JP3867008B2 - Construction method of viaduct - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for constructing a viaduct that is characteristic of a method for constructing a slidable portion that connects a ramp portion of a viaduct and an existing road.
[0002]
[Prior art]
Conventionally, a lot of work has been done to elevate one existing road, such as at a plane intersection of an existing road. At this time, the ramp connecting the existing road and the elevated part is built on the existing road surface, so it is large-scale over a long period from the start of construction of the ramp to the end of the elevated work. Traffic regulations had to be implemented, and traffic jams were caused by these traffic regulations.
[0003]
In such a background, in order to alleviate the traffic jam caused by the traffic regulation accompanying the construction of the ramp section, as shown in FIG. 16, after the bridge girder 21 is horizontally extended over the existing road R, the bridge girder 21 is installed. A method for constructing a viaduct has been proposed in which a slope portion is constructed by inclining to a predetermined gradient.
[0004]
According to such a construction method of the viaduct, since the vehicle can be passed under the bridge girder 21 until the bridge girder 21 is tilted, large-scale traffic regulation is only required for a short period during which the bridge girder 21 is tilted. Traffic congestion caused by traffic restrictions associated with the construction work of the ramp can be greatly eased.
[0005]
[Problems to be solved by the invention]
However, even with the construction method of the viaduct described above, the sliding portion 22 that connects the existing road R and the bridge girder 21 (slope portion) must still be constructed on the existing road R. That is, from the time when construction of the sliding portion 22 is started, until the bridge girder 21 is connected to the sliding portion 22 and the vehicle is driven on the viaduct 20, traffic regulation for avoiding the sliding portion 22 although the distance is short. Must be implemented. For example, as shown in FIG. 17, when a four-lane bridge girder 21 is installed above the existing road R of six lanes (three lanes on one side), the sliding portion 22 naturally has a width corresponding to four lanes. Since it is necessary, the vicinity of the slidable portion 22 has to be one-lane traffic on one side. Therefore, when there is a large amount of traffic, traffic congestion occurs due to traffic restrictions in the vicinity of the slidable portion 22.
[0006]
Accordingly, the present invention is, after rack set the bridge girder in high over the existing roads, in method for constructing a viaduct which is inclined the bridge girder to the predetermined gradient to build ramp portion, due to traffic restrictions due to the construction of the sliding mounting portion It is an object of the present invention to provide a method for constructing a viaduct that can alleviate traffic congestion.
[0007]
[Means for Solving the Problems]
To solve such problems, a first aspect of the present invention, after the call set the bridge girder in high over the existing roads, in method for constructing a viaduct which is inclined the bridge girder to the predetermined gradient to build ramp portion, A method for constructing a viaduct characterized by constructing a sliding portion connecting the ramp and the existing road by lowering the end of the bridge girder inside an underground space formed by digging down the existing road .
[0008]
Such a viaduct construction method is to construct a sliding portion using an underground space formed by digging down an existing road. In this case, when the construction work of the sliding part is not performed, or after the construction work of the sliding part is completed, the vehicle is allowed to pass on the lining board by covering the underground space part with the lining board. Therefore, it is possible to greatly reduce traffic restrictions associated with the construction of the sliding portion.
[0009]
According to a second aspect of the present invention, there is provided a viaduct construction method in which a bridge girder is installed over the existing road, and then the bridge girder is inclined to a predetermined slope to construct a ramp section . The underground space formed by digging down the existing road After assembling the sliding bridge girder, the sliding bridge girder is stored inside the underground space, and then the sliding bridge girder is inclined with a predetermined gradient, A sliding portion connecting the existing road is constructed.
[0010]
Such a viaduct construction method assembles a sliding bridge girder that becomes a sliding portion inside an underground space formed by digging down an existing road, and the inside of the underground space portion until the sliding bridge girder is inclined at a predetermined gradient. The bridge girder for sliding is stored. By covering the underground space with a lining board or the like, the sliding bridge girder does not hinder the passage of the vehicle, and therefore traffic regulations associated with the construction of the sliding portion can be greatly reduced.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 to 8 are diagrams for explaining the procedure of the method for constructing a viaduct of the present invention. In each figure, (a) is a plan view and (b) is a side view. Moreover, FIG. 9 thru | or FIG. 14 is the figure which expanded the underground space part, and each figure shows a front view in (a) and a side view in (b).
