FI68878C - VAEGGKONSTRUKTION AV STAOLBETONG FOER ANVAENDNING SPECIELLT I FF-SHORE-KONSTRUKTIONER I ARKTISKA FOERHAOLLANDEN - Google Patents

Description

63878

Teräsbetoninen wall structure, especially for off-shore structures used in arctic conditions Väggkonstruktion av stälbetong för användning speciellt i off-shore-constructioner i arcticka förhällanden

The invention relates to a reinforced concrete wall structure, in particular for off-shore structures or the like, in which the outer surface of the structure is exposed to ice, water and / or earth consumption and / or pressure, and which wall structure is made of a casting component such as concrete or a reinforcing component. consists mainly of a uniform plate structure and a series of profiles attached to it.

Off-shore construction and the like are required to have lightness and a high strength of 10 ice pressures, as well as resistance to mechanical wear of ice or water, which is applied to the outer surface of the structure. Said structures and the like, such as lighthouses, breakwaters, ice and land islands, harbor piers and dam structures, have previously been made as reinforced concrete walls. However, the outer surface of concrete walls is not always sufficiently resistant to e.g. mechanical wear of ice.

When reinforced concrete walls are made for the above-mentioned applications using previously known technology, difficulties arise in the construction of reinforcement and in the repairability of structures. In addition, the wall structures become relatively heavy when using previously known reinforcements.

20

A disadvantage of the previously known such wall structures has also been that they have not been sufficiently resistant to loads in which the load is applied to a narrow area. These loads have caused the so-called punch-shear. 25 For example, in arctic off-shore structures, the ice pressure locally may be as high as 10 MPa.

The object of the present invention is to avoid the above-mentioned drawbacks and to provide a composite reinforced concrete wall structure 2 68878 which is advantageous in terms of manufacturability and which provides light but sufficiently strong wall structures whose outer surface is also mechanically strong, e.g. against mechanical wear of ice.

5

It is also a further object of the invention to provide such a wall structure with which suitable e.g. e.g. cylindrical, conical, curved - also variable and intricately curved - wall structures can be provided.

10

In order to achieve the above and later objects, the invention is mainly characterized in that a series of outer flanges of said profiles form a substantially integral steel casing which together with said steel plate wall 15 forms a casing shell structure as a casting structure

Of the advantages provided by the invention, the importance of manufacturing technology must be emphasized; automatic machines can be used to weld a double-layer steel shell, which has not been possible in previously known solutions if the shell thickness is so small that the welder does not fit between the walls of the shell structure. At the same time, the double shell acts as both a reinforcement for concreting and a casting mold. Another difference from the previously known connection structures is that the shell in question can now receive loads from different directions (i.e. positive and negative bending moments), which is an essential load situation in e.g. arctic off-shore structures.

The wall structure according to the invention is also advantageous in terms of manufacturability, since its reinforcement component consists of standard profiles which can be easily manufactured, transported and installed in place. An important advantage of the wall structure according to the invention is its easier repairability compared to the previously known steel-35 concrete structures, which is achieved by means of the composite structure according to the invention and its special reinforcement component.

68878 3

According to the invention, there is provided a wall structure having uniform steel sheath surfaces, at least one of which is a wear-resistant outer surface. In addition, the steel profiles and the jacket plate form a shell structure which also preferably acts as a mold. Thus, no other mold or reinforcement is required, but the steel component forms both the mold and the reinforcement. The reinforcement component consisting of steel profiles or the like of the wall structure gives the wall structure sufficient strength in terms of pressure loads and the like.

The invention will now be described in detail with reference to some embodiments of the invention shown in the figures of the accompanying drawing, to the details of which the invention is in no way narrowly limited.

Figure 1 shows an example of an application for a wall structure according to the invention, namely a mobile production or drilling rig used in arctic conditions.

Fig. 2 shows a cross-section of an embodiment according to the invention 20 of a cylindrical or conical structure used, for example, in connection with production or drilling platforms such as Fig. 1.

Figure 3 illustrates examples of a wall structure according to the invention which is curved in several directions.

