JP2003261195A - Buried tank - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a buried tank made of a synthetic resin, for the manufacturing of which any high processing technology is not needed and in addition much time and efforts are not required, and for the installing of which much time and efforts are not needed. <P>SOLUTION: The buried tank 1 comprises a main body 2 of the tank made of the fiber reinforced synthetic resin which is a closed tube having an upper opening and the axis direction of which is vertical, a protective stuff 3 made of (reinforced) concrete covering around whole circumference of the lower part of the tank main body and a lid 6 made of the fiber reinforced synthetic resin or the (reinforced) concrete which is mounted on the upper opening of the tank main body, wherein a projection 5 covered by the protective stuff 3 is mounted on the side surface of the lower part of the tank main body. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a buried tank made of fiber reinforced synthetic resin.

[0002]

2. Description of the Related Art Tanks made of synthetic resin that are directly buried in the ground often have a circular cross section in order to reduce deformation caused by earth pressure from the outside or water pressure from the inside. There is. That is, generally, a hollow cylindrical main body, that is, a tubular tank main body is fixed to both end faces with outward convex closing plates, that is, so-called end plates.

Since these buried tanks made of synthetic resin are required to have high strength, FRP (fiber reinforced thermosetting synthetic resin) and FRPM (fiber reinforced resin concrete) are usually used. Usually, a tubular tank body is attached by a method such as attaching a tube end blocking cap having a receiving structure to the tubular tank body together with an adhesive as necessary, or fixing an end plate to the tubular tank body by a hand lay-up method. It is attached to both ends of.

Further, in order to minimize the influence of the above earth pressure and water pressure, such a buried tank is usually arranged and constructed in the ground so that the maximum buried depth becomes small. . That is, the tubular axis of the tubular tank body is arranged in the horizontal direction.

In this case, if the tank body has a large diameter,
The magnitude of earth pressure differs between the upper surface and the lower surface of the buried tank. Therefore, at the body mounting portion of the end plate, a deformation stress acts along the circumferential direction. That is,
Since the mounting part is constantly distorted, it is necessary to limit the deformation against this, and therefore, when mounting the end plate to the main body, it is necessary to increase the mounting strength, and advanced processing technology is required. It had been.

Therefore, in the end plate having the tube end closing cap, it is possible to resist deformation by increasing the thickness of the cap, increasing the receiving length of the connecting portion, and further increasing the thickness of the tubular tank body. Had to be done. Even in the case of the hand lay-up method, it is necessary to take measures such as increasing the number of laminated layers, which requires a lot of time and effort for production, resulting in high cost.

In these burial tanks, a tank in which both end surfaces of a tubular tank main body are attached with end plates having high pressure resistance is prepared and transported to the burial site for burial. Therefore, there is a problem that it takes time and effort to attach two high-strength end plates at the time of manufacturing the tank, which further increases the cost.

[0008]

DISCLOSURE OF THE INVENTION The buried tank of the present invention solves the problems of the conventional buried tank described above, and does not require a high processing technology in tank manufacturing, does not require manufacturing labor, and requires less construction labor. It was made for the purpose of providing a resin-made buried tank.

[0009]

A buried tank according to the present invention for solving the above-mentioned problems includes a tank main body made of fiber reinforced synthetic resin in which an axial direction of a bottomed tubular body having an opening at the top is vertical, and a tank. Consists of a (reinforcing) concrete protective material that covers the entire outer peripheral surface of the lower part of the main body, and a lid made of fiber reinforced synthetic resin or (reinforcing bar) concrete provided in the upper opening of the tank main body. The embedded tank is characterized in that a protrusion is provided on the base and the protrusion is covered with the protective material.

In the present invention, the fiber reinforced synthetic resin used for the tank body and the bottom plate has a strength to withstand burying and a strength to withstand buoyancy when the tank is empty,
The material is not particularly limited as long as it is a material that does not have water resistance as a tank and does not contaminate stored water. For example, as an example, FRP (fiber reinforced thermosetting resin), FRPM (fiber reinforced resin concrete), vinyl chloride resin, polyethylene Fiber-reinforced composite resins of thermoplastic resins such as polypropylene and nylon.

