JPS58135207A - Manufacture of large-diameter cylindrical structure - Google Patents

Abstract

PURPOSE:To safely and rapidly assemble a cylindrical cell by pivotally and radially supporting a curved face-forming base on the periphery of an assembling part. CONSTITUTION:A curved face-forming base 2 is set radially and pivotally on the periphery of a circular assembling part 1, and steel plates are arranged on the curved face-forming base 2 to form a curved plate 4. Then, the curved face- forming base 2 is erected at its basal pivotal fitting part 3 as an axis, the curved plates 4 are cylindrically arranged on the periphery of the assembling part 1, and the joint parts of the curved plates 4 are welded to build up a cylindrical cell.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention efficiently constructs large-diameter cylindrical structures such as steel plate cells used for seawall construction, rock wall construction, and bridge lower cofferdam construction at marine airports, waste disposal sites, artificial islands, etc. It relates to a method of manufacturing well.

Conventionally, when manufacturing a large-diameter cylindrical structure used for the above-mentioned purposes, the cylindrical structure is divided into a plurality of curved plates in the circumferential direction, and these curved plates (block plates) are connected. This makes it a cylindrical structure.

The method for manufacturing the curved plate is as follows: First, steel plates are welded to produce a wide-area connected steel plate having the area of the curved plate;
Next, a vertical lip is provided on one side of this connecting steel plate, and this connecting steel plate is placed on a curved surface forming table whose supporting portion forms a curved surface to form a curved surface plate, and on this curved surface forming table, a vertical lip is provided on one side of the curved surface plate. The ribs are welded to intersect vertically and horizontally inside the curved plate. If necessary, a reinforcing material is provided on the back plate of the curved plate assembled on the curved surface forming table to prevent the curved plate from deforming during movement.

The curved plate manufactured as described above is placed on an assembly table with a foundation set at a predetermined location, and other curved plates are erected one after another using this curved plate as a reference, and the joints are welded. It is formed into a cylindrical shape.

When assembling the front 81-cylindrical structure, two cranes are used to lift the curved plates and move and assemble them.

The cylindrical structure used for the above purpose has a diameter of, for example, 15 m.
1 height is 20 m, so the vertical side of the curved board is 20 m.
The horizontal side of m1 is 47m, making it quite large. Therefore, if this curved board is suspended by a crane truck as described above and is moved by a wind, it will be exposed to a large wind force, and the wind force will agitate the curved board and cause it to sway. Because it is difficult and dangerous to fix the equipment in place, it becomes impossible to work in the presence of wind. Furthermore, when the curved plates are aligned in a cylindrical shape by the above-described operation, the positioning work is time-consuming, resulting in a large amount of risk and time loss.

The present invention is aimed at solving the drawbacks of the prior art, and consists of an assembly section, and an assembly section that is arranged radially around the assembly section and that starts from the vicinity of the periphery of the assembly section as a fulcrum. In an apparatus consisting of a plurality of curved surface forming tables that are supported in a tiltable manner, a connecting iron plate is placed on the iron plate support surface of the curved surface forming table to form a curved surface in accordance with the curved surface, and then the curved surface forming table is raised to form this curved surface. A cylindrical structure is formed by arranging curved plates supported on a forming table in a cylindrical shape or in a part of a cylinder, and welding side edges of adjacent curved plates. This is a method for manufacturing a cylindrical structure.

Next, the present invention will be described in detail with reference to the drawings.

In FIG. 1, reference numeral 1 denotes an assembly section which is formed into an appropriate shape such as a table or flat shape, and around which a plurality of curved surface forming tables 2 are provided radially. The curved surface forming table 2 is supported around the assembly part 1 by a pivot part 3 so as to be able to be raised or lowered, and when it is laid down, it extends radially around the assembly part 1. In addition, in the upright state, the curved surface forming table 2 surrounds the assembly section 1 in a cylindrical shape as shown in FIG.

In order to obtain a cylindrical structure in this embodiment, first, a connecting iron plate is placed on the curved surface forming table 2 which is in an inverted state as shown in FIG. 1, and the curved surface plate 4 is formed and supported.

As shown in FIGS. 3 to 7, a large number of iron plate supporting members 5 having different heights are arranged on the iron plate supporting surface of the curved surface forming table 2 to form a desired curved surface. As shown in FIGS. 8 and 9, an iron plate support member 7 having a stopper 6 is disposed at the base end of the curved surface forming table 2.
This makes it possible to support the base end side of the curved plate 4.

