Peeling prevention structure

Abstract

To prevent a holding metal fitting and a diameter expansion anchor for attaching a peeling prevention sheet from falling off a concrete structure.SOLUTION: A peeling prevention sheet 2 is laid so as to substantially follow a mounting surface 101 of a concrete structure 100. A holding metal fitting 1 having a front plate 11 and a back plate 12 is provided so as to sandwich the vicinity of both edges in the width direction of the peeling prevention sheet 2 with the back plate 12 facing the mounting surface 101. Each of vertical shape retaining members 221 at the edges in the width direction of the peeling prevention sheet 2 is accommodated in a protruding stepped portion 14 of the front plate 11. A diameter expansion anchor 3 is cast into the concrete structure 100 through a front through hole 16 and a back through hole 17. The holding metal fitting 1 is pressed toward the mounting surface 101 by a nut 4 screwed onto the diameter expansion anchor 3. The vertical shape retaining member 221 is pressed toward the mounting surface 101 by the holding metal fitting 1, and the peeling prevention sheet 2 is attached.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a spalling prevention structure that prevents the falling of flakes peeled off from a concrete structure. [Background technology]

[0002] Conventionally, a structure for preventing the falling of flakes peeled off from the surface of aged concrete of a concrete structure due to deterioration over time is disclosed in Patent Document 1. Peel It has a fall prevention structure. Peel The fall prevention structure is a mesh sheet of a fall prevention sheet, which is overlaid on one side of a net-like mesh sheet and has a lattice-shaped retaining body fixed to it, placed on the mounting surface side of the concrete structure and laid so that it roughly follows the mounting surface, and anchors inserted into the plate are driven into the concrete structure, and a flat plate is pressed against the mounting surface side with a nut screwed onto the anchor, and the pressed plate Peel The anti-fall sheet is attached by pressing the shape retaining body of the anti-fall sheet against the attachment surface side. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-111954 Summary of the Invention [Problem to be solved by the invention]

[0004] However, to prevent spalling of concrete structures Peel Since fall prevention structures are usually installed on aged and deteriorated concrete, Peel Like a fall prevention structure, a flat plate is attached to the deteriorated concrete with anchors and nuts. Peel In a configuration in which the anchor is pressed down against a fall prevention sheet, there is a risk that the cast anchor may come out of the deteriorated concrete and the flat plate may fall off along with the anchor.

[0005] The present invention has been proposed in view of the above-mentioned problems, and is a method of laying a concrete structure so as to substantially follow the concrete structure. Peel A fall prevention structure that can prevent the retaining metal fittings and expanding anchors that attach the fall prevention sheet from falling off the concrete structure, and Peel The object is to provide a clamp used in a fall prevention structure. [Means for solving the problem]

[0006] The present invention Peel The fall prevention structure is provided with a back panel folded back from the front panel at a folding portion, a protruding step portion formed adjacent to the folding portion of the front panel, a clamp provided at a position where the front through-hole of the front panel and the back through-hole of the back panel correspond to each other, so that the expanded diameter anchor in the expanded state cannot slip out, and a peeling prevention sheet in which a lattice-shaped shape retainer is overlaid and fixed to a net-like mesh sheet, and vertical shape retainers of the shape retainer are respectively provided along both end edges in the width direction, and the peeling prevention sheet is laid so as to substantially follow the mounting surface of the concrete structure, and the clamp is arranged so that the back panel faces the mounting surface side, and the Peel The anti-fall sheet is characterized in that it is arranged to clamp the vicinity of both widthwise ends of the sheet, and each of the vertical retaining members at the widthwise ends is accommodated in the protruding step portion, the expandable anchor is driven into the concrete structure through the front through hole and the back through hole of the clamp, the clamp is pressed toward the mounting surface with a nut screwed onto the expandable anchor, and the vertical retaining members at the ends are pressed toward the mounting surface by the clamp, thereby attaching the anti-fall sheet. According to this, the expanded diameter anchor that has been installed in the concrete structure cannot come out of the clamping bracket, and the clamping bracket Peel By providing the anchor in a generally U-shaped manner near the edge of the fall prevention sheet in the width direction, it is possible to prevent the expanded anchor in the expanded state from slipping out of the concrete structure and falling together with the retaining metal fitting. PeelThis prevents the retaining metal fittings and expanding anchors that attach the fall prevention sheet from falling off the concrete structure. Peel The vertical retaining material at the edge of the fall prevention sheet is wrapped in a roughly U-shape and pressed against the mounting surface, allowing it to be attached to the mounting surface of the concrete structure. Peel The fall prevention sheet can be easily attached, Peel The installation state of the fall prevention sheet can be made more stable.

