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WO1996031661A1 - Systeme de drainage pour drainer l'eau d'une couche de terrain - Google Patents

Systeme de drainage pour drainer l'eau d'une couche de terrain Download PDF

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Publication number
WO1996031661A1
WO1996031661A1 PCT/NL1996/000148 NL9600148W WO9631661A1 WO 1996031661 A1 WO1996031661 A1 WO 1996031661A1 NL 9600148 W NL9600148 W NL 9600148W WO 9631661 A1 WO9631661 A1 WO 9631661A1
Authority
WO
WIPO (PCT)
Prior art keywords
grid
drainage system
draining means
draining
passage openings
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.)
Ceased
Application number
PCT/NL1996/000148
Other languages
English (en)
Inventor
Marinus Antonie Viergever
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.)
STICHTING GRONDMECHANICA DELFT
Original Assignee
STICHTING GRONDMECHANICA DELFT
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 STICHTING GRONDMECHANICA DELFT filed Critical STICHTING GRONDMECHANICA DELFT
Priority to AU51264/96A priority Critical patent/AU5126496A/en
Publication of WO1996031661A1 publication Critical patent/WO1996031661A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • E02D3/02—Improving by compacting
    • E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B11/00—Drainage of soil, e.g. for agricultural purposes

Definitions

  • the present invention relates to a drainage system for draining water from a ground layer, which system comprises at least one draining means to be inserted to a specific depth of insertion.
  • a drainage system is known from, e.g., the
  • the consolidation time of the compressible layers mainly depends on the permeability of the drainage material and the intervals between the draining means. In the above discussed prior art these intervals are about 0.7 - 2.0 m and cannot be reduced in view of the width of the plastic strips and in view of the process to be applied to drive the draining means into the sludge deposit. This has the result that a clear shortening of the consolidation time is hardly possible with the known drainage means and the process for inserting them.
  • the object of the invention is to solve the above- described problem by providing a drainage system of the above- mentioned type which is characterized in that it comprises a series of draining means running substantially parallel to each other at short intervals, which draining means extend from the depth of insertion in substantially vertical direction.
  • a drainage system which, on the one hand, clearly shortens the consolidation time and, on the other hand, can be easily inserted in the ground layer.
  • a suitable spacing for draining means is, e.g., 50 mm to 100 mm. In any case, this spacing must be substantially less than the hitherto conventional spacing between drains, that is to say substantially less than ca. 1 m.
  • the drainage system according to the invention ca. 3 times as much sludge can be dewatered per time unit as with the known drainage systems. A sludge deposit will therefore be dewatered much more rapidly and have sufficient bearing capacity to start or otherwise apply building activities thereon.
  • a drainage system to be produced in a very easy and inexpensive manner is obtained when the draining means are made of threads and the water is drained through the space between the fibers in the thread. From a viewpoint of environmental engineering, it is particularly advantageous when the threads are made of a naturally degradable material, such as, e.g., coconut, hemp or jute.
  • the draining means are fastened with a first end to a grid element which, from a viewpoint of environmental engineering, is also preferably made of a naturally degradable material, such as, e.g., a naturally degradable plastic.
  • the invention also relates to a process which is preferably suitable for inserting a drainage system in a ground layer according to the invention, which process comprises fastening the draining means to the grid element and then driving the drainage system by means of a drive-in section into the ground layer to the depth of insertion, and cutting off the draining means of the drain after driving in on the side facing away from the first end. It is particularly advantageous when during insertion the draining means of the drainage system are kept at intervals by means of a guide element.
  • the drainage system is inserted in a first layer of the ground layer which may later be provided with further layers, on the surface of which first layer the draining means fall after cutting off so that, subsequently, they form a horizontal drainage surface.
  • the invention also relates to a drive-in section for carrying out the process according to the invention, which drive-in section comprises a cage or shaft element with a supporting frame, on the lower side of which supporting frame is arranged the grid element of the drainage system.
  • Fig. 1 is a perspective view of an example of embodiment of the drainage system according to the invention during insertion in a sludge deposit;
  • Fig. 2 is a front view of the drainage system with a horizontal drainage surface being formed
