JP6385858B2 - Construction method of composite ramen structure - Google Patents

Description

  The present invention relates to a method for constructing a composite rigid frame structure using different-strength concrete in which the inside of a cross section is made of high-strength concrete and the outer periphery of the cross-section is made of relatively low strength concrete.

  In recent years, research and development on increasing the strength of concrete has been actively conducted, and concrete strength has been dramatically increased by reducing the water cement ratio with high-performance AE water reducing agents and reducing the water binder ratio by blending various admixtures. It has become. The strength of high-strength concrete (design standard strength) depends on the type of cement and admixture, but generally increases as the water binder ratio decreases. Such high strength of concrete makes it possible to increase the height of buildings and reduce the cross section of columns, and is now widely used in high-rise buildings.

  As an example of using high-strength concrete as a column, the outer part of the column is formed by a precast (hereinafter referred to as PCa) concrete member using ultra-high-strength concrete, and the inside of the outer shell is hollow or low-strength concrete. Is known (see Patent Documents 1 and 2).

  On the other hand, it has been pointed out that the surface of high-strength concrete tends to explode in the event of a fire due to the dense structure. Therefore, the present applicant has arranged a column core portion made of high-strength concrete inside the cross section of the column as a composite column structure that can ensure fire resistance and effectively suppress the occurrence of cracks, and the outer peripheral portion of the column cross section. In addition, an invention has been proposed in which a column outer peripheral portion made of low-strength concrete is disposed so as to cover the entire side surface of the column core portion, and a main bar is disposed only on the column outer peripheral portion (see Patent Document 3).

  In addition, although main bars are arranged inside high-strength concrete, PCa concrete members made of high-strength concrete are used for pillars and beam cores, and cast-in-place concrete is placed to cover the PCa concrete core members. A method of constructing a composite reinforced concrete structure is also known (see Patent Document 4).

JP 2006-233548 A JP 2004-332236 A JP 2014-58820 A JP 58-199957 A

  However, in patent document 4, the pillar and the beam are integrated by hitting concrete on the outer periphery of the column and the beam together. For this reason, the amount of on-site concrete placement is large, and construction takes time and effort. On the other hand, Patent Documents 1 to 3 are for the purpose of increasing the strength of a column, and high-strength concrete is also used for the beam in order to reduce the cross section of the beam or to improve the shear strength and bending strength. The case is not considered. That is, when using high-strength concrete for the core of each column and beam and using PCa concrete for parts other than high-strength concrete, the connection structure between the beam and column and the construction method of such a composite ramen structure are: Not established.

  The present invention has been made in view of such a background, and in a composite rigid frame structure made of different strength concrete in which the inside of the cross section is made of high strength concrete and the outer periphery of the cross section is made of relatively low strength concrete, both are made of high strength concrete. It is an object of the present invention to provide a construction method capable of connecting the beam core portion and the column core portion, which is easy to construct, and capable of shortening the construction period.

  In order to solve the above-described problems, the present invention has a column (1) and a beam (2) that are rigidly connected to each other, and the column core portion (1i) and the beam core portion (2i) arranged inside the member cross section are predetermined. Column outer peripheral portion (1o) and beam outer peripheral portion (made of high-strength concrete having a water binder ratio and strength, and arranged at the outer peripheral portion in the member cross section so as to cover the outer peripheral surfaces of the column core portion and the beam core portion ( 2o) is a method for constructing a composite rigid frame structure (100) in which the ratio of water binder is higher and the strength is lower than that of the high-strength concrete, and the beam core (2i) is connected to the column core (1i). provide.

  In order to solve the above-described problems, the present invention provides a PCa concrete member (11, 10 (10c, 10d)) directly below a joint core (10a) that forms a connection between the column core and the beam core on a predetermined floor. 30 (31)) is positioned so that the column core portion (1i) is positioned, and the upper end of the column outer peripheral portion (1o) reaches at least a position corresponding to the lower surface of the beam core portion. 1) constructing at least the upper part (FIG. 6), and the beam outer peripheral part (2o) so that the beam core part (2i (21)) forms a recessed part (23) opening laterally at both ends in the axial direction. A step of preparing a PCa composite beam member (20) formed shorter than (22)) and having the beam outer peripheral portion (2o (22)) cut out so that the recessed portion (23) also opens on the upper surface. (Fig. 7E) In the floor, placing the PCa composite beam member (20) around the pillar (1) (FIG. 7E), at least the joint core (10a), and extending laterally from the joint core. A PCa finish in which a beam core end portion (10b) to be extended and a column core lower portion (10c) extending upward from the joint core portion and constituting at least the lower portion of the column core portion (1i) on the upper floor are integrally formed. In the step of preparing the core member (10) (FIG. 7E) and the predetermined floor, the beam core end portion (10b) of the PCa joint core member (10) is arranged around the column (1). Arranging the PCa joint core member (10) on the column (1) so as to be accommodated and supported in the recessed portion (23) of the PCa composite beam member (20) (FIG. 7F) And the PCa joint core member (10) arranged Step of constructing at least the lower part of the pillar (1) on the upper floor by constructing the pillar outer peripheral part (2o) on the upper floor so as to cover the outer peripheral surface of the core lower part (10c) (FIGS. 6 and 7G) It is set as the structure containing these.

  Here, high-strength concrete is concrete that achieves high strength by having a relatively low water binder ratio, and does not include concrete that achieves high strength by mixing substances other than the binder. Further, the term “support” does not mean that a vertical load is supported, but means a support that is used exclusively to prevent the member from overturning.

  According to this configuration, it is possible to connect the beam core part and the column core part, both of which are made of high-strength concrete, and to reduce the amount of construction of on-site concrete, formwork assembly, rebar assembly, etc. It can be shortened.

  Further, according to the present invention, in the above-described configuration, the step of constructing at least the lower part of the column (1) (FIGS. 6 and 7G) is a hole (13L, 13, 33) that opens at least downward in the column cross section. And a step (FIGS. 6A and 7G) of preparing PCa column members (12L, 12, 30) constituting at least the lower part of the column outer peripheral portion (1o), and the arranged PCa joint core member ( 10), the PCa column member (12L, 12, 30) is inserted into the hole (13L, 13, 33) from below so as to enter the hole (13L, 13, 33) from below. And a step (FIG. 6B, FIG. 7G) that is disposed above and supported by the lower part of the column core (10c).

