JP5539787B2 - Tunnel lining segment - Google Patents

Description

  The present invention relates to a tunnel lining segment used in a shield method.

  For example, in laying a sewer pipe by the shield method, it is common to protect the primary lining by performing a secondary lining inside the primary lining in order to prevent corrosion of the primary lining. However, when the secondary lining is performed after securing the necessary inner space in the tunnel, the outer diameter of the tunnel inevitably increases, leading to an increase in the cost of tunnel construction. Therefore, as a method of omitting the secondary lining, it is known to provide a corrosion-proof layer on the inner surface of the segment by, for example, spraying or coating a material such as an anti-corrosive synthetic resin on the inner surface of the segment (for example, Patent Documents) 1 etc.).

  The anticorrosion lining segment disclosed here is provided with an anticorrosion layer on the inner peripheral surface for preventing corrosion inside the segment due to sewage in the tunnel. More specifically, a water permeable layer provided on the outer peripheral side from the anticorrosion layer, and a drainage means for draining water from the water permeable layer to the inside of the tunnel or the end of the tunnel. According to this configuration, in the laying of the sewer pipe, the secondary lining is omitted, and the anticorrosion layer that protects the corrosion of the primary lining caused by the sewage is not peeled off or destroyed by the water pressure of the groundwater.

Japanese Patent No. 4076270

  However, the anticorrosion layer must be formed with a plurality of cutout portions for exposing the joint member, and after the segments are connected, a joint member using a closure member such as a lid or a filler (mortar) is used. It was necessary to cover the opening and cover the surface with an anticorrosion layer. For this reason, post-corrosion protection layers are formed at a plurality of locations in the corrosion protection layer, and the service life is shortened. Moreover, this connection part reduced running performance. Further, if a separate lid member is used, the number of parts increases, the segment manufacturing cost increases, the closing work becomes complicated, and the tunnel construction cost also increases. In addition, the appearance of a plurality of post-corrosion protection layers on the protection layer deteriorates the appearance of the inner peripheral surface of the tunnel.

  The present invention has been made in view of the above situation, and its purpose is to increase the service life, improve the running performance, reduce the segment manufacturing cost and the tunnel construction cost, and improve the appearance. It is to provide a lining segment.

Next, means for solving the above problems will be described with reference to the drawings corresponding to the embodiments.
The tunnel lining segment according to claim 1 of the present invention includes a segment body 11,
A non-woven fabric 17 is laminated on the back surface 15 of the resin sheet base material 13, and the non-woven fabric 17 is embedded in the concrete 19 at the time of placing the segment body 11 into the concrete to surround at least one of the inside and outside of the segment body 11. A covering sheet 23 covering the surface 21;
It has.
In Claim 2, the nonwoven fabric 17 of the said covering sheet 23 is 0.3-1.0 mm in thickness, and a density is set to 80-160, It is characterized by the above-mentioned.

In this lining segment for tunnels, the covering sheet 23 is attached to the segment main body 11 with a high adhesive force by the anchor effect when the nonwoven fabric is embedded in the concrete 19. As in claim 2, the nonwoven fabric 17 has a thickness of 0.3 to 1.0 mm, and a value obtained by dividing the basis weight (g / m ² ) by the thickness (mm) is a density, and the numerical value is 80 to 160. exhibit better anchor effect by an, integrated with the concrete curing. By covering the inner peripheral surface and / or outer peripheral surface of the segment main body 11 with the covering sheet 23, the outer peripheral surface of the tunnel and / or the inner surface of the tunnel are not covered with a mixture of different material sheets or the same type of sheets. Thereby, if the segment main body 11 is reliably covered and the surrounding surface of the natural mountain side, which is the outer peripheral surface of the tunnel, is covered, for example, corrosion prevention in the case of acidic soil or the like is achieved, and the inner surface of the tunnel is configured. In some cases, the roughness coefficient is constant. Moreover, the step part by the position shift by sticking a separate sheet | seat, and the recessed part by a clearance gap do not generate | occur | produce.

