KR101339959B1 - Girder for half through bridge and bridge construction method using the same - Google Patents

Abstract

The present invention relates to a girder for a half-through bridge and a bridge construction method using the same to improve the appearance and have structural efficiency in the construction of a half-through girder bridge. The girder for a half-through bridge comprises a hollow box girder and an arch upper outer wall which is extended upward from lower outer walls on the basis of the surface of a bridge. The hollow box girder includes both lower outer walls under the surface of the bridge; a lower inner wall formed between the lower outer walls; and a lower plate formed on the bottom of the lower outer walls.

Description

GIRDER FOR HALF THROUGH BRIDGE AND BRIDGE CONSTRUCTION METHOD USING THE SAME}

The present invention relates to a middle girder and a girder bridge construction method using the same. More specifically, the present invention relates to a middle girder capable of constructing a girder bridge in the form of a middle bridge, and to securing aesthetics and structural efficiency, and a method of constructing a girder bridge using the same.

As the type of bridge according to the position of the road surface (bridge, bottom plate) of the bridge, as shown in Fig. 1, it is classified into Sangro Bridge, Haro Bridge, Jungro Bridge, and two-story bridge.

That is, the Sangro bridge means a bridge in which the bottom plate (bridge) is located in the upper part of the girder, and the Haro bridge means a bridge in which the girder is located in the upper part of the bottom plate, and the middle bridge is a bridge in which the bottom plate is located in the approximately middle portion of the girder. Meaning, two-story bridge means a bridge (cheongdam bridge) so that the bottom plate is formed on the upper and lower portions of the girder, respectively.

At this time, Jungro Bridge is used in many truss bridges and arch bridges because of its characteristics, because it is easy to install the bridge in the middle of the bridge.

However, since trusses or arch bridges require steel trusses and steel arch members, the construction of a general girder bridge as a middle bridge was not suggested unless there is a special need for aesthetics and visibility.

Therefore, the present invention is to solve the problem to provide a construction method to provide a middle girder and a girder bridge construction method using the same can be secured in the structural efficiency in providing the middle girder bridge can reduce the low span and can reduce the weight.

In order to solve the above problems,

First, the lower part of the bottom plate (bridge) is to support the integrated box girders, the upper part of the bridge bridge so that the outer wall of the box girder extends upwards, the outer wall is formed in an arch shape in the longitudinal direction, but in particular span The height of the outer wall at the cavern is increased.

In the middle road bridge according to the present invention, the working load acts as a compressive force by the arch-shaped outer wall so that it can be effectively supported by the outer wall made of concrete, and the box girder under the bridge has a compressive prestress by a tension member. Introduced to effectively resist the tensile force due to the working load.

Secondly, the box girder is formed of a hollow box girder including both outer walls and inner walls, and in the middle of the span, the inner walls are formed with a virendil structure by forming openings spaced apart from each other in the longitudinal direction, thereby securing structural efficiency. It is possible to reduce the weight of the girder.

To this end,

In the middle girder cross section is located in the middle of the girder, The middle girder is a reinforced concrete girder, both lower outer walls located on the lower side relative to the bridge; A lower inner wall formed between the lower outer walls; Hollow box girder comprising a; and a lower bottom plate formed on both lower outer wall and lower lower outer wall; And an arch upper outer wall extending upward from the lower outer wall on the basis of the cross-section, wherein the hollow box girder is provided with a tension member so that compression prestress is introduced and the working load acts as a compressive force by the upper upper wall of the arch. To provide a middle girder and its construction method.

Also preferably,

The negative side wall is formed to have a gentle upward slope from both ends of the middle girder to the middle section of the middle girder, but in the middle of the span so that the upward slope is increased to form a triangular arch upper outer wall, the upper outer wall The upper surface of the upper flange is provided, and in the middle of the span provides a middle girder and the construction method so that the upper flange is formed on both the bottom surface and both side walls of the triangular arch upper outer wall for aesthetics.

Also preferably,

The lower inner wall is formed so that the opening S2 located in the center portion of the middle girder is formed so that the lower inner wall between the openings S2 functions as a vertical material, and the lower inner wall of the upper and lower portions of the opening has an upper current and It serves as a lower chord and the upper and lower ends of the vertical member provides a middle girder and its construction method to be rigid in the upper and lower chords.

According to the present invention it is possible to provide the middle girder bridge.

Furthermore, the middle girder bridge can be applied to a long span of 50m or more in the middle bridge type having a large stiffness in the middle of the span by changing the height of the outer wall of the cross section along the bending moment shape. do.

