JP7052968B1 - Stage staff - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stage staff vertically independent at a predetermined position, which enables height difference survey by level only by a level person in charge. SOLUTION: The stage staff according to the present invention is a stage staff having a swing rod and a support stand for holding the swing rod swingably, and the swing rod has a spherical nut at the upper end and a weight at the lower end. It has a rod body and a target for a level that stands up from the upper end of the swing rod body, and the support stand projects from a support that stands on the base and the upper end of the support and engages with the spherical nut. It is provided with a nut bearing surface and has a support plate for holding the swing rod swingably. [Selection diagram] Fig. 1

Description

The present invention relates to a stage staff used for level-based height difference surveying.

Levels such as automatic level, electronic level or laser level are used for height difference surveying of ground and installation of horizontal floors or surface plates. Such a level is placed at a reference position, and a height difference survey is performed by collimating a stage staff placed at a predetermined position. For this reason, it is important to specify the position of the stage staff installed at a predetermined position and whether it is vertical, and various proposals have been made for performing accurate height difference surveying.

For example, in Patent Document 1, in a surveying target having a reflector installed at a surveying point and reflecting light emitted from a surveying device, a support supporting the reflector and a support integrally provided with the support are provided. A surveying target having a centripetal means for positioning the reflector with respect to the station has been proposed. According to this surveying target, the laser scanner can accurately detect the station even in the surveying by the laser scanner. Further, it is said that the worker can easily perform the centering work of the surveying target accurately and in a short time.

In Patent Document 2, the scale of the stage staff that is swung back and forth is read at a predetermined cycle, and the collimation position on the stage staff is automatically calculated. An electronic level has been proposed with a notification means configured to notify the side worker. According to this electronic level, when measuring the height difference by the waving method, the staff on the stage staff simply swings the stage staff according to the notified swing timing, and the stage staff swings at the optimum timing. It is said that the height difference can be measured accurately without relying on the intuition and skill of the operator on the stage staff.

Further, Patent Document 3 describes a system for measuring the smoothness of a floor, a columnar scale that can be erected on the floor to be measured, a light receiving sensor provided on the outer surface of the scale, and an inclination of the scale. A tilt sensor to detect, and a range sensor that is installed at a reference position away from the floor to be measured and irradiates laser light in the horizontal direction to detect the light that bounces off the light receiving sensor of the stage staff and acquires distance measurement data. , Calculation of the three-dimensional position of the floor on which the stage staff is erected based on the laser light detection position detected by the light receiving sensor, the distance measurement data acquired by the range sensor, and the tilt of the stage staff detected by the tilt sensor. Means and floor smoothness measurement systems are proposed. This floor smoothness measurement system can relatively easily obtain the three-dimensional position of the floor to be measured based on the detection of each sensor even if there is a slight inclination in the way the stage staff is erected. It is said that unevenness can be measured with high density and high accuracy, and the efficiency of measurement work can be improved.

Japanese Unexamined Patent Publication No. 2006-220476 Japanese Unexamined Patent Publication No. 2019-138745 Japanese Unexamined Patent Publication No. 2018-185181

As described in Patent Documents 1 to 3, at least two people, a level staff member and a stage staff staff member, are required for height difference surveying, and a proposal has been made to reduce the burden on the stage staff staff. That is, the surveying target described in Patent Document 1 is provided with a centering means for positioning the reflector, and the person in charge of the stage staff can install the stage staff based on the centering means. For the electronic level described in Patent Document 2, when measuring the height difference by the waving method, it is sufficient for the stage staff to swing the stage staff based on the notification means provided at the electronic level. Not required. The floor smoothness measurement system described in Patent Document 3 detects the inclination of the stage staff with an inclination sensor and corrects the measured value, so that even if there is a slight inclination in the way the stage staff is erected, it can be measured with high accuracy.

The floor smoothness measurement system described in Patent Document 3 has a very small burden on the stage staff with respect to the surveying target described in Patent Document 1 or the electronic level described in Patent Document 2. It is preferable in that it is unnecessary. However, the measurement accuracy and economy of the floor smoothness measurement system depend on the equipment such as the tilt sensor and the calculation means, and the measurement accuracy is not always high. Originally, the height difference survey can be performed more accurately only when the stage staff is erected vertically at a predetermined position.

In view of such conventional problems, it is an object of the present invention to provide a stage staff that is vertically independent at a predetermined position, which enables height difference survey by level only by a level person in charge.

