KR101988714B1 - Construction method of girder and prestressing appratus - Google Patents

Abstract

The present invention relates to a girder main body, in which a superstructure is mounted and a plurality of girder bodies are spaced apart in a width direction; And a cross beam connected to the adjacent girder bodies in the width direction and spaced apart from each other in a longitudinal direction of the girder body, the method comprising the steps of: a) mounting the girder main body to a fulcrum portion ; b) installing a prestress introduction device over a plurality of beams spaced longitudinally of the girder body; c) introducing the upward deformation in the longitudinal direction into the girder body by the reaction force introduced between the plurality of beams by the prestress introduction device; d) installing a bottom plate structure on the upper side of the girder body into which the upward deformation is introduced; And e) removing the prestress introduction device installed in the beam.

Description

TECHNICAL FIELD [0001] The present invention relates to a girder construction method and a prestress introduction apparatus.

The present invention relates to a method of constructing a girder into which an upward deformation is introduced and a prestress introduction apparatus.

It should be noted that the contents described in this section merely provide background information on the present invention and do not constitute the prior art.

Generally, bridges are constructed to allow a vehicle or the like to pass through a river, sea, or valley more conveniently. The bridges are constructed of a girder designed to bear a fixed load and live load acting on the bridge, and a vehicle And a bottom plate concrete formed into a plate shape so as to be able to be used.

A girder installed on a bridge is a structure placed between a bridge pier and a pier. A bottom plate structure such as a bottom plate slab is installed on the side of the girder so that vehicles, trains, and people can pass through it.

The girder should support the weight of the girder and the weight of the bottom plate structure.

1 is a conceptual view of a conventional method of installing a girder which introduces an upward deformation at the time of making a girder.

Referring to FIG. 1, (a) a girder is formed by upwardly deforming the girder in advance in consideration of the downward deformation (deflection) of the girder, (b) a load such as a bottom structure, (C) a load of a floor structure or the like installed on the upper side of the girder can be supported by the prestress introduced in advance at the time of making the girder.

In this way, it is possible to consider introducing the upward deformation at the time of manufacturing the girder. However, in order to manufacture the girder so as to have the upward deformation, a complicated manufacturing process is required. In order to introduce the upward deformation, There is a problem that a loss of steel may be additionally generated in the process.

For example, in order to fabricate a steel member having an H-shaped or I-shaped cross-section in which an upward deformation is introduced, the web member of the steel member is cut into a shape in which the longitudinal central region rather than the linear shape is curved upward, The upper flange and the lower flange must be welded to each other.

but. There is a problem in that a loss occurs in the remaining portion of the steel material cut in this process, and additional fabrication efforts are required in welding the upper flange and the lower flange to the bent web member.

In addition, when the upward deformation is introduced in advance at the time of manufacturing the girders, there is a problem that the load on the girder main body may be limited due to the difficulty in loading the plurality of girder bodies between the girder bodies due to the upward deformation introduced during transportation .

Therefore, in order to solve the problems of the prior art, it is necessary to develop a construction method of a girder which introduces upward deformation in a state of being installed on a fulcrum portion without introducing upward deformation at the time of manufacture of the girder.

The prior art of the present invention is "Korean Laid-Open Publication No. 2015-0075178 (Method of Making Prestressed Steel Girder, Applicant: Institute of Industrial Science & Technology, Foundation).

In one aspect of the present invention, there is provided a method of constructing a girder in which downward deformation of a girder can be minimized without introducing upward deformation at the time of making the girder.

The present invention provides a method of installing a girder which can introduce a prestress while effectively preventing buckling that may occur in the girder main body when a prestress introduction device is directly installed in the girder main body.

