JP2010121284A - Construction method of steel structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a construction method of a steel structure shortening a construction period and a working time, attaining labor saving and reduction of a construction cost by safely carrying out construction while saving time and labor without providing a large number of slide support lifting devices such as vertical jacks. <P>SOLUTION: The construction method in the case of constructing the steel structure 1 having a sky block 1b built over an existing facility 1a, at a predetermined story or higher comprises sequentially carrying out each step of (1) an independent column installation step, (2) a start working platform construction step, (3) a frame assembling step, (4) a frame moving step, (5) a frame extension step, (6) an extension-movement step, (7) a column joining step and (8) a beam repositioning step to carry out preceding construction using the partial block of the steel structure 1 as a start working platform 3 and to slide a moving frame 4 assembled on the start working platform 3, by a sliding means 6 while supporting the moving frame 4 to independent columns 2, thus constructing the steel structure 1. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a steel structure construction method, and is suitably applied to the case where an artificial ground of a steel structure such as a promenade of a station building is installed over an existing facility such as an existing platform.

  When steel structures are to be bridged over existing facilities such as train platforms or highways that are operating trains and cars, the steel structures are placed above the platforms and train tracks. In the case of construction, it is subject to various restrictions, such as giving priority to train operation and making dangerous construction work outside the train operation time. Especially in the vicinity of stations near the city, there are restrictions on the delivery route, and it is not unusual to work in three- or four-way blocked places or in narrow spaces. There is a problem that various restrictions are associated with the installation of lifting equipment and the loading and lifting of steel materials. In addition, once energization of the feeder from the substation is stopped, it takes about 30 minutes to start up, and the work must be completed outside the train operation time including the start-up time. I must. For this reason, there is only about 90 minutes in the suburbs of the city where the energization of this feeder can be stopped. Within this short working time, the wires can be replaced, cured, cranes, etc. There is also a problem that after carrying in and installing the lifting device, construction work must be carried out and the last changed wires and the like must be restored.

  Conventionally, a tower crane, a self-propelled hydraulic crane, or the like is used as a lifting device for the construction of a steel structure constructed over the existing facility. However, in order to install a tower crane, a route for carrying in and out the assembly members of the tower crane and a space for assembling (an assembling yard) are required around the installation location. In recent years, it has been very difficult to secure a route for loading and unloading the assembly yard and crane assembly parts necessary for installing tower cranes near stations in the suburbs of the city, and large tower cranes were installed in the first place. There is a problem that you can not. Therefore, the tower crane which covers the whole construction location of a steel structure cannot be installed, and the construction work itself of a steel structure becomes difficult. In addition, when using a tower crane, it is necessary to first design the foundation that will serve as the foundation, construct the foundation after the application and permission procedures, and then assemble the tower crane on it. There is also a problem that it takes time to start.

  In addition, even in self-propelled hydraulic cranes, assembly cranes such as crawler cranes need to secure a pay-in yard and a crane member carry-in path, as in the case of the tower crane, and a crane for both road and land use. However, although it is possible to install a crane between the tracks inside the railway station by moving the crane near the place where the steel structure is constructed from a place with a relatively large space outside the station, Even in such a case, there is a problem that a construction for relocating or rearranging an overhead wire such as a trolley wire within the swivel range of the boom has to be performed due to the hanging of the steel material. In order to change the overhead line, it is necessary to further mobilize the person in charge of electrical work and the watchman for each construction work to be performed outside the train operation time such as at night. In addition, in order to obtain the reaction force of the installation ground by extending the outrigger to the outside of the crane body at the crane installation site, it is necessary to carry out line lining and removal work over a wide range, even just short There is a problem that time and effort must be spent on constructions other than the construction work within the workable time. In addition, whether it is a tower crane or a self-propelled crane, it is difficult to perform construction work such as lifting and turning heavy steel structures at night when existing facilities are not used. At the same time, it is very dangerous and there is a demand to avoid as much as possible for safety.

  In order to solve such a problem, the applicants of the present invention established a main structure constructed on one end side of all the one-column pillars of the main section of the steel structure as a construction method and apparatus for an over-the-rail structure. A step of assembling an appropriate length block of the upper structure on the end frame, a step of sliding the assembled block to the other end side, and a step of assembling and connecting the next block to the slid block Repeatedly, slide the upper structure that protrudes from the end frame toward the other end while supporting it with a one-column on the other end. When the upper structure reaches a predetermined installation position, the upper structure is lifted down and the upper structure is lifted A construction method and apparatus for a steel structure in which a 2-node column of a structure is joined to a 1-column column, and a 1-node floor slab is lifted down to a regular mounting position and joined to the 1-node column (Patent Document 1). FIG. 3).

  However, in the steel structure construction method and apparatus described in Patent Document 1, a slide support elevating device has to be provided at the top of each one-column post, which increases installation costs. In addition, when supporting the protruding upper structure with a one-node column and lifting it down, it must be moved up and down by the respective slide support lifting devices of each column, and the level can be confirmed within a short workable time. There was a problem of having to spend time and personnel. Therefore, the maximum span length in which the upper structure can be slid while performing these operations within one stoppage of electricity is limited to about 20 m.

JP 2005-036485 A

  Therefore, the present invention solves the problems of the prior art, and can build a steel structure over an existing facility such as a station platform even in a narrow construction site where it is difficult to install a large lifting device. In addition, it is possible to save time and labor without installing a large number of slide support lifting devices such as vertical jacks, and to build safely, shortening construction time and work time, saving labor and reducing building cost. It aims at providing the construction method of the steel structure which can be planned.

  In order to solve the above-mentioned problem, the invention according to claim 1 is a construction method of a steel structure for constructing a steel structure having an upper block above a predetermined floor over an existing facility, In a predetermined area in the existing facility below the sky block, a plurality of columns from the first node of the steel structure to the node whose top exceeds the floor height of the predetermined floor are set up as independent columns at intervals. An independent pillar installation step, and outside the predetermined area, a part of the steel structure and / or a temporary steel structure is constructed up to a beam immediately below the predetermined floor, and concrete on the floor of the predetermined floor is placed. A starting gantry construction process for constructing a starting gantry, and a part of the sky block installed above the predetermined area on the starting gantry is assembled as a moving frame for a predetermined span from a position far from the starting gantry. In addition, a frame assembly step for attaching a plurality of beams immediately below the predetermined floor located below the assembled movable frame between a plurality of lower columns of the lowermost layer of the movable frame, and installing on the starting frame A frame moving process in which the moving frame is pushed substantially horizontally from the starting frame over the existing facility by a slide moving means and slid in a predetermined direction by a predetermined span, and the frame moving is performed on the starting frame. A part of the sky block is added for the moving span of the next frame moving step on the rear end side in the moving direction of the moving frame moved by the process, and immediately below the predetermined floor located below the additional span. Repeat the frame extension process, the frame extension process, and the frame movement process, as needed, to attach multiple beams between the lower columns of the lowest layer of the extension span. , An extension / movement step of constructing the upper block by moving to the final mounting position while adding the moving frame, and a plurality of pillars at the lowest layer of the upper block constructed in the addition / movement step. A column joining process for joining the upper part of the independent pillars, and a beam refilling process for rearranging the plurality of beams directly below the predetermined floor attached between the plurality of lower pillars at the bottom of the movable frame to a final mounting height; It is characterized by having.

  According to a second aspect of the present invention, in the first aspect, the top end of the independent column installed in the independent column installation step is provided with a sliding material having an inclined surface on the starting gantry side. A guide beam having an inclined surface is attached to the lowermost part on the front end side in the moving direction of the moving frame, and in the frame moving step, the moving frame is brought into sliding contact with the inclined surface of the sliding material and the inclined surface of the guide beam. The front end of the sliding frame is guided obliquely upward along the inclined surface of the sliding material, and the sliding weight of the moving frame body is slid while correcting the deflection of the moving frame body by supporting the own weight of the moving frame body on an independent column. Features.

  The invention according to claim 3 is the structure according to claim 1 or 2, wherein a deck plate or a composite floor board is installed on the beam of the moving frame in the frame assembly process and the frame extension process, The deck plate or the composite floor board is moved together with the moving frame, and the deck plate or the composite floor board is rearranged to the final mounting height together with the beam immediately below the predetermined floor in the beam replacement process.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, in the beam replacement process, all the beams immediately below the predetermined floor, or all the beams immediately below the predetermined floor, which are attached to the movable frame by the descending device. And deck plates or composite floor plates installed on these beams are simultaneously lowered to the final mounting height.

  According to a fifth aspect of the present invention, in the fourth aspect, the lowering device controls a plurality of hydraulic jacks supported by a beam on a predetermined floor, a cable that can be rolled down by the hydraulic jack, and the hydraulic pressure of the hydraulic jack. A plurality of pump units, and, in the beam replacement process, all the beams directly below a predetermined floor of the movable frame structure in which the plurality of pump units are centrally controlled by the control means and connected to the cable, or a predetermined number All the beams directly below the floor and deck plates or composite floor plates installed on those beams are lowered at the same time.

  A sixth aspect of the present invention is characterized in that, in any one of the second to fifth aspects, the inclined surface of the guide beam has a gradient of 1/50 or more and 1/10 or less.

  A seventh aspect of the invention is characterized in that, in any one of the second to sixth aspects, the sliding material is made of monomer cast nylon.

  According to an eighth aspect of the present invention, in any one of the second to seventh aspects, in the frame moving process, after the moving frame is slid by a predetermined span, the temporary moving jig is independent until the next frame moving process. The moving frame is temporarily fixed to the pillar of the pillar.

