JP4814355B2 - Concrete surface repair structure - Google Patents

Description

  The present invention relates to a simple and emergency concrete surface repair structure that is applied until a permanent concrete flaking prevention work is performed on a damaged concrete structure.

  Existing reinforced concrete structures (hereinafter referred to as “concrete structures”) are exposed to seawater, air, and various salt-containing media such as antifreeze agents depending on the construction environment. When such salinity penetrates from the concrete surface to the deep part (inside), the reinforcing bar of the concrete structure is corroded, and the concrete structure (cover concrete) on the surface layer is damaged, such as floating and peeling. End up. Similar damage is also caused by neutralization of concrete structures. For this reason, a permanent repair method for repairing a defective portion including the damaged portion is required for a concrete structure in which such damage such as floating or peeling occurs.

  For example, in the permanent flaking prevention method, the concrete part that has deteriorated due to the presence of salt and the like is removed, and the removed part is subjected to cross-sectional repair work, and then a primer is applied to the surface of the cross-sectional repair part. After applying and drying, a primer layer is formed, and an adhesive is applied on the primer layer to form an undercoat adhesive layer, and then a fiber sheet is immediately laminated and pasted on the uncured undercoat adhesive layer. In some cases, an adhesive is immediately applied to form a top adhesive layer, and after the base adhesive layer and the top adhesive layer are cured, a coating agent such as a fluororesin paint is applied to form a finish layer.

JP 2001-355343 A

Maeda Kousen Co., Ltd. Maintenance Sales Department, “Monthly Maeda July 2006 Issue”, [online], July 2006, Maeda Kousen Co., Ltd., p.2, [Search April 1, 2009], Internet (URL: http://www.maedakosen.jp/monthly/pdf/mdk0607.pdf)

  However, in the permanent flaking prevention countermeasure method described above, it is necessary to remove the deteriorated concrete part of the concrete structure and perform a cross-section repair work. In addition to the increase in construction cost, the construction period is relatively long. Furthermore, since it is necessary to sequentially form a primer layer, an undercoat adhesive layer, a fiber sheet, an overcoat adhesive layer, and a finish layer on the surface of the cross-section repaired part, the construction work tends to be complicated. There was a point.

  In addition, the permanent stripping prevention construction method described above performs cross-section repair work in advance when laying the fiber sheet to prevent concrete from stripping, so the construction scale may be increased accordingly. It takes a long time to formulate. For this reason, even if a damaged part is found in a concrete structure, a construction plan cannot be established immediately and the damaged part cannot be repaired in a short period of time. Therefore, such a damaged part may be left for several years. As a result, there was a problem that the damaged part was enlarged and the stripped concrete piece was dropped on the ground.

  Therefore, the present invention has been made to solve the above-described problems, and it peeled off from the concrete surface of a concrete structure during a predetermined repair life without using a peeling prevention measure by a cross-sectional repair method. An object of the present invention is to provide a simple and urgent concrete surface repair structure which can prevent a concrete piece from falling to the ground and can be constructed at a low cost and in a short period of time.

  In order to achieve this object, the concrete surface repair structure according to claim 1 is composed of a severely damaged portion where severe damage occurs on the concrete surface and a serious damage that is predicted to become a severely damaged portion within the repair life of the concrete surface. It is a repair structure for performing simple and emergency repairs to the predicted range, and is a flexible structure that is laid in the repair range including both the heavy damage portion and the heavy damage predicted range on the concrete surface and has many meshes A protective sheet that is formed into a reticulated network and can be seen through the concrete surface in a state where it is laid in the repair range, and a part of the protective sheet is placed on the concrete surface that is outside the heavy damage area and the heavy damage prediction range. An adhesive fixing member that is formed of an adhesive that adheres and fixes a part of the protective sheet to the concrete surface, and serious damage from the adhesive fixing member An adhesive that is provided at a position spaced apart on the side and adheres a part of the protective sheet to the concrete surface around the severely damaged portion and a part of the protective sheet that is adhered to the concrete surface by the adhesive are integrated. A local reinforcing member that is formed of a composite and locally reinforces the periphery of the severely damaged portion by the composite.

The concrete surface repair structure according to claim 2 is a concrete surface repair structure according to claim 1 , wherein the concrete surface repair structure is laid in a repair range including both a heavy damage portion and a heavy damage prediction range on the concrete surface in place of the protective sheet. The protective sheet is formed in a flexible sheet shape with holes formed therein.

  The concrete surface repair structure according to claim 3 is the concrete surface repair structure according to claim 1 or 2, wherein the local reinforcing member is on an extension line in a damage progress direction in which damage is expected to expand from a heavy damage portion of the concrete surface. It is provided so as to intersect.

The concrete surface repair structure according to claim 4 is the concrete surface repair structure according to any one of claims 1 to 3, wherein the local reinforcing member is provided in a belt shape around the entire periphery of the heavily damaged portion of the concrete surface. .

  The concrete surface repair structure according to a fifth aspect is the concrete surface repair structure according to any one of the first to fourth aspects, wherein the adhesive fixing member is formed in a belt shape at a peripheral edge portion of the protective sheet.

The concrete surface repair structure according to claim 6 is the concrete surface repair structure according to any one of claims 1 to 5, wherein a part of the protective sheet is placed outside the heavy damage portion and the heavy damage prediction range instead of the adhesive fixing member. In order to fix it to the concrete surface, there is a fixing holding means having a holding plate for sandwiching a protective sheet between the concrete surface and a fixing tool for fixing the holding plate to the concrete surface. The local reinforcing member is provided at a position away from the fixed holding means toward the heavily damaged portion.

  According to the concrete surface repair structure of the present invention, when a severe damage such as peeling or floating of the concrete occurs on the concrete surface, the severely damaged part that is the location of the serious damage on the concrete surface, and the repair on the concrete surface Simple and urgent repair is performed on the heavy damage prediction range, which is a range that is predicted to become a heavy damage portion within the service life.

  According to this repair structure, the repair range is set to a range including both the heavy damage portion and the heavy damage prediction range on the concrete surface, and the protective sheet is laid on the repair range. In other words, the protective sheet is placed on a severely damaged part that has already been severely damaged, and against the predicted serious damage range that is predicted to become a severely damaged part within the repair life of this repair structure. Is also put on.

  And since this protective sheet is partially bonded and fixed to the concrete surface to be repaired by the adhesive fixing member, if the concrete piece may be peeled off from the repair range after the construction by the repair structure, the peeled concrete piece The concrete piece can be prevented from falling to the ground.

