Floor structure of steel-framed buildings

Abstract

To provide a floor structure for steel-framed buildings that is sufficiently durable without need for horizontal braces or ALC (autoclaved lightweight concrete) panels.SOLUTION: A floor structure 100 of a steel-framed building is built up on a frame structure consisting of steel beams 2 made from H-shaped steel and steel columns 1 made from square steel pipes, and is equipped with wooden support members 3 placed and fixed on the upper side of the steel beams 2 made from H-shaped steel, and multiple assembled wooden floor beams 4 that are strung between the steel beams 2 and held by the wooden support members 3.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a built-floor structure for a steel frame building having parallel steel beams spanning between steel columns. [Background technology]

[0002] Traditionally, in wooden buildings, floor structures are usually made by combining wooden pillars, beams, and floorboards, whereas in the assembled floor structure of a steel frame building, a steel frame that has high strength and durability and can maintain stability even with a large load is used as the floor framework, and floor slabs such as ALC (lightweight foamed concrete) or concrete slabs are placed between the steel frames.

[0003] Generally, wooden buildings constructed using the traditional method of building a wooden framework by assembling lumber with square cross-sections as pillars and beams are constructed by erecting pillars on a base anchored to the foundation, spanning beams to form a pillar-beam framework, and floorboards such as structural plywood are placed on top of the beams that cross at right angles, which serve as support for the floorboards. The pillar-beam framework can be made rigid by inserting braces. In addition, in the wooden frame wall construction method, also known as the two-by-four method, structural plywood (wall panels) are nailed to a wooden framework to provide walls and floorboards, preventing the framework from deforming too much.

[0004] Steel-frame buildings are constructed as highly precise, rigid structures by processing and assembling steel structural members in factories and then constructing them on site. Deck plates are often used for the floors attached to these steel-frame buildings, and composite slabs of deck plates and concrete are well known as rational, economical floor structures with excellent workability and strength, in which the deck plate acts as a formwork when the concrete is poured and acts as a tensile reinforcing bar integrated with the concrete after it hardens (see, for example, Patent Documents 1 and 2).

[0005] Also, as for the floor structure of a steel frame building, it is known to use ALC (lightweight foamed concrete) panels and place them directly on beams (floor beams) (see, for example, Patent Documents 3 and 4). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 10-169066 [Patent Document 2] JP 2000-144996 A [Patent Document 3] JP2016-033299A [Patent Document 4] Patent Publication No. 2022-144516 [Patent Document 5] JP 2022-162430 A Summary of the Invention [Problem to be solved by the invention]

[0007] However, in floor structures using composite slabs of deck plates and concrete, laying the deck plates and pouring the concrete is very difficult, and a period of time is required for the concrete to harden and cure, resulting in a long construction period.

[0008] In addition, by using dry ALC panels rather than a composite slab made of wet deck plates and concrete, issues such as the curing period are improved; however, in a floor structure where the ALC panels are placed directly on the floor beams, it is necessary to place steel beams at appropriate intervals due to the strength of the ALC panels, which are made of lightweight foamed concrete, which requires the use of a lot of steel and makes construction difficult.

[0009] The applicant of the present application has previously proposed a cross member constructed by combining a plurality of reinforcing members each formed of laminated veneer lumber (see, for example, Patent Document 5).

[0010] This cross member can ensure sufficient strength while avoiding an increase in the volume of the material.

[0011] In view of the above-mentioned conventional situation, the object of the present invention is to provide an assembled floor structure for a steel frame building which employs the above-mentioned cross members as floor beam members of a structure which supports the floor panels in the assembled floor structure of a steel frame building, and which uses the above-mentioned cross members as prefabricated wooden floor beams which support only the floor panels, thereby ensuring the rigidity of the horizontal structural surface of the floor.

