Method of constructing a roof steel frame

Abstract

Provided is a construction method of a roof steel frame and the like that enables safe and easy installation of equipment in the ceiling part. 【Solution means】When constructing a roof steel frame 4 in which adjacent steel beams 40 in plan view are connected by a connecting member 451 or the like, a step of installing a subsequent steel beam 40 next to a previously erected steel beam 40, a step of connecting adjacent steel beams 40 by some connecting members 451 or the like, lifting an equipment unit including equipment 7 in the ceiling part with a crane, arranging it between adjacent steel beams 40 while avoiding interference with some connecting members 451 or the like, attaching the equipment unit between adjacent steel beams 40, and installing another connecting member 451 between adjacent steel beams 40 are carried out.

Description

Technical Field

[0001] The present invention relates to a method for constructing a roof steel frame and the like.

Background Art

[0002] The ceiling of an arena structure often has a structure in which a roofing material is supported by a roof steel frame such as a truss. In the ceiling of an arena structure, in addition to the roof steel frame and the roofing material, facilities such as air conditioning, electricity, and water supply and drainage are also provided to accommodate a large number of spectators and various production equipment (for example, Patent Document 1).

[0003] When installing these facilities, for example, a temporary scaffold (general scaffold, partial scaffold, or suspended scaffold, etc.) is assembled in the arena space under the completed roof steel frame, and after the facility work is carried out using the scaffold, the scaffold is disassembled. Patent Document 1 also describes that a truss unit having a plurality of trusses constituting the roof steel frame and equipment is assembled on the ground, lifted by a winch, and installed on the ceiling.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In an arena structure, there is a large amount of facility work at the ceiling level, and there are problems such as a shortage of labor for facility constructors. In view of this, a method that can perform facility work safely and easily is desired, and how to construct the steel frame construction in a large space and a large amount of facility work becomes the key point of the construction plan.

[0006] For example, when assembling a temporary scaffold for construction work as described above, the construction of the scaffold and the amount of difficult construction work carried out on the scaffold become enormous, and there is concern about the tight schedule. Also, in the method of Patent Document 1, the truss unit including a plurality of trusses and equipment becomes large-scale, and a large-scale mechanism is required to lift it.

[0007] The present invention has been made in view of the above problems, and an object thereof is to provide a construction method of a roof steel frame capable of safely and easily installing equipment on the ceiling portion.

Means for Solving the Problems

[0008] The present invention for solving the above problems, when constructing a roof steel frame in which adjacent steel beams are connected by connecting members in a plan view, includes a step of installing a subsequent steel beam adjacent to the previously erected steel beam, a step of connecting adjacent steel beams with some of the connecting members, a step of lifting an equipment unit including ceiling equipment with a crane and arranging it between adjacent steel beams while avoiding interference with some of the connecting members, and a step of installing the equipment unit between adjacent steel beams, and a step of installing another connecting member between adjacent steel beams. It is a construction method of a roof steel frame characterized by implementing.

[0009] In the present invention, during the construction of the roof steel frame, by lifting the equipment unit with a crane and installing it between adjacent steel beams, the installation of the equipment becomes easy, there is no need to provide a large-scale scaffold such as a general scaffold, leading to a shortening of the construction period and a reduction in construction costs. Also, the work at heights can be reduced, improving productivity and safety. Furthermore, since the equipment unit and the steel beam are installed separately, construction can be carried out with a normal crane, and a large-scale mechanism is not required.

[0010] In the present invention, the structural performance of the roof steel frame is improved by connecting adjacent steel frames with connecting members. During the construction of the roof steel frame, some connecting members are installed in advance, and the previously erected steel frame and the subsequent steel frame are connected to prevent the subsequent steel frame from tipping over. In addition, since only some of the connecting members that do not interfere with the equipment unit can be installed in advance, interference between the equipment unit installed later using a crane and the connecting members can be prevented.

[0011] The equipment unit includes, for example, the equipment and attached steel frames, and the attached steel frames are joined to the steel frame or the connecting members. The equipment unit is configured to include attached steel frames joined to steel frames or the like, so that the installation of the equipment unit becomes easy.

