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EN 12716:2001

(Main)

Execution of special geotechnical works - Jet grouting

Execution of special geotechnical works - Jet grouting

1.1 ST This Standard is applicable to the execution, testing and monitoring of jet-grouting works. Some considerations about design are also given. 1.2 ST The execution of jet-grouting works requires knowledge and experience in this type of contruction. NOTE 1: The jet-grouting process must be distinguished from the grouting processes covered by the standard EN 00288006.

Ausführung von besonderen geotechnischen Arbeiten (Spezialtiefbau) - Düsenstrahlverfahren (Hochdruckinjektion, Hochdruckbodenvermörtelung, Jetting)

Anwendungsbereich
Diese Norm gilt für Ausführung, Prüfung und Überwachung von Düsenstrahlarbeiten. Aspekte der Planung, die sich speziell auf das Düsenstrahlverfahren beziehen, sind in Abschnitt 7 enthalten. Weitere allgemeine Erfordernisse für den Entwurf befinden sich im Anhang A und können in die Norm einbezogen werden oder in Abschnitte einer späteren Fassung des Eurocode 7 aufgenommen werden.
ANMERKUNG   Das Düsenstrahlverfahren unterscheidet sich wesentlich von den in EN 12715 erfassten Injektionsverfahren.

Exécution des travaux géotechniques spéciaux - Colonnes, panneaux et structures de sol-ciment réalisés par jet

Domaine d'application
La présente norme s'applique à la réalisation par jet de colonnes, de panneaux et de structures enterrés constitués d'un mélange de sol et de ciment ainsi qu'aux essais et au contrôle de ces travaux. Des prescriptions plus générales qui pourraient être incluses dans ce document ou faire l'objet d'articles dans les futures éditions de l'Eurocode 7 sont listées en annexe A.
NOTE   Il convient de faire la distinction entre les procédés d'exécution des colonnes, des panneaux et des structures de sol-ciment réalisés par jet, et les procédés d'injection couverts par l'EN 12715.

Izvedba posebnih geotehničnih del - Injektiranje pod visokimi pritiski

General Information

Status
Withdrawn
Publication Date
22-May-2001
Withdrawal Date
11-Dec-2018
ICS
93.020 - Earthworks. Excavations. Foundation construction. Underground works
Technical Committee
CEN/TC 288 - Execution of special geotechnical works
Drafting Committee
CEN/TC 288 - Execution of special geotechnical works
Current Stage
9960 - Withdrawal effective - Withdrawal
Completion Date
12-Dec-2018
Ref Project
SIST EN 12716:2002 - Execution of special geotechnical works - Jet grouting

Relations

Replaced By
EN 12716:2018 - Execution of special geotechnical work - Jet grouting
Effective Date
26-Jun-2013

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Execution of special geotechnical works - Jet groutingWLVNLExécution des travaux géotechniques spéciaux - Colonnes, panneaux et structures de sol-ciment réalisés par jetAusführung von besonderen geotechnischen Arbeiten (Spezialtiefbau) - Düsenstrahlverfahren (Hochdruckinjektion, Hochdruckbodenvermörtelung, Jetting)93.020Zemeljska dela. Izkopavanja. Gradnja temeljev. Dela pod zemljoEarthworks. Excavations. Foundation construction. Underground worksICS:SIST EN 12716:2002enTa slovenski standard je istoveten z:EN 12716:200101-julij-2002SIST EN 12716:2002SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 12716May 2001ICS 93.020English versionExecution of special geotechnical works - Jet groutingExécution des travaux géotechniques spéciaux - Colonnes,panneaux et structures de sol-ciment réalisés par jetAusführung von besonderen geotechnischen Arbeiten(Spezialtiefbau) - Düsenstrahlverfahren(Hochdruckinjektion, Hochdruckbodenvermörtelung,Jetting)This European Standard was approved by CEN on 16 April 2001.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2001 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 12716:2001 E

Page 2EN 12716:2001ContentspageForeword.31Scope.42Normative references.43Terms and definitions.44Specific needs.115Geotechnical investigation.126Materials.137Design considerations.147.1General.147.2Geometry.177.3Strength and Deformation Characteristics.177.4Permeability.178Execution.188.1General.188.2Equipment.198.3Preliminary works.208.4Drilling.208.5Jet grouting.218.6Spoil Return.218.7Placing the reinforcement.219Supervision, testing and monitoring.219.1General.219.2Preliminary tests.229.3Supervision and process testing.229.4Testing on the constructed elements.239.5Monitoring.2410Execution documents.2410.1Documents available on site.2410.2Documents to be produced on site.2511Special requirements.2511.1Compliance with national standards.2511.2Site safety.2511.3Protection of the environment.26Annex A (normative)
Additional design requirements.27Annex B (informative)
Ranges of jet grouting parameters.28Annex C (informative)
Indirect tests.29Annex D (informative)
Examples of site records of jet grouting works.30Annex E (informative)
Degree of obligation of the provisions.33Bibliography.35

Page 3EN 12716:2001ForewordThis European Standard has been prepared by Technical Committee CEN /TC 288, "Execution of specialgeotechnical works", the secretariat of which is held by AFNOR.This European Standard shall be given the status of a national standard, either by publication of an identical text orby endorsement, at the latest by November 2001, and conflicting national standards shall be withdrawn at the latestby November 2001.Annex A is normative, and the annexes B, C, D and E are informative.According to the CEN/CENELEC Internal Regulations, the national standards organizations of the followingcountries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland,France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden,Switzerland and the United Kingdom.

