors, is not possible. Therefore, if a prefabricated oil-water separation tank is installed, the steps of assembling and disassembling the formwork and the steps of placing concrete and curing it can be omitted, and the start time of other work can be greatly reduced. You can speed it up. There is a great merit in shortening the on-site process. In addition, since the amount of work in the excavated ground is reduced, there is a great merit in reducing the labor of workers and preventing danger.

However, in consideration of fire prevention, load conditions applied to the upper part, and strength during cleaning work in the oil / water separation tank, it is a problem at present to manufacture the oil / water separation tank with a light material such as FRP. . Therefore, it is conceivable to prefabricate the oil-water separation tank made of concrete, that is, to precast it.However, even if the pit of the conventional size is prefabricated as it is, the weight will be too large during transportation and the transportation cost will increase. There is a problem that it will end up.

In order to deal with this problem, it is conceivable to use GRC (glass fiber reinforced concrete) or the like to reduce the wall thickness and reduce the weight. However, if the partition wall that forms multiple oil-water separation tanks is thinned, it will be difficult to install a communication pipe that connects between the multiple pits of the oil-water separation tank. That is, if a wall is installed to install a communication pipe on site, the wall is too thin and cracks or cracks occur in a larger area than necessary, making it difficult to secure the communication pipe. It is difficult to finish after doing.

Furthermore, if a concrete pit is cast on site, the upper end of the concrete pit can be easily adjusted according to the draining gradient of the floor. However, in the case of the pre-fabricated factory, after setting up the prefabricated pit, it takes time and effort to place on-site concrete at the upper part of the pit according to the drainage control. Therefore, in order to make the most of the merit of shortening the on-site process, factory prefabricated products that can be easily applied to drainage gradients are required.

The present invention is intended to solve the above problems, and for that reason, a precast oil-water separation tank that can significantly reduce the construction process in the field and can be made lightweight. It is intended to be provided.

[0009]

[Means for Solving the Problems]

 Therefore, the oil / water separation tank according to the present invention is a precast product prefabricated in the factory, and is different from the conventional oil / water separation tank constructed in the field. In order to reduce the transportation cost from the factory to the site and facilitate horizontal holding at the site or factory, the oil-water separation tank according to the present invention has at least a part of the lower end as an open end, and the oil-water separation tank The bottom surface is not completely formed at the factory stage, and the weight of the oil / water separation tank is being reduced. The bottom surface of the oil / water separation tank may also be used as a leveling concrete surface for leveling when installing the oil / water separation tank, or an invert concrete may be placed at the lower end of the oil / water separation tank after installation. good. In addition, at least a part of the upper end of the oil-water separation tank is usually open for maintenance after installation.

Since the substantially cylindrical concrete outer frame that constitutes the outer frame of the oil / water separation tank according to the present invention is reinforced by the partition wall provided to form a plurality of sections for the oil / water separation box. The strength during transportation and burial can be secured. Therefore, no reinforcing material is required for transportation, and the precast oil-water separation tank according to the present invention can be buried in the tank. Since the communication pipe made of resin is buried in the partition wall during precasting, it is not necessary to hang the partition wall on site. Therefore, the wall thickness of the partition wall can be minimized and the weight can be reduced. Furthermore, by making the length of the buried resin communication pipe approximately the same as the wall thickness, the length protruding from the partition wall can be shortened to allow communication during transportation or installation at the site. Prevents damage to the tube. The rising pipe required for gravity separation of oil water can be easily inserted into this communication pipe at the site, and can be fixed by a method such as adhesion or welding.

As described above, the precast type oil-water separation tank according to the present invention is light in weight while maintaining necessary strength, enables transportation at low cost, and facilitates on-site construction and construction period. Is being shortened.

