JPH0611989B2 - Construction controllable civil engineering / construction sheet and construction management method using this sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention is used for so-called geotextiles, geomembrane sheets, or reinforcements for construction, which are used for surface treatment of soft ground, slope protection, water-blocking construction, etc. Regarding the seat, we propose a cloth-like sheet that can electrically detect the load weight applied to the seat mainly by heavy machinery, vehicles, etc. during the construction work and provide extremely useful information for the construction management. It is a thing.

<Prior art> As for the management technology for the construction of the cloth-like sheet that has been conventionally used for civil engineering or construction, observation of past construction experience and operating conditions of heavy machinery, vehicles, etc. during construction According to this method, the construction manager estimates the load applied to the seat and determines whether or not construction is possible. Currently, the construction management is carried out by the so-called “can” of human beings. However, since such a method depends on the “can” of the person in charge of construction, it is easy to make a mistake in judgment and there is a problem in safety management. On the contrary, in some cases, it is necessary to take extra consideration in safety, and in such a case, only a small machine or vehicle can be put in, and as a result, there is a problem that the construction period is unnecessarily extended.

<Problems to be Solved by the Invention> The present invention eliminates the conventional construction management based on the “can” of the construction manager and enables the measurement of the load weight applied to the seat.

<Means for Solving Problems> In order to solve the problems and enable measurement management, the present inventors drive conductive yarns as a part of the constituent yarns of the fabric sheet woven and knitted, and It is assumed that this conductive thread changes its conductivity in synchronism with the amount of strain that occurs due to breakage or load weight prior to the damage of other main body parts, and the electrical conductivity of this conductive thread is measured by a meter to perform construction. The present invention has been completed by finding that management becomes possible.

That is, the present invention relates to a civil engineering / construction sheet made of a woven or woven fabric, which has an electric resistance value of 1 Ω / m to 1000 KΩ / m, and a conductive yarn whose electric resistance value changes with a change in elongation strain of the sheet. It is a construction-controllable civil engineering / construction sheet (hereinafter sometimes simply referred to as a sheet) that is present in or on the sheet surface. More preferably, a part of the warp yarn or the weft yarn constituting the knitted fabric is an electrically conductive yarn, and the electrically conductive yarn has its electric resistance value changed in accordance with the change of the elongation strain amount, and further The elongation at break of this yarn is 10% or more and 95% or less with respect to that of the yarn of the other part. Further, it is more preferable that the yarn is covered with an electrically insulating resin, rubber or the like, or that the yarn is arranged at intervals of 5 cm or more and 3 m or less in one direction or two or more directions of the sheet.

And, as a construction management method using such a civil engineering / construction sheet, the present invention provides a sheet of electrical resistance as a construction method using a construction method in which a load is applied to the civil engineering / construction sheet made of a woven fabric. Value is 1Ω / m to 10
It is 00 KΩ / m, and the electric resistance of the conductive thread during construction is increased by using a sheet in which the conductive thread whose electric resistance value changes with the change of the elongation strain of the sheet exists inside or on the surface of the sheet. Civil engineering characterized by observing resistance and performing construction under the condition that the value is below a certain value
It is a construction management method in a construction method using a building sheet.

Here, the electric resistance value per 1 m length of the electrically conductive yarn, which is a feature of the present invention, is within the range of 1 Ω to 1000 KΩ.
This is because when the electrical conductivity is Ω or less, the change in the resistance value due to the change in the elongation strain is too small, which causes difficulty in achieving the object of the present invention, and conversely, when 1000 KΩ or more, there is a problem in measurement.

Further, the breaking elongation at the time of elongation is set to be 10% or more and 95% or less with respect to that of the yarn of the other portion, because the stress detection capacity is too small at 10% or less, and conversely at 95% or more, the other portion breaks. In some cases, the conductive yarn is not broken prior to the above, and therefore a larger change in the electric resistance value cannot be measured, which is not preferable in terms of management.

Furthermore, the reason why the insulating coating process with resin or rubber is preferable is to prevent the change of the electric resistance value due to the permeation of salt water, etc. This is because the physical properties of the sheet itself are impaired, and when the length is 3 m or more, the detection accuracy becomes rough, and it becomes difficult to achieve the purpose.

The conductive thread material of 1 Ω / m to 1000 KΩ / m, which is a feature of the present invention, is not particularly limited, and examples thereof include metal plating on organic fibers, plastic film or rubber, kneading with conductive carbon, or the like. It is possible to use a single item such as various fine metal wires and the like or a combination thereof. In addition, for the purpose of improving the knitting property, the composite of these conductive materials and organic or inorganic fiber materials does not impair the effect of the present invention.

The conductive yarn described in the present invention is not limited in terms of form and means not only general yarn cords but also tape-like other forms.

