JP7158997B2 - Joining structure and joining method of precast concrete members - Google Patents

Description

TECHNICAL FIELD The present invention relates to a joining structure and joining method of precast concrete members in the construction of a building using precast concrete members, and more particularly, joining of precast concrete members by placing cast-in-place concrete at joints between precast concrete beam members. It relates to a structure and a joining method.

BACKGROUND ART In reinforced concrete structures, various precast concrete members (hereinafter referred to as precast members) manufactured in factories in advance are often used for rationalization of construction and shortening of construction period. At this time, when the beams are made of precast members, beam joints may be provided for joining the precast members with division positions such as the center or the end of the span of the beams. In order to join the main reinforcing bars of the beams at this dividing position, generally a 600 to 800 mm on-site concrete placement portion is provided at the beam joints for welding work or mechanical joint work. For this reason, at the beam joint, it takes a lot of time and labor for positioning and the like in welding work and mechanical joint work, and it cannot be said that work efficiency is good.

In order to address these problems, Patent Literature 1 discloses a method of joining precast reinforced concrete using a beam sleeve at a column-to-beam joint.

JP 2006-225897 A

However, in the joining method described in Patent Document 1, as described in FIG. 9 of Patent Document 1, the order of constructing the beams, etc. must follow a certain rule, so the degree of freedom in construction is low. In addition, there is a problem that it is not possible to shorten the construction period or save manpower in constructing each beam.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a joining structure and a joining method for precast members that are capable of shortening the construction period and saving manpower and having a high degree of freedom in construction.

In order to achieve the above object, the present invention provides a precast concrete column having upper connecting bars and lower connecting bars extending laterally, and a first joint reinforcing bar, a first upper connecting bar, and a first connecting bar from one beam section. A first precast concrete beam member having a first bottom reinforcement overhanging and a joint part on the other beam cross section, and a second joint reinforcing reinforcement, a second top reinforcement and a second bottom reinforcement extending from the beam cross section. and a second precast concrete beam member, wherein a column-to-beam joint between the precast concrete column and the first precast concrete beam member is constructed by the upper end connecting bar and the lower end connecting bar at the joint. , a first perforated lap joint formed by the first joint reinforcement and the second joint reinforcement, and a second perforated lap joint formed by the first top reinforcement and the second top reinforcement. constructing a beam joint between the first precast concrete beam member and the second precast concrete beam member having a third lap joint with the first bottom reinforcement and the second bottom reinforcement; The concrete of the beam joint portion has the same strength as the concrete of the floor slab partly formed integrally with the beam joint portion, and is lower in strength than the concrete strength of the first and second precast concrete beam members. is characterized by being cast-in-place concrete.

The first joint reinforcing bar and the second joint reinforcing bar are preferably oblique reinforcing bars.

As a joining method, the present invention includes a first precast concrete beam member in which a first joint reinforcing bar , a first upper end bar and a first lower end bar protrude from one beam cross section, and a second precast concrete beam member from the beam cross section. A second precast concrete beam member overhanging a joint reinforcing bar , a second top bar and a second bottom bar, wherein the first joint reinforcing bar and the second joint reinforcing bar are first said first top bar and said second top bar forming a second gap lap joint, said first bottom bar and said second bottom bar forming a third constructing a beam joint by joining the first precast concrete beam member and the second precast concrete beam member to form a spaced lap joint; A joint is formed by an upper end connecting bar and a lower end connecting bar protruding from the side of a precast concrete column at a joint provided in a beam cross section, and the beam joint and a part thereof are integrally formed with the beam joint. and concrete having the same strength and lower strength than the concrete strength of the first and second precast concrete beam members.

According to the present invention, construction period can be shortened and manpower can be saved, and the degree of freedom in construction can be increased.

