JP5777912B2 - Anticorrosion coating material and concrete member and method for producing them - Google Patents

Description

  The present invention relates to an anticorrosion coating material that is provided on the surface of various concrete members and serves to prevent deterioration of the concrete member, a manufacturing method thereof, and a concrete member that is coated with an anticorrosion coating material and a manufacturing method thereof.

  For example, in order to prevent early deterioration of concrete tunnels, such as shield tunnels, sand basins, manholes, sludge storage tanks, etc., which are composed of sewer facilities, etc. due to hydrogen sulfide generated from sewer facilities, etc. The surface is covered with a resin (plastic) anticorrosion material to maintain its function and improve durability.

  The above-mentioned anti-corrosion material made of resin protects the concrete member from deterioration of the concrete member due to not only hydrogen sulfide but also various acids and alkalis, cavitation by running water, and erosion by sand in running water and improves its durability. Therefore, an anticorrosion coating material made of resin that is resistant to chemical resistance and physical impact is applied.

  By the way, when the anticorrosion coating material is provided on the surface of the concrete member, it is feared that the flat or curved anticorrosion coating material is simply adhered to the surface of the concrete member. Patent Document 1 discloses a segment resin member in which a resin anchor having a reverse taper shape is provided on the back surface of a resin-like plate material, and a method of manufacturing a segment including the segment resin member.

  The resin member includes a curved resin member that covers the inner surface of the segment and is curved along the circumferential direction, and a plurality of rib members that continuously project along the axial direction of the shield tunnel on the outer surface side of the curved resin member. Is manufactured by injection molding and cutting the injection-molded rib member into a reverse taper shape with a cutter.

  Since the reverse tapered anchor is provided on the curved member surface, in view of the necessity of enabling the mold to be opened and the molded product to be removed, first, the curved member is formed by injection molding in the mold. After the rib member is integrally formed, the rib member is cut into a reverse taper shape using an NC machine.

  This manufacturing method requires a large mold for injection molding and requires a mold that requires high airtightness and liquid-tightness in the mold closing position, and further requires high-pressure and high-speed injection equipment for this injection molding. Cost will become expensive.

  Accordingly, an anticorrosion coating material comprising a surface portion covering the surface of a concrete member and an anchor portion attached to the surface portion, manufactured by a manufacturing method other than injection molding, and having a structure in which the surface portion and the anchor portion are welded together And development of the manufacturing method of the anti-corrosion coating material which can manufacture this anti-corrosion coating material much cheaply compared with the case of injection molding is anxious in the said technical field.

JP 2001-220994 A

  The present invention has been made in view of the above-described problems, and is manufactured by a manufacturing method that is not injection molding, and has a structure in which a surface portion and an anchor portion are welded together, and this anticorrosion coating material in the case of injection molding. It aims at providing the manufacturing method of the anticorrosion coating | covering material which can be manufactured much cheaply compared with this, the concrete member by which the surface was coat | covered with this anticorrosion coating | covering material, and the manufacturing method of this concrete member.

  In order to achieve the above object, the anticorrosion coating material according to the present invention includes a surface portion made of a thermoplastic resin, a bottom portion to be welded to the surface portion, and two protrusions that rise in a tapered shape from both ends of the bottom portion. And a bottom part and an anchor part made of a thermoplastic resin, and the anchor part is embedded in the concrete member, and the concrete member It is used for the anticorrosion.

  The anticorrosion coating material of the present invention is formed from a surface portion covering the surface of a concrete member to be anticorrosion, and an anchor portion welded to the surface portion and embedded in the concrete member. A bottom part to be welded to the surface part, and two protrusions that rise in a tapered shape from both ends of the bottom part, and a protrusion that gradually widens between both protrusions, Like the surface portion, it is made of a thermoplastic resin.

  That is, the surface portion and the anchor portion are not integrated with each other by injection molding, but both are welded and integrated, and the manufacturing cost is much lower than that by injection molding.

  Examples of the shape when the anchor portion is cut in a longitudinal section include a U-shape, and a shape (U-shaped or substantially U-shaped) in which the U-shape is open in a direction protruding from the surface portion (outside). The portion welded to the surface portion of the anchor portion preferably has a linear region or a curved region complementary to the surface portion in order to ensure weldability with the surface portion.

  In addition, both the surface portion and the anchor portion are made of a thermoplastic resin, and both are easily softened or melted into a shape corresponding to the cavity shape in a mold in a high temperature atmosphere, and a part of both is welded. Thus, the anticorrosion coating material having a desired shape is obtained by being integrated and cooled, and the anticorrosion coating material is obtained by integrating the surface portion and the anchor portion of abundant shape variations with a welded portion having high adhesive strength.

