JP2009150166A - Concrete composite product - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a concrete composite product having a complex structure which can prevent cracking of a covering material molded by concrete on the peripheral surface of a core material. <P>SOLUTION: The concrete composite product 10 is provided with the core material 11, a shock absorbing material 12, and the covering material 13. The shock absorbing material 12 absorbs the amount of contraction of the concrete provided on the peripheral surface of the core material 11, and the covering material 13 is molded by concrete on the peripheral surface through the medium of the shock absorbing material 12. It is desirable that the shock absorbing material 12 employs a material having elasticity or plasticity, and that the covering material 13 employs ultrahigh strength fiber reinforced concrete (UFC), a high-toughness cement composite material (ECC), fiber mixing concrete (FRC, FRM), polymer cement concrete (PCC, PCM), or polymer concrete (PC, PM). <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a concrete composite product having a composite structure in which a core is covered with concrete.

  In a concrete composite product having a composite structure in which a core material such as a steel material is covered with concrete, there are the following methods in particular for covering the outer peripheral (outer) surface of the steel material with concrete.

(1) Cover the steel by spraying thin concrete (mortar containing resin fiber, steel fiber, rock wool, etc.) on the steel. This is applied to fireproof coverings such as architectural columns and beams, or inner surface coverings of steel segments (see, for example, Patent Documents 1 and 2).

(2) There is a method of embedding steel in concrete. This corresponds to a general RC structure or SRC structure.

(3) Core materials include steel, concrete, stone, and wood. Incidentally, there is an internal pressure pipe in which the outer periphery of a concrete pipe (fume pipe) is covered with a tension steel wire and sprayed mortar.

  Here, there is no conventional technique for controlling the occurrence of cracks in the method of coating the outer peripheral (outer) surface of steel with a thin concrete.

  In the prior art (fireproof coating), since the covered part is covered with another material or placed in a space that cannot be seen from the outside, the occurrence of cracks is not regarded as a problem.

On the other hand, when the coated concrete is larger than the steel area, the occurrence of cracks is small or not so noticeable (for example, SRC structure). Moreover, in the case where the shrinkage of the concrete is not restrained, cracks are unlikely to occur (for example, the inner surface of an existing tunnel).
Japanese Unexamined Patent Publication No. 2007-133202 (first page, FIG. 3) Japanese Patent Laying-Open No. 2005-194124 (first page)

  When the outer periphery (outside) of steel is covered with concrete (a fiber mortar is a commonly used material), the mass (area) of the outer concrete (mortar) compared to the mass (area) of the steel If the amount is small, the following phenomenon occurs due to the restraint of the steel material and the self-shrinkage and drying shrinkage of the concrete.

  Cracks occur in the outer concrete (mortar). The direction of occurrence of cracks is not uniform. In particular, outer concrete (mortar) has a large amount of shrinkage deformation (total of self-shrinkage and drying shrinkage) in powder-type materials (for example, ultra-high-strength fiber reinforced concrete (UFC) and high-toughness cement composite material (ECC)). The material is a material in which the generation of cracks due to the amount of shrinkage deformation is suppressed by the combination (compounding) of the materials used, but cracks occur due to the restraint of the steel material.

  This invention is made | formed in view of such a point, and it aims at providing the concrete composite product of the composite structure which can prevent the crack of the coating material shape | molded with the concrete on the surrounding surface of the core material.

  The invention described in claim 1 includes a core material, a buffer material that absorbs the amount of concrete shrinkage provided on the peripheral surface of the core material, and a coating formed on the peripheral surface with concrete through the buffer material. It is a concrete composite product with materials.

  In the invention described in claim 2, the covering material in the concrete composite product according to claim 1 is any one of ultra high strength fiber reinforced concrete, high toughness cement composite material, fiber mixed concrete, polymer cement concrete and polymer concrete. It is supposed to be.

  According to a third aspect of the present invention, the cushioning material in the concrete composite product according to the first or second aspect is a material that can be applied or adhered with elasticity or plasticity.

  According to a fourth aspect of the present invention, in the concrete composite product according to any one of the first to third aspects, the peripheral surface of the covering material formed of concrete is further covered with another covering material via another buffer material. It is what.

  According to the first aspect of the present invention, even if the covering material formed of concrete shrinks and deforms, the cushioning material absorbs the shrinkage amount of the covering material, so that cracking of the covering material can be prevented.

  According to the invention described in claim 2, the super high strength fiber reinforced concrete or the high toughness cement composite material in which the coating material is a material in which the occurrence of cracks due to the amount of shrinkage deformation is suppressed by the combination (compounding) of the materials used. However, cracks occur due to the restraint of the core material, but since the amount of shrinkage of the concrete is absorbed by the buffer material, it is possible to prevent cracking of these coating materials provided on the peripheral surface of the core material.

  According to the third aspect of the present invention, when a material that can be applied or bonded with elasticity or plasticity is used as a cushioning material, construction on the core material is easy.

