EP3456660A1 - Container made from a tilted curved metal sheet - Google Patents

Abstract

A cylindrical container (10), in particular a silo for storing solids, liquids and / or gases, bulk materials or the like, produced from a single-layer, helically bent sheet-metal strip (20, 20.1, 20.2), whose superimposed adjacently disposed edge portions (26.1, 26.2) at a helically extending continuous joint (50) are sealingly connected to each other, wherein the upper edge portion (26.2) of a lower sheet metal strip (20.2) to the container outer side (A) about a second bending edge ( 24.2) is angled, characterized in that the lower edge portion (26.1) of the upper sheet metal strip (20.1) above the joint (50) has a to the container outer side (A) extending first cross-sectional embossment (32), such that directly below the joint ( 50) by the subsequent upper side of the upper edge portion (26.2) of the lower lead Chbandes (20.2) an inwardly projecting protrusion surface (52) is formed, which counteracts the gravity-related outflow of the still-liquid weld metal when producing an inner weld (40) on the container inner side (I) at the level of the joint (50), or prevents this.

Description

TECHNICAL AREA

The present invention relates to a container, in particular a silo for storing solids, liquids and / or gases, bulk materials or the like, made of a single-layer, helically bent, one above the other continuously extending arranged, forming a cylindrical plane sheet metal strip, its superimposed adjacent edge portions a helically extending continuous joint are sealingly connected to each other, wherein the upper edge portion of a lower sheet metal strip is angled to the container outside to a second bending edge.

STATE OF THE ART

From spirally bent metal strip produced containers are from the DE 2 250 239 A known. To produce containers, a coil with a diameter corresponding to the container diameter is formed from a sheet metal strip. In the production of such a container, the mutually associated Wendelblechbandränder be first bent and then connected to the outside of the container by means of a fold fluid-tight with each other. For this purpose, the opposing longitudinal edges of the sheet metal strip are each U-shaped bent and the associated U-shaped bent sheet edges are placed inside each other and then connected by folding. This system is known on the market as a lip double seam system and proven in many ways. This lip double-seam system enables easy and fast production of containers of variable diameter and height. Transportable bending sheet and mounting devices ensure that the container can be mounted at the respective site and the transport volume can be reduced accordingly.

From the DE 199 39 180 A1 It is known to produce a container such that a first edge portion is bent to form a helical extending Ausbiegekante to the outside and a second edge portion of the sheet metal strip adjacent thereto is bent outwards and then connected by a fold with a first edge portion.

For the previous applications of this container system, for example, for storage of bulk materials from agriculture and forestry or biowaste, the containers have excellent stability, tightness and media resistance. For other applications such as the storage of fluid media such as vegetable oils, petroleum or the like, however, a significantly larger container volume is required, in which the tightness must be reliably guaranteed. The associated increased mechanical stability of the container can not be sufficiently ensured by the known folding systems. In particular, the folding system reaches its limits with large sheet thicknesses.

In order to provide containers made of bent sheet metal strip helically, the range of applications is increased, in particular with respect to the implementation of a large storage volume and / or increased mechanical stability while ensuring a still simple and quick to manufacture or assembly, solutions have been developed, the folded seam by a Replace welded joint.

The WO 2014/048515 A1 discloses a container made of a helically bent sheet-metal strip of the type described above, wherein the edge portions of the height one above the other adjacent edge regions of the sheet metal strip are connected to each other via a welded joint. In this case, the edge regions overlap and are fluid-tightly interconnected by two separate welds. Due to the existing spacing of the weld seams, a gap region arises between the overlapping walls in the overlap region of adjacent edge regions of the sheet-metal strip, which can not be controlled in a simple manner after production of the container with regard to possible corrosion risks or the like.