The bottom plate and the tank main body are joined by F
If it is made of RP or FRPM, it may be done by a normal hand lay-up method, and in the case of a fiber reinforced thermoplastic resin, depending on the resin material, fusion bonding, adhesion, joint connection, etc. The connection may be made according to the situation.

The protective material is concrete (reinforcing bar) wound so as to cover the entire outer peripheral surface of the lower part of the tank body. It is desirable that this protective material completely covers the connection between the bottom plate and the tank body. This protective material can also serve as the tank foundation.

(Operation) The buried tank of the present invention covers the tank main body made of fiber reinforced synthetic resin in which the axial direction of the bottomed tubular body having an upper opening and the entire outer peripheral surface of the lower portion of the tank main body (reinforcing bar). ) As it consists of a concrete protective material and a lid made of fiber reinforced synthetic resin or (reinforced steel) concrete provided in the upper opening of the tank body, place the protective material below in the hole drilled for burying. By embedding with the axis of the tank body vertical, deformation stress due to earth pressure or water pressure is not applied to the bottom surface of the tank and therefore it is not distorted. Therefore, in tank manufacturing, it is necessary to mount the end plate (the bottom surface of the tank in the present invention). No advanced processing technology is required and no labor is required for production.

In addition, a protrusion is provided on the outer surface of the lower portion of the tank body, and the bottom of the tank including the protrusion is completely covered with a protective material, so that when the amount of the contents of the tank decreases. A so-called anchor effect, which resists the buoyancy of the tank, is exhibited, and at the same time, the deformation stress applied to the connection portion between the bottom plate and the tank body can be prevented, and the occurrence of strain can be suppressed.

Further, at the tank burial site, the burial site is excavated, the tank is erected vertically with its protective material facing down, and the protective material also serves as the tank foundation.
Since the construction is completed simply by making the lid flush with the ground surface,
It does not require construction work.

When a lid having a through hole is provided at the upper end of the tank body, a pipe or a manhole is provided at the through hole to protect a passing automobile or the like against dynamic pressure (rebar). The tank can be buried by the usual construction method such as installing a concrete floorboard. The connection between the lid and the tank body is along the circumference of the tank, and the earth pressure is evenly applied along the circumference, so that distortion is unlikely to occur.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Next, referring to the drawings, the buried tank made of synthetic resin of the present invention will be explained. FIG. 1 is a sectional view of an example of a buried tank of the present invention.

The buried tank 1 is a FRPM tank body 2
A buried tank 1 comprising: and a (reinforcing) concrete protective material 3 surrounding a lower part of the tank body, wherein the tank body 2 is a pipe body having an axially vertical direction and having a bottom plate 4 opened upward, The material 3 covers the entire lower peripheral surface of the tank body 1.

In this example, a FRPM lid 6 having a through hole 61 is provided at the upper end of the tank body 2, and a FRPM projection portion provided on the lower peripheral portion of the bottom plate 4 and the tank body 2 with the protective material 3. 5 and are covered. A (reinforced) concrete floorboard S is provided on the top of the lid 6, and the through hole 61
Is a manhole M opened on the surface of the earth. Of course,
The through hole 61 may be connected to a pipe or the like (not shown) other than the manhole M.

The connection between the lid 6 and the tank body 2 is as described above.
As in the case of joining the bottom plate 4 and the tank main body 2, if they are manufactured by FRP or FRPM, it is sufficient to rely on the usual hand lay-up method, and in the case of a fiber reinforced thermoplastic resin, Depending on the material, it may be connected by a method suitable for the situation, such as fusion bonding, adhesion, and joint connection.

As shown in FIG. 1, the protective material 3 may be used as a basic concrete when the tank 1 is installed as it is, or a concrete foundation may be separately placed and placed on it. In any case, the protective material 3 has a weight against buoyancy so that the tank 1 does not float when the tank 1 becomes empty.

The lower end wall of the tank body 2 may be projected downward from the bottom plate 4 as shown in FIG. In this case, the protective material 3 is also filled between the pipe wall in the vicinity of the lower end of the tank body 2 and the bottom plate 4, so that the tank 1 can be stably installed when the tank 1 is buried.

