JP2003155899A - Execution method for interior wall of tunnel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an execution method for preventing flaking of a tunnel, which can be rapidly practiced in a rational manner. SOLUTION: A flaking preventing net 3, which is predominantly composed of nylon 6 fibers and nylon 66 fibers and/or polyphenylene sulfide fibers, is stuck on an inner surface of a concrete skeleton 1, which undergoes substrate treatment. After that, fiber reinforced mortar 3 is applied at least in a thickness great enough to allow the net 3 to be buried in the mortar 3. Preferably, the net 3 is stuck in a state of being substantially floated from the inner surface of the concrete skeleton 1. A polyamide fiber is suitable for a fiber reinforced material 9. This execution method is useful for repair work for an interior wall of a railway tunnel, which is greatly restricted by time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tunnel inner wall in which a stripping prevention net is embedded to prevent the risk of stripping.
TECHNICAL FIELD The present invention relates to a tunnel inner wall construction method and a tunnel wall that are quickly and reasonably constructed. The present invention was originally aimed at repairing the inner wall of a railway or a road tunnel, especially the ceiling portion, but can be effectively used for a wide range of new tunnel inner wall construction and inner walls.

[0002]

2. Description of the Related Art A railway or road tunnel inner wall, especially a ceiling accident, may lead to a serious accident.
It is necessary to detect this in advance and repair a safe tunnel. However, these tunnels, especially railway tunnels, must be constructed quickly and reliably within a very limited time due to their characteristics, and construction must be completed so as not to interfere with train traffic. , Its restrictions are very different from other buildings such as the outer wall of a building.

A typical example of the conventional work for repairing the inner wall of the tunnel of the stripping prevention net will be explained. First, after passing the final train, defective parts such as floating of the inner wall of the tunnel are scraped off to remove the concrete skeleton surface. Wash and perform preparatory work such as primer treatment. Then, a plurality of workers press the stripping prevention net against the inner wall of the tunnel with a jig so that the slack does not come out, apply mortar to the pressed net part, and temporarily fix the net to the body. Make an anchor hole at a predetermined position on the body, insert a pin and fasten the net with a washer. Usually, the work on the first day is completed here, and it is cleaned up to watch the first train. And the second
After passing the last train on the day, mortar was applied to the required thickness to solidify and repair work was completed.

[0004]

As described above, most of the tunnel inner wall repair works are carried out according to specifications within a predetermined time, and delays cannot be tolerated. The conventional method of embedding a net to prevent exfoliation, especially the same construction method for repair, has the advantage that the exfoliation prevention effect after construction is great, but the efficiency of mobilizing a large number of workers to finish in a short time It was a bad way. The present invention has been completed as a result of studying a method capable of promptly and rationally performing construction faithful to specifications.

[0005]

In the present invention, the term "tunnel inner wall construction method" includes a repair construction method for a tunnel inner wall, and the term "tunnel inner wall" includes a tunnel inner repair wall. Also, the measurement of bending hardness is
Using a pure bending tester (KES-FB2-S: manufactured by Kato Tech Co., Ltd.), a side fiber body (yarn) of a flaking prevention net (turtle shell net) was measured as a test body to obtain an average value.

The present invention will be described with reference to the drawings. As a tunnel inner wall construction method for solving the above problems, the present invention mainly comprises nylon 6 fibers, nylon 66 fibers, and / or
Alternatively, there is provided a method for constructing an inner wall of a tunnel, which comprises applying a stripping prevention net 3 made of polyphenylene sulfide fiber, and then applying the fiber reinforced mortar 2 at least to a thickness at which the net is buried. It is desirable that the stripping prevention net 3 be substantially floated from the inner surface of the concrete skeleton 1 and attached thereto. Preferably, the anchor pin 4 is attached to a predetermined position on the inner surface of the concrete skeleton 1, and the stripping prevention net 3 is attached thereto. Floating from the body surface with the spacer 6 sandwiched between them, it is fixed and attached. By sandwiching the spacer 7, it may be sandwiched if necessary to prevent the inner wall of the tunnel and the net from sticking together when the mortar is sprayed.

