Skeleton structure of large scale building

Abstract

To provide a skeleton structure that can efficiently lighten a skeleton structure of a large sale building including footing beams supported with bearing piles while stiffness of the junction between foundation piles and the footing beams being maintained.SOLUTION: A skeleton structure consists of RC pile head joint bodies 17 formed at the top end part of bearing piles 15, footing beams 11 that are laid between the RC pile head joint bodies 17 being arranged in a grid pattern, RC column bodies 18 standing on the RC pile head joint bodies 17, and ceiling joists 20 that are laid between the RC column bodies 18. The footing beams 11 are built by the "SRC-Made End Part S-Made Middle Part Hybrid Beam Construction Method" that comprises an RC beam end part 13 that, jutting out from the RC pile head joint body 17, is formed as a single body with the RC pile head joint body 17, and a steel beam 12 that, with its both ends 12a being buried in the RC beam end part 13, is laid between the adjacent RC pile head joint bodies 17. The ceiling joist 20 is made of a steel beam 22 that has its both end parts joined to the RC column body 18 by the "RC-Made Column S-Made Beam Hybrid Construction Method."SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a framework structure for a large-scale building, and in particular to a framework structure for a large-scale building that is constructed and supported by multiple support piles on a site area that is divided into vertical and horizontal grid sections when viewed in plan. [Background technology]

[0002] For example, the demand for logistics facilities has been increasing due to the recent expansion of the online shopping market, and as a result, many construction work orders have been placed to build large-scale buildings, preferably for logistics facilities.

[0003] Furthermore, in large-scale buildings such as warehouses in logistics facilities, in order to secure as much space as possible, it has been proposed to adopt a hybrid framework structure that combines reinforced concrete structural components with steel structural components made from various steel materials, while also increasing the span and reducing the weight of the framework structure. For example, it has been proposed to attach steel beams to reinforced concrete columns instead of reinforced concrete beams to reduce weight. Preferably, both ends of a steel beam spanning between opposing reinforced concrete columns are covered with reinforced concrete to form SRC beam ends, and the center of the beam is made of only steel beams to form a steel beam section of SRC construction. This hybrid beam construction method has also been developed, which increases the rigidity of the joint between the steel beam and the reinforced concrete column without requiring bracing members, while also reducing weight (see, for example, Patent Documents 1 and 2).

[0004] In addition, to further effectively reduce the weight of steel beams, a hybrid construction method has been developed in which steel beams are placed at the column-beam joints with the RC columns so that they penetrate the RC columns, and concrete is poured into the column-beam joints where the steel beams are placed, with the joints covered with cover plates (see, for example, Patent Documents 3 and 4). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-170386 [Patent Document 2] Japanese Patent Publication No. 2023-7003 [Patent Document 3] Japanese Patent Publication No. 2020-200586 [Patent Document 4] Japanese Patent Publication No. 2022-123147 Summary of the Invention [Problem to be solved by the invention]

[0006] On the other hand, when constructing a large-scale building such as a warehouse for a logistics facility, it is considered to adopt a construction method in which a large site area is preferably divided into many sections in a grid pattern vertically and horizontally, and many foundation piles are driven into each grid point position, with both ends of the driven foundation piles being supported, and reinforced concrete foundation beams are formed in a grid pattern connecting each grid point, and reinforced concrete columns for the building structure are erected from each grid point where the foundation piles have been driven, thereby forming a framework structure.However, in order to reduce the length, diameter, and number of foundation piles, and thereby reduce construction costs and shorten construction periods, it is desirable to further lighten the framework structure of large-scale buildings, including the foundation beams, while maintaining these functions.

[0007] Furthermore, if the site area on which a large-scale building is to be constructed is located above soft ground, for example during an earthquake, large loads will be placed on the foundation piles and the joints between the foundation piles and the foundation beams. Therefore, it is desirable to be able to more efficiently reduce the weight of the framework structure of a large-scale building, including the foundation beams, while maintaining the desired rigidity at these joints.

