WO1998031880A1 - Method for fitting pipes - Google Patents
Method for fitting pipes Download PDFInfo
- Publication number
- WO1998031880A1 WO1998031880A1 PCT/FR1998/000060 FR9800060W WO9831880A1 WO 1998031880 A1 WO1998031880 A1 WO 1998031880A1 FR 9800060 W FR9800060 W FR 9800060W WO 9831880 A1 WO9831880 A1 WO 9831880A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- trench
- pipe elements
- stops
- pipe
- thixotropic material
- Prior art date
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 pipes and backfilling trenches with one or more flows of a thixotropic material.
- Pipe laying and trench backfilling by conventional methods are a source of constraints related to the safety of men whose presence in the bottom of the trench is necessary for the installation of pipes, to the quality of laying, in particular the thickness and quality of compaction of the bedding 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, to the elimination of the adjustment of the pipe at the bottom of the trench, thanks to a perfect coating of the pipe and to a good resistance of the backfill material. which remains drawable over time.
- the method according to the invention advantageously makes it possible to dig the trench over a width less than the standards imposed, to overcome the altimetric adjustment of the pipes in the bottom of the trench before backfilling. Consequently, this makes it possible to save materials, and for the personnel, to reduce the risks, the arduousness and the duration of the work.
- Said method is based on the use of the properties of the Archimedes thrust and of the thixotropic nature of the backfill material.
- Pipe laying methods using the properties of Archimedes' thrust are known, in particular in marshy terrain, where pipes can be laid in bentonic mud to hold the walls of the trench.
- DE-A-2 905 146 describes a process for installing underground pipes which consists in digging a trench and then filling it with a thixotropic suspension, for example a bentonite suspension, which makes it possible to support the walls of the trench.
- a thixotropic suspension for example a bentonite suspension
- US-A-3 993 192 relates to a system of shims for pipelines which makes it possible to limit the lateral displacement of the pipeline during its installation.
- the holds are nestable plastic tubs that are filled with a certain amount of soil depending on the pressure that you want to exert on the pipe.
- the shims described in this document do not have the function of adjusting the altimetry of the pipe.
- the method according to the invention comprises the following successive operations: a) Construction of a trench at a width 1 and at a depth P and assembly between them of the pipe elements at the bottom of the trench. b) Installation and altimetric adjustment of stops capable of controlling the movement of the assembled pipe elements. c) Backfilling of said trench at a height H with a thixotropic material in the ground state, so as to raise the pipe elements under the effect of Archimedes' push. d) Removal of the stops when the thixotropic material is in the gel state, the pipe elements remaining stationary. e) Possible additional backfilling of the trench.
- the width of trench 1 is determined as a function of the outside diameter of the pipe: 1 is equal to the outside diameter of the added pipe of 200 mm in the case where there is no shielding and 450 mm when the shielding is provided . 1 is then optionally rounded to the nearest decimeter.
- the outside diameter of the pipe is the outside diameter at the collar.
- shielding is meant a removable protection housed along the walls of the trench and making it possible to ensure the safety of the men working in the bottom of the trench. This shielding is compulsory if the depth of the trench is greater than 1350 mm.
- the width of the trench is imposed by the data in the booklet n ° 70 of the General Technical Specifications applicable to public works contracts voted by decree n ° 92-72 of 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 compared to the excavation width in accordance with the specifications of booklet no. 70.
- the stops are plates, preferably metallic, which have a light opening at the bottom of the plate, oriented towards the bottom of the trench, the width of said light corresponding substantially to the outside diameter of the pipe elements.
- the bottom of the lumen is semi-circular in shape and has a diameter substantially corresponding to the outside diameter of the pipe elements. The height of the light is greater than the outside diameter of the pipe elements.
- the spacing between the stops is determined according to the characteristics of the pipe elements, namely inside diameter, outside diameter and density, and according to the weight of each stop.
- the reaction exerted on each stopper is at least equal to the difference between the Archimedes thrust exerted by the thixotropic material on the pipe elements and the weight of said pipe elements.
