KR20150130099A - Steel and concrete composite segment for through bridge, and bridge construction method using the same - Google Patents

Abstract

Disclosed is a steel composite hollow segment for a through bridge and a construction method of a bridge using the same comprising: both side beams manufactured in a box-shape by assembling bent steel plates to form a hollow part(s), including a bent hollow box body and longitudinal tendons arranged around the bent hollow box body, and manufactured using concrete; and a transverse slab formed between a bottom inner sides of the side beams to be extended in a transverse direction, including a bent hollow box body arranged to be extended in a longitudinal direction and a longitudinal steel beam arranged between the bent hollow box bodies, and manufactured using concrete. As such, the present invention enables rapid and efficient construction by minimizing a weight of the segment.

Description

STEEL AND CONCRETE COMPOSITE SEGMENT FOR THROUGH BRIDGE, AND BRIDGE CONSTRUCTION METHOD USING THE SAME BACKGROUND OF THE INVENTION [0001]

The present invention relates to a steel composite hollow segment for hanging and a bridge construction method using the same. More particularly, the present invention relates to a steel composite hollow segment for a hanging bridge, which can be manufactured by a long span of segments including both side beams and slabs and has a small weight, and is excellent in workability, and a bridge construction method using the hollow segment.

THROUGH BRIDGE is the bridge type according to the location of the slab.

In other words, the lower bridge is a bridge in which the slab (road surface) is positioned below the longitudinal girder.

Recently, the bridges that have been applied in this way are the U-type bridge bridges (UCBs) used in light rail construction.

1A is a cross-sectional view of the PSC girder bridge 20 in comparison with the lower cross-sectional channel bridge 10 (UCB). The lower cross-sectional shape of the PSC girder bridge is advantageous for securing visibility while traveling, There is an advantage that construction work and construction cost can be reduced. (It can be seen that the shape of the lower bridge is very low, so it can be very big compared to the girder bridge which is a sagittal bridge.)

As a conventional construction method of such a channel bridge, a U-shaped segment for a channel bridge can be installed as a full-staging method. In such a case, it is necessary to install a provisional system such as a horseshoe, Were often too large.

In particular, the preflex beam 40 is manufactured by forming a protruding portion 42 horizontally protruding from the bottom of each inner side of the lower flange concrete 41, The precast concrete slab 50 is placed on the slab 42,

The pre-cast concrete slab 50 and the pre-flex beam 40 are connected to each other by the projecting reinforcing bars 43 and 44, and a portion to which the projecting reinforcing bars 43 and 44 are connected is finished with concrete 45 And how to make a halos bridge.

Such a hanging bridge manufacturing is distinguished from the conventional method of manufacturing the pre-cast type U-shaped segment 10 connected to each other in the longitudinal direction. However, when the weight of the slab and the live load act on the protruding portion 42, .

In this case, a halo bridge as shown in FIG. 1C has been introduced.

That is, the both side beams 60 are disposed in the lateral direction, and a plurality of the lateral slabs 70 having a predetermined transverse length are installed in the longitudinal direction.

In order to allow the side beams 60 to bear the load of the transverse slab 70, the side beams 60 are arranged such that both ends of the upper support 61 and the transverse slab 70 are supported by the upper supports 61 So as to form the support step 63. [0053] As shown in FIG.

The height of the lower support 62 of the side beam 60 should be set to a predetermined height H1 so as to support the load of the lateral slab 70 and the load of the lateral slab 70 Since the side beams 60 are burdened, the height H2 of the side beams 60 has to be secured to a considerable extent.

In order to optimize the cross-section of the side beam 60, it is very important to arrange the tension member 80 extending in the longitudinal direction and to construct the side beam 60 such as embedding the EPS block 64 in order to reduce its own weight .

The downshifting using the side beams 60 and the lateral slabs 70 may be one span depending on the site conditions, but may be formed to be wide in the lateral direction.

The lateral length L4 of the transverse slab 70 must also be large. When the length L4 of the transverse slab 70 needs to be approximately 15 m or more, the weight of the side slab 70 is excessively increased, The cross-sectional size of the cross-sectional area of the cross-sectional area of the cross-

The height H2 of the side beam 60 and the height H1 of the lower support 62 of the side beam 60 must also be increased as the lateral length L4 of the lateral slab 7 becomes larger As a result, there is a problem that the merit of the Halo Bridge can not be increased.

