JP2000145390A - Invert-forming method and block in existing mountain tunnel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for installing an invert in the batholith of an existing mountain tunnel without interrupting general traffic in a short period of time. SOLUTION: In order to form an invert in the ground under pavement that regulates a road surface in an existing mountain tunnel 10, on both sides of one and the other one side part of the road surface, the formation of a groove 66 intersecting the part, the formation of a half invert 22 by arranging a plurality of blocks 38, 40, 42, 68, 70, 72 in the groove, and the back filling operation of the groove and pavement to the back filled surface are executed successively. One of blocks disposed in the groove formed in advance has a raised part, and the raised part works to prevent not only the ground from collapsing at the other one side part, but also a back filling material of the groove formed in advance from collapsing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming an invert in a bottom of an existing mountain tunnel and a block used for the method.

[0002]

2. Description of the Related Art When an existing mountain tunnel that is used for general traffic is swelled, the place where the swelling occurs or the vicinity thereof is sunk in order to reinforce the bottom of the mountain tunnel. Is cut in the entire width direction of the mountain tunnel, and inverts are formed on the cut marks at both ends of both sides of the lining of the mountain tunnel.

[0003] However, this method has a problem in that general traffic must be cut off in the mountain tunnel.

[0004] As a method of solving this problem, an invert formation operation is performed on one side of the road surface in the mountain tunnel while the other is used for general traffic. It is conceivable that the invert forming operation is completed in the one side while the completed one side is used for general traffic.

[0005] This method is advantageous in that it is possible to avoid one-sided traffic by securing one-sided traffic, but on the other hand, it involves restrictions on the traffic of general traffic, so that the time required for forming the invert can be shortened. desirable.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for installing an invert in the bottom of an existing mountain tunnel in a short time without interrupting general traffic.

[0007]

SUMMARY OF THE INVENTION The present invention is a method for forming an invert in a ground under a pavement defining a road surface in an existing mountain tunnel, the invert being traversed on one side of the road surface. Forming a first groove, arranging a plurality of blocks including one block having a rising portion in the first groove, whereby the rising portion of the one block uses the other as a retaining means; Supporting one side of the ground and forming half of the invert,
Backfilling the first groove and paving the backfilled surface, and then supporting the backfill material at the rising portion of the one block on the other side of the road surface; Forming a second transverse groove, arranging a plurality of blocks in the second groove, thereby forming the other half of the invert, backfilling and backfilling the second groove; Including paving the subsequent surface.
Each groove preferably has a bottom surface consisting of a curved surface that substantially matches the curved surface of the bottom surface of the half of the invert to be formed.

Further, the present invention is a block used in the method of forming the invert, wherein the main body extends in the direction in which the first groove extends, and a rising portion connected to the main body, which cooperates with the main body. And a plate-shaped rising portion having one surface for supporting the ground of the other one side portion.
The block is further provided on the rising portion and forms a part of one surface thereof, a semi-cylindrical surface for receiving a part of a drainage pipe to be installed, and the rising portion penetrates from one surface to another surface and And a hole opened in the semi-cylindrical surface.

[0009]

According to the present invention, a groove is formed on one side of a road surface in a tunnel in order to cross the one side, and a half of an inversion by arranging a plurality of blocks in the groove. Since the steps of forming, backfilling the groove, and pavement are performed, during formation of the invert, general traffic alternates between one of the one side portions of the road surface and the other one side portion after the pavement. It can be used for In addition, by making the bottom surface of each groove and the block a curved surface substantially matching the curved surface of the bottom surface of the half of the invert to be formed, the time required for forming each half of the invert by disposing the block in the groove is reduced. It can be shorter.

In the present invention, since the ground is firstly supported or soil-retained at a portion provided for one-sided traffic using a block forming a part of the invert, it is generally performed. The time and labor required for installing and removing the earth retaining plate can be reduced. For this reason, the time for one-way traffic during the formation of the invert can be reduced.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, an existing mountain tunnel for general traffic, to which the present invention is applied, is indicated by the reference numeral 10 as a whole.

The mountain tunnel (hereinafter abbreviated as “tunnel”) 10 has a lining 12 and a pavement 14 having a horseshoe-shaped cross section that define a space for traffic for people and vehicles. The pavement 14 that defines the road surface includes an asphalt pavement, a concrete pavement, and the like provided on the subgrade 16.

In the tunnel 10 in operation, a swelling (not shown) may occur at one or a plurality of locations on the bottom 20 including the pavement 14, the subgrade 16, and the ground 18 under the subgrade. Invert 22 in ground 18 for repair
(See FIG. 4) is formed.

The invert 22 has an overall shape convexly curved downward, and is in contact with lower ends 26 of both sides 24 of the lining 12 at both ends in the circumferential direction.

In order to form the invert 22, a groove (first groove) 30 crossing the one side portion 28 on the road surface is first formed (FIG. 2). The groove 30 is preferably formed on the bottom surface 32 (FIG. 4) of the invert 22 to be formed.
(A half in the longitudinal direction of the groove 30).