  The invention described in claim 9 is characterized in that, in claim 8, the temporary fixing jig comprises a bar and hydraulic clamps attached to both ends of the bar via universal joints.

  The invention according to claim 10 is characterized in that, in the independent column installation step, the independent column is erected after attaching one end of the temporary fixing jig to the beam joint bracket of the independent column in the independent column installation step. .

  The present invention is as described above, and according to the invention described in claim 1, in the construction method for constructing a steel structure having an upper block over a predetermined floor over an existing facility, The installation process, start frame construction process, frame assembly process, frame structure movement process, frame structure expansion process, expansion / movement process, column joining process, and beam replacement process are performed in sequence to The building block is constructed in advance as a starting gantry, and the steel frame structure is constructed by sliding the sliding frame using the slide moving means while supporting the moving frame assembled on the starting gantry on an independent column. Without installing equipment or installing a large number of slide support raising and lowering equipment, it is possible to build a steel structure that has an upper block above the existing facility over the predetermined floor. It can be reduced. In addition, reduction of construction man-hours such as lift-down process and work such as level confirmation will be omitted to improve work efficiency per hour and shorten construction period and work time (time required for construction). Can do.

  According to the invention described in claim 2, in claim 1, the top of the independent column installed in the independent column installation step is provided with a sliding material having an inclined surface on the starting gantry side, and in the frame assembly step, A guide beam having an inclined surface on the bottom surface is attached to the lowermost part on the front end side in the moving direction of the moving frame, and moved by sliding the inclined surface of the sliding material and the inclined surface of the guide beam in the frame moving process. The front end of the frame is guided obliquely upward along the inclined surface of the sliding material, and a part of the moving frame is supported by an independent column, and the movable frame is slid while being corrected upward. Therefore, in addition to the above effect, the frictional resistance is reduced by the mechanism of the guide beam and the sliding material, so that the moving frame can be smoothly slid. Further, since the load on the moving means can be reduced by the mechanism, the moving frame can be moved even with a small size, and the cost of the construction work can be further reduced.

  According to the invention described in claim 3, in claim 1 or 2, in the frame assembly process and the frame expansion process, a deck plate or a composite floor board is installed on the beam of the movable frame, and in the frame movement process The deck plate or the composite floor board is moved together with the moving frame, and the deck plate or the composite floor board is rearranged to the final mounting height together with the beam immediately below the predetermined floor in the beam replacement process. In addition to the above effects, deck plates and composite floorboards installed outside the range where heavy work can be performed can be efficiently installed on the beam using a lifting device within the possible range of lifting work and moved as they are. In addition, it is possible to reduce or omit the work of carrying in and installing the deck plate and the composite floor board, and further improve the work efficiency of the construction work. For this reason, the construction period can be shortened and the cost can be reduced.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, in the beam replacement process, all the beams immediately below the predetermined floor, or all of the beams immediately below the predetermined floor, which are attached to the movable frame by the lowering device. And the deck plate or composite floor plate installed on those beams are simultaneously lowered to the final mounting height, that is, the floors on the predetermined floor moved and attached to the moving frame are moved down at the same time to the final mounting position. In addition to the effects described above, it is possible to perform reordering work for each beam and each floorboard at the same time, thus dramatically improving work efficiency and reordering the beam immediately below the predetermined floor. In addition, the work time for carrying in and installing the deck plate and the composite floor board can be shortened. In addition, the slinging operation associated with repeated lifting and movement is reduced, and damage to the steel material of the beam, the deck plate, or the synthetic floor plate can be reduced.

  According to the fifth aspect of the present invention, in the fourth aspect, the lowering device includes a plurality of hydraulic jacks supported by the beam on the predetermined floor, a cable that can be rolled down by the hydraulic jack, and the hydraulic pressure of the hydraulic jack. A plurality of pump units for controlling the beam, and, in the beam replacement step, all the beams directly below a predetermined floor of the movable frame structure in which the plurality of pump units are centrally controlled by the control means and connected to the cable, or In addition to the above effects, all the beams directly below the predetermined floor and the deck plates or composite floor boards installed on those beams are simultaneously lowered, so that the predetermined floors can be lowered all at once and more accurately. The accuracy of the construction can be improved. For this reason, when descending, there is less risk of damaging the steel material of the beam by contacting other steel materials, and the quality can be improved.

  According to the sixth aspect of the present invention, in any of the second to fifth aspects, the inclined surface of the guide beam has a gradient of 1/50 or more and 1/10 or less. When correcting and correcting the bending of the front end of the sliding frame, the gradient of the inclined surface of the sliding material when considering the bending angle near the front end of the moving frame is within the optimum range, and furthermore, sliding is smoothly performed with reduced frictional resistance. Can be made.

  According to the invention of claim 7, in any one of claims 2 to 6, since the sliding material is made of monomer cast nylon, in addition to the above effect, the frictional sliding property with the steel material of the sliding material becomes good, The frictional resistance during the sliding movement of the moving frame can be further reduced. In addition, the mechanical strength and wear resistance are good and the durability is excellent. In addition, even if the sliding material is scraped off by the joint of the steel material that is in sliding contact with the sliding material, the frictional sliding property with the steel material is hardly deteriorated.

  According to an eighth aspect of the present invention, in any one of the second to seventh aspects, in the frame body moving step, the movable frame body is slid by a predetermined span and then temporarily fixed until the next frame body moving step. In addition to the above-mentioned effects, the construction structure is temporarily fixed to the pillar of the independent pillar, so that even if it is extremely rare such as a gust of wind or a big earthquake during the construction work, It is possible to prevent the moving frame of the steel structure on the way from deviating or deviating from a predetermined position, and safety can be improved.

  According to the ninth aspect of the present invention, in the eighth aspect, the temporary fixing jig includes a bar and hydraulic clamps attached to both ends of the bar via universal joints. In addition, it can be fixed temporarily at any position during the movement of the moving frame, causing not only a major earthquake but also a sudden accident such as a failure of the moving means or power failure at the work site. Even in this case, it can be safely temporarily fixed at an arbitrary position during the movement, and the safety is further improved. Moreover, since it is only a simple work of fastening with a hydraulic clamp, it is possible to improve work efficiency and shorten work time.

  According to the invention of claim 10, in the independent column installation process according to claim 8 or 9, the independent column is constructed after attaching one end of the temporary fixing jig to the beam joint bracket of the independent column. In addition to the effect, it is possible to omit the setting work of a separate lifting device such as a hoist and the lifting work of a temporary fixing jig performed after the frame body moving process is completed, and to perform it at a time when the independent pillar is constructed. For this reason, work man-hours can be reduced and work efficiency can be improved.

  An embodiment of the present invention will be described with reference to the drawings.

[Steel structure]
First, a steel structure to which a steel structure construction method according to an embodiment of the present invention is applied will be described with reference to FIGS. 1 and 2.
FIG. 1 is an elevation view showing a schematic configuration of a steel structure as an example of a steel structure having an upper block over a predetermined floor over an existing facility, and FIG. 2 is an outline of the steel structure of FIG. It is a top view which shows a structure. The steel structure 1 is a promenade spanned between station buildings composed of S-framed ramen structures built on an existing station platform. As shown in FIGS. A plane shape consisting of 1 to 8 spans and two spans between the beams (short direction) is A to C. The plane shape is a substantially arcuate polygon (A to C streets are arcuate, but the beams are arcuate. It is a three-story building that is straight. That is, 1 to 8 patterns spread radially, and A to C patterns have an arc shape (see FIG. 2). The steel structure 1 is a structure in which the first floor portion is a station platform 1a shown as an example of an existing facility, and an upper block 1b serving as a promenade of a station building is spanned over the second floor above. is there. Of course, this existing facility is not limited to a single floor, but depends on the number of floors of an existing station building or the like over which the number of floors of the sky block 1b serving as a promenade is also passed.

[Construction method]
Next, taking the case where this steel structure 1 is constructed as an example, a construction method for a steel structure according to an embodiment of the present invention will be described. The outline of the steel structure construction method according to the present embodiment is as follows: (1) Independent pillar installation process, (2) Start frame construction process, (3) Frame assembly (4) Frame structure moving process, (5) Frame structure adding process, (6) Extension / moving process, (7) Column joining process, (8) Beam replacement process, and so on. A part of the block of the structure 1 is constructed in advance, and the block is used as a starting gantry. The steel frame assembled on the starting gantry is slid while being supported by an independent column. It is a construction method that performs the method. Hereinafter, each of these steps will be described in detail. 3-25 is explanatory drawing which showed these each process with the schematic elevation and the top view in the case of constructing the steel structure 1. FIG.

(Advance preparation)
First, prior preparation for construction work will be described mainly with reference to FIGS. 3 and 4. FIG. 3 is an explanatory view showing the preliminary preparation of the steel structure construction method according to the embodiment of the present invention in a schematic elevation view, and FIG. 4 is an explanatory view showing the process in a schematic plan view.
First, in consideration of the frequency of use of the home, surrounding space, etc., the construction range of the steel structure 1, that is, the area below the upper block 1 b, the area where the starting gantry 3 described later is to be installed (Hereinafter referred to as a starting gantry installation area) is selected, and a tower crane TC having the entire starting gantry installation area within the working radius is installed as a lifting device. Further, a predetermined area other than the starting gantry installation area within the construction range of the steel structure 1 is selected as an area where an independent pillar 2 described later is to be installed (hereinafter referred to as an independent pillar installation area). Therefore, inevitably, the independent pillar installation area is almost outside the working radius of the tower crane TC. In the present embodiment, 1 to 4 types of 3 spans are selected as the starting gantry installation area, and 5 to 8 types of 3 spans are selected as the independent pillar installation area.