Figure 4 shows a cross-section of a steel profile used in connection with a wall structure according to the invention, which has a gripping arrangement which enhances the joint structure.

30

Figure 5 illustrates an example of a wall structure according to the invention.

Figure 6 shows an alternative wall structure according to the invention in cross-section.

4,68788

Fig. 7A is an axonometric view of an example of a steel profile with a gripping projection.

Figures 7B and 7C show alternative cross-sections of the profile of Figure 8A 5.

Figure 8A is an axonometric view of an alternative steel profile with a gripping projection.

Fig. 8B shows a longitudinal section of the profile of Fig. 8A at the gripping projection.

Fig. 9A shows a cross-section of a steel profile with a gripping rod welded to one of its flanges.

15

Fig. 9B shows a longitudinal section of the profile of Fig. 9A.

Figure 10 shows an alternative profile with a gripping projection according to the invention.

Figure 1 shows an example of the application of the wall structure according to the invention, namely a mobile production or drilling platform (AMDS = Arctic Mobile 25 Drilling Structure) for use in arctic conditions. The drilling or production platform shown in Figure 1 rests on its base standing on the bottom. According to Figure 1, said base is made of a reinforced concrete wall structure according to the invention, several embodiments of which will be described in more detail later. Said stand comprises a first conical part 10 resting on the seabed on the hull. The water depth is usually about 15-30 m.

Associated with the first conical portion 10 is a second steeper conical portion 11 located at ice level I. The purpose of the conical part 11 is to receive the pressure caused by the ice 11 and to break the ice. Ig refers to broken ice. Otherwise, the drilling or production platform 33 is known per se, comprising a deck 13 with accommodation and other arrangements known per se, such as a tower 14, a helipad 15, cranes and some mold equipment not shown.

5 68878

Fig. 2 illustrates in cross-section an example of a reinforced concrete composite wall according to the invention, which is used, for example, in the production and drilling platforms according to Fig. 1 or the like. According to Figure 2, the wall structure comprises steel profiles 5 20 which are L-shaped in cross section. The profiles 20 include an outer flange 21 and an inner flange 22. A series of outer flanges 21 form a wall structure jacket surface 24. The outer surface 25 of the wall structure is formed by a unitary jacket plate 50 having a profile . The casting step can be performed as described later. The jacket plate 50 preferably forms a wear-resistant steel outer surface of the structure, e.g. ice. In some cases, the surface formed by the outer flanges 21 of the profiles 20 can also be used as the outer surface of the structure. The inner flanges 22 of the profiles 20 extend in the wall thickness direction H through the entire wall structure. The inner flanges 22 have a series of holes which provide adhesion between the concrete 30 and its reinforcing profiles 20. Thus, a steel-concrete composite structure is formed with a concrete component 30 as a casting component and a series of profiles 20 as a reinforcement component, as well as, to some extent, a unitary sheath plate 50.

An essential feature of the invention is that the profiles 20, namely their outer flanges 21, form a jacket surface 25 24 in the reinforced concrete structure, the second jacket surface being formed of a uniform steel plate 50 to which the profiles 20 are attached, e.g. by welds 51.

The inner flanges of the profiles 20, which are located mainly in the thickness direction H of the wall structure, largely give the wall structure its strength against, for example, ice or water pressure.

Figure 3 illustrates how differently curved walls are obtained from the wall structure 35 according to the invention using L-shaped profiles 20. According to Figure 3, the surface 24 'of the wall structure is S-shaped, 68878 Ό sestl curved as well as its surface 25 *. The flanges 21 of the profiles 20 form a steel jacket surface 24 in the wall structure, while the outer surface 25 of the structure is formed by a unitary steel plate 50.

Figure 4 shows an example of an adhesive projection of an L-shaped profile. The inner flange 22 is made, for example, by punching a series of openings from the edge of which a tongue 27 protrudes. The tongues 27 and the concrete penetrating through the series of openings 26 provide a reliable adhesion between the casting component, i.e. concrete, and the reinforcement component.

