JP2007297900A - Repairing method for concrete water-passage wall and structure of the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a repairing method for a concrete water-passage wall by which a degraded part appearing on a wall surface of a concrete water-passage structure used for hydraulics-related facilities like an industrial water-passage or an agricultural water-passage is removed and fine cracks or the like formed in the surface after the construction can be restrained by improving the strength, as well as to provide the concrete water-passage wall structure. <P>SOLUTION: The repairing method for the concrete water-passage wall includes a foundation treatment process for removing the weakened part of the wall including an area of the surrounding normal wall part to expose a sound part inside the normal concrete, and a coating process for coating the sound part with a mortar base material including an organic fiber. The repairing method also includes a successive laying process in which an embedding material is embedded in the mortar base material of a successive joint part of a side face and a floor face of the water-passage wall. The concrete water-passage wall structure 10 has an alkali-resistant glass fiber sheet F and mortar base material layers 12, 13 including a chopped fiber which are formed on a structural cross section perpendicular to the direction of flow of the water passage W by means of the repairing method for the concrete water-passage wall. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention is a repair method that is performed to compensate for deterioration of the structure of the surface of a concrete channel structure used over time, such as industrial waterways and agricultural waterways, and the repair method. The present invention relates to a concrete canal wall structure for irrigation canal for water intake or drainage.

  A concrete waterway structure is generally used as a waterway facility used for various purposes. Since such a concrete water channel structure can be used for a long time once it is constructed, the surface part of the water channel is chemically or physically eroded by water flowing along the water channel and foreign substances flowing along with the water over time. Etc. will continue to be affected. In addition, depending on the environment around the construction site of the waterway, the surface of the structure may deteriorate significantly due to the effects of various types of pollution caused by biological activities. It will be necessary to repair, repair and repair damaged parts.

  For example, in the case of agricultural canals, even if the surface of the canal wall is only 5 years old after construction, invasion from the outside wall of the plant that inhabits the canal in addition to water flow and water pressure, that is, plant roots In addition, the mortar removal action is remarkably enhanced by various factors such as the invasion of various organisms such as insects, and the deterioration of the wall surface of the water channel is also observed.

  In addition, although the concrete wall surface of the canal depends on the construction method, defects such as fine cracks and cracks are likely to occur on the concrete wall surface after construction. If the cracked part is left as it is, the service life after construction of the canal wall There is also a problem that the length is made shorter than expected at the time of design.

In order to improve the deterioration state of such concrete waterway walls and make the waterway usable continuously over a long period of time, various methods for repairing the waterway equipment have been invented and used so far. For example, Patent Document 1 discloses a method of filling and repairing a recess with a repair material in which mortar, glass waste, and fly ash are mixed. Patent Document 2 discloses a method of filling an adhesive between a plurality of resin concrete panel members and the surface of a deteriorated water channel. In addition, when aging and deterioration become too large and the function as a irrigation channel cannot be performed sufficiently, the entire irrigation channel is once destroyed and a new irrigation channel is constructed. Further, Patent Document 3 discloses an invention in which cracks generated on the surface of the hardened concrete body are suppressed by using a shrinkage reducing agent.
JP 2001-213653 A JP 2005-120664 A JP 2004-175633 A

  However, the construction methods disclosed so far are not sufficient. Although the method like the above-mentioned patent document 1 has a certain effect, the joint part between the filling and replenishing part and the old part may cause further deterioration. Moreover, when employ | adopting the construction method disclosed by patent document 2, there also exists a problem that the cross-sectional area of an irrigation channel must be made smaller than before repair. In addition, in order to destroy the entire irrigation channel once, not only high repair costs are required, but also the time required for construction becomes long.

  In addition, the use of a drug such as Patent Document 3 is effective in suppressing cracking, but it is used in the atmosphere such as the side wall surface of a water channel or the surface of a floor surface. In order to suppress cracks and cracks that occur in harsher environments, it is necessary to achieve greater deterrence.

  In view of such circumstances, the present invention improves deterioration over time that occurs on the wall surface of concrete channel structures used as hydraulic equipment such as industrial waterways and agricultural waterways, and realizes higher strength than before. At the same time, it is a problem to provide a method for repairing a concrete channel wall that can effectively suppress fine cracks and cracks generated on the surface of the cured body after construction, and a channel wall structure obtained by this method. And

  The concrete water channel wall repair method of the present invention is a repair method for repairing a concrete water channel wall where a weakened or aged part has occurred, and is normal to the weakened part or the non-aged part and its surroundings. A surface treatment step for removing a range extending to a wall portion and exposing a healthy portion inside normal concrete, and a coating step for applying a mortar base material containing organic fibers to the healthy portion. And

  Here, it is a repair method for repairing a concrete channel wall in which a weakened part or an aging part has occurred, and removes the range covering the weakened part or the aging part and the normal wall part around it, Having a ground treatment process for exposing a healthy part inside normal concrete and a coating process for applying a mortar base material containing organic fibers to the healthy part is a physical weakening or chemical over time. Over time due to the inner wall, outer wall, floor surface in contact with water, etc., and the bottom surface of the channel structure, and the inside of the structure. It is intended for all the concrete material parts that make up waterways, such as defects caused by environmental factors of construction, human defects, defects generated in the design, and problems that compound them. The generated sites such problem is repaired method of improving to the initial intensity state or initial strength higher than state. By removing the surface from the weakened or weakened surface, the surface of the weakened or weakened state and a part of the surrounding normal part are also removed, and the normal surface is exposed. A structure having an appearance quality and strength higher than that of a concrete water channel wall surface by two processes, a ground treatment process to be in a finished state and a coating process for applying a mortar base material containing organic fibers on the exposed surface It means that it is a construction method comprising a coating process for forming an object. Here, a healthy part, that is, a normal part is a part where no significant chemical or physical deterioration is recognized over time with respect to the function required for the water channel, and the color has simply changed in appearance. It doesn't mean that. The deteriorated portion represents a portion where a decrease in performance is recognized such that the strength, hardness, chemical durability, etc. necessary for the water channel cannot be maintained.

  Here, the wall does not simply mean the side wall surface inside the water channel, but includes the outer surface of the side wall, the bottom surface corresponding to the outer surface of the structure, the floor surface always in contact with a fluid such as water, etc. In addition, it is not necessarily the surface, and the case where the surface of the structure has to be regenerated due to a problem caused by the inside of the concrete structure also falls under this case.

