JP2804219B2 - Reinforced steel pipe unit and building construction method using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to iron used in buildings.
The present invention relates to a reinforced steel pipe unit and a method for constructing a building using the same .

[0002]

2. Description of the Related Art A high axial force is applied to columns of a high-rise building. Therefore, a column having a structure capable of withstanding this high axial force is required for a high-rise building.

Conventionally, a steel pipe column 100 as shown in FIG. 7 has been known as this type of column. This steel pipe column 100
It has a structure in which concrete 102 is cast in the steel pipe 101, whereby the axial force applied to the steel pipe pillar 100 is distributed and burdened between the steel pipe 101 and the concrete 102, and the axial strength of the steel pipe pillar 100 is increased. Things.

However, in a super-high-rise building, since a considerable high axial force is applied to the steel pipe column 100, the thickness of the steel pipe 101 needs to be considerably increased. For this reason, the cost of the steel pipe column 100 increases.

[0005] Therefore, a reinforcing bar is provided in the steel pipe 101 of the steel pipe column 100, and the reinforcing steel, the steel pipe 101 and the concrete 1
It is conceivable to adopt a structure that bears a high axial force with the 02.

[0006]

However, in the above-described steel pipe column with a reinforcing bar, a problem occurs in connection work of the steel pipe columns.

[0008] That is, in this steel pipe column, as shown in FIG. 8, the lower end of the reinforcing steel bar 103 is vertically erected while being connected to the main reinforcing bar 111 protruding from the floor 110 of each floor. Drop it into the reinforcing bar 103,
A method of placing concrete 102 in a steel pipe 101 and connecting the steel pipe columns to the main reinforcement 111 of the floor 110 is adopted.

[0008] Therefore, the steel pipe 1 is
01 needs to be lifted to just above the reinforcing bar 103 having a height corresponding to the height of each floor. That is, it is necessary to lift the steel pipe 101 to a height of twice the height of the reinforcing bar 103 while suspending the steel pipe 101, resulting in poor work efficiency. Moreover, the worker must climb the scaffold or the like assembled along the reinforcing bar 103 and work in an unstable posture, such as aligning the lower end of the steel pipe 101 with the upper end of the reinforcing bar 103. There is also a problem.

[0009] It is also conceivable to precast steel pipe columns with reinforced steel at the factory, but since steel pipes can also be used as formwork for casting, it takes more time to install the formwork than reinforced concrete columns are cast in place. To avoid this, it is more advantageous to cast on site than to increase the transportation cost by precasting.

[0010] In an ultra-high-rise building, a high axial force is applied to the pillars on the lower floor, but the axial force applied to the pillars becomes smaller as the floor becomes higher. Therefore, at all levels,
Building a building with steel pipe columns using expensive steel pipes 101 as shown in FIGS. 7 and 8 wastes construction costs.

The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a steel pipe unit with a reinforcing steel rod capable of improving the efficiency of connecting work of steel pipe columns and reducing construction costs.
An object of the present invention is to provide a knit and a construction method of a building using the knit .

[0012]

A reinforced steel pipe unit according to the first aspect of the present invention is a reinforced steel pipe unit used for constructing a steel pipe column of a building, wherein the reinforced steel pipe unit is one layer of a building. A steel pipe having a length corresponding to the height pitch of the steel pipe, a main reinforcing bar and a reinforcing bar, the reinforcing steel bar is inserted into the steel pipe, and the main reinforcing rod projects from a lower end of the steel pipe, and the steel pipe is A temporary fixing means for temporarily fixing the rebar to the steel pipe in a state in which the rebar can be moved downward relative to the rebar.

