WO2008133460A1

WO2008133460A1 - Composite concrete column and construction method using the same

Info

Publication number: WO2008133460A1
Application number: PCT/KR2008/002381
Authority: WO
Inventors: Won-Kee Hong; Ho-Chan Lee; Jum-Han Kim
Original assignee: M.C.S.Tech; Cross Structural Consultant Co., Ltd.
Priority date: 2007-04-26
Filing date: 2008-04-25
Publication date: 2008-11-06
Also published as: US20100031605A1; KR100797194B1

Abstract

A composite concrete column comprising: upper and lower concrete column portions extending in the lengthwise direction and having an exposed portion between the upper and lower concrete column portions; an H-beam connected between the upper and lower concrete column portions to be exposed at the exposed portion; and a plurality of reinforcement bars embedded in the upper and lower concrete column portions around the H-beam to extend in the lengthwise direction.

Description

COMPOSITE CONCRETE COLUMN AND CONSTRUCTION

METHOD USING THE SAME

Technical Field

[1] The present invention relates to a composite concrete column and a construction method using the same, more particularly to a composite concrete column and a construction method using the same by which installation and construction is convenient and stability and reliability is improved while shortening the period of construction.

[2]

Background Art

[3] A building structure so called 'a Rahmen structure' consists of a crossbeam, a column and a slab. In constructing such a building structure, a slab is formed on the column and crossbeam, and cast in concrete. Since the procedure of installing the columns and the beams and concreting is conducted in place, it takes time and labor.

[4] A PC (pre-cast concrete) is widely used to decrease the period of construction and labor, in which a structure of reinforcing bars and concrete is constructed in the factory and transferred to be installed in the construction place. Accordingly the PC structure has an advantage of shortening the period of construction. However, the PC structure is so heavy and bulky to handle in the construction place.

[5]

Disclosure of Invention Technical Problem

[6] The present invention is designed to solve the above problems of the prior art. It is an object of the invention to provide a composite concrete column having advantages of shortening the period of construction and reducing the size and weight of a structure while providing enhanced resistance to earthquake in the case of tall buildings compared to the conventional PC structure.

[7] A composite concrete column of the present invention may be installed conveniently and quickly, and it is preferable to be used together with a composite concrete crossbeam invented by the inventor.

[8] Another object of the present invention is to provide a construction method using the composite concrete column.

[9]

Technical Solution

[10] In order to accomplish the above object, the present invention provides a composite concrete column comprising: upper and lower concrete column portions extending in the lengthwise direction and having an exposed portion between the upper and lower concrete column portions; an H-beam connected between the upper and lower concrete column portions to be exposed at the exposed portion; and a plurality of reinforcement bars embedded in the upper and lower concrete column portions around the H-beam to extend in the lengthwise direction.

[11] According to another aspect of the present invention, there is provided a composite concrete column comprising: an H-beam having a pair of flanges in parallel and a web connecting the pair of flanges each other; a pair of upper and lower concrete column portions formed on the side surfaces of the H-beam having an exposed portion between the upper and lower concrete column portions to face each other; and a plurality of reinforcement bars embedded in the upper and lower concrete column portions around the H-beam to extend in the lengthwise direction.

[12] Preferably, a plurality of brackets is formed on the side surface of the H-beam at the exposed portion.

[13] More preferably, a support portion is laterally extended from the upper surface of the concrete column portion.

[14] Preferably, both ends of the H-beam are embedded in the concrete column portions.

[15] More preferably, a plurality of studs is provided on the side surface of the H-beam at the portion embedded in the concrete column portions.

[16] According to another embodiment, the present invention further comprises embedded plates embedded in the lower end of the upper concrete column portion and the upper end of the lower concrete column portion with its one sides exposed, and wherein both ends of the H-beam are connected to the one sides of the embedded plates.

[17] According to another still embodiment, the H-beam is embedded in the concrete column portions through the whole length of the concrete column portions.

[18] Preferably, a cavity is formed in the concrete column portions.

