JP2007332548A - Column-beam joint structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To rationally join a PC-column to an S-beam. <P>SOLUTION: The PC-column 1 and S-beam 2 are joined to each other through a joint part 3 made of steel shell concrete. The joint part is constructed by a shell steel plate 11, filling concrete 12 filling the interior thereof, and an anchor bar 13 fixed to both of the filling concrete and the column, wherein the end part of the beam is inserted in the shell steel plate and fixed to the filling concrete. A cover plate 14 made of a steel plate covering the partial or entire surface of the tip face of the joint part is provided, and the tip of the anchor bar is fastened to the cover plate. Alternatively a fixing head part is formed integrally with the tip of the anchor bar. An engagement projecting part 18 engaged with the filling concrete is formed on the inner surface of the shell steel plate or the surface of the beam. A placing opening for filling concrete is provided on the top face of the shell steel plate. It is also considered to take a precast member as the joint part. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a building having a mixed structure of reinforced concrete (RC) and steel (S), and more particularly to a structure for joining an RC column and an S column.

  This kind of mixed structure has both the advantage of RC construction that construction is possible at low cost and the advantage of S construction that construction is possible in a short construction period. It is said that it is suitable as a building structure for low-rise large-scale merchandise sales facilities, warehouses, etc., and is in the mood for widespread use.

By the way, when constructing a building of this type of composite structure, it is necessary to join the RC column and the S beam, which are different structural members, so that they are structurally and constructively constructed. Various methods have also been proposed for rationally doing this.
For example, Patent Document 1 shows a structure in which the end of the steel frame portion at the center of the beam is embedded in the end reinforced concrete portion of the beam end portion, and Patent Document 2 discloses a part of the main reinforcement of the reinforced concrete portion as a steel frame. And the tip of the other main bars are fastened to the end face of the reinforced concrete part. Patent Document 3 discloses that a support plate is provided on the steel beam embedded in the reinforced concrete beam. It is shown.
Japanese Examined Patent Publication No. 4-38854 Japanese Patent Publication No. 7-65381 JP 2005-76379 A

  However, since all of the above conventional structures have RC ends at the beam ends, a large shearing force acts on the beam ends at the RC ends. Therefore, the shear strength there is sufficient. It is necessary to perform sufficient shear reinforcement in order to ensure this. In that respect, according to the conventional joining method as shown in Patent Documents 1 to 3, it is necessary to densely arrange a shear reinforcement bar (large bar) having a large cross section at the beam end, or In some cases, it is necessary to use a high-strength reinforcing bar, so that not only the workability is not good but also disadvantageous in terms of construction cost, and the advantage of the mixed structure is not necessarily fully utilized.

  In view of the above circumstances, an object of the present invention is to provide an effective and appropriate joint structure capable of joining an RC column and an S beam more reasonably.

  The column-to-beam joint structure according to the first aspect of the invention is characterized in that an RC column and an S beam are joined via a steel shell concrete joint.

  Invention of Claim 2 is the joining structure of the pillar and beam of invention of Claim 1, Comprising: The junction part of steel-shell concrete is the outer shell steel plate which comprises the surrounding surface of the said junction part, It consists of filled concrete that is integrally filled inside, and anchor bars that are fixed to both the filled concrete and the column and integrate the entire joint to the column. It is characterized by being inserted into and fixed to the filled concrete.

  The invention according to claim 3 is the column / beam joining structure according to claim 2, wherein a cover plate made of a steel plate covering a part or the whole of the tip surface of the joint is provided, and the tip of the anchor bar It is characterized by being fastened to the cover plate.

  According to a fourth aspect of the present invention, there is provided a column-to-beam joint structure according to the second aspect of the present invention, wherein the fixing head is integrally formed at the tip of the anchor bar.

  The invention according to claim 5 is the column-to-beam joint structure according to any one of claims 2 to 4, wherein both the inner surface of the outer shell steel plate and the surface of the beam or at least one of them are filled concrete. It is characterized in that an engaging convex portion that engages with the ridge is formed.

  The invention according to claim 6 is the column-to-beam joint structure according to any one of claims 2 to 5, and is a placement port for placing and filling filled concrete on the upper surface of the outer shell steel plate. It is characterized by providing.

