EP1279772A1 - Dispositif de surveillance d' un raccordement - Google Patents

Dispositif de surveillance d' un raccordement Download PDF

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Publication number
EP1279772A1
EP1279772A1 EP02077738A EP02077738A EP1279772A1 EP 1279772 A1 EP1279772 A1 EP 1279772A1 EP 02077738 A EP02077738 A EP 02077738A EP 02077738 A EP02077738 A EP 02077738A EP 1279772 A1 EP1279772 A1 EP 1279772A1
Authority
EP
European Patent Office
Prior art keywords
sheet pile
sheet
pin
conductor
lower transverse
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.)
Withdrawn
Application number
EP02077738A
Other languages
German (de)
English (en)
Inventor
Manfred Albert Hoffmann
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.)
Hoffmann Bodemtechnieken BV
Original Assignee
Hoffmann Bodemtechnieken BV
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
Application filed by Hoffmann Bodemtechnieken BV filed Critical Hoffmann Bodemtechnieken BV
Publication of EP1279772A1 publication Critical patent/EP1279772A1/fr
Withdrawn legal-status Critical Current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
    • E02D13/00—Accessories for placing or removing piles or bulkheads, e.g. noise attenuating chambers
    • E02D13/06—Accessories for placing or removing piles or bulkheads, e.g. noise attenuating chambers for observation while placing

