Patent Application
20060277862
This application is based upon Australian Patent Application No. 2004224962 dated Nov. 1, 2004, and published May 26, 2005.
1. Technical Field
An apparatus and a method are disclosed for installation of cables, conduits and the like. The apparatus and method have been primarily developed for use in providing access for cable and conduit installation from a roof top and/or basement of a building to the building interior and will be described hereinafter with reference to this application. However, it will be appreciated that the apparatus and method are not limited to this particular application.
2. Background Art
Cable and conduit installation in multi-storey buildings can be a particularly complex procedure. Existing methods include a continuous cavity cabling method, in which cables are run within the building cavity between the external wall and the internal wall. However, high rise buildings and smaller buildings with specific architectural features (eg. flat roofs with surrounding parapet walls or concrete floor slabs) can prevent implementation of the continuous cavity cabling method. In this and other circumstances, external cabling and conduits can be employed. However, externally mounted cabling and conduits can be aesthetically unpleasant and can potentially impact property values. Building management bodies can, for this reason, refuse cable and conduit installations.
Further, with the advent of pay TV and broadband services, the need for cable installation has increased dramatically.
In a first aspect there is disclosed a method for providing access for cable or conduit installation from a roof top or a basement of a building to the building interior, the method comprising the steps of:
When the term “roof” is employed herein, it should be appreciated that the roof in a given installation may in fact be defined by an overlying floor (eg. in a multi-storey building).
The drilling apparatus may comprise a drill motor and a drill string. The drill string may comprise a drill pipe and a drill bit.
The wall may comprise an inner shell and an outer shell separated by a wall cavity. In this form, the drilling step may comprise drilling a bore that extends from the roof top or basement into the wall cavity, and the at least one aperture may communicate the building interior with the bore via the wall cavity.
The wall may comprise a plurality of cavities between the inner shell and outer shell, the cavities being separated by one or more floor slabs. In this form, the drilling step may comprise drilling a series of axial bore sections through the roof top and each of the floor slabs or, when commenced from the basement, through each of the floor slabs.
The method may further-comprise the step of running a cable or conduit from the roof top or the basement via the bore and aperture to the building interior.
For buildings which comprise a parapet erected above the wall, the drilling apparatus may be mounted above the parapet and the drilling step may comprise drilling a bore through the parapet and into the wall. In this form, the method may further comprise the step of providing a branch hole at the base of the parapet to facilitate access to the bore from the roof top.
The method may further comprise the step of, during the drilling operation, supporting the weight of a drill string in the drilling apparatus, substantially independently of a drill motor of the drilling apparatus.
The method may further comprise the step of preparing an unlevel surface to be drilled within the wall by applying a plastic setting medium to the unlevel surface and substantially levelling the plastic setting medium. The method may further comprise the step of inserting a tamper via the bore and tamping the plastic setting medium substantially level. An opening may be made in the wall either from the building exterior or interior to facilitate installation of the plastic setting medium.
The method may further comprise the step of centring the drill string by lowering a centre point device into the bore, forming an indent in the plastic setting medium with the centre point device as the plastic setting medium sets and centring a drill string of the drilling apparatus on the indent.
The method may further comprise the step of monitoring the drilling operation by means of closed circuit TV cameras within the wall. The closed circuit TV cameras may be passed into the wall via a drill pipe of the drilling apparatus or via the empty bore.
The method may further comprise the step of fixing a tube within a bore section. This step may further comprise providing slots in the tube and pressing sealant from within the tube out via the slots to seal the tube within the bore section. This step may further comprise cutting flaps in to the tube and bending the flaps outwardly to engage surfaces at the top and bottom of the base section. This step may further comprise twisting the tube in the bore hole as the sealant is pressed out.
In a second aspect there is disclosed a drilling apparatus adapted to drill a bore from a roof top or a basement of a building into a wall of the building for cable or conduit access from the roof top or basement, the apparatus comprising:
wherein the support frame is adapted for vertical displacement of the upper portion relative to the lower portion to lower and raise the drill string during drilling.
The drill string may further comprise a drill pipe to which the drill bit can be connected. Multiple sections of drill pipe can then progressively be connected into the string as drilling progresses through each floor, with the drill bit being connected to a first such section.
The support frame upper portion may comprise a mounting plate to which the drill motor can be mounted and at least one jack adapted to raise and lower the plate relative to the lower portion. The support frame may comprise two jacks and two guide pins adapted to uniformly raise and lower the upper portion. The at least one jack may be, for example, a hydraulic jack or a manual jack.
