MXPA99010581A - Partly retractable construction platform - Google Patents

Abstract

A construction platform comprising a stationary support structure (4) adapted to be fixedly secured to the floor (10) of a building under construction and project from the edge (18) of the building to a predetermined maximum extent, and a movable desk (5) mounted on the stationary support (4) which may be extended as a cantilever therefrom or retracted into at least substantial registration therewith.

Description

PARTIALLY RETRACTABLE CONSTRUCTION PLATFORM DESCRIPTION OF THE INVENTION This invention is related to the so-called construction platforms. That is to say with temporary loading platforms, which, during use, are projected from above the floors of multi-storey buildings under construction, to act as loading platforms for the reception of cargo of construction material and the like deposited in the platform by means of a crane. Construction platforms are widely used in the construction of buildings with steel or reinforced concrete structures where the facade of the building does not support loads, and are not placed until after the main supporting structure of the building has been completed, and its main internal accessories have been installed. Building platforms usually comprise an interior portion, which rests on and is fixed to an edge limit of the floor of a building, and an exterior portion, including a landing deck, which extends as a bracket from the interior portion. even beyond the edge of the floor. Conveniently, the inner portion may comprise a base structure adapted to rest on the floor and a plurality of extendable supports extending from the base structure to the lower part of the next higher floor where the base structure, and therefore the platform as a whole, is held in position. So far, the construction platforms have been divided into two classes, that is, fixed deck platforms and mobile deck platforms. Fixed deck platforms have internal and external portions integrally joined with a single structure. They are simple in design, robust and inexpensive compared to movable roof platforms. However, they suffer from the inability to project from the building during the entire construction period and require to be off-center in the vertical direction through one face (or faces) of the building so that the higher platforms do not obstruct the rope of a crane that deposits a load on, or that lifts a load of, a lower platform. This, in turn, requires the use of a costly long-range crane, to service all the platforms in place, if the crane operates from a fixed location, as usual. Mobile decking platforms, examples of which are shown in U.S. Patent 4,444,289 (Jungman) and International Patent Application No. PCT / AU94 / Q0509 (Preston) have the outer portion movably mounted on the inner portion, so as to be It can retract when it is not being used to leave the face of the building free of obstructions. This solves the aforementioned disability of fixed deck platforms, but at a cost of a more heavily constructed and more complicated platform due to the need to provide a two-part telescopic base structure with sufficient translaps between the parts to allow movement. of bending applied by the external part extended to the inner part when being resisted. In addition the outer part has to be much more heavily designed to give it proper rigidity as it provides little or no clamp effect when it is attached to the floor of the building. For these reasons, mobile deck platforms have not been widely adopted compared to fixed deck platforms. The present invention arose from the simple appreciation that the rope of a crane must extend through the center of gravity of the load, and thus is necessarily separated from the load of a building when a load is raised or lowered next to the load. building In this way a. The degree of permanent projection of a higher platform is not objectionable, in that it will not interfere with the deposition of a load on a lower platform even if it is directly below on the highest platform.

A first aspect of the present invention consists of a construction platform comprising a stationary support structure adapted to be fixedly secured to the floor of a building under construction and project from the edge of a building to a predetermined maximum extent, and a movable roof mounted on the stationary support structure which can be extended as a bracket thereof or can be retracted substantially in accordance with this, characterized in that a connecting means projects from the lateral side of the stationary support structure in a end thereof, and during use the splice means are adapted to make contact with the edge of the building floor to ensure that the stationary support structure projects from the edge of the building to the predetermined maximum extent. Preferably, the support structure includes two transversely spaced apart substantially parallel beams, and two pairs of adjustable length struts respectively associated with the guide beams and projecting upwards therefrom, and wherein in each pair of struts, the The stringer closest to the edge of the building is located at or near the place in the support structure where the lifting force of the moving cover is retracted when the moving cover is in an extended position during use. Preferably, the stationary support structure projects from the edge of the building to a predetermined maximum extension of no more than two and a half meters. Preferably, the stationary support structure projects from the edge of the building to a predetermined maximum extent of approximately one and a half meters. Preferably, the support structure includes two substantially parallel transversely spaced I-beams, and the movable cover includes two smaller I-shaped beams transversely spaced apart, each of the smaller I-beams of the roof. mobile is at least partially nested within the flanges of a respective I-shaped beam of the supporting structure and adapted for the -movement together with it. . Preferably, at least one first roller is rotatably connected to each I-beam of the support structure, and the first roller is adapted to run between the two flanges of the respective smaller I-beam of the movable cover .

