JP6663637B2 - Sheet body with excellent fixability to concrete - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a sheet body having excellent bonding and fixing property (attachment property) to concrete, and more specifically, a sheet in which a reinforcing thread is fixed by a loop thread and having excellent bonding and fixing property to concrete (adhering property). About the body.

At present, molded articles with enhanced bonding and fixing properties (attachment property) to concrete are being developed.
For example, there is a joining technique in which cement paste is solidified while penetrating the nonwoven fabric (Patent Literature 1), which utilizes the action of retaining concrete before the nonwoven fabric is hardened.

  In addition, the fiber sheet is a fiber sheet having a high bonding property to concrete, comprising a first fiber sheet (a knitted fabric or a woven fabric) and a second fiber sheet (nonwoven fabric 1) attached to the first fiber sheet. There is a fiber sheet in which fibers penetrate the first fiber sheet and protrude outward from the surface of the first fiber sheet (Patent Document 2).

This has the advantage that the protruding part is embedded in the concrete, resulting in a large pull-out resistance.
Furthermore, there is a technique in which a large number of fixing loops protrude from the surface of a woven fabric as a sheet and are embedded in concrete to increase the bonding strength (Patent Document 3).

Each of the above-described techniques is used, for example, for joining and fixing a block and a mat in a concrete block mat such as revetment work.
When a concrete block mat is used at a construction site, it is lifted by a crane or the like, so that the block may peel off from the mat due to its weight.
The danger of the block falling must be avoided by all means.

  The above-mentioned technology is simply devised to provide a protruding part for embedding in concrete in the sheet, and since the number of protruding parts is limited, it is not necessarily sufficient from the viewpoint of joint fixing strength Was not.

JP-A-6-339910 JP 2011-26759 A JP-A-57-81510

The present invention has been made based on the conventional background art, and has been made to overcome the conventional problems.
That is, the present invention provides a sheet body having excellent fixability (adhesion) to concrete.

  Thus, the present inventor has conducted intensive studies on such a background of the problem, and as a result, by adding a reinforcing yarn to the sheet body and further attaching it using a loop thread, a part of the structure of the sheet body is reduced. The present inventors have found that the pull-out resistance is increased by being sandwiched between the reinforcing yarn and the loop yarn, and the present invention has been completed based on this finding.

That is, the present invention provides (1) concrete in which short fibers 1A of a sheet body A which is excellent in bonding and fixing to concrete, made of short fibers and has longitudinal reinforcing yarns 2Y and transverse reinforcing yarns 2X on one surface are embedded in the concrete. A sheet body A to which a surface opposite to the longitudinal reinforcing yarn 2Y is bonded and fixed to the block B. The sheet body A is made of a nonwoven fabric 1 in which short fibers 1A are entangled. The reinforcing yarn 2Y and the horizontal reinforcing yarn 2X are fixed, the vertical reinforcing yarn 2Y is fixed by a loop yarn 3, and the loop yarn 3 is wound around the longitudinal reinforcing yarn 2Y while the nonwoven fabric 1 is wound. And the short fibers 1A constituting the nonwoven fabric 1 are present in the sheet body A sandwiched between the longitudinal reinforcing yarn 2Y and the loop yarn 3.

1) Since the sheet A of the present invention is made of the nonwoven fabric 1 and the reinforcing yarn 2 is fixed to the nonwoven fabric 1 by the loop yarn 3, the short fibers 1A constituting the nonwoven fabric 1 as the sheet A are made of the reinforcing yarn 2 And the loop yarn 3.
Therefore, the strength of the nonwoven fabric 1 itself is improved, and the short fibers 1A constituting the nonwoven fabric 1 exhibit pull-out resistance, so that excellent bonding and fixing properties (attachability) can be obtained even when embedded in concrete.

2) Since the loop yarn 3 is woven in the nonwoven fabric 1 while being wound around the reinforcement yarn 2, the reinforcement yarn 2 is firmly attached to the nonwoven fabric 1.
In addition, the fibers of the nonwoven fabric 1 are easily entangled around the reinforcing yarn 2, and the bonding and fixing (adhesiveness) are further enhanced.

  3) Since the reinforcing yarn 2 is composed of the vertical reinforcing yarn 2Y and the horizontal reinforcing yarn 2X, the strength of the nonwoven fabric 1 in the vertical direction and the horizontal direction is increased.

  4) Since the intersection K between the vertical reinforcing yarn 2Y and the horizontal reinforcing yarn 2X is joined by the loop yarn 3, the arrangement state of the vertical reinforcing yarn 2Y and the horizontal reinforcing yarn 2X is stabilized, and the short fibers 1A of the nonwoven fabric 1 Is entangled with the intersection K, whereby the effect of joining and fixing is further improved.

  5) The sheet A is fixed to the concrete block B and used as a concrete block sheet for civil engineering.

