JP2015178703A - Joint structure and precast member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve manpower saving and shortening of a construction period by enabling a beam to be constructed by relatively small-scale timbering, in regard to beam construction using a precast member.SOLUTION: Second and third precast members are joined via a joint part on both sides of a first precast member including a column-beam joint and a beam part equivalent to one span. The first precast member comprises a sheath pipe that penetrates between joint surfaces, and a splice reinforcement that is provided along the sheath pipe. A beam main reinforcement straddling the first and second precast members and a beam main reinforcement straddling the first and third precast members are inserted into the sheath pipe, and a lap joint is formed by the splice reinforcement. A grout material is injected into the sheath pipe.

Description

  The present invention relates to a joint structure between PCa (precast) members.

  As construction methods for constructing beams using PCa members, the construction methods of Patent Documents 1 and 2 have been proposed. Patent Document 1 discloses a joint structure in which a PCa member is joined at the center in the longitudinal direction of a beam and a splice is slid to form a lap joint as a joint structure between beam main bars. Patent Document 2 discloses a sheath pipe that is provided over the entire length of a PCa member that forms beams on both sides of a column / beam joint where concrete is cast in-situ, and the beam main bar can be slid within the sheath pipe. ing. A supplementary bar is embedded in the longitudinal center of the PCa member, and the joint structure between the beam main bars is a lap joint.

Japanese Patent No. 4961456 Japanese Patent No. 3072534

  In the construction method of Patent Document 1, a support work for each PCa member to be joined at the longitudinal center of the beam is required, and the support work may be large. If the support work is large, installation of the support work requires a large amount of money, and another work may not be performed on the lower floor until it is removed. In the construction method of Patent Document 2, since concrete is cast on-site at the column / beam joint, there is room for improvement in terms of labor saving and construction period.

  An object of the present invention is to construct a beam using a PCa member with a relatively small support work, and to save labor and shorten the construction period.

  According to the present invention, the first PCa member including the column / beam joint and the beam portion for one span, and the first PCa member joined to one joint surface of the first PCa member via the joint portion. A second PCa member and a third PCa member joined to the other joint surface of the first PCa member via a joint portion, and the first PCa member includes the one joint surface A first sheath tube penetrating between the other joint surface and an accessory bar provided along the first sheath tube at an intermediate position of the beam portion; and the second PCa The member includes a second sheath tube opened at a joint surface with the first PCa member, and the third PCa member is a third sheath tube opened at a joint surface with the first PCa member. The first sheath tube extends from the intermediate portion of the beam portion to the second sheath tube. And the other beam main bar extending from the midway part of the beam portion to the third sheath tube, and the one beam main bar and the other beam main bar are A joint structure is provided, in which a grout material is injected into the sheath tube so as to form a lap joint by a splicing bar.

  Further, according to the present invention, there is provided a PCa member, which is a sheath that penetrates between at least one column / beam joint, a beam for one span, and one end surface and the other end surface of the PCa member. There is provided a PCa member comprising a tube and a supplementary bar provided along the sheath tube at an intermediate portion of the beam portion.

  In addition, according to the present invention, the PCa member has a beam portion for one span, a column / beam joint portion, and opens to an end surface of the PCa member on the beam portion side to the middle portion of the beam portion. In the sheath tube disposed, the beam main bar extending from the midway portion of the beam portion to the end surface of the PCa member on the column / beam joint side, and the sheath at the midway portion of the beam portion There is provided a PCa member comprising a pipe and a supplementary bar provided along the beam main bar.

  According to the present invention, it is possible to construct a beam using a PCa member with a relatively small support work, thereby saving labor and shortening the construction period.

