JP4839347B2 - Structure of lining body and construction method thereof - Google Patents

Description

  The present invention relates to a structure of a lining body constructed in a curved portion of a tunnel and a construction method thereof.

  In general, when constructing a lining body in a curved part of a tunnel excavated by a shield machine, first, a steel segment is laid in an annular shape inside the tunnel, and a mold is formed with a predetermined interval inside. Install a frame. Next, the concrete is pumped between the steel segment and the formwork, and when the concrete is hardened, the formwork is removed. Finally, a coating material is applied to the inner peripheral surface of the hardened concrete layer, that is, the surface in contact with the mold.

However, the above-described lining body construction method has the following problems.
(1) Concavities and convexities are formed on the inner peripheral surface of the concrete layer by an air reservoir generated when the concrete is filled. Even if a coating material is applied to the inner peripheral surface, the unevenness cannot be eliminated and remains as it is, and the finished surface is not good in appearance.
(2) When a large number of air reservoirs are formed in the concrete layer, the strength of the concrete layer determined by design or the like may not be ensured.

  Therefore, the present invention has been made in view of the above-mentioned problems, and its purpose is to provide a lining body having a good finished surface appearance and strength determined by design or the like and a construction method thereof. provide.

  In order to achieve the above object, the structure of the lining body of the present invention is a structure of a lining body constructed in a curved portion of a tunnel, and a steel segment laid in an annular shape in the curved portion in the tunnel, A first mortar portion provided in an annular shape inside the steel segment and an inner peripheral surface of each connection portion connecting the steel segments in the axial direction of the tunnel are in contact with the inner peripheral surface of the first mortar portion. An expandable joint portion provided in the manner described above, a second mortar portion provided between the joint portions adjacent to each other in the axial direction of the tunnel, and inside the first mortar portion, and the second mortar portion And a fiber net disposed at a predetermined depth from the inner peripheral surface of the mortar part (first invention).

According to the structure of the lining body according to the present invention, since the mortar is excellent in adhesion to the steel segment, the lining body can be constructed without using a formwork. And since the 1st and 2nd mortar part is constructed without using a formwork, generation | occurrence | production of an air pool can be prevented. In addition, since there is no air accumulation in the first and second mortar parts, the first and second mortar parts can ensure predetermined strengths determined by design or the like.
Moreover, since the structure of the lining body by this invention is provided in a curved part, an excessive compressive force and tensile force may act on a lining body by the deformation | transformation of a natural ground by an earthquake etc. However, since the joint portion is provided between the second mortar portions adjacent to each other in the axial direction of the tunnel, they can be absorbed.

In a second aspect based on the first aspect, the joint portion covers an annular elastic body provided so as to be in contact with an inner peripheral surface of the first mortar portion, and an inner peripheral surface of the elastic body. And a caulking unit provided.
According to the structure of the lining body according to the present invention, since the caulking portion that covers the outer periphery of the elastic body is provided, it is possible to prevent moisture from entering the elastic body.

  The method for constructing a lining body according to a third aspect of the present invention is a method for constructing a lining body for constructing a lining body in a curved portion of a tunnel. The first mortar part installation step of providing an annular first mortar part inside the steel segment, and the inside of each connection part connecting the steel segments in the axial direction of the tunnel, the first A joint portion installation step for attaching a joint portion that can be expanded and contracted so as to be in contact with the inner peripheral surface of the mortar portion, and between the joint portions adjacent to each other in the axial direction of the tunnel and inside the first mortar portion. A second mortar portion installation step for providing a second mortar portion; and a fiber net attachment step for disposing a fiber net at a predetermined depth from the inner peripheral surface of the second mortar portion.

According to the construction method of the lining body according to the present invention, since the first and second mortar parts are constructed without using a formwork, it is possible to prevent the occurrence of air accumulation. And since there is no air accumulation in the 1st and 2nd mortar parts, the 1st and 2nd mortar parts can ensure predetermined intensity determined by design etc.
Moreover, even if an excessive compressive force or tensile force acts on the lining body due to deformation of the natural ground due to an earthquake or the like, it can be absorbed by the joint portion.

According to a fourth invention, in the third invention, the first mortar part laying operation in the first mortar part installation step, the joint part attaching operation in the joint part installation step, and the second mortar part installation step, In the mortar part installation step, the second mortar part is laid manually.
According to the construction method of a lining body according to the present invention, the first mortar part and the second mortar part are constructed manually, so that the finished surface can be formed with good appearance.
Further, since the joint portion is manually installed, it can be reliably installed at a predetermined position.

