JP4594177B2 - Covering concrete connection structure in tunnel and forming method of lining concrete in tunnel - Google Patents

Description

  The present invention relates to a structure for connecting two adjacent lining concretes when forming a plurality of lining concretes along the longitudinal direction of the tunnel and arranging them on the inner periphery of the tunnel, and molding these lining concretes. It is about how to do.

  Conventionally, in both lining concretes adjacent to each other, the boundary portion is exposed at the inner periphery between the joint end faces of both joint portions.

Of the exposed surface of the lining concrete, in particular, the boundary portion may be weathered and damaged due to a change with time.
An object of the present invention is to prevent the boundary portion from being damaged.

The present invention will be described with reference to the reference numerals of the drawings (FIGS. 1 to 5) of the embodiments described later.
In the lining concrete connection structure in the tunnel 1 according to the invention of claim 1, a plurality of lining concretes 15, 16 are formed along the longitudinal direction X of the tunnel 1 on the inner periphery of the tunnel 1, and are aligned with each other. Between the adjacent lining concretes 15 and 16, a joint portion 17 having a joint end surface 17a facing each other is provided, and a concealing plate 6 that covers a boundary portion 18 formed on the inner periphery between the joint end surfaces 17a of the both joint portions 17 is provided. Provided. By the way, the concealment plate 6 can be integrally attached by insert molding at the time of molding the lining concrete 15 or 16 as in the invention of claim 4 or can be attached after molding the lining concrete 15 or 16. Also good. Therefore, it is possible to delay the weathering of the boundary portion 18 covered by the concealment plate 6 due to a change with time.

Further, the concealing plate 6 has a flexible portion 7 facing the boundary portion 18 between the two joint portions 17, and the flexible portion 7 is formed by the shrinkage of the two lining concretes 15 and 16, and the joint portions thereof. When 17 separates, it deform | transforms so that the contraction may be permitted. Therefore, the deformation of the flexible portion 7 can prevent the concealment plate 6 from being damaged when the two lining concretes 15 and 16 are contracted.

Further, the flexible portion 7 of the concealing plate 6 faces the boundary portion 18 of the both joint portions 17 and enters between the joint end surfaces 17a, and the bent plate portion 10 facing the boundary portion 18 and the boundary The side plate part 11 is provided so as to extend outward from the part 18 so as to face each other from both ends of the bent plate part 10. Incidentally, it is not necessary to provide a bending allowance space like the groove part 12 concerning embodiment mentioned later between the both-sides board part 11 of the flexible part 7. FIG. Therefore, the form of the flexible part 7 can be simplified.

In the invention of claim 2 premised on the invention of claim 1 , the concealing plate 6 extends from the both side plate portions 11 of the flexible portion 7 in the longitudinal direction X of the tunnel 1 on the inner periphery of the joint portions 17. Support plate portions 8 and 9 extending along the same are provided. In the invention of claim 2 , the concealment plate 6 can be firmly attached to the both lining concretes 15 and 16 by the both support plate portions 8 and 9.

In the invention of claim 3 premised on the invention of claim 1 or claim 2 , the concealing plate 6 has a protrusion 14 that enters into the lining concrete 15, 16 when the lining concrete 15, 16 is formed. is doing. For example, the protrusion 14 is provided on the support plate portions 8 and 9 according to the invention of claim 2 . In the invention of claim 3 , the concealing plate 6 can be firmly attached to the both lining concretes 15 and 16 by the protrusions 14.

In the invention of claim 4 , the lining concrete 15 and 16 in the tunnel 1 is formed by the following method.
The first lining concrete 15 is poured into the first concrete placing chamber 4a in a state in which a part 6a of the concealing plate 6 is inserted into the end portion of the first concrete placing chamber 4a provided on the inner periphery of the tunnel 1, A part 6 a of the cover plate 6 is integrally attached to the inner periphery of the first cover concrete 15 by insert molding, and the remaining portion 6 b of the cover plate 6 is protruded from the inner periphery of the first cover concrete 15. . Next, the remaining portion 6b of the concealing plate 6 is inserted into the end portion of the second concrete placing chamber 4b provided on the inner periphery of the tunnel 1 adjacent to the first lining concrete 15 in the longitudinal direction X of the tunnel 1. In this state, the second lining concrete 16 is poured into the second concrete placing chamber 4a, and the remaining portion 6b of the concealing plate 6 is integrally attached to the inner periphery of the second lining concrete 16 by insert molding. The concealment plate 6 covers a boundary portion 18 that occurs on the inner periphery between the joint end faces 17a facing each other at the joint portion 17 between the adjacent first lining concrete 15 and the second lining concrete 16. In the invention of claim 4 , it is possible to delay the weathering of the boundary portion 18 covered with the concealment plate 6 due to a change with time, and firmly attach the concealment plate 6 to the both lining concretes 15 and 16. Can do.

