JP2014055443A - Precast concrete wall and column-beam joint structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a precast concrete wall that enables a beam to be provided directly above the precast concrete wall without separate provision of a support member for supporting the beam during the construction of the beam, and a column-beam joint structure.SOLUTION: In a precast concrete wall 30 having an upper frame part 33 for supporting a beam 50, the upper frame part 33 is configured so that the thickness-direction thickness of the precast concrete wall 30 can be greater than the thickness-direction thickness of the beam 50 and so that an outer surface of the upper frame part 33 can be positioned on the thickness-direction outside with respect to an outer surface of the beam 50 in a state in which the beam 50 is installed on the upper frame part 33.

Description

  The present invention relates to a precast concrete wall and a joint structure between a column and a beam.

  In recent years, in a reinforced concrete building, a precast concrete member in which members such as columns, beams, walls, etc. are commercialized in advance at a factory or the like is often used. As a result, the work of arranging bars and placing concrete at the construction site is reduced, so that the construction period can be shortened.

  As such a precast concrete member, a pair of front and back wall plates disposed between wall thickness separations, a connecting member for connecting the pair of wall plates, and a part of the wall plate at the upper part thereof A hollow precast concrete member for a wall comprising a beam member composed of a stirrup bar and a main beam bar has been proposed (see Patent Document 1 below).

  According to the above-mentioned hollow precast concrete member for a wall, since the wall and the beam are integrally formed of precast concrete, it is possible to shorten the construction period at the building site.

JP-A-8-144402

  Here, for reasons such as design planning, the outer surface of the wall may be arranged with the position shifted inward in the wall thickness direction from the outer surface of the beam. In this case, the hollow precast concrete member for a wall described in Patent Document 1 has a wall plate that is flush with the beam from the wall to the beam. Therefore, the hollow precast concrete member for a wall cannot be used.

  In addition, when constructing beams placed on the outer periphery of the building at the construction site, it is difficult to secure a place to install the concrete formwork to be placed on the beam. Even if it is possible, it is difficult to secure a place to install a support member for preventing the beam from falling down until the concrete is solidified, and there is a problem that workability is poor.

  Therefore, the present invention has been made in view of the above circumstances, and precast concrete which can be provided directly on a precast concrete wall without providing a support member for supporting the beam during construction of the beam. Provide a wall and a joint structure between a column and a beam.

In order to achieve the above object, the present invention employs the following means.
That is, the precast concrete wall according to the present invention is a precast concrete wall having an upper frame portion that supports a beam, and the upper frame portion has a thickness in the thickness direction of the precast concrete wall that is the thickness of the beam. The outer surface of the upper frame portion is positioned on the outer side in the thickness direction with respect to the outer surface of the beam in a state where the beam is installed on the upper frame portion. It is characterized by being.

  In such a precast concrete wall, the outer surface of the upper frame portion supporting the beam is arranged on the outer side in the thickness direction of the precast concrete wall than the outer surface of the beam. The load of the beam can be supported by the upper frame portion. Therefore, the beam can be provided immediately above the precast concrete wall without separately providing a support member for supporting the beam during the construction of the beam.

  The precast concrete wall according to the present invention includes a lower frame portion facing the upper frame portion, and a connecting portion connecting the lower frame portion and the upper frame portion, and the connection. It is preferable that the part is provided directly below the beam via the upper frame part.

  In such a precast concrete wall, during the construction of the beam, the connecting portion can support the concrete load placed inside the beam. Therefore, the beam can be provided immediately above the precast concrete wall without separately providing a support member for supporting the beam during the construction of the beam.

  Moreover, the precast concrete wall which concerns on this invention may be provided with the opening part penetrated to the said thickness direction at the said precast concrete wall.

  In such a precast concrete wall, even when the precast concrete wall has an opening, the rigidity as the precast concrete wall can be ensured by the upper frame portion and the connecting portion.

  Further, the column / beam connection structure according to the present invention includes a precast concrete wall according to any one of the above, a pair of columns erected from a floor, and a part disposed between the pair of columns. Is a joint structure of a column and a beam provided with the beam made of precast concrete, and the pair of columns has a support portion for supporting a width direction end portion of the precast concrete wall, and the precast The concrete wall has a supported portion supported by the supporting portion.

