KR101937838B1 - Prestress introduction structure of truss girder and prestress introduction method - Google Patents

Abstract

Provided is a prestress introduction structure of a truss girder provided with a prestress bonding portion introducing prestress into at least one of lower chords of a positive moment portion and upper chords of a negative moment portion in the continuous truss girder including the upper chords, the lower chords, and diagonal members formed as square steel pipes. The present invention includes a partition wall coupled to the inside of each of the square steel pipes on both sides of the prestress bonding portion; a cross-shaped point stiffener coupled to each outside of the partition wall and coupled to the inside of the square steel pipe; and a connecting bonding steel plate, a bolt, and a nut interconnecting and inter-coupling the upper and lower flanges and both web portions of the square steel pipes on both sides of the prestress bonding portion. A work hole is formed for internal and external communication between at least one of the upper flange and both web portions of the square steel pipes on both sides of the prestress bonding portion and the connecting bonding steel plate coupled thereto. A loading device is installed inside the prestress bonding portion, a load is applied in both directions, and the bolt and the nut are completely fastened. Then, the loading device is withdrawn from the prestress introduction structure of a truss girder. It is possible to significantly increase the tensile resistance of the upper and lower chords of a truss girder tensile region, and thus economical design is possible. The prestress introduction device and the introduction method based thereon are very simple, and thus work convenience is improved. Horizontal prestress introduction is possible, and thus tensile resistance can be increased more efficiently than in the case of vertical prestress introduction.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a truss girder and a prestress introduction structure,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a prestress introduction structure and a prestress introduction method of a truss girder. More particularly, the present invention relates to a technique of introducing a prestress by applying a horizontal load to an upper or lower connecting joint portion of a truss girder subjected to a tensile force.

The steel truss girder is divided into several truss girder segments, which can be transported to the vehicle, considering the transportation from the manufacturing factory to the construction site. The truss girders are transported to the construction site, , And materials are connected to each other by connecting joint steel plates and high tension bolts, or jointed by welding.

Such a steel truss girder is applied between 50 and 150m, which is a suitable bridge type between the long diameter. However, due to the characteristics of the truss girder, it is disadvantageous in economical efficiency. Therefore, there is a problem in that it can not be widely used despite being a bridging form that can be applied to aesthetically pleasing and long diameter.

In order to solve the above problems, when a prestress is introduced by a load-carrying device at the upper end of the moment section and the lower end section of the moment section of the moment section of the tensile zone in the steel truss girder bridges constituting the upper, It is possible to increase tensile resistance in the tensile region.

The method of introducing the prestress to the current and the lower current is to perform the connection before the complete joint connection at each segment connecting joint between the current and the lower current, After the flexure is generated by applying a flexural load to the steel plate, the steel plate is sandwiched between the steel plates and welded together. When the flexural load is removed, a residual moment in the reverse direction is left in the base material, thereby expanding the available stress range of the base material. .

However, in this method, the residual moment is determined by the ratio of the bending stiffness of the base material, which is the upper and lower current, and the bending stiffness (secondary moment of moment) due to the neutral axis of the slab, so the residual moment remains only about 15 to 20%. In the case of the truss girder, when the force is applied in the direction opposite to the working load, that is, in the reverse direction, since only the axial force is generated in the horizontal current, as in the finished system, And the prestressing residual stress is determined by the ratio of the cross-sectional area of the base material to the strength of the high-strength slab.

Even when the slab is used as the base material, that is, the same cross-sectional area as that of the upper or lower steel material, the efficiency of floatation is as low as 50%. Therefore, in the truss girder, when the prestress is introduced by applying the prestressing load in the direction opposite to the working load by attaching the steel plate to the tension portion of the upper or lower current, the efficiency of increasing the available stress range is low. It is not universally applicable except in special cases.

In other words, introducing a prestress by vertical prestressing load by adding a steel deck to the top and bottom of the tension zone by introducing a prestress into the truss girder is less effective due to the nature of the structural form of the truss girder, In order to increase it, a huge preloading load device and equipment are required, which is very economical. Referring to FIG. 1, in the center portion of the span of the moment section, the load (P) is removed by attaching and joining the steel plate with the load (P) in the upward direction opposite to the working load, Part can be introduced with a prestress by removing the load (P) by attaching the steel plate with the load (P) in the downward direction opposite to the working load. This method has a problem that the effect of introducing a prestress is small as described above, and a large apparatus and equipment are required.

Therefore, it is required to develop a method that maximizes the prestress efficiency while meeting the structural characteristics of the truss girder.

Patent 1: Korean Patent No. 10-1211694

In order to solve the above problems, the present invention provides a truss girder which is a segment of a truss girder, which is an upper, a lower, a lower, a lower, Providing a prestress introduction structure and a method of introducing a prestress of a truss girder which can maximize the prestress efficiency while meeting the structural characteristics of the truss girder by introducing the prestress using a horizontally loaded load device with a prestressed joint that introduces a prestress I want to.

Also, it is intended to provide a prestress introduction structure and a prestress introduction method of a truss girder which can introduce the most efficient prestress without the need of a separate large-scale prestrain load installation equipment and apparatus.

