EP0039474A1 - Immersion vibrator - Google Patents

Immersion vibrator Download PDF

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Publication number
EP0039474A1
EP0039474A1 EP81103212A EP81103212A EP0039474A1 EP 0039474 A1 EP0039474 A1 EP 0039474A1 EP 81103212 A EP81103212 A EP 81103212A EP 81103212 A EP81103212 A EP 81103212A EP 0039474 A1 EP0039474 A1 EP 0039474A1
Authority
EP
European Patent Office
Prior art keywords
load
pump
sensing
actuator
pressure
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.)
Granted
Application number
EP81103212A
Other languages
German (de)
French (fr)
Other versions
EP0039474B1 (en
Inventor
Franz Eichkorn
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.)
Fritz Pollems Spezialtiefbau KG
Original Assignee
FRITZ POLLEMS SPETIALTIEFBAU KG
Fritz Pollems Spezialtiefbau KG
POLLEMS FRITZ KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6101442&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0039474(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by FRITZ POLLEMS SPETIALTIEFBAU KG, Fritz Pollems Spezialtiefbau KG, POLLEMS FRITZ KG filed Critical FRITZ POLLEMS SPETIALTIEFBAU KG
Priority to AT81103212T priority Critical patent/ATE4233T1/en
Publication of EP0039474A1 publication Critical patent/EP0039474A1/en
Application granted granted Critical
Publication of EP0039474B1 publication Critical patent/EP0039474B1/en
Expired legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22—Piles
    • E02D5/24—Prefabricated piles
    • E02D5/32—Prefabricated piles with arrangements for setting or assisting in setting in position by fluid jets
    • 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
    • E02D3/02—Improving by compacting
    • E02D3/046—Improving by compacting by tamping or vibrating, e.g. with auxiliary watering of the soil
    • E02D3/054—Improving by compacting by tamping or vibrating, e.g. with auxiliary watering of the soil involving penetration of the soil, e.g. vibroflotation
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
    • E02D7/26—Placing by using several means simultaneously

Definitions

  • This invention relates to hydraulic systems and particularly such systems utilizing hydraulic actuators connected in parallel to move a single load.
  • an objective of the present invention is to provide a system wherein the pressures are equalized when two actuators are supplied from a pump. It is a further objective to provide such a system for use in a system shown in German 0ffenlegungsschrift 30 11 088 having a common assignee with the present application, wherein pilot operated meter-in valves are used .to control flow to the cylinders. In such a system, the characteristics of the meter-in are not matched perfectly. Further, if the meter-in valves are pressure compensated, there is a tendency for one cylinder to carry all of the load, and the other to have a high differential pressure drop across the meter-in valve.
  • the load on each actuator cylinder is sensed and the average is applied to the load responsive means for varying the displacement of a variable displacement pump.
  • Fig. 1 is a schematic drawing of a hydraulic circuit embodying the invention, only one fluid inlet for each actuator being shown, however, two passages, one for each end, being feaseable. Furthermore, the control passages for the meter-in valves have been omitted.
  • the hydraulic system embodying the invention comprises a pair of hydraulic actuators 10 in the form of cylinders having their piston rods 11 connected in parallel to a single load L . Fluid is supplied to one end of cylinders 10 by a pump 12 through lines 13. A pilot operated meter-in valve 14 in each line 13 controls the flow to its respective cylinder 10. A load drop check valve 15 is interposed in each line 13.
  • This circuit is similar to that disclosed in the aforementioned patent application, the disclosure of which is incorporated herein by reference.
  • the pump 12 is of the variable displacement type including load responsive means 16 for varying the displacement of the pump.
  • the mode of control is referred to as load sensing, and functions so that the pump provides sufficient flow to maintain the pressure in line 13 higher than the pressure in line 18 by a slight amount referred to as load sensing compensator differential pressure.
  • a load sensing line 17 senses the pressure between each meter-in valve 14 and the associated load drop check valve 15.
  • the lines 17 are connected to a load control line 18 extending through shuttle 21 to the load responsive means 16 on the pump l2.
  • load sensing shuttles 19 are provided between the sensing lines so that the highest pressure is controlling.
  • An orifice 20 is provided in each line 17, the orifices being equal in size.
  • the above described system tends to equalize the lifting pressures in each of two mechanically parallel connected cylinders.
  • the orifices 20 function essentially to create a load sensing control pressure which is the average of the pressures between the two cylinders.
  • the pump will be incapable of developing sufficient pressure to lift a load with only one cylinder pressurized.
  • the pressure commanded of the pump is limited to twice the pump load sensing compensator differential pressure. If the pressure required to lift the load is more than twice the load sensing differential, the load will not be raised until the second meter-in element opens. When a load is being raised, the pump will onstroke only as long as the cylinder pressures match each other within twice the load sensing compensator differential pressure.
  • the load sensing flow will pass from the high pressure cylinder to the low pressure cylinder. Since the orifices are equal, the pressure drop across each will be equal, and the load sensing signal will be limited to the sum of pressure in the low pressure cylinder and one-half the difference between the cylinder pressures. The flow passing through the orifices will be fed to the low pressure cylinder through the load drop check. Sizing of the orifices is not critical, except that they must be equal.
  • the pump output pressure will be a given amount above the load sensing feedback pressure, the pump pressure will not exceed the higher cylinder pressure when one cylinder is twice the normal load sensing differential pressure above the lower cylinder pressure.
  • the additional acutator When considering a case where pump output pressure is determined by a load sensing signal L S2 from another function such as an additional actuator, not shown, the additional acutator is connected to the system through a load sensing shuttle 21.
  • L S2 When L S2 is higher than L S1, the pump output pressure may be considerably higher than that required to raise a load. If one meter-in opens in advance of another because of a mismatch, there will be flow from the high pressure side through line 17.
  • Line 17 can be sized so as to accommodate sufficient flow so that the pressure difference between the two cylinders will be within an acceptable value. The addition of line 17 does not sacrifice the load holding capability of the valve in case of line rupture, because line 17 is isolated by the load drop check valves 15.