As the stripping prevention net 3 to be attached,
Maximum mesh size and pitch are both 10-200m
Those formed within the range of m are preferable. In addition, the total fineness of the fibrous body forming one side of the mesh is 1,000 to 6
The preferred range is 10,000 dtex, and the bending hardness of the fibrous body constituting one side of the mesh is 100 to 1,000 gf.
・ A value within the range of cm / yarn is preferable. The bending hardness may be given by processing a resin. It is desired that the flaking prevention net be flameproofed for safety.

The fiber reinforcing material 9 to be mixed with the fiber reinforced mortar 2 has a single yarn fineness of 4 to 50 dtex and a fiber length of 3 to 2.
Those in the range of 5 mm are suitable, and preferably,
Polyamide fiber is added to 100 parts by weight of cement.
It is mixed in the range of 1 to 1 part by weight.

The present invention further includes a concrete skeleton 1,
Fiber-reinforced mortar layer 2 laminated on the inner surface side (A) of the concrete body, mainly nylon 6 fiber, nylon 66
Provided is an inner wall of a tunnel, characterized in that a stripping prevention net 3 made of fibers and / or polyphenylene sulfide fibers and a fiber-reinforced mortar layer 2 are made in the above order. A polyamide-based reinforcing fiber is suitable for the fiber reinforcing material 9 that is mixed with the fiber-reinforced mortar layer.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view illustrating an inner wall of a tunnel according to the present invention.

In the tunnel inner wall construction method of the present invention, first, as in the conventional construction method, the concrete skeleton 1 is subjected to a base treatment using a primer or the like. In the case of repair work, a defective portion of the inner wall, for example, a raised mortar or the like is scraped off, the construction surface is washed with water, and a base treatment is performed.

Next, a stripping prevention net 3 is attached to the surface of the concrete skeleton 1 which has been subjected to the base treatment. In the tunnel inner wall construction method of the present invention, it is desirable that the anti-stripping net 3 is not attached in contact with the body 1 but is attached in a substantially floating state. Especially the concrete frame 1
It is useful for repairing the inner wall where a part of it has been removed. Fiber-reinforced mortar 2 on the back of the stripping prevention net 3.
1 surface with a lot of unevenness and the entire mortar layer 2
It is possible to strengthen the adhesion of the mortar layer 2 and strengthen the mortar layer 2 by comprehensively strengthening the mortar layer 2 by incorporating the stripping prevention net 3 into the mortar layer 2 and connecting and integrating the reinforcing fibers 9 into a plate shape. Although it depends on the surface state of the skeleton 1, it is usually about 3 to 10 mm, preferably 5 to 10 on average from the skeleton 1.
It is recommended to float within the range of mm. In addition, "substantially"
Is intended to exclude cases where the surface of the concrete skeleton 1 is so uneven that it is difficult to make it float on a part of the net during repair work.

In the present invention, nylon 6 is mainly used.
Anti-stripping net 3 made of fiber, nylon 66 fiber, and / or polyphenylene sulfide fiber
To use. This is because the nylon fiber has hydrophilicity and water retention, good affinity with mortar 2, good alkali resistance, and self-extinguishing property. Further, the polyphenylene sulfide fiber has high strength and rigidity and is flame-retardant, so that it can be used with confidence.

There is no particular limitation on the mesh shape of the anti-stripping net 3, but a hexagonal mesh is preferable from the viewpoint of shape retention characteristics. Further, the maximum inner size and pitch of the mesh largely depend on the length of the fiber reinforcing material 9 to be used, and the fiber reinforced mortar 2 to be applied easily enters the back side of the net 3, that is, the concrete skeleton 1 side by one application. It is usually 10-200m so that it can be entangled and partly entangled with the net 3.
Knitting may be performed within a range of about m, preferably within a range of 50 to 150 mm.