To form a curved plate 4 by placing a continuous iron plate on the curved surface forming table 2, as shown in FIG. Set the connecting iron plates so that they are at the same height and place them horizontally.
Next, by moving the center support rod 8 downward, the curved plate 4 having the curved surface of the iron plate supporting surface is formed by deflection due to the weight of the connected iron plate, and form stabilization processing such as rib attachment is performed by a conventional method. In this embodiment, the work of connecting unit iron plates to form connected iron plates is also carried out on the curved surface forming table 2, but continuous iron plates prepared in advance by a conventional method may also be used.

Next, the curved plate 4 is lifted up by a crane or the like while being supported inside the curved surface forming table 2, as shown in FIG. 2, and the lower part of the curved plate 4 is placed on the assembly section 1. In this case, the curved surface forming table 2 is arranged radially around the assembly section 1, and as shown in FIGS. 10 and 11, a ground-fixed bracket 9 and a curved surface Each curved surface forming table 2 can be easily raised by being supported so as to be up and down by a pivot joint 3 to which a bracket 10 on the proximal end side of the forming table 2 is pivotally connected, and lifted by a crane 12 via a crane 11. The curved surface plate 4 supported by the curved surface forming table 2 can be easily arranged in a cylindrical shape on the assembly section 1. As mentioned above, since the base end of the curved surface forming table 20 of the curved surface plate 4 is supported by the stopper 6, there is no risk of positional deviation when the curved surface forming table 2 is raised, and therefore, the curved surface plate 4 is not placed on the assembly section 1. Can be accurately aligned into a cylindrical shape.

Next, the side lines of the curved plates arranged in a cylindrical shape on the assembly section 1 are welded automatically or manually to each other to obtain a cylindrical structure, and after completing the finishing work by the usual method, the curved surface forming table Cancels the standing state.

According to the present invention, a curved surface forming table in an apparatus comprising an assembly section and a plurality of curved surface forming tables arranged radially around the assembly section and supported so as to be able to rise and fall using the vicinity of the peripheral edge of the assembly section as a fulcrum. A connecting iron plate is placed on the iron plate support surface to form a curved plate, and while the curved plate is supported, the curved surface forming table is pulled toward the assembly table, so that the curved plate can be easily and accurately aligned into a cylindrical shape. In addition, the side edges of the curved plates arranged in a cylindrical shape on the assembly section can be welded together using an upright curved surface forming table as support, making the work safe and easy. Since there is no need to hang and move the steel plates by car, there is no risk of the curved plates being shaken by wind. Furthermore, the work of connecting unit steel plates to form connected steel plates can be done on the curved surface forming table, which simplifies the manufacturing process. This has the effect of significantly streamlining the process.

[Brief explanation of drawings]

Figures 1 and 2 are explanatory diagrams showing the state in which a large-diameter cylindrical structure is manufactured by implementing the present invention, Figure 3 is an overall external view of the curved surface forming table, and Figure 4 is the curved surface forming table. Top view of 5th
6 and 6 are explanatory diagrams of the iron plate supporting surface and base end of the curved surface forming table, FIG. 7 is an explanatory diagram of the iron plate supporting member, FIGS. 8 and 9 are explanatory diagrams of the iron plate supporting member with a stopper, and FIG. 10
This figure and FIG. 11 are explanatory diagrams of the vicinity of the periphery of the assembly section. DESCRIPTION OF SYMBOLS 1... Assembly part, 2... Curved surface forming table, 3... Pivot part, 4... Curved surface plate. Figure 10 Figure 11

Claims (1)

[Claims] A steel plate connected to a steel plate support surface of a curved surface forming table in an apparatus comprising an assembly section and a plurality of curved surface forming tables arranged radially around the assembly section and supported so as to be upright and fallable using the vicinity of the periphery of the assembly section as a fulcrum. to form a curved surface in accordance with the curved surface, then raise the curved surface forming table, arrange the curved plates supported by this curved surface forming table in a cylindrical shape or a part of the cylinder, and form a curved surface according to the curved surface. A method for manufacturing a large-diameter cylindrical structure, characterized by forming a cylindrical structure by welding side line portions of adjacent curved plates.