[19] According to another aspect of the present invention, there is provided a construction method comprising the following steps of: installing composite concrete columns including upper and lower concrete column portions extending in the lengthwise direction with having an exposed portion between the upper and lower concrete column portions, an H-beam connected between the upper and lower concrete column portions to be exposed at the exposed portion, and a plurality of reinforcement bars embedded in the upper and lower concrete column portions around the H-beam to extend in the lengthwise direction; connecting ends of crossbeams to the H-beam at the exposed portion of the composite concrete columns; installing molds on the composite concrete columns and the crossbeams; and putting concrete on the molds and curing the same.

[20] According to another aspect of the present invention, there is provided a construction method comprising the following steps of: installing composite concrete columns including an H-beam having a pair of flanges in parallel and a web connecting the pair of flanges each other, a pair of upper and lower concrete column portions formed on the side surfaces of the H-beam having an exposed portion between the upper and lower concrete column portions to face each other, and a plurality of reinforcement bars embedded in the upper and lower concrete column portions around the H-beam to extend in the lengthwise direction; connecting ends of crossbeams to the H-beam at the exposed portion of the composite concrete columns; installing molds on the composite concrete columns and the crossbeams; and putting concrete on the molds and curing the same.

[21] Preferably, the crossbeam is a composite concrete crossbeam comprising: an H- beam; stirrup bars installed at a predetermined interval along the H-beam; and concrete member embedding at least a portion of the H-beam, and wherein a front end of the concrete member of the composite concrete crossbeam rest on the support portion.

[22] Preferably, a crossbeam installed on the outer portion of a wall comprises a support provided on the edge of the upper surface of the concrete member,

[23] and wherein an outer slab mold having a section of L- shape is installed on the support.

[24] More preferably, a crossbeam installed on the outer portion of a wall comprises a support provided on the edge of the upper surface of the concrete member, and a reinforcement angle bar connected between the upper surface and the side surface of the support, and wherein an outer slab mold having a section of L-shape is installed on the support.

Advantageous Effects

[25] According to the present invention, since buildings are constructed by installing precast composite concrete columns and connecting crossbeams to the composite concrete columns, the construction procedure is simplified and the period of construction is reduced.

[26] Particularly, the composite concrete column would be advantageous if it is used together with the composite concrete crossbeams suggested by the inventor.

[27]

Brief Description of the Drawings

[28] These and/or other aspects and advantages of the invention will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which.

[29] FIG. 1 is an exploded perspective view schematically showing a composite concrete column according to a first preferred embodiment of the present invention; [30] FIG. 2 is a front sectional view schematically showing a composite concrete column according to the first preferred embodiment of the present invention; [31] FIG. 3 is a side sectional view schematically showing a composite concrete column according to the first preferred embodiment of the present invention; [32] FIG. 4 is a side sectional view schematically showing a composite concrete column according to a second preferred embodiment of the present invention; [33] FIG. 5 is a side sectional view schematically showing a composite concrete column according to a third preferred embodiment of the present invention; [34] FIG. 6 is an exploded perspective view schematically showing a composite concrete column in FIG. 5; [35] FIG. 7 is an exploded perspective view schematically showing a composite concrete column according to a fourth preferred embodiment of the present invention; [36] FIG. 8 is a side sectional view schematically showing a composite concrete column according to a fourth preferred embodiment of the present invention; [37] FIG. 9 is a planar sectional view schematically showing a composite concrete column in FIG. 8. [38] FIG. 10 is an exploded perspective view schematically showing a composite concrete column according to a fifth preferred embodiment of the present invention; [39] FIG. 11 is a planar sectional view schematically showing a composite concrete column in FIG. 10. [40] FIG. 12 is a side sectional view schematically showing a construction state using the composite concrete column according to the preferred embodiment of the present invention; [41] FIG. 13 is a planar sectional view schematically showing a construction state using the composite concrete column according to the preferred embodiment of the present invention; [42] FIG. 14 is a perspective view schematically showing a composite concrete crossbeam connected to the composite concrete column according to the preferred embodiment of the present invention; [43] FIG. 15 is a plan view schematically showing a composite concrete crossbeam connected to the composite concrete column according to the preferred embodiment of the present invention; [44] FIG. 16 is a planar sectional view schematically showing a construction state in which the composite concrete crossbeams are connected to the composite concrete column according to the preferred embodiment of the present invention; [45] FIG. 17 is a perspective view schematically showing a composite concrete crossbeam for connecting another composite concrete crossbeam according to the preferred embodiment of the present invention; [46] FIG. 18 is a sectional view schematically showing a construction state in which the composite concrete crossbeams are connected with a traverse reinforcement member according to the preferred embodiment of the present invention;

