JP7178210B2 - Concrete member joint structure and concrete structure - Google Patents

Description

TECHNICAL FIELD The present invention relates to a joint structure of concrete members and a concrete structure.

In recent years, when constructing concrete structures such as bridges and buildings, in order to shorten the construction period and improve quality, multiple precast concrete members manufactured in advance at a factory are joined at the construction site. there is

For example, in Patent Document 1, when joining the lower column member 1 and the upper column member 2, inside the sleeve joint 5 provided at the upper end of the lower column member 1, from the lower column member 1 The grout injected inside the sleeve joint 5 is hardened while the tip of the lower column main reinforcement 3 protruding inside the sleeve joint 5 and the tip of the upper column main reinforcement 4 protruding downward from the upper column member 2 are butted against each other. A joint structure for laminated concrete members is disclosed.

JP 2017-96059 A

However, in the joint structure of concrete members disclosed in Patent Document 1, when a tensile force acts along the axial direction of the lower pillar main reinforcement 3 and the upper pillar main reinforcement 4, the tip of the lower pillar main reinforcement 3 and the upper pillar main reinforcement 4, the tip of the lower pillar main reinforcement 3 and the tip of the upper pillar main reinforcement 4 are separated from each other, so the tension between the tip of the lower pillar main reinforcement 3 and the tip of the upper pillar main reinforcement 4 Directional forces are transmitted through sleeve joints 5 in the following manner: lower column main reinforcement 3→sleeve joint 5→upper column main reinforcement 4 or upper column main reinforcement 4→sleeve joint 5→lower column main reinforcement 3. Therefore, the sleeve joint 5 must have sufficient strength so that the force in the tensile direction does not cause cracks or breakage. , there was a problem.

The present invention has been made in view of such circumstances, and is capable of securing strength against tensile forces acting along the axial direction of reinforcing bars without using special products for joints. An object of the present invention is to provide a joint structure of members and a concrete structure.

A joint structure of concrete members according to an embodiment of the present invention includes:
A joint structure of concrete members in which a first joint surface of a first concrete member and a second joint surface of a second concrete member are opposed to each other and joined with a curing agent,
The first concrete member includes a hollow reinforcing member disposed on the first joint surface side and having an opening in the first joint surface, and an end portion protruding inside the reinforcing member. and a first reinforcing bar embedded in the first concrete member,
The second concrete member includes a second reinforcing bar embedded in the second concrete member such that the end protrudes from the second joint surface,
The curing agent is filled inside the reinforcing member, the end of the second reinforcing bar is inserted into the reinforcing member through the opening, and the end of the first reinforcing bar and the first reinforcing bar are inserted into the reinforcing member. Hardened in a state where the ends of the reinforcing bars of 2 overlap along the axial direction of the reinforcing member,
It is characterized by

A joint structure of concrete members according to an embodiment of the present invention includes:
The first concrete member is
a hollow formwork member disposed on the first joint surface side and outside the reinforcing member so as to surround the outer periphery of the reinforcing member and having an opening in the first joint surface; further prepared,
The hardening agent is filled inside the formwork member, the end of the second reinforcing bar is inserted into the reinforcing member from the opening of the reinforcing member, and the hardening agent of the first reinforcing bar is inserted into the reinforcing member. Hardened in a state in which the end and the end of the second reinforcing bar are overlapped along the axial direction,
It is characterized by

A joint structure of concrete members according to an embodiment of the present invention includes:
The first concrete member is
Further comprising a hollow formwork member disposed on the first joint surface side and inside the reinforcing member and having an opening in the first joint surface,
The reinforcing member is embedded in the first concrete member so as to surround the outer periphery of the formwork member,
The first reinforcing bar is embedded in the first concrete member so that the end protrudes inside the formwork member,
The hardening agent is filled inside the formwork member, the end of the second reinforcing bar is inserted into the formwork member from the opening of the formwork member, and the first reinforcing bar is filled with the hardening agent. Hardened in a state where the end and the end of the second reinforcing bar are overlapped along the axial direction,
It is characterized by

A joint structure of concrete members according to an embodiment of the present invention includes:
The first concrete member includes a plurality of the first reinforcing bars,
The second concrete member comprises a plurality of the second reinforcing bars,
The hardening agent is inserted into the reinforcing member through the opening at the ends of the plurality of second reinforcing bars, and the curing agent is applied between the ends of the plurality of first reinforcing bars and the plurality of second reinforcing bars. cured in a state in which the ends are overlapped along the axial direction;
It is characterized by

A joint structure of concrete members according to an embodiment of the present invention includes:
The ends of the plurality of first reinforcing bars or the ends of the plurality of second reinforcing bars have different lengths in the axial direction,
It is characterized by

A joint structure of concrete members according to an embodiment of the present invention includes:
The first reinforcing bar or the second reinforcing bar has one or more flange-like projections formed at the end,
It is characterized by

A concrete structure according to an embodiment of the present invention comprises:
A plurality of concrete members are joined by the joining structure of the concrete members,
It is characterized by

According to the joint structure of concrete members and the concrete structure according to the embodiment of the present invention, the end of the first reinforcing bar and the end of the second reinforcing bar overlap along the axial direction of the reinforcing member. , the overlapping portion where the end of the first reinforcing bar and the end of the second reinforcing bar are overlapped is surrounded by a reinforcing member, and the inside of the reinforcing member is filled with a hardening agent and hardened.

