JP2009017688A - Laying method of cable - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To lay a cable only with the tractive force of a variable torque traction arrangement installed on the cable lead-out side of a cable laying route while preventing intermittent slippage (pulsation) of all kinds of cable on the route large enough to cause trouble in laying cable. <P>SOLUTION: A guide member 4 for introducing a cable 3 into a laying route 1 is installed on the cable lead-in side 1A of the cable laying route 1, and a variable torque traction arrangement 6 for enhancing the tractive force of the cable 3 up to a predetermined level without causing significant intermittent slippage of the cable 3 is installed on the cable lead-out side 1B of the cable laying route 1. The cable 3 passed through the guide member 4 is introduced through a lead wire 2 into the laying route 1 with a minimum necessary initial tractive force, and then the tractive force of the traction arrangement is enhanced sequentially up to a predetermined level depending on speed drop of the lead wire 2 thus tracking the cable 3 to the lead-out side 1B without causing significant intermittent slippage. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention allows intermittent slipping of all types of cables to the above-mentioned route with only the traction force of the variable torque traction device installed on the cable derivation side of the cable laying route such as a pipeline or a sinusoidal passage so as to hinder the laying ( The present invention relates to a cable laying method that can be pulled laid without pulsation.

While pushing the middle part of the cable with the tip connected to the leading wire previously introduced into the cable laying route such as a conduit or a tunnel to the cable introduction side of the laying route, this cable is connected to the cable derivation side of the laying route. For example, the following patent document 1 previously proposed by the applicant of the present application has been proposed as a general cable laying method that can be laid and installed without causing intermittent sliding (pulsation) of the cable so as to hinder the laying of the cable. The cable laying method described is well known.
Japanese Patent No. 3795994

  In the cable laying method of Patent Document 1, a plurality of cable transfer devices such as a holing machine that positively pushes the middle portion of the cable into the laying route are provided on the cable introduction side in the cable laying route such as a pipeline or a cave. In addition to installing the stand, on the cable outlet side, a traction device for towing the traction cable with the winch via the leading wire is installed, and the difference between the dynamic friction resistance of the introduction cable with respect to the laying route and the traction force of the traction device Is detected as a load torque value of the transfer device and transmitted to the traction device, and the traction force of the traction device is adjusted according to the load condition of the transfer device, and the traction device and the traction device installed at a distance from each other By operating the device in a complex manner using a communication line, the tension of the leading wire (cable pulling force) is always adjusted to move the cable. While maintaining the tractive force following settings of limited, a cable method laying which enables towing cable laying the cable laying route without greatly intermittently sliding cable.

  In Patent Document 1, in addition to a cable pulling device installed on the cable derivation side of a cable laying route such as a pipeline or a cave, a cable transfer device for actively pushing the cable to the introduction side of the laying route is used. Since it is necessary to push the cable to the laying route while automatically increasing and adjusting the cable pushing force of the transfer device according to the increase in dynamic friction resistance between the cable and the laying route, installed on the introduction side, Cables such as triplex cables and communication cables that are generally rigid and flexible and easy to bend can be pushed by the cable transfer device even if they are pushed into the laying route. Since there is no cable, the current general flexible and flexible cable cannot be laid by the cable laying method disclosed in Patent Document 1. Compelling problems there.

  Further, Patent Document 1 detects the difference between the dynamic frictional resistance of the introduction cable with respect to the laying route and the traction force of the traction device as a load torque value of the transfer device and transmits it to the traction device side via a communication line. The cable laying work is cumbersome and cumbersome because it is necessary to make the traction device and the transfer device work in a complex manner using the communication line while finely adjusting the torque (traction force) of the traction device according to the situation. There is an essential and big problem.

  Furthermore, since the conventional example of Patent Document 1 requires a plurality of expensive cable transfer devices on the introduction side of the cable laying route, it is uneconomical in terms of the cost of cable laying work and in terms of location. There is also a fundamental and serious problem that it is difficult, inconvenient and troublesome to handle in all aspects, such as monitoring the overall operating state and maintenance inspection.

  The present invention is capable of intermittently sliding all kinds of cables in the above-mentioned route so as to hinder the laying by only the traction force of the variable torque traction device installed on the cable derivation side of the cable laying route such as a pipeline or a cave. The purpose is to enable traction laying without causing (pulsation).

