JPH0536587B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a structural member for columns used in buildings where the columns are made of reinforced concrete and the beams are made of steel.

"Conventional Technology" Conventionally, as a frame for a building, a reinforced steel composite structure in which columns are made of reinforced concrete and beams are made of steel is known. According to this, construction costs are lower than when building the entire building with steel frames, and the construction period can be shortened compared with building the entire building with reinforced concrete, making use of the advantages of both. Can be built.

For columns in buildings with such structures, pre-assembled column reinforcing bars (pre-assembled reinforcing bars) are used to further shorten the construction period by eliminating the need to assemble reinforcing bars on site. There are many things.

To explain the work procedure when constructing a building with a reinforced steel composite structure using the reinforcing bar cage for columns, first, the reinforcing bar for columns is placed on the lowest floor with a length (height) corresponding to the floor height of that floor. The cages are built, steel beams are placed between the reinforcing cages, and then a formwork is assembled on the outside of the reinforcing cages and concrete is poured inside. Then, once the concrete has hardened, reinforcing bars for the floors above are added to the top of the reinforcing bars, and the above steps are repeated for each floor to construct the building.

``Problems to be solved by the invention'' However, with the above-mentioned methods, the column formwork is constructed on-site as in the past.
The effort involved in assembling and dismantling the formwork is not reduced in any way. Therefore, even if reinforcing cages were used for the columns, there was a problem in that it was difficult to significantly shorten the construction period.

In addition, since the columns constructed as described above have exactly the same structure as conventional reinforced concrete columns, their axial strength and shear strength are also comparable to those of conventional reinforced concrete columns, and the higher strength is It was something I couldn't hope for.

This invention was made in view of the above circumstances, and can be used to sufficiently shorten the construction period when constructing buildings with reinforced and steel composite structures, and can also be used to increase the structural strength of columns. The purpose is to provide a structural member for pillars that can be used.

``Means for Solving the Problems'' This invention relates to a column reinforcing bar cage assembled with a plurality of main column reinforcements and hoop reinforcements, and a steel beam connection device attached to a predetermined position of this reinforcing bar cage. The reinforcing bar cage is arranged in a state that encloses the reinforcing bar cage except for the lower end thereof, and concrete is poured inside the cage, and the poured concrete is prevented from being deformed in the radial direction. and a reinforcing member that also serves as a formwork, and the lower end of each column main bar of the reinforcing bar cage that protrudes from the lower end of the reinforcing member that also serves as a formwork is connected to each other reinforcing bar to be erected. At the lower end of the reinforcing member that also serves as a formwork, there is a reinforcing member that also serves as a formwork and is movable in the axial direction to cover the joint between the column main reinforcement and other reinforcing bars. It is characterized by being attached.

As the above-mentioned reinforcing member that also serves as a formwork, it is conceivable to use a material formed into a cylinder by hardening high-strength reinforcing fibers with a solidifying agent, or to use a steel pipe. In addition, when using a steel pipe, a deformation absorbing portion that absorbs deformation in the axial direction of the steel pipe is formed, and an unbonding treatment layer is formed on the inner surface of the steel pipe to unbond the concrete poured inside and the steel pipe. This is desirable.

"Function" The structural member for columns of the present invention is erected at a predetermined position by joining the lower ends of each column main reinforcement of the reinforcing bar cage that protrudes from the lower end of the reinforcing member that also serves as a formwork to other reinforcing bars. The connecting portions are covered by a formwork reinforcing member for the connecting portions, which is attached to the lower end of the formwork reinforcing member so as to be movable in the axial direction. Then, the frame of the building is constructed by joining the steel beams to the joint structure attached to the reinforcing bar cage and pouring concrete inside the column structural members. In addition, the reinforcing member that also serves as formwork acts as a waste formwork for columns, and after construction, prevents the concrete poured inside from deforming so as to bulge outward, increasing its compressive strength and shear strength. It works like this.

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

First, with reference to FIGS. 1 to 8, a column structural member A according to a first embodiment will be described. This column structural member A is applied to the column of a three-story (three-story) building with a reinforced steel frame composite structure, and includes a reinforcing bar cage 1, a shingle structure 2, and a reinforcement that also serves as a formwork. The main component is member 3. In addition, FIG. 1 is an elevational view showing the overall schematic configuration of this structural member A for columns,
The figure shows reinforcing member 3 that also serves as a formwork from structural member A for columns.
FIG. 3 is an elevational view showing the removed state, and FIG. 3 is a perspective view thereof.

