CA2783596C - Implementation process for a supported task and set of forms for its implementation - Google Patents

Abstract

Method for producing a supported structure resting locally on supports, using self-supporting BFUP lost formwork. The invention also relates to lost forms useful for the implementation of such a method.

Description

METHOD OF MAKING A SUSTAINED WORK AND TOGETHER
OF FORMWORKS FOR ITS IMPLEMENTATION

The present invention relates to a method of construction of supported concrete structures. The process of the subject of the invention is in particular the construction of bridges, walkways and floors of buildings. The invention also relates to a set of forms for placing implementation of the method of the invention.
A sustained work is a realization substantially planar concrete having resting ends on supports. The representative work of this type of construction is a building floor or apron of bridge or bridge.
There are two main modes of construction of bridges with concrete structure: the formwork and casting on site and factory prefabrication followed by assembly on the site. The choice of construction method is determined considering the specific requirements of the yard may be of a technical nature (subject to realization: accessibility, weather conditions), economic (cost of operations), structural (skills / resources available).
Concrete structure bridges include generally reinforcing elements forming reinforcements intended to take up tensile forces, shear and flexion.
The formwork of the concrete elements consists of production of molds in the shape of the element wish. They are made from materials specifically able to support the exothermic behavior of the concrete when it is taken, and receive reinforcements intended to strengthen the concrete elements.
Special care must be taken

2 in their realization and their assembly because - the formwork must be rigorously waterproof;
- they must be able to take back the pouring loads (weight of concrete and pressure injection) without deforming in order to respect the geometry of the finished work;
- the reinforcements must include a coating minimum of concrete in order to be preserved from corrosion. So it is necessary to have shims between the reinforcing bars and the formwork to achieve the coating thickness required (exceptionally less than 2 cm).
These forms are mounted on site to the exact implementation of the element of which they define the contours. Vertical panels are frequently crossed by cylindrical metal profiles connecting the elements facing each other and passing through furs, often made of plastic, to avoid their sealing when taking concrete. These profiles are intended to regain the pressure exerted on vertical walls by concrete. Once mounted, adjusted and their geometry controlled, the formwork is filled concrete and possibly vibrated. At the end of a take-up period of several days, the formwork is carefully deposited and the concrete elements as well obtained are verified. That's when the following characteristics: recovery of all reinforcement by concrete, integrity of coating, bubbling, appearance of finished concrete. The holes of passage of the furs are then closed.
There are basically 3 types of formwork:
- single-use formwork (cardboard tubes, wood planks) ;

3 reusable formwork (during construction of several identical elements like batteries architectural bridges or concrete panels works) ;
- modular formwork (mainly used for the realization of straight or plan elements) having composite assemblable elements of a metal structure on which are fixed metal shuttering skins intended to be in contact with the concrete.
The advantages of these solutions lie in the fact that the elements being cast on the spot, no transport of great weight / great length is necessary. An apron of 12 meters by 4 meters, which corresponds to a deck of road traffic bridge at 2 way, can be poured by continuous supply of tops and thus only requires transport of which the unit load allows the passage on any type of road or bridge, without prior administrative authorization or particular escort.
This type of realization however requires the intervention of formers who are workers and highly qualified technicians forming a workforce rare and expensive. Handling means allowing post the formwork materials are required, these means are also necessary when removing formwork, once the concrete is taken. The conformity of the coating of the irons is discovered only with the use or by non-destructive testing. These forms are expensive: they account for around 40 to 60% of the price of reinforced concrete and the use of reusable formwork increases the weight of these and therefore impacts the means of handling. The formwork removal phase penalizes the schedule. The facing to obtain (appearance of the finished concrete) requires a great deal of care when setting up the = 4 formwork, especially for architectural renderings.
The structures include the traces of filling of the fur holes that remain visible, unsightly and can be a source of leakage fluvial). A correct demoulding forces the application toxic release agents prior to concreting operations, which difficulties for river works. Reuse of forms on the same structure, in order to reduce the financial impact, requires a phasing of works that weighs heavily on the schedule. Sometimes the The very configuration of the premises precludes the use of formwork for reasons of clutter of the feet of banches or environment.
