A steel truss beam upper stiffened node plate and welding method

Abstract

The application discloses a kind of stiffened node plate on steel truss and welding method, it is related to bridge construction technical field, including: the steel truss of being provided with upper chord, the welding mechanism is arranged on the upper chord;The welding mechanism includes multiple upper welding parts and multiple lower welding parts, multiple the upper welding part is arranged on the upper end surface of upper chord in the direction of steel truss, multiple the lower welding part is arranged on the lower end surface of upper chord in the direction of steel truss, and the upper welding part includes upper stiffened node plate.The beneficial effects of the application are: by welding mechanism and upper chord, it can be manufactured in batches when prefabricating, then batch transportation is directly on site, in the process of welding, using the stress of each member in the process of incremental launching alternately changes, the stress minimum stage of the connecting position of upper stiffened node plate A and upper chord is calculated and determined, in the stage, the stress of the connecting position of upper stiffened node plate A and upper chord is eliminated by top beam measures, reaches the stress-free state of welding position.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, specifically to a stiffening node plate on a steel truss and a welding method thereon. Background Technology

[0002] In a truss, nodes are where members meet. Node plates are required at nodes to connect members and transfer and balance internal forces. Node plates are extremely important components of steel trusses. In the upper stiffening region of a continuous steel truss with stiffeners, the upper chord is connected not only to the main truss web members but also to the stiffening chord. Therefore, the upper chord here is connected to the main truss web members with node plates below and to the stiffening chord above.

[0003] Steel structure manufacturing typically employs stress-free welding, meaning that each plate is welded in a free state. After manufacturing, there are no secondary internal forces within the structure. To achieve stress-free manufacturing and ensure welding quality, the upper and lower node plates are usually manufactured as a whole with the upper chord in the factory. These components are too large and have high requirements for transportation conditions. If the component size is to be reduced, the upper node plate and the upper chord need to be manufactured separately and transported to the bridge site for on-site welding. Since the upper chord has already been installed on-site and bears the load, it is difficult to achieve stress-free welding, which poses a challenge to the welding work. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the above-mentioned background technology and provide a stiffening node plate on a steel truss and a welding method thereon.

[0005] In a first aspect, the present invention provides a stiffening node plate on a steel truss beam, comprising: a steel truss beam provided with an upper chord, wherein a welding mechanism is provided on the upper chord;

[0006] The welding mechanism includes multiple upper welding parts and multiple lower welding parts. The multiple upper welding parts are arranged parallel to each other on the upper end face of the upper chord along the direction of the steel truss beam, and the multiple lower welding parts are arranged parallel to each other on the lower end face of the upper chord along the direction of the steel truss beam.

[0007] Furthermore, the upper welding part includes an upper stiffening node plate, the lower end face of which is welded to the upper chord. The upper stiffening node plate is frustum-shaped and has an inwardly concave arc-shaped structure on its side.

[0008] Furthermore, the lower welding part includes a lower stiffening node plate, the shape of which is the same as that of the upper welding part and is disposed on the lower end face of the upper chord.

[0009] Furthermore, the welding mechanism is installed on the upper chord of the steel truss, and the upper welding part of the welding mechanism corresponds to the center of the lower welding part.

[0010] Furthermore, the steel truss also includes a support mechanism, which comprises:

[0011] Multiple web members are provided on the lower end face of the lower welded part;

[0012] The lower chord is parallel to the length of the upper chord, and multiple web members are equidistantly positioned on the upper end face of the lower chord; and

[0013] Multiple piers are spaced apart on the lower end face of the lower chord.

[0014] Furthermore, the steel truss also includes multiple stiffening vertical members and stiffening chords, the bottom of the multiple stiffening vertical members being connected to the upper end face of multiple upper welded parts, and the stiffening chords being disposed at the top of the stiffening vertical members.

[0015] Secondly, the present invention also proposes a welding method for stiffening node plates on steel trusses, including stiffening node plates on steel trusses according to any of the above-mentioned schemes, and further comprising the following steps:

[0016] The upper stiffening node plate of the upper chord and the upper welded part are manufactured separately, and the unstiffened steel truss is pushed and constructed. The minimum stress stage at the connection position between the upper stiffening node plate and the upper chord is calculated and determined.

[0017] Repeat the above steps to complete the welding of the remaining stiffening node plate connections;

[0018] Push the steel truss beams to closure, erect scaffolding, and strengthen the construction.

