JPH0125842B2 - - Google Patents

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. By doing so, it is made into a cylindrical structure.

The method for manufacturing the curved plate is to first weld steel plates to produce a wide-area connecting steel plate having the area of the curved plate, then provide a vertical rib on one side of the connecting steel plate, and then attach the connecting steel plate to the support section. is placed on a curved surface forming table that forms a curved surface to form a curved surface plate, horizontal ribs are welded to the curved surface plate on this curved surface forming table, and vertical and horizontal ribs are provided in the inside of the curved surface plate so as to intersect with each other. There is. If necessary, a reinforcing member is provided behind 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 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 cylindrical structure, the curved plate is lifted up by a crane truck and moved and assembled.

The cylindrical structure used for the above purpose has, for example, a diameter of 15 m and a height of 20 m, and therefore the curved plate has a vertical side of 20 m and a horizontal side of 47 m, 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. It is difficult and dangerous to fix it in a designated place due to swaying, so it becomes impossible to work in the presence of wind. Furthermore, the positioning work when aligning the curved plates into a cylindrical shape by the above-mentioned operation is time-consuming, resulting in a large amount of danger 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, embodiments of the present invention will be described 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. This curved surface forming table 2 is supported around the assembly part 1 by a pivot part 3 so as to be able to rise and fall freely, and when it is laid down, it extends radially around the assembly part 1. Become. 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. Further, as shown in FIGS. 8 and 9, an iron plate support member 7 having a stopper 6 is arranged at the base end of the curved surface forming table 2, and the base end side of the curved surface plate 4 can be supported by this stopper 6. ing.

To form a curved plate 4 by placing a continuous iron plate on the curved surface forming table 2, as shown in FIG. By setting the connecting iron plates so that they are at the same height and placing them in a horizontal state, and then moving the central support rod 8 downward, the curved plate 4 having the curved surface of the iron plate supporting surface is caused by the deflection due to the weight of the connecting iron plates. is formed, and form stabilization processing is performed using conventional methods such as attaching ribs. 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 FIG. 10 and FIG. Since the table 2 is supported in a vertically movable manner by the pivot portion 3 which pivotally connects the bracket 10 on the proximal end side of the table 2, the tip of the curved surface forming table 2 can be lifted up with the crane 12 via the lifting fitting 11. Each curved surface forming table 2
can be easily raised, and the curved plates 4 supported by each 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 2 of the curved surface plate 4 is supported by the stopper 6, there is no risk of the positional shift occurring when the curved surface forming table 2 is raised, and therefore, the curved surface plate 4 is prevented from shifting when the curved surface forming table 2 is raised. It can be precisely aligned in a cylindrical shape.

Next, a cylindrical structure is obtained by automatically or manually welding the side edges of the curved plates arranged in a cylindrical shape on the assembly section 1, and after completing the finishing work by a conventional method, the curved surface forming table 2 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 product by car, there is no risk of the curved plate being shaken by wind force, and furthermore, the work of connecting unit steel plates to form connected steel plates can be done on the curved surface forming table, so manufacturing is possible. This has the effect of significantly streamlining the process.

[Brief explanation of drawings]

FIG. 1 and FIG. 2 are explanatory diagrams showing a state in which a large-diameter cylindrical structure is manufactured by implementing the present invention;
Fig. 3 is an overall external view of the curved surface forming table, Fig. 4 is a top view of the curved surface forming table, Figs. 5 and 6 are explanatory views of the iron plate support surface and base end of the curved surface forming table, and Fig. 7 is 8 and 9 are explanatory views of the iron plate support member with a stopper, and FIGS. 10 and 11 are explanatory views of the vicinity of the periphery of the assembly portion. 1... Assembly section, 2... Curved surface forming table, 3... Pivot joint section, 4... Curved surface plate.

Claims (1)

[Claims] 1. Connected to the iron plate support surface of the curved surface forming table in a device consisting of 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. A steel plate is placed to form a curved surface according to the curved surface, and then a curved surface forming table is erected, and the curved surfaces supported by this curved surface forming table are arranged in a cylindrical shape or a part of the cylinder, and the curved surface plates are A method for manufacturing a large-diameter cylindrical structure, comprising welding side edges of adjacent curved plates to form a cylindrical structure.