JP2010053487A - Woven fabric for preventing concrete exfoliation, and method for preventing concrete exfoliation by using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fibrous woven fabric not preventing the concrete exfoliation itself of a concrete structural material, but preventing the fall of the exfoliated concrete blocks, and capable of sufficiently, visually and easily examining the concrete structure after the installation, and a method for preventing the exfoliation of the concrete structure by using the same. <P>SOLUTION: The woven fabric for preventing the concrete exfoliation includes a mesh-formed woven fabric using a strengthened fiber yarn having openings of ≥30% and <80% area, in which one of or both of the warp and weft yarns is covered with a low melting yarn as a sheath yarn, and heating after weaving melts the crossing points of the yarns for fusion bonding them with the sheath part to prevent the displacement of stitches. The fabric is used by attaching it to the surface of the concrete structure. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a reinforcing fabric used as a base material for preventing a concrete structure from peeling off, and particularly to a concrete peeling-off preventing fabric that is most suitable for being attached to the surface of a concrete structure by hand lay-up molding, and the same. The present invention relates to a method for preventing a concrete structure from peeling off.

  Recently, there has been an accident in which the concrete surface deteriorates due to the neutralization of concrete, and the concrete wall surface in the tunnel and the like is peeled off.

  And as a countermeasure, for example, a reinforcing method is adopted by adhering fiber reinforced plastic containing carbon fiber on the concrete surface, and it is widely used because it has a high reinforcing effect, excellent durability, and simple reinforcement work. Yes.

Since the fiber reinforced plastic is required to have a low-weight carbon fiber woven fabric, it becomes a very expensive woven fabric, and there is a problem that the cost of reinforcement work is increased.
On the other hand, when trying to obtain a fabric with a low basis weight using cheap thick carbon fiber yarn, it becomes a mesh fabric with a large weaving interval, so there is no restraining force due to the crossing of the warp and weft, and the handling property is poor with a very loose fabric. Further, there is a problem in that it cannot be adhered in a straight state, and the high strength cannot be sufficiently exerted, and the pasting work takes time.

In view of this, for example, in Japanese Patent Application Laid-Open No. 2001-226849, a reinforcing fabric in which warp yarns and weft yarns made of reinforcing fiber yarns are arranged in a mesh shape, and warp auxiliary yarns and weft auxiliary yarns are arranged between the arranged reinforcing fiber yarns. Has been proposed.
Further, a low-melting point thermoplastic polymer adheres to the auxiliary yarn, and is bonded at the intersection of the warp yarn and / or the weft yarn intersecting with the auxiliary yarn to obtain a binding force.

Furthermore, in JP-A-2002-348749, a plurality of reinforcing fiber yarns are arranged in parallel with each other in the length direction and the width direction, and have one or two or more openings. And the reinforcing fiber yarns in the width direction are fixed to each other with a sealant.
JP 2001-226849 A JP 2002-348749

  The purpose of this type of conventional fiber sheet is to focus on the repair of the peeled surface and to cover the concrete surface completely to prevent re-peeling, which hinders visual inspection of the structure after construction. However, in the above-mentioned 2002-348749, an opening is formed to cope with it, but a full and sufficient opening cannot be obtained.

  Therefore, the present invention aims to prevent the falling of the peeled concrete lump, not to prevent the concrete peeling itself of the concrete structure itself, and a fiber that can sufficiently perform a visual inspection of the concrete structure even after construction. It is an object of the present invention to provide a fabric and a method for preventing a concrete structure from peeling off using the fabric.

  The fabric for preventing concrete exfoliation according to claim 1 of the present invention is a mesh-like fabric using reinforcing fiber yarns, the area of the opening is 30% or more and less than 80%, and one or both of the vertical and horizontal yarns or both The yarn is covered with a low melting point yarn as a sheath yarn, heated after weaving, and fused with the melted sheath portion to prevent misalignment.

  The fabric for preventing concrete peeling according to claim 2 is characterized in that, in claim 1, the reinforcing fiber yarn is a basalt fiber yarn, and the fabric for preventing concrete peeling according to claim 3 is claimed in claim 1. Alternatively, in No. 2, the sheath portion is formed by double covering to prevent misalignment by heat fusion, and to improve the convergence of the yarn and the rigidity of the fabric.

  The invention of claim 4 is a method for preventing a concrete structure from peeling off, wherein the concrete peeling prevention fabric according to any one of claims 1 to 3 is applied to the surface of the concrete structure. is there.

  In the first aspect of the present invention, since the concrete peeling prevention woven fabric is a mesh-shaped woven fabric and the area of the opening is 30% or more and less than 80%, the concrete wall surface is completely penetrated through the mesh-shaped woven fabric. It has the effect of being able to obtain a highly reliable peeling prediction with a sufficiently visible effect.

