WO2002030727A1

WO2002030727A1 - Work cart for temporary cableway and a method for use of such work cart

Info

Publication number: WO2002030727A1
Application number: PCT/NO2001/000414
Authority: WO
Inventors: Olav Liodden; Eivind Robert Oen; Hans Kristian NÆSS; Stein Hugo Thorsen
Original assignee: Aak As
Priority date: 2000-10-11
Filing date: 2001-10-11
Publication date: 2002-04-18
Also published as: NO20005122L; GB2383023B; WO2002030727A8; AU2002211106A1; GB0305807D0; GB2383023A; US20040050286A1; NO318380B1; NO20005122D0

Abstract

Vehicle intended to run on a track line comprising at least two track cables (2,A,B,C), the vehicle comprising at least one wheel support (3) intended to run on each track cable (2), and a platform (16) arranged between the wheel supports (3), each of said wheel support (3) comprising at least one wheel (12) to be placed on top of the track cables (2).

Description

WORK CART FOR TEMPORARY CABLEWAY AND A METHOD FOR USE OF SUCH WORK CART

This invention relates to a vehicle to be mounted on a cable line comprising at least two cables, and a system comprising this, and a method for application of such a vehicle on a track line.

Background for the Invention

For maintenance work onshore and offshore it has been a common practice to use scaffolding, thereby providing a working platform for the operators. For maintenance work on large structures, such as bridges and oil platforms, this becomes excessively expensive and work intensive solutions. At the same time, the safety requirements for such type of scaffolding are extremely rigid, making such solution even more expensive.

In particular, for maintenance of the underside of offshore platforms the installation and use of scaffolding are time consuming and expensive, both due to the construction and due to weather and working conditions in general . In addition to the working conditions on the scaffolding, installation and dismantling operations are connected with danger.

Prior Art It is known to apply hanging scaffolding, suspended from wires and which may be moved vertically along walls, used for installation, painting and maintenance works. The known scaffolding may, however, neither be used under overhanging projections, nor along the underside of bridges and the underside of platform decks.

Vehicle with a trolley running on a track cable such as for example a guy line or of mountain lift type having gondolas on a rail cable with a separate pull wire, is also known. It is further known to provide the rail cables for the gondolas with intermediate supports, consisting of cable supports mounted on poles in order to reduce the free lengths, thereby reducing sagging of the track cables. Object of the Invention

The object of the present invention is to provide a more simple solution which is independent of scaffolding, and providing a system which permits work to be performed on the underside of or between large structures. Thus, the invention relates to a vehicle to be installed on a track line, and a cable vehicle system for movement of such vehicle, as further defined in the enclosed claims.

Brief Description of the Drawings The present invention will be described below, referring to the enclosed drawings which illustrate the invention by means of preferred embodiments. Figure 1 is an illustration in perspective of a vehicle according to the invention, suspended from temporary track cables which are installed on the underside of e.g. a deck on an oil platform. Figure 2 is a side view of the vehicle suspended from an inclined track cable. Figure 3 is an end view in perspective of the vehicle, seen along the its platform deck and seen along the track cables. Figure 4a, b and c show various side views of a vehicle according to alternative embodiments of the invention. Figure 5 illustrates a separately installed safety equipment comprising safety wires and corresponding safety harness, as safety against dropping, functioning independent of the present invention. Figure 6 illustrates a cradle compensating for support of the vehicle on inclined track cables. Figure 7 illustrates a wheel support or a trolley running with its wheels on the track cables. Figure 8a, b and c shows a wheel suport passing over a wire support which is fixed by an intermediate anchorage. The arrow shows the direction of motion. Figure 9a and b show alternative embodiments of the wheel support .

Figure 10 shows a view and a partly section of an intermediate anchorage, seen in direction of the wire .

Figure 10b is a perspective view of a track cable system suspended from the underside of horizontal surface under a structure or a construction , with associated safety lines and access route. The overhanging structure or construction is for the sake of clarity not shown.

Figure 11 is a perspective view of an operator operating a driving means according to a preferred embodiment of the invention. Figure 12 is a perspective view of a vehicle and its wire pulling system according to a preferred embodiment of the invention. For the sake of clarity, both the overhanging structure and the track cables are not shown. Figure 13 is a top view of the vehicle according to a preferred embodiment of the invention. Figure 14 is a top view of a vehicle equipped with an alternative driving means according to the invention. Figure 15a, b, c and d illustrate different alternative embodiments of the invention of working platforms assembled with different width, orientation and having varying heights. Figure 16a, b and c illustrate a method for sidewise transfer of the vehicle according to the invention.

