JP4636538B2 - Construction method of precast reinforced concrete buildings - Google Patents

Description

  The present invention relates to a method for constructing a precast reinforced concrete structure.

  When a high-rise reinforced concrete building is a precast reinforced concrete building (in the following description, “precast reinforced concrete” is expressed as “PCa”), the columns and beams that constitute the framework of the building are converted to PCa, These PCa column members and PCa beam members are joined on site. Conventionally, beam-column joints were conventionally constructed on-site for the joining, but this involved complicated work with lateral reinforcement reinforcement, formwork construction, and separate placement with slab concrete. Therefore, it took time and effort, and it was difficult to ensure construction accuracy. In addition, the column-beam joint is required to be high-strength concrete like the columns. High-strength concrete has a high viscosity due to a large amount of cement and is not easy to place on site. For this reason, the beam-to-column joint where high-strength concrete is placed on-site becomes a defective part in the frame quality. It was easy. In particular, when the PCa beam member is an inverted beam in which the floor slab is joined to the lower end of the beam, the formwork for placing concrete at the column beam joint is a floating formwork. It was difficult to ensure the accuracy of the above, and the above problems were more likely to occur.

  In order to overcome these disadvantages, the beam-column joint itself is made into PCa, and a PCa beam-beam joint block integrated with a part of the beam or a half of the beam is manufactured, and this is used as the head of the PCa column member. A PCa method for joining has been proposed. The PCa beam-column joint block is usually a block having a height equal to or approximately equal to the beam length of the PCa beam member, and a part of the beam (short beam portion) from the side to the side. ) Or the half of the beam protrudes, and the end of the PCa beam member is joined to the end of the short beam, or the other half of the beam is integrated with another PCa column beam joint block. The ends of the half parts of the beam are joined. Examples of this type of PCa beam-column joint block and literatures that disclose a method for constructing a reinforced concrete building using the block include Japanese Patent Laid-Open Nos. 08-004110 and 2001-193150. There is.

According to the joining method using such a PCa beam-column joint block, it is possible to substantially overcome the above-mentioned many disadvantages associated with the on-site construction of the beam-column joint.
Japanese Patent Laid-Open No. 08-004110 JP 2001-193150 A

  However, when the reinforced concrete structure to be built is a beam member on the outer periphery of which is a reverse beam, there is a difficult problem that cannot be handled by the conventional method using the PCa beam-column joint block. Was. To explain that, even in a building where the beam members on the outer periphery are reverse beams, there is almost no reverse beam up to the beam members in the inner back, and the beam members in the inner back of the building are usually It is a forward beam. Therefore, if the conventional method is followed, the PCa column beam joint block to be joined to the PCa column member on the outer peripheral part of the building is connected to the PCa beam member of the reverse beam on the outer peripheral part and the direction orthogonal thereto. Since the block is joined to both of the forward beam PCa beam members extending in the direction, it must be three-dimensionally bulky. In particular, in a PCa column beam joint block such as a high-rise reinforced concrete building, since the column is thick and the beam formation is large, the size of the PCa column beam junction block is considerable. Therefore, it is extremely difficult to transport the PCa beam-column joint block manufactured at the factory on the public road and transport it to the site, or it may cause a significant transportation cost for the transport. The PCa method has many advantages such as improvement of workability, omission of on-site work, improvement of frame quality, and shortening of the construction period. However, it is impossible or difficult to transport PCa members to the site. In this case, the adoption of the PCa method itself must be abandoned.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a method for constructing a precast reinforced concrete structure suitable for PCa conversion of a reinforced concrete structure having reverse beams and forward beams. More specifically, when the reinforced concrete structure to be constructed is provided with reverse beams and forward beams, the structure is, for example, a high-rise reinforced concrete structure. Even if the pillars are thick and the beams are large, you can fully enjoy the excellent advantages of the PCa construction method without causing any difficulty in transporting PCa members to the site by transporting on public roads. An object of the present invention is to provide a method for constructing a precast reinforced concrete building.

  In order to achieve the above object, a method for constructing a precast reinforced concrete structure according to the present invention includes a reverse beam extending in the X direction, a forward beam extending in the X direction, and a Y direction orthogonal to the X direction. A precast reinforced concrete building comprising a forward beam extending in the direction of a precast reinforced concrete forward beam member (Y direction PCa forward beam member) installed extending in the Y direction and extending in the X direction A precast reinforced concrete column member (a PCa column member for supporting both beams) supporting a reverse beam and a forward beam extending in the Y direction, a forward beam extending in the X direction, and a forward beam extending in the Y direction Supporting precast reinforced concrete column member (PCa column member for forward beam support), precast reinforced concrete reverse beam member (PCa reverse beam member) installed extending in the X direction, extending in the X direction A precast reinforced concrete forward beam member (X direction PCa forward beam member) to be installed, and the PCa reverse beam member is joined to the head of the PCa column member for supporting both beams, and the PCa column member for forward beam support The X direction PCa forward beam member is joined to the stigma, and the Y direction PCa forward beam member and the X direction PCa forward beam member protrude in the Y direction from the tip of the Y direction PCa forward beam member. The beam upper main bar and the beam lower main bar are joined to the beam upper main bar and the beam lower main bar protruding in the Y direction from the side surface of the X direction PCa forward beam member, and the Y direction PCa forward beam member and the PCa reverse beam are joined. In the joint portion with the member, the beam upper main bar and the beam lower main bar that protrude in the Y direction from the tip of the Y-direction PCa forward beam member are protruded in the Y direction from the side surface of the PCa reverse beam member. And said Characterized in that joined to the beam support for PCa Beam lower main reinforcement which from the side of the member to protrude in the Y direction.