Therefore, when a tensile force acts along the axial direction of the first reinforcing bar and the second reinforcing bar, the end of the first reinforcing bar and the end of the second reinforcing bar move along the axial direction of the reinforcing member. Due to the overlap, the transmission of force in the tensile direction between the end of the first rebar and the end of the second rebar is transferred to the first rebar through the stiffener, not through the reinforcing member. and the end of the second rebar. At this time, a force acts on the hardening agent so as to expand it radially outward of the reinforcing member. It is possible to reduce the occurrence of cracks in the curing agent, so that the bonding between the first reinforcing bar and the second reinforcing bar through the curing agent can be strengthened. Therefore, it is possible to secure the strength against the force in the tensile direction acting along the axial direction of the reinforcing bar without using a highly functional and expensive exclusive product as the reinforcing member.

Further, for example, even if a large force acts on the first and second concrete members due to an earthquake or the like and the concrete outside the reinforcing member is destroyed, the hardening agent inside the reinforcing member is surrounded by the reinforcing member. Since the hardening agent is protected by the hardening agent, it is possible to prevent the hardening agent from being destroyed, and the bonding of the first reinforcing bar and the second reinforcing bar via the hardening agent can be maintained, so a large force can be applied. It can also be used on sites that receive it.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is an exploded perspective view showing an outline of a joining structure of concrete members according to a first embodiment of the present invention; 1 shows a joint structure of concrete members according to a first embodiment of the present invention, where (a) is a vertical cross-sectional view and (b) is a cross-sectional view taken along the line II-II. 1 shows a joint structure of concrete members according to a first embodiment of the present invention, where (a) is an enlarged longitudinal sectional view and (b) is a sectional view taken along line III-III. FIG. 3 is a vertical cross-sectional view showing each step in the method for joining concrete members according to the first embodiment of the present invention, where (a) is the first step, (b) is the second step, and (c) is the third step. It is a figure which shows the process of. FIG. 2 shows a joint structure of concrete members according to a first modification of the first embodiment of the present invention, where (a) is an enlarged vertical cross-sectional view and (b) is a cross-sectional view taken along line VV. FIG. 10 shows a joint structure of concrete members according to a second modification of the first embodiment of the present invention, where (a) is an enlarged longitudinal sectional view and (b) is a sectional view taken along the line VI-VI. FIG. 12 shows a joint structure of concrete members according to a second embodiment of the present invention, where (a) is an enlarged vertical cross-sectional view and (b) is a cross-sectional view taken along the line VII-VII. FIG. 8 shows a joint structure of concrete members according to a modified example of the second embodiment of the present invention, where (a) is an enlarged vertical cross-sectional view and (b) is a cross-sectional view taken along line VIII-VIII. FIG. 10 shows a joint structure of concrete members according to a third embodiment of the present invention, where (a) is an enlarged vertical cross-sectional view and (b) is a cross-sectional view taken along the line IX-IX. FIG. 10 shows a joint structure of concrete members according to a modified example of the third embodiment of the present invention, where (a) is an enlarged vertical cross-sectional view and (b) is a cross-sectional view taken along the line XX. FIG. 10 shows a joint structure of concrete members according to a modified example of the fourth embodiment of the present invention, where (a) is an enlarged vertical cross-sectional view and (b) is a cross-sectional view taken along the line XI-XI. It is a longitudinal section showing each process in the joining method of concrete members concerning a 4th embodiment of the present invention, (a) is a figure showing a 1st process, and (b) is a figure showing a 2nd process. It is a longitudinal section showing each process in the joining method of concrete members concerning a 4th embodiment of the present invention, (a) is a figure showing the 3rd process, and (b) is a figure showing the 4th process.

DETAILED DESCRIPTION OF THE INVENTION A concrete joint structure and a concrete structure according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

(First embodiment)
FIG. 1 is an exploded perspective view showing an outline of a joining structure of concrete members according to a first embodiment of the present invention. FIG. 2 shows a joint structure of concrete members according to a first embodiment of the present invention, where (a) is a vertical cross-sectional view and (b) is a cross-sectional view taken along line II-II. FIG. 3 shows a joint structure of concrete members according to a first embodiment of the present invention, (a) being an enlarged longitudinal sectional view and (b) being a sectional view taken along line III-III.

