JP7210237B2 - Concrete member connection structure and precast concrete member connection method - Google Patents

Description

The present invention provides, for example, a reinforcing bar connecting joint used for connecting precast concrete members to each other or a precast concrete member and another concrete member, a reinforcing bar connecting joint structure configured using the reinforcing bar connecting joint, and The present invention relates to a method for connecting precast concrete members using the joint for connecting reinforcing bars.

In modern cities, when constructing structures such as buildings and various underground structures, concrete members that have been manufactured in advance at a factory or the like are brought to the site, and the method is to combine the members or assemble them to the existing members. Techniques for constructing pillars and beams by such methods are known. Such prefabricated concrete members are referred to as "precast concrete members" or "precast members". This precast member is manufactured, for example, in a configuration in which reinforcing bars are protruded for connecting the precast member and other members.

As an example of a construction method using precast concrete members, for example, Patent Document 1 discloses a joint structure that can connect precast members and existing members without being affected by construction errors or manufacturing errors. is disclosed. Further, for example, Patent Literature 2 discloses a joint structure that reduces the distance between a precast member and another concrete member and reduces the labor for construction.

JP 2010-65417 A JP 2017-190629 A

The technique described in Patent Document 1 is a technique related to joining between a precast member and an existing member, in which a concave portion is formed at the member joint end, and the reinforcing bar (main bar) end of each member is placed in the box inside the concave portion. The parts are arranged facing each other and connected by interposing an adhesive in that state. In addition, the technique described in Patent Document 2 is a technique related to joining between a precast member and another concrete member. The main reinforcing bars are arranged in a state of facing each other, and are connected by filling the filler material in that state.

However, in Patent Document 1, a concave portion is formed and a configuration is adopted in which a pair of reinforcing bar tip portions are accommodated inside the box. Since it is configured to accommodate a pair of rebar tips inside, there is a concern that the construction will be complicated, and there is room for further efficiency improvement. In particular, the techniques of Patent Documents 1 and 2 are configured to join opposing reinforcing bars (main bars) one by one (one pair). For example, when joining a plurality of pairs of reinforcing bars facing each other No mention is made of construction efficiency. When assembling members using precast members in modern structures, there are many configurations in which multiple pairs of reinforcing bars are attached to the precast members, and these multiple pairs of reinforcing bars are opposed and joined between members. In some cases, the stabilization of joints and the further efficiency of construction are required.

In view of the above circumstances, an object of the present invention is to enable efficient joining of rebars of precast concrete members, and in particular, to efficiently join the tips of a plurality of pairs of opposing rebars together. To provide a connecting structure of concrete members and a method of connecting precast concrete members.

In order to achieve the above object, according to the present invention, there is provided a connection structure for connecting a pair of concrete members via a reinforcing bar and a reinforcing bar joint, wherein the reinforcing bar joint is two pieces arranged side by side with a space therebetween. 2, which has a flange member and a web member that connects the two flange members, and is a space surrounded on three sides by the two flange members and the web member between the two flange members; One of the reinforcing bar accommodating portions accommodates one or a plurality of reinforcing bars protruding from one of the concrete members, and the other reinforcing bar accommodating portion accommodates one protruding from the other concrete member. Alternatively, a plurality of reinforcing bars are accommodated, a hardening material is filled in a gap between the pair of concrete members including the reinforcing bar accommodating portion, and the reinforcing bars and the reinforcing bar joint are entirely buried. is provided .

The two flange members and the web member are flat steel plates, and the web member is provided so as to connect the flange members near the central portion in the flange width direction of the two flange members, and has a cross-sectional shape. It may be substantially H-shaped.

The two flange members may be shaped steel having a substantially L-shaped cross section, and the web member may be provided so as to connect the bent portions of the two flange members.

The flange member may be provided with a projecting member projecting in the direction of the reinforcing bar accommodating portion at an end portion in the flange width direction of the flange member.