  In such a joint structure between a column and a beam, the support portion supports the supported portion, so that the load of the beam can be reliably supported by the column.

  Further, in the junction structure between a column and a beam according to the present invention, the support portion is a recess formed on a surface facing the precast concrete wall, and the supported portion is formed on a surface facing the column. The convex part made may be sufficient.

  In such a joint structure between a column and a beam, the column can reliably support the beam by being integrated with a simple structure in which the concave portion and the convex portion are combined.

  Further, in the joint structure of a column and a beam according to the present invention, a first gap is formed between the precast concrete wall and the column, and a second gap is formed between the precast concrete wall and the floor. May be.

In such a joint structure between a column and a beam, the beam and the precast concrete wall are integrated by placing concrete on the beam at the construction site, so that the beam bears the load of the precast concrete wall. In addition, the column can bear the load of the precast concrete wall through the beam.
Furthermore, the first and second gaps are provided between the precast concrete wall and the column and between the precast concrete wall and the floor, respectively. And can follow the vertical deformation.

  According to the precast concrete wall and the joint structure of a column and a beam according to the present invention, the outer surface of the upper frame portion supporting the beam is arranged on the outer side in the thickness direction than the outer surface of the beam. When doing so, the load of the beam can be supported. Therefore, the beam can be provided immediately above the precast concrete wall without separately providing a support member for supporting the beam during the construction of the beam.

It is the figure which looked at the state which decomposed | disassembled the pillar and beam periphery of a building provided with the junction structure of the pillar and beam which concern on one Embodiment of this invention from the exterior of this building. It is the figure which looked at the state which decomposed | disassembled the pillar and beam periphery of the building provided with the junction structure of the pillar and beam which concern on one Embodiment of this invention from the inside of this building. It is a longitudinal cross-sectional view of the pillar of a building provided with the junction structure of the pillar and beam which concerns on one Embodiment of this invention, and a beam periphery. It is a top view of a pillar and a precast concrete wall part in a junction structure of a pillar and a beam concerning one embodiment of the present invention. In the junction structure of the pillar and beam concerning one embodiment of the present invention, it is a schematic front view of a pillar and a precast concrete wall part. It is the enlarged view which looked at the state which decomposed | disassembled the pillar and beam periphery of a building provided with the junction structure of the pillar and beam which concern on the modification of one Embodiment of this invention from the exterior of this building. It is a top view of a pillar and a precast concrete wall part in a junction structure of a pillar and a beam concerning a modification of one embodiment of the present invention.

A joint structure 1 (hereinafter simply referred to as “joint structure 1”) between a column 10 and a beam 50 according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram of a state in which members around a column 10 and a beam 50 in a reinforced concrete building 2 are disassembled, viewed from the outside of the building 2, and FIG. 2 is a diagram viewed from the inside of the building 2. It is.
Here, the external side of the building 2 is simply referred to as “external side”, the indoor side of the building 2 and simply “indoor side”, and the extending direction of the beam 50 is simply referred to as “extended direction”.

  As shown in FIG. 1 and FIG. 2, the joint structure 1 that joins the pillar 10 and the beam 50 is provided across a pair of pillars 10 and 10 erected from the floor F and between the pair of pillars 10 and 10. A wall (precast concrete wall) 30 and a beam 50 arranged between the pair of columns 10 and 10.

  The column 10 is configured as a precast concrete member, and is formed of concrete filled with a plurality of column main bars 11 arranged in the vertical direction and the plurality of column main bars 11 and band bars (not shown). It has a column concrete part 12. Further, the plurality of column main bars 11 protrude upward from the upper end 12 a of the column concrete portion 12.

  A concave portion 19 (support portion) that supports an end portion of the wall 30 in the width direction (extending direction) is formed on the surface of the column concrete portion 12 that faces the wall 30.

  The concave portion 19 is directed downward from the upper end 12a of the column concrete portion 12 of the column 10, and is cut out from the indoor side end portion 12b of the column concrete portion 12 toward the outside, and is formed in a substantially rectangular shape in side view. Yes.

  A large beam 20 is provided on the top of the column 10 in a direction from the outside to the room.

  The girder 20 is configured as a precast concrete member, and is formed of a first rebar 21 formed of a plurality of reinforcing bars extending from the outside toward the indoor side, and a plurality of rebars disposed along the extending direction. A second reinforcing bar 22 and a large beam concrete portion 23 formed of concrete so as to cover the first reinforcing bar 21, the second reinforcing bar 22 and the heel bar (not shown).

