US20090022584A1 - Pump for hydromill - Google Patents

Pump for hydromill Download PDF

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Publication number
US20090022584A1
US20090022584A1 US12/061,456 US6145608A US2009022584A1 US 20090022584 A1 US20090022584 A1 US 20090022584A1 US 6145608 A US6145608 A US 6145608A US 2009022584 A1 US2009022584 A1 US 2009022584A1
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United States
Prior art keywords
pump
drums
respect
axes
bits
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.)
Abandoned
Application number
US12/061,456
Inventor
Gianluca Braghittoni
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Soilmec SpA
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Soilmec SpA
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Publication date
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Assigned to SOILMEC S.P.A. reassignment SOILMEC S.P.A. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BRAGHITTONI, GIANLUCA
Publication of US20090022584A1 publication Critical patent/US20090022584A1/en
Abandoned legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/18—Dredgers; Soil-shifting machines mechanically-driven with digging wheels turning round an axis, e.g. bucket-type wheels
    • E02F3/20—Dredgers; Soil-shifting machines mechanically-driven with digging wheels turning round an axis, e.g. bucket-type wheels with tools that only loosen the material, i.e. mill-type wheels
    • E02F3/205—Dredgers; Soil-shifting machines mechanically-driven with digging wheels turning round an axis, e.g. bucket-type wheels with tools that only loosen the material, i.e. mill-type wheels with a pair of digging wheels, e.g. slotting machines
    • 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
    • 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

Definitions

  • the present invention relates to a pump for a hydromill.
  • hydromills digging equipment for constructing diaphragms, commonly referred to as hydromills, which is mainly constituted by a frame suspended from ropes, and milling drums with parallel horizontal axes set underneath the frame.
  • the drums turn, removing the soil and producing an excavation having a rectangular section in which the frame is let down vertically by means of ropes.
  • the walls of the excavation are withheld by the hydrostatic pressure of an appropriate drilling mud.
  • the debris is sucked in together with said mud by a pump, which is usually of a centrifugal type, and conveyed out of the excavation by a flexible pipe.
  • the dimensions of the frame are limited by the dimensions of the excavation and condition the possibilities of installation of the pump.
  • the pump basically has the shape of a disk with a diameter greater than the thickness of the frame and a more modest height.
  • the motor for turning the impeller.
  • the motor is of the hydraulic type with “inclined body”.
  • Another problem consists in the poor accessibility of the pump for maintenance purposes or for complete replacement.
  • the present invention aims at providing an improved solution to the above problems by proposing a pump for digging equipment for the construction of diaphragms, in which the equipment envisages, in its end part, drums provided with bits, mounted so that they rotate on their own axes.
  • the drums are carried by a top frame, inside which, in the proximity of the drums, a centrifugal pump is mounted, said pump being characterized in that it is positioned in such a way that its axis comes to lie in a substantially horizontal plane, parallel to the plane passing through the axes of the bits and is oriented with an angle of between 30° and 60° with respect to the sides of the rectangular section of the excavation, whilst the maximum diameter of the pump and its motor fall within the thickness of the frame.
