JP2020063635A - Junction structure and junction method for precast concrete member - Google Patents

Abstract

To attain improvement in workability when casting cast-in-place concrete in a joint portion between precast concrete beam members.SOLUTION: A junction structure comprises: a precast pole P in which an upper end connection bar 26 and a lower end connection bar 27 are expanded laterally; a precast beam member 1A in which joint part reinforcement bars 15 and 16, an upper end bar 17 and a lower end bar 18 are expanded from one beam cross section and which includes a splice part on the other beam cross section; and a precast beam member 2A in which the joint part reinforcement bars 15 and 16, the upper end bar 17 and the lower end bar 18 are expanded from a beam cross section. A pole-beam joint part of the precast pole P and the precast beam member 2A is constructed by the upper end connection bar 26 and the lower end connection bar 27 in the splice part. A beam joint part of the precast beam member 1A and the precast beam member 2A is constructed by non-contact lap splices mutually constituted of the joint part reinforcement bars 15 and 16, the upper end bars 17 and the lower end bars 18. Concrete of the beam joint part is casted on a job site, a concrete strength is equal to that of a floor slab which is formed integrally with the beam joint part, and lower than that of the precast beam member.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a joining structure and a joining method of precast concrete members in the construction of a building using precast concrete members, and in particular, joining of precast concrete members for placing cast-in-place concrete in the joint portion between precast concrete beam members. It relates to a structure and a joining method.

  In reinforced concrete structures, various precast concrete members (hereinafter referred to as precast members) that have been factory-manufactured in advance are often used in order to rationalize construction and shorten the construction period. At this time, when the beam is made of a precast member, a beam joint portion for joining the precast members with the center or end of the beam span as a dividing position may be provided. In order to join the main bars of the beam at the divided positions, it is common to provide an on-site concrete placing portion of about 600 to 800 mm at the beam joining portion for welding work or mechanical joint work. For this reason, at the beam joint, it takes time and effort for alignment 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 Document 1 discloses a method for joining precast reinforced concrete that uses a beam sleeve at a beam-column joint.

JP, 2006-225897, A

  However, in the joining method described in Patent Document 1, as shown in FIG. 9 of Patent Document 1, the installation order of the beams and the like need to follow certain rules, so that the degree of freedom in construction is low. In addition, there is a problem that the construction period cannot be shortened and labor saving cannot be achieved in the construction of each beam.

  Therefore, an object of the present invention is to provide a joining structure and a joining method for a precast member, which can shorten the construction period, save labor, and have a high degree of freedom in construction.

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

  The first joint reinforcement and the second joint reinforcement may be diagonal reinforcements.

  As a joining method, the present invention includes a first precast concrete beam member in which a first joint reinforcing bar and a first lower end bar project from one beam cross section, and a second joint reinforcing bar and a first cross section from the beam cross section. The second precast concrete beam member overhanging the second lower end bar, the first joint reinforcing bar and the second joint reinforcing bar form a first perforated lap joint, and the first A beam joint is constructed by joining the first precast concrete beam member and the second precast concrete beam member so that the lower end bar and the second lower end bar form a second open lap joint. Then, a joint is formed by the upper end connecting bar and the lower end connecting bar overhanging from the precast concrete column at the joint part provided on the other beam cross section of the first precast concrete beam member, and the beam joint part, Of the concrete having the same strength and a lower strength than the concrete strength of the first and second precast concrete beam members to the floor slab part of which is integrally formed with the beam joint. Is characterized by.

  According to the present invention, it is possible to shorten the construction period, save labor, and increase the degree of freedom in construction.

