JP4188170B2 - Construction method and apparatus for steel structure - Google Patents

Description

  The present invention relates to a steel structure construction method and apparatus for constructing a steel structure by a horizontal slide method, and is effective when, for example, a station terminal building is constructed above an existing station platform. Applies to

  For example, in the extension construction of a station terminal building, etc., there is no trouble in the tracks, wires, etc. within the limited work hours of the midnight hours when there is no vehicle operation (after the last train operation and before the first power train operation) It is necessary to construct a steel frame, and in the past, special lifting machines (railway cranes, etc.) installed in the track are used.

  Moreover, there exist a traveling construction method and a slide construction method as a prior art relevant to this invention (for example, patent documents 1-7). Patent Document 1 is an intermediate-layer steel frame construction method, in which steel frames on both sides of a building are pre-assembled, and steel truss units are sequentially slid from one side to the other side by running rails on the steel frames on both sides. . Patent Document 2 is a method for laterally moving a roof frame, in which the roof frame is slid on a lower structure composed of independent columns.

  Patent Document 3 is a structure traveling method, in which a mega truss assembled on a workbench is sequentially pulled on a traveling rail. Patent Document 4 is a method for laying a beam member of a construction, in which a pair of long piers are opposed to each other across a planned construction site, and girders spanned on the pair of piers are sequentially moved on the piers. Patent Document 5 is an erection method for constructing an erected structure on a train track. A long core building is installed on both sides of the train track, and a large beam is connected between a pair of core buildings using a temporary train installed on the train track. And is moved in the direction of the train track.

Patent Document 6 is a horizontal material construction method for constructing a structure such as artificial ground on a road or the like. Column columns are arranged on both sides of a road or the like, and a girder in the direction of a girder between columns on each side. The horizontal members that are connected by beams and spanned between a pair of beam beams are sequentially slid on the beam beams and moved in the beam direction. Patent Document 7 is a steel truss / traveling method for a large space steel roof. A traveling rail is provided on a beam in the beam direction of a prefabricated frame, and one unit of the steel truss is sequentially slid on the traveling rail. The position is fixed.
JP 2002-235443 A Japanese Patent Laid-Open No. 9-72004 JP-A-8-28053 Japanese Patent Laid-Open No. 6-173659 Japanese Patent Laid-Open No. 5-295893 Japanese Patent Laid-Open No. 3-90703 JP 57-116847 A

  However, in the conventional construction method using the special hoist as described above, it takes time to carry in and out the track crane, etc., the construction period is prolonged, and the construction cost is increased. Moreover, it is a manned high-altitude work on the track and the upper part of the electric wire, which is dangerous work.

  Further, in the traveling method and the sliding method described in Patent Documents 1 and 3 to 7 described above, a traveling rail or the like for slidingly supporting the upper structure is disposed on the lower structure. It is necessary to bridge a continuous girder, etc., and it is necessary to make the lower structure strong against bending acting on the lower structure due to the expansion of the upper structure in the span direction. There are issues such as becoming.

  Moreover, in patent document 2, although the said problem can be solved by forming a lower structure from an independent pillar and a construction cost can be reduced, it is intended for a roof frame, It cannot be applied to the steel structure slide method.

  The present invention has been made to solve such problems, and its purpose is to shorten the construction period when constructing a steel structure such as a station terminal building on the upper part of an existing facility such as an existing station platform. An object of the present invention is to provide a steel structure construction method and its apparatus capable of reducing construction cost and improving safety.

