EP0633361B1 - Apparatus and method of constructing monolithic trench walls, sills and hard standings - Google Patents

Apparatus and method of constructing monolithic trench walls, sills and hard standings Download PDF

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Publication number
EP0633361B1
EP0633361B1 EP94109778A EP94109778A EP0633361B1 EP 0633361 B1 EP0633361 B1 EP 0633361B1 EP 94109778 A EP94109778 A EP 94109778A EP 94109778 A EP94109778 A EP 94109778A EP 0633361 B1 EP0633361 B1 EP 0633361B1
Authority
EP
European Patent Office
Prior art keywords
soil
trench
container
mix
excavated
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.)
Expired - Lifetime
Application number
EP94109778A
Other languages
German (de)
English (en)
French (fr)
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EP0633361A1 (en
Inventor
Davide Trevisani
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.)
Trevi SpA
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Trevi SpA
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Filing date
Publication date
Application filed by Trevi SpA filed Critical Trevi SpA
Publication of EP0633361A1 publication Critical patent/EP0633361A1/en
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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
    • E02D19/06—Restraining of underground water
    • E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
    • E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00—Excavations; Bordering of excavations; Making embankments
    • E02D17/13—Foundation slots or slits; Implements for making these slots or slits

Definitions

  • the present invention refers to an apparatus and method of constructing monolithic trench walls, sills and hard standings.
  • the soil is mixed to a consolidating agent, preferably cement, with a possible addition of water and concrete additives.
  • a consolidating agent preferably cement
  • the soil has to be crumbled finely in order to have a homogeneous mix in which the aggregate granules remain covered with the consolidating mix. Big uncrushed sods in the finished work would compromise impermeability and cut down the final resistance of work, and therefore have to be carefully avoided.
  • Re-cycling of extracted soil has two purposes:
  • An apparatus for constructing piles with consolidated soil using excavated aggregate is known from Italian Patent applications No. 3592-A/89 and No. 3488-A/90 (EP-A-0 411 560) in the name of the same Applicant.
  • This apparatus comprises a disgregating and mixing tool mounted to the lower end of a rotating vertical rod. At first, the tool is positioned above the soil to be excavated, then it is forced into the ground. Air or water, if necessary, is simultaneously supplied to the tool. Upon reaching the required depth, a consolidating agent for binding the displaced soil is supplied into the ground through suitable bores located near the disgregating and mixing tool, as the latter is simultaneously raised. In this way, a pile of consolidated soil is formed.
  • the method of this invention is carried out by an apparatus consisting of two separate means: a crawler track excavating machine 10 and a blade mixer 11 pulled by a moving cement container 12.
  • a crawler track excavating machine 10 By moving side by side to the mixer 10 and the container 12, the excavating machine 10 constructs a continuous and monolithic trench wall 13.
  • the embodiments here shown exploit an excavating machine as disclosed in greater detail in Italian patent applications No. 3550-A/89 and No. 3551-A/89 (EP-A-0 407 934). Said machine, which is particularly suitable for excavating considerably deep trenches, could also be substituted by another kind of excavating machine, as far as is suitable for trench or channel excavation.
  • the excavating machine 10 comprises a cutter 14, also known as "trencher", slidably mounted to a beam 15.
  • Cutter 14 is provided with a chain 16 fitted with excavating tools or shovels 17.
  • Fitted downstream of the cutter 14 is a formwork 18 substantially U-shaped in horizontal cross-section (FIG. 1). As known, the two opposite parallel walls 19 of the formwork temporarily sustain the walls of the trench, whilst joining transverse wall 20 separates the excavating area of the cutter from the rear zone 13 where cement grout is cast, as will be more apparent hereinafter.
  • An end portion 21a of a conveyor belt 21 is secured to the bearing structure of cutter 14 corresponding to the point where the shovels 17 on chain 16 begin their descending phase.
  • the conveyor belt 21 projects over the mixing trailer 11 carrying a mixing tank 22 where suitable disgregating members or mixing blades 23 are provided.
  • the outlet end portion of a hose 24 having an inner screw feeder 25 is located proximate to the outlet 21b of conveyor belt 21, the other end being operatively connected to a conventional batching balance 26 mounted on the mixing trailer 11.
  • Cement that is stored in the silo is conveyed to balance 26 through a further loading screw 27 located between the container 12 and the mixing trailer 11.
  • Batching balance 26 consists of a cone-shaped vessel in which cement is let in and weighed. When a predetermined load is reached, cement is sent to a tank 22 by means of screw 25.
  • the bottom of tank 22 is downwardly inclined towards the rear end of the trailer 11, where an outlet port 29 communicates with a return channel 30 for casting mixed material into the trench 13.
  • a pump 31 for supplying water directly into the tank 22 through a conduit 32 is located on near balance 26 for further humidification of the mixture, if required.
  • a first pump 31 on one side of balance 26 supplies water directly into the balance cone before cement is cyclically introduced therein.
  • a first water and cement mixing takes place inside the balance.
  • a second pump (not shown) for supplying the water and cement mixture to the mixing tank 22 through a mixture supply conduit 28.
  • tank 22 receives cement grout already prepared by a closed vertical cylindrical mixer 34 containing a rotating disgregating and centrifuging blade member 35.
  • This solution that is particularly suitable for crumbling clayish soil, does not let out cement grout continuously as in the examples set forth, but prepares it cyclically.
  • Tank 22 serves to accumulate the ready mixture and deliver it continuously into the trench.
  • cement is conveyed dry by the screw feeder 25. Additional water may be supplied by the pump 31 and hose 32.
  • the excavating machine 10 follows a predetermined path and excavates a trench by means of the cutter 14. As it proceeds, the excavating machine 10 is constantly flanked by the mixing trailer 11 which is towed by the moving cement container 12. While ascending, the shovels 17 (FIG. 2) excavate the soil bringing coarse fragments out of the trench and laying same onto the conveyor belt 21. Then, the excavated soil is brought up to the top of the mixing tank 22 or 34, where it is finely crushed by the moving disgregating members 23 and mixed to the cement (in the embodiments of FIGS. 1 and 4) or to the water and cement mixture (in the embodiment of FIG. 3). In this latter case, the presence of water in the mixture is advantageous in providing additional disgregating action that renders operation of members 23 easier.
  • the mix of soil and consolidating mixture approaches the rear and lower end of the tank while it is progressively crumbled and rendered homogeneous by members 23. As it reaches the outlet opening 29, the mix possesses all features ideal for casting, so it is let out into the trench continuously through return channel 30.
  • the tank 22 allow an expert to control that the mix that is cast in the trench has the required plasticity. By controlling the amount of water of the cement grout that is let into the tank, the operator can always make sure that the mix possesses the best moisture ratio.
  • the operator may allow only cement inlet from the cement container.
  • the operator may provide for expelling water in excess through an overflow system comprising an outlet valve (not shown) fitted in the top part of tank 22. It should be appreciated that water in excess is eliminated in any case as the soil fragments are conveyed on belt 21, where part of the water falls down the belt without reaching the tank.
  • a variant form which is different from the embodiments set forth is applicable for sill and hard standing construction.
  • this modified form which is not illustrated as it involves minimum differences with respect to the apparatus of the above embodiments, comprises a cutter or excavating implement having a different shape, adapted for excavating channels larger and shallower than those for trenches.
  • the cutter may be substituted by a bucket or shovel system for digging the soil and transferring it onto the belt to be mixed with cement and let back into the previously excavated channel.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
  • Bulkheads Adapted To Foundation Construction (AREA)
  • Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
  • Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
EP94109778A 1993-06-30 1994-06-24 Apparatus and method of constructing monolithic trench walls, sills and hard standings Expired - Lifetime EP0633361B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO930477A IT1261066B (it) 1993-06-30 1993-06-30 Procedimento per la realizzazione di diaframmi, basamenti e piazzali monolitici e relativa attrezzatura.
ITTO930477 1993-06-30

