A reusable base for a trolley-assist system for mining vehicles

Abstract

A reusable base 100 for a trolley-assist system for mining vehicles 316, the base comprising: a base member 102; and a support portion 106 that is integral to the base member, and couplable to a suppo

Description

Technical Field The present disclosure relates to a reusable base for a trolley-assist system for mining vehicles. In use, such a reusable base is free-standing with respect to a support surface. The present disclosure also relates to a reusable base system for a trolley-assist system, a trolley-assist system for mining vehicles, a method of assembly of such a trolley-assist system, and a mining hauling system. Background A trolley-assist system is a system in which mining vehicles, such as haul trucks, in open pit mines, are propelled by electrical power along a mining vehicle haul road. This is known to be advantageous because the use of electrical power leads to high savings on fuel costs and reduced CO2 emissions in comparison to well-known systems that may use diesel fuel. However, these improved trolley-assist systems still require a substantial amount of installation and maintenance to fulfil such advantages. In particular, when using these trolleyassist systems, the mining vehicle haul roads must be adequately maintained, because uneven surfaces, for example, can lead to oscillations which can damage some components of the system. It is known to provide a support structure for a trolley-assist system, such as a pylon, with a foundation block or base member that is permanently fixed to the support surface, such as a mining road surface. These foundation blocks provide a rigid and strong support for the pylon. However, if the mining track or road for the mining vehicle needs to be adjusted or moved, a completely new foundation block may need to be implemented at the new location and the original foundation block may need to be destroyed. This is a costly process and may result in a large quantity of waste material. As a result, it would be desirable to provide a trolley-assist system that is more portable and modular than existing systems. Summary of the Disclosure Embodiments described herein provide a reusable base for a trolley-assist system for mining vehicles, a reusable base system for a trolley-assist system, a trolley-assist system for mining vehicles, and a method of assembly for the trolley-assist system as defined in the appended independent claims, to which reference should now be made. Preferred or advantageous features of the disclosure are set out in the dependent claims. The present disclosure relates to a reusable base for a trolley-assist system for mining vehicles. The reusable base may comprise a base member. The base may comprise a support portion. The support portion may be integral to the base member. The support portion may be coupleable to a support structure of a trolley-assist system. The support portion may be releasably coupleable to a support structure of a trolley-assist system. The support portion may be configured to receive a support structure of a trolley-assist system. In use, the base may be free-standing. In use, the base may be free-standing with respect to a support surface. According to a first aspect of the present disclosure, there is provided a reusable base for a trolley-assist system for mining vehicles. The reusable base comprises a base member. The base comprises a support portion. The support portion is coupleable to a support structure of a trolley-assist system. In use, the reusable base is free-standing with respect to a support surface. The reusable base may not be coupled or attached to a support surface. The reusable base may not be permanently coupled or attached to a support surface. In other words, the reusable base may be configured to rest on a support surface. The reusable base according to the first aspect advantageously provides a trolley-assist system that is more portable and reusable. This is because the free-standing nature of the base with respect to the support surface, allows the base to be installed and then easily relocated and re-used without the need for detaching the base from the support surface. The support surface may be the ground of the mine or the surface of, or adjacent to, a mining vehicle haul road. As a result, the reusable base can be relocated and placed in a required position during assembly of a trolley-assist system. Once the reusable base is in position, a support structure can then be releasably coupled to the support structure. The present inventors have recognised and appreciated that the terrain of the ground, support surface or mine, and the entry and access roads of the site, can change over time. Therefore, providing a reusable base that fulfils the required function of supporting the support structure of a trolley-assist system while also being capable of being more easily relocated and adjusted, in the event the terrain of the support surface changes, is advantageous. It allows for a trolley-assist system that is adaptable and flexible to environmental changes. The portability and reusability of the reusable base is further advantageous because it reduces material waste and costs compared to existing arrangements, whereby at least the foundation block or base member is permanently fixed to the support surface and cannot be reused or relocated. Therefore, in such arrangements, a new foundation base has to be used if the location needs to be adjusted due to changes in the terrain or mining vehicle haul road or if the trolley-assist system requires relocation. The present disclosure also relates to a reusable base system for a trolley-assist system for mining vehicles. The system may comprise a reusable base according to the first aspect. The system may further comprise an anchor base. The anchor base may comprise a base member and a support portion. The base member of the anchor base may be referred to as an anchor base member. The support portion of the anchor base may be referred to as an anchor support portion. The anchor support portion may be integral to the anchor base member. The anchor base may be configured to be coupled to a support structure of a trolley assist system that is supported by the reusable base. The anchor support portion may be configured to be coupled to a support structure of a trolley assist system that is supported by the reusable base. The anchor support portion may comprise a flange. The flange may be integral to a second end of the anchor support portion. The anchor support portion may comprise an anchorage plate. The anchorage plate may be releasably coupled to the flange. Alternatively, the anchorage plate may be integral to the flange. The anchor support portion may comprise a bracket. The bracket may provide a coupling point such that the anchor support portion may be configured to be coupled to the support structure of the trolley assist system. The bracket may be integral to the anchorage plate. The anchor base may provide one of a compressive force or a tensile force to said support structure. The anchor support portion may provide one of a compressive force or a tensile force to said support structure. In use, the anchor base may be free-standing. In use, the anchor base may be free-standing with respect to a support surface. According to a second aspect of the present disclosure, there is provided a reusable base system for a trolley-assist system for mining vehicles. The system comprises a reusable base according to the first aspect. The system further comprises an anchor base. The anchor base comprises a base member and a support portion. The support portion of the anchor base (or anchor support portion) is configured to be coupled to a support structure of a trolley assist system that is supported by the reusable base. In use, the anchor base is free-standing with respect to a support surface. The base member of the anchor base may be referred to as an anchor base member. The support portion of the anchor base may be referred to as an anchor support portion. Advantageously, the present disclosure according to the second aspect provides a reusable base system comprising the reusable base according to first aspect, and as such has the advantages of the reusable base discussed above with respect to the first aspect. Further, the reusable base system comprises an anchor base. The anchor base may be a reusable base. Similar to the reusable base of the first aspect, the anchor base is free-standing with respect to a support surface. This is advantageous because it also allows the anchor base to be installed and then easily relocated and re-used if needed. The present inventors have recognised and appreciated that the terrain of the ground, support surface or mine, and the entry and access roads of the site, may change over time. Therefore, providing a reusable base system for a trolley-assist system for mining vehicles that fulfils the required function of supporting the support structure while also being more easily relocated is advantageous. Furthermore, the anchor base can be provide additional support to the support structures supported on the reusable bases. Such additional support may be provided in the form of a tensile force or a compressive force to a support structure. The portability of the reusable base system is advantageous because it also reduces material waste and costs compared to the known prior art, whereby the foundation block or base is destroyed and a new block or base is used if the location needs to be adjusted. The anchor base may not be coupled or attached to a support surface. The anchor base may not be permanently coupled or attached to a support surface. In other words, the anchor base may be configured to rest on a support surface. The anchor base member may have the same features or characteristics as the base member of the reusable base described in the present disclosure. The anchor base member may be identical to the base member of the reusable base described in the present disclosure. The anchor base and the reusable base differ primarily in that the reusable base is configured to have a support structure mounted thereon and an anchor base is configured to provide support to a support structure that is mounted on a reusable base. An anchor base may not have a support structure of a trolley-assist system mounted directly thereon. The base member or anchor base member may not be coupled or attached to a support surface. The base member or anchor base member may not be permanently coupled or attached to a support surface. In other words, the base member or anchor base member may be configured to rest on a support surface. The base member or anchor base member may comprise at least two sections. This provides a base member or anchor base member that is modular. Advantageously, this provides a base member or anchor base member that can be easily relocated and transported. Further, this may allow a section to be replaced in the event of a fault, rather than having to replace the whole base member or anchor base member. The at least two sections may be identical to each other. The at least two sections of the base member or anchor base member may be releasably securable to one another. This advantageously provides at least two sections which can be secured to one