KR101791595B1 - Long-span composite beam using circular steel pipe for slim floor and the construction method therefor - Google Patents

Abstract

It is possible to install the intermediate column according to the long span in the construction to connect the composite beams between the column structures and to reduce the floor height. It is also possible to use the circular tube using the circular tube which is useful for the local buckling and transverse buckling, And more particularly, to a long span, height-reduced composite beam and a construction method thereof. By using the lower flange and the circular pipe, which are high-strength steel plates at the lower part of the tensile side, the combined view is advantageous for local buckling or transverse buckling deformation while advantageously reducing the weight of the bottom plate by reducing the amount of decking of the bottom plate concrete by reducing the amount of decking The circular tube can be provided with a long span layer height reduction type composite beam using a circular tube which is easy to secure deflection and vibration performance by using a lightweight filler in the function of the abdomen or bottom flange of the composite beam and its construction method.

Description

TECHNICAL FIELD [0001] The present invention relates to a long span floor-height reduction type composite beam using a circular tube, and a method of constructing the same. BACKGROUND ART < RTI ID = 0.0 >

The present invention relates to a long span floor height reduction type composite beam using a circular tube and a construction method thereof. More specifically, it is possible to install the intermediate column according to the long span in the construction in which the composite beams are connected between the column structures, and it is possible to reduce the floor height, and it is advantageous in local buckling and transverse buckling deformation, The present invention relates to a long span layer height reduction type composite beam using a pipe and a method of construction thereof.

Composite composite beams used for long span implementation can be classified into embedded type composite beams completely enclosed by concrete and exposed composite beams maximizing moment performance by applying composite slabs on top of steel beams.

In the case of the above-mentioned embedded type composite beam, if the specified coating thickness is satisfied, the complete composite behavior is obtained even if there is no separate shear connection material. However, since the construction is disadvantageous in terms of workability and economy,

In addition, the concrete type slab is installed on the upper part of the steel beam to maximize the moment performance, and it can be used in a relatively long span with light load and high rigidity.

However, since the slab is installed on the upper part of the steel beam, the stratification is increased and there are problems such as refractory coating, compression flange on the steel beam and local buckling of the web.

Conventionally, in the case of construction of a parking lot for a workpiece, for example, a long span structure technique of reducing the floor height (2.65 m or less) is required in order to secure the parking space of the third floor and the fourth floor. The parking part is designed to be 550 mm, There is a limit to doing so.

That is, as shown in FIG. 1A, an example in which the tension between the ends of the steel beam 50 is subjected to a small cross-sectional process while the tension member for introducing the prestress is used at the intermediate portion is disclosed. However, , It is known that it is difficult to secure the usability due to the deterioration of the vibration performance at the time of moving the vehicle.

Further, as shown in FIG. 1B, a slim floor method comprising an asymmetric steel beam having a wider width of the lower flange of the steel beam 31 is applied to reduce the height of the steel beam, or a box- (60) is also used.

However, there is a problem in that it is not suitable to apply to the construction of a parking lot because there is a problem of refractory coating, difficulty in securing rigidity, and difficulty in manufacturing.

1C is a construction cross-sectional view of a prior art height reduction composite type composite beam.

A side vertical portion 12 vertically bent upward from one end of the bottom portion 11 and a horizontal portion 12 horizontally bent at the upper end of the side vertical portion 12, A first lower molded steel plate 10a formed to have a first central vertical portion 14 vertically bent upward from the other side end of the bottom portion 11;

The first lower molded steel plate 10 has a symmetrical or asymmetric sectional shape with respect to the first lower molded steel plate 10 and is disposed symmetrically with respect to the first central vertical portion 14 of the first lower molded steel plate 10, A second lower molded steel plate 10b joined to the first lower molded steel plate 10b;

And a second central vertical portion 22 bent downward from the one end of the upper surface portion 21 vertically downwardly so as to have a first central portion 22 of the first lower molded steel plate 10a, A first upper molded steel plate 20a joined to one side of the upper portion of the vertical portion 14;

The first upper molded steel plate 20a is symmetrically arranged with respect to the second central vertical portion 22 of the first upper molded steel plate 20a and has a symmetrical or asymmetric sectional shape with respect to the first upper molded steel plate 20a, A second upper molded steel plate 20b joined to the other upper side of the first central vertical portion 14 of the steel plate 10b;

The deck plate 30 and the slab concrete 40 placed inside the composite beam.

