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WO2002025026A1 - Ameliorations dans le domaine du coffrage - Google Patents

Ameliorations dans le domaine du coffrage Download PDF

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Publication number
WO2002025026A1
WO2002025026A1 PCT/GB2001/004221 GB0104221W WO0225026A1 WO 2002025026 A1 WO2002025026 A1 WO 2002025026A1 GB 0104221 W GB0104221 W GB 0104221W WO 0225026 A1 WO0225026 A1 WO 0225026A1
Authority
WO
WIPO (PCT)
Prior art keywords
shutter component
component
wall shutter
lower wall
self
Prior art date
Application number
PCT/GB2001/004221
Other languages
English (en)
Inventor
Edward Henry Clifford
Richard Francis Biss
Original Assignee
Ccp Associates Limited
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ccp Associates Limited filed Critical Ccp Associates Limited
Priority to AU2001290072A priority Critical patent/AU2001290072A1/en
Publication of WO2002025026A1 publication Critical patent/WO2002025026A1/fr

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Classifications

    • 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
    • E04G13/00—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D27/00—Foundations as substructures
    • E02D27/01—Flat foundations
    • E02D27/02—Flat foundations without substantial excavation
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
    • E04B5/16—Load-carrying floor structures wholly or partly cast or similarly formed in situ
    • E04B5/32—Floor structures wholly cast in situ with or without form units or reinforcements
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
    • E04B5/16—Load-carrying floor structures wholly or partly cast or similarly formed in situ
    • E04B5/32—Floor structures wholly cast in situ with or without form units or reinforcements
    • E04B2005/322—Floor structures wholly cast in situ with or without form units or reinforcements with permanent forms for the floor edges

