EP1007795B1 - Procede de pose de tuyaux - Google Patents
Procede de pose de tuyaux Download PDFInfo
- 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
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)
- Pipe Accessories (AREA)
- Road Paving Structures (AREA)
Description
- des granulats de diamètre maximal inférieur à 20 mm, par exemple des cendres volantes silico-alumineuses,
- un liant représentant 2 à 6 % du poids sec des granulats,
- un agent hydro-réducteur, par exemple des fibres naturelles ou synthétiques, en particulier des fibres polymères acryliques, représentant 0,05 à 0,15 % du poids sec des granulats.
Les exemples suivants illustrent l'invention sans en limiter le portée.
Claims (21)
- Procédé de pose de tuyaux, caractérisé en ce qu'il comprend les opérations successives suivantes :a) Réalisation d'une tranchée à une largeur l et à une profondeur P et assemblage entre eux des éléments de tuyaux au fond de la tranchée.b) Mise en place et réglage altimétrique de butées aptes à contrôler le déplacement des éléments de tuyaux assemblés.c) Remblaiement de ladite tranchée à une hauteur H avec un matériau thixotrope à l'état de sol, de façon à faire remonter les éléments de tuyaux sous l'effet de la poussée d'Archimède jusqu'à la position déterminée par les butées.d) Retrait des butées lorsque le matériau thixotrope est à l'état de gel, les éléments de tuyaux restant immobiles.e) Eventuel remblaiement complémentaire de la tranchée.
- Procédé selon la revendication 1, caractérisé en ce que la largeur l est égale au diamètre extérieur du tuyau ajouté de 200 mm, en l'absence de blindage.
- Procédé selon la revendication 1, caractérisé en ce que la largeur l est égale au diamètre extérieur du tuyau ajouté de 450 mm lorsque l'on prévoit des blindages.
- Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que les butées viennent coiffer les éléments de tuyaux interdisant leurs déplacements latéraux et limitant leurs déplacements verticaux ascendants.
- Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que les butées sont des plaques, de préférence métalliques, qui comportent une lumière débouchant à la partie inférieure de la plaque, orientée vers le fond de la tranchée, la largeur de ladite lumière correspondant sensiblement au diamètre extérieur des éléments de tuyaux.
- Procédé selon la revendication 5, caractérisé en ce que le fond de la lumière est de forme hémi-circulaire et présente un diamètre correspondant sensiblement au diamètre extérieur des éléments de tuyaux.
- Procédé selon la revendication 6, caractérisé en ce que la hauteur de la lumière h est supérieure au diamètre extérieur des éléments de tuyaux.
- Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que H est telle que la lumière des butées est noyée dans le matériau thixotrope.
- Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le nombre de butées mises en place est supérieur ou égal à trois.
- Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que l'espacement entre les butées est déterminé en fonction des caractéristiques des éléments de tuyaux, à savoir diamètre intérieur, diamètre extérieur et masse volumique, et en fonction du poids de chaque butée.
- Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la réaction exercée sur chaque butée est au moins égale à la différence entre la poussée d'Archimède exercée par le matériau thixotrope sur les éléments de tuyau et le poids desdits éléments de tuyau.
- Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que, après réglage altimétrique, les butées sont calées sur les parois latérales de la tranchée.
- Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le remblaiement de la tranchée est réalisé en une ou plusieurs fois jusqu'à la base de reconstitution de chaussée.
- Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le matériau thixotrope est un béton.
- Procédé selon la revendication 14, caractérisé en ce que le béton comprend :des granulats de diamètre maximal inférieur à 20 mm,un liant représentant 2 à 6 % du poids sec des granulats,un agent hydro-réducteur représentant 0,05 à 0,15 % du poids sec des granulats.
- Procédé selon la revendication 15, caractérisé en ce que les granulats sont constitués de cendres volantes silico-alumineuses.
- Procédé selon l'une des revendications 15 et 16, caractérisé en ce que le rapport eau/ciment est compris entre 5 et 12.
- Procédé selon l'une des revendications 15 à 17, caractérisé en ce que l'agent hydro-réducteur comprend des fibres naturelles ou synthétiques, en particulier des fibres polymères acryliques.
- Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le matériau thixotrope a un poids volumique compris entre 12 kN/m3 et 20 kN/m3.
- Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le matériau thixotrope présente :un affaissement au cône de l'ordre de 15 cm à l'état de sol,un indice portant immédiat supérieur à une valeur de 10, mesuré après 24 heures.
- Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le matériau thixotrope durcit en 2 heures environ et présente une résistance en compression de l'ordre de 1 MPa, après prise définitive.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9700395A FR2758378B1 (fr) | 1997-01-16 | 1997-01-16 | Procede de pose de tuyaux |
FR9700395 | 1997-01-16 | ||
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 (fr) |
CA (1) | CA2278224C (fr) |
CZ (1) | CZ297610B6 (fr) |
ES (1) | ES2173566T3 (fr) |
FR (1) | FR2758378B1 (fr) |
WO (1) | WO1998031880A1 (fr) |
Families Citing this family (4)
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)
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 |
-
1997
- 1997-01-16 FR FR9700395A patent/FR2758378B1/fr not_active Expired - Lifetime
-
1998
- 1998-01-14 ES ES98902075T patent/ES2173566T3/es not_active Expired - Lifetime
- 1998-01-14 CA CA002278224A patent/CA2278224C/fr not_active Expired - Lifetime
- 1998-01-14 EP EP98902075A patent/EP1007795B1/fr not_active Expired - Lifetime
- 1998-01-14 CZ CZ0250699A patent/CZ297610B6/cs not_active IP Right Cessation
- 1998-01-14 WO PCT/FR1998/000060 patent/WO1998031880A1/fr active IP Right Grant
Also Published As
Publication number | Publication date |
---|---|
CA2278224A1 (fr) | 1998-07-23 |
WO1998031880A1 (fr) | 1998-07-23 |
FR2758378B1 (fr) | 1999-04-02 |
EP1007795A1 (fr) | 2000-06-14 |
FR2758378A1 (fr) | 1998-07-17 |
CZ9902506A3 (cs) | 2001-01-17 |
ES2173566T3 (es) | 2002-10-16 |
CZ297610B6 (cs) | 2007-02-14 |
CA2278224C (fr) | 2005-03-29 |
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