AU2007201646A1 - Scaffold Stairway - Google Patents
Scaffold Stairway Download PDFInfo
- Publication number
- AU2007201646A1 AU2007201646A1 AU2007201646A AU2007201646A AU2007201646A1 AU 2007201646 A1 AU2007201646 A1 AU 2007201646A1 AU 2007201646 A AU2007201646 A AU 2007201646A AU 2007201646 A AU2007201646 A AU 2007201646A AU 2007201646 A1 AU2007201646 A1 AU 2007201646A1
- Authority
- AU
- Australia
- Prior art keywords
- web
- flange
- stairway unit
- unit according
- scaffold
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F11/00—Stairways, ramps, or like structures; Balustrades; Handrails
- E04F11/02—Stairways; Layouts thereof
- E04F11/022—Stairways; Layouts thereof characterised by the supporting structure
- E04F11/025—Stairways having stringers
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F11/00—Stairways, ramps, or like structures; Balustrades; Handrails
- E04F11/02—Stairways; Layouts thereof
- E04F11/104—Treads
- E04F11/112—Treads of metal or with an upper layer of metal
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G27/00—Temporary arrangements for giving access from one level to another for men or vehicles, e.g. steps, ramps
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G5/00—Component parts or accessories for scaffolds
- E04G5/10—Steps or ladders specially adapted for scaffolds
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Steps, Ramps, And Handrails (AREA)
Description
P/00/011 28/5/91 Regulation 3.2
AUSTRALIA
Patents Act 1990
ORIGINAL
COMPLETE SPECIFICATION STANDARD PATENT Name of Applicant: Actual Inventors Address for service is: PCH Group Limited Paul Gregory Noel Parafina WRAY ASSOCIATES Level 4, The Quadrant 1 William Street Perth, WA 6000 Attorney code: WR Invention Title: Scaffold Stairway The following statement is a full description of this invention, including the best method of performing it known to me:- -2- Scaffold Stairway Field of the Invention This invention relates to a scaffold stairway unit.
Background Art Scaffolding is often erected on sites at which construction or maintenance work is being performed. Typically, scaffolding has various levels and in certain cases stairways are required between adjacent levels. The stairways may be provided by scaffold stairway units which are installed as part of the scaffolding. A scaffold stairway unit typically comprises an upper landing section, a lower landing section and a stairway section providing a flight of stairs extending between the two landing sections, all of which are constructed as a single unit. When the scaffold stairway unit is installed between two adjacent levels in a scaffold construction, the upper landing section is attached to a horizontal scaffolding component at the upper level and the lower landing section is attached to a horizontal scaffolding component at the lower level.
It is advantageous that the scaffold stairway unit be of a weight which can allow manhandling by at most two workers, and preferably by one worker only. This avoids the need for specialised lifting equipment (such as hoists or cranes) for installation and removal of the scaffold stairway unit.
Because of the need for light weight, it is common for scaffold stairway units to be constructed of aluminium. There are, however, certain sites at which aluminium scaffolding components (including scaffold stairway units) are deemed unacceptable. Such sites include alumina refineries. In such circumstances, it is necessary for all scaffolding components (including scaffold stairway units) to be of non-aluminium material, typically steel. Construction of scaffold stairway units in a conventional manner using steel rather than aluminium does, however, result in a unit which can be too heavy for manhandling by one or two workers.
-3- It is against this background, and the problems and difficulties associated therewith, that the present invention has been developed.
The preceding discussion to the invention is intended only to facilitate an understanding of the present invention. It should be appreciated that the discussion is not an acknowledgement or an admission that any of the material referred to was or is part of the common general knowledge in Australia as at the priority date of the application.
Disclosure of the Invention According to a first aspect of the invention there is provided a scaffold stairway unit comprising two strings and treads supported therebetween, the strings and treads being engineered for sufficient load-bearing strength and also for weight reduction to enable manhandling by at most two workers.
The engineering of the strings and treads for strength and also weight reduction involves appropriate materials selection. Typically, material selected for the strings may comprise high tensile steel, and the material selected for the treads may also comprise high tensile steel.
Preferably, the scaffold stairway unit further comprises an upper landing section and a lower landing section, the strings and treads providing a flight of stairs extending between the two landing sections. The landing sections are also engineered for sufficient load-bearing strength and also for weight reduction.
Preferably, each string provides a support frame for the upper and lower landings as well as support for the treads.
