JPH03173309A - Cable laying apparatus - Google Patents

Abstract

PURPOSE:To lay a cable safely, reliably and efficiently by detecting tension and side pressure of a cable to be laid in an underground duct and then transmitting the detection results to the outside of the duct and receiving the transmitted signals. CONSTITUTION:When a power cable 5 is inserted into an underground duct 3 while being pulled by means of a wire rope 12, it is subjected to tension and side pressure. The tension and the side pressure are detected directly by means of a tension/side pressure gage 11 mounted on the power cable 5, and detection results are transmitted through a transmission unit 11 and the wire rope 12 to a ground receiving unit 17. By such arrangement, tension and side pressure of the power cable 5 can be monitored easily with high accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cable laying device for laying, for example, a chemical cable in an underground conduit.

[Prior Art] Conventionally, as a means of laying underground cable cables, manholes are provided at both ends of the place where the cable is to be laid, a conduit is buried between the two manholes, and the cable is wound around a cable drum above ground. A wire of the required length is connected to the tip of the Takaka cable, and the tip of the wire is sent from one manhole through the pipe to the other manhole, and the wire sent to the manhole is guided to the ground via a metal wheel.
A method is known in which the underground pipe is towed by a winch on the ground, and thereby the cable is inserted into the underground pipe.

During this installation, in order to prevent excessive force from being applied to the cable cable, a tensioner is connected to the metal wheel and the tension applied to the cable cable is monitored.

However, the tension measured via the metal wheel is the resultant force of the tension applied to the wire and the tension of the wire, and it was not possible to directly measure only the tension applied to the wire.

In addition, pipelines are often buried directly under roads, and as a result, pipelines have not only bends and slopes, but also steps at joints. A phenomenon called lateral pressure occurs.

Although the condition of these conduits can be confirmed to some extent through numerical calculations based on construction drawings and inspection work such as test-passing the cable through a bobbin before cable installation, the details of the condition and the risk of damage to the cable can be confirmed to some extent. At present, detection of sudden abnormal phenomena relies on the intuition of experts.

[Problems to be Solved by the Invention] In the conventional installation method, it is not possible to directly measure the tension applied to the cable cable, and the lateral pressure generated at bends in the pipe is also applied. Unreasonable force is often applied to the cable cables, making it difficult to install them safely, reliably, and efficiently.

This invention was made in view of the above circumstances, and its purpose is to enable easy and accurate monitoring of the tension and lateral pressure applied to the cable, thereby enabling safe, reliable and efficient cable installation. An object of the present invention is to provide a cable installation device that can perform the following operations and greatly improve the quality of installation work.

[Means for Solving the Problem] The present invention provides a cable installation device for inserting and installing a cable into an underground conduit by pulling it with a wire, which is provided on the cable and detects the tension and lateral pressure applied to the cable. A transmitting means transmitting a detection result of the detecting means to the outside of the conduit, and a receiving means receiving a transmission signal of the transmitting means.

[Function] When a cable is inserted into an underground conduit while being pulled by a wire, tension and lateral pressure are applied to the cable. At this time,
The tension and lateral pressure applied to the cable are detected by the detection means, and the detection results are transmitted to the outside of the conduit by the transmission means. This transmission signal is then received by the receiving means.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

In Figure 1, 12 are manholes at both ends of the place where you want to install the chemical cable (a distance of several hundred meters).
It is set in. A conduit 3 is buried from the bottom of the manhole 1 to the bottom of the manhole 2.

Further, a cable drum 4 is installed near the opening of the manhole 1 on the ground. This cable drum 4
A chemical caple 5 is wound around the manhole, and the chemical caple 5 is fed into the manhole 1 one after another by an electric caterpillar 6.

Inside the manhole 1, there are provided a plurality of pipe rollers 7 for guiding the chemical capule 5 to the pipe line 3.

A transmitting unit 10 is connected to the tip of the first generation cable pulley 5 via a pulling eye 8 and a twister 9, and a tension sensor, which is a detection means, is connected to the transmitting unit 10 at the tip of the transmitting unit 10.
A pressure regulator 11 is attached. A wire lobe 12 for traction is connected to the tip of the tension/pressure gauge 11, and the tip of the wire lobe 12 is fed into the pipe line 3 and enters the inside of the manhole 2.

