JP2007224581A - Hollow precast column - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hollow precast column which can alleviate the labor of manufacturing precast column members, can reduce the weight of the same, and is systemized in connection thereof to a beam, to thereby facilitates the construction of a building frame. <P>SOLUTION: In the hollow precast column which is constructed by connecting the hollow precast column members 1, 2 together in an axial direction, a beam-column connection member 3 for connecting the beam 20 to the column is interposed between the upper and lower precast column members 1, 2, and prestressing steels 4, 5 are inserted into hollow portions 1a, 2a in the precast column members 1, 2. By prestressing the precast column members 1, 2 via the beam-column connection member 3 by means of the prestressing steels 4, 5, a lower end face 2b of the upper precast column member 2 is press-fitted to an upper surface 3a of the beam-column connection member 3, and an upper end face 1c of the lower precast column member 1 is press-fitted to a lower surface 3b of the beam-column connection member 3. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a hollow precast column comprising a plurality of hollow precast column members.

  2. Description of the Related Art Conventionally, a technique for joining a plurality of precast column members, a precast column member and a base member, a precast column member and a precast beam member, or the like by prestress with a PC steel material has been provided. In this conventional technique, a sheath tube is embedded in the precast member in advance in the manufacturing process of a precast member such as a precast column member. And when assembling the precast member, a PC steel material is inserted into the sheath tube, prestress is applied to the precast member by the PC steel material, and the joint surfaces of the precast member are pressure-bonded (for example, see Patent Document 1). .)

Conventionally, a technique for joining hollow precast column members to each other by prestress by PC steel has been provided. In this conventional technology, a PC steel material is inserted into the hollow portion of the hollow precast column member, prestress is applied to the hollow precast column member by this PC steel material, and the joining end surfaces of the upper and lower hollow precast column members are pressed together. (For example, refer to Patent Document 2).
JP 2001-90168 A JP-A-6-173390

However, in the former prior art described above, there is a problem that the operation of embedding the sheath tube is complicated when the precast member is manufactured, and it takes time to manufacture the precast member. Moreover, in the former prior art, there exists a problem that the weight of a precast member is heavy and becomes disadvantageous on construction and structure.
In the latter prior art described above, the frame structure is formed by joining the beam structure to the side surface of the hollow precast column, but in practice, the end surface of the beam structure is directly joined to the side surface of the precast column member. It is difficult to systematize the connection with beams.

  The present invention takes the above-described conventional problems into consideration, can reduce the manufacturing effort of the precast column member, can reduce the weight of the precast column member, and further systematizes the connection with the beam. An object of the present invention is to provide a hollow precast column that can easily construct a frame.

  In the first aspect of the present invention, in the hollow precast column formed by joining the hollow precast column members in the axial direction, the column beam joining members for joining the beams are interposed between the upper and lower precast column members. In addition, the PC steel material is inserted into the hollow portion of the precast column member, and prestress is applied to the precast column member via the column beam joining member by the PC steel material, so that the upper surface of the column beam joining member is The lower end surface of the precast column member is crimped, and the upper end surface of the lower precast column member is crimped to the lower surface of the column beam joining member.

  In the above-described invention, since the precast column member is hollow and the PC steel material is disposed in the hollow portion of the precast column member, it is not necessary to embed a sheath tube in the precast column member. In addition, the precast column member is reduced in weight by a hollow portion. Also, due to the prestress by the PC steel material, the upper end surface of the precast column member on the lower side of the column beam joint member is crimped to the lower surface of the column beam joint member, and the lower end surface of the precast column member on the upper side of the column beam joint member is Since it is crimped to the upper surface of the beam-column joining member, the upper and lower precast column members are joined together via the beam-column joining member. That is, the column beam joining members arranged above and below the precast column member sandwich the precast column member from the upper and lower ends with the PC steel material, and the precast column member and the column beam joining member are integrated.

  The invention according to claim 2 is the hollow precast column according to claim 1, wherein the upper and lower PC steel materials respectively inserted into the upper and lower precast column members are respectively arranged on extension lines of the shafts, The upper end of the lower PC steel material penetrates the column beam joining member and protrudes from the upper surface of the column beam joining member and is fixed to the column beam joining member. The lower end of the upper PC steel material is the column beam joining member. It is characterized by being connected to the upper end of the lower PC steel projecting from the upper surface.