  According to this configuration, the lower PCa column outer peripheral member 12L can be easily prevented from falling, and the arrangement work of the lower PCa column outer peripheral member 12L is facilitated.

  Moreover, this invention is the said structure, The said column outer peripheral part (1o) of the said PCa pillar member (12L) has the height corresponding to a half-level floor height, and constructs at least the upper part of the said pillar. Step (FIG. 6) is a step (FIG. 6B) of preparing a PCa column core member (11) constituting an upper portion of the column core portion (1i) not including the joint core portion (10a), and the column core. A step of inserting a PCa column core member (11) into the hole (13L) formed so as to open on the upper surface of the PCa column member (12L) supported by the lower portion (10c) and supporting the PCa column member (11L). (FIG. 6B) and a step of preparing an upper PCa column member (12U) in which a through-hole (13U) penetrating the inside in the column cross section is formed and constituting at least the upper portion of the column outer peripheral portion (1o) (FIG. 6C) and the PCa The upper PCa column member (12U) is placed on the PCa column member (12L) so that the PCa column core member (11) supported by the member (12L) enters the through hole (13U) from below. And a step (FIG. 6D) of arranging and supporting the PCa column core member (11).

  According to this configuration, the weight of each of the PCa column member and the upper PCa column member constituting the column outer periphery of each floor can be reduced to facilitate handling, and the upper PCa column member can be easily prevented from falling. The construction work (placement work) of the outer peripheral portion becomes easy.

  Further, according to the present invention, in the above configuration, the column outer peripheral portion (1o) of the PCa column member (12L, 12, 30) has a height corresponding to a floor height of one level, and the column (1 The step of constructing at least the lower part (FIG. 7G) and the step of constructing at least the upper part of the pillar (1) (FIG. 6) can be performed as the same step.

  According to this structure, the man-hour for constructing | assembling a pillar outer peripheral part can be reduced, and the construction work of a composite pillar can be made easier.

  In order to solve the above-mentioned problem, the present invention provides a method for constructing the composite ramen structure (100), wherein the pillar core protrudes upward from the upper surface of the pillar outer peripheral part (1o) on a predetermined floor. A step of constructing at least the lower part of the portion (1i) (FIG. 6A), and holes (13L, 13, 33) that open at least downward are formed inside the column cross section, and at least the lower part of the column outer peripheral part (1o) is formed Steps (FIGS. 6A to 6C) for preparing PCa column members (12L, 12, 30) to be configured, and the column core portion (2i) constructed so as to protrude upward are formed from the bottom (13L, 13, 33) placing the PCa column member (12L, 12, 30) on the predetermined floor and supporting the column core portion (1i) so as to enter (33B), and at least the column Core and said A splicing core portion (10a) that forms a connecting portion with the core portion, a beam core end portion (10b) that extends laterally from the splicing core portion, and extends upward from the splicing core portion. A step (FIG. 7E) of preparing a PCa joint core member (10) integrally formed with a column core lower portion (10c) constituting at least a lower portion of the column core portion (1i), and the beam core end portion (10b) The PCa joint core member (10) is disposed on the PCa column member (12U, 12) disposed on the predetermined floor so as to be supported, and the PCa joint core member (10) disposed. A step (FIG. 7F) of constructing at least the lower part of the column core part (1i) on the upper floor by the column core lower part (10c).

  According to this configuration, the beam core portion and the column core portion, both of which are made of high-strength concrete, can be connected, and the PCa column member can be prevented from falling, facilitating the construction work of the composite column and shortening the construction period.

  As described above, according to the present invention, there is provided a method for constructing a composite rigid frame structure using different-strength concrete that can connect a beam core portion and a column core portion, both of which are made of high-strength concrete, and that can be easily constructed and shorten the construction period. Can do.

Side view of the composite rigid frame structure according to the first embodiment 1 is an exploded perspective view of the main part of the composite ramen structure shown in FIG. Sectional drawing of the PCa composite pillar member shown along line III-III in FIG. Sectional view of the PCa composite beam member taken along line IV-IV in FIG. Sectional view showing the composite ramen structure under construction along the vertical plane Explanatory drawing of construction procedure of composite ramen structure shown in FIG. Explanatory drawing of construction procedure of composite ramen structure shown in FIG. Side view of the construction state of the composite ramen structure according to the second embodiment Side view of the state of construction of the composite ramen structure according to the third embodiment Side view of the state of construction of the composite rigid frame structure according to the fourth embodiment Side view of the construction state of the composite ramen structure according to the fifth embodiment Side view of the construction state of the composite rigid frame structure according to the sixth embodiment Side view of the construction state of the composite ramen structure according to the seventh embodiment

  Hereinafter, the composite ramen structure 100 and the construction method thereof according to the present invention will be described in detail with reference to the drawings by giving some embodiments.

<< First Embodiment >>
First, a first embodiment will be described with reference to FIGS. As shown in FIG. 1, a composite rigid frame structure 100 includes a plurality of composite columns 1 and a plurality of composite beams 2 that are spanned between a pair of adjacent composite columns 1, 1 and that are rigidly coupled to the composite columns 1 at both ends. have. In the composite ramen structure 100, composite pillars 1 are arranged along two directions orthogonal to each other on a plane, and a pair of adjacent composite pillars 1 and 1 are connected by a composite beam 2 extending along each direction. . FIG. 1 shows only one of them.

  The composite ramen structure 100 is made of high-strength concrete in which the inside of each cross section of the composite column 1 and the composite beam 2 (hereinafter referred to as the column core part 1i and the beam core part 2i) has a relatively low water binder ratio and a relatively high strength. Each of the composite column 1 and the composite beam 2 has a cross-section outer peripheral portion (hereinafter referred to as a column outer peripheral portion 1o and a beam outer peripheral portion 2o) having a water bonding material ratio higher than that of the cross-section inside and a concrete having a relatively low strength (hereinafter referred to as a cross-section outer periphery). Is a composite concrete structure composed of ordinary concrete). Here, high-strength concrete means concrete having a lower water binder ratio and higher strength than ordinary concrete, and does not define an upper limit value or a lower limit value of strength of the water binder ratio.

