JPH062434A - Method of building steel structure roof - Google Patents

Abstract

PURPOSE:To remarkably shorten the construction period and to enhance the workability and a safety by enabling the assembly of a roof with steel structure trusses on the ground simultaneously with the construction of a lower structural body in a stable condition in which the horizontal thrust load of a steel truss is reduced. CONSTITUTION:Crosswise movable temporary masts 18 are supported on a crosswise shift rail 12 so as to assemble steel trusses 13. Further, assembled trusses 13 are crosswise shifted by a predetermined distance along the rail 12 together with the masts 18. Then, the steel trusses 13 are joined together. With the repetitions of the above-mentioned successive steps, a steel structure roof is assembled on the ground, and then, is lifted up together with the rail 12 and the masts 18, and then the rail 12 is crosswise moved, so as to set only the steel structure roof on a lower structural body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing a steel frame roof for constructing a large and heavy steel frame roof such as a dome shape.

[0002]

2. Description of the Related Art For example, in Japanese Unexamined Patent Publication No. 3-290550, a dome frame (dome-shaped roof) composed of a large number of arch-shaped steel trusses is installed on a substructure frame.
The erection pedestal is placed in the center of the erection range (center of the dome), and one or more steel trusses are erected between the erection pedestal and the lower structure frame from the end of the erection range, and the erected steel trusses are joined and erected. By sequentially rotating around the gantry, a large number of steel trusses are radially arranged to construct a lower layer dome frame (child roof), and then the steel truss at the end of the dome frame is used as a work stage. The construction method for constructing the dome frame (parent roof) of the upper layer by the same work procedure as the dome frame is described.

[0003]

However, this method has the following problems. The lower dome frame (child roof) is constructed on the gantry base and the lower structure frame, and the upper dome frame (parent roof) is constructed after the lower dome frame is constructed as a work stage. As for the construction period, the construction period for the lower structural frame and the construction period for the lower dome frame are added as they are, and the construction period for the upper dome frame is added to this, resulting in a very long overall construction period.

Regarding the construction of the upper dome frame (parent roof), the workability and economy are good because the lower dome frame (child roof) can be used as a work stage, but the construction of the lower dome frame is not possible. In the center of the range, that is, in the center of the dome, which has the highest height, a erection gantry with a height corresponding to the dome center height at the time of completion is built, and the lower framing unit is installed at a high position between this erection gantry and the substructure frame Due to the assembly, in addition to the high erection gantry, a plurality of work stages are required at a high place between it and the undercarriage skeleton, which increases the construction cost.

[0005] The divided parts of the steel frame truss (steel frame truss unit) must be lifted up by a crane on a high erection gantry and a work stage at a high place to assemble the steel frame truss, resulting in poor workability and danger due to work at a high place. It is expensive and requires a large crane.

[0006] The horizontal thrust load from the steel truss is dealt with by supporting each steel truss unit via rollers in each work stage. There is a risk of moving because of bearings, and since the assembly is originally at a high place, special consideration is required for work and equipment, and there is a problem that the risk is further increased.

It is an object of the present invention to assemble a roof with a steel truss in parallel with the construction of a substructure skeleton on the ground (so-called ground framing) and in a stable state in which the horizontal thrust load of the steel truss is reduced. , To significantly reduce the work period and improve workability and safety. Also,
A simple lift-up device enables a steel-framed roof to be lifted up to the upper part of the substructure in a stable state without the need for heavy equipment such as large cranes.

[0008]

According to the present invention, a steel truss assembling step of assembling each steel truss on the ground by supporting a horizontally movable temporary mast on a horizontally moving rail, and the assembled steel truss together with the temporary mast. After assembling the steel roof by sequentially repeating the lateral movement process of laterally moving along the lateral movement rail by a predetermined amount and the joining process of joining the steel trusses together, the steel roof is temporarily moved to the lateral movement rail and the temporary mast. At the same time, it is lifted up and laterally moved on the laterally moving rail, and only the steel frame roof is transposed and erected on the lower structure frame.

In the case of a curved steel truss, it is supported on the ground from below by a temporary mast at a point where the horizontal thrust loads on both the left and right parts are canceled by the reaction force due to its own weight or at two intermediate positions on the left and right. assemble.