[0012] It is desirable that the steel frame be fabricated by assembling it upright using a gantry without laying it down, and then lifted and installed by a crane. This leads to a reduction in space by minimizing the yard for fabricating the steel frame, and the number of construction heavy machines such as cranes can be increased. In addition, the work of erecting the steel frame with a crane or the like becomes unnecessary. Therefore, the construction period can be shortened, and the disaster risk during the erection of the steel frame can be eliminated.

[0013] It is desirable that the steel frame be supported by a girder receiving member from a temporary vent, and after the construction of the roof steel frame, the load be transferred from the girder receiving member to a jack, and the vent be removed by jacking down. The steel frame can be supported by a girder receiving member from a vent, for example, and erected at a high place. The vent can be removed after transferring the load from the girder receiving member to a jack and performing jacking down of the roof steel frame.

[0014] The steel frame beam is a truss-shaped member having an upper chord member, a lower chord member, a bundled member provided vertically between the upper chord member and the lower chord member, and a diagonal member provided obliquely with respect to the vertical direction between the upper chord member and the lower chord member. The connecting member connects the upper chord members of adjacent steel frame beams and the lower chord members of adjacent steel frame beams. By using the steel frame beam as a truss, high rigidity can be achieved with a small amount of steel. In this case, the connecting member is provided to connect the upper chord members and the lower chord members of the steel frame beams.

Advantages of the Invention

[0015] The present invention can provide a construction method of a roof steel frame and the like capable of safely and easily installing the equipment in the ceiling part.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Embodiments for Carrying Out the Invention

[0017] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

[0018] (1. Arena Structure 1) FIG. 1 is a diagram showing an overview of an arena structure 1 in which a roof steel frame 4 is constructed by the construction method according to an embodiment of the present invention. The arena structure 1 is provided with spectator seats 2 so as to surround a column-free arena space S, and a roof steel frame 4 is spanned between outer peripheral steel frames 3 provided around the spectator seats 2, and a roof material 5 such as a folded plate roof is supported by the roof steel frame 4. The roof steel frame 4 and the roof material 5 constitute the ceiling portion of the arena structure 1, and various facilities 7 are also provided in the ceiling portion. The facilities 7 are, for example, ducts, cable racks, distribution boards, lighting, etc. to be described later, but are not particularly limited.

[0019] The roof steel frame 4 has steel beams 40. The steel beam 40 is a truss-shaped member having an upper chord member 41, a lower chord member 42, diagonal members 43, and bundled members 44. The diagonal members 43 are provided obliquely with respect to the vertical direction between the upper chord member 41 and the lower chord member 42, and the bundled members 44 are provided in the vertical direction between the upper chord member 41 and the lower chord member 42. The bundled members 44 are arranged at intervals in the span direction of the steel beam 40. The span direction of the steel beam 40 corresponds to the left-right direction in FIG. 1. The diagonal members 43 are arranged between the bundled members 44 adjacent to each other in the span direction, and both ends of the diagonal members 43 are joined to the upper chord member 41 and the lower chord member 42 of the steel beam 40 at the same positions as the bundled members 44 on both sides of the diagonal members 43.

[0020] Further, the roof steel frame 4 is divided in the span direction of the steel beam 40 into an end portion 4-1 on the outer peripheral steel frame 3 side and a central portion 4-2 between both end portions 4-1.

[0021] FIG. 2 is a diagram showing a plan view of the roof steel frame 4 with a part of the roof material 5 of the arena structure 1 omitted. As shown in FIG. 2, a plurality of steel beams 40 are arranged at intervals in the direction orthogonal to the span of the steel beam 40, and the steel beams 40 adjacent to each other in the direction orthogonal to the span are connected by the upper chord steel frame 45 including a connecting member described later and the lower chord steel frame. The direction orthogonal to the span of the steel beam 40 is a direction orthogonal to the span direction of the steel beam 40 in a plane and corresponds to the vertical direction in FIG. 2. The upper chord steel frame 45 and the lower chord steel frame will be described later.

