JP2014109152A - Beam member and floor structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a beam member that reduces construction costs and is made lightweight while preventing a sectional defect.SOLUTION: A beam member 10 includes a precast concrete-made bottom part 11 which is made by half precasting, and a side form 12 which is provided at the bottom part 11 and covers a side face of a binder 4. A cross rail 22 which extends substantially horizontally is provided at an upper end edge of the side form 12. Concrete is cast on the bottom part 11. The prevent invention can make the beam member 10 lightweight since only the bottom part 11 is made of precast concrete. Further, a sectional defect of the binder 4 can be prevented since an end edge of a floor member 50 never enters a structure cross section, and construction costs are reducible since the need for a conventional increasing section is eliminated.

Description

  The present invention relates to a beam member and a floor structure constructed using the beam member.

  Conventionally, in the construction site of a building, in order to support the concrete formwork of a floor or a beam, a formwork support work is provided. However, since much cost is required for assembling and dismantling the formwork support work, the use of a precast concrete member has made it possible to minimize the formwork support work.

For example, a structure in which a precast concrete beam member (hereinafter referred to as a PCa beam) is installed between columns or between beams is known (see Patent Document 1).
Specifically, the beam member is a reinforced concrete flat plate and a precast member in which a side mold is fixed to the PCa beam built on the concrete plate and concrete is placed on the PCa beam. According to such a beam member, the workability at the construction site can be improved by reducing the weight of the precast member.

By the way, in this case, it is necessary to place the edge of the floor discard form on the side edge of the PCa beam and to support the floor discard form such as a deck plate on the PCa beam.
However, in the structure as shown in Patent Document 1, there is a problem that the end edge of the floor formwork reaches the structure cross section of the PCa beam, resulting in a cross-sectional defect of the beam. In order to solve this problem, the following structure has been proposed.

For example, a method has been proposed in which a bracket is temporarily fixed to a side surface of a PCa beam with a bolt, and an end edge of a floor disposal formwork is placed on the bracket and supported (see Patent Document 2).
Further, a PCa beam having a substantially U-shaped cross section (half PCa beam) is used to provide a non-structural additional striking portion by covering the side wall portion of the PCa beam. A method of placing an edge has been proposed (see Patent Document 3).

  In this way, since the end edge of the floor formwork is supported by the bracket or the additional hitting portion, it is possible to avoid a cross-sectional defect of the PCa beam structure.

Japanese Patent Laid-Open No. 9-78690 JP 2001-288893 A JP-A-6-341167

However, in the PCa beam as in Patent Documents 2 and 3, in order to attach a bracket or provide an increased hitting portion, the side wall portion of the PCa beam also needs to be constructed of precast concrete. Therefore, there is a problem that the weight of the PCa beam is increased, and a large crane is required for transporting and mounting the PCa beam.
In addition, when the increased hitting portion is provided on the side wall portion of the PCa beam, not only the weight of the PCa beam is increased, but also an extra reinforcing material and concrete for constructing the increased hitting portion are required, and the construction cost is increased. There was a problem of increasing.

  An object of this invention is to provide the beam member and floor structure which can implement | achieve reduction of construction cost and weight reduction, preventing a cross-sectional defect | deletion.

  The beam member according to claim 1 (for example, a beam member 10 to be described later) is a half-precast beam member, and precast concrete having recesses (for example, a recess 17 to be described later) formed on both end faces in the axial direction. A bottom part (for example, a bottom part 11 described later) and a side mold (for example, a side mold 12 described later) provided on the bottom and covering a side surface of the beam, and an upper edge of the side mold Is provided with a horizontal rail (for example, a horizontal rail 22 described later) extending substantially horizontally, and concrete is placed on the bottom.

  The floor structure according to claim 2 includes the above-described beam member, and a floor member (for example, a floor member 50 described later) that is installed on the beam member to construct a floor (for example, a floor 5 described later), The beam main bar on the lower side of the beam member does not protrude from the end surface of the bottom portion, and the edge of the floor member is placed on a horizontal beam of the side frame of the beam member. And supported by the beam member.