  Moreover, the adhesive fixing member adheres a part of the protective sheet to the concrete surface with an adhesive, but the adhesive strength can be changed by adjusting the application amount, application area, etc. of the adhesive. The holding power of the protective sheet can be adjusted freely. Therefore, even when there is a place where a large amount of concrete pieces are expected to fall within the repair range, adjust the amount of adhesive applied, the area of application, etc. with sufficient holding power to withstand the weight of the concrete pieces. Can be secured easily.

  In addition, since the periphery of the heavily damaged portion on the concrete surface is locally reinforced by the local reinforcing member, for example, cracks on the concrete surface may expand from the heavily damaged portion to the outside. However, since such expansion progress is prevented by the local reinforcing member, the cracks are prevented from expanding further outward beyond the local reinforcing member.

  Furthermore, the local reinforcing member is formed of a composite in which a part of the protective sheet and an adhesive that adheres the protective sheet to the concrete surface are integrated, so that the local reinforcing member is stronger than the case of reinforcing using only the adhesive. Reinforcement can be applied.

  In addition, an adhesive is used for both the adhesive fixing member and the local reinforcing member. However, such an adhesive adheres a part of the protective sheet to the concrete surface, and the entire protective sheet covers the entire repair range of the concrete surface. As a result, the amount of adhesive used is minimized as compared with the case where the entire protective sheet is bonded to the entire repair range.

  If a material that can be cut with a cutting tool such as scissors is used as the material of the protective sheet, the protective sheet can be made according to the shape and size of the heavily damaged part of the concrete surface of the concrete structure to be constructed. The shape and dimensions can be adjusted by cutting.

  According to the concrete surface repair structure of claim 1, in particular, the protective sheet is formed of a net-like body having a large number of meshes, and the concrete surface is covered with the protective sheet in a state of being laid in the repair range of the concrete surface. Since it is possible to see through, the adhesive fixing member and the local reinforcing member are accurately placed over the protective sheet when the adhesive is applied to the concrete surface and the protective sheet is laid from there. In addition, it is possible to determine whether the amount of adhesive applied is excessive or insufficient through the protective sheet.

  Therefore, after the installation of the protective sheet, if there is insufficient application of adhesive at the location where the adhesive fixing member is installed or the location where the local reinforcing member is installed, the adhesive shortage location is passed through the protective sheet. It is also possible to apply additional adhesive through the mesh. Moreover, since the concrete surface can be seen through the protective sheet even after the protective sheet is laid, the progress of damage in the repair area can be observed even after the repair.

  In addition, since the protective sheet is a net-like body having a large number of meshes, the adhesive thread is passed through the large number of meshes, and the mesh yarn (mesh line) of the protective sheet is wrapped in the adhesive coating layer. Embedded in. For this reason, the protective sheet is not simply bonded to the adhesive surface, but is bonded to the concrete surface in a manner similar to that held by the adhesive.

  Therefore, in the adhesive fixing member, a sufficient holding force (supporting force) sufficient to support and support the weight of the stripped concrete piece is exhibited even if only a part of the protective sheet is adhesively fixed to the concrete surface with an adhesive. In addition, in the local reinforcing member, a composite body in which the mesh yarn of the protective sheet is literally embedded in a mesh shape is formed in the adhesive coating layer, and this composite increases the damage from the severely damaged part. Along with this, a sufficient load resistance against the expansion pressure (internal stress) is exhibited.

  According to the concrete surface repair structure of claim 2, in particular, the protective sheet is formed in a flexible sheet shape having a large number of holes, and the opening size of the large number of holes is relatively large. If it is laid in the repair range of the concrete surface, when applying the adhesive to the concrete surface and laying the protective sheet on it, the location and local reinforcement of the adhesive fixing member over the protective sheet The location of the member can be accurately grasped, and an excess or deficiency in the amount of adhesive applied can be determined through the protective sheet.

  Therefore, after the installation of the protective sheet, if there is insufficient application of adhesive at the location where the adhesive fixing member is installed or the location where the local reinforcing member is installed, the adhesive shortage location is passed through the protective sheet. It is also possible to apply additional adhesive through the mesh. Moreover, if the protective sheet can be seen through the concrete surface through the protective sheet even after laying, the progress of damage in the repair area can be observed even after the repair.

  In addition, since the protective sheet is formed in a flexible sheet shape having a large number of holes, uncured adhesive penetrates into the inside of the protective sheet and cures through the numerous holes of the protective sheet. Can do. For this reason, the protective sheet is not simply bonded to the adhesive surface, but is bonded to the concrete surface integrally with the adhesive impregnated therein.

  Therefore, in the adhesive fixing member, a sufficient holding force (supporting force) sufficient to support and support the weight of the stripped concrete piece is exhibited even if only a part of the protective sheet is adhesively fixed to the concrete surface with an adhesive. In addition, in the local reinforcing member, a composite body in which the adhesive coating layer and the protective sheet are integrated is formed, and this composite body is sufficient for the expansion pressure as the damage from the severely damaged part increases. The load-carrying capacity is demonstrated.

  According to the concrete surface repair structure of claim 3, the local reinforcing member is provided so as to cross the damage progress direction, particularly on the extension line of the damage progress direction in which the damage is expected to be expanded from the heavy damage portion on the concrete surface. Therefore, for example, it is possible to prevent the damage progressing from the severely damaged portion from further expanding beyond the local reinforcing member during the repair life. And since a local reinforcement member is provided on the extension line | wire of the damage progress direction where damage expansion is estimated, the construction of the local reinforcement member about the location where damage expansion is not estimated can also be abbreviate | omitted.

  According to the concrete surface repair structure of claim 4, in particular, the local reinforcing member is provided in a strip shape without leaving the entire periphery of the heavy damaged portion of the concrete surface. Even if it expands in the direction, it is possible to prevent further damage from expanding beyond the local reinforcing member.

  Moreover, since the local reinforcing member is strip-shaped, the adhesive that becomes a part of the local reinforcing member can be easily applied manually by using a spatula for application, and is applied manually to the entire repair range of the concrete surface. In contrast, the labor of the worker can be greatly reduced, and there is no need to bother using the machine equipment to reduce the labor of the worker.

  According to the concrete surface repair structure of claim 5, in particular, since the adhesive fixing member is formed in a band shape on the peripheral portion of the protective sheet, the adhesive which becomes a part of the adhesive fixing member is applied using a spatula for application. It can be applied easily by hand, and the labor of the worker can be greatly reduced compared to applying manually over the entire repair area of the concrete surface. There is no need to use and apply.

