AU2015249033A1 - A hollow ventilation duct segment and method of forming the same - Google Patents
A hollow ventilation duct segment and method of forming the same Download PDFInfo
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- AU2015249033A1 AU2015249033A1 AU2015249033A AU2015249033A AU2015249033A1 AU 2015249033 A1 AU2015249033 A1 AU 2015249033A1 AU 2015249033 A AU2015249033 A AU 2015249033A AU 2015249033 A AU2015249033 A AU 2015249033A AU 2015249033 A1 AU2015249033 A1 AU 2015249033A1
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- duct wall
- duct
- coupling strip
- joiner sleeve
- wall
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Abstract
A HOLLOW VENTILATION DUCT SEGMENT AND METHOD OF FORMING THE SAME Abstract A hollow ventilation duct segment (10) comprises a duct wall (11), a coupling strip (16) and a joiner sleeve (20). The duct wall (11) has a first end (12), a second end (13), an inner surface (14) and an outer surface (15). The coupling strip (16) has a first end (17) and a second end (18). The coupling strip first end (17) is longitudinally positioned substantially between the duct wall first end (12) and the duct wall second end (13) and has one or more connector regions. The coupling strip second end (18) is substantially adjacent to the duct wall second end (13). The joiner sleeve (20) has a first end (21) and a second end (22). The joiner sleeve first end (21) is longitudinally positioned between the duct wall first end (12) and the coupling strip first end (17). The joiner sleeve second end (22) is substantially adjacent to the duct wall second end (13). Ku
Description
1 A HOLLOW VENTILATION DUCT SEGMENT AND METHOD OF FORMING THE SAME Field of the Invention [0001] The present invention generally relates a hollow ventilation duct segment and a method of forming the same. More particularly, the present invention relates to ventilation duct segments that can be interconnected to form a length of ventilation ducting. The ventilation ducting is of the kind typically used for providing air supply in underground mining and tunnelling operations. Background of the Invention [0002] Ventilation ducting for underground mining and tunnelling operations are known. Known mine ventilation ducting are typically formed by coupling duct segments together end-to-end. Eyelet type couplings provide a simple method of joining duct segments together. Eyelet type couplings include an eyeleted band and a joiner sleeve sandwiched between the eyeleted band and the inner surface of the duct wall. The joiner sleeve is foldable through 1800 from an inwardly facing storage and transport configuration to an outwardly facing use configuration. The duct segment is supplied to the installation site in the storage and transport configuration for compactness during transportation. In the use configuration, the joiner sleeve extends into the interior of an adjacent downstream duct segment, such that the eyeletted joins between the duct segments are not exposed to the internal air flow. Air pressure within the duct segments forces the joiner sleeve towards the internal surface of the duct walls which provides a tight seal at the join and thus reduces air leakage at the join. [0003] In known duct segments, the folding of the joiner sleeve to the use configuration creates an inwardly directed shoulder which directly faces the air flow and creates an internal air resistance at the end of the duct segment. This resistance impedes the aerodynamics of the ducting and thus decreases air flow along the ducting, requiring more and larger fans to deliver sufficient air flow to desired locations in the underground mines.
2 Object of the Invention [0004] It is an object of the present invention to substantially overcome one or more of the above disadvantages, or to at least provide a useful alternative. Summary of the Invention [0005] A first aspect of the present invention provides a hollow ventilation duct segment comprising: a duct wall having a first end, a second end, an inner surface and an outer surface; a coupling strip having a first end and a second end, the coupling strip first end being longitudinally positioned substantially between the duct wall first end and the duct wall second end and having one or more connector regions at or substantially adjacent thereto, the coupling strip second end being substantially adjacent to the duct wall second end; and a joiner sleeve having a first end and a second end, the joiner sleeve first end being longitudinally positioned between the duct wall first end and the coupling strip first end, the joiner sleeve second end being substantially adjacent to the duct wall second end, the joiner sleeve being fixed between the duct wall inner surface and the coupling strip. [0006] Preferably, the duct segment is foldable through about 1800 near the duct wall second end such that the duct wall second end is positioned substantially adjacent to the duct wall outer surface and the coupling strip first end is positioned outwardly beyond the duct wall second end. [0007] Preferably, the joiner sleeve is foldable through about 1800 such that the joiner sleeve first end is positioned outwardly beyond the duct wall second end. [0008] Preferably, the one or more connector regions comprise one or more eyelets. [0009] Preferably, the coupling strip first end comprises a hem formed thereon. [0010] Preferably, the duct wall is formed from a flexible plastics material. [0011] Preferably, the joiner sleeve is formed from a flexible plastics material. [0012] Preferably, the coupling strip is formed from a flexible plastics material.