The apparatus may further comprise a thrust bearing supported on the upper portion and adapted to transfer torque from the drill motor to the drill string. The apparatus may further comprise a drill locking chuck associated with the thrust bearing to lock the thrust bearing.
The apparatus may further comprise a closed circuit TV camera adapted to be passed down the drill string (eg. via the drill pipe) to monitor the drilling progress and drilling environment.
The apparatus may further comprise a plastic setting medium dispensing device adapted to be passed down the bore and to dispense a plastic setting medium at a surface to be drilled.
The apparatus may further comprise a tamper adapted to be lowered into the bore for tamping the plastic setting medium and creating a substantially level surface.
The apparatus may further comprise a centre point device adapted to be lowered into the bore and to create an indent in the plastic setting medium as it sets.
The apparatus may further comprise a compressed air spraying unit adapted to be inserted into the bore and to spray paint onto the interior surface of the bore.
The apparatus may further comprise a dispensing device adapted to install and seal a tube within a section of the bore. The tube may have a plurality of slots cut therein to allow sealant to be pressed from within the tube to the tube exterior. The dispensing device may comprise a draw rod attached to a piston rod and piston, a piston housing slidably and axially mounted on the draw rod and adapted to receive the piston rod, and a boss around the piston housing adapted to receive an end of the tube, wherein the boss, tube and piston define a sealant chamber, and wherein drawing the piston rod into the piston housing presses sealant from the sealant chamber out of the tube via the slots. The piston may be a substantially conically shaped piston.
The apparatus and method defined herein have been primarily developed for use in providing access for cable and conduit installation from a roof or basement of a building to the building interior and, whilst primarily being described with reference to this application, are not so limited. In addition, the apparatus and method find broad application with a wide range of cables and conduits including electrical, computing and communications cables, and cables and conduits for utilities and other services, including cables, conduits and pipes for power, water, gas, oil, air and other media.
Specific embodiments of apparatus and methods for installation of cables and conduits will now be described with reference to the accompanying drawings, wherein:
FIGS. 12A-D show examples of images provided by the closed circuit camera of
The multi-storey building has a roof top area 2 above a roof 4. A vertical external wall 6 of the wall comprises an outer shell 8, an inner shell 10 and a wall cavity 12. The wall 6 is interrupted by horizontal floor slabs 14 extending completely through the wall 6, dividing the wall shells 8, 10 and wall cavity 12 into multiple segments.
A solid parapet 16 extends above the wall 6 on the roof top 2. A damp proof flashing 18 is provided in the wall cavity 12, extending outwardly and downwardly from the inner shell 10 to the outer shell 8 adjacent the floor slab 14. The flashing 18 diverts water running down the inner shell 10 in the cavity 12 from the inner shell 10 to the outer shell 8. The wall 6, roof 4 and floor slabs 14 together define a partitioned building interior 20.
In order to provide access for cable or conduit installation from the roof top 2 to the building interior 20, a drilling apparatus 22 having a drill string 24 is mounted above the parapet 16. The drill string 24 comprises a number of lengths of drill pipe screwed together in series and a drill bit at the distal end of the drill string. The drill bit comprises a 500 mm length of drill pipe with a diamond encrusted rim.
In use, the drilling operation is performed to drill a vertical bore 26 through the parapet 16, into the wall cavity 12 and through each of the floor slabs 14, thereby producing a series of axially aligned bore sections separated by the cavity 12. An aperture 28 is created in the inner shell 10 of the wall 6 by drilling, cutting or removing a portion of the inner shell 10. A horizontal branch hole 30 may also be made at the base of the parapet 16 by, for example, drilling with a diamond core drill. This allows a cable or conduit to be installed by running the cable or conduit from the roof top 2, via the branch hole 30, bore 26 and aperture 28, to the building interior 20. Once the branch hole 30 has been created, the bore 26 above the branch hole 30 is no longer required and may be filled in or concealed from above.
During the drilling operation, the weight of the drill string 24 is supported by the material being drilled. However, when the drill string 24 passes through, for example, the parapet 16 or a floor slab 14, the weight of the drill string 24 is borne by the drilling apparatus 22, which may place an excessive load on the drill motor. Therefore, referring to
Unlevel surfaces, such as the flashings 18, may be encountered during the drilling operation. The flashings 18, located above the floor slabs 14 in the wall cavity 12, are inclined relative to the level floor slabs 14 in order to divert water from the inner shell 10 down towards the outer shell 8. When the drill string 24 is lowered to contact the flashing 18, the inclined surface of the flashing 18 may cause the drill string 24 to skate or skew and bend towards the outer shell 8.