[0022] (2. Construction method of the roof steel frame 4) The roof steel frame 4 is divided into an end portion 4-1 and a central portion 4-2 in the span direction of the steel beam 40 and is constructed by division. Hereinafter, the construction method, particularly the construction procedure of the end portion 4-1, will be described.

[0023] The construction of the roof steel frame 4 is started after at least the construction of the outer peripheral steel frame 3 and before the construction of the roof material 5. As shown in FIG. 3(a), a temporary vent 8 is erected in the arena space S, and a support portion 81 for the steel beam 40 is provided at the top thereof. One end of the steel beam 40 of the end portion 4-1 is supported by the support portion 81 and the other end is joined to the outer peripheral steel frame 3 for installation. In FIG. 1, the position where the vent 8 is provided is indicated by a chain line.

[0024] The support at the support portion 81 is performed by supporting a spacer member 813 provided on the lower surface of the steel beam 40 with a girder receiving fitting (girder receiving member) 812 provided at the top of the vent 8 as shown in FIG. 5(a). The reference numeral 811 in FIG. 5(a) is a jack used in a later process.

[0025] From this state, a new steel beam 40 is lifted from the ground yard or the like by a crane (not shown) and installed adjacent to the previously erected steel beam 40 in the direction orthogonal to the span in the same manner as described above as shown in FIG. 3(b).

[0026] The steel beam 40 is assembled on the ground (within the arena space S) in the yard. Fig. 6(a) is a diagram showing an overview of the gantry 100 used for assembling the steel beam 40 on the ground. The gantry 100 has a pair of support parts 102 erected at the central part of the girder part 101, and arm parts 103 protruding from the support parts 102 to both sides at the top ends of the support parts 102, and has an overall U-shaped configuration. The gantry 100 is formed of a steel structure material such as an H-shaped steel.

[0027] As shown in Fig. 6(b), in the yard on the ground, a plurality of gantries 100 are arranged at intervals. The lower chord member 42 is installed on the girder part 101 etc. of these gantries 100, and the lower ends of the diagonal members 43 and the bundled members 44 are fixed to the lower chord member 42. Then, the upper chord member 41 is fixed to the upper ends of the diagonal members 43 and the bundled members 44. The upper chord member 41 can be supported by being spanned over the arm parts 103 of each gantry 100. On the arm parts 103, height adjustment blocks 104 are arranged as necessary, and the upper chord member 41 is placed on the blocks 104. Temporary scaffolds 110 are installed between the gantries 100 and outside the gantries 100 at both ends, and the steel beam 40 is erected from above the temporary scaffolds 110.

[0028] In this way, the steel beam 40 can be manufactured in a state where it is erected without being laid down by using the gantry 100. Therefore, the yard for manufacturing the steel beam 40 can be minimized, leading to a reduction in space, and the number of construction heavy machines such as cranes that can be installed can be increased. Also, the work of erecting the steel beam 40 with a crane etc. becomes unnecessary. Thereby, the construction period can be shortened, and the disaster risk during the erection of the steel beam 40 can be eliminated. Furthermore, since the gantry 100 in Fig. 6(a) can manufacture two steel beams 40 in parallel on both sides of the support part 102, a further shortening of the construction period can be expected.

[0029] After thus forming and installing the framework of the new steel girder 40, as shown in Fig. 3(c), the previously installed steel girder 40 and the new steel girder 40 (hereinafter referred to as the subsequent steel girder 40) are connected by connecting members 451 and 461 in the span orthogonal direction. Steel structural materials such as H-shaped steel are used for the connecting members 451 and 461. The connecting member 451 connects the upper chord members 41 of both steel girders 40 at a position where they abut against the upper end portions of some bundling members 44, and the connecting member 461 connects the lower chord members 42 of both steel girders 40 at a position where they abut against the lower end portions of some bundling members 44.