[0008] The present invention aims to provide a framework structure for a large-scale building that enables efficient weight reduction of the framework structure, including foundation beams, of a large mock-up building constructed on a site area that is divided into vertical and horizontal grid sections in a plan view and supported by support piles driven into the ground at each grid point, while maintaining the desired rigidity, particularly at the joints between the foundation piles and the foundation beams. [Means for solving the problem]

[0009] The present invention is a framework structure for a large-scale building constructed by being supported by a plurality of support piles driven into the ground at each of the grid points on a site area that is divided into sections in a grid pattern in a plan view, and is configured to include a plurality of the support piles, RC pile head joints made of reinforced concrete formed at the top ends of each of the support piles, foundation beams erected between the RC pile head joints and arranged in a grid pattern in the vertical and horizontal directions, RC columns made of reinforced concrete formed upright from the RC pile head joints, and ceiling beams for one or more floors erected between the RC columns and arranged in a grid pattern in the vertical and horizontal directions. The foundation beams are constructed using a hybrid beam construction method with SRC ends and S center, consisting of RC beam ends made of reinforced concrete that extend in a lattice direction from the side of the RC pile head joint and are formed integrally with the RC pile head joint, and steel beams whose ends on both sides are embedded in these RC beam ends and are erected between adjacent RC pile head joints, and the ceiling beams are made of steel beams whose ends are joined to the RC columns using a hybrid construction method with RC columns and S beams.The above-mentioned objectives have been achieved by providing a framework structure for large-scale buildings.

[0010] Furthermore, in the framework structure of the large-scale building of the present invention, in the hybrid construction method of RC columns and S beams, it is preferable that the column-beam joint where the steel beam is joined to the RC column is a beam-penetrating type joint formed by covering the concrete of the column-beam joint where the steel beam penetrates with a cover plate. [Effects of the Invention]

[0011] According to the framework structure of large-scale buildings of the present invention, the framework structure, including foundation beams, of a large-scale mock-up building constructed on a site area that is divided into vertical and horizontal grid sections in a plan view and supported by support piles driven into the ground at each grid point can be efficiently made lighter while maintaining the desired rigidity, particularly at the joints between the foundation piles and the foundation beams. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a plan view illustrating a site area divided into grid sections on which a large-scale building employing a frame structure according to a preferred embodiment of the present invention will be constructed. FIG. [Figure 2] FIG. 2 is a schematic cross-sectional view taken along the line AA in FIG. 1, illustrating a large-scale building employing a frame structure according to a preferred embodiment of the present invention. [Figure 3] FIG. 3 is an enlarged view of part B in FIG. 2, illustrating a frame structure in a large-scale building according to a preferred embodiment of the present invention. [Figure 4] This is a simplified perspective view illustrating a beam-through type column-beam joint in a hybrid construction method with reinforced concrete columns and steel beams. [Figure 5] This is a simplified plan view explaining the foundation beams, which are made using a hybrid beam construction method with SRC construction at the ends and S construction in the center. [Figure 6] FIG. 6 is a cross-sectional view taken along CC in FIG. 5. [Figure 7] This is a simplified cross-sectional view explaining the construction method of foundation beams using a hybrid beam construction method with SRC construction at the ends and S construction in the center. [Figure 8] This is a simplified cross-sectional view explaining the construction method of foundation beams using a hybrid beam construction method with SRC construction at the ends and S construction in the center. [Figure 9] This is a simplified cross-sectional view explaining the construction method of foundation beams using a hybrid beam construction method with SRC construction at the ends and S construction in the center. [Figure 10] 8(a) is a schematic cross-sectional view along DD in FIG. 8, which explains the construction method of foundation beams using a hybrid beam construction method with SRC reinforced concrete at the end and S steel in the center, and FIG. 9(b) is a schematic cross-sectional view along EE in FIG. 9. DETAILED DESCRIPTION OF THE INVENTION

[0013] The frame structure 10 for a large-scale building according to a preferred embodiment of the present invention shown in Figure 3 is a large-scale structure 50 (see Figure 2), which is adopted as a frame structure using a hybrid construction method that combines structural parts made of reinforced concrete (RC construction) with structural parts made of steel (S construction) using various steel materials, and is used, for example, in warehouses in logistics facilities, to ensure as much space as possible. Furthermore, as shown in Figures 1 and 2, the framework structure 10 of this embodiment is configured to include a large number of support piles 15 driven into a large number of grid points so that it can stably support a large-scale building 50 in a vast site area 51 that is preferably divided into a large number of sections in a grid pattern both vertically and horizontally.By using steel beams 12, 22 as the foundation beams 11 and ceiling beams 20 to reduce weight, it is possible to reduce the length, diameter, and number of the support piles 15, and by maintaining the desired rigidity at the joints between the support piles 15 and the foundation beams 11, it is possible to provide a structure that can sufficiently support the load applied to the joints between the support piles 15 and the foundation beams 11, especially during an earthquake, even if there is soft ground below the site area 51 on which the large-scale structure 50 is constructed.

