JP7628830B2 - Construction method for column-beam joint structure - Google Patents

Description

The present invention relates to a method for constructing a beam-column joint structure.

A joint structure between a concrete-filled steel pipe column, in which the inside of the steel pipe is filled with connecting rebars (main bars) and concrete, and a steel-framed beam arranged above and below the concrete-filled steel pipe column has been known.

The following Patent Document 1 proposes a concrete-filled steel pipe column with a reinforcing steel body arranged inside. The reinforcing steel body has multiple vertical reinforcing bars that extend vertically and are arranged at intervals along the circumferential direction, and multiple shear reinforcing bars (circular reinforcing bars) that are circular in plan view and arranged at intervals in the vertical direction to bundle the multiple vertical reinforcing bars. Even if the steel pipe becomes hot during a fire and the restraining effect of the steel pipe is greatly reduced, the reinforcing steel body can ensure the shear transmission performance and axial force transmission performance of the column.

JP 2018-131770 A

However, when pouring concrete from the top of a beam-column joint (joint) into the steel pipe of the lower column and into the plug plate, the presence of the steel beam and the connecting rebar at the joint poses the problem of significantly reducing the efficiency of the concrete pouring work and taking time. In addition, because concrete is poured into the steel pipe of the lower column and into the plug plate at the same time, the work of filling the plug plate in particular is often difficult. When pouring concrete from the top of the joint, the connecting rebar is only simply fixed with binding wires, etc., so if the connecting rebar shifts from its designated position during pouring, post-concrete work is required to return it to its designated position, which is time-consuming.

In addition, when the pillars are tall, it is necessary to use concrete hoses, but a normal-sized concrete pouring hose often cannot fit through the gaps between the flanges of the beams that cross at right angles at the joint, making it necessary to reduce the diameter of the concrete pouring hose. This can result in a significant decrease in the efficiency of concrete pouring, or even make pouring concrete itself difficult.

In addition, when pouring concrete into the steel pipe of the lower column, pouring work must be done from the top of the joint, so the upper column steel pipe erection work must be done after the lower concrete pouring work, which creates the problem of reduced freedom in process selection.

Therefore, the present invention has been made in consideration of the above circumstances, and provides a construction method for a column-beam joint structure that allows concrete pouring work to be easily performed.

In order to achieve the above object, the present invention employs the following means.
In other words, the construction method of the column-beam joint structure of the present invention is a construction method of a column-beam joint structure between a column of concrete-filled steel pipe construction and a beam of steel frame construction, and includes the following steps: a lower steel pipe installation step of installing a lower steel pipe so as to extend in the vertical direction; a connecting member installation step of arranging a connecting member having a plurality of connecting rebars extending in the vertical direction, a plugging steel pipe arranged to surround the outside of the vertical middle of the plurality of connecting rebars, a connecting concrete portion filled inside the plugging steel pipe, and a connecting beam connected to the plugging steel pipe, coaxially installing the plugging steel pipe above the lower steel pipe; an upper steel pipe installation step of installing an upper steel pipe coaxially above the plugging steel pipe; and a lower steel pipe concrete pouring step of pouring concrete from a pouring hole formed in the upper part of the lower steel pipe so as to penetrate the plate thickness of the lower steel pipe.

In the construction method for a beam-column joint structure configured in this way, in the joint member installation process, a joint member with a joint concrete portion filled inside the plugging steel pipe is installed above the lower steel pipe. In the lower steel pipe concrete pouring process, concrete is poured inside the lower steel pipe, and there is no need to fill the plugging steel pipe because it is already filled with concrete. This makes it easy to pour the concrete.

The method for constructing a beam-column joint structure according to the present invention may also include a casting pipe installation step in which one end of a cylindrical casting pipe is connected to the casting hole and the other end of the casting pipe is installed so as to face upward.

In the construction method for a beam-column joint structure configured in this way, a pouring pipe is connected to a pouring hole formed in the upper part of the lower steel pipe, and concrete is poured into the lower steel pipe from the other end of the pouring pipe facing upward. This allows concrete to be poured from above the lower steel pipe, making pouring concrete easy.

The construction method for a beam-column joint structure according to the present invention may also include a concrete compaction process in which a vibrator is inserted into a working hole formed in the upper part of the lower steel pipe so as to penetrate the plate thickness of the lower steel pipe, and the concrete poured in the lower steel pipe is vibrated to compact it.

