JP6305200B2 - Tensile member and manufacturing method thereof - Google Patents

Description

  The present invention relates to a tensile member having a stable load bearing capacity and a manufacturing method thereof.

  For example, in the fiber sheet of Patent Document 1, warp yarns and hot melt weft yarns are woven into a plain weave, and as shown in FIG. 1, warp yarns 10 are formed in a wavy shape between the weft yarns 11 and 11, and are provided in a flat string shape. It is used as a concrete hoisting material that is wound to reinforce pillars and beams of concrete structures.

Japanese Patent No. 3880721

  As shown in FIG. 3 (A) and FIG. 3 (B), the applicant of the present application wound the conventional fiber sheet a plurality of times in a loop shape, so that the cross-sectional configuration is a plurality of rows and a plurality of stages. When the loop structure 20 is formed from the above and a tensile force is applied in the length direction of the loop structure 20, the weft 11 is broken and, as shown in FIG. 4, in the load-displacement curve, the dotted line in FIG. It has been found that a section (hereinafter referred to as a shelf) 30 in which only the displacement increases without increasing the load, as shown by the curve A, appears. As shown in FIG. 1, in the process in which the warp yarn 10 extends from a wave shape to a straight shape, the weft yarn 11 is sheared and broken by the warp yarn 10, and the weft yarn 11 is broken, thereby restraining the warp yarn 10. This is because the fiber sheet in the region extends in the length direction.

  Therefore, when the present applicant uses such a conventional fiber sheet, after forming the loop structure 20, the applicant applies a tensile force in the length direction to change the initial shape of the warp yarn 10 from a wave shape to a linear shape. Is going to do. However, when the fiber sheet forms the loop structure 20, the tensile force applied is different between the inner side and the outer side, and it is difficult to make the initial shape of the warp yarn 10 uniform from a wave shape to a linear shape. There is a risk of variation.

  The present invention has been made in view of the above-described problems, and eliminates a load-displacement curve shelf generated when a loop structure is formed, thereby suppressing a variation in tensile force. And it aims at providing the manufacturing method.

The method for producing a tension member according to the present invention includes a weaving step of weaving warp yarns and heat-meltable weft yarns, extending the warp yarns in the length direction in a straight line, and heating and melting the weft yarns to melt the straight lines. It possesses a molding step of integrating the Jo warp, in the weaving process, the said warp and said weft is woven in a plain weave, in the molding process, heated and melted in a state in which a tensile force to the warp direction has been given By doing so, the warp yarn is changed from a wave shape to a straight shape .

  Moreover, you may make it have further the coating process which provides a coating | covering material so that the said linear warp may be covered.

In the tension member according to the present invention, a plurality of linear warp yarns arranged in parallel in the width direction are provided in a line shape in the width direction of the warp yarn, and at a predetermined interval in the length direction substantially orthogonal to the width direction. The loop structure is integrated by a plurality of binders and wound in a loop shape a plurality of times .

  Moreover, you may make it further provide the coating | covering material which covers the said warp.

  The binder may be formed by melting the weft yarn.

  According to the present invention, after the warp and weft are woven, the warp is stretched and provided in a straight line, and the weft is heated and melted to disappear as a binder that integrates the warp, Shelves appearing in the load-displacement relationship that occurs when the loop structure is formed can be eliminated, variations in tensile force can be suppressed, and tensile strength and tensile rigidity can be improved.

It is the side view which showed the manufacturing method of the tension member. It is front sectional drawing which showed the tension member which provided the coating | covering material. (A) is the perspective view which showed the loop structure, (B) is sectional drawing which showed the loop structure. It is the graph which showed the load-displacement relationship of the tension member.

  Hereinafter, a tension member to which the present invention is applied and a manufacturing method thereof will be described in detail with reference to the drawings. In addition, this invention is not limited to the following examples, It can change arbitrarily in the range which does not deviate from the summary of this invention.

