JP5411622B2 - Vehicle runaway prevention device for cable-drawn cars - Google Patents

Description

  The present invention relates to a cable extension vehicle used when a cable such as a telephone line is laid in the ground, and more specifically, the vehicle is pulled backward by the tension of the cable (tow rope) during the cable pulling operation. The present invention relates to a vehicle escape prevention device for preventing escape.

As shown in FIG. 1, a cable such as a telephone line is generally laid in the ground through an underground pipe D that connects _two manholes (a drawing side manhole M ₁ and a sending side manhole M ₂ ). Typical cable laying work is performed as follows.

In the cable laying example shown in FIG. 1, a drawing-side cable extension vehicle (vehicle with reference numeral 1) that draws the tow rope 9 and a feeding-side cable extension vehicle (vehicle with reference numeral 20) that sends the cable 10 are used. , its rear end a retractable side cable extending line vehicle 1 (guide roller 45) while to stop in a state located right above the retraction side manhole M _1, its rear end the infeed side cable extending wire wheel 20 (the guide roller 22) is stopped in a state located right above the infeed side manhole M _2. In the following description, the traction rope 9 and the cable 10 may be collectively referred to as a wire.

On the side of the drawing-in side cable extension wheel 1, the tip side of the pulling rope 9 is fed out from the wire rod drawing means 2 (wire rod winding device 3 and wire rod drawing winch 4) and dropped into the drawing side manhole M ₁ , while the feeding side a cable extending line wheel 20 side, dropped from the cable winding device 21 distally infeed side manhole M ₂ Te unwinding the cable 10.

Then, the tip side of the tow rope 9 dropped into the draw-in manhole M ₁ is guided through the underground pipe D to the feed-side manhole M _2, and the tip of the tow rope 9 is fed into the feed-side manhole M _2. It connects with the start end part of the cable 10 by the side (connection part N). Thereafter, the cable 10 is sequentially fed from the feeding-side cable extension wheel 20 (cable winding device 21) while the pulling rope 9 is being drawn by the wire rod drawing means 2 of the drawing-side cable drawing wheel 1. It is made to pass through the underground pipe D extending from the feeding side manhole M ₂ to the drawing side manhole M ₁ .

  A cable 10 such as a telephone line is formed by bundling a large number of communication lines into one by a covering tube, has a considerable thickness (heavy weight), and is quite long. When the cable 10 is pulled into the underground pipe D by the tow rope 9, considerable tension is generated on the wire (the tow rope 9 and the cable 10) due to the cable weight, frictional resistance due to rubbing, and the like. In particular, when the wire (the pulling rope 9 or the cable 10) is caught on the way during the wire drawing operation, a large tension is generated on the wire (the pulling rope 9).

Incidentally, during the cable laying operations, when the rear end of the retraction-side cable extending line vehicle 1 (guide roller 45) and is positioned right above the retraction side manhole M ₁ as shown in FIG. 1, tow ropes 9 Even if a large tension is generated, although a downward pulling force is generated with respect to the drawing-side cable extension wheel 1, the drawing-side cable drawing wheel 1 is not pulled (moved) rearward.

However, the road conditions and traffic regulations by work site, the retracted side cable extending line vehicle 1 may need to stop away from the retracted side manhole M _1, in that case, as shown in FIG. 2 The tow rope 9 dropped from the wire rod drawing winch 4 of the wire rod drawing means 2 into the drawing side manhole M ₁ is greatly inclined. In the example of FIG. 2, the inclination angle of the stretched rope inclined portion 9a between winding roller R provided in the opening of the wire pull winch 4 and the retracted side manhole M ₁ is approximately 30 °.

