JP4964542B2 - Joint structure of precast reinforced concrete beam members - Google Patents

Description

The present invention, precast reinforced concrete (hereinafter appropriately referred to as PCa.) Belongs to the technical field of junction structure of the beam members to each other, further referred, to and joining operation from one of the beam outer surface without horizontally moving the beam members to each other that on the structure.

  Conventionally, as shown in FIGS. 5A and 5B, the PCa beam members are joined by joining the reinforcing bars b and b projecting from the opposing PCa beam members a and a, and placing a post-cast concrete at the joint. Generally, post-construction work (not shown) is performed. Incidentally, as a method of joining (joining) the reinforcing bars b and b, a pressure welding joint method, a welded joint method, a mechanical joint method, and the like are used, and the work of joining the reinforcing bars b and b reliably is performed. From the viewpoint, it is common to secure the interval L between the PCa beam members a and a at least about 150 cm (for example, see FIG. 1 of Patent Document 1, FIG. 4 of Patent Document 2, and Patent Document 3). (See FIG. 3). 5A and 5B show an embodiment in which a plurality of column main bars c are protruded above the PCa column member e and constructed in a structural form (such as a skewering method). The symbol d in the figure indicates a support work.

  However, it is necessary to secure at least about 150 cm between the conventional PCa beam members a and a. Therefore, after the joint work between the reinforcing bars b and b is completed, a concrete casting mold is installed in the vicinity of the joint between the opposing PCa beam members a and a so as to fill the gap L between the beam members a and a. However, it is necessary to perform a large-scale post-construction work in which concrete is placed to integrate the joint portions of the reinforcing bars b and b with the PCa beam members a and a. Therefore, there is a problem that the construction period is prolonged and too uneconomical.

  By the way, FIG. 6 has shown the joining method from which PCa beam members a and a differ. In this technique, a sleeve joint f is embedded horizontally in one (left side in the illustrated example) PCa beam member a, and a reinforcing bar b is projected horizontally in the other (right side in the illustrated example) PCa beam member a. Then, the other PCa beam member a is moved in the horizontal direction (left direction in the illustrated example), inserted into the sleeve joint f, filled with grout in the joint portion, and the PCa beam members a, a A joining operation is performed (see, for example, FIG. 3 of Patent Document 4).

  In the joining method of FIG. 6, the PCa beam members a and a can be joined to each other by an operation of filling the joint portion (gap) with a grout with almost no space between the PCa beam members a and a. Large-scale post-work such as placing concrete formwork in the vicinity of the joint between the PCa beam members a and a and placing concrete is unnecessary. Therefore, as compared with the technique according to FIGS. 5A and 5B, the post-construction can be simplified and the construction period can be shortened, which seems to be excellent in economy.

JP-A-3-212537 JP-A-5-340003 JP-A-5-86643 Japanese Patent Application Laid-Open No. 2004-346587

  It is recognized that the technique according to FIG. 6 (for example, Patent Document 4) can simplify the post-construction and shorten the construction compared to FIGS. 5A and 5B. However, it is a structural type (reverse skewering method, reverse insertion column, etc.) in which a plurality of column main bars c protrude below the PCa column member e, which can allow the horizontal movement of the PCa beam member a. That's why.

That is, as shown in FIGS. 5A and 5B, the horizontal movement of the PCa beam member a is constrained for the structure type in which a plurality of column main bars c protrude above the PCa column member e. The technique of horizontally moving the PCa beam member cannot be applied at all, and it is still necessary to perform a large-scale post-work, and the problem that the construction period is prolonged and too uneconomical cannot be solved.
In FIG. 6, the PCa beam member on the left side of the drawing is first positioned, and then the PCa beam member on the right side of the drawing is positioned. Or since it joins by the method of positioning the left PCa beam member for the first time from the right, it is greatly restricted by the construction sequence, which is also a cause of the lengthening of the construction period.

  By the way, when joining so-called reverse beam members for constructing a veranda or the like, there is a problem in that it is necessary to install a scaffolding or surface finishing after joining, which affects the construction period.

The object of the present invention can be suitably implemented in any structural form in which a plurality of column main bars c protrude below or above the PCa column member e, and the PCa beam is used to join the PCa beam members a and a together. without the member is horizontally moved, it is possible to dramatically simplify the construction after extensive, to achieve shortening of the construction period, excellent economic efficiency, to provide a junction structure of a precast reinforced concrete beam members to each other is there.

The next object of the present invention can be suitably applied to the joining of reverse beam members such as a veranda, and the work on the construction floor is rationalized by performing the joining work from the front side (the veranda side) of the beam member. It is to provide a junction structure of a precast reinforced concrete beam members together with improved work efficiency by eliminating any troublesome fastening operation and joint work, etc..

As a means for solving the problems of the background art described above, the joint structure between precast reinforced concrete beam members according to the invention described in claim 1 is:
In the joint structure between precast reinforced concrete beam members,
The beam member has a recess formed in the front center portion of the end portion to be joined, and a beam line horizontally traversing the recess is exposed in the vertical direction to a position near the tip of the plurality of beam members. The ends of the two precast reinforced concrete beam members are positioned relative to each other and aligned,
Connecting members straddling the recesses of the beam members are respectively inserted between the plurality of exposed beam bars;
The connecting member is an S-shaped reinforcing bar, an oval reinforcing bar, or a reinforcing bar having a combination of an S-shaped reinforcing bar and an oval reinforcing bar. , The upper side and the lower side are inserted in a symmetrical arrangement when viewed in plan, and an oval reinforcing bar is inserted in the middle position ,
The hardened material is injected, filled, and fixed to the concave portion, and the precast reinforced concrete beam members are joined to each other.

The invention according to claim 2 is a joint structure between precast reinforced concrete beam members according to claim 1 ,
The connecting member to be inserted between the plurality of protruding beam bars is characterized in that an S-shaped reinforcing bar is integrally formed in a comb shape with an elliptical reinforcing bar at an intermediate position and an elliptical reinforcing bar at an uppermost position and a lowermost position, respectively.

According to a third aspect of the invention, in the bonding method and bonding structure of the precast reinforced concrete beam members to each other according to claim 1 or 2,
The hardener is concrete, grout, epoxy resin or the like.

According to junction structure of precast reinforced concrete beam members to each other according to the invention described in claim 1 to 3,
A recess is formed in the front center of the joint end of the precast reinforced concrete beam member, and a plurality of beam bars crossing the inside of the recess in the horizontal direction are exposed in the vertical direction, and connecting members are inserted between the beam bars. is, since the structure of grout into the recess are bonded are injected filled, can join the PCa beam members together without horizontally moving the PCa beam member, projecting a plurality of pillar main reinforcement beneath or above the PCa columns Any structural form can be suitably implemented. Also, PCa has excellent economic efficiency by dramatically shortening the work period by drastically simplifying large-scale post-work such as placing concrete in the vicinity of previous joints and placing concrete. A method of joining beam members can be realized.

In addition, since the joining work is performed from the front position of the PCa beam member, the joining work can be performed only from the veranda side (one beam outer surface) in the reverse beam member such as the veranda, so that the efficiency is not required without installing the scaffold. Since the finishing of the other side wall surface (outer wall surface) of the PCa beam member can be completed at the time of manufacturing the PCa beam member, the work on the construction floor can be remarkably streamlined.
In addition, the S-shaped reinforcing bar and the oval reinforcing bar are merely fitted and grout filled, so that it is possible to simplify the fastening work and the joint work that each member takes time and to significantly improve the work efficiency. .

According to the second aspect of the present invention, since the connecting member is formed by integrally forming the S-shaped reinforcing bar or the oval reinforcing bar in a comb shape, the fitting operation becomes very simple and the working efficiency is remarkably improved.

In the present invention, a precast reinforced concrete beam member 1 or 2 (referred to as a PCa beam member) has a recess 3 formed in the center of the front face F of the end to be joined, and the beam crossing the recess 3 in the horizontal direction. The ends of the two PCa beam members 1 and 2 having a configuration in which a plurality of the bars 4 are exposed in the vertical direction are positioned relative to each other in a state where the ends of the PCa beam members 1 and 2 face each other.
Connecting members 5 straddling the concave portions 3 of both beam members 1 and 2 are respectively inserted between the plurality of exposed beam bars 4.
A hardened material such as concrete or grout is injected and filled into the recess 3 to join the precast reinforced concrete beam members.

The Example of the joining structure of the precast reinforced concrete beam members based on this invention described in Claim 1 is demonstrated based on FIGS.
This joining structure is preferably implemented in a reverse beam member such as a veranda. Especially when adjacent PCa beam members are joined, the PCa beam member does not move in the horizontal direction and one beam outer surface is used. It is characterized by smoothing the joining work.

  As shown in FIGS. 1A, 1B, and 1C, the PCa beam members 1 and 2 that are continuously joined in the horizontal direction of the present invention, as shown in FIGS. A recess 3 is formed with the other side B left. The recess 3 is formed at a level that is continuous when the two PCa beam members 1 and 2 are connected.

Further, a plurality of beam bars 4... Traversing in the horizontal direction are exposed in the concave portion 3 in the vertical direction. The front end of the beam 4 is U-shaped like a reinforcing bar (main bar) embedded in the upper and lower ends shown in FIG. 1A. Furthermore, although illustration is omitted, it is preferable to provide a cotter recess on the side peripheral surface of the recess 3.
The reinforcing bars (main bars) embedded in the uppermost end and the lowermost end of the PCa beam members 1 and 2 do not necessarily have the U-shape in the illustrated example. It is added that it is set as the structure which attached the plate nut to the front-end | tip of the two main muscles.
Further, in the illustrated example, four beam bars 4 are exposed in the vertical direction, but the present invention is not limited to this and is appropriately changed according to the height of the beam member.

The PCa beam members 1 and 2 configured as described above are positioned so as to face each other with a crane or the like so as to face each other. And the connecting member 5 which straddles the said recessed part 3 of both the beam members 1 and 2 is each inserted between the said several protruding beam bars 4 ....
The connecting member 5 is specifically composed of an S-shaped reinforcing bar 50 shown in FIG. 3A and specifically an oval reinforcing bar 51 shown in FIG. 3B. Both have the substantially same length width and curved shape.

The S-shaped reinforcing bars 50 are arranged so as to be inserted into the uppermost and lowermost positions (see FIG. 2B) of the plurality of exposed beam bars 4. At that time, the S-shaped reinforcing bars 50 and 50 are inserted so that the upper side and the lower side are symmetrical when viewed in plan. That is, as shown to FIG. 2A, it is the structure arrange | positioned so that the oblique line of the S-shaped rebar 50 may cross | intersect so that it may become X shape when it sees on a plane. Thus, the X-shaped intersection contributes to the shear reinforcement of the beam members 1 and 2.
A plurality of the oval reinforcing bars 51 are inserted in the middle position of the beam bars 4. At this time, it is preferable that the beam bars 4... And the both reinforcing bars 50 and 51 be fixed with a number wire (not shown). The significance of arranging the oval reinforcing bar 51 at the intermediate position is to resist bending moments that are concentrated at the intermediate position of the beam members 1 and 2.
As described above, since the S-shaped reinforcing bar 50 is arranged at the vertical position and the oval reinforcing bar 51 is arranged at the central position, an effect of improving the shearing force of the beam members 1 and 2 and resisting the bending moment can be expected. .

  After being configured as described above, the concave portions 3 of the PCa beam members 1 and 2 are filled with a hardening material such as concrete, grout, or epoxy resin, and without moving the opposing PCa beam members 1 and 2 horizontally and It can be joined from the front (veranda side) F. Further, it is possible to simplify the fastening work and the joint work that require much labor between the members, thereby significantly improving the work efficiency.

Next , a method for joining the precast reinforced concrete beam members according to the invention of Example 1 will be briefly described.
In the PCa beam members 1 and 2, a concave portion 3 is formed in the front F central portion of the end portion to be joined, and a plurality of beam streaks 4 crossing the concave portion 3 in the horizontal direction are exposed in the vertical direction (FIGS. 1A and 1B). , C).
Then, after positioning the ends of the PCa beam members 1 and 2 relative to each other with a crane or the like, the connecting members 5 straddling the concave portions 3 of the beam members 1 and 2 are exposed to the plurality of exposed beam bars. Insert between 4 each. The connecting member 5 is composed of an S-shaped reinforcing bar 50 and an oval reinforcing bar 51, and the S-shaped reinforcing bar 50 is inserted into the uppermost position or the lowermost position, and the oval reinforcing bar 51 is inserted in the middle position in order (FIG. 2, FIG. FIG. 3). Thereafter, the hardened material is injected and filled into the concave portion 3 and fixed to join the PCa beam members 1 and 2 together.

  The present invention is not limited to the above, and although illustration is omitted, as a connecting member 5 to be inserted between a plurality of exposed beam bars 4, the S-shaped reinforcing bar is at the top and the bottom, and the oval bar is at the center. It is also possible to suitably use a structure that is integrally formed in a comb shape at each position. In this case, the troublesome work of fitting the S-shaped reinforcing bar 50 and the oval reinforcing bar 51 one by one into the beam bar 4 with limited space is reduced, the working efficiency is further improved, and the strength of the reinforcing bar is increased. Can do. The joining method is as described above.

  Further, the connecting member 5 can be implemented by a configuration consisting of only the S-shaped reinforcing bar 50 or a structure consisting of only the oval reinforcing bar 51. In addition, as shown in FIG. 3C, it is conceivable to use a reinforcing bar having a shape in which an S-shaped reinforcing bar 50 and an oval reinforcing bar 51 are combined. It is also possible to use the reinforcing bar of FIG.

In the first embodiment, the connecting member 5 is composed of various shapes of reinforcing bars, but is not limited thereto. For example, it can also be implemented as a plate material shown in FIGS.
4A to 4D are a perspective view and a cross-sectional view taken along the arrows I-I, mainly showing examples of the shape of the plate material having the unevenness on the surface. In particular, FIG. 4B-2 shows a cross-sectional view taken along the line I-I of FIG. 4B-1, and FIG. 4B-3 shows that the cross-sectional view taken along the line I-I may be a plate material having a different shape. Show. The same applies to FIGS. 4C and 4D. This convex part resists the shearing force and resists bending at the surface.
Next, FIGS. 4E to 4G show examples of the shape of the plate material having openings on the surface. The opening is provided in a shape such as a triangle, an oval, or a circle as illustrated.
As the arrangement method and structure of the two types of plates, the plate material (FIGS. 4A to 4D) provided with unevenness is provided at the top and the bottom, and the plate material (FIG. 4A-D) provided with an opening at an intermediate position. 4E to G) are preferably arranged and integrally formed.

  Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments and can be implemented in various forms without departing from the gist of the present invention. For example, although FIG. 1 is represented as a front view, it can also be implemented as a plan view. That is, the same can be applied to the joining of beam members having a low height and a large thickness. At that time, the work starts from the top.

A is a top view which shows the state which face-matched the precast reinforced concrete beam members which face each other. B is a front view of A. FIG. C is a cross-sectional view taken along line II of FIG. A is a plan view showing a state in which precast reinforced concrete beam members facing each other are butted together and an S-shaped reinforcing bar and an oval reinforcing bar are fitted. B is a front view of A. FIG. C is a cross-sectional view taken along line II of FIG. A is a reference view showing an example of an S-shaped reinforcing bar. B is a reference diagram showing an example of an oval reinforcing bar. C to E are reference diagrams showing reinforcing bars having other shapes. A-1 is the perspective view which showed one Example at the time of making the member for connection into the plate material which provided the unevenness | corrugation in the surface. A-2 shows a cross-sectional view taken along line II of A-1. B-1 is the perspective view which showed the other Example at the time of making the connection member into the plate material which provided the unevenness | corrugation on the surface. B-2 shows a cross-sectional view taken along line II of B-1. B-3 showed the case where it was set as the other arrow cross-sectional shape. C-1 is the perspective view which showed the other Example at the time of making the connection member into the plate material which provided the unevenness | corrugation in the surface. C-2 shows a cross-sectional view taken along line II of C-1. C-3 showed the case where it was set as the other arrow cross-sectional shape. D-1 is the perspective view which showed the other Example at the time of making the connection member into the plate material which provided the unevenness | corrugation in the surface. D-2 shows a cross-sectional view taken along line II of D-1. D-3 showed the case where it was set as the other arrow cross-sectional shape. It is a reference figure showing one example at the time of making a connecting member into a plate material which has an opening. It is the reference figure which showed the other Example at the time of making the member for a connection into the plate material which has an opening part. It is the reference figure which showed the other Example at the time of making the member for a connection into the plate material which has an opening part. A and B are reference views showing an outline of a conventional joining method. A is a reference view showing an outline of a conventional joining method.

Explanation of symbols

1, 2 Precast reinforced concrete beam member 3 Recessed part 4 Beam bar 5 Connecting bar 50 S-shaped bar 51 Oval bar

Claims (3)

In the joint structure between precast reinforced concrete beam members,
The beam member has a recess formed in the front center portion of the end portion to be joined, and a beam line horizontally traversing the recess is exposed in the vertical direction to a position near the tip of the plurality of beam members. The ends of the two precast reinforced concrete beam members are positioned relative to each other and aligned,
Connecting members straddling the recesses of the beam members are respectively inserted between the plurality of exposed beam bars;
The connecting member is an S-shaped reinforcing bar, an oval reinforcing bar, or a reinforcing bar having a combination of an S-shaped reinforcing bar and an oval reinforcing bar. , The upper side and the lower side are inserted in a symmetrical arrangement when viewed in plan, and an oval reinforcing bar is inserted in the middle position ,
A joining structure of precast reinforced concrete beam members, wherein the hardened material is injected and filled into the recesses and fixed, and the precast reinforced concrete beam members are joined together. Connecting members which are deposited with between multiple protruding beams muscle, characterized in that it is integrally formed an oval Rebar S-rebar in the top and bottom, respectively a comb shape at the intermediate position, according to claim 1 junction structure of precast reinforced concrete beam members to each other as described. Curing materials, concrete or grout, characterized in that it is a epoxy resin, junction structure of precast reinforced concrete beam members to each other according to claim 1 or 2.

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