KR102219072B1 - Construction Method of Bridge Structures Using Segmented Preflex Girders and Segmented Preflex Girder - Google Patents

Abstract

The present invention relates to a method of constructing a bridge structure using a segmented pre-flex girder and a segmented pre-flex girder. The method includes the following steps of: applying a pre-flex load in a state wherein an upper flange, a web and a lower part are assembled in a longitudinal direction and continued; installing a rebar and a sheath pipe in a lower flange of the continued segmentation member, and forming a block-out part at an end of an adjacent segmentation member; placing and curing casing concrete in the lower flange to manufacture a steel composite girder; applying pre-compression stress to the casing concrete, removing the pre-flex load introduced into the steel composite girder; transporting the steel composite girder to a site by separating the girder; recontinuing the segmented steel composite girder on the site; continuing block-out parts of the continued steel composite girder by inserting a steel support block between the block-out parts; placing the steel composite girder on a bridge pier or abutment after lifting up the same; installing a sheath pipe joint member in the block-out parts of the placed steel composite girder and inserting a strand; placing and curing concrete in the block-out parts; applying post-compression stress, introducing and settling prestress into the continued casing concrete through the strand; and placing rebars in a web and a slab of the steel composite girder and placing and curing concrete in the same. Therefore, the present invention is capable of effectively coping with problems which can occur throughout steps including manufacture and installation.

Description

Construction Method of Bridge Structures Using Segmented Preflex Girders and Segmented Preflex Girder}

The present invention relates to a construction method of a bridge structure using a segmented preflex girder and a segmented preflex girder.

Patent Invention 001 forms a steel girder beam by combining a horizontal shear connector provided with a reinforcing bar through-hole at regular intervals on the top of the steel beam in the longitudinal direction, and the upper part of the connecting plate while the center of the steel girder beam is raised to a certain height. After mounting and fixing, the prestress is introduced by installing rising panels on the lower sides of both ends, and the shear connector between the upper horizontal shear connectors of the steel girder beams installed in the width direction is provided with a predetermined interval between the main reinforcement through holes A composite ramen bridge using a pre-flex beam and a horizontal shear connector to allow the upper slab reinforcement to be intersected horizontally and vertically in the reinforcing bar through-hole and the main reinforcing bar through hole, respectively, if necessary, and It is about the construction method.

The composite ramen bridge construction method of the present invention for solving the above problems is the step of installing an end connecting steel material provided with a connecting plate that maintains a flat state parallel to the ground on the upper surfaces of both wall parts forming the bridge foundation (S10) ; Step of mounting a steel girder beam formed by being integrally coupled to the steel beam by a horizontal shear connector formed at a certain height above the steel beam and having a plurality of perforated power reinforcing bar through holes at regular intervals on the upper side of the wall portions on both sides (S20 ); Fixing the steel girder beam to the ends of the wall portions on both sides with coupling screws while lifting the center of the steel girder beam to a certain height so as to gradually bend left and right from the center of the steel girder beam (S30); Inserting a separately manufactured rising panel into an inclined gap formed between the steel girder beam and the connection plate formed by lifting the steel girder beam (S40); Forming a prestressed steel girder beam by firmly fixing the steel girder beam, the rising panel, and the connection plate to each other using a coupling screw in a state in which the rising panel is inserted (S50); And a plurality of prestressed steel girder beams installed in the width direction of the bridge, and then a plurality of main reinforcing bar through holes 151 are drilled at regular intervals between horizontal shear connectors formed in the adjacent prestressed steel girder beams. It characterized in that it comprises a step (S60) of forming two or more at regular intervals in the length direction of the bridge.

Patent Invention 002 is to manufacture two pre-flex composite girders by one pre-flexion load loading, and the pre-flex composite girders, which are mounted on the upper and lower sides, have the first pre-flexion load so that there is no difference in their behavior. Is a pre-flex composite girder that loads both upper and lower steel molds, and the secondary preflexion load is loaded only on the upper steel mold, and a manufacturing method thereof. In the present invention, when manufacturing a pre-flex composite girder, by installing a loading table for a branch at a position where the upper and lower rigid types are branched, the upper and lower rigid types bear their respective weights. The stress balance is achieved by eliminating the unilateral burden of the self-weight and the pre-flexion load, and the point of each steel type does not move at the same level, reducing the inconvenience and errors of the on-site manufacturer. Can make girders. In addition, by setting the loading position of the pre-flexion load to L/4, the size of the load can be reduced, thereby reducing the construction cost according to the load loading.