According to the first aspect of the present invention, a main one-column pillar of a steel structure is erected at a construction location of the steel structure, and a one-node floor beam is provided on an upper portion of the main one-column pillar at one end of the construction location. Build the main end frame by spanning the main one-node floor beam (or floor slab, same below) located above the normal mounting position, or outside the one end side of the construction location , Construct a temporary end frame by laying the floor beam above the normal mounting position of the one-node floor beam over the temporary column,
On the end frame, join two or more columns on the other end of the steel structure and one and two or more floor beams so that the one-node floor beam is positioned above the normal mounting position. The process of assembling a block of an appropriate length, the process of sliding the assembled block to the other end of the construction location, and the process of assembling and connecting the next block to the slide block are sequentially repeated, and the other end from the end frame Slide the block that squeezed out to the side while supporting it with the one-node pillar on the other end of the construction point,
When the slide block reaches the predetermined installation position, the block is lifted down to join the two-node column of the block to the one-node column, and the first-floor beam of the block is lifted down to the normal mounting position to set the first node. It is a construction method of a steel structure characterized by joining to a column.

  This claim 1 is particularly effective when constructing a building or the like on an existing facility that is in service, for example, when constructing a station building on an existing station platform. is there. It can also be applied to the construction of ordinary buildings. Moreover, it applies to the steel structure of 2 stories or more.

  When applied to an existing station, a 1-column pillar of a steel structure is placed on a plurality of platforms and at least one place above the ground at a distance from the position of the outermost end of the platforms in the direction perpendicular to the track. A plurality of rows are arranged in the line direction at intervals (see FIGS. 1 and 2). Construct the main end frame by spanning the main one-node floor beam on top of the outermost one-node column on the non-platform side and at least one one-column on the platform side. To do. Not only the permanent end frame, but a temporary end frame may be constructed outside the construction site of the steel structure.

  In the present invention, the first section, the second section,... Mean the first floor portion, the second floor portion,. The one-column pole erected in advance has a length that protrudes upward from the normal mounting position of the one-node floor beam. Therefore, the block is assembled and slid at a position above the normal mounting position of the one-node floor beam. In the present invention, floor beams are used in the meaning including floor slabs.

  Assembling and sliding the blocks on the end frame, after the assembly of one block is completed, slide forward by one block, assemble the next block and connect to the preceding block in the vacant space. The process is repeated in a sequential manner. In the present invention, since the assembled block is a cantilever type that slides forward in a cantilevered manner, it is necessary to connect the next block and use it as a counterweight when the first one block slides. The length of one block is, for example, a length corresponding to the distance between pillars in the sliding direction, and this long block may be assembled and slid in a lump, or the long block may be divided into a plurality of parts in the sliding direction. The slide and assembly may be alternately repeated.

  In addition, the block is an upper structure (upper shed) on the second floor or higher above the 1st column, and on the side of the 2nd column so that the 1st floor beam is located above the normal mounting position. Temporarily fixed. After this 1-node floor beam is slid on the end gantry and the 1-node column, which are higher than the normal mounting position, the block is slightly lifted down and joined to the 2-node column and 1-node column. The fixed 1-node floor beam is lifted down to its normal mounting position.

  Claim 2 of the present invention is the construction method of the steel structure according to claim 1, wherein two or more columns and floor beams are assembled on the end frame of the main frame, and one end floor of the end frame is assembled. It is a construction method of a steel structure characterized by lifting a beam down to a regular mounting position and joining it to a one-node column of an end frame.

  The second aspect of the present invention is a case where a main 1-column and 1-node floor beam are used for an end frame used for assembling and sliding the block, and the 1-node floor beam is similar to the 1-node floor beam of the block. Lift down to the proper mounting position. After the construction of the building other than the end frame of the main building (lifting down the block and lifting down the one-node floor beam of the block) is completed, the assembly of two or more columns and floor beams of the end frame and the one-node floor beam When the block lift-down is completed, two or more columns and floor beams of the end frame are assembled, and the lift-down of the one-node floor beam of the block and the end frame 1 are assembled. You may make it perform the lift-down of a node floor beam.

  Claim 3 of the present invention is an apparatus used in the construction method of the steel structure according to claim 1 or 2, and is provided between the end frame and the block and slidably supports the block. A slide device that slides the slide member and the block; a slide support lifting device that is installed above the one-column pillar other than the end frame; It is a construction apparatus of a steel structure characterized by comprising a lift-down device that lifts down a one-node beam of a block.

