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
  • E04G9/00—Forming or shuttering elements for general use
  • E04G9/10—Forming or shuttering elements for general use with additional peculiarities such as surface shaping, insulating or heating, permeability to water or air
• • 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
  • E04G13/06—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills for stairs, steps, cornices, balconies, or other parts corbelled out of the wall
• • 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
  • E04G13/06—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills for stairs, steps, cornices, balconies, or other parts corbelled out of the wall
  • E04G13/062—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills for stairs, steps, cornices, balconies, or other parts corbelled out of the wall for stairs or steps
• • 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
  • E04G9/00—Forming or shuttering elements for general use
  • E04G9/02—Forming boards or similar elements
  • E04G9/05—Forming boards or similar elements the form surface being of plastics

Definitions

• the present invention relates to a method for producing a stair formwork, in particular a spiral staircase, this formwork comprising a lower element called a bench top and upper elements called formwork of the steps.
• finishing layer which is made with a smoothing coating, is delicate and risks being damaged during the installation of the frame and upper elements.
• the present invention proposes to overcome these drawbacks by proposing a formwork method and a formwork produced according to this method, which make it possible to quickly form a spiral staircase by easily adapting to all forms of staircase, to reuse this formwork when it involves making several similar staircases, and in all cases ensuring an exceptional quality of finish while avoiding the use of highly specialized labor and resorting to the use of lifting gear oversized and expensive.
• the horizontal support members arranged to support the said bench are mounted on the walls of the stairwell.
• support members being made up of longitudinal telescopic tubular crosspieces, in that the benchtop consisting of at least one plate of synthetic material is placed on said support members, in that panels are fixed to form the formwork of the steps, and in that one puts in place a metal frame having at least longitudinal reinforcing bars arranged substantially parallel to the surface of said bench.
• the synthetic material used is preferably a polyester resin reinforced with fibers or a multilayer material.
• At least one face of said synthetic material is applied to at least one layer of a polymerizable substance and / or a film of a smooth synthetic material.
• the horizontal support members arranged to support said bench are made up of telescopic longitudinal and transverse tubular crosspieces, said benchtop is formed by placing at least one deformable lattice on said crosspieces, by putting in place on said lattice a precut sheet of thermoformable synthetic material and by applying said sheet of synthetic material on the lattice by heating, panels are fixed to form the formwork of the steps, and a frame is put in place metal comprising at least longitudinal reinforcing bars arranged substantially parallel to the surface of said bench.
• thermoformable synthetic material is preferably a cellular foam, and hinged trellis elements are preferably used to form said deformable trellis.
• the said assemblies are mounted horizontal support members by fixing on at least one wall of the stairwell wall fixing elements arranged to each receive one end of said longitudinal telescopic tubular sleepers of the support members.
• each telescopic tubular cross member can be equipped with at least one coupling element arranged to connect it in a mobile manner to another cross member.
• the formwork obtained according to the method of the invention is characterized in that it comprises horizontal support members arranged to support said bench-top consisting of at least one plate of synthetic material, these support members comprising longitudinal telescopic tubular crosspieces , means for fixing said support members to the walls of the stairwell, panels for forming the formwork of the steps as well as means for fixing these panels.
• each crosspiece comprises a central telescopic rod and at least one ball-shaped head fixed to at least one end of said central rod.
• the bench which can be reused, comprises several juxtaposed and assembled sections, made of a rigid synthetic material.
• the benchtop which cannot be reused, comprises a deformable mesh and a sheet of thermoformable synthetic material.
• the bench support members further comprise transverse telescopic tubular crosspieces arranged to ensure the transverse coupling of at least two longitudinal crosspieces, and each crosspiece is provided with at least one coupling element. agency to receive at least one head from at least one other crosspiece.