Patent Invention 003 relates to a method of manufacturing a pre-flex steel girder and a steel girder manufactured thereby. By allowing the reinforcing plate installed on the steel girder to share a larger load than the steel, it is possible to minimize the stress generated in the steel girder, and After loading the working load, the stress generated in the steel girder and the reinforcing plate occurs close to the allowable load, so that the material cost can be reduced, and the load is applied at the same time at three points so that the accurate pre-flex load can be introduced. It is to provide a method of manufacturing a pre-flex steel girder and a steel girder manufactured thereby.

The present invention for achieving the above object, a steel girder fixing step of fixing one end of a pair of facing steel girders; Afterwards, a center spacer is installed so that it is interposed in the center between the facing steel girders, and a spacer is installed so that a pair of side spacers having a length shorter than the length of the center spacer are spaced apart from each other to both sides of the center spacer. step; Thereafter, a pre-flex load loading step of applying a load in a direction facing each other of the steel girder at the other end of the steel girder to which one end is fixed so that the pre-flex load is introduced into the steel girder; Afterwards, a reinforcing plate installation step of installing reinforcing plates on the upper and lower sides based on the center of the steel girder to which the pre-flex load is introduced; After that, the pre-flex load is removed so that stress is introduced into the steel girder and the reinforcing plate, and when the steel girder is constructed, the pre-flex load is installed so that the loading direction is opposite to the gravity direction, so that an additional load in the direction of gravity occurs on the girder. A method of manufacturing a pre-flex steel girder configured including; a load removal step for minimizing the stress to be minimized, and the steel girder manufactured thereby is a technical gist thereof.

Patent Invention 004 relates to a preflex composite girder bridge in which the steel upper and lower flanges are exposed to the slab and lower casing surfaces, and its construction method. A shear connector is installed on the lower surface of the steel upper flange and the upper surface of the steel upper flange is a slab. It is exposed to the surface of the concrete, and a shear connector is installed on the upper surface of the lower flange of the steel type, and the lower surface of the lower flange of the steel type is exposed to the surface of the lower casing concrete. The pre-flex composite bridge of the present invention and its construction method can lower the amount of steel or the height of the structure by about 23% compared to the conventional pre-flex composite bridge.

KR 10-1432087 B1 (Registration date August 13, 2014) KR 10-0773395 B1 (registration date October 30, 2007) KR 10-1715753 B1 (Registration date March 7, 2017) KR 10-0712618 B1 (Registration date April 23, 2007)

Conventional pre-flex composite beams are integrally manufactured, and thus, there has been a problem of increasing cost and delaying air due to the construction of manufacturing sites at each site, securing the same performance value of girders manufactured on site, and lack of reliability in manufacturing quality. . In order to solve this problem, a segmented preflex girder was developed. However, due to the problem of transportation to the site due to factory manufacturing, long-term site loading due to delay in air, etc. There has been a problem in that the continuity of the stress of the girder is disconnected, and tension cracks occur in the casing concrete under the segmented girder due to the bending deformation that occurs during lifting for mounting after field connection. The present invention provides a method of constructing a segmented preflex girder that minimizes stress changes occurring during on-site transportation and installation steps by manufacturing a segmented preflexion girder in a factory.