another when needed, to provide a stable base support for a support structure of a trolley-assist system, but that can be independently moved and arranged. As each section can be transported individually, this may reduce the burden on the equipment used to transport the reusable base. In other words, the weight of the required equipment required to lift and transport the reusable base can be reduced. For example, a 60 tonne crane could be used instead of a 100 tonne crane that would be required if the base was a single integral part. In the present disclosure, 1 tonne refers to 1,000 kilograms (kg). The at least two sections of the base member or anchor base member are releasably securable to one another by connecting means. The connecting means may secure, couple or connect the at least two sections together. The connecting means may ensure that the at least two sections are secured to each other and reduce any excessive relative movement between or amongst them. The connecting means may comprise one or more bolts. However, a skilled person will appreciate that alternative suitable connecting means may be used. Each section of the base member or anchor base member may comprise a connecting hole extending therethrough. The connecting hole of each base member section may be configured to align with each other during assembly of the base member or anchor base member. The sections of the base member or anchor base member may be secured together by engaging the connecting means with aligned connecting holes of the base member sections in order to form the base member or anchor base member. The connecting means may comprise a bolt. The connecting means may comprise a bolt and a corresponding nut. The at least two sections may be configured to engage with each other. The at least two sections may be configured to interlock. Providing at least two interlocking sections ensures the sections remain secure or coupled to one another and can reduce any relative movement between or amongst the sections of the base member or anchor base member. Interlocking the at least two sections may also reduce the burden or reliance on the or a connecting means. The at least two sections may be shaped such that they interlock. The at least two sections may be identical. The support portion may be coupled to the base member or anchor base member. The support portion may be releasably coupled to the base member or anchor base member. The support portion may be integral to the base member or anchor base member. The support portion may be permanently coupled to the base member or anchor base member. The support portion and the base member or anchor base member may form a single unit. The support portion may protrude or extend from the base member or anchor base member. The support portion may protrude or extend upwardly from the base member or anchor base member. The support portion may protrude or extend from an upper surface of the base member or anchor base member. The support portion may comprise a column or a tube. The column or tube may protrude from an upper surface of the base member or anchor base member. The base member or anchor base member may comprise a recess or opening for receiving the support portion. The support portion may be configured to be releasably coupled to a support structure of a trolley-assist system. The support portion may be configured to be releasably coupled directly to a support structure of a trolley-assist system. This may advantageously provide a modular assembly for the trolley-assist system. This removes the need to transport the reusable base member or anchor base member and the support structure together, as a single unit. Further, this may provide for more flexibility or adjustability with regard to the height of the support structure. In other words, as the support structure and the support portion are not integrally formed, the support structure can more easily be adjusted and replaced if needed. If there is a failure or maintenance is required for only one of the support portion or the support structure, that one part can easily be replaced. Therefore, this may reduce maintenance costs and material costs. The support portion may be offset from a central axis of the base member or anchor base member. In other words, the support portion may be off-centre. This may advantageously provide a counterweight to a support structure that is connected to the support portion of the reusable base. This is particularly relevant where the support structure comprises a column and a beam extending away from the column, which is configured to support various components including an overhead power line over the mining vehicle haul road. This may assist in ensuring the support structure remains in the desired orientation, which is preferably vertical and substantially perpendicular with respect to the base member. The support portion may comprise a base column. The support portion or the base column may comprise a flange configured to be releasably coupled to a support structure of a trolleyassist system. The flange may allow the support portion or base column and support structure to be easily assembled and dismantled from one another and provide a suitable contact point between both parts. The flange of the support portion may be configured to be releasably coupled to a flange of the support structure using connecting means. The connecting means may be at least one bolt and at least one corresponding nut. The support portion of an anchor base member may be coupled to a support structure of a trolley-assist system. The support portion of an anchor base member may be coupled directly to a support structure of a trolley-assist system. The reusable base system may comprise an anchor support member. The anchor support member may be configured to couple to the support portion of the anchor base member at a first end and to a support structure of a trolley-assist system at the opposite, second end. In other words, the support portion of an anchor base member may be coupled to a support structure of a trolley-assist system via the anchor support member. The anchor support member may comprise a tension member or a compression member. The tension member may comprise a cable, a wire, or a rope. The compression member may comprise a rod or a strut. The reusable base system may comprise a plurality of anchor support members. The reusable base system may comprise at least two anchor support members. At least two anchor support members may be configured to couple to the support portion of the anchor base member at a first end and to a support structure of a trolley-assist system at the opposite, second end. In other words, the support portion of an anchor base member may be coupled to a support structure of a trolley-assist system via at least two anchor support members. The at least two anchor support members may comprise at least two tension members or at least two compression members. The reusable base may further comprise a reinforcing portion extending about or around at least a portion of the support portion. The reinforcing portion may be integral to the base member or anchor base member. The support portion may be integral to the reinforcing portion and vice versa. The reinforcing portion may allow the support portion to withstand higher forces, particularly as the support portion may extend upwardly from the base member or anchor base member. Further, this may provide a stronger and more robust support for the support structure when releasably coupled to the support portion. The base member or anchor base member may comprise three sections. The three sections may be identical sections. Alternatively, two of the sections may be identical. One of the sections may comprise the support portion. The base member or anchor base member comprising three sections may advantageously make it easy to assemble, dismantle and relocate the reusable base. As each section can be transported individually, this may further reduce the burden on the equipment used to transport the reusable base, because the weight will be reduced in comparison to transporting the whole reusable base. The base member or anchor base member may comprise a concrete material. The base member or anchor base member may be formed from a concrete material. The base member or anchor base member may comprise a pre-cast concrete material. The base member or anchor base member may be formed from a pre-cast concrete material. The base member or anchor base member may comprise a reinforced concrete material. The base member or anchor base member may be formed from a reinforced concrete material. The base member or anchor base member may comprise a reinforced pre-cast concrete material. The base member or anchor base member may be formed from a reinforced pre-cast concrete material. This provides a base member or anchor base member that has high compressive strength. Further, reinforced concrete material may be advantageously weather resistant. The support portion or base column may comprise a metal material. The support portion or base column may formed from a metal material. The reinforcing portion may comprise a concrete material. The reinforcing portion may be formed from a concrete material. The reinforcing portion may comprise a pre-cast concrete material. The reinforcing portion may be formed from a pre-cast concrete material. The reinforcing portion may comprise a reinforced concrete material. The reinforcing portion may be formed from a reinforced concrete material. The reinforcing portion may comprise a reinforced pre-cast concrete material. The reinforcing portion may be formed from a reinforced pre-cast concrete material. The base member or anchor base member may comprise a block of material. Each section of the base member or anchor base member may comprise a block of material. The material may be or comprise any of those described above. The maximum height of the reusable base may be at least 1 meter. The maximum height of the reusable base may be at least 2 meters. The maximum height of the reusable base may be at least 2.5 meters. Preferably, the maximum height of the reusable base may be at least 3 meters. The maximum height of the base member or anchor base member, or a section thereof, may be at least 0.5 meters. The maximum height of the base member or anchor base member, or a section thereof, may be at least 0.75 meters. The maximum height of the base member or anchor base member, or a section thereof, may be at least 1 meter. The maximum width of the base member or anchor base member, or a section thereof, may be at least 2 meters. The maximum width of the base member or anchor base member, or a section thereof, may be at least 3 meters. The maximum width of the base member or anchor base member, or a section thereof, may be at least 3.5 meters. The mass of the base member or anchor base member may be between about 10 tonnes and about 40 tonnes. Preferably, the mass of the base member or anchor base member may be between about 15 tonnes and about 35 tonnes. More preferably, the mass of the base member or anchor base member may be between about 20 tonnes and about 30 tonnes. The mass of the base member or anchor base member may be about 28 tonnes. The reusable base may comprise a lift connector for coupling to a lifting apparatus, such as a crane or a