JP2005060968A - Structure of road tunnel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a road tunnel allowing easy construction and having high stability in its structure. <P>SOLUTION: In this structure of the road tunnel in which an up traffic lane 1 and a down traffic lane 2 running in the reverse direction to the up traffic lane 1 are adjacent, each traffic lane 1, 2 is provided with main lanes 11, 21 and auxiliary lanes 12, 22 arranged on the left side in the direction of running of the main lanes 11, 21 and joining with/branching from the main lanes 11, 21. The traffic lane on one side is provided independently from the traffic lane on the other side and is positioned on the right side of the traffic lane on the other side in its direction of running, and the auxiliary lanes 12, 22 are provided between both traffic lanes. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a structure of a road tunnel in the field of civil engineering, and more particularly to a technique that can be suitably used for a deep road tunnel.

  A road tunnel constructed underground in an urban area mainly includes a main lane 101, an auxiliary lane 102 for joining / branching to the main lane 101, a parking zone 103, and the like. Since the positional relationship between the main lane 101 and the auxiliary lane 102 is left-hand traffic in Japan, the auxiliary lane 102 is arranged on the left side of the main lane 101. Therefore, in the road tunnel having the upper and lower lanes facing each other, the upper and lower main lanes 101 are located in the central portion, and the auxiliary lanes 102 are respectively arranged on the side portions (see FIG. 8). For this reason, the section where auxiliary lanes such as road junctions and branching points are provided has a large road width, leading to an increase in site costs and a prolonged construction period.

  When constructing such a road tunnel, first, the segments are assembled by the shield method and the main lane portion having a circular cross section is constructed. When the tunnel cross-section widening method in the conventional shield method is applied to the construction of the auxiliary lane, after improving the ground of the part that constructs the auxiliary lane, the segment of the assembled main lane is disassembled and aided by the NATM method The lane was widened for construction. However, in order to widen this auxiliary lane, it was necessary to improve the entire ground around the road tunnel, which required a long construction period and cost.

  For example, in the case of constructing a three-lane road tunnel on one side, the inner width of the tunnel is about 16 m, and an inner width of about 30 m is required when branching and merging with two lanes from here. It was not easy to construct such a large space tunnel, which required a huge construction cost and construction period. Furthermore, if an auxiliary lane widened from the main lane is constructed as described above, the cross-sectional shape of the road tunnel becomes unstable because the auxiliary lane having a smaller cross section extends outward than the main lane. . Accordingly, the road tunnel having the conventional structure as described above has to increase the thickness of the tunnel to be constructed, which further increases the cost.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a road tunnel that can be easily constructed and has high structural stability.

  The present invention is a structure of a road tunnel, and is configured as follows to solve the above technical problem.

  The present invention is a road tunnel structure in which an up lane and a down lane traveling in the opposite direction to the up lane are adjacent to each other, and each lane is on the left side in the running direction of the main lane and the main lane. And an auxiliary lane for merging / branching with this lane, one lane is provided independently of the other lane, and is located on the right side of the other lane in the direction of travel The auxiliary lane is provided between the two lanes.

In the present invention, since the arrangement is a right-hand traffic arrangement instead of a normal left-hand traffic arrangement, an auxiliary lane can be arranged between the main lanes, and a simple structure can be achieved. In addition, by collecting auxiliary lanes of each lane between the two lanes, it becomes possible to use the excavated space without waste, and by combining the auxiliary lanes, the overall occupation width is reduced. be able to. In addition, the structure of the road tunnel with the auxiliary lane on the inside is more stable and the thickness of the tunnel lining body is smaller than the structure of the road tunnel with the auxiliary lane on the outside as in the conventional road tunnel. can do.

  As a method for constructing a road tunnel according to the present invention, for example, after each main lane is constructed by a shield method at a certain distance, an auxiliary lane between the main lanes is formed by combining ground improvement and a roof shield from the main lane. There is a way to build. In this way, by providing auxiliary lanes between these lanes, it is possible to construct auxiliary lanes in the ground without the need for large-scale expansion and expansion as in the conventional NATM construction method. It becomes possible to perform construction.

