JP6906463B2 - Laminated board - Google Patents

Description

The present invention relates to a member for repairing an inner surface of an existing waterway, a deteriorated wall surface such as a wall surface of a viaduct, and a laminated board used as a decorative member.

As a repair material for repairing a deteriorated wall surface such as the inner surface of a waterway for sewage or agricultural water that has deteriorated over time, for example, a fiber reinforced plastic mortar composite material (hereinafter, abbreviated as FRPM plate) shown in Patent Document 1 is used. There is. This FRPM plate has a structure in which a fiber reinforced plastic layer (hereinafter, abbreviated as FRP) is laminated on the front and back surfaces of a resin mortar layer (see paragraph 0004 of Patent Document 1, FIG. 4). By providing this FRPM plate on the inner surface of a water channel that has deteriorated over time, the hydraulic characteristics of the water channel can be improved, and a flow rate equal to or higher than that of the water channel before repair can be secured.

JP-A-2002-294664

The FRPM plate according to Patent Document 1 has an advantage of being excellent in strength. On the other hand, a resin mortar layer having a large specific gravity is arranged in the intermediate layer, and the FRPM plate as a whole tends to have a large weight. For this reason, it is necessary for a plurality of workers to carry out the transportation work, and it is necessary for a plurality of workers to share each work such as supporting, positioning, and fixing the FRPM plate when fixing to the wall surface. There is a problem that requires a lot of labor and cost. In addition, if the FRPM plate is accidentally dropped in the water channel through which water is flowing, it will sink to the bottom of the water, and there is a problem that it takes time to pull it up.

In addition, existing waterways are not limited to straight ones, but some are gently curved, but the FRPM plate is hard and rigid and cannot follow the curve, which limits its application to curved waterways. There is also.

Therefore, an object of the present invention is to provide a laminated board having good handleability and a wide range of shape application.

In order to solve the above problems, the present invention has a plate-shaped core material layer having flexibility and a reinforcing layer laminated on at least one of the front and back surfaces of the core material layer, and the core material. A laminated board having a specific gravity of less than 1 in the entire laminated body including the layer and the reinforcing layer was constructed.

In this way, the flexible core material layer secures the flexibility of the laminated body as a whole, and the reinforcing layer laminated on the front and back surfaces of the core material layer secures a predetermined strength of the laminated plate. can do. Further, by setting the specific gravity of the entire laminate to less than 1, it is possible to obtain good handleability for the FRPM plate, and even if the laminate is accidentally dropped into a water channel through which water is flowing, it is submerged in water. Since it does not sink, it can be easily pulled up.

In the above structure, it is preferable that the core material layer is made of foamed resin and the reinforcing layer is made of fiber reinforced plastic. By adopting the foamed resin for the core material layer in this way, it is possible to form a core material layer at low cost and with little deterioration over time. Further, by adopting FRP for the reinforcing layer, it is possible to secure a predetermined strength while making the laminated board thin.

In each of the above configurations, the thickness of the entire laminate is preferably 6 mm or more and 10 mm or less. By doing so, it is possible to achieve both rigidity and flexibility of the laminated board. For example, when this laminated board is used for repairing an existing water channel, it is applied to either a straight line or a curved shape of the existing water channel. be able to. Further, even when the inner wall of the existing water channel has irregularities, the laminated plate can be made to follow the irregularities. If the thickness is less than 6 mm, warpage is likely to occur due to insufficient rigidity when the laminated plate is provided on the inner surface of the water channel, which is not preferable. Further, when this thickness exceeds 10 mm, the flexibility is lowered and the followability to the inner surface of the water channel having a curved shape or unevenness is lowered, which is not preferable.

In the configuration in which the thickness range of the entire laminated body is defined as described above, the thickness of the reinforcing layer is preferably 1.2 mm or more and 2.0 mm or less. In this way, as described above, it is possible to secure both the predetermined rigidity by the reinforcing layer and the flexibility by the core material layer.

In each of the above configurations, the specific gravity of the entire laminate is preferably 0.7 or more and 0.9 or less. In this way, it is possible to achieve both ease of handling due to weight reduction and ensuring a predetermined strength. When this specific gravity is less than 0.7, the lightness is improved, but the rigidity of the laminated board may be significantly reduced. Further, when this specific gravity exceeds 0.9, the rigidity is improved, but the lightness is lowered.

