Floating type platform with liftable central stand column and construction method of floating type platform

Abstract

The invention provides a floating platform with a liftable central stand column and a construction method of the floating platform. The technical problem that an existing floating platform is inconvenient to tow is solved. Comprising a floating type frame and a center stand column which are coaxially arranged. The floating type frame comprises a center sleeve, the center sleeve is arranged on the outer wall of the center stand column in a sleeving mode, the center stand column can slide along the center sleeve, and a first inhaul cable is connected between the bottom end of the center stand column and the bottom end of the floating type frame. And when the floating platform is towed in place and installed, the central stand column slides downwards to the lower limit position to form a T-shaped structure with the floating frame, and the first inhaul cable is tensioned. In the towing process, the floating type structure and the bottom end of the central stand column do not rub with seabed launching, the floating type platform can be conveniently towed to a designated water area, and meanwhile the floating type platform is convenient and efficient to install.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of floating platforms, in particular to a floating platform with a center column that can be raised and lowered and a construction method thereof. BACKGROUND

[0002] The towing of a floating platform in the sea is one of the key steps in the entire construction process, and is directly related to the progress and cost control of the project. Since the platform needs to be stable and meet certain navigation requirements during towing, its draft becomes a crucial design parameter. If the draft is too deep, the platform is prone to serious accidents such as grounding and stranding when passing through relatively limited coastal areas, shallow sections of waterways, or near river mouths, which not only causes structural damage, but also may cause construction delays and environmental pollution. In addition, the deep draft state is significantly affected by tidal changes, further increasing the time window restrictions and operation difficulty of passing through shallow water areas.

[0003] Therefore, how to achieve rapid and safe towing and precise installation of a floating platform has become a technical problem to be solved in the field of offshore engineering. Specifically, it is necessary to consider multiple aspects such as towing resistance optimization, attitude adjustment, temporary ballast water configuration, and dynamic coordination with tides and weather conditions. SUMMARY

[0004] The purpose of the present application is to provide a floating platform with a center column that can be raised and lowered and a construction method thereof. To solve the technical problem of the inconvenience of towing the existing floating platform.

[0005] A floating platform with a center column that can be raised and lowered, comprising a coaxially arranged floating frame and a center column;

[0006] The floating frame comprises a center sleeve, which is sleeved on the outer wall of the center column. The center column can slide along the center sleeve. A first cable is connected between the bottom end of the center column and the bottom end of the floating frame. When the floating platform is towed, the center column slides upward to the upper limit position and forms an inverted T-shaped structure with the floating frame. When the floating platform is installed in place, the center column slides downward to the lower limit position and forms a T-shaped structure with the floating frame, and the first cable is tensioned.

[0007] Optionally, the top end of the center column and the center sleeve is provided with a flange plate;

[0008] A plurality of vertical screws are installed on the flange plate at the top end of the center sleeve, and the plurality of vertical screws are arranged in an annular array along the center sleeve. A plurality of screw through holes corresponding to the vertical screws are formed in the flange plate at the top end of the center column.

[0009] When the center column slides down to the lower limit position, the top end of the vertical screw rod passes through the screw rod through hole, and a locking nut is threadedly connected to the vertical screw rod at the top end of the center column and abuts against the top end surface of the center column.

[0010] Optionally, a ballast block is mounted at the bottom end of the center column.

[0011] When the center column and the floating frame form an inverted T-shaped structure, the center column and the center sleeve are limited by a temporary limiting mechanism, and when the floating platform is installed in place, the temporary limiting mechanism is removed, and the center column slides down to the lower limit position.

[0012] Optionally, the floating frame further comprises a support ring and a buoyancy ring.

[0013] The support ring is located above the buoyancy ring, and the support ring and the buoyancy ring are coaxially arranged with the center sleeve, and a plurality of edge columns are arranged between the support ring and the buoyancy ring.

[0014] Optionally, a plurality of second cables are tensioned and connected between the support ring and the bottom end of the center sleeve.

[0015] A plurality of third cables are tensioned and connected between the buoyancy ring and the top end of the center sleeve, and the plurality of second cables and the plurality of third cables are arranged in a ring array along the axis of the center sleeve.