Preferably, each string comprises a beam configured as a thin-walled metal section. Typically, the beam comprises a web having an inner face, an outer face, an upper longitudinal edge and a lower longitudinal edge, a flange extending laterally from the outer face at each longitudinal edge and an inwardly-turned lip at the outer end of each flange, each flange and lip cooperating with the adjacent -4portion of the web to define an inwardly-facing channel adjacent the outer face of the web. This cross-sectional configuration provides the beam with load-bearing strength.
Preferably, the web has a plurality of apertures spaced at intervals along the length thereof for weight reduction purposes. In one embodiment, there are two apertures in each section of the web between adjacent treads.
Preferably, each aperture is incorporated in a boss which surrounds the aperture and which is offset from the general plane of the web to provide for strengthening of the web and also the beam.
Preferably, each tread comprises a rectangular plate configured to define a loadbearing surface which provides the top face of the tread, each longitudinal edge of the plate being turned downwardly and inwardly away from the top face to provide an inwardly facing channel, and each end edge of the rectangular plate being turned downwardly away from the top face to define a flange.
The inwardly facing channels provide reinforcing ribs at the longitudinal edges of the tread.
The flange has an outer face which locates against the inner face of the web of the adjacent string, the flange being attached to the web of the adjacent string.
Conveniently, the flange is attached to the web by being welded thereto.
Preferably, the flange is welded to the web by at least three welds arranged in triangular configuration. In this regard, the at least three welds may comprise two welds deposited between the web and the free edge of the flange, and a third weld deposited between the web and an internal edge within the flange. The internal edge of the flange may be defined by the periphery of an aperture within the flange. Typically, the aperture comprises a slot formed in the flange.
The flange may project beyond the two longitudinal edges of the adjacent string and may be welded to those longitudinal edges as part of the welded connection therebetween.
A hole may be provided in each flange at the end of the inwardly facing channel along each longitudinal edge of the tread. The holes provide for drainage of any water or debris such as sand which might accumulate in the channel during storage of the stairway unit.
According to a second aspect of the invention there is provided a scaffold stairway unit comprising two strings and treads supported therebetween, each string comprising a web having an inner face, an outer face, an upper longitudinal edge and a lower longitudinal edge, a flange extending laterally from the outer face at each longitudinal edge and an inwardly-turned lip at the outer end of each flange, each flange and lip cooperating with the adjacent portion of the web to define an inwardly facing channel adjacent the outer face of the web, the web having a plurality of apertures spaced at intervals along the length thereof for weight reduction, each tread having two opposed outer faces each of which is located adjacent the inner face of the web of the adjacent string, the outer faces each being attached to the web of the adjacent string.
According to a third aspect of the invention there is provided a scaffold stairway unit comprising two strings, treads supported therebetween, an upper landing section and a lower landing section, the treads providing a flight of stairs extending between the two landing sections, each string providing a support frame for the upper and lower landings as well as support for the treads, each string comprising a web having an inner face, an outer face, an upper longitudinal edge and a lower longitudinal edge, a flange extending laterally from the outer face at each longitudinal edge and an inwardly-turned lip at the outer end of each flange, each flange and lip cooperating with the adjacent portion of the web to define an inwardly facing channel adjacent the outer face of the web, the web having a plurality of apertures spaced at intervals along the length thereof for weight reduction, each tread having two opposed outer faces each of which is located adjacent the inner face of the web of the adjacent string, the outer faces each being attached to the web of the adjacent string.
According to a fourth aspect of the invention there is provided a scaffolding construction comprising two levels and a scaffold stairway unit extending -6therebetween, the scaffold stairway unit being in accordance with any one of the first, second and third aspects of the invention as defined above.
Brief Description of the Drawings The invention will be better understood by reference to the following description of one specific embodiment thereof as shown in the accompanying drawings in which: Figure 1 is a perspective view from the upper side of a scaffold stairway unit according to the embodiment; Figure 2 is a view similar to Figure 1 except that it is viewed from the underside; Figure 3 is a side elevational view of the scaffold stairway unit; Figure 4 is a fragmentary view of the scaffold stairway unit illustrating two strings and a tread supported therebetween; Figure 5 is a fragmentary view of the scaffold stairway unit illustrating in particular a lower landing section thereof; Figure 6 is a fragmentary perspective view of the scaffold stairway unit illustrating in particular an upper landing section thereof; Figure 7 is a fragmentary perspective view illustrating in particular the connection between an end of one tread and the adjacent string; Figure 8 is a cross-sectional view of one of the treads; Figure 9 is a cross-sectional view of one of the strings; -7- Figure 10 is a schematic view of a scaffolding construction incorporating a stairway system extending between various levels, the stairway system being assembled from scaffold stairway units according to the embodiment; Figure 11 is a side elevational view of the scaffolding construction; and Figure 12 is a plan view of the scaffold construction illustrating the stairway system.