  Furthermore, in the structure of the road tunnel according to the present invention, it is desirable to provide an auxiliary space such as a parking space between both lanes. Conventionally, a parking space such as an emergency parking zone is provided on the left side in the traveling direction of the main lane, like the auxiliary lane, and is disposed on the side of the road tunnel as a whole. For this reason, it has been a factor such as a decrease in structural stability and an increase in occupation width. Therefore, by providing not only auxiliary lanes but also auxiliary spaces such as parking spaces between the lanes, it is possible to further contribute to the reduction of the occupied width.

  Also, in a road tunnel constructed in the underground part straddling the ground part, in the ground part, one lane is located on the left side of the other lane in the traveling direction, and in the underground part, one lane is It is desirable that the vehicle is located on the right side of the other lane in the traveling direction. In the structure of the road tunnel according to the present invention, the left-hand traffic lane is usually replaced to make the right-hand traffic. This right-hand traffic structure can be realized because the up lane and the down lane are provided independently. In general, the underground portion needs to hold a surrounding natural ground and build a road tunnel, and it is easy to provide a lane independently. However, it is not necessary to construct a normal tunnel on the ground, and a median or the like is provided between the two lanes, and the lanes are separated by the median strip. In other words, it is not necessary for the ground portion to have an independent tunnel structure. If an independent road tunnel is constructed for each lane as in the present invention, the construction period and the construction cost are increased. Therefore, in a road tunnel that crosses the ground and underground parts, the ascending lane and the descending lane are arranged on the right side in the underground part, the ascending lane and the descending lane are switched near the ground, and the ascending lane and the descending lane on the ground part. By making the lane a left-hand traffic arrangement, the present invention can be used more suitably.

  Furthermore, in a road tunnel having a merge auxiliary lane for merging into this lane and a branch auxiliary lane for diverging from this lane, the merge auxiliary lane and the branch auxiliary lane have a high height. In the vertical direction, it is desirable that at least a part overlap. For example, by arranging the auxiliary lane for merging in the height direction and arranging the auxiliary lane for branching in the lower direction, it becomes possible to arrange both auxiliary lanes so as to overlap in the vertical direction. The projected area of the lane can be reduced, the space between both lanes can be designed to be small, and the excavated space can be used effectively.

  As described above, according to the present invention, one ascending lane and the other descending lane traveling in the opposite direction to the ascending lane are provided adjacent to each other, and the lane and the traveling direction of the lane are on the left side. It is possible to easily construct a road tunnel provided with the auxiliary lanes for merging / branching arranged and to improve the structural stability of the road tunnel.

  Hereinafter, an embodiment of the structure of a road tunnel according to the present invention will be described in detail. The present embodiment is an automobile-only road that goes back and forth between the ground part and the underground part. FIG. 1 is a schematic plan view of a partial section in the basement of an automobile road according to the present embodiment. This automobile exclusive road is roughly divided into an up lane 1 and a down lane 2 that runs in the opposite direction to the up lane 1, and the arrow shown in the figure is the direction of travel of the car. The up lane 1 is composed of a main lane 11 composed of three lanes and a merge lane 12 for joining the main lane, and the down lane 2 is composed of a main lane 21 composed of three lanes and the main lane 21. It comprises a branch lane 22 for branching from the lane. As for the relative relationship between the up lane 1 and the down lane 2, the up lane 1 is arranged on the left side as viewed in FIG.

  FIG. 2 is a cross-sectional view taken from points A1 to A6 shown in FIG. 1. Based on this cross-sectional view, first, the change in the cross-sectional structure focusing on the up lane will be described in detail. At the A1 point, the main lanes 11 and 21 and the merge lane 12 of the up lane 1 and the down lane 2 are each constructed as an independent tunnel. The merge lane 12 is located above the main lanes 11 and 21 of each lane (see FIG. 2-1). At the point A2, the merging lane 12 descends, and the ring that constructs the main lanes 11 and 21 and the ring that constructs the merging lane 12 are partially connected (see FIG. 2-2). At the point A3, the merging lane 12 is located at the same height as the main lane 11, and is in a state where it can travel to the lane 11. The merge lane 12 is then absorbed by the main lane 11.

