KR840001200Y1 - Vertically movable marine working platform structure having verically movable groundable support frames - Google Patents

Abstract

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Description

Platform structure for landing lift type marine operation

1 is a platform structure for landing lifting marine operation according to the present invention.

2 is a plan view of the platform structure for offshore operations shown in FIG.

3 is an enlarged plan view illustrating the engagement relationship between the support frame and the working platform.

4 is an enlarged side view showing the engagement relationship between the gap point of the support frame and the guide member supporting the support frame;

5 is a partial cross-sectional view of the lifting means for vertically moving the working platform.

6 is a partial side cross-sectional view of another embodiment of the present invention.

7 is a cross-sectional view taken along line 6 of FIG.

8 is a partial side cross-sectional view showing yet another embodiment of the present invention.

9 is a view illustrating a relationship between the force of the support frame and the guide member in the lifting platform lifting structure of the present invention.

The present invention relates to a landing construction platform structure, and more particularly, even though the weight of the support frame is reduced, such as the force of wind or waves during towing or landing the working platform structure, or during installation work The present invention relates to a platform structure for landing lift type marine operations capable of withstanding external horizontal forces.

While such landing lifting platform structures are towed, the working platform itself floats on the surface of the sea with the support frame upright, and when working, the structure of the platform is grounded to the ground The support frame is operated to fall into the seawater in such a way as to maintain a.

The material and size of the working platform structure, including the supporting frame described above, is such that the working platform structure, as described above, during the towing or landing, and also during the installation or work, can withstand the intended natural conditions. Is determined.

In particular, when such working platform structures are used for underwater oilfield exploration, these structures need to be manufactured with specially selected materials and specifications. Therefore, most of the working platform structures of this kind are usually composed of high tensile steel.

For this reason, much effort is required to reduce the weight of the support frame mentioned above.

Each such support frame is composed of a plurality of cords arranged in parallel and perpendicular to each other, each end of a plurality of horizontal members are connected to the panel point portion of the cord, and both ends of each of the diagonal members It is connected to the critical point of, so that the best safety can be obtained when the guide member installed on the working platform is located at a point substantially corresponding to the position of the critical point of the cord.

That is, the horizontal force transmitted from the guide member to the support frame is mainly concentrated at the gap point, and is actually evenly distributed by the support frame and the respective cords through the horizontal member and the diagonal member, so that the adjacent members in the longitudinal direction of the cord are adjacent. Concentration of the load in that portion of the code lying between the two gap points can be effectively avoided.

On the other hand, when the guide member is located at the center point of the cord placed between two longitudinally adjacent gap points, the load is most dangerous. Therefore, when the working platform structure is landed and subjected to a storm during installation, the working platform is vertically moved to a safe place where the guide member is aligned in line with the gap point of the support frame of the same level.

In addition, the position of the foot can (Foot Can) attached to the bottom of the support frame

(A) the slope of the seabed surface,

(B) lack of uniformity of geological formation in such areas of the seabed just below and around the chief member,

(C) Due to the unbalanced loading on the chief members, they do not actually coincide with each other about the vertical axis of the working platform structure.

On the other hand, the working platform needs to be practically level.

As a result, when using a guide member that is shorter than the distance between two vertically adjacent points of the cord, it is practically difficult to adjust the position of the working platform so that the position of the guide member is aligned in line with the points.

Another object of the present invention is to provide a landing lifting platform structure that allows the guide member to be installed on the working platform so that it is aligned in line with the critical point at the same level as the support frame under any circumstances.

An object of the present invention is to reduce the manufacturing cost of the structure by reducing the weight of the support frame of the platform structure for offshore operations.