[0030] By thus connecting the steel girders 40 with the connecting members 451 and 461, the lateral collapse of the subsequent steel girder 40 can be prevented. Thereafter, by releasing the crane suspension support of the subsequent steel girder 40, interference between the equipment unit to be installed in the subsequent process and the crane can be prevented. The number and arrangement of the connecting members 451 can be planned in advance in consideration of preventing the lateral collapse of the steel girder 40 and preventing interference with the equipment unit to be installed in the subsequent process. The number and arrangement of the connecting members 461 can also be planned in advance in consideration of preventing the lateral collapse of the steel girder 40 and the like.

[0031] Between the previously installed steel girder 40 and the subsequent steel girder 40, as shown in Fig. 3(d), another connecting member 461 for connecting the lower chord members 42 to each other is further installed. Including the previously installed connecting member 461, each connecting member 461 connects the lower chord members 42 of both steel girders 40 at a position where they abut against the lower end portions of each bundling member 44. These connecting members 461 constitute the lower chord steel structure of the main installation for connecting the lower chord members 42 of both steel girders 40.

[0032] In this embodiment, next, as shown in Fig. 4(a), an equipment unit including equipment 7 and auxiliary steel structure is attached between the previously installed steel girder 40 and the subsequent steel girder 40. The equipment unit is assembled on the ground yard and lifted by a crane (not shown) using a suspension scale or the like. Then, it is lowered and arranged between the two steel girders 40, avoiding the connecting member 451, from above the steel girder 40.

[0033] FIG. 7 is a diagram showing an outline of a grape trellis unit 10 which is an example of an equipment unit. FIG. 7(a) is a diagram showing the upper surface of the grape trellis unit 10, and FIG. 7(b) is a diagram showing the side surface of the grape trellis unit 10.

[0034] In the example of FIG. 7, as the equipment 7, ducts 71a, 71b and a cable rack 72 are provided, and the ducts 71a and the cable rack 72 are installed on the support member 11. Further, the support member 11 is supported by a suspension member 13 hanging down from the grape trellis 12.

[0035] The grape trellis 12 is an accessory steel frame having a ladder-shaped plane in which a pair of beam members 121 arranged in parallel are connected by a connecting member 122. Steel frame materials such as H-shaped steel are used for the beam members 121 and the connecting members 122. The beam members 121 are arranged along the longitudinal direction of the grape trellis 12, and the connecting members 122 are arranged along the width direction of the grape trellis 12. A plurality of connecting members 122 are provided at intervals along the longitudinal direction of the grape trellis 12. The longitudinal direction of the grape trellis 12 corresponds to the left-right direction in FIGS. 7(a) and 7(b). The width direction of the grape trellis 12 is a direction orthogonal to the longitudinal direction of the grape trellis 12 in a plane, and corresponds to the up-down direction in FIG. 7(a) and the direction normal to the paper surface in FIG. 7(b).

[0036] The support member 11 is arranged along the width direction of the grape trellis 12, and both ends thereof are suspended and supported by the suspension member 13. The upper end portion of the suspension member 13 is attached to the beam members 121 on both sides of the grape trellis 12. A plurality of support members 11 and suspension members 13 are provided at intervals along the longitudinal direction of the grape trellis 12. The grape trellis 12 can be used not only as a suspension for ducts 71a etc., but also as a receiving member for placing equipment 7 such as ducts 71b etc. on the upper part.

[0037] The grape trellis unit 10 is arranged between a previously erected steel frame beam 40 and a subsequent steel frame beam 40 with the longitudinal direction of the grape trellis 12 as the direction orthogonal to the span or the span direction. By joining both end portions in the longitudinal direction of the grape trellis 12 to a joining plate (not shown) such as a gusset plate protruding from the bundled material 44 of the steel frame beam 40 etc. with bolts etc., the grape trellis unit 10 is attached between both steel frame beams 40.

[0038] FIG. 8 is a diagram showing an outline of a duct unit 10a which is another example of the equipment unit. FIG. 8(a) is a diagram showing the upper surface of the duct unit 10a, and FIG. 8(b) is a diagram showing the side surface of the duct unit 10a.

