JPH1137871A - Apparatus for measuring tension for cable laying - Google Patents

Abstract

PROBLEM TO BE SOLVED: To measure tension accurately by holding a guide case provided with guide rollers in parallel by a specified number of load cells and disposing the guide case at the upper half part of a cable guide path at the stern. SOLUTION: The guide case 15 has a frame 19 for rotatably holding guide rollers 17 arranged in parallel. The guide rollers 17 is pivoted, at a specified pitch, along the upper edge of the frame 19. Four load cells 18 are fixed to the supporting frame 23 of the frame 19 and supports the guide case 15 through an abutting member 24. At the time of cable laying work, a specified length of a cable is hung down from a work boat and the load cell 18 is reset before the cable is fed out. A cable brake is controlled such that the tension of the cable operated from the total load of the load cells 18 falls within a specified range. According to the arrangement, the tension of the cable can be measured accurately regardless of the angle of the cable entering into the water or the track of the cable.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable laying tension measuring device used for laying a cable on a seabed or a lake bottom.

[0002]

2. Description of the Related Art As shown in FIG. 11, a conventional cable laying tension measuring apparatus is configured such that a part of an arc-shaped cable guide member c (side view) provided at the stern of a work boat a is provided as one load cell. The load is applied to the guide member c when the cable e is laid, and the load is applied to the guide member c to determine the tension. The speed of the brake device b and the work boat a is adjusted so that the cable laying tension measured by the load cell d is maintained at a predetermined value, so that the laid cable e is not excessively slackened or overstretched. .

[0003]

However, with this conventional tension measuring device, it is difficult to accurately measure the laying tension due to changes in the water entry angle α of the cable e and the trajectory (movement of the cable e in the left-right direction). Met. That is, the load from the cable e acts on the guide member c in one direction due to the change in the water entry angle α and the trajectory, and an error occurs in one load cell d, and accurate tension cannot be measured. If the tension of the laid cable e is too small, there is a problem in that the cable e may deviate from a predetermined cable laying route due to a tide, or the cable e may be laid in a slack state, and the tension is excessive. When,
There is a problem that it is difficult to embed the laid cable e into the seabed at a predetermined depth.

Accordingly, an object of the present invention is to provide a cable laying tension measuring device capable of accurately measuring a cable laying tension.

[0005]

In order to achieve the above-mentioned object, a tension measuring device for laying a cable according to the present invention is arranged in parallel with each other so that the axial center points are arranged on a circular arc in a side view. A guide case provided with a plurality of guide rollers, the guide case is supported by three or more load cells, and the guide case is provided in an upper half portion of a cable running guide path of a stern shooter having an arcuate side view. Is arranged.

Further, a plurality of vertical guide rods penetrating the guide case in a loosely fitting manner are provided opposite to each other, and a load cell is disposed on the left and right sides of the plurality of pairs of vertical guide rods. The cable runs between the two.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing embodiments.

FIG. 2 and FIG. 3 show an embodiment of a tension measuring device for laying a cable according to the present invention. As shown in FIG. It is provided at the stern of the work boat 1 for laying the cable K.

Here, the work boat 1 will be briefly described. From the bow side, a frame 2 for winding and holding and feeding out the cable K, and a cable descending from above the frame 2 toward the stern. The vehicle includes a guide lane 3, cable brake devices 4 and 4, a measuring instrument 5, track pulling machines 6 and 6, and a stern chute 7. A cable laying tension measuring device E is provided in the upper half of the stern chute 7.

2 and 3, the stern chute 7 includes a pair of left and right arch members 9, 9 descending in a curved shape toward the rear, and a front end of the pair of arch members 9, 9. A connecting member for connecting the left and right ends to each other
27, 27, a vertical rod 10a, a horizontal rod 10b, and an oblique rod 10c, and a support member 10 for supporting and fixing the arch member 9 to the stern.
And a plurality of rollers 11 rotatably connected between a pair of left and right arch members 9 and from the middle to the rear end.
And the tension measuring device E provided between the pair of arch members 9 and 9 and in front of the rollers 11... 12 ...
And Then, a plurality of pairs of vertical guide rods 12
Are defined as cable travel guide paths 8.

