JPH11336471A - How to relocate aboveground railway lines to underground - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a method of relocating a railway business line on the ground to an underground, while shortening the construction period and saving the construction period by performing ground work as much as possible underground. A method for relocating a railway operating line installed on the ground to an underground, comprising the steps of: constructing a shield tunnel 4 at a predetermined position on the ground below the railway operating line; Erecting a plurality of column members 5 outwardly on both sides in the longitudinal direction of the railway operating line toward the ground surface, bridging a girder member 6 between the column members 5, A step of supporting the track facility of the railway business line, a step of excavating a space surrounded by the girder member 6 and the column member 5 to a predetermined depth by using the column member as a retaining pile wall, A step of constructing a tunnel skeleton 3 having a tunnel space in the longitudinal direction of the railway business line, a step of newly establishing a track facility 2 in the tunnel space of the tunnel skeleton 3, and removing the track facility 2 supported by the column members And the step of It is.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for relocating a railway business line on the ground to an underground.

[0002]

2. Description of the Related Art A railroad running on the ground has many railroad crossings in an urban area, which causes traffic congestion, and is required to be resolved. For this reason, continuous grade separation is conceivable. However, if an elevated railway is used, it has adverse effects such as sunshine obstruction, train noise, radio wave obstruction, etc., and the need for underground construction is increasing.

Conventionally, there are a circular shield method and an open-cut method as a method of constructing an underground tunnel to relocate a railway operating line on the ground to an underground. However, the circular shield method shown in FIG. 7 has the following problems. In general, a circular shield tunnel with a diameter of 10m or more is required to secure the construction limit required for an underground tunnel for a double track, often exceeding the railway site width.
Land acquisition and lease are required. Due to the construction, the thickness of the earth covering at least for the diameter (1 in FIG.
・ D or more) is required, and the shaft for starting and arriving must also be constructed at the corresponding depth, which is problematic in terms of construction period and cost. If it is necessary to build a station underground, it will be necessary to construct a separate excavation method.

On the other hand, the above-mentioned open-cutting method has the following problems. It is difficult to secure work space such as pile driving in narrow railway lands, making it difficult to carry in and out materials and handling equipment, and it is also difficult to secure safety. In this case, temporary leasehold or land acquisition is necessary, but this is often difficult. The need to work while the track is closed increases nighttime work inevitably, and the vibration and noise associated with the construction hinders the lives of residents along the railway. Night work has a poor working environment,
This leads to a longer construction period. Retaining walls are likely to be left to block groundwater veins. Displacement of the retaining wall due to excavation tends to cause deformation such as settlement in surrounding facilities and track facilities.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to shorten the construction period by performing ground work as much as possible underground, to acquire leased land and land. It is an object of the present invention to provide a method for relocating a railway business line on the ground to an underground, which can reduce nighttime work and track maintenance work, shorten a track closing time, and reduce costs.

[0006]

According to a first aspect of the present invention, there is provided a method of relocating a railway business line on the ground to an underground according to claim 1, wherein the railway business line installed on the ground is moved to an underground. A method for constructing a shield tunnel at a predetermined position on the ground below the railway business line, and grounding a plurality of pillar members from inside the shield tunnel to both outsides of both sides in the longitudinal direction of the railway business line. Erecting toward the surface, bridging a girder member between the column members, and supporting the girder member on a track facility of the railway business line, and using the column member as an earth retaining pile, Excavating a space surrounded by the girder member and the column member to a predetermined depth; constructing a tunnel body having a tunnel space in a longitudinal direction of the railway operating line in the excavation space; and a tunnel space of the tunnel body. To orbit A step of newly established set, characterized in that it comprises a step of removing the support trajectory facilities to the pillar member.

According to the first aspect of the present invention, the work for erecting the pillar member is performed from within the shield tunnel, thereby reducing the work on the ground and the work at night and the maintenance of the track can be reduced. Down and safety can be improved.

[0008] According to a second aspect of the present invention, there is provided a method for relocating a railway operating line on the ground to an underground, wherein the section of the shield tunnel is constructed to be substantially rectangular.

According to the second aspect of the present invention, the work of erecting the column member is facilitated, and the integration of the tunnel frame and the shield tunnel is also facilitated. In particular, by adopting a vertically long rectangular cross section, the working efficiency can be significantly improved.

[0010] The method for relocating a railway operating line on the ground to an underground according to claim 3 includes a step of casting concrete in the shield tunnel and consolidating the column members according to claim 1 or 2. It is characterized by.

