JPS5952266B2 - Method for joining the nutkl plate and roof in a cylindrical tank with a fixed roof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical field of industrial application] The present invention relates to a method for joining a knuckle plate and a roof in a cylindrical tank with a fixed roof.

[Conventional technology] Conventionally, in order to shorten the construction period and ease the construction of general large tanks, as shown in Fig. 3, at the tank construction site, the tank side plate 1 was constructed in parallel with the construction as shown in A. Then, the roof 2 is assembled on the ground or on the bottom of the tank as shown in Figure 1, and after the side plate 1 is assembled, a knuckle plate 3 is attached to the top of the side plate 1 as shown in Figure 3. Be possessed.

Then, the roof 2 is lifted up as shown in the figure. As for this method of hoisting the roof, the Jyatsuki Atsupue method is generally used. When the roof is lifted into position, the roof frame and the knuckle plate 3 are fixed by a temporary fixing jig 4. After that, go inside the tank and weld the connecting cassette plate to the knuckle plate and roof frame to complete the construction as shown in E. Figures 4 and 5 show joint structures constructed by the conventional joint construction method as described above, in which 1 in Figure 4 is a side plate, 2 is a roof, 2' is a roof frame, 2
"" is a roof plate, 3 is a knuckle plate, 3' is a knuckle ring, and 5 is a bracket.

Also, in Figure 5, 1 is the side plate, 2 is the roof, 2'' is the roof frame, 2''
'' is a roof plate, 5 is a bracket. Figure 6 shows jig 4.
This shows the state in which the roof 2'' and the knuckle plate 3 are temporarily fixed using the knuckle plate.
'' must be welded, and work such as jig installation and adjustment is complicated, and in addition, work at heights is required, which is time consuming and dangerous.

In the figure, 4'' is a geta jig. Although not shown in the drawings, in addition to the above-mentioned construction method, there is a conventional construction method in which the upper end edge of the knuckle plate 3 is attached to the roof 2, and then the lower end edge of the knuckle plate 3 is installed and fixed on the side plate. This is not a good method for constructing large tanks, as the construction accuracy of the side panels and nutscule plates must be extremely strict.In this way, the conventional joint construction method is not suitable for construction of large tanks. , the roof is hoisted by air raising, which has the disadvantage of being unstable due to the so-called hanging time in the air for a long time, and the use of assembly jigs leads to the above-mentioned long period of holding the roof up. Adjustment and other work when installing this jig is complicated and requires skill.Furthermore, work is often performed at high places in narrow spaces inside the tank, resulting in poor work efficiency and delays in the construction period, which can be dangerous. There are a number of drawbacks, including:

Furthermore, the above-mentioned conventional example has the disadvantage that bending deformation of the knuckle plate, roof frame, and roof plate occurs during the temporary fixation of the knuckle plate and the roof during roof installation. [Object of the invention] The present invention was made in view of the above circumstances, and
Solving the problems of the conventional technology by simple and rational means, making it easier to connect the nut plate to the roof frame, eliminating the need to lift the roof for a long time, stopping the deformation of the roof members, and improving the design dimensions. The purpose is to provide a joint construction method that allows for easy positioning and installation.

[Explanation of Examples]

An embodiment of the construction method of the present invention will be described with reference to FIG. 9.

The lower edge of the knuckle plate 11 is welded to the upper end of the uppermost side plate 10 (not shown) constructed in a cylindrical shape as shown in A and A'', and the knuckle plate 11 corresponding to the roof frame 13'' of the roof 13 is welded. On the inside of the plate 11, a locking member 12 having an inverted T-shape whose end face is aligned in the radial direction of the tank is shaped like an "A", and a knuckle ring 11'' are welded. A'' is A- of A-
A cross section taken along line A is shown. Next, as shown in the figure, an open part is formed on the outer periphery without constructing the outermost roof plate, which is assembled on-site, and has a diameter slightly larger than the inner diameter of the upper end of the above-mentioned knuckle plate 11. After restoring the small roof 13 to a position slightly above the inner end of the locking member 12 using conventional lifting means, the locking member 12 attached to the knuckle plate 11 is placed as shown in FIG. Insert and lock the key joint 14.

