JP7264690B2 - METHOD FOR MANUFACTURING CONCRETE WALL STRUCTURE AND BUILDING STRUCTURE - Google Patents

Description

The present invention relates to a concrete wall structure, a method for making a concrete wall structure, and a building structure.

In Patent Document 1, a crack-inducing joint structure of concrete in which mortar is filled in a portion where a crack-inducing joint is generated and a mortar filling space portion is provided by a lath frame in a concrete placing formwork, and concrete is provided in addition to the mortar filling space portion. A method for constructing a crack-inducing joint structure of concrete is disclosed in which the mortar is filled into the mortar-filled space by flowing mortar from the concrete into the mortar-filled space.

Japanese Patent Application Laid-Open No. 2008-38360

However, there is a possibility that crack-inducing joints cannot sufficiently function with the above-described conventional technique.

The present invention provides a concrete wall structure, a method for producing the concrete wall structure, and a building structure that easily exhibits a crack-inducing function in a crack-inducing joint.

In order to solve the above problems, the concrete wall structure of the present invention is a concrete wall structure in which a concrete wall is provided on a foundation, and a first vertical crack-inducing joint formed in the concrete wall. and a second crack-inducing joint formed in the thickness direction of the concrete wall on the upper side of the first crack-inducing joint, and embedded in the concrete wall along the extending direction of the concrete wall, and a horizontal bar formed with a discontinuity at a location crossing the first crack-inducing joint and the second crack-inducing joint.

With the above configuration, a discontinuous portion of the horizontal muscle is formed at a portion crossing the first crack-inducing joint, so cracks are likely to occur in the first crack-inducing joint and the second crack-inducing joint.

A plurality of the horizontal muscles are embedded at intervals in the vertical direction, and for some or all of the horizontal muscles other than the uppermost horizontal muscle, at the location where the first crack-inducing joint and the second crack-inducing joint are crossed. A discontinuity may be formed. According to this, cracks are likely to occur in the first crack-inducing joint and the second crack-inducing joint, and the influence of the discontinuity of the horizontal bars can be reduced.

A plurality of the horizontal stripes may be embedded at intervals in the vertical direction, and discontinuous portions may be formed in all of the horizontal stripes at locations crossing the first crack-inducing joint and the second crack-inducing joint. According to this, the crack inducing force becomes higher in the first crack-inducing joint and the second crack-inducing joint.

The second crack-inducing joint is formed in a concave groove shape, and the concave shape may change from the outdoor side to the indoor side of the concrete wall.

The concrete wall may be a concrete spandrel provided on a foundation beam as the foundation.

The method for producing a concrete wall structure according to the present invention comprises the steps of: fixing a joint bar for forming the second crack-inducing joint to the lower part of the lowest horizontal beam of an outer wall frame of a building; forming the discontinuity by attaching to the longitudinal bars protruding from the crosspieces; fabricating the formwork with the transverse bars and longitudinal bars positioned inside; positioning the joint bar in the formwork; and pouring concrete into the formwork.

According to the above method, the second crack-inducing joint is formed because the concrete placed in the formwork cannot exist at the location of the joint bar. Then, the second crack-inducing joint can be efficiently produced even when the work of attaching the outer wall frame of the building to the pillars or the like is carried out at the site and the concrete spandrel wall is manufactured later under the outer wall frame.

In the above method, the joint bar may have a lateral projection length from the horizontal beam, and the joint bar may be used to position the indoor-side formwork plate of the formwork. . This facilitates the accurate fabrication of the formwork.

In the above method, a spacer may be attached near the edge of the horizontal reinforcement forming the discontinuous portion to ensure the covering thickness of the concrete spandrel. According to this, at the discontinuous portion of the horizontal reinforcement, the thickness of the concrete cover can be ensured accurately, and the influence of the discontinuous portion can be reduced.

Further, in the building structure of the present invention, the concrete wall is a concrete spandrel wall provided on the foundation beam as the foundation, and a joint bar is fixed to the lower part of the lowest horizontal beam of the outer wall frame of the building. and wherein the joint bar is embedded in the upper part of the concrete spandrel to form the second crack-inducing joint.

According to the present invention, cracks are more likely to occur at the first crack-inducing joint and the second crack-inducing joint.

