Steel structure construction method

Abstract

To provide a steel frame structure construction method, which is superior in workability.SOLUTION: A steel frame structure construction method in this invention comprises: a column-forming step in which a column 3 is formed with split parts of a column bottom part 4 and a column main part 5; a move-starting point side step in which a steel frame structure is movably constituted by arranging the column main part 5 in a move-starting point area S and installing beams (a beam 61 or the like) between these adjacent column main parts; a steel frame structure moving step in which a steel frame structure 2M movably constituted in the move-starting point side step is laterally moved from the move-starting point area S up to a move-ending point area E; and a move-ending point side step in which, in the move-ending point area E, a steel frame structure 2 is built being fixed on a column foundation in the move-ending point area E by fixing each column main part 5 of the steel frame structure that has been laterally moved to each column bottom part 4 that is fixed to a column foundation 10.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a construction method for a steel structure, and in particular to a construction method for moving a steel structure that is provided so as to be laterally movable laterally to a target position and setting it up. By law Regarding. [Background technology]

[0002] 2. Description of the Related Art There is known a construction method for a steel structure, called a traveling construction method, in which a column of the steel structure is moved laterally to construct the steel structure (see Patent Document 1, etc.). In Patent Document 1, a coupler nut is connected to a reinforcing bar via a lock nut and embedded in a column fixing part (column foundation). Then, the column of the unit of the steel frame structure, which is divided and assembled, is moved laterally on a flat bar (lateral movement path) to align the fixing hole formed in the base plate of the column with the screw hole of the coupler nut of the column fixing part, and then a threaded reinforcing bar is inserted from above into the fixing hole and fastened to the screw hole of the coupler nut, thereby fixing the column of the unit of the steel frame structure to the column fixing part. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 62-99516 Summary of the Invention [Problem to be solved by the invention]

[0004] According to the construction method for steel structures disclosed in Patent Document 1, the steel structure is moved laterally to the desired position, and then base plates provided at the lower ends of many columns of the steel structure are fixed with screw reinforcing bars (bolts). In the case of this structure, in order to securely fix the base plate to the column fixing part by tightening the threaded reinforcing bar (bolt), the diameter of the threaded reinforcing bar, the diameter of the fixing hole in the base plate of the column, and the diameter of the screw hole in the column fixing part must be formed to approximately the same dimensions, and after the steel structure is moved, the center position of each fixing hole in the base plate of each of the many columns of the steel structure must be accurately aligned with the center position of each screw hole corresponding to each fixing hole. However, in order to move a steel structure having many columns, it is extremely difficult to accurately align all of the fixing holes in each base plate provided at the lower ends of the numerous columns of the steel structure with the corresponding screw holes in each column fixing part, posing issues in terms of workability. If the center positions of the fixing holes and the screw holes cannot be accurately aligned, it becomes impossible to insert the threaded rebar (bolt) into the fixing holes and the screw holes. In such cases, it may be possible to carry out corrections such as reshaping the fixing holes in the base plate on the spot, but this may lead to deterioration of quality, and the labor involved in the corrections may increase construction costs or cause construction delays. In view of the above-mentioned problems, the present invention provides a method for constructing a steel structure by laterally moving columns of the steel structure, the method being excellent in workability. Law It is what we provide. [Means for solving the problem]

[0005] The steel structure construction method according to the present invention comprises a step of forming a column by dividing a column into a lower end portion fixed to the column foundation and a main portion connected to an upper end portion of the lower end portion, a step of forming a movable steel structure by providing the main portion at the start of movement and assembling a beam between adjacent main portions of the column, and a step of forming the movable steel structure at the start of movement. and a movement end point side step for constructing a steel structure fixed to the column foundation of the movement end point by fixing lower ends of each main column part of the steel structure that has been moved laterally to upper ends of each lower end part of each column fixed to the column foundation at the movement end point. In the steel structure moving step, the steel structure is moved laterally by moving the lower end faces of the main column parts of the steel structure laterally toward the movement end point, and in the movement end point side step, the lower ends of the main column parts of the steel structure and the upper ends of the lower ends of the columns fixed to the column foundation of the movement end point are fixed by welding. , move In the step on the moving start point side, a column foundation is constructed at the moving start point, a column lower end is attached to each constructed column foundation, a column main part is provided on each column lower end attached to each column foundation, and a beam is assembled between each adjacent column main part to configure a steel structure that can be moved. , move The movement start point side step includes a steel structure assembling step of assembling a steel structure in which a column main part is removably attached to a column lower end part attached to each column foundation of the movement start point part and a beam is assembled between each adjacent column main part removably attached, and a steel structure pre-movement preparation step of removing each column main part of the steel structure assembled in the steel structure assembling step from each column lower end part to constitute a laterally movable steel structure, and the steel structure moving step includes a lateral movement path configuring step of configuring a lateral movement path extending along the movement direction between adjacent column lower ends along the movement direction, and a moving step of moving the steel structure configured to be laterally movable laterally from the movement start point part to the movement end point part via the lateral movement path. , Pillar The lower end portion is provided with a base plate fixed to the column foundation at its lower end and a fixed surface at its upper end to which the lower end portion of the column main portion is fixed, and the column main portion is provided with a bottom plate at its lower end having a lower surface and a recessed portion recessed upward from the lower surface, and in the lateral movement path forming step, a movement path forming member extending along the movement direction is installed between the lower end portions of the columns adjacent along the movement direction, and a lateral movement path is formed in which the upper surface of the smooth surface forming member attached to the fixed surface of the lower end portion of the column and the upper surface of the smooth surface forming member attached to the upper end surface of the movement path forming member form a road surface at the same horizontal level, and in the movement step The method is characterized in that a friction-reducing material is placed in a recess in the bottom plate of a main column part of a steel structure configured to be laterally movable, the friction-reducing material is made to protrude below the underside of the bottom plate, the steel structure is moved laterally to the end point of movement while the friction-reducing material is in contact with the surface of the lateral movement path, and in the step on the side of the end point of movement, the main column part of the steel structure that has been moved laterally to the end point of movement is moved upward and the friction-reducing material is removed, and after that the smooth surface forming member attached to the fixed surface of the lower end of the column is removed, the main column part is moved downward, and then the outer peripheral edge of the underside of the main column part and the fixed surface of the lower end of the column are welded and fixed to each other. According to the steel structure construction method of the present invention, it is possible to provide a steel structure construction method with excellent workability. In addition, by constructing the column foundations at the start point of movement, the work of assembling the steel structure can be performed accurately at the start point of movement, and the work of constructing the steel structure that can be moved laterally can be performed safely. After the steel structure that can be moved laterally is moved to the end point of movement, the steel structure can be constructed at the start point of movement by using the lower ends of the columns fixed to the column foundations at the start point of movement. Also ,flat The friction reduction material comes into contact with the road surface of the lateral movement path, which is made smooth by the smooth surface forming member, and reduces the frictional resistance when the steel structure moves, making it easier to move the steel structure laterally. 。 MaIn addition, in the steel structure moving step, a lower end surface of a main part of a column of the steel structure is moved laterally on a lateral movement path provided along the moving direction of the steel structure. 。 Ma In addition, the recess has a side wall located on the rear side in the moving direction of the main column part and is open on the front side in the moving direction of the main column part, in the moving step, one end side of the friction reducing material is brought into contact with the side wall of the recess and the other end side of the friction reducing material is made to protrude from the recess through the opening of the recess, and in the moving end point side step, a metal plate is placed in the recess from which the friction reducing material has been removed, and at the opening side of the recess, the metal plate and the fixed surface of the lower end of the column are welded and joined, and the metal plate and the bottom plate of the main column are welded and joined. Therefore, after the steel frame structure is moved, when removing the friction reducing material from the recess in the moving end point side step, the part protruding outward from the recess can be held through the opening, and the friction reducing material can be easily removed from the recess. In addition, the entire circumference of the outer periphery of the lower surface of the main column part can be reliably welded to the fixed surface of the lower end of the column. Guide rails are provided at the construction site parallel to the lateral movement path, and support means are provided from a steel structure configured to be able to move laterally that is supported by the guide rails. This means that the steel structure is configured to be able to move laterally while being guided by the guide rails. This makes it possible to move the steel structure smoothly and accurately in a straight line with the main columns of the steel structure in the direction of movement, thereby enabling the steel structure to be moved laterally smoothly and accurately. The lower end side of the main part of the column is fixed onto the lower end of the column fixed to each column foundation at the starting point of movement, and a steel structure is constructed in which a beam is assembled between the main parts of each adjacent column at the starting point of movement, and the steel structure constructed at the starting point of movement and the steel structure constructed at the end point of movement are connected, so that the lower end of each column fixed to each column foundation at the starting point of movement can be effectively utilized. 。 [Brief description of the drawings]

