CN210216519U - Submarine pipeline landing section interval type soil body liquefaction resistance improving device - Google Patents
Submarine pipeline landing section interval type soil body liquefaction resistance improving device Download PDFInfo
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- CN210216519U CN210216519U CN201920921730.3U CN201920921730U CN210216519U CN 210216519 U CN210216519 U CN 210216519U CN 201920921730 U CN201920921730 U CN 201920921730U CN 210216519 U CN210216519 U CN 210216519U
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Abstract
The utility model discloses an anti liquefaction ability hoisting device of submarine pipeline landing segment interval formula soil body, including the soil body weight unit, wave power dispersion unit and supplementary drainage unit, wherein: the soil body overlapping unit comprises an overlapping base arranged in the pipe ditch and a temporary overlapping body arranged above the overlapping base; the wave force dispersion unit comprises an arc-shaped base plate arranged in the backfill soil of the pipe trench; the auxiliary drainage unit comprises drainage sleeves arranged on two sides of the soil body covering unit and backfilling gravels arranged in the drainage sleeves. The utility model can strengthen the soil body section by section and compact the soil body by improving the soil body weight load; an auxiliary drainage unit is arranged to reduce sand gaps and promote sandy soil drainage; meanwhile, the wave force dispersing unit arranged at the upper part of the backfilled pipeline is used for further enhancing the liquefaction resistance of a sand layer on the pipeline route at the landing section of the submarine pipeline, improving the stability of the soil body at the landing section of the submarine pipeline and ensuring the operation safety of the pipeline.
Description
Technical Field
The utility model relates to an anti liquefaction ability hoisting device of submarine pipeline landing segment interval formula soil body.
Background
With the rapid development of the field of marine oil and gas, the research on the safety guarantee problem of submarine pipelines is increasingly promoted. The stability of the submarine pipeline is a key index influencing the safe production of the submarine pipeline, and the aim of ensuring the stability of the submarine pipeline is continuously pursued under the influence of various environmental loads, functional loads and accidental loads. The settlement of the submarine pipeline is the key point of the stability research of the submarine pipeline and is also the difficulty of the pipe-soil coupling analysis of the submarine pipeline. The main factors inducing the submarine pipeline to settle include initial settlement caused by the self weight of the pipeline, secondary settlement caused by pressure test of the pipeline or filling of media after operation and later settlement caused by liquefaction of soil. Wherein, the inducers of the first two types of settlement are continuous loads, and the inducers of the latter type of settlement are periodic loads. The cyclic loading includes wave action and seismic action. For a submarine pipeline landing section taking sandy soil as a main soil body, a shallow foundation is in a saturated state, and under the action of continuous flapping of sea waves and additional load of an installation pipeline, the problems of volume compression, structural damage, sudden rising of water pressure of gaps and the like of the soil body can be caused, and the phenomena of sand boiling, flow slip and the like are represented. Receive pipeline body, counter weight and fill the influence of dress medium, after the soil body liquefaction, the pipeline will probably take place the large tracts of land and subside, appear bending on a large scale and unsettled, promote its strength destruction and fatigue failure probability by a wide margin, await urgent need to control.
At present, aiming at the problem of liquefaction of a submarine pipeline soil body, liquefaction possibility evaluation is mainly carried out through early evaluation, for a soil body section with liquefaction possibility, the proposed measures for enhancing the liquefaction resistance of the soil body comprise soil body replacement and filling, soil body encryption and the like, the soil body condition is improved by replacing sand with liquefaction potential with stable clay or discharging saturated water in the sand, and the liquefaction possibility is reduced. Meanwhile, a scheme of embedding the branch piles of the deeper pipeline is also provided, and pipeline support is provided by embedding the branch piles with deeper foundations on the pipeline route. However, although the principle of the above scheme and measures is clear, the actual operation in ocean engineering is difficult, and the investment is high: the soil body is replaced and filled in pipelines with deeper liquefied sand layers, and the replacement and filling amount is extremely large; if the liquefaction risk section full-line soil body encryption is adopted, the workload is large, and the offshore operation difficulty is high; for the idea of pre-buried pipeline branch piles, the problem of large engineering investment also exists due to the fact that the required depth of foundation piles is large. Therefore, a scheme for improving the liquefaction resistance of a soil body, which is convenient to construct, low in cost and good in effect, is urgently needed to be provided, so that the scheme is applied to a submarine pipeline landing section mainly comprising sandy soil.