The schematic diagram which shows the example of the frame structure using the joining structure which concerns on one Embodiment of this invention. (A)-(C) is a schematic diagram which shows the example of a PCa member, (D) is explanatory drawing of the fall prevention panel of a beam main reinforcement. (A) And (B) is explanatory drawing of the construction procedure of the frame structure of FIG. (A) is a figure which shows another example of support work, (B) is explanatory drawing which shows the example of an insertion instrument. (A) And (B) is explanatory drawing of the construction procedure of the frame structure of FIG. (A) And (B) is explanatory drawing of the construction procedure of the frame structure of FIG. (A) And (B) is explanatory drawing of the construction procedure of the frame structure of FIG. (A) And (B) is explanatory drawing of the construction procedure of the frame structure of FIG. (A) And (B) is explanatory drawing of another example. (A)-(C) are explanatory drawings of another example. (A) And (B) is explanatory drawing of the construction procedure of the frame structure of FIG. 10 (A) and (B). (A) And (B) is explanatory drawing of the construction procedure of the frame structure of FIG. 10 (A) and (B). (A) And (B) is explanatory drawing of the construction procedure of the frame structure of FIG. 10 (A) and (B). Explanatory drawing of another example.

<First embodiment>
FIG. 1 is a schematic diagram illustrating an example of a frame structure 1 using a joint structure according to an embodiment of the present invention, and FIGS. 2A to 2C are explanatory diagrams of a PCa member used in the frame structure 1. FIG.

  The frame structure 1 includes a plurality of columns 2, a plurality of beams 3 installed between adjacent columns 2, and a column / beam joint 4, and a unit layer portion (for example, a first floor portion) of a multi-layer building. Is building. In the case of the present embodiment, the entire frame structure 1 is constructed of a PCa member, and the construction of the concrete-fired portion of the concrete is minimized. In the case of the present embodiment, the pillar 2 is constituted by a pillar member 20 that is a PCa member, and a pillar main bar 21 that is joined to a pillar on an upper floor protrudes from the top.

  The beam 3 and the column / beam joint 4 are composed of PCa members 6 to 7 shown in FIGS. Among the PCa members 6 to 8, the PCa member 6 is located in the middle in FIG. 1, the PCa member 7 is located on the left side of the PCa member 6, and the PCa member 8 is located on the right side of the PCa member 6, respectively. 6 is joined. The PCa member 6 and the PCa member 7, and the PCa member 6 and the PCa member 8 are joined via the joint portion 5. The joint portion 5 has, for example, a width of several tens of millimeters and is constituted by a joint material such as a grout material.

  Hereinafter, the configuration of the PCa members 6 to 8 will be described with reference to FIGS. The PCa members 6 to 8 are provided with configurations other than the illustrated configuration such as reinforcing bars, but are not illustrated for convenience of explanation.

  Referring to FIG. 2A, the PCa member 6 is provided on the column member 20 and constitutes one beam 3 with a column / beam junction PZ constituting one column / beam junction 4. It is a rectangular parallelepiped member integrally provided with a beam portion BM for one span, and one end face 6a in the longitudinal direction (span direction of the beam 3) constitutes a joint surface with the PCa member 7, and the other end face 6b. Constitutes a joint surface with the PCa member 8.

  The PCa member 6 includes a member concrete 61, a plurality of sheath tubes 62, a beam main bar 63, a plurality of accessory bars 64, and a plurality of column main bar insertion portions 65. The sheath tube 62 is embedded in the member concrete 61 in order to allow the beam main reinforcement 63 to be inserted, and is provided in the longitudinal direction of the PCa member 6 so as to pass through between the end surface 6a and the end surface 6b, and these end surfaces 6a, 6b. Is open. In the present embodiment, one sheath tube 62 is assigned to one beam main bar 63. Accordingly, the sheath tube 62 is provided in accordance with the number of beam main bars 63 and the arrangement site. In addition, the number and arrangement | positioning site | part of a beam main reinforcement are common specifications in each PCa members 6-7.

  The beam main reinforcement 63 has a length approximately equal to the entire length of the PCa member 6 and is accommodated in the sheath tube 62. The beam main bar 63 is provided with a plurality of spacers 66 for the purpose of improving the slidability in the sheath tube 62 and positioning the sheath tube 62 at the center. For example, a spacer for a lock bolt can be used as the spacer 66. The spacer 66 includes a pair of pipe portions through which the beam main reinforcing bars 63 are inserted, and an enlarged diameter portion provided between the pair of pipe portions. The beam main reinforcement 63 is supported, and the enlarged diameter portion is in sliding contact with the inner surface of the sheath tube 62.

