JP3848280B2 - Reconstruction method of multi-level crossing bridge - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a construction method that can replace an existing three-dimensional intersection bridge with a new bridge without blocking traffic.
[0002]
[Prior art]
The conventional methods for replacing multi-level crossing bridges are as follows: first, the existing bridges are removed in a lump, and a new bridge is installed at the removed part; Half will be used as an up / down facing traffic lane, the remaining half of the existing bridge will be removed and the first multi-lane new bridge will be built, and then this new bridge will be used as an up / down facing traffic lane. In addition, a method is known in which the remaining existing bridge is removed and a new bridge for a plurality of subsequent lanes is built there to complete the replacement.
[0003]
[Problems to be Solved by the Invention]
Of the above-mentioned replacement methods, the first method of removing existing bridges and installing a new bridge on that part of the construction method is because all vehicles are closed during the replacement period. Unless it is implemented, it is difficult to implement and there is a problem that its availability is very low.
[0004]
On the other hand, among the above-described replacement methods, the second method is, for example, an ascending of a plurality of lanes on an existing bridge having a bridge width of 50% ascending lanes and 50% ascending lanes. It is a method of separating and using the other two lanes that are divided into two lanes facing each other on the side and the down side, but if you remove the part corresponding to one side lane corresponding to 50% of the bridge width The remaining 50% of the bridge width has a problem that a sufficient road width cannot be secured as a two-way traffic lane, resulting in danger of traffic.
[0005]
For this reason, in the construction method that leaves two lanes facing each other on the existing bridge, it is necessary to secure 55 to 60% of the bridge width of the existing bridge as the lane width for that, Therefore, even if a new bridge is installed in the range of about 40 to 45% of the bridge width of the removed existing bridge, this new bridge is too narrow to provide two-way traffic on the up and down sides. There is a problem that it is not possible to obtain a sufficiently wide lane width provided with a central separation line necessary for face-to-face traffic.
[0006]
Furthermore, in the second construction method, due to the structure of the girders and the arrangement of the girders in the existing bridge, it may not be possible to secure two-way traffic, and it is necessary to proceed with the construction as a full-passage or one-way traffic in the middle of the construction. Have a problem.
[0007]
[Means for Solving the Problems]
The present invention is a means for solving the above-mentioned problems in conventional multilevel crossover replacement work, during the period from the partial dismantling of the existing bridge to the completion of the construction of the new bridge without blocking traffic. In addition, the purpose of this project is to provide a replacement method that can secure a large width for existing bridges to obtain a provisional face-to-face traffic lane, and allows the construction to proceed safely and quickly.
[0008]
The construction method of the multilevel crossing bridge according to the present invention is a construction method for replacing the existing multilevel crossing bridge with a new bridge without blocking traffic as a specific means for that purpose. Width and lane and multiple lanes on the downside, the width that allows the installation of the new girder in the closed multiple lanes by securing the upside and downside facing lanes on either lane and closing the other lane After removing the existing bridge in the area, laying the first new girder on the removed part, moving one lane in the face-to-face traffic lane onto the first new girder, then another new construction in the existing bridge The width range in which the girder can be installed is removed, a second newly installed girder is installed in the removed part, and the other lane in the facing traffic lane is moved onto the second newly installed girder. And the first newly installed girder And set aside the lane, and remove all the remainder of the existing bridges, characterized by erection of new digits consisting of the remaining plurality lane width to the removal portion.
[0009]
After removing the part of the existing bridge and installing the first new girder, the part to install the second new girder may be a position adjacent to the first new girder, or part of the existing bridge is removed. Then, after the first new girder is erected, the portion where the second new girder is erected may be at a position separated from the first new girder by separating another part of the existing bridge.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Next, the construction method of the multilevel crossing bridge according to the present invention will be described with reference to the embodiment of the motorway shown in the drawings. FIG. 1 is a perspective view showing the shapes of the existing bridge 1 and the new girder 9 in one step of this construction method. FIGS. 2 to 11 are both an existing bridge 1 having a two-lane floor slab 3 supported by a bridge girder 2 in a portion of a pier 4 and a new installation supported by a pier 10 standing upright at intervals. It is sectional drawing of the same position of the girders 9, 14, 15, and 16. FIG.