The EP 1181115 B1 describes a cylindrical container of the type mentioned and a method for producing such a container. In this cylindrical container, a jacket is used, which consists at least partially of a metal strip which is wound helically, so that the lateral edge regions of the sheet metal strip adjoin one another at a helically extending joint. The edge regions of the sheet metal strip are angled at the joint point in each case to one side, wherein the angled region is sealingly connected to each other by a rabbet joint. At the same time, the sheet metal strip is welded together in the vicinity of the joint on the shell inside. In this case, the edge regions of the upper and lower sheet-metal strip which meet at the abutment point are arranged in one plane, so that only by the curvature of the edge region in the abutting region is there a gap for the attachment of a weld seam. This has the consequence that the weld can be attached sealingly and reliably only with increased effort, since the weld metal in the region of the joint during the production process in the liquid state due to the action of gravity tends to flow downwards, which adversely affects the quality of the weld , Frequently, therefore, expensive measures must be taken in this area to produce a weld that ensures a permanently reliable connection function with high load capacity and a permanently reliable sealing function. This is happening especially in containers with thin sheet metal strip sections as consuming.

The DE 20 2012 009 932 U1 discloses a container made of a helically bent sheet-metal strip, wherein the mutually adjacent helical Blechbandränder are bent and sealed by a fold, which is characterized in that on the opposite side of the rebate of the region of the Falzfußes an additional sheet metal section is welded to a To prevent ingress of foreign substances in the fold, but which is relatively expensive in terms of production.

In the DE 10 2015 004 281 A1 is a container made of a single-layer, helically bent metal strip disclosed in which no rabbet joint is used, but the compound in the joint area of adjacent helical edge portions of the sheet metal strip is made by welded on both sides of the inside and the outside welded joint, which is particularly high Requires the production of the welded joint and requires a high positioning accuracy of the supplied edge regions for producing the welded joint.

PRESENTATION OF THE INVENTION

Based on the cited prior art, the present invention, the object or the technical problem of specifying a cylindrical container that further increases the range of applications such containers and in particular while maintaining the economic manufacturability on site by helical metal strips ensures that made on site welded joints can be implemented in a simple manner, guarantee permanently reliable strength, enable high positioning accuracy, and meet the highest standards of purity, media resistance and leak tightness Meet container, ensure a durable reliable function, high load security allow, especially in exceptional conditions such as earthquakes or the like to allow the implementation of containers in terms of diameter and height and thin wall thicknesses, which were previously impossible to ensure a high load capacity.

The inventive cylindrical container of the type mentioned is given by the features of independent claim 1.

Advantageous embodiments and further developments are the subject of claims dependent directly or indirectly from the independent claim 1.

The cylindrical container according to the invention of the type mentioned above is accordingly characterized in that the lower edge portion of the upper sheet metal strip above the joint has a first cross-sectional embossing extending to the container outer side or the upper edge portion of the lower sheet metal strip below the joint has a cross-sectional embossing running towards the container inner side in that an inwardly projecting protrusion surface is formed directly below the joint through the adjoining upper side of the upper edge section of the lower sheet metal strip, which counteracts the gravitational outflow of the still liquid weld metal at the level of the joint when producing an inner weld seam on the inner side of the container.

A constructionally particularly simple to implement embodiment, which ensures a simple structural implementation, is characterized in that the cross-sectional embossing has a substantially linear course.

Alternatively, it is also possible to design the cross-section impressions in such a way that the cross-sectional embossing is offset parallel to the cross-section Container wall level runs. Also in this variant, a projecting surface is implemented, which allows a high-quality attachment of the weld.

A particularly preferred embodiment, which ensures a high stability of the container produced, is characterized in that the width of the cross-section embossing is in the range between 30% to 5% of the width of the sheet metal strip.

An advantageous development is characterized in that the lower end region of an upper sheet-metal strip has an offset transverse to the sheet plane relative to the upper end region of the lower sheet-metal strip.

Particularly high loads in conjunction with a reliable tightness are characterized according to a particularly advantageous development in that adjacent metal strips are connected to each other at the joint via an inner weld and an outer weld.

