Precast concrete member and sheath

Abstract

To enable reinforcing material insertion holes extending in different directions to be arranged close to each other while suppressing a decrease in the filling property of a filler.SOLUTION: A joint member 5, which is a precast concrete member, has a plurality of column bar insertion holes 8Z extending in a first direction (vertical direction) and a plurality of X-direction beam bar insertion holes 8X extending in a second direction (X direction) different from the first direction and arranged adjacent to the column bar insertion holes 8Z. At least one of the column bar insertion holes 8Z and the X-direction beam bar insertion holes 8X has a short flat cross-sectional shape in the X-direction, which is the proximity direction, at least in a portion adjacent to the other of the column bar insertion holes 8Z and the X-direction beam bar insertion holes 8X.SELECTED DRAWING: Figure 7

Description

Technical Field

[0001] The present invention relates to a precast concrete member in which reinforcing bar insertion holes extending in two directions intersecting each other are formed, and a sheath (sheathing pipe) for forming reinforcing bar insertion holes extending in two directions intersecting each other in the concrete member.

Background Art

[0002] Precast concrete members may be used to construct a ramen structure made of reinforced concrete. Generally, on the connection end face of a precast concrete member, reinforcing bars to be connected to other members protrude, or reinforcing bar receiving holes filled with grout (filler) in a state of receiving the reinforcing bars are formed.

[0003] Patent Document 1 discloses a structure of a column-beam joint portion capable of joining precast beam members to a precast column member in two directions or four directions. When two beam members are arranged on both sides of the column-beam joint member, a horizontal hole through which the main beam reinforcement passes is formed in the column-beam joint member, a mechanical filling joint is embedded in both beam members, and an insertion hole is formed from the end of the beam member to the joint. When beam members are provided in four directions of the column-beam joint member, horizontal holes penetrating in two directions in plan view are formed in the column-beam joint member. These horizontal holes penetrating the column-beam joint member in the horizontal direction are constituted by a plurality of sheaths made of steel pipes. The inner diameter of the sheath is larger than the diameter of the main beam reinforcement, and a spiral groove is formed on the inner peripheral surface thereof. A filler is filled in the gap between the inner peripheral surface of the sheath and the main beam reinforcement inserted into the sheath.

[0004] Patent Document 2 discloses a precast concrete member in which a horizontal through hole for inserting the main beam reinforcement and a vertical through hole for inserting the main column reinforcement are formed in a joint panel portion (column-beam joint member) forming a part of the column.

Prior Art Documents

Patent Documents

[0005] Patent Document 1 Japanese Patent Application Laid-Open No. 2021-55472 Patent Document 2 Japanese Patent Application Laid-Open No. 2006-22494 Summary of the Invention Problems to be Solved by the Invention

[0006] However, in the technique described in Patent Document 1, since the horizontal holes that intersect in plan view are formed by sheaths arranged so as to overlap in the vertical direction, they are offset in the vertical direction by approximately the diameter of the sheath. Therefore, a part of the main beam reinforcement is arranged at a position away from the upper or lower surface of the beam.

[0007] Also, in the precast member described in Patent Document 1, the sheaths for the column main reinforcement and the sheaths for the beam main reinforcement are arranged so as to overlap in the horizontal direction. Therefore, the column main reinforcement and the beam main reinforcement are offset in the horizontal direction by approximately the diameter of the sheath (specifically, the sum of the radius of the sheath for the column main reinforcement and the radius of the sheath for the beam main reinforcement).

[0008] When a plurality of reinforcing bar insertion holes extending in different directions are formed in a precast member, even if the reinforcing bars themselves can be arranged, the reinforcing bar insertion holes cannot be arranged close to each other, so it may be necessary to enlarge the member cross-section during design. Although it is conceivable to reduce the inner diameter of the sheath in order to avoid increasing the size of the member cross-section, doing so makes it difficult to fill the filling material into the reinforcing bar insertion holes.

[0009] In addition, the same applies when using reinforcing bars made by processing carbon fiber, aramid fiber, glass fiber, etc. instead of reinforcing bars, and there are similar problems in all the reinforcing bar insertion holes. Also, the same problem occurs when forming tension member insertion holes for inserting tension members such as PC steel bars and PC steel wire into precast members. Hereinafter, in this specification, the reinforcing bars and the tension members for reinforcement are collectively referred to as reinforcing materials, and the holes for inserting the reinforcing materials are referred to as reinforcing material insertion holes.

[0010] In view of the above background, an object of the present invention is to provide a precast concrete member capable of arranging reinforcing member insertion holes extending in different directions close to each other while suppressing a decrease in the fillability of a filler, and a sheath capable of manufacturing the same.