  The present invention can prevent breakage of the boundary portion 18 that occurs on the inner periphery between the joint portions 17 of the two lining concretes 15 and 16 adjacent to each other.

Hereinafter, a covering concrete connecting structure in a tunnel and a forming method of the covering concrete in the tunnel according to an embodiment of the present invention will be described with reference to FIGS.
As schematically shown in FIG. 1, a formwork support device 2 with a carriage 2 a is installed in the tunnel 1, and a concrete placement chamber 4 is sequentially provided between the inner peripheral surface 1 a of the tunnel 1 and the formwork 3. It is done. As shown in FIG. 2 (a), in the preceding concrete placement chamber 4 (first concrete placement chamber 4a), one end of both ends in the longitudinal direction X of the tunnel 1 is the existing end plate structure 5 It is blocked by. The existing end plate structure 5 shown in FIG. 2B includes an air pack 5a. In the end plate structure portion 5, a concealment plate 6 integrally formed of plastic is incorporated in a range E in the circumferential direction Y of the tunnel 1 shown in FIG.

  In the concealing plate 6, as shown in FIG. 5A, an inverted U-shaped flexible portion 7 is extended over the range E in the circumferential direction Y of the tunnel 1 at an intermediate portion in the longitudinal direction X of the tunnel 1. In addition, on both sides of the flexible portion 7, support plate portions 8 and 9 are also extended over the range E in the circumferential direction Y of the tunnel 1. The flexible portion 7 is formed between the bent plate portion 10 that is inverted in an inverted U shape, the side plate portions 11 that extend opposite to each other from both ends of the bent plate portion 10, and the both side plate portions 11 to the outside. It consists of an open groove 12. The two support plate portions 8 and 9 are formed on the inner side of the flat plate portion 13 from the both side plate portions 11 of the flexible portion 7 along the longitudinal direction X of the tunnel, and are formed in the longitudinal direction of the tunnel 1. X is composed of a plurality of protrusions 14 that are aligned with each other across the flexible portion 7. A bulging portion 14 a is formed at the tip of each protrusion 14. Of the concealing plate 6, one support plate portion 8 and half (part 6 a) of the flexible portion 7 face one end of the mold 3 and are inserted into the first concrete placement chamber 4 a. The other support plate portion 9 and half of the flexible portion 7 (remaining portion 6b) are outside the first concrete placement chamber 4a.

  As shown in FIG. 3 (a), the first lining concrete 15 is poured into the first concrete placing chamber 4a and molded, and then the mold is supported as shown in FIGS. 3 (b) and 5 (a). When the mold 3 and the end plate structure portion 5 of the apparatus 2 are removed, a part 6a of the concealment plate 6 (half of the one support plate portion 8 and the flexible portion 7) is formed on the inner periphery of the first lining concrete 15. It is attached integrally by insert molding. In this molded state, each protrusion 14 of one support plate 8 enters the first lining concrete 15 and the flat plate portion 13 of one support plate 8 is exposed at the inner periphery of the first lining concrete 15. Then, the remaining portion 6 b of the concealment plate 6 (half of the other support plate portion 9 and the flexible portion 7) protrudes from the inner periphery of the first lining concrete 15 in the longitudinal direction X of the tunnel 1.

  As shown in FIG. 3 (c), the downstream concrete placement chamber 4 (second concrete placement chamber 4 b) adjacent to one end of the first lining concrete 15 in the longitudinal direction X of the tunnel 1 is tunneled. 1 is provided on the inner circumference. Of the concealment plate 6, the other support plate portion 9 and half of the flexible portion 7 (remaining portion 6b) face one end of the mold 3 and are inserted into the second concrete placing chamber 4b. As shown in FIG. 3 (d), after the second lining concrete 16 is poured into the second concrete placement chamber 4b and molded, the mold support device 2 is then used as shown in FIGS. 4 and 5 (b). When the mold 3 and the end plate structure portion 5 are removed, the remaining portion 6b of the concealment plate 6 (half of the other support plate portion 9 and the flexible portion 7) is inserted into the inner periphery of the second lining concrete 16 by insert molding. It is attached integrally. In this molded state, each protrusion 14 of the other support plate portion 9 enters the second lining concrete 16 and the flat plate portion 13 of the other support plate portion 9 is exposed at the inner periphery of the second lining concrete 16. Then, the concealing plate 6 causes a boundary portion 18 generated at the inner periphery between the joint end faces 17a facing each other at the joint portion 17 between the first lining concrete 15 and the second lining concrete 16 adjacent to each other. Covered. In that case, the flexible portion 7 of the concealing plate 6 faces the boundary portion 18 between the two joint portions 17 and enters between the joint end surfaces 17a, and the both lining concretes 15 and 16 contract to join them. When the parts 17 are separated from each other, the parts 17 are deformed to allow the contraction thereof.