  In parallel with the installation work of the tower crane TC, in a predetermined location according to the design of each intersection point or the like, that is, in the steel structure 1 of the present embodiment, 1 to 8 types shown in FIG. A foundation pile 1c indicated by a broken line is constructed by excavation, bar arrangement, placement and the like at each of the intersections of ~ C. Naturally, the foundation pile to be constructed is determined by the structural design, and there may be a pile other than the on-site pile such as a PC pile. In that case, the foundation pile 1c is constructed | assembled with the construction method according to the kind of pile. At this time, when the platform 1a is present at the installation location of the foundation pile 1c, it is preferable to dismantle and remove the periphery of the location of the platform 1a to the extent that does not hinder the construction. In addition, the code | symbol 1d in a figure is an upper house of a platform, and when construction of a foundation pile is troubled, it is preferable to also remove these platform upper houses 1d partially.

(1) Independent pillar installation process Next, an independent pillar installation process is demonstrated mainly using FIG.5 and FIG.6. FIG. 5 is an explanatory view showing the independent pillar installation process of the construction method in a schematic elevation view, and FIG. 6 is an explanatory view showing the process in a schematic plan view.
In this independent column installation process, in the independent column installation area selected as described above, the first node column is erected as an independent column 2 on each foundation pile 1c, and the independent column 2 and the foundation pile 1c are joined. It is a process to make. The independent pillar refers to a pillar for which a beam connecting the pillars is not yet constructed.

  As described above, the lifting and building method of the independent pillar 2 is an area where the independent pillar installation area is an area where it is difficult to work by stopping the train operation, and a tower crane that is a permanent fixed lifting device. Since it is almost outside the working radius of TC and is a dangerous work with the risk of a fall accident, a self-propelled hydraulic crane or the like must be carried in and installed outside the train operation time. Therefore, in this independent pillar installation process, after turning off the energization of the feeder cable at night, which is outside the train operation time, after replacing and curing the overhead wire etc. over the track, carry in the lifting equipment such as a railroad crane. Installed and lifted up the independent pillars 2 carried in with a track-rail truck, etc. one by one with a road-rail crane, and joined to the foundation pile 1c by tightening anchor bolts in the same way as a general steel frame construction method. Execute by the method of restoring the last changed overhead line. However, as disclosed in Japanese Patent Application Laid-Open No. 2007-321399, when the independent pillar 2 is erected using a handling machine and a rail-carriage truck, the trolley wire and other overhead wires such as feeders Construction is possible without refilling work, which is preferable because work time and labor can be reduced.

  In addition, since the steel structure 1 is a building in which the sky block 1b serving as a promenade is constructed on two or more floors of the existing floor, in the independent column installation process of the construction method according to the present embodiment, the first column is used as the foundation. This process is completed if the erection is performed on the pile 1c. However, when the sky block is constructed on, for example, the third floor or higher (that is, when the promenade is extended from the third floor of the existing station building), the sky block is constructed from the first node. Only the pillars are sequentially joined up and down as independent pillars up to the node where the top of the pillar exceeds the floor height of the floor. Also, the first node may be segmented (for example, the 0th node and the 1st node) according to the situation such as the vehicle regulation of the steel material carry-in route and the weight of the column. The upper and lower members are joined by fastening them with a high tension bolt or the like via an erection piece or the like, and then welding the four circumferences. The unnecessary erection piece and the like are removed by cutting with a gas cutter or a cutting grindstone after completion of welding.

[Independent pillar]
Next, the structure of this independent pillar 2 is demonstrated using FIG.
FIG. 26 is a perspective view showing the vicinity of the top end of the independent pillar. The independent pillar 2 is a BOX pillar provided with a beam joint bracket for beam joining which is substantially the same as a general steel pillar except for the vicinity of the top end. As shown in FIG. Four beam joint brackets 21 provided on each of the four side surfaces of the upper part of the column main body 20, a sliding material 22 provided on the top end of the column main body 20, and 2 provided on two side surfaces near the top end of the column main body 20. It comprises two guide mounting brackets 23 and the like.
In addition, when the said pillar is located in a corner | angular part or an edge part, naturally the beam joining bracket may not be provided in the side surface which faces an external side by design.

(Sliding material)
This sliding member 22 is a member having a substantially trapezoidal vertical section having an inclined surface 22a on the tower crane TC (starting gantry 3) side, and a guide beam of a moving frame described later is inclined along the inclined surface 22a. It has a function of guiding upward. Further, the material of the sliding material 22 is preferably one that is excellent in wear resistance, mechanical strength, etc. and has good sliding properties with a steel material because of the sliding of heavy objects. (SS material), rolled steel material for welding (SM material), general steel material such as rolled steel material for building structure (SN material), stainless steel, resin whose surface has been coated with fluororesin to improve lubricity, etc. Any material having wear and mechanical strength can be applied. Monomer cast nylon (MC nylon (registered trademark, Nippon Polypenco Co., Ltd.)) is employed as the material of the sliding material 22 according to the present embodiment. This monomer cast nylon is a polymer of nylon (polyamide resin), the main raw material, polymerized and molded under atmospheric pressure, resulting in the characteristics of nylon (mechanical strength, heat resistance, wear resistance, chemical resistance, machinability) ), And the use of monomer cast nylon as a sliding material is characterized by excellent properties and lubricity with the steel material. In addition, even when the surface of the sliding material 22 has been scraped off due to contact / collision with the steel material, there is an advantage that the slipperiness with the steel material is hardly deteriorated, and it is possible to stably supply at a low cost. preferable.

(Horizontal guide)
The guide mounting bracket 23 is attached to the side surface of the column body 20 on the tower crane TC side (starting gantry 3 side; one way side) and the opposite side (eight ways side) so that the flange surface is vertically arranged. This is a bracket made of H steel with a wide flange width, and at its top end (upper surface), a horizontal guide 24 made of an L-shaped angle is attached to the edge of the flange so that a guide surface for guiding an inner guide described later is a vertical surface. It is erected along. The horizontal guide 24 has a function of restricting horizontal movement in the vertical direction with respect to guide surfaces such as guide beams and inner guides of a moving frame, which will be described later, and guiding in a predetermined movement direction.
In addition, since the column main body 20 and the beam joint bracket 21 are the same as a general steel column material, description is abbreviate | omitted.

(2) Starting gantry construction process Next, the starting gantry construction process will be described with reference to FIGS. FIG. 7 is an explanatory view showing the start gantry construction process of the construction method in a schematic elevation view, and FIG. 8 is an explanatory view showing the process in a schematic plan view.
This starting gantry construction process is based on the first conventional steel structure construction method using a tower crane TC, and the first joint in the selected starting gantry construction area of the steel structure 1 main structure. After installing the pillars 30 and the first beam 31 and installing a deck plate or composite floor plate (not shown) on the beam 31 and setting predetermined reinforcements and inserts, the second floor This is a step of constructing the starting gantry 3 by placing a floor slab 32. At this time, when the platform upper house 1d comes into contact with the starting gantry 3, that is, when it comes into contact with the pillar 30 or the beam 31 of the first node of the steel structure 1, or when the platform upper house 1d is replaced with a new one by design. When it is necessary to remove the platform upper house 1d, it is removed before the starting gantry construction process.

  In addition, depending on the situation, such as there is an empty space in the adjacent area of the construction range of the steel structure 1, a part of the main structure of the steel structure 1 is used as the starting gantry 3 (see also the stippled portion in FIG. 1). Instead, a temporary steel structure may be constructed to serve as the starting frame. Of course, a temporary steel structure and a part of the main structure of the steel structure 1 can be combined to form a starting frame. In addition, when the sky block is constructed on a predetermined floor of the third floor or more, it is constructed to a beam immediately below the predetermined floor, and a floor slab of the predetermined floor is placed to form a starting frame.

  In principle, the tower crane TC lifts and builds steel materials and the like (the first column 30 and the first beam 31, the deck plate, etc.) in this starting gantry construction process. However, the pillar 30 of the first node, the beam 31 of the first node, and the like may be performed by the above-described handling machine, or the tower crane TC and the handling machine may be used in combination. The column 30 and the beam 31 are joined by friction with high tension bolts in the same manner as a general steel structure construction method, and the column 30 and the foundation pile 1c are joined by an independent column installation process. Join with anchor bolts in the same way as The starting gantry 3 constructed as described above has a function as an assembly stage of a moving frame to be described later and a moving means for moving the moving frame by constructing a part of the main structure of the steel structure 1 in advance. It functions as an installation stand and as a fallen object curing facility during assembly.

  Further, a sliding material 30a similar to that of the independent pillar 2 is provided at the top end of each pillar 30 of the starting gantry 3, and other than one way which is the rear end side in the movement direction of the moving frame, that is, 2-4. A guide mounting bracket 30b similar to the independent column 2 and a horizontal guide (not shown) (see the horizontal guide 24 shown in FIG. 26) are further mounted on the street columns. Note that the sliding member 30a provided at the top of the column 30 of the starting gantry 3 does not necessarily guide the guide beam described later, so it does not have to be provided with an inclined surface, but an inclined surface is provided for unifying parts. There is no problem.

  The above-described (1) independent pillar installation process and (2) start frame construction process do not have to be carried out in this order, and the lifting device and construction area are basically different. It is also possible to perform the processes simultaneously in parallel. Since it is possible to shorten the construction period, it is more preferable to carry out simultaneously. Of course, the independent pillar installation process may be performed after the start gantry construction process is performed first according to circumstances such as restrictions on the dismantling time of the platform superior 1d and the train operation status of the independent pillar installation area.

