Column-beam connection precast concrete member and column-beam connection structure

Abstract

To provide a column-beam connection precast concrete member suitable for a column-beam connection structure between a steel beam and a reinforced concrete column, and also to provide the column-beam connection structure.SOLUTION: A column-beam connection precast concrete member 5 comprises: a steel beam end 21 of a steel beam 20 disposed on a reinforced concrete column 10 among the steel beams 20; a composite structure beam end 31 in which one end in a long axis direction of a steel beam end 32 of the steel beam of a composite structure beam 30 is disposed so as to be spaced a predetermined distance D1 away from the steel beam end 21 of the steel beam 20; and a beam intersection 40 in which an upper end reinforcement 34 and a lower end reinforcement 35 are arranged integrally with the composite structure beam end 31, concrete is placed at least up to height of a steel beam top level of the steel beam end 32 of the steel beam of the composite structure beam 30, the composite structure beam end 31 and the steel beam end 21 of the steel beam 20 are connected, and insertion holes 15 allowing column main reinforcements 12 of the reinforced concrete column 10 to be inserted are formed.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a precast concrete member and a beam-column joint structure, and in particular to a composite structural beam consisting of a reinforced concrete beam at the end and a steel beam in the center, and a precast concrete member and a beam-column joint structure between a steel beam and a reinforced concrete column. [Background technology]

[0002] In order to ensure a large beam span for a building or to shorten construction time, a composite structure may be applied that combines H-shaped steel beams, which have good cross-sectional performance, with reinforced concrete columns that are resistant to compressive forces.

[0003] Furthermore, in order to reduce on-site construction work, for example, as shown in Patent Document 1, the ends of composite structural beams may be made of precast concrete. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 3-066852 Summary of the Invention [Problem to be solved by the invention]

[0005] In the beam-column joint structure described in Patent Document 1, the intersections of steel beams 3,3 are rigidly joined by welding or the like at a steel frame factory to construct a rigid frame structure in both the X and Y directions. However, this beam-column joint structure requires a lot of welding work because the cross-sectional shape near the intersection of the steel beams is complex, and the work requires the work of skilled welders, which results in high costs, time, etc. In addition, because the beams are composite structures in both the X and Y directions, the overall dimensions of the precast members are large, making it difficult to load them onto the bed of a transport truck, which has a width limit.

[0006] Therefore, an object of the present invention is to provide a precast concrete column-beam joint member and a column-beam joint structure that are suitable for a column-beam joint structure between a steel beam and a reinforced concrete column. [Means for solving the problem]

[0007] In order to achieve the above object, the present invention provides a precast concrete component for a beam-column joint, which is a precast concrete component used for a beam-column joint structure between a composite structural beam consisting of a first steel beam at the center of a reinforced concrete beam at the end of the component, a second steel beam erected in a direction intersecting the first steel beam, and a reinforced concrete column, the precast concrete component comprising: a steel beam end of the second steel beam that is arranged at the top of the reinforced concrete column among the second steel beams; a composite structural beam end in which one end in the longitudinal direction of the steel beam end of the first steel beam is arranged at a predetermined distance from the steel beam end of the second steel beam; and a beam intersection in which concrete is poured integrally with the composite structural beam end at least up to the height of the steel beam top end of the steel beam end of the first steel beam, joining the composite structural beam end and the steel beam end of the second steel beam, and having an insertion hole through which the column main reinforcement of the reinforced concrete column can be inserted.

[0008] It is preferable that one end of the steel beam end of the other first steel beam in the longitudinal direction faces the composite structural beam across the beam intersection and further comprises another composite structural beam end arranged at the specified distance from the steel beam end of the second steel beam, and that concrete is poured integrally from the composite structural beam end through the beam intersection to the other composite structural beam end, at least up to the height of the steel beam top end of the steel beam end of the first steel beam.

[0009] It is preferable that the beam depth of the first steel beam is smaller than the beam depth of the second steel beam.

[0010] As a column-beam joint structure, the present invention comprises a column-beam joint precast concrete member and the reinforced concrete column in which the column main reinforcement is inserted into the insertion hole.