In addition, the height of the bottom plate and the bottom of the box girder (outer and inner wall) over the entire length of the span to make it easy to apply copper bars and formwork when manufacturing the box girder.

In addition, the outer wall that rises in the middle of the span is a structure that receives compressive force according to the arch shape, and compresses prestress to the box girder below the bridge to cancel the tensile force due to the working load so that the entire middle girder bridge is under the compression region. It is possible to provide a structured form.

In addition, by installing an opening in the inner wall of the span section where the magnitude of the shear force decreases, it is possible to reduce the material and reduce the weight by incorporating a virendil truss structure composed of a vertical member that is stiffened without up, down current and inclined material.

1 shows the type of bridge according to the position of the road surface,
Figures 2a, 2b and 2c is a perspective view of the middle girder bridge according to the present invention, excerpt perspective view and internal configuration,
3 is an installation perspective view of the middle girder bridge of the present invention according to the first embodiment,
4A, 4B and 4C are cross-sectional views of the middle girder bridge according to FIG. 3;
5 is an installation perspective view of the middle girder bridge of the present invention according to the second embodiment;
Figure 6 is a construction of the middle girder bridge according to the present invention.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, except to exclude other components unless otherwise stated.

[Middle girder (A)]

Figures 2a, 2b and 2c shows a perspective view, an extractive perspective view and an internal configuration of the middle girder bridge of the present invention, respectively.

First, referring to FIG. 2A, the middle girder A of the present invention includes a lower outer wall 220, a lower inner wall 230, and a lower bottom plate 240 positioned below the bridge 210. Hollow box girders 200 and

It comprises an arch upper outer wall 300 extending upward from the lower outer wall 220 on the basis of the bridge (210).

According to Figure 2a, the bridge 210 is located in the middle of the middle girder (A) according to the present invention can be seen that the girder used for the bridge, the bridge 210 is hollow as a function of the bottom plate (slab) It can be seen that the upper plate of the box girder 200 is formed.

In this case, it can be seen that the hollow box girder 200 is formed of a box girder in which the hollow portion S1 is formed in the longitudinal direction.

The lower outer wall 220 and the lower inner wall 230 is formed on the upper surface of the lower bottom plate 240 in the longitudinal direction and spaced apart from each other.

The lower outer wall 220 is formed to extend upwards on both side upper surfaces of the lower bottom plate 240, the lower inner wall 230 is formed to extend upward between both lower outer wall (220). Able to know.

Thus, it can be seen that the empty space divided by the lower outer wall 220 and the lower inner wall 230 is formed as the hollow part S1.

The bridge surface 210 is integrally formed on the upper surface of the lower outer wall 220 and the lower inner wall 230.

At this time, the lower base plate 240 is a middle girder bridge made of reinforced concrete because the tensile force is generated by the working load is to place the tension member 400 to resist this.

The middle girder bridge is controlled by the compressive force by the compression prestress introduced into the tension material.

The tension member 400 is to be disposed on the lower outer wall 220 and the lower inner wall 230, but may be used to be exposed to the outside in consideration of when the anchorage is difficult to install due to the lack of fixing section.

The tension member 400 is to be arranged in a parabolic form over the entire length of the hollow box girder 200, as shown in Figure 2c to enhance the introduction effect of the compression prestress by the tension material and can be fixed and dispersed on each wall fixing unit To effectively disperse the tension material 400 exposed to the outside it will be possible for the construction to be arranged horizontally.

In this case, the height between the bridge surface 210 and the bottom plate 240 is maintained in the longitudinal direction at a constant height so that the lower outer wall 220, the lower inner wall 230 and the bridge 210 is installed to be integrally constructed It can be seen that the installation of the copper bar and formwork is easy to ensure the convenience of production.

In this case, as shown in FIG. 2B, since the shear force due to the working load is not large in the middle portion L2 of the lower inner wall body 230, a plurality of rectangular openings S2 are spaced apart in the longitudinal direction, for example.

Accordingly, the lower inner wall 230 between the openings S2 functions as a vertical member 231 and the lower inner wall 230 of the upper and lower portions of the opening serves as the upper chord 232 and the lower chord 233. Since the upper and lower ends of the vertical member are rigid in the upper and lower chords, the vertical and the lower chords function as a beadle truss structure, thereby reducing the self weight of the lower inner wall 230, thereby reducing the overall self weight of the middle girder of the present invention.

2A, the opening S2 is formed in the two lower inner walls 230 in the case of FIG. 2A, and as the transverse width of the middle girder increases, the self-weight reduction effect is maximized.