[0014] The framework structure 10 of the large-scale building of this embodiment is a framework structure of the large-scale building 50 that is constructed and supported by a plurality of support piles 15 that are driven into the ground at each grid point on a site area 51 that is divided into sections in a grid pattern vertically and horizontally when viewed in a plan view, and as shown in Figures 3, 5 and 6, it is composed of a plurality of support piles 15, RC pile head joints 17 made of reinforced concrete formed at the upper end of each of these support piles 15, foundation beams 11 erected between these RC pile head joints 17 and arranged vertically and horizontally in a grid pattern, RC columns 18 made of reinforced concrete formed upright from the RC pile head joints 17, and ceiling beams 20 of one or more floors that are erected between these RC columns 18 and arranged vertically and horizontally in a grid pattern. The foundation beams 11 are constructed using a hybrid beam construction method with SRC ends and S center, consisting of RC beam ends 13 made of reinforced concrete that extend in a lattice direction from the side of the RC pile head joints 17 and are formed integrally with the RC pile head joints 17, and steel beams 12 with their ends 12a embedded in these RC beam ends 13 and erected between adjacent RC pile head joints 17.The ceiling beams 20 are constructed using a hybrid beam construction method with SRC ends and S beams, and their ends are joined to the RC columns 18.

[0015] In addition, in this embodiment, in the RC column and S beam hybrid construction method, the column-beam joint 19 where the steel beam 22 is joined to the RC column 18 is preferably a beam-penetration type joint formed by covering the concrete 23 of the column-beam joint 19, through which the steel beam 22 penetrates, with a cover plate 24, as shown in Figure 4.

[0016] In this embodiment, the large-scale building 50 to be constructed is, for example, a warehouse for a logistics facility. As shown in FIGS. 1 and 2, the building is constructed on a vast site 51, which is divided into sections in a grid pattern, e.g., at a predetermined pitch of approximately 11.0 to 13.5 meters, in a plan view. The site 51 is divided by leveling the ground surface of a ground 53, which has a soft layer below it. At each of the grid points located at the corners of the rectangular sections divided into grid-like sections, concrete or steel support piles 15, each with an outer diameter of approximately 1 meter, are cast from the ground surface to a depth of approximately 50 meters, extending from the ground surface to the supporting layer below. Each of these support piles 15 has a reinforced concrete RC pile head joint 17 at its upper end, which is formed by pouring cast-in-place concrete. The foundation beams 11 are supported by connecting both ends of each pair of adjacent RC pile head joints 17. In this embodiment, as shown in Figures 3 and 6, instead of the RC foundation beams made of reinforced concrete that have been commonly used in the past, the foundation beams 11 are made of a hybrid beam construction method with SRC ends and a steel center, consisting of RC beam ends 13 in which the ends 12a of steel beams 12 are embedded in reinforced concrete, and a central section made of steel beams 12.

[0017] In this embodiment, as shown in Fig. 5, the foundation beam 11, which is constructed using the hybrid beam construction method with SRC ends and steel centers, includes RC beam ends 13 made of reinforced concrete that extend in the lattice direction from the sides of the RC pile head joints 17 and are formed integrally with the RC pile head joints 17, and steel beams 12, preferably I-beams, that are erected between adjacent RC pile head joints 17, with ends 12a on both sides embedded in these RC beam ends 13. In this embodiment, the foundation beam 11, which is constructed using the hybrid beam construction method with SRC ends and steel centers, can be formed, for example, by the construction method shown in Figs. 7 to 9.

[0018] Specifically, in a construction method for forming a foundation beam 11 between a pair of adjacent RC pile head joints 17 using a hybrid beam construction method with SRC ends and a steel center, as shown in Figure 7, preparatory work involves excavating, laying, and leveling and compacting crushed stone between each pair of adjacent grids in a site area 51 and in the surrounding construction area 51a. Then, as shown in Figure 7, inverted formwork 56 is installed, for example, rectangularly surrounding the pile heads 15a of the support piles 15 installed at each grid point. Then, concrete is poured to form the base frame 57, which serves as a platform for assembling the formwork for the RC beam end 13. Furthermore, column reinforcing bars 58, preferably pre-assembled on the ground, are installed inside the inverted formwork 56 and installed in an upright position.