A concrete structure 1 represents, for example, a part of a pillar or beam that supports a structure such as a bridge or a building, and is formed by joining a plurality of first and second concrete members 2 and 3 made of precast concrete. constructed in

The first concrete member 2 is arranged on the lower side of the concrete structure 1 and has a first joint surface 20 on its upper surface to be joined with the second concrete member 3 . The second concrete member 3 is arranged on the upper side of the concrete structure 1 and has a second joint surface 30 on the lower surface thereof to be joined with the first concrete member 2 . Therefore, the first concrete member 2 and the second concrete member 3 are arranged so that the first joint surface 20 and the second joint surface 30 face each other. The cross-sectional shape of the first and second concrete members 2 and 3 is quadrangular, but may be other polygonal or, for example, a curved outer shape such as a circle.

The first concrete member 2 includes a plurality of first reinforcing bars 21 arranged in parallel with the height direction of the first concrete member 2 as main bars of the first concrete member 2, and a first joint surface 20. A plurality of recesses 22 formed on the side and a plurality of reinforcing members 23A respectively arranged in the plurality of recesses 22 are arranged in parallel in the horizontal direction so as to surround the plurality of first reinforcing bars 21. , and a plurality of ties (not shown) embedded in the first concrete member 2 . In addition, the first concrete member 2 may be provided with an inner winding spiral bar in which the reinforcing bars are spirally wound inside the plurality of first reinforcing bars 21 .

With one first reinforcing bar 21 and one recessed portion 22 as one set, a plurality of sets of first reinforcing bars 21 and recessed portions 22 are formed inside the side surface of the first concrete member 2 as shown in FIG. are arranged at predetermined intervals along the

The reinforcing member 23A is made of a hollow steel pipe. 23 A of reinforcement members are arrange|positioned by the recessed part 22 formed in the 1st joint surface 20 side so that the axial direction of 23 A of reinforcement members may become parallel to the axial direction of the 1st reinforcing bar 21. As shown in FIG. The reinforcing member 23A has an opening 230 on the first joint surface 20 and a bottom 231 on the opposite side of the opening 230 . Note that the reinforcing member 23A may have the bottom portion 231 and the cylindrical portion as separate bodies, or may have a cylindrical shape by omitting the bottom portion 231 .

Further, the reinforcing member 23A functions as a formwork for forming the recess 22 by being arranged at a position where the recess 22 is to be formed when the first concrete member 2 is placed at the factory. When another member is used as a formwork for forming the recess 22, the reinforcing member 23A may be arranged at the factory after curing with concrete, or may be arranged at the construction site.

The first reinforcing bar 21 is embedded in the first concrete member 2 so that the first reinforcing bar end 210 protrudes inside the reinforcing member 23A through the bottom 231 of the reinforcing member 23A. The first reinforcing bar 21 is desirably a deformed reinforcing bar, but a round bar with projections may also be used. Also, the first reinforcing bar 21 may be a bundle of a plurality of reinforcing bars or may be arranged in parallel.

The second concrete member 3 is arranged horizontally parallel to a plurality of second reinforcing bars 31 arranged parallel to the height direction of the second concrete member 3 as the main reinforcement of the second concrete member 3 . and a plurality of ties (not shown) embedded in the second concrete member 3 so as to surround the plurality of second reinforcing bars 31 . In addition, the second concrete member 3 may be provided with an inner winding spiral reinforcement in which the reinforcing bars are spirally wound inside the plurality of second reinforcing bars 31 .

A plurality of second reinforcing bars 31 are arranged at predetermined intervals along the inside of the side surface of the second concrete member 3 . The second reinforcing bar 31 is embedded in the second concrete member 3 so that the second reinforcing bar end 310 protrudes from the second joint surface 30 . Although it is desirable to use a deformed reinforcing bar for the second reinforcing bar 31, a round bar with projections may be used. Also, the second reinforcing bar 31 may be a bundle of a plurality of reinforcing bars or may be arranged in parallel.

As shown in FIGS. 2A and 3A, the first concrete member 2 and the second concrete member 3 are arranged such that the first joint surface 20 and the second joint surface 30 face each other. The second reinforcing bar end 310 is inserted into the reinforcing member 23A from the opening 230, and the first reinforcing bar end 210 and the second reinforcing bar end 310 are arranged in the reinforcing member 23A. 23A are arranged in an overlapping state along the axial direction. As shown in FIG. 3A, the first reinforcing bar end portion 210 and the second reinforcing bar end portion 310 are arranged in a state of being overlapped by a predetermined distance L1 along the axial direction of the reinforcing member 23A. be. Note that the inner diameter of the reinforcing member 23A may be changed as appropriate, and the distance between the reinforcing member 23A and the first reinforcing bar end 210 or the second reinforcing bar end 310 in the radial direction of the reinforcing member 23A, The distance between the first reinforcing bar end 210 and the second reinforcing bar end 310 in the radial direction of the reinforcing member 23A may also be changed as appropriate.

The hardening agent 4 is filled inside the reinforcing member 23A, and as described above, the second reinforcing bar end 310 is inserted through the opening 230 into the reinforcing member 23A, and the first reinforcing bar end 210 and the first reinforcing bar end 310 are inserted into the reinforcing member 23A. 2 are overlapped along the axial direction of the reinforcing member 23A. The curing agent 4 is made of, for example, mortar, cement, resin, or the like.

