JP6960871B2 - Joint structure between PCa wall and PCa member - Google Patents

Description

The present disclosure relates to a joint structure between a PCa wall and another PCa wall or a PCa member such as a PCa pillar.

When constructing a building, precast concrete (PCa) members may be used to shorten the construction period. When joining a PCa wall to another PCa wall or PCa column, the number of reinforcing bars to be joined to each other increases because the joining surface extends linearly as compared with the joining between the PCa column and the PCa column. If both reinforcing bars are joined by a mechanical joint, the material cost will increase and the construction speed will be slowed down due to the joint work. In particular, in the case of a PCa shear wall, since the number of reinforcing bars to be joined is large, the number of joints and the amount of grout become enormous, and these problems become remarkable. If the construction speed at the joint portion is slowed down, the merit of the PCa member that the construction period can be shortened cannot be fully utilized.

Therefore, various joint structures between the PCa wall with improved workability and other PCa walls and PCa columns have been proposed. For example, Patent Document 1 describes a structure in which a reinforcing bar protruding from a PCa column is housed in a groove provided along an end of a PCa wall, and the groove is embedded with grout. Further, in Patent Document 2, a male joint rail formed on the side portion of one plate-shaped PCa foundation member is inserted into a female joint rail formed on the side portion of the other plate-shaped PCa foundation member. A structure is described in which a shear cotter formed by a plurality of triangular columnar protrusions laid sideways is provided on the remaining portion of both sides, and a grout is filled between both sides. Further, Patent Document 3 describes a joint structure between a PCa shear wall in which a reinforcing bar cotter protrudes from a concrete portion and a column in which the reinforcing bar cotter is embedded in a concrete covering portion.

Japanese Unexamined Patent Publication No. 2001-32409 Japanese Unexamined Patent Publication No. 2017-25667 Japanese Unexamined Patent Publication No. 6-93675

However, in the structure described in Patent Document 1, after the PCa column is installed at a predetermined position, the bar is projected from the PCa column until it is joined to the PCa wall. In order to prevent injuries and catching on clothes due to the reinforcing bars and to improve safety during work, it was necessary to take time and effort such as attaching a reinforcing bar cap to the reinforcing bars. Further, the structure described in Patent Document 2 is a structure suitable for foundation concrete of a wooden house, and the strength of the joint is insufficient to be applied to a seismic wall or the like of a reinforced concrete building. Further, in the structure described in Patent Document 3, since the cotter made of reinforcing bar is contained only in the cover portion, there is a possibility that the desired joint strength cannot be obtained.

In view of such problems, it is an object of the present invention to provide a joining structure between a PCa wall and a PCa member having high construction speed, safety during work, and joining strength.

The joining structure according to at least some embodiments of the present invention is a joining structure (1) between the PCa wall (2) and the PCa member (3), and the PCa wall is the PCa when viewed from the thickness direction. The PCa member has a first concrete portion (5) having a first joint end portion (6) in which a first convex portion (7) bulging on the member side is formed, and the PCa member is attached to the first joint end portion. A second concrete portion having a complementary shape and a second joint end portion (15) in which a second convex portion (16) bulging toward the PCa wall side when viewed from the thickness direction of the PCa wall is formed. (14), the first convex portion has a first hole (8) extending in the vertical direction, and the second convex portion aligns with the first hole in the vertical direction and the first hole. It has a second hole (17) communicating with one hole, and the filler (4) fills the space between the PCa wall and the PCa member, and the first hole and the second hole. do.

According to this configuration, since the filler exists so as to straddle between the first hole and the second hole, the joint between the PCa wall and the PCa member becomes strong. Further, since a mechanical joint having a high material cost and a long work time is not required for joining the PCa wall and the PCa member, the joining structure 1, the cost is low, and the construction speed is high. Further, since the reinforcing bars do not protrude from the joint surfaces of the first joint end portion and the second joint end portion, the safety is high.

The joint structure according to at least some embodiments of the present invention is characterized by having a joint longitudinal streak (20) received in the first hole and the second hole in the above configuration.

According to this configuration, the joint vertical streaks further strengthen the joint between the PCa wall and the PCa member.

In any of the above configurations, the joint structure according to at least some embodiments of the present invention covers the PCa member side of the first hole from the main body of the first concrete portion in a plan view. The PCa member has a first end horizontal streak (13) extending in such a manner and arranged in the first concrete portion, and the PCa member is said to have the second hole from the main body portion of the second concrete portion in a plan view. It is characterized by having a second end horizontal streak (19) extending so as to cover the PCa wall side and embedded in the second concrete portion.