  In this claim 3, the slide member of the end frame is a slide support such as a slide pad or a slide plate provided on at least one of the upper surface of the first floor beam of the end frame or the lower surface of the first floor beam of the block. Alternatively, a traveling rail on the end frame, a traveling wheel of a block, or the like can be used. As the slide device, a method using a jack and a link chain, a method using a center hole jack and a cable or a steel rod, a method using a winch and a wire rope, or the like can be used. As the slide support raising / lowering device at the top of the one-column post, a device for raising and lowering a slide support such as a slide pad with a jack can be used. As the lift-down device, a hoist such as a hoist or the above-described slide device can be used.

  The slide support lifting and lowering device lowers and retreats the slide support when the tip of the block that is pushed out in a cantilever type approaches, and lifts the slide support to pass the block when passing. In addition, since the lower part of the 2nd column protrudes from the lower surface of the 1st floor beam of the block, a pair of slide support devices are arranged in the sliding direction across the 1st column, and the protruding part at the lower part of the 2nd column is When approaching, the slide support on the end frame side is lowered and retracted, and when it reaches the first column, the slide support on the opposite side is retracted and retracted, and the blocks are alternately supported by sliding to dodge the protrusions.

  In the present invention, the entire floor of the upper structure may be constructed by the slide / lift-down method, or only the lower floor of the upper structure is constructed by the slide / lift-down method, and then the upper floor is constructed by the normal method. May be.

  According to the present invention as described above, it is possible to perform slide extrusion while assembling the upper structure for each block using the end frame located above the normal mounting position of the one-node floor beam and the main one-column. In order to install and lift the upper structure slightly at a predetermined position and install the 1st floor beam by lifting it down to the proper mounting position, the existing facilities such as the platform of the existing station are installed at the construction site. Even in some cases, the steel structure can be easily constructed.

  It is possible to minimize the use of cranes that take time to carry in and out of conventional construction methods, and because there is no need for traveling rails or girders, etc. in the conventional traveling method or slide method because it uses a single-column post. Thus, the steel structure can be constructed at a low cost in a short time. In addition, manned high-altitude work by cranes on tracks and electric wires is reduced, and safety is improved. Furthermore, since the reaction force and movement amount of the slide in the end frame can be centrally controlled and managed by a computer, the erection accuracy is improved.

  Since this invention consists of the above structures, there exist the following effects.

  (1) Using the end frame located above the normal mounting position of the 1-node floor beam and the main 1-node column, the upper structure is installed by slide extrusion while assembling each block, and at the specified position. Even if there is an existing facility such as a platform of an existing station at the construction site, the steel structure is used to lift the superstructure slightly and install the 1st floor beam to the proper mounting position. Can be easily constructed.

  (2) The use of cranes that take time to carry in and out of conventional construction methods can be reduced as much as possible, and the traveling rails and girders used in the conventional traveling construction method and slide construction method are used because of the use of the main one-column. The construction period is shortened and the construction cost is reduced.

  (3) Manned high-altitude work by cranes on railway tracks and electric wires will be reduced, and safety will be improved.

  (4) Since the slide reaction force and amount of movement in the end frame can be centrally controlled and managed by a computer, the installation accuracy is improved.

  Hereinafter, the present invention will be described based on the illustrated embodiments. This embodiment is an example applied to the extension work of a station terminal building. FIG. 1 is a side view showing an example of a steel structure of a station terminal building to which the present invention is applied. FIG. 2 is a plan view thereof. 3 to 5 show an example of a construction apparatus used in the present invention. FIGS. 6-8 shows one example of the construction method of this invention in order of a process.