A prestress introduction structure of a truss girder according to an example of the present invention is a truss girder of a continuous truss girder including upper currents, lower currents, and workpieces formed of rectangular steel pipes, and the upper currents of the moment- 1. A prestressed introduction structure for a truss girder having a prestressed joint that introduces a prestress into at least one of the prestressed joints, the prestressed introduction structure comprising: a partition wall coupled to each of the square steel pipes at both sides of the prestressed joint; A cross-shaped point stiffener joined to the outside of each of the partition walls and coupled to the inside of the square steel pipe; And a bolt and a nut connecting the upper flange, the lower flange, and the flange of the prestressed joint double-sided square steel pipe to each other, wherein at least one of the upper flange and the upper flange of the double- A work hole is formed so as to communicate with the jointed steel plate to be joined, a load-bearing device is installed inside the prestressed joint to load the bolts and nuts in both directions, and the load- .

The loading device includes a mounting table, a hydraulic jack, and a spacer. The mounting table supports the hydraulic jack and the spacer, and includes a counterweight-shaped mounting part and a height adjusting device provided below the mounting part .

Further, the work hole may be characterized in that after the load-carrying device is taken out, it is closed by the cover steel plate.

Further, another embodiment of the prestress introduction structure of a truss girder according to an example of the present invention is characterized in that, in a continuous truss girder including upper currents, lower currents, and workpieces formed of circular steel tubes, the lower currents of the moment- A prestress introduction structure of a truss girder having a prestressed junction introducing a prestress to at least one of the plurality of phase currents in a plurality of prismatic junctions, A cross-shaped point stiffener joined to the outside of each of the partition walls and coupled to the inside of the circular steel pipe; A cross-shaped connecting and joining material joined to the inside of each of the partition walls; And a bolt and a nut for connecting the connecting joint members to each other. The load bearing device is installed inside the prestressed joint to load the bolts and the nuts in both directions. After the bolts and nuts are completely fastened, And the device is taken out.

The loading device includes a mounting table, a hydraulic jack, and a spacer. The mounting table supports the hydraulic jack and the spacer. The loading device includes a counterweight-shaped mounting part and a mounting part provided on both sides of the mounting part, And a connecting portion that is coupled to the first end portion.

Further, after the load-carrying device is pulled out, the prestressed joint portion may be sealed by an arc-shaped cover steel plate.

Further, another embodiment of the prestress introduction structure of a truss girder according to an example of the present invention is characterized in that, in a continuous truss girder including upper currents, lower currents, and workpieces formed of H-shaped steel, the lower currents of the moment- A prestress introduction structure of a truss girder having a prestress joint which introduces a prestress into at least one of the plurality of phase currents of the prestressed joint, A partition wall coupled to the partition wall; A plurality of triangular point stiffeners coupled to outer sides of the partition walls and coupled to the web of the H-shaped steel; And a bolt and a nut for connecting the flange and the web of the H-shaped steel on both sides of the prestressed joint to each other, and a load-bearing device including a hydraulic jack and a spacer is installed between both the partition walls of the pre- The load is loaded to the load-bearing device, and the bolts and nuts are fully engaged, and then the load-carrying device is taken out.

Also, the method of introducing a prestress of a truss girder according to an example of the present invention is characterized in that, in a continuous truss girder including upper currents, lower currents, and sheaths formed of rectangular steel pipes, the lower currents of the moment- A prestress introduction method for a truss girder having a prestressed joint which introduces a prestress into at least one of the prestressed joints, comprising the steps of: preparing the phase currents, A first step of joining crisscrossed point stiffeners to each of the outside of the partition and the inside of the square steel pipe and forming a work hole in at least one of the upper flange and both flanges of the double- ; The upper current flanges, the lower flange flanges, and the upper and lower flanges of the prestressed joint portions are brought in, A second step of forming a work hole in the jointed steel plate coupled with the lower flange and the welded portion by bolts and nuts, and the jointed steel plate corresponding to the work hole; A third step of installing a load-carrying device inside the prestressed joint to load the load in both directions, fully connecting the bolt and the nut, withdrawing the load-bearing device, and sealing the work hole with a cover steel plate; And a fourth step of placing the truss girder and the momentum truss girder on the upper side of the bridge and the bridge pier and interconnecting them.

Further, another embodiment of the method of introducing a prestress of a truss girder according to an example of the present invention is a method of introducing a prestress of a truss girder in a continuous truss girder including upper currents, lower currents, The present invention provides a prestress introduction method of a truss girder having a prestressed joint that introduces a prestress to at least one of the plurality of phase currents of the prestressed joints, A first step of joining a partition wall on the inside of the partition wall, connecting cross-shaped point stiffeners to each of the outside of the partition wall and the inside of the round steel pipe, and joining cross-shaped connecting and joining materials inside each of the partition walls; The upper currents, lower currents, and workpieces are brought in to separate the upper moment portion and the higher moment portion to assemble the upper moment portion truss girder and the higher moment truss girder, A second step of joining the joined joint steel plates with the bolts and nuts; A third step of installing a load-carrying device on the inside of the prestressed joint to load the load in both directions, fully connecting the bolt and the nut, withdrawing the load-bearing device, and sealing the prestressed joint with the arc- ; And a fourth step of placing the truss girder and the momentum truss girder on the upper side of the bridge and the bridge pier and interconnecting them.

