EP2933380B1 - Tête d'injection pour une injection à haute pression de suspension dans un sol - Google Patents

Tête d'injection pour une injection à haute pression de suspension dans un sol Download PDF

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Publication number
EP2933380B1
EP2933380B1 EP14165047.3A EP14165047A EP2933380B1 EP 2933380 B1 EP2933380 B1 EP 2933380B1 EP 14165047 A EP14165047 A EP 14165047A EP 2933380 B1 EP2933380 B1 EP 2933380B1
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EP
European Patent Office
Prior art keywords
injection
air
injection head
flush fluid
head according
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.)
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Application number
EP14165047.3A
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German (de)
English (en)
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EP2933380A1 (fr
Inventor
Dominik Hartmann
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 EP14165047.3A priority Critical patent/EP2933380B1/fr
Priority to CA2886940A priority patent/CA2886940A1/fr
Publication of EP2933380A1 publication Critical patent/EP2933380A1/fr
Application granted granted Critical
Publication of EP2933380B1 publication Critical patent/EP2933380B1/fr
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Classifications

    • 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 invention relates to an injection head for a high-pressure injection of suspension into a floor area, comprising a tubular base body, an upper connection area, a lower connection area, at least one radially directed injection nozzle, at least one injection line, which is suitable for supplying a suspension of injection from the upper connection area to the at least one an injection nozzle, at least one air conduit extending to supply air from the upper port region to the at least one injection nozzle, at least one purge fluid passage extending to direct a purge fluid to the lower port region, and valve means for opening and closing the purge fluid passage , according to the preamble of claim 1.
  • Such injection heads are usually used on a drill pipe.
  • the drill pipe is used first to create a borehole in the ground.
  • a flushing fluid is usually passed through the drill pipe to the lower drilling tool to cool it.
  • the flushing fluid serves to convey excavated soil along the outside of the drill string up the wellbore.
  • a sealing and / or hardening injection suspension is introduced into the bottom area via the at least one radially directed injection nozzle.
  • a disc-shaped or rotational injection body can thus be created in the soil.
  • sealing material can so for example by a Variety of adjacent holes to create a so-called seal base in the soil.
  • a generic injection head is from the DE 20 2007 002 177 U1 known.
  • a central channel is used both for supplying the rinsing fluid and for supplying the injection suspension. Due to the process, the rinsing suspension is first supplied via the central channel, which is required until the desired drilling depth is reached. The flushing fluid is passed through the injection head at a relatively low pressure of a few bar. Subsequently, to form the injection body through the central channel at a high pressure of up to several 100 bar, the suspension of injection is initiated.
  • a valve device is arranged with a spring-loaded valve disk. Due to the high injection pressure, the valve disk is pressed downwards against the action of the spring, thus sealing the channel which continues downwards. In this way, the injection suspension is now injected radially outwardly into the surrounding soil through the radially directed injection nozzles. At the same time, compressed air can be fed into the area around the injection nozzles via lateral supply channels.
  • valve device is arranged in the injection channel in the region of the injection nozzles. This results in a very abrupt transition between the axial injection line and the radial injection nozzles. This is unfavorable in terms of flow and leads to a noticeable pressure loss. This pressure loss means a smaller spread of the injection beam at an increased energy consumption and thus a lower overall efficiency of the injection head.
  • Another injection head goes out of the EP 1 527 235 B1 out. However, in this injection head, no purge passage is provided to direct purge fluid through the injection head to the underlying drilling tool.
  • the invention has for its object to provide an injection head for a high-pressure injection of suspension in a soil, by which on the one hand efficiently flushing fluid can be passed through and on the other hand particularly efficient injection suspension can be supplied to the injection nozzles.
