US3648466A - Elevated reservoir for use with off-shore oil wells - Google Patents

Elevated reservoir for use with off-shore oil wells Download PDF

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Publication number
US3648466A
US3648466A US34060A US3648466DA US3648466A US 3648466 A US3648466 A US 3648466A US 34060 A US34060 A US 34060A US 3648466D A US3648466D A US 3648466DA US 3648466 A US3648466 A US 3648466A
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Prior art keywords
box
piles
boxes
reservoir
ribs
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Expired - Lifetime
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US34060A
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English (en)
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Henri Houdin
Rene Perzo
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Individual
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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H7/00—Construction or assembling of bulk storage containers employing civil engineering techniques in situ or off the site
    • E04H7/02—Containers for fluids or gases; Supports therefor

Definitions

  • This invention relates to an elevated reservoir having a large capacity.
  • the storage reservoirs may be built on the shore. When this is not the case, the storage reservoirs are commonly submerged near the wells.
  • the present invention which is the result of extensive research, relates to an elevated reservoir of large capacity, which has the necessary strength, and which may be built at a cost sufficiently low to render its use economically feasible.
  • an elevated reservoir supported on pilings which is characterized by the fact that it comprises a group of supports, each of which consists of at least one pile. These supports are regularly distributed beneath the body of the reservoir and connected to each other by a platform which distributes the horizontal forces applied to each of them among all the supports while being adaptable to slight vertical displacements of the supports which may result from sinking of the ground on which the piles rest.
  • the body of the reservoir proper may be, for example, a cylindrical chamber made of metal plates resting directly on the platform.
  • the essential characteristic of the invention consists in building on the supports constituted by the piles a platform which has the ability to connect the supports so that they act as a unit to resist horizontally applied forces.
  • each support consists of a group of piles inclined with respect to the vertical so as to resist horizontally applied forces and converging substantially to a point at the level of the platform.
  • each support consists of two piles inclined to form an A, the tops of the piles being connected side by side (with respect to the plane of the A) substantially at the level of the platform.
  • the supports are uniformly distributed in a grid of squares. Moreover, the planes of the piles which constitute the different supports are alternately positioned parallel to each of the sides of the grid formed by the supports.
  • the plane of the piles is slightly inclined with respect to the directions of the network so as to prevent the two piles from interfering with each other.
  • the piles may be made in any way. However, it is particu larly advantageous to make the piles of prestressed concrete, according to the technique which consists of first boring a hole to receive the piles, using a metallic sleeve, and then introducing tubular concrete members, which are prestressed and constitute the pile after retraction of the metallic sleeve.
  • the platform is made from boxes which are square in section, mounted on the tops of the piles constituting the supports and attached to the tops of these piles by means of concrete while being connected to each other by vertical concrete ribs in alignment with their sides.
  • the dimensions of the square boxes prefferably be such that the width of the boxes corresponds substantially to the distance separating each two boxes.
  • the platform itself may be made by pouring concrete directly into the boxes, in particular at the time the box is mounted on the top of the piles.
  • the surfaces of the platform outside the boxes may advantageously consist of square prefabricated slabs which are mounted on the ribs.
  • This process has the advantage of locating each of the boxes from a starting support without applying any force to the other supports, because the pilings constituting the other supports are attached to the various boxes only after the boxes have been placed in position.
  • the tank proper may be of a conventional type. It consists, for example, of a casing of sheet steel with its bottom resting on the platform which has just been described, and having cylindrical vertical sides.
  • Elevated reservoirs may be made in this manner which have platforms capable of supporting loads up to 15,000 ing/m. and more.
  • the construction of these platforms is sufficiently inexpensive to make the use of this type of reservoir economically practical. All safety requirements are also well satisfied.
  • FIG. I is a vertical sectional view through one part of an elevated reservoir according to the invention.
  • FIG. 2 is a cross-sectional view taken along the line IIII showing one-fourth of the reservoir shown in FIG. 1, looking upward;
  • FIG. 3 is a cross-sectional view on a larger scale taken along the line III-III of FIG. 2;
  • FIG. 4 is a cross-sectional view taken along the line IV-IV of FIG. 3 before the box at the right has been attached to its supports.
  • FIGS. 1 and 2 schematically illustrate a reservoir of large volume according to the invention.
  • This reservoir is supported on pilings such as l, 1', 2, 2, the lower ends of which penetrate the submarine soil 3 passing through a sedimentary layer 4.
  • the upper ends of these pilings are high enough above the level of the sea to raise the platform above the direct effects of the waves.
  • the depth to which the piles must be driven into the submarine soil is dependent on the weight to be supported and the characteristics of the soil and may be calculated by conventional methods.
  • the piles are made by assembling tubular elements connected end to end by prestressing cables. These tubular elements are introduced through a hole produced by a tube equipped with a drill.
  • FIG. 1 also shows the platform 6, which is fastened to the tops of the piles l, 1, 2, 2', and consists of slabs 7 and vertical ribs 8.
  • the construction of the platform will be hereinafter described in a detailed manner.
  • the platform 6 supports the body 9 of the reservoir proper, which is cylindrical about a vertical axis and is made in a conventional manner from sheet steel.
  • the reservoir is 88 meters in diameter and 20 meters high, having a volume of about 120,000 mi.
  • the platform is about I2 meters above the surface of the water and the piles are about 60 meters long.
  • FIG. 2 is a schematic sectionalview taken just below the slabs 7 which shows the grid of ribs which form a square pattern.
  • This figure also shows schematically the tops of the piles l, l, 2, 2', as well as the directions of their lower parts, which are represented by arrows positioned axially of the piles.
  • the directions of the piles of each group are alternated substantially in the two directions of the grid of ribs.
  • piles, 1, 1' run substantially east-west, whereas piles 2, 2' run substantially north-south, as shown in FIG. 2.
  • the group of piles forms a plurality of lozenges since, allowing for the substantial length of the piles, the lower parts of the two piles of two adjacent supports would meet each other if the piles had been strictly parallel to the directions of the ribs.
  • the piles of a single support are not positioned in the same vertical plane but in two parallel planes so that the heads of the piles are positioned side by side and not opposite each other.
  • This characteristic makes it possible to produce a better connection between the tops of the piles and to compensate more easily for differences in the length of the piles, which appear at their upper ends.
  • FIGS. 3 and 4 show the structure of the platform 6 on which the reservoir rests.
  • the platfonn is made from prefabricated boxes 10 which, as may be seen on FIGS. 2 and 3, consist of four equal sides 11 which are attached to each other and connected by a bottom 12 which is provided with an elongated opening 13 large enough to receive the upper parts of the pile l, l, or 2, 2', forming a single support.
  • the sides 11 project slightly toward the outside at 11' to meet the ribs 8 which are positioned in alignment with the sides 11 and serve to connect two adjacent boxes.
  • the pilings of a first support are first placed in position.
  • a first box (for example box A in FIGS. 3 and 4) is then positioned and held in place while the concrete 14 is poured to connect the two upper ends of the piles l and l and seat the box A on these piles.
  • the concrete 14 is H shaped in plan and the middle bar of the II is positioned substantially along the line connecting the median points of the upper ends of the piles.
  • the opening 13 in casing A (which is not shown for greater clarity on FIG. 4) is longest in the direction of the transverse bar of the H of the concrete.
  • the slab 15 (FIG. 3) is then put in position and closes the upper part of the casing while constituting part of the platform.
  • the two piles 2, 2' are then put in position to constitute a second support.
  • Two prefabricated ribs 8 (FIG. 4) are then mounted in a conventional manner in alignment with the two parallel sides 11 of the box A, using prestressing cables 16 which pass through both the sides 11 and the ribs 8.
  • a box B is then positioned in alignment with the ribs 8, (for example using aderrick resting on the slab l5).
  • Prestressing cables 16 are used for this purpose. This results in an accurate positioning of the box B with respect to the box A since the various components of the boxes and the ribs 8 are placed under stress.
  • FIG. 4 shows the platform before the concrete has been added to box B
  • FIG. 3 shows it after concrete has been added to box B).
  • Method of manufacturing a support for a reservoir which comprises the steps of emplacing a plurality of piles to form a first support, positioning a first box on this support, fastening this box to the ends of the piles constituting said first support, covering the top of this first box, emplacing a plurality of piles to form a second support adjacent the first, positioning two prefabricated ribs in alignment with two sides of the first box which extend in the direction of the second support and attaching them to the first box by means of prestressing cables, attaching a second box to the end of these ribs by means of prestressing cables, fastening the second box to the upper ends of the piles constituting the second support, mounting a prefabricated platform component on the ribs between the two boxes and thus proceeding step by step to complete the structure.
  • Method as claimed in claim 1 comprising the steps of attaching said boxes to said piles with concrete.
  • Pile-supported elevated reservoir comprising:
  • prefabricated ribs in alignment with the sides of said boxes and connecting adjacent boxes
  • prestressing means extending longitudinally through the sides of said boxes and the ribs aligned therewith.
  • each of said boxes receives the ends of at least two piles, the piles of each box being inclined with respect to the vertical, and converging at the level of said box.
  • each of said boxes contains concrete surrounding the upper end of a pile therein.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Revetment (AREA)
US34060A 1969-05-05 1970-05-04 Elevated reservoir for use with off-shore oil wells Expired - Lifetime US3648466A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR6912401A FR2043876A5 (fr) 1969-05-05 1969-05-05