Construction of a building according to the invention of claim 2
The method uses the steel pipe unit with a reinforcing bar according to claim 1.
A method of building a building with floors protruding from the floor
Immediately above the main reinforcement, which is part of the lower steel column,
A step of lifting the pipe unit, the main of the downstairs steel column
A process for connecting a reinforcing bar and a main reinforcing bar of the steel pipe unit with a reinforcing bar.
The steel pipe of the steel pipe unit with the reinforcing steel
Moving the steel pipe down with respect to
Yes a step of pouring the concrete into the steel pipe of the knit, the
Characterized in that it.

Construction of a building according to the third aspect of the present invention
The method according to claim 2, wherein the lower part of the building is provided.
Use the building construction method to construct each floor in the lower part of the building.
Built in the city, for the high-rise portion of the buildings, reinforced concrete columns
Are erected on each floor.
Of the main reinforcement projecting and the main reinforcement in the upper reinforced concrete column
By connecting the lower end, each floor of the high-rise building is
At the boundary between the low and high sections of the structure, above the lower steel column
The main bar projecting from the end and the main reinforced concrete column
Connecting the lower end of the streak .

[0015]

According to the first aspect of the present invention, the steel pipe is inserted into the steel pipe.
Steel bar is temporarily fixed to steel pipe by temporary fixing means
Because it is a steel pipe unit,
Lift the steel pipe to above the rebar forming the steel pipe column on that floor
Need not be. Therefore, the lifting stroke of the steel pipe
Greatly reduced the need for scaffolding, etc.
Therefore, the working efficiency can be improved.

[0016] In addition, when the steel pipe is put on the reinforcing steel,
Workers are not close to the top of the rebar due to
There is no need to perform stable work, and construction work for steel pipe columns
It can be done safely.

Further, a steel pipe column reinforced by reinforcing steel is formed.
The same strength as before
In addition, the thickness of the steel pipe can be reduced and cost can be reduced.

According to the invention described in claim 2, the steel pipe column
When installing steel pipes in the connection work, the main reinforcement should be
The rebar inserted through the steel pipe in a protruding state is used as temporary fixing means.
Therefore, the steel pipe unit with rebar temporarily fixed to the steel pipe is
Since it can be done just by lifting it just above the main reinforcement of the steel pipe column below,
Steel pipe lifting stroke is short and high efficiency
It is a construction method. In addition, when the steel pipe is put on the rebar,
To align the steel pipes, the worker must be near the top of the rebar.
It is not necessary to carry out unstable work with
It can be done safely. Reinforced with reinforcing steel
Same as the conventional steel pipe column
While ensuring strength, the thickness of the steel pipe can be reduced and cost down
Can be planned.

According to the third aspect of the present invention, the lower layer portion
Use a steel pipe column with high axial strength,
Use reinforced concrete columns for high-rise
Construction cost-effective
Can be built. Moreover, the low and high sections
At the boundary, penetrate through the steel pipe columns located on each floor of the lower part
Located on the upper end of the main bar extending continuously and on each floor of the high-rise building
The lower end of the main bar extending continuously in the reinforced concrete column
The main bars are connected from the low-rise section to the high-rise section.
And the connection strength of the columns decreases at the boundary between the low-rise section and the high-rise section
Never do.

[0020]

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

First Embodiment FIG. 1 is a view showing one embodiment of a method of connecting steel pipe columns.

The present embodiment, as shown in FIG. 1, a steel pipe lifting process (of FIG. 1 (a)), the iron rod connecting step (in FIG. 1 (b)) and, included a steel drop process (of FIG. 1 (C)),
This is a method of forming the steel pipe column 1 and connecting it to the main reinforcement 41 of the steel pipe column 40 (dashed line) downstairs projecting from the floor 30 through the concrete casting step ((d) of FIG. 1).

In the steel pipe lifting step, as shown in FIG. 1A, the steel pipe 10 in which the reinforcing steel 20 is temporarily fixed is inserted into the main reinforcing steel 4.
This is the step of lifting up.

