FR2682412A1 - A device for inspectable, demountable and adjustable spring boxes for the low-frequency filtering of floating floors - Google Patents

Abstract

Device making it possible to implement floating floors intended to provide active or passive vibrational filtration. The invention relates to pointwise low-frequency elastic supports made up of coil-spring boxes. These spring boxes are installed when the floor is poured (cast), the springs, which are preloaded beforehand, are used for raising the construction by progressive release. The spring boxes can be inspected, dismantled, and adjusted for levelling the floor.

Description

DESCRIPTION

  With modern construction techniques (reduction in floor thicknesses, increased spans, development of curtain walls, generalization of air conditioning equipment, J the problems of transmission of vibrations have developed. When these vibration and acoustic nuisances are deemed unacceptable for the use of a room, a machine or an equipment, it is possible to globally separate the floors concerned This principle also makes it possible to install hectic machines on suspended slabs, thus filtering the

vibration at the source.

  The present invention relates to a device allowing the implementation of such floating floors. These consist of a concrete slab resting on helical spring boxes, sized according to static loads, overloads and excitations to be filtered. The technique prior to the present invention for the implementation of floating slabs consists in pouring concrete onto plates or elements made of synthetic materials with limited and poorly understood elastic characteristics, the peripheral joint of the room being produced in the same materials. technique does not allow to obtain natural frequencies of installation sufficiently low to guarantee a good filtering The elastic elements are neither visitable nor interchangeable, therefore, difficult to adjust Furthermore, during the implementation of the 'rigid bridges' create between primary floor and floating slab These hard points favor

solidary transmission.

  The present process offers the advantage of guaranteeing practical natural frequencies of installation in accordance with the theoretical frequencies determined by calculation: The characteristics of the helical spring are indeed known and

stable over time.

  The floating floor of the present invention is completely

  disconnected from the primary slab.

  The helical spring boxes can be visited and adjusted and therefore allow the characteristics of the suspension to be varied.

  depending on any change in expenses.

DESCRIPTION

  The floating floor of the present invention may be intended to provide either "active" filtering (for example air conditioning technical room) or "passive" filtering (for example protection against acoustic and vibration nuisances of metropolitan networks, rail and road or with regard to equipment

various techniques).

  The present invention describes a device which makes it possible to obtain, by occasional presses, low frequency settings and therefore very high filtering performance, while retaining for

  O the civil engineering company facilitates implementation.

  A non-uniform distribution of the elastic supports makes it possible to easily take up point loads (machines> or peripheral loads (partitions) without increasing the stresses in the floating floor. The 3 attached figures describe the present invention: FIG. 1 represents the spring box ( videj during the pouring of the concrete. Figure 2 illustrates the installation of the prestressed spring after

drying of the slab.

  Figure 3 shows the floor lifting and adjusting operation.

  The device of the present invention therefore consists of helical spring boxes (3 integrated into the floor Q during the pouring of the concrete, the primary slab Q serving as formwork The ground is covered with two polyethylene films before the pouring to avoid any parasitic connection. Q anchors provided on the spring boxes make it possible to secure these with the concrete and its reinforcement A temporary polystyrene joint on the outskirts of the room will be destroyed before

lifting of the structure.

  The release of the pre-stressed spring Q allows the progressive lifting of the floor after drying. The spring boxes, which can be visited and dismantled with a view to changing the loads carried, allow the seat plate to be adjusted using

  of screw Q an upgrade of the structure.

  The spring and the interior of the spring boxes are protected against corrosion in order to guarantee a good resistance of the system over time. The spring box is sealed with a cover Q in the plane

of the ground.

Claims (3)

CLAIMS el Device for the implementation of floating floors characterized in that it consists of: elastic point supports at low natural vertical frequency, of the type with helical spring bolts integrated into the floor during casting. _ 5 2; Device according to Claim 17, characterized in that it can be visited after the floating floor has been put into service by opening an inspection hatch called cover () and that each support is removable and adjustable in height by action on the screw 3 _ Device according to claim 2 characterized in that the visitability, the dismantling and the adjustment allow the height adjustment and the frequency tuning in case of evolution of the loads and the excitations during the life of the room.   4) Device according to claim 1 i characterized in that the lifting of the floating floor after the drying of the concrete takes place by progressive release of the helical springs Q beforehand prestressed.   ) Device according to any one of the preceding claims   characterized in that anchors () on the spring boxes   allow to join these with the concrete and its frame.   6) Device according to any one of the preceding claims   characterized in that the helical springs and the interior of the   spring boxes are protected against corrosion.   7) Device according to any one of the preceding claims   characterized in that the helical spring boxes are sealed   by a cover (in the ground plane.