Preferably, at least one second roller is rotatably connected to each smaller I-beam of the movable cover, and the second roll is adapted to run between two flanges of the respective I-beam of the support structure. In a second aspect, the present invention consists of a hybrid construction platform that includes a stationary interior portion adapted to project from the edge of a building to a predetermined maximum extent, and a movable portion mounted on the stationary portion which can be extended as a bracket therefrom or it may be retracted to enter at least substantial agreement therewith, characterized in that the splice means project from the underside of the support structure at one end thereof, and in use , the splice means are adapted to make contact with the edge of the building to ensure that the stationary interior portion projects from the edge of the building to the predetermined extent. Preferably, the stationary interior portion is adapted to project from the edge of the building to a predetermined maximum extension of no more than two and a half meters. Preferably, the stationary interior portion is adapted to project from the edge of the building to a predetermined maximum extent of approximately one and a half meters. While the benefits of mobile deck platforms are generally retained,, substantial additional advantages flow from this hybrid construction compared to the previously known fully retractable mobile deck platforms of the comparable roofing area. For example, the movable portion may be more lightly constructed because its corbel length is reduced and the reaction points between the movable portion and the stationary portion may be more widely separated in the direction of movement, resulting in a considerable reduction in the mass of the moving portion and ease of movement accordingly. The lateral anchor for the stationary portion can be placed below its outer part in the floor plan of the building. This allows the movable portion to be placed closer to the floor surface, consequently reducing the height of the ramp so that the forklift trucks and the like pass over and outside the movable portion. BRIEF DESCRIPTION OF THE DRAWINGS By way of example, one embodiment of the invention described above is described in detail below with reference to the accompanying drawings.

Figure 1 is a diagrammatic side elevational view of a first embodiment of a construction platform according to the invention in its retracted configuration. Figure 2 is a view similar to that of the figure 1 of the platform of that figure in its extended configuration. Figure 3 is a diagrammatic side elevation view having a second embodiment of a construction platform according to the invention in its extended configuration. Figure 4 is a view below the platform of figure 3 with part of the floor of the cut building. Figure 5 is an enlarged schematic view of the nested rule of laminated beam / roll of the smaller roller wheel which can be used with the first or second embodiment of the construction platform shown in Figures 1 to 4. The Figure 6 is an enlarged schematic view of the nested laminated beam / roller arrangement of the larger roller wheel which can be used with the first or second embodiment of the construction platform shown in Figures 1 to 4.

Figure 7 is a perspective view of a third embodiment of a construction platform according to the invention. Figure 8 is a perspective view of two construction platforms of the type shown in Figure 7 secured to a building under construction. Figure 9 is a perspective view of a construction platform number of the type shown in Figure 7 secured to a building under construction. The first and second embodiments of the platforms shown in Figures 1 to 4 each comprise a stationary support structure 4, and a movable cover portion 5 adapted to move between a retracted configuration and an extended configuration during use. The only difference between the two modes is that the mobile cover 5 of the first mode extends to an additional extension compared to that of the mobile platform in the second mode. The first and second modalities have similar components, and similar reference numbers are used for both modalities. In each embodiment, a stationary support structure 4 comprises two laminated steel joists 6 (guide beams), substantially parallel parallel. These beams can be sectioned in channel, but preferably are conventional I-beams, comprising a central vertical network and upper and lower flanges substantially horizontal. The joists 6 are attached to the base structure for the stationary portion 4 by means of at least one cross member (not shown) extending from one to the other at one or near its inner ends, and by a structure 7 of ladder, comprising vertical uprights 8 and steps 9. According to a feature of the present invention, the stair structure 7 is fixed to the bottom sides of the lower flanges of the joists 6, so that the structure is substantially in the same plane as that of the 10th floor of the building in which the joists 6 can rest. By preference all the components of the stationary support structure 4 mentioned above weld together to form a rigid unitary structure. The stationary support structure 4 is fixedly held in place by 4 (two pairs of) extending supports (or tie rods), each pair of supports 11, 11b are associated with each beam 6. Only a pair of supports 11, 11b are shown in Figures 1-3. These supports may be hydraulic cylinders, but are preferably in the nature of a telescopic jack. They can butt a next higher floor (not shown) and serve to hold the stationary support structure 4 freely in position. It should be noted that the ladder structure 7 serves as a matching splice for the stationary support structure 4. When it makes contact with edge 18 of the 10th floor, then the stationary support structure 4 is projected (cantilevered) from the floor to the designed extension, which is preferably approximately one and a half meters. That number has been selected after considerable research and observation as to the minimum distance by which the crane motors normally separate the rope from the crane of a building at the time of depositing a load on the fixed platforms. However, it should be understood that the designed extension to which the stationary support structure is projected may be up to two and a half meters. The movable cover portion 5 comprises two additional laminated steel beams 12, somewhat smaller in cross section than the joists 6, a cover 13, safety perimeter barriers 14 extending along the side edges and the end edge of the cover 13. The joists 12 can also be I-beams and their flanges are nested between the flanges of the joists 6 so that they can be telescopically moved therein. The movement can be facilitated by the rollers 15 mounted for rotation on the joists 6 for coupling with the flanges of the joists 12, and rollers 16 mounted for rotation on the joists 12 for coupling with the flanges of the joists 6, as shown in Figures 5 and 6. When nesting the flanges of the joists 12 and 6, the rolling rollers 15 and 16 in contact with the flanges, a uniform movement of the movable cover portion 5 with respect to the supporting structure 4 it is achieved, and reduces the possibility of accumulating dust. In r to allow easy rolling of the rollers 15 and 16 along the flanges, a small space (not shown) can be preferably provided between each roller and the respective flanges as they roll along. In each pair of supports 11, the supports are located at the inner end of the stationary support structure 4, while the supports 11 b are located in the stationary support structure 4, preferably in line with or close to where the lifting force F of the mobile cover 5 is reacting, when the cover 5 is in its extended position during use as shown in Figure 2. During use, as a result of the partially supported cantilevered stationary support structure 4, the point The pivoting platform of the mobile platform 5 is capable of extending further outward from the edge of the building, than can be achieved with the mobile deck platforms of the prior art. Figures 7 to 9 show a third embodiment of a construction platform accng to the invention. Figure 8 shows two fixed construction platforms to the respective adjacent floors of a building under construction. Both platforms have their cantilevered stationary support structures 4 to a predetermined maximum extension of about one and a half meters from the edge of the building 18, and placed at their predetermined maximum extent by the stair structures 7 which act as coincidence joints. The upper platform has its movable cover portion 5a in a retracted position, while the lower platform has its movable cover portion 5b in an extended position during use. A crane rope 20 is capable of lowering and raising a load 21 to and from the lower platform without interfering with the upper platform. It should be readily understood by those skilled in the art that various modifications can be made to the construction platforms as described above without departing from the spirit and scope of the invention. For example, the number and position of the supports (or braces) in the stationary support structure may differ from those shown in the aforementioned modalities.