As shown in FIG. 2, when the cable pulling operation is performed in a state where the pull-in side cable extension wheel 1 is stopped at a considerable distance from the pull-in side manhole M ₁ , the pulling rope 9 has the rope inclined portion 9 a. Thus, when tension is generated in the pulling rope 9, an action of pulling backward with respect to the drawing-side cable extension wheel 1 (the drawing-side manhole M ₁ side) works. When the cable laying operation is performed, the outrigger 16 is grounded, and when the cable extension car 1 is stopped away from the manhole M ₁ , the wheel stopper 19 is applied to the rear wheel 18 and the pulling rope 9 is retracted. The vehicle 1 is prevented from moving backward as much as possible.

  However, during the cable pulling operation, for example, when the pulling rope 9 and the cable 10 are caught in the middle and a large tension (for example, a tension exceeding 3 tf) is generated in the pulling rope 9, the wire pulling means 2 is pulled in. A vehicle moving force exceeding the stopping force due to the outrigger 16 or the wheel stopper 19 may be generated. In this case, the vehicle 1 moves over the wheel stopper 19 and inadvertently moves backward (moves a considerable distance). There is a fear.

  As described above, if the vehicle 1 carelessly escapes backward, it is extremely dangerous. However, conventionally, there has been no mechanism for reliably preventing the vehicle escape phenomenon due to the excessive tension as described above.

  Accordingly, the present invention provides a vehicle run-out prevention device for a cable-drawn vehicle capable of preventing vehicle runaway (moving a considerable distance) due to excessive tension of a tow rope during cable laying work. It was made for the purpose.

  The present invention has the following configuration as means for solving the above problems.

  In the present invention, a cable-drawing wheel is used in which the wire rod (traction rope and cable) is drawn from the manhole by the wire rod drawing means and the cable is laid in the ground.

  By the way, as explained in the background section above, a general example of laying a cable in the ground using a cable extension car is as follows. First, the tow rope is passed from the pull-in manhole into the underground manhole. The leading end of the tow rope is connected to the starting end of the cable to be laid on the sending side manhole side. Then, the cables are sequentially fed from the feeding side manhole side while pulling the towing rope from the drawing side manhole side by the wire drawing means (for example, the wire drawing winch), and the cable reaches the drawing side manhole from the feeding side manhole. It is inserted through the middle tube.

  Also, during cable laying work, it is preferable to stop the cable-drawn vehicle with the rear end of the vehicle positioned directly above the manhole. In such a case, the tow rope that is dropped into the manhole from the wire drawing-in means (wire drawing-in winch) is greatly inclined. In this way, when the wire rod is pulled in with the tow rope tilted greatly, if the wire rod pulling means is further pulled with the excessive tension generated in the tow rope, the vehicle moving force due to the rope tension When the vehicle exceeds the vehicle stopping force, the vehicle moves backward (runaway).

  Therefore, the present invention is directed to a vehicle runaway prevention device for preventing the vehicle from running backward due to excessive tension generated during wire drawing operation as described above.

  The vehicle runaway prevention device according to the present invention includes a vehicle movement detection means for detecting the start of movement of the vehicle when the vehicle starts moving toward the manhole during the wire drawing operation, and a detection signal from the vehicle movement detection means. And a control device that issues a stop signal to the wire rod drawing means.

  Any vehicle movement detection means may be used as long as it can detect the start of movement of the vehicle when the vehicle has moved to the manhole side. For example, a limit switch or a pressure switch may be used separately from the vehicle. Things can be adopted. In this case, a separate vehicle movement detection means is installed on the road surface in the state of being close to or in contact with a part of the vehicle so that the limit switch and the pressure switch are activated when the vehicle starts moving backward. Can be used. In addition, a vehicle movement detecting means that detects the rotation of a wheel (a front wheel that is not locked in a stationary state) can be employed.

  A detection signal from the vehicle movement detection means is input to the control device, and this control device receives a detection signal from the vehicle movement detection means and issues a stop signal to the wire drawing-in means of the cable extension vehicle. have. The stop signal for the wire drawing-in means may be a vehicle engine (which serves as a hydraulic oil supply source to the hydraulic motor of the wire drawing-in means) or a hydraulic oil valve to the hydraulic motor of the wire drawing-in means. An OFF operation may be used.