As a preferable lift-up method, after the horizontal moving rails are supported on the left and right lifting yokes which are respectively moved up and down along the tower built on the ground to assemble the steel frame roof, a lifting yoke by a push-up jack is used. The lifting of the lifting yoke in a stepwise manner by alternately repeating the lifting of the lifting yoke by a predetermined stroke and the stacking of the pistons that support the load of the lifting yoke, thereby causing the steel roof to move laterally along with the rails for temporary movement and the temporary mast. Lift up to the height of.

In the case of a retractable roof, a steel frame roof assembled to the ground is installed on a trolley capable of traveling on the substructure frame.

It is preferable that the steel frame truss is laterally moved and lifted up in a state in which both ends thereof are connected by a wire or the like and the left and right horizontal thrust loads are offset each other.

[0013]

According to the present invention, the steel truss is supported on the temporary mast and assembled on the ground, and the assembled steel truss is laterally moved along the lateral movement rail together with the temporary mast while being supported by the temporary mast. The steel roof is erected by joining it with the steel truss constructed in the same way and repeating this. Therefore, all the assembling work of the steel frame roof can be done on the ground, and the building work of the lower structure skeleton can be done in parallel with the work. Then, the steel frame roof assembled to the ground is raised to the height of the lower structural frame by lifting up the horizontal movement rail while supporting it on the temporary mast, and the whole is horizontally moved along the horizontal movement rail to perform the horizontal movement. By transposing from the rails on the lower structural body, the entire steel roof can be installed on the lower structural body at once. The temporary mast may be removed at the time of reprinting or after reprinting.

When the steel truss is curved, a horizontal component force of the weight of the steel truss also acts on the left and right temporary masts. Then, each of the left and right component forces becomes a horizontal reaction force in the opposite direction to the steel truss, and the horizontal thrust load generated from the curved steel truss is canceled by the horizontal reaction force from the left and right temporary masts. Will be done.

Therefore, if the left and right support points of the steel truss by the left and right temporary masts are properly selected, the horizontal thrust load generated by the steel truss is determined by the horizontal reaction force acting as a reaction of the self weight of the steel truss to the temporary mast. Theoretically, it is possible to cancel, but it is possible to make it possible to leave only a very small horizontal thrust load even if it cannot be canceled completely.

Lifting up of the steel frame roof assembled in the ground is performed by alternately repeating lifting of the lifting yoke by a predetermined stroke by a push-up jack and stacking of pistons that support the load of the lifting yoke, and then lifting the lifting yoke along the tower. Since it is carried out stepwise, it can be safely and efficiently carried out in a stable state even if the steel roof is large and heavy.

[0017]

Embodiments of the present invention will now be described in detail with reference to the drawings. In the present embodiment, as shown in FIG. 1, for example, three types of steel roofs, that is, curved parallel roofs that open and close on the lower structural body 1 by moving back and forth on the lower structural body 1 on the lower structural body 1 In the construction of the open / close dome-shaped stadium provided with 2, a spherical rotary roof 3 that rotates and opens and closes, and a spherical fixed roof 4 fixed on the substructure body 1, a parallel roof (steel frame roof) 2 is provided. The case where it is installed on the lower structural body 1 will be described.

The parallel roof 2 is assembled on the ground and then laid on the left and right wall portions 5 of the lower structural body 1 so as to straddle it. FIG. 2 is a plan view showing the layout of the assembling work, and is a temporary structure for supporting the material stockyard 6 and the steel truss from a position far from the lower structure body 1 on the ground in front of or behind the lower structure body 1 being constructed. Temporary mast framing area 7 for framing the mast, left and right truss block framing areas 8 and 9 for framing truss blocks that are elements of the steel truss, steel truss framing, joining of steel trusses Move laterally to make a parallel roof 2
Secure a roof ground assembly area 10 for assembling.

In the roof ground assembly area 10, first, paired towers 11 are erected vertically on the ground (four pairs each on the left and right in the example of the figure) along the left and right parallel lines at the front and rear, respectively. Front and rear towers 11
The lateral movement rails 12 are installed horizontally between them as will be described later. Further, regarding the front and rear ends of the lateral movement rail 12, when the far side with respect to the lower structural body 1 is the starting end and the near side is the ending end, as shown in FIGS. 2 and 3 (front view), the steel truss 13 at the starting end. Since each set (1 span) is assembled into an arch shape, a pair of front and rear assembly vents 1 are provided on the ground at the center position between the starting ends of the left and right lateral movement rails 12, as shown in FIG.
Stand 4 vertically in close proximity. Further, a pair of front and rear mast pedestals 15 are provided on the left and right outside of the starting ends of the left and right lateral movement rails 12, and a pair of front and rear assembly auxiliary stands 16 are provided on the outer sides of the left and right sides thereof. A pair of front and rear lateral movement carriages 17 is installed on each of the movement rails 12. FIG. 17 is a schematic plan view showing the first such installation state.

