JPH0653903U - A length measuring device suitable for measuring the length of underground pipes - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a length measuring device capable of accurately measuring the length of an underground buried pipeline or the like with a simple structure. [Structure] A wire 2 unwound from a take-up reel 3 to which relatively weak moderate braking is applied is wound around a length-measuring pulley 6 with a rotation counter about once, and then fed out via a guide 7 while being unwound through a guide 7 or the like. It is characterized in that the length of the inserted wire 2 is measured based on the number of rotations of the length measuring pulley 6.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a length measuring device suitable for measuring the length of a pipeline buried in the ground.

[0002]

[Prior art]

 When a new underground line is installed or replaced in a pipeline that passes through an underground line such as a power line or a telephone line, the length of the pipeline must be checked in order to confirm in advance the required length of the underground line to be inserted. As the manhole is usually installed every 300 m, the pipe line is not only 300 m long and is not always straight, but it may be curved or bent. In some cases, some parts of the pipeline are blocked due to breakage or collapse, so it is not possible to measure the length optically. Needs to be measured. In addition to measuring with a measure, there is a method of measuring the payout length of the cable, etc. by the amount of rotation of the pulley that rotates with the payout of the wire and cable, and measuring the tunnel or water depth by the length of the payout cable. It is known from JP-A-56-70402 and JP-A-57-136101.

[0003]

[Problems to be solved by the device]

 According to the conventional technology that measures the amount of rotation of the pulley that rotates as the cable is extended, when measuring the extension length of the cable, press a relatively thick cable with a circular cross section and poor flexibility against the pulley. Since the pulleys are rotated by friction between the two while traveling under the above condition, the contact area between the two is extremely limited, and the slip phenomenon easily occurs, so that the payout length of the cable cannot be accurately measured. There are serious drawbacks.

Therefore, an object of the present invention is to provide a length measuring device capable of accurately measuring the length of an underground buried pipeline or the like with a simple structure.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention winds a wire, which is unwound from a winding reel provided with a braking means having a relatively weak braking action, around a measuring pulley with a rotation counter about once, and then feeds it out through a guide. However, it is characterized in that it is inserted into a measurement target such as an underground buried pipeline, and the length of the inserted wire is measured based on the number of rotations of the length measuring pulley.

[0006]

[Action]

 The payout length of the wire is calculated by "(diameter of measuring pulley + diameter of wire) x π x number of rotating counts", so the value of "(diameter of measuring pulley + diameter of wire) x π" is For example, when the length measuring pulley and the wire are selected to be 1 m, the display of the rotation counter itself is the length of the wire fed out in m units, and therefore the specified portion such as the end of the wire is displayed. In the state where it coincides with the starting end of the buried pipe, after resetting the display on the rotary counter to zero, while unwinding the wire, insert it into the buried pipe and tighten the wire over the entire length of the designated part. The length of the buried pipeline can be known by reading the display of the rotation counter under the condition that it matches the end of the pipeline.

[0007]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments. The underground buried pipe as the object to be measured by the device of the present invention is, for example, as shown in FIG. 1, a shaft-like pipe provided at the relay portion of the pipes P, P through which underground lines such as power lines and telephone lines are inserted. The manholes H and H provided are adopted, but the present invention is not limited to the pipes between manholes of the underground relay line, and the present invention is applied to other facilities such as water and sewer pipes and gas pipes. be able to.

In the length measuring apparatus of the present invention, as shown in FIGS. 1 and 2, for example, a reel 3 for winding the length measuring wire 2 is rotatably provided near the rear end of the base 1, and the reel 3 is rotatable. 3 is provided with a handle 4 so that the wire 2 can be wound around the reel 3 by the handle 4, and a relatively weak brake means 5 is attached to the reel 3 so that the reel 3 can play freely. To prevent it from turning, always apply a moderate amount of braking, and separately install a length-measuring pulley 6 near the front end of the base 1 so that the wire 2 pulled out from the reel 3 is at least about once. A guide 7 for restricting the position of the wire 2 that is fed out from the length-measuring pulley 6 is provided in front of the length-measuring pulley 6 as well as when it is fed forward in the wound state. As shown A short cylindrical shape may be used, but it is preferable to adopt a structure in which the wire 2 is constantly elastically pressed, so that the wire 2 wrapped around the length measuring pulley 6 can be kept in a tension state at all times. It is desirable to provide a guide 7 similar to the above also in the middle of the reel 3 and the length measuring pulley 6.

As a device for counting the rotation of the length measuring pulley 6, a digital type rotary counter 8 is based on a state in which a receiving portion 9 such as a retractable passive arm is close to the peripheral edge of the length measuring pulley 6. In addition to being installed on the stand 1, a driving portion 10 such as a protrusion is attached to the periphery of the length measuring pulley 6 so as to correspond to the receiving portion 9 of the rotation counter 8, whereby, for example, "(diameter of length measuring pulley + If the diameter of the length measuring pulley 6 and the diameter of the wire 2 are selected so that the diameter of the wire x π "is, for example, 1 m, the length measuring pulley 6 rotates once every time the wire 2 is fed 1 m. Since the rotation counter 8 counts 1 each time, the payout length of the wire 2 is displayed on the rotation counter 8 in units of m.

The rotation counter 8 may be a mechanical counter using a gear, or may be an electric counter that electrically counts the input of the receiving portion 9 such as a microswitch and the closed path of the microswitch, or a pulse input. In the case of the electric counter according to 1., a reed switch may be used as the receiving unit 9 and a magnet may be used as the driving unit 10. In addition, an optical sensor may be adopted as the receiving unit 9 and an optical sensor may be used as the driving unit 10. A light-shielding plate that changes the light reception with respect to may be adopted.

