Vibroisolating foundation

 

(57) Abstract:

The inventive vibroisolating Foundation includes a base unit, mounted on rollers. The unit communicates with a horizontal elastic elements. To block attached pendulum absorbers. Each damper is a flexible rod with extra weight on the top end. The lower end of the rod pivotally connected to the block. In the span portion of the rod is connected to the unit an additional elastic element calculated stiffness. In addition, the rod can be installed with the possibility of moving the trimmer weight, and the rod may be additionally connected to the block of the damping element. 1 C.p. f-crystals, 2 Il.

The invention relates to a means of protection against vibration low-frequency horizontal vibrations of foundations for machines.

Known vibroisolating the Foundation, including the base block, the horizontal elastic elements (insulators) and the rods, the hinge connecting the base unit to the base. The Foundation is made for the static pendulum and is characterized by reliable operation in the operational mode [1].

Known vibroisolating of Fund the s). To obtain a low natural frequencies of the horizontal oscillations of the vibration isolators are used with great flexibility, providing reliable operation in the operational mode [2].

A disadvantage of the known vibroisolating foundations is that in transient conditions when poslodavaca resonances at low frequencies Foundation oscillates with large amplitude to decrease which introduces special damping devices. In addition, due to the large flexibility of the vibration dampers under large amplitude oscillations of the Foundation in transient mode to prevent buckling, vibration isolators in their work on compression it is necessary to provide a special event, for example, the additional device supports.

The aim of the invention is to increase the vibration protection Foundation with low-frequency horizontal oscillations in transient conditions.

The objective is achieved by the fact that vibroisolating Foundation, including mounted on rollers in the base block and the horizontal elastic elements, equipped with an additional elastic elements and pendulum vibration damper, each of which is formed of a flexible rod and dopolnitelnom an additional element, the rigidity is determined from the relation:

Cd= , where Cdthe additional stiffness of the elastic element;

md- additional weight;

fthe oscillation frequency block (basement);

l is the length of the rod;

E - the modulus of elasticity of the first material web;

J is the moment of inertia of the cross section of the rod;

a - the distance from the point of attachment of the additional elastic element to the terminal to the hinge fastening.

Additionally, at each terminal, with the possibility of longitudinal movement of fixed trimmer mass, and between the rod and the block is additionally equipped with a damping element.

In Fig.1 shows the proposed vibroisolating Foundation; Fig.2 - the same, top view.

Vibroisolating Foundation contains mounted on rollers 1 base unit 2, the horizontal elastic elements 3, a flexible shaft 4 with the additional weight of 5 on the upper end attached to the block bottom end by means of the hinge 6. Between the core and the Foundation hosted an additional elastic element 7.

The rod 4 is located trimmer weight 8 can move along its axis, and between the rod 4 and the block telynau mass on its upper end forms a so-called static pendulum, movement which fluctuations are accompanied by collisions between the additional mass and power.

Utilizing a static pendulum rod which is connected to the unit by the elastic element, allows to obtain a low circular frequency of oscillations of the pendulum with the length of the rod, commensurate with the height of the Foundation.

For effective damping in transient conditions it is necessary that the frequency of oscillation of the pendulummwas equal to half the frequency of oscillations Foundationf. Hence conditions (conditions for resonance frequency tuning), the rigidity WITHdan additional element 7 should be determined by the ratio:

Cd= ,

where md- additional weight;

mfthe oscillation frequency block;

l is the length of the rod;

E - the modulus of elasticity of the first material web;

J is the moment of inertia of the cross section of the rod;

a - the distance from the point of attachment of the additional elastic element to the terminal to the hinge fastening.

The Foundation works in the following way.

