JPH10178720A - Power cable inserting equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to clean the inside of an underground buried pipe and perform cable inserting work with atmospheric pressure utilized by adopting a vacuum method to an exclusive equipment for inserting a power cable. SOLUTION: By the operation of a vacuum equipment 1, a space between a pig 26 and vacuum nozzle 3 becomes vacuum and, at the same time, the insertion side of the pig 26 is pushed by the atmospheric pressure, the pig 26 is sucked by the differential pressure and rapidly travels through the underground buried pipe 15, and power cable is pulled through a guide rope 42. In this way, if the pig 26 advances in proportion to the tension applied to the guide rope 42, a pressure release valve is opened, operation of stopping the pig 26 is repeated, and the guide rope 42 and power capable are gradually pulled through the inside of the underground buried pipe. At the same time, a rubber board moves while contacting the inner wall of the pipe and the inside of the pipe is cleaned.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a power cable passing device.

[0002]

BACKGROUND ART Underground pipes for power cable transmission are
It is connected between manholes with a span of 100 to 300 m, and this underground pipe has
Four kinds of pipes made of vinyl chloride and having a diameter of 125 to 200 mm are used. The above-mentioned underground pipes are not only buried horizontally, but also buried at an angle or are buried so that they sink in some sections, so that rainwater partially accumulates in the pipes In many cases, drainage work and pipe cleaning work were performed, and then guide rope entry and power cable entry were performed. These operations are performed using general-purpose machines, for example, compressors, submersible pumps, manhole cleaners, and the like, and work efficiency is not good. In addition, by inserting the balloon from one end of the underground pipe and sending the balloon under pressure by an air compressor, cleaning and entering work may cause dirt on the balloon arrival side or may prevent workers on the balloon arrival side from working. There was a danger that the balloon that suddenly popped out due to the pressure of the compressor would hit it, and the compressor noise was also large. Especially, in the case of a large diameter underground pipe, a large compressor was used, so the engine noise was loud. In addition, the tension applied to the guide rope at the time of incoming wire could not be adjusted, and the guide rope was disconnected without the tension of the guide rope, causing many troubles.

[0003]

DISCLOSURE OF THE INVENTION The present invention is a dedicated device for power cable passage, and uses a vacuum method to clean underground buried pipes and perform wire entry work by utilizing a pressure difference from the atmospheric pressure. It is an object of the present invention to provide a power cable wiring device which can solve the above-mentioned conventional problems.

[0004]

According to the present invention, a vacuum nozzle and a vacuum blower are connected to an inlet side of a cyclone catcher for separating water and air, and a pump motor is driven to an outlet side of the cyclone catcher. A drain nozzle connected to the drain pump, and a check valve to shut off the drain passage during operation of the drain pump in the passage from the cyclone catcher to the vacuum blower. A suction filter is installed between the passage and the vacuum blower, a discharge silencer is installed from the vacuum nozzle to the drainage pump, and the above equipment is covered with a soundproof enclosure. A vacuum pressure gauge is provided in a part of the soundproof enclosure. And
And a vacuum device having a control panel for controlling the operation of the vacuum blower and the pump motor, and a diameter of an outlet from which a power cable is drawn out of an underground pipe connected between manholes and manholes. An end plate is provided for the insertion tube having the largest diameter among the insertion tubes whose diameters are sequentially increased in accordance with the attachment, and an attachment having a hose connection port communicating with the insertion tube is provided on the end plate, and a hose connection port for the attachment. And a vacuum hose connected between the vacuum nozzle of the above-mentioned vacuum device and a conical pressure release valve fixed to one end of the central shaft, and a cylinder which is in contact with the pressure relief valve is slidable on the central shaft. A spring is inserted between the washer fixed to the other end of the center shaft and the above-mentioned spring receiving piece. Each of the flanges provided on the outer periphery of both ends of the cylinder has a pig having an annular rubber plate having a diameter in contact with the inner wall of the underground pipe replaceably fixed by a holding plate, and the center shaft. The above-mentioned problem is solved by comprising a pressure release valve side end and a guide rope connected between the end of the power cable.