  The floor structure according to claim 3, wherein the floor member is any one of a discarded frame (for example, a steel plate 51 described later), a precast concrete flat plate member, and a deck plate that covers the bottom surface of the floor. And a reinforcing bar material (for example, a reinforcing bar material 52 described later).

According to the present invention, since the floor structure is constructed using the beam member and the floor member, the formwork supporting work for supporting the formwork of the beam and the floor can be reduced as much as possible, and the construction period can be shortened.
In addition, since the beam member is configured to include the bottom and the side mold and only the bottom is made of precast concrete, the beam member can be reduced in weight. Therefore, it is not necessary to use a large crane for transporting and mounting the beam member as in the prior art.
In addition, since the edge of the discarded form frame of the floor member is placed on the horizontal rail of the side form of the beam member and the floor member is supported by the beam member, the edge of the discarded form frame does not enter the cross section of the structure. In addition to preventing the cross-sectional defect of the beam, it is possible to reduce the construction cost because the additional striking part as in the prior art becomes unnecessary.
In addition, since the recesses are provided on both axial end surfaces of the bottom, when the concrete is cast and the bottom is integrated with other beams and columns, this recess functions as a shacotter and shear force during an earthquake. Can resist enough.

  According to the present invention, since the floor structure is constructed using the beam member and the floor member, the formwork supporting work for supporting the formwork of the beam and the floor can be reduced as much as possible, and the construction period can be shortened. In addition, since the beam member is configured to include the bottom and the side mold and only the bottom is made of precast concrete, the beam member can be reduced in weight. Therefore, it is not necessary to use a large crane for transporting and mounting the beam member as in the prior art. In addition, since the edge of the discarded form frame of the floor member is placed on the horizontal rail of the side form of the beam member and the floor member is supported by the beam member, the edge of the discarded form frame does not enter the cross section of the structure. In addition to preventing the cross-sectional defect of the beam, it is possible to reduce the construction cost because the additional striking part as in the prior art becomes unnecessary. In addition, since the recesses are provided on both axial end surfaces of the bottom, when the concrete is cast and the bottom is integrated with other beams and columns, this recess functions as a shacotter and shear force during an earthquake. Can resist enough.

It is a top view of the floor structure concerning one embodiment of the present invention. It is sectional drawing of the small beam part of the floor structure which concerns on the said embodiment. It is AA sectional drawing of FIG.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a top view of a floor structure 1 according to an embodiment of the present invention.
The floor structure 1 includes a large beam 3 laid between pillars 2, a small beam 4 laid between the large beams 3, a floor 5 laid between the large beam 3 and the small beam 4, Is provided.

FIG. 2 is a cross-sectional view of the beam portion of the floor structure. FIG. 3 is a cross-sectional view taken along the line AA of FIG.
The small beam 4 is constructed using a beam member 10 made of half-precast. The beam member 10 includes a bottom 11 made of precast concrete, and a side mold 12 provided on the bottom 11 and covering a side surface of the small beam 4.
Further, the beam member 10 includes an upper beam main bar 13, a lower beam main bar 14, and rectangular frame-shaped stirrups (shears) provided at predetermined intervals so as to surround the upper and lower beam main bars 13, 14. Reinforcing bars) 15. The end hook of the stirrup 15 is disposed on the lower side.

  The bottom part 11 is driven with the lower part of the lower beam main bar 14 and the stirrup bar 15, and is further driven with a separator 16 extending in the beam width direction. As a result, the end hooks of the ribs 15 are also driven into the bottom 11.

Moreover, the edge part of the lower beam main reinforcement 14 is bend | folded upwards, and the extra length part of the lower beam main reinforcement 14 is stored in the bottom part 11 of a precast concrete structure. Therefore, the lower beam main bar 14 does not protrude from both axial end surfaces of the bottom 11.
The reason why the lower beam main reinforcement 14 does not protrude from both end faces of the bottom 11 is as follows. That is, the small beam 4 is not a member that resists shearing against a horizontal load generated when an earthquake occurs. Therefore, the end of the small beam 4 may be pin-joined to the large beam 3, and the beam main bar 14 below the small beam 4. This is because it is not necessary to fix to the beam 3.