(A) is a front sectional view of a joint structure of a precast member according to an embodiment of the present invention, (b) is a side sectional view taken along the line Ib-Ib in (a), and (c) is (a) The side surface sectional view shown by the Ic-Ic section line of FIG. (A) is a front sectional view of a precast member for a general part according to an embodiment of the present invention, (b) is a side sectional view taken along the IIb-IIb sectional line of (a), (c) and (d). Drawing (c) is a front sectional view of a precast member for terminal parts concerning an embodiment of the present invention, and (d) is a precast member arranged in a direction which intersects with a precast member concerning an embodiment of the present invention. Front sectional view. The schematic beam hiding figure which partially showed the beam structure comprised with the precast member which concerns on embodiment of this invention. (A) is a front sectional view of one beam member in the first span (and second span) of the joining method for precast members according to the embodiment of the present invention, and (b) is the other beam member. The front cross-sectional view at the time of arrangement, (c) is a front cross-sectional view at the time of stirrup reinforcement and upper end reinforcement arrangement. (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 front cross-sectional view after placing concrete on the beam joint and the floor slab after the stirrup reinforcement and the upper end reinforcement are arranged.

  The joining structure and joining method of the precast member of the present invention will be described below with reference to the accompanying drawings. In addition, the same components are denoted by the same reference numerals, and description thereof will be 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 each of FIG. 1 and FIGS. 2A to 2D is integrally provided on an upper portion of a beam cross section. This is a precast member in which the part corresponding to the thickness of the floor slab is cast-in-place concrete. As shown in FIG. 3, the joining structure J1 of the precast members includes beam members 1A and 1A (or beam member 1A) having a beam end joining portion 10 at one end in the beam longitudinal direction, and a beam member to be arranged at the end described later. 1B) and the beam member 1A (or the beam member 1B) and the beam member 2A (or the beam member 2B) arranged on the pillar are joined (the pillar side surface joint portion 6). Composed of structure. As shown in each drawing of FIG. 1, the beam joint portion 5 secures the covering thickness of the stirrup streak 11 and the upper end streak 17 arranged between the beam end joints 10 and 10 so that the floor slab concrete 41 is cast. Simultaneously with the construction, the cast-in-place concrete 13 having the same strength as the floor slab concrete 41 is cast to be integrally formed. The shape of these beam end joints 10 and 10 is, as an example, shown in each of FIGS. 3 and 4, in which beam members 1A and 1B are continuously installed between pillar members P1 and P2, It is supposed to be joined at the central position. The column side surface joint portion 6 has an upper end connecting line 26 and a lower end connecting line 27 (or an upper end penetrating line 51 and a lower end penetrating line 52) at the joint parts 19 and 20 provided on the beam end connecting part 30 at the other end in the beam longitudinal direction. Are connected to form a joint.

<Structure of beam joint>
Hereinafter, configurations and the like 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-produced precast members, and the beam end joint portions 10 and 30 are provided at the beam end portions.

(Structure of beam member 1A)
As shown in each of FIG. 2A, FIG. 3 and FIG. 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 installed between the pillar members P1 and P2 (or between the pillar members P2 and P2). From the end surface 14 of the beam cross section of the beam end joint portion 10, diagonal reinforcing bars 15, 16, upper end bars 17, and lower end bars 18 are arranged so as to project in the beam longitudinal direction. Joint portions 19 and 20 are provided on the end surface of the beam end joint portion 30. This end face is installed so as to be flush with the end face of the pillar member P1 (P2) described below, where the upper end through hole 28 and the lower end through hole 29 are provided.

  As shown in FIGS. 2A and 2B, in the present embodiment, two diagonal reinforcing bars 15 are horizontally arranged in the beam longitudinal direction in the upper part of the beam near the upper end bar 17, and the end surface 14 of the beam cross section. About 45 ° diagonally downward. The projecting length of the diagonal reinforcing bar (diameter d1) 15 is 30 × d1.

  The diagonal reinforcing bar 16 projects approximately 45 ° obliquely upward from the vicinity of the end surface 14 of the beam cross section. The projecting length of the diagonal reinforcing bar (diameter d2) 16 is 30 × d2.

  The upper end streak 17 extends horizontally from the end surface 14 of the beam cross section, and the tip thereof has a right-angled hook shape downward. The overhang length of the upper end streak 17 (diameter d3) is 40 × d3 including the tip of the hook.