Therefore, the cross-section of the side beam 60 must be minimized in the lower bridge where the horizontal width should be widened. However, there is a limit in minimizing the cross-section of the side beam due to the characteristics of the lower bridge.

In addition, in the case of using the downhill segment (one segment) in which the side beam 60 and the lateral slab 70 are integrally formed between the bridge piers and the bridge piers, the self weight is excessively large, The thickness of the side wall beam 70 and the height of the cross section of the side beam 60 are excessively increased, so that it is practically difficult to construct a bridge using the downhill segment.

Accordingly, the present invention can minimize the weight of the steel rod by installing the side beam and the lateral slab in a single segment, and can minimize the weight of the steel rod. Therefore, a steel composite hollow segment for a hanging bridge can be constructed more quickly and efficiently, It is a technical task to solve the provision of public law.

In order to achieve the above object,

First, the segment for the downhole is made of a steel composite hollow segment. In other words, since it is installed between the long slopes, a large number of hollow parts are formed in order to secure sufficient bending stiffness while minimizing the increase of self weight due to concrete. In order to show the flexural rigidity, steel beams are buried in the lateral slab And the PC stranded wire is arranged around the hollow portion in the both side beams so that the prestress is introduced. Accordingly, the segment for off-shoring of the present invention is referred to as a steel-synthesized hollow segment for hanging.

Therefore, the steel composite hollow segment for downhole is constructed so as to be integrally mounted between the bridge piers and the alternating beams in a U-shaped section, and both side beams are installed first, and a horizontal slab is not separately installed between the side beams, As a steel composite hollow segment, by installation by launching.

Secondly, a hollow portion S is formed inside the side beam and the lateral slab. In the past, the hollow portion S was formed by embedding an ESP block in order to exclude concrete to be laid. Since it is not installed on the assumption of load sharing, it has merely a function of excluding concrete.

Accordingly, the hollow part S is formed as a hollow box so that the hollow part S can function as a structural member. Further, the hollow box body is formed by using a corrugated steel plate or a steel plate for a deck without assembling a steel plate, and assembling the bent or embossed steel plate to form a box body (hereinafter referred to as a bending hollow box body).

The side beams and the lateral slabs of the present invention are designed such that the folded hollow box body is embedded therein and the longitudinal torsion material is disposed around the folded hollow box body so that the prestress is introduced to optimize the cross section, .

Third, according to the present invention, when the bent hollow box body is positioned inside both side beams and the transverse slab and is constructed by pouring concrete in a state where they are constrained by a bracing member, the longitudinal extension length is adjusted to the span of the lower bridge And the lateral width can be used as one U-shaped cross-section segment in consideration of the lane of the lower bridge. At this time, since the bracing member and the bending hollow box body are all made of steel, the steel composite hollow segment for hanging according to the present invention does not include the inner reinforcing bars, thereby enabling quick and efficient manufacture.

The present invention is a steel composite hollow segment for downhole that minimizes its own weight and can eliminate the concrete and the inner reinforcing bars, but can sufficiently secure the required bending stiffness by the bent hollow box and the PC stranded wire It is possible to construct a long-span bridge easily and quickly.

If it is not long-span, it can be installed between piers and alternations by using a crane, etc. If it is for long-span, it can be installed by one span (one kind of ILM system) using launching equipment.

FIG. 1A shows a comparison between a conventional lower bridge and a girder bridge
1B is a cross-sectional view of a conventional steel composite segment for downhole,
FIG. 1C is a perspective view of a conventional halos, which is manufactured by separating the two side beams and the lateral slab,
FIGS. 2A and 2B are a perspective view and a completed perspective view of a steel composite hollow segment for hanging,
FIGS. 3A and 3B are views showing a construction sequence of a steel composite hollow segment for downhole according to Embodiment 1 of the present invention,
Figs. 4A to 4J are views showing a construction sequence of a steel composite hollow segment for downhole according to Embodiment 2 of the present invention, Fig.
5A and 5B are a perspective view and a construction cross-sectional view of the segment launching apparatus of the present invention used in the second embodiment.

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.

[Steel Composite Hollow Segment for Halo Bridge (400)]

FIG. 2 (a) is a perspective view of a steel composite hollow segment 400 for a downhill bridge, and FIG. 2 (b) is a completed perspective view of a steel composite hollow segment 400 for a downhill bridge.

