JPH0412319Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention relates to an anchor device for an above-ground storage tank.

BACKGROUND OF THE INVENTION Storage tanks installed above ground are often anchored to foundations fixed in the ground to resist earthquakes and other external forces.

As an example of an anchor device for an above-ground storage tank, as shown in FIG. The structure is widely used. The storage tank illustrated in FIG. 1 is a low-temperature above-ground storage tank, and an outer tank 6 is provided on the outside of the inner tank serving as the storage tank frame 1 with a heat insulating layer 5 interposed therebetween, and a bottom cooler 7 is provided at the bottom of the storage tank. ing. Further, in this example, the foundation 3 is supported by the ground 2 via foundation piles 8.

As a method for attaching the upper end of the anchor strap 4 and the storage tank side plate without welding, a structure as shown in FIGS. 2 and 3 is conventionally known. A in each figure is a front view looking toward the outer surface of the storage tank side plate.
b is a sectional view taken in a direction perpendicular to this. In the example shown in FIG. 2, the upper end of the anchor strap 4 includes:
A hammer-shaped top is formed by increasing the plate thickness on the side facing the storage tank side plate 1 (this is called a hammerhead), and the above-mentioned hammer head comes into contact with the storage tank side plate 1. The abutment plate 11 provided as above is welded, and the upper end of the anchor strap 4 is brought into contact with the upper side of the abutment plate 11 at the site, and then both ends of the retainer plate 12 that presses the back of the anchor strap 4 are attached to the side plate 1 or It is welded to the back surface of the backing plate 11 to prevent the anchor strap 4 from coming off from the backing plate 11. In the example shown in FIG. 3, two backing plates 11 are arranged laterally at a distance slightly wider than the width of the anchor strap and fixed to the storage tank side plate 1 by welding, while the upper end of the anchor strap 4 on the back side is expanded. A hammer head is formed by a method such as thickness, and the anchor strap 4 is attached to two backing plates 1.
1, and press the press plate 12 between the two press plates 11 so that the upper edge is in contact with the lower edge of the hammer head.
The straps are arranged in a bridging manner, and both ends of the straps are welded to the contact plate 11 to prevent the strap 4 from coming off and to transmit tension through the strap.

Problems to be Solved by the Invention When a tensile force is applied to an anchor strap having a hammer head formed by increasing the plate thickness only on one side as shown in Figures 2 and 3, the anchor strap When the neutral axis in the thickness direction of the anchor strap shifts, a bending moment is applied in the out-of-plane direction of the anchor strap plate. In addition, depending on the positions of the abutting plate 11 and the storage tank side plate 1, the additional bending moment that the storage tank side plate receives may increase due to a shift in the position where the force is applied. Furthermore, considering the additional stress generated on the storage tank side plate 1 due to the restraint of the contact plate 11 when liquid is stored in the storage tank and internal pressure is applied, the width of the contact plate 11 is structurally large in the structure shown in FIG. Also, in the structure shown in FIG. 6, since the two contact plates 11 are integrally connected by the presser plate 12, the added stress due to restraint becomes large. Therefore, it is necessary to increase the strength of the holding plate mounting portion.

Purpose of the invention This invention solves the above-mentioned drawbacks of conventional above-ground storage tank anchor devices, eliminates the need for on-site welding, and
It is an object of the present invention to provide an anchor device that reduces the added stress when internal pressure is applied to a storage tank and the added moment when a tensile force is applied to an anchor strap.

Means for Solving the Problems In order to solve the above problems, the present invention provides an anchor device for an above-ground storage tank in which the upper part of the anchor strap is attached to the tank side plate and the lower part is attached to the base so that tension can be transmitted. The upper part of the anchor strap is formed into a horizontally enlarged shape, and two backing plates are fixed to the outer surface of the tank side plate at a distance of at least the width of the normal part of the anchor strap in the horizontal direction, and the anchor strap is passed between these two backing plates. The lower edge surface of the enlarged portion is brought into contact with the upwardly facing edge surface of the abutting plate to transmit force.

Function Since the anchor device of the present invention is constructed as described above, the anchor strap is in direct contact with the outer surface of the tank side plate near the upper end, and the tensile force acting on the anchor strap is within the range of the thickness of the anchor strap. Since the bending moment in the out-of-plane direction of the plate does not act on the anchor strap itself, the additional bending moment that acts on the storage tank side plate is transmitted to the backing plate fixed to the storage tank side plate. The positional deviation of is minimized, and the added moment can be minimized.

Further, when internal pressure is applied to the storage tank, the additional stress generated by the restraint of the contact plate can be made smaller than in the case of the conventional structure, since the width of the contact plate can be reduced.

Hereinafter, the present invention will be explained in detail based on embodiments shown in the drawings.

FIGS. 4a and 4b show the first embodiment of the present invention,
The upper end of the anchor strap 4 is laterally expanded into a T-shape. On the outer surface of the storage tank side plate 1, two backing plates 11 are attached with anchor straps 4 in the horizontal direction.
They are fixed by welding at intervals slightly larger than the width of the normal part. A presser plate 12 is separately welded and attached to the back surface of each contact plate 11. When the anchor strap 4 is inserted between the two backing plates 11 and the lower edge of the T-shaped portion at the upper end of the holding plate 12 is brought into contact with the upward facing edge of the backing plate 11, It is attached at a position where the back surface of the anchor strap 4 can be pressed by a presser plate 12. In the embodiment shown in the figure, the retaining plate 12 extends vertically to press down on the overhang at the upper end of the anchor strap, but it is not necessary to do so; The anchor strap may be held down by extending diagonally toward the center line, and the key is to prevent the holding plate from bridging the contact plates 11 on both sides and to separate the anchor strap 4 from the storage tank side plate 1. Any material may be used as long as it does not disengage the lower edge surface of the enlarged portion and the upwardly facing edge surface of the contact plate 11 by moving in the direction.

In this embodiment, the backing plate 11 and the holding plate 12 can be welded to the storage tank side plate 1 in advance at the factory, so the installation to the storage tank side plate 1 is completed by simply dropping the anchor strap 4 from above at the site. do.

The function of this anchor device is as described in the section of function.

Effects As described above, according to the present invention, on-site welding is not required for on-site installation of an anchor device for an above-ground storage tank, and additional stress generated on the side plate at the joint between the anchor strap and the side plate of the storage tank is reduced. By reducing the additional moment, reliability is improved and costs are reduced.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an overview of an above-ground storage tank and its anchor device, and Figs. 2 and 3 are views showing the mounting structure between the upper end of the anchor strap and the storage tank side plate of a conventional anchor device, and a is a storage tank side plate. Front view looking towards the outside, b is a vertical cross-sectional view perpendicular to this,
Figures 4a and 4b are similar views of embodiments of the invention, respectively. 1...Storage tank side plate, 3...Foundation, 4...Anchor strap, 11...Top plate, 12...Press plate.

Claims (1)

[Scope of utility model registration request] In an anchor device for an above-ground storage tank, in which the upper part of the anchor strap is attached to the tank side plate and the lower part is attached to the foundation so as to be able to transmit tension, the upper part of the anchor strap is formed in a shape that is expanded laterally, and
Two backing plates are fixed laterally to the outer surface of the storage tank side plates at a distance of at least the width of the normal part of the anchor strap, and the anchor strap is passed between these two backing plates so that the lower edge of the enlarged part is placed above the above-mentioned backing plates. An anchor device for an above-ground storage tank, characterized in that the anchor device is brought into contact with a facing edge surface and transmits force.