JPS6030229Y2 - Drainage equipment for underground tanks - Google Patents

Description

[Detailed description of the invention] This invention relates to underground water drainage equipment installed in an underground tank.

In the design of underground tanks, particular consideration is given to the problem of underground tank surfacing due to groundwater pressure and freezing.

Conventionally, this type of problem has been solved by burying a water collection pipe, a water collection tank, and a pumping pipe in communication with each other around the underground tank, and then flowing the groundwater that has sprung up around the bottom of the underground tank to the water collection tank through the collection pipe. The problem was solved by collecting groundwater and draining this underground water to the surface using pumping pipes.

By the way, water collection tanks house pumps and other pumping equipment that pump underground water above ground, and these pumping equipment need to be periodically inspected and repaired as the case may be.

Furthermore, since sand, clay, silt, etc. flow into the water collection tank together with groundwater and accumulate there, it is necessary to discharge these sediments to the ground.

Traditionally, these tasks were carried out by workers entering the water collection tank through the pumping pipe.

However, the diameter of the lift pipe differs depending on the size of the underground tank, and the smaller the underground tank, the smaller the diameter of the drain pipe generally becomes.

As a result, equipment for inspecting or repairing the water pumping equipment in the water collection tank or for discharging sediment from the water collection tank cannot be brought into the water collection tank, and even workers may not be able to enter the water collection tank. .

Furthermore, if the diameter of the pumping pipe is small, the work efficiency will be significantly reduced when transporting earth and sand to the ground.

This idea was proposed in order to solve the above-mentioned conventional problems, and as usual, a water collection pipe, a water collection tank, and a water pumping pipe are buried in communication with each other around the underground tank, and the water collection pipe is connected to the water collection pipe. By collecting the groundwater that has sprung up around the bottom of the underground tank into a water collection tank and draining this groundwater to the surface using a pumping pipe, we have solved the problem of the underground tank floating due to water pressure and freezing of the groundwater, and also installed a manhole in the water collection tank. By installing a manhole and allowing workers to enter and exit the water collection tank through this manhole, work such as inspecting and repairing water pumping equipment and transporting earth and sand will be carried out smoothly.

This invention will be explained below with reference to an illustrated embodiment.

The tank equipped with the drainage device of the embodiment is an underground tank for storing gas or liquid, and as shown in FIGS. 1 to 4, the wall portion of the underground tank 1 is made of concrete and is continuous underground. It is composed of walls 2 and internal concrete 3, and the bottom part 4 of the underground tank 1 is composed of cast-in-place concrete, and a waterproof layer 5 is formed on its surface.

A disc-shaped floating roof 6 floats on the liquid level in the tank 1, and the gap created between the floating roof 6 and the internal concrete 3 is filled with a weather hood 7 and a soft seal 8. It is blocked by.

Next, a drainage layer 9 made of a crushed stone layer is formed below the bottom portion 4, and a large number of water collection pipes 10 are buried in the drainage layer 9 in the form of a spider web.

The water collection pipes 10 are made of PVC pipes or the like, and have a large number of water collection holes 10a formed on their surfaces.

In addition, water collection layers 11 are buried in four orthogonal locations around the bottom portion 4, and the water collection pipes 10 and
... and the pumping pipe 12 are connected.

The lift pipe 12 is buried vertically in the internal concrete 3,
has reached the ground.

In addition, an underground tank 1 is provided in the water collection tank 11 by penetrating the bottom portion 4.
A manhole 13 opening above the floor surface is formed, and a lid 14 is attached to the manhole 13.

In addition, a water pump 15 is installed inside each water collection tank 11.

On the other hand, a plurality of legs 16 hang down and protrude from the lower surface of the floating roof 6 to ensure a minimum height h above the floor of the floating roof 6 when the liquid level falls, and the height h is The height of the manhole cover 14 is adjusted to match the height of the manhole cover 14, and roof manholes 6a, into which the cover 14 of the manhole 13 enters, penetrate vertically at four locations on the floating roof 9 directly above and in opposition to the manhole 13. A roof lid 17 is attached to the upper end opening of the roof manhole 6a so as to be openable and closable.

The drainage equipment of the embodiment is constructed in this way, and when the tank is in use, raincoats on the tank floor and roof are removed.14.1
7 are both closed.

Therefore, when the tank is in use, high-pressure spring water from underground around the tank that seeps into the drainage layer 9 at the bottom of the tank quickly flows into the water collection tank 11 through the water collection pipe 10 and the reservoir 18 at the connection part of the water collection pipe 10. Since the water flows in and is drained to the ground from the pump 12 at the appropriate time by the pump 15, the tank 1 is not subjected to external pressure.

By the way, when inspecting and repairing the pumping mechanism and transporting earth and sand, etc., if the internal liquid is extracted from the tank, the lid 14 will fit into the roof manhole 6a by the landing of the floating roof leg 16. 17 directly below.

In this state, even if sludge or other liquid remains on the floor of the tank 1, it will not interfere with subsequent work because the floating roof 6 is at a higher level.

Next, after opening the roof cover 17, continue to open the manhole 1.
By opening the lid 14 of No. 3, the worker can easily go in and out of the water collection tank 11 through the manhole 13.

As described above, according to the underground tank drainage equipment according to the present invention, the underground water that has been injected into the drainage layer at the bottom of the tank can be drained.
In addition to letting the water flow into the water collection tank through the water collection pipe, the water in the water collection tank is drained to the ground from the lift pipe using a power pump at appropriate times, and the manhole installed in the water collection tank is connected to the manhole on the floating roof. With this structure, groundwater that has sprung up around the underground tank can be quickly and easily drained, thereby preventing the problem of the underground tank floating due to groundwater, and even if sludge or stored liquid remains. Since workers can enter and exit the water collection tank through the manhole, perform maintenance and inspection of drainage equipment, and carry in and out work equipment, it has the effect of greatly improving various work efficiency.

[Brief explanation of the drawing]

Figure 1 is a plan view of a drainage facility for an underground tank showing an embodiment of the present invention, Figure 2 is a cross-sectional view of the underground tank in Figure 1, and Figure 3 is the lower part of part (2) in Figure 2. The enlarged sectional view of FIG.
FIG. 3 is a side cross-sectional view of the left portion of the figure. 1...Tank, 3...Internal concrete as tank wall, 4...Bottom part, 6...
...Floating roof, 6a...Roof manhole, 9
... Drainage layer, 10 ... Water collection pipe, 11.
... Water collection tank, 12 ... Lifting pipe, 13 ...
・・・◆Manhole.

Claims (1)

[Scope of utility model registration request] In drainage equipment for discharging underground spring water around the tank bottom of a floating roof underground tank to the surface, there is a drainage layer stratified below the bottom along the tank bottom, and a distribution pattern within the drainage layer. a plurality of water flow tanks that are buried at key points around the bottom of the tank and into which the water from the water collection pipes flows; Lifting pipes with suction openings facing each water collection tank, manholes installed in each water collection tank that stand above the tank floor and have an opening/closing lid attached to the top opening, and a floating roof of the tank. A drainage system for an underground tank, characterized in that a heavy roof manhole is formed directly above and in contact with each of the manholes.