JP4382029B2 - Method for repairing the inner surface of concrete canal - Google Patents

Description

The present invention relates to a repair method for repairing by applying a reinforcing coating material on the inner surface of a concrete water channel.

  As shown in FIG. 1, in the concrete canal used as an irrigation facility for paddy fields, the inner surface of the concrete canal 1 in contact with the water flow is significantly damaged and deteriorated. However, for those that are relatively light, from the viewpoint of cost reduction and environmental burden reduction, an existing concrete waterway is repaired and the life is extended without renovation.

  Conventionally, as shown in FIG. 1, the inner surface repair method of the concrete water channel 1 is applied with polyurethane resin paint or epoxy resin paint on the inner surface of the bottom wall 2 and the left and right rising walls 3 of the concrete water channel for reinforcement. A method of forming the coating material layer 4 is employed.

  This construction method includes a substrate preparation step in which the inner surface of the bottom wall 2 of the concrete water channel 1 and the inner surfaces of the left and right rising walls 3 are washed with high-pressure water and dried with a gas burner, a primer coating step on the substrate-adjusted surface, This is a method of forming the reinforcing coating material layer 4 through an undercoating and overcoating process in which a polyurethane resin paint or an epoxy resin paint is overcoated by performing uneven adjustment by mortar application as necessary.

  Thus, the polyurethane resin paint or epoxy resin paint has the advantages of being thickly coated, excellent in quick drying, and excellent in impact resistance, so that it can be applied to the water channel inner surface repair material, that is, the reinforcing coating material applied to the water channel inner surface. As widely used.

  However, the concrete forming the irrigation channel has water permeability, and as shown in FIGS. 1 and 2, the irrigation water 6 stretched on the large paddy field 5 is caused by the water pressure P and the rising wall 3 and the bottom of the concrete channel 1. There is a problem that the permeated water 7 gradually penetrates into the wall 2, and the swelling 8 of the reinforcing coating material layer 4 is peeled off by the polyurethane resin paint or the epoxy resin paint, thereby reducing the repair effect.

Thus, as a means for solving the above-mentioned problems, the present invention provides a method for repairing the inner surface of the concrete water channel. In the surface concrete, the inner surfaces of the bottom wall and the left and right rising walls that define the water channel and the upper surface of the left and right rising walls are defined. Are removed continuously, while per cubic meter,
Cement 300-600kg,
(Portland cement as a representative example),
600-1200 kg of sand,
10 to 120 kg of polymer resin,
Reinforced resin fiber 10-60kg,
It was composed primarily, and prepared the reinforcing resin fiber as blended focusing fibers focused onto the weakly adhered flat with an adhesive and formed by kneading reinforcing resin fiber filled polymer cement mortar, the reinforcing resin fiber filled polymer cement A method for repairing the inner surface of a concrete water channel, in which mortar is applied to each inner surface of the bottom wall and the left and right rising walls and to the surface concrete removal surface area of the upper end surface of the left and right rising walls to form a reinforcing coating material layer. is there.

  As the reinforcing resin fiber, a vinylon fiber having a fiber length of 5 to 20 mm and a thickness of 10 to 200 μm, or the same polyethylene fiber, or a mixed fiber of the same vinylon fiber and the same polyethylene fiber is used.

  Further, a synthetic resin mesh covering the surface concrete removal surface area is embedded in a reinforcing coating material layer made of the polymer cement mortar containing the reinforcing resin fibers, and an entangled structure of the mesh and the reinforcing resin fibers is formed.

The present invention As described above, by applying the reinforcing coating material on the inner surface of the concrete canal which is used as irrigation facilities paddy promote repair relates to the inner surface repairing method of concrete canal, in the repair method Remove the concrete on the bottom wall and the inner surfaces of the left and right rising walls and the upper end surface of the left and right rising walls , and apply the polymer cement mortar containing reinforcing resin fibers composed of the above composition to the removed surface area. This is a repairing method for forming the reinforcing coating material layer. By this repairing method , a very robust and durable reinforcing coating material layer can be formed on the inner surface of the concrete channel.