  By removing the surface from the weakened or weakened surface, the surface area of the weakened or weakened state and the area extending to the surrounding normal wall are removed, and the normal surface inside the concrete is exposed. For example, the ground treatment process to be performed is performed in the following procedure.

  First, the sediment or sludge accumulated in the channel to which the repair method is applied is removed. At that time, aquatic plants are also removed. Any removal method may be used, but if the volume of the waterway concrete is sufficiently large, it is efficient to use a small shovel car or the like. If the volume of the canal concrete is not large enough, it will be done manually using tools such as excavators and scoops. After the removal work of earth and sand in the waterway is completed, use 10 ~ 20MPa of high pressure water to remove the surface of the concrete waterway that has become fragile due to aging and algae that could not be removed sufficiently by the removal work. I do. When using high-pressure water, if the water pressure is too high, the sound concrete part will be excessively removed.On the other hand, if the water pressure is too low, sufficient removal cannot be achieved. In addition, it is preferable to perform the removal with care so that the water pressure is such that the healthy part is slightly removed. When the removal of the aging part is completed, the degree of damage to the waterway concrete will be investigated. In this investigation, attention should be paid to the size, location, and depth of large cracks, rebar exposure, and large defects. In addition, rust prevention treatment is applied to the exposed reinforcing bars, and mortar is backfilled for large defects to make the surface almost flat.

  Moreover, the coating process which forms the structure which has the appearance quality and intensity | strength more than before according to two steps of the coating process of apply | coating the mortar base material containing an organic fiber on the healthy exposed surface. Is specifically as follows.

  First, a mortar base material is prepared in advance so as to be a compounded material in which organic fibers, water, sand, cement, and glass fibers in a chopped form are mixed in an equal manner. The fibers may be fed into the kneader while cutting continuous fibers. As additives to be added to the mortar, additives other than the above can be optionally added as necessary.

  Examples of such additives include a water reducing agent that can reduce the amount of water used without impairing workability even when mixed in concrete, to reduce the effects of mortar and concrete temperature and outside air temperature, Curing accelerators and retarders used to adjust the setting speed depending on the time until setting after mixing, the effect of reducing heat of hydration, long-term strength, erosion resistance or heat resistance, and water tightness Slag, fly ash, and silicon-containing admixtures such as silica fume, which are also used to give various functions such as improving fluidity and reducing shrinkage, and infinite number of fine bubbles mixed in the concrete. AE agent (Air), a concrete admixture used to improve workability when placing concrete into concrete, durability of hardened concrete, and frost damage resistance nraining Agent (also called air entraining agent), rust preventive used for corrosion control of oxidative aggregates such as reinforcing bars caused by salt contained in concrete (mainly chloride component), and in mortar and concrete Adds a large amount of air bubbles to the product to add foaming agents used for weight reduction, heat insulation, etc., other fluidizing agents, thickeners, waterproofing agents, coloring agents, quick setting agents, etc. May be. In addition, an antibacterial agent for suppressing the generation of algae and moss, a nutrient for promoting the generation, a growth promoter, and the like may be added to the surface of the repair mortar as required.

  Here, the material of the chopped organic fiber according to the present invention is familiar to concrete and is not significantly chemically altered by the concrete, and is mixed into the concrete, thereby mixing the surface of the cured body after construction. There is no particular limitation as long as it is made of a material having sufficient strength to suppress the generation of fine cracks.

  For example, the material of the chopped organic fiber includes aramid, polyvinyl alcohol, polypropylene, polyethylene terephthalate, polyethylene, nylon, polyester, polyethylene, ethylene vinyl acetate copolymer, polypropylene, polystyrene, AS resin, ABS resin, methacrylic resin. , Polyvinyl chloride, polyamide, polycarbonate, polyethylene terephthalate, polybutylene terephthalate, cellulose acetate, diallyl phthalate, urea resin, melamine resin, xylene resin, phenol resin, unsaturated polyester, epoxy resin, furan resin, polybutadiene, polyurethane, polyvinyl butyral , Polyvinyl formal, polyvinyl alcohol, melamine phenol resin, vinyl acetate resin, ionomer , Chlorinated polyether, ethylene-α olefin copolymer, ethylene vinyl chloride copolymer, chlorinated polyethylene, vinyl chloride vinyl acetate copolymer, vinylidene chloride, acryl vinyl chloride copolymer resin, AAS resin, ACS resin, polyacetal , Polymethylpentene, polyphenylene oxide, norca resin, polyphenylene sulfide, butadiene styrene resin, polyurethane, polyamino bismaleide, polysulfone, polybutylene, silicon resin, polytetrafluoroethylene, polyfluoroethylenepropylene, perfluoroalkoxy fluoroplastic, Polyvinylidene fluoride, MBS resin, methacryl-styrene copolymer, polyimide, polyarylate, polyallyl sulfone, polybutadiene, polyether sulfone, polyether ether Luketone can be used. Further, a composite material in which an appropriate amount of glass fiber, carbon fiber, natural fiber, glass powder, glass bead, ceramic fiber, ceramic powder or the like is mixed in these materials may be used.

  The mortar according to the present invention is a so-called cement mortar, and cement mortar or polymer cement mortar containing appropriate amounts of cement, fine aggregate, lightweight aggregate, water, and polymer, which are generally used as materials for construction civil engineering, are used. it can. Various admixtures can be appropriately added and mixed. Unless otherwise specified, the mortar referred to in the present invention refers to a cement mortar and a polymer cement mortar.

  There is no special need for water. However, it is not preferable to use a water-soluble component to which a component that functions to prevent hardening due to a hydration reaction of cement is added. For example, water specified in JIS A 5308 (2003) ready-mixed concrete Can be used.

  Moreover, about the mortar base material which concerns on this invention, the kind of sand and aggregate used when comprising a mortar base material is not ask | required. That is, for example, crushed sand or sand specified in Appendix 1 of JIS A 5308 (2003) can be used. It is preferable to use sand having a fine maximum particle size because the surface finish is good. Moreover, since the one where there are few fine powders of 0.15 mm or less improves the abrasion resistance of mortar, it is good.