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Agronomy & Crop Science (AREA)
  • Soil Sciences (AREA)
  • Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
  • Glass Compositions (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
  • Ultra Sonic Daignosis Equipment (AREA)
  • Surgical Instruments (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Soil Working Implements (AREA)
  • Excavating Of Shafts Or Tunnels (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
  • Special Spraying Apparatus (AREA)

Abstract

A deep vibrator includes a propulsion head (1) vibrating in a transverse direction with respect to the longitudinal axis of a suspension tube propulsion head being secured to the lower end of a suspension tube (2) while the outer wall of the suspension tube (2) includes pipes (4) arranged in the longitudinal direction thereof having at the lower end of the propulsion head (1) a spraying nozzle through which water may be fed under pressure, further spraying nozzles being distributed along the length of the pipes (4,5) and so aligned that they spray water into the annular space surrounding the suspension tube (2) thereby washing ground material toward the propulsion head.

Description

  • This invention relates to hydraulic systems and particularly such systems utilizing hydraulic actuators connected in parallel to move a single load.
    • BACKGROUND AND SUMMARY OF THE INVENTION
  • In hydraulic systems for moving loads such as an excavator boom it is common to utilize two actuators such as cylinders to move a single load. In such systems where there are individual valves controlling each cylinder, there is a tendency for one cylinder to provide the entire lifting force because of the difficulty in controlling the flow to each actuator.
  • Accordingly, an objective of the present invention is to provide a system wherein the pressures are equalized when two actuators are supplied from a pump. It is a further objective to provide such a system for use in a system shown in German 0ffenlegungsschrift 30 11 088 having a common assignee with the present application, wherein pilot operated meter-in valves are used .to control flow to the cylinders. In such a system, the characteristics of the meter-in are not matched perfectly. Further, if the meter-in valves are pressure compensated, there is a tendency for one cylinder to carry all of the load, and the other to have a high differential pressure drop across the meter-in valve.
  • In accordance with the invention the load on each actuator cylinder is sensed and the average is applied to the load responsive means for varying the displacement of a variable displacement pump.
    • DESCRIPTION OF THE DRAWINGS
  • Fig. 1 is a schematic drawing of a hydraulic circuit embodying the invention, only one fluid inlet for each actuator being shown, however, two passages, one for each end, being feaseable. Furthermore, the control passages for the meter-in valves have been omitted.
    • DESCRIPTION
  • Referring to Fig. 1, the hydraulic system embodying the invention comprises a pair of hydraulic actuators 10 in the form of cylinders having their piston rods 11 connected in parallel to a single load L. Fluid is supplied to one end of cylinders 10 by a pump 12 through lines 13. A pilot operated meter-in valve 14 in each line 13 controls the flow to its respective cylinder 10. A load drop check valve 15 is interposed in each line 13. This circuit is similar to that disclosed in the aforementioned patent application, the disclosure of which is incorporated herein by reference.
  • The pump 12 is of the variable displacement type including load responsive means 16 for varying the displacement of the pump. The mode of control is referred to as load sensing, and functions so that the pump provides sufficient flow to maintain the pressure in line 13 higher than the pressure in line 18 by a slight amount referred to as load sensing compensator differential pressure.
  • In accordance with the invention, a load sensing line 17 senses the pressure between each meter-in valve 14 and the associated load drop check valve 15. The lines 17 are connected to a load control line 18 extending through shuttle 21 to the load responsive means 16 on the pump l2. When additional meter-in valves, not shown, are connected to the system for supplying fluid to the rod end of the actuators, load sensing shuttles 19 are provided between the sensing lines so that the highest pressure is controlling.
  • An orifice 20 is provided in each line 17, the orifices being equal in size.
    • SUMMARY OF OPERATION
  • The above described system tends to equalize the lifting pressures in each of two mechanically parallel connected cylinders. Consider first the case where the pressure required to raise the load L is higher than that required for any other function supplied by pump 12. The orifices 20 function essentially to create a load sensing control pressure which is the average of the pressures between the two cylinders. The pump will be incapable of developing sufficient pressure to lift a load with only one cylinder pressurized. Thus, in the case where one meter-in valve opens in advance of another, the pressure commanded of the pump is limited to twice the pump load sensing compensator differential pressure. If the pressure required to lift the load is more than twice the load sensing differential, the load will not be raised until the second meter-in element opens. When a load is being raised, the pump will onstroke only as long as the cylinder pressures match each other within twice the load sensing compensator differential pressure.
  • If one cylinder is at high pressure, and the other is low, the load sensing flow will pass from the high pressure cylinder to the low pressure cylinder. Since the orifices are equal, the pressure drop across each will be equal, and the load sensing signal will be limited to the sum of pressure in the low pressure cylinder and one-half the difference between the cylinder pressures. The flow passing through the orifices will be fed to the low pressure cylinder through the load drop check. Sizing of the orifices is not critical, except that they must be equal.
  • Since the pump output pressure will be a given amount above the load sensing feedback pressure, the pump pressure will not exceed the higher cylinder pressure when one cylinder is twice the normal load sensing differential pressure above the lower cylinder pressure.
  • When considering a case where pump output pressure is determined by a load sensing signal LS2 from another function such as an additional actuator, not shown, the additional acutator is connected to the system through a load sensing shuttle 21. When LS2 is higher than LS1, the pump output pressure may be considerably higher than that required to raise a load. If one meter-in opens in advance of another because of a mismatch, there will be flow from the high pressure side through line 17. Line 17 can be sized so as to accommodate sufficient flow so that the pressure difference between the two cylinders will be within an acceptable value. The addition of line 17 does not sacrifice the load holding capability of the valve in case of line rupture, because line 17 is isolated by the load drop check valves 15.