According to the concrete surface repair structure of the sixth aspect, except for matters relating to the adhesive fixing member, the same function as those of the first to fifth aspects and effects similar to those of the first to fifth aspects are exhibited.

According to the concrete surface repair structure of the present invention, a part of the protective sheet is fixed to the concrete surface that is the repair range by the adhesive fixing member or the fixing and holding means. Even if construction is not done immediately, it is urgent for a certain period within the repair life of this repair structure. There is an effect that it can prevent falling.

  For this reason, a severely damaged part was found in a concrete structure, but even if it was not possible to immediately formulate a permanent debonding countermeasure construction plan and repair it in a short period of time after the discovery of a severely damaged part In the period up to the construction of such permanent peeling prevention work, emergency and simple repairs can be performed, such heavy damaged parts are left as it is, and damage is expanded, and the stripped concrete pieces Has an effect of preventing falling to the ground.

  In addition, according to this repair structure, it is not necessary to perform a cross-section repair work for a severely damaged part like a permanent peeling prevention work, and accordingly, the construction cost required for the repair work can be reduced. The construction period can be shortened. Moreover, because it is an emergency and simple repair using protective sheets, adhesive fixing members and local reinforcement members, it is not necessary to formulate a detailed construction plan compared to permanent peeling prevention work, and damage to the concrete surface in the field There is also an effect that construction can be performed quickly and flexibly according to conditions.

It is explanatory drawing which showed the construction state of the peeling repair structure which is one Example of this invention, Comprising: (a) is a floor slab bottom view of the bridge upper structure in which the peeling repair structure was constructed, (b) These are the partially expanded views of (a). It is a longitudinal cross-sectional view of the peeling repair structure of Fig.1 (a). It is a floor slab bottom view of the bridge superstructure similar to the thing of Fig.1 (a), Comprising: The repair range before construction of a peeling repair structure is illustrated. It is a side view of the wall rail of the bridge upper structure in which the peeling repair structure of 2nd Example was constructed. It is a bottom view of the overhang | projection part of the bridge upper structure in which the peeling repair structure of 2nd Example was constructed. FIG. 6 is a partial vertical cross-sectional view of a bridge upper structure in which the peeling repair structure of the second embodiment is constructed, and is a vertical cross-sectional view taken along line VI-VI in FIGS. 4 and 5. It is explanatory drawing which showed the construction state of the peeling repair structure of 3rd Example, (a) is an overhang | projection part bottom view of the bridge upper structure in which the peeling repair structure was constructed, (b) is the same It is a partial longitudinal cross-sectional view of a bridge superstructure, Comprising: It is a longitudinal cross-sectional view in the BB line of (a). It is explanatory drawing which showed the construction state of the peeling repair structure of 4th Example, and is the floor slab bottom view of the bridge upper structure in which the peeling repair structure was constructed. It is the perspective view explaining what was constructed on the side of a bridge lower part structure, which is a peeling repair structure of another example, and (a) is a fold-curved surface shape in which an upper end of a vertical surface is connected to a lower end of a slope. The concrete surface is the repair range, and (b) is the arc-shaped concrete surface the repair range.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

  The peeling repair structure is a structure that is suitable for emergency and simple repairs during the specified repair life for heavy damaged parts and heavy damage prediction ranges on the concrete surface of concrete structures. This is to prevent the stripped concrete pieces from falling on the ground.

  Here, the predetermined repair useful life means the useful life of the peeling repair structure, and in this embodiment, a period of about 5 to 10 years is assumed.

  The concrete structure to be repaired by this exfoliation repair structure is a concrete structure with a reinforcing bar embedded in it, and a surface layer concrete ("cover (concrete)") with a predetermined thickness from the reinforcing bar to the concrete surface. It is also covered by.

  In the following examples, the embodiment of the peeling repair structure of the present invention relates to a portion of a bridge upper structure such as a reinforced concrete bridge which is a concrete structure, in particular, a floor slab lower surface, a floor slab side surface, a protruding portion lower surface, a ground cover. The case where there is a repair range on the concrete surface such as the side of the wall and the side of the wall rail shall be explained.

  FIG. 1 is an explanatory view showing a construction state of a peeling repair structure 10 according to an embodiment of the present invention. FIG. 1A shows a floor of a bridge upper structure 50 on which the peeling repair structure 10 is constructed. FIG. 1 (b) is a partially enlarged view of FIG. 1 (a). In addition, the arrow in Fig.1 (a) has shown the especially remarkable thing among the damage progress directions from which the expansion of damage is estimated from a heavy damage part.

  2 is a longitudinal sectional view of the peeling repair structure 10 of FIG. 1 (a), and FIG. 3 is a bottom view of a floor slab of a bridge upper structure 50 similar to that of FIG. 1 (a). The repair range Ra before construction of the peeling repair structure 10 is illustrated.

  As shown in FIGS. 1 and 2, the peeling repair structure 10 is constructed on the concrete surface 51 on the lower surface of the floor slab of the bridge upper structure 50, and mainly the heavy damage portion 52 and the heavy damage prediction range on the concrete surface 51. The protective sheet 11 laid in the repair range Ra including 53, the adhesive fixing member 12 that adheres and fixes the protective sheet 11 to the concrete surface 51, and the adhesive fixing member 12 are provided on the protective sheet 11 separately. And a local reinforcing member 13 that locally reinforces the periphery of the severely damaged portion 52.

  Originally, the protective sheet 11 has fiber yarns and meshes in its entirety (see FIG. 4). In FIG. 1A, for the sake of convenience, a part of the protective sheet 11 is made of fibers. The yarn and the mesh are illustrated, and the fiber yarn and the mesh for the remaining portion are omitted.

  As shown in FIG. 3, the repair range Ra is a certain margin range Ra2 with respect to a range Ra1 that requires repair by the peeling repair structure 10 set on the concrete surface 51 (hereinafter referred to as “repair required range”) Ra1. Refers to the range to which

  This repair required range Ra1 is a range including the heavy damage portion 52 and the heavy damage prediction range 53 on the concrete surface 51. Based on the data and data relating to the peeling and floating that occurred in the past, the occurrence of peeling and floating, etc. It is estimated by comprehensively considering the progress and the local situation such as the thickness of the surface concrete 50a of the bridge upper structure 50 to be repaired.

  The severely damaged portion 52 is, for example, a severely damaged portion generated on the concrete surface 51 of the bridge upper structure 50, and particularly a damaged portion where the surface concrete 50a is separated (peeled) from the reinforcing bar 50b. For example, the severely damaged portion 52 includes a portion where the surface concrete 50a is peeled off, floated, or cracked in a state where the surface concrete 50a is separated from the reinforcing bar 50b due to rebar corrosion or the like.