  • the injection head according to the invention is characterized in that the flushing fluid duct is conductively connected to the air duct via a connection region, that the valve device is arranged in the connection region between the flushing fluid duct and the air duct and that the valve device is designed to block the flushing fluid duct when air enters the connection region has flowed.
  • the flushing fluid is passed partly through the air line and partly through the flushing fluid channel through the injection head.
  • the injection line can be kept free from a valve device in the region of the at least one injection nozzle and streamlined. This allows a particularly low pressure loss delivery of the suspension for injection to the at least one injection nozzle. Due to the very high pressure of the injection suspension, which can be up to several 100 bar, means a streamlined design a saving of energy to reach the desired pressure level. In addition, with the same pump performance due to the streamlined design, an improved injection width for the suspension of injection into the soil can be achieved.
  • connection area is formed as a receiving area in which a valve body is movably mounted.
  • the flushing fluid channel can thus be closed by the valve body when the compressed air flows in, so that the compressed air flows into the region of the injection nozzle.
  • the valve body can be adjusted so that the air line is closed to the injection nozzle and at the same time the flushing fluid channel is open down to the drilling tool.
  • the valve body can be controlled and adjusted by an adjusting element, such as an actuating cylinder, from the outside.
  • an advantageous embodiment of the injection head according to the invention is that the receiving space has an upper outlet opening for directing the air to the injection nozzle and a lower outlet opening for guiding the flushing fluid to the lower connection area.
  • the flushing fluid which is usually water or a suspension based on water, discharged down, while for the lighter air, an upper outlet opening is provided in the receiving space. Via this upper outlet opening, the air can flow to the injection nozzle via an air channel, which is part of the air line.
  • valve body has a density which is higher than that of the air and which is smaller than that of the flushing fluid.
  • the freely movable valve body floats on the flushing fluid due to the low density.
  • the valve body can close an overhead opening, through which air can flow to the injection nozzle. By floating the valve body can be released and opened at the same time a lower outlet opening for Spülfluidkanal.
  • the valve body can have any suitable shape, such as conical, double-cone or disk-shaped.
  • a particularly robust and reliable for the valve function embodiment is achieved according to the invention in that the valve body is designed as a ball which is freely floating stored in the receiving space. In a spherical shape, a possible tilting of the valve body in the receiving space is generally avoided.
  • the ball can be made of metal, plastic or other material. To achieve the desired density, the ball may be provided with a cavity.
  • a further preferred embodiment according to the invention is that the receiving space in the region of the upper outlet opening and / or the lower outlet opening has a conical wall portion which is formed as a valve seat for the valve body.
  • conical wall section is to be understood that this not only pure conical but also may have a certain arcuate shape in cross-sectional view.
  • the design of the wall section is adapted to the valve body, that a reliable annular contact and sealing surface between the respective wall portion and the valve body is formed.
  • a particularly compact embodiment of the injection head is achieved according to a preferred embodiment in that the at least one air duct is formed at least in sections for the passage of air and flushing fluid.
  • a particularly streamlined design of the injection head is achieved according to an embodiment of the invention in that the injection line is arranged centrally in the base body and is connected via a manifold section with the injection nozzle.
  • the manifold section is designed to be aerodynamically favorable, so that as low-pressure as possible a diversion of the injection fluid flowing in under high pressure into the radial direction to the injection nozzle is ensured.
  • a further embodiment variant of the invention consists in that an air duct of the air duct opens into an annular nozzle which surrounds the injection nozzle.
  • the liquid jet from the injection nozzle is covered by an air jet, so that friction and energy losses of the injection jet are reduced.
  • the air duct as part of the air line extends between the annular nozzle and the receiving space.
  • valve device is arranged below the injection nozzle. This provides for the formation of the injection line a great deal of creative freedom.