3 [0013] Preferably, the duct wall has a diameter ranging between 200 mm to 2000 mm. [0014] Preferably, the joiner sleeve is sewn between the duct wall inner surface and the coupling strip. [0015] Preferably, the joiner sleeve is fixed between the duct wall inner surface and the coupling strip by thermally welded seams. [0016] A second aspect of the present invention provides a hollow ventilation duct segment comprising: a duct wall having a first end, a second end, an inner surface and an outer surface, the duct segment being folded through about 1800 near the duct wall second end such that the duct wall second end is substantially adjacent to the duct wall outer surface; a coupling strip having a first end and a second end, the coupling strip first end being positioned outwardly beyond the duct wall second end and having one or more connector regions at or substantially adjacent thereto, the coupling strip second end being substantially adjacent to the duct wall second end; and a joiner sleeve having a first end and a second end, the joiner sleeve being folded through about 1800 such that the joiner sleeve first end is positioned outwardly beyond the duct wall second end, the joiner sleeve second end being substantially adjacent to the duct wall second end, the joiner sleeve being fixed between the duct wall second end and the coupling strip. [0017] A third aspect of the present invention provides a hollow ventilation duct segment comprising: a duct wall having a first end, a second end, an inner surface and an outer surface; a coupling strip having a first end and a second end, the coupling strip first end being longitudinally positioned substantially between the duct wall first end and the duct wall second end and having one or more connector regions at or substantially adjacent thereto, the coupling strip second end being substantially adjacent to the duct wall second end; and a joiner sleeve having a first end and a second end, the joiner sleeve first end being longitudinally positioned between the duct wall first end and the coupling strip first end, the joiner sleeve second end being substantially adjacent to the duct wall second end, the joiner sleeve being fixed between the duct wall inner surface and the coupling strip, 4 wherein, prior to installation of the duct segment, the duct segment is folded through 1800 near the duct wall second end such that the duct wall second end is positioned substantially adjacent to the duct wall outer surface and the coupling strip first end is positioned outwardly beyond the duct wall second end, and wherein, after the duct segment is folded, the joiner sleeve is folded through 1800 such that the joiner sleeve first end is positioned outwardly beyond the duct wall second end. [0018] A fourth aspect of the present invention provides a method of forming a hollow ventilation duct segment comprising: forming a duct wall from a first sheet of material, the duct wall having a first end, a second end, an inner surface and an outer surface; forming a joiner sleeve from a second sheet of material, the joiner sleeve having a first end and a second end; forming a coupling strip from a third sheet of material, the coupling strip having a first end and a second end; longitudinally positioning the coupling strip first end between the duct wall first end and the duct wall second end and longitudinally positioning the coupling strip second end substantially adjacent the duct wall second end; longitudinally positioning the joiner sleeve first end between the duct wall first end and the coupling strip first end and longitudinally positioning the joiner sleeve second end substantially adjacent to the duct wall second end; and fixing the joiner sleeve between the duct wall inner surface and the coupling strip. [0019] Preferably, the method further comprises folding the duct segment through 1800 near the duct wall second end such that the duct wall second end is positioned substantially adjacent to the duct wall outer surface and the coupling strip first end is positioned outwardly beyond the duct wall second end. Brief Description of the Drawings [0020] A preferred embodiment of the invention will be described hereinafter, by way of an example only, with reference to the accompanying drawings, in which: [0021] Figure 1 is a cross-sectional side view of an embodiment of a hollow ventilation duct segment prior to construction; 5 [0022] Figure 2 is a cross-sectional side view of the duct segment of Figure 1 showing the coupling strip and the joiner sleeve fixed to the duct