Further, another embodiment of the method of introducing a prestress of a truss girder according to an example of the present invention is a method of introducing a prestress of a truss girder in a continuous truss girder including upper currents, lower currents, A method for introducing a prestress of a truss girder having a prestressed joint that introduces a prestress into at least one of the plurality of phase currents in a pre-stressed state, comprising: preparing the phase currents, And joining a plurality of triangular point stiffeners to be coupled to the outside of each of the partition walls and the web of the H-shaped portion; The upper currents, lower currents, and workpieces are taken in to separate the upper and lower parts of the truss girder and the upper part of the truss girder, respectively, and the flanges of the H- A second step of joining the jointed steel plates interconnecting the webs with bolts and nuts; A third step of installing a load bearing device including a hydraulic jack and a gap material between both partition walls of the prestressed joint to load the bolts and nuts in both directions and pulling out the load bearing device; And a fourth step of placing the truss girder and the momentum truss girder on the upper side of the bridge and the bridge pier and interconnecting them.

The present invention provides a prestressed joint which introduces a prestress to at least one of the lower ends of the moment-end portion and the upper ends of the moment-moment portion when the workpiece is assembled by bringing the workpiece, By introducing the prestress by the horizontal loading device, it is possible to maximize the efficiency of the prestress while meeting the structural characteristics of the truss girder.

In addition, it is possible to introduce the most efficient prestress without the need for a separate large-scale preloading loader and equipment.

Fig. 1 is a prior art drawing of introducing a prestress into a truss girder by loading a prefraction load in a vertical direction.
2 is a view showing a moment of a prestress introduction structure of a truss girder according to an example of the present invention and a point introducing a prestress.
3A is an exploded perspective view showing a state in which a prestressed joint according to an exemplary embodiment of the present invention is applied to a square steel pipe.
Fig. 3B is a side view of Fig. 3A. Fig.
3C-3F are cross-sectional views of FIG. 3B.
4A is an exploded perspective view showing a state in which a prestressed joint according to an exemplary embodiment of the present invention is applied to a circular steel pipe.
Fig. 4B is a plan view of Fig. 4A. Fig.
4C to 4E are cross-sectional views of FIG. 4B.
5A to 5C are a plan view, a side view, and a cross-sectional view showing a state in which a prestressed joint according to an exemplary embodiment of the present invention is applied to an H-shaped steel.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. In the drawings, like reference numerals are used to refer to like elements throughout the drawings, even if they are shown in different drawings. In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the difference that the embodiments of the present invention are not conclusive.

In describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, May be "connected "," coupled "or" connected ".

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the prestress introduction structure of the truss girder of the present invention will be described in detail.

2 to 3, a prestress introduction structure of a truss girder according to an exemplary embodiment of the present invention is characterized in that, in a continuous truss girder including upper currents, lower currents, and workpieces formed of rectangular steel pipes, And a prestressing joining portion for introducing a prestress into at least one of the upper and lower surfaces of the prestressed joint portion, wherein the prestressing joining portion includes a partition wall (22) coupled to each of the square steel pipes on both sides of the prestressed joining portion (20) ; A cross-shaped point stiffener (24) coupled to the outside of the partition (22) and coupled to the inside of the square steel pipe; A joint flange and a bolt and a nut for interconnecting the upper flange, the lower flange and the flange of the square steel pipes on both sides of the prestressed joint portion 20, and the upper flange of the square steel pipes of both sides A work hole 28 is formed so as to communicate with the inside and the outside of the connection joint steel plate 26 coupled to at least one of the front and rear waist regions 20a and 20b and the load abatement device 30 is installed inside the pre- The load is loaded in the direction of the bolts and the bolts and the nuts are completely fastened, and then the load-carrying device 30 can be taken out.

The present embodiment is applicable to a continuous truss girder 10 including upper ends 12, lower ends 14 and work pieces 16 formed of square steel pipes. The rectangular steel pipe may have a rectangular cross section as well as a square cross section. In the present embodiment, a prestress can be introduced to the bottom current 14 of the moment-end portion and / or the phase current 12 of the momentum portion in the continuous truss girder 10 such as two spans and three spans. That is, a prestressed joint portion 20 for introducing a prestress into a member subjected to a tensile force such as a lowered current 14 of the momented end portion or a phase current 12 of the momented portion is formed and a prestress is introduced into the prestressed joint portion 20 . Further, the present embodiment is also applicable to the bottom side 14 which receives the tensile force in the truss girder 10 of the simple span.

The prestressed joints 20 may be introduced into the prestressed joints 20 by a load in the horizontal direction, that is, in the axial direction, and then completely fastened to the jointed joints 26 with bolts and nuts. The prestressed joint 20 of the present embodiment can be formed at a point between the junction of the trusses and the junction.

The partition wall 22 may be coupled to each of the square steel pipes on both sides of the prestressed joint 20. The partition wall 22 is coupled to the inside of the square steel pipe, so that the cross section of the square steel pipe can be completely closed or partially closed. In addition, when completely closed, a through hole can be formed. The partition wall 22 increases the rigidity of the rectangular steel pipe and can support the load-bearing device 30 described later.

A point stiffener 24 may be coupled to the outside of the partition 22 (rear surface), that is, on the opposite side of the prestressed joint 20. The point stiffener 24 may be in the form of a cross which is coupled to the outside of the partition 22 and is coupled to the inside of the square steel pipe. The center of the cross shape is preferably located at the center of the square steel pipe. The point stiffener 24 increases the rigidity of the rectangular steel pipe and increases the supporting force of the partition 22 by joining the upper and lower flanges of the rectangular pipe with the diaphragm 22 and the diaphragm. In the square steel pipe, the point stiffener 24 may be formed in a straight shape other than the cross shape.

