US3294357A - Formwork for concrete - Google Patents

Formwork for concrete Download PDF

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Publication number
US3294357A
US3294357A US403517A US40351764A US3294357A US 3294357 A US3294357 A US 3294357A US 403517 A US403517 A US 403517A US 40351764 A US40351764 A US 40351764A US 3294357 A US3294357 A US 3294357A
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United States
Prior art keywords
beams
panels
formwork
slab
props
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.)
Expired - Lifetime
Application number
US403517A
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English (en)
Inventor
Tooley Jack Raymond
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Acrow Engineers Ltd
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Acrow Engineers Ltd
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Filing date
Publication date
Application filed by Acrow Engineers Ltd filed Critical Acrow Engineers Ltd
Application granted granted Critical
Publication of US3294357A publication Critical patent/US3294357A/en
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    • 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
    • E04G11/00—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs
    • E04G11/36—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs for floors, ceilings, or roofs of plane or curved surfaces end formpanels for floor shutterings
    • E04G11/38—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs for floors, ceilings, or roofs of plane or curved surfaces end formpanels for floor shutterings for plane ceilings of concrete
    • 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
    • E04G11/00—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs
    • E04G11/36—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs for floors, ceilings, or roofs of plane or curved surfaces end formpanels for floor shutterings
    • E04G11/48—Supporting structures for shutterings or frames for floors or roofs
    • E04G11/50—Girders, beams, or the like as supporting members for forms
    • 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
    • E04G11/00—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs
    • E04G11/36—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs for floors, ceilings, or roofs of plane or curved surfaces end formpanels for floor shutterings
    • E04G11/48—Supporting structures for shutterings or frames for floors or roofs
    • E04G11/50—Girders, beams, or the like as supporting members for forms
    • E04G11/52—Girders, beams, or the like as supporting members for forms of several units arranged one after another
    • 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
    • E04G25/00—Shores or struts; Chocks
    • E04G25/04—Shores or struts; Chocks telescopic
    • E04G25/06—Shores or struts; Chocks telescopic with parts held together by positive means
    • E04G25/065—Shores or struts; Chocks telescopic with parts held together by positive means by a threaded nut

Definitions

  • This invention relates to formwork for use in the construction of horizontal concrete slabs such as floors and which. will be referred to herein as slab formwork.
  • the forms In the construction of such concrete slabs, it is usual for the forms to be in the form of rectangular panels supported from below so that they cannot be removed without depriving the slab cast on them of the whole of its support. As the slab may require some support while the concrete is maturing over a period which can be as long as 21 days, the panels cannot be struck and re-used for another part of the slab except when it is a question of a slab of enormous area, i.e. one which takes more than 21 days to cast.
  • the invention is concerned with enabling slab formwork to be used with the utmost economy and, more specifically, with constituting the formwork so that panel forms can be removed at an early stage without depriving the slab of the support given by other parts of the formwork.
  • the panels can be removed at an early stage after completion of the casting without removing the beams which, by themselves, provide sufiicient support for the slab during its maturing period.
  • the beams and the props are preferably provided with means such as interengaging pins and holes to ensure positive location of the beams.
  • the beams are preferably rolled steel I-section joists the Webs of which are provided with brackets for supporting the panel supporting means, the latter being preferably in the form of tubes provided with brackets which can be pivotally connected to the brackets on the beams so that when the panels are to be struck, the supporting tubes can be swung down while the panels are temporarily supported and be removed from the beams while they are out of contact with the panels.
  • FIGURE 1 is a diagrammatic perspective view from above of the formwork in the working position
  • FIGURE 2 is a perspective view from below on a larger scale of part of the formwork shown in FIGURE 1;
  • FIGURE 3 is a perspective view on an intermediate scale illustrating the use of the formwork.
  • FIGURE 4 is a perspective view on a still larger scale of details of the formwork.
  • the formwork is made up of adjustable props arranged in rows, beams 12 supported directly by the props and forms 14 in the form of rectangular panels supported by the beams 12 through supporting members 16.
  • the panels can be constructed in various ways. For use in accordance with the invention they will generally consist of a metal framework supporting a timber panel. As their manner of construction is of no importance in relation to the invention, they have Patented Dec. 27, I966 "ice been shown completely diagrammatically in the drawings.
  • the beams 12 are of the same length as the panels 14 and two end-to-end beams are supported by one and the same prop.
  • the beams are positively located by the engagement of pins 18 (FIGURE 2) depending from the beams in holes in the cap plates 20 of the props or viceversa. They are in the form of I-section rolled steel joists.
  • the panels 14 are disposed in the spaces between the beams so that their top surfaces are level with the top surfaces of the beam and form therewith a continuous surface onto which a concrete slab can be cast.
  • the panels rest on top of the beams, the latter not providing any of the casting surface.
  • the panels can be removed only with the beams or after the latter have been removed. With the construction shown here, the panels can be removed whenever desired while leaving the beams in the slab supporting position.
  • the members 16 which support the panels in their working positions are in the form of tubes of the same length as the panels and the beams. They are provided at intervals along their length with brackets 22 from which extend pins 24 having their axes parallel to that of the tubes.
  • the webs of the beam are also provided with brackets 26 at the same spacing as the brackets 22 in which are formed holes 28 for receiving the pins 24.
  • a supporting member 16 When it is desired to support a panel in position, a supporting member 16 is pivotally connected to a beam 12 as shown on the left in FIGURE 4. The member 16 is then swung upwards into the position shown on the right in FIGURE 4. (The pins 24 are shown in FIGURE 4 to be engaged one from the right and one from the left. It is immaterial whether the engagement is left hand or right hand.) It is then locked in position by bolts 30 passing through holes 32 in the web of the beam and corresponding pairs of holes 34 in the tube. The same operation having been effected on the beam supported by the next row of props, a panel form can be lowered onto the two supporting members from above into the position shown in FIGURE 1.
  • the bolts 30 are removed and the supporting members are swung down into the position shown on the left in FIGURE 4. Thereupon, they can be removed by being moved axially to disengage the pins 24, this being possible without interference from the neighbouring supporting members.
  • the formwork panel can then be lowered leaving the beams in position.
  • the supporting members 16 are in quite short lengths and are easily handled by one man. The placing in position and removal of the panels is, therefore, a simple and light task.
  • the latter can be provided at intervals with projecting lugs 36 engaging in corresponding grooves 38 in the panels.
  • the props can be braced as is customary.
  • a system of slab formwork comprising a number of props, a number of beams supported directly by the props, a number of panels, and means pivotally mounted on the webs of the beams and supporting said panels in the working position with their casting faces level with the top surfaces of the beams and forming a continuous casting surface therewith, said means being swingable to a position in which the panels can be struck without striking the beams.
  • a system of slab formwork according to claim 1 in which the beams and the props are provided with interengaging means serving to locate the beams positively in their working position.
  • a system of slab formwork according to claim 1 which when a panel supporting means is pivotally swung downwards from the working position into an idle position the panel can be removed without interference from its neighbours.
  • a system of slab formwork according to claim 4 in which the beams are I-section joists, and the pivotally supporting means are brackets projecting from the webs of the joists and formed with holes to receive pins on the panel supporting means so that the latter can be swung into and out of their working positions about the axis of the pins and can be moved parallel to that axis for removal from the beams.
  • a system of slab formwork comprising a plurality of props arranged in rows, a plurality of beams having flanges at their tops directly supported by said props to form a plurality of lines with a space between neighbouring lines, a plurality of rectangular forms disposed in said spaces and providing a continuous casting surface with said flanges, and means pivotally mounted on the webs of said beams having an elevated working position in which they project into the inter-beam spaces and support said forms and a lowered position, said form supporting means and their attachment means being slidable lengthwise of said beams for detachment therefrom when in their lowered position.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)
US403517A 1963-10-16 1964-10-13 Formwork for concrete Expired - Lifetime US3294357A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB40885/63A GB1106621A (en) 1963-10-16 1963-10-16 Improvements in and relating to formwork for concrete

