JP3528083B2 - Planar body for detecting distortion and method of manufacturing the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet for detecting strain.

[0002]

2. Description of the Related Art Conventionally, an optical fiber is attached along a wall surface of a tunnel, and a change in strain of the optical fiber due to a positional deviation of the wall surface is detected to detect a wall surface abnormality.

[0003]

<A> The present invention is to provide a planar body capable of detecting strain. <B> The present invention also provides a planar body capable of detecting strain that can be used in civil engineering work.

[0004]

According to the present invention, in a sheet-like body for detecting a strain at a predetermined position, the sheet-like body is formed in a lattice shape composed of a vertical member and a horizontal member. The optical fiber is arranged inside the sheet material, and the entire circumference of the optical fiber is
A planar object for detecting strain, which is characterized in that a planar material is melted and coated to measure a strain amount and a position of an optical fiber, and a strain at a predetermined position of the planar object is measured. The present invention also provides a planar body for detecting strain at a predetermined position, wherein the planar body is formed in a grid shape composed of a vertical member and a horizontal member, and a reinforcing wire is provided inside the vertical member or the horizontal member. arrangement, and the optical fiber is arranged along at least a portion of the reinforcing wires, optical fiber
The entire circumference of the bar is covered by melting the planar material, the strain amount and position of the optical fiber is measured, and the strain at a predetermined position of the planar body is measured. In a state. The present invention is also a planar object for detecting strain, wherein the planar object is a reinforcing material, a drainage material, a civil engineering sheet, a filter, or a water blocking sheet. On the body. The present invention also relates to a method of manufacturing a planar body for detecting strain, in which a planar material is melted to form an optical fiber in the molten planar material when the planar body is formed in a lattice shape. Insert it and place it in the grid of the
Characterized in that the entire circumference of the iva is coated with a sheet material ,
It is in a method for manufacturing a planar body that detects strain. The present invention also relates to a method of manufacturing a planar body for detecting strain, in which a planar material is melted to form an optical fiber in the molten planar material when the planar body is formed into a lattice shape. Insert the reinforcing wire and place it in the lattice of the planar body, and cover the entire circumference of the optical fiber with the planar material.
And a method of manufacturing a sheet for detecting strain, which is characterized in that the sheet is coated with.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

<A> Sheet-like body capable of detecting strain A sheet-like body capable of detecting strain is one in which an optical fiber is incorporated into a sheet-like body or is coated with a sheet-like material, and strain is imparted to the optical fiber. By doing so, it is a planar one whose distortion can be detected. By incorporating the optical fiber into a sheet or covering the sheet with a sheet material, the optical fiber can be easily attached to the object to be measured and the strain of the object to be measured can be measured.

When the optical fiber is incorporated in the planar body or coated with the planar material, the optical fiber is fixed to the planar body, so that the force applied to the planar body is directly applied to the optical fiber,
The distortion of the measured object can be better detected.

An optical fiber detector is attached to an optical fiber arranged on a sheet as shown in FIG. When a force is applied to a planar body capable of detecting strain and a strain occurs at a predetermined portion of the optical fiber, the optical fiber detection device can measure the position of the predetermined portion and the amount of strain. As the optical fiber detection device, for example, "BOTDR" (manufactured by Ando Electric Co., Ltd.) can be used.

<B> Sheet-like body The sheet-like body has an object in two or more directions, and is formed of a thread-like material such as a lattice-like one having a space in the middle, a net, a woven fabric, a knitted fabric or a non-woven fabric. It refers to the ones that come in the shape of a plate or plate. In addition to the purpose of detecting strain, the sheet-like object is, for example, a material for civil engineering such as a reinforcing material, a drainage material, a civil engineering sheet, a filter, and a water blocking sheet, which is used for civil engineering work. The sheet may be a square or a rectangle, or a strip having a short side and a long side. As the sheet material for civil engineering, polyethylene, aramid, carbon or glass, as long as the material can be used as a civil engineering material,
It can be anything.

<C> Lattice-shaped planar body As a planar body capable of detecting strain, FIG. 2 shows a lattice-shaped planar body used as a reinforcing material. The lattice-shaped planar body shown in FIG. 2 is made of polyethylene, for example, and is formed of a lattice composed of vertical members and horizontal members. A reinforcing wire such as aramid fiber, carbon fiber or glass fiber is put into one of the vertical member or the horizontal member to increase the strength. The optical fiber is mounted so as to be arranged at a necessary position for detecting the strain of the sheet. Figure 2
In the lattice-shaped planar body, the optical fiber is arranged on a specific longitudinal member together with the reinforcing wire. The optical fiber and the reinforcing wire are fixed in the planar body by being covered with the material of the planar body when they are arranged in the planar body as needed.

<D> Reticulated planar body As a planar body capable of detecting strain, FIG. 3 shows a reticulated planar body used as a reinforcing material. The mesh-like planar body of FIG. 3 is obtained by, for example, interweaving polyester fibers and aramid fibers,
Aramid fibers are woven in both strides. An optical fiber is woven and arranged at a specific position of the longitudinal or transverse fiber. This makes it possible to observe the strain at a specific place together with the reinforcing material.