Further, it is possible to install a lid hanging frame on the upper end of the outer frame through a plurality of height adjusting means. Thus, the height adjusting means can be adjusted to freely set the inclination of the lid hanging frame. Therefore, even if the draining slope is provided on the upper concrete floor where the oil / water separation tank is buried, the slope of the lid installed in the oil / water separation tank according to the present invention can be easily adapted to the draining slope. Is possible. As described above, the precast oil-water separation tank according to the present invention can set the draining gradient to the upper part in a short time even if the product is prefabricated at the factory.

As such height adjusting means, it is preferable to use a plate member fixed to the lid hanging frame, and the plate member having a long hole screwed to the upper portion of the outer frame. it can. Further, as the above-mentioned communicating pipe, it is desirable that a protruding portion to be embedded in the partition wall is formed along the outer periphery thereof.

[0014]

【Example】

 An embodiment of an oil / water separation tank according to the present invention will be described below with reference to the drawings. FIG. 1 shows an outline of an oil / water separation tank according to an embodiment, and its cross section is shown in FIG. The oil-water separation tank 10 of this example is formed from a substantially rectangular parallelepiped concrete outer frame 1 precast in a factory, and the inside thereof is partitioned by three precast partition walls 7a to 7c made of concrete. Has been. The partition walls 7a to 7c are formed from the upper end 4 to the lower end 5 of the outer frame 1 so as to connect the longitudinal side walls 2a and 2b of the outer frame 1. The partition walls 7a to 7c form four equally sized sections 15a to 15d. Since the upper and lower ends 4 and 5 of the outer frame 1 are not formed with a bottom surface and an upper surface, the upper and lower ends of each of the sections 15a to 15d are open. An iron lid hanging frame 20 is connected to the upper part of the outer frame 1 through a level adjusting mechanism 30, and four iron lids 29 corresponding to each pit are installed in the lid hanging frame 20.

Beam portions 6 made of thick concrete are formed on the outer peripheral portions of the four side surfaces 2 and 3 of the outer frame 1 to ensure necessary strength. Further, an opening region 8 having a thin wall surface is prepared on the upper portions of the side surface 2a and the side surface 3b, and this opening region 8 is used for connecting a drain pipe as described later. A communication pipe 40 made of vinyl chloride is embedded in the upper part of each of the partition walls 7a to 7c, and the sections 15a to 15d are connected to each other via the communication pipe 40. Further, two inserts 50 for female threads are embedded in each of the beam portions 6 forming the upper ends of the side surfaces 2a and 2b.

The lid hanging frame 20 is formed by assembling an angle member 21 in a substantially rectangular shape corresponding to the upper end 4 of the outer frame 1, and a flat bar 22 serving as a lid hanging is attached thereon. Further, the flat bar 23 is also attached at a position corresponding to each of the partition walls 7a to 7c. Two level adjusting mechanisms 30 are attached to each of the angle members corresponding to the long side surfaces 2a and 2b of the angle member 21. The level adjusting mechanism 30, which will be described in detail later, has a flat bar 31 and an elongated hole 32 formed therein. The level adjusting mechanism 30 is fixed to the insert 50 embedded in the outer frame 1 by a bolt 55 inserted into the elongated hole 32 at a position having an appropriate height.

A process of installing the oil / water separation tank 10 of this example will be described with reference to FIGS. 3 to 7. First, as shown in FIG. 3, the place where the oil-water separation tank 10 of this example is installed is excavated, and crushed stones 16 are set. After that, the waste concrete 17 is poured to reach a predetermined level. The oil / water separation tank 10 is installed on the waste concrete 17, and the wedge 18 or the like is used for further leveling.

Next, as shown in FIG. 4, an invert concrete 19 of about 50 mm is placed at the lower ends 5 of the pits 15a to 15d of the oil / water separation tank 10 installed at a predetermined level. Further, the rising pipe 45 is attached to the communication pipe 40 embedded in each of the partition walls 7a to 7c. In this example, as the rising pipe 45, a vinyl chloride pipe made of the same material as the communication pipe 40 can be adopted. The ascending pipe 45 is composed of a vertical pipe 46 extending upward from the bottom surface 11 formed by the invert concrete 19 along the partition wall 7 and an elbow 47 connecting the vertical pipe 46 to the communication pipe 40. One end is a socket and can be inserted into the communication pipe 40. The inserted elbow 47 is fixed to the communication pipe 40 by an adhesive or PVC welding.

