JP3549503B2 - Tunnel lining segment and method of manufacturing the same - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a tunnel lining segment laid on an inner peripheral surface of a tunnel and a method for manufacturing the same.
[0002]
[Prior art]
In recent years, for example, in a shield tunnel for roads, a so-called single shell construction method in which a secondary lining is omitted, particularly a construction method in which concrete segments are sequentially assembled on the inner peripheral surface of the tunnel to constitute a lining tends to be adopted. In this case, it is necessary to take a measure for protecting the segment from a tunnel fire (fire-resistant structure). As a measure, for example, there is a method of attaching a fire-resistant plate to the inner surface of the segment.
As a method of attaching the fireproof plate, for example, a so-called retrofitting method has been studied in which a segment is built in a tunnel and then the fireproof plate is attached to the inner surface of the segment with a concrete anchor or the like. However, the retrofitting method as described above has problems such as an increase in construction cost and a construction period, and a decrease in the strength of the segment due to anchoring. Therefore, a so-called pre-installation method for simultaneously assembling a refractory plate onto the inner surface of the segment at the time of manufacturing the segment is being studied.
[0003]
However, when such a segment is adopted for the inner surface of the tunnel, it is necessary to satisfactorily discharge water that inevitably infiltrates the concrete segment due to the water pressure in the ground. In this case, a water guide such as rock wool may be interposed between the fireproof plate and the concrete, but it is difficult to manufacture the segments by the pre-installation method. In particular, when a water guide material such as rock wool is interposed substantially over the entire surface between the concrete segment main body and the fireproof plate, the process of attaching the fireproof plate to the segment main body is very complicated.
[0004]
[Problems to be solved by the invention]
The present invention has been proposed in view of the above problems, and it is possible to satisfactorily integrate a segment body and a fireproof plate, and to apply a tunnel lining segment having a sufficient drainage function and a method of manufacturing the same. Aim.
[0005]
[Means for Solving the Problems]
To achieve the above object, a tunnel lining segment and a method for manufacturing the same according to the present invention have the following configurations.
[0006]
That is, the segment for tunnel lining according to the present invention is characterized in that a fireproof plate is provided on the inner surface of a concrete segment body laid on the inner peripheral surface of the tunnel, and a drain passage is formed between the fireproof plate and the segment body. And The drainage passage is formed, for example, by a pipe having a peripheral wall surface having water permeability, or by a cavity.
[0007]
In addition, the method for manufacturing a segment for tunnel lining according to the present invention includes the steps of disposing a refractory plate formed in a predetermined size and shape in a segment forming mold and disposing a drainage passage forming material on the refractory plate. The concrete body is formed integrally with the refractory plate by pouring concrete into the formwork.
[0008]
As the drainage passage forming material, for example, a pipe having a peripheral wall surface having water permeability is used. Alternatively, an alkali-soluble material or a biodegradable material is used as the drainage passage forming material, and after forming the segment main body, the drainage passage forming material is gradually dissolved or decomposed and removed by an alkali component or microorganisms in the concrete constituting the segment main body. The remaining cavity can be used as a drain passage.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a tunnel lining segment and a method for manufacturing the same according to the present invention will be specifically described based on an embodiment shown in the drawings.
[0010]
FIG. 1 is a front view of a state in which a tunnel lining segment according to the present invention is installed on the inner surface of a tunnel, FIG. 2A is an enlarged front view of one segment, and FIG. FIG. 3C is a cross-sectional plan view thereof.
[0011]
The tunnel lining segment 1 in the illustrated example is formed in a substantially arc shape along the inner peripheral surface of the tunnel T to be laid as shown in FIG. 1, and the segments 1 are sequentially arranged in the circumferential direction of the inner surface of the tunnel and in the longitudinal direction of the tunnel. Tunnel lining is formed by placing them side by side.
[0012]
As shown in FIG. 2, each of the segments 1 is provided integrally with a refractory plate 3 made of a metal steel plate or the like on the inner surface of a concrete segment main body 2, and a part between the refractory plate 3 and the segment main body 2. In this configuration, a drain passage 4 is provided. The drain passage 4 is formed in a mesh shape in the present embodiment, and particularly in the illustrated example, is formed in a lattice shape inclined with respect to the vertical direction as shown in FIG. Can be guided from an arbitrary position of the segment to a drainage mechanism (not shown) below the tunnel. However, the laying shape of the drainage passage is not limited to the illustrated example, but may be a stripe shape, a wave shape, or any other appropriate shape. .