The stage staff according to the present invention is a stage staff having a swing rod and a support stand for holding it swingably, and the swing rod has a swing rod main body having a spherical nut at the upper end and a weight at the lower end. The support stand has a support for a level that stands up from the upper end of the swing rod body, and the support stand has a support that stands up on the base and a nut seat surface that projects from the upper end of the support and engages with the spherical nut. It also has a support plate that swingably holds the swing rod.

In the above invention, the target is preferably a circular tube having a visual marking marker portion at the lower end portion and a scale portion at the upper portion thereof.

Further, the target may be circular and tubular, and may have a visual marking marker portion at the lower end portion and a reflection portion at the upper portion thereof.

The base is a penetration point of the base through which the axis V penetrates when the swing rod is in the vertical state, and the penetration point when the base is in the horizontal state is set as the point P, and the base is in the inclined state. When the penetrating point is the point Q, it is preferable to have a vertical circle centered on the point P and a correction circle composed of a locus of points where the height difference between the point P and the point Q is a predetermined value ΔH. The predetermined value ΔH can be | ΔH | = 1 (mm).

The stage staff according to the present invention can stand vertically at a predetermined position without the need for an adjustment mechanism or operation for vertically standing the stage staff. Therefore, it is possible to perform high-precision surveying in the height difference survey using the level, and it is possible to perform the survey only by the level staff in charge even when there is no stage staff in charge.

It is explanatory drawing of the stage staff which concerns on this invention. A partial cross-sectional view (a, b) showing a state in which the swing rod shown in FIG. 1 is held by a spherical nut portion on a support stand, and a partial cross-sectional view showing a lower end portion of a target standing on the upper end of the swing rod body. (C). It is explanatory drawing of the base part of the support stand shown in FIG.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. 1 to 3 are explanatory views of a stage staff according to the present invention. FIG. 1 is an overall view, FIG. 2 is an explanatory view of an upper end portion where a swing rod is held by a support stand, and FIG. 3 is an explanatory view of a base portion of a support stand. The stage staff 10 has a swing rod 11 and a support stand 20 for holding the swing rod 11 so as to be swingable. The swing rod 11 has a swing rod main body 110 having a spherical nut 112 at the upper end and a weight 111 at the lower end, and a target 15 for a level standing up from the upper end of the swing rod main body 110. The support stand 20 is provided with a support column 22 that stands up on the base 21, and a nut seat surface 236 (FIG. 2B) that projects from the upper end portion of the support column 22 and engages with the spherical nut 112. It has a support plate 23 that holds 11 swingably.

In the main swing rod 11, the swing rod main body 110 and the target 15 are detachable, and the swing rod 11 having a required target can be installed. The swing rod main body 110 is a rod-shaped body having a spherical nut 112 at the upper end and a weight 111 at the lower end. As shown in FIGS. 2A and 2B, the spherical nut 112 is held by a nut bearing surface 236 provided on the support plate 23 of the support stand 20. As a result, the swing rod 11 is held so as to face the direction of the weight 111 (vertical direction V shown in FIG. 3). The nut bearing surface 236 can have a chamfered shape as shown in FIG. 2 (b). As a result, the swing rod 11 is stabilized, and the swing rod 11 is smoothly set in the vertical direction V.

As shown in FIG. 2A, the spherical nut 112 is screw-coupled to a screw portion provided at the upper end portion of the swing rod main body 110, and can be fixed to the swing rod main body 110 by the loosening nut 113. It is preferable that the spherical nut 112 can be adjusted in position by about 50 to 100 mm along the upper end of the swing rod main body 110. The spherical nut 112 preferably has a spherical portion 112a and a flange portion 112b. Further, it is preferable to provide a set nut 114 at the lower part (5 to 15 mm) of the support plate 23 so that the movement range of the swing rod 10 in the height direction is restricted. Since the nut bearing surface 236 has a chamfered shape as described above, the swing rod 11 is easily stabilized and damage to the spherical portion 112a of the spherical nut 112 is prevented. The nut bearing surface 236 does not have to have a spherical shape.

A round bar can be used for the swing rod body 110, and the length thereof can be about 90 to 120 cm. The weight 111 can use a commonly used plumb bob. As shown in FIG. 2 (c), the target 15 is joined to the upper end of the swing rod main body 110 so as to stand upright. The target 15 should be lightweight, and an alum tube can be used as its material. In this case, as shown in FIG. 2C, it is preferable to use a steel long nut 153 for the joint with the swing rod main body 110 in consideration of strength and durability. In this target 15, a long nut 153 is crimped to the target body 151.