As shown in these figures, the reinforcing bar cage 1 consists of a plurality of (12 in this example) column main reinforcements 4 and a large number of hoop reinforcements 5 surrounding them, and is designed to cover three layers of a building. Pre-assembled reinforcing bars with a circular cross section assembled to a length corresponding to the height. This rebar basket 1
Frames 6 that prevent buckling of the column main reinforcements 4 by supporting the column main reinforcements 4 from the inside are installed at predetermined intervals, and
A sleeve joint 7 is attached to the lower end of the sleeve.

This reinforcing bar basket 1 includes three shikiguchi structures 2.
is installed. These Shiguchi Structures 2
As will be described later, the steel beams of the building are connected to each other, and the floor beams of the roof floor are connected to the joint structure 2 attached to the top of the reinforcing bar basket 1 in Fig. 1. ,, The floor beams of the third and second floors are connected to the joint structures 2, 2 attached to the intermediate part, respectively.

As shown in FIGS. 3 to 5, these joint structures 2 include four H-beams 9 on the outside of a steel pipe 8.
The structure is joined by welding. The diameter of this steel pipe 8 is slightly larger than the diameter of the reinforcing bar cage 1, and is approximately equal to the external dimension of the column formed by this column structural member A. This steel pipe 8 constitutes the joint between the column and the beam, and also functions as a column formwork at the joint. Further, the H-beams 9 have the same cross section as the steel beams of the building, and serve as the ends of the beams after they are joined.

Further, diaphragms 10, 10 are attached to the upper and lower ends of the steel pipe 8, respectively. The diaphragms 10, 10 have openings 11, 1 in the center.
1 is formed, and there are air holes 12 around the...
is formed. Furthermore, this diaphragm 1
0 and 10 are formed with insertion holes 13 through which the column main reinforcements 4 of the reinforcing bar cage 1 are inserted, and through holes 15 through which the shear reinforcing bars 14 are inserted. The above-mentioned diaphragms 10, 10 are for reinforcing the joint portion and for attaching the joint structure 2 to the reinforcing bar cage 1. Further, the opening 11 is for passing a tremie pipe during concrete pouring, the air hole 12 is for discharging air during concrete pouring, and the shear reinforcing bars 15 are for pouring into the joint structure 2 and its inside. This is to ensure a sufficiently strong integration with the concrete being installed.

The shiiguchi structure 2 configured as described above is arranged such that the reinforcing bar cage 1 passes inside the steel pipe 8. Then, the main column reinforcement 4... is the diaphragm 1
By passing through the insertion holes 13 of No. 0 and 10 and connecting them there with means such as bolts (not shown) or welding, the shikiguchi structure 2 is connected to the reinforcing bar cage 1 at a predetermined interval, that is, the floor of each floor. The interval corresponding to the height is fixed.

In the reinforcing bar cage 1, the reinforcing members 3 which also serve as formworks are attached between the joint structures 2 and at the bottom of the reinforcing bar cage 1, respectively. This reinforcing member 3, which also serves as a formwork, is formed by solidifying high-strength reinforcing fibers 16 with extremely high tensile strength into a cylindrical shape using a solidifying material in advance, as shown in FIG.
The fibers 16 are arranged along the circumferential direction of the reinforcing member 3 which also serves as a formwork. High strength reinforcing fiber 16
For example, it is preferable to use carbon fiber, glass fiber, aramid fiber, etc., and as the solidifying material, a material that can solidify the fibers 16 into one body and has an appropriate degree of brittleness, such as PEEK resin, is preferable. It is preferable to use plastic materials such as vinyl chloride.

Since the fibers 16 of this formwork reinforcing member 3 are extremely strong against tensile force, it resists extremely strongly and almost deforms against the force (ring tension) that tries to push the fibers outward. When there is no compression force and a compressive force is applied in the axial direction (vertical direction in FIG. 6), the fibers 16 are deformed by being slightly shifted from each other because the solidifying material has a moderate brittleness. Therefore, this formwork reinforcing member 3
is capable of axial deformation and does not bear any axial compressive force. Further, since the reinforcing member 3 which also serves as a formwork is formed by simply solidifying the fibers 16, it is extremely lightweight and easy to handle during transportation.

The diameter of this reinforcing member 3 that also serves as a formwork is approximately the same as the diameter of the steel pipe 8 of the joint structure 2 (i.e., the external dimension of the column formed by this column structural member A).
In addition, the length is the distance between the two shikiguchi structures, 1 for those for the second floor and the third floor.
For floors, the length is from the lower end of the joint structure 2 to the upper part of the sleeve joint 7. As shown in FIG. 1, a formwork reinforcing member 17 for the reinforcing bar cage connection section is attached to the lower end of this reinforcing member 3 that serves as a formwork for the first floor in a vertically movable manner. There is. This reinforcing member 17 which also serves as a formwork for the connecting portion is also formed of high-strength reinforcing fibers 16 similarly to the above-mentioned reinforcing member 3 which also serves as a formwork.

