Lined tank and method for fabricating the same

Claim 2

A lined tank made of concrete comprising: a plurality of lining plates forming an interior surface of said tank; a plurality of concrete shutterings embedded in concrete welded to said lining plates for supporting said linings; a plurality of steel members embedded in said concrete welded to support said concrete shutterings; a plurality of backing plates adjacent said shutterings and spaced apart therefrom; said backing plates, concrete shutterings and steel members forming a plurality of leakage detecting channels so as to detect leakage from the tank at portions where said lining plates are welded to said backing plates, each of said leakage detecting channels extending along the periphery of a respective backing plate to form an independent leakage detecting channel for each of said plates.

Claim 3

The lined tank according to claim 1, wherein each of said concrete shutterings comprises a flat plate having ends which are attached to the adjacent embedded shaped steel members.

Claim 4

The lined tank according to claim 1, wherein each of said concrete shutterings comprises a waved steel plate having ends which are attached to the adjacent embedded shaped steel members.

Claim 5

The lined tank of claim 1, further comprising a plurality of conduits, each of said conduits connecting a respective leakage detecting channel with a communication channel common to all of the conduits.

Claim 6

In a method for fabricating a lined tank in which a space between inside and outside molding frames of the tank is filled with concrete and after the setting thereof lining plates are attached to the concrete; the improvement which comprises the steps of forming a unit structure by elements comprising concrete shutterings, backing plates, embedded shaped steel members and a plurality of leakage detecting channels defined by said elements, each of said leakage detecting channels extending along the periphery of a respective backing plate to form an independent leakage detecting channel for each of said plates; securing said unit structure to the inside molding frame by a member for reinforcing the molding frame and a member for clamping said molding frame; interconnecting a plurality of said unit structures; connecting said unit structures to the outside molding frame by means of said clamping member; filling concrete into a space between said inside and outside molding frames of the tank; and attaching said lining plates to the inside wall of the tank after the concrete has set.

Claim 7

In a method for fabricating a lined tank in which a space between inside and outside molding frames of the tank is filled with concrete and after the setting thereof lining plates are attached to the concrete; the improvement which comprises the steps of forming a unit structure by elements comprising concrete shutterings, backing plates, embedded shaped steel members and a plurality of leakage detecting channels defined by said elements, each of said leakage detecting channels extending along the periphery of a respective backing plate to form an independent leakage detecting channel for each of said plates; securing said unit structure to the inside molding frame by a member for reinforcing the molding frame and a member for clamping said molding frame; interconnecting a plurality of said unit structures; connecting said unit structures to the outside molding frame by means of said clamping member; filling concrete into a space between said inside and outside molding frames of the tank; and attaching said lining plates to the inside wall of the tank after the concrete has set.

Claim 8

The method according to claim 5, wherein said unit structures are arranged in a tank having corner portions so that when said lining plates are attached, only the longitudinally central portions of the lining plates are placed in the corner portions of the tank, whereby the attached portions of the lining plates are not positioned in the vertical direction in the corner portions of the tank.

Claim 9

The method according to claim 5, wherein said unit structures are disposed at right angles at the bottom corners of said tank and at least one unit structure having a larger span than those of the unit structures at the bottom corners and are interposed therebetween with spaced relationship, and said lining plate is connected to said unit structures through said backing plate.