[47] FIG. 19 is a sectional view schematically showing a construction state of outer area according to the preferred embodiment of the present invention;

[48] FIG. 20 is a sectional view schematically showing a construction state of outer area according to anther preferred embodiment of the present invention;

[49]

Best Mode for Carrying Out the Invention

[50] FIG.1 through FIG. 3 show a composite concrete column according to a preferred embodiment of the present invention. Here, FIG. 1 is a perspective view of a composite concrete column, FIG. 2 is a front sectional view of a composite concrete column, and FIG. 3 is a side sectional view of a composite concrete column.

[51] Referring to the drawings, a composite concrete column of the present invention comprises concrete column portions 10 and 20 extending lengthwise, an H-beam 30 connected between ends of the concrete column portions 10 and 20 to be exposed, and a plurality of reinforcement bars 40 embedded in the concrete column portions 10 and 20 around the H-beam 30 to extend lengthwise.

[52] The concrete column portions comprise an upper concrete column portion 10 and a lower concrete column portion 20 so that an exposed portion 15 where the H-beam 30 and the reinforcement bars 40 are exposed is formed between the lower end of the upper concrete column portion 10 and the upper end of the lower concrete column portion 20. As described later, ends of crossbeams are connected to the exposed portion 15 so that the exposed portion 15 is located as high as a slab is formed.

[53] The exposed portion 15 has a plurality of brackets 51, 52, 53 and 54 to connect the crossbeam. For example, the brackets 51, 52, 53 and 54 may be T-shaped steel member having fastening holes 55 that is welded to the side surface of the H-beam 30. The H- beam 30 includes a pair of flanges 31 and 32 in parallel, and a web 33 connecting the pair of flanges 31 and 32 so that the brackets 51 and 53 are welded to the outer surfaces of the flanges 31 and 32, and the brackets 52 and 54 are welded to both sides of the web 33 of the H-beam 30. However, the brackets are not limited to the present embodiment, and may be modified so as to connect ends of crossbeam by means of fasteners.

[54] The concrete column portions 10 and 20 are body of the column, and preferably have a section of square or circle, etc. More preferably, upper ends of the concrete column portion 10 and 20 have a support portion 22 laterally extending to stably support the end of the crossbeam. Accordingly, the end of the crossbeam is rest on the support portion 22 to be stably supported. However, the present embodiment does not restrict the configuration of the concrete column portion. In an alternative embodiment, the concrete column portion (see 20' of FIG. 4) may not have the support portion.

[55] According to the present embodiment, the H-beam 30 is connected with the concrete column portions 10 and 20 so that the ends of the H-beam 30 are embedded in the concrete column portions 10 and 20. That is, an upper end 30a of the H-beam is embedded in the lower end of the upper concrete column portion 10, and lower end 30b of the H-beam is embedded in the upper end of the lower concrete column portion 20. More preferably, a plurality of studs 34 are formed on the side surface of the H- beam 30 that is embedded in the concrete column portion, which results in firm connection with the concrete column portion.

[56] The reinforcement bars 40 are installed around the H-beam 30 to extend along the length of the concrete column portions 10 and 20 so that most of the length of the reinforcement bars 40 is embedded in the concrete column portions 10 and 20 while only a part of them is exposed at the exposed portion 15. The reinforcement bars may include modifications as long as it is able to reinforce the composite concrete column of the present invention.

[57] Although the present embodiment illustrates the composite concrete column having two concrete column portions, the number of the concrete column portion is not limited to this, and the composite concrete column of the present invention may comprise three concrete column portions.

[58] FIGs. 5 and 6 show a composite concrete column according to a third embodiment of the present invention. Here, the same numeral references as the previous embodiment denote the same members.