[0039] In the example of FIG. 8, a duct 73 is provided as the equipment 7, and the duct 73 is installed on a duct receiving member 14 which is a supplementary steel frame. The duct receiving member 14 has a ladder-shaped plane in which a pair of beam members 141 arranged in parallel are connected by a connecting member 142, and is formed of a steel frame material such as a channel steel.

[0040] The beam members 141 are arranged along the longitudinal direction of the duct receiving member 14, and the connecting members 142 are arranged along the width direction of the duct receiving member 14. A plurality of connecting members 142 are provided at intervals along the longitudinal direction of the duct receiving member 14. The longitudinal direction of the duct receiving member 14 corresponds to the left-right direction in FIGS. 8(a) and 8(b). The width direction of the duct receiving member 14 is a direction orthogonal to the longitudinal direction of the duct receiving member 14 in a plane, and corresponds to the up-down direction in FIG. 8(a) and the direction normal to the paper surface in FIG. 8(b).

[0041] The duct 73 is arranged with its axial direction aligned with the longitudinal direction of the duct receiving member 14. FIG. 9 is a diagram showing a cross section (hereinafter simply referred to as a cross section) orthogonal to the axial direction of the duct 73. The duct 73 has a structure in which a heat insulating material 732 such as a heat insulating material is provided outside a cylindrical duct main body 731 having a rectangular cross section. The heat insulating material 732 has fire resistance and moisture resistance (water resistance).

[0042] As shown in FIG. 8, a fixing mechanism 15 for fixing the duct 73 is provided on the duct receiving member 14. The fixing mechanism 15 has a vertical member 151 extending upward from the beam members 141 on both sides of the duct receiving member 14 and a horizontal member 152 arranged along the upper surface of the duct 73. The horizontal member 152 is arranged along the width direction of the duct receiving member 14, and the upper end portions of the vertical members 151 on both sides of the duct receiving member 14 are attached to both ends thereof. A plurality of fixing mechanisms 15 are arranged at intervals along the longitudinal direction of the duct receiving member 14.

[0043] The duct unit 10a is arranged between the previously erected steel girder 40 and the subsequent steel girder 40 with the longitudinal direction of the duct support member 14 being the direction perpendicular to the span or the span direction. By joining both longitudinal ends of the duct support member 14 to a joining plate (not shown) such as a gusset plate provided on the lower chord member 42 or the connecting member 461 of the steel girder 40 with bolts or the like, the duct unit 10a is attached between the two steel girders 40. Note that the duct support member 14 may also be joined to a joining plate provided on the upper chord member 41, the diagonal member 43, or the bundled member 44 of the steel girder 40.

[0044] Figure 10 is a diagram showing an outline of a catwalk unit 10b which is yet another example of the equipment unit. Figure 10(a) is a diagram showing the upper surface of the catwalk unit 10b, and Figure 10(b) is a diagram showing the side surface of the catwalk unit 10b.

[0045] In the example of Figure 10, a distribution board 74 and a cable rack 75 are provided as the equipment 7, and the distribution board 74 and the cable rack 75 are supported by a steel frame 16 which is an auxiliary steel structure. The steel frame 16 has a ladder-shaped plane in which a pair of beam members 161 arranged in parallel are connected by a connecting member 162, and is formed of a steel structure material such as an H-shaped steel.

[0046] The beam members 161 are arranged along the longitudinal direction of the steel frame 16, and the connecting members 162 are arranged along the width direction of the steel frame 16. A plurality of connecting members 162 are provided at intervals along the longitudinal direction of the steel frame 16. The longitudinal direction of the steel frame 16 corresponds to the left-right direction in Figures 10(a) and (b). The width direction of the steel frame 16 is a direction perpendicular to the longitudinal direction of the steel frame 16 in the plane, and corresponds to the up-down direction in Figure 10(a) and the direction normal to the paper surface in Figure 10(b).