  The above-mentioned polymer cement mortar containing reinforcing resin fibers gives the reinforcing coating material layer significant strength and high toughness, and the cement mortar is rich in the composition, so it is good for the concrete wall forming the concrete water channel. It is rich in habituation and can be firmly joined to the concrete wall of the irrigation canal.

  In particular, the conventional repair method has a basic idea of repairing by forming a hard coating material layer that is hard and impermeable to water on the inner surface of a concrete water channel. Because it is a mortar repair material with a rich composition of sand, it has the property of permeating and dispersing moisture, and the irrigation water in the paddy field that has penetrated through the bottom wall and the rising wall that define the irrigation channel is a polymer containing reinforcing resin fibers The feature of allowing the reinforcing coating material layer formed by the cement mortar to permeate is given, thereby drastically eliminating the problem of swelling and peeling of the reinforcing coating material layer due to the pressure of the permeating water. A strong and durable reinforcing coating material layer can be formed on the inner surface of the concrete water channel.

The best mode for carrying out the method for repairing the inner surface of a concrete water channel according to the present invention will be described below with reference to FIGS. The concrete water channel 1 basically has a concrete bottom wall 2 and a concrete rising wall 3 raised from the left and right side edges of the bottom wall 2 and has a structure that defines a U-shaped water channel. ing. In the case of the open-type water channel 1, the upper surface is constructed in an open state, and in the case of the closed-type water channel 1, the open surface is covered with a concrete lid, or the U-shaped water channel main body is integrally provided with a lid. The concrete canal 1 is used.

  As shown in FIG. 3A, the surface concrete 9 on each inner surface of the bottom wall 2 and the left and right rising walls 3 that define the water channel is continuously removed to form a surface concrete removal surface area 10.

  Alternatively, the surface concrete 9 on the upper end surface of the left and right rising walls 3 continuous to the surface concrete 9 on each inner surface of the bottom wall 2 and the left and right rising walls 3 is removed, and the inner surfaces of the bottom wall 3 and the left and right rising walls 3 are A continuous concrete removal surface area 10 is formed on the upper end surface of the raised wall 3.

  As a suitable example, the inner surface of the bottom wall 2 and the left and right rising walls 3 or the surface concrete 9 on the upper end surface of the left and right rising walls 3 is removed by applying a water jet to form the surface concrete removing surface area 10. .

  The water jet is known as a method of removing superficial concrete 9 by ejecting ultrahigh pressure water from a nozzle, and can be quickly removed and removed to a uniform depth. In addition to this water jet, sand blasting, steel blasting, sanding, etc. can be applied.

  Next, as shown in FIG. 3B, an epoxy resin is applied and impregnated on the inner surface of the concrete removal surface area 10. That is, primer treatment is performed to form the primer layer 11. This primer treatment is selectively performed according to the situation at the site.

Next, as shown in FIG. 3C, the surface concrete removal surface area 10 is repaired with a reinforcing coating material layer 12. That is, a polymer cement mortar 13 containing reinforcing resin fibers having the following blending ratio is prepared, and the polymer cement mortar 13 containing reinforcing resin fibers is formed on the surface of the primer layer 11 or the concrete removal surface area 10 that does not have the primer layer 11. The reinforcing coating material layer 12 is formed by coating directly on the concrete surface.
<Blend ratio per cubic meter of polymer cement mortar 13 with reinforcing resin fibers>
Cement 300 ~ 600kg
(Portland cement as a representative example)
600-1200kg of sand
Polymer resin 10-120kg
Reinforced resin fiber 10-60kg

  A polymer cement mortar 13 containing reinforcing resin fibers, which is mainly composed of the above-described composition and mixed and mixed at the above-mentioned mixing ratio, is prepared, and this is spray-coated onto the surface concrete removal surface area 10 of the concrete water channel 1 and a roller. The reinforcing coating material layer 12 is formed by coating or the like.

  As the reinforcing resin fiber 14, a vinylon fiber having a fiber length of 5 to 20 mm and a thickness of 10 to 200 μm, or the same polyethylene fiber, or a mixed fiber of the same vinylon fiber and the same polyethylene fiber is effective.