Means for Solving the Problems

[0011] In order to solve the above problems, an aspect of the present invention is a precast concrete member (5), which has a plurality of first reinforcing member insertion holes (8Z) extending in a first direction, and a plurality of second reinforcing member insertion holes (8X, 8Y) extending in a second direction different from the first direction and arranged close to the first reinforcing member insertion holes, and at least one of the first reinforcing member insertion holes and the second reinforcing member insertion holes has a short flat cross-sectional shape in a direction close to the other of the first reinforcing member insertion holes and the second reinforcing member insertion holes in a portion close to the other.

[0012] According to this aspect, it becomes possible to arrange the first reinforcing member insertion hole and the second reinforcing member insertion hole close to each other. Thereby, an increase in the size of the member cross section can be suppressed. Further, in the vicinity of both the reinforcing member insertion holes, since the cross section of the reinforcing member insertion hole is a short flat shape in the proximity direction, the space for the filler between the inner surface of the reinforcing member insertion hole and the outer surface of the reinforcing member becomes large, and a decrease in the fillability of the filler is suppressed.

[0013] In the above aspect, it is preferable that the reinforcing members (4a, 6a) inserted into one of the first reinforcing member insertion holes and the second reinforcing member insertion holes have a short flat cross-sectional shape in the proximity direction.

[0014] According to this aspect, compared with the case where the reinforcing member has a circular cross-sectional shape, the filling space between the inner surface of the reinforcing member insertion hole and the outer surface of the reinforcing member becomes larger, and a decrease in the fillability of the filler is more suppressed.

[0015] In the above aspect, it is preferable that the short dimension direction of one of the first reinforcing member insertion holes and the second reinforcing member insertion holes is the same as the short dimension direction of the reinforcing member.

[0016] According to this aspect, compared with the case where the reinforcing member has a circular cross-sectional shape, the shortest distance between the inner surface of the reinforcing member insertion hole and the outer surface of the reinforcing member becomes larger. Therefore, a decrease in the fillability of the filler is further suppressed.

[0017] In the above aspect, it is preferable that one of the first reinforcing member insertion hole and the second reinforcing member insertion hole has a flat cross-sectional shape over the entire length.

[0018] According to this aspect, it is not necessary to align the longitudinal position of one of the first reinforcing member insertion hole and the second reinforcing member insertion hole with the position of the other. Therefore, it is easy to form both reinforcing member insertion holes.

[0019] In the above aspect, it is preferable that both the first reinforcing member insertion hole and the second reinforcing member insertion hole have a short flat cross-sectional shape in the proximity direction at least in a portion where they are close to each other.

[0020] According to this aspect, the first reinforcing member insertion hole and the second reinforcing member insertion hole can be arranged closer to each other. Thereby, an increase in the size of the member cross-section can be effectively suppressed.

[0021] In the above aspect, it is preferable that the flat cross-sectional shape is an elliptical shape, an oblong shape, or a oval shape.

[0022] According to this aspect, since there are no recesses or corners in the cross-section of the reinforcing member insertion hole, the filler is easily filled over the entire cross-section of the reinforcing member insertion hole.

[0023] In the above aspect, it is preferable that at least one of the first reinforcing member insertion hole and the second reinforcing member insertion hole is formed by a sheath (10).

[0024] According to this aspect, the first reinforcing member insertion hole and the second reinforcing member insertion hole can be arranged close to each other without being communicated.

[0025] In the above aspect, it is preferable that the first direction and the second direction include a vertical direction and a horizontal direction.

[0026] According to this aspect, the column main reinforcement bars and the beam main reinforcement bars can be arranged horizontally in proximity to each other.

[0027] In order to solve the above problems, an aspect of the present invention is a sheath (10B) for forming a reinforcing material insertion hole (8(8X, 8Y, 8Z)) in a concrete member (5), which has a non-circular flat cross-sectional shape in at least a part of the longitudinal direction.

[0028] According to this aspect, it becomes possible to arrange the portion having the flat cross-sectional shape of the sheath in proximity to the position of another reinforcing material insertion hole extending in a direction different from the extending direction of the sheath. Thereby, an increase in the member cross-section can be suppressed. Further, in the flat cross-sectional shape portion of the reinforcing material insertion hole defined by the sheath, since the cross-section is flat, the space for the filling material between the inner surface of the reinforcing material insertion hole and the outer surface of the reinforcing material becomes large, and a decrease in the filling property of the filling material is suppressed.

Advantages of the Invention

[0029] According to the above aspect, it is possible to provide a precast concrete member capable of arranging reinforcing materials extending in different directions in proximity to each other while suppressing a decrease in the filling property of the filling material, and a sheath capable of manufacturing the same.