[0005]

DETAILED DESCRIPTION OF THE INVENTION A vacuum nozzle is connected to an inlet on the side of the upper end of a cyclone catcher for separating water and air, and a vacuum blower, preferably a motor, is connected to an inlet on the upper end of the cyclone catcher. A drain pump driven by a pump motor, preferably a positive displacement drain pump, is connected to the outlet at the lower end of the cyclone catcher, and a drain nozzle is connected to this drain pump. A check valve is installed in the passage from the cyclone catcher to the vacuum blower to shut off the passage during operation of the drainage pump, and a suction filter is installed between the passage and the vacuum blower. And a drain silencer to install a discharge silencer, and install the above equipment in a soundproof enclosure. A vacuum device is constructed by installing a vacuum pressure gauge on a part of the soundproof enclosure and installing a control panel for controlling the operation of each of the above motors. For example, a generator is electrically connected as a power source, but a commercial power source may be used instead of the generator.

[0006] Among the underground pipes connected between manholes and manholes, there are outlets for drawing out power cables,
Attach the attachment. This attachment is
An end plate is provided for the insertion tube having the largest diameter among the insertion tubes whose diameters are sequentially increased according to the difference in diameter of the outlet, and a hose connection port communicating with the insertion tube is provided at the center of the end plate. It becomes. A vacuum hose is connected between the hose connection port and the vacuum nozzle of the vacuum device.

A pig is inserted into the underground pipe. This pig uses, for example, a stud bolt on its central axis, and fixes a conical pressure release valve by screwing it near one end, and slides the stud bolt inside the cylinder that abuts the pressure release valve. A spring receiving piece that fits freely is fixed, and a coil spring is interposed between the washer received by the nut screwed from the other end of the stud bolt and the above-mentioned spring receiving piece, and the above-mentioned cylinder is used as a pressure release valve. Always press, that is, keep the valve closed. On each flange provided on the outer periphery of both ends of the cylinder, an annular rubber plate having a diameter that contacts the inner wall of the underground pipe is used. It is constituted by fixing exchangeably. In addition,
The elasticity of the coil spring can be finely adjusted by adjusting the screwing amount of the nut. A guide rope is connected between the end of the stat bolt on the pressure relief valve side of the pig and the end of the power cable wound in the manually wound winch and going through the underground pipe.

In the power cable passing device having the above-described configuration, the vacuum device and the generator are installed near the manhole from which the power cable is drawn, and a drainage hose connected to a drainage nozzle is connected to a drainage nozzle. . In addition, in the underground pipe, one of the insertion tubes of the attachment fitting to the diameter of the outlet is inserted into the outlet opening into the manhole, and the attachment is liquid-tightly fixed to the outlet. A vacuum hose is connected between the vacuum nozzle and the hose connection port of the attachment. Then, the motor that drives the vacuum blower is operated by operating the control panel, and the check valve is operated so that it opens the passage from the cyclone catcher to the vacuum blower, and the air and water in the underground pipe are removed. The air is sucked and introduced into the cyclone catcher to separate water and air, and the air is exhausted by passing through the above passage and the suction filter by operation of the vacuum blower, and the water is stored in the cyclone catcher.
Next, the check valve is operated so as to shut off the passage, and then the drainage pump is operated by operating the control panel, and the water collected in the cyclone catcher is drained through the drainage nozzle and the drainage hose into the gutter. To drain. In addition,
The drain pump is operated continuously and simultaneously during operation of the vacuum blower. When a positive displacement drain pump is used as the drain pump, it also has a valve function to maintain airtightness, and it is possible to secure the vacuum pressure even when it stops.

Next, two annular rubber plates having a diameter matching the diameter of the underground pipe to be passed through the power cable are selected, and they are fixed to the respective flanges of the pig by the annular holding plate. One end of the guide rope is connected to the end of the pig stat bolt on the pressure relief valve side with a wire fitting, and the other end of the guide rope is connected to the tip of the power cable wound in the manual winding winch with a fitting. connect. This pig is inserted into the underground pipe that opens into the manhole into which the power cable is drawn. Immediately thereafter, the check valve is operated to open the passage.

