Marine gravity platform with embedded foundation

FIELD: construction.

SUBSTANCE: platform comprises a body, a foundation part with a bottom slab equipped with ribs embedded into the foundation soil. At the same time the foundation in its lower part along the entire perimeter at the outer side is equipped with ploughshares with depth of submersion and distance between them determined on the basis of the given expression. The ploughshare width is also made from the mathematical expression.

EFFECT: reduced material intensity in development of a marine gravity platform, reduced volume of ballast for provision of ribs embedding into the foundation soil, increased stability and bearing capacity of the soil foundation, increased reliability and reduced risk of loss of gravity platform stability during the period of operation under action of combined external impact of loads.

4 cl, 6 dwg

 

The invention relates to the field of hydraulic engineering construction and can be used for the establishment and operation of offshore gravity platforms for the development of hydrocarbon resources on the continental shelf.

Known platform of the gravitational type, comprising a housing, which serves as a support for the placement of surface maintenance of technological equipment (U.S. patent No. 3824795). The bottom shell platform - Foundation in the form of a flat plate rests directly on the bottom of the reservoir or artificial base (bed) and supports the design of the top surface of the platform structure, where operational technological equipment for the preparation of hydrocarbon transportation.

A disadvantage of the gravity platform with a Foundation in the form of a flat plate is the low resistance to horizontal shear loads, in particular ice, high local contact stresses at the base of a flat plate. In addition to this required careful planning of natural or artificial base to ensure the necessary contact between the Foundation and the ground.

Known gravity platform, comprising a housing, a base portion with a bottom plate equipped with ribs, which deepened in the soil of the seabed. The space between PL�and the sea bottom is filled with cement mortar (patent France No. 2335133). This platform has several advantages, in particular, higher stability and uniform contact stresses. Moreover, the design of the Foundation allows you to refuse the execution of a preliminary grading the bottom of the reservoir or the construction of artificial bases (bed).

However, the drawback of this platform, equipped with ribs, is the need for a major effort to zadavlivaniya their ground base, which leads to limitation of depth zadavlivaniya and not reaching edges durable layers of soil and, consequently, reduction of the bearing capacity of Foundation, or to increase the size of the ballast tanks. In practice and calculations, the water depth in waters less than 15-20 meters crushing the ribs to a predetermined depth in a sturdy layers of soil is not possible because of the small installation of the platform weight (reference weight of the unit plus the weight of the ballast).

The aim of the invention is to reduce material consumption due to the decrease of the resistance forces nadavlivanii ribs by the dive at a shallower depth (only on the depth of soft ground) generated by the weight of the platform and ballast (set weight), and dip by ramming (dip) advanced openers in durable layers of soil.

This goal is achieved due to the fact that in the known gravitational platfor�IU, comprising a housing, a base portion with a bottom plate equipped with ribs in the bottom of the perimeter of the Foundation openers installed height required to achieve when you install a solid-surface soil, with the distance between the coulters determined from the expression

B2Htanαtanϕ(1)

where B is the distance between the coulters, m;

H is the immersion depth of the Coulter, m;

φ - angle of internal friction of soil, deg;

α - the angle protruding, hail, determined from the equation (see S. N. Levichev, V. G. Fedorovsky, Y. M. Kolesnikov, S. V. Carillo. Calculation of pile Foundation of hydraulic structures. M., Energoatomizdat, 1986, p. 61).

Moreover, the width of the opener appointed in accordance with the formula

where b is the width of the opener, m;

k is an empirical coefficient, k≥1,0.

The value of the empirical coefficient k is set on the basis of the analysis of data (engineering-geological conditions of the site of installation of the platform, loads acting on the platform, the conditions of possibility of erosion of the soil base� platform) to assure maximum bearing capacity of the subgrade (stability platform) for the combined effect of external loads.

In addition, in difficult geological conditions conducted experimental studies to clarify the width of the opener, at which the maximum bearing capacity of Foundation soil (stability platform).

Openers in a horizontal cross-sectional shape is rectangular, and in the vertical plane - a flat, usually rectangular or trapezoidal and triangular in shape with the thickness of the metal that provides the Flexural strength of the opener when immersed in the ground and in the operating position during operation of the platform (usually the thickness of the metal opener is 20-40 mm). In the upper part of the opener is set to reference the headgear.