hoist. The lift connector may be configured to be engaged by a lifting apparatus. The lift connector may be configured to be engaged by the lifting hook or shackle of a lifting apparatus. The lift connector may be a lifting hook or lifting loop. The lift connector, lifting hook, or lifting loop may enable lifting equipment or apparatus to releasably couple to the reusable base in order for it to be lifted or hoisted into or out of position. The reusable base may comprise a plurality of lift connectors. Each section of the base member or anchor base member may comprise a lift connector. Each section of the base member or anchor base member may comprise at least two lift connectors. If the base member or anchor base member comprises three sections, the base member or anchor base member may comprise at least three lift connectors. The or each lift connector may be integral to the base member or anchor base member. The or each lift connector may be embedded within the base member or anchor base member. The or each lift connector may be embedded within the material of the base member or anchor base member, which may be a concrete material as described herein. The present disclosure also relates to a trolley-assist system for mining vehicles. The system may comprise a plurality of reusable bases according to the first aspect. The system may comprise a reusable base system according to the second aspect. The system may comprise a plurality of support structures configured to support an overhead power cable for providing electrical power to a mining vehicle. Each support structure may be mounted to a corresponding reusable base. Each support structure may be mounted directly to a corresponding reusable base. According to a third aspect of the present disclosure, there is provided a trolley-assist system for mining vehicles. The system comprises a plurality of reusable bases according to the first aspect. The system comprises a plurality of support structures configured to support an overhead power cable for providing electrical power to a mining vehicle. Each support structure is mounted to a corresponding reusable base. Advantageously, this provides a trolley-assist system that is portable and that is formed of modular parts. Advantageously, this means that parts of the trolley-assist system, or the trolley-assist system as whole, can be assembled, dismantled and relocated easily. As discussed above, this is advantageous as the terrain of the ground, support surface or mine, and the entry and access roads of the site, may change over time. The portability of the trolley-assist system is further advantageous because it reduces material waste and costs compared to the known prior art, whereby at least parts of the trolley-assist system are destroyed and then replaced with new parts if the location needs to be adjusted. The plurality of support structures may support an overhead power cable. The trolley-assist system may comprise an overhead power cable. The overhead power cable is electrically conductive. The overhead power cable is configured to provide power (electrical power) to a mining vehicle using the trolley-assist system. Each support structure being mounted to a corresponding reusable base ensures that the support structure is securely supported in a required position and orientation with respect to the support surface. Each support structure is preferably mounted directly to a corresponding reusable base. Each support structure is preferably releasably mounted directly to a corresponding reusable base. Each support structure may comprises a column. The column may be releasably couplable or mountable to a corresponding reusable base. The column may be releasably couplable or mountable to the support portion of a corresponding reusable base. The column may be releasably couplable or mountable directly to the support portion of a corresponding reusable base. The column may refer to a vertical or upright structure, such as an upright pillar, post or tube. The column extends from a first end to a second end. In use, the first end may be a lower end of the column and the second end may be an upper end of the column. The first end of column may be configured to be releasably couplable or mountable to the support portion of a reusable base. The first end of the column may be flanged so as to engage with the flange of the support portion or base column thereof. The plurality of support structures may comprise two end support structures and at least one intermediate support structure. The overhead power cable may extend between the two end support structures via the at least one intermediate support structure. The two end structures may respectively be located at the beginning and the end of the trolley-assist system. The length of the trolley line may be increased by increasing the number of intermediate support structures between the two end support structures. Each support structure may comprise a beam. The or each intermediate support structure may comprise a beam. The beam may be pivotably coupled to the column and configured to support the overhead power cable. The beam may be a cantilevered beam. The beam may extend from a first end to a second end. The first end of the beam may be a coupled end. The second end of the beam may be a free end. The beam may be coupled to the column. The beam may be releasably coupled to the column. The beam may be coupled to an upper portion or an upper or second end of the column. The beam may be pivotably coupled to an upper portion or an upper or second end of the column. The beam may advantageously provide support for the overhead power cable. The beam may support the overhead power cable. The beam may provide a support for the overhead power cable such that the overhead power cable is positioned substantially centrally with respect to a mining vehicle haul road or track. The length of the column may be at least about 10 meters. The length of the column may be at least about 11 meters. Preferably, the length of the column may be at least about 12 meters. The length of the beam may be at least about 10 meters. The length of the beam may be at least about 11 meters. Preferably, the length of the beam may be at least about 12 meters. A first end of the beam may be coupled to the column at a location proximate the second end of the column. The first end of the beam may be coupled to the column at a location proximate the second end of the column such that it is pivotable about an axis that is both orthogonal to a longitudinal axis of the column and orthogonal to a longitudinal axis of the beam. The beam may be arranged such that it is only pivotable, about the axis orthogonal to the longitudinal axis of the column and orthogonal to the longitudinal axis of the beam, from a steady-state position towards the second end of the column. In other words, in use, the beam may be only pivotable upwards, away from the support surface or ground. This may be advantageous because it provides a support structure with improved adjustability if the terrain of a mining vehicle haul road is uneven and / or changes over time. It may be common for the mining vehicle haul road to change over time. As a result, this can lead to uneven surfaces. When a mining vehicle travels over these uneven surfaces, it may bounce, leading to oscillations in the overhead cable that can apply an upward pressure on the beam. As the beam is pivotably coupled, this allows the beam to move upwardly in response to any upward forces applied by the mining vehicle. Consequently, this reduces the risk of damage to the beam and / or the support structure as a whole. Further advantageously, such a configuration may allow the beam to be more easily adjusted such that the desired levelling of the beam is achieved, particularly, in comparison to the known prior art, whereby the beam is fixed relative to the column. The beam being pivotable may also reduce installation times and costs. This is because the effort needed with regard to setting and aligning the beam with respect to the column may be reduced. The beam being pivotable also ensures that the necessary clearance is maintained between the beam and the overhead power cable. Further still, maintenance costs may be reduced because the beam is less likely to be misaligned or misplaced due to uneven surfaces or terrain. In the present disclosure, the second end of the column may refer to the upper or top end of the column, when in use. The first end of the column may refer to the lower or bottom end of the column, when in use. The steady-state position of the beam may refer to a resting position to which the position the beam returns after being deflected or pivoted relative to the column or after undergoing a pivoting movement. The beam may be coupled to the column via a first hinge joint. The first hinge joint advantageously enables relative movement between the beam and the column. The hinge joint may be configured such that, in use, the beam is pivotable in an upward direction. In the present disclosure, upward direction refers to a direction away from the support surface and towards the upper end of the column. The first hinge joint may be releasably securable to the column. The first hinge joint may be releasably securable to the beam. The beam may be pivotable about a longitudinal axis of the column. In other words, the beam may be pivotable from the steady-state position towards the second end of the column and also pivotable about the longitudinal axis of the column. The beam being able to also pivot about the longitudinal axis of the column, further ensures that the beam is able to better withstand forces applied to it and enable more favourable relative movement between the beam and the column. Consequently, this reduces the likely of damage of the beam and the support structure as a whole. The beam may be coupled to the column via a second hinge joint. The second hinge joint advantageously enable further relative movement between the beam and the column, such that the beam can pivot about the longitudinal axis of the column. The second hinge joint may be configured to restrict the movement of the beam about the longitudinal axis of the column. The second hinge joint may be configured to restrict angular movement of the beam about the longitudinal axis of the column. The second hinge joint may be configured to restrict angular movement of the beam about the longitudinal axis of the column to a maximum angle of 90 degrees. In other words, the second hinge joint may be configured such that the beam may not be able to pivot about the longitudinal axis of the column by an angle greater than 90 degrees. The second hinge joint may be configured to restrict angular movement of the beam about the longitudinal axis of the column to a maximum angle of 60 degrees. The second hinge joint may be configured to restrict angular movement of the beam about the longitudinal axis of the column to a maximum angle of 45 degrees. This may prevent excessive relative motion of the beam with respect to the column in order to minimise any damage and reduce any resulting excessive misalignment of the overhead power cable over the mining vehicle haul road or track. The second hinge joint may be releasably securable to the column. The second hinge joint may be releasably securable to the beam. The first