Best Mode(s) for Carrying Out the Invention Referring to the drawings, there is shown a scaffold construction 10 having four levels 11, 12, 13 and 14, and a stairway system 15 providing access between the various levels.
The scaffolding construction 10 comprises standards 17 interconnected by horizontal scaffolding elements 18 and bracing 19.
The stairway system 15 is assembled from a series of scaffold stairway units each in accordance with the embodiment. In the scaffold construction illustrated in the drawings, there are three scaffold stairway units 20a, 20b and Each stairway unit 20 is formed of steel and comprises a lower landing section 21, an upper landing section 23, and a flight of stairs 25 extending between the two landing sections.
As best seen in Figures 1 to 9, each scaffold stairway unit 20 comprises two strings 31 disposed in spaced apart side-by-side relationship. Each string 31 comprises a lower section 33, an upper section 35 and an inclined intermediate section 37 extending between the lower and upper sections. The lower section 33 supports a platform 41 to define the lower landing section 21. The upper section supports a platform 43 to define the upper landing section 23.
Treads 45 are supported between the intermediate sections 37 of the two strings 31.
-8- Each string 31 comprises a beam 51 configured as a thin-walled metal section. In this embodiment, the thin-walled metal section comprises 1.9mm high tensile steel The beam 51 comprises a web 53 having an inner face 55 and an outer face 57.
The web 53 also has an upper longitudinal edge 58 and a lower longitudinal edge 59. A flange 61 extends laterally from the outer face 57 at each longitudinal edge 58, 59 of the web 53. An inwardly-turned lip 63 is provided at the outer end of each flange 61. With this arrangement, each flange 61 and the associated lip 63 cooperates with the adjacent portion of the web 53 to define an inwardly facing channel 65 adjacent the outer face 57 of the web. This cross-sectional configuration provides the beam with load-bearing strength.
Each web 53 has apertures 67 spaced at intervals along the length thereof. In this embodiment, there are two apertures 67 in the section of each web between adjacent treads 45. The apertures 67 provide for weight reduction in the strings.
Each aperture 67 is incorporated in a boss 68 which surrounds the aperture and which is offset from the general plane of the web 53 on the outer side 57 thereof (as best seen in Figure 9) to provide for strengthening of the web 53 and also the beam 51.
Each tread 45 comprises a rectangular metal plate 71 configured to define a loadbearing surface 73 which provides the top face 74 of the tread. In this embodiment, the metal plate 71 comprises 1.5mm high tensile steel. The metal plate 71 has two longitudinal edges 75 and two end edges 77. The portion of the plate 71 at each longitudinal edge 75 is turned downwardly and inwardly away from the top face 74 to provide an inwardly facing channel 79. The end portion of the plate at each end edge 77 is tumed downwardly away from the top face 74 to define a depending flange 81. The flange 81 has an outer face 83 which locates adjacent the inner face 55 of the adjacent string 31. The flange 81 is attached to the web 53 of the adjacent stringer by being welded thereto. Specifically, the flange 81 is welded to the web 53 by three welds 91, 92, 93 arranged in a triangular configuration, as best seen in Figures 7 and 8. The two welds 91, 92 are deposited between the web 53 and the free edge 85 of the flange. The third -9weld 93 is deposited between the web 53 and an internal edge 87 within the flange 81. The internal edge 87 is defined by the periphery of an aperture 89 of slot configuration within the flange 81. The triangular configuration of the three welds 91, 92, 93 provides for strength of the welded connection between the flange 81 and the web 53.
Each flange 81 projects beyond the two longitudinal edges 58, 59 of the adjacent string 31 and are welded to those longitudinal edges by welds 97, as best seen in Figure 4. The welded connection between each tread 45 and string 31 thus comprises the three welds 91, 92, 93 in triangular configuration and the additional welds 97.
The channels 79 at the longitudinal edges of the treads 45 provide strengthening ribs and also present a rounded edge face 80. The rounded edge face provides an aesthetically pleasing appearance and also avoids presentation of a sharp edge to users of the stairway.
There is a possibility that the channels 79 could accumulate water or debris (such as sand) when the stairway unit 20 is in storage or deposited on site.