[0016] Optionally, a plurality of support spokes are connected between the support ring and the top end of the center sleeve.

[0017] A plurality of reinforcing spokes are connected between the buoyancy ring and the bottom end of the center sleeve, and the plurality of support spokes and the plurality of reinforcing spokes are arranged in a ring array along the axis of the center sleeve.

[0018] Optionally, a ring-shaped gravity anchor arranged on the bottom of the water is further included.

[0019] When the center column slides down to the lower limit position, a plurality of anchor chains are connected between the ring-shaped gravity anchor and the bottom end of the center column, and the plurality of anchor chains are arranged in a ring array along the axis of the center column.

[0020] Optionally, a lifting adjustment cable is further included, one end of the lifting adjustment cable is connected to the ballast block, and the other end of the lifting adjustment cable passes through a flange plate at the top end of the center sleeve and is connected to a winding mechanism.

[0021] Optionally, when the floating platform is towed, a plurality of temporary cables are connected between the top end of the center column and the support ring, and the plurality of temporary cables are arranged in a ring array along the axis of the center column.

[0022] A construction method of a center column liftable floating platform, which adopts the center column liftable floating platform, and specifically comprises the following steps:

[0023] S1: structure assembly: assemble the floating frame and insert the center column into the center sleeve, drive the center column to slide upward to the upper limit position to form an inverted T-shaped structure with the floating frame, and limit by a temporary limiting mechanism; connect one end of the anchor chain to the ring-shaped gravity anchor, and tie a temporary rope on the other end of the anchor chain;

[0024] S2: towing: tow the floating frame, the center column and the ring-shaped gravity anchor to the predetermined position, and lower the ring-shaped gravity anchor to the bottom of the water;

[0025] S3: lowering and installation: remove the temporary cable and the temporary limiting mechanism, and slide the center column downward to the lower limit position, and install the locking nut to fix the center column;

[0026] S4: anchor chain installation: by the traction of the temporary rope at the other end of the anchor chain, the other end of the anchor chain passes through the ballast block and is installed at the bottom end of the center column;

[0027] S5: platform towing: when the floating platform needs to be towed or recovered, the winding mechanism winds the lifting adjusting rope, and the center column is lifted upward to the upper limit position.

[0028] Due to the adoption of the above technical scheme, the application has the following advantages:

[0029] 1. The center column liftable floating platform is provided, the center column of the floating structure slides upward to the upper limit position to form an inverted T-shaped structure with the floating frame, and is limited by a temporary limiting mechanism, the overall draft of the structure is shallow, the floating structure and the bottom end of the center column will not be scratched with the seabed during towing, and the floating platform is convenient to tow to the specified water area.

[0030] 2. The floating mechanism of the floating platform is assembled on the shore, when the floating platform is installed after being towed to the position, the temporary limiting mechanism is removed, the center column slides downward to the lower limit position to form a T-shaped structure with the floating frame, the first cable is tensioned under the action of the center column and the ballast block, the installation of the floating platform is convenient and efficient, and the setting of the center column improves the stability of the floating platform in water.

[0031] 3. The temporary cable is arranged to improve the stability of the center column during towing, and the lifting adjusting rope is arranged, when the floating platform needs to be towed or recovered, the winding mechanism winds the lifting adjusting rope, the center column is lifted upward to the upper limit position, and the floating platform is convenient to recover and tow.

[0032] Additional advantages, objects, and features of the application will be apparent from the following description, taken in conjunction with the accompanying drawings. The above-mentioned and other advantages and features of the application will be more clearly understood from the following specification, which proceeds with reference to the following figures. BRIEF DESCRIPTION OF DRAWINGS

[0033] The drawings accompanying the specification are included to provide a further understanding of the application. They are incorporated by reference and constitute part of this specification.

[0034] Figure 1 Structure diagram of the floating platform when the central column slides to the upper limit position.

[0035] Figure 2 Structure diagram of the floating platform when the central column slides to the lower limit position.

[0036] Figure 3 Structure diagram of the floating frame of the application.

[0037] Figure 4 Structure diagram of the upper part of the central column and the central sleeve.

[0038] Figure 5 Structure diagram of the central column, ballast block, ring-shaped gravity anchor, and anchor chain.

