JP2008088715A - Concrete structure reconstructing method, concrete structure producing method, and corrosion resistant member for use in the methods - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a concrete structure reconstructing method providing an excellent corrosionproofing effect (corrosion resistant effect) and capable of being implemented quickly and inexpensively, and to provide a concrete structure constructing method, and a concrete structure constructed by the methods. <P>SOLUTION: The concrete structure reconstructing method is composed of a step in which a cylindrical corrosion-proof member 1 formed by connecting both edges of a synthetic resin thin plate having flexibility is curved along an axial direction a1, and introduced into an internal space 400 of the concrete structure. Then the curved cylindrical corrosion-proof member 1 restores the cylindrical shape before deformation in the internal space 400, and supported by a support member 8 from inside so that a gap g1 is defined between the internal wall surface 40 of the concrete structure and the rear surface 11 of the corrosion-proof member 1. Then a back-filling material 5 is filled in the gap g1, and the internal wall surface 40 of the concrete structure and the corrosion-proof member are coupled to each other in one body. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for restructuring a concrete structure, a method for producing a concrete structure, and an anticorrosive member that can be used in these methods.

  In general, a sewerage facility has a drainage pipe constituting a sewer network, a manhole for maintaining and managing the sewer network, and a purification treatment tank for sewage collected through the sewer network. These are organically connected. These drain pipes, manholes, purification tanks and the like are usually structures made of concrete materials.

  It is known that this type of concrete structure is susceptible to deterioration such as corrosion on the inner wall surface depending on the use environment. For example, drainage pipe networks of sewerage facilities contain domestic wastewater including manure, various waste liquids discharged from industrial facilities, and rainwater containing sulfur oxides. Hydrogen sulfide gas generated from these wastewaters As a result, the drainage pipe, the manhole, and the inner wall surface of the purification treatment tank are corroded.

  If the corroded portion of the inner wall of the concrete structure described above is left without repair, the corroded surface will crack due to earth pressure from the surrounding area, and there is a risk of causing a water leakage accident or collapse accident due to this crack. Extremely high. Therefore, it is important to repair (reconstruct) the corroded surface as soon as possible for the concrete structure whose inner wall surface is corroded.

  In general, as technical problems required for the reconstruction work of this kind of existing concrete structure, firstly, it is important that it can be executed by a simple method and can be executed by a small-scale facility. For example, in the reconstructing work of existing manholes, the conventional mainstream replacement method is a method of removing existing manholes by excavation and burying new manholes. As described above, according to the construction method in which the equipment required for the construction becomes large, a burden on general traffic will be excessively generated, such as the need to stop all traffic at each construction. Therefore, there is a problem that the existing manhole cannot be repaired substantially on a main road that is not preferable to cause a serious traffic jam or a busy downtown.

  Second, it is desirable that the repair work for the existing concrete structure has a configuration that can shorten the construction period. As already mentioned, in the repair work of existing manholes, consideration must be given to reducing the burden on ordinary traffic. According to the construction method in which the equipment required for the construction becomes large-scale, in addition to the repair work of the inner wall surface of the manhole, the transport, installation, and removal work of the construction equipment are required. Therefore, the construction period is inevitably prolonged, and there is a problem that the traffic congestion becomes chronic in the construction area.

  Thirdly, a general manhole is configured such that the diameter of the opening portion is about 600 mm and the diameter of the internal space is about 900 mm, and the opening portion is narrower than the internal space. Therefore, the anticorrosion member has a size that can be guided from the opening to the inner space, and has a large capacity that can follow the inner wall surface of the manhole as much as possible to make the most effective use of the inner space. Must meet conflicting requirements.

  In order to solve the above-described problem, for example, in Patent Document 1, a bottomed cylindrical synthetic resin anticorrosive member is folded into a small size and inserted into an existing manhole, and then heated steam is introduced to protect the anticorrosive member from the original. A repair method is disclosed in which the shape is restored, a filler is poured into the gap between the peripheral wall of the anticorrosion member and the peripheral wall of the existing manhole, and the anticorrosion member is fixed to the inner surface of the peripheral wall.

  However, according to Patent Document 1, the anticorrosion member must have a sealed structure that prevents the introduced heated steam from leaking to the outside, so that the manufacturing cost increases accordingly. Moreover, since the heating steam supply device is required for the restoration work of the anticorrosion member, the construction cost is increased and the construction period is lengthened. Furthermore, since a highly skilled technique is required for the folding work and the restoration work of the anticorrosion member, the construction cost is increased and the construction period is prolonged.

  Patent Document 2 discloses a step of reducing the diameter of a cylindrical plastic anticorrosion member cut in one longitudinal direction and inserting it into a manhole, and expanding the diameter of the anticorrosion member after insertion to cover the inner wall surface of the manhole. There is disclosed a manhole repair method including a process and a lining process in which a liquid curable injection material for lining is filled in the gap between the inner wall surface of the manhole and the anticorrosive member and cured.

However, according to Patent Document 2, the cylindrical anticorrosion member is cut at one place in the vertical direction, and cannot be stably made independent until this cut place is connected, so the construction efficiency is poor. Moreover, since the connection operation | work of the cut location mentioned above and the sealing operation | work of a seam will be performed in a narrow manhole, construction efficiency is bad. Furthermore, even if the connecting work and the sealing work are performed in a narrow manhole, it is difficult to maintain the accuracy of the work, so the reliability of the repair effect is impaired.
Japanese Patent No. 2555253 JP 2641713 A

  An object of the present invention is to provide a concrete structure reconstruction method, a concrete structure manufacturing method, and an anticorrosive member that can be used in these methods, which can be applied quickly and inexpensively. .

  Another object of the present invention is to provide a method for restructuring a concrete structure having an excellent anticorrosion effect (corrosion resistance effect), a method for producing a concrete structure, and an anticorrosive member that can be used in these methods. That is.

  Still another object of the present invention is to reconstruct a concrete structure capable of improving the structural integrity of the concrete structure and the anticorrosion member, a method for manufacturing the concrete structure, and these methods. It is providing the anti-corrosion member which can be used.

1. Regarding Restructuring Method of Concrete Structure The method for restructuring a concrete structure according to the present invention is a method in which a cylindrical anticorrosive member formed by joining both ends of a flexible synthetic resin thin plate material is curved to form concrete. It is introduced into the internal space of the structure, and the anticorrosion member is restored to a cylindrical shape before deformation in the internal space, and the anticorrosion member is placed inside with a gap between the inner wall surface of the concrete structure and the back surface of the anticorrosion member. And a support member, filling a gap with a backfill material (adhesive), and integrally bonding the inner wall surface of the concrete structure and the anticorrosion member.