A penetrating plate may be arranged in each of the two reinforcing-bar accommodating portions for allowing the reinforcing bars to penetrate through the through-holes when the reinforcing bars are accommodated.

Further, according to the present invention, there is provided a method for connecting precast concrete members for connecting precast concrete members to each other or connecting a precast concrete member to another concrete member using the connecting structure for concrete members described above, the method comprising: A member and another concrete member are manufactured in a state in which a reinforcing bar for connection is protruding, the precast concrete member and the other concrete member are arranged at a predetermined position to be connected, and the reinforcing bar is placed in the reinforcing bar accommodation part. arranging a reinforcing bar connection joint so as to be accommodated therein, and filling a hardening material in the reinforcing bar accommodating portion and the gap between the precast concrete members or between the precast concrete member and another concrete member; A method for connecting precast concrete members is provided, characterized by:

ADVANTAGE OF THE INVENTION According to the present invention, it is possible to efficiently join reinforcing bars of a precast concrete member to each other, and in particular, a concrete member capable of efficiently joining the tip portions of a plurality of pairs of opposing reinforcing bars together. A connection structure and method for connecting precast concrete members are provided.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic explanatory drawing of the joint structure for reinforcing-bar connection which concerns on 1st Embodiment. BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic sectional drawing of the joint structure for reinforcement connection which concerns on 1st Embodiment. BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic sectional drawing of the joint structure for reinforcement connection which concerns on 1st Embodiment. It is a schematic sectional drawing of the joint structure for reinforcement connection which concerns on 2nd Embodiment. It is a schematic sectional drawing of the joint structure for reinforcement connection which concerns on 3rd Embodiment. FIG. 2 is a schematic diagram of a penetrating plate; It is a schematic sectional drawing of the joint structure for reinforcement connection which concerns on the modification of this invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the present specification and drawings, constituent elements having substantially the same functional configuration may be denoted by the same reference numerals, thereby omitting redundant description.

(Reinforcing bar connection joint structure according to the first embodiment of the present invention)
FIG. 1 is a schematic explanatory diagram of a reinforcing bar connection joint structure 1 according to a first embodiment of the present invention. In FIG. 1, the precast concrete member is not shown for the sake of simplification, and the state in which a plurality of reinforcing bars protruding from the precast concrete member face each other is shown by focusing on the tip portions of the reinforcing bars. Also, as an example of the number of pairs of reinforcing bars facing each other, a state in which three reinforcing bars are butted against each other is shown.

As shown in FIG. 1 , in the reinforcing bar connection joint structure 1 , a plurality of pairs of reinforcing bars facing each other, that is, one reinforcing bar 3 and the other reinforcing bar 4 are connected to each other by connecting the tips 3 a and 4 a of the reinforcing bars 3 and 4 together. placed in abutted state. The tip portions 3a and 4a are separated by a predetermined distance, and a reinforcing bar connecting joint (hereinafter also simply referred to as a joint member) 10 is arranged between one reinforcing bar 3 and the other reinforcing bar 4.

The joint member 10 is a long member having a substantially H-shaped cross section, and includes flange members 12 (12a, 12b), which are two flat steel plates arranged parallel to each other with a space therebetween, and the flange members 12a. , 12b. The web member 15 is provided so as to connect the two flange members 12a and 12b, for example, in the vicinity of the central portion in the flange width direction. As a result, the space between the two flange members 12a and 12b is divided by the web member 15 and partitioned into two spaces having substantially groove-shaped cross sections. The space (groove space) with a substantially groove-shaped cross section surrounded on three sides by the two flange members 12a and 12b and the web member 15 accommodates the tips 3a and 4a of the reinforcing bars 3 and 4 as shown in the figure. , and the space functions as a pair of reinforcing bar housing portions 20a, 20b (20).