Publications (1)

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US3648466A true US3648466A (en) 1972-03-14

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US34060A Expired - Lifetime US3648466A (en) 1969-05-05 1970-05-04 Elevated reservoir for use with off-shore oil wells

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US (1) US3648466A (fr)
FR (1) FR2043876A5 (fr)
OA (1) OA03265A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3974657A (en) * 1972-04-13 1976-08-17 Sumner Maurice N Modular offshore structure system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2776471A (en) * 1952-01-09 1957-01-08 Preload Co Inc Method of erecting prestressed floor sections
US3173226A (en) * 1962-01-10 1965-03-16 Solnick Abraham Unitary floor and roof construction and method of assembly
US3255591A (en) * 1961-08-23 1966-06-14 Thornley Beatrice Horizontally stabilized foundation
US3466878A (en) * 1966-01-17 1969-09-16 Boussiron Soc Entreprises Rig for work at sea,in lakes,lagoons

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2776471A (en) * 1952-01-09 1957-01-08 Preload Co Inc Method of erecting prestressed floor sections
US3255591A (en) * 1961-08-23 1966-06-14 Thornley Beatrice Horizontally stabilized foundation
US3173226A (en) * 1962-01-10 1965-03-16 Solnick Abraham Unitary floor and roof construction and method of assembly
US3466878A (en) * 1966-01-17 1969-09-16 Boussiron Soc Entreprises Rig for work at sea,in lakes,lagoons

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Civil Engineering (publication) of Jul. 1956 pp. 41, 42, 43. *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3974657A (en) * 1972-04-13 1976-08-17 Sumner Maurice N Modular offshore structure system

Also Published As

Publication number Publication date
FR2043876A5 (fr) 1971-02-19
OA03265A (fr) 1970-12-15

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