Then, the space between the pig and the vacuum nozzle is evacuated by the operation of the vacuum blower, and at the same time, the pig insertion side is pressed at the atmospheric pressure. ， Pull the power cable through the guide rope. When the tension applied to the guide rope reaches a certain value, the coil spring is compressed against its elasticity, and the pressure relief valve separates from the cylinder and opens, leaving a gap between the pressure relief valve and the cylinder. Since air can pass through the above gap and flow into the suction side of the pig from the insertion side of the pig, the vacuum pressure between the pig and the vacuum nozzle approaches the atmospheric pressure, and the thrust of the pig decreases. The pig advances and stops by an amount proportional to the tension applied to the guide rope. When a positive displacement vacuum blower is used as the vacuum blower, the blower has the advantage of being able to easily maintain the pig speed at a constant speed due to the constant air volume characteristic, and to easily obtain the vacuum pressure and to use less power. is there.

When the pig stops, the pressure release valve returns to its original position by receiving the elastic force of the coil spring and closes, and the guide rope and the power cable are slackened due to the extra force pulled by them. Then, the operation between the pig and the vacuum nozzle is evacuated by the operation of the vacuum blower, and the pig is sucked by the pressure difference from the atmospheric pressure, so that the pig advances rapidly in the pipe. As described above, when the pig advances in proportion to the tension applied to the guide rope, the operation of opening the pressure release valve and stopping the pig is repeated.
Guide ropes and power cables are gradually pulled through the underground pipes. At the same time, the rubber plate moves while contacting the inner wall of the tube to clean the inside of the tube. When the pig reaches the attachment, the vacuum pressure rises because the pressure relief valve does not open even if the guide rope is loosened, so that the arrival of the pig can be visually confirmed by the vacuum pressure gauge of the control panel. Next, the operation of the vacuum motor is stopped by operating the control panel, and at the same time, the operation of the vacuum blower is stopped. Then, remove the attachment from the outlet of the underground pipe, pull out the pig from the outlet into the manhole, remove the guide rope from the pig, wind it with a winch, or pull it manually, Route the cable through the underground pipe.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIGS. 1 to 3, reference numeral 1 denotes a vacuum device, which is provided with a φ100 mm φ400 mm × 770 mm cyclone catcher 2 at the entrance at the upper end side surface. A vacuum nozzle 3 having a cam lock 3a and a cam lock adapter 3b provided at the tip end as shown in FIG. 4 is connected, and a 18.5 kW-4P positive displacement nozzle is provided at the entrance of the upper end face of the cyclone catcher 2. A 1500 rpm vacuum blower 5 driven by a vacuum motor 4 is connected, and a 2.2 kW-6P pump motor 6 is connected to a lower end outlet of the cyclone catcher 2.
The pump is connected to a drain pump 7 having a diameter of 50 mm, which is provided with a cam lock 8a and a cam lock adapter 8b at the tip as shown in FIG. A check valve 10 is installed in the passage 9 connected to the vacuum blower 5 from the cyclone catcher 2 to shut off the passage 9 when the drainage pump 7 is operated, and a suction valve is provided between the passage 9 and the vacuum blower 5. A filter 11 is installed, and a discharge silencer 12 is installed from the vacuum nozzle 3 to the drainage pump 7.
A part of the soundproof enclosure 13 is provided with a vacuum pressure gauge 14a and a control panel 14 for controlling the operation of the motors 4 and 6. Is, as its power source,
For example, the generator 1a is electrically connected. The specifications of the vacuum apparatus 1 are designed as follows. Power supply: AC200V 3φ 60Hz Power: 20.7kW Air volume: 12m ³ / min × -4500mmAq Drainage capacity: 150 liter / min × 3Kgf / cm ² Noise: Approx. 78dB (A) Weight: Approx. 980Kg