[59] Referring to the drawings, a composite concrete column of the present embodiment comprises concrete column portions 10 and 20 extending lengthwise, embedded plates 60 which are embedded in the ends of the concrete column portions 10 and 20 so that one sides of the embedded plates 60 are exposed, an H-beam 301 connected to the embedded plates 60, and a plurality of reinforcement bars 40 embedded in the concrete column portions 10 and 20 around the H-beam 30a to extend lengthwise.

[60] In the present embodiment, embedded plates 60 made of steel are installed at the lower end of the upper concrete column portion 10 and the upper end of the lower concrete column portion 20, respectively. The embedded plates 60 are embedded in the concrete column portions 10 and 20 of which one sides are exposed. Also, the embedded plates 60 have a plurality of studs 62 at the other ends to be fixed in the concrete column portions 10 and 20.

[61] The end of H-beam 301 is welded to the exposed surface of the embedded plate 60 as shown in FIG. 6. According to the present embodiment, the H-beam 301 has the same height as the exposed portion 15. Also, like the previous embodiment, a plurality of brackets 51, 52, 53 and 54 is connected to the side surface of the H-beam 301.

[62] In the composite concrete column of the present embodiment, the concrete column portions 10 and 20 and the H-beam 301 may be welded in the factory in advance, and alternatively, they may be assembled by welding in place. In the latter case, the composite concrete column can be downsized to facilitate transportation.

[63] FIGs. 7 to 9 show a composite concrete column according to a fourth embodiment of the present invention. FIG. 7 is a perspective view of a composite concrete column, FIG. 8 is a side sectional view of a composite concrete column, and FIG. 9 is a planar sectional view of a composite concrete column. Here, the same numeral references as the previous embodiment denote the same members.

[64] Referring to the drawings, a composite concrete column of the present embodiment comprises concrete column portions 10 and 20 extending lengthwise, an H-beam 302 embedded in the concrete column portions 10 and 20 in the whole length of the concrete column portions 10 and 20 while exposed between the concrete column portions 10 and 20, and a plurality of reinforcement bars 40 embedded in the concrete column portions 10 and 20 around the H-beam 302 to extend lengthwise.

[65] In the present embodiment, most of the length of the H-beam 302 is embedded in the concrete column portions 10 and 20, while only a part of the H-beam 302 is exposed at an exposed portion 15 between the concrete column portions 10 and 20.

[66] Preferably, the concrete column portions 10 and 20 have a cavity 70 as shown in

FIG. 9. More preferably, the cavity 70 is formed between flanges 302a and 302b of the H-beam along the length of the H-beam. However, the cavity may be formed at any place in the concrete column portions 10 and 20 to have various shapes.

[67] The cavity 70 makes the composite concrete column light so as to ease dealing and transferring them. Also, with the cavity 70, the concrete column portions 10 and 20 functions as a mold when concreting.

[68] FIGs. 10 and 11 show a composite concrete column according to a fifth embodiment of the present invention. FIG. 10 is a perspective view of a composite concrete column, and FIG. 11 is a planar sectional view of a composite concrete column.

[69] As shown in the drawings, a composite concrete column of the present embodiment comprises an H-beam 303, concrete column portions 100 and 200 attached to both side surfaces of the H-beam 303 extending lengthwise, and a plurality of reinforcement bars 40 embedded in the concrete column portions 100 and 200 around the H-beam 303 to extend lengthwise.

[70] The concrete column portions comprise a pair of upper concrete column portions 101 and 102 formed on the side surfaces of the flanges 303a and 303b of the H-beam 303 to face each other, and a pair of lower concrete column portions 201 and 202. A plurality of studs 305 are formed on the side surfaces of the flanges 303a and 303b of the H-beam 303 that is embedded in the concrete column portion, which results in firm connection with the concrete column portion.

[71] The present embodiment makes the composite concrete column light so as to ease dealing and transferring them like the previous embodiment. Also, molds 310 and 311 should be installed to cover the cavity between the concrete column portions 100 and 200 as shown in FIG. 11.

[72] Now the construction method using the above composite concrete column will be described. FIGs. 12 and 13 illustrate the construction of building structure using the composite concrete column. For convenience of explanation, the present embodiment is directed to the composite concrete column of FIGs 1 to 3, but other composite concrete columns may be adopted in the same way.