  • Fig. 3 is a perspective view of a two-part grid
  • Fig. 4 is a side view of the two-part grid in a thread feeding position
  • Fig. 5 is a side view of the two-part grid in a thread gripping position
  • Fig. 6 is a sectional view of a rib of the lower and the upper grid of the two-part grid.
  • Fig. 1 shows a drainage system 1 according to the invention during insertion in a ground layer 2, e.g., a sludge deposit.
  • the insertion is effected from a pontoon 3, e.g. by means of a hoisting apparatus 4.
  • the drainage system 1 is built up from a series of draining means 5 running substantially parallel to each other at short intervals, which draining means 5 preferably consist of water- permeable threads made of naturally degradable material, such as, e.g., coconut, hemp or jute.
  • the threads 5 are fastened with a first end to the crossings of a grid element 6 which is also made of a naturally degradable material, and which is driven into the ground layer at a specific depth of insertion.
  • the depth of insertion often corresponds to the depth of the deposit, in other words, the grid element 6 is often placed on the bottom 7 of the deposit.
  • the deposit is first filled with a layer of sand or with a layer of sludge which has meanwhile been consolidated to the extent that the insertion of the grid is no longer possible. In that case the depth of insertion is determined by the upper surface of the sand layer or the consolidated first sludge layer.
  • a drive-in section 8 which comprises a cage or shaft element 9 and a supporting frame 10, the grid element 6 of the drainage system being disposed on the lower side of the supporting frame 10 in such a manner that the threads 5 of the drainage system 1 mainly extend in the vertical direction.
  • the drive-in section 8 is inserted in the sludge deposit 2 in a known manner by means of the hoisting apparatus 4 located on the pontoon 3, the threads 5 of the drainage system 1 being unwound from a winding device 11.
  • the front side of the winding device 11 or the pontoon 3 is provided with a guide element 12 which keeps the threads 5 of the drainage system 1 at the desired intervals during driving in.
  • the threads 5 are cut off and the drive-in section 8 is drawn ouf of the sludge deposit 2. Subsequently, the hoisting apparatus 4 with the winding device 11 and the drive-in section 8 is moved, and a next drainage system 1 can be inserted in the sludge deposit 2.
  • Fig. 2 shows the drainage system 1 according to the invention after insertion in a sludge deposit 2 which has not yet been filled completely.
  • the threads 5 When the threads 5 are cut off, they fall on the top side 13 of the sludge deposit 2 and form a horizontal drainage surface 14.
  • a new layer of sludge can be deposited on the drainage surface thus formed, optionally after depositing a sand layer.
  • the horizontal drainage surface forms a kind of drainage mattress which ensures lateral draining of the water from the deposit.
  • such a horizontal drainage surface forms a bearing surface, which drainage surface may serve instead of a bearing surface created by means of a geofabric.
  • the grid element 6 can be provided with an upper grid 15 and a lower grid 16 which are arranged for movement relative to each other.
  • a part of such a grid 6 is shown in Fig. 3 in perspective.
  • the passage openings 15a of the upper grid 15 are in line with passage openings 16a of the lower grid 16.
  • the lower grid 15 has moved relative to the upper grid so that the passage openings 15a of the upper grid 15 are in line with passage openings 16a located beside the above-mentioned passage openings 16a.
  • the lower grid 16 abuts with an upper side against the upper grid 15 so that the draining means 5 are gripped between the upper and the lower grid.
  • the movement of the lower grid 16 relative to the upper grid 15 may take place, e.g., along a guide 19 and may be energized by a hydraulic, electric or pneumatic drive unit, such as a motor or a piston/cylinder assembly.
  • a hydraulic, electric or pneumatic drive unit such as a motor or a piston/cylinder assembly.
  • the grid element 6 When the draining means 5 are fastened to the grid element 6, the grid element 6 is set to the thread feeding position, after which the draining means 5 are passed through the passage openings of the grid 6 and the grid element 6 is then set to the thread gripping position while gripping the draining means 5. Subsequently, as described above, the grid 6 can be driven into the sludge deposit 2.
  • the lower grid 16 may be moved relative to the upper grid 15 so that the grid 6 is in the thread feeding position again. In this thread feeding position the grid 6 can be moved up again while the threads remain behind. Thus the grid 6 is not lost and can be repeatedly used for the insertion of the threads 5. It is of course also possible, however, that the grid 6 is left behind at the desired depth of insertion and that a new grid is used each time.
  • threads may also be made of plastic.
  • other forms may be conceived for the drive-in section. Under specific conditions the threads may also be at an angle to the vertical.