In the configuration in which the specific gravity range of the entire laminated body is defined as described above, the specific gravity of the core material layer is preferably 0.3 or more and 0.4 or less. In this way, the specific gravity of the entire laminated body can be easily set to less than 1, more preferably 0.7 or more and 0.9 or less.

In each of the above configurations, it is preferable to provide an adhesive layer for adhering both layers between the core material layer and the reinforcing layer. In this way, it is possible to perform press molding collectively after stacking a plurality of sets of the core material layer and the reinforcing layer laminated on the core material layer, and the manufacturing cost per laminated plate is significantly increased. Can be reduced to.

The laminated board according to each of the above configurations can be used as a repair member for repairing the surface of a deteriorated wall surface or as a decorative member for giving an aesthetic appearance to the surface. Since this laminated board is significantly lighter than a general FRPM board, it is easy to handle, and since it has a predetermined flexibility, it has a wide range of shape application and can be used as a repair member. Suitable. Further, the reinforcing layer formed on the surface of the laminated board often has glossiness and flatness, and by providing the laminated board as a decorative member on the deteriorated wall surface, a predetermined aesthetic appearance can be given. ..

The inner surface of the existing waterway is suitable as the deteriorated wall surface. As mentioned above, this laminated board is significantly lighter than a general FRPM board, so when repairing an existing waterway, the laminated board is mistakenly inserted into the waterway through which water is flowing. Even if you drop it, it will not sink in the water. Therefore, the laminated board can be easily pulled up, and the work can proceed smoothly without interruption.

In the present invention, a plate-shaped core material layer having flexibility and a reinforcing layer laminated on at least one of the front and back surfaces of the core material layer are provided, and the core material layer and the reinforcing layer are laminated. A laminated board having a specific gravity of less than 1 for the whole body was constructed. According to this configuration, the weight of the entire laminated body can be reduced and good handleability can be ensured. Moreover, since the flexible core material layer has the flexibility of the laminated body as a whole, it is possible to provide a laminated board having a wide range of shape application.

Perspective view which shows one Embodiment of the laminated board which concerns on this invention. A cross-sectional view of the laminated board shown in FIG. 1 as viewed from the extension direction of the channel, showing an application example (first example) of the existing channel for repairing the inner surface. Sectional drawing which shows the main part of FIG. A cross-sectional view seen from above of the water channel showing an application example (second example) of the laminated board shown in FIG. 1 to repair the inner surface of the existing water channel. A partially cutaway perspective view showing an application example (third example) of the laminated board shown in FIG. 1 to the wall surface repair of the viaduct.

An embodiment of the laminated board 10 according to the present invention is shown in FIG. The laminated board 10 is a repair member that can be used as a substitute for the FRPM board, which has been conventionally used as a repair material for repairing the inner surface of an existing water channel 1 for sewage, agricultural water, etc. that has deteriorated over time, and is flexible. It has a plate-shaped core material layer 11 having the above, and a reinforcing layer 12 laminated on the front and back surfaces of the core material layer 11.

The core material layer 11 is made of a foamed resin molded into a plate shape (for example, width 1000 mm, length 2000 mm, thickness 5 mm). In this embodiment, polyvinyl chloride (PVC) cured after foaming is used as the foamed resin. The specific gravity of the core material layer 11 (foamed resin) is about 0.35. This specific gravity can be changed by changing the material of the foamed resin and the foaming ratio. This specific gravity is preferably in the range of 0.3 or more and 0.4 or less.

The reinforcing layer 12 is made of FRP formed in a plate shape (for example, width 1000 mm, length 2000 mm, thickness 1.5 mm) so as to be overlapped with the core material layer 11. In this embodiment, a liquid unsaturated polyester resin for fiber reinforced plastic specified by JIS K6919 is impregnated with glass fibers specified by JIS R3412 and cured. Instead, the glass fiber specified in JIS R3417 can be adopted. The specific gravity of FRP produced from the above resin material and glass fiber is about 1.6.

The reinforcing layer 12 is formed by line molding in which a liquid unsaturated polyester resin for fiber reinforced plastic impregnated with glass fibers is extruded from a mold to obtain FRP having a predetermined thickness. The method for manufacturing the reinforcing layer 12 is arbitrary, and a hand lay-up method may be adopted in which the reinforcing fiber sheet is repeatedly impregnated with the uncured resin to form the reinforcing layer 12 having a predetermined thickness. can.

