JP2008308854A - Method of constructing ballast part in tunnel and the ballast part - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of constructing a ballast part in a tunnel capable of securing a passage for safely traveling construction vehicles in a ballast part district under construction by a simple construction and also provide the ballast part. <P>SOLUTION: This method of constructing a ballast part in a tunnel comprises: a pedestal member installation step S20 of continuously installing pedestal members 14 each having an upper surface of a predetermined width at a predetermined height in the axial direction of the tunnel that the upper surfaces are generally horizontal at the center of the bottom part in the tunnel; and a backfilling step S30 of laying down a backfilling material in the spaces at the bottom part of the tunnel on both sides of the continuously installed pedestal members 14 for backfilling the spaces. The upper surfaces of the continuously installed pedestal members 14 are used as the passage for moving the construction vehicles in the ballast part district under construction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a technique for constructing a road bed in a tunnel, and more particularly to a technique for securing a passage through which a construction vehicle or the like can safely pass in a road bed section being constructed.

  Conventionally, when constructing the roadbed part in the tunnel and excavating the tunnel at the same time, the material of the roadbed part under construction is carried into the excavation tip part, the earth and sand from the excavation tip part, etc. For example, a method of installing a temporary bridge through which a construction vehicle or the like can pass in the construction section of the road bed, or a road bed as disclosed in Patent Document 1 A method of building is proposed.

In Patent Document 1, by placing concrete or the like in advance on one side of the bottom of the tunnel, the other bottom of the tunnel is used as a passage for a construction vehicle or the like until the roadbed is hardened. A method is disclosed in which, after the road bed is cured, the road bed is changed to a passage and the remaining road bed on the other side is constructed.
JP 2003-138886 A

  However, in the former method of installing a temporary bridge, the installation and replacement work takes time, construction time, and construction cost.

  Moreover, in the latter construction method described in Patent Document 1, for example, when the curvature of the tunnel bottom surface is large, the roadside portion constructed in advance may be set to the necessary minimum width, but the other side For example, when the earth and sand transporter or the like travels, there is a possibility that the earth and sand loaded in the lateral direction may spill out or may not travel safely. Further, when the width of the tunnel is so narrow that the construction vehicles cannot be separated from each other, this roadbed construction method cannot be used.

  The present invention has been made in view of the above points, and a method for constructing a roadbed portion in a tunnel and a road for the same that can secure a passage through which a construction vehicle or the like can safely pass in the constructed roadbed section by simple construction. The purpose is to provide a floor.

In order to achieve the above object, the present invention provides a method for constructing a road bed in a tunnel,
A pedestal member installation step in which a pedestal member having an upper surface with a predetermined height at a predetermined height is continuously installed in the tunnel axial direction so that the upper surface is substantially horizontal at the bottom center in the tunnel;
A backfilling step in which a backfilling material is laid back in the space at the bottom of the tunnel on both sides of the pedestal member installed continuously;
The upper surface of the pedestal member installed continuously is used as a passage for moving the road bed section under construction (first invention).
According to the construction method of the road bed portion in the tunnel of the present invention, the construction vehicle or the like can be safely passed by using the upper surface of the base member as a passage for moving the road bed section being constructed.

Even if the width of the tunnel is narrow, it is possible to pass the roadbed section under construction as long as at least one vehicle has a width that allows it to pass.
Moreover, since the upper surface of the pedestal member is not only used for the passage, but also becomes a part of the road bed, the amount of backfill material to be laid can be reduced.
In addition, after the pedestal member is installed, during the backfilling process, the passage on the pedestal member can be used for loading and unloading materials such as construction vehicles and waste materials to the excavation tip, so the roadbed in the tunnel Construction and tunnel excavation can be performed in parallel, contributing to shortening the construction period.

According to a second aspect of the present invention, in the first aspect, prior to the base member installation step, a horizontal portion in which a structure having a substantially horizontal portion on the upper surface is continuously installed in the tunnel axial direction on the inner peripheral bottom surface of the tunnel. Including a formation step, wherein the pedestal member installation step is characterized in that the pedestal member is continuously installed in the tunnel axis direction on the upper surface of the structure formed in the horizontal portion formation step.
According to the method for constructing a tunnel floor in the tunnel according to the present invention, the pedestal member can be stably installed on the substantially horizontal portion formed in the horizontal portion forming step.

  In a third aspect based on the second aspect, the structure is constructed by laying a covering material having a substantially planar upper surface and a lower surface having a shape corresponding to the inner peripheral bottom surface of the tunnel. It is characterized by that.

