Telescopic compensation device, beam structure and steel structure

Abstract

The utility model relates to the technical field of steel structures, and provides a telescopic compensation device, a beam structure and a steel structure.The telescopic compensation device comprises a sleeve, a connecting piece and a sliding piece, and the sleeve comprises a left section, a middle section and a right section which are sequentially and continuously arranged in the axial direction of the sleeve; the two opposite side walls of the left section and the two opposite side walls of the right section are provided with long-strip-shaped holes in the same direction respectively, the length direction of the long-strip-shaped holes is consistent with the axial direction of the sleeve, the left section and the right section are used for being connected into the ends of two adjacent cross beams in a sleeved mode respectively, the connecting pieces penetrate through the long-strip-shaped holes and then are used for being connected with the cross beams, and the sliding pieces are connected to the outer wall of the sleeve. The sleeve is in sliding connection with the inner wall of the cross beam through the sliding piece. By means of the structural arrangement, the stability and reliability of the whole connecting structure are guaranteed, meanwhile, effective and stable telescopic compensation can be smoothly and reliably conducted on extrusion and pulling deformation caused by stress generated when the cross beam is subjected to temperature change, and the structural stability of the steel structure is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of steel structures, and in particular to a telescopic compensation device, a beam structure and a steel structure. Background Art

[0002] Steel structures are characterized by ease and speed of construction, as well as their robustness. However, in natural environments, steel components expand and contract with temperature fluctuations. These changes in temperature cause them to expand or contract, creating constraining stresses. Therefore, the impact of temperature stress on steel components cannot be ignored, especially in areas with large temperature differences.

[0003] In the existing technology, for example, in a steel truss structure, the larger the cross-section of the steel component, the greater the stress and deformation generated. For a steel guardrail as a type of steel structure, the greater the rigidity of the steel guardrail column, the greater the constraint on the beam. The stress formed by the temperature of the steel guardrail beam will cause the beam to be squeezed and stretched, and in severe cases, it may cause undesirable phenomena such as breakage and damage. Utility Model Content

[0004] The technical problem to be solved by the utility model is: how to improve the structural stability of the steel structure.

[0005] On the one hand, the utility model provides a telescopic compensation device, including a sleeve, a connecting piece and a sliding piece, the sleeve including a left section, a middle section and a right section arranged in sequence along its axial direction, and the two opposite side walls of the left section and the two opposite side walls of the right section are respectively provided with long strip holes along the same direction, the length direction of the long strip holes is consistent with the axial direction of the sleeve, the left section and the right section are respectively used to be sleeved in the end parts of two adjacent sections of the beam, the connecting piece is used to connect with the beam after passing through the long strip holes, the sliding piece is connected to the outer wall of the sleeve, and the sleeve is used to be slidably connected to the inner wall of the beam through the sliding piece.

[0006] Optionally, there are multiple sliding members, two of which are connected to the lower outer walls at both axial ends of the left section, and the other two sliding members are connected to the lower outer walls at both axial ends of the right section.

[0007] Optionally, the sliding member is a pulley, and the pulley is rotatably connected to the lower outer wall of the sleeve.

[0008] Optionally, the sliding member is a rolling ball structure, the lower outer wall of the sleeve is provided with a groove adapted to the rolling ball structure, and the rolling structure is rollingly connected in the groove.

[0009] Optionally, the left segment and the right segment are symmetrically arranged relative to the middle segment.

[0010] Optionally, the elongated holes are waist-shaped holes, and there are multiple elongated holes, which are spaced apart along the axial directions of the left section and the right section.

[0011] Optionally, the telescopic compensation device further includes a connecting hole structure, which is used to be opened on the beam and corresponds to the number and position of the elongated holes. The connecting member is a threaded member, and the connecting member is connected to the connecting hole structure.

[0012] Optionally, the outer wall of the middle section is provided with scale lines.