  When there is a portion where the reinforcing bar is exposed at the weak portion by performing high-pressure cleaning, a rust preventive paint such as lithium nitrite is applied to the surface and backfilled with mortar. In addition, necessary chemicals such as a water absorption adjusting agent can be applied on the surface to be constructed. It is preferable to use the same type of water absorption adjusting agent as the polymer added to the mortar because the compatibility is good and sufficient adhesive strength is obtained.

  After such a series of preparations, the mortar is kneaded using a so-called plaster mixer, a so-called mortar mixer or a mixer having a kneading performance equal to or higher than that. Although there is no particular limitation in the order of input, there is no unevenness of materials if powders such as fine aggregate, cement and admixture are added and kneaded and then liquid such as water and polymer are added and kneaded. Since mortar is obtained, it is preferable. Further, since any step after the step of empty-kneading the powder may be performed, continuous fibers can be cut into a predetermined length and added while kneading. The undercoat layer is formed so that the mortar base material blended at the end of the kneading process is evenly applied to the leaked sound work surface that has been subjected to the ground treatment step so as to obtain a flat surface state. When forming the undercoat layer, if it is applied with sufficient pressure with a trowel so that air is not caught in the newly applied healthy part and does not remain in the structure, defects such as blistering of the mortar layer will occur after construction. Since it becomes difficult to generate | occur | produce, it is preferable. Although the thickness of the undercoat layer varies depending on the state of deterioration, an amount corresponding to about half the thickness of the entire repair layer is applied. The thickness of the entire repair layer is at least a thickness that can secure the cover thickness of the reinforcing bar at the initial stage of the irrigation canal, but is 10 mm or more when the thickness is already sufficiently secured by the concrete in the sound part. And the operation | work which presses down the sheet | seat which consists of a fiber with an elasticity modulus of 20 GPa or more to the surface of an undercoat layer is performed. It is preferable to lie down so that the sheet is not lifted because the workability of top coating is improved and a good repair layer can be formed.

As for the sheet made of fibers having an elastic modulus of 20 GPa or more, any material may be used as long as it has a predetermined performance with respect to other performance such as chemical durability and hardness. A sheet made of organic resin such as polystyrene or the like, a sheet woven from carbon fiber, a sheet made of ceramic fiber, or the like can be appropriately employed depending on the construction location. However, considering various viewpoints such as cost, ease of construction, and durability, and comparing them comprehensively, a sheet made of glass fiber is preferable, and a sheet using glass fiber containing ZrO ₂ is preferable. More preferably it is.

  Furthermore, if the sheet made of fibers having an elastic modulus of 20 GPa or more is used, for example, a sheet constituted by using the alkali-resistant glass fiber described above, the sheet shape may be a net or mesh. However, other forms such as a rolled cloth or a mat may be used. The net or mesh sheet may be a woven fiber or a non-woven form. In the case of a woven form, for example, a woven form such as an entangled weave or a plain weave can be adopted. As long as it is a non-woven form, it may be a braided cloth. A plurality of organic resins can be applied to the fiber sheet as necessary, and the hardness and handling properties of the sheet can be adjusted to an appropriate state.

  In addition, when the sheet made of fibers having an elastic modulus of 20 GPa or more is in the form of a net or mesh, the opening of the net or mesh is appropriate depending on the size of the aggregate used in combination with concrete or mortar. An open mesh can be used. Further, the net or mesh is not particularly limited as long as it satisfies a predetermined performance with respect to forms such as the thickness and number of fibers constituting the net or mesh.

  After the sag of the sheet made of fibers having an elastic modulus of 20 GPa or more is completed, in order to form a further overcoat layer from above, the mortar concrete fabric previously kneaded and blended is applied in the same procedure as in the formation of the undercoat layer, It is leveled so that the total thickness of the repair layer described above is obtained, so that a flat and smooth surface is obtained. A smooth surface is preferable because the roughness coefficient is improved. Furthermore, if necessary, the surface of the topcoat layer is painted or caulked with joints to complete the concrete channel wall.

  In addition to the above, the method for repairing a concrete channel wall according to the present invention is a surface generated in the curing stage after mortar is applied if the organic fibers are in the form of chops having an average length of 1 mm or more and 50 mm or less. This is preferable because the occurrence rate of cracks can be reliably reduced.

  Here, the organic fiber is in the form of a chop having an average length dimension of 1 mm or more and 50 mm or less. The form of the organic material mixed in the mortar base material is a filament shape, and the average length is 1 mm. This means that the dimension is 0.05 m or less.

  The diameter of the organic fiber is preferably limited by a value determined by the aspect ratio. The ratio of the diameter of the organic fiber to the length of the fiber, that is, the so-called aspect ratio expressed as a value obtained by dividing the length of the fiber by the diameter of the organic fiber needs to be set to a sufficiently large value. The aspect ratio needs to be at least 50, and the larger the value, the greater the effect of adding organic fibers. On the other hand, when the aspect ratio increases, the workability when kneading organic fibers into mortar decreases. Therefore, up to 2000 is preferable. Therefore, it is preferable to determine the diameter corresponding to the length of the organic fiber so that the value of the aspect ratio of the organic fiber having the chopped form is 50 to 2000.

  The chopped organic fiber may be obtained by any molding method. That is, for example, it may be molded by cutting, molded by a method such as blow-off molding or gas phase synthesis, or by other methods.

  If the average length of the chopped organic fibers exceeds 50 mm, the fibers tend to get tangled during the mixing operation, requiring labor for the mixing operation to homogenize the mortar, and the inhomogeneous construction state even after construction Therefore, it is not preferable because a construction surface capable of completely suppressing cracks and the like and a construction surface where such an effect is not recognized may appear. From this point of view, the long dimension of the chopped organic fiber is more preferably 25 mm or less, and further preferably 13 mm or less. On the other hand, if the average length of the organic fibers is less than 1 mm, the effect of suppressing cracks by adding the chopped organic fibers cannot be obtained. And from a viewpoint of making the addition effect of said organic fiber express clearly, More preferably, organic fiber shall be 3 mm or more, More preferably, it is 6 mm or more.