1 and 2, the steel structure A to be constructed has a three-story structure, and is composed of a 1-node column a ₁ to a 3-node column a ₃ and a 1-node floor plate b _{1 to a} 3-node floor plate b _3. It is configured. The pillars a are erected on a plurality of platforms and on the two grounds spaced apart from the positions of the outermost ends of these platforms in the direction perpendicular to the line (in the illustrated example, a total of six points in the direction perpendicular to the line) In the line direction, there are a plurality of rows at intervals as shown in FIG. 2 (four rows in the illustrated example).

  As shown in FIG. 2, the floor slab b is a diamond-shaped floor beam set and is composed of floor beams c and d and a truss material e as shown in FIG. In FIG. 2, four rows of floor beams c are arranged in parallel to the track crossing direction (sliding direction), and six floor beams d are arranged in parallel to the track direction (sliding right angle direction). The column position is reinforced by a temporary diagonal material f.

  In addition, the following demonstrates the case where the upper structure (upper shed) of the 2nd floor part is slid and lifted down. In the present invention, after the lower floor of the upper structure is constructed by the slide / lift-down method, the upper floor of the upper structure may be constructed thereon by the normal construction method, or the upper structure of all the floors may be constructed by the slide / lift-down method. You may build at once by the construction method.

In such steel structure A, in the present invention, schematically, as shown in FIG. 3, a section columns a ₁ of the present set leave all erected, utilizing 1 Section columns a ₁ at one end build a steel assembly gantry (end Frame) 1, the superstructure a _U sequentially assembled on the steel assembly gantry 1, extruded forwardly in a slide device 2, as shown in FIG. 4, steel assembly gantry 1, the slide and slidably supported by the member 3, and the support in front of Section 1 columns a ₁ sliding bearing lifting device 4,, is lifted down the superstructure a _U reaches a predetermined position in the slide bearing the lifting device 4, furthermore, Fig. as shown in 5, is lifted down deck b ₁ of the bottom of the superstructure a _U lift-down device 5.

The steel frame assembly 1 is constructed in an area where there is no hindrance to train operation. In this embodiment, as shown in FIG. 3 (a), (4) to (6) at the rear (anti-sliding direction) end. The 1-node pillar a ₁ is used, and the 1-node floor slab b ₁ is installed over the 1-node pillar a ₁ . Each one-node column a ₁ has a length that protrudes upward from the normal mounting position L of the one-node floor slab b ₁ . Therefore, it is located above the mounting position L of Section 1 deck b ₁ also normal steel assembly gantry. Moreover, the length of the steel frame assembly gantry 1 is sufficiently longer than the distance between the front columns.

As shown in FIG. 3 (b), the slide device 2 is a drive device such as a hydraulic jack device 20, an electric jack or a winch, and is mounted on the one-node floor slab b _{1 at} the position of the one-column post a ₁ in (5). installed fixed to the tip portion of the traction Sakutai such that link chains 21 and PC cables and wire rope, of 1 Fushiyukahari c ₁ at the rear end portion of the upper structure a _U assembled as described below Removably connect to the bottom surface.

The hydraulic jack device 20 is a device (manufactured by Sakai Giken Co., Ltd.) that pulls the link chain 21 alternately by a pair of pins and pulls and moves the link chain 21 by stretching the hydraulic jack, or a PC cable using a center hole jack. the and the like device for traction movement to scale-up type, superstructure a _U by pulling the link chain 21 or the like in a hydraulic jack is moved forward and the like. The hydraulic jack 20, as shown in plan view in FIG. 3 (c), arranged in pairs one below Fushiyukahari c ₁ in each column of the superstructure A _U.

As shown in FIG. 4 (a), three slide members 3 on the steel assembly gantry 1 are provided between (4) and (5), and each row of single-node floor beams at the front end of the steel assembly gantry 1 is provided. place the lower attachment slide bearing 3a on the upper surface of c _1, upper attachment slide bearing 3b, and 3b disposed on the lower surface of the slide opposite end portions of 1 Fushiyukahari c ₁ in each column in the last section block of the superstructure a _U , so that the superstructure a _U can slidably supported at three points in the sliding direction.

