CN110397793B - Method for installing pipeline in cofferdam area - Google Patents
Method for installing pipeline in cofferdam area Download PDFInfo
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- CN110397793B CN110397793B CN201910716295.5A CN201910716295A CN110397793B CN 110397793 B CN110397793 B CN 110397793B CN 201910716295 A CN201910716295 A CN 201910716295A CN 110397793 B CN110397793 B CN 110397793B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
- F16L1/12—Laying or reclaiming pipes on or under water
- F16L1/16—Laying or reclaiming pipes on or under water on the bottom
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Abstract
The invention provides a method for installing pipelines in a cofferdam area, which comprises the following steps that firstly, a cofferdam is constructed by a silt operation ship; secondly, a slope is manufactured on the land side, one end of the submarine pipeline penetrates through a cofferdam and a dam, and the scaffold platform and the crane are located in a cofferdam area; thirdly, connecting the submarine pipeline with the bent section of the inclined riser in the cofferdam area; fourthly, connecting the lower bending section of the inclined vertical pipe with the upper bending section of the inclined vertical pipe in the cofferdam area; fifthly, mounting a blind flange on the elbow section of the upper bending section of the inclined vertical pipe in the cofferdam area; sixthly, backfilling and protecting the installation part of the submarine pipeline to restore the landform; the pretreatment process of submarine pipeline landing operation is reduced, operation ships are avoided, the construction cost is reduced, and the pipeline landing operation is safe and reliable.
Description
Technical Field
The invention relates to a submarine pipeline laying technology, in particular to a pipeline installation method in a cofferdam area.
Background
In recent years, as the number of pipeline laying operations increases, the number of pipeline landing operations also increases. The traditional login and dragging mode is as follows: the pipeline is hauled by a linear winch on the landing side to haul the pipeline to a land location. The disadvantage of this method is that when the elevation difference of the landing position of the pipeline is large (the elevation difference is the height difference between the seabed and the land), the pretreatment workload on the landing side is large, the project construction period is prolonged, and the project cost is increased.
Disclosure of Invention
The invention mainly aims to overcome the defects of the existing construction method, and provides a pipeline installation method in a cofferdam area, which reduces the pretreatment process of submarine pipeline landing operation, avoids using operation ships, reduces the construction cost and ensures that the pipeline landing operation is safe and reliable.
The purpose of the invention is realized by the following technical scheme.
The method for installing the pipeline in the cofferdam area is characterized by comprising the following steps of:
firstly, a sediment working ship is anchored at a designed position, geotextile is pre-arranged at a position 50-60 meters away from the slope bottom of a land side slope, the sediment working ship is connected with the geotextile through a sediment conveying hose, the sediment working ship and the sediment conveying hose inject sediment into the geotextile, after the geotextile is filled with the sediment, the geotextile is sequentially stacked into a cofferdam dam with a trapezoidal longitudinal section, and two ends of the cofferdam dam are propped against two sides of the land side slope to form a cofferdam area;
secondly, leveling the surface of a land side slope and manufacturing a slope, wherein one end of a submarine pipeline penetrates through a cofferdam in a dragging operation mode, and a scaffold platform and a crane are in place in a cofferdam area;
thirdly, connecting one end of the submarine pipeline in a cofferdam area penetrated by the outer side of the cofferdam with the elbow end of the downward bending section of the inclined riser in the cofferdam area;
fourthly, connecting the tail end of the straight pipe section of the downward bent section of the inclined vertical pipe with one end of the straight pipe section of the upward bent section of the inclined vertical pipe in the cofferdam area;
fifthly, mounting a blind flange on an elbow section at one end of the upper bending section of the inclined vertical pipe, which is far away from the lower bending section of the inclined vertical pipe, in the cofferdam area;
and sixthly, carrying out silt backfilling operation, and backfilling and protecting the installation part of the submarine pipeline to finish landform restoration operation.