Moreover, FIG. 2 is a schematic cross-sectional view of the joint structure 1 for connecting reinforcing bars, and is a schematic view showing the joint structure in a configuration in which the reinforcing bars protrude from the precast member. FIG. 3 is a schematic cross-sectional view of the joint structure 1 for connecting reinforcing bars, and is a schematic view showing a joint structure in which a recess is formed in the precast member and the reinforcing bar protrudes in the recess.
It should be noted that the precast member shown in the figure is generally manufactured in a state in which reinforcing bars for connection are protruded from the outside of the member in advance.

In the configuration shown in FIG. 2, a pair of (upper and lower in the figure) precast members 30 (30a, 30b) are arranged at predetermined positions, and the tip portions 3a, 4a of the reinforcing bars 3, 4 protruding from the ends thereof are The joint member 10 is arranged so as to be accommodated in the reinforcing bar accommodation portions 20a and 20b. When the precast members 30a and 30b are assembled, the inner space of the reinforcing bar accommodating portions 20a and 20b and their surroundings are filled with a hardening material B as shown. At the time of filling the hardening material B, for example, the formwork 32 (broken line portion in the figure) is temporarily placed to create a closed space, and the hardening material B is injected into the internal space of the formwork 32 . will be The hardening material B may be any fluid material that hardens over time, and examples thereof include grout, cement, and mortar.

In the configuration shown in FIG. 3, precast members 40 (40a, 40b) having a pair of recesses (upper and lower in the figure) are arranged at predetermined positions, and the reinforcing bars 3 and 4 are placed in opposing recesses. Protruding. By facing the recesses of the precast members 40a and 40b, a space U is formed by the recesses as a gap between the members. A joint member 10 is arranged to be accommodated. When assembling the precast members 40a and 40b, the reinforcing bar accommodating portions 20a and 20b and the space U are filled with a hardening material B as shown.

According to the reinforcing-bar connecting joint structure 1 described with reference to FIGS. Efficient bonding is realized by performing bonding in the housed state. In particular, as shown in FIG. 1, a plurality of pairs of reinforcing bars 3 and 4 are collectively housed in the reinforcing bar housing portions 20a and 20b, and the hardening material B is filled therein. The pair of reinforcing bars 3 and 4 can be jointed collectively, and the stabilization of joint and efficiency improvement of construction are realized.

(Reinforcing bar connection joint structure according to the second embodiment of the present invention)
FIG. 4 is a schematic cross-sectional view of a reinforcing bar connection joint structure 1a according to a second embodiment of the present invention, which schematically shows a joint structure in which a recess is formed in a precast member and a reinforcing bar protrudes in the recess. It is a diagram. In addition, in FIG. 4, constituent elements having the same function and configuration as those of the reinforcing-bar connection joint structure 1 described in the first embodiment are indicated by the same reference numerals, and description thereof may be omitted.

As shown in FIG. 4, in the reinforcing-bar connecting joint structure 1a, two flange members 12a and 12b are provided at both ends in the width direction of the flange in the direction of the reinforcing-bar accommodating portions 20a and 20b (the inner side of the substantially H-shaped cross section). direction) is provided. According to the configuration including the projecting member 50, in addition to the effects described in the first embodiment, after the hardening material B is hardened, an external force, such as the reinforcing bars 3 and 4, is moved away from the precast members 40a and 40b. When a force is applied, the projecting member 50 reacts to the force, so that the connection between the precast members 40a and 40b becomes stronger.

(Reinforcing bar connection joint structure according to the third embodiment of the present invention)
FIG. 5 is a schematic cross-sectional view of a reinforcing bar connection joint structure 1b according to a third embodiment of the present invention, which schematically shows a joint structure in which a recess is formed in a precast member and a reinforcing bar protrudes in the recess. It is a diagram. In addition, in FIG. 5, constituent elements having the same function and configuration as those of the reinforcing-bar connection joint structure 1 described in the first embodiment are denoted by the same reference numerals, and description thereof may be omitted.