Detailed Description of the Invention

Vehicle and Track Line

Figure 1 illustrates a cable vehicle 1 suspended from a track line system comprising at least two cables 2 via a support comprising two wheel supports. Figure 2 is a side view of a vehicle according to a preferred embodiment of the invention where each of the wheel supports 3 are fixed directly or indirectly on poles or columns 14 which preferably are arranged at the corners of the working platform 16 on the vehicle. The poles 14 are equipped with struts 15 in order to provide a secure and stable connection between the working platform 16 and the poles 14. The struts 15 may be fixed directly to the poles 14 or on horizontal brazings fixed to the poles 14 by means of scaffolding couplings, extending between the platform and the wheel support . According to a preferred embodiment the vehicle 1 may be ajusted to a situation where the two parallel extending cables 2 are inclined. This is achieved according to a preferred embodiment by allowing each of the wheel supports 2 to be pivotally arranged on a horizontal axis 9 of a centre bolt in a cradle 21 close to the middle 21 of an upper girder 20 which is mounted in the direction of the wires 2 on the poles 14, on both sides of the platform. A means 8 for adjusting the height or the platform 16 is shown by means of a chain hoist 8 arranged between each of the upper girders 20 or an ear on the lower edge of the cradle 21 and the platform 16. By adjusting the means 8 for adjusting the height differently below the track cables 2 the operator may in addition compensate for difference in height between the two cables 2, so that the vehicle may be kept in a horizontal position. Different embodiments of the means 8 for adjusting the height will be described below, referring to Figures 4a, b and c.

The Platform

The platform 16 may be of a type as disclosed on Figure 3, for instance comprising a plate braced by means of a truss work in order to give the operator 4, for instance a maintenance operator, a stable and secure work station. According to a preferred embodiment of the invention the platform 16 comprises a plate, e.g. with the dimensions 1500 mm x 800 mm, and welded in a between the bottom and the top of a rectangular frame with corresponding outer dimensions and a height of 350 mm, so that the rectangular frame constitute a skirting around the entire platform. According to the embodiment shown the platform is hinged at the lower

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System for driving the vehicle

In order to move the vehicle 1 along the track cables 2, a number of solutions are feasible. As shown on Figures 3, 11, 12, and 13 the means 6 for moving the vehicle comprises two crank winches which are connected with separate pull wires or lines 7, fixes at separate points of connection, in order to pull the vehicle 1 forward. Figure 14 shows the vehicle connected to a separate pull wire 7 and the driving means 6 may be a winch on the vehicle, for example an air driven winch. According to an alternative embodiment of the invention, the driving means may be a remotely operated means, pulling the vehicle by means of a pull wire 7 from the point of suspension. A corresponding driving means may of course be arranged behind the vehicle in order to make it possible to drive the vehicle both ways. Alternatively, the wheel support 3 may be equipped with motors for moving the vehicle along the cables . In such case the vehicle must be provided with a power supply (not shown) .

According to the preferred embodiment of the driving means, there are, due to stability requirements of the vehicle, arranged two crank winches 6, each connected to a separate pull wire or pull rope/line 7, running in parallel with the track cables 2 of the construction which comprises an end fixture for the guidance wire 2 and running twice around the drum of the crank winch and running back along the track cables 2 and are fixed to the end of the wheel support 3 as further shown on Figure 7. On the opposite end of the wheel support 3 , the other end of the pull wire 7 extends to the corresponding winch drum at the opposite fixture for the track cable 2 and back via a yoke 24 on the platform 16 and under the platform 16, back to the crank winch 6. The crank winch 6 is according to the preferred embodiments of the invention movably arranged by means of a horizontally arranged pivoted support structure 6' , pivotally arranged on the shaft of the cradle 9 and, shown ω ω CO to H H

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Figure shows in addition a longitudinally extending cable for the safety system, also shown on Figure 1. The ends of the cables may preferably be fixed at areas equipped with separate access nets with a separate safety cable 5', scaffolding or a safe haven where the operators may enter or leave the platform in a safe manner, and to connect or disconnect the personal safety means onto or from the safety wires 5.

