CN115075117A

CN115075117A - Trestle structure for offshore platform

Info

Publication number: CN115075117A
Application number: CN202210633300.8A
Authority: CN
Inventors: 史政; 刘蒙; 江锐
Original assignee: China Energy Engineering Group Guangdong Electric Power Design Institute Co Ltd
Current assignee: China Energy Engineering Group Guangdong Electric Power Design Institute Co Ltd
Priority date: 2022-06-06
Filing date: 2022-06-06
Publication date: 2022-09-20

Abstract

The invention relates to the technical field of ocean engineering, and discloses a trestle structure for an offshore platform, which comprises two groups of trestle segments and a connecting cantilever, wherein each trestle segment comprises a base and a trestle body vertically and rotatably assembled on the base, a driving assembly for driving the trestle body to rotate is further arranged on the base, the connecting cantilever is arranged on the trestle bodies of the trestle segments, the connecting cantilever is connected with the two groups of trestle bodies when the trestle bodies rotate to be horizontal, and the trestle bodies are detachably connected with the base when the trestle bodies rotate to be highest. Each trestle is installed on a platform to be connected in a segmented manner, so that the load on each platform is reduced, and the platform cost is reduced; the trestle segments and the platform to be installed are transported synchronously after being preassembled, so that the trestle segments do not need to be transported independently, and marine transportation tooling and time are reduced; the landing stage body is connected or breaks off through connecting cantilever and platform by the drive assembly drive, need not carry out dismouting landing stage operation with the help of marine floating crane, has saved marine activity duration, has reduced the dismouting expense of landing stage.

Description

Trestle structure for offshore platform

Technical Field

The invention relates to the technical field of ocean engineering, in particular to a trestle structure for an offshore platform.

Background

When the ocean platform is nearer to the coast, for offshore operation is more convenient, the trestle is generally adopted for connection, and workers are supplied for operation. The trestle of commonly using includes types such as integral type trestle, telescopic trestle, and the integral type trestle adopts the hoist and mount installation, finishes at two platform installations after, adopts the floating crane hoist and mount installation, and installation cost is very high, and simultaneously after the platform is in service, need adopt marine floating crane to demolish the trestle, the expense of demolising is high.

The telescopic trestle is generally fixed on a main platform of an ocean platform, and is carried on a platform on the coast after being extended when needed. For example, the patent with the publication number of CN201588168U discloses a multifunctional self-elevating support platform pedestrian hydraulic telescopic trestle for offshore oil fields, which comprises a base, a slewing bearing with an inner gear ring installed on the base, an output gear and a hydraulic motor thereof installed in the base and meshed with the inner gear ring, a portal installed on the slewing bearing, a guide wheel group installed on the upper end of the portal, a fixed bridge section hinged on the slewing bearing, guide wheel groups installed on both sides of the bottom of the fixed bridge section, a traction steel wire rope installed on the guide wheel group of the portal and the fixed bridge section, and a winch installed on the portal and used for winding and unwinding the steel wire rope, wherein the fixed bridge section is a rectangular frame, an extensible telescopic bridge section is movably installed in the fixed bridge section, the telescopic bridge section is a rectangular frame, the upper, lower, left and right corners in the fixed bridge section are provided with 4 parallel guide rails, and rollers rolling along the guide rails are correspondingly installed at the upper, lower, left and right corners of the telescopic bridge section, the rack parallel with the guide rail is installed to flexible bridge joint bottom both sides, and fixed bridge joint front end bottom is installed the drive shaft, installs the gear with rack toothing on the drive shaft, installs the hydraulic motor of drive shaft on the fixed bridge joint.