  And the vehicle runaway prevention apparatus of this invention is applied when it is necessary to stop a cable extension line vehicle in the state (spaced from the manhole) of FIG. That is, in the case of FIG. 2, the tow rope dropped from the wire drawing means (wire drawing winch) into the drawing side manhole is greatly inclined, and when rope tension is generated during cable drawing work, The action of pulling the wire drawing car backward occurs.

  In view of this, the vehicle runaway prevention device of the present invention can be used when the vehicle movement detection means is separate from the vehicle when the cable laying operation is performed in the state shown in FIG. It is installed at a position where it can be detected that movement has started. In the case where the vehicle movement detection means is incorporated in the vehicle (for example, the one that detects the rotation of the front wheel), the vehicle movement detection means is turned on.

  In this state, the cable pull-in operation is carried out. For some reason, a large tension is generated in the wire (tow rope), and if the cable extension car starts moving toward the manhole due to the wire tension, the vehicle runaway prevention of the present invention is prevented. The device functions as follows.

  That is, when the vehicle starts moving backward (when the vehicle moves slightly backward), the vehicle movement detection means detects the vehicle movement start, sends the detection signal to the control device, and the control device draws the wire rod. Operates to stop means immediately. Then, the wire drawing operation by the wire drawing means is stopped (no wire rod tension is lost), the vehicle moving action due to the wire rod tension is lost, and the vehicle immediately stops (the vehicle does not move backward anymore).

  As described above, when performing the cable pull-in work in a state where the cable extension car is separated from the manhole, if the vehicle runaway prevention device of the present invention is used, even if the vehicle starts to move due to wire tension for some reason, The wire rod retracting means can be immediately stopped by the vehicle movement detecting means and the control device. If the wire drawing-in means is stopped, the drawing wire does not have a tension and the rear pulling force on the vehicle is lost.

  Therefore, when the vehicle runaway prevention device of the present invention is used, the wire drawing-in means can be stopped when the vehicle slightly moves backward due to the wire tension, so that the vehicle is stopped immediately after the vehicle moves slightly backward. It is possible to prevent the vehicle from inadvertently running away (moving backward a considerable distance) (preventing safety).

It is a normal usage method explanatory drawing of a cable wire drawing car. It is a usage explanatory drawing of the cable extension vehicle in the state which left | separated and stopped the cable extension vehicle from the manhole. It is a usage explanatory drawing of the cable extension vehicle which uses the vehicle runaway prevention apparatus of an Example of this application. FIG. 4 is a plan view of the cable extension wheel of FIG. 3. FIG. 4 is an enlarged view of the vehicle escape prevention device of FIG. 3.

  Hereinafter, with reference to FIGS. 3-5, the vehicle runaway prevention apparatus of the cable extension vehicle of an Example of this application is demonstrated. In the following description of the embodiment, FIG. 1 and FIG. 2 described above are also used.

  The cable extension wheel used in the embodiment of the present application (FIGS. 3 to 5) is the same as that shown in FIGS. 1 and 2, and is provided with a loading platform 12 on the frame 11 of the vehicle 1. A wire rod retracting means 2 comprising a wire rod winding device 3 and a wire rod retracting winch 4 is mounted. The wire winding device 3 is installed on the back side of the loading platform 12, and the wire rod retracting winch 4 is installed near the rear end on the loading platform 12.

  The cable extension wheel used in this embodiment (FIGS. 3 to 5), as shown in FIG. 2, feeds out or draws in the tow rope 9 connected to the starting end of the cable 10 to be laid. The wire that is the object of drawing and drawing in the cable-drawing wheel is the tow rope 9.

  The wire rod winding device 3 is configured to reversibly rotate a reel 31 for winding the pulling rope 9 by a hydraulic motor 32 (FIG. 4). Two guide rollers 35 are installed near the rear side of the reel 31.