In order to achieve the above object, the present invention is equipped with a working platform, a plurality of support frames installed relatively liftable with respect to the work platform, a jack house installed on the top of the full working platform, and each support frame A platform structure for landing lifting type marine equipment having a chief member at a lower portion thereof, wherein the cord of the supporting frame is extended to the side of the chief member, and the chief member and the horizontal member of the support frame directly thereon. The chief member serves as the horizontal member by making the interval equal to that of two adjacent horizontal members, and installs an upper guide member for guiding the cord of the support frame in the inside of the jack house, and at the lower part of the working platform In addition to installing grooves for accommodating patriarchal members, the working platform The structure of the landing elevation type marine platform, wherein the lower guide member is installed over the recessed electric wire from the inside of the latfoam, and the length of each upper and lower guide member is made to be equal to or greater than a distance between two adjacent horizontal members. Is to provide.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

In the vertically movable marine work platform structure (A), which is called a float type marine work platform structure, a working platform (deck) 1 and a support frame 2 for supporting the work platform 1 are installed. When the support frame 2 is grounded to the seabed, a dish-like sheath member 3 composed of a large area sufficient to support the working platform 1, the support frame 2 and other sub-heads is attached to the bottom of the support frame 2 When the above-mentioned working platform (1) floats from the sea surface, the support frame (2) is moved vertically, and the support frame (2) is grounded to the sea bottom and the working platform structure is installed. Lifting device (4) is installed to move up and down, and the upper guide member (5) to be described later to smoothly move the working platform (1) or support frame (2) in the vertical direction It is installed in the upper part of the jack house (7) so that it can be used, the lower guide member (6) is installed in the working platform (1), and the electrical jack house (7) is reliably on the upper part of the working platform (1). It is fixed, and the upper guide member (5) is accommodated in the upper portion and engaged with the support frame (2), the working platform (1) is mounted to transmit the weight of the other member to the lifting device (4).

The lower surface of the working platform 1 is provided with a groove large enough to hold the dish-like chief member 3.

Each support frame 2 has a plurality of cords 21 (four in the embodiment of Figs. 1 and 2) arranged vertically in parallel with each other, and a horizontal member between two neighboring cords 21. (22) is adjusted, the diagonal member 23 is fixed between the two horizontally adjacent horizontal member 22 and the two adjacent cord 21, the horizontal member 22 and the diagonal member 23 The gap point part 24 connected to the cord 21 is formed, and a reinforcing material (not shown) is installed to securely fix the horizontal member 22, the diagonal member 23, and the cord 21 together, and the lifting and lowering is performed. The rack 25 engageable with the device 4 is reliably fixed perpendicularly to the cord 21.

The gap points 24 are positioned on the support frames 2 at regular intervals in the vertical direction.

The lowest point 24 is arranged in a position as close to the dish type chief member 3 as possible.

If the lowest point 24 is placed adjacent to the dish-like chief member 3, the point of contact is provided when the support frame 2 is fully lifted up and fitted into the recess 8 provided on the lower surface of the working platform 1. 24 are gripped by the lower guide member 6 installed in the working platform 1.

As a result, the stresses generated in the support frame are dispersed.

As shown in FIGS. 1 and 4, the length of each of the upper guide member 5 and the lower guide member 6 is equal to the distance between two vertically adjacent gap points 24.

It is therefore essential for each guide member to include at least one gap point 24 in its length irrespective of the relative positional relationship between the upper guide member 5, the lower guide member 6 and the support frame 2. to be.

Therefore, the horizontal force transmitted from the guide member to the support frame is mainly concentrated at the point of the point, and can be transmitted to the substantially flat part by the horizontal member and the diagonal member, so that the load on the cord portion lying between the two vertically adjacent point of the point is This can effectively prevent the concentration of.

The length of both guide members 5 and 6 is preferably equal to or greater than the distance between two vertically adjacent gap points 24 or the distance between the horizontal members 22. For example, the stress generated in the unit length of the support frame when stopped at a position including a single point portion in the length of the guide member having a length according to the present invention, and the distance between two vertically adjacent When a conventional guide member having a length shorter than the horizontal member stops in the middle between two vertically adjacent gap points, the stresses generated in the unit length of the same support frame are estimated by the test.