[0012] Further objects of the present invention and specific advantages obtained by the present invention will become more apparent from the following description of the embodiments with reference to the drawings. [Means for solving the problem]

[0013] In this invention, in the assembled floor structure of a steel frame building having parallel steel beams spanning steel columns, without using composite slabs or ALC panels, the rigidity of the horizontal structural surface of the floor is ensured by arranging a plurality of prefabricated wooden floor beams as joists, each of which is made up of a plurality of web members arranged in a row at intervals, an upper flange member made up of a pair of plate-like members that connects and fixes the plurality of web members while sandwiching the upper sides of the plurality of web members, and a lower flange member made up of a pair of plate-like members that connects and fixes the plurality of web members while sandwiching the lower sides of the plurality of web members.

[0014] In other words, the present invention is a floor structure for a steel frame building having parallel steel beams that are spanned between steel columns, comprising a wooden support material placed and fixed on the upper side of the steel beams, and a plurality of assembled wooden floor beams that are spanned between the steel beams and held by the wooden support material, the assembled wooden floor beams comprising a plurality of web members arranged in a row at intervals, an upper flange member consisting of a pair of plate-shaped members that connect and fix the plurality of web members while sandwiching the upper side sides of the plurality of web members, and a lower flange member consisting of a pair of plate-shaped members that connect and fix the plurality of web members while sandwiching the lower side sides of the plurality of web members, and both ends of the upper flange member are held by the wooden support material placed and fixed on the parallel steel beams.

[0015] In the assembled floor structure of a steel frame building according to the present invention, the wooden support member can be placed on the upper side of the steel beam and fixed thereto by fixing means.

[0016] In addition, in the assembled floor structure of a steel frame building according to the present invention, the wooden support material can be a square piece of wood having a plurality of fitting notches into which the ends of the upper flange members are fitted.

[0017] In addition, in the assembled floor structure of a steel frame building according to the present invention, the prefabricated wooden floor beams may be formed from a plurality of laminated veneer lumber. Effect of the Invention

[0018] As described above, in the assembled floor structure of a steel frame building according to the present invention, by arranging a plurality of prefabricated wooden floor beams as joists supporting the floor boards of a steel frame building, the prefabricated wooden floor beams each comprising a plurality of web members arranged in a row with a gap between them, an upper flange member made of a pair of plate-like members which connects and fixes the plurality of web members while sandwiching the upper side sides of the plurality of web members, and a lower flange member made of a pair of plate-like members which connects and fixes the plurality of web members while sandwiching the lower side sides of the plurality of web members, the rigidity of the horizontal structural surface of the floor can be ensured.

[0019] Therefore, according to the present invention, by employing the cross members previously proposed by the present applicant as floor beam members of the structure that supports the floor panels in the assembled floor structure of a steel frame building, and using the cross members as prefabricated wooden floor beams that support only the floor panels, it is possible to provide an assembled floor structure for a steel frame building that ensures the rigidity of the horizontal structural surface of the floor. [Brief description of the drawings]

[0020] [Figure 1] FIG. 1 is a perspective view of an assembled floor structure of a steel frame building according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a plan view of the assembled floor structure. [Diagram 3] FIG. 3 is a perspective view of a prefabricated wooden floor beam used in the above-mentioned assembled floor structure. [Figure 4] FIG. 4(a) is a front view of the prefabricated wooden floor beam, FIG. 4(b) is a plan view of the prefabricated wooden floor beam, and FIG. 4(c) is a schematic side view of the prefabricated wooden floor beam. [Diagram 5] FIG. 5 is a front view showing a list of six types of cross members with different spans prepared as the prefabricated wooden floor beams. [Figure 6] FIG. 6 is a longitudinal sectional view of an essential part of a portion for fixing the wooden support member placed on the upper side of the steel beam in the assembled floor structure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the drawings. Note that the present embodiment described below does not unduly limit the content of the present invention described in the claims, and all of the configurations described in the present embodiment are not necessarily essential as a means for solving the problem of the present invention.

