JPH0385517U

JPH0385517U -

Info

Publication number: JPH0385517U
Application number: JP14587889U
Authority: JP
Priority date: 1989-12-20
Filing date: 1989-12-20
Publication date: 1991-08-29

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例を示す斜視図、第２
図は第１図の−線断面図である。図中、１……トンネル方位測定用スタツフ、２
……スタツフ本体、３……スケールスタツフ、５
……反射ターゲツト、６……水平器、８ａ……テ
ーパ着座面である。 Fig. 1 is a perspective view showing one embodiment of the present invention;
The figure is a sectional view taken along the line -- in FIG. In the figure, 1... Tunnel orientation measurement staff, 2
...Statusf body, 3...Scale stats, 5
. . . reflective target, 6 . . . level, 8a . . . tapered seating surface.

Claims

[Scope of utility model registration request]

A tapered seating surface is formed at least at the bottom of both ends of the stud, which extends horizontally and along the chordal direction on the inner surface of the cylindrical segment that substantially defines the tunnel wall, for engaging and seating the inner surface. , in a tunnel measurement staff provided with reflectors sensitive to the measurement light of the laser transit at both ends and at the center of the measurement side surface of the staff, the above-mentioned staff is provided with the reflectors at the same position on the tip side, and the reflectors are A pair of scale studs each having a length scale formed in the longitudinal direction from the center thereof, and a stud body for engaging these scale studs so as to be freely protrusive and retractable toward both ends in the chordal direction, A staff for measuring tunnel direction, characterized in that the reflector is provided at a position, and a level is provided on either the scale staff or the staff main body.