  The concrete water channel wall repair method of the present invention is a repair method for repairing a concrete water channel wall in which a weakened part or an aging part has occurred, and includes a chopped fiber in the repair part of the water channel wall. It has the layered construction process which coats one mortar base material, attaches an embedding material, and coats the 2nd mortar base material from it.

  Here, it is a repair method for repairing a concrete channel wall in which a weakened part or an aging part has occurred, and a first mortar base material containing chopped fibers is applied to the repaired part of the channel wall. A structural problem due to various causes such as physical and chemical weakening over time as described above, having a layered construction process in which a buried material is attached and a second mortar base material is applied thereon. In a repairing method for repairing a predetermined surface structure part of a waterway facility made of concrete having a defect, and improving the problem part to an initial strength state or an initial strength state or more, a chopped shape After embedding the first mortar base material containing a fiber material that exhibits the appearance of embedment, embeded materials with various performances, such as mortar reinforcement effect, crack prevention effect, expansion coefficient adjustment effect, etc. By applying a second mortar substrate further thereon, which means that the construction such that a layer with leveling mortar substrate.

  About the burying material which implement | achieves various performances, the form may be what kind and there is no restriction | limiting also in the number and quantity to embed. This burying material is solid, has a size that can be seen with the naked eye, and is not a chopped fiber. Therefore, this burying material can be various forms such as a string shape, a tape shape, a sheet shape, a lump shape, and a pellet shape as necessary, and can intentionally impart desired performance. . Therefore, as described above, the buried material can be formed into a sheet shape.

  In addition, as a method of leveling the mortar base material in the present invention, it is possible to use a desired tool regardless of whether it is performed manually or by using a predetermined tool, device, machine, or the like. What is necessary is just to be able to set it as an aspect.

  In addition to the above, the method for repairing a concrete canal wall according to the present invention has a side surface by embedding a burying material in each mortar base material of the side surface and the floor surface at the joint portion between the side surface of the water channel wall and the floor surface. As long as it has a continuous process that connects the floor and the floor surface, the side surface and the floor surface can be firmly bonded, and even if it is susceptible to external forces, etc., it has high durability It can be.

  What has a connecting step of connecting the side surface and the floor surface continuously by embedding a burying material in the mortar base material of each of the side surface and the floor surface at the joint portion between the side surface of the water channel wall and the floor surface It is as follows. That is, when improving the specific part of the channel wall where the problem has occurred as described above to the initial strength state or the initial strength state or more, the side of the channel and the wall portion of the floor surface during the coating of the channel wall In the part located in the vicinity of or near the contact side, the process is performed by jointing by joining the channel floor surface and the side surface with the embedded material embedded in the mortar base material.

  The buried material is most preferably a sheet made of the above-described fiber having an elastic modulus of 20 GPa or more, but it is embedded in the mortar base material even in various other forms of buried materials as described above. Use of such a material is not prevented as long as it has a performance of firmly joining the channel floor surface and the side surface.

  That is, in the concrete water channel wall repairing method of the present invention, if the burying material is made of fiber having an elastic modulus of 20 GPa or more in addition to the above, it is possible to make the continuous place a stronger structure.

  In addition to the above, the method for repairing a concrete canal wall according to the present invention has a sufficiently high strength because the embedded material is made of glass fiber or carbon fiber, because it is very elastic. Therefore, the strength and crack resistance of the water channel wall after repair are higher than before.

  That the burying material is made of glass fiber or carbon fiber means that the main component of the burying material contains either glass fiber or carbon fiber. The glass fiber may be of any material, shape, and shape, but is most preferably alkali-resistant glass as described above. Also, the size and form of carbon fiber are not questioned.

  In addition to the above, the method for repairing a concrete channel wall according to the present invention is formed by a coating process if it has a covering step of covering a plate-like material over substantially the entire coated surface coated with a mortar base material. This is preferable because the cured surface is further protected.

  Here, having a covering step of covering the plate-like material over substantially the entire surface of the coating surface coated with the mortar substrate means that sufficient strength is provided for the substantially entire surface of the coating surface obtained by the procedure described above. It is to be protected by covering with a plate-like material having a solid. In particular, at locations where there is a drop in the channel floor, such as at the gathering point of the irrigation channel, water flowing in the channel flows down from the upper channel floor to the lower channel floor due to the drop in the channel floor. In this case, if it is constructed on the floor corresponding to the location where water hits directly and the location related thereto, the effect of protecting the construction surface is great.

  As for the plate-like material used here, any material can be used as long as it has a strength capable of protecting the coated surface. In other words, natural stone materials and artificial stone materials can be used. For example, for artificial stone materials, concrete plates, glass plates, ceramic plates, glass ceramic plates, FRP plates, GRC boards, carbon fiber reinforced boards, etc. should be adopted as appropriate. Is possible. In addition, for example, various natural stone materials can be used, from high-grade stone materials such as granite and marble to those that can be obtained at low cost, such as those obtained by cutting and processing sedimentary rock.

  Further, the outer shape of the plate-like material is not limited. In other words, it may be rectangular, may have a polygonal appearance such as a triangle, pentagon or hexagon, or may have a circular or elliptical shape, or another irregular shape. Further, the plate-like material can be decorated with an appropriate coloring or pattern, surface irregularities, etc. on its surface. Moreover, about a plate-shaped object, a certain unevenness | corrugation and a pattern can also be given to an end surface other than the surface with a large area, and its back surface.

  Further, the plate-like material may contain an appropriate amount of an antibacterial agent or the like that suppresses a large amount of undesirable microorganisms such as algae and plankton as necessary. For example, it is also possible to mix and add an appropriate amount of a drug or the like that can continuously exert a desired effect such as sterilization by gradually eluting components having antibacterial effects such as silver (Ag) ions. Contrary to this, the growth of such species is preferable for purifying water and adjusting components contained in water, and if necessary, a sustained-release drug that can promote eutrophication. Can also be used. Furthermore, this kind of chemical | medical agent can also be apply | coated or coat | covered on the surface. Moreover, you may make these chemical | medical agents contain in a base material mortar, apply | coat or coat | cover.

  As a method of covering the board material, it may be bonded by using one or more appropriate resin agents, or it can be fixed by using a fixing tool such as an appropriate pile or anchor. It is also possible to combine and fix each other by providing an uneven portion at the end of the plate-like material. Of course, the plate-like material can be pressed and fixed in an uncured state of the overcoat mortar, and the above-mentioned methods can be used in appropriate combination.