Brief Description of the Drawings

[0030]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Mode for Carrying Out the Invention

[0031] Hereinafter, some embodiments of the present invention will be described in detail with reference to the drawings.

[0032] ≪First Embodiment≫ First, the first embodiment of the present invention will be described with reference to FIGS. 1 to 7. FIG. 1 is an exploded perspective view of a building 1 using a precast member according to the first embodiment. The building 1 is a multi-story building with a ramen structure, and has a plurality of columns 2 arranged in the X direction and the Y direction orthogonal to each other on a horizontal plane, and beams 3 (3X, 3Y) connecting two adjacent columns 2 in the X direction and the Y direction. The column 2 has a square cross-sectional shape, and in this embodiment, it has a square cross-sectional shape. The beam 3 has a vertically long rectangular cross-sectional shape. The beam 3 includes an X-direction beam 3X extending in the X direction and a Y-direction beam 3Y (see FIG. 3) extending in the Y direction. Hereinafter, when not distinguishing between the two, they are collectively referred to as the beam 3.

[0033] The columns 2 and the beams 3 are made of reinforced concrete (RC) and are each composed of one or more precast concrete members (hereinafter referred to as precast members) having a predetermined length. The first-floor portion of the column 2 is composed of a column main body 4 which is a precast member and a joint member 5 joined to the upper surface of the column main body 4. The beam 3 is composed of beam members 6 (6X, 6Y) which are precast members having a length equal to the separation distance between the corresponding columns 2. Specifically, the X-direction beam 3X is composed of an X-direction beam member 6X having a length equal to the X-direction separation distance between the columns 2. The Y-direction beam 3Y is composed of a Y-direction beam member 6Y having a length equal to the Y-direction separation distance between the columns 2. Hereinafter, when not distinguishing between the two, they are collectively referred to as the beam member 6. Both ends of the beam member 6 are joined to the corresponding joint members 5. In other embodiments, the joint member 5 may integrally include the ends of at least one beam 3, and the length of the beam member 6 may be shorter than the column spacing.

[0034] The column main body 4 includes a plurality of column main reinforcement bars 4a extending downward from the lower surface. On the upper surface of the column main body 4, column reinforcement receiving holes 4b for receiving the column main reinforcement bars 4a of the precast column member arranged above are formed. A plurality of mechanical joints 7 (see FIG. 4) for connecting these column main reinforcement bars 4a to its own column main reinforcement bars 4a are embedded in the upper part of the column main body 4. In the illustrated example, the column main reinforcement bars 4a are arranged in a single row annularly along the outer periphery of the column main body 4. In other embodiments, the column main reinforcement bars 4a may be arranged in two rows along at least a part of the outer surface.

[0035] The beam member 6 includes a plurality of beam main reinforcement bars 6a extending from one end face to one side. On the other end face of the beam member 6, beam reinforcement receiving holes 6b (see FIG. 3) for receiving the beam main reinforcement bars 6a of the beam member 6 arranged adjacent to the other side are formed. A plurality of mechanical joints 7 (see FIG. 3) for connecting these beam main reinforcement bars 6a to its own beam main reinforcement bars 6a are embedded in the other end of the beam member 6. In the illustrated example, the beam main reinforcement bars 6a are arranged in one row each in the upper and lower directions. In other embodiments, the beam main reinforcement bars 6a may be arranged in a plurality of rows in at least one of the upper and lower parts.

[0036] FIG. 2 is a perspective view of the doorway member 5. As shown in FIGS. 1 and 2, in the doorway member 5, a plurality of X-direction beam bar insertion holes 8X extending in the Y direction, a plurality of Y-direction beam bar insertion holes 8Y extending in the X direction, and a plurality of column bar insertion holes 8Z extending in the vertical direction are formed. Hereinafter, these are collectively referred to as, or when not distinguishing them, the reinforcing bar insertion holes 8. Note that the reinforcing bar insertion holes 8 are an example of the reinforcing material insertion holes, and the column main bars 4a and the beam main bars 6a are examples of the reinforcing bars and the reinforcing materials. Further, the column bar insertion holes 8Z are an example of the first reinforcing material insertion holes, and the X-direction beam bar insertion holes 8X and the Y-direction beam bar insertion holes 8Y are examples of the second reinforcing material insertion holes.