The present embodiment may include a bolt and a nut, and a joint joining steel plate 26 that couples the upper flange, the lower flange, and the flange of the square steel pipes of the prestressed joint 20 to each other. A plurality of bolt holes may be formed in the shape of a lattice in the upper flange, the lower flange, the abdomen of the square steel pipe, and the connecting joint steel plate 26. In other words, the connecting joint steel plates 26 are arranged on the outer side and the inner side in the four directions of the square steel pipes on both sides of the prestress joint 20, and the bolt holes formed in the square steel pipe and the bolt holes formed in the joint steel plate 26 The bolts are inserted and the nuts are fastened to join the square steel pipes on both sides of the prestressed joint portion 20. [ Any one side of the square steel pipe or the bolt hole of the connecting joint steel plate 26 may be formed as a long hole. The elongated hole can accommodate the slip occurring in the process of loading the load in the horizontal direction after the connecting joint steel plate 26 is bolted and nested, and fully engaging.

In addition, the bolt holes may be formed to be mutually aligned after a load is applied in the horizontal direction by the hydraulic jack 36, so that the bolt holes may not be formed as the long holes.

At least one of the upper flange and both flanks of the square steel pipes on both sides of the prestressed joint 20 may be formed with a work hole 28 communicating with the inside and outside. That is, the work holes 28 may be formed in the upper flanges of the square steel pipes of both sides, or the work holes 28 may be formed in the stomach of the both square steel pipes. In particular, in the case of forming on the abdomen, it may be formed on both the right and left abdomen, or may be formed on only one of the left and right abdomen. It may be desirable to form it on both the left and right abdomen in consideration of the structural balance.

The jointed steel plate 26, which is provided at a position corresponding to the work hole 28 of the square steel pipe, may be formed with a work hole 28 of the same shape. The work hole 28 can be used to install or unload a load-carrying device 30 described later. The size of the work hole 28 is desirably formed so as to be suitable for loading and unloading together with the loading and unloading of the load-carrying device 30. [

The square steel pipes on both sides are integrally joined with the joint joining steel plate 26 and the bolts and nuts and then the load bearing device 30 is installed inside the prestressed joint portion 20 to load the load in the horizontal direction and the bolts and nuts are completely fastened The load-carrying device 30 can be taken out. By applying the axial compressive force to the tension member 12 or the lower member 14 as described above, it is possible to generate the stress in the opposite direction, which occurs under the actual load action, on the entire truss girder 10. Therefore, the stress acting on the truss girder 10 at the time of actual load operation can be reduced.

The load-carrying device 30 may include a cradle 32, a hydraulic jack 36, and a spacer 38. The holder 32 supports the hydraulic jack 36 and the spacer 38 and may include a half-shaped mounting portion and a height adjusting device 34 disposed below the mounting portion. It is desirable that the mounting portion allows the hydraulic jack 36 and the spacer 38 to maintain a stable state without flowing while the load is applied. The height adjustment device 34 can be adjusted so that the hydraulic jack 36 is located at the center of the square steel pipe and at the center of the cross stiffener 24, that is, the intersection point. The spacers 38 may be used to cover the spacing between the front and rear portions of the hydraulic jack 36 and the partition 22. One or more spacers 38 may be used.

After the load-bearing device 30 is installed, the load is loaded in both directions by the hydraulic jack 36, the bolts and nuts are completely fastened, and the load-bearing device 30 is taken out through the work hole 28 .

The work hole 28 can seal the cover steel plate 40 after the load-carrying device 30 is taken out. The cover steel plate 40 is joined to the outer side of the joint bonded steel plate 26 by welding or the like having a size larger than the standard of the work hole 28, And then welding can be performed.

As a result, the connecting joints of the respective segments of the truss girder 10 are connected to each other by the connecting joint steel plates 26 in the field, and the connecting joints are connected to the bulkheads 30, (12) on the tension portion of the truss girder (10) and the moment load bearing sheave (14) are installed on the horizontal load bearing device (22) and the point stiffener (24) 30, it is possible to introduce 100% of the prestress with almost no loss by joining the current 12 and the bottom 14 on each segment of the truss girder 10. In this case, the workpiece 16 is introduced with an axial force in accordance with the structure thereof, so that the axial force due to the shear force of the entire girder is attenuated and the tensile force can be introduced into the phase current 12 or the lower current 14 in the compression region. Therefore, there is no need for a separate device to apply the prestressing load and the efficiency is high, which is a very innovative introduction method of prestress.

2 and 4, a prestress introduction structure of a truss girder according to another exemplary embodiment of the present invention is characterized in that, in a continuous truss girder including upper currents, lower currents, and workpieces formed of a round steel pipe, And a prestressed joining portion for introducing a prestress into at least one of the upper and lower portions of the prestressed joint portion, wherein the prestressed joining portion includes a partition wall 22 ); A cross-shaped point stiffener (24) coupled to the outside of the partition (22) and coupled to the inside of the round steel pipe; A cross-shaped connection and bonding material 25 coupled to the inside of each of the partition walls 22; A connecting joint steel plate 26 for connecting and connecting the connecting joint members 25 and a bolt and a nut, and a load weighting device 30 is installed inside the prestressing joint portion 20 to load in both directions After the bolts and nuts are fully tightened, the load-carrying device 30 can be taken out.

The upper side 12, the lower side 14 and the workpiece 16 of the truss girder 10 of the present embodiment are different from the above-described embodiments in that they are round steel pipes. In the present embodiment, description of the same parts as those of the above-described embodiment can be omitted. The omitted parts can be applied to the above-described embodiments in analogy.

