Wireless construction method

Abstract

This invention provides a wireless construction method for steel frame structures that utilizes erection pieces and fixing jigs, enabling a reduction in construction time. [Solution] This wireless construction method involves assembling a steel frame building by temporarily fixing erection pieces 2 welded to a column 1 that is erected in advance and erection pieces 2 welded to a column 1 that is added to the column, using a fixing jig 4. The method is such that when the column 1 that is erected in advance and the column 1 that is added to the column 1 are viewed in the axial direction, the erection pieces 2 are positioned at the four corners of the column 1.

Description

Technical Field

[0001] The present invention relates to a wireless construction method for steel structures using erection pieces and fixing jigs. Background Art

[0002] Conventionally, in the construction of steel structures, a wireless construction method is known, in which an erection piece welded and attached to the column surface on the upper end side of a previously erected steel column, and an erection piece welded and attached to the column surface on the lower end side of a steel column to be added are connected by a fixing jig configured to be detachable from the erection pieces, a new steel column is temporarily fixed to the previously erected steel column, and then the process of welding and integrating the columns with each other is repeated. Prior Art Documents Patent Documents

[0003] Patent Document 1 Japanese Unexamined Patent Publication No. 11-303406 Summary of the Invention Problem to be Solved by the Invention

[0004] In such a wireless construction method, it is necessary to remove the fixing jig and erection pieces used for temporary fixing of columns after the columns are welded. However, since the erection pieces are fixedly secured to the columns by welding, removal from the columns requires time and effort, and post-treatment must be performed on the column surfaces after removal, which poses a problem for further shortening the construction period that would enhance the advantage of the wireless construction method. On the other hand, for example, it is conceivable to leave the erection pieces on the columns without removing them, but since the erection pieces protrude greatly from the column surfaces, a wall surface must be constructed to largely surround the columns while avoiding the erection pieces, which results in unnecessary occupation of space. Further, if an erection piece with a small protrusion amount from the column surface is employed, there is a risk that sufficient proof strength for temporary fixing cannot be obtained. Therefore, in view of the various problems mentioned above, the present invention aims to provide a wireless construction method for steel frame structures using erection pieces and fixing jigs that has sufficient load-bearing capacity and contributes to shortening the construction period. [Means for solving the problem]

[0005] As an embodiment of the wireless construction method to solve the above problems, a wireless construction method is used in which an erection piece welded to a rectangular column that is erected in advance and an erection piece welded to a rectangular column that is added to the said column are temporarily fixed with a fixing jig to assemble a steel frame building, wherein when the column that is erected in advance and the column that is added to the said column are viewed in the axial direction, the erection pieces are positioned at the four corners of the column. According to this embodiment, compared to the conventional method of attaching the erection piece to the column surface and leaving it attached, the amount of protrusion of the erection piece from the column surface is reduced. Therefore, even if construction continues with the erection piece attached to the column, the space occupied by the column in the building can be reduced. Thus, the process of removing the erection piece can be omitted, and the construction period can be shortened. Furthermore, as another embodiment of the wireless construction method, in addition to the erection pieces placed at the four corners, a second erection piece may be placed on the column surface between adjacent corners, such that the amount of overhang extending from the column surface falls within the range connecting the tips of the erection pieces provided at the adjacent corners. [Brief explanation of the drawing]

[0006] [Figure 1] This figure shows a column joint temporarily fixed by the wireless construction method according to this embodiment. [Figure 2] This figure shows an example of attaching an erection piece to a column. [Figure 3] This is a plan view showing the external support means that constitute the fixing jig. [Figure 4] This is a plan view showing the internal support means that constitute the fixing jig. [Figure 5] This is a cross-sectional view of the main part showing temporary fixing using a fixing jig. [Figure 6] This figure shows the difference in the occupied area between the method of installing the erection piece according to this embodiment and the conventional method of installing the erection piece. [Figure 7] This diagram shows other mounting configurations for the erection piece. [Modes for carrying out the invention]

[0007] The present invention will be described in detail below through embodiments of the invention. However, the following embodiments are not intended to limit the invention as defined in the claims, and not all combinations of features described in the embodiments are necessarily essential to the solution of the invention; rather, configurations that can be selectively adopted are included.

[0008] Figures 1(a) and 1(b) show the column joint section temporarily fixed by the wireless construction method according to this embodiment. As shown in the figures, the wireless construction method according to this embodiment is a method of temporarily fixing a new column 1 on top of a previously erected column 1 by fixing erection pieces 2;2 attached to a previously erected column (hereinafter referred to as an existing column) 1 and a column to be added to it (hereinafter referred to as a new column) 1 with a fixing jig 4. In this embodiment, the shape of the column 1 will be described using a square-shaped rectangular steel pipe.

