JP2009121090A - Reinforced concrete column - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reinforced concrete column having sufficient high strength for applying it to a skyscraper while preventing reduction in ease of construction and increase of cost of construction. <P>SOLUTION: This reinforced concrete column 1 is provided with a column main body 2 formed by super high-strength concrete, a plurality of main reinforcements 3 arranged in the inside of the column 1 with a predetermined covering 3a from a surface 2a of the column main body 2, a first distributing bar 4 arranged to be wound around an outer side of at least a partially arranged main reinforcement out of the plurality of main reinforcements 3, and a second distributing bar 7 having a slight covering or exposed from the surface 2a of the column main body 2 and arranged on the outer side of at least a partially arranged main reinforcement out of a plurality of main reinforcements 3. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a reinforced concrete column applied to a concrete structure or the like, and more particularly to an ultra high strength reinforced concrete column applied to a column part of a high-rise building or the like.

Reinforced concrete columns applied to concrete structures are generally arranged inside a column body made of concrete with a plurality of main bars extending in the vertical direction with a predetermined cover and acting on compressive stress, A plurality of force distribution bars are arranged and wound around the outside of the main bar array.
By the way, in recent years, high-strength reinforced concrete columns have been adopted in high-rise buildings and the like because the compressive force acting on them is very large. More specifically, there has been proposed one in which hoops that serve as distribution bars are arranged in the vicinity of the surface of the column main body with little or no cover (for example, Patent Document 1). reference). In such a reinforced concrete column, the hoop is disposed with no cover or with a slight cover, so that the entire cross section of the column can be used for the expression of strength, and high strength is achieved. It has been realized.
In addition, a structure in which a steel pipe is wound around the outer peripheral surface of a column main body, a structure in which steel fibers or the like are mixed into the concrete forming the column main body, and the like have been proposed. In these, it is supposed that the strength of the entire reinforced concrete column can be increased by steel pipes, steel fibers, and the like, and the concrete forming the column main body can be prevented from brittle fracture.
Japanese Patent Laid-Open No. 10-266460

However, in the reinforced concrete column of Patent Document 1, by arranging the main bars with the necessary cover, a gap is formed between the main bars and the outer bars, and the main bars are moved by the bars. It was not possible to constrain effectively, and as a result the strength of the entire column could not be improved effectively.
Moreover, in the case where the steel pipe is wound, the number of steps for installing the steel pipe increases, and it becomes necessary to perform corrosion prevention of the steel pipe itself, which causes problems in terms of workability and cost. Furthermore, when concrete and steel fibers are mixed, special concrete is used, which causes technical problems in manufacturing and costs.

  The present invention has been made in view of the above-described circumstances, and provides a reinforced concrete column having high strength that can be applied to a high-rise building or the like while suppressing a decrease in workability and an increase in cost.

In order to solve the above problems, the present invention proposes the following means.
The reinforced concrete column of the present invention includes a column main body formed of ultra-high strength concrete, a plurality of main bars arranged inside with a predetermined cover from the surface of the column main body, and at least a part of the plurality of main bars. An array of at least a part of the plurality of main bars, with a first covering bar arranged so as to wrap around the outside of the plurality of main bars, and with a slight cover or exposed from the surface of the column main body And a second distribution bar arranged on the outer side.

  According to this configuration, since the first reinforcing bar is wound around the main bar, the main bar is constrained by the first distributing bar and effectively counters the compressive load. Moreover, the column main body is formed of ultra-high-strength concrete, and its own strength is improved. Further, the second reinforcing bar is disposed with a slight cover or exposed from the surface of the column main body, whereby the second force distribution bar is located in the portion corresponding to the cover outside the main bar of the column main body. It is possible to suppress the brittle fracture of concrete by using the reinforcing bars. For this reason, the column main body can effectively obtain strength not only inside the main bars but also outside the main bars that become the cover, and can exert the strength given by the ultra-high-strength concrete in the entire cross section, that is, The strength can be effectively improved by the main bar and the column main body. Here, when the second reinforcing bar has a slight cover from the surface of the column main body, the concrete will be covered with a slight cover on the outside of the second distributing bar. Becomes a dense structure by using high-strength concrete, and the covering portion is suitably filled. In addition, as a procedure for constructing such a reinforced concrete column, after placing the main reinforcement and the first reinforcement, the second arrangement is arranged on the outside, and high-strength concrete is placed. The workability is not lowered and the material cost can be minimized.