<E> Use of sheet-shaped body capable of detecting strain FIG. 4 shows a state in which a sheet-shaped body capable of detecting strain is laid on the embankment as a reinforcing material. In the case of a lattice-shaped reinforcing material, soil enters the space between the lattices, restrains the soil to prevent the embankment from slipping, and the movement of the soil exerts a tensile force or a contracting force at a predetermined position of the lattice. As a result, the optical fiber at the predetermined position is distorted.

Therefore, by attaching an optical fiber strain detector to the optical fiber and measuring it, it is possible to observe where in the embankment the soil is displaced. Further, by disposing a sheet-like body capable of detecting strain in a layered manner on the embankment, the strain of the entire embankment can be observed.

The sheet-like body capable of detecting the strain acts as a reinforcing material in FIGS. 2 and 3, but in addition, the sheet-like body made of a material for civil engineering such as a drainage material, a civil engineering sheet, a filter, and a water blocking sheet. With these, it can be used as a strain gauge together with these functions.

The sheet-like body capable of detecting the strain is, in addition to the embankment,
It can be placed in various types of civil engineering works such as tunnels, levees, and dams to observe the state of distortion.

<F> Manufacturing method for arranging optical fiber in sheet-like body The molten sheet-like body material housed in the container is formed into a sheet-like body in the forming section as shown in FIG. To be At this time, the optical fiber is supplied to the forming unit, covered with the sheet material, placed in the sheet body, and wound.
In the forming part, the sheet-like body is formed into a lattice shape as needed. In addition, a reinforcing wire such as aramid fiber is also supplied to the forming part like an optical fiber in order to increase the strength of the sheet, if necessary, covered with the sheet material, placed in the sheet, and wound. Taken. In the case of a net, a woven fabric, or a knitted fabric, the sheet material is formed into a net, a woven fabric, or a knitted fabric, and an optical fiber is woven into a part thereof.

[0017]

According to the present invention, the following effects can be obtained. <A> In the present invention, since the optical fiber is incorporated in the planar body, it can be easily attached to the object to be measured. <B> Further, since the present invention incorporates an optical fiber into a civil engineering material, it can be used as a strain sensor as well as the function of the civil engineering material. <C> Further, according to the present invention, since the civil engineering material is fixed to the object to be measured with a planar body, the strain of the object to be measured can be accurately measured.

[Brief description of drawings]

FIG. 1 is an explanatory view of a planar body capable of detecting strain and an optical fiber strain detection device.

FIG. 2 is an explanatory view of a planar body that can detect lattice-like distortion.

FIG. 3 is an explanatory diagram of a planar body capable of detecting a mesh distortion.

FIG. 4 is an explanatory diagram in which a sheet-like body capable of detecting distortion is arranged on the embankment.

FIG. 5 is an explanatory view of manufacturing a planar body capable of detecting lattice-shaped distortion.

[Explanation of symbols]

1. A sheet that can detect distortion 11 ... Horizontal material 12 ... Vertical material 13 ... Reinforcing wires 14 ... Sheet material 2 ... Optical fiber 21 .. Optical fiber strain detector 3 ... Embankment 4 ... Container 41..Forming part

─────────────────────────────────────────────────── --Continued from the front page (56) References JP-A-2002-70015 (JP, A) JP-A-2000-193427 (JP, A) JP-A-63-208748 (JP, A) JP-A-6-102110 ( JP, A) JP 62-231142 (JP, A) JP 8-158260 (JP, A) JP 4-297611 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01B 11/00-11/30 G01D 21/00

Claims (5)

(57) [Claims] 1. A planar body for detecting strain at a predetermined position, wherein the planar body is formed in a grid shape composed of vertical members and horizontal members, and the optical fiber is provided inside the grid-shaped planar material. Is arranged, the entire circumference of the optical fiber is coated by melting the planar material, the strain amount and position of the optical fiber is measured, and the strain at a predetermined position of the planar body is measured, A sheet that detects strain. 2. A planar member for detecting a strain at a predetermined position, wherein the planar member is formed in a grid shape composed of a vertical member and a horizontal member, and a reinforcing wire is arranged inside the vertical member or the horizontal member. Then, the optical fiber is arranged along at least a part of the reinforcing wire, and the entire circumference of the optical fiber is covered by melting the planar material, and the strain amount and position of the optical fiber are measured to determine the predetermined area of the planar body. A planar object for detecting strain, which is characterized by measuring the strain at the position. 3. A planar body for detecting strain according to claim 1, wherein the planar body is a reinforcing material, a drainage material, a civil engineering sheet, a filter, or a water blocking sheet. The feature is a planar body that detects distortion. 4. A method for manufacturing a sheet-shaped body for detecting strain, wherein when a sheet-shaped material is melted to form a sheet-shaped body in a lattice shape, an optical fiber is inserted into the sheet-shaped material that is melted. And then disposing the sheet in a lattice of the sheet, and covering the entire circumference of the optical fiber with the sheet material . 5. A method for manufacturing a sheet-like body for detecting strain, wherein when the sheet-like body material is melted to form a sheet-like body in a lattice pattern, the molten sheet-like body material is reinforced with an optical fiber. A method for manufacturing a planar body for detecting strain, which comprises inserting a wire and arranging it in a lattice of the planar body, and covering the entire circumference of the optical fiber with the planar material .