JP5773857B2 - Steel plate block manufacturing method - Google Patents

Description

  The present invention relates to a method for manufacturing a steel plate block.

  In general, in the construction of a steel structure, the steel structure is manufactured at a factory, then transferred to the installation site, and installed at the installation site. However, large steel structures that cannot be loaded on vehicles running on public roads cannot be transported from the factory to the installation site, and are not manufactured at the factory but directly manufactured at the work yard at the installation site. The work yard at the installation site is of course outdoor, does not have a manufacturing facility like a factory, and is affected by the weather, so that it is difficult for the installer to manufacture the steel structure at the installation site.

Therefore, in the construction of a large steel structure, it is desired to improve the workability of manufacturing at the installation site.
As a method for improving the workability, a manufacturing method of a long steel plate and a groove processing apparatus have been proposed (for example, see Patent Document 1). According to this manufacturing method and groove processing apparatus, a plurality of rolled steel plates cut by shear can be joined together to efficiently manufacture a long steel plate.

JP 2011-73021 A

  However, since the long steel plate manufactured by the manufacturing method and the groove processing apparatus is flat, when manufacturing a steel structure including a curved long steel plate, bending of the long steel plate by a bending machine is not possible. It is necessary separately. Such bending requires not only increasing the number of man-hours at the installation site but also positioning of the long steel plate with respect to the bending machine in the fear of blowing wind. For this reason, it was a heavy burden on the installer at the installation site.

  Then, an object of this invention is to provide the manufacturing method of the steel plate block which can manufacture a high quality steel plate block with high workability | operativity.

In order to solve the above-mentioned problems, a method for manufacturing a steel plate block according to the first aspect of the present invention is a method for manufacturing a steel plate block that uses a curved surface plate to manufacture a steel plate block including a steel plate curved with a predetermined curvature. And
A positioning member is provided on the steel plate,
While lifting the steel plate so as to bend with a curvature larger than a predetermined curvature by its own weight, the steel plate is moved above the curved platen,
The curved surface plate has an upright positioning receiver capable of positioning a steel plate, and a column group in which a surface formed by a support surface capable of supporting the steel plate is curved with a predetermined curvature,
The steel plate is suspended to a height at which the positioning member can come into contact with the positioning receiver of the curved surface plate from the side,
By rotating the steel sheet around the vertical axis, the positioning member is brought into contact with the positioning receiver from the side,
By suspending the steel plate and allowing the positioning member to receive the positioning member, the steel plate is positioned relative to the curved surface plate,
By further hanging the steel plate, the steel plate is sequentially placed on the support plate group of the curved surface plate from the center side to the outside.

Moreover, the manufacturing method of the steel plate block of the present invention according to claim 2 includes a plurality of positioning members provided on the steel plate in the manufacturing method of the steel plate block of the invention according to claim 1,
The number of positioning receivers of the curved surface plate is the same as the number of the positioning members.

Furthermore, the manufacturing method of the steel plate block of the present invention according to claim 3 is the manufacturing method of the steel plate block according to claim 1 or 2, wherein the positioning receivers are arranged upright at intervals in the horizontal direction. It has two guide members having different heights, and a receiving portion that is formed at an interval between the two guide members and can receive a positioning member.
The guide member has an inner surface that can face the other guide member and can guide the positioning member, and an upper end surface that is inclined by lowering the inner surface side so that the positioning member can be called into the inner surface.
The positioning member can come into contact with the inner side surface of the higher guide member at a higher position than the lower guide member.

  According to the method for manufacturing the steel plate block, the positioning member and the positioning receiver facilitate positioning of the steel plate with respect to the curved surface plate, and the steel plate is bent with a predetermined curvature without performing bending work. Since the steel plates are sequentially placed on the support column group from the center side toward the outside, the risk of damaging the steel plate with the support column group is reduced, so that a high-quality steel plate block can be manufactured with high workability.