The method of installing a pipeline in a cofferdam area as described above, wherein,
firstly, positioning a silt operating ship at a position of 100 +/-20 meters outside a cofferdam area; pre-arranging geotextile according to the position of a cofferdam; the silt operation ship conveys silt to the geotextile through a silt conveying hose, the geotextile filled with silt is sequentially stacked up and down to form a cofferdam dam with a trapezoidal longitudinal section, and two ends of the cofferdam dam are propped against two sides of a land side slope to form a cofferdam area; the height of the trapezoid cofferdam is 5 to 6 meters, the width of the upper end is 9 to 12 meters, the width of the lower end is 15 to 20 meters, and the length is 60 to 80 meters; after the cofferdam operation is completed by the silt operating ship, removing seawater in the cofferdam area to the outer side of the cofferdam by a water pump to form a dry operating environment in the cofferdam area;
secondly, preprocessing the slope on the land side, and flattening the slope surface to ensure that the crane safely enters a construction site; meanwhile, the included angle between the land side slope and the sea level is ensured to be 15-20 degrees; determining the angle of an elbow of a lower bent section of the inclined vertical pipe to be 180 degrees minus the degree of an included angle between the land side slope and the sea level according to the slope angle; one end of the submarine pipeline enters the cofferdam area in a dragging mode, the scaffold platform is positioned at the tail end of one end of the submarine pipeline, which is positioned in the cofferdam area, and the crane is positioned at the construction position in the cofferdam area;
firstly, buckling a steel wire rope and a reverse chain on a pipe body of the downward bending section of the inclined vertical pipe, and adjusting the position of the downward bending section of the inclined vertical pipe by adjusting the length of the reverse chain to realize that the straight pipe section of the downward bending section of the inclined vertical pipe is parallel to the slope surface of the land side; then, adjusting a crane to lower the downward bent section of the inclined riser, axially aligning the bent section of the downward bent section of the inclined riser and one end of the submarine pipeline, which is positioned in the cofferdam area, completing the assembly operation of the bent section of the downward bent section of the inclined riser and the submarine pipeline, and then performing welding operation on a scaffold platform;
fixing the downward bent section of the inclined vertical pipe on the slope on the land side, moving the scaffold platform to the tail end of the straight pipe section of the downward bent section of the inclined vertical pipe, adjusting the position of the crane, and lowering the upward bent section of the inclined vertical pipe by adjusting the steel wire rope and the inverted chain to enable the slope surface of the straight pipe section of the upward bent section of the inclined vertical pipe and the slope on the land side to be parallel at the position above the tail end of the straight pipe section of the downward bent section of the inclined vertical pipe; then adjusting the crane, lowering the upward bending section of the inclined vertical pipe, axially aligning the two pipe ends of the upward bending section of the inclined vertical pipe and the downward bending section of the inclined vertical pipe, completing the assembly operation of the pipe ends of the upward bending section of the inclined vertical pipe and the downward bending section of the inclined vertical pipe, and finally performing welding operation on a scaffold platform at the joint of the two pipe ends of the upward bending section of the inclined vertical pipe and the downward bending section of the inclined vertical pipe;
fifthly, mounting a blind flange on an elbow section at one end of the upper bent section of the inclined vertical pipe, which is far away from the lower bent section of the inclined vertical pipe, in the cofferdam area so as to protect the elbow section at one end of the upper bent section of the inclined vertical pipe, so that sundries are prevented from entering the pipe end of the upper bent section of the inclined vertical pipe, and the subsequent land pipeline construction is facilitated;
and sixthly, after the welding operation of the two inclined vertical pipes is completed, performing coarse sand and original soil layer backfilling operation on the lower bent section of the inclined vertical pipe, the upper bent section of the inclined vertical pipe and the operation area of the submarine pipeline, protecting the submarine pipeline, and recovering the original appearance of the land side.