  As described above, according to the method for reconstructing a concrete structure according to the present invention, the inner wall surface of the concrete structure can be covered with the anticorrosion member. Therefore, even if hydrogen sulfide gas is generated in the internal space of the concrete structure, the inner wall surface can be protected from corrosion.

  Further, according to the method for restructuring a concrete structure according to the present invention, it can be performed with a simple method and a small-scale facility, and therefore, the reconstructing work can be performed quickly and inexpensively.

  Specifically, a cylindrical anticorrosion member formed by joining both ends of a flexible synthetic resin thin plate material is introduced into the internal space of the concrete structure, and the anticorrosion member is deformed in the internal space before the deformation. Since it is restored to a cylindrical shape, for example, the anticorrosion member can be introduced into a manhole having a structure with a narrow opening.

  Moreover, since the anticorrosion member is formed in a cylindrical shape by joining both ends of a flexible synthetic resin thin plate material, various diameter dimensions can be obtained by easily following the diameter dimensions of the concrete structure related to the construction. It is possible to quickly and inexpensively prepare the anticorrosion member having

  Moreover, since the anticorrosion member is an endless cylindrical shape restored in the internal space of the concrete structure, it is not necessary to perform a connection operation at a cutting point and a seam sealing operation. Therefore, the work can be performed efficiently and the reliability of the anticorrosion effect (corrosion resistance effect) can be ensured.

  Furthermore, since the anticorrosion member is cylindrical in a state of being restored in the internal space of the concrete structure, it can be made to stand on the inner bottom surface of the manhole, for example. Therefore, it is possible to easily perform the operation of introducing the support member into the internal space of the anticorrosion member and supporting and fixing the anticorrosion member by the support member.

2. About the manufacturing method of a concrete structure The technical idea of the rebuilding method of the concrete structure according to the present invention can be applied to the manufacturing method of the concrete structure based on the known corrosion problem of the concrete structure. That is, in the method for producing a concrete structure according to the present invention, a cylindrical anticorrosion member formed by joining both ends of a flexible synthetic resin thin plate material is attached to an inner mold apparatus, and the anticorrosion member is attached from the inside. It includes a step of supporting by the mold device, disposing the outer mold device at a distance from the back surface of the anticorrosion member, and placing a concrete material in a gap between the inner surface of the external mold device and the back surface of the anticorrosion member.

  According to the concrete structure manufacturing method described above, it is possible to manufacture a concrete structure in which the inner wall surface is covered with the anticorrosion member in advance.

3. About anticorrosion member The anticorrosion member which concerns on this invention contains a support part and a nonwoven fabric. The support portion is a thin plate that can be bent, and is mainly composed of fiber-reinforced plastic. One side of the nonwoven fabric is bitten into one side of the support part and bonded, and the other side is exposed on one side of the support part.

  As described above, in the anticorrosion member according to the present invention, since the support portion is mainly composed of fiber reinforced plastic, for example, an excellent anticorrosion effect (corrosion resistance effect) against the corrosive action caused by hydrogen sulfide gas. Have

  One of the greatest features of the above-described anticorrosion member is that it has a nonwoven fabric. That is, the nonwoven fabric has a porous structure in which fibers are overlapped and bonded in a three-dimensional direction, and one surface side bites into one surface of the support portion and is bonded. According to this structure, the bonding strength (structural integrity) between the nonwoven fabric and the support portion is ensured, and inconveniences such as peeling of the nonwoven fabric from the support portion do not occur.

  Moreover, since the other surface side of the nonwoven fabric is exposed on one surface of the support portion, the inside of the nonwoven fabric can be impregnated with a backing material (adhesive) such as mortar by the porous structure of the nonwoven fabric in this exposed portion. In addition, the porous structure of the nonwoven fabric provides an excellent anchor effect with respect to the impregnated backfill material.

  Moreover, since the nonwoven fabric is bitten and bonded on one surface of the support portion and the bonding strength between the nonwoven fabric and the support portion is ensured, the anchor effect of the nonwoven fabric on the backfilling material can be dramatically improved. it can.

  The anticorrosion member according to the present invention can be used for the concrete structure reconstructing method and the concrete structure manufacturing method according to the present invention, which have already been described. Therefore, it is possible to provide a concrete structure restructuring method and a concrete structure manufacturing method having all the advantages of the above-described anticorrosion member.

  Other objects, configurations and advantages of the present invention will be described in more detail with reference to the accompanying drawings. The accompanying drawings are merely examples.

As described above, according to the present invention, the following effects can be obtained.
(1) A method for rebuilding a concrete structure that can be quickly and inexpensively constructed, a method for manufacturing a concrete structure, a concrete structure manufactured by these methods, and a method for using these methods An anticorrosion member that can be provided can be provided.
(2) Reconstructing method of concrete structure having excellent anticorrosion effect (corrosion resistance effect), manufacturing method of concrete structure, concrete structure manufactured by these building methods, and used for these building methods The anticorrosion member which can be provided, the manufacturing method of an anticorrosion member, and a concrete structure can be provided.
(3) Reconstruction method of concrete structure capable of improving the structural integrity of the concrete structure and the anticorrosion member, method for producing concrete structure, and concrete structure produced by these construction methods And the anticorrosion member which can be used for these construction methods can be provided.

  FIG. 1 is a front sectional view showing a concrete structure according to an embodiment of the present invention with a part thereof omitted. The concrete structure shown in FIG. 1 includes an anticorrosion member 1, a base portion 4, a backfill material (adhesive material) 5, an inflow pipe 71, and an outflow pipe 72.

  The base body 4 is a so-called assembly-type existing manhole, and has an internal space 400 defined by an inner wall surface 40 in the basement of the ground line 6. Specifically, the base portion 4 includes an oblique wall block 41, a straight wall block 42, and a bottom block 43, each of which is mainly composed of a concrete material, and these are integrally stacked in the height direction T in the order described above. And configured.

  The inflow pipe 71 and the outflow pipe 72 are generally tubular bodies mainly composed of a concrete material, and are respectively disposed in communication with a flow path (invert) 430 disposed in the bottom block 43. The sewage 70 once flows into the internal space 400 through the inflow pipe 71, then flows down along the invert 430, and is discharged to the outflow pipe 72.

