JP2020111954A - Exfoliation prevention sheet, exfoliation prevention structure and construction method thereof - Google Patents

Abstract

To provide an exfoliation prevention sheet capable of exhibiting excellent followability to an attachment surface with irregularity and bend as well as facilitating handling at installation with good shape retention.SOLUTION: An exfoliation prevention sheet 1 comprises a net-like mesh sheet 2, and a retention member 3 in a lattice shape laminated on one of surfaces of the mesh sheet 2 and secured on the mesh sheet 2, wherein an interval between cross rails 31, 31 of the retention member 3 is formed larger than an interval of muntins 32, 32 of the retention member 3, and rectangle openings 33 surrounded with cross rails 31 and muntins 32 of the retention member 3 are vertically and horizontally arranged.SELECTED DRAWING: Figure 2

Description

The present invention relates to a peeling prevention sheet, a peeling prevention structure, and a method for constructing the same, which prevent falling of flakes separated from a structure such as a concrete structure.

Conventionally, as a peeling-preventing sheet that prevents falling of flakes peeled from the surface of a concrete structure that has deteriorated over time, a synthetic resin sheet on which a shape-retaining body of Patent Document 1 is stacked, a mesh mesh sheet of Patent Document 2, and a patent document There is known a mesh-like mesh sheet in which the FRP lattice streaks of No. 3 are overlapped (see FIG. 7 of Patent Document 3, paragraphs [0045] to [0049]).

These synthetic resin sheets and mesh sheets are soft and easily change shape when used alone, so even if there are irregularities or curved parts on the mounting surface, they easily fit on the mounting surface, but the shape retention is low as a single unit. It is difficult to handle during installation work. Such inconvenience of handling at the time of construction can be eliminated to some extent by providing the shape retainer of Patent Document 1 or the FRP lattice streaks of Patent Document 3 on a sheet.

JP, 2015-129406, A JP 2001-355343 A Patent 2006-9266

By the way, when constructing the anti-stripping structure with a mesh-like mesh sheet, the mesh sheet of Patent Document 3 is used in which the FRP lattice reinforcement is provided so that square openings of a size corresponding to the washer and the anchor bolt are arranged vertically and horizontally. As a result, it is easy to handle at the time of construction, but it is difficult to adapt it to the mounting surface. That is, although the mesh sheet on which the FRP lattice streak is superposed has good shape retention due to the high rigidity of the FRP lattice streak forming the square opening, due to too high rigidity and shape retention, unevenness and curved portion It becomes difficult to follow a certain mounting surface. Therefore, there is a demand for a peeling-preventing sheet capable of following an attachment surface having irregularities or curved portions and having good shape retention.

The present invention is proposed in view of the above problems, and can exhibit excellent conformability to a mounting surface having unevenness or a curved portion, has good shape retention, and facilitates handling during construction. An object of the present invention is to provide a peeling-preventing sheet that can be used, a peeling-preventing structure using the peeling-preventing sheet, and a method for constructing the same.

The exfoliation prevention sheet of the present invention comprises a mesh sheet and a lattice-shaped shape-retaining material that is fixed to the mesh sheet by being laminated on one surface of the mesh sheet. The mutual spacing is formed larger than the mutual spacing of the vertical bars of the shape retaining material, and the horizontal rails of the shape retaining material and the rectangular openings surrounded by the vertical rails are arranged vertically and horizontally. And
According to this, by the shape-retaining material in which the rectangular openings to be overlapped with the mesh sheet are arranged vertically and horizontally, it is possible to obtain an appropriate shape-retaining property. In addition, the interval between the horizontal bars of the shape-retaining material is formed to be larger than the interval between the vertical bars of the shape-retaining material, and the rectangular openings are arranged vertically and horizontally to facilitate bending of the peeling prevention sheet in the horizontal direction. Therefore, the peeling-preventing sheet can be deformed to fit the unevenness and the curved portion. That is, it is possible to provide a peeling-preventing sheet that can exhibit excellent conformability to a mounting surface having irregularities or curved portions, has good shape retention, and can be easily handled during construction. it can.

