SU1530677A1 - Method of constructing vibration-insulated foundation under plant - Google Patents

Abstract

The invention relates to a method for erecting a vibration-insulated basement and reduces the laboriousness of erecting a foundation while reducing its material consumption. Base 1 is made and rubber 2 and spring 3 vibration isolators are mounted on it. In this case, rubber vibration isolators are mounted on plastic-viscous elements, and spring vibration isolators are pre-compressed. On the vibration isolator, the plates 5 of permanent formwork are installed and the upper block 6 is concreted to the height of the first concrete layer. After the required strength of the concrete of the first layer is obtained, the remaining part of the upper block is concreted and the equipment is mounted on it. The carrying capacity of the plastic-viscous element at the stage of construction of the upper block within the first seam of concrete is assumed to be equal to the calculated static load on one rubber vibration isolator, and the spring vibration isolator is pre-compressed with a force equal to the mass of the upper block within the first concrete layer, the arrival of one spring vibration isolator 5 il.

Description

(21) 4320395 / 23-33

(22) 10/27/87

(46) 12/23/89. Vul. Number 47

(71) State Design Institute Leningradsky Promstroyproekt

(72) S.K.Lapin, V.M.P. Tetsky and A.L.Matz

(53) 624.159.11: 621.8-217 (088.8)

(56) USSR Copyright Certificate No. 652276, cl. E 02 D 27/34, 1976.

Guidance on the design of vibroelectric equipment and equipment. M., stroiizdat, 1972, p. 130-131.

(54) METHOD FOR CONSTRUCTING A VIBRATED FOUNDATION UNDER EQUIPMENT

(57) The invention relates to a method for erecting a vibration-insulated basement and reduces the laboriousness of erecting a foundation while reducing its material intensity. Make the base 1

and set on it rubber 2

and spring 3 vibration isolators. In this case, rubber vibration isolators are mounted on plastic-like elements, and spring vibration isolators are pre-compressed. On the vibration isolator, the plates 5 of permanent formwork are installed and the upper block 6 is concreted to the height of the first concrete layer. After the required strength of the concrete of the first layer is obtained, the remaining part of the upper block is concreted and the equipment is mounted on it. The carrying capacity of the plastic-viscous element at the stage of the construction of the upper block within the first seam of concrete is assumed to be equal to the calculated static load on one rubber vibration isolator, and the spring vibration isolator is pre-compressed with a force equal to the mass of the upper block within the first concrete layer 1 coming in one spring vibration isolator 5 il.

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 J. The invention relates to the construction, in particular to the construction of foundations for machines with dynamic loads or high-precision equipment.

The purpose of the invention is to reduce the complexity of the construction of the basement yri while reducing its material intensity.

FIG. 1 shows a vibroisolated foundation, a vertical section i in FIG. 2 shows section A-A in FIG. one; in fig. 3 - spring vibration isolator; in fig. 4 - rubber vibration isolator with elastic-plastic element; in fig. 5 - elastic-plastic element, an embodiment.

The vibration-proof foundation is erected as follows.

Base 1 is made and rubber 2 and spring 3 vibration isolators are mounted on it. In this case, rubber vibration isolators are mounted on plastic-viscous elements 4, and spring vibration isolators are pre-compressed on a press. On the vibration isolator of the tori 2 and 3, the plates 5 of the permanent formwork are installed and the upper block 6 is concrete-cast on s o icoTy of the first concrete layer. After the required strength of the concrete of the first layer has been obtained, the concreting of the remaining part of the upper block is continued and equipment 7 is mounted on it.

During the assembly, the fabricated structure behaves as follows. When mounting fixed formwork plates 4 and laying the first layer of concrete, the vibration insulators are gradually loaded. In order to avoid the occurrence of additional uneven deformations in the concrete mass, due to the different stiffness of the spring and rubber vibration isolators, the load on the rubber vibration isolators is limited by the condition

R, 6 SPD — Q,

where P /, is the calculated static load on one rubber vibration isolator J

h is the height of the first concreting layer of the upper block.

fp is the cargo area per rubber vibration isolator, U is the bulk density of the material of the upper block;

Q

five

0

5 Q

Q with

0

five

Q - the weight of the fixed formwork within the cargo area Kr.

Each rubber vibration isolator 2 contains rubber elements 8, assembly plates 9 with adjusting bolts 10, by means of which the vibration isolator in question rests on plastic-viscous elements mounted on the base. Two versions of the adjusting bolts and plastic-viscous elements are possible. The first option provides for the presence of adjusting bolts of heads in the form of hemispheres 11 and the implementation of plastic-viscous elements in the form of cylinders 12. The second option provides for bolts with a threaded head 13 and high nuts 14 of plastic-viscous material. As a plastic-viscous material, for example,

copper or brass. I

Plastic-viscous elements 4 are selected in such a way that their deformation under a load not exceeding P is minimal compared to the elastic deformation of the Li of rubber elements 8.

Spring vibration isolators on this stage are not deformed, since they are preloaded from the condition

P LR "y + Qj, where P is the force to press the spring

vibration isolating torus, F - cargo area for one

spring vibration isolator, Q - weight of permanent formwork in

within the cargo area P „.

The compression of the spring vibration insulators is carried out by tightening the box-shaped lids 15, in which the springs 16 of the vibration insulator are mounted with end bolts 17.

After curing the concrete of the first layer, the rest of the upper block is concrete and the equipment is mounted.