The underground pipe 15 is connected between manholes 16 having a span of 100 to 300 m and manholes 17 as shown in FIG. 6, and four types of φ125 to 200 mm depending on the location of the line construction. One of the PVC pipes is used. As shown in FIG. 7, normally, a nominal diameter D is 125 mm, 150 mm, 1 mm in an outlet 19 from which the power cable 18 is drawn out of the underground pipe 15.
One of four types of end bells 20 of 75 mm and 200 mm is fixed.
Attachment 21 shown in FIG. The attachment 21 has insertion tubes 22a to 22d whose diameters are sequentially increased in accordance with the inner diameters of the four types of end bells 20, and a circular end plate 23 is provided for the insertion tube 22d having the largest diameter. Is provided with a hose connection port 24 which communicates with the insertion tubes 22a to 22d. This hose connection port 2
4 and the vacuum nozzle 3 of the vacuum device 1
The vacuum hose 25 is connected.

Reference numeral 26 denotes a pig to be inserted into the underground pipe 15. As shown in FIGS. 9 and 10, a conical pressure release valve 28 is fixed to one end of an M5 stud bolt 27 by screwing. Cylinder 29 in contact with pressure relief valve 28
A spring receiving piece 30 slidably fitted to the stat bolt 27 is fixed in the inside of the nut, and a washer 31 received by a nut 31a screwed from the other end of the stat bolt 27 and the spring receiving piece 30 are provided. , With the coil spring 32 interposed, the cylinder 29 is constantly pressed against the pressure release valve 28,
That is, four kinds of annular rubber plates 35 having diameters that come into contact with the inner walls of the above-mentioned four kinds of underground pipes 15 are provided on the flanges 33 and 34 provided on the outer periphery of both ends of the cylinder 29 with the valve closed. , 36 are pressed against each other, and on the outside thereof, annular holding plates 37, 38 are pressed, and screw bolts 3 are attached to the flanges 33, 34 from the holding plates 37, 38.
9 and 40 are screwed in at appropriate intervals, and rubber plates 35 and 3
6 is exchangeably fixed to the flanges 33 and 34. The elasticity of the coil spring 32 can be finely adjusted by adjusting the screwing amount of the nut 31a.

As shown in FIG. 9, one end of a guide rope 42 is connected to the end of the stat bolt 27 of the pig 26 on the side of the pressure release valve 28, and the other end of the guide rope 42 is connected to the other end of the guide rope 42. The distal end of the power cable 18 wound in the manually wound winch is connected by the joint fitting 43.

In the power cable passing device having the above configuration, the vacuum device 1 and the generator 1 a are installed near the manhole 17 from which the power cable 18 is drawn, and the drain nozzle 8 has Connect the hose 46. If rainwater 47 is collected at the bottom of the manhole 16 into which the power cable 18 is drawn, another vacuum device 48 is installed near the manhole 16 and the vacuum device 48 sucks the rainwater 47. The vacuum hose 49 to be drained is connected to a drain hose 51 for draining the sucked rain water 47 to the side groove 50, and the vacuum device 48 is operated to drain the rain water 47 to the side groove 50. When the drainage is completed, a manual winch 52 in which the power cable 18 is wound is inserted into the manhole 16. If rainwater does not accumulate in the manhole 16, the manually wound winch 52 is directly put into the manhole 16. In addition, even when rainwater accumulates at the bottom of the manhole 17, the vacuum device 4 is located near the manhole 17.
8 is installed, and the vacuum hose 49 sucks rainwater,
The water is drained to the gutter 45 by the drain hose 51.

