KR102374011B1 - Bridge with reduced negative moment at the support - Google Patents

Abstract

The present invention provides a bridge including a lower structure (2) and an upper structure provided on the upper portion of the lower structure (2), wherein the upper structure includes a main girder (1) and a support structure (100) installed on the upper side of the lower structure (2) and integrally connected to the main girder (1).

Description

Bridge with reduced negative moment at the support}

The present invention relates to a bridge capable of reducing the deflection of the bridge girder and reducing the negative moment generated in the branch. More specifically, it is possible to reduce the deflection by obtaining the effect of shortening the span by the structure of the coping part supporting the branch girder, and to reduce the negative moment of the branch part by introducing the prestress in the vertical direction to the branch part structure. It is related to a bridge with reduced negative moment in the branch.

A bridge is a civil structure that connects space and space and provides a passage for people, vehicles, trains, water resources, and cargo to move. Bridges are completed by installing superstructures (girders, deck plates, slabs, etc.) on substructures such as abutments and piers. should be considered.

When designing and constructing a bridge, the amount of deflection of the girder should be within the standard value (in some cases, soaring is applied), and it should be able to support the negative moment that occurs in the girder at the branch point, and the straight hair generated in the girder between spans. It should be sufficient to support the statement.

To this end, conventionally, a large number of substructures (piers) are installed to shorten the span (the amount of deflection of the girder is proportional to the fourth power of the span length, so shortening the length of the span can reduce the amount of deflection), the cross section of the girder The method of increasing the size of the girders or changing the shape of the girder according to the distribution of the moment was used.

However, the conventional bridge structure, moment, and deflection reduction methods as described above did not economically and efficiently utilize the bridge structure, and since they are simply methods of using a large number of members or making them larger, there is a problem in that the construction cost and construction period increase.

Therefore, it was necessary to develop a bridge structure that can reduce the deflection of the girder and the negative moment of the branch part at a low cost through an efficient structure while making the design and construction of the bridge easy with a simple structure.

Registered Patent Publication No. 10-2227674

In order to improve the problems of the prior art as described above, in the present invention, the effect of shortening the span length without increasing the number of substructures (piers) is given to reduce the negative moment at the point which can significantly reduce the deflection of the girder It aims to provide a type bridge.

An object of the present invention is to provide a branch negative moment reduction bridge capable of effectively reducing the negative moment of the branch by introducing a prestress to the branch by a simple structure.

In the present invention, in the case of a multi-span bridge, the Ramen-type branch structure and the continuous branch structure are applied together according to the topography and span conditions, etc. aim to

In the present invention, in a bridge including a lower structure (2) and an upper structure provided on the upper portion of the lower structure (2), the upper structure includes: a main girder (1); It is installed on the upper portion of the lower structure (2) and provides a branch portion negative moment reduction bridge including a branch portion structure (100) integrally connected to the main girder (1).

The branch structure 100 includes a branch girder 10 and a coping part 20, the branch girder 10 is integrally connected with the main girder 1, and the coping part 20 is installed on the upper part of the substructure 2, and the branch girder 10 and the coping part 20 are provided with tension members 30 in the vertical direction at right angles to the bridge axis, so as to lower the branch girder 10. It is characterized in that it reduces the negative moment of the branch girder 10 by pressing it.

The coping portion 20 includes a first inclined member 211; a second inclined member 212; A lower member 213 is included, and a lower portion of the first inclined member 211 and a lower portion of the second inclined member 212 are rigidly coupled to the lower member 213 , and the tension member 30 is positioned at the point. It is characterized in that by being installed in the sub girder 10 and the lower member 213, the negative moment generated in the branch girder 10 is reduced.

The coping portion 20 includes a first inclined member 221; a second inclined member 222; lower member 223; and an upper member 225, wherein a lower portion of the first inclined member 221 and a lower portion of the second inclined member 222 are rigidly coupled to the lower member 223, and the upper member 225 includes the At the upper portion of the lower member 223 , it is rigidly coupled between the first inclined member 221 and the second inclined member 222 , and the tension member 30 is connected to the branch girder 10 and the upper member 225 . ) by being installed in the branch girder (10) characterized in that to reduce the negative moment generated.