[0006] [Figure 1] FIG. 1 is a perspective view showing an outline of a construction method for a steel structure (first embodiment). [Diagram 2] FIG. 1 is a plan view showing an outline of a construction method for a steel structure (first embodiment). [Diagram 3] FIG. 1 is a side view showing an outline of a construction method for a steel structure (first embodiment). [Figure 4] FIG. 1 is a side view showing a pillar formed separately into a lower pillar end portion and a main pillar portion (embodiment 1). [Diagram 5] Cross-sectional view of the lower end portion and main part of the column (embodiment 1). [Figure 6] FIG. 4 is a cross-sectional view showing the structure of the lower end portion of the main part of the pillar (embodiment 1). [Figure 7] A diagram showing the underside and recess of the bottom plate provided at the lower end of the main part of the column (embodiment 1). [Figure 8] FIG. 1 is a diagram showing an example of a construction procedure of a steel structure construction method (first embodiment). [Figure 9] FIG. 1 is a diagram showing an example of a construction procedure of a steel structure construction method (first embodiment). [Figure 10] FIG. 1 is a diagram showing an example of a construction procedure of a steel structure construction method (first embodiment). [Figure 11] FIG. 13 is a perspective view showing a state in which the main part of the pillar is moved by a power applying means (first embodiment). [Figure 12] FIG. 13 is a perspective view showing the state in which the main part of the pillar is moved up and down using a vertical movement means (first embodiment). [Figure 13] FIG. 11 is a plan view showing an outline of a construction method for a steel structure (third embodiment). [Figure 14] FIG. 11 is a side view showing an outline of a construction method for a steel structure (third embodiment). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0007] EMBODIMENT 1 The construction method for a steel structure according to embodiment 1, as shown in Figures 1 to 3, is a construction method for a steel structure in which a steel structure is configured to be laterally movable at a start point S of movement at a planned construction site 1 (see Figures 1(b), 2(a), and 3(a)), a steel structure 2M configured to be laterally movable is moved laterally to an end point E of movement at the planned construction site 1, and then fixed to column foundations 10, 10... at the end point E of movement, thereby constructing a steel structure 2 fixed to the column foundations 10, 10... (see Figures 1(c), 2(b), and 3(b)). 1 and 2, the position where a lateral movement path 7 described later is provided is indicated by a two-dot chain line, and the position where a guide rail 8 installed parallel to the lateral movement path 7 is provided is indicated by a one-dot chain line.

[0008] The steel structure construction method according to the first embodiment includes a movement range setting step, a column forming step, a movement start point side step, a steel structure moving step, and a movement end point side step. The movement range setting step is a step of setting a movement start point S and a movement end point E on the planned construction site 1, as shown in FIG. 1(a). In the column formation step, a column (steel column) 3 is formed by dividing it into a column lower end portion 4 and a column main portion 5, as shown in FIG. In other words, in the column formation step, the column 3 constituting the steel structure 2S assembled at the moving start point S, or the column 3 constituting the steel structure 2 constructed at the moving end point E, is formed by dividing it into the column lower end part 4 and the column main part 5. That is, in the steel frame structure construction method according to the first embodiment, a column 3 formed separately into a column lower end portion 4 and a column main portion 5 is used. That is, the construction method for a steel frame structure according to the first embodiment is realized by using a column 3 having a column lower end portion 4 and a column main portion 5 connected to the column lower end portion 4. The step on the movement starting point side is a step in which, at the movement starting point S, a column main part 5 is provided on top of each column lower end part 4 attached to each column foundation 10, and a reinforcing beam (steel reinforcing beam) 6 and a beam (steel beam) 61 are assembled between each adjacent column main part 5, 5 to form a steel structure 2S into a movable steel structure 2M (see Figures 1(b), 2(a), and 3(a)). The steel structure moving step is a step in which a steel structure 2M configured to be movable at the movement start point side step is moved laterally from the movement start point S to the movement end point E, as shown in FIG. 9(c). The step on the movement end point side is a step of constructing a steel structure 2 fixed to the column foundations 10, 10... at the movement end point E by fixing each of the column main parts 5, 5... of the steel structure 2M that has been moved laterally to each of the column lower ends 4, 4... fixed to the column foundations 10, 10... at the movement end point E, as shown in Figure 10(c) (see Figures 1(c), 2(b), and 3(b)).

[0009] In the construction method for the steel frame structure, after setting a start point S and an end point E on a planned construction site 1, first, independent column foundations 10, 10... are constructed on the ground G at the start point S and the end point E as shown in Fig. 8(a), and a reinforced concrete floor F of the ground floor is constructed between each adjacent column foundation 10, 10.... The reinforced concrete floor F is constructed, for example, as shown in Fig. 8(a), by backfilling the soil J and then pouring concrete on the soil J, or by pouring concrete into a slab formwork not shown. The start point S of the movement is the location where a temporary steel structure 2S is assembled on the column foundations 10, 10... provided at the start point S of the movement and configured into a movable steel structure 2M, and which serves as the starting point for moving this steel structure 2M to the end point E of the movement. In addition, the end point E of movement is the end point of movement of the steel structure 2M moved from the start point S, and is the location where the desired steel structure 2 is constructed by fixing the moved steel structure 2M to the column foundations 10, 10....

[0010] As shown in Figure 8(a), the column foundation 10 is composed of a column base base 20 provided in a foundation concrete pouring space formed by being surrounded by a formwork not shown in the figure, reinforcement not shown in the figure assembled in the foundation concrete pouring space, and foundation concrete 30 which is concrete poured in the foundation concrete pouring space and solidified. The column base base 20 is composed of a concrete section (waste concrete) 21 provided at the bottom of the foundation concrete pouring space, a set frame 23 fixed to the concrete section 21 with anchors 22, a plurality of anchor bolts 24, 24... attached to the set frame 23 and extending upward, and a gauge plate 25 fixed to the upper ends of the plurality of anchor bolts 24, 24... with nuts not shown. Then, concrete is poured into the foundation concrete pouring space to form the foundation concrete 30, and the upper ends of the multiple anchor bolts 24, 24... are configured to protrude above the upper end surface 30t of the foundation concrete 30 (see Figure 8(b) and Figure 4).