[0019] Furthermore, the upper chord and the upper stiffening node plate are manufactured separately and transported to the site separately;

[0020] When jacking construction is carried out on unstiffened steel trusses, only the upper chord, lower chord, web members, and bridge deck system are installed and jacked.

[0021] Furthermore, the minimum stress stage at the connection point between the upper stiffening gusset plate and the upper chord was determined by calculation using the finite element method.

[0022] The method of jacking down the beam involves setting up jacks at the support points, calculating and determining the position and height of the jacking down beam, and adjusting the height of the support points by using jacks to achieve a stress-free state at the welding position.

[0023] After the corresponding node plates are welded, adjust the jacks to return the beam supports to their original positions.

[0024] Furthermore, the welding timing for each upper stiffening node plate and the measures for jacking the beam were determined through trial calculations, so as to pause the jacking process in a timely manner and carry out welding.

[0025] Erect a support frame and apply stiffening during construction. After the frame is closed, use the welded node plates to connect the stiffening vertical rods and stiffening chords to complete the upper stiffening construction.

[0026] Compared with the prior art, the advantages of the present invention are as follows: By using the welding mechanism and the upper chord, the prefabrication can be carried out in batches and then transported to the site in batches. During the welding process, the stress of each member changes alternately during the jacking process, and the stage of minimum stress at the connection position between the upper stiffening node plate A and the upper chord is calculated and determined. At this stage, the stress at the connection position between the upper stiffening node plate A and the upper chord is eliminated by the jacking beam measure, so as to achieve a stress-free state at the welding position. Attached Figure Description

[0027] Figure 1 This is a frontal schematic diagram of the entire invention.

[0028] Figure 2 This is a schematic diagram of the pushing operation of the rod in this invention.

[0029] Figure 3 yes Figure 2 Enlarged schematic diagram.

[0030] Figure 4 This is a schematic diagram of the welding process of the present invention.

[0031] In the picture:

[0032] 1. Lower chord;

[0033] 2. Top chord;

[0034] 3. Web members;

[0035] 4. Reinforcing vertical bars;

[0036] 5. Stiffening chord;

[0037] 6. Bridge piers;

[0038] 7. Install stiffening node plates;

[0039] 8. Lower stiffening node plate. Detailed Implementation

[0040] Referring now to specific embodiments of the invention, examples of which are illustrated in the accompanying drawings. Although the invention will be described in conjunction with specific embodiments, it will be understood that it is not intended to limit the invention to the described embodiments. Rather, it is intended to cover variations, modifications, and equivalents included within the spirit and scope of the invention as defined by the appended claims. It should be noted that the method steps described herein can be implemented by any functional block or functional arrangement, and any functional block or functional arrangement can be implemented as a physical entity or a logical entity, or a combination of both.

[0041] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0042] Note: The examples described below are merely specific examples and are not intended to limit the embodiments of the present invention to the specific steps, values, conditions, data, order, etc. Those skilled in the art can utilize the concept of the present invention to construct more embodiments not mentioned herein by reading this specification.

[0043] Steel structure manufacturing typically employs stress-free welding, meaning that each plate is welded in a free state. After manufacturing, there are no secondary internal forces within the structure. To achieve stress-free manufacturing and ensure welding quality, the upper and lower node plates are usually manufactured as a whole with the upper chord in the factory. These components are too large and have high requirements for transportation conditions. If the component size is to be reduced, the upper node plate and the upper chord need to be manufactured separately and transported to the bridge site for on-site welding. Since the upper chord has already been installed on-site and bears the load, it is difficult to achieve stress-free welding, which poses a challenge to the welding work.

[0044] To address the aforementioned problems with the upper chord, this invention proposes a stiffening node plate for steel truss beams and a welding method. (See [link to relevant documentation]). Figure 1-3 This application provides a stiffening node plate 7 on a steel truss, comprising: a steel truss with an upper chord 2, wherein a welding mechanism is provided on the upper chord 2;

[0045] The welding mechanism includes multiple upper welding parts and multiple lower welding parts. The multiple upper welding parts are arranged parallel to the direction of the steel truss beam on the upper end face of the upper chord 2, and the multiple lower welding parts are arranged parallel to the direction of the steel truss beam on the lower end face of the upper chord 2.

[0046] In this application, an upper welding part and a lower welding part form a welding mechanism. There are multiple welding mechanisms, which are equally spaced along the length of the upper chord 2. The center positions of the upper welding part and the lower welding part correspond to each other, so that the lower welding part can push the upper chord 2. This facilitates the subsequent calculation of the stress at the connection position A by the upper welding part, and makes it easier to eliminate stress during subsequent welding.

