Construction method for column-beam joint structure

Abstract

To provide a construction method for a column-beam joint structure and a joint member capable of easily performing concrete installation work.SOLUTION: A construction method for a column-beam joint structure comprises: a lower side steel pipe installation of installing a lower side steel pipe 11a so as to extend in the vertical direction; a joint member installation of disposing a joint member 3 which has a plurality of joint reinforcements 32 extending in the vertical direction, a covering steel pipe 31 disposed so as to surround the outside of a vertically intermediate portion of the plurality of joint reinforcements 32, a joint concrete portion 33 charged into the covering steel pipe 31, and a joint beam 34 joined to the covering steel pipe 31, so that the covering steel pipe 31 becomes coaxial with the lower side steel pipe 11a at the upper side of the lower side steel pipe 11a; an upper side steel pipe installation of coaxially installing an upper side steel pipe 11b at the upper side of the covering steel pipe 31; and a lower side steel pipe concrete installation of installing concrete from an installation hole 51 which is formed to penetrate the plate thickness of the lower side steel pipe 11a at the upper part of the lower side steel pipe 11a.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to a method for constructing a column-beam joint structure. By law This is related to. [Background technology]

[0002] Conventionally, a connection structure between a concrete-filled steel pipe column, in which connecting rebars (main bars) and concrete are filled inside the steel pipe, and a steel-framed beam arranged above and below the concrete-filled steel pipe column has been known.

[0003] The following Patent Document 1 proposes a concrete-filled steel pipe column in which a reinforcing steel bar is arranged inside. The reinforcing steel bar has a plurality of vertical reinforcing bars extending vertically and arranged at intervals along the circumferential direction, and a plurality of shear reinforcing bars (circular reinforcing steel bars) that are circular in plan view and arranged at intervals in the vertical direction so as to bundle the plurality of 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 bar can ensure the shear transmission performance and axial force transmission performance of the column. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2018-131770 A Summary of the Invention [Problem to be solved by the invention]

[0005] 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 steel beams and connecting rebars at the joints significantly reduces the efficiency of the concrete pouring work and takes time. In addition, since 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 rebars are only simply fixed with binding wires, etc., so if the connecting rebars move out of place during pouring, post-work is required to return the connecting rebars to their original positions, which is time-consuming.

[0006] In addition, when the height of the pillar is large, it is necessary to use a concrete hose, but a normal size concrete pouring hose often cannot pass through the gap between the flanges of the beams that cross at right angles at the joint, and it becomes necessary to reduce the diameter of the concrete pouring hose. This causes problems such as a significant decrease in the efficiency of concrete pouring work or even making pouring concrete itself difficult.

[0007] In addition, when pouring concrete into the steel pipe of the lower column, the pouring work must be done from the top of the joint, so the construction work for the upper column steel pipe must be carried out after the pouring work for the lower concrete, which creates the problem of reduced freedom in process selection.

[0008] The present invention has been made in consideration of the above circumstances, and provides a method for constructing a column-beam joint structure that allows easy pouring of concrete. Law provide. [Means for solving the problem]

[0009] 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.

[0010] In the construction method for a beam-column joint structure configured in this way, in the joint member installation step, the joint member with the joint concrete portion filled inside the plugging steel pipe is installed above the lower steel pipe. In the lower steel pipe concrete pouring step, 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.

[0011] In addition, the construction method for a column-beam joint structure according to the present invention may include a casting pipe installation process in which one end of a cylindrically formed casting pipe is connected to the casting hole and the other end of the casting pipe is installed so as to face upward.

[0012] In the construction method for the 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. Therefore, concrete can be poured from above the lower steel pipe, which makes pouring work easier.

[0013] In addition, the construction method of the beam-column joint structure of 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 vibrations are applied to the concrete poured in the lower steel pipe to compact it.

[0014] In the construction method for a beam-column joint structure configured in this way, a vibrator that applies vibrations to the concrete poured in the lower steel pipe to compact it 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.

[0015] In addition, the construction method for a column-beam joint structure according to the present invention may 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.

[0016] In the construction method for a beam-column joint structure configured in this manner, a work pipe can be connected to the 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 the work of compacting the concrete even easier.

[0017] In addition, the construction method for a column-beam joint structure according to the present invention may include a concrete inspection process for inspecting the concrete poured into the lower steel pipe from the other end of the work pipe.