FIG. 2 is a perspective explanatory view showing the concrete wall structure of this embodiment; FIG. 1 is a perspective plan view showing a portion of the concrete wall structure; FIG. It is explanatory drawing which showed the construction method of the concrete wall structure of this embodiment. It is explanatory drawing which showed the construction method of the concrete wall structure of this embodiment. It is explanatory drawing which showed the construction method of the concrete wall structure of this embodiment.

An embodiment according to one aspect of the present invention will be described below with reference to the accompanying drawings. As shown in FIGS. 1 and 2 , the concrete wall structure of this embodiment comprises a concrete spandrel 1 on foundation beams 70 .

The concrete waist wall 1 is formed in the thickness direction of the concrete waist wall 1 on the upper side of the first crack-inducing joint 11 formed on the outdoor side and the indoor side and the first crack-inducing joint 11 in the vertical direction. and a second crack-inducing joint 12 . The second crack-inducing joint 12 is connected to the first crack-inducing joint 11 on the outdoor side and the indoor side. In addition, a structure in which at least one of the first crack-inducing joint 11 and the second crack-inducing joint 12 is formed may be used. In this case, it is desirable to form the first crack-inducing joint 11 preferentially on the outdoor side.

Further, the concrete spandrel 1 has a plurality of vertical bars 21 protruding above the foundation beam 70 and extending in the height direction of the concrete spandrel 1 at intervals in the extension direction of the concrete spandrel 1. . Further, the concrete spandrel 1 is provided with, for example, two horizontal bars 22 extending in the extension direction of the concrete spandrel 1 and vertically spaced apart.

Of the two horizontal reinforcements 22 , the lower horizontal reinforcement 22 has a discontinuous portion G at a location crossing the first crack-inducing joint 11 and the second crack-inducing joint 12 . This discontinuous portion G can be formed, for example, by passing a long reinforcing bar and connecting it to the vertical reinforcing bar 21 with a binding wire, and then cutting it using, for example, cutting scissors. Of course, the discontinuous portion G is not limited to the cutting as described above, and a short reinforcing bar is used. It can also be formed by connecting to 21 with a binding wire.

The length of the discontinuous portion G, that is, the distance between the ends of the adjacent horizontal stripes 22 is, for example, approximately 100 mm, but is not limited to such a length. Further, the fore-side portion of each of the adjacent horizontal reinforcements 22 is connected to the vertical reinforcement 21 provided near the fore-end by a binding line. Further, in the vicinity of the edge of the horizontal reinforcement 22, the number of vertical reinforcements 21 may be increased for reinforcement. In addition, the position of the vicinity of the fore edge connected to the vertical stripe 21 is set within 50 mm from the edge of the horizontal stripe 22, for example.

Further, in this embodiment, of the two horizontal reinforcements 22, the upper horizontal reinforcement 22, which serves as the top reinforcement, extends through a long reinforcing bar to the upper end side of the vertical reinforcement 21, as in general reinforcement arrangement. connected with a tie line. In this structure, the horizontal reinforcements 22 other than the uppermost horizontal reinforcement 22 have the discontinuity G described above. In addition, in the structure in which three or more horizontal stripes 22 are present, a structure in which a part or all of the horizontal stripes 22 other than the horizontal stripes 22 positioned at the uppermost side have the discontinuous portion G can be employed. Alternatively, the horizontal stripes 22 serving as the top stripes may also have the discontinuous portions G, or all the horizontal stripes 22 including the top stripes may have the discontinuous portions G.

With the above configuration, the discontinuous portion G of the horizontal muscle 22 is formed at the location crossing the first crack-inducing joint 11 and the second crack-inducing joint 12, so that the first crack-inducing joint 11 and the second crack-inducing joint 12 are formed. 2. Cracking of concrete is more likely to occur at crack-inducing joints 12 .

If the discontinuous portion G is formed in some or all of the horizontal reinforcements 22 other than the uppermost horizontal reinforcement 22, cracks will occur in the first crack-inducing joints 11 and the second crack-inducing joints 12. It is possible to reduce the influence of the discontinuity of the horizontal stripes 22 while making it easier.

When the discontinuous portions G are formed for all of the plurality of horizontal muscles, the crack inducing force in the first crack-inducing joint 11 and the second crack-inducing joint 12 becomes higher.

