WO2012053730A1

WO2012053730A1 - Truss structure corresponding to the second moment of a support part and a production method for the same, and a truss bridge using the truss structure corresponding to the second moment of the support part and a method for constructing the same

Info

Publication number: WO2012053730A1
Application number: PCT/KR2011/004931
Authority: WO
Inventors: 최하정
Original assignee: Choi Ha Jung
Priority date: 2010-10-22
Filing date: 2011-07-06
Publication date: 2012-04-26
Also published as: KR101026118B1

Abstract

The present invention relates: to a truss structure corresponding to the second moment of a support part, whereby it is possible to efficiently increase strength and stiffness with respect to axial forces and the second moment by configuring an upper chord member so as to have an open section opening at the top as a plurality of I shapes or U shapes while at the same time joining transverse reinforcing bars in a fixing hole on the inside, and by providing ribs on the end part of the upper chord member in an internal support section while at the same time filling with concrete, and by then tensioning a steel material such that a tensile sectional force comes to act; and to a production method for the truss structure; and also to a truss bridge using the truss structure corresponding to the second moment of the support part; and to a method for constructing the truss bridge.

Description

Truss structure corresponding to the secondary moment of the point part and its manufacturing method and truss bridge using the truss structure corresponding to the secondary moment of the point part and its construction method

The present invention relates to a truss bridge having an open cross-section top chord with improved load capacity for secondary moments occurring at the point. More specifically, the top of the top chord is opened in a plurality of 'I' or 'U' shapes. It is composed of open section, which extends the phase chord to the upper edge of the bottom plate to increase the height of the phase chord to increase the cross-sectional area and cross-sectional secondary moment, and to couple the transverse reinforcement to the internal mounting hole, Sheath pipes are installed at both ends of the current chord, and the sheath pipe is installed, and concrete is filled and cured. Then, the steel is coupled to the sheath pipe and tensioned, thereby introducing a compressive section force to the axial force and the second moment. Truss structure corresponding to the secondary moment of the point portion that can effectively increase the strength and rigidity of the Using Russ structure relates to a truss bridge and methods for their construction.

In general, truss bridges are widely applied between medium and long distances from 50 to 200M, and because of their structural characteristics, each member mainly resists axial cross-sectional force. Its small cross section provides excellent wind stability and aesthetics, which is an advantage over other types of bridges.

However, when fabricating the upper and lower chords of the truss structure, the plate material is cut and welded to form a rectangular box section by welding, and welding and installing a reinforcing plate to prevent local buckling inside the box section. Not only is it difficult to manufacture due to the complicated work process, but the gusset plate that meets the upper and lower currents, and the vertical and vertical members, is vulnerable to fatigue. The situation of the truss is not available.

Furthermore, the truss structure theoretically assumes that all members are hinged at each node, so that no moment is generated in the truss member and only the axial cross-sectional force is transmitted, but most actual truss structures except for the application of ball joints at the nodes. All members connected to the silver node are rigidly connected to generate a frame moment called a secondary moment in addition to the axial cross-sectional force. In the case of truss bridge, the middle part of the span between the end point and the inner point has a slight bending stress generated in the member by the secondary moment, compared to the stress generated in the member by the axial cross-sectional force. It can be designed assuming a truss with a hinge node, but in the case of the internal point part, the bending stress generated by the secondary moment may correspond to or exceed the stress generated in the member by the axial cross-sectional force. It is a very important design section force when designing a member.

In addition, the secondary moment generated in the center truss member between the internal points increases significantly as the length of the tectonic bridge increases, making it difficult to apply the long span of the truss bridge, and to enlarge the cross section of the truss member or install the partition wall. There was a problem that results in uneconomical design.

In view of the above-described conventional defects, the object of the present invention is to improve the structural efficiency and aesthetics by applying the pipe cross section of the lower chord, the sander and the vertical member, and the upper part of the upper chord combined with the bottom plate. The open cross section of the open cross section is opened to facilitate the cutting and welding of the end of the sand material connected to the top cross section, thus improving the production efficiency of the truss structure. By placing concrete inside the phase chord before placing concrete to form the concrete, the cross section area related to the resistance ability of the axial cross section force and the secondary moment related to the resistance of the secondary moment are not only increased. Sheath pipe is installed inside the top section of the inner branch before pouring concrete to form the bottom plate The truss structure corresponding to the secondary moment of the point, which can greatly improve the tensile section force and the resistance to the secondary moment occurring in the open phase due to the dead load by tensioning high steels, and the manufacturing method and the part of the point The present invention provides a truss bridge using a truss structure corresponding to a secondary moment and a construction method thereof.