  In the above-described invention, since the upper and lower PC steel materials respectively inserted through the upper and lower precast column members are connected to each other, it is not necessary to form a single fixing structure at the lower end of the PC steel material.

  According to a third aspect of the present invention, in the hollow precast pillar according to the first aspect, the upper and lower PC steel materials respectively inserted into the upper and lower precast pillar members are arranged on different axes from the extension lines of the respective axes. The upper end of the lower PC steel material is fixed to the beam-column joining member, and the lower end of the upper PC steel material is connected to the upper end of the connecting PC steel material fixed to the beam-column connecting member. It is a feature.

  In the above-described invention, it is not necessary to align the upper and lower PC steel materials, and the number and position of the PC steel materials can be freely set for each precast column member of each layer.

  According to the hollow precast column according to the present invention, since the PC steel material is disposed in the hollow portion of the precast column member, there is no need to embed a sheath tube in the precast column member, and the production effort of the precast column member is reduced. Can be reduced. Moreover, weight reduction of a precast column member can be achieved by using a hollow precast column member. Furthermore, since the beam-column joining member is integrated with the precast column member and the upper and lower precast column members are joined together via the column-beam joining member, the beam structure may be appropriately joined to the column-beam joining member, Systematization of the joint with the beam is realized, and the frame can be easily constructed.

  Hereinafter, the first and second embodiments of the hollow precast column according to the present invention will be described with reference to the drawings.

[First embodiment]
First, a first embodiment of a hollow precast column according to the present invention will be described with reference to FIGS.

  FIG. 1 is an elevational sectional view of a hollow precast column according to the first embodiment, and FIG. 2 is a plan sectional view taken along the line A-A shown in FIG. As shown in FIGS. 1 and 2, the hollow precast column according to the present invention is a column structure having a configuration in which a plurality of precast column members 1 and 2 are joined in the axial direction. Specifically, a column beam joining member 3 for joining the beams 20 is interposed between the upper and lower precast column members 1 and 2, and the upper and lower precast column members 1 and 1 are interposed via the column beam joining member 3. Two are joined.

  The precast column members 1 and 2 are, for example, cylindrical precast members made of prestressed reinforced concrete that are hollowly formed by a centrifugal molding method, and are column members that form columns for one building. The hollow portions 1a and 2a of the precast column members 1 and 2 are through holes having a circular cross section, and are opened at the upper and lower ends of the precast column members 1 and 2, respectively.

  The beam-column joining member 3 is a block-shaped member made of reinforced concrete or steel plate, and has a shape in which convex portions 3c and 3d are formed on the upper and lower surfaces 3a and 3b of the hexahedron, respectively. The beam-column joining member 3 is placed on the upper end surface 1c of the lower precast column member 1, and the upper precast column member 2 is built on the upper surface 3a. The convex portion 3 c formed on the lower surface 3 b of the beam-column joining member 3 is a trapezoidal conical convex portion, and is fitted into the upper end of the hollow portion 1 a of the lower precast column member 1. Further, the convex portion 3 d formed on the upper surface 3 a of the column beam joining member 3 is a trapezoidal conical convex portion, and is fitted into the lower end of the hollow portion 2 a of the upper precast column member 2. In addition, a plurality of sheath tubes (not shown) for embedding upper ends of lower PC steel materials 4 to be described later are embedded in the column beam joining member 3. These sheath tubes extend in the vertical direction (column axis direction), and upper and lower ends are opened to the upper and lower surfaces 3 a and 3 b of the column beam joining member 3.

  The lowermost (lower) precast column member 1 is erected on a foundation structure 6 such as a footing, a foundation beam, or a bottom plate. The foundation structure 6 is a reinforced concrete structure, and a trapezoidal conical convex portion 6a that is fitted into the hollow portion 1a of the precast column member 1 is formed at a position where the precast column member 1 is erected. .