  Next, changes in the cross-sectional structure focusing on the down lane 2 will be described in detail based on the cross-sectional view shown in FIG. At point A6, the main lanes 11 and 21 of the up lane 1 and down lane 2 are constructed independently (see FIG. 2-6). Then, a branch lane 22 is separated from the main lane 21 of the down lane 2, and a two-lane branch lane 22 is constructed at the point A5 (see FIG. 2-5). The branch lane 22 moves upward between the main lanes 11 and 21 at a point A4, and is independent of the main lanes 11 and 21 at a point A3 and forms a different ring. Thereafter, the branch lane 22 moves in the upper right direction and moves away from the main lane (see FIG. 2-2).

  An example of the construction method of the automobile road according to the present embodiment configured as described above will be described. First, the main lanes 11 and 21 of the up lane 1 and the down lane 2 are constructed by assembling segments by the shield method. Next, a cross-sectional structure shown in FIG. 2-5, that is, a construction example of the auxiliary lane 22 arranged between the lanes 11 and 21 will be described in detail based on the process schematic diagram of FIG. In constructing the auxiliary lane 22 disposed between the lanes 11 and 21, first, the soil between the lanes 11 and 21 is improved (step 1). A temporary support 31 is assembled to the ground improved portion (step 2). A part of the segment in contact with the part to be widened is disassembled, and the H-shaped steel 33 is installed in the disassembled tunnel opening, and the opened part is reinforced (step 3). After excavating the widened portion surrounded by the temporary support 31 (step 4), the main structure 34 is assembled to the excavated portion (step 5). After the main structure 34 is installed, earth and sand are backfilled in the gap between the natural ground excavated in the step 4 and the main structure 34 installed, and stabilized. In this way, the auxiliary lane 22 arranged between the main lanes 11 and 21 can be constructed.

Next, the road tunnel construction method in the case where another independent auxiliary lane joins from the upper side as in the up lane 1 in the present embodiment, or the case where another independent lane is branched upward from the main lane. One embodiment will be described in detail with reference to FIG. This embodiment is the construction of a road tunnel that joins the upper merging lane to this lane, and corresponds to the A1 to A4 portions in FIG. First, the retaining wall 35 is installed downward from the tunnel constructed between the lanes 11 and 21 to be joined (step 11), and the portion surrounded by the retaining wall 35 is improved (step 12). ). The segment in contact with the ground improved portion is disassembled, and the H-shaped steel 33 is installed in the opened ring portion and reinforced (step 13). The earth and sand surrounded by the retaining wall 35 is excavated (step 14), and the permanent structure 34 is constructed in the excavated portion. In this way, it is possible to construct a road tunnel that merges from above and a road tunnel that branches upward.

  In the above-described embodiment, the merging from the top to the lane and the branching from the lane to the top are performed. However, in this embodiment, the merging from the bottom to the lane and the lane from the lane to the bottom are performed. It is a branched structure. FIG. 5 is a schematic plan view of a part of the underground section of the automobile road according to the present embodiment, and FIG. 6 is a cross-sectional view from B1 to B7 shown in FIG. The road tunnel is roughly divided into an up lane 4 located on the left side and a down lane 5 traveling in the opposite direction to the up lane 4. Each lane is divided into main lanes 41 and 51, and the main lane 41. , 51 and branching / merging lanes 42, 52 disposed below.

  First, based on the cross-sectional view shown in FIG. 6, the change in the cross-sectional structure focusing on the up lane 4 will be described in detail. At the point B1, the main lanes 41 and 51 of the up lane 4 and the down lane 5 are each constructed as an independent tunnel, and the merge lane 42 is located below the main lane 41 (FIG. 6). 1). At the point B2, the merging lane 42 moves upward and is disposed in a ring that constructs the lane 41 (see FIG. 6-2). At the point B3, the merge lanes 42 are separated for each lane, and a merge lane 42a for one lane is arranged in the center (see FIG. 6-3). At the point B4, the merge lane 42a located in the center at the point B3 moves upward and merges with the main lane 41 (see FIG. 6-4). At the point B5, the other merging lane 42b arranged immediately below the main lane 41 is moved and arranged in the center (see FIG. 6-5). At the point B6, the other merging lane 42b rises to the same height as the main lane 41, and is capable of merging and traveling to the main lane 41 (see FIG. 6-6). Thereafter, the merge lane 42 is absorbed by the main lane 41 (see FIG. 6-7).

