JPH05214794A - Suspending type staircase in liquid tank - Google Patents

Abstract

PURPOSE:To simplify installing work by suspending a spiral staircase from the roof inner surface of a liquid tank through an universal hinge. CONSTITUTION:An universal hinge 3 has a chain housing 3a mounted on a roof and a chain stopper 3c pivotally supported on a spherical receiving seat 3b provided on the inner surface of the housing 3a in such a manner as being capable of sliding. A spiral staircase is suspended from the inner surface of the roof 2 of a liquid tank 1 through the hinge 3, and the staircase 4 is suspended by use of a chain 5 between the hinge 3 and the staircase 4 so that the staircase 4 is more freely movable. A weigh 6 is mounted on the lower stage to increase the stability at the time of a person going up and down. Thus, the foundation of the staircase is not required, the installing steps are shortened, and the work can be simplified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suspended staircase applied to the inner staircase of a liquid storage tank.

[0002]

2. Description of the Related Art An internal staircase of a conventional liquid storage tank is shown in FIG.
As shown in, stairs 03 along the inner surface of the side plate 02 of the storage tank 01
4 are sequentially provided through the landing 04, or as shown in FIG. 4, a stairs foundation 05 is provided on the bottom plate of the storage tank 01, and the stairs 03 are independently provided to the manhole 0.
It is known that it is connected to an external stairway 07 via 6.

[0003]

However, in the stairs along the inner surface of the storage tank side plate of FIG. 3, since the manufacturing accuracy of the stairs and the installation accuracy of the side plates are not sufficiently ensured, a mounting problem occurs on the curved surface of the stairs, and Rework occurs frequently. The stairs will be installed after the side plate installation is completed, and the painting of the inner surface of the side plate will be the subsequent process. Therefore, the coating of the inner surface of the side plate cannot be started immediately after the installation of the side plate is completed, and the process is extended by the amount of the stair mounting work.

In the case of the independent staircase shown in FIG. 4, a separate step from the side plate installation is required, but a stair foundation must be provided during bottom plate construction. In addition, the larger the capacity of the storage tank, the higher the height of the independent stairs, and the larger the horizontal external force acting on the stairs due to the sloshing of the liquid in the storage tank during an earthquake, the strength of the main structure members of the stairs is increased. It is necessary to make the staircase foundation as a cantilever fixing point very large.

The present invention was developed to address such problems, and an object thereof is to provide a stairway having a simple installation process which does not require a foundation work for the staircase.

[0006]

The structure of the present invention for achieving the above object will be described with reference to FIGS. 1 and 2 corresponding to the embodiments. The present invention is universal on the inner surface of a roof 2 of a liquid storage tank 1. It is characterized in that the spiral staircase 4 is suspended via a hinge 3.

[0007]

According to the present invention, the installation of the spiral staircase suspended by the above means on the inner surface of the roof of the liquid storage tank through the universal hinge is a completely different process from the installation of the storage tank side plate and the coating of the storage tank side plate. Not only that, but the installation itself only attaches the spiral stairs to the universal hinge provided on the inner surface of the roof, so it is expected that the process will be greatly shortened.
In addition, since it is a suspension type, the stair foundation is not necessary and the spiral stairs can freely swing, so the horizontal external force acting on the staircase due to liquid sloshing during an earthquake can be released and the cost can be reduced because the staircase member can be small and the spiral The staircase itself is compact, and the horizontal external force acting on the staircase can be made almost the same for earthquakes in any direction, and the drag coefficient can be reduced by making the overall shape a cylinder.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. 1 is a liquid storage tank, 2 is a roof, and a spiral staircase 4 is provided on the inner surface of the roof 2 via a universal hinge 3.
Was hung. It should be noted that, between the universal hinge 3 and the spiral staircase 4, a chain 5 is hung between the universal hinge 3 and the spiral staircase 4 so that the spiral staircase can move more freely.
A weight 6 is attached to the lower end to increase the stability when a person goes up and down in an empty space. Also, the universal hinge 3
As shown in FIG. 2, the chain housing 3a is attached to the roof 2, and the chain stopper 3c is slidably supported by the spherical seat 3b provided on the inner surface of the chain housing 3a. I installed 5. In the figure, 7 indicates a manhole.

[0009]

As described above, according to the present invention, since the spiral staircase is suspended on the inner surface of the roof of the liquid storage tank through the universal hinge, the foundation of the staircase is unnecessary and the installation process thereof is greatly shortened. In addition, since the stairs can freely swing, the horizontal external force acting on the stairs due to liquid sloshing during an earthquake can be released and the stairs can be downsized, and the spiral staircase itself can be made compact as a whole to reduce the drag coefficient. Have an effect.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 is an enlarged view of part A in FIG.

FIG. 3 shows a conventional example, where a is a plan view and b is a in FIG.
-A line development view.

FIG. 4 shows another conventional example, in which a is a plan view and b is a half-cut side view.

[Explanation of symbols]

 1 Liquid storage tank 2 Roof 3 Universal hinge 4 Spiral stairs

Claims (1)

[Claims] 1. A suspension staircase inside a liquid storage tank, wherein a spiral staircase is hung on the inner surface of the roof of the liquid storage tank via a universal hinge.