To address this problem, a hole 101 is provided in each flange 81 at the ends of each channel 79. Any water or debris accumulating within the channel 79 can discharge through the particular hole 101 which is lower most when the scaffold stairway unit is being carried from the storage location to site for use.
The top face 74 of each tread 45 is configured with protrusions 103 incorporating holes 105. This provides the top face 45 with a tread pattern which provides grip for uses of the stairs. Further, the holes 105 afford some weight reduction.
The platforms 41, 43 at the lower and upper landing sections 21, 23 are configured with protrusions 103 and holes 105 for similar purposes.
The platforms 41, 43 are also made of the same steel as the treads The outer edge of the lower landing section 21 and the outer edge of the upper landing section 23 are each configured to engage with horizontal scaffolding elements 18 of the scaffold construction 10. In this regard, the ends of each string 31 are provided with a rebated portion 111 into which a horizontal scaffolding element 18 can be received. In this way, the scaffolding stairway unit 20 is supported on, and extends between, two horizontal scaffolding elements 18, one at the lower level and the other at the upper level between which the scaffolding unit extends.
In establishing the stairway system 15 in the scaffold construction 10, adjacent stairway sections 20 are offset with respect to each other so that the upper landing section 23 of a lower scaffold stairway unit 20 locates adjacent to, and at the same level as, the lower landing section 21 of the scaffold stairway unit immediately above it. In this way, the lower and upper landing sections 21, 23 are at the same level and provide for a smooth transition between the two stairway units.
Because of the way in which each scaffold stairway unit 20 is engineered, it offers sufficient load-bearing strength and also is sufficiently light to enable manhandling by two workers at most, and preferably by one worker only. In this way, the scaffold stairway units 20 can be installed in, and removed from, the scaffold construction 10 by manhandling without the need for specialised lifting equipment (such as a hoist or a crane).
Because the stairway units are constructed of steel, they can be used in environments where aluminium is deemed unacceptable.
Modifications and improvements can be made without departing from the scope of the invention.
Throughout the specification, unless the context requires otherwise, the word "comprise" or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated integer or group of integers but not the exclusion of any other integer or group of integers.
Claims (21)
1. A scaffold stairway unit comprising two strings and treads supported therebetween, the strings and treads being engineered for sufficient load- bearing strength and also for weight reduction to enable manhandling by at most two workers.
2. A scaffold stairway unit according to claim 1 further comprising an upper landing section and a lower landing section, the strings and treads providing a flight of stairs extending between the two landing sections, the landing sections are also engineered for sufficient load-bearing strength and also for weight reduction.
3. A scaffold stairway unit according to claim 1 or 2 wherein the engineering of the strings and treads for strength and also weight reduction involves appropriate materials selection.
4. A scaffold stairway unit according to claim 2 or 3 wherein the engineering of the landing sections for strength and also weight reduction involves appropriate materials selection. A scaffold stairway unit according to claim 3 or 4 wherein the materials selected comprise high tensile steel.
6. A scaffold stairway unit according to any one of the preceding claims wherein each string provides a support frame for the upper and lower landings as well as support for the treads.
7. A scaffold stairway unit according to any one of the preceding claims wherein each string comprises a beam.
8. A scaffold stairway unit according to claim 7 wherein the beam is configured as a thin-walled metal section. -12-
9. A scaffold stairway unit according to claim 7 or 8 wherein the beam comprises a web having an inner face, an outer face, an upper longitudinal edge and a lower longitudinal edge, a flange extending laterally from the outer face at each longitudinal edge and an inwardly-turned lip at the outer end of each flange, each flange and lip cooperating with the adjacent portion of the web to define an inwardly-facing channel adjacent the outer face of the web. scaffold stairway unit according to claim 9 wherein the web has a plurality of apertures spaced at intervals along the length thereof for weight reduction purposes.
11.A scaffold stairway unit according to claim 10 wherein there are two apertures in each section of the web between adjacent treads.
12.A scaffold stairway unit according to claim 10 or 11 wherein each aperture is incorporated in a boss which surrounds the aperture and which is offset from the general plane of the web to provide for strengthening of the web and also the beam.
13.A scaffold stairway unit according to any one of the preceding claims wherein each tread comprises a rectangular plate configured to define a load-bearing surface which provides the top face of the tread, each longitudinal edge of the plate being turned downwardly and inwardly away from the top face to provide an inwardly facing channel, and each end edge of the rectangular plate being turned downwardly away from the top face to define a flange.