Landscapes

  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Agronomy & Crop Science (AREA)
  • Civil Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Soil Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)

Abstract

L'invention concerne un système de drainage (1) pour drainer l'eau d'une couche de terrain (2), ce système comprenant au moins un moyen de drainage (5) inséré à une profondeur spécifique. Ce système de drainage comprend une série de moyens de drainage disposés sensiblement parallèlement les uns aux autres à des distances réciproques courtes. Ces moyens de drainage (5) s'enfoncent à la profondeur souhaitée d'une manière sensiblement verticale.
PCT/NL1996/000148 1995-04-07 1996-04-09 Systeme de drainage pour drainer l'eau d'une couche de terrain Ceased WO1996031661A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU51264/96A AU5126496A (en) 1995-04-07 1996-04-09 Drainage system for draining water from a layer of the groun d

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1000092 1995-04-07
NL1000092A NL1000092C2 (nl) 1995-04-07 1995-04-07 Drainagesysteem voor het afvoeren van water uit een grondlaag.

Publications (1)

Publication Number Publication Date
WO1996031661A1 true WO1996031661A1 (fr) 1996-10-10

Family

ID=19760854

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NL1996/000148 Ceased WO1996031661A1 (fr) 1995-04-07 1996-04-09 Systeme de drainage pour drainer l'eau d'une couche de terrain

Country Status (3)

Country Link
AU (1) AU5126496A (fr)
NL (1) NL1000092C2 (fr)
WO (1) WO1996031661A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7811388A (nl) * 1978-11-17 1980-05-20 Koninkl Aabe Fabrieken B V Draineerelement voor vertikale drainage.
GB1600737A (en) * 1977-03-22 1981-10-21 Univ Singapore Drainage of soils
WO1981003354A1 (fr) * 1980-05-22 1981-11-26 M Juhola Procede et moyen permettant de creer un drainage vertical
JPS59109610A (ja) * 1982-12-15 1984-06-25 Tokyu Constr Co Ltd マンドレル打込装置
WO1990007611A1 (fr) * 1988-12-26 1990-07-12 Entreprises Morillon Corvol Courbot S.A. Engin de travaux publics utilisable notamment pour la pose de drains verticaux

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1600737A (en) * 1977-03-22 1981-10-21 Univ Singapore Drainage of soils
NL7811388A (nl) * 1978-11-17 1980-05-20 Koninkl Aabe Fabrieken B V Draineerelement voor vertikale drainage.
WO1981003354A1 (fr) * 1980-05-22 1981-11-26 M Juhola Procede et moyen permettant de creer un drainage vertical
JPS59109610A (ja) * 1982-12-15 1984-06-25 Tokyu Constr Co Ltd マンドレル打込装置
WO1990007611A1 (fr) * 1988-12-26 1990-07-12 Entreprises Morillon Corvol Courbot S.A. Engin de travaux publics utilisable notamment pour la pose de drains verticaux

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
"Draineren met karton", MISSET'S BOUWWERELD, vol. 59, no. 18, 30 August 1963 (1963-08-30), pages 1332 - 1333, XP002006614 *
PATENT ABSTRACTS OF JAPAN vol. 8, no. 227 (M - 332)<1664> 18 October 1984 (1984-10-18) *

Also Published As

Publication number Publication date
NL1000092C2 (nl) 1996-10-08
AU5126496A (en) 1996-10-23

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