  The accessory bar 64 is embedded in the member concrete 61 along the sheath tube 62 for each sheath tube 62. The splicing bar 64 is provided at an intermediate portion of the beam portion BM, and in the case of this embodiment, extends in the longitudinal direction over a predetermined range at the center portion of the beam portion BM. As shown in FIG. 1, finally, the end of the beam main bar 63 and the end of the beam main bar 83 of the PCa member 8 are close to the sheath tube 62 in the region where the accessory bar 64 is disposed. 63 and 83 and the accessory muscle 64 overlap. The grout material G is injected into the sheath tube 62, and the strength thereof is expressed, so that the beam main bar 63 and the beam main bar 83 constitute a lap joint by the auxiliary bar 64. By using a lap joint, the cost can be reduced compared to the case where a mechanical joint is employed.

  The column main bar insertion portion 65 is a hole formed so as to penetrate in the vertical direction in the column / beam joint PZ, and is formed by, for example, a sheath tube. In the case of this embodiment, one column main reinforcement insertion portion 65 is assigned to one column 21. Therefore, the column main bar insertion portion 65 is provided in accordance with the number of beam main bars 21 and the arrangement site.

  Next, the PCa member 7 will be described with reference to FIG. The PCa member 7 is a member constituting the end of the beam. The PCa member 7 may have the same configuration as that of the PCa member 6, but is different in this embodiment in that it forms the end of the beam.

  The PCa member 7 is provided on the column member 20, and a column / beam joint PZ constituting one column / beam joint 4 and a beam portion BM for one span constituting one beam 3 are integrated. The one end surface 7a in the longitudinal direction constitutes an end portion of the beam of the frame structure 1, and the other end surface 7b constitutes a joint surface with the PCa member 6.

  The PCa member 7 includes a member concrete 71, a plurality of sheath tubes 72, a beam main bar 73, a plurality of accessory bars 74, and a plurality of column main bar insertion portions 75.

  The sheath tube 72 is embedded in the member concrete 71 in order to allow the beam main reinforcement 63 to be inserted, and is provided in the longitudinal direction of the PCa member 7 from the end surface 7b to the middle portion (center portion) of the beam portion BM, and the end surface 7b. Is open.

  The beam main reinforcement 73 extends from the end of the sheath tube 72 to the end surface 7 a and is embedded in the member concrete 71. A fixing portion may be provided at the end of the beam main bar 73 on the end surface 7a side.

  The accessory bar 74 is embedded in the member concrete 71 along the sheath pipe 72 and the beam main bar 73 for each sheath pipe 72. The splicing bar 74 is provided at an intermediate portion of the beam portion BM, and in the case of the present embodiment, extends in the longitudinal direction over a predetermined range at the center portion of the beam portion BM. As shown in FIG. 1, the beam main bar 63 is finally inserted into the sheath tube 72. As a result, the end portions of the beam main bars 73 and the end portions of the beam main bars 63 are close to each other, and the beam main bars 63 and 73 overlap the auxiliary bars 74 in the region where the additional bars 74 are disposed. The grout material G is injected into the sheath tube 74 and its strength is developed, so that the main beam 63 and the main beam 73 of the beam constitute a lap joint by the auxiliary bar 74.

  The column main bar insertion portion 75 is a hole formed so as to penetrate in the vertical direction in the column / beam joint PZ, and is the same as the column main bar insertion portion 65.

  Next, the PCa member 8 will be described with reference to FIG. The PCa member 8 is a member constituting the end of the beam. The PCa member 8 has the same configuration as that of the PCa member 6, but includes two column / beam joints PZ.