[0037] FIG. 3 is a plan sectional view of the doorway portion of the building 1. Note that although the beam main bars 6a are deformed bars, they are shown as round steel in FIGS. 3 and 4. As shown in FIG. 3, the X-direction beam bar insertion holes 8X are for inserting the beam main bars 6a of the X-direction beam member 6X, and are arranged at positions aligned with the corresponding beam main bars 6a. The Y-direction beam bar insertion holes 8Y are for inserting the beam main bars 6a of the Y-direction beam member 6Y, and are arranged at positions aligned with the corresponding beam main bars 6a.

[0038] FIG. 4 is a longitudinal sectional view of the doorway portion of the building 1, showing the cross section IV-IV in FIG. 3. Note that although the column main bars 4a are deformed bars, they are shown as round steel in FIG. 4. As shown in FIG. 4, the column bar insertion holes 8Z are for inserting the column main bars 4a of the column body 4, and are arranged at positions aligned with the column main bars 4a. As shown together with FIG. 3, the column main bars 4a and the beam main bars 6a of the X-direction beam member 6X are arranged at positions that do not overlap in the Y direction. Also, the column main bars 4a and the beam main bars 6a of the Y-direction beam member 6Y are arranged at positions that do not overlap in the X direction. Although not shown, the beam main bars 6a of the X-direction beam member 6X and the beam main bars 6a of the Y-direction beam member 6Y are arranged at positions (heights) that do not overlap with each other in the vertical direction. These reinforcing bar insertion holes 8 are formed by the sheaths 10 embedded in the precast member.

[0039] As shown in FIG. 3, the sheath 10 that extends vertically and defines the column bar insertion holes 8Z includes a first sheath 10A having a circular cross-sectional shape disposed at the four corners of the column 2 and a second sheath 10B having a non-circular flat cross-sectional shape disposed at other positions. As shown in conjunction with FIG. 4, all the sheaths 10 that extend horizontally and define the X-direction beam bar insertion holes 8X and the Y-direction beam bar insertion holes 8Y are constituted by the second sheaths 10B having a flat cross-sectional shape.

[0040] FIG. 5 shows a (A) plan view and a (B) side view of the second sheath 10B. The second sheath 10B shown in FIG. 5 is in a horizontally extending posture, that is, the same posture as the second sheath 10B that defines the X-direction beam bar insertion holes 8X and the Y-direction beam bar insertion holes 8Y. The sheath 10 is formed in a pipe shape by joining the side edges to adjacent cylindrical portions while spirally winding a steel plate having a predetermined width. A ridge extending in the longitudinal direction of the steel plate is formed in the middle portion in the width direction of the steel plate, and a spiral rib 11 is formed on the outer surface of the sheath 10 by this ridge. The second sheath 10B has a vertically long flat cross-sectional shape in which the width in plan view is smaller than the width in side view. The second sheath 10B can be formed by applying a horizontal force to the first sheath 10A formed in a circular cross-section to deform it, and has an elliptical cross-sectional shape in the present embodiment. However, the manufacturing method of the second sheath 10B is not limited to this.

[0041] As shown in FIGS. 3 and 4, among the second sheaths 10B that extend vertically, those arranged in the X direction are arranged in a posture (rotation angle in plan view) in which the width in the X direction is narrower than the width in the Y direction. That is, these second sheaths 10B are arranged to be short in the X direction, which coincides with the short dimension direction of the second sheath 10B through which the beam main bars 6a of the Y-direction beam member 6Y are inserted. As shown in FIG. 3, among the second sheaths 10B that extend vertically, those arranged in the Y direction are arranged in a posture (rotation angle in plan view) in which the width in the Y direction is narrower than the width in the X direction. That is, these second sheaths 10B are arranged to be short in the Y direction, which coincides with the short dimension direction of the second sheath 10B through which the beam main bars 6a of the X-direction beam member 6X are inserted.

[0042] As shown in FIGS. 3 and 4, the column main reinforcement bars 4a and the beam main reinforcement bars 6a have a non-circular and similar cross-sectional shape. The column main reinforcement bars 4a and the beam main reinforcement bars 6a may have different effective diameters or the same effective diameter, but have the same (identical or similar) cross-sectional shape as described above. Hereinafter, in order to explain these configurations, the configuration of the beam main reinforcement bar 6a will be described as a representative.