In this embodiment, the partition wall 22 can be coupled to each of the circular steel tubes on both sides of the prestressed joint 20. The partition wall 22 may be formed as a circular plate to completely seal the end face of the circular steel pipe. Further, the partition wall 22 can seal only a part of the circular tube. A through hole may be formed in the partition wall 22. The partition wall 22 increases the rigidity of the round steel pipe and can support the load-carrying device 30 described later.

The point stiffener 24 may be coupled to the outside of the partition 22, that is, the rear surface of the partition 22. The point stiffener 24 may be coupled to the partition 22 in a cross shape and may be coupled to the inside of the round steel pipe. The point stiffener 24 can increase the supporting force of the partition 22 and increase the stiffness of the circular steel pipe as described above to increase the structural rigidity of the prestressed joint portion 20. [ The point stiffener 24 may have three, five, and six flanges radially formed at the center of the cross-shaped outboard. It is preferable that the center point of the point stiffener 24, that is, the intersection of the flanges, is located at the center of the round steel pipe.

A cross-shaped connection and bonding material 25 may be respectively coupled to the inside of the partition wall 22 joined to both the round steel tubes. The connection joint material 25 may be formed in the same shape and the same material as the point stiffener 24 described above. The connecting joint material 25 is joined to the inside of the circular pipe and the partition wall 22, thereby increasing the rigidity of the circular pipe. The connecting joint members 25 on both sides can be joined to each other by the bolts and nuts with the connecting joint steel plate 26 described later. For this purpose, a plurality of bolt holes may be formed in a lattice shape in the connecting joint material 25 and the jointly bonded steel plate 26.

The joint bonded steel plates 26 may be provided on both sides of each of the cross-shaped flanges of the joint material 25. That is, a pair of joint bonded steel plates 26 may be provided on each of the flanges of the connection joint material 25 to be combined. In this case, the bolt holes of one side of the both-side connected bonded steel plates 26 and the corresponding bonded bonded steel plates 26 may be formed as long slots in the axial direction. The elongated hole can accommodate the slip occurring in the process of fastening the connecting joint material 25 to the connecting joint steel plate 26 with bolts and nuts, and fully loading the load in the horizontal direction.

The load-bearing device 30 may be installed inside the prestress joint 20. The load-carrying device 30 of the present embodiment may include a cradle 32, a hydraulic jack 36, and a spacer 38. The holder 32 supports the hydraulic jack 36 and the spacing member 38 and may be formed as a connection portion which is provided on both sides of the mounting portion and the connecting joint steel plate 26. That is, the connecting portion may be formed by extending outward from the mounting portion, and may be formed with a bolt hole that can be engaged with the horizontally connecting bonded steel plate 26. The holder 32 may be configured to support one or a plurality of the hydraulic jacks 36 and the spacers 38. The spacers 38 may be composed of more than one to provide a very large space between the hydraulic jack 36 and the connecting joint 25.

After the load-carrying device 30 is installed, the load is loaded in both directions by the hydraulic jack 36, and the load-carrying device 30 can be taken out after the combined bolts and nuts are completely fastened.

The cover steel plate 40 can be joined after the load-carrying device 30 is taken out. The cover steel plate 40 may be formed in an arc shape so as to surround the round steel pipe. That is, by joining the arc-shaped cover steel plate 40 to the outside of the round steel pipe by welding or the like, the pre-stressed joint portion 20 formed of the round steel pipe can be sealed. The cover steel plate 40 may be formed in half-width, 1/3 or the like.

As a result, by installing the load-bearing device 30 on the prestressed joint 20, and after the horizontal load is applied and completely fastened, the tensile resistance can be greatly increased by introducing the prestress at the joint portion of the truss girder 10.

2 and 5, a prestress introduction structure of a truss girder according to another exemplary embodiment of the present invention includes a continuous girder 12 having upper ends 12, lower ends 14, And a prestressed joining portion (20) for introducing a prestress into at least one of the lower currents of the moment - end portion and the upper currents of the momentum portion in the truss girder, wherein in the prestress introduction structure of the truss girder, A partition wall (22) coupled to the inside of each of the web and the respective U-shaped grooves formed by the flanges on both sides of the web; A plurality of triangular point stiffeners (24) coupled to the outer sides of the partition walls and coupled to the webs of the H-shaped steel; And a bolt and a nut for connecting the flange and the web of the H-shaped steel on both sides of the prestressed joint to each other, and a hydraulic jack 36 and a spacer 38 are interposed between both partition walls of the pre- A load-carrying device 30 is installed to load the load in both directions, and the load-carrying device can be taken out after the bolts and nuts are completely fastened.

The upper side 12, the lower side 14, and the work 16 of the truss girder 10 of the present embodiment are different from the above-described embodiment in that they are H-shaped steel. In the present embodiment, description of the same parts as those of the above-described embodiment can be omitted. The omitted parts can be applied to the above-described embodiments in analogy. The upper and lower flanges of the upper current 12, the lower current 14 and the work 16 of the truss girder 10 according to the present embodiment can be installed vertically or horizontally.

In this embodiment, the partition wall 22 can be coupled to the inside of each of the U-shaped grooves formed on both sides of the H-shaped steel forming the prestressed joint 20 and the U-shaped grooves formed on the flanges on both sides of the web. The partition wall 22 is formed of a rectangular plate and can be welded to the U-shaped groove formed by the flange on both sides of the web of the H-shaped steel. The partition wall 22 increases the rigidity of the H-shaped steel and can support the load-carrying device 30 described later. The partition wall 22 is provided on the upper side of the H-shaped steel, but it may be provided on the lower side. It is also possible to install both of the upper and lower and the load-carrying devices described later on both the upper and lower sides.