This is because the shear force generated in the middle portion of the span is not great, even if the opening (S2) is formed, there is no structural problem and because it is formed in a non-lens truss structure is very structurally very efficient.

In addition, the hollow box girder (A) is a structurally very efficient girder because the effect of the warpage, buckling is not large, and the middle girder according to the present invention has a very excellent construction properties because it does not construct a slab separately.

The arch upper outer wall 300 is formed in such a manner as to extend upward from both lower outer walls 220 described above. This is basically necessary to manufacture the middle girder, but the present invention is formed in the arch shape for effectively resisting the compression force because the compressive force is generated due to the working load on the arch upper outer wall (300).

Accordingly, the arch upper outer wall 300 may be formed to have a slightly upward upward slope from both ends of the middle girder to the middle section as shown in FIG. 2C. In particular, in the middle of the span, the upward slope increases to increase the triangle. It can be seen that the arch is formed of the upper outer wall (310).

In addition, the upper surface of the arch upper outer wall 300 is to be formed by the upper flange 320, in the middle of the span to form the upper flange on both the bottom and both side walls of the triangular arch upper outer wall 310 for aesthetics. It can be seen that.

This arch upper outer wall 300 is formed on both sides of the hollow box girder 200 as shown in Figure 2c and connected to the hollow girder so as to be continuous in the longitudinal direction, but the succession of the upper flange, it is found that the appearance is very excellent. Can be.

In this case, the arch upper outer wall 300 may be maintained at the same height based on the longitudinal direction instead of the arch shape. This will be described in Example 2 of the middle girder bridge of the present invention to be described later.

[Middle girder bridge (100)]

3 and 5 are construction views and cross-sectional view according to the first embodiment of the middle girder bridge 100 according to the present invention and the construction view according to the second embodiment.

First, the difference between the first embodiment and the second embodiment is the arch upper outer wall 300 in the case of the first embodiment to form a triangular arch upper outer wall 310, in the case of Example 2 the upper triangular arch The example which does not form the outer wall 311 is shown.

Example 1

Referring to Figure 3, it can be seen that the middle girder (A) is installed in such a way that is mounted on the bridge support to the bridge lower structure 500, such as shifts, bridges, hollow box girder 200 and the upper arch As the outer wall 300, a case where a triangular arch upper outer wall 310 is further formed in the middle of the span may be described.

It can be seen that the tension member 400 is disposed below the hollow box girder A as shown in FIGS. 4A, 4B, and 4C, which are cross-sectional views aa, bb, and cc of FIG. 3, and the tension member 400 is a hollow box. It does not need to be installed so as to be embedded in the lower outer side and inner wall inside of the girder A, and it does not matter even if it exposes to a surface and installs it as an external tension material.

According to Figure 4a it can be seen that the hollow box girder (A) is made of reinforced concrete and consists of both lower outer wall 220 and two lower inner wall 230, the hollow portion between the outer wall and the inner wall ( It can be seen that S1) is formed.

In addition, it can be seen that the tension member 400 is fixed to both ends of the hollow box girder A after tension, and the lower base plate 240, the lower outer wall 220 and the lower inner wall 230 are dispersed so that the fixing portion is dispersed. It can be seen that the tension material settles after tension.

In addition, the bridge 210 is a slab (bottom plate) of the hollow box girder (A) so that the pavement layer is formed on the upper surface, and in the case of the railway bridge, sleepers and rails will be installed, and on the outside of the upper surface, pedestrian roads, etc. will be separately installed. It can be seen that.

In addition, the arch upper outer wall 300 can be seen that the upper flange 320 is formed in the upper in the hollow box girder (A).

Referring to FIG. 4B, it can be seen that the arch upper outer wall 300 is further extended upward in comparison with FIG. 4A, and the tension member 400 is disposed below the walls of the hollow box girder A. FIG. It can be seen that the tension member 400 is arranged in a parabolic form over the hollow box girder (A).

Referring to FIG. 4C, it can be seen that the arch upper outer wall 300 is further extended upward in comparison with FIG. 4B, and the tension member 400 is also disposed below the walls of the hollow box girder A. FIG. Able to know.

In particular, the lower inner wall 230 in the middle of the span so that the hollow portion (S2) can be seen that the lower inner wall 230 is formed in a non-lens truss structure.

FIG. 5 illustrates a case where only the arch upper outer wall 300 is formed, so that the arch upper outer wall 310 having a triangular shape is not further formed.