FIG. 6 shows details of the communication pipe 40 and the elbow 47. The communication pipe 40 is a short pipe having a length substantially equal to the thickness of the partition wall 7, and a protrusion 41 is formed in the middle thereof. The projection 41 is formed along the outer circumference of the communication pipe 40 over the entire circumference. The communication pipe 40 is previously embedded in the partition wall 7 when the oil-water separation tank 10 is prefabricated in the factory. Therefore, in the field, if the socket side of the elbow 47 is inserted into the communication pipe 40, the rising pipe 45 can be easily attached to the oil / water separation tank 10. Since it is not necessary to suspend the partition wall 7 and prepare a space through which the pipe penetrates as in the conventional case, there is no concern that cracks or cracks will occur in the partition wall 7 due to the suspension. Therefore, the thickness of the partition wall 7 can be suppressed to the minimum necessary for strength.

Further, since the area of attachment between the partition wall 47 and the communication pipe 40 is increased by the projection 41 provided on the communication pipe 40, the load of the rising pipe 45 is dispersed and transmitted to the partition wall 7. Therefore, it is not necessary to partially thicken the cross section of the partition wall 7 in order to support the load of the rising pipe 45. By thus burying the communication pipe 40 in the partition wall 7 in advance, the thickness of the partition wall 7 can be minimized and the weight of the oil / water separation tank 10 can be reduced. ing.

Further, even if a minute crack is generated on one surface of the partition wall 7 along the communication pipe 40, the projection 41 formed on the communication pipe 40 prevents the crack from spreading to the other surface. R. Therefore, there is also an effect of preventing water or separated oil from leaking to the adjacent pit 15 along the communication pipe 40. In addition, since the length of the communication pipe of this example is set to be approximately the same as the wall thickness, the communication pipe is prevented from swaying during transporting or the like, and unnecessary stress is applied to the partition wall to prevent damage. Furthermore, since the length of the communication pipe is shortened, the weight during transportation is reduced.

Similar to the ascending pipe 45, a drain pipe 44 as shown in FIG. 4 is attached to the fourth pit 15d. The drainage pipe 44 is for guiding the drainage after the oil / water separation to a drainage port for public sewage or the like. Since the mounting position of the drainage pipe 44 is determined by the positional relationship between the oil / water separation tank 10 and the drainage port, in the oil / water separation tank 10 of this example, the communication pipe is not embedded in advance but the side surface 2a of the outer frame 1 is used. A thin and rectangular opening area 8 is provided in and 3b. Therefore, it suffices to suspend the open area 8 on the side surface in an appropriate direction in the field, attach the drainage pipe 44, and fix it with mortar or the like. Since the side faces 2 and 3 of the outer frame 1 are thicker than the partition wall 7 in terms of strength, cracks and cracks due to chipping do not spread. Therefore, providing the thin-walled opening region 8 as in this example has the effect of shortening the work at the site. Of course, it is also possible to embed the communication pipe 40 at a predetermined position on the side surfaces 2 and 3 like the partition wall. In that case, it is desirable to embed a communication pipe shorter than the wall thickness of the side surfaces 2 and 3 on the side surface and cover it with a thin concrete film. This is because there is no risk of water leaks if a communication pipe in the required direction is used and other unnecessary communication pipes are covered with concrete depending on the positional relationship with the drainage port.

