EP3489418B1 - Tête d'injection à haute efficacité pour injection de mélanges de fluides de consolidation sous pression dans le sol - Google Patents

Tête d'injection à haute efficacité pour injection de mélanges de fluides de consolidation sous pression dans le sol Download PDF

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Publication number
EP3489418B1
EP3489418B1 EP17203408.4A EP17203408A EP3489418B1 EP 3489418 B1 EP3489418 B1 EP 3489418B1 EP 17203408 A EP17203408 A EP 17203408A EP 3489418 B1 EP3489418 B1 EP 3489418B1
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EP
European Patent Office
Prior art keywords
conduit
injection head
injection
along
cylindrical body
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Application number
EP17203408.4A
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German (de)
English (en)
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EP3489418A1 (fr
Inventor
Olivier Haye
Sandro R. Gomes
Cesare Melegari
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VSL International Ltd
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VSL International Ltd
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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
    • E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil

Definitions

  • the present invention relates to an injection head for injecting a fluid mixture under pressure into the soil to consolidate it, as part of the technology known under the term "jet grouting", wherein this injection head provides significant improvements and in particular, a high efficiency with respect to the injection heads presently known and available on the market.
  • jet grouting are normally used to form columnar structures of artificial conglomerate in the soil, in order to consolidate it.
  • the binders disintegrate and are mixed with the surrounding soil, creating a conglomerate block, generally cylindrical in shape, which, once hardened, consolidates the soil.
  • the batteries of rods most commonly currently used in the area of foundations and soil consolidation provide a conduit of large cross section through which the mixture of water and cement is fed to a corresponding conduit, formed in the monitor, which in turn feeds the cement mixture under pressure, received from the battery of rods, to the zone of the monitor where the nozzles are present, with the latter housed in radially oriented holes, i.e. perpendicularly to the longitudinal axis of the monitor.
  • the conduit, formed in the monitor, which extends from the end region of the battery of rods to the nozzle area in order to feed to the latter the pressurised cementitious mixture usually has a cylindrical configuration and thus a constant section along its axial extension, so that the cement mixture, which flows into this conduit, assumes a substantially constant speed.
  • the cement mixture when flowing along the conduit and reaching the area of the nozzles, the latter being oriented in the direction normal to the longitudinal axis of the monitor and therefore of the cylindrical conduit, is subject to a sudden orthogonal deviation with respect to this axis.
  • the monitor or injection head for injecting consolidating fluid mixtures into the soil has the same limitation and disadvantage of a non-negligible loss of load and energy in the flow of consolidating mixture.
  • monitors are known from patent documents US 5,228,809 and EP 1 396 585 A1 . These monitors are characterised by specific configurations of the respective conduits, connecting an inlet zone of the monitor to an outlet nozzle apt to inject a fluid or consolidating mixture into the soil. They also have the same or similar problem of a loss of pressure and energy, in any way significant, in the consolidating mixture flow.
  • the primary object of the invention is to provide a monitor or injection head for injecting consolidating mixtures under pressure into the soil, exhibiting significantly improved performances compared to the known monitors currently in use.
  • this monitor or injection head has a high efficiency in terms of capability and penetrating power of the ejected jets, so as to obtain a greater and more effective disintegration effect of the soil to be treated and consolidated, for the same consumed energy.
  • a further object of the invention is to provide a monitor or injection head for injecting consolidating mixtures under pressure into the soil, which has a compact and optimised structure therefore suitable to be realised at a low and competitive cost.
  • an injection head for injecting pressurised consolidating fluid mixtures into the soil also commonly called in the art “monitor”, according to the present invention, is denoted as a whole by 10.
  • the injection head 10 of the invention comprises:
  • both the conduit 13, which connects the upper inlet 11a of the outer cylindrical body 11 to the outlet lateral nozzle 12, and also the injection hole 12a, of the outlet lateral nozzle 12, which injects the fluid mixture M in to the soil T exhibit an innovative configuration with respect to the one revealed by the injection holes and by the conduits of the injection heads according to the prior art.
