EP3073018A1 - Anti-seismic brace system for securing the concrete foundations of a structure - Google Patents

Abstract

The present invention relates to an anti-seismic pulling system (1) for joining at least two concrete foundations (2a, 2b) of a structure. According to the invention, the system (1) comprises at least one geotechnical bar (4) comprising a helical aliasing, said bar being intended, on the one hand, to be inserted at a first end (9) into a through bore (3). ) formed in a first concrete foundation (2a) and, on the other hand, to be embedded at a second end (13) in a second concrete foundation (2b), said geotechnical bar (4) comprising: - At the first end (9), a plate (11) provided with an orifice (7) for the insertion of the geotechnical bar (4), said plate (11) being intended to bear against an outer face the first foundation (2a) of concrete, and a spherical nut (12) screwable around the geotechnical bar (4) to hold said plate (11) in the support position, - At the second end (13), an anchoring means (14, 15, 16) in the second foundation (2b) of concrete.

Description

TECHNICAL AREA

The present invention relates to an anti-seismic pulling system for securing concrete foundations of a structure, such as an industrial building for example.

PRIOR ART

In the field of building, it is known to use concrete tie rod systems in conventional weapons to resume traction efforts that could suffer an industrial building following an earthquake.

However, the types of known reinforced concrete tie rod systems are relatively fragile so that during construction, said tie rods are likely to deform or even break due to the displacement of relatively heavy gear on said tie rods. During the progress of a construction site, said systems of reinforced concrete tie rods of the state of the art are a permanent inconvenience for construction machinery and networks to achieve sub-paving.

SUMMARY OF THE INVENTION

One of the aims of the invention is therefore to remedy these drawbacks by proposing an anti-seismic pulling system for the fastening of the concrete foundations of a structure that optimally responds to seismic standards, while being more solid, easier to implement, less restrictive, and lighter than those of the state of the art.

Another object of the invention is to provide such an anti-seismic pulling system which allows a final assembly and a perfect tensioning, made at the end of the earthworks and networks, without any hindrance for the machines carrying out earthworks and embankments for the building sites.

• au niveau de la première extrémité, une plaque pourvue d'un orifice pour l'insertion de la barre géotechnique, ladite plaque étant destinée à prendre appui contre une face externe de la première fondation en béton, et un écrou sphérique apte à être vissé autour de la barre géotechnique pour maintenir ladite plaque en position d'appui,
• au niveau de la deuxième extrémité, un moyen d'ancrage dans la deuxième fondation en béton.

For this purpose and in accordance with the invention, it has been developed an anti-seismic pulling system for the joining of at least two concrete foundations of a structure, remarkable in that it comprises at least one geotechnical bar, preferably high-adhesion steel, comprising a helical aliasing, preferably in the left-hand pitch, said bar being intended, on the one hand, to be inserted at a first end into a through bore formed in a first concrete foundation and, d on the other hand, to be drowned at a second end in a second concrete foundation, said geotechnical bar comprising:

• at the first end, a plate provided with an orifice for the insertion of the geotechnical bar, said plate being intended to bear against an outer face of the first concrete foundation, and a spherical nut adapted to be screwed around the geotechnical bar for holding said plate in the support position,
• at the second end, an anchoring means in the second concrete foundation.

In this way, the anti-seismic tie rod system according to the invention makes it possible to take up the tensile forces that could be experienced by a structure, such as an industrial building following an earthquake. The implementation of a geotechnical bar makes it possible to lighten the system compared to conventional reinforced concrete rods of the prior art. In addition, the geotechnical bar comprises a circular section provided with a helical alias which makes it advantageously screwable. Said geotechnical bar used is in particular devoid of longitudinal ribs.