[0013]
The configuration of the drain passage 4 is appropriate. For example, as shown in FIG. 3A, a pipe 41 having a water-permeable peripheral wall is interposed between the segment main body 2 and the fireproof plate 3. Is defined as a drain passage 4. Alternatively, as shown in FIG. 3B, a cavity 42 may be formed in a part between the segment main body 2 and the refractory plate 3, and the cavity 42 may be used as the drain passage 4.
[0014]
When the drain passage 4 is formed by the tube 41 as described above, the material thereof is, for example, a braided tube (mesh tube) in which synthetic fibers (monofilaments) such as polyester are braided in a tubular shape, or a porous tube made of synthetic resin or metal. Other various perforated pipes can be used.
[0015]
Means for forming the drainage passage 4 including the hollow portion 42 include, for example, an alkali-soluble material or a biodegradable material between the segment body 2 and the refractory plate 3 as shown in FIG. A rod-shaped or tubular drainage passage forming material 40 made of a material or the like is disposed, and after the segment main body is formed, the drainage passage forming material 40 is gradually dissolved or decomposed and removed by an alkali component or microorganisms in the concrete as shown in FIG. Then, the remaining hollow portion 42 may be used as the drain passage 4.
[0016]
Since the drainage passage 4 is formed between the segment body 2 and the refractory plate 3 in this manner, the segment 1 permeates into the segment body 2 in a state where the segment 1 is constructed on the inner peripheral surface of the tunnel as shown in FIG. Water can be drained well through the drain passage 4.
[0017]
The adjacent segments 1 are connected to each other by connecting bolts or the like, which are not shown in the drawing, and a water blocking material 5 is usually interposed between the adjacent segment bodies 2 as shown in FIG. The drain passages 4 of the vertically adjacent segments 1 communicate with each other through a small gap, and the water flowing into the drain passages 4 of each segment 1 is sequentially guided downward, and a drain mechanism at the lower part of the tunnel, not shown in the drawing. From the outside of the tunnel.
[0018]
Further, since the drain passage 4 is provided not on the entire surface between the segment main body 2 and the fireproof plate 3 but only on a part thereof, the segment main body 2 and the fireproof plate 3 are in direct contact with each other without passing through the drain passage 4. Thus, it is possible to secure a large area of the region to be joined, and thereby the segment main body 2 and the refractory plate 3 can be firmly and integrally and tightly joined together.
[0019]
Next, in manufacturing the above-described segment for tunnel lining, it may be manufactured, for example, in the following manner. First, the refractory plate 3 is formed in a predetermined size and shape in advance, and the refractory plate 3 is disposed in the segment forming mold 10 as shown in FIG. Next, the segment body 2 may be formed integrally with the refractory plate 3 by pouring concrete into the formwork 10 with the drainage passage forming material 40 disposed on the refractory plate 3. In the figure, reference numeral 11 denotes a molding lid that covers the upper portion of the frame 10.
[0020]
When the above-described pipe 41 is used as the drainage passage forming material 40, the pipe 41 is preferably made of a material that allows water to permeate the peripheral wall surface but does not allow kneaded concrete to pass therethrough. Thereby, it is possible to prevent concrete from entering the pipe body 41 at the time of forming the segment body, and after laying in the tunnel, water penetrating into the concrete segment body 2 penetrates the peripheral wall surface of the tube body 41. To enter the pipe 41 and be discharged downward through the drain passage 4 in the pipe 41.
[0021]
In the case where a pipe through which concrete passes or a pipe through which concrete can pass is used as the above-described pipe 41, for example, water is applied to at least the surface of the pipe 41 opposite to the refractory plate 3 as shown in FIG. By installing a mat-shaped or sheet-shaped water-permeable cover 6 made of synthetic fiber or the like that transmits but does not transmit concrete, it is possible to prevent concrete from entering the pipe 41.
[0022]
When the hollow portion 42 is formed between the segment main body 2 and the refractory plate 3 as described above, and the hollow portion 42 is used as the drain passage 4, as described above, the segment main body 2 and the fireproof A drainage passage forming material 40 may be interposed between the plate 3 and the drainage passage formation material 40 after molding. The drainage passage formation material 40 may be removed by an appropriate means. For example, an alkali-soluble material or a biodegradable material may be used as the drainage passage formation material 40. If the drainage passage forming material 40 is gradually dissolved or decomposed and removed by an alkali component or microorganisms in the concrete constituting the segment main body after forming the segment body, the drainage passage forming material 40 is dissolved. Can be dissolved without using a chemical solution or the like.