Definitions

  • the present invention relates to self-supporting shuttering for the casting therein of a beam, which beam may be a beam for a foundation and more particularly an edge beam of a raft foundation.
  • FIG. 10 A prior art method of forming a mould for the casting therein of a concrete edge beam and slab of a raft foundation is shown schematically in Figure 10.
  • a trench 1 is dug into the ground and a timber board 2 is disposed vertically at a side of the trench 1.
  • the board requires the provision of supports (not shown) to prevent the board from toppling over under the action of the hydrostatic pressure of poured concrete.
  • a laterally facing mould surface 3 of the timber board forms a shutter wall 2.
  • This mould surface 3, and an upwardly facing surface 4 and a laterally facing surface 5 of the trench 1 itself, form a generally U-shaped mould for the casting therein of the edge beam 6, integrally with slab 8.
  • a sacrificial shutter 7 made of for example polystyrene or cardboard is attached to the top of the timber shutter wall on its inside mould surface 3. In this way, by removing the sacrificial shutter 7 after casting, an upwardly facing surface 9 on which a course of bricks can be laid may be formed at or below ground and/or floor level at the outer edge of the slab 8 above the edge beam 6.
  • a problem with this prior art shuttering method is that the shuttering is difficult to assemble, requiring carpentry skills, and requires the timber board to be properly supported if the board is not to topple over either before casting, due to back-filling of the trench 1 with excavated earth (i.e. positioning earth on the left hand side of the timber 2 as shown), or during casting due to the pressure of the poured concrete. Additionally, it is a building requirement to have a damp-proof membrane between the ground and the concrete on the side wall 3 of the mould formed by the timber shutter and on the base 4 of the trench. It is complicated to arrange a damp-proof membrane around the shutter component before pouring concrete into the mould when a sacrificial shutter component 7 such as the one for forming the upwardly facing surface 9 for laying thereon of bricks is used.
  • a system for assembly into a self-supporting shuttering for the casting thereagainst of a beam comprising a base shutter component, a lower wall shutter component and an upper wall shutter component, the lower wall shutter component being provided with first and second locating portions, the base shutter component being provided with a third locating portion and the upper wall shutter component being provided with a fourth locating portion, whereby the first and third locating portions are engageable to locate the lower wall shutter component on the base shutter component when the lower wall shutter component is assembled on the base shutter component and the second and fourth locating portions are engageable to locate the upper wall shutter component on the lower wall shutter component when the upper wall shutter component is assembled on the lower wall shutter component, whereby the assembled shutter components form the self-supporting shuttering and wherein the first and third locating portions are adapted, when engaged, to lock said lower wall shutter component to said base shutter component and to resist any tendencies, occasioned by the action of casting the beam, of the lower wall shutter component to pivot relative to the base shutter
  • the hereinafter described embodiment of the present invention allows shuttering to be easily assembled from dry components without the need for motar joints or to glue or nail the components of the shuttering together.
  • the components of the self-supporting shuttering can be carried to the site and assembled there without the need for mechanical lifting machinery. Also there is no need to attach additional sacrificial polystyrene shuttering to form an upwardly facing surface for bricks.
  • the shuttering components allow for easy attachment of a damp-proof membrane.
  • a self-supporting shuttering for the casting thereagainst of abeam, said self-supporting shuttering comprising: a lower wall shutter component provided with first and second locating portions; a base shutter component provided with a third locating portion; and an upper wall shutter component provided with a fourth locating portion; wherein said lower wall shutter component is located on said base shutter component by engagement of said first and third locating portions; and said upper wall shutter component is located on said lower wall shutter component by engagement of said second and fourth locating portions and wherein the engaged first and third locating portions lock said lower wall shutter component to said base shutter component and resist any tendencies, occasioned by the action of casting the beam, of the lower wall shutter component to pivot relative to the base shutter component about the line of their engaged locating portions and of the lower wall shutter component to move upwardly relative to the base shutter component.