The platform trestle adopts a telescopic structure, the base of the platform trestle is fixed on a main platform of the ocean platform, and the telescopic bridge extends from the fixed bridge section when needed. The length of the telescopic trestle is only about 50% of the length of the trestle in the working process when the telescopic trestle is not installed, the length of the telescopic trestle after the telescopic trestle is stretched out in the working process after the telescopic trestle is installed generally reaches 20-30 meters, all the weight of the telescopic trestle is borne by a main platform on an ocean platform, the telescopic trestle is used as a cantilever structure to bear a large load on the main platform, the stress of the main platform is greatly influenced, a strong supporting structure needs to be specially designed for the telescopic trestle, the economy of the main platform is poor, and the occupied space is large.

Disclosure of Invention

The purpose of the invention is: the utility model provides a landing stage structure for offshore platform to solve the integral type hanging bridge dismouting expense among the prior art high, the problem that flexible landing stage is loaded greatly to the main platform.

In order to achieve the purpose, the invention provides a trestle structure for an offshore platform, which comprises two groups of trestle segments and a connecting cantilever for connecting the two groups of trestle segments, wherein the trestle segments are assembled on two platforms to be connected, each trestle segment comprises a base and a trestle body which is rotatably assembled on the base around a horizontal axis, a driving component which is in transmission connection with the trestle body to drive the trestle body to rotate is further uniformly arranged on each base, the connecting cantilever is arranged on the trestle body of one group of trestle segments, and the connecting cantilever is connected with the two groups of trestle bodies when the trestle body rotates downwards to the horizontal position, and the trestle body is detachably connected with the base when the trestle body rotates upwards to the highest point.

Preferably, the definition the one end of landing stage body is the overhang end, the other end is the stiff end, the top of the stiff end of landing stage body with the base rotates the assembly, the height of landing stage body is followed the stiff end extremely the overhang end reduces gradually.

Preferably, the net height of the overhanging end of the trestle body is not less than 2.2m, and the height of the fixed end is not less than 4 m.

Preferably, the top of the stiff end of landing stage body is provided with fixed shackle, the landing stage body passes through fixed shackle with the base rotates the assembly, the fixed joint who is used for with base releasable connection is arranged to the bottom of the stiff end of landing stage body.

Preferably, the connecting cantilever comprises a fixed arm fixedly assembled on the trestle body and a folding arm hinged to the fixed arm through a hinge, and the fixed arm is of an inclined structure which gradually rises along the direction far away from the trestle body.

Preferably, still arranged the transportation on the landing stage body and broken out, arranged on the base be used for with transportation break out releasable connection's transportation connects, when the landing stage body is in the peak the transportation break out with transportation connects releasable connection.

Preferably, the vertical projection of the transportation joint is located outside the connection point of the trestle body and the base, and the included angle between the connection point of the trestle body and the base and the included angle between the connection point of the transportation joint and the vertical plane are greater than 2 °.

Preferably, the driving assembly comprises anchor machines arranged on the base and anchor chains connected with the anchor machines and the trestle body, two groups of anchor machines are arranged, and the anchor chains are in one-to-one correspondence with the anchor machines.

Preferably, the landing stage body is kept away from the one end top of base has still arranged the installation and has been broken out, the anchor chain with the installation is broken out and is connected.

Compared with the prior art, the trestle structure for the offshore platform has the following beneficial effects: the trestle structure is formed by two groups of trestle segments and connecting cantilevers, the volume and the weight of each trestle segment are only about half of the mass of the total trestle, and each trestle segment is arranged on a platform to be connected, so that the load on each platform is reduced, the structural strength of the platform during construction can be reduced, and the platform cost is reduced; the two trestle segments can be manufactured independently, the trestle segments can be preassembled with a platform to be installed when being built on the land, the trestle body is positioned at the highest point, the trestle segments and the platform to be installed are preassembled and then synchronously transported, the trestle segments do not need to be transported independently, and marine transportation tools and time are reduced; when the landing stage is required to be connected on the sea, the landing stage body is driven by the driving assembly to be unfolded and then is in a horizontal position, the landing stage body can be connected through the connecting cantilever, the landing stage body can be driven to be at the highest point through the driving assembly after the service of the platform is finished, the landing stage is disconnected, the landing stage is segmented and recovered, the landing stage is not required to be disassembled and assembled by means of a floating crane on the sea, the time of the operation on the sea is saved, and the disassembling and assembling cost of the landing stage is reduced.

