Supporting articles/loads

1. A locking arrangement for selectively preventing displacement of a tubular support structure relative to an upstanding elongate support, the tubular support structure being concentrically situated around the upstanding elongate support and displaceable lengthways of the upstanding elongate support comprising a first structure selected from a single tapered internally projecting lug, or a recess, a plurality of such lugs or recesses arranged around a predetermined region of the support structure, wherein the elongate support is provided with a complementary shaped structure adapted for respective engagement with said first structure of the tubular support structure in such manner as positionally to locate the support structure with respect to the elongated support when at a lowermost limit of downward movement, and a rigid containment attached securely to an internal tubular surface of the tubular support structure and opening towards the outer surface of the upstanding elongate support, and wherein said containment houses a closely fitting inflatable container mounting a friction member for co-operation with said outer surface in such manner that the inflatable container is contained on three sides of the containment but can expand outwardly to press the friction member against the outer surface of the elongate support in order to exert a grip on the elongate support to prevent lengthways displacement and thereby maintain the support structure and any article/load carried thereby in a required position relative to the elongate support with sufficient force to prevent torsional yawing of the tubular support structure about the elongate support, and apparatus coupled to the tubular support structure for supporting an article/load with respect to the upstanding elongate support.

2. A locking arrangement for selectively preventing displacement of a tubular article/load support structure relative to an upstanding elongate support, the tubular support structure circumscribing the upstanding elongate support and adapted for lengthways displacement along upstanding elongated support, wherein the tubular support structure is provided with a first structure selected from a single tapered internally projecting lug, or a recess, a plurality of such lugs or recesses arranged around a predetermined region of the support structure, wherein the elongate support is provided with a complementary shaped structure adapted for respective engagement with said first structure of the tubular support structure in such manner as positionally to locate the support structure with respect to the elongated support when at a lowermost limit of downward movement, and wherein the tubular support structure incorporates a rigid containment attached securely to an internal tubular surface of the tubular support structure and opening towards the outer surface of the upstanding elongate support, and wherein said containment houses a closely fitting inflatable container mounting a friction member for co-operation with said outer surface in such manner that the inflatable container is contained on three sides of the containment but can expand outwardly to press the friction member against the outer surface of the elongate support in order to exert a grip on the elongate support to prevent lengthways displacement and thereby maintain the support structure and any article/load carried thereby in a required position relative to the elongate support with sufficient force to prevent torsional yawing of the tubular support structure about the elongate support.

3. A locking arrangement as claimed in claims 1 or 2 , wherein the gripper devices are operable between a non-gripping rest position in which the associated tubular support structure can be displaced lengthways of the elongate support, and an operated gripping setting in which the support structure is effectively locked against displacement relative to the elongate support.

4. A locking arrangement as claimed in claim 1 or 2 , further comprising at least one source of compressed gas, or pressurized liquid or fluid delivered from a pressurized plenum supply coupled to said inflatable container.

5. A locking arrangement as claimed in claim 4 , wherein said gripper device comprises a plurality of gripper devices arranged for actuation in groups from separate plenum supplies, whereby if a leak develops in a said plenum supply the leak will only effect the group of gripper devices connected with the associated plenum supply thereby leaving sufficient redundancy for the unaffected groups to achieve the required force necessary for the associated tubular support structure to be securely locked to the upstanding elongate support.

6. A locking arrangement as claimed in claim 5 , wherein the gripping devices are arranged horizontally and circumferentially on the internal surface of the tubular support structure and comprise a plurality of circular containments attached securely to the inner surface of the tubular support structure but open internally where they face the outer surface of the upstanding elongate support, and wherein the containments house closely fitting doughnut-shaped inflatable bags/containers whereby said inflatable bags/containers are contained on three sides above, below and where they contact the inner surface of the support structure.

7. A locking arrangement as claimed in claim 5 , wherein the gripping devices are of an elongate form and are arranged vertically and circumferentially on the internal surface of the tubular support structure and comprise a plurality of rectangular containments attached securely to the inner surface of the tubular support structure but open internally where they face the outer surface of the upstanding elongate support, and wherein the containments house closely fitting rectangularly shaped inflatable bags/containers in such manner that said inflatable bags/containers are contained on three sides above, below and where they contact the inner surface of the support structure.