hinge joint and the second hinge joint may be formed as a biaxial hinge joint. The beam may be coupled to the column via a biaxial hinge joint. The biaxial hinge joint permits pivoting or angular movement of the beam about two axes. The biaxial hinge joint may prevent rotation of the beam. The biaxial hinge joint may be releasably securable to the column and / or the beam. The biaxial hinge joint may be adjusted easily to level the beam compared to the known prior art, whereby the beam is fixed relative to the column. As such, the biaxial hinge joint may reduce installation times and costs. In a steady-state position, the beam may be substantially orthogonal to the column. In other words, the beam and the column may be substantially perpendicular to each other. The beam may be pivotable such that it only moves from a steady-state position towards the second end of the column and back to the steady-state position. In other words, the beam may be coupled such that it does not pivot or move from the steady-state position towards the first end of the column. Advantageously, this ensures that any necessary clearance or distance between the beam and the overhead power cable is maintained. The trolley-assist system may further comprise support means configured to support the beam when in the steady-state position. The support means may advantageously assist in ensuring the beam does not pivot or move from the steady-state position towards the first end of the column. In other words, the support means may restrict movement of the beam in a particular direction. The support means may be configured to be in tension when the beam is in the steady-state position. This may ensure that the beam always returns to the steady-state position as a resting position. The support means may further comprise at least one tensioning cable. The at least one tensioning cable may be configured to further support the beam, which may be cantilevered. The support means may comprise at least one tensioning strut. A first end of the support means may be coupled adjacent the second end of the column and a second end of the support means may be coupled proximate the second end of the beam. The support means being coupled in this manner, in particular, to the second end of the beam minimises the tension required to prevent the beam for pivoting below the steady-state position. Where the support means comprises more than one tensioning cable, the first end of each tensioning cable may be coupled adjacent the second end of the column. Each tensioning cable may be coupled at their first ends to the same location adjacent the second end of the column. The second end of each tensioning cable may be coupled to a corresponding location on the beam. In other words, the second end of each tensioning cable may be coupled to a different point of the beam. The or each tensioning cable may be coupled at a first end to the column and at a second end to the beam. The tensioning cable may advantageously ensure the beam does not pivot about the column such that the angle between the second end portion (or top or upper portion above the beam) of the column and the upper surface of the beam exceeds a pre-determined angle. For example, such a pre-determined angle may be about 90 degrees. This may also ensure that the necessary clearance between the beam and the overhead power cable is maintained. In other words, the tensioning cable may ensure that the beam does not bend or deflect downwards, away from the second, top end of the column and towards the mining haul road. The support means may be configured, or further configured, to be in compression when the beam is in the steady-state position. The support means may comprise at least one compression member. The compression member may be coupled at a first end to a portion of the column below the beam. The compression member may be coupled at a second end to the beam. The compression member may comprise at least one compression strut. The compression member may comprise at least one hydraulic compression member. The support means may comprise at least one tension strut or cable and at least one compression member, such as a compression strut or a hydraulic compression member. The support structure may further comprise a mount configured to releasably couple the beam to the column. The beam may be hingedly or pivotably coupled to the mount. The beam may be hingedly or pivotably coupled to the mount such that the beam is pivotable about the axis orthogonal to the longitudinal axis of the column and orthogonal to the longitudinal axis of the beam. The beam may also be hingedly or pivotably coupled to the mount such that the beam is pivotable about the longitudinal axis of the column. The mount may be releasably coupled to the column. The mount may be configured to be slidable along the column. The mount may comprise a clamp assembly for coupling to the column. This advantageously provides a modular support structure, whereby the parts of the support structure can be moved or adjusted independently. This also allows the positioning of the beam with respect to length of the column to be adjusted easily if needed. The mount may support the hinge joint. The mount may support the biaxial hinge joint. The mount may be configured to releasably couple the beam to the column via the hinge joint. The support structure may comprise a bracket coupled to the mount. The bracket may be hingedly or pivotably coupled to the mount. The beam may be coupled to the bracket. The beam may be hingedly or pivotably coupled to the bracket. The beam may be coupled to the mount via the bracket. The bracket may be hingedly or pivotably coupled to the mount such that the bracket is pivotable about the longitudinal axis of the column. The beam may be hingedly or pivotably coupled to the bracket. The beam may be hingedly or pivotably coupled to the bracket such that the beam is pivotable about the axis orthogonal to the longitudinal axis of the column and orthogonal to the longitudinal axis of the beam or bracket. The longitudinal axis of the bracket may coincide with or be parallel to the longitudinal axis of the beam. The mount may be configured to restrict the pivotable or angular movement of the beam relative to the column. The mount may be configured to restrict the pivotable or angular movement of the beam relative to the column to no more than about 90 degrees. The mount may be configured to restrict the pivotable or angular movement of the beam relative to the column to no more than about 60 degrees. The mount may be configured to restrict the pivotable or angular movement of the beam relative to the column to no more than about 45 degrees. The mount may be configured to restrict the pivotable or angular movement of the bracket relative to the column to no more than about 90 degrees. The mount may be configured to restrict the pivotable or angular movement of the bracket relative to the column to no more than about 60 degrees. The mount may be configured to restrict the pivotable or angular movement of the beam bracket to the column to no more than about 45 degrees. The mount may comprise restricting elements that are configured to restrict the pivotable or angular movement of the bracket or beam relative to the column. The beam or bracket may be located between the restricting elements. The restricting elements may be located on either side of the bracket or beam, and may be configured to obstruct the bracket or beam from pivoting further in each direction. Each restricting element may comprise a pin. The trolley-assist system may further comprises an insulating earth wire. The insulating earth wire provides a low resistance path to the ground. Advantageously, in the event of a fault, the live current passing through the system will follow this path to the ground. The wire may be coupled at a first end to the support portion. The insulated earthing wire may be coupled at a second end to the column. At least one of the reusable bases may be a reusable base system according to the second aspect. The trolley-assist system may comprise a reusable base system according to the second aspect. The trolley-assist system may comprise at least one reusable base system according to the second aspect. One of the reusable bases of the trolley-assist system may be a reusable base of the reusable base system. In other words, one of the reusable bases of the reusable base system may be a reusable base of the trolley-assist system. By providing a reusable base system according to the second aspect, at least one of the support structures may be further supported by an anchor base member. This may advantageously provide a structurally resilient trolley-assist system, with the advantages associated with the reusable base system described herein. The trolley-assist system further may comprise an anchor support member. The anchor support member may be configured to couple to the support portion of an anchor base member at a first end and to a support structure at a second, opposite end. In other words, the support portion of an anchor base member may be coupled to a support structure via the anchor support member. As described herein, the anchor support member may be one of a compression member and a tension member. The anchor support member may be one of a compression member and a tension member of a reusable base system. The tension member may comprise a cable, a wire, or a rope. The compression member may comprise a rod or a strut. Advantageously, a compression member may provide the support structure with additional support against forces applied that push the support structure outwardly, away from the mining vehicle haul road or track. Advantageously, a tension member may provide the support structure with additional support against forces applied that pull the support structure inwardly, towards the mining vehicle haul road or track. These forces may be applied by a mining vehicle during use of the trolley-assist system. Particularly, these forces may be applied by the mining vehicle, when the mining vehicle haul road or track is not linear or straight or in the presence of uneven surfaces on the mining vehicle haul road or track. The trolley-assist system may comprise a plurality of anchor support members. The trolleyassist system may comprise at least two anchor support members. Each of the at least two anchor support members may be configured to couple to the support portion of the anchor base member at a first end and to a support structure of a trolley-assist system at the opposite, second end. In other words, the support portion of an anchor base member may be coupled to a support structure of a trolley-assist system via at least two anchor support members. The at least two anchor support members may comprise at least two tension members or at least two compression members. Each end support structure may be supported by a reusable base system of the second aspect. As such, each end support structure may be further supported by an anchor base member. Each end support structure may be coupled to a corresponding anchor base member by a tension member, as described herein. The trolley-assist system may comprise at least two reusable base systems according to the second aspect such that each end support structure may be supported by a corresponding reusable base