Figure 10 shows an embodiment of an intermediate anchorage 10. The intermediate anchorage comprises a cable support 11, fixed to the cable in any known manner. The main part of the intermediate anchorage is given a ark shaped form, enabling the track guides to be kept in a position straight below the point of anchorage 13 and with the track cable on the upper side of the cable support 11, so that the wheels 12 on the wheel support 3 may roll unaffected over the cable support. A horizontal shaft 18 is fitted in a reinforced horizontal casing at the lower end of the main part of the intermediate anchorage. The shaft 18 runs through the casing and the bow shaped main part 19, and supports a ball bearing 17 and further the cable support 11, so that the entire wheel support 3 with its side plates 3A and 3B may pass over the cable support 11 and the cable 2. The ball bearing may be substituted by a roller bearing or slide bearing. The ball bearing is designed to support the wheel support 3 and relieve the cable 2 when the wheel support 3 passes over the intermediate anchorage 10. According to the preferred embodiment, the wheel support comprises two substantially horizontal side plates 3A and 3B, where one side plate 3B is equipped with a straight or substantially straight lower edge 23, intended to run over the ball bearing 17. According to this embodiment shown on Figure 10, the side plate 3B is intended to run over the ball bearing 17. I such way the ball bearing 17 relieves the cable 2 and the wheels 12 when passing. Thus, unnecessary bending of the cable 2 over the cable support 11 is avoided. It is also possible to arrange an additional ball bearing 17' on the shaft 18, on opposite side of the ball bearing 17 with respect to cable support 11, enabling the side plate 3A CO co O to μ> H

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Vehicle Track cable, support wires (or rail, rope, tube etc.) Wheel support, trolley A Inner wheel support plate on the trolley 3 B Outer wheel support plate on the trolley 3, having a horizontal lower edge 23 extending below the wheel 12, intended to roll on the ball bearing internally of the wire support 11. Operator, the user of the vehicle Safety wire/harness for the operator 4 Driving means for the vehicle 1 ' Support structure for the driving means 6 Pull wire for the driving means 6 Height adjusting means for the platform 16 (pulley system, jacking pulley, ratchet jack, etc.) Shaft for the wheel support/trolley 3 0 Intermediate anchorage 1 Wire support for the track cable/wire 2 2 Wheel on the wheel support to run on the track cable 2 3 A suspension means for the intermediate anchorage 10 on the underside of the construction 4 Pole/column between the platform 10 and the upper girder 20, also carrying the wheel support 3 mounted on a shaft 9 5 Braces for the poles/columns 14 6 Platform on the vehicle 1, intended to be kept in a horizontal position to provide support for operator to work and required equipment . 7 Ball bearing (inner ball bearing) (roller bearing, slide bearing) mounted on the shaft 18 in order to support the outer wheel support plate 3B. (Possible outer ball bearing 17' supporting an inner wheel support plate 3A.) 8 Horizontal shaft on which the ball bearing 17 is mounted 9 Main support of the intermediate anchorage 10 with the wire support 11 at its upper end and the horizontal shaft 18, arranged below the track cable/wire 2. 0 Upper girder intended to support the wheel support 3 on a cradle 21 with shaft 9 and to support the poles/columns 14. 21 Cradle on the upper girder 20 with shaft 9 for the wheel support 3. 22 Guide bushings

23 Horizontal lower edge 23 on the outer wheel support plate 3B.

Claims

1. Vehicle intended to run on a track line comprising at least two track cables (2, A, B, C) , c h a r a c t e r i z e d i n t h a t it comprises at least one wheel support (3) intended to run on each of the track cables (2) , and a platform (16) arranged between the wheel supports (3) , each comprising at least one wheel (12) to be placed on top of the track cables (2) .

2. Vehicle according to claim 1, c h a r a c t e r i z e d i n t h a t at least one of the wheel supports (3) comprises adjustment means (8) for vertical adjustment of the height of the wheel (12) with respect to the platform (16) .

3. Vehicle according to claim 1, c h a r a c t e r i z e d i n t h a t a driving means (6) for moving the vehicle along the track cables (2) .

4. Vehicle according to claim 1, c h a r a c t e r i z e d i n t h a t the driving means (6) is connected to a separate pull wire, a pull rope or a pull line (7) which is extending substantially in same direction as the track cables (2) .

5. Vehicle according to claim 1, c h a r a c t e r i z e d i n t h a t each wheel support (3) comprises at least two wheels (12) to be placed on the track cables (2) .

6. Vehicle according to claim 5, c h a r a c t e r i z e d i n t h a t each pair of wheels (12, 12) is fitted at least on one side plate (3A, 3B) , which side plates (3A, 3B) are pivotally arranged on said wheel support (3) , rotating around a horizontal shaft

(9) arranged perpendicular with respect to the track cables (2) .