[0011] The column lower end 4 is a hollow, short, square column made of metal such as steel and having a U-shaped cross-section, and is equipped at its lower end with a base plate 41 fixed to the column foundation 10, and at its upper end with a fixing surface 42 to which the lower end of the column main part 5 is fixed. 5, the column lower end 4 is configured with a hollow short rectangular column 4B with upper and lower ends (both ends) open, which is formed by combining four flat steel plates 4A, 4A..., a base plate 41 made of a flat steel plate having a rectangular plate surface larger than the cross-sectional area of ​​the opening at the lower end of the rectangular column 4B and provided to close the opening at the lower end of the rectangular column 4B, and an upper end side plate 43 made of a flat steel plate having a rectangular plate surface larger than the cross-sectional area of ​​the opening at the upper end of the rectangular column 4B and provided to close the opening at the upper end of the rectangular column 4B. In this case, the fixing surface 42 of the column lower end 4 is formed by the plate surface that becomes the upper surface of the upper end side base plate 43. In addition, for example, the opening edge of the lower end of the rectangular pillar 4B is welded to the plate surface that becomes the upper surface of the base plate 41 so that the central axis of the rectangular pillar 4B coincides with the center of the rectangular plate surface of the base plate 41, and the opening edge of the upper end of the rectangular pillar 4B is welded to the plate surface that becomes the lower surface of the upper end plate 43 so that the central axis of the rectangular pillar 4B coincides with the center of the rectangular plate surface of the upper end plate 43, thereby forming the column lower end portion 4. Incidentally, for example, in advance at a factory or the like, erection pieces (erection pieces) 44 are attached by welding to each of the four side surfaces forming the circumferential surface near the upper end of the square column 4B of the column lower end portion 4.

[0012] The main column part 5 is a hollow rectangular column made of metal such as steel that is longer than the lower column end part 4 and has a U-shaped cross section. As shown in Figures 6 and 7, the lower end of the column is provided with a bottom plate 51 having a lower surface 52 and a recess 55 recessed upward from the lower surface 52. Like the lower column end portion 4, the column main portion 5 is configured, for example as shown in FIG. 5, by combining four flat steel plates 5A, 5A... to form a long, hollow rectangular column 5B with open upper and lower ends (both ends), and a bottom plate 51 made of a steel plate having a rectangular plate surface of a size corresponding to the cross-sectional area of ​​the opening at the lower end of the rectangular column 5B and arranged to cover the opening at the lower end of the rectangular column 5B. In addition, for example, the rectangular column 5B and the bottom plate 51 are joined by welding with the bottom plate 51 fitted into the inside of the opening at the lower end of the rectangular column 5B so that the central axis of the rectangular column 5B coincides with the center of the rectangular plate surface of the bottom plate 51, thereby forming the column main part 5. As shown in Fig. 4, a diaphragm 53 protruding from the peripheral surface of the lower end side of the square column 5B of the column main part 5 is provided, and a reinforcing beam 6 is joined to the diaphragm 53. The diaphragm 53 is preferably configured as a through diaphragm. That is, the column main portion 5 is a steel column having a configuration in which the above-mentioned bottom plate 51 is provided on the lower end side of a normal steel column. Incidentally, for example, in advance at a factory or the like, erection pieces (erection pieces) 54 are attached by welding to each of the four side surfaces forming the peripheral surface near the lower end of the rectangular column 5B of the column main part 5.

[0013] 6 and 7, the recess 55 formed on the plate surface that becomes the lower surface 52 of the bottom plate 51 has a rear wall 56B, a left wall 56L, and a right wall 56R located on the rear side (left side in FIG. 6) and both left and right sides (both sides in the direction perpendicular to the paper surface of FIG. 6, and top and bottom in FIG. 7) in the moving direction M of the column main part 5, and is also configured to have a front opening 57 that is open on the front side in the moving direction M of the column main part 5. The moving direction M of the column main part 5 refers to the moving direction of the column main part 5 when a steel structure 2M configured to be laterally movable is moved. In addition, at the boundary portion between the bottom surface 58 of the recess 55 and the rear side wall 56B, left side wall 56L, and right side wall 56R of the recess 55, a groove portion 59 is formed to avoid contact between a corner (hereinafter referred to as a "boundary corner") 93 which is the boundary between the rear side surface 91, left side surface, and top surface 92 of a friction reduction plate 9 as a friction reduction material described later, and a corner (hereinafter referred to as a "boundary corner") which is the boundary between the bottom surface 58 of the recess 55 and the rear side wall 56B, left side wall 56L, and right side wall 56R. For example, as shown in FIG. 7 , the bottom surface 58 of the recess 55 is provided with a narrow groove portion 59 that extends beyond and along the boundary line between the bottom surface 58 of the recess 55 and the rear wall 56B, left side wall 56L, and right side wall 56R of the recess 55, i.e., the narrow groove portion 59 that is recessed further upward than the bottom surface 58 along the periphery of the bottom surface 58 of the recess 55. In other words, in order to avoid contact between the peripheral boundary angle 93 of the upper surface 92 of the friction reduction plate 9 and the peripheral boundary angle of the bottom surface 58 of the recess 55, and to form a good surface contact state between the rear side surface 91 of the friction reduction plate 9 and the rear wall 56B of the recess 51, the groove portion 59 is provided in the recess 55.

[0014] In addition, the size of the lower surface 52 of the bottom plate 51 which forms the lower surface of the column main part 5 is configured to be smaller than the size of the fixing surface 42 which forms the upper surface of the column lower end part 4. In this way, by making the size of the underside 52 of the column main part 5 smaller than the size of the fixed surface 42 of the column lower end 4, when welding the outer periphery of the underside 52 of the column main part 5 to the fixed surface 42 of the column lower end 4 as described below, even if the underside 52 of the column main part 5 is not accurately positioned at a predetermined position on the fixed surface 42 of the column lower end 4, as long as the entire underside 52 of the column main part 5 is positioned on the fixed surface 42 of the column lower end 4, it is possible to weld and fix the outer periphery of the underside 52 of the column main part 5 to the fixed surface 42 of the column lower end 4, which makes it easier to position the underside 52 of the column main part 5 relative to the fixed surface 42 of the column lower end 4 when moving the column main part 5.

[0015] At the movement end point E, the lower end portions 4, 4 . . . are fixed in advance to the respective column bases 10, 10 . That is, at the end point E of the movement, after a base mortar 26 is laid on the foundation concrete 30 of the column foundation 10, after a predetermined time has elapsed, a construction device not shown is used to adjust the gap between the base plate 41 of the column lower end 4, which is temporarily fixed to the anchor bolts 24, 24..., and the foundation concrete 30 to correct the installation distortion of the column lower end 4 (adjusting the verticality of the column lower end 4), and then a nut 28 is fastened to the anchor bolt 24 via a washer 27 to perform the final tightening work of fixing the base plate 41 of the column lower end 4 to the anchor bolt 24 of the column foundation 10, thereby fixing the column lower end 4 to the column foundation 10. Any type of erection device may be used as long as it is capable of correcting the erection distortion of the lower end portion 4 of the pillar.

[0016] More specifically, the movement start point side step includes a steel structure assembly step and a steel structure movement preparation step.

[0017] In the steel structure assembly step, the column main parts 5, 5... are removably attached to the column lower ends 4, 4... attached to each column foundation 10, 10... at the moving starting point S, and a steel structure 2S is assembled in which reinforcing beams 6, 61 are assembled between each of the adjacent column main parts 5, 5 that are removably attached.