system according to the second aspect. At least one intermediate support structure may be supported by a reusable base system of the second aspect. As such, the or each intermediate support structure may be further supported by an anchor base member. The or each intermediate support structure may be coupled to a corresponding anchor base member by a tension member or a compression member, as described herein. The trolley-assist system may comprise at least one reusable base system according to the second aspect such that at least one intermediate support structure may be supported by a corresponding reusable base system according to the second aspect. Where each end support structure is further supported by an anchor base member, then the trolley-assist system may comprise at least three reusable base systems according to the second aspect such that at least one intermediate support structure and the end support structures may each be supported by a corresponding reusable base system according to the second aspect. The trolley-assist system may further comprise a catenary, support, or messenger cable configured to be supported by the plurality of support structures. The support cable may extend between the two end support structures via the at least one intermediate support structure. The support cable may be configured to be supported by the beams of the plurality of the support structures. The support cable may be configured to support the overhead power cable. The overhead power cable may be suspended from the support cable. The overhead power cable may be supported below the support cable. The support cable may be configured to support the overhead power cable via dropper cables. The trolley-assist system may further comprise a tensioning system configured to adjust the tension in the catenary or support cable. The tensioning system may comprise a pulley coupled to a support structure, preferably coupled to one of the end support structures, and tensioning weights coupled to an end of the catenary or support cable. The trolley-assist system may comprise at least one power distribution unit configured to receive electrical power from a source of electrical energy and provide electrical power to the overhead power cable. The present disclosure also relates to a method of assembly of a trolley-assist system according to the third aspect. The method may comprise positioning the plurality of reusable bases adjacent to a mining vehicle haul road. The method may comprise attaching each support structure of the plurality of support structures to a corresponding reusable base. The method may comprise mounting, to each of the plurality of support structures, an overhead power cable for providing electrical power to a mining vehicle, such that the overhead power cable may extend between the plurality of support structures. According to a fourth aspect of the present disclosure, there is provided a method of assembly of a trolley-assist system according to the third aspect. The method comprises positioning the plurality of reusable bases adjacent to a mining vehicle haul road. The method comprises attaching each support structure of the plurality of support structures to a corresponding reusable base. The method further comprises mounting, to each of the plurality of support structures, an overhead power cable for providing electrical power to a mining vehicle, such that the overhead power cable extends between the plurality of support structures. The method according to the fourth aspect provides a portable trolley-assist system in accordance with the third aspect, the advantages of which have been discussed in the present disclosure. Before positioning the plurality of reusable bases adjacent to a mining vehicle haul road, where the base members of each reusable base comprises a plurality of sections, the method of assembly may comprise securely coupling or connecting the plurality of sections together so as to form each reusable base. The method may further comprise positioning a first set of the plurality of reusable bases to conform to a substantially linear section of the mining vehicle haul road. The reusable bases of the first set may be spaced apart by a first distance. In other words, the first set of the plurality of reusable bases may be positioned in a substantially straight or linear line adjacent to a substantially straight or linear section of the mining vehicle haul road. As a result, the first set of the plurality of reusable bases may form a straight section of the trolley-assist system. The first distance may be between about 30 metres (m) and about 50 m. The first distance may be between about 35 m and 45 m. The first distance may be between about 38 m and 42 m. The first distance may be about 40 m. The method may further comprise positioning a second set of the plurality of reusable bases to conform to a curved section of the mining vehicle haul road. In other words, the second set of the plurality of reusable bases may be positioned adjacent to a curved section of the mining vehicle haul road, such that they follow such a curved section of the road. As a result, the second set of the plurality of reusable bases may form a curved section of the trolley-assist system. The reusable bases of the second set may be spaced apart by a second distance. The curved section may have a radius greater than 400 m. The second distance may be between about 15 m and about 35 m. The second distance may be between about 20 m and 30 m. The second distance may be about 25 m. The first distance may be greater than the second distance. This may be advantageous because a curved section of the mining vehicle haul road requires an increased number of reusable bases, in comparison to a substantially straight section. The method may further comprise positioning a plurality of first sets of the plurality of reusable bases, and a plurality of second sets of the plurality of reusable bases. At least one of the plurality of reusable bases of the first set of the plurality of reusable bases may also be in the second set of the plurality of reusable bases. The method may comprise positioning at least one anchor base adjacent to a mining vehicle haul road. The method may comprise positioning at least one anchor base adjacent to a reusable base. The method may comprise positioning a plurality of anchor bases adjacent to a mining vehicle haul road. Each one of the plurality of anchor bases may be positioned adjacent to a corresponding reusable base. The anchor base may be in accordance with the present disclosure. At least one of the plurality of reusable bases of the, or each, first set may comprise at least one reusable base system according to the second aspect. At least one of the plurality of reusable bases of the, or each, first set may be a reusable base of a reusable base system. In other words, one of the reusable bases of a reusable base system may be one of the plurality of reusable bases of the, or each, first set. At least one of the plurality of reusable bases of the, or each, second set may comprise at least one reusable base system according to the second aspect. At least one of the plurality of reusable bases of the, or each, second set may be a reusable base of a reusable base system. In other words, one of the reusable bases of a reusable base system may be one of the plurality of reusable bases of the, or each, second set. By providing a reusable base system according to the second aspect, at least one of the support structures may be further supported by an anchor base member. This may advantageously provide a structurally resilient trolley-assist system, with the advantages associated with the reusable base system described herein. The method may further comprise coupling the or each anchor base to a corresponding support structure via an anchor support member. The method may comprise coupling the or each anchor base to a corresponding support structure via a compression member when said support structure is interior to the curved section of the mining vehicle haul road. In other words, when the mining vehicle haul road curves around the support structure, the coupling member is a compression member. This advantageously provides a compressive force to the support structure. This may further support the support structure against forces applied to the support structure by the mining vehicles. The method may further comprises coupling the or each anchor base to the corresponding support structure via a tension member when said support structure is exterior to the curved section of the mining vehicle haul road. In other words, when the mining vehicle haul road curves away from the support structure, the coupling is a tension member. This advantageously provides a tensile force to the support structure. This may further support the support structure against forces applied to the support structure by the mining vehicles. The method may further comprise positioning the two end support structures at the ends of the trolley-assist system. Each end support structure may be supported by a reusable base system. The anchor bases of each reusable base system may positioned substantially in line with the overhead power cable. The method may further comprise coupling each anchor base to the corresponding end support structure via a tension member. The present disclosure also relates to a mining hauling system. The mining hauling system may comprise a trolley-assist system according to the third aspect and at least one mining vehicle. According to a fifth aspect of the present disclosure, there is provided a mining hauling system. The mining hauling system comprises a trolley-assist system according to the third aspect of the present disclosure and at least one mining vehicle. The mining vehicle may comprise a mining haul truck. The mining haul truck may be configured to draw power from the trolley-assist system, in particular the overhead power cable. The mining vehicle may comprise a power drawing element for drawing electrical power from the overhead power line of the trolley-assist system. The power drawing element may comprise a current collector. The power drawing element may comprise a pantograph. The payload or hauling capacity of the mining vehicle may be at least 50 tonnes. The payload or hauling capacity of the mining vehicle may be at least 100 tonnes. The mining vehicle may be a hybrid vehicle. The mining vehicle may comprise a hybrid powertrain. The mining vehicle may comprise a diesel-electric powertrain. It will be appreciated that features described in relation to one aspect of the present disclosure may also be applied equally to all of the other aspects of the present disclosure. Features described in relation to the first aspect of the present disclosure may be applied equally to the second aspect of the present disclosure and vice versa. Features of the reusable base described in relation to the first aspect may be applied, mutatis mutandis, to the trolley-assist system of the third aspect. It will further be appreciated that particular combinations of the various features described and defined in any aspects of the invention may be implemented and / or supplied and / or used independently. Description of Specific Embodiments of the Disclosure Specific embodiments of the disclosure will now be described with