JPS5921270B2 - Assembly method for large welded structures - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an assembly method for assembling and welding steel plate blocks constituting side walls while sequentially mounting them on a tower when constructing large welded structures such as blast furnaces and storage tanks. The position regulating piece attached to the block has been improved so that reliable position regulation can be performed with a small number of pieces, and these pieces can be used for multiple purposes.

In constructing the above-mentioned buildings, steel plate blocks cut to design dimensions or further curved are assembled, and predetermined portions of the blocks are welded together.

When assembling, various pieces of iron are tack-welded to the side edges of the steel plate blocks, and they are aligned with the adjacent blocks, the grooves are maintained correctly, and these pieces are aligned with each other. It is often tack welded to the block to hold it in place, and then main welding is performed. These pieces include a restraining piece to maintain the correct vertical weld line between adjacent blocks and to control inclination, etc., and a matching piece to match each other's surfaces, or a piece loaded on the top of the block. Guide pieces and the like are used to stably hold the blocks to be used, and these are provided at required locations. Therefore, not only is it necessary to keep a large number of pieces in stock, but also the installation work requires a lot of time. Also, with the exception of some pieces, these piece welds were performed on-site, and the drawings showing the manufacturing process do not show which parts the pieces were attached to. From this point of view, when manufacturing and processing steel plate blocks at one factory, the pieces are welded in advance to a predetermined position, and even if the pieces are welded together at the second site, it is possible to avoid the trouble of welding the pieces to the block. It is desirable to omit it. That is, since the thickness of the piece and the steel plate block are considerably different, it is efficient to perform this welding using a special welding device specially installed in the factory. It can also be kept as a record.

Figure 1 is an explanatory side view showing the assembly of a blast furnace as a typical example, Figure 2 is an enlarged sketch of the main parts in Figure 1, Figure 3 is an explanatory sketch of Figure 2 with other blocks adjacent to it, 4
The figure is a partially enlarged plan view of FIG. 2, showing a conventional assembly method.

That is, in constructing the blast furnace 1, a large number of steel plate blocks 2 are used.
(generally 4 to 8 pieces) are used to form a peripheral wall, the blocks 2 are again stacked on top of the peripheral wall, and the vertical weld joint 3 and the horizontal weld joint 4 are welded and assembled. By the way, each of these steel plate blocks 2 weighs 10 to 100 tons, so it is difficult to position them when loading them into the tower.In a blast furnace, efficiency is improved if 2 to 4 plates can be loaded in the tower in one day. It is the better one. Therefore, the above-mentioned pieces have come to be used to facilitate such mounting and positioning, but the pieces conventionally used are
These are restraining pieces 5, 5 provided at the vertical welding part 3VC, skin matching pieces 6, 6 provided in the middle of the pieces, and guide pieces 7, 7 provided at the top edge, and these are factory-installed. The pre-welded force ζ guiding piece 1 may also be installed on site. And restraint piece 5 is
As shown in FIGS. 2 and 4, the U-shaped steel plate is formed with a recess 9 that straddles the vertical weld groove line, and the mounting side 5a
is welded to PROTSU 2VC at the factory. Although FIG. 2 shows the restraining bead 5 attached only to the outer peripheral side of the block 2, it may be attached to both sides as shown in FIG. 4.
Further, a welding attachment part 10 is formed on the side opposite to the attachment side 5a, and the attachment part 10 becomes a welding groove facing the outer circumferential surface of the block 2a newly mounted on the tower. Other piece for skin matching 6
In this case, the outer piece 6 is L-shaped and its short side is welded to the block 2, and the inner piece 6a is welded so as to protrude on the same surface as the inner surface, and these are generally factory welded to both sides of the block 2. will be established. Then, the tower-mounted block 2a manufactured and processed in the factory is transported to the construction site and lifted by a crane, etc. as shown in Fig. 1. Place them so that they match each other. When placing it, its lower edge is inserted between the guide pieces 7, 7a provided at the top edge of the existing block 2, and the pieces 7, 7a are inserted into the block as shown in FIG. 7K. 2a is provided in the insertion gap to support the insertion block 2a. Further, the side edges are inserted between the restraining piece 5 and skin matching pieces 6, 6a provided on the existing block 2 side, and after holding the groove 3, the skin matching pieces 6VC are respectively inserted as shown in FIG. Wedge piece 8
Insert ~ block 2a into the inner skin matching piece 6
a to perform skin alignment, and then the mounting portion 10 of the restraint piece 5 is VC welded 10a to the block 2a to complete positioning. Then, welding is performed by tack welding and then vertical welding by appropriate means. By the way, such a restraint piece 5 and a skin matching piece 6 protrude from the side edge of the block 2, and become a hindrance during transportation or the like.

In addition, the restraint piece 5 must be welded to the block 2a, and a gap as thick as the block is formed between the guide pieces 7 and 7a, so a slight deviation may make insertion difficult and may cause peeling or breakage. This often occurs and may require correction welding on site. Furthermore, among these pieces, the matching and guide pieces in particular obstruct the movement of the torch prior to vertical and horizontal welding, and therefore must be removed, which is time-consuming. Therefore, in the present invention,
Regarding the side edges of the block, the restraining piece can be used as a skin matching piece, and the positioning of the restraining piece can be done by welding the restraining pieces together on site, and the guide piece is wider than the block thickness. It is formed and positioned on one side to simplify the cutting operation prior to horizontal welding, and the remaining portion can be used as part of the block weld.