The steel pipe 10 is, as shown in FIGS.
It is a tubular body having a rectangular cross section, and H steels 11 for beam connection are protruded from both side surfaces thereof. A temporary fixing means, for example, a pair of angles 15 having an L-shaped cross section is attached to the lower end of the inner side surface 12 of the steel pipe 10.

On the other hand, the reinforcing bar 20 includes a plurality of main reinforcing bars 21 vertically assembled in a square shape corresponding to the steel pipe 10 and a plurality of reinforcing bars wound around the main reinforcing bars 21 and attached at predetermined intervals in the height direction. And the streaks 24. Spacers 25 are attached to the reinforcing bars 24 located above and below the main bars 21, respectively. This spacer 25
Are for vertically supporting the reinforcing bar 20 in the steel pipe 10, and project from the four sides of the reinforcing bar 24 as shown in FIG. 4.

Such a reinforcing bar 20 is used as a temporary fixing means.
Is temporarily fixed in the steel pipe 10 by the angle 15.

Specifically, as shown in FIG.
Is inserted through the upper opening of the steel pipe 10 and the lowermost reinforcement 2
4-1 is placed on the angle 15, whereby the reinforcing bar 20 is temporarily fixed in the steel pipe 10 with the lower end of the main reinforcing bar 21 protruding from the lower end of the steel pipe 10.

And, inside the steel pipe 10, the upper and lower spacers 25 are in contact with the inner side surface 12, and the rebar 20 is
It is supported vertically without tilting with respect to the steel pipe 10.

Since the steel pipe unit with the rebar is formed by temporarily fixing the rebar 20 to the steel pipe 10 in this manner, in this step, the lower end of the main rebar 21 is located just above the upper end of the main rebar 41 projecting to the floor 30. The steel pipe 10 may be lifted by a crane or the like to the height at which it is located. Therefore, the lifting amount of the steel pipe 10 is significantly reduced as compared with the case of FIG. 8, and the efficiency and speed of the lifting operation of the steel pipe 10 are improved.

Then, a reinforcing bar connecting step is performed. In this step, as shown in FIG. 1B, an operation of connecting the main reinforcement 41 projecting from the floor 30 and the main reinforcement 21 projecting from the lower end of the steel pipe 10 with, for example, a cap nut 31 is performed.
Since this connection work can be performed on the floor 30, the worker can work safely in a stable posture.

[0031] After the connecting work is completed, the process included a steel pipe drop is carried out. In this step, as shown by the arrow in FIG. 1C, only the steel pipe 10 is lowered on the floor 30 and is landed.

That is, the steel pipe 10 and the rebar 20 are
The angle 15 and the lowest reinforcement 24-
1 is in a temporarily fixed state in which the steel pipe 10 is simply in contact with the steel pipe 1, and only the steel pipe 10 is lowered by lowering the crane. In this state, the steel pipe 10 and the steel pipe of the steel pipe column 40 downstairs are connected by welding or the like.

As a result, as shown in the figure, since the reinforcing bar 20 is kept vertically supported in the steel pipe 10 by the spacer 25, the operation of supporting the reinforcing bar 20 vertically to the floor 30 is omitted. Further, the upper end of the main bar 21 protrudes from the upper end of the steel pipe 10, so that the steel pipe columns on the floor can be connected.

Finally, a concrete placing step is performed.

In this step, as shown in FIG.
An operation of injecting the concrete 32 from the upper opening of the steel pipe 10 is performed.

As a result, when the concrete 32 is solidified, the steel pipe columns 1 are erected on the floor 30 and are connected to the steel pipe columns 40 indicated by broken lines below the floor.

As described above, according to the present embodiment, the efficiency of the lifting operation of the steel pipe 10, the safety of the operation, and the rebar 2
It is possible to save labor for the vertical support work of zero.

In this embodiment, the reinforcing bar 20 is temporarily fixed by the angle 15, but the present invention is not limited to this, and the reinforcing bar 20 can be temporarily fixed by various methods.