[0018] In the construction method for a beam-column joint structure configured in this manner, the concrete poured into the lower steel pipe can be inspected using the work pipe used for compacting the concrete, so there is no need to drill a separate inspection hole for inspecting the concrete. Effect of the Invention

[0021] Construction method of the column-beam joint structure according to the present invention By law This makes it possible to easily carry out the concrete pouring operation. [Brief description of the drawings]

[0022] [Figure 1] 1 is a vertical cross-sectional view showing a column-beam joint structure according to one embodiment of the present invention. [Diagram 2] 2 is a cross-sectional view taken along line AA in FIG. 1. [Diagram 3] 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. [Figure 4] 4 is a diagram showing a construction method for a beam-column joint structure according to one embodiment of the present invention, illustrating a joint member assembly process, which is a process subsequent to that shown in FIG. [Diagram 5] 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. [Figure 6] 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. [Figure 7] 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. [Figure 8] 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. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] 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 one 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 concrete-filled steel pipe construction (CFT construction) and a beam 2 of 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.

[0024] The column members 1A are arranged above and below the column beam connection member 3. The column member 1A has a steel pipe 11 and a column concrete portion 12. The steel pipe 11 is formed in a cylindrical shape. The axis of the steel pipe 11 faces the vertical direction. The column concrete portion 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.

[0025] 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 to each other. 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 portion 12. The column concrete portion 12 is filled to a position slightly lower than the other end 52b of the casting pipe 52.

[0026] 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 in communication. The work pipe 57 extends outside and upward of 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 part 12. The column concrete part 12 is filled to a position slightly lower than the other end 57b of the work pipe 57.

[0027] The beam member 2A is connected to a longitudinal end of a joint beam 34 (described later) of the beam-column joint member 3. The beam member 2A is arranged in a cross shape in a plan view. The beam member 2A is made of an 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.

[0028] The column-beam joint member 3 includes a plugging steel pipe 31, a joint reinforcing bar 32, a joint concrete portion 33, and a joint beam 34.

[0029] The filling 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 filling steel pipe 31 is formed into a substantially cylindrical shape by the four steel pipe plate materials 31a. The axis of the filling steel pipe 31 is oriented in the vertical direction. The filling steel pipe 31 is arranged between the steel pipes 11 of the upper and lower column members 1A. The diameter of the filling steel pipe 31 is substantially the same as the diameter of the steel pipe 11. The filling steel pipe 31 is arranged coaxially with the steel pipe 11.

[0030] The joint rebars 32 extend in the vertical direction. Fig. 2 is a cross-sectional view taken along line AA in Fig. 1. As shown in Fig. 2, a plurality of joint rebars 32 are arranged inside the closing steel pipe 31. The plurality of joint rebars 32 are arranged at intervals in the circumferential direction. The joint rebars 32 are arranged at positions that do not interfere with a joint beam 34, which will be described later.

[0031] As shown in Fig. 1, the portion of the joint reinforcing bar 32 that protrudes upward from the closing steel pipe 31 is referred to as the upper protruding reinforcing bar 32a. The upper protruding reinforcing bar 32a is disposed inside the upper steel pipe 11b. The upper protruding reinforcing bar 32a is fixed to the column concrete portion 12 filled inside the upper steel pipe 11b.

[0032] The portion of the joint reinforcing bar 32 that is disposed inside the closing steel pipe 31 is referred to as the intermediate reinforcing bar 32b. The closing steel pipe 31 is disposed so as to surround the outside of the intermediate reinforcing bar 32b, which is the vertical center of the joint reinforcing bars 32. The intermediate reinforcing bar 32b is fixed to the joint concrete portion 33 described later.

[0033] The portion of the joint reinforcing bar 32 that protrudes downward from the closing steel pipe 31 is referred to as the lower protruding reinforcing bar 32c. The lower protruding reinforcing bar 32c is disposed inside the lower steel pipe 11a. The lower protruding reinforcing bar 32c is fixed to the column concrete portion 12 filled inside the lower steel pipe 11a.

[0034] The connection concrete portion 33 is filled inside the closing steel pipe 31. Four connection beams 34 are arranged perpendicular to each other in a cross shape when viewed from above. The connection beams 34 are made of H-shaped steel. The connection beams 34 have a pair of connection flanges 34a and a connection web 34b. The pair of connection flanges 34a are arranged spaced apart in the vertical direction. The connection web 34b connects the pair of connection flanges 34a to each other. The connection web 34b is joined to the closing steel pipe 31.

[0035] The flange 21 of the beam 2 is joined to an end in the longitudinal direction of the joint flange 34a. The web 22 of the beam 2 is joined to an end in the longitudinal direction of the joint web 34b.

[0036] The upper column 1 includes an upper steel pipe 11b, an upper protruding rebar 32a, and a column concrete portion 12. The lower column 1 includes a lower steel pipe 11a, a lower protruding rebar 32c, and a column concrete portion 12. The beam 2 includes a beam member 2A and a joint beam 34. The upper and lower columns 1 and beams 2 are joined by a closing steel pipe 31, an intermediate rebar 32b, and a joint concrete portion 33.

[0037] 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 placed below four locations where the connection beams 34 of the column-beam connection members 3 to be placed in a later process will be placed. 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.