An adhesive layer 13 for adhering both layers 11 and 12 is provided between the core material layer 11 and the reinforcing layer 12. The thickness of the adhesive layer 13 is sufficiently thin as compared with the thickness of the core material layer 11 and the reinforcing layer 12, and has almost no effect on the thickness of the entire laminated body. When forming the laminated board 10, a reinforcing layer 12 is provided on the front and back surfaces of the core material layer 11 via an adhesive layer 13 (“reinforcing layer 12 / adhesive layer 13 / core material layer 11 / adhesive layer 13 / reinforcing layer”. A plurality of sets of 12 ”) are stacked, and press molding is performed by a press machine in this stacked state. By doing so, a large amount of laminated plates 10 can be formed by one press molding, and the manufacturing cost can be reduced. The number of stacks can be appropriately determined in consideration of the press capacity and workability of the press molding machine.

The total thickness of the laminated board 10 composed of the core material layer 11, the reinforcing layer 12, and the adhesive layer 13 is about 8 mm. At this time, the specific gravity of the entire laminated body is about 0.8, which is the weighted average of the specific densities of the core material layer 11 and the reinforcing layer 12. By setting the specific gravity to less than 1 (particularly in the range of 0.7 or more and 0.9 or less) in this way, the laminated board 10 can be sufficiently reduced in weight (about 40% of the weight of the FRPM board having the same thickness). , Good handleability can be ensured.

Further, as described above, by setting the thickness of the reinforcing layer 12 to 1.5 mm, it is possible to achieve both the predetermined rigidity of the reinforcing layer 12 and the flexibility of the core material layer 11. As described above, in order to achieve both the rigidity and the flexibility of the laminated board 10, it is preferable that the thickness of the reinforcing layer 12 is within the range of 1.2 mm or more and 2.0 mm or less.

The widths and lengths of the core material layer 11 and the reinforcing layer 12 are merely examples, and can be appropriately changed depending on the use of the laminated board 10.

FIG. 2 shows an application example (first example) of the laminated board 10 according to the present invention to repair the inner surface of the existing water channel 1. The existing waterway 1 has a U-shaped cross section in the waterway extension direction, and extends linearly in a plan view. Laminated plates 10 are provided on both side surfaces and the bottom surface of the existing water channel 1, respectively. Each laminated plate 10 is fixed to the inner surface of the existing water channel 1 by anchor bolts 2.

As shown in FIG. 3, the anchor bolt 2 is composed of a tapered head portion 2a and a main body portion 2b having a constant outer diameter. As shown in FIG. 3, by making the thickness of the reinforcing layer 12 constituting the laminated plate 10 about the same as the axial length of the head 2a of the anchor bolt 2, the taper of the head 2a makes the laminated plate 10 It can be pressed against the inner surface side of the existing water channel 1, and the laminated plate 10 is securely fixed to the inner surface of the existing water channel 1.

As described above, the thickness of the reinforcing layer 12 of the laminated plate 10 is 1.5 mm, and the reinforcing layer 12 secures a predetermined rigidity. Therefore, as shown in FIG. 2, the laminated plate 10 is fixed to the flat inner wall. When this is done, it is possible to prevent the laminated plate 10 from warping and ensure excellent hydraulic characteristics. The distance between the anchor bolts 2 can be appropriately determined as long as the laminated plate 10 can be fixed to the inner wall of the existing water channel 1 reliably and without warping, and can be, for example, 30 cm.

FIG. 4 shows an application example (second example) of the laminated board 10 according to the present invention to repair the inner surface of the existing water channel 1. The existing waterway 1 has a U-shaped cross section in the waterway extension direction, and is extended so as to draw a curve in a plan view. Laminated plates 10 are provided on both side surfaces and the bottom surface of the existing water channel 1, respectively. Similar to the first example described with reference to FIG. 2, each laminated plate 10 is fixed to the inner surface of the existing water channel 1 by anchor bolts 2.

The laminated board 10 has a core material layer 11 having a thickness of 5 mm and a reinforcing layer 12 laminated on the front and back surfaces of the core material layer 11 having a thickness of 1.5 mm, similarly to the laminated board 10 used in the first example. , The total thickness is about 8 mm. The laminated plate 10 has a predetermined flexibility, and can be easily made to follow the curved water channel side surface by driving the anchor bolt 2. As a result, the repair work of the existing waterway 1 can be smoothly performed. The laminated plate 10 provided on the bottom surface of the existing water channel 1 is appropriately cut according to the shape of the curve.