  The anticorrosion member 1 is mainly composed of a synthetic resin material having an anticorrosive effect. Examples of synthetic resin materials used include thermosetting resins such as unsaturated polyester (UP), vinyl ester resin (VE), epoxy resin (EP), and phenol resin (PF), polyethylene resin (PE), and polypropylene. Thermoplastic resins such as (PP) and polyamide resin (PA) can be used.

  The specific configuration of the anticorrosion member 1 will be described in more detail. The anticorrosion member 1 is formed by bending a flexible thin plate (sheet shape) into a cylindrical shape. The seam 101 at the edge of the anticorrosion member 1 is previously sealed in a hermetic (watertight) manner by so-called lap joining or lining joining.

  The flexibility of the anticorrosion member 1 may be derived from the material or may be derived from the shape. For example, the thickness dimension of the anticorrosion member 1 is preferably about 0.5 to 2.0 mm, and the flexibility is ensured mainly by its thin plate structure.

  The concrete structure shown in FIG. 1 preferably includes a plurality of anticorrosion members 1. The plurality of anticorrosion members 1 are continuous in the height direction T along the inner wall surface 40 with respect to the slant wall block 41, the straight wall block 42, and the bottom block 43 connected in the height direction T. It arrange | positions and coat | covers the inner wall surface 40 integrally.

  As shown in FIG. 1, this type of assembly-type manhole has an opening 410 with a diameter of about 600 mm and a straight wall block with a diameter of about 900 mm, and the inner space 400 is the most reduced in diameter at the opening 410. It becomes a shape. Therefore, the plurality of anticorrosion members 1 are divided into those covering at least the inner wall surface 40 of the inclined wall block 41 and those covering the inner wall surface 40 of the bottom block 43 from the straight wall block 42 in the height direction T. Adjacent seams 102 are preferably sealed (watertight) with a known sealant or the like.

  The backfilling material (adhesive material) 5 is, for example, mortar, and the corroded portions are removed from the opposing surface between the inner wall surface 40 of the base portion 4 and the back surface 11 of the anticorrosion member 1 and from the inner wall surface 40. The back and forth uneven portion 44 is filled, and the base portion 4 and the anticorrosion member 1 are integrally coupled.

  According to the structure of the concrete structure described with reference to FIG. 1, hydrogen sulfide gas is generated in the internal space 400 because the inner wall surface 40 of the base portion 4 mainly composed of a concrete material is covered with the anticorrosion member 1. Even so, the inner wall surface 40 can be protected from corrosion caused by the hydrogen sulfide gas.

  By the way, as shown in FIG. 1, this type of manhole usually has a diameter dimension of the opening 410 of the slant wall block 41 of about 600 mm, and the straight cylinder portion 42-43 from the straight wall block 42 to the bottom block 43. The diameter dimension is about 900 mm, and the internal space 400 has a shape that is most reduced in diameter at the opening 410. Therefore, even if the cylindrical anticorrosion member 1 is prepared in accordance with the diameter of the straight cylinder portion 42-43 in the reconstruction work of the existing manhole, the anticorrosion member 1 is introduced into the internal space 400 from the opening 410 as it is. I can't.

  About the problem mentioned above, this invention has one of the characteristics in the point which added the device about the structure for introduce | transducing the anticorrosion member 1 in the internal space 400. FIG. Hereinafter, the concrete structure described with reference to FIG. 1 will be further described from the viewpoint of the specific reconstruction method shown in FIGS. 2 to 10 are views showing a method for reconstructing a concrete structure according to an embodiment of the present invention. 2 to 10, the same components as those shown in FIG. 1 are denoted by the same reference numerals.

  First, in the step shown in FIG. 2, the corroded portion generated on the inner wall surface 40 of the base portion 4 is removed in advance by, for example, high-pressure water cleaning. The uneven portion 44 after removing the corroded portion generated on the inner wall surface 40 may be filled with a repair agent such as epoxy resin or mortar to reinforce.

  The process shown in FIGS. 3 and 4 is a process subsequent to the process shown in FIG. 2, and a flexible synthetic resin thin sheet (sheet) that can be bent is previously attached to the inner wall surface of the straight cylindrical portion 42-43. An anticorrosion member 1a formed in a straight cylinder shape (cylindrical shape) along the shape is prepared. The diameter of the anticorrosion member 1a is preferably set to be smaller than the diameter (about 900 mm) of the diameter of the straight tube portion 42-43. In the anticorrosion member 1a, the edge seam 101 generated when the thin plate is formed into a cylindrical shape is hermetically (watertight) joined by so-called lap joining or lining joining.

  As shown in FIG. 4, by deforming the straight cylindrical anticorrosive member 1a into a concave shape along the axial direction indicated by the arrow a1, the shape of the opening 410 indicated by the alternate long and short dash line, and the radial dimension, The diameter is reduced to a shape that allows passage and a diameter.

  The process shown in FIG. 5 is a process after the process shown in FIGS. 3 and 4, and the anticorrosive member 1 a having a reduced diameter is introduced into the internal space 400 from the opening 410. Although not illustrated, the anticorrosive member 1a having a reduced diameter passes through the opening 410, is introduced into the internal space 400, and is then restored (expanded) into a straight cylinder shape before deformation, so that the inner bottom surface of the bottom block 43 Standing on top.

  The process shown in FIG. 6 is a process subsequent to the process shown in FIG. 5, and a flexible synthetic resin thin plate (sheet) that can be bent is preliminarily formed along the inner wall surface shape of the inclined wall block 41. An anticorrosion member 1 b formed in a slanted cylinder shape is prepared, and the anticorrosion member 1 b is reduced in diameter and introduced into the internal space 400 from the opening 410. After the anticorrosion member 1b is introduced into the internal space 400, it is stacked on the anticorrosion member 1a introduced earlier, and the seam 102 of the anticorrosion members 1a, 1b adjacent to each other in the height direction T is sealed (watertight) with a known sealing material or the like. ). Each of the anticorrosion members 1 a and 1 b is adjusted in diameter and shape in advance so that a gap g <b> 1 is generated between the opposite surfaces of the back surface 11 and the inner wall surface 40 of the base portion 4. .

  The process shown in FIG. 7 is a process after the process shown in FIG. 6, in which the support member 8 is introduced from the opening 410 and the support member 8 is erected in the cylindrical internal space of the anticorrosion members 1 a and 1 b. To do. The support member 8 preferably has an assembled structure that can be introduced from the opening 410, and has a surface shape that follows the shape of the surface 12 of the anticorrosion members 1a and 1b.