The groove 30 is formed on the bottom 14 (paving 14, the roadbed 16 and the ground 1) by using a trencher, a rock drill, a backhoe or the like at or near the place where the bulging occurs.
8) can be formed by digging down. At this time, one of the side grooves 36 in the bottom plate 14 is removed without crushing or crushing. By forming the groove 30,
A part of the lower end 26 of both sides 24 of the lining 12 is exposed.

Next, a plurality of blocks 38, 4 are provided in the groove 30.
0 and 42 are arranged in series (FIGS. 2 and 3).

Each of these blocks 38, 40, 42 has a bottom surface having a curved surface on the bottom surface of the half of the invert 22, and thus a curved surface substantially matching the curved surface of the bottom surface 34 of the groove 30. The sum of the in-series lengths of the bottom surfaces of 42 is approximately equal to the length dimension of the bottom surface 34 of the groove 30. Each block has the same width dimension a (FIG. 5) as the width dimension of the groove 30 (length in the axial direction of the tunnel), for example, 50 to 100 cm.

The groove 30 and the blocks 38, 40, 42
May be such that the curved surfaces of these bottom surfaces do not coincide with the curved surfaces of the half bottom surface of the invert 22.
As shown in the illustrated example, the half of the invert 22 can be formed easily and in a short time only by arranging the blocks 30, 40, and 42 in the groove 30.

At this time, the block 38 located at one end of the groove 30 is used to remove a portion of the ground that defines one end of the groove, that is, a part of the other one side portion 45 of the road surface, which is generated by excavation of the groove 30. In contact with the vertical surface 44 of the ground 18 to be formed,
A block 42 located at the other end of the groove 30 contacts the lower end 26 on one side of the lining.

The block 38 has the same thickness as that of the block 40 and has the same thickness as the block 40, whereas the other two blocks 40 and 42 are made of plate-like bodies having the same thickness. And a plate-shaped rising portion 48 connected to the main body.

The main body 46 of the block 38 and the rising portion 4
8 has a flat surface 50 defined in cooperation with each other, and the rising portion 48 has a flat other surface 52 facing the one surface 50. The block 38 is in contact with the vertical surface 44 of the ground on one side 50 thereof. For this reason, the block 38 performs a retaining action on the vertical surface 44 of the ground 18 to support the same. Thereby, the vertical surface 44
Can be prevented from collapsing. Therefore, it is desirable to arrange the blocks 40 and 42 sequentially in the groove 30 after the block 38 is arranged. Since the block 38 forming a part of the invert is used as the retaining means for the vertical surface 44, the labor and time for separately constructing the retaining wall can be eliminated, thereby reducing the time required for forming the invert 22. be able to.

Prior to the arrangement of the blocks 38, 40 and 42, a mortar (not shown) is laid on the bottom surface 34 of the groove.
The gap between the blocks 38, 40 and 42 and the block 4
2 and the gap between the lower ends 26 of the lining are filled with concrete (not shown). This adjusts the slight unevenness of the groove bottom surface 34 and also blocks 38, 40, 42
The blocks 42 and the lower end 26 of the lining may be connected together to make them integral.

The rising portion 48 of the block 38 is provided with a semi-cylindrical surface 54 and one hole 56. The semi-cylindrical surface 54 is open to one surface 50 and extends in the width direction (axial direction of the tunnel) in the vicinity of the main body 46. Hole 5
6 has a semi-cylindrical surface 54 and another surface 52 at both ends, respectively.
And open to the public. Instead of one hole 56, a plurality of holes can be arranged at intervals in the width direction.

The semi-cylindrical surface 54 holds a perforated tube 58 (FIG. 4) which is subsequently positioned to receive and drain groundwater, and a hole 56 directs surrounding groundwater to the perforated tube 58. Lead.

After forming a part of the invert, earth and sand, crushed stones (backfilling material) 60 are put on the main body 46 of the block 38 and the blocks 40 and 42. As a result, the groove 30 is buried back to the height position of the top surface of the ground at the other side portion 45 of the road surface, that is, the height position of the top surface of the rising portion 48 of the block 38.

Thereafter, a subgrade 62 made of, for example, crushed stone is formed on the top surface of the backfill material 60, and a pavement 64 made of asphalt pavement or concrete pavement is formed on the subgrade 62.
Is applied.

Until the construction of the pavement 64 is completed, the other side portion 45 can be used for general traffic, so that the entire traffic in the tunnel 10 can be avoided.

Next, the other half of the invert 22 is formed. The formation of the other half of the invert 22 is performed in substantially the same manner as the above-described formation of the half of the invert 22.

That is, a groove 66 crossing the other side portion 45 is formed (FIG. 3), a plurality of other blocks 68, 70, 72 are arranged in the groove 66, and then the groove 66 is filled with backfill material. A backfill is formed at 74, a subgrade 76 is formed on the surface of the backfill material 74, and a pavement 78 is provided on the subgrade 76. During this time, one of the repaired one side portions 28 is used for general traffic. As a result, throughout the repair period,
The traffic in the tunnel 10 is maintained.