In the construction method for a beam-column joint structure configured in this way, a vibrator that vibrates and compacts the concrete poured into the lower steel pipe is inserted through a work hole formed in the upper part of the lower steel pipe. Therefore, since there is a work hole for inserting the vibrator in addition to the pouring hole for pouring the concrete, the workability of compacting the concrete is good.

The method for constructing a beam-column joint structure according to the present invention may also include a work pipe installation process in which one end of a cylindrically formed work pipe is connected to the work hole and the other end of the work pipe is installed so as to face upward.

In this construction method for a beam-column joint structure, a work pipe can be connected to a work hole formed in the upper part of the lower steel pipe, and a vibrator can be inserted from the other end of the work pipe facing upward, making it easier to compact the concrete.

The construction method for a beam-column joint structure according to the present invention may also include a concrete checking process for checking the concrete poured into the lower steel pipe from the other end of the work pipe.

In this construction method for a beam-column joint structure, the working pipe used for compacting the concrete can be used to check the concrete poured into the lower steel pipe, eliminating the need to drill a separate inspection hole for checking the concrete.

According to the construction method for a column-beam joint structure of the present invention, concrete pouring work can be easily carried out.

1 is a vertical cross-sectional view showing a column-beam joint structure according to one embodiment of the present invention. 2 is a cross-sectional view taken along line AA in FIG. 1. 1 is a diagram showing a construction method for a beam-column joint structure according to one embodiment of the present invention, illustrating the joint member assembly process. 4 is a diagram showing a construction method for a column-beam joint structure according to one embodiment of the present invention, showing a joint member assembly process, which is a process subsequent to that shown in FIG. 3 . 1 is a diagram showing a construction method for a column-beam joint structure according to one embodiment of the present invention, illustrating a lower steel pipe installation process and a joint member installation process. FIG. 1 is a diagram showing a construction method for a column-beam joint structure according to one embodiment of the present invention, illustrating the upper steel pipe installation process. This is a diagram showing a construction method for a column-beam joint structure according to one embodiment of the present invention, and shows the pouring pipe installation process, the working pipe installation process, the lower steel pipe concrete pouring process, and the concrete compaction process. 1 is a diagram showing a construction method for a column-beam joint structure according to one embodiment of the present invention, illustrating a concrete inspection process.

A construction method for a beam-column joint structure according to one embodiment of the present invention will be described with reference to the drawings.
First, the configuration of the column-beam joint structure will be described.
Fig. 1 is a vertical cross-sectional view showing a column-beam joint structure according to an embodiment of the present invention. As shown in Fig. 1, the column-beam joint structure 100 of this embodiment is a joint structure between a column 1 of a concrete-filled steel pipe construction (CFT construction) and a beam 2 of a steel frame construction (S construction). The column-beam joint structure 100 of this embodiment has a column member 1A, a beam member 2A, and a column-beam joint member (joint member) 3.

The column members 1A are arranged above and below the column-beam joint member 3. The column members 1A have a steel pipe 11 and a column concrete section 12. The steel pipe 11 is formed in a cylindrical shape. The axis of the steel pipe 11 faces vertically. The column concrete section 12 is filled inside the steel pipe 11. The steel pipe 11 of the lower column member 1A is referred to as the lower steel pipe 11a. The steel pipe 11 of the upper column member 1A is referred to as the upper steel pipe 11b.

A casting hole 51 is formed in the upper part of the lower steel pipe 11a so as to penetrate the plate thickness of the lower steel pipe 11a. One end 52a of a cylindrical casting pipe 52 is connected to the casting hole 51. The casting hole 51 and the casting pipe 52 are connected. The casting pipe 52 extends outside and upward of the lower steel pipe 11a. The other end 52b of the casting pipe 52 is arranged to face upward. The inside of the casting pipe 52 is also filled with the column concrete section 12. The column concrete section 12 is filled to a position slightly lower than the other end 52b of the casting pipe 52.

A work hole 56 is formed in the upper part of the lower steel pipe 11a so as to penetrate the plate thickness of the lower steel pipe 11a. One end 57a of a cylindrically formed work pipe 57 is connected to the work hole 56. The work hole 56 and the work pipe 57 are connected to each other. The work pipe 57 extends outside and upward from the lower steel pipe 11a. The other end 57b of the work pipe 57 is arranged to face upward. The inside of the work pipe 57 is also filled with the column concrete section 12. The column concrete section 12 is filled to a position slightly lower than the other end 57b of the work pipe 57.

