KR100603906B1 - Pc girder bridge of u-type - Google Patents

Abstract

The present invention is a method to induce the conventional ballless plate-shaped bridge, most of the existing ballless plate-shaped bridges have a number of problems in the structural and track maintenance due to the repetitive load of the train. Therefore, the purpose is to improve the running performance of the train by ensuring the safety of the structure and the more efficient maintenance of the track by conducting the induction phase of the plateless bridge.

The present invention is a method of manufacturing a down-type precast concrete member which adopts a transverse prestressing of a size that can be transported in a longitudinal direction, assembling the member in the field and applying a longitudinal prestressing, and then constructing a bridge. As the height of the girder is low, the bottom of the girder is high, so it is relatively effective to increase the communication surface.

U-shaped, guided phase, down slab, prestressed, precast concrete

Description

PC girder bridge of U-type}

1 is a cross-sectional view showing a U-shaped down slab member of the present invention

Figure 2 is a side view showing a U-shaped down slab member of the present invention

Figure 3 is a plan view showing the slab member to the U-shaped down the present invention

Figure 4 is a perspective view of the U-shaped down slab member of the present invention

5 is a perspective view of the assembled state of the slab of the present invention

6 is a perspective view of spraying gravel on the upper slab of the present invention and installing a sleeper and a rail;

 <Description of Symbols for Major Parts of Drawings>

1: U-shaped down slab member 2: Longitudinal sheath pipe

3: lateral PC steel wire 4: new bridge support

5: pier 6: groove

7 protrusion 8 precast gravel

10: gravel

The present invention relates to an induction virtualization method of the existing plate-shaped bridges or down to the PC girder, and more particularly to the induction consisting of a U-shaped down slab of the construction method for the induction virtualization of the plate-shaped bridge consisting of an invisible track for easy track maintenance It is about U-shaped underfloor PC girder, which manufactures upper PC girders and installs bridges in the field, and it can be applied to new bridge girders as well as plate bridges.

First, the term "induction phase" refers to a state in which a gravel is laid on a rail and a sleeper supporting the railroad bridge.

In general, about 50% of the existing railway bridges are steel bridges, and most of the bridges are installed on the ball, and these ballless bridges are vulnerable in terms of durability and structural aspects.

In the case of the ball-less bridge, a pair of rails installed in the longitudinal direction in parallel is supported by a certain interval of sleepers, the sleepers are supported by girders, and the girders are supported by a bridge device installed on the upper part of the shift and piers. do.

However, when the train load is repeatedly applied to these ballless bridges, the sleeper may be damaged by the repeated load on the contact surface of the sleeper and the rail or the contact surface of the girder and the sleeper, and as the phenomenon progresses, the driving noise of the vehicle becomes severe. In the event of failure, the maintenance of the sleeper ring, the girder ring, and the like, deteriorates the train driving stability and increases the vibration and the like, which causes the durability of the bridge. In addition, such remuneration is a temporary measure and needs to be improved in the longer term.

Typical induction technique of conventional plate-shaped bridge is the method of placing slab on existing girders. After pouring and curing of concrete, cutting the girders exposed to the upper part of the slab by the process of induction image, there are the following problems.

During the casting and curing of the slab concrete, cracks and material separation of the slab may occur due to the shock and vibration caused by the train driving, and the adhesion between the girder and the concrete and the corrosion of the steel may be a problem.

Another method is the Precast Slab Pushing method, which is a method of installing a new slab and moving it laterally after installing a temporary vent, a bracket, and a mobile club bogie, which has advantages in applicability of the method and quality control of products. There is a disadvantage in that the cost of installation is increased.

Another method is to construct a precast upper slab made of guided phase in the field using a crane. The upper slab has good quality as a PC product, and it has advantages such as shortening of air. It may be difficult, and it may be difficult to enter the large-scale equipment depending on the conditions of the site. In addition, there is a drawback of not being able to perform a smooth operation because of the limitation of the tank line during crane lifting work.

The present invention is to improve the problems of the conventional induction process as described above, after manufacturing the U-shaped induction PC girder as a factory product and introduced the pre-stressing in the transverse direction, and moved to the site using the track As a method of constructing bridges by introducing directional prestresses, it is intended to secure product quality by manufacturing slab members under U-shape and to shorten the construction period by constructing bridges by on-site assembly.