[0019] 8, for example, the formed base frame part 57 is used as a work frame to assemble the reinforcing bars 59 and formwork 60 of the RC pile head joint body 17 including the RC beam end part 13, and a beam support frame 61 for temporarily supporting the steel beam 12 is installed adjacent to the base frame part 57 with its height adjusted appropriately. Furthermore, the steel beam 12 is lifted using a heavy lifting machine such as a crawler crane and installed between the base frame parts 57 formed at the pair of RC beam end parts 13 so that it is supported by the installed beam support frames 61 on both sides.

[0020] Here, when assembling the rebars 59 at the RC beam end 13, as shown in Figure 10(a), the rebars 59 are assembled except for the upper end rebars 59a until the end 12a of the steel beam 12 is attached inside the assembled rebars 59. As shown in Figure 10(b), the steel beam 12 is erected between the base frames 57 of a pair of adjacent RC beam end 13 portions, and once the end portions 12a on both sides are attached inside the assembled rebars 59, the upper end rebars 59a are assembled. This makes it possible to smoothly attach the end 12a of the steel beam 12 inside the assembled rebars 59 while avoiding interference with the rebars 59 at the RC beam end 13.

[0021] After the steel beams 12 are installed between the base frames 57 of the pair of RC beam ends 13, as shown in Figure 9, the base frames 57 are assembled as a work platform. Concrete is poured into the formwork 60 of the RC pile head joints 17, including the RC beam ends 13, in a continuous manner with the inverted formwork 56. Allowing the concrete to solidify as a single unit forms the RC pile head joints 17, with the RC beam ends 13 integrally projecting from the sides in a lattice direction. As shown in Figure 6, the ends 12a of the steel beams 12 are embedded in the RC beam ends 13 of the RC pile head joints 17, resulting in the foundation beams 11, constructed using a hybrid beam construction method with SRC ends and steel centers, being installed as a single unit between each pair of adjacent RC pile head joints 17.

[0022] As a result, the upper parts of the column reinforcing bars 58, which protrude upward and have their lower parts buried in the RC pile head joint 17, will be positioned upright on the top surface of the formed RC pile head joint 17.By appropriately adding column reinforcing bars of the required length above these column reinforcing bars 58, assembling column formwork 60 around these reinforcing bars and pouring concrete, it becomes possible to form the RC column body 18 made of reinforced concrete that stands upright from the RC pile head joint 17 and extending it successively upward toward the upper floors of the building to be constructed.

[0023] In this embodiment, the ceiling beams 20 of one or more stories, which are erected between the RC columns 18 formed by extending them upward and arranged in a grid pattern, are made of steel beams 22, preferably I-beams, joined to the RC columns 18 using the RC column and S beam hybrid construction method, as described above. In the RC column and S beam hybrid construction method, the column beam joints 19 where the steel beams 22 are joined to the RC columns 18 are preferably of the well-known beam penetration type, formed with the steel beams 22 penetrating the column beam joints 19 covered with cover plates 24, as shown in Figure 4.

[0024] That is, similar to the column-beam joints described in the above-mentioned Japanese Patent Application Laid-Open Nos. 2020-200586 and 2022-123147, the beam-through type column-beam joint 19 is formed by attaching a cover plate unit 26 including a steel cylindrical cover plate 24 having a hollow rectangular (including square) cross-section, a penetration steel beam 25, preferably an I-beam, integrally joined to the cover plate 24 so as to penetrate between a pair of opposing surfaces of the cover plate 24, to the upper end of the RC column 18 from which the column reinforcing bars 58 further protrude upward, and pouring and solidifying filler concrete 23 inside the attached cover plate unit 26. As a result, the beam-through type column-beam joint 19 functions as a joint for joining the end 22a of the steel beam 22 to the formed RC column 18.

[0025] Furthermore, the steel beam 22 that forms the ceiling beam 20 is connected integrally with the outer protruding portion 25a of the penetration steel beam 25, which protrudes outward from the outer periphery of the steel cylindrical cover plate 24, at the beam-penetrating column-beam joint 19 using the cover plate unit 26, by bolting or the like at both end portions 22a, thereby forming a steel beam that penetrates the RC column 18 together with the penetration steel beam 25.