Disclosure of Invention
In order to overcome prior art's shortcoming, the utility model provides an anti liquefaction ability hoisting device of submarine pipeline landing section interval formula soil body, based on the liquefaction failure mechanism of wave to saturated sandy soil landing section, from increasing the upper portion weight, improve and promote multi-angle such as pipeline below local soil body closely knit degree and dispersion wave load and start, promote landing section submarine pipeline stability to further perfect, enrich submarine pipeline landing section stability technical control technique.
The utility model adopts the technical proposal that: the utility model provides a submarine pipeline lands section interval formula soil body anti liquefaction ability hoisting device, includes that the soil body covers heavy unit, wave power dispersion unit and supplementary drainage unit, wherein: the soil body overlapping unit comprises an overlapping base arranged in the pipe ditch and a temporary overlapping body arranged above the overlapping base; the wave force dispersion unit comprises an arc-shaped base plate arranged in the backfill soil of the pipe trench; the auxiliary drainage unit comprises drainage sleeves arranged on two sides of the soil body covering unit and backfilling gravels arranged in the drainage sleeves.
Compared with the prior art, the utility model has the positive effects that:
the utility model improves the stress and compactness of the soil body by the action of the soil body covering unit on the original soil body, and simultaneously relieves the upwelling of water flow below the pipeline during liquefaction; the pipeline supporting unit provides flexible support for the submarine pipeline, and the vibration influence of the pipeline operation on the soil body is relieved; the wave force dispersing unit disperses the wave force at the top and the side upper part of the pipeline and deviates from the projection position of the pipeline, so that the disturbance of the soil body right below the pipeline is further reduced; the auxiliary drainage unit is used for arranging gravels with larger particle sizes on two sides of the pipe ditch to communicate the seabed with the bottom area of the pipe ditch, so that the liquefied water flow drainage effect is achieved. Finally, by means of the series of measures, the soil compactness of the position where the pipeline is located is improved to a certain extent, the risk of soil liquefaction under the action of wave force is reduced, and the stability of the submarine pipeline at the landing section is improved.
The utility model is based on the liquefaction failure mechanism of waves to the saturated sandy soil landing section, and considers that the soil body is reinforced and compacted by sections by improving the soil body weight load on the basis of the prior pipeline liquefaction risk processing technology; an auxiliary drainage unit is arranged to reduce sand gaps and promote sandy soil drainage; meanwhile, the wave force dispersing unit arranged at the upper part of the backfilled pipeline is used for further enhancing the liquefaction resistance of a sand layer on the pipeline route at the landing section of the submarine pipeline, improving the stability of the soil body at the landing section of the submarine pipeline and ensuring the operation safety of the pipeline.
The utility model is suitable for an use submarine pipeline landing section that sand soil property is given first place to. The system has the advantages of clear principle, convenient installation, environmental protection and energy conservation, and the specific advantages are as follows:
(1) principle is reliable
The utility model discloses from improving the soil body and covering heavily, promoting the inside extrusion of soil body and drainage and setting up multinomial measures such as wave power dispersion devices and set out, improved the regional soil body compactness of pipeline place landing section and improved the periodic loading power of the soil body, further reduced the local liquefaction that the soil body probably takes place because of wave power periodic action, also improved the soil liquefaction resistance that the soil body arouses to the accidental earthquake. And simultaneously, the utility model discloses can carry out the compartment according to the actual pipe diameter of pipeline and arrange to further reduce the investment.
(2) Convenient to install
The utility model discloses the device is prefabricated for the land, and the scene only needs simple hoist and mount, additional processes such as underwater welding, bolted connection, simple to operate, and the later stage does not have the maintenance demand.
(3) Environmental protection and energy saving
The required materials of the utility model are mainly concrete and rubber, and the materials are environment-friendly; and simultaneously, the utility model discloses can remove from and change the huge engineering volume that the engineering method that fills and deep pile strut etc. sandy soil place commonly used on a large scale from.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
fig. 1 is the schematic diagram of the utility model discloses a submarine pipeline landing section interval formula soil body anti liquefaction ability hoisting device.