[0039] In the figure: 1-central column; 2-central sleeve; 3-first inhaul; 4-vertical screw rod; 5-screw rod through hole; 6-locking nut; 7-ballast block; 8-support ring; 9-buoyancy ring; 10-side column; 11-second inhaul; 12-third inhaul; 13-support spoke; 14-strengthening spoke; 15-ring-shaped gravity anchor; 16-anchor chain; 17-lifting adjustment cable; 18-temporary inhaul. DETAILED DESCRIPTION

[0040] The application will be further described below in conjunction with the drawings and examples.

[0041] Example 1:

[0042] As shown in Figure 1 , Figure 2 and Figure 3 , a central column-liftable floating platform includes a coaxially arranged floating frame and a central column 1;

[0043] The floating frame comprises a center sleeve 2 sleeved on the outer wall of the center column 1, the center column 1 is slidable along the center sleeve 2, and a first cable 3 is connected between the bottom end of the center column 1 and the bottom end of the floating frame; when the floating platform is towed, the center column 1 slides upward to an upper limit position to form an inverted T-shaped structure with the floating frame; when the floating platform is installed in place, the center column 1 slides downward to a lower limit position to form a T-shaped structure with the floating frame and the first cable 3 is tensioned.

[0044] As shown in Figure 2 and Figure 5 , the bottom end of the center column 1 is provided with a ballast block 7;

[0045] When the center column 1 and the floating frame form an inverted T-shaped structure, the center column 1 and the center sleeve 2 are limited by a temporary limiting mechanism; when the floating platform is installed in place, the temporary limiting mechanism is removed, and the center column 1 slides downward to the lower limit position.

[0046] In this embodiment, the center column 1 slides upward to the upper limit position to form an inverted T-shaped structure with the floating frame, and is limited by the temporary limiting mechanism; during towing, the floating frame and the bottom end of the center column will not scratch the seabed, which facilitates towing to the designated water area. When the floating frame of the floating platform is assembled on the shore, the temporary limiting mechanism is removed when the floating platform is installed in place, and the center column 1 slides downward to the lower limit position to form a T-shaped structure with the floating frame. The first cable 3 is tensioned under the action of the center column 1 and the ballast block 7, the installation of the floating platform is convenient and efficient, and the setting of the center column improves the stability of the floating platform in water.

[0047] As an embodiment of the present application, the temporary limiting mechanism is a limiting groove (not shown in the figure) on the center column 1 and a limiting screw (not shown in the figure) installed on the outer wall of the center sleeve 2 and arranged in the radial direction; when the center column 1 slides upward to the upper limit position, the limiting groove and the limiting screw are at the same height, the front end of the limiting screw is inserted into the limiting groove to achieve temporary limiting; in this embodiment, the number of limiting screws is two or more.

[0048] In this embodiment, the ballast block 7 drives the center column 1 to descend in place by its own weight, and simultaneously realizes the tensioning of the first cable 3; at the same time, the ballast block 7 greatly reduces the gravity center of the overall structure of the floating platform, and makes the gravity center lower than the buoyancy center, forming a ballast stabilizing structure similar to the SPAR structure, which is a floating not-falling-over-Tu form on water; when the floating structure shakes, the ballast block and the center column also swing and agitate the surrounding water, forming a large damping, which can suppress the shaking of the floating body.

[0049] As shown in Figure 1 ,Figure 2 、 Figure 3 and Figure 4 As shown in the drawings, the top end of the central column 1 and the central sleeve 2 are provided with flanges;

[0050] A plurality of vertical screw rods 4 are installed on the flange at the top end of the central sleeve 2, and the plurality of vertical screw rods 4 are arranged in an annular array along the central sleeve 2. A plurality of screw rod through holes 5 corresponding to the vertical screw rods 4 are formed on the flange at the top end of the central column 1.

[0051] When the central column 1 slides downward to the lower limit position, the top end of the vertical screw rod 4 passes through the screw rod through hole 5, and the vertical screw rod 4 at the top end of the central column 1 is threadedly connected with a locking nut 6, and the locking nut 6 is in abutment with the top end face of the central column 1.