According to the third aspect of the present invention, since the column member is fixed to the concrete in the shield tunnel,
The safety during excavation work and construction of the tunnel skeleton is further improved, and adverse effects such as horizontal displacement and settlement on the surrounding ground can be extremely reduced.

The method for relocating a railway operating line above ground to an underground according to claim 4 includes a step of integrating the shield tunnel with at least a part of the tunnel frame according to any one of claims 1 to 3. It is characterized by.

According to the fourth aspect of the present invention, the tunnel frame is supported by the shield tunnel, and the shield tunnel can be constructed on a good ground even when the supporting force of the ground below the tunnel frame is insufficient. Long-term safety of the tunnel body can be further improved. In addition, the rigidity in the longitudinal direction of the tunnel body is enhanced.

According to a fifth aspect of the present invention, there is provided a method of relocating a railway business line on the ground to an underground according to any one of the first to fourth aspects, wherein the track facility supported by the column member is greened on the site where it was removed.
The method includes a step of planting.

According to the invention of claim 5, the former site of the conventional railway business line can be effectively used as a park, an evacuation route and the like.

According to a sixth aspect of the present invention, there is provided a method of relocating a railway business line on the ground to an underground according to any one of the first to fifth aspects, wherein the railway business line is moved in the transverse direction of the tunnel frame at appropriate intervals in the longitudinal direction of the tunnel frame. The method is characterized by including a step of installing groundwater communication means serving as a groundwater flow path.

According to the invention of claim 6, the construction of the tunnel body does not interrupt the flow of groundwater.
Since the natural groundwater environment is preserved, no adverse effects such as well withering occur.

[0018]

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

The underground tunnel 1 in FIG. 1 comprises a tunnel frame 3, a shield tunnel 4 supporting the tunnel frame 3, and a column member 5 extending from the shield tunnel 4 to the ground surface. The tunnel skeleton 3 can be constructed of a reinforced concrete structure, a steel frame concrete structure, a steel frame reinforced concrete structure, and a steel frame structure. In the present embodiment, the tunnel frame 3 has a reinforced concrete structure.

The tunnel frame 3 is a tunnel having a rectangular cross section formed in the ground at a predetermined depth, and its internal space 34 is large enough to accommodate the track facility 2.
Although the tunnel body 3 can be directly used as a base, it is preferable to design the tunnel body 3 based on a shield tunnel 4 described later.

At least two shield tunnels 4 each having a rectangular cross section are formed in parallel on the lower surface of the tunnel frame 3 along the axial direction, and concrete 7 is cast in each shield tunnel 4. The shield tunnel 4 is constructed by excavating a horizontal shaft using a shield machine having a rectangular cross section before constructing the tunnel frame 3, and lining a steel or reinforced concrete segment 8 on the wall surface of the horizontal shaft.

From the shield tunnel 4, a pillar member 5 also serving as a retaining pile extends outside the side wall 3a of the tunnel frame 3 to near the ground surface. The pillar member 5, which also serves as a soil retaining pile, is erected toward the ground surface while connecting steel pipes 11 of an appropriate length, and the lower part thereof is fixed to concrete 7 in the shield tunnel 4. Note that the column member 5 is not limited to the steel pipe 11 and may be formed of a steel pipe sheet pile.

Further, when there is a groundwater flow that crosses the underground tunnel 1, the following water communication means is provided. That is, as shown in FIG. 2, on the upstream side 13 and the downstream side 14 with respect to the underground tunnel 1, the water collecting part 15 and the drain
And a water passage 17 connecting the water collecting portion 15 and the drainage portion 16 are provided on both sides and a lower portion of the tunnel frame 3 (see FIG. 6). These water collecting section 15 and drain section 1
6. The water passage 17 is filled with good permeable gravel,
It functions so that the groundwater is not blocked by the underground tunnel 1 as a water communication means. That is, as shown in (2) of FIG. 6, the groundwater on the upstream side 13 is supplied to the strainer 15a.
The water flows into the water collecting part 15, flows through the water passage 17 connected to the water collecting part 15, flows out to the drain part 16, and flows out from the strainer 16a of the drain part to the downstream side. .

Hereinafter, a method of relocating a railway business line on the ground to an underground will be described with reference to FIGS. First, as shown in FIG. 2 and FIG. 3, a plurality of sets of shafts 21 and 22 are excavated and formed at appropriate distances on both sides of the track facility 2, and from there, horizontal shafts 23 a for starting and reaching the shield tunnel 4, 23b
Are formed in the transverse direction of the track facility 2 respectively. At least two shield tunnels 4 each having a rectangular cross section are provided at predetermined positions in the ground between the horizontal shafts 23a and 23b (see FIG. 1).
(Three in the example). That is, at least two shield tunnels 4 are constructed along the both sides of the underground tunnel 1 in the deepest part of the underground tunnel 1 at the deepest planned position.