  “Softening or melting” of a thermoplastic resin means that when the thermoplastic resin is made of an amorphous plastic, “softening” is applied to the state exceeding the glass transition point Tg, and the thermoplastic resin is crystalline. In the case of plastic, "melting" is applied to the state exceeding the melting point Tm.

  Non-crystalline plastics that have a very low degree of crystallinity or cannot be crystallized include polystyrene (PS), polyvinyl chloride (PVC), polymethyl methacrylate (PMMA), ABS resin, thermoplastic epoxy, etc. Can be mentioned. On the other hand, those having a high ratio of the amount of crystal regions in which molecular chains are regularly arranged, that is, crystalline plastics having high crystallinity include polyethylene (PE), polypropylene (PP), nylon (PA: nylon 6, nylon 66). Etc.), polyacetal (POM), polyethylene terephthalate (PET) and the like. In particular, an acrylic-modified high impact vinyl chloride resin plate having good vacuum formability and excellent corrosion resistance such as chemical resistance is preferable. As the plate, “KYDEX (Kidex ( Registered trademark)) plate ”.

  As described above, the shape of the surface portion is an arbitrary shape according to the surface shape of the concrete member to be protected against corrosion. For example, a two-dimensional plane, a three-dimensional plane composed of two or more inclined planes, one Examples thereof include a curved surface having one curvature, a curved surface composed of two or more curvatures, and a three-dimensional shape composed of a flat surface and a curved surface.

  The present invention extends to a concrete member. In this concrete member, an anchor portion constituting an anticorrosion coating material is embedded therein, and a surface portion covers the surface thereof.

  Since the protrusions constituting each anchor part described above in the concrete member rise in a taper shape and the width between the protrusions gradually widens, it is embedded in the concrete member at intervals. The concrete area surrounded by the protrusions of both of the two anchor portions is gradually reduced in width, and this concrete area exhibits an anchor effect (or an anti-disengagement effect) by the protrusions of both of the adjacent anchor portions. It will be.

  Examples of the concrete member coated with the anticorrosion coating material of the present invention include concrete segments that constitute shield tunnels, concrete floors, walls, and pillars that constitute sand basins, manholes, sludge storage tanks, and the like. .

  Further, the present invention extends to a method for manufacturing an anticorrosion coating material, and one embodiment of this manufacturing method grips both ends of the first and second sheets made of thermoplastic resin with a pair of clamps. A first step in which the paired first and second molds are positioned at a position sandwiching the first and second sheets, the first mold has a vacuuming hole, and the sheet Opposite cavity surfaces have irregularities, the second mold also has a vacuum evacuation hole, and the first and second sheets are softened or melted by setting both molds to a high temperature atmosphere, Vacuum suction is performed from the vacuum drawing hole, and the hollow needle is passed through either the first or second mold, and further, one of the first or second sheet is further passed through, so that the first and second sheets are passed through. The first sheet is processed into a concavo-convex shape by providing a pressure fluid in between The second step of welding the concave portion to the second sheet and manufacturing the intermediate body in which the convex portion protrudes from the second sheet, by cutting the continuous convex portion at the middle position thereof, the second step A bottom portion welded to the surface portion molded from the first sheet on the surface of the surface portion formed from the sheet, and two protrusions rising in a tapered shape from both ends of the bottom portion, and between the two protrusions The third step is to manufacture a corrosion-resistant coating material in which a plurality of anchor portions composed of protrusions whose width is gradually widened are welded.

  The production method of the present invention is a thermoforming method in which two sheets are simultaneously molded (a method in which a thermoplastic resin sheet is heated and softened or melted to bring both sheets into close contact with a corresponding mold). The so-called twin composite molding method is applied (Twin Composite is a registered trademark).

  In the first and second steps, the above-described twin composite molding method is applied, and the other thermoplastic resin sheet in which the concave portion and the convex portion are continuous on the surface of the surface portion made of one thermoplastic resin sheet (second sheet) ( The intermediate body formed by thermally welding the concave portion of the first sheet) is manufactured. A hollow space is formed between the convex portions between the second sheet forming the surface portion and the first sheet. The hollow space in the convex portion is formed by processing the first sheet into a concavo-convex shape by vacuum suction from the vacuuming holes of the first and second molds, and processing the second sheet into, for example, a flat shape. Further, the hollow needle is allowed to pass through one of the molds and one of the sheets, and is faced between the first and second sheets, thereby providing a pressure fluid (pressure air or the like) to the first. It is formed between the convex part of this sheet and the second sheet.

