JPH04368530A - Column and beam joint structure - Google Patents

Abstract

PURPOSE:To eliminate the field arrangement of a hoop reinforcement, rationalize field work, increase the degree of freedom of construction procedures and use lap joints for joining the lower end reinforcements of a PC beam by forming an SRC-structure steel frame in a through-beam structure and using band plates fox junction panels. CONSTITUTION:Column steel frames 15 are respectively joined to the upper and lower flanges 12a, 12b of a joint portion 10 formed by integrating in a cross state steel frames 12 which consist of the upper and lower flanges 12a, 12b and webs 12c. To the end faces of the steel frame 12 at the joint portion 10, beam steel frames 23 of a beam 22 are joined, where band plates 14 approximately L-shaped are provided and joined between the webs 12c of the respective steel frames 12 in horizontal in such a manner that the crossings of the joint portion 10 are encircled. Also, the lower end reinforcements 19 of a PC beam 22 are joined together via lap joints 25.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a column-to-beam joint structure which is suitable for joining columns of SRC structure and PC beams, mainly in the construction of mid- to high-rise precast concrete structures.

0002

[Prior Art] Conventionally, this type of column-beam joint structure includes:
For example, there is a joining structure as shown in FIG. in particular,
A PC beam 1 is rigidly connected to a column steel frame 4 via a joint plate 3 fixed to and protruding from a beam steel frame 2 at an end thereof. In addition, the upper end reinforcement or lower end reinforcement 5 placed on the inside of the upper end or the inside of the lower end of the stirrup bar of the PC beam 1 is connected to the other PC beam 1 via the relay reinforcing bar 6 inserted later in the joint.
It is joined to the upper end reinforcement or the lower end reinforcement 5. Further, in this joint portion, main column reinforcements 7 are arranged at predetermined positions around the column steel frame 4. Furthermore, several hoop reinforcements 8 are arranged at predetermined intervals so as to be wrapped around these column main reinforcements 7.

0003

[Problems to be Solved by the Invention] However, in the column-to-beam joint structure of the above configuration, since the steel frame passes through the columns, there are many regulations in the construction procedure, resulting in poor work efficiency. There is. In other words, it is not possible to change the construction procedure of joining the column steel frame 4 and the beam steel frame 2 of the PC beam 1 on site, placing the main column reinforcement 7, and then placing the hoop reinforcement 8. This requires a lot of work and is irrational.

[0004] Furthermore, when arranging the hoop striations 8, it is necessary to previously form through holes in the web of the PC beam 1 through which the hoop striations 8 pass. Therefore, work such as positioning the through hole and drilling the hole requires time and effort. Moreover, since the hoop reinforcement 8 is arranged through a through hole provided in the web of the PC beam 1, it is not possible to use one continuous hoop reinforcement, and the split hoop reinforcement 8a, 8a, 8a, which is divided into four parts in advance, 8a must be used. Therefore, after arranging each split hoop reinforcement 8a, 8a, 8a, 8a, it is necessary to join the joints of each hoop reinforcement 8a, 8a, 8a, 8a by means such as flare welding, which requires on-site work. Not only does this make the work even more complicated, but it also creates problems such as the work being affected by the weather.

[0005] In addition, in such a column-through structure, the joint between the column steel frame 4 and the beam steel frame 1 is inside the column surface, so the upper end reinforcement or lower end reinforcement 5 of the PC beam 1 and the relay reinforcement Various operations such as joining with 6 must be performed within a narrow joint, resulting in poor workability.

Furthermore, in the conventional example, the upper end reinforcement or the lower end reinforcement 5 of the PC beam 1 is joined by pressure welding, enclosure welding, or a mechanical joint, which causes considerable dissatisfaction in terms of joining performance and cost. Ideally, it is desirable to join the upper end reinforcements or the lower end reinforcements 5 by a lap joint, but such a lap joint cannot be used within the current general beam width.

[0007] In addition, since the width of the column 9 is generally wider than the width of the PC beam 1 (in the concrete cross section), the width of the PC beam 1
The upper end reinforcement or the lower end reinforcement 5 is arranged to penetrate the web 4c of the column steel frame 4. Therefore, column steel frame 4
It is necessary to form a through hole in advance in the web 4c, and it takes time and effort to position the through hole and make the hole.