[0007] The present invention Peel The fall prevention structure has another protruding step formed around the end of the front plate on the opposite side of the folded portion of the clamping bracket, Peel Another vertical shape-retaining material is provided at a predetermined interval inside the vertical shape-retaining material at the edge of the fall prevention sheet, and the other vertical shape-retaining material is pressed against the other protruding step portion and accommodated. According to this, at another protruding step around the edge of the front plate of the clamp, Peel By pressing another vertical retaining material on the inside of the fall prevention sheet, Peel The attachment state of the fall prevention sheet can be made even more stable.

[0008] The present invention Peel The fall prevention structure is such that the front through-hole of the clamping bracket is a round hole and the rear through-hole is a Peel The hole is a long hole that is long in the width direction of the fall prevention sheet, and the diameter of the front through hole and the minor diameter of the back through hole are formed smaller than the outer diameter of the expandable anchor when expanded. According to this, when inserting the expansion anchor into the clamping bracket, it is not visible from the front side. Peel The tolerance for misalignment of the rear through-hole located on the rear side of the fall prevention sheet can be increased, facilitating the insertion of the expandable anchor into the front through-hole and the rear through-hole. Also, by making the rear through-hole an elongated hole with its minor diameter smaller than the outer diameter of the expandable anchor when expanded, it is possible to ensure a configuration in which the expandable anchor cannot slip out of the expanded state of the rear plate.

[0009] The present invention PeelThe fall prevention structure is as described above. Peel The shape retaining body of the fall prevention sheet is arranged and fixed at corresponding positions on both sides of the mesh sheet, and the protruding step portion is formed at a height at which the vertical shape retaining materials on the edge provided on both sides are accommodated in a pressed state. According to this, by arranging the shape retaining bodies at corresponding positions on both sides of the mesh sheet, Peel The rigidity of the fall prevention sheet can be increased to a more appropriate level, allowing it to exhibit good shape retention and making it easier to handle during installation.

