JP2007284895A - Underground railway construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an underground railway construction method which allows the construction of a tunnel of an equal width regardless of a station or a part between stations, compactifies a necessary site, miniaturizes a vertical shaft formed between stations, narrows an underground occupied width, and offers cost advantage. <P>SOLUTION: The underground railway construction method includes a step of digging a U-shaped tunnel 40 using a shield digger composed of a pair of first diggers arranged across a given distance and a second digger connected to the first diggers therebetween, a step of placing by striking an under ground soil retaining wall 44 downward from tunnel shafts at both ends of the U-shaped tunnel 40, a step of placing concrete 54 in the U-shaped tunnel 40 to build a top plate 56 of a railway tunnel 22, and a step of digging interior soil encircled with the ground soil retaining wall 44 and the top plate 56 to build the rest of the building frame 58 of the railway tunnel 22. The step of building the rest of the building frame 58 of the railway tunnel 22 includes a step of building adjacent tracks in the part between stations, using a short underground soil retaining wall, and a step of building a new single track 60 and a platform 62 in the form of two tiers vertically adjacent to each other in the station 52 using the long ground soil retaining wall 44. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a subway construction method, and more particularly to a subway construction method using a U-shaped shield machine and an underground retaining wall.

  In urban areas, continuous three-dimensional projects aimed at eliminating railroad crossings are being promoted, most of which are via viaducts. Will be desired.

  The underground construction of this railway is mainly the excavation method using the construction girder method, but there is a problem that a considerable construction period is required because the construction is mainly carried out in a limited time at the time of stopping the track.

In order to eliminate this, although it increases in cost, construction by a shield method is also performed, and a dedicated shield machine for that purpose (see Patent Document 1) has also been developed.
JP 2002-147169 A

  When constructing a railway by such a shield method, the station section will have a widened section to secure the platform, the underground occupancy will be large, the necessary land width will be large, the shafts provided between the stations will be large, and the cost will be large There is a problem of increasing.

  The object of the present invention is not limited to the station part and the inter-station part, and may be of the same width, the necessary site can be made compact, the shaft provided between the stations can be made small, the underground occupation width is narrowed, and the cost is advantageous. It is to provide a simple subway construction method.

In order to achieve the above object, the subway construction method of the present invention uses a U-shaped shield machine in which a second machine is connected between a pair of first machines arranged at a predetermined interval. Drilling a U-shaped tunnel,
A step of constructing an underground retaining wall from the inside of the tunnel mine at both ends of the U-shaped tunnel,
Placing concrete in the U-shaped tunnel to construct a top plate portion of a railway tunnel;
A step of excavating an internal ground surrounded by the underground retaining wall and the top plate part to construct the remaining frame of the railway tunnel;
Including
In the process of constructing the remaining frame of the railway tunnel,
In the inter-station area, using a short underground retaining wall, building a side-by-side track,
The station section includes a step of using a long underground retaining wall and arranging a single track and a platform side by side in two stages.

  According to the present invention, a U-shaped shield machine and an underground retaining wall constructed from a U-shaped tunnel formed by the shield machine are arranged in parallel at the station. By constructing a track and building a single track and platform in the upper and lower two stages in the station section, it is possible to have the same width regardless of the station section and the inter-station section, the necessary site can be made compact, and the vertical shaft provided between the stations Can be made small, and the underground occupation width can be narrowed, which can be advantageous in terms of cost.

  In addition, after building the top plate, the remaining frame of the railway tunnel is constructed by excavating the underground ground surrounded by the underground retaining wall and the top plate, so the impact on the surrounding ground can be reduced. In addition, even when there is an existing railway on the ground, it becomes possible to suppress track deformation.

In the present invention,
Building a shaft by turning two existing tracks outside the two stations on the ground,
Starting the U-shaped shield machine from the one shaft to the other shaft and constructing the railway tunnel under the existing railway on the ground;
Connecting the track in the tunnel and the existing track on the ground at both ends of the railway tunnel.