The point stiffener 24 may be coupled to the outside of the partition 22, that is, the rear surface of the partition 22. The point stiffener 24 can be joined to the web of H-shaped steel while being welded to the partition 22 in a triangular shape. The branch stiffener in the present embodiment is a triangular steel plate, and a plurality of branch stiffeners are coupled to the back surface of the partition so as to firmly support the partition. The point stiffener 24 can increase the supporting force of the partition 22 and increase the stiffness of the H-shaped steel as described above, thereby increasing the structural rigidity of the prestressed joint portion 20. [

The H-shaped steel on both sides of the prestressed joint can be joined to the jointed joint steel plate 26 by a nut under the bolt. For this purpose, a plurality of bolt holes may be formed in the form of a lattice on flanges, webs, and jointly bonded steel plates of the H-shaped steel. That is, the joint bonded steel plates 26 are disposed on the outer side and the inner side on the flange and the web of the H-shaped steel on both sides of the prestressed joint 20 and the bolt holes formed in the H-shaped steel and the bolt holes formed in the joint bonded steel plate 26 The bolts can be inserted and the nuts can be fastened to join the H-shaped beams on both sides of the prestressed joint portion 20. [ The bolt hole of the connecting joint steel plate 26 at one side of the H-shaped steel and the corresponding portion of the H-shaped steel can be formed as a long hole. The elongated hole can accommodate the slip occurring in the process of loading the load in the horizontal direction after the connecting joint steel plate 26 is bolted and nested, and fully engaging.

In addition, bolt holes may not be formed as long holes by preliminarily calculating and forming the bolt holes after mutually aligning the bolt holes after applying the load in the horizontal direction to the hydraulic jack 36.

The load-bearing device 30 may be installed inside the prestress joint 20. The load-carrying device 30 of this embodiment may include a hydraulic jack 36 and a spacer 38. Further, it may further comprise a member for supporting the hydraulic jack 36 and the spacer 38.

After the load-carrying device 30 is installed, the load is loaded in both directions by the hydraulic jack 36, and the load-carrying device 30 can be taken out after the combined bolts and nuts are completely fastened.

As a result, by installing the load-bearing device 30 on the prestressed joint 20, and after the horizontal load is applied and completely fastened, the tensile resistance can be greatly increased by introducing the prestress at the joint portion of the truss girder 10.

Hereinafter, a method of introducing a prestress of a truss girder of the present invention will be described in detail.

2 to 3, a method of introducing a prestress of a truss girder according to an exemplary embodiment of the present invention is a method of introducing a prestress of a truss girder in a continuous truss girder including upper currents, lower currents, And a prestress connection for introducing a prestress into at least one of the phase currents of the upper and lower parts of the first and second leg sections, Shaped stiffener 24 so as to be coupled to the outside of each of the partitions 22 and the inside of the square steel pipe, A first step of forming a work hole (28) in at least one of the upper flange and both flanks of the square steel tubes at both sides of the prestressed joint (20); The upper currents 12 and lower currents 14 and the workpieces 16 are transferred to separate the upper and lower portions of the truss girder 10 and the upper portion of the truss girder 10 And the upper flange of the square steel pipes on both sides of the prestressed joint portion 20 and the joint bonded steel plate 26 connecting the both flanks to each other are bolted and bolted to the work hole 28 A second step of forming an operation hole (28) in the jointed joint steel plate (26); The load bearing device 30 is installed inside the prestressed joint portion 20 to load the load in both directions and the bolts and nuts are fully engaged and the load holding device 30 is pulled out, A third step of sealing with a cover steel plate 40; And a fourth step of interposing the upper end portion of the truss girder 10 and the upper portion of the truss root girder 10 on the upper side of the bridge pier and interconnecting them.

The present embodiment relates to a method of introducing a prestress of a truss girder formed of the above-mentioned square steel pipe. The configuration in this embodiment can refer to the above-described embodiment. The portions not described in this embodiment can be applied to the above-described embodiments in analogy.

In the first step, a rectangular steel pipe to be used for forming the truss girder 10 is prepared, and the rectangular steel pipe for forming the prestressed joint portion 20 is also prepared do.

A partition wall 22 is coupled to each of the rectangular steel pipes on both sides of the prestressed joint 20. A cross-shaped point stiffener (24) is coupled to the outside of the partition (22) so as to be coupled to the inside of the square pipe with the partition (22). A working hole (28) is formed in at least one of the upper flange of the prestressed joint (20), the upper flange of both square steel tubes, and the sheath.

In the second step, the phase currents 12, the bottom currents 14 and the workpieces 16 prepared are transferred to separate the maximum moment portion and the maximum moment portion, and the maximum moment portion truss girder 10 and the moment weight portion truss girder 10 (10). In addition, a connection joint steel plate 26 is installed on both square steel pipes of the prestress joint 20 and bolts and nuts are fastened. A work hole 28 is formed in the joint bonded steel plate 26 provided at a position corresponding to the work hole 28 of the square steel pipe. The work hole 28 of the joint bonded steel plate 26 can be formed in advance.