As the fibrous body for knitting the net 3, those having a total fineness in the range of 1,000 to 60,000 dtex are generally used, but preferably 3,000 to 50,000.
It is within the range of 0 dtex. 1,000 dt
If it is less than ex, the rigidity will be too small and it will be difficult to construct.
When it exceeds 0000 dtex, the cost of the raw yarn increases and the yarn becomes too thick and difficult to knit. The fibrous body may be a multifilament or a monofilament as long as it has an appropriate bending hardness. Further, if a loop is formed in the fibrous body, the loop on the side of the body 1 can more reliably lift the net 3 out of the body 1, and the loop on the opposite side can obtain an anchor effect to the mortar 2. it can.

Further, it is desirable that the anti-stripping net has an appropriate bending hardness, and if necessary, it may be subjected to resin processing to give the bending hardness. PVA for resin processing,
Resins such as melamine, polyester, acrylic ester, and epoxy are used. If the bending hardness is low, the net hangs down, which makes it difficult to fix the net, apply mortar, and perform other constructions, and may be entangled with the panda graph of the train running, which is dangerous. If it is too high, it will be difficult to construct, and it may be broken or wrinkled and become a weak point.

Although there is a difference in the shape and size of the mesh, in the case of the hexagonal shape, the flexural hardness of the fibrous body constituting the mesh is preferably in the range of about 100 to 1,000 gf · cm / yarn, and 200 to It is suitable if it is within the range of 700 gf · cm / yarn. 100 when resin processed
If it is less than gf · cm / yarn, the rigidity is insufficient and the net tends to hang down. 1,000 gf · cm / y
If the hardness is more than arn and is too hard, it may be broken or wrinkled during handling during construction, which may be a weak point. The net made of monofilament is less likely to bend even if the bending rigidity is higher than the above value. In the case of other mesh shapes, it may be considered in accordance with the hexagonal shape. Bending hardness is considerably larger than conventional stripping prevention nets, but there is little slack in sticking and workability is good, so it is particularly advantageous for speeding up repair work and safety of train running can be achieved. .

The flameproof treatment is to prevent ignition from sparks of the Pandagraph, and a flameproofing agent may be added to the fiber raw material, but since it may lower the fiber strength, it may cause a decrease in fiber strength. Good to give. The flameproofing agent can be appropriately selected and used from bromine-based, phosphorus-based, thiourea-based, inorganic / composite-based agents and the like.

There are various methods for attaching the anti-stripping net, such as a method using an adhesive and a method using an adhesive mat. However, it is preferable to use the anchor pin 4 which enables reliable and quick construction. The anchor pin 4 is preferably made of stainless steel. FIG. 1 shows a concrete example of an anchor pin 4 fixed to a concrete skeleton 1 and having a net 3 attached thereto. If the net 3 having the above bending hardness is used, it is often sufficient to use one at each apex of 1 m square and one at the center.

After the exfoliation prevention net is attached, mortar is applied to a thickness of at least about the surface of the mortar, generally about 30 mm. In the present invention, in order to improve the strength and impact resistance of the mortar and prevent peeling, a fiber-reinforced mortar mixed with a fiber reinforcement is applied. By using the fiber reinforced mortar, a stripping prevention net having a large maximum mesh size and a large pitch can be used, so that the weight of the net can be reduced, the workability can be reduced, and the cost can be reduced. In the case of the inner wall of the tunnel, the spraying method, which is advantageous for automation, is exclusively used as the coating means, but it is not limited to this.

The fiber reinforcing material to be mixed has a single yarn fineness of 4 to 5
Within the range of 0 dtex, preferably within the range of 8 to 25 dtex, and the fiber length is within the range of 3 to 50 mm, preferably 10 to 2.
Those within the range of 5 mm are used. Single yarn fineness is 4 dtex
If it is less than the above range, the dispersion in the mortar becomes non-uniform, the fiber balls are easily produced, and the reinforcing effect of the mortar may not be sufficiently obtained. On the other hand, when it exceeds 50 dtex, the adhesion area with the mortar decreases and it becomes difficult to sufficiently exhibit the bonding effect. If the length is less than 3 mm, the adhesive length with the mortar may be insufficient and the required reinforcing effect may not be obtained. If it exceeds 50 mm, the dispersibility in the mortar deteriorates, the workability deteriorates, and the number of fibers entangled in the net increases, so that the mortar does not sufficiently go around the back surface of the net. In addition, the elongation is 15% or more,
The tensile strength is preferably 3 cN / dtex or more. Further, the modified cross-section yarn can be preferably used in the fiber-reinforced mortar according to the present invention.