It is a perspective view explaining schematic structure of the steel plate block and steel plate cell concerning an embodiment of the invention. It is a perspective view explaining the procedure which forms the steel shell board (long-sized steel plate) with which the steel plate block is provided, and shows the operation | work which arranges a steel plate. It is a perspective view explaining the procedure which forms the same long steel plate, and shows the operation | work which welds a steel plate. It is a perspective view which shows the state which welded the vertical rib and the positioning member to the same long steel plate. It is a perspective view which shows the state which lifted the same large steel plate and moved it to the upper direction of the curved surface plate. It is a front view explaining the procedure which positions the same long steel plate with respect to a curved surface plate, and shows the state which suspended the long steel plate to the height which a positioning member can contact | abut to a positioning receptacle from a side. It is a front view explaining the procedure which positions the same long steel plate with respect to a curved surface plate, shows the state which turned the long steel plate and the positioning member contacted the positioning receptacle from the side. It is a front view explaining the procedure which positions the same long steel plate with respect to a curved surface plate, and shows the state which suspended the long steel plate and received the positioning member in the positioning receptacle. It is a front view which shows the state which attached the shape holder to the same long steel plate.

Below, the manufacturing method of the steel plate block which concerns on embodiment of this invention is demonstrated.
The steel plate block is combined with other steel plate blocks to form one steel plate cell. That is, the steel plate block is a constituent member of the steel plate cell, and the steel plate cell is constituted by a plurality (for example, five) of steel plate blocks. Therefore, the steel plate cell will be briefly described first, and then the steel plate block will be described.

  The said steel plate cell is a cylindrical steel structure, and is used for construction of a seawall. Specifically, a number of steel plate cells are sequentially driven into the seabed ground at regular intervals, and adjacent steel plate cells are connected by a pair of arc members (curved steel plate structures). A revetment is constructed by filling earth and sand between the arc members.

  In general, a steel plate cell has a diameter of about 20 to 30 m and a height of about 20 to 40 m. For this reason, as shown in FIG. 1, the steel plate cell C is not manufactured as a single piece, but is a steel plate block (bamboo cracked) in which a cylindrical shape is equally divided into a plurality (5 as an example in FIG. 1). 1), which is a shape like the above, is manufactured by combining the above-mentioned number divided vertically.

  Such a steel plate block 1 includes a steel shell plate 2 curved with a predetermined curvature κ, and a reinforcing member 3 provided on the inner peripheral surface 2I of the steel shell plate 2 in consideration of stress generated during manufacture and construction. And arc joints (not shown) provided on the outer peripheral surface of the steel shell plate 2 for connecting with other steel plate cells C by arc members, and the left and right sides of the inner peripheral surface 2I of the steel shell plate 2 And a joint block (not shown) for joining to another steel plate block 1. The reinforcing material 3 includes four or more vertical ribs 31 (six as an example in FIG. 1) parallel to the central axis A of curvature of the steel shell plate 2 and a plurality of vertical ribs 31 (an example in FIG. 1). 4) circumferential ribs 32 (also referred to as horizontal ribs, which are arc-shaped).

  Next, the manufacturing method of the steel plate block 1 which is the gist of the present invention will be described with reference to the drawings. The steel plate block 1 and the steel plate cell C are manufactured in a work yard near the installation site of the steel plate cell C.

  Since the steel shell plate 2 of the steel plate block 1 is larger than the standard steel plate, a plurality of standard steel plates (or cut standard products) are joined together. Specifically, as shown in FIG. 2 and FIG. 3, a rectangular standard product (or a standard product is cut) a plurality of steel plates 2P on a surface plate FS (seven as an example in FIG. 3) with a crawler crane. Place them side by side.

  Then, as shown in FIG. 3, adjacent steel plates 2P are joined together from above by submerged arc welding to form a rectangular steel shell plate (hereinafter referred to as a long steel plate 2). At this time, in the long steel plate 2, the surface corresponding to the inner peripheral surface 2I of the steel plate cell C is the upper surface, and the surface corresponding to the outer peripheral surface 2E of the steel plate cell C is the lower surface. The size of the long steel plate 2 is naturally the same as the height of the steel plate cell C in the vertical direction, and the same as the length obtained by dividing the circumferential length of the steel plate cell C by the number of the vertical divisions. . Hereinafter, in the long steel plate 2, sides corresponding to the upper and lower ends of the installed steel plate cell C are referred to as an upper side and a lower side (left front side and right back side in FIG. 3). Sides to be joined to the steel plate block 1 are referred to as right side and left side (right front side and left back side in FIG. 3).