(a) is a front cross-sectional view of a joint structure for precast members according to an embodiment of the present invention, (b) is a side cross-sectional view taken along the Ib-Ib cross-sectional line in (a), (c) is a ) is a side cross-sectional view taken along the Ic-Ic cross-sectional line of FIG. (a) is a front cross-sectional view of a precast member for general parts according to an embodiment of the present invention, (b) is a side cross-section shown by the IIb-IIb cross-sectional line of (a), (c) and (d) Figure, (c) is a front cross-sectional view of the precast member for the terminal portion according to the embodiment of the present invention, and (d) is a precast member arranged in a direction intersecting the precast member according to the embodiment of the present invention. Front sectional view. BRIEF DESCRIPTION OF THE DRAWINGS The schematic beam laying down figure which showed partially the beam structure comprised with the precast member which concerns on embodiment of this invention. (a) is a front cross-sectional view when one beam member is arranged in the first span (and second span) of the method for joining precast members according to the embodiment of the present invention, and (b) is the other beam member. Front cross-sectional view at the time of arrangement, (c) is a front cross-sectional view at the time of arrangement of the stirrups and upper end muscles. (a) is a front sectional view when one beam member is arranged in the final span of the method for joining precast members according to the embodiment of the present invention; (b) is a front sectional view when the other beam member is arranged; (c) is a cross-sectional front view after placing concrete in the beam joint and the floor slab after placing the stirrup and top reinforcement.

The joining structure and joining method of precast members according to the present invention will be described below with reference to the accompanying drawings. In addition, the same components are given the same reference numerals, and the description thereof is omitted.

[Structure of joint]
A precast concrete beam member 1 (hereinafter referred to as beam member 1) as an embodiment of the present invention shown in FIGS. It is a precast member that uses cast-in-place concrete for the portion corresponding to the thickness of the floor slab. As shown in FIG. 3, this precast member joint structure J1 includes beam members 1A having a beam end joint 10 at one end in the beam longitudinal direction (or the beam member 1A and the last beam member to be described later). 1B) are joined (beam joint 5), and the beam member 1A (or beam member 1B) and the beam member 2A (or beam member 2B) arranged on the column are joined (column side joint 6). Consists of structure. As shown in each figure of FIG. Simultaneously with the installation, the cast-in-place concrete 13 having the same strength as the floor slab concrete 41 is placed to integrally form the floor slab concrete. As shown in FIGS. 3 and 4 as an example, the shape of these beam end joints 10, 10 is such that the beam members 1A, 1B are continuously constructed between the column members P1, P2, and the beam span is increased. It is assumed that they are joined in a central position. The column side joints 6 are connected to joints 19 and 20 provided at the beam end joints 30 at the other ends of the beams in the longitudinal direction. are connected to form a joint.

<Structure of beam joint>
Hereinafter, configurations of the beam member 1A and the beam member 1B will be described with reference to FIGS. The beam member 1A and the beam member 1B are factory-manufactured precast members, and beam end joints 10 and 30 are provided at the beam ends.

(Configuration of beam member 1A)
As shown in FIGS. 2A, 3 and 4, the beam member 1A has a beam end joint 10 at one end in the beam longitudinal direction and a beam end joint 30 at the other end. The beam member 1A is constructed between the column members P1 and P2 (or between the column members P2 and P2). From the end surface 14 of the beam cross section of the beam end joint 10, oblique reinforcements 15 and 16, an upper end reinforcement 17 and a lower end reinforcement 18 are arranged so as to protrude in the beam longitudinal direction. Joint portions 19 and 20 are provided on the end face of the beam end joint portion 30 . This end face is constructed so as to be flush with the end face provided with upper end through holes 28 and lower end through holes 29 of a column member P1 (P2), which will be described later.

As shown in FIGS. 2(a) and 2(b), in this embodiment, two oblique reinforcing bars 15 are arranged horizontally in the longitudinal direction of the beam on the upper part of the beam near the upper end bar 17, and the end face 14 of the cross section of the beam 45° obliquely downward. The overhang length of the oblique reinforcing bars (diameter d1) 15 is ensured to be 30×d1.

The oblique reinforcing bars 16 protrude obliquely upward at about 45° from the vicinity of the end face 14 of the cross section of the beam. The overhang length of the oblique reinforcing bars (diameter d2) 16 is ensured to be 30×d2.

The upper end reinforcement 17 extends horizontally from the end surface 14 of the cross section of the beam, and has a right angle hook shape with the tip directed downward. The overhang length of the top reinforcement 17 (diameter d3) is 40×d3 including the tip of the hook.

The bottom reinforcement 18 extends horizontally from the end surface 14 of the cross section of the beam, and has a right-angled hook shape with its tip directed upward. The overhang length of the bottom reinforcement 18 (diameter d4) is 40×d4 including the tip of the hook.

The joint portions 19 and 20 are configured by mechanical joints in this embodiment. Top reinforcements 17 and bottom reinforcements 18 are arranged at the beam inner ends of the joints 19 and 20 . The upper end connecting bar 26 (51) and the lower end connecting bar 27 (52) of the beam member 2A (2B) are arranged at the beam outer ends of the joint portions 19 and 20, and the upper end bar 17 and the upper end are connected by this mechanical joint. The muscle 26 (51), the bottom muscle 18 and the bottom connecting muscle 27 (52) are integrally joined.