As shown in FIG. 3, in the steel frame truss 13, a temporary mast 18 is erected on each laterally moving carriage 17 (see FIG. 18).
Shows the state at this time), and the left and right halves centering on the assembling vent 14 which is erected in the center are respectively supported by the left and right temporary masts 18 for assembly. That is,
Crane 19 (Fig. 5) is a truss block in which steel materials are assembled into a truss structure in the left and right truss block subassembly areas 8 and 9.
And the temporary mast 18 so that the left and right sides of the pair of front and rear assembly vents 14 (FIG. 6) and the right side can be crossed between the assembly vents 14 and the auxiliary stand 16 for assembly.
Then, the left and right intermediate portions are sequentially connected so as to be supported from below, and the one-span steel frame truss 13 is assembled in an arch shape. In this case, the assembly vent 14 and the assembly auxiliary stand 16
Is used as a temporary support only when the steel trusses 13 are assembled one by one. FIGS. 3, 4, 6, and 19 show the state at this time.

Each of the left and right temporary masts 18 is a main mast 18 which is vertically erected with its lower end supported on a horizontal carriage 17.
a, an inclined auxiliary mast 18b extending obliquely toward the assembly vent 14 side, and a horizontal auxiliary mast 18c extending horizontally from the carriage 17 toward the mast cradle 15, and these three masts 18a, 18b. The tip of 18c is pin-joined to the lower chord member of the steel truss 13 so that the load of the steel truss 15 is supported from below by the main mast 18a.

Therefore, the weight of the assembled steel frame truss 13 is mainly applied to the left and right main masts 18a at the intermediate portions of the left and right, and the main masts 18a are
Since the steel frame truss 13 has an arch shape, a horizontal component force also acts. Then, the respective left and right component forces act on the steel truss 13 in the opposite horizontal directions, and the horizontal thrust load generated from the steel truss 13 due to the arch shape is the horizontal reaction force from the main mast 18a. Only the force will be canceled.

Therefore, these left and right main masts 18a
If you select the right and left support points of the steel truss 18 by
The horizontal thrust load generated from the steel truss 13 can be theoretically offset by the horizontal reaction force acting as a reaction of the self-weight of the steel truss 13 against the main mast 18a, and it is a very small horizontal thrust even if it cannot be offset completely. It is possible to set only the load to remain, and the left and right supporting points are selected at positions where such a state can be designed.

By supporting the left and right temporary masts 18 in this manner, the steel frame trusses 13 retain only a slight horizontal thrust load, but the remaining horizontal thrust loads cancel each other out. Both ends are connected by a horizontal thrust load handling wire 20.
In this example, the wires 20 are stretched back and forth in parallel with each steel truss 13, and each wire 20 is tensioned by a tensioning device 21.

FIG. 7 shows an example of the tension device 21. This tensioning device 21 connects the left and right connecting tools 22 to the turnbuckle 23.
The left and right wires 20 are connected to the left and right connecting tools 22, respectively, the tips of these wires are connected to both ends of the steel truss 13, and the left and right wires 20 are turned by the turnbuckle 23. Moderately nervous.

8 to 10 show another example of the tensioning device 21. The tensioning device 21 comprises a hydraulic cylinder 24, a fixed collet chuck 25 fixed to the base end of the cylinder body 24a thereof, and a movable collet chuck 26 fixed to the tip of a hollow viston rod 24b. Then, the wire 20 in which the conical trapezoidal nodes 20a are continuously provided
The wire 20 is passed through the movable collet chuck 26, the hydraulic cylinder 24, and the fixed collet chuck 25 by using. In this tensioning device 21, the wire 20 is clamped by the fixed collet chuck 25, and the piston rod 24b
8 to FIG. 9, the wire 20 is clamped by the movable collet chuck 26, and then the piston 20 b is contracted as shown in FIG. 10 with the clamped fixed collet chuck 25 released. Is pulled toward the fixed collet chuck 25, and the wire 20 can be tensioned by repeating this.