  The PCa member 8 is provided on the column member 20 and includes a column / beam joint PZ constituting one column / beam joint 4 at both ends thereof, and thus includes two columns / beam joints PZ. ing. A beam portion BM for one span constituting one beam 3 is provided between the column / beam joints PZ, and the PCa member 8 is a rectangular parallelepiped member integrally including these. One end surface 8 a in the longitudinal direction of the PCa member 8 constitutes a joint surface with the PCa member 6, and the other end surface 7 b constitutes an end portion of the beam of the frame structure 1.

  The PCa member 8 includes a member concrete 81, a plurality of sheath tubes 82, a beam main bar 83, a plurality of accessory bars 84, and a plurality of column main bar insertion portions 85. The sheath tube 82 has the same configuration as the sheath tube 62, is embedded in the member concrete 81 so as to allow the beam main reinforcement 83 to be inserted, and extends in the longitudinal direction of the PCa member 8 so as to penetrate between the end surface 8a and the end surface 8b. It is provided in the direction and is open to these end faces 8a and 8b.

  The beam main bar 83 has a length that is about the entire length of the PCa member 8 and is accommodated in the sheath tube 82. The beam main bar 83 is provided with a spacer 86 similar to the spacer 66 of the beam main bar 63 to improve the sliding property within the sheath tube 82 and to position the sheath tube 82 at the center.

  The accessory bar 84 is embedded in the member concrete 81 along the sheath tube 82 for each sheath tube 82, and has the same configuration as the accessory bar 64. That is, the splicing bar 84 is provided at an intermediate portion of the beam portion BM, and in the case of this embodiment, extends in the longitudinal direction over a predetermined range at the center portion of the beam portion BM.

  As shown in FIG. 1, the end of the beam main bar 83 and the end of the beam main bar 9 are close to the sheath tube 82 in the region where the accessory bar 84 is disposed. The accessory muscle 84 overlaps. The grout material G is injected into the sheath tube 82 and its strength is developed, so that the main beam 9 and the main beam 83 constitute a lap joint with the auxiliary bar 84.

  The column main bar insertion portion 85 is a hole formed so as to penetrate in the vertical direction in each of the two column / beam joints PZ, and is the same as the column main bar insertion portions 65 and 75 described above.

  Next, an example of the construction procedure of the frame structure 1 will be described mainly with reference to FIGS. Here, the case where it constructs in order from the left side of FIG. 1 is assumed. First, as shown in FIG. 3 (A), the PCa member 7 is lifted by a crane or the like and moved onto the existing column member 20 and the support 11 constructed on the floor slab, and shown in FIG. 3 (B). The column member 20 and the support work 11 are lowered. At this time, the column / beam joint PZ is mounted on the column member 20 while inserting the column main reinforcement 21 into the column main reinforcement insertion portion 75 described above. The PCa member 7 is supported by a column member 20 on the end surface 7a side and a support 11 on the end surface 7b side. Since the PCa member 7 includes the column / beam joint PZ, the support surface 11 is not required on the end surface 7a side of the PCa member 7, and the support work is reduced as compared with the configuration in which the PCa member 7 is supported only by the support work. Is possible. Thereafter, the next column member 20 is constructed.

  As another example of the support work 11, for example, a support structure 11 'shown in FIG. The support structure 11 ′ shown in the figure is supported by the adjacent column member 20 on the end surface 7 b side of the PCa member 7, and includes an L-shaped angle member 90. One flat plate portion of the angle member 90 is provided with a screw hole into which the bolt 91 is screwed, and the tip of the bolt 91 supports the bottom surface of the PCa member 7 through the cap 93. A hole through which the bolt 92 is inserted is provided in the other flat plate portion of the angle member 90, and an insert into which the bolt 92 is screwed is embedded in the upper portion of the column member 20. The angle member 90 is fixed to the column member 20 by fastening the bolt 92, and the level of the PCa member 7 can be adjusted by the bolt 91. By adopting the support structure 11 ′, it is not necessary to construct the support work 11 from the floor slab, and the number of man-hours can be reduced.