  The lower end streak 18 juts out horizontally from the end surface 14 of the beam cross section, and the tip thereof has a right-angled hook shape facing upward. The extension length of the lower end streak 18 (diameter d4) is 40 × d4 including the tip of the hook.

  In the present embodiment, the joint portions 19 and 20 are mechanical joints. An upper end streak 17 and a lower end streak 18 are arranged at the beam inner ends of the joint portions 19 and 20. At the beam outer ends of the joint parts 19 and 20, upper end connecting bars 26 (51) and lower end connecting bars 27 (52) of the beam member 2A (2B) are arranged. This mechanical joint connects the upper end connecting bars 17 and the upper end. The line 26 (51), the lower end line 18 and the lower end connection line 27 (52) are integrally joined.

(Structure of beam member 1B)
As shown in each of FIG. 2C, FIG. 3 and FIG. 4, the beam member 1 </ b> B is a beam that is finally installed in a span constructed from the middle pillar P <b> 2 to the outer pillar P <b> 1. The oblique reinforcing bars 15a and 16a of the beam member 1B are different from the oblique reinforcing bars 15a and 16a of the beam member 1A in projecting angles. The length of the beam member 1B in the longitudinal direction of the beam is set shorter than the length of the beam member 1A in the longitudinal direction of the beam by considering the overhang length F1 of the upper connecting strip 26 and the lower connecting strip 27.

  As shown in FIGS. 2B and 2C, in the present embodiment, the diagonal reinforcing bar 15a projects obliquely downward by about 28 ° from the vicinity of the end face 14 of the beam cross section. The projecting length of the diagonal reinforcing bar (diameter d5) 15a is 30 × d5.

  The diagonal reinforcing bar 16a extends obliquely upward by about 28 ° from the vicinity of the end surface 14 of the beam cross section. The projecting length of the diagonal reinforcing bar (diameter d6) 16a is 30 × d6.

(Structure of beam member 2A)
As shown in each of FIG. 2D, FIG. 3 and FIG. 4, the beam member 2A has a beam end joint portion 10 at one end in the beam longitudinal direction. The beam member 2A is provided with beam members 1A and 1B on a column member P1 which is an outer column facing the outer periphery (or a middle column facing the blow-through space inside where the beam does not extend to the span beyond the column). It will be installed in the intersecting direction.

  A column-shaped portion 25 having the same cross section as the column member P1 is formed at one end of the beam member 2A in the beam longitudinal direction. In the pillar-shaped portion 25, a pillar main bar through hole 22 for inserting the column main bar 23 of the pillar member P1 is formed. In addition, as shown in FIGS. 1 (a) and 2 (d), the pillar-shaped portion 25 has the upper end connecting bar 26 and the lower end connecting bar 27 protruding from one of the beam width directions (inside the building). Is arranged.

(Structure of beam member 2B)
As shown in each of FIG. 2E, FIG. 3 and FIG. 4, the beam member 2B has beam end joints 10 at both ends in the beam longitudinal direction. From the end surfaces 14 of the beam cross section at both ends of the beam end joint portion 10, diagonal reinforcing bars 15, 16 and upper end bars 17 and lower end bars 18 are arranged so as to project in the beam longitudinal direction. The beam member 2B is erected on the column member P2 as the middle column so that the column main bar 23 penetrates the inside.

  A column-shaped portion 25 having the same cross section as the column member P2 is formed in the middle of the beam member 2B in the beam longitudinal direction. In the pillar-shaped portion 25, a pillar main bar through hole 22 for inserting the column main bar 23 of the pillar member P2 is formed. Further, in the pillar-shaped portion 25, an upper end through hole 28 and a lower end through hole 29 for inserting the upper end penetrating line 51 and the lower end penetrating line 52 are formed in the beam width direction. Other configurations are the same as those of the beam member 1A.