The embodiment shown above offers enormous advantages in practice. Thus, thin stainless steel sheets can be used for the containers, since the sheet is given a "structure" by the cross section embossing at the lower edge region of the sheet metal strip, which increases the overall stability. The cross section embossing acts like a "stiffening rib", whereby a thin sheet metal is additionally stabilized in the lower edge area by this shaping. At the same time welding is easier, because there is a projecting surface for the lower edge of the sheet to be welded. Due to the slight deformation of the cross-sectional embossment, the lower sheet metal area rests on the upper edge section of the lower sheet-metal strip, which has been bent at right angles at the upper edge, so that it can be butt welded from the outside as well as from the inside in a simple manner. During welding, no liquid welding material drips down due to the created protrusion surface. Furthermore, can be avoided be welded at the cold-deformed locations of the second bending edge of the upper edge portion of the lower sheet metal strip, since the weld is offset inwardly or outwardly provided.

At the same time, a simple solution is provided in the event that the diameter of the container (tanks) changes during assembly. It is thus provided a mounting option that can implement a change in diameter in a simple manner by making a more or less strong deformation of the lower edge of the sheet and welded at the appropriate place.

Overall, the production of a drinking water tank with extremely thin stainless steel sheets is possible with the container according to the invention, which has high loads, ensures a permanently reliable tightness and can be mounted in a simple manner.

An advantageous preferred embodiment is characterized in that the cross-sectional embossing is formed as a curved region, in particular with a large bending radius.

A particularly advantageous alternative embodiment, which incorporates the advantages of the folding technology, is characterized in that the lower edge portion of an upper sheet metal strip is angled to the container outside about a first bending edge, the angled edge portions connected at the level of the joint on the container outside by means of a hinge connection are, the angled edge portions are joined together at the level of the joint on the container inside by means of an inner weld, such that the first bending edge is arranged in relation to the second bending edge in an existing transversely to the sheet metal band offset.

By combining the connection of adjacent helically extending edge regions of the sheet metal strip on the one hand through the Falzverbindung on the outside and on the other hand by the inner weld on the inside in said structural design is provided as a result, a cylindrical container that ensures extremely high load-bearing capacity, while maintaining the proven manufacturing process high-quality compounds of the edge regions of the metal strip allows in particular has particular advantages in terms of quality and ease of manufacture of the inner weld. The combination of the rabbet joint with the inner weld seam according to the invention allows the production of high-quality inner welds with high positioning accuracy and dimensional accuracy of the entire construction by the special design of the edge regions in the region of the joints of the adjacent metal strips. In total, this ensures a connection of the edge regions of the metal strips, which withstands high stresses, in particular, for example, in the case of earthquake stresses. At the same time a high density is guaranteed and an economical production is possible.

A particularly preferred development, which relies on the existing technology for reliably producing such a container, without additional measures must be taken, is characterized in that the rabbet joint is formed as a simple rabbet joint, in which an edge portion of the lower sheet metal strip as Kragflansch and an edge portion of the upper sheet metal strip is formed as the Kragflansch comprehensive U-profile or vice versa, with particularly high Dichtigkeits- and load capacity requirements, a complementary alternative embodiment is characterized in that the rabbet joint is formed as a multiple fold connection, in particular double fold connection.

With regard to the structural dimensions for the implementation of containers with high structural strength and permanently reliable function, a particularly advantageous embodiment is characterized in that the Offset dimension is in the range between the simple to ten times the sheet thickness of the sheet metal strip.

In this case, an advantageous embodiment is characterized in that the sheet thickness of the sheet metal strip in the range between 1 mm to 15 mm, in particular between 1.5 mm to 7 mm.

In order to ensure the required load-securing even in applications with increased requirements, for example in earthquake-prone areas, an advantageous embodiment is characterized in that the thickness of the inner / outer weld is in the range between one to three times the sheet thickness of the sheet metal strip.

Further advantages and features of the invention can be found in the claims further specified features and the following embodiments.