(3) Frame Assembly Process Next, the frame assembly process will be described with reference to FIGS. 9 and 10. FIG. 9 is an explanatory view showing the frame assembly process of the construction method in a schematic elevation view, and FIG. 10 is an explanatory view showing the process in a schematic plan view.
In this frame assembly process, the start structure 3 constructed in the start structure construction process is used as an assembly stage, and 5 to 8 spans of 3-8 spans above the independent pillar installation area in the upper block 1b of the steel structure 1 are provided. This is a step of assembling by assembling the pillars / beams of the second node to the third node and the beam of the first node as the moving frame 4 on the column 30 of the starting gantry 3. Since the start gantry 3 according to the present embodiment is for 3 spans, the 3 spans can be built up to the maximum of 3 spans, and details will be described later. This is because it is necessary to construct it from the part farthest from the starting gantry 3 for the purpose of sliding. At this time, the five columns are constructed on one column of the starting gantry 3, and the eight columns are constructed on four columns of the starting gantry 3.

  The lifting and construction of steel materials and the like in this frame assembly process are also performed in principle by a conventional steel frame construction method using a tower crane TC. The second joint column 40 is provided with a first beam joint 40a similar to that of a general steel frame column at the top, and the bottom of the column is similar to the above-described beam joint bracket 21 and the like. The second bracket 40b is attached at the time of shipment from the factory, and is different in that the corresponding first-node beams 41 are attached between the second brackets 40b of the pillars 40. Moreover, after assembling the movable frame 4 as will be described later, the second column 40 and the column 30 of the starting gantry 3 are only temporarily fixed and are not joined by welding, for the sake of sliding.

  First, the column 40 of the second node is built while checking the vertical and horizontal using the tower crane TC, and the first beam 41 and the second beam 42 are temporarily tightened between the first bracket 40a and the second bracket 40b, respectively. Then, the beam 41 is joined to the column 40 by high tension bolts until the final fastening. The third node 43 and the third beam 44 are similarly constructed, and the third column 43 and the second column 40 are fastened with an erection piece, and then welded together around the four sides. In other words, the assembly of the movable frame 4 includes the rebuilding except that the second column 40, which is the lowermost column of the movable frame 4, and the column 30 of the start frame 3 used as an assembly stage are not joined. The construction is completed as usual by the conventional steel structure construction method until the construction is completed, and the first joint beam 41, which is the beam directly under the span, is placed between the second joint pillar 40, which is the lowermost pillar of the movable frame 4. Furthermore, it carries out by joining.

  As described above, the first beam 41 is joined to the movable frame 4 when the movable frame 4 is increased in rigidity, and the movable frame 4 is pushed horizontally from the starting frame 3 as will be described later. Temporarily cantilevered to prevent the movable frame 4 from bending downward, and the first beam 41 installed in the independent column installation area outside the working radius of the tower crane TC is directly above the final mounting position. This is for easy transportation. In addition, as shown in FIG. 9, in order to raise rigidity further, you may provide the brace | blade 45 as needed.

Moreover, it is preferable to install a deck plate or a synthetic floor board (not shown) on the second beam 42 and the third beam 44 using a tower crane TC. There is no permanent lifting device such as a tower crane TC, and these members are installed in an independent column installation area where the operating time of the lifting device is limited so that the lifting device can be carried in at night work. This is because there is no need for lifting, and night work and the like can be shortened, and the construction period and cost can be reduced as a whole.
In the frame assembly process according to the present embodiment, a guide member that guides the movable frame 4 in a predetermined curved shape (an arc shape along the planar shape of the steel structure 1 shown in FIG. 2). 5 is attached to the lowermost layer of the movable frame 4 below the beam 41 and the column 40 of the first node.

[Guide member]
Next, the guide member will be described mainly with reference to FIGS. FIG. 27 is a partially enlarged elevation view showing the vicinity of the front end of the starting gantry at the lower part of the moving frame, FIG. 28 is a top view showing the planar shape of the inner guide, and FIG. 29 mainly shows the guide rail and the downward displacement prevention material. It is a perspective view.
As shown in FIG. 9, the guide member 5 includes a guide beam 5a attached to the lower surface of the flange of the second bracket 40b on the front end side in the moving direction, and a lowermost layer of the moving frame 4 from the rear end of the guide beam 5a. An inner guide 5b having a circular arc shape that is continuously provided along the beam 41, and a floor of the starting gantry 3 that is formed in an arc shape that is substantially the same shape as the inner guide 5b and directly below the inner guide 5b. A guide rail 5c laid on the slab 32, and a rod-like downward displacement preventive member 5d projecting downward from the bottom surface near the rear end of the inner guide 5b with the lower end fitted into the guide rail 5c. , Is composed of.

(Guide beam)
The guide beam 5a may be a steel material having a predetermined inclined surface on the bottom surface. However, in the present embodiment, as shown in FIG. 27, the upper flange is the lower surface of the flange of the second bracket 40b using H steel as a base material. The other lower flange is processed so as to become an inclined surface 50 inclined obliquely upward toward the front end (eight kinds), and this inclined surface 50 is slipped as described later. It has the function of guiding the front end of the movable frame 4 obliquely upward by slidingly contacting the inclined surface 22a of the material 22 (see FIG. 39). The slope of the inclined surface 50 naturally changes depending on the length of one span that pushes out the moving frame 4 and the rigidity of the moving frame 4 (cross-sectional performance of the constituent members), but the vicinity of the front end of the moving frame 4 is Considering the angle of the guide beam 5a when coming into contact with the independent column 2, 1/50 or more and 1/10 or less are preferable. If it is within the range of a general steel structure from a test or the like, 1/30 (the angle θ formed with the horizontal plane) = 1.9 °) is optimal. By making the inclined surface 50 in such a range of gradient, when the deflection of the front end portion of the movable frame 4 is corrected and guided, the frictional resistance with the sliding material 22 is reduced and the sliding movement is performed more smoothly. Because you can.

(Inner guide)
The inner guide 5b may be any member that can guide the movable frame 4 in a predetermined moving direction. In the present embodiment, the inner guide 5b is made of H steel having a width of about 300 mm and a height of about 300 mm. 28, as shown in FIG. 28, a steel structure to be constructed by being processed into a gentle arc shape according to the planar shape of each of the attached streets (A to C) (although depending on the street, the curvature radius is approximately R = 500 m). 1 has a function of guiding the moving frame 4 in a curved moving direction along each of the streets (A to C). The inner guide 5b is attached to the movable frame 4 by holding the upper flange of the inner guide 5b and the lower flange of the beam 41 of the movable frame (partially the lower end of the column 40) with an H steel clamp jack. For example, the temporary guide member 5 is fixed at predetermined intervals so that the guide member 5 can be removed from the main moving frame 4. The same applies to the attachment of the guide beam 5a to the second bracket 40b.

(Guide rail)
In the present embodiment, as shown in FIG. 29, the guide rail 5c is made of channel steel whose plane shape is substantially the same as each inner guide 5b, and each inner guide 5b on the floor slab 32 of the starting gantry 3 is formed. The rear end of the movable frame 4 is guided along the planar shape of the guide rail 5c by guiding a later-described downward displacement preventing member 5d attached to the inner guide 5b. 4 has a function of preventing the direction in which the rear end portion of the 4 is pushed and the direction in which the rear end portion is advanced from being shifted. As will be described later, the span for laying the guide rail 5c is 1 to 3 when the span for moving the movable frame 4 once (one work day) is 2 spans. When is one span, it may be between one and two ways. The guide rail 5c may be laid on the floor slab 32 of the starting gantry 3 before assembling the movable frame 4 as in the slide moving means described later. This is because the moving frame 4 must be laid immediately below the beam 41 of the moving frame 4, so that the moving frame 4 becomes a hindrance later, making it difficult to carry in and set up with a lifting device such as a tower crane TC. .

(Downward displacement prevention material)
In the present embodiment, the downward displacement prevention member 5d is formed of a square square steel pipe having a side of about 150 mm as shown in FIG. 29, and projects downward from the bottom flange near the rear end of the inner guide 5b. The lower end of the guide rail 5c is installed in the guide rail 5c. As described above, the guide rail 5c is guided to prevent the rear end portion of the movable frame 4 from being displaced. Have.
Thus, by providing the guide rail 5c and the downward displacement prevention material 5d, the downward displacement prevention material 5d is guided by the guide rail 5c in the next frame movement process, and below the rear end of the movement frame 4 The movable frame 4 can be slid in a predetermined direction while preventing displacement. In addition, when moving the moving frame 4 at least two spans at a time, it is necessary to once remove the downward displacement prevention member 5d and reattach it at the same place as described later when exceeding the column 30 of the starting gantry 3. .

  Note that the guide member 5 described above is configured so that the steel structure 1 to be constructed has a planar shape as shown in FIG. If the direction is a straight line, the main beam 41 attached to the lowermost layer of the moving frame 4 is used as an inner guide, and the second bracket 40b on the front end side in the moving direction has the inclined surface 50 as described above. It doesn't matter. By doing so, it is not necessary to attach the guide member 5, and the cost can be reduced.

  In the frame assembly process, the movable frame 4 and the guide member 5 are assembled as described above. However, before the movable frame 4 is assembled, that is, before the frame assembly process or at the initial stage of the frame assembly process. The slide moving means 6 used in the frame moving process, which is the next process, may be set on the floor slab 32 of the starting gantry 3 (see FIG. 10). Since the slide moving means 6 is set directly below the lowermost beam 41 of the moving frame 4 as will be described later, a lifting device such as a tower crane TC is subsequently used because the moving frame 4 becomes an obstacle. This is because it becomes difficult to carry in and install in Japan.