  In this intermediate body, an anchor portion composed of a bottom portion and two projecting portions rising in a tapered shape from both ends of the bottom portion is not yet formed.

  The intermediate body is removed from the mold, and a plurality of convex portions that are continuous at intervals are cut at intermediate positions by, for example, an NC cutting machine, so that the convex portion (hollow space) is opened to the outside. Then, an anchor portion including a bottom portion and two protrusions rising in a tapered shape from both ends of the bottom portion is formed (third step).

  According to the manufacturing method of the present invention, by applying a so-called twin composite molding method, a molding die requiring high airtightness or liquid tightness and a high-pressure and high-speed injection equipment are required, and the equipment cost is extremely expensive. Compared to molding, the manufacturing cost can be reduced significantly. That is, the first and second molds applied by the twin composite molding method can be manufactured by cutting a metal plate, for example, and the cost merit becomes more remarkable as the mold size increases. In extrusion molding, which is one of representative molding methods other than injection molding, it is extremely difficult to produce an anticorrosion coating material having a surface portion made of a large plate of about 1.2 m × 3 m, for example, A member having a small width is assembled by a joint to form a desired large-sized surface portion, which takes time and effort.

  In addition, when the convex portion is cut by an NC cutting machine, necessary anti-corrosion coating material having a plane portion having a desired plane contour is manufactured by performing necessary drilling processing and precision cutting processing of the outer periphery of the surface portion. be able to.

  In another embodiment of the method for producing an anticorrosion coating material according to the present invention, a second sheet made of a thermoplastic resin, prepared by vacuum forming a first sheet having an uneven shape, and made of a thermoplastic resin. The first step of preparing the sheet, of the first and second molds that make a pair, the first mold has a concave and convex cavity surface facing the sheet, The second sheet is laminated to form a laminated body, both molds are placed in a high temperature atmosphere to soften or melt the first and second sheets, and the convex part of the first sheet is the concave part of the first mold. The laminate is press-fitted in the cavities of the first and second molds so as to be loosely fitted to each other, whereby the concave portion of the first sheet is welded to the second sheet, and the convex portion is The second step of manufacturing the intermediate body protruding from the sheet, the continuous convex part is in the middle of them And a bottom portion welded to the surface portion molded from the first sheet, and two protrusions rising from both ends of the bottom portion in a tapered shape. The third step of manufacturing the anticorrosion coating material, in which a plurality of anchor portions composed of the protrusions, the width of which is gradually increased, is welded.

  In the present embodiment, the first sheet is formed into a concavo-convex shape in advance by applying a vacuum forming method, and the first and second sheets are welded together in a separate mold to produce an intermediate. Is. Also by this method, the anticorrosion coating material can be manufactured at a low manufacturing cost of the comparative example.

  In another embodiment of the method for producing an anticorrosion coating material according to the present invention, a parison is formed by extruding a thermoplastic resin into a mold having an uneven cavity surface and a planar cavity surface. The sheet is in a continuous stacked posture by pressing the parison against the cavity surface, pressing the first and second molds, and pressurizing the flat sheet portion. The first step of manufacturing the intermediate body in which the concave portion of the uneven sheet portion is welded and the convex portion protrudes from the planar sheet portion, the continuous convex portion is cut at the middle position thereof, and the second step A bottom portion welded to the surface portion molded from the first sheet on the surface of the surface portion formed from the sheet, and two protrusions rising in a tapered shape from both ends of the bottom portion. Width A second step of projections extends s, a plurality of anchor portions constructed from will produce inhibitive coating made is welded, it is made of.

  This embodiment applies blow molding to form a laminated body by forming a concavo-convex sheet portion and a planar sheet portion while expanding a continuous sheet, and further welding both to form an intermediate body. To manufacture. Also by this method, the anticorrosion coating material can be manufactured at a low manufacturing cost of the comparative example.

  Furthermore, the method for manufacturing a concrete member according to the present invention includes setting the anticorrosion coating material manufactured by the above manufacturing method together with a mold, filling the mold with concrete, and removing the mold, thereby removing the anticorrosion coating material inside. A concrete member in which an anchor portion is embedded and a surface portion of an anticorrosion coating material is coated on the surface thereof is manufactured.