  In addition, the construction method of the precast reinforced concrete building according to the present invention includes a reverse beam extending in the X direction at the outer peripheral portion of the building, and an extending portion in the X direction at the outer peripheral portion or the inner back portion of the building. A precast reinforced concrete forward beam member installed extending in the Y direction in a method for constructing a precast reinforced concrete structure comprising a forward beam existing and a forward beam extending in the Y direction perpendicular to the X direction (Y-direction PCa forward beam member) is manufactured, and the Y-direction PCa forward beam member extends from both ends thereof to the Y direction, which is the extending direction of the Y-direction PCa forward beam member, at the tips of the beam upper main bar and the beam lower bar main bar. Protruding reinforced concrete column member (PCa column member for supporting both beams) that supports the reverse beam extending in the X direction and the forward beam extending in the Y direction, with the protruding part, and supporting both beams PCa pillar The upper end of the column main reinforcement protrudes upward from the stigma, and the beam bottom main reinforcement for joining the beam lower main reinforcement of the Y-direction PCa forward beam member in the Y direction from one side surface in the Y direction of the stigma. A precast reinforced concrete column member (a forward beam support PCa column member) that supports the forward beam extending in the X direction and the forward beam extending in the Y direction is manufactured, and the forward beam support PCa The column member shall have the upper end of the column main bar protruding upward from the column head, and a precast reinforced concrete reverse beam member (PCa reverse beam member) installed in the X direction on the outer periphery of the building will be manufactured. The PCa reverse beam member extends in the X direction from a column beam joint portion joined to the column head of the PCa column member for supporting both beams, and one side surface or both side surfaces in the X direction of the column beam joint portion. Precast with integrated reverse beam half A reinforced concrete member (PCa member), with the tip of the beam upper main bar and the beam lower main bar protruding in the X direction from the tip of the reverse beam half of the PCa reverse beam member, and the beam connection of the PCa reverse beam member A beam upper main bar for connecting the beam upper main bar of the Y direction PCa forward beam member is projected from one side surface of the Y direction in the Y direction to the column beam joint of the PCa reverse beam member. It is assumed that a column main bar insertion hole for inserting the upper end of the column main bar protruding upward from the head of the beam supporting PCa column member is formed, and is extended in the X direction at the outer peripheral part or inner inner part of the building. A precast reinforced concrete forward beam member (X direction PCa forward beam member) to be installed is manufactured, and the X direction PCa forward beam member is connected to a column head of the forward beam supporting PCa column member, and the column beam One side or both sides in the X direction of the joint The PCa member is formed by integrating the forward beam half extending from the side surface in the X direction, and the upper end main beam and the lower end main beam of the beam are extended from the front end of the forward beam half of the X direction PCa forward beam member to the X direction. The top end of the beam of the Y-direction PCa forward beam member and the bottom main bar of the beam are projected from one side or both side surfaces in the Y direction of the column beam joint of the X-direction PCa forward beam member in the Y direction. The beam upper main bar and the beam lower main bar for joining are protruded, and the upper end of the column main bar protruding upward from the column head of the PCa column member for forward beam support is formed at the column beam joint of the X-direction PCa forward beam member. It is assumed that a column main bar insertion hole for insertion is formed, and the PCa column member for supporting both beams and the PCa column member for supporting forward beams are installed at predetermined positions in the field, and the PCa column member for supporting both beams The upper end portion of the column main reinforcement protruding upward from the stigma of the Inserting the PCa reverse beam member at the column head of the beam supporting PCa column member through the column main bar insertion hole of the beam member, the column main bar protruding upward from the column head of the forward beam supporting PCa column member The upper end of the X direction PCa forward beam member is inserted into the column main bar insertion hole of the X direction PCa forward beam member, the X direction PCa forward beam member is installed at the column head of the forward beam supporting PCa column member, and the beam upper main bars facing each other are arranged. The beam main bars of the Y-direction PCa forward beam member, the PCa reverse beam member, and the X-direction PCa forward beam member are joined by joining the beam bottom main bars facing each other. The PCa column member and the PCa reverse beam member are joined and integrated, the forward beam supporting PCa column member and the X direction PCa forward beam member are joined and integrated, and the double beam supporting PCa column member and Column of PCa column member for forward beam support Was joined to the installation site, characterized in that concrete is cast crowded denominated the formwork joints joined to one other beam upper main reinforcement and the beam bottom longitudinal reinforcement each other.

  According to the joining method according to the present invention, the PCa member to be used can be a simple and long member that does not have a three-dimensional bulkiness, so that the reinforced concrete structure to be constructed is a reverse beam and a forward beam. Even if the building is thick, such as a high-rise reinforced concrete structure, and has a large beam, the PCa member is transported to the site by transporting it on public roads. It is possible to fully enjoy the excellent advantages of the PCa construction method without causing any difficulty. Therefore, the construction method of the precast reinforced concrete structure suitable for making PCa into the reinforced concrete structure provided with the reverse beam and the forward beam can be obtained.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The building constructed by the construction method according to the present invention includes a reverse beam extending in the X direction, a forward beam extending in the X direction, and a forward beam extending in the Y direction orthogonal to the X direction. In particular, the illustrated example is a reverse beam extending in the X direction on the outer periphery of the building, and the X direction in the outer periphery or the inner back of the building. Is a precast reinforced concrete structure comprising a forward beam extending in the direction Y and a forward beam extending in the Y direction perpendicular to the X direction. This building is composed of a plurality of types of PCa members, and the PCa members include at least two types of PCa column members and three types of PCa beam members. FIG. 1 is an elevational view of the PCa members as viewed from the X direction, showing their relative positions when the construction is completed, and the left-right direction of the figure is the Y direction. The PCa members shown in FIG. 1 are a Y-direction PCa forward beam member 10, a both-beam support PCa column member 12, a forward beam support PCa column member 14, a PCa reverse beam member 16, and an X-direction PCa forward beam member 18. Yes, these PCa members are manufactured as the following members.