[0013] Compared with the prior art, the telescopic compensation device provided by the utility model has the following technical effects:

[0014] The telescopic compensation device provided by the present invention can be applied to steel structures, such as steel guardrails in large steel truss structures, by arranging a sleeve, and arranging the sleeve to be a left section, a middle section and a right section arranged in sequence along its axial direction. When in use, the left section and the right section of the sleeve can be respectively sleeved in the end portions of two adjacent sections of the beam, that is, the entire section of the beam can be divided into multiple sections. At this time, the middle section of the sleeve can be exposed outside the beam, that is, located between the two sections of the beam, so that the displacement of the beam caused by thermal expansion and contraction due to temperature changes can be compensated. At the same time, by opening long strip holes in the opposite side walls of the left section and the opposite side walls of the right section respectively in the same direction, and setting the length direction of the long strip holes to be consistent with the axial direction of the sleeve, that is, setting it to be consistent with the axial direction of the beam, and by passing the connecting piece through the long strip hole and then connecting it to the beam The connection ensures the stability of the overall structure. When the beam is subjected to temperature changes and produces thermal expansion and contraction, that is, when displacement occurs along its axial direction, the connecting piece can move relative to the long hole along the length direction of the long hole, that is, it does not hinder the left and right sections of the sleeve from sliding relative to each other in the ends of the two adjacent beams, and thus the beam will not be damaged by extrusion and stretching deformation. In addition, by arranging a sliding piece on the outer wall of the sleeve for sliding connection with the inner wall of the beam, it is more convenient for the sleeve and the beam to form a sliding connection structure, which can prevent the stress caused by temperature changes from affecting the shape of the beam structure, and prevent the sliding connection between the sleeve and the beam from failing after the beam is deformed, so that the beam and the sleeve can still smoothly compensate for the expansion and contraction displacement after thermal expansion and contraction, thereby ensuring the stability and reliability of the overall structure. Through the above structural setting, while ensuring the stability and reliability of the overall connection structure, it can smoothly and reliably achieve effective and stable expansion and contraction compensation for the extrusion and stretching deformation caused by the stress caused by temperature changes on the beam, thereby improving the structural stability of the steel structure using the above beam.

[0015] On the other hand, the present invention further provides a beam structure comprising at least two cross beams and the above-mentioned telescopic compensation device.

[0016] Compared with the prior art, the beam structure provided by the present invention has substantially the same technical effect as that of the above-mentioned telescopic compensation device by setting the above-mentioned telescopic compensation device, and will not be described in detail here.

[0017] In addition, the utility model also provides a steel structure, including the above-mentioned beam structure.

[0018] Compared with the prior art, the steel structure provided by the present invention has substantially the same technical effects as those of the above-mentioned beam structure by setting the above-mentioned beam structure, and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of a steel guardrail according to an embodiment of the present utility model;

[0020] Figure 2 This is a schematic structural diagram of the telescopic compensation device according to an embodiment of the utility model when in use;

[0021] Figure 3 This is a schematic structural diagram of a sleeve according to an embodiment of the present utility model;

[0022] Figure 4 This is a structural diagram of the beam structure of an embodiment of the utility model.

[0023] Description of reference numerals:

[0024] 10-sleeve, 11-left section, 12-middle section, 13-right section, 14-long hole, 15-scale line, 20-connecting part, 30-sliding part, 40-connecting hole structure, 01-beam, 02-column. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0026] It should be noted that the terms "first," "second," and the like in the specification and claims of the present invention and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, such that the embodiments of the present invention described herein can be implemented in an order other than that illustrated or described herein.

[0027] In the description of the present invention, the directions or positional relationships indicated by “up”, “down”, “left”, “right”, “top”, “bottom”, “front”, “back”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings and are only used to facilitate the description of the present invention. They do not indicate or imply that the device referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention.

[0028] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0029] Throughout this specification, references to the terms "embodiment," "one embodiment," and "one implementation" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or implementation are included in at least one embodiment or implementation of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or implementation. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or implementations.

