CN111836932A

CN111836932A - Anti-seismic device

Info

Publication number: CN111836932A
Application number: CN201980018068.3A
Authority: CN
Inventors: G·奥森达
Original assignee: Kenepirus LLC
Current assignee: Kenepirus LLC
Priority date: 2018-02-06
Filing date: 2019-02-05
Publication date: 2020-10-27
Also published as: US20210156164A1; JP2021514453A; EP3749809B1; WO2019171184A1; EP3749809A1; IT201800002453A1

Abstract

An anti-seismic device (1) for seismic isolation of a structure (2) with respect to a ground (3) is provided, comprising: a first support (4) defining a first support plane (4a) integrally connectable to the upper portion and comprising at least two first hinges (40) defining a first constant reciprocal distance (d'); a second support (5) defining a second support plane (5a) and comprising at least two second hinges (50) defining a second constant reciprocal distance (d "); a third support (6) defining a third support plane (6a) integrally connectable to the lower part and comprising at least two third hinges (60) defining a third constant reciprocal distance (d' "); and-connection means (7) defining a connection plane (7a) perpendicular to said third support plane (6a) and comprising at least two first rigid bars (70), each defining a first non-deformable connection direction (70a), and two second rigid bars (71), each defining a second non-deformable connection direction (71a), wherein said first bars (70) are instantaneously constrained to a first hinge (40) and to a second hinge (50) so that said first connection directions (70a) of said first bars (70) intersect in said connection plane (7a), and wherein said second bars (71) are instantaneously constrained to a second hinge (50) and to a third hinge (60) respectively so that said second connection directions (71a) of said second bars (71) intersect in said connection plane (7 a).

Description

Anti-seismic device

Technical Field

The present invention relates to an anti-seismic device of the type specified in the preamble of the first claim.

In particular, the present invention relates to an anti-seismic joint suitable for absorbing the vibrations of structures and infrastructures of the building type, in order to stabilize said structures in the presence of seismic vibration phenomena.

Background

It is known that at present various anti-seismic solutions are used at the building level, these solutions also being subject to the regulations in force in each country.

For example, on a regular level, some buildings are characterized by a regular hyperstatic structure in plan and height, i.e. forming a compact and symmetrical plane, and in which all resistant vertical systems (such as frames and walls) extend over the entire height of the building.

In addition, the masonry elements include a metal core that allows the structure of the building to have a predetermined deformability before catastrophic collapse is reached.

Furthermore, national regulations generally state that a given elevated structure should employ a single type of foundation unless it is composed of separate units. In particular, the use of pile foundations or mixed foundations and face foundations simultaneously in the same structure must be avoided.

To ensure that the structure can resist seismic activity without significant damage, even relatively strong seismic isolators can be used.

They are located between the foundation and the elevation structure to decouple the seismic frequencies from those of the elevation structure and avoid resonance phenomena. With seismic isolators, the structure remains elastic even during severe earthquakes and retains the energy dissipating capacity provided by ductility.

One example of a seismic isolator is an LRB or lead rubber bearing with a lead core consisting of alternating layers of steel and elastomer connected by vulcanization, which can reduce horizontal displacement due to its high dissipation capacity.

The energy dissipation provided by the lead through its plasticization allows to obtain an equivalent viscous damping coefficient of up to about 30%.

Due to the high dissipation capacity, the horizontal displacement can be reduced compared to an isolation system with the same equivalent stiffness but smaller dissipation capacity.

These seismic isolators are typically circular but may also be made with a square cross-section, possibly with more than one lead.

They are used on buildings, bridges or other structures during construction or seismic adaptation. They ensure the safety of the structure and its contents.

Another type of isolator is provided by buckling-restrained axial-hysteresis dissipaters, e.g. of the type

Series (buckling restrained axial dampers).

These isolators are non-linear seismic devices whose behavior is primarily dependent on displacement. They are particularly suitable for use as dissipative braces for earthquake resistance through energy dissipation, in particular for earthquake adaptation of steel frame buildings. Inserting these devices into the structural grid increases the dissipative capacity of the structure, thus significantly improving its response to earthquakes. Before the point at which yield is reached,

dissipaters increase the stiffness of the structure, an effect which is particularly useful for complying with regulatory requirements that limit movement between layers to damage limit conditions (i.e. to allow structural breakage according to an effective safety margin).

The described prior art has several significant drawbacks.