In other words, although it is possible to easily produce a composite beam using a plurality of molded steel plates, the first central vertical portion 14 and the second central vertical portion 22 are insufficient to contribute to the improvement of the whip stiffness of the composite beam, The support of the deck plate 30 caused by the deck plate 30 may become unstable, which is effective for reducing the height of the deck plate 30. However,

Korean Patent No. 10-1356245 (entitled "3-story, 4-story concrete slab long span workshop parking lot with a floor height reduction type", publication date: November 13, 2008) Korean Patent No. 10-0870068 (Name of the invention: Steel-concrete composite beam for slab height reduction and steel-plate for slab assembly, publication date: Jan. 29, 2014)

Accordingly, the present invention provides a composite bow that is integrated between the bottom plate and the bottom plate when the bottom plate concrete is poured, , And a method of providing a construction method of a long span floor height reduction type using a circular pipe which is advantageous for local buckling and transverse buckling deformation and easy to secure deflection and vibration performance by reducing the amount of concrete pouring on the bottom plate This is a problem to be solved.

In order to accomplish the above object, the present invention provides a long-span,

A sandwich type high strength lower flange using a circular tube which is subjected to a tensile stress by an acting load; Both sides of the upper surface of the sandwich-type high-strength lower flange using the circular tube are spaced apart from each other so that a lightweight filler can be filled inward, thereby forming an inner space S; A sandwich type high strength lower flange using the circular pipe, an EPS block formed to fill the inner space S of the double skin member, a lightweight filler including lightweight concrete, And a shear connection member provided on the sheathing concrete for composing the slab concrete to be inserted, the sandwich-type high strength lower flange using the circular pipe, the end face of the sheathing member being installed to be strong on the columnar structure, .

Also preferably,

A high strength lower flange bearing tensile stress by an acting load; The abdomen material being a circular tube whose side surfaces are in contact with the upper surface of the high strength lower flange; A high strength upper flange formed on the upper surface of the abdomen member which is the circular tube; And a shear connection member provided on the upper surface of the high strength upper flange for composing the slab concrete to be installed. The end surface of the high strength lower flange and the circular tubular member are provided so as to be strong against the column structure to reduce buckling and vibration .

According to an aspect of the present invention, there is provided a method of constructing a long span height reduction type composite beam using a circular tube,

(a) installing column spacers apart from each other, and arranging a long span layer height reduction type composite beam using a circular tube between the column structures, so that the end surface is strong on the side surface of the column structure; (b) installing a deck plate so as to be supported on the double-stitched member of the long span floor-height reduction type composite beam using the circular pipe; (c) placing the slab concrete in the inner space (S) between the upper surface of the high strength lower flange and the double sheathing to construct the slab, wherein the long span height reduction type synthesis using the circular tube of the step (a) It consists of a sandwich type high strength lower flange using a circular tube, a double sheathing material, an EPS block formed to fill the inner space (S), and a lightweight filler including lightweight concrete. .

Also preferably,

(a) installing column spacers apart from each other, and arranging a long span layer height reduction type composite beam using a circular tube between the column structures, so that the end surface is strong on the side surface of the column structure; (b) installing a deck plate to be supported by the high strength upper flange 150 formed on the upper surface of the abdomen member, which is a circular tube of the long span floor height reduction type composite bow using the circular pipe; (c) placing the slab concrete on the upper surface of the high-strength upper flange to construct a slab; and (c) stacking the slab concrete on the upper surface of the high-strength upper flange. The end face including the upper flange is installed so as to be strong against the column structure, so that buckling and vibration are reduced.

According to the present invention, a long span (for example, 16 m or more) in a parking lot having a limited building height (for example, 8 m or less) can be omitted, And to provide the construction method.