  A second bar 22 protrudes from the side surface of the large beam concrete portion 23, and a plurality of holes 24 are formed in the large beam concrete portion 23 in the vertical direction.

  The hole 24 is inserted through a portion of the column main bar 11 protruding upward from the column concrete portion 12 and filled with a filler (not shown) so that the column 10 and the large beam. 20 is joined.

  Next, the wall 30 is configured as a precast concrete member, and includes an upper frame portion 33 that supports the beam 50, a lower frame portion 34 that faces the upper frame portion 33, and the upper frame portion 33 and the lower frame portion 34. It has the some vertical frame part 35 and the connection part 36 which connect. The upper frame portion 33, the lower frame portion 34, the vertical frame portion 35, and the connecting portion 36 are constituted by a wall concrete portion 32 whose surface is formed of concrete.

  In the upper frame portion 33, a plurality of vertical bars 31 protrude above the wall concrete portion 32 from the upper surface thereof.

  A portion surrounded by the upper frame portion 33, the lower frame portion 34, and the pair of vertical frame portions 35 is an opening portion 37 penetrating in the thickness direction of the wall 30. In the present embodiment, two openings 37 are formed apart from each other in the extending direction.

  As shown in FIG. 3, the thickness in the thickness direction of the walls of the upper frame portion 33 and the lower frame portion 34 is larger than the thickness of the vertical frame portion 35. Further, the outer surface 33X of the upper frame part 33 and the outer surface 34X of the lower frame part 34 are located on the outer side (thickness direction outer side) than the outer surface 50X of the beam 50.

  As shown in FIGS. 1 and 2, a convex portion 39 (supported portion) supported by the concave portion 19 of the column 10 is formed on the surface of the upper frame portion 33 facing the column 10.

  As shown in FIG. 4, the convex portion 39 has a shape corresponding to the concave portion 19 of the column 10, and moves from the indoor side to the outside side of the upper frame portion 33 and from the inner side to the outer side in the extending direction of the upper frame portion 33. It is formed so as to protrude.

  Moreover, as shown in FIG. 3, the vertical frame part 35 has connected the indoor side of the upper frame part 33 and the lower frame part 34, respectively. The outer sides of the upper frame portion 33 and the lower frame portion 34 are extended portions 38 a and 38 b that extend outward from the vertical frame portion 35.

  The connecting portion 36 connects the extending portion 38a of the upper frame portion 33 and the extending portion 38b of the lower frame portion 34 in the vertical direction. Further, the connecting portion 36 is provided directly below the beam 50 with the upper frame portion 33 interposed therebetween, so that it is possible to receive the load of the beam 50 via the upper frame portion 33 and support the beam 50. Has been.

  Further, as shown in FIG. 5, a first gap 41 is formed between the vertical frame portion 35 disposed opposite to the column 10 and the column 10 among the plurality of vertical frame portions 35, and the lower frame portion 34. A second gap 42 is formed between the floor F and the floor F.

  Next, as shown in FIG. 1 and FIG. 2, the beam 50 has a rectangular shape in cross-section so as to cover a plurality of beam main bars 51 arranged along the extending direction and the outer circumferences of the plurality of beam main bars 51. And the outer surface material 53 which is disposed on the outer side of the beam reinforcement bar 52 and formed of concrete. The beam main reinforcement 51, the beam reinforcement 52, and the outer surface material 53 are integrally configured as a precast concrete member.

Here, the length in the width direction of the outer surface material 53 is longer than the length in the width direction of the beam main bar 51, and the end of the outer surface material 53 in the extending direction is longer than the end of the beam main bar 51 in the extending direction when viewed from the front. The part is formed to protrude on both sides.
Further, the joining members 55 are inserted in advance at both ends in the extending direction of the plurality of beam main reinforcing bars 51. This joining member 55 is a tubular member, is inserted so as to be movable in the extending direction with respect to the beam main reinforcing bar 51, and is used when the beam main reinforcing bar 51 and the second bar 22 of the large beam 20 are connected later. is there.