According to one aspect of the present invention, there is provided a girder main body including a girder main body to which a superstructure is mounted and a plurality of girder main bodies are spaced apart from each other in a width direction; And a cross beam connected to the adjacent girder bodies in the width direction and spaced apart from each other in a longitudinal direction of the girder body, the method comprising the steps of: a) mounting the girder main body to a fulcrum portion ; b) installing a prestress introduction device over a plurality of beams spaced longitudinally of the girder body; c) introducing the upward deformation in the longitudinal direction into the girder body by the reaction force introduced between the plurality of beams by the prestress introduction device; d) installing a bottom plate structure on the upper side of the girder body into which the upward deformation is introduced; And c) removing the prestress introduction device installed in the beam, wherein the step c) includes a step of positioning the end portion of the girder body adjacent to the prestress introduction device in a height direction position And a height direction position of a central beam connecting the central region of the adjacent girder main body, thereby introducing an upward deformation to the girder main body, and the prestress introduction device is characterized in that the end is hooked ; A pressing means for pressing the lower side of the central beam to provide a driving force for introducing an upward deformation into the girder main body; And a tension member which connects between the fixing member and the pressing means and supports a reaction force that the pressing means presses the central beam in a state where the end is fixed to the robo by the fixing member The method of the present invention.

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Preferably, the fixing member includes: a seating groove portion in which the tension member is installed, and the end portion of the seating groove is seated; And an attachment fixture provided at one end of the fixation member, the fixture being inserted and fixed to the end of the endoscope.

Preferably, the fastening fastener is provided with an end portion of a "C" shape so that the end can be inserted and fixed to at least one end of the upper flange or the lower flange of the robot.

Preferably, the end view is provided with a top flange, a bottom flange, and a steel member having an H-shaped or I-shaped cross section with a web member, at least the bottom flange of the end raised rope and a stiffener bonded to the web member .

Preferably, at least one end portion of the end portion of the girder body is provided with an end portion, and the end portion of the end portion of the girder body is provided with the fixing member to which the tension member is connected.

Preferably, the girder body may be provided with a steel member having an H-shaped or I-shaped cross-section which is not subjected to a prestressing or upward deformation at the time of manufacture.

In order to achieve the same object as the present invention, the present invention provides a girder structure comprising: a girder main body in which a superstructure is mounted and a plurality of which are spaced apart from each other in a width direction; And a transverse beam connecting the adjacent girder bodies in the transverse direction and spaced apart from each other in a longitudinal direction of the girder body. The prestress introducing apparatus according to claim 1, A fixing member fixedly hooked to the additional robot; A pressing means for pressing the lower side of the central beam connecting the central region of the adjacent girder main body to provide a driving force for introducing the upward deformation into the girder main body; And a tension member that connects between the fixing member and the pressing means and supports a reaction force that the pressing means presses the central beam in a state where the end is fixed to the rope by the fixing member, Thereby providing an introduction device.

According to an embodiment of the present invention as described above, since the upward deformation is introduced in the construction process without introducing the upward deformation at the time of manufacturing the girder, a complex manufacturing process of the girder is not necessary, There is an effect that no loss occurs.

According to an embodiment of the present invention, by introducing the upward deformation in the longitudinal direction to the girder body by the reaction force introduced between the plurality of beams, It is possible to introduce a prestress while effectively preventing buckling.

1 is a conceptual view of a conventional method of installing a girder which introduces an upward deformation at the time of making a girder.
2 is a conceptual view of a method of constructing a girder according to the present invention introducing upward deformation in a state where a girder is mounted on a fulcrum portion.
3 is a view showing an embodiment of a girder to which a method of constructing a girder of the present invention is applied.
4 to 7 are views showing a method of constructing a girder according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the embodiments of the present invention can be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below. Further, the embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art. The shape and size of elements in the drawings may be exaggerated for clarity.

Hereinafter, a construction method of a girder according to an embodiment of the present invention will be described in detail with reference to the drawings.

Fig. 2 is a conceptual view of a construction method of the present invention of a girder which introduces upward deformation in a state where a girder is mounted on a fulcrum portion.

The construction process of the present invention will be briefly described below with reference to FIG.

(b) introducing the upward deformation into the girder in a state where the girder is mounted on the fulcrum, (c) inserting the girder into the fulcrum, (D) the weight of the girder is increased by the upward deformation introduced in a state where the girder is mounted on the fulcrum portion, and the weight of the girder is installed on the upper side of the girder The load of the upper structure such as the floor structure can be stably supported.