The steel composite hollow segment 400 for downhole is manufactured such that the both side beams 410 and the lateral slabs 420 are integrally formed with each other to have a U-shaped cross section and a constant longitudinal length L as a whole.

The side beam 410 is a vertical beam and is a concrete beam having a lateral width W2 when it has a sectional height H2. In the inside of the side beam 410, a hollow hollow box body 430 extending in the longitudinal direction is formed. A hollow portion S is formed to exclude the concrete by the hollow portion to reduce the weight of the side beam 410 .

The bent hollow box body 430 may be formed in the form of a rectangular box body, which is formed of a folded hollow box body formed in a plurality of vertical directions rather than a general steel plate.

Since the bending stiffness is increased more than the general steel plate by the bending portion when the bending portion is formed as described above, it is possible to optimize the cross section of the side beam 410 because it is advantageous in securing the bending stiffness even if the same amount of steel is used.

In addition, because it is made of bended steel plate, it also acts as an inner reinforcing bar itself, so that it is possible to exclude the work of laying an inner reinforcing bar, which is complicated and poor in workability, in the side beam.

The longitudinal torsion members 440 can be disposed along the entire circumference of the folded hollow box body 430 because they can resist the local stress at the fixing site by the longitudinal torsion members 440 disposed around the longitudinal torsion members 440, The use of the tension member 440 becomes possible.

Therefore, even if the hollow hollow box body 430 is used, the economical efficiency can be sufficiently secured.

The side beams 410 are formed at positions spaced apart from each other in a transverse direction, and a transverse slab 420 is formed between the inside of the lower ends to have a constant thickness.

Since the lateral slab 420 is subjected to a live load by a vehicle or the like in the bridge, a certain thickness T must be secured. The live load caused by the train is repetitively applied, And these longitudinal steel beams 450 are arranged to extend longitudinally apart from one another transversely to the interior of the transverse slabs 420.

The longitudinal steel beams 450 are installed in a manner that they are filled with concrete using I-shaped steel.

At this time, a longitudinally extending hollow box body 430 extending in the longitudinal direction is also disposed between the longitudinal steel beams 450 inside the lateral slabs 420.

The longitudinal width W1 of the transverse slab 420 is increased to increase the weight of the concrete due to the weight of the concrete being laid. In order to secure the flexural rigidity of the present invention, The hollow box body 430 is disposed.

The bent hollow box body 430 may be formed of a plurality of bent portions formed in a vertical direction rather than a general steel plate.

It can be seen that the hollow box body 430 of the side beam 410 is different from the hollow box body 430 of the side beam 410 in that the hollow box body 430 is formed in a shape larger than the height since it is disposed only inside the lateral slab 420.

Accordingly, the bending hollow box body 430 is formed in the shape of a rectangular box body. The hollow box body 430 may be formed as a hollow body, but it may be further formed of an internal bracing material to be more suitable for long span.

2A and 2B, it can be seen that a folded hollow box body 430 having a height greater than the width is formed at the center of the lateral slab 420, and the lateral width of the lateral slab 420 is increased The central beam 460 having a larger cross-sectional height is formed in the middle, so that the flexural rigidity of the lateral slab 420 can be more effectively secured.

It can be seen that the center beam 460 is formed to have a smaller sectional height than the both side beams and that the longitudinal tension member 440 is also arranged around the folded hollow box body 430.

In addition, the center beam 460 serves as a central separating part in the bridge, and a vehicle or the like passes between the side beams 410 and the center beam 460.

Therefore, it can be seen that the steel composite hollow segment 400 for downhole according to the present invention is for downhole since the horizontal slab is located below the both side beams, and one steel composite hollow segment 400 for hang- The construction is carried out by extrusion.

In addition, the steel composite hollow segment 400 for downhole according to the present invention is manufactured in advance in the field, and the frame connection plate 470 is used to connect and constrain each of the hollow hollow box bodies 430 to each other.

This frame connection plate 470 also plays the role of an inner reinforcement in the transverse slab 420 together with the bending hollow box body 430 and the longitudinal steel beam 440, It is possible to exclude the operation of placing the inner reinforcement in the side beam 410.

Thus, the steel composite hollow segment 400 for downhole according to the present invention is optimized to have a sectional configuration for reducing the weight due to the construction of one segment between the spans, but it is possible to sufficiently secure the flexural rigidity and the like, .