  • This innovative configuration is characterised by one or more stabilising ridges or fins, each one denoted by 14, which are formed on the surface of the conduit 13 and of the injection hole 12a.
  • the stabilising ridges or fins extend along the axial development of the conduit 13 and of the injection hole 12a, i.e. from the area of the upper inlet 11a to the outlet area of the injection hole 12a and have the function of stabilising the flow of fluid or cementitious mixture M, which flows through the conduit 13 and the injection hole 12a.
  • the fluid mixture M that is fed to the injection head 10 by the battery B of tubular rods is typically constituted by a cementitious binder or similar material, sometimes called in jargon "grout", suitable for being injected at high pressure into the soil T to disintegrate it and form, once solidified, hard columns apt to consolidate it.
  • the outer cylindrical body 11 that extends along the central longitudinal axis Z of the injection head 10 has a composite structure composed of a plurality of parts, in particular:
  • the different parts of the outer cylindrical body 11 are firmly assembled and attached one to the other so as to form the outer cylindrical body 11.
  • the outer lower body 11b and the adapter outer body 11c are provided with threads 11' so as to be able to be firmly screwed one in the other to form the outer cylindrical body 11.
  • the adapter outer body 11c is provided with a further thread 11" so as to be apt to be screwed to a corresponding part, denoted by B' in Fig. 1 , of the tip of the battery B of tubular rods, when the injection head 10 is mounted on this battery B.
  • the conduit 13, which connects the upper inlet 11a of the outer cylindrical body 11 to the outlet lateral nozzle 12, is formed in a connection block 13a, in turn housed inside the outer cylindrical body 11 of the injection head 10, between the upper inlet area 11a and the outlet lateral nozzle 12, and is attached to the outer lower body 11b of the outer cylindrical body 11 by means of an attachment screw 16.
  • the conduit 13 has along its axial extension a section progressively decreasing from the upper inlet 11a to the outlet lateral nozzle 12, so that the fluid mixture M, that flows in the conduit 13 to feed the outlet lateral nozzle 12, acquires a progressively increasing speed v, as shown schematically in Fig. 2A by arrows v exhibiting larger dimensions the closer they are to the outlet lateral nozzle 12.
  • conduit 13 shown in the drawings comprises a straight and a curved parts
  • the conduit 13 can also have different configuration, for instance a curved shape along its entire axial extension.
  • the exact configuration of the conduit 13, while not being the salient feature of the present invention, has been the subject of complex and sophisticated mathematical calculations that take into account various factors and parameters and in particular are based on formulas that reflect fluid dynamic laws that govern the flow of the fluid mixture M in the conduit 13.
  • the fluid mixture M that flows in the conduit 13 and into the injection hole 12a, is subject to direction variations and therefore to accelerations and corresponding inertia forces that vary regularly and continuously, without abrupt changes, so as to limit to the maximum the onset and activation of turbulent motions that can reduce the efficiency and yield of the injection head 10.
  • FIGs. 2A-2C show, on a larger scale with respect to Fig. 1 , details of the conduit 13 and of the respective connection block 13a.
  • Figure 2A is a sectional view of the conduit 13 along the plane Z-X containing the axis 13c
  • Fig. 2B is a view in the direction defined by the arrow IIB of Fig. 2A
  • Fig. 2C is a sectional view along the plane defined by the line IIC-IIC of Fig. 2A .
  • the outlet lateral nozzle 12 is constituted, as shown in Figs. 3A-3D , by an outer body 12b in which the injection hole 12a extends along the respective X axis.
  • the outer body 12b in turn is housed in a corresponding seat 13b formed in the connection block 13a, which is accommodated inside the outer cylindrical body 11 and in which the conduit 13 extends to connect the upper inlet 11a to the outlet lateral nozzle 12.
  • a threaded sleeve 12c which can be screwed into a hole formed in the outer lower body 11b of the outer cylindrical body 11, has the function of securely attaching the outer body 12b of the outlet lateral nozzle 12 in the corresponding seat 13b formed in the connection block 13a.
  • the advantage of the indirect fixation mechanism of the nozzle 12 in the seat 13b, i.e. by the intermediate of the threaded sleeve 12c, is that it permits the precise orientation of the stabilizing ridges formed on the surface of the injection hole 12a towards those formed on the surface of the conduit 13.
  • a plurality of gaskets are inserted between the various parts which compose the outer cylindrical body 11 of the injection head 10, and between these parts and the connection block 13a through which the conduit 13 extends, for the purpose of ensuring an airtight seal between these parts and therefore preventing any seepage of the fluid mixture M under pressure out of the injection head 10.