  • a method of assembling a self-supporting shuttering for the casting thereagainst of a beam comprising the steps of: providing a lower wall shutter component with first and second locating portions; assembling said lower wall shutter component on a base shutter component by engaging said first locating portion with a third locating portion on said base component thereby to locate said lower wall shutter component on said base shutter component; and assembling an upper wall shutter component provided with a fourth locating portion on said lower shutter wall component by engaging said second locating portion with said fourth locating portion thereby to locate said upper wall shutter component on said lower wall shutter component; and wherein in the assembled shuttering the first and third locating portions lock said lower wall shutter component to said base shutter component and resist any tendencies, occasioned by the action of casting the beam, of the lower wall shutter component to pivot relative to the base shutter component about the line of their engaged locating portions and of the lower wall shutter component to move upwardly relative to the base shutter component.
  • Figure 1 is a schematic perspective view of a first embodiment of self- supporting shuttering and foundation according to the present invention
  • Figure 2 is a schematic longitudinal cross-section of the lower wall shutter component of Figure 1;
  • Figure 3 is a schematic longitudinal cross-section of the base shutter component of Figure 1;
  • Figure 4 is a schematic longitudinal cross-sectional view of the upper wall shutter component of Figure 1;
  • Figure 5 is a schematic longitudinal cross-section of a self-supporting shuttering and foundation according to the present invention
  • Figure 6 is a perspective view of a self-supporting shuttering according to the present invention
  • Figure 7 is a perspective view of a self-supporting shuttering according to the present invention.
  • Figure 8 is a schematic longitudinal cross-section of a lower wall shutter component of a second embodiment of the present invention.
  • Figure 9 is a schematic longitudinal cross-section of an upper wall shutter component of a second embodiment of the present invention.
  • Figure 10 is a schematic longitudinal cross-section through a prior art shuttering arrangement with a foundation cast therein.
  • the self-supporting shuttering of the first embodiment of the present invention is shown in Figure 1 can be assembled from three main shutter components which make up a system for assembly into a self-supporting shuttering for the casting therein of a concrete beam.
  • the three main components are a lower wall shutter component 10, a base shutter component 20 and an upper wall shutter component 30.
  • the lower wall shutter component 10 is provided with a first locating portion 12 and a second locating portion 14 to enable it to be located on the base shutter component 20 and to enable the upper wall shutter component 30 to be located on it respectively.
  • the base shutter component 20 is provided with a third locating portion 22,24 which is engageable with the first locating portion 12 and the upper wall shutter component 30 is provided with a fourth locating portion 32, 38, which is engageable with the first locating portion 14 of the lower wall shutter component 10.
  • the lower wall shutter component 10 on the base shutter component 20 with the first and third locating portions engaged the lower wall shutter component 10 can be locked to the base shutter component 20, as will be described below.
  • the upper wall shutter component 30 on the lower wall shutter component with the second and fourth locating portions engaged the upper wall shutter component 30 can be locked to the lower wall shutter component 10, as will be described below. In this way the shutter components can be assembled to form a self-supporting shuttering.
  • the upper wall shutter component may, as shown, be provided with supporting means 34 for supporting a top wall shutter component 40.
  • the supporting means take the form of a recess 34 in the upwardly facing surface 35 of the upper wall shutter component 30.
  • the top wall shutter component 40 is provided with means for co-operating with the supporting means.
  • these cooperating means take the form of the lower edge of the top wall shutter component 40.
  • the upper 30 and lower 10 wall shutter components and the base shutter component 20 are fabricated in concrete, or a polymer based concrete, whilst the top wall shutter component 40 is a metal or wooden sheet.
  • the top wall shutter component 40 is comprised of a corrugated metal sheet to increase its stiffness and thereby reduce the thickness, weight and cost of the metal sheet required.
  • the shutter components 10,20,30,40 when assembled the shutter components 10,20,30,40 form a generally L-shaped shuttering when viewed in longitudinal transverse cross-section.
  • the upwardly facing surface 35 of the upper wall shutter component 30 and the upwardly facing surface 16 of the lower wall shutter component 10 are elongate.
  • the width of the upwardly facing surface 35 of the upper wall shutter component 30 in a direction perpendicular to the elongate direction of that component is larger than the width of the upwardly facing surface 16 of the lower wall shutter component 10 in the same direction.
  • the upper wall shutter component 30 thus overhangs the lower wall shutter component 10 on both sides.
  • wet mortar is placed in the bottom of the trench so that a plurality of base shutter components 20, 120, 220 can be laid on the mortar in a substantially horizontal plane abutting each other end to end with their third locating portions generally aligned, as shown in Figure 1.
  • a plurality of lower wall shutter components 10, 110, 210 are then assembled onto the base shutter components to abut each other end to end and with their first locating portions engaging the third locating portions of the base shutter components, again as shown in Figure 1.