Drawings

FIG. 1 is a schematic structural view of a trestle structure for an offshore platform of the invention;

FIG. 2 is a schematic illustration of the landing stage structure for an offshore platform of FIG. 1 in an assembled state on land;

FIG. 3 is a schematic view of the trestle structure for an offshore platform of FIG. 1 illustrating the included angle between the trestle body and the vertical plane during land assembly;

FIG. 4 is a schematic view of the landing stage structure for an offshore platform of FIG. 1 in an installed state;

FIG. 5 is an expanded state view of the connecting cantilevers of the landing stage structure for an offshore platform of FIG. 1;

fig. 6 is a different state diagram of the folding arm of the trestle structure for an offshore platform of fig. 1.

In the figure, 1, a trestle body; 2. a base; 3. connecting a cantilever; 31. a fixed arm; 32. a folding arm; 4. fixing and disassembling the shackle; 5. fixing the joint; 6. transporting and shackle; 7. a transport joint; 8. an anchor machine; 9. an anchor chain; 10. and (6) installing a shackle.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

The preferred embodiment of the trestle structure for the offshore platform comprises two trestle segments and a connecting cantilever 3, wherein the two trestle segments are respectively assembled and arranged on two platforms to be connected, the connecting cantilever 3 is used for connecting the two trestle segments, and the connection of the two platforms is completed through the trestle segments and the connecting cantilever 3, as shown in fig. 1 to 6.

The whole trestle structure is divided into two groups of trestle segments, and each trestle segment is arranged on a platform to be connected, so that the load on each platform is reduced, the structural strength of the platform during construction can be reduced, and the platform cost is reduced. Meanwhile, each set of trestle segments can be independently manufactured, the trestle segments can be preassembled with a platform to be installed when being built on land, the trestle segments and the platform to be installed are preassembled and then synchronously transported, the trestle segments do not need to be transported independently, and marine transportation tools and time are reduced.

The two sets of trestle segments have the same structure, and only one place is taken as an example for explanation.

Each trestle subsection all includes base 2 and trestle body 1, and base 2 is used for fixing on the platform of treating the connection, and trestle body 1 assembles on base 2. In this embodiment, base 2 and landing stage body 1 are frame construction, reduce the weight of landing stage segmentation when guaranteeing structural strength to reduce the load to the platform, reduce the structural strength of platform, the economic nature is strong.

The trestle body 1 is vertically rotatably assembled on the base 2, the driving assembly is further arranged on the base 2 and is in transmission connection with the trestle body 1, and the driving assembly is used for vertically rotating the trestle body 1 on the base 2. Connecting cantilever 3 arranges on wherein landing stage body 1 of landing stage segmentation, when two landing stage bodies 1 all rotated to the horizontality, connects two landing stage bodies 1 of cantilever 3 joinable, and two platforms are through two landing stage bodies 1, connect cantilever 3 and accomplish the connection.

When the trestle bodies 1 rotate downwards around the horizontal axis to the lowest point, the two trestle bodies 1 are in the horizontal position, the connecting cantilever 3 can be connected with the trestle bodies 1 of two trestle sections, the mounting operation of the trestle is completed, and the connection of two platforms is realized; when the trestle body 1 upwards rotates to the highest point, the trestle body 1 and the base 2 can be detachably connected, the connection between the platforms is disconnected, and the detachment and recovery of the trestle body 1 are completed.

When a landing stage is required to be connected at sea, the landing stage body 1 is driven by the driving assembly to be at the lowest point after being unfolded, the landing stage body 1 is at the horizontal position and can be connected through the connecting cantilever 3 to be completed, the landing stage body 1 can be driven by the driving assembly to be at the highest point after the service of the platform is finished, the platform is disconnected and the landing stage is recycled in a segmented mode, the operation of disassembling and assembling the landing stage by means of a floating crane at sea is not needed, the time of the operation at sea is saved, and the disassembling and assembling cost of the landing stage is reduced.

