EP2787123B1 - Procédé de réalisation d'une semelle étanche et semelle étanche - Google Patents

Procédé de réalisation d'une semelle étanche et semelle étanche Download PDF

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Publication number
EP2787123B1
EP2787123B1 EP13162101.3A EP13162101A EP2787123B1 EP 2787123 B1 EP2787123 B1 EP 2787123B1 EP 13162101 A EP13162101 A EP 13162101A EP 2787123 B1 EP2787123 B1 EP 2787123B1
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EP
European Patent Office
Prior art keywords
water
mixing water
mixing
metal ions
sealing material
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP13162101.3A
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German (de)
English (en)
Other versions
EP2787123A1 (fr
Inventor
Lars Liersch
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bauer Spezialtiefbau GmbH
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Bauer Spezialtiefbau GmbH
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Priority to EP13162101.3A priority Critical patent/EP2787123B1/fr
Publication of EP2787123A1 publication Critical patent/EP2787123A1/fr
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D19/00—Keeping dry foundation sites or other areas in the ground
    • E02D19/22—Lining sumps in trenches or other foundation pits

Definitions

  • the invention relates to a method for producing a sealing sole according to the preamble of claim 1 and to a sealing sole according to the preamble of claim 13.
  • a construction pit enclosure For construction pits whose soles are below a groundwater level, a construction pit enclosure is generally required.
  • the construction pit enclosure is intended to prevent groundwater from entering the excavation pit.
  • a substantially horizontal sealing layer In the event that there is no horizontal, water-blocking soil layer, a substantially horizontal sealing layer must be created for the construction pit closure.
  • a sealing sole made of cement is introduced in a bottom region below the excavation bottom.
  • Such caoutchouc from cement are complex and remain after completion of construction.
  • a so-called silicate gel injection method is furthermore known, in which a silicate based on water glass is injected into a porous bottom region below the excavation bottom. For this purpose, injection holes are made at predetermined intervals up to the porous bottom layer and introduced valve body. By pumping in an injection medium, a spherical or disk-shaped silicate gel body is formed around the injection site generated.
  • the sealing sole is formed by a multiplicity of injection bodies produced in this way.
  • the silicate gel does not harden, but forms a gel-like structure to produce the water-impermeable layer. Due to the better flowability of the silicate gel these sealing sols can be created faster and cheaper compared to the other methods.
  • the DE 102 18 771 B4 describes a method for producing a construction pit enclosure for sealing a pit against groundwater, wherein a substantially vertical enclosing wall and a substantially horizontally extending sealing sole are created.
  • the sealing sole is produced by injecting an injection medium in a porous bottom region below the bottom of the excavation pit, wherein the injection medium is taken up in pores of the bottom region and formed here by a water-impermeable layer in the bottom region.
  • the injection medium is a mixture comprising at least one sealant base and a hardener which is a metal salt solution.
  • the silicate gel sole produced in a targeted manner in the sandy soil is produced via the determined pore space of the sand and the injection quantity necessary for complete filling.
  • the injection medium penetrates the pores via an injection source, fills them and, in this way, after solidification of the solution, causes the formation of a silicate gel sole for sealing.
  • it is essential to know the size of a single silica gel body produced in the soil layer at a given injection pressure.
  • relatively large dimensional variations can result.
  • the invention is therefore based on the object to provide a method for creating a sealing slab which is particularly economical and at the same time be produced with high tightness. It is another object of the invention to provide such a sealing sole.
  • the object is achieved by a method for creating a sealing sole with the features of claim 1 and a sealing sole with the Characteristics of claim 13 solved.
  • Preferred embodiments of the invention are specified in the respective dependent claims.
  • the invention is based on the recognition that a proportion of metal ions in the mixing water used for sealing sols has a significant influence on the size of an injection body.
  • the metal ions lead with the ingredients of the sealant base to reactions and interactions, which may result in significant changes in viscosity. These can result in insufficient expansion of the injection body with a reduced volume.
  • the metal ion content can vary greatly.
  • the seal base obtained by mixing the sealant base and especially a hardener with the pretreated tie-up water with bound metal ions has a uniform viscosity, good flow properties and uniform spreading properties.
  • the necessary production costs can be considerably reduced since, in particular, necessary safety margins for expenses in the drainage and reworking of the injection are no longer necessary.
  • the yield of the sealant base used is increased by the inventive method.
  • a complexing agent for metal ions in particular alkaline earth metal ions, is added, by means of which the metal ions are bound from the mixing water.
  • Complexing agents have a very high selectivity and affinity for specific metal ions, so that they are specifically bound by the complexing agent and thus can no longer develop chemical action in the mixing water.
  • these are alkaline earth metal ions, especially calcium and magnesium, which, in the form of their sparingly soluble salts, in particular the carbonates, can lead to undesired precipitations and deposits in the sealing sole.
  • the proportion of these leading to insoluble precipitates ions is known under the name of the so-called water hardness.