  An object of the present invention is to provide a cable carrying drum on the cable introduction side of the laying route when the cable connected to the leading wire previously introduced into the cable laying route is pulled and laid in the route. And a guide member that introduces the cable fed out from the drum into the laying route, and on the cable lead-out side of the laying route, a variable torque that can increase the traction force to a predetermined traction force without largely sliding the cable. After installing the traction device and starting to introduce the cable passing through the guide member into the laying route through the lead wire with the minimum necessary initial traction force of the variable torque traction device, the increase in the cable introduction weight and the installation route The traction force of the traction device is reduced to the predetermined traction force in response to a decrease in the speed of the lead wire as the cable's dynamic friction resistance increases. By sequentially enhanced, it could be achieved by having no possible traction to the lead-out side without greatly intermittently sliding cable.

  However, on the cable lead-out side of the laying route, a variable torque traction device that can increase the traction force to a predetermined traction force at a traction limit speed or less that can be pulled without causing the cable to be slid largely and intermittently to the extent that it hinders cable laying is installed, After starting to introduce the cable through the guide member into the laying route through the lead wire with the minimum necessary initial traction force of the variable torque traction device, the cable introduction weight increases and the dynamic friction resistance of the cable with respect to the laying route increases. The traction force of the traction device is sequentially increased to the predetermined traction force according to the accompanying speed reduction of the leading wire, so that the cable is kept below the traction limit speed and the cable is not intermittently slid to the derivation side. It may be towable.

  According to the first aspect of the present invention, on the cable introduction side of the laying route, a cable carrying drum, and a cable introduction guide member such as a cable bending feed shooter for introducing the cable fed from the drum into the laying route; After starting the introduction of the cable through the guide member into the laying route with the leading wire with the minimum necessary initial traction force of the variable torque traction device installed on the cable outlet side, the cable introduction weight is reduced. As the speed of the leading wire decreases as the dynamic friction resistance increases between the cable and the laying route, the traction force of the traction device is gradually increased to the minimum traction force that can be pulled without causing the cable to slide intermittently. As a result, the cable can be laid from the introduction side to the lead-out side far away from the introduction side. Cable transport device for sending down the middle of the cable into the set route, the present invention became not require any.

  Therefore, according to the present invention, it is not necessary to push the intermediate portion of the cable to the cable introduction side of the laying route as in Patent Document 1, and the traction force can be generated without causing the cable installed on the cable outlet side to slide largely intermittently. According to the present invention, the cable of the laying route can be used even with a conventional, low-rigidity, flexible, and flexible cable such as a triplex cable and a communication cable by only using the variable traction force of the variable torque cable traction device that can be increased to a predetermined traction force. It is possible to lay the tractor without unreasonably bending from the introduction side to the derivation side far away, and according to the present invention, the large and expensive multiple cable push-feed transfer devices in Patent Document 1 are unnecessary in the present invention. As a result, the present invention is significantly more advantageous in terms of both cable installation cost and construction site space. Also there is the effect.

  Furthermore, according to the first aspect of the present invention, a decrease in the leading wire speed accompanying an increase in the cable introduction weight and an increase in the dynamic frictional resistance of the cable with respect to the installation route is detected only on the cable outlet side as a decrease in the cable pulling speed. On the basis of the detection result, the cable pulling device can be installed on the same side as the above by gradually increasing the pulling force to the minimum pulling force that does not cause the cable to slide intermittently. (For example, the pulsation dimension of the traction cable is about 4 centimeters or more) Because the cable can be pulled to the cable outlet side without causing a large intermittent sliding (pulsation), as described in Patent Document 1, the cable introduction side and the outlet side that are far away from each other can be used. In the present invention, it is not necessary to lay the cable while communicating the cable pulling cooperation state with each other using the communication line. The excellent benefits of being able to carry out the cable laying work extremely easily and definitely and making the invention significantly easier to handle in all aspects such as monitoring the overall operational status of the cable laying site and maintenance. There is also.

  The concrete effect of the invention of claim 1 is that the outer diameter is 168 mm, the cable weight per unit length is 42 kg / m, and the power cable of the cross-linked polyethylene insulated clothing for withstand pressure of 500 KV is compared at about 5 meters per minute. As a cable pulsation accompanying the expansion and contraction of the leading wire during cable traction, a small pulsation with a pulsation dimension of about 4 centimeters or less is required as a Even if it occurs in the power cable on the way, the actual benefit that it was able to be pulled to the derivation side in about 2 hours and 30 minutes without causing the power cable being towed to intermittently slide (pulsation) so as to hinder its installation. Yes.