In the lining segment for a tunnel according to claim 1 , the opening 27 opens into the inner peripheral surface 21 of the segment main body 11 and is embedded in the segment main body 11, and one side surface 29 is connected to the connecting surface 31 of the segment main body 11. A connection box 33 to be arranged;
A flap portion 39 formed at the position of the opening portion 27 of the connection box 33 and capable of opening and closing the opening portion 27 by a cut portion 37 cut from an edge portion 35 of the covering sheet 23;
It is characterized by comprising.

In this lining segment for tunnels, the flap part 39 can be opened and closed with a continuous part other than the cut part as a hinge, with the cut part 37 positioned at the opening part 27 of the connection box 33 as a boundary, and the flap part 39 serves as a lid member. Comes to work.

The tunnel lining segment according to claim 3 is the tunnel lining segment 100 according to claim 1 or 2,
The flap portion 39 is characterized in that the non-woven fabric 17 is embedded in a filler 41 filled in the connection box 33 so as to cover the opening 27 of the connection box 33.

  In this tunnel lining segment, the flap portion 39 is rolled up, and after the bolt fastening operation is completed inside the connection box 33, the connection box 33 is filled with the filler 41. Immediately after that, the flap portion 39 that has been rolled back is returned to its original state, so that the nonwoven fabric 17 of the flap portion 39 is embedded in the filler 41, and the flap portion 39 is integrally attached to the filler 41.

The tunnel lining segment according to claim 4 is the tunnel lining segment 100 according to any one of claims 1, 2, and 3,
The resin sheet substrate 13 of the covering sheet 23 is characterized in that a surface 43 opposite to the back surface 15 on which the nonwoven fabric 17 is laminated is colored for a tunnel inner surface color.

  In this tunnel lining segment, the surface 43 of the covering sheet 23 is colored so that the inner peripheral surface of the tunnel becomes a colored surface after the segments are connected. Moreover, only the covering sheet 23 of a desired segment may be colored and connected, for example, in a staggered arrangement.

The tunnel lining segment according to claim 5 is the tunnel lining segment 100 according to claim 4 ,
The resin sheet substrate 13 of the covering sheet 23 is characterized in that an uneven portion is formed on the surface 43.

  In this lining segment for tunnels, an uneven portion is formed on the surface 43 of the covering sheet 23, so that the inner peripheral surface of the tunnel becomes an uneven surface after the segments are connected. Moreover, an uneven | corrugated | grooved part may be formed only in the covering sheet 23 of a desired segment, and it may be connected, for example in a staggered arrangement.

According to the lining segment for a tunnel according to claim 1 of the present invention, the segment body and the nonwoven fabric are laminated on the back surface and the nonwoven fabric is embedded in the segment body so that at least one of the inner and outer peripheral surfaces of the segment body is provided. Since the covering sheet covering the surface is provided, the service life of the segment is increased, and the segment manufacturing cost and the tunnel construction cost can be reduced. Further, the adhesion between the nonwoven fabric and the covering sheet is improved, concrete is appropriately impregnated into the nonwoven fabric, it is possible to obtain sufficient adhesion to exhibit good anchor effect, it is integrated with the concrete curing It will be. And according to this lining segment for tunnels, if the outer peripheral surface of the segment body is covered with the covering sheet, the peripheral surface of the natural mountain side that is the outer peripheral surface of the tunnel will be covered, for example, in the case of acidic soil etc. If it becomes the structure which becomes corrosion prevention and covers the internal peripheral surface of a segment main body with a coating sheet, it can improve a running performance and can make it look favorable.

According to lining segments for tunnels as claimed in claim 1, wherein, cell and connecting box segment is embedded in the body, and can open and close the opening by indentations that cut from the edge of the connecting box cover sheet is formed in the opening of The flap portion becomes a lid portion that opens and closes the opening portion of the connection box, and a number of lid members that are conventionally required separately are not necessary. As a result, the number of parts can be reduced, and member costs and parts management labor can be reduced.
As described in claim 2, the non-woven fabric has a thickness of 0.3 to 1.0 mm, and a value obtained by dividing the basis weight (g / m ² ) by the thickness (mm) is a density, and the numerical value is 80. -160, the adhesion between the non-woven fabric and the covering sheet is improved, and the concrete is appropriately impregnated into the non-woven fabric so that a better anchoring effect can be obtained and sufficient adhesion can be obtained. It will be integrated with curing.