The present invention relates to a method for constructing a bridge structure using a segmented pre-flex girder, comprising the steps of: manufacturing an H-shaped steel material formed of an upper flange, an abdomen, and a lower flange as a segmented member; Applying a pre-flexion load in a state in which the segmental members are assembled in a lengthwise direction to make them continuous; And forming a block-out portion by providing a reinforcing bar and a sheath tube on a lower flange of the segmented member and placing a temporary block at an end of the adjacent segmental member. And producing a steel composite girder by pouring and curing casing concrete on the lower flange. And applying a linear compressive stress to the casing concrete by removing the pre-flexion load introduced into the steel composite girder. And removing the garbloc, separating the steel composite girder, and transporting it to the site. And re-sequencing the segmented steel composite girder in situ. And inserting a steel support block and a sheath pipe joint member between the block-out portions of the steel composite girder and inserting a stranded wire into the connected sheath pipe in the re-continuous step, wherein the block-out portion is continuous, and the re-continuous steel Lifting the composite girder and then mounting it on a pier or abutment; And installing a sheath pipe joint member and inserting a stranded wire into the block-out portion of the mounted steel composite girder. And pouring concrete into the block-out portion and curing it. And applying a compressive stress after introducing and fixing prestress to the continuous casing concrete as a stranded wire. And pouring and curing reinforced reinforcement and concrete on the abdomen and slab of the steel composite girder.

The present invention relates to a method for constructing a bridge structure using a segmented pre-flex girder, the step of forming the block-out; in the reinforcing bar and the sheath pipe are formed in a segmented member unit.

The present invention relates to a method for constructing a bridge structure using a segmented pre-flex girder, wherein the block-out portion of the casing concrete formed between adjacent segmental members in the step of forming the block-out portion is in the form of an opening in the upper and lower gangways. Includes that.

The present invention relates to a method of constructing a bridge structure using a segmented pre-flex girder, comprising: inserting a steel support block between the block-out portions of the re-continuous steel composite girder to make the block-out portion continuous; The negative steel support block includes those provided to be permanently embedded.

The present invention relates to a method of constructing a bridge structure using a segmented pre-flex girder, comprising: inserting a steel support block between the block-out portions of the re-continuous steel composite girder to make the block-out portion continuous; The steel support block inserted into the part includes those formed in the shape of a wedge of upper gwang-hahyeop.

The present invention relates to a method for constructing a bridge structure using a segmented pre-flex girder, comprising: connecting a sheath pipe and inserting a stranded wire into the block-out portion of the mounted steel composite girder; in the sheath pipe joint member; It includes continuing the sheath tube of the outer part.

The present invention relates to a method for constructing a bridge structure using a segmented pre-flex girder, wherein the sheath pipe joint member includes a bellows shape that can be expanded and contracted.

The present invention relates to a method of constructing a bridge structure using a segmented preflex girder, wherein the sheath pipe joint member is extended from the block-out portion of the steel composite girder and inserted into the sheath pipe embedded in the casing concrete at both ends. Includes being serialized.

The present invention relates to a segmented preflex girder according to a segmented preflex girder construction method, comprising: a plurality of segment members including an upper flange, a abdomen, and a lower flange; and the plurality of segment members are mutually continuous with neighboring segment members. A reinforcing bar embedded in the casing concrete to be connected and coupled to be connected to, forming a blockout at the end of the lower flange, and disposed on the lower flange of the segmented members coupled to each other and divided into segments to be poured into the lower flange; And a sheath tube; and a steel support block provided between the block-outs; And a sheath pipe joint member; and a steel strand penetrating through the sheath pipe and fixed to an end fixing portion of the casing concrete; a segmented pre-flex steel composite girder formed of.

The present invention relates to a method of constructing a bridge structure using a segmented pre-flex girder, and using a block-out part and a steel support block formed on the segmented part, transport problems to the site due to factory manufacturing, due to air delay. Problems in which the rising value decreases due to changes in the pre-flexion load value due to long-term on-site placement, and the problem of disconnection of the stress continuity at the segment location, and tension cracks in the casing concrete under the segment girder when lifting for mounting after site connection By solving the problem, it is possible to effectively cope with the problems that may occur from manufacturing to installation stages of the steel composite girder, such as stress and rising changes.

Figure 1 (a) is a side view of the segmental member of the present invention.
Figure 1 (b) is a side view showing the deformation according to the loading force of the segmented pre-flex girder of the present invention.
Figure 1 (C) is a side view showing the split after load removal of the segmented pre-flex girder of the present invention.
Figure 2 (a) is a side view showing the insertion of the sheath tube joint member in the block-out portion of the segmented pre-flex girder of the present invention.
Figure 2(b) is a cross-sectional view of the segmented preflex girder of the present invention and a cross-sectional view of the girder formation.
3 is a conceptual diagram of inserting a steel support block into the segmented pre-flex girder of the present invention.
Figure 4 is a conceptual view of lifting and pier mounting of the segmented pre-flex girder of the present invention.
Figure 5 is a tension member tension and pouring of the segmented pre-flex girder of the present invention, a conceptual diagram of continuity.
6 is a conceptual diagram of a bridge structure completion using the segmented pre-flex girder of the present invention.