In addition, by using the lower flange and circular pipe, which are high strength steel plates at the lower part of the tensile side, it is advantageous for local buckling or transverse buckling deformation while advantageously reducing the weight of the bottom plate by reducing the amount of decking of the bottom plate concrete,

The circular pipe can be provided with a long span floor height reduction type composite box using a circular pipe which is easy to secure deflection and vibration performance by using a lightweight filler in functioning as an abdomen or a lower flange of a composite beam and a construction method thereof.

In addition, by adjusting the diameter and the number of installation of the circular pipe, it can be used as a high-strength lower flange and abdomen of a composite beam, so that a composite beam can be produced by a section favoring the strength and flexural rigidity.

In addition, since the construction can be easily performed with a simple structure, rapid construction can be performed. In particular, it is possible to provide a composite beam that is very advantageous for a parking lot of a workpiece having a limited building height (for example, 8 m or less).

FIG. 1A is a construction sectional view and a perspective view of a beam used in construction of a conventional work parking lot,
FIG. 1B is a construction sectional view of a beam used for constructing a conventional floor height reduction type parking lot,
1C is a construction cross-sectional view of a conventional floor height reduction type composite,
FIG. 2A is a perspective view of a long span floor height reduction type composite beam using a circular tube of the present invention,
FIG. 2B is a cross-sectional exemplary view of a long span layer height reduction type composite beam using the circular tube of the present invention,
2C is another cross-sectional view of a long span floor height reduction type composite beam using the shear connector and the circular tube of the present invention,
FIGS. 3A and 3B are construction cross-sectional views of a long span floor height reduction type composite beam and a slab using the circular pipe of the present invention,
FIGS. 4A and 4B are flowcharts of a long span layer height reduction type composite beam forming method using the circular tube of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

[Long span height reduction type composite beam using a circular tube (100)]

FIG. 2C is a perspective view of the long span layer height reduction type composite beam 100 using the circular tube according to the first and second embodiments of the present invention. FIG. 2C is a cross- Fig.

[Example 1: Long span height reduction type composite sheet (100) using a circular pipe as a lower flange)

The long span floor height reduction type composite beam 100 using the circular pipe as a lower flange is composed of a sandwich type high strength lower flange 110 using a circular tube, a belly member 120, a lightweight filler 130, (140).

The sandwich-type high-strength lower flange 110 using the circular pipe is formed in a sandwich form by disposing a circular pipe 112 between the high-strength steel plates 111.

In other words, since the lower flange of the composite beam generates tensile stress due to the applied load, it is advantageous to such a tensile stress resistance, but not to increase the self weight.

By using such a sandwich type high strength lower flange 110, it becomes possible to make the longest span of the composite beam.

At this time, the width of the sandwich-type high strength lower flange 110 is set so that the deck plate 200 is fixedly installed at both ends of the top surface of the double-stitched member 120 described later and the lightweight filler 130 ) To be filled, and is set to be less than absolute bending.

For example, the width of the sandwich-type high-strength lower flange 110 is determined so that the absolute height required for constructing the parking lot of a workpiece is 350 mm. In the present invention, the width of the lower flange is sufficiently secured, Strength high-strength lower flange 110 so as to secure a wide sandwich-type high-strength lower flange 110.

The end face of the sandwich type high strength lower flange 110 and a laterally described double stiffener 120 are tightly fixed to the column structure 400 and are sandwiched between the sandwich type high strength lower flange 110 and a later- The lightweight filler 130 is integrated into the inner space as it is installed in advance.

The double-stitched member 120 uses a channel member 121 extending upward from both upper ends of the high-strength lower flange 110 as a portion corresponding to the abdomen of the composite beam.

The use of the sandwich-type high-strength lower flange 110 and the double-stitch member 120 as the channel member 121 makes it possible to form a cross section that is very advantageous for local buckling or total lateral buckling of the composite beams, .

The upper and lower abdomen members 120 are positioned at both ends of the upper surface of the sandwich type high strength lower flange 110 so that an inner space S, which is an empty space, is formed between the upper surface of the sandwich type high strength lower flange 110 and the both abdomen members 120, Is formed.