  In this embodiment, the column core part 1i and the column outer peripheral part 1o are comprised by separate PCa concrete members, and the composite pillar 1 is constructed | assembled by stacking and integrating these sequentially. The column core portion 1i includes a PCa joint core member 10 and a PCa column core member 11 which will be described in detail later. The column outer peripheral portion 1o is configured by a PCa column outer peripheral member 12 (details will be described later) (in this embodiment, an upper PCa column outer peripheral member 12U and a lower PCa column outer peripheral member 12L).

  The composite beam 2 is composed of the PCa composite beam member 20 having a length corresponding to the span of a pair of composite columns 1 adjacent in the axial direction as the composite column 1 (in this embodiment, the upper end of the upper PCa column outer peripheral member 12U and the PCa joint. It is constructed by being rigidly connected to the beam core end portion 10b (FIG. 2) of the core member 10. The detailed configuration of the PCa composite beam member 20 will be described later.

  As shown in FIG. 2, the column outer peripheral portion 1o for one layer is constructed by stacking two PCa column outer peripheral members 12 having a height corresponding to a half-level floor height. Hereinafter, the PCa column outer peripheral member 12 disposed on the lower side in each floor is referred to as a lower PCa column outer peripheral member 12L, and the PCa column outer peripheral member 12 disposed on the upper side in each floor is referred to as an upper PCa column outer peripheral member 12U. When they are not distinguished from each other, they are simply referred to as PCa column outer peripheral members 12. The PCa pillar outer peripheral member 12 is made of reinforced concrete made of ordinary concrete. As described above, the PCa composite beam member 20 has a length corresponding to the span of the composite column 1, but in FIG. Moreover, in order to avoid the figure from becoming complicated, various reinforcing bars, reinforcing bar insertion holes, reinforcing bar joints, and the like are omitted in FIG.

  The column core portion 1i for one layer is constructed by a PCa joint core member 10 and a PCa column core member 11 that is disposed on the PCa joint core member 10 and integrated with the PCa joint core member 10. The The PCa joint core member 10 includes a joint core portion 10a that forms a connection portion between the column core portion 1i and the beam core portion 2i, a beam core end portion 10b that extends laterally from the joint core portion 10a, and a joint core portion 10a. It is a substantially unreinforced PCa concrete member that extends upward from and is integrally formed of high-strength concrete with a column core lower portion 10c that constitutes about a quarter of the lower portion of the column core portion 1i on each floor. The joint core portion 10a and the column core lower portion 10c of the PCa joint core member 10 constitute about one third of the lower portion of the column core portion 1i on each floor. The PCa column core member 11 has the same cross-sectional shape as the connection core portion 10a and the column core lower portion 10c of the PCa connection core member 10, and constitutes about two thirds of the upper side of the column core portion 1i in each floor. It is a substantially unreinforced columnar PCa concrete member.

  The lower PCa column outer peripheral member 12L has a rectangular tube shape in which a through hole 13L penetrating in the vertical direction is formed inside the cross section. The lower PCa column outer peripheral member 12L is disposed at the upper surface height of the composite beam 2 on the floor side, and the lower column core portion 10c of the PCa joint core member 10 inserted into the through hole 13L and the lower portion of the PCa column core member 11 And the lower part of the column outer peripheral part 1o on each floor.

  The upper PCa column outer peripheral member 12U also has a rectangular tube shape in which a through hole 13U penetrating in the vertical direction is formed inside the cross section. The upper PCa column outer peripheral member 12U is disposed on the lower PCa column outer peripheral member 12L so that the upper end reaches at least a position corresponding to the lower surface of the composite beam 2 on the ceiling side. Here, the position corresponding to the lower surface includes a position that is low enough to form a joint (gap) as shown in FIG. Thereby, upper PCa pillar outer peripheral member 12U covers the outer peripheral surface of the upper part of PCa pillar core member 11 inserted in penetration hole 13U, and constitutes the upper part of pillar outer peripheral part 1o in each floor.

  In the present embodiment, the upper end of the upper PCa column outer peripheral member 12U substantially matches the upper surface height of the composite beam 2 on the ceiling side. As described above, the upper PCa column outer peripheral member 12U has a rectangular tube shape, but the beam core portion 2i (the beam core end portion 10b of the PCa joint core member 10) on the surface (four surfaces in the illustrated example) to which the composite beam 2 is connected. A corresponding portion is formed with a notch 14 penetrating the wall. The notch 14 is formed so as to reach a position corresponding to the upper end surface of the upper PCa column outer peripheral member 12U.

  In the present embodiment, the upper end of the upper PCa column outer peripheral member 12U substantially coincides with the upper surface height of the composite beam 2, and the upper end of the upper PCa column outer peripheral member 12U constitutes the column outer peripheral portion 1o of the joint portion. The upper end position of the column outer peripheral member 12U is higher than the upper end position of the PCa column core member 11. The joint core portion 10a of the PCa joint core member 10 is disposed inside the upper end of the upper PCa column outer peripheral member 12U (above the PCa column core member 11). Since the upper end of the upper PCa column outer peripheral member 12U coincides with the upper surface height of the composite beam 2, the upper part of the notch 14 extends to a position corresponding to the upper wall of the beam outer peripheral part 2o. After the beam core end portion 10b of the PCa joint core member 10 is disposed in the lower portion, the filler 5 made of concrete or mortar by in-situ casting is filled.

  Moreover, the height of the column core lower part 10c of the PCa column core member 11 is set to about one quarter of the composite column 1 on each floor, and the height of the lower PCa column outer peripheral member 12L is one half of the composite column 1 on each floor. Therefore, the upper end position of the lower PCa column outer peripheral member 12 </ b> L is also higher than the upper end position of the PCa joint core member 10.