[0012]
As shown in FIG. 7, the method for constructing a viaduct according to the present invention is as follows. After the bridge girders 11 and 12 are installed horizontally over the existing road R, the bridge girders 11 and 12 are inclined to a predetermined slope to form the ramp portion A <b> 2. In the construction method of the viaduct to be constructed, the sliding portion A1 that connects the ramp portion A2 and the existing road R is constructed using the underground space portion 1 formed by digging down the existing road R. In the following, a case where a four-lane viaduct A is constructed over the center four lanes (one lane two lanes) of the existing road R of six lanes (one lane three lanes) will be exemplified.
[0013]
(Procedure for construction of viaduct)
As shown in FIG. 1, among the existing roads R of six lanes, the middle two lanes are secured as permanent work zones R2, and vehicles are allowed to pass through the outer lanes R1 and R1 (each two lanes). The pile S11 is driven into the ground with the band R2. Next, as shown in FIG. 9, the footing S <b> 12, the frame S <b> 13, the parapet S <b> 14, etc. are sequentially raised on the pile S <b> 11 and the abutment S <b> 1 for supporting the sliding bridge girder 2 described later is the starting point of the viaduct section. (See FIG. 7). Similarly, the piers S2, S3, S4 and the main tower S5 of the cable-stayed bridge for supporting the bridge girders 11, 12 (see FIG. 7) are constructed at predetermined intervals (see FIGS. 1 and 2). The structural form of the abutment S1, the piers S2 to S4, and the main tower S5 is not limited to the illustrated structural form, and an optimal structural form can be appropriately adopted in consideration of ground conditions and the like.
[0014]
Next, as shown in FIG. 3, the lanes R1 and R1 are restricted to the outermost lane using a time zone with a low traffic volume such as nighttime (hereinafter simply referred to as “nighttime”). An underground space for digging down the existing road R (R1, R2) and producing the sliding bridge girder 2 inside it while building the retaining wall 1a after widening R2 (see FIG. 10 (a)) Build part 1. The underground space 1 has dimensions and a shape that can accommodate a sliding bridge girder 2 described later. Moreover, the earth retaining wall 1a may be constructed with cast-in-place concrete, or may be constructed with a precast L-shaped retaining wall or the like.
[0015]
After the construction of the underground space part 1 is completed, as shown in FIGS. 4 and 11, the lanes R1 and R1 are restricted to one outermost lane at night, and then the sliding bridge girder inside the underground space part 1 Assemble 2 The sliding bridge girder 2 is carried in a state of being divided into a plurality of blocks 2a. Moreover, since it is necessary to provide a relaxation curve in the vertical alignment at the change point of the gradient, it is preferable that the vertical profile on the upper surface of the sliding bridge girder 2 be a relaxation curve shape.
[0016]
In parallel with the construction work for the underground space 1 and the assembly work for the sliding bridge girder 2, the floor slabs 10 a and 11 a are respectively suspended from the main tower S 5 while being suspended by the cables 10 b and 11 b, and are elevated. A bridge girder 10 serving as a part A3 and a bridge girder 11 serving as a ramp part A2 are installed (see FIG. 7). In addition, since it is necessary to provide a relaxation curve in a longitudinal line at the change point of the gradient, in this embodiment, the relaxation curve shape is considered in advance so that a predetermined longitudinal line shape is obtained when the bridge girder 11 is inclined. The bridge girder 11 is installed. That is, the bridge girder 11 is not overhanged in a state of being kept completely horizontal. Moreover, the connection part of the main tower S5 and the floor slab 10a is formed in the structure which can rotate to an up-down direction.