The assembled arch-shaped steel truss 1
In order to assemble the next steel frame truss and to join it with the third frame 3, the horizontal moving carriage 17 is run along the horizontal moving rails 12, and the steel frame truss 13 is supported by the left and right erection masts 18 while the lower structural frame is being supported. It is laterally moved to the 1 side and removed from the assembling vent 14, the mast receiving base 15, and the assembling auxiliary base 16. In that case, the two wires 20 in front and rear are stretched in parallel on the steel truss 13 for horizontal thrust load handling as described above, and the center of the steel truss 13 is formed by a pair of front and rear assembly vents 14 at the time of assembly. Because it has been provisionally received,
When the steel truss 13 is laterally moved, the wire 20 interferes with the assembly vent 14. Therefore, in order to avoid this, the retracting operation of the assembling vent 14 is performed as follows.

As shown in FIGS. 5 and 11, the front and rear assembly vents 14 have a lateral V through which the front and rear wires 20 pass.
The wire trough 13 having a V shape is provided, and the steel truss 13 is provided.
Until the wire is moved laterally, the wire 20 is closed by the cover plate 28 so as not to come off from the wire penetrating recess 27. And
When moving laterally, open the lid plate 28 as shown in FIG.
The wire 20 is allowed to come out of the wire penetrating recess 27. At this time, the wire 20 is guided by the lid 28.

As shown in FIG. 5, front and rear assembly vents 1
Of the four, the one on the side of the lower structure body 1 is a winch 2 for movement.
By winding the moving wire 30 at 9, it is possible to move laterally back and forth on the rail 31 laid on the ground, and it is possible to lift it by removing it from the rail 31. So, this one side assembly vent 1
After moving 4 to the side of the lower structural frame 1 as shown in FIG. 13 until it comes off the steel truss 13, the assembly vent 14 is lifted by the crane 19 and the steel truss 13 is moved from that state to FIG. After laterally moving to a predetermined position as shown in FIG. 6, the assembling vent 14 is suspended and returned to the original position as shown in FIG.

When the assembled steel truss 13 is laterally moved in this manner, a joining truss 32 of a simple structure is subsequently assembled and installed as shown in FIG. 20, and the next steel truss 13 is the same as above. 17 and 18, the front and rear steel frame trusses 13 are joined to each other via the joining truss 32. Hereinafter, the same operation is repeated until the final assembly of the steel truss 13 is completed as shown in FIG.
Assemble the parallel roofs 2 that are sequentially joined via the.

The grounded parallel roof 2 is lifted up as a whole together with the left and right lateral movement rails 12, and as the device for lifting up, the following lift device is used in this example. This lift device is provided for each pair of towers 1 as shown in FIGS.
1 is provided.

In FIG. 26, each tower 11 is provided with an elevating plate 34 that ascends and descends along two climbing guide rails 33 that are also pillars, and a lifting yoke is provided between the elevating plates 34 of both towers 11 facing each other. Three
5 is installed. Then, as shown in FIG. 25, the left lateral movement rail 12 is placed on the lifting yokes 35 of the plurality of pairs of towers 11 arranged at the front and rear on the left side, and the right lateral movement rail 12 is It is mounted on the lifting yokes 35 of the plurality of pairs of towers 11 arranged at the front and rear on the right side.

As shown in FIG. 26, each climbing guide rail 33 is provided with a push-up jack 36 at its lower end, and a piston supply guide base 37 and a lock plate guide rail 38 beside it. Piston supply guide 37
Guides the separated pistons 39 one by one into the climbing guide rail 33. On the piston supply guide base 37, a plurality of pistons 39 can be set in a line in advance. Has become. The lock plate guide rail 38 guides a separately prepared lock plate 40 into and out of the climbing guide rail 33.

The lifting yoke 35 is lifted up by simultaneously performing the following operations in the towers 11 facing each other. As shown in FIG. 27, at the first stage, the lift head 41 of the push-up jack 36 descends on each climbing guide rail 33, and the lock plate 40 is pulled out from the inside of the climbing guide rail 33. In this state, one piston 39 is inserted into the climbing guide rail 33 and placed on the lift head 41.

The push-up jack 36 extends, the lift head 41 moves up by a predetermined stroke, and the lifting plate 34 is pushed up via the piston 39, so that the lifting yoke 35 is lifted up by one step. Then, after the lock plate 40 is inserted into the climbing guide rail 33 as shown in FIG. 28, the push-up jack 36 contracts and the lift head 41 is lowered as shown in FIG. The load is supported by the lock plate 40 via the piston 39.