In addition, it is preferable that a plurality of the first distribution bars and the second distribution bars are alternately arranged in the extending direction of the main bars.
According to this configuration, the first reinforcing bar and the second distributing bar are alternately arranged, so that the main bar is evenly restrained in the extending direction and the main bar is covered with respect to the cover portion of the column main body. Thus, the strength can be improved evenly in the extending direction, and the strength as a whole can be improved more effectively. Moreover, the perforation of the reinforcing bar of a 1st distribution bar and a 2nd distribution bar can be ensured effectively, and workability | operativity can be improved.

Moreover, it is preferable that the surface of said 2nd power distribution reinforcement is given the rust prevention process.
According to this configuration, the corrosion resistance of the second reinforcing bar located closest to the surface of the column main body can be improved by applying the rust prevention treatment, and in particular, the second reinforcing bar is arranged in the column. It is effective when it is arranged so as to be exposed on the surface.

  According to the reinforced concrete column of the present invention, it is possible to suppress deterioration in workability and increase in cost by including a column main body formed of ultra-high-strength concrete, a first strength bar, and a second strength bar. High strength applicable to high-rise buildings can be ensured.

FIG. 1 to FIG. 3 show a first embodiment according to the present invention, and show a reinforced concrete column applied to a column part of a concrete structure requiring high strength such as a super high-rise building. 2 is a cross-sectional view taken along a cutting line AA in FIG. 1, and FIG. 3 is a cross-sectional view taken along a cutting line BB. As shown in FIG. 1 to FIG. 3, a reinforced concrete column 1 of the present embodiment has, for example, a rectangular cross section, a column main body 2 formed of ultra-high strength concrete, and a main reinforcement embedded in the column main body 2. 3. The inner hoop muscle 5 and the inner lateral restraint muscle 6 that are the first distribution muscles 4 and the outer hoop muscle 8 and the outer lateral restraint muscle 9 that are the second distribution muscles 7 are provided. Here, the ultra-high-strength concrete forming the column main body 2 refers to a design standard strength of 120 N / mm ² or more.

  The main bar 3 is made of a deformed steel bar, a PC steel bar, or the like, and extends in the vertical direction in which the column main body 2 extends, and has a predetermined cover 3a from the surface 2a of the column main body 2. A plurality are arranged at a predetermined pitch along 2a. Here, the thickness of the cover 3a is determined from the external environment to be used, the strength of the concrete forming the column body 2, and the like.

In addition, deformed bar steel or the like is used for the inner hoop muscle 5, the inner lateral restraint muscle 6, the outer hoop muscle 8, and the outer lateral restraint muscle 9.
The inner hoop bars 5 have a substantially rectangular shape corresponding to the cross-sectional shape of the column main body 2, and are arranged in the horizontal direction so as to wrap around the outside of the array of the main bars 3. Restrained inside. Further, the inner lateral restraint bars 6 have a substantially rectangular shape, are embedded inside the column main body 2, and are arranged so as to be wound around the outer side of each part of the array of opposing main bars 3. . The inner lateral restraint muscles 6 are arranged in pairs so as to restrain the opposing main muscles 3 inside.

  Further, the outer hoop line 8 has a substantially rectangular shape corresponding to the cross-sectional shape of the column main body 2, has a slight cover 8 a from the surface 2 a of the column main body 2, and surrounds the array of the main bars 3, so that the cover 3 a portion Are arranged in the horizontal direction. The lateral lateral restraint bars 9 have a substantially rectangular shape, are embedded in the column main body 2, and are arranged in the cover 3 a portion of the main bars 3 so as to surround the outside of each part of the opposing main bars 3. It is installed. The outer lateral restraint muscles 9 are arranged in pairs so as to restrain the opposing main muscles 3 to the inside. Further, in the outer lateral restraint muscle 9, the portion disposed in the cover 3 a portion has the cover 9 a slightly from the column main body surface 2 a like the outer hoop muscle 8.