[0022] FIG. 1 is a perspective view of a constructed floor structure 100 for a steel frame building according to an embodiment of the present invention, and FIG. 2 is a plan view of the constructed floor structure 100. As shown in FIG.

[0023] The steel frame building to which this invention is applicable mainly comprises a foundation, structural members supported by the foundation, and members supported by the structural members, and has a frame structure consisting of a number of steel columns 1 and a number of parallel steel beams 2 spanning between the steel columns 1.

[0024] The assembled floor structure 100 of this steel frame building is set up on a frame structure consisting of the steel beams 2 made of H-shaped steel and the steel columns 1 made of square steel pipes, and comprises a wooden support 3 placed and fixed on the upper side of the steel beams 2 made of H-shaped steel, and a plurality of assembled wooden floor beams 4 that are spanned between the steel beams 2 and held by the wooden support 3.

[0025] Seven wooden floor beams 4 are suspended parallel to each other between steel beams 2 made of H-shaped steel and supported by the wooden supports 3 placed and fixed to the upper sides of the steel beams 2, thereby constructing an assembled floor structure 100.

[0026] The assembled floor structure 100 of this steel frame building is constructed by laying a base plywood board that is square in plan view and made of wood-based plate material such as particle board, and is further finished with a floor finishing material such as flooring.

[0027] The assembled floor structure 100 of this steel frame building employs the cross members disclosed in JP 2022-162430, previously proposed by the present applicant, as floor beam members of a structure supporting floor panels in the assembled floor structure of a steel frame building.

[0028] Fig. 3 is a perspective view of a prefabricated wooden floor beam 4 used in the above-mentioned assembled floor structure 100. Fig. 4(a) is a front view of the prefabricated wooden floor beam 4, Fig. 4(b) is a plan view of the prefabricated wooden floor beam 4, and Fig. 4(c) is a side view of the prefabricated wooden floor beam 4.

[0029] This prefabricated wooden floor beam 4 is composed of a plurality of web members 20 (21-25) arranged in a row with a gap between them, an upper flange member 10U (11, 12) consisting of a pair of plate-like members that connect and fix the plurality of web members 20 (21-25) while sandwiching the upper side sides of the plurality of web members 20 (21-25), and a lower flange member 10L (13, 14) consisting of a pair of plate-like members that connect and fix the plurality of web members 20 while sandwiching the lower side sides of the plurality of web members 20. In the following, for convenience of explanation, the direction in which the flange members 10 (bolts 10U, 10L) extend is defined as the X direction, the plate thickness direction of the flange members 10 (10U, 10L) is defined as the Y direction, and the direction perpendicular to both the X direction and the Y direction is defined as the Z direction. In the following description, when the flange members 11-14 are not differentiated from one another, they will simply be referred to as flange members 10 (10U, 10L), and when the web members 21-25 are not differentiated from one another, they will simply be referred to as web member 20.

[0030] In the prefabricated wooden floor beam 4, as shown in Figs. 3 and 4, each flange member 11, 12, 13, 14 is a long plate-like member extending in the X direction and formed in a straight line in a front view. The flange members 11, 12 are upper flange members 10U that connect and fix the plurality of web members 20 (21-25) while sandwiching the upper side sides of the plurality of web members 20 (21-25), and the flange members 13, 14 are lower flange members 10U that connect and fix the plurality of web members 20 (21-25) while sandwiching the lower side sides of the plurality of web members 20 (21-25). The flange members 11, 12, 13, 14 may have the same length or different lengths. The flange members 11, 12 arranged on the upper side and the flange members 13, 14 arranged on the lower side are arranged parallel to each other while being vertically spaced apart from each other via the web member 20. The interval between the flange members 10 (the separation distance in the Z direction) is not particularly limited.

