JP7171147B2 - Structural spalling prevention structure - Google Patents

Description

Article 30, Paragraph 2 of the Patent Law applies Technology Presentation (Date: March 13, 2018, Venue: 1-19 Okuwa, Kazo City, Saitama Prefecture KFC Technical Research Institute)

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spalling prevention structure for a structure that prevents a deteriorated surface layer portion of a concrete frame from spalling from a structure such as a tunnel or a bridge.

Conventionally, as a structure to prevent the deteriorated surface layer of the concrete frame from falling off from structures such as tunnels and bridges, a mesh-like anti-spinning net is placed on the surface of the structure, and the structure is attached to the anti-spinning net. A structure is known in which a strip-shaped holding plate is placed on the opposite side, an anchor bolt is inserted through the holding plate and the anti-spinning net, driven into the structure, and held down by the holding plate to fix the anti-peeling net to the surface of the structure. there is This structure has the advantage that the surface of the structure can be visually observed even after installation, and the state of the surface of the structure can be confirmed and inspected (Patent Document 1 (paragraphs [0001], [0004] ], [0020], [0027], FIG. 3), Patent Document 2 (see paragraphs [0002], [0015], FIGS. 1 to 4)).

Japanese Patent Application Laid-Open No. 2004-293150 Japanese Patent Application Laid-Open No. 2007-120231

However, in the above-mentioned structure in which the anti-peeling net is fixed to the surface of the structure by pressing it with a belt-shaped pressing plate, the anti-peeling net is only pressed by the strip-shaped pressing plate, so a load is applied to the anti-peeling net. As a result, the load is concentrated on the threads of the anti-slip net that are engaged with the anchor bolts and rivets, and there is a risk that the threads at that portion will be cut. In addition, the holding plate and the anti-peeling net may be misaligned at the time of installation, or may be displaced from the installed position later, causing the anti-peeling net to loosen or hang down. Such slackness or sagging of the anti-slip net will cause the anti-slip net to separate from the surface of the building frame and allow it to fall off. It also becomes an obstacle to visual inspection of the surface of the structure.

The present invention is proposed in view of the above problems, and prevents local cutting of threads due to local concentration of load on the peeling prevention net, furthermore, prevents displacement from the installation position, and prevents the peeling prevention net. It eliminates the slack and sagging of the structure, stably brings the anti-spinning net close to the surface of the structure, prevents the spalling of a large load with high stability, and makes it possible to perform a good visual inspection. An object of the present invention is to provide a structure for preventing the structure from falling off.

The anti-stripping structure for a structure according to the present invention comprises a mesh-like anti-stripping net arranged substantially closely along the surface of the structure, and the anti-stripping net provided on the opposite side of the structure, A strip plate for fixing the anti-peeling net and an anchor member for fixing the strip plate to the structure are provided, and a plurality of hook-like projections are formed at intervals on the side of the stripping-preventing net of the strip plate, A hook-shaped projection is provided so as to enter the mesh of the peeling prevention net.
According to this, since the hook-shaped projections of the strip plate enter the mesh of the stripping-preventing net, the load applied to the stripping-preventing net is evenly distributed along the strip, so that the yarns constituting the net can be localized. It does not cut and can withstand heavy load spalling. In addition, since the hook-shaped projections enter the mesh, it is possible to fix the positional relationship between the strip plate and the peeling prevention net with high stability, and it is possible to reliably prevent the peeling prevention net from being displaced from the installation position. . Therefore, slack and sagging of the anti-peeling net can be eliminated, and the anti-peeling net can be brought into almost close contact with the surface of the structure and can be stably installed along the surface of the structure. can. In addition, since the anti-spinning net can be prevented from slipping, loosening, and sagging, and can be stably brought into close contact with the surface of the structure, it is possible to perform good visual inspection of the surface of the structure. becomes.