Prefabrication consists in dividing the work into sub-elements, manufacture these in the factory and the route to where they will be assembled for thus reconstitute the final work. Sub-elements have systems allowing their solidarity. he is usually projecting reinforcement sub-elements prefabricated and intended to be drowned in a junction concrete. The sub-elements are usually made in specialized factories reusable formwork in conditions environmental control with quantities of concrete less important. The faculty of casting the element in a position that is not necessarily the one he occupies in the book also allows for better control the various concreting parameters. This solves the problems of availability of skills on site, shorten on-site response times by eliminating the times of formwork and stripping, and the concrete supply constraints on site. However, prefabrication, to be economical, requires the carrying out, transporting and handling elements massive. This results in high transport costs (large / large exceptional transports loads) and handling (need power of larger lifting). In addition, there are 5 parts of work that can not be prefabricated, particularly the anchoring beds of the deck, which soliden this one with the piles of foundation.
Structural bridges can appear as a solution allowing a gain of weight. Indeed, steel is comparatively lighter than concrete for similar efforts.
Thus, for the same load recovery by an element prefabricated, the mass to be handled is less for the steel sub-element. The metallic structure to realize is divided into sub-elements. These metal elements are prefabricated and painted before being shipped on site. They are then put in place and assembled, the most often by bolting or welding. However, steel remains a much more expensive raw material than the concrete. Steel requires anti-corrosion protection costly and followed maintenance which, in practice, is often neglected.
Problems similar to those previously described may arise for the manufacture of supported large dimensions in other applications and especially in the building.
Footbridges represent a category particular bridge subject to crossing loads do not including no road or railway loads. The circulation generally takes place on a decking extending between two longitudinal beams. This decking is frequently made up of elements transverse wood or metal spaced one of the others in order to evacuate rainwater and to propose a pleasant perception of the void under the bridge. Such decks however present several disadvantages.
- in contact with water, these become slippery and therefore require the application of coating anti-slip by gluing or creating asperities;
- the wooden decks are gray with time and are the object of deformations (twisting, buckling, arrow) caused by hygrometric changes, UV exposure, alternating freeze / thaw cycles and the use of de-icing salts;
- metal decking is less sensitive geometric variations but require the implementation expensive materials (stainless steel) to ensure sufficient durability.
An object of the invention is to propose a method realization of supported works simple and economic, can be implemented by a workforce normally qualified and using means of light handling.
For this purpose, it is provided, according to the invention, a process for producing a sustained resting work locally on supports. The process comprises the steps of.
a) install on supports a support formwork intended to receive on one hand the ends of expectations of support and secondly of the formwork ends of structural beams, each support formwork comprising a series of notches for receiving and bracing structural beams, b) Pour concrete into the support formwork to secure support forms and expectations support, (c) set up beam formworks for structure and a reinforcement, According to a first embodiment, the method also includes, as a result of these early stages, the steps of:
d) put in place a sealing profile between each pair of adjacent structural beams, e) Pour concrete to fill the forms;
support formwork, beam formwork structure and the sealing profiles being formwork lost in UHPC.
According to a particular embodiment, the formwork of structural beams comprising, on to less a wing, notches for receiving and bridging transverse elements, the process also includes following these first steps, the steps of:
d) set up cross-cutting elements;
e ') pouring concrete to fill the formwork;
support formwork, beam formwork structure and transversal elements being in UHPC;
f ') put a protective chaperon on the part upper formwork of the structural beam.
Forms are lost formwork in concrete Ultra High Performance Fiber (UHPC) whose mechanical characteristics are added to those concrete and reinforcement to form those of the finished work. They are advantageously prefabricated factory. These forms are preferably self-supporting in to the extent that they do not require support, their structure being then arranged to allow recovery efforts due to reinforcement, and casting.
This solution has the following advantages - the formwork is easily handled because they do not represent that the envelope of the beams of which they have the form. So the handling can be done with ordinary light means even manual;
- in the particular case of supported structures whose range is of the order of 12 meters or less, all the elements are transportable by semi-trailers standard, without the need for authorization or escort particular;
- prefabricated formwork requires little skills to be put in place, the system of formwork that can incorporate constructive provisions intended to ensure the positioning of the elements one against another;
- the use of formwork lost in BFUP eliminates the dismantling phase and the materials required for this this. The advantage of reduced maintenance compared to the use of metal structures is preserved.
