CN112500054A - Submarine pipe cable protective pad, content of submarine pipe cable protective pad and content preparation method - Google Patents
Submarine pipe cable protective pad, content of submarine pipe cable protective pad and content preparation method Download PDFInfo
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- CN112500054A CN112500054A CN202011291167.XA CN202011291167A CN112500054A CN 112500054 A CN112500054 A CN 112500054A CN 202011291167 A CN202011291167 A CN 202011291167A CN 112500054 A CN112500054 A CN 112500054A
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- Prior art keywords
- eva
- ethyl acetate
- acetate solution
- content
- ratio
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Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
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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
- F16L1/123—Devices for the protection of pipes under water
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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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- 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
- F16L1/20—Accessories therefor, e.g. floats, weights
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/74—Underwater applications
Abstract
The invention discloses a submarine pipe cable protective pad, contents of the submarine pipe cable protective pad and a preparation method of the contents, wherein the contents comprise silt and an EVA/ethyl acetate solution, and the ratio of the silt to the EVA/ethyl acetate solution is 50-150: 7.5-22.5; the sediment comprises cement and sand, and the ratio of the cement to the sand is 0.5-1.5: 1.5-4.5; the EVA/ethyl acetate solution comprises EVA and ethyl acetate, and the ratio of the EVA to the ethyl acetate is 15-45: 50-150. The invention changes the traditional protection mode of the submarine cable, and the prepared contents are filled in the protection pad to prevent the protection pad from adding a reliable protection layer to the submarine cable, thereby improving the protection reliability and prolonging the protection time-efficiency.
Description
Technical Field
The invention relates to a submarine pipeline cable protection technology, in particular to a submarine pipeline cable protection pad, contents of the submarine pipeline cable protection pad and a content preparation method.
Background
In the face of complex submarine environment, the submarine cable is guaranteed to be available for long-term effective use, and the problem to be solved is urgently needed. At present, the traditional methods of sand bag throwing, cement block throwing and the like are mainly adopted for protecting the submarine pipe cable in the seawater system. The method can damage the cable, and simultaneously has the problems of easy washing away, failure protection or poor timeliness, is greatly influenced by uncertain factors, has low reliability, and therefore needs to be maintained frequently or repeated protection construction, and has high comprehensive cost due to repeated occurrence of direct cost (material cost required for maintenance) and indirect cost (construction equipment cost, labor cost, time consumption and the like).
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a submarine cable protection pad, contents of the submarine cable protection pad and a content preparation method.
The first technical scheme adopted by the invention is as follows: the content of the submarine pipe cable protective pad comprises silt and an EVA/ethyl acetate solution, wherein the ratio of the silt to the EVA/ethyl acetate solution is 50-150: 7.5-22.5; the sediment comprises cement and sand, and the ratio of the cement to the sand is 0.5-1.5: 1.5-4.5; the EVA/ethyl acetate solution comprises EVA and ethyl acetate, and the ratio of the EVA to the ethyl acetate is 15-45: 50-150.
Further, the ratio of the silt to the EVA/ethyl acetate solution is 100: 15.
Further, the ratio of the cement to the sand is 1: 3.
Further, the ratio of the EVA to the ethyl acetate is 30: 100.
Furthermore, the EVA is made of an EVA material with the vinyl acetate content of not less than 40%.
Further, the contents also include a retarder.
The second technical scheme adopted by the invention is as follows: a preparation method of the content comprises the following steps:
step 1, mixing EVA and ethyl acetate according to a ratio of 15-45: 50-150, and stirring in a water bath at a temperature of 80 ℃ until the EVA is completely dissolved to obtain an EVA/ethyl acetate solution;
and 5, standing the sediment formed in the step 4 until ethyl acetate is volatilized to obtain the content of the protective pad.
The third technical scheme adopted by the invention is as follows: a subsea umbilical protection pad containing the contents, comprising:
a cage-like support frame;
the above-mentioned contents, which are filled in the cage-like support frame; and the number of the first and second groups,
an outer protective layer wrapping the caged support frame and the contents therein.
Furthermore, the cage-shaped supporting frame is made of a double-twisted steel wire mesh.
Further, the cage-shaped supporting frame and the contents are fixedly connected through bolts and fastened through lifting ring nuts; wherein the lifting ring nut is provided with an internal thread part which is used for being matched with the bolt and a lifting ring part which is used as a lifting point; and the upper and lower inner surfaces of the cage-shaped supporting frame and the positions of the bolts are provided with backing plates.
The invention has the beneficial effects that:
the protective pad has simple content components, mainly comprises cement, sand, EVA and ethyl acetate, is easy to obtain raw materials, can adjust the setting time by proportioning the mass parts of the materials, and is beneficial to matching with the actual construction requirement.
The inner layer of the protective pad is formed by welding a cage-shaped double-twisted steel wire mesh serving as a main body framework, the bottom of the protective pad is welded with hoisting points, the middle of the protective pad is filled with contents, and the outer layer of the protective pad is made of geotextile serving as a covering.