  The Y-direction PCa forward beam member 10 is a precast reinforced concrete forward beam member that is installed extending in the Y direction, and is a member that constitutes a forward beam extending in the Y direction of the building. As shown in FIG. 1, the Y-direction PCa forward beam member 10 has the beam upper end main bar 22a and the beam lower end main bar 22b at the ends from the opposite ends in the Y direction, which is the extending direction of the Y-direction PCa forward beam member. Is protruding. Since the Y-direction PCa forward beam member 10 constitutes a forward beam, a floor slab is joined to the upper end thereof. Therefore, in the upper end portion of the Y-direction PCa forward beam member 10, the portion corresponding to the floor slab thickness of the lateral reinforcing bars 24 is exposed together with the beam upper end main reinforcement 22 a, and the concrete at the upper end portion is the concrete of the floor slab. Are placed at the same time.

  The both-beam supporting PCa column member 12 is a precast reinforced concrete column member that supports the reverse beam extending in the X direction and the forward beam extending in the Y direction. As shown in a perspective view in FIG. 2, the PCa column member 12 for supporting both beams projects the upper end portion of the column main reinforcement 26 upward from the stigma, and from the one side surface in the Y direction of the stigma to the Y direction, A beam lower main bar 28 for joining the beam lower main bar 22b of the Y-direction PCa forward beam member 10 is projected. Further, a sleeve-type mechanical joint 30 for burying the both-beam supporting PCa column member 12 to the installation site is embedded in the column base of the both-beam supporting PCa column member 12.

  The forward beam supporting PCa column member 14 is a precast reinforced concrete column member that supports the forward beam extending in the X direction and the forward beam extending in the Y direction. As shown in a perspective view in FIG. 3, the forward beam supporting PCa column member 14 is manufactured as a PCa column member in which the upper end portion of the column main bar 32 protrudes upward from the column head. Similar to the double beam supporting PCa column member 12, a sleeve type mechanical joint 34 is embedded in the column base of the forward beam supporting PCa column member 14 to join the forward beam supporting PCa column member 14 to the installation site. Has been.

  The PCa reverse beam member 16 is a precast reinforced concrete reverse beam member that is installed to extend in the X direction on the outer peripheral portion of the building, and is a member that constitutes the reverse beam extending in the X direction of the building. As shown in a perspective view in FIG. 2, the PCa reverse beam member 16 includes a column beam joint portion 36 that joins the heads of the PCa column members 12 for supporting both beams, and one of the column beam joint portions 36 in the X direction. It is manufactured as a PCa member in which the reverse beam half 38 extending in the X direction from the side surface or both side surfaces is integrated. The reverse beam half 38 is a half-splitter obtained by splitting the reverse beam for one span, which is laid between two adjacent beam supporting PCa column members 12, into two near the center of the span ( (See FIG. 6). Therefore, the PCa reverse beam member 16 installed at the end in the X direction of the building is provided with only one reverse beam half 38 extending from one side surface in the X direction of the column beam joint 36. As shown in FIG. 2, the PCa reverse beam member 16 installed at a place other than the end in the X direction of the building is from both sides in the X direction to both sides in the X direction. It is assumed that two reverse beam half portions 38 extending are provided.

  The PCa reverse beam member 16 has the upper ends of the beam upper main bar 42a and the beam lower main bar 42b protruding in the X direction from the front end of the reverse beam half 38, and the Y direction of the column beam joint 36 thereof. A beam upper main bar 44 for joining the beam upper main bar 22a of the Y-direction PCa forward beam member 10 is protruded in the Y direction from one side surface of the beam. Furthermore, since the PCa reverse beam member 16 constitutes the reverse beam, the floor slab is joined to the lower end thereof. Therefore, a slab bar joint metal fitting 46 is embedded in one side surface of the PCa reverse beam member 16 in the Y direction (the side surface on which the beam upper end bar 44 extends), and the slab bar 48 extends from the side surface in the Y direction. Is protruding.

  Further, the column beam joint portion 36 of the PCa reverse beam member 16 has a column main bar insertion hole 50 for inserting the upper end portion of the column main bar 26 protruding upward from the column head of the PCa column member 12 for supporting both beams, and hardening. A grout injection hole 52, which is a conductive filler injection hole, is formed so as to penetrate therethrough, and a protrusion 53 (see FIG. 4) is formed at the center of the lower surface of the column beam joint 36, which will be described in detail later. .

  The X-direction PCa forward beam member 18 is a precast reinforced concrete forward beam member that is installed in the X direction at the outer peripheral portion or the inner back portion of the building, and constitutes a forward beam extending in the X direction of the building. It is a member. As shown in a perspective view in FIG. 3, the X-direction PCa forward beam member 18 includes a column beam joint portion 54 joined to the column head of the forward beam support PCa column member 14, and the column beam joint portion 54 in the X direction. It is manufactured as a PCa member in which a forward beam half 56 extending in the X direction from one side surface or both side surfaces is integrated. The forward beam half 56 is a one-piece split obtained by dividing the forward beam for one span, which is laid between two adjacent forward beam supporting PCa column members 14, into two near the center of the span. Therefore, the X-direction PCa forward beam member 18 installed at the end in the X direction of the building has only one forward beam half 56 extending from one side surface of the column beam joint 54 in the X direction. As shown in FIG. 3, the PCa reverse beam member 18 installed at a place other than the end in the X direction of the building is provided in the X direction from both sides in the X direction of the column beam joint 54. It is assumed that two forward beam half portions 56 extending to both sides are provided.