  According to the invention of claim 2 of the present invention, in addition to the above-mentioned effects, on the cable lead-out side of the laying route, the traction force is below the traction limit speed at which the cable can be pulled without causing the cable to be slid intermittently so as to hinder cable laying. After installing a variable torque traction device capable of enhancing the traction force to a predetermined traction force, and starting to introduce the cable through the guide member into the laying route through the lead wire with the minimum necessary initial traction force of the variable torque traction device, In response to a decrease in the speed of the leading wire accompanying an increase in the cable introduction weight and an increase in the dynamic frictional resistance of the cable with respect to the laying route, the traction force of the traction device is gradually increased to the predetermined traction force, thereby reducing the cable to the traction limit speed or less. Thus, it was possible to add the effect that the cable could be pulled to the lead-out side without largely sliding the cable.

  Next, an example of the best mode for carrying out the present invention will be described. When an underground cable laying route 1 such as a pipe line or a cave having a total length of about 60O meters is made, it is introduced in advance as shown in FIG. When laying the cable 3 having the tip firmly connected to the rear part of the tough leading wire 2 such as a wire rope in the laying route 1 by the pulling force of the leading wire 2, the cable 3 is dug in the cable introduction side 1A of the laying route 1 On the ground near the manhole m, a cable carrying drum D around which the cable 3 to be laid is wound is installed as shown in FIG.

  In the manhole m, a known cable introduction guide member 4 such as a cable bending feed shooter for bending and guiding the cable 3 fed from the drum D to the underground laying route 1 and a cable disconnection prevention roller 4a are illustrated. On the other hand, in the manhole m on the cable lead-out side 1B of the laying route 1, a cable lead-out guide member 5 such as a pulley and a guide roller for guiding the lead wire 2 toward the ground is shown in FIG. Install as follows.

  The leading wire 2 led out to the ground via the lead-out guide member 5 is wound about eight times on a well-known wire feed-out winch cylinder 7 in a general variable torque traction device 6 installed on the ground as shown in FIG. After that, the surplus length of the towed leading wire 2 can be wound around a well-known sliding drive type leading wire winding drum 7A installed on the ground.

  However, the winch cylinder 7 causes the cable 3 to slide intermittently at a speed that is less than the cable pulling speed of about 5 meters per minute. In order to make it possible to increase or decrease the traction force as needed, a variable torque output shaft (not shown) may be used as a variable torque drive source in the variable torque traction device 6. As a result, the rotational force of the winch cylinder 7, that is, the cable pulling force, can be increased or decreased as necessary without causing the cable to slide intermittently to the extent that the cable laying is hindered.

  That is, as a variable torque drive source in which the variable torque output shaft is connected to the winch cylinder 7, the cable pulling force is obtained without intermittently sliding the cable 3 so as to hinder the laying thereof, the cable weight per unit length, and the pulling cable 3 Based on the dynamic friction resistance between the cable and the laying route 2, a known variable torque drive capable of sequentially increasing to a predetermined traction force capable of being pulled without intermittently sliding (pulsating) the cable being pulled to about 4 centimeters or more. Use the source.

  As the variable torque drive source, for example, the rotational force (torque) of the hydraulic motor in a current general variable torque type hydraulic rotational drive source (variable rotational force hydraulic unit) having a hydraulic pump system and a hydraulic motor system is required. It can be used by changing it by well-known means such as adjusting a relief valve, using an ordinary variable torque electric motor (sliding variable motor), or using an inverter-controlled variable torque rotation drive source. ) Use the prime mover below the cable pulling speed limit and increase or decrease the cable pulling force as necessary.

  The cable 3 to be laid in the present invention is, for example, a cross-linked polyethylene insulating garment for pressure resistance of 500 KV having a conductor size of 1 × 2500 square mm, an outer diameter size of 168 mm, and a cable weight per unit length of 42 Kg / m, and dynamic friction against the laying route. A specific example of the present invention in which a power cable 3 having a coefficient of about 0.25 is prepared and this power cable is introduced and installed in the cable installation route 1 having a total length of about 60 meters will be described.