The anti-seismic pulling system according to the invention is also advantageous in that it comprises a spherical nut capable of taking up the misalignment between the plate and the concrete foundation. As a result, the transfers of forces and loads are efficiently distributed along the geotechnical bar to respond optimally to seismic standards. The loads are ideally distributed so that the geotechnical bar can have reduced dimensions compared to the rods of the state of the art, especially in terms of diameter, for a load recovery equivalent. As a result, the system is lighter, less constraining to implement, and less cumbersome which facilitates the passage of networks during a construction site.

According to a particular embodiment of the anti-seismic pulling system according to the invention, and in particular to resume the compressive forces that could be experienced by an industrial building following an earthquake, said system comprises a counter plate, arranged at the first end the geotechnical bar, intended to support an inner face of the first concrete foundation to make a counter-support relative to the plate, and a counter-nut adapted to be screwed around the geotechnical bar to maintain said counterplate in support position.

Advantageously, and to facilitate the implementation of the anti-seismic tie rod system on site, the locknut is spherical to prevent the ball nut is placed in place of the locknut.

Depending on the spacing of the concrete foundations to be joined, the anti-seismic tie rod system may comprise a plurality of geotechnical bars, and at least two, coupled through a sleeve held in position by means of two screwed spherical nuts. on either side of said sleeve.

Advantageously, and to further facilitate the implementation of the anti-seismic tie rod system on site, the sleeve comprises means for centering the two geotechnical bars in the form of an orifice in the center of the sleeve receiving a screw forming a stop when the two geotechnical bars are inserted into said sleeve.

According to different embodiments, the anchoring means in the second concrete foundation is in the form of an anchor screwed to the second end of the geotechnical bar.

Said anchoring means may be made by the second end of the geotechnical bar divided into two parts extending in opposite directions, or folded to form a butt.

Advantageously, the geotechnical bars have undergone anti-corrosion treatment of the hot-dip galvanizing type, or electro-galvanizing, or lamellar galvanizing.

Advantageously, and in order to avoid the deflection of the geotechnical bar or bars, during the installation of an embankment for example, the geotechnical bar or bars are inserted in plastic sheaths.

SUMMARY DESCRIPTION OF THE FIGURES

• la figure 1 est une représentation schématique illustrant un montage d'un premier mode de réalisation du système de tirant antisismique selon l'invention pour solidariser deux fondations en béton ;
• la figure 2 est une représentation schématique similaire à celle de la figure 1, illustrant un montage d'un deuxième mode de réalisation du système de tirant antisismique selon l'invention ;
• la figure 3 est une représentation schématique similaire à celle de la figure 1, illustrant un montage d'un troisième mode de réalisation du système de tirant antisismique selon l'invention.

Other advantages and features will become more apparent from the following description, given by way of non-limiting example, of the anti-seismic tie rod system according to the invention, from the appended drawings in which:

• the figure 1 is a schematic representation illustrating a mounting of a first embodiment of the anti-seismic tie rod system according to the invention for securing two concrete foundations;
• the figure 2 is a schematic representation similar to that of the figure 1 , illustrating an assembly of a second embodiment of the anti-seismic tie rod system according to the invention;
• the figure 3 is a schematic representation similar to that of the figure 1 , illustrating a mounting of a third embodiment of the anti-seismic tie rod system according to the invention.

DETAILED DESCRIPTION OF THE INVENTION

With reference to Figures 1 to 3 the invention relates to an anti-seismic pulling system (1) for joining at least two concrete foundations (2a, 2b) of a structure, such as an industrial building, to respond optimally to seismic standards, by taking again the efforts of compression-traction that could undergo this work following an earthquake.

To simplify the description, the invention will be described below, for securing a first foundation (2a) of concrete comprising a through bore (3) with a second foundation (2b) of concrete, cast after the establishment of the pulling system (1) according to the invention.

After pouring the second foundation (2b), the pulling system (1) in place is energized to allow the resumption of compression-traction forces between the two foundations (2a, 2b).