Drawings
FIG. 1: the invention relates to a front view of a submarine pipe cable protective cushion structure;
FIG. 2: the invention relates to a side view of a submarine umbilical protection pad structure;
FIG. 3: section a-a in fig. 1;
FIG. 4: b in fig. 3 is a partially enlarged view;
the attached drawings are marked as follows:
1-content 2-cage-shaped supporting frame
3-external protective layer 4-bolt
5-lifting ring nut 6-backing plate
Detailed Description
In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings:
a subsea umbilical protection pad contents 1 for filling within a protection pad. The content 1 comprises silt and an EVA/ethyl acetate solution, and the ratio of the silt to the EVA/ethyl acetate solution is 50-150: 7.5-22.5; the sediment comprises cement and sand, and the ratio of the cement to the sand is 0.5-1.5: 1.5-4.5; the EVA/ethyl acetate solution comprises EVA and ethyl acetate, the ratio of the EVA to the ethyl acetate is 15-45: 50-150, and the EVA is made of an EVA material with the vinyl acetate content not lower than 40%.
Example 1
The ratio of EVA to ethyl acetate is 15:150, the ratio of cement to sand is 1:1, and the ratio of sand to EVA/ethyl acetate solution is 50: 22.5. The content 1 prepared under the mixture ratio has the advantages of short curing time, good impact resistance and compression resistance, higher performance indexes than actual requirements and relatively higher comprehensive cost.
Example 2
The ratio of EVA to ethyl acetate is 45:50, the ratio of cement to sand is 1:2, and the ratio of sand to EVA/ethyl acetate solution is 150: 7.5. The content 1 prepared under the proportion has longer EVA dissolution time in ethyl acetate, moderate solidification time of the content 1 and stable impact resistance and pressure resistance, and can meet the actual requirements.
Example 3
The ratio of EVA to ethyl acetate is 30:100, the ratio of cement to sand is 1:3, and the ratio of sand to EVA/ethyl acetate solution is 100: 15. The content 1 prepared according to the proportion has the advantages of moderate curing time, slightly longer curing time than that of the content in the embodiment 2, stable impact resistance and pressure resistance, capability of meeting actual requirements, low comprehensive cost and high cost performance.
In order to delay the curing time of the content 1 and avoid the situation that the protective mat is not installed on the content 1 and is cured and shaped and influences subsequent operation and use during actual construction, a retarder can be added into the content 1. The retarder can adopt hydroxyethylidene diphosphonic acid tetrasodium (HEDP. Na4) or sodium gluconate, and the proper amount of the retarder can be selected according to the actual engineering requirement.
The formula with the mass ratio of the cement to the sand being 1:2 and 1:3 is selected to carry out optimization experiments on different retarders and the using amount of the retarder, and the results are shown in tables 1 and 2:
TABLE 1 silt ratio Cure times at different levels of tetrasodium hydroxyethylidenediphosphonate (HEDP. Na4)
TABLE 2 solidification time of silt ratio at different sodium gluconate contents
According to the optimization experiment, the method has the advantages that the curing time of the sand is greatly prolonged along with the increase of the content of HEDP Na4 by adding different contents of hydroxyethylidene tetrasodium diphosphonate (HEDP Na4) into cement sand with different sand-sand ratios; the same phenomenon was observed in silt to which different amounts of sodium gluconate were added, but sodium gluconate had a better effect of delaying the solidification of silt than HEDP Na 4.
According to actual requirements, 0.05 percent of HEDP Na4 or 0.03 percent of sodium gluconate is added into the cement and the sand to meet the requirements.
The preparation method of the content 1 comprises the following steps:
step 1, mixing EVA and ethyl acetate according to a ratio of 15-45: 50-150, stirring for about 4 hours in a water bath at a temperature of 80 ℃, and obtaining an EVA/ethyl acetate solution when the EVA is completely dissolved according to a judgment standard.
And 2, mixing the cement and the sand according to the ratio of 0.5-1.5: 1.5-4.5, and uniformly mixing to obtain the sediment.
And 3, taking the EVA/ethyl acetate solution obtained in the step 1 according to the ratio of the silt to the EVA/ethyl acetate solution of 50-150: 7.5-22.5, and taking the silt in the ratio from the silt obtained in the step 2.
And 5, standing the sediment formed in the step 4 at room temperature (25 ℃) for 24 hours until ethyl acetate volatilizes, thus obtaining the content 1 of the protective pad.
The content 1 is used for manufacturing a submarine pipeline protection pad, and as shown in fig. 1 to 4, the submarine pipeline protection pad comprises a cage-shaped support frame 2, the content 1 and an external protection layer 3.
