CN113868784A - Gravity type normal pressure dry type cabin base stability calculation method - Google Patents
Gravity type normal pressure dry type cabin base stability calculation method Download PDFInfo
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- CN113868784A CN113868784A CN202111022153.2A CN202111022153A CN113868784A CN 113868784 A CN113868784 A CN 113868784A CN 202111022153 A CN202111022153 A CN 202111022153A CN 113868784 A CN113868784 A CN 113868784A
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Abstract
The invention relates to the technical field of marine oil engineering calculation, and discloses a method for calculating the seat bottom stability of a gravity type normal-pressure dry-type cabin, wherein a steel structure box-shaped body is fixedly connected to the upper end of a cabin body, a sealing door is movably connected to the surface of the cabin body, an anti-sinking plate is fixedly connected to the surface of the cabin body, the steel structure box-shaped body is installed at an opening at the upper end of the cabin body, the sealing door is installed on the front surface and the rear surface of the cabin body, the sealing door can also be installed on the bottom surface of the cabin body under different conditions, the anti-sinking plate is installed at the lower ends, perpendicular to the surface of the cabin body, of the left side surface and the right side surface of the lower end of the cabin body, and the sealing door is generally installed on the front surface and the rear surface of the cabin body through the steel structure box-shaped body with the opening at the upper end of the cabin body, and sometimes the sealing door is also arranged on the bottom surface; the two sides of the lower end of the cabin body are perpendicular to the cabin body and are respectively connected with an anti-sinking plate for calculating the stability of the dry cabin base, and the calculation result can be used for checking the anti-sinking plates and for checking the stability of the dry cabin in mud surface operation in the operation sea area.
Description
Technical Field
The invention relates to the technical field of marine petroleum engineering calculation, in particular to a method for calculating the stability of a seat of a gravity type normal-pressure dry-type cabin.
Background
The gravity type normal pressure dry type cabin is a structure for maintaining or changing the submarine pipeline under the normal pressure environment, when the dry type cabin is not available in the past, the submarine pipeline is maintained by a method that a diver is required to perform under an underwater wet environment, and a method that the submarine pipeline is lifted to a position above a deck surface of a ship by a floating crane for maintenance and then is lowered to a position of a submarine mud surface after maintenance, if the dry cabin is not used for maintenance, the production is required to be stopped, the cost is high, the construction period is long, if the gravity type normal pressure dry cabin is used for maintenance, the production can be stopped or the maintenance can not be stopped, meanwhile, the construction risk of divers is reduced, and the calculation method of the stability of the dry cabin base is characterized in that when the dry cabin is operated, the method is carried out along with the use of the gravity type normal pressure dry cabin.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a method for calculating the stability of a seat of a gravity type normal pressure dry type cabin, which has the advantages of being capable of maintaining without stopping production and reducing the construction risk of divers.
The invention adopts the following technical scheme for realizing the technical purpose:
a method for calculating the base stability of a gravity type normal-pressure dry-type cabin comprises a cabin body, wherein a steel structure box-shaped body is fixedly connected to the upper end of the cabin body, a sealing door is movably connected to the surface of the cabin body, and an anti-sinking plate is fixedly connected to the surface of the cabin body.
As the preferred technical scheme of the invention, the steel structure box-shaped body is arranged at the opening at the upper end of the cabin body, so that the operability of the whole device is more powerfully enhanced, and the firmness and the stability of the device in the using process are ensured.
As a preferred technical scheme of the invention, the sealing doors are arranged on the front surface and the rear surface of the cabin body, and the sealing doors can also be arranged on the bottom surface of the cabin body under different conditions, so that the controllability of workers on the whole device is increased to the greatest extent, the experience of the whole device in use is improved, and the seat operating difficulty of the workers is reduced.
As the preferred technical scheme of the invention, the anti-sinking plates are arranged at the lower ends of the left and right side surfaces of the lower end of the cabin body, which are vertical to the surface of the cabin body, so that the balance effect of the whole device is effectively enhanced, the uneven stress in different directions is avoided, and the practicability of the whole device is ensured.