• said support members comprise wall fastening elements consisting of a fixing plate and a socket for receiving a head of one of said longitudinal crosspieces.
• FIG. 1 represents a partial perspective view illustrating a first embodiment of a lower formwork element for a spiral staircase of the "half-round" type
• FIG. 2 represents a partial sectional view illustrating an embodiment of the lower formwork element of FIG. 1 for a spiral staircase without a central core
• FIG. 3 represents a cross-sectional view of an embodiment of the bench used in the formwork of FIGS. 1 and 2,
• the figure represents a sectional view illustrating a method of assembling two sections of the benchtop of FIG. 3,
• FIG. 5 represents a partial perspective view illustrating a second embodiment of a lower formwork element according to the invention of a spiral staircase
• FIG. 6 represents a partial view from below of the support members of the embodiment of FIG. 5,
• FIG. 7 represents a partially sectional view of a telescopic tubular cross member of the support members
• FIG. 8 represents a detailed view of a coupling element of the support members illustrated in FIG. 5, and FIG. 9 represents a sectional view of a preferred method of fixing the support members of the formwork of FIG. 5,
• the formwork as illustrated is intended for a spiral staircase of the half-round type and is made so that it can be dismantled and reused for the realization of other similar staircases. It consists of a lower element, formed from a bench 10 supported by support members 16, and standard upper elements (not shown) called formwork of counter steps and serving to delimit said counter steps.
• the upper surface of the bench 10 corresponds to the lower surface of the finished staircase. As such, it is the quality of the finish of this upper surface on which the quality of the finish of the lower surface of the staircase will depend.
• the bench 10 is advantageously made of several sections 10a, 10b,. . . which are juxtaposed and clamped against each other by suitable assembly means described in more detail below, to form an apparently continuous assembly. Joints can be chewed or filled with a suitable substance.
• the central core ⁇ is a substantially flat wall ending in a rounded flank 15, but this core can also be circular or have any profile.
• this type of formwork it is also possible to use this type of formwork in an open stairwell. In this case, the elements must be fixed to supports reconstituting a fictitious stairwell or be mounted on props.
• the lower element is fixed to the side walls of the stairwell and to a central core.
• the support members 16 of the bench 10 consist of longitudinal telescopic tubular sleepers 18, substantially horizontal and more or less spaced depending on the size of the staircase to be made, associated at each of their ends with fastening elements 19-
• these crosspieces comprise at each of their ends a ball head 20 and are, in places, supported on props adjustable verticals 17-
• the ball head 20 of one end of the crosspieces 18 is engaged in a socket 22 of the fastening means 19 of said crosspieces to the wall.
• This socket 22 is associated with a plate 23 disposed below the formwork of the bench. This plate is fixed to the wall by two screws 24. After formwork removal, the screw holes 24 should be plugged.
• the crosspieces 18 comprise at one of their ends a ball head 20 intended to cooperate with the means of attachment 19 to the wall of the stairwell and to their other end of a perforated head 21.
• This perforated head is arranged to engage in a pin carried by an arm 80 which constitutes a guide for a stringer 81 serving to then put in place the shuttering formwork panels.
• the stays 17, which carry the entire formwork, are adjustable in height and provided with a ball head 25, engaged in a cavity of a socket 26 integral with each cross member 18 so that the surface defined by the support members perfectly matches the shape of the bench.
• the bench 10 which constitutes the finishing element and on which the concrete will ultimately be poured, is placed on the support members 16 after their installation.
• This bench shown in section in Figure 3, consists for example of a central plate 30 of a cellular synthetic material coated with two layers 31 and 32 of a polymerized substance such as polyester resin reinforced with glass fibers or carbon fiber applied on both sides of this plate 30.
• a polymerized substance such as polyester resin reinforced with glass fibers or carbon fiber applied on both sides of this plate 30.
• an impregnation film 33 intended to facilitate the formwork.
• each section is provided on its underside with a section of square or bent section, as shown in FIG. 4.