[0047] In one possible implementation, the lower welded part is larger in volume than the upper welded part, and mounting openings can be provided on both sides of the lower end face of the lower welded part. The size of the mounting openings is adapted to the web member 3, and the inner wall of the mounting openings is a smooth structure to facilitate the subsequent installation of the structure and the lower welded part.

[0048] Based on the above embodiments, in this embodiment, the upper welding part includes an upper stiffening node plate 7. The lower end face of the upper stiffening node plate 7 is welded to the upper chord 2. The upper stiffening node plate 7 is frustum-shaped and the side is a concave arc structure.

[0049] In this embodiment, the upper stiffening node plate 7 can be made of metal and is consistent with other structures. The upper end face of the upper stiffening node plate 7 is welded to the stiffening vertical rod 4 or is integrally set. The shape of the upper end face of the upper stiffening node plate 7 is the same as that of the stiffening vertical rod 4.

[0050] In this application, the upper stiffening node plate 7 is a frustum shape that is narrower at the top and wider at the bottom. The outer edge of the lower end face of the upper stiffening node plate 7 protrudes onto the upper chord 2, which facilitates the subsequent welding of the upper stiffening node plate 7 and the upper chord 2 by the staff.

[0051] In one possible implementation, the edge of the lower end face of the upper stiffening node plate 7 can be square or triangular, etc., but the shape and size of the upper end face of the upper stiffening node plate 7 are always the same as those of the stiffening vertical bar 4.

[0052] Based on the above embodiments, in this embodiment, the lower welding part includes a lower stiffening node plate 8, which has the same shape as the upper welding part and is disposed on the lower end face of the upper chord 2.

[0053] In this embodiment, the lower stiffening node plate 8 and the upper stiffening node plate 7 have the same shape, but the lower stiffening node plate 8 is larger than the upper stiffening node plate 7, which makes it easier to fix the web member 3 in the lower stiffening node plate 8 later.

[0054] In this embodiment, the welding mechanism is installed on the upper chord of the steel truss, and the upper welding part of the welding mechanism corresponds to the center of the lower welding part.

[0055] In this application, the steel truss beam as a whole includes an upper chord 2, which is one of the structures of the steel truss beam. The welding mechanism provided on the upper chord 2 can be connected to other structures of the steel truss beam.

[0056] Based on the above embodiments, in this embodiment, the steel truss also includes a support mechanism, which includes: multiple web members 3, disposed on the lower end face of the lower welded part; a lower chord 1, disposed parallel to the length direction of the upper chord 2, and the multiple web members 3 are disposed at equal intervals on the upper end face of the lower chord 1; and multiple piers 6, spaced apart on the lower end face of the lower chord 1.

[0057] In this embodiment, the web members 3 are arranged between the lower stiffening node plate 8 and the lower chord 1. The web members 3 are arranged in pairs, inside the lower stiffening node plate 8, and connected to the upper chord 2. The two web members 3 are inclined to each other at an angle inside the lower stiffening node plate 8, and the center point where the two web members 3 are connected corresponds to the center point of the upper stiffening node plate 7.

[0058] Based on the above embodiments, in this embodiment, the steel truss also includes multiple stiffening vertical members 4 and stiffening chord members 5. The bottom of the multiple stiffening vertical members 4 is connected to the upper end face of multiple upper welded parts, and the stiffening chord members 5 are arranged at the top of the stiffening vertical members 4.

[0059] In this embodiment, multiple stiffening vertical bars 4 are arranged in parallel on the upper stiffening node plate 7, and they match the upper stiffening node plate 7. The lengths of the multiple stiffening vertical bars 4 are different, and the lengths of the multiple stiffening vertical bars 4 gradually increase or decrease, with the same magnitude of length change. The stiffening chords 5 are distributed in an arc shape, and the curves are set at the top of the multiple stiffening vertical bars 4 to connect the multiple stiffening vertical bars 4.

[0060] This application embodiment also provides a stiffening node plate on a steel truss and a welding method, including a stiffening node plate on a steel truss and the following steps:

[0061] The upper chord 2 and the upper stiffening node plate 7 of the upper welded part are manufactured separately, and the unstiffened steel truss beam is pushed and constructed. The minimum stress stage at the connection position between the upper stiffening node plate 7 and the upper chord 2 is calculated and determined.