  It should be noted that the heavy-damaged portion 52 is not limited to the portion where the surface concrete 50a is naturally peeled off from the concrete surface 51, but also the concrete surface 51 where the surface concrete 50a has already been completely peeled off from the reinforcing bars 50b. The part where the piece is peeled off is also included.

  Such damage in the heavy damage portion 52 is due to rebar corrosion caused by salt damage or the like, and the rebar corrosion is such that the smaller the thickness of the surface concrete 50a and the more easily the salt is supplied, It progresses rapidly. Further, it is conceivable that the adjacent portion of the heavy damaged portion 52 where the surface concrete 50a has already been peeled off or floated will also become a heavy damaged portion 52 in the near future.

  The heavy damage prediction range 53 is not the heavy damage portion 52 at the time of construction of the peeling repair structure 10, but is the range of the concrete surface 51 that is predicted to change into the heavy damage portion 52 within the repair lifetime. In other words, it refers to a range in which some emergency treatment is required in the repair lifetime including the adjacent portion of the severely damaged portion 52. The heavy damage prediction range 53 is within a range surrounded by a two-dot chain line in the accompanying drawings (the same applies hereinafter).

  As shown in FIGS. 1 and 2, the protective sheet 11 is laid on a concrete surface 51 that is a repair range Ra including a heavy damage portion 52 and a heavy damage prediction range 53, and the concrete surface is within the repair range Ra. The concrete piece peeled off from 51 is received and prevented from falling to the ground. For this reason, the protection sheet 11 has an area that can be covered (laid) in the repair range Ra including at least the heavy damage portion 52 and the heavy damage prediction range 53.

The protective sheet 11 has a load resistance (load resistance) that can safely support the weight of a concrete piece having a thickness of about 50 mm to 100 mm that is peeled off from the concrete surface 51, and has a weather resistance from the time of construction to the time of repair life. In particular, since the construction location of the peeling repair structure 10 is outdoors, the decrease in load resistance strength against ultraviolet deterioration is small until the repair lifetime has elapsed . For example, the protective sheet 11 has a tensile strength during construction of 40 kN / m or more.

  As the protective sheet 11, for example, a fiber made of polyester, acrylic, nylon, aramid, vinylon, or other synthetic resin or a continuous fiber sheet having flexibility formed in a sheet shape from carbon fiber is used. The continuous fiber sheet is knitted into a flexible mesh-like body with a yarn (hereinafter referred to as “fiber yarn”) 11a bundled with the above-described synthetic resin fibers or carbon fibers. A net-like body having a net, a knotless net, a braided net, a main net, or other net-like nets, or a net-like body having a mesh net or other mesh-like net.

  In the following description, a net-like continuous fiber sheet is used as the protective sheet 11, but the form of the protective sheet 11 is not necessarily limited to the net-like body. For example, the protective sheet 11 may have a large number of holes. It may be a flexible sheet-like material that can be impregnated or penetrated with an uncured adhesive through a large number of holes.

  The continuous fiber sheet used for the protective sheet 11 is one in which the fibers of the fiber yarn 11a are fixed to each other and integrated by covering the fiber yarn 11a with a coating material. When the protective sheet 11 is laid, it is prevented that the fiber yarn 11a is scattered and difficult to handle, and individual fibers of the fiber yarn 11a are rubbed and cut by the concrete surface 51 to reduce wear resistance and load resistance strength. Is prevented. For the covering material, various resin coating materials such as vinyl chloride, acrylic resin, and polyethylene resin are used.

  In particular, as a continuous fiber sheet used for the protective sheet 11, it has been confirmed by a weather resistance test that the decrease in tensile strength due to atmospheric exposure for 5 years is about 30%, and the adhesiveness by an adhesive is improved. Therefore, a net-like body in which a polyester fiber yarn 11a is coated with a vinyl chloride coating material is suitable.

  Further, the protective sheet 11 can prevent the piece of concrete peeled off from the concrete surface 51 from dropping out, and even when the protective sheet 11 is laid in the repair range Ra of the concrete surface 51, the concrete sheet 51 passes over the protective sheet 11. It has transparency that allows visual observation of the progress of deterioration. For this reason, as the continuous fiber sheet used for the protective sheet 11, a mesh body having a mesh size of about 10 mm × 10 mm in length and width is suitable (see FIG. 1B).

  Thus, since the protective sheet 11 is a mesh body having a large number of meshes 11b, even when rainwater or the like enters between the protective sheet 11 and the concrete surface 51, such rainwater or the like passes through each mesh 11b. It can also be dropped and discharged.

  The adhesive fixing member 12 is for fixing and holding the protective sheet 11 on the concrete surface 51. This adhesive fixing member 12 has a protective sheet 11 against the concrete surface 51 outside the heavy damage portion 52 and the heavy damage prediction range 53 (the outer edge side of FIG. 1 (a), the left and right sides of FIG. 2). It is formed of an adhesive that adheres a part.

  Specifically, the adhesive fixing member 12 is continuously formed in a band shape with a constant application width (for example, a width of about 50 mm) along a pair of opposing edges of the peripheral edge of the protective sheet 11. Note that the adhesive fixing member 12 may be continuously formed in a strip shape with a constant coating width on the entire periphery of the peripheral portion of the protective sheet 11 (see FIGS. 4 and 5).

  The adhesive fixing member 12 is a composite in which the adhesive applied to the peripheral portion of the protective sheet 11 and the peripheral portion of the protective sheet 11 bonded to the concrete surface 51 by the adhesive are integrated. Yes. As shown in FIG. 2, the adhesive fixing member 12 has an adhesive coating layer (hereinafter referred to as “adhesive layer”) 12 a having a thickness equal to or greater than the thickness of the protective sheet 11. The protective sheet 11 is buried. Specifically, the application amount of the adhesive of the adhesive fixing member 12 is about 2.5 kg / m 2.

  The local reinforcing member 13 is used to locally reinforce the periphery of the heavily damaged portion 52. The local reinforcing member 13 is provided separately from the adhesive fixing member 12 at a position separated from the above-described adhesive fixing member 12 on the side of the severely damaged portion 52 (center side in FIGS. 1A and 2). Yes. The local reinforcing member 13 is provided on the concrete surface 51 around the heavy damaged portion 52. Specifically, the local reinforcing member 13 has a certain coating width (for example, so as to surround the entire circumference of the heavy damaged portion 52 without leaving it). , And a width of about 50 mm).