[0052] In this embodiment, when the central column 1 slides downward to the lower limit position, the locking nut 6 is used to fix the central column 1, and by applying a certain locking force to the locking nut 6, the first cable 3 is further tensioned.

[0053] As shown in the drawings, Figure 1 、 Figure 2 and Figure 3 The floating frame further comprises a support ring 8 and a buoyancy ring 9.

[0054] The support ring 8 is located above the buoyancy ring 9, and the support ring 8 and the buoyancy ring 9 are coaxially arranged with the central sleeve 2. A plurality of edge columns 10 are arranged between the support ring 8 and the buoyancy ring 9, and the plurality of edge columns 10 are arranged in an annular array along the central sleeve 2.

[0055] As shown in the drawings, Figure 1 、 Figure 2 and Figure 3 A plurality of second cables 11 are connected in tension between the support ring 8 and the bottom end of the central sleeve 2.

[0056] A plurality of third cables 12 are connected in tension between the buoyancy ring 9 and the top end of the central sleeve 2, and the plurality of second cables 11 and third cables 12 are arranged in an annular array along the central sleeve 2.

[0057] As shown in the drawings, Figure 1 、 Figure 2 and Figure 3 A plurality of support spokes 13 are connected between the support ring 8 and the top end of the central sleeve 2.

[0058] A plurality of reinforcing spokes 14 are connected between the buoyancy ring 9 and the bottom end of the central sleeve 2, and the plurality of support spokes 13 and reinforcing spokes 14 are arranged in an annular array along the central sleeve 2.

[0059] In the embodiment, the center sleeve 2, the support ring 8, the buoyancy ring 9, the edge column 10, the second cable 11, the third cable 12, the support spoke 13 and the reinforcing spoke 14 are installed, tensioned and assembled, the buoyancy ring 9 includes a plurality of arc segments including a skeleton and an outer shell and filled foam arranged in the skeleton and the outer shell, when towing, the buoyancy ring 9 provides buoyancy for the floating platform, the buoyancy ring 9 is arranged below the support ring 8, when the floating platform is towed, the floating mechanism is mostly floating on the water surface, which is convenient for towing. In the embodiment, the first cable 3, the second cable 11 and the third cable 12 are all carbon fiber cables, and the support spoke 13 and the reinforcing spoke 14 can be any one of a steel pipe, a truss and a cable.

[0060] In the embodiment, the floating frame forms a floating cable net structure by itself, and can work independently as a semi-submersible floating structure, the second cable 11 and the third cable 12 are arranged in a cross manner, and the cable inclination is relatively large, which helps to improve the vertical stiffness of the sleeve type center column 1 and facilitate the safety reserve of the structure in hoisting construction.

[0061] As shown in Figure 2 and Figure 5 , the ring-shaped gravity anchor 15 arranged on the water bottom is further included;

[0062] When the center column 1 slides downward to the lower limit position, a plurality of anchor chains 16 are connected between the ring-shaped gravity anchor 15 and the bottom end of the center column 1, and the plurality of anchor chains 16 are arranged in a ring array along the axis of the center column 1.

[0063] In the embodiment, one end of the plurality of anchor chains 16 is connected to the ring-shaped gravity anchor 15 on the shore, and a temporary rope is tied to the other end of the anchor chain 16, when the floating platform is installed at sea, the floating frame, the center column 1 and the ring-shaped gravity anchor 15 are first towed to the predetermined position, and the ring-shaped gravity anchor 15 is lowered to the water bottom, when the center column 1 slides downward to the lower limit position, the other end of the anchor chain 16 is pulled by the temporary rope, so that the other end of the anchor chain 16 penetrates through the ballast block 7 and is installed to the bottom end of the center column 1. In the embodiment, the diameter of the ballast block 7 is larger than the outer diameter of the center column 1, the ballast block 7 is arranged in a ring array, and a through hole for the anchor chain 16 to penetrate is arranged, the other end of the anchor chain 16 is hinged to the lug on the outer wall of the bottom end of the center column 1 after being pulled by the temporary rope, and the depth of the floating frame submerged in the water and the use of different depth of the sea bottom can be realized by adjusting the length of the anchor chain 16.