  According to the tunnel lining segment of claim 3, since the flap portion is embedded with a non-woven fabric in the filler filled in the junction box, the surface of the segment body is covered when covering the junction box. It becomes possible to cover with a covering sheet. As a result, workability, running performance, and appearance can be improved.

  According to the lining segment for a tunnel according to claim 4, since the surface of the coating sheet opposite to the back surface on which the nonwoven fabric is laminated is colored for the inner color of the tunnel, the surface of the segment is covered with the colored coating sheet, The design of the inner peripheral surface of the tunnel can be improved by giving it a design.

  According to the lining segment for a tunnel according to claim 5, since the concavo-convex portion is formed on the surface of the covering sheet, the surface of the segment is covered with the covering sheet of the concavo-convex surface, and the design is provided on the uneven surface, The appearance of the inner peripheral surface can be improved.

It is a perspective view of the lining segment for tunnels concerning this invention. It is a perspective view of the segment main body shown in FIG. It is a perspective view of the segment main body by which the connection box is arrange | positioned at four sides. FIG. 4 is a perspective view of a tunnel lining segment in which a covering sheet is attached to the segment body of FIG. 3. (A) is a perspective view of a flap part, (b) is a top view of a flap part. It is an expanded sectional view of a junction box and a flap part. It is an expanded sectional view of the connection box which the flap part adhered to the filler. It is process explanatory drawing showing the manufacturing procedure of the lining segment for tunnels. (A) is a perspective view of the flap part which made the notch part T-shaped, (b) is the top view. (A) is a perspective view of the flap part which made the notch part L-shaped, (b) is the top view. (A) is a perspective view of the flap part which made the notch part a linear form, (b) is the top view.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of a tunnel lining segment according to the present invention.
A lining segment for tunnel (hereinafter, also simply referred to as “segment”) 100 is used in a shield method, and is preferably used as a reinforced concrete (RC) segment or a concrete-filled steel segment. The segment 100 includes a segment body 11 and a covering sheet 23. The segment body 11 is formed as an arc-shaped plate obtained by dividing a predetermined length of the tunnel lining in the circumferential direction. Therefore, in the segment 100, the convex curved surface side is the natural mountain side, and the concave curved surface side is the inside of the tunnel (inner side). The covering sheet 23 is attached to the concave surface side of the segment body 11 that is inside the tunnel.

  A grout injection hole 51 is formed in the center of the segment 100. The grout injection hole 51 is for injecting and filling a grout material (not shown) in a gap portion between the outer surface of the segment 100 and the ground, and is closed after the grout material is injected. Although some segments 100 do not have the grout injection hole 51, in this embodiment, the segment 100 in which the grout injection hole 51 is formed is taken as an example. Of course, the segment 100 according to the present invention may be one without the grout injection hole 51.

  A plurality of segments 100 are connected in the circumferential direction to form an annular body, and are also connected to the axial direction of the annular body to form a tubular tunnel space. Therefore, a plurality of connection holes 55 for inserting fasteners such as bolts are provided in the connection surface 31 that is the side surface of the segment 100.

FIG. 2 is a perspective view of the segment body shown in FIG.
The connection hole 55 provided in the connection surface 31 is divided into two types: a through hole 55a that only inserts a bolt and a nut hole 55b in which a nut that is screwed into the bolt is embedded. In the segment 100, when the through hole 55 a is arranged in the connection surface 31 of one segment 100 when the segments 100 are connected, a nut hole 55 b is arranged in the connection surface 31 of the other segment 100. The through hole 55 a is formed in the connection box 33 in the segment body 11. That is, the connection box 33 has the opening 27 opened in the inner peripheral surface 21 of the segment main body 11 and embedded in the segment main body 11, and one side surface 29 is disposed on the connection surface 31 of the segment main body 11. The bolt inserted into the through hole 55 a from the opening 27 of the connection box 33 is screwed into the nut hole 55 b of the counterpart segment 100 to fasten the connection surfaces 31 of the segment 100.

