JP3665909B2 - Bridge reconstruction method - Google Patents

Description

[0001]
[Industrial application fields]
The present invention is a method for rebuilding an iron girder such as a railway track into a concrete girder or the like without stopping train operation.
[0002]
[Prior art]
Usually, a bridge such as a railway track has a case where an iron girder is erected between abutments and a case where a concrete girder is erected. In the case of iron girders, sleepers are directly installed on the upper surface side of the iron girders, and rails are laid on the sleepers. In the case of a concrete girder, ballast is put on the concrete girder, a sleeper is installed on the ballast, and a rail is laid on the sleeper.
[0003]
In the case of iron girders, in this area, automatic track maintenance work such as multiple tie tampers has to be interrupted, making it difficult to automate track maintenance work. Therefore, recently, there is a tendency to change iron girders to concrete girders that can automate track maintenance.
In the past, when replacing iron girders such as railway tracks with concrete girders or embedded girders with H-shaped steel embedded in concrete, a method called a collective erection method, a horizontal erection method, or a vertical erection method is performed. It was broken.
[0004]
The method of erection using a crane is to construct a new concrete girder, etc., to be newly constructed in advance in another location, remove the existing iron girder with a crane, and then lift the new concrete girder, etc. with a crane and install it on the abutment. is there.
[0005]
In addition, the side-by-side construction method is to construct a concrete girder to be newly constructed at a position next to the track side, remove the existing iron girder, and then slide the new concrete girder laterally through a side-beam and a carriage. How to install.
[0006]
In addition, the vertical installation method is to install a gate-type crane moving rail on the side of the track, construct a concrete girder in a wide place away from the bridge in the track direction, and replace the existing iron girder installed on the bridge with this The concrete girder that has been built in advance after being lifted by a portal crane is lifted by a portal crane, transported to the position of the bridge, and installed.
[0007]
[Problems to be solved by the invention]
However, in the collective erection method using the crane, a crane space is required in the vicinity of the bridge, and cannot be performed in a place without these spaces. In addition, there is a drawback that the cost required for the crane is high.
On the other hand, in the horizontal installation method, a space for constructing a spare concrete girder was required beside the track.
Furthermore, the vertical installation method has a drawback that the entire equipment is enlarged because a portal crane is used. Therefore, this vertical installation method cannot be adopted in a place where a large number of tracks are provided.
[0008]
Moreover, in these conventional methods, in any case, the train operation had to be stopped for a long time from the start of the removal work of the existing iron girder to the completion of the concrete girder installation. For this reason, it was not possible to adopt it in the track section where the train operation interval was short.
Furthermore, in a portion where a main line, a lead-in line overhead line, or the like is provided, a method using a crane may interfere with the overhead line, and cannot usually be adopted.
[0009]
[Means for Solving the Problems]
The present invention is an improvement and removal in view of the above-described problems of the prior art, and without changing train operation and without using heavy equipment such as cranes, the iron girder can be remodeled into a concrete girder or the like. It is intended to provide a method that can be used.
[0010]
Thus, the means adopted by the present invention in order to solve the above problems is a method of reconstructing an iron girder such as a railway line into a concrete girder or the like without stopping the train operation, and supports the rail. Remove the maintenance passages on both sides of the steel girder, and place steel on both sides along the rail direction of the abutment pedestal in the removed area to form side molds. A first concrete girder is constructed by arranging a large number of steel plates of width to form a bottom mold, placing a reinforcing bar between the side mold and the bottom mold and placing concrete. A construction girder along the rail direction was installed on the first concrete girder on both side surfaces of the slab, and a horizontal girder straddling the construction girder was arranged below the rails between the existing sleepers After that, the existing sleepers are removed, then the existing iron girders are removed, and the iron girders are removed. A large number of steel plates with a predetermined width are arranged between the side molds facing the rear space to form a bottom mold, and reinforcing bars are arranged between these side molds and the bottom mold to provide concrete. This is a bridge remodeling method characterized in that a second concrete girder was constructed by casting and the ballast was inserted at the end to remove the construction girder.
[0011]
[Action]
In the bridge remodeling method of the present invention, first, the respective maintenance passages provided on both side portions of the rail of the bridge on which the iron girder is installed are removed. And the base part of the abutment after removal is repaired, and the side formwork which consists of steel materials along a rail direction is arrange | positioned on both sides of each repaired area | region part. Subsequently, a bottom mold made of a steel plate is arranged between the side molds, and after placing reinforcing bars in a space region composed of these side molds and the bottom mold, the concrete is placed, A first concrete girder in which the formwork and the bottom formwork are integrally embedded is constructed.