[0030] In order to solve the above technical problems, on the one hand, Figures 1 to 3 As shown, an embodiment of the utility model provides a telescopic compensation device, characterized in that it includes a sleeve 10, a connecting member 20 and a sliding member 30, the sleeve 10 includes a left section 11, a middle section 12 and a right section 13 arranged in sequence along its axial direction, and the opposite side walls of the left section 11 and the opposite side walls of the right section 13 are respectively provided with long strip holes 14 along the same direction, the length direction of the long strip holes 14 is consistent with the axial direction of the sleeve 10, the left section 11 and the right section 13 are respectively used to be sleeved in the end parts of two adjacent sections of the beam 01, the connecting member 20 is used to be connected to the beam 01 after passing through the long strip holes 14, the sliding member 30 is connected to the outer wall of the sleeve 10, and the sleeve 10 is used to be slidably connected to the inner wall of the beam 01 through the sliding member 30.

[0031] It should be noted that if Figure 1As shown, the crossbeam 01 in this embodiment does not only refer to the crossbeam 01 in the steel guardrail, but can also be a steel beam or steel pipe in other steel structures, such as a steel truss, which has a similar structure to the crossbeam 01. Of course, for example, the steel beam or steel pipe has a hollow structure inside, at least its end is a hollow structure, which is used to sleeve the sleeve 10 of the telescopic compensation device. Figure 1 Taking the steel guardrail shown as an example, it includes vertically arranged columns 02, and a beam structure is connected between the two columns 02. The beam structure includes segmented cross beams 01. When applying the present telescopic compensation device, the beam structure can be pre-divided into several sections. During installation, the sleeve 10 of the telescopic compensation device is sleeved into the ends of two adjacent cross beams 01 that are close to each other to achieve telescopic compensation of the stress and deformation of the two adjacent cross beams 01.

[0032] Specifically, the sleeve 10 can be a square tube or a round tube. Preferably, the sleeve 10 is a round tube structure, which is more conducive to forming a relative sliding connection structure with the beam 01, that is, it is more conducive to forming telescopic compensation for the stress and deformation of the beam 01. Of course, the shape of the sleeve 10 is compatible with the shape of the beam 01 and can be designed according to actual needs. No specific limitation is made here. At the same time, the beam 01 is specifically divided into several sections, which can also be designed according to the actual installation environment, such as temperature difference, and the material of the beam 01, the stress size and deformation amount generated by temperature. In addition, the left section 11, the middle section 12 and the right section 13 of the sleeve 10 can be an integrally formed structure, that is, for example Figure 3 As shown in the figure, the left section 11, the middle section 12 and the right section 13 are integrally formed into a whole to form the sleeve 10, and the structure is more stable and reliable. In general, during installation, the width of the gap left between the two adjacent sections of the beam 01 corresponds to the size of the middle section 12, and the length of the middle section 12 along its axial direction should be greater than the maximum deformation of the two adjacent sections of the beam 01 to prevent the two adjacent sections of the beam 01 from being squeezed and damaged by each other due to stress deformation caused by temperature changes.