wall. [0023] Figure 3 is a cross-sectional side view of the duct segment of Figure 2 in a folded configuration ready for packaging and transportation. [0024] Figure 4 is a cross-sectional side view of the duct segment of Figure 2 in a configuration ready for installation. [0025] Figure 5 is a cross-sectional side view of two duct segments interconnected at their respective ends. Description of a Preferred Embodiment [0026] Figure 1 shows an embodiment of a hollow ventilation duct segment 10 prior to construction. The duct segment 10 comprises a duct wall 11 having a first end 12, a second end 13, an inner surface 14 and an outer surface 15. The duct wall 11 is formed from a flexible plastics material and, when expanded in use, is generally circular in cross-section and has a diameter ranging from 200 mm to 2000 mm. The duct segment 10 also comprises a coupling strip 16 located within the duct wall 11. The coupling strip 16 is formed from a flexible plastics material. The coupling strip 16 has a first end 17 and a second end 18. The coupling strip first end 17 is longitudinally positioned between the duct wall first end 12 and the duct wall second end 13. A hem 19 is formed at the coupling strip first end 17. Multiple connector regions (not shown), in the form of eyelets, are located along the hem 19 to facilitate coupling of adjacent duct segments together. The coupling strip second end 18 is adjacent to the duct wall second end 18. [0027] The duct segment 10 further comprises ajoiner sleeve 20 located between the duct wall inner surface 14 and the coupling strip 16. The joiner sleeve is formed from a flexible plastics material. The joiner sleeve 20 has a first end 21 and a second end 22. The joiner sleeve first end 21 is longitudinally positioned between the duct wall first end 12 and the coupling strip first end 17. The joiner sleeve second end 22 is adjacent to the duct wall second end 13. The duct segment 10 can be of a length ranging from 5 to 100 metres.
6 [0028] Figure 2 shows the joiner sleeve 20 being sewn between the duct wall inner surface 14 and the coupling strip 16 at predetermined locations A, B. The joiner sleeve 20 can also be fixed between the duct wall inner surface 14 and the coupling strip 16 by thermally welded seams (not shown). [0029] Figure 3 shows the duct segment 10 in a storage and transport configuration. The duct segment 10 is folded through 1800 near the duct wall second end 13 such that the duct wall second end 13 is positioned adjacent to the duct wall outer surface 15. The coupling strip first end 17 is also positioned outwardly beyond the duct wall second end 13 and the joiner sleeve first end 21 remains within the duct wall 11. [0030] The installation of the duct segment 10 will now be described. As best shown in Figure 4, the joiner sleeve 20 is folded through 1800, to a use configuration, in which the joiner sleeve first end 21 is positioned outwardly beyond the duct wall second end 13. [0031] Figure 5 shows two duct segments 10, 10' joined together at their respective ends. The joiner sleeve first end 21 of the upstream duct segment 10 is received within the duct wall 11' of an adjacent downstream duct segment 10'. The joiner sleeve 20' of the downstream duct segment 10' remains within the duct wall 11' and sandwiched between the joiner sleeve 20 of the upstream duct segment 10 and the duct wall 11' of the downstream duct segment 10'. The coupling strips 16, 16' of the duct segments 10, 10' are then laced, wired, cable-tied or otherwise interconnected via the eyelets (not shown) as required. [0032] The duct segment 10 described above has numerous advantages. Firstly, the duct segment 10 does not create an inwardly directed shoulder of the joiner sleeve 20 or result in any internal joint obstructions that directly face the air flow, which therefore reduces internal air resistance at the end of the duct segment 10. This increases the energy efficiency of the ventilation ducting (which can be up to 2000 kilometres in overall length) and thus improves airflow to desired locations in the mines. For example, standard ventilation ducting and joint leakage tests conducted for the duct segment 10 have shown improvements in friction factors and leakage coefficients compared to known ducting systems. The results show that the friction factor of the duct segment 10 gave an average calculated value of 0.00283 Ns2/m 4 . The results also show an improved leakage coefficient of 0.383 m 3 /s/lkm @ standardised 100 Pa fan pressure compared to known fabric ducting systems.
