Method Of Protecting A Building Or Group Of Buildings From Seismic Waves Using Gelifying Polymers

a technology of gelifying polymer and building, applied in the direction of building repair, foundation engineering, shock proofing, etc., to achieve the effect of increasing the maximum horizontal deformation capability and increasing the gap width

Inactive Publication Date: 2015-11-26
S P C M SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013]It has been found that the use of a gelled polymer is beneficial for absorbing the horizontal components of the seismic waves that may impinge on the vertical walls of the foundations. This gel may called a gel-based dissipative and re-centering polymer.
[0014]The gel will damp the energy brought by the waves while re-centering the building during the earthquake and once the earthquake it phased out.
[0022]In the specific case of upgrading existing seismic isolation systems on a building already surrounded by an empty trench enabling its displacement when the earthquake occurs, the gel poured into it will enable to meet more stringent seismic classification by avoiding to increase the gap width and / or replacing the isolators. A subsequent advantage is that it protect the gap itself from the insertion in it of earth or other rigid materials that may hinder, in the future, the free motion of the seismically isolated superstructure.
[0035]Substitution of a proportion of the acrylamide with neutralized acrylic acid makes it possible to increase the swellability of the SAP polymers, for example to reduce the amount of polymer required.
[0055]The gel can, if necessary, be easily removed by suction by means of a truck or brought back up to level with a fresh injection of gel. As a result, the easiness and limited cost of gel replacement will reduce maintenance cost of the system while ensuring a life expectancy compatible with code requirements.

Problems solved by technology

The problem to be solved is therefore to develop a method for protecting a building or a group of buildings from the horizontal components of the seismic waves, which, as mentioned, are usually the most dangerous for a structure (usually, only in epicentral areas the effects of the vertical component may be very important).

Method used

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  • Method Of Protecting A Building Or Group Of Buildings From Seismic Waves Using Gelifying Polymers
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  • Method Of Protecting A Building Or Group Of Buildings From Seismic Waves Using Gelifying Polymers

Examples

Experimental program
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Effect test

example 1

Placement of a Superabsorbent Polymer

[0068]A superabsorbent polymer, in this instance an acrylamide / sodium acrylate / ATBS Na terpolymer (70 / -25 / 5), with grain size less than 5 mm, is swollen with water in a dissolving tank to about 150 to 200 times its volume. It is then transported by truck to the site, where it will be pumped to fill trenches 4 m deep and 40 cm wide around a sensitive building (FIG. 1 or 2).

example 2

Preparation and Use of a Gel Obtained from a Mixture of 2 Solutions

[0069]Two solutions are prepared:

[0070]The first A contains:[0071]Water 200 kg[0072]50% Acrylamide 9600 kg[0073]Methylene-bis-acrylamide (MBA) 300 kg[0074]Triethanolamine 300 kg

[0075]The second B contains:[0076]Water 9900 kg[0077]Sodium persulphate 297 kg

[0078]These two solutions are pumped and mixed and then the mixture is injected into the trench, in which polymerization takes place, forming a vibration-absorbing rigid gel (FIG. 1 or 2).

example 3

[0079]An acrylamide / sodium acrylate mixture (70-30 mol %) in solution at 50% and containing 3% of triethanolamine and 3% of MBA is transported in a tanker truck. At the site, a solution of 300 kg of sodium persulphate dissolved in 990 kg of water is added to this mixture. This permits in situ polymerization with a gel of good consistency.

[0080]A biocide, Protectol HT (triazine), is added in a small amount (0.01 wt %) for product stability.

[0081]A trench made 10 meters from the building and having the dimensions 5 meters deep and 50 cm wide is filled with the prepared gel.

[0082]The building is separated from the subjacent ground by a flexible footing, usually of rubber, and at the side walls by a trench containing gel. It has exceptional seismic performance.

[0083]The use or production of superabsorbent gels can be modified by a person skilled in the art for adapting to the local conditions.

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Abstract

A method for protecting a building or a group of buildings from the horizontal components of the seismic waves, including: forming a trench around all or part of the periphery of the building or group of buildings, or an excavation under the building, and filling the trench or the excavation with at least one pregelled polymer, or of at least one polymer and / or of a mixture of polymerizable monomers that can undergo gelation in the trench.

Description

FIELD OF THE INVENTION[0001]Buildings constructed in seismic zones are subject to increasingly strict regulations.[0002]These regulations relate to the actual structure of the buildings, but also to the mechanical systems for compensating movements and for construction on a seismic isolation system enabling the movement of the building superstructure (namely the building part that is supported by the isolators) to be quasi disconnected from that of the ground.BACKGROUND OF THE INVENTION[0003]Most seismic isolation systems act only in the horizontal plane, because the horizontal earthquake components are usually the most dangerous for a structure and also to avoid rocking of the superstructure, which is difficult and costly to be controlled. If a building is protected by a horizontal seismic isolation system, its superstructure shall be and remain fully free to move laterally to the design displacement of the isolators, which varies from some tens of centimeters in Europe to one mete...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): E02D31/08E02D27/34E04B1/98E04H9/02
CPCE02D31/08E04B1/985E02D27/34E04H9/021E04H9/0215
Inventor BEZAC, STEPHANEHUTSEBAUT, SAMUEL
Owner S P C M SA
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