  For example, when manufacturing a concrete segment, the anticorrosion coating material is placed in the segment formwork, the reinforcement is placed in the formwork, the concrete is filled, and it hardens. The segment having the anchor portion embedded therein and the surface protected by the surface portion of the anticorrosion coating material can be manufactured.

  For a concrete member having a curved surface such as a segment, the surface portion constituting the anticorrosion coating material is formed from a sheet-like thermoplastic resin, so that it can be easily deformed to have a desired curved shape. be able to.

  As can be understood from the above description, according to the anticorrosion coating material and the concrete member of the present invention and their manufacturing method, the surface portion and the anchor portion constituting the anticorrosion coating material are not formed by injection molding, and both are inexpensive molds. Since it is thermoformed, welded and integrated, the production cost of the anticorrosion coating material and the concrete member can be significantly reduced as compared with the conventional production method by injection molding.

It is the schematic diagram explaining the 1st step of one Embodiment of the manufacturing method of the anticorrosion coating | covering material of this invention. FIG. 2 is a schematic diagram illustrating a second step after FIG. 1. FIG. 3 is a schematic diagram illustrating a second step after FIG. 2. (A) is a longitudinal cross-sectional view of the intermediate body manufactured at the 2nd step, (b) is b arrow directional view (plan view) of (a). (A) is a schematic diagram illustrating an embodiment of the anticorrosion coating material manufactured after explaining the third step after FIGS. 3 and 4, and (b) is a view taken in the direction of arrow b in (a). Is a plan view). (A), (b) is a schematic diagram which shows other embodiment of an anticorrosion coating | covering material together. (A), (b) is the schematic diagram which demonstrated the 1st, 2nd step of other embodiment of the manufacturing method of an anticorrosion coating | covering material in order. (A), (b) is the schematic diagram explaining the 1st, 2nd step of further another embodiment of the manufacturing method of an anticorrosion coating | covering material in order. (A) is explanatory drawing which shows one Embodiment of the manufacturing method of a concrete member, (b) is a longitudinal cross-sectional view which shows one Embodiment of the concrete member manufactured with the manufacturing method of (a). It is the figure which expanded the X section of FIG. 9, Comprising: It is the schematic diagram explaining that the anchor effect was exhibited in the concrete area | region enclosed by the protrusion of each adjacent anchor part. It is a schematic diagram which shows other embodiment of the concrete member of this invention.

  Hereinafter, with reference to the drawings, an embodiment of the anticorrosion coating material and the concrete member of the present invention and the manufacturing method thereof will be described.

(Embodiment 1 of manufacturing method)
FIGS. 1 to 5 are flowcharts illustrating, in order, the first embodiment of the method for manufacturing the anticorrosion coating material of the present invention. Specifically, FIG. 1 is a schematic diagram illustrating the first step of the method of manufacturing the anticorrosion coating material of the present invention, and FIGS. 2 and 3 are schematic diagrams illustrating the second step in order. FIG. 5 is a diagram for explaining the intermediate produced in the second step, and FIG. 5 is a schematic diagram for explaining an embodiment of the anticorrosion coating material produced in conjunction with the third step.

  The manufacturing method shown in the figure applies a so-called twin composite molding method, which is a thermoforming method of simultaneously molding two sheets.

  First and second sheets S1 and S2 made of two thermoplastic resins are held and fixed by a pair of clamps 3 and 3, and a pair of first and second molds 1 and 2 are first and second. Is positioned at a position where the sheets S1 and S2 are sandwiched (first step).

  Here, even if the thermoplastic resin that is the material for forming the first and second sheets S1 and S2 is an amorphous plastic that has a very low degree of crystallinity or cannot be crystallized, the molecular chain is It may be a crystalline plastic having a high ratio of the amount of regularly arranged crystal regions, that is, a crystalline plastic with a high degree of crystallinity. In the case of an amorphous plastic, for example, polystyrene (PS), polyvinyl chloride (PVC), polymethyl methacrylate (PMMA), ABS resin, thermoplastic epoxy, etc. can be applied. For example, polyethylene (PE), polypropylene (PP), nylon (PA: nylon 6, nylon 66, etc.), polyacetal (POM), polyethylene terephthalate (PET), etc. can be applied. In particular, an acrylic-modified high-impact vinyl chloride resin plate having good vacuum formability and excellent corrosion resistance such as chemical resistance is preferable, and “KYDEX” manufactured by Sekisui Chemical Co., Ltd. is used as the plate. Plate ".