Preferably, the one end of definition landing stage body 1 is the overhang end, the other end is the stiff end, and the top and the base 2 of the stiff end of landing stage body 1 rotate the assembly, and the height of landing stage body 1 reduces to the overhang end along the stiff end gradually.

Trestle body 1 highly reduces gradually, and trestle body 1 is variable cross-section structure, reduces trestle body 1's weight under the prerequisite that the high enough personnel of guaranteeing trestle body 1 pass through the operation, reduces the load of trestle body 1 to the platform.

Preferably, the net height of the overhanging end of the trestle body 1 is not less than 2.2m, and the height of the fixed end is not less than 4 m.

The net height is the height of the overhanging end for people to walk, namely the height of a pedestrian passageway of the trestle body 1, and the requirement of 2.2m as the net height of the pedestrian passageway can meet the walking requirement of an operator; the stiff end is higher than 4m can increase the intensity of the stiff end of landing stage body 1. In this embodiment, the width of the trestle body 1 is the same as that of the existing trestle, and 4m can be selected for use. When the installation, the interval that can confirm between two landing stage bodies 1 is 1000mm, guarantees landing stage body 1 assembly, connects cantilever 3 and arranges in this interval, connects two landing stage bodies 1.

Preferably, the top of the stiff end of landing stage body 1 is provided with fixed shackle 4, and landing stage body 1 rotates the assembly through fixed shackle 4 and base 2, and the bottom of the stiff end of landing stage body 1 is arranged and is used for the fixed joint 5 with 2 releasable connection of base.

The fixed shackle 4 is fixedly arranged at the top of the fixed end of the trestle body 1, the structure is stable, and the rotating assembly relation between the trestle body 1 and the base 2 is simplified. The fixed joint 5 is detachably connected with the base 2, and when the trestle body 1 rotates to a horizontal position, the trestle body 1 can be positioned by connecting the fixed joint 5 with the base 2, so that the trestle body 1 is ensured to be stable; when the trestle is in service and needs to be dismantled, the connection relation between the fixed joint 5 and the base 2 can be dismantled, the driving assembly drives the trestle body 1 to rotate to the highest point, the connection of the two platforms is disconnected, and the dismantling operation of the trestle is completed. In the embodiment, the fixed joint 5 and the base 2 are detachably connected through a bolt and a nut.

Preferably, the connecting cantilever 3 comprises a fixed arm 31 fixedly assembled on the trestle body 1 and a folding arm 32 hinged with the fixed arm 31 through a hinge, and the fixed arm 31 is of an inclined structure gradually rising in a direction away from the trestle body 1.

The connecting cantilever 3 is formed by a fixed arm 31 and a folding arm 32, and when the trestle body 1 rotates to the highest point, the folding arm 32 can be folded on the fixed arm 31, so that the occupied space is small; when the trestle body 1 rotates to the horizontal position and needs to be connected with two trestle bodies 1, the folding arm 32 can be connected with another trestle body 1 after being unfolded. In this embodiment, the folding arm 32 is connected to the trestle body 1 by bolting after being unfolded, and in other embodiments, the folding arm 32 may also be overlapped on the trestle body 1.

The fixed arm 31 is of an inclined structure, and the connecting cantilever 3 is of a structure with a high middle part and two low sides, namely an up-down slope form. When the elevation of the platform to be connected of two trestle segments has an error, the inclined structure of the connecting fixing arm 31 can compensate the height difference, and the connection of the two trestle bodies 1 is ensured.

Preferably, still arrange transportation shackle 6 on the landing stage body 1, arrange on the base 2 be used for with transportation shackle releasable connection's transportation connect 7, transportation shackle 6 and transportation connect 7 releasable connection when landing stage body 1 is in the peak.