  Moreover, in addition to the above, the mortar base material contains cement, sand, alkali glass fiber, and water, and the mass ratio of sand to cement is 1 to 3. If it exists in a range, since it has high intensity | strength and rigidity, it can be set as the structure durable for a long time.

  Here, the mortar base material contains cement, sand, alkali-resistant glass fiber, and water, and the mass ratio of sand to cement is in the range of 1 to 3 as described above. This means that a glass material having high resistance to alkali in addition to water can be used. Furthermore, when the cement is set to 1, the mass ratio of sand to that of 1 to 3 is preferable because drying shrinkage can be further reduced and the occurrence rate of cracks generated on the surface of the construction part during drying can be reduced. When the value is lower than 1, the effect of suppressing drying shrinkage is reduced, and when the value exceeds 3, a sufficiently high value cannot be realized in some cases.

The composition of the glass fibers can exhibit alkali-resistant performance, for example, as represented by mass _{percentage, SiO 2 54~65%, ZrO 2} 14~25%, Li 2 O 0~5%, Na 2 O 10~17%, K ₂ O 0-8%, RO (where R represents the total amount of Mg, Ca, Sr, Ba, Zn) 0-10%, TiO ₂ 0-7%, Al ₂ O ₃ 0-2% And more preferably, by mass%, SiO ₂ 57-64%, ZrO ₂ 18-24%, Li ₂ O 0.5-3%, Na ₂ O 11-15%, K ₂ O 1 -5%, R'O (where R 'represents the total amount of Mg, Ca, Sr, Ba, Zn) 0.2-8%, TiO ₂ 0.5-5%, Al ₂ O ₃ 0 ~ 1%.

  In addition to the above, the method for repairing a concrete canal wall according to the present invention is suitable for the durability of the canal wall if the mortar base material contains any of vinyl acetate-ethylene copolymer, acrylic resin, or SBR resin. It is preferable because the properties and strength, the adhesive strength between the concrete base and the mortar base material, and the curing property can be optimized.

  Here, when the mortar base material contains any of vinyl acetate-ethylene copolymer, acrylic resin, or SBR resin, is the mortar base material a product of a copolymerization reaction between vinyl acetate and ethylene? Or acrylic acid, methacrylic acid and derivatives thereof, or a radical copolymer of styrene and butadiene.

  As an addition form of vinyl acetate-ethylene copolymer, acrylic resin, or SBR resin, it can be added as a liquid such as an emulsion, or it can be added as a powder form, or both are used in combination. It is also possible. Any organic agent can be appropriately increased or decreased within a range of 0 to 50% by mass in terms of solid content with respect to cement.

  Moreover, the mortar base material of this invention does not prevent adding an organic agent other than said organic additive in an appropriate amount.

  In addition to the above, the method for repairing a concrete canal wall according to the present invention is that after performing the construction of the canal side wall, if the construction of the canal floor is subsequently performed, the age after construction at the construction of the canal side wall It is preferable because the soft channel floor surface of the young surface portion can be protected and the final appearance can be maintained.

  The concrete waterway wall structure of the present invention contains a sheet made of fibers having an elastic modulus of 20 GPa or more and chopped fibers in a cross section perpendicular to the flow direction of the waterway of the waterway wall by the above-described concrete waterway wall repair method. It is constructed so as to form a layered structure with the mortar base material.

  Here, by the above-described repair method of the concrete channel wall, a layer made of a sheet made of fibers having an elastic modulus of 20 GPa or more and a mortar base material containing chopped fibers in a cross section perpendicular to the channel flow direction of the channel wall. As described above, it is constructed so as to form a structure. A mortar base material containing chopped fibers in the order of an undercoat layer and an overcoat layer is constructed on the wall surface of the water channel, and an elastic modulus is provided between the two layers. Is a layered structure of a sheet made of fibers having an elastic modulus of 20 GPa or more and a mortar base material containing chopped fibers in a structural cross section perpendicular to the flow direction of the water channel by sandwiching a sheet made of fibers of 20 GPa or more Is a structure constructed to form

  If the elastic modulus is a value smaller than 20 GPa, the fiber applied together with concrete or the like is not preferable because the effect of suppressing defects such as cracks and cracks generated after the application of concrete or the like may be poor. From such a viewpoint, the elastic modulus of the fiber sheet used in the concrete channel wall structure of the present invention is more preferably 25 GPa or more, more preferably 30 GPa or more, still more preferably 35 GPa or more, and still more preferably. It is 40 GPa or more, and most preferably 50 GPa or more.

Examples of the material of the fiber having an elastic modulus of 20 GPa or more according to the present invention include alkali-resistant glass fiber, carbon fiber, polyvinyl alcohol fiber, polyethylene fiber, and aramid fiber. Examples of the alkali-resistant glass fiber include, by mass percentage, SiO ₂ 54 to 65%, ZrO ₂ 14 to 25%, Li ₂ O 0 to 5%, Na ₂ O 10 to 17%, K ₂ O 0 to 8%. , RO (wherein, R is, Mg, Ca, Sr, Ba, the total amount of the representative of _{Zn) 0~10%, TiO 2 0~7} %, Al 2 O 3 0~2% is a preferred, more preferably, in _{mass%, SiO 2 57~64%, ZrO} 2 18~24%, Li 2 O 0.5~3%, Na 2 O 11~15%, K 2 O 1~5%, R'O (However, R ′ represents the total amount of Mg, Ca, Sr, Ba, and Zn) 0.2 to 8%, TiO ₂ 0.5 to 5%, and Al ₂ O ₃ 0 to 1% are preferable.

  As a method for confirming that the fiber has a modulus of elasticity of 20 GPa or more, any known method and accurate reproducibility may be used. For example, if the fiber is an alkali-resistant glass fiber, JIS R3420 (1999). The elastic modulus may be calculated from the tensile strength and elongation measured by the method described in 1. If carbon fiber, the method described in JIS R7606 (2000), and if other fiber, the method described in JIS R3420. You may apply mutatis mutandis.

  In addition, for chopped fibers in the mortar substrate, fibers of different forms and materials may be used in the undercoat layer and the overcoat layer, or fibers may be added only to the overcoat layer for which cracking is to be suppressed. Good.