(Other configurations)
As shown in FIGS. 1A and 1B, the stirrup reinforcement 11 is arranged so as to surround the diagonal reinforcing reinforcements 15 and 16, the upper end reinforcement 17, and the lower end reinforcement 18.

<Structure 1 of bonded structure>
A joint structure J1 of a precast concrete beam member (precast beam member) will be described with reference to each drawing of FIG. In the joint structure J1 of the precast beam members, the beam joint portion 5 has the beam end joint portions 10, 10 of the beam members 1A (2A, 2B: abbreviated below), 1A (2B, 2B: abbreviated below) at a predetermined distance D1. It is configured to face each other with a space. Between the beam members 1A and 1A, the diagonal reinforcing bar 15 (16) of the one beam member 1A and the diagonal reinforcing bar 16 (15) of the other beam member 1A which face each other form an open lap joint to generate shear force. It functions as a transmitting member. Further, the upper end streaks 17 and 17 of the beam members 1A and 1A form a lap lap joint and function as the upper end streaks of the beam between the column members P and P. The lower end reinforcements 18, 18 of the beam members 1A, 1A form a perforated lap joint and function as the lower end reinforcements of the beam between the column members P, P. In each of the perforated lap joint portions, the perforated dimension S is 0.2 LE and 150 mm or less, and the perforated lap joint length LE = 30 × rebar diameter. Between the end surfaces 14 and 14 of the beam cross-sections of the beam members 1A and 1A, there is a cast-in-place concrete 13 that is integral with the floor slab 40 and has the same strength as the floor slab concrete and a strength lower than the concrete strength of the beam member 1A. It has been cast. The reinforcing bars forming the perforated lap joint are arranged in the beam width direction so that they do not interfere with each other when the beam members are hung, as shown in FIG. Has been done.

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

  Usually, in precast concrete construction, the cast-in-place concrete at the beam joint has a required strength higher than that of the floor slab concrete, and therefore it is not possible to cast them simultaneously and integrally. However, in the present invention, the joint reinforcing bar composed of the diagonal reinforcing bar 15 of the beam member 1A and the diagonal reinforcing bar 16 of the other beam member 1A and the diagonal reinforcing bar 16 of the beam member 1A and the diagonal reinforcing bar of the other beam member 1A. Since the joint reinforcing bar composed of 15 transmits a part of the shearing force at the beam joint, 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 set to the beam member 1A. The floor slab 40 immediately above 1A can have the same strength as the floor slab concrete having a lower strength than the beam members 1A and 1A. Therefore, it is possible to simultaneously cast the cast-in-place concrete 13 integrally between the end surfaces 14, 14 of the design beam cross section of the beam members 1A, 1A and a part of the floor slab 40 immediately above the beam members 1A, 1A. Further, since the tip ends of the upper end streak 17 and the lower end streak 18 have a right-angled 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 The amount of placement can be reduced. Further, the beam side joint 6 is a mechanical joint and therefore does not require cast-in-place concrete.

<Structure 2 of bonded structure>
The joint structure J2 of the precast concrete beam member (precast beam member) will be described with reference to FIGS. The joint structure J2 of the precast beam members is formed in the column span in which the beam members are finally arranged. In the joining structure J2 of the precast beam members, the beam joining portion 5a is configured by facing the beam end joining portions 10, 10 of the beam members 1A-5, 1B with a predetermined gap D1 + F1. Between the beam members 1A-5 and 1B, the diagonal reinforcing bars 15a (16a) of the beam member 1A-5 and the diagonal reinforcing bars 16a (15a) of the beam member 1B form a lap joint to transmit shear force. Function as. Between the end faces 14 and 14 of the beam cross sections of the beam members 1A-5 and 1B, it is integral with the floor slab 40, has the same strength as the floor slab concrete, and is lower in strength than the concrete strength of the beam members 1A-5 and 1B. In-situ concrete 13 is placed.

