Elastic building support

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1. Introduction

Example of elastic building supportProject: Maltershöfe, Malters, Switzerland

The structure is mounted on PURASYS vibrafoam elastic elastomer mats in the area of foundation.

Various PURASYS vibrafoam types were arranged over the surface below the foundation plate.

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Maltershöfe, Malters, Switzerland

Protection against vibrationsthrough elastic building support

Advantages of vibration isolation of buildings with PURASYS vibrafoam and PURASYS vibradyn

reliable protection against external sources of interference

improved living and working quality

Increase in the market value of properties

Inner-city development is increasingly taking place in a field of tension consisting of residential develop-ment, usable space and traffic. Short distances to shopping facilities and good accessibility by car and public transport contribute to an improved quality of life. At the same time, however, noise and vibrations from motor vehicles and rail vehicles can have con-siderable adverse effects. Adjoining industrial plants are considered to be another source of disturbing vi-brations.

Without protective measures on buildings, vibrations can damage them for a longer period of time. The comfort of use is also reduced, as on the one hand very strong vibrations occur in the building and on the other hand vibrating walls and ceilings stimulate the air to vibrate. This creates secondary airborne noise.

PURASYS products made of polyurethane open up many ways to minimize these restrictions. KRAIBURG PuraSys offers solutions for effective vibration and shock protection.

Expertly designed elastic bearings not only increase the market value of buildings but also offer the possi-bility of combining living, traffic and industrial use in a confined space.

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Sources of noise and vibration emissions

2. Planning stage

Early consideration of important aspects in planning

Buildings which are constructed near railway tracks are most frequently affected by unwanted vibrations. In order to counteract these disturbances, two types of measures can be taken. On the one hand, the in-terference source (platform) can be decoupled from vibrations. This is called source isolation. On the other hand, the receiver (building) can be supported elastically, so it is a receiver isolation. With PURASYS products you have all possibilities both for source iso-lation (e.g. by mass-spring systems, sub-ballast mats in railway operation and by decoupled machine foun-dations in industrial plants) and for decoupling the vibrations directly at the point of impact. Noise and vibrations in buildings not only reduce the quality of living and working, they can even be im-permissible. For the latter, the relevant standards

regulate the permitted levels for different uses and at different times of the day. Architects and planners should consider at an early stage whether elastic be-aring support is necessary for new buildings, as later installation is only possible with considerable effort.

airborne sound

Primary airborne sound

Secondary airborne sound

structure-borne sound

Sub-ballast mats for structure- borne sound isolation

Sub-ballast mats for gravel protection

Elastic layer formass-spring system

Elastic layer for slab track

Isolation withPURASYS vibrafoam/PURASYS vibradyn

Train

TrainTramway

Subway

vibrations

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Am Bahnhof Schlieren, Zurich, Switzerland

As a rule, dynamic building studies are carried out for this purpose. The measurements of the vibration immissions on the construction site and subsequent building modelling are therefore carried out. KRAI-BURG PuraSys is at your disposal as a partner and supports you in all aspects of elastic bearing, espe-cially in the selection of suitable PURASYS products.

The effort required for optimal storage of the building depends on the complexity of the construction project and the type of vibration. We develop efficient solu-tions in close cooperation with structural engineers and building dynamics engineers. KRAIBURG Pura-Sys application technology designs the products and creates the installation plans based on the load plans and the required efficiency, so that nothing can stand

in the way of trouble-free installation.

Groundwater also plays a role in product selection, for example in buildings with basements. Only polyu-rethane foams with a closed-cell structure, such as PURASYS vibradyn, absorb almost no water and can fully develop their potential even under these condi-tions.

The product series PURASYS vibrafoam and PURA-SYS vibradyn can be used for elastic building support in different designs, namely as full-surface, strip-like or punctual building support.

Requirements for successful elastic building support

Detection of vibration excitation by vibration measurement on the construction site

Forecast calculation (general transfer functions, numerical method)

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3. Measures

Am Bahnhof Schlieren, Zürich, Switzerland

Full-surfacebuilding support

In the case of full-surface building support, PURASYS products are laid on an impedance plate (cleanliness layer or support plate). As a result, the entire base plate is elastically decoupled from the subsoil.

This design is relatively simple and does not require any changes in the building construction. In addition, the elastomer mats can usually be laid quickly.

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Mercedes-Benz-Platz, Berlin, Germany

Mercedes-Benz-Platz, Berlin, Germany

Strip-likebuilding support

The strip-like building support can be used for buil-dings with linear foundations. Through a targeted de-sign measure, the width of the strip foundations can be selected in such a way that the PURASYS products are optimally utilised and thus have the most efficient isolating effect.