According to this configuration, since the first end lateral streak and the second end lateral streak cover the first hole and the second hole, respectively, damage to the first convex portion and the second convex portion is suppressed, and the PCa wall. And the connection between the PCa member and the PCa member are further strengthened.

In any of the above configurations, the joint structure according to at least some embodiments of the present invention has the first convex portion projecting toward the second convex portion in the vicinity of the end portion on the PCa member side. A second protruding portion (21) having a first protruding portion (21), the second convex portion protruding toward the first convex portion and engaging with the first protruding portion in the vicinity of the end portion on the PCa wall side. It is characterized by having a protruding portion (22).

According to this configuration, the first protruding portion and the second protruding portion are engaged with each other, so that the connection between the PCa wall and the PCa member is further strengthened.

According to the present invention, it is possible to provide a joining structure between a PCa wall and a PCa member having high construction speed, safety during work, and joining strength.

Front view showing a PCa wall and a PCa member in the joint structure according to the embodiment. Top view showing the PCa wall and the PCa member in the joint structure according to the embodiment. Top view showing the joint structure according to the embodiment Front view showing the PCa wall and the PCa member in the joint structure according to the first modification of the embodiment. Front view showing the PCa wall and the PCa member in the joint structure according to the second modification of the embodiment. Front view showing the PCa wall and the PCa member in the joint structure according to the third modification of the embodiment. Top view showing the PCa wall and the PCa member in the joint structure according to the third modification of the embodiment. Front view showing the PCa wall and the PCa member in the joint structure according to the fourth modification of the embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiment is a joint structure 1 between the PCa wall 2 and the PCa member 3, FIGS. 1 and 2 show the PCa wall 2 and the PCa member 3 according to the embodiment, and FIG. 3 shows the joint structure according to the embodiment. 1 is shown. The joint structure 1 has a PCa wall 2, a PCa member 3 that is integrated with the PCa wall 2 to form an earthquake-resistant wall of a building, and a filler 4 that fills the space between the PCa wall 2 and the PCa member 3.

The PCa wall 2 has a first concrete portion 5 that defines a main part of its outer shape. The thickness of the first concrete portion 5 is preferably constant. On the PCa member 3 side of the first concrete portion 5, a first joint end portion 6 to be joined to the PCa member 3 is formed. A first convex portion 7 that bulges toward the PCa member 3 side is formed on the upper portion of the first joint end portion 6 when viewed from the thickness direction (when viewed from the front). Therefore, a step is formed between the upper part and the lower part on the joint surface of the first joint end portion 6. The first convex portion 7 is provided with a first hole 8 penetrating in the vertical direction.

The PCa wall 2 has a plurality of vertical bars 9 and horizontal bars 10 whose intermediate portion is embedded in the first concrete portion 5. The upper portion 9a of the vertical bar 9 protrudes from the first concrete portion 5, and the lower portion 9b of the vertical bar 9 is embedded in the first concrete portion 5 in a state of being connected to the mechanical joint 11. The upper portion 9a of the vertical bar on the lower floor is joined to the lower 9b of the vertical bar 9 on the upper floor by a mechanical joint 11, and is embedded in the floor slab 12 formed of cast-in-place concrete. The lower end side of the vertical streaks 9 arranged in the first convex portion 7 is embedded in the first convex portion 7.

The end of the horizontal bar 10 on the side of the first joint end 6 is embedded in the first concrete portion 5. The horizontal bar 10 located at the same height as the first convex portion 7 is a portion on the central side of the main body portion of the first concrete portion (a portion formed by the first convex portion 7 and the lower joint surface and the first joint end portion) in a plan view. ), And has a first end lateral streak 13 that covers the first hole 8 along the surface of the first convex portion 7. 1 to 3 show an example of a double bar arrangement in which the vertical bars 9 and the horizontal bars 10 are arranged in two rows, but a single bar arrangement in which the vertical bars 9 and the horizontal bars 10 are arranged in one row may be used. The first end lateral bar 13 may be composed of a reinforcing bar common to the intermediate portion of the corresponding horizontal bar 10, or may be composed of a reinforcing bar connected to the intermediate portion of the corresponding horizontal bar 10.