[0018] In the steel frame structure assembling step, first, the column lower end portions 4 are placed on the column foundations 10, 10 . . . formed at the movement starting point S. At the movement start point S, as shown in Fig. 8(a), after forming the foundation concrete 30 of the column foundation 10, as shown in Fig. 8(b), the gauge plate 25 of the column base 20 is removed, and the base mortar 26 is provided on the foundation concrete 30. Then, the upper end side of the anchor bolt 24 is inserted through the through hole 45 formed in the base plate 41 of the column lower end 4, and the base plate 41 of the column lower end 4 is installed on the foundation concrete 30 of the column foundation 10 via the base mortar 26 (see Fig. 4). That is, the base plate 41 of the column lower end 4 is temporarily fixed to the anchor bolt 24 of the column foundation 10 by temporarily fastening the nut 28 to the anchor bolt 24 via the washer 27. That is, at the starting point S of the movement, the lower end portions 4, 4... of the columns are temporarily fixed to each of the column foundations 10, 10..., and the main column portions 5, 5... are removably attached to the lower end portions 4, 4... of the columns temporarily fixed to each of the column foundations 10, 10.... After assembling the steel structure 2S, a nut 28 is fastened to the anchor bolt 24 via a washer 27, and the base plate 41 of the lower end portion 4 of the column is fixed to the anchor bolt 24 of the column foundation 10, thereby fixing the lower end portion 4 to the column foundation 10.

[0019] For the installation work of removably attaching the column main part 5 to the column lower end part 4, it is preferable to use an erection device 11 that is removably attached to the column lower end part 4 and the column main part 5 and that can perform erection adjustments such as adjusting the misalignment, level adjustment, and tilt adjustment between the column lower end part 4 and the column main part 5.

[0020] In addition, in the steel structure assembly step, construction work is carried out using a construction device 11 that is removably attached to the column lower end portion 4 and the column main portion 5 in order to removably attach the column lower end portion 4 and the column main portion 5, and the construction device not shown in the figure described above. In other words, it is preferable to use these construction devices 11 and the construction device not shown in the figure described above to assemble the steel structure 2S at the starting point S of the movement by assembling the reinforcing beams 6, 61 between the main parts 5, 5 of adjacent columns 3, 3 while performing the work of correcting the erection distortion (adjusting the verticality) of the column 3 composed of the lower end part 4 and the main part 5 of the column.

[0021] That is, as the above-mentioned construction device not shown in the figure, a construction device capable of correcting the insertion distortion (adjusting the perpendicularity) of the lower end portion 4 of the column or the column 3 relative to the column foundation 10 may be used. Furthermore, as the above-mentioned construction device 11, any construction device can be used that can perform construction adjustments such as adjusting the misalignment, level, and tilt between the column lower end portion 4 and the column main portion 5, i.e., that can perform construction adjustments of the column main portion 5 relative to the column lower end portion 4.

[0022] The construction work of the steel structure 2S at the movement starting point S is carried out in a state where, for example, each of the column main parts 5, 5 . . . for one section is removably attached to each of the column lower end parts 4, 4 . That is, a reinforcing beam 6 is assembled between the lower ends of adjacent column main parts 5, 5. Then, a beam 61 is assembled to the adjacent column main parts 5, 5 at a beam insertion position supporting the second floor, and a deck plate 62 is laid between the beams 61, 61. The second column is then connected, and a beam 61 is assembled to a beam insertion position supporting the third floor, and a deck plate 62 is laid between the beams 61, 61. A beam 61 is also assembled to a beam insertion position supporting the rooftop floor, and a deck plate 62 is laid between the beams 61, 61. Although FIG. 1 illustrates a steel structure 2S for constructing a three-story steel-framed building, the number of floors may be determined arbitrarily. In this way, the construction method for a steel structure according to the first embodiment is realized by using a steel structure including columns 3 each formed by connecting the column lower end portion 4 and the column main portion 5, and beams connected to adjacent columns 3 and columns 3. The steel structure may be configured to include at least the beam 61 described above as a beam.

[0023] The steel structure 2S constructed at the movement start point S and the laterally movable steel structure 2M constructed at the movement start point S in the steel structure pre-movement preparation step described below are at least configured to be self-supporting.

[0024] Furthermore, in the construction method for a steel structure of embodiment 1, a steel structure is made in which a reinforcing beam 6 is assembled between the lower ends of each adjacent column main part 5, 5, so that the steel structure itself can be reinforced and distortion, twisting, etc. of the steel structure can be suppressed when the steel structure is moved to the end point E of movement.

[0025] In the steel structure pre-movement preparation step, the main column parts 5, 5... of the steel structure 2S assembled at the movement starting point S in the steel structure assembly step are removed from the lower column ends 4, 4... to form a steel structure 2M that can be moved laterally. That is, after assembling a reinforced steel structure 2S at the starting point S of movement using the construction device 11, the construction device 11 is removed to remove each of the main column parts 5, 5... of the reinforced steel structure 2S from each of the lower column ends 4, 4... to form a reinforced steel structure 2M that can be moved laterally.

[0026] More specifically, the steel structure moving step includes a lateral movement path configuration step and a movement step. In the lateral movement path construction step, adjacent ones along the movement direction M Pillar bottom end 4,4 A lateral movement path 7 is formed between the two portions, extending along the movement direction. In the moving step, the steel structure 2M configured to be laterally movable is moved laterally from the movement start point S to the movement end point E via the lateral movement path 7.

[0027] Specifically, in the lateral movement path construction step, a movement path forming member extending along the movement direction M is installed between adjacent column lower ends 4, 4 along the movement direction M, and a lateral movement path 7 is constructed in which the upper surface of a smooth surface forming member 75 attached to the fixed surface 42 of the column lower end 4 fixed to the column foundation 10 and the upper surface of the smooth surface forming member 75 attached to the upper end surface of the movement path forming member form a road surface at the same horizontal level.

[0028] The movement path forming member is composed of, for example, a main rail material 70 installed between adjacent lower end portions 4, 4 of the pillars along the movement direction M, and a pillar edge rail material 71 installed at the pillar edge of the lower end portion 4 of the pillars. The main rail material 70 and the column edge rail material 71 are made of shaped steel such as an H-shaped steel, with one flange of the H-shaped steel fixed to the reinforced concrete floor F between the lower end portions 4, 4 of the columns, and the outer surface of the other flange of the H-shaped steel forming the upper end surface. The movement path forming member is provided so as to be continuous along the movement direction M. For example, the movement path forming member is provided so as to be continuous in a straight line along the movement direction M, or is provided so as to be continuous in a curved line along the movement direction M.

[0029] In addition, in the lateral movement path construction step, guide rails 8 are provided on the reinforced concrete floor F parallel to the lateral movement path 7, and support means are provided for the steel structure 2M, which is configured to be able to move laterally, to be supported by the guide rails 8, so that the steel structure is configured to be able to move laterally while being guided by the guide rails 8. Specifically, as shown in FIG. 11, the support means is composed of a support beam 65 extending from the reinforcing beam 6 toward the guide rail 8, and a guide roller 66 provided on the lower end side of the support beam 65. The guide rail 8 is formed by using shaped steel such as an H-shaped steel, and is fixed to the reinforced concrete floor F so that one flange of the H-shaped steel becomes a guide rail surface formed by a vertical plane. Therefore, by configuring the guide rollers 66 to roll on the guide rail surface, the steel structure 2M can be moved smoothly and accurately in a straight line in the moving direction M of the main column part 5 of the steel structure 2M, thereby enabling the lateral movement of the steel structure 2M to be performed smoothly and accurately.