The structure of the present invention is characterized in that the hook-shaped projection of the strip plate is formed by cutting and raising the strip plate made of metal.
According to this, by forming the hook-shaped protrusions by cutting and raising the strip plate, a separate member used as the hook-shaped protrusions becomes unnecessary, and a plurality of hooks can be formed by a simple process such as pressing the strip plate. shaped protrusions can be formed. Therefore, it is possible to reduce the manufacturing cost of the strip plate and the construction cost of the spalling prevention structure.

In the spalling prevention structure for a structure of the present invention, an insertion hole for the anchor member is formed in the central portion of the band plate in the width direction, and the regions on both sides of the central portion are spaced apart in the longitudinal direction of the band plate. A plurality of hook-shaped projections are arranged in rows.
According to this, a plurality of hook-shaped projections arranged in rows in the longitudinal direction on both sides in the width direction of the strip are inserted into the mesh of the anti-spinning net, thereby dispersing and supporting the load on both sides of the portion fixed by the anchor member. At the same time, the positional relationship of the anti-peeling net can be fixed on both sides, and the effect of dispersing the load and preventing the positional deviation of the anti-peeling net can be exhibited with higher stability. In addition, a plurality of hook-shaped projections arranged in rows on both side regions in the width direction of the strip are pressed against the surface of the structure so as to be substantially in contact with the surface of the structure, and the strip is placed in the width direction as a spalling prevention net or the like. It can be installed and fixed in a state of being substantially parallel to the surface of the structure, and the stability of the installation state of the strip plate can be enhanced.

The anti-slip structure of the structure of the present invention is characterized in that the anti-slip net is a PVC-coated PET mesh.
According to this, it is possible to increase the rigidity of the anti-peeling net and more reliably prevent loosening and sagging of the anti-peeling net. Furthermore, the PVC-coated PET mesh has a predetermined rigidity and a predetermined flexibility, and can follow along the surface of a curved structure such as the inner peripheral surface of a tunnel. , and a peeling prevention net having excellent versatility can be obtained. In addition, by using a PVC-coated PET mesh for the anti-peeling net, the weather resistance, water resistance, and durability of the anti-peeling net can be improved, and the durability of the anti-peeling structure can be enhanced. Furthermore, the PVC-coated PET mesh can be cut to the required size on site and used, and can be used even when the surface shape of the structure is complicated, and has high adaptability to the construction site.

In the structure for preventing the structure from coming off according to the present invention, the anchor member is a resin injection type expansion anchor, the expansion portion of the expansion anchor is expanded, and the gap between the expansion anchors is filled with a cured resin. The expansion anchor is fixed to the structure in the state of being fixed, and the band plate is urged toward the structure by a flange provided near the rear end of the expansion anchor. and
According to this, the anchor member and the band plate are strongly and stably attached to the back of the structure by the expansion anchor of the resin injection type. It can be fixed to the surface, and the stability of the installation state of the peeling prevention net can be further improved. In addition, even if there are signs of deterioration on the surface layer of the concrete frame and there is unevenness in the mechanical fixing force of the anchor, the anchor fixing force can be stably secured by injecting the resin. Furthermore, by urging the band plate with the flange near the rear end of the expansion anchor, there is no need to provide a nut at the rear end of the expansion anchor, and the risk of the nut falling off can be eliminated.

According to the peeling prevention structure of the structure of the present invention, the yarn is prevented from being locally cut due to the local concentration of the load of the peeling prevention net, and furthermore, the displacement from the installation position is reliably prevented, and the peeling prevention It eliminates the slack and sagging of the net, stably brings the anti-spill net into close contact with the surface of the structure, and can prevent the spalling of a large load with high stability, as well as good visual inspection of the surface of the structure. It can be performed.