  The anticorrosion members 1 a and 1 b have the surface 12 fixed on the support member 8, and the support member 8 extends the twists, wrinkles and irregularities on the surface. A support device 80 is preferably disposed inside the support member 8 to prevent the anticorrosion members 1a and 1b and the support member 8 from being turned over.

  The process shown in FIG. 9 is a process after the process shown in FIGS. 7 and 8, and a mortar or the like is formed in the gap g1 between the back surface 11 of the anticorrosive members 1 a and 1 b and the inner wall surface 40 of the base portion 4. The back-filling material (adhesive material) 5 is filled. The backfill material 5 is filled in the uneven portion 44 after the corroded portion is removed from the gap g1 and the inner wall surface 40. The back-filling material 5 is cured through a curing period, thereby integrally bonding the base portion 4 and the anticorrosion member 1.

The process shown in FIG. 10 is a process after the process shown in FIG. 9, and preferably after the backfill material 5 is completely cured, the support member 8 erected inside the anticorrosion members 1 a and 1 b, and Then, the support device 80 is disassembled and carried out from the opening 410. According to the method for reconstructing a concrete structure described with reference to FIGS. 2 to 10, since it can be executed with a simple method and a small-scale facility, it can be constructed quickly and inexpensively.

  Specifically, the anticorrosive members 1a and 1b that are preliminarily formed into a cylindrical shape are curved and deformed (reduced diameter) in accordance with the diameter of the opening 410 and introduced into the internal space 400. Since 1b is restored (expanded) into a cylindrical shape before deformation, for example, the anticorrosion members 1a and 1b can be introduced into a manhole having a narrow opening 410.

  Moreover, since each of the anticorrosion members 1a and 1b is an endless cylindrical shape in which the seam 101 is joined in advance in a watertight manner in a state of being restored in the internal space 400, connection work for the seam 101 is unnecessary. Therefore, the assembly man-hours of the anticorrosion members 1a and 1b can be reduced, thereby improving the construction efficiency.

  Furthermore, since each of the anticorrosion members 1a and 1b has an endless cylindrical shape in which the seam 101 is previously joined in a watertight manner, the sealing work of the seam 101 is not necessary. Therefore, the reliability of the anticorrosion effect (corrosion resistance effect) can be ensured.

  In addition, since each of the anticorrosion members 1 a and 1 b is an endless cylindrical shape restored in the internal space 400, for example, the anticorrosion members 1 a and 1 b can be self-supported on the inner bottom surface of the bottom block 43. Accordingly, the support member 8 is introduced into the anticorrosion members 1a and 1b, and the work of supporting and fixing the anticorrosion members 1a and 1b by the support member 8 can be easily performed.

  The anticorrosion members 1a and 1b are formed in a cylindrical shape by joining both ends of a flexible synthetic resin thin plate (sheet) that can be bent. Therefore, the anticorrosion members 1a and 1b having various diameters can be prepared quickly and inexpensively by easily following the diameter of the concrete structure to be constructed.

  Moreover, according to the process which joins the both ends of a synthetic resin thin plate (sheet | seat), shape | molds in a cylindrical shape, and comprises the anticorrosion member 1a, 1b, the manufacturing process of a synthetic resin thin plate is performed using the existing equipment. The manufacturing cost can be reduced because of high productivity.

  Furthermore, since the anticorrosion members 1a and 1b are flexible and can be deformed, they can be transported quickly and in large quantities without being bulky.

  The concrete structure reconstructing method described with reference to FIGS. 1 to 10 can be applied to a newly manufactured concrete structure based on the well-known corrosion problem of concrete structures. FIG. 11 is a plan view showing a part of a concrete structure according to another embodiment of the present invention, and FIG. 12 is a front view showing a part of the concrete structure shown in FIG. . 11 and 12, the same reference numerals are given to the same components as those shown in FIGS. 1 to 10.

  The concrete structure shown in FIGS. 11 and 12 is a so-called assembly-type existing manhole straight wall block (see FIGS. 1 to 10), and includes the anticorrosion member 1 and the base portion 4.

  The anticorrosive member 1 is a thin plate shape (sheet shape) having flexibility that can be bent, and is formed into a cylindrical shape, and includes a synthetic resin material having an anticorrosive effect as a main component. Examples of synthetic resin materials used include thermosetting resins such as unsaturated polyester (UP), vinyl ester resin (VE), epoxy resin (EP), and phenol resin (PF), polyethylene resin (PE), and polypropylene. Thermoplastic resins such as (PP) and polyamide resin (PA) can be used.

  The base body 4 is an example of a straight wall block of an assembly-type manhole (see FIGS. 8 to 14), and has an internal space 400 partitioned by an inner wall surface 40.

  In the concrete structure shown in FIGS. 11 and 12, the anticorrosion member 1 is directly disposed on the inner wall surface 40 and integrally covers the inner wall surface 40. This structure can have all the advantages of the concrete structure described with reference to FIG.

  The present invention has one of the features in that the device for arranging the anticorrosion member 1 on the inner wall surface 40 is devised. Hereinafter, the concrete structure described with reference to FIGS. 11 and 12 will be further described from the viewpoint of the specific manufacturing method illustrated in FIGS. 13 to 17. 13 to 17 are views showing a method for manufacturing a concrete structure according to another embodiment of the present invention. 13 to FIG. 17, the same reference numerals are given to the same components as those shown in FIG. 1 to FIG.

  First, the anticorrosion member 1 which prepared the thin plate shape (sheet shape) which has the flexibility which can be bent in the cylinder shape is prepared. The diameter of the anticorrosion member 1 formed into a cylindrical shape is preferably set in advance to be smaller than the diameter of the inner mold device 81 (about 900 mm). The seam 101 at the edge of the anticorrosion member 1 is joined in a watertight manner by so-called lap joining or backing joining. Further, in the process shown in FIGS. 13 and 14, the tubular anticorrosion member 1 is disposed on the winding surface 810 of the inner mold device 81. The inner mold device 81 is preferably a molding facility used in an existing concrete molding facility, and a release agent is applied to the winding surface 810 in order to facilitate subsequent demolding operations. . In addition, sand particles 9 or gravel 9 having a large particle size is usually sprayed on the outer peripheral surface of the anticorrosion member 1 in order to enhance the adhesion to the raw concrete material.