  • FIG. 1 is a front view of the bottom part of digging equipment for the construction of diaphragms provided with the pump according to the present invention
  • FIG. 2 is an enlarged view of the equipment of FIG. 1 in an area corresponding to the pump;
  • FIG. 3 is the view according to the section A-A of FIG. 2 of the pump.
  • the end part of the equipment envisages two drums 10 and 11 provided with bits 12 , mounted so that they rotate on their own axes A to perform the steps of excavation in the earth that are well known to a person skilled in the branch.
  • the drums 10 and 11 are carried by a top frame 13 , which is also of a known type.
  • centrifugal pump 14 Mounted within the frame, in the proximity of the drum, is a centrifugal pump 14 , once again of a known type, which, according to the invention, is positioned in such a way that its axis 15 comes to lie in a horizontal plane, parallel to the plane passing through the axes A of the bits 12 . In this way, the projection in plan view is the absolutely minimum one and leaves the maximum section of surrounding passage free.
  • the axis of the pump 10 is oriented with a marked angle, of between 30° and 60° and, preferably, about 45°, with respect to the sides of the rectangular section of excavation, whereas the maximum diameter of the pump and the corresponding motor drive fall within the thickness of the frame 13 .
  • the motor of the pump is aligned with the impeller of the pump, whilst, in the embodiment represented in FIGS. 2 and 3 , the motor 21 of the pump is set out of line with respect to the impeller by means, by way of non-limiting example, of some gears with parallel axes contained in a purposely provided casing 22 .
  • the axis of the pump lies in a plane slightly inclined with respect to the horizontal, preferably by 10°. In this way, the suction pipe can present a more rectilinear development within the allowed encumbrance.
  • the delivery pipe 16 of the pump is directed upwards, whilst the suction pipe 17 can have a section larger than that of the delivery pipe 16 .
  • the suction pipe is made up of various pipe elements 18 , 19 , 20 , possibly with a non-circular cross section, to enable ease of maintenance.
  • the delivery mouth of the pump faces upwards and since the delivery pipe 16 rises in a substantially vertical way, as may be noted in the figures, the first significant curve falls outside of the excavation, and a possible perforation due to wear is immediately visible. In other solutions, the perforation occurs in the submerged equipment so that it is difficult to identify it immediately.
  • the bends in the suction stretch which present a larger number as compared to known solutions, are less critical because said stretch is short and can hence be conveniently made with a larger cross section, consequently reducing the rate of the fluid and debris contained therein.
  • the vertical pipe instead, may be even some hundred metres long and is made of rubber reinforced with wire cloth, hence very sturdy and costly; in fact, an increase in diameter would entail considerable increase in cost.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Paleontology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Hydrology & Water Resources (AREA)
  • Mechanical Engineering (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Saccharide Compounds (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)

