EP1085139A1 - Continuous web assembly for mixed framework structures and structure realised with such a web assembly - Google Patents

Abstract

The frame for a mixed ferro-concrete building beam (A) has alternating panels (alpha I) and pillars (Beta I). The panels resist shear loads and the pillars resist normal loads. The pillars and panels are connected together. The pillars can be adapted to transmit shear loads to the adjacent panels.

Description

The present invention relates to a core assembly continuous for a mixed-structure structure, as well as a mixed-structure structure made with such a soul set.

A mixed-structure structure can include, conventionally, upper and lower slabs made of prestressed concrete, interconnected by minus one continuous core assembly made of steel.

We have seen that in this type of structure, part of the prestressing efforts were spent in soul sets, making them less available to take back the cutting forces due to dead weight of the upper slab as well as loads operating conditions (vehicle traffic, etc.).

We also noted that the removal of concrete induced parasitic stresses in sets of souls.

Patent FR 2 494 400 teaches a set of souls continuous for a mixed-structure structure which allows to solve the above problems.

The soul set continues taught by this document is remarkable in that it is formed by sheets of pleated or corrugated steel (or other material).

Thanks to this peculiarity, the soul set does not resumes that sharp efforts, allowing avoid prestressing leaks and stresses parasites related to concrete shrinkage.

For certain structures requiring for example making long spans, it can be necessary to use steel sheets which the thickness reaches ten or even twenty millimeters.

However, pleated or corrugated steel sheets are difficult and expensive to manufacture as soon as you reach a thickness of several millimeters.

The object of the present invention is to provide a set of continuous soul allowing to get rid of these disadvantages.

This object of the invention is achieved with a set continuous core for a mixed-structure structure, remarkable in that it includes, alternately, first elements adapted to resist efforts sharp and second elements adapted to absorb normal efforts, and in that said first and second elements are reported on each other by suitable fixing means.

Thanks to these characteristics, we can manufacture this continuous core assembly, called "plano-tubular core structure ", From simple elements that we find commercially, and which are assembled in the factory or on the construction site of the structure.

No forming of these materials is therefore necessary, which makes it possible to have recourse to a range very wide thicknesses without cost are prohibitive.

• lesdits seconds éléments sont en outre adaptés pour transmettre des contraintes de cisaillement de chacun desdits premiers éléments aux premiers éléments adjacents,
• lesdits premiers et seconds éléments sont formés dans un matériau qui peut être du métal ou un alliage métallique tel que l'acier, et ils sont fixés les uns sur les autres à l'aide de soudures ou de tout moyen de fixation adapté au matériau utilisé,
• lesdites soudures s'étendent sur toute la longueur des zones de liaison entre lesdits premiers et seconds éléments,
• lesdites soudures sont pleines,
• lesdits premiers éléments sont des plaques sensiblement planes, et lesdits seconds éléments sont des cylindres creux,
• lesdits cylindres creux ont une section circulaire,
• lesdits cylindres creux de section circulaire sont des tubes pétroliers,
• des platines supérieure et inférieure sont fixées respectivement sur les parties supérieure et inférieure desdits premiers et seconds éléments, et des cornières sont fixées sur les faces extérieures desdites platines,
• une pluralité de cornières sont fixées sur chacune desdites platines au droit de la périphérie de chacun desdits cylindres,
• quatre cornières sont fixées sur chacune desdites platines au droit de la périphérie de chacun desdits cylindres de section circulaire.

According to other characteristics of the core assembly according to the invention:

• said second elements are further adapted to transmit shear stresses from each of said first elements to the first adjacent elements,
• said first and second elements are formed from a material which can be metal or a metal alloy such as steel, and they are fixed to each other using welds or any fixing means suitable for the material used ,
• said welds extend over the entire length of the connection zones between said first and second elements,
• said welds are full,
• said first elements are substantially planar plates, and said second elements are hollow cylinders,
• said hollow cylinders have a circular section,
• said hollow cylinders of circular section are petroleum tubes,
• upper and lower plates are fixed respectively on the upper and lower parts of said first and second elements, and angles are fixed on the outer faces of said plates,
• a plurality of angles are fixed to each of said plates in line with the periphery of each of said cylinders,
• four angles are fixed on each of said plates to the right of the periphery of each of said cylinders of circular section.

The present invention also aims to provide a less costly mixed-structure structure to manufacture only the works of the prior art.

This object of the invention is achieved with a work mixed-frame art, remarkable in that it includes upper and lower slabs linked together by at least one set of continuous souls conforming to what precedes.