  Next, changes in the cross-sectional structure focusing on the down lane 5 will be described in detail based on the cross-sectional view shown in FIG. At point B7, the main lanes 41 and 51 of the up lane 4 and down lane 5 are constructed independently (see FIG. 6-7). Then, a branch lane 52a for one lane is separated from the main lane 51 of the down lane 5 (see FIG. 6-6). The branch lane 52a moves downward between the lanes 41 and 51 at the point B5 (see FIG. 6-5). Next, the branch lane 52a moves immediately below the main lane 51, and the branch lane 52b for one lane further branches from the main lane 51 and moves downward (see FIG. 6-4). At the point B3, both branch lanes 52a and 52b are arranged below the main lane 51. (See FIG. 6-3). At the point B2, the branch lanes 52a and 52b are integrated to form a two-lane branch lane 52, which is arranged immediately below the main lane 51 (see FIG. 6-2). At the point B1, the branch lane 52 and the main lane 51 are constructed by independent tunnels (see FIG. 6-1).

  An embodiment of the construction method of the automobile exclusive road configured as described above will be described. This embodiment is a construction of a road tunnel of a branch lane that branches downward from the main lane or a merge lane that merges from the lower side to the main lane, and corresponds to the B1 to B2 portions in FIG. First, the retaining wall 35 is installed downward from the tunnel serving as the lane 41, and the soil surrounded by the retaining wall 35 is improved (step 21). The tunnel segment in contact with the ground improved portion is disassembled, and the H-section steel 33 is installed at the opening portion of the dismantled tunnel to reinforce it (step 22). Next, the soil whose soil is improved surrounded by the reinforced tunnel opening and the retaining wall 35 is excavated (step 23). The permanent structure 34 is constructed in the portion excavated in the step 23 (step 24). In this way, the main lane 41 and the branch / merging lane 42 located below the main lane 41 can be constructed.

It is a plane schematic diagram of a partial section of an automobile exclusive road according to an embodiment. It is sectional drawing from A1 point to A6 point of the motor vehicle exclusive road shown in FIG. It is a process schematic diagram of the example of construction of the exclusive road for cars concerning an embodiment. It is a process schematic diagram of the example of construction of the exclusive road for cars concerning an embodiment. 1 is a schematic plan view of a partial section of an automobile road according to Embodiment 1. FIG. It is sectional drawing from B1 point to B7 point of the motor vehicle exclusive road shown in FIG. FIG. 3 is a process schematic diagram of a construction example of an automobile exclusive road according to the first embodiment. It is a plane schematic diagram of the conventional road tunnel.

Explanation of symbols

1,4 Up lane 2,5 Down lane 11,21,41,51 Main lane 12,42 Junction lane 22,52 Branch lane 31 Temporary support 33 H-section steel 34 Main structure 35 Distillation wall

Claims (4)

A structure of a road tunnel in which an up lane and a down lane traveling in the opposite direction to the up lane are adjacent to each other,
Each of the lanes includes a main lane and an auxiliary lane that is arranged on the left side in the traveling direction of the main lane and merges and branches with the main lane.
One lane is provided independently of the other lane, is located on the right side of the other lane in the traveling direction, and the auxiliary lane is provided between the two lanes. Tunnel structure.   The road tunnel structure according to claim 1, wherein an auxiliary space such as a parking space is provided between the two lanes. The road tunnel is constructed in the underground part straddling the ground part,
In the ground part, one lane is located to the left of the other lane in the direction of travel,
3. The road tunnel structure according to claim 1, wherein one lane is located on the right side of the other lane in the traveling direction in the underground portion. The auxiliary lane has a merging auxiliary lane for merging with the main lane and a branching auxiliary lane for branching from the main lane.
The road tunnel structure according to any one of claims 1 to 3, wherein at least a part of the auxiliary lane for merging and the auxiliary lane for branching overlap in the height direction.

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