  As shown in FIGS. 4 (b) and 4 (c), these slide supports 3a and 3b are made up of a slide pad 30 made of nylon or the like that can smoothly slide the beam flange surface, and an attachment member 31 that houses the pad. The mounting member 31 is fixed to the beam flange with bolts and nuts.

  The slide member is not limited to the above-described slide support, and may be a slide plate that slides on the beam flange surface, or a travel rail and a travel wheel.

The superstructure A _U that slides as described below in the slide device and the slide member as described above, as shown in FIG. 3 (a), (b) , an upper sheds of second floor, Part 1 Fushiyuka plate b ₁ are temporarily fixed to the side of Section 2 columns a ₂ so as to be positioned above the mounting position L of the normal, relatively small superstructure a _U is height, Section 1 of slab b ₁ It slides at a position above the normal mounting position L.

Slide bearing lifting device 4 of Section 1 columns a _1, as shown in FIG. 4 (a), are disposed (1) to (3) at the top of Section 1 columns a ₁ in each column between a pair in the sliding direction , to support the 1 Fushiyukahari c ₁ in each column of the superstructure a _U slidably. Further, as described later in detail, it is lifted down in order to bond the upper and lower pillars superstructure A _U has reached the predetermined position. In addition, as will be described later, an operation to raise and lower the slide support is performed.

  As shown in FIGS. 4 (d) and 4 (e), the slide support lifting / lowering device 4 is composed of a slide support 40 and a hydraulic jack 41. The slide support 40 has the same structure as the slide support 3a, and includes a slide pad 42 and an attachment member 43. The slide support 40 is attached to the tip of the rod of the hydraulic jack 41 via a height adjustment member 44 and can be moved up and down.

The hydraulic jack 41 is installed on a positioning bracket 45 projecting on both side surfaces of the one-node column a _{1 in} the sliding direction. As will be described later, the positioning bracket 45 is attached in advance to receive and position the one-node floor beam c ₁ lifted down to the normal attachment position L. Further, as shown in FIG. 4 (e), the pair of hydraulic jacks 41 in the sliding direction are connected by a PC steel rod 46 to be integrated.

In the sliding step, since the front end portion of the upper structure A _U which protrude forwardly cantilevered flexing slightly downward, which slide bearing 40 is lowered retracted in the avoidance purposes, the slide bearing the front end passes 40 Raise the to support the slide. Further, as shown in FIG. 4 (d), since the two sections pillar lower end of a ₂ of the upper structure A _U protrudes down, in order to dodge the lower end, the lower end approaching, rear The slide support 40 on the side is lowered and retracted, and is supported by the slide support 40 only on the front side. When the lower end is positioned between the pair of slide supports, the slide support 40 on the front side is moved down and retracted. 40 is raised to support the slide.

When superstructure A _U reaches a predetermined position, as shown in FIG. 4 (d), a state where two sections columns a ₂ is the position of the superstructure A _U on one section columns a _1, a pair in the sliding direction the slide bearing 40 is lowered to lift down the upper structure a _U, joining the upper end of section 1 columns a ₁ and a lower end of section 2 columns a ₂ by welding or bolts or the like.

As shown in FIG. 5, the lift-down device 5 lifts down the one-node floor slab b ₁ of the upper structure A _U in which the joining of the slide and the column has been completed to the proper mounting position L, and the upper structure A _U each row of hanging the lift-down device 5 from 2 Fushiyukahari c _2, is placed on the positioning bracket 45 lower hanging 1 Fushiyukahari c ₁ in each column, 1 both end portions of Fushiyukahari c ₁ of Are joined to the side surface of the 1-node column a ₁ by welding, bolts or the like.

  The lift-down device 5 can be a hoisting machine such as a hoist, or can be diverted from the hydraulic jack device 20 and the link chain 21 used in the slide device, or the center hole jack and the PC cable.