[0047] On the connecting member 162 of the steel frame 16, a metal floor plate 163 used as a catwalk is provided. The distribution board 74 is arranged on the floor plate 163. The cable rack 75 is supported by a support mechanism 17 provided on the steel frame 16. The support mechanism 17 has vertical members 171 extending upward from the beam members 161 on both sides of the steel frame 16 and horizontal members 172 arranged along the width direction of the steel frame 16, and the upper end portions of the vertical members 171 on both sides of the steel frame 16 are attached to both ends of the horizontal member 172. A plurality of support mechanisms 17 are arranged at intervals in the longitudinal direction of the steel frame 16.

[0048] The cable rack 75 is arranged on the horizontal member 172 with its longitudinal direction aligned with the longitudinal direction of the steel frame 16. Also, handrails 164 and the like are provided on the beam members 161 on both sides of the steel frame 16. In addition, facilities 7 such as underfloor wiring, lighting, and sensors for the distribution board 74 can be provided in the catwalk unit 10b.

[0049] The catwalk unit 10b has the longitudinal direction of the steel frame 16 as the span orthogonal direction or the span direction and is arranged between the previously erected steel beam 40 and the subsequent steel beam 40. By joining both end portions in the longitudinal direction of the steel frame 16 to a joint plate (not shown) such as a gusset plate provided on the lower chord member 42 or the connecting member 461 of the steel beam 40 with bolts or the like, the catwalk unit 10b is attached between the two steel beams 40.

[0050] Although omitted in Fig. 4(a), between the previously erected steel beam 40 and the subsequent steel beam 40, in addition to the equipment unit, a free access ceiling (flexible ceiling) may be provided at a height corresponding to the lower chord member 42. As schematically shown in Fig. 11, the free access ceiling 9 is a ceiling material in which a wire mesh 91 is attached to a steel frame 92. A plurality of free access ceilings 9 are lifted collectively by a crane and joined to a joint plate (not shown) such as a gusset plate provided on the lower chord member 42 or the connecting member 461 of the steel beam 40 with bolts or the like, so that the free access ceiling 9 can be attached between the two steel beams 40.

[0051] The equipment units and the access floor 9 are installed in order from those to be installed at a lower position. For example, the access floor 9 and the catwalk unit 10b are installed first, and the grape trellis unit 10 is installed later.

[0052] After installing the equipment units and the like in this way, as shown in FIG. 4(b), another connecting member 451 that connects the upper chord members 41 of the previously erected steel frame beam 40 and the subsequent steel frame beam 40, and a diagonal member 452 are installed.

[0053] Including the previously installed connecting member 451, each connecting member 451 connects the upper chord members 41 of both steel frame beams 40 at a position hitting the upper end portions of the respective bundled members 44. The diagonal member 452 is provided obliquely with respect to the span orthogonal direction between the connecting members 451 adjacent in the span direction. Both end portions of the diagonal member 452 are joined to the upper chord members 41 of both steel frame beams 40 at the same position as the connecting members 451 on both sides of the diagonal member 452. The connecting member 451 and the diagonal member 452 constitute the upper chord steel frame 45 of this facility that connects the upper chord members 41 of both steel frame beams 40.

[0054] After that, as shown in FIG. 4(c), a new steel frame beam 40 is arranged next to the subsequent steel frame beam 40 in the direction orthogonal to the span in the same manner as in FIG. 3(b). Hereinafter, by reading the subsequent steel frame beam 40 as the previously erected steel frame beam 40 and repeating the steps in FIGS. 3(c) to 4(c), the steel frame beam 40, the upper chord steel frame 45, the lower chord steel frame, etc. at the end portion 4-1 of the roof steel frame 4 are constructed. Also, at an appropriate timing during the process, a diagonal member (not shown) that connects the upper and lower connecting members 451 and 461 can be provided. The diagonal member, the upper and lower connecting members 451 and 461, and the bundled member 44 constitute the steel frame beam of this facility orthogonal to the steel frame beam 40.

[0055] The steel frame beam 40 etc. at the central portion 4-2 of the roof steel frame 4 can also be installed in the same procedure, and the equipment units and the access floor 9 are also installed in the same manner as above. However, since both end portions in the span direction of the steel frame beam 40 at the central portion 4-2 can be joined to the steel frame beam 40 at both end portions 4-1 of the roof steel frame 4 with bolts or the like, as shown in FIG. 1, vents 8 etc. that directly support the steel frame beam 40 at the central portion 4-2 are not particularly necessary.