The beam member 2A is connected to the longitudinal end of the joining beam 34 (described later) of the beam-column joining member 3. The beam member 2A is arranged in a cross shape in a plan view. The beam member 2A is made of H-shaped steel. The beam member 2A has a pair of flanges 21 and a web 22. The pair of flanges 21 are arranged spaced apart in the vertical direction. The web 22 connects the pair of flanges 21 to each other.

The column-beam joint member 3 comprises a sealing steel pipe 31, a joint reinforcing bar 32, a joint concrete section 33, and a joint beam 34.

The plugging steel pipe 31 has four steel pipe plate materials 31a arranged between the joint webs 34b of the orthogonally arranged joint beams 34 described below. The plugging steel pipe 31 is formed into a substantially cylindrical shape by the four steel pipe plate materials 31a. The axis of the plugging steel pipe 31 is oriented vertically. The plugging steel pipe 31 is arranged between the steel pipes 11 of the upper and lower column members 1A. The diameter of the plugging steel pipe 31 is substantially the same as the diameter of the steel pipe 11. The plugging steel pipe 31 is arranged coaxially with the steel pipe 11.

The connecting rebars 32 extend vertically. Figure 2 is a cross-sectional view of line A-A in Figure 1. As shown in Figure 2, multiple connecting rebars 32 are arranged inside the sealing steel pipe 31. The multiple connecting rebars 32 are arranged with intervals in the circumferential direction. The connecting rebars 32 are arranged in positions that do not interfere with the connecting beams 34 described below.

As shown in FIG. 1, the portion of the connecting rebar 32 that protrudes above the filling steel pipe 31 is called the upper protruding rebar 32a. The upper protruding rebar 32a is disposed inside the upper steel pipe 11b. The upper protruding rebar 32a is fixed to the column concrete portion 12 filled inside the upper steel pipe 11b.

The portion of the connecting rebar 32 that is placed inside the plugging steel pipe 31 is called the intermediate rebar 32b. The plugging steel pipe 31 is placed so as to surround the outside of the intermediate rebar 32b, which is the vertical center of the connecting rebar 32. The intermediate rebar 32b is fixed to the connecting concrete portion 33, which will be described later.

The portion of the connecting rebar 32 that protrudes downward from the filling steel pipe 31 is called the lower protruding rebar 32c. The lower protruding rebar 32c is disposed inside the lower steel pipe 11a. The lower protruding rebar 32c is fixed to the column concrete portion 12 filled inside the lower steel pipe 11a.

The joint concrete section 33 is filled inside the sealing steel pipe 31. Four joint beams 34 are arranged perpendicular to each other in a cross shape when viewed from above. The joint beams 34 are made of H-shaped steel. The joint beams 34 have a pair of joint flanges 34a and a joint web 34b. The pair of joint flanges 34a are arranged spaced apart in the vertical direction. The joint web 34b connects the pair of joint flanges 34a to each other. The joint web 34b is joined to the sealing steel pipe 31.

The flange 21 of the beam 2 is joined to the end of the joint flange 34a in the longitudinal direction. The web 22 of the beam 2 is joined to the end of the joint web 34b in the longitudinal direction.

The upper column 1 has an upper steel pipe 11b, an upper protruding rebar 32a, and a column concrete section 12. The lower column 1 has a lower steel pipe 11a, a lower protruding rebar 32c, and a column concrete section 12. The beam 2 has a beam member 2A and a joint beam 34. The upper and lower columns 1 and beams 2 are joined by a filling steel pipe 31, an intermediate rebar 32b, and a joint concrete section 33.

Next, a construction method for the column-beam joint structure will be described.
The joining member assembly process is carried out.
As shown in Fig. 3, a temporary lower steel frame 41 is erected on a work surface g. The temporary lower steel frame 41 is preferably arranged below four locations where the connection beams 34 of the column-beam connection members 3 to be arranged in a later process will be arranged. The four connection beams 34 are arranged orthogonally. The orthogonally arranged connection beams 34 are joined with steel pipe plate materials 31a to form the sealing steel pipes 31.

As shown in FIG. 4, a temporary upper steel frame 42 is installed on the connecting beam 34. For example, the temporary upper steel frame 42 is placed vertically above the temporary lower steel frame 41. A lower rebar support base 43 is installed on the work surface g inside the interior surrounded by the multiple temporary lower steel frames 41. An upper rebar support base 44 is installed so as to be erected on the multiple temporary upper steel frames 42. A plurality of connecting rebars 32 are placed inside the sealing steel pipe 31. For example, the upper and lower ends of the connecting rebars 32 are inserted into support holes formed so as to penetrate the upper rebar support base 44 and the lower rebar support base 43 in the vertical direction to position the connecting rebars 32. A formwork (not shown) is installed at the bottom of the sealing steel pipe 31, and concrete is poured inside the sealing steel pipe 31 to form the connecting concrete portion 33. This completes the column-beam connecting member 3. The joint member assembly process may be carried out in advance at a manufacturing factory or the like to manufacture the column-beam joint member 3 and then transported to the construction site, or the joint member assembly process may be carried out at the construction site to manufacture the column-beam joint member 3.