The present invention is structurally advantageous as a relatively light weight structure, and the height of the girder is relatively low, so that the bottom of the girder is high, so that it is advantageous in terms of securing water permeability and building limits.

The present invention made for this purpose will be described in detail with reference to the accompanying drawings.

In the manufacturing plant, the sheath pipe (2) is installed in the longitudinal direction, and the transverse prestressed PC steel wire is disposed, and the slab member (1) is formed with the U-shaped down slab (1) having the gravel (10) secured at both sides. Reinforce steel bars inside and cast concrete to form one piece. At this time, the lateral prestressed PC steel wire is tensioned and cured by the pretension method.

The slab member 1 is directly installed in the bridge support 4 under the U-shape. A gravel barrier (8) is installed at both ends of the girder to prevent damage to the tracks caused by falling of gravel between the girder and the girder at the pier or the upper part of the girder, or by loosening and contracting the gravel to the temperature expansion and contraction of the girder. Is generated a lot of girder, as well as the deterioration of the piers can also play a role to easily block the leakage.

In particular, this structural form is a mechanically disadvantageous structure. That is, when the gravel wall is installed at the structure or the end that is vulnerable to torsion or transverse vibration as a thin wall open-sided structure, this disadvantage can be compensated for. However, it should be noted that the alignment of the sleepers should be adjusted here.

The slab member 1 is formed with the groove 6 and the protrusion 7 continuous at the side, and the transverse PC strand is disposed at the position where the protrusion 7 is located.

After the U-shaped slab member 1 is manufactured in approximately 2.5m or so (the length of the segment can be adjusted depending on the site conditions), each segment is assembled in the longitudinal direction and the longitudinal sheath pipe (2) is inserted into the strand. Pre-stressing is introduced by post-tensioning to fix at the end and grout inside the sheath pipe (2) so that the PS steel can be sufficiently attached to the concrete member.

  The U-shaped slab member (1) for the induction phase thus produced is mounted using a track, or directly mounted on a site using a crane or the like.

After breaking the track, after removing the existing girder and the bridge support, the new bridge support (4) is installed in advance above the pier (5) at the place where the girder is located, and the new slab member (1) is newly installed with the U-shaped down-slab member. Fix it to the base (4).

After the U-shaped down the slab member (1) to spray the gravel and install the tracks, and then connect the rails by pre-fastening the rail joint, and clean up the tracks.

As described above, the present invention is a U-shaped induction phase girder using induction PC girder, the whole of the girder is a factory product PC, the quality of the product is excellent and bridge construction is made by on-site assembly can shorten the air .

The present invention is advantageous in terms of securing the construction limit and the effect of increasing the cross-sectional area of the girder as the height of the girder is so high that the lower the height of the girder is also structurally advantageous due to the relatively lightweight structure.

The present invention additionally by installing the gravel at the end of both ends of the girder when manufacturing PC products to prevent the separation of gravel at the end of the girder and to prevent the compression and loosening of the gravel according to the temperature to improve the running stability and ride comfort of the train do. In the case of general slab bridges, gravel exists in the space between the girder and the girder, and a leak prevention device is installed between the gravel and the upper part of the slab, but they are easily damaged and leak occurs in most cases, resulting in damage to the girder as well as deterioration of the piers. Cause it to come. However, when the gravel is placed as in the present invention, there is no gravel on the top of the gravel, so it is easy to prevent leakage from here.

In particular, this structural form is a mechanically disadvantageous structure. In other words, if the gravel wall is installed at the end or the structure which is vulnerable to torsion or transverse vibration with the thin-walled open section structure, this disadvantage can be compensated for. However, it should be noted that the alignment of the sleepers should be adjusted here.

Claims (2)

The gravel wall is installed as a PC product at the end of the girder, secures the space for the mold, improves the surface area of the vehicle, improves the building limit, and freely transversely to the U-shaped concrete member 1 with the prestressing arranged in the longitudinal and transverse directions. In an induction PC girder which is applied with tension and connected post-tension in the longitudinal direction at the site under the U-shaped concrete member 1, U-shaped down induction PC girder, characterized in that the concrete member (1) is installed on the top of the new bridge support (4) under the U-shaped with the precast gravel (8) is installed at both ends. (delete)

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