[Bridge Construction Method Using Steel Composite Hollow Segment for Halo Bridge]

3A and 3B are flowcharts of a bridge construction method using a steel composite hollow segment 400 for downhole according to the first embodiment,

4A and 4B are flowcharts of a bridge construction method using a steel composite hollow segment 400 for downhole according to the second embodiment,

5A and 5B are a perspective view and a construction sectional view of the segment launching apparatus according to the second embodiment of the present invention.

The difference between Example 1 and Example 2 is that the steel composite hollow segments 400 for the lowering for the lowering are alternately alternated, and the lifting and pumping method is used between the bridge portions.

[Example 1: Construction method of a bridge using a steel composite hollow segment for a hanging bridge]

In the construction method according to the first embodiment,

First, as shown in FIG. 3A, a pier bridge 320 and an alternation 330 are first constructed, and the steel composite hollow segment 400 for a hanging bridge as described above is fabricated.

Next, as shown in FIG. 3B, it can be seen that the girder bridge type construction is implemented by mounting the bridge between the bridge pier 320 and the alternation 330 using a lifting means such as a crane.

After the steel composite hollow segment 400 for hanging is placed in this way, a packing layer or the like is formed to complete the final hanging installation.

[Example 2: Construction method of a bridge using a steel composite hollow segment for a hanging bridge]

Next, according to the second embodiment, when the steel composite hollow segment 400 for downhole can not be hoisted and can not be mounted, a steel composite hollow segment 400 for a hanging bridge is prepared in advance at a work site such as an alternate, The steel composite hollow segment 400 is extruded.

As shown in FIG. 4A, the bridge 320 and the alternation 330 are first constructed and the steel composite hollow segment 400 for a hanging bridge according to the present invention is manufactured in the manufacturing site behind the alternation 330.

As shown in FIG. 4A, the up-down hydraulic cylinders 350 at the back of the alternator are respectively installed at the corners of the alternation 320 and the bridge 330 and are raised upward in the bridge 330.

Subsequently, the up-down hydraulic cylinder 350 receives the steel composite hollow segment 400 for descending and then descends to mount the steel composite hollow segment 400 for descending to the upper surface of the bridge on the bridge 330 .

The up-down hydraulic cylinder 350 is temporarily installed at the corners of the alternation 320 or the pier 330 before the steel composite hollow segment 400 for the lowering is launched, The segments 400 can be disassembled and recovered after all the bridge columns 330 are installed.

Next, the segment launching apparatus 100 is installed on the first pier 330a. More specifically, as shown in FIG. 4B, the segment launcher 100 advances in a state where it is spaced on the alternate 320 or pier 330 starting from the manufacturing site 500, (330a). As described later, the segment launching apparatus 100 sequentially launches at least one steel composite hollow segment 400a, 400b for descending over the bridge columns 330a, 330b while repeating forward and backward movement.

Next, as shown in FIG. 4C, the steel composite hollow segment 400a for the first lowering bridge is transferred onto the first bridge pier 330a by using the bridge transfer bogie 160 of the segment launching apparatus 100 .

Next, the up-down hydraulic cylinder 350 is raised to place the steel composite hollow segment 400a for first lowering down, and then the segment launching apparatus 100 is moved back to the fabrication site 500. [ 4D, after the up-down hydraulic cylinder 350 is lifted to mount the steel composite hollow segment 400a for the first lowering, the segment launching apparatus 100 is moved to the manufacturing site 500).

That is, the segment launching apparatus 100 advances to and is fixed to the pier 330 in a state where the steel composite hollow segment 400 for hanging is not mounted, The composite hollow segment 400 is moved back to the fabrication site 500 after the steel composite hollow segment 400 for hanging is installed on the bridge 330.

5A and 5B, the segment launching apparatus 100 includes a frame 110, a driving unit 120, a launching equipment fixing unit 130, a launching equipment operation unit 140, a driving engine 150, The bridge conveyance truck 160, the hydraulic cylinder mounting apparatus 170, the passageway ladder 180, the truck driving apparatus 190, the launching equipment conveying apparatus 210, the bogie stopper 220, the bridge fixing unit 230, A hydraulic cylinder mounting device rotation body 240, a hoist crane 250, and a frame connection portion 260. [

The frame 110 is extended and extended from the fabrication site 500 to be movable forward and backward and the driving unit 120 is installed on the frame 110.