[0064] As shown in Figure 1 and Figure 2 , the lifting adjusting cable 17 is further included, one end of the lifting adjusting cable 17 is connected to the ballast block 7, and the other end of the lifting adjusting cable 17 penetrates through the flange at the top end of the center sleeve 2 and is connected to the winding mechanism.

[0065] In the embodiment, the winding mechanism is a winch, which is installed on a support ring 8 (not shown in the figure) and a guide wheel (not shown in the figure) is installed on a flange plate at the top end of the central sleeve 2. When the limiting mechanism needs to be installed, the winch and the lifting adjustment cable 17 are used to lift the central column 1 and the ballast block 7 to a predetermined position, and then the limiting screw is installed. When the limiting mechanism needs to be removed, the winch is used to tighten the lifting adjustment cable 17, and then the limiting screw is removed. The installation and removal of the limiting screw are convenient. After the limiting screw is installed, the central column 1 and the ballast block 7 are slowly lowered by lowering the lifting adjustment cable 17, so as to avoid the instantaneous impact caused by the excessive speed, and the first cable 3 is effectively prevented from being pulled out or broken. In the embodiment, when the floating platform needs to be towed or recovered, the winding mechanism winds the lifting adjustment cable 17, and the central column 1 is lifted to the upper limit position, so as to facilitate the recovery and towing of the floating platform.

[0066] As shown in Figure 2 the embodiment, when the floating platform is towed, a plurality of temporary cables 18 are connected between the top end of the central column 1 and the support ring 8. The plurality of temporary cables 18 are arranged in a ring array along the axis of the central column 1.

[0067] In the embodiment, the temporary cables 18 are used to strengthen the stability of the central column during the lifting and towing of the floating platform.

[0068] Embodiment 2

[0069] A construction method of a floating platform with a liftable central column, which adopts the floating platform with a liftable central column in the embodiment 1. The specific steps are as follows.

[0070] S1: structure assembly: assemble the floating frame, insert the central column 1 into the central sleeve 2, drive the central column 1 to slide upward to the upper limit position to form an inverted T-shaped structure with the floating frame, and limit the structure by the temporary limiting mechanism; connect one end of the anchor chain 16 to the ring-shaped gravity anchor 15, and tie a temporary rope to the other end of the anchor chain 16;

[0071] S2: towing: tow the floating frame, the central column 1 and the ring-shaped gravity anchor 15 to a predetermined position, and lower the ring-shaped gravity anchor 15 to the bottom of the water;

[0072] S3: lowering and installation: remove the temporary cable 18 and the temporary limiting mechanism, and slide the central column 1 downward to the lower limit position, and install the locking nut 6 to fix the central column 1;

[0073] S4: installation of anchor chain: use the temporary rope at the other end of the anchor chain 16 to pull the other end of the anchor chain 16 through the ballast block 7 and install it to the bottom end of the central column 1;

[0074] S5: Platform Towing: When the floating platform needs to be towed or recovered, the winding mechanism winds the lifting adjusting rope 17, and the central column 1 is lifted upward to the upper limit position.

[0075] In the embodiment, the assembling process of step S1 is completed on the shore.

[0076] In summary, the floating platform of the present application has the advantages of convenient towing and convenient installation and maintenance, and the floating structure has low gravity center and strong anti-disturbance ability, which improves the stability and service life of the floating platform on the sea.

[0077] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit it. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that the specific embodiments of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the present application. Any modification or equivalent replacement without departing from the spirit and scope of the present application should be covered in the protection scope of the claims of the present application.

Claims

1. A floating platform with a central, liftable column, characterized in that, Includes a coaxially arranged floating frame and a central column (1); The floating frame includes a central sleeve (2), which is sleeved on the outer wall of the central column (1). The central column (1) can slide along the central sleeve (2). A first cable (3) is connected between the bottom end of the central column (1) and the bottom end of the floating frame. When the floating platform is towed, the central column (1) slides upward to the upper limit position and forms an inverted T-shaped structure with the floating frame. When the floating platform is towed into place for installation, the central column (1) slides downward to the lower limit position and forms a T-shaped structure with the floating frame, and the first cable (3) is tensioned.

