FR2562108A1 - PROCESS FOR THE CONNECTION OF THE END OF ARTWORK TO THE PAVEMENT AND THE FILLING OF WORKS. - Google Patents

Abstract

1. Process for ensuring a tight and strong binding between the ends of a work of art such as bridge or similar, and the main roadway into line (5) which covers the embankment (7), characterized by the placing in position of a concrete body or unit block (8) in the free transition space between the unity embankment-roadway and the supporting end pier (1) and by the use, as composition for joint between the coating (4) of the super structure (2) of the bridge and the superdicial material (4) of the road, of a mastic (10) comprising a mixture of 75-80 % (in weight) of granulates of mean diameter 4 to 20 mm and 25 to 20 % (in weight) of binding bitumen/elastomer vulcanized with sulfur having good mechanical and viscoelasticity features up to low temperatures of less 208C.

Description

The present invention relates to the field of construction

  bridges and the like and pavement coverings. It concerns everything

  especially a method for connecting the ends of openings

  arts, such as bridges, viaducts ... etc, to the main road fart embankment of these works. It is known that, during the construction of bridges, for example highway or other, there is a problem with the joints of

  apron and connecting joints at the ends of the door.

  ge to the main roadway that extends upstream and downstream of the structure.

  Indeed, the location of these joints is weak points where cracks appear frequently due to the variations of

  atmospheric conditions only when heavy vehicles pass. This pro-

  bleme is particularly acute in the stacks of extremities

  which are generally free of transition slabs.

  Various solutions have been proposed to solve such a problem.

  pale. In general, "comb" type gaskets are provided by toothed metal elements which lock into each other to give load-resistant interlacing. This solution is expensive and difficult to implement. According to other techniques, saiones are produced on the surface material of the roadway and the apron and these voids are filled with cold-setting binders and fillers compositions intended to form the connecting joint, for example mention may be made in this regard of European Patent No. 0.000642 of 1977, issued in 1981, according to which a mixture of granular fillers is used as a joint composition.

  and a binder of bitumen and rubbery waste in which the proportion

  binder is at least 30% (by volume).

  The performance of such joints or dressings, including those

  the aforementioned patent, are most often limited, in particular

  bind at low temperature. For example, bitumen and rubber waste mixtures give rise to rigid compositions that do not support

  not, or very badly, winter temperatures from -10 to -20 C.

  their, the realization of such joints can not palliate the absence of transition slabs and embankment degradations that occur

  inevitably to the right of the joint and the stacks of support to the ex-

tremities of the work of art.

  The object of the invention is to obviate these various disadvantages and

2 2562108

  propose a solution to this effect

  and resistant in terms of mechanical characteristics as well as

  it is held at very low temperatures, between the ends of a structure and the main alignment road that covers the embankment on each side of the structure. In accordance with the main and general feature of the method of the invention, a unitary block or unit block is set up.

  concrete / in the free space of transition between the embankment and

  and the support stack at the end of the structure and is also used as a joint composition between the deck covering of

  the structure and surface material of the roadway, a putty

  killed by a mixture of 75 to 80% (weight) of aggregates of average diameter 4 to 20 mm and 25 to 20% (weight) of bitumen binder / elastomer vulcanized with sulfur. Bitumen / elastomer binders have been known per se for many years (see for example French Patent No. 1,557,193 and more recent patents for variants and improvements). They have the advantage of maintaining their flexibility and elasticity up to

  temperatures of about -20 C and having elongations before rup-

  much higher than those of bitumens / rubber. Thus, it is possible to reduce the amount of binder, in a joint composition, to levels of 20 to 25% (weight), which makes it possible to save

  substantial compared to the connection methods known to date.

  Any known composition in which the elastomer is based on conjugated diolefins, for example styrene and butadiene, may be used as sulfur-vulcanized bitumen / elastomer. Nonlimiting examples include, for example, coating compositions and

  mastics for asphalt mixes described in French Pat.

  10987 and European 0020203. However, it has proved to be even more

  tageux to use compositions of the type described in the more recent French Patent No. 82.16433 of the Applicant, in which the base elastomer is constituted by a mixture of styrene-butadiene-styrene copolymer

  (SBS) and ethylene-vinyl acetate copolymer (EVA).