  Here, the inner hoop muscle 5 and the inner lateral restraint muscle 6 which are the first distribution muscles 4 are arranged in substantially the same horizontal cross section, and a plurality of sets are arranged at a predetermined pitch in the vertical direction. Has been. Further, the outer hoop muscles 8 and the lateral lateral restraint muscles 9 which are the second distribution muscles 7 are also arranged in a substantially identical horizontal cross section and arranged in a plurality in the vertical direction. The set of the reinforcing bars 4 and the set of the second distributing bars 7 are alternately arranged in the vertical direction. In addition, the pitch between the first force distribution bars 4 and the second force distribution bars 7 is the minimum necessary in terms of design as a force distribution bar when the amount of each reinforcing bar does not dispose the second force distribution bar 7. The pitch is set to be smaller than the amount of the reinforcing bars to be applied, and the vertical interval between the first first reinforcing bar 4 and the second second reinforcing bar 7 is equal to that of the first reinforcing bar 4 and the second reinforcing bar 4. It is preferable that the total amount of reinforcing bars 7 is set at an interval that is equal to or greater than the required amount of reinforcing bars. More specifically, for example, if the deformed steel bar having the same diameter is used for the first distribution bar 4 and the second distribution bar 7, it is necessary for the design when the second distribution bar 7 is not provided. If the pitch to be taken is 100 mm, the pitches of the first force distribution bars 4 and the second force distribution bars 7 are set to 150 mm, respectively.

  The inner hoop muscle 5, the inner lateral restraint muscle 6, the outer hoop muscle 8, and the outer lateral restraint muscle 9 are substantially rectangular in the above. However, in terms of assembly, substantially cono-shaped reinforcing bars are combined by a lap joint or the like. It is a thing. In addition, a supplementary muscle 10 is disposed in the vertical direction inside the outer hoop muscle 8 and the outer lateral restraint muscle 9, and the supplementary muscle 10 vertically connects the plurality of outer hoop muscles 8 and the outer lateral restraint muscle 9 to each other. It is for assembling at a predetermined pitch in the direction, and is not considered in the structural calculation.

  According to the reinforced concrete column 1 as described above, the main hoop 3 has the first hoop bar 5 and the inner lateral restraint bar 6 wound around the main bar 3, so that the main bar 3 has the first reinforcing bar 4. It is constrained by the distribution bar 4 and effectively counters the compressive load. Moreover, the column main body 2 is formed of ultra high strength concrete, and the strength of the column main body 2 is improved. Further, an outer hoop muscle 8 and an outer lateral restraint muscle 9 which are the second distributing muscles 7 are arranged with a slight cover 8a, 9a from the surface 2a of the column body 2, and thereby the column body 2 The brittle fracture of the concrete can be suppressed by the outer hoop muscle 8 and the outer lateral restraint muscle 9 in the portion corresponding to the cover 3 a outside the main reinforcement 3. For this reason, the column main body 2 can effectively obtain strength not only inside the main bar 3 but also outside the main bar 3 serving as the cover 3a, and effectively exhibits the strength given by the ultrahigh strength concrete in the entire cross section. In other words, the strength can be effectively improved by the main reinforcement 3 and the column main body 2. In particular, a set of inner hoop muscles 5 and inner lateral restraint muscles 6 that are the first distribution muscles 4 and a group of outer hoop muscles 8 and outer lateral restriction muscles 9 that are the second distribution muscles 7 are alternately arranged. By being provided, the main reinforcing bar 3 can be restrained evenly in the extending direction, and the strength of the covering 3a portion of the column main body 2 can be improved uniformly in the extending direction of the main reinforcing bar 3, which is more effective as a whole column. In particular, the strength can be improved. Furthermore, the amount of reinforcing bars required for design as a strength bar when the pitch of the first strength bars 4 and the pitch of the second strength bars 7 are not provided. By setting as described above with reference to, the strength of the entire column can be effectively improved while minimizing the amount of reinforcing bars of the first distribution bar 4 and the second distribution bar 7.