Supporting forms will be advantageously equipped with a system of lights and washers that allows to absorb the tolerances of laying and vertical expectations of the support structure: anchoring piles or reinforcement of head of posts or masonry.
Depending on the handling means available, the formwork in UHPC will be able to receive their prefabrication, the internal reinforcement beams whose outlines they define. These frames may be partially secured by a first limited concreting during prefabrication. These frames may be prestressed, making it possible to avoid performing these costly operations on the site after mounting. Finally, longitudinal strands, prestressed or not, are preferably embedded in the heel in BFUP
beams and provide them with sufficient strength to allow efforts to be resumed relatively important.
The invention then makes it possible to achieve, to a lesser cost, a sustained work whose manufacture does not No exceptional transport or lifting means particular. Operations requiring manpower qualified or even highly qualified (formwork, prestressing) are removed from the site. The facing of the work is controlled, the amount of concrete to bring on site is reduced, the presence of toxic products zero.
Finally the realized work has the facilities of maintenance of a work without metal elements exteriors. The conformal coating of the reinforcements is also guaranteed.
The subject of the invention is also a set of formwork lost in UHPC for the implementation of this process.
Other features and benefits of the invention will emerge from reading the description following of particular embodiments not limiting of the invention.
Reference will be made to the accompanying drawings, among which :
- Figure 1 is an overview, according to a first embodiment of the invention, formwork before concreting for the realization a bridge deck;
FIG. 2 is a view of the support formwork for the realization of a bridge deck according to the embodiment of Figure 1;
FIG. 3 is a view representing a structural beam formwork bonded by a Sealing profile in C with a formwork for making a bridge deck or a floor according to the embodiment of the figure 1 ;
FIG. 4 is an overview of the formwork before concreting a second mode of embodiment of the invention for confection a floor;
FIG. 5 is a view showing a structural beam formwork bonded by a sealing profile in II to a shore formwork for making a bridge deck or a floor;
FIG. 6 is an overview, in partially scratched perspective, formwork before concreting for the realization a gateway in accordance with a third embodiment of the invention;
FIG. 7 is a view of the support formwork for the realization of a bridge according to the embodiment of Figure 6;
FIG. 8 is a sectional view representing structural beam formwork bound by a cross member to another formwork of structural beam for the realization of a gateway according to the embodiment of the Figure 6;
Figure 9 is a sectional view of a beam of structure provided with a protective chaperone, according to the embodiment of Figure 6;
Figure 10 is an overview representing a transverse element, according to the embodiment of Figure 6;
FIG. 11 is a view representing the section of the transverse element of the figure 10;
- Figure 12 is a cross-sectional view a gateway according to the embodiment of Figure 6.
The invention relates to a manufacturing method of a sustained work and a set of formwork to this effect.
A first embodiment consists of the construction of a bridge for the crossing of a breach of about twelve meters. The bridge consists of two massifs designated 100 and an apron, generally designated 2, connected to the masses 100 by its ends. In this first embodiment, the structural beams 2.1 are deck beams 2.1.
The formwork set includes several formwork lost in UHPC. It thus includes two support forms generally designated as 1, formwork of 2.1 deck beams and profiles 2.3. Interior surfaces of formwork are indented so as to ensure a good grip of the concrete poured into the lost formwork while their outer surfaces to be visible are here smooth to give the finished work its state of final surface.
The apron beam formwork 2.1 include BFUP plates assembled at each others to form two souls and a heel arranged according to a U-profile. Two of the apron beam formwork are intended to form shores of the apron, the said two formwork with souls of different heights, the highest soul being intended to form an edge side of the apron. The formwork of apron beams 2.1 include, here, prestressed strands 2.4 extending longitudinally in their heel. These strands 2.4 strengthen the longitudinal strength of formwork of apron beams 2.1 and are dimensioned for allow deck formwork 2.1 from withstand the load of reinforcement, concreting and authorize the movement of staff especially to achieve transverse reinforcement.