BRIEF DESCRIPTION OF THE DRAWINGS The perspective explanatory drawing which shows the state which installed the peeling prevention structure of the structure of embodiment by this invention in the tunnel inner wall. FIG. 2 is a partial front view of the structure for preventing the structure from falling off according to the embodiment; FIG. 2 is a partial vertical cross-sectional view of the structure for preventing the structure from falling off according to the embodiment; FIG. 2 is a schematic perspective view of a state in which the anti-peeling net in the anti-peeling structure for the structure of the embodiment is arranged along the surface of the structure. FIG. 3 is a schematic perspective view of the structure viewed from the side of the structure with a band plate in contact with the detachment prevention net in the detachment prevention structure for the structure according to the embodiment. (a) is a partial perspective view of a peeling prevention net in the structure's peeling prevention structure of the embodiment, and (b) is a partial perspective view of a band plate in the structure's peeling prevention structure of the embodiment. Explanatory drawing which shows the modification of the attachment state of the peeling prevention net and strip plate in this invention.

[Peeling prevention structure of the structure of the embodiment]
The spalling prevention structure of the structure according to the embodiment of the present invention is provided for structures such as tunnels and bridges, and is preferably provided for concrete structures made of concrete. In the example of FIG. 1, the spalling prevention structure of the structure of this embodiment is installed using the concrete skeleton 100 of the tunnel as the structure.

In the spalling prevention structure of the structure of the present embodiment, as shown in FIGS. of peeling prevention net 1 is arranged. The anti-peeling net 1 is stretched along the surface of the concrete frame 100, and a plurality of anti-peeling nets 1 are arranged adjacently or in close proximity, or the ends of the adjacent anti-peeling nets 1 are overlapped. They are arranged side by side in the axial direction of the tunnel. When the spalling prevention net 1 is provided on the inner peripheral surface of the concrete frame 100 of the tunnel, it is preferably provided at least from the top end of the upper half of the tunnel to the side wall.

The spalling prevention net 1 is formed in a mesh or grid pattern, and can be used as long as the mesh 11 is provided between the threads 12 at regular intervals so as to prevent the surface layer portion of the concrete frame 100 from peeling. For example, the mesh is 5 to 20 mm long and 5 to 20 mm wide, preferably 10 to 15 mm long and 10 to 15 mm wide. In addition, although the weaving method of the detachment prevention net 1 is appropriate, it is preferable to use, for example, a leno weave or a plain weave.

Furthermore, the anti-separation net 1 is excellent in water resistance, durability, and weather resistance, and has required tensile strength and rigidity as well as required flexibility. It is preferable to have a structure that can follow along the surface of the object, and in this embodiment, as the peeling prevention net 1 with such a structure, PET (polyethylene terephthalate) mesh is coated with PVC (polyvinyl chloride). I'm using what I made.

On the opposite side of the concrete frame 100 from the spalling prevention net 1 arranged along the surface of the concrete frame 100, an elongated plate-shaped strip 2 for fixing the spalling prevention net 1 is provided, and the strip 2 also has a structure. It is installed so as to follow the shape of the surface of a concrete skeleton 100 (see FIGS. 1 to 6). The band plate 2 in this embodiment is made of metal and is formed by processing a metal material. The strip plate 2 has excellent water resistance, durability, and weather resistance, and is thicker than the peeling prevention net 1 and has higher rigidity and strength than the peeling prevention net 1. It can be made of a flexible material and shape, and can be made of GFRP (glass fiber reinforced plastic) or the like in addition to the metal material. In addition, the strip plate 2 has a configuration that can follow along the surface of a curved structure such as the inner peripheral surface of a tunnel, etc., and is highly versatile and adaptable to the surface of various structures. Other than that, for example, it is possible to have a configuration that is excellent in water resistance, durability, and weather resistance, and is formed in a curved shape by bending in the thickness direction with a curvature that follows the curved shape of the inner peripheral surface of the tunnel. be.