[Slide moving means]
Next, the configuration of the slide moving means according to the present embodiment will be described with reference to FIGS.
30 is an overall side view showing the slide moving means according to the present embodiment, FIG. 31 is a side view showing the horizontal jack according to the present embodiment, FIG. 32 is a plan view of the horizontal jack, and FIG. FIG. 34 is a front view showing a normal use state of a commercially available H steel clamp jack, FIG. 34 is a side view showing a shaped steel clamp jack according to the present embodiment, and FIG. 35 is a bottom view showing the same shaped steel clamp jack. These are front views showing an isomorphous steel clamp jack. (A) of FIG.35 and FIG.36 represents the time of clamping (gripping state), and (b) represents the time of unclamping (open state), respectively.

  As shown in FIG. 30, the slide moving means 6 has a reaction force frame 60 fixed to the floor slab 32 of the starting gantry 3 to obtain a reaction force, and both ends are so-called clevises, and one end is a reaction force. The main jack includes a horizontal jack 61 pin-connected to the gantry 60, and a shape steel clamp jack 62 that is connected to a clevis at the other end of the horizontal jack 61 and grips a flange of the shape steel (beam 41 or inner guide 5b). (A pump unit 63, a control box 64, and a centralized control panel 65 described later are also included in the slide moving means).

(Reaction force stand)
The reaction force pedestal 60 is firmly fixed to the floor slab 32, and the shape is not particularly limited as long as it can be connected to the clevis of the horizontal jack 61. 2) In the starting gantry construction process, if a mounting hardware (not shown) such as an L-shaped plate is set before placing the concrete of the floor slab 32, the reaction force frame 60 is fixed to the starting gantry 3 to this mounting hardware. This is preferable because the reaction force base 60 can be easily simply screwed or welded (see FIG. 10).

(Horizontal jack)
As shown in FIG. 30, the horizontal jack 61 has one end that can be connected to a shaped steel clamp jack 62 and the other end that can be connected to an inanimate body such as a reaction force stand 60 and has a predetermined slide movement capability. A commercially available horizontal jack may be used, but as shown in FIGS. 31 and 32, the horizontal jack 61 according to the present embodiment has two peaks on the bottom side (main body side) and one mountain on the top side (stroke side). This is a pull / push double acting hydraulic jack (Oxjack Co., Ltd .: JTP-100100) capable of a horizontal stroke of 1 m per stroke, with a capacity of 1000 kN and a pressing force of 400 kN. It has been adopted. This horizontal jack 61 has a piston rod 61b that protrudes or retracts from the jack body 61a and reciprocates so as to reciprocate so that the one connected to the clevis at one end on the top side or the bottom side is connected to the other end. The reaction force is obtained from the force stand 60 and moved horizontally.

(Shape clamp)
As shown in FIG. 30, the shape steel clamp jack 62 is connected to one end of the horizontal jack 61, and is made of a shape steel (such as a groove shape steel and an angle steel) such as an H steel and an I-shaped steel (including rail material). Steel frame steel flanges with a predetermined horizontal reaction force (including unassembled beams with open webs such as lattice beams, lattice beams, strip plates, and honeycomb beams). What is necessary is a so-called shaped steel clamp jack that can be gripped, but as the shaped steel clamp jack 62 according to the present embodiment, there are 8 built-in clamping jacks with a gripping force of 150 kN and a stroke of 25 mm. A single-system hydraulic H steel clamp jack (Oxjack Co., Ltd .: HC-80) with a horizontal reaction force of 800 kN is used. However, as shown in FIG. 30, this commercially available H steel clamp jack 62 'is originally used by being placed on the top end flange of the H steel to be gripped, as shown in FIG. There is a problem that the H steel clamp jack 62 ′ is detached from the H steel at the time of unclamping (open state) when it is set so as to hold the lower end flange of the H steel whose top and bottom are reversed. Therefore, the structural steel clamp jack 62 according to the present embodiment is improved to the configuration shown in FIGS. In addition, the same code | symbol is attached | subjected to the same structure of the H steel clamp jack 62 'and the shaped steel clamp jack 62 which concerns on this Embodiment in the figure, and "'" is attached | subjected to the different structure.

  As shown in FIG. 34 to FIG. 36, this section steel clamp jack 62 has left and right sides (vertical and horizontal to the axis of the H steel to be gripped and horizontal) formed of flat plates having a substantially U-shaped planar shape and a concave portion facing outward. Direction) A pair of base plates 63a, 63b, and front and rear (axial direction of gripping H steel) attached across the two base plates 63a, 63b, and support plates 64a, 64b made of two flat plates, and a base plate A pair of left and right clamp arms 65a and 65b having a U-shaped cross-section that fits in the planar recesses 63a and 63b, and between the two support plates 64a and 64b and along the base plates 63a and 63b. A pair of left and right opening / closing jacks 66a having piston rods that can be attached to and removed from the left and right (inside and outside) and that open and close the clamp arms 65a and 65b 66b, and four clamp jacks 67a to 67h in total, which are attached to the base plates 63a and 63b and can move the piston rods in and out to press the clamp arms 65a and 65b downward. ing.

  Unlike the commercially available H steel clamp jack moving casters 63c ′ shown in FIG. 33, the lower ends of the H steel gripped via the L-shaped brackets are provided at the four corners of the outer ends of the base plates 63a and 63b. A moving caster 63c is provided so as to be able to run on the upper surface of the flange, and even if the shape steel clamp jack 62 is mounted upside down from the normal position, there is no possibility of dropping at the time of unclamping. Further, on the upper surfaces of the base plates 63a and 63b, lateral misalignment prevention wheels 63d that can travel along the edges of the H steel to be gripped are pivotally supported at the four corners of the outer ends of the base plates 63a and 63b. The distance between the base plates 63a and 63b can be adjusted according to the width of the H steel gripped by the fixed distance from the support plates 64a and 64b. For this reason, when setting the shape steel clamp jack 62 to the H steel, the base plates 63a and 63b are fixed to the support plates 64a and 64b once in a free state, and the width of the H steel is reduced while reducing the left and right widths. The moving caster 63c can be set on the lower end flange so that the moving caster 63c does not get in the way when set.

  Further, two clevis plates 64c and 64d are suspended from the support plates 64a and 64b so as to straddle them, and the clevis plates 64c and 64d are reinforced by a plurality of flat plates, and are shaped steel clamps. A hanging hardware 64e used for lifting and moving the jack 62 is also provided.

  The clamp arms 65a and 65b are formed in a substantially U-shaped cross section including an upper plate portion 65c (65d), a side plate portion 65e (65f), and a lower plate portion 65g (65h). The piston rod of 66b is connected to the tip of the piston rod through a long hole 65i (65j) in a state where the vertical movement is free, and is pressed by the piston rods of the open / close jacks 66a, 66b, whereby the side plate portion 65e (65f). A plurality of opening / closing vehicles 65k pivotally supported on the edges of the base plate 63a, 63b slides between the vehicle receiving pieces 69a, 69b, 69c, 69d and the base plates 63a, 63b so as to clamp the arm 65a. , 65b opens and closes, and the clamp jacks 67a to 67h are used to place the lower plate portion 65g (65h) inside the clamp arms 65a, 65b. The clamp arms 65a and 65b are pressed down to hold the lower flange of the H steel (the beam 41 or the inner guide 5b) between the upper plate portion 65c (65d) and the base plate 63a and 63b. Yes.

  The open / close jacks 66a and 66b and the clamp jacks 67a to 67h are operated in a direction to close the open / close jacks 66a and 66b by injecting clamp pressure oil, and a hydraulic sequence valve is caused by an increase in pressure in the jack when closed. Is opened, and the piston rods of the clamp jacks 67a to 67h are projected to clamp the H steel. Then, by injecting the clamp release pressure oil, the piston rods of the clamp jacks 67a to 67h are retracted, the hydraulic sequence valve is opened by the pressure increase in the jack at this time, and the open / close jacks 66a and 66b are opened. Since it is comprised so that it may act | operate, these several jacks can be controlled by one hydraulic pump unit. In the drawing, the hydraulic hose port 68a is on the clamp side, and the hydraulic hose port 68b is on the unclamp side.

  As described above, the configuration of the slide moving unit 6 according to the present embodiment has been described. However, the slide moving unit of the present invention is not limited to these configurations as long as the movable frame 4 can be slid horizontally. In particular, the shape steel clamp jack 62 has been described as being configured such that the moving caster 63c rides on the lower end flange of the H steel. However, the shape steel clamp jack 62 ′ may be configured so that it does not fall even in an unclamped state.

  One slide moving means 6 may be installed as long as it has the ability to slide the movable frame 4, but in this embodiment, as shown in FIGS. 9 and 10, the starting frame is used. On the floor slab 32 having three to four spans corresponding to the front end of three, two in total along the respective streets A to C are provided in a total of six. At this time, as shown in FIG. 9, the reaction force frame 60 may be integrated into a total of three reaction units, one for each of the horizontal jack 61 and the shape steel clamp jack 62.

(Operation and control of slide moving means)
Next, the operation and control of the slide moving means will be described. FIG. 37 is an image diagram showing an outline of a control system for two slide moving means installed in series. FIG. 38 is an explanatory diagram showing an example of a control operation of the slide moving means installed in series.
As shown in FIG. 37, the outline of the control system for the slide moving means according to the present embodiment is as follows. As shown in FIG. 37, the pump unit 63 for controlling the hydraulic pressure of the horizontal jack 61 and the steel bar clamp jack 62 of each slide moving means 6 Control with the control program (programmed load, stroke numerical value and slide distance display, jack speed adjustment, emergency stop action when each numerical value exceeds the control standard value) This is a system for centralized management and control by displaying on the monitor of the centralized control panel 65.