Abstract

A pump for digging equipment is for the construction of diaphragms The equipment envisages in its end part drums (10 and 11), provided with bits (12) mounted so that they rotate on their own axes (A) The drums are carried by a top frame (13), mounted within which, in the proximity of the drums, is a centrifugal pump (14). The pump (14) is positioned in such a way that its axis (15) comes to lie in a substantially horizontal plane, parallel to the plane passing through the axes (A) of the bits (12) and is oriented at an angle of between 30° and 60° with respect to the sides of the rectangular section of the excavation, whilst the maximum diameter of the pump and its motor fall within the thickness of the frame (13).

Description

  • The present invention relates to a pump for a hydromill.
  • Known to the art is digging equipment for constructing diaphragms, commonly referred to as hydromills, which is mainly constituted by a frame suspended from ropes, and milling drums with parallel horizontal axes set underneath the frame.
  • The drums turn, removing the soil and producing an excavation having a rectangular section in which the frame is let down vertically by means of ropes.
  • The walls of the excavation are withheld by the hydrostatic pressure of an appropriate drilling mud.
  • The debris is sucked in together with said mud by a pump, which is usually of a centrifugal type, and conveyed out of the excavation by a flexible pipe.
  • The dimensions of the frame are limited by the dimensions of the excavation and condition the possibilities of installation of the pump.
  • The pump basically has the shape of a disk with a diameter greater than the thickness of the frame and a more modest height.
  • Set on one of the faces of the disk is the motor for turning the impeller. Usually, the motor is of the hydraulic type with “inclined body”.
  • A possibility of placing is described in the patent No. EP-0 249 555. In this solution, however, the projection in plan view of the overall encumbrance of the pump constitutes a non-negligible obstacle to the flow of the mud into the excavation and to the passage of the hydraulic pipes for supply of the motors of the drums, of control members, and of other mechanical items.
  • Another problem linked to the position of the pump is the abrasive effect that the debris has on the bends of the delivery pipe. If said vertical pipe has a rectilinear development, its service life increases.
  • Another problem consists in the poor accessibility of the pump for maintenance purposes or for complete replacement.
  • The present invention aims at providing an improved solution to the above problems by proposing a pump for digging equipment for the construction of diaphragms, in which the equipment envisages, in its end part, drums provided with bits, mounted so that they rotate on their own axes. The drums are carried by a top frame, inside which, in the proximity of the drums, a centrifugal pump is mounted, said pump being characterized in that it is positioned in such a way that its axis comes to lie in a substantially horizontal plane, parallel to the plane passing through the axes of the bits and is oriented with an angle of between 30° and 60° with respect to the sides of the rectangular section of the excavation, whilst the maximum diameter of the pump and its motor fall within the thickness of the frame.
  • The pump according to the invention will now be described with reference to the annexed plates of drawings, in which:
  • FIG. 1 is a front view of the bottom part of digging equipment for the construction of diaphragms provided with the pump according to the present invention;
  • FIG. 2 is an enlarged view of the equipment of FIG. 1 in an area corresponding to the pump; and
  • FIG. 3 is the view according to the section A-A of FIG. 2 of the pump.
    •
  • As may be noted in FIG. 1, the end part of the equipment envisages two drums 10 and 11 provided with bits 12, mounted so that they rotate on their own axes A to perform the steps of excavation in the earth that are well known to a person skilled in the branch.
  • The drums 10 and 11 are carried by a top frame 13, which is also of a known type.
  • Mounted within the frame, in the proximity of the drum, is a centrifugal pump 14, once again of a known type, which, according to the invention, is positioned in such a way that its axis 15 comes to lie in a horizontal plane, parallel to the plane passing through the axes A of the bits 12. In this way, the projection in plan view is the absolutely minimum one and leaves the maximum section of surrounding passage free.
  • In addition, the axis of the pump 10 is oriented with a marked angle, of between 30° and 60° and, preferably, about 45°, with respect to the sides of the rectangular section of excavation, whereas the maximum diameter of the pump and the corresponding motor drive fall within the thickness of the frame 13.
  • Normally, the motor of the pump is aligned with the impeller of the pump, whilst, in the embodiment represented in FIGS. 2 and 3, the motor 21 of the pump is set out of line with respect to the impeller by means, by way of non-limiting example, of some gears with parallel axes contained in a purposely provided casing 22.
  • In a further variant, the axis of the pump lies in a plane slightly inclined with respect to the horizontal, preferably by 10°. In this way, the suction pipe can present a more rectilinear development within the allowed encumbrance.
  • The delivery pipe 16 of the pump is directed upwards, whilst the suction pipe 17 can have a section larger than that of the delivery pipe 16. In addition, the suction pipe is made up of various pipe elements 18, 19, 20, possibly with a non-circular cross section, to enable ease of maintenance.
  • Since the delivery mouth of the pump faces upwards and since the delivery pipe 16 rises in a substantially vertical way, as may be noted in the figures, the first significant curve falls outside of the excavation, and a possible perforation due to wear is immediately visible. In other solutions, the perforation occurs in the submerged equipment so that it is difficult to identify it immediately.
  • With the solution proposed by the present invention, the bends in the suction stretch, which present a larger number as compared to known solutions, are less critical because said stretch is short and can hence be conveniently made with a larger cross section, consequently reducing the rate of the fluid and debris contained therein.
  • The vertical pipe, instead, may be even some hundred metres long and is made of rubber reinforced with wire cloth, hence very sturdy and costly; in fact, an increase in diameter would entail considerable increase in cost.
  • Finally, with a placement of the pump of the type described above, accessibility for carrying out maintenance operations is very good, both as regards the pump itself and as regards the suction pipe, which can be made up of various flanged elements.