  Further, the PC steel materials 4... 5 extending in the vertical direction are respectively inserted into the hollow portions 1 a and 2 a of the upper and lower precast column members 1 and 2, and these PC steel materials 4. Thus, prestress is applied to the precast column members 1 and 2 through the column beam joining member 3. As a result, the lower end surface 2b of the upper precast column member 2 is pressure-bonded to the upper surface 3a of the beam-column joining member 3, and the upper end surface 1c of the lower precast column member 1 is pressure-bonded to the lower surface 3b of the beam-column joining member 3. Has been. That is, the precast column is formed by pressing the lower end surface 2b of the precast column member 2 against the column beam joining member 3 and pressing the column beam junction member 3 against the upper end surface 1c of the precast column member 1 by the PC steel materials 4. The members 1 and 2 and the beam-column joining member 3 are integrated.

  The PC steel materials 4, 5... Inserted into the precast column members 1 and 2 are tension members for applying prestress (compressive stress) in the vertical direction (axial direction) to the precast column members 1 and 2. For example, a steel bar made of high-strength steel, a steel wire, a steel stranded wire, or a cable in which a steel wire or a steel stranded wire is bundled. Further, the PC steel materials 4 ..., 5 ... are members in which male screws are cut at least on the outer peripheral surfaces of both end portions, for example, long bolt-like members in which male screws are cut over the entire length. It may be a member having a configuration in which male screws are cut only at both ends and screws are not cut in other portions.

  The lower PC steel material 4 inserted into the precast column member 1 on the lower side of the beam-column joining member 3 and the upper PC material inserted into the precast column member 2 on the upper side of the beam-column joint member 3. The PC steel materials 5 are arranged on extension lines X1 and X2 of the shafts of the respective shafts. That is, the lower PC steel material 4 is disposed on the axis extension line X2 of the upper PC steel material 5 ..., and the upper PC steel material 5 ... is disposed on the axis extension line X1 of the lower PC steel material 4 .... It is arranged.

  The upper ends of the lower PC steel members 4 are respectively inserted into a sheath tube (not shown) embedded in the beam-column joining member 3 so as to penetrate through the beam-column joining member 3. It protrudes upward from the upper surface 3a of the protrusion 3d of the member 3. A fixing structure 9 is provided on the upper ends of the plurality of lower PC steel members 4 projecting from the upper surface 3a of the projection 3d of the beam-column joining member 3, and the lower PC steel material is provided by the fixing structures 9. The upper ends of 4... Are fixed to the beam-column joining member 3.

  The fixing structure 9 includes, for example, a fixing nut 10 that is screwed to the upper end of the lower PC steel material 4 and a fixing plate 11 that contacts the upper surface 3 a of the column beam joining member 3. The fixing plate 11 is formed with a hole (not shown) for inserting the upper end of the lower PC steel material 4. The upper end of the lower PC steel material 4 is inserted into the hole (not shown) and the PC A fixing plate 11 is attached to the upper end of the steel material 4. Then, a fixing nut 10 is screwed to the upper end of the PC steel material 4 penetrating the fixing plate 11, and the upper end of the lower PC steel material 4 is fixed to the column beam joining member 3 by tightening the fixing nut 10. The

  The lower ends of the lowermost PC steel members 4 are connected to the upper ends of the connecting PC steel members 7 provided on the foundation structure 6. The PC steel material for connection 7 is a member made of the same steel material as the PC steel materials 4 inserted into the precast column members 1 and 2, and in the hollow portion 1a of the precast column member 1 on the lowest floor. Are disposed on an axial extension line X1 of the PC steel material 4. The upper end of the PC steel material 7 for connection protrudes from the upper surface 6b of the convex part 6a of the foundation structure 6, and is connected (coupled) to the lower end of the PC steel material 4 through couplers 8 .... Specifically, a cylindrical coupler 8 having an internal thread cut on the inner peripheral surface is used, the upper end of the connecting PC steel material 7 is screwed to the lower end of the coupler 8, and the lower end of the PC steel material 4 is connected to the coupler 8. The upper end of the connecting PC steel material 7 and the lower end of the PC steel material 4 are connected by being screwed to the upper end.

  The lower ends of the plurality of connecting PC steel materials 7 are fixed to the fixing plate 12 embedded in the foundation structure 6 by nuts 13..., And the connecting PC steel materials 7. The structure 6 is fixed to the structure 6.