FIG. 1 is a perspective view schematically showing the front side of the sheet body of the present invention. FIG. 2 is a perspective view schematically showing the back side of the sheet body of the present invention. FIG. 3 is a plan view schematically showing an enlarged part of the front side of the sheet member of the present invention. FIG. 4 is an enlarged plan view schematically showing a part of the back side of the sheet body of the present invention. FIG. 5 is a diagram schematically showing an enlarged part of a cross section of the sheet body of the present invention. FIG. 6 is a view schematically showing a knitting section of a warp knitting machine. FIG. 7 is a diagram schematically showing an example in which the sheet body A of the present invention is applied to a concrete block sheet. FIGS. 8A and 8B are enlarged schematic views of a joint structure between a concrete block and a sheet body. FIG. 8A is a state before the sheet body is pulled, and FIG. 8B is a state after the sheet body is pulled. Is shown. FIG. 9 is an enlarged photograph (3x) showing the state of the front side of the concrete block sheet. FIG. 10 is an enlarged photograph (3 ×) showing the state of the front side of the concrete block sheet of FIG. 1 in which the concrete block and the sheet body are forcibly peeled off. FIG. 11 is an enlarged photograph showing an example of a state after the concrete block and the sheet body have been peeled off in the peeling test.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view schematically showing the front side of the sheet body A of the present invention, and FIG. 2 is a perspective view schematically showing the back side of the sheet body A of the present invention.
Such a sheet body A has extremely excellent bonding and fixing properties (attachability) to concrete.

  FIG. 3 is a plan view schematically showing an enlarged part of the front side of the sheet body A of the present invention, and FIG. 4 is an enlarged schematic view showing a part of the back side of the sheet body A of the present invention. FIG.

The sheet body A has a base made of a nonwoven fabric 1, and a reinforcing thread 2 is provided along the nonwoven fabric 1.
The reinforcing yarn 2 is provided only along one surface (the back surface) of the nonwoven fabric 1 and includes a vertical reinforcing yarn 2Y and a horizontal reinforcing yarn 2X.

Since the reinforcing yarn 2 reinforces the nonwoven fabric 1, a filament yarn or a multifilament yarn is preferably employed.
As shown in the figure, the intersection angle between the intersection K of the vertical reinforcing yarn 2Y and the horizontal reinforcing yarn 2X is 90 degrees.
The loop yarn 3 is for attaching these reinforcing yarns 2 to the surface of the nonwoven fabric 1, and is specifically woven into the nonwoven fabric 1 while winding around the reinforcing yarns 2.

FIG. 5 is a diagram schematically showing an enlarged part of a cross section of the sheet body A of the present invention.
Here, the nonwoven fabric 1 is formed by intertwining many short fibers 1A (see the short fibers 1A in FIG. 8), and the short fibers 1A are sandwiched between the reinforcing yarn 2 and the loop yarn 3 (gripping action). .
This utilizes the fact that the short fibers 1A are entangled when the reinforcing yarn 2 is woven into the nonwoven fabric 1 with the loop yarn 3 using a warp knitting machine.
By this gripping action, the pull-out resistance of the sheet body against the concrete is exerted.

FIG. 6 is a view schematically showing a knitting section of a warp knitting machine.
It can be understood that the vertical reinforcing yarn 2Y is wound by the loop yarn 3 and woven into the nonwoven fabric 1.
When the loop yarn 3 is wound in this manner, the short fibers 1A of the nonwoven fabric 1 are sandwiched between the loop yarn 3 and the vertical reinforcing yarn 2Y.
Here, at the intersection of the vertical reinforcing yarn 2Y and the horizontal reinforcing yarn 2X, the vertical reinforcing yarn 2Y and the horizontal reinforcing yarn 2X are connected by the loop yarn 3, so that the vertical reinforcing yarn 2Y and the horizontal reinforcing yarn 2X are connected. The arrangement state is stable without being separated from each other.

The sheet body A of the present invention has the above-described structure, and the nonwoven fabric 1 itself has increased tensile strength in the vertical and horizontal directions by the reinforcing yarn 2 (2X, 2Y), and the short fibers constituting the nonwoven fabric 1 Since 1A is strongly sandwiched between the loop yarn 3 and the reinforcing yarn 2, the sandwiched short fiber 1A exhibits a suitable pull-out resistance.
By utilizing the characteristics of these sheet members A, various products in combination with other members can be realized.
As one of them, there is an example applied to a concrete block sheet.
This concrete block sheet is formed by joining and fixing a sheet body A to the bottom surface of a concrete block B.

FIG. 7 is a diagram schematically showing an example in which the sheet body A of the present invention is applied to a concrete block sheet.
In the sheet body A made of the nonwoven fabric 1, the reinforcing yarn 2 is fixed by a loop yarn 3, and the loop yarn 3 is woven into the nonwoven fabric 1 while winding around the reinforcing yarn 2.

