JPH0419504A - Method and instrument for measuring deformation quantity of pipe or the like - Google Patents

Abstract

PURPOSE:To measure the quantity of deformation of a pipe, etc., safely and highly accurately even continuously with time by oscillating a laser beam while moving a carriage and detecting the displacement of the beam by a photodetection position measuring instrument. CONSTITUTION:On the carriage 3 which is arranged movably in the pipe 1 to be measured, a laser oscillator 2 which oscillates the laser beam 12 is mounted and the photodetection position measuring instrument 4 which photodetects the beam 12 from the laser oscillator 2 is arranged opposite axially outside the pipe 1. While the carriage 3 is moved, the beam 12 is oscillated and the photodetection position measuring instrument 4 detects the displacement of the laser beam 12 to measure the quantity of deformation of the pipe 1. Namely, if the pipe 1 itself deflects, the carriage 3 which moves in the pipe moves down correspondingly. When the carriage 3 moves down, the laser oscillator 2 mounted on the carriage shifts in its oscillation position. The photodetection position measuring instrument 4 detects the shift in the oscillation position automatically and instantaneously. Consequently, the safe, high-accuracy, and continuous measurement with time is made possible.

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention is applicable to cases where the crown is shallow and there is a railway, road, or other ground structure on top of it, or where it is close to underground structures such as buried objects. The present invention relates to a method and device for measuring the amount of deformation of pipes in the bi-roof construction method, which is used to protect structures when excavation work is carried out.

(Prior Art) For example, when there is a structure on the ground, if excavation work is performed around the structure, the ground loosens due to the excavation work and affects the structure.

Therefore, in order to prevent this effect, a so-called pipe roof construction method is known in which multiple steel pipes are inserted horizontally and the upper load is supported by the row of inserted pipes to prevent the ground from loosening due to excavation. be.

By the way, when constructing this pipe roof construction method, measuring and managing the amount of deformation of the horizontally inserted pipe is an extremely important management item for construction safety.

Conventionally, this measurement management has been carried out by a method as illustrated in FIG. That is, the piano wire 21 is stretched inside the pipe 20 inserted horizontally. A measuring person then crawls into the pipe 20 and uses a measuring scale 22 to measure the height H between the piano wire 21 and the inner peripheral surface of the pipe 20. That is, the amount of deformation of the pipe is measured by measuring displacement such as deflection due to load.

(Problems to be Solved by the Invention) However, the diameters of pipes used in pipe roof construction methods and the like do not always allow a measuring person to crawl into the pipe and carry out measurement work, as illustrated above. By the way, the diameter of the pipe that can be measured is limited to about 600mm at most.

For these reasons, conventional measurement methods have the following major problems.

(1) There is a limit to the measurable vibrodiameter.

(2) Measurement work is difficult because the measurement location is narrow.

(3) Continuous measurement is not possible.

(4) The measurement posture is unreasonable and reading errors are likely to occur.

The above-mentioned problems are inconvenient in maintaining safe construction management, and it is necessary to develop a measurement method and measurement device that can easily perform continuous and time-varying measurements with higher accuracy. It had been requested.

In order to meet these demands, the present invention aims to provide a new measuring method and device as described below.

(Means for Solving the Problems) As a means for achieving the above object, the present invention is characterized by employing a measurement method using a laser beam with excellent straightness.

In other words, a movable trolley is installed inside the pipe 7 that is the object to be measured, and a laser oscillator that oscillates a laser beam is installed on this trolley, and on the other hand, the axial direction of the corresponding pipe of the trolley equipped with this laser oscillator is A light-receiving position measuring device for receiving the beam from the laser oscillator is installed on the outside of the vehicle, and the laser is oscillated without moving the cart, and the displacement of the laser beam is detected by the light-receiving position measuring device. The reason is that the amount of deformation of the pipe is measured.

In addition, the laser oscillator installed on the cart that moves inside the pipe as a device for carrying out the above measurement method is equipped with a vertical holding mechanism to maintain the verticality of the laser oscillator itself and a vibration isolator to prevent shaking. The reason is that it is configured to be equipped through the.

Furthermore, the light-receiving position measuring device for detecting the beam from the laser oscillator is constructed with a stuff-type light-receiving position measuring device that instantly detects vertical displacement of the laser beam.

(Function) The method and apparatus for measuring the amount of deformation of a pipe, etc. according to the present invention are configured as described above, so that the cart is moved while oscillating a laser beam from a laser oscillator at appropriate times, and the beam is projected onto a light receiving position measuring device. By detecting the position of the beam, it is possible to automatically and immediately measure the displacement of the pipe itself. In other words, if the pipe itself is bent, the cart moving inside the pipe will be moved by that amount. If the truck descends, the oscillation position of the laser oscillator installed on the combined truck will shift accordingly. If the oscillation position shifts, the shift is automatically and immediately detected by the light receiving position measuring device.

Incidentally, if the beam position detected by the light receiving position measuring device does not deviate from the initially set light receiving position of the light receiving position measuring device, that is, the intersection position of the X and Y axes, it means that there is no deformation in the pipe itself. The fact that the pipe itself has not been deformed means that it has not been affected by the excavation work, indicating that the safety of the work is ensured.

(Example) Next, an example of the present invention will be described in more detail based on the drawings.