  According to a fourth invention, in the third invention, an inverted block is used as the covering material.

  A fifth invention is the invention according to any one of the first to fourth inventions, wherein a track is laid in the passage, a freight car moving on the track is installed, and the freight car is used as a transport means for transporting materials and waste materials. It is characterized by using.

  A sixth invention is characterized in that, in any one of the first to fifth inventions, crushed stone and fluidized soil are used as the backfill material.

A seventh invention is the solidification material for solidifying the excavated soil into excavated soil generated when excavating the tunnel as at least part of the backfill material in any one of the first to fifth inventions. Or a mixture obtained by dewatering the excavated soil.
According to the method for constructing a road bed in a tunnel according to the present invention, it is possible to carry out the excavated soil out of the tunnel by effectively utilizing the excavated soil generated when the tunnel is excavated as a material for constructing the road bed. Can be reduced, and the cost of the material for constructing the roadbed and the labor for carrying in the material can be reduced.

  According to an eighth aspect of the present invention, there is provided a roadbed portion constructed in a tunnel, wherein a pedestal member having an upper surface with a predetermined height at a predetermined height is provided at the center of the bottom portion of the tunnel, and the tunnel is formed so that the upper surface is substantially horizontal. It is continuously installed in the axial direction, and a backfill material is laid in the space at the bottom of the tunnel on both sides of the continuously installed base member.

In a ninth aspect based on the eighth aspect, the pedestal member is a culvert.
According to the road bed constructed in the tunnel of the present invention, the base member can be procured at low cost.
In addition, since the culvert is hollow, it can be used as a material carrying path to the excavation tip during tunnel construction, or a wiring path, drainage path, or inspection or emergency path during tunnel operation. it can.

  ADVANTAGE OF THE INVENTION According to this invention, the construction method of the road bed part in a tunnel which can ensure the channel | path which a construction vehicle etc. can pass safely to the road bed part under construction by simple construction and its road bed part can be provided.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a process diagram showing a process of constructing a road bed in a tunnel according to the present embodiment.
As shown in FIG. 1, the roadbed portion is constructed by construction including an invert construction step S10, a pedestal member installation step S20, and a backfilling step S30.

FIG. 2 is a view for explaining the details of the invert construction step S10 and the pedestal member installation step S20. FIG. 2 (a) is a longitudinal sectional view in the tunnel extension direction, and FIG. 2 (b) is the same view (a). A cross-sectional view taken along the line A-A in FIG. 4C is a cross-sectional view taken along the line B-B in FIG.
As shown in FIG. 2 (a), the present embodiment is applied when the roadbed is constructed in a tunnel without hindering excavation and lining (left side in the figure), for example.

  First, in the invert construction step S <b> 10, for example, the invert block (horizontal plane) is constructed in the center of the bottom of the tunnel 10 by laying the invert block 12 continuously in the center of the bottom of the tunnel 10 in the tunnel axial direction.

  The invert block 12 is a precast concrete material having a substantially planar upper surface and a lower surface having a shape corresponding to the inner peripheral surface of the segment 13. The invert block 12 is designed such that its upper surface has a width that allows a pedestal member 14 to be described later to be placed thereon.

  The invert block 12 is transported from the wellhead side of the tunnel 10 to the vicinity of the installation position of the invert block 12 by a freight car 18 (for example, a freight car) that moves on the base member 14 that has been laid in a base member installation step S20 to be described later. The crane 16 is installed at the center of the bottom of the tunnel 10 (see FIG. 2B).

  In the invert construction step S10, the invert block 12 is used in constructing the invert portion (horizontal plane) at the center of the bottom of the tunnel 10, but this is not restrictive. For example, concrete is directly placed on the bottom of the tunnel 10. Alternatively, a segment having an invert portion in advance may be arranged at the bottom of the tunnel 10 at the time of tunnel lining.

  In the base member installation step S20, the base member 14 is continuously laid in the tunnel axis direction on the invert block 12 installed in the invert construction step S10.

  For the pedestal member 14, for example, a box (box shape) or a portal culvert having a rectangular cross section and a hollow inside is used. However, when the pedestal member 14 is placed on the invert block 12, the upper surface thereof is horizontal and has a width necessary for the freight car 18 to move, and the material is passed through the upper surface. As long as it has the intensity | strength which can support the weight of the freight car 18, it is not restricted to a rectangular shape, A trapezoid shape etc. may be sufficient. The height of the pedestal member 14 is set so that, for example, the upper surface of the pedestal member 14 placed on the invert block 12 is the height of the roadbed portion built in the tunnel 10.

