Patent Application
20190225241
The present invention refers to an improvement developed for elevated guideway performing the function of supporting, guiding and propelling pneumatic transport vehicles for passengers and loads.
Patent documents PI 7703372-8, PI 7906255-5, PI 8301706-2, PI 8503504-1, PI 9502056-0, PI 9814160-0, PI 9912112-3, PI 0805188-7 and PI 0901119-6 disclose a pneumatic transport system comprising light vehicles preferably provided with trucks, each containing four metallic wheels with at least one of the axles connected to a pylon bolted to a propulsion plate, which is responsible for the conversion of the fluid thrust into mechanical work for moving the vehicles over rails seated on a special elevated guideway.
Mounted on vertical pillars, the elevated guideway, besides the classic function of supporting and guiding the vehicles, is also characterized by comprising a propulsion duct, a device intended to create a physical means for containment and spreading of the air flow generated by stationary power propulsion units. Made up of a heavy duty industrial blower and a valve set, the power propulsion units are responsible for increasing or reducing pressure in the hollow interior of the beams forming the elevated guideway.
The vehicle propulsion plate pylon moves longitudinally along the beams comprising the superstructure of the elevated guideway, which, conveniently, have an open profile cross section for allowing free passage of the propulsion plate through a central slot in the upper slab thereof. Documents PI 7906255-5, PI 8301706-2, PI 9814160-0, PI 0805188-7 and PI 0901119-6 describe this slot which is sealed preferably by the physical arrangement of two or more strips or tubes made of high strength and durability material, with excellent mechanical memory and with low superficial friction.
The beams of the elevated guideway superstructure can be made of concrete, steel, composite or mixed material, designed to absorb accidental loads caused by movement of the vehicle, as well as to withstand the dynamic strains of pressurization and depressurization within the propulsion duct.
The propulsion duct is bounded by the interior of the elevated guideway which can present typical cross sections of 0.49 m2, 1.0 m2, 1.44 m2 and 1.96 m2, depending, among other factors, on the thrust necessary to meet the designed transport capacities, on the dynamic performance, on the presence of sharp ramps in the altimeter project and on other related factors as well, which are analyzed on a case-to-case basis.
Document PI 9502056-0 discloses a secondary propulsion duct, which is mounted in parallel with the propulsion duct and allows the air flow generated by the power propulsion units to be discharged into the propulsion duct in two distinct positions, resulting in thrust on the propulsion plate of a vehicle located in the influence zone of the secondary propulsion duct. The zone of the secondary propulsion duct is normally positioned in the center region of the boarding platform of the stations, one being required for every guideway. The extension thereof is at least equivalent to the length of the longest vehicle designed to operate in the specific line This document neither gives details as to the technical and constructional features of the secondary propulsion duct nor describes its connections with the elevated guideway, being it restricted to present a mere schematic simplified diagram.
The object of the present invention is an improvement in elevated guideway for supporting, guiding and propelling pneumatic transport vehicles for passengers and loads that effectively surpasses said limitations of the state of the art.
In long distance and/or large traffic volume schedules, the most suitable structure for the elevated guideway from the technical and economic standpoint is now in prestressed and reinforced concrete, where the main elements of the beams and pillars are prefabricated parts. Armatures are left on the top of the pillars for integral connection with the respective mesostructured beams, and this is accomplished after the connection of pillars to the infrastructure (foundations).
Produced on the building site, the superstructure beams are preferably made in two halves and, to this end, two distinct sets of formworks molding the components are used, each corresponding to one of the sides of the cross section which is divided in the vertical axis positioned in the slot center. The components are not symmetrical, which most important distinction is that the left two-part component has a wider top table, to be used as an integrated emergency gangway for passengers and access of the maintenance team.
The manufacture of straight beams is carried out starting from formworks covering the full span length, whereas that of the curved beams is carried out through smaller modules carefully positioned in relation to each other on a fixed base, so as to form a polygonal line approaching with high degree of accuracy any designed continuous geometry.
After being transported and correctly positioned on the mesostructure, both components are joined through a niche already present in the lower slab. This juncture is made by means of a female-female type central fitting which is filled with a suitable structural resin. Subsequently, by means of connection armatures, the superstructure beam is made integral with the previous one and with the support structure for providing continuity to the elements forming the line.
The superstructure beams are designed to have a standard span of 30 m, with expansion joints at every 120 m, or four spans. According to the application, several other combinations are possible, without cross section change, such as for example increasing the standard span to 40 m, with expansion joints also at every 120 m or three spans.
The result is a structure forming porches to obtain a set with rigidity and dampening features capable of supporting the wind and/or seismic loads, gravity forces and vehicle mobile loads. Once the assembling process is ended, the beam is ready to receive its guideway protector and the two additions for installing the slot sealing components of the propulsion duct.