After the pipes have been installed in this way, but of course before installation, the lid hanging frame 20 is installed on the upper end of the oil-water separation tank 10. The installation of the lid hanging frame 20 will be described based on FIG. 5 showing a cross section in the lateral direction. The floor 60 embedded in the oil / water separation tank 10 is, for example, a work area of a gas station. Since the floor 60 in such an area is generally provided with a drainage gradient, the lid of the oil / water separation tank 10 must be installed in accordance with this drainage gradient. If the lid is installed horizontally with respect to the draining slope, a step with the floor 60 will be dangerous, and draining will not be performed smoothly. In the floor 60 of this example, a draining slope is provided from the side surface 2a of the outer frame 1 toward the side surface 2b. In order to match this gradient, the lid hanging frame 20 has the length of the level adjusting mechanism 30 attached to the side surface 2a increased and the length of the level adjusting mechanism 30 attached to the side surface 2b shortened to separate the oil and water. It is installed in tank 10. By placing the lid 29 on the lid hanging frame 20 thus installed with a gradient, the lid can be attached along the water gradient formed on the floor 60.

FIG. 7 shows details of the level adjusting mechanism 30 of this example. The level adjusting mechanism 30 of this example uses a flat bar 31 having an elongated hole 32, and the height can be adjusted by making the fixing position variable. The flat bar 31 is fixed by a bolt nut 34 to a short angle member 33 welded to the angle 21 of the lid hanging frame 20. The elongated hole 32 formed in the flat bar 31 can be fixed to the insert 50 pre-embedded in the upper end 4 of the outer frame 1 by a bolt 55 at an appropriate position. Therefore, it is possible to freely adjust the height from the insert 50 to the lid-supporting angle 21 within the range of the elongated hole 32. As shown in FIG. 5, when the draining gradient is prepared along the short direction of the oil / water separation tank 10, the length of the level adjusting mechanism 30 mounted on the side surfaces 2a and 2b may be changed. On the other hand, when a draining gradient is prepared along the longitudinal direction of the oil / water separation tank 10, the heights of the two level adjusting mechanisms 30 mounted on the side surfaces 2a and 2b may be changed. Further, fine adjustment of the burial depth of the oil / water separation tank 10 and the level of the floor 60 can be performed by the level adjusting mechanism 30.

Since the oil-water separation tank 10 of this example is prefabricated at the factory, by fixing the lid hanging frame by using the level adjusting mechanism as described above, it is possible to adapt it to the level of the floor cast in situ. There is. In the conventional cast-in-place oil-water separation tank, it was possible to assemble the formwork according to the floor level and place it at an appropriate height or at the end of the slope, but even in that case fine adjustment In order to do this, it was necessary to adjust the height by scraping the ends or by finishing with mortar. In the oil / water separation tank 10 of this example, it is possible to adjust the floor level very easily by using bolts or the like.

FIG. 8 shows the oil-water separation tank that has been installed. In the oil-water separation tank 10 of this example, the bottoms 11 are formed by the invert concrete 19 in the sections 15a to 15d partitioned by the partition walls 7a to 7c, respectively, to form independent pits (oil / water cells). Wastewater mixed with oil water is introduced into the first pit 15a through the introduction pipe 43. The introduction pipe 43 may be installed so as to penetrate the lid 29, may be installed so as to penetrate the outer frame, or the drainage may be introduced into the pit 15a with a structure such as a side groove. In the drainage mixed with the oil and water introduced into the pit 15a, the oil having a low specific gravity is separated into the upper part and the water is separated into the lower part. The water separated into the lower part is guided to the adjacent pit 15b through the rising pipe 45. In the pit 15b as well, as in the case of the pit 15a, the oil content and the water content are separated by gravity, and the water content is guided to the adjacent pit 15c. In the pits 15c and 15d as well, the oil is similarly gravity-separated, and the water is finally discharged from the pit 15d through the drainage pipe 44 to the drainage port.