The segment 100 is connected by fastening the connecting surfaces of the bolt and the nut hole 55b. In addition, the segment does not have the nut hole 55b, and the nut is attached to the bolt end penetrating the mating connection box 33. Some types are screwed together.
FIG. 3 is a perspective view of the segment body in which the junction box is arranged on four sides.
In this type of segment body 11A, as shown in FIG. 3, a plurality of connection boxes 33 are arranged on all four sides.

4 is a perspective view of a tunnel lining segment in which a covering sheet is attached to the segment body of FIG.
Also in the case of the segment main body 11A in which the junction box 33 is arranged on the four sides, as shown in FIG. 4, the covering sheet 23 is attached to the inner peripheral surface 21 to constitute the segment 100A. . As described above, since only the connection structure is different between the segment 100 and the segment 100A, the segment 100 will be mainly described as a representative example in the following description.

FIG. 5A is a perspective view of the flap portion, and FIG. 5B is a plan view of the flap portion.
A flap portion 39 is formed in the cover sheet 23 at the position of the opening 27 of the connection box 33. The flap portion 39 is formed by, for example, a pair of parallel straight cut portions 37 and 37 cut from the edge portion 35 of the covering sheet 23, and allows the opening portion 27 to be opened and closed. The flap part 39 is for winding the covering sheet 23, and opens the connection box 33 only at the time of bolt coupling work.

  In the segment 100, the flap portion 39 can be opened and closed with a continuous portion 39 a other than the cut portion as a hinge, with the cut portions 37, 37 positioned at the opening portion 27 of the connection box 33 as a boundary, and the flap portion 39 serves as a lid member. Comes to work. Thus, by forming the flap part 39 in the covering sheet 23, the flap part 39 becomes a lid part that opens and closes the opening part 27 of the connection box 33, and many lid members conventionally required separately are unnecessary. It becomes. As a result, the number of parts can be reduced, and member costs and parts management labor can be reduced.

FIG. 6 is an enlarged cross-sectional view of the junction box and the flap portion.
As the covering sheet 23, soft or hard PVC (polyvinyl chloride) is suitably used for the resin sheet base material 13. In the present embodiment, a soft resin sheet (PVC sheet) substrate 13 is used. In addition, the resin-made sheet base material 13 is good also as a polyethylene-type resin sheet, a polypropylene-type resin sheet, etc. other than a soft PVC sheet. The covering sheet 23 is formed by laminating a nonwoven fabric 17 on the back surface 15 of the resin sheet base material 13. The nonwoven fabric 17 is laminated and formed on the back surface 15 of the resin sheet base material 13 by, for example, laminating. The nonwoven fabric 17 may be bonded to the resin sheet base 13 with an adhesive. In this way, the covering sheet 23 provided with the nonwoven fabric 17 on the back surface 15 covers the inner peripheral surface 21 of the segment body 11 by the nonwoven fabric 17 being embedded in the concrete 19 when the segment body 11 is poured into the concrete. That is, the covering sheet 23 has the non-woven fabric 17 laminated on the concrete adhering side and has an anchor effect. The nonwoven fabric 17 is also provided continuously on the back surface 15 of the flap part 39 described above. The bolt 57 inserted through the connection box 33 is screwed into the nut hole 55 b of the mating segment 100.

FIG. 7 is an enlarged cross-sectional view of a junction box in which a flap is attached to a filler.
The segment 100 is attached so that the flap portion 39 embeds the nonwoven fabric 17 in the filler 41 filled in the connection box 33 and covers the opening 27 of the connection box 33. After the bolt 57 is fastened, the inner space 33 a is filled with the filler 41, and the nonwoven fabric 17 of the flap portion 39 is embedded in the filler 41, so that the flap portion 39 is attached to the opening 27 of the connection box 33. Is done. As a result, the entire inner peripheral surface 21 of the segment body 11 is covered with only one cover sheet 23 without the need for other members. For example, mortar is used as the filler 41. Although the nonwoven fabric 17 of the flap part 39 is embedded in this filler 41, it may be adhered to the cured filler 41 with an adhesive.

