EP1007795B1 - Procede de pose de tuyaux - Google Patents

Procede de pose de tuyaux Download PDF

Info

Publication number
EP1007795B1
EP1007795B1 EP98902075A EP98902075A EP1007795B1 EP 1007795 B1 EP1007795 B1 EP 1007795B1 EP 98902075 A EP98902075 A EP 98902075A EP 98902075 A EP98902075 A EP 98902075A EP 1007795 B1 EP1007795 B1 EP 1007795B1
Authority
EP
European Patent Office
Prior art keywords
trench
stops
pipe
pipe elements
thixotropic material
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
EP98902075A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1007795A1 (fr
Inventor
Thierry Lauzanne
Gérard ZYGOMALAS
Robert Lacroix
Philippe Saffre
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.)
Eurovia SA
Original Assignee
Entreprise Jean Lefebvre
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 Entreprise Jean Lefebvre filed Critical Entreprise Jean Lefebvre
Publication of EP1007795A1 publication Critical patent/EP1007795A1/fr
Application granted granted Critical
Publication of EP1007795B1 publication Critical patent/EP1007795B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F5/00—Dredgers or soil-shifting machines for special purposes
    • E02F5/02—Dredgers or soil-shifting machines for special purposes for digging trenches or ditches
    • E02F5/10—Dredgers or soil-shifting machines for special purposes for digging trenches or ditches with arrangements for reinforcing trenches or ditches; with arrangements for making or assembling conduits or for laying conduits or cables
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F5/00—Dredgers or soil-shifting machines for special purposes
    • E02F5/02—Dredgers or soil-shifting machines for special purposes for digging trenches or ditches
    • E02F5/12—Dredgers or soil-shifting machines for special purposes for digging trenches or ditches with equipment for back-filling trenches or ditches