  The concrete canal wall structure of the present invention is fragile as long as a buried material connecting the side surface of the canal wall and the floor surface is buried by the above-described repair method for the concrete canal wall. The joint portion between the side surface and the floor surface that is easily formed can be in a reinforced state.

  Here, by means of a concrete water channel wall repairing method, a buried material connecting the side surface of the water channel wall and the floor surface is embedded. It means that there is a portion where the embedded material is embedded in the mortar base so that the side surface of the water channel and the floor surface are integrated by repairing the wall.

  As for the specific mode of the buried material that integrates the side surface and the floor surface of the water channel, it is sufficient if the crack resistance is improved, for example, the buried material used for the side wall of the water channel. Glass fiber sheet material and a sheet, which is an embedding material used on the floor, are stacked on top of each other to form a layered structure, and jigs such as pins and scissors that join the sheet materials together It is possible to connect two sheets by embedding.

  For example, in the case where a glass fiber sheet material, which is an embedded material used for a side wall of a water channel, and a sheet, which is an embedded material used for a floor surface, are stacked on each other to form a layered structure, the size of the sheet material Although it depends on the size of the sheath and the water channel, it is necessary to perform superimposition having a superimposing dimension of 1 cm or more in the vertical direction along the sheet from at least the edge, and it is more preferable that the superimposing dimension is 3 cm or more. More preferably, it is 5 cm or more.

  In addition to the above, the concrete water channel wall structure of the present invention extends from the side surface side of the water channel wall to the floor surface and is embedded in the floor surface and the first embedded material connecting the side surface and the floor surface. The construction of the concrete canal wall structure can be performed quickly and accurately if the laminated part is formed by laminating the two buried materials, so the labor required to construct the concrete canal wall structure can be reduced. It can be minimized and fully satisfies the required performance.

  In addition to the above, the concrete water channel wall structure of the present invention is excellent in the burying work and handling of the buried material if the buried material is a sheet-like material.

  As described above, various materials and forms are allowed for the sheet-like material. Moreover, the concrete water channel structure of the present invention can be arbitrarily connected to other structures.

  (1) As described above, the concrete water channel wall repair method of the present invention is a repair method for repairing a concrete water channel wall in which a weakened portion or a non-aged portion is generated, and the weakened portion or A ground treatment process that removes the non-aged area and the surrounding normal wall area, exposes the inside of normal concrete to be a healthy part, and a mortar base material containing organic fibers in the healthy part Since it has a coating process to be applied, it is possible to suppress the deterioration over time that occurs on the wall surface, to achieve higher strength than before, and to the finer surface that occurs on the cured body surface after construction. It is also possible to effectively suppress cracks.

  (2) In the concrete water channel wall repair method of the present invention, if the organic fibers are in the form of chops having an average length of 1 mm or more and 50 mm or less, the mortar is in a non-uniform state when adjusting the mortar base material. Therefore, a mortar base material having stable performance can be obtained.

  (3) The method for repairing a concrete channel wall according to the present invention is a repair method for repairing a concrete channel wall in which a weakened part or an aging part has occurred, and a chopped fiber is attached to the repaired part of the channel wall. Because it has a layered construction process that coats the first mortar base material containing, lays the embedding material, and coats the second mortar base material from above, it is made of concrete with high durability It becomes possible to construct a channel wall efficiently.

  (4) Further, the concrete water channel wall repair method of the present invention is a method of embedding an embedding material in the mortar base material of each of the side surface and the floor surface at the joint portion between the side surface of the water channel wall and the floor surface. Since it has a continuous installation process that connects the floor and the floor surface, it is possible to make the connection portion of the side surface of the water channel wall and the floor surface highly vulnerable to weakening or the vicinity thereof in a strengthened state. It is possible to achieve stable quality over a wide range.

  (5) Further, according to the concrete channel wall repair method of the present invention, if the buried material is made of fibers having an elastic modulus of 20 GPa or more, durability against external force is selected by selecting a material having a high elastic modulus. In addition, it is possible to select a material that is easily compatible with the material used for the concrete channel wall.

  (6) Moreover, if the concrete water channel wall repairing method of the present invention has a covering step of covering a plate-like material over substantially the entire coated surface coated with a mortar base material, Not only has the strength and rigidity, but also the appearance of the waterway can have an aesthetic landscape.

  (7) Moreover, the repair method of the concrete channel wall of this invention is a mortar base material containing cement, sand, an alkali-resistant glass fiber, and water, and the mass ratio of the sand with respect to cement is 1-3. If it is within the range, it is possible to respond according to the deterioration state of the work piece by appropriately changing the components and blending ratio, and to reliably suppress cracks generated on the surface of the cured body after construction. Can do.

  (8) The concrete water channel wall repairing method according to the present invention can provide high strength durability and chemical properties if the mortar base material contains any of vinyl acetate-ethylene copolymer, acrylic resin, or SBR resin. It is possible to form a water channel wall having high durability and to obtain a sufficient adhesive strength with the ground concrete, and to make a cost-effective structure. .

  (9) The concrete water channel wall structure of the present invention is a sheet made of fibers having an elastic modulus of 20 GPa or more in a cross section perpendicular to the flow direction of the water channel wall by any one of the above-described concrete water channel wall repair methods. And a mortar base material containing chopped fibers so as to form a layered structure. In addition to various performance improvements, the construction is easy to construct, and the time required for construction It is a highly economical structure that can be shortened.

  (10) If the concrete water channel wall structure of the present invention is formed by embedding a buried material connecting the side surface of the water channel wall and the floor surface by the above-described concrete water channel wall repair method, Since the water channel has the above stable structure, the service life of the water channel can be extended.

  (11) The concrete water channel wall structure of the present invention is a first embedded material that extends from the side surface side of the water channel wall to the floor surface and continuously connects the side surface and the floor surface, and is embedded in the floor surface. If a layered part is formed, the concrete channel wall structure can be constructed quickly and accurately, and the overhead required to construct the concrete channel wall structure can be reduced. It becomes possible to do.

  (12) Since the concrete canal wall structure according to the present invention is excellent in burying work and handling of the buried material if the buried material is a sheet-like material, it is easy to shorten the time required for the work.