The transmitting unit 10 has an outer diameter equal to the inner diameter of the pipe line 3 (130 mm) so that it can be inserted into the pipe line 3 together with the tension/pressure regulator 11.
-150 mm), and has sufficient strength to withstand vibrations etc. that occur during installation.

The wire lobes 12 are so-called wire lobes with built-in three-core wires for signal transmission, and have sufficient strength to withstand repeated use. Although not shown, the wire of the wire lobe 12 is electrically connected to the transmitting unit 10 by a signal line passing through the cover of the tension/pressure regulator 11, and together with the signal line and the transmitting unit 10, the tension - It constitutes a transmitting means for transmitting the detection signal of the pressure regulator 11 to a receiving unit 17, which will be described later.

A metal wheel 13 is provided inside the manhole 2, and the metal wheel 13 guides the wire lobes 12 coming out of the pipe 3 toward the opening side of the manhole 2.

Meanwhile, on the ground, a guide roller 14 is placed near the opening of the manhole 2. Electric winch 15. Wire winding drum 1
6. and a receiving unit 17 are installed.

The guide roller 14 guides the wire lobe 12 to the electric winch 15.

The electric winch 15 pulls in the wire lobe 12 and winds it around the wire winding drum 16 .

The receiving unit 17 is electrically connected to the wire of the wire lobe 12 via a slip ring (not shown) attached to the wire winding drum 16, and receives a signal sent via the mW, that is, a tension/lateral pressure needle. 11 detection signals are received.

Here, a specific configuration of the tension/lateral pressure needle 11 (1) is shown in FIG.

That is, the tension/lateral pressure needle 11 is provided with a tension strain gauge 22 and a lateral pressure strain gauge 23 on a round bar (small diameter portion that captures strain) 21, and the tension (tensile strain) F+ applied to the power cable 5 is measured by the tension strain gauge 22. The same lateral pressure (bending strain) F2 applied to the power cable 5 is detected by the lateral pressure strain gauge 23.

In addition, to deal with the fact that the round bar 21 rotates due to the action of the twister 9, and to deal with the fact that it is not possible to specify which position on the circumferential surface of the round bar 21 the lateral pressure (bending strain) F2 is applied, a lateral pressure strain gauge is used. 23 is actually 23a, 23b, 23c, 23
There are four pieces d, which are arranged at equal intervals in the circumferential direction of the round bar 21.

On the other hand, the configuration of the main part of the electric circuit including the tension/lateral pressure needle 11 is shown in FIG.

First, each strain gauge of the tension/lateral pressure needle 11 consists of a bridge circuit of four elements, and these strain gauges are connected to transmitters 31, 32a, 32b, and transmitters of the transmitter unit 10.
32c and 32d are connected.

and transmitters 31.32a, 32b, 32c.

32d is connected to the receiving unit 17 via the wire 12a of the wire lobe 12.

The transmitters 31.32a, 32b, 32c, and 32d use the power supply section 33 as their operating power source, and are activated by receiving a calling signal of a specific frequency from the receiving unit 17, and emit an electric signal corresponding to the state of the strain gauge. It is something. Note that the frequency of the calling signal differs depending on the transmitter.

The receiving unit 17 includes a calling device 41 and a CPU (central processing unit) 42.

The paging device 41 transmits paging signals to each of the two transmitters of the transmitting unit 10 in a predetermined order, and receives signals emitted from each transmitter in response to the transmission.

The CPU 42 includes a functional means for detecting the tension applied to the power cable 5 based on the signal of the tension strain gauge 22 among the signals taken into the calling device 41, and a lateral pressure strain gauge 23a among the signals taken into the calling device 41, 23b, 23c
, 23d, a functional means for detecting the lateral pressure applied to the power cable 5 based on the signals of the power cables 5, a functional means for determining whether the detected tension and lateral pressure match predetermined allowable conditions, and a functional means for determining whether the detected tension and lateral pressure match predetermined allowable conditions. It also includes functional means for controlling the operation of the electric winch 15 accordingly.

Next, the operation in the above configuration will be explained.