3 to 7, a method of constructing a girder according to the present invention includes a girder main body 110, which is installed longitudinally so as to receive an upper structure and a plurality of which are spaced apart from each other in a width direction, And a girder 100 having a girder 130 connected to the girder main body 110 in the width direction and spaced apart from each other in the longitudinal direction of the girder main body 110.

The method of constructing a girder according to the present invention includes the steps of: a) mounting the girder main body 110 to a fulcrum portion 20; b) forming a plurality of cross beams 130 C) installing the prestress introduction device 200 in the longitudinal direction of the girder main body 110 by the reaction force introduced between the plurality of beams 130 by the prestress introduction device 200; D) installing a bottom plate structure 300 on the upper side of the girder main body 110 into which the upward deformation is introduced; and e) installing the bottom plate structure 300 on the girder 100 of the girder 100 And removing the prestress introduction device 200.

The present invention is characterized in that the prestress introducing apparatus 200 is installed on the girder body 130 that connects between the adjacent girder main bodies 110 rather than the girder main body 110 which is a structural member in which the load of the upper structure is loaded, And has a technical feature in that it is configured to introduce a prestress.

The present invention is characterized in that the girder main body 110 is provided with an upward upward deformation in the longitudinal direction of the girder main body 110 by a reaction force introduced between a plurality of the beams 130 connecting the girder main body 110, It is possible to introduce the prestress while effectively preventing buckling that may occur in the girder main body 110 when the introduction device 200 is installed.

As shown in FIG. 3, the girder 100 to which the girder construction method of the present invention is applied may include a plurality of girder bodies 110 and a plurality of beams 130.

The girder main body 110 is a structural member in which a load of an upper structure such as a bottom plate structure is directly deposited on the upper side of the girder main body 110. The girder main body 110 connects the adjacent girder main bodies 110, It can be composed of a connecting member which is not directly loaded.

The upper structure may be mounted on the upper side of the girder body 110. In other words, a fixed load of the upper structure such as the bottom plate structure 300 and a live load such as a vehicle applied to the upper structure can be directly loaded on the girder main body 110.

The beam 130 connects the adjacent girder main bodies 110 and is a connecting member in which the load of the upper structure is not directly loaded.

The side beam 130 includes end ropes 130-1 connecting adjacent side end regions of the adjacent girder main body 110 and side girders 130-1 disposed between the end rovers 130-1, And a central beam 130-2 connecting the central region of the first and second beams 110 and 110 to each other.

The end beams 130-1 are disposed at both side end regions of the girder main body 110 and the center beam 130-2 is disposed at the end side regions of the girder main body 110, ). ≪ / RTI >

The transverse beams 130 are connected between the adjacent girder bodies 110 while the upward deformation is introduced into the girder body 110 by the prestress introduction device 200 installed on the beam 130, The web member of the girder main body 110 is supported and buckling that may occur in the direction of the axis of the girder body 110 constituted by H-shaped steel or the like can be prevented.

The girder main body 110 and the beam 130 may be formed of a steel member having an H-shaped or I-shaped cross section. At this time, an end of the beam 130 may be joined to the web member of the girder body 110.

At this time, the ends of the beam 130 may be installed in a heightwise central region of the web member of the girder body 110.

Specifically, the beam 130 is joined to the web member of the girder main body 110, and the upper flange of the beam 130 is spaced apart from the upper flange of the girder body 110 by a predetermined distance downward in the height direction The lower flange of the beam 130 may be spaced upward from the upper surface of the lower flange of the girder body 110 in the height direction.

3 and 7, the construction method of the girder of the present invention will be described in detail as follows.

a) mounting the girder body (110) to the fulcrum portion (20);

As shown in FIG. 4, in step a), the girder main body 110 can be mounted on the fulcrum portion 20. Both ends of the girder main body 110 of the girder 100 can be mounted on the fulcrum portion 20 on the upper side of the pier 30.

 b) installing a prestress introduction device (200) over a plurality of beams (130) spaced in the longitudinal direction of the girder main body (110);

5, in the step b), the prestress introduction apparatus 200 may be installed over a plurality of the beams 130 spaced apart from each other in the longitudinal direction of the girder main body 110.