Publications (1)

Publication Number Publication Date
US3294357A true US3294357A (en) 1966-12-27

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ID=10417106

Family Applications (1)

Application Number Title Priority Date Filing Date
US403517A Expired - Lifetime US3294357A (en) 1963-10-16 1964-10-13 Formwork for concrete

Country Status (3)

Country Link
US (1) US3294357A (fr)
CH (1) CH414127A (fr)
GB (1) GB1106621A (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3614048A (en) * 1967-11-07 1971-10-19 Rapid Metal Developments Ltd Arrangements for use in the supporting of formwork for the casting of concrete slabs
US3917215A (en) * 1972-09-07 1975-11-04 Ronald Fox Form work for concrete construction
US4450120A (en) * 1980-09-26 1984-05-22 Josef Maier Concrete form and method of assembling and dismantling the same
US4527363A (en) * 1982-03-22 1985-07-09 Kolbjorn Saether Erecting precast horizontal slabs in building construction
WO2012174597A1 (fr) * 2011-06-22 2012-12-27 Form 700 Pty Ltd Améliorations apportées à un support de coffrage
EP4636197A1 (fr) * 2024-04-19 2025-10-22 Peri Se Poutre horizontale, dispositif et procédé de coffrage d'un plancher en béton

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5029421A (en) * 1989-09-18 1991-07-09 Speedy Gantry Hire Pty. Ltd. Modular gantry and structural element therefor

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US540851A (en) * 1895-06-11 Grain-door for cars
US3130470A (en) * 1961-01-24 1964-04-28 Symons Mfg Co Concrete wall form installation

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US540851A (en) * 1895-06-11 Grain-door for cars
US3130470A (en) * 1961-01-24 1964-04-28 Symons Mfg Co Concrete wall form installation

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3614048A (en) * 1967-11-07 1971-10-19 Rapid Metal Developments Ltd Arrangements for use in the supporting of formwork for the casting of concrete slabs
US3917215A (en) * 1972-09-07 1975-11-04 Ronald Fox Form work for concrete construction
US4450120A (en) * 1980-09-26 1984-05-22 Josef Maier Concrete form and method of assembling and dismantling the same
US4527363A (en) * 1982-03-22 1985-07-09 Kolbjorn Saether Erecting precast horizontal slabs in building construction
WO2012174597A1 (fr) * 2011-06-22 2012-12-27 Form 700 Pty Ltd Améliorations apportées à un support de coffrage
RU2570209C2 (ru) * 2011-06-22 2015-12-10 Форм 700 Пти Лтд Усовершенствования опоры опалубки
US9540830B2 (en) 2011-06-22 2017-01-10 Form 700 Pty Ltd Bracket assembly for securement to a formwork support for forming an elevated concrete slab
AU2012272537B2 (en) * 2011-06-22 2017-07-20 Form 700 Pty Ltd Formwork support improvements
EP4636197A1 (fr) * 2024-04-19 2025-10-22 Peri Se Poutre horizontale, dispositif et procédé de coffrage d'un plancher en béton

Also Published As

Publication number Publication date
GB1106621A (en) 1968-03-20
CH414127A (fr) 1966-05-31

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