In addition, another object of the present invention is to open the cross-sectional phase current of the middle section of the section that resists the compressive section force with little influence of the secondary moment to resist the compressive section force generated by the external force by the combination of steel and concrete, 2 The open cross section chord of the inner point section with large difference of moment and tensile cross section force is composed of steel and concrete cross section before the bottom plate is placed, and the tensile cross section force generated by the dead load and external force by introducing compressive force by tension The second moment generated at the top of the open section of the inner point section is applied to the truss structure corresponding to the second moment of the point which causes the cross section second moment to be resisted by the composite section with a large increase in the cross section moment. The present invention provides a truss bridge using a corresponding truss structure and a construction method thereof.

Another object of the present invention is to combine the reinforcing bars in the mounting hole of the open cross-section current before the concrete slab is poured, and to fill the concrete, the transverse protruding from the mounting hole of the open cross-section at the bottom plate The truss structure corresponding to the secondary moment of the point of the branch part with excellent structural efficiency and excellent workability because the reinforcing bar is connected to the transverse reinforcement of the bottom plate integrally forms the chord and the bottom plate. The present invention provides a truss bridge using a truss structure corresponding to the construction method.

The truss structure corresponding to the secondary moment of the branch portion of the present invention comprises: a plurality of lower chords connected in a longitudinal direction; Sajae and fixed to the lower chord; A vertical member fixed to the lower chord; A truss structure including an open cross-section chord, the upper part of which is opened so that concrete is filled in the concrete before the concrete is placed and fixed to the sand material and the vertical material to extend to the upper edge of the bottom plate; When the truss structure is seated at each internal point between the end point and the end point of both sides, the reinforcement is improved to improve the resistance against the fixing plate and the secondary moment for steel tension on the open cross section of the inner point section. It is characterized in that it further comprises a reinforcing portion for installing the plate.

In addition, the manufacturing method of the truss structure corresponding to the secondary moment of the branch portion of the present invention,

A truss plate and a reinforcement plate are provided in the lower chord of the middle section of the trough between the end point and the inner point and the middle section of the trough between each inner point among truss structures seated at each inner point between the end points of both sides and the end point. A step of forming a lower tension part of the first tension by installing steel and coupling steel to the fixing hole of the fixing plate; Installing a support plate of the filling part in the lower chord of the inner point section, and forming a through hole in the lower chord positioned inside the support plate; Fixing a pair of vertical plates to a lower plate fixed to yarn and vertical members of the truss structure, and joining a bottom plate transverse reinforcement to a mounting hole of the vertical plate to form an open cross section current chord; Forming a reinforcing part by installing a fixing plate at both ends of the truss structure on the open end of the inner branch section, installing a reinforcing plate in the vertical plate, and coupling a sheath pipe to the fixing hole of the fixing plate; ; Placing and curing concrete in the upper end of the open section so as to form a block-out section at both sides of the reinforcing part and the reinforcing part, and firstly tensioning the steel pipe to the sheath pipe through the block-out section; Mounting and fixing a plurality of lower chords including the lower tension part and the filling part to a node support; Filling and curing concrete into the through hole of the filling part; Connecting a vertical member to the lower chord mounted on the node support; Fixing the material to the upper surface of the lower chord; It characterized in that it comprises the step of fixing the cross section open current on the vertical member and the yarn.

According to the present invention, since the upper end of the open cross-section chord is configured to facilitate the cutting and welding of the end of the sand material, it is possible to improve the production efficiency of the truss structure and to install the transverse rebar in the mounting hole of the open cross-section chord. The workability is improved because the cross section and bottom plate are integrally formed, and the tension force in the axial direction is introduced to the point top and the bottom plate to prevent lateral cracking caused by tensile cross section force occurring in the axial direction, and excellent structural efficiency. By extending the life of the bridge as well as excellent workability will have the advantage of shortening the air.

