JPH07486Y2 - Protective material for concrete structures - Google Patents

Description

[Detailed Description of the Invention] <Industrial field of application> The present invention relates to a protective material for concrete structures, and more specifically, to a protective material for protecting the surface of concrete structures such as concrete piers, quays, and breakwaters. .

<Problems to be solved by conventional technologies and devices> Rocks and driftwood contained in fluids are used for concrete structures such as piers, quays, breakwaters, etc., which are constructed along rapid rivers, coasts where rough seas storm, etc. However, it is necessary to protect it from damage by some method because it is severely damaged (eroded) by the collision of foreign matter such as gravel and its life is shortened.

From the above viewpoint, conventionally, a thick wooden protector is attached to the surface of a concrete structure, or a tetra pot is arranged. However, the protector rots and rots relatively early by being impregnated with river water, seawater, etc., and is damaged relatively early by collision with rocks, driftwood, gravel, etc. There wasn't. Further, with respect to the tetrapot, although it was possible to reduce the impact or reduce the number of impacts, it was not a fundamental solution.

Therefore, it is also practiced to increase the thickness of the surface in advance in consideration of wear of the concrete structure. However, in this case, for example, assuming that the amount of wear of the concrete structure is 15 cm per year, it will be 1.
Since it is necessary to make the thickness of the surface as thick as 5 m, the construction cost is high and the space is disadvantageous.

Therefore, a steel plate protector whose surface is lined with rubber, plastic, etc. has been developed, but the problem is that the lining is easily peeled off by impact, or the steel plate is easily corroded by river water, seawater, etc., resulting in poor durability. there were.

<Object of the Invention> The present invention has been made in view of the above problems, and an object thereof is to provide a protective material for a concrete structure which has excellent durability and can reliably protect the concrete structure. And

<Means for Solving Problems> As a protective material for a concrete structure of the present invention to achieve the above-mentioned object, a bendable flexible structure attached to the concrete structure to prevent damage to the surface of the concrete structure. A plate-like protective material, which is behind the surface layer having abrasion resistance against the collision of foreign matter contained in the fluid, and which absorbs the impact due to the collision of the foreign matter, and which is softer than the surface layer A cushion layer is provided.

However, the surface layer is preferably made of a rubber having a high hardness, and the rubber has a hardness (a hardness by a spring type hardness test (A type) specified in JIS K 6301, the same applies hereinafter).
Is more preferably 70 to 90 °, and may be a mixture of short fibers for reinforcement.

Further, the surface layer may be composed of a large number of small pieces made of ceramics, and in this case, it is preferable that a gap having a predetermined width is provided between the small pieces.

<Action> According to the protective material for a concrete structure having the above-mentioned configuration, the surface layer ensures durability against abrasion and cutting action due to rocks, gravel, etc., and the cushion layer protects against relatively large foreign matter such as driftwood. The impact due to a collision can be absorbed.

In particular, when the surface layer is made of high hardness rubber having a hardness of 70 to 90 °, good durability against the above frictional action and the like can be exhibited. Further, when the high hardness rubber is a mixture of reinforcing short fibers, it is possible to secure a very high hardness while maintaining the elasticity of the rubber, so that the cutting resistance, Impact resistance can be improved significantly. Further, even when the surface layer is made of small pieces made of ceramics, good durability against frictional action and cutting action can be exhibited, and a gap of a predetermined width is provided between the small pieces made of ceramics. In that case, the protective material can be elastically deformed without difficulty due to the gap.

<Example> Hereinafter, a detailed description will be given with reference to the accompanying drawings showing an example.

FIG. 1 is a perspective view showing a protective member (A) of the present invention.
The protective material (A) has a multi-layer structure in which a cushion layer (2) made of plate-like soft rubber is laminated behind a surface layer (1) having abrasion resistance, and in the case of the figure. The overall shape is a rectangular plate.

The surface layer (1) is formed of a rubber having a high hardness, the hardness of which is preferably 70 to 90 °, and the cushion layer (2) is a rubber softer than this. For example, a hardness of 40 to 70 ° is suitable.

Further, as the rubber constituting the surface layer (1), a rubber having excellent aging resistance, seawater resistance, weather resistance and the like is used, and its tensile strength is 160 kgf / mm ² or more. ,
The elongation is preferably 350% or more, the tensile strength and elongation after aging are 80% or more before aging, and the hardness difference before and after aging is preferably within 8 °. Further, the total thickness of the protective material (A) is set to 20 mm or more, more preferably about 40 to 50 mm, and the thickness of the surface layer (1) is usually set to about 5 to 10 mm. In combination with the above hardness, it is configured to be bendable as a whole.