(Configuration of beam member 1B)
As shown in FIGS. 2(c), 3 and 4, the beam member 1B is the last beam to be erected in the span from the central pillar P2 to the outer pillar P1. The diagonal reinforcing bars 15a and 16a of the beam member 1B have different overhang angles from the diagonal reinforcing bars 15a and 16a of the beam member 1A. Further, the length of the beam member 1B in the beam longitudinal direction is set shorter than the length of the beam member 1A in the beam longitudinal direction by considering the projection length F1 of the upper end connecting bar 26 and the lower end connecting bar 27.

As shown in FIGS. 2(b) and 2(c), in the present embodiment, the diagonal reinforcing bars 15a protrude obliquely downward at an angle of about 28 degrees from the vicinity of the end face 14 of the cross section of the beam. The overhang length of the oblique reinforcement (diameter d5) 15a is ensured to be 30×d5.

The oblique reinforcing bars 16a protrude obliquely upward by about 28° from the vicinity of the end face 14 of the cross section of the beam. The overhang length of the oblique reinforcement (diameter d6) 16a is ensured to be 30×d6.

(Configuration of beam member 2A)
As shown in FIGS. 2(d), 3 and 4, the beam member 2A has a beam end joint 10 at one end in the beam longitudinal direction. The beam members 1A and 1B are placed on a column member P1, which is an outer column facing the outer periphery (or a central column facing an internal atrium space where no beam extends over the span beyond the column). It is erected in a crossing direction.

A columnar portion 25 having the same cross section as that of the column member P1 is formed at one end of the beam member 2A in the beam longitudinal direction. A column main-reinforcement through-hole 22 for inserting the column main-reinforcement 23 of the column member P1 is formed in the column-shaped portion 25 . In addition, as shown in FIGS. 1(a) and 2(d), the pillar portion 25 is provided with upper connecting bars 26 and lower connecting bars 27 protruding from one side in the beam width direction (inside the building). is laid out in

(Configuration of beam member 2B)
As shown in FIGS. 2(e), 3 and 4, the beam member 2B has beam end joints 10 at both ends in the beam longitudinal direction. Oblique reinforcing bars 15 and 16, an upper bar 17 and a lower bar 18 are arranged so as to protrude in the longitudinal direction of the beam from end surfaces 14 of beam cross-sections at both ends of the beam end joint 10 . The beam member 2B is constructed on the pillar member P2 as a middle pillar so that the pillar main reinforcement 23 penetrates the inside.

A columnar portion 25 having the same cross section as that of the column member P2 is formed in the middle of the beam member 2B in the beam longitudinal direction. The column portion 25 is formed with a column main-reinforcement through-hole 22 for inserting the column main-reinforcement 23 of the column member P2. In addition, upper end through holes 28 and lower end through holes 29 for inserting upper end through-reinforcements 51 and lower end through-reinforcements 52 are formed in the columnar portion 25 in the beam width direction. Other configurations are the same as those of the beam member 1A.

(Other configurations)
As shown in FIGS. 1( a ) and 1 ( b ), the stirrup reinforcement 11 is arranged so as to surround the oblique reinforcements 15 and 16 , the top reinforcement 17 and the bottom reinforcement 18 .

<Composition 1 of joining structure>
A joint structure J1 of precast concrete beam members (precast beam members) will be described with reference to FIGS. In the joint structure J1 of the precast beam members, the beam joint portion 5 includes the beam end joint portions 10, 10 of the beam members 1A (2A, 2B: abbreviated below) and 1A (2B, 2B: abbreviated below) at a predetermined interval D1. are opposed to each other with a space between them. Between the beam members 1A, 1A, the oblique reinforcing bars 15 (16) of one beam member 1A and the oblique reinforcing bars 16 (15) of the other beam member 1A, which face each other, form lapped joints to absorb the shear force. It functions as a transmitting member. Further, the top reinforcements 17, 17 of the beam members 1A, 1A form an open lap joint and function as top reinforcements of the beams between the column members P, P. The bottom reinforcements 18, 18 of the beam members 1A, 1A form an open lap joint and function as bottom reinforcements of the beams between the column members P, P. In addition, the opening dimension S is 0.2 LE and 150 mm or less at each opening lap joint portion, and opening lap joint length LE=30×reinforcement diameter. Between the end faces 14, 14 of the beam cross section of the beam members 1A, 1A, there is a cast-in-place concrete 13 which is integral with the floor slab 40, has the same strength as the floor slab concrete, and has a lower strength than the concrete strength of the beam member 1A. is cast. The reinforcing bars forming the lapped joint are shifted in the beam width direction so that they do not interfere when the beam member is lowered, as indicated by the symbols ○ and X in Fig. 1(b). It is