  As shown in FIGS. 1 and 2, the beam 50 further includes a beam main bar 51, a beam barb 52, and a vertical wall 30 arranged between the beam bar 51 and the beam barb 52 at the construction site. It has an on-site concrete portion 55 (see FIG. 3) filled with concrete so as to cover the bars 31 and the second bars 22 of the girder 20. By the in-situ concrete portion 55, the beam 50 and the wall 30 and the beam 50 and the large beam 20 are integrated and joined.

Next, the construction procedure of the joint structure 1 between the column 10 and the beam 50 configured as described above will be described.
First, a pair of pillars 10 and 10 are erected on the floor F, and a convex part 39 formed on the upper frame part 33 of the wall 30 is engaged with the concave part 19 formed on the pillar 10 to thereby form a pair of pillars. A wall 30 is disposed between the ten and ten. At this time, a temporary member 43 (see FIG. 5) for supporting the load of the wall 30 is provided in the second gap 42 formed between the lower frame portion 34 of the wall 30 and the floor.

  Next, the column main reinforcement 11 of the column 10 is inserted into the hole 24 formed in the large beam 20, the large beam 20 is provided in the upper part of the column 10, and the hole 24 is filled with a filler to fill the column 10 and the large beam. 20 is joined.

  Next, the beam 50 is provided on the wall 30 such that the outer surface material 53 of the beam 50 is disposed on the upper frame portion 33 of the wall 30. At this time, the vertical bars 31 of the wall 30 are inserted and arranged between the plurality of beam main bars 51 of the beam 50 and between the plurality of beam barbs 52.

  Further, the plurality of beam main bars 51 of the beam 50 and the second bar 22 of the large beam 20 are arranged to face each other, and the joining member 55 provided at the end of the beam main bar 51 is moved to the second bar 22 side. As a result, the beam main reinforcement 51 and the second reinforcement 22 are arranged to face each other inside the joining member 55. Then, for example, by fastening both ends of the joining member 55 with nuts (not shown) or injecting a grout material (not shown) into the joining member 55, the main beam 51 and the main beam 51 are connected via the joining member 55. The two bars 22 are joined.

  Next, a formwork (not shown) is provided on the indoor side of the beam 50, and concrete is placed so as to cover the beam main bar 51 and the beam barb 52 to form the on-site concrete portion 55. The beam 50 and the large beam 20 are joined. Thereafter, after the concrete is hardened, the temporary member 43 provided below the lower frame portion 34 of the wall 30 is removed.

  In the wall 30 and the joint structure 1 configured as described above, the outer surface 33X of the upper frame portion 33 that supports the beam 50 protrudes outward from the outer surface 50X of the beam 50. When installing 50, the load of the beam 50 can be supported by the upper frame portion 33. Therefore, the beam 50 can be provided immediately above the wall 30 without separately providing a support member for supporting the beam 50 during the construction of the beam 50.

  Further, during the construction of the beam 50, the connecting portion 36 can support the load of concrete placed so as to cover the beam main reinforcement 51 and the beam reinforcement 52 of the beam 50. Furthermore, the wall 30 and the column 10 are integrated with a simple configuration in which the convex portion 39 formed on the upper frame portion 33 of the wall 30 and the concave portion 19 formed on the column 10 are engaged, so that the beam 50 is integrated. The column 10 can reliably support the load of the concrete placed on the column. Therefore, since the beam 50 can be provided immediately above the wall 30 without separately providing a support member for supporting the beam 50 during the construction of the beam 50, the cost can be reduced and the construction period can be shortened by reducing the support member. Can do.

  In particular, when the beam 50 is provided on the wall 30 arranged on the outer peripheral side of the building 2, it is difficult to secure a place for providing a support member that supports the beam 50, and thus this embodiment is adopted. Therefore, the safety during construction can be improved.

  Further, when placing concrete so as to cover the beam main reinforcement 51 and the beam reinforcement 52 of the beam 50 at the construction site, the upper surface of the upper frame portion 33 plays a role of a concrete bottom frame. Therefore, since it is not necessary to provide a separate bottom frame, the members can be omitted and the number of construction steps can be reduced.

  In addition, since the concrete is placed on the beam 50, the beam 50 and the wall 30 are integrated, so that the beam 50 can bear the load of the wall 30 and the column 10 is connected via the beam 50. The load of the wall 30 can be borne.