  • a plurality of upper wall shutter components 30, 130, 230 are assembled onto the lower wall shutter components 10,110,210 to abut each other end to end and with their fourth locating portions engaging the second locating portions of the lower wall shutter components. In this way a longitudinal run of self-supporting shuttering can be assembled.
  • the strength and stability of the self-supporting shuttering can be increased by staggering the joins of the layers of components, as shown.
  • the abutted pairs of ends 100 of the base shutter components 20, 120, 220 are arranged such that they do not vertically align with the abutted pairs of ends 115 of the lower wall shutter components 10, 110, 210.
  • the abutted pairs of ends 125 of the upper wall shutter components 30, 130, 230 are not vertically aligned with the abutted pairs of ends 115 of the lower shutter component 10, 110, 210.
  • This staggering of the joins has the effect of the upper wall shutter components and the base shutter components holding adjacent lower wall shutter components together, with a corresponding increase in strength and stability.
  • the abutted pairs of ends 100 of the base shutter components, 20, 120, 220 and the abutted pairs of ends 125 of the upper wall shutter components 30, 130, 230 are preferably aligned and the abutted pairs of ends 115 of the lower wall shutter components 10, 110, 210 are positioned approximately halfway along the length of the base shutter components 20, 120, 220 and the upper wall shutter components 30, 130, 230, as shown in Figure 1.
  • a laterally facing surface 70 of the trench, an upwardly facing surface 26 of the base component 20, a laterally facing surface 18 of the lower wall shutter component 10 and the laterally facing surface 36 of the upper wall shutter component 30 define a mould having a generally U-shaped cross-section.
  • the laterally facing surfaces 70, 18,36 are surfaces with at least some vertical component. Any residual trench space to the side of the lower wall shutter component 10 that is opposite to the laterally facing surface 70 may be back filled such that earth abuts the left hand side (as drawn) of the lower and upper wall shutter components 10, 20.
  • the locating portions are formed as locking portions to substantially prevent movement apart as well as relative sliding movement of the lower wall shutter component 10 to the base shutter component 20 and the upper wall shutter component 30 relative to the lower wall shutter component.
  • the first locating portion at one edge of the lower wall shutter component 10, comprises a triangular shaped lip-receiving recess 12 which runs adjacent the edge of the generally elongate slab shaped lower wall shutter component 10 on the moulding surface 18.
  • the third locating portion of the base shutter component 20, as shown in Figure 3, comprises a recess 22 in the moulding surface 26 of the base shutter component 20 running adjacent, but spaced apart from, an edge with a generally triangular shaped lip 24 protruding laterally into the recess 22.
  • the protrusion of the lip 24 into the recess causes the lip to overhang the base of the recess 22.
  • the top surface of the lip is flush with the moulding surface 26.
  • the first locating portion is placed into the recess 22 in a base shutter component 20 whilst an acute angle is maintained between moulding faces 18,26 of the lower wall shutter component 10 and the base shutter component 20.
  • the lower wall shutter component 10 is then pivoted around its first locating portion relative to the base shutter component 20 (in an anti-clockwise direction as drawn) to increase the angle between the moulding faces 18,26 and thereby to engage the lip 24 of the third locating portion in the lip-receiving recess 12 of the first locating portion 10.
  • the lower wall shutter component 10 is pivoted by an amount such that the moulding faces 18,26 of the lower wall shutter component 10 and of the base shutter component 20 end up substantially perpendicular to one another. It will however be appreciated that for a forming beam of other cross-sectional shapes, the moulding faces of these two components need not be substantially perpendicular to one another. In such an alternative arrangement, the geometry of the locating portions would require modification.
  • the engagement of the laterally protruding lip 24 in the lip-receiving recess 12 means that the lower wall shutter component 10 is locked to the base shutter component 20 to resist the tendency for lateral sliding movement, as well as upward movement, of the lower wall shutter component 10 relative to the base shutter component 20, as well as resist further pivoting of the lower wall shutter component 10 relative to the base shutter component 20 occasioned by the action of casting the beam.
  • hydrostatic forces can be quite high and the laterally protruding lip 24 engaging in the lip-receiving recess 12 resists the action of these forces.
  • the recess 22 in the base shutter component 20 may be made oversize, necessitating the insertion of a spacer element into the back of the recess 22 between the base shutter component 20 and the lower wall shutter component 10 on the side opposite the moulding surface 18 to help to jam the lower wall shutter component 10 into the recess 22 of the base shutter component 20.