In the joint structure J1 of the precast beam member, the column side joint portion 6 is arranged so that the beam end joint portion 10 of the beam member 1A and one surface of the column portion 25 of the beam member 2A in the beam width direction are opposed to each other. configured as follows. The upper connecting bar 26 of the beam member 2A (or the upper penetrating bar 51 of the beam member 2B) is fitted with the joint portion 19 of the beam member 1A, and the lower connecting bar 27 of the beam member 2A (or the lower penetrating bar of the beam member 2B) is fitted. 52) is fitted to the joint portion 20 of the beam member 1A and filled with grout material to form a mechanical joint, thereby forming the column side joint portion 6. As shown in FIG.

Generally, in precast concrete construction, since the cast-in-place concrete for beam joints requires greater strength than the floor slab concrete, it is not possible to cast concrete at the same time. However, in the present invention, there are joint reinforcements composed of the diagonal reinforcements 15 of the beam member 1A and the diagonal reinforcements 16 of the other beam member 1A, and the diagonal reinforcements 16 of the beam member 1A and the diagonal reinforcements of the other beam member 1A. 15 transmits part of the shear force at the beam joint, so that the required strength of the cast-in-place concrete 13 between the end faces 14, 14 of the design beam cross section of the beam members 1A, 1A is determined by the beam member 1A , 1A, the same strength as the floor slab concrete having lower strength than the beam members 1A, 1A. Therefore, the cast-in-place concrete 13 can be poured simultaneously and integrally between the end faces 14, 14 of the design cross section of the beam members 1A, 1A and part of the floor slab 40 directly above the beam members 1A, 1A. Further, since the tip portions of the upper end reinforcement 17 and the lower end reinforcement 18 are formed in a right angle hook shape, the predetermined distance D1 between the end faces 14, 14 of the design beam cross section of the beam members 1A, 1A can be shortened, and the cast-in-place concrete 13 can reduce the amount of installation. Furthermore, since the beam side joint 6 is a mechanical joint, it does not require cast-in-place concrete.

<Composition 2 of joining structure>
A joint structure J2 of precast concrete beam members (precast beam members) will be described with reference to FIGS. A joint structure J2 of precast beam members is formed in the column span where the beam members are placed last. In the joint structure J2 of the precast beam member, the beam joint portion 5a is constructed by facing the beam end joint portions 10, 10 of the beam members 1A-5, 1B with a predetermined interval D1+F1. Between the beam members 1A-5 and 1B, the oblique reinforcing bars 15a (16a) of the beam member 1A-5 and the oblique reinforcing bars 16a (15a) of the beam member 1B form a lap joint to transmit shear force. function as Between the end faces 14, 14 of the beam cross-section of the beam members 1A-5, 1B, it is integrated with the floor slab 40, has the same strength as the floor slab concrete, and has a lower strength than the concrete strength of the beam members 1A-5, 1B. of cast-in-place concrete 13 is placed.

<Joining method of precast beam members>
Next, a method for joining the beam member 1A, the beam member 1B, the beam member 2A, and the beam member 2B will be described with reference to FIGS. First, in the first span, as shown in FIG. 4A, the beam member 1A-1 is joined to the beam member 2A-1 placed on the column member P1, which is the outer column, and joined integrally. The beam member 1A-1 is hung almost vertically toward the joint position, the upper end connecting bar 26 of the beam member 2A-1 is fitted into the joint portion 19 of the beam member 1A-1, and the lower end of the beam member 2A-1 is fitted. After fitting the connection bar 27 to the joint portion 20 of the beam member 1A-1, the joint portions 19 and 20 are filled with a grout material to form a joint. At this time, the beam member 1A-1 is supported by the pipe support 50 as shown in FIG. 4(b).