  Similarly to the invert block 12, the pedestal member 14 is also transported to the vicinity of the laying region by a freight car 18 moving on the already laid pedestal member 14, and is installed on the invert block 12 by the material transport crane 16 (FIG. 2 ( c)).

  A track 20 for running the freight car 18 is laid on the base member 14 that is continuously installed. In addition to the invert block 12 and the pedestal member 14, the freight car 18 is used, for example, for transporting materials used for excavation, a segment 13 for lining, and the like. The track 20 is also used as a travel path of a dump truck that can travel on the track 20 (hereinafter referred to as “railway vehicle 22”). If the width on the pedestal member 14 is sufficiently large, the construction vehicle or the like may run as it is without laying the track 20.

  3A and 3B are diagrams for explaining the details of the backfilling step S30. FIG. 3A is a longitudinal sectional view in the tunnel extending direction, and FIG. 3B is a cross-sectional view taken along the line CC in FIG. (C) is a DD cross-sectional view in (a), and (d) is an EE cross-sectional view in (a).

  As shown in FIG. 3, in the backfilling step S30, a backfilling material is laid in the backfilling regions X and Y at the bottom of the tunnel 10 on both sides of the pedestal member 14 that has been continuously laid (FIG. 3B). ) To (d)).

  In the backfilling step S30, for example, step S310 for laying the crushed stone 24, step S320 for laying fluidized soil on the crushed stone layer, and step S330 for laying crushed stone again on the fluidized soil layer, Thus, the areas X and Y are backfilled.

  In step S310, for example, the crushed stone 24 transported to the backfill areas X and Y by the track-rail vehicle 22 traveling on the track 20 is thrown into the bottom from the pedestal member 14. The rail car 22 is configured such that the loading platform is inclined in the lateral direction so that the crushed stone 24 can be put into the backfill regions X and Y on both sides. The crushed stone 24 dropped on the bottoms of the regions X and Y is leveled while being compacted using the vibration roller 26 or the like.

  In step S320, the fluidized soil 28 is placed at one time or a plurality of times depending on the region (in FIG. 3, it is divided into two times).

  The fluidized soil 28 is a backfill material obtained by mixing mud with cement. The fluidized soil 28 is mixed and processed in a roadbed 32 or a plant installed outside or inside the tunnel 10 and is pumped through the placement pipe 30 to the backfill areas X and Y. The placement tube 30 is extended to the regions X and Y using the base member 14 or the fluidized soil 28 already solidified. Further, the backfilling step S30 may be performed simultaneously in the regions X and Y, or may be performed separately.

  In step S330, after the fluidized soil 28 is sufficiently cured and solidified, the track 20 on the pedestal member 14 and the solidified fluidized soil 28 are passed through the railroad vehicle 22 and other dump trucks, etc. Transport and lay on fluidized soil 28. The leveling work is performed in the same manner as in step S310. And construction of the roadbed part 32 is completed by laying and leveling the crushed stone 24 until the surface of the crushed stone 24 becomes the same level as the upper surface of the base member 14.

  According to the method for constructing the roadbed portion of the present embodiment described above, the pedestal member installation step S20 in which the pedestal member 14 is continuously installed at the center of the bottom portion in the tunnel in the tunnel axis direction so that the upper surface is horizontal. And a backfilling step S30 in which a backfilling material is laid back in the bottom spaces X and Y of the tunnel 10 on both sides of the pedestal member 14, and the upper surface of the pedestal member 14 is the roadbed section being constructed. By using it as a passage for moving, construction vehicles and the like can be safely passed.

  Even if the width of the tunnel 10 is narrow, it is possible to pass the roadbed section under construction as long as at least one vehicle has a width that allows the tunnel 10 to pass.

  Moreover, since the upper surface of the base member 14 is not only used for the passage, but also becomes a part of the road bed, the amount of backfill material to be laid can be reduced.

  In addition, since the track 20 on the pedestal member 14 can be used for loading and unloading materials such as construction vehicles and waste materials to and from the excavation tip during the backfilling step S30 after the pedestal member 14 is installed, The construction of the roadbed portion and the excavation of the tunnel 10 can be performed in parallel at the same time, which can contribute to shortening the construction period.

  Moreover, the base member 14 can be stabilized by installing the base member 14 on the invert part (horizontal part) constructed | assembled by the invert construction process S10.

  Furthermore, the pedestal member 14 can be procured at low cost by using a box culvert or a portal culvert as the pedestal member 14. In addition, since the culvert is hollow, it can be used as a material carrying path to the excavation tip during tunnel construction, or a wiring path, drainage path, or inspection or emergency path during tunnel operation. it can.