The method for installing the pipeline in the cofferdam area has the beneficial effects that: by combining the high-rise characteristic of the landing side and adopting the landing method of installing the inclined vertical pipe in the cofferdam area, the pretreatment process of the landing position is reduced, the use of operation ships is avoided, the construction cost is reduced, and the safe landing operation of the pipeline is realized.
Drawings
Fig. 1 is an overall structure and layout of the cofferdam of the present invention.
Fig. 1A is a top view of a cofferdam structure of the present invention.
Fig. 1B is a longitudinal cross-sectional view of the cofferdam structure of the present invention.
Fig. 2 is a drawing of a crane, scaffold platform, subsea pipeline alignment of the present invention.
FIG. 3 is a drawing of the hoisting of the lower bent section of the inclined riser pipe according to the present invention.
FIG. 4 is a view of the lowering landing position of the downpipe bend of the invention.
FIG. 5 is a view of the upward bending section of the inclined vertical pipe lifted by the crane of the present invention.
FIG. 6 shows the upper bent section of the inclined vertical pipe with the crane lowered into position.
FIG. 7 is a blind flange mounting diagram of the mounting end of the inclined riser pipe.
The main reference numbers in the figures illustrate: 11 silt working ships, 12 geotextiles, 13 silt conveying hoses, 2 cofferdam dams, 21 cofferdam heights, 22 cofferdam upper end widths, 23 cofferdam lower end widths, 3 land side slopes, 4 submarine pipelines, 41 inclined riser downward bent sections, 42 inclined riser upward bent sections, 5 scaffold platforms, 6 cranes, 71 steel wire ropes, 72 inverted chains, 8 blind plates, and included angles between the land side slopes (3) A and the sea level.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
The invention relates to a method for installing a pipeline in a cofferdam area, which comprises the following steps:
firstly, a sediment working ship 11 is anchored at a designed position, geotextile 12 is pre-arranged at a position 50-60 meters away from the slope bottom of a land side slope, the sediment working ship 11 is connected with the geotextile 12 through a sediment conveying hose 13, the sediment working ship 11 and the sediment conveying hose 13 inject sediment into the geotextile 12, after the geotextile 12 is filled with the sediment, the geotextile 12 is sequentially stacked into a cofferdam dyke 2 with a trapezoidal longitudinal section, and two ends of the cofferdam dyke 2 are propped against two sides of the land side slope to form a cofferdam area;
secondly, leveling the surface of the land side slope 3 and manufacturing a slope, wherein one end of a submarine pipeline 4 penetrates through a cofferdam 2 in a dragging operation mode, and a scaffold platform 5 and a crane 6 are positioned in a cofferdam area;
thirdly, connecting one end of the submarine pipeline 4 in a cofferdam area penetrated by the outer side of the cofferdam 2 with the elbow end of the downward bent section 41 of the inclined riser in the cofferdam area;
fourthly, connecting the tail end of the straight pipe section of the inclined riser lower bent section 41 with one end of the straight pipe section of the inclined riser upper bent section 42 in the cofferdam area;
fifthly, mounting a blind flange 8 on an elbow section at one end of the upper bent section 42 of the inclined riser, which is far away from the lower bent section 41 of the inclined riser, in the cofferdam area;
and sixthly, carrying out silt backfilling operation, and backfilling and protecting the installation part of the submarine pipeline 4 to finish landform restoration operation.