  • a set of gaskets denoted by 15' are also inserted, in the area of the upper inlet 11a, between the inner adapter body 11d and a part, denoted by B", which is part of the tip of the battery B, in order to ensure the seal in the passage area of the fluid mixture M from the battery B to the injection head 10.
  • both the conduit 13, which connects the upper inlet 11a of the outer cylindrical body 11 to the outlet lateral nozzle 12, and the injection hole 12a, of the outlet lateral nozzle 12, which injects the fluid mixture M into the soil T have along their axial development, i.e. from the area of the upper inlet 11a to the area of the outlet of the injection hole 12a, one or more stabilising ridges or fins, each one denoted by 14. These are formed on the surface of the conduit 13 and of the injection hole 12a and are turned towards the centre of the same conduit 13 and of the same injection hole 12a.
  • These stabilising ridges 14 have the function of stabilising the flow of the fluid mixture M that flows along the conduit 13 and the injection hole 12a so as to provide high efficiency to the injection head 10 and a high disintegrating power to the jet of fluid mixture M, which is emitted from the outlet lateral nozzle 12 and injected into the soil T.
  • these one or more stabilising ridges 14 formed along the surface of the conduit 13 and of the injection hole 12a each have a triangular or cusp shape section.
  • the height of the stabilizing ridges 14 diminishes in the same manner as the section of the conduct 13.
  • these one or more stabilising ridges 14 are three in number and, viewed in section, are distributed evenly and equally distanced one from the other on the surface of the conduit 13 and of the injection hole 12a.
  • these one or more stabilising ridges 14 can extend along the entire axial extension of the conduit 13 and of the injection hole 12a, hence from the upper inlet area 11a to the outlet section of the injection hole 12a, or they can extend only along portions of the conduit 13 and of the injection hole 12a.
  • the injection head of the invention characterised by the stabilising ridges, advantageously has, compared to the injection heads and monitors currently known on the market, an extremely low load and energy loss in the flow of the fluid mixture which flows in the conduit and the outlet lateral nozzle, with the same energy used to feed under pressure the fluid mixture to the injection head as well as a very regular and extremely powerful and effective jet of the fluid mixture that is emitted outside by the injection lateral nozzle.
  • stabilising ridges that characterise the injection head of the invention.
  • These stabilising ridges have presumably the effect of producing a flow as laminar as possible of the fluid mixture, which flows along the conduit, and the injection hole of the outlet lateral nozzle.
  • a laminar flow represents a stream substantially free from turbulent motions, which, if they were present, would entail a significant loss of load and power of the same flow, particularly in the area adjacent to the injection hole in which the flow of fluid mixture undergoes the greatest change in direction.
  • the fluid threads which form the flow of fluid mixture along the conduit and the injection hole maintain a very regular trend practically free from turbulent motions, even in the areas of greatest change of direction. This results in a very low load and energy loss in the flow, as well as in an extremely powerful and effective jet of the fluid mixture out of the lateral nozzle.
  • the present invention achieves its predetermined aims and objectives and in particular proposes a novel and inventive injection head or monitor for the injection of a consolidating fluid mixture under pressure into the soil.
  • the novel and inventive injection head or monitor exhibits a high and improved efficiency with respect to known and conventional injections heads, with the same energy consumed to feed the fluid under pressure to the injection head, i.e. an improved and more advantageous ratio between the energy consumed to feed, via the battery of tubular rods, the fluid mixture under pressure to the injection head and the disaggregating power and consolidating capability of the jet of fluid mixture injected by the injection head into the soil.
  • the injection head of the invention produces and generates a jet of the fluid mixture injected into the soil having a disaggregating power and a consolidation capability of the soil significantly greater than those of the jet or of the jets injected into the soil by a conventional injection head fed with a fluid mixture at the same pressure of 400 bar.
  • the injection head of the invention is advantageously fed by the battery of tubular rods with a fluid mixture at a pressure that is substantially lower than that at which it is necessary to feed the same fluid mixture in a conventional injection head, therefore, with a lower energy consumption and also less wear in time of the overall soil consolidation equipment including both the battery of tubular rods and the injection head, in comparison to known and conventional injection heads.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Structural Engineering (AREA)
  • Agronomy & Crop Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Soil Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)