The result is that the former is several orders of magnitude smaller than the latter.

As an example, as shown in FIG. 9, the upper and lower guide members having a length h with respect to the support frame 2 having a height h are disposed between two horizontal members 22 and 22. (5) (6) Explain the principle with respect to the platform-like platform for landing lift type marine work with the distance between the centers separated by 2h. Is displayed.

At this time, the force of the arrow F is applied between the upper guide member 5 and the support frame 2.

If the distance between the above-mentioned support frame 2 and the upper guide member 5 is g, in this state, the support frame 2 inclines with respect to the upper guide member 5 as following (1) Formula.

Regarding the upper guide member 5 and the deformation of the support frame 2 and the force F acting between the support frame 2 and the upper guide member 5 described above, when the force F is small, The force F is first supported at the top ⓒ of the upper guide member 5, at which force the cord 21 is bent and a deformation of δ occurs between the gap points.

This deformation amount δ can be expressed by the following equation (2) when the cord 21 is considered to be simply supported between the gap points.

However, (E) is the young's rate and (Ic) is the bending stiffness of the cord 21.

When the force F becomes large, the deformation amount δ becomes large, and at a certain force F, the gap point In the guide member 5 and the support frame 2 is in contact. At this time, the deformation amount δ has a relationship between the inclination of the entire support frame 2 and the following equation (3).

Therefore, the force Fc supported at the top ⓒ of the upper guide member 5 is obtained from the equations (1), (2) and (3).

Is indicated as.

That is, when the force F applied to the upper guide member 5 exceeds the force Fc, the support frame 2 and the upper guide member 5 are divided by the gap point. Is contacted at. Since the rigidity of the shaft 21 of the cord 21 and the diagonal member 23 can be designed to be larger than the bending stiffness of the cord 21, most of the forces of (F)-(Fc) are gap points. From the through the diagonal member 23 is transmitted to the cord 21 and the other diagonal member (23).

Actually a point Since it is somewhat displaced by the force of the drawing, the force applied at the point ⓒ of the upper end of the upper guide member 5 is also increased again, but the force F acting between the upper guide member 5 and the support frame 2 closely. F-Fc (≡F) is the hot spot except the force (Fc) acting on the center of the cord 21 obtained by the above formula (4). You may think that it is added to. According to the actually designed example, the horizontal force F in charge of one cord 21 is about 500 tons.

The distance h of the horizontal member 22 described above is 6 m, and the bending stiffness Ic of the cord 21 is 3 × 10 ⁵ cm 3, and the distance between the support frame 2 and the upper guide member 5 g. ) 3 cm, Fc = 105 tons. That is, in this example, about 1/5 of the horizontal force is applied to the cord 21, and about 4/5 is applied to the gap point. So far, as an example to explain the principle, the gap of the support frame 2 has been described in the middle of the upper guide member 5, but the positional relationship between the support frame 2 and the upper guide member 5 is changed. The same can be said.

On the other hand, when the length of the upper guide member 5 is short when it comes between two horizontal members 22 and 22, it is necessary to support the total of the horizontal forces in the bent rigidity of the cord 21. In this case, the flexural strength of about five times the previous example must be given to the cord.

As described above, in the present invention, since the horizontal force applied to the cord 21 of the support frame 2 is about 1/5 of the total horizontal force, the safety of the support frame is improved. Therefore, it is very useful industrially.

In addition, the upper and lower guide members 5 and 6 are arcuately shaped as shown in FIG. 3, and the working platform 1 is provided while the upper and lower guide members 5 and 6 move vertically. It is better to design the support of the cord 21 as large as possible without contacting the support frame 2, and the distance between the guide member 5, 6 and the cord 21 is set as small as possible. Good to do.