Subsequently, the beam member 1A-2 is joined to the beam member 2B-1 arranged on the column member P2, which is the middle pillar, and at the same time, the beam joint portion 5 is formed by the beam member 1A-1 and the beam member 1A-2. do. At this time, the diagonal reinforcing bar 15 (16) of the beam member 1A-1 and the diagonal reinforcing bar 16 (15) of the beam member 1A-2 form a lapped joint, and the upper end bar 17 (15) of the beam member 1A-1 ( The beam end joints 10, 10 are opposed to each other so that the bottom reinforcement 18) and the top reinforcement 17 (bottom reinforcement 18) of the beam member 1A-2 form an open lap joint, and are hung at the beam joint position. , the beam member 1A-2 is also supported by the pipe support 50. As shown in FIG.

Prior to the pouring operation of the cast-in-place concrete 13, as shown in FIG. The penetrating muscle 51 is inserted, and the lower end penetrating muscle 52 is inserted into the lower end through hole 29 . Also, stirrup bars 11 are arranged between the beam members 1A-1 and 1A-2. At the same time, the reinforcement of the floor slab (not shown) is also arranged. After that, in order to complete the design concrete cross section, at the floor slab portion between the beam members 1A-1 and 1A-2 and above the beam members 1A-1 and 1A-2, at the same time, with the same strength as the floor slab concrete, and Cast-in-place concrete 13 having a lower strength than the concrete strength of the beam members 1A-1 and 1A-2 is placed to form a joint structure J1 of precast members.

Next, as shown by replacing the column member P1 in FIG. 4(a) with the column member P2 after the upper end penetrating bar 51 and the lower end penetrating bar 52 are inserted in FIG. In the second span, the beam member 1A-3 is joined to the beam member 2B-1 placed on the column member P2. The beam member 1A-3 is hung almost vertically toward the joining position, and then horizontally moved toward the beam member 2B-1, and the upper end penetrating bar 51 as the upper end connecting bar of the beam member 2B-1 is attached to the beam member 1A. -3, and the lower end through bar 27 as the lower end connecting bar of the beam member 2B-1 is fitted to the joint part 20 of the beam member 1A-3. After that, the joints 19 and 20 are filled with a grout material to form joints.

Subsequently, as shown by replacing the column member P1 in FIG. 4B with the column member P2 after the upper end penetrating bar 51 and the lower end penetrating bar 52 are inserted in FIG. The beam member 1A-4 is joined to the beam member 2B-2 placed on P3, and at the same time, the beam joint portion 5 is formed by the beam member 1A-3 and the beam member 1A-4. In this case also, a predetermined gap lap joint can be formed at each part.

Also, in the beam members 1A-3 and 1A-4, a joint structure J1 of precast members is formed through the same process.

Next, as shown in FIG. 5(a), the beam member 1A-3 is joined to the beam member 2B-1 placed on the column member P2 in the third span, which is the final span adjacent to the second span. The beam member 1A-5 is joined to the beam member 2B-2 arranged on the column member P2 by the same step as the step (paragraph 0036).

Subsequently, as shown in FIG. 5(b), the beam member 1B is joined to the beam member 2A-2 arranged on the column member P4 which is the outer column, and at the same time, the beam member 1A-5 and the beam member 1B are joined together. A beam joint 5a is formed. At this time, it is preferable to horizontally move (laterally pull) the suspended beam member 1B to a predetermined position using an air cylinder or the like.

Through similar steps, as shown in FIG. 5(c), a joint structure J2 of precast members is formed at the same time as the construction of the floor slab.

The joint structure J2 of the precast member is usually formed on the outer pillar on which the beam member is installed at the end, but the joint structure J2 may also be formed on the span of only the central pillar. If the joint structure J2 is formed in the span of only the center pillar, the beam members of this span can be arranged later. As a result, the degree of freedom in erecting the beam member can be increased.

[Modification]
In the above-described embodiment, the stigma portion is fitted in a beam beam (a structure in which a precast concrete pillar body is formed by a pillar member and a beam member placed on the pillar member), but the stigma portion is A pillar winch arrangement (a structure in which a precast concrete column body is formed only by the column member) may be used, and upper end joint reinforcement, lower end joint reinforcement, or upper end through-holes and lower end through-holes may be arranged in the upper part of the column member. This eliminates the need to use the beam members 2A and 2B, which contributes to cost reduction by mass-manufacturing a small number of types of beam members. It also leads to labor saving.

The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of each claim. That is, embodiments obtained by combining technical means appropriately modified within the scope of the claims are also included in the technical scope of the present invention.