Next, a method for joining concrete members according to the first embodiment will be described. FIG. 4 is a longitudinal sectional view showing each step in the method for joining concrete members according to the first embodiment of the present invention, where (a) is the first step, (b) is the second step, (c ) shows the third step.

First, in the first step shown in FIG. 4(a), a first concrete member 2 prefabricated in a factory is arranged at a predetermined position by a crane or the like at the construction site of the concrete structure 1. . At this time, each of the recesses 22 is provided with a reinforcing member 23A. Then, the liquid curing agent 4a before curing is injected from the opening 230 to fill the inside of the reinforcing member 23A.

Next, in the second step shown in FIG. 4(b), the second concrete member 3 prefabricated at the factory is placed so that the first joint surface 20 and the second joint surface 30 face each other. It is disposed above the first concrete member 2 by a crane or the like. At this time, the second reinforcing bar end 310 is inserted inside the reinforcing member 23A from the opening 230, and the first reinforcing bar end 210 and the second reinforcing bar end 310 are aligned in the axial direction of the reinforcing member 23A. It is arranged in an overlapping state along the line.

Next, in a fourth step shown in FIG. 4(c), the curing agent 4 is cured over a predetermined period of time, so that the first concrete member 2 and the second concrete member 3 are joined together. be.

In this way, the second concrete member 3 is joined to the upper side of the first concrete member 2, and another concrete member is successively joined to the upper side of the second concrete member 3 by the same joining method. , a concrete structure 1 is constructed.

(First Modification of First Embodiment)
FIG. 5 shows a joint structure of concrete members according to a first modification of the first embodiment of the present invention, where (a) is an enlarged longitudinal sectional view and (b) is a sectional view taken along line VV. In a first modification of the first embodiment, a plurality of first reinforcing bar ends 210 and a plurality of second reinforcing bar ends 310 are arranged inside a reinforcing member 23A. It was changed to be set.

A plurality of first reinforcing bars 21 are embedded in the first concrete member 2 such that two first reinforcing bar ends 210 protrude inside the reinforcing member 23A. A plurality of second reinforcing bars 31 are embedded in the second concrete member 3 so that two second reinforcing bar ends 310 are inserted inside the reinforcing member 23A.

Therefore, when the second concrete member 3 is arranged on the upper side of the first concrete member 2 so that the first joint surface 20 and the second joint surface 30 face each other, FIG. , two second reinforcing bar ends 310 are inserted through the openings 230 inside the reinforcing member 23A so that the two first reinforcing bar ends 210 and the two second reinforcing bar ends 310 are , are arranged in an overlapping state along the axial direction of the reinforcing member 23A.

At this time, as shown in FIG. 5A, the two first reinforcing bar ends 210 and the two second reinforcing bar ends 310 are separated by a predetermined distance L2 along the axial direction of the reinforcing member 23A. They are arranged in an overlapping state. Further, as shown in FIG. 5B, the two first reinforcing bar ends 210 and the two second reinforcing bar ends 310 are arranged alternately in the circumferential direction of the reinforcing member 23A. 23A.

In addition, in the first modification, the two first reinforcing bar ends 210 and the two second reinforcing bar ends 310 are arranged inside the reinforcing member 23A. The first rebar end 210 and three or more second rebar ends 310 may be provided. Also, the number of first rebar ends 210 and the number of second rebar ends 310 may be different, for example one first rebar end 210 and two second rebar ends. Alternatively, there may be four first rebar ends 210 and two second rebar ends 310 .

(Second Modification of First Embodiment)
FIG. 6 shows a joint structure of concrete members according to a second modification of the first embodiment of the present invention, where (a) is an enlarged longitudinal sectional view and (b) is a sectional view taken along line VI-VI. A second modification of the first embodiment is different from the first modification of the first embodiment so that the lengths of the plurality of second reinforcing bar ends 310A and 310B in the axial direction are different. It is what I did.

A plurality of first reinforcing bars 21 are embedded in the first concrete member 2 such that two first reinforcing bar ends 210 protrude inside the reinforcing member 23A. A plurality of second reinforcing bars 31A and 31B are embedded in the second concrete member 3 so that the three second reinforcing bar ends 310A and 310B are inserted inside the reinforcing member 23A. The three second reinforcing bars 31A and 31B have different lengths with respect to the axial direction of the reinforcing member 23A. It is shorter than the length of the two second rebar ends 310A protruding from the position.

Therefore, when the second concrete member 3 is arranged on the upper side of the first concrete member 2 so that the first joint surface 20 and the second joint surface 30 face each other, FIG. As shown in , three second rebar ends 310A, 310B are inserted through openings 230 inside reinforcement member 23A to form two first rebar ends 210 and three second rebar ends 310A. , 310B are arranged in an overlapping state along the axial direction of the reinforcing member 23A.

