JP4094895B2 - Tunnel lining segment and its backfill bag - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
In the present invention, when a tunnel is constructed by a shield construction method, a segment is arranged along the inner surface of the excavated tunnel ground to form a lining, and a segment for backfilling between the lining and the natural ground, and This relates to the backfill bag.
[0002]
[Prior art]
When constructing a tunnel using the shield method, a lining is formed by arranging a number of segments along the inner surface of the excavated tunnel ground, and a grout material is filled between the lining and the ground to harden it. To stabilize the segment and prevent loosening of the ground due to the skin fall of the ground.
[0003]
However, in this method, the filled backfilling material may move forward in front of the shield machine, which may adversely affect the cutting blade cutter and the soil transport conveyor. Therefore, by attaching a cloth bag body to the segment and press-fitting the backfill material into the bag body, the segment is fixed without the backfill material flowing excessively.
[0004]
In these methods, in order to hold the bag body in the segment and prevent the bag body from being damaged by the brush of the shield machine, the outer side of the bag body on the back surface of the segment is covered with some lid or cover. It is necessary.
[0005]
As such a structure, Japanese Patent Application Laid-Open No. 11-193692 discloses that a concave portion is formed on the back surface of a segment body, a bag made of a cylindrical fabric is folded flat, and the bag folded flat is further in the width direction and length. Fold in the direction, hold the bag in a folded state, and form a bag body that can be easily broken by applying an internal pressure to the bag so that the bag body is exposed on the back surface. Describes a structure fitted in the recess.
[0006]
[Problems to be solved by the invention]
However, in such a structure, it is very difficult to select the material of the covering material. That is, in order to protect the bag body from the brush of the shield machine, the covering material needs a considerable thickness and strength. On the other hand, in order to be able to be easily broken by applying an internal pressure to the bag body, it is necessary that the strength is low and conflicting performance is required.
[0007]
The present invention has been made in view of such circumstances, and the bag body is protected and not damaged by the brush, and when the internal pressure is applied to the bag body, the covering material is easily broken, and the bag body It is an object of the present invention to provide a tunnel lining segment and a bag body for backfilling the segment, which can surely expand and backfill.
[0008]
[Means for Solving the Problems]
Thus, the segment of the present invention forms a recess in the back surface of the segment main body arranged along the inner surface of the excavated tunnel ground, and folds the bag made of a cylindrical fabric into a flat shape. The folded bag is further folded in the width direction and the length direction, and the folded bag is covered with a covering material having water permeability formed by partially binding granular materials with an elastic binding material to form a bag body. The bag body is fitted into the recess so that the coating is exposed on the back surface, and a pressure inlet is formed through the segment body to press-fit a backfill material into the bag. Is.
[0009]
The segment backfill bag of the present invention is attached to the back surface of the segment body arranged along the inner surface of the excavated tunnel ground, and is expanded by press-fitting backfill material into the segment body. In the backfill bag body that fills and seals the space between the main body and the natural ground, the bag made of a cylindrical fabric is folded flatly, and the bag folded into the flat shape is further expanded in the width direction and the length direction. Folded, and at least one surface of the folded bag is coated with a water-permeable covering material in which a granular material is partially bonded with an elastic bonding material.
[0010]
In the present invention, the granular material is preferably made of an elastic material such as rubber. Moreover, it is preferable to use what grind | pulverized the waste tire as the elastic material. The average particle size of the granular material is suitably 0.1 to 5 mm.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a segment 1 for tunnel lining according to the present invention. In the said segment 1, 2 is a segment main body, Comprising: The thing made from concrete is shown in drawing.
[0012]
The segment body 2 has a substantially arcuate shape along the inner surface of the tunnel to be constructed, and these segment bodies 2 are connected to form a tunnel inner wall having a circular cross section.
[0013]
And the recessed part 3 is formed in the back surface of the segment main body 2, ie, the surface facing the ground of a tunnel, The bag body 4 for backfilling of this invention is fitted in the said recessed part 3 Yes.
[0014]
In the backfill bag 4, 5 is a bag made of a tubular fabric. As shown in FIG. 2 (a), the bag 5 is made of a cylindrical fabric having both ends 6 open, which has a length approximately equal to or slightly longer than the length of the segment body 2.
[0015]
And as shown in FIG. 2 (b), a part of the bag 5 is tapped inward at both ends to form a shortened portion 7 and folded in the length direction. The length is reduced to a length that can be fitted into the recessed portion 3.