The invention relates to a method for installing pipelines in a cofferdam area, which comprises the following steps:
firstly, positioning a silt operating ship 11 at a position of 100 +/-20 meters outside a cofferdam area; the geotextile 12 is pre-arranged according to the position of the cofferdam dam 2; the silt operation ship 11 conveys silt to the geotextile 12 through a silt conveying hose 13, the geotextile 12 filled with silt is sequentially stacked up and down to form a cofferdam 2 with a trapezoidal longitudinal section, and two ends of the cofferdam 2 are propped against two sides of a land side slope to form a cofferdam area; the height of the trapezoid cofferdam 2 is 5 to 6 meters, the width of the upper end is 9 to 12 meters, the width of the lower end is 15 to 20 meters, and the length is 60 to 80 meters; after the silt operating ship 11 finishes cofferdam operation, the seawater in the cofferdam area is removed to the outer side of the cofferdam 2 through a water pump, and a dry operating environment in the cofferdam area is formed, as shown in fig. 1, 1A and 1B;
secondly, preprocessing the land side slope 3, and flattening the slope surface to realize that the crane safely enters a construction site; meanwhile, an included angle A between the land side slope 3 and the sea level is ensured to be 15-20 degrees; determining the angle of the elbow of the lower bent section 41 of the inclined vertical pipe to be 180 degrees minus the degree of an included angle between the land side slope 3 and the sea level according to the slope angle; one end of the submarine pipeline 4 enters the cofferdam area in a dragging mode, the scaffold platform 5 is positioned at the tail end of one end of the submarine pipeline 4 in the cofferdam area, and the crane 6 is positioned at the construction position in the cofferdam area, as shown in figure 2;
thirdly, firstly, buckling a steel wire rope 71 and a chain block 72 on the pipe body of the lower bent section 41 of the inclined riser, and adjusting the position of the lower bent section 41 of the inclined riser by adjusting the length of the chain block 72 to realize that the straight pipe section of the lower bent section 41 of the inclined riser is parallel to the slope surface of the land side slope 3, as shown in fig. 3; then, adjusting the crane 6 to lower the bent section 41 of the inclined riser, so as to axially align the bent section 41 of the inclined riser with one end of the submarine pipeline 4 in the cofferdam area, completing the assembly operation of the bent section 41 of the inclined riser and the submarine pipeline 4, and then performing the welding operation on the scaffold platform 5, as shown in fig. 4;
fourthly, fixing the lower bent section 41 of the inclined vertical pipe on the land side slope 3, moving the scaffold platform 5 to the tail end of the straight pipe section of the lower bent section 41 of the inclined vertical pipe, adjusting the position of the crane 6, and lowering the upper bent section 42 of the inclined vertical pipe by adjusting the steel wire rope 71 and the chain block 72 so that the straight pipe section of the upper bent section 42 of the inclined vertical pipe and the slope surface of the land side slope 3 at the position above the straight pipe section of the lower bent section 41 of the inclined vertical pipe are parallel, as shown in fig. 5; then adjusting the crane 6, lowering the upward bent section 42 of the inclined riser to axially align the two pipe ends of the upward bent section 42 of the inclined riser and the straight pipe section of the downward bent section 41 of the inclined riser, completing the assembly operation of the pipe ends of the upward bent section 42 of the inclined riser and the straight pipe section of the downward bent section 41 of the inclined riser, and finally performing welding operation on the scaffold platform 5 at the joint of the two pipe ends of the upward bent section 42 of the inclined riser and the straight pipe section of the downward bent section 41 of the inclined riser, as shown in fig. 6;
fifthly, mounting a blind flange 8 on an elbow section at one end of the upper bent section 42 of the inclined vertical pipe, which is far away from the lower bent section 41 of the inclined vertical pipe, in the cofferdam area so as to protect the elbow section at one end of the upper bent section 42 of the inclined vertical pipe from entering sundries from the pipe end of the upper bent section 42 of the inclined vertical pipe, and facilitating subsequent land pipeline construction, as shown in fig. 7;
and sixthly, after the welding operation of the two inclined vertical pipes is completed, performing coarse sand and original soil layer backfilling operation on the lower bent section 41 of the inclined vertical pipe, the upper bent section 42 of the inclined vertical pipe and the operation area of the submarine pipeline 4, protecting the submarine pipeline 4, and recovering the original appearance of the land side.
The content not described in this embodiment is the prior art, and thus is not described again.