The lower steel pipe installation process is carried out.
As shown in FIG. 5, the lower steel pipe 11a is placed on the placement surface h so that the lower steel pipe 11a extends in the vertical direction, that is, so that the axis of the lower steel pipe 11a faces the vertical direction.

A joining member installation process is carried out.
The column-beam connection member 3 is installed so that the plugging steel pipe 31 of the column-beam connection member 3 is coaxial with the lower steel pipe 11a above the lower steel pipe 11a. The lower protruding rebar 32c is disposed inside the lower steel pipe 11a.

The upper steel pipe installation process is carried out.
As shown in Fig. 6, the upper steel pipe 11b is installed above the blocking steel pipe 31 so as to be coaxial with the blocking steel pipe 31. The upper protruding rebar 32a is disposed inside the upper steel pipe 11b. The upper steel pipe installation process may be performed in parallel with a part of the pouring pipe installation process, the working pipe installation process, the lower steel pipe concrete pouring process, the concrete compaction process, and the concrete inspection process, which will be described later.

The pouring pipe installation process is carried out.
As shown in Fig. 7, a casting hole 51 is formed in the upper part of the lower steel pipe 11a so as to penetrate the plate thickness of the lower steel pipe 11a. One end 52a of a casting pipe 52 formed in a cylindrical shape is connected to the casting hole 51, and the casting hole 51 and the casting pipe 52 are connected. The other end 52b of the casting pipe 52 is arranged so as to face upward. The casting hole 51 may be provided at the upper end of the lower steel pipe 11a, or may be provided at a position lower than the upper end of the lower steel pipe 11a.

The working pipe installation process is carried out.
A work hole 56 is formed in the upper part of the lower steel pipe 11a so as to penetrate the plate thickness of the lower steel pipe 11a. One end 57a of a cylindrically formed work pipe 57 is connected to the work hole 56 to communicate the work hole 56 and the work pipe 57. The other end 57b of the work pipe 57 is arranged to face upward. The work hole 56 may be provided at the upper end of the lower steel pipe 11a, or may be provided at a position lower than the upper end of the lower steel pipe 11a. The work hole 56 is preferably formed at a position higher than the casting hole 51.

The process of pouring concrete into the lower steel pipe is carried out.
The casting hose 53 is inserted from the other end 52b of the casting pipe 52 through the casting hole 51 and placed inside the lower steel pipe 11a. Concrete 54 is poured into the casting hose 53, and the concrete 54 is cast inside the lower steel pipe 11a. This concrete 54 becomes the column concrete portion 12 inside the lower steel pipe 11a.

The concrete compaction process is carried out.
The vibrator 58 is inserted from the other end 57b of the work pipe 57 through the work hole 56 and placed inside the lower steel pipe 11a. The concrete 54 (column concrete portion 12) poured in the lower steel pipe 11a is vibrated and compacted.

Carry out concrete inspection process.
As shown in Fig. 8, the condition, amount, etc. of the concrete 54 (column concrete portion 12) poured inside the lower steel pipe 11a is checked from the other end 57b of the work pipe 57. It is preferable that the concrete 54 (column concrete portion 12) is poured up to the upper end of the lower steel pipe 11a.

In the construction method for a column-beam joint structure configured in this manner, in the joint member installation process, the column-beam joint member 3, in which the joint concrete portion 33 is filled inside the plugging steel pipe 31, is installed above the lower steel pipe 11a. In the lower steel pipe concrete pouring process, concrete 54 (column concrete portion 12) is poured inside the lower steel pipe 11a, and there is no need to fill the plugging steel pipe 31 because it is already filled with concrete (joint concrete portion 33). This makes it easy to pour the concrete.

In addition, a casting pipe 52 is connected to a casting hole 51 formed in the upper part of the lower steel pipe 11a, and concrete 54 (column concrete part 12) is cast into the inside of the lower steel pipe 11a from the other end 52b facing upward of the casting pipe 52. Therefore, concrete can be cast from above the lower steel pipe 11a, making concrete casting easy to do.