[0008] Furthermore, the formwork for pouring concrete, such as the protruding corner portion of the column at the joint between the column 9 and the PC beam 1, has a complicated shape. For this reason, there is also the problem that processing the formwork requires complicated work and costs.

[0009] The present invention was made in view of the above circumstances, and by making the steel frame into a structure where the beams pass through, it eliminates the on-site placement of hoop reinforcement, streamlines on-site construction, and improves the construction speed. You can increase the degree of freedom in the procedure, and
Lap joints can be used to connect the bottom reinforcement of PC beams.
The purpose is to provide a joint structure between columns and beams.

0010

[Means for Solving the Problems] The present invention provides a structure in which a column steel frame is respectively joined to the upper and lower flanges of a joint section formed by integrating a steel frame consisting of upper and lower flanges and a web in a crossing state, and The beam steel frames of the PC beams are connected to the end faces of the steel frames of each section, and a substantially L-shaped band plate is connected between the webs of each steel frame so as to surround the intersection of the joint section. It is provided to connect horizontally, and the PC
The solution was to connect the lower end reinforcement placed inside the lower end of the stirrup reinforcement of the beam with a lap joint.

[0011]

[Operation] According to the column-to-beam joint structure of the present invention, since the steel frame has a structure where the beam passes through, the steel frames are integrated in a crossing state to form a joint part in advance in a factory, etc. It becomes possible to provide a band plate so as to surround the intersection of the mouth parts, which reduces on-site work and improves efficiency. Furthermore, by using a band plate instead of the conventional hoop reinforcement, the complicated work of installing the hoop reinforcement on site can be eliminated. In addition, by making the steel frame into a structure where the beams pass through, the joint between the column steel frame and the beam steel frame is exposed outside the column surface, which not only improves work efficiency, but also increases the degree of freedom in the construction procedure and improves work efficiency. You can improve your performance.

Furthermore, since a lap joint is used to join the bottom reinforcement of the PC beam, there is no need to form a through hole in the column steel frame for inserting the bottom reinforcement, which simplifies the joining work and improves the joining performance. It is also advantageous in terms of cost.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A column-to-beam joint structure according to the present invention will be described below with reference to FIGS. 1 to 6.

FIG. 1 is for explaining an embodiment of a joint structure between a column and a beam, and shows a joint section 10 before concrete is poured.
An example of the structure is shown. Reference numeral 12 in the figure is a steel frame composed of upper and lower flanges 12a, 12b and a web 12c. A portion 10 is formed.

[0015] At the intersection of the joint parts 10, the joint parts 10
A reinforcing plate 13 that reinforces the upper and lower flanges 1 of each steel frame 12
It is provided between 2a and 12b in contact with the web 12c. Further, on the outside of these reinforcing plates 13, this joint part 10 is provided.
A band plate 14 is provided to horizontally connect the webs 12c of each steel frame 12 so as to surround the intersection of the steel frames 12. The band plates 14 are approximately L-shaped and are arranged between the webs 12c of each steel frame 12 in several pieces at predetermined intervals in the vertical direction. The band plate 14 and the web 12c of the steel frame 12 are joined by means such as welding.

[0016] The upper and lower surfaces of the joint part 10 formed in this way,
That is, on the upper surface of the upper flange 12a and the lower surface of the lower flange 12b of each steel frame 12, columns 2 of the SRC structure are provided.
1 column steel frame 15 is joined.

Furthermore, beam steel frames 23 of PC beams 22 each consisting of upper and lower flanges 23a, 23b and webs 23c are joined to the end faces of each steel frame 12 of this joint section 10.

Next, the reinforcement arrangement at the joint between a column and a beam will be explained with reference to FIGS. 2 and 3. FIG. 2 is a plan view showing how the reinforcement is arranged in a linear joint, and FIG. 3 is a side view.

Column main reinforcements 16, 16, . . . are arranged at positions close to or in contact with the inner surface of the band plate 14 and around the column steel frame 15.