The method for installing the pipeline in the cofferdam area has the advantages that: through cofferdams, a waterless operation environment is manufactured in a construction area, and the crane is located in the waterless environment; one end of the submarine pipeline enters the cofferdam area in a dragging mode, and is welded with the submarine pipeline in an assembling mode by means of the downward bent section of the inclined vertical pipe and the upward bent section of the downward bent section of the inclined vertical pipe under the cooperation of a crane, so that operation ships are avoided, the construction cost is reduced, and the safe landing operation of the pipeline is realized.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications, equivalent variations and modifications made to the above embodiment according to the technical spirit of the present invention still fall within the scope of the technical solution of the present invention.
Claims (2)
1. A method of installing a pipeline in a cofferdam area, comprising the steps of:
firstly, a sediment work boat (11) is anchored at a designed position, geotextile (12) is pre-arranged at a position 50-60 meters away from the slope bottom of a land side slope, the sediment work boat (11) is connected with the geotextile (12) through a sediment conveying hose (13), the sediment work boat (11) and the sediment conveying hose (13) inject sediment into the geotextile (12), after the geotextile (12) is filled with the sediment, the geotextile is sequentially stacked into a cofferdam (2) with a trapezoidal longitudinal section, and two ends of the cofferdam (2) are propped against two sides of the land side slope to form a cofferdam area;
secondly, leveling the surface of the land side slope (3) and manufacturing a slope, wherein one end of the submarine pipeline (4) penetrates through the cofferdam (2) in a dragging operation mode, and the scaffold platform (5) and the crane (6) are positioned in the cofferdam area;
thirdly, connecting one end of the submarine pipeline (4) in a cofferdam area penetrated from the outer side of the cofferdam (2) with the elbow end of the downward bending section (41) of the inclined stand pipe in the cofferdam area;
fourthly, connecting the tail end of the straight pipe section of the downward bent section (41) of the inclined riser with one end of the straight pipe section of the upward bent section (42) of the inclined riser in the cofferdam area;
fifthly, mounting a blind flange (8) on an elbow section at one end of the upper bending section (42) of the inclined vertical pipe, which is far away from the lower bending section (41) of the inclined vertical pipe, in the cofferdam area;
and sixthly, carrying out silt backfilling operation, and backfilling and protecting the installation part of the submarine pipeline (4) to finish landform restoration operation.
2. A method of piping installation in a cofferdam area according to claim 1,
firstly, positioning a silt operating ship (11) at a position of 100 +/-20 meters outside a cofferdam area; the geotextile (12) is pre-arranged according to the position of the cofferdam dam (2); the silt operation ship (11) conveys silt to the geotextile (12) through a silt conveying hose (13), the geotextile (12) filled with silt is sequentially stacked up and down to form a cofferdam dam (2) with a trapezoidal longitudinal section, and two ends of the cofferdam (2) are propped against two sides of a land side slope to form a cofferdam area;
the height of the trapezoid cofferdam (2) is 5-6 meters, the width of the upper end is 9-12 meters, the width of the lower end is 15-20 meters, and the length is 60-80 meters;
after the silt operation ship (11) finishes cofferdam operation, removing seawater in the cofferdam area to the outer side of the cofferdam (2) through a water pump to form a dry operation environment in the cofferdam area;
secondly, preprocessing a land side slope (3) to level the slope surface, so that the crane can safely enter a construction site; meanwhile, an included angle (A) between the land side slope (3) and the sea level is ensured to be 15-20 degrees; determining the elbow angle of the lower bending section (41) of the inclined vertical pipe to be 180 degrees minus the included angle degree between the slope (3) and the sea level according to the slope angle; one end of the submarine pipeline (4) enters the cofferdam area in a dragging mode, the scaffold platform (5) is positioned at the tail end of one end of the submarine pipeline (4) in the cofferdam area, and the crane (6) is positioned at the construction position in the cofferdam area;