[0033] In this embodiment, the telescopic compensation device provided by this embodiment can be applied to steel structures, such as steel guardrails in large steel truss structures, by providing a sleeve 10, and providing the sleeve 10 as a left section 11, a middle section 12 and a right section 13 which are successively provided along its axial direction. When in use, the left section 11 and the right section 13 of the sleeve 10 can be respectively sleeved in the ends of two adjacent sections of the beam 01, that is, the entire section of the beam 01 can be split into multiple sections. At this time, the middle section 12 of the sleeve 10 can be exposed outside the beam 01, that is, located between the two sections of the beam 01, so that the displacement of the beam 01 caused by thermal expansion and contraction due to temperature changes can be compensated. At the same time, by opening long strip holes 14 in the opposite side walls of the left section 11 and the opposite side walls of the right section 13 in the same direction, and setting the length direction of the long strip holes 14 to be consistent with the axial direction of the sleeve 10, that is, to be consistent with the axial direction of the beam 01, and by passing the connecting piece 20 through the long strip holes 1 4 and then connected to the crossbeam 01. While ensuring the overall stability of the structure, when the crossbeam 01 is subjected to temperature changes and produces thermal expansion and contraction, that is, when it is displaced along its axial direction, the connecting piece 20 can move relative to the elongated hole 14 along the length direction of the elongated hole 14, that is, it does not hinder the left section 11 and the right section 13 of the sleeve 10 from sliding relative to each other in the ends of the two adjacent crossbeams 01, and thus the crossbeam 01 will not produce damage or other adverse phenomena caused by extrusion and drawing deformation. In addition, by arranging a sliding piece 30 on the outer wall of the sleeve 10 for sliding connection with the inner wall of the crossbeam 01, it is more convenient for the sleeve 10 and the crossbeam 01 to form a sliding connection structure, which can prevent the stress caused by temperature changes from affecting the structural shape of the crossbeam 01, and prevent the sliding connection between the sleeve 10 and the crossbeam 01 from failing after the crossbeam 01 is deformed, so that the crossbeam 01 and the sleeve 10 can still smoothly compensate for the expansion and contraction after thermal expansion and contraction, thereby ensuring the stability and reliability of the overall structure. Through the above structural setting, while ensuring the stability and reliability of the overall connection structure, it is possible to smoothly and reliably achieve effective and stable expansion and contraction compensation for the extrusion and tension deformation caused by the stress formed by temperature changes in the beam 01, thereby improving the structural stability of the steel structure using the above beam 01.

[0034] Alternatively, as Figure 2 and Figure 3 As shown, there are multiple sliding members 30, two of which are connected to the lower outer walls at both axial ends of the left section 11, and the other two sliding members 30 are connected to the lower outer walls at both axial ends of the right section 13.

[0035] Specifically, if Figure 2As shown, there are four sliding members 30, which are respectively connected to the axial ends of the left section 11 and the axial ends of the right section 13. The so-called lower outer wall, that is, the lower side of the outer wall of the left section 11 and the right section 13, means that due to gravity, the sliding member 30 is arranged at the bottom, which is more conducive to forming a sliding connection structure between the sleeve 10 and the inner wall of the beam 01, that is, it is more conducive to forming a telescopic compensation structure.

[0036] In this embodiment, by setting the number of sliding members 30 to be multiple and connecting them in pairs to the lower outer walls of the axial ends of the left section 11 and the axial ends of the right section 13, on the one hand, it is more conducive to ensuring the stability of the connection between the sleeve 10 as a whole and the two sections of the beam 01. Due to gravity, the sliding members 30 set in pairs can also provide stable support for the sleeve 10, thereby improving the stability and reliability of the overall structure. On the other hand, it is more conducive to forming a sliding connection structure between the sleeve 10 and the inner wall of the beam 01. After the beam 01 is squeezed and deformed by temperature, it is more convenient for the sleeve 10 and the beam 01 to slide relative to each other, thereby further improving the structural stability.

[0037] Alternatively, as Figure 2 and Figure 3 As shown, the sliding member 30 is a pulley, which is rotatably connected to the lower outer wall of the sleeve 10.

[0038] Specifically, a pin can be set on the lower outer wall of the left section 11 and the right section 13 of the sleeve 10 to rotate the connecting pulley, or it can be set as a groove or a card slot and other structures, and the pulley is embedded in the lower outer wall of the left section 11 and the right section 13, which can also realize the relative sliding of the sleeve 10 and the beam 01.

[0039] In this embodiment, by setting the sliding member 30 as a pulley and rotatably connecting it to the lower outer wall of the sleeve 10, it is easier for the sleeve 10 and the beam 01 to slide relative to each other, which is more conducive to the expansion and contraction compensation of the stress deformation of the beam 01.

[0040] Alternatively, as Figure 2 and Figure 3 As shown, the sliding member 30 is a rolling ball structure, and a groove adapted to the rolling ball structure is formed on the lower outer wall of the sleeve 10 , and the rolling ball structure is rollingly connected in the groove.

[0041] Specifically, the rolling ball structure can be a steel ball or other structural parts, and the structure is more solid and reliable.

