SE436774B

SE436774B - Procedure and device for protecting a building with foundations on piles or similar construction against ground vibrations

Info

Publication number: SE436774B
Application number: SE8203047A
Authority: SE
Inventors: B B Broms; R Massarsch
Original assignee: Massarsch Karl Rainer
Priority date: 1982-05-14
Filing date: 1982-05-14
Publication date: 1985-01-21
Also published as: SE8203047L

Abstract

This invention concerns a procedure for the protection of buildings with a foundation on piles or similar constructions against ground vibrations and a device for implementing the procedure. The invention is characterised by the fact that the pile (2) applied at the pile footing (2') in the building (1) is lowered into a pipe or similar surrounding device (3) with a larger diameter, so that the pile (2) is freestanding in the pipe in relation to the surrounding earth. A gap or play (8) is created between the pile footings (2') and the rest of the building (1) and the underlying soil. In addition, a possible release plate (5) or beam loaded with a filling of earth (7') is placed and combined with a vibration dampening device (6) that is applied between the building (1) and release plate (5) or beam and/or between the pile (2) and the pipe (3). The gap (8) can possibly be provided with a special spacer (7) or temporary support during casting of the foundation.<IMAGE>

Description

82030lﬂ-9 förhindrar, att pålarna 2 komma i kontakt med den omgivande jorden ned till ett visst djup under markytan. Byggnaden 1 är grundlagd på pålplattor 2', vilka vardera äro anordnade med t.eï. två pâlar 2. Den i ett rör 5 nedförda pålen 2 har mindre diameter än röret, varför ett visst mellanrum 3' upp- kommer. Det är viktigt, att en spalt eller ett glapp 8 också finns mellan pålplattorna 2' med resterande byggnad 1 och un- derliggande jord. Spalten kan åstadkommas på olika sätt t.ex. med hjälp av speciellt utformade mellanlägg 7, temporära stöd vid gjutning av grundplattor etc. Genom att pålarna 2 äro om- givna av rör 3 och stå fritt, reduceras deras styvhet, Röret kring pålen har två funktioner dels att reducera pålarnas 2 elasticitetsmodul, varvid den naturliga egenfrekvensen mins- kar dels att reducera amplituden för de vibrationer, som över- föras till byggnaden 1 genom pålen 2. Härvid minskas byggna- dens 1 egenfrekvens, eftersom pålarna 2 verka som fjädrar i jorden. }enom att variera pâlens 3 längd i röret samt dess diameter kan man reglera elasticitetsmodulen och på så sätt anpassa frekvensen, så att minsta möjliga dynamisk påverkan uppnås. dvstämningen av byggnadens 1 egenfrekvens med avseen- de på markvibrationernas karaktär kan även åstadkommas på fle- ra andra sätt, såsom visas i figurerna 3 och 4. Exempelvis kan en släpplatta eller balk 5 installeras 1 den omgivande jorden och kombineras med vibrationsdämparorgan 6, som anbringas mel- lan byggnad 1 och släpplatta 5 eller balk och/eller mellan på- len 2 och röret 3. Byggnadens 1 sidomotstând kan ökas genom an- bringande av t.ex. en släpplatta 5, som belastas med jordfyllning 7' eller att en vertikal balk nedföres i jorden. 82030l ﬂ-9 prevents the piles 2 from coming into contact with the surrounding soil down to a certain depth below the ground. The building 1 is based on pile plates 2 ', each of which is arranged with t.eï. two piles 2. The pile 2 lowered into a pipe 5 has a smaller diameter than the pipe, so that a certain gap 3 'arises. It is important that a gap or a gap 8 is also present between the pile plates 2 'with the remaining building 1 and the underlying soil. The gap can be achieved in different ways e.g. by means of specially designed spacers 7, temporary supports when casting base plates, etc. By the piles 2 being surrounded by pipes 3 and standing free, their rigidity is reduced. The pipe around the pile has two functions and to reduce the modulus of elasticity of the piles 2, whereby the the natural natural frequency decreases partly to reduce the amplitude of the vibrations, which are transmitted to the building 1 through the pile 2. This reduces the natural frequency of the building 1, since the piles 2 act as springs in the earth. By varying the length of the pile 3 in the tube and its diameter, it is possible to regulate the modulus of elasticity and thus adjust the frequency, so that the least possible dynamic effect is achieved. The natural frequency of the building 1 with respect to the nature of the ground vibrations can also be achieved in several other ways, as shown in Figures 3 and 4. For example, a release plate or beam 5 can be installed in the surrounding earth and combined with vibration damping means 6, which are applied between building 1 and release plate 5 or beam and / or between the pile 2 and the pipe 3. The side resistance of the building 1 can be increased by applying e.g. a release plate 5, which is loaded with soil filling 7 'or that a vertical beam is lowered into the soil.

Uppfinningen är naturligtvis icke begränsad till detta utföran- de utan kan självklart varieras inom ramen för uppfinnings- tanken.The invention is of course not limited to this embodiment but can of course be varied within the scope of the inventive idea.

Claims

1. pg ﬁ g 3 atzozouv-s I QUALITY. ~ R \ - "

1 .. ldlxàxrlfniilzl 1 Earthwork for the protection of buildings laid on needles or similar structures against ground vibrations, I ä nneteck - nat _ rev, that the oàlen (2) nndfüres placed on a pile plate (2 ') in the village (1) in a larger diameter pipe or similar extraction device (3), so that the pawl (2) is made to stand in the pipe in relation to the surrounding soil, a gap or a gap (u) being made between the pile plates ( 2l) down the remaining eyelet (|) and underlying soil, and optionally a release plate (5) or beam, which is loaded with the soil fill (7 '), is arranged and combined with a vibration damper motor (b), which is placed between eyeglasses (1) and release plate (b) or beam and / or between the pile (2) and the pipe (3) 2. A method according to claim 1, characterized in that the epalten (8) may have a special intermediate (7) or temporary Support for casting the base plate 5 Device for carrying out the method according to claims 1 and 2 for s protection of buildings based on piles or similar constellations or drug vibrations, characterized in that the pile (2), which is arranged on a pile plate (2 ') in the building (1), is arranged to be ncdsüttas in a larger diameter pipe or similar surrounding device (3), so that the pile (2) is arranged to stand free in the pipe (5) in relation to the surrounding soil, a gap or a gap (8) being arranged between the pile plate (2) ') with the remaining building (1) and the underlying soil, and possibly an electric plate (5) or beam, which is loaded with soil filling (7'), is iniörü and combined with a vibration damper means (6), which is fitted zero the building (1) and the electrical plate (5) or the beam and / or between the beam (2) and the pipe (3) in order to reduce the beam frequency 4 device of the building according to claim 3, characterized in that the spnltenÃ8) is optionally provided with a special spacers (7) or temporary supports when casting base plate.