JPS6336138Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Field of industrial application The present invention relates to a rain cover structure that is installed in the outer space of a temporary roof during the assembly and construction of a large storage tank for storing gases, liquids, or mixtures thereof.

(b) Prior art and its problems FIG. 1 is an explanatory sectional view of a metal double-shell storage tank as an example to which the present invention is applied. The storage tank to which the present invention is applied is large-sized and assembled on-site, and the construction takes a long period of time, such as several months, and there is no roof between the tanks, so the problem occurs between the inner tank roof 1 and the inner tank side plate 2. If the space 18 is left empty, rainwater or the like will enter the inner tank side plate 2 due to rain or snowfall, and the upper surface of the outer tank bottom plate 3, the upper and lower surfaces of the inner tank annual plate 4, etc. cause corrosion on exposed surfaces,
This causes various problems such as deterioration of the performance of the ring concrete 5 which requires heat insulation properties. In addition, 6 in the figure is a temporary pillar that supports the inner tank roof 1 during construction of the storage tank, and the outer tank side plate 7 holds the outer tank roof that covers the inner tank after the construction of the inner tank is completed, or supports the cold insulation material of the inner tank. It is for.

Two examples of conventional measures against rainwater intrusion will be described with reference to FIGS. 2 and 3.

Figure 2 shows that a water stop plate 8 is installed vertically on the inner tank annual plate 4 below the outer periphery of the inner tank roof 1, which is used as a temporary roof 11 during assembly, to prevent rainwater from entering. The connecting surfaces are welded all around, and a curtain 9 is placed between the inside of the outer periphery of the inner tank roof 1 and the outside of the water stop plate 8, and a short curtain 10 is further provided on the outer periphery of the inner tank roof 1 to prevent rainwater. However, this construction method prevents the corrosion of the annual plate 4 that occurs during the construction period, the welding installation and removal of the water stop plate 8 at the beginning and end of construction, and the corrosion after the water stop plate 8 is removed. It is necessary to conduct a material inspection of the welded portion on the annual plate 4.

Figure 3 shows that a temporary roof 16 is provided from the lower surface of the outer periphery of the inner tank roof 1 that is being assembled, and a rain gutter 12 is fixed to the outer periphery of the roof 16 with a support member 13, and the rainwater is collected in the rain gutter 12. Rainwater, etc. is discharged through a suitable number of pipes 14 installed separately, and a plastic putty, gasket packing, etc. A sealing member 15 is attached or inserted to close the tank, and the attached roof 16 and the inner tank side plate 2 are fixed at a constant height relationship.

In this conventional construction method, the rain cover structure other than the attached roof 16 attached to the temporary roof 11 is fabricated and assembled along the inner tank side plate 2 so that the sealing member 15 can be attached, so this conventional construction method is a hypothetical construction. However, the same caution as in the main work is required, and when completing the main work to form the inner tank roof 1 on the upper edge of the inner tank side plate 2 of the storage tank, the temporary roof 11 is attached to the inner tank side plate 8. The attached roof 16 is temporarily installed in connection with the rain cover structure for later storage;
There is a drawback that miscellaneous works such as removing the rain gutter 12 and the sealing member 15 require a lot of effort.

(c) Means for solving the problems (explanation of the present invention) The present invention not only solves the problems of the prior art described above by using a simple structure such as a roof, but also eliminates the need for a temporary roof during construction. It can be changed very easily according to the requirements.

In this invention, the roof that will eventually become the inner tank roof together with the Natsukuru plate 1c is used as a temporary roof during storage tank construction, and a temporary roof is provided around the outer periphery of the inner tank roof. A flexible sealing member is provided that covers the space 18 between the side wall and contacts the side wall of the storage tank, and the remaining assembly work is carried out below the structure other than the temporary roof and attached roof, that is, the rain cover structure. Applicable to storage tank assembly work in which, after installation, the rain cover structure temporarily installed between the temporary roof and the side plate is removed, and the temporary roof is fixed to the upper edge of the side plate together with the knuckle plate to form an inner tank roof. According to the present invention, a rain protection structure for the outer periphery of the temporary roof is disclosed that prevents rain etc. from entering during the assembly work and facilitates the removal of the attached roof and the assembly work in the subsequent process. It is something.