  Invention of Claim 7 is the joining structure of the pillar and beam in any one of Claims 2-6, Comprising: Filling concrete is carried out to the whole or a part in outer shell steel plate for the junction part of steel shell concrete construction. A precast member filled in advance is used, and the end of the beam and the tip of the anchor bar are fixed in advance at the joint, and the base end of the anchor bar is protruded.

The steel shell concrete structure (SC structure) in the present invention has a structure in which the outer shell steel plate is integrally filled with the filled concrete, and the outer shell steel plate restrains the filled concrete from the outside and exerts a shear reinforcement effect. Therefore, in the present invention, the RC column and the S beam are structurally and firmly integrated with each other through such a strong SC joint. It is possible to sufficiently secure the joint strength between the column and the beam.
The SC structure has a simple structure in which the outer shell steel plate is simply filled with filled concrete, and shear reinforcement bars and formwork are not required compared to the case where the joint is made of RC structure. Therefore, in the construction, the workability can be greatly improved, and the cost can be reduced sufficiently.

In particular, by providing a cover plate on the front end surface of the joint, the restraining effect on the filled concrete can be further enhanced, and by fastening the anchor bar to the cover plate, The pillar can be more reliably integrated.
Alternatively, by providing a fixing head at the tip of the anchor reinforcement, the anchor strength of the anchor reinforcement relative to the filled concrete can be sufficiently increased, and the outer steel plate and the column are reliably integrated via the anchor reinforcement and the filling concrete. Can be made.

  In addition, by providing engaging projections on the inner surface of the outer shell steel plate and the outer surface of the beam, it is possible to more securely fix the outer shell steel plate and the beam to the filled concrete, thereby further preventing the beam from coming out. This can be reliably prevented, and a compression strut can be formed on the filled concrete to achieve more effective stress transmission.

  Furthermore, when the joint is constructed, the outer shell steel plate naturally functions as a placement mold, so efficient construction is possible simply by placing and filling the filled concrete from the placement opening provided on the top. is there.

  Furthermore, if the steel shell concrete joint is manufactured in advance as a precast member, the field work can be further simplified.

1 to 4 show an embodiment of the present invention. This embodiment is mainly intended to join a reinforced concrete (RC) column 1 and a steel frame (S) beam 2 via a steel shell concrete (SC) joint 3. is there.
That is, the column 1 in this embodiment is based on the normal RC structure in which the column reinforcement 4 including the column main reinforcement 4a and the strip reinforcement 4b is built in the concrete 5, and the beam 2 is made of an ordinary steel frame such as H-section steel. In this embodiment, when the beam 2 is joined in the four directions around the column 1, it is not joined via a simple RC joint as usual (in other words, Patent Document 1). As shown in -3, the end of the beam is not made of RC, but instead of the RC joint, an SC joint 3 is provided, and through the SC joint 3 The S-shaped beam 2 is firmly bonded to the RC column 1.

In this embodiment, the SC joint 3 includes an outer shell steel plate 11 constituting the entire peripheral surface, a filled concrete 12 that is integrally filled in the outer shell steel plate 11, and the entire joint with respect to the column. In order to integrate them, the anchor muscle 13 is formed.
As shown in FIG. 1, the outer shell steel plate 11 has a hollow cylindrical shape having a rectangular cross section as a whole, and the outer shell steel plate 11 is formed by welding four steel plates into a rectangular tube shape or desired. What cut | disconnected the square steel pipe of a cross section to desired length is used. The base end surface of the outer shell steel plate 11 (the end surface on the side facing the column 1) is completely open, but a horizontally long cover plate 14 made of a steel plate is welded to the upper and lower sides of the opposite end surface, respectively. The cover plates 14 are formed with holes 15 for fastening through the anchor bars 13.
The anchor bars 13 are composed of five screw bars arranged in a horizontal row at the top and bottom of the end of the beam 2, and the anchor bars 13 are inserted between the column main bars 4 a and pass through the column 1. The intermediate portion is fixed to the column 1 in a state of penetrating, both end portions protrude to both sides of the column 1 and are fixed to the filling concrete 12 in the outer shell steel plate 11, and anchor bars 13 is inserted into the hole 15 formed in the cover plate 14 and a nut 16 is screwed into the hole 15 so that the anchor bar 13 is connected to the outer steel plate 11 via the cover plate 14. It has come to be concluded.