Publications (2)

Publication Number Publication Date
EP0633361A1 EP0633361A1 (en) 1995-01-11
EP0633361B1 true EP0633361B1 (en) 1997-11-26

Family

ID=11411593

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94109778A Expired - Lifetime EP0633361B1 (en) 1993-06-30 1994-06-24 Apparatus and method of constructing monolithic trench walls, sills and hard standings

Country Status (5)

Country Link
EP (1) EP0633361B1 (es)
JP (1) JPH07138941A (es)
DE (1) DE69406988T2 (es)
ES (1) ES2111801T3 (es)
IT (1) IT1261066B (es)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19530827C2 (de) * 1995-08-22 1999-04-01 Bauer Spezialtiefbau Verfahren und Vorrichtung zur Herstellung von Schlitzwänden
NL1007263C2 (nl) * 1997-10-13 1999-04-14 Bouwkundig Adviesburo Roel Meu Graafinrichting.
ITTO980582A1 (it) * 1998-07-03 2000-01-03 Soilmec Spa Attrezzatura di scavo
US7455479B2 (en) 2005-07-14 2008-11-25 Joseph Kauschinger Methods and systems for monitoring pressure during jet grouting

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3127350C2 (de) * 1981-07-10 1985-01-03 Hans 8202 Bad Aibling Ribbert Verfahren zur Bodenverfestigung
FR2558862B1 (fr) * 1984-01-26 1987-02-13 Vidal Pierre Procede de traitement de sol par mise en oeuvre d'un mortier obtenu par broyage et/ou desintegration des materiaux extraits, avec adjonction d'eau et d'un liant
ES2045667T3 (es) * 1989-07-10 1994-01-16 Trevi Spa Metodo para ejecutar muros estructurales monoliticos rectos o circulares y una maquina para realizar dicho metodo.

Also Published As

Publication number Publication date
DE69406988T2 (de) 1998-06-10
DE69406988D1 (de) 1998-01-08
EP0633361A1 (en) 1995-01-11
ITTO930477A1 (it) 1994-12-30
IT1261066B (it) 1996-05-08
ES2111801T3 (es) 1998-03-16
ITTO930477A0 (it) 1993-06-30
JPH07138941A (ja) 1995-05-30

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