A gravity type normal pressure dry type cabin base stability calculation method comprises the following specific steps:
s1, the working content provided by the invention application comprises the following steps:
determining a design basis for calculating stability of a base, wherein the design basis comprises parameters such as water depth, wind, waves, flow, soil and the like;
determining and calculating the combination of the environmental load direction and the working condition;
thirdly, carrying out accounting on the anti-sinking plate, wherein the accounting comprises the strength of the anti-sinking plate, the soil slippage stability, the soil bearing capacity and the like;
checking the stability of the base, including the balance weight, and judging whether the base overturns under the action of an environmental load;
s2, determining the highest tide level and the lowest tide level during the operation according to a tide table, determining the maximum wave height and the maximum flow speed during the operation, limiting the wind speed of the operation, and the shear strength of the surface soil without water drainage, the allowable bearing capacity and the like;
s3, the direction of the environmental load in the step II is generally 0-360 degrees, and at least 8 typical directions are selected; and distinguish wind and flow load in different directions of low water level (or low tide level), wave load, and wind and flow load in different directions of high water level (or high tide level), wave load, hydrostatic pressure at high/low water level, resultant force of self-weight and buoyancy at high/low water level, counterweight load, etc.;
s4, in the second step, because the dry cabin is a rectangular box and is not completely suitable for the Morison equation, the wave load calculation method in JTJ 213-98 Harbour hydrological Specification is adopted, after the result is calculated, the wave load is manually added into the SACS model or other calculation programs, and other loads can be directly calculated in the programs or manually calculated by adopting the SACS program or other calculation programs, so the combined working condition in the second step is the combination of all loads at all angles;
s5, in the third step, the section attributes (such as section inertia moment and the like) of the anti-settling plate to different directions need to be calculated firstly, then the compressive stress of the anti-settling plate caused by vertical load and overturning moment is calculated and combined, then the soil bearing capacity is checked, then the soil slippage stability is checked, then the plate and beam structural strength of the anti-settling plate is checked, the above processes can be checked through self-programming calculation programs or manually calculated, and the calculation process needs to distinguish high/low water levels and different directions and check respectively;
and S6, checking the stability of the seat bottom in the fourth step, wherein the overturning moment generated by the environmental load and the restoring moment generated by the vertical load need to be calculated, and whether the seat bottom is overturned or not is checked.
The invention has the following beneficial effects:
according to the method for calculating the base stability of the gravity type normal-pressure dry-type cabin, a steel-structure box-shaped body with an opening at the upper end of a cabin body is adopted, sealing doors are generally installed on the front side and the back side of the cabin body, and sometimes the sealing doors are also arranged on the bottom surface; the two sides of the lower end of the cabin body are perpendicular to the cabin body and are respectively connected with an anti-sinking plate for calculating the stability of the dry cabin base, and the calculation result can be used for checking the anti-sinking plates and for checking the stability of the dry cabin in mud surface operation in the operation sea area.
Drawings
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a schematic side view of a dry chamber of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a method for calculating seat bottom stability of a gravity type normal pressure dry-type cabin comprises a cabin body, wherein a steel structure box-shaped body is fixedly connected to the upper end of the cabin body, the control capability of the whole device is enhanced to the maximum extent, the practicability of the whole device is guaranteed, the steel structure box-shaped body is arranged at an upper opening of the cabin body, the stability of each component is effectively enhanced, the supporting force of the whole device is enhanced, a sealing door is movably connected to the surface of the cabin body, the flexibility of the whole device is better enhanced, the use feeling is improved, the sealing door is arranged on the front surface and the rear surface of the cabin body, the sealing door can be arranged on the bottom surface of the cabin body under different conditions, the use effect of the whole device is effectively enhanced, the use convenience is improved, an anti-sinking plate is fixedly connected to the surface of the cabin body, and the use of the whole device is better protected from being affected, the practicality of the operation of the whole device is enhanced, the anti-sinking plates are arranged at the lower ends of the left side surface and the right side surface of the lower end of the cabin body and the lower ends of the cabin body which are vertical to the surface of the cabin body, the balance of the whole device is better enhanced, and the use flexibility of the whole device is effectively enhanced.