Hereinafter, the present invention will be explained in detail based on the embodiments shown in FIGS. 5, 6, and 8 and below. Without limitation, changing the shape of parts for the purposes mentioned above and below,
Alternatively, the same implementation is possible even if a part of the design is changed. That is, in the present invention, the restraint pieces 11 and 13 are welded at the same height position on the side edge of each block at the factory as shown in FIG. 5, and the restraint pieces 11 and 13 are formed of L-shaped steel plates. Then, one end side of the blocks 2, 2a and VC are welded 11a, 13a, respectively, and the other end sides 12, 14 are aligned with the end face of the block, respectively, and a groove is formed. When assembling, these restraining pieces 11 and 13 are brought together and the grooves 12 and 14 are welded together as shown in FIGS. Therefore, in the on-site welding of the restraint pieces, the pieces are welded together, so welding can be performed simply and reliably.
In addition, prior to welding, a wedge material as shown as 18 is inserted between the pieces and the blocks, and the blocks are brought into contact with each other by this, so that only by joining the restraining pieces 11 and 13, restraint and skin matching can be achieved. It can be used for both purposes, making the traditional skin matching piece completely unnecessary. On the other hand, the guide pieces 16 and 15 are
As shown in FIG. 8, a recess 16a is formed on the welding attachment surface side of the inner piece 16.

The height of the recess 16a is such that the top edge of the block is located within the recess 16a (FIG. 8), or slightly below the top edge as shown in FIG. On the other hand, the piece 15 facing the outer periphery is welded to the block in such a shape as to form a groove gap 15a that is open upward including the top edge, and these welds are performed at a factory. When using such a guide piece, after mounting the block on the top edge, a wedge piece as shown at 17 is pushed into the groove gap 15a of the outer piece 15, thereby allowing the block to be mounted on the top edge. Move and position the inner piece as shown by the arrow in Figure 10. In this way, the distance between the pieces is made wider than the thickness of the block, so there is no accident of breakage as described above. Furthermore, when performing horizontal welding after being positioned and temporarily attached, the upper sides of these pieces can be opened extremely easily by cutting out these pieces 15 and 16 from the fusing parts 15b and 16b, respectively, and continuous horizontal welding can be performed. By forming a groove, welding work can be made more efficient. Furthermore, the remaining part that has been fused may be left on the block as it is. Also these pieces 15, 16r
Regarding c, it is convenient if the outer peripheral piece 15 is formed higher than the inner side, so that when the column-mounted block is placed from the inside, it can be held in contact with it. It should be noted that these can be formed in the opposite manner if necessary. Incidentally, since electroslag welding means is used for vertical welding on the restraining piece side, these restraining pieces are used as brackets for holding the copper dowel.

According to the present invention, when assembling such a large welded structure, the restraining pieces and guiding pieces of the adjacent and mounted blocks are configured and assembled as described above, so that a matching piece is not required. , and since the installation is done by factory welding, it can be kept as a record.

In addition, positioning can be done on site simply by welding the restraint pieces, making it extremely efficient. Further, by using such a guide piece, there is no need for incidental work such as cleaning the scars of the cut portion and inspecting for cracks, and the construction can be completed in a short period of time.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing an example of blast furnace construction, Fig. 2 is an explanatory sketch that enlarges a part of Fig. 1, Fig. 3 is an explanatory sketch showing a new block in Fig. 2, and Fig. 4 is an explanatory sketch showing an example of the construction of a blast furnace. FIG. 2 is a plan view, FIG. 5 is a plan view showing a restraining piece used in the present invention, FIG. 6 is a plan view explaining the progress of FIG. 5, and FIG. 7 is a cutting line - arrow in FIG. 4. Directional sectional views, Figures 8 and 9 are
10 is a sectional view showing another configuration example of FIG. 8. 1... Blast furnace, 2... Steel plate block, 3
... Vertical welding section, 4... Horizontal welding section,
5...Restriction piece, 6...Skin matching piece, 7...Guiding piece, 8, 17, 18
...Wedge piece, 9...Concavity, 10...
・Mounting part, 11, 13...Restriction piece, 12,
14... Welding groove, 15, 16... Guide piece.

Claims (1)

[Claims] 1. An assembly method for a building in which a large number of steel plate Glocks are mounted and the periphery thereof is welded vertically and horizontally, and a piece used for positioning, skin alignment, and guidance is provided at the vertical and horizontal welding joints of the steel plate block. The pieces are installed in advance at specific positions on both the inner and outer sides of the steel plate, and the positioning and skin alignment pieces provided at the vertical weld joints straddle the vertical welds and are attached to the groove line of the welds. A welded part that is perpendicular to the groove line shall be formed at a position that matches the groove line, and the guide piece provided at the lateral weld joint shall consist of an inner piece and an outer piece,
A recess is formed near the groove line of the horizontal weld joint on the weld attachment side of either the outer or inner piece, and a recess is formed on the weld attachment side of the other outer or inner piece. A method for assembling a large-scale welded building, characterized in that a groove is formed above the welded part by a wedge material.