  Moreover, the local reinforcement member 13 is provided so that it may cross | intersect the damage progress direction (arrow in FIG. 1 (a)) from which damage is estimated to expand from the heavy damage part 52 of the concrete surface 51. FIG. For this reason, when peeling off from the heavy damage part 52 expands in the damage progress direction, the progress of the damage is stopped by the local reinforcing member 13, and the expansion of the damage to the outside of the local reinforcing member 13 is suppressed.

Moreover, if the damage expands from the severely damaged portion 52 to the concrete surface 51 inside the local reinforcing member 13 and the concrete piece peels off or peels off, such a concrete piece is localized on the protective sheet 11. At this time, the protective sheet 11 is bonded to the concrete surface 51 by the local reinforcing member 13 (adhesive layer 13a) adjacent to the periphery of the heavily damaged portion 52. Therefore, the peeled concrete piece can be received and supported more firmly than in the case where the adhesive fixing member 12 is simply used for adhesion and fixing at a location away from the heavy damage portion 52.

  Further, the local reinforcing member 13 is provided with a predetermined interval L between the inner periphery thereof and the outer periphery of the heavily damaged portion 52, and this interval L has a length equal to or greater than the thickness (cover) of the surface concrete 50a. Has been. There is a high risk that the surface concrete 50a and the reinforcing bars 50b are already separated from the outer peripheral edge of the heavy damage portion 52 within the interval L. Even if the local reinforcing member 13 is provided at such a location, the heavy damage portion 52 is provided. This is because there is a possibility that the progress of the expansion of the project cannot be sufficiently suppressed.

  The local reinforcing member 13 is formed of a composite body in which a part of the protective sheet 11 and an adhesive that adheres a part of the protective sheet 11 to the concrete surface 51 around the heavy damaged part 52 are integrated. The periphery of the heavy damage portion 52 is locally reinforced by the composite. The adhesive used for the local reinforcing member 13 is the same type as the adhesive fixing member 12 described above.

  And the local reinforcement member 13 is formed in the thickness which the adhesive layer 13a covers to the surface (surface opposite to the concrete surface 51) of the protection sheet 11, as shown in FIG. 2, and in this adhesive layer 13a The protective sheet 11 is buried. Specifically, the application amount of the adhesive of the local reinforcing member 13 is about 2.5 kg / m2.

  In these adhesive fixing member 12 and local reinforcing member 13, since the protective sheet 11 is a mesh body having a large number of meshes 11b, the adhesive passes through the protective sheet 11 through the large number of meshes 11b, and the adhesive layer 12a. , 13a and embedded in a state of wrapping the fiber yarn 11a (also referred to as mesh yarn or mesh wire) of the protective sheet 11 (see FIG. 2).

  Therefore, according to the adhesive fixing member 12, the protective sheet 11 is not simply bonded to the adhesive surface, but the protective sheet 11 is held by the adhesive layers 12 a and 13 a which are cured adhesives. It can be firmly held with its form. Further, the local reinforcing member 13 does not locally reinforce the concrete surface 51 by the adhesive strength of the adhesive, but is a composite in which the protective sheet 11 is included in the adhesive layers 12a and 13a, which are cured adhesives. Thus, the concrete surface 51 can be strongly reinforced.

  Here, the adhesive used for the adhesive fixing member 12 and the local reinforcing member 13 includes, for example, an epoxy resin adhesive, an acrylic resin adhesive, a silicone resin adhesive, and other impregnating materials that are also used as non-landscape correction materials. Adhesive is used. And about this adhesive agent, what can maintain the adhesive strength (adhesion strength) of 1.5 N / mm <2> or more during a repair lifetime is suitable.

  For example, as a result of a test by the applicant of the present application, an epoxy resin-based and acrylic resin-based adhesive is applied at an application amount of about 2.4 kg / m 2 and an application width of about 50 mm. It has been confirmed that an adhesive strength of about 5 to 3.3 N / mm 2 is obtained, and it can be said that it is suitable as an adhesive used for the adhesive fixing member 12 and the local reinforcing member 13.

  In addition, in this adhesive, a pigment having a color different from that of the concrete surface 51 and the protective sheet 11 is mixed in order to increase the visibility of the application site. This pigment enhances the visibility of the adhesive applied on the concrete surface 51, so that the application site of the adhesive is not lost when the peeling repair structure 10 is constructed, and the protective sheet 11 is laid after the protective sheet 11 is laid. 11, the positions of the adhesive layers 12a and 13a can be easily confirmed.

  Moreover, this adhesive has the property which can adhere | attach the concrete surface 51 and the protection sheet 11, and the adhesive strength exceeds the breaking strength of the protection sheet 11, and bridge | bridging superstructure 50 used as repair range Ra It has a high viscosity so that it does not sag after application to the side wall surface or the lower surface of the steel, and further has a weather resistance that lasts from the construction to the time of repair life.

  Moreover, since this adhesive has an impregnation property to concrete, for example, it is possible to bond a crack that is latent in the surface concrete 50a, and the adhesive that is a part of the adhesive fixing member 12 and the local reinforcing member 13 is the surface layer. By impregnating the inside of the concrete 50a and curing, the adhesive strength between the adhesive fixing member 12 and the local reinforcing member 13 and the bridge upper structure 50 is further enhanced.

  Next, the construction (manufacturing) method of the peeling repair structure 10 configured as described above will be described. First, when a severely damaged portion 52 is found on the concrete surface 51 of the bridge superstructure 50, as shown in FIG. 3, a repair required range Ra1 including the heavily damaged portion 52 is estimated, and this repair required range A range obtained by adding a margin range Ra2 to Ra1 is set on the concrete surface 51 as a repair range Ra. Then, the ground surface treatment is performed on the concrete surface 51 within the repair range Ra.

  In this base treatment, first, a range in which a portion of the severely damaged portion 52 existing in the repair range Ra is confirmed to be peeled or lifted by visual inspection or hammering can be knocked down by a hammer or other impacting tool. Thus, the surface concrete 50a is knocked down and forcibly removed. Further, even for the heavily damaged portion 52 where the surface concrete 50a has already been partially naturally peeled off, the surface concrete 50a barely remaining there is knocked down and forcibly removed.

  Then, the weakened portions 52a of the concrete and the reinforcing bars 50b are arranged by performing cleansing using a tool such as a diamond disc sander on the concave surface 52a of the heavy damage portion 52 from which the surface concrete 50a is naturally peeled off or forcibly removed. Then, the latency layer is removed, and the kelen powder adhering to the concave surface 52a of the heavily damaged portion 52 is blown off by an air gun or a blower to be removed.