  The concrete water channel wall repair method of the present invention and the concrete water channel wall structure by the method will be specifically described below based on examples.

  FIG. 1 shows a cross-sectional view of the main part of the concrete water channel wall structure of the present invention. In the figure, 10 is a channel wall structure, 11 is a healthy part of concrete, 12 is a layer of undercoat mortar, 13 is a layer of topcoat mortar, F is a sheet made of fibers with an elastic modulus of 20 GPa or more, T is a reinforcing bar, B is Rust prevention layer, S represents soil, and W represents a water channel. Reference numeral 14 denotes a mortar stuffed into the defect around the reinforcing bar, and K denotes a water absorption adjusting agent. The concrete water channel wall structure 10 of the present embodiment is a case where there is a portion where a reinforcing bar is exposed where it was a weak portion by high-pressure cleaning, and as shown in FIG. 11 comprises a layer 12 of an undercoat mortar in which a reinforcing bar Ta made of a mortar base material containing chopped fibers is arranged in a cross section perpendicular to the flow direction of the water channel W on the inner wall surface, and fibers having an elastic modulus of 20 GPa or more. It is constructed so as to form a layered structure having the sheet F and a layer 13 of topcoat mortar made of a mortar base material containing chopped fibers.

  FIG. 2 shows a cross section of the main part at the time when the irrigation channel to be repaired was constructed. This waterway is for agricultural waterways, especially for water supply used for irrigation such as rice cultivation. FIG. 3 shows a situation in which a deteriorated portion 15 is generated on the surface of the concrete water channel wall due to secular change. In this agricultural channel, the following procedure was used to improve the deterioration of the concrete channel.

  First, the sediment, sludge, aquatic plants, etc. accumulated in the water channel to which the repair method was applied were removed. After the removal work of earth and sand in the waterway is completed, along with algae and moss that could not be removed by the high pressure water of about 10-20 MPa, removal of the surface of the concrete waterway that became aging, weakened and deteriorated The state as shown in FIG. 4 was obtained. At this time, the concrete was removed so that the deteriorated part was reliably removed to such an extent that the healthy part 11 was slightly removed. About FIG. 4, what was represented by the wavy line is the original size of the deteriorated portion 15 due to aging, and the removal shows that the volume is larger than that. When the removal of the deteriorated part 15 due to aging was completed, the degree of damage to the waterway concrete was investigated, and the position and size of large cracks, exposure of reinforcing bars, large defects, etc. were specified. For exposed steel bars T, use Nippon Steel Chemical's “NS Maintenance Paste” (trade name) for rust prevention treatment B, and for large defects, Nippon Kasei Co., Ltd. ) Made of resinous water-based adhesive “NS-Highflex HF-1000” (trade name) as a primer treatment and then backfilled with mortar 14 to obtain a substantially flat surface as shown in FIG. -High flex HF-1000 was applied to complete the substrate treatment. The part where the reinforcing bars are not exposed in the large defect part was subjected to the same ground treatment as described above except that the rust prevention treatment was not performed.

  After finishing the ground treatment, as shown in FIG. 6, first, an appropriate tool such as a scissors is used to apply an undercoat mortar 12 prepared in advance to the healthy portions 11 on the exposed surfaces of both side walls of the channel wall structure 10. And evenly applied. As the adjustment of the undercoat mortar 12, in terms of parts by mass, cement 100 parts, sand 200 parts, glass fibers 0.7 parts, vinyl acetate-ethylene copolymer emulsion 10 parts, chopped organic resin fibers 0.7 parts, water This is adjusted to 45 parts. Here, for glass fibers, an ARG chopped strand of “Super Crack Non-Pack” (trade name) made of alkali-resistant glass fiber manufactured by Nippon Electric Glass Co., Ltd., and a vinyl acetate-ethylene copolymer emulsion, “NS-Highflex HF-1000” (trade name) manufactured by Nippon Kasei Co., Ltd. was used. As the chopped organic resin fibers, polypropylene chopped strands having a long dimension of 6 mm and a diameter dimension of 0.03 mm and an aspect ratio of 200 are used. Thus, as shown in FIG. 6, about 6 mm of the undercoat layer 12 is applied to the healthy portion 11 of the exposed surface on both side walls of the water channel structure 10. Next, as shown in FIG. 7, on the surface of the layer 12 of the flattened undercoat mortar, as shown in FIG. 7, an alkali-resistant glass fiber having an elastic modulus of about 74 GPa or more as a sheet made of fibers having an elastic modulus of 20 GPa or more. The fabric type net “TD5 × 5” (trade name) F made of At this time, the floor-side lower end of the alkali-resistant glass fiber net F is left on the floor surface side, and the excess portion is resistant to the floor surface of the water channel W of the channel wall structure 10. When constructing the alkali glass fiber net F, the alkali glass fiber net F is superposed so as to have a double structure. This is necessary to make the structure of the joint part strong in order to prevent water leakage from the joint part and deterioration of the structure over time.

  Then, mortar having the same composition as described above is applied continuously from above the alkali-resistant glass fiber net F, and adjusted so that the total thickness with the undercoat layer 12 is 10 mm, The surface was finished flat and smooth. Thus, the side wall surfaces of the water channel wall structure 10 have the structure shown in FIG.

  Next, a method for joining the mortar between the side wall surface and the floor surface of the water channel structure 10 will be described in detail with reference to FIGS. 9 to 12.

  After the construction of the overcoat layer 13 on both side walls of the water channel is completed, the repair method is applied to the floor surface of the water channel W. That is, the same mortar as described above is applied as the undercoat mortar layer 12, and the mortar is laid down so that overlapping portions of the alkali-resistant glass fiber net Fa are formed thereon. Further, the top coating mortar 13a is applied from above, and the same finishing as the side wall surface is also performed on the floor surface to complete the repair of the entire water channel W.

  In the construction on the floor surface, mortar joining between the side wall surface and the floor surface is performed according to the following procedure. FIG. 9A shows a state in which the undercoat mortar 12 on the side wall surface has been completed and the alkali-resistant glass fiber net F has been depressed. Here, as shown in FIG. 9 (B), the mortar of the undercoat mortar layer 12 is extended to about 5 cm along the floor surface of the water channel W, and the alkali-resistant glass fiber net F is extended to about 10 cm along the floor surface. Keep it.