  • water hardness refers to the equivalent concentration of the ions of the alkaline earth metals dissolved in the water, in special contexts but also their anionic partners.
  • the hardness formers include mainly calcium and magnesium ions and traces of strontium and barium ions.
  • the dissolved hardness formers can form insoluble compounds, especially lime and lime soaps. This tendency towards the formation of insoluble compounds is the reason for the consideration of dissolved alkaline earths, which has led to the emergence of the conceptual and theoretical system around the hardness of water.
  • the complexing agent selected from the group consisting of polyaspartates, polysuccinates, succinic acid, zeolites or mixtures thereof.
  • the complexing agent is added to the mixing water in a concentration of 0.05% to 3% by volume.
  • the complexing agent can effectively fulfill its effect of binding the interfering metal ions.
  • the effect is too low, while at higher concentrations there is no additional effect, since the metal ions to be bound are present only in a very limited concentration.
  • the added amount of complexing agents must therefore be based on the supply of the measured concentration of the metal ions present in the mixing water.
  • the water hardness of the groundwater surrounding the excavation also plays a role for the concentration range of the complexing agent to be selected, since the sealing bottom also comes into contact with the groundwater.
  • the ions can also be removed by precipitation to form a sparingly soluble compound from the mixing water.
  • the resulting sparingly soluble precipitate can be removed by various types of filtration or by other methods, for example by centrifugation. Filtration offers itself as a particularly suitable method, as it allows in a relatively efficient manner to remove a large amount of unwanted metal ions from the mixing water in a relatively short time.
  • the filtration of the suspension formed can be carried out either by a static filtration or a dynamic filtration.
  • the systems work either in batch mode or partially continuously with simultaneous filtering and backwashing.
  • the recovered solid containing the metal ions can then be used for further applications, for example in the construction industry.
  • sealant base is a water-based colloidal solution.
  • the preparation of the injection medium based on water is both in terms of cost particularly favorable and environmentally neutral groundwater.
  • the glue-like solution can be prepared in particular on the basis of silicates.
  • ion exchangers By appropriate treatment with ion exchangers, a desired ion content and pH can be adjusted.
  • the sealant base is a silica sol.
  • Silica sol is generally understood to mean an aqueous solution of colloidal silicates designated (SiO 2 ) x x nH 2 O. Such a sealant is also referred to as silicate gel sole.
  • silica is present in the form of mutually uncrosslinked, spherical individual particles which are hydroxylated on the surface. It has been found that silica sol is incorporated into the soil, especially when a metal salt hardener is added, to give a silicate gel sole having excellent sealing properties at a neutral pH.
  • the particle size of the SiO 2 particles in the silica sol is from 5 to 150 nm.
  • the particle size can be adjusted in the preparation of the silica sol and adjusted to the porosity of the soil into which the silica sol is introduced to form the water-impermeable layer.
  • the injection medium consists of 60 to 80% by weight of water, up to 10% by weight of water glass, 10 to 30% by weight of silica sol and 0.1 to 3% by weight of complexing agent.
  • the injection medium has a sufficiently long gel time, it is thereby in particular significantly above the Verpressdauer, which is generally at least 20 minutes.
  • the proportion of complexing agents is this is sufficient to achieve almost complete removal of the interfering calcium and magnesium ions over a wide range of possible water hardnesses of the mixing water or groundwater.
  • the specific proportion of the complexing agent has to be based on the specific conditions of the construction site, which are to be determined by appropriate preliminary tests and measurements.
  • the gel time of the silica sol can be adjusted.
  • the higher the percentage of the hardener on the injection medium the faster the injection medium assumes a stable gel-like structure.
  • the proportion of the silica sol in the injection medium both the stability and the tightness of the dense base to be produced can be influenced.
  • the invention further relates to a sealing sole, in particular for a Baugrubenumschmother in which in a porous soil layer under pressure an injection medium is injected, which is prepared by mixing at least one sealant base with mixing water.
  • a sealing sole in particular for a Baugrubenumschmother in which in a porous soil layer under pressure an injection medium is injected, which is prepared by mixing at least one sealant base with mixing water.
  • the sealing sole it is provided that the mixing water is pretreated, metal ions being bound from the mixing water.
  • Elements of the alkaline earth metal group that is mainly calcium and magnesium, which may lead to undesired precipitations in conjunction with the carbonate dissolved in the mixing water or groundwater, are particularly suitable as interfering metal ions.
  • the removal of the metal ions ensures that the produced sealing sole has a uniform viscosity, flow properties and propagation properties.
  • the metal ions can be either bound via a complexing agent to form chelate complexes or removed by precipitation as sparingly soluble salt from the mixing water.
  • the sealing sole according to the invention in particular the spreading behavior and the yield of the silicate gel used as sealant base material are improved.
  • deposits are reduced, inadequate spreads are eliminated, and finally a volume of the sealing sole that is up to 30% larger is achieved.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Soil Conditioners And Soil-Stabilizing Materials (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)