2. The floating platform with a liftable central column according to claim 1, characterized in that, The top of both the central column (1) and the central sleeve (2) are provided with flanges; A number of vertical screws (4) are installed on the flange at the top of the central sleeve (2). The number of vertical screws (4) are arranged in a ring array along the central sleeve (2). A number of screw through holes (5) corresponding to the vertical screws (4) are opened on the flange at the top of the central column (1). When the central column (1) slides down to the lower limit position, the top end of the vertical screw (4) passes through the screw through hole (5), and a locking nut (6) is threaded on the vertical screw (4) at the top end of the central column (1), and the locking nut (6) abuts against the top surface of the central column (1).

3. A floating platform with a liftable central column according to claim 1 or 2, characterized in that, A ballast block (7) is installed at the bottom of the central column (1); When the central column (1) and the floating frame form an inverted T-shaped structure, the central column (1) and the central sleeve (2) are limited by a temporary limiting mechanism. When the floating platform is towed into place for installation, the temporary limiting mechanism is removed and the central column (1) slides down to the lower limit position.

4. A floating platform with a liftable central column according to claim 1, characterized in that, The floating frame also includes a support ring (8) and a buoyancy ring (9); The support ring (8) is located above the buoyancy ring (9). The support ring (8) and the buoyancy ring (9) are coaxially arranged with the central sleeve (2). A number of side columns (10) are arranged between the support ring (8) and the buoyancy ring (9). The number of side columns (10) are arranged in a circular array along the axis of the central sleeve (2).

5. A floating platform with a liftable central column according to claim 4, characterized in that, A number of second cables (11) are tensioned between the support ring (8) and the bottom end of the central sleeve (2); The buoyancy ring (9) is tensioned to the top of the central sleeve (2) by a number of third cables (12), and a number of second cables (11) and third cables (12) are arranged in a ring array along the axis of the central sleeve (2).

6. A floating platform with a liftable central column according to claim 4 or 5, characterized in that, A number of support spokes (13) are connected between the support ring (8) and the top of the central sleeve (2); A number of reinforcing spokes (14) are connected between the buoyancy ring (9) and the bottom end of the central sleeve (2). A number of supporting spokes (13) and reinforcing spokes (14) are arranged in a ring array along the axis of the central sleeve (2).

7. A floating platform with a liftable central column according to claim 1, characterized in that, It also includes an annular gravity anchor (15) set on the bottom of the water; When the central column (1) slides down to the lower limit position, a number of anchor chains (16) are connected between the annular gravity anchor (15) and the bottom end of the central column (1), and the number of anchor chains (16) are arranged in a ring array along the axis of the central column (1).

8. A floating platform with a liftable central column according to claim 3, characterized in that, It also includes a lifting adjustment cable (17), one end of which is connected to the ballast block (7), and the other end of which passes through the flange at the top of the central sleeve (2) and is connected to the winding mechanism.

9. A floating platform with a liftable central column according to claim 1, characterized in that, When the floating platform is towed, a number of temporary cables (18) are connected between the top of the central column (1) and the support ring (8), and the number of temporary cables (18) are arranged in a ring array along the axis of the central column (1).

10. A construction method for a floating platform with a liftable central column, characterized in that, The floating platform with a liftable central column as described in any one of claims 1-9 comprises the following steps: S1: Structural assembly: Assemble the floating frame and insert the central column (1) into the central sleeve (2), drive the central column (1) to slide upward to the upper limit position to form an inverted T-shaped structure with the floating frame, and limit it through a temporary limiting mechanism; connect one end of several anchor chains (16) to the annular gravity anchor (15), and tie a temporary rope to the other end of the anchor chains (16); S2: Towing: Towing the floating frame, central column (1) and annular gravity anchor (15) to the predetermined position and lowering the annular gravity anchor (15) to the bottom of the water; S3: Lowering Installation: Release the temporary cable (18) and the temporary limiting mechanism, slide the central column (1) down to the lower limit position, and install the locking nut (6) to fix the central column (1); S4: Install anchor chain: With the help of the temporary rope at the other end of the anchor chain (16), the other end of the anchor chain (16) is passed through the ballast block (7) and installed at the bottom of the central column (1); S5: Platform towing: When the floating platform needs to be towed or retrieved, the winding mechanism winds up the lifting adjustment cable (17) to raise the central column (1) to the upper limit position.

Images