JP2019002685A - Height measurement device and height measurement method - Google Patents

Abstract

To measure the height from the ground for the measuring object existing obliquely above the measuring person.SOLUTION: The height measuring instrument 1 includes a laser rangefinder 2, a support portion 3, and a hanging portion 4. The laser rangefinder 2 emits a laser beam, receives the reflected light, and measures the distance to the reflecting surface. The support portion 3 is an elongated member. The hanging portion 4 is a member for suspending the laser rangefinder 2 at the tip end portion 31 of the supporting portion 3. The hanging portion 4 hangs the laser rangefinder 2 so as to be able to swing in all horizontal directions. In the laser rangefinder 2, the emission direction of the laser L is vertically downward by the hanging portion 4.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a height measuring device for measuring the height of a measurement object from the ground, and a height measuring method using the height measuring device.

  In the inspection of bridges over the road, girder and under girder guards are measured. The empty head of a girder is the height from the road surface (ground) to the lower surface of the girder. The head of the under-girder protection is the height from the road surface to the lower surface of the under-girder protection. Conventionally, there is a measuring method using a measuring rod or a laser rangefinder (laser rangefinder) for the sky head measurement. In the measuring method using the measuring rod, the measurer extends the measuring rod from the road surface directly above to the girder or under-girder protective work and measures the empty head. The laser distance meter is a device that emits a laser, receives reflected light, and measures the distance to the reflecting surface (see, for example, Patent Document 1). In the measurement method using the laser distance meter, the measurer places the laser distance meter on the road surface and emits a laser to the upper girder or under-girder guard to measure the sky head.

  However, in any of the measurement methods, since the measurer performs the measurement work on the road directly below the girder or the like, there is a concern about the risk of a traffic accident. Moreover, in such a measuring method, a measurement error is likely to occur due to the inclination of the measuring rod and the laser emission direction, and work time is required to increase the measurement accuracy.

  If the measurer can perform the measurement work in a place where a vehicle such as a sidewalk or under the girder does not pass, there is no risk of a traffic accident. However, in such a place, the girder, etc., which is the object to be measured is positioned obliquely above the measurer, and therefore the height of the girder etc. cannot be measured by the conventional method using a measuring rod or a laser distance meter. .

JP 10-246782 A

  The present invention solves the above-described problem, and an object of the present invention is to accurately measure the height from the ground of a measurement object that is obliquely above the measurer.

  The height measuring instrument of the present invention is for measuring the height of the measurement object from the ground, and measures the distance to the reflecting surface by emitting the laser and receiving the reflected light. A suspension unit that suspends the laser distance meter from the tip of the support unit, the suspension unit being capable of swinging in all horizontal directions. The laser rangefinder is characterized in that the laser emission direction is vertically downward by the suspension part.

  In the height measuring instrument of the present invention, it is preferable that the suspension part has a ball joint, and the laser distance meter is suspended from the tip of the support part via the ball joint.

  The height measuring method according to the present invention is a height measuring method using the height measuring device, wherein the support portion is supported with its tip portion directed obliquely upward.

  In this height measurement method, the measurement object may be a bridge girder or a girder guard, and the ground may be a road surface.

  According to the height measuring instrument of the present invention, the laser distance meter is suspended at the tip of the support portion so as to be swingable in all horizontal directions, and the laser emission direction is vertically downward, so that the support portion is supported obliquely. This makes it possible to accurately measure the distance from the measurement object obliquely above the measurer to the ground, that is, the height of the measurement object from the ground.

The side view of the height measuring device which concerns on one Embodiment of this invention. The side view which shows the use condition of the same height measuring device.

  A height measuring device according to an embodiment of the present invention will be described with reference to FIG. This height measuring instrument is a measuring instrument for measuring the height from the ground. As shown in FIG. 1, the height measuring instrument 1 includes a laser distance meter 2, a support part 3, and a hanging part 4. The laser distance meter 2 measures the distance to the reflecting surface by emitting a laser and receiving the reflected light. The support part 3 is a long member. The suspension part 4 is a member that suspends the laser distance meter 2 from the tip part 31 of the support part 3. The suspending unit 4 suspends the laser rangefinder 2 so as to be swingable in all horizontal directions. In the laser distance meter 2, the emission direction of the laser L is vertically downward by the hanging portion 4.

  The hanging part 4 has a ball joint 41. The laser rangefinder 2 is suspended from the tip 31 of the support 3 via a ball joint 41.

  Each configuration of the height measuring instrument 1 configured as described above will be described in further detail. The measured value measured by the laser distance meter 2 is displayed on the surface of the laser distance meter 2, and the measured value can be found by reading the display. The laser distance meter 2 may be a wireless device having a short-range wireless communication (IEEE 802.15.1) function for digital devices, and wirelessly transmit the measurement value to a portable terminal such as a smartphone carried by the user.