In particular, the described system, in particular in the case of lead rubber bearings, is characterized by an extremely complex structure adapted to dissipate at least part of the deformation energy generated by seismic phenomena.

These structures are therefore very expensive in terms of cost and make it possible to solve the problem of seismic vibration management only in terms of damage tolerance, i.e. damage tolerance within the damage limit regime resulting from the phenomenon of deformation, sometimes even plastic.

Thus, systems of the previous type described are reactive and irreversible beyond certain seismic thresholds.

Indeed, all devices known from the prior art only play a role in the stiffness of the joint and the support structure.

Disclosure of Invention

In this case, the technical purpose of the present invention is to devise an anti-seismic device capable of substantially overcoming at least some of the drawbacks mentioned.

Within the scope of said technical task, an important object of the present invention is to obtain an anti-seismic device capable of isolating the ground of a building or supporting structure from the ground during, for example, seismic vibration activities, thus limiting the deformation of the device.

Another important object of the invention is to make an anti-seismic device capable of isolating the structure from the vibrations, without interfering only with the rigidity of the support joints of said structure.

In summary, another purpose of the present invention is to achieve an isolation device that is able to reduce the freedom of movement undergone by a structure supported by the ground with respect to the original reference system of said structure.

The technical and specific objects are achieved by an anti-seismic device as claimed in the appended claim 1.

Preferred technical embodiments are described in the dependent claims.

Drawings

The features and advantages of the present invention will become apparent from the following detailed description of the preferred embodiments, in which:

fig. 1 shows a schematic model of a device according to the invention in a free state;

FIG. 2 shows a schematic model of an apparatus according to the invention subjected to seismic stress;

FIG. 3 is an example of embodiment of the device according to the invention in a free state;

FIG. 4 shows an embodiment of the apparatus according to the invention subjected to seismic stress;

FIG. 5 shows an example of a foundation comprising two inventive devices arranged in a coplanar manner;

FIG. 6 shows an example of a foundation comprising four overlapping inventive devices;

figure 7a shows a second embodiment of the device according to the invention in a first configuration;

figure 7b shows a second embodiment of the device according to the invention in a second configuration; and

fig. 7c shows a second embodiment of the device according to the invention in a third configuration.

Detailed Description

In this document, measured values, shapes and geometric references (such as perpendicularity and parallelism) when used with words such as "about" or other similar terms such as "approximately" or "substantially" should be understood to be in addition to measurement errors or inaccuracies due to manufacturing and/or fabrication errors and, most importantly, to the slight deviations of the values, measured values, shapes or geometric references associated therewith. For example, the term, if associated with a value, preferably indicates a divergence of no more than 10% of the value.

In addition, when terms such as "first", "second", "upper", "lower", "primary", and "secondary" are used, they do not necessarily refer to an order, a priority relationship, or a relative position, but may simply be used to more clearly distinguish different components from each other.

Unless otherwise stated, the measurements and data given herein are to be considered as being obtained in the standard international atmospheric ICAO (ISO 2533).

With reference to the figures, numeral 1 indicates as a whole an anti-seismic device according to the invention.

The seismic device 1 is preferably adapted to isolate the structure 2 from the ground 3.

The structure 2 is preferably a building-type structure. Thus, it may be a building, such as a bridge or other type of infrastructure.

In addition, the term "structure" 2 is to be understood not only as an integral structure but also as a part of a structure.

The device 1 may in fact be housed in the foundation of the structure 2, or may be arranged in an intermediate portion thereof. In one example, the apparatus 1 is arranged at the bottom of the foundation of a residential building (i.e. a house). In a second example, the apparatus 1 is arranged below a bridge support tower.

In a third example, the device 1 may be housed in a bridge portion comprising a coupling between a support tower and a transport lane of the bridge itself.

The floor 3 may be any type of bottom, preferably flat.

The surface 3 may be, for example, solid soil or a seabed.

Generally, the device 1 can be connected to an upper part and a lower part.

The lower part may consist of the ground 3. However, it need not be the ground 3, but may be composed of others.

Similarly, the upper part may, but need not, consist of the structure 2.

As mentioned above, in practice, the device 1 may adopt different configurations, for example an arrangement in the middle region of the structure 2.

The structural terms of the device 1 are described in terms of its constituent components after being scientifically modeled. This means, for example, that when referring to hinges and levers, they refer to physical elements that exhibit a behavior similar to the levers and/or hinges, in particular in a two-dimensional plane, but without any limitation as to the actual physical components used.