Definitions

  • the present invention relates to a method of laying of pipes and filling of trenches with one or more several flows of a thixotropic material.
  • Pipe laying and backfilling cut by conventional methods are a source of constraints related to the safety of men whose presence in the bottom of the trench is necessary to the installation of the pipes, with the quality of installation, especially the thickness and the quality of compaction of the bed and the quality of the pipe coating.
  • the method according to the invention makes it possible to avoid these constraints thanks to the elimination of the laying bed, removing the hose setting at the bottom of the trench, thanks to a perfect coating of the pipe and a good resistance of the fill material which remains however drawable over time.
  • the method according to the invention allows advantageously to dig the trench over a width lower than the imposed standards, to get rid of altimetric adjustment of the pipes in the bottom of the trench before backfilling. Consequently, this saves materials, and for personnel, reduce risk, arduousness and hours of work.
  • Said method is based on the use of properties of Archimedes' push and character thixotropic backfill material.
  • the processes of pipe laying using the properties of thrust Archimedes are known, especially in swampy terrain, where pipes can be laid in bentonic mud in order to hold the walls of the trench.
  • DE-A-2 905 146 describes a process installation of underground pipes which consists of dig a trench and then fill it with a suspension thixotropic, for example a bentonite suspension, which supports the walls of the trench.
  • a suspension thixotropic for example a bentonite suspension
  • US-A-3,993,192 relates to a cleat system for pipeline which limits displacement side of the pipeline during its installation.
  • the wedges are nestable plastic tubs that are fills with a certain amount of soil depending on the pressure that we want to exert on the pipe.
  • the shims described in this document have not for function the altimetric adjustment of the pipe.
  • the trench width l is determined in depending on the outside diameter of the pipe: l is equal to the outside diameter of the added pipe of 200 mm in the where armor and 450mm are not provided when providing shields. l is then possibly rounded to the nearest decimeter.
  • the diameter outside of the pipe is the outside diameter at the collar.
  • Shielding means removable protection staying along the walls of the trench and ensuring the safety of working men in the bottom of the trench. This shielding is compulsory if the depth of the trench is greater than 1350 mm.
  • the width of trench is imposed by the data of the booklet n ° 70 of the applicable General Technical Conditions to public works contracts voted by decree n ° 92-72 January 16, 1992.
  • This width is the sum of outside diameter of the pipe and a constant equal to 800 mm for any diameter less than or equal to 600 mm and equal to 1000 mm for any diameter greater than 600 mm.
  • the method according to the invention makes it possible to reduce the excavation width from 350 to 800 mm in relation to the excavation width in accordance with the specifications of Issue No. 70.
  • the elements of pipes are assembled at the bottom of the trench and at at least three stops are placed in the trench. These stops are positioned by altimetric adjustment, then wedged on the side walls of the trench. They come to cap the pipe elements prohibiting their lateral movements and limiting their upward vertical displacements.
  • the stops are plates, preferably metallic, which have a light opening to the lower part of the plate, oriented towards the bottom of the trench, the width of said corresponding lumen substantially to the outside diameter of the elements of pipes.
  • the background of the light is semi-circular in shape and has a corresponding diameter substantially to the outside diameter of the elements of pipes. The height of the light is greater than outside diameter of the pipe elements.
  • the spacing between the stops is determined by according to the characteristics of the pipe elements, to know inside diameter, outside diameter and mass volume, and depending on the weight of each stop.
  • each stopper is at less equal to the difference between the Archimedes thrust exerted by the thixotropic material on the elements of pipe and the weight of said pipe elements.
  • the backfilling of the trench is then performed in one or more times up to the base of pavement reconstruction.
  • the backfill material must be poured in the trench to a minimum height previously determined by a theoretical calculation.
  • the beta coefficient is the ratio of the wet section squared the outside diameter of the pipe. From the hydraulic relationships given in tables, we deduce from the beta coefficient the height for which there is balance between the weight of the pipe and Archimedes' push. The stop to exercise, if the pipe is flooded, is equal to the difference between the Archimedes thrust and the weight of the pipe.
  • the minimum amount of material backfill to be used during the first stage of backfilling is such that the height reached is greater than the equilibrium height calculated as explained above.
  • the pipes are flooded up to the generator top of the pipe.
  • the pipe goes up to the stops under the effect of the Archimedes thrust exerted by the material of backfilling.
  • Additional backfill is possibly performed with thixotropic material up to the road reconstruction base.
  • the water / cement ratio of this concrete is in the range of 5 to 12.
  • the thixotropic material according to the invention advantageously comprising aggregates consisting of silico-aluminous fly ash provides excellent sealing of the assembly constituted by the pipe and said thixotropic material.
  • Leak tests have been carried out on pipes 5 m long and 400 mm in diameter perforated with one or two 4 mm diameter holes, after backfilling the trench with the material thixotropic according to the invention and with a sand 0/4 limestone.
  • a thixotropic material with a density between 12 kN / m 3 and 20 kN / m 3 , having a sagging cone (measured according to standard NF-P18-451) of the order of 15 cm to the soil condition, an immediate bearing index (measured after 24 hours and according to standard NF-P94-078) greater than a value of 10 and a compressive strength (measured according to standard NF-P98-232.1) of the order of 1 MPa, after final setting.
  • the thixotropic material according to the present invention hardens in about 2 hours.
  • the following examples illustrate the invention without limiting its scope.
  • PVC pipes have an outside diameter of 400 mm.
  • the depth of the trench is 1.20 m.
  • the trench is made over a width of 1.35 m and a depth of 1.20 m plus 0.1 m for the laying bed, which corresponds to a cut volume equal to 1.75 m 3 / ml (meter cube per linear meter).
  • the laying bed is spread over a thickness of 0.1 m, then adjusted and compacted.
  • the pipe elements are assembled and adjusted in altimetry at the bottom of the trench.
  • the coating of the pipe is carried out in successive layers, up to 0.1 m above the upper generator of the pipe, by a man present in the bottom of the trench.
  • the backfill is then carried out to the coast - 0.40 m of reconstruction of the roadway, i.e. a volume of 1.13 m 3 / ml.
  • the repair. of the pavement represents a volume of 0.50 m 3 / ml for the base layers and 170 kg / ml of asphalt for the wearing course in 5 cm thickness.
  • the width of the trench is 600 mm, ie a cut volume of 0.78 m 3 / ml.
  • the pipes are assembled at the bottom of the trench.
  • the backfilling is carried out to the pavement reconstruction coast in one or more times for a total volume equal to 0.41 m 3 / ml, the repair of the pavement representing a volume of 0.20 m 3 / ml for the seat layers and 75 kg / ml for the wearing course in 5 cm thickness.
  • the process according to the invention therefore allows a saving of 0.97 m 3 / ml of cuttings, 0.72 m 3 / ml of fill, 0.3 m 3 / ml for the reconstitution of the ground layer of the roadway , and 95 kg / ml of asphalt for the wearing course, that is to say a material saving of between 55 and 60%.
  • 90A concrete pipes have an outside diameter of 500 mm.
  • the depth of the trench is 2.50 m.
  • the installation of shielding is compulsory.
  • the trench is made over a width of 1.45 m and a depth of 2.5 m, which corresponds to a cut volume equal to 3.9 m 3 / ml.
  • the laying bed is 0.145 m 3 / ml and the pavement reconstruction fill 2.73 m 3 / ml.
  • the repair of the pavement represents a volume of 0.53 m 3 / ml for the base layers, and 180 kg / ml of asphalt for the wearing course in 5 cm thickness.
  • the width of the trench which includes the shielding is 1.10 m, i.e. a cut volume of 2.86 m 3 / ml.
  • the backfilling is carried out to the pavement reconstruction coast in one or more times for a total volume equal to 2.11 m 3 / ml, and the road repair is carried out for a volume of 0.39 m 3 / ml for the base layers and 137 kg / ml of asphalt for the wearing course in 5 cm thickness.
  • the process according to the invention therefore allows a saving of 1.04 m 3 / ml of cuttings, 0.64 m 3 / ml of fill, 0.14 m 3 / ml for the reconstitution of the layers of the pavement, and 43 kg / ml of mixes for the wearing course, that is to say a material saving of approximately 25%.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Sewage (AREA)
  • Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
  • Road Paving Structures (AREA)
  • Pipe Accessories (AREA)
EP98902075A 1997-01-16 1998-01-14 Procede de pose de tuyaux Expired - Lifetime EP1007795B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9700395 1997-01-16
FR9700395A FR2758378B1 (fr) 1997-01-16 1997-01-16 Procede de pose de tuyaux
PCT/FR1998/000060 WO1998031880A1 (fr) 1997-01-16 1998-01-14 Procede de pose de tuyaux