The shapes of the first crack-inducing joint 11 and the second crack-inducing joint 12 are not limited. For example, the concave groove forming the second crack-inducing joint 12 may have a shape that becomes sharper toward the indoor side of the concrete spandrel 1 (the concave groove gradually becomes shallower toward the indoor side). Moreover, it is good also as a shape in which a concave groove becomes shallower toward the center side of the wall thickness direction of the concrete waist wall 1. As shown in FIG. Further, the recessed groove forming the second crack-inducing joint 12 may be formed halfway in the thickness direction of the concrete spandrel 1 . In addition, expansion bodies may be provided in the first crack-inducing joint 11 and the second crack-inducing joint 12 . As this expansive body, for example, a filler containing expansive material for concrete as a main component can be used.

Next, an example of a method of manufacturing the above-mentioned concrete spandrel 1 will be described with reference to FIGS. 3 to 7. FIG. This manufacturing method example includes the step of fixing a joint bar 31 for forming the second crack-inducing joint 12 to the lower part of the furring strip 51 of the building (the lowermost horizontal beam of the outer wall frame 50). For example, at the stage of producing the furring strip 51 or at the stage of producing the outer wall frame 50 using the furring strip 51 , the joint bar 31 is welded to the lower end of the furring strip 51 in a factory. Further, the joint bar 31 is subjected to rust prevention treatment. Then, at the construction site, the outer wall frame 50 is lifted by a crane or the like, and the outer wall frame 50 is fixed with bolts or the like to the pillars 55 (see FIGS. 4 and 5) or beams that are the skeleton of the building. As the joint bar 31, a reinforcing bar or a hardware can be used.

Further, in this embodiment, the foundation beam 70 has already been produced at the construction site, and the vertical reinforcement 21 of the concrete spandrel 1 protrudes from the foundation beam 70 . A field worker connects the horizontal reinforcement 22 to the vertical reinforcement 21 . Then, the discontinuous portion G is produced at the location of the horizontal stripe 22 below the joint bar 31 .

Then, the formwork 61 is produced by the indoor formwork board 61a and the outdoor formwork board 61b so that the horizontal reinforcement 22 and the vertical reinforcement 21 are positioned inside. Further, in the production of the formwork 61 , the lower part of the furring strip 51 is positioned on the upper side inside the formwork 61 and the jointer bar 31 is positioned inside the formwork 61 . After the formwork 61 is completely manufactured, concrete is poured into the formwork 61 . In addition, a joint bar 32 for forming the first crack-inducing joint 11 is provided on the indoor-side form plate 61a and the outdoor-side form plate 61b.

In addition, the length of the joint rod 31 protruding in the lateral direction from the furring strip 51 is set to a predetermined length, and in the production of the formwork 61, the joint rod 31 is used to position the indoor-side form plate 61a. conduct.

Further, in the production of the formwork 61, a spacer 20 for securing the cover thickness of the concrete spandrel 1 is attached near the edge of the lateral reinforcement 22 forming the discontinuous portion G. As shown in FIG. In particular, when a discontinuous portion G is provided in the horizontal reinforcement 22 serving as the top reinforcement, it is preferable to attach the spacer 20 in the vicinity of the discontinuous portion G of the horizontal reinforcement 22 on the lower side. In addition, the above-mentioned neighborhood is, for example, within 200 mm from the edge of the horizontal stripe 22 .

According to the above-described manufacturing method, the second crack-inducing joint 12 is formed because the concrete placed in the formwork 61 cannot exist at the location of the joint bar 31 . Then, even when the steel frame erection method proceeds with the work of attaching the furring strips 51 of the outer wall frame 50 to, for example, the pillars 55 at the site, and the concrete spandrel wall 1 is manufactured below the furring strips 51 later, the above-mentioned second 2 Crack-inducing joints 12 can be produced efficiently.

In the above method, positioning the indoor-side formwork plate 61a in the formwork 61 with the jointer 31 facilitates the accurate production of the formwork 61. As shown in FIG.

Further, in the above method, if the spacer 20 is attached near the discontinuous portion G, the thickness of the concrete cover can be secured at the discontinuous portion G, and the influence of the discontinuous portion G can be reduced.