• the two bent sections 41 and 42, respectively integral with the sections 10a, 10b of the bench, are tightened against each other by means of clamping screws 43.
• a flexible seal 44 is interposed for mounting between the two sections to ensure sealing.
• each section is also equipped on its lower face with a slide 27 (FIG. 2) in which a cross member 18 is threaded during assembly, this slide being provided with the bush 26 arranged to receive the ball head 25 of the was 17-
• FIG. 5 Another embodiment of the formwork according to the invention is illustrated in FIG. 5.
• This type of formwork makes it possible to quickly build a staircase of unique and varied shape with an excellent quality of finish. In this embodiment, the bench cannot be reused.
• the support members 116 are produced in the form of a support mesh for the benchtop 110, which has all the required resistance characteristics and which allows adaptation to all forms of stairwells and staircases.
• these bodies consist of crosspieces longitudinal 118 and transverse 118 '.
• These cross members illustrated in more detail in FIG. 7, comprise a central rod 170 composed of two tubes 171 and 172 mounted telescopically and which carry at one of their ends each a head 158 in the form of a ball joint.
• the crosspieces 118 ′ are arranged to connect the longitudinal crosspieces 118 in a mobile manner. To do this, the said crosspieces 118 are fitted with coupling elements 190 as shown in FIG. 8.
• Each of these elements is designed to receive the ball heads 158 'of two transverse crosspieces 118'.
• these coupling elements 190 comprise two lateral sockets 200 receiving the ball heads and a flange 201 which is placed on the central rod of the crosspiece.
• the bench 110 made on these support members 116 consists of a deformable lattice 120 in order to obtain the required shape of the bench and a sheet 121 of a flexible thermoformable synthetic material.
• the trellis 120 is advantageously constituted by an articulated grid which is suitable for warping. It is held in place on the support members 116 by clamps (not shown) or any other similar fixing means. It can also consist of several grids. In the absence of grids, a simple formwork lattice of the mechanically welded type is perfectly suitable.
• the sheet 121 of synthetic material applied to the trellis 120 is precut using a template in a flat plate of thermoformable cellular foam or any other similar flexible thermoformable synthetic material. It is then applied to the mesh 120 and shaped by a current of hot air.
• FIG. 9 represents a partial sectional view which illustrates the preferred method of positioning the horizontal support members 116 of the bench 110.
• the crosspieces used lend themselves to the mounting of a formwork for a stairwell made up of side walls and a central column or wall on which one can fix the wall fixing means 119-
• These fixing means 119 advantageously consist of a fixing plate 150, fixed to the wall by means of a recessed plug 151 and a screw 152, and which carries a fixed nut 153 intended to receive a bolt 154 ensuring the connection with a cross member 118.
• This bolt 154 is housed in a tubular bush 155 secured to a plate 156 carrying a fixed bush 157 provided with an open cavity intended to accommodate the end head 158 in the form of a ball joint of the cross member 118.
• the nut 153 is provided with an upper housing 60 arranged to receive the transverse bars.
• the wall fixing elements 119 will be embedded in the concrete and only openings for the passage of the tubular sockets 155 and the bolts 154 will remain visible when the staircase is exposed.
• other wall fixing means can be provided which can be recovered during formwork removal.
• the shape of the components can be changed somewhat as required.
• the lower surface of the supporting element can be tinted or structured since it will remain permanently as a decorative element under the finished staircase.
• This formwork process can also be used for a "free" staircase, that is to say not located in a stairwell, by using two stringer bars for guiding the formwork and by equipping the support members with two props vertical by cross.

Landscapes

• 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)
• Steps, Ramps, And Handrails (AREA)
• Handcart (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=9449966

Family Applications (1)

Country Status (5)

Families Citing this family (15)

Family Cites Families (11)

• 1993
  • 1993-08-02 FR FR9309647A patent/FR2708651B1/fr not_active Expired - Fee Related
• 1994
  • 1994-08-02 AT AT94921565T patent/ATE149613T1/de not_active IP Right Cessation
  • 1994-08-02 WO PCT/CH1994/000158 patent/WO1995004202A1/fr active IP Right Grant
  • 1994-08-02 EP EP94921565A patent/EP0663038B1/de not_active Expired - Lifetime
  • 1994-08-02 DE DE69401910T patent/DE69401910T2/de not_active Expired - Fee Related

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events