[0011] It is preferable that the post-cast concrete poured on-site on top of the concrete at the end of the composite structural beam has a lower strength than the concrete. Effect of the Invention

[0012] According to the present invention, it is possible to provide a precast concrete column-beam joint member and a column-beam joint structure that are suitable for a column-beam joint structure between a steel beam and a reinforced concrete column. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1(a) is a front cross-sectional view showing a column-beam joint structure between a steel beam or composite beam and a reinforced concrete column using a column-beam joint precast concrete member according to the first embodiment of the present invention, and FIG. 1(b) is a plan cross-sectional view taken along the Ib-Ib section line in FIG. 1(a). [Diagram 2] FIG. 2A is a front cross-sectional view of a beam-column joint precast concrete component according to the first embodiment, and FIG. 2B is a plan cross-sectional view taken along the line IIb-IIb in FIG. [Diagram 3] FIG. 1 is a plan view showing a column-beam structure including a column-beam joint structure between a steel beam and a composite structural beam using a column-beam joint precast concrete member according to the first embodiment of the present invention, and a reinforced concrete column. [Figure 4] (a) is a plan cross-sectional view of a precast concrete column-beam joint member used in a column-beam joint where a steel beam is spanned in only one direction, (b) is a plan cross-sectional view of a precast concrete column-beam joint member used in a column-beam joint where a composite structural beam is spanned in only one direction, and (c) is a plan cross-sectional view of a precast concrete column-beam joint member used in a column-beam joint where a steel beam and a composite structural beam are each spanned in only one direction. [Diagram 5] FIG. 10A is a front cross-sectional view showing a column-beam joint structure between a steel beam or composite beam and a reinforced concrete column using a column-beam joint precast concrete member according to the second embodiment of the present invention, and FIG. 10B is a plan cross-sectional view taken along the Vb-Vb section line in FIG. 10A. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A precast concrete beam-column joint structure and a beam-column joint structure according to an embodiment of the present invention will now be described with reference to the accompanying drawings. In addition, the same reference numerals are used to designate the same or equivalent components.

[0015] [First embodiment] 1(a) and (b) show a column beam joint structure 1 using a column beam joint precast concrete member 5 according to the first embodiment of the present invention. The column beam joint structure 1 is composed of a reinforced concrete column 10, a steel beam 20 penetrating the top of the reinforced concrete column 10, a composite structural beam 30 erected in a direction intersecting the steel beam 20, and a reinforced concrete beam intersection 40 provided at the position where the steel beam 20 penetrates at the top of the reinforced concrete column 10 and at the longitudinal end of the composite structural beam 30. The column beam joint structure 1 uses a column beam joint precast concrete member 5 fabricated in advance at a factory, which is composed of the beam intersection 40 arranged at the top of the reinforced concrete column 10, and the steel beam end 21 and composite structural beam end 31 connected to the beam intersection 40, as shown in FIG. 2(a) and (b).

[0016] The reinforced concrete column 10 (hereinafter referred to as the column 10) is a column made of cast-in-place reinforced concrete with a cross section of 1050 mm × 1050 mm. As shown in Figures 1(a) and (b), the column main reinforcement 12 protruding from the upper end of the column body 11 is arranged at a position where it does not interfere with the end 21 of the steel beam.

[0017] The steel beam 20 is an H-shaped steel, and is installed so as to penetrate the column body 11 of the column 10. In this embodiment, the steel beam 20 has a beam depth and beam width of 900 mm x 300 mm. The steel beam 20 is composed of a steel beam end portion 21 constituting a part of the column-beam joint precast concrete member 5, and a steel beam center portion 22 connected to the steel beam end portion 21. The steel beam 20 has a longer allowable strength than the composite structural beam 30. For this reason, as shown in FIG. 3, a small beam 50 is disposed at a predetermined interval between the steel beams 20, 20. Note that in FIG. 3, the beam spans of the steel beam 20 and the composite structural beam 30 are shown to be equal, but in this embodiment, the beam span of the steel beam 20 is 10.5 m, and the beam span of the composite structural beam 30 is 9.5 m.