In addition, according to the present invention, the open end of the cross section of the center portion of the truss structure has a small impact of the second moment to the external current by a simple synthesis of the steel and concrete resisting the compressive section force, the second moment and the tensile cross-sectional force Since the reinforcement plate is disposed on the upper end of the open section of the large internal point section, the resistance performance of the secondary moment is improved, so that the user may have an advantage of improving the reliability of the product.

In addition, according to the present invention, by improving the load capacity for the tensile cross-sectional force generated in the phase present by tensioning the steel installed in the open cross section of the inner point section of the secondary moment and the high tensile cross-sectional force, Filling the concrete in the open phase of the cross section improves the resistance to the compressive cross-sectional force, and also has the advantage of enabling economic construction by reducing the steel by sharing the compressive cross-sectional force with the steel.

1 is an exploded perspective view of the present invention

2 is a side view of FIG.

3 is a front cross-sectional view of FIG.

Figure 4 is a side cross-sectional view of the installation state of the present invention

5 to 10 is a construction process diagram of the truss bridge using the truss structure of the present invention

11 is a member stress line diagram for the axial force of the point portion.

12 is a member stress line diagram by the point secondary moment

Explanation of symbols on the main parts of the drawings

100: truss structure 110: lower current

120: yarn 130: vertical

140: open cross section present 150: reinforcement

160: lower tension portion 170: filling portion

200: truss bridge 210,210 ': end point

220: internal point 230: first bottom plate

240: second bottom plate

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. Figure 1 is an exploded perspective view of the present invention, Figure 2 is a side configuration of Figure 1, Figure 3 is a front sectional view of Figure 1, Figure 4 is a side cross-sectional view of the installation state of the present invention.

The truss structure 100 of the present invention is provided with a plurality of lower chords 110 fixed in the longitudinal direction, and the yarn 120 is connected to the lower chord 110 is provided, the lower chord 110 It is provided with a vertical member 130 is fixed to the connection, and fixed to the sand material 120 and the vertical member 130, and extends to the upper edge of the bottom plate before the concrete pouring to form the bottom plate, the top is opened so that the concrete is filled inside The truss structure 100 includes an open cross-section chord 140 is formed, the truss structure 100 between the end points 210, 210 'and the end points 210, 210' of both sides When it is seated at each internal point 220, to improve the resistance performance to the fixing plate 151 and the second moment for the tension of the steel 152 on the open end 140 of the section of the inner point 220 section. It is configured to further include a reinforcing part 150 for installing the reinforcing plate 154 so as to, more specifically If the description follows.

The open end top chord 140 is provided with a lower plate 141 fixed to the yarn 120 and the vertical member 130, the number of a pair of vertically fixed to the lower plate 141 at regular intervals Direct plates 142 and 142 'are provided, and a plurality of mounting holes 143 penetrating inside the vertical plates 142 and 142' are provided, and transverse rebars are coupled to the respective mounting holes 143. 144 is provided.

It further comprises a connecting member 145 for connecting the transverse reinforcing bar 144 of the open cross-section chord 140, the connecting member 145 is preferably any one of the mechanical joint, the lap joint by the coupler. Do.

It is preferable to further include a mounting piece 142a protruding from the side of the pair of vertical plates 142, 142 'and the formwork is seated.

In addition, the reinforcing part 150 is provided with a fixing plate 151 which is installed on the vertical plates 142, 142 'of the upper chord 140 of the truss structure 100 opening section of the internal point 220 section. And a steel material 152 coupled to the fixing hole 151 ′ of the fixing plate 151, and provided with a sheath pipe 153 coupled to an outer circumferential surface of the steel material 152 to block contact with concrete. And a reinforcing plate 154 installed on the vertical plates 142 and 142 'to reinforce.

The reinforcing plate 154 is preferably installed to be orthogonal to the vertical plates 142 and 142 'on the vertical plates 142 and 142'.

