JP2571048B2 - Surveying equipment for bending tunnel excavation - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surveying device for excavating a curved tunnel.

2. Description of the Related Art A surveying instrument (level gauge, total station, etc.) used for tunnel excavation is installed at a place away from the excavation point to avoid vibration and dust generated by the excavation. Cannot directly observe the excavation point. Therefore, surveying must be carried out while moving the installation site of the surveying instrument. In order to eliminate such means, various surveying methods have been proposed in which the observation light beam is refracted while refracting the observation light flux, but all require complicated devices. In addition, wedge prisms and reflecting mirrors can be considered for refraction of light beams.However, using a wedge prism has the disadvantage that the amount of light loss when the light beam enters the prism is large, and the refraction angle of the light beam is fixed by the prism. There is a problem. On the other hand, in the method using a single reflecting mirror, even if the installed reflecting mirror is slightly displaced due to external vibration or the like, the reflection angle of the light beam, that is, the deviation of the reflection angle is doubled, and both are practical obstacles. .

Problems to be Solved by the Invention The present invention solves the above-mentioned conventional problems, and provides a surveying device at the time of excavation of a curved tunnel which can perform accurate surveying with a simple operation. The purpose is to do so.

Means for Solving the Problems In order to achieve the above object, the present invention provides a surveying instrument for excavating a curved tunnel, in which a surveying instrument is installed separately from the excavation point, and the surveying instrument and the surveying instrument are installed. A double mirror composed of two reflecting mirrors facing each other at one or two or more tunnel bending points at a crossing angle is installed on a base, and the angle of one of the double mirrors can be rotated. The reflection angle of the laser beam can be changed by changing the angle of the mirror, and the excavation point is observed by the surveying instrument through the double mirror.

ADVANTAGE OF THE INVENTION According to this invention, even if it is a curved tunnel and a surveying instrument is installed in the position distant from the excavation point, since it is a crossing type forked reflector, it is possible to measure an excavation surface easily and accurately. . Since one of the cross-shaped bifurcated reflecting mirrors is rotatable, an adjusting means for changing the angle of the mirror is simple, the angle can be arbitrarily adjusted, and the reflection angle of the laser beam can be easily changed.

Further, since the incident angle and the outgoing angle are preserved due to the two-surface reflection, the positioning of the base does not take time.

Furthermore, since the two reflecting mirrors are mounted on one base, the angle is maintained even if the base moves due to vibration.

Examples Hereinafter, details of the present invention will be described with reference to the drawings. First
FIG. 1 is a schematic view showing one embodiment of the surveying method of the present invention, FIG. 2 is a diagram showing the arrangement of reflecting mirrors in a double mirror used in the present invention, and FIGS. 3 to 5 are diagrams for changing the angle of the double mirror. FIG. 3 is a diagram showing various embodiments.

As shown in FIG. 1, a surveying instrument, for example, a laser theodolite (2) is installed in a curved tunnel (1), and a tunnel curved surface between an excavation point or excavation surface (3) and the laser theodolite (2). Then, double mirrors (4a) and (4b), which are bifurcated and opposed at an angle where two reflecting mirrors cross each other, are installed. The reflecting mirrors (M1) and (M2) forming the respective double mirrors (4a) and (4b) are bifurcated to face each other at an angle at which they can cross each other, and the luminous flux shown by the arrow in FIG. When the intersection angle between the two reflecting mirrors (M1) and (M2) is (θ), the light is reflected at 2π−2θ. Therefore, the intersection angle (θ) between the two reflecting mirrors (M1) and (M2) of each of the double mirrors (4a) and (4b) installed according to the bending of the tunnel (1) is appropriately selected.
As shown in the figure, the excavation surface (3) is configured to be observed by a laser theodolite (2) using a laser beam traveling as shown by an arrow.

At this time, several types of double mirrors having various crossing angles (θ) are prepared, an appropriate double mirror can be selected and installed opposite to each other, or the crossing angle (θ) of the double mirror can be adjusted. To As means for changing the crossing angle of the double mirrors (M1) and (M2), as shown in FIG. 3, the mirrors (M1) and (M2) are respectively provided at the pace (1) and the mirror frame (2).
(3), the mirror frame (2) and / or (3) is rotatably mounted on the rotation shaft (5), and the upper part is inserted into several mounting holes (6) provided in the base (10). 7) or, as shown in FIG. 4, a mirror (M1) (M
One or both of the mirror frames (2) and (3) to which 2) is attached may be replaced. Furthermore, as shown in FIG. 5, the upper or lower side of one or both paces (22) and / or (23) is rotatably mounted by a shaft (5), and an elongated hole (8) is provided on the opposite side of the pivot. It may be provided and guided. (9) is a fixed shaft or a screw.

Effect of the Invention As described above, the present invention provides a curved tunnel, even if a surveying instrument is installed at a position away from an excavation point,
Since it is a cross-shaped bifurcated reflector, it is possible to easily and accurately measure the excavated surface. In addition, the members used are very simple and inexpensive, and are easy to handle. Since one of the cross-shaped bifurcated reflecting mirrors is rotatable, an adjusting means for changing the angle of the mirror is simple, the angle can be adjusted arbitrarily, and the reflection angle of the laser beam can be easily changed.

Further, since the incident angle and the outgoing angle are preserved due to the two-surface reflection, the positioning of the base does not take time.

Further, since the two reflecting mirrors are mounted on one base, the angle is maintained even if the base moves due to vibration, and the measurement is not affected.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing one embodiment of the surveying method of the present invention, FIG. 2 is a diagram showing the arrangement of reflecting mirrors in a double mirror used in the present invention, and FIGS. 3 to 5 change the angle of the double mirror. FIG. 3 is a diagram showing various embodiments for the present invention. (1) Bending tunnel (2) Laser theodolite (3) Drilling surface (4a) (4b) Double mirror (M1) (M2) Double mirror

Claims (1)

(57) [Claims] In a surveying device for excavating a curved tunnel, a surveying instrument is installed at a distance from the excavation point, and two surveying instruments are provided at one or more tunnel bend points between the excavating point and the surveying instrument. A double mirror formed by opposing the reflecting mirrors at an intersecting angle is installed on the base, and the angle of one mirror of the double mirror is configured to be rotatable, and the angle of the mirror is changed to change the angle of the mirror. A surveying instrument for excavating a curved tunnel, wherein the angle of reflection can be changed, and the excavation point is observed by the surveying instrument via the double mirror.