The target 15 has a scale for measurement, but it is preferable that the target 15 has a marker so that it can be easily seen. FIG. 1 shows a target 15 having a red marker portion 15a at the lower end portion and a scale portion 15b having a scale for measurement engraved on the upper portion thereof. Since the target 15 is a circular tube and a circular tubular scale portion 15b is provided, it is easy to collimate the target 15. The scale portion 15b scale may be a barcode and is used for automatic level and electronic level. Further, the scale portion 15b can be a reflecting portion that is a reflector of light, and can be used as a stage staff for a laser level.

The support stand 20 only needs to be able to stably hold the swing rod 11. The base 21 is flat and the support stand 20 can be installed vertically. As shown in FIG. 3, when the swing rod 11 is in the vertical state, the vertical circle 215 centered on the point P through which the axis V penetrates. Have. Further, the base 21 is from the locus of a point where the height difference between the point P and the point Q is a predetermined value ΔH when the axis V is a point Q penetrating the base 21 when the base 21 is in an inclined state. Has a correction circle 216. As a result, the height actually measured by the level is measured by the level depending on which point of the correction circle 216 the axis V (tip of the weight) of the swing rod 11 of the installed stage staff indicates, and the height of the point P to actually measure. Can be corrected to. The predetermined value ΔH can be | ΔH | = 1 (mm). Further, the base 21 is provided with a through hole 25 having a shaft V as a central axis, marking is performed through the through hole 25, and the marking position can be confirmed. A removable anchor 26 can be provided for stable installation of the support stand 20.

Using this scale, we installed five 1,500-2,000 mm surface plates side by side in series. The specifications of the stage staff were that the length of the spherical nut of the swing rod was 900 mm, the weight of the weight was 400 g, the length of the marker part of the target was 200 mm, and the length of the scale part was 400 mm. This stage staff was able to stabilize the swing rod 11 in 3 to 5 seconds and indicate the vertical direction in use. The level used was PENTAX AL-M4 manufactured by Asahi Precision Co., Ltd. The installation plane error of the surface plate was 0.1 mm or less.

10 stage staff
11 Swing rod
110 Swing rod body
111 Weight
112 Spherical nut
113 Loosening nut
114 Stop nut
15 Target
151 Target body
153 Coupling nut
20 Support stand
21 base
215 vertical circle
216 Correction circle
22 stanchions
23 Support plate
235 Swing rod hole
236 Nut seat surface
25 through hole
26 Anchor

Claims (5)

A stage staff with a swing rod and a support stand that holds it swingably.
The swing rod has a swing rod main body having a spherical nut at the upper end and a weight at the lower end, and a target for a level standing up from the upper end of the swing rod main body.
The support stand is provided with a base, a support column that stands vertically from the base base, and a nut bearing surface that projects from the upper end of the support column and engages with the spherical nut, and holds the swing rod swingably. Has a support plate and
The base is a stage staff having a vertical circle centered on a point P at which the axis V of the vertical swing rod penetrates the base when the support stand is perpendicular to the installation surface . The scale according to claim 1, wherein the target is a circular tube and has a visual marker portion at a lower end portion and a scale portion or a reflective portion at the upper portion thereof. The base has a penetration point where the axis V of the swing rod penetrates the base when the support stand is tilted with respect to the installation surface as a point Q, and the height difference between the point P and the point Q is a predetermined value ΔH. The scale according to claim 1 or 2, characterized in that it has a correction circle composed of loci of points. A stage staff in which a swing rod having a target for a level is swingably held by a support column that stands vertically from a base, and the axis V of the swing rod in a vertical state when the base is installed in a horizontal state. In the height difference surveying method using a stage staff having a vertical circle centered on the point P penetrating the base.
First, at the time of height difference survey, the point Q where the axis V of the swing rod penetrates the base is obtained, and then the reading of the level measured based on the distance between the points P and Q is corrected, and the height at the point P is corrected. Height difference surveying method to find the difference. A correction circle consisting of the locus of the point Q at which the height difference ΔH is | ΔH | = 1 (mm) with respect to the point P is provided on the base, and the axis V of the swing rod penetrating the base is in the auxiliary circle. The height difference surveying method according to claim 4, wherein the height difference survey is performed as described above.

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