  In this state, the side wall surface is overcoated and the surface is finished to obtain the state shown in FIG. Here, the top coat mortar layer 13 does not extend along the floor surface of the water channel W, but is applied to the lower end of the side wall surface, and at least 5 cm shorter than the undercoat.

  After the application of the mortar on both wall surfaces was completed, the floor surface was undercoated to form the undercoat mortar layer 12a, and then the alkali-resistant glass fiber net Fa was laid down to the state shown in FIG. The length of the alkali-resistant glass fiber net Fa on the floor surface that covers the entire surface from one inner end to the other inner end of both side wall surfaces is extended by 10 cm to the floor surface. It was laid down so as to be sufficiently overlapped with the alkali glass fiber net F. The floor coating is preferably the same day as the wall coating, but may be the next day.

  Finally, the floor surface was overcoated to form an overcoated mortar layer 13a, and the surface was finished. Through the series of steps described above, the inner joint portion between the side wall surface and the floor surface is in the state shown in FIG.

  Further, although not shown in the figure, a strong glass ceramic plate or a stone plate cut out of natural stone can be applied to the surface of the top coat mortar layer 13, and the final construction is further durable. It becomes a high structure.

  As described above, by adopting the method for repairing a concrete channel wall according to the present invention, the structural section perpendicular to the flow direction of the channel W includes a sheet made of fibers having an elastic modulus of 20 GPa or more and chopped fibers. It becomes a layered structure with a mortar base material, resulting in a very strong and highly durable composition. Also, in the concrete water channel wall repair method, work is carried out according to the procedure described above, so it is possible to make improvements in a short period of time without destroying all the old water channels, and to the surface of the cured body after construction. The generated fine cracks and cracks can be effectively suppressed.

It is explanatory drawing of the concrete water channel wall of this invention, Comprising: (A) is a fragmentary sectional perspective view, (B) is an enlarged view of the fragmentary sectional principal part X of (A). Sectional drawing which represents the healthy state immediately after completion of a waterway about the partial cross-section principal part X. Sectional drawing showing the state in which the degradation site | part before repair is recognized about the partial cross section principal part X. FIG. Sectional drawing showing the state which removed the range which extends to the weak part or the aged part, and the surrounding healthy part about the partial cross-section principal part X. Sectional drawing showing the state after performing the rust prevention process of a reinforcing bar and backfilling with mortar about partial cross section principal part X. Sectional drawing which represents the state after undercoating about the partial cross section principal part X. FIG. Sectional drawing showing the state which constructed the alkali-resistant glass fiber sheet | seat on the undercoat about the partial cross-section principal part X. FIG. Sectional drawing which represents the state after overcoating on the alkali-resistant glass fiber sheet | seat about the partial cross section principal part X. FIG. It is explanatory drawing of the concrete water channel wall of this invention, (A) is a fragmentary sectional perspective view, (B) is an enlarged view of the fragmentary sectional principal part Y of (A). Sectional drawing showing the state after coating the side wall about the partial cross-section principal part Y. Sectional drawing showing the state which constructed the sheet | seat made from an alkali-resistant glass fiber about the partial cross-section principal part Y after undercoating of a floor surface. Sectional drawing showing the state after overcoating on the alkali-resistant glass fiber sheet | seat about the partial cross-section principal part Y. FIG.

Explanation of symbols

10 Waterway wall structure 11 Concrete sound part 12, 12a Undercoat mortar (layer)
13, 13a Top coat mortar (layer)
14 Stuffed mortar 15 Deterioration site B Anticorrosion treatment layer F, Fa Sheet made of fiber with an elastic modulus of 20 GPa or more K Water absorption adjusting material S Soil T, Ta Reinforcement W Waterway

Claims (12)

A repair method for repairing a concrete channel wall in which weakened or aging parts have occurred,
A ground treatment step for removing the weakened part or the aging part and a normal wall part around the weakened part and exposing a healthy part inside the normal concrete, and a mortar base material containing organic fiber in the healthy part A method for repairing a concrete waterway wall, characterized by having a coating process for coating the concrete.   2. The method for repairing a concrete water channel wall according to claim 1, wherein the organic fiber is in the form of a chop having an average length of 1 mm or more and 50 mm or less. A repair method for repairing a concrete channel wall in which weakened or aging parts have occurred,
Coating the first mortar base material containing chopped fibers on the repaired portion of the water channel wall, attaching a burying material, and having a layered construction step of applying the second mortar base material from above. Characteristic repair method for concrete channel walls.   It has a connecting step of connecting the side surface and the floor surface continuously by embedding a burying material in the mortar base material of each of the side surface and the floor surface at the joint portion between the side surface of the water channel wall and the floor surface. The method for repairing a concrete channel wall according to claim 3.   The method for repairing a concrete channel wall according to claim 3 or 4, wherein the burying material is made of a fiber having an elastic modulus of 20 GPa or more.   The method for repairing a concrete channel wall according to any one of claims 1 to 5, further comprising a covering step of covering a plate-like material over substantially the entire coated surface coated with the mortar base material. .   The mortar base material contains cement, sand, alkali-resistant glass fiber, and water, and the mass ratio of sand to cement is in the range of 1 to 6. Repair method for concrete channel wall as described in any of the above.   The concrete water channel wall according to any one of claims 1 to 7, wherein the mortar base material contains any of vinyl acetate-ethylene copolymer, acrylic resin, and SBR resin. Repair method.   A sheet made of a fiber having an elastic modulus of 20 GPa or more in a cross section perpendicular to the flow direction of the water channel on the water channel wall by the repair method for a concrete water channel wall according to any one of claims 1 to 8, and a chopped fiber A concrete canal wall structure constructed so as to form a layered structure with a mortar base material containing   A concrete waterway structure characterized in that a buried material connecting the side surface of the waterway wall and the floor surface is buried by the method for repairing a concrete waterway wall according to any one of claims 1 to 8. body.   A laminated portion is formed in which a first burying material extending from the side surface side of the water channel wall to the floor surface and the second burying material embedded in the floor surface is laminated. The concrete water channel structure according to claim 10, wherein   The concrete water channel structure according to claim 11, wherein the burying material is a sheet-like material.

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