[0030] Then, in the movement step, a friction reduction plate 9 serving as a friction reduction material is placed in the recess 55 of the bottom plate 51 of the column main part 5 of the steel structure 2M configured to be able to move laterally, and the friction reduction plate 9 is caused to protrude below the lower surface 52 of the bottom plate 51, and the steel structure 2M is moved laterally to the movement end point E while the friction reduction plate 9 is brought into contact with the road surface of the lateral movement path 7. In other words, when the steel structure 2M, which is configured to be able to move laterally, moves, the friction reduction plate 9 is brought into contact with the road surface of the lateral movement path 7, and the steel structure 2M is moved in a non-contact state where the underside 52 of the bottom plate 51 of the column main part 5 of the steel structure 2M is not in contact with the road surface of the lateral movement path 7. Therefore, by contact between the road surface of the lateral movement path 7, which is formed into a smooth surface by the smooth surface forming member 75, and the friction reduction plate 9, the frictional resistance during movement of the steel structure 2M can be reduced, making it possible to easily move the steel structure 2M laterally.

[0031] The friction reduction plate 9 may be a friction reduction plate made of a low-friction material such as monomer cast nylon (polyamide resin). The friction reduction plate 9 is made of a rectangular plate material. The length of the long side of the rectangular plate constituting the friction reduction plate 9 is longer than the length from the rear side wall 56B of the recess 55 to the front opening 57, the length of the short side of the rectangular plate is formed to a dimension corresponding to the distance between the left side wall 56L and the right side wall 56R of the recess 55, and the height (plate thickness) of the rectangular plate is formed to a length longer than the length from the bottom surface 58 of the recess 55 to the lower surface 52 of the bottom plate 51. In other words, the recess 55 is formed by removing a portion of the underside 52 of the bottom plate 51, and has a rear wall 56B positioned rearward in the moving direction M of the pillar main part 5 and in contact with the rear side surface 91 of the friction reduction plate 9, and is formed with a front opening 57 that is open on the front side in the moving direction M, and the depth dimension of the recess 55 from the underside 52 to the bottom surface 58 of the bottom plate 51 is formed to be smaller than the plate thickness dimension of the friction reduction plate 9 inserted between the bottom surface 58 of the recess 55 and the road surface of the lateral movement path 7.

[0032] Then, in the moving step, when the friction reduction plate 9 is installed in the recess 55 of the column main part 5, the rear side surface 91 at one end of the friction reduction plate 9 is brought into contact with the rear wall 56B of the recess 55, and the front side surface 99 at the other end of the friction reduction plate 9 is made to protrude from the recess 55 through the front opening 57. That is, the friction reduction plate 9 is installed in a state in which the rear end side surface 91 formed by one side surface between the short sides of the rectangular parallelepiped that forms the friction reduction plate 9 is brought into contact with the side wall 56B of the recess 55, and the front side surface side 99, which is the other side surface between the short sides of the rectangular parallelepiped, protrudes outward from the recess 55 through the front opening 57 of the recess 55. When the steel structure 2M is moved laterally in this state, the recess 55 has the above-mentioned groove portion 59, which ensures that the rear side surface 91 of the friction reduction plate 9 and the rear wall 56B of the recess 55 come into surface contact with each other, and the force applied to the bottom plate 51 can be reliably transmitted to the rear side surface 91 of the friction reduction plate 9 via the rear wall 56B of the recess 55, thereby allowing the steel structure 2M to be moved laterally more smoothly. That is, when the steel structure 2M moves, force is reliably transmitted from the rear wall 56 of the recess 55 of the column main part 5 to the rear side surface 91 of the friction reduction plate 9, and the steel structure 2M and the friction reduction plate 9 move together, thereby reducing friction during lateral movement of the steel structure 2M. Furthermore, after the steel structure 2M has moved, when removing the friction reduction plate 9 from the recess 55 at the step on the movement end point side, the front side surface 99 protruding outward from the recess 55 can be held via the front opening 57, making it possible to easily remove the friction reduction plate 9 from the recess 55.

[0033] As shown in FIG. 12, the work of installing the friction reduction plate 9 in the recess 55 and the work of easily removing the friction reduction plate 9 from the recess 55 are performed with the pillar main part 5 moved upward using an up-down movement jack 15 as a up-down movement means. In this case, by using the reinforcing beams 6, 6 as shown in Figure 12 as support parts when lifting the reinforced steel frame structure with the up-and-down jack 15, the steel frame structure can be easily lifted with the up-and-down jack 15 and the burden on the steel frame structure when lifting it with the up-and-down jack 15 can be reduced. In addition, in FIG. 12, reference numeral 16 denotes a height adjustment table for adjusting the installation height of the vertically movable jack 15.

[0034] In addition, in the movement step, the power for moving the steel structure 2M, which is configured to be laterally movable, laterally from the start point S to the end point E via the lateral movement path 7 can be, for example, the pressing force applied by a plurality of pressing jacks 13, 13... as power imparting means. As shown in FIG. 11, the piston side of the pressing jack 13 is connected to a mounting piece 12 attached to the lower end of the side surface on the rear side in the moving direction of the column main part 5, and a fixing device 14 provided on the cylinder side is fixed to the main rail material 70, etc., and then the piston is extended to apply a pressing force to the column main part 5 of the steel structure 2M. For example, a pressing jack 13 as a power-giving means is installed on the rear side of each of the multiple main column parts 5, 5... of a steel structure 2M that is configured to be able to move laterally, and by driving these pressing jacks 13, 13..., the steel structure 2M is moved to the end point E of movement.

[0035] In the step on the movement end point side, the column main part 5 of the steel structure 2M, which has been moved laterally to the movement end point E, is moved upward using the up-and-down jack 15, and the friction reduction plate 9 is removed from the recess 55 of the bottom plate 51 of the column main part 5. In addition, the smooth surface forming member 75 attached to the fixed surface 42 which becomes the upper surface of the column lower end 4 is removed. After that, a metal plate, for example a steel plate 51A (see Figures 10(b) and (c)), is placed in the recess 55 from which the friction reduction plate 9 has been removed, and the outer peripheral edge of the lower surface 52 of the column main part 5 is welded and joined to the fixed surface 42 which becomes the upper end surface of the column lower end 4. Furthermore, on the front opening 57 side of the recess 55, the steel plate 51A is welded and joined to the fixed surface 42 of the column lower end 4, and the steel plate 51A is welded and joined to the bottom plate 51 of the column main part 5, thereby constructing the steel structure 2 at the movement end point E. The steel plate 51A used has a plate thickness dimension that is the same as the depth dimension of the recess 55 from the lower surface 52 of the column main part 5 to the bottom surface 58 of the recess 55.

[0036] After the welding work is completed, the reinforcing beams 6 and supporting beams 65 are removed from the steel structure 2 (see FIG. 10(c)). The removed reinforcing beams 6 and supporting beams 65 can be reused in other parts of the steel structure 2, or when constructing a steel structure other than the steel structure 2, which is preferable because it allows for effective use of the reinforcing beams 6 and supporting beams 65, i.e., effective use of resources.

[0037] Then, a steel-framed building is constructed by constructing, for example, exterior walls, floor slabs, interior decoration, etc. on the steel structure 2 (see Figures 1(c), 2(b), and 3(b)) constructed at the end point E of the movement.