14.A scaffold stairway unit according to claim 13 wherein the flange has an outer face which locates against the inner face of the web of the adjacent string, the flange being attached to the web of the adjacent string. scaffold stairway unit according to claim 14 wherein the flange is attached to the web by being welded thereto. -13-
16.A scaffold stairway unit according to claim 15 wherein the flange is welded to the web by at least three welds arranged in triangular configuration.
17.A scaffold stairway unit according to claim 16 wherein at least three welds comprise two welds deposited between the web and the free edge of the flange, and a third weld deposited between the web and an internal edge within the flange.
18.A scaffold stairway unit according to claim 17 wherein the internal edge of the flange is defined by the periphery of an aperture within the flange.
19.A scaffold stairway unit according to claim 18 wherein the aperture comprises a slot formed in the flange. scaffold stairway unit according to any one of claims 16 to 19 wherein the flange projects beyond the two longitudinal edges of the adjacent string and is welded to those longitudinal edges as part of the welded connection therebetween.
21.A scaffold stairway unit according to any one of claims 13 to 20 wherein a hole provided in each flange at the end of the inwardly facing channel along each longitudinal edge of the tread.
22.A scaffold stairway unit comprising two strings and treads supported therebetween, each string comprising a web having an inner face, an outer face, an upper longitudinal edge and a lower longitudinal edge, a flange extending laterally from the outer face at each longitudinal edge and an inwardly-turned lip at the outer end of each flange, each flange and lip cooperating with the adjacent portion of the web to define an inwardly facing channel adjacent the outer face of the web, the web having a plurality of apertures spaced at intervals along the length thereof for weight reduction, each tread having two opposed outer faces each of which is located adjacent the inner face of the web of the adjacent string, the outer faces each being attached to the web of the adjacent string. -14-
23.A scaffold stairway unit comprising two strings, treads supported therebetween, an upper landing section and a lower landing section, the treads providing a flight of stairs extending between the two landing sections, each string providing a support frame for the upper and lower landings as well as support for the treads, each string comprising a web having an inner face, an outer face, an upper longitudinal edge and a lower longitudinal edge, a flange extending laterally from the outer face at each longitudinal edge and an inwardly-turned lip at the outer end of each flange, each flange and lip cooperating with the adjacent portion of the web to define an inwardly facing channel adjacent the outer face of the web, the web having a plurality of apertures spaced at intervals along the length thereof for weight reduction, each tread having two opposed outer faces each of which is located adjacent the inner face of the web of the adjacent string, the outer faces each being attached to the web of the adjacent string.
24.A scaffolding construction comprising two levels and a scaffold stairway unit extending therebetween, the scaffold stairway unit being in accordance with any one of the preceding claims. scaffold stairway unit substantially as herein described with reference to the accompanying drawings.
26.A scaffolding construction substantially as herein described with reference to the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2007201646A AU2007201646A1 (en) | 2006-04-13 | 2007-04-13 | Scaffold Stairway |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2006901955A AU2006901955A0 (en) | 2006-04-13 | Scaffold Stairway | |
| AU2006901955 | 2006-04-13 | ||
| AU2007201646A AU2007201646A1 (en) | 2006-04-13 | 2007-04-13 | Scaffold Stairway |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AU2007201646A1 true AU2007201646A1 (en) | 2007-11-01 |
Family
ID=38658066
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2007201646A Abandoned AU2007201646A1 (en) | 2006-04-13 | 2007-04-13 | Scaffold Stairway |
Country Status (1)
| Country | Link |
|---|---|
| AU (1) | AU2007201646A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT13548U1 (en) * | 2011-11-10 | 2014-03-15 | Metso Paper Inc | Stair construction for a catwalk |
| CN113482314A (en) * | 2021-08-12 | 2021-10-08 | 黑龙江省建工集团有限责任公司 | Attached lifting scaffold |
-
2007
- 2007-04-13 AU AU2007201646A patent/AU2007201646A1/en not_active Abandoned
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT13548U1 (en) * | 2011-11-10 | 2014-03-15 | Metso Paper Inc | Stair construction for a catwalk |
| CN113482314A (en) * | 2021-08-12 | 2021-10-08 | 黑龙江省建工集团有限责任公司 | Attached lifting scaffold |
| CN113482314B (en) * | 2021-08-12 | 2022-03-25 | 黑龙江省建工集团有限责任公司 | Attached lifting scaffold |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MK1 | Application lapsed section 142(2)(a) - no request for examination in relevant period |