<Method of joining precast beam members>
Next, a method of 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 which is placed on the column member P1 which is an outer column and integrally joined. The beam member 1A-1 is hung almost vertically toward the joining position, the upper end connecting line 26 of the beam member 2A-1 is fitted to the joint portion 19 of the beam member 1A-1, and the lower end of the beam member 2A-1. After fitting the connecting line 27 to the joint portion 20 of the beam member 1A-1, the joint portions 19 and 20 are filled with grout material to form a joint. At this time, as shown in FIG. 4B, the beam member 1A-1 is supported by the pipe support 50.

  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. To 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 respectively form an open lap joint, and the upper end bar 17 (of the beam member 1A-1 The beam end joints 10 and 10 are opposed to each other so that the lower end streak 18) and the upper end streak 17 (the lower end streak 18) of the beam member 1A-2 form an open lap joint, and are suspended at the beam joint position. The beam member 1A-2 is also supported by the pipe support 50.

  Prior to the pouring work of the cast-in-place concrete 13, as shown in FIG. 4C, the upper end is inserted into the upper end through hole 28 of the beam member 2B-1 from the side where the beam member 1A-2 is not arranged. The penetrating line 51 is inserted, and the lower end penetrating line 52 is inserted into the lower end through hole 29. Further, the stirrup streak 11 is arranged between the beam members 1A-1 and 1A-2. At the same time, reinforcement of a floor slab (not shown) is also performed. Then, in order to complete the design concrete section, at the same time between the beam members 1A-1, 1A-2 and on the floor slab portion above the beam members 1A-1, 1A-2, with the same strength as the floor slab concrete, and A cast-in-place concrete 13 having a strength lower than the concrete strength of the beam members 1A-1 and 1A-2 is poured to form a joint structure J1 of the precast members.

  Next, as shown by replacing the column member P1 in FIG. 4A with the column member P2 after inserting the upper end penetrating line 51 and the lower end penetrating line 52 in FIG. 4C, the column member P1 is adjacent to the first span. In the second span, the beam member 1A-3 is joined to the beam member 2B-1 arranged 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, so that the upper end penetrating line 51 as the upper end connecting line of the beam member 2B-1 is attached to the beam member 1A. -3, and the lower end penetrating 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. Then, the joint portions 19 and 20 are filled with grout material to form a joint.

  Subsequently, as shown by replacing the column member P1 of FIG. 4B with the column member P2 after inserting the upper end penetrating line 51 and the lower end penetrating line 52 of FIG. 4C, the column member is a middle column. The beam member 1A-4 is joined to the beam member 2B-2 arranged on P3, and at the same time, the beam member 5 is formed by the beam member 1A-3 and the beam member 1A-4. Also in this case, a predetermined perforated lap joint can be formed in each part.

  Further, in the beam members 1A-3 and 1A-4, the joining structure J1 of the precast members is formed through similar steps.

  Next, as shown in FIG. 5A, the beam member 1A-3 is joined to the beam member 2B-1 arranged 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 process as the process (paragraph 0036).

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

  Thereafter, through the same steps, as shown in FIG. 5C, the joint structure J2 of the precast members is formed at the same time as the floor slab is constructed.

  The joining structure J2 of the precast member is usually formed on the outer column on which the beam member is finally installed, but the joining structure J2 may be formed on the span of only the middle column. If the joint structure J2 is formed on the span of only the middle pillar, the beam member of this span can be arranged later. As a result, the degree of freedom in erection of the beam member can be increased.

[Modification]
In the above-mentioned embodiment, the stigma portion is a beam win (configuration in which the precast concrete columnar body is formed by the column member and the beam member of the portion placed on the column member). It is also possible that the pillar wins (the precast concrete pillar is formed only by the pillar member), and the upper end joint bar, the lower end joint bar or the upper end through hole and the lower end through hole are arranged on the upper part of the pillar member. As a result, since it is not necessary to use the beam members 2A and 2B, it is possible to contribute to cost reduction by manufacturing a small number of types of beam members in a large amount, reduce the number of types of beam member construction procedures, and shorten the construction period. It also leads to labor saving.