For example, as shown in FIG. 5A, a plurality of rods 16 are hung on the lower end of the steel pipe 10, and the lowermost reinforcing bar 24-1 of the reinforcing bar 20 is placed on the rod 16. You may do it. Also, as shown in FIG.
A pin insertion hole 17 is drilled at the lower end of the steel pipe 10, and a pin 18 in the shape of a pin is passed through the pin insertion hole 17.
The lowermost reinforcing bar 24-1 of the reinforcing bar 20 may be placed on the top of the reinforcing bar 8. Accordingly, in the concrete placing step, the concrete 32 can be poured and placed from below the steel pipe 10 by using the pin insertion holes 17.

Further, in this embodiment, the method of connecting the steel pipe column 1 for welding and connecting the steel pipe 10 of the steel pipe column 1 on the upper floor and the steel pipe of the steel pipe column 40 on the lower floor has been described. It is needless to say that the present invention can be applied not only to a so-called unbonded steel pipe column.

Second Embodiment Next, another embodiment of the building construction method according to the present invention will be described.

FIG. 6 is a sectional view showing a building constructed in this embodiment. The same members as those in the embodiment of the first invention are denoted by the same reference numerals.

In FIG. 6, reference symbol A denotes a floor of a low-rise section where a high axial force is applied to a column, and reference sign B denotes a floor of a high-rise section where a high axial force is not applied.

The lower part A is constructed by using the steel pipe column 1 applied to the embodiment of the first invention.

That is, the steel pipe 10 of the steel pipe column 1 is erected while being connected to the steel pipe of the steel pipe column 40 indicated by the broken line below by welding or the like. The reinforcing bar 20 is supported vertically in the steel pipe 10, and the lower end of the main bar 21 is
It is arranged in the steel pipe 10 in a state where it is connected to the upper end of the main reinforcement 41 of the steel pipe column 40 via 1. Further, concrete 32 is cast into the steel pipe 10, and the reinforcing bar 20 having the main bar 21 protruding upward is fixed in the steel tube 10.

After the plurality of steel pipe columns 1 are erected in the low-rise section A in this manner, the beams 50 are bridged between the H steels 11 of the respective steel pipe columns 1.

Then, a deck plate (not shown) is laid on the beam 50, and concrete is poured from above the deck plate to form the floor portion 60 of the high-rise portion B.

The high-rise section B is constructed using reinforced concrete columns 70. Specifically, the lower end of the main bar 72 of the reinforcing bar 71 is connected to the upper end of the main bar 11 of the steel pipe column 1 via a cap nut 61, and the reinforcing bar 71 is supported vertically to the floor 60.

Then, after the H steel 74 is connected to the reinforcing bar 71, the reinforcing bar 71 is surrounded by a mold (not shown), and concrete 75 is poured into the mold to form a reinforced concrete column 70 upright. The reinforced concrete columns 70 are not necessarily limited to those cast in place, and those pre-cast at a factory can also be used. When this precast reinforced concrete column is used, a sleeve capable of disposing a main bar projecting from the floor is formed at the lower end of the precast reinforced concrete column, and mortar can be filled and integrated after the main bar is inserted. . In addition, the connection structure between the reinforced concrete column 70 and the steel beam 80 can adopt various other structures in addition to the above embodiment.

After the plurality of reinforced concrete columns 70 are erected in the high-rise section B in this way, the beams 80 are bridged between the H steels 74 of the reinforced concrete columns 70.

Then, a deck plate (not shown) is laid on the beam 80, concrete is poured from above the deck plate, and a floor on the floor is formed.

Various internal stresses are applied to the building constructed as described above.

In the lower layer portion A, a large bending stress or an axial stress is applied. However, since the steel tube column 1 is used for the column of the low-rise section A, the steel tube 10 improves the proof stress against bending stress applied to the column, and the steel tube 10 and the reinforcing bar 20 reduce the axial stress applied to the column. And share the axial stress to improve the axial proof stress. In particular, since the reinforcing bars 24 of the reinforcing bars 20 bear the stress applied to the steel pipe 10, the thickness of the steel pipe 10 can be reduced.