  And the impregnated adhesive is applied to the surface of the concrete portion on the concave surface 52a of the severely damaged portion 52 treated in this way to form the surface coating layer 14, and the reinforcing bar 50b A rust inhibitor is applied to the surface of the exposed portion. Then, by impregnating the concrete portion of the heavy damage portion 52 with the adhesive, for example, a crack or the like that appears or is latent in the heavy damage portion 52 or a separation portion of the concrete is bonded.

  This is because the expansion of the damage is suppressed, and the occurrence of new peeling, floating or cracking of the concrete in the heavy damage portion 52 is also suppressed. Note that the surface covering layer 14 may be formed on the exposed portion of the reinforcing bar 50b by applying an impregnating adhesive after applying a rust preventive agent.

  Note that the surface coating layer 14 is not necessarily provided in the heavily damaged portion 52, and may be omitted if it is unnecessary as a result of determining the damage state of the heavily damaged portion 52, for example. The impregnating adhesive used for the surface coating layer 14 is different from the adhesive used for the adhesive layers 12a and 13a.

  Further, in the severely damaged portion 52 where no peeling or lifting is confirmed, for example, a cracked portion or the like, an impregnating adhesive is applied to the concrete surface 51 including the crack so that the surface coating layer 14 is formed. By being formed, the expansion of cracks is suppressed. After the above ground processing, the protective sheet 11 is laid.

  In the laying process of the protective sheet 11, after a predetermined amount of adhesive is applied to the concrete surface 51 where the adhesive fixing member 12 is disposed and the local reinforcing member 13 is disposed using a coating spatula, As shown in FIG. 1 and FIG. 2, the protective sheet 11 is laid so as to cover the entire repair range Ra from above the adhesive layers 12a and 13a. After the protective sheet 11 is laid, the protective sheet 11 is pressed against the concrete surface 51, and the portions of the protective sheet 11 that overlap the adhesive layers 12a and 13a are embedded in the adhesive layers 12a and 13a.

  After the protection sheet 11 is embedded, the adhesive coming out from the mesh 11b of the protection sheet 11 is leveled so that the protection sheet 11 is completely embedded in the adhesive layers 12a and 13a. , 13a is made uniform, and an additional adhesive is further applied from the top of the protective sheet 11 to a portion where the adhesive application amount is insufficient.

  Here, the working conditions of the laying process of the protective sheet 11 are preferably such that the moisture content of the concrete surface 51 is 8% or less, the outside air temperature is 5 ° C. or more, and the humidity is 85% or less. It is preferable that there is no rainfall during curing. For this reason, when rainwater or strong winds during raining are predicted during the curing period for curing the adhesive, it is necessary to cover the entire repair range Ra with a vinyl sheet or the like for curing.

  Next, a modification of the above embodiment will be described with reference to FIGS.

  4-6 is explanatory drawing which showed the construction state of the peeling repair structure 20 of 2nd Example, FIG. 4 is a side view of the wall height column of the bridge upper structure 50 in which the peeling repair structure 20 was constructed. 5 is a bottom view of the overhanging portion of the bridge upper structure 50, and FIG. 6 is a partial longitudinal sectional view of the bridge upper structure 50, which is shown in FIG. 4 and FIG. It is a longitudinal cross-sectional view in the -VI line.

  In FIG. 5, for the same purpose as in FIG. 1, only a part of the fiber sheet and mesh of the protection sheet 11 that is not shown is omitted, and the arrow in FIG. It shows particularly remarkable damage progress directions that are expected to expand.

  As shown in FIGS. 4 to 6, the peeling repair structure 20 of the second embodiment changes the repair range Ra to the above-described peeling repair structure 10 of the first embodiment and is added to a part of the protective sheet 11. A cutout portion 21 for avoiding the object 55 is added, and the arrangement of the adhesive fixing member 12 and the local reinforcing member 13 is changed. In the following, the same parts as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and only different parts are described.

  As shown in FIG. 4, the peeling repair structure 20 of the second embodiment repairs a concrete surface 51 that spans from the wall rail side surface 51 a of the bridge upper structure 50 through the corner portion 51 b to the overhanging portion lower surface 51 c. At the top of the wall rail side 51a, which is part of the repair range Ra, there are a number of support posts for fallen object prevention fences attached to the road bridge (concrete structure) as additives 55 Has been.

  For this reason, the protective sheet 11 of the peeling repair structure 20 is provided with a plurality of concave cutout portions 21 for removing the additives 55 from a part of the protective sheet 11. Each notch 21 is formed by cutting and cutting a part of the protective sheet 11 using a cutting tool such as scissors, and can be easily adapted to the size and position of the additive 55 of the concrete structure on site. And it is processed quickly.

  As shown in FIGS. 4 to 6, the heavy damage portion 52 to be repaired by the peeling repair structure 20 is generated in the vicinity of the corner portion 51 b on the lower surface 51 c of the overhang portion of the bridge upper structure 50, and the heavy damage is caused. It is speculated that the expansion of the damage starting from the portion 52 is particularly likely to progress in the extending direction of the bridge upper structure 50 (the left-right direction in FIGS. 4 and 5 and the direction perpendicular to the plane of FIG. 6). The It is also predicted that the heavy damage prediction range 53 exists in the extending direction of the bridge upper structure 50. Therefore, the repair range Ra is set to a horizontally long range in the extending direction of the bridge upper structure 50.

  The protective sheet 11 is formed in a laterally long rectangular shape that can be laid over the entire laterally repaired area Ra (the lateral direction in FIGS. 4 and 5), and the longitudinal direction extends from the bridge upper structure 50. It is directed in the installation direction (the left-right direction in FIGS. 4 and 5 and the direction perpendicular to the paper surface in FIG. 6).

  The adhesive fixing member 12 is continuously formed in a belt shape from the main fixing portion 121 provided in a continuous belt shape to the entire periphery of the peripheral edge of the protective sheet 11 and from one end to the other end in the longitudinal direction of the protective sheet 11. A plurality of sub-fixing portions 122 formed at predetermined pitch intervals in the lateral direction of the protective sheet 11 are provided substantially parallel to the edges on both sides in the lateral direction. However, the adhesive fixing member 12 remains the same to bond only a part of the protective sheet 11 to the concrete surface 51.