At this time, it is possible to fill up the filler material 130 in the inside of the ventral square pipe 120. EPS block and lightweight concrete can be used to suppress deflection and vibration performance while suppressing an increase in self weight.

The lightweight filler 130 may be filled in the inner space S by the sandwich-type high strength lower flange 110 and the double-stitched member 120, and an EPS block, a lightweight concrete, or the like may be used.

If the weight of the composite beam is too small, the construction and economical aspects are advantageous. However, since it may be vulnerable to vibration and buckling, the lightweight filler enables local buckling and lateral buckling while reducing vibration.

The lightweight filler 130 is formed by filling the sandwich-type high strength lower flange 110 and the inner space S between the double skin members 120 in advance and then forming a composite beam on the column structure, And the slab concrete 320 is placed on the upper surface.

The shear connection member 140 is formed by sandwiching the high strength lower flange 110 of the sandwich type so as to be spaced apart from each other so that the slab concrete 320 is restrained when the slab concrete 320 is laid, Type composite beams 100 are combined with each other.

2A, since the deck plate 200 is mounted between the upper surfaces of the double-stitched member 120, the shear connecting member 140a having a U-shaped shape is used between the inner upper ends of the double stitched member 120, It is also possible to serve as a reinforcing member for reinforcing the upper end of the ash 120.

Further, as shown in FIG. 2C,

A shear connector 140b having an I-shaped cross section is disposed between the upper ends of the inside of the double-

A shear connection member 140c formed by bending both ends of one horizontal base 141 and bending upward toward the center of the horizontal base and horizontally extending from both sides of the horizontal bending plate 142,

It is possible to serve as a reinforcing member for reinforcing between the both deck plates 200 by using a shear connection member 140d in which C-shaped shear connection members are horizontally opposed to each other between upper ends of the inner side of the sheathing member 120 Able to know.

[Example 2: Long span height reduction type composite sheet (100) using circular tube as abdomen material)

2B, the long span layer height reduction type composite yarn 100 using the circular pipe as the abdomen material is composed of a high strength lower flange 160, a circular rib member 120, a high strength upper flange 150 and a shear connection member 140, .

The high strength lower flange 160 uses a high strength steel plate.

That is, since the high-strength lower flange 160 generates a tensile stress due to an applied load, a high-strength steel sheet having a certain thickness is used so as not to increase the self-weight while being advantageous to such tensile stress resistance.

At this time, the width of the high-strength lower flange 160 is ensured such that the abdomen member 120, which will be described later, is formed on the upper surface, and is set to be equal to or less than absolute height.

For example, the height of the high-strength lower flange 160 is determined to be less than the height of the high-strength lower flange 160 required for constructing the parking lot of the work, and in the present invention, the width of the lower flange is sufficiently secured, Strength lower flange 160 so as to secure a width at which the flange 160 can be installed.

The end faces of the high strength lower flange 160 and the abdomen member 120, which will be described later, are rounded and secured to the columnar structure 400.

The abdomen material 120, which is the circular pipe 122, is a portion corresponding to the abdomen of the synthetic bobbin, and a circular steel pipe is used which has a plurality of abutting surfaces on the upper surface of the high strength lower flange 110.

The use of the high-strength lower flange 110 and the abdomen member 120 as a circular tube has an advantage that a very advantageous cross-section can be formed for local buckling or total lateral buckling of the composite beams without a large self weight.

It can be seen that the abdomen member 120, which is a circular tube, is positioned on the upper surface of the high-strength lower flange 110, and in the case of FIG. 2A, the circular steel pipes are horizontally contacted with each other.

The high strength upper flange 150 uses the same high strength steel plate as the high strength lower flange 160.

That is, since the high strength upper flange 150 has a function of restricting the abdomen material 120, which is a circular tube, while the deck plate 200 is mounted on the upper surfaces of both side ends thereof, A high strength steel sheet having a constant thickness is used.

Thus, the circular abdomen material 120 is positioned between the high-strength lower flange 110 and the high-strength upper flange 150 to serve as the abdomen, and the diameter thereof can be adjusted to adjust the height of the cross- So that the load can be dispersed and resisted.

