JP2592666Y2 - Joint structure of reinforced concrete columns - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure in which main reinforcing bars of reinforced concrete columns are overlapped and joined.

[0002]

2. Description of the Related Art Conventionally, when a reinforced concrete column is added, pillar main bars to be joined are pressed and joined to each other to integrate the joined columns. By the way, in joining reinforced concrete columns in this way, the column main reinforcement has a diameter of, for example, 29 mm.
When the above-described large-diameter deformed reinforcing bar is used, it is desirable to use a lap joint.

[0003] As described above, a structure in which large-diameter deformed reinforcing bars are joined by lap joints is disclosed in, for example, Japanese Unexamined Utility Model Publication No.
As disclosed in Japanese Unexamined Patent Publication, the lap joint portion is surrounded by an iron plate provided on the inner periphery of the PC column formwork, and concrete is cast therein.

[0004]

However, in such a conventional joint structure of a reinforced concrete column, the outer periphery of the plurality of column main reinforcements is only surrounded by a single iron plate, and the cross-sectional area of the column is extremely large. On high pier supports such as highways, the binding force of the lap joints of the main bars of the columns decreases,
There was a problem that the joint strength between reinforced concrete columns was reduced.

[0005] In view of the above-mentioned problems, the present invention relates to the size of the cross-sectional area of a column by dividing a plurality of pairs of column main reinforcements into small groups each of which is a plurality of pairs and constraining them by an iron plate. It is an object of the present invention to provide a joint structure of a reinforced concrete column in which the restraining force of the lap joint is increased without increasing the joint force.

[0006]

The first aspect of the present invention in order to achieve SUMMARY OF THE INVENTION The above object is splicing together each other in the number of pillars main reinforcements each other a pair of reinforced concrete to be joined to each other, the splice The inner and outer peripheries of the entire column main reinforcement are surrounded by inner and outer iron plates, and the inner and outer iron plates are defined by a plurality of partition iron plates at appropriate intervals, and the inner and outer iron plates and the partition iron plates are surrounded by the inner and outer iron plates. Inside, a plurality of pairs of the joints of the main bars are divided into small groups and restrained.

[0007] The second aspect of the present invention to achieve the above object, and spliced together a large number of pillar main reinforcement each other of reinforced concrete to be joined to each other, by a plurality of pairs of the lap joints with pillars main reinforcement It is divided into small groups, and the overlapping portion of each small group unit is surrounded by an independent iron plate and restrained.

[0008]

According to the above structure, in the joint structure of the reinforced concrete column shown in the first structure of the present invention, a plurality of inner and outer iron plates surrounding the inner circumference and the outer circumference of the entire column main reinforcement at the overlapped portion are provided. In the interior surrounded by the inner and outer iron plates and the partition iron plate, the lap joint of the column main reinforcement is defined by the partition iron plate.
Since multiple pairs were restrained in small groups, even for columns with extremely large cross-sectional areas, the lap joints of the main bars of the columns should be restrained almost equally, and the joining efficiency in each small group should be increased. Can be. Therefore, the strength of the joint between the reinforced concrete columns can be significantly increased.
Further, since the inner and outer peripheries of the entire column main reinforcement can be restrained by the inner and outer iron plates, even when the column is formed in a hollow shape, the lap joint portion of the column main reinforcement can be reliably restricted.

Further, in the joint structure of reinforced concrete column as shown in the second configuration of the present invention, divided into a plurality of pillars main reinforcement that is spliced to a plurality of pairs each subgroup, splice portion of each small group unit Are surrounded by independent iron plates and constrained, so that the joining efficiency in each subgroup is increased.
It is possible to securely restrain and to set the relative positional relationship of these iron plates arbitrarily, so even if the overall cross-sectional shape of the column is complicated, it is possible to easily and reliably restrain the lap joint of the main bar of the column. Can be done.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a sectional view of a main part showing a first embodiment of a joint structure of a reinforced concrete column according to the present invention. That is, the reinforced concrete column 10 using the joint structure of the present embodiment has a hollow rectangular cross section, and a large number of column main bars 12 are arranged in the hollow rectangular cross section. The column main bar 12 includes a lower main bar 12a erected from below and an upper main bar 12b disposed above and corresponding to the column main bar 12a. The lower main bar 12a and the upper main bar 12b form a pair. , Are superposed over a predetermined length and are overlapped. In the figure, the lower main bar 12a is indicated by a black circle, and the upper main bar 12b is indicated by a cross (the same applies to embodiments described later).

The column main reinforcement 12 is arranged along the cross-sectional shape of the reinforced concrete 10 to be constructed,
The inner and outer peripheries of the entire column main bar 12 are each surrounded by an inner iron plate 14 and an outer iron plate 16 in a rectangular ring shape. Also, a plurality of partition iron plates 18 are fixedly provided between the inner iron plate 14 and the outer iron plate 16 at appropriate intervals, and the inner and outer iron plates 14 and 16 are defined by the partition iron plates 18 in a plurality of small sections.