  The process shown in FIG. 15 is a process after the process shown in FIGS. 13 and 14, in which the outer mold device 82 is arranged at a distance g 2 from the outer surface of the anticorrosion member 1, and the inner wall surface of the outer mold device 82 is The ready-mixed concrete material 4 is placed at a distance g <b> 2 between 820 and the back surface 11 of the anticorrosion member 1. The interval g2 is appropriately adjusted according to the thickness of the final molded product. As the outer mold device 82, one used in an existing concrete molding facility can be used. The outer mold device 82 has a structure that can be divided into a plurality of parts, and a release agent is applied to the inner wall surface 820 in order to facilitate the subsequent demolding operation.

  The process shown in FIG. 16 is a process subsequent to the process shown in FIG. 15, and the ready-mixed concrete material 4 placed at the interval g <b> 2 is molded into the base portion 4 through a predetermined curing period, and the anticorrosion member 1. And are integrally coupled.

  The process shown in FIG. 17 is a process after the process shown in FIG. 16, and after molding the base portion 4, the inner mold device 81 is removed in the direction indicated by the arrow m <b> 3, and the outer mold device 82 is moved to the arrow m <b> 4. Separating in the direction indicated by, and demolding the concrete structure.

  According to the method of manufacturing a concrete structure described with reference to FIGS. 13 to 17, it is possible to provide a concrete structure having all the advantages described with reference to FIGS. 1 to 13 in advance. For example, since the inner wall surface 40 of the base portion 4 mainly composed of a concrete material is covered with the anticorrosion member 1, the inner wall surface 40 can be protected from corrosion.

  By the way, in the concrete structure described with reference to FIGS. 1 to 17 and the method for reconstructing the concrete structure, the gap g1 between the back surface 11 of the anticorrosive member 1 and the inner wall surface 40 of the base portion 4 is filled. When the backfilling material 5 is, for example, a synthetic resin adhesive, the backfilling material 5 and the backfilling material 5 are fixed by the difference in material between the backfilling material 5 and the base portion 4. It has been confirmed that the anticorrosion member 1 is easily peeled from the inner wall surface 40.

  On the other hand, when the backfilling material 5 is cement mortar, the anticorrosion member 1 is peeled from the backfilling material 5 due to the difference in material between the backfilling material 5 and the anticorrosion member 1 mainly composed of synthetic resin. It has been confirmed that it is easy.

  In this respect, as a technique for ensuring the structural integrity of the anticorrosion member 1 and the inner wall surface 40, conventionally, measures such as providing an anchor protrusion on the back surface 11 of the anticorrosion member 1 have been taken. However, in order to form a large number of such anchor protrusions on the back surface 11 of the anticorrosion member 1, excessive equipment investment such as the need for a new mold is required, resulting in high costs.

  In order to solve the above-described problems, the present invention is a corrosion-proof member that can ensure structural integrity with the inner wall surface 40 and can be manufactured quickly and inexpensively. An anticorrosion member that can be used in a method for restructuring / manufacturing a structure is provided. Hereinafter, the anticorrosion member according to the present invention will be described.

  18 is a partial plan view of the anticorrosion member according to one embodiment of the present invention, FIG. 19 is a partial side view of the anticorrosion member 1 shown in FIG. 18, and FIG. 20 is the anticorrosion member 1 shown in FIGS. It is sectional drawing which expands and shows a part of. 18 to 20, the anticorrosion member 1 according to an embodiment of the present invention includes a support portion 10 and a nonwoven fabric 20.

  The support portion 10 is a thin plate shape (sheet shape) having a flexibility that can be bent, and has one surface 13 and another surface 14. The thickness d10 of the support part 10 is preferably about 0.5 to 2.0 mm.

  Specifically, the support 10 is mainly composed of fiber reinforced plastics (FRP = Fiber Reinforced Plastics). In this specification, the fiber reinforced plastic refers to a mixture of a reinforcing fiber aggregate in a plastic material as a base material.

  In general, a thermosetting resin is often used as a plastic material as a base material. For example, examples of the thermosetting resin used in FRP include unsaturated polyester (UP), vinyl ester resin (VE), epoxy resin (EP), and phenol resin (PF). On the other hand, there are fiber reinforced thermoplastics (FRTP) using thermoplastic resins such as polyethylene resin (PE), polypropylene (PP), and polyamide resin (PA) as a base material.

  Furthermore, for FRP, G-FRP (using glass fiber), C-FRP (using carbon fiber), A-FRP (using aramid fiber) depending on the type of fiber aggregate mixed with the base material and so on.

  The support portion 10 of the anticorrosion member 1 shown in FIGS. 18 to 20 can be mainly composed of fiber reinforced plastic (FRP) according to any of the configurations described above.

  The non-woven fabric 20 shown in FIGS. 18 to 20 is a cotton-like non-woven fabric having one surface 21 and the other surface 22, and is composed of a porous structure in which fibers are overlapped and bonded in a three-dimensional direction. The interior of the dimension d20 has a space that can be impregnated with a backfilling material (adhesive) 5 such as mortar. Specifically, the thickness dimension d20 of the nonwoven fabric 20 is preferably about 0.5 to 3.0 mm, more preferably about 0.5 to 1.5 mm.

  In the nonwoven fabric 20, the one surface 21 side partially bites into and joins the one surface 13 of the support portion 10, and the other surface 22 side is partially exposed on the one surface 13 of the support portion 10. The connecting structure between the support portion 10 and the nonwoven fabric 20 will be described in more detail. The support portion 10 and the nonwoven fabric are arranged at the opposite portions of the one surface 13 of the support portion 10 and the one surface 21 of the nonwoven fabric 20 facing the one surface 13. 20, there is an embedded portion 201 that bites into each other, and the supporting portion 10 and the nonwoven fabric 20 are integrally connected by the embedded portion 201. On the other hand, in the nonwoven fabric 20, the exposed portion 202 other than the embedded portion 201 is disposed on the one surface 13 of the support portion 10 in the thickness dimension d20 (see FIG. 3).

  In the anticorrosion member 1 described with reference to FIGS. 18 to 20, since the support portion 10 is mainly composed of fiber reinforced plastic, for example, an excellent anticorrosion effect against the corrosive action caused by hydrogen sulfide gas ( Corrosion resistance).

  Moreover, since the support part 10 which comprises the anticorrosion member 1 and the anticorrosion member 1 is a thin plate shape (sheet shape), and is a shape rich in mass-productivity, it can reduce manufacturing cost.

  Furthermore, since the anticorrosion member 1 and the support part 10 which comprises the anticorrosion member 1 are thin plate shape (sheet shape), they can be transported quickly and in large quantities without being bulky.

  One of the features of the anticorrosion member 1 described with reference to FIGS. 18 to 20 is that it has a nonwoven fabric 20. The nonwoven fabric 20 has a porous structure in which fibers are overlapped and bonded in a three-dimensional direction, and has a space in which an adhesive such as mortar can be impregnated (exposed portion 202). According to this structure, the exposed portion 202 can be impregnated with an adhesive such as mortar, and the porous structure of the nonwoven fabric 20 can exhibit an excellent anchor effect with respect to the impregnated adhesive.

  Here, the thickness d20 of the nonwoven fabric 20 is preferably about 0.5 to 3.0 mm, and more preferably about 0.5 to 1.5 mm. If the thickness d20 of the nonwoven fabric 20 is thinner than 0.5 mm, the amount of the adhesive impregnated into the exposed portion 202 is insufficient, and the anchor effect cannot be sufficiently ensured.

  On the other hand, when the thickness dimension d20 of the nonwoven fabric 20 is greater than 3.0 mm, it becomes difficult to sufficiently impregnate the exposed portion 202 of the nonwoven fabric 20 with the adhesive. As a result, a region where the adhesive is not impregnated (non-impregnated region) easily occurs in the exposed portion 202, and when external pressure is applied to the nonwoven fabric 20, A problem arises in the reliability of the anchor effect of the nonwoven fabric 20 such as a breakage accident.

  Moreover, when using the mortar as an adhesive, when the thickness dimension d20 of the nonwoven fabric 20 becomes thicker than 3.0 mm, it is confirmed that the mortar is filtered (separated) into the cement component and moisture on the surface of the exposed portion 202. Therefore, a problem arises in the reliability of the anchor effect of the nonwoven fabric 20.

  Since the nonwoven fabric 20 has the one surface 21 side bite into and bonded to the one surface 13 of the support portion 10, the bonding strength between the nonwoven fabric 20 and the support portion 10 is improved. Therefore, inconveniences such as peeling of the nonwoven fabric 20 from the support portion 10 do not occur, and the anchor effect of the nonwoven fabric 20 can be dramatically improved.

  The connection structure between the support portion 10 of the anticorrosion member 1 and the nonwoven fabric 20 described with reference to FIGS. 18 to 20 will be further described from the viewpoint of the manufacturing method shown in FIG. FIG. 21 is a diagram showing an embodiment of a method for producing the anticorrosion member 1 according to the present invention. In FIG. 21, the same components as those shown in FIGS. 1 to 20 are denoted by the same reference numerals.

  The manufacturing method shown in FIG. 21 shows the continuous molding process of the anticorrosion member 1 shown in FIGS. 18 to 20, and includes a support film 30, a first supply device 31, a transport roller 32, and a second supply. It has the apparatus 33, the press roller 34, the hardening process part 35, and the winding apparatus 36. FIG. Hereinafter, for convenience of explanation, an example in which a thermosetting resin is used as the base material of the fiber reinforced plastic constituting the support portion 10 will be described.

  The 1st supply apparatus 31 has an application part. The coating unit includes, for example, a coating nozzle (not shown) having an opening width that is the same as the width of the support film 30 and is in an uncured state (pasted) supplied from an external storage tank (not shown). A thermosetting resin is continuously applied on the support film 30. Since the support film 30 is sent in the transport direction indicated by the arrow m1 by the transport roller 32, an uncured thermosetting resin as a base material is applied and formed in a sheet form on the support film 30. The Hereinafter, the uncured thermosetting resin formed in a sheet shape is referred to as a thermosetting resin green sheet 10a.

  The 2nd supply apparatus 33 mixes a fiber aggregate in the thermosetting resin green sheet 10a. Specifically, when the fiber aggregate is powdery (fibrous), the second supply device 33 continuously attaches the fiber aggregate supplied from the external storage tank to the thermosetting resin green sheet 10a. And mix. On the other hand, when the fiber aggregate is in a sheet form, the second supply device 33 places the fiber aggregate sheet supplied from the outside on the thermosetting resin green sheet 10a and mixes it. By the second supply device 33, the fiber aggregate is mixed with the thermosetting resin green sheet 10a, and the uncured FRP thin plate material 10b is formed.

  The uncured FRP thin plate material 10b is formed on the support film 30, and is further fed together with the support film 30 by the transport roller 32 in the transport direction m1. And the nonwoven fabric 20 is mounted with respect to this unhardened FRP sheet material 10b. The nonwoven fabric 20 is conveyed from a supply device (not shown) in the conveyance direction m2 indicated by an arrow by a conveyance roller 32, and preferably the nonwoven fabric 20 is placed on one surface of the uncured FRP thin plate material 10b by a pressure roller 34. The One side 21 of the nonwoven fabric 20 is bitten into one side of the uncured FRP thin plate material 10b in contact therewith. In addition, the penetration distance (embedding depth dimension) of the nonwoven fabric 20 with respect to the support part 10 can be adjusted by setting the arrangement of the pressure roller 34 and the pressing force in advance.

  The uncured FRP thin plate material 10c placed with the nonwoven fabric 20 biting into one surface is further transported in the transport direction m1 by the transport roller 32 and sent to the curing processing unit 35. When the thermosetting resin is specifically used as the base material of the fiber reinforced plastic, the curing processing unit 35 is an apparatus that mainly performs a heating process and further a crimping process, and the nonwoven fabric 20 bites into one surface. The uncured FRP thin plate material 10c placed in step 1c is subjected to a heat treatment and a pressure-bonding treatment so that both are cured in a combined state. The uncured FRP thin plate material 10c is formed on the support unit 10 by the curing processing unit 35, and the anticorrosion member 1 described with reference to FIGS. 1 to 3 is obtained.

  The anticorrosion member 1 formed by the curing process is further subjected to a cooling process (not shown), wound by the winding device 36, and stored through a cutting process (not shown). And according to concrete construction conditions, it cuts into a desired shape and is used.

  According to the manufacturing method described with reference to FIG. 21, the anticorrosion member 1 having all the advantages described with reference to FIGS. 18 to 21 can be manufactured at low cost. For example, the anticorrosion member 1 which concerns on this invention can be manufactured by adding the process of attaching the nonwoven fabric 20 with respect to the existing FRP shaping | molding apparatus. That is, since it is not necessary to prepare a new mold, excessive capital investment is not imposed, and the manufacturing cost can be reduced.