  On the other hand, the lower ends of the upper PC steel materials 5... Are connected to the upper ends of the lower PC steel materials 4. Specifically, the lower ends of the upper PC steel materials 5 are connected (coupled) to the upper end portions of the lower PC steel materials 4 protruding from the fixing nut 9 via couplers 14. The couplers 14 have the same configuration as the coupler 8 described above, and the upper end of the lower PC steel material 4 is screwed to the lower end of the coupler 14 and the lower end of the upper PC steel material 5 is screwed to the upper end of the coupler 14. By doing so, the upper end of the lower PC steel material 4 and the lower end of the upper PC steel material 5 are connected.

  The upper ends of the upper PC steel members 5 are fixed to an upper column beam connecting member (not shown) placed on the upper end of the upper precast column member 2. The detailed configuration is the same as the configuration of the upper ends of the lower PC steel materials 4 described above, and thus the description thereof is omitted.

  Next, the construction method of the hollow precast pillar in 1st Embodiment which consists of an above-described structure is demonstrated.

  First, precast column members 1 and 2 are manufactured in advance in a factory or the like, and a column beam joining member 3 is manufactured. At this time, before placing the concrete of the beam-column joining member 3, a sheath tube (not shown) for inserting the plurality of PC steel materials 4... Is installed, and the sheath tube is embedded in the beam-column joining member 3. .

  On the other hand, at the site where the hollow precast pillar is constructed, a process of forming the foundation structure 6 is performed. At this time, before placing the concrete of the foundation structure 6, the fixing plate 12 is disposed at a predetermined position, and a plurality of connecting PC steel materials 7 are fixed to the fixing plate 12 with nuts 13. PC steel materials 7... Are fixed to the foundation structure 6.

  Next, a step of connecting the PC steel materials 4 through the couplers 8 to the upper ends of the plurality of connecting PC steel materials 7 projecting from the upper surface 6b of the convex portion 6a of the foundation structure 6 is performed. Specifically, the couplers 8 are respectively screwed to the upper ends of the plurality of connecting PC steel materials 7 and the lower ends of the PC steel materials 4 are screwed to the couplers 8.

  Next, the process of building the precast column member 1 of the lowest floor (lower side) on the foundation structure 6 is performed. Specifically, the convex portion 6a of the foundation structure 6 is fitted into the lower end of the hollow portion 1a of the precast column member 1 so that the precast column member 1 is built on the upper surface 6b of the foundation structure 6 and The end surface 1 b is brought into contact with the upper surface 6 b of the foundation structure 6. At this time, the plurality of PC steel materials 4 connected to the upper ends of the connecting PC steel materials 7 are inserted into the hollow portion 1 a of the precast column member 1.

  Next, the process of installing the column beam joining member 3 at the upper end of the built precast column member 1 is performed. Specifically, the projection 3c of the beam-column joining member 3 is fitted into the upper end of the hollow portion 1a of the precast column member 1, and the column-beam joining member 3 is placed on the upper end surface 1c of the precast column member 1, The lower surface 3 b of the member 3 is brought into contact with the upper end surface 1 c of the precast column member 1. At this time, the upper end portion of the PC steel material 4 projecting from the upper end of the hollow portion 1a of the precast column member 1 is inserted into a sheath tube (not shown) embedded in the column beam joining member 3.

  Next, a step of fixing the upper ends of the PC steel materials 4 inserted into the hollow portion 1a of the precast column member 1 to the column beam joining member 3 by the fixing structure 9 is performed. Specifically, the fixing plates 11 are respectively inserted into the upper ends of the PC steel members 4 protruding from the upper surface 3a of the convex portion 3d of the column beam joining member 3, and the fixing nuts 10 are screwed together. Then, the fixing nuts 10 are tightened from above the fixing plates 11 to introduce a tension force to the plurality of PC steel materials 4. At this time, the fixing nuts 10 are tightened until the prestress applied to the precast column member 1 through the column beam joining member 3 reaches a predetermined level.

  Next, a step of connecting the PC steel materials 5 through the couplers 14 to the upper ends of the plurality of PC steel materials 4 projecting from the upper surface 3a (the fixing nut 10) of the column beam joining member 3 is performed. Specifically, the couplers 14 are respectively screwed to the upper ends of the plurality of PC steel materials 4 and the lower ends of the PC steel materials 5 are respectively screwed to the couplers 14.