The coping portion 20 includes a first horizontal member 231; a second horizontal member 232; A connecting member 233 is included, wherein the connecting member 233 is rigidly coupled between the first horizontal member 231 and the second horizontal member 232, and the tension member 30 is the fulcrum part girder ( 10) and being installed in the connecting member 233, it is characterized in that the negative moment generated in the branch girder 10 is reduced.

The branch structure 100 is characterized in that it is a ramen type in which the branch girder 10 and the coping portion 20 are rigidly coupled.

The branch structure 100 is a continuous type in which at least one of a hinge support, a roller support, and an elastic support is provided between the branch girder 10 and the coping part 20 .

The branch structure 100 includes a ramen type in which the branch girder 10 and the coping part 20 are rigidly coupled, and a hinge support between the branch girder 10 and the coping part 20, a roller It is characterized in that it includes all of the continuous type in which at least one of the support and the elastic support is provided.

The tension member 30 includes a steel bar or a stranded wire.

The branch structure 100 is manufactured in a factory, characterized in that it is integrally connected with the main girder 1 at the bridge construction site.

The branch negative moment reduction bridge of the present invention has the following effects.

First, the branch structure 100 of the present invention is an efficient structure that gives the effect of reducing the span length, a structure that can introduce vertical tension, and a structure that can be modularized, thereby reducing construction costs, shortening the period, durability of the bridge, A synergistic effect such as increased safety can be obtained.

Second, since the coping portion 20 of the branch structure 100 can support the branch girder at regular intervals, it is possible to obtain the effect of shortening the span length without increasing the number of substructures, so that the sagging of the girder can be significantly reduced.

Third, by installing the tension member 30 in the vertical direction on the branch girder 10 and the coping part 20, and introducing a pre-stress to the tension member, the negative moment (the member above the top) generated in the branch girder 10 It is possible to reduce the moment that deforms convexly toward the side, and the positive moment (moment that deforms the member convexly downward) generated in the main girder that is rigidly connected to the branch girder can also be reduced.

Fourth, by tensioning the tension member 30 installed in the vertical direction on the branch girder 10 and the coping unit 20, it is possible to give the main girder a spur.

Fifth, in the case of a multi-span bridge, the ramen-type branch structure and the continuous branch structure can be applied together depending on the topography and span conditions, so that structural efficiency and stability can be secured at the same time, and bridges of various structures can be constructed. can

Sixth, if the branch substructure 100 including the branch girder 10 and the coping part 20 is manufactured at the factory, and only the work of connecting the main girder and the branch substructure 100 is performed at the bridge construction site, Since the framing of the bridge superstructure can be completed, the amount of air is dramatically reduced.

Seventh, since the structure and shape of the coping unit 20 can be variously changed and applied, the vertical length of the tension member, the magnitude of the tension force, and the number of piers at the same point (1 pier, 2 pier, 3 pier, etc.) ) can be easily changed and applied.

Effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 is a perspective view of a bridge to which a first embodiment of the present invention is applied.
Figure 2 is a perspective view of the branch structure (stiffening) of the first embodiment of the present invention.
Figure 3 is a side view of the branch structure (steel) of the first embodiment of the present invention.
4 is a perspective view of the branch structure (hinge support) according to the first embodiment of the present invention.
5 is a bottom perspective view of the branch structure (hinge support) according to the first embodiment of the present invention.
6 is a side view of the branch structure (hinge support) according to the first embodiment of the present invention.
7 is a perspective view of a branch structure according to a second embodiment of the present invention.
8 is a side view of the branch structure according to the second embodiment of the present invention.
9 is a view showing the connection between the branch structure and the main girder according to the second embodiment of the present invention.
10 is a perspective view of a bridge to which a third embodiment of the present invention is applied.
11 is a perspective view of a branch structure according to a third embodiment of the present invention.
12 is a side view of the branch structure according to the third embodiment of the present invention.
13 is a bottom perspective view of a branch structure according to a third embodiment of the present invention.
14 is an enlarged view A of FIG. 12 .