The exfoliation prevention structure of the present invention is arranged so that the mesh sheet of the exfoliation prevention sheet of the present invention is arranged on the attachment surface side of a concrete structure and substantially laid along the attachment surface, and is placed on the concrete structure. The plate is pressed to the mounting surface side by a nut screwed to the anchor, and the shape-retaining material is pressed to the mounting surface side by the plate to attach the peeling prevention sheet.
According to this, the shape-preserving material can be pressed by the plate to easily attach the exfoliation prevention sheet to the attachment surface. Furthermore, this peeling prevention structure can also exhibit the same effect as the peeling prevention sheet of the present invention.

The exfoliation prevention structure of the present invention is such that the exfoliation prevention sheet is laid so as to substantially follow the surface of the lining concrete surface of the tunnel or the primer layer formed on the lining concrete surface, and the crosspiece of the shape retaining material is The peeling-preventing sheet is arranged such that a longitudinal direction in which the vertical bars are lined up is a circumferential direction of the tunnel and a horizontal direction in which the vertical bars of the shape retaining material are lined up is a tunnel axis direction.
According to this, the lining concrete surface of the tunnel often has a curved part, a dented part, and a protruding part in the digging direction, but the stripping prevention sheet is Since it is easily bent and deformed, by laying a stripping prevention sheet with the horizontal direction aligned with the tunnel axis direction, it is easy to bend the curved surface, the dented portion, or the protruding portion on the lining concrete surface in the excavation direction. Can be followed. In addition, in the vertical direction in which the horizontal rails of the shape-retaining material are arranged, the peeling-preventing sheet exhibits appropriate rigidity such that it flexes in the circumferential direction of the tunnel, so that it can be handled easily.

In the anti-stripping structure of the present invention, step portions that float up to the side opposite to the anti-stripping sheet are formed at both ends in the width direction of the plate, and the distance between the step portions at both ends is such that the vertical bars of the shape retainer are mutually The vertical bars of the shape-retaining material are set to correspond to the intervals, and the vertical bars of the shape-retaining material are pressed toward the attachment surface side to attach the peel-off prevention sheet.
According to this, the vertical bars of the shape-retaining material can be pressed against the mounting surface side by the step portions at both ends, and the exfoliation prevention sheet can be easily mounted on the mounting surface. Further, since the step portions at both ends press the vertical bars of the shape retention material, it is easy to move and attach the plate or the step portion in the longitudinal direction of the rectangular opening, and the anchor is attached when attaching the exfoliation prevention sheet. It is possible to flexibly adapt to changes and adjustments of the place of placing.

The method for constructing the anti-stripping structure of the present invention is a method for constructing the anti-stripping structure of the present invention, wherein the anti-stripping sheet is arranged by forming a primer layer on the construction surface of the concrete structure, and the anti-stripping sheet. First step of forming perforations in the concrete structure so as to penetrate the mesh sheet and the primer layer, and the anchor in which the plate is externally inserted and the nut is screwed to the rear side of the plate. Is inserted into the perforation and the anchor is driven into the concrete structure, and a third step is performed in which the nut is screwed in and the shape retaining material is pressed against the mounting surface side by the plate. It is characterized by
According to this, even the primer layer can prevent the construction surface of the concrete structure from falling off. In addition, by pressing the shape-retaining material of the anti-stripping sheet to the mounting surface side with the plate, the mesh sheet can be brought into close contact with the primer layer to ensure reliable anti-shedding, and the mesh sheet and the primer layer can be kept in close contact with each other. A reinforcing effect can be obtained by pressing the shape member to the mounting surface side.

By using the exfoliation-preventing sheet of the present invention, it is possible to exhibit excellent conformability to a mounting surface having unevenness or a curved portion, and since it has a good shape retention property, handling at the time of construction is facilitated. be able to.