The tip of the wire lobe 12 is inserted into the conduit 3 from the manhole 1 and guided to the opening of the manhole 2 via the metal wheel 13. Then, the tip of the wire lobe 12 is connected to the guide roller 14.
and a wire winding drum 16 via an electric winch 15.
Connect to. At this time, the electric wire 12a of the wire lobe 12
is electrically connected to the receiving unit 17 via a slip ring (not shown) attached to the wire winding drum 16.

When the electric winch 15 is activated in this state, the wire lobe 12 is pulled in the direction of the arrow shown in FIG. 1 and wound around the wire winding drum 16.

The electric cable 5 wound around the cable drum 4 is sequentially fed into the manhole 1 by the pulling by the wire lobe 12 and the feeding of the electric caterpillar 6.

The fed power cable 5 is further pulled and inserted into the conduit 3 while being guided by the vibrating roller 7.

During this insertion, the tension applied to the electric cable 5 is
It is detected by the pressure regulator 11. Further, side pressures applied due to bends or steps in the pipe line 3 are similarly detected by the tension/pressure regulator 11.

The detection results of the tension/pressure regulator 11 are transmitted to the receiving unit 17 by the transmitting unit 10 and the wire 12a of the wire lobe 12.

The receiving unit 17 detects the tension and lateral pressure applied to the electric cable 5 from the received signal, and if the detection result matches predetermined allowable conditions, continues the operation of the electric winch 15 and the electric caterpillar 6. .

However, if the detection result does not meet predetermined allowable conditions, the receiving unit 17 determines that there is an abnormality and stops the operation of the electric winch 15 and the electric caterpillar 6. Due to this stoppage, damage to the power cable 5,
It is possible to prevent problems such as deformation and deterioration of electrical performance.

In this case, the worker may be notified of the abnormality by sounding a buzzer or lighting a lamp.

In this way, the tension/pressure regulator 11 provided on the power cable 5
Since the tension and lateral pressure applied to the power cable 5 of the same type are directly detected and the detection results are transmitted to the receiving unit 17 on the ground by the transmitting unit 11 and the wire lobe 12, the tension and lateral pressure applied to the power cable 5 can be easily detected. Moreover, it can be monitored with high precision.

Therefore, it is possible to carry out safe, reliable and efficient laying, and it is possible to significantly improve the quality of the laying work.

Moreover, in the CP, U 42 of the receiving unit 17,
By accumulating various data obtained during installation, not only can each installed cable be managed individually, but it can also be expected to have a great effect on preliminary consideration and data analysis when installing cables on the same route at a later date. .

In the above embodiment, the case where an electric power cable is laid has been described, but the present invention is not limited thereto, and can be applied to various cables such as the laying of a communication cable.

In addition, the present invention is not limited to the above-mentioned embodiments, and various modifications can be made without changing the gist.

[Effects of the Invention] As described above, according to the present invention, in a cable installation device that inserts and installs a cable into an underground conduit by pulling it with a wire, the tension and tension provided on the cable and applied to the cable are Since it is equipped with a detection means for detecting lateral pressure, a transmission means for transmitting the detection result of this detection means to the outside of the pipeline, and a reception means for receiving the transmission signal of this transmission means, the tension and lateral pressure applied to the cable can be reduced. It is possible to provide a cable installation device that can easily and accurately monitor cables, thereby performing safe, reliable and efficient cable installation, and making it possible to significantly improve the quality of cable installation work.

[Brief explanation of the drawing]

Fig. 1 is an overall configuration diagram of an embodiment of the present invention, Fig. 2 is a perspective view showing a specific configuration of tension/lateral pressure: 1゛ in the embodiment, and Fig. 3 is an essential diagram of the embodiment. It is a block diagram of the electric circuit of the part. 1.2...manhole, 3...pipeline, 5...7i
Capable, 10... Transmission unit (transmission means), 1
1 tension/pressure regulator (detection means), 12... wire robe, 12a... wire (transmission means), 15... electric winch, 17... receiving unit.

Claims (1)

[Claims] In a cable installation device that inserts and installs a cable into an underground conduit by pulling it with a wire, a detection means is provided on the cable and detects the tension and lateral pressure applied to the cable, and the detection results of this detection means are described above. 1. A cable installation device comprising a transmitting means for transmitting data to the outside of a conduit, and a receiving means for receiving a transmitted signal from the transmitting means.