[0017]
As shown in FIGS. 5 and 12, a cover plate 3 is placed over the opening of the underground space 1 in a time zone with a heavy traffic volume such as daytime (hereinafter simply referred to as “daytime”). Secure two lanes on one side. Further, at night, the lanes R1 and R1 are restricted to one outermost lane, and then the lining plate 3 is removed to perform the work. Thus, even if the sliding bridge girder 2 (sliding portion A1) is constructed by appropriately covering the lining plate 3 in the underground space portion 1, it is not necessary to always carry out traffic regulation. Therefore, it is possible to reduce traffic restrictions associated with the construction work of the sliding portion A1, and it is possible to alleviate traffic congestion caused by traffic restrictions.
[0018]
Next, after the vents B1 and B3 are erected on the piers S2 and S3 and the vent B2 is erected between the piers S2 and S3 (see FIG. 5), the floor slab 12a is horizontally projected from the end of the bridge girder 11, A bridge girder 12 is constructed on S2 and S3 (see FIGS. 6 and 12). At this time, if the underground space 1 is covered with the lining plate 3, the work machine can be arranged on the lining plate 3.
[0019]
When the bridge girder 12 is horizontally extended to a predetermined position and installed, as shown in FIG. 7, the length of the wire 11b and the height of the vents B1 to B3 (see FIG. 6) are adjusted to The ramp A2 is constructed by inclining with a gradient.
[0020]
In parallel with the operation of inclining the bridge girders 11 and 12, as shown in FIG. 13, a plurality of heavy trucks 4 equipped with jacks 5 are arranged on both sides of the underground space portion 1 and suspended on the upper surfaces of the jacks 5 and 5. Cross the beam 6. Then, after hanging the wire 7 (see FIG. 13A) hanging from the suspension beam 6 on the sliding bridge girder 2, the sliding bridge girder 2 is lifted and moved, and one end is placed on the abutment S1. At the same time, the other end side (slope portion side) is further lifted to incline the sliding bridge girder 2 to a predetermined gradient. Finally, the bridge girder 12 and the sliding bridge girder 2 are connected to complete the construction of the sliding portion A1 and the ramp portion A2.
[0021]
Then, after paving on the viaduct A, the vehicle passes on the viaduct A (see FIG. 14). In addition, protective fences 1b are installed on both sides of the underground space 1.
[0022]
When the main tower S5 and the cables 10a and 11a are temporary, they are removed and the bridge girder 11 is replaced with the pier S4 (see FIG. 8).
[0023]
Thus, while assembling the sliding bridge girder 2 to be the sliding portion A1 inside the underground space portion 1 and covering the underground space portion 1 with the lining plate 3 as appropriate, traffic accompanying the construction of the sliding portion A1 Regulations can be greatly reduced. That is, if a sliding part is constructed on the existing road R as in the conventional viaduct construction method, the lanes R1 and R1 must always be restricted to one lane near the sliding part regardless of the traffic volume. Although it does not become, while constructing the bridge girder 2 for sliding (sliding part A1) using the underground space part 1 like this embodiment, the underground space part 1 is covered with the lining board 3 when there is much traffic. As a result, it is possible to secure two lanes near the sliding portion A1, and therefore, traffic congestion can be greatly reduced.
[0024]
Further, since the sliding bridge girder 2 is completely stored in the underground space 1 until it is inclined at a predetermined gradient after its assembly is completed, it is used for sliding at an early stage of the construction process of the viaduct A. Even if the bridge girder 2 is constructed, the sliding bridge girder 2 (sliding portion A1) does not hinder traffic. That is, by constructing the sliding bridge girder 2 inside the underground space 1, the degree of freedom in the construction process of the viaduct A is increased, and the construction efficiency is improved.
[0025]
As shown in FIG. 15A, the sliding bridge girder 2 may be assembled with one end placed on the abutment S1, and in this case, as shown in FIG. The heavy truck 4 equipped with 5 is arranged only on the pier S2 side (slope part side) and the sliding bridge girder 2 is lifted.
[0026]
In the present embodiment, the sliding bridge girder 2 is inclined to a predetermined slope using the heavy truck 4 provided with the jack 5, but the present invention is not limited to this. For example, a crane is used. You may make it incline, and you may incline it using the jack arrange | positioned on the lower surface of the bridge girder 2 for sliding. For these, an optimum method may be selected as appropriate in consideration of construction conditions and the like.