Further, concave portions 17 are formed in two upper and lower stages on both axial end surfaces of the bottom portion 11. As shown in FIG. 3, the recess 17 is a recess provided above the bottom surface of the bottom 11.
In addition, not only this but the recessed part 17 may be made to reach the bottom face of the bottom part 11, and the loss | missing of the corner | angular part at the time of conveyance and attachment of the beam member 10 may be prevented.
Further, a lifting hook 18 is driven into the bottom portion 11, and an upper portion of the lifting hook 18 is exposed on the upper surface of the bottom portion 11.

  The side formwork 12 includes a pair of wooden panel members 20 that cover the side surfaces of the beam 4, a fixing mechanism 30 that fixes a lower portion of the pair of panel members 20 to the bottom 11, and an upper portion of the pair of panel members 20. A coupling mechanism 40 for coupling.

  The panel material 20 includes a plate material 21, a horizontal beam 22 provided at the upper and lower ends of the plate material 21 and extending in a substantially horizontal direction, and a vertical beam 23 provided in the plate material 21 at predetermined intervals in the horizontal direction and extending in a substantially vertical direction. And comprising.

  The fixing mechanism 30 is provided on the outside of the plate member 21 of the panel member 20, and is connected to a square pipe 31 as a long member extending substantially horizontally along the axial direction of the bottom portion 11, and a P-component connected to the separator 16 of the bottom portion 11 32 and a foam tie (registered trademark) 33 that is connected to the P-con 32 and fastens the square pipe 31 to the plate member 21. That is, the foam tie 33 is connected to the bottom 11 via the P-con 32 and the separator 16.

  The connection mechanism 40 includes a single pipe 41 provided outside the vertical rail 23 of the panel material 20 and extending substantially horizontally, a P-con 42 provided inside the plate member 21, and a separator 43 that connects the P-con 42 to each other. And a foam tie 44 that is connected to the P-con 42 and fastens the single tube 41 to the plate 21.

The floor 5 is constructed using a plurality of floor members 50 having a predetermined width. That is, a plurality of floor members 50 are laid between the large beam 3 and the small beam 4 (see FIG. 1). Each floor member 50 includes a steel plate 51 that serves as a discarded mold that covers the bottom surface of the floor 5, and a reinforcing bar member 52 that is provided integrally with the steel plate 51.
The reinforcing bar member 52 includes an upper main bar 53, a suspension member 54 provided on the steel plate 51 to support the upper main bar 53, a lower main bar 55 provided immediately below the upper main bar, an upper main bar 53 and a lower main bar 55. And a lattice material 56 for connecting the two.

  The edge of the steel plate 51 of the floor member 50 is placed on and supported by the horizontal rail 22 on the upper side of the side mold frame 12, and in this state, is fixed to the horizontal rail 22 with a nail 57.

The small beam 4 and the floor 5 are constructed by the following procedure using the beam member 10 and the floor member 50 described above.
First, in a state where the upper beam main bar 13 is not arranged on the beam member 10, a wire (not shown) is connected to the lifting hook 18 and lifted by a crane, and the beam member 10 is installed between the large beams 3.
Next, the floor member 50 is installed between the large beam 3 and the beam member 10. At this time, the edge of the steel plate 51 of the floor member 50 is placed on the horizontal rail 22 on the upper side of the side mold frame 12 and fixed with nails 57.
Next, the upper beam main bar 13 is arranged, and concrete is placed up to a height indicated by a broken line in FIG. As a result, concrete is placed on the bottom 11 and the beam member 10 is integrated with the large beam 3.
After the concrete curing period has elapsed, the side mold 12 is disassembled. Here, even if the side mold 12 is disassembled, the steel plate 51 does not fall because the steel plate 51 is supported by the concrete frame via the reinforcing bars 52.