[0018] As shown in Figs. 1(a), (b) and 3, the composite beam 30 is composed of a composite beam end 31 constituting a part of the beam-column joint precast concrete member 5 and a steel beam central portion 39 connected to the composite beam end 31. The composite beam end 31 constituting the material end of the composite beam 30 is composed of a steel beam end 32 of an H-shaped steel arranged in a direction intersecting with the steel beam 20, and a reinforced concrete beam 33 formed by pouring concrete to cover the upper end of the column 11 and the upper end side of the other steel beam end 32 integrally with the upper end of the column 11 and the upper end side of the column 11 of the steel beam end 32 while ensuring the covering thickness of the upper end reinforcement 34 and the lower end reinforcement 35. The upper end side of the column 11 of the steel beam end 32 does not contact the column 10 in a plan view, and is connected to the steel beam 20 and the column 10 via the reinforced concrete beam 33 and the beam intersection 40. In this embodiment, the upper end side of the column body 11 of the steel beam end 32 is disposed at a distance D1 of about 500 mm from the steel beam 20 and at a distance D2 of about 200 mm from the column 10. The steel beam end 32 and the steel beam center 39 have a beam depth and width of 800 mm x 300 mm. The reinforced concrete beam 33 has a beam depth and width of 1200 mm x 600 mm and a beam length of 2000 mm. The upper end reinforcement 34 and the lower end reinforcement 35 are arranged in the reinforced concrete beam 33. Anchoring hardware 38 is attached to the ends of the upper end reinforcement 34 and the lower end reinforcement 35. Stirrup reinforcements 36 are arranged at a predetermined interval to surround the upper end reinforcement 34 and the lower end reinforcement 35, and at the end 37, the intervals are narrowed to reinforce the reinforced concrete beam 33 near the end 37. The length of the reinforced concrete beam 33 is preferably 1.5 to 3 times the length of the steel beam whose longitudinal ends are covered with reinforced concrete.

[0019] 2(a) and (b), in the precast concrete member 5 for a column-beam joint, composite structural beam ends 31 extend from two parallel faces of a beam intersection 40 having the same planar dimensions as the column cross section of the column 10, and steel beam ends 21 extend from the other two parallel faces, and the composite structural beam ends 31 and the steel beam ends 21 are connected via the beam intersection 40. In the beam intersection 40, the hoops 13 are arranged by penetrating the webs 23 of the steel beam ends 21 at the height where the steel beam ends 21 are arranged. The beam intersection 40 has insertion holes 15 through which the column main reinforcements 12 of the column 10 are inserted.

[0020] The precast concrete beam-column joint member 5 is used for the beam-column joint structure 1 of an interior column in which the steel beam end 21 and the composite beam end 31 extend in two directions. The precast concrete beam-column joint member 6 shown in FIG. 4(a) is used for the beam-column joint structure 2 of an outer periphery column in which the steel beam end 21 extends in only one direction (the steel beam end does not extend from end face A) (FIG. 3). The precast concrete beam-column joint member 7 shown in FIG. 4(b) is used for the beam-column joint structure 3 of an outer periphery column in which the composite beam end 31 extends in only one direction (the composite beam end does not extend from end face B). The precast concrete beam-column joint member 8 shown in FIG. 4(c) is used for the beam-column joint structure 4 of an exterior corner column in which the steel beam end 21 and the composite beam end 31 extend in only one direction (the steel beam end does not extend from end face A, and the composite beam end does not extend from end face B).

[0021] (Composition of column-beam joint structure 1) As shown in Fig. 1(a) and (b), in the beam-column joint structure 1, the composite structural beams 30, 30 are connected at their longitudinal ends to the beam width direction end of the steel beam 20 through the beam intersection 40 placed on the column body 11 of the column 10. Upper end reinforcement 34 and lower end reinforcement 35 are arranged at predetermined intervals from the inside of the reinforced concrete beam 33 at the longitudinal end of one composite structural beam 30 to the inside of the beam intersection 40 at the top of the column body 11 through the top and bottom of the flange of the steel beam 20 to the inside of the reinforced concrete beam 33 at the longitudinal end of the other composite structural beam 30. After the reinforcing bars are arranged, concrete is poured integrally from the longitudinal end of one composite structural beam 30 through the top of the column body 11 to the longitudinal end of the other composite structural beam 30, thereby forming the beam-column joint structure 1 integrally.