The launching equipment fixing device 130 is installed at a front end of the frame 110 and is driven by a hydraulic cylinder to fix the frame 110 on the bridge 330.

The driving engine 150 is installed at both ends of the frame 110 and the launching equipment operation device 140 is installed at a front end of the frame 110 so that the frame 110 is rotated by the driving engine 150 And controls operation so as to move forward and backward from the fabrication site 500.

The bridge conveying bogie 160 is installed on the segment launching apparatus 100 to convey the steel composite hollow segment 400 for hanging onto the pier 330. The balancer driving device 190 is installed on the frame The bridge stopper stopper 220 is installed on the frame 110 to stop the bridge conveyance truck 160 at a predetermined position so as to stop the bridge conveyance truck 160. [ And the bridge fixing unit 230 is formed at the upper end of the bridge conveyance truck 160 so that the steel composite hollow segment 400 for the lowering is fixed on the bridge conveyance truck 160. [

The hydraulic cylinder attaching device 170 is mounted with a hydraulic cylinder for raising and lowering the launching equipment fixing device 130 and the hydraulic cylinder attaching device rotation body 240 rotates the hydraulic cylinder attaching device 170 .

Further, a launching equipment transfer device 210, a hoist crane 250 and a frame connecting part 260 may be formed below the segment launching device 100.

Next, as shown in FIG. 4E, the up-down hydraulic cylinder 350, which rests on the steel composite hollow segment 400a for downhole, is lowered.

Next, as shown in FIG. 4F, the steel composite hollow segment 400a for the first lowering hanging is installed on the first bridge pier 330a.

Next, as shown in FIG. 4G, the segment launching apparatus 100 is transferred from the manufacturing site 500 onto the second pier 330b.

Next, as shown in FIG. 4H, the steel composite hollow segment 400b for second lowering is transferred to the second bridge 330b using the bridge conveyance truck 160 of the segment launching apparatus 100 .

Next, as shown in FIG. 4I, the segment launching apparatus 100 is moved back to the fabrication site 500.

Next, as shown in FIG. 4J, the up-down hydraulic cylinder 350 on which the steel composite hollow segment 400b for downhole is placed is lowered to remove the steel composite hollow segment 400b for the second fall- And is installed on the second pier 330b.

As a result, according to the second embodiment of the present invention, the up-down hydraulic cylinder mounts the steel composite hollow segment for the downhill on the bridge pier, and the segment launching device repeatedly advances and reverses from the bridge production site, It is possible to easily launch the segments sequentially in the form of a pier, thereby avoiding the use of a conventional venting vent or a large beam launcher according to the prior art. In particular, the present invention can be applied to the construction of a small- or medium- have.

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: Segment launching device
110: frame 120:
130: launching equipment fixing device 140: launching equipment operation device
150: drive engine 160: bridge conveyance truck
170: hydraulic cylinder mounting device 180: ladder for passage
190: Balance drive device
210: launching equipment feeder 220: bogie stopper
230: bridge fixing part 240: hydraulic cylinder mounting device rotation body
250: Hoist crane 260: Frame connection
400: steel composite hollow segment for hanging
400a: Steel composite hollow segment for first lowering
400b: Steel composite hollow segment for second lowering
410: side beam 420: transverse slab
430: Bent hollow box body 440: Longitudinal tension member
450: longitudinal steel beam 460: center beam
470: Frame connection plate 500: Production line

Claims (9)