At the same time, as the load on the vibration insulators increases, as the concreting and equipment installation takes place, the spring vibration isolators begin to compress in proportion to the applied load, and the plastic-viscous elements begin to move apart (flow), passing the bolt heads down.

one

Since the carrying capacity of plastic-viscous elements 4 in the first stage (i.e., in the process of the first concreting layer) satisfies the condition:

RP RP

where RP is the carrying capacity of plastic-viscous elements located under one vibration isolator at the stage of plastic deformation when the adjustment bolt is pressed into the plastic-viscous element of the head, then the load on the rubber vibration isolators does not exceed Р,

The heads of the adjusting bolts 10 begin to slide down to contact with the base 1, Hence the requirement that the free height about p of the adjusting bolts 10 should exceed the free stroke L of the heads of the adjusting bolts 1 in the plastic-viscous element, i.e. iS c L.

The working height of the plastic-viscous element, i.e., the vertical distance from the bottom of the head of the adjustment bolt to the base 1, is determined from the condition

d 9jyLi-9 to

Where

QMQ gves upper unit and equipment

weight of the upper unit within the first concreting layer i

rigidity of spring vibration isolators in the vertical direction.

The proposed method of erecting a vibration-insulated foundation under heavy equipment makes it possible to abandon the design of approaches to the installation sites of vibration isolators and, consequently, reduce the volume of building structures.

In addition, installation of vibration isolators is facilitated and installation technology is simplified. The proposed method of constructing vibroisolated foundations for heavy equipment has the most significant effect in the reconstruction of production. In many cases, it allows for a maximum | But to reduce the amount of structures being disassembled.

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The method of erecting a vibration-insulated basement for equipment, including the execution of the base, the installation of rubber and pre-compressed spring vibration isolators on it, the formation of the upper unit and the installation of equipment, characterized in that, in order to reduce the complexity of the construction of the foundation while reducing its material intensity, Based on that, plastic-viscous elements are installed and the heads of adjustment bolts of rubber vibration isolators are supported on them, on vibration isolator placing permanent formwork, and the upper unit is formed by layering a non-removable formwork for concreting, wherein the spring vibration isolation tori precompression force

R

P

where P is the pre-compression force of the spring vibration isolators;

the weight of the upper unit within the first concreting layer j is the number of spring vibration isolators,

and the carrying capacity of plastic-viscous elements within the first concreting layer and their height are determined respectively from the conditions

P P "

U,

where P is the carrying capacity of plastic-viscous elements located under the ONE-1H rubber vibration isolator at the stage of plastic deformation when pressed into the plate-viscous element of the head of the adjusting bolt; design static load on one rubber vibration isolator,

height of plastic-viscous element}

Q C - the weight of the upper unit and equipment,

weight of the upper unit within. the first layer of concreting; rigidity of spring vibration isolators in the vertical direction.

Q п Р, Л Q к, J

P o D o P

p

P

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П о / У7 n о П

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Claims (1)

SUMMARY OF THE INVENTION A method for erecting a vibration-insulated foundation for equipment, including making a foundation, installing rubber and pre-compressed spring vibration isolators on it, forming an upper unit and installing equipment, characterized in that, in order to reduce the complexity of erecting a foundation nf> H while reducing its material consumption, before the formation of the upper block on the basis of the mounting bolt, 15 then the load on the rubber vibration isolators does not exceed P <. The heads of the adjusting bolts 10 begin to slide down to contact the base 1. This implies the requirement that the free height S ' _{from the} adjusting bolts 10 must exceed the free play A of the heads of the adjusting bolts 1 in a plastic-viscous element, i.e. δ'ο> Δ. The working height of the plastic-viscous element, i.e. the vertical distance from the bottom of the head of the adjusting bolt to the base 1 is determined from the condition ^Q Kg where Q is the weight of the upper unit and equipment; Q - weight of the upper block within the first concrete layer To ₂ - the stiffness of the spring vibration isolators in the vertical direction. The proposed method of erecting a vibration-proof foundation for heavy equipment allows you to abandon the device approaches to the installation sites of vibration isolators and, therefore, reduce the volume of building structures, In addition, the installation of vibration isolators is facilitated and the technology of their installation is simplified. The proposed method of erecting vibration-insulated foundations for heavy equipment gives the most significant effect in the reconstruction of production. In many cases, it allows you to minimize the amount of disassembled structures. plastic-viscous elements are poured and the adjusting bolts of rubber vibration isolators are supported on them, fixed formwork is placed on vibration insulators, and the upper block is formed by layer-by-layer concreting on fixed formwork, while spring vibration isolators are precompressed by force P = 2 25 η where P is the pre-compression force of spring vibration isolators; Q is the weight of the upper block within the ed of the first concreting layer; η is the number of spring vibration isolators, and the bearing capacity of plastic-viscous elements within the first concrete layer and their height are determined respectively from the conditions Pn = P <, Δ => ^to · ζ where P is the bearing capacity of plastic 40 new elements located under one rubber vibration isolator, at the stage of plastic deformation when pressed into the plate-viscous element of the head of the adjustment bolt; P ^ - calculated static load on one rubber vibration isolator ¹ , Δ is the height of the plastic-viscous element; Q _w - the weight of the upper unit and equipment ¹ , Q is the weight of the upper block within. 'first layer of concreting; K _z - the stiffness of the spring vibration isolators in the vertical direction. ABOUT □ about □ □ about □ about □ about □ 4- FIG. δ Fig