The transportation shackle 6 is arranged at the top of the middle of the trestle body 1, and the trestle body 1 can be connected with the transportation joint 7 on the base 2 when rotating to the highest point so as to fix the trestle body 1. The landing stage segmentation is for making alone and can adorn in advance on treating the platform of connecting, need fix landing stage body 1 when transportation platform and landing stage segmentation, and the stiff end of landing stage body 1 rotates the assembly through fixed shackle 4 and base 2 this moment, and the middle part is connected base 2 through transportation shackle 6 and transportation joint 7, can realize landing stage body 1 and base 2's interim fixed set assembly.

In addition, after the service of the trestle structure is finished, the trestle body 1 is rotated to the highest point, the base 2 and the trestle body 1 can also be connected through the transportation shackle 6 and the transportation joint 7, and the driving assembly is released without being always kept in a working state.

Preferably, the vertical projection of the transportation joint 7 is located outside the connection point of the trestle body 1 and the base 2, and the included angle between the connection point of the trestle body 1 and the base 2 and the included angle between the connection point of the transportation joint 7 and the vertical plane are greater than 2 °.

In this embodiment, when trestle body 1 is located the peak, fixed shackle 4 is compared and is in the position that is closer to base 2 in transportation shackle 6 to make and produce the contained angle between trestle body 1 and the vertical plane, the trestle body 1 of being convenient for can outwards rotate under gravity when the contained angle is greater than 2. In this embodiment, the included angle is controlled at 2-5 °, which can prevent the overlarge torque of the trestle body 1 from increasing the acting force of the driving component.

Preferably, the driving assembly comprises anchor machines 8 arranged on the base 2 and anchor chains 9 connecting the anchor machines 8 and the trestle body 1, the anchor machines 8 are arranged in two groups, and the anchor chains 9 correspond to the anchor machines 8 one by one.

Two sets of anchor machines 8 are arranged along the width direction interval of base 2, can guarantee that landing stage body 1 can not the unbalanced stress when rotating and deflect. The anchor machine 8 and the anchor chain 9 are used as driving components, and the structure of the driving components is simplified.

In this embodiment, when the anchor chain 9 is initially connected between the anchor machine 8 and the trestle body 1, the trestle body 1 is at the highest point, the transportation shackle 6 is connected with the transportation joint 7, and the anchor chain 9 is in a loose state, so that the anchor machine 8 can be debugged after the trestle is installed in place in a segmented manner.

Preferably, the top of the end of the trestle body 1 far away from the base 2 is further provided with a mounting shackle 10, and the anchor chain 9 is connected with the mounting shackle 10.

The installation shackle 10 forms the tie point of anchor chain 9 and landing stage body 1, and anchor chain 9 and installation shackle 10 releasable connection have simplified the connection structure of anchor chain 9, also are convenient for retrieve and overhaul anchor chain 9.

The manufacturing and mounting process of the trestle structure for the offshore platform comprises the first step of determining the specification and the size of each trestle segment; the second step is to build two trestle sections respectively, specifically to build two trestle sections on the land building site of two platforms to be connected, to hoist the trestle sections respectively, to complete the installation of the fixing shackle 4, and to install the connecting cantilever 3 on one trestle body 1; thirdly, mounting a transportation shackle 6 on the trestle body 1, mounting an anchor machine 8 and an anchor chain 9 on the base 2, wherein the anchor chain 9 is in a loose state, and the transportation shackle 6 of the trestle body 1 is connected with a transportation joint 7 on the base 2; fourthly, arranging the trestle on the platform in sections according to the in-place installation progress of the platform, specifically, after the platform is installed in place, debugging the anchor machine 8 to work normally, keeping the anchor machine 8 in a braking state, then releasing the connection between the transportation shackle 6 and the transportation joint 7, slowly releasing the anchor chain 9 until the fixed joint 5 is in contact with the base 2, connecting the fixed joint 5 with the base 2 through bolts, and then recovering the anchor chain 9; and fifthly, after the two trestles are installed in a segmented mode, unfolding the connecting cantilever 3 to connect the two trestle bodies 1.