The plane explanatory view of the exfoliation prevention sheet of an embodiment by the present invention. The partial front view in the state where the plate, the anchor, and the nut are arranged on the exfoliation prevention sheet of the embodiment. FIG. 3 is a partial perspective view showing a state where a plate, an anchor, and a nut are arranged on the exfoliation prevention sheet of the embodiment. (A) is a front view of an anchor used for attaching the exfoliation prevention sheet of the embodiment, (b) is a longitudinal sectional view of the anchor, and (c) is a longitudinal sectional view of the expanded state. (A) is a side view of a nut used for attaching the exfoliation prevention sheet of the embodiment, and (b) is a longitudinal sectional view thereof. (A) is a side view of the plate used for attaching the exfoliation prevention sheet of the embodiment, and (b) is a front view thereof. (A)-(c) is sectional explanatory drawing explaining the construction example of the exfoliation prevention structure by which the exfoliation prevention sheet of embodiment is laid. The perspective explanatory drawing of the exfoliation prevention structure of the 1st example in which the exfoliation prevention sheet of an embodiment was laid. The perspective explanatory view of the exfoliation prevention structure of the 2nd example by which the exfoliation prevention sheet of an embodiment was laid.

[Stripping Prevention Sheet of Embodiment, Stripping Prevention Structure and Construction Method Thereof]
As shown in FIGS. 1 to 3, the anti-stripping sheet 1 of the embodiment according to the present invention has a mesh-like mesh sheet 2 and a lattice-like mesh sheet 2 that is fixed to the mesh sheet 2 by being superposed on one surface of the mesh sheet 2. The shape retention material 3 is provided.

The mesh sheet 2 is composed of a base fabric 21 in which the base yarns are arranged in a mesh shape, for example, the base yarns are vertically and horizontally arranged as warp yarns and weft yarns, and a covering material 22 that covers the surface of the base fabric (see FIG. 7). ). The mesh sheet 2 may have a structure in which the outer periphery of each base yarn is covered with the covering material 22 so that an opening is provided between adjacent base yarns, or the covering material 22 covers one side surface or both sides of the entire base cloth 21. By covering the surfaces in a planar shape, there may be no opening between the adjacent base yarns and the covering material 22 may close the openings. In the mesh sheet 2 of the example of FIG. 7, one side surface opposite to the construction surface of the entire base cloth 21 is planarly covered with the covering material 22.

Appropriate materials and shapes can be used for the material of the mesh sheet 2 and the shapes such as the weaving method and the weaving method within an applicable range. For example, the base yarn of the base cloth 21 is made of high-strength vinylon fiber, and this vinylon fiber is knitted by weft insertion Russell knitting. Further, a vinyl chloride (PVC)-based synthetic resin is formed around the base yarn of the vinylon fiber. The mesh sheet 2 covered by surrounding the covering material 22 or the base yarn of the base fabric 21 is woven with a plain weave or the like as polyester fibers, and a film-like synthetic resin such as a polyvinyl chloride resin film is used as the whole base fabric 21. It is preferable to use the mesh sheet 2 or the like fixed to one side surface or both side surfaces of the above. In addition, it is preferable that the length of the maximum opening of the mesh sheet 2 be smaller than the interval between the vertical bars 32 of the shape retainer 3 described later, from the viewpoint of preventing peeling.

In the shape-retaining material 3, the horizontal rails 31 and the vertical rails 32 are arranged vertically and horizontally, and the interval between the horizontal rails 31 and 31 is formed to be larger than the interval between the vertical rails 32 and 32. Rectangular openings 33 surrounded by 32 are arranged vertically and horizontally. The distance between the horizontal rails 31 and 31 and the distance between the vertical rails 32 and 32 can be appropriately set within the scope of the present invention. The ratio of the intervals between 32 and 32 is preferably in the range of 5:1 to 2:1. In the illustrated example, the distance between the horizontal rails 31 and 31 is 163 mm, and the distance between the vertical rails 32 and 32 is 55 mm. The ratio between the distance between the horizontal rails 31 and 31 and the distance between the vertical rails 32 and 32 is It is about 3:1.