• lesdits hourdis sont reliés entre eux par deux ensembles d'âme conformes à ce qui précède, disposés parallèlement l'un à l'autre,
• la largeur dudit hourdis supérieur est supérieure à celle dudit hourdis inférieur, et des bracons inclinés sensiblement à 45° et formant un V ou un W sont interposés entre lesdits hourdis,
• lesdits hourdis sont en béton précontraint.

According to other characteristics of this structure:

• said slabs are connected together by two sets of webs conforming to the above, arranged parallel to each other,
• the width of said upper slab is greater than that of said lower slab, and struts inclined substantially at 45 ° and forming a V or a W are interposed between said slabs,
• said slabs are made of prestressed concrete.

• la figure 1 est une vue en perspective d'un ensemble d'âme continue selon l'invention,
• la figure 2 est une vue en coupe de cet ensemble d'âme, selon le plan P de la figure 1,
• la figure 3 est un agrandissement d'un détail D de la figure 2, et
• la figure 4 est un profil en travers d'un ouvrage d'art à ossature mixte dans lequel sont incorporés deux ensembles d'âme selon l'invention.

Other characteristics and advantages of the present invention will appear on reading the description which follows and on examining the appended drawing, in which:

• FIG. 1 is a perspective view of a continuous core assembly according to the invention,
• FIG. 2 is a sectional view of this core assembly, according to the plane P of FIG. 1,
• FIG. 3 is an enlargement of a detail D of FIG. 2, and
• Figure 4 is a cross section of a structure work with mixed framework in which are incorporated two sets of core according to the invention.

In these figures, numerical references identical designate organs or sets of organs identical or analogous.

Referring now to FIG. 1, in which it can be seen that the continuous core assembly A according to the invention comprises, alternately, first elements α _i preferably having the form of flat plates, and second elements β _i preferably having the shape of hollow cylinders of circular section.

These elements α _i , β _i are attached to each other by suitable fixing means.

Preferably, these elements α _i , β _i are formed from a material which can be metal or a metal alloy such as steel, and the second elements β _i can be obtained from petroleum tubes cut to the desired length. .

In this case, the first α _i and second β _i elements are fixed to each other by solid welds extending over the entire length of the connection zones between these elements.

As illustrated in FIG. 3, we denote by full weld a weld in which the parts to weld are in contact without overlapping, as opposed to a butt weld.

To make such a weld, the edges of the first elements α _i are machined so as to obtain two chamfers 1, 2 inclined substantially at 45 °, then just weld beads 3, 4 are placed in the spaces between these chamfers and the periphery of the corresponding second elements β _i .

Referring again to FIG. 1, it can also be seen that upper 5 and lower 6 plates are fixed respectively to the upper and lower parts of the first α _i and second β _i elements.

These plates 5, 6, which have the form of strips, are preferably formed from the same material as the first α _i and second β _i elements, and they are preferably attached by welding to these elements.

Angles γ _i , λ _i are fixed on the outer faces of the upper 5 and lower 6 plates, at regular intervals.

These angles γ _i , λ _i , which have the form of simple brackets, are preferably formed from the same material as the upper 5 and lower 6 plates, and they are preferably attached by welding to these plates.

Several, and preferably four angles, are preferably fixed on each of the plates 5, 6 in line with the periphery of each of the second elements β _i .

We now refer to Figure 4, on which the cross section of a work of art has been shown mixed frame incorporating two sets of webs A1, A2 in accordance with the above.

As can be seen in this figure, these two core sets A1, A2 are interposed between slabs upper 7 and lower 8, preferably made of Prestressed concrete.

These core assemblies A1, A2 extend parallel to each other in a direction perpendicular to the plane of the figure, and they are connected to the upper 7 and lower 8 slabs by means of the angles γ _i , λ _i which are drowned in the concrete of these slabs.

The upper slab 7 is intended, for example, to support a roadway or railway track, and, in the chosen case, its width is approximately twice as large to that of the lower slab 8.

Four struts 9, 10, 11, 12 inclined substantially at 45 ° and forming a W (or, in a variant not shown, a V) are interposed between the upper slabs 7 and lower 8 so as to support the middle part and the cantilevered parts of the upper slab 7.

Although only a set of four poachers was shown in Figure 4, of course understand that such sets of poachers are arranged at regular intervals along the profile the work of art.

The Behavior and Benefits of the Soul Set A according to the invention will be highlighted in what follows.

The first elements α _i are adapted to withstand sharp forces due to the dead weight of the upper slab and to operating overloads (vehicle traffic, etc.).