The technical result provided by the invention are as follows:

- reducing the consumption of materials in the creation of an offshore gravity platform due to the decrease of the resistance forces nadavlivanii;

- increasing the stability and bearing capacity of Foundation soil due to the openers dip in strong soil layers and transfer loads from gravity platform these rugged dirt base layers;

- improving the reliability and reducing the risk of losing us�ascioti gravity platform during operation under the action of combined external impact loads by increasing the stability of the structure;

- reducing the risk of accidents, environmental pollution due to the loss of stability of gravity of the platform and the violation of normal operation of the downhole and process equipment, piping systems.

The problem is solved in that in the technical solution design of offshore gravity platform, comprising a housing, a base portion with a bottom plate equipped with ribs according to the invention in the lower part of the perimeter of the Foundation openers installed height H required to achieve when you install a solid-surface soil, with the distance between the coulters B. In the upper part of the opener sets the abutment pile cap. Width b opener appointed not less than the distance between the openers Openers B. in the horizontal section shape is rectangular, in the vertical plane - a flat, usually rectangular, trapezoidal or triangular shape with the thickness of the metal that provides the Flexural strength of the opener when immersed in the ground and a working position during operation of the platform.

Set of new essential distinctive features with other essential features allows to solve a new problem, namely to reduce the power consumption by reducing the resistance forces of ass�the Libanius, to improve the stability and bearing capacity of the subgrade offshore gravity platform by openers dip in durable layers of soil, which ultimately leads to increased reliability, durability, reduce the risk of accidents.

The invention is illustrated by drawings, where Fig.1 shows the basic components and elements of an offshore gravity platform, ensuring the implementation of the proposed technical solution, afloat in the transport position, Fig.2 - offshore gravity platform, mounted on a natural base with crushed in the subgrade strip flat ribs (when available) in a relatively weak Foundation soil Fig.3 - gravity platform submerged openers in durable subgrade layers by any known method (for example, pile-driving equipment), Fig.4 is a longitudinal sectional view of the platform shipped with the openers in the solid soil of the seabed, Fig.5 - dip openers in the ground, Fig.6 - plan of the Foundation platform from the openers.

Offshore gravity platform with deepened foundations (Fig.1) comprises a support body 1. On the supporting body mounted upper structure 2. In the lower part of the supporting body is equipped with Foundation 3 bottom plate 4, is provided with a gap 5 along the perimeter of the Foundation for �opener apparatus 6. In the lower part of the perimeter Foundation installed openers 6, the top of which is provided with a support caps with 7 pin retainer 8. Openers 6 is installed in the gap between the Foundation 3 and the limiting straps 9, which is fastened to the base 3 through the gusset plate 10, the thickness not less than the thickness of the openers. In the transport position openers 6 are fixed by any known method, for example, by means of a metal retainer that has low strength characteristics in comparison with the Coulter 6. Also shows the subgrade, consisting of a weak layer 11 and a solid ground layer 12.

The angle of the protruding α indicated in Fig.4, and the angle of internal friction φ - Fig.6. In addition, in Fig.3, 4, 6 the designation of the depth of the Coulter H, the height of the ribs h, the distance between the coulters B and its width b.

The invention is implemented as follows.