Detailed Description
A spaced-type soil body liquefaction resistance improving device for a landing section of a submarine pipeline, as shown in fig. 1, comprising: the concrete pile comprises a covering base 1, a temporary upper covering body 2, a rubber cushion layer 3, an arc-shaped concrete plate 4, a drainage sleeve 5, a backfilling gravel 6, a sieve pore 7, a submarine pipeline 8, a pipe ditch 9 and the like.
Wherein:
the overlapping base 1 and the temporary upper overlapping body 2 form a soil overlapping unit of the landing section of the submarine pipeline, and are responsible for overlapping and compacting a semi-disturbed seabed on a central route of the submarine pipeline and providing an installation groove for 8 pipelines of the submarine pipeline.
In particular, the amount of the solvent to be used,
1) the bottom of the covering base 1 is prefabricated with a plurality of cones for embedding into a seabed to cover and compact the seabed which is subjected to semi-disturbance due to excavation; the lateral parts of two sides of the covering base 1 are prefabricated soil body edge compaction wings which are used for carrying out centralized extrusion on sandy soil in the process of embedding the covering base, and hollow channels are pre-opened in the covering base for draining water to two sides; two grooves are prefabricated on the upper portion of the overlapping base 1 and used for placing the temporary upper overlapping body 2.
2) The material of the covering base 1 is concrete, in order to improve the balance weight of the covering base, a steel plate is embedded in the covering base, and the overall strength of the covering base is improved through reinforcing bars;
3) the shape of the covering base 1 is similar to a cuboid flat plate, corners are formed on two sides of the covering base, the covering base is inclined downwards to form a soil body edge compaction wing, and the inclination angle is 30 degrees; the width (upper part) of the covering base 1 is +1.5m of the diameter of the pipeline, the height is 0.3-0.5 m, and the length (along the axial direction of the pipeline) is 2 m; the covering base 1 is provided with a lifting lug at the soil body edge fastening wing for lifting.
4) Two paths of convex grooves are prefabricated at the bottom of the temporary upper repeat body 2 and are used for aligning two paths of concave grooves of the repeat base 1; the temporary upper part repeat body 2 is of a reinforced concrete structure, and lifting lugs are embedded on two sides of the upper part.
5) The width of the temporary upper part repetitive body 2 is +1.5m of the diameter of the pipeline, the height is determined by calculation according to the required load, and the length (along the axial direction of the pipeline) is 2 m; the weight of the temporary upper repeat body is determined according to the soil compaction requirement of the lower part of the pipeline determined by experiments and analysis.
6) A groove for positioning a pipeline is arranged at the center of the upper part of the covering base 1, the depth of the groove is 0.15m, and the width of the groove is determined according to the size of the pipeline; the upper part of the groove is provided with a rubber cushion layer 3 with the thickness of 0.05 m.
Wherein the content of the first and second substances,
the rubber cushion layer 3 forms a submarine pipeline supporting unit and is responsible for providing a submarine pipeline 8 with lateral and vertical support in a locating process and in-place operation, so that the outer surface of the pipeline is prevented from being damaged, and meanwhile, the transmission of self vibration to soil at the lower part and the lateral part in the pipeline operation is realized.
In particular, the amount of the solvent to be used,
1) the rubber cushion layer 3 is connected with the groove wall of the covering base 1 in advance;
2) the rubber cushion layer 3 has a thickness of at least 0.05m and completely covers the groove.
Wherein:
the arc-shaped concrete plates 4 form a wave force dispersing unit which is responsible for dispersing the wave force which is downwards transmitted to the pipeline from the seabed after the pipeline is installed, transmitting the part of wave force to the two sides of the pipeline and compacting the soil body below the pipeline.
In particular, the amount of the solvent to be used,
1) the arc concrete plate 4 is a reinforced concrete arc plate with the thickness of 0.2 m; the width is +2m of the diameter of the pipeline, and the length (along the axial direction of the pipeline) is 2 m;
2) the arc-shaped concrete plate 4 is in an upward convex arc shape, and the integral bending angle is 10-15 degrees;
3) the upper part of the arc-shaped concrete plate 4 is provided with 4 prefabricated lifting lugs.
Wherein:
the drainage casing 5, the backfilling gravel 6 and the like form an auxiliary drainage unit which is used for providing a gap saturated water drainage channel after sand around the pipeline is subjected to external force when the pipe ditch is compact and the pipeline runs.