  As a preferable example, in addition to the above-mentioned compounding material of 300 to 600 kg of Portland cement, 600 to 1200 kg of sand, 10 to 120 kg of polymer resin, and 10 to 60 kg of reinforcing resin fiber, 0.1 to 0.4 kg of water reducing agent is added.

As shown in FIG. 5, the reinforcing resin fiber 14 uses a bundling fiber 15 that is weakly bonded with an adhesive and converged into a flat shape. The water reducing agent 16 is added to the bundling fiber 15, and the water reducing agent is added to the bundling fiber 15. 16 is added and a sufficient laying time is set in the contact state, for example, the bundled fiber 15 added with the water reducing agent 16 is accommodated in the container 18 and the bundled fiber 15 is put together with the water reducing agent 16 to the polymer cement. by kneading formulated in mortar to form a reinforcing fiber-containing polymer cement mortar 13.

  The water reducing agent 16 uniformly infiltrates into the bundling fiber 15 by the above-mentioned laying time, weakens the bundling by the adhesive and promotes the dispersion at the time of mortar kneading, and prevents the phenomenon that the fiber 14 becomes a dumpling. That is, the kneading promotes the effect of uniformly mixing the fibers 14 in the mortar.

  When a mixed fiber of polyethylene fiber and vinylon fiber is used as the reinforcing resin fiber 14, it is selected from 2 to 10 kg of polyethylene fiber and 8 to 50 kg of vinylon fiber, and blended so as to be 10 to 60 kg as a whole. As a suitable example, a mixed fiber of 5 kg of polyethylene fiber and 30 kg of vinylon fiber is used.

  As the polymer resin, a styrene butadiene resin system, a polyacrylic ester resin system (acrylic resin system), an ethylene vinyl acetate resin system, a vinyl acetate / veova resin system, or the like is used.

  As sand used in the present invention, silica sand produced from silica, artificial lightweight sand (for example, ceramic sand), river sand, mountain sand, ore, fly ash, or the like, or a mixture thereof is used.

  As shown in FIG. 4A, in the case of a repair structure in which a synthetic resin mesh 17 covering the surface concrete removal surface area 10 is embedded in the reinforcing coating material layer 12 composed of the polymer cement mortar 13 containing the reinforcing resin fibers, Then, an undercoat 13a made of polymer cement mortar 13 containing reinforcing resin fibers is applied.

  Next, as shown in FIG. 4B, in the uncured state of the undercoat 13a of the polymer cement mortar 13 containing the reinforcing resin fibers, the surface (the bulging surface) of the undercoat 13a has a knitted structure made of a polyethylene mesh sheet or an aramid mesh sheet. A synthetic resin mesh 17 is applied under pressure.

  By applying the synthetic resin mesh 17 under pressure, the polymer cement mortar 13 containing the reinforcing resin fibers of the undercoat 13a enters into the mesh of the mesh 17, and at the same time, the reinforcing resin fibers 14 enter the mesh. The forming wire of the mesh 17 and the reinforcing resin fiber 14 are intertwined and joined.

  Next, as shown in FIG. 4C, the surface of the undercoat 13a, that is, the surface of the mesh 17 is overcoated with the polymer cement mortar 13 containing the reinforcing resin fibers to give the top coat 13b, and the mesh 17 is applied to the polymer cement containing the reinforcing resin fibers. It is embedded in the reinforcing coating material layer 12 composed of an undercoat 13a made of mortar 13 and an overcoat 13b.

  The thickness of each of the undercoat 13a and the topcoat 13b is set to about one half of the reinforcing coating material layer 12 having a predetermined thickness.