reference to the figures, in which: Figure 1 shows a top view of a reusable base according to the present disclosure; Figure 2 shows a cross section of the reusable base; Figure 3a shows a side view of a support structure of the trolley-assist system coupled to a reusable base; Figure 3b shows the side view of Figure 3a with a mining vehicle being powered by the trolleyassist system; Figure 4 shows a magnified view of the hinge joint; Figure 5 shows a perspective view of an anchor base; Figure 6 shows a side view of a trolley-assist system comprising a plurality of reusable bases and support structures; Figure 7 shows a side view of an intermediate support structure of the trolley-assist system coupled to a reusable base system; Figure 8 shows a side view of an alternative intermediate support structure of the trolley-assist system coupled to a reusable base system; Figure 9 shows a side view of an end support structure of the trolley-assist system coupled to a reusable base system; Figure 10 shows a perspective view of the end support structure of Figure 9; Figure 11 shows a flow diagram of a method according to the present disclosure; Figure 12 shows a further flow diagram of a method according to the present disclosure; Figure 13 shows a further flow diagram of a method according to the present disclosure; and Figure 14 shows a further flow diagram of a method according to the present disclosure. Specific description Figure 1 shows an embodiment of a reusable base 100 comprising a reusable base member 102. The reusable base member 102 is free-standing with respect to a support surface. The support surface may be a mining vehicle haul road. The reusable base member 102 of the reusable base 100 comprises three sections 102a, 102b, 102c. Each of the three sections 102a, 102b, 102c are from pre-cast concrete material. The sections 102a, 102b, 102c can be assembled together to form the base member 102. Each of the three sections 102a, 102b, 102c comprise four lifting hooks 104. However, an alternative number of lifting hooks may be provided. The lifting hooks 104 allow each section 102a, 102b, 102c or the assembled reusable base 100 or base member 102 to be picked up, by a crane for example, and positioned in the desired location. Each of the three sections 102a, 102b, 102c is rectangular in shape. Although not shown, the three sections are coupled to one another via connecting means. This ensures the three sections are secured to one another and as such provide a support for a support structure. In this example embodiment, the connecting means are tie bolts. However, alternative connecting means will be appreciated by the skilled person. The reusable base 100 comprises a support portion 106. One section of the three sections 102a, 102b, 102c comprises the support portion 106. As shown in Figure 1, the middle section 102b of the three sections 102a, 102b, 102c comprises the support portion 106. The support portion 106 is offset from the central axis of the base member 102. The support portion 106 is of a metal material, for example, steel. A second or an upper end of the support portion 106 comprises a flange 108. The flange 108 is configured to releasably couple the second end of the support portion 106 to a support structure. In particular, the flange 108 is configured to releasably couple the second end of the support portion 106 to a flange on a first end of the support structure. The flange 108 of the support portion 106 and the flange of the support structure comprise a plurality of holes, for coupling the respective flanges to one another via bolts and nuts. As shown more clearly in Figure 2, the support portion 106 comprises a column. The support portion 106 protrudes from the upper surface of the base member 102, particularly the middle section 102b of the base member 102. The base member 102, particularly the middle section 102b of the base member 102, comprises a recess for receiving a first end of the support portion 106, as shown in broken lines. The base member 106 further comprises a reinforcing portion 210. The reinforcing portion 210 extends around a portion of the support portion 106, as shown. The reinforcing portion 210 is integral to the base member 120b. The reinforcing portion 210 extends from the upper surface of the base member 102b. The reusable base member 102, including the reinforcing portion 210, is made of reinforced concrete material. As shown in Figure 2, the reusable base member 102 comprises steel rebar. The steel rebar is embedded in the concrete such that the concrete and the steel rebar act together in resisting forces. The reusable base member 102 has a mass of around 28 tonnes. Figure 3 shows a trolley-assist system 300. The trolley-assist system 300 comprises the reusable base 100 as shown in Figures 1 and 2. The trolley-assist system 300 further comprises a support structure 302. The support structure 302 comprises a column 304. The column 304 comprises a flange 306 at a first end. The flange 306 is configured to couple with the flange 108 at the second end of the support portion 106. This flange assembly 108, 306 provides a secure and robust connection between the support portion 106 and the column 304. While still providing a modular assembly, the support structure 302, and in particular, the column 304 can be de-coupled or released from the support portion 106 if relocation of the system is required. The column 304 and the support portion 106 conform to each other with regard to diameter. The trolley-assist system 300 comprises an insulated earthing wire 308. The insulated earthing wire 308 is coupled at a first end to the support portion 106. The insulated earthing wire 308 is coupled at a second end to the column 304. The trolley-assist system 300 comprises a beam 310. The beam 310 has a first end and a second end. The first end is coupled to the column 304 proximate the second end of the column 304. The first end of the beam 310 is coupled to the column 304 via a hinge joint 312, shown in more detail in Figure 4, such that the beam 310 is pivotable about an axis orthogonal to a longitudinal axis of the column 304 and orthogonal to a longitudinal axis of the beam 310. The beam 310 is arranged such that it is only pivotable, about the axis orthogonal to the longitudinal axis of the column 304 and orthogonal to the longitudinal axis of the beam 310, from a steady-state position towards the second end of the column 304. The beam 310, as shown in Figure 3, is in the steady-state position. As such, in use, the beam 310 is pivotable from the steady-state position towards the second end of the column 304. In other words, the beam 310 can pivot in a direction such that the angle between the beam 310 and the portion of the column 304 above the hinge joint 312 decreases. This allows the support structure 302 as a whole to better withstand forces applied to it from a mining vehicle and / or the overhead power cable oscillating or bouncing, for example. The beam 310 returns to the steady-state position when no upward force is applied. The trolley-assist system 300, as shown in Figure 3, has two tensioning cables 314a, 314b. Each tensioning cable 314a, 314b is coupled at a first end to the beam 310. In particular, each tensioning cable 314a, 314b is coupled to a bracket 326 . The bracket 326 is coupled to a portion of the beam 310. Further, each tensioning cable 314a, 314b is coupled at a second end to an upper portion of the column 304. The upper portion of the column 304 comprises a bracket 324. The second end of each of the two tensioning cables 314a, 314b are coupled or clamped to the bracket 324, such that they are secured to the column 304. A mining hauling system comprises the trolley-assist system 300 and at least one mining vehicle 316. As shown in Figure 3b, a mining vehicle 316 can be powered by the trolley assist system via a pantograph 318. The pantograph 318 is mounted on the roof of the vehicle 316 to collect power. The pantograph 318 makes contact with the overhead power cable (not shown, but shown in Figure 6). The pantograph may use friction to collect electricity from the overhead power cable. The overhead power cable is coupled to the beam 310 via a plurality of droppers 320. The overhead power cable (not shown, but shown in Figure 6) feeds electricity to the vehicle 316 via the pantograph 318, thereby powering the mining vehicle 316. A support cable is coupled to the beam 310 via a plurality of support elements 322. Although not shown, the support cable provides support to the overhead power cable (see Figure 6). The overhead power cable is suspended from the support cable. As shown in Figure 4, the beam 310 is coupled to the column 304 via the hinge joint 312. The hinge joint is a biaxial hinge joint 312. The biaxial hinge joint 312 allows the beam 310 to pivot about the axis orthogonal to the longitudinal axis of the column 304 and orthogonal to the longitudinal axis of the beam 310. The biaxial hinge joint 312 may allow the beam 310 to pivot an angle of about 45 degrees. The biaxial hinge joint 312 also allows the beam 310 to pivot about the longitudinal axis of the column 304. The biaxial hinge joint 312 allows the beam 310 to pivot about the longitudinal axis of the column 304 by about 30 degrees. The hinge joint 312 is secured to the column 304 via a bracket 416. The bracket 416 is releasably coupled to the column 304 via a plurality of threaded rods 418 and washers. The biaxial hinge joint 312 is releasably coupled to the bracket 416 via a connecting means, such as a pin 420. The first end of the beam 310 is releasably coupled to the hinge joint 312 via a connecting means, such as a further pin 422. There is also provided a reusable base system for the trolley-assist system 300 for mining vehicles 316, as shown in Figure 8. The reusable base system comprises a reusable base 100, as shown in detail in Figures 1 and 2. The system further comprises an anchor base 500 as shown in detail in Figure 5. The anchor base 500 comprises an anchor base member 502. The anchor base 500 comprises an anchor support portion 506. The anchor support portion 506 is integral to the anchor base member 502. The anchor base member 502 is free-standing with respect to the support surface, such as the ground. Although not shown, the anchor base member 502 comprises three sections, similar to base member 102 shown in Figures 1 and 2. The three sections are releasably coupled to one another via tie bolts. However, alternative connecting means will be appreciated by the skilled person. One section of the three sections comprises the anchor support portion 506. In the embodiment of Figure 5, this is the middle section. The anchor support portion 506 is offset from the central axis of the anchor base member 502. The support portion 506 is of a metal material, for example, steel. A second or an upper end of the anchor support portion 506 comprises a flange 508. An anchorage plate 510 is releasably coupled to the flange 508 via a connecting means 512. The connecting means 512 are a plurality of bolts and nuts. The anchorage plate 510 comprises a bracket 514. The bracket 514 is configured to secure a compression member or a tension member, such that said member can be coupled at a second end to the support structure 302 of a trolley-assist system being supported by the reusable base 100. As