  In this way, the first lining concrete 15 and the second lining concrete 16 are formed along the longitudinal direction X of the tunnel 1 on the inner periphery of the tunnel 1 and aligned with each other. And in the junction part 17 between this 1st lining concrete 15 and the 2nd lining concrete 16, the boundary part 18 which arises in the inner periphery between those joining end surfaces 17a will be in the state covered with the concealment board 6. .

  In another example of the mold 3 shown in FIG. 6A, a curve liner frame 3 a is provided facing the end plate structure 5. As shown in FIG. 6B, even if the tunnel 1 has a curved portion 1b, the curved liner frames 3a can smoothly connect the adjacent molds 3 to each other.

It is a cross-sectional view which shows a formwork support apparatus schematically in a tunnel. (A) (b) is a fragmentary sectional view which shows the formation process of the lining concrete in the tunnel concerning this embodiment, respectively. (A) (b) (c) (d) is a fragmentary sectional view which shows the formation process of the lining concrete in the tunnel concerning this embodiment, respectively. It is a fragmentary sectional view which shows the lining concrete connection structure in the tunnel concerning this embodiment. (A) is the elements on larger scale of FIG.3 (b), (b) is the elements on larger scale of FIG.4. FIG. 2A is a view corresponding to FIG. 2A showing another example of the formwork, and FIG. 2B is a partial cross-sectional view schematically showing the formwork as seen from the plane side at the curved portion of the tunnel.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Tunnel, 4a ... 1st concrete placement room, 4b ... 2nd concrete placement room, 6 ... Concealment board, 6a ... Part of concealment board, 6b ... Remaining part of concealment board, 7 ... Flexible part, 8, DESCRIPTION OF SYMBOLS 9 ... Support plate part, 10 ... Bending plate part, 11 ... Side plate part, 14 ... Projection part, 15 ... First lining concrete, 16 ... Second lining concrete, 17 ... Joining part, 17a ... Joining end face, 18 ... Boundary part, X: Longitudinal direction of the tunnel.

Claims (4)

In a plurality of lining concretes formed along the longitudinal direction of the tunnel on the inner circumference of the tunnel and arranged side by side, joints having joint end surfaces facing each other are provided between the two lining concretes adjacent to each other. A concealing plate that covers a boundary portion formed on the inner periphery between the joint end faces of the joint portion has a flexible portion facing the boundary portion of the two joint portions, and the flexible portion faces the boundary portion of the joint portions. A bent plate portion that enters between the joint end surfaces and faces the boundary portion, and a side plate portion that extends oppositely from both ends of the bent plate portion to the outside spaced from the boundary portion. A lining concrete connection structure in a tunnel, wherein the concrete is deformed to allow the contraction when the concrete is contracted and the joints are separated from each other . 2. The tunnel according to claim 1 , wherein the concealing plate includes a support plate portion extending along a longitudinal direction of the tunnel from both side plate portions of the flexible portion on an inner periphery of the both joint portions. Inside lining concrete connection structure. 3. The lining concrete connection structure in a tunnel according to claim 1 , wherein the concealing plate has a protrusion that enters into the lining concrete when the lining concrete is formed. 4. The first lining concrete is poured into the first concrete placement chamber with a part of the concealment plate inserted into the end of the first concrete placement chamber provided on the inner periphery of the tunnel. A part of the concealment plate is integrally attached to the inner periphery by insert molding, and the remaining part of the concealment plate is protruded from the inner periphery of the first lining concrete,
Next, in the state where the remaining part of the concealing plate is inserted into the end portion of the second concrete placing chamber adjacent to the first lining concrete in the longitudinal direction of the tunnel and provided in the inner periphery of the tunnel. Pour the second lining concrete into the casting room, and integrally attach the remaining part of the concealment plate to the inner periphery of the second lining concrete by insert molding.
In the tunnel characterized in that the concealing plate covers a boundary portion formed on the inner periphery between both joint end faces facing each other at the joint portion between the first lining concrete and the second lining concrete adjacent to each other. Forming method of lining concrete.

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