Each sealing profile 2.3 is arranged to way to achieve the seal between two beams of apron 2.1 adjacent. Each sealing profile 2.3 has thus a form of plate provided with lateral edges and intended to stretch out straddling the souls opposite two adjacent beams, each edge being received between the souls of the same beam to ensure the maintenance lateral in position of the sealing profile.
The formwork of deck deck 2 is thus consisting of apron beam formwork 2.1 receiving 2.2 frames and caps with formwork adjacent by sealing profiles 2.3. The height finished apron is determined by the height of the souls external beam formwork 2.5 which is ideally at the same level as the height of the flanks of support forms 1.
The two support forms 1 are of form parallelepiped and include, on their walls facing each other from the breach to be crossed, a series of notches for the formwork apron beams 2.1 and to brace them. The bottom support forms are pierced with several openings 1.2 designed to receive the salient expectations of support. Advantageously, the openings 1.2 will have dimensions to absorb tolerances of implantation and verticality of piles.
sealing washers 1.3, whose inside diameter allows to engage the washer around the pile, are positioned before the implantation of the support formwork 1.
The outer contour of these washers 1.3 is adapted to the realization of a seal with the opening 1.2 which may be circular, square or of any shape and for example oblong. The sealing washers have external dimensions greater than those of openings 1.2. This arrangement avoids on-site surveys prerequisites. These formwork of massifs 1 receive before concreting reinforcement cages 1.4 positioned at sufficient coating distance.
At first, the washers 1.3 are implemented on the expectations of support on both sides of the breach. The formwork 1 is then positioned on the heads of the piles 8, the openings 1.2 allowing the Passage of the pile heads and their presence inside the parallelepiped defined by each support formwork 1.
The washers 1.3 arrive in recovery with the bottom of the support casing 1 and provide a seal for the future concreting. A bead of suitable type sealant can be placed at the interface of these 2 elements if necessary.
The notches 1.1 made in the formwork 1 are pointed towards the gap and face each other.
The axes of the notches will be ideally aligned. A cage reinforcement 1.4 is then arranged at the bottom of the formwork 1, at a sufficient distance from the coating. A first layer of concrete is then poured, solidarising the formwork and the base of the reinforcement cage with the heads of the stakes. The level of this first layer is ideally located below the base of the notches 1.1.
Once this concrete is being taken, the 2.1 apron beam formwork are arranged between the two support forms 1 in the notches 1.1 is facing. Their implementation does not require any particular control, the notches defining even the position of the deck beam formwork 2.1. Thus, a rigorous implementation of formwork of support allows to implement without special precaution the formwork of deck beams 2.1. The rigidity of these forms allows the movement of personnel on these beams and thus allows the laying of reinforcement 2.2 in the beam formwork of apron 2.1 by hand, to avoid the use powerful handling means. The outer souls formwork of the beams of banks 2.5 of the deck 2 include an extra length corresponding to the thickness additional slab and runway. A

possible additional reinforcement of the support formwork 1 can then be realized.
The sealing profiles 2.3 are positioned from way to connect the adjacent souls of the formwork of 2.1. The formwork of the bridge is then complete. The transversal reinforcement can then be laid and the pouring apron start.
This concreting takes place ideally in a single phase and fills the support forms 1 with their reinforcements 1.4, beamforms 2.1 with their reinforcements 2.2. The sealing profiles 2.3 allow the concrete to rise to the final level defined by the height of the flanks of support formwork 1 and edge beams 2.5 of the apron 2. A reserve may be provided for the in place, after setting the concrete, a coating of rolling such as bitumen or macadam.
Transition tiles 4 prefabricated in BFUP
and supported by a compacted embankment are laid in support between the bridge and the road embankment. They will be then surfaced with the common wearing course road and bridge. For works of bridge reach object of this embodiment, the road joints and neoprene supports are not useful.
Once the concrete poured during the second and final concreting operation is completed, the bridge can receive its accessories (railings, wearing course, ground signaling paint, etc ....).
A second embodiment consists of the construction of building floors. Floor rests on its ends on masonry supports:
studs, beams or supporting walls projecting from which extend metal expectations. In this second mode embodiment of the structural beams 2.1 are beams 6.1. Floor 2 consists of two support formwork 1 connected by beams 6.1 and supporting a slab.