Further, the steel frame assembly gantry 1 also assembles the two-node pillar a ₂ and the two-node floor slab b ₂ , and then hangs the first-node floor slab b ₁ by the lift-down device 5 and hangs it over the proper mounting position L.

  Using the construction apparatus having the above-described configuration, the slide / lift-down method for the steel beam-structured floor slab is carried out in the following procedure (see FIGS. 6 to 8).

(1) As shown in FIG. 6 (i), erecting Section 1 columns a ₁ of all of the setting construction site. The steel frame assembly gantry 1 is constructed by laying the 1-node floor slab b ₁ over the 1-node column a ₁ of (4) to (6). Crane or the like assembled block of the tip portion of (1) side of the superstructure A _U on deck of the steel assembly gantry (6) side. If necessary, a temporary support 50 is provided between (5) and (6) to reinforce the one-node floor slab b ₁ .

(2) As shown in FIG. 6 (ii), the assembled tip block is slid forward by the length of the block by the slide device and the slide member, and the next one-node floor slab b ₁ is connected thereto. To do.

(3) In this embodiment, each 1-node floor slab b ₁ of 3 blocks between (1) to (4) is divided into 3 parts, and as shown in FIG. And the connection of the _1st floor slab b ₁ are repeated.

(4) As shown in FIG. 6 (iv), the two-node pillar a ₂ and the two-node floor slab b ₂ are joined, and the intermediate block following the tip block is assembled.

(5) As shown in FIG. 7 (i), by repeating the slide and assembly connections having the above blocks, superstructures A _U consisting tip blocks and two intermediate portions block from the top steel assembly gantry 1 Push forward in a cantilevered manner. Since this upper structure _AU is more than twice the interval between the columns, it does not fall down, but its tip part is slightly bent downward, so that the slide bearing 40 of the slide bearing lifting device 4 at the position (3) is Retreat down.

(6) As shown in FIG. 7 (ii), when the front end of the block is positioned on the column (3), the slide support 40 is raised and the block is supported by sliding. Lower protrusion of Section 2 columns a ₂ blocks, dodge in the manner described above.

(7) As shown in FIG. 7 (iii), when assembling / sliding the last block among the three intermediate blocks, the temporary beam 60 is sequentially added, and the temporary beam 60 is used for sliding. I do. Thereby, the upper structure _AU is constructed between (1) to (4).

(8) As shown in FIG. 7 (iv), all the blocks by a hydraulic jack 41 of the slide bearing the lifting device 4 is lifted down, the Section 2 columns a ₂ placed on the Section 1 columns a ₁ of each block, both The joints are joined by welding or bolts. The temporary beam 60 is removed before the lift-down.

(9) As shown in FIG. 8 (i), the 1-node floor slab b ₁ of all blocks is lifted down by the lift-down device 5 (for example, about 2 m), and both ends are placed on the positioning bracket 45 and 1-node joined by bolts or welding to the side surface of the column a _1.

(10) As shown in FIG. 8 (ii), (1) superstructures A _U between ~ (4) is completed.

(11) As shown in FIG. 8 (iii), the two-node column a ₂ and the two-node floor slab b ₂ are assembled on the steel frame assembly gantry 1, and the one-node floor slab b ₁ of the steel frame gantry ₁ is lifted down. 5 is lifted down, and both ends are joined to the side surface of the one-node column a ₁ by bolts or welding.

(12) As shown in FIG. 8 (iv), (1) ~ (6) superstructure A _U between to complete all.

When the step (8) in FIG. 7 (iv) is completed, the step of assembling the two-node column a ₂ and the two-node floor slab b ₂ on the steel frame assembly frame 1 shown in FIG. 8 (iii). previously performed, as described in FIG. 8 (i), a section slab b ₁ of all blocks following the step of lifting down, in some cases one section slab b ₁ steel assembly gantry 1 is lifted down.