FIG. 3A shows an example of the protrusion 5 provided on the outer surface of the lower portion of the tank body 2, and FIG.
It shows in (b). In FIG. 3A, the protruding portion 5 is an annular rib-shaped strip that is provided so as to project over the entire lower portion of the tank body 2, or a partially cut annular rib-shaped strip. This rib-shaped strip (5) acts as an anchor when the tank is emptied, as described above, and therefore its height is higher than that of the protective material 3.
It is not particularly limited as long as it is embedded inside and can exert a sufficient anchoring force, and may be appropriately changed and determined according to the situation.

The material is not particularly limited as long as it has high strength and excellent corrosion resistance. For example, reinforced composite resins such as FRP (fiber reinforced synthetic resin) and FRPM; stainless steel, iron, aluminum And the like. Further, the joining method is not particularly limited as long as the rib-shaped strip (5) and the tank main body 2 are firmly joined. For example, the rib-shaped strip (5) is formed on the lower outer peripheral surface of the tank main body 2. It is possible to cite a method in which the FRP layer 7 and the like are hand-laid up and coated and adhered.

In the example of FIG. 3 (b), the protrusion 5 is a pin projecting through the lower pipe wall of the tank body 2. The material of the pin and the like are not particularly limited as in the case of the rib-shaped band, but since the cross-section is small and high strength is required,
Usually, metals such as iron and stainless steel are often used.

The pin fixing method is not particularly limited as long as the pin is firmly fixed to the main body. For example, as an example, a method of preparing a pin component having a pin protruding from a seat plate, adhering the seat plate to the outer surface of the tank body, welding, and hand laying up the FRP layer according to the material of the tank and the pin component. Or, a through hole is provided in the wall of the tank main body 2, the pin is projected from the inside of the tank, the seat plate is bonded to the inner surface of the tank main body 2, welded, and the FRP layer is hand laid up. And a method of performing hand lay-up of the FRP layer or the like.

The protective material 3 may be previously provided in the lower part of the tank main body 2 before the tank 1 is buried, but the tank base is cast in situ at the burying site, and the lower part of the tank main body 2 is placed on this foundation. The base concrete may be solidified by burying it and used as the protective material 3. In this case, since the protective material 3 is also used as the tank foundation, it is sufficient to simply backfill the tank 1 after placing the tank 1 in the excavation hole, which has the effect of further reducing the cost.

A floor plate S may be provided on the upper portion of the tank 1 so that an automobile or the like can be overloaded as required. The floor plate S is not particularly limited as long as it is provided by a normal slab construction method, and for example, the manhole M
It may be carried out by appropriately selecting it depending on the situation, such as a method of striking (reinforced) concrete above the plane cross section of the tank main body 2 and installing a manhole M cover at a required position like installation of a cover.

[0029]

EFFECTS OF THE INVENTION As described above, the buried tank of the present invention is a synthetic resin-made buried tank which does not require a high processing technology in tank manufacturing, requires no manufacturing labor, and is easy to construct. Of.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an example of a buried tank of the present invention.

FIG. 2 is a cross-sectional view of another example of the lower portion of the tank body.

FIG. 3A is a cross-sectional view of an example of a protrusion provided on the outer surface of the lower portion of the tank body. (B) It is sectional drawing of another example of the protrusion provided in the tank body lower outer surface.

[Explanation of symbols]

1 buried tank 2 Cylindrical tank body 3 protective materials 4 bottom plate 5 protrusions 6 lid 61 through hole 7 Hand layup FRP layer S floor board M manhole

Claims (3)

[Claims] 1. A tank main body made of fiber reinforced synthetic resin in which an axial direction of a bottomed tubular body having an upper opening is vertical, a concrete protective material covering the entire outer peripheral surface of a lower portion of the tank main body, and a tank. It is composed of a lid made of fiber reinforced synthetic resin or (reinforced steel) concrete provided in the upper opening of the main body, and a projection is provided on the lower outer surface of the tank main body, and the projection is covered with the protective material. A buried tank that is characterized by 2. The buried tank according to claim 1, wherein the protective material serves as a tank base, and the lid has a through hole. 3. The buried tank according to claim 1, wherein the lid is a floor plate.