In addition, among the truss structures 100, the truss structure 100 of the middle section of the interval between the end point 210, 210 'and the internal point 220 and the middle section of the interval between each of the internal point 220. It is provided with a fixing plate 161 which is installed in the present 110, the steel 162 is provided to be coupled to the fixing hole 161 'of the fixing plate 161, the tensile strength of the steel 162 is tensioned The lower tension portion 160 is configured to correspond to the support plate 171 is provided on the truss structure 100 lower chord 110 of each of the internal point 220 section, and the support plate 171 inside The through hole 172 is provided through the lower chord 110, the filling portion 170 to fill the concrete inside the lower chord 110 through the through hole 172 so as to correspond to the compressive cross-sectional force. It is configured to include.

In addition, the truss bridge 200 using the truss structure corresponding to the secondary moment of the branch portion of the present invention, the end points 210, 210 'and the

end points

210, 210 of both sides to support the truss structure 100 A plurality of internal points 220 are disposed between the plurality of internal points 220, and the reinforcement part 150 is installed at the upper end 140 of the open end surface of the internal point 220 in the truss structure 100. After connecting the transverse reinforcing bar 144 and the bottom plate transverse reinforcing bar 231a coupled to the mounting hole 143 of the open end upper chord 140 with the connecting member 145, the transverse reinforcing bar 231a The sheath pipe 233 is installed while the bottom plate longitudinal reinforcing bars 231b are disposed on the upper part, and the sheath pipe 233 and the bottom plate transverse and longitudinal reinforcing

bars

231a and 231b and the open cross section top current 140 After pouring and curing the concrete so that the buried), the first bottom plate 230 is configured to couple the steel 232 to the sheath pipe 233 and to tension, the truss sphere The first floor on the open cross-section chord 140 formed in the middle section between the

end points

210, 210 ′ and the interior point 220, and the middle section between the interior points 220, among the water 100. Block out section (S ') is formed on both sides of the plate 230, the bottom plate transverse reinforcing bars (241a) of the transverse reinforcing bars 144 of the open cross section top chord 140 is connected to the connecting member 145 The bottom plate longitudinal reinforcing bars 241b are disposed on the bottom plate transverse reinforcing bars 241a, and the bottom plate longitudinal and transverse reinforcing

bars

241a and 241b and the open cross-sectional top chord 140 are buried. It is configured to include a second bottom plate 240 for pouring and curing concrete.

The following describes the manufacturing process and construction process of the present invention configured as described above.

First, as shown in FIGS. 5 to 10, a plurality of internal points 220 are installed between the end points 210 and the end points 210 'of both sides to fit the length of the truss bridge 200. The truss structure 100 is mounted on the end points 210 and 210 'and the inner point 220.

The truss structure 100, the lower chord 110 is seated on the upper surface of each node supporting portion (not shown) provided at a predetermined interval to be pre-assembled in a stress-free state, the end point 210, 210 'and the internal point ( 220, the fixing plate 161 of the lower tension portion 160 is installed in the lower chord 110 of the middle section between the center section and each internal point 220, and the fixing hole of the fixing plate 161. 161 'is coupled to the steel wire or steel bar 162 to tension.

Here, since the fixing plate 161 is reinforced by a reinforcing rib (not shown), the tension force of the steel material 162 may be maintained.

In addition, a pair of support plates 171 of the filling unit 170 are installed in the lower chord 110 in the internal point 220 section, and the lower chord 110 is located between the pair of the support plates 171. The through hole 172 is formed in a pair of both ends of the filling portion 170, which is introduced into the through hole 172 of the one side, while the concrete is discharged to the through hole 172 of the other side, This is to fill the filling unit 170 inside the present 110 tightly.

Temporarily assembling the yarn 120 on the upper surface of the lower chord 110, the lower tension portion 160 and the filling section 170 is installed, and after assembling the vertical member 130 on the upper surface of the lower chord 110, the vertical material ( 130 and the open end surface chord 140, the upper portion of which is opened in the yarn 120 is formed by mounting and pre-assembled.

At this time, the open end top chord 140 is fixed to a pair of

vertical plates

142 and 142 ′ on the lower plate 141 to be spaced apart to form a 'U' shape, the vertical plate 142 A plurality of mounting holes 143 pass through 142 '.

In addition, the fixing plate 151 of the reinforcement part 150 is installed on the open end 140 on the open end surface of the internal point 220 section, and the steel 152 in the fixing hole 151 ′ of the fixing plate 151. ) Is coupled to the fixing hole 151 ′ so that both ends of the steel 152 protrude toward the end of the sheath tube 153.