The inner tank roof 1 of the present invention is supported by a temporary pillar (not shown) having a suitable number of flat plate pieces at the bottom of the inner tank roof 1 at appropriate positions on the outer periphery of the inner tank roof 1. This is done by simply placing it on the plate 4.

(d) Example The rain protection structure around the outer periphery of the temporary roof of the present invention is shown in Fig. 4. Inner tank roof 1 is roof plate 1
The frame 1b supports the roof shingle 1a and provides the necessary strength to the entire roof. There are many. The skeleton 1b in FIG. 4 only shows the tip of this skeleton. In the present invention, the frame of the attached roof 16 is bolted to the bolt hole drilled at the tip of the frame as shown in the figure, and the attached roof 16 is attached to the frame 1.
A roof plate 16a is stretched around the entire circumference on top of the attached roof 16, and a supporting metal fitting 19 having a Z-shaped cross section or the like is fixed with bolts or the like on the roof plate 16a on the tip of the frame 16b of the attached roof 16. Upper end of 19 and inner tank side plate 2
A sealing material 20 having elasticity and flexibility, such as rubber, is fixed over the entire circumference of the attached roof 16 between the inner surface of the attached roof 16, and a drain pipe 21 is installed in a place near the outer peripheral edge of the attached roof 16 where rainwater collects. It has a structure in which rainwater is discharged to the outside of the storage tank construction site.

In addition, when converting the inner tank roof 1 to a regular roof, the bolt holes at the tip of the frame 1b of the temporary roof 11 to which the frame 16b of the attached roof 16 is attached to the temporary roof 11 can be used as is for later assembly work. It is possible.

(e) Function and effect of the invention The rain cover structure of the invention has a simpler structure compared to conventional methods, does not require strict precision in processing and assembly, and can be installed and removed without welding to the storage tank body. It's as simple as removing the bolt,
Since there is no damage to the members that is likely to occur during removal, which is the case with the conventional method of attaching temporary members to the storage tank body by welding, there is no need to conduct non-destructive inspections of the parts after removal. The sealing material 20 provided to close between the outer periphery of the attached roof 16 and the side wall is made of elastic and flexible rubber, etc., so that it is sufficiently protected from rain and can be used during construction work. It is easy to adjust the height by raising and lowering the temporary roof if necessary, and as mentioned above, even when the inner tank roof 1 is made regular, the bolt holes in the frame can be used as they are, making the construction easy. And it can be done quickly.

[Brief explanation of the drawing]

FIG. 1 is an explanatory cross-sectional view of an example of a metal double-shell storage tank to which the structure of the present invention is applied, and FIGS. 2 and 3 are explanatory cross-sectional views of prior art of the present invention,
FIG. 4 is a diagram showing the rain cover structure of the present invention. DESCRIPTION OF SYMBOLS 1... Inner tank roof, 1a... Roof board, 1b... Frame, 1c... Nutsuru plate, 16... Roof, 17... Bottom plate, 18... Space part, 19... Support metal fittings, 20... ...Sealing material, 21...Drain pipe.

Claims (1)

[Scope of utility model registration request] A temporary roof 11 is arranged inside the storage tank, and the temporary roof 1
The temporary roof 11 and the side plate 2 in a method of constructing a storage tank by fixing the inner tank roof 1 formed by the inner tank roof 1 formed by the inner tank roof 1 and the nutcle plate 1c arranged on the outer edge of the inner tank roof 1 to the upper edge of the side plate 2 of the storage tank. Space 18 created between
The roof 1 is attached to the end of the frame 1b of the temporary roof 11 with a substantially constant space width 18a left on the side plate 2 side of the space 18 during construction.
A frame 16b of No. 6 is provided, a roof plate 16a is stretched over the frame 16b, a supporting metal fitting 19 is continuously provided around the roof plate 16a, and the top of the supporting metal fitting 19 has elasticity and flexibility. One end of the sealing material 20 is fixed, and the other end of the sealing material 20 is brought into elastic contact with the side plate 2, so that the space width 1 is
A rain protection structure around the outer periphery of a temporary roof during construction of a storage tank, which is characterized by covering 8a.