[0011]
FIG. 2 shows the shape of the existing bridge 1 before the start of replacement work. On the floor slab 3, a plurality of ascending lanes 5 and a plurality of descending lanes 6 are provided with a central separation line 7 therebetween. Yes. In this embodiment, the upside multiple lanes 5 and the downside multiple lanes 6 are both shown as two lanes, but the upside multiple lanes 5 and the downside multiple lanes 6 are not limited to two lanes. Three lanes or four lanes may be used. In addition, although there is no direct relationship with this replacement work, upside and downside roads 8 are provided on both sides of the existing bridge 1.
[0012]
As shown in FIG. 3, the construction is performed by first stopping and closing the plurality of lanes 5 on either the upside lanes 5 or the downside lanes 6, for example, the downside lanes 6, With the lane 5 alone, a face-to-face lane of the upside lane and the downside lane is secured, and the width range W1 in which the newly installed girder including the left lane of the existing bridge 1 can be installed is removed along the length direction of the bridge.
[0013]
Next, as shown in FIG. 4, a first newly installed girder 9 having a width corresponding to one lane is installed on the removed portion. The first newly installed girder 9 is composed of a bridge girder 11 that is erected at intervals and supported by a plurality of bridge piers 10 and a floor slab 12 that is provided with safety fences 13 on both side edges provided on the bridge girder 11. Has been. In the drawing of this embodiment, a shape using a box girder as the bridge girder 11 of the newly installed girder 9 is shown, but the bridge girder 11 may be an I-shaped shape like the existing bridge 1.
[0014]
When the first newly installed girder 9 is installed, as shown in FIG. 5, one of the two lanes on the downside and the upside facing two lanes used in the upside multiple lanes 5, for example, the central branch The down lane B close to the separation line 7 is moved onto the first newly installed girder 9. Further, at that time, an upside lane A having safety fences 13 on both side edges is left on the right outside of the existing bridge 1, and a new girder including one lane portion on the center separation line 7 side in the existing bridge 1 can be installed. The width range W2 is removed along the length direction of the bridge.
[0015]
As shown in FIG. 5, after removing the width range W <b> 2 where the newly installed girder can be installed on the center separation line 7 side in the existing bridge 1, the second newly installed girder 14 is installed in the removed portion as shown in FIG. 6. Install in parallel with the girder 9. When the second new girder 14 is installed, one safety fence 13 provided on the existing bridge 1 side of the first new girder 9 is removed, and the floor slab 12 and the second new girder 14 of the first new girder 9 are removed. And a safety fence 13 is provided on the existing bridge 1 side of the second newly installed girder 14.
[0016]
After the second newly installed girder 14 is installed as described above, the upside lane A used for the existing bridge 1 is moved onto the second newly installed girder 14 as shown in FIG. 9 and the second newly installed girder 14 secure a two-way traffic lane with an upside lane A and a downside lane B.
[0017]
Subsequently, the remaining width range W3 of the existing bridge 1 is removed, and a third newly installed girder 15 similar to the first newly installed girder 9 and the second newly installed girder 14 is formed in the space of the removed trace as shown in FIG. And the fourth newly installed girder 16 are installed, the center separating line 17 is provided between the second newly installed girder 14 and the third newly installed girder 15, and the safety fence 13 is provided outside the fourth newly installed girder 16 for replacement. Complete the work.
[0018]
As shown in FIG. 8, after the third newly installed girder 15 and the fourth newly installed girder 16 are installed, the two-way traffic lane with the first newly installed girder 9 and the second newly installed girder 14 shown in FIG. 7 is closed. Then, the third newly established girder 15 and the fourth newly established girder 16 are both made up of a plurality of ascending lanes 25, and the first newly constructed girder 9 and the second newly established girder 14 are both made up of a plurality of descending lanes 26, and traffic is completely opened To do.