This design also enables individual floors to be de-coupled. Often, the cellar ceiling is also stored on ela-stic strips

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Measures Continuation

Punctualbuilding support

The punctual building support is perfectly suited for buildings with punctiform foundations. In addition, it is possible to isolate individual floors resting on sup-ports from one another instead of an entire building.

When a building is constructed on pile foundations, very large forces usually act on small areas. Often it is not possible to reduce the load by constructive chan-ges. In such cases the products of PURASYS vibradyn HL series are used.

Full-surface building support combined with defined point bearings, Switzerland

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Seestraße, Zurich, Switzerland

Sidewalldecoupling

In addition to horizontal bearing, vertical decoupling is recommended - sidewall decoupling. This means that the side walls of buildings with basements can also be completely or partially isolated.

This version can also be made later for existing buil-dings.

Seestraße, Zurich, Switzerland

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4. Solutions with PURASYS products

PURASYS vibrafoam/vibradynThe materials fromKRAIBURG PuraSys

With the technically high-quality PURASYS vibrafoam and PURASYS vibradyn products made of mixed-cell or closed-cell polyurethane, demanding projects in the field of vibration isolation and sound insulation can be implemented.

The finely graduated range of standard types makes it possible to achieve low tuning frequencies over the entire design range.

Thanks to the closed-cell foam structure of PURA-SYS vibradyn, storage can even take place below the groundwater level without any problems.

PURASYS vibrafoam and PURASYS vibradyn are cha-racterised by their permanently constant isolating effect and have excellent chemical properties which allow operating temperatures of - 30 °C to + 70 °C and also give the material a high resistance to water, concrete, oils and diluted acids or alkalis. Even short-term temperature and load peaks that act beyond the intended load do not cause permanent damage to the products.

The application technology department is at your dis-posal as a competent contact for all questions regar-ding design.

Biozentrum Basel University, Switzerland

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Different kind of types of PURASYS vibrafoam

Example of an installation plan

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PURASYS vibrafoam SD 170

PURASYS vibrafoam SD 400

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KRAIBURG PuraSys GmbH & Co. KG Porschestraße 1

49356 Diepholz / GERMANY www.purasys.com

Installation plan - BaseplateProject: Building A02Date: March 22, 2018

© KRAIBURG PuraSys GmbH & Co. KG Page 1 of 1

This is a one-dimensional calculation for a solid and plane ground based on the model of a harmonic oscillator. A rigid mass in the center of gravity and a mass-less spring are assumed. The non-linear properties of the material and the form factor are considered. The data is based on our current data sheets. The results are intended only as a summary and general overview for an ideal system. KRAIBURG PuraSys shall not be liable for incidental and/or consequential damages directly or indirectly sustained, nor any loss caused by not complying with relevant industry/product standards and improper use of any PURASYS vibrafoam and vibradyn products. For suitability to the prevailing site conditions, it is advised that certified testing should be conducted. It is recommended to seek further advice on your application with our technical staff prior to use. All information is without guarantee.

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PURASYS vibrafoam SD 170

PURASYS vibrafoam SD 400

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16[m]

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KRAIBURG PuraSys GmbH & Co. KG Porschestraße 1

49356 Diepholz / GERMANY www.purasys.com

Installation plan - BaseplateProject: Building A02Date: March 22, 2018

© KRAIBURG PuraSys GmbH & Co. KG Page 1 of 1

This is a one-dimensional calculation for a solid and plane ground based on the model of a harmonic oscillator. A rigid mass in the center of gravity and a mass-less spring are assumed. The non-linear properties of the material and the form factor are considered. The data is based on our current data sheets. The results are intended only as a summary and general overview for an ideal system. KRAIBURG PuraSys shall not be liable for incidental and/or consequential damages directly or indirectly sustained, nor any loss caused by not complying with relevant industry/product standards and improper use of any PURASYS vibrafoam and vibradyn products. For suitability to the prevailing site conditions, it is advised that certified testing should be conducted. It is recommended to seek further advice on your application with our technical staff prior to use. All information is without guarantee.

Our services at a glance

Material testing and measurement on our own large test bench

Project support right from the start

Preparation of installation plans

KRAIBURG PuraSys GmbH & Co. KG

Porschestraße 1 · D-49356 DiepholzFon +49 (0) 5441. 5954-0 · Fax +49 (0) 5441. 5954-24info@kraiburg-purasys.com · www.purasys.com

© KRAIBURG PuraSys GmbH & Co. KG All information without guarantee. Subject to change without notice.