Forms needed for this realization are .
5 - support forms 1, - 6.1 beam formwork, - sealing profiles. 2.3 All these elements are made in UHPC and have the same constructive provisions as the 10 forms of the preceding embodiment in particular:
indented or ribbed inner surface, strands prestressed longitudinal members, holes 1.1 providing the possibility to include reinforcement beams 6.1 in the formwork ...
In this particular application, the realization of a floor supported by several supports as shown in fig.4 makes it necessary to implement 1.5 intermediate support formwork of notches 1.1 on two of its faces.
The support forms 1 are arranged on posts 7. Extreme supports receive formwork 1, the supports of the intermediate bays receive support forms 1.5. All these support forms are provided at their bottom with cutouts 1.2 allowing the passing 7.1 expectations emerging from the poles 7. These positioned forms, they receive the 1.4 frames and are partially concreted. Girder formwork 6.1 are then positioned in the notches 1.1 and connect forms 1 and 1.5. Profiles 2.3 seals are put in place between the souls adjacent two beams 6.1. Any eventual transversal reinforcement can then be installed.
It will be noted that the souls in excess of the formwork of shores 2.5 can be advantageously replaced by the wall walls delimiting the building. All of the forms 1, 1.5, 6.1, 2.3, 2.5 or the walls of the building realizes a closed volume in which are poured at the same time the slab and the beams of the floor.
Once this concrete phase is taken completed, the floor is finished.
Elements identical or similar to those previously described will carry a numerical reference identical to these in the following description of a third embodiment.
With reference to FIGS. 6 to 12, this third embodiment relates to the construction of a bridge 10 having a decking 11 composed of transverse elements 12 of which only part is represented in FIG. 6. The bridge 10 rests by its ends on masses 100 projecting from which extend piles 8. In this embodiment particular, the support forms 1 are identical to those previously described but only include two notches 1.2 facing the breach and located at ends of the largest edge of the support formwork 1. The notches 1.2 of each support casing 1 face each other and receive structural beam formworks that are, here, longitudinal rib formings 13.1 represented in broken lines in FIG.
longitudinal rib formwork 13.1 have a structure identical to structural beams 2.1 previously described and include each, on their wings facing, notches 14 T-shaped for accommodate transversal elements 12. With reference to FIGS. 10 and 11, each transverse element 12 is prefabricated in BFUP and has a T-shaped section comprising a horizontal upper portion 12.1 on which is the circulation and a part lower 12.2. A longitudinal reinforcement 15 embedded in the lower part 12.2 of the transverse element 12 ensures the shear and flexural strength of this one. Cross-cutting element 12 has two expectations of reinforcement 12.3 each consisting of a protrusion of the frame 15 on both sides of the element transversal 12.
The realization of the gateway 10 begins with the laying sealing washers 1.3 on the heads of piles 8. Supporting forms 1 are then positioned on the pile heads 8 so that the notches 1.2 in each support form 1 shall be oriented towards the breach and that their axes are aligned. A reinforcement cage 1.4 is then arranged in bottom of support formwork 1, at a sufficient distance coating. A first layer of concrete is then casting, solidarisant the support formwork 1 and the base of the reinforcement cage 1.4 with the heads of the piles 8. The upper level of this first layer is ideally located below the base of the notches 1.2.
Once this concrete is being taken, the longitudinal rib formwork 13.1 are arranged between the two support forms 1 in the notches 1. 2 facing each other Their implementation does not require any particular control, notches 1.2 defining of themselves the position of rib formwork longitudinal 13.1. Thus, a rigorous implementation support forms 1 allows to implant without special precaution the rib formings longitudinal 13.1. The rigidity of these forms allows moving staff on these and so authorizes the laying of the longitudinal reinforcement 2.2 in the longitudinal rib formwork 13.1 by hand, to avoid the use of means of powerful handling. A second phase of concreting is then performed in order to fill the rib formings Longitudinal 13.1 until the arase of the part bottom of the notch 14. The transverse elements 12 are then placed in the corresponding notches 14.