Claims (4)

1. A hydraulic system comprising
a pair of actuators (10) operable to move a single load (L) each said actuator (10) having a fluid inlet,
a variable displacement pump (12) including means (16) responsive to a pressure for varying the displacement of the pump,
a pilot operated meter-in valve (14) associated with each actuator (10) for supplying fluid from the pump (12) to its respective actuator (10), characterized in that
sensing means (17, 18) for sensing the pressures between each meter-in valve (14) and its associated actuator (10) is provided for applying an average of said pressures to said responsive means (16) of said pump (12).
2. The hydraulic system set forth in claim 1 characterized in that said sensing means (17, 18) includes a load drop check valve (15) between each meter-in valve (14) and its associated actuator (10), a load sensing line (17) extending to sense the pressure between each said meter-in valve (14) and its associated load drop check valve (15), said lines (17) connected to one another, an orifice (20) in each said load sensing line (17), said orifices (20) being equal in size, and a load control signal line (18) extending from said load sensing lines (17) between said orifices (20) to said responsive means (16) of said pump.
3. The hydraulic system set forth in any of claims 1 or 2 characterized in that each said actuator (10) is of the linear type.
4. The hydraulic system set forth in any of claims 1 through 3, characterized in that a load sensing shuttle (19) is provided between respective sensing lines (17), each being connected to a respective end of an actuator (10).
5. The hydraulic system set forth in any of claims 1 through 4, characterized in that said sensing means (17, 18) include an overrule shuttle (21) within the line (18) to said responsive means (16) of said pump (12), said overrule shuttle (21) being connected to a further load sensing lino (LS2).
EP81103212A 1980-05-02 1981-04-29 Immersion vibrator Expired EP0039474B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81103212T ATE4233T1 (en) 1980-05-02 1981-04-29 DEEP VIBRATOR.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3016841A DE3016841C2 (en) 1980-05-02 1980-05-02 Depth vibrator
DE3016841 1980-05-02

Publications (2)

Publication Number Publication Date
EP0039474A1 true EP0039474A1 (en) 1981-11-11
EP0039474B1 EP0039474B1 (en) 1983-07-20

Family

ID=6101442

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81103212A Expired EP0039474B1 (en) 1980-05-02 1981-04-29 Immersion vibrator

Country Status (6)

Country Link
US (1) US4415046A (en)
EP (1) EP0039474B1 (en)
AT (1) ATE4233T1 (en)
AU (1) AU6990981A (en)
DE (2) DE3016841C2 (en)
ZA (1) ZA812475B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19628769A1 (en) * 1996-07-17 1996-12-12 Bul Sachsen Gmbh Compacting ground, foundations and hardcore by means of vibrator