  Furthermore, since this kind of nonwoven fabric 20 is easy to manufacture or obtain, the manufacturing cost of the anticorrosion member 1 can be reduced.

  The anticorrosion member 1 described with reference to FIGS. 18 to 21 is formed into a cylindrical shape, whereby the anticorrosion member 1 of the concrete structure reconstructing / manufacturing method described with reference to FIGS. Can be used as 22 is a front sectional view showing a concrete structure according to another embodiment of the present invention with a part omitted, FIG. 23 is a partial sectional view taken along line 23-23 of FIG. 22, and FIG. It is a figure which expands and shows a part of concrete structure shown in FIG.

  When the concrete structure (existing manhole) shown in FIGS. 22 to 24 is compared with the concrete structure (existing manhole) described with reference to FIG. 1, they are different in the internal configuration of the anticorrosion member 1. have. Hereinafter, the internal configuration of the anticorrosion member 1 will be mainly described.

  The concrete structure (existing manhole) shown in FIGS. 22 to 24 includes the anticorrosion member 1 described with reference to FIGS. 18 to 21, the base portion 4, and the backfill material (adhesive) 5.

  The base body 4 is a so-called assembly-type manhole, and has an internal space 400 partitioned by an inner wall surface 40. The anticorrosion member 1 is disposed along the inner wall surface 40 and covers the inner wall surface 40. The backfill material 5 is, for example, mortar, and removes corroded portions from the inner peripheral surface 41 between the opposing surfaces (gap g1) between the inner peripheral surface 41 of the base portion 4 and one surface of the anticorrosion member 1. Then, the uneven portion 42 is filled and impregnated inside the nonwoven fabric 20 (exposed portion 202).

  According to the manhole structure described with reference to FIGS. 22 to 24, all the advantages of the anticorrosion member 1 described with reference to FIGS. 18 to 21 can be obtained. For example, the anticorrosion member 1 has the support portion 10 mainly composed of fiber reinforced plastic disposed on the inner space 400 side, so that the inner space 400 is also disposed after the anticorrosion member 1 is disposed on the inner peripheral surface 41. Therefore, it has an excellent anticorrosive effect (corrosion resistance) against the hydrogen sulfide gas generated continuously, and can protect the inner peripheral surface 41 from corrosion.

  In reconstructing a concrete structure, when the inner peripheral surface 41 is covered with the anticorrosive member 1, cement mortar is widely used as the backfill material 5 for the connection between the two. Since the conventional anticorrosion member is composed of only a synthetic resin material (or FRP), there is room for improvement in that the anticorrosion member easily peels off from the cement mortar due to the difference in material between the cement mortar and the anticorrosion member. It was.

  On the other hand, the anticorrosion member 1 according to the present invention has a nonwoven fabric 20, and the nonwoven fabric 20 has a porous structure in which fibers are overlapped and bonded in a three-dimensional direction, and the other surface 22 side is one surface of the support portion 10. Since the exposed portion 202 is exposed above, the porous structure of the nonwoven fabric 20 exhibits an excellent anchoring effect on the backfill material 5 by impregnating the backfill material 5 such as mortar into the exposed portion 202. Therefore, the joint strength (structural integrity) between the inner peripheral surface 41 and the anticorrosion member 1 can be improved.

  Since the anticorrosion member 1 is a thin plate that can be bent, the anticorrosion member 1 can be easily arranged following the scale of the manhole and the shape of the inner peripheral surface 41 to cover the inner peripheral surface 41.

  In the production of a concrete structure, when the inner peripheral surface 41 is covered with the anticorrosive member 1, the nonwoven fabric 20 is directly applied to the inner peripheral surface 41 of the base portion 4 by impregnating the exposed portion 202 with the raw concrete material. Buried. That is, the non-woven fabric 20 is bonded in a state in which the one surface 21 partially bites into the inner peripheral surface 41. Also with this structure, all the advantages of the anticorrosion member 1 described with reference to FIGS. 18 to 21 and the concrete structure using the same can be obtained.

  Moreover, although the concrete structure shown in FIGS. 22-24 is what is called a manhole, this is only an illustration. The concrete structure using the anticorrosion member 1 according to the present invention includes all concrete structures such as drain pipes and further manholes that cause deterioration such as corrosion on the surface depending on the use environment, in addition to manholes. FIG.25 and FIG.26 is front sectional drawing which abbreviate | omits and shows the concrete structure which concerns on another embodiment of this invention.

  The concrete structure shown in FIG. 25 is a so-called drain pipe, and has a through space partitioned by an inner peripheral surface 41 of a concrete pipe body.

  The support portion 10 of the anticorrosion member 1 is curved in a cylindrical shape following the inner peripheral surface 41 of the drain pipe, and the nonwoven fabric 20 is joined by the one surface 21 side biting into the one surface 11 of the support portion 10. The side of the other surface 22 is exposed on the one surface 11 of the support portion 10. The anticorrosion member 1 is disposed inside the base portion 4 and covers the inner peripheral surface 41. The back-filling material 5 is, for example, mortar, and the unevenness after removing the corroded portion between the inner peripheral surface 41 of the base portion 4 and one surface of the anticorrosion member 1 and the inner peripheral surface 41. The portion 42 is filled and impregnated inside the nonwoven fabric 20 (see FIG. 24).

  Even with the structure of the concrete structure described with reference to FIG. 25, all the advantages of the anticorrosion member 1 described with reference to FIGS. 18 to 24 and the concrete structure using the same can be obtained. For example, one of the features of the anticorrosion member 1 according to the present invention is that the one surface 21 side of the nonwoven fabric 20 is bitten into the one surface 11 of the support portion 10 and the other surface 22 side is on the one surface 11 of the support portion 10. Due to the exposed structure (exposed portion 202), the porous structure of the nonwoven fabric 20 has an excellent anchor effect with respect to the backfill material 5 impregnated in the exposed portion 202. Therefore, the shape of the support portion 10 that becomes the base of the nonwoven fabric 20 can be set following the specific shape of the base portion 4.

  Moreover, since the support portion 10 is a thin plate having flexibility that can be bent, it is possible to easily follow the inner diameter dimension of the drain pipe and the inner diameter surface shape, and to form the base portion 4. It can follow the shape.