[0042] In this embodiment, by setting the sliding member 30 as a ball structure and opening a groove adapted thereto on the lower outer wall of the sleeve 10, the ball structure is connected in the groove to form a rolling connection structure, which not only ensures the convenience of relative sliding between the sleeve 10 and the beam 01, but also makes the ball structure more stable and firm, thereby improving the firmness and reliability of the overall structure.

[0043] Alternatively, as Figure 2 and Figure 3 As shown, the left section 11 and the right section 13 are symmetrically arranged relative to the middle section 12 .

[0044] Specifically, the structures and dimensions of the left section 11 and the right section 13 are set to be the same, which is convenient for production and processing, and is convenient for forming a symmetrical structure, thereby improving structural stability.

[0045] In this embodiment, by arranging the left section 11 and the right section 13 symmetrically relative to the middle section 12, when the left section 11 and the right section 13 are respectively sleeved into the ends of two adjacent sections of the beam 01, a symmetrical connection structure can be formed, which makes the structure more stable. At the same time, it is more conducive to making the deformation displacement of the beam 01 controllable and adjustable, which is convenient for product design and production.

[0046] Alternatively, as Figure 2 and Figure 3 As shown, the elongated holes 14 are waist-shaped holes, and there are multiple elongated holes 14 , which are spaced apart along the axial direction of the left section 11 and the right section 13 .

[0047] Specifically, the number of the elongated holes 14 can be set according to actual needs, for example, according to the length of the sleeve 10, the length of the beam 01, etc. For example, three pairs of elongated holes 14 are respectively provided on the left section 11 and the right section 13. A pair of elongated holes 14 is two and passes through the sleeve 10 in the same direction, which is convenient for connection with the connecting piece 20.

[0048] In this embodiment, by setting the elongated holes 14 as waist-shaped holes, and setting them as a structural form spaced apart along the axial direction of the left section 11 and the right section 13, on the one hand, the waist-shaped holes are more convenient for production and processing, and are convenient for forming a standard structure, that is, it is convenient to design and produce elongated holes 14 of the required size according to actual conditions; on the other hand, multiple elongated holes 14 are more conducive to improving the stability of the structure, making the connection structure more stable and reliable.

[0049] Alternatively, as Figures 2 to 4 As shown, the telescopic compensation device also includes a connecting hole structure 40, which is used to be opened on the beam 01 and corresponds to the number and position of the long holes 14. The connecting member 20 is a threaded member, and the connecting member 20 is connected to the connecting hole structure 40.

[0050] Specifically, the connecting member 20 is a threaded member composed of a bolt and a nut. The connecting hole structure 40 opened on the beam 01 can be a threaded hole or a pupil. Of course, its hole diameter is adapted to the bolt.

[0051] In this embodiment, by opening a connecting hole structure 40 on the beam 01 corresponding to the number and position of the long holes 14, it is more convenient to connect the sleeve 10 and the beam 01, that is, it is more convenient to stably connect the beam 01 and the connecting member 20. At the same time, by setting the connecting member 20 as a threaded member, it is easy to install and disassemble, and the firmness of the overall structure is also improved.

[0052] Alternatively, as Figure 3 As shown, the outer wall of the middle section 12 is provided with scale lines 15 .

[0053] Specifically, the scale lines 15 can be provided on the outer wall of the middle section 12 by etching or painting. Furthermore, the scale lines 15 can include short lines representing small units and long lines representing large units, such as on a ruler, to facilitate rapid determination of stress and deformation under the current environment and structural materials, facilitating preliminary acoustic field preparation operations such as structural dimension design and material selection. Of course, the deformation can also be obtained by on-site measurement using a ruler, for example.

[0054] In this embodiment, by setting scale lines 15 on the outer wall of the middle section 12, it is convenient to quickly determine the stress and deformation under the current environment and the current structural material, that is, by obtaining the scale at which the end of the beam 01 is located after the initial installation and the scale at which the end of the beam 01 is located after the temperature change, the stress and deformation displacement generated by the beam 01 under the current environment can be known, which is convenient for providing reference data for subsequent or other situations, that is, it is convenient to provide reasonable and reliable data reference for the overall structural design, which is convenient for product design and production.

