JP2003065760A - Method of optical measurement for pipe line and light path selective structure used for it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical measurement system in excavating work of a pipe line, etc., for preventing inner face of the pipe line from undesired reflection of lights for measurement to eliminate any risk of inability or error in measurement under a condition that light reflection is likely to be occurred when inner face of the pipe line gets wet. SOLUTION: In the method, a light path selective structure selecting only the shortest path among a plurality of light paths from a light-emitting source to an optical measuring machine is allocated inside the pipe line between the light-emitting source and the optical measuring machine. Thus effects of light reflection inside the pipe line from the light-emitting source is cleared off, allowing the optical measuring machine to surely collimate the light-emitting source.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for measuring the position information of tunnels such as tunnels and pipelines, or the position information of equipment such as excavators in tunnels and pipelines using optical means. It is about.

[0002]

2. Description of the Related Art Conventionally, in order to measure position information such as distance or slope of a pipeline buried in the ground, or position information of equipment such as an excavator in a tunnel or a pipeline, a straight line of light travels. A surveying system using sex is used. FIG. 7 illustrates a conventional surveying system. In FIG. 7, reference numeral 100 denotes a fume pipe buried in the ground, which is laid by, for example, sequentially propelling the ground by a propulsion method, and is constructed so that a predetermined pipeline is formed. 200 is an optical surveying instrument, and a light source 300
Is collimated, the positional information such as the gradient between the optical surveying instrument 200 and the light emitting source 300 is measured by the function of measuring the direction of the light emitting source 300. Light source
When 300 is installed in equipment such as an excavator, it is configured to measure position information of the equipment.

[0003]

However, in the conventional surveying system as described above, when the inner surface of the conduit is wet and light is easily reflected, the optical path indicated by the solid line is used. In addition, the reflection optical path shown by the broken line is established, and the light emission source 300 viewed from the optical surveying instrument 200 is not fixed, and there is a risk that measurement may be impossible or a measurement may be mistaken.

Therefore, the present invention has been made for the purpose of preventing unnecessary reflection of the measuring light on the inner surface of the conduit.

[0005]

[Means for Solving the Problems] Claim 1 according to the present invention
In the surveying method, the optical path selection structure for selecting only the shortest path of the plurality of optical paths from the light emitting source to the optical surveying instrument is provided in the conduit between the light emitting source and the optical surveying instrument. Thus, the influence of the reflection of light from the light emitting source by the inner surface of the pipe is eliminated, and the light emitting source is surely collimated by the optical surveying instrument. The optical path selection structure according to a second aspect is characterized in that it is formed by an antireflection member provided on the inner wall surface of the conduit. The antireflection member according to claim 3 is characterized in that the inner surface of the flexible sheet material elastically biased by the stretching method is formed in black. The optical path selection structure according to claim 4 is characterized in that it is formed by a perforated light shielding plate arranged so as to be orthogonal to the axis of the conduit.

[0006]

According to the method of claim 1, since the optical path selecting structure is arranged in the pipe, the light from the light emitting source does not follow a plurality of optical paths on the inner surface of the pipe, but only the shortest path. Is selected, the optical surveying instrument can reliably collimate the light emission source. According to the second aspect, since the antireflection member is provided on the inner wall surface of the conduit, it does not reflect on the inner wall surface, so that an unnecessary optical path is not formed. Since the antireflection member according to claim 3 is elastically biased in the extension direction, when the antireflection member is inserted into the duct in a rolled state and released, the antireflection member is stretched to be stuck to the inner surface of the duct. Become. Further, since the inner surface of the flexible sheet material attached to the inner surface of the conduit is formed in black, light reflection is prevented. According to the fourth aspect, since the perforated light shielding plate is arranged so as to be orthogonal to the axis of the conduit, only the optical path passing through the hole of the light shielding plate is selected. By installing a plurality of such perforated light shielding plates, unnecessary optical paths are eliminated.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION A surveying method according to the present invention will be described below in detail with reference to the drawings showing the embodiments thereof.

FIG. 1 shows an example of the configuration of a measuring system for measuring the position of a Hume pipe buried in the ground. In FIG. 1, reference numeral 1 denotes a fume pipe buried in the ground, which is laid by, for example, sequentially propelling the ground by a propulsion method, and is constructed so that a predetermined pipeline is formed. Reference numeral 2 is an optical surveying instrument, which has a function of measuring the direction of the light emitting source 3 by collimating the light emitting source 3 and by using the optical surveying instrument 2 and the light emitting source 3.
It is configured to measure the gradient and the like between and. In addition, when measuring the position of equipment such as an excavator that advances excavation at the head of the pipeline, the light emitting source 3 may be provided in the equipment such as the excavator. Instead of the light emitting source 3, it is also possible to use a reflecting mirror. In this case, the optical surveying instrument 2 needs to be equipped with a light emitting means.

Reference numeral 5 denotes an antireflection sheet which is a feature of the present invention, and is composed of a flat sheet which is flexible and has an appropriate elastic restoring force. As shown in FIG. 2, the antireflection sheet 5 is a sheet material 51 having a matte black paint applied to the surface thereof, and a rib portion 52 having elasticity formed on the sheet material 51. Is rounded as shown in FIG. 3 to give an elastic biasing force in the extension direction. Rolling in this way makes it easier to carry and store, and because it is biased in the extension direction, it is automatically extended to the inner surface of the pipe regardless of the diameter of the pipe. Can be made.