  It should be noted that the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims. That is, an embodiment obtained by combining technical means appropriately modified within the scope of the claims is also included in the technical scope of the present invention.

1,1A, 1B, 2A, 2B (precast concrete) Beam member 6 Column side joint 10,30 Beam end joint 11 Stirrup bar 13 Cast-in-place concrete 14 End face 15,16 Diagonal reinforcement bar 17 Upper end bar 18 Lower end bar 19 , 20 Joint part 21 Stirrup muscle 22 Column main muscle through hole 23 Column main muscle 24 Column top end 25 Column type part 31 Side surface 32, 33 Side diagonal reinforcing reinforcement 34 Side lower end reinforcement J1, J2 Joint structure P1, P4 Column member ( Outer pillar)
P2, P3 pillar member (middle pillar)

Claims (7)

With a precast concrete column body with upper end connecting bars and lower end connecting bars protruding laterally,
A first precast concrete beam member having a first joint reinforcing bar, a first upper end bar and a first lower end bar overhanging from one beam cross section, and a joint part on the other beam cross section,
A second precast concrete beam member having a second joint reinforcing bar, a second upper end bar and a second lower end bar overhanging from the beam cross section,
Equipped with
The beam-column 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 part,
A first perforated lap joint by the first joint reinforcing bar and the second joint reinforcing bar, a second perforated joint by the first upper end bar and the second upper end bar, A beam joint between the first precast concrete beam member and the second precast concrete beam member having a third perforated lap joint by the first lower end bar and the second lower end bar is constructed,
Part of the concrete of the beam joint has the same strength as the concrete of the floor slab integrally formed with the beam joint, and has a lower strength than the concrete strength of the first and second precast concrete beam members. The joint structure of precast concrete members, characterized in that it is in-situ cast concrete.   The precast concrete member joining structure according to claim 1, wherein the first joining portion reinforcing bar and the second joining portion reinforcing bar are diagonal reinforcing bars. The second precast concrete beam member has another joint portion on the beam cross section on the side opposite to the beam cross section where the second joint reinforcing bar is overhanging,
A joint is formed by the upper end connecting bar and the lower end connecting bar protruding from another precast concrete column at the other joint part,
The beam length of the said 2nd precast concrete beam member is shorter than the beam length of the said 1st precast concrete beam member, The joint structure of the precast concrete member of Claim 1 or 2 characterized by the above-mentioned.   The precast concrete column member is a precast concrete column member, or is composed of a part of the precast concrete beam member placed on the precast concrete column member and the precast concrete column member, The precast concrete member joining structure 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 upper end reinforcements and the first and second lower end reinforcements have hook-shaped tips. Junction structure. The first precast concrete beam member with the first joint reinforcing bar and the first lower end bar projecting from one beam section, and the second joint reinforcing bar and the second lower end bar projecting from the beam section The second precast concrete beam member, the first joint reinforcing bar and the second joint reinforcing bar form a first open lap joint, the first lower end bar and the second lower end To form a second perforated lap joint with streaks, construct a beam joint by joining the first precast concrete beam member and the second precast concrete beam member,
The first precast concrete beam member to form a joint by the upper end connection bar and the lower end connection bar overhanging from the precast concrete column at the joint section provided on the other beam cross section,
The beam joint portion and the floor slab, a part of which is integrally formed with the beam joint portion, have the same strength and lower strength than the concrete strength of the first and second precast concrete beam members. A method for joining precast concrete members, which comprises placing concrete.   The second precast concrete beam member is an upper end connection projecting from another precast concrete column to another joint portion provided on the beam cross section on the side opposite to the beam cross section where the second joint reinforcing bar projects. The precast concrete according to claim 6, wherein a joint is formed by a bar and a lower end connecting bar, and a beam length of the second precast concrete beam member is shorter than a beam length of the first precast concrete beam member. Method of joining members.

Images