After that, the insertion tube 2 of the attachment 21 fitting to the nominal diameter D of the end bell 20 fixed to the opening in the manhole 17 of the underground pipe 15.
2a to 22d, for example, by inserting the insertion tube 22d into the end bell 20 and pressing the end plate 23 against the end face of the end bell 20 on the outlet side, the attachment 21
Is fixed to the end bell 20 in a liquid-tight manner.
And a vacuum hose 25 is connected between the hose connection port 24 of the attachment 21. The control panel 14 controls the vacuum blower 5 to continue to operate, controls the check valve 10 to open the passage 9, and sucks air and water in the underground pipe 15. , Is introduced into the cyclone catcher 2 to separate water and air, and the air is exhausted by passing the passage 9 and the suction filter 11 by the operation of the vacuum blower 5, and the water is stored in the cyclone catcher 2. Next, after operating the check valve 10 so as to shut off the passage 9, the drainage pump 7 is controlled to operate by operating the control panel 14, and the drainage nozzle 8 and the drainage hose 46 are inserted into the cyclone catcher 2. The accumulated water is drained to the gutter 45.

Next, the rubber plate 3 having a diameter matching the diameter of the underground pipe 15 through which the power cable 18 is to be passed.
5 and 36, and press them on the flanges 33 and 34 of the pig 26 by the holding plates 37 and 38.
0, one end of the guide rope 42 is connected to the end of the stat bolt 27 on the side of the pressure release valve 28 by a wire joint fitting 41, and the other end of the guide rope 42 is connected to a manually wound winch 52. The distal end of the power cable 18 wound around is connected by the joint fitting 43. The pig 26 is inserted into the underground pipe 15 opening into the manhole 16. Immediately thereafter, the check valve 10 is operated so as to open the passage 9.

Then, the space between the pig 26 and the vacuum nozzle 3 is evacuated by the operation of the vacuum blower 5, and at the same time, the insertion side of the pig 26 is pressed at atmospheric pressure. And the power cable 18 is pulled via the guide rope 42. Then, when the tension applied to the guide rope 42 reaches a certain value, the coil spring 32 is compressed against its elasticity, the pressure release valve 28 is separated from the cylinder 29 and opens, and the pressure release valve 28 and the cylinder are opened. Since a gap is formed between the pigs 29, air passes through the gap from the insertion side of the pig 26, flows into the suction side of the pig 26, and the vacuum pressure between the pig 26 and the vacuum nozzle 3 approaches the atmospheric pressure. Therefore, the thrust of the pig 26 becomes small, and the pig 26 advances and stops by an amount proportional to the tension applied to the guide rope 42.

Then, the cylinder 29 becomes the coil spring 3
Under the resilience of 2, the valve returns to the original position, closes the valve, and the guide rope 42 and the power cable 18 are slackened due to the extra force being pulled. Then, the space between the pig 26 and the vacuum nozzle 3 is evacuated by the operation of the vacuum blower 5, and the pig 26 is sucked by the pressure difference from the atmospheric pressure, so that the inside of the pipe 15 advances rapidly. As described above, the pig 26 is proportional to the tension applied to the guide rope 42.
Progresses, the operation of opening the pressure release valve 28 and stopping the pig 26 is repeated, so that the guide rope 42 and the power cable 18 are gradually pulled in the pipe 15. At the same time, the rubber plates 35 and 36 move while contacting the inner wall of the tube 15 to clean the inside of the tube 15. And
When the pig 26 reaches the attachment 21, the pressure increase is confirmed by the vacuum pressure gauge 14a, and the operation of the vacuum motor 4 is stopped by operating the control panel 14, and at the same time,
The operation of the vacuum blower 5 is stopped. Then, the attachment 21 is detached from the end bell 20, the pig 26 is pulled out from the end bell 20 into the manhole 17, the guide rope 42 is detached from the pig 26, and it is wound by a winch or pulled by a hand. 18 is passed through the pipe 15. The pig 26 drawn into the manhole 17 is cleaned and reused.

The present invention is not limited to the above embodiment, but may be appropriately designed and modified within the scope of the claims.