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail so that those of ordinary skill in the art can easily implement them with reference to the accompanying drawings. However, the present invention may be embodied in several different forms and is not limited to the embodiments described herein. And in order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification. Throughout the specification, when a part "includes" a certain element, it means that other elements may be further included, rather than excluding other elements, unless otherwise stated. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The present invention is a technical feature of the configuration of the superstructure installed on the lower structure (2) of the bridge. The superstructure of the present invention includes a main girder 1 and a branch structure 100 (see FIGS. 1, 5, 9 and 10).

The branch structure 100 is installed on the lower structure 2 of the bridge, and the main girder 1 is rigidly connected to the branch structure 100 . 1 , 5 , 9 , and 10 , the branch structure 100 is installed at the branch, and the main girder 1 is connected between the branch structures 100 .

In the bridge according to the present invention, a floor plate and/or slab, pavement body, handrail, etc. may be installed on the main girder 1 and the branch structure 100 that are integrally rigidly connected and connected.

The branch structure 100 includes a branch girder 10 integrally connected to the main girder 1 and a coping part provided under the branch girder 10 to support the branch girder 10 ( 20) is included. The coping part 20 is installed on the upper part of the lower structure 2 .

The branch girder 10 and the coping part 20 may be rigidly connected to each other (refer to FIGS. 2 and 3). When the branch girder 10 and the coping portion 20 are rigidly bonded to each other to become an integral body, the branch structure 100 becomes a ramen type.

In addition, at least one of a hinge support, a roller support, and an elastic support may be provided between the branch girder 10 and the coping part 20 (see FIGS. 4 to 9 and 11 to 14 ). When any one of a hinge support, a roller support, and an elastic support is installed between the branch girder 10 and the coping part 20, the main girder 1 and the branch girder 10 that are integrally connected are supported. It can be a continuous type on top.

In the case of a multi-span bridge, the present invention may be applied to a bridge consisting of only the Ramen type, or may be applied to a bridge composed only of the continuous type, and some points are of the Ramen type and some of the points are of the continuous type. may apply. In the case of a mixed type, the ramen type and the continuous type may be provided to alternate with each other. In addition, the hinge support, the roller support, and the elastic support may be mixed and used at the same point.

The branch girder 10 and the coping part 20 may be provided with a tension member 30 in the vertical direction perpendicular to the axis of the axis, and by tensioning and fixing the tension member, press the branch girder 10 downward. By giving, the negative moment of the branch girder 10 is reduced.

The branch structure 100 of the present invention largely includes the first to third embodiments, and various embodiments in which the first to third embodiments are cross-applied are also possible.

In the first embodiment of the present invention, the coping portion 20 may be V-shaped when viewed from the side of the bridge.

In the first embodiment, the coping portion 20 includes a first inclined member 211; a second inclined member 212; and a lower member 213 .

The first inclined member 211 and the second inclined member 212 are provided to be inclined at a predetermined angle to the horizontal line, and the lower portion of the first inclined member 211 and the lower portion of the second inclined member 212 are the lower portions. It is fixed with the member 213 .

The branch girder 10 is supported on the upper portions of the first inclined member 211 and the second inclined member 212 , and the upper portions of the first inclined member 211 and the second inclined member 212 have a supporting function. , so that the span length between the fulcrum parts can be reduced by the distance between the upper surface of the first inclined member 211 and the upper surface of the second inclined member 212, the amount of deflection of the main girder 1 can be greatly reduced. can

For example, in the case of a two-span bridge having a total length of 60 m, the span is 30 m (60/2) in the conventional structure, whereas in the present invention, the center of the upper surface of the first inclined member 211 and the second inclined member If the distance between the center of the upper surface of (212) is 10m, the span length becomes 25m ((60-10)/2), which has a special effect that can greatly reduce the amount of deflection.