  • the valve device can be easily arranged below the injection nozzle, since then only the high pressure air to the injection nozzle must flow from the valve device, while the flushing fluid can be directed down to the drilling tool.
  • the invention further comprises an injection device for carrying out a high-pressure injection of suspension into a soil, with an injection linkage, wherein the injection device is characterized in that at least one injection head, as previously described, is arranged on the injection linkage.
  • an injection head can have a single injection nozzle or several injection nozzles.
  • the injection device is preferably further developed in that a pumping device is provided for supplying an injection suspension, of air and / or flushing fluid to the injection head through the drill pipe.
  • the pumping device can in each case a single pump for the different fluids exhibit.
  • the injection device can be arranged in a known manner on a drill, so that a drill hole can be created in a known manner with the injection rod and a drill attached to the lower end.
  • the single figure shows a schematic cross-sectional view through part of an injection head according to the invention.
  • the injection head 10 shown in the drawing comprises a tubular base body 12, which has an upper connection region 14 and a lower connection region 16 for connection to an injection or drill string.
  • the actual connection areas 14, 16 with a well-known threaded connection are not shown in the partial figure representation.
  • the tubular base body 12 Approximately centrally in the tubular base body 12 extends a channel-like injection line 22, which is passed via an arcuate manifold section 24 radially into an injection nozzle 20.
  • the manifold portion 24 is designed aerodynamically to avoid unnecessary pressure losses.
  • the injection nozzle 20 is formed as a sleeve-shaped component, which is inserted into the base body 12.
  • an air line 28 For supplying compressed air and also a flushing fluid, which is required during the drilling process, an air line 28 is provided, which opens via an inlet opening 29 in an enlarged, cavity-like connection region 32.
  • the air line 28 is formed radially offset from the injection line 22 up to the lateral inlet opening 29 and extends downwards from the upper connection region 14.
  • the air line 28 may be partially annular and surround the injection line 22. In the section between the upper connection region 14 and the inlet opening 29, the air line 28 serves both to conduct the compressed air and the rinsing fluid.
  • a valve device 50 is formed, which uses the connection region 32 as a receiving space 52 for receiving a spherical valve body 54.
  • the receiving space 52 has in its upper ceiling area above the inlet opening 29, an upper outlet opening 56, from which an approximately transverse air duct 60 as part of the air line 28 extends from the receiving space 52 to the injection nozzle 20.
  • the air channel 60 opens into an annular channel 61, which surrounds the injection nozzle 20 in an annular manner.
  • the radial outer side of the injection nozzle 20 is surrounded by a nozzle ring disk 27 at a defined distance. Between the injection nozzle 20 and the nozzle ring disk 27, an annular gap is formed, which forms an annular nozzle 26 for the outflow of compressed air around the jet of the injection suspension from the injection nozzle 20.
  • flushing fluid channel 30 extends from the lower outlet opening 58 to the lower connection region 16 of the injection head 10.
  • flushing fluid can be conducted from the upper connection region 14 to the lower connection region 16 in the direction of the drilling tool via the first section of the air line 28, the connection region 32 and the flushing fluid channel 30 ,
  • rinsing fluid is first supplied via the air line 28, which can also be called a supply line, from the upper connection region 14 into the receiving space 52 of the valve device 50. Due to the lower density of the valve body 54, this floats on the liquid flushing fluid. Due to a throttle-like constriction of the Spülfluidkanales 30 following the lower outlet opening 58, the receiving space 52 fills with flushing fluid, so that the spherical valve body 54 is pressed against an upper conical wall portion 62 of the receiving space 52. As a result, the transversely directed air channel 60 is closed in a fluid-tight manner with respect to the receiving space 52 by the valve body 54.
  • the air line 28 can also be called a supply line
  • the upper conical wall portion 62 serves as a valve seat for the valve body 54. In this state, therefore flushing fluid can flow unhindered via the air line 28 into the receiving space 52 and flow down through the lower outlet port 58 to the Spülfluidkanal 30 and the drilling tool.