  Thereafter, although not shown, the long steel plate 2 is lifted on the upper side or the lower side and suspended on the surface plate FS while being reversed. For this reason, in the long steel plate 2, the surface corresponding to the inner peripheral surface 2I of the steel plate cell C is the lower surface, and the surface corresponding to the outer peripheral surface 2E of the steel plate cell C is the upper surface. And the adjacent steel plate in the long steel plate 2 is spliced from the upper surface (equivalent to the outer peripheral surface 2E of the steel plate cell C) by submerged arc welding. Further, an arc joint is welded to the upper surface of the long steel plate 2. Next, the long steel plate 2 is lifted again at the upper side or the lower side, and is suspended on the surface plate FS while being turned upside down. For this reason, in the long steel plate 2 again, the surface corresponding to the inner peripheral surface 2I of the steel plate cell C is the upper surface, and the surface corresponding to the outer peripheral surface 2E of the steel plate cell C is the lower surface. Then, as shown in FIG. 4, on the upper surface of the long steel plate 2 (corresponding to the inner peripheral surface 2I of the steel plate cell C), the vertical ribs 31 are formed from one of the upper side and the lower side to the other (parallel to the left side and the right side). 4 or more (six as an example in FIG. 4) are welded at equal intervals, block joints (not shown) are welded along the left and right sides, respectively, and a chevron is formed at the midpoint of the upper side and the midpoint of the lower side, respectively. Steel is welded as the positioning member 4. The positioning member 4 is arranged such that the angle irons on the upper side are arranged with the back facing right (or left) on the center line (one-dot chain line in FIG. 4) that equally divides the long steel plate 2 left and right, and the lower side Are arranged with their backs facing left (or right). In addition, the suspension hole 31H is formed near the both ends of the vertical rib 31 so that the said long steel plate 2 can be lifted at four places near the upper side and four places near the lower side.

Such long steel plate 2, by lifting with the lifting beam L shown in FIG. 5, is curved with a large curvature kappa _t than the predetermined curvature kappa. Specifically, as shown in FIG. 5, four suspension holes 31 </ b> H near the upper side of the long steel plate 2 formed in the longitudinal rib 31 and the suspension hole LH on one end side of the lifting beam L are connected to four wires. The other four wire ropes W are connected by the rope W, and the four hanging holes 31H near the lower side of the long steel plate 2 formed in the vertical rib 31 and the hanging hole LH on the other end side of the lifting beam L are connected. Connect with. At this time, the distance between the four suspension holes 31H near the upper side of the long steel plate 2 and the suspension hole LH on one end side of the lifting beam L, and the four suspension holes 31H and the lifting beam L near the lower side of the long steel plate 2 The distance to the suspension hole LH on the other end of the steel plate is made slightly smaller than the radius of curvature of the steel plate cell C (which is the reciprocal of the predetermined curvature κ) to make it even. For this reason, when the long steel plate 2 is lifted by the lifting beam L, the long steel plate 2 is bent by its own weight with a curvature κ _t larger than the curvature of the steel plate cell C (predetermined curvature κ). After the long steel plate 2 is lifted in this way, the long steel plate 2 is moved above the curved surface plate 41.

Here, the said music surface plate 41 is demonstrated in detail.
As shown in FIGS. 5 to 8, the curved surface plate 41 is assembled in a substantially rectangular parallelepiped shape with a number of shape steels, and the placed long steel plate 2 is viewed from the upper side (and the lower side) as viewed from the front (and the rear side). The positioning of the long steel plate 2 with respect to the curved platen 41 is received by receiving a support group 42 that can be supported by being bent at a predetermined curvature κ by its own weight so that the view) becomes concave, and the positioning member 4 provided on the long steel plate 2. And a positioning receiver 44 to perform.

  The column group 42 includes a large number of columns 42P, and the height and arrangement of all columns 42P are designed so that the surface formed by the upper end surfaces (support surfaces) of these columns 42P is curved with the predetermined curvature κ. It has been done. Specifically, the column 42P that supports the left side and the right side of the long steel plate 2 is higher, and the column 42P that supports the side near the center line of the long steel plate 2 is lower.