[0026] As a result, in this embodiment, the ceiling beams 20 of one or more floors, which are erected between a pair of adjacent RC columns 18 and arranged vertically and horizontally in a grid pattern, are formed from steel beams 22 whose ends are joined to the RC columns 18 using a hybrid construction method of RC columns and S beams.

[0027] Furthermore, according to the framework structure 10 of the large-scale building of this embodiment having the above-mentioned configuration, it is possible to efficiently reduce the weight of the framework structure 10, including the foundation beams 11, of the large-scale building 50, which is constructed and supported by support piles 15 driven into the ground at each grid point on a site area 51 that is divided into grid sections vertically and horizontally when viewed in plan, while maintaining the desired rigidity, particularly at the joints between the support piles 15 and the foundation beams 11.

[0028] In other words, according to the framework structure 10 of this embodiment, the foundation beams 11 are constructed using a hybrid beam construction method with SRC ends and S-framed centers, consisting of RC beam ends 13 made of reinforced concrete that extend in a lattice direction from the side of the RC pile head joint 17 and are formed integrally with the RC pile head joint 17, and steel beams 12 whose ends 12a on both sides are embedded in these RC beam ends 13 and are erected between adjacent RC pile head joints 17.The ceiling beams 20 are made of steel beams 22 whose ends are joined to the RC columns 18 using a hybrid construction method with RC columns and S-framed beams.Therefore, by using steel beams 12, 22 instead of RC beams as the foundation beams 11 and the ceiling beams 20 of one or more floors, it is possible to efficiently reduce weight.

[0029] In particular, the foundation beam 11 is made using a hybrid beam construction method with SRC ends and S construction in the center, consisting of RC beam ends 13 made of reinforced concrete formed integrally with the RC pile head joint 17, and steel beams 12 with steel ends 12a on both sides embedded in these RC beam ends 13.Therefore, while achieving weight reduction, even if large loads are placed on the foundation piles and the joints between the foundation piles and the foundation beams, for example during an earthquake, the desired rigidity is maintained at these joints, making it possible to fully support the load applied.

[0030] The present invention is not limited to the above-described embodiment and various modifications are possible. For example, the beam-column joint where a steel beam is joined to an RC column does not necessarily have to be a beam-through joint formed by covering the concrete of the beam-column joint with a cover plate, and may be any other beam-column joint used in a RC column / S beam hybrid construction method. [Explanation of symbols]

[0031] 10. Frame structures in large-scale buildings 11 Foundation beam 12 Steel beams 12a end 13 RC beam end 15 Support pile 15a Pile head 16 Longitudinal connecting hole groove 17 RC pile cap joint 18 RC column 19 Column beam joint 20 Ceiling beams 22 Steel beam 22a end 23 Concrete 24 Covering board 25 Steel beam of penetration part 25a External protrusion 26 Covering plate unit 50 Large-scale structures 51 Site Area 51a Construction area 53 Ground 55 Concrete 56 Reverse Formwork 57 Base stand 58 Column reinforcing bars 59 Reinforcement of RC pile head joint 59a Top bar 60 Formwork for RC pile head joint 61 Beam support stand

Claims

1. A framework structure for a large-scale building constructed by being supported by a plurality of support piles installed at each lattice point in a site area that is divided into vertical and horizontal grid sections in a plan view. The structure comprises a plurality of the support piles, RC pile head joints made of reinforced concrete formed at the upper ends of each of the support piles, foundation beams erected between the RC pile head joints and arranged vertically and horizontally in a grid pattern, RC columns made of reinforced concrete formed upright from the RC pile head joints, and ceiling beams of one or more floor portions erected between the RC columns and arranged vertically and horizontally in a grid pattern, The foundation beams are made of reinforced concrete RC beam ends that extend in a lattice direction from the side of the RC pile head joints and are formed integrally with the RC pile head joints, and steel beams whose ends on both sides are embedded in these RC beam ends and are installed between the adjacent RC pile head joints.These are made of a hybrid beam construction method with SRC ends and steel in the center. The ceiling beams are a framework structure in large-scale buildings, made of steel beams whose ends are joined to the reinforced concrete columns using a hybrid construction method with reinforced concrete columns and steel beams.

2. In the hybrid construction method of reinforced concrete columns and steel beams, the column-beam joint where the steel beam is joined to the reinforced concrete column is a beam-penetrating type joint formed by covering the concrete of the column-beam joint through which the steel beam penetrates with a cover plate.

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