  Using this control system, in the slide moving means according to the present embodiment, as shown in FIGS. 9 and 10, two units are arranged in series for each of the moving frames 4 to C, As shown in FIG. 38, the movement of the two slide moving means (No. 1 and No. 2) is shifted by half a cycle, and the moving frame 4 is continuously slid and controlled. However, in general, the static friction coefficient and the dynamic friction coefficient have a larger static friction coefficient, and the greatest force is required at the start of movement. Therefore, in the present embodiment, at the start of movement, the two horizontal jacks 61 are simultaneously operated at a low speed (slow speed) for half a cycle while the chuck (section steel clamp jack 62) of the slide moving means 6 is fixed. To control. That is, the clamp arms 67a to 67h are used to press the lower plate portions 65g (65h) of the clamp arms 65a and 65b from the inside, and the clamp arms 65a and 65b are pressed down, so that the upper plate portion 65c (65d) and the base plates 63a and 63b. The horizontal jacks 61 of the two slide moving means 6 (No. 1 and No. 2) set with the piston rod 61b fully extended while holding the lower end flange of the H steel between the piston rod 61b Is retracted at a low speed (slow speed) until half is accommodated in the jack body 61a. Subsequently, the horizontal jack 61 of one slide moving means 6 (No. 1) is continuously operated at a normal speed until the piston rod 61b is completely accommodated in the jack body 61a, and the other slide moving means 6 (No. 1) is operated. In 2), the chuck (section steel clamp 62) is opened and controlled to operate at a normal speed until the piston rod 61b is fully extended. Next, the chuck of one slide moving means 6 (No. 1) is opened to extend the horizontal jack 61, and the horizontal jack 61 is fixed while fixing the chuck of the other slide moving means 6 (No. 2). The moving frame 4 is contracted and slid and moved. Thereafter, as shown in FIG. 1 and No. No. 2 slide moving means 6 are alternately operated at a normal speed, and immediately before the guide beam 5a attached to the movable frame 4 abuts on the independent column 2, these No. 1 1 and No. The second slide moving means 6 is stopped, and the sliding movement of the movable frame 4 is stopped. Then, after confirming the downward vertical displacement amount and removing the downward displacement prevention member 5d, the two frames are simultaneously operated at a low speed, and the moving frame 4 is controlled to slide to a predetermined position.

  In this way, by alternately operating the two slide moving means, the movable frame 4 can be continuously slid, so that the slide movement distance per work time can be extended and work efficiency is improved. To do. For this reason, even if the possible stoppage time is only about 90 minutes, the moving frame can be moved by two spans or more, and the construction period can be greatly shortened and the cost can be reduced. it can. Further, the H steel of the movable frame 4 (the beam 41 joined to the lowermost layer of the movable frame 4 or the inner guide 5b attached thereto) is attached to the chuck (section steel clamp jack 62) of any slide moving means. As a result, the mobile frame 4 did not deviate from the predetermined direction of movement due to excessive inertia, and a sudden accident such as an earthquake or power failure occurred. Even in such a case, the sliding movement of the moving frame 4 can be stopped, and escape prevention can be always achieved during the frame moving process described later.

  When the greatest force is required at the start of slide movement, the two slide movement means arranged in series (that is, all the slide movement means) are simultaneously operated at a low speed, and an inertial force is applied to the movable frame 4. Since the operation is switched to the normal speed alternating operation, there is no waste and the cost performance can be optimized. Therefore, further cost reduction can be achieved.

(4) Frame body moving step Next, the frame body moving step will be described mainly with reference to FIGS. FIG. 11 is a schematic elevation view showing a state in the middle of the frame moving process of the construction method, FIG. 12 is a schematic plan view showing a state in the middle of the movement, and FIG. FIG. 14 is an explanatory diagram showing the movement completion state of the same process in a schematic plan view.
In this frame moving process, the moving frame 4 is pushed almost horizontally over the platform 1a from the starting frame 3 by the slide moving means 6 installed in the vicinity of the front end of the floor slab 32 of the starting frame 3. This is a step of sliding in the direction (curved shape along the planar shape of the steel structure 1).

  11 and 12 show a state immediately before the guide beam 5a of the movable frame 4 abuts against the sliding member 22 of the independent column 2, and thus the movable frame 4 is pushed out of the starting frame 3. The span between the 5 and 7 ways of the moving frame 4 on the starting gantry 3 overlaps, and the span between the 7 and 8 ways, which is the front end, approaches in a cantilevered state. Will be put out. For this reason, the movable frame 4 is displaced downward at the front end portion, but it is not preferable for safety if the downward displacement is excessively larger than an assumed value. Therefore, when the state shown in FIGS. 11 and 12 is reached, in the frame body moving process according to the present embodiment, as described above, the operation of the slide moving means 6 is temporarily stopped, and this downward displacement amount is centrally controlled. This is confirmed on the monitor of the board 65 (see FIG. 37) and visually. If there is no abnormality, the downward displacement prevention member 5d is removed, and the movement of the movable frame 4 is started again by the slide moving means 6.

  FIG. 39 is a partially enlarged side view showing a state in which the front end portion of the moving frame body is in contact with the independent column in the frame body moving step, and FIG. 40 is a perspective view showing the same state. When the front end portion of the movable frame 4 reaches the independent pillar 2 that is the same as 5, as shown in FIGS. 39 and 40, the inclined surface 50 of the guide beam 5 a becomes the inclined surface 22 a of the sliding member 22 of the independent pillar 2. The front end portion of the movable frame 4 is guided obliquely upward by sliding in contact with the movable column body 4 and the independent column 2 is used to remove a part of the load of the movable frame 4 while correcting the downward displacement of the front end portion of the movable frame 4. Come to support. Further, the horizontal moving direction of the movable frame 4 is guided in a predetermined moving direction along the planar shape of the inner guide 5b by the guide surface of the horizontal guide 24 of the independent pillar 2. Next, when the front end portion of the movable frame 4 passes through the five independent pillars 2, the removed downward displacement prevention member 5d is reattached to a predetermined position. And just like when the five independent pillars 2 are reached, after the sliding movement of the moving frame 4 is stopped immediately before the six independent pillars 2, as shown in FIGS. Move until the eight pillars 40 of the moving frame come on the six independent pillars 2. In this way, by improving the configuration and control method of the slide moving means 6, it is possible to move two spans at a time in one work day (within 1 train stoppage time), so the work days can be significantly reduced. it can.

[Temporary fixing jig]
Next, a temporary fixing jig for temporarily fixing the moving frame to the independent column at the end of the frame moving process will be described with reference to FIG.
FIG. 41 is an explanatory diagram showing an example of temporary fixing at the end of the frame moving process in a side view. Reference numeral 7 in the figure denotes a temporary fixing jig, which is a hydraulic clamp via a three-dimensional universal joint 7b at both ends of a sturdy bar (wire material such as a pipe material) 7a. A commercially available H steel clamp jack 7c (which may be smaller than the above-described shape steel clamp jack 62) is attached. As shown in the drawing, the temporary fixing jig 7 holds the upper end flange or the lower end flange of the beam joint bracket 21 of the independent column 2 with one H steel clamp jack 7c, and the movable frame with the H steel clamp jack 7c at the other end. 4 has a function of fixing the movable frame 4 to the independent column 2 by gripping the second bracket 40b of the lowermost column 40. By temporarily fixing the moving frame to the independent pillar 2 with the temporary fixing jig 7 in this way, the moving frame 4 is predetermined even when an earthquake occurs before the next moving step is started. It is possible to prevent deviation from the position.

  The temporary fixing jig 7 can be individually attached to the beam joining bracket 21 by holding it with one H steel clamp jack 7c before installing the independent pillar 2 in the independent column installation process. This is preferable because it saves the trouble of lifting. Moreover, since it becomes strong to the shake from all directions by temporarily fixing to a rectangle (diamond shape) with the four temporary fixing jigs 7 for every independent pillar, it is preferable.

(5) Frame body extension step Next, the frame body extension step will be described with reference to FIGS. 15 and 16. FIG. 15 is an explanatory diagram showing the frame extension process of the construction method in a schematic elevation view, and FIG. 16 is an explanatory diagram showing the process in a schematic plan view. As shown in FIGS. 15 and 16, this frame extension process is an empty space between two or three ways of the start frame 3 that is formed by moving the moving frame 4 in the frame moving process. In the upper block 1b of the steel structure 1, the 4th to 5th spans of the second to third columns / beams and the first beam are added to the moving frame 4 above the independent column installation area. It is a process to do. In this expansion, (3) the tower crane TC is used in the same way as the frame assembly process, and the 4th and 5th sections of the second and third sections of the steel structure 1 are constructed as usual. Between the second bracket 40b of the column 40, four to five kinds of first-beam beams 41 are attached, and a brace 45 is also attached between the first-node beam 41 and the second-node beam 42 to increase rigidity.

(6) Expansion / Transfer Process Next, the expansion / movement process will be described with reference to FIGS. FIG. 17 is an explanatory view showing the movement completion state of the first (first) movement process in the expansion / movement process of the construction method in a schematic elevation view, and FIG. 18 is a schematic plan view showing the movement completion state of the movement process. FIG. 19 is an explanatory diagram illustrating the first expansion process in the expansion / movement process in a schematic elevation view, FIG. 20 is an explanatory diagram illustrating the expansion process in a schematic plan view, and FIG. FIG. 22 is an explanatory diagram showing a schematic elevation view of the second movement process in the expansion / movement process, FIG. 22 is an explanatory diagram showing the movement process in a schematic plan view, and FIG. It is explanatory drawing showing an expansion process with a schematic elevation. As shown in FIGS. 17 to 23, the expansion / movement process is performed in the same manner as (4) frame structure movement process and (5) frame structure expansion process, and the front end portion of the movement frame 4 is a steel structure. This is a process that is repeated a predetermined number of times (twice in the illustrated embodiment) according to the span of the steel structure 1 until the end of the object 1, that is, in the present embodiment, reaches eight ways.