  Except for the portion filled with the filler 5, the composite column 1 has the PCa column outer peripheral member 12 and the PCa column core member 11 or PCa inserted into the through hole 13 of the PCa column outer peripheral member 12 in any cross section. It is constituted by the joint core member 10. Although not shown, grout is injected between the PCa column outer peripheral member 12 and the PCa column core member 11 or the PCa joint core member 10 in order to integrate them.

  On the other hand, the PCa composite beam member 20 is an integrated PCa having a beam core main portion 21 arranged inside the cross section and a beam outer periphery main portion 22 arranged at the outer periphery of the cross section so as to cover the peripheral surface of the beam core main portion 21. It is a concrete member. The beam core main part 21 is made of a substantially unreinforced concrete made of high-strength concrete and constitutes the beam core part 2i. On the other hand, the beam outer periphery main part 22 is made of reinforced concrete made of ordinary concrete and constitutes the beam outer periphery 2o.

  The beam outer peripheral main portion 22 has a length corresponding to the span between the pair of composite columns 1 and 1. On the other hand, the beam core main portion 21 is shorter than the beam outer periphery main portion 22 by the length of the beam core end portion 10b of the PCa joint core member 10 at both ends in the axial direction. The portion where the beam core portion 2 i is missing forms a recessed portion 23 that recesses the end face of the PCa composite beam member 20. Further, a portion corresponding to the recessed portion 23 in the upper portion (upper wall portion) of the beam outer peripheral main portion 22 is cut out so as to extend the recessed portion 23 upward. Thereby, the recessed part 23 is opened to the end surface and upper surface of the beam outer peripheral main part 22. A beam core end portion 10 b of the PCa joint core member 10 connected to the beam core main portion 21 is disposed below the recessed portion 23. The recessed portion 23 is filled by filling the filler 5 in the upper portion (on the beam core end portion 10b) after the beam core end portion 10b is disposed in the lower portion. Thereby, the part in which the recessed part 23 of the beam outer periphery main part 22 was formed becomes the same cross-sectional shape as another part.

  As shown in FIG. 3, the column core portion 1i has a square cross-sectional shape, and the outer edge of the column outer peripheral portion 1o covering the entire side surface of the column core portion 1i also has a square cross-sectional shape. The column core portion 1i and the column outer peripheral portion 1o are integrated by a grout (not shown) injected between them. Since the column core portion 1i is made of a substantially unreinforced concrete as described above, the high-strength concrete freely self-shrinks when the PCa column core member 11 and the PCa joint core member 10 are manufactured. And the occurrence of cracks is suppressed.

  On the other hand, the column outer peripheral portion 1o is reinforced concrete made of ordinary concrete as described above. A plurality of (20 in this case) column main bars 16 are arranged in the vicinity of the outer peripheral edge of the composite column 1 and extend in the axial direction, and a predetermined interval in the axial direction so as to surround the plurality of column main bars 16. A plurality of rectangular strip reinforcing bars 17 (shear reinforcement bars) arranged at a distance are embedded. The column main reinforcing bars 16 and the strip reinforcing bars 17 are arranged only on the column outer peripheral portion 1o.

  As described above, the composite column 1 is formed of high-strength concrete in a part of the cross section, so that the high-strength concrete is not used (the entire cross-section is formed by ordinary concrete forming the column outer peripheral portion 1o). Compared to the embodiment), the compressive strength can be increased, and the column cross-sectional area necessary for obtaining the same compressive strength can be reduced. Further, since the column core portion 1i made of high-strength concrete is covered with the column outer peripheral portion 1o, the surface portion of the composite column 1 is less likely to explode at the time of a fire, and the fire resistance performance of the composite column 1 is ensured. Yes.

  In addition, the column core part 1i does not need to be perfect unreinforced concrete, and the unreinforced concrete said here does not contain the column main reinforcement 16 and PC steel materials which restrain the self-shrink of the high-strength concrete in the axial direction. Means. Accordingly, the column core portion 1i has a structure in which reinforcing bars that are not considered in the structural calculation, such as setup bars, steel hooks for lifting, etc., are embedded even if the reinforcing bars extend in the axial direction. Also good.

  As shown in FIG. 4, the beam core portion 2i has a vertically long rectangular cross-sectional shape, and the outer edge of the beam outer peripheral portion 2o covering the outer peripheral surface of the beam core portion 2i also has a vertically long rectangular cross-sectional shape. Either the beam core portion 2i or the beam outer peripheral portion 2o may be formed first (concrete placement). However, since the beam core portion 2i is made of a substantially unreinforced concrete as described above, high strength concrete is used. In order to prevent cracking by freely self-shrinking, it is preferable to first form the beam core portion 2i using high-strength concrete and construct the beam outer peripheral portion 2o later using ordinary concrete. The beam core portion 2i and the beam outer peripheral portion 2o are integrated by adhesion of concrete on the side to be placed later.

  A plurality of (in this case, eight) beam main bars 26 arranged in the vicinity of the outer peripheral edge of the composite beam 2 and extending in the axial direction are disposed inside the beam outer peripheral portion 2o and surround the plurality of beam main bars 26. A plurality of rectangular barbs 27 (shear reinforcement bars) arranged at predetermined intervals in the direction are embedded. The main beam reinforcement 26 and the reinforcing bar 27 are disposed only on the outer periphery 2o of the beam.

  The beam core portion 2i does not need to be completely unreinforced concrete like the column core portion 1i, and does not have to include the beam main reinforcement 26 or the PC steel material that restrains the self-shrinkage of the high-strength concrete in the axial direction. The beam core main portion 21 has a configuration in which a width-retaining bar, a steady-rest bar extending in the cross-sectional direction, a bending bar that penetrates obliquely, or the like, or a reinforcing bar that is not considered in the structural calculation extending in the axial direction is embedded. It may be.