The cage-shaped supporting frame 2 is made of a double-twisted steel wire mesh. The contents 1 are filled in the cage-shaped support frame 2. The cage-shaped supporting frame 2 and the content 1 are fixedly connected through bolts 4 and fastened through lifting nuts 5, wherein the lifting nuts 5 are provided with internal thread portions and lifting ring portions, the internal thread portions are matched with the bolts 4 for fastening, the lifting ring portions are used as lifting points, and the positions and the number of the bolts 4 and the lifting nuts 5 can be reasonably arranged according to actual requirements, so that offshore construction is facilitated. In addition, the upper inner surface and the lower inner surface of the cage-shaped supporting frame 2 at the positions of the bolts 4 are provided with backing plates 6, and the backing plates 6 can be made of Q235 steel plates.
The outer protective layer 3 wraps the cage-shaped supporting frame 2 and the content 1, and the outer protective layer 3 can be made of non-woven geotextile.
Compared with the traditional protection mode, the structure has better comprehensive capability in protection, high reliability and no need of later maintenance; compared with a foreign flexible protective cushion, the protective cushion has the same performance, but has the advantages of simple structure, easy realization of preparation process, low cost, wide applicability, no components which can influence the environment such as asphalt and the like.
Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and those skilled in the art can make many modifications without departing from the spirit and scope of the present invention as defined in the appended claims.
Claims (10)
1. A submarine pipe cable protective pad content (1) is characterized in that the content (1) comprises silt and an EVA/ethyl acetate solution, and the ratio of the silt to the EVA/ethyl acetate solution is 50-150: 7.5-22.5; the sediment comprises cement and sand, and the ratio of the cement to the sand is 0.5-1.5: 1.5-4.5; the EVA/ethyl acetate solution comprises EVA and ethyl acetate, and the ratio of the EVA to the ethyl acetate is 15-45: 50-150.
2. The inclusion (1) of claim 1, wherein the ratio of silt to EVA/ethyl acetate solution is 100: 15.
3. Contents (1) according to claim 1, characterized in that the ratio of cement to sand is 1: 3.
4. The inclusion (1) according to claim 1, wherein the ratio of EVA to ethyl acetate is 30: 100.
5. Contents (1) according to claim 1, characterized in that said EVA is an EVA material with a vinyl acetate content not lower than 40%.
6. Contents (1) according to claim 1, characterized in that said contents (1) further comprise a retarder.
7. A method for preparing the content (1) according to any one of the preceding claims 1 to 6, characterized in that it comprises the following steps:
step 1, mixing EVA and ethyl acetate according to a ratio of 15-45: 50-150, and stirring in a water bath at a temperature of 80 ℃ until the EVA is completely dissolved to obtain an EVA/ethyl acetate solution;
step 2, mixing cement and sand according to the ratio of 0.5-1.5: 1.5-4.5, and uniformly mixing to obtain silt;
step 3, according to the proportion of 50-150: 7.5-22.5 of the silt and the EVA/ethyl acetate solution, taking the EVA/ethyl acetate solution in the proportion from the EVA/ethyl acetate solution obtained in the step 1, and taking the silt in the proportion from the silt obtained in the step 2;
step 4, adding the EVA/ethyl acetate solution obtained in the step 3 into the sediment obtained in the step 3 in three batches, adding the EVA/ethyl acetate solution with the concentration of 30% in the first batch, and stirring; adding a 30% EVA/ethyl acetate solution into the second batch and stirring; adding 40% EVA/ethyl acetate solution in the third batch, uniformly mixing, and then rolling and molding to obtain molded silt;
and 5, standing the sediment formed in the step 4 until ethyl acetate is volatilized to obtain the content (1) of the protective pad.
8. A subsea umbilical protection pad comprising a content (1) according to any of the preceding claims 1 to 6, comprising:
a cage-like support frame (2);
the content (1) according to any one of claims 1 to 6, said content (1) being filled within said cage-like support frame (2); and the number of the first and second groups,
an outer protective layer (3), the outer protective layer (3) wrapping the cage-like support frame (2) and the contents (1) inside.
9. Submarine umbilical protection mat according to claim 8, wherein the cage-like support frame (2) is made of a double twisted steel wire mesh.
10. Submarine umbilical protection mat according to claim 8, wherein the cage-like support frame (2) and the contents (1) are fixedly connected by means of bolts (4) and fastened by means of eye nuts (5); wherein the lifting ring nut (5) is provided with an internal thread part which is matched with the bolt (4) and a lifting ring part which is used as a lifting point; and the upper inner surface and the lower inner surface of the cage-shaped supporting frame (2) and the positions of the bolts (4) are provided with backing plates (6).
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| CN202011291167.XA CN112500054A (en) | 2020-11-18 | 2020-11-18 | Submarine pipe cable protective pad, content of submarine pipe cable protective pad and content preparation method |
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| CN202011291167.XA CN112500054A (en) | 2020-11-18 | 2020-11-18 | Submarine pipe cable protective pad, content of submarine pipe cable protective pad and content preparation method |
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Application publication date: 20210316 |