[0062] Repeat the above steps to complete the welding of the remaining upper stiffening node plate 7 connection parts;

[0063] Push the steel truss beams to closure, erect scaffolding, and strengthen the construction.

[0064] Based on the above embodiments, in this embodiment, the upper chord 2 and the upper stiffening node plate 7 are manufactured separately and transported to the site separately;

[0065] When jacking construction is carried out on unstiffened steel trusses, only the upper chord 2, lower chord 1, web members 3, and bridge deck system are installed and jacked.

[0066] Based on the above embodiments, in this embodiment, the minimum stress stage at the connection position between the upper stiffening node plate 7 and the upper chord 2 is calculated and determined using the finite element method;

[0067] The method of jacking down the beam involves setting up jacks at the support points, calculating and determining the position and height of the jacking down beam, and adjusting the height of the support points by using jacks to achieve a stress-free state at the welding position.

[0068] After the corresponding node plates are welded, adjust the jacks to return the beam supports to their original positions.

[0069] Based on the above embodiments, in this embodiment, the welding timing and beam-lifting measures for each upper stiffening node plate 7 are determined by trial calculation, so as to pause the jacking process in a timely manner and carry out welding.

[0070] Erect a support frame and reinforce the structure. After the frame is closed, use the welded node plate to connect the stiffening vertical rod 4 and the stiffening chord to complete the upper stiffening construction.

[0071] In the description of this invention, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0072] It should be noted that in this invention, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0073] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features of the invention herein.

Claims

1. A welding method for stiffening gusset plates on steel trusses, characterized in that, A stiffening node plate is used on a steel truss beam. The stiffening node plate on the steel truss beam includes: a steel truss beam with an upper chord (2) and a welding mechanism on the upper chord (2); The welding mechanism includes multiple upper welding parts and multiple lower welding parts. The multiple upper welding parts are arranged parallel to each other along the direction of the steel truss beam on the upper end face of the upper chord (2), and the multiple lower welding parts are arranged parallel to each other along the direction of the steel truss beam on the lower end face of the upper chord (2). The upper welding part includes an upper stiffening node plate (7), the lower end face of the upper stiffening node plate (7) is welded to the upper chord (2), the upper stiffening node plate (7) is frustum-shaped and the side is a concave arc structure; The lower welding part includes a lower stiffening node plate (8), the shape of which is the same as that of the upper welding part, and is disposed on the lower end face of the upper chord (2); The steel truss also includes a support mechanism, which comprises: Multiple web members (3) are provided on the lower end face of the lower welded part; The lower chord (1) is arranged parallel to the length of the upper chord (2), and multiple web members (3) are arranged at equal intervals on the upper end face of the lower chord (1); and Multiple piers (6) are spaced apart on the lower end face of the lower chord (1); The two web members (3) are arranged in a group of two. The two web members (3) are inclined to each other at an angle and are set inside the lower stiffening node plate (8) and connected to the upper chord (2). The center point of the connection between the two web members (3) corresponds to the center point of the upper stiffening node plate (7). The welding method further includes the following steps: After the upper chord (2) and the upper stiffening node plate (7) are manufactured separately, they are transported to the site separately. When jacking construction is carried out on an unstiffened steel truss, only the upper chord (2), lower chord (1), web members (3), and bridge deck system are installed and jacked. The minimum stress stage at the connection position between the upper stiffening node plate (7) and the upper chord (2) was determined by calculation using the finite element method. The method of jacking down the beam involves setting up jacks at the support points, calculating and determining the position and height of the jacking down beam, and adjusting the height of the support points by using jacks to achieve a stress-free state at the welding position. After the welding of the corresponding node plates is completed, adjust the jacks to return the beam support to its original position; The timing for welding each upper stiffening node plate (7) and the measures for jacking the beam were determined by trial calculations, so that the jacking could be paused in time during the jacking process and welding could be carried out. Repeat the above steps to complete the welding of the remaining upper stiffening node plate (7) connection; erect the support, construct the upper stiffening, and after closing, use the welded node plate to connect the stiffening vertical rod (4) and the stiffening chord to complete the upper stiffening construction.

2. The welding method for stiffening node plates on a steel truss as described in claim 1, characterized in that, The steel truss also includes multiple stiffening vertical members (4) and stiffening chord members (5). The bottom of the multiple stiffening vertical members (4) is connected to the upper end face of multiple upper welded parts, and the stiffening chord members (5) are set at the top of the stiffening vertical members (4).

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