  The X-direction PCa forward beam member 18 has the beam upper ends 60a and the beam lower ends 60b protruding from the ends of the forward beam half portions 56 in the X direction. Further, the X-direction PCa forward beam member 18 extends from one or both side surfaces in the Y direction of the column beam joint portion 54 to the Y direction in the Y-direction PCa forward beam member 10. The beam upper main bar 62a and the beam lower bar main bar 62b for joining are projected. The main beam bars 62a and 62b are protruded from only one side surface in the Y direction when the X direction PCa forward beam member 18 is disposed at the end in the Y direction. As shown, the beam main bars 62a and 62b are projected from both side surfaces in the Y direction. Since the X direction PCa forward beam member 18 constitutes a forward beam, a floor slab is joined to the upper end thereof. Therefore, the upper end portion of the X-direction PCa forward beam member 18 is exposed to the floor slab thickness portion of the lateral reinforcing bars 64 together with the beam upper end main bar 62a, and the concrete of the upper end portion is the concrete of the floor slab. Are placed at the same time.

  Further, the column beam joint 54 of the X-direction PCa forward beam member 18 has a column main bar insertion hole 66 for inserting the upper end portion of the column main bar 32 protruding upward from the column head of the PCa column member 14 for supporting the forward beam. Further, a grout injection hole 68 which is a curable filler injection hole is formed so as to penetrate therethrough, and a projection (not shown) is formed at the center of the lower surface of the column beam joint portion 54. They have the same structure and the same function as the column main bar insertion hole 50, the grout injection hole 52, and the projection 53 formed in the column main bar insertion hole 36 of the PCa reverse beam member 16, and the following column main bar insertion holes: The description of 50, the grout injection hole 52, and the protrusion 53 is applicable to them.

  FIG. 4 is a sectional side view showing the stigma of the PCa pillar member 12 for supporting both beams and the PCa reverse beam member 16 placed on the stigma, and FIG. 5 is the same sectional side view as FIG. However, it is the figure which showed the state when inject | pouring the curable filler for joining. As shown in these drawings, the upward protruding length of the column main reinforcement 26 protruding upward from the head of the PCa column member 12 for supporting both beams is larger than the height of the column beam joint portion 36 of the PCa reverse beam member 16. Then, when the PCa reverse beam member 16 is placed on the heads of the PCa column members 12 for supporting both beams, the tip of the upper end portion of the column main reinforcement 26 extends from the upper surface of the column beam joint portion 36 of the PCa reverse beam member 16. It protrudes upward. This is because, after the PCa reverse beam member 16 is joined to the head of the PCa column member 12 for supporting both beams, it protrudes upward from the upper surface of the column beam joint portion 36 of the PCa column member 12 for supporting both beams. This is for joining the upper end of the column main reinforcement 26 and the lower end of the column main reinforcement of the PCa column member provided on the upper floor. Therefore, when the PCa column member is not further provided on the upper floor, it is not necessary to project the top end of the column main reinforcement 26 upward from the upper surface of the PCa column beam joint block 14.

  The protrusion 53 formed on the lower surface of the column beam joint portion 36 of the PCa reverse beam member 16 is a PCa column member for supporting both beams when the PCa reverse beam member 16 is placed on the column head of the PCa column member 12 for supporting both beams. 12 is a protrusion for securing a joint space 70 between the upper surface of the 12 column heads and the lower surface of the column beam joint portion 36 of the PCa reverse beam member 16. Similarly, the above-described protrusion (not shown) formed on the lower surface of the column beam joint 54 of the X direction PCa forward beam member 18 places the X direction PCa forward beam member 18 on the stigma of the forward beam support PCa column member 14. A protrusion for securing a similar joint space between the upper surface of the column head of the forward beam supporting PCa column member 14 and the lower surface of the column beam joint portion 54 of the X direction PCa forward beam member 18 when placed. is there. The protrusion 53 shown in FIG. 4 is a flat truncated pyramid-shaped protrusion (convex cotter), and is formed at the center of the lower surface of the column beam joint portion 36 of the PCa reverse beam member 16. The projections for securing the joint space may have other shapes, and the number of the projections may be two or more. Further, the column beam connection of the PCa reverse beam member 16 or the X direction PCa forward beam member 18 is possible. Instead of forming on the lower surface of the part, it may be formed on the upper surface of the column head of the both-beam supporting PCa column member 12 or the forward beam supporting PCa column member 14 facing those surfaces.

  In the specific example shown in FIGS. 4 and 5, the plurality of column main bar insertion holes 50 of the column beam joint portion 36 of the PCa reverse beam member 16 are formed in the column beam joint portion 36 when the PCa reverse beam member 16 is manufactured. Is formed by burying a plurality of sheath tubes 72 penetrating the tube in the vertical direction. That is, the inner peripheral surface of the column main muscle insertion hole 50 is defined by the inner peripheral surface of the sheath tube 72. As the sheath tube 72, various known ones can be used. In order to increase the fixing force of the PCa reverse beam member 16 to the concrete and the fixing force to the curable filler described later, for example, a spiral tube is used. It is desirable to use a deformed sheath tube, such as a spiral sheath tube with a shaped rib. The upper end portion of the column main bar insertion hole 50 is formed as an enlarged diameter portion, and the upper end of the sheath tube 72 extends to the lower end of the enlarged diameter portion. The purpose of providing this enlarged diameter portion will be described later.