- the backfilling of the trench is then carried out in one or more times up to the road reconstruction base.
- the backfill material must be poured into the trench to a minimum height previously determined by a theoretical calculation.
- Archimedes' thrust expressed in kg / ml (kilogram per linear meter) is the product of the volume displaced by the density of the fill material.
- the weight of the pipe being known, the wetted section for which there is equilibrium between the buoyancy and the weight of the pipe is the ratio of the pipe to the density of the fill material.
- the beta coefficient is the ratio of the wetted section to the square of 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 equilibrium between the weight of the pipe and the buoyancy. The stop to be exercised, if the pipe is flooded, is equal to the difference between the buoyancy and the weight of the pipe.
- the minimum quantity of backfill material to be used during the first backfill step is such that the height reached is greater than the equilibrium height calculated as explained above.
- the pipes are submerged up to the upper generator of the pipe.
- the backfilling of the trench is compartmentalized by the stops; it is therefore carried out in several stages.
- the last portion of non-backfilled pipes can curve without dislocation.
- the joints between pipes allow only an angle of 4 ° without dislocation; it is therefore necessary to check that the reservation under the pipe does not exceed, for example 17 cm for a 2.4 m hose and 20 cm for a 3 m hose.
- the pipe goes up to the stops under the effect of the Archimedes' push exerted by the backfill material.
- An additional backfill is possibly carried out with the thixotropic material up to the base of reconstitution of the roadway.
- the thixotropic material can be a concrete comprising: aggregates with a maximum diameter of less than 20 mm, for example silico-aluminous fly ash, a binder representing 2 to 6% of the dry weight of the aggregates, a hydro-reducing agent, for example natural or synthetic fibers, in particular acrylic polymer fibers, representing 0.05 to 0.15% of the dry weight of the aggregates.
- the water / cement ratio of this concrete is of the order of 5 to 12.
- the thixotropic material according to the invention advantageously comprising aggregates consisting of silico-aluminous fly ash ensures excellent sealing of the assembly formed by the pipe and said thixotropic material.
- 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 hours and a resistance over time (measured according to standard NF-P98-232.1) of the order 1 MPa, after final setting.
- the thixotropic material according to the present invention hardens in about 2 hours.
- PVC pipes have an outside diameter of 400 mm.
- the depth of the trench is 1.20 m.
- 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 roadway 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 / 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 5 cm thick wearing course.
- the method 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 base layer of the pavement, and 95 kg / ml of asphalt for the wearing course, that is to say a material saving of between 55 and 60%.
- Example 2 90A concrete pipe laying
- the 90A concrete pipes have an outside diameter of 500 mm.
- the depth of the trench is 2.50 m. Shielding is mandatory.
- 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 roadway 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 that includes the armor is the width of the trench that includes the armor.