BRIEF DESCRIPTION OF THE DRAWING

Fig. 1

Schematische Seitenansicht eines zylindrischen Behälters, hergestellt aus einem wendelförmig gebogenem Blechband, dessen Randbereiche miteinander verbunden sind mit Detail I,

Fig. 2

schematische Draufsicht auf den Herstellvorgang eines zylindrischen Behälters gemäß Fig. 1 mit einer Biegestation, Falzstation und Schweißstation,

Fig. 3

schematischer Querschnitt durch das Detail I gemäß Fig. 1 im Randbereich des Behälters gemäß einer ersten alternativen Ausgestaltung der Verbindung übereinander angeordneter Randbereiche der Blechbänder mit einer Falzverbindung und einer Innenschweißnaht, wobei das untere Blechband eine Querschnittseinprägung aufweist,

Fig. 4

schematischer Querschnitt durch das Detail gemäß Fig. 1 im Randbereich des Behälters gemäß einer zweiten alternativen Ausgestaltung der Verbindung übereinander angeordneter Randbereiche der Blechbänder mit einer Falzverbindung und einer Innenschweißnaht, wobei das obere Blechband eine Querschnittseinprägung aufweist,

Fig. 5a und b

schematischer Querschnitt durch den Bereich der Verbindung der Randbereiche benachbart übereinander angeordneter Blechbänder im Montagezustand,

Fig. 6

schematische Draufsicht auf die Zuführung der Blechbänder während des Montagevorgangs,

Fig. 7

schematischer Querschnitt entlang der Schnittführung A in Figur 6 bei der Zusammenfügung der Blechbänder,

Fig. 8

schematischer Querschnitt durch das Detail I gemäß Fig. 1 im Randbereich des Behälters gemäß einer dritten alternativen Ausgestaltung der Verbindung übereinander angeordneter Randbereiche der Blechbänder mit einer Falzverbindung und einer Innenschweißnaht,

Fig. 9

schematischer Querschnitt durch das Detail I gemäß Fig. 1 im Randbereich des Behälters gemäß einer vierten alternativen Ausgestaltung der Verbindung übereinander angeordneter Randbereiche der Blechbänder mit einer Falzverbindung und einer Innenschweißnaht,

Fig. 10

schematischer Querschnitt durch das Detail I gemäß Fig. 1 im Randbereich des Behälters gemäß einer fünften alternativen Ausgestaltung der Verbindung übereinander angeordneter Randbereiche der Blechbänder ohne Falzverbindung mit einer Innen- und Außenschweißnaht, wobei das obere Blechband eine Querschnittseinprägung aufweist und

Fig. 11

schematischer Querschnitt durch das Detail I gemäß Fig. 1 im Randbereich des Behälters gemäß einer sechsten alternativen Ausgestaltung der Verbindung übereinander angeordneter Randbereiche der Blechbänder ohne Falzverbindung mit einer Innen- und Außenschweißnaht, wobei das untere Blechband eine Querschnittseinprägung aufweist.

The invention will be described and explained in more detail below with reference to the embodiments illustrated in the drawings. Show it:

Fig. 1

Schematic side view of a cylindrical container, made of a helically bent sheet-metal strip whose edge regions are connected to each other with detail I,

Fig. 2

schematic plan view of the manufacturing process of a cylindrical container according to Fig. 1 with a bending station, folding station and welding station,

Fig. 3

schematic cross section through the detail I according to Fig. 1 in the edge region of the container according to a first alternative embodiment of the connection of superimposed edge regions of the sheet-metal strips with a seam connection and an inner weld seam, wherein the lower sheet-metal strip has a cross-sectional embossing,

Fig. 4

schematic cross section through the detail according to Fig. 1 in the edge region of the container according to a second alternative embodiment of the connection of superimposed edge regions of the sheet metal strips with a seam connection and an inner weld seam, wherein the upper sheet metal strip has a cross-sectional embossing,

Fig. 5a and b

schematic cross section through the region of the connection of the edge regions adjacent to one another arranged sheet metal strips in the assembled state,