  The wire lead-in winch 4 is configured such that a roller 41 for winding the pulling rope 9 can be reversibly rotated by a hydraulic motor 42 (FIG. 4). In the vicinity of the rear side of the roller 41, a guide roller 45 is attached at a position protruding rearward from the rear end of the loading platform 12. The guide roller 45 can be stored on the loading platform 12 side when not in use.

  3 to 5, reference numeral 6 is a control device, reference numeral 13 is a hydraulic unit installation portion, reference numeral 16 is an outrigger, reference numeral 17 is a front wheel of the vehicle, reference numeral 18 is a rear wheel of the vehicle, and reference numeral 33 is A hydraulic oil valve to the hydraulic motor 32 of the wire rod winding device 3, a hydraulic oil valve 43 to the hydraulic motor 42 of the wire rod retracting winch 4, and a control panel 60 of the controller 6.

Vehicle runaway prevention device of the present application is to use the pull-side cable extending line vehicle 1 when performing a cable entry work while being parked away from the retracted side manhole M _1. That is, if there is no limit to the stop position of the cable extending line vehicle, its rear end a retractable side cable extending line vehicle 1 as shown in FIG. 1 (guide roller 45) is located directly above the pull-in side manhole M ₁ However, if the pull-in side cable extension car 1 cannot be stopped at the position closest to the manhole due to road conditions, the pull-in side cable extension car 1 is moved from the pull-in side manhole M ₁ as shown in FIG. It is necessary to stop at a predetermined distance. In this case, the tow rope 9 dropped from the wire rod drawing winch 4 of the wire rod drawing means 2 into the drawing side manhole M ₁ is greatly inclined. In the example of FIG. 2, the inclination angle of the rope inclined portion 9a which is stretched from the wire pull winch 4 between winding roller R provided in the opening of the retraction side manhole M ₁ becomes approximately 30 °.

Then, as shown in FIGS. 2 and 3, when the cable drawing work is performed in a state where the drawing-side cable extension wheel 1 is parked away from the drawing-side manhole M ₁ , the above [Invention is to be solved]. As described in the section of “Problems”, if a large tension is generated in the pulling rope 9 for some reason (for example, when the drawn wire is caught in the middle), the vehicle 1 escapes backward due to the tension (a considerable amount) There is a risk of moving backward. When the cable pulling operation is performed in the state of FIG. 2, the outriggers 16 and 26 of the respective cable extension cars 1 and 20 are grounded, while the wheel stopper 19 is attached to the rear wheel 18 of the draw-in cable extension car 1. Is applied to prevent the vehicle from moving backward as much as possible. However, if the rear pulling force due to the tension of the tow rope 9 becomes larger than the stopping force of the vehicle, the vehicle 1 escapes backward (the rear wheel 18 is moved to the wheel). Get over stop 19).

  Therefore, in this embodiment, when the cable pull-in operation is performed in the state of FIG. 2, the vehicle escape prevention device shown in FIGS. 3 to 5 is used.

  In the vehicle runaway prevention apparatus of this embodiment, as shown in an enlarged view in FIG. 5, the lower end portion of the swinging rod 52 having a predetermined length is placed on the rectangular base plate 51 having a predetermined area, and the pivot pin 53 is used. On the other hand, the vehicle movement detecting means 5 provided with a limit switch 54 which is turned on and off by the swinging posture of the swinging rod 52 on the base plate 51 is employed.

  The position of the pivot pin 53 that pivotally supports the lower end portion of the swinging rod 52 is slightly displaced from the center of gravity of the swinging rod 52 in the upright posture of the swinging rod 52. In the upright posture, the swinging rod 52 tilts to the left side (the vehicle front side) in FIG. 5 due to the weight of the swinging rod itself.

  An operation member 55 for turning ON / OFF the limit switch 54 is provided at a position near the base end of the swinging rod 52. The operating member 55 is placed on the limit switch 54 in the upright posture state (the state shown by the solid line in FIG. 5) in which the swinging rod 52 swings to the left side (front side of the vehicle) under its own weight, and the limit switch 54 is turned off. On the other hand, if the swinging rod 52 tilts to the right (rear side of the vehicle) as shown by the chain line (reference numeral 52 ') in FIG. The switch 54 is turned on (or turned off).