Claims (13)

  1. Procédé de mise en place d'une semelle d'étanchéité, en particulier pour un mur de soutènement, selon lequel on injecte dans une couche du sol poreuse un milieu d'injection, qui est constitué en mélangeant au moins un matériau de base d'étanchéité à de l'eau de gâchage,
    caractérisé :
    en ce qu'avant le mélange, l'eau de gâchage est prétraitée, de telle sorte que des ions de métal sont liés dans l'eau de gâchage.
  2. Procédé selon la revendication 1,
    caractérisé :
    en ce que, pour le prétraitement de l'eau de gâchage, on ajoute un agent complexant pour des ions de métal, en particulier de métal alcalino-terreux, par lequel les ions de métal sont liés à partir de l'eau de gâchage.
  3. Procédé selon la revendication 2,
    caractérisé :
    en ce que l'agent complexant est choisi dans le groupe constitué de polyaspartates, de polysuccinates, de l'acide succinique, de zéolites, ou de mélanges de ceux-ci.
  4. Procédé selon la revendication 2 ou 3,
    caractérisé :
    en ce que l'agent complexant est ajouté à l'eau de gâchage en une concentration comprise entre 0,05 % en volume et 3 % en volume.
  5. Procédé selon une des revendications 2 à 4,
    caractérisé :
    en ce que les ions de métal liés sont séparés de l'eau de gâchage, et, plus particulièrement, filtrés.
  6. Procédé selon une des revendications 1 à 5,
    caractérisé :
    en ce que le matériau de base d'étanchéité est une solution colloïdale à base d'eau.
  7. Procédé selon la revendication 6,
    caractérisé :
    en ce que le matériau de base d'étanchéité contient, en tant que composants, du verre soluble et un sol de silice.
  8. Procédé selon la revendication 7,
    caractérisé :
    en ce que la taille de particule des particules de SiO2 dans le sol de silice est comprise entre 5 et 150 nm.
  9. Procédé selon une des revendications 1 à 8,
    caractérisé :
    en ce qu'on utilise un agent de durcissement sous la forme d'un sel de métal avec des cations monovalents et/ou polyvalents.
  10. Procédé selon une des revendications 7 à 9,
    caractérisé :
    en ce que le milieu d'injection est composé de 60 à 80 % d'eau en poids, de 2 à 10 % de verre soluble en poids, de 10 à 30 % de sol de silice en poids et de 0,1 à 3 % d'agent de formation de complexe en poids.
  11. Procédé selon une des revendications 1 à 10,
    caractérisé :
    en ce que l'eau de gâchage prétraitée est mélangée d'abord avec l'agent de durcissement et, ensuite, avec le matériau de base d'étanchéité.
  12. Procédé selon une des revendications 1 à 11,
    caractérisé :
    en ce que, lors du prétraitement, on opère un réglage d'une dureté de l'eau de 0° dH de l'eau de gâchage.
  13. Semelle d'étanchéité, en particulier pour un mur de soutènement, pour laquelle on injecte dans une couche du sol poreuse un milieu d'injection, qui est constitué en mélangeant au moins un matériau de base d'étanchéité à de l'eau de gâchage,
    caractérisé :
    en ce que l'eau de gâchage est prétraitée, de telle sorte que des ions de métal sont liés dans l'eau de gâchage.
EP13162101.3A 2013-04-03 2013-04-03 Procédé de réalisation d'une semelle étanche et semelle étanche Active EP2787123B1 (fr)