At this time, as shown in FIG. 6A, the two first reinforcing bar ends 210 and the second reinforcing bar ends 310A are overlapped by a predetermined distance L3 along the axial direction of the reinforcing member 23A. The two first reinforcing bar end portions 210 and the second reinforcing bar end portions 310B are arranged in a state of being overlapped by a predetermined distance L4 (<L3) along the axial direction of the reinforcing member 23A. is set. Further, as shown in FIG. 6B, the two first reinforcing bar ends 210 and the two second reinforcing bar ends 310A are arranged alternately in the circumferential direction of the reinforcing member 23A. 23A and a second rebar end 310B is disposed in the central portion of the reinforcing member 23A.

Although the lengths of the second reinforcing bar ends 310A and 310B are changed in the second modification, the length of the first reinforcing bar end 210 may be changed. Further, the lengths of the plurality of first reinforcing bar ends may be different, and the lengths of the plurality of second reinforcing bar ends may be different. Furthermore, the length of the first rebar end and the length of the second rebar end may be different.

As described above, according to the joint structure of concrete members and the concrete structure 1 according to the first embodiment, the first reinforcing bar end portion 210 and the second reinforcing bar end portion 310 are arranged in the axial direction of the reinforcing member 23A. The overlapping portion of the first reinforcing bar end 210 and the second reinforcing bar end 310 is surrounded by the reinforcing member 23A, and the hardening agent 4 is filled inside the reinforcing member 23A, It is hardened.

Therefore, when a force in the tensile direction acts along the axial direction of the first reinforcing bar 21 and the second reinforcing bar 31, the first reinforcing bar end 210 and the second reinforcing bar end 310 move toward the axis of the reinforcing member 23A. Due to the directional overlap, the transmission of force in the tensile direction between the first rebar end 210 and the second rebar end 310 is achieved through the stiffener 4 and not through the reinforcing member 23A. directly between the first rebar end 210 and the second rebar end 310 . At this time, a force acts on the curing agent 4 so as to expand it radially outward of the reinforcing member 23A. The expansion of the agent 4 is suppressed, and cracking of the hardening agent 4 can be reduced. can. Therefore, it is possible to secure the strength against the force in the tensile direction acting along the axial direction of the reinforcing bar without using a high-performance and expensive exclusive product as the reinforcing member 23A.

Further, for example, even if a large force acts on the first and second concrete members 2 and 3 due to an earthquake or the like and the concrete outside the reinforcing member 23A is destroyed, the hardening agent 4 inside the reinforcing member 23A can be used. is protected by being surrounded by the reinforcing member 23A, it is possible to prevent the hardening agent 4 from being destroyed, and the joining of the first reinforcing bar 21 and the second reinforcing bar 31 via the hardening agent 4 can be maintained, so it can be used in areas that receive a large amount of force.

(Second embodiment)
FIG. 7 shows a joint structure of concrete members according to a second embodiment of the present invention, where (a) is an enlarged longitudinal sectional view and (b) is a sectional view taken along line VII-VII.

In contrast to the concrete member joint structure according to the first embodiment, the concrete member joint structure according to the second embodiment is different from the concrete member joint structure according to the first embodiment. and the second reinforcing bar 31 has a flange-like protrusion 211 formed to expand in diameter from the tip of the second reinforcing bar end 310 in the radial direction. is further provided with a protrusion 311 of . The cross-sectional shape of the protrusions 211 and 311 is circular, but may be polygonal.

(Modification of Second Embodiment)
FIG. 8 shows a joint structure of concrete members according to a modified example of the second embodiment of the present invention, where (a) is an enlarged longitudinal sectional view and (b) is a sectional view taken along line VIII-VIII. A modification of the second embodiment differs from the second embodiment in that the first reinforcing bar end 210 and the second reinforcing bar end 310 each include a plurality of projections 211 and 311. It is.

The first reinforcing bar 21 not only has a flange-shaped projection 211 at the tip of the first reinforcing bar end 210, but also has two flange-shaped projections 211 at the intermediate portion of the first reinforcing bar 21. . In addition, the second reinforcing bar 31 has not only a flange-shaped protrusion 311 at the tip of the second reinforcing bar end 310, but also two flange-shaped protrusions 311 at the intermediate portion of the second reinforcing bar 31. Prepare.

In addition, in the above modification, the first reinforcing bar 21 has three protrusions 211, and the second reinforcing bar 31 has three protrusions 311. The reinforcing bar 31 may have two protrusions or four or more protrusions. Also, the number of protrusions 211 provided on the first reinforcing bar 21 and the number of protrusions 311 provided on the second reinforcing bar 31 may be different. The second reinforcing bar 31 may have two protrusions 311 , or the first reinforcing bar 21 may have four protrusions 211 and the second reinforcing bar 31 may have two protrusions 311 . can be Furthermore, when the first reinforcing bar 21 and the second reinforcing bar 31 are provided with a plurality of protrusions, the cross-sectional shape of each protrusion may be different, or the outer dimensions of the protrusions may be different from each other. You may make it different every.