[0043] FIG. 6 is a (A) front view and (B) side view of the beam main reinforcement bar 6a. As shown in FIG. 6, the beam main reinforcement bar 6a has a non-circular flat cross-sectional shape in which the width dimension in the front view is smaller than the height dimension. As described above, the beam main reinforcement bar 6a is a deformed bar and has a round steel-shaped main bar portion 12 and a protrusion portion 13 formed to protrude from the outer surface of the main bar portion 12. The protrusion portion 13 has a screw shape formed spirally on the outer surface of the main bar portion 12. However, the beam main reinforcement bar 6a has a cross-sectional shape that is vertically cut off at both side portions. Thereby, the main bar portion 12 has a vertically long flat cross-sectional shape in which the height dimension is larger than the width dimension. Further, the protrusion portion 13 is divided vertically, thereby forming a plurality of upper twisted portions and a plurality of lower twisted portions. However, the shape of the main bar portion 12 and the shape of the protrusion portion 13 are not limited to these. For example, the main bar portion 12 may have a circular cross-sectional shape. The upper and lower portions of the protrusion portion 13 may not have a twist and may extend on a plane orthogonal to the axis of the beam main reinforcement bar 6a. Alternatively, the upper and lower portions of the protrusion portion 13 may be connected to each other by a lower side portion.

[0044] FIG. 7 is a (A) plan sectional view and (B) longitudinal sectional view of the main part of the joint member 5 shown in FIG. 2. FIG. 7(A) is an enlarged view of part VIIA in FIG. 3, FIG. 7(B) is an enlarged view of part VIIB in FIG. 4, and is also a sectional view taken along line VIIB-VIIB in FIG. 7(A). As shown in FIG. 7, the X-direction beam bar insertion holes 8X and column bar insertion holes 8Z respectively defined by the second sheath 10B are both arranged close to each other in a posture (direction) that is short in the Y direction. The beam main bars 6a and column main bars 4a inserted into these are also both arranged in a posture (direction) that is short in the Y direction. That is, the short side direction of the X-direction beam bar insertion holes 8X and column bar insertion holes 8Z is the same as the short side direction of the beam main bars 6a and column main bars 4a.

[0045] The beam main bar 6a is inserted into the X-direction beam bar insertion hole 8X, and the filler 15 is filled in a state where it is inserted into the mechanical joint 7. Also, the column main bar 4a is inserted into the column bar insertion hole 8Z, and the filler 15 is filled in a state where it is inserted into the mechanical joint 7. As shown in FIG. 3, the filler 15 is also filled in the Y-direction beam bar insertion hole 8Y and is also filled in the joint between the joint member 5 and the X-direction beam member 6X and Y-direction beam member 6Y. As shown in FIG. 4, the filler 15 is also filled between the joint member 5 and the upper and lower column bodies 4.

[0046] As shown in FIG. 7, the second sheaths 10B that define the X-direction beam bar insertion holes 8X and column bar insertion holes 8Z are arranged to be in contact with or close to each other at the intersection. In this embodiment, the second sheaths 10B that define the X-direction beam bar insertion holes 8X and column bar insertion holes 8Z both have an elliptical cross-sectional shape that is short in the Y direction. Therefore, it is possible to shorten the distance between the beam main bar 6a and the column main bar 4a.

[0047] Incidentally, when a first sheath 10A having a circular cross section with the same radius as the minor axis radius of the second sheath 10B is arranged instead of the two second sheaths 10B, it is possible to insert the beam main reinforcement 6a and the column main reinforcement 4a therein. However, it becomes difficult to fill the X-direction beam reinforcement insertion holes 8X and the column reinforcement insertion holes 8Z with the filler 15. This is because the space for the filler formed between the inner surface of the sheath 10 and the outer surface of the reinforcement becomes smaller, thereby reducing the fillability of the filler 15.

[0048] In contrast, in the present embodiment, the cross-sectional shape of the column reinforcement insertion hole 8Z and the cross-section of the X-direction beam reinforcement insertion hole 8X are non-circular flat shapes. As a result, the space for the filler between the inner surface of the reinforcement insertion hole 8 and the outer surface of the reinforcement becomes larger, and it is possible to suppress a decrease in the fillability of the filler 15. The same can be said for the Y-direction beam reinforcement insertion hole 8Y. The same can be said for the Y-direction beam reinforcement insertion hole 8Y with respect to the effects described below.

[0049] In this way, the joint member 5 has a column reinforcement insertion hole 8Z which is a first reinforcement insertion hole extending in the vertical direction as the first direction, and an X-direction beam reinforcement insertion hole 8X which is a second reinforcement insertion hole extending in the X direction as a second direction different from the vertical direction. And at least one of the column reinforcement insertion hole 8Z and the X-direction beam reinforcement insertion hole 8X has a short flat cross-sectional shape in the X direction which is the proximity direction at a portion where they are close to each other. As a result, it becomes possible to arrange the column reinforcement insertion hole 8Z and the X-direction beam reinforcement insertion hole 8X close to each other in the X direction, and an increase in the size of the member cross section is suppressed.