  By adopting such a configuration, in addition to the above-mentioned state, in the case of continuous underground railway construction, a shaft is constructed by turning two existing tracks, and a railway tunnel is built under the existing railway. The connection between the railway and the new railway can be made easily, the required land width can be made compact, land acquisition can be minimized, and the construction period can be shortened because the construction of the station part and the inter-station part can be done without cutting. Because the target section is constructed with a single U-shaped shield machine, the cost can be reduced, and the station can be constructed without excavation, which is inconvenient for the user. In addition, since only two shafts are disposed at both ends of the target section, switching from the existing track can be performed in a short time.

  Moreover, since the underground occupation width can be narrowed, when building a building on the ground site, it is easy to stake out and the site can be effectively used.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIGS. 1-9 is a figure which shows construction of the railway continuous underground using the subway construction method concerning one embodiment of this invention.

  1-4 is a figure which shows the construction process of railroad continuous undergroundization.

  FIG. 1 shows an underground section of an existing above-ground railroad that is subject to continuous undergrounding of the railway. The underground section 12 of the existing railway 10 includes two platforms 13 and a platform 14. The existing track 16 is disposed.

  When substituting the existing railway 10, as shown in FIG. 2, two shafts 18 are constructed by turning around two existing tracks 16 outside the two stations 13 on the ground.

  Next, as shown in FIG. 3, a U-shaped shield machine 20 shown in FIG. 9 is started from the inside of one shaft 18 toward the other shaft 18 to be used for a newly installed rail under the existing railway 10 on the ground. A tunnel 22 is constructed.

  The U-shaped shield machine 20 includes, for example, a pair of first machine 24 arranged at a predetermined interval as shown in the front view of FIG. 9 (1) and the plan view of (2), An arcuate second excavator 26 that connects the pair of first excavators 24 is provided.

  The first excavating machine 24 has a circular face plate 24b with a cutter bit on the front surface of the main body portion 24a having a circular cross section, and a face is excavated along the cross-sectional shape of the main body portion 24a by the rotation of the face plate 24b. It is possible.

  A drive motor 28 for rotating the face plate 24b, a shield jack 30, a segment assembly erector 32, and the like are disposed in the main body 24a.

  The second excavator 26 has a cutter 26b on the front surface of a main body portion 26a bent in a bow shape, and a shield jack 34, an erector 36, and the like are disposed in the main body portion 26a.

  In addition, this U-shaped shield machine 20 excavates the ground in the moving direction of the shield machine 20 by the copy cutter 38 and the over cutter, reduces the ground reaction force, and advances the shield jacks 30 and 34. By decentering in the rotational direction with respect to the direction, by applying a rotational force as well as a linear force, or by forcibly injecting a high-concentration plastic fluidized material or the like that has been appropriately consolidated from within the shield machine 20, the shield machine 20 Equipped with a jack that applies upward force to the ground, or a jack that presses the ground, and by applying the upward force to the shield machine 20 by the reaction force of the pressing force by the jack, posture control can be easily performed. .

  When the railway tunnel 22 is constructed, a U-shaped tunnel 40 as shown in FIGS. 5 to 8 is excavated using the U-shaped shield machine 20.

  Next, underground earth retaining walls 42 and 44 are placed and constructed downward from the tunnel mine at both ends of the U-shaped tunnel 40.

  Specifically, in the vicinity of the shaft 18 that forms a part of the rubbing portion 46 with the existing track 16 shown in FIG. 5 and the inter-station portion 48 shown in FIG. 6, the underground retaining wall 42 having a short length is used. The underground retaining wall 44 having a long length is used in the portion 50 and the station portion 52 from the inter-station portion 48 to the station portion 50 shown in FIG.

  Next, concrete 54 is placed in the U-shaped tunnel 40 to construct the top plate portion 56 of the railway tunnel 22.

  Next, the remaining ground 58 of the railway tunnel 22 is constructed by excavating the natural ground surrounded by the underground retaining walls 42 and 44 and the top plate portion 56.

  In this case, in the vicinity 47 of the shaft 18 that forms a part of the rubbed portion 46 shown in FIG. 5 and the inter-station portion 48 shown in FIG. The newly established track 60 is constructed.

  Moreover, in the site | part 50 from the inter-station part 48 shown in FIG. 7 to the station part 50, deep excavation corresponding to the long underground retaining wall 44 is performed, and the height of the two newly installed parallel tracks 60 is gradually increased. I try to change and build.