  Return to explanation of construction procedure. As shown in FIG. 5A, the PCa member 6 is lifted by a crane or the like and moved onto the existing column member 20 and the support work 11. The PCa member 6 is moved in a state where the beam main bar 63 is inserted into the sheath tube 62. Thereby, it becomes possible to reduce a man-hour compared with the case where the PCa member 6 and the beam main reinforcement 63 are moved separately. When the beam main bar 63 is highly slidable in the sheath tube 62, the beam main bar 63 may slide out of the sheath pipe 62 depending on the posture of the PCa member 6 when it is moved. Therefore, for example, as shown in FIG. 2D, the end of the sheath tube 62 may be temporarily closed with a lid 10. The lid 10 is a plate-like member, and is fixed to the end surface of the PCa member 6 (the end surface 6b in the example of FIG. 2D. The end surface 6a may be the same) by screwing or the like. Thereby, it can prevent that the beam main reinforcement 63 begins to slide out.

  Returning to FIG. 5, the PCa member 6 is lowered onto the column member 20 and the support work 11 as shown in FIG. At this time, the column / beam joint PZ is mounted on the column member 20 while inserting the column main reinforcement 21 into the column main reinforcement insertion portion 65 described above. The PCa member 6 and the PCa member 7 are in a state in which they are arranged so that their joint surfaces 6a and 7b face each other with the joint space S therebetween. The joint material 5 shown in FIG. 1 is finally injected into the joint space S. Therefore, the joint space S is a gap of about several tens of millimeters.

  Next, the process proceeds to the step of sliding the beam main bars 63. As shown in FIG. 6A, the main bar insertion jig 9 is inserted into the sheath tube 62 from the end face 6b side, and the beam main bar 63 is pushed out to the PCa member 7 side. In the present embodiment, the main bar insertion jig 9 is used as the beam main bar 9 (FIG. 1), but may be used exclusively for the jig.

  When it is difficult to push the main bar insertion jig 9 into the sheath tube 62 with human power, a simple mechanism can be constructed to perform the work. FIG. 4B shows an example. The pushing assist mechanism 94 shown in the figure includes rings 94a and 94b temporarily fixed to the end surface 6b, a ring 94c temporarily fixed to an end of the main bar insertion jig 9, and a string body 94d such as a wire. One end of the string 94d is locked to the ring 94a, and the other end is pulled in the direction of the arrow through the ring 94c and the ring 94b in this order. Then, a force in the direction of insertion into the sheath tube 62 acts on the main muscle insertion jig 9, and the main muscle insertion jig 9 can be pushed into the sheath tube 62. A spacer 9 a similar to the spacer 66 is mounted on the main bar insertion jig 9, and the beam main bar 63 can be slid by the end of the main bar insertion jig 9 coming into contact with the end of the beam main bar 63.

  Returning to FIG. 6, the main beam 63 of the beam enters the sheath tube 72 of the PCa member 7 and is pushed to a position where the distal end of the main beam 63 overlaps the accessory bar 74 as shown in FIG. 6B. The beam main reinforcement 63 is in a state of being disposed in the sheath tubes 62 and 72 from the middle portion of the beam portion BM of the PCa member 6 to the middle portion of the PCa member 7. Thereafter, the main bar insertion jig 9 is extracted from the sheath tube 62, and the process proceeds to the step of FIG.

  In the process of FIG. 7A, the PCa member 8 is lifted by a crane or the like and moved onto two existing column members 20 that are already installed. The PCa member 8 is moved in a state where the beam main bar 83 is inserted into the sheath tube 82. At that time, as described for the PCa member 6, the end of the sheath tube 82 may be temporarily closed with a lid. Subsequently, the PCa member 8 is lowered onto the two column members 20. At this time, each column / beam joint PZ is mounted on the corresponding column member 20 while inserting the column main reinforcement 21 into the column main reinforcement insertion portion 85 described above. Since both ends of the PCa member 8 are supported by the column members 20, no support work is required. The PCa member 6 and the PCa member 8 are arranged such that their joint surfaces 6b and 8a are opposed to each other with the joint space S therebetween.