The pulling system (1) according to the invention comprises a plurality of geotechnical bars (4), coupled to each other to adapt to the distance between the two foundations (2a, 2b) of concrete to be joined.

The geotechnical bars (4) are preferably high-adhesion steel bars of circular cross-section comprising a helical aliasing in the left-hand pitch. The geotechnical bars (4) have no longitudinal ribs and have advantageously undergone anti-corrosion treatment such as hot-dip galvanizing, or electro-galvanizing, or lamellar zinc coating. In a preferred embodiment, illustrated in the figures, the geotechnical bars (4) used are bars known under the name "GEWI" (registered trademark), type "B500B", 32 millimeters in diameter. Said geotechnical bars (4) used are, of course, certified by an official body capable of certifying concrete reinforcements and issuing certificates of conformity, such as AFCAB, for example. Preferably, and to avoid the deflection of the geotechnical bars (4) during the subsequent placement of an embankment for example, they are inserted into plastic sleeves (5), well known to those skilled in the art. under the name "Janolene" (Registered Trade Mark).

To adapt to the distance between the two concrete foundations (2a, 2b), said geotechnical bars (4) are joined together by means of sleeves (6) making it possible to ensure the seismic mechanical continuity along said geotechnical bars ( 4). Said sleeves (6) are held in position by means of two spherical nuts (6a) screwed on either side of the sleeves (6). The spherical part of the nuts (6a) is in support against the sleeve (6). The two geotechnical bars (4) are inserted in the sleeve (6) centrally. For this purpose, each sleeve (6) comprises an orifice (7) formed in the center of the sleeve (6), which orifice (7) receives a screw projecting inside the sleeve (6) to form a stop during inserting the two geotechnical bars (4) into said sleeve (6). In other words, the two geotechnical bars (4) are inserted into the sleeve (6) to the stop, guaranteeing a simple, fast and optimal centering.

The spherical nuts (6a) are then screwed to secure the plurality of geotechnical bars (4) and make monobloc sleeve.

A spherical counter-nut (8) is then screwed to a first end (9) of the plurality of geotechnical bars (4), the spherical head of said counter-nut (8) is turned towards said first end (9). The counter-nut (8) is screwed onto the bar (4) until a sufficient distance is left for the insertion of the plurality of geotechnical bars (4) through the bore (3) of the first foundation (2a). ). Prior to the actual insertion, a counter-plate (10) is inserted around the first end (9) of the plurality of geotechnical bars (4) until it abuts against the spherical counter-nut (8).

Then, said first end (9) of the plurality of spliced geotechnical bars (4) is inserted into the through bore (3) of the first foundation (2a), and held in position by the insertion around said first end (9), a plate (11), and by screwing a spherical nut (12) for locking in position.

After insertion, the spherical nut (12) arranged at the first end (9) of the plurality of geotechnical bars (4) is tightened to hold the plate (11) against the outer face of the first foundation (2a). Advantageously, and to ensure the setting of net over the entire length of the spherical nut (12), it is necessary to let two nets exceed the first end (9) of the plurality of geotechnical bars (4) of said spherical nut (12). ).

The spherical counter nut (8) is then tightened to lock the assembly and tension the pulling system (1) according to the invention. Tightening the lock nut spherical (8) allows to maintain the against-plate (10) bearing against the inner face of the first foundation (2a).

The pulling system (1) is in place, it is now necessary to pour the second foundation (2b) to embed a second end (13) of the plurality of geotechnical bar (4).

For optimal anchoring and with reference to figure 1 this second end (13) comprises anchoring means in the form of an anchor (14) screwed to said second end (13) of the geotechnical bar.

With reference to the figure 2 said anchoring means may be formed by the second end (13) of the plurality of folded geotechnical bars (4) to form a butt (15), or with reference to the figure 3 divided into two parts (15) extending in opposite directions.

When the second foundation (2b) is solidified, the pulling system (1) plays its role and secures the two foundations (2a, 2b) between them to resume the tensile stresses that could undergo the structure following an earthquake.