  Moreover, when the temporary member 43 provided under the lower frame portion 34 after the construction is removed, a second gap 42 is formed between the wall 30 and the floor F, and between the wall 30 and the column 10. Since the first gap 41 is formed, for example, during an earthquake, the wall 30 is separated from the column 10 and the floor F, and can follow horizontal deformation and vertical deformation.

  Further, the out-of-plane rigidity of the wall 30 can be improved by making the upper frame portion 33 thicker than the vertical frame portion 35 in the wall 30 thickness direction. Furthermore, the out-of-plane rigidity of the wall 30 can also be improved by the connecting portion 36.

  Even when the wall 30 has the opening 37, the upper frame portion 33 and the connecting portion 36 can ensure the rigidity as the wall 30.

  Moreover, since the connection part 36 is provided in the outer side rather than the vertical frame part 35, the external appearance design property of the building 2 can be improved by the connection part 36. FIG.

(Modification)
As a modification of the embodiment described above, as shown in FIGS. 6 and 7, the upper frame portion 133 of the wall 130 protrudes outward in the extending direction from the vertical frame portion 35, thereby forming a convex portion 139. It may be.

  That is, the upper frame portion 133 of the wall 130 protrudes outward in the extending direction from the vertical frame portion 35, and this protruding portion constitutes the convex portion 139. The concave portion 119 of the column 110 supports the convex portion 139.

  In the wall 130 and the joint structure 101 configured as described above, the convex portion 139 can be formed by merely projecting the upper frame portion 133 of the wall 130 outward in the extending direction from the vertical frame portion 35. While the manufacture of the portion 139 is simple, the pillar 110 can reliably support the concrete load placed on the beam 50. Therefore, the beam 50 can be provided immediately above the wall 130 without separately providing a support member for supporting the beam 50 during the construction of the beam 50.

  It should be noted that the assembly procedure shown in the above-described embodiment, or the shapes and combinations of the constituent members are examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

  For example, the vertical frame portion 35 of the connecting portion 36 may be provided on the indoor side, and in this case, a simple appearance with less unevenness can be achieved.

  Further, even when the connection portion 36 is not provided, the upper frame portion 33 can support the load of the beam 50, so that a support member for supporting the beam 50 is not provided separately during the construction of the beam 50. The beam 50 can be provided immediately above the wall 30.

  Further, the first gap 41 is not formed between the wall 30 and the column 10, and the second gap 42 may not be formed between the wall 30 and the floor F.

DESCRIPTION OF SYMBOLS 1 ... Joining structure of a column and a beam 10 ... Column 19 ... Recessed part (support part)
30 ... wall (precast concrete wall)
33 ... Upper frame part 34 ... Lower frame part 36 ... Connection part 37 ... Opening part 39 ... Convex part (supported part)
41 ... first gap 42 ... second gap 50 ... beam F ... floor

Claims (6)

A precast concrete wall having an upper frame for supporting the beam,
The upper frame portion has a thickness in the thickness direction of the precast concrete wall larger than a thickness in the thickness direction of the beam, and the upper frame portion is installed in a state where the beam is installed on the upper frame portion. A precast concrete wall configured such that an outer surface is located on an outer side in the thickness direction than an outer surface of the beam. The precast concrete wall according to claim 1,
The precast concrete wall has a lower frame portion that faces the upper frame portion, and a connecting portion that connects the lower frame portion and the upper frame portion,
The precast concrete wall, wherein the connecting portion is provided directly below the beam via the upper frame portion. In the precast concrete wall according to claim 1 or 2,
The precast concrete wall is provided with an opening penetrating in the thickness direction in the precast concrete wall. The precast concrete wall according to any one of claims 1 to 3,
A pair of pillars erected from the floor;
A column-to-beam junction structure comprising the beam arranged between the pair of columns and partly composed of precast concrete,
The pair of columns has a support portion for supporting a width direction end portion of the precast concrete wall,
The precast concrete wall has a supported part supported by the supporting part, and a column / beam connection structure. In the junction structure of the pillar and beam according to claim 4,
The support portion is a recess formed on a surface facing the precast concrete wall,
The support structure is a protrusion formed on a surface facing the column, and the column / beam connection structure. In the junction structure of a pillar and a beam according to claim 4 or claim 5,
A structure for joining a column and a beam, wherein a first gap is formed between the precast concrete wall and the column, and a second gap is formed between the precast concrete wall and the floor. .

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