[0023]
In particular, for example, when using a polylactic acid fiber or the like made from lactic acid obtained from starch such as corn, it can be dissolved by an alkali component in concrete and biodegradable by microorganisms in the ground or concrete. . When a segment was actually manufactured using a polylactic acid fiber formed into a string having a diameter of about 5 mm as the drainage passage forming material 40, the polylactic acid fiber was in a state as shown in FIG. After about one week, the drainage passage 4 consisting of the hollow portion 42 was successfully formed between the segment body 2 and the refractory plate 3 almost completely, as shown in FIG.
[0024]
【The invention's effect】
As described above, the segment 1 for tunnel lining according to the present invention is provided with the refractory plate 3 on the inner surface of the concrete segment body 2 laid on the inner peripheral surface of the tunnel, and between the refractory plate 3 and the segment body 2. Since the drain passage 4 is formed, the water that has penetrated into the segment main body by the drain passage 4 can be discharged well. The segment body 2 and the refractory plate 3 are tightly bonded to each other in the adjacent drain passages 4 and 4 and are firmly integrated, and are locked over substantially the entire surface between the segment body and the refractory plate as described above. It is possible to prevent the joint strength between the segment main body 2 and the refractory plate 3 from being reduced as in the case where a water guide material such as wool is interposed.
[0025]
The method for manufacturing a tunnel lining segment according to the present invention includes disposing a refractory plate 3 formed in a predetermined size and shape in a segment forming mold 10 and forming a drainage passage forming material 40 on the refractory plate 3. The segment body 2 is formed integrally with the refractory plate 3 by pouring concrete into the formwork 10 in a state in which the components are arranged, so that the segment having the refractory plate 3 and the drain passage 4 can be easily and inexpensively manufactured. be able to. In particular, if an alkali-dissolving material is used as the drainage passage forming material 40, and after the segment main body is formed, the drainage passage forming material 40 is gradually dissolved and removed by an alkali component in concrete constituting the segment main body, a hollow shape can be obtained. Can easily be formed, and there is an effect that a segment having good drainage performance and fire resistance can be easily and inexpensively manufactured.
[Brief description of the drawings]
FIG. 1 is a front view showing a construction state of a segment for tunnel lining according to the present invention.
FIG. 2A is an enlarged front view of the tunnel lining segment.
(B) is a partially cutaway side view.
(C) is a cross-sectional plan view thereof.
FIG. 3A is a cross-sectional view illustrating an example of a drain passage.
(B) is a sectional view showing another example of a drain passage.
FIG. 4A is a cross-sectional view of a state in which a drain passage is formed by a drain passage forming material.
(B) is sectional drawing in the state where the drainage passage forming material disappeared.
FIG. 5 is an enlarged sectional view of a segment connecting portion.
FIG. 6 is an explanatory diagram showing an example of a segment forming procedure.
FIG. 7 is a cross-sectional view of an example in which a water-permeable cover is provided on a drainage passage forming material.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Segment for tunnel lining 2 Segment main body 3 Fireproof plate 4 Drainage passage 40 Drainage passage forming material 41 Tube 42 Cavity 5 Waterproof material 6 Water permeable cover T Tunnel

Claims (7)

A segment for tunnel lining, wherein a fireproof plate is provided on an inner surface of a concrete segment body laid on an inner peripheral surface of a tunnel, and a drainage passage is formed between the fireproof plate and the segment body. The segment for tunnel lining according to claim 1, wherein the drain passage is formed by a pipe having a peripheral wall surface having water permeability. The tunnel lining segment according to claim 1, wherein the drain passage is formed by a cavity. A fireproof plate formed in a predetermined size and shape is arranged in a segment forming mold in advance, and concrete is poured into the mold in a state where a drainage passage forming material is arranged on the fireproof plate. A method for manufacturing a segment for tunnel lining, wherein a segment main body is formed integrally with the segment. The method for producing a segment for tunnel lining according to claim 4, wherein a pipe having a peripheral wall surface having water permeability is used as the drainage passage forming material. An alkali-dissolving material or a biodegradable material is used as the drainage passage forming material, and after forming the segment main body, the drainage passage forming material is gradually dissolved or decomposed and removed by an alkali component or microorganisms in concrete constituting the segment main body. 5. The method for manufacturing a tunnel lining segment according to claim 4, wherein the remaining cavity is used as a drain passage. Method for manufacturing a segment tunnel lining according to claim 6, wherein using the polylactic acid fibers as the alkaline lysis material or biodegradable material.

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