The vertical guide rods 12 adjacent to each other in front and rear are
The upper ends are connected to each other by connecting horizontal rods 25. Also,
As shown in FIG. 3, the left-right distance between the vertical guide rods 12 and 12 gradually increases toward the lower half of the stern chute 7.

As shown in FIGS. 3 to 6, the tension measuring device E according to the present invention is arranged such that the axial center points P...
A plurality of guide rollers parallel to each other so that
17 are provided, and four load cells 18 supporting the guide case 15 are provided. That is, the guide case 15 is disposed in the upper half of the cable travel guide path 8.

The guide case 15 has a frame 19 for rotatably holding the guide roller 17.
A pair of right and left mounting members 20 and 20 having an upper edge 13 of an arc shape and a lower edge 14 of a straight line, and lower edges 14 and 14 of a pair of mounting members 20 and 20;
, And a bottom plate member 21 fixed to the bottom surface, and is provided so as to be inclined downward rearward as a whole.

The guide rollers 17 are arranged at a predetermined pitch along the arc-shaped upper edges 13, 13 of the mounting members 20, 20 of the frame 19.
… Is pivoted. The bottom plate member 21 has four through-holes 22 intermediate the guide rollers 17 and 17 in the middle between the front and rear.
Are provided, and four of the plurality of vertical guide rods 12 (described above) stand upright through the through holes 22 in a non-contact manner. That is, two pairs of left and right vertical guide rods 12 penetrate the guide case 15 in a loosely fitting manner.

The four load cells 18 are frame
The guide case 15 is attached to a support frame 23 provided in parallel with the bottom plate member 21 of 19 and is provided on the lower surface side of the bottom plate member 21 via a contact member 24 corresponding to each load cell 18. doing. At this time, each load cell 18 and each contact member 24 are disposed at positions on the left and right sides of the left and right vertical guide rods 12 and near the four corners of the bottom plate member 21.

As shown in FIGS. 2 and 4, the support frame 23 for supporting the guide case 15 in a downwardly inclined manner via the load cells 18 is provided with support members 10, 10 (or a hull) of the stern shooter 7. ) Is fixed to the rear downward inclination. The axial center point P of each of the guide rollers 17 of the guide case 15 and the axial center point P ₁ of each of the rollers 11 provided in the rear half of the cable travel guide path 8 are substantially the same arcuate line. It is desirable to be arranged on 16 above.

As shown in FIGS. 3 to 5, a pair of left and right forked protruding pieces 26, 26 are provided on the lower surface of the front end of the bottom plate member 21 of the guide case 15, and these protruding pieces 26, 26 are provided. A pair of left and right bifurcated protruding pieces 28, 28 are provided on the upper surface of a connecting member 27 (described above) in front of 26 and connecting the front ends of the arch members 9, 9 with each other via a plate material. Then, insert both ends of the connecting piece 29 into the forked protruding pieces 26 and 28 at the front and rear positions,
In addition, the guide case 15 is pivotally attached to the support shaft so as to be swingable. Thereby, the guide case 15 can be maintained at the position while being supported by the four load cells 18 (from below) while allowing slight vertical and horizontal movements.

However, when laying the cable K,
As shown in FIGS. 1, 3 and 7, the tip 31 of the cable K wound around the bow of the work boat 1 passes through the cable guide lane 3 and the caterpillar take-off machine 6 and the like, and the cable of the stern chute 7 It is sent to the traveling guideway 8.

When the tip 31 of the cable K is dropped from the stern chute 7 by a predetermined length M (for example, 1 m), the feeding of the cable K is temporarily stopped, and the measured value of the load measured by the load cells 18 is reduced to zero. set. In other words, the weight of the cable K sliding down the cable travel guideway 8 is canceled, and the difference in the cable K to be laid (cable diameter,
Weight, bending stiffness, etc.).

Next, the stern shooter 7 of the advancing work boat 1
, And the cable K is laid on the water bottom. As shown in FIGS. 1, 3 and 8, the tension T of the cable K passing through the traveling guide path 8 of the guide case 15 has four load cells. The speed of the work boat 1, the speed of the take-off machine 6, the cable brake devices 4, etc. are controlled so that the tension T falls within a predetermined range.