  Here, concrete is covered with a little cover 8a, 9a on the outside of the outer hoop bar 8 and the outer lateral restraint bar 9, but the column main body 2 becomes a dense structure by using high-strength concrete. The portions of the covers 8a and 9a are preferably filled. As a procedure for constructing such a reinforced concrete column 1, the main reinforcement 3, the inner hoop reinforcement 5 and the inner lateral restraint reinforcement 6 are arranged, and then the outer hoop reinforcement 8 and the lateral lateral restraint are made using the additional reinforcement 10 on the outer side. Since the reinforcing bars 9 are arranged and high-strength concrete is simply placed, the workability is not lowered and the material cost can be minimized. Moreover, since the 1st distribution bar 4 and the 2nd distribution line 7 are alternately arrange | positioned as mentioned above, the 1st distribution line 4 and the 2nd distribution line 7 The space of the reinforcing bar can be effectively secured and the workability can be improved. In addition, by setting the pitch between the first reinforcing bars 4 and the pitch between the second distributing bars 7 as described above, the perforation of each reinforcing bar is more suitably secured and the workability is further improved. Can be

  4 and 5 show a second embodiment according to the present invention. In this embodiment, members that are the same as those used in the above-described embodiment are assigned the same reference numerals, and descriptions thereof are omitted.

  The reinforced concrete column 20 of this embodiment has an outer hoop bar 22 and an outer lateral restraint bar 23 as the second distribution bar 21. In the present embodiment, the outer hoop bars 22 are disposed in the horizontal direction in the portion of the cover 3a so as to be exposed from the surface 2a of the column main body 2 and surround the array of the main bars 3. The lateral lateral restraint bars 23 are embedded in the column main body 2 and are disposed in the cover 3a so as to surround each part of the array of the opposing main bars 3 and are arranged on the cover 3a. The portion to be provided is exposed from the surface 2a. Further, the outer hoop muscles 22 and the outer lateral restraint bars 23 are subjected to a rust prevention treatment on at least the surfaces exposed to the outside from the surface 2a.

  Thus, when it arrange | positions so that at least one part of the 2nd strength distribution bar | burr 21 may be exposed from the surface 2a, it does not have a slight fog like 1st Embodiment, and concrete paste is added to the said fog Therefore, the workability can be further improved. On the other hand, the exposed portion is subjected to a rust prevention treatment, so that necessary durability can be ensured. Note that the rust prevention treatment may be applied to a portion embedded in the column main body 2. By doing in this way, the corrosion resistance of the 2nd distribution muscle 31 can further be improved. Moreover, as a method of performing the rust prevention treatment on the exposed portion, it is possible to apply a waterproof coating or the like to the entire surface 2a after placing the concrete of the column main body 2.

  As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the concrete structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included.

  In each of the above embodiments, the reinforced concrete column has a substantially rectangular cross-sectional shape, but is not limited thereto, and can be applied to various cross-sectional shapes such as a circular shape and an oval shape. In addition, the first distribution muscle has an inner hoop muscle and an inner lateral restraint muscle, and the second distribution muscle has an outer hoop muscle and an outer lateral restraint muscle. It is good also as what has any one, respectively.

It is the bar arrangement of the reinforced concrete column according to the first embodiment of the present invention viewed from the side. It is sectional drawing in the cutting line AA of FIG. It is sectional drawing in the cutting line BB of FIG. It is the bar arrangement of the reinforced concrete pillar of 2nd Embodiment of this invention seen from the side. FIG. 5 is a cross-sectional view taken along a cutting line CC in FIG. 4.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,20 Reinforced concrete pillar 2 Column main body 2a Surface 3 Main reinforcement 3a Cover 4 First distribution reinforcement 7, 21 Second distribution reinforcement 8a, 9a Cover

Claims (3)

A pillar body made of ultra-high-strength concrete;
A plurality of main bars arranged inside with a predetermined fog from the surface of the pillar body;
A first distributing muscle arranged to wrap around the outside of an array of at least a part of the plurality of main muscles;
A second power distribution bar disposed on the outside of the array of at least a part of the plurality of main muscles, with a slight cover from or exposed to the surface of the column main body. Reinforced concrete pillar. In the reinforced concrete pillar according to claim 1,
A plurality of the first reinforcing bars and the second distributing bars are alternately arranged in the extending direction of the main reinforcing bars. In the reinforced concrete pillar according to claim 1 or 2,
A reinforced concrete column, wherein the surface of the second reinforcing bar is rust-proofed.

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