  The rotational speed of the variable torque rotation drive source in the variable torque traction device 6 is 5% per minute for the traction limit speed at which the cable can be pulled without causing the cable to be slid intermittently so as to hinder cable laying. Considering the slip of the drive source, the rotational speed is slightly higher than the rotational speed of the drive source corresponding to the cable pulling speed of about meters, for example, the maximum rotation corresponding to the pulling speed of about 5.5 to 6 meters per minute. The speed is set, and the power cable having the above specifications can be pulled to the derivation side through the winch cylinder 7 at a cable pulling speed equal to or lower than the pulling limit speed, for example, a pulling speed of about 5 meters per minute.

  Then, the power cable 3 having the above-mentioned specifications with its tip firmly connected to the rear portion of the strong leading wire 2 introduced in advance in the laying route 1 is pulled from the cable introduction side 1A to the lead-out side 1B of the route 1. In laying, the cable introduction side 1A of the laying route 1 includes the drum D around which the cable 3 is wound and the guide member 4 for introducing the cable 3 fed from the drum D into the laying route 1 as described above. The leading end of the cable 3 is introduced into the laying route 1 as shown in FIG.

  On the other hand, the cable lead-out side 1B of the laying route 1 has a cable pulling speed equal to or lower than the pulling limit speed at which the cable 3 can be pulled without causing the cable 3 to slide intermittently so as to hinder the installation, that is, per unit length of the cable 3 to be laid. Based on the weight and dynamic frictional resistance of the laying route, the cable traction force can be increased at a cable traction speed of about 5 meters per minute or less for the above-mentioned traction limit speed set by taking into account many cable laying experiences. The variable torque traction device 6 as described above is installed.

  Next, an example in which the power cable having the above specifications is introduced and installed in the cable installation route 1 having a total length of about 60 meters will be described. First, the variable torque traction device 6 is provided with a known means on the variable torque rotation output shaft. When the winch cylinder 7 is started to rotate and the cable 3 passing through the cable introduction guide member 4 starts to be introduced into the laying route 1 by the variable torque pulling force of the winch cylinder 7 through the leading wire 2, first, the leading wire 2 2, the leading wire 2 resists its own weight and frictional resistance against the laying route while removing the slack by the rotational force of the winch cylinder 7, and the cable 3 connected to the rear portion is indicated by the vertical axis in FIG. 2. It stretches when it starts to pull with a tractive force of about 500 kg.

  The extension dimension of the lead wire 2 is, for example, about 5 meters for a lead wire of about 600 meters, and the cable 3 can start to be pulled as described above by the cable pulling force after the end of the extension of the wire 2. As the introduction weight increases and the dynamic frictional resistance of the cable 3 with respect to the laying route 1 increases, the extension dimension of the leading wire 2 sequentially increases. If the cable 3 is continuously pulled regardless of the increase in the extension dimension, the leading wire is increased. As the cable 2 continues to grow, the cable 3 is pulled.

  As the cable pulling continues, the leading wire 2 continues to pull the cable 3 while continuing to stretch as the introduction weight increases and the dynamic frictional resistance of the cable 3 against the laying route 1 increases. When the load of the cable increases sequentially, the rotation speed gradually decreases. Therefore, this decrease in speed is visually detected on the cable outlet side 1B of the laying route 2 or detected by a tachometer, etc. Based on the results, the cable pulling force by the winch cylinder 7 is sequentially increased on the same lead-out side 1B as shown in FIG. The cable pulling speed of the cable, for example, the cable pulling speed of about 5 meters per minute is so large that the cable installation side 1B, which is about 600 meters away, hinders the installation. I was able to tow in about 2 hours and 30 minutes without missing slide.

  However, when the cable 3 starts to be introduced into the laying route 1, the rotational torque of the current general winch cylinder drive source is reduced by a known means as described above, and the rotational force of the winch cylinder 7 is weakened. The cable 3 that has passed through the introduction guide member 4 starts to be introduced into the laying route 1 with the necessary minimum initial traction force of about 500 kg as shown in FIG.

  Thereafter, according to the decrease in the rotation speed of the winch cylinder 7 with the increase of the cable introduction length, the rotation torque of the winch cylinder drive source is gradually increased by the known means, and the rotation force of the winch cylinder 7, that is, the cable traction force is increased. As the cable introduction length increases, the cable is steadily increased as shown in FIG. 2 so that the cable lays with a large intermittent slide, for example, the traction cable advances and retracts larger by about 4 cm or more. The cable 3 can be stably laid at a predetermined speed equal to or lower than the traction limit speed up to the lead-out side 1A.