More specifically, a fixing member 210 fixed to the end ropes 130-1 provided at both side end regions of the girder 100 is fixed and the lower side of the central beam 130-2 is pressed, A pressing means 230 for providing driving force for introducing an upward deformation into the girder main body 110 is disposed below the central beam 130-2 and a tension member 250 is fixed to the fixing member 210 and the pressing means 210. [ And a pressing force applied to the central beam 130-2 by the pressing means 230 in a state where the end is fixed to the robo 130-1 by the fixing member 210 The prestress introducing apparatus 200 can be installed.

c) introducing the upward deformation in the longitudinal direction into the girder body 110 by the reaction force introduced between the plurality of beams 130 by the prestress introduction device 200;

As shown in FIG. 6, in the step c), the upward deformation can be induced in the longitudinal direction of the girder main body 110 by the reaction force introduced between the plurality of beams 130 by the prestress introduction device 200 have.

In the method of constructing the girder according to the present invention, the step (c) may include a step in which the prestress introduction device 200 moves the height position of the end robo 130-1 connecting the end region of the adjacent girder main body 110, It is possible to relatively displace at least one of the heightwise positions of the center beam 130-2 connecting the central region of the girder body 110 to introduce the upward deformation into the girder body 110. [

The upward displacement is introduced into the girder main body 110 as the height of the central beam 130-2 and the end ropes 130-1 are displaced relative to each other by the action force introduced from the prestress introduction apparatus 200 .

Specifically, by the action force introduced from the prestress introduction device 200, the fixing member 210 is fixed to the end robo 130-1, and the pressing member 210, which is connected to the fixing member 210 via the tension member 250, In the state where the means 230 is disposed below the central beam 130-2, the lower side of the central beam 130-2 is pressed so that the position of the center beam 130-2 in the height direction and the end of the beam 130- 1 in the longitudinal direction of the girder body 110 by relatively displacing at least one of the height direction positions of the girder body 110 and the girder body 110 in the longitudinal direction.

In one example, the center beam 130-2 is relatively displaced upward and upward relative to the original position, and the end robo 130-1 can be relatively displaced upward and downward from its original position.

d) installing a bottom plate structure (300) on the upper side of the girder body (110) into which the upward deformation is introduced;

As shown in FIG. 7, in step d), the bottom plate structure 300 may be installed on the upper side of the girder body 110 into which the upward deformation is introduced.

The bottom plate structure 300 is installed on the upper side of the girder main body 110 in which the upward deformation is introduced and the girder main body 110 and the bottom plate structure 300 are integrated.

For example, the bottom plate concrete may be placed on the upper side of the girder main body 110 in which the upward deformation is introduced and hardened to integrate the girder main body 110 and the bottom plate structure 300.

As another example, a bottom plate structure 300 of precast material can be installed on the upper side of the girder body 110 into which the upward deformation is introduced.

A live load such as a vehicle or a person can be applied to the upper side of the bottom structure in a state in which the bottom plate structure 300 is provided on the upper side of the girder main body 110 and both are integrated.

e) removing the prestress introduction device (200) installed in the beam (130);

As shown in FIG. 7, in the step e), the prestress introduction apparatus 200 installed on the beam 130 can be removed.

In this manner, various constructions such as bridges in which the girders 100 of the present invention are continuously installed can be continuously installed while reducing the construction cost by recycling the removed prestress introduction apparatus 200. [

5, the prestress introduction apparatus 200 applied to the girder construction method of the present invention may include a fixing member 210, a pressing means 230, and a tension member 250. As shown in FIG.

The prestress introducing apparatus 200 includes a fixing member 210 which is fixed by hooking to an end robo 130-1 connecting adjacent end regions of the girder main body 110, A pressing means 230 for pressing the lower side of the central beam 130-2 connecting the central region to provide a driving force for introducing an upward deformation into the girder main body 110; And the pressing means 230 presses the central beam 130-2 while the end is fixed to the robot 130-1 by the fixing member 210 And a tension member 250 for supporting the reaction force.