[0010] The clamp of the present invention is a mesh sheet in which a lattice-shaped shape retainer is overlaid and fixed, and the anti-peeling sheet, which has vertical shape retainers of the shape retainer provided along both end edges in the width direction, is laid so as to roughly follow the mounting surface of the concrete structure. Peel The fall prevention structure Peel The anti-fall sheet is provided so as to sandwich the vicinity of both end edges in the width direction thereof. Peel A clamp used for attaching a fall prevention sheet, the clamp having a back plate folded back at a folding portion from a front plate and arranged on the attachment surface side, Peel A protruding step portion for accommodating the vertical shape retaining material at the widthwise edge of the fall prevention sheet in a pressed state is formed adjacent to the folded portion of the front plate, Peel Another protruding step portion that accommodates another vertical shape retaining material in a pressed state, which is provided at a predetermined interval inside the vertical shape retaining material at the edge of the fall prevention sheet, is formed at the end of the front plate on the opposite side from the folded-back portion, and the front through hole of the front plate and the rear through hole of the rear plate are provided at corresponding positions, and the front through hole is a round hole, and the rear through hole is Peel The anti-fall sheet is characterized in that the diameter of the front through hole and the minor diameter of the rear through hole are smaller than the outer diameter of the expandable anchor when expanded, which is driven into the concrete structure through the front through hole and the rear through hole. According to this, by forming the diameter of the front through hole and the minor diameter of the back through hole of the clamping member to be smaller than the outer diameter of the expanded diameter anchor to be driven, it is possible to prevent the expanded diameter anchor driven into the concrete structure from slipping out of the clamping member. Peel The fall prevention sheet is provided in a generally U-shaped manner near the edge of the sheet in the width direction, Peel The structure in which the protruding step presses the vertical shape retaining members at the widthwise edges of the fall prevention sheet can prevent the expanded anchor in the expanded state from slipping out of the concrete structure and falling together with the retaining metal fittings. Peel This prevents the retaining metal fittings and expanding anchors that attach the fall prevention sheet from falling off the concrete structure. Peel The vertical retaining material at the edge of the fall prevention sheet is wrapped in a roughly U-shape and pressed against the mounting surface, so that it fits securely to the mounting surface of the concrete structure. Peel The fall prevention sheet can be easily attached, Peel The installation state of the fall prevention sheet can be made more stable. In addition, the other protruding step part at the end of the front plate of the clamp Peel By pressing another vertical retaining material on the inside of the fall prevention sheet, Peel This makes it possible to further stabilize the installation of the fall prevention sheet. In addition, when inserting the expansion anchor into the retaining bracket, it is not visible from the front side. Peel The tolerance for misalignment of the rear through-hole located on the rear side of the fall prevention sheet can be increased, making it easier to insert the expandable anchor into the front through-hole and rear through-hole. [Effects of the Invention]

[0011] According to the present invention, the concrete structure is laid so as to substantially follow the concrete structure. Peel The clamps and expansion anchors that attach the fall prevention sheet can be prevented from falling off the concrete structure. [Brief explanation of the drawings]

[0012]

Figure 1

Figure 2

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Figure 5

Figure 6

Figure 7

Figure 8

[0013] [Embodiment Peel Fall prevention structure] In an embodiment according to the present invention Peel The fall prevention structure is installed on deteriorated concrete of a concrete structure 100, such as deteriorated lining concrete of a tunnel T, and as shown in Figures 1 to 4, it comprises a clip-shaped clamp 1 made of a metal material such as stainless steel, Peel It is equipped with a fall prevention sheet 2, an expandable anchor 3, and a nut 4.

[0014] 1 to 6, the clamp 1 comprises a front panel 11 having steps around both widthwise edges, and a flat rear panel 12, with the rear panel 12 being provided so as to be folded back from the front panel 11 at a fold-back portion 13 that is curved and elastically deformable and has an arc-like shape in cross section. A protruding step portion 14 is formed on the front panel 11 adjacent to the fold-back portion 13, and another protruding step portion 15 is formed around the end of the front panel 11 opposite the fold-back portion 13, so that the front panel 11 is formed in a dish-like shape with a rim in cross section. In other words, the protruding step portion 14 and another protruding step portion 15 are formed on both widthwise sides of a flat base portion 111 of the front panel 11 so as to rise on the side opposite the back panel 12. The protruding step portions 14, 15 are each formed over the entire length of the front panel 11 in the longitudinal direction, and the distance between the protruding step portion 14 and another protruding step portion 15 is approximately equivalent to the distance between the vertical shape retaining material 221 at the end edge and another vertical shape retaining material 222 described later.

[0015] A front through-hole 16 and a rear through-hole 17, through which the expandable anchor 3 is inserted, are provided at corresponding positions approximately at the center of the flat base 111 of the front plate 11 and the center of the rear plate 12 of the clamping fixture 1. In the clamping fixture 1 of this embodiment, the front through-hole 16 is formed as a round hole, and the diameter of the round front through-hole 16 is formed smaller than the outer diameter of the expandable anchor 3 when expanded, and the rear through-hole 17 is formed as a round hole. Peel The rear through-holes 17 are elongated holes that are long in the width direction of the fall prevention sheet 2, and the minor diameter of the elongated rear through-holes 17 is smaller than the outer diameter of the expandable anchors 3 when expanded. In other words, the front through-holes 16 in the front panel 11 and the rear through-holes 17 in the rear panel 12 are each formed so that the expandable anchors in their expanded state cannot slip out. The diameter of the round front through-holes 16 and the minor diameter of the elongated rear through-holes 17 are each formed to be 9 mm, for example.