The guideway guard is made up of parts prefabricated separately from the rest of the beam structure, and it may be made of concrete or steel, within which tubes are embedded for receiving, on one side, electrical power supply cables and, on the other side, the control and telecommunications cables.
At the central ends defining the slot in the table of the propulsion duct there are struts for further fastening or molding the parts containing the exact angles for the correct mounting of the seal, in such a way to ensure its perfect tightness. These parts should be preferably made of microconcrete, metallic material, or some other suitable equivalent for the application.
As the last step of the assembly process the complements of the elevated guideway are installed, including: the protective railing for protection on the side emergency gangway, the rail fastening set through the web thereof, the rails for movement of the vehicle, the propulsion duct slot seal, the third and fourth vehicle electrical power supply rails, among others, according to the specific application
The present invention also relates to the cross section of the concrete beams containing the secondary propulsion duct. The secondary propulsion duct combined with the propulsion duct on the same beam forms a single non-separable structure with the latter. Being composed in a homogeneous manner, the beams comprise the standard propulsion duct, whose area is the default area of the propulsion plate and with the secondary propulsion duct in its lateral side, the latter being of closed section and smaller area, being used only for maneuvering a vehicle inside the boarding station zone and the power propulsion unit on predetermined operating situations.
The manufacturing process of the beams for the secondary propulsion duct follows the same principle as the one established for the beams characterizing only the propulsion duct, that is, the splitting of its structure in two. The difference is that the left two-part component is kept unchanged, whereas the right two-part component requires a specific formwork for molding the secondary propulsion duct.
The further steps of rendering the beams integral, adding of the guideway protector, the addition for installing the propulsion duct slot seal and the remaining guideway complements remain identical.
The new concept of elevated guideway for pneumatic transport system provides a beam manufacturing method of which the differential is a two-part cross section, contrary to prior art which uses a beam produced in a single step with monolithic form.
A substantial time saving is obtained by the innovative process due to its simplicity, fully dispensing with the use of internal molds for shaping the propulsion duct, eliminating the drawbacks of working in a confined environment and the difficulties in controlling concrete fluidity for homogenously filling the lower slab resulting in a homogeneous trace beam.
Additionally, manufacturing can be accelerated due to the higher serializing potential of the building site, since mechanical precision elements, which require fine adjustments, are treated separately in a second independent step, not influencing the rate of the first step, and making use of a team specially trained for this purpose.
The hyperstatic characteristic of the novel structure, differently from what is described in previous patents, expands the possibilities of advancing the elevated guideway superstructure in longer spans between pillars and with the section being maintained slender. This gain is still more pronounced in closed radius curves in which the beams being made integral with each other assure stability of the whole without requiring shortening of the standard span in the section involved. The solution of the invention keeps the center of gravity perfectly within the required limits by the security regulations against tipping, thus allowing for flexibility to overcome urban obstacles with the least possible visual impact.
The advantage of the beams forming the secondary propulsion duct resides in the simplicity of fitting the beam design employed in the remaining sections of the elevated guideway, in which only the propulsion duct is required. This is achieved by the addition of a lateral appendix oriented, due to technical and functional reasons, in the direction of the boarding platform of passenger stations, and which is made from the same material as the propulsion duct, and this adds inertia and stability to the original structure.
The invention further benefits from the production in two halves and in multiple steps, and the resulting elevated guideway aggregates robustness and durability with reduction of air flow noise along its trajectory, in addition to the low visual impact of a single and integrated structure of which the volume is partially hidden from passersby when they contemplate the elevated guideway.
The improvement in elevated guideway for supporting, guiding and propelling pneumatic transport vehicles for passengers and loads, object of the present invention, will be now described in detail based on the enclosed drawings, listed hereinafter:
After being transported and positioned on the mesostructure, both components (21 and 22) are joined through a niche (25) already present in the lower slabs (26). Preferably, this junction is made from a female-female type central fitting, which is filled with a suitable structural resin. Guideway guards (27) and the two additions (28) for installing the propulsion duct slot seal integrate the elevated guideway.
The manufacturing process of the beams for the secondary propulsion duct (13′) follows the same principle as the one established for the beams characterizing only the propulsion duct (7′), that is, the splitting of its structure in two. The difference is that the left two-part component (22) is kept unchanged, whereas the right two-part component (21′) requires a specific formwork for molding the secondary propulsion duct (13′).
| Number | Date | Country | Kind |
|---|---|---|---|
| BR 102017014747-9 | Jul 2017 | BR | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/BR2018/050228 | 7/6/2018 | WO | 00 |