[0009] Erection piece 2 is a plate-shaped member that extends along the axial direction of column 1 and is used for suspending column 1 and for temporary fixing of the existing column 1 and the newly installed column 1 by the fixing jig 4.

[0010] As shown in Figure 1(a), the erection piece 2 is attached to the upper end of the existing column 1 to be connected and to the lower end of the column 1 to be added. In other words, according to the wireless construction method of this embodiment, the erection piece 2 is attached to both the upper and lower ends of the column 1 to be added, except for the lowest column 1. The erection piece 2 attached to each column 1 is attached to the upper end in the axial direction of each column 1, or to a position at a predetermined distance in the axial direction from the lower end, according to the dimensions of the fixing jig 4.

[0011] Furthermore, as shown in Figure 1(b), the erection piece 2 is attached to the corner 1T of each column 1 around its circumference. The corner 1T of the column 1 refers to the portion where adjacent column faces 1a are connected. In this embodiment, since the corner 1T is rounded, the edges of each column face 1a when the column 1 is viewed in plan from the axial direction are extended, and the intersection point P of the diagonal tx of the rectangle, whose vertices are the points where the edges intersect, is defined as the corner 1T of the column 1 when it intersects with the surface of the column 1 (see Figure 2).

[0012] Figure 2 shows an example of attaching an erection piece to a column. The erection piece 2 is constructed, for example, by forming a flat steel plate into a predetermined shape, such as a rectangle, in a plan view. The erection piece 2 is provided with a suspension hole through which a wire or the like can be inserted when lifting the column 1. In the following description, the shape of the erection piece 2 will be described as rectangular.

[0013] As shown in Figure 2(b), the erection piece 2 extends along the extension direction (vertical direction) of the column 1, and the end face 2t on one of the longer sides is brought into contact with the column 1 and fixed by welding or the like, such that the longer side extends along the extension direction (vertical direction) of the column 1 and the plate surface 2a is perpendicular to the surface of the column 1. The erection piece 2 can be attached to the column 1, for example, when the column 1 is manufactured in a factory. Existing columns 1 and newly installed columns 1 with the erection piece 2 attached are temporarily fixed with fixing jigs 4. Fixing jigs 4 will be described below.

[0014] When adding a new column 1 to an existing column 1, the joint between the existing column 1 and the new column 1 is acted on by a moment formed by the horizontal force acting on the extended column 1 and the vertical force caused by the self-weight of the extended column 1 and beams connected to said column 1, which tends to cause inclination of the previously erected column 1. Due to this moment, tensile force and compressive force act on the fixing jig 4.

[0015] Figure 3 is a plan view showing outer supporting means constituting the fixing jig 4. Figure 4 is a plan view showing inner supporting means constituting the fixing jig. The fixing jig 4 is configured to include a tensile force supporting means 40 that supports tensile force and a compressive force supporting means 60 that supports compressive force.

[0016] The tensile force supporting means 40 includes an elongated annular ring 41 having a first slit 42 into which the erection piece 2 of the existing column 1 is inserted, and a second slit 43 into which the erection piece 2 of the new column 1 is inserted.

[0017] For example, the ring 41 is configured by forming the first slit 42 and the second slit 43 using a steel plate with a thickness of 50 mm to 80 mm. Although the first slit 42 and the second slit 43 may be provided separately, as shown in Figure 3(a), one slit may serve both purposes.

[0018] To compensate for the strength reduction caused by the first slit 42 and the second slit 43, two reinforcing plates 47 are welded to the ring 41 so as to cover a part of each of the slits 42 and 43.

[0019] The ring 41 is provided with a plurality of bolt holes for fixing the ring 41 to each erection piece 2 inserted into the respective slits 42 and 43. For example, one bolt hole 44 from the lower side and two bolt holes 45 from both sides are formed in the first slit 42, and a total of three bolts are attached to the slit 42 so as to be able to advance and retreat. Further, two bolt holes 46 from one side are formed in the second slit 43, and two bolts are attached to the slit 43 so as to be able to advance and retreat.