  The swinging rod 52 can swing back and forth within the range of the upright posture shown by the solid line in FIG. 5 and the laterally tilted posture indicated by reference numeral 52 ″. As shown in the drawing, the weight balance of the swinging rod shifts to the rear side when it is slightly tilted to the rear side, and then falls to its side position (position 52 ″) by its own weight. When the swinging rod 52 is in the upright posture, a moment is exerted to swing the swinging rod 52 forward (left side in FIG. 5) due to its own weight. However, in the upright posture, the operation member 55 is placed on the limit switch 54. Therefore, the swinging rod 52 does not tilt further forward (left side).

  An electric wire 56 having a predetermined margin length is extended from the limit switch 54. A connector 56 a (FIG. 5) is attached to the tip of the electric wire 56.

  The vehicle movement detecting means 5 of this embodiment is installed and used on the road surface in the state of being close to (or in contact with) the rear end surface of the side guard 14 provided near the center of the side of the vehicle 1 as will be described later. In this regard, an electric wire 61 extends from the control device 6 on the vehicle 1 side to the vicinity of the rear end portion of the side guard 14. A connector 61a (FIG. 5) for connecting the connector 56a on the vehicle movement detection means 5 side is attached to the tip of the electric wire 61. The connector 61a is located near the center of the side surface of the vehicle frame 11. It is fixed. The mounting location of the connector 61a may be the lower surface of the loading platform 12.

  The control device 6 has a function of receiving a detection signal from the vehicle movement detection means 5 and outputting a stop signal to the wire rod retracting means 2 (the wire rod winding device 3 and the wire rod retracting winch 4). As a means for stopping the wire rod retracting means 2 (the wire rod winding device 3 and the wire rod retracting winch 4), the engine serving as a hydraulic operation source may be stopped, or the rope winding device 3 and the rope retracting winch 4 may be stopped. The hydraulic oil valves 33 and 43 (see FIG. 4) for controlling the hydraulic motors 32 and 42 may be turned off.

  The vehicle runaway prevention device of this embodiment may be one in which the vehicle movement detection means 5 is used only on one side of the vehicle 1, but the two vehicle movement detection means 5, 5 are arranged on the left and right sides of the vehicle 1 as shown in FIG. If it is used for each part, the detection accuracy when the vehicle moves backward becomes good.

Vehicle runaway prevention device of this embodiment is intended to be used when performing cable entry work retraction side cable extending line vehicle 1 while being parked away from the retracted side manhole M ₁ as shown in FIG. 3, the following It is installed like this.

  That is, as shown in FIGS. 3 and 5, the swinging rod 52 of the vehicle movement detecting means 5 is in the upright posture (the upright posture is maintained by the weight of the swinging rod 52). The base plate 51 is installed on the road surface so that 52 is close to (or in contact with) the rear end surface of the side guard 14, and the connector 56a on the vehicle movement detecting means 5 side is connected to the connector 61a on the vehicle 1 side ( The state of FIG. At this time, the limit switch 54 is pushed down by the operation member 55, and this pushed-down state will be described as an OFF state of the limit switch 54.

  When the vehicle movement detection means 5 is used as a pair on the left and right, the vehicle movement detection means 5 and 5 are installed on both the left and right sides of the vehicle 1, and the connectors are similarly connected to each side. At this time, the outrigger 16 is grounded and a wheel stopper 19 is attached to the rear side of the rear wheel 18.

Then, the leading end side of the pulling rope 9 fed from the wire winding device 3 is wound around the roller 41 of the wire pull-in winch 4 an appropriate number of times (for example, three times), and then provided at the opening of the pull-in manhole M ₁ . While dropping into the pull-in side manhole M ₁ via the winding roller R, the leading end of the pulling rope 9 is guided to the feed-side manhole M ₂ through the underground pipe D as shown in FIG. , plunge the infeed side cable extending wire wheel 20 to feed was the cable 10 the distal end side in the infeed side manhole M ₂ of the tip of the tip portion and the cable 10 of the towing rope 9 in said transmission that includes side manhole M ₂ Are connected to each other (connecting portion N).