A detailed description of the construction method of a bridge structure using the segmented pre-flex girder of the present invention is as follows. Hereinafter, in order to describe in detail enough to allow those of ordinary skill in the art to easily implement the present invention, a preferred embodiment of the present invention will be described in detail. In addition, the numbers cited in the following embodiments are not limited to the cited object, and can be applied to all embodiments. An object that exhibits the same purpose and effect as the configuration presented in the examples corresponds to an equal substitution object. The upper concept presented in the examples includes the lower concept object that is not described.

[Example 1-1] The present invention is an invention for the construction method of a bridge structure using a segmented pre-flex girder, the upper flange 110 and the abdomen 120, H-type steel formed of the lower flange 130 Manufacturing the segmented member 100; applying a pre-flexion load in a state in which the segmental member is assembled in a lengthwise direction and continuous; And forming a block-out part 190 by providing a reinforcing bar 140 and a sheath tube 150 on a lower flange of the segmented member 100 and placing a temporary block at an end of an adjacent segmental member. ; And casting and curing the casing concrete 200 on the lower flange 130 to produce a steel composite girder 1000; And applying a linear compressive stress to the casing concrete by removing the pre-flexion load introduced into the steel composite girder. And removing the garbloc, separating the steel composite girder 1000, and transporting it to the site. And re-sequencing the segmented steel composite girder in situ. And inserting a steel support block and a sheath pipe joint member between the block-out portions of the steel composite girder and inserting a stranded wire into the connected sheath pipe in the re-continuous step, wherein the block-out portion is continuous, and the re-continuous steel After lifting the synthetic girder, mounting the bridge (2000) or the abutment (3000); And installing the sheath pipe joint member 170 and inserting the stranded wire 160 into the block-out portion 190 of the mounted steel composite girder 1000; And pouring concrete into the block-out portion and curing it. And applying a compressive stress after introducing and fixing the prestress to the continuous casing concrete 200 with the stranded wire 160; And placing and curing reinforcing bars 140 and concrete in the abdomen 120 and the slab of the steel composite girder. Includes.

In order to manufacture the segmented pre-flex girder as described above, the H-shaped steel formed of the normal upper flange 110, the abdomen 120, and the lower flange 130 is segmented into a size that can be transported in consideration of the length of the girder. Make it. The plurality of segmental members 100 are manufactured in a linearly curved state according to the specification of the steel material and the degree of introduction of the required pre-flexion load. The manufactured segmental member 100 is assembled in order to serialize the segmental member in the longitudinal direction for introducing a pre-flexion load and placing casing concrete. The assembly of the segmental member 100 is generally connected by forming a connecting member such as a backing plate by forming one or more through holes in the region of the abdomen 120 and/or the upper flange 110 on one side of the adjacent segmental member. . If necessary, the connection between the segmental members 100 may be integrated by tack welding or finishing by welding. In consideration of the length of the girder (L), the continuous segmental member 100 is deformed by loading through a load applied at one or more points. A reinforcing bar 140 and a sheath tube 150 for pre-stressing after concrete pouring and subsequent installation are provided in the lower flange region of the segment member 100 that is continuous after the load is applied, and connected between a plurality of adjacent segment members The block-out part 190 is formed by placing a temporary block at the end. The block-out part corresponds to an area that becomes the boundary surface when the steel composite girder 1000, which has been manufactured in the future, is separated, and is finally finished as being continuous when installing the girder in the future. Steel composite girder is completed by pouring casing concrete 200 on the lower flange 130 of the continuous segmental member 100 forming the reinforcing bar 140 and the sheath tube 150 and the block-out part 190, and When the pre-flexion load introduced into the composite girder 1000 is removed, a line compressive stress is introduced into the casing concrete area of the lower flange 130. At this time, the steel-composite girder is separated by removing the temporary block supported by the block-out part where the compression region is cut off and removing the connecting member. After that, the completed steel composite girder is transported to the site and re-continued through the combination of the segmented steel composite girder (1000). At this time, the step of continuing the block-out portion by inserting a steel support block and a sheath pipe joint member between the block-out portions of the steel composite girder and inserting a stranded wire into the connected sheath pipe in the block-out portion 190 of the re-continuous steel composite girder. It is finished. Thereafter, the steel composite girder 1000 is lifted with the steel support block 180 inserted thereinto, thereby minimizing the tensile crack generated in the casing concrete 200 during lifting and mounting it on the pier or abutment 3000. The stranded wire 160 is inserted into a shape penetrating through the sheath pipe 150 and the sheath pipe joint member 170 of the mounted steel composite girder. The connection of the stranded wire 160 and the sheath pipe 150 to the joint member to the block-out part may be lifted after being carried out in the field before lifting, or may be installed after being mounted on the pier separately from the steel support block. have. Subsequently, concrete is poured into the block-out part 190, and the lower casing concrete is continued by curing, and the prestress is introduced into the buried stranded strand 160, and then a compressive stress is applied, thereby finally completing the girder structure. After that, the upper flange 120 and the upper flange exposed with steel are covered with reinforcing bars 140 and poured concrete, forming a slab on the upper part, and paving the upper structure of the bridge.