The expectations of 12.3 reinforcement come then in protrusion in each form of longitudinal rib 13.1 a little above the concrete level previously sank. The installation of these transverse elements 12 can be make progress from an equipped mobile frame a safety net and resting on both ribs longitudinal 13.1.
Once the set of transversal elements 12 placed in the notches 14, a last phase of concreting comes to cover the expectations of reinforcement 12.3 and finishes filling the rib formings 13.1 and the support formwork 1. This concreting phase can seal the elements components of the bridge 10 and their phases of concreting respective pile heads 8, formwork 1, longitudinal rib formwork 13.1, cross-cutting elements 12. Referring to Figure 9, a protective cap 16, in the form of a plate of length and width identical to those of the rib longitudinal 13.1 and provided with a central tongue 17 protruding inward of the longitudinal rib 13.1 is then placed in contact with fresh concrete. This chaperone closes the forms of the bridge 10 which then only has surfaces in UHPC, the support forms receiving transition slabs 4 prefabricated in BFUP. Tab 17 helps to ensure effective sealing of the protection chaperone 16 with the concrete of longitudinal rib formworks 13.1. A
railing 18 is then attached to the plumb of each longitudinal rib 13.1 using ankles mechanical 19 passing through the protective chaperone 16. This protective chaperone 16 has a return on one of its longitudinal edges coming into contact with the face outside of the longitudinal rib 13.1.
A gateway 10 is thus obtained whose decking 11 has strength and durability superior to existing gateway solutions.
Advantageously, the upper part 12.1 of transverse elements 12 includes a top surface 12.4 molded on wood matrix, giving the element transversal 12 the appearance of a wooden decking. The UHPC
in which is composed the transverse element 12.1 can also be tinted to further highlight the appearance wood of it.
Thus, the invention makes it possible to realize, without the intervention of qualified manpower nor means of heavy lifting, supported concrete structures of a fast and economical way. These books have the additional feature of allowing cost of maintenance is almost zero, the reinforcements being protected by a very durable UHPC skin. Fire resistance is increased by the skin in UHPC.
Of course, the invention is not limited to embodiments described but encompasses any variant within the scope of the invention as defined by the claims.
In particular - formwork can incorporate protrusions on their internal faces intended to stall reinforcement at the minimum required coating distance as well as to lock in position the frames in the formwork;
- structural beam formwork 2.1 can be molded or extruded;
- structural beam formwork 2.1 or of supports 1 can integrate, from the prefabrication their frames;
- structural beam formwork 2.1 can integrate the sealing profiles: one of the two souls has a salient element perpendicular to the soul and directed outward of the formwork. This element is implanted tangent to the upper part of 5 soul and has a length that allows him to rest on a another protrusion intended to receive it and implanted on the soul of the next element;
- the formwork can incorporate ears or Handling or lifting handles, reinforced or not 10 frames;
- the beam formwork section of structure 2.1 can be I in T or TT with the integration of all or part of the reinforcement necessary ;
The formwork may not contain prestressing elements;
the reinforcements can be active or passive, possibly prestressed during prefabrication or after concreting on site;
The spacing of the beam formwork from structure 2.1 can be achieved using combs of positioning ;
- the plates in BFUP can receive, from the prefabrication the final finish required: coated, stained, engraved;
the sealing profiles 2.3 may have a FI section (Figure 5);
- although here the notches 14 receive transverse elements 12 whose section is in T, the invention also applies to other forms notch and corresponding beam section as for example rectangular sections, L, I;
- although here, the gateway 10 only understands two longitudinal ribs 13.1, the invention applies also to a bridge with more than two longitudinal ribs, additional ribs being provided on both sides with notches welcoming transverse elements 12;
- although here the transversal elements 12 are made in UHPC, the invention also applies to transverse elements made of other materials such as stone, wood, metal, concrete standard;
- although, here, an upper face 12.4 of the transverse element 12.1 is molded on a wood matrix, the invention also applies to elements transversal having no molding at the top or bearing other types of casts such as indentations, tears, grooves, anti-slip lugs;
- although here the protective chaperone 16 be fixed to the concrete filling the ribs longitudinal 13.1 by sealing, the invention also applies to other modes of fixation such as mechanical or chemical pinning;
- although, here, a concrete is poured into the longitudinal ribs 13.1 before laying the elements 12, the invention also applies to a single phase of concreting solidarizing the reinforcement longitudinal 2.2, longitudinal rib formwork 13.1 and transverse elements 12 with formwork 1 and 100.