Claims (7)

1. A pump for digging equipment for the construction of diaphragms, wherein the equipment includes drums in an end part, provided with bits mounted so that the bits rotate on their own axes; and wherein the drums are carried by a top frame the pump comprising a centrifugal pump mounted within the top frame proximate the drums, wherein the pump is positioned so that its axis comes to lie in a substantially horizontal plane, parallel to the plane passing through axes of the bits and is oriented at an angle of between 30° and 60° with respect to sides of a rectangular section of an excavation, wherein the maximum diameter of the pump and its motor fall within the thickness of the frame.
2. The pump according to claim 1, wherein the axis of the pump is oriented at an angle of approximately 45° with respect to the sides of the rectangular section of the excavation.
3. The pump according to claim 2, wherein the axis of the pump lies in a plane inclined by 10° with respect to the horizontal.
4. The pump according to claim 1, wherein a motor of the pump is set out of line with respect to an impeller by gears with parallel axes contained in a purposely provided casing.
5. The pump according to claim 1, wherein a delivery pipe of the pump is directed upwards, and wherein a suction pipe has a cross section larger than that of the delivery pipe.
6. The pump according to claim 5, wherein the suction pipe comprises a plurality of pipe elements.
7. The pump according to claim 5, wherein the suction pipe has a non-circular cross section.
US12/061,456 2007-04-05 2008-04-02 Pump for hydromill Abandoned US20090022584A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO2007A000241 2007-04-05
IT000241A ITTO20070241A1 (en) 2007-04-05 2007-04-05 PUMP FOR HYDROFRESA.

Publications (1)

Publication Number Publication Date
US20090022584A1 true US20090022584A1 (en) 2009-01-22

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US12/061,456 Abandoned US20090022584A1 (en) 2007-04-05 2008-04-02 Pump for hydromill

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US (1) US20090022584A1 (en)
EP (1) EP1978160A1 (en)
JP (1) JP2008255776A (en)
IT (1) ITTO20070241A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120115408A1 (en) * 2003-03-06 2012-05-10 Steen Hagensen Fan Assemblies, Mechanical Draft systems and Methods
US20140105303A1 (en) * 2012-10-11 2014-04-17 Himanshu Kaul Motion Estimation for Video Processing
US11041282B2 (en) * 2017-10-06 2021-06-22 Soilmec S.P.A. Excavation tool for making diaphragms and related excavation equipment
US11286637B2 (en) * 2018-04-18 2022-03-29 Bauer Maschinen Gmbh Trench cutter and method for producing a cut trench in the soil

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL2005081C2 (en) * 2010-07-14 2012-01-17 Damen Dredging Equipment B V CUTTING HEAD.

Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2991568A (en) * 1959-11-19 1961-07-11 Smith Harold Kellogg Digger wheel, pump and motor unit for dredges
US3614837A (en) * 1968-06-13 1971-10-26 Toshinobu Araoka Apparatus for dredging and sifting mud sands or gravel
US3710878A (en) * 1969-12-13 1973-01-16 Takenaka Komuten Co Chain cutter type excavator and ditch excavating method
US3773121A (en) * 1970-11-20 1973-11-20 Tone Boring Co Reaction minimized earth boring
US3885330A (en) * 1973-03-07 1975-05-27 Toshinobu Araoka Excavator for digging a hole beneath the water
US4305214A (en) * 1979-08-10 1981-12-15 Hurst George P In-line centrifugal pump
US4694915A (en) * 1984-07-06 1987-09-22 Karl Bauer Spezialtiefbau Gmbh & Co Kg Slotted wall milling cutter
US4742876A (en) * 1985-10-09 1988-05-10 Soletanche Submarine drilling device
US4744425A (en) * 1986-01-28 1988-05-17 Hochtief Aktiengesellschaft Vorm. Gebr. Helfmann Apparatus for excavating a substantially vertical slot
US5148615A (en) * 1991-06-04 1992-09-22 Vmi Inc. Dredging apparatus
US6839988B2 (en) * 2000-03-13 2005-01-11 Compagnie Du Sol Drilling apparatus for hard ground
US6839989B2 (en) * 2000-03-13 2005-01-11 Compagnie Du Sol Drilling apparatus for hard ground
US6860042B2 (en) * 2002-07-19 2005-03-01 Walker-Dawson Interests, Inc. Excavation system employing a jet pump
US7114271B2 (en) * 2003-06-11 2006-10-03 Compagnie Du Sol Cutting tool for digging trenches, and enabling the cutter head to be changed quickly
US7591514B2 (en) * 2006-07-28 2009-09-22 Compagnie Du Sol Cutter head for an excavator machine