[0050] In the present embodiment, both the column reinforcement insertion hole 8Z and the X-direction beam reinforcement insertion hole 8X have a short flat cross-sectional shape in the X direction which is the proximity direction. As a result, it becomes possible to arrange the column main reinforcement 4a and the X-direction beam reinforcement insertion hole 8X closer to each other, and an increase in the size of the member cross section is effectively suppressed.

[0051] In this embodiment, the column main reinforcement 4a inserted into the column reinforcement insertion hole 8Z and the beam main reinforcement 6a inserted into the X-direction beam reinforcement insertion hole 8X have a short and flat cross-sectional shape in the X direction, which is the proximity direction. As a result, compared with the case where the column main reinforcement 4a and the beam main reinforcement 6a have a circular cross-sectional shape, the filling space between the inner surface of the column reinforcement insertion hole 8Z and the outer surface of the column main reinforcement 4a, and the filling space between the inner surface of the X-direction beam reinforcement insertion hole 8X and the outer surface of the beam main reinforcement 6a are larger. Therefore, the decrease in the fillability of the filler 15 is more suppressed. Also, it is possible to make the column reinforcement insertion hole 8Z and the X-direction beam reinforcement insertion hole 8X flatter and arrange them closer. Note that one of the column main reinforcement 4a and the beam main reinforcement 6a may have a circular cross-sectional shape, and the other may have a short and flat cross-sectional shape in the proximity direction. Even in this case, the above effects are achieved to some extent.

[0052] The short dimension direction of the column reinforcement insertion hole 8Z and the short dimension direction of the column main reinforcement 4a are the same. Also, the short dimension direction of the X-direction beam reinforcement insertion hole 8X and the short dimension direction of the beam main reinforcement 6a are the same. As a result, compared with the case where these reinforcements have a circular cross-sectional shape, the shortest distance between the inner surface of the reinforcement insertion hole 8 and the outer surface of the reinforcement becomes larger. Therefore, the decrease in the fillability of the filler 15 is more suppressed.

[0053] The column reinforcement insertion hole 8Z and the X-direction beam reinforcement insertion hole 8X have a flat cross-sectional shape over the entire length. As a result, it is not necessary to align the longitudinal position of the column reinforcement insertion hole 8Z with the position of the X-direction beam reinforcement insertion hole 8X, nor is it necessary to align the longitudinal position of the X-direction beam reinforcement insertion hole 8X with the position of the column reinforcement insertion hole 8Z. Therefore, it is easy to form both reinforcement insertion holes 8.

[0054] In this embodiment, the flat cross-sectional shape of the column reinforcement insertion hole 8Z and the X-direction beam reinforcement insertion hole 8X is an ellipse. That is, there are no recesses or corners in the cross-section of the reinforcement insertion hole 8, and from this, the filler 15 is easily filled over the entire cross-section of the reinforcement insertion hole 8.

[0055] However, the flat cross-sectional shape of the reinforcing bar insertion hole 8 is not limited to an elliptical shape. FIG. 12 is a front view of (A) an oval-shaped second sheath 10B and (B) an oval-shaped second sheath 10B according to another example. As shown, the cross-sectional shape of the reinforcing bar insertion hole 8 may be oval or oval-shaped, and in these cases, the same effects as those of the present embodiment are achieved.

[0056] As shown in FIG. 7, both the column reinforcing bar insertion hole 8Z and the X-direction beam reinforcing bar insertion hole 8X of the present embodiment are formed by the second sheath 10B. Thereby, it is possible to arrange the column reinforcing bar insertion hole 8Z and the X-direction beam reinforcing bar insertion hole 8X in proximity without communicating with each other. However, the same effect is also achieved when one of the column reinforcing bar insertion hole 8Z and the X-direction beam reinforcing bar insertion hole 8X is formed by the second sheath 10B.

[0057] In the present embodiment, the column reinforcing bar insertion hole 8Z extends in the vertical direction which is the first direction, and the X-direction beam reinforcing bar insertion hole 8X extends in the horizontal direction which is the second direction. Thereby, it is possible to arrange the column main reinforcing bars 4a and the beam main reinforcing bars 6a in proximity in the horizontal direction.

[0058] Also, in the present embodiment, the second sheath 10B has a flat cross-sectional shape over the entire length in the longitudinal direction. Thereby, it becomes possible to arrange the second sheath 10B in proximity to another reinforcing bar insertion hole 8 extending in a direction different from its extending direction, and an increase in the size of the member cross-section is suppressed.

[0059] ≪Second Embodiment≫ Next, a second embodiment of the present invention will be described with reference to FIG. 8. The same or similar elements as those in the first embodiment are denoted by the same reference numerals, and duplicate explanations are omitted. The same shall apply to the following embodiments unless otherwise specified.