[0056] By installing the steel beams 40 at both ends 4-1 and the central part 4-2 of the roof steel frame 4, and the upper chord steel frame 45 and the lower chord steel frame between the steel beams 40, the construction of the roof steel frame 4 is completed. Also, by jacking down the roof steel frame 4 at the support part 81 and performing the construction of the roof base (not shown) and the roofing material 5, the ceiling part of the arena structure 1 is formed. The vent 8 and the accompanying support part 81 can be removed after jacking down the roof steel frame 4.

[0057] As shown in Fig. 5(a), the jacking down is performed as follows: from the state where the steel beam 40 is supported by the girder bearing fitting 812, as shown in Fig. 5(b), the jack 811 is extended to transfer the load of the steel beam 40 from the girder bearing fitting 812 to the jack 811, and as shown in Fig. 5(c), while pulling out the girder bearing fitting 812 from the top, the jack 811 is gradually contracted.

[0058] As described above, in this embodiment, during the construction of the roof steel frame 4, by lifting the equipment unit with a crane and installing it between adjacent steel beams 40, the installation of the equipment 7 becomes easy, eliminating the need for a large-scale scaffolding such as a general scaffolding, leading to a reduction in the construction period and construction costs. Also, the work at heights can be reduced, improving productivity and safety. Furthermore, since the equipment unit and the steel beam 40 are installed separately, construction can be carried out with an ordinary crane, eliminating the need for a large-scale mechanism.

[0059] Also, in this embodiment, by connecting adjacent steel beams 40 with the upper chord steel frame 45 including the connecting member 451, etc., the structural performance of the roof steel frame 4 is improved. During the construction of the roof steel frame 4, by pre-installing some connecting members 451, etc. and connecting the previously erected steel beam 40 and the subsequent steel beam 40, the lateral collapse of the subsequent steel beam 40 can be prevented. Also, at this stage, the crane suspension support of the subsequent steel beam 40 can be released, preventing interference with the crane during the installation of the equipment unit.

[0060] Moreover, since not all of the connecting members 451 but only a part that does not interfere with the equipment unit can be installed in advance in a planned manner, interference between the equipment unit to be installed later using a crane and the connecting members 451 can be prevented. Also, if the equipment 7 is installed after all the connecting members 451 are installed, it is necessary to complete the installation of the connecting members 451 with an opening for equipment installation provided. However, in this embodiment, since the equipment 7 is installed at the stage where some of the connecting members 451 are installed and the other connecting members 451 are installed later, it is not necessary to complete the installation of the connecting members 451 with an opening for equipment installation provided, and it is possible to shift to the next process (jackdown) more safely and efficiently in a structurally stable state.

[0061] Also, as described above, the equipment unit is configured to include attached steel frames joined to the steel beam 40 or the like, so that the equipment unit can be easily installed.

[0062] In this embodiment, after the gantry 100 is used to fabricate the groundwork in a state where the steel beam 40 is erected without laying it down and then lifted and installed by a crane, the yard for fabricating the steel beam 40 can be minimized, leading to space reduction, and the number of construction heavy machines such as cranes that can be installed can be increased. Also, the work of erecting the steel beam 40 with a crane or the like becomes unnecessary. Therefore, the construction period can be shortened, and the disaster risk during the erection of the steel beam 40 can be eliminated.

[0063] In this embodiment, the steel beam 40 can be supported by the bent 8 through the girder support fitting 812, and the steel beam 40 can be erected at a high position. The bent 8 can receive the load from the girder support fitting 812 to the jack 811 and can be removed after the jackdown of the roof steel frame 4.

[0064] In this embodiment, by using the steel beam 40 as a truss, high rigidity can be achieved with a small amount of steel. In this case, the connecting members 451 and 461 are provided to connect the upper chord members 41 of the steel beam 40 to each other and the lower chord members 42 to each other.