[0022] As described above, according to the beam-column joint structure 1 of this embodiment, the steel beam central parts 22, 39 are bolted to the beam-column joint precast concrete member 5, the column main reinforcement 12 is inserted into the insertion hole 15, and then grout is injected to easily construct a rigid frame structure. In addition, by using precast concrete members, large-scale temporary members are not required, and construction time and costs can be reduced. In the beam-column joint structure 1, since there is no steel beam at the end in the longitudinal direction of the composite structural beam 30 where the bending moment is large, the design moment of the central steel part is small, and the cross section of the steel beam end part 32 and the steel beam central part 39 can be made small, thereby reducing costs. In addition, since the steel beam ends 21, 32 are all single material and each member length is short, costs can be significantly reduced, and delivery to the precast factory and stocking in the factory are easy. Furthermore, the length of the steel beam end 21 in the material axis direction of the precast concrete column-beam joint member 5 is sufficiently shorter than the width of the loading platform of the transport truck or trailer, so that it is easy to transport to the site and transportation efficiency can be improved. In addition, since welding between steel beams is not required, it is possible to process steel materials without using S-grade or H-grade fabricators that require advanced technology, which reduces costs. Furthermore, since the steel beam end 32 is not embedded in the column 10 in a plan view, when arranging the column main reinforcement 12, it is only necessary to arrange it by avoiding the steel beam end 21 without considering the arrangement of the steel beam end 32. This increases the degree of freedom in the arrangement of the column main reinforcement 12 compared to a structure in which steel beams in both directions are joined on the column, improving workability and shortening the construction time. In this way, the precast concrete column-beam joint member 5 and the column-beam joint structure 1 can provide a precast concrete column-beam joint member and a column-beam joint structure suitable for a column-beam joint structure between a steel beam and a reinforced concrete column.

[0023] [Second embodiment] 5(a) and (b) show a column-beam joint structure 1 using a column-beam joint precast concrete member 9 according to the second embodiment of the present invention. The column-beam joint precast concrete member 9 is a half precast concrete member, and the concrete of the composite structure beam end 31 is poured only up to the upper surface of the steel beam top end 32a of the steel beam end 32, which is different from the first embodiment in that the post-cast concrete 60 is poured at the site after the column-beam joint precast concrete member 9 is placed on the upper end of the column 11. In the column-beam joint precast concrete member 9, the concrete is poured only up to the upper end of the steel beam end 32 at the factory, so that the upper part of the stirrup bar 36 protrudes (exposed) from a height equal to the upper end of the steel beam end 32 (the upper end of the reinforced concrete beam 33). In addition, the upper end bar 34 is also exposed to the outside while being surrounded by the stirrup bar 36 in the part other than the beam intersection 40.

[0024] (Composition of column-beam joint structure 1) 5(a) and (b), in the beam-column joint structure 1, after placing a precast concrete member 9 for a beam-column joint on a column 11, a central part 39 of the steel beam is connected to an end part 32 of the steel beam, and a central part 22 of the steel beam is connected to an end part 21 of the steel beam via a splice plate. Reinforcement for a floor slab (not shown) is arranged on the reinforced concrete beam 33, and post-cast concrete 60 is poured integrally on the floor slab and the upper part of the composite structural beam 30. The strength of the post-cast concrete 60 is lower than the concrete compressive strength of the reinforced concrete beam 33 and is equal to the compressive strength of the slab concrete used for the floor slab provided on the reinforced concrete beam 33.

[0025] According to the column-beam joint structure 1 of this embodiment, the column-beam joint precast concrete member 9 is lighter than the column-beam joint precast concrete member 5, so that the column-beam joint precast concrete member 9 can be easily transported. This allows the size of the lifting machine to be reduced, and costs to be reduced. In addition, since the post-cast concrete 60 is cast on-site together with the floor slab, construction time and labor can be reduced, and since the compressive strength of the post-cast concrete 60 is lower than the compressive strength of the reinforced concrete beam 33, costs can be reduced. Therefore, the column-beam joint precast concrete member 9 and the column-beam joint structure 1 can provide a column-beam joint precast concrete member and a column-beam joint structure suitable for a column-beam joint structure between a steel beam and a reinforced concrete column.

[0026] [Variations] In the above first and second embodiments, one end of the steel beam end 32 is separated from the column 10 by a distance D2, but the surface of the column 10 and the steel beam end 32 may be in contact (D2=0).

[0027] In the above first and second embodiments, the pillar 10 is a cast-in-place reinforced concrete pillar, but it may be a reinforced concrete pillar such as a precast concrete pillar or a half-precast concrete pillar.