  The tension member 1 is provided in a string shape (flat string shape), a band shape, or an elongated cloth shape by weaving the warp yarn 10 and the weft yarn 11 into, for example, a plain weave. Such a tension member 1 is a member that receives a tensile force. For example, a suspension material, a traction material, a suspension material of a suspension scaffold, a catwalk (aerial scaffold), and a bridge girder are prevented from falling due to vibration such as an earthquake. Used as a connecting material that connects the bridge girder and pier of the falling bridge prevention device, concrete hoisting material wound to reinforce pillars and beams of concrete structures, ropes for safety belts, falling rock nets, reinforced earth walls, etc. It is done.

  Initially, the manufacturing method of the tension member 1 is demonstrated.

  First, as shown in FIG. 1, the tension member 1 is provided in a string shape (flat string shape), a belt shape, an elongated cloth shape, or the like, in which warp yarns 10 and weft yarns 11 are woven into a plain weave, for example.

  The warp yarn 10 is formed of fibers having at least high tensile strength and high heat resistance. Specifically, the warp 10 is formed of super fibers such as polyarylate fibers and polyamide fibers, petroleum fibers, and the like. The warp yarn 10 may be made of vegetable fibers in consideration of the environment in addition to super fibers and petroleum fibers. The weft 11 is formed of a heat-meltable fiber such as polyester or nylon (registered trademark) that is easier to dissolve than the warp 10. Further, since the warp yarn 10 is woven in a plain weave, the space between the weft yarns 11 and 11 is formed in a wave shape.

  Next, the tension member 1 having a wavy warp yarn 10 is heated at a predetermined temperature while being stretched in the length direction.

  Specifically, the tensile member 1 is pressed against a drum heated to a predetermined temperature while being applied with a predetermined tensile force, or a predetermined pressing force between a pair of rollers heated to a predetermined temperature. It is heated at a predetermined temperature while being stretched by applying a predetermined tensile force in the length direction, for example, by being sandwiched between the two. For example, the drum or roller heats the weft 11 to 80 ° C. or more, although it depends on the material of the weft 11.

  Thereby, the warp yarn 10 is extended by applying a tensile force in the length direction by a drum or a roller. At this time, the weft 11 is sheared from the warp 10 and is broken. Then, the warp yarn 10 is provided from a wavy shape to a straight shape in a process of being elongated in the length direction without being restricted by the weft yarn 11.

  Furthermore, since the weft 11 is formed of heat-meltable fibers, all or part of the weft 11 is melted by being heated by a drum or a roller. Then, the weft 11 integrates the warp 10 formed in a straight line. That is, the weft yarn 11 is melted and becomes a binder for integrating the warp yarn 10, and all or a part thereof disappears. Furthermore, since the weft 11 was originally woven into a plain weave, a plurality of juxtaposed yarns (line shapes) are provided in the width direction of the warp yarns 10 arranged in parallel, and a plurality of wefts 11 are provided at predetermined intervals in the length direction. It has been.

  As described above, the tension member 1 is manufactured. At this time, the tension member 1 is stretched by a drum or a roller so that the warp yarn 10 is provided in a linear shape from a wave shape, and the weft yarn 11 is melted while being broken by shearing from the warp yarn 10 and is melted by the melted weft yarn 11. The warp yarns 10 formed in a straight line are integrated. Furthermore, a plurality of weft yarns 11 are provided in the form of a line (line shape) in the width direction of the warp yarns 10 arranged in parallel, and a plurality of weft yarns 11 are provided at predetermined intervals in the length direction.

  The tension member 1 may be provided with a covering material 12 as shown in FIG. The covering material 12 is made of, for example, a material excellent in weather resistance, ultraviolet resistance, water resistance, etc., such as polyvinyl chloride. And the tension | tensile_strength member 1 is provided in an outer periphery so that the coating | covering material 12 may cover the tension | tensile_strength member 1 by extrusion-coating with a coating | coated apparatus etc. FIG. Further, the covering material 12 integrates the warp yarn 10 together with a binder in which the weft yarn 11 is melted in addition to protecting the tension member 1 from climate, ultraviolet rays, water and the like. Furthermore, since all or part of the inner peripheral surface melts and is welded to the tension member 1 when the covering material 12 is extrusion-coated, the warp yarns 10 are integrated more firmly.