Figure 5 illustrates an example of an embodiment according to the invention in which the flanges 21, 22 of the profiles 20 are perpendicular to each other. The flanges 22 are without a gripping projection, so that the implementation according to Fig. 5 is best suited for use in applications where a particularly high strength of the wall structure is not required. The flanges 21 come in immediate succession in the profiles 20, so that an intact steel casing surface 24 of the wall structures is formed. The flanges 21 of the profiles 20 can be welded together, which is not always necessary. The profiles 20 are welded to the sheath plate 50 by welding 51 so as to form a closed housing and shell structure.

According to Figure 6, the flanges 21 'and 22' of the profiles 20 are at an angle of slightly more than 90 ° to each other. The outer flanges 25 21 'of the profiles 20 overlap slightly so as to form a continuous steel sheath surface 24. As shown in Figure 6, the flanges 22' are not provided with a gripping projection, but can be provided if necessary. The profiles 20 are welded to the sheath plate 50 by welding 51 to form a shell structure.

30

Figures 7-10 illustrate some examples of adhesive projections according to the invention which provide the connection required between the application and the strength of the structure 35 between the reinforcing component of the composite wall, i.e. the profile 20 and the casting component, i.e. the concrete 30 or the like.

7 68878

According to Fig. 7A, the inner flange 22 of the profile 20 has a series of perforations 28 which may comprise a collar 29 as shown in Fig. 7B to improve adhesion, or as shown in Fig. 7C, the perforation 28 may be without protrusions.

5

According to Figures 8A and 8B, a series of openings 31 are cut in the inner flange 22 of the profile 20, at which the material is bent into a tongue 32 which adheres to the casting component, i.e. the concrete 30.

As shown in Figures 9A and 9B, a gripping rod 33 parallel to the length of the profile 20 is attached to the inner flange of the profile 20 by means of 34. The rod 33 will be surrounded by the casting component 30 and a reliable connection between the casting component 30 and the inner flange 22 of the profiles 20 is provided via the fastening pieces 34. The bars 33 also act as reinforcements for the reinforced concrete structure.

According to Figure 10, elongate perforations 35 are made in the inner flange 22 of the profile 20, from which tongues 36 are bent, which provide adhesion between the concrete 30 and the profiles 20.

20

An essential feature of the invention is that the unitary sheath plate 50 and the series of profiles 20 welded to one surface thereof form a housing-like shell structure which acts both as a reinforcement of the wall structure and as a mold. The casting of the concrete component or a similar casting component 25 takes place after the steel component (shell structure) has been substantially completely finished. Concrete casting can be done on the same construction site as the making of steel parts. Another possibility is to transport the parts of the steel component to the concrete station for the casting stage, e.g. as a float transport. The concrete is cast into the enclosed enclosures 30 formed by the jacket plate 50 and the profile set 20, e.g. by utilizing the normal hose filling method, without the need for a separate mold or reinforcement. The actual final structures can be assembled on site from prefabricated reinforced concrete elements made in accordance with the invention using welded joints.

35

The composite reinforced concrete wall structure described above can be used in a variety of applications where a strong and 8 68878 lightweight structure is required, as well as resistance to mechanical stresses on the outer surface of the wall structure or both surfaces such as water or ice. The invention can be applied, for example, in the drilling and production platforms for arctic conditions shown in Figure 1. Deviating from Figure 1, said platforms may also have one or more cylindrical column-shaped legs on which the drilling or production platform stands. Such cylindrical legs must generally be provided with a conical icebreaking part which can be made of the wall structure according to the invention, as well as the above-mentioned cylindrical legs.

The invention can also be applied in artificial islands and floating drilling and production platforms.

One application of the invention is various berth structures, such as harbor berths, floating berths and fixed berths. Possible applications of the invention also include lighthouses, wave power plants or the like.

The invention can also be applied to various dam structures, such as water and earth dams. Other applications not mentioned above may also be considered. In general, the invention can be found to be suitable for applications in which the outer surface of the wall structure or both surfaces are subjected to the abrasive action of ice, water, earth or the like and / or pressure.