[0022]

The present invention is configured as described above, and has the following effects. Since it is configured as a dedicated device for power cable passage, drainage work, pipe cleaning work, guide rope insertion work, and power cable insertion work can be performed efficiently. Since the vacuum system is adopted, it is inherently safe. The operation of the vacuum blower makes it possible to simultaneously drain, clean, and insert the power cable into the underground pipe. The pig has a relief function with a pressure relief valve, which can prevent breakage of the guide rope and allow the pig to advance by an amount proportional to the tension applied to the guide rope, enabling safe work and working on one side of the manhole. Labor can be saved because only the user needs. An attachment that fits the pipe size of the underground pipe has been made compatible with incoming power cables.
The power cable can be inserted into any of the four types of underground pipes with different diameters using a single wiring device. By adopting the vacuum system, the equipment can be made more compact and functionally configured. The noise is lower than that of the conventional compressor system, and equipment that emits noise is covered with a silencer or soundproof enclosure. Therefore, since the noise is further reduced, it is possible to perform power cable entry work in a quiet residential area without hindrance.

[Brief description of the drawings]

FIG. 1 is a front view of a vacuum device.

FIG. 2 is a plan view of the vacuum device.

FIG. 3 is a side view of the vacuum device.

FIG. 4 is a side view in which a part of the vacuum nozzle is cut away.

FIG. 5 is a side view in which a part of a drain nozzle is cut away.

FIG. 6 is an explanatory view showing a state in which a power cable is being inserted.

FIG. 7 is a side view in which a part of an end bell is sectioned;

FIG. 8 is a side view of the attachment.

FIG. 9 is a side view showing a state where a power cable is connected to the pig via a guide rope.

FIG. 10 is a side view showing a part of a pig as a cross section.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vacuum apparatus 1a Generator 2 Cyclone catcher 3 Vacuum nozzle 4 Vacuum motor 5 Vacuum blower 6 Pump motor 7 Drain pump 8 Drain nozzle 9 Passage 10 Check valve 11 Suction filter 12 Discharge silencer 13 Soundproof enclosure 14 Control panel 14a Vacuum pressure gauge Underground pipes 16, 17 Manholes 18 Power cables 21 Attachments 22a to 22d Inserting cylinders 23 End plates 24 Hose connection ports 25 Vacuum hoses 26 Pigs 27 Stat bolts 28 Pressure relief valves 29 Cylindrical 30 Spring receiving pieces 31 Washers 32 Coil springs 33, 34 Flange 35, 36 Rubber plate 37, 38 Holding plate 42 Guide rope

Claims (1)

[Claims] 1. A vacuum nozzle and a vacuum blower are connected to an inlet side of a cyclone catcher for separating water and air, and a drainage pump driven by a pump motor is connected to an outlet side of the cyclone catcher. A drain nozzle is connected to the drain pump, and a check valve is installed in the passage from the cyclone catcher to the vacuum blower to shut off the passage during operation of the drain pump. , A suction filter is installed, a discharge silencer is installed from the vacuum nozzle to the drainage pump, and the above equipment is covered with a soundproof enclosure.
A vacuum device having a vacuum pressure gauge and a control panel for controlling the operation of the vacuum blower and the pump motor; and a power cable of an underground pipe connected between the manholes. The end tube is provided in the insertion tube having the largest diameter among the insertion tubes whose diameters are sequentially increased according to the difference in the diameter of the outlet from which the oil is drawn, and the end plate is provided with a hose connection port communicating with the insertion tube. An attachment, a vacuum hose connected between a hose connection port of the attachment and the vacuum nozzle of the vacuum device, and a conical pressure release valve fixed to one end of the central shaft, inside a cylinder abutting the pressure release valve. A spring receiving piece that is slidably fitted to the center shaft is fixed, and a spring is interposed between the washer fixed to the other end of the center shaft and the spring receiving piece. Cylindrical pressed constantly to the pressure release valve,
Each of the flanges provided on the outer periphery of both ends of the cylinder has a pig having an annular rubber plate having a diameter in contact with the inner wall of the underground pipe replaceably fixed by a holding plate, and a pressure of the central shaft. An electric power cable passing device comprising an open valve side end and a guide rope connected between the end of the electric power cable.