Furthermore, stirrup bars 17 are provided on the upper surface of the PC beam 22 that is joined to the end surface of each steel frame 12 of the joint section 10.
The upper end of is protruding. An upper end reinforcement 18 and a lower end reinforcement 19 are arranged inside the upper end and the lower end of the stirrup reinforcement 17, respectively, with their tips protruding from the end surface of the PC beam 22.

[0021] The upper end reinforcement 18 is joined by means such as pressure welding via a connecting fixing reinforcement 20 introduced into the joining portion. Alternatively, in addition to pressure welding, welding methods such as enclosure welding and thermite welding, and mechanical joints such as screw connections, splice sleeve joints, and coupler joints may be used.

Further, the lower end reinforcement 19 has its tip bent upward at an angle of about 90°. Further, in this joint, a lap joint 25 is arranged at a position passing outside the web 15c of the column steel frame 15, and its tip is overlapped with the lower end reinforcement 19 by a predetermined length in an upward direction. About 9 towards
It is bent at an angle of 0°. Here, empty stacking means that a predetermined length of sheets are arranged in parallel to each other in the horizontal direction.

Further, although FIGS. 2 and 3 show an example in which only the bottom reinforcement 19 is joined by the lap joint 25 as described above, alternatively, as shown in FIG. 4, both the top reinforcement 18 and the bottom reinforcement 19 are joined. It is also possible to join them using a lap joint 25.

Next, an example of reinforcing arrangement in a T-shaped joint will be explained with reference to FIGS. 5 and 6.

In the T-shaped joint, the other end of the connecting fixing bar 20 connected to the upper end bar 18 of the PC beam 22 is bent downward and fixed as shown in FIG. PC beam 2
The tip of the lower end reinforcement 19 of No. 2 is bent upward into a substantially U-shape. Also, a lap joint 25 introduced into this T-shaped joint
is bent upward into a substantially U-shape at a position where one end overlaps the lower end reinforcement 19 by a predetermined length. Also,
The other end of this lap joint 25 is moved upward by approximately 90° within the joint.
It is bent and fixed.

Next, a method for constructing the column-beam joint structure as described above will be explained.

First, in a factory or the like, a joint part 10 is made by integrating the steel frames 12 in an intersecting manner, and a band plate 1 is attached so as to surround the intersection part of this joint part 10.
4 is provided to horizontally connect the webs 12c of each steel frame 12. In addition, a column steel frame 15 that constitutes the column 21 is prepared. Then, the column steel frame 15 is assembled, and the joint part 10 is placed on it and joined together, and the column steel frame 15 is similarly assembled on top of this joint part 10 and joined together. In this way, the steel frame portion of the column with the required number of nodes is formed in advance and then transported to the site.

At the site, after installing the steel frame part of this column at a predetermined position, the main reinforcement bars 16 of the column are arranged so as to pass through the joint portion 10 at a position close to or in contact with the inner surface of the band plate 14. conduct. In addition, beam steel frames 23 of PC beams 22 are connected to the end faces of each steel frame 12 of the joint section 10, respectively.
The upper end reinforcement 18 of the PC beam 22 is joined to the connecting fixing reinforcement 20 inserted later into the joint section 10. Also, Shiguchi part 1
0, a lap joint 25 is introduced into the lower end reinforcement 1 of the PC beam 22.
9, and a predetermined length of empty overlap is provided.

As explained above, according to this column-to-beam joint structure, the steel frame of the SRC structure has a structure where the beam passes through, so the steel frames 12 are integrated in a crossed state in advance at a factory or the like. It becomes possible to form the opening portion 10 and further provide the band plate 14 so as to surround the intersection of the closing portion 10, thereby reducing work at the site and achieving rationalization. Furthermore, by using the band plate 14 instead of the conventional hoop bars, it is possible to eliminate the complicated work of attaching the hoop bars on site. Further, since no hoop reinforcement is used, there is no need to provide a through hole for passing the hoop reinforcement through the web 12c of the steel frame 12, and the work can be simplified.

