JPS5948918B2 - Tank side structure - Google Patents

Description

[Detailed description of the invention] The present invention relates to a tank side structure.

As a conventional LNG storage tank, one having a double shell structure having an outer tank and an inner tank is known.

Furthermore, as an outer tank of such a tank, one is known in which a steel tank body plate is provided on the upper part of the side wall of a prestressed concrete structure, and a steel roof is provided on the upper part of this tank body plate. ing. However, as an example of a conventional side structure for such a tank, one constructed as shown in FIG. 1 is known.

That is, after the concrete of the side wall 1 hardens, the PC in the circumferential direction
By tensioning the steel wire 2 and the vertical PC steel rod 3, and then burying the lower part of the tank body plate 4 and the anchor 5 provided at this lower end in the post-cast concrete 6 in the upper part of the side wall 1. It is structured as follows. In addition, 7 is the roof, Ba,
8b is a reinforcing bar. Further, the post-cast concrete 6 is for protecting the anchor 9 of the vertical PC steel bar 8 from corrosion. By the way, in the case of such a conventional side structure of a tank, the tank body plate 4 is simply buried in post-cast concrete 6 via the anchor 5. In addition, since the tank body plate 4 is set after the side wall 1 is tensioned with the PC steel wire 2 and the PC steel rod 3, there is no effect of press dressing on the side wall 1 and the tank body plate 4. , and further reinforcing bar Ba
In order to transmit the force to the tank body plate 4, a hole 10 must be provided in the lower part of the tank body plate 4, and some reinforcing bars 8b must be inserted through this hole 10.In this way, the construction is troublesome, and the construction cost increases. Furthermore, there were other drawbacks such as poor sealing performance of the tank body plate 4. The present invention has been made in view of the above circumstances, and provides a side structure of a tank that is easy to construct, can reduce construction costs, and does not have inferior sealing performance of the tank body plate. The purpose is to

Hereinafter, one embodiment of the present invention will be described together with its construction method with reference to FIG. 2.

In this embodiment, first, the formwork and reinforcing bars (
(both not shown) and place the angle 12 at the upper end of the inner formwork, then anchor 13 at the lower outer surface.
A steel tank body plate 14 to which is welded is placed on top of the angle 12, and then the side wall 11 is concreted as shown by the two-dot chain line using the lower part of the tank body plate 14 as part of the inner formwork. PC is poured after concrete hardens.
It is made by applying tensile stress to the steel wire 15 and causing the side wall 11 to contract by an appropriate amount of ΔS in the radial direction. Note that this shrinkage amount Δ
When the diameter of the tank is about 60 m, S is about the size of a type 2 tank. In addition, 16 in Fig. 2 is a vertical PC steel bar, 17
19 is post-cast concrete for protecting the anchor 18 of this PC steel bar 16 from corrosion, and 19 is the roof. That is, the tank body plate 14 is provided on the upper inner surface of the side wall 11 having a prestressed concrete structure.

Therefore, by applying a tensile stress to the PC steel wire 15 and causing the side wall 11 to contract in the radial direction, the lower part of the tank body plate 14 is tightened by the upper part of the side wall 11, so that the side wall 1
The upper part of tank body plate 14 and the lower part of tank body plate 14 are completely brought into close contact with each other with a relatively large pressing force. This increases the strength of the connection between the upper part of the side wall 1 and the lower part of the tank body plate 14. Therefore, the strength is sufficient even if the anchors 13 are not provided all around the circumference, and it is possible to reduce the number of anchors 13. can. Further, since the lower part of the tank body plate 14 is provided inside the upper part of the side wall 11, the work of assembling reinforcing bars is facilitated, and the sealing performance of the tank body plate 14 is not inferior. Incidentally, the angle 12 is provided to facilitate installation of the tank body plate 14, and therefore, it may be provided as necessary. As explained above, according to the tank side structure according to the present invention, since the tank body plate is provided on the upper inner surface of the side wall of the prestressed concrete structure, the PC
By applying tensile stress to the steel wire and causing the side wall to contract in the radial direction, it is possible to increase the bonding strength between the side wall and the tank body plate, thereby reducing the number of anchors and reducing the need for reinforcing bars. Assembling work becomes easier, construction becomes easier, construction costs can be reduced, and the sealing performance of the tanta body plate is not inferior.

[Brief explanation of the drawing]

FIG. 1 is a partial vertical side view showing an example of the side structure of a conventional tantaur, and FIG. 2 is a partial vertical side view showing an example of the side structure of a tank according to the present invention. 11...Side wall, 14...Tanta body plate,
15...PC steel wire.

Claims (1)

[Claims] 1. A tank side structure characterized by having a steel tank body plate provided on the upper inner surface of a side wall having a prestressed concrete structure.