These formwork reinforcing members 3 are connected to the steel pipes 8 of each joint structure 2, with a predetermined distance maintained between their inner surfaces and the reinforcing bar baskets 1.
It is disposed to enclose the reinforcing bar cage 1 except for its lower end. Note that in order to maintain this distance, an appropriate jig (spacer) may be used.

The structure of this structural member A for columns has been explained above, and next, the procedure for constructing a building using this structural member A for columns will be explained with reference to FIG.

First, the structural member A for the column is moved using a crane (not shown).
etc., and connected to the cage-shaped foundation reinforcing bars 18 previously constructed by sleeve joints 7, and erected at respective predetermined positions. Then, the reinforcing member 17 which also serves as a formwork for the connecting portion is pushed down to cover this connecting portion (see the connecting portion of the column structural member A on the right side in FIG. 7). Then, the steel beams 19 of each floor are bridged between the respective joint structures 2, 2 of the pillar structural members A and A built adjacent to each other, and the ends of those steel beams 19 and the joint structure are The ends of the H-section steel 9 of the body 2 are joined by welding or bolts (FIG. 7 shows the second floor beam 19 being attached).

Then, from the top of the column structural member A, a tremie tube (not shown) is inserted into the column structural member A by passing it through the opening 11 formed in the diaphragm 10 of the joint structure 2. Then, concrete is poured while gradually pulling up the tremie pipe, and the entire inside of the reinforcing member 3 serving as a formwork and the inside of the steel pipe 8 of the joint structure 2 is filled with concrete 20. FIG. 8 shows a cross section of a column formed by hardening the concrete 20.

In addition, in the above-mentioned procedure, the floor slab and the wall may be constructed in parallel with or before or after the above-mentioned procedure by an appropriate means commonly used in the past.

According to the above procedure, three layers of column reinforcing cages 1 can be erected at once, similar to when building a steel frame column, and the construction period can be shortened. Further, the steel beam 19 can be easily and reliably joined to the joint structure 2, and the steel beam 19 and the column main reinforcements 4 are sufficiently firmly connected via the joint structure 2. In addition, by using this column structural member A, the reinforcing member 3 that also serves as the formwork is attached to the reinforcing bar cage 1 in advance, so on-site construction (assembly and dismantling work) of the formwork can be omitted. Got tired,
In this respect, it can also contribute to shortening the construction period. Also,
Since concrete is poured using a tremie pipe and air holes 12 are provided in the diaphragm 10 of the joint structure 2, it is possible to sufficiently fill every corner of the column structural member A with concrete. . .

By using this pillar structural member A, the formwork reinforcing member 3 can reinforce the concrete 20 cast inside and increase its strength. That is, when compressive force and shearing force in the axial direction are applied to the concrete 20, the concrete 20 tries to deform so as to bulge outward, but at this time, the reinforcing member 3 that also serves as a formwork tightens the concrete 20 from the outside, causing a so-called confinement. exerts its effect and prevents its deformation. As a result, the compressive strength and shear strength of the concrete 20 can be significantly increased compared to conventional reinforced concrete columns with the same cross section, or the cross section of the concrete 20 can be made smaller to obtain the same strength. .

In addition, since the reinforcing member 3 that also serves as a formwork is made of hardened high-strength reinforcing fibers 16 and can be deformed in the axial direction, this reinforcing member 3 that also serves as a formwork may itself buckle or descend. It is possible to always and reliably exhibit the confine effect. In addition, since the lower end of the reinforcing bar cage 1 is made to protrude from the lower end of the reinforcing member 3 that also serves as a formwork, it is possible to easily connect the column main reinforcement 4 and the foundation reinforcing bars 19, and the lower end of the reinforcing member 3 that also serves as a formwork Since the reinforcing member 17, which also serves as a formwork for the joints and covers the joints between the reinforcing bars, is attached in advance so as to be movable in the axial direction, it is only necessary to push down the reinforcing member 17, which eliminates the need for formwork work at the joints. Moreover, it is possible to obtain exactly the same strength at the connection part as at other parts.

The structural member A for pillars according to the first embodiment has been described above. Next, the structural member B for pillars according to the second embodiment will be described with reference to FIGS. 9 to 11. This pillar structural member B is the above-mentioned pillar structural member A.
The only difference from this is the reinforcing member that also serves as the formwork.
Since the other components are the same, their explanation will be omitted.