Unlike the cross-sectional view of the tension member 400 is not shown but may be installed in a parabolic form inside and outside the hollow box girder (A) in the same manner as in Example 1, also in the middle of the span in the lower inner wall (230) By forming the hollow portion S2, it can be seen that the lower inner wall body 230 is formed in a virenal truss structure.

This embodiment 2 can be said to be the case where a hollow box girder A is required such that the square upper arch outer wall 310 is not formed further, so that the height of the upper arch outer wall 300 is properly adjusted. Will be.

[Middle method type girder bridge (100) construction method]

6 illustrates a construction trial view of the middle girder bridge 100 according to the present invention.

First, in order to construct a multi-span middle girder bridge 100 as shown in FIG. 6, a plurality of alternating bridges and piers 510 are spaced apart from each other.

Next, a plurality of the middle girder A is installed by using the bridge support in a manner of mounting the middle girder A described above on the upper part of the bridge 510. At this time, the upper flange of the middle girder (A) is in contact with each other in the continuous portion (point, pier installation portion) to have a continuity, and the connecting end surface of the middle girder (A) is also connected to each other using a tension material. It can be seen that the span girder bridge can be constructed.

Furthermore, it can be seen that the middle girder A without the arch upper outer wall 300 as another girder bridge can also be continuous.

The foregoing description of the present invention is intended for illustration, and it will be understood by those skilled in the art that the present invention may be easily modified in other specific forms without changing the technical spirit or essential features of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is shown by the following claims rather than the above description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

100: middle girder bridge
200: hollow box girder
210: interstitial
220: lower outer wall
230: lower inner wall
231 vertical wall
232: phase present
233: the present
240: bottom plate
300: upper outer wall of the arch
400: tension material
500: bridge undercarriage
510: piers

Claims (6)

In the middle girder cross-section is located in the middle of the girder, the middle girder is a reinforced concrete girder,
Both lower outer walls 220 positioned below the bridge 210; A lower inner wall 230 formed between both lower outer walls 220; Hollow box girder 200 comprising a; and the lower bottom plate 240 formed on both lower outer wall 220 and lower lower outer wall 220; And
And an arch upper outer wall 300 extending upward from the lower outer wall 220 based on the bridge surface 210.
The hollow box girder 200 is provided with a tension member 400 to be introduced into the compression prestress and the working load acts as a compressive force by the arch upper outer wall (300),
The arch upper outer wall 300 is formed to have a gentle upward slope from both ends of the middle girder to the middle section of the middle girder, but the upper slope in the middle of the span increases to the triangular arch upper outer wall 310. The upper surface of the arch upper outer wall 300 is to be formed by the upper flange 320, and in the middle of the span, the upper flange of the triangular-shaped arch upper outer wall 310 and both sidewalls for aesthetics Middle girder, characterized in that to be formed on both. delete The method of claim 1,
The lower inner wall 230 has an opening S2 positioned at the center portion of the middle girder so that the lower inner wall 230 between the openings S2 functions as a vertical member 231 and has an upper portion and The lower inner wall 230 of the lower serves as the upper chord 232 and the lower chord 233 and the upper and lower ends of the vertical member is characterized in that the upper and lower chords to be rigid. The method of claim 1,
The tension member is disposed in the longitudinal direction of the middle girder, characterized in that the lower outer wall 220, the lower inner wall 230 and the lower end plate to be fixed after tension on both end faces. In the middle girder with the bridge is located in the middle of the girder, the middle girder is a bridge construction method using reinforced concrete girder,
Installing a bridge undercarriage 500 including a bridge 510; And
Both lower outer walls 220 positioned below the bridge 210; A lower inner wall 230 formed between both lower outer walls 220; Hollow box girder 200 comprising a; and the lower bottom plate 240 formed on both lower outer wall 220 and lower lower outer wall 220; Arch upper outer wall 300 extending upward from the lower outer wall 220 with respect to the bridge 210 and the longitudinal direction is disposed in both of the lower outer wall 220, the lower inner wall 230 and the bottom plate And installing a middle girder on the bridge undercarriage including a tension member 400 which is fixed to both end faces after being tensioned.
The middle girder is installed so as to be continuously connected to each other between the lower bridge structure to be constructed as a continuous bridge, the upper arch wall outer wall 300 has a gentle upward slope from both ends of the middle girder toward the center of the span. It is formed so that the upper slope in the middle of the span is formed so as to form a triangular arch upper outer wall (310), the upper surface of the upper outer wall (300) is to be formed by the upper flange 320, the center span In the girder bridge construction method using the middle girder, characterized in that the upper flange is formed on both the bottom surface and both side walls of the triangular arch upper outer wall (310) for aesthetic appearance. delete

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