  • These spacer elements may, for example, be wedges fabricated in wood, concrete or any other suitable material.
  • the second locating portion of the lower wall shutter component 10, as shown in Figure 2 comprises a laterally protruding lip 14 which extends beyond the moulding surface 18 of the lower wall shutter component 10 to overhang the base shutter component 20 and is of generally a triangular cross-section. In this way, the first and second locating portions are provided on opposite longitudinal elongate edges of the moulding surface 18 of the generally slab-shaped lower wall shutter component 10.
  • the fourth locating portion 32 of the upper wall shutter component is shown in Figure 4 and comprises a lip-receiving lateral recess 32 for receiving the laterally protruding lip 14 of the second locating portion.
  • the lip-receiving lateral recess 32 is formed in a portion of the upper wall shutter component 30 which, in use, overhangs the base shutter component 10 and extends down the moulding surface 18 of the lower wall shutter component 10.
  • a back lip 38 may, as shown, be provided as part of the fourth locating portion on the upper wall shutter component 30 to co-operate with the back surface of the lower wall shutter component, this back surface being the surface opposite to the moulding surface 18 when assembled.
  • the back lip 38 can help to lock the upper wall shutter component 30 to the lower wall shutter component 10 to prevent misalignment and sliding movement of the upper wall shutter component 30 relative to the lower wall shutter component 10.
  • the upper wall shutter component 30 may be assembled on the lower wall shutter component 10.
  • the optional back lip 38 is provided on the upper wall shutter component, as is illustrated in Figures 1 and 4, assembly is achieved by first orientating the upper wall shutter component 30 such that its moulding surface 36 is positioned to face the laterally facing wall 70 of the trench and the back lip 38 is close or in contact with the upwardly facing surface 16 of the lower wall shutter component.
  • the upper wall shutter component 30 is then moved relative to the lower wall shutter component in a direction away from the laterally facing wall 70 of the trench until the back lip 38 can engage behind the back surface of the lower wall shutter component 10. This happens by a pivoting action of the upper wall shutter component 30 around the lip receiving lateral recess 32 and lip 14.
  • the upper wall shutter component 30 may be assembled on the lower wall shutter component by being slid into place without the above-mentioned pivoting action.
  • the laterally protruding lip 14 and lip-receiving lateral recess When engaged, the laterally protruding lip 14 and lip-receiving lateral recess
  • the locating portion may be configured differently to those in the illustrated embodiments and still have the effect of holding the various shutter components together to enhance overall stability of the assembled shuttering.
  • the depth of the trench and the height of the main shutter components may be adjusted such that the upwardly facing surface 35 of the upper wall shutter component 30 is substantially level with or below the edge of the trench.
  • the outer bricks 90 of a building can start at or below the level of the ground which is aesthetically more appealing than having concrete visible above the level of the ground.
  • the top wall shutter component 40 is assembled onto the upper wall shutter component 30.
  • This arrangement allows a course of bricks to be laid below the level of the upwardly facing surface of the raft as well as at or below the edge of the trench.
  • the shutter wall components are preferably made both of a material and of a size such that the components of the self-supporting shuttering can be readily carried by one or two people and easily assembled without the need for special skills.
  • the weight of each component is advantageously under 50 kg, preferably less than 30 kg.
  • the components may be cut by an angle grinder.
  • the main shutter components 10,20,30 are all of the same length, for example 600 mm long in their an elongate direction (dimension 'X' in Figure 1).
  • the base shutter component may be 450 mm wide and 15 mm thick.
  • the lower wall shutter component may be 75 mm thick and 240 mm high.
  • the top wall shutter component may be 115 mm thick at its maximum thickness and 190 mm wide at its maximum width.
  • the upper wall shutter component 30 may extend the height of the shuttering by about 65 mm. It is envisaged that the main shutter components will all be at least 0.3 m long, that the base shutter component 20 will be at least 0.2 m wide and 0.01 thick, that the lower wall shutter component will be at least 0.3 m high and 0.01 m thick and that the maximum height of the upper wall shutter component will be at least 0.05 m and the maximum thickness will be at least 0J5 m. It will be appreciated that the components may readily be supplied in other sizes and or materials.
  • a beam 50 can be cast in the generally U-shaped mould integrally with the slab 60 of a raft foundation assembly.
  • the upwardly facing surface of the raft 60 may be used to form the floor of a building.
  • a further course of bricks (not shown) may be built on the edge of the slab 60, and the built up like course 90, to form a pair of parallel walls with a cavity therebetween.
  • a damp-proof membrane 80 (denoted by a dotted line) is placed along the entire surface of the generally U-shaped mould as well as along the ground onto which the slab 60 of the raft foundation is to be cast.