For example, the hinge may be made of a plurality of joints, just like a rod, which may be referred to as a rod, a beam or in this case suitable for connecting the hinge or other element with its own stiffness in terms of modeling.

The support 1 preferably comprises a first support 4, a second support 5 and a third support 6.

The first support 4, the second support 5 and the third support 6 preferably define a similar form.

Preferably, the first support 4 defines a first support plane 4 a.

The first support 4 is preferably connectable to an upper part, for example to the structure 2 or, in another example, to a third support 6 of the attachment 1.

Thus, the first support plane 4a may consist of an interaction or constraint plane between the first support 4 and the structure 2.

In addition, the first support 4 comprises at least two first hinges 40.

The hinge 40 is preferably made of a mechanical joint that allows the instantaneous connection of other elements. Such mechanical joints may be bolts adapted to preferably allow only a certain degree of transient of other elements, in particular rotation about the hinge.

Such first hinges 40 are further preferably spaced apart from each other to define a first distance d'.

The first distance d' is preferably defined along the first support plane 4 a.

In addition, it is preferably constant, so that the first support 4 defines a rigid rod.

Preferably, the third support 6 defines a third support plane 6 a.

The third support 6 is preferably connectable to a lower part, for example to the ground 3 or to the first support 2 of the second device 1.

The term "lower" as well as the term "upper" used previously are defined with reference to the ground 3 along a vertical direction, for example defined by the acceleration of gravity.

Thus, the third support plane 6a may consist of an interaction or constraint plane between the third support 6 and the ground 3.

Furthermore, the third support 6 comprises at least two third hinges 60.

Also, the third hinge 60 is preferably made of a mechanical joint that allows other elements to be instantaneously connected. Such mechanical joints may be bolts adapted to preferably allow only a certain degree of transient of other elements, in particular rotation about the hinge.

Such third hinges 60 are further preferably spaced apart from each other to define a third distance d' ".

The third distance d' "is preferably defined along the third support plane 6 a.

Furthermore, it is preferably constant, so that the third support 6 defines a rigid bar.

Further, preferably, the distance d '"is equal to the first distance d'. Alternatively, in the example of fig. 7a-7c, the first distance d 'is greater than the third distance d' ", preferably by a percentage in the range of 18% to 25%, more preferably in the range of 21% to 23%.

Preferably, the second support 5 defines a second support plane 5 a.

The second support 5 is preferably connectable to the first support 4 and the third support 6.

Therefore, the first support plane 5a is comprised between the first support plane 4a and the third support plane 6 a.

In addition, the second support 5 comprises at least two second hinges 50. Preferably, in the example of fig. 7A-7c, the second support 5 comprises four second hinges 50, two second upper hinges 50a and two second lower hinges 50 b.

The second hinge 50 is preferably made of a mechanical joint that allows the instantaneous connection of other elements, like the other hinges. Such mechanical joints may be bolts adapted to preferably allow only a certain degree of transient of other elements, in particular rotation about the hinge.

Further, such second hinges 50 are preferably spaced apart from each other to define a second distance d ". Preferably, in the example of fig. 7a-7c, the second support 5 defines a second lower distance d between said second lower hinges 50b₁", and a second upper distance d is defined between said second upper hinges 50a₂”。

The second distance d "is preferably defined along the second support plane 5 a. Furthermore, it is preferably constant, so that the second support 5 defines a rigid rod.

Preferably, the second distance d "the first and third distances d 'and d'" are not equal but smaller than them.

For example, the second distance d "may be at least 3% less, more suitably 5% less, than the third distance d'".

Alternatively, in the example of FIGS. 7a-7c, the second lower distance d₁"less than said first and said third distance d ' and d '", less than the first distance d ' is preferably a percentage in the range of 40% to 50%, and more preferably in the range of 44% to 48%. Furthermore, the second upper distance d is compared to the third distance d' ″₂"greater than said first and said third distances d ' and d '", greater than the third distance d ' "is preferably a percentage between 9% and 15% and more preferably between 11 and 13%.

The device 1 comprises connection means 7.

The connecting means 7 are preferably adapted to connect the

supports

4, 5, 6.

They preferably define a connection plane 7 a. The connection plane 7a is perpendicular to the third support plane 6 a. It is therefore substantially perpendicular to the ground 3 and connects the

supports

4, 5, 6 perpendicularly with respect to the ground.