Fig. 6

schematic plan view of the feeding of the metal strips during the assembly process,

Fig. 7

schematic cross section along the section A in FIG. 6 during the assembly of the metal strips,

Fig. 8

schematic cross section through the detail I according to Fig. 1 in the edge region of the container according to a third alternative embodiment of the connection of superimposed edge regions of the sheet metal strips with a seam connection and an inner weld,

Fig. 9

schematic cross section through the detail I according to Fig. 1 in the edge region of the container according to a fourth alternative embodiment of the connection of superimposed edge regions of the metal strips with a folded connection and an inner weld,

Fig. 10

schematic cross section through the detail I according to Fig. 1 in the edge region of the container according to a fifth alternative embodiment of the compound superimposed edge regions of the metal strips without seam connection with an inner and outer weld, wherein the upper sheet metal strip has a cross section embossing and

Fig. 11

schematic cross section through the detail I according to Fig. 1 in the edge region of the container according to a sixth alternative embodiment of the compound superimposed edge regions of the metal strips without seam connection with an inner and outer weld, wherein the lower sheet metal strip has a cross-sectional embossing.

WAYS FOR CARRYING OUT THE INVENTION

The Fig. 1 shows a view of a container 10 of the invention, as it can be used for storing bulk materials from agriculture and forestry, such as grain, wood chips or biowaste, as well as for storing water, sewage or sewage sludge or for storing gas or petroleum. The container 10 is on its outer side and its inner side substantially cylindrical, in particular circular cylindrical, with a vertically oriented longitudinal axis 12th

The preparation of the container 10 is carried out using a helically bent sheet-metal strip 20 preferably directly at the site of the container 10. The diameter 14 of the container 10 may be between 4 m and 20 m or more. The height 16 of the container 10 may be between 2 m and 20 m or more. The capacity of the container 10 may for example be between 15 m ³ and 8,000 m ³ . The preferably homogeneous thickness ( Fig. 2 ) of the sheet metal strip 20 is between 2 mm and 12 mm, can in in particular present case more than 5 mm, preferably more than 6 mm and less than 12 mm, for example between 8 mm and 10 mm. The width of the sheet metal strip 20 may be between 20 cm and 100 cm, in particular between 30 cm and 80 cm and preferably between 40 cm and 60 cm; in the illustrated embodiment, the width of the sheet metal strip 20 is about 50 cm.

In Fig. 3 is the detail I of Fig. 1 in the connection region of adjacent metal strips 20.1, 20.2 shown. The outside of the container 10 is marked with the reference numeral A and the inside with the reference numeral I. Shown is in each case the upper edge region 26.2 of a lower sheet metal strip 20.2 and an upper side in the vertical upper sheet metal strip 20.1 with a lower edge region 26.1. Both metal bands 20.1, 20.2 are helically arranged extending in a plane E, wherein the plane E represents the median plane of the wall of the circular cylindrical container 10. The lower sheet-metal strip 20.2 has a bent over a bending edge 24.2 to the outside A towards upper edge portion 26.2, which forms a pointing outward A Kragflansch.

The upper sheet metal strip 20.1 has a bent over a bending edge 24.1 to the outside A down lower edge portion 26.1, which is designed U-shaped profile and the Kragflansch the upper edge portion 26.2 of the lower sheet metal strip 20.2 includes, that is, the two edge portions 26.1, 26.2 are in shape a simple seam connection 30 connected to each other load-bearing.

At the junction 50, in which the upper sheet metal strip 20.1 meets the lower sheet metal strip 20.2 is on the inside I an inner weld 40 for additional connection - in addition to the outside A Falzverbindung 30 - the upper sheet metal strip 20.1 with the lower metal strip 20.2 present.