  • the damp-proof membrane may also extend beyond the top of the top wall shutter component 40 to lap with a damp-proof course which would be laid under the internal skin of the building as described below in conjunction with Figure 5.
  • An alternative arrangement to the one illustrated in Figure 1 is to damp- proof the shutter wall components by painting them with bituminous paint.
  • a damp proof membrane laid on top of the ground onto which slab 60 is to be cast is lapped to base shutter component 20.
  • This arrangement can also be used without applying bituminous paint to the main shutter components 10, 20, 30 if those components are made of a material which is substantially impermeable to water, for example a polymer based concrete.
  • FIG. 5 shows an embodiment of the invention in which several further features, which may be used together, individually or in any combination have been incorporated.
  • a lower wedge or lower wedges 210 can be driven into the recess 22 of the third locating portion on the opposite side to lip 24 and abutting the lower wall shutter component 10 to lock the first locating portion in the recess 22 of the third locating portion.
  • an upper wedge or upper wedges 220 can be driven between the back lip 38 of the fourth locating portion and the lower wall shutter component 10 thereby to assist in preventing relative movement between the upper and lower wall shutter components 10, 30 during casting of the beam.
  • a metal clip can also be used, if necessary, to improve the resistance of the assembled main components 10, 20, 30 to toppling over prior to the casting of the beam.
  • the clip 230 is of a generally U-shaped construction and, when attached to the assembled main components, engages the base shutter component on a face 28 which is on the other side of the base shutter component to the moulding surface 26 and the upwardly facing surface 35 of the upper wall shutter component 30. Conveniently the metal clip 230 can be removed after the casting of the beam and prior to back filling of earth against the shutter wall components. It is also possible to manufacture the lower wall shutter component 10 integrally with reinforcing members 250 protruding from the moulding surface 18 into the area into which the beam is to be cast.
  • these take the form of a plurality of closed loops of metal in spaced apart relationship to each other along the elongate direction of the lower wall shutter component 10.
  • any shape or configuration (eg spiral) of reinforcing members 250 can be utilised.
  • links 260 eg in the form of bars
  • supporting blocks 270 may be used to transfer the load of the reinforcing members 250 to the base shutter component 20 before casting of the beam to support the reinforcing members 250.
  • damp proofing of the shuttering may be achieved by applying liquid bituminous paint to the shutter components 10, 20, 30. This can either be applied at the manufacturing stage or after assembly of the shuttering.
  • the use of reinforcing elements 250 advantageously provides shear reinforcement between the precast shutter components and the final cast beam.
  • the raft 60 of the foundation may, as illustrated in Figure 5, also be reinforced by raft reinforcing members 280, 290 supported by reinforcing members 250. If the foundation is to be supported by piles, these are positioned under the base shutter component 20 in a position approximately as indicated by 300 in Figure 5. If the shuttering is supported by piles, the optimum position for the raft reinforcing members is lower (position 280) than the optimum position (position 290) for the case where the foundation is not supported by piles.
  • a course ofbricks 304, above ground level, built on top of the course of bricks 90 is separated from the course ofbricks 90 by a damp-proof membrane 3.
  • An inner course ofbricks 300 is built on a top surface of the raft 60 of the foundation.
  • the inner course ofbricks is also damp-proofed from the foundation by a sheet 305 which is lapped to the damp-proofing of the main shutter components, for example to the damp proof membrane 80.
  • the skilled person will recognise that there are several ways in which the shuttering can be arranged to accommodate changes in direction. Two examples are shown schematically in Figures 6 and 7.
  • Figure 6 shows how the direction of the shuttering might be changed through a small angle.
  • Standard base and lower wall shutter components 20, 10 (as described above in relation to Figures 1 to 4) can be used, albeit cut to shape.
  • two comer base shutter components 20' are cut along the moulding surface 26 and perpendicular thereto such that, when the cut ends of the two comer base shutter components 20' abut each other, their third locating portions lie at the desired angle to each other.
  • the ends of the comer lower wall shutter components 10' are cut to the desired angle (i.e. not perpendicular to the moulding surface 18) such that those cut ends abut each other when the comer lower wall shutter components 10' are assembled onto the comer base shutter components 20'.
  • the comer upper wall shutter component 30' is manufactured as a single component and is essentially in the shape of two upper wall shutter components joined together at an angle end to end. It comprises all of the features of the standard upper wall shutter component mentioned above except for one of either back lip 38 or recess 32, such that it can be assembled onto the two comer lower wall shutter components 20' without rotation. As in the embodiment shown in Figure 1, the main shutter components 10, 20, 30 are staggered in the longitudinal direction to improve strength. This is achieved by the choice of length of the comer shutter components 10', 20', 30'.