Claims (11)

  1. Tête d'injection (10) pour l'injection de mélanges de fluides de consolidation sous pression dans le sol (T), comprenant :
    - un corps cylindrique externe (11) définissant un axe longitudinal central (Z) et ayant une entrée supérieure (11a) coaxiale audit axe longitudinal central (Z) ;
    - au moins une buse latérale de sortie (12) placée dans ledit corps cylindrique externe (11) et définissant un trou d'injection (12a) s'étendant le long d'un axe respectif (X) substantiellement perpendiculaire à l'axe longitudinal central (Z) ; et
    - au moins un conduit (13) pour la connexion de l'entrée supérieure (11a) à la buse de sortie (12) ;
    dans laquelle le conduit (13) a le long de son extension axiale une section diminuant progressivement depuis la zone de l'entrée supérieure (11a) vers la zone de la buse latérale de sortie (12) ;
    la tête d'injection (10) étant caractérisée en ce que le conduit (13) et la buse latérale de sortie (12) ont un ou plusieurs stries de stabilisation (14) qui sont formées sur la surface du conduit (13) et du trou d'injection (12a) de la buse latérale de sortie (12) et qui s'étend le long de leur longueur,
    dans lequel lesdites une ou plusieurs stries (14) ont la fonction de stabiliser le flux de mélange de fluides (M) qui coule le long du conduit (13) et la buse latérale de sortie (12) de manière à conférer une haute efficacité à la tête d'injection.
  2. Tête d'injection (10) selon la revendication 1, dans laquelle le conduit (13) a une configuration incurvée qui s'étend et se développe dans ledit corps cylindrique externe (11) le long d'un axe incurvé respectif (13c) qui se connecte tangentiellement, dans une zone supérieure du conduit (13), à l'axe (Z) de l'entrée supérieure (11a), et, dans une zone inférieure du conduit (13), à l'axe (X) du trou d'injection (12a) de la buse latérale de sortie (12).
  3. Tête d'injection (10) selon les revendications 1 et 2, dans laquelle l'axe incurvé (13c), le long duquel le conduit (13) s'étend et se développe avec une section diminuant progressivement, se situe dans un plan longitudinal (Z-X) défini par l'axe longitudinal central (Z) du corps cylindrique externe de la tête d'infection (10) et par l'axe (X) de la buse latérale de sortie (12).
  4. Tête d'injection selon les revendications 1 à 3, dans laquelle lesdits une ou plusieurs stries de stabilisation (14), formées le long dudit conduit (13), a chacune une forme triangulaire ou de pointe en section.
  5. Tête d'injection selon l'une des revendications précédentes, dans laquelle lesdites stries de stabilisation (14), formées le long dudit conduit (13), sont trois en nombre et, vues en section, sont distribuées uniformément et sont à égale distance l'une de l'autre sur la surface du conduit.
  6. Tête d'injection selon l'une des revendications précédentes, dans laquelle l'axe incurvé (13c), le long duquel s'étend et se développe le conduit (13) qui connecte l'entrée supérieure à la buse latérale de sortie (12), a une forme incurvée clothoïdique.
  7. Tête d'injection selon l'une des revendications précédentes, dans laquelle lesdites une ou plusieurs stries de stabilisation (14) s'étendent le long de toute la longueur du conduit (13) et de la buse d'injection (12a) de la buse latérale de sortie (12), depuis la zone d'entrée supérieure (11a) vers la sortie du trou d'injection (12a).