shown in Figure 5, the anchor base member 502 comprises a plurality of lifting hooks 504. The lifting hooks 504 provide an attachment point for lifting the anchor base 500. As shown in Figure 6, the trolley-assist system 300 may comprise a plurality of reusable bases 100. The system further comprises a plurality of support structures 302. The plurality of support structures 302 are each releasably coupled and / or mounted to a corresponding support portion 106 of a reusable base 100. In particular, the system 300 comprises two end support structures 900, shown in more detail in Figures 9 and 10. The system also comprises at least one intermediate support structure 700, 800, shown in more detail in Figures 7 and 8. The overhead power cable 601, which provides electric power to the mining vehicle 316, extends from the first end support structure 900 to the second end support structure 900 via the at least one intermediate support structure 700, 800. The support cable 603, which supports the overhead power cable 601, extends from the first end support structure 900 to the second end support structure 900 via the at least on intermediate support structure 700, 800. The support cable 603 is configured to support the overhead power cable 601. The overhead power cable 601 is below the support cable 603. The overhead power cable 601 is suspended from the support cable 603 via dropper cables 607. Figure 7 shows an intermediate support structure 700 of the trolley-assist system 300. The intermediate support structure 700 is supported by the anchor base 500 of Figure 5. Figure 7 shows the anchor base support portion 506 coupled to the column 304 via a tension member 702. The tension member 702 provides a tensile force to the column 304. The tension member 702 is coupled at a first end to the bracket 514 on the anchorage plate 510. The tension member 702 is coupled at a second end to the column 304 via a fixture, such as bracket 704. In this example embodiment, the tension member 702 is a tensioning cable. Figure 8 illustrates the intermediate support structure 800 of the trolley-assist system 300. The intermediate support structure 800 of Figure 8 is the same as that illustrated in Figure 8. However, instead of a tension member 702, the anchor base support portion 506 is coupled to the column 304 via a compression member 802. The compression member 802 provides a compressive force to the column 304. The compression member 802 is coupled at a first end to the bracket 514 on the anchorage plate 510. The compression member 802 is coupled at a second end to the column 304 via a fixture, such as a bracket 704. In this example embodiment, the compression member 802 is a compression tube. Figure 9 illustrates an end support structure 900 of the trolley-assist system. The end support structure 900 is supported by a reusable base 100. The anchor base 500 is position substantially in line with the overhead power cable, as shown more clearly in Figure 9. The anchor base 500 is coupled to the end support structure 900 via a tension member 902. The tension member 902 provides a tensile force to the column 304. The tension member 902 is coupled at a first end to the bracket 514 on the anchorage plate 510. The tension member 902 is coupled at a second end to the column 304 via a fixture, such as a bracket 604. The tension member 902 of the example embodiment comprises two tension cables 902a, 902b. As shown in Figure 9, there is also an earth wire 906 coupled at a first end to the bracket 514 on the anchorage plate and at a second end to the column 304, via a fixture. Figure 10 further illustrates an end support structure 900 of the trolley-assist system. The trolley-assist system of the example further comprises the support cable 1002 and the overhead power cable 1004. The support cable 1002 supports the overhead power cable 904. The support cable 1002 supports the overhead power cable 1004 via hangers and / or droppers, not shown in Figure 10. The droppers may be current-carrying droppers. Further, the support cable 1002 advantageously provides more electrical conductivity. The support cable 1002 and the overhead power cable 1004 are each kept in mechanical tension, at each end support structure 900 by a tension wheel pulley arrangement 1006 comprising weights 1008 as shown in Figure 10. Alternative mechanisms for keeping the wires in tension, such as hydraulic tensioners, will be appreciated by the skilled person. Figure 11 illustrates an example method of assembly of the trolley-assist system embodying the present disclosure. The method 1100 comprises the following steps. Step 1102 comprises positioning the plurality of reusable bases 100 adjacent a mining vehicle haul road. Each reusable base 100 may be positioned using the lifting hooks 104 and a lifting device, such as a crane. The method further comprises step 1104. Step 1104 is attaching each support structure 302 of the plurality of support structures to a corresponding reusable base 100. Attaching each support structure 302 of the plurality of support structure to the support portion 106 of a corresponding reusable base 100. This comprises coupling the flange 306 of the support structure 302 to the flange 108 of the support portion 108 using a plurality of bolts and nuts. The method further comprises step 1106. Step 1106 comprises mounting, to each of the plurality of support structures, the overhead power cable 1004 for providing electrical power to a mining vehicle, such that the overhead power cable 1004 extends between the plurality of support structures. The method may also comprise mounting to each of the plurality of support structures, the support cable 1002 to support the overhead power cable 1004, such that the support cable 1002 extends between the plurality of support structures. Figure 12 illustrates a further example method 1200 of assembly of the trolley-assist system. Some of the steps of method 1200 are identical to method 1100, in particular steps 1102,1104 and 1106 which are identical to steps 1202, 1204 and 1206. However, the method step of 1202 further comprises step 1202a positioning a first set of the plurality of reusable bases 100 to conform to a substantially linear section of the mining vehicle haul road. The reusable bases 100 of this first set are spaced apart by a distance between about 38 m and about 42 m. Further, the method step 1202 comprises a further step of positioning 1202b a second set of the plurality of reusable bases 100 to conform to a curved section of the mining vehicle haul road. In other words, the second set of the plurality of reusable bases 100 are positioned such that they follow and are adjacent to the path of the mining vehicle haul road. The reusable bases 100 of the second set are spaced apart by about 25 m. The distance between the first set of reusable bases i.e., the first distance, is greater than the distance between the second set of reusable bases i.e., the second distance. Depending on the configuration of the mining vehicle haul road, the method may comprise positioning a plurality of first sets of the plurality of reusable bases 100, and a plurality of second sets of the plurality of reusable bases 100. In practice, at least one of the plurality of reusable bases 100 of the first set may also be in the second set. The number of first sets and second sets is dependent on the length of the mining vehicle haul road and also whether the road is substantially linear or has curved sections. At least one of the plurality of reusable bases 100 of the, or each, second set comprises at least one reusable base system. In other words, at least one reusable base on the curved section of the road comprises both a reusable base 100 and an anchor base 500. The reusable base 100 is position adjacent the road. The anchor base 500 is positioned away from the road. Figure 13 illustrates a further example method 1300 of assembly of the trolley-assist system embodying the present disclosure. Some of the steps of method 1300 are identical to method 1200, in particular steps 1302 (1302a and 1302b), 1304 and 1306 which are identical to steps 1202 (1202a and 1202b), 1204 and 1206. The method 1300, further comprises step 1305 of coupling the or each anchor base 500 to the corresponding support structure. Whether the anchor base 500 is coupled to the support structure via a compression member 802 or a tension member 902 is dependent on the position of the support structure with respect to the mining vehicle haul road. The anchor base 500 is coupled to the corresponding support structure via a compression member 802 when the support structure is interior to the curved section of the mining vehicle haul road. In other words, when an intermediate support structure 800, mounted to a reusable base 100 of the second set, is positioned interior to a curved section of the mining vehicle haul road, the anchor base 500 is coupled to the column 304 of the intermediate support structure 800 via a compression member 802, for example a compression tube. The anchor base 500 is coupled to the corresponding support structure via a tension member 702 when the support structure is exterior to the curved section of the mining vehicle haul road. In other words, when an intermediate support structure 700, mounted to a reusable base 100 of the second set, is positioned exterior to a curved section of the mining vehicle haul road, the anchor base 500 is coupled to the column 304 of the intermediate support structure 700 via a tension member 702, for example a tensioning cable or rope. At least one of the plurality of reusable bases of the, or each, first set may comprise at least one reusable base system. In other words, at least one reusable base 100 on the substantially linear section of the road comprises both a reusable base 100 and an anchor base 500. The reusable base 100 is position adjacent the substantially linear section of the road. The anchor base 500 is positioned away from the road. The method further comprises, coupling 1405 the or each anchor base 500 to the corresponding support structure. The anchor base 500 may be coupled to the corresponding support structure via a compression member 802 or a tension member 702. Figure 14 illustrates a further example method 1400 of assembly of the trolley-assist system. 5 Some of the steps of method 1400 are identical to method 1300, in particular steps 1402 (1402a and 1402b), 1404, 1405 and 1406 are respectively identical to steps 1302 (1302a and 1302b), 1304,1305 and 1306. The method further comprises step 1408. Step 1408 comprises positioning two end support structures 900 at the respective ends of the trolley-assist system. In other words, at the respect ends of the mining vehicle haul road. Each end structure is 10 supported by a reusable base system as shown in Figures 9 and 10. The method comprises positioning the respective anchor bases substantially in line with the overhead power cable. Further, coupling each anchor base to the corresponding or respective end support structure via a tension member. Method step 1406 comprises mounting, to each of the plurality of support structures, the overhead power cable 1004 for providing electrical power to a mining 15 vehicle, such that the overhead power cable 1004 extends between the two end support structures 900 via the intermediate support structures 700, 800.