Moreover, even if the area of the opening is wide, since it is a woven fabric using reinforcing fiber yarns, it can exert the effect of receiving the peeled concrete mass and preventing it from falling on the road etc. Fine pieces that pass through do not matter even if they fall.
And since one or both of the vertical and horizontal yarns are covered with the low melting point yarn as the sheath yarn, the crossing portion of the yarn of the fabric is fused by heat melting to strengthen the binding force and prevent misalignment. The core yarn has good convergence, prevents breakage, deterioration and fluffing, and exhibits the effect of reliably receiving the peeled concrete mass.

  In addition to the effect of claim 1, the invention of claim 2 has a commonality in material and physical properties with concrete because the reinforcing fiber yarn is a basalt fiber yarn, and in particular, selection of an adhesive during construction, It has the effect of avoiding problems of adhesion and expecting good adhesion.

  In addition to the effects of claims 1 and 2, the invention of claim 3 further enhances the effects of preventing misalignment, converging of the core yarn and preventing breakage, deterioration and fluffing, and imparts rigidity and good handling. The effect becomes.

  The invention of claim 4 can easily perform visual inspection of the concrete structure by using the fabric for preventing concrete peeling according to any one of claims 1 to 3 to contact the surface of the concrete structure. In addition, the concrete structure is prevented from peeling off, and the construction method has the effect of being easy and easy.

  The fabric for preventing concrete exfoliation of the present invention is a mesh-like fabric using reinforcing fiber yarns, and the area of the opening is 30% or more and less than 80%, and one or both of the longitudinal and lateral yarns are low melting yarns. Covering as a sheath yarn, heating after weaving, and fusing the intersecting portion of the yarn with the melted sheath portion to prevent misalignment.

Reinforcing fiber yarns can be obtained from, for example, basalt fiber, carbon fiber, aramid fiber, polyphenylene sulfide fiber, polyester fiber, polypropylene fiber, etc. In particular, basalt fiber is made of rock and has a common nature with concrete. There is good adhesion.
One or both of the warp and weft yarns of the reinforcing fiber yarn are covered with a low-melting yarn to form a low-melting yarn such as a low-melting nylon yarn.
Covering may be single or double, and in the case of double covering, the lashing direction should be different and the lashing should be doubled.

The weaving structure is preferably selected from plain weaving, imitation weaving or calami weaving so that the area of the opening is 30% or more and less than 80% in a mesh shape.
If it becomes 30% or less, the holding power of the concrete wall surface can be further strengthened, but the permeability from the opening is inferior and it becomes difficult to visually check the wall surface.
On the other hand, if it exceeds 80%, the visual inspection of the wall surface becomes easier, but the opening is too large and the holding power and strength of the concrete wall surface decrease, and if the thread is thickened to maintain strength, there is a problem in handling and economy. Occurs.

And after making it into a woven fabric, the crossing point of the woven yarn can be easily bonded by heating to a temperature equal to or higher than the melting point of the covered low melting yarn with a heater or the like.
Adhesion gives rigidity as a woven fabric, and the warp yarn is not bent or misaligned during handling of the woven fabric, so that the warp yarn is oriented straight and applied to the concrete wall surface. be able to.

Next, in order to improve the visibility, there is a method of applying an adhesive to the entire concrete wall and sticking the concrete peeling prevention fabric to the surface of the concrete structure to apply the concrete peeling prevention fabric to the surface of the concrete structure. A transparent adhesive is preferred.
Or, it can be anchored to the concrete wall, but if the anchor is inserted into the fiber sheet, there is a risk of misalignment. For example, an adhesive such as epoxy resin is applied to the counterbore. It is preferable to press the seat surface and tighten the nut.

Table 1 shows the results of the test by the flaking prevention punching test method, and is a test for evaluating the flaking prevention performance of the continuous fiber sheet adhesion used for measures against peeling of the concrete according to the standard set by the former Japan Highway Public Corporation.
Double core covering the core yarn with 90 tex count of basalt fiber yarn, 250 denier of polyester low melting fiber yarn (Unitika Ltd .: registered trademark) 250 denier, upper yarn is Z300t / m, lower yarn is S300t / m Using the woven yarn, weaving it with 3 pairs x 3 pairs of density / dimension 3 pairs (12 total) and 4 wefts (12 total) and heat melting the low melting fiber yarn A sheet fused at the intersection of the tissue was used.

Claims (4)

  A mesh-like woven fabric using reinforcing fiber yarns, the area of the opening is 30% or more and less than 80%, and one or both of the vertical and horizontal yarns are covered with a low melting point yarn as a sheath yarn, and after weaving A fabric for preventing concrete peeling, which is heated and fused with a melted sheath portion at the crossing portion of the yarn to prevent misalignment.   2. The fabric for preventing concrete from peeling off according to claim 1, wherein the reinforcing fiber yarn is a basalt fiber yarn.   3. The concrete peeling according to claim 1 or 2, wherein the sheath is formed by double covering with a low-melting yarn, prevents misalignment by heat fusion, and improves the convergence of the yarn and the rigidity of the fabric. Prevention fabric.   A method for preventing the concrete structure from peeling off, comprising applying the fabric for preventing concrete peeling according to any one of claims 1 to 3 to the surface of the concrete structure.