  Next, a step of building the upper precast column member 2 on the column beam joining member 3 is performed. Specifically, the convex portion 3d of the beam-column joining member 3 is fitted into the lower end of the hollow portion 2a of the precast column member 2 so that the precast column member 2 is built on the upper surface 3a of the beam-column joining member 3, and the precast column member 2 Is brought into contact with the upper surface 3 a of the beam-column joining member 3. At this time, a plurality of PC steel members 5 extending in the vertical direction above the column beam joining member 3 are inserted into the hollow portion 2 a of the precast column member 2.

  Thereafter, in the same manner as described above, an upper column beam joining member (not shown) is installed at the upper end of the standing precast column member 2, and then the upper column (not shown) of the PC steel material 5. Fix to the beam joint. Then, after connecting an upper layer PC steel material (not shown) to the upper end of the PC steel material 5..., An upper layer precast column member (not shown) is erected on the upper column beam joining member (not shown). A hollow precast column is constructed by repeating this series of steps. Of course, in the middle of the above-described series of steps, a step of forming other structures such as the beam 20, a slab (not shown), and a wall is appropriately performed.

  According to the hollow precast column having the above-described configuration, the precast column members 1 and 2 are hollow, and the PC steel materials 4 to 5 are disposed in the hollow portions 1a and 2a of the precast column members 1 and 2, respectively. It is not necessary to embed a sheath tube in the precast column members 1 and 2. Therefore, labor for manufacturing the precast column members 1 and 2 can be reduced.

  Moreover, according to the hollow precast column which consists of an above-described structure, since the precast column members 1 and 2 are hollow, the precast column members 1 and 2 are reduced in weight by the amount of the hollow. Therefore, the hollow precast column is advantageous in construction and structure.

  Moreover, according to the hollow precast column which consists of an above-described structure, the upper end surface 1c of the precast column member 1 on the lower side of the column beam joining member 3 is lower surface of the column beam joining member 3 by the PC steel materials 4. 3b, the lower end surface 2b of the precast column member 2 on the upper side of the column beam joining member 3 is crimped to the upper surface 3a of the column beam junction member 3, so that the upper and lower precast column members 1 and 2 are It is in a state of being joined and integrated through the joining member 3. Therefore, the beam 20 may be appropriately joined to the column beam joining member 3, and systematization of the joining with the beam 20 is realized. Thereby, the column beam frame can be easily constructed.

  Moreover, according to the hollow precast pillar which consists of an above-described structure, the upper and lower PC steel materials 4 ..., 5 ... inserted in the upper and lower precast pillar members 1, 2 respectively are on the extension lines X1, X2 of the mutual axes. The upper ends of the lower PC steel members 4 are projected from the upper surface 3a of the beam-column joining member 3 and fixed to the beam-column joining member 3. Since the lower ends of the upper PC steel members 5 are connected to the upper ends of the lower PC steel members 4 projecting from the upper surface 3a of the column beam joining member 3, the lower ends of the PC steel members 5. There is no need to form a single fixing structure. Therefore, the structure of the column beam joining member 3 can be simplified.

[Second Embodiment]
Next, a second embodiment of the hollow precast column according to the present invention will be described with reference to FIGS. In addition, about the structure similar to 1st Embodiment, the description is abbreviate | omitted by attaching | subjecting the same code | symbol.

  FIG. 3 is an elevational sectional view of a hollow precast column according to the second embodiment, and FIG. 4 is a plan sectional view between BB shown in FIG. As shown in FIGS. 3 and 4, the lower PC steel material 4 ′ inserted into the precast column member 1 on the lower side of the column beam joint member 3 and the precast on the upper side of the column beam junction member 3. The upper PC steel materials 5 '... inserted into the column member 2 are respectively arranged on different axes from the extension lines X1, X2 of the respective axes. That is, the lower PC steel material 4 '... is disposed at a position displaced from the axis extension line X2 of the upper PC steel material 5' ..., and the upper PC steel material 5 '... is lower PC steel material 4' .... Is disposed at a position deviated from the axial extension line X1.