In particular, the amount of the solvent to be used,
1) the diameter of the drainage sleeve is DN 100-DN 200, the material is plastic PE pipe, and the length is the pipeline burying depth (the sitting bottom depth) +1 m;
2) the drainage sleeve is installed by drilling through a drilling machine; the drainage sleeves are arranged on the left side and the right side of the covering base 1, and the distance between the drainage sleeves and the outer edge of the covering base 1 is 0.3-0.5 m;
3) the drainage sleeve is arranged in the range of 2m at the lower part, a plurality of sieve holes 7 are prefabricated on the wall of the sleeve, and the aperture is 25 mm; after being installed in place, the drainage casing is filled with the backfilling gravel 6, the average grain diameter of the backfilling gravel 6 is 60mm, and a drainage channel for saturated water in the nearby sandy soil is provided while the stability of the gravel body is ensured.
To sum up, constitute a submarine pipeline landing section soil body and resisted liquefaction ability hoisting device, the theory of action does:
the utility model is based on the liquefaction failure mechanism of the wave to the saturated sandy soil landing section, on the basis of the existing pipeline soil replacement backfilling, the pipeline route which generates half disturbance due to the excavation of a pipe ditch 9 is covered and compacted by the discontinuous arrangement of the covering base 1, and the compacting wings at the edge of the soil body are arranged to compact and drain the two sides; the soil body is further compacted by arranging the temporary upper repeat body 2; the rubber cushion layer 3 plays a role in installation protection of the pipeline body and weakening vibration in pipeline operation; by arranging the drainage system, a drainage channel can be effectively provided for saturated water which is transported in sandy soil at the lower part of the pipeline under the action of upper load; through set up wave power dispersion concrete slab above the pipeline, can disperse pipeline top wave load to pipeline both sides. By the aid of the device, principles such as soil body covering, lateral drainage and load dispersion can be fully utilized, soil body liquefaction resistance of a sandy soil geological submarine pipeline landing section is improved, and pipeline production and operation safety is guaranteed economically and efficiently.
When the device is used for improving the liquefaction resistance of interval soil bodies at the landing section of the submarine pipeline, the following steps are adopted:
firstly, evaluating the soil liquefaction potential of a selected routing section of a submarine pipeline landing section according to geological and environmental survey parameters; and (4) for the pipe section with liquefaction risk, namely the soil liquefaction potential index is higher than 1 (the liquefaction resistance requirement is not met), carrying out soil liquefaction resistance improvement treatment.
And secondly, performing soil body liquefaction resistance promotion analysis and experiments, establishing a relation between the earthing load and the soil underwater density and the soil relative density ratio, calculating the corresponding soil underwater density and soil relative density ratio when the soil liquefaction potential is lower than 1 (meeting liquefaction resistance requirements), providing required repeat load, and determining the weight of the repeat base and the temporary upper repeat body based on the parameters.
Thirdly, after pipe ditches are dug in advance at the landing section, a barge is adopted to insert non-metal pipes (with inner sleeves) with lower sieve holes into seabed at the two sides of the overlay base and the pipe ditch digging positions through a drill hole, the insertion depth is more than 1.5m, and gravels with large particle sizes are filled into the non-metal pipes; transporting the weight of the second step to a placing position, and installing; after the installation is finished, a temporary upper repeating body is further installed, and the weight of the temporary upper repeating body is determined according to the soil body compaction requirement of the lower part of the pipeline determined through experiments and analysis.
Fourthly, arranging the devices in the third step along the way according to the interval of 5-10 m/position.
Fifthly, the loading time of the temporary upper part repeating body in the step three is 24 hours, after the loading is finished, the temporary upper part repeating body is removed, a pipeline is installed, and backfilling and soil covering are carried out. And after the soil is filled back to the position 0.5m above the pipeline, horizontally placing a concrete slab into the pipe ditch, and continuously finishing the backfilling.
Claims (10)
1. The utility model provides a submarine pipeline lands section interval formula soil body anti liquefaction ability hoisting device which characterized in that: including soil body weight unit, wave power dispersion unit and supplementary drainage cell, wherein: the soil body overlapping unit comprises an overlapping base arranged in the pipe ditch and a temporary overlapping body arranged above the overlapping base; the wave force dispersion unit comprises an arc-shaped base plate arranged in the backfill soil of the pipe trench; the auxiliary drainage unit comprises drainage sleeves arranged on two sides of the soil body covering unit and backfilling gravels arranged in the drainage sleeves.