  FIG. 5 shows a longitudinal section in a state where the PCa column core member 11, the upper PCa column outer peripheral member 12U, the PCa composite beam member 20 and the PCa joint core member 10 are arranged at predetermined positions and the above-mentioned cast-in-place concrete is not placed. A plane view is shown. As shown in the drawing, a concave portion 3a and a convex portion 3b constituting the cotter joint 3 are formed on the upper surface of the PCa column core member 11 and the lower surface of the joint core portion 10a of the PCa joint core member 10, respectively. The PCa column core member 11 and the PCa joint core member 10 are integrated by filling the joint with a high-strength grout. Further, on each of the end surface of the beam core main portion 21 of the PCa composite beam member 20 and the end surface of the beam core end portion 10b of the PCa joint core member 10, a recess 4a constituting the cotter type joint 4 is formed. The beam core end portion 10b of the PCa joint core member 10 and the beam core main portion 21 of the PCa composite beam member 20 are integrated by filling the joint and the recess 4a with high-strength grout. Further, the beam outer periphery main portion 22 of the PCa composite beam member 20 and the upper PCa column outer periphery member 12U are integrated by the grout filled in the joint and the filler 5 filled in the recessed portion 23 and the notch 14.

  Although not shown, the beam main reinforcement 26 (FIG. 4) disposed on the upper side has a length that does not protrude from the end surface of the beam outer peripheral main portion 22 into the recessed portion 23, and a sleeve joint is provided at the end portion. ing. The upper beam main reinforcement 26 is fixed inside the composite column 1 by connecting the extended beam main reinforcement arranged above the beam core end portion 10b via the sleeve joint after the PCa joint core member 10 is arranged. Or, it is connected to the beam main reinforcement 26 of the composite beam 2 disposed so as to face the composite column 1.

  Next, the construction procedure of the composite ramen structure 100 will be described with reference to FIGS.

  First, as shown in FIG. 6 (A), on the upper surface of the composite column 1 or foundation on a predetermined floor, the lower part (columns) of the column core portion 1i protruding above the upper surface of the composite beam 2 on the floor side or the foundation beam. A core lower part 10c) is constructed. A lower PCa column outer peripheral member 12L prepared in advance as a PCa concrete member is hung from above at a predetermined position so that the column core portion 1i enters the through-hole 13L from below with respect to the lower portion of the column core portion 1i. As shown in FIG. 6 (B), the lower PCa column outer peripheral member 12L is supported by the column core portion 1i by being disposed on (on the PCa joint core member 10). Here, “support” does not mean supporting a vertical load, but means support for preventing the members from overturning. In this state, since the protruding dimension of the column core portion 1i is smaller than the height dimension of the lower PCa column outer circumferential member 12L, the upper portion of the through hole 13L is a bottomed hole that opens on the upper surface of the lower PCa column outer circumferential member 12L. It will be in the state which remains in the upper part of 12 L of lower PCa pillar outer peripheral members.

  Thereafter, the PCa column core member 11 prepared in advance as a PCa concrete member is inserted into the through hole 13L of the lower PCa column outer peripheral member 12L from above, so that the lower PCa column as shown in FIG. The PCa column core member 11 is supported on the outer peripheral member 12L. In this state, the PCa column core member 11 protrudes upward from the upper surface of the lower PCa column outer peripheral member 12L, and the upper end thereof is the height of the lower surface of the beam core portion 2i (see FIG. 7E).

  Thereafter, the upper PCa column outer peripheral member 12U prepared in advance as a PCa concrete member is suspended from above so that the PCa column core member 11 enters the through hole 13U from below, and the upper PCa column outer peripheral member 12L 6D, the PCa column core member 11 supports the upper PCa column outer peripheral member 12U as shown in FIG. In this state, by injecting grout into the upper PCa column outer peripheral member 12U and the lower PCa column outer peripheral member 12L (a gap between the column core portion 1i), the column outer peripheral portion 1o and the column core portion 1i are integrated. . In addition, you may perform injection of grout whenever it arrange | positions a PCa concrete member. Moreover, it is good to provide a joint between the PCa concrete members arrange | positioned not only between the column outer peripheral part 1o and the pillar core part 1i but an up-down direction, and to fill a joint also with grout.

  After constructing the composite pillar 1 in this way, a support 6 for assembling the PCa composite beam member 20 around the composite pillar 1 is assembled, and as shown in FIG. The composite beam member 20 is disposed. Thereafter, the PCa splicing core member 10 prepared in advance as a PCa concrete member is suspended, and the PCa splicing core member 10 is supported so that the beam core end portion 10b is accommodated and supported in the recessed portion 23 of the PCa composite beam member 20. Is placed on the composite pillar 1 to a state shown in FIG. After the PCa composite beam member 20 is disposed, the filling material 5 made of concrete or mortar is filled in the concave portion 23 of the PCa composite beam member 20 and the upper portion of the notch 14 of the upper PCa column outer peripheral member 12U, so that the composite of this floor Construction of pillar 1 is completed. In this state, the column core lower portion 10c of the PCa joint core member 10 constitutes the lower portion of the column core portion 1i protruding upward from the upper surface of the composite beam 2 on the ceiling side, and the state shown in FIG. It becomes the same state as.

  Subsequently, also on the upper floor, as shown in FIG. 7G, the lower PCa column outer peripheral member 12L is hung from above so that the column core portion 1i enters the through hole 13L from below, and is moved to a predetermined position (PCa finish). The lower PCa column outer peripheral member 12L is supported by the column core portion 1i by being disposed on the wick member 10). This procedure is the same as that described with reference to FIG. 6A, and by repeating these procedures, a multilayer composite ramen structure 100 is constructed.

  By constructing the composite ramen structure 100 in this way, the following effects can be obtained.

  That is, as shown in FIG. 6, the column core portion 1i formed by the PCa column core member 11 is positioned directly below the joint core portion 10a, and the upper end of the upper PCa column outer peripheral member 12U is at least the beam core portion 2i. The composite pillar 1 is constructed so as to reach the position corresponding to the lower surface, and as shown in FIG. 7 (E), the PCa composite beam member 20 is arranged around the composite pillar 1, and as shown in FIG. 7 (F). The PCa joint core member 10 is disposed on the composite column 1 so that the beam core end portion 10b is accommodated and supported in the recessed portion 23 of the PCa composite beam member 20, and as shown in FIG. The column outer peripheral portion 1o is constructed on the upper floor so as to cover the outer peripheral surface of the column core lower portion 10c of the joint core member 10. This makes it possible to connect the beam core part 2i and the column core part 1i, both of which are made of high-strength concrete, and reduces the amount of construction for on-site concrete, formwork assembly, rebar assembly, etc. can do.