  Furthermore, since the support portion 10 is a thin plate having flexibility that can be bent, in addition to the tubular body having a circular cross section as shown in FIG. 7, various shapes follow the shape of the base portion 4. Can be taken. In addition, since the nonwoven fabric 20 has a porous structure, the nonwoven fabric 20 can easily follow up without inhibiting the change in the shape of the support portion 10.

  The concrete structure shown in FIG. 26 is a so-called purification tank, and includes the anticorrosion member 1 described with reference to FIGS. 18 to 24, the base portion 4, and the backfill material (adhesive material) 5. .

  The base body 4 is a water tank for purifying the sewage 70 collected through the inflow pipe 71, and is an internal space mainly composed of a concrete material and partitioned by the inner peripheral surface 41 below the ground line 6. (Purification processing space) 40 is provided. After the purification process, the sewage 70 is sent to the next purification process stage through the outflow pipe 72.

  The purification treatment tank includes a plurality of anticorrosion members 1. Each of the anticorrosion members 1 has been described with reference to FIGS. 18 to 21, and a plurality of the anticorrosion members 1 are continuously arranged along the inner peripheral surface 41 to cover the inner peripheral surface 41.

  The backfill material 5 is, for example, mortar, and removes corroded portions from the inner peripheral surface 41 between the opposing surfaces (gap g1) between the inner peripheral surface 41 of the base portion 4 and one surface of the anticorrosion member 1. Then, the uneven portion 42 is filled and impregnated inside the nonwoven fabric 20 (exposed portion 202).

  The structure of the concrete structure described with reference to FIG. 26 can have all the advantages of the anticorrosion member 1 described with reference to FIGS. 18 to 24 and the concrete structure using the same.

  Although the contents of the present invention have been specifically described above with reference to the preferred embodiments, it is obvious that those skilled in the art can take various modifications based on the basic technical idea and teachings of the present invention. It is.

It is front sectional drawing which abbreviate | omits and shows a concrete structure concerning one Embodiment of this invention. It is a figure which shows the reconstruction method of the concrete structure which concerns on one Embodiment of this invention. FIG. 3 is a perspective view showing a step after the step shown in FIG. 2. FIG. 4 is a plan view of the process shown in FIG. 3. It is a figure which shows the process after the process shown in FIG.3 and FIG.4. FIG. 6 is a diagram showing a step after the step shown in FIG. 5. It is a figure which shows the process after the process shown in FIG. It is a fragmentary sectional view in alignment with line 8-8 in FIG. FIG. 9 is a diagram showing a step after the step shown in FIGS. 7 and 8. FIG. 10 is a diagram showing a step after the step shown in FIG. 9. It is a top view which fractures | ruptures and shows a part of concrete structure which concerns on another embodiment of this invention. It is a front view which fractures | ruptures and shows a part of concrete structure shown in FIG. It is a figure which shows the manufacturing method of the concrete structure which concerns on another embodiment of this invention. It is a front view which fractures | ruptures and shows a part of process shown in FIG. FIG. 15 is a diagram showing a step after the step shown in FIGS. 13 and 14. FIG. 16 is a diagram showing a step after the step shown in FIG. 15. FIG. 17 is a diagram showing a step after the step shown in FIG. 16. It is a partial top view of the anticorrosion member which concerns on one Embodiment of this invention. It is a partial side view of the anticorrosion member shown in FIG. It is sectional drawing which expands and shows a part of anticorrosion member shown in FIG.18 and FIG.19. It is a figure which shows one Embodiment of the manufacturing method of the anticorrosion member which concerns on this invention. It is front sectional drawing which abbreviate | omits one part and shows about the concrete structure which concerns on another embodiment of this invention. It is a fragmentary sectional view in alignment with line 23-23 in FIG. It is a figure which expands and shows a part of concrete structure shown in FIG.22 and FIG.23. It is front sectional drawing which abbreviate | omits one part and shows about the concrete structure which concerns on another embodiment of this invention. It is front sectional drawing which abbreviate | omits one part and shows about the concrete structure which concerns on another embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a, 1b Corrosion prevention member 10 Support part 11 Back surface 4 Base | substrate part 40 Inner wall surface 400 Internal space 5 Backing material 8 Support member 81 Inner mold apparatus 82 Outer mold apparatus

Claims (6)

Curved cylindrical anticorrosion member formed by joining both ends of a flexible synthetic resin sheet material, introduced into the interior space of the concrete structure,
In the internal space, the anticorrosion member is restored to a cylindrical shape before deformation,
In a state having a gap between the inner wall surface of the concrete structure and the back surface of the anticorrosion member, the anticorrosion member is supported by the support member from the inside,
Filling the gap with a backfilling material, and integrally bonding the inner wall surface of the concrete structure and the anticorrosion member;
Reconstruction method for concrete structures. The method for reconstructing a concrete structure according to claim 1, wherein the anticorrosion member further includes a support portion and a nonwoven fabric,
The support portion is a flexible thin plate that can be bent, and has a fiber reinforced plastic as a main component,
The one side of the nonwoven fabric is bitten into one side of the support part, and the other side is exposed on one side of the support part.
A method for reconstructing a concrete structure using the anticorrosion member. A cylindrical anticorrosion member formed by joining both ends of a flexible synthetic resin sheet material is attached to the inner mold device, and the anticorrosion member is supported from the inside by the inner mold device,
An outer mold device is arranged at a distance from the back surface of the anticorrosion member,
The manufacturing method of a concrete structure including the process of placing concrete material in the clearance gap between the inner surface of the said external type | mold apparatus, and the back surface of the said anticorrosion member. The method for producing a concrete structure according to claim 3, wherein the anticorrosion member further includes a support portion and a nonwoven fabric,
The support portion is a flexible thin plate that can be bent, and has a fiber reinforced plastic as a main component,
The one side of the nonwoven fabric is bitten into one side of the support part, and the other side is exposed on one side of the support part.
A method for producing a concrete structure using the anticorrosion member. An anticorrosion member comprising a support and a nonwoven fabric,
The support portion is a flexible thin plate that can be bent, and has a fiber reinforced plastic as a main component,
The non-woven fabric is an anticorrosion member in which one surface side is bitten into one surface of the support portion and the other surface side is exposed on one surface of the support portion. A concrete structure including an anticorrosive member and a base portion,
The anticorrosion member is the one described in claim 5,
The said base | substrate part has the internal space divided by the inner wall face, The said inner wall face is a concrete structure covered with the said anticorrosion member.

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