A folded hollow box body 430 arranged to extend in a longitudinal direction as a box body manufactured to form a hollow portion S by assembling a bent steel plate; And a longitudinal tensional material (440) disposed about the folded hollow box body (430); And
A bending hollow box body 430 formed to extend in the transverse direction between the lower inside of the both side beams 410 and to extend in the longitudinal direction; And a transverse slab (420) made of concrete including a longitudinal steel beam (450) disposed between the folded hollow box bodies (430). The method according to claim 1,
A frame connecting plate 470 including a bracing material is disposed between the bent hollow box body 430 and the bending hollow box body 430 to constrain the positions of the bent hollow box body 430, To be installed on the upper surface of the hollow synthetic rubber sheet. The method according to claim 1,
A folded hollow box body 430 arranged to extend in the longitudinal direction as a box body manufactured to form a hollow portion S by assembling a bent steel plate in the middle of the lateral slab 420; And a longitudinal tensional material (440) disposed about the folded hollow box body (430) to form a central beam (460) made of concrete. A folded hollow box body 430 arranged to extend in the longitudinal direction as a box body manufactured by assembling a bent steel plate to form a hollow portion S and a vertical tension member 430 disposed around the folded hollow box body 430, Side beam 410 made of concrete including the beam 440; A bending hollow box body 430 formed to extend in the transverse direction between the lower inside of the both side beams 410 and to extend in the longitudinal direction; A longitudinal steel beam 450 disposed between the folded hollow box bodies 430, and both side beams made of the concrete, and a hollow hollow box body 430 formed inside the lateral slabs, Fabricating a steel composite hollow segment (400) for downhole to include a horizontal slab (420) including a frame connection plate (470) including a bracing material between the folded hollow box bodies (430); And
And a step of vertically connecting the prepared steel composite hollow segments for hanging bridge 400 with the piers at alternate angles to each other in a longitudinal direction. In a hanging bridge construction method using a bridge launching equipment for launching a steel composite hollow segment for a hanging bridge (400) on a bridge pier (330)
a) installing the up-down hydraulic cylinder 350 at the first and second bridge columns 330a and 330b and inputting the bridge launching equipment 100 from the bridge manufacturing site 500;
b) transferring and installing the bridge launching equipment (100) on the first pier (330a);
c) using the bridge conveyance truck 160 of the bridge launching equipment 100, the steel composite hollow segment 400a for the first lowering bridging is transferred from the steel composite hollow segment 400 for the lowering bridge to the first bridge pier 330a, Lt; / RTI >
d) moving the up-down hydraulic cylinder 350 up to the steel composite hollow segment 400a for the first lowering and then backing the bridge launching equipment 100 to the fabrication site 500;
e) lowering the up-down hydraulic cylinder (350) resting on the steel composite hollow segment (400a) for the first lowering down;
f) installing the steel composite hollow segment (400a) for the first lowering over the first bridge pier (330a);
g) transferring the bridge launching equipment (100) from the fabrication site (500) onto a second bridge pier (330b) and installing it;
h) Using the bridge conveyance truck 160 of the bridge launching equipment 100, the steel composite hollow segment 400b for the second lowering bridge among the steel composite hollow segments 400 for the lowering is connected to the second bridge pier 330b ;
i) backing the bridge launching equipment (100) to the fabrication site (500); And
j) The up-down hydraulic cylinder 350 on which the steel composite hollow segment 400b for downhole is placed is lowered so that the steel composite hollow segment 400b for the second lowering down is installed on the second bridge 330b Step
, ≪ / RTI &
The bridge launching equipment 100 is configured to move at least one steel composite hollow segment 400a for downhole while repeatedly advancing and retreating in a state of being separated on the alternate 320 or bridge 330 starting from the manufacturing site 500 , And 400b are sequentially launched onto the bridge columns (330a, 330b) using a steel composite hollow segment for downhole. 6. The method of claim 5,
The up-down hydraulic cylinder 350 in the step a) is installed at each corner of the bridge pier 330 and rises upward in the bridge pier 330 to mount the steel composite hollow segment 400 for down- And a steel composite hollow segment for hanging is mounted on the concrete support base 340 on the bridge pier 330. [ The method according to claim 6,
The up-down hydraulic cylinder 350 is temporarily installed at each of the corners of the alternate 320 or pier 330 before the steel composite hollow segment 400 for lowering is launched, and the steel composite hollow segment for down- 400 are installed in the bridge pier 330 and then disassembled and recovered, the bridging construction method using the steel composite hollow segment for downhole. 6. The method of claim 5,
The bridge launching equipment 100 is advanced and fixed to the pier 330 in a state where the steel composite hollow segment 400 for hanging is not mounted, A method of constructing a bridge using a steel composite hollow segment for hauling that carries a segment (400) and moves back to the fabrication site (500) after the steel composite hollow segment (400) for hanging is installed on the bridge pier (330). The method according to claim 4 or 5,
The steel composite hollow segment 400 for downhole is formed by assembling a steel plate bent in the middle of the transverse slab 420 to form a hollow portion S and a bent hollow box body 430); And a longitudinal tensional material (440) disposed around the folded hollow box body (430). The bridge construction method using the steel composite hollow segment for downhole, wherein the central beam is made of concrete.

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