[0031] That is, each flange member 10 in this prefabricated wooden floor beam 4 is composed of a pair of plate-like members 10a, 10b. For example, as shown in FIG. 4(b), the flange member 11 is composed of plate-like members 11a, 11b, and the flange member 12 is composed of plate-like members 12a, 12b. The plate-like members 10a, 10b are formed in the same shape and are arranged opposite each other with the web member 20 in between. Note that the flange member 10 only needs to have plate-like members 10a, 10b of different lengths arranged alternately in the front-back or up-down direction. The plate-like members 10a and 10b may also be formed from the same wood.

[0032] As shown in FIG. 4(a), by changing the height (length in the Z direction) of the web member 20, the beam depth h (dimension in the Z direction) of the prefabricated wooden floor beam 4 can be changed. The overall length of the flange members 10 is determined according to the location where they are placed. The length of the upper flange members 10U (11, 12) is made longer than the length of the lower flange members 10L (13, 14). As a result, spaces are formed below both sides of the prefabricated wooden floor beam 4. Members such as beams and columns that support the prefabricated wooden floor beam 4 from below are placed in these spaces.

[0033] Each of the plate-like members 10a, 10b constituting the flange member 10 is made of wood, for example, LVL (Laminated Veneer Lumber), but is not limited thereto and may be made of lumber or other wood or steel. LVL has a layered structure in which multiple veneers are laminated, and is obtained, for example, by thermocompression bonding the veneers together. By laminating multiple veneers, the strength of the flange member 10 can be improved and the occurrence of warping or bending in the longitudinal direction can be suppressed.

[0034] The material of the plate-like members 10a, 10b (flange member 10) is not particularly limited, but the flange member 10 may be made of a relatively soft wood such as cedar. However, the material is not limited to cedar and may be any wood as long as the Young's modulus of bending value is within the range stipulated in the 60E Young's modulus of bending category of the JAS standard.

[0035] The web member 20 is a plate-like member formed in a square shape when viewed from the front. The web member 20 is arranged so as to be sandwiched between the upper and lower flange members 10 (between the upper chord member and the lower chord member), and connects the plurality of flange members 10 together. Specifically, as shown in Figs. 3 and 4, the web member 20 is composed of a first web member 21, a second web member 22, a third web member 23, a fourth web member 24, and a fifth web member 25, and the first web member 21, the second web member 22, the third web member 23, the fourth web member 24, and the fifth web member 25 are arranged at equal intervals along the X direction in this order while being sandwiched between the flange members 11 and 12 and the flange members 13 and 14, and connects the flange members 10 together. Note that the intervals between the web members 20 are not limited to being equal. Furthermore, the number of the web members 20 is not limited to five, and is not particularly limited.

[0036] As shown in Fig. 4, each web member 20 is sandwiched between a pair of plate-like members 10a, 10b in the Y direction and is disposed at a fixed interval in the X direction. Although each web member 20 is formed to have the same size, the dimensions of some of the web members 20 may be different. For example, only the first web member 21 and the fifth web member 25 located on both sides in the longitudinal direction of the prefabricated wooden floor beam 4 may be formed to be narrower than the second web member 22, the third web member 23, and the fourth web member 24.

[0037] The thickness of the web member 20 only needs to be approximately the same as that of the plate-like members 10a, 10b, and may be changed as appropriate depending on the strength required for the prefabricated wooden floor beam 4. The height (dimension in the Z direction) of the web member 20 is, for example, approximately 20 to 40 centimeters, but can be changed as appropriate taking into consideration the location where the prefabricated wooden floor beam 4 is placed. The beam depth h of the prefabricated wooden floor beam 4 also changes as the height of the web member 20 changes. The web member 20 is made of wood, and may be made of the same material as the flange members 10, or may be made of a different material.

[0038] Fixing members 30 for fixing the flange member 10 to the web member 20 are disposed at the four corners of the web member 20. Specifically, fixing members 30 such as screws are inserted and fixed at positions in the vicinity of the four corners of the web member 20, penetrating the web member 20 from the plate-like member 10a side until they reach plate-like member 10b. Note that the fixing members 30 may also be inserted and fixed by penetrating the web member 20 from the plate-like member 10b side until they reach plate-like member 10a.