[0016]
Further, as shown in FIG. 2 (c), the bag 5 is folded back in the width direction, the side edges 8 are butted in the center, folded in a double-folded manner, and fitted into the recessed portion 3 of the segment body 2. Reduce to the width you want.
[0017]
The bag 5 folded in this manner is preferably partially stitched with a weak thread or partially bonded and temporarily secured so that the folded state does not open and return to its original state, and the folded state is maintained. .
[0018]
And the terminal part which protruded from the shortening part 7 of the bag 5 is folded back, and the both ends 6 are closed by sewing. An opening 9 is formed on the lower surface of the bag 5, and a pressure inlet 10 made of a tubular fabric is sewn into the opening 9 to form a backfilling material injection port.
[0019]
Thereafter, the back cover bag 4 is formed by covering the upper surface of the bag 5 folded in this manner with the covering material 11. In the present invention, as the covering material 11, a material in which granular materials are partially bonded with an elastic bonding material is used.
[0020]
As the granular material, rubber, soft plastic, relatively hard sponge, and the like are suitable, and it is preferable to use those obtained by pulverizing them to a particle size of about 0.1 to 5 mm. In particular, from the viewpoint of resource reuse, it is preferable to use a crushed waste tire.
[0021]
The granular material is preferably an elastic material such as rubber as described above, but is not necessarily limited thereto, and hard plastic, wood chips, fibers, crushed stone, sand, gravel, cement waste, etc. are used. It is also possible.
[0022]
Next, the elastic binder that hardens these granular materials is preferably one obtained by curing a resin liquid having adhesiveness such as soft polyurethane. The soft polyurethane resin may be a two-pack curable type, but it is preferable to use a one-pack type that cures by reacting with moisture in the air.
[0023]
In addition to polyurethane, a reactive curable resin such as soft unsaturated polyester resin or epoxy resin may be used as the elastic binder, and latex of rubber or vinyl resin may also be used.
[0024]
The ratio of the granular material to the elastic binder is based on the type and shape of the granular material, and the porosity when filled, but the weight ratio of the granular material is 100, and the elastic binder is about 5-50. Is appropriate.
[0025]
When there is too little quantity of an elastic binder, the coupling | bonding of the granular materials by an elastic binder will be inadequate, and the intensity | strength of the coating | covering material 11 will run short. Moreover, when there is too much quantity of an elastic binder, the coupling | bonding strength of granular materials will become large too much, and when the bag 5 swells, the coating | covering material 11 may not burst.
[0026]
Moreover, it is preferable that the elastic binder does not fill the voids of the granular materials, and the covering material 11 has air permeability through the voids between the granular materials. Also in this sense, it is appropriate that the ratio of the granular material and the elastic binder is approximately 100: 5 to 50 as described above.
[0027]
In order to mold the backfill bag body 4, a mold frame having a size substantially equal to or slightly smaller than the size of the recessed portion 3 of the segment body 2 is prepared, and the bag 5 folded in the mold frame is prepared. Place and inject the mixture of the granular material and the elastic binder so as to cover the bag 5 in the formwork, smooth the surface, and compress and heat as necessary to solidify the elastic binder. . At this time, the backfilling bag body 4 can be molded as a flat one without considering the curvature of the segment body 2.
[0028]
【Example】
A recess 3 having a length of 1950 mm, a width of 272 mm, and a depth of 25 mm was formed on the back surface of the concrete segment body 2 having a length of 2000 mm, a width of 300 mm, a thickness of 155 mm, and a curvature of 83 degrees.
[0029]
A bag 5 made of a cylindrical woven fabric having a length of 5600 mm and a diameter of 300 mm is folded flat, and further folded in the length direction and width direction as shown in FIG. A folded bag 5 having a thickness of 242 mm and a maximum thickness of 18 mm was formed, an opening 9 was formed in the center of the lower surface thereof, and the pressure inlet 10 was sewn. In addition, the bag 5 was partially temporarily fixed with an adhesive so as not to open from the folded state.
[0030]
A flat mold having an inner length of 2000 mm, a width of 272 mm, and a depth of 45 mm was formed, and the folded bag 5 was accommodated in the mold so that the pressure inlet 10 was down.