As described in the first and second examples above, in the laminated board 10 according to the present invention, the thickness of the reinforcing layer 12 is set within a predetermined thickness range (1.2 mm or more and 2.0 mm or less), and the thickness is set to a predetermined range (1.2 mm or more and 2.0 mm or less). The thickness of the laminated board 10 was set within a predetermined range (6 mm or more and 10 mm or less). As a result, sufficient rigidity that does not cause warpage when the laminated plate 10 is applied to the linear existing water channel 1 is ensured. Further, when the laminated plate 10 is applied to the curved existing water channel 1, it has a followability to the inner surface thereof, and high adaptability to the shape of the existing water channel 1 is ensured. Moreover, since the specific gravity is small, it has good handleability and the repair work can be performed smoothly.

FIG. 5 shows an example (third example) in which the laminated board 10 according to the present invention is applied to the wall surface repair of the viaduct 3. The laminated plate 10 is fixed to the outer wall surface of the viaduct 3 by anchor bolts 2. In the laminated board 10, the thickness of the core material layer 11 is 5 mm, and the thickness of the reinforcing layer 12 laminated on the front and back surfaces of the core material layer 11 is 1. At 5 mm, the total thickness is about 8 mm. Since the laminated board 10 has a predetermined rigidity, it functions as a repair member for surely preventing concrete pieces and the like from peeling off from a wall surface that has deteriorated over time, and is a cosmetic member for improving the aesthetic appearance of the viaduct 3. Also works as.

The specific gravity of the laminated board 10 is 0.8, which is significantly lighter than that of a general FRPM board (about 40% of the weight of a FRPM board having the same thickness) and easy to handle. Therefore, it is possible to perform the mounting work from the inside of the viaduct 3 to the outside of the wall surface without assembling the scaffolding for work on the outer wall surface of the viaduct 3, and it is possible to ensure high safety of the work.

The laminated board 10 described above is an example in all respects, and as long as the problem of the present invention of providing the laminated board 10 having good handleability and a wide range of shape application can be solved, the configuration thereof is configured. It can be changed as appropriate.

For example, in the above embodiment, the reinforcing layer 12 is laminated on both the front and back surfaces of the core material layer 11, but the reinforcing layer 12 is formed on only one surface of the front and back surfaces. You can also do it. Further, it is also possible to have a configuration in which a portion without the reinforcing layer 12 (a portion where the core material layer 11 is exposed) exists instead of the entire front and back surfaces of the core material layer 11.

Further, in the above embodiment, the reinforcing layer 12 is laminated on the front and back surfaces of the pre-cured core material layer 11 via the adhesive layer 13, but at least one of the core material layer 11 or the reinforcing layer 12 is used. It is also conceivable to press-mold with a press machine in an uncured state. At this time, if at least one of the core material layer 11 and the reinforcing layer 12 has adhesiveness, the adhesive layer 13 interposed between the two layers 11 and 12 may be omitted.

1 Existing waterway 2 Anchor bolt 2a Head 2b Main body 3 Viaduct 10 Laminated plate 11 Core material layer 12 Reinforcing layer 13 Adhesive layer

Claims (6)

It has a plate-shaped core material layer (11) having flexibility and a reinforcing layer (12) laminated on at least one of the front and back surfaces of the core material layer (11), and the core material layer (11). ) And the reinforcing layer (12), the specific density of the entire laminate is set to less than 1 .
The core material layer (11) is made of foamed resin, and the reinforcing layer (12) is made of fiber reinforced plastic.
The thickness of the entire laminate is 6 mm or more and 10 mm or less.
A repair member for repairing the surface of a deteriorated wall surface, which can be made to follow a curved side surface by driving an anchor bolt (2), or a laminated board used as a decorative member for giving an aesthetic appearance to the surface. The laminated board according to claim 1 , wherein the reinforcing layer (12) has a thickness of 1.2 mm or more and 2.0 mm or less. The laminated board according to claim 1 or 2 , wherein the specific gravity of the entire laminated body is 0.7 or more and 0.9 or less. The laminated board according to claim 3 , wherein the core material layer (11) has a specific gravity of 0.3 or more and 0.4 or less. The invention according to any one of claims 1 to 4 , wherein an adhesive layer (13) for adhering both layers (11, 12) is provided between the core material layer (11) and the reinforcing layer (12). Laminated board. The laminated board according to any one of claims 1 to 5, wherein the deteriorated wall surface is an inner surface of the existing water channel (1).

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