After the reinforcing part 150 is coupled to the mounting holes 143 of the pair of vertical plates 142 and 142 'before and after the reinforcing section 150 is installed on the open chord 140, The reinforcement part 150 and the reinforcement part 150 to both sides of the block-out section (S) is formed so as to form the concrete to cure the interior of the open section (140), and when the concrete is cured, block out section ( Through S) the steel wire of the reinforcing part 150 or steel 152 of the steel bar is primarily tensioned.

At this time, the steel 152 may be coupled to the sheath tube 153 and tension after the concrete is cured.

The tension force of the steel 152, while the truss structure 100 is integrally connected, while limiting the compressive cross-sectional force due to the tension of the open cross-section chord 140 to be within the cross-sectional load capacity of the open cross-section chord 140 When the truss structure 100 is seated at each of the

points

210, 210 ′ and 220, it is possible to suppress the tensile cracking of the concrete filled in the upper end 140 of the open end surface of the upper portion of the internal point 220. It is preferable to adjust the level, and since the reinforcing ribs (not shown) reinforce the pair of vertical plates 142 and 142 ', the tension force of the steel 152 is transmitted to the upper chord 140 to the entire cross section. It is possible to maintain even tension throughout.

Concrete is filled into the lower chord 110 inside the pair of support plates 171 by inserting concrete into the through hole 172 on one side of the filling part 170, and the concrete filled in the lower chord 110. The concrete is filled and cured until it is discharged to the through hole 172 on the other side. When the concrete is filled into the through hole 172, the support plate 171 is reinforced by the support ribs (not shown). The truss structure 100 to support the compressive force is to be produced.

The truss structure 100 produced by the above process is seated at each internal point 220 between the end points 210, 210 'and the end points 210, 210', and the truss structure 100 is In the state seated at each of the

points

210, 210 'and 220, the filling unit 170 may be filled with concrete.

The construction of the truss bridge 200 using the truss structure 100 seated at each of the

points

210, 210 ′ and 220 is a block-out formed on the top end 140 of the open end surface of the truss structure 100. By using the section (S) to tension the steel 152 of the reinforcement part 150 second, the tension force of the steel 152, the truss structure (100) open section 140 on the side of the present chord 140, When placing the two

bottom plate

230, 240 concrete to cure, it is preferable to adjust to a level that can suppress the tensile cracking of the concrete cured in the open section 140, the upper end of the inner branch 220, When two or more steels 152 are provided in the vertical direction, they may correspond to secondary moments generated in the open cross-section chord 140 by varying the respective tension forces.

Forming the first bottom plate 230 to accommodate the reinforcing portion 150 after the steel 152 is strained by pouring concrete to the block-out section (S) of the open section 140, the open section. To install, the formwork is installed so as to be seated on the seating piece 142a protruding from the vertical plate 142, 142 'of the open end upper chord 140, the open end face current 140 in the formwork ) The transverse reinforcing bar 144 and the bottom plate transverse reinforcing bar 231a are connected to the connecting member 145.

The connection member 145 is preferably one of a mechanical joint and a double joint by a coupler.

After installing a plurality of bottom plate longitudinal reinforcing bars (231b) and sheath tube 233 on the bottom plate transverse reinforcing bars (231a), the bottom plate transverse and longitudinal reinforcing bars (231a) (231b) and sheath pipe ( 233) and the first bottom plate 230 is formed by pouring and curing concrete in the formwork so that the upper end of the open end 140 of the open end 140 is buried.

When the first bottom plate 230 is formed, between the end points 210 and 210 'and the inner point 220 and each inside to form the first bottom plate 230 and the block out section S'. Formwork forming the second bottom plate 240 in the open end surface chord 140 in the middle section of the interval between the points 220, the form, the vertical plate 142 of the open end (140) ( 142 ') is installed to be seated on the mounting piece (142a) protruding.

In the formwork, the open cross-section top chord 140 is connected to the transverse rebar 144 and the bottom plate transverse rebar 241a by the connecting member 145, and the bottom plate vertically on the bottom plate transverse rebar 241a. After placing and curing concrete in the form such that the upper end of the bottom plate transverse and longitudinal reinforcing

bars

241a and 241b and the open cross-section current column 140 are buried in a state in which the reinforcing bar 241b is placed, the formwork is removed. The second bottom plate 240 is formed while dismantling.