Publications (2)

Publication Number Publication Date
EP1007795A1 EP1007795A1 (fr) 2000-06-14
EP1007795B1 true EP1007795B1 (fr) 2002-04-24

Family

ID=9502648

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98902075A Expired - Lifetime EP1007795B1 (fr) 1997-01-16 1998-01-14 Procede de pose de tuyaux

Country Status (6)

Country Link
EP (1) EP1007795B1 (cs)
CA (1) CA2278224C (cs)
CZ (1) CZ297610B6 (cs)
ES (1) ES2173566T3 (cs)
FR (1) FR2758378B1 (cs)
WO (1) WO1998031880A1 (cs)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2830269B1 (fr) 2001-09-28 2004-07-09 Eurovia Man Procede de preparation d'un remblai autocompactant, remblai autocompactant et utilisation
FR2851316B1 (fr) * 2003-02-13 2007-04-20 Gaz De France Procede de pose d'lelements tubulaires enterres et preparation de mortier pour sa mise en oeuvre
BE1021367B1 (fr) * 2013-02-06 2015-11-06 Etablissements Hublet Remblais autocompactant reexcavable.
FR3101648B1 (fr) 2019-10-04 2021-11-26 Greffet Dispositif de cureuse de fossé doté d’une technologie particulière de captation et de relevage de toutes les natures et constituants de terre et de boues, adaptable sur un tracteur de puissance maximum de 100ch aux fins d’être utilisé pour des routes étroites et sinueuses.

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1392931A (en) * 1971-08-14 1975-05-07 Holroyd L M Laying of pipes
DE2437012C3 (de) * 1974-08-01 1979-08-09 Gewerkschaft Eisenhuette Westfalia, 4670 Luenen Vorrichtung zum Verlegen eines Rohrstranges in einem Graben, insbesondere in wasserführenden Böden
US3993192A (en) * 1975-11-10 1976-11-23 Christopher Brian Bunn Pipeline weight container and method
IT1091898B (it) * 1977-01-26 1985-07-06 Soletanche Perfezionamenti alla messa in opera di canalizzazioni interrate
DE2905146A1 (de) * 1979-02-10 1980-08-21 Rolf Stahn Verfahren zur herstellung unterirdischer leitungen in einer fluessigkeitsgestuetzten baugrube
US4836595A (en) * 1988-05-05 1989-06-06 Dicarlo Frank Pipe handling apparatus
GB9018927D0 (en) * 1990-08-30 1990-10-17 Seamark Systems Subsea pipeline protection

Also Published As

Publication number Publication date
FR2758378A1 (fr) 1998-07-17
WO1998031880A1 (fr) 1998-07-23
CZ297610B6 (cs) 2007-02-14
EP1007795A1 (fr) 2000-06-14
ES2173566T3 (es) 2002-10-16
CZ9902506A3 (cs) 2001-01-17
CA2278224A1 (fr) 1998-07-23
CA2278224C (fr) 2005-03-29
FR2758378B1 (fr) 1999-04-02

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