The lower member 213 performs a function of connecting the first inclined member 211 and the second inclined member 212 as well as a function of a reaction force capable of tensioning the tension member 30 . In addition, the main girder and branch girders of the present invention can be applied regardless of the number of girders such as two-row girders (FIG. 2), three-row girders as well as single girders. It also functions as a member for installation. Therefore, an embodiment in which the first inclined member 211 and the second inclined member 212 meet directly at the lower end to be rigidly connected without the lower member 213 is also possible if the above function can be performed.

In the case of two or more rows of girder, the first inclined member 211, the second inclined member 212 and the lower member 213, which are arranged side by side in the throttle direction, may be strengthened and integrated by the cross beam 214, and the cross beam ( 214 may be installed on the lower structure (2).

In the case of two or more rows of girders, the crossbeams 11 are integrally provided between the branch girders 10 and/or between the main girders 1 to reinforce the strength.

The tension member 30 is installed on the branch girder 10 and the lower member 213, and after tensioning the lower member 213 as a reaction force, it is fixed to the branch girder 10, thereby fixing the point. It is possible to reduce the negative moment generated in the secondary girder 10 and the positive moment generated in the main girder.

The tension member 30 includes a steel bar 31 and a fixing member 32, and the steel bar and the fixing member can be selected according to the size of the required prestress, the specifications of the bridge, and the like. The steel bar can be replaced with a stranded wire.

The fixing member 32 may be fixed on the upper surface of the branch girder 10, may be fixed to the lower flange of the branch girder as shown in FIGS. 2 and 3, and may be fixed at another position.

2 and 3 show that the branch girder 10 and the coping part 20 are rigidly connected to each other in the first embodiment. As described above, the branch girder 10 and the coping part 20 are hinged. Combination (see FIGS. 4, 5 and 6) is also possible.

When hinged by the hinge support 41, since the hinge is free to rotate, there is an advantage in that it becomes easy to introduce the prestress in the downward direction applied to the fulcrum girder. In this case, it is possible to give the main girder a soaring if necessary.

In the second embodiment of the present invention, the coping portion 20 may be close to a W shape when viewed from the side of the bridge. The second embodiment is a structure that is easy to introduce prestress in the case of a multi-pillar pier having two or more piers (the structure of the second embodiment can also be used for a single pier, and the structure of the first embodiment can also be used for a two-pole pier Of course you can use it).

The second embodiment is different from the first embodiment in that a member that can be a reaction force of the tension member is provided at a position other than the lower portion of the first and second inclined members. That is, in the second embodiment, the upper member 225 is rigidly fixed between the first inclined member 221 and the second inclined member 222, and the upper member 225 is used as a reaction force to perform prestress in the vertical direction. to introduce

In the second embodiment, the coping portion 20 includes a first inclined member 221; a second inclined member 222; lower member 223; and an upper member 225 .

The first inclined member 221 and the second inclined member 222 are provided to be inclined at a predetermined angle to the horizontal line, and the lower portion of the first inclined member 221 and the lower portion of the second inclined member 222 are the lower portions. It is fixed with the member 223 .

The branch girder 10 is supported on the upper portions of the first inclined member 221 and the second inclined member 222 , and the upper portions of the first inclined member 221 and the second inclined member 222 have a supporting function. , the span length between the fulcrum parts can be reduced by the distance between the upper surface of the first inclined member 221 and the upper surface of the second inclined member 222, thereby significantly reducing the amount of deflection of the main girder 1 can

The lower member 223 not only serves to connect the first inclined member 211 and the second inclined member 212, but also serves as a member for installing a cross beam 224 connecting the neighboring lower members 223. will function If the above function can be performed, an embodiment in which the lower member 223 is not provided and the first inclined member 221 and the second inclined member 222 meet directly at the bottom to be rigidly fixed is also possible.