It will be recalled here that the term “cutting forces” designates forces oriented along the direction of the axes of the second elements β _i , materialized by the axis T in FIG. 1.

The second elements β _i are adapted to absorb normal forces, due in particular to the prestressing of the structure and the shrinkage of the concrete: in fact, by their tubular shape, these second elements β _i are liable to deform in s ovalizing under the effect of such efforts, and thus releasing the first elements α _i from parasitic stresses.

It is recalled here that the term "normal forces" designates forces oriented in a direction parallel to the first elements α _i and perpendicular to the axis T, materialized by the axis N in FIG. 1.

According to a possible comparison, the second elements β _i play a role close to that which would play springs of significant stiffness placed between the first elements α _i .

In addition, the second elements β _i make it possible to transmit shear stresses from each of the first elements α _i to the first adjacent elements α _i-1 , α _{i + 1} , thus reinforcing the stability of the structure.

The upper 5 and lower 6 plates and the angles γ _i , λ _i ensure a slip-free connection between the core assembly A and the slabs 7, 8.

According to a main advantage of the core assembly according to the invention, the first α _i and second β _i elements which constitute it can be easily found commercially, and their assembly on site or in the factory poses no particular difficulty. , whatever their thickness.

This overcomes the additional costs associated with the use of pleated or corrugated sheets.

According to another advantage, by its character continuous, this whole soul can withstand strong shear stresses punctually printed and successively over its entire length, which makes it suitable to be used for engineering structures including aprons are intended to be put in place by pushing.

As we can understand now, the whole according to the invention is easy and inexpensive to manufacture, even when you need a thickness important.

Of course, the present invention is not limited to the embodiment described and shown, provided by way of illustrative and nonlimiting example.

Claims (15)

Continuous core assembly (A) for a structure with mixed framework, characterized in that it alternately comprises first elements (α _i ) adapted to resist shearing forces and second elements (β _i ) adapted to absorb normal forces, and in that said first (α _i ) and second (β _i ) elements are attached to each other by suitable fixing means. Continuous core assembly (A) according to claim 1, characterized in that said second elements (β _i ) are further adapted to transmit shear stresses from each of said first elements (α _i ) to the first elements (α _{i- 1} , α _{i + 1} ) adjacent. Continuous core assembly (A) according to one of claims 1 or 2, characterized in that said first (α _i ) and second (β _i ) elements are formed from a material which may be metal or a metal alloy such than steel, and in that they are fixed to each other using welds (3, 4) or any fixing means suitable for the material used. Continuous core assembly (A) according to claim 3, characterized in that said welds (3, 4) extend over the entire length of the connection zones between said first (α _i ) and second (β _i ) elements. Continuous core assembly (A) according to one of claims 3 or 4, characterized in that said solders (3, 4) are full. Continuous core assembly (A) according to any one of the preceding claims, characterized in that said first elements (α _i ) are substantially planar plates, and in that said second elements (β _i ) are hollow cylinders. Continuous core assembly (A) according to claim 6, characterized in that said cylinders hollow have a circular section. Continuous core assembly (A) according to claim 7, characterized in that said cylinders hollow circular sections are petroleum tubes. Continuous core assembly (A) according to any one of the preceding claims, characterized in that upper (5) and lower (6) plates are fixed respectively on the upper and lower parts of said first (α _i ) and second ( β _i ) elements, and in that angles (γ _i , λ _i ) are fixed on the outer faces of said plates (5, 6). Continuous core assembly (A) according to claims 6 and 9, characterized in that a plurality of angles (γ _i , λ _i ) are fixed on each of said plates (5, 6) in line with the periphery of each of said cylinders (β _i ). Continuous core assembly (A) according to claims 7 and 10, characterized in that four angles are fixed on each of said plates (5, 6) in line with the periphery of each of said cylinders (β _i ) of circular section. Mixed-structure structure, characterized by what it includes upper (7) and lower slabs (8) interconnected by at least one core assembly continuous (A1, A2) according to any one of previous claims. Engineering structure according to claim 12, characterized in that said slabs (7, 8) are connected between them by two sets of core (A1, A2) conforming to any one of claims 1 to 10, arranged parallel to each other. Engineering structure according to claim 13, characterized in that the width of said upper slab (7) is greater than that of said lower slab (8), and in that the poaches inclined substantially at 45 ° and forming a V or a W are interposed between said slabs (7, 8). A work of art according to any one of claims 12 to 14, characterized in that said slabs (7, 8) are made of prestressed concrete.

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