As shown in FIG. 5, in the reinforcing bar connection joint structure 1b, plate-like members extending in the longitudinal direction of the joint member 10 are arranged inside the reinforcing bar accommodating portions 20a and 20b. This member is provided with through holes for penetrating the reinforcing bars 3 and 4, and is called a through plate 60 here. FIG. 6 is a schematic diagram of the penetrating plate 60 . As shown in FIG. 6, the penetration plate 60 is provided with one or a plurality of through holes 65 (three in FIG. 6) for the reinforcing bars 3 and 4 to pass through.

Although the number and arrangement of the through holes 65 provided in the through plate 60 are arbitrary, it is desirable to design them based on the number and positional configuration of the reinforcing bars 3 and 4 attached to the precast member 40 to be constructed. Moreover, as shown in FIG. 5, the ends of the reinforcing bars 3 and 4 may be formed with caps (retaining portions) 62 having a larger diameter than the main body of the reinforcing bars. In such a configuration, the diameter of the through hole 65 of the through plate 60 is preferably designed to be larger than the diameter of the head portion 62 .

As a construction process of the joint structure 1b for reinforcing bar connection having such a configuration including the through plate 60 shown in FIG. In this state, the joint member 10 is inserted into the space U in the longitudinal direction, and the hardening material B is filled after the insertion is completed. According to the reinforcing-bar connecting joint structure 1b configured in this way, in addition to the effects described in the first embodiment, after the hardening material B hardens, the precast members 40a and 40b are subjected to an external force such as the reinforcing bars 3 and 4. When a force is applied to separate the precast members 40a and 40b, the penetration plate 60 reacts to the force, so that the connection between the precast members 40a and 40b becomes stronger.

Although an example of the embodiment of the present invention has been described above, the present invention is not limited to the illustrated form. It is obvious that a person skilled in the art can conceive various modifications or modifications within the scope of the idea described in the claims, and these naturally belong to the technical scope of the present invention. understood as a thing.

(Modification of the present invention)
In the above embodiment, the joint member 10 is composed of the flange member 12 and the web member 15, and has a substantially H-shaped cross section. However, the shape of the joint member 10 is not limited to this. . For example, the cross-sectional shape of the two flange members may be substantially L-shaped. Modifications of the present invention will be described below with reference to the drawings.

FIG. 7 is a schematic cross-sectional view of a reinforcing bar connection joint structure 1c according to a modification of the present invention, and is a schematic view showing a joint structure in which reinforcing bars protrude from a precast member. In FIG. 7, constituent elements having the same function and configuration as those of the reinforcing-bar connection joint structure 1 described in the first embodiment are indicated by the same reference numerals, and description thereof may be omitted.

As shown in FIG. 7, the reinforcing bar joint structure 1c includes two substantially L-shaped steel flange members 70 (70a, 70b) arranged in parallel with each other and spaced apart from each other. It consists of a web member 15 which is a flat steel plate connecting 70a and 70b. The web member 15 is provided so as to connect bent portions of a flange member 70 having a substantially L-shaped cross section. As a result, the space between the two flange members 70a and 70b is separated by the web member 15 and partitioned into two spaces. The space surrounded on three sides by the two flange members 70a and 70b and the web member 15 can accommodate the tip portions 3a and 4a of the reinforcing bars 3 and 4 as shown in the drawing. It functions as the housing portions 20a and 20b (20).

According to the reinforcing-bar connection joint structure 1c configured in this manner, a shaped steel having a substantially L-shaped cross section is used as the flange member 70 (70a, 70b). Therefore, in addition to the effects described in the above embodiment, for example, when connecting the precast members 30 (30a, 30b), the positional relationship is such that the reinforcing bars 3, 4 of the two precast members 30 (30a, 30b) are perpendicular to each other. Therefore, it becomes possible to perform joining. That is, when constructing a structure such as a building, it is necessary to connect two precast members 30 (30a, 30b) in order to construct corners, curved portions, etc. of the structure. A technique for joining reinforcing bars using the joint structure 1c for connecting reinforcing bars is useful.

In this modified example, the flange member 70 (70a, 70b) has a substantially L-shaped cross-sectional shape. For example, a flange member having a curved cross-sectional shape, and a flange member having a substantially L-shaped but not bent angle of 90° are also conceivable.