2. The spaced soil liquefaction resisting capacity improving device for the landing section of the submarine pipeline according to claim 1, wherein: a groove is formed in the center of the upper portion of the covering base, and a pipeline supporting unit is arranged on the upper portion of the groove.
3. The spaced soil liquefaction resisting capacity improving device for the landing section of the submarine pipeline according to claim 2, wherein: the depth of the groove is 0.15m, and the pipeline supporting unit is a rubber cushion layer with the thickness of more than or equal to 0.05m and completely covers the groove.
4. The spaced soil liquefaction resisting capacity improving device for the landing section of the submarine pipeline according to claim 1, wherein: the bottom of the covering base is prefabricated with a plurality of cones, the lateral parts of the two sides are prefabricated with soil body edge compacting wings, hollow channels are pre-opened in the soil body edge compacting wings, and two grooves are prefabricated in the upper part and correspond to two convex grooves prefabricated at the bottom of the temporary covering body.
5. The spaced soil liquefaction resisting capacity improving device for the landing section of the submarine pipeline according to claim 4, wherein: the material of the covering base is concrete, the width of the upper part of the covering base is 1.5m longer than the diameter of the submarine pipeline, the height of the covering base is 0.3-0.5 m, a steel plate is embedded in the covering base, and reinforcing bars are arranged in the covering base; the inclination angle of the soil body edge compaction wings is 30 degrees.
6. The spaced soil liquefaction resisting capacity improving device for the landing section of the submarine pipeline according to claim 1, wherein: the width of the temporary repeating body is 1.5m longer than the diameter of the submarine pipeline.
7. The spaced soil liquefaction resisting capacity improving device for the landing section of the submarine pipeline according to claim 1, wherein: the arc-shaped base plate is in an upward convex arc shape, and the integral bending angle is 10-15 degrees; the thickness is 0.2 m; the width is 2m longer than the diameter of the pipeline.
8. The spaced soil liquefaction resisting capacity improving device for the landing section of the submarine pipeline according to claim 1, wherein: the diameter of the drainage sleeve is 100-200 mm, the drainage sleeve is made of a plastic PE pipe, and the length of the drainage sleeve is 1m longer than the embedding depth of the submarine pipeline; the distance between the drainage sleeve and the outer edge of the cover base is 0.3-0.5 m; sieve pores with the aperture of 25mm are prefabricated on the pipe wall within the range of 2m at the lower part of the drainage sleeve; the average particle size of the backfilled gravel is 60 mm.
9. The spaced soil liquefaction resisting capacity improving device for the landing section of the submarine pipeline according to claim 1, wherein: the length of the cover base, the temporary cover body and the arc-shaped base plate along the axial direction of the submarine pipeline is 2m, and the cover base, the temporary cover body and the arc-shaped base plate are arranged at intervals of 5-10 m.
10. The spaced soil liquefaction resisting capacity improving device for the landing section of the submarine pipeline according to claim 1, wherein: lifting lugs are arranged on the cover base, the temporary cover body and the arc-shaped base plate.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110258659A (en) * | 2019-06-19 | 2019-09-20 | 中国石油工程建设有限公司 | Submarine pipeline logs in section compartment soil body anti-liquefying ability lifting device and a method |
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2019
- 2019-06-19 CN CN201920921730.3U patent/CN210216519U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110258659A (en) * | 2019-06-19 | 2019-09-20 | 中国石油工程建设有限公司 | Submarine pipeline logs in section compartment soil body anti-liquefying ability lifting device and a method |
| CN110258659B (en) * | 2019-06-19 | 2024-03-12 | 中国石油工程建设有限公司 | Submarine pipeline landing section interval type soil liquefaction resistance improving device and method |
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Effective date of registration: 20210223 Address after: No. 6, Sichuan hi tech Zone, sublime Road, Chengdu, Sichuan Patentee after: CHINA PETROLEUM ENGINEERING & CONSTRUCTION Corp. Patentee after: CHINA NATIONAL PETROLEUM Corp. Address before: No. 6, Sichuan hi tech Zone, sublime Road, Chengdu, Sichuan Patentee before: CHINA PETROLEUM ENGINEERING & CONSTRUCTION Corp. |
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