The upper end of the high-strength upper flange 150 has a shear connection member 140 fixed thereto.

2A, since the deck plate 200 is mounted on the upper surface of the high-strength upper flange 150, it can be seen that the C-shaped shear connector 140a is used at the center.

Further, as shown in FIG. 2C,

An I-shaped cross-section shear connector 140b,

A front end connection member 140c formed by bending both ends of one horizontal base 141 on the upper surface of the high strength upper flange 150 and bending upward toward the center of the horizontal base and horizontally extending from both sides of the horizontal flange 150,

A shear connection member 140d formed by connecting a C-shaped shear connection member on the upper surface of the high-strength upper flange 150 so as to face each other horizontally,

It can be seen that the T-shaped shear connector 140e is used on the upper surface of the high strength upper flange 150.

[Long span floor-height reduction type composite beam 100 and slab 300 using a circular tube]

3A and 3B are construction cross-sectional views of the long span floor height reduction type composite beam 100 and the slab 300 using the circular pipe of the present invention.

3A and 3B will be referred to as the long span floor height reduction type composite beam 100 using the circular tube according to the first and second embodiments, respectively.

First, referring to FIG. 3A,

The double-stranded member 120 is fixed on both sides of the upper surface of the sandwich-type high-strength lower flange 110 using the circular tube of the long-span stratum-saving composite beam 100 using the circular tube, .

Further, it is possible to install the deck plate 200 on both sides of the upper surface of the double-stitched member 120 so that stable construction can be performed.

It is understood that the lightweight filler 130 is filled in the inner space S between the both abdomen members 120 and is formed on the upper surface of the abdomen member 120.

Accordingly, the shear connection member 140 restrains the two dam members 120 from each other while preventing the deck plate from being deformed when the slab concrete 320 is installed. Able to know.

The long span floor height reduction type composite beam 100 and the slab 300 (see FIG. 1) using a round pipe by the sandwich type high strength lower flange 110, the abdomen material 120, the lightweight filler material 130 and the shear connection material 140 using the circular pipe, ) Are structurally completely integrated and synthesized with each other.

Therefore, the sandwich-type high-strength lower flange 110 using the circular tube is mainly responsible for the tensile stress due to the working load. The double-stitched member 120 is sandwiched between the deck plate 200 and the load- The lightweight filler 130 can effectively resist buckling and reduce the noise caused by vibrations while transmitting to the high strength lower flange 110. The absolute dancing of the long span height reduction type composite bow 100 using the circular tube It is possible to construct a parking lot of a working structure capable of ensuring workability and economical efficiency.

Next, referring to FIG. 3B,

A circular stiff abdomen material 120 is fixedly mounted on the upper surface of a high strength lower flange 160 of a long span height reduction type composite brace 100 using a circular tube and a high strength upper flange 150 It can be seen that it can be formed in a very simple structure.

Further, it is possible to install the deck plate 200 on both sides of the upper surface of the high strength upper flange 150, so that stable construction is possible.

Accordingly, the shear connector 140 is located on the upper surface of the high-strength upper flange 150, so that it is possible to prevent mutual deformation when the slab concrete 320 is placed.

The long span floor height reduction type composite beam 100 and the slab 300 using the circular tube by the high strength lower flange 160, the circular tube 120, the high strength upper flange 150, It can be understood that they are structurally completely integrated and synthesized.

The high strength upper flange 150 is designed to load the deck plate 200 while the load is applied to the abdomen material 120 and the high strength lower flange 150 110), it is possible to effectively suppress the buckling while reducing the noise caused by the vibration, thereby ensuring sufficient workability and economical efficiency while ensuring absolute dancing (350 mm) of the long span floor height reduction type composite bow 100 using the circular tube It is possible to construct a parking lot of a machine tool structure.

[Method for constructing a long span floor-height composite beam using a circular tube]

FIGS. 4A and 4B show a flowchart of a long span layer height reduction type composite beam forming method using a circular tube. This is based on the construction of the parking lot of the work structure.