Under the applied dynamic loads in transient mode (when poslodavaca resonances) block 2 mounted n the cops 3. Fluctuations of the Foundation of the cause of motion attached to it by means of the hinge 6 and the additional elastic element 7 static pendulum, which are accompanied by collisions located on the upper end of the rod 4 additional mass 5 unit 2. These collisions cause the dissipation of the oscillation energy and provide a significant reduction of the maximum deviations of the Foundation from the position of static equilibrium. The additional stiffness of the elastic element 7, made in accordance with the above ratio, provides the required configuration of the pendulum resonant frequency; however, for each conditional oscillation period is one collision between the block and the additional mass. Trimmer weight 8 provides smooth control and a high degree of tuning accuracy due to the possibility of its displacement along the axis of the rod 4. The damping element 9 reduces the sensitivity of the pendulum when small deviations from the conditions settings. Trimmer weight 8 and the damping element 9 ensure the stability of the parameters of the pendulum.

The size of the gap D between the extra weight of 5 and the block 2 is made zero. In this case, when performing in the oscillations of the Foundation.

1. VIBROISOLATING FOUNDATION, including mounted on rollers in the base block and the horizontal elastic elements, characterized in that, to increase the vibration protection Foundation with low-frequency horizontal oscillations in transient conditions, it is equipped with an additional elastic elements and the pendulum damper, each of which is formed of a flexible rod and the additional mass on its upper end, and a rod connected to the unit with the bottom hinge and migration through an additional element, the stiffness Cdis determined from the relation

Cd= ,

GGE Md- additional weight;

wfthe oscillation frequency block;

l is the length of the rod;

E - the modulus of elasticity of the first material web;

J is the moment of inertia of the cross section of the rod;

a - the distance from the point of attachment of the additional elastic element to the terminal to the hinge fastening.

2. The Foundation under item 1, characterized in that each rod with the possibility of longitudinal movement of fixed trimmer mass, and between the rod and the block is additionally equipped with a damping element.

 

Same patents:

The invention relates to the construction and relates vibroisolating of foundations for dynamic loads

The invention relates to the construction, and in particular to methods of construction of foundations for equipment

FIELD: construction, particularly new building erection and existent building reconstruction under any engineering-geological circumstances.

SUBSTANCE: foundation structure comprises shallow foundation and reinforcement members. Reinforcement members are made as vertical bars of precast or cast-in-place piles having diameters less than 200 mm and arranged along foundation perimeter. The piles are spaced a distance from outer foundation faces. The distance is equal to 0.1-0.5 of reinforcement member diameter. Distance between neighboring piles is equal to 2-4 reinforcement member diameters and reinforcement member length is 15-20 diameters thereof.

EFFECT: increased load-bearing capacity due to creating compressive operational conditions under different engineering-geological circumstances, increased dynamic rigidity of foundation base and reduced foundation deformation and vibrational amplitude.

9 dwg

FIELD: mechanical engineering, particularly large electrical machines and foundations for turbogenerator and hydraulic generators.

SUBSTANCE: foundation slab comprises stator body base including support part connected with foundation. Arranged between support part and foundation is damping panel including reinforcement formed as vertical rods. Foam plastic member is put on the vertical rods and grouted with concrete grout. Vertical rods are connected one to another in horizontal plane with wire arranged at least in two levels in vertical plane of damping panel. Vertical rods extend through support part, pass into stator body base and into foundation.

EFFECT: reduced dynamic pressure applied to foundation slab and increased structural rigidity.

1 dwg

FIELD: vibration protection means for building industry, particularly vibroinulated foundations for machines, engines, or ordnance.

SUBSTANCE: vibroinsulated foundation comprises bath and foundation block arranged in the bath so that the foundation block is spaced from bath walls and bottom. The foundation block is higedly connected with bumpers, which in turn are attached to foundation block by means of hinged lever. The lever connects foundation block with support member of bumper. The bumper has pendulum suspension means and comprises compression spring cooperating with the base and with the pendulum suspension means. The pendulum suspension means is made as threaded rod connected to spherical washer formed on one end thereof and with threaded bush also attached to spherical washer end not connected with threaded rod. The spherical washers cooperate with not less than 3 balls located on conical surfaces of support members and cooperating with upper spring end and object to be protected against vibration correspondingly. Buffer limiting elastomeric members are installed in base.