  The upper end of the lower PC steel material 4 ′ is penetrated into the beam-column joining member 3 and fixed to the beam-column joining member 3 by the fixing structure 9 as in the first embodiment described above. . Further, the lower ends of the PC steel materials 4 'on the lowest floor are also connected to the upper ends of the connecting PC steel materials 7 provided on the foundation structure 6 as in the first embodiment.

  On the other hand, the lower ends of the upper PC steel materials 5 ′ are connected to the upper ends of the connecting PC steel materials 17 provided on the column beam joining member 3. The connecting PC steel material 17 is a member made of the same steel material as the PC steel materials 4 ′, 5 ′ inserted into the precast column members 1, 2, and is in the hollow portion 2 a of the upper precast column member 2. Are disposed on the axis extension line X2 of the PC steel material 5 '. The upper end of the PC steel material 17 for connection protrudes from the upper surface 3a of the convex part 3d of the column beam joining member 3, and is connected (joint) to the lower end of the PC steel material 5 '... via couplers 14' .... Specifically, a cylindrical coupler 14 ′ having an internal thread cut on the inner peripheral surface is used, and the upper end of the connecting PC steel material 17 is screwed to the lower end of the coupler 14 ′ and the lower end of the PC steel material 5 ′ is The upper end of the connecting PC steel material 17 and the lower end of the PC steel material 5 ′ are connected by screwing into the upper end of the coupler 14 ′.

  The lower ends of the plurality of connecting PC steel members 17 are fixed to the fixing plate 18 embedded in the beam-column joining member 3 with nuts 19. The connecting PC steel members 17. It is fixed to the beam-column joining member 3.

  Next, the construction method of the hollow precast pillar in 2nd Embodiment which consists of an above-described structure is demonstrated. In addition, the construction method of the hollow precast pillar in 2nd Embodiment differs from the construction method of the hollow precast pillar in 1st Embodiment mentioned above by the following points.

  First, when the beam-column joining member 3 is manufactured in advance in a factory or the like, a sheath tube is embedded in the beam-column joining member 3 and a plurality of connecting PC steel materials 17. Let it settle. Specifically, before placing the concrete of the beam-column joining member 3, a sheath tube (not shown) for inserting a plurality of PC steel materials 4 ′ is installed, and the fixing plate 18 is arranged at a predetermined position. A plurality of connecting PC steel materials 17 are fixed to the fixing plate 18 with nuts 19.

  Second, when the PC steel members 5 are installed above the beam-column joining member 3, they protrude from the upper surface 3a (the fixing nut 10 ...) of the beam-column joining member 3 instead of the upper end of the lower PC steel material 4 '. It connects with the upper end of PC steel material 17 ... for connection. Specifically, the couplers 14 ′ are respectively screwed to the upper ends of the plurality of connecting PC steel materials 17, and the lower ends of the PC steel materials 5 are screwed to the couplers 14 ′.

  The construction method of the hollow precast column in the second embodiment is the same as the construction method of the hollow precast column in the first embodiment described above except for the above points, and the description thereof is omitted.

  According to the hollow precast column having the above-described configuration, it is possible to reduce the labor for manufacturing the precast column members 1 and 2 as in the first embodiment described above. Further, systemization is realized for the joint with the beam 20, and the column beam frame can be easily constructed.

  Moreover, according to the hollow precast pillar which consists of an above-described structure, the upper and lower PC steel materials 4 '..., 5' ... inserted in the upper and lower precast pillar members 1 and 2, respectively, are extended lines X1, Are arranged on different axes from X2, and the upper ends of the lower PC steel members 4 'are fixed to the column beam joining member 3, and the lower ends of the upper PC steel members 5' are arranged at the column beam joining member 3. Since it is configured to be connected to the upper end of the connecting PC steel material 17 fixed to the upper and lower, it is not necessary to align the upper and lower PC steel materials 4 '..., 5' ..., and the precast column member of each layer The number and position of the PC steel materials 4 ′, 5 ′,. Accordingly, the prestress applied to the precast column members 1 and 2 of each layer can be set individually for each layer, and the degree of design freedom can be expanded.