As described above, the oil-water separation tank 10 of this example is prefabricated in the factory and can be transported to the site. Therefore, it is important to reduce transportation costs and facilitate horizontal holding, and for that purpose it is necessary to reduce weight. Since the outer frame 1 and the partition wall 7 of the oil / water separation tank 10 of this example are precast by GRC (glass fiber reinforced concrete), it is possible to obtain the required strength even if the wall surface is thin. In the partition wall 7 where the wall thickness is a problem, the communication pipe 40 is buried at the time of prefabricating the factory, eliminating the work of hanging on site. Further, since this partition wall 7 also has a function of supporting the outer frame 1 during transportation or installation, it is not necessary to reinforce the outer frame during transportation. In addition, the bottom surface is opened during transportation or installation, reducing weight. The bottom surface can be easily constructed locally by using invert concrete. In addition, the adjustment with the cast-in-place floor, which tends to be a problem when prefabricated, is solved by installing a lid hanging frame through a level adjustment mechanism. Therefore, since the oil-water separation tank 10 of this example is used for the construction, the construction period can be shortened significantly. In addition, since there is very little work during excavation, such as assembling and disassembling formwork, the labor of the worker can be reduced and danger can be prevented.

[0028]

[Effect of device]

 As described above, the precast type oil-water separation tank according to the present invention has a significantly reduced weight, and can be easily transported and held on site. Therefore, in a gas station or the like where the oil / water separation tank needs to be buried, the construction period can be greatly shortened by adopting the oil / water separation tank according to the present invention. As a result, it is possible to prevent the workers in the field from danger and reduce the labor. Furthermore, since the lid can be installed according to the drainage gradient of the floor, it is a factory prefabricated product, but it can be constructed in the same way as a conventional oil-water separation tank cast on site, or even more suitable for the site. .

[Brief description of drawings]

FIG. 1 is a perspective view showing an oil / water separation tank according to an embodiment of the present invention, in which an oil / water separation tank, a lid hanging frame, and a lid are disassembled and shown.

FIG. 2 is a cross-sectional view showing the structure of the oil-water separation tank shown in FIG.

FIG. 3 is a cross-sectional view showing how the oil-water separation tank shown in FIG. 1 is buried.

FIG. 4 is a cross-sectional view showing how pipes are installed in a buried oil / water separation tank.

FIG. 5 is a cross-sectional view in a short direction of the oil-water separation tank showing a state in which a lid hanging frame is installed.

FIG. 6 is an enlarged view showing details of a buried communication pipe and a pipe for connection.

FIG. 7 is an enlarged view showing details of a level adjusting mechanism.
7A is a cross-sectional view, and FIG. 7B is a side view.

FIG. 8 is a cross-sectional view showing a state in which an oil / water separation tank is constructed.

[Explanation of symbols]

 1 ... Outer frame 2, 3 ... Side of outer frame 4 ... Upper edge of outer frame 5 ... Lower edge of outer frame 6 ... Support beam 7 ... Partition wall 8 ... Opening area 10 ... Oil / water separation tank 11・ ・ Bottom surface 15 ・ ・ Section (oil / water separation box) 20 ・ ・ Lid frame 29 ・ ・ Lid 30 ・ ・ Level adjustment mechanism 40 ・ ・ Communication pipe 50 ・ ・ Insert 60 ・ ・ Floor

Claims (4)

[Scope of utility model registration request] 1. A substantially cylindrical concrete outer frame with both upper and lower ends opened and at least one concrete partition wall provided inside the outer frame. A precast type characterized by having a plurality of compartments and a resin-made communicating pipe that is embedded in the partition wall so as to connect the plurality of adjacent compartments and that has a length substantially equal to the wall thickness of the partition wall. Oil-water separation tank. 2. The apparatus according to claim 1, further comprising a lid hanging frame on an upper portion of the outer frame, and the lid hanging frame is installed on an upper end of the outer frame through a plurality of height adjusting means. Characteristic precast oil-water separation tank. 3. The height adjusting means according to claim 2, wherein the height adjusting means includes a plate member fixed to the lid hanging frame, and the plate member is formed with an elongated hole screwed to an upper portion of an outer frame. A precast oil-water separation tank that is characterized by 4. The method according to any one of claims 1 to 3,
A precast type oil-water separation tank, characterized in that a projection portion embedded in the partition wall is formed along the outer periphery of the communication pipe.