EFFECT: increased efficiency of vibration protection and simplified foundation structure.

2 dwg

FIELD: vibration protection means for building industry, particularly vibroinulated foundations for machines, engines, or ordnance.

SUBSTANCE: vibroinsulated foundation comprises bath and foundation block arranged in the bath so that the foundation block is spaced from bath walls and bottom. The foundation block is higedly connected with bumpers, which in turn are attached to foundation block by means of hinged lever. The lever connects foundation block with support member of bumper. Bumper has resilient member formed as two serially connected elastic resiliently-damping members divided with washer. Pendulum suspension means of the bumper is made as threaded pin having the first end connected to hinged lever and the second end connected to nut and thrust washer, which are connected to bush. The bush is attached to resilient member. The thrust washer is made of resilient material. Resiliently-damping member is formed as pleached strands or tangled wires.

EFFECT: increased efficiency of three-dimensional vibration protection and simplified foundation structure.

2 dwg

FIELD: vibration protection means for building industry, particularly vibroinulated foundations for machines, engines, or ordnance.

SUBSTANCE: vibroinsulated foundation comprises bath and foundation block arranged in the bath so that the foundation block is spaced from bath walls and bottom. The foundation block is higedly connected with bumpers, which in turn are attached to foundation block by means of hinged lever. The lever connects foundation block with support member of bumper. The bumper has pendulum suspension means made as threaded rod with spherical profile on one rod end and threaded bush also having spherical profile. Both spherical profiles cooperate with conical surfaces of upper and lower plates correspondingly. Resilient member is made as serially connected resilient discs connected with outer bush surface along inner disc diameters. One bush end is fixedly secured to the base, another bush end is slidably installed in guiding bush.

EFFECT: increased efficiency of three-dimensional vibration protection and simplified foundation structure.

2 dwg

FIELD: vibration protection means for building industry, particularly vibroinulated foundations for machines, engines, or ordnance.

SUBSTANCE: vibroinsulated foundation comprises bath and foundation block arranged in the bath so that the foundation block is spaced from bath walls and bottom. The foundation block is higedly connected with bumpers, which in turn are attached to foundation block by means of hinged lever. The lever connects foundation block with support member of bumper. The bumper has pendulum suspension means made as threaded rod with spherical profile on one rod end and threaded bush also having spherical profile. Both spherical profiles cooperate with conical surfaces of upper and lower plates correspondingly. Resilient member is made as serially connected resilient disc means formed as disc springs connected with each other along outer diameters by means of ring having T-shaped profile and along inner diameters by means of ring having inner surface cooperating with outer bush surface. One bush end is fixedly secured to the base, another bush end is slidably installed in guiding bush.

EFFECT: increased efficiency of three-dimensional vibration protection and simplified foundation structure.

2 dwg

FIELD: vibration protection, particularly to erect vibroinsulated foundations for machines and equipment subjected to dynamic loads.

SUBSTANCE: vibroinsulated foundation comprises bath, foundation block arranged in the bath so that the foundation block is spaced from bath walls and bottom and is pivotally connected to vibroinsulators. Each vibroinsulator is attached to foundation block by means of pivoted lever, which connects foundation block with support member of vibroinsulator. Each vibroinsulator has pendulum hanger made as threaded rod with spherical profile on one end thereof and comprises threaded bush fastened to the rod and having spherical profile. Both spherical profiles cooperate with conical surfaces of support vibroinsulator member and upper conical bush correspondingly. The resilient member of vibroinsulator is made as a number of serially connected resilient elements secured to bush along outer diameters thereof. The bush is fixedly connected to vibroinsulator base. Inner resilient element diameters are attached to bush, which encloses rod. One bush end abuts the last resilient element, another end cooperates with upper conical bush. Each annular resilient element may be formed as at least two flat resilient coaxial rings, namely inner and outer ones, which are fastened with each other by at least three resilient flat plates or resilient rods having round or polygonal sections. Each annular resilient element may be formed of at least two flat coaxial resilient rings, namely of upper and lower ones, connected with each other by at least three resilient flat plates, which are inclined to ring axes, or resilient rods having round or polygonal sections.