A plurality of strip plates 2 for fixing the spalling prevention net 1 are provided at intervals in the axial direction of the tunnel. Although the interval between the strips 2 is arbitrary, it is preferably 800 mm at the maximum from the viewpoint of ensuring the prevention of loosening of the anti-spinning net 1 . In addition, when the spalling prevention net 1 is provided from the top end of the upper half of the tunnel to the side wall, it is preferable that the strip plate 2 is also provided correspondingly from the top end of the upper half of the tunnel to the side wall. The strip plate 2 provided from the top end of the upper half to the side wall can be composed of a plurality of strip plates 2 other than a series of strip plates 2 in the circumferential direction from the top end of the upper half of the tunnel to the side wall. Furthermore, the strip plate 2 installed around the top end and the strip plate 2 installed on the side wall located below the top end periphery are arranged with their positions shifted in the tunnel axis direction. is also possible.

An anchor member insertion hole 21 is formed through the band plate 2 in the central portion in the width direction thereof. A plurality of hook-like projections 22 are formed at intervals on the side of the peeling prevention net 1 in the regions on both sides of the central portion of the strip plate 2, and the regions on both sides are spaced apart in the longitudinal direction of the strip plate 21. A plurality of hook-shaped projections 22 are arranged in rows on each side. In this embodiment, the hook-shaped projections 22 are arranged in a row at regular intervals in the longitudinal direction of the strip plate 2 in each of the regions on both sides of the central portion of the strip plate 2. Each hook-shaped projection 22 is , are formed by cutting and raising the edge of the metal band plate 2 in the width direction (see FIG. 6).

The installation interval of the plurality of hook-shaped projections 22 is set so that each hook-shaped projection 22 can enter the mesh 11 of the anti-spinning net 1 correspondingly. The meshes 11 adjacent to each other in the vertical and horizontal arrangement of the prevention net 1 are correspondingly entered. Further, the shape, size, and position of each hook-shaped projection 22 are such that they can be smoothly inserted into the mesh 11 of the spalling prevention net 1. The shape of the hook-shaped projection 22 in the illustrated example is The hook-shaped projections 22 are provided so that the concave sides of the hook-shaped projections 22 on both sides of the central portion of the band plate 2 face each other, and the concave sides of the hook-shaped projections 22 and 22 are adjacent to each other. Threads 12, 12 of the detachment prevention net 1 are arranged respectively (see FIG. 5). The hook-shaped projections 22 that have entered the mesh 11 of the spalling-preventing net 1 are arranged such that their tips are substantially in contact with the inner peripheral surface of the concrete skeleton 100, which is the surface of the structure.

The band plate 2 is fixed to the concrete frame 100 by the expansion anchor 3 which is an anchor member for fixing the band plate 2 to the structure. The expansion anchor 3 in this embodiment is a so-called anchor pin with a resin injection port, and has a substantially cylindrical main body 31 with a hollow inside, and an arc-shaped groove 32 is formed along the outer periphery of the main body 31 near the tip. A slit 33 is cut in the longitudinal direction beyond the arcuate groove 32 from the tip of the main body 31, and the tip side of the arcuate groove 32 forms an expanded portion 34 divided by the slit 33. - 特許庁

In the hollow part of the main body 31, an expanding body 35 is installed which has a substantially truncated cone shape whose front part expands in diameter toward the rear and a substantially cylindrical shape at the rear part. The front end portion of the hollow portion of the main body 31 is formed with an inner diameter smaller than the maximum outer diameter of the spreader 35 via a stepped portion protruding inward, and this hollow portion does not reach the front end of the main body 31. formed. In the vicinity of the rear end of the main body 11 , an outwardly protruding circumferential flange 36 is provided. An annular sealing member 37 such as a butyl seal is fitted onto the main body 31 on the distal end side of the flange portion 36 so as to be adjacent to the distal end surface of the flange portion 36 .