  The first mold 1 corresponding to the first sheet S1 is provided with an evacuation hole 1d for evacuating the cavity, and the cavity surface 1a facing the first sheet S1 is uneven. (Concave surface 1b, convex surface 1c).

  On the other hand, the cavity surface 2a of the second mold 2 is flat, and an evacuation hole 2b for evacuating the cavity is provided.

  The first and second molds 1 and 2 are not expensive molds that require high airtightness (airtightness or liquid tightness) of the cavities, such as injection molds. These can be manufactured by cutting, and molds 1 and 2 that are inexpensive and can be prepared in a short time from small to large can be prepared.

  In addition, both or either one of the first and second molds 1 and 2 can be automatically controlled for mold closing and mold opening by a lifting mechanism (not shown) that is movable up and down. Good.

  A pair of clamps 3 and 3 hold the first and second sheets S1 and S2 made of a thermoplastic resin (for example, KAIDEX plate) and are positioned with the first and second molds 1 and 2 sandwiched therebetween. Then, as shown in FIG. 2, the first and second molds 1 and 2 are heated by heating means (not shown) (such as a heater built in the mold). The second molds 1 and 2 are brought into close contact with the first and second sheets S1 and S2, respectively (X1 direction and X2 direction).

  In particular, in the first mold 1, the first sheet S1 and the cavity that are softened or melted in a high-temperature atmosphere by heating the first mold 1 through the evacuation hole 1d. The surface 1a is evacuated (Y1 direction), the first sheet S1 is brought into close contact with the concave surface 1b and the convex surface 1c forming the cavity surface 1a, and the first sheet S1 is continuously connected with the convex portions S1a and the concave portions S1b. The shape is deformed. At the same time, the second sheet S2 and the cavity surface 2a are evacuated from the evacuation hole 2b of the second mold 2 (in the Y2 direction) to bring them into close contact with each other.

  Here, “softening or melting” means “softening” when the first and second sheets S1 and S2 are made of amorphous plastic and the glass transition point Tg is exceeded. In the case of the crystalline plastic, the state exceeding the melting point Tm is “melting”, and both indicate that the first and second sheets S1 and S2 can be in close contact with each other in a high temperature atmosphere. .

  Next, either or both of the first and second molds 1 and 2 are moved up and down so as to approach each other, and further through the hollow needle insertion portion 1e of the first mold 1 and further the first sheet S1. By passing the hollow needle N between the first and second sheets S1 and S2 through the air and providing pressure air from the hollow needle N (Y3 direction), as shown in FIG. 3, the first sheet The concave portion S1b of S1 is welded to the second sheet S2 (welded portion M), and a hollow space P is formed between the convex portion S1a of the first sheet S1 and the second sheet S2. Note that the pressure air blown from the hollow needle N used when the first and second sheets S1, S2 are twin-composited is adjacent to the convex portion S1a through which the hollow needle N is inserted in FIG. A communication hole (not shown) is formed between the convex portions S1a and the S1a between the convex portions S1a and the additional convex portions S1a adjacent to the convex portions S1a. Since they are in communication with each other, they reach the other convex portion S1a through this communication hole.

  When the softened or melted first and second sheets S1 and S2 are cured, the first and second molds 1 and 2 are opened, and the contact end portions of the first and second sheets S1 and S2 are cut. Then, by releasing from the clamps 3 and 3, the intermediate body 10 ′ of the anticorrosion coating material shown in the longitudinal sectional view of FIG. 4a and the perspective view of FIG. 4b (b arrow view of FIG. 4a) is manufactured (second). Step).

  Here, as shown in FIG. 4 a, the first sheet S <b> 1 is removed from the first mold 1 because the side surface of the convex portion S <b> 1 a (corresponding to a tapered protrusion S <b> 1 c <b> 2 described later) is inclined. At this time, it has been proved by the present inventors that the first sheet S1 can be peeled off from the cavity surface of the first mold 1 very smoothly without tearing. According to the present inventors, if the side surface of the convex portion is a vertical surface (and therefore the cavity surface of the mold is also vertical), the side surface of the convex portion is difficult to peel off from the cavity surface of the mold during demolding. It has also been identified that it is easy to break.