Next, as shown in FIG. 30, a new piston 39 is inserted into the climbing guide rail 33, and then the lock plate 40 is moved to the climbing guide rail 3.
After being pulled out from inside 3, the lifting jack 36 extends again and the lift head 41 moves up by a predetermined stroke, so that the lifting yoke 35 is further lifted up by one step. Hereinafter, by repeating such an operation and stacking the pistons 39 one by one, the lifting yoke 35 can be lifted up by one step.

Therefore, if the framing of the parallel roof 2 is completed as described above (FIG. 21), the towers 11 arranged on the left, right, front and rear are added up to the required height as shown in FIG. 31, and then the entire lifting is performed. The yoke 35 is lifted up one step at a time by the above operation, and the grounded parallel roof 2 is moved up to the height of the left and right wall portions 5 of the lower structural body 1 together with the left and right lateral movement rails 12 as shown in FIG. Lift up. On the other hand, on the side of the lower structural body 1, a bogie trolley 42 as shown in FIG.

Next, the parallel roof 2 is laterally moved to the side of the lower structural frame 1 along the left and right lateral movement rails 12, and as shown in FIG. In the state of being positioned, both ends of the steel truss 13 at the tip are connected to the left and right bogie carriages 42. Next, as shown in FIG. 23, the steel frame truss 1 that has completed the connection with the bogie truck 42.
After removing the temporary masts 18 on the left and right of 3, the parallel roof 2
Is further advanced along the left and right lateral movement rails 12 on the left and right wall portions 5, and the same work is repeated to install the entire parallel roof 2 between the left and right wall portions 5 so as to be movable in parallel. To do. The horizontal thrust load handling wire 20 may be removed at the same time as the removal of the left and right erection masts 18, or before or after that.

34 and 35 show another embodiment. In this case, the arch-shaped steel truss 13 is assembled by directly supporting the left and right ends on the lateral movement carriage 17 without using the temporary mast 18 as in the above-described example. Then, the assembled steel truss 13 is laterally moved along the lateral movement rails 12 at the left and right ends to assemble the next steel truss 13, the steel trusses 13 are joined to each other, and this is repeated to form the dome-shaped steel roof 2a. To ground. After that, the lifting yoke 35 supporting the lateral movement rail 12 is pushed up one step at a time in the same manner as described above, and the steel frame roof 2
After a is lifted up to the height of the lower structure frame (not shown) together with the left and right lateral movement rails 12, the steel frame roof 2a is laterally moved along these left and right lateral movement rails 12 so that it is on the lower structure frame. Reprinted to.

[0040]

The present invention has the following effects. All the assembly work of the steel frame roof can be done on the ground, and the construction work of the lower structural frame can be done in parallel with the work, so the construction period can be greatly shortened.

After the steel frame roof is erected, it is lifted up and installed on the substructure frame, so that a work stage for working at high places, a large crane, etc. are not required, and the work cost can be reduced and the workability is good.

Since each steel frame truss is assembled and lifted up while being supported by the temporary mast, the horizontal thrust load can be reduced, the horizontal thrust load processing device can be simplified, and the steel roof can be grounded with less danger. And it can be installed on the substructure frame. It is even more preferable to assemble and lift up the steel frame truss with the temporary mast supporting the horizontal thrust load at two intermediate positions at or near the point where the horizontal thrust load is canceled by the reaction force due to its own weight.

The lift-up of the steel frame roof assembled to the ground is alternately repeated by pushing up the lifting yoke by a predetermined stroke by the push-up jack and stacking the pistons that support the load of the lifting yoke, and the lifting yoke is moved along the tower. If it is raised step by step, it can be safely and efficiently performed in a stable state even if the steel roof is large and heavy.

[Brief description of drawings]

FIG. 1 is a perspective view of an open / close dome-shaped stadium showing an application example of the method of the present invention.

FIG. 2 is a schematic plan view of an example of a work layout for implementing the method of the present invention.

FIG. 3 is a front view showing an assembly mode of a steel frame truss in the method of the present invention.

FIG. 4 is a side view of the same.

FIG. 5 is an enlarged side view of the above.

6 is a front view showing, on an enlarged scale, only the left half of FIG.

FIG. 7 is a front view of an example of a tensioning device for tensioning the horizontal thrust processing wire.