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4228542C1 (en) * 1992-08-27 1994-05-11 Keller Grundbau Gmbh Method and device for compacting landfills using deep vibrations
DE4234112C1 (en) * 1992-10-09 1993-10-14 Keller Grundbau Gmbh Process for obtaining landfill space by compacting rubbish bins
DE4303518C2 (en) * 1993-02-06 1995-02-16 Leffer Stahl & App Method and device for solidifying a landfill of pre-compacted waste with the development of additional capacity for fresh waste
DE19845132A1 (en) * 1998-10-01 2000-04-06 Hossein Hosseini Tudeshki Compacting method for e.g. unconsolidated rocks uses one or more rotating spirals, with shape, length, pitch, direction, speed, all dependent upon edge conditions
WO2001061115A1 (en) 2000-02-19 2001-08-23 Hossein Hosseini Tudeshki Method and device for compacting cohesive and non-cohesive material by means of pulsed displacement
FR2835857B1 (en) * 2002-02-08 2004-09-17 Carmine Trani METHOD AND DEVICE FOR COMPACTING SOILS
CN102733389B (en) * 2012-06-21 2014-10-15 上海中技桩业股份有限公司 High-pressure spray pile vibrosinking device and process

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL18467C (en) * 1900-01-01
FR455730A (en) * 1913-03-20 1913-08-07 Elmer Forrest Estes Device for driving piles or piles
US1574439A (en) * 1922-04-05 1926-02-23 Pringle Wayne Pile construction
US1905643A (en) * 1931-10-14 1933-04-25 Al Johnson Construction Co Apparatus for sinking bodies such as caissons and piles
DE685123C (en) * 1936-07-17 1939-12-12 Johann Keller Fa Process for compacting natural ground or bulges of great thickness with rocking
US2354936A (en) * 1941-12-15 1944-08-01 Emma C Bignell Apparatus for sinking piles
GB753132A (en) * 1952-06-25 1956-07-18 Sergey Steuerman Vibrator devices

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1277369A (en) * 1960-10-17 1961-12-01 S T V Vibratechniques Apparatus for making boreholes in poor soils and tamping said boreholes with sand, concrete or the like
US3312295A (en) * 1965-09-23 1967-04-04 Jr Albert G Bodine Method and apparatus for fluid injection in vibratory driving of piles and the like
GB1230225A (en) * 1967-12-29 1971-04-28
CA933146A (en) * 1970-06-19 1973-09-04 Becker Drills Ltd. Method of drilling and casing a large diameter borehole
DE2133561B2 (en) * 1971-07-06 1973-05-17 Bauer, Karlheinz, Dr Ing , 8898 Schrobenhausen DEEP RUETTLER FOR COMPACTING THE SOIL AND MAKING DRILLING HOLES IN THE SOIL
US3916634A (en) * 1973-03-12 1975-11-04 Roy J Woodruff Method for forming holes in earth and setting subterranean structures therein
US4249836A (en) * 1976-08-02 1981-02-10 Slurry Systems, Inc. Method and apparatus for building below ground slurry walls
JPS54155607A (en) * 1978-04-06 1979-12-07 Hisaharu Nakashima Method of pile driving construction to base rock
US4319784A (en) * 1980-06-04 1982-03-16 Conzinc Riotinto Malaysia Sendirian Berhard Apparatus for water jet and impact drilling and mining

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL18467C (en) * 1900-01-01
FR455730A (en) * 1913-03-20 1913-08-07 Elmer Forrest Estes Device for driving piles or piles
US1574439A (en) * 1922-04-05 1926-02-23 Pringle Wayne Pile construction
US1905643A (en) * 1931-10-14 1933-04-25 Al Johnson Construction Co Apparatus for sinking bodies such as caissons and piles
DE685123C (en) * 1936-07-17 1939-12-12 Johann Keller Fa Process for compacting natural ground or bulges of great thickness with rocking
US2354936A (en) * 1941-12-15 1944-08-01 Emma C Bignell Apparatus for sinking piles
GB753132A (en) * 1952-06-25 1956-07-18 Sergey Steuerman Vibrator devices

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19628769A1 (en) * 1996-07-17 1996-12-12 Bul Sachsen Gmbh Compacting ground, foundations and hardcore by means of vibrator
DE19628769C2 (en) * 1996-07-17 1998-06-10 Bul Sachsen Gmbh Method and device for deep compaction of binding and non-binding compaction material

Also Published As

Publication number Publication date
AU6990981A (en) 1981-11-05
DE3016841A1 (en) 1981-11-26
EP0039474B1 (en) 1983-07-20
DE3016841C2 (en) 1984-11-29
DE3160640D1 (en) 1983-08-25
ZA812475B (en) 1982-04-28
US4415046A (en) 1983-11-15
ATE4233T1 (en) 1983-08-15

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