The implementation method comprises the following steps:
a gravity type normal pressure dry type cabin base stability calculation method comprises the following specific steps:
s1, the working content provided by the invention application comprises the following steps:
determining a design basis for calculating stability of a base, wherein the design basis comprises parameters such as water depth, wind, waves, flow, soil and the like;
determining and calculating the combination of the environmental load direction and the working condition;
thirdly, carrying out accounting on the anti-sinking plate, wherein the accounting comprises the strength of the anti-sinking plate, the soil slippage stability, the soil bearing capacity and the like;
checking the stability of the base, including the balance weight, and judging whether the base overturns under the action of an environmental load;
s2, determining the highest tide level and the lowest tide level during the operation according to a tide table, determining the maximum wave height and the maximum flow speed during the operation, limiting the wind speed of the operation, and the shear strength of the surface soil without water drainage, the allowable bearing capacity and the like;
s3, the direction of the environmental load in the step II is generally 0-360 degrees, and at least 8 typical directions are selected; and distinguish wind and flow load in different directions of low water level (or low tide level), wave load, and wind and flow load in different directions of high water level (or high tide level), wave load, hydrostatic pressure at high/low water level, resultant force of self-weight and buoyancy at high/low water level, counterweight load, etc.;
s4, in the second step, because the dry cabin is a rectangular box and is not completely suitable for the Morison equation, the wave load calculation method in JTJ 213-98 Harbour hydrological Specification is adopted, after the result is calculated, the wave load is manually added into the SACS model or other calculation programs, and other loads can be directly calculated in the programs or manually calculated by adopting the SACS program or other calculation programs, so the combined working condition in the second step is the combination of all loads at all angles;
s5, in the third step, the section attributes (such as section inertia moment and the like) of the anti-settling plate to different directions need to be calculated firstly, then the compressive stress of the anti-settling plate caused by vertical load and overturning moment is calculated and combined, then the soil bearing capacity is checked, then the soil slippage stability is checked, then the plate and beam structural strength of the anti-settling plate is checked, the above processes can be checked through self-programming calculation programs or manually calculated, and the calculation process needs to distinguish high/low water levels and different directions and check respectively;
and S6, checking the stability of the seat bottom in the fourth step, wherein the overturning moment generated by the environmental load and the restoring moment generated by the vertical load need to be calculated, and whether the seat bottom is overturned or not is checked.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. A method for calculating the base stability of a gravity type normal-pressure dry-type cabin comprises a cabin body and is characterized in that: the upper end fixedly connected with steel construction box-shaped body of the cabin body, the surperficial swing joint of the cabin body has sealing door, and the fixed surface of the cabin body is connected with and prevents sinking the board.
2. The method for calculating the stability of the seat of the gravity type atmospheric dry cabin according to claim 1, wherein the method comprises the following steps: the steel structure box-shaped body is arranged at the opening at the upper end of the cabin body.
3. The method for calculating the stability of the seat of the gravity type atmospheric dry cabin according to claim 1, wherein the method comprises the following steps: the sealing door is arranged on the front surface and the rear surface of the cabin body, and under different conditions, the sealing door can also be arranged on the bottom surface of the cabin body.
4. The method for calculating the stability of the seat of the gravity type atmospheric dry cabin according to claim 1, wherein the method comprises the following steps: the anti-sinking plates are arranged at the lower ends of the left and right side surfaces of the lower end of the cabin body, which are vertical to the surface of the cabin body.