[0028] In the above first and second embodiments, the beam-column joint precast concrete members 5-9 have insertion holes 15 formed at the beam intersections 40 through which the column main reinforcements 12 of the column 10 are inserted, and the column main reinforcements 12 of the column 10 protrude upward, but for example, the column main reinforcements may protrude upward and downward from the beam intersections, and mechanical joints or the like may be provided at the upper and lower ends of the columns to be joined to the column main reinforcements at the beam intersections. Alternatively, the column main reinforcements may protrude upward at both the beam intersections and the columns, and mechanical joints or the like may be provided below to join the column main reinforcements to each other.

[0029] In the above first and second embodiments, the composite structural beam ends 31, 31 are connected via one steel beam central portion 39, but they may be connected via two or more steel beam central portions.

[0030] In the above second embodiment, the upper end reinforcement 34 and stirrup reinforcement 36 were exposed from the upper end of the concrete poured up to the steel beam end 32 of the composite structural beam end 31 of the column-beam joint precast concrete member 9, but the exposed upper end reinforcement and stirrup reinforcement may be attached, for example, by a mechanical joint, after the column-beam joint precast concrete member is placed on the column 10.

[0031] In addition, in the first embodiment, the precast concrete members 5 to 8 for the column-beam joints were precast concrete members, but in cases where it is necessary to reduce the weight of the members, for example, they may be half precast members in which the concrete beam cross section excluding the tip is U-shaped. The precast concrete member 9 for the column-beam joints in the second embodiment may also be a half precast member in which the concrete beam cross section excluding the tip is U-shaped and the upper stirrup reinforcement is exposed.

[0032] The present invention is not limited to the above-described embodiment, and various modifications are possible within the scope of the claims. In other words, the technical scope of the present invention also includes embodiments obtained by combining technical means that are appropriately modified within the scope of the claims. [Explanation of symbols]

[0033] 1,2,3,4 Column-beam joint structure 5,6,7,8,9 Precast concrete beam-column joints 10 Reinforced concrete pillar (column) 11 Column 12 Column main reinforcement 13 Stirrup 15 Insertion hole 20 Steel Beam 21,32 Steel beam end 22,39 Center of steel beam 30 Composite structural beam 31 Composite structure beam end 32a Steel beam top 33 Reinforced concrete beam 34 Upper end muscle 35 Bottom reinforcement 36 Stirrup muscle 40 Beam intersection 50 Small beam 60 Post-cast concrete

Claims

1. A precast concrete member used for a column-beam joint structure between a composite structural beam consisting of a first steel beam at the center of a reinforced concrete beam at the end of the member, a second steel beam erected in a direction intersecting the first steel beam, and a reinforced concrete column, Among the second steel beams, a steel beam end portion of the second steel beam supported on an upper portion of the reinforced concrete column; A composite structure beam end in which one end of the steel beam end of the first steel beam in the longitudinal direction is arranged at a predetermined interval from the steel beam end of the second steel beam; A beam intersection in which concrete is poured integrally with the composite structural beam end at least up to the height of the steel beam top end of the steel beam end of the first steel beam, the composite structural beam end and the steel beam end of the second steel beam are joined, and an insertion hole through which the column main reinforcement of the reinforced concrete column can be inserted is formed; Equipped with A precast concrete member for a beam-column joint.

2. The other first steel beam has a longitudinal end portion facing the composite structural beam across the beam intersection portion and disposed at a predetermined interval from the steel beam end portion of the second steel beam. Concrete is poured from the composite structural beam end to the other composite structural beam end via the beam intersection, at least up to the height of the steel beam top end of the steel beam end of the first steel beam. The precast concrete beam-column joint component according to claim 1.

3. The beam depth of the first steel beam is smaller than the beam depth of the second steel beam. The precast concrete beam-column joint component according to claim 1.

4. The beam depth of the first steel beam is smaller than the beam depth of the second steel beam. The precast concrete beam-column joint component according to claim 2.

5. A precast concrete member for a beam-column joint according to any one of claims 1 to 4, The reinforced concrete column in which the column main reinforcement is inserted into the insertion hole; having Column-beam joint structure.

6. The post-cast concrete poured on the top of the concrete at the end of the composite structural beam has a lower strength than the concrete; The column-beam joint structure according to claim 5.

Images