The cross-sectional shapes of the horizontal crosspieces 31 and the vertical crosspieces 32 of the shape-retaining material 3 are appropriate within the scope of the present invention, and are, for example, rectangular in cross-section, circular in cross-section, elliptical in cross-section, and H-shaped in cross-section. It is good. Further, as the material of the shape-retaining material 3, it is possible to use an appropriate material within an applicable range, and for example, FRP is preferable. The material of the shape retention material 3 in the illustrated example is FRP in which glass fibers are impregnated with a thermosetting synthetic resin having alkali resistance. The exfoliation prevention sheet 1 of the embodiment according to the present invention keeps the flexibility of the mesh sheet 2 and the rigidity of the shape-retaining material 3, and is optimal for the construction site depending on the specifications of the mesh sheet 2 and the shape-retaining material 3. Flexibility can be selected.

In the anti-stripping structure in which the anti-stripping sheet 1 of the present embodiment is laid, the anti-stripping sheet 1 is attached to the mounting surface using, for example, the anchor 4, the nut 5, and the plate 6. The anchor 4 of this example is a core rod driving type anchor and, as shown in FIG. 4, is composed of a sleeve-shaped anchor main body 41 and a core rod 42 inserted into the anchor main body 41. A plurality of slits 411 are cut in the axial direction from the tip end of the anchor body 41, and an expansion piece 412 is provided which is divided by slits 411 that are spaced apart in the circumferential direction. A step portion 413 is formed inside the expansion piece 412, and the expansion piece 412 is expanded by driving the core rod 42 and inserting the warhead-shaped tip portion 421 into the step portion 413. A male screw 414 is formed on the outer peripheral surface of the rear portion of the anchor body 41.

As shown in FIG. 5, the nut 5 of this example is a lock nut with a seat. A leaf spring 53 is fitted in the nut 5 on the side opposite to the seat portion 52 of the female screw hole 51, and two leaf springs 53 are fitted in the illustrated example. The female screw hole 51 is formed with a size and pitch that allows it to be screwed into the male screw 414 of the anchor body 41, and the nut 5 is located on the male screw 414 of the anchor body 41 on which the plate 6 is inserted and on the rear side of the plate 6. Are screwed together.

The plate 6 of this example is made of stainless steel or the like, has a flat plate-shaped base 61, and an insertion hole 62 for inserting the anchor 4 is formed in the approximate center of the base 61, as shown in FIG. On both sides in the width direction of the base portion 61, step portions 63 are formed by being bent in a substantially V shape. In other words, a step is formed at both ends of the plate 6 in the width direction so as to float on the side opposite to the anti-stripping sheet 1. The part 63 is formed. The floating height H of the stepped portion 63 from the base portion 61 is substantially corresponding to the thickness of the vertical crosspiece 32 of the shape-retaining material 3. For example, in the plate 6 having a length of 65 mm×a width of 65 mm×a thickness of 2 mm. It is formed with a height of 5 mm or the like. Further, the interval between the step portions 63, 63 at both ends of the plate 6 is set so as to correspond to the interval between the vertical bars 32, 32 of the shape retention material 3.

Then, when constructing a peeling prevention structure for laying the peeling prevention sheet 1, for example, as shown in FIG. 7, the construction surface 12 of the concrete structure 11 is prepared and a primer is applied to form a primer layer 13. The primer layer 13 corresponding to the base layer is formed by applying a primer or the like, such as urethane resin, epoxy resin, or acrylic resin, which is impregnated into the cracks on the construction surface 12 and solidifies. When the primer layer 13 is formed, the surface of the primer layer 13 serves as the attachment surface of the exfoliation prevention sheet 1.