7. Vehicle according to claim 1, c h a r a c t e r i z e d i n t h a t it comprises at least four wheel supports (3) , where at least two are intended to run on each track cable (2) , each being equipped with means for adjustment in the vertical direction.

8. Vehicle according to claim l, c h a r a c t e r i z e d i n t h a t the platform (16) is pivotally arranged on the wheel supports (3) about an axis parallel with the track cables (2) at an angle of at least 180°, that the wheel supports (3) are intended to be realeasably connected to the track cables (2) in order to facilitate release from a first track cable (2) and to be connected to a third track cable (2) , running in parallel with the first and the second track cable and having substantially the same distance apart.

9. System for track cable vehicles to be installed on a structure or construction, comprising a vehicle according to one of the preceding claims, c h a r a c t e r i z e d i n t h a t it comprises at least two track cables (2) , which track cables (2) are fixed at their outer ends and preferably at a number of intermediate anchorages (10) , which intermediate anchorages (10) comprise a cable support (11) designed to allow the wheels (12) on the vehicle (1) to pass along the track cable over the cable support (11) .

10. System for track cable vehicles according to claim 9, c h a r a c t e r i z e d i n t h a t it comprises a known safety system with associated, parallelly extending safety wires intended to be fixed to a safety harness on an operator.

11. Method for installing a system for a track cable vehicle according to claim 9, c h a r a c t e r i z e d b y attaching at least one track cable (2) on to a structure, such as a bridge or a platform; attaching a hoist rope to the free ends of the track cables (2) ; pulling the hoist rope and the track cable up to a second point of attachment on the structure and attaching the track cables to said point of attachment; tensioning of the track cables by means of a tensioning means, achieving track cables running in parallel with and at a substantial same level under the structure; hooking a vehicle (1) on to the track cables by setting at least two of its wheel supports (3) having pulley wheels (12) on respective track cables.

12. Method according to claim 11, c h a r a c t e r i z e d i n t h a t use of the vehicle (1) as a working platform by moving it along the track cables (2) along the underside of the structure, enabling the operator to attach intermediate anchorages (10) to the underside of the structure; and attachment of track cables (2) to the intermediate anchorage (10) .

13. Method for transferring a vehicle in a system according to claim 9 in transverse direction of the longitudinal direction of the track cables, the system comprising at least three parallel track cables and in which the vehicle platform is pivotably arranged with respect to the wheel supports around an axis parallel with the track cables at an angle of at least 180°, and in which the wheel supports are releasably connected to the track cables, c h a r a c t e r i z e d i n releasing the wheel support from the track cable being on the opposite side of the direction of lateral transfer, rotating the platform and the released wheel support towards the first unconnected cable in desired direction, and attaching the wheel support on said third track cable.

14. Intermediate anchorage (10), preferably to be used in connection with a cable vehicle system according to claim 9, comprising an upper attachment point (13) to be fixed to an overhanging structure, a bow shaped section extending down from the attachment point (13) to a horizontally arranged shaft (18) having a cable support (11) intended to hold and support the lower side of the track cable (2) , c h a r a c t e r i z e d i n t h a t a ball bearing (17) arranged on the shaft (18) and intended to rotate in order to support an elongated wheel support (3, 3A, 3B) extending along the track cable (2) on a vehicle, where the wheel support comprising wheels (12) rolling on the track cable (2) .

15. Drive system for a vehicle according to claim 4, c h a r a c t e r i z e d i n t h a t at least one crank winch (6) , intended to be connected to a separate pull wire or pull rope/line (7) running in parallel with the track cable (2) over a pulley or a wheel on the structure and runs along the track cable (2) and is attached to the wheel support (3) .

16. Drive system for a vehicle according to claim 15, c h a r a c t e r i z e d i n t h a t the opposite ends of the pull wires (7) are attached to a corresponding pulley at the opposite end fixture of the track cable (2) and back towards the crank winch (6) .

17. Drive system for a vehicle according to claim 16, c h a r a c t e r i z e d i n t h a t the pull wires (7) run from the opposite anchorage via a yoke (24) on the platform (16) and preferably under the platform (16) back to the crank winch (6) .

18. Drive system according to claim 15, c h a r a c t e r i z e d i n t h a t a crank winch (6) may be moved by means of a horizontally arranged, pivotably arranged support (6') rotatably on a shaft on the cradle (9) , thus enabling it to be changed to the end of the vehicle (1) which preferably is in the direction of motion.