The PCa member 3 is a member made of PCa that constitutes a wall. The PCa member 3 has a second concrete portion 14 that defines a main portion of its outer shape. The thickness of the second concrete portion 14 is preferably constant and is equal to the thickness of the first concrete portion 5. On the PCa wall 2 side of the second concrete portion 14, a second joint end portion 15 to be joined to the PCa wall 2 is formed. At the lower part of the second joint end portion 15, there is a second convex portion 16 that bulges toward the PCa wall 2 at a position deviated from the first convex portion in the vertical direction when viewed from the thickness direction (when viewed from the front). It is formed. Therefore, a step is formed between the upper part and the lower part on the joint surface of the second joint end portion 15. The second joint end portion 15 has a shape complementary to that of the first joint end portion 6. The second convex portion 16 is provided with a second hole 17 penetrating in the vertical direction, and the second hole 17 communicates with the first hole 8 in a consistent manner. The opposite side of the second joint end portion 15 of the PCa member 3 is joined to a pillar 18 made of PCa or cast in place. The column 18 has a column main bar 24 and a band bar 25.

The PCa member 3 has a plurality of vertical bars 9 and horizontal bars 10 like the PCa wall 2. The upper end portion of the vertical streak 9 arranged in the second convex portion 16 is embedded in the second convex portion 16. The horizontal bar 10 located at the same height as the second convex portion 16 is a portion on the central side of the main body portion of the second concrete portion (a portion formed by the second convex portion 16 and the upper joint surface and the second joint end portion) in a plan view. ), And has a second end lateral streak 19 that covers the second hole 17 along the surface of the second convex portion 16. The second end horizontal bar 19 may be composed of a reinforcing bar common to the intermediate portion of the corresponding horizontal bar 10, or may be composed of a reinforcing bar connected to the intermediate portion of the corresponding horizontal bar 10.

The filler 4 is selected from grout, concrete, concrete containing short fibers, and the like, and the PCa wall 2 and the PCa member 3 are integrated with each other. The filler 4 is also filled in the first hole 8 and the second hole 17. The first hole 8 and the second hole 17 preferably receive one or a plurality of joint vertical streaks 20 extending in the vertical direction so as to straddle the first hole 8 and the second hole 17. 20 is embedded in the filler 4.

The procedure for constructing the joint structure 1 will be described. After arranging the PCa member 3 at a predetermined position, the PCa wall 2 is arranged at a predetermined position from above. The upper part 9a of the vertical bar 9 on the lower floor and the lower 9b of the vertical bar 9 on the upper floor are joined by the mechanical joint 11. The joint vertical bar 20 is inserted into the first hole 8 and the second hole 17, and the concrete of the floor slab 12 is placed. The construction of the joint structure 1 is completed by filling the filler 4 between the PCa wall 2 and the PCa member 3 and in the first hole 8 and the second hole 17.

The filler 4 filled in the first hole 8 and the second hole 17 strengthens the bond between the PCa wall 2 and the PCa member 3. When the joint vertical bars 20 are arranged in the first hole 8 and the second hole 17, the joint between the PCa wall 2 and the PCa member 3 becomes stronger. Since the first end lateral streak 13 and the second end lateral streak 19 cover the first hole 8 and the second hole 17, respectively, damage to the first convex portion 7 and the second convex portion 16 is suppressed, and PCa The joint between the wall 2 and the PCa member 3 becomes stronger. Further, since the mechanical joint 11 having a high material cost and a long work time is not required for joining the PCa wall 2 and the PCa member 3, the joining structure 1 has a low cost and a high construction speed. Further, since the reinforcing bars do not protrude from the joint surfaces of the first joint end portion 6 and the second joint end portion 15, the safety is high.

A modified example of the above embodiment will be described with reference to FIGS. 4 to 8. In FIGS. 4 to 6, the reinforcing bars are not shown. In the description of each modification, the same reference numerals are given to the configurations common to the above-described embodiments, and the description thereof will be omitted.

In the first modification shown in FIG. 4, the first convex portion 7 has a first protruding portion 21 projecting toward the second convex portion 16 in the vicinity of the end portion on the PCa member 3 side, and the second convex portion 7. The portion 16 is different from the above embodiment in that the portion 16 has a second protruding portion 22 that projects toward the first convex portion 7 and engages with the first protruding portion 21 in the vicinity of the end portion on the PCa wall 2 side. By engaging the first protruding portion 21 and the second protruding portion 22 with each other, the joint between the PCa wall 2 and the PCa member 3 is further strengthened.