As the wire 2, a piano wire may be used, but a thin wire rope having a diameter of 2 mm or less is desirable because it is highly flexible. If it is too thick, it is inconvenient to handle and the weight increases, and the flexibility is high. Is less likely to cause a measurement error, and if it is too thin, the wires 2 are easily entangled with each other, which is extremely disadvantageous in handling. According to the results of the implementation, the diameter of the wire 2 is about 0.5 to 1.0 mm. It is optimal, and if 1 m is measured by one rotation of the length measuring pulley 6, the diameter of the length measuring pulley 6 needs to be about 317 mm, and the device becomes large. The measuring pulley 6 with a diameter of about 159 mm is adopted, and the driving parts 10 attached to the measuring pulley 6 are provided at five places at equal intervals, whereby 10 cm is measured every 1 count and every 10 counts. To 1 m may be measured, and the diameter of the length measuring pulley 6 can be arbitrarily set by interposing a speed change mechanism such as a gear mechanism or a Malta cross mechanism between the length measuring pulley 6 and the rotation counter 8. It can be designed, and when an electric counter is adopted, it is possible to process by counting one for every arbitrary number of pulse inputs by incorporating a microcomputer. Also in this case, the diameter of the length measuring pulley 6 can be designed arbitrarily.

As the braking means 5, for example, as shown in the figure, a rubber tire 11 is fitted on a reel 3, and the reel 3 is supported by a pair of bearing rollers 12, 12 on the base 1 at the rubber tire 11 portion. The support rollers 12 and 12 are pressed against the rubber tire 11 portion by the weight of the reel 3 so that the rubber tire 11 can be locally rotated while being always depressed, so that the resistance caused by the deformation of the rubber tire 11 can be prevented. A relatively weak braking action on the reel 3 is applied.

It is necessary to rewind the unwound wire 2 to the reel 3 after the measurement is completed. However, if the wire 2 is still wound around the length measuring pulley 6 at the time of rewinding, the rotary counter 8 operates unnecessarily. Therefore, the length measuring pulley 6 may be detachably attached and the length measuring pulley 6 may be removed when the wire 2 is unwound, or only when the length measuring pulley 6 is pivotally supported in a cantilevered state and unwound. The wire 2 may be removed from the measuring pulley 6 as shown by the chain line in FIG.

In using the above-described length measuring device, as shown in FIG. 2, the tip of the wire 2 is kept in the vicinity of the tip of the wire 2 while the tip of the wire 2 is tied to the tow line R previously inserted into the buried pipeline P in the ground. The wire 2 is drawn out so that the marked position is marked at the start end of the buried pipeline P to be measured, and the display of the rotation counter 8 is reset to zero at that time and then pulled. It suffices to read out the rotation counter 8 at the position where the mark portion coincides with the end of the buried pipeline P by pulling out the wire 2 sequentially by the pulling by the rope 10, and after the measurement is completed, move the length measuring pulley 6 to the handle 4. The wire 2 is unwound by the turning operation so as to be rewound and ready for the next measurement.

Regarding the measurement of the distance to the closed portion of the buried pipeline that is closed on the way, a push rod that can be replenished in sequence was prepared and the tip of the wire 2 was bonded to the tip of this push rod. As it is, the push rods can be successively added and inserted into the buried pipeline, or the wire 2 can be introduced by being pulled by a self-propelled small vehicle.

[0015]

[Effect of device]

 As described above, the present invention has the following effects. a Since the thin length measuring wire 2 is wound around the length measuring pulley 6 at least once, the wire 2 is tightly wound around the length measuring pulley 6 and at the same time, The contact portion between the pulley 6 and the wire 2 is increased to prevent slippage, and the measurement error is remarkably reduced to enable accurate measurement. b The wire 2 is wound around the reel 3 to which appropriate braking is always applied, and the guide 7 for regulating the position of the wire 2 fed from the length measuring pulley 6 is provided, so that the wire 2 is always stable on the length measuring pulley 6. It is useful for accurate measurement because it can be kept in a wound state. c Relatively weak braking means 5 is attached to the reel 3 so that an appropriate amount of braking is always applied. Therefore, even when the wire 2 is rapidly pulled out for measurement, the reel 3 is allowed to freely idle due to inertia. Therefore, it is possible to prevent the wire 2 from being unnecessarily released and entangled in the adjacent portion, or the wire 2 entangled with each other.

[Brief description of drawings]

FIG. 1 is a side view of a length measuring device.

FIG. 2 is a vertical sectional side view showing a usage state of the length measuring device.

[Explanation of symbols]

 1 Base 2 Wire 3 Reel 4 Handle 5 Brake Means 6 Side Long Pulley 7 Guide 8 Rotation Counter 9 Receiver 10 Drive

Claims (1)

[Scope of utility model registration request] 1. A reel (3) provided with a braking means (5) having a relatively weak braking action is wound around a base (1) so that a wire (2) can be wound by operating a handle (4). It is movably installed and the base (1)
A length measuring pulley (6) is provided near the front end of the so that the wire (2) drawn from the reel (3) is wound around the length measuring pulley (6) at least once. In addition, a guide (7) for regulating the position of the wire (2) is provided at the end of the feeding, and a rotation counter (8) is provided on the base (1) and its receiving portion (9) is a measuring pulley (6).
And a drive unit (10) attached to the length measuring pulley (6) so as to correspond to the receiving unit (9) of the rotation counter (8). A length measuring device suitable for measuring the length of a road.