  In terms of the load resistance strength for adhesively fixing the protective sheet 11 to the concrete surface 51, the adhesive fixing member 12 is sufficient only by the adhesive fixing by the main fixing portion 121, but in addition to the main fixing portion 121, a plurality of the fixing and fixing members 12 are provided. By bonding and fixing the protective sheet 11 to the concrete surface 51 via the sub-fixing portion 122, for example, even when concrete deterioration or an adhesion defect occurs at the bonding location by the main fixing portion 121, protection is provided via the sub-fixing portion 122. The sheet 11 can be supported on the concrete surface 51.

  As shown in FIG. 5, the heavy damage portion 52 of the bridge upper structure 50 occurs on the concrete surface 51 of the lower surface 51 c of the overhang portion, and the local reinforcing member 13 is formed around the heavy damage portion 52. ing. The local reinforcing member 13 is a corner portion 51b of the periphery of the heavy damaged portion 52 on the lower surface 51c of the overhang portion, whereas the local reinforcing member 13 of the first embodiment is provided around the entire periphery of the heavy damaged portion 52. It is not provided on the side, and is formed on the concrete surface 51 so as to surround the heavily damaged portion 52 with a U-shaped planar form with the corner 51b open.

  This is because, when the damage expands from the heavy damage portion 52 generated near the corner portion 51b of the above-described lower surface 51c of the overhang portion, the possibility that the damage expands and progresses toward the corner portion 51b side is particularly significant. Since the possibility of expanding and extending in the extending direction of the body 50 (the left-right direction in FIGS. 4 and 5 and the direction perpendicular to the paper surface of FIG. 6) is extremely low, local reinforcement on the corner 51b side of the protruding portion lower surface 51c The member 13 is omitted.

  Further, since the protective sheet 11 has flexibility, as shown in FIG. 6, even in the case where the heavily damaged portion 52 exists in the vicinity of the corner portion 51 b of the protruding portion lower surface 51 c, the shape of the corner portion 51 b is obtained. It can be bent so as to fit, and can be laid along the wall rail side surface 51a and the overhanging portion lower surface 51c so as to straddle the corner portion 51b.

  FIG. 7 is an explanatory view showing a construction state of the peeling repair structure 30 of the third embodiment. FIG. 7A is a bottom view of the overhanging portion of the bridge upper structure 50 in which the peeling repair structure 30 is constructed. FIG. 7B is a partial longitudinal sectional view of the bridge upper structure 50, and is a longitudinal sectional view taken along line BB in FIG. 7A. In FIG. 7A, for the same purpose as in FIG. 1, only a part of the fiber yarn and mesh of the protective sheet 11 are shown and the remaining portions are omitted.

  As shown in FIG. 7, the peeling repair structure 30 of the third embodiment is different from the above-described peeling repair structure 20 of the second embodiment in that the shape of the overhanging portion lower surface 51c of the bridge upper structure 50 is changed. In addition, the arrangement of the adhesive fixing member 12 is changed. Hereinafter, the same parts as those in the first and second embodiments are denoted by the same reference numerals, the description thereof is omitted, and only different parts will be described.

  According to the peeling repair structure 30 of the third embodiment, the unevenness portion 51c1 existing on the lower surface 51c of the overhang portion of the bridge upper structure 50 is included in a part of the repair range Ra. Such an uneven portion 51c1 is difficult to apply the adhesive used for the adhesive fixing member 12, and it is also difficult to lay the protective sheet 11 along the concrete surface of the uneven portion 51c1. It is assumed that the protective sheet 11 is difficult to adhere and fix to the concrete surface by the member 12.

  Therefore, in the peeling repair structure 30 of the third embodiment, the protection sheet 11 is bent so as to bypass the concavo-convex portion 51c1 as shown in FIG. 7B by utilizing the flexibility of the protection sheet 11. Then, the protective sheet 11 is laid on the overhanging portion lower surface 51c, and an adhesive is applied to the concrete surface of the overhanging portion lower surface 51c so as to avoid the uneven portion 51c1, whereby the protective sheet 11 is bonded and fixed. A member 12 is formed.

  As described above, the adhesive fixing member 12 may be formed in a discontinuous band shape so as to be interrupted in the middle as long as the adhesive strength sufficient to ensure the load bearing strength of the protective sheet 11 can be exhibited. There is no need to form. In such a case, the adhesive strength of the adhesive is proportional to the adhesive application area (adhesion area) if the adhesive application amount (application thickness) is substantially uniform. Strength can be supplemented.

  For example, the adhesive fixing member 12 may be provided discontinuously as in the peeling repair structure 40 of the fourth embodiment.

  FIG. 8 is an explanatory view showing a construction state of the peeling repair structure 40 of the fourth embodiment, and is a bottom view of the floor slab of the bridge upper structure 50 on which the peeling repair structure 40 is constructed. In FIG. 8, for the same purpose as in FIG. 1, the fiber yarns and meshes of the protective sheet 11 are partially omitted, and the arrows in FIG. It shows particularly remarkable damage progress directions that are expected to expand.

  As shown in FIG. 8, the peel repair structure 40 of the fourth embodiment is obtained by changing the arrangement of the adhesive fixing member 12 with respect to the peel repair structure 10 of the first embodiment described above. In the following, the same parts as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and only different parts are described.

  According to the peeling repair structure 40 of the fourth embodiment, the adhesive fixing member 12 is formed in a band shape having a certain application width along a pair of opposing edges of the peripheral edge portion of the protective sheet 11, and is spaced at predetermined intervals. It is formed intermittently. Since the adhesive fixing member 12 has an application width larger than that of the first embodiment, it is prevented that the adhesion area is reduced as compared with the first embodiment, and the load resistance strength of the protective sheet 11 is reduced. Adhesive strength sufficient to maintain this is ensured.

  The present invention has been described based on the embodiments. However, the present invention is not limited to the above-described embodiments, and various improvements and modifications can be easily made without departing from the spirit of the present invention. It can be guessed. For example, in the above embodiment, the description has been given using the square shape of the mesh 11b of the protection sheet 11, but the mesh shape of the protection sheet is not necessarily limited to this, for example, a turtle shell shape, a rhombus shape, and the like The shape may also be

  Moreover, in the said Example, although the thing of the mesh body was used for the protection sheet 11, the form of this protection sheet is not necessarily limited to a mesh body, Many holes are drilled and it has flexibility. A sheet-like body may be sufficient. According to the protective sheet having such a large number of holes, the protective sheet can be embedded in the adhesive layer by passing the adhesive through the large number of holes as described above, and moisture permeability can be secured. . In addition, if the size of each hole is large, the transparency can be secured, and even if the size of each hole is small, the transparency can be imparted to the protective sheet itself using a transparent material.