7 [0033] Secondly, the duct segment 10 is relatively easy to manufacture, thus reducing manufacturing costs. [0034] Thirdly, installation of the duct segments 10 is similar to known duct segments and thus does not require additional or specialised training. [0035] Although the invention has been described with reference to a preferred embodiment, it will be appreciated by persons skilled in the art that the invention may be embodied in many other forms. For example, the duct segment can have the coupling strip and the joining sleeve on both ends, making it bi-directional, or on only one end, making it uni-directional. In the latter case, the duct segment may include an indicator of air flow direction.
Claims (15)
1. A hollow ventilation duct segment, comprising: a duct wall having a first end, a second end, an inner surface and an outer surface; a coupling strip having a first end and a second end, the coupling strip first end being longitudinally positioned substantially between the duct wall first end and the duct wall second end and having one or more connector regions at or substantially adjacent thereto, the coupling strip second end being substantially adjacent to the duct wall second end; and a joiner sleeve having a first end and a second end, the joiner sleeve first end being longitudinally positioned between the duct wall first end and the coupling strip first end, the joiner sleeve second end being substantially adjacent to the duct wall second end, the joiner sleeve being fixed between the duct wall inner surface and the coupling strip.
2. The duct segment according to claim 1, wherein the duct segment is foldable through about 1800 near the duct wall second end such that the duct wall second end is positioned substantially adjacent to the duct wall outer surface and the coupling strip first end is positioned outwardly beyond the duct wall second end.
3. The duct segment according to claim 2, wherein the joiner sleeve is foldable through about 1800 such that the joiner sleeve first end is positioned outwardly beyond the duct wall second end.
4. A hollow ventilation duct segment, comprising: a duct wall having a first end, a second end, an inner surface and an outer surface, the duct segment being folded through about 1800 near the duct wall second end such that the duct wall second end is substantially adjacent to the duct wall outer surface; a coupling strip having a first end and a second end, the coupling strip first end being positioned outwardly beyond the duct wall second end and having one or more connector regions at or substantially adjacent thereto, the coupling strip second end being substantially adjacent to the duct wall second end; and a joiner sleeve having a first end and a second end, the joiner sleeve being folded through about 1800 such that the joiner sleeve first end is positioned outwardly beyond the duct wall second end, the joiner sleeve second end being substantially adjacent to the duct wall second end, the joiner sleeve being fixed between the duct wall second end and the coupling strip. 9
5. A hollow ventilation duct segment, comprising: a duct wall having a first end, a second end, an inner surface and an outer surface; a coupling strip having a first end and a second end, the coupling strip first end being longitudinally positioned substantially between the duct wall first end and the duct wall second end and having one or more connector regions at or substantially adjacent thereto, the coupling strip second end being substantially adjacent to the duct wall second end; and a joiner sleeve having a first end and a second end, the joiner sleeve first end being longitudinally positioned between the duct wall first end and the coupling strip first end, the joiner sleeve second end being substantially adjacent to the duct wall second end, the joiner sleeve being fixed between the duct wall inner surface and the coupling strip, wherein, prior to installation of the duct segment, the duct segment is folded through 1800 near the duct wall second end such that the duct wall second end is positioned substantially adjacent to the duct wall outer surface and the coupling strip first end is positioned outwardly beyond the duct wall second end, and wherein, after the duct segment is folded, the joiner sleeve is folded through 1800 such that the joiner sleeve first end is positioned outwardly beyond the duct wall second end.
6. The duct segment according to any one of the preceding claims, wherein the one or more connector regions comprise one or more eyelets.
7. The duct segment according to any one of the preceding claims, wherein the coupling strip first end comprises a hem formed thereon.
8. The duct segment according to any one of the preceding claims, wherein the duct wall is formed from a flexible plastics material.
9. The duct segment according to any one of the preceding claims, wherein the joiner sleeve is formed from a flexible plastics material.