Priority Applications (1)

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EP13162101.3A EP2787123B1 (fr) 2013-04-03 2013-04-03 Procédé de réalisation d'une semelle étanche et semelle étanche

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13162101.3A EP2787123B1 (fr) 2013-04-03 2013-04-03 Procédé de réalisation d'une semelle étanche et semelle étanche

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EP2787123A1 EP2787123A1 (fr) 2014-10-08
EP2787123B1 true EP2787123B1 (fr) 2015-08-12

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3650603A1 (fr) 2018-11-12 2020-05-13 BAUER Spezialtiefbau GmbH Procédé de fabrication d'un dallage d'étanchéité dans le sol
EP4060122A1 (fr) 2021-03-18 2022-09-21 BAUER Spezialtiefbau GmbH Système et procédé de préparation d'une solution de gel de silicate d'injection destinée à l'injection dans un sol

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3690005B1 (fr) 2019-01-31 2023-08-16 Keller Holding GmbH Milieux d'injection permettant d'étanchéifier le terrain à bâtir et procédé de fabrication d'un milieux d'injection
EP3708715B1 (fr) * 2019-03-15 2022-01-19 BAUER Spezialtiefbau GmbH Procédé de fabrication d'une clôture de fosse de chantier dans le sol
CN112081125A (zh) * 2020-10-09 2020-12-15 北京中岩大地科技股份有限公司 潜水砂卵石地层基坑封底结构及施工工艺

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19752180C1 (de) * 1997-11-25 1999-07-29 Keller Grundbau Gmbh Verfahren zum Herstellen einer Dichtsohle nach dem Düsenstrahlverfahren
DE10218771B4 (de) * 2001-05-18 2006-06-08 Bauer Spezialtiefbau Gmbh Baugrubenumschließung und Verfahren zum Herstellen einer Baugrubenumschließung
DE20114212U1 (de) * 2001-05-18 2001-11-08 Bauer Spezialtiefbau Gmbh, 86529 Schrobenhausen Abdichtungssohle, Baugrubenumschließung und Injektionsmedium zum Herstellen der Abdichtsohle

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3650603A1 (fr) 2018-11-12 2020-05-13 BAUER Spezialtiefbau GmbH Procédé de fabrication d'un dallage d'étanchéité dans le sol
US11459724B2 (en) 2018-11-12 2022-10-04 Bauer Spezialtiefbau Gmbh Method for producing a sealing base in the ground
EP4060122A1 (fr) 2021-03-18 2022-09-21 BAUER Spezialtiefbau GmbH Système et procédé de préparation d'une solution de gel de silicate d'injection destinée à l'injection dans un sol
WO2022194704A1 (fr) 2021-03-18 2022-09-22 Bauer Spezialtiefbau Gmbh Système et procédé de production d'une solution de gel de silicate pour injection dans un sol

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