[Example 2-1] In the construction method of a bridge structure using a segmented pre-flex girder, the step of forming the block-out; In the reinforcing bar 140 and the sheath tube 150 are formed in a segment member unit Includes that.

[Example 2-2] In the construction method of a bridge structure using a segmented pre-flex girder, the step of forming the block-out portion; in the block-out of the casing concrete 200 formed between adjacent segmental members Includes those in the form of narrow openings.

[Example 2-3] In the construction method of a bridge structure using a segmented preflex girder, the step of forming the block-out portion; Blockout of the casing concrete formed between the segmental members 100 in the connection It includes forming an opening.

When the steel composite girder 1000 is manufactured, the casing concrete 200 is formed in the lower flange 130 of the segmented member 100, and the reinforcing bar 140 is reinforced and the sheath tube 150 is inserted for pre-stressing after installation on site. And, when moving to the site after manufacture, the reinforcing bar 140 is arranged in units of the segment member 100 for separation, and the sheath tube 150 is segmented to fit the length of the segment member. In the future, the cut-out section of the block-out part 190 before mounting on the lower structure may be continued with the support block and the sheath pipe joint member 170. When forming the casing concrete on the lower flange 130, the block-out part may be manufactured by defining an end shape. This is to increase the support area on the same plane by optimally limiting the cross section for resisting deformation such as stress interruption of the concrete block-out part 190 due to tension work after transportation and lifting and bonding, and cracking caused by bending. It is limited for. Accordingly, it can be manufactured and inserted to correspond to the shape of the concrete block-out part 190 of the steel support block 180 inserted in the block-out part. In the present invention, the cross section of the block-out portion of the casing concrete 200 may be limited to various shapes, and is typically manufactured in the shape of an opening and a long-gut shape. The shape of the steel support block 180, which is inserted as a limitation in the shape of the upper and lower straits, is manufactured in a shape corresponding to this, and the area supported by being inserted into the block-out part 190 during the continuous operation of the segmented steel composite girder is existing. It is configured to be wider than the vertical section, and accordingly, it effectively responds to the change in the stress value that may occur during lifting and mounting after bonding of the steel composite girder 1000 to control the deformation of the casing concrete part, and also the tension crack problem that occurs in the concrete. It can be effectively reduced.

[Example 3-1] In the construction method of a bridge structure using a segmented pre-flex girder, the step of re-continuous; in the block-out portion of the steel support block is provided to be permanently embedded.

[Example 3-2] In the construction method of a bridge structure using a segmented pre-flex girder, the step of re-continuous; the steel support block 180 inserted into the block-out part 190 in the wedge Includes those formed into a shape.