Claims (10)

1. CLAIMS 1. A construction platform comprising a stationary support structure adapted to be fixedly secured to the floor of a building under construction and project from the edge of the building to a predetermined maximum extent, and a movable roof mounted on a stationary support structure. which may extend as a bracket therefrom or may be retracted to enter at least substantially in accordance therewith, characterized in that the splice means project from the underside of the stationary support structure at one end of the In use, the splice means is adapted to contact the edge of the building floor to ensure that the stationary support structure projects from the edge of the building to the predetermined maximum extent. The construction platform according to claim 1, characterized in that the supporting structure includes two substantially parallel transversely spaced guide beams, and two pairs of adjustable length tiers respectively associated with the guide beams and projecting upwards. of the same, and where of each pair of braces, the brace closest to the edge of the building is located at or near the place in the support structure where the lifting force of the movable cover is reacting when the movable cover is in place. its extended position during use. 3. The construction platform according to claim 1, characterized in that the stationary support structure projects from the edge of the building to a predetermined maximum extension of no more than two and a half meters. . The construction platform according to claim 1, characterized in that the stationary support structure projects from the edge of the building to a predetermined maximum extension of approximately one and a half meters. The construction platform according to claim 1, characterized in that the support structure includes two substantially parallel transversely spaced apart I-beams, and the movable cover includes two smaller I-shaped beams substantially parallel transversely spaced, each one of the smaller I-shaped beams of the movable cover is at least partially nested within the flanges of a respective I-shaped beam of the support structure and adapted for movement therewith. The construction platform according to claim 6, characterized in that at least one first roller is rotatably connected to each I-beam of the support structure, and the first roller is adapted to roll between two flanges of the smaller respective I-shaped beam of the movable cover. The construction platform according to claim 6, characterized in that at least one second roller is rotatably connected to each smaller I-beam of the movable cover and the second roll is adapted to roll between two flanges of the respective I-shaped beam of the support structure. 8. The hybrid construction platform that includes a stationary interior portion adapted to project from the edge of a building to a predetermined maximum extent, and a movable mounted portion of the stationary portion which may be extended as a bracket thereof or retracted in at least one substantial register therewith, characterized in that a splice means is projected from the underside of the support structure at one end thereof, and during use the splice means are adapted to come into contact with the edge of the building to ensure that the stationary interior portion projects from the edge of the building to the predetermined extent. The hybrid construction platform of claim 8, characterized in that the stationary interior portion is adapted to project from the edge of the building to a predetermined maximum extension of no more than two and a half meters. The hybrid construction platform of claim 8, characterized in that the stationary interior portion is adapted to project from the edge of the building to a predetermined maximum station of approximately one and a half meters. KESUMEN A construction platform comprising a stationary support structure adapted to be fixedly secured to the floor of a building under construction and project from the edge of the building to a predetermined maximum extent, and a movable platform mounted on the stationary support structure which it can extend as a corbel from it or retract to enter into at least a substantial concordance with it.