JP3170997B2 - Steel tube unit of steel tube concrete column with reinforced cage - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel pipe unit of a steel pipe concrete column having a reinforcing cage .

[0002]

2. Description of the Related Art In steel pipe concrete columns made by casting concrete in steel pipes, it is widely used to insert a reinforcing bar in order to improve the proof strength and the fire resistance.
-25622).

When such steel pipe concrete columns are used for a structure, the steel pipe concrete columns are sometimes connected to each other to have a predetermined length. At that time, it is necessary to connect the reinforcing steel bars in order to surely transmit the stress between the connected steel pipe-concrete columns. Regarding the connection type of the rebar itself,
For reinforced concrete columns that do not use steel pipes, for example,
Connection types such as lap joints, welded joints, and sleeve joints are known (see Architectural Institute of Japan, "Guidelines for Reinforced Concrete Reinforcing Bars, same description", pp. 122-128).

[0004] The lap joint is formed such that the reinforcing steel bars of two steel pipe concrete columns to be connected each have an overlapping portion with each other. This overlapped portion can be connected with a member or the like as required, if necessary.

[0005] A welded joint is a joint in which rebars are butted one by one and the ends are welded to each other.

[0006] In the sleeve joint, instead of welding, ends of reinforcing bars are joined by fitting a sleeve member.

In order to apply such a joint type to a steel pipe concrete column, concrete is filled in the steel pipe after connecting the rebar according to the above procedure, and a steel pipe concrete column of a desired length is obtained. Become.

[0008]

However, in each of the above-mentioned joint types, in addition to the problem that an operator must manually connect each reinforcing bar manually, which is time-consuming in addition to the above problem. When applying to steel pipe-concrete columns, the following problems arise further because the rebar joints are invisible and inaccessible because the surroundings are covered with steel pipes. It is difficult to form a reliable rebar joint.

That is, in the case of a lap joint, since the overlapped portion is completely covered with the steel pipe and cannot be seen, the reinforcing bars may abut against each other and may not be arranged properly. Also, the welded joint cannot be applied to steel pipe concrete columns because it cannot be welded by being interrupted by steel pipes.
If it were to be applied, a device with a very special tool would be required.

In the case of a sleeve joint, when joining a steel pipe,
It is necessary to insert the other reinforcing bar end into the sleeve attached to one reinforcing bar end. However, in normal construction, since the height of one pillar is two to three floors (7 to 10 m) high, there is a major problem such as difficulty in positioning the reinforcing bars.

[0011] In many cases, the above-mentioned rebar is assembled by actual work, and it is necessary to insert rebar into the steel pipe at a construction site with insufficient facilities and to perform complicated work for connecting a rebar joint. And the work itself is inefficient.

The present invention solves the above problem, and provides a steel pipe unit of a steel pipe concrete column having a steel cage which can be easily connected to a steel pipe without requiring special equipment and the like even in a steel pipe. The purpose is to do.

[0013]

SUMMARY OF THE INVENTION The object of the present invention is to provide a tubular steel reinforced cage in a steel pipe, and to connect the steel pipes in the longitudinal direction, and then to put concrete in the steel pipe. forming the steel pipe units of steel concrete column having a reinforcing bar cage is pouring, reinforcing bar cage is to enable overlay the ends of the reinforcing bar cage between when connecting steel pipes, than the steel pipe by a predetermined length longer Along with
The outer diameter of one end of the reinforcing rod is smaller than the inner diameter of the other end, and the connecting rod is immersed from at least one end face of the steel pipe before connecting the steel pipes . This is achieved by having a rebar basket characterized in that:

[I] The reinforcing rod cage is formed longer than the steel pipe by a predetermined length so that the ends of the reinforcing rod cages can be overlapped when connecting the steel pipes. Outside diameter is smaller than the inside diameter of the other end ,
Reinforcing cage is immersed from at least one end face of steel pipe
It is.

[II] The reinforcing rod cage is substantially the same length as the steel pipe, and the outer diameter of one end is smaller than the outer diameter of the other end. When connecting the steel pipes, the ends of the reinforcing rods are overlapped. A rebar cage joint for forming and connecting a mating portion, wherein an outer diameter of one end of the rebar cage is smaller than an inner diameter of the other end of the rebar cage, and an inner diameter of the other end is one end of the rebar cage. Are formed so as to be larger than the outer diameter of
It is located immersed from the end face .

[III] The reinforcing rod cage is substantially the same length as the steel pipe, and the outer diameter of both ends is formed smaller than the outer diameter of the middle part. When connecting the steel pipes, the ends of the reinforcing rod baskets are overlapped. A rebar cage joint for forming and connecting portions, the rebar cage joint having an inner diameter formed to be larger than the outer diameters of both ends of the rebar cage, and the rebar cage having at least one end face of the steel pipe;
It is immersed and located .