  • Figure 7 illustrates a further method of changing the direction of the shuttering.
  • the base shutter components 20 are all standard (i.e. as discussed in relation to Figures 1 to 4) and uncut. Two longitudinal runs of base shutter components 20 come together with their third locating portions at approximately 90° to each other.
  • the corner lower wall shutter component 10" is generally L-shaped with only the base of the L-shape provided with a first locking portion which engages with the third locking portion of one of the base shutter components 20.
  • the comer upper wall shutter component 30" is also generally L-shaped and is otherwise the same as comer upper wall shutter component 30'.
  • the size of the corner components are preferably chosen such that the main components are longitudinally staggered to increase the strength of the assembled shuttering.
  • Figures 8 and 9 respectively show a lower wall shutter component 410 and an upper wall shutter component 430 of a second embodiment of the present invention.
  • the lower and upper wall shutter components 410, 430 of the second embodiment may be used with a base shutter component 20 shown in Figure 3 of the first embodiment of the present invention.
  • the lower wall shutter component 410 of the second embodiment differs from the lower wall shutter component 10 of the first embodiment in three major ways.
  • the lower wall shutter component 410 of the second embodiment has a protruding lip 412 rather than a lip receiving recess 12.
  • the protruding lip 412 slots underneath the lip 24 of the third locating portion of the base wall shutter component 20.
  • the second difference is that the outer surface 417 which is opposite the moulding surface 418 is not parallel to the moulding surface 418. In fact the outer surface 417 is at an angle to the moulding surface 418 such that an overhang 419 is formed at the first locating portion of the lower wall shutter component 410 of the second embodiment.
  • the overhang 419 when the lower wall shutter component 410 is located on the base wall shutter component 20, engages with and rests on the moulding surface 26 of the base wall shutter component 20.
  • the downwardly facing surface of the first locating portion i.e. the lowest surface as illustrated in Figure 8
  • the outer surface 417 is in a single plane. This is not necessarily the case.
  • the outer surface 417 may be mainly parallel to the moulding surface 418 and the overhang 419 may only be formed at the first locating portion by protrusion of the outer surface 417 locally.
  • the third difference between the lower wall shutter component 410 of the second embodiment and that of the first embodiment is in the second locating portion.
  • an upwardly facing surface 416 is inclined at an angle (i.e. it is not perpendicular to the moulding surface 418 as is the case in the first embodiment).
  • the direction of slant is such that when the upwardly facing surface 416 comes into contact with the upper wall shutter component 430, a component of the force is in the direction towards where the beam is to be cast.
  • the angle of the upwardly facing surface 416 helps resist the tendency of the upper wall shutter component to pivot relative to the lower wall shutter component about the line of their engaged locating portions occasioned by the action of casting the beam.
  • the upper wall shutter component 430 illustrated in Figure 9 has a fourth locating portion adapted for use with the lower wall shutter component 410 illustrated in Figure 8.
  • the upper wall shutter component 430 of the second embodiment has a lateral recess 132 which is similar to the lateral recess 32 of the first embodiment.
  • the upper wall shutter component 430 of the second embodiment also has a back lip 438 similar to the one illustrated as optional in Figure 4.
  • One of the major differences is that the wall 433 between the lateral recess 132 and the back lip 438 is at an angle which corresponds with the angle of the upwardly facing surface 416 of the lower wall shutter component 410. As stated above, this angle ensures that a component of the force between the upper and lower shutter wall components is in the direction towards where the beam is to be cast and will help in resisting the tendency to pivot caused by the action of casting the beam.
  • the upper wall shutter component 430 of the second embodiment is also designed for easy moulding of the upper wall shutter component 430 itself. This is achieved by providing side walls 435 and 437 inclined towards one another rather than parallel to one another as is illustrated in Figure 4. These inclined surfaces aid in the extraction of the upper wall shutter component 430 after casting in a mould.
  • the side wall 435 which forms part of the moulding surface against which a beam is cast, may be inclined in the opposite direction to that illustrated in Figure 9. Such an inclination results in a downwards force being exerted on the upper wall shutter component 430 when cement is cast against the assembled shuttering. Such a downwards force helps to resist the tendency of the upper wall shutter component 430 to float off the lower wall shutter component.