The connecting means 7 comprise at least two first rods 70 and two second rods 71.

The first rod 70 is preferably substantially rigid. In addition, they each define a first connection direction 70 a.

The first coupling direction 70a corresponds to the main extension of the rod 70 and therefore to the axial direction.

The first connection direction 70a is also non-deformable.

Preferably, the first bar 70 is adapted to constrain the first support 4 and the second support 5.

More specifically, the two first levers 70 are instantaneously constrained to the first hinge 40 and the second hinge 50, respectively, so that the connection directions 70a of the first levers 70 intersect in the connection plane 7 a.

In the example of fig. 7a-7c, the first lever 70 is instantaneously attached to the first hinge 40 and the second upper hinge 50a, respectively, and defines substantially the same geometry as described.

Also, preferably, the second rod 71 is also rigid. In addition, they each define a second connection direction 71 a.

The second connection direction 71a corresponds to the main extension of the rod 71 and thus to the axial direction.

The second connection direction 71a is also non-deformable.

Preferably, the second bar 71 is adapted to constrain the second support 5 and the third support 6.

More specifically, the two second bars 71 are each instantaneously constrained to the second hinge 50 and to the third hinge 60, so that the second connection directions 71a of the second bars 71 intersect in the connection plane 7 a.

In the example of fig. 7a-7c, the second bar 71 is instantaneously constrained to the second lower hinge 50b and to the third hinge 60, respectively, and defines substantially the same geometry as described.

The first bar 70 and the second bar 71 are preferably identical to each other, but may also be different.

The device 1 therefore defines, substantially and preferably, at least in the free state, two superposed and corresponding similar mirror-image structures with respect to the second support plane 5 a.

These structures are given by the first support 4, the first bar 70 and the second support 5, the second bar 71 and the third support 6.

In the example of fig. 7a-7c, the distance between the first hinge 40 and the second upper hinge 50a in the vertical direction and in the aligned configuration (fig. 7a) is preferably very close to the first distance d', and preferably differs therefrom by less than 3%, more preferably by less than 1%. In addition, the distance between the second lower hinge 50b and the third hinge 60 in the vertical direction and in the aligned configuration (fig. 7a) is preferably greater than the third distance d' ", preferably a percentage between 12% and 20%, more preferably between 15% and 17%.

These structures are also substantially similar to the articulated quadrilateral or "chebyshev guide" used in the "straight" section when the side bars are crossed.

As already mentioned, the device 1 preferably defines a free state and at least one stressed state.

In the free state, the device 1 is free with respect to seismic stresses, and the first 4a, second 5a and third 6a support planes are parallel to each other. In this state, the device 1 is adapted to support the superstructure.

In the stressed state, the device 1 is stressed by means of seismic stresses defining at least one displacement x.

For example, a displacement x is provided along the third support plane 6a and parallel to the connection plane 7a, so as to allow the device 1 to move according to the displacement x.

In detail, the first support 1 is subjected to a displacement x due to seismic stresses on the ground 3, and therefore all the

supports

5, 6 arranged above follow the movement.

Structurally, the device 1 described so far in two-dimensional model may comprise a plurality of pairs of first and

second bars

70, 71.

These first and

second bars

70, 71, mutually coupled to the other first and

second bars

70, 71, are preferably parallel to the latter and arranged along parallel and spaced-apart connection planes 7 a.

In addition, the

supports

4, 5, 6 may form or comprise a plurality of different structural elements.

For example, the first support 4 may include a first support bar 41, the second support 5 may include a second support bar 51, and the third support may include a third support bar 61.

In this configuration, the support rods 41, 51, 61 are preferably rigidly connected to the

hinges

40, 50, 60, respectively.

This configuration can be used for a device 1 that extends vertically in two dimensions (i.e. mainly along the connection plane 7a) and has two first bars 70 and two second bars 71.

In particular, the device 1 may comprise a first bar 70 and a second bar 71 connected to adjacent pairs of support bars 41, 51, 61.

In this case, the

hinges

40, 50, 60 comprise spacers suitable for connecting the pairs of support bars 41, 51, 61 and bars 70, 71, and the device 1 is substantially made of two structures, as described in the previous configurations, which are adjacent and constrained in a similar mirror-image manner.

Alternatively, the device 1 may comprise a first support plate, a second support plate and a third support plate.

In detail, the first support 4 may include a first support plate, the second support 5 may include a second support plate, and the third support may include a third support plate.