  According to the fourth aspect of the present invention, a composite composite product having a composite structure suitable for a containment container such as industrial waste with an emphasis on leakage prevention can be provided by the multilayer cushioning material and the covering material.

  Hereinafter, the present invention will be described in detail with reference to an embodiment shown in FIGS. 1 and 2 and an application example shown in FIGS.

  FIG. 1 shows a concrete composite product 10 having a composite structure. A core material 11, a buffer material 12 for absorbing the amount of concrete shrinkage provided on the peripheral surface of the core material 11, and its periphery through the buffer material 12. A covering material 13 formed of concrete on the surface and a protective material 14 provided on the peripheral surface of the covering material 13 are provided.

  The core material 11 is typically a steel material, but a concrete product or the like may be used. Further, the shape of the core material 11 shown in FIG. 1 is circular, but may be other shapes, for example, a core material having a polygonal shape.

  The covering material 13 for covering the core material 11 is ultra high strength fiber reinforced concrete (UFC), high toughness cement composite material (ECC), fiber mixed concrete (FRC, FRM), polymer cement concrete (PCC, PCM) and polymer concrete. Any of (PC, PM) is desirable, however, concrete in which reinforcing bars or resin fibers are arranged in a planar or three-dimensional form and mixed with an expansion agent, or concrete impregnated with a resin may be used.

  The cushioning material 12 in the concrete composite product 10 is a material having elasticity or plasticity after curing, for example, an elastic or plastic resin material, an elastic or plastic resin material containing an inorganic foam (processed into a sheet shape), an inorganic foam Heat-shielding material (processed into a sheet) containing a material, heat-insulating material (processed into a sheet) containing an inorganic foam, and other materials that can be applied or bonded (processed into a sheet) However, bituminous materials (asphalt), rubber, paper, felt, etc. may be used.

  The protective material 14 is preferably a material that can be applied, a material having permeation performance, or a fiber sheet bonded with a resin-based material. However, the protective material 14 remains as it is or a material used for the outer mold (for example, a steel pipe). , Resin tube, drum can, resin container) or the like may be used as the protective material 14 as it is. The protective material 14 may be omitted.

  Then, as shown in FIG. 2, (a) a core material 11 is prepared, (b) a buffer material 12 that absorbs the amount of shrinkage of concrete is applied or wound around the peripheral surface of the core material 11, and (c) A covering material 13 is formed on the peripheral surface of the cushioning material 12 and subjected to necessary curing, and (d) a protective material 14 is provided on the peripheral surface of the covering material 13. The protective material 14 may or may not be used as it is in the outer mold for molding the covering material 13.

  In this way, in the production means in which the outer periphery (outside) of the core material 11 is covered with the covering material 13 formed of concrete to form a composite structure, the shrinkage of the concrete between the core material 11 and the outer covering material 13 By providing the cushioning material 12 that absorbs the amount, the concrete composite product 10 that can prevent the occurrence of “cracking” on the surface of the outer covering material 13 is provided.

  Next, the function and effect of the embodiment will be described.

  Even if the covering material 13 formed of concrete shrinks and deforms due to self-shrinkage and drying shrinkage, the cushioning material 12 absorbs the amount of shrinkage of the covering material 13, so that cracking of the covering material 13 can be prevented.

  Even if the covering material 13 is an ultra high strength fiber reinforced concrete (UFC) or high toughness cement composite material (ECC) with a performance that suppresses the occurrence of cracks due to shrinkage deformation, the covering material 13 is covered by the restraining effect of the core material 11. Since the surface of the material 13 is finely cracked, the amount of shrinkage of the concrete is absorbed by the cushioning material 12, so that the coating material 13 provided on the peripheral surface of the core material 11 can be prevented from cracking.

  The protective material 14 is a protective layer that is provided after the covering material 13 is molded and subjected to the required curing, and can improve the durability of the concrete composite product. If the member is used as a frame (for example, a steel pipe, a resin pipe, a drum can, a resin container, etc.) and does not need to be removed, the protective material 14 can be used as it is.

  When the cushioning material 12 is formed by applying a material with elasticity or plasticity and undergoing a predetermined curing, or by bonding a material processed into a sheet shape with elasticity or plasticity, the construction to the core material 11 is easy It is.

  Next, FIG. 3 shows a concrete composite product 10a having a composite structure constructed in water, and is an example in which a covering material 13 is partially applied to the surface of a core material 11 such as a concrete column, A covering material 13 formed of concrete is provided with a cushioning material 12 on the peripheral surface of the core material in a range that is susceptible to erosion.

  Next, FIG. 4 shows a multilayer concrete composite product 10b. The surface of the covering material 13 formed of concrete, that is, the outer peripheral surface, is further covered with another cushioning material 12a made of the same material or another material. This is an example of coating with the material 13a, and when the multilayer concrete composite product 10b is used as a container, the outer protective material 14 is projected upward from the upper surface of the core material 11 to the covering material 13a, and the protective material 14 is placed inside the protective material 14. The lid 15 is fitted on the core material 11 to the covering material 13a so that the lid 15 is inserted.