[0038] As shown in FIG. 4, a temporary upper steel frame 42 is placed 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 reinforcing bar support base 43 is placed on the work surface g inside the space surrounded by the multiple temporary lower steel frames 41. An upper reinforcing bar support base 44 is installed so as to be erected on the multiple temporary upper steel frames 42. A plurality of connecting reinforcing bars 32 are placed inside the closing steel pipe 31. For example, the upper and lower ends of the connecting reinforcing bars 32 are inserted into support holes formed in the upper reinforcing bar support base 44 and the lower reinforcing bar support base 43 so as to penetrate in the vertical direction, thereby positioning the connecting reinforcing bars 32. A formwork (not shown) is placed at the bottom of the closing steel pipe 31, and concrete is poured inside the closing steel pipe 31 to form the connecting concrete portion 33. This completes the column-beam connecting member 3. The column-beam connection member 3 may be manufactured by carrying out the joint member assembly process in advance at a manufacturing factory or the like and then transported to the construction site, or the column-beam connection member 3 may be manufactured by carrying out the joint member assembly process at the construction site.

[0039] 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.

[0040] 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 placed inside the lower steel pipe 11a.

[0041] 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, working pipe installation process, lower steel pipe concrete pouring process, concrete compaction process, and concrete inspection process, which will be described later.

[0042] 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 cylindrical casting pipe 52 is connected to the casting hole 51, so that the casting hole 51 and the casting pipe 52 are in communication. 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.

[0043] 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 with 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 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.

[0044] 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.

[0045] The concrete compaction process is carried out. A 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.

[0046] Carry out concrete inspection process. As shown in Fig. 8, the condition, amount, etc. of 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.

[0047] In the construction method for a column-beam joint structure configured in this manner, in the joint member installation step, the column-beam joint member 3, with the joint concrete portion 33 filled inside the filling steel pipe 31, is installed above the lower steel pipe 11a. In the lower steel pipe concrete pouring step, concrete 54 (column concrete portion 12) is poured inside the lower steel pipe 11a, and there is no need to fill the filling steel pipe 31 because it is already filled with concrete (joint concrete portion 33). This makes it easy to pour the concrete.

[0048] Furthermore, 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 portion 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, improving workability in casting the concrete.

[0049] Also, a vibrator 58 that vibrates and compacts the concrete 54 (pillar concrete portion 12) poured in 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 portion 12), the workability of compacting the concrete is good.

[0050] 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.

[0051] In addition, since the work pipe 57 used in compacting the concrete can be used to check the concrete 54 (pillar concrete portion 12) poured into the lower steel pipe 11a, there is no need to provide a separate inspection hole for checking the concrete 54 (pillar concrete portion 12).

[0052] 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.

[0053] In addition, since the upper steel pipe installation process can be carried out before the lower steel pipe concrete pouring process, the freedom of process selection can be increased.

[0054] The assembly procedures, shapes and combinations of the components, etc. shown in the above-described embodiment are merely examples, and various modifications can be made based on design requirements, etc., without departing from the spirit of the present invention.

[0055] For example, in the embodiment shown above, the pouring pipe 52 is connected to the pouring hole 51 of the lower steel pipe 11a, and concrete is filled from the pouring pipe 52, but the present invention is not limited to this. The pouring pipe 52 may not be provided, and concrete may be filled from the pouring hole 51.

[0056] 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, the casting pipe 52, etc. [Explanation of symbols]

[0057] 1. Pillar 1A…Column member 2…beam 2A…beam member 11...Steel pipe 11a…Lower steel pipe 11b…Upper steel pipe 12...Concrete column 31…Blocking steel pipe 32…Reinforcing bar joint 33…Concrete joint 34...Joining beam 51...Pouring hole 52...Pouring pipe 52a...One end 52b...Other end 56...Work hole 57...Work tube 57a...One end 57b...Other end 58...Vibrator 100…Column beam joint structure

Claims

1. 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.

2. A construction method for a column-beam joint structure as described in claim 1, further comprising a casting pipe installation process for connecting one end of a cylindrically formed casting pipe to the casting hole and installing the other end of the casting pipe so that it faces upward.

3. 3. A construction method for a beam-column joint structure as described in claim 1 or 2, further comprising a concrete compaction process in which a vibrator is inserted into a working hole formed at the upper part of the lower steel pipe so as to penetrate the plate thickness of the lower steel pipe, and vibrations are applied to the concrete poured into the lower steel pipe to compact it.

4. The construction method for a column-beam joint structure according to claim 3, further comprising a work pipe installation step of connecting one end of a cylindrically formed work pipe to the work hole and installing the other end of the work pipe so that it faces upward.

5. A construction method for a column-beam joint structure as described in claim 4, further comprising a concrete inspection process for inspecting the concrete poured into the lower steel pipe from the other end of the work pipe.

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