  The resin sheet substrate 13 of the covering sheet 23 may have a surface 43 opposite to the back surface 15 on which the nonwoven fabric 17 is laminated, colored for tunnel inner surface color. By coloring the surface 43 of the covering sheet 23, the tunnel inner peripheral surface 21 becomes a colored surface after the segments 100 are connected. Further, only the covering sheet 23 of the desired segment 100 may be colored and connected, for example, in a staggered arrangement. In this way, the surface 43 of the covering sheet 23 is colored for the inner color of the tunnel, so that the inner peripheral surface 21 of the segment body 11 is covered with the colored covering sheet 23, and the design is given by coloring. The appearance of the inner peripheral surface 21 can be improved.

  Further, the resin sheet substrate 13 of the covering sheet 23 may have an uneven portion formed on the surface 43. By forming the uneven portion on the surface 43 of the covering sheet 23, the tunnel inner peripheral surface 21 becomes an uneven surface after the segments 100 are connected. Moreover, an uneven | corrugated | grooved part may be formed only in the coating sheet 23 of the desired segment 100, for example, may be connected with a staggered arrangement. Thus, by forming the concavo-convex portion on the surface 43 of the covering sheet 23, the inner peripheral surface 21 of the segment body 11 is covered with the concavo-convex covering sheet 23, and the design is provided on the concavo-convex surface, The appearance of the tunnel inner peripheral surface 21 can be improved.

Next, the operation of the tunnel lining segment 100 having the above configuration will be described.
FIG. 8 is a process explanatory view showing the manufacturing procedure of the tunnel lining segment.
In order to manufacture the segment 100, the cut portions 37 and 37 are put in the covering sheet 23 at a position corresponding to the connection box 33 in advance. The covering sheet 23 has a non-woven fabric 17 attached to the back surface 15. Grout injection hole 51 is drilled as necessary. In the formation of the grout injection hole 51, a circular flap portion 39 having a connecting portion as a hinge can be formed by cutting out a portion in the circumferential direction as a continuous portion without forming a through hole.

  The covering sheet 23 in which the cut portion 37 and the grout injection hole 51 are formed in this way is laid on the bottom portion 59a of the mold 59 so that the surface 43 is on the lower side. Thereby, as for the covering sheet 23, the back surface 15 provided with the nonwoven fabric 17 (see FIG. 6) is arranged on the upper side. On the upper side of the covering sheet 23, a reinforcing bar 61 laid according to the shape of the segment body 11 is placed. The connection box 33 is fixed at a predetermined position of the reinforcing bar 61. When the grout injection hole 51 is provided, an injection pipe (not shown) is fixed to the reinforcing bar 61.

  In the connection box 33 fixed to the reinforcing bar 61, the opening part 27 (see FIG. 6) is pressed and arranged in the flap part 39 in which the cutting part 37 is inserted by placing the reinforcing bar 61 on the mold 59. . Thereby, the concrete 19 poured into the mold 59 does not enter the internal space 33a (see FIG. 6) of the connection box 33.

  When the reinforcing bar 61 is positioned at a predetermined position, the concrete 19 is poured into the mold 59. After the concrete 19 is poured, the concrete 19 is compacted by applying vibration by a vibrator. The nonwoven fabric 17 of the covering sheet 23 is embedded in the concrete 19. Thereby, the nonwoven fabric 17 provided in the inner surface side exhibits the anchor effect with respect to the concrete 19, and the coating sheet 23 is integrated with the segment main body 11 with concrete hardening. The segment 100 in which the covering sheet 23 is integrated with the inner peripheral surface 21 is increased in strength and the occurrence of cracks is also reduced.

The covering sheet 23 is composed of a nonwoven fabric 17 having a thickness of 0.75 mm and a density of 112 g / m ^2, and the nonwoven fabric is integrated on the surface of the soft PVC sheet. For example, thermal lamination is performed when the PVC sheet is manufactured. It was integrated with or attached to the PVC sheet using an adhesive and integrated, and the non-woven fabric 17 was embedded in the concrete 19 and the adhesion of the covering sheet 23 was measured. The adhesion was confirmed. Here, the calculation of the density is a numerical value obtained by dividing the basis weight (g / m ² ) by the thickness (mm).