[0038] An example of a construction procedure according to the steel structure construction method of the first embodiment will be described below with reference to Figs. First, as shown in Fig. 8(a), at the start point S and end point E of the movement at the planned construction site 1, column foundations 10, 10... are constructed in accordance with the spacing (span) of the columns 3, 3 of the steel structure 2 to be constructed, and a reinforced concrete floor F is constructed between the column foundations 10, 10.... Note that, if the start point S of the movement and the end point E of the movement are separated from each other, it is sufficient to construct the column foundations 10, 10... and the reinforced concrete floor F between the start point S of the movement and the end point E of the movement as well. Next, as shown in Fig. 8(b), the lower end portions 4 of the columns are temporarily fixed to the respective column foundations 10, 10 of the movement starting point S. At this time, a smooth surface forming member 75 such as a stainless steel sheet is attached to the fixing surface 42 of the lower end portions 4 of the columns. 8(c), an erection device 11 is installed to removably attach the column main parts 5, 5... to the respective column lower ends 4, 4..., and an erection device (not shown) is installed on the column lower end 4 side to assemble the columns 3, and while correcting the erection distortion of the columns 3 (adjusting the verticality), the reinforcing beams 6 are installed between the lower ends of the column main parts 5, 5 of adjacent columns 3, 3. After the installation of the reinforcing beams 6 is completed, the beams 61 for the second floor are installed and the deck plates 62 for the second floor are laid. Then, the beams 61 for the desired number of floors are installed and the deck plates 62 are laid, and the desired steel structure 2S is constructed at the movement start point S. Before constructing the steel frame structure 2S, a main rail material 70 is installed on the reinforced concrete floor F between the lower end portions 4, 4 of the columns adjacent to each other along the moving direction M, and a column-side rail material 71 is installed on the reinforced concrete floor F at the column-side of the lower end portion 4 of the column. In this case, as shown in Fig. 8(c) and Fig. 9(a), the main rail material 70 may be installed first and then the column-side rail material 71, or conversely, the column-side rail material 71 may be installed first and then the main rail material 70. At this time, smooth surface forming members 75 such as stainless steel sheets are attached in advance to the upper end surfaces 74 of the main rail material 70 and the upper end surfaces 74 of the column-side rail material 71. That is, in order to reduce friction when the movable steel structure 2M is moved later, smooth surface forming members 75 such as stainless steel sheets are attached to the fixed surfaces 42 of the column lower ends 4, and similarly, smooth surface forming members 75 such as stainless steel sheets are also attached to the upper end surfaces 74 of the main rail material 70 and the upper end surfaces 74 of the column-side rail material 71. Once the steel structure 2S has been constructed at the movement start point S, as shown in Fig. 9(a), the erection device 11 and an erection device not shown in the figure are removed to form a movable steel structure 2M at the movement start point S. Then, the vertically movable jack 15 is used to move the column main part 5 upward (slightly lift it up), and a friction reduction plate 9 is installed between the recess 55 in the bottom plate 51 of the column main part 5 and the smooth surface forming member 75 attached to the fixed surface 42 of the column lower end part 4, and then the vertically movable jack 15 is lowered to lower the column main part 5 (see Fig. 9(a)). Then, a mounting piece 12 (see Figure 9(a)) for mounting one end of a pressing jack 13 is attached to the side located rearward in the direction of movement M at the lower end side of the pillar main part 5, and the other end of the pressing jack 13 is fixed to the lateral movement path 7 via a fixing device 14 to absorb the reaction force, and one end of the pressing jack 13 is fixed to the mounting piece 12, as shown in Figure 9(b). For example, the mounting piece 12 is attached so as to be aligned next to the erection piece 54. 11, for example, on each side surface located in the front-rear direction of the movement direction M at the lower end side of the column main part 5, one erection piece 54 is provided near the boundary between the adjacent left and right side surfaces, and on each side surface located in the left-right direction of the movement direction M at the lower end side of the column main part 5, one erection piece 54 is provided at the center of each side surface. In this case, as shown in FIG. 11, for example, the mounting piece 12 is provided so as to be located in the center between the left and right on the side surface located on the rear side of the movement direction M at the lower end side of the column main part 5. Also, as shown in FIG. 11, for example, on each side surface of the column lower end 4 located in the front-to-rear direction of the movement direction M, one construction piece 44 is provided near the boundary between the adjacent left and right side surfaces, and on each side surface of the column lower end 4 located in the left-to-right direction of the movement direction M, one construction piece 44 is provided in the center of each side surface. 9(c), the pressing jack 13 is driven to extend the pressing jack 13 by one stroke, and the pressing jack 13 is rearranged each time the pressing jack 13 is pushed and moved in the moving direction M. In this manner, the pressing operation by the pressing jack 13 and the rearrangement of the pressing jack 13 are repeated, whereby the movable steel structure 2M is moved laterally to the moving end point E. After the steel structure 2M is moved laterally to the end point E as shown in Figure 10(a), the column edge rail material 71 is removed, and then the column main part 5 is moved upward (slightly lifted) using the up-and-down jack 15 to remove the friction reduction plate 9 from between the recess 55 in the bottom plate 51 of the column main part 5 and the fixed surface 42 of the column lower end 4, and the smooth surface forming member 75 attached to the fixed surface 42 of the column lower end 4 is removed, and then the up-and-down jack 15 is lowered to lower the column main part 5. Then, as shown in Figure 10(a), the construction device 11 is reattached to the column main part 5 and the column lower end part 4 of the steel structure 2M that has been moved laterally to the end point E of movement, and the work of correcting the construction distortion of the column lower end part 4 and the column main part 5 is performed. After the erection distortion correction work is performed, as shown in Fig. 10(b), the erection pieces 44, 54 are removed, and then the outer periphery of the underside 52 of the column main part 5 and the fixing surface 42 of the column lower end 4 are welded to fix the column main part 5 and the column lower end 4. In this case, as described above, a steel plate 51A is inserted between the recess 55 and the bottom surface 58 of the column main part 5 and the fixing surface 42 of the column lower end 4, for example, through the front opening 57 of the recess 55, and the steel plate 51A and the fixing surface 42 of the column lower end 4 are welded and joined on the front opening 57 side of the recess 55, and the steel plate 51A and the bottom plate 51 of the column main part 5 are welded and joined, so that the entire circumference of the outer periphery of the underside 52 of the column main part 5 can be reliably welded to the fixing surface 42 of the column lower end 4. After the welding work is completed, as shown in Figure 10(c), the reinforcing beams 6, support beams 65, and main rail material 70 are removed, thereby constructing the desired steel structure 2 with the columns 3 fixed to the column foundations 10, 10... at the end point E of the movement.

[0039] According to the construction method for a steel structure of embodiment 1, it is possible to eliminate the need for the work of aligning the fixing holes of each base plate provided at the lower ends of the numerous columns of the steel structure with the corresponding screw holes of each column fixing part, as in Patent Document 1, thereby making it possible to provide a construction method for a steel structure with excellent workability. In addition, since the column foundations 10 for attaching the column lower ends 4 are constructed at the movement starting point S, the construction work of assembling the steel structure 2S can be performed accurately at the movement starting point S, and the work of constructing the laterally movable steel structure 2M can be performed safely. Furthermore, after the laterally movable steel structure 2M is moved to the movement end point E, it becomes possible to construct a steel structure at the movement starting point S by using the column lower ends 4, 4... fixed to the column foundations 10, 10... at the movement starting point S, as in the second embodiment described later.