In the third step, a load-bearing device 30 is installed inside the prestressed joint 20 to introduce a prestress into the truss girder 10. In this step, a cradle 32 is provided on the inner side of the prestressed joint 20 to adjust the height thereof, and the hydraulic jack 36 and the spacer 38 are installed. Thereafter, load is applied in both directions to the hydraulic jack (36), and then the bolts and nuts are completely engaged. After the bolts and the nuts are fully engaged, the load-carrying device 30 is pulled out and the work hole 28 is sealed with the cover steel plate 40.

In the fourth step, the girder construction is completed by interposing the upper end of the truss girder 10 and the momentum truss girder 10 with the prestressed prestress at the upper side of the bridge and the bridge, respectively.

2 and 4, a method of introducing a prestress of a truss girder according to another exemplary embodiment of the present invention is a method of introducing a prestress of a truss girder in a continuous truss girder including upper currents, lower currents, And a prestress connection for introducing a prestress into at least one of the phase currents of the upper and lower parts of the first and second leg sections, A cruciform point stiffener 24 is provided so as to be coupled to the outside of each of the partitions 22 and the inside of the round steel pipe, And joining a cross-shaped connecting material (25) to each inner side of the partition wall (22); The upper currents 12 and lower currents 14 and the workpieces 16 are transferred to separate the upper and lower portions of the truss girder 10 and the upper portion of the truss girder 10 A second step of joining the joint joining steel plates 26 connecting the both side joining joining members 25 of the prestress joining portion 20 with bolts and nuts; The load bearing device 30 is installed inside the prestressed joint part 20 to load the load in both directions and then the bolt and nut are fully engaged and the load bearing device 30 is pulled out, A third step of sealing the steel plate with the arc-shaped cover steel plate 40; And a fourth step of interposing the upper end portion of the truss girder 10 and the upper portion of the truss root girder 10 on the upper side of the bridge pier and interconnecting them.

The present embodiment is different from the above-described embodiment in that the upper end 12, lower end 14, workpiece 16, etc. are round steel pipes. The description of the configuration and the method similar to those of the above-described embodiments in this embodiment can be omitted. The omitted parts can be applied to the description in the above-described embodiments in analogy.

In the first step, the phase currents 12, the bottom currents 14 and the workpieces 16 are prepared. A disc-shaped partition wall 22 is coupled to the inside of each of the circular steel pipes on both sides forming the prestressed joint 20. A cross-shaped point stiffener (24) is coupled to the outside of the partition (22). A cruciform connecting material (25) is joined to each inner side of the partition (22). The connecting joint material 25 is formed so as to protrude from the outside of the round steel pipe.

In the second step, the upper currents 12, the lower currents 14 and the workpieces 16 are brought into the construction site to separate the truss girder 10 and the momentum truss girder 10 from each other, do. The both-side jointing material 25 of the prestressing joint 20 is joined to the jointing steel sheet 26 by bolts and nuts.

In the third step, a hydraulic jack 36 or the like, which is a load-carrying device 30, is installed inside the prestressed joint portion 20 to load the load in both directions, and the bolt and nut are fully engaged. Thereafter, the load-carrying device 30 is taken out and the prestressed joint part 20 is joined with the arc-shaped cover steel plate 40 to seal it.

In the fourth step, the truss girder 10 and the truss girder 10 of the momentum section are mounted alternately and above the bridge pier and interconnected.

2 and 5, a method of introducing a prestress of a truss girder according to another exemplary embodiment of the present invention is a method of introducing a prestress of a truss girder in a continuous truss girder including upper currents, lower currents, And a prestressed joint for introducing a prestress to at least one of the phase currents of the momentum portions,

And a flange formed on both sides of the web and a flange formed on both sides of the flange of the flange to couple the barrier to the inside of the flange on both sides of the web, A first step of joining a plurality of triangular point stiffeners to be joined to the web of the section steel; The upper currents, lower currents, and workpieces are taken in to separate the upper and lower parts of the truss girder and the upper part of the truss girder, respectively, and the flanges of the H- A second step of joining the jointed steel plates interconnecting the webs with bolts and nuts; A third step of installing a load bearing device including a hydraulic jack and a gap material between both partition walls of the prestressed joint to load the bolts and nuts in both directions and pulling out the load bearing device; And a fourth step of interposing the upper portion of the truss girder and the upper portion of the truss girder and the upper portion of the bridge between the upper portion and the lower portion of the truss girder.

The present embodiment is different from the above-described embodiment in that the phase current 12, the bottom current 14, the work 16, and the like are H-shaped. The description of the configuration and the method similar to those of the above-described embodiments in this embodiment can be omitted. The omitted parts can be applied to the description in the above-described embodiments in analogy.

In the first step, the phase currents 12, the bottom currents 14 and the workpieces 16 are prepared. In addition, a rectangular plate-shaped partition wall 22 is joined to the inside of the U-shaped groove formed by the webs of the H-shaped steel on both sides forming the prestressed joint 20 and the flanges on both sides of the web. A plurality of triangular point stiffeners (24) are joined to the outside of the partition (22).

In the second step, the upper currents 12, the lower currents 14 and the workpieces 16 are brought into the construction site to separate the truss girder 10 and the momentum truss girder 10 from each other, do. The flanges and webs of the H-beams on both sides of the prestressed joint (20) are joined by connecting joint plates, bolts and nuts.

In the third step, a hydraulic jack 36 or the like, which is a load-carrying device 30, is installed inside the prestressed joint portion 20 to load the load in both directions, and the bolt and nut are fully engaged. Then, the load-carrying device 30 is taken out.