The lower sheet-metal strip 20.2 has in the area below the joint 50 a cross-sectional embossment 34, which is inclined from bottom to top starting from the plane E substantially straight to the inside I, wherein the upper end of the cross-section embossment 34 on the second bending edge 24.2 in goes over the Kragflansch of the upper edge portion 26.2. As a result of this embodiment of the cross-sectional embossing 34, an inward-pointing projection surface 52 is formed in the region of the second bending edge 24. 2 through the upper side of the lower sheet-metal strip 20. 2 directly underneath the joint 50 and thus in the region of the joint 50 between the outer side of the upper sheet-metal strip 20 Outside of the lower sheet metal strip 20.2 an offset V available. The offset dimension can be structurally within the limits of 2 mm to 30 mm, wherein in the exemplary embodiment, the sheet thicknesses of the metal strips 20.1, 20.2 are preferably in the range between 1.5 mm to 7 mm.

The protrusion surface 52 is therefore particularly advantageous because it allows easy mounting of the inner weld 40 in the region of the joint 50. Due to the fact that the protrusion surface 52 extends horizontally in a horizontal direction, the weld metal which is still liquid during the production of the weld seam can not flow down at the beginning and a weld seam of particularly high quality can be produced in a simple manner. By producing the seaming connection 30 on the outside and the subsequent production of an internal weld seam 40 on the inside, a connection of the sheet metal strips 20.1, 20.2 is ensured, which has an extremely high density and is distinguished by an extremely high load-bearing capacity. In addition, the installation of a weld seam is particularly easy to assemble, while at the same time guaranteeing a high welding quality.

In Fig. 4 a second variant of the embodiment of the connection region is shown. Again, as in the connection according to Fig. 3 On the outside, there is a folded connection 30, but here the upper sheet-metal strip 20. 1 has a cross-sectional impression 32, which is embossed starting from the plane E from top to bottom outwards substantially rectilinearly inclined and whose lower end region merges into the lower U-profile-shaped edge portion 26.1. A protrusion surface 52 is also produced by this cross-sectional indentation 32 in the area of the joint 50, so that here as well an offset V is present between the incoming upper sheet metal strip 20.1 and the incoming lower sheet metal strip 20.2 in the area of the joint 50, which involves the application of a weld with high quality allows trouble-free and in which a drainage of the liquid during the production of weld metal down can be reliably counteracted.

In Fig. 3 the cross-sectional embossment 34 on the lower sheet metal strip 20.3 is increasingly linearly inwardly formed. According to a third in FIG. 8 illustrated embodiment, it is also possible, the cross-sectional embossment 34.1 of the lower sheet metal strip 20.2 in such a way that it is formed in the region of their impression substantially parallel and offset inwardly to the plane E. Also in this embodiment, the formation of an advantageous protrusion surface 52 is given. Likewise, the cross-sectional embossment 32 according to the embodiment in FIG Fig. 4 be replaced by a cross-sectional impression 32.1 of the upper sheet metal strip 20.1, in Fig. 9 is shown and the offset offset parallel to the outside of the plane E is stamped and merges into the over the bending edge 24.1 angled lower edge portion 26.1 of the upper sheet metal strip 20.1, so that also here a protrusion surface 52 results directly below the joint 50.

Finally, an embodiment is conceivable in which the variant according to FIG. 3 that is, formation of a cross-sectional embossment on the lower sheet metal strip 20. 2 is formed by a curved region with a large bending curvature, in which then a protrusion surface 52 is formed in the upper-side region of the joint 50.

A method for producing such a container from helically bent sheet-metal strip is for example in the EP 1181115 B1 described. Based on Figures 2 . 5a . 5b . 6 and 7 the manufacturing process is shown schematically and will be briefly described below in its essential points.

The Fig. 2 shows the top view of the container 10 and the schematically illustrated manufacturing device. The strip 20 is removed from a supply roll 36 and fed to a bending station 38 arranged within the container 10 to be produced. Within the bending station 38, the sheet-metal strip 20 is given a curvature corresponding to the desired diameter of the container 10 and the shape contours of the upper edge section 26.1 and of the lower edge section 26.2 are embossed. Then, the thus deformed sheet metal strip 20 is fed to a connection station 46, which produces the seam connection 30 by the compression of adjacent edge sections. With a downstream welder 48, the inner weld 40 is made. Depending on the type of connection (rebate connection (see FIGS. 3, 4 . 8, 9 ) or only welded fold (see FIGS. 10, 11 ), the bending station 38 may also be located outside of the container 10 and the connection station 46 are supplied.