First, as shown in FIG. 4A, the column structures 400 are spaced apart from each other. The pillar structure 400 may be a steel structure having a height of about three layers, and an extension length of one span is determined in consideration of the extension length of the long span floor height reduction type composite beam using the circular pipe of the present invention do.

The long span layer height reduction type composite beam 100 using the circular tube according to the first or second embodiment is installed between the column structures 400 so that the end surface is strong on the side of the column structure 400 You can do it.

The long span floor height reduction type composite beam 100 using such a circular pipe

In the case of the first embodiment, the sandwich type high strength lower flange 110 using the circular tube, the abdomen material 120, the light filler material 130, and the shear connection material 140 may be used.

In the case of the second embodiment, it is possible to use a structure including the high-strength lower flange 160, the circular tube member 120, the high-strength upper flange 150 and the shear connector 140.

Next, as shown in FIG. 4B, the deck plate 200 is installed to support the ends of the long span height reduction type composite bow 100 using the circular tube. Such a deck plate may have various cross-sectional shapes.

In the case of Embodiment 1, it can be mounted on both side ends of the upper surface of the double-stitched member 120,

In the case of the second embodiment, the high strength upper flange 150 may be mounted on both upper ends of the upper surface.

Next, the slab concrete 320

In the case of Embodiment 1, the upper surface of the inner space of the double-stitched member 120 and the upper surface of the deck plate

In the case of the second embodiment, the upper surface of the high-strength upper flange 150 and the upper surface of the deck plate are laid with a predetermined thickness to construct the slab 300, thereby enabling the parking lot of the final working structure to be constructed. This makes it possible to construct a more effective parking lot for a working structure.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

100: Long span floor height reduction type composite using circular tube as bottom flange
110: Sandwich type high strength lower flange using circular tube
120: abdomen material 121: channel member
130: lightweight filler 122: circular tube
140: shear connector 150: high strength upper flange
160: high strength lower flange 200: deck plate
300: slab 320: slab concrete
400: column structure

Claims (14)