  In the pedestal member installation step S20 of the present embodiment, the invert portion (horizontal plane) is constructed by the invert construction step S10, and then the pedestal member 14 is installed on the invert portion. When it is formed so that the base member 14 can be placed directly, the invert construction step S10 may be omitted.

  Further, the pedestal member 14 is not limited to the culvert, but may be any member that has an upper surface with a predetermined width at a predetermined height and has a strength to support the weight of a construction vehicle or the like that passes therethrough.

  Further, in the backfilling step S30 of the present embodiment, the crushed stone 24 and the fluidized soil 28 are used as the backfill material, but the excavated soil generated when the tunnel 10 is excavated as the raw material of the fluidized soil 28. May be used. Further, not limited to the fluidized soil 28, a material obtained by mixing excavated soil with a solidifying material for solidifying the excavated soil (for example, cement) or a material obtained by dewatering the excavated soil may be used. If it does in this way, not only the effort which carries out excavation soil out of the tunnel 10 can be reduced, but the cost of the material which constructs the roadbed part 32, and the effort which carries in a material can also be reduced. In this case, if the crushed stone 24 is included in the excavated soil, the crushed stone 24 separately laid on the bottom and the surface of the above-described roadbed portion 32 may not be used.

  Moreover, although the description of the method for constructing the road bed portion of the present embodiment is construction in a shield tunnel, it may be applied to a mountain tunnel. Of course, the tunnel cross section is not limited to a circle but may be an oval or a rectangle. In addition, when the tunnel cross section is a rectangle, the invert block 12 which has a planar lower surface according to the bottom face shape is used.

It is process drawing which shows the process of constructing a roadbed part in the tunnel which concerns on this embodiment. It is a figure for demonstrating the detail of the invert construction process S10 and the base member installation process S20. It is a figure for demonstrating the detail of the backfill process S30.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Tunnel 12 Invert block 13 Segment 14 Base member 16 Material transport crane 18 Freight car 20 Track 22 Rail land vehicle 24 Crushed stone 26 Vibrating roller 28 Fluidization processing soil 30 Placing pipe 32 Roadbed S10 Invert construction process S20 Base member installation process S30 Filling Return process

Claims (9)

A method for constructing a road bed in a tunnel,
A pedestal member installation step in which a pedestal member having an upper surface with a predetermined height at a predetermined height is continuously installed in the tunnel axial direction so that the upper surface is substantially horizontal at the bottom center in the tunnel;
A backfilling step in which a backfilling material is laid back in the space at the bottom of the tunnel on both sides of the pedestal member installed continuously;
A construction method of a road bed portion in a tunnel, wherein the upper surface of the base member that is continuously installed is used as a passage for moving the road bed section being constructed. Before the pedestal member installation step, including a horizontal portion forming step of continuously installing a structure having a substantially horizontal portion on the upper surface on the inner peripheral bottom surface of the tunnel in the tunnel axis direction,
2. The tunnel according to claim 1, wherein, in the pedestal member installation step, the pedestal member is continuously installed in the tunnel axis direction on the upper surface of the structure formed in the horizontal portion formation step. How to build the roadbed.   The tunnel according to claim 2, wherein the structure is constructed by laying a laying material having a substantially planar upper surface and a lower surface having a shape corresponding to the inner peripheral bottom surface of the tunnel. How to build the inner road floor.   4. The method for constructing a tunnel inner floor according to claim 3, wherein an invert block is used as the laying material. Laying a track in the passage, installing a wagon that moves on the track,
The method for constructing a tunnel floor in a tunnel according to any one of claims 1 to 4, wherein the freight car is used as a transport means for transporting materials and waste materials.   The method for constructing a tunnel inner floor according to any one of claims 1 to 5, wherein crushed stone and fluidized soil are used as the backfill material.   As at least a part of the backfilling material, a material obtained by mixing the excavated soil generated when excavating the tunnel with a solidified material for solidifying the excavated soil, or a material obtained by dehydrating the excavated soil is used. The construction method of a tunnel floor in a tunnel according to any one of claims 1 to 5. A roadbed built in a tunnel,
In the center of the bottom of the tunnel, a pedestal member having an upper surface with a predetermined width at a predetermined height is continuously installed in the tunnel axis direction so that the upper surface becomes a substantially horizontal plane,
A roadbed portion in a tunnel, wherein a backfill material is laid in the space at the bottom of the tunnel on both sides of the base member that is continuously installed.   The road bed in a tunnel according to claim 8, wherein the pedestal member is a culvert.

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