[0040] EMBODIMENT 2 A steel structure may be constructed in which the lower end side of the column main part 5 is fixed onto the column lower end part 4 fixed to each column foundation 10, 10... at the starting point S of movement, and reinforcing beams 61, 61 are assembled between the main column parts 5, 5 of each adjacent column 3 at the starting point S of movement, and the steel structure constructed at the starting point S of movement and the steel structure 2 constructed at the end point E of movement are connected. In other words, after the steel structure 2M has been moved to the end point E, the lower ends 4, 4... of the columns fixed to the column foundations 10, 10... remain at the starting point S of the movement, and these lower ends 4, 4... are not removed but are utilized to construct a steel structure at the starting point S of the movement, and the steel structure constructed at the starting point S of the movement is connected to the steel structure 2 constructed at the end point E of the movement, thereby making effective use of the lower ends 4, 4... of the columns fixed to the column foundations 10, 10... at the starting point S of the movement.

[0041] EMBODIMENT 3 As shown in Figs. 13 and 14, a steel structure 2 may be constructed by combining a plurality of divided steel structure units 2X, 2Y, and 2Z. In addition, in Figures 13 and 14, an example is shown in which a steel structure unit 2X constructed at the starting point S of movement is moved two spans from the starting point S of movement, a steel structure unit 2Y is constructed at the starting point S of movement, the steel structure unit 2X and the steel structure unit 2Y are connected, and then the connected steel structure unit 2X and steel structure unit 2Y are moved together to the end point E of movement, but the steel structure unit 2X and the steel structure unit 2Y constructed at the starting point S of movement may also be moved one by one to the end point E of movement. In addition, Figures 13 and 14 show an example in which a steel structure unit 2Z constructed at the start point S of the movement is combined with a steel structure unit 2Y constructed at the end point E of the movement, but it is also possible not to construct a steel structure unit 2Z at the start point S of the movement.

[0042] In each embodiment, in the lateral movement path forming step, a movement path forming member extending along the movement direction M is installed between the column lower ends 4, 4 adjacent to each other along the movement direction M, and the upper surface of the smooth surface forming member 75 attached to the fixed surface 42 of the column lower end 4 and the upper surface of the smooth surface forming member 75 attached to the upper end surface 74 of the movement path forming member are configured to be the same horizontal level road surface to form the lateral movement path 7, and in the movement step, a friction reduction plate 9 is installed in the recess 55 of the bottom plate 51 of the column main part 5 of the steel structure 2M configured to be able to move laterally, the friction reduction plate 9 is made to protrude below the lower surface 52 of the bottom plate 51, and the steel structure 2M is moved laterally to the movement end point E while the friction reduction plate 9 is in contact with the road surface of the lateral movement path 7. However, if the fixed surface 42 of the column lower end 4 itself and the upper end surface 74 of the movement path forming member itself are configured to function as a smooth road surface, there is no need to provide the above-mentioned smooth surface forming member 75. That is, in the lateral movement path construction step, a movement path forming member extending along the movement direction M is installed between adjacent column lower ends 4, 4 along the movement direction M, and a lateral movement path 7 may be constructed in which the fixed surface 42 of the column lower end 4 fixed to the column foundation 10 and the upper end surface 74 of the movement path forming member form a road surface at the same horizontal level.

[0043] In addition, in the step on the end point side of the movement, an example has been shown in which steel plate 51A is placed in recess 55 from which friction reduction plate 9 has been removed, and the steel plate 51A is welded to the fixed surface 42 of the column lower end portion 4 at the front opening 57 of recess 55, and the steel plate 51A is also welded to the bottom plate 51 of the column main portion 5, but it is also possible not to place steel plate 51A as a metal plate in recess 55.

[0044] In each embodiment, the recess 55 formed in the bottom plate 51 of the column main part 5 has a rear wall 56B located on the rear side of the moving direction M of the column main part 5, and is provided with a front opening 57 that is open on the front side of the moving direction M of the column main part 5, but the recess 55 formed in the bottom plate 51 of the column main part 5 may not be open on the front side of the moving direction M of the column main part 5. That is, the recess 55 may be a recess that is open only on the lower surface 52 of the bottom plate 51 and not on the peripheral surface of the bottom plate 51, or may be a recess that is provided with an opening that is open on the left side, right side, or left and right sides other than the front and rear sides in the moving direction M of the column main part 5.

[0045] Moreover, although an example has been given in which the pressing jack (pressing means) 13 is used as the power applying means, a towing jack (towing means) may also be used as the power applying means.

[0046] In addition, an example has been shown in which the outer peripheral edge of the lower surface 52 of the column main part 5 and the fixing surface 42 of the column lower end part 4 are fixed by welding, i.e., an example in which the lower end part of the column main part 52 of a steel frame structure and the upper end part of the column lower end part 4 are fixed by welding, but a fixing method other than welding may be used.

[0047] In addition, the above example shows moving a steel structure in which beams 6, 61 and a deck plate 62 are assembled between each of the main column parts 5, 5, but it is sufficient to move a steel structure in which at least beams 6, 61 are assembled between each of the main column parts 5, 5.

[0048] In addition, it is preferable that the above-mentioned erection distortion correction work is performed using the above-mentioned construction device, but the erection distortion correction work may also be performed using an anti-tip wire or the like.

[0049] In the above, an example is shown in which a square column is used as the column lower end portion 4 and the column main portion 5 that constitute the column (steel column) 3. However, the column lower end portion 4 and the column main portion 5 that constitute the column 3 may be columns other than a square column, such as a round column or a polygonal column.

[0050] In the above example, the column main parts 5, 5... are removably attached to the column lower ends 4, 4... temporarily fixed to each column foundation 10, 10... at the starting point S of movement, and then the steel structure 2S is assembled, and the column lower ends 4 are fixed to the column foundation 10. However, as with the end point E of movement, the column lower ends 4, 4... may be fixed to each column foundation 10, 10... formed at the starting point S of movement by final tightening, and then the steel structure 2S may be assembled in a state in which the column main parts 5, 5... are removably attached to the column lower ends 4, 4... fixed to each column foundation 10, 10...

[0051] In addition, in the above example, the column main part 5 is moved upward (slightly lifted) using the up-down jack 15 to install the friction reduction plate 9 between the recess 55 in the bottom plate 51 of the column main part 5 and the smooth surface forming member 75 attached to the fixed surface 42 of the column lower end part 4. However, the friction reduction plate 9 may be attached in advance to the bottom surface 55 of the recess 55 of the column main part 5 with adhesive tape or the like. In addition, when providing the column main part 5 on the column lower end part 4 at the starting point S of movement, the friction reduction plate 9 may be placed on the smooth surface forming member 75 attached to the fixed surface 42 of the column lower end part 4, and then the column main part 5 may be provided on the column lower end part 4, thereby installing the friction reduction plate 9 between the smooth surface forming member 75, which forms the upper surface of the column lower end part 4, and the recess 55 of the column main part 5.

[0052] In addition, in the above example, the path-forming member is divided into a main rail material 70 and a pillar-edge rail material 71 installed between the lower ends 4, 4 of the adjacent columns along the movement direction M, but the path-forming member may also be configured as a single rail material installed between the lower ends 4, 4 of the adjacent columns along the movement direction M.