On the other hand, the lap joint portion of the column main bar 12
A plurality of pairs of the lower main bar 12a and the upper main bar 12b are formed in correspondence with the number of the inner and outer iron plates 14, 16 formed by the partition iron plate 18 .
Each divided into subgroups, the splice portion of the aliquot pillars main reinforcement 12, respectively, in these, the outer steel plate 14, 16 and the partition iron 1
8 and arranged inside each of them. The inner and outer iron plates 14 and 16 and the partition iron plate 18 are formed by the column main reinforcement 1.
2 is arranged only in the overlapped portion.

By the way, the inner and outer iron plates 1
A plurality of column main reinforcements 12 are provided by
After subdividing each pair into small groups and restraining them, an unillustrated formwork is arranged on the inner and outer peripheral portions of the reinforced concrete pillar 10 formed in a hollow shape, and concrete is poured into the formwork. It has become. The concrete poured into the formwork is also filled into the interior defined by the inner and outer iron plates 14 and the partition iron plate 18, and the filled concrete hardens to form a pair with the upper main reinforcing bar 12a and the lower main bar 12a. Main muscle 12
b is formed. In addition, it is desirable to use a PC form which is integrated with the concrete to be cast as the form arranged on the inner peripheral portion and the outer peripheral portion of the reinforced concrete column 10.

With the above structure, in the joint structure of the reinforced concrete columns according to the present embodiment, the upper main reinforcing bar 12a and the lower main reinforcing bar 12b are paired and superimposed and joined.
The inner and outer peripheries of the entire spliced column main reinforcement 12 are annularly surrounded by inner and outer iron plates 14 and 16, and the inner and outer iron plates 14 and 16 are defined by a plurality of partition iron plates 18. A plurality of overlapping portions of the main bar 12
It is adapted to dispense separately in pairs by a small group. Therefore, the overlapping portions of the plurality of pairs of the main bars 12 divided into small groups are constrained inside the inner and outer iron plates 14, 16 and the partition iron plate 18, so that each of the small bars is confined. In the group
Joint efficiency between the upper and lower column main bars 12a, 12b
In addition, irrespective of the cross-sectional area of the reinforced concrete column 10, its binding force can be made large and uniform. Accordingly, even in the case of a reinforced concrete column 10 having a remarkably large cross-sectional area, such as a column of a high pier such as a highway, the lap joint portions of the column main bars 12 can be substantially uniformly and reliably restrained, respectively. The strength of the joint between the columns 10 can be greatly increased.

Further, the inner and outer peripheries of the entire column main bar 12 are restrained by inner and outer iron plates 14 and 16,
As shown in the figure, even when the column 10 is formed in a hollow shape, the inner circumference of the entire column main bar 12 can be restrained by the inner iron plate 14, so that the overlapping portion of the column main bar 12 can be reliably restrained. Can be.

FIG. 2 shows a modification of the first embodiment. The same components as those of the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted. In this embodiment, the present invention is applied to a reinforced concrete pillar 10a having a hollow elliptical cross section. That is, in this embodiment, the lower main reinforcing bar 12a and the upper main reinforcing bar 12a are formed as the reinforced concrete column 10a is formed in a hollow elliptical shape.
The entire column main bar 12 superposed on the pair b is arranged in an elliptical shape along the cross-sectional shape of the reinforced concrete column 10a. Accordingly, the inner and outer iron plates 14a and 16a surrounding the inner and outer peripheries of the column main reinforcement 12 are formed in an elliptical shape, and a plurality of partition iron plates 18 are fixed at appropriate intervals between the inner and outer iron plates 14a and 16a. is there.

Therefore, even in this embodiment, the inner and outer iron plates 14a. In the interior defined by the steel plate 16a and the partitioning iron plate 18, the overlapping portions of the column main bars 12 can be divided into a plurality of small groups and restrained.
Irrespective of the cross-sectional shape, the binding force can be made large and uniform.

In the first embodiment, the reinforced concrete columns 10 and 10 have a hollow rectangular shape and a hollow elliptical cross section.
Although a is disclosed, it goes without saying that the present embodiment is not limited to this and can be applied to other reinforced concrete columns having a hollow shape or a solid shape.

FIG. 3 shows a second embodiment of the present invention, in which the same components as those of the above-described embodiments are denoted by the same reference numerals, and a duplicate description will be omitted. That is, in this embodiment, the lower main bar 12
a and the upper main reinforcing bars 12b are paired and the large number of column main reinforcing bars 12 are divided into small groups by a plurality of pairs , and each small group unit's overlapping connecting portion is surrounded and restrained by a plurality of independent iron plates 20. It is like that. In this embodiment, as in the embodiment shown in FIG. 1, the present invention is applied to a reinforced concrete pillar 10b having a hollow rectangular cross section.