As the fiber reinforcing material used in the tunnel construction of the present invention, a polyamide fiber reinforcing material has alkali resistance, moderate water absorption and hydrophilicity as compared with other fiber reinforcing materials, and has tensile strength and elongation. It is most suitable because it has a large size, is highly tough, has excellent dispersibility in mortar, is easily compatible with mortar, and has good workability. Polyamide fibers include polyamide fibers made of polyamide or mainly containing polyamide. Among them, so-called nylon fibers are preferably used. For nylon,
Nylon 6, nylon 66, highly shrinkable copolymer nylon,
Flexible copolymer nylon and the like are preferable. The appropriate amount of the polyamide-based fiber reinforcing material to be mixed is usually 0.1 to 1 part by weight with respect to 100 parts by weight of cement. If necessary, a quick-setting agent (sodium aluminate, sodium carbonate, etc.) can be added to the fiber-reinforced mortar used in the present invention.

[0023]

Example 1 A total fineness of 1,400 dte was measured by a double Russell knitting machine.
x, the number of nylon 6 multifilaments with 204 filaments is 3 aligned and the nylon 6 monofilament with 935 dtex is one fiber body, and the maximum inner dimension is 6
0 mm, mesh pitch 50 mm, loop height 6 mm
The knitted eye net with a loop is knitted. 35% melamine resin, 15% thiourea flame retardant,
A 50% aqueous solution was impregnated with water and heat set at 170 ° C. for resin processing. The bending hardness of the fibrous body constituting one side of the mesh was approximately 280 gf · cm / yarn, although there was a slight difference depending on the measurement site. Next, on the construction part of the inner wall of the tunnel after the groundwork treatment, anchor pins of the same shape as shown in FIG.
Books were arranged and attached, and the above net was floated from the surface of the body by about 5 mm and attached to one surface. Since it is a net with loops, the fibrous body of the tunnel body and the net body did not stick together. Since the net is solid, it was very easy to work with.

After the net was attached, nylon 6 fiber having a single yarn fineness of 6 dtex, a fiber length of 15 mm, a tensile strength of 5.5 cN / dtex and an elongation of 20% was used as a fiber reinforcing material, and the ratio of cement to cement was 0. 4.5% by weight of a quick-setting agent (inorganic aluminate) was added to the fiber-reinforced mortar mixed so as to be 5% by weight and sprayed to a thickness of about 30 mm. In the mortar, the added reinforcing fiber was surely and uniformly entered the back surface of the net without being separated. The labor time at the construction site was about 40%, which was very efficient compared to the conventional construction method using ordinary mortar.
No problems have occurred after the construction.

Example 2 Using a net-making machine, a nylon 6 monofilament of 45,000 dtex having a maximum inner dimension of 60 mm and a pitch of 50 mm was used.
I organized the turtle shell net. The bending hardness of the fibrous body constituting one side of the mesh of the knitted net is approximately 6 in the state as it is.
It was 70 gf · cm / yarn. The resin was not applied to this net, and the net was attached to the portion of the inner wall of the tunnel where the base treatment had been completed in the same manner as in Example 1. The crossing portion of the mesh was thick, and it had an action of forming an appropriate gap between the net and the skeleton, and the net itself had an appropriate rigidity, and the above work was easy to perform. After sticking the net,
Mortar was sprayed in the same manner as in Example 1. In the mortar, the added reinforcing fiber was surely and uniformly entered the back surface of the net without being separated. The labor time at the construction site was about 40%, which was very efficient compared to the conventional construction method using ordinary mortar.

[0026]

By utilizing the present invention, the concrete skeleton, the fiber reinforced mortar and the anti-stripping net are integrally connected through the fiber reinforcing material to prevent the inner wall of the tunnel from spalling. In addition, by using a stripping prevention net that focuses on the construction of the inner wall of the tunnel, especially the ceiling part, the on-site construction time is shortened, and it has a remarkable effect in accelerating the repair work of the inner wall of the railway tunnel, which has many restrictions. .