In this column structural member B, a steel pipe 21 having the same shape and same dimensions as the formwork reinforcing member 3 in the above-mentioned column structural member A is used as a reinforcing member that also serves as a formwork. As shown in FIG. 10, this steel pipe 21 has a deformation absorbing portion 22 formed approximately at its longitudinal center. This deformation absorbing section 22 is
When an axial force is applied to the steel pipe 21, it easily expands and contracts to absorb the deformation of the steel pipe 21, and allows the steel pipe 21 to freely deform in the axial direction without resisting the axial force. be. This deformation absorbing part 2
2, for example, the steel pipe 21
A ring-shaped gap is formed by cutting the upper and lower edges of the steel pipe 21, and the gap is filled with a flexible material such as rubber, and a ring-shaped groove is formed on the inner or outer surface of the steel pipe 21 and the part is actively used as a weak part for seating. Various forms are conceivable, such as one in which the steel pipe 21 is made easy to bend, and one in which a plurality of long holes extending in the circumferential direction are formed in the steel pipe 21 to give elasticity in the axial direction.

Further, an unbonding treatment layer 23 is formed on the inner surface of the steel pipe 21. This unbonding treatment layer 23 is for maintaining an unbonded state by eliminating adhesion between the building 21 and the concrete 20 placed inside the building 21. This unbonding layer 23 can be formed by, for example, applying paraffin, grease, vaseline, asphalt, etc. to the inner surface of the steel pipe 21 in advance.

As shown in FIG. 9, the steel pipe 21 configured as described above is used by being attached to a reinforcing bar cage 1 similar to the above-mentioned column structural member A, together with a shikiguchi structure 2. Member B is formed. Note that a steel pipe 24 for a reinforcing bar cage connection portion is attached to the lower end of the steel pipe 21 for the first floor so as to be movable up and down.

According to this pillar structural member B, the steel pipe 2
Similar to the formwork reinforcing member 3 in the above-mentioned column structural member A, 1 acts as a column formwork and concrete 20 is cast inside, and the concrete 20 is reinforced to exert a confining effect. do. FIG. 11 is a sectional view showing a column formed by pouring concrete 20.

In this column structural member B, the steel pipe 21 maintains a non-adhesion state with the concrete 20 due to the unbonding treatment layer 23, and structurally behaves as a separate body. Therefore, even when an axial force is applied to the concrete 20, the steel pipe 21 is not affected by it. Furthermore, when an axial force is applied directly to the steel pipe 21, the deformation absorbing portion 22 deforms, causing the steel pipe 21 to
1, no axial stress occurs. Therefore, the steel pipe 21 does not buckle or descend, can always and reliably exhibit the confining effect, and can sufficiently increase the compressive strength and shear strength of the concrete 20.

The embodiments of this invention have been described above, but
This invention is not limited to the above. For example, in addition to those shown in the above-mentioned embodiments, any reinforcing member that also serves as a formwork can be used as long as it has strength equivalent to or higher than those shown in the above embodiments. Further, in the above embodiments, the cross-sectional shape of the pillar structural member is circular, but the cross-sectional shape is not limited to this, and may be, for example, quadrilateral, octagonal, or other polygonal shape.

Moreover, although the pillar structural member of the above embodiment was applied to a three-story building, it can of course be applied to even higher-rise buildings. In this case, it is sufficient to sequentially add about three layers of pillar structural members as in the above embodiment.

Furthermore, the shape of the shingle structure may be changed as appropriate depending on the form of the building and the shape and number of beams to be joined to the shingle structure. For example, when it is not necessary to use a tremie pipe for concrete pouring, as is the case in particular when applying to a one-story building, a joint structure 30 as shown in FIGS. 12 and 13 may be used. I can do it. This joint structure 30 consists of H-beams 3 that intersect in a cross shape.
A bent iron plate 32 is attached to surround the center of the iron plate 3.
2 acts as a stiffener and is also used as a formwork for the joint part. This joint structure 30 may also be provided with air holes 33 and shear reinforcing bars 34.

In addition, in the above example, a reinforcing member that also serves as a formwork for the connection part is attached to the previously constructed foundation, and after connecting the foundation reinforcing bars and the reinforcing bar cage, it is pulled upward to cover the connection part. It may be possible to do this, but in that case,
The handling of the reinforcing member that also serves as a formwork for the connecting portion, that is, its transportation work and installation work, must be performed separately from the structural member for the column, which complicates the work process. On the other hand, as mentioned above, by using a column structural member to which a reinforcing member that also serves as a formwork for the connection part is attached in advance to the lower end, the reinforcing member that also serves as a formwork for the connection part can be used together with the structural member for the column. It is possible to avoid complicating the work process.