[Example 3-3] In the construction method of a bridge structure using a segmented pre-flex girder, the re-continuous step; Including that the steel support block 180 inserted into the block-out part is formed in a long-gut shape do.

[Example 3-4] In the construction method of a bridge structure using a segmented pre-flex girder, the step of re-continuous; the steel support block inserted into the block-out part 190 supports only a part of the block-out part Includes what is provided.

[Example 3-5] In the construction method of a bridge structure using a segmented pre-flex girder, the step of re-continuous; the steel support block inserted into the block-out part 190 in the turnbuckle type support Includes being.

[Example 3-6] In the construction method of a bridge structure using a segmented pre-flex girder, the step of re-continuous; the steel support block inserted in the block-out part includes a sheath tube through-hole provided. .

The re-continuous steel composite girder 1000 by transporting the segmented steel composite girder to the site is to insert the steel support block 180 between the block-out parts 190 after arriving at the site, so that the work of partially continuing the block-out part is Is completed. The steel support block resists changes in the stress value that may occur between the segmented steel composite girders after being moved to the field, serves as a resistance to bending during lifting, and after placing the steel composite girder 1000 on the lower structure The block-out part 190 is permanently embedded in the girder structure by pouring the casing concrete 200. The steel support block 180 inserted into the block-out part may be provided in various ways according to the limitation of the shape of the concrete, and it is effective to have a support area wide based on the same plane, and the shape limit for this Representatively, it may be limited to the wedge or long-gut shape of the Sanggwanghahyeop. The steel support block may also be formed to support only a part of the block-out part 190, which connects reinforcing bars 140 formed on each of the segmented steel composite girders in addition to the permanently embedded steel support block 180 This is to facilitate the connection of the segmented sheath tube 150 and the like using a coupler. In detail, a through hole or a through slit is provided in the steel support block, or by forming a steel support block to support a surface other than the sheath pipe connection region and the connection reinforcing bar arrangement region of the block-out part, the disconnected member can be continued. In addition, the steel support block is arranged in the block-out part to compensate for changes in the gap that may occur during on-site mounting and lifting, and is manufactured in a variable shape of a turnbuckle type, and a constant torque before permanent burial due to mounting and pouring of the lower structure The (Torque) value may be checked and compensated according to the torque value change may be provided.

[Embodiment 4-1] In the construction method of a bridge structure using a segmented pre-flex girder, the step of re-continuing; in the sheath pipe joint member 170; including continuing the sheath pipe of the block-out portion with .

[Example 4-2] In the construction method of a bridge structure using a segmented pre-flex girder, the sheath pipe joint member includes a bellows shape that can be expanded and contracted.

[Example 4-3] In the construction method of a bridge structure using a segmented pre-flex girder, the sheath pipe joint member 170 is extended from the block-out portion 190 of the steel composite girder to form casing concrete at both ends. It includes being inserted into the sheath tube embedded in and continuing.

[Example 4-4] In the construction method of a bridge structure using a segmented pre-flex girder, the sheath pipe joint member was elongated from the blockout portion of the segmented girder and then mutually with the sheath pipe embedded in the casing concrete at both ends. Includes continuous threading.

[Example 4-5] In the construction method of a bridge structure using a segmented pre-flex girder, the sheath pipe joint member 170 is provided in a bellows shape, one end is formed with a forward thread, the other end is a reverse thread Includes those formed by.

A sheath pipe joint member 170 may be inserted into the block-out portion 190 of the mounted steel composite girder 1000 to connect the sheath pipe 150 embedded in a segmented steel composite girder unit. The sheath tube joint member 170 is formed to have a diameter smaller than that of the sheath tube embedded in each segmented steel composite girder 1000 and is connected by being inserted into the block-out portion of each segmented steel composite girder. Accordingly, the sheath pipe joint member 170 is provided in the form of a flexible expension pipe capable of extension and contraction, and is inserted between the block-out portions 190 in a contracted state to be embedded in the segmented steel composite girder 1000 Continuity can be ensured by expanding and inserting the sheath tube 150. In addition, the sheath pipe joint member is formed with threads at both ends, and is screwed with the embedded sheath pipe to effectively improve the coupling performance, and by inserting the sheath pipe joint member 170 into the blockout part, the embedded sheath pipe at both ends In order to fasten the thread with 150, it may be implemented that one end is formed as a forward direction and the other end is formed as a thread in the reverse direction.