Next, the strength test results of a square bar specimen (100 × 100 × 400 mm) obtained by kneading and molding the above-mentioned polymer cement mortar 13 containing reinforcing resin fibers at the following blending ratio will be described.
<Blend ratio per cubic meter of polymer cement mortar 13 with reinforcing resin fibers>
Portland cement 450kg
1000kg of sand
Acrylic resin (polymer resin) 14kg
Polyethylene fiber 24kg
(Fiber length around 10mm, thickness 20μ)
Water reducing agent 0.2kg

  The strength test result of the specimen in which the reinforcing coating material layer 12 having a coating thickness of 6 mm was formed without embedding the mesh 17 using the polymer cement mortar 13 containing the reinforcing resin fibers kneaded at the above blending ratio, that is, at both ends of the specimen. As a result of examining the relationship of strain (%) to tensile stress (n / square millimeter) shown in FIG. 6 when tensile stress in the axial direction is applied, as shown in the graph, elongation (strain) of 2 to 6% It was confirmed that the strength was maintained until the occurrence of

  Further, as a result of examining the relationship between the displacement (mm) with respect to the bending load (kN) and the strength when a bending load is applied to the specimen shown in FIG. 7, sufficient bending strength is obtained even with a bending displacement of 1 to 4 mm. Was confirmed to be maintained.

  In addition to the above, when the mesh 17 is embedded, an entanglement effect using the reinforcing resin fibers 14 and the polymer cement mortar 13 of the mesh 17 as a medium can be expected, and a dramatic enhancement effect can be expected.

Sectional drawing which outlines the inner surface repair structure of the conventional concrete waterway. Sectional drawing explaining the peeling state of the coating material layer for reinforcement in the internal surface repair structure of the conventional concrete waterway. A, B, C is sectional drawing which shows the inner surface repair method of the concrete use channel which concerns on this invention in order of a process. A, B, C is sectional drawing which shows the other example of the inner surface repair method of the concrete waterway which concerns on this invention in process order. Sectional drawing which outlines the state which added the water reducing agent to the bundling fiber of the reinforced resin fiber, and laid down. The graph which shows the intensity | strength test result of the distortion | strain (%) with respect to the tensile stress (n / square millimeter) of the test body in the inner surface repair method of the concrete water channel which concerns on this invention. The graph which shows the intensity | strength test result of the displacement (mm) with respect to the bending load (kN) of the test body in the inner surface repair method of the concrete water channel which concerns on this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Concrete channel, 2 ... Bottom wall, 3 ... Left and right rise wall, 9 ... Surface concrete, 10 ... Surface concrete removal surface area, 11 ... Primer layer, 12 ... Reinforcement coating material layer, 13 ... Reinforcement resin fiber Polymer cement mortar containing, 13a ... undercoat, 13b ... topcoat, 14 ... reinforcing resin fiber, 15 ... bundling fiber, 16 ... water reducing agent, 17 ... synthetic resin mesh, 18 ... container.

Claims (3)

Waterways surface layer concrete bottom wall and the inner surface and the left and right rising walls upper surfaces of the left and right rising walls removed continuously defining, per the other one cubic meter,
Cement 300-600kg,
600-1200 kg of sand,
10 to 120 kg of polymer resin,
Reinforced resin fiber 10-60kg,
It was composed primarily, and prepared the reinforcing resin fiber as blended focusing fibers focused onto the weakly adhered flat with an adhesive and formed by kneading reinforcing resin fiber filled polymer cement mortar, the reinforcing resin fiber filled polymer cement A method for repairing the inner surface of a concrete channel, wherein mortar is applied to each inner surface of the bottom wall and left and right rising walls and to the surface concrete removal surface area of the upper end surface of the left and right rising walls to form a reinforcing coating material layer. . 2. The reinforcing resin fiber according to claim 1, wherein a vinylon fiber having a fiber length of 5 to 20 mm and a thickness of 10 to 200 [mu], or the same polyethylene fiber, or a mixed fiber of the same vinylon fiber and the same polyethylene fiber is used. Repair method for the inner surface of concrete canal. A synthetic resin mesh covering the surface concrete removal surface area was embedded in the reinforcing coating material layer composed of the polymer cement mortar containing the reinforcing resin fiber, and an entangled structure of the mesh and the reinforcing resin fiber was formed. The method for repairing the inner surface of a concrete water channel according to claim 1, wherein the concrete water channel is repaired.

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