1, 1A, 1B, 2A, 2B (Precast concrete) Beam member 6 Column side joints 10, 30 Beam end joints 11 Stirrup bar 13 Cast-in-place concrete 14 End faces 15, 16 Diagonal reinforcing bar 17 Top bar 18 Bottom bar 19 , 20 joint part 21 stirrup bar 22 column main bar through hole 23 column main bar 24 frame top end 25 column type part 31 side surface 32, 33 side diagonal reinforcing bar 34 side lower end bar J1, J2 joint structure P1, P4 column member ( outer pillar)
P2, P3 Pillar member (middle pillar)

Claims (8)

A precast concrete column body in which the upper end connecting bar and the lower end connecting bar protrude laterally;
a first precast concrete beam member having a first joint reinforcing bar, a first top bar, and a first bottom bar projecting from one beam cross section, and having a joint portion on the other beam cross section;
a second precast concrete beam member in which the second joint reinforcing bar, the second top bar and the second bottom bar project from the cross section of the beam;
with
A column-to-beam joint between the precast concrete column body and the first precast concrete beam member is constructed by the upper end connecting bar and the lower end connecting bar at the joint,
a first perforated lap joint formed by the first joint reinforcement and the second joint reinforcement, and a second perforated lap joint formed by the first top reinforcement and the second top reinforcement; constructing a beam joint between the first precast concrete beam member and the second precast concrete beam member having a third lap joint with the first bottom reinforcement and the second bottom reinforcement;
The concrete of the beam joint portion has the same strength as the concrete of the floor slab partly formed integrally with the beam joint portion, and is lower in strength than the concrete strength of the first and second precast concrete beam members. A joint structure of precast concrete members, characterized in that the concrete is cast-in-place. The joint structure of precast concrete members according to claim 1, wherein the first joint reinforcing bar and the second joint reinforcing bar are oblique reinforcing bars. The second precast concrete beam member has another joint part on the beam cross section on the side opposite to the beam cross section where the second joint reinforcing bar protrudes,
A joint is formed by the upper end connecting bar and the lower end connecting bar protruding from the other precast concrete column at the other joint portion,
The joint structure of precast concrete members according to claim 1 or 2, wherein the beam length of the second precast concrete beam member is shorter than the beam length of the first precast concrete beam member. The precast concrete column is a precast concrete column member, or is composed of a precast concrete column member and a part of a precast concrete beam member placed on the precast concrete column member. The joint structure of precast concrete members according to any one of claims 1 to 3. The precast concrete beam member according to any one of claims 1 to 4, wherein the first and second top reinforcements and the first and second bottom reinforcements have hook-shaped tips. junction structure. A first precast concrete beam member protruding from one beam section with a first joint reinforcing bar , a first upper end bar and a first lower end bar, and a second joint reinforcing bar from a beam cross section , a second a second precast concrete beam member from which the top reinforcement and the second bottom reinforcement are overhanging, the first joint reinforcement and the second junction reinforcement forming a first gap lap joint; The first top muscle and the second top muscle form a second lap joint, and the first bottom muscle and the second bottom muscle form a third lap joint. constructing a beam joint by joining the first precast concrete beam member and the second precast concrete beam member;
forming a joint by an upper end connecting bar and a lower end connecting bar protruding from the side of the precast concrete column at a joint portion provided in the other beam cross section of the first precast concrete beam member;
The beam joint and the floor slab part of which is integrally formed with the beam joint have the same strength and are lower in strength than the concrete strength of the first and second precast concrete beam members. A method for joining precast concrete members, comprising placing concrete. The second precast concrete beam member has an upper end connection overhanging from another precast concrete column to another joint portion provided in the beam cross section on the side opposite to the beam cross section from which the second joint reinforcing bar overhangs. 7. The precast concrete according to claim 6, wherein a joint is formed by a bar and a bottom connecting bar, and the beam length of the second precast concrete beam member is shorter than the beam length of the first precast concrete beam member. Method of joining parts. The second joint reinforcing bar of the second precast concrete beam member overhangs the beam cross section, and another joint provided in the beam cross section on the opposite side faces the other precast concrete column. After that, the upper end through-reinforcement and the lower end through-reinforcement are inserted into the insertion holes formed in the other precast concrete column, and the ends of the upper end through-reinforcement and the lower end through-reinforcement protrude from the other precast concrete column. 7. The method for joining precast concrete members according to claim 6, wherein the other joint portion and the other column-to-beam joint portion are constructed.

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