  The support part 3 has a rod 32 and a bent part 33. In the present embodiment, the bar 32 is a straight round bar. In use, the rod 32 is supported obliquely by the user with the proximal end side. The bent portion 33 has a bent shape and is provided on the distal end side of the bar 32. For this reason, the front-end | tip part 31 of the support part 3 exists in the position deviated from the extension line X of the elongate direction of the stick | rod 32. As shown in FIG. This deviation prevents the suspended laser rangefinder 2 from interfering with the support 3. In addition, in order to prevent an electric shock when the height measuring instrument 1 is accidentally touched with the electric wire, the support portion 3 may be insulated. For example, the rod 32 is made of FRP (fiber reinforced plastic) which is an insulator. In addition, you may comprise the support part 3 so that expansion-contraction is possible. Further, the support portion 3 may be extended by connecting a plurality of rods 32 in series.

  The hanging part 4 has a ball joint 41, one of the ball joints 41 is attached to the tip part 31 of the support part 3, and the other has a holder 42. The holder 42 is a metal frame and holds the laser distance meter 2. The ball joint 41 is also called a ball joint, and is a joint (joint) that includes a sphere (ball) and a socket that makes spherical contact with the sphere, and is rotatable in any direction. The laser distance meter 2 is suspended by a ball joint 41 so as to be swingable in all horizontal directions, and the emission direction of the laser L is vertically lowered by the gravity acting on the laser distance meter 2.

  An example of a height measuring method using the height measuring device 1 configured as described above will be described with reference to FIG. The measurement object is, for example, a bridge girder 5. The measurement object may be a girder guard. The height to be measured is the height of the girder 5 from the road surface 6 which is the ground. The girder 5 is supported by a substructure such as an abutment 51. A user 7 of the height measuring instrument 1 as a measurer stands on a sidewalk 61 adjacent to the road surface 6. The user 7 supports the support unit 3 with the front end 31 of the support unit 3 facing obliquely upward. Then, the distal end portion 31 is brought close to the beam 5. The laser distance meter 2 emits the laser L vertically downward and measures the distance d1 to the road surface 6. The distance d2 between the portion of the laser distance meter 2 that emits and receives the laser and the tip portion 31 of the support portion 3 is constant. The sum (d1 + d2) of the distance d1 and the distance d2 is the height of the girder 5 from the road surface 6, that is, the head under the girder. Note that the height measuring device 1 is particularly suitable for measurement of the under-sparing head, and is therefore sometimes referred to as a under-sparing rangefinder.

  As described above, according to the height measuring instrument 1 according to the present embodiment, the laser distance meter 2 is suspended from the distal end portion 31 of the support portion 3 so as to be swingable in all horizontal directions, and the emission direction of the laser L is vertically downward. Therefore, by supporting the support part 3 diagonally, the distance from the measurement object that is obliquely above the measurer to the ground, that is, the height of the measurement object from the ground can be accurately measured.

  Since the laser distance meter 2 is suspended from the distal end portion 31 of the support portion 3 via the ball joint 41, the laser distance meter 2 can swing in all horizontal directions.

  In addition, this invention is not restricted to the structure of said embodiment, A various deformation | transformation is possible in the range which does not change the summary of invention. For example, instead of the ball joint 41, the hanging part 4 is configured so that the laser rangefinder 2 can be swung in all horizontal directions by connecting two orthogonal pendulum mechanisms that can swing in the horizontal direction in series. May be. Moreover, you may use the height measuring device 1 for height measurement other than the empty head measurement of a girder and under-girder protection work.

DESCRIPTION OF SYMBOLS 1 Height measuring device 2 Laser distance meter 3 Support part 31 Tip part of support part 4 Hanging part 41 Ball joint

Claims (4)

A height measuring instrument for measuring the height of a measurement object from the ground,
A laser rangefinder that emits a laser, receives the reflected light, and measures the distance to the reflecting surface;
A long support,
A suspension part for suspending the laser distance meter at the tip of the support part,
The hanging part suspends the laser distance meter so as to be swingable in all horizontal directions,
The laser distance meter is a height measuring device characterized in that a laser emission direction is vertically downward by the hanging portion. The hanging part has a ball joint,
The height measuring instrument according to claim 1, wherein the laser distance meter is suspended from a tip portion of the support portion via the ball joint. A height measuring method using the height measuring instrument according to claim 1 or 2,
The height measurement method, wherein the support portion is supported with its tip portion directed obliquely upward. The measurement object is a bridge girder or under girder protective work,
The height measurement method according to claim 3, wherein the ground is a road surface.

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