[Brief description of drawings]

FIG. 1 is a cross-sectional view illustrating a tunnel inner wall according to the present invention.

[Explanation of symbols]

A: Inside the tunnel 1: Concrete skeleton 2: Fiber reinforced mortar 3: Stripping prevention net 4: Anchor pin 5: Washer (holding net) 6: Spacer 7: Spacer 8: Filling adhesive 9: Fiber reinforcement

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Joe Honda             1-1 1-1 Oe, Otsu City, Shiga Prefecture             Ceremony company Seta factory (72) Inventor Akira Miyamoto             1-1 1-1 Oe, Otsu City, Shiga Prefecture             Ceremony company Seta factory (72) Inventor Shigeru Aoki             2-15-2 Konan, Minato-ku, Tokyo Co., Ltd.             Obayashi Tokyo Main Office (72) Inventor Sekinori Kubo             2-15-2 Konan, Minato-ku, Tokyo Co., Ltd.             Obayashi Tokyo Main Office (72) Inventor Haruka Ogawa             4-640 Shimoseido, Kiyose City, Tokyo Stocks             Company Obayashi Technical Research Institute F term (reference) 2D055 DB00 DB09 KB07 KB11 LA16                       LA17                 2E176 AA01 BB29

Claims (12)

[Claims] 1. A method for constructing an inner wall of a tunnel, wherein a stripping prevention net mainly composed of nylon 6 fiber, nylon 66 fiber, and / or polyphenylene sulfide fiber is provided on the surface of a concrete skeleton subjected to a surface treatment. A method for constructing an inner wall of a tunnel, which comprises applying the fiber-reinforced mortar to a thickness such that at least the net is buried after being attached. 2. The method for constructing an inner wall of a tunnel according to claim 1, wherein the stripping prevention net is substantially floated from the concrete body surface and attached. 3. An anchor pin is attached to a predetermined position on the inner surface of the concrete skeleton, and a stripping prevention net is fixed and affixed to the inner surface with a spacer interposed therebetween. Tunnel inner wall construction method. 4. The maximum inner size and pitch of the mesh are both 1
The method for constructing an inner wall of a tunnel according to any one of claims 1 to 3, wherein a stripping prevention net formed within a range of 0 to 200 mm is attached. 5. The total fineness of the fibrous body constituting one side of the mesh is
A stripping prevention net within the range of 1,000 to 60,000 dtex is attached, and
The tunnel inner wall construction method according to any one of 4 above. 6. A peeling-preventing net having a bending hardness of 100 to 1,000 gf · cm / yarn of the fibrous body constituting one side of the mesh is attached. The tunnel inner wall construction method according to any one of 1. 7. A peeling-preventing net, which has been subjected to resin processing to give bending hardness, is attached.
6. The tunnel inner wall construction method according to any one of 6. 8. The method for constructing an inner wall of a tunnel according to any one of claims 1 to 7, characterized in that a flaking prevention net at least subjected to flameproofing is attached. 9. A single yarn fineness of 4 to 50 dtex and a fiber length of 3
The method for constructing a tunnel inner wall according to any one of claims 1 to 8, characterized in that a fiber-reinforced mortar mixed with a fiber reinforcing material within a range of -25 mm is applied. 10. A fiber-reinforced mortar containing 100 parts by weight of cement mixed with 0.1 to 1 part by weight of polyamide fiber is applied, and the fiber-reinforced mortar according to claim 1 is applied. Tunnel inner wall construction method. 11. A concrete skeleton (1), a fiber-reinforced mortar layer (2) laminated on the inner surface (A) of the concrete skeleton, and mainly composed of nylon 6 fiber, nylon 66 fiber, and / or polyphenylene sulfide fiber. An inner wall of a tunnel, characterized in that the stripping prevention net (3) and the fiber-reinforced mortar layer (2) are formed in the above order. 12. The tunnel inner wall according to claim 11, wherein the fiber reinforcing material (9) mixed in the fiber-reinforced mortar layer is a polyamide-based reinforcing fiber.