AU2018100107A4

AU2018100107A4 - A circular column formwork system and method of utilisation thereof

Info

Publication number: AU2018100107A4
Application number: AU2018100107A
Authority: AU
Inventors: Lianyu Zhang
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-01-25
Filing date: 2018-01-25
Publication date: 2018-03-01
Anticipated expiration: 2026-01-25

Abstract

Abstract There is provided herein circular column formwork system and method of utilisation thereof comprising a plurality of wooden panels which strap together for the formation of an interior cylindrical mould for the pouring of concrete therein for the formation of concrete columns. The present wooden panels are lightweight yet while exhibiting high-strength properties thereby assisting in the transportation, installation and dismantling thereof. 101 mm101 Figure 1

Description

A circular column formwork system and method of utilisation thereof

Field of the Invention [1] This invention relates generally to concrete formwork. More particularly, this invention relates to a circular column formwork system and method of utilisation thereof.

Background of the Invention [2] Formwork for the formation of columns may comprise a plurality of formed steel mould sections which may be bolted together for forming a cylindrical concrete mould for the pouring of concrete therein.

[3] However, such systems are heavy and inconvenient to install and transport and introduce delays in the installation and dismantling thereof.

[4] The present invention seeks to provide a circular column formwork system and method of utilisation thereof, which will overcome or substantially ameliorate at least some of the deficiencies of the prior art, or to at least provide an alternative.

[5] It is to be understood that, if any prior art information is referred to herein, such reference does not constitute an admission that the information forms part of the common general knowledge in the art, in Australia or any other country.

Summary of the Disclosure [6] There is provided herein a lightweight, high-strength circular column formwork system and method of utilisation thereof which is easier to transport, install and dismantle as compared to certain prior art circular column formwork arrangements.

[7] Specifically, the present formwork system comprises a plurality of semicircular wooden panels which are strapped together and stacked to form a substantially water tight cylindrical concrete mould.

[8] The wooden panels are lightweight and therefore easy to transport, install and dismantle.

[9] Furthermore, the wooden panels are high strength, exhibiting a maximum bearing force of in excess of 20 kN/m2 and bending strength of approximately 50 MPa in embodiments.

[10] In embodiments, the wooden panels are manufactured from layers of fine poplar sheets curved by hot press and bound utilising WBP glue and layered with a water repellent film.

[11] As such, the wooden panels are very smooth, providing a superior concrete finish. Furthermore, utilisation of a release agent increases the number of times the wooden panels may be reused, such as by up to 8 times or more.

[12] Lateral edges of the wooden panels may comprise a tongue and groove interlock which seals the panels together when under compression of the strapping and furthermore holds the edges of the wooden panels in exact alignment, thereby preventing imperfections in the concrete surface finish.

[13] In embodiments, for columns in excess of 3 m in height, the wooden panels of two differing heights may be provided which are ultimately staggered to increase the strength of the system.

[14] Other aspects of the invention are also disclosed.

Brief Description of the Drawings [15] Notwithstanding any other forms which may fall within the scope of the present invention, preferred embodiments of the disclosure will now be described, by way of example only, with reference to the accompanying drawings in which: [16] Figure 1 shows a circular column formwork system in accordance with an embodiment; [17] Figure 2 shows interlocking of adjacent edges of the wooden panels of the formwork system in accordance with an embodiment; [18] Figure 3 shows a top view of the formwork system in accordance with an embodiment; and [19] Figure 4 shows the alternate staggering of wooden panels of differing heights together for the formation of a column in excess of a certain height, such as 3 m, in accordance with an embodiment.

Description of Embodiments [20] Figure 1 shows a circular column formwork system 100 comprising a plurality of wooden panels 101 each having a semicircular cross-section which are strapped together utilising strapping to form an interior cylindrical profile for the formation of concrete columns.

[21] Figure 3 shows a top plan view of the system 100 showing the interior cylindrical profile thereof.

[22] Each panel 101 may define top, bottom and lateral edges. In this regard, Figure 2 illustrates the lateral edges of the panels 101 defining a tongue and groove (or similar) interlock which seals the panels 101 together under compression of the belts 102. Furthermore, the tongue and grooves hold the lateral edges of the panels 102 in exact alignment, thereby preventing inconsistencies in the concrete finish.

[23] In an embodiment, the wooden panels 101 may be manufactured from layers of fine poplar sheets which are curved by hot press and bound utilising Water Boiled Proof (WBP) glue. Surfaces thereof may be coated with a water repellent.