FIG. 8 is an enlarged view schematically showing a joint structure between the concrete block and the sheet body A. FIG. 8A shows the state before the sheet body is pulled, and FIG. Shows the state after pulling.
For convenience, only one short fiber 1A is indicated by a broken line.
The short fibers 1A constituting the nonwoven fabric 1 are buried in the concrete block B, and have a bonding strength with concrete.
Therefore, as the short fibers 1A are harder to be pulled out, the bonding strength is increased.
The short fibers 1A are also entangled with the short fibers 1A constituting the same nonwoven fabric 1, but a part thereof is strongly sandwiched between the loop yarn 3 and the reinforcing yarn 2 (2Y). 1A further exerts pull-out resistance.

  As described above, since a part of the short fiber 1A constituting the nonwoven fabric 1 is strongly sandwiched between the loop yarn 3 and the reinforcing yarn 2, even if it is attempted to be pulled out together with the concrete block B, it exerts a resistance and the joining strength is reduced. It is growing.

FIG. 9 is an enlarged photograph (3x) showing the state of the front side of the concrete block sheet.
The sheet body A of the concrete block sheet in this case is an example in which the loop yarn 3 is wound along the vertical reinforcing yarn 2Y, but is not wound along the horizontal reinforcing yarn 2X.
Here, polyester is adopted as the material of each reinforcing thread and the nonwoven fabric 1.

FIG. 10 is an enlarged view (3 times) showing a state of the front side of the concrete block sheet of FIG. 1 in which the concrete block and the sheet body A are forcibly peeled off.
As for the short fibers 1A of the nonwoven fabric 1 sandwiched between the longitudinal reinforcing yarn 2Y and the loop yarn 3, it is visually recognized that the short fibers 1A remain along the longitudinal reinforcing yarn 2Y.
This is due to the gripping action described above.

  For reference, FIG. 11 is an enlarged photograph showing an example of a state after peeling of the concrete block B and the sheet body A in the peeling test.

On the other hand, since the transverse reinforcing yarn 2X does not include the loop yarn 3, the short fiber 1A hardly remains.
In order to manufacture the concrete block sheet described above, a ready-mixed concrete input step of putting ready-mixed concrete into the prepared formwork, a leveling step of leveling the surface of the ready-mixed concrete placed in the formwork horizontally, and a ready-mixed concrete placed in the formwork It is manufactured through a sheet laying step of laying the above-described sheet body A on the sheet and a curing step of curing the ready-mixed concrete put into the mold.

At this time, for example, a ventilation structure having a three-dimensional structure is placed on the sheet body A placed on the ready-mixed concrete placed in the mold, and a load member is placed on the ventilation structure. However, curing the ready-mixed concrete in that state is suitable in terms of efficiency.
That is, until the curing of the ready-mixed concrete is completed, the sheet body A is always kept in a state of being pressed against the ready-mixed concrete, so that it is firmly connected to the concrete block.

  Although the present invention has been described above, the present invention is not limited to only the above-described embodiment, and needless to say, other various modifications are possible without departing from the essence of the present invention. .

For example, as the non-woven fabric 1 constituting the above-described sheet body A, various non-woven fabrics can be adopted as long as the non-woven fabric 1 has a form in which the short fibers 1A are entangled by needle punching.
The loop yarn 3 may be a spun yarn in addition to the filament yarn.
In addition, since the reinforcing yarn reinforces the nonwoven fabric 1, a non-monofilament yarn or a multifilament yarn can be used.

The sheet body of the present invention is characterized in that a reinforcing yarn is fixed to a nonwoven fabric by a loop yarn. Short fibers constituting the nonwoven fabric have a high resistance to pulling out, and thus are fixed and bonded to concrete (adhesiveness). Is better.
Therefore, in addition to the concrete block sheet, any material having a joint surface with concrete can be applied, and its application range is wide.

DESCRIPTION OF SYMBOLS 1 ... Nonwoven fabric 1A ... Short fiber 2 ... Reinforcing thread 1A ... Intellectual fiber
2Y ... vertical reinforcing yarn
2X Horizontal reinforcement yarn 3 Loop yarn A Sheet body B Concrete block K Intersection

Claims (1)

Excellent bonding and fixing to concrete, short fibers made of short fibers and having longitudinal reinforcing yarns and horizontal reinforcing yarns on one side The short fibers of the sheet body are embedded in the concrete, and the surface opposite to the vertical reinforcing yarns is bonded and fixed to the concrete block A sheet body, wherein the sheet body is made of a nonwoven fabric in which short fibers are entangled, and a vertical reinforcing yarn and a horizontal reinforcing yarn are fixed to one surface of the nonwoven fabric, and the vertical reinforcing yarn is a loop yarn. It is fixed, the loop yarn is knitted into the non-woven fabric while winding around it along the vertical reinforcing yarn, and the short fibers constituting the non-woven fabric are sandwiched between the vertical reinforcing yarn and the loop yarn. A sheet body characterized in that:

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