  As shown in FIG. 5, the positioning receivers 44 are respectively arranged at positions where the corresponding positioning members 4 can be received (that is, two locations on the upper side and the lower side). Each positioning receiver 44 is made of two I-shaped steels having different heights (lengths). These two I-shaped steels are arranged upright at intervals in the left-right direction (that is, in the horizontal direction) so that the positioning member 4 can be received between them. In other words, the two I-shaped steels having different heights function as a guide member for guiding the positioning member 4, and the interval between the two I-shaped steels functions as a receiving portion 44 </ b> S that can receive the positioning member 4. . In addition, the said I-shaped steel guides the positioning member 4 in the inner surface which faces the other I-shaped steel, respectively. By the way, the two I-shaped steels have different heights (lengths) because the lower I-shaped steel on the inner surface of the higher I-shaped steel (hereinafter referred to as the long-height material 44H). The positioning member 4 moved in the horizontal direction at a position higher than (hereinafter referred to as short and low material 44L) is contacted, and thereafter the positioning member 4 is simply lowered along the long and high material 44H. This is because 4 is guided between the long and high material 44H and the short and low material 44L and is received by the receiving portion 44S. Further, the arrangement of the long and high members 44H and the short and low members 44L in the positioning receiver 44 is such that the back surface of the angle steel as the positioning member 4 is in contact with the long and high members 44H. That is, as shown in FIG. 5, when the positioning receiver 44 is on the upper side (left front side in FIG. 5), the back of the angle iron corresponding to the positioning member 4 is on the right side (right front side in FIG. 5). The long and high materials 44H are arranged on the right side, and the short and low materials 44L are arranged on the left side (the left back side in FIG. 5). Similarly, in the case of the positioning receiver 44 on the lower side (right rear side in FIG. 5), the rear surface of the angle steel corresponding to the corresponding positioning member 4 is on the left side (left rear side in FIG. 5). The material 44H is arranged, and the short material 44L is arranged on the right side (right front side in FIG. 5). Note that the upper end surfaces of the long and high members 44H and the short and low members 44L are inclined so that the inner surface side is lowered in order to make it easy to call the positioning member 4 on the inner surface.

Hereinafter, the process using the said music surface plate 41 is demonstrated.
As shown in FIG. 6, when the long steel plate 2 is suspended toward the curved surface plate 41 and the positioning member 4 has a height not less than the upper end surface of the short and low material 44L and not more than the upper end surface of the long and high material 44H. And stop hanging. Then, the long beam 2 is turned by rotating the lifting beam L about the vertical axis at the center thereof. The turning is performed little by little with the back surface of the angle iron as the positioning member 4 in the traveling direction. By this turning, the positioning member 4 moves horizontally with the back surface in the traveling direction, and as shown in FIG. 7, the back surface abuts at a position higher than the short material 44L on the inner surface of the long material 44H. When the back surface comes into contact with the long and high material 44H, the long steel plate 2 is suspended again, so that the positioning member 4 is received by the receiving portion 44S as shown in FIG. Positioning is performed. The long steel plate 2 is placed on the column group 42 by further hanging the long steel plate 2. Here, as described above, since the curvature κ _t of the suspended long steel plate 2 is larger than the predetermined curvature κ (see FIG. 7), the long steel plate 2 was lifted when placed on the column group 42. The curved shape changes from the curvature κ _t in the state to the predetermined curvature κ (see FIG. 8). For this reason, the long steel plate 2 is not placed on the column group 42 at the same time, but is placed sequentially from the center line side toward the left side and the right side. Therefore, the risk of damaging the long steel plate 2 by the support group 42 is reduced.