After that, the mesh sheet 2 is arranged on the surface side of the primer layer 13 corresponding to the mounting surface, the peeling prevention sheet 1 is arranged, and the drill 14 penetrates the mesh sheet 2 and the primer layer 13 of the peeling prevention sheet 1. The perforations 15 are formed in the concrete structure 11 at predetermined positions on the construction surface 12 (see FIG. 7A). At this time, since the position where the perforation 15 is formed is the position where the anchor 4 supporting the plate 6 is driven, the step portions 63, 63 on both sides of the plate 6 correspond to the adjacent vertical bars 32, 32. It is also good to form the perforation 15 by passing the drill 14 through the insertion hole 62 of the plate 6 thus arranged.

Next, the plate 6 is externally inserted in advance, and the anchor 4 having the nut 5 screwed thereinto is inserted into the perforation 15 at a position on the rear side of the plate 6 substantially corresponding to the anchor embedding length+the exfoliation prevention sheet thickness+the plate thickness. Then, the core rod 42 is driven by the hammer 16 to expand the expansion piece 412, and the anchor 4 is driven to the concrete structure 11 (see FIGS. 7B and 7C). By driving the anchor 4 penetrating the peeling prevention sheet 1, the peeling prevention sheet 1 is temporarily fixed to the construction surface 12.

After that, the nut 5 screwed into the male screw 414 of the anchor 4 is screwed in, the plate 6 is pressed by the nut 5 toward the mounting surface side or the construction surface 12 side, and the step portions 63, 63 at both ends of the plate 6 Adjacent vertical bars 32, 32 of the shape-retaining material 3 are pressed against the mounting surface side or the construction surface 12 side. As a result, the anti-stripping sheet 1 or the mesh sheet 2 thereof is attached via the plate 6 so as to be pressed against the outer surface of the primer layer 13, and the anti-stripping structure is constructed (see FIG. 7C). In the constructed anti-stripping structure, the anti-stripping sheet 1 or the mesh sheet 2 thereof is laid so as to be substantially along the surface of the primer layer 13 corresponding to the mounting surface and adheres to the outer surface of the primer layer 13 without any gaps. Even when the surface of 13 has a curved raised portion or the like, the peeling prevention sheet 1 or the mesh sheet 2 thereof is provided so as to be in close contact.

The exfoliation prevention sheet 1 of this embodiment or the exfoliation prevention structure using the same can be favorably applied to the construction surface 12 of the concrete structure 11 having a large undulation, and for example, as shown in FIG. It is possible to adapt to the construction surface 12 having a large depression 121. In this case, the peeling-preventing sheet 1 is arranged in the lateral direction in which the vertical bars 32 of the peeling-preventing sheet 1 are easily bent in the traveling direction D in which the recess 121 appears (the direction in which the number of bars extending in the extending direction of the horizontal bars 31 is small. ), and the vertical direction in which the horizontal bars 31 of the exfoliation prevention sheet 1 are arranged in the direction orthogonal to the traveling direction D (the direction in which the number of bars extends in the extending direction of the vertical bars 31) is laid together. It is preferable to construct a peeling prevention structure.

In addition, as shown in FIG. 9, the construction surface 12 is the lining concrete surface of the tunnel T, and when the anti-stripping sheet 1 is laid on the lining concrete surface to construct the anti-stripping structure, the cross rail of the anti-stripping sheet 1 is used. The vertical direction in which 31 is arranged (the direction in which the number of bars extending in the direction in which the vertical bars 31 extend) is aligned with the tunnel circumferential direction C, and the vertical direction 32 in which the peeling prevention sheet 1 is easy to bend is arranged in the horizontal direction ( It is preferable to construct a peeling-preventing structure by laying the peeling-preventing sheet 1 in line with the direction in which the number of crosspieces extending in the extending direction is small) in the tunnel axis direction X. As a result, the anti-stripping sheet 1 can be bent along the undulation appearing on the construction surface 12 in the tunnel axis direction X in the lateral direction in which the easily bendable vertical bars 32 are lined up, and is flexed to the extent that it follows the inner circumferential surface of the tunnel. The peeling-preventing sheet 1 can be bent in the vertical direction in which the horizontal crosspieces 31 that can be folded are arranged so as to be substantially along the surface of the primer layer 13 corresponding to the construction surface 12 or the mounting surface of the tunnel inner peripheral surface.

