JP4182020B2 - Tank bottom inner corner structure and construction method thereof - Google Patents

Description

  The present invention relates to a tank bottom inner corner structure and a construction method thereof.

  As shown in FIG. 2, for example, a bottom inner corner formed by a concrete bottom floor 1 in a PC low temperature tank and a cylindrical concrete side wall 2 provided on the upper surface of the bottom floor 1 In order to prevent moisture from entering the tank, a liner plate 3 is provided. The liner plate 3 includes an inclined portion 3a that is inclined upward from the tank center toward the inner peripheral side of the side wall 2, a horizontal portion 3b that extends horizontally from the lower end of the inclined portion 3a along the upper surface of the bottom floor 1, and an inclined portion 3a. And a vertical portion 3c extending upward along the inner periphery of the side wall 2.

  A bottom liner anchor 4 is provided on the bottom floor 1, and an end of the horizontal portion 3 b of the liner plate 3 is welded to the bottom liner anchor 4. A side wall liner anchor 5 is provided on the side wall 2, and an upper end side of the vertical portion 3 c of the liner plate 3 is welded to the side wall liner anchor 5.

  Thus, the inner space 6 is formed by the bottom floor 1 and the side wall 2 and the inclined portion 3a of the liner plate 3. In the inner space 6, by using the liner plate 3 as a mold, a cement-based filler is used. The reinforcing part 7 can be formed by filling. The inclined portion 3 a of the liner plate 3 is provided with a plurality of cement filler filling holes 8 at predetermined intervals in the circumferential direction of the side wall 2.

  Reference numeral 9 denotes a bottom liner plate installed on the upper surface of the bottom floor 1, and an end of the bottom liner plate 9 is welded to the bottom liner anchor 4. Reference numeral 10 denotes a side wall liner plate attached to the inner periphery of the side wall 2, and the lower end of the side wall liner plate 10 is welded to the side wall liner anchor 5.

  In the tank, as described above, when the liner plate 3 having a predetermined length is provided in the circumferential direction of the side wall 2, a cement-based filler is placed in the internal space from the circumferential opening side of the liner plate 3. Along with the placement of the cement-based filler, the air in the internal space 6 is exhausted to the outside of the internal space 6 from the plurality of cement-based filler-filling exhaust holes 8. The state of filling of the cement filler is also confirmed from the exhaust hole 8 for filling the cement filler. Thus, the reinforcement portion 7 is formed by installing the liner plate 3 and placing the cement-based filler into the internal space 6 over the entire circumference.

As an example of the reinforcing structure of the bottom corner portion in the PC low-temperature tank, there is Patent Document 1, for example. In Patent Document 1, a ring projecting upward at the peripheral edge of the bottom foundation and a flexible anchor are provided inside the ring, and a side wall is formed integrally with the anchor. Are not directly related.
JP 58-98575 A

  In the tank shown in FIG. 2, when the cement-type filler is filled in the internal space 6, the cement-type filler filling exhaust hole 8 is welded to the upper surface of the cement-type filler filling exhaust hole 8. Is blocked. In this case, a stepped discontinuous portion is formed by the closing plate 11 in the inclined portion 3 a of the liner plate 3. Thus, when the closing plate 11 is welded to the inclined portion 3a of the liner plate 3, the inclined portion 3a is distorted under the influence of welding. For this reason, when there is a discontinuous portion due to the closing plate 11 in the inclined portion 3a, the liner plate structure sufficiently achieves the function of releasing the external force acting on the liner plate 3 by the deformation of the liner plate 3 due to the pressure between the inner and outer tanks. There is a problem that it is not possible in terms of strength.

  In view of the above-mentioned situation, the present invention prevents the discontinuity due to the closing plate from occurring in the inclined portion of the liner plate provided at the bottom inner peripheral corner portion of the bottom floor and the side wall, and the liner plate by the pressure between the inner and outer tanks. The purpose is to improve the function of releasing the acting external force by the deformation of the liner plate and to improve the strength of the tank.

  The tank bottom inner corner portion structure according to claim 1 is provided with a liner plate at a bottom corner portion formed by a bottom floor and a side wall provided on an upper surface of the bottom floor, and the bottom floor and the side wall and the liner plate In the tank bottom inner corner portion structure in which a cement-based filler is placed in the formed space to form a reinforcing portion, one end communicates with the space and the other end is in the wall portion of the side wall. An exhaust pipe communicating with a space other than the space is provided.

  In the tank bottom inner corner part structure of claim 2, the bottom floor and the side wall are made of concrete. In the tank bottom inner corner part structure of claim 3, the liner plate is directed from the bottom floor toward the inner peripheral side of the side wall. It is provided with an inclined portion formed in an upward gradient.