  Then, as shown in FIG. 9, the circumferential rib 32 is welded to the upper surface of the long steel plate 2 (corresponding to the inner peripheral surface 2I of the steel plate cell C) from one of the left side or the right side to the other. Further, in order to maintain the curved shape of the long steel plate 2, the shape holder 51 is attached to the upper surface of the long steel plate 2 via the connection piece 61. The shape holder 51 is a Warren truss structure that forms a large number of triangles from a group of horizontal members and diagonal members. The shape holder 51 is attached to the long steel plate 2 by welding the connection piece 61 to a corresponding position on the upper surface of the long steel plate 2 and joining the shape holder 51 to the connection piece 61 with a bolt and a nut. When the attachment of the shape holder 51 to the long steel plate 2 is completed, the steel plate block 1 is completed. In addition, the shape holder 51 is removed from the connection piece 61 after manufacturing the steel plate cell C, and is reused for manufacturing other steel plate blocks 1.

  The completed steel plate block 1 is raised and transported to a large assembly base that is a base for manufacturing the steel plate cell C. And if the five steel plate blocks 1 are arranged on a large assembly, these steel plate blocks 1 are combined into a cylindrical shape, and the adjacent steel plate blocks 1 are joined by block joint and welding, thereby completing the steel plate cell C.

  Thus, according to the manufacturing method of the steel plate block 1, the long steel plate 2 can be easily positioned with respect to the curved surface plate 41 by the positioning member 4 and the positioning receiver 44, and the long steel plate 2 has a predetermined curvature without being bent. Since it is curved at κ, workability can be improved.

Also, the long steel plate 2 by bending a large curvature kappa _t than the predetermined curvature kappa, since placing the long steel plate 2 to the strut group 42 having a support surface that is curved at a predetermined curvature Kyokujoban 41 kappa, long The steel plates 2 are sequentially placed from the center line side toward the left side and the right side, and the risk of the long steel plate 2 being damaged by the support column group 42 can be reduced.

Therefore, according to the manufacturing method of the said steel plate block 1, the high quality steel plate block 1 can be manufactured with high workability | operativity.
In the above embodiment, the positioning member 4 has been described as being provided on the center line of the long steel plate 2. However, the positioning member 4 is not limited to this and is arranged to be shifted left and right from the center line. May be.

  Moreover, although the said embodiment demonstrated the manufacturing method of the steel plate block 1, it is applied also about the manufacturing method of an arc member.

C Steel plate cell L Lifting beam W Wire rope κ Predetermined curvature 1 Steel plate block 2 Steel shell plate (long steel plate)
4 Positioning member 31 Vertical rib 41 Curved surface plate 42 Column group 42P Column 44 Positioning receiving body 44H Long and high material 44L Short and low material 44S Receiving part 51 Shape holder 61 Connection piece

Claims (3)

A steel plate block comprising a steel plate curved with a predetermined curvature is manufactured using a curved surface plate,
A positioning member is provided on the steel plate,
While lifting the steel plate so as to bend with a curvature larger than a predetermined curvature by its own weight, the steel plate is moved above the curved platen,
The curved surface plate has an upright positioning receiver capable of positioning a steel plate, and a column group in which a surface formed by a support surface capable of supporting the steel plate is curved with a predetermined curvature,
The steel plate is suspended to a height at which the positioning member can come into contact with the positioning receiver of the curved surface plate from the side,
By rotating the steel sheet around the vertical axis, the positioning member is brought into contact with the positioning receiver from the side,
By suspending the steel plate and allowing the positioning member to receive the positioning member, the steel plate is positioned relative to the curved surface plate,
A method of manufacturing a steel plate block, wherein the steel plate is further suspended, and the steel plate is sequentially placed on a support group of a curved surface plate from the center side toward the outside. There are multiple positioning members provided on the steel plate,
2. The method of manufacturing a steel plate block according to claim 1, wherein the number of positioning receivers of the curved surface plate is the same as the number of the positioning members. The positioning receiver has two guide members with different heights arranged upright and spaced apart from each other in a horizontal direction, and a receiving portion formed at an interval between the two guide members to receive the positioning member. Have
The guide member has an inner surface that can face the other guide member and can guide the positioning member, and an upper end surface that is inclined by lowering the inner surface side so that the positioning member can be called into the inner surface.
The method of manufacturing a steel plate block according to claim 1 or 2, wherein the positioning member can be brought into contact with the inner side surface of the higher guide member at a position higher than that of the lower guide member.

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