According to the exfoliation prevention sheet 1 of the present embodiment, the shape-retaining material 3 in which the rectangular openings 33 to be overlapped with the mesh sheet 2 are arranged vertically and horizontally can provide an appropriate shape-retaining property. Further, the interval between the horizontal bars 31 of the shape-retaining material 3 is formed larger than the interval between the vertical bars 32, and the rectangular openings 33 are arranged vertically and horizontally, so that the exfoliation prevention sheet 1 is easily bent in the horizontal direction and easily deformed. The peeling-preventing sheet 1 can be deformed to conform to the irregularities and the curved portion. That is, a peeling-preventing sheet capable of exhibiting excellent conformability to the mounting surface having the unevenness or the curved portion or the construction surface 12, having good shape retention, and facilitating handling during construction. It can be 1.

Further, according to the anti-stripping structure using the anti-stripping sheet 1 of the present embodiment and the method for constructing the anti-stripping sheet 1, it is possible to prevent the primer layer 13 from stripping the construction surface 12 of the concrete structure 11. Further, the shape-preserving material 3 can be pressed by the plate 6 to easily attach the exfoliation prevention sheet 1 to the surface of the primer layer 13 corresponding to the construction surface 12 or the attachment surface. In addition, the mesh sheet 2 can be closely adhered to the primer layer 13 to reliably prevent it from peeling off, and the mesh sheet 2 and the primer layer 13 can be closely adhered to each other and the shape-retaining material 3 is pressed against the construction surface 12 or the mounting surface side. The reinforcing effect can also be obtained.

Further, the vertical bars 32, 32 of the shape-retaining material 3 are pressed to the construction surface 12 side by the step portions 63, 63, so that the peeling-off prevention sheet 1 can be easily formed on the construction surface 12 or the surface of the primer layer 13 corresponding to the mounting surface. Can be attached to. Furthermore, it is easy to move and attach the plate 6 and the stepped portions 63, 63 in the longitudinal direction of the rectangular opening 33, and flexibly adapt to changing and adjusting the placement position of the anchor 4 when attaching the exfoliation prevention sheet 1. can do.

Moreover, when constructing a fall prevention structure by using the lining concrete surface of the tunnel T as the construction surface 12, the lining concrete surface of the tunnel T often has a curved portion, a dented portion, or a protruding portion in the digging direction. However, since the exfoliation prevention sheet 1 is easily bent and deformed in the lateral direction in which the vertical bars 32 of the shape-retaining material 3 are lined up, by laying the exfoliation prevention sheet 1 with the lateral direction aligned with the tunnel axis direction X. It is possible to easily follow a curved portion, a dented portion, or a protruding portion existing in the digging direction on the lining concrete surface. Further, in the vertical direction in which the horizontal crosspieces 31 of the shape-retaining material 3 are lined up, the anti-stripping sheet 1 exhibits appropriate rigidity such that it flexes along the tunnel circumferential direction T, so that it can be handled easily.

[Inclusive Range of Invention Disclosed in the Present Specification]
The invention disclosed in the present specification, in addition to the inventions and embodiments listed as inventions, those in which the partial contents thereof are changed and specified to the other contents disclosed in the present specification within an applicable range. Alternatively, those specified by adding other contents disclosed in this specification to these contents, or those specified as a superordinate concept by deleting these partial contents to the extent that partial operational effects are obtained Include. The invention disclosed in this specification includes the following contents and modifications.