  Next, the process moves to the step of sliding the beam main bars 83. The procedure is the same as that for the PCa member 6. As shown in FIG. 7B, the main bar insertion jig 9 is inserted into the sheath tube 82 from the end face 8b side, and the beam main bar 83 is pushed out to the PCa member 6 side. The beam main bar 83 enters the sheath tube 62 of the PCa member 6 and is pushed to a position where the tip side overlaps the accessory bar 64. The main beam bars 83 are disposed in the sheath tubes 62 and 82 from the middle part of the beam part BM of the PCa member 6 to the middle part of the PCa member 8. The main bar insertion jig 9 is used as the beam main bar 9 without being extracted from the sheath tube 82, and is in the state shown in FIG.

  Thereafter, the operation of injecting the grout material G into the sheath tubes 62, 72, and 82 and the operation of injecting the joint material into the joint space S are performed, and the state shown in FIG. After the strength of the grout material G and the joint material appears, when the support 11 is removed, the state shown in FIG. 1 is obtained. A lap joint with a supplementary bar 74 is formed between the beam main bar 73 and the beam main bar 63. A lap joint with a supplementary bar 64 is formed between the beam main bar 63 and the beam main bar 83. Between the beam main bar 83 and the beam main bar 9, a lap joint by the auxiliary bar 84 is formed.

  As described above, in the present embodiment, since the PCa members 6 to 8 have the column / beam joints PZ, the existing column members 20 can be used to support the PCa members 6 to 8, and the support work 11. Can be reduced. There is no part of the concrete that is on-site, and full PCa can be realized, saving labor and shortening the construction period. Moreover, since the joint part 5 is not located in the center part of the beam 3, but located in the edge part, the influence which it has on an exterior design can be reduced.

<Second embodiment>
In the first embodiment, the beam main reinforcement from the midway portion of the PCa member 6 to the end face 8b of the PCa member 8 is configured as a two-member configuration of the beam main reinforcement 83 and the beam main reinforcement 9, but may be a one-member configuration. In this case, since the joint between the beam main bars is not required in the PCa member 8, the supplementary bar 84 is not required. 9A and 9B are explanatory diagrams thereof. In the example of the figure, a PCa member 8 ′ is employed instead of the PCa member 8 of the first embodiment. The PCa member 8 ′ has a configuration in which the splicing bar 84 is omitted from the PCa member 8, and the other parts are the same.

  FIG. 9A shows a step of inserting the beam main bar 83 'into the sheath tube 82, which replaces the step of FIG. 7B of the first embodiment. The beam main bar 83 ′ has a total length of the beam main bar 83 and the beam main bar 9, and is inserted into the sheath tube 82 from the end face 8b side. As shown in FIG. It will be in the state extended from the site | part to the end surface 8b of the PCa member 8.

  The beam main bar 83 ′ may be inserted in advance into the sheath tube 82 of the PCa member 8 and moved together with the PCa member 8 when the PCa member 8 moves. In this case, a part of the PCa member 8 protrudes.

<Third embodiment>
A beam member in a direction orthogonal to the span direction of the beam portion BM can be connected by providing a sheath tube in the column / beam joint PZ in a direction orthogonal to the span direction of the beam portion BM. 10A and 10B show an example of the connection example. In the figure, arrows X and Y indicate horizontal directions orthogonal to each other, and an arrow Z indicates a vertical direction.

  The PCa member 6 ′ is a member having a configuration in which a sheath tube 67 is added to the PCa member 6 described above. The PCa members 6 ′ are arranged so that the span direction of the beam portion BM is the X direction, and are joined in a row in the X direction by the joining procedure exemplified in the first embodiment and the second embodiment. A plurality of rows of PCa members 6 ′ are arranged in a spaced manner in the Y direction, and there are three rows in the examples of FIGS. 10A and 10B.

  The PCa members 100 are joined between the rows of the PCa members 6 '. The span direction of the PCa member 100 is the Y direction, and is joined between the column / beam joints PZ via the joints 5.