The Fig. 5a shows the position of an upper sheet metal strip 20.1 and a lower sheet metal strip 20.2 directly in the area in front of the connection station 46, the lower sheet metal strip 20.2 height H adjustable in the radial direction R with its deformed Kragflansch upper edge portion 26.2 in the lower, already pre-deformed still open edge portion 26.1 of the upper sheet metal strip 20.1 is introduced. After insertion, the seam connection 30 is produced in the connection station 46 by pressing and then applied by means of the welder 48, the inner weld 40 and it then results in in Fig. 5b illustrated connection situation 46 with an outside hinge 30 and an inside inner weld 40.

In the FIGS. 10 and 11 are two further embodiments of a container according to the invention based on the details I of Fig. 1 shown that dispense with the use of an additional folding connection. The same components bear the same reference numerals and will not be explained again.

In the embodiment according to Fig. 10 The upper sheet-metal strip 20.1 has in its lower region a linear cross-section embossment 32 folded outwards towards the outer side A, which butt stabs the angled edge section 26.2 of the lower sheet metal strip 20.2. Between the end region of the upper sheet metal strip 20. 1 and the upper end region of the lower sheet metal strip 20. 2, an offset V is created so that the upper side of the lower sheet metal strip 20. 2 forms a projection surface 52 on the inside. The connection of the upper sheet metal strip 20.1 with the lower sheet metal strip 20.2 is produced by an inner weld 40 and an outer weld 42 (both butt welded). The height of the cross-sectional embossment 32 or its width BQ can be, for example, in the range between 5% to 30%, in particular between 10% to 20%, of the width of a sheet-metal strip 20.

In Fig. 10 a further cross-sectional embossment 32.1 is additionally shown in dashed representation, which has a greater inclination than the cross-sectional embossment 32. As a result, a larger projection surface 52 is generated. By the appropriate choice of the inclination of the cross-sectional embossment 32 or 32.1, the diameter of the container 10 can be influenced. The cross-sectional embossment 32 or 32.1 ensures reliable stabilization of the lower edge of the upper sheet-metal strip, since the sheet metal strip, in particular with thin wall thickness, tends to assume a wavy structure in the opposite free edge region when the folded lower edge section impresses, which adversely affect the subsequent welding process can. By providing one of the described cross section embossing This free edge area stabilizes and ensures a reliable welding process.

The Fig. 11 shows a further embodiment, the same basic structure as that in Fig. 10 shown detail, but with the difference that the cross-sectional impression 34 is present on the lower sheet metal strip 20.2, which is directed inwards, that is to the inside I of the container. This also creates between the lower edge region of the upper sheet metal strip 20.1 and the edge portion 26.2 of the lower sheet metal strip 20.2 an inwardly directed projection surface 52, which ensures an optimal welding process.

In these two illustrated embodiments is added as an advantage that a bearing roller 54 (in Fig. 10 shown punctured), on which the respective lower sheet metal strip 20.2 is rotatably mounted over its upper edge portion 26.2 during assembly, in terms of forces virtually no offset to the lower edge region of the upper sheet metal strip 20.1, the bearing force with increasing height of the container produced is always greater. As a result, this bearing force is absorbed centered on the bearing roller 54 and does not lead to undesirable deformations that can adversely affect the assembly process.

With the connecting construction shown can create containers that are characterized by a high sealing function, a high load capacity and a simple and economical installation. The geometric dimensions or the storage volume can be easily adapted to the respective requirement. Due to the extremely secure connection technology, such containers 10 are also suitable for use in earthquake-prone regions. By appropriate choice of the sheet thicknesses of the sheet metal strip 20 can be easily implemented container 10 with a large diameter and high height. At the same time it is also easily possible to produce container 10 with a relatively thin wall, without the Producing the inner weld seam 40 problems arise because optimal conditions are created for the production of welds due to the invention Querschnittsseinprägungen 32, 34 in the edge region of the metal strips 20.