The groove 66 is continuous with the previously formed groove 30 and has the same width as the groove 30. For the same reason as described above, the groove 66 is formed on the bottom surface 8 of a curved surface substantially matching the curved surface of the bottom surface of the other half of the invert 22.
Has zero. The groove 66 can be excavated in the same manner as the groove 34.

Each of the plurality of blocks 68, 70, and 72 is formed of a plate-like body, and has a curved surface substantially matching the curved surface of the bottom surface 80 of the groove 66 for the same reason as described above. These blocks 68, 70, 72 are formed by
6 are in contact with each other when arranged in series, and one block 68 is the body 4 of the previously arranged block 38.
6 and the lower end 26 of the other side of the other block lining. Therefore, these blocks 68,7
0,72 cooperate to form the other half of the invert 22.

Similarly, prior to the arrangement of the blocks 68, 70, 72, mortar (not shown) is laid on the bottom surface 80 of the groove, and the gap between these blocks, the block 68 and the body 46 of the block are formed. Gaps between, and
The gap between the block 72 and the other lower end 26 of the lining is filled with concrete (not shown).

Similarly, the backfilling of the groove 66 is performed up to the top surface of the rising portion 48 of the block 38 arranged earlier.
The formation of the subgrade 76 and the pavement 78 on the backfill material 66 is performed in the same manner as described above, thereby completing the formation of the invert 22.

Prior to backfilling with the backfill material 66, a perforated pipe 58 is passed through the semi-cylindrical surface 54 of the block 38 disposed earlier, and both ends of the perforated pipe are respectively connected to the existing drain pipe (see FIG. (Not shown).

Between the excavation of the groove 66 in the other side portion 45 and the backfilling of the groove, the backfill material 60 in the groove 30 previously filled is filled with the rising portion 4 of the block 30.
7 prevents the collapse.

Each of the above-mentioned blocks is made of, for example, steel, other than the precast concrete one shown in the figure.
Those made of FRP or the like can be used. Also, blocks 38, 40, 42 and blocks 68, 70, 72
Can be 2 or 4 or more, respectively, instead of the illustrated example in which these quantities are 3.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view of an existing mountain tunnel to which the present invention is applied.

FIG. 2 is a cross-sectional view similar to FIG. 1 in a state where a groove is excavated on one side portion and one block is arranged in the groove.

FIG. 3 is a cross-sectional view similar to FIG. 1 in a state where a groove is excavated in the other one side portion.

FIG. 4 is a cross-sectional view similar to FIG. 1 in a state where an invert is formed.

FIG. 5 is an enlarged rear view of one block.

[Explanation of symbols]

10 Existing mountain tunnel 14 Pavement 18 Ground 28,45 One side part and the other side part of road surface 30,66 Groove 32 Bottom of invert 34,80 Bottom of groove 38,46,48 Block, its main body and rising portion 40 , 42,68,70,72 blocks

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Akira Nishimaki 2-1 Tsukudo-cho, Shinjuku-ku, Tokyo Kumagaya Gumi Tokyo Head Office (72) Inventor Yoshihiro Yasukawa 2-1 Tsukudo-cho, Shinjuku-ku, Tokyo Kumagai Gumi Tokyo Main Office (72) Inventor Mitsuo Masuda 2-1 Tsukudo-cho, Shinjuku-ku, Tokyo F-term (reference) 2D055 BB02 CA08 KB04 KB13 LA03 LA16

Claims (4)

[Claims] 1. A method for forming an invert in a ground under a pavement defining a road surface in an existing mountain tunnel, comprising: forming a first groove crossing one side of the road surface on one side portion thereof. Having a rising portion in the first groove.
Arranging a plurality of blocks including the block of the above, thereby supporting the ground of the other side portion at the rising portion of the one block and forming half of the invert, backfilling the first groove, Paving the backfilled surface, and then forming a second groove across the other side of the road surface while supporting the backfill material at the rise of the one block. That a plurality of blocks are arranged in the second groove,
Forming the other half of the invert, the second
A method of forming an invert, comprising backfilling the groove of the above and paving the backfilled surface. 2. The method according to claim 1, wherein each groove and said block have a bottom surface consisting of a curved surface that substantially matches the curved surface of the bottom surface of the half of the invert to be formed. 3. A block used in the method according to claim 1 or 2, wherein the main body extends in a direction in which the first groove extends, and a rising portion connected to the main body and cooperates with the main body. A plate-shaped rising portion having one surface for supporting the ground of the other one side portion. 4. A semi-cylindrical surface provided on the rising portion and forming a part of one surface thereof for receiving a part of a drainage pipe to be installed, wherein the rising portion penetrates from one surface to another surface and Having a hole opened in the semi-cylindrical surface,
The block according to claim 3.