  According to a fourth aspect of the present invention, there is provided a method for constructing a tank bottom inner corner portion structure, wherein a liner plate is provided on a bottom corner portion formed by a bottom floor and a side wall provided on an upper surface of the bottom floor, When the cement-based filler is placed in the space formed by the liner plate to form the reinforcing portion, the air exhausted from the space accompanying the placement of the cement-based filler is communicated at one end to the space. And the other end is exhausted through an exhaust pipe provided in the wall portion of the side wall so as to communicate with a space other than the space.

  According to the tank bottom inner corner structure and the construction method thereof according to the first to fourth aspects of the present invention, the exhaust hole and the closing plate for filling the cement-based filler, which are conventionally required, are not necessary. The discontinuous portion is not formed, and therefore, the factor that hinders the deformation of the liner plate is removed at the bottom corner portion of the tank. Therefore, the external force acting on the liner plate due to the pressure between the inner and outer tanks is released by the deformation of the liner plate. It is possible to obtain an excellent effect that the function is improved and the strength of the liner plate can be improved.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an example of an embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 2 denote the same parts, and the basic configuration is the same as that of the conventional one shown in FIG. It is substantially the same. Thus, the feature of the illustrated example is that the cemented filler filling exhaust hole 8 and the closing plate 11 (see FIG. 2) formed in the inclined portion 3a of the liner plate 3 are not provided, and the wall of the side wall 2 is provided. A U-shape is formed so that one end communicates with the interior space 6 formed by the bottom floor 1, the sidewall 2 and the liner plate 3, and the other end communicates with a space surrounded by the sidewall 2 other than the interior space 6. An exhaust pipe 12 for filling cement filler is provided.

  In the illustrated example, a liner plate 3 having a predetermined length is provided in the circumferential direction of the bottom inner corner formed by the bottom floor 1 and the side wall 2, the horizontal portion 3b is welded to the bottom liner anchor 4, and the vertical portion 3c is The side wall liner anchor 5 is welded, and a cement filler is placed in the inner space 6 from the circumferential opening side of the liner plate 3 (direction perpendicular to the paper surface of FIG. 1). Along with the placement of the cement-based filler, the air in the internal space 6 is exhausted from the cement-based filler-filling exhaust pipe 12 to the space surrounded by the side wall 2. Thus, the reinforcement plate 7 is formed by providing the liner plate 3 around the entire inner periphery of the bottom and placing the cement filler.

  According to the illustrated example, the cement-based filler filling exhaust hole 8 and the blocking plate 11 shown in FIG. 2, which are necessary in the past, are not required, so that no discontinuous portion is formed in the inclined portion 3 a of the liner plate 3. . For this reason, in the bottom corner portion of the tank, the factor that hinders the deformation of the liner plate 3 is removed. Therefore, the function of releasing the external force acting on the liner plate 3 due to the pressure between the inner and outer tanks by the deformation of the liner plate 3 is improved. The strength of the liner plate can be improved.

  It should be noted that the present invention can be applied to tanks other than the PC low temperature tank, and various modifications can be made without departing from the scope of the present invention.

It is sectional drawing which shows an example of embodiment for demonstrating the tank bottom part inside corner part structure and its construction method of this invention. It is sectional drawing which shows an example of the conventional tank bottom part inside corner part structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bottom floor 2 Side wall 3 Liner plate 3a Inclined part 6 Internal space (space)
7 Reinforcement part 12 Cement-based filler filling exhaust pipe (exhaust pipe)

Claims (4)

  A liner plate is provided on a bottom corner formed by a bottom floor and a side wall provided on the top surface of the bottom floor, and a cement-based filler is placed in the space formed by the bottom floor, the side wall, and the liner plate. In the tank bottom inner corner portion structure that forms the reinforcing portion, an exhaust pipe having one end communicating with the space and the other end communicating with a space other than the space is provided in the wall portion of the side wall. A tank bottom inner corner structure characterized by that.   The tank bottom inner corner structure according to claim 1, wherein the bottom floor and the side wall are made of concrete.   3. The tank bottom inner corner portion structure according to claim 1, wherein the liner plate includes an inclined portion formed in an upward gradient from the bottom floor toward the inner peripheral side of the side wall.   A liner plate is provided on a bottom corner formed by a bottom floor and a side wall provided on the top surface of the bottom floor, and a cement-based filler is placed in the space formed by the bottom floor, the side wall, and the liner plate. When forming the reinforcing portion, the side wall is arranged such that one end of the air exhausted from the space as the cement-based filler is placed communicates with the space and the other end communicates with a space other than the space. A method for constructing a tank bottom inner corner portion structure characterized by exhausting through an exhaust pipe provided in the wall portion of the tank.

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