In addition, the building structure of this embodiment has the above-mentioned concrete spandrel 1 fabricated on the above-mentioned foundation beam 70, and a jointer 31 is fixed to the lower part of furring strip 51 of the building, and the jointer 31 is It has a structure in which the second crack-inducing joint 12 is embedded in the upper part of the concrete waist wall 1 . In the building, an outer wall plate is arranged above the concrete waist wall 1, and a drain is provided between the outer wall plate and the concrete waist wall 1 to hide the joint bar 31.

Note that the concrete wall is not limited to a concrete spandrel wall, and may be a concrete fence or a concrete retaining wall. In addition, the above concrete wall can be applied regardless of bearing strength or non-bearing strength.

Although the embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited to the illustrated embodiments. Various modifications and variations can be made to the illustrated embodiment within the same scope as the present invention or within an equivalent scope.

1 : Concrete waist wall 11 : First crack-inducing joint 12 : Second crack-inducing joint 20 : Spacer 21 : Vertical bar 22 : Horizontal bar 31 : Jointer 32 : Jointer 50 : Exterior wall frame 51 : Furring edge lower berth)
55: Column 61: Formwork 61a: Indoor-side formwork board 61b: Outdoor-side formwork board 70: Foundation beam (foundation)
G: discontinuous point

Claims (7)

A concrete waist wall is provided on the foundation beam, and a first vertical crack-inducing joint formed in the concrete waist wall and a thickness direction of the concrete waist wall on the upper side of the first crack-inducing joint The formed second crack-inducing joint and the concrete spandrel wall are embedded along the extension direction of the concrete spandrel wall, and are uneven at locations crossing the first crack-inducing joint and the second crack-inducing joint. A method for fabricating a concrete spandrel structure comprising a horizontal reinforcement formed with a continuous portion, the method comprising:
A step of fixing a joint bar for forming the second crack-inducing joint to the lower part of the lowest horizontal beam of the outer wall frame of the building; forming a formwork with the horizontal and vertical bars positioned inside; positioning the lower side of the horizontal beam on the upper side of the formwork and inserting the joint bar into the form A method of fabricating a concrete spandrel structure, comprising the steps of positioning within a frame and placing concrete within said formwork. 2. The method for manufacturing a concrete spandrel wall structure according to claim 1, wherein a length of lateral projection of said joint bar from said horizontal beam is a predetermined length, and said joint bar extends the indoor side of said formwork. A method for producing a concrete spandrel structure, comprising positioning a form plate . 3. The method for fabricating a concrete spandrel structure according to claim 1 or claim 2, characterized in that spacers are attached to secure the cover thickness of the concrete spandrel in the vicinity of the edge of the lateral reinforcement forming the discontinuous portion. A method for producing a concrete waist wall structure . A concrete waist wall is provided on the foundation beam, and a first vertical crack-inducing joint formed in the concrete waist wall and a thickness direction of the concrete waist wall on the upper side of the first crack-inducing joint The formed second crack-inducing joint and the concrete spandrel wall are embedded along the extension direction of the concrete spandrel wall, and are uneven at locations crossing the first crack-inducing joint and the second crack-inducing joint. and a horizontal bar formed with a continuous portion, wherein a joint bar is fixed to the lower part of the lowest horizontal bar of the outer wall frame of the building, and the joint bar is attached to the upper part of the concrete spandrel wall. A building structure characterized in that the second crack-inducing joint is formed by embedding . In the building structure according to claim 4, a plurality of the horizontal reinforcements are embedded at intervals in the vertical direction, and for some or all of the horizontal reinforcements other than the uppermost horizontal reinforcement, the first crack-inducing joint and A building structure, wherein a discontinuity is formed at a location across the second crack-inducing joint . In the building structure according to claim 4 or 5, a plurality of the horizontal muscles are embedded at intervals in the vertical direction, and the first crack-inducing joints and the second crack-inducing joints are formed for all the horizontal muscles. A building structure characterized in that a discontinuity is formed at a crossing point . In the building structure according to any one of claims 4 to 6, the second crack-inducing joint is formed in a concave groove shape, and the concave groove shape extends from the outdoor side of the concrete waist wall. A building structure characterized by a change toward the indoor side .

Images