Each of the iron plates 20 is formed in a cylindrical shape, and the column main reinforcing bars 12 divided into a plurality of small groups are surrounded and constrained by the respective cylindrical iron plates 20. The cylindrical iron plates 20 are arranged in a rectangular shape as a whole along the cross-sectional shape of the reinforced concrete column 10b in a state of being in contact with each other.

[0021] Therefore, it is possible to restrain in portions lap joint portion of the pillar main reinforcement 12 in a plurality of pairs each subgroup by the iron plate 20 as in the first embodiment Also in this embodiment, each of the small groups The upper and lower pillar main bars 12a and 12b
By increasing the joining efficiency, the overlapping portions can be almost uniformly and reliably restrained, and the joint strength of the reinforced concrete column 10b can be increased. Further, since the respective iron plates 20 are independent, the relative positional relationship between these iron plates 20 can be set arbitrarily, so that even when the overall cross-sectional shape of the column 10 is complicated, the overlapping portion of the column main reinforcing bar 12 can be formed. The restraint can be performed easily and reliably.

In this embodiment, a case where the present invention is applied to a reinforced concrete column 10b having a hollow rectangular cross section is disclosed. However, the present invention is not limited to this. For example, a reinforced concrete column 10c having a hollow elliptical cross section as shown in FIG. As shown in FIG. 5, the reinforced concrete column 10 has a hollow circular cross section.
d. Although not shown in the drawings, it goes without saying that the present invention can be applied to reinforced concrete columns having other irregular cross sections regardless of whether they are solid or hollow.

[0023]

[Effect of the Invention] As described above, claim 1 of the present invention
In the joint structure of reinforced concrete columns shown in (1), the inner and outer iron plates surrounding the inner and outer circumferences of the column main reinforcement are defined by a plurality of partition iron plates, and the inner and outer iron plates and the partition iron plates surround the inner and outer steel plates. therein being, since the restrained separately splice portion of the pillar main reinforcement in pairs by <br/> subgroup, a plurality of vertical in each subgroup
By increasing the joint efficiency between the pair of main bars, even for columns with extremely large cross-sections , the joints of the main bars are almost equally and securely restrained, and the strength of the joint between reinforced concrete columns Can be greatly increased. In addition, since the inner and outer peripheries of the entire column main reinforcement are constrained by inner and outer iron plates, even when the column is formed in a hollow shape, the lap joint portion of the column main reinforcement is reliably constrained to provide a reinforced concrete having a hollow cross section. A lap joint structure of a main bar of a column can be applied to the column.

In the joint structure of a reinforced concrete column according to a second aspect of the present invention, a plurality of piled-up main bars are divided into a plurality of small groups and a plurality of small-group-unit lap joints are formed. Each of the subgroups is composed of upper and lower pairs of pillars
Not only can the joint efficiency of the bars be increased, the lap joints of the column main bars can be reliably restrained and the joint strength can be increased, but the relative positional relationship between these iron plates can be set arbitrarily, so the entire cross section of the column Even when the shape is complicated, various excellent effects can be achieved in that the overlapping portion of the main pillar can be easily and reliably restrained.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a first embodiment of the present invention.

FIG. 2 is a sectional view of a main part showing a modified embodiment of the first embodiment of the present invention.

FIG. 3 is a sectional view of a main part of a second embodiment of the present invention.

FIG. 4 is a sectional view of a main part showing a modified embodiment of the second embodiment of the present invention.

FIG. 5 is a cross-sectional view illustrating a main part of another modification of the second embodiment of the present invention;

[Explanation of symbols]

10, 10a, 10b, 10c, 10d Reinforced concrete column 12 Column main bar 12a Lower main bar 12b Upper main bar 14, 14a Inner iron plate 16, 16a Outer iron plate 18 Partition iron plate 20 Iron plate

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int.Cl. ⁶ , DB name) E04B 1/16 E04B 1/58

Claims (2)

(57) [Scope of request for utility model registration] A large number of reinforced concrete main reinforcements to be joined to each other are vertically overlapped with each other and overlapped with each other, and the inner and outer peripheries of the entirety of the main reinforcements of the overlapped portions are surrounded by inner and outer iron plates. The inner and outer iron plates are defined by a plurality of partition iron plates at appropriate intervals, and a plurality of pairs of lap joints of the main bar are divided into small groups inside the inner and outer iron plates and the partition iron plate. Joint structure of reinforced concrete columns characterized by restraint. 2. A spliced with each other in a number of pillars main reinforcements each other the upper and lower pairs of reinforced concrete to be joined to each other, divide the lap joints with pillars main reinforcement in pairs by a small group,
A joint structure for a reinforced concrete column, characterized in that the spliced portion of each small group is surrounded and restrained by an independent iron plate.