10. The duct segment according to any one of the preceding claims, wherein the coupling strip is formed from a flexible plastics material.
11. The duct segment according to any one of the preceding claims, wherein the duct wall has a diameter ranging between 200 mm to 2000 mm. 10
12. The duct segment according to any one of the preceding claims, wherein the joiner sleeve is sewn between the duct wall inner surface and the coupling strip.
13. The duct segment according to any one of claims 1 to 11, wherein the joiner sleeve is fixed between the duct wall inner surface and the coupling strip by thermally welded seams.
14. A method of forming a hollow ventilation duct segment, comprising: forming a duct wall from a first sheet of material, the duct wall having a first end, a second end, an inner surface and an outer surface; forming a joiner sleeve from a second sheet of material, the joiner sleeve having a first end and a second end; forming a coupling strip from a third sheet of material, the coupling strip having a first end and a second end; longitudinally positioning the coupling strip first end between the duct wall first end and the duct wall second end and longitudinally positioning the coupling strip second end substantially adjacent the duct wall second end; longitudinally positioning the joiner sleeve first end between the duct wall first end and the coupling strip first end and longitudinally positioning the joiner sleeve second end substantially adjacent to the duct wall second end; and fixing the joiner sleeve between the duct wall inner surface and the coupling strip.
15. The method according to claim 14, further comprising folding the duct segment through 1800 near the duct wall second end such that the duct wall second end is positioned substantially adjacent to the duct wall outer surface and the coupling strip first end is positioned outwardly beyond the duct wall second end. AC Industries Pty Ltd Patent Attorneys for the Applicant SPRUSON & FERGUSON
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2015249033A AU2015249033B2 (en) | 2014-10-28 | 2015-10-27 | A hollow ventilation duct segment and method of forming the same |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2014904303 | 2014-10-28 | ||
| AU2014904303A AU2014904303A0 (en) | 2014-10-28 | A hollow ventilation duct segment and method of forming the same | |
| AU2015249033A AU2015249033B2 (en) | 2014-10-28 | 2015-10-27 | A hollow ventilation duct segment and method of forming the same |
Publications (2)
| Publication Number | Publication Date |
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| AU2015249033A1 true AU2015249033A1 (en) | 2016-05-12 |
| AU2015249033B2 AU2015249033B2 (en) | 2020-11-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| AU2015249033A Active AU2015249033B2 (en) | 2014-10-28 | 2015-10-27 | A hollow ventilation duct segment and method of forming the same |
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| AU (1) | AU2015249033B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106958704A (en) * | 2017-05-13 | 2017-07-18 | 昆山斯莱姆节能科技有限公司 | A kind of novel multi-effect exterior wall blast pipe and its application method |
| CN106979388A (en) * | 2017-05-13 | 2017-07-25 | 昆山斯莱姆节能科技有限公司 | A kind of exterior wall blast pipe and its application method |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU1415076A (en) * | 1975-05-20 | 1977-11-24 | Ruonala M J | A collar to improve seal at joints of underground air ductin |
| AU689540B2 (en) * | 1994-04-12 | 1998-04-02 | Acme Group Pty Ltd | Ventilation ducting |
| US6425608B1 (en) * | 2000-11-21 | 2002-07-30 | Nordstroem Lars-Ingvar | Joint at ventillating ducts |
| US9752706B2 (en) * | 2012-09-07 | 2017-09-05 | Famous Industries, Inc. | Sealed transverse locking pipe and fittings |
-
2015
- 2015-10-27 AU AU2015249033A patent/AU2015249033B2/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106958704A (en) * | 2017-05-13 | 2017-07-18 | 昆山斯莱姆节能科技有限公司 | A kind of novel multi-effect exterior wall blast pipe and its application method |
| CN106979388A (en) * | 2017-05-13 | 2017-07-25 | 昆山斯莱姆节能科技有限公司 | A kind of exterior wall blast pipe and its application method |
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| Publication number | Publication date |
|---|---|
| AU2015249033B2 (en) | 2020-11-05 |
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