- 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 restoration 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 foundation layers of the roadway, 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)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98902075A EP1007795B1 (en) | 1997-01-16 | 1998-01-14 | Method for fitting pipes |
CA002278224A CA2278224C (en) | 1997-01-16 | 1998-01-14 | Method for fitting pipes |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR97/00395 | 1997-01-16 | ||
FR9700395A FR2758378B1 (en) | 1997-01-16 | 1997-01-16 | PIPE LAYING PROCESS |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998031880A1 true WO1998031880A1 (en) | 1998-07-23 |
Family
ID=9502648
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR1998/000060 WO1998031880A1 (en) | 1997-01-16 | 1998-01-14 | Method for fitting pipes |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP1007795B1 (en) |
CA (1) | CA2278224C (en) |
CZ (1) | CZ297610B6 (en) |
ES (1) | ES2173566T3 (en) |
FR (1) | FR2758378B1 (en) |
WO (1) | WO1998031880A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2830269B1 (en) | 2001-09-28 | 2004-07-09 | Eurovia Man | PROCESS FOR PREPARING A SELF-COMPACTING FILL, SELF-COMPACTING FILL AND THE USE THEREOF |
FR2851316B1 (en) * | 2003-02-13 | 2007-04-20 | Gaz De France | METHOD FOR INSTALLATION OF TUBULAR BLEEDING ELEMENTS AND PREPARATION OF MORTAR FOR ITS IMPLEMENTATION |
BE1021367B1 (en) * | 2013-02-06 | 2015-11-06 | Etablissements Hublet | REEXCAVABLE AUTOCOMPACTANT FILLER. |
FR3101648B1 (en) | 2019-10-04 | 2021-11-26 | Greffet | Ditch cleaner device with special technology for capturing and lifting all types and constituents of soil and sludge, adaptable to a tractor with a maximum power of 100hp for use on narrow and winding roads. |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1392931A (en) * | 1971-08-14 | 1975-05-07 | Holroyd L M | Laying of pipes |
US3993192A (en) * | 1975-11-10 | 1976-11-23 | Christopher Brian Bunn | Pipeline weight container and method |
US3994139A (en) * | 1974-08-01 | 1976-11-30 | Gewerkschaft Eisenhutte Westfalia | Apparatus for and a method of laying a pipe line |
DE2905146A1 (en) * | 1979-02-10 | 1980-08-21 | Rolf Stahn | Buried pipe and conduit laying - using concrete around pipe on trench bottom and fill of bentonite or stopper suspension |
US4329083A (en) * | 1977-01-26 | 1982-05-11 | Societe Soletanche | Methods of laying underground conduits |
US4836595A (en) * | 1988-05-05 | 1989-06-06 | Dicarlo Frank | Pipe handling apparatus |
GB2247507A (en) * | 1990-08-30 | 1992-03-04 | Seamark Systems | Subsea pipe protection and insulation |
-
1997
- 1997-01-16 FR FR9700395A patent/FR2758378B1/en not_active Expired - Lifetime
-
1998
- 1998-01-14 EP EP98902075A patent/EP1007795B1/en not_active Expired - Lifetime
- 1998-01-14 WO PCT/FR1998/000060 patent/WO1998031880A1/en active IP Right Grant
- 1998-01-14 ES ES98902075T patent/ES2173566T3/en not_active Expired - Lifetime
- 1998-01-14 CA CA002278224A patent/CA2278224C/en not_active Expired - Lifetime
- 1998-01-14 CZ CZ0250699A patent/CZ297610B6/en not_active IP Right Cessation
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1392931A (en) * | 1971-08-14 | 1975-05-07 | Holroyd L M | Laying of pipes |
US3994139A (en) * | 1974-08-01 | 1976-11-30 | Gewerkschaft Eisenhutte Westfalia | Apparatus for and a method of laying a pipe line |
US3993192A (en) * | 1975-11-10 | 1976-11-23 | Christopher Brian Bunn | Pipeline weight container and method |
US4329083A (en) * | 1977-01-26 | 1982-05-11 | Societe Soletanche | Methods of laying underground conduits |
DE2905146A1 (en) * | 1979-02-10 | 1980-08-21 | Rolf Stahn | Buried pipe and conduit laying - using concrete around pipe on trench bottom and fill of bentonite or stopper suspension |
US4836595A (en) * | 1988-05-05 | 1989-06-06 | Dicarlo Frank | Pipe handling apparatus |
GB2247507A (en) * | 1990-08-30 | 1992-03-04 | Seamark Systems | Subsea pipe protection and insulation |
Also Published As
Publication number | Publication date |
---|---|
CZ9902506A3 (en) | 2001-01-17 |
EP1007795B1 (en) | 2002-04-24 |
EP1007795A1 (en) | 2000-06-14 |
ES2173566T3 (en) | 2002-10-16 |
FR2758378A1 (en) | 1998-07-17 |
FR2758378B1 (en) | 1999-04-02 |
CA2278224C (en) | 2005-03-29 |
CZ297610B6 (en) | 2007-02-14 |
CA2278224A1 (en) | 1998-07-23 |
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