[0016] PeelThe fall prevention sheet 2 is composed of a net-like mesh sheet 21 and a lattice-like shape retaining body 22 that is overlaid on and fixed to the mesh sheet 21, and the shape retaining body 22 is arranged and fixed at corresponding positions on both sides of the mesh sheet 21. The material and structure of the mesh sheet 21 and the shape retaining body 22 are appropriate within an applicable range, and for example, it is preferable to use for the mesh sheet 21 a base fabric made of high-strength aramid fiber, the surface of the base yarn of the high-strength aramid fiber being covered with an acrylic resin film and knitted in a weft-inserted raschel pattern, and it is also preferable to use for the shape retaining body 22 a material made of GFRP, which is glass fiber impregnated with an alkali-resistant thermosetting synthetic resin.

[0017] The peeling prevention sheet 2 is formed in a rectangular shape with a width of, for example, 330 mm, and the vertical shape retaining members 221 of the shape retaining body 22 are provided along both edges in the width direction, and another vertical shape retaining member 222 is provided inside the vertical shape retaining member 221 at the edge at a predetermined interval. Peel In the fall prevention sheet 2, vertical shape retaining members 221-221 at the edges are arranged and fixed at corresponding positions on both sides of the mesh sheet 21, and another vertical shape retaining member 222 is arranged and fixed at corresponding positions on both sides of the mesh sheet 21.

[0018] In this embodiment Peel When the clamp 1 is installed in the fall prevention structure, the vertical shape retainers 221-221 on the edges provided on both sides and the mesh sheet 21 are arranged between the protruding step portion 14 and the back panel 12, and other vertical shape retainers 222-222 on both sides and the mesh sheet 21 are arranged between the protruding step portion 15 and the back panel 12. In other words, the protruding step portion 14 is formed at a height that accommodates the vertical shape retainers 221-221 on the edges provided on both sides and the mesh sheet 21, and another protruding step portion 15 is formed at a height that accommodates the other vertical shape retainers 222-222 on both sides and the mesh sheet 21.

[0019] The expansion anchor 3 in this embodiment is a mandrel-driven anchor, and as shown in Figure 7, is composed of a sleeve-shaped anchor body 31 and a mandrel 32 inserted into the anchor body 31. The anchor body 31 has multiple slits 311 cut in the axial direction from the tip, and is provided with expansion pieces 312 divided by the slits 311 spaced apart in the circumferential direction. An inclined step 313 is formed on the inside of the expansion piece 312, and when the mandrel 32 is driven in, the bullet-head-shaped tip 321 enters the step 313 toward the tip, causing the expansion piece 312 to expand.

[0020] A male thread 314 is formed on the outer peripheral surface of the rear part of the anchor body 31, and a sawtooth portion 322 is formed by serration processing on the outer peripheral surface near the rear end of the mandrel 32. After the diameter of the expandable anchor 3 is expanded, frictional contact between the sawtooth portion 322 and the inner peripheral surface of the anchor body 31 prevents the mandrel 32 from slipping out of the anchor body 31.

[0021] The nut 4 in this embodiment is a locking nut with a seat, as shown in Fig. 7. A leaf spring 43 is fitted into the nut 4 on the side opposite to the seat 42 of the female thread hole 41, and in the illustrated example, two leaf springs 43 are fitted in. The female thread hole 41 is formed with a size and pitch that allows it to be threaded onto the male thread 314 of the anchor body 31, and the nut 4 is positioned behind the front plate 11 of the presser fitting 1 and is threaded onto the male thread 314 of the anchor body 31 onto which the presser fitting 1 is inserted.