The support plates are preferably coplanar with the

support planes

4a, 5a, 6a, respectively, and are adapted to be connected to the

hinges

40, 50, 60, respectively. Such support plates may also be connected by two first bars 70 and two second bars 71, or by a plurality of pairs of

bars

70, 71.

Preferably, as already mentioned, the device 1 is suitable for use in an anti-seismic foundation for a structure of building type.

In this case, the seismic ground comprises at least one device 1 and a part of a general structure 2.

The device 1 may thus be arranged between two structure parts 2 or between the ground and a structure part 2, typically a foundation.

The foundation comprising the device 1 may further provide different configurations.

They may comprise a single or a plurality of devices 1.

For example, the foundation may comprise a plurality of devices 1, wherein all the respective third support planes 6a are coplanar.

Furthermore, all the first support planes 4a are preferably also coplanar.

Such a configuration is shown, for example, in fig. 5.

In addition, the earthquake-resistant foundation may comprise a plurality of devices 1 arranged in series in an overlapping manner, and wherein, i.e. one of the third support planes 6a is integral with the lower part (e.g. the ground 3), one of the first support planes 4a is integral with the upper part (e.g. the structure 2), and the other first and

third support planes

4a, 6a are integral with each other.

In addition, preferably the devices 1 do not overlap along the coplanar connection planes 7a, but each device 1 defines at least one free connection plane 7a that is inclined with respect to the connection planes 7a of the other devices 1, allowing the foundation to absorb a plurality of displacements x connected to seismic stresses in different directions along the connection planes 7a, as shown in fig. 6.

For example, preferably, the foundation may comprise four devices 1 overlapped to realize a column in which each device 1 defines a connection plane inclined with respect to the adjacent plane, the inclination preferably being equal to 45 °. In this case, the device 1 may preferably have an octagonal perimeter.

In this way a foundation is created that can absorb seismic stresses from the ground 3, with displacements of x-in four different directions.

Even two overlapping devices 1 defining mutually perpendicular connection planes 7a are sufficient to dampen all coplanar forces, since the forces can always be separated along two perpendicular axes.

The function of the device 1 described above in terms of structure is as follows.

When in the free state, all the

support planes

4a, 5a, 6a are parallel to each other and the

bars

70, 71 preferably intersect at a point included in the geometric axis of the device 1.

When the device 1 is transformed from the free state to the stressed state due to the seismic stress exerting a displacement x on the first support 4, it will undergo a displacement x if the first support 4 is parallel to the connection plane 7 a.

When the first support 4 moves and normally vibrates, the intersection of the

bars

70, 71 is offset from the axis of the device 1 and the second support plane 5a is inclined in correspondence with the inclination of the second bar 71.

Similarly, the first lever 70 and the first support plane 4a are inclined with respect to the second support plane 5 a.

If the first support plane 4a and the third support plane 6a are integrally constrained to an upper portion and a lower portion, respectively, characterized by a sufficient value of moment of inertia, the limits of which are easily detectable according to the dimensions of the device 1 from experimental tests, the first support 4 and the third support 6 remain parallel during the movement of the device 1.

In this case, the

support planes

4a, 6a remain parallel, and only the second support plane 5a is tilted together with the

rods

70, 71 performing the opposite rotation. More specifically, when the second support plane 5a rotates, the support plane can only translate reciprocally along a plane parallel to the ground 3 or along a direction perpendicular to the ground 3.

However, for low intensity or low amplitude vibrational stresses, the latter motion is extremely limited and negligible.

The device 1 thus allows to obtain a substantial "floating" effect when the structure 2 is subjected to seismic stresses present on the ground 3.

The device 1 according to the invention has important advantages.

In fact, the device 1 allows to absorb the stresses deriving from the seismic activity in a dynamic and mechanical way, i.e. without resorting to easily deformable elements.

The device 1 therefore allows to absorb the movements and displacements x imposed by the seismic stresses, not only due to the rigidity of the constituent elements, but also due to the kinematic mechanisms included in the device 1.

In fact, with regard to the dimensions and the conformation of the device 1 or of the foundation comprising it, the modes of vibration of the seismic stresses can be completely absorbed by the relative movement of the first support plane 4a with respect to the third support plane 6 a.

This absorption takes place in a completely stable manner, since the device 1 tends to return to the free state when it is not under force. The free state achieved by the device 1 is therefore a stable equilibrium state.