As described above, according to the joint structure of concrete members and the concrete structure 1 according to the second embodiment, the first reinforcing bar 21 or the second reinforcing bar 31 is connected to the first reinforcing bar end 210 or the second reinforcing bar end 210 . One or more flange-like protrusions 211, 311 formed on the reinforcing bar end 310, the flange-like protrusions 211, 311 radially expanding from the first reinforcing bar 21 or the second reinforcing bar 31. is formed to

Therefore, when a force in the tensile direction acts along the axial direction of the first reinforcing bar 21 and the second reinforcing bar 31, the protrusions 211 and 311 function as resistance to the hardening agent 4. It can improve durability. Therefore, even if the length of the reinforcement member 23A in the axial direction is shortened, it is possible to ensure the strength against the tensile force acting along the axial direction of the reinforcing bar.

(Third Embodiment)
FIG. 9 shows a joint structure of concrete members according to a third embodiment of the present invention, where (a) is an enlarged longitudinal sectional view and (b) is a sectional view taken along line IX-IX.

In the joint structure of concrete members according to the third embodiment, unlike the joint structure of concrete members according to the first embodiment, the first concrete member 2 is a spiral reinforcement in which a reinforcing bar is spirally wound. and a reinforcing member 23B arranged on the side of the first joint surface 20 and arranged outside the reinforcing member 23B so as to surround the outer periphery of the reinforcing member 23B. and a hollow formwork member 26A.

The formwork member 26A is composed of, for example, a sheath pipe or the like, and is arranged at a position where the recess 22 is to be formed when the first concrete member 2 is placed in a factory, thereby forming the recess 22. Acts as a formwork for forming.

The reinforcing member 23B is made of spiral muscle, has an opening 230 in the first joint surface 20, and has a communicating portion 234 that communicates the inside and the outside of the reinforcing member 23B. The reinforcement member 23B is inserted inside the formwork member 26A from the opening 260 of the formwork member 26A so that the axial direction of the reinforcement member 23B is parallel to the axial direction of the first reinforcing bar 21 . In addition, when the second reinforcing bar end 310 is inserted inside the reinforcing member 23B from the opening 230 of the reinforcing member 23B, the reinforcing member 23B is configured such that the first reinforcing bar end 210 and the second reinforcing bar end 310 are separated from each other. is disposed inside the formwork member 26A so as to surround the overlapped portion of the reinforcing member 23B along the axial direction.

Note that the reinforcing member 23B may have a communicating portion 234 that communicates the inner side and the outer side of the reinforcing member 23B. Instead of the spiral bar, for example, the reinforcing bar may be formed in a mesh shape. good. Further, the reinforcing member 23B may be inserted inside the formwork member 26 at the factory after concrete curing, or may be inserted inside the formwork member 26 at the construction site.

The hardening agent 4 is filled inside the formwork member 26A, and the second reinforcing bar end 310 is inserted into the reinforcing member 23A from the opening 230 of the reinforcing member 23B, so that the first reinforcing bar end 210 and the first reinforcing bar end 310 are inserted into the reinforcing member 23A. 2 are overlapped along the axial direction of the reinforcing member 23B.

(Modification of the third embodiment)
FIG. 10 shows a joint structure of concrete members according to a modification of the third embodiment of the present invention, where (a) is an enlarged longitudinal sectional view and (b) is a sectional view taken along the line XX. In the modification of the third embodiment, the formwork member 26B is arranged inside the reinforcing member 23C with respect to the third embodiment.

The formwork member 26B is composed of, for example, a sheath tube or the like, and has an opening 260 on the first joint surface 20 . The formwork member 26B functions as a formwork for forming the recess 22 by being arranged at a position where the recess 22 is to be formed when the first concrete member 2 is placed at the factory. Also, the first reinforcing bar 21 is embedded in the first concrete member 2 so that the first reinforcing bar end 210 protrudes inside the formwork member 26B.

The reinforcing member 23C is made of spiral reinforcement, and when the first concrete member 2 is cast at a factory, the formwork member 26B is arranged at the position where the recess 22 is to be formed, and the formwork member 26B By arranging a reinforcing member 23C on the outside of the form member 26B so as to surround the outer periphery of the recess 22, it is embedded in the concrete portion forming the recess 22. As shown in FIG. Note that the reinforcing member 23C may have a communicating portion 234 that communicates the inner side and the outer side of the reinforcing member 23B. Instead of the spiral bar, for example, the reinforcing bar may be formed in a mesh shape. good.

The hardener 4 is filled inside the formwork member 26B, and the second rebar end 310 is inserted into the formwork member 26B from the opening 260 of the formwork member 26B, and the first rebar end 210 is inserted into the formwork member 26B. and the second reinforcing bar end 310 are hardened in a state in which they overlap along the axial direction of the reinforcing member 23C.