When installing the expansion anchors 3, perforations 101 are formed in the concrete skeleton 100, the anti-spinning net 1 is arranged along the surface of the concrete skeleton 100, and hooked to correspond to the mesh 11 of the anti-spinning net 1. The band plate 2 is arranged so that the projection 22 is inserted. Then, the washer 4 is arranged so as to push the band plate 2, the expansion anchor 3 in the non-expanded state is inserted through the insertion hole 21 of the washer 4 and the band plate 2, and the expansion anchor 3 is expanded in the non-expanded state. The anchor 3 is driven in to partially break the peeling prevention net 1 to penetrate, and the expansion anchor 3 in the non-expanded state is inserted into the hole 101.例文帳に追加As a result, the band plate 2 is pressed from the opposite side of the concrete frame 100 by the flange portion 36 of the expansion anchor 3 via the annular seal member 37 and the washer 4 .

After that, as shown in FIG. 3, the expansion body 35 of the expansion anchor 3 inserted into the bore 101 is driven by inserting a driving rod through an opening communicating with the hollow portion of the main body 31 to drive the expansion body 35 into the hollow portion. The expansion anchor 3 is mechanically fixed to the concrete frame 100 by passing over the stepped portion of the section and expanding the expansion portion 34 and making the expansion portion 34 bite into the hole wall. Due to the mechanical fixation of the expansion anchor 3, the band plate 2, which is biased toward the concrete frame 100 via the annular seal material 37 and the washer 4 at the flange 36, is fixed so as to follow the surface of the concrete frame 100 and is hooked. The spalling prevention net 1 positioned by entering the mesh 11 of the projections 22 is supported by the fixed belt plate 2 along the surface of the concrete frame 100 and not separated from the surface of the concrete frame 100. be done.

Furthermore, the expansion anchor 3 of this embodiment is fixed to the concrete frame 100 by resin injection. That is, a resin such as a two-liquid mixed hardening type epoxy resin is injected into the hollow portion of the expansion anchor 3 in which the expansion portion 34 has been expanded using an injection tool (not shown), so that the resin is injected into the hollow portion. At the same time, by filling the hole 101 with resin by flowing into the gap between the hole 101 and the expansion anchor 3 from the slit 33, the gap between the hollow part of the expansion anchor 3 and the gap between the hole 101 is filled with a predetermined amount of resin. It is filled with a cured resin 5 that has been cured with the lapse of time. Furthermore, by injecting a highly permeable resin, the quality of the deteriorated concrete frame 100 at which anchors are placed can be improved at the same time.

According to this embodiment, since the hook-shaped projections 22 of the strip plate 2 enter the mesh 11 of the stripping-preventing net 1, the load applied to the stripping-preventing net 1 is evenly distributed along the strip 2, so that the net There is no local breakage of the thread 12 that constitutes 1, and it can withstand peeling under a large load. In addition, since the hook-shaped projections 22 enter the mesh 11, the positional relationship between the strip plate 2 and the peeling prevention net 1 can be fixed with high stability, and the positional deviation from the installation position of the peeling prevention net 1 can be reliably prevented. can be prevented. Further, the hook-shaped projections enter the mesh 11 so that the threads 12, 12 of the peeling prevention net 1 are arranged close to the concave side of the hook-shaped projections 22, 22, thereby stabilizing this positional relationship and the peeling prevention net. The effect of preventing positional deviation from the installation position of 1 becomes more reliable. Therefore, the slackness and sagging of the anti-peeling net 1 can be eliminated, and the anti-peeling net 1 can be brought into almost close contact with the surface of the structure such as the concrete frame 100, and can be stably installed along the surface. can be prevented from peeling off. In addition, since the anti-peeling net 1 can be prevented from being displaced, loosened, and hanging down, and the anti-peeling net 1 can be stably brought into almost close contact with the surface of the structure, good visual inspection of the surface of the structure can be performed. becomes possible.

In addition, by forming the hook-shaped projections 22 by cutting and raising the metal band plate 2, a separate member used as the hook-shaped projections 22 becomes unnecessary, and a simple process such as pressing the band plate 2 is performed. to form a plurality of hook-like projections 22 . Therefore, the manufacturing cost of the strip plate 2 and the construction cost of the spalling prevention structure can be reduced.