6 and 7 show another embodiment of the present invention, in which the code 21 constituting the support frame is fixed to the side of the polygonal chief member 3, which is the lowest horizontal It serves as a member. The distance between the point portion 2a where the polygonal chieftain member 3 is fixed to the cord 21 and the point portion immediately above the point portion 2a is set equal to the distance between two vertically adjacent point portions. .

The working platform 1 is provided with grooves 8a at its lower surface to hold the polygonal chief member 3 therein as shown in FIG. 8, and each lower guide member 6 is a polygon chief member. The gap point 2a to which 3 is fixed extends to the side wall of the recess 8a to be supported by the lower guide member 6.

In the above arrangement, the lower guide member 6, which is longer than the lower guide member used in the conventional offshore working platform structure, can be grasped well in the working platform.

That is, since the polygonal chieftain member 3 is held in the recess 8a, there is no part projecting downward from the lower surface of the working platform 1 as in the conventional art indicated by the dotted line in FIG. It can be easily towed using a barge.

In more detail, the distance between the upper guide member 5 and the lower guide member 6 is not measured in the present invention, but the distance between the upper guide member 5 and the lower guide member 6 The larger the change amount 8 of the cord 21 of the support frame 2 and the force Fc at the point ⓒ of the upper end of the guide member become smaller.

Therefore, as shown in FIG. 6 and FIG. 8, when extending the cord 21 of the support frame 2 to the lower end of the patriarchal member 3, and floating and moving the platform 1 for offshore operations, By storing the recessed part 3 of the recess 8a of the working platform 1, it can be towed and sailed even in the shallow sea where the lower part of the ship is submerged, and the chieftain member 3 of the groove 8a Since it is stored in the center, it is possible to easily mount the structure (A) of the flat loading ship platform even if there is no special equipment when carrying the working platform structure (A) on the loading ship (Ba rdge).

On the other hand, when the height or length of the working platform 1 is, for example, twice or more than two times the distance between two vertically adjacent gap points 24, the upper portion of the working platform 1 is shown in FIG. It is preferable to install the groove 9 so that the jack house 7 and the elevating device 4 are arranged in the groove 9.

In this example, the height of the jackhouse 7 can be made smaller between the lower surface of the working platform 1 and the upper surface of the jackhouse 7 compared to the neck mounted on the upper surface of the working platform. The weight of the working platform 1 itself can also be somewhat reduced.

According to the present invention, the upper and lower guides are formed at least larger than the distance between two vertically adjacent gap points so that the horizontal force acts mainly on the gap points and can be distributed to the respective cords through the horizontal member and the diagonal member. Will be.

As a result, in the case of the present invention, the stress of the code per unit length between the two adjacent longitudinal points is insufficient for only one short guide, i.e. the size between the adjacent two adjacent points in the length direction. It is limited to tens of times smaller than in the guide of length. Therefore, the weight of the support frame can be reduced to a size corresponding to the reduction in stress generated therein, for example by reducing the thickness of the cord.

This is to reduce the rework cost of the working platform.

Claims (1)

It is equipped with the work platform 1, the several support frame 2 installed so that it can be elevated relative to this work platform, and the jack house 7 provided in the upper part of the above-mentioned work platform, and each support frame In a platform for lifting and lifting marine operations having a chief member (3) at a lower portion thereof, the cord (21) of the supporting frame (2) is extended to the side of the chief member (3), and the chief member and The jackhouse 7 is constructed so that the chief member also serves as the horizontal member by making the distance between the horizontal member 22 of the support frame immediately above the same as that of two adjacent horizontal members 22 and 22. The upper guide member (5) for guiding the cord of the support frame is installed in the inside of the), and the groove (8) (8a) for accommodating the chief member in the lower part of the working platform (formed above), and the working platform From inside of The lower guide member 6 is provided over one groove, and the length of the upper and lower guide members 5 and 6 is made to be equal to or greater than the distance between two adjacent horizontal members 22 and 22. Platform structure for lifting and lifting marine operations.