JPS5894697A - Low temperature storage - Google Patents

Abstract

PURPOSE:To enable to prevent rupture of a tank, by supporting the downward load by foundation piles, and absorbing relative displacement of the foundation piles and the bottom plate of the tank. CONSTITUTION:The bottom plate 2 of a tank is fixed to the top of foundation piles 8, so that the load acted to the piles 8 from above is transmitted to the foundation ground via the pipes 8. At the peripheral area of the bottom plate 2 of the tank, a lubricating metal or a Teflon pad 11 is attached to the top of each foundation pile 9. Further, seat plates 12 made, for instance, a stainless steel area attached to the lower surface of the bottom plate 2 at the parts thereof facing the foundation piles 9, so that the load acted from the above can be transmitted to the foundation ground via the foundation piles 9 but shearing between the bottom plate 2 and the tops of the piles 9 can be permitted. With such an arrangement, it is enabled to prevent rupture of the tank.

Description

DETAILED DESCRIPTION OF THE INVENTION Among above-ground low temperature tanks, there are types in which an outer tank is made of concrete and a free-standing inner tank made of a low temperature resistant material or a membrane-type inner tank is provided inside the outer tank.

This type of low-temperature tank has the feature that even if the inner tank is damaged and low-temperature liquid leaks, the outer tank will catch the leaked low-temperature liquid and prevent it from flowing outside. Consideration must be given to deformation caused by rapid cooling.

Figure 1 shows a conventional ground-type cryogenic tank of this type, with a bottom plate (2) made of reinforced concrete or prestressed concrete fixed to the pile cap of a foundation pile (11) driven into the ground (at), and a bottom plate (21) of the same bottom plate (21). 11 which is rigidly connected to!
The tank outer phase consists of the l walls (3) and the roof (4). Note that the roof (4) may be constructed of a copper roof. A compression-resistant bottom cold insulating material (51) is placed inside the bottom plate (21) of the tank outer tank, and a self-supporting tank (6) made of low-temperature metal is placed on top of the bottom plate (21). In the space between the tank and the outer tank, there is a non-pressure-resistant cold insulation material (7) made of a combination of perlite powder and glass wool, for example.
is loaded. Note that in place of the self-supporting tank (61), a membrane and a pressure-resistant cold insulating material may be combined. When the inside is cooled, the deformation of the outer tank shows a tendency as shown in Figure 2, and excessive stress is generated at the joint with the ground (alVC-bound foundation pile (1)), causing tank damage. There is a risk of causing a serious accident.

In other words, the relative displacement between the foundation pile and the tank bottom slab is relatively small in an appropriate range from the center of the tank, and in a range outside this range, horizontal shear occurs between the pile head and the bottom slab. This caused shear failure between the foundation pile and the tank bottom plate.
At the outermost part of the bottom slab, the lift of the bottom slab reaches its maximum, causing failure at the joint with the pile.

The present invention has been proposed in order to eliminate such drawbacks, and in a low-temperature tank equipped with a concrete outer tank, the connection between the tank bottom plate and the foundation pile is fixed within an appropriate range from the center of the tank, The outer and inner areas have a support structure that transmits supporting force but allows shearing displacement, and the outermost pile is loosely fitted into the long hole in the bottom plate, and the pile head is configured to share the pulling force. This relates to a low temperature tank characterized by:

In the present invention, the foundation piles for the concrete outer tank bottom slab in a low-temperature tank are divided into piles for transmitting loads from above to the foundation ground and piles for preventing the outer periphery of the bottom slab from lifting. The relative displacement between the bottom slab and the pile head is relatively small within an appropriate range from the center of the tank. It consists of a foundation pile that is connected to the bottom slab so that the shear deviation with the bottom slab can be tolerated. It consists of foundation piles.

Therefore, when the low-temperature liquid in the tank leaks, in-plane contraction mainly occurs in the bottom slab, and the relative deformation between the bottom slab and the four foundation piles within an appropriate range from the center of the tank is relatively small, so that the bottom slab cannot be fixed to the bottom slab. The load from above is transmitted to the foundation ground by the foundation pile, and the amount of relative deformation between the bottom slab and the pile cap in the range outward from the above range is permissible, and shearing deviation in the bottom slab can be allowed in places exceeding the range. Although the downward load is supported by the foundation piles connected in this way, the load generated between the bottom slab and the pile cap is reduced so that the relative displacement with the bottom slab can be absorbed, thereby preventing tank destruction. It is something.

In addition, as the top surface of the bottom plate is cooled first due to the leakage of low-temperature liquid, it also tends to bend upwards, and if this is left untreated, secondary damage to piping and other parts may occur, causing further damage. In order to suppress this deformation, at the outer periphery of the bottom slab where the moment to suppress f-deformation can be effectively exerted, the bottom slab is prevented from retaining by the pile cap of the foundation pile that is loosely fitted into the long through hole of the bottom slab. Therefore, in order to share the pull-out load, the foundation pile allows the bottom slab to move due to contraction, but transfers the deformation suppressing load to the bottom slab, thus preventing excessive stress from being applied to the joint between the tank bottom slab and the foundation pile. This is designed to prevent tank damage accidents from occurring.

The present invention will be described below with reference to illustrated embodiments.

In Figures 6 and 6, the tank bottom plate (2) is supported by the foundation pile +819iflO)Vc.

Therefore, within an appropriate range from the center of the tank where the relative displacement between the tank bottom plate and the pile head is relatively small, the bottom plate (2) is fixed to the pile head of the foundation pile (8), and the load from above is equally absorbed. It is designed to be transmitted to the foundation ground via the foundation piles (8).

Outside the above range @, a foundation pile (lubricated metal or Teflon old Patsubi on the pile head of 91) is installed, and a bottom plate facing it (for example, a stainless steel receiving plate (one plate) is installed on the bottom surface of 21). The load from the ■ side is handled by the foundation pile (9
1 to the foundation ground, and is configured to allow shear deviation between the bottom slab (2) and the pile head of the foundation pile (9).

In addition, an oval through hole Q31 is bored in the outermost opening of the bottom slab (2), and the pile head of the foundation pile into which the through hole (13) is loosely fitted is
The foundation pile 0 (1) has a force that prevents the lifting deformation of the bottom slab (2).
Bracket (141) for transmitting information to the frame of the

Although the present invention has been described above with reference to embodiments, the present invention is, of course, not limited to such embodiments, and may be modified in various ways without departing from the spirit of the present invention. be.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a conventional low-temperature tank, FIG. 2 is a partial vertical cross-sectional view showing its deformed state, FIG. 6 is a vertical cross-sectional view showing an embodiment of the low-temperature tank according to the present invention, and FIG. is ■ in Figure 6
FIG. 5 is an enlarged view of the part shown in FIG. (2)...Bottom plate f81t91fl(t...
Foundation pile replacement agent: 2 patent attorneys and non-Kaimoto important literary figures

Claims (1)

[Claims] In a low-temperature tank with a concrete IJ-cont outer tank, the connection between the tank bottom plate and the foundation pile is fixed within an appropriate range from the center of the tank, and the support force is transmitted outside of that, but shearing displacement is allowed. 1. A low-temperature tank having a supporting structure, wherein the outermost pile is loosely fitted into the long through hole of the bottom plate, and the pile head is configured to share the pulling force.