JPS5952265B2 - Connection method between side plate and roof of cylindrical tank with fixed roof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improved method of joining the side plate and the roof in a cylindrical tank with a fixed roof.

[Prior Art] Roof structures can be roughly divided into those designed for strength using only roof plates and those designed with a combination structure of roof plates and roof bones.

The loads that act on a roof are classified into two types: internal pressure and external pressure, but in cases where a reinforced roof structure is adopted, the external pressure (roof's own weight, gas load) is more important than the internal pressure (gas pressure) as a design consideration. Generally, the specific gravity of the tank (pressure, wind, snow, etc.) is greater than that of the roof, such as the roof of a normal pressure or low pressure tank.

・ Advantages of reinforced roof structures include reducing the total weight of the roof compared to designing with only roof plates when the tank becomes larger, and simplifying the construction method by simply assembling the roof frame and attaching the roof plates, making it cheaper. It is about becoming something.

Therefore, normal pressure or low pressure oil storage (liquid), which is currently enlarged.
This reinforced roof structure is commonly used for tanks.
Conventionally, in tanks with this type of reinforced roof structure, the joint structure between the side plate and the roof is as clear from Figures 2 and 3.
To connect the side plate and the roof, the roof frame 1'' is fixed to the side plate 3'' via the bracket 2'', and the roof plate 4'' is attached to the roof frame 1'' in advance to prevent rainwater from entering or to seal the tank.
It was fixed at

Further, the roof's own weight and external load are transmitted along the roof bone and transmitted from the rib bracket 2'' to the side plate 3''. To explain the roof construction method for this type of joint, the roof is assembled on the ground or at the bottom of the tank at the tank construction site (on-site) in parallel with the tank side panel assembly work, in order to shorten the construction period and facilitate construction. After the side panels are completed, the roof is lifted to a predetermined position on the top of the side panels using a roof lifting method such as jacking up or air raising, and is temporarily fixed to the top of the side panels. For this temporary fixing, as shown in FIG.
'', the roof frame 1'' is temporarily fixed to the reinforcing ring 5'' using an assembly jig 6'' consisting of a geta jig 6'', a top jig 6'', etc., and then the side plate 3'' is fixed by working inside the tank. Roof frame 1″
After the brackets 2'' connecting the roof panels 2'' were welded, and the roof panels 4'' were welded, the temporary fixing assembly jig 6'' was removed.

In this way, the conventional joint construction method has the disadvantage of being unstable, requiring a long period of time in the air, in which the roof is hoisted up by jacking up or air raising the assembled roof at the site. Using a jig leads to the above-mentioned long-term suspension and maintenance, and the adjustment work when installing this jig is complicated and requires hot wires. There are a number of drawbacks, such as the fact that work is often done at heights, resulting in poor work efficiency, delays in construction schedules, and dangers.

[Purpose of the invention]

The present invention was made in view of these circumstances, and solves the problems of the prior art by simple and rational means.
The object is to provide a joining method that makes it easy to connect the side panels and the roof frame, eliminates the need to lift and hold the roof for a long time, stops the roof members from deforming, and facilitates installation at the designed dimension position.

[Description of Embodiments] There are two embodiments of the joint construction method of the present invention.

The first embodiment is as shown in Fig. 7A.
On the inside of the uppermost side plate 1 assembled into a cylindrical shape, and
At appropriate intervals in the vertical direction, specifically, at locations corresponding to the roof ribs constituting the roof member, which will be described later, the roof ribs 3, which will be described later, pass through two parallel brackets 2 as shown in FIG. Weld or rivet it in advance with a sufficient gap. Next, the roof frame 3 constituting the roof member, which was assembled without attaching the outermost roof plate at the site, is passed between the two brackets 2 like a mouth, and
After lifting up the roof bone end above the bracket 2, the insertion plate 4 is placed on both brackets 2 as shown in C, and then the roof member is gradually lowered as shown in 2 and the roof bone 3 is lifted up. After placing the end on the insertion plate 4, use the open part of the roof member to which the outermost roof plate is not attached, and work from outside the tank as shown in Figure 9 A. As a means to prevent horizontal deformation of the roof, an adjustment spacer 6 is inserted and adjusted between the side plate 1 and the outer edge of the roof frame 3 to stop the deformation of the roof member, and after the installation is adjusted to the design dimensions, The bracket 2, insertion plate 4, and roof frame 3 are welded to each other, and the roof plate is attached to the open portion. This embodiment is suitable for use when lifting up a roof member when it is impossible to rotate the roof member, such as when using air raising. It is arranged to rise as it passes, after which means are taken to insert the insertion plate 4 between the bracket 2 and the roof rib 3.