[0019]
In the above embodiment, as shown in FIG. 3, as shown in FIG. 3, among the upstream and downstream multiple lanes 5, 6, the downstream multiple lane 6 is closed and the upstream multiple lane 5 is in the upstream and downstream. The width lane W1 where the newly installed girder including the left lane of the existing bridge 1 can be installed is secured, but the order is not necessarily limited to this. Close and secure two-way lane 6 on the opposite side of the lane on the upside and downside lanes. First, remove the width range in which the new girder can be installed, including one lane on the right side of the existing bridge 1. The first new girder may be installed here.
[0020]
Moreover, in the said Example, although the width range W1, W2 which can construct the newly installed girder of the existing bridge 1 shall contain one lane part, the width ranges W1, W2 are not necessarily limited to including one lane part. It may include two lanes or three lanes. Accordingly, the first new girder 9 and the second new girder 14 are not limited to the width of one lane, and may include two lanes and three lanes.
[0021]
9 to 11 show a second embodiment of the erection method. In this erection method, the method before reaching the state of FIG. 9 is the same as FIG. 2, FIG. 3, FIG. 4 in the first embodiment, and the states shown in FIG. 9, FIG. 10, and FIG. This is described as a construction method different from the construction method shown in FIGS. 4, 5, and 6 of the first embodiment.
[0022]
As shown in FIGS. 3 and 4 of the first embodiment, after removing a part W1 of the plurality of descending lanes 6 and installing the first newly installed girder 9 at this position, the construction method of the second embodiment Then, it will be in the state of FIG. That is, one of the two upper and lower lanes A and B (see FIG. 4) used in the up-side multiple lanes 5, for example, the down-side lane B near the center separation line 7 is changed to the first newly installed girder 9. Move to.
[0023]
At that time, the central separation line 7 of the existing bridge 1 shown in FIGS. 3 and 4 was removed, and safety fences 13 were provided on both sides in the central portion of the existing bridge 1 as shown in FIG. The upside lane A is provided, and the width range W2 in which the newly installed girder including one lane portion symmetrical to the first newly installed girder 9 in the existing bridge 1 is removed along the length of the bridge. As shown in FIG. 10, the second newly installed girder 14 is erected on the trace of the part W2 of the existing bridge 1 removed, and then, as shown in FIG. Move to the new girder 14.
[0024]
Thereafter, the remaining width range W3 between the first newly installed girder 9 and the second newly installed girder 14 is removed, and the third newly installed girder 15 and the second newly installed girder 15 as shown in FIG. 4 new girder 16 is installed, then the two lanes of the first new girder 9 and the second new girder 14 shown in FIG. 11 are closed, and the third new girder 15 and the fourth new girder 16 are Also, the upside multiple lanes 25 are used, and the first new girder 9 and the second newly installed girder 14 are both downside multiple lanes 26, and the traffic is fully open.
[0025]
【The invention's effect】
In the replacement method according to the present invention, as a first step, the width capable of installing a new girder including one lane portion on the left or right side of the existing bridge is not removed as a first step over the entire width of the bridge. Since the range W1 is removed and the first new girder 9 for one lane is installed in that part, as shown in FIGS. 3 and 4, the existing new girder 9 is installed while the first new girder 9 is installed. A sufficiently wide lane width can be secured on the bridge 1 as a two-way traffic lane for going up and down, and a safe two-way traffic lane can be operated in a sufficient space.
[0026]
If the first new girder 9 is installed, one lane in the two-way traffic lane can be transferred to the first new girder, and the left inner one lane near the central separation line in the existing bridge 1 as shown in FIG. The width range W2 in which the new girder can be constructed including the minute or the width range W2 in which the new girder can be installed including the right outer lane of the existing bridge 1 as shown in FIG. 9 is removed, so both remain. The existing bridge 1 can secure a sufficiently wide and safe lane for one lane, and a wide and safe two-way lane along with the first newly installed girder 9 can be obtained.
[0027]
As shown in FIGS. 7 and 11, when the second newly installed girder 14 is installed and the one-way traffic lane on the existing bridge 1 is transferred to the second newly installed girder 14, these newly installed girder are originally one lane worth. Therefore, the first newly installed girder 9 and the second newly installed girder 14 can be used as a safe two-way traffic lane.