  The first and second embodiments of the hollow precast column according to the present invention have been described above. However, the present invention is not limited to the first and second embodiments described above, and departs from the spirit thereof. It is possible to change appropriately within the range not to be. For example, in the first and second embodiments described above, the cylindrical precast column members 1 and 2 made of PS concrete formed hollow by a centrifugal molding method are used. However, the present invention has any structure. It may be a precast column member, for example, a normal precast member made of reinforced concrete, or a precast member made of steel pipe wound reinforced concrete. Further, the precast column member according to the present invention may be a member other than a cylindrical shape as long as it is a hollow column member. For example, as shown in FIG. 5, square column-shaped hollow precast column members 1 ′ and 2 ′. It may be. In addition, when using the above-mentioned square columnar precast column members 1 ′ and 2 ′, the convex portions 3c ′ of the column beam joining members 3 ′ fitted into the hollow portions 1a ′ and 2a ′ of the precast column members 1 ′ and 2 ′, 3d ′ is formed in a trapezoidal quadrangular pyramid shape (a shape obtained by cutting the tip portion on the apex side of the quadrangular pyramid).

  In the first and second embodiments described above, the precast column members 1 and 2 that form one layer of columns are joined. However, the present invention forms a plurality of layers of columns. The structure which joins a precast pillar member may be sufficient.

  In the first and second embodiments described above, a sheath tube (not shown) for inserting the PC steel materials 4..., 4 ′ is embedded in the column beam joining member 3, and a precast column member is formed by a so-called post tension method. Although prestress is given to 1 and 2, the present invention may give prestress by what is called a pretension system, without embedding a sheath pipe in a column beam joining member.

In the first and second embodiments described above, the beam-column joining member 3 has a shape in which the convex portions 3c and 3d are formed on the upper and lower surfaces 3a and 3b of the hexahedron. The beam connecting member may have any shape, for example, a column beam connecting member formed of an octahedron.
In addition, the present invention can replace the configurations in the first and second embodiments with known configurations without departing from the spirit of the present invention, and can appropriately combine the above-described modified examples. Is possible.

It is an elevation sectional view of a hollow precast pillar for explaining a 1st embodiment of the present invention. It is a plane sectional view of the hollow precast pillar for demonstrating the 1st Embodiment of this invention, and is sectional drawing between AA shown in FIG. It is an elevation sectional view of a hollow precast pillar for explaining a 2nd embodiment of the present invention. It is a cross-sectional view of the hollow precast pillar for demonstrating the 2nd Embodiment of this invention, and is sectional drawing between BB shown in FIG. It is a plane sectional view of a hollow precast pillar for explaining other embodiments of the present invention.

Explanation of symbols

1 (lower) precast column member 1a hollow portion 1c upper end surface 2 (upper) precast column member 2a hollow portion 2b lower end surface 3 column beam joining member 3a upper surface 3b lower surface 4, 4 '(lower) PC steel material 5 5 '(upper PC steel) 20 Beam X1 (lower PC steel) shaft extension X2 (upper PC steel) shaft extension

Claims (3)

In the hollow precast column formed by joining the hollow precast column members in the axial direction,
The column beam joining member for joining the beam is interposed between the upper and lower precast column members, and the PC steel material is inserted into the hollow portion of the precast column member,
By applying prestress to the precast column member via the column beam joint member by the PC steel material, the lower end surface of the upper precast column member is crimped to the upper surface of the column beam joint member, and the column beam joint member A hollow precast column, wherein an upper end surface of a lower precast column member is pressure-bonded to a lower surface. In the hollow precast pillar according to claim 1,
The upper and lower PC steel materials respectively inserted into the upper and lower precast column members are respectively arranged on the extension lines of the respective shafts,
The upper end of the lower PC steel material penetrates the beam-column joining member and protrudes from the upper surface of the beam-column joining member and is fixed to the beam-column joining member,
A hollow precast column characterized in that the lower end of the upper PC steel material is connected to the upper end of the lower PC steel material protruding from the upper surface of the column beam joining member. In the hollow precast pillar according to claim 1,
The upper and lower PC steel materials respectively inserted into the upper and lower precast column members are respectively arranged on different axes from the extension lines of the respective shafts.
The upper end of the lower PC steel material is fixed to the beam-column joining member,
A hollow precast column characterized in that the lower end of the upper PC steel material is connected to the upper end of the connecting PC steel material fixed to the column beam joining member.

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