  Further, in the station section 52 shown in FIG. 8, deep excavation is performed corresponding to the long underground retaining wall 44, the railway tunnel 22 is divided into two upper and lower stages, and a new single track 60 and a platform 62 are provided on each stage. I try to build it.

  As shown in FIGS. 4 and 8, an entrance / exit 64 is constructed at each station 52, and the rubbed portion 46 shown in FIG. 4 is constructed so as to be connectable to the existing track 16 by an open-cut method. 16 is connected to the existing track 16 in a short time.

  As described above, the U-shaped shield machine 20 and the underground retaining walls 42 and 44 constructed from the inside of the U-shaped tunnel 22 formed by the shield machine 20 In the section 48, a new track 60 arranged side by side is constructed, and in the station section 52, the single-track new track 60 and the platform 62 are arranged side by side and constructed in two upper and lower stages, so that the width is constant regardless of the station section 52 and the inter-station section 48. The required site can be made compact, the shaft 18 provided between the stations can be made small, the underground occupation width can be narrowed, and the cost can be made advantageous.

  In addition, after the top plate portion 56 is constructed, the remaining frame 58 of the railway tunnel 22 is constructed by excavating the underground ground surrounded by the underground retaining walls 42 and 44 and the top plate portion 56. The influence on the ground can be reduced, and even when there is an existing railway 10 on the ground, it is possible to suppress track deformation.

  The present invention is not limited to the embodiment described above, and can be modified into various forms within the scope of the gist of the present invention.

  For example, in the above-described embodiment, the case where the underground railway construction is performed using the subway construction method has been described. However, the present invention is not limited to this example, and is applicable to the case where a subway is newly established regardless of the existing railway. Is possible.

  In addition, in the U-shaped shield machine, the second machine may be a straight line instead of a bow, and the first machine may be a box instead of a circle.

It is a top view which shows the state of the conventional railroad in the case of performing railroad continuous underground using the subway construction method concerning one embodiment of this invention. It is a top view which shows the state which turns a track | orbit from the state of FIG. 1, and builds a shaft. (1) is a top view which shows the state which constructs a tunnel from the state of FIG. 2, (2) is the longitudinal cross-sectional view. It is a top view which shows the state which constructs an entrance / exit from the state of FIG. It is sectional drawing which shows the construction state of the tunnel of the shaft vicinity which forms a part of rubbed part with the existing railway in FIG. It is sectional drawing which shows the construction state of the tunnel of the part between stations in FIG. It is sectional drawing which shows the construction state of the tunnel from the part between stations in FIG. 3 to a station part. It is sectional drawing which shows the construction state of the tunnel of the station part in FIG. (1) is a front view of a U-shaped shield machine, and (2) is a plan view thereof.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Existing railway 12 Underground section 13 Station 16 Existing track 18 Vertical shaft 20 U-shaped shield excavator 22 Railway tunnel 24 First excavator 26 Second excavator 40 U-shaped tunnels 42, 44 Underground earth retaining wall 48 Inter-station part 52 Station part 54 Concrete 56 Top plate part 58 Remaining frame 60 New track 62 Entrance / exit part

Claims (2)

Excavating a U-shaped tunnel using a U-shaped shield machine having a second excavator connected between a pair of first excavators disposed at a predetermined interval;
A step of constructing an underground retaining wall from the inside of the tunnel mine at both ends of the U-shaped tunnel,
Placing concrete in the U-shaped tunnel to construct a top plate portion of a railway tunnel;
A step of excavating an internal ground surrounded by the underground retaining wall and the top plate part to construct the remaining frame of the railway tunnel;
Including
In the process of constructing the remaining frame of the railway tunnel,
In the inter-station area, using a short underground retaining wall, building a side-by-side track,
In the station part, using a long underground retaining wall, arranging the single track and the platform side by side,
Subway way construction method characterized by including. In claim 1,
Building a shaft by turning two existing tracks outside the two stations on the ground,
Starting the U-shaped shield machine from the one shaft to the other shaft and constructing the railway tunnel under the existing railway on the ground;
Connecting the track in the tunnel and the existing track on the ground at both ends of the railway tunnel;
Subway way construction method characterized by including.