  As described above, the multilayer concrete composite product 10b formed of the multilayer buffer materials 12 and 12a and the covering materials 13 and 13a is suitable for a storage container such as industrial waste in which leakage prevention is important. In such a case, the lid body 15 may be bonded to the upper surfaces of the core material 11 to the covering material 13a using an adhesive 15a.

  The maximum amount of self-shrinkage and drying shrinkage of concrete (fiber-mixed mortar) provided on the outer periphery of steel (assuming no dimensional change) is 1000 μm. For example, assume that a 3 mm-thick cushioning material layer is provided on the outer periphery of a steel material having an outer diameter of 994 mm, and a covering material layer formed of concrete having a thickness of 25 mm is provided on the outer side thereof.

  When this covering material layer shrinks evenly in the circumferential direction, the circumferential length shrinks by about 3.14 mm. This means that the inner diameter (diameter) of the concrete layer is reduced by about 1 mm. Therefore, if the buffer material layer has a displacement absorption capacity of 0.5 mm, the concrete layer will not be affected by shrinkage and will not crack. Incidentally, the thickness of the buffer layer is compressed from 3.0 mm to 2.5 mm.

  On the other hand, like the concrete composite product 10c shown in FIG. 5, the core material 11 (steel pipe with a diameter of 600 mm and a length of 1.0 m) is coated with a covering material 13 (thickness 25 mm, ultrahigh strength fiber reinforced). In the case of a specimen directly coated with concrete (UFC), four axial cracks 16 (width of about 0.15 mm) were observed. In addition, the crack of the circumferential direction was not observed.

  In addition, as shown in FIG. 6, the composite material 10d shown in FIG. 6, a core material 11 (steel pipe having a diameter of 600 mm and a length of 3.0 m) and a covering material 13 (25 mm thick, high toughness cement composite material) In the case of the specimen directly coated with (ECC)), the direction of occurrence is not uniform, but axial cracks 16 and circumferential cracks 17 (both about 0.1 mm wide) are observed.

  On the other hand, as shown in FIG. 1, a heat insulating sheet including a buffer material 12 (1.5 mm thickness × 2 layers of inorganic foam) on the outer periphery of a core material 11 (steel pipe having a diameter of 600 mm and a length of 1.0 m). In the experiment in which the coating material 13 (25 mm-thick ultra-high strength fiber reinforced concrete (UFC)) was coated via), neither cracks in the axial direction nor the circumferential direction were observed on the surface of the coating material 13.

  This is because the cushioning material 12 can absorb the displacement in the circumferential direction of the coating material 13 (shrinkage deformation due to self-shrinkage and drying shrinkage), and the coating material 13 on the surface of the cushioning material 12 extends in the length direction (steel pipe axis direction). It seems that axial displacements (shrinkage deformation due to self-shrinkage and drying shrinkage) can be absorbed by imparting the property of slipping or elastically deforming.

  INDUSTRIAL APPLICABILITY The present invention can be used for a concrete composite product having a composite structure in which the outer periphery of a core material is covered with ultra high strength fiber reinforced concrete (UFC), high tough cement composite material (ECC), or the like.

It is sectional drawing which shows one Embodiment of the concrete composite product which concerns on this invention. It is process drawing which shows the manufacturing process of a concrete composite product same as the above, (a) is a perspective view which shows a core material, (b) is a perspective view which shows the state which wraps the buffer material processed into the sheet form, (c) is concrete The perspective view which shows the state which shape | molded the coating | covering material by (d) is a perspective view which shows the state which provided the protective material in the surrounding surface of the coating | covering material. It is a side view which shows the construction example of a concrete composite product same as the above. It is sectional drawing which shows the example which constructed the concrete composite product same as the above in the multilayer container. It is a perspective view which shows the 1st test example of the conventional concrete composite product. It is a perspective view which shows the 2nd test example of the conventional concrete composite product.

Explanation of symbols

10 Concrete composite products
11 Core
12, 12a cushioning material
13, 13a Coating material

Claims (4)

A core material,
A cushioning material that absorbs the amount of concrete shrinkage provided on the peripheral surface of the core material;
A concrete composite product comprising: a covering material formed of concrete on a peripheral surface thereof through the cushioning material. The concrete composite product according to claim 1, wherein the covering material is any one of ultra high strength fiber reinforced concrete, high toughness cement composite material, fiber mixed concrete, polymer cement concrete and polymer concrete. The concrete composite product according to claim 1 or 2, wherein the cushioning material is a material that can be applied or adhered with elasticity or plasticity. The concrete composite product according to any one of claims 1 to 3, wherein a peripheral surface of the covering material formed of concrete is further covered with another covering material via another buffer material.

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