[0055] On the other hand, Figure 1 and Figure 4 As shown, another embodiment of the present invention provides a beam structure, including at least two end cross beams 01 and the above-mentioned telescopic compensation device.

[0056] Exemplarily, the beam structure is a segmented structure, such as a beam structure arranged transversely in a steel guardrail, which can be a steel beam, steel pipe or other structure, and the interior of the steel beam or steel pipe is a hollow structure, or at least its end is a hollow structure, for being used to sleeve the sleeve 10 of the above-mentioned telescopic compensation device.

[0057] In this embodiment, the beam structure provided in this embodiment has substantially the same technical effect as that of the above-mentioned telescopic compensation device by providing the above-mentioned telescopic compensation device, and thus will not be described in detail here.

[0058] In addition, if Figure 1 As shown, another embodiment of the present invention provides a steel structure including the above-mentioned beam structure.

[0059] Exemplarily, the steel structure is a steel guardrail, comprising interconnected columns 02 and the aforementioned beam structure consisting of multiple sections of beams 01.

[0060] In this embodiment, the steel structure provided in this embodiment has substantially the same technical effect as that of the above-mentioned beam structure by setting the above-mentioned beam structure, and will not be described in detail here.

[0061] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A telescopic compensation device, characterized in that: The invention comprises a sleeve (10), a connecting piece (20) and a sliding piece (30), wherein the sleeve (10) comprises a left section (11), a middle section (12) and a right section (13) which are arranged in sequence along the axial direction thereof, and two opposite side walls of the left section (11) and two opposite side walls of the right section (13) are respectively provided with long holes (14) in the same direction, and the length direction of the long holes (14) is consistent with the axial direction of the sleeve (10), and the left section (11) and the right section (13) are respectively used for sleeve-connecting the ends of two adjacent sections of the cross beam (01), and the connecting piece (20) is used for connecting to the cross beam (01) after passing through the long holes (14), and the sliding piece (30) is connected to the outer wall of the sleeve (10), and the sleeve (10) is used for sliding connection with the inner wall of the cross beam (01) through the sliding piece (30).

2. The telescopic compensation device according to claim 1, characterized in that: The number of the sliding members (30) is multiple, wherein two of the sliding members (30) are connected to the lower outer walls at the two axial ends of the left section (11), and the other two of the sliding members (30) are connected to the lower outer walls at the two axial ends of the right section (13).

3. The telescopic compensation device according to claim 1, characterized in that: The sliding member (30) is a pulley, and the pulley is rotatably connected to the lower outer wall of the sleeve (10).

4. The telescopic compensation device according to claim 1, characterized in that: The sliding member (30) is a rolling ball structure, and a groove matching the rolling ball structure is formed on the lower outer wall of the sleeve (10), and the rolling ball structure is rollingly connected in the groove.

5. The telescopic compensation device according to claim 1, characterized in that: The left section (11) and the right section (13) are symmetrically arranged relative to the middle section (12).

6. The telescopic compensation device according to claim 1, characterized in that: The elongated holes (14) are waist-shaped holes, and there are a plurality of the elongated holes (14). The plurality of elongated holes (14) are spaced apart along the axial direction of the left section (11) and the right section (13).

7. The telescopic compensation device according to claim 6, characterized in that: The telescopic compensation device further comprises a connecting hole structure (40), wherein the connecting hole structure (40) is used to be opened on the crossbeam (01) and corresponds to the number and position of the elongated holes (14); the connecting member (20) is a threaded member, and the connecting member (20) is connected to the connecting hole structure (40).

8. The telescopic compensation device according to claim 1, characterized in that: The outer wall of the middle section (12) is provided with scale lines (15).

9. A beam structure, characterized in that: It comprises at least two cross beams (01) and a telescopic compensation device as claimed in any one of claims 1 to 8.

10. A steel structure, characterized in that: Comprising the beam structure as claimed in claim 9.

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