JPH0575867B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a filled frame concrete structure having a steel tape frame used for, for example, columns of architectural structures.

[Conventional technology]

Conventionally, a filled steel pipe concrete structure is known as a structure used for pillars of architectural structures, which is made by vertically installing steel pipes as a formwork and pouring concrete into them.

This filled steel pipe concrete structure is simply filled with concrete into a steel pipe, so the steel pipe and concrete are in a bonded state.
they are one with each other.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional filled steel pipe concrete structure, the steel pipe and the concrete are in an adhesive state and are integrated. Therefore, when an axial compressive force is applied to this filled steel pipe concrete structure, the steel pipe behaves as one with the concrete. Furthermore, when concrete exceeds a predetermined compressive strength, its distortion becomes extremely large. When concrete is severely distorted, the steel pipes that are integrated with it may exceed the Mises yield condition or cause local buckling.

Therefore, in a filled steel pipe concrete structure, it cannot be expected that the yield strength of the concrete will be sufficiently increased due to the confining effect brought about by the steel pipes, and the pillars have no choice but to have a larger cross-sectional area than necessary.

This invention was made in view of the above circumstances, and it fully guarantees the increase in axial compressive strength brought about by a filled concrete structure with a frame, and makes the cross-sectional area of the column smaller than that of the conventional one. The aim is to provide a filled concrete structure with a frame that can be used.

[Means for solving problems]

In this invention, a cylindrical frame is formed by spirally winding a steel tape, and the frame is filled with concrete, and the steel tape is overlapped in the axial direction of the frame. , and is capable of sliding in the axial direction.

In this invention, when reinforcing bars are arranged in the concrete filled in the frame or when prestress is introduced, the strength of the member can be increased.

[Effect]

According to this invention, with the above-described structure, the frames of the steel tapes are helically overlapped in the axial direction, and they can slide relative to each other in the axial direction. Therefore, if an axial compressive force acts on a filled concrete structure with a steel tape frame and the concrete is compressed, and if this exceeds the predetermined compressive strength and a large strain occurs in the concrete, the steel tape The frame bodies of the two slide in the axial direction and overlap each other.

That is, the concrete receives the compressive force in the axial direction, and the steel tape frame receives ring tension from the concrete as a reaction that gives a confining effect to the concrete.

〔Example〕

The present invention will be explained below with reference to FIGS. 1 to 6. FIGS. 1 and 2 are diagrams showing a first embodiment of the present invention, and show a filled frame concrete structure having a frame made of steel tape.
3 and 4 are diagrams showing a second embodiment of the invention, and FIGS. 5 and 6 are diagrams showing a third embodiment of the invention.

First, referring to FIGS. 1 and 2, reference numeral A indicates a column (hereinafter abbreviated as column) having a concrete structure with a filling frame. This column A is composed of a frame 1 made by winding steel tape into a cylindrical shape, concrete 3 filled into the frame, and a cylindrical space 4 formed at the end of the frame 1. .

Here, the frame 1 of the steel tape (hereinafter abbreviated as frame) is made by winding a tape made of, for example, amorphous metal in a spiral manner so that the tape wound earlier overlaps the tape wound later. It is made into a cylindrical shape.

The frame 1 is made by wrapping a tape made of amorphous metal or the like in a spiral shape along the inner surface of a cylindrical paper sheet (not shown). Another example is one in which a tape made of amorphous metal or the like is spirally wound in a film made of plastic or the like. A cylindrical space 4 formed at the end of the frame 1 is for grouting mortar into it when connecting the column A to another column (not shown).

To manufacture the column A, first, the cylindrical frame 1 is formed by winding steel tape in a spiral from the bottom to the top, so that the tape wound before overlaps the tape wound after. . Next, concrete 3 is filled into the frame 1. At this time, a space 4 for grouting when connecting another frame to the end of the frame 1
form.

The column A manufactured in this way has a frame 1 made of steel tape wrapped in layers in the axial direction.
An axial compressive force acts on column A, causing concrete 3
Even if a large strain occurs in the frame 1, the tapes of the frame 1 simply slide and overlap each other. Therefore, the axial force is received only by the concrete 3, and the frame 1 gives a confining effect to the concrete, and receives ring tension as a reaction.

That is, the column A receives axial force through the concrete 3, which is strong against compression, and receives ring tension through the frame body 1, which is strong against tension. As a result, the frame 1 gives a confining effect to the concrete 3, and the concrete 3 gives a ring tension to the frame.