  Next, by cutting with NC cutting machine along the line L set to the arbitrary height level of several convex part S1a shown in FIG. 4a, the longitudinal cross-sectional view of FIG. 5a, and the perspective view of FIG. As shown in FIG. 5a (b arrow view), an anchor portion S1c having a bottom portion S1c1 and two projecting portions S1c2 and S1c2 rising from both ends thereof in a tapered shape and having a substantially U-shaped cross-sectional view, and the anchor portion The anticorrosion coating material 10 composed of the surface portion made of the second sheet S2 to which the bottom portion S1c1 of S1c is welded is manufactured (third step). In order to more specifically explain an example of the cutting method, in a method of cutting the upper surface of the convex portion S1a by a rotary shaft attached to an NC cutting machine (lathe) in a vertical posture and a rotary cutting cutter attached to the tip thereof, An example of the cutting order is a method in which the rotary cutting cutter performs cutting while sequentially moving the peaks of the convex portion S1a.

  As shown in FIG. 5a, when a plurality of anchor portions S1c,... Constituting the anticorrosion coating material 10 are embedded in a concrete member (not shown), protrusions S1c2 constituting the anchor portions S1c,. However, since the width between the protrusions S1c2 and S1c2 gradually increases, the protrusions of both the two anchor portions S1c and S1c embedded in the concrete member with a gap therebetween. The concrete region Q surrounded by the portions S1c2 and S1c2 is gradually reduced in width, and the concrete region Q is anchored by the protrusions S1c2 and S1c2 of both the adjacent anchor portions S1c and S1c (or the drop prevention effect). ) Will be played. This will be described later with reference to FIG.

  According to the manufacturing method of the anticorrosion coating material to which the twin composite molding method shown in the figure is applied, the mold manufacturing cost is much lower than the case of manufacturing the anticorrosion coating material by the conventional injection molding method, and the injection Since the high-pressure and high-speed injection equipment required for the molding method is not required, the production cost of the anticorrosion coating material is significantly reduced.

  In addition, when cutting the convex part S1a with an NC cutting machine, necessary anti-corrosion coating material having a plane part with a desired plane contour is manufactured by performing necessary drilling and precision cutting of the outer periphery of the surface part. can do.

  The anticorrosion coating material composed of the surface portion and the anchor portion includes other embodiments as shown in FIGS. 6a and 6b, for example.

  The anticorrosion coating material 10A shown in FIG. 6a is provided with a number of convex portions that are square in cross-section at intervals in the vertical and horizontal directions, instead of the anticorrosion coating material 10 in which a plurality of convex portions are formed on the planar surface portion S2. In other words, a U-shaped anchor portion S1c ′ in a sectional view is formed from two adjacent convex portions.

  On the other hand, the anticorrosion coating material 10B shown in FIG. 6b has a plurality of convex portions formed on the curved surface portion S2 ″, and a U-shaped anchor portion S1c as shown in FIG. This is an anticorrosion coating material used for anticorrosion of the inner surface of, for example, a concrete member made of a segment having a curved surface. In addition to the curved shape shown at room temperature, the surface portion S2 "is formed of a relatively flexible thermoplastic resin so that the surface portion S2" is flat at room temperature. The posture may be changed as shown in the figure by bending the surface portion S2 "when the concrete segment is manufactured in the mold.

  Moreover, as the cross-sectional view shape of the U-shaped or substantially U-shaped anchor portion in cross-section, there are three straight portions as shown in FIGS. 5 and 6 (a straight portion welded to the second sheet S2 and a taper from this straight portion. In addition to a shape form (anchor part S1c shown in FIG. 7a) composed of two straight parts spreading in a shape, such as an anchor part S1c ″ shown in FIG. There may be various shapes that can be expected to have an anchor effect by the anchor portion.

(Embodiment 2 of manufacturing method)
FIGS. 7a and 7b explain the first and second steps of another embodiment of the method of manufacturing the anticorrosion coating material in this order. Note that the third step of the present embodiment is the same as the third step of the first embodiment shown in FIG.

  First, a first sheet S1 ′ made of a thermoplastic resin and having an uneven shape is manufactured in advance by vacuum forming, and a planar second sheet S2 ′ made of this and a thermoplastic resin is prepared (first). 1 step).

  Of the first and second molds 1A and 2A that form a pair, the first mold 1A has a cavity surface 1a that faces the sheet having an uneven shape (concave part 1c, convex part 1b), and is prepared. The first sheet S1 ′ and the second sheet S2 ′ are laminated to form a laminated body, and the first sheet S1 ′ and the second sheet S2 ′ are softened by setting both molds 1A and 2A to a high temperature atmosphere. Alternatively, it is melted (see FIG. 7a).