[0012]
Next, a work girder along both sides of the iron girder is placed on the first concrete girder, and the side spanning between the work girder is placed below the rails between the existing sleepers. Arrange the girders. As a result, the rail load can be supported by the cross beam, the construction beam and the first concrete beam.
[0013]
After that, the existing sleepers will be removed, and then the existing iron girders will be removed. The removal of the iron girder may be performed by fusing the iron girder to a predetermined dimension from the lower surface side of the bridge. And in the space area | region after removing an iron girder, a bottom mold is arrange | positioned between the side molds exposed on the single side | surface of a said 1st concrete girder. Next, reinforcing bars are placed between these side molds and bottom molds, and concrete is placed. Thereby, it is possible to construct | assemble the 2nd concrete girder which supports a rail.
[0014]
After the construction of the second concrete girder for supporting the rail, ballast may be put under the rail and the construction girder may be removed.
Thereby, it is possible to reconstruct an iron girder into a concrete girder, and the first concrete girder can be used as it is as a concrete girder for maintenance inspection.
With the reconstruction method of the present invention, it is possible to carry out without stopping the train operation, and each component can be made small and divided, and construction can be performed without using heavy machinery or the like. is there.
[0015]
【Example】
The construction method of the present invention will be described below based on the embodiments shown in the drawings.
FIGS. 1 to 4 relate to one embodiment of the present invention, and FIGS. 1 (a) to (e) are drawings showing the course of the process, and FIG. 2 is the first concrete girder and construction. FIG. 3 is a longitudinal cross-sectional view showing a relationship with a girder, FIG. 3 is a longitudinal cross-sectional view showing a transverse girder, and FIG. 4 is a longitudinal cross-sectional view showing a connection relationship between a first concrete girder and a second concrete girder for rail support. is there.
[0016]
FIG. 1A is a longitudinal sectional view of a bridge having a conventional iron girder 1. In this conventional bridge, an iron beam 1 is installed between the abutments 2, a sleeper 3 is directly disposed on the upper surface of the iron beam 1, and a rail 4 is laid on the upper surface side of the sleeper 3. In this case, the iron girder 1 and the rail 4 are double-track sections provided for ascending and descending purposes.
[0017]
Maintenance inspection passages 5 are provided on both sides of the iron beam 1 respectively. This maintenance inspection passage 5 is formed by installing steel plates 7 on the upper surfaces of a plurality of H-shaped steels 6 installed in parallel between the abutments 2 and between the sides of the tracks and between the tracks. It is provided in three places.
[0018]
The reconstruction is started from removing the steel plate 7 and the H-shaped steel 6 constituting the maintenance inspection passage 5 from such a state. Then, the upper surface side of the pedestal 2 of the abutment 2 after removal is scraped off by an amount indicated by the oblique lines in FIG. To repair.
[0019]
And it is in the upper surface of the base of the abutment 2 after repair of each inspection channel | path 5, Comprising: On both sides along a rail direction, the side formwork 8 which consists of a steel material of H-section steel, or the side formwork which consists of steel material of a channel 9 is installed. The H-shaped steel side mold 8 has a height of 400 mm, a width of 200 mm, a flange thickness of 6 mm, a web thickness of 9 mm, an overall length of 5.12 m, and a weight of 246 kg. The channel steel side mold 9 has a height of 382 mm, a width of 150 mm, a flange thickness of 6 mm, a web thickness of 9 mm, an overall length of 5.12 m and a weight of 235 kg. The side molds 8 and 9 having such a length and weight can be transported and constructed manually without using a crane.
[0020]
After installing the side molds 8 and 9 made of steel on the upper surface of the base of the abutment 1 after repair, the side molds 8 and 9 on both sides of the line and the side molds 8 between the lines face each other. A bottom mold 10 consisting of a number of steel plates each having a width of 300 mm and a thickness of 6 mm and ribs erected at predetermined intervals is installed on the flange in a direction crossing the rail direction.
After that, in the space formed by these side molds 8 and 9 and the bottom mold 10, reinforcing bars are placed and concrete is placed for maintenance between the tracks and on both sides of the tracks. Instead of the inspection passage 5, a first concrete girder 11 as shown in FIG. 1 (b) is constructed.
[0021]
Next, on the upper surface of the first concrete girder 11, the work girder 12 made of light-weight steel with one side flange on the upper surface side of the H-section steel cut off is installed on both sides of the iron girder 1. This installation may be fastened with a nut 14 by using an implantation bolt 13 embedded in the first concrete girder 11 as shown in FIG.
Moreover, since this construction girder 12 is installed on the upper surface of the concrete girder 11, it is not necessary to make it the length which straddles between the abutments 2, but it is divided into the length which becomes the weight suitable for conveyance of an operator. And install it.
[0022]