On the other hand, in the high-rise section B, no large bending stress or axial stress is applied. Therefore, the high-rise section B
Thus, even if the reinforced concrete columns 70 are used, these stresses can be sufficiently endured only by the reinforcing bars 71.

As described above, in the present embodiment, in the low-rise section A where a large bending stress or an axial stress is applied, a building is constructed using the steel pipe column 1 having a high yield strength, and no large bending stress or an axial stress is applied. In the high-rise section B, since the building is constructed using the inexpensive reinforced concrete columns 70 without using the expensive steel pipe columns 1, it is possible to greatly reduce the construction cost while sufficiently securing the strength of the building.

Incidentally, a method of constructing a high-rise building in which the low-rise portion has a steel tube concrete column structure and the high-rise portion has a half-precast reinforced concrete column structure is disclosed in Japanese Patent Laid-Open No. 5-1800.
No. 3 is publicly known. However, according to the construction method disclosed in this publication, no reinforcing steel is arranged in the steel pipe concrete column constituting the low-rise portion. At the boundary between the low-rise section and the high-rise section, the length required for anchoring is supported in the steel pipe column at the upper end in the steel pipe column arranged on the lower floor, and protrudes from the upper end of this steel pipe column. The connected reinforcing bar is connected to the main bar of the reinforced concrete column above it.

Also in this prior art, similarly to the above-described embodiment, a steel pipe column is used for a low-rise portion requiring a high axial strength, and a reinforced concrete column is used for a high-rise portion where a large bending stress or axial stress is not applied. Since the boundary between the low-rise portion and the high-rise portion is reinforced only by the connecting reinforcing bar having a predetermined length, the axial proof stress at this boundary portion may be extremely reduced. Then, stress concentration occurs at the boundary between the low-rise section and the high-rise section, and it becomes impossible to sufficiently secure the proof strength of the building as a whole.

On the other hand, according to the above embodiment, the main reinforcing bars are continuously arranged in the vertical direction in which the steel pipe columns used for the low-rise section and the reinforced concrete columns used for the high-rise section are erected. It is excellent in that the axial proof stress is not extremely reduced at the boundary between the low-rise portion and the high-rise portion. Further, the above embodiment is also excellent in that the thickness of the steel pipe can be reduced by arranging the reinforcing steel including the main reinforcement in the steel pipe column in the lower part.

[0059]

As described above, according to the first aspect,
According to the invention, the rebar inserted in the steel pipe is temporarily fixed by the means.
Becomes a steel pipe unit with rebar temporarily fixed to the steel pipe.
Hold the steel pipe up above the reinforcing steel
No need to raise. Therefore, lifting straws for steel pipes
Can greatly reduce the need for scaffolding, etc.
Therefore, the working efficiency can be improved.

Further, when the steel pipe is put on the reinforcing steel,
Workers are not close to the top of the rebar due to
There is no need to perform stable work, and construction work for steel pipe columns
It can be done safely.

Further, a steel pipe column reinforced by a reinforcing bar is formed.
The same strength as before
In addition, the thickness of the steel pipe can be reduced and cost can be reduced. Claim
According to the invention described in the item 2, in the connection work of the steel pipe columns.
Install the steel pipe with the main reinforcement projecting from the lower end of the steel pipe.
The rebar inserted into the pipe is temporarily fixed to the steel pipe by temporary fixing means
The steel tube unit with the reinforced steel pipe to the main reinforcement of the steel pipe column downstairs.
Can be lifted just above the steel pipe.
How to build a building with high work efficiency with significantly reduced damage
Be the law. In addition, when placing the steel pipe on the
Workers are worried about the top end of rebar due to alignment
It is not necessary to perform regular work, and the connection work of steel pipe columns is safe
It is possible to do. In addition, reinforced by rebar
Because it can form steel pipe columns, it has the same strength as before.
The thickness of the steel pipe can be reduced while guaranteeing cost reduction
It is. According to the invention described in claim 3, it is so large.
In high-rise sections where no axial force is applied, reinforced concrete columns
Can be used to build a building without waste
And construction costs can be reduced.
In addition, the axial strength at the boundary between the low-rise section and the high-rise section can be guaranteed.
Has the effect of