  Next, as shown in FIG. 7b, the laminate is first and second metallized so that the convex part S1'a of the first sheet S1 'is loosely fitted in the concave part 1c of the first mold 1A. By applying pressure in the cavity of the mold, the concave portion S1′b of the first sheet S1 ′ is welded to the second sheet S2 ′, and the convex portion S1′a protrudes from the second sheet S2 ′ to form a hollow space. An intermediate with P is produced (second step).

  Even with the manufacturing method shown in the figure, the mold production cost is much lower than when the anticorrosion coating material is manufactured by the conventional injection molding method, and the high-pressure and high-speed injection equipment required for the injection molding method is not required. Therefore, the production cost of the anticorrosion coating material is significantly reduced.

(Embodiment 3 of manufacturing method)
FIGS. 8a and 8b illustrate the first step of still another embodiment of the method for manufacturing the anticorrosion coating material in this order. The second step of the present embodiment is the same as the third step of the first embodiment shown in FIG.

  First, as shown in FIG. 8a, the thermoplastic resin is extruded from the extruder 3 into the first and second molds 1B and 2B having the concave and convex cavity surface 1a and the flat cavity surface 2a, and the parison. p is formed.

  The first and second molds 1B and 2B are closed to continuously integrate the parison p, and the pressure fluid is supplied into the parison p that is continuously integrated from the blow-in holes 3a provided in the extruder 3. This is expanded, and the parison p is pressed against the cavity surfaces 1a and 2a.

  By pressurizing the first and second molds 1B and 2B, the sheet portion S1 "and the sheet portion S2 made of two rows of continuous parisons p are in a stacked posture, and an uneven sheet is formed on the planar sheet portion S2. The concave portion S1 ″ b of the portion S1 ″ is welded, and the convex portion S1 ″ a protrudes from the planar sheet portion S2 to produce an intermediate body having a hollow space P (first step).

  Even with the manufacturing method shown in the figure, the mold production cost is much lower than when the anticorrosion coating material is manufactured by the conventional injection molding method, and the high-pressure and high-speed injection equipment required for the injection molding method is not required. Therefore, the production cost of the anticorrosion coating material is significantly reduced.

  Next, an embodiment of the method for producing a concrete member of the present invention will be outlined with reference to FIG.

  FIG. 9 a illustrates a situation in which a side wall, which is a concrete member, is manufactured (constructed) on the bottom slab T of a concrete sand basin constituting a sewerage facility or the like.

  In this side wall construction method (manufacturing method), after the bottom plate T is constructed, the reinforcing bars R (longitudinal and transverse bars) for the side walls are arranged, the inner and outer molds K and K are assembled, and the inner mold K After the anticorrosion coating material 10 is assembled on the inner surface of the steel sheet, fresh mold FC is filled into the mold as shown in the figure.

  By waiting for hardening of the fresh concrete FC and demolding, as shown in FIG. 9B, the anchor portion S1c constituting the anticorrosion coating material 10 is embedded inside the side wall, and the inner surface thereof forms the surface portion S2 constituting the anticorrosion coating material 10. The concrete member 100 (side wall) covered with is constructed (manufactured).

  Here, FIG. 10 is an enlarged view of the portion X in FIG. 9 and shows a schematic diagram illustrating that the anchor effect is exhibited in the concrete region surrounded by the protrusions of the adjacent anchor portions. Yes.

  As shown in the figure, when the plurality of anchor portions S1c,... Constituting the anticorrosion coating material 10 are embedded in the concrete member 100, the protrusions S1c2 constituting the anchor portions S1c,. Since the width between the protrusions S1c2 and S1c2 gradually increases, the protrusions S1c2 and S1c2 of the two anchor parts S1c and S1c that are embedded in the concrete member at an interval are provided. The concrete region Q (shaded area in the figure) surrounded by the width of the concrete region Q gradually decreases, and this concrete region Q is anchored by the protrusions S1c2, S1c2 of the adjacent anchor portions S1c, S1c (or Effect of preventing omission).

  As the concrete member, in addition to the concrete member 100 shown in FIG. 9, as shown in FIG. 11, for example, an anchor portion S <b> 1 c constituting the anticorrosion coating material 10 </ b> B is embedded in the concrete segment to constitute the anticorrosion coating material 10 </ b> B. A concrete segment (concrete member 100A) in which the surface portion S2 ″ to cover the inner surface of the segment can be mentioned.

