JPH0419505A - Method and instrument for measuring deformation quantity of pipe or the like - Google Patents

Abstract

PURPOSE:To attain safe, high-accuracy, and continuous measurement with time by assembling a reflecting mirror which has a 45 deg. tilt angle to the photodetection surface of a position detector for a laser beam. CONSTITUTION:A movable carriage 3 is arranged in a pipe 1 to be measured, a photodetection position measuring instrument 2 which photodetects the laser beam is arranged on the carriage 3 with its photodetection surface up in a horizontal state, and the reflecting mirror 13 is assembled at the 45 deg. tilt angle to the photodetection surface of the position detector 2 of the laser beam. Fur ther, a horizontal rotary laser oscillator 4 is set axially outside the pipe 1 face the reflecting mirror 13. Then the laser oscillator 4 which is provided axially outside the pipe 1 to be measured oscillates the horizontal rotary laser beam, which can be detected on the photodetection surface of a position detector 2 through the reflection mirror 13 while the carriage 3 is moved in the pipe to measure the deformation quantity of the pipe 1 itself automatically in real time.

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

By the way, when constructing this bi-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, a piano wire 21 is stretched inside a pipe 20 inserted horizontally, and a measurement person crawls into the pipe 20 and uses a measurement scale 22 to measure the piano wire 21 and the inner peripheral surface of the pipe 20. The height H up to this point is measured. That is, the amount of deformation of the pipe is measured by measuring the amount of displacement such as deflection due to the 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 600Il1g1 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) Reading errors are likely to occur because the measurement posture is unreasonable.

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-dependent 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-mentioned object, the present invention is characterized by employing a measurement method using a laser beam having excellent straightness.

In other words, a movable trolley is placed inside the pipe to be measured, and the light receiving position measuring device that receives the laser beam is placed on the trolley so that its light receiving surface faces upward and is in a horizontal state. In addition, 4
A reflector with an inclination angle of 5° was installed.

On the other hand, a laser oscillator for oscillating a horizontally rotating laser was set outside in the axial direction of the pipe corresponding to the reflecting mirror.

Then, while moving the cart, the optical path of the beam oscillated in the horizontal direction from the laser oscillator is changed via a reflecting mirror, and detected by a position detector installed on the cart, thereby detecting the amount of deformation of the pipe. That's what I did.

Further, as a device for carrying out the above measurement method, a laser beam position detector installed on a trolley moving inside the pipe is
The light receiving surface is characterized by being equipped with a level adjustment device so that the light receiving surface is always maintained in a horizontal state with respect to the cart.

(Function) The method and device for measuring the amount of deformation of a pipe, etc. according to the present invention is configured as described above, and therefore a horizontally rotating laser is emitted from a laser oscillator set outside the pipe to be measured in the axial direction. By oscillating it and detecting it with the light-receiving surface of a position detector via a reflecting mirror while moving the cart inside the pipe, it is possible to automatically and in real time measure the amount of deformation of the pipe itself.

In other words, if the pipe itself is bent, the cart moving inside the pipe will descend by that amount.If the cart descends, the beam position detected by the light receiving surface of the position detector installed on the cart will shift. .

By the way, if the beam position detected by the laser beam position detector does not deviate from the center of the light-receiving surface of the position detector that was originally set, that is, the intersection of the X and Y axes, it means that the pipe itself is not deformed. do. The fact that the pipe itself is not deformed means that there is no influence from the excavation work, and it shows that construction can be carried out with peace of mind (Example) Next, based on the drawings showing the example of the present invention, , will be explained more specifically.

In FIG. 1, a cart 3 equipped with a laser beam position detector 2 is installed inside a pipe 1 to be measured, and a horizontally rotating laser beam is mounted on the outside of the corresponding pipe 1 FIG. 2 is a conceptual diagram showing a state in which a laser oscillator 4 that oscillates is set and measurement work is performed.

The laser beam position detector 2 mounted on the trolley 3 has a light receiving window 2a, that is, a light receiving surface, of the position detector 2 mounted on the trolley 3.
A level adjustment device 5 is used to maintain the level at the top.
It is installed on the trolley 3 via. FIG. 2 shows an example of the equipment. As shown in the figure, in the embodiment, the position detector 2 itself is pivotally supported by a pivot 7 via a bracket 6 provided on a truck 3 at a substantially central portion thereof. A control motor 8 consisting of a stepping motor or the like is disposed on one side of the pivotally supported position detector 2, and the control motor 8 is linked to the position detector 2 via a gear transmission mechanism. That is, the position detector 2 itself can be leveled by operating the control motor 8 using a remote control method.