Definitions

  • the invention relates to a method for monitoring the interlocking engagement of sheet piles driven into the ground, which slidably engage each other with their profiled longitudinal edges.
  • the invention furthermore relates to a device for monitoring the interlocking engagement of sheet piles driven into the ground, which slidably engage each other with profiled longitudinal edges, according to the method according to the invention.
  • Sheet pile walls in which successive sheet piles engaging each other with their profiled longitudinal edges are driven or vibrated into the ground, is generally known and used, for example, for constructing campsheds along waterways so as to make the campshed watertight.
  • Sheet pile walls are also installed for the purpose of isolating polluted soil and ground water, the latter in the case of groundwork, for example, such as the construction of sewers or tunnels, when ground water must not interfere with the work and hinder the workers.
  • the metal sheet piles which are provided with profiled longitudinal edges, are usually driven into the ground one by one by means of a crane and a vibrating or pile driving device, in which the profiled longitudinal edges of a sheet pile to be installed and a sheet pile already installed interlock.
  • An example of a mechanical monitoring system comprises a detection wire, which is connected to a pin that is passed through the profile near the lower transverse edge.
  • the pin and the detection wire are driven into the ground together with the sheet pile in question, after which the pin and/or the detection wire are severed or otherwise destroyed by the next sheet pile in the situation in which the sheet piles interlock along their entire length.
  • the rupture of the detection wire can be detected in various ways, for example by pulling up the wire. Such rupture detection is for example demonstrated in NL-93/01636.
  • Such monitoring systems employing a detection wire are not 100% accurate, however, since the rupture of the detection wire may also be caused by other factors, for example by obstacles that are present in the ground when the sheet pile is being driven into the ground. In such a situation it is impossible to establish with certainty whether the sheet piles actually interlock along their entire length.
  • An electronic monitoring system employs electromagnetic sensors, which detected a change in an applied magnetic field caused by the passage of the lower transverse edge of the next sheet pile.
  • Another electronic monitoring system is based on the interruption of a circuit caused by the rupture of an electrical conductor by the lower transverse edge of the next sheet pile.
  • the object of the invention to provide a monitoring system which, in contrast to the known monitoring systems, make's it possible to monitor the full interlocking engagement of sheet piles in the ground with a significantly greater degree of accuracy.
  • the method is according to the invention characterized in that a contact element comprising an upwardly extending conductor is fitted in the profile of a sheet pile to be installed, near the lower transverse edge thereof, wherein, after the sheet pile has been installed, the conductor is connected, via a power source, to a next sheet pile joining the sheet pile already installed, and if the profiled longitudinal edges of the two sheet piles interlock along the entire length of the sheet piles, the lower transverse edge of the next sheet pile will be brought into electric contact with said contact element.
  • the monitoring system according to the invention is based on the closing of a circuit by the next sheet pile to be installed, which closing can be detected in various ways.
  • the failure of said circuit to close is a direct indication that the two sheet piles in the ground do not fully interlock.
  • One embodiment of a monitoring device for carrying out the method according to the invention is characterized in that the device comprises a metal pin extending into the profile of a sheet pile already installed, in which the pin can be connected, via an electrical, upwardly extending conductor and a power source, to a next sheet pile to be connected to the sheet pile that is are ready present, in such a manner that the lower transverse edge of said next sheet pile can be brought into electric contact with said pin in the case of a full interlocking engagement between the sheet piles.
  • At least one covering consisting of an electrically insulating material surrounds the metal pin.
  • the pin provided with a covering may be accommodated in a length of pipe extending into the profile.
  • said covering is a length of hose made of silicone rubber, which can be fitted round the pin; more in particular, said covering consists of two lengths of hose made of different materials, which are slid into each other.
  • the length of pipe is arranged on a flange which can be fixed to the lower transverse edge of the sheet pile.
  • a more robust construction is obtained, so that the device will be affected less by the vibrations and the shocks to which it is exposed when the pile is being driven into the ground, which has a positive effect on the functionality of the device and consequently reduces the risk of damage and failure.
  • the flange screens the profile of the longitudinal edge accommodating the contact pin, so that there will be no risk of soil accumulating in the profile upon installation of the pile and damage being caused to the contact pin.
  • the flange comprises an upwardly bent portion extending beyond the longitudinal edge of the sheet pile.
  • Said flange may be provided with a pull relief device for the electrical conductor on its upwardly facing side,
  • the current-carrying conductor in order to prevent damage to the current-carrying conductor, and in particular in order to prevent rupture of the conductor and consequent failure of the device, is passed through a pipe fixed to the sheet pile.
  • the invention also relates to a sheet pile fitted with the device according to the invention.
  • Figure 1 shows a sheet pile wall built up from sheet piles 1 and 2, respectively, in which the sheet piles are installed in the ground with their profiled longitudinal edges 1b and 2a, respectively, interlocking.
  • the sheet pile 2 has not been driven into the ground completely yet, for example by means of a crane (not shown) and a pile driving and/or vibrating device.
  • the interlocking of adjacent sheet piles takes place by means of the profiled longitudinal edges 1a, 1b, 2a and 2b that are shown in Figure 2.
  • the sheet piles 1 and 2 which preferably have a specific shape (a U-shape in this situation), have complementary longitudinal edges which, when slid into each other, are capable of forming a watertight sheet pile wall.
  • Figure 2 shows an embodiment of a monitoring system according to the invention, which functions to signal the interlocking engagement along their entire length of the two profiled longitudinal edges 1b and 2a, respectively.
  • the device according to the invention for monitoring the interlocking engagement of said two profiled longitudinal edges comprises a contact pin 4, which can extend into the lock 3 formed by the profile 1b.
  • the device furthermore comprises a flange 5, which can be fixed to the lower transverse edge 1c of the sheet pile 1, for example by welding.
  • the contact pin 4 is accommodated in a length of pipe 8, which is welded to the flange 5 at A.
  • the contact pin 4 is provided with an electrical conductor 9, which is passed to the upper side via a pull relief device 10, at which upper side it can be connected to the next sheet pile 2 (see Figure 2) via a power source 11.
  • said contact pin is according to the invention surrounded by a covering 7a (see Figures 3A and 3B), which covering is preferably made of an electrically insulating material, more in particular silicone rubber.
  • a covering 7a which covering is preferably made of an electrically insulating material, more in particular silicone rubber.
  • the contact pin 4 provided with the covering 7a is accommodated in a length of pipe 8 which is fixed to the flange 5.
  • the length of pipe 8 is provided with an opening at the location indicated at 8a and the flange 5, at which opening the current-carrying conductor 9 provided with a covering 7b is connected to the contact pin 4. Because the length of pipe 8, in which the contact pin 4 provided with a covering 7a and the current-carrying conductor 9 are accommodated, are according to the invention fixed to the flange 5 at A, preferably by welding, the covering 7b must not only be flexible but also heat-resistant.
  • Said flexible, heat-resistant covering 7b may cover the entire contact pin 4, but it is also possible for the covering 7b to blend into another type of covering 7a in the direction of the free end of the contact pin 4, which covering 7a will be arranged round the covering 7b in that case.
  • the essence of the invention is comprised in the fact that when the sheet pile 2 is being driven into the ground, the lower end edge 2c will come into contact with the covered contact pin 4 if the two profiled longitudinal edges 1b and 2a interlock along their entire length, and damage the covering 7a to such an extent that an electric circuit will be closed.
  • the closing of the circuit can be detected by suitable means, for example a lamp or a loudspeaker.
  • suitable means for example a lamp or a loudspeaker.
  • the interlocking engagement of the two sheet piles can be monitored with greater accuracy than is possible with the applications that have been known so far.
  • the flange 5 as shown in Figure 2 is fixed to the lower transverse edge 2c and the profile 1b of the sheet pile 1, more in particular by welding.
  • the flange 5 protects the current-carrying conductor 9 as well as the contact pin 4 extending into the lock 3 of the profiled longitudinal edge 1b, in particular while the sheet pile 1 is being driven into the ground.
  • damage being caused to the current-carrying conductor and to the contact pin 4 upon driving the sheet pile 1 into the ground, which might result in an inaccurate operation of the monitoring system.
  • the current carrying conductor is passed to the upper side through a pipe which is welded to the sheet pile 1.
  • this latter measure prevents unhoped-for damage to or rupture of the electrical conductor 10, which would inevitably cause the monitoring system not to function any more.
  • the bent part 6 of the flange 5 functions as an additional means of protection for the contact pin 4. Said bent part 6 extends beyond the profiled longitudinal edge 1a of the sheet pile 1, as is shown in Figure 3B. The bent part 6 can be fixed to the sheet pile 1 by welding, thus providing additional strength and protection when the sheet pile 1 is being driven into the ground.
  • the sheet pile 2 is fitted with a corresponding version of the monitoring device according to the invention near the transverse edge 2c and the profiled longitudinal edge 2b.
  • the contact pin 4' is accommodated in the lock 3" of the profiled longitudinal edge 2b.
  • a corresponding flange 5' is welded to the lower side of the transverse edge 2c.
  • the device for monitoring the interlocking engagement of two sheet piles can be constructed in a very simple manner and comprises a minimum number of parts. In addition to that, the device is of a very robust construction, which further guarantees the proper functioning thereof, even under the most severe conditions to which it is exposed when the sheet pile is being driven into the ground.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Bulkheads Adapted To Foundation Construction (AREA)
EP02077738A 2001-07-27 2002-07-08 Dispositif de surveillance d' un raccordement Withdrawn EP1279772A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1018647A NL1018647C2 (nl) 2001-07-27 2001-07-27 Slotcontrole-inrichting.
NL1018647 2001-07-27