As shown in FIG. 2, the protective material (A) having the above-mentioned configuration is in a state in which the cushion layer (2) side is in contact with the concrete structure (B) such as a pier, a quay, a breakwater, or the like, It is used by fixing it with bolts (3), etc., the surface layer (1) ensures durability against abrasion and cutting action due to rocks, gravel, etc., and the cushion layer (2) provides impact due to collision with driftwood, etc. Can be absorbed. Therefore,
The concrete structure (B) can be protected for a long period of time.

In the above example, the high hardness rubber that constitutes the surface layer (1) may be mixed with reinforcing short fibers. In this case, the surface of the rubber is maintained while maintaining the elasticity of the rubber. Since the hardness of the layer (1) can be made even harder, it is possible to exhibit good durability against the cutting action due to sharp gravel and the like, and also to significantly improve impact resistance. . As the reinforcing short fibers, aramid fibers (aromatic polyamide fibers) are particularly suitable, and for example, fibers having a length of about 0.1 to 1 mm are preferably mixed at a ratio of 2 to 10 phr.

FIG. 3 is a perspective view showing another embodiment. In this embodiment, the surface layer (1) is composed of a large number of small pieces (4) made of fine ceramics. The small piece (4) is attached to the rubber substrate (5) laminated on the cushion layer (2) or directly attached to the cushion layer (2). According to this embodiment, the toughness of the fine ceramics can further protect the protective material (A) from abrasion and cutting.

The sticking of the above-mentioned small piece (4) is carried out by applying a Cn ₂ O-based paste by printing on the back surface of the small piece (4) and heat-treating it in the atmosphere to form an oxide multi-layer (metallized layer) and then adhering. Bonding with an agent is preferable because good adhesive strength can be secured. Further, as the small piece (4), for example, a rectangular shape having a thickness of 3 to 10 mm and a side length of 10 to 50 mm is used, but other shapes such as a triangle, a hexagon, and a rhombus are also used. Also used. However, in any case, it is preferable to provide a gap of about 1 mm between the small pieces (4) because elastic deformation of the protective material (A) can be performed without difficulty.

As the rubber constituting the substrate (5), for example, a rubber having a hardness of 70 to 90 ° is used, but a rubber softer than this can also be used.

The protective material for the concrete structure of the present invention is not limited to the above-mentioned embodiment, and for example, in the embodiment shown in FIG. 1, the rubber constituting the surface layer (1) is further improved in order to further improve the durability. For example, by encrusting ceramic chips on the inside, embedding a reinforcing metal plate inside the cushion layer (2), forming the whole shape into another shape such as a tube shape, etc. Various design changes can be made without changing the gist.

<Effect of Device> As described above, according to the protective material for a concrete structure of the present invention, the surface layer ensures durability against abrasion, cutting, etc., and the cushion layer protects against impact due to collision of driftwood, etc. Since it can be absorbed, it has a unique practical effect of being able to protect the concrete structure for a long period of time.

[Brief description of drawings]

FIG. 1 is a perspective view of a protective material, FIG. 2 is a perspective view showing a usage state, and FIG. 3 is a perspective view showing another embodiment. (1) ... surface layer, (2) ... cushion layer, (4) ...
… Small ceramic pieces, (A) …… Protective material, (B) …… Concrete structure

Claims (9)

[Scope of utility model registration request] 1. A flexible, plate-like protective material attached to a concrete structure to prevent damage to the surface of the concrete structure, which is wear-resistant against collision of foreign matter contained in a fluid. A protective material for a concrete structure, characterized in that a cushion layer, which is softer than the surface layer and absorbs the impact due to the collision of foreign matter, is provided behind the surface layer having the property. 2. The protective material for a concrete structure according to claim 1, wherein the surface layer is made of high hardness rubber. 3. A rubber having a high hardness has a hardness (a hardness according to a spring type hardness test (A type) specified in JIS K 6301) of 70 to 90.
The protective material for a concrete structure according to claim 2, wherein the utility model registration is 0 °. 4. The protective material for a concrete structure according to claim 2, wherein the high hardness rubber is a mixture of short fibers for reinforcement. 5. The protective material for a concrete structure according to claim 4, wherein short fibers are mixed in an amount of 2 to 10 phr. 6. The protective material for a concrete structure according to claim 4, wherein the short fibers are aramid fibers. 7. The protective material for a concrete structure according to claim 2, wherein the high hardness rubber has ceramic chips scattered on at least the surface thereof. 8. A protective material for a concrete structure according to claim 1, wherein the surface layer is composed of a large number of small pieces made of ceramics. 9. The protective material for a concrete structure according to claim 8, wherein a space having a predetermined width is provided between the ceramic pieces.