[24] The wooden panels 102 may be provided in differing dimensions and thicknesses for the formation of differing types of columns. In embodiments, the wooden panels 101 may be provided comprising the following dimensions and number of components:

[25] The wooden panels exhibit high-strength properties for which the following exemplary test results are provided:

[26] In embodiments, the strapping 102 may comprise high-strength steel belts fastened together utilising bolts which, in one embodiment, may comprise steel belts and bolts according to the following specifications:

[27] The panels 101 may be reusable a number of times depending on the grade of finish and utilisation of a release agent as follows:

[28] Safe concrete poor rates and filling heights may depend on the inner diameters of the wooden panels 101 as follows:

[29] In embodiments, the strapping 102 may be installed according to the following guidance wherein belts spacing increases with elevation:

[30] The method of concrete column formation may comprise erecting a reinforcement bar cage structure and joining a plurality of the semicircular cross-section wooden panels 101 around the reinforcement bar structure to form an interior cylindrical mould thereabout.

[31] Interior surfaces of the wooden panels 101 may be coated with a release agent.

[32] Thereafter, the wooden panels 101 are secured together utilising the strapping. Given the exemplary embodiments shown in figure 1, an initial bottom strap 102 may be installed. Preferably, a 5 to 10 mm spacer is located thereunderneath to ease the dismantling thereof.

[33] Thereafter, additional strapping 102 may be installed, including in accordance with the above belts spacing guidance.

[34] Specifically, for the first approximately 1.5 m in elevation, strapping 102 may be provided at 200 mm intervals. Thereafter, and up to approximately 4 m in elevation, the strapping 102 may be spaced at 300 mm intervals. Thereafter, and up to approximately 7 m in elevation, the strapping 102 may be fastened every 400 mm.

[35] As alluded to above, the strapping 102 forces the edges of the wooden panels 101 together such that the tongue and groove mechanical interlock seals the edges thereof in a substantially water tight manner.

[36] For columns in excess of approximately 3 m, it is preferred that wooden panels 101 of differing height be utilised in alternatively staggered arrangement as a substantially shown in Figure 4.

[37] Specifically, Figure 4 illustrates the formation of a 4m high column. As can be seen, the wooden panels 101 comprise two types of wooden panels 101 of differing heights comprising a wooden panel of approximately 3 m in height and a second panel of approximately 1 m in height.

[38] The two lowermost panels comprise the adjoinment of 3 m and 1 m high wooden panels 101 such that a corresponding pair of 1 m and 3 m high wooden panels may be located thereatop alternately so as to constitute a cylinder of 4 m in elevation.

[39] Alternatively, for columns of less than approximately 3 m in elevation, a single type of wooden panel 101 may be employed.

[40] Thereafter, concrete may be poured within the cylindrical mould formed by the wooden panels 101, including in accordance with the above pouring guidance. Ideally, the concrete is vibrated simultaneously.

[41] For example, for columns having an interior diameter of between approximately 250 and 1200 mm, concrete is ideally poured to a maximum height of approximately 3.2 m and allowed to set prior to the additional pouring of further concrete thereatop.

[42] For columns having greater diameter such as, for example, between 1600 and 2400 mm, the concrete is ideally poured at less than 3 m per hour to a maximum height of approximately 3 m.

[43] Once the concrete has set, the strapping 102 is unbound and the panels 101 removed, leaving the formed concrete column in place.

[44] The foregoing description, for purposes of explanation, used specific nomenclature to provide a thorough understanding of the invention. However, it will be apparent to one skilled in the art that specific details are not required in order to practice the invention. Thus, the foregoing descriptions of specific embodiments of the invention are presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the invention to the precise forms disclosed; obviously, many modifications and variations are possible in view of the above teachings. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, they thereby enable others skilled in the art to best utilize the invention and various embodiments with various modifications as are suited to the particular use contemplated. It is intended that the following claims and their equivalents define the scope of the invention.

Claims

Claims

1. A method of concrete column formation comprising: erecting a reinforcement bar structure; joining a plurality of semicircular cross-section wooden panels around the reinforcement bar structure to form an interior cylindrical mould; securing the wooden panels utilising strapping; pouring concrete into the interior cylindrical mould; allowing the concrete to set; and removing the wooden panels and strapping.
2. A method as claimed in claim 1, wherein the wooden panels comprises wooden panels of two differing heights and wherein the method comprises vertically staggering the wooden panels of two differing heights.
3. A method as claimed in claim 1, wherein each wooden panel defines lateral edges and wherein respective lateral edges of adjacent wooden panels interlock in an operably fluid tight manner.
4. A method as claimed in claim 1, wherein the method comprises spacing the strapping by a first spacing for a first lower section of the column and spacing the belts by a second spacing for a second higher section of the column and wherein the second spacing is greater than the first spacing.
5. A method as claimed in claim 1, wherein the method comprises at least one of: for columns having an interior diameter of between approximately 250 and 120 mm, pouring concrete to a maximum height of approximately 3.2 m for setting; and for columns having a diameter of between approximately 1600 and 2400 mm, at least one of pouring concrete at less than approximately 3 m per hour and pouring the concrete to a maximum height of approximately 3 m for setting.