9 and 10.11 are gears and drive shafts that constitute the gear transmission mechanism. Note that 12 is a level indicator integrated into the position detector 2 itself.
13 is a reflecting mirror. As already explained, this is for inverting the beam from the oscillator 4 of the horizontally rotating laser onto the light receiving window 2a of the position detector 2, that is, the light receiving surface.
It is assembled at a 45° angle to the light receiving surface.

FIG. 3 is a perspective view showing a portion where the laser beam position detector 2, a level adjusting device 5 for adjusting the level of the laser beam, and a reflecting mirror 13 are connected.

In the embodiment, the position detector 2 has a horizontally elongated light receiving window 2 as shown in the figure.
In other words, a position detector, commonly called an electronic staff, having a light receiving surface and a light receiving element built into the light receiving surface is configured to be set in a horizontal state via the level adjustment device 5.

That is, by passing through the reflecting mirror 13, the center point O
The structure is such that displacement in the vertical direction can be detected based on .

Note that the means for moving and operating the trolley 3 is not shown in the drawings, but in the embodiment, a wire is connected to one end of the trolley 3, and the wire is operated with a winding device to move it by a so-called traction method. It is configured for operation. Of course, the trolley 3 may be equipped with a drive motor for traveling and may be moved by a motor drive system.

If this method is adopted, the trolley 3 can be moved and operated by remote control, making the measurement work more efficient.

Next, a trolley 3 equipped with the laser beam position detector 2
The horizontally rotating laser oscillator 4 installed outside the pipe 1 in the axial direction uses a commonly used oscillator with a built-in battery, commonly called a laser level. 4a in the diagram is the oscillator 4 itself. This is a level adjustment screw.

Since the present invention is configured as described above based on the embodiments, the horizontally rotating laser oscillator 4 set on the outside in the axial direction of the pipe that is the object to be measured is used to generate the reflected light on the cart placed inside the pipe. By projecting a laser beam onto the mirror and moving the cart, the amount of deflection or deformation of the object to be measured, such as a pipe, can be automatically and immediately measured continuously and over time.

As a result, using the method and apparatus according to the invention,
Compared to conventional measurement methods, the following effects can be expected.

(Effects of the invention) (1) Measurement can be performed without the need for a measuring person to crawl inside the pipe. In particular, it is possible to measure the amount of deformation of pipes with small diameters.

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

(3) It is also possible to measure changes over time.

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

(5) It is also possible to configure so that the detection data of the laser beam position detector can be input into a computer, so that measurement can be performed by so-called computer processing.

As a result of the above-mentioned effects, it is possible to accurately and immediately grasp the deformation of pipes, that is, the deformation of pipes in pipe roof construction methods, etc. can be known in real time, so construction safety management is thorough. Safe construction is possible.

[Brief explanation of the drawing]

The drawings show embodiments of the method and apparatus of the present invention, and FIG. 1 is a conceptual diagram showing the measuring method. FIG. 2 is a side view of a truck equipped with a laser beam position detector, and FIG. 3 is a perspective view thereof. Note that FIG. 4 is a conceptual diagram showing a conventional measurement method. 1... Pipe (object to be measured) 2... Laser beam position detector (light receiving position detector)
2a... Light receiving window 3... Cart 4... Horizontal rotating laser oscillator 5... Level adjustment device 6... Bracket 7... Pivot 8... Control motor 9.10.11... Gear transmission mechanism 12...Level indicator 13...Reflector (light emitter) ■罎

Claims (2)

[Claims] (1) A movable trolley is placed inside the pipe to be measured, and a laser beam position detector is mounted on this trolley.
The device is equipped with the light-receiving surface facing upward and in a horizontal state, and a reflecting mirror is installed at an angle of 45° with respect to the light-receiving surface of the equipped laser beam position detector, and on the other hand, A horizontally rotating laser oscillator is set outside the pipe to be measured in the axial direction, and while the cart is moved, the optical path of the beam oscillated from the laser oscillator in the horizontal direction is changed via the reflecting mirror. A method for measuring the amount of deformation of a pipe, etc., characterized in that the amount of deformation of the pipe is detected by a position detector installed on a cart. (2) It has a cart that moves within the pipe to be measured, a laser beam position detector, a reflecting mirror, and a horizontally rotating laser oscillator, and the laser beam position detector is mounted on a level on the cart. The pipe is equipped with an adjusting device so that the light receiving surface faces upward, and the reflecting mirror is assembled at an inclination angle of 45° with respect to the light receiving surface of the laser beam position detector. Deformation measurement device such as.