[Brief description of the drawings]

FIG. 1 is a process diagram showing a method of connecting steel pipe columns according to one embodiment of the present invention in cross section, wherein FIG. 1 (a) shows a steel pipe lifting process, and FIG. 1 (b) shows a reinforcing bar connecting process; FIG (c) shows a step included a steel drop, FIG. (d) of indicating the concreting step.

FIG. 2 is a sectional view showing a steel pipe column applied to the present embodiment.

FIG. 3 is a cross-sectional view showing a temporarily fixed state of a reinforcing bar.

FIG. 4 is a cross-sectional view showing a mounting state of a spacer.

FIG. 5 is a cross-sectional view showing a modified example of the temporary fixing. FIG. 5A shows a temporary fixing state using a rod, and FIG.
Indicates a temporary fixing state using a pin.

FIG. 6 is a cross-sectional view illustrating a method of building a building according to another embodiment of the present invention.

FIG. 7 is a sectional view showing a conventional steel pipe column.

FIG. 8 is a schematic view showing a method of mounting a steel pipe column with a reinforcing bar.

[Explanation of symbols]

 1,40 steel pipe column 10 steel pipe 20 steel bar 21,41 main bar 25 spacer 30 floor 32 concrete

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Shigeichi Yamauchi 1-7-1 Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. (72) Atsushi Ichimura 1-7-1 Kyobashi, Chuo-ku, Tokyo Toda Construction Corporation (56) References JP-A-5-18003 (JP, A) JP-A-1-76924 (JP, U) JP-A-4-13322 (JP, B2) JP-A-4-20457 (JP , B2) (58) Field surveyed (Int. Cl. ⁶ , DB name) E04B 1/30 E04B 1/16 E04G 21/12 105 E04G 21/14

Claims (3)

(57) [Claims] 1. A steel pipe unit with a reinforcing bar used for constructing a steel pipe column of a building, comprising: a steel pipe having a length corresponding to a height pitch of one layer of the building; And a reinforcing bar inserted into the steel pipe, and the main reinforcing bar projects from a lower end of the steel pipe, and the steel pipe can move relatively downward with respect to the reinforcing steel,
And a temporary fixing means for temporarily fixing the reinforcing steel to the steel pipe. 2. A method for constructing a building using the steel tube unit with a reinforcing bar according to claim 1, wherein the reinforcing bar is provided immediately above a main reinforcing bar which is a part of a steel pipe column located downstairs projecting from a floor. Lifting the encased steel pipe unit; connecting the main reinforcement of the steel pipe column downstairs to the main reinforcement of the steel pipe unit with rebar; and moving the steel pipe of the steel pipe unit with rebar downward with respect to the rebar. And a step of placing concrete in a steel pipe of the steel pipe unit with a reinforcing bar. 3. A low-rise part of a building is constructed by using the building construction method according to claim 2, wherein each floor of the low-rise part of the building is constructed, and a reinforced concrete column is constructed on a high-rise part of the building. It is erected on each floor and connects the main reinforcement projecting from the upper end of the lower reinforced concrete column with the lower end of the main reinforcement in the upper reinforced concrete column to construct each floor of the high-rise building. A method for building a building, comprising connecting a main bar projecting from an upper end of a lower steel pipe column to a lower end of a main bar of an upper reinforced concrete column at a boundary of a high-rise portion.