JP2578673B2 - Building construction method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for constructing a skeleton composed of reinforced concrete columns and steel beams.

"Conventional technology" Conventionally, reinforced concrete columns (RC columns) and steel beams (S
Various methods are known as a method of constructing a skeleton composed of a combination with a pillar.

As a normal construction method, a formwork is set in advance around a reinforced concrete column to be formed, a column reinforcing bar is arranged inside the formwork, and concrete is poured into the formwork to form a reinforced concrete column. Then, a steel beam is joined to the joint of the reinforced concrete column by bolts, welding, etc. to construct a skeleton, and after removing the formwork, only the steel beam is provided with a fireproof coating as a fire safety measure. ing.

"Problems to be Solved by the Invention" However, in the above-mentioned conventional method, when forming a reinforced concrete column, a formwork for concrete placement is required, and after the concrete placement, it is necessary to remove the formwork. In order to reduce the construction cost, how to handle the disposal of the formwork is required in order to reduce the construction cost because the removal work of the formwork member, the removal cost is required, and the formwork member can not be diverted and it becomes disposable. It is a problem.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a method of constructing a skeleton that can eliminate the work of removing a formwork for concrete casting and can reduce the construction cost. I have.

“Means for Solving the Problems” The present invention constructs a building frame of a structure in which a reinforced concrete column and a steel frame beam are joined via a joint unit arranged at the joint. A thin steel pipe which is to be a discarded formwork for forming a column body portion between the upper and lower joints, and a steel bar is arranged inside the steel pipe before and after that, and the thin steel pipe is provided. A reinforced concrete column having the thin-walled steel pipe as a finishing material is formed by casting concrete into the inside of the inside, and the connection unit is formed of a steel pipe having substantially the same diameter as the thin-walled steel pipe. The reinforcing bar is constituted by a cover plate serving as a discarding formwork of a connection portion, and upper and lower ring members fixed to the upper and lower sides of the cover plate and joined to upper and lower flanges of a steel beam, respectively. Ko When forming concrete columns, the joint unit is arranged in the joint and connected between upper and lower thin steel pipes, and the column reinforcing bar is inserted into the joint unit and concrete is filled. By doing so, the joint unit is integrated with the reinforced concrete column, the steel beam is joined to the joint unit, and a fireproof coating is applied to the steel beam and the joint unit. It was made.

According to the present invention, by joining a reinforced concrete column and a steel beam via a connection unit disposed at the connection, the column and the beam are firmly and easily connected. Joined to. Then, the thin steel pipe is used as a discarding frame in the column body between the upper and lower ports, and the thin steel pipe also serves as a finishing material of the column. The removal of the frame is not required, and the steps and costs required for removing the formwork are eliminated, leading to a reduction in the construction cost. Further, the thin-walled steel pipe needs to be thin enough to maintain the function as a formwork and does not constitute a part of the structure. Therefore, it is not necessary to apply a fireproof coating, and this also leads to a reduction in construction cost.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 to 3 show an embodiment of the present invention. In these figures, reference numeral 1 denotes a reinforced concrete column (hereinafter referred to as RC column), and reference numeral 2 denotes a steel beam.

As shown in FIG. 1, the RC column 1 is composed mainly of concrete C and column reinforcements 3 are buried therein. A thin steel pipe 4 for a dumping formwork at the time of concrete casting is provided around the concrete C. RC pillar 1 on the pillar 6 between the upper and lower joints 5, 5
Is provided as a side outer peripheral portion. That is, the above thin steel pipe 4 is not only used as
It also serves as the finishing material for RC column 1. In addition, the column 3
Is a plurality of main reinforcements 7 extending in the longitudinal direction,
And the abdominal muscles 8 wound around.

In the RC column 1, a connection unit 9 for connecting a beam is attached to the connection 5, and the connection unit 9 is provided at the lower end and the upper end of the thin steel pipe 4 facing up and down in the connection 5. Each is welded, upper and lower ring members 10 and 11 fixed by bolts, and each ring member 10 and 11 are integrally configured from a cover plate 12 that connects and connects each other around, as the cover plate 12 described above As shown in FIGS. 1 and 2, a steel pipe having substantially the same diameter as the thin steel pipe 4 is used.