  In particular, when constructing at least the lower part of the composite pillar 1, as shown in FIGS. 6A and 7G, the pillar core lower part 10c of the PCa joint core member 10 enters the through hole 13L from below. As described above, the lower PCa column outer peripheral member 12L is disposed on the PCa joint core member 10 and supported by the column core lower portion 10c. Thereby, the fall of the lower PCa column outer peripheral member 12L can be easily prevented, and the arrangement work of the lower PCa column outer peripheral member 12L is facilitated.

  In this embodiment, the lower PCa column outer peripheral member 12L and the upper PCa column outer peripheral member 12U each have a height corresponding to a substantially half-level floor height, and when the upper portion of the composite column 1 is constructed, FIG. As shown in FIG. 6C, the PCa column core member 11 is inserted into the through hole 13L of the lower PCa column outer peripheral member 12L and supported by the lower PCa column outer peripheral member 12L. As shown in FIG. The upper PCa column outer peripheral member 12U is arranged on the lower PCa column outer peripheral member 12L so that the core member 11 enters the through hole 13U from below, and is supported by the PCa column core member 11. Accordingly, the weight of each of the lower PCa column outer peripheral member 12L and the upper PCa column outer peripheral member 12U constituting the column outer peripheral portion 1o of each floor can be reduced to facilitate handling, and the upper PCa column outer peripheral member 12U can be easily overturned. The construction work (placement work) of the column outer peripheral portion 1o is facilitated.

  Further, as shown in FIGS. 6A and 7F, at least the lower portion of the column core portion 1i is constructed so as to protrude upward from the upper surface of the column outer peripheral portion 1o, and FIGS. As shown in FIG. 7 (F), the lower PCa column outer peripheral member 12L is arranged and supported by the column core portion 1i so that the protruding column core portion 1i enters the through hole 13L from below. The PCa joint core member 10 is arranged on the upper PCa column outer peripheral member 12U so that the beam core end portion 10b is supported, and at least the lower portion of the column core portion 1i on the upper floor is constructed by the column core lower portion 10c. Yes. As a result, the beam core portion 2i and the column core portion 1i, both of which are made of high-strength concrete, can be connected, and the lower PCa column outer peripheral member 12L can be prevented from overturning to facilitate the construction work of the composite column 1 and shorten the construction period. Can do.

<< Second Embodiment >>
Next, a second embodiment of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the member and site | part which have the same function as the said embodiment, and the overlapping description is abbreviate | omitted. The same applies to the embodiments described below.

  In the present embodiment, the configuration of the upper PCa column outer peripheral member 12U is different from that of the first embodiment. That is, the upper PCa column outer peripheral member 12U of the present embodiment is arranged on the lower PCa column outer peripheral member 12L, and the upper end of the upper PCa column outer peripheral member 12U substantially coincides with the lower surface of the beam core portion 2i instead of the upper surface of the composite beam 2 (that is, , A height substantially matching the upper surface of the PCa column core member 11). Accordingly, the upper end of the upper PCa column outer peripheral member 12U is not formed with a notch 14 for arranging the beam core end portion 10b of the PCa joint core member 10 at the upper end, and the upper end surface is flat, and the PCa is formed thereon. The joint core member 10 is disposed.

  In the upper part of the upper PCa column outer peripheral member 12U which is shorter than the upper PCa column outer peripheral member 12U of the first embodiment, a formwork is assembled after the PCa composite beam member 20 is arranged around the PCa composite outer peripheral member 12U. When filling the concave portion 23 of the beam member 20 with the filler 5, the column outer peripheral portion 1o is constructed by filling the filler 5 at the same time. Other construction procedures are the same as those in the first embodiment.

  Even if the upper PCa column outer peripheral member 12U is formed in this way, the beam core end portion 10b disposed in the recessed portion 23 is supported by the PCa composite beam member 20, so that the PCa joint core can be used without taking any measures to prevent falling. The member 10 can be disposed above the PCa column core member 11.

«Third embodiment»
A third embodiment of the present invention will be described with reference to FIG. The present embodiment is different from the first embodiment in that the column outer peripheral portion 1o is constituted by a PCa column outer peripheral member 12 which is one PCa concrete member. That is, the PCa pillar outer peripheral member 12 has a height corresponding to the floor height of one layer. In the illustrated example, the PCa column outer peripheral member 12 is arranged on the lower-level composite column 1 and is supported by the column core portion 1i so that the upper end is a height that matches the upper surface of the composite beam 2. However, as in the second embodiment, the upper end may be a height that matches the lower surface of the beam core portion 2i.

  When the composite ramen structure 100 is constructed using such a PCa column outer peripheral member 12, the PCa column outer peripheral member 12 is replaced with a lower floor composite in place of the lower PCa column outer peripheral member 12L in the operation shown in FIG. By disposing on the pillar 1, the work shown in FIG. 6C can be omitted. That is, by performing the operation of inserting the PCa column core member 11 shown in FIG. 6B into the through hole 13 of the PCa column outer peripheral member 12, the composite column 1 for one layer is constructed. The subsequent construction procedure is the same as in the first embodiment.

  Thus, since the man-hour for constructing the column outer peripheral portion 1o is reduced by having the PCa column outer peripheral member 12 having a height corresponding to the floor height of one layer, the construction work of the composite column 1 is easier. become.