After the first bottom plate 230 is formed, or after the second bottom plate 240 is formed, the steel material 232 is formed as a block-out section S ′ between the first and second bottom plates 230 and 240. ) Is inserted into the sheath pipe 233 and the truss bridge 200 is completed while placing and curing concrete in the block-out section S 'in a state in which the steel 232 is tense.

Truss bridge 200 completed as described above, by installing the reinforcing plate 154 in the section where the tensile cross-sectional force and the second moment is generated on the open cross-section chord 140, the axial force of the point portion shown in FIG. As shown in Fig. 12, the compressive portion of the open cross-section chord 140 is filled with concrete to improve the load-bearing force for tensile cross-sectional force as shown in the member stress plot for FIG. Because of its excellent resistance to compressive sectional force, the resistance to secondary moments can be improved to ensure safe and extended bridge life.

As described above, the present invention, although described by the limited embodiments and drawings, terms or words used in the present specification and claims are not limited to the ordinary or dictionary meanings and should not be interpreted, the technical spirit of the present invention It must be interpreted to mean meanings and concepts. Therefore, the configuration shown in the embodiments and drawings described herein are only one embodiment of the present invention, and do not represent all of the technical spirit of the present invention, various changes within the scope of the claims of the present invention It should be understood that there may be equivalents and variations.

Claims

A plurality of lower chords fixed in the longitudinal direction;

Sajae and fixed to the lower chord;

A vertical member fixed to the lower chord;

A truss structure including an open cross-section chord, the upper part of which is opened so that concrete is filled in the concrete before the concrete is placed and fixed to the sand material and the vertical material to extend to the upper edge of the bottom plate;

When the truss structure is seated at each internal point between the end point and the end point of both sides, the reinforcement is improved to improve the resistance against the fixing plate and the secondary moment for steel tension on the open cross section of the inner point section. Truss structure corresponding to the secondary moment of the point portion, characterized in that it further comprises a reinforcement for installing the plate.
The method according to claim 1, wherein the open cross-section chord,

A lower plate connected and fixed to the sand material and the vertical material;

A pair of vertical plates fixed vertically to the lower plate at regular intervals;

A plurality of mounting holes penetrating inside the vertical plate;

Truss structure corresponding to the secondary moment of the point portion, characterized in that it comprises a transverse reinforcing bar coupled to each mounting hole.
The method according to claim 2,

A truss structure corresponding to the secondary moment of the point portion, characterized in that it further comprises a connecting member for connecting the transverse reinforcement of the open cross-section current, wherein the connecting member is any one of a mechanical joint, a lap joint by a coupler.
The method according to claim 2,

The truss structure corresponding to the secondary moment of the point portion, characterized in that it further comprises a seating piece protruding to the side of the pair of vertical plate seating the formwork.
The method according to claim 1, The reinforcement portion,

A fixing plate installed on a vertical plate on a truss structure open end surface of the inner point section;

A steel material coupled to the fixing hole of the fixing plate;

Sheath pipe coupled to the outer peripheral surface of the steel to block contact with the concrete;

Truss structure corresponding to the secondary moment of the point portion, characterized in that it comprises a reinforcement plate installed on the vertical plate to reinforce.
The method according to claim 5,

The reinforcement plate, the truss structure corresponding to the secondary moment of the point portion, characterized in that installed on the vertical plate perpendicular to the vertical plate.
The method according to claim 1,

Among the truss structures, there is provided a fixing plate installed in the truss structure lower chord of the middle section between the end point and the inner point and the middle section between the inner point, the steel is coupled to the fixing hole of the fixing plate, A lower tension part for tensioning the steel to correspond to a tensile section force;

The support plate is provided in the lower chord of the truss structure of each of the inner point section, the through hole is provided through the lower chord inside the support plate, the concrete is filled in the lower chord through the through hole to correspond to the compressive cross-sectional force Truss structure corresponding to the secondary moment of the point portion, characterized in that it further comprises a filling portion.
In the truss structure seated at each internal point between the end points of both sides and the end point, the fixing plate, the reinforcement plate and the reinforcing rib at the lower chord of the middle part section between the end point and the internal point and the middle part section between each internal point. Installing a, and forming a lower tension portion of the first tension by combining the steel in the fixing hole of the fixing plate;