At this time, the water entry angle α of the cable K usually fluctuates in the range of 30 ° to 90 °, but (in a side view arc shape).
The cable running guide path 8 includes guide rollers 17 and rollers.
In 11 ..., the frictional resistance with the cable K is reduced as much as possible, so that there is almost no effect on the tension T due to the frictional resistance. Therefore, the tension can be measured regardless of the water entry angle α.

As shown in FIG. 10, the vertical guide rods 12.
The range of the orbit (movement in the left-right direction) of the cable K passing through the travel guide path 8 is regulated, and the cable K always passes inside the load cells 18. Therefore, accurate tension can be measured regardless of the track of the cable K to be laid.

As shown in FIGS. 8 and 9, the laying tension T of the cable K is determined by Pythagorean theorem according to F = 2T × sin (θ / 2), that is, T = F / 2 × sin. (θ
/ 2). F is the total value of the loads received by the four load cells 18..., And θ is the effective angle of the tension measuring device.

The tension measuring device for laying a cable according to the present invention is not limited to the above-described embodiment. For example, three or five or more load cells 18 may be provided (see FIG. 3).
When three units are provided, two units are arranged at the left and right positions at the front end of the guide case 15, and the remaining one unit is arranged at the left and right intermediate position at the rear end so that the guide case 15 can be stably supported. Conversely, one is arranged at the left and right intermediate position of the front end, and 2
The base may be arranged at the left and right positions at the rear end. Further, it is preferable to provide a vertical guide roller instead of the vertical guide rod 12.

[0025]

Since the present invention is configured as described above,
The following effects are obtained.

(According to claim 1) The guide case 15 is
By supporting the load cells 18 in a stable state with more than one load cell 18, the installation tension can be accurately measured regardless of the water entry angle α of the cable K and the trajectory (movement in the left-right direction) of the cable K. That is, even if the load from the cable K is biased toward a specific portion (for example, the upper right portion or the lower left portion) of the guide case 15, the measured values of the loads applied to all the load cells 18 are always stable. Then, an accurate tension can be obtained from the total value. Also, due to the guide rollers 17 of the guide case 15, there is almost no frictional resistance with the cable K, and the measured tension is not affected by the frictional resistance.

According to the second aspect of the present invention, even if the cable K is laid in a curved shape, the cable K can be reliably passed through the travel guide path 8 by the vertical guide rods 12 penetrating the guide case 15 in a loosely fitting manner. And more accurate measurement of the laying tension can be performed.

[Brief description of the drawings]

FIG. 1 is a side view showing a main part of a work boat equipped with a cable laying tension measuring device according to the present invention.

FIG. 2 is a side view showing a stern shooter.

FIG. 3 is a plan view showing a stern shooter.

FIG. 4 is a side view showing an embodiment of the tension measuring device for laying a cable according to the present invention.

FIG. 5 is a plan view showing a cable laying tension measuring device.

FIG. 6 is a sectional front view showing a cable laying tension measuring device.

FIG. 7 is an explanatory diagram showing a state where a cable tip is hung down.

FIG. 8 is an explanatory diagram showing a state in which a cable is extended.

FIG. 9 is an explanatory diagram showing the tension of the cable.

FIG. 10 is an explanatory diagram showing a track of a cable.

FIG. 11 is a simplified explanatory diagram showing a conventional example.

[Explanation of symbols]

 7 Stern shooter 8 Cable running guideway 12 Vertical guide rod 15 Guide case 16 Arc wire 17 Guide roller 18 Load cell K cable P axis center point

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Nobuyuki Motokoshi 3-1-1, Chifune, Nishiyodogawa-ku, Osaka City Mitsubishi Kansai Kogyo Co., Ltd. Kansai Distribution Center

Claims (2)

[Claims] A guide case provided with a plurality of mutually parallel guide rollers so that an axial center point is disposed on an arc line in a side view, wherein the guide case is provided by three or more load cells. A tension measuring device for laying a cable, wherein the guide case is arranged in an upper half portion of a cable running guide path of a stern chute that is supported and has an arc shape in a side view. 2. A plurality of vertical guide rods penetrating a guide case in a loosely fitting manner, and a plurality of vertical guide rods are disposed on the left and right sides of the plurality of pairs of vertical guide rods. The tension measuring device for laying a cable according to claim 1, wherein the cable is caused to run between the two.