JPH055447Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a device for measuring the difference between the planned center line and the installation center line of a small diameter pipeline buried underground.

<Prior art> In general, the method for measuring the difference from the planned center line of a pipeline buried underground is to set an optical instrument installed in a shaft or manhole at the planned center line, The method used is to set a surveying instrument at a predetermined position in the pipe and measure the difference from the center line, but for small-diameter pipes of φ600 or less, it becomes difficult for people to enter and exit the pipe to set the surveying instrument at a predetermined position in the pipe. It was impossible to measure inside the road. Furthermore, in recent years, a device has been adopted in which a device in which a circular target is attached to a trolley is pulled by a rope or the like, and the target numerical value is read with an optical instrument.

<Problems to be solved by the invention> In the conventional target pulling device, when the buried pipeline is on the design center line, even if the truck rolls, the laser beam etc. from the optical instrument will always be on the center point of the target. However, if there is a deviation from the planned center line, the rolling of the trolley will make it difficult to read the target value, and the trolley will be pulled back, the rolling will be corrected, and the tow will be re-done, and the measurement will be carried out again. The current situation is that it takes a long time. Furthermore, if the pipeline has a slope, the target device will tilt back and forth,
Accurate measurement values cannot be obtained due to errors caused by target tilt.

Furthermore, the target numerical value is read visually by a person using an optical instrument, and the measured values submitted can be fabricated and have low credibility.

<Means and methods for solving the problem> In order to solve the problems with the prior art target devices, the present invention provides highly accurate measurements by eliminating the effects of target rolling and back-and-forth tilting. .

As a method for this purpose, a weight is installed at the lower end of the target as a mechanism to rotatably support the circular target at its center, so that even if the trolley rolls, the weight always rotates it back to its original position. In addition, as a method of eliminating the influence of front and rear inclinations, the diameter of the target support hole is made slightly larger than the support shaft that supports the target, thereby making it possible for the target to have a front and rear inclination. As shown in FIG. 3, by making the end surface of the target hole sharp so that the support shaft 6 and the target 12 come into line contact, the target 12 can move freely.
It is always maintained vertically by the action of the lower end weight.

Furthermore, by reading the measured values of the target at a predetermined position in the measurement pipe using a CCD camera, the target and the spot on the target produced by the laser beam generator are displayed on the monitor of the control panel installed in the shaft or on the ground. By using a system that automatically records video from the control panel, we have made it possible to provide highly reliable measurement values without human intervention.

<Example> An example according to the present invention is shown in Figs. 1, 2, and 3.
It is shown in FIG. 4 and FIG. 4, and will be specifically explained.

A circular target 12 is supported by a central support shaft 6 of a transparent support plate 2 at the front of a protection frame 5 forming an equilateral hexagon, and is equipped with a weight 3 at the lower end.
Set up. The shape of the support plate 2 is similar to that of the protective frame 5.
is fixed to the frame 5. The support hole 15 at the center of the target 12 is located at the center of the target 12 as
The opening is slightly larger than the support shaft 6 supporting the target 12, and the cross-sectional shape is such that it makes line contact with the support shaft 6 at the center of the target 12 in the thickness direction. The permissible tilt angle θ at which the target 12 can be rotated and tilted back and forth is determined by the following equation.

θ=cos ^-1 D ₂ /D ₁ where D ₁ : Target support shaft diameter D ₂ : Target center support hole diameter The allowable inclination angle θ is the planned slope of the laid pipe, taking into account the installation error. D ₁ and D ₂ are determined. In this case, the target 12, the support hole diameter
There is a concern that the difference between D ₁ and support shaft diameter D ₂ will be added to the vertical (level) error, but the installation slope of pipes is usually less than 1°;
The difference between (D ₁ −D ₂ ) is also sufficient to be 1 to 2 and can be ignored. Due to the above mechanism and the action of the weight 3, the target 12 is not affected by rolling or tilting back and forth. At the rear of the protective frame 5, there is a fixing plate 10 with CCD cameras 8 installed at two locations.
It is attached so as to be located on the center line of the measurement pipe 14. The rear end of the inspection camera 8 is connected to a hard special cable 16 and is connected to a shaft or manhole 1.
9 is connected to the control panel 17. Control panel 17
has a built-in monitor, and the monitor screen has the function of displaying the date, time, and distance traveled by the inspection camera 8. Further, below the protective frame 5, a trolley 13 is equipped with legs whose length can be adjusted according to the pipe diameter so that the centers of the target 12 and the inspection camera 8 always align with the center line of the measurement pipe 14. are connected. The attachment position of the legs is adjusted by attaching or detaching legs having a predetermined thickness depending on the pipe diameter to the upper part of the running wheels of the truck 13 or the like. The method of measuring the difference between the planned center line and the construction center line of the measuring pipe 14 using the device 1 will be explained below. A hard special cable 16 inserted from a manhole or shaft 19 is connected to the rear end of the inspection camera 8. Next, a laser beam generating device 20 is installed in the manhole or vertical shaft 18 on the side of the device 1 so that the beam falls on the planned center line of the measurement pipe 14, and is emitted to the target 12 of the device 1. On the other hand, an inspection camera 8 is installed on the monitor of the manhole 19 or the control panel 17 installed on the ground.
The target 12 and the spot created by the light beam from the laser beam generator 20 are projected, and the monitor image is recorded by a video deck. As described above, by gradually pulling the special cable 16, the device 1 is sequentially moved to a predetermined position to measure the difference between the planned center line and the construction center line of the measurement pipeline 14. In this example, the measured values are stored using a video recording method, but if necessary, the video signals can be processed, displayed, plotted, and recorded using ordinary electronic circuit technology. is also possible.

<Effects of the invention> With this invention, it is possible to measure the installation status of small diameter pipes of φ600 or less, and the measured values can also be measured by rolling,
It has good accuracy and is not affected by longitudinal inclination. Furthermore, the measurement method is simply pulling a special cable, which does not require advanced technology and enables short-time measurements.

Furthermore, the measured values showing the difference between the planned center line and the construction center line were recorded by a video deck connected to the control panel, making them highly reliable.

[Brief explanation of the drawing]

FIG. 1 is an explanatory longitudinal cross-sectional view showing a surveying device according to the present invention. FIG. 2 is a sectional view taken along arrow A-A in FIG. Third
The figure is a detailed sectional view of the target support part. FIG. 4 shows an explanatory longitudinal cross-sectional view showing the measurement method. FIG. 5 shows an overall end view of the target and target support when assembled. In addition, 4 in the figure is a guide pin. 7 indicates a target guide. These are for maintaining the distance between the fixed plates 2. 9 is the fixed plate mounting wall.
11 is a patch plate. 21 indicates a fixed ring.

Claims (1)

[Scope of utility model registration request] In a device for measuring the difference from the planned center line of a small-diameter pipeline laid underground, a transparent support plate 2 is provided at the front and rear of a protective frame 5 formed of an equilateral polygon or a circle. A transparent or translucent target 12 is rotatably and tiltably supported by a central support shaft 6 of the target 12, and is equipped with a weight 3 at its lower end. The target 12 and the CCD camera 8 are connected by a fixed plate 10 provided at two locations to match the target.
A small-diameter pipe surveying device comprising: a trolley (13) equipped with legs whose length can be adjusted so that the center of the measuring pipe (14) is always on the center line of the measurement pipe (14).