  The curable filler injection hole (grout injection hole) 52 extends through the column beam joint portion 36 of the PCa reverse beam member 16, and the upper end and the lower end are opened to the upper surface and the lower surface of the column main bar insertion hole 36. ing. Therefore, when the PCa reverse beam member 16 is placed on the head of the PCa column member 12 for supporting both beams and the joint space 70 is defined, the lower end of the curable filler injection hole 52 is the joint space. 70 is opened. The curable filler injection hole 28 is an injection hole used to inject the curable filler into the joint space 70 as will be described later.

  The upper end portion of the column main reinforcement 26 protruding upward from the stigma of the double beam supporting PCa column member 12 is inserted into the column main bar insertion hole 50 of the PCa reverse beam member 16, and the PCa is inserted into the stigma of the double beam support PCa column member 12. If the joint space 70 is formed as shown in FIG. 4 by installing the reverse beam member 16, then the periphery of the joint space 70 is sealed with a sealing material 73 as shown in FIG. To do. As the sealing material 73, for example, a kneaded mortar may be used, and other appropriate sealing materials may be used.

  Subsequently, by injecting a curable filler having fluidity into the joint space 70 through the curable filler injection hole 52, the curable filler is filled in the joint space 70, and the joint joint 70 is filled. From the lower end of each of the plurality of column main bar insertion holes 50 opened in the space 70, the plurality of column main bar insertion holes 50 are caused to flow into the plurality of column main bar insertion holes 50, and the inside of the column main bar insertion holes 50 is caused to flow from below to above. The column main reinforcement insertion hole 50 is filled. Thereafter, the filled curable filler is cured, so that the plurality of column main bars 26 are fixedly joined to the respective column main bar insertion holes 50, and thus the PCa column member 12 for supporting both beams and the PCa reverse beam member 16. Are integrated and joined.

  A variety of curable fillers having fluidity can be used, and a particularly preferred example is cement grout. In order to inject cement grout from the upper end of the injection hole 52, for example, a grout pump such as a squeeze pump is used, and the discharge port of the grout pump and the upper end of the injection hole 52 are connected by a vinyl chloride pipe or a pressure hose. Good.

  Further, when cement grout is continuously filled into the plurality of column main reinforcement insertion holes 50 using a grout pump, the column main reinforcement insertion holes 50 closer to the injection holes 52 are filled as shown in FIG. The cement grout rises rapidly and the top of the cement grout tends to rise. Therefore, when the cement grout is injected into the joint space 70, the injection grind and the injection stop are repeated, so that the height of the top of the cement grout to be filled is between the columnar muscle insertion holes 50. It is better not to make a big difference. Further, before the cement grout reaches the upper end of any column main bar insertion hole 50, the injection into the joint space 70 is terminated, leaving unfilled portions in the vicinity of the upper ends of the plurality of column main bar insertion holes 50 as margins, These unfilled portions are preferably filled with cement grout injected from the upper end of each column main reinforcement insertion hole 50. The diameter-enlarged portion provided in the upper end portion of the column main bar insertion hole 50 described above is intended for convenience when filling cement grout from the upper part of the column main bar insertion hole 16 using a mug or the like.

  The method of integrating and joining the both-beam supporting PCa column member 12 and the PCa reverse beam member 16 as described above integrates and joins the forward beam supporting PCa column member 14 and the X direction PCa forward beam member 18. It is also used to That is, the upper end portion of the column main bar 32 protruding upward from the column head of the forward beam supporting PCa column member 14 is inserted into the column main bar insertion hole 66 of the X direction PCa forward beam member 18, and the forward beam supporting PCa column member 14. If the X-direction PCa forward beam member 18 is installed at the stigma of the metal, the periphery of the joint space formed thereby is sealed with a sealing material, and the curable filler is injected through the injection hole 68. Good.

  Next, the construction method in the field is demonstrated with reference to FIG. FIG. 6 is an elevational view as viewed from the Y direction showing two PCa column members 12 for supporting both beams and two PCa reverse beam members 16 with their relative positions when the construction is completed. It is a figure and the left-right direction of a figure is a X direction. In order to construct, a sleeve type mechanical joint in which a column main reinforcement 74 projecting upward from the upper part of the PCa column member on the footing or the lower floor is embedded in the column base of the PCa column member 12 for supporting both beams. 30 and the beam supporting PCa column member 12 is installed at a predetermined position. Further, although not shown in FIG. 6, the forward beam supporting PCa column member 14 is similarly installed at a predetermined position. After that, post-cast concrete is placed on the floor slab of the floor. At this time, the floor slab position of the floor is completed, and the double beam supporting PCa column member 12 and the forward beam supporting PCa column member 14 of the floor are in a state of standing on the floor slab.

  Thereafter, the PCa reverse beam member 16 for supporting the floor slab of the upper floor is extended in the X direction, and as described above, upward from the stigma of the PCa column member 12 for supporting both beams. The upper end portion of the protruding column main reinforcement 26 is inserted into the column main reinforcement insertion hole 50 of the PCa reverse beam member 16 and installed at the stigma of each beam supporting PCa column member 12. FIG. 6 shows the time point when the above is completed. Moreover, although not shown in FIG. 6, the X direction PCa forward beam member 18 for supporting the floor slab of an upper floor is installed similarly. That is, the X direction PCa forward beam member 18 extends in the X direction, and the upper end portion of the column main bar 32 protruding upward from the top of the forward beam supporting PCa column member 14 is the X direction PCa forward beam. It is inserted into the column main reinforcement insertion hole 66 of the member 18 and installed at the stigma of each forward beam supporting PCa column member 14.