thirdly, firstly, buckling a steel wire rope (71) and a chain block (72) on a pipe body of the inclined riser downward bending section (41), and adjusting the position of the inclined riser downward bending section (41) by adjusting the length of the chain block (72) to realize that the straight pipe section of the inclined riser downward bending section (41) is parallel to the slope surface of the land side slope (3); then, adjusting a crane (6) to lower the bent section (41) of the inclined riser, axially aligning the bent section of the bent section (41) of the inclined riser with one end of the submarine pipeline (4) in the cofferdam area, completing the assembly operation of the bent section (41) of the inclined riser and the submarine pipeline (4), and then performing welding operation on the scaffold platform (5);
fixing the lower bent section (41) of the inclined vertical pipe on the land side slope (3), moving the scaffold platform (5) to the tail end of the straight pipe section of the lower bent section (41) of the inclined vertical pipe, adjusting the position of the crane (6), and lowering the upper bent section (42) of the inclined vertical pipe by adjusting the steel wire rope (71) and the chain block (72) so that the slope of the straight pipe section of the upper bent section (42) of the inclined vertical pipe and the land side slope (3) at the position above the tail end of the straight pipe section of the lower bent section (41) of the inclined vertical pipe are parallel; then adjusting a crane (6), lowering an upward bent section (42) of the inclined vertical pipe to axially align two pipe ends of the upward bent section (42) of the inclined vertical pipe and the downward bent section (41) of the inclined vertical pipe, completing the assembly operation of the pipe ends of the upward bent section (42) of the inclined vertical pipe and the downward bent section (41) of the inclined vertical pipe, and finally performing welding operation on a scaffold platform (5) at the joint of the two pipe ends of the upward bent section (42) of the inclined vertical pipe and the downward bent section (41) of the inclined vertical pipe;
fifthly, mounting a blind flange (8) on an elbow section at one end of the upper bent section (42) of the inclined vertical pipe, which is away from the lower bent section (41) of the inclined vertical pipe, in the cofferdam area so as to protect the elbow section at one end of the upper bent section (42) of the inclined vertical pipe and prevent the pipe end of the upper bent section (42) of the inclined vertical pipe from entering sundries, thereby facilitating subsequent land pipeline construction;
and sixthly, after the welding operation of the two inclined vertical pipes is completed, performing coarse sand and original soil layer backfilling operation on the lower bent section (41) of the inclined vertical pipe, the upper bent section (42) of the inclined vertical pipe and the operation area of the submarine pipeline (4), protecting the submarine pipeline (4), and recovering the original appearance of the land side.
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| CN1290829A (en) * | 2000-11-14 | 2001-04-11 | 胜利石油管理局工程建设一公司三分公司 | Pipe dragging method and special device for seashore landing pipeline |
| CA2632406C (en) * | 2008-05-28 | 2015-09-08 | Todd Mcbride | Shiftable fluid diversion conduit |
| CN103123017A (en) * | 2012-11-23 | 2013-05-29 | 上海市基础工程有限公司 | Shallow sea long-distance submarine pipeline tension-free laying construction technology |
| CN104727325B (en) * | 2015-02-12 | 2016-08-17 | 宁波高新区围海工程技术开发有限公司 | A kind of method of construction of polder sea wall |
| CN105387274B (en) * | 2015-11-24 | 2017-09-22 | 湖南大麓科技有限公司 | A kind of underground utilities repair householder method, apparatus and system |
| CN106015737B (en) * | 2016-06-14 | 2018-03-23 | 中国葛洲坝集团第一工程有限公司 | The construction method of cross a river immersed tube integral installation |
| CN206512729U (en) * | 2016-12-05 | 2017-09-22 | 中国电建集团华东勘测设计研究院有限公司 | The stable big sand pocket cofferdam structure of ship type on soft soil foundation |
| CN109184559A (en) * | 2018-09-17 | 2019-01-11 | 海洋石油工程股份有限公司 | The login method of submarine pipeline |
| CN109780325B (en) * | 2018-12-17 | 2020-07-28 | 中铁广州工程局集团有限公司 | Installation method of underwater pipeline of water taking tunnel of water plant |
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