[0065] However, the present invention is not limited to the above-described embodiments. For example, in the present embodiment, the roof steel frame 4 of the arena structure 1 is divided into three in the span direction of the steel beam 40, but the number of divisions in the span direction is arbitrary and can be increased or decreased according to the situation.

[0066] Also, in the present embodiment, an example of constructing the roof steel frame 4 of the ceiling portion of the arena structure 1 has been described. However, the present invention is not limited to the arena structure 1 and can be applied when constructing the ceiling portion of a structure having a large space such as a large logistics facility, stadium, gymnasium, exhibition hall, airport, etc.

[0067] Moreover, the shape, arrangement, etc. of the roof steel frame 4 and the steel beam 40 are not particularly limited. For example, the steel beam 40 may be arranged radially. The position of the vent 8 etc. is determined according to the arrangement of the steel beam 40 etc. Similarly, the equipment 7 installed in the ceiling portion is not particularly limited, and the shape, configuration, etc. of the equipment unit including the equipment 7 are not particularly limited either.

[0068] In addition, in equipment construction, an operation of connecting the ends of the ducts 73 of adjacent duct units 10a occurs. The joint portion is separately manufactured based on the positional difference between the ends of both ducts 73 and is post-constructed after the construction of the roof steel frame 4 is completed. At this time, it is necessary to attach a working scaffold to the roof steel frame 4 for measuring the above positional difference and constructing the joint portion. On the other hand, by providing a joint portion having predetermined fire resistance, airtightness, heat insulation performance, and expansion and contraction functions in advance at the end of at least one duct 73, it is also possible to complete the connection of the duct 73 by the joint portion during the construction of the roof steel frame 4, leading to further shortening of the process and improvement in productivity.

[0069] As described above, the preferred embodiments of the present invention have been described with reference to the accompanying drawings. However, the present invention is not limited to such examples. It is obvious that those skilled in the art can conceive of various modification examples or correction examples within the scope of the technical idea disclosed in the present application, and it is naturally understood that those also belong to the technical scope of the present invention.

Explanation of Reference Numerals

[0070] 1: Arena structure 4: Roof steel frame 7: Facilities 8: Vent 10: Grape trellis unit 10a: Duct unit 10b: Catwalk unit 40: Steel beam 41: Top chord member 42: Bottom chord member 43: Diagonal member 44: Bundle member 45: Top chord steel frame 81: Support part 100: Stand 451, 461: Connecting member 811: Jack 812: Girder support fitting

Claims

1. When constructing a roof steel frame in which adjacent steel frame beams in a plan view are connected by connecting members, a step of installing a subsequent steel frame beam adjacent to the previously erected steel frame beam; a step of connecting adjacent steel frame beams with some of the connecting members; lifting an equipment unit including equipment in the ceiling part with a crane, arranging it between adjacent steel frame beams while avoiding interference with some of the connecting members, and installing the equipment unit between adjacent steel frame beams; a step of installing another connecting member between adjacent steel frame beams; A method for constructing a roof steel frame, characterized by performing the above steps.

2. The equipment unit includes the equipment and auxiliary steel frames, and the auxiliary steel frames are joined to the steel frame beams or the connecting members. The method for constructing a roof steel frame according to Claim 1, characterized in that.

3. The steel frame beam is fabricated by forming a ground structure in a standing state without laying it down using a scaffold, and then lifted and installed with a crane. The method for constructing a roof steel frame according to Claim 1, characterized in that.

4. The steel frame beam is supported and arranged by a girder receiving member from a temporary vent, After the construction of the roof steel frame, the load is transferred from the girder receiving member to a jack, and the vent is removed by jacking down. The method for constructing a roof steel frame according to Claim 1, characterized in that.

5. The steel frame beam is an upper chord member, a lower chord member, a bundle member provided vertically between the upper chord member and the lower chord member, a diagonal member provided obliquely with respect to the vertical direction between the upper chord member and the lower chord member, a truss-shaped member having the above, The connecting member connects the upper chord members of adjacent steel frame beams and the lower chord members of adjacent steel frame beams. The method for constructing a roof steel frame according to Claim 1, characterized in that.

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