[0039] In this way, by fixing the flange members 10 to the four corners of the web member 20, the strength of the prefabricated wooden floor beam 4 can be increased. Note that the locations where the fixing members 30 are arranged are not limited to the four corners of the web member 20, and may be any location as long as the flange members 10 can be fixed to the web member 20. Furthermore, the fixing members 30 are not limited to screws, and may be any configuration that has the function of fixing the flange members 10 and the web member 20, such as a combination of bolts and nuts, nails, rivets, etc.

[0040] In the prefabricated wooden floor beam 4, a plurality of openings 40 are formed by a plurality of flange members 10 and a plurality of web members 20. Specifically, as shown in Figs. 3 to 4, a plurality of openings 40 are formed in a line along the X direction of the prefabricated wooden floor beam 4. Each opening 40 is formed in a rectangular shape in a plan view, and each opening 40 is formed to be approximately the same size. As shown in Figs. 3 and 4(a), the width of the opening 40 is formed to be approximately the same length as the width of the web member 20. This is because the web members 20 are arranged at equal intervals in the X direction, separated by the width dimension of the web member 20. Note that the web members 20 do not need to be arranged at equal intervals, and may be arranged at intervals sufficient to form the openings 40.

[0041] In this way, the prefabricated wooden floor beam 4 has a plurality of openings 40 formed by combining a plurality of flange members 10 extending in the horizontal direction and a plurality of web members 20 extending in the vertical direction. That is, the prefabricated wooden floor beam 4 is formed in a Vierendeel beam shape in which plate-shaped members are combined in the vertical and horizontal directions and gaps are formed between the plate-shaped members. This allows the amount of material used to be reduced by the amount of the gaps, and the prefabricated wooden floor beam 4 can be made lighter. In addition, the formation of a plurality of gaps (openings 40) in the prefabricated wooden floor beam 4 makes it easier to pass piping, pipes, etc. through the prefabricated wooden floor beam 4. Furthermore, since the web member 20 is fixed in a state of being sandwiched between a pair of plate-shaped members 10a, 10b, sufficient strength can be ensured even if the prefabricated wooden floor beam 4 is made of wood.

[0042] Here, as shown in FIG. 5, six types of cross members 4A to 4F are prepared as standard products, each of which has a different span of 1365 mm to 3640 mm and is comprised of cross members 4A to 4F, namely, cross member 4A with one opening 40 and a span of 1365 mm, cross member 4B with two openings 40 and a span of 1820 mm, cross member 4C with two openings 40 and a span of 2275 mm, cross member 4D with three openings 40 and a span of 2730 mm, cross member 4E with three openings 40 and a span of 3185 mm, and cross member 4F with four openings 40 and a span of 3640 mm.

[0043] In the assembled floor structure 100 of this steel frame building, the four openings 40 and the cross beams 4F with a span of 3640 mm are used as the assembly, and seven wooden floor beams 4 are spanned in parallel between the steel beams 2 made of H-shaped steel of a steel frame measuring 3640 mm in length and 3640 mm in width, and are supported by wooden supports 3 placed and fixed on the upper sides of the steel beams 2.

[0044] The wooden support material 3 in the assembled floor structure 100 of this steel-frame building is made of square wood with multiple fitting notches 5 into which the ends of the upper flange members 10U of the prefabricated wooden floor beams 4 are fitted, and is fixed in place with bolts and nuts while being placed on top of the steel beams 2 made of H-shaped steel, as shown in Figure 6.

[0045] That is, the wooden support material 3 is provided with a plurality of insertion holes 6 for bolts 8, and the wooden support material 3 is placed on the upper side of the steel beam 2 using H-shaped steel so that a plurality of nuts 7 welded to predetermined positions on the upper side of the steel beam 2 are embedded in the bottom of the insertion holes 6. Then, the wooden support material 3 is fixed to the steel beam 2 by inserting the bolts 8 into the insertion holes 6 and tightening them.