  Next, a tensile test performed on a loop structure in which a tensile member is wound in a loop shape a plurality of times will be described.

  Specifically, as shown in FIGS. 3A and 3B, the tension member 1 is wound so that the flat string-like tension member 1 is wound a plurality of times in a loop shape so that the cross-sectional configuration becomes a plurality of rows and a plurality of stages. Then, a loop structure 20 was formed, and a tensile test was performed with a 200 t fatigue tester. The result is shown in FIG. The vertical axis in FIG. 4 indicates the load (kN) applied in the length direction of the loop structure 20, and the horizontal axis indicates the displacement (mm) in the length direction of the loop structure 20.

  The dotted curve A in FIG. 4 is plain woven using the product name “Vectran” (registered trademark), which is a high-strength polyacrylate fiber manufactured by Kuraray Co., Ltd., for the warp and the polyester fiber for the weft. . The solid curve B in FIG. 4 is plain woven and weaved using the product name “Vectran” (registered trademark), which is a high-strength polyacrylate fiber manufactured by Kuraray Co., Ltd., for the warp and polyester fiber for the weft. Later, the warp is melted by heating to bond the warp. That is, in the tension member of the curve A, the warp yarn is wavy in the initial state, and the tension member of the curve B is formed linearly (flat) simultaneously with heating. Therefore, in the initial state, the warp yarn is linear. It has become.

  Furthermore, the fiber amount of the test specimen was 4275200 dtex corresponding to a 400 kN product, and the fiber amount was adjusted to be the same at the number of winding rotations. The width of the tension member is 10 mm for the curve A tension member and 15 mm for the curve B tension member. Furthermore, the width of the test body was 80 mm for the test body of curve A and 120 mm for the test body of curve B.

  As apparent from FIG. 4, in the curve A, the shelf 30 in which only the displacement increases during loading is recognized. On the other hand, the curve B showed high tensile rigidity, was not partially broken during loading, reached the maximum load, and the shelf 30 was not recognized.

  As described above, in the tension member 1, the warp yarns 10 and the weft yarns 11 are woven into a plain weave, and then the warp yarns 10 are stretched to be provided in a straight shape from a wavy shape. At the same time, the weft 11 is heated and melted to disappear as a binder that integrates the warp 10, thereby eliminating the shelf 30 that appears in the load-displacement relationship that occurs when the loop structure 20 is formed. Thus, variations in tensile force can be suppressed, and tensile strength and tensile rigidity can be improved. Therefore, even if the loop member 20 is formed such that the tension member 1 is wound a plurality of times in a loop shape so that the cross-sectional configuration is a plurality of rows and stages, the tensile member 1 has a uniform load resistance, so A corresponding tensile force (strength) can be obtained.

  The tension member 1 is not limited to weaving the warp yarn 10 and the weft yarn 11 in a plain weave, and may be woven by other conventionally known weaving methods such as a twill weave.

1 tensile member, 10 warp, 11 weft, 12 covering material, 20 loop structure, 30 shelves

Claims (5)

A weaving process for weaving warps and hot melt wefts;
Provided linearly extending the warp in the longitudinal direction, by heating and melting the weft have a a molding step of integrating the linear warp,
In the weaving step, the warp and the weft are woven into a plain weave,
In the molding step, the warp yarn is changed from a wave shape to a linear shape by heating and melting in a state where a tensile force is applied in the warp yarn direction .   The method for producing a tensile member according to claim 1, further comprising a covering step of providing a covering material so as to cover the linear warp. A plurality of linear warp yarns arranged in parallel in the width direction are provided in a line shape in the width direction of the warp yarns, and a plurality of binders are provided at predetermined intervals in the length direction substantially orthogonal to the width direction. A tensile member characterized by being a loop structure that is integrated and wound a plurality of times in a loop shape . The tension member according to claim 3 , further comprising a covering material that covers the warp. The tensile member according to claim 3 or 4 , wherein the binder is obtained by melting the weft yarn.