In addition, by inserting a plurality of hook-shaped projections 22 arranged in rows in the longitudinal direction on both side regions in the width direction of the strip into the mesh 11 of the anti-spinning net 1, the load is applied to both sides of the portion fixed by the expansion anchor 3. The net 1 can be dispersedly supported, the positional relationship of the anti-peeling net 1 can be fixed on both sides, and the effect of dispersing the load and the effect of preventing the displacement of the anti-peeling net 1 can be exhibited with higher stability. Further, a plurality of hook-shaped projections 22 arranged in rows on both sides in the width direction of the strip are pressed against the surface of the structure so as to substantially abut on the surface of the structure, thereby preventing the strip 2 from peeling off in the width direction. It can be installed and fixed in a state of being substantially parallel to the surface of the net 1 and the structure, and the stability of the installation state of the strip plate 2 can be enhanced.

In addition, by using a PVC-coated PET mesh for the anti-peeling net 1, the rigidity of the anti-peeling net 1 can be increased, and loosening and sagging of the anti-peeling net 1 can be prevented more reliably. Furthermore, the PVC-coated PET mesh has a predetermined rigidity and a predetermined flexibility, and can follow along the surface of a curved structure such as the inner peripheral surface of a tunnel. Therefore, the peeling prevention net 1 having excellent versatility can be obtained. Furthermore, the weather resistance, water resistance, and durability of the anti-peeling net 1 can be improved, and the durability of the anti-peeling structure can be enhanced. Furthermore, the PVC-coated PET mesh can be cut to the required size on-site and can be used even when the surface shape of the structure is complicated, and has high adaptability to the construction site.

In addition, the expansion anchor 3 and the band plate 2 are strongly and stably attached to the back of the structure by the expansion anchor 3 of the resin injection type. It can be fixed to a deep part, and the stability of the installation state of the peeling prevention net 1 can be further enhanced. In addition, even if there is a sign of deterioration in the surface layer portion of the concrete frame 100 and there is unevenness in the mechanical fixing force of the anchor, the anchor fixing force can be stably secured by injecting the resin. Furthermore, by urging the band plate 2 with the flange portion 36 near the rear end of the expansion anchor 3, there is no need to provide a nut at the rear end of the expansion anchor, thereby eliminating the risk of the nut falling off. can.

[Scope of invention disclosed in this specification]
In addition to each invention and embodiment listed as an invention, the invention disclosed in this specification is specified by changing these partial contents to other contents disclosed in this specification within the applicable range, Alternatively, what is specified by adding other contents disclosed in this specification to these contents, or what is specified by deleting these partial contents to the extent that partial effects can be obtained and making them a broader concept contain. The invention disclosed in this specification also includes the following modifications and additional contents.

For example, in the spalling prevention structure of the structure of the present invention, a plurality of hook-like projections are formed at intervals on the side of the spalling prevention net of the strip plate, and the plurality of hook-shaped projections correspond to the meshes of the spalling prevention net. For example, hook-shaped projections are provided in vertical and horizontal arrays in each of the regions on both sides of the central portion in the width direction of the strip, and the hook-shaped projections are provided at regular intervals in the longitudinal direction of the strip. are arranged in multiple rows, or an anchor member insertion hole is formed on one side in the width direction of the band plate, and a plurality of hook-shaped projections are provided on the other side, and the band plate is inclined in the width direction It is possible to adopt a configuration in which it is attached to the surface of the structure in a state where it is folded. In addition, the present invention is not limited to a structure in which a plurality of adjacent hook-shaped projections of the strip plate are inserted into adjacent meshes of the anti-peeling net. It is also possible to adopt a configuration in which the meshes are inserted corresponding to a plurality of meshes such as every other mesh. In addition, the present invention includes an appropriate configuration in which a plurality of hook-shaped projections are formed at intervals on the side of the peeling prevention net of the strip plate, and the hook-shaped projections are provided so as to enter the mesh of the peeling prevention net, For example, among the first, second, and third hook-shaped projections, only the plurality of first and second hook-shaped projections enter the mesh of the peeling prevention net, and the third hook-shaped projection enters the mesh of the peeling prevention net. The present invention also includes a configuration that does not have a