  Moreover, in the said Example, although the thing of the net | network body whose mesh size is about 10 mm x 10 mm in length and width was illustrated as the protection sheet 11, the mesh size of a protection sheet is not necessarily limited to this, The concrete piece which peeled off of the concrete piece It may be larger or smaller as long as it can prevent falling to the ground. If the transparency of the protective sheet is reduced by reducing the mesh size, the protective sheet itself may be formed of a transparent material.

  In the above embodiment, the continuous fiber sheet used for the protective sheet 11 has been described using a net-like body in which fiber yarns are covered with a covering material and the fibers of the fiber yarns are fixed to each other. The continuous fiber sheet of the fiber network used for the protective sheet is not necessarily limited to one in which fiber yarns are coated with a coating material, and is not coated with such a coating material. May be.

  For example, when the protective sheet is laid across the corner portion (51b) of the concrete structure (50), there is a danger that the protective sheet rubs against the corner portion (51b) and the fibers of the fiber yarn are cut. The continuous fiber sheet used for the protective sheet is particularly a fiber if there is no problem, there is no problem in the wear resistance and load resistance of individual fibers in the fiber yarn, and the fibers are not very handled due to scattering etc. The yarn does not have to be covered with a covering material.

  In addition, when the fiber yarn of the continuous fiber sheet used for the protective sheet is not coated with the coating material, the adhesive is impregnated between the fibers of the fiber yarn of the protective sheet. The bond strength with the adhesive becomes stronger.

  Moreover, in the said Example, repair range Ra of the peeling repair structure 100 is concrete, such as the part of the bridge upper structure 50 which is a concrete structure, especially a floor slab lower surface, a ground bottom surface, a ground side surface, a wall railing side surface, etc. Although the surface 51, the repair range Ra is not necessarily limited to these, and the bridge substructure (including piers and abutments) of a reinforced concrete bridge 60 may be a concrete surface of other concrete structures. Good (see FIG. 9).

  FIG. 9 is a perspective view for explaining the peeling repair structure 100 constructed on the side surface of the bridge lower structure 60. FIG. 9A shows that the upper end of the vertical surface 61b is connected to the lower end of the slope 61a. The folded curved concrete surface 61 is set as the repair range Ra, and FIG. 9B shows the arc-shaped concrete surface 61 as the repair range Ra.

  Further, in the first embodiment, the local reinforcing member 13 is formed in a square shape (square shape) so as to surround the entire circumference of the severely damaged portion 52, and in the second embodiment, the periphery around the heavily damaged portion 52 is uniform. The local reinforcing member 13 is formed in a U shape so as to surround the portion, but the planar shape of the local reinforcing member 13 is not necessarily limited thereto.

  For example, as long as it is provided so as to intersect the extension line in the damage progress direction in which the expansion of damage from the severely damaged portion 52 is predicted, for example, a straight line, a curved line, a broken line, a wavy line, and other lines Or a circular shape, an elliptical shape, a cloud shape, a polygonal shape or the like surrounding the entire circumference of the heavy damage portion 52.

  Moreover, in the said Example, although the adhesive fixing member 12 which adhere | attaches the protective sheet 11 on the concrete surface 51 with the contact bonding layer 12a was used as a fixing holding means of the protective sheet 11 with respect to the concrete surface 51, the fixed holding means of this protective sheet Are not necessarily limited to those made of an adhesive. For example, a rectangular and flat retaining plate is laid on the protective sheet, and the protective sheet is placed between the retaining plate and the concrete surface. In this state, the holding plate may be fixed using a concrete fixture such as an anchor bolt.

  That is, instead of the adhesive fixing member 12 in the above-described embodiment, a holding plate having a size corresponding to the location of the adhesive fixing member 12 is prepared, and the holding plate is installed at the location of the adhesive fixing member 12. The protective sheet 11 is sandwiched between the retaining plate and the concrete surface 51 by laying in the existing portion, and the retaining plate is fixed to the concrete surface 51 with a concrete fixture in this state. good.

10, 20, 30, 40, 100 Peeling repair structure (concrete surface repair structure)
11 Protective sheet 11b Mesh 12 Adhesive fixing member 13 Local reinforcing member 51 Concrete surface 52 Heavy damage portion 53 Heavy damage prediction range Ra Repair range

Claims (6)

Concrete surface repair for simple and emergency repairs to the severely damaged portion where severe damage occurs on the concrete surface and the predicted serious damage range of the heavy damaged portion within the repair life of the concrete surface Structure,
The concrete surface is laid in a repair area that includes both the heavy damage portion and the heavy damage prediction range on the concrete surface, is formed into a flexible mesh with many meshes, and the concrete surface is laid in the repair area. A protective sheet that can be seen through;
An adhesive fixing member that is formed of an adhesive that adheres a part of the protective sheet to the concrete surface that is outside the heavy damage portion and the heavy damage prediction range, and fixes a part of the protective sheet to the concrete surface;
An adhesive that is provided at a position separated from the adhesive fixing member on the side of the severely damaged portion and adheres a part of the protective sheet to the concrete surface around the severely damaged portion, and the protective that is adhered to the concrete surface by the adhesive. A concrete surface repair structure comprising a local reinforcing member that is formed of a composite integrated with a part of a sheet and locally reinforces the periphery of a heavily damaged portion by the composite. In concrete surface repair structure according to claim 1, wherein,
Instead of the protective sheet, the protective sheet is laid in a repair range including both a heavy damage portion and a heavy damage prediction range on the concrete surface and is formed into a flexible sheet shape having a large number of holes. A concrete surface repair structure characterized by comprising:   3. The local reinforcement member according to claim 1, wherein the local reinforcement member is provided so as to intersect with an extension line in a damage propagation direction in which damage is predicted to be expanded from a heavy damage portion on a concrete surface. Concrete surface repair structure. The concrete surface repair structure according to any one of claims 1 to 3, wherein the local reinforcing member is provided in a belt shape around the entire periphery of the heavily damaged portion of the concrete surface.   The concrete surface repair structure according to any one of claims 1 to 4, wherein the adhesive fixing member is formed in a belt shape at a peripheral portion of the protective sheet.   In the concrete surface repair structure according to any one of claims 1 to 5,
  In place of the adhesive fixing member, in order to fix a part of the protective sheet to the concrete surface outside the heavy damage portion and the heavy damage prediction range, a pressing plate sandwiching the protective sheet between the concrete surface, A fixing holding means having a fixing member for fixing the retaining plate to the concrete surface;
  A concrete surface repair structure according to claim 1, wherein the local reinforcing member is provided at a position spaced apart from the fixing and holding means toward the heavily damaged portion.

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