The second modification shown in FIG. 5 is different from the above embodiment in that the first convex portion 7 is provided at an intermediate position in the vertical direction and the second convex portion 16 is provided in a pair at the upper part and the lower part. Neither the upper end portion nor the lower end portion of the vertical bar 9 in the first convex portion 7 protrudes from the first convex portion 7 and is buried in concrete. The vertical streaks 9 in the upper second convex portion 16 and the lower second convex portion 16 are embedded in concrete so that the lower end portion and the upper end portion do not protrude from the second convex portion 16, respectively. The joint between the lower portion 9b of the vertical bar 9 of the PCa wall 2 and the upper portion 9a of the vertical bar 9 on the lower floor is a lap joint as shown in the fourth modification (FIG. 8) described later. The PCa wall 2 is arranged at a predetermined position by moving it in the horizontal direction.

The third modification shown in FIGS. 6 and 7 differs from the above embodiment in that the PCa member 3 is a member made of PCa that mainly constitutes the pillar 18. The second concrete portion 14 of the PCa member 3 has a pillar main body portion 23 that defines the outer shape of the pillar 18 and a second convex portion 16 that bulges from the pillar main body portion 23. The column main body portion 23 and the second convex portion 16 are cast at the factory, but they may be cast integrally or concretes of different strengths may be cast respectively. A column main bar 24 and a band bar 25 are embedded in the column body 23. The end of the second end lateral bar 19 embedded in the second convex portion 16 on the column body 23 side is embedded in the column body 23.

The fourth modification shown in FIG. 8 is a lap joint in that the lower portion 9b of the vertical streaks 9 of the PCa wall 2 and the PCa member 3 and the upper portion 9a of the vertical streaks 9 of the lower floor wall are joined to each other. It is different from the above embodiment. By forming the joint between the vertical bars 9 into a lap joint, when the PCa wall 2 is arranged at a predetermined position, the PCa wall 2 is moved not only in the vertical direction but also in the horizontal direction toward the PCa member 3 and in the diagonal direction. be able to. The shapes of the upper portion 9a and the lower portion 9b of the vertical streaks 9 are U-shaped at the bottom on the end side, but may be changed to a straight line or a hook shape.

Although the description of the specific embodiment is completed above, the present invention can be widely modified without being limited to the above embodiment. The PCa wall may be applied to a wall other than the seismic wall. The first convex portion may be provided at the lower part and the second convex portion may be provided at the upper part. As long as the first joint end portion and the second joint end portion have shapes that complement each other, a plurality of first convex portions and a plurality of second convex portions may be provided. The first end horizontal streak and the second end horizontal streak may have a shape other than the U-shape in a plan view, but it is preferable to have a portion along the joint surface side. The first hole and the second hole may be non-through holes as long as the filler exists so as to straddle the two and there is a filling port for filling the filler.

1: Joint structure 2: PCa wall 3: PCa member 4: Filler 5: First concrete part 6: First joint end 7: First convex part 8: First hole 10: Horizontal bar 13: First end horizontal line 14: Second concrete portion 15: Second joint end portion 16: Second convex portion 17: Second hole 19: Second end horizontal streak 20: Joint vertical streak 21: First protrusion 22: Second protrusion

Claims (3)

It is a joint structure between the PCa wall and the PCa member.
The PCa wall has a first concrete portion having a first joint end portion in which a first convex portion bulging toward the PCa member side is formed when viewed from the thickness direction.
The PCa member has a second joint end portion having a complementary shape to the first joint end portion and having a second convex portion that bulges toward the PCa wall side when viewed from the thickness direction of the PCa wall. Has a second concrete part with
The first convex portion has a first hole extending in the vertical direction, and the second convex portion has a second hole that matches the first hole in the vertical direction and communicates with the first hole. death,
The filler fills the space between the PCa wall and the PCa member, and the first hole and the second hole .
The first convex portion has a first protruding portion that protrudes toward the second convex portion in the vicinity of the end portion on the PCa member side.
The second convex portion has a joint structure having a second protruding portion that projects toward the first convex portion and engages with the first protruding portion in the vicinity of the end portion on the PCa wall side. .. The joining structure according to claim 1, wherein the first hole and the second hole have a receiving joining longitudinal streak. The PCa wall has a first end horizontal streak arranged in the first concrete portion extending from the main body portion of the first concrete portion so as to cover the PCa member side of the first hole in a plan view. death,
The PCa member has a second end horizontal streak embedded in the second concrete portion extending from the main body portion of the second concrete portion so as to cover the PCa wall side of the second hole in a plan view. The joint structure according to claim 1 or 2, wherein the joint structure is characterized in that.

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