[0020] The tensile force supporting means 40 having the above configuration can be attached to the columns 1; 1, for example, as follows. First, a stopper 2S (see FIG. 1(a)) attached to an erection piece 2 of a newly installed column 1 is passed through a second slit 43 of a ring 41, so that the erection piece 2 is inserted and suspended. The column 1 to be added is lowered onto the upper end of the existing column 1 while the stopper 2S prevents falling, the ring 41 is moved like a pendulum, and the erection piece 2 of the existing column 1 is inserted into the first slit 42 and placed at a predetermined position.

[0021] After the ring 41 is placed at a predetermined position, the tensile force supporting means 40 is attached to the columns 1; 1 by screwing a bolt 48 into a bolt hole 46 associated with the second slit 43 to fix the ring 41 to the erection piece 2 of the newly installed column 1, further screwing a bolt 49 positioned below the first slit 42, and then screwing two bolts 50 on both sides to fix the ring 41 to the erection piece 2 of the existing column 1.

[0022] The compressive force supporting means 60 is a device that is disposed in a gap 52 between the erection piece 2 of the existing column 1 and the erection piece 2 of the newly installed column 1 within the first slit 42 of the ring 41, and supports the load applied from the newly installed column 1 together with the existing column 1.

[0023] FIG. 4 is a plan view of the compressive force supporting means 60. As shown in the figure, the compressive force supporting means 60 is configured to include a cam arm 61, a seat plate 71, a shim plate 81, and a screw member 91. The cam arm 61, the seat plate 71, and the shim plate 81 are disposed in the gap 52 between the erection piece 2 of the existing column 1 and the erection piece 2 of the newly installed column 1 in the order of the shim plate 81, the cam arm 61, and the seat plate 71 from the bottom.

[0024] In a plan view as shown in Figure 4, the cam arm 61 is formed in a "V" shape that is convex downwards as a whole, and between the shim plate 81 and the seat plate 71, one end can contact the seat plate 71, the other end can contact a bolt 91 extending from the seat plate 71, and the convex downward portion in between can contact the shim plate 81.

[0025] The shim plate 81 has a flat bottom surface 82 and an inclined surface 83 on the upper side that the cam arm 61 contacts, so that it can be placed on the upper end surface of the erection piece 2 of the existing column 1 and remain stable.

[0026] The cam arm 61 has a contact portion 64a that contacts the inclined plane 83, which is cylindrical in shape, and is capable of rolling on the inclined plane 83. The contact portion 62a that contacts the seat plate 71 at one end of the cam arm 61 is formed in a cylindrical shape. The contact portion 72a of the seat plate 71 that contacts this end of the cam arm 61 is formed in a concave shape to receive the cylindrical contact portion 62a of the cam arm 61. The other end of the cam arm 61 has a planar contact portion 63a at its upper part, which is in contact with a bolt 91 extending from the seat plate 71. The cam arm 61 has a contact portion 62a that contacts the seat plate 71 as a pivot point 64, another contact portion 62a that contacts the seat plate 71 as an operating portion 62, and a contact portion 63a that contacts the bolt 91 as an input portion 63.

[0027] The other end of the seat plate 71 is provided with a screw hole 73 that penetrates vertically, and by screwing a bolt 91 into this screw hole 73, the other end of the cam arm 61 is pressed from above downwards.

[0028] The compression force support means 60 is positioned between the erection pieces 2, 2 by, for example, placing the cam arm 61 and the seat plate 71 in the gap between the erection pieces 2, 2 within the slit 42 of the ring 41 of the tensile force support means 40 with the cam arm 61 and seat plate 71 stacked on top of each other, and then inserting the shim plate 81 under the cam arm 61. Subsequently, by screwing in the threaded member 91, the input portion 63 of the cam arm 61 is pushed downward, and the working portion 62 of the cam arm 61 rotates around the pivot point 64 and moves upward, pushing up the seat plate 71.

[0029] This applies a support load to the erection piece 2 of the newly installed column 1, allowing, for example, a tilted newly installed column 1 to be brought closer to vertical. By performing such adjustments for all the compressive force support means 60 of the fixing jigs 4 located at the corners of the column 1, the newly installed column 1 can be made vertical.

[0030] In this way, by using the erection pieces 2 installed on the existing column 1 and the new column 1, and the fixing jig 4, the new column 1 can be temporarily fixed to the existing column 1. In other words, the newly installed column 1 is supported by the strength of the erection pieces 2 of the column 1, the erection pieces 2 of the erected column 1, and the fixing jig 4 that connects them.