The tension member 30 is installed on the branch girder 10 and the upper member 225 , and after tensioning the upper member 225 with a reaction force, the tension member is fixed to the branch girder 10 . By doing so, it is possible to reduce the negative moment generated in the branch girder 10 and the positive moment generated in the main girder.

The tension member 30 includes a steel bar 31 and a fixing member 32, and a steel bar and a fixing member are selected according to the size of the required prestress, the dimensions of the bridge, and the like. The steel bar can be replaced with a stranded wire. The fixing member 32 may be fixed on the upper surface of the branch girder 10, may be fixed on the lower flange of the branch girder, and may be fixed at another position.

Also in the second embodiment, the branch girder 10 and the coping part 20 may be rigidly coupled to each other, and any one of a hinge support, a roller support, and an elastic support is provided between the branch girder 10 and the coping part 20 . may be installed.

7, 8, and 9 illustrate an embodiment in which the shape of the upper member 225 is ∧, the shape of the upper member 225 is not limited to the ∧ shape, and the first inclined member 221 and the second Any shape is possible as long as it is rigidly fastened between the inclined members 222 and can be used as a reaction force of the tension member, and in FIG. 8 , the upper surface of the upper member 225 is the first inclined member 221 and the second inclined member ( 222), the height of the upper member 225 can be adjusted according to the size of the required tension, the type and size of the support, and the like.

In the third embodiment of the present invention, the configuration constituting the coping portion 20 may be crossed with X when viewed from the top.

In the third embodiment, the coping portion 20 includes a first horizontal member 231; a second horizontal member 232; It includes a connecting member (233).

The first horizontal member 231 and the second horizontal member 232 are integrally provided to intersect in an X-shape, and the connecting member 233 includes the first horizontal member 231 and the second horizontal member 232 . ) is fastened between (refer to FIGS. 11 and 13).

The tension member 30 is installed on the branch girder 10 and the connection member 233, and introduces a prestress by tensioning and fixing the connection member 233 as a reaction force.

In the third embodiment, when the fulcrum girder 10 and the coping portion 20 are stiffened, the fulcrum girder 10, the first horizontal member 231 and the second horizontal member 232 are formed. It can be rigid, and in the case of having any one of a hinge support, a roller support, and an elastic support, any one of a hinge support, a roller support, and an elastic support on the upper part of the first horizontal member 231 and the second horizontal member 232 You can install one.

Although the connecting member 233 is shown in the horizontal direction in the form of a single figure, a downward convex shape is possible depending on the dimensions of the bridge or the size of the introduced prestress, and an upwardly convex shape as in the second embodiment is also possible. Do.

The branch structure 100 described above is pre-fabricated in a factory, and the basic frame of the bridge can be quickly completed by assembling and connecting integrally with the main girder at the bridge construction site. In the present invention, the construction period can be shortened and efficient construction management is possible by modularizing the branch structure 100, which is the main structure of the bridge, and manufacturing it in the factory.

The branch structure and main girder of the present invention can be manufactured from various materials such as steel, reinforced concrete, and a combination of steel and concrete. Main girder (1), branch girder (10), first inclined member (211), second inclined member (212), lower member (213), first inclined member (221), second inclined member (222) , the lower member 223, the upper member 225, the first horizontal member 231, the second horizontal member 232, the connecting member 233, the cross beam 11, the cross beam (214, 224), etc. the present invention The members constituting the H-beam or I-beam may be used, and a reinforcing member 12 may be provided between the flange and the flange of a portion requiring strength reinforcement.

When the elastic support 42 is provided between the branch girder 10 and the coping part 20 , the elastic support 42 includes an upper plate 421 ; lower plate 422; elastic pad 423; It may include a shear key (424).