Further, the anchor member in the present invention is not limited to the resin injection type expansion anchor 3 of the above-described embodiment, and includes an appropriate anchor member for fixing the band plate to the structure. For example, if a sleeve driving type anchor is used and the bolt is inserted through the insertion hole 21 of the band plate 2 and tightened with a nut, when it becomes necessary to replace the spalling prevention net 1 or the band plate 2. , the net 1 and the band plate 2 can be replaced only by removing the nut, and the anchor body can be reused as it is. Further, the installation interval of the anchor members is appropriate for the interval between the insertion holes of the corresponding anchor members of the band plate, and is preferably about 400 to 500 mm, for example.

In addition, if the peeling prevention net in the present invention is made of, for example, a PVC-coated PET mesh formed by leno weave, the frictional force at the intersection of the weft and the warp is high, so when a load is applied, the overall load is reduced. However, the configuration of the anti-peeling net is not limited to this, and it is possible to use an appropriate anti-peeling net within the scope of the present invention. Furthermore, the mesh of the peeling-preventing net in the present invention is not limited to the vertical and horizontal mesh, and may be a staggered mesh. It is possible to configure

In addition, the length and width of the spalling prevention net and the length and width of the band plate in the present invention can be appropriately set within the scope of the present invention. In addition, when the curvature of the curved shape of the surface of the structure is large, etc., in places where the spalling prevention net tends to loosen, the installation interval of the strip plate 2 in the tunnel axis direction may be adjusted, or the strip plate 2 may be shorter than the strip plate 2. It is also possible to install additional strips 2a, 2b, etc. between the strips 2 as auxiliary strips (see FIG. 7).

INDUSTRIAL APPLICABILITY The present invention can be used, for example, to prevent flakes from falling on inner walls of tunnels, under bridges, and the like.

DESCRIPTION OF SYMBOLS 1... Peeling prevention net 11... Mesh 12... Thread 2, 2a, 2b... Band plate 21... Insertion hole 22... Hook-shaped projection 3... Expansion anchor 31... Main body 32... Arcuate groove 33... Slit 34... Expansion part 35... Expanding body 36 Flange 37 Annular sealing material 4 Washer 5 Cured resin 100 Concrete frame 101 Perforation

Claims (5)

a mesh-like spalling prevention net arranged substantially closely along the surface of the structure;
a band plate provided on the side opposite to the structure with respect to the peeling-preventing net for fixing the peeling-preventing net;
An anchor member for fixing the strip plate to the structure,
A plurality of hook-shaped projections are formed at intervals on the strip plate on the side of the peel-prevention net, and the hook-shaped projections are provided so as to enter the mesh of the peel-prevention net. structure. 2. A structure according to claim 1, wherein said hook-shaped projections of said strip plate are formed by cutting and raising said strip plate made of metal. An insertion hole for the anchor member is formed in the central portion of the band plate in the width direction,
3. A structure according to claim 1 or 2, wherein a plurality of said hook-shaped projections are arranged in a line on both sides of said central portion at intervals in the longitudinal direction of said band plate. structure. 4. The structure according to any one of claims 1 to 3, wherein the anti-slip net is a PVC-coated PET mesh. The anchor member is a resin-injected expansion anchor,
The expansion anchor is fixed to the structure in a state in which the expansion portion of the expansion anchor is expanded and the gap of the expansion anchor is filled with a cured resin,
5. The spalling of the structure according to any one of claims 1 to 4, wherein the band plate is urged toward the structure by a flange provided in the vicinity of the rear end of the expansion anchor. prevention structure.

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