The steel beam 2 is connected to the side surface of the RC column 1 at the connection portion 5 via the connection portion unit 9 and is composed of upper and lower flanges 13 and 14 and a web material 15 therebetween. . As shown in FIGS. 1 and 2, each end of the upper and lower flanges 13 and 14 is welded to the ends of the upper and lower ring members 10 and 11 of the connection unit 9 by means of welding and bolts. By being connected, it is connected to the side surface of the RC column 1.

As shown in FIG. 3, a concrete floor slab 16 is formed on the upper surface of the steel beam 2, and a fire-resistant coating such as rock wool is formed on the outer surface of the steel beam 2 and the outer surface of the cover plate 12 of the connection unit 9. 17 is applied, and the outside of the thin steel pipe 4 is not provided with a fireproof coating.

Next, the construction method of the skeleton including the RC columns 1 and the steel beams 2 configured as described above will be described in the order of construction.

First, when the RC column 1 is formed on site, the connection unit 9 is fixed to the lower end portion of the thin steel pipe 4 in advance by welding or the like, and the column main bar 3 rising from the existing skeleton portion is The thin-walled steel pipe 4 with the connection unit is built in a manner to be inserted. Next, by fixing the ends of the upper and lower flanges 13 and 14 to the ring members 10 and 11 by welding or the like, the steel beam 2 is attached to the joint unit 9 and is stabilized. Thereafter, the column main bar 3 of the column body 6 is lowered from the upper portion into the thin steel tube 4 and lap-joined to the column main bar 3 rising from the lower portion to form an integral column main bar 3. Thereafter, the inside of the thin steel tube 4 and the connection unit unit 9 are formed. Pour concrete C inside. At the same time, concrete C is cast on the upper surface of the steel beam 2 via a mold to form a concrete floor slab 16.

In addition to the above-described method, a method of disposing the column main reinforcing bar 3 in which the column main reinforcing bar 3 is disposed inside the thin-walled steel pipe 4 with the connection unit may be used. The main reinforcement 3 of the column body 6 is first wrap-joined to the main reinforcement 3 standing up from the existing skeleton, and the thin steel pipe 4 with the joint unit is formed. There is a way to build it later.

Further, as described above, the work is not limited to one layer, and a thin steel pipe 4 having a plurality of floors and having a plurality of connection units 9 may be used. In this case, the thin-walled steel pipes 4 with the joint units are built on the existing skeleton by the above-described means, and the steel beams 2 are laid on the thin-walled steel pipes 4. There is also a method in which the main column 3 is erected from the top of the steel pipe 4 and then concrete is poured from the top using a tremy tube or the like.

Finally, a fire-resistant coating is applied to the outer surface of the steel beam 2 as a structure and the cover plate 12 of the connection unit 9 with a fire-resistant material 17 such as rock wool. In addition, the thin-walled steel pipe 4 on the outer surface of the column 6 of the RC column 1 is used only as a disposal form and a finishing material, and does not constitute a part of the structure. I do.

In this way, a skeleton is constructed for each floor or for multiple floors.

According to this embodiment, the thin steel pipe 4 is connected to the column 6 of the RC column 1.
It is used as a discarding formwork for concrete casting of concrete, and after casting, it is used as it is as a finishing material that constitutes the outer surface of RC column 1, so there is no need to remove the formwork as in the past, and it is necessary to remove the formwork Time and cost are unnecessary. Therefore, it is possible to reduce the frame work and the construction cost.