8. A locking arrangement as claimed in claims 1 or 2 , wherein each gripper device comprises a hydraulic or pneumatic ram or a mechanical screw-jack arrangement.

9. A locking arrangement as claimed in claim 8 , wherein the rams or screw jack arrangements are arranged to operate radially or to drive wedge shaped elements against the elongate support outer surface in such manner as to generate sufficient force against the outer face of the upstanding elongate support so as effectively to lock the support structure to the elongate support whenever it is desired to prevent displacement of tubular support structure relative, to the elongate support.

10. A locking arrangement as claimed in claim 1 or 2 , wherein the tubular support structure sleeve has circumferential flanges serving to reinforce its upper and lower edge regions thereof and to inhibit flexing and distortion.

11. A locking arrangement for selectively preventing displacement of a first tubular support structure relative to an upstanding elongate support, the tubular support structure being concentrically situated around the upstanding elongate support and displaceable lengthways of the upstanding elongate support comprising gripper devices arranged internally and concentrically of the tubular support structure, wherein said gripper devices are operable to cooperate with an outer surface of the upstanding elongate support between a non-gripping rest position in which the associated tubular support structure can be displaced lengthways of the elongate support, and an operated gripping setting in which the support structure is effectively locked against displacement relative to the elongate support in such manner as to prevent lengthways displacement and thereby maintain the support structure and any article/load carried thereby in a required position relative to the elongate support and with sufficient force to prevent torsional yawing of the tubular support structure about the elongate support, and apparatus coupled to the tubular support structure for supporting an article/load with respect to the upstanding elongate support, and including a second tubular structure circumscribing the elongate support for movement lengthways of the elongate support, the second tubular support structure being so interconnected with the first tubular support structure as enable the two tubular support structures to be alternately operated between the locking and unlocked settings at required lengthways positions thereof in such manner as to be able maintain the article/load at a required position relative to the elongate support.

12. A locking arrangement as claimed in claim 11 , wherein means are provided for enabling the two tubular support structures to be controllably displaceable relative to each other with respect to the associated elongate support in such manner that the article/load is continuously supported by/from the associated elongate support during lengthways displacement thereof relative to the associated elongate support.

13. A locking arrangement as claimed claim 12 , wherein the article/load includes at least one turbine installation.

14. A locking arrangement as claimed in claim 11 or 12 , wherein the second tubular support structure is so interconnected with the first tubular support structure as enable the two tubular support structures to be alternately operated between the locking and unlocked settings at required positions in such manner as to turn one of the tubular support structures relative to the other through an angle about an axis of the elongate support.

15. An locking arrangement for selectively causing displacement of a first tubular support structure relative to a second tubular support structure and an upstanding elongate support, the first and second tubular support structures being concentrically situated around the upstanding elongate support and displaceable relative to the upstanding elongate support, the first and second tubular support structures comprising gripper devices arranged internally and concentrically of each tubular support structure, the gripper devices being operable to cooperate with an outer surface of the upstanding elongate support between a non-gripping rest position in which the associated tubular support structure can be displaced relative to the elongate support, and an operated gripping setting in which the associated tubular support structure is effectively locked against displacement relative to the elongate support in such manner as to prevent displacement and thereby maintain the support structure and any article/load carried thereby in a required position relative to the elongate support, and apparatus coupled to at least one of the tubular support structures for supporting an article/load with respect to the upstanding elongate support, the second tubular support structure being so interconnected with the first tubular support structure as enable the two tubular support structures to be alternately operated between the gripping and non-gripping settings at required positions in such manner as to turn one of the tubular support structures relative to the other through an angle about an axis of the elongate support.

16. A locking arrangement as claimed claim 15 , further comprising extendable actuators coupling the first and second tubular support structures to each other, at least some of the extendable actuators being set at an angle to each other.

17. A locking arrangement as claimed claim 16 , further comprising attachments for the ends of at least some of the extendable actuators, the attachments being selected from knuckle and ball and socket joints permitting the actuators to change inclination during the turning of one of the tubular support structures relative to the other.