[0060] FIG. 8 is a (A) plan sectional view and (B) longitudinal sectional view of the main part of the precast member according to the second embodiment, and is a view corresponding to FIG. 7 of the first embodiment. In the present embodiment, while the cross section of the X-direction beam reinforcement insertion hole 8X has a non-circular flat shape, the cross-sectional shape of the column reinforcement insertion hole 8Z is circular. That is, the X-direction beam reinforcement insertion hole 8X is defined by the second sheath 10B having a flat cross-sectional shape, and the column reinforcement insertion hole 8Z is defined by the first sheath 10A having a circular cross-sectional shape.

[0061] Even if the joint member 5 is configured in this way, the dimension of the second sheath 10B in the X direction can be made smaller than in the case of using the first sheath 10A having a circular cross section. Thereby, it is possible to arrange the column reinforcement insertion hole 8Z and the X-direction beam reinforcement insertion hole 8X close to each other without communicating with each other.

[0062] ≪Third Embodiment≫ Next, a third embodiment of the present invention will be described with reference to FIGS. 9 and 10. FIG. 9 is a (A) plan sectional view and (B) longitudinal sectional view of the main part of the precast member according to the third embodiment, and is a view corresponding to FIG. 7. In the present embodiment, the column main reinforcement 4a and the beam main reinforcement 6a have a circular cross-sectional shape. Also, similar to the second embodiment, while the cross section of the X-direction beam reinforcement insertion hole 8X has a flat shape, the cross-sectional shape of the column reinforcement insertion hole 8Z is circular. That is, the X-direction beam reinforcement insertion hole 8X is defined by the second sheath 10B having a flat cross-sectional shape, and the column reinforcement insertion hole 8Z is defined by the first sheath 10A having a circular cross-sectional shape. The column main reinforcement 4a and the beam main reinforcement 6a have different effective diameters or the same effective diameter and have the same (identical or similar) cross-sectional shape. Hereinafter, in order to explain the configuration of the column main reinforcement 4a and the beam main reinforcement 6a, the configuration of the beam main reinforcement 6a will be described as a representative.

[0063] FIG. 10 is a (A) front view and (B) side view of the main beam reinforcement 6a. As shown in FIG. 10, the main beam reinforcement 6a has a circular cross-sectional shape in which the width dimension in the front view is the same as the height dimension. The main beam reinforcement 6a is a deformed bar, and has a round steel-shaped main bar portion 12 and protrusions 13 (13A, 13B) formed to protrude from the outer surface of the main bar portion 12. The protrusions 13 have a plurality of circumferential protrusions 13A formed in the circumferential direction at the upper and lower portions of the outer surface of the main bar portion 12, and two axial protrusions 13B formed in the axial direction at both side portions of the outer surface of the main bar portion 12. The upper circumferential protrusions 13A and the lower circumferential protrusions 13A are arranged at a predetermined interval in the axial direction. The upper circumferential protrusions 13A and the lower circumferential protrusions 13A are arranged offset from each other in the axial direction and are connected to each other by both axial protrusions 13B.

[0064] As shown in FIG. 7(A), the gap in the X direction between the outer surface of the main beam reinforcement 6a and the inner surface of the X-direction beam reinforcement insertion hole 8X is small. On the other hand, since the X-direction beam reinforcement insertion hole 8X has a short and flat cross-sectional shape in the X direction, as shown in FIG. 7(B), the gap in the Z direction between the outer surface of the main beam reinforcement 6a and the inner surface of the X-direction beam reinforcement insertion hole 8X is larger than that in the X direction. Therefore, a space for the filler is secured between the inner surface of the X-direction beam reinforcement insertion hole 8X and the outer surface of the main beam reinforcement 6a, and a decrease in the fillability of the filler 15 is suppressed.

[0065] <<Fourth Embodiment>> Next, a fourth embodiment of the present invention will be described with reference to FIG. 11. FIG. 11 is a (A) plan sectional view and (B) longitudinal sectional view of a main part of a precast member according to the fourth embodiment, and is a view corresponding to FIG. 7. In the present embodiment, the column reinforcement insertion hole 8Z and the X-direction beam reinforcement insertion hole 8X have a short elliptical cross-sectional shape in the proximity direction (X direction) only in the portions close to each other. In other portions, these reinforcement insertion holes 8 have a circular cross-sectional shape having a radius shorter than the major axis radius of the ellipse and longer than the minor axis radius.