[0030] Furthermore, by adopting a beam-through structure, the joint between the joint part 10 and the PC beam 22 is exposed outside the column surface, which not only improves work efficiency but also increases the degree of freedom in the construction procedure. This makes it possible to improve work efficiency. For example, it is possible to attach the main column reinforcements 16 and the hoop of the column shaft part when constructing the steel frame, and there is no need to perform reinforcement work for the main column reinforcements 16 after joining the beam steel frame and the column steel frame. Moreover, the band plate 14 serves as a position guide for the column main reinforcement 16, and it is possible to improve reinforcement accuracy.

Furthermore, since the lap joint 25 is used to join the lower end reinforcement 19 of the PC beam 22, the amount of shrinkage of the lower end reinforcement 19 is significantly reduced compared to a joining method such as pressure welding, and the joint performance is improved. At the same time, it is possible to reduce costs.

Furthermore, by using the lap joint 25 in this manner, it is not necessary to pass the lower end reinforcement 19 of the PC beam 12 through the web 15c of the column steel frame 15. Therefore, the effort of forming a through hole in the web 15c of the column steel frame 15 can be saved, and the work can be simplified and labor saved.

Furthermore, the shape of the formwork for pouring concrete, such as the protruding corner portion of the column at the joint between the column 21 and the PC beam 22, is simplified. This makes it easier to process the formwork,
It is possible to improve work efficiency and reduce costs.

Note that the column-to-beam joint structure of the present invention is not limited to the above-mentioned embodiments, and may vary depending on the shape, material, and shape of each member.
Specific structural requirements such as construction procedures can be changed as appropriate during implementation.

[0035]

[Effects of the Invention] As explained above, according to the column-to-beam joint structure of the present invention, the steel frames are passed through the beams. It becomes possible to form a mouth part and further provide a band plate so as to surround the intersection of the joint part, thereby reducing on-site work and streamlining the process. Furthermore, by using a band plate instead of the conventional hoop reinforcement, the complicated work of installing the hoop reinforcement on site can be eliminated. In addition, by making the steel frame into a structure where the beams pass through, the joint between the joint part and the PC beam is exposed outside the column surface, which not only improves work efficiency, but also increases the degree of freedom in the construction procedure. Efficiency can be improved.

Furthermore, since a lap joint is used to join the lower end reinforcements of the PC beams, it is possible to improve joining performance and reduce costs. In addition, by using lap joints in this way, there is no need to pass the lower end reinforcement of the PC beam through the web of the column steel frame, which eliminates the need to form through holes in the web of the column steel frame, simplifying the work and saving labor. It is possible to aim for In addition, the shape of the formwork for concrete pouring, such as the protruding corner of the column at the joint between the column and the PC beam, is simplified, making it easier to process the formwork, improving work efficiency and reducing costs. I can figure it out.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of a column-beam joint structure of the present invention.

FIG. 2 is a plan view showing an example of how reinforcement is arranged in a linear joint between a column and a beam.

FIG. 3 is a side view showing how the reinforcement is arranged.

FIG. 4 is a side view showing another example of reinforcing reinforcement in a linear joint between a column and a beam.

FIG. 5 is a plan view showing an example of how reinforcement is arranged in a T-shaped joint between a column and a beam.

FIG. 6 is a side view showing how the reinforcement is arranged.

FIG. 7 is a plan view showing an example of a conventional column-beam joint structure.

[Explanation of symbols]

10 Shiguchi section 12 Steel frame 12a Upper flange 12b Lower flange 12c Web 14 Band plate 15 Column steel frame 17 Stirrup muscle 19 Lower end reinforcement 21 Pillar 22 PC beam 23 Beam steel frame 25 Overlap joint

Claims (1)

[Claims] Claim 1: Column steel frames are respectively connected to the upper and lower flanges of a joint section, which is formed by integrating steel frames consisting of upper and lower flanges and webs in an intersecting state, and each end face of the steel frame of the joint section is connected to a column steel frame. A substantially L-shaped band plate is provided to horizontally connect the webs of each steel frame so that the beam steel frames of the PC beams are joined and surround the intersection of the joint part, Further, a column-to-beam joint structure is characterized in that a lower end reinforcement arranged inside the lower end of a stirrup reinforcement of a PC beam is joined by a lap joint.