For example, in the exfoliation prevention structure of the above-described embodiment, the vertical bars 32, 32 of the shape retention material 3 of the exfoliation prevention sheet 1 are pressed by the stepped portions 63, 63 of the plate 6 toward the construction surface 12 side. The peeling-preventing structure of the present invention includes any structure that presses the shape member toward the construction surface and attaches the peeling-preventing sheet. Further, the anchors, nuts and plates used in the exfoliation prevention structure of the present invention are appropriate within the scope of the present invention. Further, the anti-stripping structure of the present invention also includes a configuration in which the primer layer is not formed on the construction surface and the anti-stripping sheet is laid with the construction surface of the concrete structure or the like as the mounting surface.

INDUSTRIAL APPLICABILITY The present invention is installed in a part of various structures in which flakes such as tunnels, bridges, and towers may fall, or pillars, beams, girders, walls, bottom surfaces of slabs, and the like. Can be used.

DESCRIPTION OF SYMBOLS 1... Stripping prevention sheet 2... Mesh sheet 21... Base cloth 22... Covering material 3... Shape retention material 31... Horizontal rail 32... Vertical rail 33... Opening 4... Anchor 41... Anchor main body 411... Slit 412... Expansion piece 413... Step Part 414... Male screw 42... Core rod 421... Tip part 5... Nut 51... Female screw hole 52... Seat 53... Leaf spring 6... Plate 61... Base 62... Insertion hole 63... Step 11... Concrete structure 12... Construction surface 121... Indentation 13... Primer layer 14... Drill 15... Drilling 16... Hammer H... Floating height D... Construction progress direction T... Tunnel C... Tunnel circumferential direction X... Tunnel axial direction

Claims (5)

Reticulated mesh sheet,
A lattice-shaped shape retention material that is fixed to the mesh sheet by being stacked on one surface of the mesh sheet,
The distance between the horizontal bars of the shape-retaining material is formed to be larger than the distance between the vertical bars of the shape-retaining material, and the rectangular opening surrounded by the horizontal bars and the vertical bars of the shape-retaining material is vertically and horizontally. The anti-stripping sheet, which is arranged in. The mesh sheet of the exfoliation prevention sheet according to claim 1, is laid so as to be disposed on a mounting surface side of a concrete structure and substantially along the mounting surface,
The plate is pressed to the mounting surface side by a nut screwed to an anchor placed in the concrete structure,
A peeling-preventing structure, wherein the shape-preserving material is pressed against the mounting surface side by the plate to attach the peeling-preventing sheet. The peeling prevention sheet is laid so as to substantially follow the surface of the lining concrete surface of the tunnel or the primer layer formed on the lining concrete surface,
The stripping prevention sheet is arranged such that a vertical direction in which the horizontal bars of the shape-retaining material are arranged is a tunnel circumferential direction, and a horizontal direction in which the vertical bars of the shape-retaining material are arranged is a tunnel axis direction. The peeling prevention structure according to claim 2. Stepped portions that float on the opposite side of the anti-stripping sheet are formed at both ends in the width direction of the plate,
An interval between the step portions at both ends is set corresponding to an interval between the vertical bars of the shape-retaining material,
4. The exfoliation prevention structure according to claim 2 or 3, wherein the vertical bars of the shape retainer are pressed to the attachment surface side by the step portions at both ends of the plate to attach the exfoliation prevention sheet. .. It is a construction method of the exfoliation prevention structure according to any one of claims 2 to 4,
Forming a primer layer on a construction surface of a concrete structure, arranging the exfoliation prevention sheet, and forming perforations in the concrete structure so as to penetrate the mesh sheet and the primer layer of the exfoliation prevention sheet. Process,
A second step in which the plate is externally inserted, the anchor in which the nut is screwed to the rear side of the plate is inserted into the perforation, and the anchor is driven into a concrete structure;
A method for constructing a peeling-preventing structure, comprising a third step of screwing in the nut and pressing the shape retaining material against the mounting surface side by the plate.

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