Claims

1. A reusable base for a trolley-assist system for mining vehicles, wherein the base comprises:a base member; anda support portion, integral to the base member, and coupleable to a support structure of a trolley-assist system and wherein, in use, the base is free-standing with respect to a support surface.

2. A reusable base according to claim 1, wherein the base member comprises at least two sections.

3. A reusable base according to claim 2, wherein the at least two sections are releasably securable to one another.

4. A reusable base according to claim 2 or 3, wherein the at least two sections are configured to interlock.

5. A reusable base according to any preceding claim, wherein the support portion is offset from a central axis of the base member.

6. A reusable base according to any preceding claim, wherein the support portion protrudes from an upper surface of the base member.

7. A reusable base according to claim 6, wherein the support portion is configured to be releasably coupled to a support structure of a trolley-assist system.

8. A reusable base according to claim 7, wherein the support portion comprises a flange configured to be releasably coupled to a support structure of a trolley-assist system.

9. A reusable base according to claim 6, 7 or 8, wherein the base member further comprises a reinforcing portion extending about at least a portion of said support portion, the reinforcing portion being integral to the base member.

10. A reusable base according to any preceding claim, wherein the base member comprises three sections.

11. A reusable base according to any preceding claim, wherein the base member is formed from a reinforced concrete material, and the support portion is formed from a metal material.

12. A reusable base according to any preceding claim, wherein the mass of the base member is between about 10 tonnes and about 40 tonnes, preferably about 28 tonnes.

13. A reusable base system for a trolley-assist system for mining vehicles, comprising: a reusable base according to any of the preceding claims; and an anchor base comprising: an anchor base member; andan anchor support portion, integral to the anchor base member, configured to be coupled to a support structure of a trolley assist system being supported by the reusable base, wherein, in use, the anchor base is free-standing with respect to a support surface.

14. A reusable base member system according to claim 13, wherein the at least one anchor base member comprises at least two sections.

15. A trolley-assist system for mining vehicles comprising:a plurality of reusable bases according to any of claims 1 to 12; anda plurality of support structures configured to support an overhead power cable for providing electrical power to a mining vehicle, wherein, each support structure is mounted to a corresponding reusable base.

16. A trolley-assist system according to claim 15, wherein each support structure comprises a column, the column being releasably couplable to the support portion of the corresponding reusable base.

17. A trolley-assist system according to claim 16, wherein the plurality of support structures comprises two end support structures and at least one intermediate support structure, wherein the overhead power cable extends between the two end support structures via the at least one intermediate support structure.

18. A trolley-assist system according to claim 17, wherein the or each intermediate support structure comprises a beam, the beam being pivotably coupled to the column and configured to support the overhead power cable.

19. A trolley-assist system according to claim 18, further comprising at least one tensioning cable configured to support the beam, wherein the or each tensioning cable is coupled at a first end to the column and at a second end to the beam.

20. A trolley-assist system according to any of claims 15 to 19, comprising a reusable base system according to claim 13 or 14, wherein at least one of the reusable bases of the trolleyassist system is a reusable base of the reusable base system.

21. A trolley-assist system according to claim 20, further comprising one of a compression member and a tension member for the or each reusable base system, the compression member or the tension member being coupled between the respective anchor base and the respective support structure.

22. A trolley-assist system according to claim 20 or 21, when dependent on claim 17, wherein each end support structure is supported by a reusable base system.

23. A method of assembly of a trolley-assist system according to any of claims 15 to 22, comprising:positioning the plurality of reusable bases adjacent to a mining vehicle haul road;attaching each support structure of the plurality of support structures to a corresponding reusable base; andmounting, to each of the plurality of support structures, an overhead power cable for providing electrical power to a mining vehicle, such that the overhead power cable extends between the plurality of support structures.

24. A method of assembly according to claim 23, further comprising positioning a first set of the plurality of reusable bases to conform to a substantially linear section of the mining vehicle haul road, the reusable bases of the first set being spaced apart by a first distance.

25. A method of assembly according to claim 24, wherein the first distance is between about 30 m and about 50 m.

26. A method of assembly according to any of claims 23 to 25, further comprising positioning a second set of the plurality of reusable bases to conform to a curved section of the mining vehicle haul road, the reusable bases of the second set being spaced apart by a second distance.

27. A method of assembly according to claim 26, wherein the second distance is between about 15 m and about 35 m.

28. A method of assembly according to claim 26 or 27, wherein the first distance is greater than the second distance.

29. A method of assembly according to any of claims 26, 27 or 28, further comprising positioning a plurality of first sets of the plurality of reusable bases, and a plurality of second sets of the plurality of reusable bases.

30. A method of assembly according to any of claims 26 to 29, wherein at least one of the plurality of reusable bases of the first set of the plurality of reusable bases is also in the second set of the plurality of reusable bases.

31. A method of assembly according to claim 26 to 30, when dependent on claim 21, at least one of the plurality of reusable bases of the, or each, second set comprises at least one reusable base system.

32. A method of assembly according to claim 31, comprising coupling the or each anchor base to the corresponding support structure via a compression member when said support structure is interior to the curved section of the mining vehicle haul road.

33. A method of assembly according to claim 31 or 32, comprising coupling the or each anchor base to the corresponding support structure via a tension member when said support structure is exterior to the curved section of the mining vehicle haul road.

34. A method of assembly according to any of claims 23 to 33, when dependent on claims 17 and 21, further comprising positioning the two end support structures at the ends of the trolley-assist system, each end support structure being supported by a reusable base system, wherein the respective anchor bases are positioned substantially in line with the overhead power cable.

35. A method of assembly according to claim 34, comprising coupling each anchor base to the corresponding end support structure via a tension member.

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