A sandwich type high strength lower flange (110) using a circular tube to bear a tensile stress due to an applied load;
Both sides of the upper surface of the sandwich-type high-strength lower flange 110 using the circular tube are spaced apart from each other so as to fill the light filler 130 inwardly to form an inner space S;
A sandwich-type high-strength lower flange 110 using the circular tube, an EPS block formed to fill the inner space S of the double-stitched member 120, a lightweight filler 130 including lightweight concrete, And
And a shear connection member (140) installed on the sheathing member (120) for composing the slab concrete (320)
The sandwich-type high-strength lower flange 110 using the circular pipe and the end face of the double-stitched member 120 are installed to be strong against the columnar structure 400 to reduce buckling and vibration,
The sandwich-type high-strength lower flange 110 using the circular pipe is a circular pipe which is formed in a sandwich form by arranging a circular pipe 112 between the high-strength steel plates 111 so as not to increase the self-weight, Span Span Height Reduction Composite Beam Used. A high strength lower flange 160 that is subjected to tensile stress by an applied load;
An abdomen member 120, which is a circular tube formed on the upper surface of the high-strength lower flange 160 so as to be in side contact with each other;
A high strength upper flange 150 formed on the upper surface of the circular tube 120;
And a shear connection member (140) installed on the upper surface of the high strength upper flange (150) for synthesis with the slab concrete (320)
The end face of the high strength lower flange 160 and the abdomen member 120, which is a circular tube, is installed to be strong against the columnar structure 400 to reduce buckling and vibration,
The circular abutment member 120 is positioned between the high strength lower flange 110 and the high strength upper flange 150 so as to serve as the abdomen member and adjust the diameter to adjust the height of the cross section of the composite beam. Span span height reduction type composite beam using circular tube to distribute load by placing. delete delete The method according to claim 1,
The deck plate 200 is formed on the top surface of the double-stitched member 120 by using channel members spaced apart from each other so as to extend upward from both upper ends of the sandwich-type high-strength lower flange 110, A span span height reduction type composite beam using a circular tube to support the end of the span. 3. The method of claim 2,
A high strength upper flange 150 is formed on the upper surface of the circular steel pipe to form a circular steel pipe abdomen material between the high strength upper flange and the high strength lower flange,
And the end of the deck plate (200) is supported on the upper surface of the high strength upper flange. The method according to claim 1,
The lightweight filler 130 is formed in advance in the lower part of the inner space S between the upper surface of the sandwich-type high strength lower flange 110 and the double skin member 120 using the circular pipe, , And a circular tube for placing the slab concrete (320) on the upper surface of the lightweight filler. The method according to claim 1,
The shear connector (140)
A U-shaped shear connector 140a between the inner upper end of the sheathing member 120;
A shear connector 140b having an I-shaped cross section between the inner upper end of the sheathing member 120;
A shear connection member 140c formed by bending both ends of one horizontal base 141 and bending upwardly toward the center of the horizontal base and horizontally extending laterally both sides between the upper ends of the inside of the double sheathing member 120; or
A span span height reduction type composite beam using a circular tube using a shear connection member (140d) in which a C-shaped shear connection member is horizontally opposed to each other between upper ends of the inner side of the double sheathing member (120). 3. The method of claim 2,
The shear connector (140)
A U-shaped shear connector 140a between the inner upper end of the sheathing member 120;
A shear connector 140b having an I-shaped cross section between the inner upper end of the sheathing member 120;
A shear connection member 140c formed by bending both ends of one horizontal base 141 and bending upwardly toward the center of the horizontal base and horizontally extending laterally both sides between the upper ends of the inside of the double sheathing member 120;
A shear connection member 140d connecting the upper ends of the U-shaped member 120 to the upper ends of the U-shaped members 120 so as to face each other horizontally; or
A span span height reduction type composite beam using a circular tube using a T-shaped shear connection member (140e) on the upper surface of a high strength upper flange (150). (a) The column structure 400 is separated from the column structure 400, and then the long span layer height reduction type composite beam 100 using the circular tube of the first clause is installed between the column structures 400, A step of making the side surface strong;
(b) installing a deck plate (200) so as to be supported on the double-stitched member (120) of the long span floor height reduction type composite beam (100) using the circular tube;
(c) installing the slabs 300 by placing the slab concrete 320 in the inner space S between the upper surface of the high-strength lower flange 110 and the double-stiffener member 120,
The long span layer height reduction type composite beam 100 using the circular tube in the step (a)
A sandwich-type high strength lower flange 110 using a circular tube, a double sheathing member 120, an EPS block formed to be filled in the inner space S, and a lightweight filler 130 including lightweight concrete, (400) so that buckling and vibration are reduced by using a circular tube. (a) The column structures 400 are spaced apart from each other. Then, the long span layer height reduction type composite beam 100 using the circular tube of the second paragraph is installed between the column structures 400, A step of making the side surface strong;
(b) installing a deck plate (200) so as to be supported on a high strength upper flange (150) formed on the upper surface of the abdomen member, which is a circular tube of the long span height reduction type composite bowls (100) using the circular pipe;
(c) placing the slab concrete (320) on the upper surface of the high-strength upper flange (150) to construct the slab (300)
The long span layer height reduction type composite beam 100 using the circular tube in the step (a)
A long span is formed by using a circular tube which is installed so that an end face thereof is strong against the columnar structure 400 to reduce buckling and vibration, including a high-strength lower flange 110, a circular tube 120, and a high-strength upper flange 160. [ A method of constructing a composite beam. 11. The method of claim 10,
The long span floor height reduction type composite beam 100 using the circular tube in the step (a)
The lightweight filler 130 is first filled in the inner space S between the upper surface of the sandwich type high strength lower flange 110 using the circular tube and the double skin member 120 to be integrated therewith, And a slab concrete (320) is formed on the upper surface of the lightweight filler in the inner space. 11. The method of claim 10,
The double-stitched member 120 constituting the long span floor-height reduction type composite bow using the circular tube of the step (a) is formed in a circular shape in which the end portions of the deck plate 200 are supported on both sides of the upper surface, Span - span height reduction type composite beam construction method using pipes. delete

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