  In this state, in the draw-in side cable drawing wheel 1, the pulling rope 9 stretched between the wire drawing winch 4 and the winding roller R is inclined (rope inclined portion 9a), and the wire drawing means 2 ( Due to the wire tension generated when the wire rod winding device 3 and the wire rod pull-in winch 4) are operated, the pull-in side cable extension wheel 1 is subjected to an action of being pulled rearward.

  If for some reason (for example, when the towing rope 9 or the cable 10 is caught in the middle), a tension greater than the stopping force of the vehicle 1 is generated on the towing rope 9, the vehicle 1 is caused to move into FIG. As shown in the chain line, the vehicle moves backward (the rear wheel 18 rides on the wheel stopper 19). At the start of the movement, the side guard 14 (reference numeral 14 ') moves the swing rod 52 of the vehicle movement detection means 5 to the rear side. Pushing (the swinging bar slightly tilts as indicated by reference numeral 52 '), the operating member 55 is separated from the limit switch 54 and the limit switch 54 is turned on.

  Then, an ON signal (vehicle movement detection signal) from the limit switch 54 is transmitted to the control device 6, and a stop signal (engine stop) from the control device 6 to the wire rod retracting means 2 (the wire rod winding device 3 and the wire rod retracting winch 4). Signal or an OFF signal to each hydraulic oil valve 33, 43) is issued, and the wire drawing-in means 2 immediately stops. When the wire rod retracting means 2 stops, the tension of the pulling rope 9 is lost at that time. Thus, when the tension of the tow rope 9 is lost, various braking forces (braking force to the rear wheel 18, rearward movement preventing force by the wheel stopper 19, frictional force by the outrigger 16, etc.) act on the vehicle 1. Therefore, even if the vehicle 1 stops immediately and the vehicle 1 moves backward due to excessive tension of the tow rope 9, the moving distance is very small, and the vehicle 1 runs away greatly (a considerable distance). Never move backwards). The moving distance from the start of movement of the vehicle 1 to the stop thereof is about several centimeters (for example, within 10 cm), and there is almost no danger due to the backward movement of the vehicle 1.

  As described above, when the cable drawing work is performed under the condition that the cable-drawn vehicle may move backward due to the excessive tension generated in the towing rope 9, by using the vehicle escape prevention device of the present application, the vehicle 1 Can be prevented from inadvertently running away (moving backward a considerable distance), and safety can be ensured.

  In this embodiment, the vehicle movement detecting means 5 detects the movement of the vehicle 1 by detecting the swing displacement of the swing bar 52 with the limit switch 54 as shown in FIGS. In other embodiments, for example, a pressure switch is provided on the wheel stopper 19 so that the pressure switch operates when the rear wheel 18 rides on the wheel stopper 19. Alternatively, it is possible to employ a detection means for detecting the rotation of the front wheel 17 (which is not locked when the vehicle is stopped) and detecting the rearward movement of the vehicle 1 by the front wheel rotation detection means.

  1 is a vehicle, 2 is a wire rod drawing device, 3 is a wire rod winding device, 4 is a wire rod drawing winch, 5 is a vehicle movement detecting device, 6 is a control device, 9 is a tow rope, 10 is a cable, 14 is a side guard, 52 is a swing rod, and 54 is a limit switch.

Claims (1)

A vehicle runaway prevention device used for a cable extension vehicle in which a wire rod is drawn from a manhole by a wire rod drawing means and a cable is laid underground.
While having a vehicle movement detecting means for detecting the movement start time of the vehicle when the vehicle starts moving toward the manhole during the wire drawing operation,
A control device that receives a detection signal from the vehicle movement detection means and issues a stop signal to the wire rod drawing means;
A vehicle runaway prevention device for a cable-drawn vehicle characterized by that.

Images