The central beam 130-2 to which the lower surface is pressed by the pressing means 230 acts as a reaction force of the upper side and the tension member 250 fixed to the end of the rope 130-1 by the fixing member 210, Together with the fixing member 210 and the end ropple 130-1, can serve as a reaction force band on the lower side.

The upward displacement is introduced into the girder main body 110 as the height of the central beam 130-2 and the end ropes 130-1 are displaced relative to each other by the action force introduced from the prestress introduction apparatus 200 .

6, the center beam 130-2 serving as a reaction force of the upper side moves upward from its original position while the lower face is pressed by the pressing means 230, The end rope 130-1 serving as a reaction force of the lower side together with the tension member 250 can be introduced upward in the longitudinal direction to the girder main body 110 while moving downward from the original position.

Of course, since the longitudinal center region of the girder body 110 is deformed more easily than the end region, the center beam 130-2, which acts as a reaction force of the upper side, moves upward than the original position, It is a matter of course that the end robo 130-1 serving as a role can maintain its original position.

The fixing member 210 may be fixed to the end robo 130-1 provided at both side end regions of the girder main body 110. [

The fixing member 210 can be inserted and fixed to at least one of the lower flange or the upper flange of the end robo 130-1.

At this time, the fixing member 210 may be inserted in the width direction at at least one end of the lower flange or the upper flange of the beam 130.

The pressing means 230 is connected to the fixing member 210 via the tension member 250 and is disposed below the center beam 130-2 provided in the central region of the girder body 110, The upward deformation can be introduced into the girder main body 110 by the reaction force pressing the lower side of the beam 130-2.

The pressing means 230 includes a pressing jack 231 provided under the central beam 130-2 and a pressing plate 233 on which the pressing jack 231 is installed and the tension member 250 is fixed .

At this time, the pressure jack 231 may be provided as a hydraulic jack or a pneumatic jack which presses the lower side of the center beam 130-2 by a method such as hydraulic pressure or pneumatic pressure.

The tension member 250 can support the reaction force that the pressing means 230 presses the central beam 130-2 while the end is fixed to the robo 130-1 by the fixing member 210 have.

The tension member 250 can be fixed to the fixing member 210 via a turnbuckle.

At this time, when the tension member 250 is fixed to the fixing member 210 of the fixing member 210 via the turnbuckle, the distance between the pressing member 230 and the fixing member 210 may be adjusted while being adjusted .

As shown in FIG. 5, the fixing member 210 may have a seating groove 211 and a fastening fixture 213.

The fixing member 210 includes a seating groove portion 211 in which the tension member 250 is installed and the end portion on which the robo 130-1 is seated and a fixing groove portion 211 provided at one end of the fixing member 210, And a graft fixture 213 inserted and fixed to an end of the supplementary robot 130-1.

When the lower surface of the lower flange of the end robo 130-1 or the upper surface of the upper flange is seated and the tension force is applied by the tension member 250, The flange or the upper flange can be firmly fixed while coming into close contact with the seating groove 211 of the fixing member 210.

Preferably, the fixing member 210 is provided with a tension member 250. The end portion of the fixing member 210 has a seating groove 211 in which the lower flange of the robo 130-1 is seated, And a fastener (213) fixed to the end of the lower flange of the robot (130-1).

The hooking fixture 213 has an end portion formed in a C-shaped cross-section, and the end can be inserted and fixed to at least one end of the upper flange or the lower flange of the robot 130-1.

When the stepped brace 130-1 is formed of a steel member having an H-shaped or I-shaped cross section, the step of fixing the hooking fixture 213 is performed so that the end is fixedly inserted into the upper flange or the lower flange of the robot 130-1, Quot; C " -shaped cross section.

Preferably, the end portion may be formed in a 'C' -shaped shape so as to be inserted and fixed in the lower flange of the end portion of the robot 130-1.

The seating groove 211 of the fixing member 210 may be provided in a flat plate shape such that the bottom flange of the end portion of the robot 130-1 is in contact with the bottom plate.