In the fourth step, the truss girder 10 and the truss girder 10 of the momentum section are mounted alternately and above the bridge pier and interconnected.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments. That is, within the scope of the present invention, all the constituent elements may be constituted or operated selectively in combination with one or more. Furthermore, the terms "comprises", "comprising", or "having" described above mean that a component can be implanted unless otherwise specifically stated, But should be construed as including other elements. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted to be consistent with the contextual meanings of the related art, and are not to be construed as ideal or overly formal, unless expressly defined to the contrary.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

10: Truss girder
12: Award current
14: Lower current
16: Materials
20: Prestressed joint
22:
24: Branch stiffener
25: connecting joint material
26: Connection joint plate
28: Operation hole
30: Loading device
32: Cradle
34: Height adjuster
36: Hydraulic Jack
38:
40: Cover plate

Claims (10)

A truss girder having a prestressed joint for introducing a prestress to at least one of the lower currents of the moment-end portion and the phase currents of the momentum portion in a continuous truss girder including upper currents, lower currents, In the prestress introduction structure of the present invention,
A partition wall coupled to each of the square steel pipes at both sides of the prestressed joint;
A cross-shaped point stiffener joined to the outside of each of the partition walls and coupled to the inside of the square steel pipe;
And a bolt and a nut, wherein the upper flange, the lower flange, and the flange of the prestressed joint double-
A work hole is formed to communicate with the inside and outside of at least one of the upper flange of the double-sided rectangular steel pipe of the prestressed joint portion and the joint portion and the joint joint steel sheet joined thereto,
A load-bearing device is installed inside the prestressed joint to load the load in both directions, the bolts and nuts are completely fastened, the load-bearing device is taken out,
The load-carrying device includes a cradle, a hydraulic jack, and a spacer,
Wherein the cradle includes a counterweight-shaped mounting portion for supporting the hydraulic jack and the spacer, and a height adjusting device provided below the mounting portion.
delete The method according to claim 1,
Wherein the work hole is closed by a cover steel plate after drawing out the load-carrying device.
A truss girder having a prestressed joint which introduces a prestress to at least one of the lower currents of the moment-end portion and the phase currents of the momentum portion in the continuous-type truss girder including the phase currents, In the prestress introduction structure of the present invention,
A partition wall coupled to the inside of each of the circular steel tubes on both sides of the prestressed joint;
A cross-shaped point stiffener joined to the outside of each of the partition walls and coupled to the inside of the circular steel pipe;
A cross-shaped connecting and joining material joined to the inside of each of the partition walls;
And a bolt and a nut, wherein the bolt and the nut are connected to each other,
Wherein a load-carrying device is installed inside the prestressed joint to load the load in both directions, and the bolt and nut are completely fastened, and then the load-carrying device is taken out.
The method of claim 4,
The load-carrying device includes a cradle, a hydraulic jack, and a spacer,
Wherein the cradle includes a counterweight-shaped mounting portion for supporting the hydraulic jack and the spacing member, and a connecting portion provided on both sides of the mounting portion and coupled to the connecting joint steel plate.
The method of claim 4,
Wherein the prestressed joint is sealed by an arc-shaped cover steel plate after the load-carrying device is pulled out.
delete A truss girder having a prestressed joint for introducing a prestress to at least one of the lower currents of the moment-end portion and the phase currents of the momentum portion in a continuous truss girder including upper currents, lower currents, In the prestress introduction method,
And a cross-shaped point stiffener for joining the outer side of each of the partition walls and the inside of the rectangular steel pipe, A first step of forming a work hole in at least one of an upper flange of the double-sided steel pipe of the prestressed joint and the double sheath;
The upper current flanges, the lower flange flanges, and the upper and lower flanges of the prestressed joint portions are brought in, A second step of joining the jointed steel plates to each other by bolts and nuts, and forming a work hole in the jointed steel plate corresponding to the work holes;
A third step of installing a load-carrying device inside the prestressed joint to load the load in both directions, fully connecting the bolt and the nut, withdrawing the load-bearing device, and sealing the work hole with a cover steel plate;
And a fourth step of placing the truss girder and the momentum truss girder on the upper side of the bridge and the bridge,
The load-carrying device includes a cradle, a hydraulic jack, and a spacer,
Wherein the cradle includes a counterweight-shaped mounting portion for supporting the hydraulic jack and the spacer, and a height adjusting device provided below the mounting portion.
A truss girder having a prestressed joint which introduces a prestress to at least one of the lower currents of the moment-end portion and the phase currents of the momentum portion in the continuous-type truss girder including the phase currents, In the prestress introduction method,
The present invention relates to a method of manufacturing a steel pipe, comprising the steps of: preparing the above-mentioned upper and lower basins, lower currents and workpieces, joining a partition wall inside each of the round steel pipes on both sides of the prestressed joint, A first step of joining a cross-shaped connecting and bonding material to the inside of each of the partition walls;
The upper currents, lower currents, and workpieces are brought in to separate the upper moment portion and the higher moment portion to assemble the upper moment portion truss girder and the higher moment truss girder, A second step of joining the joined joint steel plates with the bolts and nuts;
A third step of installing a load-carrying device on the inside of the prestressed joint to load the load in both directions, fully connecting the bolt and the nut, withdrawing the load-bearing device, and sealing the prestressed joint with the arc- ;
And a fourth step of alternately connecting the truss girder and the momentum truss girder to the upper portion of the pier and connecting the truss girder and the truss girder to the prestressing girder.
delete

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