<< Fourth Embodiment >>
A fourth embodiment of the present invention will be described with reference to FIG. In the present embodiment, in addition to the use of the PCa column outer peripheral member 12 having a height corresponding to the floor height of one layer as in the third embodiment, the configuration of the PCa joint core member 10 is the above embodiment. Is different. That is, the PCa joint core member 10 of the present embodiment extends downward from the joint core 10a in addition to the joint core 10a, the beam core end 10b, and the column core lower part 10c, and the column core 1i on the lower floor. The upper part 10d of the column core constituting the upper third quarter is integrally formed of high-strength concrete. In other words, the PCa column core member 11 used in the above embodiment is integrally formed at the lower end of the PCa joint core member 10. In addition, although the upper part of the PCa pillar outer peripheral member 12 corresponds to the second embodiment (FIG. 8), the structure corresponds to the first embodiment (FIG. 2) and the third embodiment (FIG. 9). It may be.

  By constructing the composite ramen structure 100 using such a PCa column outer peripheral member 12 and the PCa joint core member 10, a column outer peripheral portion 1o for one layer is constructed by the operation shown in FIG. 6A. The work shown in FIG. 6C can be omitted, and the work shown in FIG. 6B can also be omitted. That is, in the operation shown in FIG. 7E, the upper portion of the column core portion 1i is constructed by the column core upper portion 10d by using the PCa joint core member 10 of the present embodiment. Thereby, the construction work of the composite ramen structure 100 is further facilitated.

«Fifth embodiment»
A fifth embodiment of the present invention will be described with reference to FIG. In the present embodiment, the PCa pillar outer peripheral member 12 (a through-hole having a height corresponding to one floor height and penetrating vertically is used in the third embodiment (FIG. 9) and the fourth embodiment (FIG. 10). 13 is formed), a PCa composite pillar member 30 is used. The PCa composite column member 30 constitutes a column core portion 1i made of high-strength concrete, and constitutes a column core main portion 31 having a height corresponding to the upper part of one floor and a column outer peripheral portion 1o made of ordinary concrete. This is a PCa concrete member integrally formed with a column outer periphery main portion 32 having a height corresponding to one floor height. In other words, the PCa column core member 11 used in the first to third embodiments is integrally formed with the PCa column outer peripheral member 12 used in the third embodiment (FIG. 9). Accordingly, the through hole 13 is not formed in the PCa composite column member 30, and a bottomed hole 33 that opens only downward is formed inside the column cross section, and the bottomed hole 33 has the bottom of the composite column 1 on the lower floor. The lower part of the column core part 1i protruding from the upper surface (the column core lower part 10c of the PCa joint core member 10) enters.

  By constructing the composite ramen structure 100 using such a PCa composite pillar member 30, in addition to the work shown in FIG. 6C omitted in the third embodiment, the work shown in FIG. 6B is also omitted. can do. That is, in the operation shown in FIG. 6A, the entire composite pillar 1 for one layer is constructed by using the PCa composite pillar member 30 of the present embodiment. Thereby, the construction work of the composite pillar 1 is further facilitated.

<< Sixth Embodiment >>
A sixth embodiment of the present invention will be described with reference to FIG. In the present embodiment, in addition to the PCa pillar outer peripheral member 12 having a height corresponding to the floor height of one layer as in the third embodiment (FIG. 9) and the fourth embodiment (FIG. 10), The configuration of the PCa joint core member 10 is different from that of the fourth embodiment (FIG. 10). That is, the PCa joint core member 10 of the present embodiment does not include the column core upper portion 10d extending downward as in the fourth embodiment, but the column core lower portion 10c is a lower portion of the one-level column core portion 1i. It has a height that constitutes not only the upper part. In other words, the PCa column core member 11 used in the first to third embodiments is integrally formed on the upper end of the PCa joint core member 10 used in these embodiments.

  By constructing the composite ramen structure 100 using such a PCa column outer peripheral member 12 and the PCa joint core member 10, the work shown in FIG. 6C is omitted and the work shown in FIG. 6B is performed. Can also be omitted. That is, by using the PCa joint core member 10 of the present embodiment in the operation shown in FIG. 7E, the entire column core part 1i is constructed by the joint core part 10a and the column core lower part 10c. Thereby, the construction work of the composite ramen structure 100 is further facilitated.

<< Seventh Embodiment >>
Finally, a seventh embodiment of the present invention will be described with reference to FIG. In this embodiment, the column outer peripheral portion 1o is constructed by the cast-in-place concrete 40 instead of configuring the column outer peripheral portion 1o by the arrangement of the PCa column outer peripheral member 12 used in the third embodiment (FIG. 9). The construction work of the composite ramen structure 100 is as follows.

  That is, the PCa column core member 11 prepared in advance as a PCa concrete member is disposed on the lower part of the column core portion 1i protruding from the upper surface of the composite column 1 or the foundation on the predetermined floor (column core lower portion 10c), Both are joined using the joint hardware 19. Thereafter, the reinforcing bars for the composite column 1 such as the column main reinforcing bars 16 and the belt reinforcing bars 17 are assembled, and the supporting work 6 (not shown) is assembled around and the PCa composite beam member 20 is arranged at a predetermined position. Thereafter, the column mold 41 is assembled around the column core portion 1i, and the PCa joint core member 10 is disposed at a predetermined position. Finally, ordinary concrete is placed in the column form 41 and is driven up to the upper surface of the PCa composite beam member 20 to construct a composite ramen structure 100 for one layer.

  In the illustrated example, the PCa joint core member 10 has the same configuration as that of the first embodiment or the like. However, as in the sixth embodiment (FIG. 12), the entire column core portion 1i of one layer is configured. The PCa joint core member 10 may be used.

  Even if the composite rigid frame structure 100 is constructed in this way, the beam core portion 2i and the column core portion 1i both made of high-strength concrete can be connected, and the PCa composite beam member 20 in which almost the entire composite beam 2 is made into PCa is used. Therefore, the construction can be facilitated and the construction period can be shortened.