In addition, a vibrator 58 that vibrates and compacts the concrete 54 (pillar concrete section 12) poured into the lower steel pipe 11a is inserted through a work hole 56 formed in the upper part of the lower steel pipe 11a. Therefore, since there is a work hole 56 for inserting the vibrator 58 in addition to the pouring hole 51 for pouring the concrete 54 (pillar concrete section 12), the workability of compacting the concrete is good.

In addition, a work pipe 57 can be connected to a work hole 56 formed in the upper part of the lower steel pipe 11a, and a vibrator 58 can be inserted from the other end 57b of the work pipe 57 facing upward, making the work of compacting the concrete even easier.

In addition, the working tube 57 used for compacting the concrete can be used to check the concrete 54 (pillar concrete section 12) poured into the lower steel pipe 11a, so there is no need to provide a separate inspection hole for checking the concrete 54 (pillar concrete section 12).

In addition, in the joint member assembly process, the upper end of the joint rebar 32 is supported by the upper rebar support base 44, and the lower end of the joint rebar 32 is supported by the lower rebar support base 43. This improves the accuracy of the positioning of the joint rebar 32. This reduces the amount of work required during the lower steel pipe concrete pouring process, as there is no need to return the joint rebar 32 to its designated position.

In addition, the upper steel pipe installation process can be carried out before the lower steel pipe concrete pouring process, allowing for greater freedom in process selection.

The assembly procedures and the shapes and combinations of the components shown in the above-mentioned embodiments are merely examples, and may be modified in various ways based on design requirements, etc., without departing from the spirit of the present invention.

For example, in the embodiment shown above, a pouring pipe 52 is connected to the pouring hole 51 of the lower steel pipe 11a, and concrete is poured from the pouring pipe 52, but the present invention is not limited to this. Concrete may be poured from the pouring hole 51 without the pouring pipe 52.

In the embodiment shown above, the work pipe 57 is connected to the work hole 56 of the lower steel pipe 11a, and the vibrator 58 is inserted from the work pipe 57, but the present invention is not limited to this. The vibrator 58 may be inserted from the work hole 56 without the work pipe 57, or the vibrator 58 may be inserted from the casting hole 51, casting pipe 52, etc.

DESCRIPTION OF SYMBOLS 1...Column 1A...Column member 2...Beam 2A...Beam member 11...Steel pipe 11a...Lower steel pipe 11b...Upper steel pipe 12...Column concrete section 31...Covering steel pipe 32...Connecting reinforcing bar 33...Connecting concrete section 34...Connecting beam 51...Pouring hole 52...Pouring pipe 52a...One end 52b...Other end 56...Work hole 57...Work pipe 57a...One end 57b...Other end 58...Vibrator 100...Column-beam joint structure

Claims (5)

A method for constructing a column-beam joint structure between a concrete-filled steel pipe column and a steel beam, comprising:
a lower steel pipe installation process for installing the lower steel pipe so as to extend in a vertical direction;
a connecting member installation process in which a connecting member having a plurality of connecting rebars extending in the vertical direction, a plugging steel pipe arranged to surround the outside of the vertical middle of the plurality of connecting rebars, a connecting concrete portion filled inside the plugging steel pipe, and a connecting beam connected to the plugging steel pipe is coaxially arranged above the lower steel pipe;
an upper steel pipe installation process in which an upper steel pipe is coaxially installed on the upper side of the plugging steel pipe;
A lower steel pipe concrete pouring process for pouring concrete through a pouring hole formed in the upper part of the lower steel pipe so as to penetrate the plate thickness of the lower steel pipe. The method for constructing a beam-column joint structure according to claim 1, further comprising a step of installing a casting pipe in which one end of a cylindrical casting pipe is connected to the casting hole and the other end of the casting pipe is installed so as to face upward. The method for constructing a beam-column joint structure according to claim 1 or 2 includes a concrete compaction process in which a vibrator is inserted into a working hole formed in the upper part of the lower steel pipe so as to penetrate the plate thickness of the lower steel pipe, and the concrete poured in the lower steel pipe is vibrated and compacted. The method for constructing a beam-column joint structure according to claim 3, further comprising a work tube installation step of connecting one end of a cylindrically formed work tube to the work hole and installing the other end of the work tube so that it faces upward. The method for constructing a beam-column joint structure according to claim 4, further comprising a concrete checking process for checking the concrete poured into the lower steel pipe from the other end of the work pipe.

Images