[0066] That is, the second sheath 10B of the present embodiment has a non-circular flat cross-sectional shape in a part of the longitudinal direction. Even if the column bar insertion hole 8Z and the X-direction beam bar insertion hole 8X are configured in this way, it is possible to arrange the portion having the flat cross-sectional shape of the second sheath 10B in proximity to the position of another bar insertion hole 8 extending in a direction different from the extending direction thereof. Thereby, an increase in the member cross-section is suppressed.

[0067] With the above, the description of the specific embodiment ends. However, the present invention is not limited to the above embodiment and modification examples, and can be widely modified and implemented. For example, although the sheath 10 is stored inside the joint member 5, after the concrete of the joint member 5 has hardened, one of the sheath 10 defining the column bar insertion hole 8Z and the sheath 10 defining the X-direction beam bar insertion hole 8X may be removed from the joint member 5. By the other sheath 10 being stored inside the joint member 5, the column bar insertion hole 8Z and the X-direction beam bar insertion hole 8X are maintained in a state independent of each other.

[0068] In another embodiment, at least one of the X-direction beam bar insertion holes 8X and the Y-direction beam bar insertion holes 8Y arranged close to each other in the vertical direction may have a short flat cross-sectional shape in the vertical direction at least in a portion close to each other. With such a configuration, it is possible to arrange both beam main bars 6a of the X-direction beam member 6X and the Y-direction beam member 6Y extending in the X-direction and the Y-direction on the horizontal plane close to each other in the vertical direction.

[0069] In another embodiment, the precast concrete member or the sheath 10 of the present invention may be applied to a precast member in which tension member insertion holes extending in different directions are formed. Further, the sheath 10 may be used for a concrete member constructed by in-situ concrete.

[0070] In addition, the specific configurations, arrangements, quantities, materials, etc. of each member and part can be appropriately changed as long as they do not deviate from the gist of the present invention. Further, the above embodiments may be combined with each other in part or in whole. On the other hand, not all of the constituent elements shown in the above embodiments are necessarily essential, and can be appropriately selected.

Description of Symbols

[0071] 1: Building 2: Column 3: Beam 3X: Beam in X direction 3Y: Beam in Y direction 4: Column body (precast member) 4a: Main reinforcement bars of column (reinforcement) 4b: Column reinforcement receiving hole 5: Joint member (precast member) 6: Beam member (precast member) 6X: Beam member in X direction (precast member) 6Y: Beam member in Y direction (precast member) 6a: Main reinforcement bars of beam (reinforcement) 6b: Beam reinforcement receiving hole 7: Mechanical joint 8: Reinforcement bar insertion hole (reinforcement insertion hole) 8X: Beam reinforcement insertion hole in X direction 8Y: Beam reinforcement insertion hole in Y direction 8Z: Column reinforcement insertion hole 10: Sheath 10A: First sheath 10B: Second sheath 12: Main part of reinforcement bar 13: Protrusion 15: Filling material

Claims

1. A precast concrete member, comprising: a plurality of first reinforcing member insertion holes extending in a first direction; and a plurality of second reinforcing member insertion holes extending in a second direction different from the first direction and disposed close to the first reinforcing member insertion holes, wherein at least one of the first reinforcing member insertion holes and the second reinforcing member insertion holes has a short flat cross-sectional shape in a direction close to the other in a portion where it is close to at least the other of the first reinforcing member insertion holes and the second reinforcing member insertion holes. A precast concrete member.

2. The precast concrete member according to claim 1, wherein a reinforcing member inserted into one of the first reinforcing member insertion holes and the second reinforcing member insertion holes has a short flat cross-sectional shape in the close direction.

3. The precast concrete member according to claim 2, wherein the short dimension direction of one of the first reinforcing member insertion holes and the second reinforcing member insertion holes is the same as the short dimension direction of the reinforcing member.

4. The precast concrete member according to claim 1, wherein one of the first reinforcing member insertion holes and the second reinforcing member insertion holes has a flat cross-sectional shape over the entire length.

5. The precast concrete member according to claim 1, wherein both of the first reinforcing member insertion holes and the second reinforcing member insertion holes have a short flat cross-sectional shape in the close direction in at least a portion where they are close to each other.

6. The precast concrete member according to claim 1, wherein the flat cross-sectional shape is an oval, an oblong, or a rectangular shape.

7. The precast concrete member according to claim 1, wherein at least one of the first reinforcing member insertion holes and the second reinforcing member insertion holes is formed by a sheath.

8. The precast concrete member according to claim 1, wherein the first direction and the second direction include a vertical direction and a horizontal direction.

9. A sheath for forming a reinforcing member insertion hole in a concrete member, the sheath having a non-circular flat cross-sectional shape in at least a part of the longitudinal direction.

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