  As described above, the anticorrosion coating material 10B is made of a thermoplastic resin having a flexible surface portion S2 ″. Therefore, the anticorrosion coating material 10B is placed in a mold, and a reinforcing bar is arranged to make fresh concrete. When producing a concrete segment by filling, it is possible to produce a concrete segment by easily deforming into a curved shape having a desired curvature and placing it in a mold.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and there are design changes and the like without departing from the gist of the present invention. They are also included in the present invention.

DESCRIPTION OF SYMBOLS 1,1A, 1B ... 1st metal mold | die, 1a ... Cavity surface, 1b ... Concave surface, 1c ... Convex surface, 1d ... Hole for vacuum drawing, 1e ... Hollow needle insertion part, 2, 2A, 2B ... 2nd metal mold | die 2a ... cavity surface, 2b ... vacuum hole, 10, 10A, 10B ... anticorrosion coating material, 10 '... intermediate of anticorrosion coating material, 100,100A ... concrete member, S1, S1', S1 "... first Sheet, S2, S2 "... second sheet (surface part), S1a, S1'a, S1" a ... convex part, S1b, S1'b, S1 "b ... concave part, S1c, S1c ', S1c" ... anchor Part, S1c1 ... bottom, S1c2 ... projection, P ... hollow space, N ... hollow needle, p ... parison

Claims (4)

Both ends of the first and second sheets made of thermoplastic resin are gripped by a pair of clamps, and the paired first and second molds are positioned so as to sandwich the first and second sheets. The first step,
The first mold has a vacuuming hole, and the cavity surface facing the sheet is uneven, and the second mold also has a vacuuming hole. The first and second sheets are softened or melted as a high-temperature atmosphere, and vacuum suction is performed through the vacuum pulling hole, and the hollow needle is passed through one of the first and second molds. The first sheet is processed into a concavo-convex shape by passing either one of the sheets through the first and second sheets and providing a pressure fluid, and the concave portion is formed into the second sheet. A second step of producing an intermediate body in which the convex portions protrude from the second sheet,
By cutting continuous convex portions at intermediate positions thereof, the bottom portion welded to the surface portion molded from the first sheet on the surface of the surface portion molded from the second sheet, and both ends of the bottom portion A third anti-corrosion coating material is produced by welding a plurality of anchors composed of two protrusions rising in a tapered shape from the two protrusions and the width between the protrusions gradually increasing. A method for producing an anticorrosion coating material comprising steps. A first step of preparing a first sheet made of a thermoplastic resin and having an irregular shape by vacuum forming, and preparing a second sheet made of a thermoplastic resin;
Of the first and second molds forming a pair, the first mold has a concave and convex cavity surface facing the sheet, and the first sheet and the second sheet are laminated to form a laminate. And the first and second sheets are softened or melted by setting both molds in a high temperature atmosphere so that the convex portions of the first sheet are loosely fitted into the concave portions of the first mold. Is pressed in the cavities of the first and second molds, so that the concave portion of the first sheet is welded to the second sheet, and an intermediate body in which the convex portion protrudes from the second sheet is manufactured. Two steps,
By cutting continuous convex portions at intermediate positions thereof, the bottom portion welded to the surface portion molded from the first sheet on the surface of the surface portion molded from the second sheet, and both ends of the bottom portion A third anti-corrosion coating material is produced by welding a plurality of anchors composed of two protrusions rising in a tapered shape from the two protrusions and the width between the protrusions gradually increasing. A method for producing an anticorrosion coating material comprising steps. A thermoplastic resin is extruded into a mold having an uneven cavity surface and a planar cavity surface to form a parison, a pressure fluid is provided in the parison to inflate, and the parison is pressed against the cavity surface. The second mold is closed and pressed to form a sheet in a continuous stacking posture, where the concave portion of the concave and convex sheet portion is welded to the flat sheet portion, and the convex portion is a flat sheet portion. A first step of producing an intermediate projecting from
By cutting continuous convex portions at intermediate positions thereof, the bottom portion welded to the surface portion molded from the first sheet on the surface of the surface portion molded from the second sheet, and both ends of the bottom portion A second anti-corrosion coating material comprising a plurality of anchor portions each having a plurality of anchor portions welded to each other, the two protrusions rising in a tapered shape from each other and having a width that gradually increases between the two protrusions. A method for producing an anticorrosion coating material comprising steps. An anticorrosion coating material is produced by the production method according to claim 1,
The inhibitive coating set with mold,
Fill the formwork with concrete,
A concrete member manufacturing method for manufacturing a concrete member in which an anchor portion of an anticorrosion coating material is embedded therein and a surface portion of the anticorrosion coating material is coated on the surface by demolding.

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