[0031]
On the other hand, the fibers were removed from the pulverized material of the waste tires, and those passing through a 5 mm mesh were used as the granular material. The tensile strength of the granular material was about 200 kgf / cm ² , and the elongation at break was about 400%.
[0032]
A one-component moisture-curable polyurethane resin solution was used as an elastic binder. The elastic binder had a tensile strength after curing of 76 kgf / cm ² , an elongation at break of 120%, a Shore A hardness of 87 degrees, and a tear strength of 40 kgf / cm.
[0033]
700 parts by weight of the granular material and 100 parts by weight of the elastic binder are mixed by stirring for 10 minutes with a planetary stirrer, and the mixture is poured onto the bag 5 in the mold, I spread it all over the height. While compressing by applying a load of 15 kgf / cm ² from above, the elastic binder was cured at normal temperature (20 ° C.), and the backfill bag 4 was molded. The thickness of the molded product was 25 mm including the bag.
[0034]
The cut covering material 11 from the back-filling bag body 4 is molded was measured its physical properties, tensile strength is 3.5 kgf / cm ^2, elongation at an elongation of 40%, tear strength 2 kgf / cm met It was.
[0035]
[Action]
The backfilling bag body 4 of the present invention is formed by covering a folded bag 5 with a covering material 11, and the covering material 11 is formed by partially binding granular materials with an elastic binding material. It can be handled as a single article and fits into the recess 3 of the segment body 2 to form the segment 1 of the present invention. Further, the pressure inlet 10 sewn in the opening 9 of the bag 5 is inserted into the through hole 12 formed in the segment body 2.
[0036]
At this time, the bag 5 is made of soft fibers, and the covering material 11 is formed by partially binding a granular material with a soft elastic binder and has flexibility. 4 has flexibility as a whole, and can be formed into a flat shape by bending it according to the bending of the segment body 2 and fitting into the recessed portion 3.
[0037]
In this state, the segment 1 is assembled inside the ground of the tunnel excavated by the shield excavator to construct the inner wall of the tunnel. At this time, the back surface of the backfill bag 4 is rubbed by the tail brush of the shield excavator, but the rubbed material is the granular material in the covering material 11, and the granular material has high wear resistance. Because it is not severely damaged.
[0038]
Moreover, although it is possible that a part of granular material in the covering material 11 falls off due to strong friction, such damage does not reach the inside, and at least the damage does not reach the bag 5.
[0039]
Thus, after the segment 1 is assembled, the grout material 16 is press-fitted from the inside of the segment 1 through the pressure inlet 10. Moisture contained in the grout material 16 exudes from the bag 5 and further, when the covering material 11 has air permeability, it exudes through the covering material 11 and the density of the grout material 16 in the bag 5 increases.
[0040]
Further, as shown in FIG. 4, the bag 5 near the opening 9 is inflated by the pressure of the grout material 16, and both sides of the bag 5 folded on the upper surface are pushed open to the side, and the distance between the side edges 8 is widened.
[0041]
As a result, a lateral tension acts on the covering material 11 along the abutting portions of the side edges 8 of the bag 5, and the tears 13 are generated and split as the distance between the side edges 8 increases. At this time, the covering material 11 has a structure in which the granular material is bonded with a small amount of elastic binding material, and the covering material 11 itself has a low tensile strength and tear strength, so that it can be easily applied with pressure when the grout material 16 is press-fitted. It tears.
[0042]
If the covering material 11 is torn, the bag 5 is further inflated while further pressing the grout material 16 to push open the separated separation piece 14. At this time, the separation piece 14 pushed open is interposed between the bag 5 and the corner portion 15 of the recessed portion 3 of the segment body 2, and the bag 5 is prevented from being rubbed and damaged.
[0043]
Then, the folding of the bag 5 in the width direction is released, the shortening portion 7 is also pushed out by the pressure of the grout material 16 and is also unfolded and extended in the length direction, and the bag 5 is as shown in FIGS. The bag 5 which swells and is filled with the grout material 16 backs the space between the segment body 2 and the ground 17.
[0044]
【The invention's effect】
Therefore, according to the present invention, the backfilling bag body 4 is folded in a small size and the folded state is maintained by the covering material 11, so that the backfilling bag body 4 is not combined with the segment body 2, Can be handled alone.