[0022] When constructing the spalling prevention structure of this embodiment, as shown in Figure 1, for example, the spalling prevention sheet 2 is placed and laid on the mounting surface 101 of the concrete structure 100 so as to cover the construction joint portion 103 of the lining concrete 102 of the tunnel T. The spalling prevention sheet 2 is laid so as to roughly follow the mounting surface 101 of the concrete structure 100, and in the example of Figure 1, it is laid so as to roughly follow the inner surface of the lining concrete 102 of the tunnel T. PeelAfter the fall prevention sheet 2 is placed, holes 104 are formed with a drill at predetermined positions on the mounting surface 101 of the concrete structure 100 so as to penetrate the mesh sheet 21 of the fall prevention sheet 2 (see FIG. 2).

[0023] Next, the clamp 1 is placed with the back panel 12 facing the mounting surface 101. Peel The fall prevention sheet 2 is provided so as to sandwich both end edges in the width direction in a generally U-shape (see Figs. 2 to 5). At this time, the clamp 1 is arranged so that the front through-hole 16 and the rear through-hole 17 are positioned to correspond to the perforations 104, and the protruding step 14 of the clamp 1 is Peel The vertical shape retaining members 221·221 at the widthwise edge of the fall prevention sheet 2 are arranged to be accommodated, and the protruding step portion 15 of the clamping bracket 1 is Peel The vertical shape retaining members 222·222 are arranged so as to be housed inward of the fall prevention sheet 2. Peel A plurality of such markers are provided on each edge of the fall prevention sheet 2 at predetermined intervals in the longitudinal direction.

[0024] Then, the expandable anchor 3 is inserted into the drilled hole 104 by communicating the front through-hole 16 with the back through-hole 17 of each clamping member 1, the core rod 32 is driven in with a hammer 5 to expand the expansion piece 312, and the expandable anchor 3 is cast into the concrete structure 100 (see Figures 2, 3, and 8). By casting the expandable anchor 3 that penetrates the peeling prevention sheet 2 in an expanded state, the clamping member 1 and the peeling prevention sheet 2 are temporarily fixed to the mounting surface 101.

[0025] 2 and 3, the nut 4 is screwed onto the male thread 314 of the expansion anchor 3 and tightened, the nut 4 presses the clamp 1 toward the mounting surface 101, and the pressed clamp 1 presses the shape retainer 22 toward the mounting surface 101, thereby attaching the anti-fall sheet 2 to the concrete structure 100. In other words, the projecting step portion 14 of the clamp 1 and the back plate 12 press the vertical shape retainers 221 and 221 at the edge and the mesh sheet 21 so as to sandwich them, and the projecting step portion 15 of the clamp 1 and the back plate 12 press the other vertical shape retainers 222 and 222 and the mesh sheet 21 so as to sandwich them, and in this statePeel The fall prevention sheet 2 is attached to the concrete structure 100, and a fall prevention structure is constructed.

[0026] In this embodiment Peel According to the fall prevention structure, the expanded diameter anchor 3 driven into the concrete structure 100 cannot come out of the clamp 1, and the clamp 1 is Peel By providing the fall prevention sheet 2 so as to be sandwiched in a generally U-shape near the edge in the width direction, it is possible to prevent the expanded diameter anchor 3 in the expanded state from slipping out of the concrete structure 100 and falling together with the retaining metal fitting 1. In other words, the expanded diameter anchor 3 is laid so as to be generally along the concrete structure 100. Peel The clamp 1 and the expandable anchor 3 that attach the fall prevention sheet 2 can be prevented from falling off the concrete structure 100.

[0027] In addition, the protruding step portion 14 of the clamping bracket 1 Peel The vertical shape retaining members 221 at the edge of the fall prevention sheet 2 are wrapped in a substantially U-shape and pressed against the mounting surface 101, thereby attaching the sheet to the mounting surface 101 of the concrete structure 100. Peel The fall prevention sheet 2 can be easily attached, and Peel The attachment state of the fall prevention sheet 2 can be made more stable. Furthermore, the other protruding step portion 15 around the end of the front plate 11 of the clamping bracket 1 Peel By pressing the other vertical shape retaining members 222·222 on the inner side of the fall prevention sheet 2, Peel This makes it possible to further stabilize the attachment state of the fall prevention sheet 2.