  Subsequently, the beam upper principal bars 42a facing each other of the plurality of PCa reverse beam members 16 arranged in the above manner are joined together, and the beam lower principal bars 42b facing each other are joined together to extend in the X direction. Continue the main bar of the reverse beam. Similarly, the column upper principal bars 60a facing each other of the plurality of X-direction PCa forward beam members 18 arranged in a row are joined to each other, and the beam lower principal bars 60b facing each other are joined to extend in the X direction. The main bar of the forward beam is made continuous.

  Further, a plurality of Y-direction PCa forward beam members 10 are horizontally mounted at respective predetermined positions. At this time, as shown in FIG. 1, at the joint portion between the Y-direction PCa forward beam member 10 and the X-direction PCa forward beam member 18, the beam projected from the tip of the Y-direction PCa forward beam member 10 in the Y direction. The upper main bar 22a and the lower beam main bar 22b are joined to the upper beam main bar 62a and the lower beam main bar 62b protruding in the Y direction from the side surface of the X direction PCa forward beam member 18, while the Y direction PCa forward beam member 10 and the PCa are joined. At the junction with the reverse beam member 16, the beam upper main bar 62a and the beam lower bar 62b that protrude in the Y direction from the tip of the Y-direction PCa forward beam member 10 protrude in the Y direction from the side surface of the PCa reverse beam member 16. The beam upper end reinforcement 44 and the beam lower end reinforcement 28 projecting in the Y direction from the side surfaces of both beam supporting PCa column members 12 are joined.

  As described above, if the beam main bars of the Y-direction PCa forward beam member 10, the PCa reverse beam member 16, and the X-direction PCa forward beam member 18 are joined to each other, subsequently, the beam members 10, 16, 18 are half-finished. Temporarily arrange the PCa floor slab and place the floor slab. Next, in accordance with the joining method described above with reference to FIGS. 4 and 5, both beam supporting PCa column member 12 and PCa reverse beam member 16 are joined and integrated, and forward beam supporting PCa column. The member 14 and the X direction PCa forward beam member 18 are joined and integrated. Further, grout is formed on the sleeve type mechanical joint 30 embedded in the column base of the PCa column member 12 for supporting both beams and the sleeve type mechanical joint 34 embedded in the column base of the PCa column member 14 for supporting the forward beam. By filling, the column bases of the column members 12 and 14 are joined and fixed to the installation site. After that, the formwork is built in the joint where the beam upper main bars and the beam lower main bars are joined, and concrete is placed.

  As described above, the method for constructing a precast reinforced concrete building according to the present invention includes a reverse beam extending in the X direction, a forward beam extending in the X direction, and a Y direction orthogonal to the X direction. A method for constructing a precast reinforced concrete structure comprising a forward beam extending, and in this construction method, a Y-direction PCa forward beam member, which is a PCa forward beam member installed extending in the Y direction. A PCa column member for supporting both beams supporting the reverse beam extending in the X direction and the forward beam extending in the Y direction, the forward beam extending in the X direction, and the forward beam extending in the Y direction PCa column member for supporting forward beam supporting PC, PCa reverse beam member which is PCa reverse beam member installed extending in X direction, and X direction PCa which is forward beam member installed extending in X direction Produces a forward beam member. Then, the PCa reverse beam member is joined to the column heads of the double beam supporting PCa column members, and the X direction PCa forward beam member is joined to the column heads of the forward beam supporting PCa column members. In addition, at the joint between the Y-direction PCa forward beam member and the X-direction PCa forward beam member, the beam upper main bar and the beam lower main bar that protrude in the Y direction from the tip of the Y direction PCa forward beam member are arranged in the X-direction PCa order. It joins to the beam upper main bar and the beam lower main bar protruding in the Y direction from the side surface of the beam member, and at the joint between the Y direction PCa forward beam member and the PCa reverse beam member, Beam upper main bar and beam lower bar main bar protruding in the direction from the side of the PCa reverse beam member and beam lower bar main bar protruding in the Y direction from the side of the PCa column member for supporting both beams To join. Therefore, since the PCa member to be used can be a simply elongated member that is not three-dimensionally bulky, the reinforced concrete structure to be constructed has a reverse beam and a forward beam. In addition, even if the building is thick, such as a high-rise reinforced concrete structure, and has a large beam, it may cause difficulty in transporting the PCa member to the site by transporting it on public roads. In addition, the excellent advantages of the PCa method such as improvement of workability, omission of on-site work, improvement of frame quality, and shortening of the construction period can be fully enjoyed.

  In addition, according to the present invention, it is possible to increase the accuracy of lateral reinforcement reinforcement and the dimensional accuracy of the beam-to-column joint, and to densely fill high-strength concrete. Can be built. Furthermore, the linear PCa member obtained by integrating the column beam joint and the beam half body into PCa is easy to manufacture, and it is easy to secure the construction accuracy even in the building.

Y-direction PCa forward beam member, double beam support PCa column member, forward beam support PCa column member, PCa reverse beam member, and X used in the method for constructing a precast reinforced concrete structure according to an embodiment of the present invention It is the elevation view seen from X direction which showed direction PCa forward beam member with those relative positions when construction was completed. It is the perspective view which showed the PCa pillar member for both beam support, and the PCa reverse beam member. It is the perspective view which showed the forward beam support PCa pillar member and the X direction PCa forward beam member. It is the cross-sectional side view which showed the column head of the PCa column member for both beam support, and the PCa reverse beam member mounted in this column head. FIG. 5 is the same cross-sectional side view as FIG. 4, but showing the state when a curable filler is injected for bonding. It is the elevation view seen from the Y direction which showed two PCa pillar members for both beam support, and two PCa reverse beam members with those relative positions when construction was completed.