The transfers of forces and loads are efficiently distributed along the geotechnical bars (4) to optimally meet the seismic standards. The loads are ideally distributed, the geotechnical bars (4) have dimensions reduced compared to tie rods of the state of the art, especially in terms of diameter for equivalent load recovery. As a result, the pulling system (1) according to the invention is lighter, less constraining to implement, and less cumbersome than those of the state of the art, which facilitates the passage of the networks during a construction site.

Thus, it follows from the foregoing that the invention provides anti-seismic pulling system (1) for securing concrete foundations (2a, 2b) of a structure that optimally responds to seismic standards. This new assembly is, moreover, easier to implement, less restrictive, and lighter than those of the state of the art.

The invention provides such an anti-seismic pulling system (1) whose final assembly and perfect tensioning are performed at the end of the earthworks and networks, without any hindrance to the equipment performing earthworks, backfilling for construction sites.

Claims (10)

Firing seismic system (1) for interlocking at least two foundations (2a, 2b) in a concrete structure, characterized in that it comprises at least a geotechnical bar (4) comprising a helical aliasing, said bar being intended, on the one hand, to be inserted at a first end (9) into a through bore (3) formed in a first concrete foundation (2a) and, on the other hand, to be embedded at a second end ( 13) in a second concrete foundation (2b), said geotechnical bar (4) comprising: - At the first end (9), a plate (11) provided with an orifice (7) for the insertion of the geotechnical bar (4), said plate (11) being intended to bear against an outer face the first foundation (2a) of concrete, and a spherical nut (12) screwable around the geotechnical bar (4) to hold said plate (11) in the support position, - At the second end (13), an anchoring means (14, 15, 16) in the second foundation (2b) of concrete. Anti-seismic tie rod system (1) according to claim 1, characterized in that it comprises a counterplate (10), arranged at the first end (9) of the geotechnical bar (4), intended to support the an inner face of the first foundation (2a) made of concrete to make a counter-support relative to the plate (11), and a counter-nut (8) adapted to be screwed around the geotechnical bar (4) to maintain said against -plaque (10) in the support position. Anti-seismic tie rod system (1) according to claim 2, characterized in that the counter-nut (8) is spherical. Anti-seismic tie rod system (1) according to any one of Claims 1 to 3, characterized in that it comprises at least two geotechnical bars (4) which are coupled together by means of a sleeve (6) held in position by means of two spherical nuts (6a) screwed on either side of said sleeve (6). Anti-seismic tie rod system (1) according to claim 4, characterized in that the sleeve (6) comprises means for centering the two geotechnical bars (4) in the form of an orifice (7) in the center of the sleeve (6) receiving a screw forming a stop during the insertion of the two geotechnical bars (4) in said sleeve (6). Anti-seismic tie rod system (1) according to one of Claims 1 to 5, characterized in that the anchoring means in the second concrete foundation (2b) is in the form of an anchoring piece (14). ) screwed to the second end (13) of the geotechnical bar (4). Anti-seismic tie rod system (1) according to one of Claims 1 to 5, characterized in that the anchoring means in the second concrete foundation (2b) is formed by the second end (13) of the geotechnical bar ( 4) folded to form a butt (15). Anti-seismic tie rod system (1) according to one of Claims 1 to 5, characterized in that the anchoring means in the second concrete foundation (2b) is formed by the second end (13) of the geotechnical bar ( 4) divided into two parts (16) extending in opposite directions. Anti-seismic tie rod system (1) according to any one of Claims 1 to 8, characterized in that the geotechnical bar or rods (4) have undergone anti-corrosion treatment of the hot-dip galvanizing, electro-galvanizing or lamellar galvanizing type. Anti-seismic tie rod system (1) according to one of Claims 1 to 9, characterized in that the geotechnical bar or bars (4) are inserted into plastic sleeves (5).

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