  First, as shown in FIG. 17 and FIG. 18, (5) the moving frame 4 having 4 to 5 spans added in the frame adding step, the front end of the moving frame 4 is moved by the slide moving means 6 described above. (4) The slide is moved in the same manner as in the frame moving process until reaching the seven independent pillars 2.

  Next, as shown in FIG. 19 and FIG. 20, in the empty space between the two or three ways of the starting gantry 3, the pillars and beams of the second to third nodes of the third to fourth ways of the upper block 1b are (5) In the same manner as the frame structure extension process, the tower frame TC is added to the movable frame structure 4 using the tower crane TC. Then, the first-node beam 41 is attached between the second brackets 40b of the second-column post 40 in the same manner as in the (5) frame addition process. This is a problem because the construction has already been completed. However, if the beam of the first node is not attached to the moving frame 4, not only the rigidity of the moving frame 4 is lowered and the slide frame cannot endure the slide movement, but also the shape of the slide moving means 6 as described above. Since there is no flange portion (or a flange portion to which the inner guide 5b is attached) held by the clamp jack 62, it cannot be slid. Therefore, in the expansion / movement process according to the present embodiment, a beam having the same shape as the first joint beam is attached as the temporary beam K, and the brace 45, the inner guide 5b, and the downward displacement prevention member 5d are also described above. Install as follows.

  Subsequently, as shown in FIGS. 21 and 22, until the front end of the movable frame 4 reaches the eight independent pillars 2 by the above-mentioned slide moving means 6, that is, one steel structure is provided. The slide is moved to the proper mounting position in the same manner as in the (4) frame moving process. In this way, if the steel structure 1 has 1 to 8 types of 7 spans, this expansion / movement process is completed. However, the span (longitudinal direction) span of the steel structure to be constructed is completed. Accordingly, the extension / movement process is repeated a predetermined number of times as needed until the front end of the moving frame reaches the proper mounting position, which is the end of the steel structure.

  Then, after the movement of the moving frame 4 is completed, as shown in FIG. 23, the two spans of 1 to 3 above the starting gantry 3, that is, the second column / beam, the third column / beam, Using the tower crane TC by the conventional construction method, construction will be done as usual and expanded. At this time, unlike the expansion process described above, it is not moved, so there is no need to attach a temporary beam or a brace between the lowermost pillars.

(7) Column Joining Step Next, the column joining step will be described mainly using FIG. FIG. 24 is an explanatory view showing the column joining process of the construction method in a schematic elevation view. As shown in FIG. 24, in this column joining step, in order to fix the movable frame 4, the second-tier column 40, which is the lowest layer of the movable frame 4, is bonded to the independent column 2 by a bonding method according to the structural design. It is a process to do. Such columns are generally welded, and will be described in the case of joining by welding.

  FIG. 42 is an enlarged partial cross-sectional view of the column joint portion according to the present embodiment. As shown in FIG. 42, the independent pillars 2 and the lowermost pillars 40 of the movable frame 4 are made of the same material as these pillars (they are created by making them round when producing pillars at a factory or the like). The inner guide 5b, which is welded and joined via the spacer S and attached immediately below the column 40, and the sliding member 22 provided at the top end of the independent column 2 are fitted together. However, the guide member 5 such as the inner guide 5b which is obstructive to fitting the joint spacer S is removed. Since this joint spacer S is fitted between the column 40 and the independent column 2 later, the joint spacer S is divided into 2 to 4 parts which are easy to be fitted, and complete penetration welding of butting with the column 40 and the independent column 2 is performed (that is, the column is fixed). Two welding lines can be made once.) Therefore, as shown in the figure, between the column main body of the column 40 and the inner guide 5b, and between the column main body 20 of the independent column 2 and the sliding material 22, there are provided the backing plates PL1 and PL2 for the back of the welded portion. It is preferable to keep it. In addition, these welding is performed on site by manual welding or semi-automatic welding.

(Removal of slide moving means and guide member)
Further, as shown in FIG. 24, after the movement of the movable frame 4 is completed, the guide member 5 and the slide which are no longer necessary after the completion of the column joining process, in parallel with the column joining process, or before the start of the column joining process. The moving means 6, the guide mounting bracket 23 (including the horizontal guide 24) of the independent pillar 2, the temporary beam K, and the brace 45 are removed. At this time, when the column 40 and the independent column 2 are connected by an erection piece or the like for temporary fixing before the column joining, the erection piece or the like that is no longer necessary after the column welding is also used as a gas cutter or a cutting grindstone ( Cut and remove with a sander.

  When the planar shape of the steel structure 1 is not the arc shape mentioned as an example but a rectangular shape, and the predetermined moving direction of the moving frame 4 is a linear slide movement, as described above, the inner guide 5b is Since there is no column connection portion as shown in FIG. FIG. 43 is an enlarged partial cross-sectional view showing a column joint portion according to a modification. As shown in FIG. 43, a guide plate PL3 is provided instead of the inner guide 5b to be fitted and shown in FIG. 42, and the height of the joint spacer S is higher than that of the case shown in FIG. The size is reduced by replacing the guide plate PL3. Moreover, since the 2nd bracket 40b cannot be removed before column joining like the inner guide 5b, the scallop is previously provided in the welding location of the 2nd bracket 40b so that a weld line may not cross | intersect. Thus, the level of the pillar can be adjusted by changing the height of the joint spacer S, so that the top end level of the independent pillar 2 becomes uneven due to unevenness of the level of the foundation pile 1c. Even if there are, the top level of these independent pillars 2 is measured before the frame moving process, and the thickness of the sliding member 22 is changed or a height adjusting plate is inserted. It is more preferable to finally adjust the height of the joint spacer S because the construction accuracy is improved.

(8) Beam Replacement Process Next, the beam replacement process will be described mainly using FIG. FIG. 25 is an explanatory view showing the beam replacement process of the construction method in a schematic elevation view. In this beam replacement process, the beam 41 on the predetermined floor (second floor in the present embodiment) attached between the second brackets 40b of the lowermost column 40 of the movable frame 4 has a final mounting height. That is, it is a step of changing the size between the beam joining brackets 21 of the independent pillars 2. The beam 41 of the first joint attached to the movable frame 4 may be lowered by one by one using a lowering device such as a chain block, hoist, winch or the like. Therefore, there is a problem that the construction period becomes longer and the construction cost increases if each of them is replaced one by one. Therefore, in the beam replacement process according to the present embodiment, the beam 41 attached to the lower part of the lowermost column 40 of the movable frame 4 is lowered together with the deck plate or the composite floor plate installed on the floor at the same time. This is a floor down process for reattaching between the beam joining brackets 21 of the independent pillar 2 which is the regular attachment height (position) of the main beam 41.

(Floor down process)
In this floor down process, first, (7) in parallel with the column joining process or after the completion of the column joining process, the lowering device 8 is installed on the predetermined floor using a support stand or the like that is suspended on the beam 42 on the predetermined floor. It is installed so as to be supported by the beam 42. When it is necessary to remove the platform upper house 1d as described in (2) Starting gantry construction process, the platform upper house 1d is removed at this time. Next, a cable 8a made of a high-strength steel wire such as a PC steel stranded wire that can be wound and unwound by the lowering device 8 is connected (tightened) in a well-balanced manner to the first joint beam 41 to be lowered in consideration of the center of gravity. . Then, all the high tension bolts fastened to the second bracket 40b of the column 40 are removed, the cable 8a is unwound by the lowering device 8, and the beam 41 of the first node is beam-joined to the independent column 2 having the normal mounting height. It lowers between the brackets 21 and completes until the final tightening in the same manner as described above with the high tension bolts on the beam joining bracket 21. Thereafter, the unnecessary second bracket 40b is cut and removed in the same manner as the erection piece.

[Descent device]
As shown in FIG. 25, the lowering device 8 includes a plurality of hydraulic jacks 80 supported by beams 42 on a predetermined floor, a plurality of pump units 81 for controlling the hydraulic pressure of the hydraulic jacks 80, and the plurality of pump units. And a control means (not shown) for centrally controlling 81, and the plurality of pump units 81 are controlled by this control means so that the first joint beam 41 attached between the columns 40 of the movable frame 4 does not tilt together with the floor. It is comprised so that it may descend simultaneously. In the present embodiment, a center hole jack having a winding capacity of 700 kN is adopted as the hydraulic jack 80.

  In this way, the floor down process of lowering the beams of the moving frame 4 together with the floor saves the trouble of lowering the beams one by one and rearranging them, and lowers the heavy objects in the floor down or beam replacement process. The dangerous work of reattaching can be completed within one work day (one electricity stoppage time), and the construction period can be greatly shortened. In addition, since the centralized control is performed by the control means, the descent accuracy can be reduced to 10 mm or less with a deviation on the plane. Therefore, since it is within the joint clearance between the beam and the column, not only the high tension bolt can be easily inserted, but also the beam and the column bracket (the second bracket 40b and the beam junction bracket 21) may come into contact when lowered. And work safety is improved.

  Since the construction work has been completed at the stage when this floor down process is completed, naturally, after that, the steel structure is normally constructed by conventional methods such as concrete placement of floor slabs, fireproof coating, and installation of walls and curtain walls. Finish object 1.