[0028] The front through-hole 16 of the clamping bracket 1 is a round hole, and the rear through-hole 17 is a Peel The holes are elongated in the width direction of the fall prevention sheet 2, and the diameter of the front through-hole 16 and the minor diameter of the back through-hole 17 are formed smaller than the outer diameter of the expandable anchor 3 when expanded, so that when the expandable anchor 3 is inserted into the clamping fixture 1, it cannot be seen from the front side. PeelThe tolerance for positional misalignment of the rear through-hole 17 located on the rear side of the fall prevention sheet 2 can be increased, facilitating the insertion of the expandable anchor 3 into the front through-hole 16 and the rear through-hole 17. Furthermore, by making the rear through-hole 17 an elongated hole with its minor diameter smaller than the outer diameter of the expandable anchor 3 when expanded, it is possible to ensure a configuration in which the expandable anchor 3 cannot slip out of the rear plate 12 when it is in the expanded state.

[0029] In addition, by arranging the shape retaining bodies 22 at corresponding positions on both sides of the mesh sheet 21, such as the vertical shape retaining members 221·221 at the edges and other vertical shape retaining members 222·222, Peel The rigidity of the fall prevention sheet 1 can be increased to a more appropriate level, allowing it to exhibit good shape retention and making it easier to handle during installation.

[0030] [Scope of the invention disclosed herein] The inventions disclosed in this specification include, in addition to the individual inventions and embodiments listed as inventions, those specified by changing partial contents of these to other contents disclosed in this specification, those specified by adding other contents disclosed in this specification to these contents, or those specified by deleting partial contents of these to the extent that partial effects are obtained and creating a generic concept.The inventions disclosed in this specification also include the following contents and modifications.

[0031] For example, in the above embodiment Peel In the fall prevention structure, an expandable anchor 3 of the core rod driving type anchor was used, but the expandable anchor of the present invention can be any appropriate type within the applicable range, such as a wedge type anchor. Preferably, from the standpoint of ease of installation, the expandable anchor of the present invention has a male thread formed on the outer circumferential surface of the anchor body, and the outer diameter of the anchor body and the thread diameter (nominal diameter) of the male thread are approximately the same.

[0032] In addition, in the above embodiment Peel In the fall prevention structure, the shape retaining body 22 is fixed to both sides of the mesh sheet 21, but the present invention can be applied to a fall prevention sheet in which the shape retaining body is fixed to only one side of the mesh sheet. PeelIt is also possible to construct a fall prevention structure.

[0033] In addition, the present invention Peel The fall prevention structure is designed to cover the joint 103 of the lining concrete 102 of the tunnel T, which tends to be brittle. Peel It is particularly preferable to lay a fall prevention sheet and construct it, but it is also preferable to lay it in an appropriate area of ​​the concrete structure, such as an area other than the joint area 103 of the lining concrete 102. Peel It is possible to construct it by laying down a fall prevention sheet. Peel The fall prevention sheets 2 are laid side by side to Peel It is also possible to build a fall prevention structure. [Industrial Applicability]

[0034] The present invention can be installed and used in various concrete structures such as tunnels, bridges, towers, etc., where there is a risk of falling debris, or in parts of various concrete structures such as columns, beams, girders, walls, and the undersides of slabs, where there is a risk of falling debris. [Explanation of symbols]