In summary, the embodiment of the present invention provides a trestle structure for an offshore platform, which is formed by two sets of trestle segments and a connecting cantilever, wherein the volume and weight of each trestle segment are only about half of the total trestle mass, and each trestle segment is installed on a platform to be connected, so that the load on each platform is reduced, the structural strength of the platform during construction can be reduced, and the platform cost is reduced; the two trestle segments can be manufactured independently, the trestle segments can be preassembled with a platform to be installed when being built on the land, the trestle body is positioned at the highest point, the trestle segments and the platform to be installed are preassembled and then synchronously transported, the trestle segments do not need to be transported independently, and marine transportation tools and time are reduced; when the landing stage is required to be connected at sea, the landing stage body is driven by the driving assembly to be in a horizontal position after being unfolded, the landing stage body can be connected through the connecting cantilever and can be completed, the landing stage body can be driven to be at the highest point through the driving assembly after the service of the platform is finished, the landing stage is disconnected and the landing stage is recycled in a segmented mode, the landing stage is not required to be disassembled and assembled by means of a floating crane at sea, the time of the operation at sea is saved, and the disassembling and assembling cost of the landing stage is reduced.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a landing stage structure for offshore platform, its characterized in that, includes two sets of landing stage subsections, still including being used for connecting two sets ofly the landing stage subsection connect the cantilever, the landing stage subsection is used for assembling on two platforms of treating to connect, each the landing stage subsection all includes the base and rotates around horizontal axis and assemble landing stage body on the base, each still the equipartition put on the base with landing stage body transmission is connected in order to drive landing stage body pivoted drive assembly, it arranges a set of to connect the cantilever on landing stage subsection landing stage body, when landing stage body rotates downwards to horizontal position connect the cantilever connect two sets of landing stage body, when landing stage body upwards rotates to the peak landing stage body with base releasable connection.

2. The landing stage structure of claim 1, wherein the landing stage body is defined as an overhanging end and a fixed end, the top of the fixed end of the landing stage body is rotatably assembled with the base, and the height of the landing stage body gradually decreases from the fixed end to the overhanging end.

3. The landing stage structure of claim 2, wherein the overhanging end of the landing stage body has a clear height of not less than 2.2m and the fixed end has a height of not less than 4 m.

4. The trestle structure for offshore platforms as set forth in claim 2, wherein a fixing shackle is provided at the top of the fixed end of the trestle body, the trestle body is rotatably assembled with the base through the fixing shackle, and a fixing joint for detachable connection with the base is arranged at the bottom of the fixed end of the trestle body.

5. A trestle structure for an offshore platform according to any of claims 1-4, characterised in that the connecting cantilever comprises a fixed arm fixedly mounted on the trestle body and a folding arm hinged to the fixed arm by a hinge, the fixed arm being an inclined structure that gradually rises in a direction away from the trestle body.

6. A trestle structure for an offshore platform according to any of claims 1-4, characterised in that a transport shackle is arranged on the trestle body, a transport joint for detachable connection with the transport shackle is arranged on the base, and the transport shackle is detachably connected with the transport joint when the trestle body is at the highest point.

7. The landing stage structure of claim 6, wherein the vertical projection of the transport connector is located outside the connection point of the landing stage body and the base, and the connection point of the landing stage body and the base and the connection point of the transport connector form an angle greater than 2 ° with a vertical plane.

8. Trestle structure for offshore platforms according to any of claims 1 to 4, characterized in that said driving assembly comprises anchorages arranged on said base and anchor chains connecting said anchorages with said trestle body, said anchorages being arranged in two groups, said anchor chains being in one-to-one correspondence with said anchorages.

9. The landing stage structure of claim 8, wherein a mounting shackle is further arranged on the top of the end of the landing stage body away from the base, and the anchor chain is connected with the mounting shackle.