  By using the structure and construction method of the lining body of the present invention, it is possible to provide a finished surface with good appearance and strength determined by design or the like.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows a state in which a tunnel having a sharp curve portion according to the present embodiment is excavated by a shield machine, and FIG. 2 shows a sharp curve portion of the tunnel to which the structure of the lining body according to the present embodiment is applied. It is a longitudinal cross-sectional view. 3 and 4 are a cross-sectional view taken along line AA and a line BB in FIG. 2, respectively.

  As shown in FIGS. 1 to 4, the lining body 1 is provided in a ring shape in a steel segment 4 that is laid in an annular shape on a sharply curved portion 3 having a small curvature radius in a tunnel 2, and is provided in a ring shape inside the steel segment 4. The first mortar part 5 is provided.

The 1st mortar part 5 is provided so that the rib 4a, the joint board 4b, and the main girder 4c of the steel segment 4 may be covered completely while contacting the inner peripheral surface of the steel segment 4. The compressive strength of the first mortar part 5 is, for example, 21 N / mm ² .

  A joint portion 6 is provided on the inner side of each connection portion 4 in which the steel segments 4 are connected to each other in the axial direction of the tunnel 2 so as to contact the inner peripheral surface of the first mortar portion 5.

  The joint portion 6 is in contact with the inner peripheral surface of the first mortar portion 5, covers the outer periphery of the annular elastic body 7 and the elastic body 7, and caulking prevents moisture from entering the elastic body 7. Part 8. In the present embodiment, foamed polyethylene is used as the elastic body 7, but the material is not limited to this material, and any material that can expand and contract and does not chemically react with the mortar may be used. In the present embodiment, the caulking portion 8 is formed by applying denatured silicon, but is not limited to this material, and may be formed of a waterproof material.

  A second mortar portion 9 is provided between the joint portions 6 adjacent to each other in the axial direction of the tunnel 2 so as to be in contact with the inner peripheral surface of the first mortar portion 5.

The second mortar portion 9 is composed of two annular mortar layers having different compressive strengths. Specifically, the outer mortar layer 10 is provided so as to be in contact with the inner peripheral surface of the first mortar part 5, and has the same compressive strength as the first mortar part 5, and is provided inside the outer mortar layer 10. The inner mortar layer 11 has a compressive strength larger than that of the first mortar portion 5. Compressive strength of the outer mortar layer 10, inner mortar layer 11, respectively, for ^example, 21N / mm 2, 45N / mm 2. In the present embodiment, the outer mortar layer 10 is constructed so as to have the same compressive strength as that of the first mortar part 5, but the present invention is not limited to this, and the outer mortar layer 10 is formed of the first mortar part 5. The outer mortar layer 10 may be constructed to be equal to the inner mortar layer 11 having a compressive strength of 45 N / mm ² .

In addition, the compressive strength of the 1st mortar part 5, the outer side mortar layer 10, and the inner side mortar layer 11 is a value which changes with each field, and is each determined by design etc.
A fiber net 12 mainly composed of glass is disposed at a predetermined depth from the inner peripheral surface of the inner mortar layer 11.

  And the coating | coated part 13 for waterproofing and curing is provided so that the internal peripheral surface of the 2nd mortar part 9 may be covered. The inner peripheral surface of the covering portion 13 is aligned with the inner peripheral surface of the caulking portion 8 and is formed to be the same surface without a step.

According to the structure of the lining body 1 of the present embodiment configured as described above, even if an excessive compressive force or tensile force acts on the lining body 1 due to deformation of the ground due to an earthquake or the like, the tunnel 2 Since the joint part 6 is provided between the mortar parts adjacent to an axial direction, those compressive forces and tensile forces can be absorbed.
Further, since the joint portion 6 includes the caulking portion 8 that covers the outer periphery of the elastic body 7, moisture can be prevented from entering the elastic body 7.

5-9 is a figure which shows the construction procedure of the covering body 1 which concerns on this embodiment.
First, as shown in FIG. 5, a steel segment 4 is installed in an annular shape on the sharply curved portion 3 in the tunnel 2. The mortar is manually filled inside the steel segment 4 to construct an annular first mortar portion 5.

For the first mortar portion 5, a mortar having excellent adhesion is used so as not to adhere to the inner peripheral surface of the steel segment 4 and fall. In the present embodiment, for example, a mortar having a property of 1.5 N / mm ² (for example, LCC mortar T-150 (trade name): manufactured by Fujikawa Construction Materials Co., Ltd.) was used in the standard adhesion test. However, it is not limited to this value, and is changed as appropriate according to the field conditions.

  Next, as shown in FIG. 6, an annular foamed polyethylene is manually attached to the inner peripheral surface of the first mortar portion 5 and inside the connection portion 4 d between the steel segments 4. The foamed polyethylene is bonded to the inner peripheral surface of the first mortar portion 5 with an adhesive.