Explanation of symbols

  10 ... Y direction PCa forward beam member, 12 ... PCa column member for both beam support, 14 ... PCa column member for forward beam support, 16 ... PCa reverse beam member, 18 ... X direction PCa forward beam member, 22a …… Beam upper bar, 22b …… Beam lower bar, 26 …… Column main bar, 28 …… Beam lower bar, 32 …… Column main bar, 36 …… Column beam joint, 38… Reverse beam half, 42a …… Beam upper main bar, 42b …… Beam lower main bar, 50 …… Column main bar insertion hole, 52 …… Curable filler injection hole, 54 …… Column beam joint, 56 …… Forward beam half body, 60a… ... upper end of the beam, 60b ... lower end of the main bar, 62a ... upper end of the beam, 62b ... lower end of the main bar, 66 ... column main bar insertion hole, 68 ... curable filler injection hole, 70 ... joint space.

Claims (7)

In a method for constructing a precast reinforced concrete building comprising a reverse beam extending in the X direction, a forward beam extending in the X direction, and a forward beam extending in the Y direction perpendicular to the X direction,
Precast reinforced concrete forward beam members (Y direction PCa forward beam members) installed extending in the Y direction, precast reinforced concrete column members supporting the reverse beam extending in the X direction and the forward beam extending in the Y direction ( PCa column member for supporting both beams), precast reinforced concrete column member (forward beam supporting PCa column member) for supporting the forward beam extending in the X direction and the forward beam extending in the Y direction, and extending in the X direction Precast reinforced concrete reverse beam member (PCa reverse beam member) to be installed and precast reinforced concrete forward beam member (X direction PCa forward beam member) to be installed extending in the X direction,
The PCa reverse beam member is joined to the head of the PCa column member for supporting both beams,
The X-direction PCa forward beam member is joined to the head of the forward beam supporting PCa column member,
In the joint portion between the Y-direction PCa forward beam member and the X-direction PCa forward beam member, the beam upper main bar and the beam lower main bar protruding in the Y direction from the tip of the Y direction PCa forward beam member are arranged in the X direction. Join to the beam upper main bar and the beam lower main bar protruding in the Y direction from the side of the PCa forward beam member,
At the joint between the Y-direction PCa forward beam member and the PCa reverse beam member, the beam upper main bar and the beam lower main bar that protrude in the Y direction from the front end of the Y-direction PCa forward beam member are used as the PCa reverse beam member. Joining to the beam upper main bar protruding in the Y direction from the side surface of the beam and the beam lower bar main bar protruding in the Y direction from the side surfaces of the PCa column members for supporting both beams.
The construction method of the precast reinforced concrete structure characterized by the above-mentioned. The beam supporting PCa column member projects the upper end portion of the column main bar upward from the column head,
The forward beam supporting PCa column member projects the upper end portion of the column main bar upward from the column head,
The PCa reverse beam member includes a column beam joint portion joined to the column head of the PCa column member for supporting both beams, and a reverse portion extending in the X direction from one side surface or both side surfaces of the column beam joint portion in the X direction. A precast reinforced concrete member (PCa member) integrated with the beam half-body portion, and an upper end portion of the column main bar projecting upward from the column head of the PCa column member for supporting both beams to the column beam joint portion of the PCa reverse beam member Forming a column main muscle insertion hole for inserting
The X-direction PCa forward beam member extends in the X direction from a column beam joint that is joined to the column head of the PCa column member for supporting the forward beam, and one or both sides in the X direction of the column beam joint. The PCa member is integrated with the forward beam half part to be integrated, and the upper end portion of the column main bar protruding upward from the column head of the forward beam supporting PCa column member is formed at the column beam joint portion of the X direction PCa forward beam member. Form a column main muscle insertion hole for insertion,
The upper end portion of the column main bar protruding upward from the column head of the PCa column member for supporting both beams is inserted into the column main bar insertion hole of the PCa reverse beam member, and the PCa reverse is inserted into the column head of the PCa column member for supporting both beams. After installing the beam member, the both beam supporting PCa column member and the PCa reverse beam member are joined and integrated,
The upper end portion of the column main bar protruding upward from the column head of the forward beam supporting PCa column member is inserted into the column main bar insertion hole of the X-direction PCa forward beam member, and the column beam of the forward beam supporting PCa column member is inserted into the column head of the forward beam support PCa column member. After installing the X direction PCa forward beam member, the forward beam supporting PCa column member and the X direction PCa forward beam member are joined and integrated.
The construction method of the precast reinforced concrete structure of Claim 1 characterized by the above-mentioned. A reverse beam extending in the X direction at the outer peripheral part of the building, a forward beam extending in the X direction at the outer peripheral part or inner inner part of the building, and a Y direction orthogonal to the X direction In a method for constructing a precast reinforced concrete structure comprising an extending forward beam,
A precast reinforced concrete forward beam member (Y direction PCa forward beam member) installed extending in the Y direction is manufactured, and the Y direction PCa forward beam member extends from both ends in the extending direction of the Y direction PCa forward beam member. In the Y direction, project the tip of the beam upper and lower beam main bars,
A precast reinforced concrete column member (PCa column member for supporting both beams) that supports a reverse beam extending in the X direction and a forward beam extending in the Y direction is manufactured. The upper end of the column main bar protrudes upward from the side, and the beam lower bar main bar for connecting the beam lower bar main bar of the Y-direction PCa forward beam member protrudes in the Y direction from one side surface of the column head in the Y direction.
A precast reinforced concrete column member (PCa column member for forward beam support) that supports a forward beam extending in the X direction and a forward beam extending in the Y direction is manufactured. Project the upper end of the column main bar upward from