In addition to the configurations described in the above embodiments and modifications, a configuration in which uneven portions are provided on the inner wall of the flange member is also conceivable. That is, in a state in which the hardening material B is hardened and the reinforcing bars 3 and 4 are connected to each other with the hardening material B interposed therebetween, a force is applied to the reinforcing bars 3 and 4 to separate the reinforcing bars 3 and 4. , when a force is applied to press the rebars 3 and 4 together, the force applied to the rebars 3 and 4 can be efficiently transmitted to the joint member 10 via the uneven portions, etc., so that the connection can be further improved. become strong.

In the above embodiments and modifications, the case of assembling (connecting and joining) precast concrete members (precast members) provided with reinforcing bars has been illustrated and explained, but the scope of application of the present invention is limited to this. not a thing That is, the present invention is naturally effective when assembling other members such as precast members and cast-in-place concrete members, and is an effective technique for efficiently connecting and joining reinforcing bars protruding from each member. .

INDUSTRIAL APPLICABILITY The present invention is applicable to a connection structure of concrete members and a connection method of precast concrete members.

DESCRIPTION OF SYMBOLS 1, 1a-1c... Joint structure for reinforcing-bar connection 3, 4... Reinforcement bar 10... Joint member 12... Flange member 15... Web member 20... Reinforcement-bar accommodating part 30... Precast member 32... Formwork 40... Precast member (having a recessed part) 50 Overhang member 60 Through plate 62 Umbrella member 65 Through hole 70 (L-shaped) flange member B Hardening material U Space

Claims (6)

A connection structure that connects a pair of concrete members via a reinforcing bar and a reinforcing bar joint,
The reinforcing bar joint is
two flange members spaced apart from each other and arranged side by side;
a web member connecting the two flange members;
Between the two flange members, two reinforcing bar accommodating portions are formed, which are spaces surrounded on three sides by the two flange members and the web member ,
One of the reinforcing bar accommodating portions accommodates one or a plurality of reinforcing bars protruding from one of the concrete members,
one or a plurality of reinforcing bars protruding from the other concrete member are accommodated in the other reinforcing bar accommodating portion;
A connecting structure of concrete members, wherein a hardening material is filled in a gap between the pair of concrete members including the reinforcing bar accommodating portion, and the reinforcing bar and the reinforcing bar joint are entirely embedded. The two flange members and the web member are flat steel plates,
The web member is provided so as to connect the two flange members in the vicinity of the central portion in the flange width direction of the two flange members,
2. The connecting structure of concrete members according to claim 1, wherein the cross-sectional shape is substantially H-shaped. The two flange members are steel having a substantially L-shaped cross section,
2. The connecting structure of concrete members according to claim 1, wherein the web member is provided so as to connect the bent portions of the two flange members. The concrete according to any one of claims 1 to 3, characterized in that the flange member is provided with an overhang member that overhangs in the direction of the reinforcing bar accommodation portion at an end portion in the flange width direction of the flange member. Linked structure of members . In each of the two reinforcing bar accommodation units,
The connection structure of concrete members according to any one of claims 1 to 4, characterized in that a through plate is arranged to allow the reinforcing bar to pass through the through hole when the reinforcing bar is accommodated. A method for connecting precast concrete members using the connecting structure for concrete members according to any one of claims 1 to 5, wherein precast concrete members are connected to each other, or precast concrete members are connected to other concrete members,
manufacturing the precast concrete member and another concrete member in a state in which reinforcing bars for connecting are protruding;
Arranging the precast concrete member and another concrete member at a predetermined position to be connected,
arranging a reinforcing bar connection joint so that the reinforcing bar is accommodated in the reinforcing bar accommodating portion;
A method for connecting precast concrete members, characterized in that a hardening material is filled in the reinforcing bar accommodating portion and the gap between the precast concrete members or between the precast concrete member and another concrete member.

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