Page 4EN 12716:20011 ScopeThis Standard is applicable to the execution, testing and monitoring of jet grouting works. Design considerations,strictly related to jet grouting works only, are given in clause 7. More general requirements that could be includedin, or substituted by clauses of future editions of Eurocode 7 are listed in Annex A.NOTEThe jet grouting processes should be distinguished from the grouting processes covered by EN 12715.2 Normative referencesThis European Standard incorporates by dated or undated reference, provisions from other publications. Thesenormative references are cited at the appropriate places in the text and the publications are listed hereafter. Fordated references, subsequent amendments to or revisions of any of these publications apply to this EuropeanStandard only when incorporated in it by amendment or revision. For undated references the latest edition of thepublication referred to applies (including amendments).ENV 197-1:1992, Cement - Composition, specifications and conformity criteria - Part 1: Common cementsprEN 1008:1997, Mixing water for concrete - Specification for sampling, testing and assessing the suitability ofwater, including wash water from recycling installations in the concrete industry, as mixing water for concreteENV 1992-1-1:1991, Eurocode 2: Design of concrete structures - Part 1: General rules and rules for buildingsENV 1997-1:1994, Eurocode 7: Geotechnical design - Part 1: General rules3 Terms and definitionsFor the purposes of this European Standard, the following terms and definitions apply:3.1jet groutingthe jet grouting process consists of the disaggregation of the soil or weak rock and its mixing with, and partialreplacement by, a cementing agent; the disaggregation is achieved by means of a high energy jet of a fluid whichcan be the cementing agent itself3.2jet grouted elementa volume of soil treated through a single borehole. The most common elements are : jet grouted column : a cylindrical jet grouted element (Fig.1 a) ; jet grouted panel : a planar jet grouted element (Fig.1 b).3.3jet grouted structurean assembly of jet grouted elements which are partially or fully interlocked. The most common structures formedare : jet grouted diaphragm : a wall structure (Fig.2 a) ; jet grouted slab : a horizontal structure formed by essentially vertical jet grouting (Fig.2 b) ; jet grouted canopy : a structure formed by horizontal jet grouting – see 3.8 below (Fig.2 c) ; jet grouted block : a three-dimensional structure.

Page 5EN 12716:20013.4single systemthe jet grouting process in which the disaggregation and cementation of soil are achieved by a high energy jet of asingle fluid, usually a cement grout (Fig.3 a)3.5double (air) systemthe jet grouting process in which the disaggregation and the cementation of soil are achieved by one high energyfluid (usually a cement grout) assisted by an air jet shroud as a second fluid (Fig.3 b)3.6double (water) systemthe jet grouting process in which the disaggregation of the soil is achieved by a high energy water jet and itscementing is simultaneously obtained by a separate grout jet (Fig.3 c)3.7triple systemthe jet grouting process in which the disaggregation of the soil is achieved by a high energy water jet assisted byan air jet shroud, and its cementing is simultaneously obtained by a separate grout jet (Fig.3 d)NOTEIn special cases the water can be substituted
for other appropriate liquids or suspensions.3.8horizontal jet groutingtreatment performed from a horizontal or sub-horizontal borehole (within ± 20° from the horizontal plane)3.9jet grouting rigrotary rig able to automatically regulate the rotation and translation of the jet grouting string and tool3.10jet grouting stringjointed rods, with simple, double or triple inner conduit, which convey the jet grouting fluid(s) to the monitor3.11monitorthe tool mounted at the end of the jet grouting string, to enable jetting of the fluids into the ground3.12nozzlea specially manufactured device fitted into the monitor and designed to transform the high pressure fluid flow in thestring into the high speed jet directed at the soil3.13radius of influenceeffective distance of disaggregation of soil by the jet, measured from the axis of the monitor3.14spoil returnthe surplus mixture of soil particles and introduced fluids arising from the jet grouting process, and normally flowingto the ground surface via the annulus of the jetting borehole3.15jet grouting parametersthe jet grouting parameters are defined : pressure of the fluid(s) within the jet grouting string ; flow rate of the fluid(s) within the jet grouting string ; grout composition ; rotation speed of the jet grouting string ;

Page 6EN 12716:2001 rate of withdrawal or insertion of the jet grouting string.3.16prejettingthe method in which the jet grouting of an element is facilitated by a preliminary disaggregation phase, with a jet ofwater and/or other fluidsNOTEPrejetting is also widely known as prewashing or precutting.3.17fresh-in-fresh sequencethe sequence of work in which the jet grouted elements are constructed successively without waiting for the groutto harden in the overlapping elements (Fig.4 a)3.18primary-secondary sequencethe sequence of work in which the execution of an overlapping element cannot commence before a specifiedhardening time or achievement of predetermined strength of the adjacent elements previously constructed (Fig.4 b)3.19jet grouted materialthe material which constitutes the body of a jet grouted element3.20reinforced jet groutingjet grouted columns reinforced by steel or other high strength material

Page 7EN 12716:2001Figure 1 a) — Jet grouted columnFigure 1 b) — Jet
...

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