"Effects of the Invention" As explained in detail above, according to the present invention, the reinforcing bar cage for columns has a structure in which a joint structure for joining steel beams and a reinforcing member that also serves as a formwork is attached to the reinforcing bar cage for columns. In addition to being able to easily and firmly join steel beams to the steel beams, the on-site construction of formwork can be omitted, and the construction period can be significantly shortened.

Furthermore, according to the present invention, the reinforcing member that also serves as the formwork exerts a confining effect, thereby increasing the compressive strength and shear strength of the concrete, and forming columns that are extremely strong compared to conventional reinforced concrete columns. or the cross section of the column can be made smaller to obtain the same strength.

Moreover, since the lower end of the reinforcing bar cage is made to protrude from the lower end of the reinforcing member that also serves as a formwork, it is possible to easily connect the column main reinforcement to other reinforcing bars, and the lower end of the reinforcing member that also serves as a formwork A reinforcing member that also serves as a formwork for the joints to cover the joints between the reinforcing bars is installed in the axial direction so that it can be moved freely in the axial direction, eliminating the need for any formwork work at the joints by simply pushing it down. , it is possible to ensure the same strength at the connection part as in other parts.

[Brief explanation of the drawing]

1 to 13 are diagrams showing embodiments of the present invention. 1 to 8 show the first embodiment, FIG. 1 is an elevational view showing the overall schematic configuration of the pillar structural member of the first embodiment, and FIG. 2 is a molded version of the pillar structural member. FIG. 3 is a perspective view of the reinforcing member that also serves as a frame; FIG. 4 is a plan view of the shingle structure; FIG. 7 is a perspective view of a reinforcing member that also serves as a formwork, FIG. 7 is an elevational view for explaining the construction procedure of a building using this structural member for columns, and FIG. 8 is a sectional view of a formed column. Figures 9 to 11 show the second embodiment, Figure 9 is an elevational view showing the overall schematic configuration of the structural member for columns of the second embodiment, and Figure 10 is used as a reinforcing member that also serves as a formwork. Perspective view of steel pipe, No. 11
The figure is a cross-sectional view of the formed column. FIGS. 12 and 13 show other examples of the structure of the joint structure, with FIG. 12 being a perspective view and FIG. 13 being a plan view. A, B... Structural member for columns, 1... Reinforcement cage for columns, 2... Connection structure, 3... Reinforcement member that also serves as formwork, 4... Column main reinforcement, 5... Hoop reinforcement, 16... High-strength reinforcing fibers, 17... Reinforcement member that doubles as formwork for connection parts, 18... Foundation reinforcing bars (other reinforcing bars), 19...
Steel beam, 20... Concrete, 21... Steel pipe (reinforcing member that also serves as formwork), 22... Deformation absorption part, 23
. . . Unbond treatment layer, 24 . . . Reinforcing member that also serves as a formwork for the connection portion, 30 . . . Connection structure.

Claims (1)

[Scope of Claims] 1. A structural member for columns used in buildings in which the columns are made of reinforced concrete and the beams are made of steel frame,
A column reinforcing bar cage assembled by a plurality of main column bars and hoop bars, a joint structure for connecting steel beams attached to a predetermined position of this reinforcing bar cage, and the reinforcing bar cage except for its lower end. and a reinforcing member that also serves as a formwork and prevents radial deformation of the poured concrete. The lower end of each column main bar of the reinforcing bar cage protruding from the lower end is connected to each other reinforcing bar to be used in an upright manner, and the lower end of the formwork reinforcing member is provided with: A structural member for a column, characterized in that a reinforcing member that also serves as a formwork for the connection portion is attached, which is movable in the axial direction so as to cover the connection portion between the column main reinforcement and other reinforcing bars. 2 The reinforcing member that also serves as a formwork includes carbon fibers, glass fibers,
The structural member for a column according to claim 1, characterized in that it is formed by solidifying high-strength reinforcing fibers such as aramid fibers into a cylindrical shape with a solidifying material. 3. The structural member for a column according to claim 1, wherein the reinforcing member that also serves as a formwork is a steel pipe. 4. The structural member for a column according to claim 3, wherein the steel pipe has a deformation absorbing portion formed at a predetermined position in the axial direction to absorb deformation in the axial direction occurring in the steel pipe. . 5. The method according to claim 3 or 4, wherein an unbonding layer is formed on the inner surface of the steel pipe to prevent adhesion between the steel pipe and concrete placed inside the steel pipe. Structural members for columns.