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  • Moulds, Cores, Or Mandrels (AREA)

Abstract

La présente invention concerne un système d'assemblage en un coffrage autonome destiné au coulage d'une poutre. Ce système comprend un élément (20) de coffrage de base, un élément (10) de coffrage de paroi inférieure et un élément (30) de coffrage de paroi supérieure. L'élément (10) de coffrage de paroi inférieure est doté d'une première et d'une deuxième partie de positionnement, l'élément (20) de coffrage de base est doté d'une troisième partie de positionnement et l'élément (30) de coffrage de paroi supérieure est doté d'une quatrième partie de positionnement. La première et la troisième partie de positionnement peuvent s'emboîter de façon à verrouiller l'élément (10) de coffrage de paroi inférieure sur l'élément (20) de coffrage de base lorsque l'élément (10) de coffrage de paroi inférieure est assemblé sur l'élément (20) de coffrage de base. La deuxième et la quatrième partie de positionnement peuvent s'emboîter de façon à verrouiller l'élément (30) de coffrage de paroi supérieure sur l'élément (10) de coffrage de paroi inférieure lorsque l'élément (30) de coffrage de paroi supérieure est assemblé sur l'élément (10) de coffrage de paroi inférieure. Ces éléments de coffrage assemblés forment le coffrage autonome.
PCT/GB2001/004221 2000-09-22 2001-09-21 Ameliorations dans le domaine du coffrage WO2002025026A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001290072A AU2001290072A1 (en) 2000-09-22 2001-09-21 Improvements in and relating to shuttering

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0023341A GB2361943B (en) 2000-09-22 2000-09-22 Improvements in and relating to shuttering
GB0023341.1 2000-09-22

Publications (1)

Publication Number Publication Date
WO2002025026A1 true WO2002025026A1 (fr) 2002-03-28

Family

ID=9899983

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2001/004221 WO2002025026A1 (fr) 2000-09-22 2001-09-21 Ameliorations dans le domaine du coffrage

Country Status (3)

Country Link
AU (1) AU2001290072A1 (fr)
GB (1) GB2361943B (fr)
WO (1) WO2002025026A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2022025613A (ja) * 2020-07-29 2022-02-10 株式会社Ｗａｓｃ基礎地盤研究所 基礎及び基礎の施工方法

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2423533B (en) * 2005-02-24 2009-09-23 Clive Nightingale Foundation base
WO2010150253A2 (fr) * 2009-06-24 2010-12-29 Basem Hazzan Dispositif, système et procédé pour la protection d'éléments structuraux contre les forces de sol
DE202010014021U1 (de) * 2010-10-08 2011-01-05 Holzmann Gmbh & Co. Kg Schalungselement
GB2522886B (en) * 2014-02-07 2020-03-25 Abbey Pynford Holdings Ltd Shuttering system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL74996C (fr) *
FR423772A (fr) * 1910-02-23 1911-04-26 Francois Cancalon Coffrage pour constructions en béton armé, principalement applicable à l'établissement des plafonds et planchers
GB2240350A (en) * 1989-10-11 1991-07-31 Imer Forming foundation beams

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IE902098A1 (en) * 1989-06-20 1991-01-02 Trenchform Ltd Formwork for forming structural beams
US5367845A (en) * 1993-02-09 1994-11-29 Hartling; Robert H. System for building a structure

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL74996C (fr) *
FR423772A (fr) * 1910-02-23 1911-04-26 Francois Cancalon Coffrage pour constructions en béton armé, principalement applicable à l'établissement des plafonds et planchers
GB2240350A (en) * 1989-10-11 1991-07-31 Imer Forming foundation beams

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2022025613A (ja) * 2020-07-29 2022-02-10 株式会社Ｗａｓｃ基礎地盤研究所 基礎及び基礎の施工方法

Also Published As

Publication number Publication date
AU2001290072A1 (en) 2002-04-02
GB2361943B (en) 2002-04-03
GB0023341D0 (en) 2000-11-08
GB2361943A (en) 2001-11-07

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