[0017]

In the present invention having the above-described structure, the connection of the steel pipe concrete columns is performed in the following manner.

A reinforced basket is set in a steel pipe to form a set.

The two steel pipes in which the reinforcing bar cages are set as described above are superposed in the longitudinal direction. Thus, the rebar baskets in the two steel pipes form an overlapping portion.

Thereafter, the steel pipes are connected to each other by welding or the like, and concrete is poured into the steel pipes to obtain steel pipe concrete columns having a desired length.

[0021]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

<First Embodiment> In FIG. 1, reference numeral 1 denotes a steel pipe. In this embodiment, the steel pipe 1 is a cylindrical body having a circular cross section as shown in FIG. 2. However, the present invention is not limited to this. The steel pipe 1
Inside, a steel cage 2 is provided. The reinforcing rod cage 2 includes a plurality of vertical members 3 arranged in parallel along the peripheral surface of the steel pipe 1.
And an annular member 4 for connecting the vertical member 3 at a plurality of positions in the longitudinal direction to form a cylindrical basket. The rebar basket 2 is not limited to the illustrated vertical member 3 and annular member 4, but is formed in a basket shape by connecting the vertical member and the annular member to each other on a cylindrical surface along the peripheral surface of the steel pipe 1. I just want to. For example, the annular member is not limited to a plurality of annular bodies, but may be a single strip member spirally wound around the vertical member 3.

The reinforcing bar 2 has a length L from the upper end of the steel pipe 1.
The outer diameter d is smaller than the inner diameter D of the portion housed in the steel pipe 1.
Is formed. The protruding length L is a state in which, when the reinforcing cages 2 are connected to each other in the steel pipe 1, a small-diameter portion having an outer diameter d of the other reinforcing cage 2 is inserted into a large-diameter portion forming the inner diameter D of one reinforcing cage 2. Is set to such an extent that sufficient reinforcement is made at the connecting portions between the reinforcing bars 2. Therefore, it depends on the cross-sectional shape and dimensions of the reinforcing bar, the form of the reinforcing bar cage, and the like.
It is set to be 5 to 40 times.

In this embodiment, the connection of the steel pipe concrete columns is performed in the following manner. In FIG. 3,
The reference numerals used in FIGS. 1 and 2 for two identical members connected to one another, A for one member and B for the other member
Are attached to distinguish between the two members.

First, the reinforcing rod cage 2A is inserted into one steel pipe 1A in advance and arranged at a predetermined position. The rebar cage 2A has a small diameter portion protruding above the steel pipe 1A by a length L shown in FIG.

Next, another steel pipe 1B in which the reinforcing rod cage 2B is inserted and mounted in advance is disposed on the steel pipe 1A, and the two are connected by welding or the like.

Thus, after the steel pipes with the reinforcing bars are connected to the predetermined height one after another, concrete is poured into the steel pipes 1A and 1B to obtain concrete columns of a desired length. FIG. 4 shows a steel pipe having a cylindrical shape in the section taken along line IV-IV in FIG. 3. However, the present invention can be similarly applied to a rectangular steel pipe as shown in FIG.

In FIG. 1, the reinforcing rod 2 is arranged such that the lower end thereof is at the same level as the lower end of the steel pipe 1 and the upper end (small diameter part) protrudes from the steel pipe 1. In this embodiment, such an arrangement is employed. 6, 7 and 8, each of the two ends of the reinforcing rod cage 2 is projected from the steel pipe 1, or one end forming the small diameter portion is largely projected and the other end is slightly immersed. Further, conversely, even if one end is slightly immersed and the other end is greatly protruded, only the position of the connecting portion between the reinforcing bar cages moves with respect to the position of the connecting portion of the steel pipe, and when concrete is poured, There is no significant difference in the connection strength between the steel cages. <Second Embodiment> In the previous embodiment, the rebar basket was formed to be longer than the steel pipe. On the other hand, the present embodiment is characterized in that both are formed to have substantially the same length. In this embodiment, the reinforcing rod cage is connected by a reinforcing rod joint.

As shown in FIG. 9, the reinforcing rod cage 2 of the present embodiment is formed to have substantially the same length as the steel pipe 1.
As in the case of the previous embodiment shown in FIG. 1, the upper end has a small diameter portion.

In addition, in this embodiment, a rebar cage joint 7 as shown in FIG. 10 is used. The steel cage joint 7
Has a shape and dimensions in which an intermediate portion of the reinforcing bar 2 is omitted and shortened, and an upper end portion and a lower end portion are integrally formed.