[0031] Figure 6 shows the difference in the occupied area between the installation method of the erection piece 2 according to this embodiment (Figure 6(a)) and the conventional installation method of the erection piece 2 (Figure 6(b)). Note that the dimensions of the column 1 and the erection piece 2 shown in Figure 6 are the same. As shown in Figure 6(a), by attaching the erection piece 2 to the corner 1T of the column 1, the overhang amount x1, where the erection piece 2 extends outward from the surface of the column 1, can be reduced from the overhang amount x2 when the erection piece 2 is attached to the column surface 1a as in the conventional method shown in Figure 6(b), thereby reducing the area of ​​the occupied space relative to the floor surface from occupied space E2 to occupied space E1. The overhang amount x1 is defined by the plane moved parallel to the tip 2s of the erection piece 2 attached to the corner 1T from the column surface 1a.

[0032] In other words, conventionally, since the erection piece 2 was attached to the column surface 1a, if the building was designed so that the erection piece 2 could be attached to the column 1 and the subsequent construction phases could proceed, a wall would have to be constructed to surround the column, resulting in wasted space in the building. Therefore, the erection piece 2 was removed after welding the newly erected column 1 to the previously erected column 1. However, by attaching the erection piece 2 to the corner 1T of the column 1, even if the erection piece 2 can be attached and the subsequent construction phases can proceed, the amount of overhang from the column surface 1a is reduced, allowing for more space in the building without wasting it. In this way, it becomes possible to proceed with the erection piece 2 attached to the column 1 and the subsequent construction phases can be shortened.

[0033] On the other hand, if only the amount of overhang is considered, it is possible to configure the erection piece 2 to be attached to the column surface 1a in the conventional way, so as to reduce the amount of overhang from the column surface 1a. However, when the column 1 is temporarily fixed with the fixing jig 4, the distance L between the fixing jigs 4;4 becomes narrower, and the bearing capacity to support the moments caused by horizontal and vertical forces also decreases. For this reason, when a newly installed column is temporarily fixed, there is a risk that the bearing capacity required against the moments caused by horizontal and vertical forces will not be obtained.

[0034] Therefore, as described in this embodiment, by attaching erection pieces 2 to each corner 1T, it is possible to suppress the overhang from the column 1 while supporting the moment due to horizontal force and the moment due to the weight of the column beam. Furthermore, since the corner 1T has higher strength than the column surface 1a, it can support a larger moment.

[0035] Figure 7 shows another example of mounting the erection piece 2. Furthermore, if the temporary fixing with the erection piece 2 attached to the corner 1T is insufficient in strength, the lack of strength may be compensated for by attaching an auxiliary erection piece 2 (second erection piece) to the column surface 1a, for example, as shown in Figure 7. In this case, as shown in Figure 6(a), the erection piece attached to the column surface 1a should be configured so as not to cross the dedicated line e, which is formed by drawing a straight line connecting the tips 2s of the erection pieces 2 attached to the four corners 1T.

[0036] Furthermore, the erection piece 2 is not limited to a rectangular shape as shown in Figures 1 and 2, and may be modified as appropriate. For example, the erection piece 2 may be trapezoidal in shape such that the length of the end face to be welded is longer than the end face on the opposite side. By changing the shape of the erection piece 2 from a rectangle to a trapezoidal shape with a longer welded portion, for example, using the same material, the strength when temporarily fixing the columns 1 together can be improved.

[0037] Furthermore, even with the same shape, the strength during temporary fixing can be changed by changing the material. For example, by changing from SS material equivalent to SS400 to SM material equivalent to SM490, the strength during temporary fixing can be improved even with the same shape.

[0038] Note that the dimensions, shape, and weld length of the erection piece 2 mentioned above are examples only and should be appropriately modified based on the strength that the fixing jig 4 can withstand and the strength required for temporary fixing of the columns 1;1. [Explanation of Symbols]

[0039] 1 Column, 1a Column face, 1T Corner section, 2 Erection pieces, 2s Tip 4 Fixing fixtures, 40 tensile force support means, 60 compressive force support means, e dedicated line.

Claims

1. This wireless construction method involves assembling a steel frame structure by temporarily fixing erection pieces, which are welded to rectangular columns that are erected in advance, and erection pieces, which are welded to rectangular columns that are added to those columns, using fixing jigs. A wireless construction method characterized by arranging the erection pieces at the four corners of a column when the column that is erected in advance and the column that is added to the column are viewed in the axial direction.

2. The wireless construction method according to claim 1, characterized in that, in addition to the erection pieces arranged at the four corners, a second erection piece is arranged such that the amount of overhang extending from the column surface falls within the range connecting the tips of the erection pieces provided at adjacent corners.

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