An elastic pad 423 is provided between the upper plate 421 and the lower plate 422 to absorb the horizontal displacement and rotational displacement of the branch girder, and a shear key 424 is provided on the upper plate and the lower plate to provide the branch girder. It can also be made to behave like a hinge by constraining the horizontal displacement of

When constructing a pedestrian bridge using the present invention, the lower structure in the curved part or the wide part (observation deck, rest area, etc.) may be formed as a multi-pillar pier.

Although the present invention has been described with reference to the embodiment shown in the drawings, which is merely exemplary, it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible therefrom.

Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

1. Main girder
2. Substructure
100. Branch substructure
10. Branch Girder
11. Crossbeam 12. Reinforcement member
20. Coping part
211. First inclined member 212. Second inclined member
213. Lower member 214. Cross beam
221. First inclined member 222. Second inclined member
223. Lower member 224. Cross beam
225. Upper member
231. First horizontal member 232. Second horizontal member
233. Connection member
30. Absence of tension
31. Steel bar 32. Fusing member
41. Hinge support
42. Elastic support
421. Top plate 422. Bottom plate
423. Elastic pad 424. Shear key

Claims (10)

In a bridge comprising a lower structure (2) and an upper structure provided on the upper portion of the lower structure (2),
The upper structure, the main girder (1); It is installed on the upper portion of the lower structure (2) and includes a branch structure (100) integrally connected to the main girder (1),
The branch structure 100 includes a branch girder 10 and a coping portion 20,
The branch girder 10 is integrally connected with the main girder 1,
The coping part 20 is installed on the upper part of the lower structure 2,
The coping portion 20 includes a first inclined member 221; a second inclined member 222; lower member 223; Including an upper member (225),
A lower portion of the first inclined member 221 and a lower portion of the second inclined member 222 are rigidly coupled to the lower member 223,
The upper member 225 is rigidly coupled between the first inclined member 221 and the second inclined member 222 at the upper portion of the lower member 223,
A tension member 30 is installed in the branch girder 10 and the upper member 225 to reduce the negative moment generated in the branch girder 10 by pressing the branch girder 10 downward. characterized by
A bridge with reduced negative moment at the branch. In a bridge comprising a lower structure (2) and an upper structure provided on the upper portion of the lower structure (2),
The upper structure, the main girder (1); It is installed on the upper portion of the lower structure (2) and includes a branch structure (100) integrally connected to the main girder (1),
The branch structure 100 includes a branch girder 10 and a coping portion 20,
The branch girder 10 is integrally connected with the main girder 1,
The coping part 20 is installed on the upper part of the lower structure 2,
The coping portion 20 includes a first horizontal member 231; a second horizontal member 232; Including a connecting member (233),
The connection member 233 is rigidly coupled between the first horizontal member 231 and the second horizontal member 232,
A tension member 30 is installed in the branch girder 10 and the connecting member 233 to reduce the negative moment generated in the branch girder 10 by pressing the branch girder 10 downward. characterized by
A bridge with reduced negative moment at the branch. delete delete delete 3. The method of claim 1 or 2,
The branch structure 100 is a ramen type in which the branch girder 10 and the coping part 20 are rigidly connected.
A bridge with reduced negative moment at the branch. 3. The method of claim 1 or 2,
The branch structure 100 is a continuous type in which at least one of a hinge support, a roller support, and an elastic support is provided between the branch girder 10 and the coping part 20
A bridge with reduced negative moment at the branch. 3. The method of claim 1 or 2,
The branch structure 100 is,
A ramen type in which the branch girder 10 and the coping part 20 are rigidly coupled
It characterized in that it includes all of the continuous type in which at least one of a hinge support, a roller support, and an elastic support is provided between the branch girder 10 and the coping part 20.
A bridge with reduced negative moment at the branch. 3. The method of claim 1 or 2,
The tension member 30 includes a steel bar or a stranded wire
A bridge with reduced negative moment at the branch. 3. The method of claim 1 or 2,
The branch structure 100 is manufactured in a factory, characterized in that it is integrally connected with the main girder 1 at a bridge construction site
A bridge with reduced negative moment at the branch.

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