  That is, according to the present invention, the power cable 3 having the above specifications passed through the cable introduction guide member 4 is caused by the variable rotational force of the winch cylinder 7 connected to the variable torque rotation output shaft of the variable torque traction device 6 by known means. For example, the laying is performed at the necessary minimum initial traction force of about 500 kg as shown in FIG. 2 through the lead wire 2 in the laying route 1 (pipe) at the necessary minimum initial traction speed of about 3 to 4 meters per minute. Start introducing into Route 1.

  The load of the variable torque traction device 6 increases sequentially with the increase of the cable introduction length thereafter. As described above, the cable traction force of the winch barrel 7 is applied to the cable introduction length at a cable traction speed less than the cable traction limit speed as described above. As the power cable having the above specifications with a dynamic friction coefficient of the cable 3 with respect to the laying route 1 is 0.25, for example, in the case of the power cable having the cable introduction length of about 300 meters, 42 Kg / m × 300 × 0.25 = 3.15 tons, cable introduction length around 600 meters, the cable traction force of about 6 tons is similarly increased as shown in FIG. It was able to be pulled to the cable outlet side 1B of the laying route 1 without a large intermittent sliding.

  In short, according to the present invention, for example, a power cable 3 having an outer diameter of 168 mm, a cable weight per unit length of 42 Kg / m, a pressure-resistant 500 KV cross-linked polyethylene insulating garment and a dynamic friction coefficient of 0.25 with respect to the laying route is provided per minute. As the cable pulsation accompanying the expansion and contraction of the leading wire 2 during cable traction, the pulsation dimension is 4 centimeters from the cable introduction side 1A of the laying route 1 to the derivation side 1B at a relatively high traction speed of about 5 meters. Even if a small pulsation of about a meter or less occurs in the power cable 3 in the middle of towing, the pulsating dimension is, for example, about 4 centimeters or more without causing the power cable being towed to slide intermittently so as to hinder its installation. Pulling smoothly in about 2 hours and 30 minutes to the lead-out side 1B without large intermittent sliding (pulsation) It came.

  The cable laying method according to the present invention can naturally be implemented as a method for laying glass fiber bundles for optical communication in addition to the cables 3 described above.

Explanatory drawing which shows an example of embodiment of this invention Explanatory drawing which shows an example of the cable installation work result by this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Cable installation route 1A ... Cable introduction side 1B ... Cable extraction side 2 ... Lead wire 3 ... Cable 4 ... Cable introduction guide member 5 ... Cable extraction guide member 6 ... Variable torque pulling device 7 ... Winch trunk 7A ... Lead wire winding-up Drum D ... Cable carrying drum m ... Manhole

Claims (2)

  When a cable connected to a leading wire introduced in advance in the cable laying route is pulled and laid in the route, on the cable introduction side of the laying route, a cable carrying drum and a cable fed from the drum are provided. Is installed on the cable lead-out side of the laying route with a variable torque traction device capable of increasing the traction force to a predetermined traction force without causing the cable to slide intermittently. After starting to introduce the cable through the member into the laying route through the lead wire with the minimum necessary initial traction force of the variable torque traction device, the cable introduction weight increases and the dynamic friction resistance of the cable with respect to the laying route increases. By sequentially increasing the traction force of the traction device to the predetermined traction force in response to a decrease in the speed of the lead wire, Laying the cables with no possible traction to the lead-out side without greatly intermittently slide Buru.   When the cable connected to the leading wire introduced in advance in the cable laying route is pulled and laid in the route, on the cable introduction side of the laying route, on the cable carrying drum, the cable fed out from this drum And a guide member that introduces the cable into the laying route, while the cable lead-out side of the laying route has a traction force below a traction limit speed that can be pulled without causing the cable to be slid intermittently to the extent that the cable laying is hindered. Installed a variable torque traction device that can increase the traction force, and started to introduce the cable through the guide member into the laying route via the lead wire with the minimum initial traction force of the variable torque traction device, and then the cable introduction weight The traction is increased in response to a decrease in the speed of the leading wire accompanying an increase in the cable and a dynamic frictional resistance of the cable with respect to the installation route By sequentially enhance traction location to said predetermined traction force, while maintaining the cable below the traction limit speed, cable method of laying that no possible traction to the lead-out side without greatly intermittently sliding cable.

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