  This is the end of the description of the specific embodiments, but the present invention is not limited to these embodiments, and the specific shape, arrangement, quantity, angle, and work content and sequence of construction procedures of each element. These can be changed as appropriate without departing from the spirit of the present invention. For example, in the above-described embodiment, the middle column to which the composite beam 2 is connected in all directions has been shown as an example, but the present invention can naturally be applied to corner columns and outer peripheral columns. Further, in the above embodiment, the floor slab has not been described. However, when the slab is coupled to the side surface of the composite beam 2, even if the concrete on the upper part of the beam outer peripheral main portion 22 is not placed. Good. In this case, the entire beam core main portion 21 and at least the lower portion of the beam outer peripheral main portion 22 are formed of PCa concrete to form a PCa composite beam member 20, and the PCa composite beam member 20 is disposed on the site and the column core portion 1i made of PCa concrete is formed. After constructing at least the upper surface of the slab, the upper portion of the beam outer peripheral main portion 22 may be constructed simultaneously with the floor slab by using cast-in-place concrete. In addition, the composite ramen structure 100 and each element in the construction direction shown in the above embodiment are not necessarily all necessary, can be appropriately selected, and can be combined between the embodiments.

DESCRIPTION OF SYMBOLS 1 Composite pillar 1i Column core part 1o Column outer peripheral part 2 Composite beam 2i Beam core part 2o Beam outer peripheral part 10 PCa joint core member 10a Joint core part 10b Beam core end part 10c Column core lower part 10d Column core upper part 11 PCa column core member 12 PCa pillar Peripheral member (PCa pillar member)
12L Lower PCa column outer peripheral member (PCa column member)
12U Upper PCa column outer peripheral member (PCa column member)
13, 13L, 13U Through-hole 20 PCa composite beam member 21 Beam core main part 22 Beam outer peripheral main part 23 Recessed part 30 PCa composite column member (PCa column member)
31 Column core main part 32 Column outer periphery main part 33 Bottomed hole 40 Cast-in-place concrete 100 Composite ramen structure

Claims (5)

Each of the column core and the beam core has a column and a beam that are rigidly connected to each other, and the column core and the beam core disposed inside the member cross section are made of high-strength concrete having a predetermined water bonding material ratio and strength. The outer peripheral part of the column and the outer peripheral part of the beam arranged at the outer peripheral part of the member cross section so as to cover the outer peripheral surface of the member are made of concrete having a higher water binding material ratio and lower strength than the high-strength concrete, and the beam core part is the column core A method for constructing a composite ramen structure connected to a part,
In a predetermined floor, the column core portion formed of the PCa concrete member is positioned immediately below the joint core portion that forms the connection portion between the column core portion and the beam core portion, and at least the upper end of the column outer peripheral portion is at least Constructing at least the upper part of the column to reach a position corresponding to the lower surface of the beam core;
The beam core is formed shorter than the outer periphery of the beam so as to form a recess that opens laterally at both ends in the axial direction, and the outer periphery of the beam is notched so that the recess opens also on the upper surface. Providing a PCa composite beam member;
Arranging the PCa composite beam member around the pillar in the predetermined floor;
At least the joint core, a beam core end extending sideways from the joint core, and a column core extending upward from the joint core and constituting at least the lower part of the column core on the upper floor Preparing a PCa joint core member integrally formed with the lower part;
In the predetermined floor, the PCa joint core member is housed and supported in the recessed portion of the PCa composite beam member disposed around the column, at the beam core end portion of the PCa joint core member. Placing on the pillar;
Constructing the column outer peripheral portion on the upper floor to cover at least the lower portion of the column on the upper floor so as to cover the outer peripheral surface of the lower portion of the column core of the arranged PCa joint core member. The construction method of the composite ramen structure characterized by this. Building at least the lower part of the pillar,
Providing a PCa column member in which a hole opening at least downward is formed inside the column cross section, and constituting at least a lower portion of the column outer peripheral portion;
The step of arranging the PCa column member on the PCa connection core member and supporting the PCa connection core member on the lower portion of the column core so that the lower portion of the column core of the arranged PCa connection core member enters the hole from below. The method for constructing a composite ramen structure according to claim 1, wherein: The column outer peripheral portion of the PCa column member has a height corresponding to a half-level floor height,
Building at least the top of the pillar comprises:
Preparing a PCa column core member constituting the upper portion of the column core portion not including the joint core portion;
A step of preparing an upper PCa column member in which a through-hole penetrating the inside in the column cross-section is formed and constituting at least an upper portion of the column outer peripheral portion;
Inserting a PCa column core member into the hole formed so as to open on the upper surface of the PCa column member supported by the column core lower part, and supporting the PCa column member on the PCa column member;
The step of arranging the upper PCa column member on the PCa column member and supporting the PCa column core member so that the PCa column core member supported by the PCa column member enters the through hole from below. The method for constructing a composite ramen structure according to claim 2, wherein: The column outer peripheral portion of the PCa column member has a height corresponding to a floor height of one level,
The method of building a composite ramen structure according to claim 2, wherein the step of building at least the lower part of the column and the step of building at least the upper part of the column are performed as the same step. Each of the column core and the beam core has a column and a beam that are rigidly connected to each other, and the column core and the beam core disposed inside the member cross section are made of high-strength concrete having a predetermined water bonding material ratio and strength. The outer peripheral part of the column and the outer peripheral part of the beam arranged at the outer peripheral part of the member cross section so as to cover the outer peripheral surface of the member are made of concrete having a higher water binding material ratio and lower strength than the high-strength concrete, and the beam core part is the column core A method for constructing a composite ramen structure connected to a part,
Constructing at least a lower portion of the column core portion so as to protrude upward from an upper surface of the column outer peripheral portion in a predetermined floor;
Providing a PCa column member in which a hole opening at least downward is formed inside the column cross section, and constituting at least a lower portion of the column outer peripheral portion;
Placing the PCa column member on the predetermined floor and supporting the column core portion on the predetermined floor so that the column core portion constructed to protrude upward enters the hole from below;
At least a connection core portion that forms a connection between the column core portion and the beam core portion, a beam core end portion that extends laterally from the connection core portion, and an upper floor that extends upward from the connection core portion. Preparing a PCa joint core member integrally formed with a column core lower part constituting at least a lower part of the column core part in
The PCa connection core member is disposed on the PCa column core member disposed on the predetermined floor so that the beam core end portion is supported, and the PCa connection core member is disposed on the upper side by the lower portion of the column core. And a step of constructing at least a lower part of the column core part on the floor.

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