  As described above, the construction method of the steel structure according to the embodiment of the present invention has been described. However, the steel structure that can be constructed by applying this construction method is the steel structure described as an example. The construction is not limited to the planar shape of the object 1 and can be constructed by applying a rectangular shape whose planar shape is long in the moving direction. In short, it may be a steel structure having an upper block over the existing facility over the predetermined floor. In addition, the method of joining the columns / beams and foundation piles is an example, and of course, the joining method according to the structural design of the building to be constructed is used. The sliding material, the horizontal guide, the slide moving means, the guide member, the temporary fixing jig, the lowering device, etc. in the description also show examples, and other known means and devices within the scope of the claims. Needless to say, the above can be adopted as appropriate. Also, the shape and the like shown in the figures are merely examples, and can be changed as appropriate.

It is an elevation view which shows schematic structure of the steel structure mentioned as an example of the steel structure which has the sky block over the existing facility above a predetermined floor. It is a top view which shows schematic structure of the steel structure same as the above. It is explanatory drawing showing the prior preparation of the construction method of the steel structure which concerns on embodiment of this invention with a schematic elevation. It is explanatory drawing showing a process same as the above with a schematic plan view. It is explanatory drawing showing the independent pillar installation process of the construction method with a schematic elevation view. It is explanatory drawing showing a process same as the above with a schematic plan view. It is explanatory drawing showing the starting gantry construction process of the construction method with a schematic elevation. It is explanatory drawing showing a process same as the above with a schematic plan view. It is explanatory drawing showing the frame assembly process of the construction method with a schematic elevation view. It is explanatory drawing showing a process same as the above with a schematic plan view. It is explanatory drawing showing the state in the middle of the frame moving process of the construction method in a schematic elevation view. It is explanatory drawing showing the state in the middle of the movement of a process same as the above with a schematic plan view. It is explanatory drawing showing the movement completion state of a process same as the above in a schematic elevation view. It is explanatory drawing showing the movement completion state of a process same as the above with a schematic plan view. It is explanatory drawing showing the frame addition process of the construction method with a schematic elevation. It is explanatory drawing showing a process same as the above with a schematic plan view. It is explanatory drawing which represents the movement completion state of the 1st movement process among the expansion and movement processes of the construction method with a schematic elevation view. It is explanatory drawing showing the movement completion state of a process same as the above with a schematic plan view. It is explanatory drawing which represents in a schematic elevation view the 1st expansion process among the expansion and movement processes of the construction method. It is explanatory drawing showing a process same as the above with a schematic plan view. It is explanatory drawing which represents the movement process of the 2nd time among the expansion and movement processes of the construction method with a schematic elevation. It is explanatory drawing showing a process same as the above with a schematic plan view. It is explanatory drawing which represents the expansion process of the 2nd time among the expansion and movement processes of the construction method with a schematic elevation view. It is explanatory drawing showing the column joining process of the construction method with a schematic elevation. It is explanatory drawing showing the beam replacement process (floor down process) of the construction method with a schematic elevation view. It is a perspective view showing the vicinity of the top end of the independent pillar which concerns on this Embodiment. FIG. 5 is a partially enlarged elevation view showing the vicinity of the front end of the starting gantry at the lower part of the moving frame according to the present embodiment. It is a look-up figure which shows the outline of the planar shape of the inner guide which concerns on this Embodiment. It is a perspective view which mainly shows the guide rail and downward displacement prevention material which concern on this Embodiment. It is a side view showing the whole slide moving means concerning this embodiment. It is a side view showing the horizontal jack which concerns on this Embodiment. It is a top view of a horizontal jack same as the above. It is a front view which shows the normal use state of a commercially available H steel clamp jack. It is a side view showing the shape steel clamp jack concerning this embodiment. (A) is a bottom view showing the time of clamping (gripping state) of the shape steel clamp jack same as above. (B) is a bottom view showing the unclamped (open state) of the above-described shaped steel clamp jack. (A) is a front view showing the time (clamping state) at the time of clamping of the shape steel clamp jack same as the above. (B) is a front view showing the unclamped (open state) of the above-described shaped steel clamp jack. It is an image figure showing the outline | summary of the control system of the slide moving means which concerns on embodiment. It is explanatory drawing which shows an example of control operation | movement of the slide moving means which concerns on embodiment. It is a partial expanded side view showing the state which the front-end part of a moving frame contact | abuts to the independent pillar in a frame moving process. It is a perspective view showing a state same as the above. It is explanatory drawing which shows an example of the temporary fixation at the time of completion | finish of a frame body moving process with a side view. It is a fragmentary sectional view which expands and shows the column junction part which concerns on this Embodiment. It is a fragmentary sectional view which shows the modification of a column junction part same as the above.

Explanation of symbols

1 Steel structure 1a platform (existing facility)
1b Sky block 1d Platform family (existing facility)
2 Independent pillar 22 Sliding material 23 Guide mounting bracket 24 Horizontal guide 3 Starting structure 4 Moving frame 5 Guide member 5a Guide beam 5b Inner guide 5c Guide rail 5d Downward displacement prevention material 6 Slide moving means 61 Horizontal jack 62 Shaped steel clamp jack ( Shape steel clamp)
7 Temporary Fixing Jig 7a Bar 7b Universal Joint 7c H Steel Clamp Jack (Hydraulic Clamp)
8 Lowering device 8a Cable 80 Hydraulic jack 81 Pump unit

Claims (10)

A steel structure construction method for constructing a steel structure having an upper block above a predetermined floor over an existing facility,
In a predetermined area in the existing facility below the upper block, a plurality of columns from the first node of the steel structure to the node whose top exceeds the floor height of the predetermined floor are set up as independent columns at intervals. An independent pillar installation process,
Outside the predetermined area, a part of the steel structure and / or a temporary steel structure is constructed up to a beam immediately below the predetermined floor, and a concrete on the floor of the predetermined floor is placed to construct a start frame. Gantry construction process,
On the starting frame, a part of the upper block installed above the predetermined area is assembled as a moving frame for a predetermined span from a position farther from the starting frame, and the predetermined block positioned below the assembled moving frame. A frame assembly process for attaching a plurality of beams immediately below the floor between a plurality of lower columns of the lowermost layer of the movable frame;
A frame moving step of sliding the moving frame from the starting frame substantially above the existing facility by a slide moving means installed on the starting frame and sliding it in a predetermined direction for a predetermined span; and
On the starting gantry, a part of the sky block is added for the moving span of the next frame moving process on the rear end side in the moving direction of the moving frame moved by the frame moving process, and this extension A frame structure adding step for attaching a plurality of beams directly below the predetermined floor located below the span between a plurality of lower pillars of the lowest layer of the extension span;
The frame extension process and the frame moving process are repeated as necessary, and the moving block is moved to the final mounting position while adding the moving block, and the addition / movement process for framing the sky block;
A column joining step of joining a plurality of columns in the lowest layer of the above-described upper block constructed in the expansion / movement step to upper portions of the plurality of independent columns;
A beam replacement step of replacing a plurality of beams immediately below the predetermined floor, which are attached between a plurality of lower columns of the lowermost layer of the movable frame, to a final mounting height. Method of construction. At the top of the independent column installed in the independent column installation step, a sliding material having an inclined surface on the starting gantry side is provided,
In the frame assembly process, a guide beam having an inclined surface on the bottom is attached to the lowermost part on the front end side in the movement direction of the movable frame,
In the frame moving step, the front end of the moving frame is guided obliquely upward along the inclined surface of the sliding material by bringing the inclined surface of the sliding material and the inclined surface of the guide beam into sliding contact with each other. 2. The construction method for a steel structure according to claim 1, wherein a part of the moving frame is supported by the independent column and is slid while correcting the deflection of the moving frame upward. . In the frame assembly step and the frame extension step, a deck plate or a composite floor plate is installed on the beam of the movable frame,
In the frame moving process, the deck plate or the composite floor plate is moved together with the moving frame,
The method for constructing a steel structure according to claim 1 or 2, wherein, in the beam replacement step, the deck plate or the composite floor plate is rearranged to a final mounting height together with the beam immediately below the predetermined floor. .   In the beam replacement step, all the beams directly below the predetermined floor attached to the movable frame by a descending device, or all the beams immediately below the predetermined floor and the deck plate or composite floor plate installed on those beams are finally provided. The method for building a steel structure according to any one of claims 1 to 3, wherein the steel frame structure is lowered to the mounting height at the same time. The lowering device has a plurality of hydraulic jacks supported by the beam on the predetermined floor, a cable that can be rolled down by the hydraulic jack, and a plurality of pump units that control the hydraulic pressure of the hydraulic jack,
In the beam replacement step, all of the beams directly below the predetermined floor of the movable frame structure connected to the cable by centrally controlling the plurality of pump units with a control unit, or all the beams directly below the predetermined floor and The construction method for a steel structure according to claim 4, wherein the deck plate or the composite floor plate installed on the beams is lowered at the same time.   The steel frame structure construction method according to any one of claims 2 to 5, wherein the slope of the guide beam has a slope of 1/50 or more and 1/10 or less.   The construction method for a steel structure according to any one of claims 2 to 6, wherein the sliding material is made of monomer cast nylon.   In the frame moving step, the moving frame is slid by a predetermined span, and then the moving frame is temporarily fixed to the column of the independent column by a temporary fixing jig until the next frame moving step. A construction method for a steel structure according to any one of claims 2 to 7.   The construction method for a steel structure according to claim 8, wherein the temporary fixing jig includes a bar and a hydraulic clamp attached to both ends of the bar via a universal joint.   The steel structure according to claim 8 or 9, wherein, in the independent column installation step, the independent column is constructed after attaching one end of the temporary fixing jig to a beam joint bracket of the independent column. Construction method.