Claims (24)

22 1. Method of producing a supported work resting locally on supports, including the steps from:
a) install on supports a support formwork intended to receive on one hand the ends of expectations of support and secondly of the formwork ends of structural beams, each support formwork comprising a series of notches for receiving and bracing structural beams, b) Pour concrete into the support formwork to secure support forms and expectations support, (c) set up beam formworks for structure and a reinforcement. 2. Method according to claim 1, comprising also the steps of:
d) put in place a sealing profile between each pair of adjacent structural beams, e) Pour concrete to fill the forms, support formwork, beam formwork structure and the sealing profiles being formwork lost in UHPC. 3. The process according to claim 1, wherein the formwork of the structural beams comprise, on at less a wing, notches for receiving and bridging transverse elements, the process also comprising the steps of:
d) set up cross-cutting elements;
e ') pouring concrete to fill the forms, support formwork, beam formwork structure and transversal elements being in UHPC;
f ') put a protective chaperon on the part upper formwork of the structural beam. 4. The process of claim 1 comprising prior to the installation of support forms on supports, a step of setting up, around each waiting for support, a sealing washer in BFUP, the support forms having a bottom pierced with openings for the passage of waiting support with a game designed to compensate for a tolerance of implementation of expectations the sealing washers having dimensions external to those of the openings. The method of claim 2, wherein supports are masonry structures or poles, the beams of structures are beams and the structure supported is a floor. The method of claim 2, wherein the supports are piles or masses of foundations, the structural beams are apron beams and the supported work is then a bridge deck. The method of claim 3, wherein the supports are piles or masses of foundations, the structural beams are ribs longitudinal and the supported work then includes a bridge decking. The method of claim 1, wherein an intermediate support formwork resting on a support intermediary liaises two supported works adjacent The method of claim 1, wherein at least part of the reinforcement is pre-assembled in the structural beam formwork. The method of claim 1, wherein structural beam formwork or formwork of support incorporate at least one prestressing element longitudinal embedded in the UHPC. 11. Set of formwork lost in UHPC for the implementation of the method according to any one of Claims 1 to 10, comprising at least one formwork support and structural beam formwork. 12. The assembly of claim 11 comprising also sealing profiles. 13. An assembly according to claim 11, in which support formwork is substantially parallelepiped and has a bottom pierced with openings so to accommodate support expectations and a side wall notched holes for receiving and bracing structural beam formwork, support formwork being arranged to receive the reinforcement of the element of which he constitutes the envelope. 14. An assembly according to claim 11, in which each formwork of structural beam is arranged in order to receive the reinforcement of the beam of which it constitutes the envelope. 15. The assembly of claim 11, in which each formwork of structural beams comprises two souls extending on either side of a heel, two structural beam formwork being intended for forming banks of the supported work, said two structural beam formwork comprising souls of different heights, the highest soul being to form a side edge of the supported work 16. The assembly of claim 11 in which the sealing profile is arranged so as to seal between two structural beams adjacent. 17. Element according to claim 11, in which the inner face of the UHPCF forms has a state surface facilitating the recovery of concreting. 18. An assembly according to claim 11, in which a support formwork has two series notches arranged to accommodate beams structure rushing from two different supports. 19. Process according to any one of Claims 1 to 3, wherein the formwork of Structural beams consist of plates made of UHPC. 20. Process according to any one of Claims 1 to 3, wherein the formwork of structural beams consist of plates made of UHPC
assembled to form a U-shaped cross section. 21. The method of claim 2, wherein the sealing profiles consist of plates made of BFUP assembled to form a cross section in C
returned or in .PI. in order to overlap souls in look at structural beam formwork. 22. The method of claim 3, wherein the protective chaperone is in UHPC. 23. The method of claim 3, wherein the notches of the structural beams are in the form of T. 24. The method of claim 3, wherein at least one transverse decking element has a molded face on wood matrix.