Therefore, due to the synergistic effect of the frame 1 and the concrete 3, the column A is guaranteed to have a much higher axial compressive strength than conventional columns, and its cross-sectional area can be reduced. Become.

Next, FIGS. 3 and 4 will be explained. Third
4, the same elements as those shown in FIGS. 1 and 2 are designated by the same reference numerals. In FIGS. 3 and 4, reference numeral B indicates a column (hereinafter abbreviated as "column") of a filled frame concrete structure containing reinforced concrete, and reference numeral 5 indicates a reinforcing bar. The reinforcing bars 5, 5... are concrete 3 in the frame 1.
Reinforcement is arranged along the circumferential direction inside the frame 1 before filling. Reinforced concrete is made by filling concrete 3 into a frame 1 in which reinforcing bars 5, 5, . . . are arranged. Therefore, the column B can have higher member strength than the column A described above.

Furthermore, FIGS. 5 and 6 will be explained. In FIGS. 5 and 6, the same elements as those shown in FIGS. 3 and 4 are designated by the same reference numerals. In Figs. 5 and 6, reference numeral C indicates a column (hereinafter abbreviated as column) of a filled frame concrete structure containing prestressed concrete, and reference numeral 6
is a sheath tube.

To make column C, concrete 3 is replaced with steel pipe 1.
The sheath pipes 6, 6, . . . are installed in the steel pipe 1 at the same time as the reinforcing bars 5, 5, . Rebar 5,5
... and sheath pipes 6, 6... are installed in the frame 1, and concrete 3 is filled and hardened. Next, a PC steel material (not shown) is passed through the sheath pipes 6, 6, . . . embedded in the concrete. After the concrete hardens, an axial compressive force is introduced into column C by applying tension to the prestressed steel material passed through it. This column C to which axial compressive force was introduced has a filled frame concrete structure to which prestress force is applied.

Therefore, when a tensile force is applied to the column C, the actually generated tensile stress is a value obtained by subtracting the compressive stress of the prestress. In other words, this pillar C
can be made of a filled frame concrete structure with even greater bending strength than the columns A and B described above.

In the above three embodiments, the filled-frame concrete structure column can be used as a flexible structure column because its cross-sectional area can be reduced.

Possible applications include super high-rise buildings with flexible structures. This provides the same effect as conventional pillars against earthquakes.

〔Effect of the invention〕

As mentioned above, in this invention, a steel tape is wound spirally to form a cylindrical frame, and concrete is filled into the frame.
Since the frames are stacked in the axial direction and can be slid in the axial direction, even if the concrete is greatly distorted in the axial direction due to compressive force in the axial direction, the tapes forming the frame will slide and overlap each other. Therefore, the axial force is applied to the concrete, which is strong against compression, and only the ring tension is generated in the frame made of steel tape, which is strong against tension, as a reaction force that gives a confining effect to the concrete.

In other words, in conventional filled steel pipe concrete structures, it was not possible to fully utilize the large axial compressive strength generated by the confine effect due to the Mises yield condition, but this invention fully guarantees this. This makes it possible to reduce the cross-sectional area of the column.

[Brief explanation of drawings]

1 to 6 are diagrams showing embodiments of the present invention. Figures 1 and 2 are the first diagrams of this invention.
FIG. 1 is a front sectional view of the main part of the present invention, FIG. 2 is a sectional view taken along the line X-X of FIG. 1, and FIGS. FIG. 3 is a front cross-sectional view of essential parts of the invention, FIG. 4 is a Y-Y line cross-sectional view of FIG. 3, and FIGS. 5 and 6 are views showing a second embodiment of the invention. FIG. 5 is a front cross-sectional view of the main part of the present invention, and FIG. 6 is a cross-sectional view taken along the Z--Z line in FIG. 5. FIG. 1...Frame body, 3...Concrete, 5...Reinforcement bar, 6...Sheath pipe.

Claims (1)

[Claims] 1. A cylindrical frame is formed by spirally winding a steel tape, and the frame is filled with concrete, and the steel tape extends in the axial direction of the frame. A filling frame concrete structure characterized by being stackable and slidable in the axial direction. 2. A filled frame concrete structure according to claim 1, characterized in that reinforcing bars are arranged in the concrete filled in the frame. 3. The filling frame concrete structure according to claim 1, characterized in that prestress is introduced into the concrete.