Publications (1)

Publication Number Publication Date
EP1279772A1 true EP1279772A1 (fr) 2003-01-29

Family

ID=19773797

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02077738A Withdrawn EP1279772A1 (fr) 2001-07-27 2002-07-08 Dispositif de surveillance d' un raccordement

Country Status (2)

Country Link
EP (1) EP1279772A1 (fr)
NL (1) NL1018647C2 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7908262A (nl) * 1979-11-12 1981-06-01 Hollandsche Betongroep Nv Werkwijze voor het in de grond heien van damplanken en het afdichten van de damwand alsmede inrichting voor het toepassen van de werkwijze.
EP0431710A1 (fr) * 1989-12-08 1991-06-12 Hollandsche Beton Groep N.V. Système de signalisation de raccordement
EP0715027A1 (fr) * 1994-12-02 1996-06-05 van Halteren, Tijmen Méthode pour former une paroi de palplanches par enforcement

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL9301636A (nl) 1993-09-22 1995-04-18 Tijmen Van Halteren Werkwijze voor het slaan van een damwand.

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7908262A (nl) * 1979-11-12 1981-06-01 Hollandsche Betongroep Nv Werkwijze voor het in de grond heien van damplanken en het afdichten van de damwand alsmede inrichting voor het toepassen van de werkwijze.
EP0431710A1 (fr) * 1989-12-08 1991-06-12 Hollandsche Beton Groep N.V. Système de signalisation de raccordement
EP0715027A1 (fr) * 1994-12-02 1996-06-05 van Halteren, Tijmen Méthode pour former une paroi de palplanches par enforcement

Also Published As

Publication number Publication date
NL1018647C2 (nl) 2003-01-28

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