Since the outer shell steel plate 11 also functions as a casting mold for casting and filling the filled concrete 12, a casting port 17 for the filling concrete 12 (4 in the illustrated example is circular). However, if the shear reinforcement effect is impaired by providing such a placement port 17, a steel plate lid is finally welded to the placement port 17 to close it. Just do it.
Further, as shown in FIG. 2, a steel strip as an engaging projection 18 that engages with the filling concrete 12 is welded to desired positions on the upper and lower surfaces inside the outer shell steel plate 11, and the end of the beam 2 is also welded. The same steel strip as the engaging convex portion 18 is also welded to the upper and lower surfaces of the portion.

In constructing the frame composed of the column 1 and the beam 2 joined by the above structure, when the column reinforcement 4 is assembled, the anchor reinforcement 13 is arranged and the anchor reinforcement 13 protrudes on both sides of the pillar 1. Prior construction of pillar 1.
Then, the outer shell steel plate 11 is attached to the outside of the anchor bar 13 protruding from the column 1, the tip end portion of the anchor bar 13 is inserted into the hole 15 formed in the cover plate 14, and fastened by the nut 16. 11, the end of the beam 2 is inserted, the end of the beam is brought into contact with the peripheral surface of the column 1, and in this state, the filling concrete 12 is cast and filled into the outer shell steel plate 11 from the casting port 17. At this time, the outer shell steel plate 11 functions as a driving mold itself, and the cover plate 14 functions as a part of the wife frame, so that the periphery of the beam 2 is blocked only between the upper and lower cover plates 14. No need to attach the wife formwork separately.

  As described above, the SC joint 3 is constructed, and the RC pillar 1 and the S beam 2 are structurally integrally joined via the SC joint 3 to form a composite frame. The

According to the structure of the present embodiment, the outer shell steel plate 11 constituting the peripheral surface of the joint portion 3 restrains the internal filling concrete 12 from the outside, and shear reinforcement bars (肋 肋) in a normal RC joint portion. In addition, it is possible to obtain an excellent shear reinforcement effect only by the thin cylindrical steel plate 11 having a simple cylindrical tube shape, and the shear reinforcement effect only by adjusting the thickness of the outer shell steel plate 11. It is also possible to freely adjust the width of the joint 3, so that the large number of reinforcing bars required for the RC joint is not required, and the entire structure of the joint 3 is sufficiently simplified. Can do.
Further, in the construction, it is only necessary to install a small number of anchor bars 13 and the outer shell steel plate 11 in place of a large number of reinforcing bar reinforcing work, and the outer shell steel plate 11 is naturally placed in the driving formwork. Therefore, it is only necessary to attach some formwork around the beam 2, so that the work related to bar arrangement and formwork can be greatly simplified compared to RC construction, and workability can be improved sufficiently. In combination with the simplification of the structure, the construction cost can be sufficiently reduced and the construction period can be shortened.

Of course, in the joint portion 3 having the SC structure as described above, the outer steel plate 11 not only exhibits a shear reinforcement effect, but also the anchor bar 13 functions as a main bar, and the tip of the anchor bar 13 is used as the main bar. Since it is fastened to the outer shell steel plate 11 via the cover plate 14, the entire joint 3 functions as a sufficiently strong SC structural member itself, and such a robust joint 3. Is integrated with both the column 1 and the beam 2 through the anchor bars 13 and the filling concrete 12 without fail, so that the column 1 and the beam 2 are structurally reliable through the joint 3. It can be firmly integrated to ensure sufficient bonding strength.
In addition, fixing strength of the outer shell steel plate 11 and the beam 2 with respect to the filling concrete 12 can be improved by providing an engagement convex portion 18 such as a strip steel on the inner surface of the outer shell steel plate 11 and the outer surface of the beam 2 as necessary. It is possible to further strengthen, thereby preventing the beam 2 from slipping out more reliably and forming a compression strut on the filled concrete 12 for more effective stress transmission.

  Although one embodiment of the present invention has been described above, the above embodiment is merely a preferred example, and the present invention is not limited to the above embodiment, and various modifications and applications as listed below, for example. Is possible.

  In the above embodiment, the horizontally long cover plates 14 are provided above and below the front end surface of the outer shell steel plate 11, but instead the cover plate 14 covers the entire front end surface of the outer shell steel plate 11 as shown in FIG. It is also conceivable that a cut 14 a having a shape matching the cross section of the beam 2 is formed in the cover plate 14. In that case, the restraining effect on the filled concrete 12 by the cover plate 14 is further enhanced, and after the beam 2 is passed through the notch 14a, the installation of the field formwork is completely omitted by simply closing the gap around it. Is also possible.

In the above embodiment, the anchor bars 13 are fastened to the outer shell steel plate 11 via the cover plate 14. However, the anchor bars 13 are not necessarily configured as described above. For example, as shown in FIGS. A simplified structure is also possible.
In other embodiments shown in FIGS. 6 to 7, the cover plate 14 in the above embodiment is omitted, and as the anchor bars 13, a fixing head 13 a is integrally formed at the tip of a deformed bar, The anchor bars 13 are simply fixed in the filled concrete 12 in an embedded state. Also in this case, the fixing strength of the anchor bars 13 to the filled concrete 12 can be sufficiently secured by the fixing head 13a.

  In the above embodiment, the steel strip 11 as the engagement convex portion 18 is welded to the inner surface of the outer shell steel plate 11 and the surface of the beam 2. However, the installation position and number of the engagement convex portions 18 are arbitrary and may be increased or decreased as appropriate. If not necessary, the engaging protrusion 18 may be omitted as in the embodiment shown in FIGS. Needless to say, the engagement protrusion 18 is not limited to the strip steel, and any appropriate one including a stud can be employed. In short, the engagement protrusion 18 can increase the fixing strength of the outer steel plate 11 and the beam 2 with respect to the filled concrete 12. Since it is good, it is also conceivable that the inner surface of the outer shell steel plate 11 or the surface of the beam 2 is subjected to uneven processing or a step is provided so that they function as the engaging convex portion 18.

  In the above embodiment, after the column 1 and the anchor bar 13 are preliminarily constructed, the outer shell steel plate 11 is attached to the column 1 and the end of the beam 2 is inserted into the outer shell steel plate 11. Although the construction procedure of placing the filling concrete 12 has been described, it is also conceivable to place the concrete 5 on the pillar 1 and fill the outer steel plate 11 with the filling concrete 12 simultaneously. That is, when the column form frame is assembled by arranging the column reinforcement 4 and the anchor reinforcement 13, the outer shell steel plate 11 is attached to the outside of the column form frame, the beam 2 is inserted therein, and the column in this state What is necessary is just to construct the pillar 1 and the junction part 3 simultaneously by placing and filling concrete into the formwork and the outer shell steel plate 11 collectively. According to such a procedure, workability can be further improved, and the placing port 17 provided in the outer shell steel plate 11 can be omitted.

  Since the above embodiment is an application example in the case where four beams 2 are joined in a cross shape around the pillar 1 located inside the building, the anchor bars 13 in two directions are crossed. In this case, the bars 1 may be penetrated to arrange the bars, and the two joints 3 may be provided in opposite states at both ends of the anchor bars 13 in each direction. In this case, the positions of the anchor bars 13 in both directions are moved up and down. What is necessary is just to avoid the mutual interference in a penetration part by shifting. However, instead of penetrating the two-direction anchor bars 13 in an intersecting state, it is also conceivable to arrange the four-direction anchor bars 13 for the four joints 3 independently. What is necessary is just to fix the base end part of the line | wire 13 to the pillar 1, respectively. The method is such that two beams 2 are joined in an orthogonal state to the pillar 1 located at the corner of the building, or the three beams 2 are T-shaped with respect to the pillar 1 located at the outer periphery of the building. It can be suitably used when joining to the substrate.

In the above embodiment, the filling concrete 12 into the outer shell steel plate 11 is filled on site to construct the joint portion 3 on the site. However, the filling concrete 12 is filled in the outer shell steel plate 11 in advance and the joint portion 3 is filled. Can be manufactured as a precast member, and the end of the beam 2 and the tip of the anchor bar 13 can be fixed in advance. In that case, if the filled concrete 12 is filled in the entire outer shell steel plate 11, it becomes a full precast member, and if the filled concrete 12 is filled only partially while leaving the upper portion in the outer shell steel plate 11, it becomes a half precast member.
FIG. 8 shows an example in which the joining structure of the previous embodiment shown in FIG. 2 is precast and the column 1 is also precast. The joint 3 in this example is a half precast member pre-filled with filled concrete 12 up to the level of the upper flange of the beam 2, in which the end of the beam 2 is fixed in advance, and the lower anchor bars 13 are The tip end portion is fixed in a state in which the base end portion protrudes rearward (the mouth end side).
And after arrange | positioning the junction part 3 of each direction in the circumference | surroundings of a joint part, as shown in figure between the base ends of both anchor muscles 13 which oppose on both sides of a joint part, it is by joint 20, such as a sleeve joint. The upper anchor bars 13 are penetrated through the joints and arranged at the upper part of the outer shell steel plates 11, and then the upper-level pillars 1 are installed. What is necessary is just to complete the joint part 3 by pouring concrete into the upper part inside, and to form a slab simultaneously.
As a result, in the same manner as shown in FIG. 2, the RC (more strictly, PCa) column 1 and the S beam (2) are joined to the SC (more precisely, PCaSC) column. In addition to being able to be securely and firmly joined via the portion 3, it is possible to realize further simplification of on-site construction by precasting as compared to the previous embodiment.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view showing a configuration of an SC-made joint portion according to an embodiment of the joint structure of the present invention. It is an elevational sectional view of a joined part. It is a plane sectional view of a joined part same as the above. It is the side view and side sectional view of a junction part same as the above. It is a perspective view which shows the other example of an outer shell steel plate. The other embodiment of the junction structure of the present invention is shown and is an elevational sectional view of a junction. It is a plane sectional view of a joined part same as the above. Another embodiment of the junction structure of the present invention is shown, and is an elevational sectional view of a junction part.

Explanation of symbols

1 Pillar (RC construction)
2 Beam (S structure)
3 Junction (SC)
4 Column reinforcement 4a Column main reinforcement 4b Band reinforcement 5 Concrete 11 Outer steel plate 12 Filled concrete 13 Anchor reinforcement
13a Fixing head 14 Cover plate 14a Notch 15 Hole 16 Nut 17 Placing port 18 Engaging convex part (band)
20 Fitting

Claims (7)

  A column-to-beam joint structure characterized by joining a reinforced concrete column and a steel-framed beam via a steel shell concrete joint. The column-beam joint structure according to claim 1,
The steel shell concrete joint is fixed to both the outer shell steel plate constituting the peripheral surface of the joint, the filled concrete integrally filled therein, and both the filled concrete and the column. It consists of anchor bars that integrate the entire joint with the column,
A column-beam joint structure characterized in that the end of the beam is inserted into the outer shell steel plate and fixed to the filled concrete. The column-beam joint structure according to claim 2,
A column-to-beam junction structure comprising a cover plate made of a steel plate that covers a part or the whole of the tip end surface of the joint portion, and the tip end portion of the anchor bar being fastened to the cover plate. The column-beam joint structure according to claim 2,
A column-to-beam joint structure characterized by integrally forming a fixing head at the tip of an anchor muscle. It is the junction structure of the pillar and beam in any one of Claims 2-4,
A column / beam joining structure characterized in that an engagement convex portion that engages with filled concrete is formed on both or at least one of the inner surface of the outer shell steel plate and the surface of the beam. It is the junction structure of the pillar and beam according to any one of claims 2 to 5,
A column-to-beam joint structure, characterized in that a casting port for casting and filling filled concrete is provided on the top surface of the outer shell steel plate. It is the junction structure of the pillar and beam in any one of Claims 2-6,
The steel shell concrete joint is a precast member in which the whole or part of the outer shell steel plate is pre-filled with concrete, and the beam end and the anchor bar tip are fixed in advance in the joint, A column-to-beam joint structure characterized in that the base end of the anchor bar protrudes.

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