EFFECT: increased efficiency of volumetric vibroinsulation and simplified structure.

3 cl, 5 dwg

FIELD: construction.

SUBSTANCE: invention is related to means of protection against hazardous effect of vibration and may be used in construction, in particular in arrangement of vibration-insulated foundations for machines and equipment with dynamic loads. Foundation on vibroprotective elements comprises bath, foundation unit arranged in it with clearance versus walls and bottom and hingedly joined to vibration isolators installed in bath bottom. Vibration isolators are joined to foundation unit by means of hinged lever, which connects foundation unit to support element of vibration isolator, which comprises elastic element, body and pendulum suspension. Body is arranged in the form of box with lower base and upper plate with hole for threaded pin of pendulum suspension, which are connected to each other by three side ribs, with creation of window for accommodation of support lever, on which vibration-insulated object is arranged. Elastic element is arranged in the form of three serially connected elements: elastic ones and elastic-damping element arranged in between. Elastic elements with one of their bases are installed in bushes, which are fixed accordingly on upper plate of body and cover, and rest against washers with their other bases, and washers are joined with elastic-damping element. Pendulum suspension is arranged in the form of threaded pin, which is connected by one end to support lever for fixation of vibration-insulated object, and by other end - to nut and thrust washer, which is joined to cover attached to elastic element. Elastic-damping element is arranged in the form of steel-wire weaving or metal thread waste.

EFFECT: increased efficiency of spatial vibration insulation and simplified design.

2 dwg

FIELD: construction.

SUBSTANCE: inventions relate to the field of foundation engineering of deep burial for important objects, such as nuclear power plants. Method for erection of nuclear power plant foundation consists in engineering-geological survey with detection of soil foundation layers depth, which complies with depth of active compressing thickness H, its physical-mechanical properties: angle φ of inner friction, c - specific adhesion, γ - density, E0 - module of common deformation, µ0 - coefficient of Poisson, which correspond to design elastic compressing load under deep buried foundation, in erection of mine pit with shape that corresponds to foundation, filling of filled layer of soil onto mine pit bottom and its compaction, erection of curb with reinforcement frame inside and its filling with high grade concrete. Foundation, which is solid in plan, is given convex spherical shape, which is inscribed in plan into configuration of monolithic foundation by radius of circumference, radius of sphere is identified by given dependencies, as well as maximum angle of elastic semi-contact of foundation sphere with soil foundation, pressure of structural tensile strength of foundation, central critical pressure under center of sphere in maximum elastic base. Bottom of mine pit for concave foundation is arranged with response spherical groove.

EFFECT: improved bearing capacity of foundation, improved elastic contact interaction of foundation with underlying soil foundation.

2 cl, 7 dwg

FIELD: construction.

SUBSTANCE: method for erection of foundation under machines consists in deepening of massive reinforced concrete foundation foot of rectangular or prismatic shape in plan into ground base by ≥¼ of its height, but at least 1 m, its hydraulic insulation against hazardous effect of aggressive ground waters and arrangement of centre of gravity of machine and center of gravity of foundation foot area on the same vertical line, at the same time support surface of foundation is accepted as having area calculated according to given dependence. Support surface of foundation, which is rectangular in plan, is arranged with foot of spherical convex shape, at the same time given dependences are used to identify radius, angle of sector of elastic half-contact of sphere with ground, pressure of structural strength of ground for stretching, critical pressure under center of sphere, besides sphere of foundation is deepened. Support spherical surface is prevented against displacements with slippage and against tilting under action of external dynamic load by increasing edge horizontal support part of foundation rectangular in plan, protruding beyond edges of spherical support central surface, or by anchoring foundation to soil by means of piles. Also arrangement of foundation for machines is proposed.

EFFECT: increased bearing capacity, increased service life.

4 cl, 2 ex, 15 dwg

Up!