A precast reinforced concrete reverse beam member (PCa reverse beam member) that is installed to extend in the X direction on the outer periphery of the building is manufactured, and the PCa reverse beam member is joined to the head of the PCa column member for supporting both beams. A precast reinforced concrete member (PCa member) in which a column beam joint and an inverted beam half extending from one side or both sides in the X direction of the column beam junction in the X direction are integrated. The tip of the beam upper main bar and the beam lower main bar protrude in the X direction from the tip of the reverse beam half of the reverse beam member, and the Y direction from one side surface in the Y direction of the column beam joint of the PCa reverse beam member The beam upper main bar for connecting the beam upper main bar of the Y-direction PCa forward beam member is projected to the column beam joint of the PCa reverse beam member upward from the column head of the PCa column member for supporting both beams. To insert the upper end of the protruding column reinforcement Forming a pillar main reinforcement insertion hole,
Produces a precast reinforced concrete forward beam member (X direction PCa forward beam member) that extends in the X direction at the outer periphery or inner part of the building, and the X direction PCa forward beam member is used for supporting the forward beam. A PCa member in which a beam-column joint joined to the column head of the PCa column member and a forward beam half extending from one side or both sides of the column-beam joint in the X direction to the X direction are integrated. The tip of the beam upper main bar and the beam lower main bar protrude in the X direction from the tip of the forward beam half of the X direction PCa forward beam member, and the Y direction of the column beam joint of the X direction PCa forward beam member A beam upper principal bar and a beam lower principal bar for joining the beam upper principal bar and beam lower principal bar of the Y direction PCa forward beam member are projected in the Y direction from one side or both side surfaces of the beam. The forward beam supporting PCa column member is connected to the column beam joint of the member. Forming a pillar main reinforcement insertion hole for inserting the upper end of the column main reinforcement projecting from the head upward,
In the field, the PCa pillar member for supporting both beams and the PCa pillar member for supporting forward beams are installed at predetermined positions,
The upper end portion of the column main bar protruding upward from the column head of the PCa column member for supporting both beams is inserted into the column main bar insertion hole of the PCa reverse beam member, and the PCa reverse is inserted into the column head of the PCa column member for supporting both beams. A beam member is installed, and the upper end portion of the column main bar protruding upward from the top of the forward beam supporting PCa column member is inserted into the column main bar insertion hole of the X direction PCa forward beam member, and the forward beam supporting PCa The X direction PCa forward beam member is installed on the column head of the column member,
The beam principal bars of the Y-direction PCa forward beam member, the PCa reverse beam member, and the X-direction PCa forward beam member are joined by joining the beam top principal bars facing each other and joining the beam bottom principal bars facing each other. Joined,
The beam supporting PCa column member and the PCa reverse beam member are joined and integrated, the forward beam supporting PCa column member and the X-direction PCa forward beam member are joined and integrated, and the beam supporting Connecting the column base of the PCa column member for use and the PCa column member for supporting the forward beam to the installation site, and laying the formwork into the joint where the beam upper main bars and the beam lower main bars are joined, and placing concrete.
The construction method of the precast reinforced concrete structure characterized by the above-mentioned. On the upper surface of the column head of the double beam supporting PCa column member or the forward beam supporting PCa column member, or on the lower surface of the column beam joint portion of the PCa reverse beam member or the X direction PCa forward beam member, When the beam member or the X-direction PCa forward beam member is placed on the column head of the double beam support PCa column member or the forward beam support PCa column member, the double beam support PCa column member or the forward beam support Forming a protrusion for securing a joint space between the upper surface of the column head of the PCa column member for use and the lower surface of the column beam joint portion of the PCa reverse beam member or the X direction PCa forward beam member;
A sealant surrounds the joint space formed by placing the PCa reverse beam member or the X-direction PCa forward beam member on the column heads of the double beam supporting PCa column member or the forward beam supporting PCa column member. Sealed,
By injecting a curable filler having fluidity into the joint space, the curable filler is filled into the joint space, and from the lower end of the pillar main bar insertion hole opened in the joint space. Flowing into the column main reinforcement insertion hole, allowing the inside of the column main reinforcement insertion hole to flow from below to above, filling the inside of the column main reinforcement insertion hole,
When the curable filler is cured, the column main reinforcement of the PCa column member for supporting both beams or the PCa column member for supporting forward beam is the column main reinforcement insertion hole of the PCa reverse beam member or the X direction PCa forward beam member. Thus, both the beam supporting PCa column member and the PCa reverse beam member are bonded and integrated, and the forward beam supporting PCa column member and the X direction PCa forward beam member are bonded. To be integrated,
The construction method of the precast reinforced concrete building according to claim 2 or 3,   5. The precast reinforced concrete structure according to claim 4, wherein the column main bar insertion hole is formed by embedding a sheath tube in a column beam joint of the PCa reverse beam member or the X direction PCa forward beam member. Construction method.   Forming a curable filler injection hole penetrating the column beam joint portion of the Y-direction PCa forward beam member or the column beam joint portion of the PCa reverse beam member and having a lower end opened in a lower surface of the column beam joint portion; The method for constructing a precast reinforced concrete structure according to claim 4, wherein the curable filler is injected into the joint space through a curable filler injection hole.   The method for constructing a precast reinforced concrete structure according to claim 4, wherein cement grouting is used as the curable filler, and injection is performed using a grouting pump.

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