According to this embodiment, there are the following effects.
(1) Since the floor structure 1 is constructed using the beam member 10 and the floor member 50, the formwork supporting work for supporting the formwork of the small beam 4 and the floor 5 can be reduced as much as possible, and the construction period can be shortened.
In addition, since the beam member 10 includes the bottom portion 11 and the side mold 12 and only the bottom portion 11 is made of precast concrete, the beam member 10 can be reduced in weight. Therefore, it is not necessary to use a large crane for transporting and mounting the beam member as in the prior art.
Further, since the edge of the steel plate 51 of the floor member 50 is placed on the horizontal rail 22 of the side mold 12 of the beam member 10 and the floor member 50 is supported by the beam member 10, the edge of the floor member 50 is a structure. Since it does not enter the cross section, it is possible to prevent the cross section of the small beam 4 from being lost and to eliminate the need for an additional hitting portion as in the prior art, thereby reducing construction costs.
Further, since the concave portions 17 are provided on both end surfaces of the bottom portion 11 in the axial direction, when the concrete is cast and the bottom portion 11 is integrated with the large beam 3, the concave portion 17 functions as a shacotter. Engage with the girder 3 to sufficiently resist the shear force during an earthquake.

  (2) Since the end hook of the stirrup is placed on the lower side and driven into the bottom 11 in advance, the end hook is prevented from obstructing the bar arrangement when the upper beam main bar 13 is arranged. it can.

  (3) While fixing the lower part of a pair of panel material 20 to the bottom part 11 with the fixing mechanism 30, the connection mechanism 40 connected the upper part of a pair of panel material 20 mutually. Therefore, even if the side pressure acting on the panel material 20 is increased by the post-cast concrete, it is possible to prevent the side mold 12 from being squeezed out.

It should be noted that the present invention is not limited to the above-described embodiment, and modifications, improvements, etc. within a scope that can achieve the object of the present invention are included in the present invention.
For example, in the present embodiment, the present invention is applied to the small beam 4 to form the beam member 10, but the present invention is not limited thereto, and the present invention may be applied to the large beam 3.
Moreover, in this embodiment, although the steel plate 51 was used as a discarding formwork, it is not restricted to this, You may use the flat member made from precast concrete, or a deck plate.

DESCRIPTION OF SYMBOLS 1 ... Floor structure 2 ... Pillar 3 ... Large beam 4 ... Small beam 5 ... Floor 10 ... Beam member 11 ... Bottom part 12 ... Side frame 13 ... Upper beam main reinforcement 14 ... Lower beam main reinforcement 15 ... Spiral reinforcement 16 ... Separator 17 ... Recess 18 ... Lifting hook 20 ... Panel material 21 ... Plate material 22 ... Horizontal beam 23 ... Vertical beam 30 ... Fixing mechanism 31 ... Square pipe 32 ... P-con 33 ... Form tie 40 ... Connecting mechanism 41 ... Single pipe 42 ... P-con 43 ... Separator 44 ... Form tie 50 ... Floor member 51 ... Steel plate (discarded formwork)
52 ... Reinforcement material 53 ... Upper main reinforcement 54 ... Suspension material 55 ... Lower main reinforcement 56 ... Lattice material 57 ... Nail

Claims (3)

A half-precast beam member,
A bottom part of a precast concrete structure in which recesses are formed on both end faces in the axial direction, and a side mold provided on the bottom part to cover the side surface of the beam,
A lateral rail extending substantially horizontally is provided at the upper edge of the side mold,
A beam member, wherein concrete is placed on the bottom. A floor structure comprising the beam member according to claim 1 and a floor member constructed on the beam member to construct a floor,
The beam main bar below the beam member does not protrude from the end surface of the bottom,
The floor structure is characterized in that an end edge of the floor member is placed on a horizontal rail of a side mold of the beam member and supported by the beam member.   The said floor member is provided with any one of a steel plate, a precast concrete flat plate-like member, and a deck plate as a discarded mold that covers the bottom surface of the floor, and a reinforcing bar material. Floor structure as described in.

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