  After the placement of the concrete 19 is completed, the concrete 19 is cured by curing for a predetermined time. When the concrete 19 has hardened, the mold 59 is removed and the manufacture of the segment 100 is completed.

  In the segment 100 manufactured in this manner, the flap portion 39 is rolled up, and after the bolt fastening operation is completed inside the connection box 33, the connection box 33 is filled with the filler 41. Immediately after that, the flap portion 39 is returned to its original state, so that the nonwoven fabric 17 of the flap portion 39 is embedded in the filler 41, and the flap portion 39 is integrated with the filler 41 as shown in FIG. Pasted. Therefore, since the flap part 39 embeds and pastes the nonwoven fabric 17 in the filler 41 filled in the connection box 33, when covering the connection box 33, the entire inner peripheral surface 21 of the segment body 11 is covered. It becomes possible to cover with one cover sheet 23. As a result, workability, running performance, and appearance can be improved.

  In addition, if it replaces with the coating sheet 23 which stuck the nonwoven fabric 17 on the soft PVC sheet, and laminates the nonwoven fabric 17 on a hard PVC plate, the high-strength type segment 100 can be obtained.

  In this segment 100, the nonwoven fabric 17 is embedded in the concrete 19, so that the covering sheet 23 is attached to the segment main body 11 with a high adhesive force by an anchor effect. Since the inner peripheral surface 21 of the segment main body 11 is covered with a single covering sheet 23, the inner surface 43 of the tunnel is not covered with a mixture of different material sheets or sheets of the same type. Thereby, the segment main body 11 is reliably covered, and the tunnel inner surface 43 has a constant roughness coefficient. Moreover, the overlapping step part of a sheet | seat by the separate sheet | seat being affixed, and the recessed part by the clearance gap between sheets do not generate | occur | produce.

  Therefore, according to the segment 100 according to the present embodiment, the anticorrosion effect is improved, the service life is increased, the running performance is improved, the segment production cost and the tunnel construction cost can be reduced, and the appearance is improved. it can.

  In addition, the covering sheet 23 can be easily obtained and manufactured at a low cost as compared with panel sticking and coating film formation (application). In particular, the use of the nonwoven fabric 17 ensures good adhesion and ensures the formation of the anticorrosion layer. Furthermore, the cushioning property (flexibility) of the PVC sheet provides an effect of reducing the impact on the segment main body 11 and improves the durability of the tunnel housing.

  In the above-described embodiment, the example in which the inner peripheral surface 21 of the segment main body 11 is covered with the covering sheet 23 has been described. However, the covering sheet 23 may be configured to cover the outer peripheral surface of the segment main body 11. Moreover, it is good also as a structure which covers inner and outer both peripheral surfaces. By covering the outer peripheral surface of the segment main body 11 with the covering sheet 23, the peripheral surface of the natural mountain side which is the outer peripheral surface of the tunnel is covered. For example, corrosion prevention when the natural soil side is acidic soil or the like. The effect can be obtained.

Next, a modified example of the tunnel lining segment having the flap portions having different shapes will be described.
FIG. 9A is a perspective view of a flap portion having a T-shaped cut portion, and FIG. 9B is a plan view thereof.
In the flap portion 39 </ b> A shown in FIG. 9, a T-shaped cut portion 37 </ b> A is formed at the position of the covering sheet 23 corresponding to the connection box 33. Therefore, in the flap portion 39A, the left and right side portions 63, 63 are double-spread. According to this modification, the continuous portion 39a becomes larger than the area of the flap portion 39A, and the flap portion 39A can be hardly peeled off.

FIG. 10A is a perspective view of a flap portion having an L-shaped cut portion, and FIG. 10B is a plan view thereof.
In the flap portion 39B shown in FIG. 10, an L-shaped cut portion 37B is formed at the position of the covering sheet 23 corresponding to the connection box 33. Accordingly, the flap portion 39B is rolled in the direction a along the circumferential direction of the segment 100. In this configuration, the flap portion 39B is deformed along the concave curved surface. As a result, compared to a configuration in which the tunnel is stretched in the longitudinal direction b, residual distortion due to stress concentration is less likely to occur in the continuous portion 39a, and no gap is formed between the filler 41 at the time of closing, and good adhesion is possible. .