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4095545A (en) * 1977-03-02 1978-06-20 Vmi, Inc. Self-propelled dredging apparatus
FR2600119B1 (en) 1986-06-11 1988-08-26 Soletanche MOTOR PUMP FOR MILLING MACHINE FOR Digging Trenches In The Ground
JP2822872B2 (en) * 1994-02-04 1998-11-11 株式会社大林組 Rotary excavator

Patent Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2991568A (en) * 1959-11-19 1961-07-11 Smith Harold Kellogg Digger wheel, pump and motor unit for dredges
US3614837A (en) * 1968-06-13 1971-10-26 Toshinobu Araoka Apparatus for dredging and sifting mud sands or gravel
US3710878A (en) * 1969-12-13 1973-01-16 Takenaka Komuten Co Chain cutter type excavator and ditch excavating method
US3773121A (en) * 1970-11-20 1973-11-20 Tone Boring Co Reaction minimized earth boring
US3885330A (en) * 1973-03-07 1975-05-27 Toshinobu Araoka Excavator for digging a hole beneath the water
US4305214A (en) * 1979-08-10 1981-12-15 Hurst George P In-line centrifugal pump
US4694915A (en) * 1984-07-06 1987-09-22 Karl Bauer Spezialtiefbau Gmbh & Co Kg Slotted wall milling cutter
US4742876A (en) * 1985-10-09 1988-05-10 Soletanche Submarine drilling device
US4744425A (en) * 1986-01-28 1988-05-17 Hochtief Aktiengesellschaft Vorm. Gebr. Helfmann Apparatus for excavating a substantially vertical slot
US5148615A (en) * 1991-06-04 1992-09-22 Vmi Inc. Dredging apparatus
US6839988B2 (en) * 2000-03-13 2005-01-11 Compagnie Du Sol Drilling apparatus for hard ground
US6839989B2 (en) * 2000-03-13 2005-01-11 Compagnie Du Sol Drilling apparatus for hard ground
US6860042B2 (en) * 2002-07-19 2005-03-01 Walker-Dawson Interests, Inc. Excavation system employing a jet pump
US7114271B2 (en) * 2003-06-11 2006-10-03 Compagnie Du Sol Cutting tool for digging trenches, and enabling the cutter head to be changed quickly
US7591514B2 (en) * 2006-07-28 2009-09-22 Compagnie Du Sol Cutter head for an excavator machine

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120115408A1 (en) * 2003-03-06 2012-05-10 Steen Hagensen Fan Assemblies, Mechanical Draft systems and Methods
US20140105303A1 (en) * 2012-10-11 2014-04-17 Himanshu Kaul Motion Estimation for Video Processing
US11041282B2 (en) * 2017-10-06 2021-06-22 Soilmec S.P.A. Excavation tool for making diaphragms and related excavation equipment
US11286637B2 (en) * 2018-04-18 2022-03-29 Bauer Maschinen Gmbh Trench cutter and method for producing a cut trench in the soil

Also Published As

Publication number Publication date
JP2008255776A (en) 2008-10-23
EP1978160A1 (en) 2008-10-08
ITTO20070241A1 (en) 2008-10-06

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AS Assignment

Owner name: SOILMEC S.P.A., ITALY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:BRAGHITTONI, GIANLUCA;REEL/FRAME:020761/0526

Effective date: 20080326

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION