JP2001280059A - Widening method and repairing method for tunnel, and protector used therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a widening method and a repairing method for an existing mountain tunnel capable of sufficiently ensuring both a passage and a space necessary for a work within the tunnel, and a protector used therefor. SOLUTION: A plurality of protectors 32 extending the axial direction of the existing mountain tunnel 10 is arranged in the tunnel 10 to provide a passage part 36 regulated by the bottom slab part 34 of the tunnel, a part of an existing lining 16 and the protector. Thereafter, the other part of the existing lining and the natural ground around it are successively removed, and a lining 56 connected to the part of the existing lining is newly provided in the removed part. The protector comprises a horizontal plate part 36 supported by the part of the existing lining 16 and a vertical plate part 38 supported on the floor slab part 34.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for widening an existing mountain tunnel, a method for repairing an existing mountain tunnel, and a protector used for the method.

[0002]

2. Description of the Related Art In order to widen or repair (including rehabilitation) a narrow existing mountain tunnel, other parts are destroyed and removed, except for a part including the side of an existing lining of the tunnel, and further removed. The surrounding ground is excavated and removed, and thereafter, at these removal marks, a new lining connected to a part of the existing lining is provided.

Conventionally, when widening or repairing a tunnel, a protector extending in the axial direction of the existing mountain tunnel is disposed on a bottom plate portion of the existing mountain tunnel. There was a passage for vehicles.

However, the protector is composed of a top plate and a pair of side plates facing each other and connected to the top plate. When the protector is disposed in the tunnel having a circular cross section, the protector is not provided. There is a dead space between the surroundings, especially one of the side plates and the side of the existing lining, so that a traffic path for pedestrians and general vehicles can be secured. There is a problem that the working space required for the operation of the construction machine and the entry of the construction vehicle is small between the sides and the work space, and in some cases, this space cannot be secured.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for widening an existing mountain tunnel capable of securing both a traffic path and a sufficient space for work in the tunnel, a method for repairing the same, and a protector used for these methods. To provide.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a method for widening the entire length of an existing mountain tunnel or repairing (including renovating) the entire length or a portion thereof.
One or more protectors extending in the axial direction are arranged in a part of the existing mountain tunnel with respect to the axial direction, whereby a bottom plate portion of the mountain tunnel and a portion including a side of an existing lining of the mountain tunnel; Providing a traffic path defined by the protector, and then sequentially removing other portions except for a portion of the existing lining and ground around the other portion, and removing the existing lining at these removal marks. Includes the construction of a new lining connected to a portion of the work.

[0007] The protector has a horizontal plate portion supported by a part of the existing lining, and a vertical plate portion connected to the horizontal plate portion and supported on the bottom plate portion. Things. Prior to the arrangement of the protector, one or more brackets for supporting the horizontal plate portion of the protector can be attached to a part of the existing lining.

[0008] The protector used in each of the widening method and the repair method further includes a plurality of wheels each having the protector attached to a horizontal plate portion and a vertical plate portion thereof, and the wheels are respectively mounted on the bracket. And rolling on a plurality of rails respectively mounted on the bottom slab of the tunnel and extending horizontally in the transverse direction of the tunnel.

Each of the plurality of protectors includes a second plurality of wheels mounted on the horizontal plate portion and a plurality of rails extending on the horizontal plate portion in the longitudinal direction thereof. The wheels may be able to roll on said rails of another protector.

[0010]

According to the present invention, one or more protectors extending in the axial direction are arranged in a part of the existing mountain tunnel in the axial direction, whereby the bottom plate portion of the mountain tunnel and the mountain Since a traffic path defined by a part including the side of the tunnel and the protector is provided and a part of the existing lining is used, no dead space is generated between the part and the protector.

[0011] Therefore, a traffic path for pedestrians and general vehicles is secured between the protector and a part of the existing lining, and between the protector and another part of the existing lining. It is possible to sufficiently secure a work space necessary for operation of machines used for tunnel widening work or repair work thereof and entry of a work vehicle.

The above protector is optimally of an L-shaped cross-sectional shape having a horizontal plate portion and a vertical plate portion connected to the protector in order to secure the traffic path and the working space and to handle the protector. It can be said.

[0013] The horizontal plate portion and the vertical plate portion can be supported on a part of the existing lining and a bottom plate portion of a tunnel, respectively. If one or more brackets are attached to a part of the existing lining in advance, the horizontal plate part of the protector is placed on these brackets to support the horizontal plate part on a part of the existing lining. It can be done easily.

Further, a plurality of wheels are mounted on a horizontal plate of the protector, and a plurality of rails extending horizontally in a transverse direction of the tunnel are mounted on the bracket, and a plurality of wheels are mounted on a vertical plate of the protector. If a plurality of rails extending in the transverse direction are mounted on the bottom plate of the tunnel, each wheel is mounted on each rail, and the protector is rolled on the rail toward a part of the existing lining. Thereby, the protector can be easily moved to the supporting position.

Further, with respect to the plurality of protectors, a second plurality of wheels are mounted on the horizontal plate portion, and a plurality of rails extending in the longitudinal direction are mounted on the horizontal plate portion, respectively. If the wheels are to be able to roll on rails on other protectors, 1
The second wheel of the protector is placed on the rail of another protector, and one protector can be easily moved in the axial direction of the tunnel. Therefore, when the protector is moved from one part of the tunnel to another part in order to further proceed with the widening work of the tunnel or the repair work thereof, and is used for reuse, for example, the rearmost protector may be replaced with the foremost protector. Can easily be moved to the front.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, for widening a tunnel which utilizes a portion of an existing mountain tunnel 10 to convert the tunnel to one having a larger cross-sectional area.
Or, for repair (including renovation) of the tunnel,
First, the existing lining 12 that defines the internal space of the tunnel 10
The part 16 including the side part 14 is reinforced.

The illustrated existing lining 12 has a horseshoe-shaped cross section as a whole.

The part 16 of the existing lining preferably comprises a side part 14 and a part 18 of an arch part connected thereto, and has a circumferential length of less than half of the entire length of the existing lining 12 when viewed in cross section. Having Part 16 of this existing lining
The boundary between the line and the other part 20 occupying the majority of the existing lining 12 excluding the part is indicated by a chain line 22.

Reinforcement of a part 16 of the existing lining is performed by using a plurality of lock bolts 2 from the part toward the surrounding ground 24.
6 is performed. Reference numeral 28 denotes a plate fixed to the inner wall surface of the portion 16 with a nut (not shown) screwed to the lock bolt 26.

Next, part 16 of the existing lining, tunnel 1
A plurality of brackets 30 are arranged and attached at intervals to each other in the axial direction of the tunnel on a portion 16 of the existing lining that defines a portion (hereinafter, referred to as a “tunnel portion”) in the axial direction of zero.

The above-mentioned tunnel portion is formed by another portion of an existing lining, which will be described later, which is performed for widening or repairing the tunnel.
It has a longer distance than the section of the work relating to the work of removing the ground and its surroundings and the new construction of the lining to these removal traces, said work section being set between both ends of the tunnel portion.

Further, the tunnel portion is changed in accordance with the change of the construction section, that is, the change to the adjacent construction section where the work is newly started with the end of the work in one construction section.

The attachment of the bracket 30 can be performed by, for example, fixing the bracket to the inner wall surface of the portion 16 of the existing lining with an anchor bolt (not shown). Instead of the illustrated example in which a plurality of brackets 30 are installed, one long bracket may be installed.

Next, a plurality of protectors 32 extending in the axial direction of the tunnel are arranged in the tunnel portion (FIG. 2). Instead of using a plurality of protectors 32, one long protector may be used.

By arranging the plurality of protectors 32, a passage 35 defined by the bottom plate portion 34 of the tunnel 10, a part 16 of the existing lining, and the protector 32 can be provided in the tunnel portion.

These protectors 32 protect pedestrians and general vehicles passing through the passage 35 from crushed pieces of the existing lining and excavated pieces of the ground which may be generated and scattered in the construction section. You.

The illustrated protector 32 has an L-shaped cross section as a whole and has a rectangular horizontal plate portion 36 and a rectangular vertical plate portion 38 connected to the horizontal plate portion at a right angle to the horizontal plate portion. .

Each protector 32 has its front end portion mounted on a plurality of brackets 30 so as to be horizontally supported by a part 16 of the existing lining.
Further, the horizontal plate portion 36 is in contact with the inner wall surface of the portion 16 of the existing lining at an end in the transverse direction of the tunnel. On the other hand, the vertical plate portion 38 is supported on the bottom plate portion 34 of the tunnel and extends vertically.

The protector 32 includes, for example, the tunnel 10
The horizontal plate 36 can be placed on the bracket 30 by using a suitable lifting device (not shown) installed in advance in the inside.

According to the protector 32, the width of the horizontal plate 36 of the protector (the length in the transverse direction of the tunnel) and the height of the vertical plate 38 can be arbitrarily set, so that the pedestrian Also, it is possible to secure the width and height of the passage 35 necessary for traffic of general vehicles.

In addition, the protector 32 defines the traffic path 35 in cooperation with the existing lining portion 16, so that the
6 does not create a dead space as in the past,
Further, for this reason, a work space 39 required for introducing and operating the construction machine or vehicle can be secured between the protector 32 and the other portion 20 of the existing lining.

Instead of having the L-shaped cross-sectional shape, the protector may be, for example, a single plate or a curved horizontal or vertical plate. However, since the former protector consisting of a single plate body is used by leaning it on the part 16 at an angle, the traffic path becomes narrower than when the protector 32 shown in the drawing is used, In addition, the latter protector has a drawback in handling in comparison with the illustrated protector 32.

The plurality of protectors 32 can be arranged such that the ends of the two plate portions 36 and 38 in the longitudinal direction (the direction of the axis of the tunnel) abut each other. Further, the protector 32 located at the rearmost position with respect to the progress direction of the construction can be moved and arranged in front of the protector 32 located at the foremost position in accordance with the progress of the construction or the change of the construction section. Thereby, the protector 32 can be reused in the widening work or the repair work over the entire length of the tunnel 10.

Each of the horizontal plate portion 36 and the vertical plate portion 38 of the protector 32 includes two steel plates (not shown) and a plurality of H-shaped steel members (not shown) spaced from each other. And a hollow structure formed by: Instead, it can be formed using an iron plate or a steel plate.

In the illustrated protector 32,
A plurality of wheels 40, 42 are attached to the horizontal plate portion 36 and the vertical plate portion 38, respectively, and a plurality of rails 44, 46 extending horizontally in the transverse direction of the tunnel on the bracket 30 and on the bottom plate portion 34 of the tunnel, respectively. Is attached.

The wheel 40 of the horizontal plate 36 is
At the tip end side of the H-shaped steel plate between the upper and lower two steel plates constituting the horizontal plate portion, is rotatably supported via a rotating shaft (not shown), and is provided with a hole ( (Not shown). However, in the drawings,
In order to avoid the complication of the diagram and the obscuration due to this, including the second wheel 48 described later, the shaft and the hole are omitted and only the wheel is shown by a solid line.

The wheels 40 and 42 are respectively connected to the rails 4
The rails are arranged in a plurality of rows corresponding to the rails so that the rails can be placed on the rails. Therefore, a plurality of wheels 40, 42 in each row are mounted on each rail 44, 46, and the protector 3
2 is pushed toward the inner wall surface of a part of the existing lining, and is rolled on each of the rails 44, 46, so that it can be easily arranged at a predetermined support position.

Further, on the horizontal plate 36 of the protector,
A plurality of second wheels 48 and a plurality of rails 50 are mounted.

In the illustrated example, the second wheels 48 are arranged in two rows at a substantially central portion of the horizontal plate portion 36 at intervals in the width direction of the horizontal plate portion. And protrudes downward from the horizontal plate portion 36.
The plurality of second wheels 48 arranged in each row have their rotation axes (not shown) extending in a direction orthogonal to the rotation axis of the wheels 40.

Two rows of rails 50 spaced apart from each other corresponding to the second wheels 48 are provided on the top surface of the horizontal plate portion 36 and extend in the longitudinal direction thereof in parallel between both ends thereof. .

According to this, the plurality of second wheels 48 in each row of one protector 32 can be mounted on each rail 50 of another protector 32 (this state is shown in FIG. 3).

By placing the second wheel 50 on the rail 50 and pushing the protector 32 in the longitudinal direction to roll on the rail 50, the arrangement position of the protector 32 can be easily changed. For example, in accordance with the progress of the construction, the rearmost protector 32 of the protector row can be easily moved on the protector row so as to be located in front of the foremost protector 32.

After the passage 35 is formed, the other part 20 of the existing lining and the ground 24 (more precisely, a part of the ground 24) around the part are connected to a hydraulic breaker, a backhoe, and a free-section excavator. By crushing and excavating using an excavator such as the above, the other portion 20 of the existing lining and the ground 24 are sequentially removed.

After removing the other portion 20 and the ground 24 of the existing lining, the wall surface defining these removal marks is reinforced. The reinforcement is performed by spraying concrete 54 onto the wall surface and then driving the lock bolt 26 into the wall surface (FIG. 3).

Prior to this reinforcement, the other part of the existing lining 2
The bottom slab 34 is excavated and removed between the side at 0 and the protector 32 (one side lane).

Thereafter, a lining 56 connected to the part 16 of the existing lining is newly provided at the removal mark of the other portion 20 of the existing lining and the ground 24 (FIG. 4). The new lining 56 is
It has a larger radius of curvature than the existing lining 12. However, in the case of repair of the tunnel, the new lining is the existing lining 1
2 has the same curvature deformation. Therefore, in this case, the area in which the other portion 20 of the existing lining and the ground 24 are to be removed is smaller than in the illustrated example.

The new installation of the lining 56 is performed by introducing a centre 58 into the one-side lane and placing concrete between the formwork 60 of the centre 58 and the layer of the reinforced concrete 54.

Prior to the installation of the lining 56, the bottom slab 34 of the one lane is further excavated, and the invert 6 in the bottom slab is formed.
Destroy part 2 and remove it. If necessary,
A part of a new invert 64 is installed at the removal site, and then backfilled with earth and sand 66. The center 58 is placed on the backfill soil 66.

After the lining 56 is newly installed, drainage and pavement of the one lane are performed (FIG. 5). As a result, the one side lane is used for traffic of pedestrians and general vehicles.

Next, after moving all the protectors 32 to the adjacent construction section from the other one lane, the bottom slab 34 in the other one lane is excavated as in the one one lane. Destroy and remove the remainder of the invert 62 in the tunnel 10. After that, the removal site is backfilled with earth and sand, and drainage and paving are performed in the same manner.

Thus, the widening work of the tunnel in the one construction section is completed (FIG. 5).

Subsequently, by applying the present invention to another construction section, it is possible to widen or repair the tunnel over the entire length of the tunnel 10.

The present invention can be applied to repair of one or a plurality of sections in the axial direction of the tunnel, in addition to repair of the entire length of the tunnel.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an existing mountain tunnel with a bracket attached.

FIG. 2 is a cross-sectional view similar to that shown in FIG. 1 with a protector arranged.

FIG. 3 is a cross-sectional view of a tunnel in which a part of an existing mountain tunnel has been removed and the removed trace has been reinforced.

FIG. 4 is a cross-sectional view of the tunnel in a state where a lining is newly provided.

FIG. 5 is a cross-sectional view of a tunnel in which drainage and paving has been performed on one lane after a new lining is installed.

FIG. 6 is a cross-sectional view of a section of the tunnel after the widening work has been completed.

[Explanation of symbols]

10 Existing Mountain Tunnel 12, 16, 20 Lining of Existing Mountain Tunnel, Part and Others 24 Ground 30 Bracket 32 Protector 34 Bottom Plate of Existing Mountain Tunnel 36, 38 Horizontal Plate and Vertical Plate of Protector Part 40, 42, 48 Wheel 44, 46, 50 Rail

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hidemasa Saka 2-1, Tsukudo-cho, Shinjuku-ku, Tokyo Kumagaya Gumi Tokyo Head Office (72) Inventor Haruo Shiiya 1-1-1, Nishihioki, Nakagawa-ku, Nagoya-shi, Aichi Prefecture No. 5 Inside Kumagaya Gumi Nagoya Branch (72) Inventor Tomohiro Kino 1-1-5 Nishihioki, Nakagawa-ku, Nagoya City, Aichi Prefecture Inside Kumagaya Gumi Nagoya Branch

Claims (7)

[Claims] At least one protector extending in the axial direction is arranged in a part of the existing mountain tunnel in the axial direction, whereby a bottom plate portion of the mountain tunnel and a side portion of an existing lining of the mountain tunnel are provided. And providing a passage defined by the protector, and then sequentially removing other parts except the part of the existing lining and ground around the other part, and removing these parts. A method for widening a tunnel, comprising newly installing a lining connected to a part of the existing lining in a trace. 2. An axially extending protector or a plurality of protectors is arranged in a part of an existing mountain tunnel with respect to the axial direction, whereby a bottom plate portion of the mountain tunnel and a side portion of an existing lining of the mountain tunnel are arranged. And providing a passage defined by the protector, and then sequentially removing other parts except the part of the existing lining and ground around the other part, and removing these parts. A method for repairing a tunnel, comprising newly installing a lining connected to a part of the existing lining in a trace. 3. The protector has a horizontal plate portion supported on a part of the existing lining, and a vertical plate portion connected to the horizontal plate portion and supported on the bottom plate portion. The method according to claim 1. 4. The method of claim 3, further comprising, prior to placing the protector, attaching one or more brackets to a portion of the existing lining to support a horizontal plate portion of the protector. 5. The protector used in the method according to claim 1 or 2, wherein the protector comprises a horizontal plate portion supported by a part of the existing lining, and a vertical plate portion connected to the horizontal plate portion. A vertical plate portion supported on the bottom plate portion. 6. The protector further includes a plurality of wheels respectively mounted on the horizontal plate portion and the vertical plate portion, wherein the wheels are respectively mounted on the bracket and a bottom plate portion of the tunnel, respectively. The protector according to claim 5, wherein the protector is capable of rolling on a plurality of rails extending horizontally in a transverse direction of the tunnel. 7. A plurality of protectors each including a second plurality of wheels mounted on the horizontal plate and a plurality of rails extending longitudinally on the horizontal plate.
The protector according to claim 5 or 6, wherein the second wheel of one protector is capable of rolling on the rail of another protector.