FIG. 11A is a perspective view of a flap portion in which the cut portion is linear, and FIG. 11B is a plan view thereof.
In the flap portion 39 </ b> C shown in FIG. 10, a single straight cut portion 37 </ b> C whose end is a round hole 65 is formed at the position of the covering sheet 23 corresponding to the connection box 33. Accordingly, in the flap portion 39C, both skirt portions 67, 67 that are the starting end side of the cut portion 37C are opened and closed on both sides. With this configuration, the cut portion 37C can be minimized and the flap portion 39C can be hardly peeled off.

Next, for the nonwoven fabric 17 integrated with the resin sheet base material 13 according to the above embodiment, nonwoven fabrics having different basis weights, thicknesses, and densities are set in a mold, filled with concrete, and cured nonwoven fabrics. The impregnation state of the concrete on the back surface was observed and evaluated according to the following criteria.
Evaluation criteria ○… Concrete filled to the back.
×: There is a portion on the back surface that is not filled with concrete.
The results are shown in Table 1.

  In the above table, “Bolance” is a trade name of a spunbond nonwoven fabric manufactured by Toyobo Co., Ltd., and “Syntex” is a trade name of a spunbond nonwoven fabric manufactured by Mitsui Chemicals, Inc.

Next, each nonwoven fabric was used as a resin base material sheet, and a soft PVC sheet was used, bonded together with an adhesive for urethane dry lamination, set in a mold, filled with concrete and cured, and then the adhesion was measured.
Example No. The adhesive strength of the base sheet laminated with the nonwoven fabrics 1 to 7 was 0.9 to 1.1 N / mm ² . The adhesive force of the base sheet laminated with 8 to 12 non-woven fabrics was 0.3 to 0.6 N / mm ² . Especially No. 9 and No. No. 10 non-woven fabric has a high density and little concrete impregnation. The 12 non-woven fabric was insufficient in thickness and could not obtain sufficient adhesion.

DESCRIPTION OF SYMBOLS 11 ... Segment main body 13 ... Resin-made sheet base material 15 ... Back surface 17 ... Nonwoven fabric 19 ... Concrete 21 ... Inner peripheral surface 23 ... Cover sheet 27 ... Opening part 29 ... One side surface 31 ... Connection surface 33 ... Connection box 35 ... Edge 37 ... notch part 39 ... flap part 41 ... filler 43 ... surface 100 ... lining segment for tunnel

Claims (5)

The segment body,
A non-woven fabric is laminated on the back surface of the resin sheet base material, and the non-woven fabric is embedded in the concrete at the time of concrete placement of the segment body, and covers a peripheral surface of at least one of the inside and outside of the segment body, and
A tunnel lining segment comprising :
A connection box in which an opening is opened in the inner peripheral surface of the segment body and embedded in the segment body, and one side surface is disposed on the connection surface of the segment body;
A flap portion that is formed at a position of the opening portion of the connection box and that allows the opening portion to be opened and closed by a cut portion cut from an edge portion of the covering sheet;
The lining segment for tunnels characterized by comprising. The lining segment for a tunnel according to claim 1,
The lining segment for tunnels, wherein the nonwoven fabric of the covering sheet has a thickness of 0.3 to 1.0 mm and a density of 80 to 160 . A lining segment for a tunnel according to claim 1 or 2,
A lining segment for a tunnel, wherein the flap portion is embedded in the filler filled in the junction box and covers the opening of the junction box. The lining segment for tunnel according to any one of claims 1, 2, and 3,
The lining segment for tunnels characterized in that the resin sheet base material of the covering sheet is colored for the inner surface color of the tunnel on the surface opposite to the back surface on which the nonwoven fabric is laminated. A lining segment for a tunnel according to claim 4 ,
The resin-made sheet base material of the said covering sheet has the uneven | corrugated | grooved part formed in the said surface, The lining segment for tunnels characterized by the above-mentioned.

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