The plurality of shield tunnels 4 are constructed by assembling steel or concrete segments 8 on the wall of a pit excavated by a shield machine. Although these shield tunnels 4 can be constructed simultaneously,
It is preferable to construct one by one in consideration of economy.

The sectional shape of the shield tunnel 4 may be an ordinary circular cross section, but is preferably a rectangular cross section and vertically long. The reason for this is that the work of extending the pillar member 5 and the work of integrating the pillar member 5 with the tunnel frame 3 can be easily and efficiently performed. In order to excavate and form the shield tunnel 4 having such a rectangular cross section, a shield excavator 24 as shown in FIG. 5 is suitable. In the shield machine 24 shown in FIG. 1A, two units in the horizontal direction and four units in the vertical direction are connected to the excavating unit 27 including a pair of drum cutters 25 and a ring cutter 26. Excavates a vertically long rectangular section. The shield machine 24 shown in FIG.
A rectangular cross section is excavated by a planetary cutter 41 that rotates while revolving with the rotation of the disk-shaped bit body 40. Reference numeral 42 denotes a shield frame having a rectangular cross section.

After the construction of such a shield tunnel 4, as shown in FIG. 4, a steel pipe having a proper length from the inside of each shield tunnel 4 toward the ground surface, that is, a length shorter than the inner space height of the shield tunnel 4. 11 is extruded by a small-diameter propulsion method while being welded and added to form a column member 5 or an intermediate pile 39. The intermediate pile 39 is formed when the width of the underground tunnel 1 in the transverse direction is large, and the shield tunnel 4 is also constructed at this installation position. These pillar members 5 are constructed at appropriate intervals in the axial direction of the tunnel, and on both sides of the underground tunnel 1 to be constructed.

By constructing the pillar members 5 from the inside of the shield tunnel 4 in this manner, no work space for construction is required on the ground surface, and the necessity of closing tracks and performing night work is eliminated. The outer ground of the column member 5 (the back ground of the tunnel frame 3) is subjected to ground improvement as necessary by an injection method or the like.

Next, a stud dowel 28 is attached to a lower portion of the column member 5 and the intermediate pile 39 in each shield tunnel 4, and reinforcement reinforcement is provided around these.
Then, concrete 7 is cast at least around the installation positions of the column members 5 and the intermediate piles 39 in the shield tunnel 4 to solidify the column members 5 and the intermediate piles 39. In addition, the tunnel space 7a in which the concrete 7 is not cast can be used as a transport passage for materials and equipment.

By arranging the column members 5 thus solidified at appropriate intervals in a row outside both side surfaces of the tunnel frame 3 to be constructed, the pillar members 5 can also be used as earth retaining piles. In this case, coupled with the fact that the shield tunnel 4 functions as an embedding portion of the retaining wall, the amount of deformation of the retaining wall and the surrounding ground during excavation can be significantly reduced.

As described above, the shaft 23 shown in FIG.
When the two rows of column members 5 are constructed between a and 23b, their heads are aligned at the same level, and the heads of the column members 5 in the tunnel axial direction are connected to each other by bolts or the like with the pillows 18 (FIG. 4). Then, the track in this section is closed, and the track facilities 2 such as the sleepers 9, the rails 10 and the crushed stones 29 are removed,
A horizontal beam 19 is erected on the pillow beam 18 at appropriate intervals in the longitudinal direction of the tunnel. Next, a vertical girder 30 supporting the rail 10 and the sleeper 9 previously set according to the section length.
Is supported by the cross beam 19 via a cushioning material 20 such as a rubber pad. Therefore, the track facility 2 such as the rail 10 and the sleeper 9 is composed of the beam 30, the beam 19 and the beam 18.
Is replaced by a spar member 6 consisting of:

With the sleepers 9 and the rails 10 supported by the heads of the column members 5 in this manner, the adjacent column-shaped column members 5 are welded to each other with the steel plate 12 to retain the retaining wall 50a as shown in FIG.
50b is formed, and the ground surrounded by the column members 5 and the girder members 6 is cut from the upper surface to the upper surface of the shield tunnel 4 while the cutting beams 31 and the bulges 32 are being installed to form a space 33 having a predetermined size. Form.