Further, since the thin steel pipe 4 is used only as a waste form and a finishing material, and there is no idea that the thin steel pipe 4 is used as a part of the structure of the RC column 1, the thin steel pipe 4 may be used as a column such as a filled steel pipe concrete column. Therefore, the refractory coating only needs to be performed on the steel beam 2 and the connection unit 9 to which the steel beam 2 is connected, so that the refractory coating operation can be omitted. In this way, shortening of frame work can be expected. In addition, since the thin steel pipe 4 may be formed to have a sufficient thickness as a mold for concrete casting, wasteful materials can be reduced, and further, it can be used as an exterior material that also serves as the mold. Available.

In addition, it is also possible to use the thin steel pipe 4 for reinforcement of the RC column 1, and in this case, it is optional to apply a fireproof coating to the outer surface of the thin steel pipe 4.

[Effects of the Invention] As described in detail above, according to the present invention, by joining a reinforced concrete column and a steel frame beam via a joint unit arranged at their joints,
In addition to being able to join these columns and beams firmly and easily, a thin steel pipe that serves as a discarding formwork for forming the column body between the upper and lower connections is built in, and at the same time, To form a reinforced concrete column having the thin steel pipe as a finishing material by placing concrete inside the thin steel pipe, and as the joint unit, the thin steel pipe A cover plate formed of a steel pipe having substantially the same diameter as the cover plate serving as a waste form of the connection portion, and upper and lower ring members respectively fixed to the upper and lower portions of the cover plate and joined to the upper and lower flanges of the steel beam. When forming the reinforced concrete column, the joint unit is arranged in the joint and connected between the upper and lower thin steel pipes, and the joint is formed. By inserting the column rebar into the interior of the unit and filling with concrete, the joint unit is integrated with the reinforced concrete column, and the steel beam is joined to the joint unit and Since the fireproof coating is applied to the beam and the joint unit, it is not necessary to remove the formwork in the pillar of the reinforced concrete column, and the fireproof coating on the outer surface of the thin-walled steel pipe is not required. It is possible to reduce the number of construction steps and the construction cost, and furthermore, since the thin steel pipe also serves as a finishing material for the pillar, it is possible to simplify the finishing work and reduce the cost.

[Brief description of the drawings]

1 to 3 show an embodiment of the present invention. FIGS. 1 and 2 are vertical and horizontal sectional views showing a connecting portion between a reinforced concrete column and a steel beam, and FIG. It is a side view. DESCRIPTION OF SYMBOLS 1 ... Reinforced concrete column, 2 ... Steel beam, 3 ... Column reinforcement, 4 ... Thin steel pipe, 5 ... Connection part, 6 ... Column body part, 9
… Connection unit, 10, 11… Ring member, 12… Cover plate, 17… Fireproof coating.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yoshinori Murai 2-16-1, Kyobashi, Chuo-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Noboru Sakaguchi 2-16-1, Kyobashi, Chuo-ku, Tokyo Shimizu Construction Inside (72) Inventor Yutaka Saito 2-16-1 Kyobashi, Chuo-ku, Tokyo Shimizu Corporation Inside (56) References JP-B-60-18785 (JP, B2)

Claims (1)

(57) [Claims] 1. A method of constructing a building body having a structure in which a reinforced concrete column and a steel frame beam are joined via a joint unit disposed at the joint, comprising: A thin-walled steel pipe to be used as a discarded formwork for forming the column body between the mouths will be built, and before and after that, a steel bar will be arranged inside, and concrete will be cast inside the thin-walled steel pipe. In this way, a reinforced concrete column having the thin steel pipe as a finishing material is formed, and the joint unit is formed of a steel pipe having substantially the same diameter as the thin steel pipe, and a joint form frame of the joint is provided. And the upper and lower ring members, which are respectively fixed to the upper and lower portions of the cover plate and are connected to the upper and lower flanges of the steel beam, respectively, to form the reinforced concrete column. Then, by arranging the joint unit in the joint and connecting between the upper and lower thin steel pipes, by inserting the column rebar into the interior of the joint unit and filling with concrete, The joint unit is integrated with the reinforced concrete column, the steel beams are joined to the joint unit, and a fireproof coating is applied to the steel beams and the joint unit. Construction method of frame.