As shown in FIG. 8, this key joint 14 consists of two parallel vertical insertion pieces 14'' that sandwich a vertical piece 12'' of an inverted T-shaped locking member 12 welded to the knuckle plate 11. and a vertical plate 14″″ fixing the inner end of the vertical plate 14″″.
It consists of a horizontal plate 14'' to which the lower side of the vertical plate 14'' and the inner end of the lower side of the insertion piece 14'' are welded, and the horizontal plate 14'' and the insertion piece 14''
between the outer lower edge of the horizontal plate portion 12 of the locking member 12
A gap 15 is formed for inserting and holding "". Then, as shown in 2, the roof 13 is lowered, and the end of the roof rib 13'' is engaged and placed on the inner end of the horizontal plate 14'' constituting the key joint 14, and temporarily fixed.

In this state, e. More specifically, as shown in FIG. 10, a spacer 16 was inserted between the end of the roof frame 13'' and the inner surface of the vertical plate 1'' by using the outer peripheral open part of the roof 13. Afterwards, using the outer peripheral open part of the roof, the locking member 12,
The key joint 14, roof frame 13'', and nutcle plate are welded and fixed, and then the outermost roof plate 13'' is welded to the roof 13, key joint 14, and nutcle plate 11 as shown in Fig. [Effect of the Invention] As described above, according to the present invention, the lift-up of the roof is released by locking the key joint to the roof frame without holding the lift-up of the roof for a long time. Moreover, by using the open part formed on the outer periphery of the roof, you can work in a comfortable working position and in a short time.
It is possible to temporarily fix the nuts and bolts to the roof frame, and it has the advantage of not requiring any assembly jigs unlike conventional construction methods.

In addition, the roof ribs, key joints, locking members, nutcle plates, etc. can be fixed from outside the tank using the open area around the roof, which is very safe, and work inside the tank can be done after the roof is fixed. Therefore, safety can be further improved. Also,
By making locking members, key joints, spacers, etc. permanent members, construction can be simplified and strength improved. In particular, locking members play the role of a stiffener that restrains horizontal deformation of the roof. However, if the roof bone load is transmitted, changes in the shape of the roof can be prevented.

Furthermore, in the present invention, after the end of the roof bone is supported and temporarily fixed on the key joint, a spacer is inserted between the key joint and the outer end surface of the roof bone. It is easy to prevent the direction and adjust the eccentricity of the roof, and it is easy to install it in the design dimension position.Furthermore, with this spacer, the horizontal force of the roof is transmitted from the roof bone to the side plate through the key joint, and the side plate is It has excellent features such as being able to prevent deformation due to circumferential strength.

[Brief explanation of the drawing]

Figures 1 and 2 are partially cutaway front views of a cylindrical tank with a fixed roof, Figures 3A to 3A are explanatory diagrams of conventional construction methods, and Figures 4 and 5
The figure is a cross-sectional view of the main part showing a conventional joining structure, Figure 6 is an explanatory diagram showing a joining part of the conventional method using a temporary fixing jig, and Figure 7 is a cross-sectional view of the main part of a joint constructed using the method of the present invention. FIG. 8 is a partially cutaway exploded perspective view showing the relationship between the locking member and the key joint; FIGS.
FIG. 10 is a side sectional view of the joint showing the use of a spacer.

Claims (1)

[Claims] 1 (a) Build a cylindrical tank side wall by stacking side plates one after another, weld a knuckle plate onto the top side plate, and lift up the roof member constructed on the ground.
In this joint construction method in which the roof member is welded and fixed to the knuckle plate, (b) an inverted T-shaped locking is provided on the inside of the knuckle plate on the side plate corresponding to the roof frame of the roof member in the radial direction of the tank; (c) is assembled on-site, has a diameter slightly smaller than the inner diameter between the upper ends of the knuckle plate, and does not have the outermost roof plate attached;
After the roof member with the roof bone end exposed is lifted up slightly above the locking member, a key joint having a length that allows the roof bone end to be placed on the locking member is inserted and locked. , the roof member is lowered to support the end of the roof rib on the key joint, and then the open part of the roof member is used between the key joint and the outer end of the roof rib to prevent roof deformation. (d) Next, using the open part of the roof member, the locking member, key joint,
A construction method for joining the knuckle plate and the roof in a cylindrical tank with a fixed roof, which is characterized by welding the roof frame and then joining the outermost roof plate to the knuckle plate.