Then, concrete 51 is poured into the ground at the bottom of the space 33, and the bottom 3b of the tunnel frame 3 is constructed thereon.
2. While removing the intermediate pile 39, construct the side wall 3a and the upper floor portion 3c, and bury the upper part thereof to form the tunnel frame 3
To complete. When there is a groundwater flow in the transverse direction of the tunnel body 3, the underground tunnel 1 as shown in FIG. 1 is constructed by installing a water communication means prior to the construction work. The underground tunnel 1 is continuously constructed with a length of, for example, 2 to 3 km as one unit, and by connecting these, a predetermined underground tunnel can be completed.

Thereafter, a new track facility 2 is installed in the completed tunnel, and is opened as an underground railway business line.
Then, by completely removing the track facility 2 on the ground, the relocation of the railway business line on the ground to the basement is completed. In this case, all of the unnecessary girder member 6, intermediate pile 39 and column member 5 that are no longer needed are removed. It is desirable that the site where the track facility 2 on the ground has been removed be greened and planted so that it can be effectively used as a park or an evacuation site in the event of a disaster.

[0035]

According to the present invention, the work for erecting the pillar members is performed from within the shield tunnel, thereby reducing the work on the ground and the night work and track maintenance work, thereby shortening the construction period, reducing costs and improving safety. Can be achieved.

The work of erecting the column member is facilitated, and the integration of the tunnel frame and the shield tunnel is also facilitated. In particular, by adopting a vertically long rectangular cross section, the working efficiency can be significantly improved.

Since the pillar members are fixed to the concrete in the shield tunnel, the safety during excavation work and construction of the tunnel frame is further improved, and the adverse effects such as horizontal displacement and settlement on the surrounding ground are extremely reduced. be able to.

Since at least a part of the tunnel frame is integrated with the shield tunnel, even if the ground support below the tunnel frame is insufficient, by constructing the shield tunnel on a good ground, the long-term safety of the tunnel frame can be improved. And the axial rigidity of the tunnel is enhanced.

The site of the conventional railway business line can be effectively used as a park, an evacuation route, or the like.

Since the construction of the underground tunnel does not interrupt the flow of groundwater and preserves the natural groundwater environment, there is no adverse effect such as well withering.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a method of relocating a railway business line on the ground to an underground.

FIG. 2 is a plan view showing a method of relocating a railway operating line on the ground to an underground.

FIG. 3 is a side view showing a method of relocating a railway operating line on the ground to an underground.

FIG. 4 is a cross-sectional view illustrating a method of relocating a railway business line on the ground to an underground.

FIGS. 5 (1) and (2) are front views of the shield machine.

FIGS. 6 (1) and (2) are a plan view and a sectional view of a column member and groundwater communicating means.

FIG. 7 is a schematic view showing a conventional method of constructing an underground tunnel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Underground tunnel 2 Track facility 3 Tunnel frame 4 Shield tunnel 5 Column member 6 Girder member 7 Concrete 8 Segment 9 Sleepers 10 Rail 11 Steel pipe 12 Steel plate 13 Upstream side 14 Downstream side 15 Water collecting part 16 Drainage part 17 Water passage 18 Pillow girder 19 Cross girder 20 Buffer material 21,22 Vertical shaft 23a, 23b Horizontal shaft

Claims (6)

[Claims] 1. A method for relocating a railway operating line installed on the ground to an underground, comprising the steps of: constructing a shield tunnel at a predetermined position in the ground below the railway operating line; Erecting a plurality of column members outwardly on both sides in the longitudinal direction of the business line toward the ground surface, bridging a girder member between the column members, and A step of supporting a track facility, a step of excavating a space surrounded by the girder member and the column member to a predetermined depth by using the column member as a retaining pile, and in the excavation space, in a longitudinal direction of the railway business line. A step of constructing a tunnel body having a tunnel space, a step of newly establishing a track facility in the tunnel space of the tunnel body, and a step of removing the track facility supported by the column member, Railway sales How to relocate lines underground. 2. The method according to claim 1, wherein a section of the shield tunnel is constructed in a substantially rectangular shape. 3. The method according to claim 1, further comprising a step of placing concrete in the shield tunnel and solidifying the column members. 4. The method according to claim 1, further comprising a step of integrating the shield tunnel with at least a part of the tunnel frame. 5. The underground railroad business line according to claim 1, further comprising a step of greening and planting the site where the track facility supported by the pillar member has been removed. How to relocate to. 6. The method according to claim 1, further comprising the step of providing groundwater communicating means serving as a flow path of groundwater in a transverse direction of the tunnel skeleton at appropriate intervals in a longitudinal direction of the tunnel skeleton. A method of relocating a railway business line above the ground to the basement.