[0045]
Further, the segment body 2 has a simple structure simply by forming the recessed portion 3 and the through hole 12 for attaching the backfill bag body 4, so the segment body 2 and the backfill bag body 4 in the present invention are attached. The segment 1 of the present invention can be made by attaching the backfill bag 4 of the present invention to the single segment body 2 as necessary at the construction site, without the need to make a distinction from a segment that is not present, Management of materials is easy.
[0046]
In the segment 1 in which the backfilling bag body 4 is attached to the segment body 2, the backfilling bag body 4 is exposed on the back surface of the segment 1, but the outside of the bag 5 is covered with the covering material 11. Therefore, the bag 5 is protected by the covering material 11, and the bag 5 is not damaged by directly contacting the natural ground 17 or being rubbed by the tail brush of the shield excavator.
[0047]
Thus, when the grout material 16 is press-fitted into the bag 5, the covering material 11 is broken and the bag 5 is allowed to expand. A backfill can be formed. At this time, the lid and the sheet do not fall off as in the conventional method, and they do not fall and partially obstruct the formation of the backfill.
[0048]
Further, in the present invention, since the covering material 11 is formed by partially bonding the granular material with an elastic binder, the granular material having excellent physical properties bears against external force such as friction and effectively protects the bag 5. can do. Moreover, since the covering material 11 is not a lump, the shield excavator is not damaged.
[0049]
And since the whole intensity | strength and flexibility of the coating | covering material 11 are based on the physical property of the elastic binding material which couple | bonded the granular material, and the ratio in the coating | covering material 11 of the said elastic binding material, the intensity | strength of the coating | covering material 11 is reduced significantly. Thus, the covering material 11 can be easily torn by the pressure of the grout material and the bag 5 can be inflated.
[Brief description of the drawings]
1A and 1B show a segment of the present invention, in which FIG. 1A is a central longitudinal sectional view and FIG. 1B is a transverse sectional view.
FIG. 2 is a partial plan view showing a process of folding a bag. FIG. 3 is a central longitudinal sectional view of a terminal portion of the bag in the present invention. FIG. 4 shows a state in which grout material is press-fitted into the bag in the segment of the present invention. Cross-sectional view showing [Fig. 5] Cross-sectional view showing a state of being backfilled with the segment of the present invention [Fig. 6] Center vertical cross-sectional view showing a state of being backfilled with the segment of the present invention
DESCRIPTION OF SYMBOLS 1 Segment 2 Segment main body 3 Recessed recessed part 4 Back filling bag body 5 Bag 10 Pressure inlet 11 Cover material 16 Grout material 17 Ground

Claims (8)

Forming a recessed portion (3) on the back surface of the segment body (2) disposed along the inner surface of the ground (17) of the excavated tunnel, and folding the bag (5) made of a tubular fabric into a flat shape; The flatly folded bag (5) is further folded in the width direction and the length direction, and the folded bag (5) is partially covered with a granular material by a binding material having elasticity. A backfill bag body (4) is formed by covering the material (11), and the backfill bag body (4) is formed in the recessed portion (3) so that the cover material (11) is exposed on the back surface. A tunnel lining segment characterized by forming a pressure inlet (10) that fits and penetrates the segment body (2) and press-fits a grout material (16) into the bag (5).   The tunnel lining segment according to claim 1, wherein the granular material is made of an elastic material such as rubber.   The segment for tunnel lining according to claim 2, wherein the granular material is obtained by pulverizing waste tires.   4. The tunnel lining segment according to claim 1, wherein the granular material has an average particle diameter of 0.1 to 5 mm. The segment body (2) is attached to the back surface of the segment body (2) arranged along the inner surface of the excavated tunnel ground (17), and is expanded by press-fitting grout material (16) into the segment body (2). In the backfilling bag body (4) that fills and seals the space between the ground and the mountain (17), the bag (5) made of a tubular fabric is flatly folded, and the bag (5 ) Is further folded in the width direction and the length direction, and at least one surface of the folded bag (5) is coated with a water-permeable covering material (11) in which the granular material is partially bonded with an elastic bonding material. Back lining bag for tunnel lining segments   The back lining bag for a tunnel lining segment according to claim 6, wherein the granular material is made of an elastic material such as rubber.   The back lining bag body for a tunnel lining segment according to claim 7, wherein the granular material is a product obtained by pulverizing a waste tire.   The bag body for backfilling of a segment for a tunnel lining according to claim 6, 7 or 8, wherein an average particle diameter of the granular material is 0.1 to 5 mm.

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