As described above, according to the joint structure of concrete members and the concrete structure 1 according to the third embodiment, the first reinforcing bar end portion 210 and the second reinforcing bar end portion 310 are the axes of the reinforcing members 23B and 23C. The first reinforcing bar end 210 and the second reinforcing bar end 310 are overlapped along the direction, and the overlapping portion where the first reinforcing bar end 210 and the second reinforcing bar end 310 are overlapped is surrounded by the reinforcing members 23B and 23C, and the reinforcing members 23B and 23C are outside or inside the reinforcing members 23B and 23C. The hardening agent 4 is filled inside the formwork members 26A and 26B arranged in the above and hardened.

Therefore, when a force in the tensile direction acts along the axial direction of the first reinforcing bar 21 and the second reinforcing bar 31, the first reinforcing bar end 210 and the second reinforcing bar end 310 are separated from each other by the reinforcing members 23B and 23C. , the transmission of force in tension between the first rebar end 210 and the second rebar end 310 is achieved without passing through the reinforcing members 23B, 23C. Directly between the first rebar end 210 and the second rebar end 310 via the agent 4 . At this time, a force acts on the curing agent 4 so as to expand it radially outward of the reinforcing members 23B and 23C, but the curing agent 4 is restrained by being surrounded by the reinforcing members 23B and 23C. Therefore, the expansion of the hardening agent 4 is suppressed, and the occurrence of cracks in the hardening agent 4 can be reduced. can be Therefore, it is possible to secure the strength against the force in the tensile direction acting along the axial direction of the reinforcing bars without using high-performance and expensive exclusive products as the reinforcing members 23B and 23C.

In addition, for example, even if a large force acts on the first and second concrete members 2 and 3 due to an earthquake or the like and the concrete outside the reinforcing members 23B and 23C is destroyed, Since the hardening agent 4 is protected by being surrounded by the reinforcing members 23B and 23C, it is possible to prevent the hardening agent 4 from being destroyed. Since the joint of the two reinforcing bars 31 can be maintained, it can be used in a part that receives a large force.

(Fourth embodiment)
FIG. 11 shows a joint structure of concrete members according to a modification of the fourth embodiment of the present invention, where (a) is an enlarged longitudinal sectional view and (b) is a sectional view taken along line XI-XI.

The joint structure of concrete members according to the fourth embodiment is different from the joint structure of concrete members according to the first embodiment in that the first concrete member 2 is laterally moved from the side surface of the first concrete member 2. The reinforcing member 23A further includes an injection passage 24 and a discharge passage 25 that extend and communicate with the inside of the reinforcing member 23A. and further.

The inlet 232 is arranged below the reinforcing member 23A, and the outlet 233 is arranged above the reinforcing member 23A.

The hardening agent 4 is injected from the outside of the first concrete member 2 into the reinforcing member 23A through the injection passage 24 and the injection port 232, and is injected into the outside of the first concrete member 2 through the discharge passage 25 and the injection port 232. , the inside of the reinforcing member 23A is filled.

Next, a method for joining concrete members according to the fourth embodiment will be described. 12A and 12B are vertical cross-sectional views showing steps in a method for joining concrete members according to a fourth embodiment of the present invention, where (a) shows the first step and (b) shows the second step. is. 13A and 13B are vertical cross-sectional views showing steps in a method for joining concrete members according to a fourth embodiment of the present invention, where (a) shows the third step and (b) shows the fourth step. is.

First, in the first step shown in FIG. 12(a), a first concrete member 2 prefabricated in a factory is arranged at a predetermined position by a crane or the like at the construction site of the concrete structure 1. . At this time, each of the recesses 22 is provided with a reinforcing member 23A.

Next, in the second step shown in FIG. 12(b), the second concrete member 3 prefabricated at the factory is placed so that the first joint surface 20 and the second joint surface 30 face each other. It is disposed above the first concrete member 2 by a crane or the like. At this time, the second reinforcing bar end 310 is inserted inside the reinforcing member 23A from the opening 230, and the first reinforcing bar end 210 and the second reinforcing bar end 310 are aligned in the axial direction of the reinforcing member 23A. It is arranged in an overlapping state along the line.

Next, in the third step shown in FIG. 13(a), the hardening agent 4 is injected from the outside of the first concrete member 2 into the reinforcing member 23A through the injection passage 24 and the injection port 232, and the discharge passage. 25 and the injection port 232 to the outside of the first concrete member 2 to fill the inside of the reinforcing member 23A. In FIG. 13A, the injection passage 24 and the discharge passage 25 are connected only to the left reinforcing member 23A, but may be connected to other reinforcing members 23A, or may be connected to adjacent reinforcing members. A relay passage connecting between 23A may be formed.

Next, in a fourth step shown in FIG. 13(b), the curing agent 4 is cured over a predetermined period of time, thereby joining the first concrete member 2 and the second concrete member 3 together. be.

In this way, the second concrete member 3 is joined to the upper side of the first concrete member 2, and another concrete member is successively joined to the upper side of the second concrete member 3 by the same joining method. , a concrete structure 1 is constructed.