  The sheath tube 67 is provided in the Y direction so as to pass through the main beam of the PCa member 100, and penetrates between the side surfaces of the column / beam joint PZ. Since the above-described sheath tube 62 is embedded in the PCa member 6 ′ (not shown in FIGS. 10A and 10B), the sheath tube 67 is embedded at a position where it does not interfere with the sheath tube 62.

  Referring to FIG. 10C, the PCa member 100 has a configuration in which the column / beam joint portion PZ is removed from the PCa member 6 and the PCa member 8 described above, and end surfaces 100a and 100b (both are joint surfaces). , Member concrete 101, a plurality of sheath tubes 102, and a plurality of accessory bars 104. The sheath tube 102 is disposed at a position corresponding to the sheath tube 67.

  Referring to FIG. 10B, beam main bars 111 and 113 have a length obtained by adding half of the total length of PCa member 100 and the width (Y direction) of column / beam joint PZ of PCa member 6 ′. The beam main bar 112 has a length obtained by adding the entire length of the PCa member 100 and the width of the column / beam joint PZ.

  With reference to FIGS. 11-13, the example of the construction procedure of the frame structure shown to FIG. 10 (A) and (B) is demonstrated. Here, the case where it constructs in order from the left side in FIG.10 (B) is assumed.

  As shown in FIG. 11A, the PCa members 6 ′ on the left column are lifted and the column / beam joints PZ are installed on the column member 20 on the left side. The beam portion BM is supported by a support work (not shown). Subsequently, the PCa member 100 is lifted and installed on the support work 11 disposed at both ends thereof. The PCa member 6 ′ and the PCa member 100 are arranged such that their joint surfaces (the side surfaces of the column / beam joint PZ and the end surface 100 a) face each other with the joint space S therebetween.

  The beam main reinforcement 111 is inserted into the sheath tube 67 from the side surface of the column / beam joint PZ. As shown in FIG. 11 (B), the beam main reinforcing bar 111 enters the sheath tube 102 of the PCa member 100 and is pushed to a position where the distal end side overlaps the accessory bar 104. The beam main reinforcing bars 111 are disposed in the sheath tubes 67 and 102 from the midway portion of the PCa member 100 to the side surface (outside) of the PCa member 6 ′.

  Next, as shown in FIG. 12A, the PCa members 6 ′ in the center row are lifted and the column / beam joints PZ are set on the center column member 20. Moreover, the next PCa member 100 is lifted and installed on the support work 11 arrange | positioned at the both ends. The PCa member 100 installed last time and the PCa member 6 ′ installed this time are arranged so that their joint surfaces (the end surface 100 b and the side surface of the column / beam joint PZ) face each other with the joint space S therebetween. It becomes a state. Also, the PCa member 6 ′ installed this time and the PCa member 100 installed this time are arranged so that their joint surfaces (side surfaces 100a of the column / beam joint PZ) face each other with the joint space S therebetween. It becomes a state.

  Using the beam main bar 113 as the main bar insertion jig, the beam main bar 112 inserted in the sheath tube 102 of the PCa member 100 installed this time is slid. As shown in FIG. 12B, the beam main bar 112 passes through the sheath tube 67 of the PCa member 6 ′ in the center row, and is pushed to a position where the tip side overlaps with the accessory bar 104 of the PCa member 100 installed last time. The main beam 112 of the beam is disposed in the sheath tubes 102, 67, 102 from the middle part of the PCa member 100 installed last time through the middle part of the PCa member 100 installed this time through the PCa member 6 'in the center row. It becomes a state. Thereafter, the beam main bar 113 used as the main bar insertion jig is extracted from the sheath tube 102, and the process proceeds to the step of FIG.

  In the step of FIG. 13A, the PCa members 6 ′ in the right row are lifted and the column / beam joints PZ are installed on the right column member 20. The PCa member 100 installed last time and the PCa member 107 installed this time are arranged so that their joint surfaces (the end surface 100b and the side surface of the column / beam joint PZ) face each other with the joint space S therebetween. It becomes.