  Then, as shown in FIG. 7, between the joint portions 6 adjacent to each other in the axial direction of the tunnel 2 and inside the first mortar portion 5, the mortar is manually filled, and the annular outer mortar layer 10 is formed. To construct. In the present embodiment, the blending ratio of sand, cement, and water when constructing the first mortar part 5 so that the compressive strength of the first mortar part 5 and the compressive strength of the outer mortar layer 10 are the same. The outer mortar layer 10 is constructed as it is.

  Next, as shown in FIG. 8, the inside of the outer mortar layer 10 is manually filled with mortar whose blending ratio such as sand is adjusted so as to be higher than the compressive strength of the outer mortar layer 10. An inner mortar layer 11 is constructed. In the present embodiment, a high-strength mortar (for example, LCC mortar T-180P (trade name): manufactured by Fujikawa Construction Materials Co., Ltd.) was used for the inner mortar layer 11.

  When the inner mortar layer 11 is constructed up to the position where the fiber net 12 determined in advance by design or the like is installed, the inner peripheral surface is finished smoothly so that the fiber net 12 can be easily attached. And the fiber net 12 is attached to the inner peripheral surface. Further, a high-strength mortar is filled so as to cover the fiber net 12, and the annular inner mortar layer 11 is constructed.

  Finally, as shown in FIG. 9, a coating curing material is applied to the inner peripheral surface of the inner mortar layer 11 to construct the coating portion 13, and deformed silicon is applied so as to cover the foamed polyethylene so that the caulking portion 8 is formed. To construct.

  As described above, according to the construction method of the structure of the covering body 1 of the present embodiment, since the covering body 1 is constructed manually without using a formwork, it is possible to prevent the occurrence of air accumulation. . And since an air pool does not generate | occur | produce, the 1st and 2nd mortar part 9 provided with the predetermined intensity | strength determined by the design etc. can be constructed | assembled.

Moreover, since the 1st mortar part 5 and the 2nd mortar part 9 are constructed | assembled manually, a finished surface can be formed with good appearance.
Furthermore, since the joint portion 6 is manually installed, it can be reliably installed at a predetermined position.

It is a longitudinal cross-sectional view of the sharp curve part of the tunnel to which the structure of the lining body which concerns on this embodiment is applied. It is a longitudinal cross-sectional view of the sharp curve part of the tunnel to which the structure of the lining body which concerns on this embodiment is applied. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is a figure which shows the construction procedure of the lining body which concerns on this embodiment. It is a figure which shows the construction procedure of the lining body which concerns on this embodiment. It is a figure which shows the construction procedure of the lining body which concerns on this embodiment. It is a figure which shows the construction procedure of the lining body which concerns on this embodiment. It is a figure which shows the construction procedure of the lining body which concerns on this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Covering body 2 Tunnel 3 Steep curve part 4 Steel segment 4a Rib 4b Joint board 4c Main girder 4d Connection part 5 First mortar part 6 Joint part 7 Elastic body 8 Caulking part 9 Second mortar part 10 Outer mortar layer 11 Inner mortar layer 12 Fiber net 13 Covering part

Claims (4)

It is the structure of the lining body constructed in the curved part of the tunnel,
A steel segment laid in an annular shape in the curved part of the tunnel;
A first mortar portion provided in an annular shape inside the steel segment;
Stretchable joints provided so as to be in contact with the inner peripheral surface of the first mortar part inside each connection part that connects the steel segments in the axial direction of the tunnel,
A second mortar portion provided annularly between the joint portions adjacent in the axial direction of the tunnel and inside the first mortar portion;
A structure of a lining body comprising: a fiber net disposed at a predetermined depth from an inner peripheral surface of the second mortar part. The joint part is
An annular elastic body provided in contact with the inner peripheral surface of the first mortar part;
The structure of the lining body according to claim 1, comprising a caulking portion provided so as to cover an inner peripheral surface of the elastic body. In the construction method of the lining body that constructs the lining body in the curved part of the tunnel,
A segment installation step of laying steel segments in a circular shape in the curved part of the tunnel;
A first mortar part installation step of providing an annular first mortar part inside the steel segment;
A joint part installation step of attaching a joint part that can be expanded and contracted so as to contact the inner peripheral surface of the first mortar part, inside each connection part that connects the steel segments in the axial direction of the tunnel,
A second mortar part installation step in which an annular second mortar part is provided between the joint parts adjacent to each other in the axial direction of the tunnel and inside the first mortar part;
A method for constructing a lining body, comprising: a fiber net attaching step of arranging a fiber net at a predetermined depth from an inner peripheral surface of the second mortar part.   The laying operation of the first mortar part in the first mortar part installation step, the attachment work of the joint part in the joint part installation process, and the second mortar part in the second mortar part installation process 4. The method for constructing a lining body according to claim 3, wherein the laying work is performed manually.

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