In stationary plant conditions (e.g., dry dock) carry out the construction of the support body 1, the upper structure 2, a base part 3 with the bottom plate 4, which is mounted to the ribs (without bandpass flat ribs). On the perimeter from the outside install limiting straps 9 through the gusset plate 10 with the formation of the gap 5 by the cross-sectional dimension of the opener 6. The height of the sock are selected on the basis of engineering geological condition�of Ovi site thus, the openers were shipped in durable layers of soil 12 to provide the desired stability of the platform. Weak soil layer 11 must be passed by the opener 6. The height of the ribs (if any) is also prescribed on the basis of engineering-geological conditions so that they were weak soil layer 11 and reached a solid layer of soil 12. Openers have 6 at this distance from each other so that the prism vapora in a solid layer of soil formed by the openers 6 in buckling of structures that were within the soil layer 12. Based on this condition, the distance between the coulters 6 is determined by the expression (1). Openers usually have either a rectangular or trapezoidal and triangular in the lower part, which is immersed in a solid layer of soil 12, which reduces the resistance force immersing (padding) opener 6 in a durable layer of soil 12. Thickness opener 6 is assigned based on the strength calculation of the loads acting on the vomer in the process of immersion and operation of the platform, and it usually is 20-40 mm. Width of the opener 6 shall be appointed in accordance with the expression (3). In complex geological conditions, the width of the vomer and the length of the gap is determined on the basis of experimental studies of the conditions to achieve the maximum bearing capacity of the subgrade (maximum molten�resistance of the structure). Manufactured openers 6 together with the supporting pile cap 7 and the pin retainer 8 are installed in the clearance between the base part and limiting straps 9, which are made of at least two. Openers 6 are installed so that the bottom end of the opener 6 does not protrude from base plate 4, which is achieved by installation of locks of any design, for example, set the key of soft metal, which is cut in driving opener 6.

After performing routine maintenance in dry dock platform is removed from the dock and transported her to the place of installation. Upon arrival at the place of installation to produce a partial palletirovanie of the housing 1 of the platform, whereby the platform is lowered, and then applies a weak soil layer 11 of the seabed ribs. Platform position and conduct further palletirovanie with nadavlivanie of edges in weak soil layer 11 until they reach a solid soil layer 12 and the resistance force zadavlivaniya sharply. At this point, further palletirovanie stop installation and the weight of the platform (the weight of the platform plus the weight of the ballast) reaches its maximum. After checking the verticality of the platform begin work on the openers dip 6 using underwater hammers or vibrators, locking them on the abutment pile cap 7 by means of pins f�of kitarov 8. The driving control openers 6 ground base 12 is carried out using underwater videos are secured and transmitted to the operator on the ship. After reaching opener design position driving this opener 6 is terminated, and proceed to the next dive opener 6. Preferably the driving conduct alternately on diametrically opposite sides of the Foundation 3 of the housing 1. After driving opener 6 if necessary they inject cement into the intercostal space between the plate 4 and the soil layer 11 of the seabed.

In General, the described solution allows you in addition to basic achievable goals to better protect the Foundation from erosion.

Thus, the application of the proposed technical solution allows to expand the range of depths (in the direction of a significant decrease in their values), which can effective use of gravitational structures with embedded foundations.

The analysis of the prior art showed that the claimed set of essential features set forth in the claims is unknown. This allows to make a conclusion about its compliance with the criterion of "novelty."

To verify compliance of the claimed invention, the criterion of "inventive step" conducted an additional search of the known technical�technical solutions with the aim of identifying signs coinciding with the distinctive features of the prototype features of the claimed technical solution. Found that the claimed technical solution is not obvious from the prior art. Therefore, the claimed invention meets the criterion of "inventive step".

Described above is new, industrially applicable technical solution is a single inventive concept, is responsible, in our opinion, the criterion of inventive step, therefore, is offered for the legal protection of a patent.

1. Offshore gravity platform with a deep Foundation, comprising a housing, a base portion with a bottom plate equipped with ribs, bury in the ground, characterized in that, to reduce material consumption while improving the sustainability of the platform, the Foundation in its lower part around the perimeter from the outside is equipped with coulters with depth and distance between them is determined from the expression
B≤2H tanα tanφ,
where B is the distance between the coulters, m;
H is the immersion depth of the Coulter, m;
φ - angle of internal friction of soil, deg;
α - the angle protruding, hail, determined from the equation

the opener is made of a width determined from the expression
b≥kB,
where b is the width of the opener, m;
k - e�pricheski coefficient, k≥1,0, determined on the basis of experimental studies.

2. Platform according to claim 1, characterized in that the opener is made of rectangular shape in the zone of immersion in strong soil layers.

3. Platform according to claim 1, characterized in that the opener is made trapezoidal shape in the zone of immersion in strong soil layers.

4. Platform according to claim 1, characterized in that the opener is made of triangular shape in the zone of immersion in durable layers of pound.



 

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