[0035] 1...Pressing bracket 11...Front panel 111...Base 12...Rear panel 13...Folded portion 14...Protruding step portion 15...Another protruding step portion 16...Front through hole 17...Rear through hole 2... Peel Fall prevention sheet 21...Mesh sheet 22...Shape retaining body 221...Vertical shape retaining material at edge 222...Another vertical shape retaining material 3...Expansion anchor 31...Anchor body 311...Slit 312...Expansion piece 313...Step portion 314...Male thread 32...Core rod 321...Tip portion 322...Saw-tooth portion 4...Nut 41...Female thread hole 42...Seat portion 43...Leaf spring 5...Hammer 100...Concrete structure 101...Mounting surface 102...Lining concrete 103...Construction joint portion 104...Drilling T...Tunnel

Claims

1. a rear plate provided by folding back from the front plate at a folding back portion, a protruding step portion formed adjacent to the folding back portion of the front plate, and a clamp provided at a position where a front through-hole of the front plate and a rear through-hole of the rear plate correspond to each other, so that the expanded anchor in an expanded state cannot slip out; A peeling prevention sheet in which a lattice-shaped shape retaining body is overlaid and fixed on a net-shaped mesh sheet, and vertical shape retaining members of the shape retaining body are provided along both end edges in the width direction, The anti-fall sheet is laid so as to substantially follow the mounting surface of the concrete structure, The clamping members are provided so as to sandwich the vicinity of both end edges in the width direction of the anti-peeling sheet with the back panel on the mounting surface side, and each of the vertical shape retaining members at the end edges in the width direction is accommodated in the protruding step portion, The expandable anchor is driven into the concrete structure through the front through-hole and the rear through-hole of the clamping bracket, A peeling prevention structure characterized in that the clamping member is pressed toward the mounting surface by a nut threaded onto the expansion anchor, and the clamping member presses the vertical shape-retaining material at the end edge toward the mounting surface, thereby attaching the peeling prevention sheet.

2. Another protruding step portion is formed around the end portion of the front plate opposite to the folded portion of the pressing metal fitting, Another vertical shape retaining material is provided at a predetermined interval inside the vertical shape retaining material at the edge of the peel-off prevention sheet, The peeling prevention structure according to claim 1, wherein the other vertical shape retaining material is pressed and accommodated in the other protruding step portion.

3. The front through-hole of the pressing metal fitting is a round hole, and the rear through-hole is an elongated hole that is long in the width direction of the peel-preventing sheet, 2. The structure for preventing separation according to claim 1, wherein the diameter of the front through hole and the minor diameter of the rear through hole are smaller than the outer diameter of the expandable anchor when expanded.

4. The shape-retaining members of the anti-exfoliation sheet are arranged and fixed at corresponding positions on both sides of the mesh sheet, A peeling prevention structure as described in any one of claims 1 to 3, characterized in that the protruding step portion is formed at a height at which the vertical shape-retaining materials on the edge portions provided on both sides are accommodated in a pressed state.

5. A peeling prevention structure in which a lattice-shaped shape retaining body is overlaid and fixed on a net-like mesh sheet, and vertical shape retaining members of the shape retaining body are provided along both end edges in the width direction, and the peeling prevention sheet is laid so as to approximately follow the mounting surface of a concrete structure, and a clamping member is provided so as to clamp the vicinity of both end edges in the width direction of the peeling prevention sheet and used to attach the peeling prevention sheet, a back plate is provided that is folded back from the front plate at a folding portion and is disposed on the mounting surface side; A protruding step portion that accommodates the vertical shape retaining material at the widthwise edge of the anti-peeling sheet in a pressed state is formed adjacent to the folded portion of the front plate, Another protruding step portion is formed on the end of the front panel opposite to the folded portion, and the protruding step portion accommodates another vertical shape retaining material provided at a predetermined interval inside the vertical shape retaining material at the end edge of the peel-off prevention sheet in a pressed state, a front through-hole in the front plate and a rear through-hole in the rear plate are provided at corresponding positions; The front through-hole is a round hole, and the rear through-hole is an elongated hole that is long in the width direction of the peel-off prevention sheet, A clamp characterized in that the diameter of the front through hole and the minor diameter of the rear through hole are formed smaller than the outer diameter of the expandable anchor when expanded, which is driven into a concrete structure through the front through hole and the rear through hole.

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