In summary, the device 1 allows, for example, to reduce the freedom of movement to which the structure 2 is subjected with respect to the ground 3, since it is not allowed to rotate about an axis parallel to the first support plane 4 a.

Changes may be made to the invention as described herein without, however, departing from the scope of the inventive concept as defined in the accompanying claims.

For example, the

supports

4, 5, 6 may be constrained together by elastic elements and/or dampers adapted to control and, if necessary, modify the dynamic response of the device 1 to seismic stresses.

Examples of embodiments of this type are shown in fig. 3 and 4.

Preferably, such elastic element may be a common spring and the damper may be of the hydraulic type, and a configuration may be provided in which, for example, the first hinge 40 is connected to the second hinge 50 through said elastic element and/or damper, the second hinge 50 in turn being connectable to the third hinge 60.

These may be of the passive or active type. The device 1 can also actively compensate for seismic motion.

All the details may be replaced with equivalent elements within the scope, and the materials, shapes and dimensions may be as required.

Claims

1. An anti-seismic device (1) for seismic isolation of a structure (2) with respect to a ground (3), characterized by comprising:

-a first support (4) defining a first support plane (4a) that is integrally connectable to an upper portion, such as the structure (2), and comprising at least two first hinges (40) defining a first constant reciprocal distance (d');

-a second support (5) defining a second support plane (5a) and comprising at least two second hinges (50) defining a second constant reciprocal distance (d ");

-a third support (6) defining a third support plane (6a) that can be integrally connected to a lower part, for example the ground (3), and comprising at least two third hinges (60) defining a third constant reciprocal distance (d' "); and

-connection means (7) defining a connection plane (7a) perpendicular to said third support plane (6a) and comprising at least:

-two first rigid bars (70), each defining a first non-deformable connection direction (70a) and adapted to constrain said first support (4) and said second support (5), and

-two second rigid bars (71), each defining a second non-deformable connection direction (71a) and adapted to constrain said second support (5) and said third support (6),

-said first bars (70) are each instantaneously constrained to one of said first hinges (40) and to one of said second hinges (50) so that said first connection directions (70a) of said first bars (70) intersect in said connection plane (7a), and

-said second bars (71) are each instantaneously constrained to one of said second hinges (50) and to one of said third hinges (60) so that said second connection directions (71a) of said second bars (71) are crossed in said connection plane (7 a).

2. The device (1) according to claim 1, wherein the first distance (d ') and the third distance (d' ") are equal and the second distance (d") is smaller than the first and third distances (d ', d' ").

3. The device (1) according to any one of the preceding claims, wherein the second distance (d ") is at least 3% smaller than the third distance (d'").

4. Device (1) according to any one of the preceding claims, wherein said supports (4, 5, 6) and said connection means (7) define at least two superimposed "chebyshev guides".

5. Device (1) according to any one of the preceding claims, comprising a plurality of pairs of said first and second bars (70, 71) parallel to each other along parallel and spaced apart connection planes (7 a).

6. Device (1) according to any one of the preceding claims, wherein said supports (4, 5, 6) each comprise at least one support bar (41, 51, 61) respectively adapted to rigidly connect said hinges (40, 50, 60).

7. Device (1) according to any one of the preceding claims, wherein said supports (4, 5, 6) each comprise at least one support plate (42, 52, 62) respectively coplanar with said support plane (4a, 5a, 6a) and respectively adapted to rigidly connect said hinge (40, 50, 60).

8. Device (1) according to any one of the preceding claims, comprising two pairs of two second hinges (50).

9. An anti-seismic foundation of a structure (2), comprising a device (1) according to any one of the preceding claims and at least a portion of said structure (2), said structure (2) being a building-type structure.

10. An anti-seismic foundation according to the preceding claim, comprising a plurality of said devices (1), wherein said respective third support planes (6a) are all coplanar.

11. An anti-seismic foundation according to any one of the preceding claims, comprising a plurality of said devices (1), wherein said devices (1) are arranged in succession overlapping, one of said third support planes (6a) being integral with the lower portion, one of said first support planes (4a) being integral with the upper portion, said other first (4a) and third (6a) support planes being integral with each other, and each of said devices (1) defining at least one of said connection planes (7a) which is inclined with respect to said connection plane (7a) of said other device (1), so as to allow said foundation to absorb a plurality of seismic stresses (x) in different directions along said connection plane (7 a).