  The beam main bar 113 is inserted into the sheath tube 67 from the side surface (outside) of the column / beam joint PZ of the PCa member 6 ′ in the right row. As shown in FIG. 13B, the beam main bar 113 passes through the sheath tube 67 of the PCa member 6 ′ installed this time, and is pushed to a position where the tip side overlaps with the accessory bar 104 of the PCa member 100 installed last time. The main beam bars 113 are arranged in the sheath tubes 102 and 67 from the middle part of the PCa member 100 installed last time to the side surface of the PCa member 6 ′ installed this time.

  Thereafter, the operation of injecting the grout material G into the sheath tubes 67 and 102 and the operation of injecting the joint material into the joint space S are performed. After the strength of the grout material G and the joint material has appeared, the state shown in FIG. A lap joint by the supplementary bar 104 is configured between the beam main bar 111 and the beam main bar 112 and between the beam main bar 112 and the beam main bar 113.

  In the present embodiment, the PCa member 6 ′ in which the sheath tube 67 is added to the PCa member 6 is illustrated, but a sheath tube corresponding to the sheath tube 67 can be added to the PCa member 7 and the PCa member 8 as well. is there.

  It is also possible to connect two types of PCa members arranged at right angles to each other so that the X- and Y-direction beam principal bars and the sheath tube do not interfere with each other with the same configuration as the PCa member 6 '. FIG. 14 shows an example. The PCa member 6A and the PCa member 6B have the same configuration as that of the PCa member 6 ', but are different in the arrangement of the sheath tubes 62 and 67 described above. By joining the PCa member 6A in the X direction and joining the PCa member 6B in the Y direction, the above-described joining structure can be realized, and an outer peripheral frame can be constructed with two types of PCa members.

BM Beam part G Grout material PZ Column / beam joint S Joint space 5 Joint parts 6-7, 6 ', 6A, 6B, 100 PCa members 62, 67, 72, 82, 102 Sheath tubes 9, 63, 73, 83 , 111-113 Beam main bars 64, 74, 84, 104 Supplementary bars

Claims (4)

A first PCa member including a column-beam joint and a beam portion for one span;
A second PCa member joined to one joint surface of the first PCa member via a joint portion;
A third PCa member joined to the other joint surface of the first PCa member via a joint,
The first PCa member is:
A first sheath tube penetrating between the one joining surface and the other joining surface;
In the middle part of the beam portion, with a supplementary bar provided along the first sheath tube,
The second PCa member includes a second sheath tube opened at a joint surface with the first PCa member,
The third PCa member includes a third sheath tube opened at a joint surface with the first PCa member,
In the first sheath tube,
One beam main bar extending from the midway part of the beam portion to the second sheath tube,
The other beam main bar extending from the middle part of the beam part to the third sheath tube is inserted,
Grout material is injected into the sheath tube so that the one beam principal bar and the other beam principal bar constitute a lap joint with the accessory bar,
A junction structure characterized by that. The joint structure according to claim 1,
The column / beam joint of the first PCa member is provided on the first column member,
The second PCa member includes at least a column / beam joint provided on a second column member adjacent to the first column member, and a beam portion for one span,
The third PCa member includes at least a column / beam joint provided on a third column member adjacent to the first column member, and a beam portion for one span.
A junction structure characterized by that. A PCa member,
At least one column / beam joint;
A span of beams,
A sheath tube penetrating between one end surface and the other end surface of the PCa member;
In the middle portion of the beam portion, with a supplementary muscle provided along the sheath tube,
PCa member characterized by the above. A PCa member,
A span of beams,
Column / beam joints,
A sheath tube that opens to an end surface of the beam portion of the PCa member and is disposed up to an intermediate portion of the beam portion;
A beam main bar extending from the intermediate portion of the beam portion to an end surface of the PCa member on the column / beam joint side;
In the middle portion of the beam portion, provided with the sheath tube and an accessory bar provided along the beam main bar,
PCa member characterized by the above.

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