  8. Tête d'injection selon l'une des revendications précédentes, dans laquelle ledit corps cylindrique externe (11) a une structure composée comprenant :
    - un corps inférieur externe (11b) placé dans la zone inférieure de la tête d'injection (10) et du corps cylindrique externe respectif (11) ; et
    - un adaptateur consistant à son tour en:
    - un corps adaptateur externe (11c) ; et
    - un corps adaptateur interne (11d) définissant un conduit rectiligne, correspondant à l'entrée supérieure (11a), s'étendant le long de l'axe central (Z) du corps cylindrique externe (11) ;
    dans laquelle ledit adaptateur a la fonction d'adapter la tête d'injection (10) à la pointe de la batterie (B) des barres tubulaires, sur lesquelles est monté, dans la zone d'entrée supérieure (11a), le corps cylindrique externe (11) de la même tête d'injection (10).
  9. Tête d'injection selon la revendication 8, dans laquelle ledit corps inférieur externe (11b) et ledit corps adaptateur externe (11c) du corps cylindrique externe (11) sont vissés l'un à l'autre, et ledit corps adaptateur externe (11c) est susceptible d'être vissé sur une partie correspondante (B') de la batterie (B) des barres tubulaires sur lesquelles la tête d'injection (10) peut être montée.
  10. Tête d'injection selon la revendication 8 ou 9, dans laquelle ledit conduit (13) est formé dans un bloc de connexion (13a) qui est placé et solidement fixé dans ladite tête d'injection (10), entre ledit corps adaptateur interne (11d) et ledit corps inférieure externe (11b).
  11. Tête d'injection selon la revendication 10, dans laquelle ladite buse latérale de sortie (12) comprend un corps externe (12b) logé dans un logement correspondant (13b) formé dans ledit bloc de connexion (13a) dans lequel ledit conduit (13) est formé et s'étend.
EP17203408.4A 2017-11-23 2017-11-23 Tête d'injection à haute efficacité pour injection de mélanges de fluides de consolidation sous pression dans le sol Active EP3489418B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP17203408.4A EP3489418B1 (fr) 2017-11-23 2017-11-23 Tête d'injection à haute efficacité pour injection de mélanges de fluides de consolidation sous pression dans le sol

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17203408.4A EP3489418B1 (fr) 2017-11-23 2017-11-23 Tête d'injection à haute efficacité pour injection de mélanges de fluides de consolidation sous pression dans le sol

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EP3489418A1 EP3489418A1 (fr) 2019-05-29
EP3489418B1 true EP3489418B1 (fr) 2020-06-03

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Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5228809A (en) 1989-01-27 1993-07-20 Kajima Corporation Consolidating agent injecting apparatus and injecting apparatus for improving ground
FR2820780B1 (fr) * 2001-02-12 2003-05-02 Cie Du Sol Tete d'injection sous pression d'un liquide pour forer une excavation dans le sol
FR2843609B1 (fr) 2002-08-13 2004-10-29 Cie Du Sol Tete d'injection sous pression d'un fluide pour desagreger le terrain a partir d'un forage
ITTO20080335A1 (it) * 2008-05-06 2009-11-07 Trevi Spa Testa di iniezione per l'esecuzione di tecniche di jet grouting
IT1401219B1 (it) 2010-07-15 2013-07-12 Trevi Spa Testa di iniezione per iniettare miscele consolidanti fluide pressurizzate nel terreno.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

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