Landscapes

  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Soil Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Agronomy & Crop Science (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)
  • Earth Drilling (AREA)

Claims (12)

  1. Tête d'injection pour une injection à haute pression de suspensions dans un sol, avec :
    - un corps de base (12) de forme tubulaire,
    - une partie de raccordement supérieure (14),
    - une partie de raccordement inférieure (16),
    - au moins une buse d'injection (20) dirigée de manière radiale,
    - au moins une conduite d'injection (22), qui, pour la fourniture de suspensions d'injection à partir de la partie de raccordement supérieure (14), s'étend vers la au moins une buse d'injection (20),
    - au moins une conduite d'air (28), qui, pour la fourniture d'air à partir de la partie de raccordement supérieure (14), s'étend vers la au moins une buse d'injection (20),
    - au moins un canal de fluide de rinçage (30), qui, pour l'apport d'un fluide de rinçage, s'étend vers la partie de raccordement inférieure (16), et
    - un dispositif de soupape (50) pour l'ouverture et la fermeture du canal de fluide de rinçage (30),
    caractérisée :
    - en ce que le canal de fluide de rinçage (30) est raccordé à la conduite d'air (28) par l'intermédiaire d'une région de liaison (32),
    - en ce que le dispositif de soupape (50) est disposé dans la région de liaison (32), entre le canal de fluide de rinçage (30) et la conduite d'air (28), et
    - en ce que le dispositif de soupape (50) est constitué de manière à fermer le canal de fluide de rinçage (30) si de l'air est mis en circulation dans la région de liaison (32).
  2. Tête d'injection selon la revendication 1,
    caractérisée :
    en ce que la région de liaison (32) est constituée sous la forme d'un espace de réception (52), dans lequel un corps de soupape (54) est monté en y étant mobile.
  3. Tête d'injection selon la revendication 2,
    caractérisée :
    en ce que l'espace de réception (52) comprend une ouverture de sortie supérieure (56), pour la conduite de l'air vers la buse d'injection (20), et une ouverture de sortie inférieure (58), pour la conduite du fluide de rinçage vers la partie de raccordement inférieure (16).
  4. Tête d'injection selon la revendication 2 ou 3,
    caractérisée :
    en ce que le corps de soupape (54) comporte une densité qui est plus élevée que celle de l'air et qui est plus faible que celle du fluide de rinçage.
  5. Tête d'injection selon une des revendications 2 à 4,
    caractérisée :
    en ce que le corps de soupape (54) est constitué sous la forme d'une bille, qui est montée dans l'espace de réception (52) en y flottant librement.
  6. Tête d'injection selon une des revendications 1 à 5,
    caractérisée :
    en ce que l'espace de réception (52) comprend dans la zone de l'ouverture de sortie supérieure (56) et/ou de l'ouverture de sortie inférieure (58) une section de paroi conique (62, 64), qui est constituée sous la forme d'un siège de soupape pour le corps de soupape (54).
  7. Tête d'injection selon une des revendications 1 à 6,
    caractérisée :
    en ce que la au moins une conduite d'air (28) est constituée au moins en partie pour le passage d'air et de fluide de rinçage.
  8. Tête d'injection selon une des revendications 1 à 7,
    caractérisée :
    en ce que la conduite d'injection (22) est disposée en position centrale dans le corps de base (12) et est reliée à la buse d'injection (20) par l'intermédiaire d'une section coudée (24).
  9. Tête d'injection selon une des revendications 1 à 8,
    caractérisée :
    en ce qu'un canal d'air (60) de la conduite d'air (28) aboutit dans une buse annulaire (26), qui entoure la buse d'injection (20).
  10. Tête d'injection selon une des revendications 1 à 9,
    caractérisée :
    en ce que le dispositif de soupape (50) est disposé au-dessous de la buse d'injection (20).
  11. Dispositif d'injection pour la mise en oeuvre d'une injection à haute pression de suspensions dans un sol, avec une tige d'injection,
    caractérisé :
    en ce qu'au moins une tête d'injection (10) selon une des revendications 1 à 10 est disposée sur la tige d'injection.
  12. Dispositif d'injection selon la revendication 11,
    caractérisé :
    en ce qu'un dispositif de pompage est prévu à travers la tige d'injection pour l'apport de suspensions d'injection, d'air et/ou de liquide de rinçage à la tête d'injection (10).
EP14165047.3A 2014-04-17 2014-04-17 Tête d'injection pour une injection à haute pression de suspension dans un sol Active EP2933380B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP14165047.3A EP2933380B1 (fr) 2014-04-17 2014-04-17 Tête d'injection pour une injection à haute pression de suspension dans un sol
CA2886940A CA2886940A1 (fr) 2014-04-17 2015-03-31 Tete d'injection pour une injection haute pression d'une suspension dans le sol

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14165047.3A EP2933380B1 (fr) 2014-04-17 2014-04-17 Tête d'injection pour une injection à haute pression de suspension dans un sol

Publications (2)

Publication Number Publication Date
EP2933380A1 EP2933380A1 (fr) 2015-10-21
EP2933380B1 true EP2933380B1 (fr) 2016-08-24

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ID=50486818

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14165047.3A Active EP2933380B1 (fr) 2014-04-17 2014-04-17 Tête d'injection pour une injection à haute pression de suspension dans un sol

Country Status (2)

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EP (1) EP2933380B1 (fr)
CA (1) CA2886940A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190055445A (ko) * 2017-11-15 2019-05-23 덴버코리아이엔씨 주식회사 고압분사용 선단 장치

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10236257A1 (de) 2002-08-09 2004-02-26 Stump Spezialtiefbau Gmbh Düsenstrahlvorrichtung
DE202007002177U1 (de) 2007-02-14 2008-06-26 Aschacher, Lothar Hochdruckinjektionsvorrichtung zur Einbringung von Suspensionen in zu verfestigende und/oder abzudichtende Böden
ITTO20080335A1 (it) 2008-05-06 2009-11-07 Trevi Spa Testa di iniezione per l'esecuzione di tecniche di jet grouting

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190055445A (ko) * 2017-11-15 2019-05-23 덴버코리아이엔씨 주식회사 고압분사용 선단 장치

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Publication number Publication date
CA2886940A1 (fr) 2015-10-17
EP2933380A1 (fr) 2015-10-21

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