FIG. 8 is a schematic sectional view of another example of the tensioning device.

FIG. 9 is a schematic cross-sectional view of an extension operation state of the tension device.

FIG. 10 is a schematic cross-sectional view of the tensioning device in a contracting operation state.

FIG. 11 is a cross-sectional view showing a part of the pair of front and rear assembly vents for temporarily receiving the center of the steel frame truss, through which the horizontal thrust processing wire is passed.

FIG. 12 is a cross-sectional view of the same as above with the cover plate open.

FIG. 13 is a side view showing a state in which one of the assembly vents is retracted in order to laterally move the assembled steel truss by a predetermined amount.

FIG. 14 is a side view showing a state in which the steel frame truss is laterally moved.

FIG. 15 is a side view showing a state in which the lateral movement of the steel frame truss is completed.

FIG. 16 is a side view of the retracted assembly vent returned to its original position.

17 to 24 sequentially show the work steps of the method of the present invention, and FIG. 17 is a schematic plan view of the first installation step.

FIG. 18 is a schematic plan view of a temporary mast installation process.

FIG. 19 is a schematic plan view of a steel frame truss assembly process.

FIG. 20 is a schematic plan view of a steel truss joining process.

FIG. 21 is a schematic plan view of a final grounding process for a parallel roof using a steel truss.

FIG. 22 is a schematic plan view of a process of lifting up a parallel roof that has been erected and installing it on a lower structure skeleton.

FIG. 23 is a schematic plan view of a temporary mast removing step.

FIG. 24 is a schematic plan view of the installation completion state of the parallel roof.

FIG. 25 is a front view of a tower for performing the lift-up and a lift-up device equipped therein.

FIG. 26 is a perspective view of the above.

FIG. 27 is a perspective view showing a first stage of a lift-up operation of the lift-up device.

FIG. 28 is a perspective view of a second stage of the above.

FIG. 29 is likewise a perspective view of the third stage.

FIG. 30 is a perspective view of the same for the fourth stage.

FIG. 31 is a front view of a state where the parallel roof made of steel truss is lifted up by adding the tower.

FIG. 32 is a front view showing a state in which the lift-up is completed.

FIG. 33 is a schematic cross-sectional view of a bogie trolley for traveling a parallel roof on a lower structure skeleton.

FIG. 34 is a front view showing another embodiment.

FIG. 35 is a side view of the above.

[Explanation of symbols]

 1 Substructure frame 2 Parallel roof (steel frame roof) 11 Tower 12 Rail for lateral movement 13 Steel truss 18 Temporary mast 20 Horizontal thrust load handling wire 35 Lifting yoke 36 Push-up jack 39 Piston 42 Bogie truck

Claims (5)

[Claims] 1. A steel frame truss assembling step of assembling each steel frame truss on the ground by supporting a temporary mast capable of lateral movement on a lateral movement rail, and the assembled steel truss along with the temporary mast along the lateral movement rail. After constructing a steel frame roof by sequentially repeating the horizontal movement process of moving a fixed amount laterally and the joining process of joining steel trusses together, the steel roof is lifted up together with the horizontal movement rail and the temporary mast, and the horizontal movement is performed. A method for constructing a steel-framed roof, wherein the steel-framed roof is transposed and erected on a substructure frame by laterally moving on a rail for construction. 2. The ground is supported by the temporary mast from below at each of the curved steel trusses at the intermediate left and right two positions at or near the point where the horizontal thrust loads of the left and right parts are offset by the reaction force due to its own weight. The method for constructing a steel frame roof according to claim 1, wherein the method is used for assembling. 3. The horizontal moving rails are supported on left and right lifting yokes which ascend and descend along a tower built on the ground to assemble the steel frame roof, and then a predetermined stroke of the lifting yoke by a push-up jack. By alternately repeating pushing up and stacking pistons that support the load of the lifting yoke to raise the lifting yoke stepwise, the steel roof is lifted up to the height of the lower structure frame together with the lateral movement rail and the temporary mast. The method of constructing a steel frame roof according to claim 1 or 2, wherein 4. The method of constructing a steel frame roof according to claim 1, wherein the steel frame roof assembled to the ground is transposed on a trolley capable of traveling on the lower structure frame. Method. 5. The steel frame according to claim 1, wherein both ends of the steel frame truss are connected with a wire or the like to laterally move and lift up in a state where left and right horizontal thrust loads are offset from each other. How to build a roof.