Further, although not shown, when the stepped brace 130-1 is formed of a rectangular steel pipe, the hooking fastener 213 may have a tip end portion of a 'C' shape so as to be coupled to the rectangular steel pipe.

The end roving 130-1 is provided with a section having an H-shaped or I-shaped cross section having an upper flange, a lower flange and a web member, and at least the lower end of the ro- And a stiffener 135 joined to the web member may be formed.

The fixing member 210 is inserted and fixed in the lower flange of the end robo 130-1 and the fixing member 210 is fixed to the lower flange of the end rope 130-1 and the web member around the fixing portion. The bending moment applied to the end portion of the robot 130-1 can be stably supported by the fixing member 210 to which the tension member 250 is connected.

Needless to say, the reinforcing member 135 may be joined to the lower flange, the web member, and the upper flange.

The end rope 130-1 may have a stiffener 135 for preventing buckling of the end rope 130-1 on at least one side of the portion where the fixing member 210 is fixed.

As shown in FIG. 4, at least one of the end portions of the girder main body 110 is provided with one side end portion region 130-1,

Although not shown, the fastening member 210 to which the tension member 250 is connected may be installed on the end rope 130-1.

As shown in Figs. 3 and 4, the girder main body 110 may be formed as a steel member having an H-shaped or I-shaped cross-section which is not subjected to a prestressing or upward deformation at the time of manufacture.

In order to introduce the prestress into the girder 100, it may be considered that the girder main body 110 is manufactured by introducing the upward deformation at the time of manufacture. However, in order to manufacture the girder 100 with upward deformation, There is a problem that a loss of the steel material may be additionally generated in the process of cutting the steel material into a warped shape in order to introduce the upward deformation.

For example, in order to fabricate a steel member having an H-shaped or I-shaped cross-section in which an upward deformation is introduced, the web member of the steel member is cut into a shape in which the longitudinal central region rather than the linear shape is curved upward, The upper flange and the lower flange must be welded to each other.

but. There is a problem in that a loss occurs in the remaining portion of the steel material cut in this process, and additional fabrication efforts are required in welding the upper flange and the lower flange to the bent web member.

When the upward deformation is introduced in advance to the girder main body 110, it becomes difficult to load the plurality of girder main bodies 110 between the girder main bodies 110 due to the upward deformation introduced during transportation, 110) is limited, transportation cost may increase.

In the case of the girder 100 to which the present invention is applied, since the girder main body 110 is provided in a linear shape with no upward deformation at the time of manufacture, the loading of the girder main body 110 and the like becomes easy, 110) can be easily transported to a single field.

The construction method of the girder of the present invention is exemplified as a preferable construction method in order to allow a person having ordinary skill in the art to easily carry out the present invention. In addition to the above-mentioned procedure, It is to be understood that modifications may be made in the sequence, or other ancillary processes may be added.

Next, the prestress introduction apparatus 200 will be described in detail with reference to FIGS. 5 to 7. FIG.

The prestress introduction apparatus 200 according to an embodiment of the present invention may include a fixing member 210, a pressing member 230, and a tension member 250.

The prestress introducing apparatus 200 according to the present invention includes a girder main body 110 which is installed in a longitudinal direction so as to receive an upper structure and a plurality of which are spaced apart from each other in the width direction and a girder main body 110 which connects adjacent girder main bodies 110 in the width direction, The present invention can be applied to a girder 100 having a beam 130 spaced apart from each other in the longitudinal direction of the main body 110.

5, the prestress introduction apparatus 200 according to the present invention includes a fixing member 210 which is fixed by hooking an end portion of the adjacent girder main body 110 to a robo 130-1, A pressing means 230 for pressing the lower side of the central beam 130-2 connecting the central region of the adjacent girder main body 110 to provide a driving force for introducing an upward deformation into the girder main body 110, The pressing member 230 is connected to the fixing member 210 and the pressing member 230 while the fixing member 210 is fixed to the end member by the fixing member 210, And a tension member 250 for supporting a reaction force pressing the central beam 130-2.