[73] FIG. 12 shows a composite concrete column of the present invention installed on the ground G in the construction place. The composite concrete column is manufactured in the factory in advance, and then fixed to the ground at the lower end of the concrete column portion 20.

[74] Subsequently, crossbeams 400 are connected to the exposed portion 15 of the composite concrete column at the end thereof. In the present invention, the crossbeam denotes an H-beam or a structure having an H-beam. More preferably, the crossbeam comprises the composite concrete crossbeam of FIGs. 14 and 15.

[75] Referring to FIGs. 14 and 15, the composite concrete crossbeam comprises an H- beam 410, stirrup bars 420 installed at a predetermined interval along the H-beam 410, and concrete member 430 embedding at least a portion of the H-beam 410.

[76] The H-beam 410 includes an upper flange 411 and a lower flange 412 in parallel each other, and a web 413 connecting the upper and lower flanges 411 and 412.

[77] Preferably, the lower flange 412 of the H-beam 410 has studs embedded in the concrete member 430 so that the H-beam 410 is able to firmly connect with the concrete member 430.

[78] The stirrup bars 420 are arranged at a predetermined interval along the length of the

H-beam 410, preferably, the stirrup bar 420 comprises a horizontal bar portion 421 embedded in the concrete member 430 to traverse the lower surface of the lower flange 412 of the H-beam 410, a intermediate bar portion 422 extending upward from the both ends of the horizontal bar portion 421 with an upper end of the intermediate bar portion 422 exposed out of the concrete member, and a extended bar portion 423 laterally extending outward from the upper end of the intermediate bar portion 422.

[79] The stirrup bars 420 make a compression force along the H-beam 410 to apply evenly through the section of the H-beam, and resist to a shear force applied in the direction rectangular to the H-beam. It should be understood that various kinds of stirrup bars may be adopted, not limited to the embodiment.

[80] The concrete member 430 is formed integrally on the H-beam 410 lengthwise to embed at least a portion of the length of the H-beam. Preferably, the concrete member 430 embeds at least a part of the lower flange 412.

[81] The concrete member 430 effectively resists to a bending force and a compression force together with the H-beam 410. Also, the concrete member 430 increases in the sectional area of the composite concrete column to thereby strengthen the resistance to external forces.

[82] As shown in the drawing, both ends of the H-beam 410 are exposed out of the concrete member 430 so that the composite concrete crossbeam can be connected to the composite concrete column of the present invention. To do so, fastening holes 410a may be formed at the ends of the H-beam 410.

[83] Preferably, the composite concrete crossbeam 400 comprises extension/compression bars which resist to an extension force and a compression force applied to the composite concrete crossbeam. Preferably, the extension/compression bars comprise a plurality of embedded bars 440 embedded between the lower flange 412 of the H-beam

410 and the horizontal bar portions 421 of the stirrup bars 420 in the concrete member in the lengthwise direction, and exposed bars 450 which are not embedded in the concrete member 430. Additionally, another typed bar other than the embedded bars 440 and the exposed bars 450 may be adopted.

[84] More preferably, reinforcement members 460 are further provided to support the stirrup bars 420 and the concrete member 430. The reinforcement member 460 is a reinforcement bar or a bar-typed member of which one end is welded to the upper flange

411 of the H-beam 410 and the other end is connected to the exposed portion of the stirrup bars 420.

[85] FIGs. 12 and 13 illustrate the state in which composite concrete crossbeams 400 having the above mentioned configuration are connected to the composite concrete columns of the present invention. Specifically, the end of the H-beam 410 of the composite concrete crossbeam 400 is connected to the H-beam 30 at the exposed portion of the composite concrete column. Preferably, the brackets 51 and 53 provided on the H-beam 30 of the composite concrete column are connected with the end of the H-beam 410 of the composite concrete crossbeam 400 by means of a connection plate 56 while fasteners such as bolts are inserted into the fastening holes 55 and 410a and fixed. FIG. 13 shows the H-beams 410 that are connected with the brackets 51, 52, 53 and 54 of the composite concrete column by bolts.