The antireflection sheet 5 is not limited to the structure shown in FIG. 2 and can have various structures. For example, a fabric may be provided with a frame made of an elastic wire material such as a piano wire so that it can be rolled or stretched. The elastic wire is not limited to metal or resin, but natural materials such as bamboo may be used. Then, instead of the matte black paint on the surface, various colors other than black may be applied, such as brown, as long as it is a color that hardly reflects light. Also, instead of paint, form fine irregularities on the surface,
A configuration that prevents reflection of light is also possible.

FIG. 4 is a view showing an embodiment of the optical path selection structure according to claim 4. In FIG. 4, two perforated light-shielding plates 6 are provided instead of the antireflection sheet 5 of FIG.
The perforated light-shielding plate 6 has, for example, a through hole 61 in the center thereof.
Are formed. Therefore, the light reflected on the inner surface of the conduit is blocked by the light shielding plate except for the optical path passing through the through hole 61. By disposing such two perforated light-shielding plates 6, optical paths other than the shortest path are excluded, and only the light on the shortest path is captured by the optical survey instrument 2. In this way, only the shortest path of the plurality of optical paths is selected, so that the optical surveying instrument 2 can reliably collimate and measure the light emitting source 3. The perforated light shielding plate 6 may be hung on the inner wall, or may be erected from the bottom surface or fixed to the wall surface. Also, the perforated light-shielding plate 6
May not be completely orthogonal to each other as long as the through hole 61 has a function of selecting an optical path even if it is slightly inclined with respect to the axis of the conduit. Further, the perforated light-shielding plate 6 is not a perfect plate body, and even if a gap is formed in the shape of goodwill, as long as it has an effective light-shielding property, the shape and material are not limited. When two light-shielding plates are used, as shown in FIG. 5, when the distance between the optical surveying instrument 2 and the light-emitting source 3 is L, the light-emitting source 3 and one light-shielding plate are separated from each other. The distance is L / 4, the distance between the two light shielding plates is L / 2, and the optical surveying instrument 2
It is advisable to set the distance between the other light shielding plate and L / 4 to L / 4.

Further, instead of the light shielding plate, a cylinder may be attached to the light emitting source side or the optical surveying instrument side. The optical path selection structure described above can be adopted in various surveying systems as long as it is arranged between the light emitting source and the optical surveying instrument. For example, even when the light emitting source is a reflecting mirror, the same effect can be obtained if it is configured to emit reflected light toward the optical surveying instrument.

Then, as shown in FIG. 6, laser beam type surveying devices 61, 62 and 63 having a mirror called a total station are arranged in a pipe line, and the laser beam type surveying device before and after is sequentially arranged. Is collimated, and based on the position information of the laser light type survey instrument 61 on the rear side serving as a reference, the position information of the laser light type survey instruments 62, 63 (or mirror 64) on the front side is sequentially determined The antireflection sheet 66 may be adopted in the automatic surveying system. In any system, it is natural that the system provided with the structure for preventing the reflection on the inner wall surface of the pipeline belongs to the scope of the claims of the present invention.

[0014]

According to the surveying method of the first aspect of the present invention, since only the shortest route is selected, reliable surveying can be performed even when the inner wall surface of the pipeline is easily reflected.
According to the second aspect, since unnecessary reflection is prevented by the antireflection member, reliable surveying is possible. According to the third aspect, it is possible to easily prevent reflection by extending the black flexible sheet material. According to the fourth aspect, since the optical path selection structure can be formed in a long conduit by using a plurality of perforated light shielding plates, the workability is excellent and the cost is low.

[Brief description of drawings]

FIG. 1 is an explanatory diagram for explaining a surveying method according to the present invention.

FIG. 2 is a perspective view of an antireflection member of the present invention in an extended state.

FIG. 3 is a perspective view of the antireflection member of the present invention in a rolled state.

FIG. 4 is an explanatory diagram of a surveying method using the perforated light shielding plate of the present invention.

FIG. 5 is an explanatory diagram of an arrangement example of perforated light shielding plates of the present invention.

FIG. 6 is an explanatory diagram when applied to an automatic surveying system.

FIG. 7 is an explanatory diagram of a conventional surveying method.

[Explanation of symbols]

1 Hume pipes and pipes buried underground 2 Optical survey instrument 3 light source 5 Anti-reflection sheet 6 hole light shield

Claims (4)

[Claims] 1. A pipe between a light emitting source and an optical surveying instrument,
By arranging an optical path selection structure that selects only the shortest path of the plurality of optical paths from the light emitting source to the optical survey instrument, the influence of the reflection of light from the light emitting source by the inner surface of the conduit is eliminated, An optical surveying method for a conduit, characterized in that the light emission source is surely collimated by an optical surveying instrument. 2. The optical path selection structure used in the method according to claim 1, wherein the optical path selection structure is formed by an antireflection member provided on an inner wall surface of the conduit. 3. The optical path selection structure according to claim 2, wherein the antireflection member has a black inner surface of a flexible sheet material elastically biased by the stretching method. 4. The optical path selection structure used in the method according to claim 1, wherein the optical path selection structure is formed by a perforated light shielding plate arranged so as to be orthogonal to the axis of the conduit.