After that, as shown in FIG. 3, the cross beam 16 covered with the grooved steel 15 except for the upper surface of the sleeper 3 is inserted between the existing sleepers 3 on the upper surface side of the iron beam 1. Then, both ends are placed between the construction beams 12 and installed. As a result, the load acting on the rail 4 can be supported by the cross beam 16, the construction beam 12 and the first concrete beam 11.
[0023]
After the load acting on the rail 4 is replaced in this way, the existing sleepers 3 and the iron girders 1 that support the sleepers do not function, so that they are removed as shown in FIG. 1 (c). To do. The existing sleepers 3 may be removed on the track surface side, and the iron girder 1 may be removed by fusing the iron girder 1 to a predetermined size from which the lower side of the bridge can be easily removed.
[0024]
Next, in the space region after the iron beam 1 is removed, between the side molds 8 exposed on one side of the first concrete beam 11, for example, a width of 300 mm, a thickness of 6 mm, and a length of 1.70 m. A bottom mold 17 composed of a large number of steel plates provided with ribs is arranged at predetermined intervals.
Then, reinforcing bars are placed in the space region surrounded by the side mold 8 and the bottom mold 17 and concrete is placed. Thereby, as shown in the figure (d) of Drawing 1, it is possible to construct the 2nd concrete girder 18 which supports rail 4. As shown in FIG.
[0025]
It should be noted that the reinforcing bars are arranged to be placed on the flange of the side mold 8 before the bottom mold 17 is installed, and after the bottom mold 17 is installed, it is arranged at a predetermined position. For example, all work can be done from the underside of the bridge, which is convenient. Further, as shown in FIG. 4, when constructing the first concrete girder 11, the reinforcing bar protrudes the reinforcing bar 19 for connecting toward the iron girder 1, and the rebar 20 of the second concrete girder 18. If it connects when arrange | positioning, the connection strength of the 1st concrete girder 11 and the 2nd concrete girder 18 for rail support will improve.
[0026]
After that, as shown in FIG. 1 (e), the embankments 21 are provided at both ends of the left and right concrete girders 11 and 11, and the ballast 22 is placed below the rail 4 to construct the construction girder 12 Can be removed. Thereby, the iron girder 1 can be reconstructed into the second concrete girder 18 and the first concrete girder 11 can be used as it is for maintenance and inspection.
[0027]
By the way, this invention is not limited to the Example mentioned above, A suitable change is possible. For example, the first concrete girder 11 and the second concrete girder 18 for supporting the rail may have H-shaped steel embedded therein. The girder length approximately equal to the length between the abutments 2 is not limited to 5.12 m, but is appropriately determined according to the site. If the girder length is up to about 12 m, it can be carried out only by workers without using heavy machinery, and economically advantageous construction can be obtained.
[0028]
【The invention's effect】
As described above, in the present invention, an iron girder can be remodeled into a concrete girder without stopping train operation. In addition, since each component can be made small and divided, it can be transported manually by workers, and can be constructed without using heavy equipment such as cranes, reducing construction costs. In addition, it is not necessary to block traffic on general roads associated with the use of heavy machinery.
[Brief description of the drawings]
FIG. 1A to FIG. 1E are vertical cross-sectional views showing a process in the middle of an embodiment of the present invention.
FIG. 2 is a longitudinal sectional view showing a mounting relationship between a first concrete girder and a construction girder according to the present invention.
FIG. 3 is a longitudinal sectional view showing a cross beam according to the present invention.
FIG. 4 is a longitudinal sectional view showing a connecting structure of a first concrete girder according to the present invention and a second concrete girder for rail support by reinforcing bars.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Iron girder 2 ... Abutment 3 ... Sleeper 4 ... Rail 8 ... H-shaped steel side formwork 9 ... Groove shaped steel side formwork 10 ... Bottom formwork 11 ... First concrete girder 12 ... Construction girder 16 ... Cross girder 17 ... Bottom formwork 18 ... Second concrete girder for rail support 21 ... Ballast

Claims (1)

Area where iron girder such as railroad track is reconstructed to concrete girder without stopping train operation, and maintenance passages provided on both sides of iron girder supporting rail are removed and removed A steel plate is provided on both sides along the rail direction of the abutment pedestal to form a side mold, and a plurality of steel plates having a predetermined width are arranged between the side molds to form a bottom mold, and the side mold The first concrete girder is constructed by placing reinforcing bars between the bottom formwork and placing concrete, and the construction girder along the rail direction on the first concrete girder on both sides of the iron girder , And after arranging the horizontal girder straddling between the construction girders below the rails between the existing sleepers, remove the existing sleepers, and then remove the existing iron girder, Many steel plates with a predetermined width are placed between the side molds facing the space after the iron girder is removed. Arrange the bottom formwork, arrange the reinforcing bars between these side formwork and the bottom formwork and place concrete to build the second concrete girder, and finally put the ballast Bridge remodeling method, characterized by removing construction girders.

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