[86] More preferably, a front end 430a of the concrete member 430 of the composite concrete crossbeam 400 rests on the upper surface, i.e., on the support portion 22 of the lower concrete column portion 20 of the composite concrete column. With such a structure, it is very easy to connect the composite concrete crossbeam to the composite concrete column, and stability of structure may be assured.

[87] FIG. 16 shows four composite concrete columns 10a, 10b, 10c and 1Od on which composite concrete crossbeams 400a, 400b, 400c and 40Od are connected. Another composite concrete crossbeam 40Oe is further connected between the two composite concrete crossbeams 400a and 400c. Here, the composite concrete crossbeams 400a and 400c have connection brackets 470 formed with fastening holes 470a at the connection point as shown in FIG. 17. Accordingly, the end of the H-beam of the composite concrete crossbeam 40Oe can be connected to the connection bracket 470 in the same manner as the above.

[88] Referring again to FIG. 16, the composite concrete crossbeams 400b, 40Od and 40Oe may be fastened each other by a traverse reinforcement member 500 to prevent deformation or distortion of the composite concrete crossbeams when concreting. The traverse reinforcement member 500 is like an H-beam, preferably, which is welded to the upper flange 411 of the H-beam 410 of the composite concrete crossbeam 40Oe as shown in FIG. 18.

[89] As mentioned above, when the composite concrete columns and the composite concrete crossbeams are installed, molds are installed. A mold such as a deck plate may be installed between the composite concrete crossbeams 400a through 40Oe for a slab. Installation and construction of the deck plate mat be conducted according to Korean patent application No. 10-2005-0104999.

[90] A mold 520 may be installed at the connection point of the composite concrete column and the composite concrete crossbeam. At the same time, reinforcement bars are additionally arranged for the slab.

[91] FIG. 19 illustrates a composite concrete crossbeam 400' at the outer portion of a wall. The composite concrete crossbeam 400' of the present embodiment may comprises the same elements as the previous embodiment, and a support 481 having a section of L-shape is provided on the edge of the upper surface of the concrete member 430. Preferably, the support 481 is fixed by an embedded bolt 482 in the concrete member 430. Also, an outer slab mold 483 having a section of L-shape is installed on the upper surface of the support 481. The outer slab mold 483 may be engaged with the support 481 by welding or bolts.

[92] FIG. 20 illustrates another embodiment of the present invention showing an outer portion of a wall. The composite concrete crossbeam 400" has a support 491 of L- shape at one side. The support 491 has a length of the upper surface and the side surface larger than the support 481 of FIG. 19, and it may be fixed to the concrete member 430 by a plurality of embedded bolts 492 and 493 at the side surface.

[93] More preferably, a reinforcement angle bar 494 is connected between the upper surface and the side surface of the support 491 to cover the load on the upper surface of the support 491. Like the previous embodiment, the outer slab mold 495 of L-shape is installed on the upper surface of the support 491.

[94] When the installation of the composite concrete columns and the composite concrete crossbeams with molds are completed, concrete is put on the structure and cured.

[95] Additionally, when constructing upper storey, another composite concrete column is connected on the composite concrete column. Here, the composite concrete columns can be connected by welding ends of the H-beams 30. That is, since the additional composite concrete column has an H-beam or an embedded plate exposed at the lower end thereof, the H-beam or the embedded plate is welded to the upper end of the lower composite concrete column. At this time, the reinforcement bars may be linked with another bar by a mechanical splice.

Claims

[1] A composite concrete column comprising: upper and lower concrete column portions extending in the lengthwise direction and having an exposed portion between the upper and lower concrete column portions; an H-beam connected between the upper and lower concrete column portions to be exposed at the exposed portion; and a plurality of reinforcement bars embedded in the upper and lower concrete column portions around the H-beam to extend in the lengthwise direction.

[2] A composite concrete column comprising: an H-beam having a pair of flanges in parallel and a web connecting the pair of flanges each other; a pair of upper and lower concrete column portions formed on the side surfaces of the H-beam having an exposed portion between the upper and lower concrete column portions to face each other; and a plurality of reinforcement bars embedded in the upper and lower concrete column portions around the H-beam to extend in the lengthwise direction.