[0053] In addition, in the above example, the construction piece 44 is attached in advance to the lower end 4 of the column, and the construction piece 54 is attached in advance to the lower end side of the main part 5 of the column, and the mounting piece 12 is attached to the lower end side of the main part 5 of the column when the pressing jack 13 is installed. However, the timing for attaching the construction pieces 44, 54 and the mounting piece 12 can be any time; the key is to attach the construction piece 44 to the lower end 4 of the column by the time it is needed, and the construction piece 54 and the mounting piece 12 to the lower end side of the main part 5 by the time it is needed.

[0054] In addition, in the above example, the mounting pieces 12 are attached next to the construction pieces 54, but for example, if one construction piece 44 is provided in advance at the center position of each side of the lower end portion 4 of the column, and one construction piece 54 is provided in advance at the center position of each side of the lower end side of the column main part 5, the construction pieces 54 can be removed and the mounting pieces 12 can be attached, or the construction pieces 54 can be used as they are as the mounting pieces for the pressing jack 13.

[0055] In the above example, column foundations 10, 10... are constructed at the start point S of movement, and the lower column ends 4, 4... are attached to each of the constructed column foundations 10, 10..., and main column parts 5, 5... are provided on top of the lower column ends 4, 4... attached to each of the column foundations 10, 10..., and a beam 61 is assembled between each of the adjacent main column parts 5, 5 to form a movable steel structure. However, it is also possible not to provide the column foundations 10, 10... and the lower column ends 4, 4... at the start point S of movement. For example, a rail material forming a path of movement may be installed at the starting point S of the movement, and column main parts 5, 5... may be provided on a smooth surface forming member 75 attached to the upper surface of the rail material, and a beam 61 may be assembled between each of the adjacent column main parts 5, 5 to form a steel structure that is movable. That is, the movement start point side step may be provided with the necessary configuration to enable each of the column main parts 5, 5... to stand on their own at the movement start point S, to construct a steel structure with beams 61 assembled between adjacent column main parts 5, 5..., and to enable the steel structure to be moved. In other words, the movement start point S may be provided with the necessary configurations such as platforms and road surfaces for installing and moving each of the column main parts 5, 5.... [Explanation of symbols]

[0056] 1 Construction site, 2, 2S, 2M steel structure, 3 pillar, 4 bottom end of pillar, 5 Main column, 6 Reinforcement beam, 7 Transverse movement path, 8 Guide rail, 9 Friction reduction plate (friction reduction material), 10 Column foundation, 42 Fixed surface, 51 Bottom plate, 51A steel plate (metal plate), 52 bottom surface, 55 recess, 57 front opening (opening), 61 Beam, 75 Smooth surface forming member, S Start point of movement, E End point of movement.

Claims

1. A method for constructing a steel structure, comprising: configuring a steel structure to be laterally movable at a start point of movement at a planned construction site; laterally moving the steel structure that is laterally movable to an end point of movement at the planned construction site; and fixing the steel structure to a column foundation at the end point of movement, A column forming step of forming a column by dividing it into a column lower end portion fixed to a column foundation and a column main portion connected to an upper end portion of the column lower end portion; A step on the side of the moving start point for constructing a movable steel structure in which a column main part is provided at the moving start point and a beam is assembled between each adjacent column main part; a steel structure moving step for laterally moving a steel structure configured to be movable at the movement start point side step from the movement start point to the movement end point; a movement end part side step for constructing a steel structure fixed to the column foundation at the movement end part by fixing lower ends of each main part of the column of the steel structure that has been moved laterally to upper ends of each lower end of the column fixed to the column foundation at the movement end part; Equipped with In the steel structure moving step, the lower end surface of the column main part of the steel structure is moved laterally toward the moving end point to move the steel structure laterally; At the step on the moving end side, the lower end of the main part of the column of the steel structure and the upper end of the lower end of the column fixed to the column foundation at the moving end part are welded and fixed to each other; In the step on the side of the moving start point, a column foundation is constructed in the moving start point, a column lower end portion is attached to each of the constructed column foundations, a column main portion is provided on each of the column lower ends attached to each of the column foundations, and a beam is assembled between each of the adjacent column main portions to form a movable steel structure; The step at the start of movement is a steel structure assembling step of removably attaching a column main part to the column lower end part attached to each column foundation of the movement start point portion and assembling a steel structure in which a beam is assembled between each of the removably attached adjacent column main parts; a steel structure pre-movement preparation step in which each main part of a column of the steel structure assembled in the steel structure assembly step is removed from a lower end of each column to configure a steel structure that can be moved laterally; Equipped with The steel structure moving steps are: A lateral movement path forming step for forming a lateral movement path extending along the movement direction between the lower end portions of the columns adjacent to each other along the movement direction; A moving step of moving a steel structure configured to be laterally movable from a start point of movement to an end point of movement via a lateral movement path; Equipped with The lower end of the column has a base plate at its lower end that is fixed to the column foundation, and a fixing surface at its upper end to which the lower end of the main column part is fixed; The column main portion is provided at its lower end with a bottom plate having a lower surface and a recessed portion recessed upward from the lower surface, In the lateral movement path forming step, a movement path forming member extending along the movement direction is installed between the lower ends of the pillars adjacent to each other along the movement direction, and a lateral movement path is formed in which the upper surface of the smooth surface forming member attached to the fixed surface of the lower end of the pillar and the upper surface of the smooth surface forming member attached to the upper end surface of the movement path forming member form a road surface at the same horizontal level; In the moving step, a friction reducing material is placed in a recess in a bottom plate of a main column part of a steel structure configured to be laterally movable, the friction reducing material is caused to protrude below the lower surface of the bottom plate, and the steel structure is moved laterally to a movement end point while the friction reducing material is brought into contact with a road surface of a lateral movement path; In the step on the side of the end point of movement, the main part of the column of the steel structure that has been moved laterally to the end point of movement is moved upward, and the friction reducing material is removed. Also, the smooth surface forming member attached to the fixed surface of the lower end of the column is removed. Then, the main part of the column is moved downward, and then the outer peripheral edge of the lower surface of the main part of the column and the fixed surface of the lower end of the column are welded and fixed. This is a construction method for a steel structure.

2. The steel structure construction method according to claim 1, characterized in that in the steel structure moving step, the lower end surface of the main part of the column of the steel structure is moved laterally on a lateral movement path provided along the movement direction of the steel structure.

3. the recess has a side wall located on the rear side in the moving direction of the column main portion, and is configured to be open on the front side in the moving direction of the column main portion, In the moving step, one end of the friction reducing material is brought into contact with a side wall of the recess and the other end of the friction reducing material is caused to protrude from the recess through an opening of the recess; The construction method for a steel structure as described in claim 1, characterized in that, in the step on the movement end point side, a metal plate is placed in the recess from which the friction-reducing material has been removed, and the metal plate is welded to the fixed surface of the lower end of the column at the opening side of the recess, and the metal plate is also welded to the bottom plate of the main part of the column.

4. A method for constructing a steel structure as described in any one of claims 1 to 3, characterized in that a guide rail is provided at the construction site parallel to the lateral movement path, and a support means is provided for the steel structure configured to be able to move laterally, which is supported by the guide rail, so that the steel structure is configured to be able to move laterally while being guided by the guide rail.

5. A method for constructing a steel structure as claimed in any one of claims 1 to 4, characterized in that a steel structure is constructed in which the lower end side of the main part of the column is fixed onto the lower end part of the column fixed to each column foundation at the starting point of movement, and a beam is assembled between the main parts of each adjacent column at the starting point of movement, and the steel structure constructed at the starting point of movement and the steel structure constructed at the end point of movement are connected.

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