[0028]
In the construction method of the present invention, a part of the closed existing bridge is removed and the first new girder 9 for one lane is installed, and the first newly installed girder 9 is immediately used as a one-way lane for two-way traffic. So, by removing a part of the existing girder remaining in another lane for face-to-face traffic, the second new girder 14 can be installed, but these first and second new girder are Since both can be constructed without depending on the structure of the existing girder, the arrangement and shape of the girder, etc., the construction can be safely proceeded to the last process without being affected by the structure of the existing girder.
[0029]
After the first new girder 9 and the second new girder 14 are installed, the existing bridge 1 left on the right side in FIG. 7 or the existing bridge 1 left in the center in FIG. 11 is removed at once. As shown in FIG. 8, since the third newly installed girder 15 and the fourth newly installed girder 16 can be installed in parallel at the same time, the remaining two lanes by the third newly installed girder 15 and the fourth newly installed girder 16 are provided. Can be installed efficiently in a short period of time, and it is possible to construct a multi-lane crossing bridge safely without blocking traffic.
[Brief description of the drawings]
FIG. 1 is a perspective view showing the cross-sectional shapes of an existing girder and a new girder in one step of the replacement work according to the present invention.
FIG. 2 is a cross-sectional view showing a cross-sectional shape of an existing bridge before the start of replacement work.
FIG. 3 is a cross-sectional view of a state where an existing bridge is to be removed and the remaining existing bridge is used for a two-way traffic lane.
FIG. 4 is a cross-sectional view showing a state in which a first newly installed girder is installed on a mark obtained by removing a part of an existing bridge.
FIG. 5 is a cross-sectional view showing a state in which the first newly installed girder is used for a one-way lane and a range to be removed next to an existing bridge.
6 is a cross-sectional view showing a state in which a second newly installed girder is installed on the removed portion of the existing bridge shown in FIG.
FIG. 7 is a cross-sectional view showing a range to be removed next to an existing bridge using the first new girder and the second new girder in a two-way traffic lane.
FIG. 8 is a cross-sectional view showing a state where the third and fourth new girders are installed next to the first and second new girders and the replacement is completed.
FIG. 9 is a cross-sectional view corresponding to FIG. 5, showing a construction method as another embodiment.
10 is a cross-sectional view corresponding to FIG. 6, which is a construction method according to the embodiment of FIG.
11 is a cross-sectional view corresponding to FIG. 7, which is a erection method according to the embodiment of FIG. 9;
[Explanation of symbols]
1: Existing bridge,
2: Bridge girder,
3: Floor slab,
4: Block,
5: Upward multiple lanes,
6: Downward multiple lanes,
7: Center separation line,
8: Side road,
9: First new girder,
10: Pier
11: Bridge girder,
12: Floor slab,
13: Safety fence,
14: Second new girder,
15: Third new girder,
16: 4th new girder

Claims (3)

It is a construction method to replace an existing three-dimensional intersection bridge with a new bridge without blocking traffic,
Of the existing multiple ascending lanes and descending lanes of the existing bridge, either one of the multiple lanes secures the inbound and outbound lanes, and the other lane is closed,
Remove the existing bridge within the width range where new girder can be installed in closed multiple lanes, and install the first new girder on this removed part,
After moving one lane in the two-way lane onto the first new girder, the width range where another newly installed girder can be installed in the existing bridge is removed, and a second new girder is installed in the removed part. And
The other lane in the two-way traffic lane is moved onto the second newly installed girder, and the second new girder and the first new girder secure an up-and-down two-way traffic lane, and the remaining part of the existing bridge is removed. All removed,
This is a method of replacing a three-dimensional crossing bridge in which a new girder consisting of the remaining multiple lane widths is installed in the removed part. The part of the existing crossing bridge according to claim 1, wherein a part of the existing bridge is removed and a part where the second newly installed girder is installed after the first newly installed girder is installed is a position adjacent to the first newly installed girder. Construction method. The part where the second new girder is installed after the part of the existing bridge is removed and the first new girder is installed is located at a position spaced apart from the first new girder through the other part of the existing bridge Item 3. A method for replacing a three-dimensional intersection bridge according to item 1.

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