[3] The composite concrete column according to claim 1, wherein a plurality of brackets is formed on the side surface of the H-beam at the exposed portion.

[4] The composite concrete column according to claim 3, wherein a support portion is laterally extended from the upper surface of the concrete column portion.

[5] The composite concrete column according to claim 1, wherein both ends of the

H-beam are embedded in the concrete column portions.

[6] The composite concrete column according to claim 5, wherein a plurality of studs is provided on the side surface of the H-beam at the portion embedded in the concrete column portions.

[7] The composite concrete column according to claim 1, further comprising embedded plates embedded in the lower end of the upper concrete column portion and the upper end of the lower concrete column portion with its one sides exposed, and wherein both ends of the H-beam are connected to the one sides of the embedded plates.

[8] The composite concrete column according to claim 1, wherein the H-beam is embedded in the concrete column portions through the whole length of the concrete column portions.

[9] The composite concrete column according to claim 1, wherein a cavity is formed in the concrete column portions.

[10] A construction method comprising the following steps of: installing composite concrete columns including upper and lower concrete column portions extending in the lengthwise direction with having an exposed portion between the upper and lower concrete column portions, an H-beam connected between the upper and lower concrete column portions to be exposed at the exposed portion, and a plurality of reinforcement bars embedded in the upper and lower concrete column portions around the H-beam to extend in the lengthwise direction; connecting ends of crossbeams to the H-beam at the exposed portion of the composite concrete columns; installing molds on the composite concrete columns and the crossbeams; and putting concrete on the molds and curing the same.

[11] A construction method comprising the following steps of: installing composite concrete columns including an H-beam having a pair of flanges in parallel and a web connecting the pair of flanges each other, a pair of upper and lower concrete column portions formed on the side surfaces of the H- beam having an exposed portion between the upper and lower concrete column portions to face each other, and a plurality of reinforcement bars embedded in the upper and lower concrete column portions around the H-beam to extend in the lengthwise direction; connecting ends of crossbeams to the H-beam at the exposed portion of the composite concrete columns; installing molds on the composite concrete columns and the crossbeams; and putting concrete on the molds and curing the same.

[12] The construction method according to claim 10, wherein a plurality of brackets is formed on the side surface of the H-beam at the exposed portion, and wherein the ends of the crossbeams are connected with the brackets.

[13] The construction method according to claim 12, wherein a support portion is laterally extended from the upper surface of the concrete column portion, and wherein the ends of crossbeams rest on the support portion.

[14] The construction method according to claim 13, wherein the crossbeam is a composite concrete crossbeam comprising: an H-beam; stirrup bars installed at a predetermined interval along the H-beam; and concrete member embedding at least a portion of the H-beam, and wherein a front end of the concrete member of the composite concrete crossbeam rest on the support portion.

[15] The construction method according to claim 14, wherein a crossbeam installed on the outer portion of a wall comprises a support provided on the edge of the upper surface of the concrete member, and wherein an outer slab mold having a section of L-shape is installed on the support. [16] The construction method according to claim 14, wherein a crossbeam installed on the outer portion of a wall comprises a support provided on the edge of the upper surface of the concrete member, and a reinforcement angle bar connected between the upper surface and the side surface of the support, and wherein an outer slab mold having a section of L-shape is installed on the support. [17] The construction method according to claim 10, wherein both ends of the H- beam are embedded in the concrete column portions. [18] The construction method according to claim 17, wherein a plurality of studs is provided on the side surface of the H-beam at the portion embedded in the concrete column portions. [19] The construction method according to claim 10, embedded plates embedded in the lower end of the upper concrete column portion and the upper end of the lower concrete column portion with its one sides exposed are provided, and wherein both ends of the H-beam are connected to the one sides of the embedded plates. [20] The construction method according to claim 10, wherein the H-beam is embedded in the concrete column portions through the whole length of the concrete column portions. [21] The construction method according to claim 20, wherein a cavity is formed in the concrete column portions. [22] The construction method according to claim 10, wherein the crossbeams connected with the composite concrete columns are fastened each other by a traverse reinforcement member.