  In the above description, the steel frame assembly gantry 1 is exemplified for the main installation. However, the present invention is not limited to this, and the temporary steel frame assembly gantry 1 can be constructed outside the steel frame structure to be constructed. Also, the assembly and sliding of the block are not limited to the method shown in the drawing, and other methods can be adopted. In addition, the construction work of the tar mill building at the existing station has been described. However, the construction is not limited to this, but can also be applied to the construction of a steel structure on an existing facility, etc. In addition, the construction of a normal steel structure It can also be applied to construction.

It is a side view which shows an example of the steel structure to which this invention is applied. It is a top view of FIG. It is an example of the construction apparatus used by this invention, (a) is a side view which shows the arrangement | positioning of the whole slide apparatus, (b) is a partial expanded side view of a slide apparatus, (c) is a plane of a slide apparatus FIG. It is an example of the building apparatus used by this invention, (a) is a side view which shows the whole arrangement | positioning of a slide apparatus and a slide support raising / lowering apparatus, (b) is the partial expanded side surface which shows the slide support of an end frame. (C) is a plan view thereof, (d) is a side view showing a slide support raising / lowering device having a one-node pillar, and (e) is a plan view thereof. It is an example of the construction apparatus used by this invention, and is a side view which shows arrangement | positioning of the whole lift-down apparatus. It is a side view which shows one example of the construction method of this invention in process order (1st step). It is a side view which shows one example of the construction method of this invention in process order (2nd step). It is a side view which shows one example of the construction method of this invention in process order (3rd step).

Explanation of symbols

A ... Steel structure A _U ... Superstructure (upper shed)
L ... Regular mounting position of 1-node floor slab a ... Pillar b ... Floor slab c ... Floor beam d ... Floor beam e ... Truss material f ... Temporary diagonal material 1 ... Steel frame (end frame)
2 ... Slide device 20 ... Hydraulic jack device 21 ... Link chain 3 ... Slide member 3a ... Lower mounting slide bearing 3b ... Upper mounting slide bearing 30 ... Slide pad 31 ... Mounting member 4 ... Slide bearing lifting device 40 ... Slide bearing 41 ... Hydraulic pressure Jack 42 ... Slide pad 43 ... Mounting member 44 ... Height adjusting member 45 ... Positioning bracket 46 ... PC steel bar 5 ... Lift-down device

Claims (3)

A one-node pillar of the steel structure is erected at the construction site of the steel structure, and above the regular one-column pillar at one end of the construction site, above the normal mounting position of the one-node floor beam Build the end frame of the main building by bridging the existing main one-floor beam, or the normal mounting position of the one-node floor beam on the outside of one end side of the building location above the temporary column Build a temporary end frame by crossing the floor beam located above
On the end frame, join two or more columns on the other end of the steel structure and one and two or more floor beams so that the one-node floor beam is positioned above the normal mounting position. The process of assembling a block of an appropriate length, the process of sliding the assembled block to the other end of the construction location, and the process of assembling and connecting the next block to the slide block are sequentially repeated, and the other end from the end frame Slide the block that squeezed out to the side while supporting it with the one-node pillar on the other end of the construction point,
When the slide block reaches the predetermined installation position, the block is lifted down to join the two-node column of the block to the one-node column, and the first-floor beam of the block is lifted down to the normal mounting position to set the first node. A construction method for steel structures characterized by joining to columns.   2. The steel structure construction method according to claim 1, wherein a column and a floor beam having two or more nodes are assembled on the end frame of the main construction, and the one-node floor beam of the end frame is lifted to a proper mounting position. A construction method of a steel structure characterized by being downed and joined to a one-node column of an end frame. A slide member for use in the steel structure construction method according to claim 1 or 2, wherein the slide member is provided between the end frame and the block and slidably supports the block. Installed on the upper part of the device and the one-node column other than the end frame, and is provided on the slide-supporting lifting device that supports the block slidably and ascending and descending, and on the two-node beam of the block. A steel structure construction device characterized by comprising a lift-down device.

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