The embodiment shown in FIG. 8 shows an embodiment in which the roof member can be rotated in a lifted up state, and in this case,
As shown in FIG. 8A, one or more parallel brackets 2 are welded in advance to the side plate 1 in the same manner as in the above embodiment, and on top of these, a plate corresponding to the insertion plate in the above embodiment is welded. Weld 4.

Then, as shown in the figure, the roof member is lifted up so that the roof rib 3 passes through the unrelated position shown by the arrow on this bracket 2 part, and the roof member is lifted up with the end of the roof rib 3 located above the bracket 2. After rotating the roof frame 3 and positioning it on the plate 4, lower the roof member as shown in C and place the roof frame 3 on the plate 4. After inserting an adjustment spacer 9 between the side plate and the roof frame as a means to prevent horizontal deformation of 1, the upper end and the outermost roof plate 5 are welded to complete the joint construction method.

Further, as shown in E, a cassette plate 7 may be welded to the gap between the side plate 1 and the roof frame if necessary. Figure 10A shows the shape material used as the bracket 2 material, and the opening is the plate 4 (
Alternatively, an example is shown in which a profile is used as the insertion plate 4).

〔Effect of the invention〕

According to the present invention, the lift-up of the roof member is released by locking the roof frame to the plate on the bracket without having to maintain the lift-up for a long time, and
Utilizing the open part of the roof member, temporary fixation of the side plate and roof frame can be achieved in a short time with a comfortable working posture, and it has the advantage of not requiring any assembly jigs unlike conventional methods.

Furthermore, the roof frame and side plates can be fixed from outside the tank using the open part of the roof member, which increases safety.Furthermore, work inside the tank can be done after the roof members have been fixed, further improving safety. sell.

In addition, by making brackets, insert plates, plates, etc. permanent members, it is possible to simplify construction and improve strength.In particular, brackets play the role of a stiffener that restrains horizontal deformation of the roof, and strengthen the roof bones. If the load is transferred, changes in the shape of the roof can be prevented. Furthermore, in the present invention, after the roof frame is placed on an insertion plate inserted onto the bracket or a plate fixed on the bracket in advance, an adjustment spacer is inserted between the uppermost side plate and the outer end surface of the roof frame. This spacer prevents horizontal deformation of the tank roof and makes it easy to adjust the eccentricity of the roof, making it easy to install it in the designed position.Furthermore, this spacer allows the horizontal force of the roof to be transmitted from the roof bone to the side panels. However, it has excellent features such as being able to prevent deformation due to the strength of the side plate in the circumferential direction.

[Brief explanation of the drawing]

Figure] is a partially cutaway front view of a cylindrical tank with a fixed roof, Figures 2 and 3 are side sectional views of the main parts showing the conventional side plate and roof rib joint structure, and Figure 4 is the conventional An explanatory diagram showing the state in which an assembly jig is used in the joining construction method, FIG. 5 is a side sectional view of the main part showing the joint structure of the side plate and roof frame by the construction method of the present invention, and FIG. 6 is a front view of the same as above. Figure 7 A, mouth, C, and 2 are explanatory diagrams of the first embodiment. Figure 8 A, mouth, C, 2, and Ho are explanatory diagrams of the second embodiment. Figure 9 A and mouth use spacers. Fig. 10A is a side sectional view of the main part showing the state, and a front view of the main part of an embodiment in which the bracket and the plate are made of shaped members, respectively.

Claims (1)

[Claims] 1 (a) At a required location inside the uppermost side plate assembled into a cylindrical shape, specifically, at a location relative to the roof rib constituting the roof member, a gap parallel to the vertical direction of the side plate and through which the roof rib passes. (b) Next, the outer roof frame of the roof member is assembled in advance on the ground or at the bottom of the tank, and the outermost roof plate is not attached. Pass the end between the above two sets of brackets, or pass through the outside of the bracket with a plate horizontally installed on the top surface, lift the roof bone end slightly above the top surface of the bracket, and then After each roof frame is inserted between the upper surface of a pair of brackets and the roof frame, and each roof frame is placed on the insertion plate placed on the bracket or the plate fixed on the bracket, (c) Utilizing the open part of the roof member where the outer roof plate is not attached, adjust spacers are inserted between the uppermost side plate and the outer edge of the roof frame as appropriate to prevent horizontal deformation of the roof member. Stop the deformation of the roof member and install it at the design dimension position. (d) Next, using the open part of the roof member, weld the necessary parts of the bracket, insertion plate, and roof frame outside the tank. A method of joining the side plates and roof of a cylindrical tank with a fixed roof, which is characterized by fixing the roof and then attaching the outermost roof plate.