The prestress introducing apparatus 200 includes a prestress introducing apparatus 200 for guiding the position of the end of the girder main body 110 in the height direction of the girder 130-1 and the center girder connecting the center region of the adjacent girder main body 110 130-2 may be displaced relative to each other to introduce an upward deformation into the girder main body 110. [

It is needless to say that various embodiments of the prestress introduction apparatus 200 applied to the construction method of the girder described above can be applied to the prestress introduction apparatus 200 of the present invention.

Therefore, the structure of the fixing member 210, the pressurizing unit 230, and the tension member 250 of the prestress introduction apparatus 200 used in the girder construction method is the same as that of the prestress introduction apparatus 200 A detailed description of the bar is omitted in order to avoid redundancy.

Although the embodiments of the present invention have been described in detail, it is to be understood that the scope of the present invention is not limited to the above embodiments and various changes and modifications may be made without departing from the scope of the present invention. It will be obvious to those of ordinary skill in the art.

10: girder 20:
30: Pier
100: girder 110: girder body
130: crossbar 130-1:
130-2: central beam 135: stiffener
200: Prestress introduction device
210: fixing member 211: seating groove
213: Gripping fixture 230: Pressurizing means
231: pressure jack 233: pressure plate
250: strain member 300: bottom plate structure

Claims (9)

delete delete A girder main body in which a superstructure is mounted and a plurality of girder main bodies are spaced apart in a width direction; And a cross beam connecting the adjacent girder bodies in the width direction and spaced apart from each other in the longitudinal direction of the girder body.
a) mounting the girder main body to a fulcrum portion;
b) installing a prestress introduction device over a plurality of beams spaced longitudinally of the girder body;
c) introducing the upward deformation in the longitudinal direction into the girder body by the reaction force introduced between the plurality of beams by the prestress introduction device;
d) installing a bottom plate structure on the upper side of the girder body into which the upward deformation is introduced; And
e) removing the prestress introduction device installed in the beam,
The step c)
The prestress introduction device relatively displaces at least one of a position in a height direction of an end rope connecting an end region of the adjacent girder main body and a position in a height direction of a center cross beam connecting the central region of the adjacent girder main body, Introducing upward deformation into the body,
In the above-described prestress introduction device,
A fixing member to which the end is hooked to the robot;
A pressing means for pressing the lower side of the central beam to provide a driving force for introducing an upward deformation into the girder main body; And
And a tension member which connects between the fixing member and the pressing means and supports the reaction force that the pressing means presses the central beam in a state where the end is fixed to the robo by the fixing member Way.
The apparatus according to claim 3,
A seating groove portion in which the tension member is installed and the end portion of the rope is seated; And
And a fixing unit provided at one end of the fixing member and having the end inserted and fixed to an end of the robo.
[5] The apparatus of claim 4,
Wherein the end portion is formed in a section having a "C" shape, and the end portion is inserted and fixed to at least one end portion of the upper flange or the lower flange of the robo.
4. The method of claim 3,
An upper flange, a lower flange, and a H-shaped or I-shaped cross section having a web member,
Wherein at least a lower flange of the end rope and a stiffener joined to the web member are formed.
The method of claim 3,
At least two or more of said end ropes are provided in one end region of said girder main body,
And the fixing member to which the tension member is connected is installed on the end robo.
The method of claim 3,
Wherein the girder body is formed of a steel member having an H-shaped or I-shaped cross-section having no prestress or upward deformation introduced at the time of manufacture.
A girder main body in which a superstructure is mounted and a plurality of girder main bodies are spaced apart in a width direction; And a transverse beam connecting the adjacent girder bodies in the width direction and spaced apart from each other in the longitudinal direction of the girder body;
A fixing member to which the end connecting the end regions of the adjacent girder main bodies is fixed by hooking to the ropes;
A pressing means for pressing the lower side of the central beam connecting the central region of the adjacent girder main body to provide a driving force for introducing the upward deformation into the girder main body; And
And a tension member which connects between the fixing member and the pressing means and supports a reaction force that the pressing means presses the central beam in a state where the end is fixed to the robo by the fixing member, .

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