First, in FIG. 1, a trolley 3 equipped with a laser oscillator 2 is placed inside a pipe 1 to be measured via a vertical holding mechanism and a vibration isolator, and a trolley 3 equipped with a laser oscillator 2 is placed inside a pipe 1 to be measured. A state in which a light receiving position measuring device 4 is arranged on the outside to receive a laser beam and perform measurement work is shown.

FIG. 2 is a side view showing a schematic structure of the laser oscillator 2 installed on the truck 3 inside the pipe 1.

In the embodiment, an oscillator commonly called a laser level that includes a built-in semiconductor laser element is used. FIG. 3 is a front view of a light receiving position measuring device 4 that receives a laser beam from the laser oscillator 2 and detects the light receiving position of the laser beam. In other words, it shows a light receiver with a laser beam position detection function.

In the embodiment, a staff-type light-receiving position measuring device, commonly called an electronic staff, having a built-in light-receiving element is used.

Next, the structure of a so-called vertical holding mechanism and a vibration isolating device for mounting the laser oscillator 2 vertically on the truck 3 without shaking will be explained with reference to FIG.

First, as a vertical holding mechanism, a ladder-shaped frame 5 as shown in the figure is provided on the trolley 3, and the laser oscillator 2 itself is suspended from the frame 5 with a hanging wire 6. Note that 7 and 7 are adjustment screws for adjusting the installation level of the suspended laser oscillator 2.

As a vibration isolating device for preventing the vibration of the laser oscillator 2 due to movement of the cart 3, as shown in FIG. will be established. A floating block 11 of a float type attached to the lower surface of the pedestal 10 of the laser oscillator 2 is suspended in the damper liquid reservoir 9. In other words, the system is designed to prevent shaking using a vibration isolating device with one type of damper.

In the embodiment, nothing is shown about the means for moving the trolley 3 itself, but it may be possible to connect a wire to the trolley 2 and move the wire in a traction manner via a winding device, or The trolley 3 is equipped with a drive motor for traveling, and is configured to be driven by remote control to perform movement operations.

Also, the laser beam 1 oscillated by the laser oscillator 2
The light-receiving position measuring device 4 that receives the light beam 2 uses a staff-type light receiver having a built-in light-receiving element, as described above. That is, as shown in FIG. 3, the rectangular main body has a light receiving window 4a on the front side, and inside the light receiving window 4a,
A device constructed with a built-in so-called light-receiving element is used.

In the embodiment, a light receiving position measuring device 4 that can detect only the vertical direction (y-y) is used. Of course in the X direction and in the Y direction
A light receiving position measuring device that can detect the direction may be used.

(Effects of the Invention) Since the method and device for measuring the amount of deformation of a pipe, etc. according to the present invention are configured as explained above, they can bring about the following effects compared to conventional measuring methods and means. can.

(1) It is possible to measure the amount of deformation of a pipe with a small diameter without the need for a measuring person to crawl inside the pipe.

(2) Continuous measurement can be performed over the entire length of the pipe.

(3) Changes over time can be measured.

(4) Since the measurement uses a laser beam with excellent straightness, the measurement accuracy is high and there is no variation.

(5) By connecting the detection data from the light receiving position measuring device, that is, the laser beam receiver, to the computer so that the data can be input into the computer. It is possible to perform measurement processing with higher accuracy and more quickly.

As a result of the above-mentioned effects, it is possible to accurately and immediately grasp the deformation of pipes, in other words, it is possible to easily know the deformation of pipes in the bi-roof construction method, etc., so construction safety management is thorough. Safe construction is possible.

[Brief explanation of the drawing]

The drawings show examples of the method and apparatus of the present invention, and FIG. 1 is a conceptual diagram showing the measuring method. FIG. 2 shows a cart equipped with a laser oscillator constituting the measuring device, and FIG. 3 is a front view of a light-receiving position measuring device (electronic staff) that similarly receives a laser beam from the laser oscillator. Note that FIG. 4 is a conceptual diagram illustrating a conventional measurement method. 1... Pipe (object to be measured) 2... Laser oscillator (laser level) 3... Trolley 4... Light receiving position measuring device (electronic staff) 5... Frame 6... Hanging Wire 7... Level adjustment screw 8... Damper liquid 9... Damper liquid reservoir 10... Support stand 11... Floating block

Claims (2)

[Claims] (1) A movable cart equipped with a laser oscillator is installed inside the pipe to be measured, and the other cart equipped with the laser oscillator is placed outside of the corresponding pipe in the axial direction from the laser oscillator. A light-receiving position measuring device for receiving the beam is provided oppositely, the laser beam is oscillated while the cart is moved, the displacement of the beam is detected by the light-receiving position measuring device, and the amount of deformation of the pipe is measured. A method for measuring the amount of deformation of pipes, etc. (2) It has a cart that moves within the pipe, a laser oscillator, and a light receiving position measuring device that receives the laser beam from the laser oscillator, and the laser oscillator is arranged to maintain verticality on the cart. It is equipped via a holding mechanism and a vibration isolator for preventing shaking, and the light receiving position measuring device is a staff type light receiving position measuring device that detects vertical displacement of the laser beam. A device for measuring the amount of deformation of pipes, etc.