In this embodiment, as shown in FIG.
After arranging the rebar cage joint 7 on the rebar basket 2A disposed in the steel pipe 1A so as to overlap the steel pipe 1A, the steel pipe 1A is connected to the steel pipe 1B to which the rebar basket 2B is previously inserted and attached, and the steel pipe 1A and Concrete is poured into 1B to obtain a steel pipe concrete column. Also in this embodiment, the steel cage and the steel cage joint are simply fastened or kept in contact with each other at a transition portion to a small diameter portion, for example, so as to maintain a predetermined position on the steel pipe before concrete casting. Shapes and dimensions that can be supported at predetermined positions can also be used.

<Third Embodiment> This embodiment is the same as the second embodiment in that the reinforcing rod cage 2 has substantially the same length as the steel pipe 1, but the upper and lower ends of the reinforcing rod cage have small diameter portions. Is different.

In FIG. 12, the reinforcing rod cage 2 disposed in the steel pipe 1 is vertically symmetrical, and has small diameter portions at the upper and lower ends. As shown in FIG. 13, the rebar cage joint 8 for connecting the rebar cage 2 has a single diameter substantially the same as the middle portion of the rebar cage 2 and is short. In this embodiment, since both the reinforcing bar cage 2 and the reinforcing bar cage joint 8 can be vertically symmetrical, there is an advantage that it is not necessary to pay attention to the arrangement in the vertical direction during use.

Also in this embodiment, connection is made as shown in FIG. 14 in the manner of the second embodiment.

[0035]

As described above, according to the present invention, when connecting steel pipe concrete columns, the reinforcing rods arranged in the steel pipe are formed into a cylindrical basket, and the upper and lower ends of the reinforcing rod basket can be overlapped and inserted. Therefore, the reinforcing steel cage of the next steel pipe is arranged on the reinforcing steel basket in the steel pipe, an overlapping portion is formed, and sufficient reinforcement is achieved by casting concrete. Only
Also, in the present invention , before the steel cage is connected to the steel pipe, one end of the steel pipe is connected.
Since it is immersed from the steel pipe and the unit is formed,
There is an effect that a steel pipe concrete column having a simple connection operation and high strength is obtained and handling is convenient .

[Brief description of the drawings]

FIG. 1 is a sectional view of a steel pipe and a steel cage according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a cross-sectional view when the components of FIG. 1 are connected.

FIG. 4 is a sectional view taken along line IV-IV in FIG. 3;

FIG. 5 is a view showing a modification of the sectional shape of FIG. 3;

FIG. 6 is a cross-sectional view of a steel pipe and a steel cage as a modification of the first embodiment.

FIG. 7 is a cross-sectional view of a steel pipe and a reinforcing cage showing a modification of the first embodiment.

FIG. 8 is a cross-sectional view of a steel pipe and a reinforcing cage showing another modification of the first embodiment.

FIG. 9 is a sectional view of a steel pipe and a reinforcing rod cage according to the second embodiment.

FIG. 10 is a sectional view of a reinforcing bar cage joint used for connecting the one shown in FIG. 9;

FIG. 11 is a cross-sectional view when FIG. 9 is connected using the rebar cage joint of FIG. 10;

FIG. 12 is a sectional view of a steel pipe and a reinforcing rod cage according to a third embodiment.

FIG. 13 is a cross-sectional view of a rebar cage joint used for connection of FIG.

FIG. 14 is a cross-sectional view when the one in FIG. 12 is connected using the rebar cage joint of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Steel pipe 2 Reinforced cage 7 Reinforced cage joint 8 Reinforced cage joint

Continuation of the front page (56) References JP-A-59-102049 (JP, A) Jikken 46-3312 (JP, Y1) (58) Fields investigated (Int. Cl. ⁷ , DB name) E04B 1 / 30 E04B 1/58 503 E04C 5/00-5/20

Claims (1)

(57) [Claims] 1. A steel pipe unit of a steel column concrete column having a steel cage having a steel cage in which a steel frame having a cylindrical frame is disposed in a steel pipe, and concrete is poured into the steel pipe after connecting the steel pipes in the longitudinal direction. , reinforcing bar cage is to enable overlay the ends of the reinforcing bar cage between when connecting steel pipes, along with being longer than the steel pipe by a predetermined length,
The outer diameter of one end of the reinforcing rod is smaller than the inner diameter of the other end, and the connecting rod is immersed from at least one end face of the steel pipe before connecting the steel pipes . A steel pipe unit of a steel pipe concrete column having a reinforcing bar cage .