[0046] Here, the wooden support 3 is fixed to the steel beam 2 using H-shaped steel by bolts and nuts, but it can also be fixed by fixing means in a state where it is placed on the top of the steel beam 2, for example, it can be fixed by using structural screws that can be fastened without drilling holes in the steel base. The fixing means for fixing the wooden support 3 to the steel beam 2 is a concept that includes nails, screws, bolts, nuts, adhesives, etc.

[0047] The assembled floor structure 100 of a steel frame building shown in Figures 1 and 2 uses long-span cross members 4F with a total length of 3,640 mm as wooden floor beams 4, and has a frame structure consisting of multiple steel columns 1 and multiple parallel steel beams 2 spanning between the steel columns 1. The assembled floor structure 100 of a steel frame building is installed on a steel frame, and provides sufficient durability without the need for horizontal braces, ALC (lightweight foamed concrete) panels, etc. Seven wooden floor beams 4 are spanned in parallel between steel beams 2 made of H-shaped steel of a steel frame, and each unit is held in place by wooden supports 3 placed and fixed to the upper side of the steel beams 2. This assembled floor structure 100, with each unit being 3640 mm in length and 3640 mm in width, is highly durable. Since long-span horizontal members 4F with a total length L of 3640 mm are used as the wooden floor beams 4, in an actual steel frame building having multiple assembled floor structure 100 units, the number of steel columns 1 and steel beams 2 can be drastically reduced.

[0048] Although the above-mentioned assembled floor structure 100 of the steel frame building uses long-span cross members 4F with a total length L of 3640 mm as the wooden floor beams 4, the assembled floor structure 100 of the steel frame building may also be constructed using other cross members 4A to 4E as the wooden support members 3, and the assembled floor structure 100 of the steel frame building may also be constructed using cross members of dimensions other than the above-mentioned standardized cross members 4A to 4F as the wooden support members 3.

[0049] 1 steel column, 2 steel beam, 3 wooden support member, 4 assembled wooden floor beam, 4A to 4F horizontal member, 5 notch for insertion, 6 insertion hole, 7 nut, 8 bolt, 10U (11, 12) upper flange member, 10L (13, 14) lower flange member, 10a, 10b, 11a, 11b, 12a, 12b, 13a, 13b, 14b, 14b plate-shaped member, plate-shaped member, 20 (21-25) Web member, 30 Fixing member, 40 Opening, 100 Floor structure,

Claims

1. A floor structure for a steel frame building having parallel steel beams spanned between steel columns, A wooden support material is placed and fixed on the upper side of the steel beam; a plurality of prefabricated wooden floor beams that are spanned between the steel beams and supported by the wooden support members; Equipped with The above assembled wooden floor beams are A plurality of web members arranged in a row at intervals; an upper flange member consisting of a pair of plate-like members that connects and fixes the plurality of web members in a state in which the upper sides of the plurality of web members are sandwiched between the upper flange members; a lower flange member formed of a pair of plate-shaped members that connect and fix the plurality of web members in a state in which the lower sides of the plurality of web members are sandwiched therebetween; It consists of: A floor structure for a steel frame building, characterized in that both ends of the upper flange member are supported by wooden supports placed and fixed to the parallel steel beams.

2. 2. The assembled floor structure of a steel frame building according to claim 1, wherein the wooden support member is placed on the upper side of the steel beam and fixed thereto by fixing means.

3. 3. The assembled floor structure of a steel frame building according to claim 2, wherein the wooden support material is a square piece of wood having a plurality of notches into which the ends of the upper flange members are fitted.

4. 2. The assembled floor structure of a steel frame building according to claim 1, wherein the prefabricated wooden floor beams are formed from a plurality of laminated veneer lumber.

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