Therefore, and referring to FIGS. 4 to 7, a plastic setting medium 50, such as the high bonding material Jetflex (Trade Mark of Sherwin-Williams), is applied to the flashing 18 in the area for drilling to provide a level surface 52. An opening may be created in the outer shell 8 or inner shell 10 of the wall 6 at the flashing site to facilitate application and levelling of the plastic setting medium 50. Sand may be added to the plastic setting medium 50 to aid the drilling thereof. The plastic setting medium 50 is applied via a feed pipe inserted into the bore 26. A tamping rod 54 having a rubber tamper 55 is lowered into the bore to press the setting medium 50 and create a level surface 52. During setting of the setting medium 50, a heavy steel centre point 56 is lowered into the setting medium 50 to create an indent 58 in the medium 50. A centring drill 60 having a masonry bit 62 is used to centre the drill string 24. The masonry bit 62 is aligned and received in the indent 58. The bore 26 can then continue to be drilled through the plastic setting medium 50, flashing 18 and floor slab 14 in continuous axial alignment.
Referring to
The bore 26 may extend through a number of reinforced concrete floor slabs 14, which may make the steel reinforcements in the slab 14 susceptible to corrosion (known as concrete cancer). Further, it is not particularly desirable to have water running down through bore sections 26 when cabling or conduits are installed.
Therefore, referring to FIGS. 9 to 11, a tube 70 and deployment device 72 are provided to install the tube 70 in the bore section 26. The tube 70 is cut to a length that is longer than the bore section 26 into which it is to be inserted, so that the tube projects above the surface of the opening of the bore section 26 to prevent surface water running down the bore. The tube 70 has a plurality of slots 74 cut therein to allow sealant to be pressed from within the tube 70 via the slots 74 to the tube exterior. The tube 70 also has two sets of flaps 76, 78 cut adjacent each end of the tube 70. The flaps 76, 78 are adapted to bend outwardly of the tube 70 and engage the surfaces around the top and bottom of the bore section 26. The bottom flaps 76 catch on the underside of slab 14 and the top flaps 78 are forced outwardly as the sealant is pressed out. The flaps 76, 78 act to anchor the tube 70 within the bore section 26.
The deployment device 72 comprises a draw rod 80 connected to a piston rod 82. A piston housing 86 is slidably and axially mounted on the draw rod 80 and is adapted to receive the piston rod 82. The piston housing 86 further comprises a boss 88 adapted to receive and plug an end of the tube 70 such that the piston 84, tube 70 and boss 88 form a chamber 90.
During application, the tube 70 is mounted on the deployment device 72 and plugged at one end by the boss 88. The chamber 90 formed by the piston 84, tube 70 and boss 88 is at least partially filled with sealant. The deployment device is lowered into the bore section 26 until the bottom flaps 76 pass through the bore section 26 and engage the underside of the slab 14. The draw rod 80 is then drawn upwards, retracting the piston rod 82 into the piston housing 86. This compresses the chamber 90 and forces sealant out of the chamber 90 via the slots 74 and flaps 76, 78. When the piston rod 82 is fully retracted, the piston housing 86 is drawn upwards by the draw rod 80, unplugging the boss 88 from the tube 70 and leaving the tube 70 anchored and sealed within the bore section 26. By twisting the tube 70 as it is inserted, the sealant is spread around the bore surface, improving the seal within the bore. An opening may be made in the inner or outer shell of the wall at the bore section site to assist installation of the tube 70.
FIGS. 12A-D depict examples of images that can be recorded by the camera during the drilling operation, demonstrating how the camera is used to monitor and guide the drilling operation.
The apparatus and method have been described with reference to a specific type of building. However, the apparatus and method may be used on a variety of building types, whether the walls are completely solid, continuous cavity, slab to outside wall and whether or not the building has a parapet. Buildings with balconies allow easy access to the exterior of the wall, for circumstances requiring access to a site within the wall.
The apparatus and method described above enable access for cabling and conduits from a building roof top or basement with minimal effect to the building aesthetics. Cabling and conduits can be provided from the roof top or basement, through the wall to the building interior, without the need for visually displeasing internal or external wiring. The apparatus and method may also be embodied in many other forms.
In the claims which follow and in the preceding description, except where the context requires otherwise due to express language or necessary implication, the word “comprise” or variations such as “comprises” or “comprising” is used in an inclusive sense, i.e. to specify the presence of the stated features but not to preclude the presence or addition of further features in various embodiments of the apparatus and method.
Whilst a number of specific embodiments of apparatus and methods for installation of cables and conduits have been described, it will be appreciated by a skilled person that the installation apparatus and method can be embodied in many other forms.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2004224962 | Nov 2004 | AU | national |