(Other embodiments)
As described above, the first to fourth embodiments have been described as one embodiment of the present invention, but the present invention is not limited to the above embodiments, and is within the scope of the technical idea of the present invention. can be changed as appropriate.

For example, the first to fourth embodiments may be combined arbitrarily. The projections 211 and 311 according to the form may be added, or the projections 211 and 311 according to the second embodiment may be added to the concrete member joint structure according to the third embodiment. good too.

In addition, in the concrete member joint structure according to the third embodiment, as in the first modification of the first embodiment, a plurality of first reinforcing bar ends 210 and a plurality of first reinforcing bar ends 210 and A plurality of second rebar ends 310 may be provided.

Furthermore, by adding the injection passage 24 and the discharge passage 25 according to the fourth embodiment to the concrete member joint structure according to the third embodiment, the concrete member joint structure according to the third embodiment can: The method of joining concrete members shown in FIGS. 12-13 may also be used. In that case, the mold members 26A and 26B may be provided with an inlet connected to the inlet passage 24 and an outlet connected to the outlet passage 25.

1 ... concrete structure,
2 ... the first concrete member,
3 ... the second concrete member,
4 ... curing agent,
20... First joint surface, 21... First reinforcing bar, 22... Concave part,
23A, 23B, 23C... reinforcing members,
24... injection passage, 25... discharge passage,
26A, 26B... form members,
30 ... second joint surface, 31, 31A, 31B ... second reinforcing bar,
210 ... first reinforcing bar end, 211 ... protrusion,
230 ... opening, 231 ... bottom,
232... inlet, 233... outlet,
234 ... communicating portion, 260 ... opening,
310, 310A, 310B... second rebar ends,
311... Protrusion

Claims (6)

A joint structure of concrete members in which a first joint surface of a first concrete member and a second joint surface of a second concrete member are opposed to each other and joined with a curing agent,
The first concrete member includes a hollow reinforcing member disposed on the first joint surface side and having an opening in the first joint surface, and an end portion protruding inside the reinforcing member. and a plurality of first reinforcing bars embedded in the first concrete member,
The second concrete member includes a plurality of second reinforcing bars embedded in the second concrete member such that the ends protrude from the second joint surface,
The hardening agent is filled inside the reinforcing member, the ends of the plurality of second reinforcing bars are inserted into the reinforcing member through the openings, and the ends of the plurality of first reinforcing bars are inserted into the reinforcing member. and the end portions of the plurality of second reinforcing bars overlapped along the axial direction of the reinforcing member , and the end portions of the plurality of first reinforcing bars and the end portions of the plurality of second reinforcing bars It is cured in a state where it is arranged on the same circumference inside the reinforcing member so that the ends and the reinforcing member are staggered in the circumferential direction of the reinforcing member ,
A joint structure of concrete members characterized by: The first concrete member is
a hollow formwork member disposed on the first joint surface side and outside the reinforcing member so as to surround the outer periphery of the reinforcing member and having an opening in the first joint surface; further prepared,
The curing agent is filled inside the formwork member, the end portions of the plurality of second reinforcing bars are inserted into the reinforcing member from the openings of the reinforcing member, and the plurality of first reinforcing members are filled with the curing agent. and the end portions of the plurality of second reinforcing bars overlap along the axial direction , and the end portions of the plurality of first reinforcing bars and the plurality of second reinforcing bars Cured while being arranged on the same circumference inside the reinforcing member so that the ends of the reinforcing bars are alternated in the circumferential direction of the reinforcing member ,
The joining structure of concrete members according to claim 1, characterized in that: The first concrete member is
Further comprising a hollow formwork member disposed on the first joint surface side and inside the reinforcing member and having an opening in the first joint surface,
The reinforcing member is embedded in the first concrete member so as to surround the outer periphery of the formwork member,
The plurality of first reinforcing bars are embedded in the first concrete member so that ends protrude inside the form member,
The curing agent is filled inside the formwork member, the ends of the plurality of second reinforcing bars are inserted into the formwork member from the openings of the formwork member, and the plurality of The end portion of the first reinforcing bar and the end portion of the plurality of second reinforcing bars are overlapped along the axial direction, and the end portion of the plurality of first reinforcing bars and the plurality of second reinforcing bars are overlapped along the axial direction . Cured in a state where it is arranged on the same circumference inside the formwork member so that the ends of the reinforcing bars of 2 are alternately arranged in the circumferential direction of the reinforcing member ,
The joining structure of concrete members according to claim 1, characterized in that: The ends of the plurality of first reinforcing bars or the ends of the plurality of second reinforcing bars have different lengths in the axial direction,
The joining structure of concrete members according to any one of claims 1 to 3 , characterized in that: The first reinforcing bar or the second reinforcing bar has one or more flange-like projections formed at the end,
The joining structure of concrete members according to any one of claims 1 to 4 , characterized in that: A plurality of concrete members are joined by the joining structure for concrete members according to any one of claims 1 to 5 ,
A concrete structure characterized by:

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