In the present invention, the main reason why the electric resistance value of the conductive yarn increases in accordance with the load weight applied to the sheet is that the fibers constituting the conductive yarn are stretched as the load weight is applied, and the fiber cross-sectional area is It becomes small, and as a result, the electric resistance value rises.

Regarding the denier of the conductive yarn, the types of constituent yarns other than the conductive yarn, the denier, and the basis weight and structure of the sheet, those similar to those used for ordinary geotextiles and geomembranes can be used.

FIG. 1 is a plan view of an example of a construction-controllable civil engineering and construction sheet according to the present invention, in which conductive yarns 4 are driven in two directions, that is, the longitudinal direction. FIG. 2 is a cross-sectional view of an example of the conductive yarn that constitutes the sheet of the present invention.
Is covered.

The present invention will be described below with reference to examples.

Example 1 The main yarn was 500 denier polyester filament yarn, and the conductive yarn had an electric resistance value of 1.
2KΩ / m thin metal wire and metal plated organic fiber 30
900 denier was obtained by using 0 denier yarn and coating the surface thereof with a polyester resin.

Using both of these, the driving density in the warp and weft directions is 25 each
A book / inch sack cloth was prepared. In this case, the conductive yarn had a density of 1/20 cm only in the warp direction.

Using this base cloth, a stress-strain amount automatic recording type tensile tester and an electric resistance measuring device were interlocked to measure the relationship between the stress and the electric resistance value.

The measurement results are shown in FIG. 3. From this relationship, it can be seen that the stress applied to the sheet can be detected by measuring the electric resistance of the conductive yarn of the present invention in practical use.

By using this sheet for the surface treatment of soft ground and monitoring the electrical resistance value, the load applied to the sheet could be grasped and managed reliably.

<Effects of the Invention> By using the civil engineering and construction sheet of the present invention and monitoring the electric resistance value thereof, the load applied to the sheet can be accurately grasped, and an accident due to overload and such an accident occur. It is possible to solve the problem that construction becomes inefficient and lengthened due to fear of doing so.

In particular, the sheet of the present invention is a surface treatment of a soft soil containing a large amount of water, that is, a sheet is laid on a soft soil, and a sheet used to remove soil on the soil by placing soil thereon, so-called. Suitable for soft ground surface treatment sheet.

[Brief description of drawings]

FIG. 1 is a plan view of an example of the sheet of the present invention.
1 is a warp yarn, 2 is a weft yarn, 3 is a normal yarn, and 4 is a conductive yarn. FIG. 2 is a cross-sectional view of an example of the conductive yarn that constitutes the sheet of the present invention. In the figure, 5 is a conductive yarn and 6 is an insulating coating layer. FIG. 3 shows the relationship between the tensile strength and the electric resistance value of the inventive sheet.

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Ichiro Hanamori 3-8-2 Nihonbashi, Chuo-ku, Tokyo Kuraray Co., Ltd. (72) Inventor Satoshi Sasaki 3-8-2 Nihonbashi, Chuo-ku, Tokyo Kuraray Co., Ltd. (72) Inventor Hiroshi Ogino 3-8-2 Nihonbashi, Chuo-ku, Tokyo Within Kuraray Co., Ltd.

Claims (6)

[Claims] 1. A civil engineering / construction sheet made of a woven or woven fabric having an electric resistance value of 1 Ω / m to 1000 KΩ / m,
A construction-controllable civil engineering / construction sheet, characterized in that a conductive thread whose electric resistance value changes according to a change in elongation strain of the sheet is present inside or on the sheet surface. 2. The civil / construction sheet according to claim 1, wherein a part of the warp or the weft is a conductive yarn. 3. The civil engineering work according to claim 1, wherein the conductive yarn has an elongation at break strain amount of 10 to 95% of the amount of elongation at break strain of other yarns constituting the sheet.・ Sheet for construction. 4. The civil / construction sheet according to any one of claims 1 to 3, wherein the conductive thread is covered with an electrically insulating resin or rubber. 5. A conductive yarn according to any one of claims 1 to 4, wherein the conductive yarns are present at substantially equal intervals in a range of 5 cm or more and 3 m or less with respect to one direction or two or more directions of the sheet. Civil and construction sheet described in crab. 6. When the civil engineering / construction sheet made of woven or woven fabric is constructed using a construction method in which a load is applied, the sheet has an electric resistance value of 1 Ω / m to 1000 KΩ / m.
That is, using a sheet in which the conductive yarn whose electric resistance value changes along with the change in the elongation strain amount of the sheet is present in the sheet or on the sheet surface, the electric resistance value of the conductive yarn during construction is A construction management method in a construction method using a civil engineering and construction sheet, which is characterized by observing and performing construction under a condition where the value is below a certain value.