[0027]
Furthermore, in this embodiment, although the sliding part A1 was constructed | assembled by inclining the sliding bridge girder 2 assembled inside the underground space part 1, it is not limited to this, For example, illustration Is omitted, but the tip of the bridge girder that extends horizontally may be lowered into the underground space and placed directly on the abutment S1 to form the sliding portion A1.
[0028]
Further, the construction method and the structure type of the bridge girder extending horizontally are not limited to those shown in the drawing. Moreover, in this embodiment, although the bridge girder 12 is installed horizontally using vent B1-B3, it is not limited to this, For example, as shown in FIG. 16, all the bridge girders used as a ramp part are shown. May be constructed by a cable-stayed bridge.
[0029]
【The invention's effect】
According to the construction method of the viaduct according to the present invention, the sliding portion is constructed using the underground space formed by digging down the existing road, and when the construction operation of the sliding portion is not performed, or the construction work After completing the above, it is possible to pass the vehicle on the lining plate by covering the underground space with the lining plate, and thus greatly reduce the traffic congestion caused by the traffic regulation accompanying the construction of the sliding part. Can be reduced.
[Brief description of the drawings]
FIG. 1A is a plan view showing a procedure of a method for constructing a viaduct according to the present invention, and FIG.
2A is a plan view showing a procedure following FIG. 1, and FIG. 2B is a side view of the same.
3A is a plan view showing a procedure following FIG. 2, and FIG. 3B is a side view of the same.
4A is a plan view showing a procedure following FIG. 3, and FIG. 4B is a side view of the same.
5A is a plan view showing a procedure following FIG. 4, and FIG. 5B is a side view of the same.
6A is a plan view showing a procedure following FIG. 5, and FIG. 6B is a side view of the same.
7A is a plan view showing a procedure following FIG. 6, and FIG. 7B is a side view of the same.
8A is a plan view showing a procedure following FIG. 7, and FIG. 8B is a side view of the same.
9A is a front view showing the vicinity of the underground space in FIG. 2, and FIG. 9B is a side view of the same.
10A is a front view showing the vicinity of the underground space in FIG. 3, and FIG. 10B is a side view of the same.
11A is a front view showing the vicinity of the underground space in FIG. 4, and FIG. 11B is a side view of the same.
12A is a front view showing the vicinity of the underground space in FIG. 5, and FIG. 12B is a side view of the same.
13A is a front view showing the vicinity of the underground space in FIG. 7, and FIG. 13B is a side view of the same.
14A is a front view showing the vicinity of the underground space in FIG. 8, and FIG. 14B is a side view of the same.
FIG. 15A is a side view showing another construction method of a sliding bridge girder, and FIG. 15B is a side view explaining a procedure following (a).
FIG. 16 is a side view illustrating a conventional method for constructing a viaduct.
FIGS. 17A, 17B, and 17C are diagrams for explaining a construction procedure of a sliding portion in a conventional viaduct construction method.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Underground space part 2 Bridge girder for sliding 3 Covering board 4 Heavy truck 5 Jack A Viaduct A1 Sliding part A2 Slope part A3 Overpass part S1 Abutment R Existing road R1 Lane R2 Work zone

Claims (2)

After rack set the bridge girder in high over the existing roads, by inclining the bridge girder to the predetermined gradient in method for constructing a viaduct building a ramp portion, of the bridge girder in the interior of the existing underground space portion formed by digging a road A method for constructing a viaduct characterized by constructing a sliding portion that connects the ramp portion and the existing road by lowering the tip . In a construction method of a viaduct in which a bridge girder is constructed with a predetermined slope after a bridge girder is installed over the existing road , a sliding girder is built inside an underground space formed by digging down the existing road. The sliding bridge girder is stored inside the underground space, and then the sliding bridge girder is inclined with a predetermined gradient to connect the ramp portion and the existing road. how to build a highly crosslinked you characterized by constructing a sliding toothed portion.

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