5. The method for calculating the stability of the seat of the gravity type normal pressure dry cabin according to claim 1 comprises the following steps:
s1, the working content provided by the invention application comprises the following steps:
determining a design basis for calculating stability of a base, wherein the design basis comprises parameters such as water depth, wind, waves, flow, soil and the like;
determining and calculating the combination of the environmental load direction and the working condition;
thirdly, carrying out accounting on the anti-sinking plate, wherein the accounting comprises the strength of the anti-sinking plate, the soil slippage stability, the soil bearing capacity and the like;
checking the stability of the base, including the balance weight, and judging whether the base overturns under the action of an environmental load;
s2, determining the highest tide level and the lowest tide level during the operation according to a tide table, determining the maximum wave height and the maximum flow speed during the operation, limiting the wind speed of the operation, and the shear strength of the surface soil without water drainage, the allowable bearing capacity and the like;
s3, the direction of the environmental load in the step II is generally 0-360 degrees, and at least 8 typical directions are selected; and distinguish wind and flow load in different directions of low water level (or low tide level), wave load, and wind and flow load in different directions of high water level (or high tide level), wave load, hydrostatic pressure at high/low water level, resultant force of self-weight and buoyancy at high/low water level, counterweight load, etc.;
s4, in the second step, because the dry cabin is a rectangular box and is not completely suitable for the Morison equation, the wave load calculation method in JTJ 213-98 Harbour hydrological Specification is adopted, after the result is calculated, the wave load is manually added into the SACS model or other calculation programs, and other loads can be directly calculated in the programs or manually calculated by adopting the SACS program or other calculation programs, so the combined working condition in the second step is the combination of all loads at all angles;
s5, in the third step, the section attributes (such as section inertia moment and the like) of the anti-settling plate to different directions need to be calculated firstly, then the compressive stress of the anti-settling plate caused by vertical load and overturning moment is calculated and combined, then the soil bearing capacity is checked, then the soil slippage stability is checked, then the plate and beam structural strength of the anti-settling plate is checked, the above processes can be checked through self-programming calculation programs or manually calculated, and the calculation process needs to distinguish high/low water levels and different directions and check respectively;
and S6, checking the stability of the seat bottom in the fourth step, wherein the overturning moment generated by the environmental load and the restoring moment generated by the vertical load need to be calculated, and whether the seat bottom is overturned or not is checked.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111022153.2A CN113868784A (en) | 2021-09-01 | 2021-09-01 | Gravity type normal pressure dry type cabin base stability calculation method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111022153.2A CN113868784A (en) | 2021-09-01 | 2021-09-01 | Gravity type normal pressure dry type cabin base stability calculation method |
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| CN113868784A true CN113868784A (en) | 2021-12-31 |
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| CN202111022153.2A Pending CN113868784A (en) | 2021-09-01 | 2021-09-01 | Gravity type normal pressure dry type cabin base stability calculation method |
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- 2021-09-01 CN CN202111022153.2A patent/CN113868784A/en active Pending
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| PB01 | Publication | ||
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| TA01 | Transfer of patent application right |
Effective date of registration: 20230627 Address after: 100010 No. 25 North Main Street, Dongcheng District, Beijing, Chaoyangmen Applicant after: CHINA NATIONAL OFFSHORE OIL Corp. Applicant after: OFFSHORE OIL ENGINEERING Co.,Ltd. Applicant after: COOEC SUBSEA TECHNOLOGY Co.,Ltd. Address before: 100010 No. 25 North Main Street, Dongcheng District, Beijing, Chaoyangmen Applicant before: CHINA NATIONAL OFFSHORE OIL Corp. Applicant before: OFFSHORE OIL ENGINEERING Co.,Ltd. |
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Address after: 100010 No. 25 North Main Street, Dongcheng District, Beijing, Chaoyangmen Applicant after: CHINA NATIONAL OFFSHORE OIL Corp. Applicant after: OFFSHORE OIL ENGINEERING Co.,Ltd. Applicant after: CNOOC Shenzhen Ocean Engineering Technology Service Co.,Ltd. Address before: 100010 No. 25 North Main Street, Dongcheng District, Beijing, Chaoyangmen Applicant before: CHINA NATIONAL OFFSHORE OIL Corp. Applicant before: OFFSHORE OIL ENGINEERING Co.,Ltd. Applicant before: COOEC SUBSEA TECHNOLOGY Co.,Ltd. |
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| CB02 | Change of applicant information |