Claims (13)

Cylindrical container (10), in particular silo for storing solids, liquids and / or gases, bulk goods or the like, - made of a single-layer, helically bent, one above the other running continuously, a cylindrical plane (E) forming sheet metal strip (20, 20.1, 20.2), - The adjacently arranged adjacent edge portions (26.1, 26.2) on a helically extending continuous joint (50) are sealingly connected together, wherein - the upper edge portion (26.2) of a lower sheet metal strip (20.2) to the container outer side (A) is angled about a second bending edge (24.2), - characterized in that - The lower edge portion (26.1) of the upper sheet metal strip (20.1) above the joint (50) to the container outer side (A) extending first cross-sectional embossment (32) or the upper edge portion (26.2) of the lower sheet metal strip (20.2) below the joint (50 ) has a cross-section embossing (34) running towards the container inside (I), in such a way that an inwardly protruding surface (52) is formed directly below the joint (50) through the adjoining upper side of the upper edge section (26.2) of the lower sheet metal strip (20.2), which in the production of an inner weld seam (40) on the inner side of the container ( I) at the height of the joint (50) counteracts the gravitational outflow of the still liquid weld metal, or prevents this. Container according to claim 1, - characterized in that - The cross-sectional impression (32, 34) has a substantially linear course. Container according to claim 1, - characterized in that - The cross-section embossing extends in an offset manner parallel to the container wall plane (E). Container according to claim 1, - characterized in that - The cross section embossing is formed as a curved region with a large bending radius. Container according to one or more of claims 1 to 4, - characterized in that - The width (BQ) of the cross section embossment (32, 34) in the range between 30% to 5% of the width of the sheet metal strip (20). Container according to one or more of claims 1 to 5, - characterized in that - The lower end portion of an upper sheet metal strip (20.1) relative to the upper end portion of the lower sheet metal strip (20.2) has a transversely to the sheet plane (E) existing offset (V). Container according to one or more of the preceding claims, - characterized in that - The plate thickness of the metal strip (20) in the range between 1 mm to 15 mm, in particular between 1.5 mm and 7 mm. Container according to one or more of claims 1 to 7, - characterized in that - Adjacent metal strips (20.1, 20.2) at the joint (50) via an inner weld (40) and an outer weld (42) are interconnected. Container according to one or more of claims 1 to 8, - characterized in that - The lower edge portion (26.1) of an upper sheet metal strip (20.1) to the container outer side (A) is angled about a first bending edge (24.1), - The angled edge portions (26.1, 26.2) at the height of the joint (50) on the container outer side (A) by means of a hinge connection (30) are interconnected, - The angled edge portions (26.1, 26.2) at the height of the joint (50) on the container inner side (I) by means of an inner weld seam (40) are interconnected, - Such that the first bending edge (24.1) in relation to the second bending edge (24.2) in a transverse to the sheet metal strip plane (E) existing offset (V) is arranged. Container according to claim 9, - characterized in that - The hinge connection (30) is designed as a simple hinge connection, in which an edge portion (26.2) of the lower sheet metal strip (20.2) as Kragflansch and an edge portion (26.1) of the upper sheet metal strip (20.1) is formed as the Kragflansch comprehensive U-profile or vice versa , Container according to claim 9, - characterized in that - The rabbet joint is designed as a multiple seam connection, in particular double seam connection. Container according to claim 6 or 9, - characterized in that - The offset dimension (V) in the range between the simple to ten times the sheet thickness of the sheet metal strip (20). Container according to one or more of the preceding claims, - characterized in that - The thickness of the inner / outer weld (40, 42) in the range between one to three times the plate thickness of the sheet metal strip (20).

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