[Example 5-1] In the steel composite girder according to the segmented pre-flex girder construction method, a plurality of segmented members 100 consisting of an upper flange 110 and an abdomen 120, and a lower flange 130; and The plurality of segmental members are connected and coupled to be mutually continuous with neighboring segmental members, forming a blockout at the end of the lower flange, and being disposed on the lower flange of the segmental member 100 coupled to each other and divided into segmental member units. Reinforcing bars embedded in the casing concrete 200 formed by pouring into the lower flange 130; And a sheath tube 150; and a steel support block 180 provided between the block-out part 190; And a sheath pipe joint member 170; and a stranded wire 160 that penetrates through the sheath pipe and is fixed to the end fixing portion of the casing concrete 200; and a segmented pre-flex steel composite girder 1000 formed of.

100: segmental member
110: upper flange 120: abdomen
130: lower flange 140: rebar
150: sheath tube 160: stranded wire
170: sheath pipe joint member 180: steel support block
190: block-out part
200: casing concrete
1000: steel composite girder
2000: Pier
3000: shift

Claims (9)

In the construction method of a bridge structure using a segmented preflex girder,
Manufacturing an H-shaped steel material formed of the upper flange 110, the abdomen 120, and the lower flange 130 as the segment member 100;
Applying a pre-flexion load in a state in which the segmental members are assembled in a lengthwise direction to make them continuous; And
Forming a block-out part 190 by providing a reinforcing bar and a sheath tube on a lower flange of the segmented member and placing a temporary block at an end of the adjacent segmental member; And
Pouring and curing casing concrete on the lower flange to produce a steel composite girder; And
Applying a linear compressive stress to the casing concrete by removing the pre-flexion load introduced into the steel composite girder; And
Removing the garbloc, separating the steel composite girder, and transporting it to the site; And
Re-sequencing the segmented steel composite girder on site;
In the re-continuation step, inserting a steel support block and a sheath pipe joint member between the block-out portions of the steel composite girder and inserting a stranded wire into the connected sheath pipe to make the block-out portion continuous,
Lifting the re-continuous steel composite girder and mounting it on a pier or an abutment; And
Pouring concrete and curing the block-out portion; And
Applying a compressive stress after introducing and fixing a prestress to the continuous casing concrete as a stranded wire; And
Including; pouring and curing reinforcement and concrete in the abdomen and slab of the steel composite girder,
In the step of forming the block-out portion; Including that the reinforcing bar and the sheath tube is formed in a segmental member unit,
In the step of forming the block-out portion; In the block-out portion of the casing concrete formed between the adjacent segmental member includes that the opening shape of the upper and lower narrow,
In the step of re-continuous; In the block-out portion is inserted into the steel support block is formed in a wedge shape of the upper and lower narrow,
In the step of re-sequencing; in the sheath pipe joint member; including continuing the sheath pipe of the block-out portion,
The sheath pipe joint member includes a bellows shape that can be expanded and contracted,
The construction method of a bridge structure using a segmented pre-flex girder, wherein the sheath pipe joint member is extended from the block-out portion of the steel composite girder and inserted into the sheath pipe embedded in the casing concrete at both ends to be continuous.
delete delete The method of claim 1,
In the step of re-continuous; in the block-out portion of the steel support block is provided to be permanently embedded in the construction method of a bridge structure using a segmented pre-flex girder.
delete delete delete delete In the segmented preflex girder according to the construction method of the bridge structure of claim 1 or 4,
A plurality of segmental members consisting of an upper flange and a abdomen and a lower flange; and
The plurality of segmental members are connected and coupled to each other in a continuous manner with neighboring segmental members, forming a blockout at the end of the lower flange, being disposed on the lower flange of the segmental members connected to each other, and being divided into segmental members to be poured on the lower flange Reinforcing bars embedded in the formed casing concrete; And sheath tube; and
A steel support block provided between the block-outs; And a sheath pipe joint member; and a stranded wire that penetrates through the sheath pipe and is fixed to an end fixing portion of the casing concrete.

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