Although concrete is mentioned above as the casting component according to the invention, which is more generally considered, other casting components, e.g. polyurethane or the like, can also be used in the invention in certain special applications.

The reinforcement or steel component has been discussed above, but it is to be understood that in the context of the invention, other types of reinforcement structures consisting of profiles 20 or the like, which are made of a material other than steel, may also be considered in certain special applications.

9 68878

The following are claims within the scope of which the various details of the invention may vary within the scope of the inventive idea.

Claims (15)

68878 Claims 1. Reinforced concrete wall structure, in particular for offshore structures or the like, where the outer surface of the structure is exposed to ice, water and / or earth consumption and / or pressure, and which wall structure is made of a casting component such as concrete (30) or similar and reinforcement , consisting essentially of a unitary plate structure (50) and a series of profiles (20) attached thereto, characterized in that the series of outer flaps (21) of said profiles (20) form a substantially integral steel sheath (24) which together with said steel plate wall (50) together forms a housing-like shell structure which acts as both a reinforcing component of the wall structure and a mold 12 of the casting step of the casting component. Wall structure according to claim 1, characterized in that said profiles (20) are attached to the integral plate wall (50) by welding joints from the outer edges of their inner flanges (22). Wall structure according to claim 1 or 2, characterized in that said integral plate wall (50) acts as an abrasion and / or pressure resistant outer jacket (25) of the wall structure 20. Wall structure according to claim 1 or 2, characterized in that the series of outer flaps (21) of said profiles (20) form a substantially uniform outer or inner jacket (24) resistant to wear and / or pressure on the reinforced concrete structure. Wall structure according to one of Claims 1 to 4, characterized in that the flanges (22) of the profiles (20), which have a considerable dimension (H) in the thickness direction of the wall structure, essentially give the wall structure its tensile strength. Wall structure according to claims 1-5, characterized in that said set of profiles consists of elongate profiles (20) of substantially L-shaped cross-section, several of which are 68 68878 parallel to the plane of the wall structure, the outer flange (21) of the profiles (20) being abrasion resistant j steel or equivalent casing (24). j Wall structure according to claim 6, characterized in that the inner latch (22) of said L-shaped profiles (20) extends through the entire wall structure in its thickness direction (H). Wall structure according to Claim 6 or 7, characterized in that the outer flanges (21) of the L-shaped profiles (20) are substantially perpendicular to their inner flanges (22) and that the inner flanges (21) come substantially immediately in succession to form a steel or similar shell of the wall structure. (24) (Figure 5). Wall structure according to Claim 6 or 7, characterized in that the outer flanges (21 ') of the profiles (20) overlap partially overlapping (Fig. 6). Wall structure according to any one of claims 1 to 9, characterized in that said profiles (20) have perforations (23; 26; 28; 31; 35) and / or projections (29; 32; 33,34; 36) to increase the coupling and adhesion between the reinforcing component and the casting component (30) so as to provide a composite structure having the required strength in each application. 25 Wall structure according to Claim 10, characterized in that the inner latch (20) of the profiles (20) has a perforation at which the adhesive projection (29; 32; 36) is formed from the material. 30 Wall structure according to Claim 10, characterized in that rod-like parts (33) are fastened to the inner flange (22) and / or the outer flange (21) of the profiles (10), which form an adhesion projection between the reinforcement component and the casting component and possibly also serve as reinforcement for the wall structure. 12 68878 A method of manufacturing a wall structure according to any one of claims 10, 11 or 12, characterized in that profiles are produced from said plate wall (50) and a series of profiles (20), preferably by welding (51) to another surface of the plate wall (50). shell structure and that a casting component such as concrete is then cast into the honeycomb spaces of said shell structure with the shell structure acting as a mold. IA. A method according to claim 13, characterized in that the concrete pouring step is performed by a hose filling method known per se, said shell structure acting as a casting mold. Use of a wall structure according to any one of claims 1 to 12 and / or a method according to claim IA in off-ehore structures, such as drilling and production platforms, cologne islands, wave power plants and / or quay structures, dam structures and / or the like. 13 68878