Installing a support plate of the filling part in the lower chord of the inner point section, and forming a through hole in the lower chord positioned inside the support plate;

Fixing a pair of vertical plates to a lower plate fixed to yarn and vertical members of the truss structure, and joining a bottom plate transverse reinforcement to a mounting hole of the vertical plate to form an open cross section current chord;

Forming a reinforcing part by installing a fixing plate at both ends of the truss structure on the open end of the inner branch section, installing a reinforcing plate in the vertical plate, and coupling a sheath pipe to the fixing hole of the fixing plate; ;

Placing and curing concrete in the upper end of the open section so as to form a block-out section at both sides of the reinforcing part and the reinforcing part, and firstly tensioning the steel pipe to the sheath pipe through the block-out section;

Mounting and fixing a plurality of lower chords including the lower tension part and the filling part to a node support;

Filling and curing concrete into the through hole of the filling part;

Connecting a vertical member to the lower chord mounted on the node support;

Fixing the material to the upper surface of the lower chord;

And fixing the open cross-section chords on the vertical member and the yarn, wherein the truss structure corresponding to the secondary moment of the point portion is formed.
The method according to claim 8,

The reinforcement plate, the manufacturing method of the truss structure corresponding to the secondary moment of the point portion, characterized in that installed on the vertical plate perpendicular to the vertical plate.
A plurality of internal points located between end points on both sides and the end points to support the truss structure composed of any one of claims 1 to 7;

Among the truss structures, a reinforcing plate is installed on the open end of the inner section of the truss structure, the transverse reinforcing bar coupled to the mounting hole of the open end of the cross section is connected to the bottom plate transverse reinforcing bar by a connecting member, and the bottom Sheath pipe is installed while reinforcing the bottom plate longitudinal reinforcement on the upper plate reinforcing bar, and after placing and curing the concrete so that the sheath pipe and the bottom plate transverse and longitudinal reinforcement and the open cross section are buried, A first bottom plate for joining and tensioning steel materials;

In the truss structure, block out sections are formed on both sides of the first bottom plate between the end points and the respective inner points, and the bottom plate transverse bars are connected to the transverse bars of the open sections. And a second bottom plate for placing and curing the concrete so that the bottom plate transverse reinforcement is placed on top of the bottom plate transverse reinforcing bar, and the concrete is buried in the bottom plate transverse and longitudinal reinforcing bars and the open cross section. Truss bridge using a truss structure corresponding to the secondary moment of the point portion characterized in that.
Seating at each interior point between the end points on both sides and the end points to support the truss structure of any one of claims 1 to 7;

Installing a formwork to form a first bottom plate to receive a reinforcing portion of the inner point section and to be caught by a seating piece on an open end surface;

The transverse rebar of the open end face and the transverse reinforcement of the bottom plate are connected to the inside of the formwork installed to form the first bottom plate by a connecting member, and the bottom plate longitudinal reinforcement and the sheath pipe are mounted on the bottom plate transverse rebar. Installing;

Forming a first bottom plate by pouring and curing concrete in the formwork such that the bottom plate transverse and longitudinal reinforcing bars, the sheath pipe, and the open cross-section chord are buried;

Installing a mold to form a second bottom plate on the seating piece on the present section so that a block-out section is formed on both sides of the first bottom plate in the axial direction;

Connecting the transverse reinforcement of the open cross section and the transverse reinforcement of the bottom plate to the inside of the formwork installed to form the second bottom plate with a connecting member, and installing the bottom plate longitudinal reinforcement on the top of the bottom plate transverse rebar; Wow;

Placing and curing concrete in the formwork so as to bury the bottom plate transverse and longitudinal rebars and the open cross-section chord to form a second bottom plate;

The truss structure corresponding to the secondary moment of the point portion, characterized in that it comprises the step of placing and curing the concrete in the block out section after the steel is coupled to the sheath pipe of the first bottom plate through the block out section. Construction method of truss bridge using