  According to another advantageous characteristic of the invention

  the massive, which serves as a transition support between the stack of

  mite and the embankment of the work, is poured into an envelope

6 2 1 0 8

  protective layer of synthetic nonwoven fabrics. This envelope

  acts as a protective and insulating material for the replacement

  blai and the end stack of the book.

  Other features will appear by the description more

  of an embodiment illustrated in the single appended figure, which shows a schematic sectional view of the connection zone between a bridge end stack, for example a bridge, and the

  traffic pavement in alignment.

  The support stack 1 of the structure supports the deck 2 by

  a flexible element 3 capable of absorbing vibrations, constituting

  killed for example by neoprene plates or similar material. The neck-

  tread 4, for example made of bituminous concrete, is available

  on deck 2 and also constitutes the surface coating of

  the main alignment roadway 5 which has been represented in 6

  basic training. The embankment of the work is represented by Xe figure 7.

  According to a first characteristic of the invention, a block 8 of lean concrete (aggregates + hydraulic binder) is cast in the free space, illustrated in the center of the figure, within a rigid ply 9 made of synthetic nonwoven fabric. whose bottom and edges serve as envelope for the block and intermediate insulation for the stack 1 and its deck 2 as well as with respect to the embankment 7 and the body of the roadway 6. This provides a transition mass allowing to ensure an excellent behavior, over time, of the connection zone of the structure

on the road.

  According to the other essential characteristic of the invention, the seal 10 ensuring the connection of the pavement elements 4 consists of a "cyclopean" type mastic composed of a mixture of about 80% of pebble aggregates 10 / 14 or 6/14 and about 20% of a sulfurized vulcanized bitumen / elastomer composition corresponding to the formulations of Examples 3 or 4 of the aforementioned French Patent No. 82. 16433. In practice, in a manner known per se, sawing the wearing course 4 over a length of about 20 to 30 cms and then

  The above composition is heated and allowed to cool and then harden before

  ge. The thickness of the sealant is the same as that of the wearing course (generally 5 to 10 cms) and the width is at least three times this thickness and in no case less than fifteen centimeters. Thanks to the implementation of such a mastic, of great flexibility and elasticity, it is possible to absorb movements of the deck of at least three centimeters to magnitude and this up to temperatures of

the order of -20 C.

  In addition, according to an advantageous feature of implementation

  vre, it is expected the establishment, before casting sealant joint, a seal 11 (for example aluminum foil or other) to prevent infiltration to the right of the battery 1 and the block

  8 and essentially at the level of the envelope 9 of the latter.

  Of course, other embodiments can be envisaged within the scope of the invention, as defined in the

following claims.

2562108

Claims (4)

CLAIMS I   1. Process for ensuring a tight and resistant connection   between the ends of a structure, such as a bridge or the like, and the main aligning roadway (5) covering the embankment (7) of the structure, characterized in that one sets up a concrete block or block (8) made of concrete in the free transition space between the embankment-ground assembly and the end support stack (1) of the structure and in that one uses, as composition for a joint between the coating (4) of the deck (2) of the structure and the surface material (4) of the   a mastic (10) consisting of a mixture of 75 to 80% granular   lats of average diameter 4 to 20 mm and 25 to 20% (weight) of bitumen binder / elastomer vulcanized with sulfur, good mechanical characteristics and   viscoelasticity up to low temperatures of minus 20 C.   2. Method according to claim 1, characterized in that the mass (8) serving as a transition support, made of lean concrete, is cast inside a protective envelope (9) of nonwoven synthetic fabric webs ,! aquelle serves as insulation material for   the embankment and the end stack of the structure.   3. Process according to any one of claims I eb 2,   characterized in that the elastomer of said binder is constituted by a   styrene-butadiene-styrene copolymer and ethylene-copolymer copolymer vinyl acetate.   4. Process according to any one of Claims 1 to 3,   characterized in that a seal cover (11) is provided at the base of the seal opening (10) in the pavement (4) in the area where the protective casing ( 9) of the massif (8) of transition.