A manufacturing method of a box-shaped bridge chord

Abstract

The invention discloses a manufacturing method of a box - type bridge chord, which includes: first, for the box - girder wall panels, butt - joint the thick and thin plates on a horizontal jig, pre - scribe and position the center lines of the gusset plates, butt - joint plates and the connection web member joints, and assemble and weld the stiffening ribs and stiffening plates to the box - girder wall panels; install the transverse stiffening diaphragms inside the box body; install another box - girder wall panel; hoist the top plate, and pre - assemble and weld the top plate with the stiffening ribs, and the weld between the stiffening ribs and the top plate is a full - penetration weld; hoist the transverse diaphragms outside the box body of the outer side of the box - girder wall panels onto the jig in sequence; hoist the bottom - plate unit onto the jig for assembly and positioning; then install and weld the first support and a group of second supports. Through a reasonable construction method, different welding methods are adopted for installation and welding according to the different installation positions of different components, the manufacturing quality of the entire box - type bridge chord can be effectively improved, the stability of its connection with the bridge deck and the box - type end beam can be ensured, and its support performance, load - bearing performance and safety in later use can be guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field of steel structure buildings, and particularly relates to a manufacturing method for a box-shaped bridge chord member. Background Art

[0002] Most traditional bridges are made of reinforced concrete, which has a long construction period and is easily affected by the environment, affecting the entire construction period. Steel structure buildings are less affected by the construction environment and have a shorter construction period, so they have been widely used in recent years.

[0003] A chord member refers to the upper and lower peripheral members of a truss. The upper member is called the upper chord member, and the lower member is called the lower chord member. Whether it is the upper chord member or the lower chord member, they are not independently arranged in the bridge. Most of them need to be connected to other components. Especially for the lower chord member, it not only needs to be vertically connected to the upper chord member, but also needs to be horizontally connected to the bridge deck and the end beam. The assembly difficulty between each component is relatively large. The existing chord members do not have so many connection nodes. When installing, a lot of adapters are needed to achieve the connection, which not only increases the construction cost, but also increases the construction difficulty and prolongs the construction period. Summary of the Invention

[0004] Object of the Invention: To overcome the above deficiencies, the object of the present invention is to provide a manufacturing method for a box-shaped bridge chord member. Through a reasonable construction method, the box-shaped bridge chord member is reasonably manufactured and constructed. Different welding methods are used for welding according to the different installation positions of different components, which can effectively improve the manufacturing quality of the entire box-shaped bridge chord member, ensure the stability of its connection with the bridge deck and the box-shaped end beam, and ensure its supportability, load-bearing capacity and safety in later use.

[0005] Technical Solution: To achieve the above object, the present invention provides a manufacturing method for a box-shaped bridge chord member, including the following specific manufacturing method for the box-shaped bridge chord member: 1): First, the box girder web plates are butt-welded for thick and thin plates on a horizontal jig. The center lines of the gusset plates, butt plates and the connection web member nodes are pre-scored and positioned. The stiffeners and stiffening plates are assembled and welded with the box girder web plates. After welding and rectification to be qualified, they are lifted onto the jig for positioning, that is: a 1‰ welding shrinkage is added in the length direction of the box girder web plate and the gusset plate is made upright, and a 10 mm allowance is added at the other end; a 1‰ welding shrinkage allowance is added in the length direction of the longitudinal stiffeners for cutting; a 179.5° reverse deformation is pressed at the position corresponding to the center of the stiffeners on the box girder web plate; a full penetration weld is used between the stiffeners and the box girder web plate; the stiffening plates and the box girder web plates are welded by the way of full penetration welds, with a single-sided 40° root opening of 2 mm, and the reverse fillet weld is strengthened and ground flat and tightened with the stiffeners;

[0006] 2): Install the horizontal stiffening diaphragms inside the installation box. When positioning and installing, the horizontal stiffening diaphragms are vertically arranged with the box girder web plates. Among them, for the 3 diaphragms located in the first support node area, there is a single-sided fillet weld between the diaphragm and the top plate, and the other three sides are full-penetration welds. The form of the double-sided 40° root opening of 2 mm is adopted between the diaphragm and the box girder web plates, and the form of the single-sided 40° root opening of 2 mm is adopted between the diaphragm and the bottom plate. The groove direction of the bottom plate side of the two side diaphragms and the groove direction of the bottom plate side of the middle diaphragm face the manhole side; when the stiffening rib grooves on the diaphragm are not enlarged in the drawing, the groove should be enlarged by 2 mm on each side during lofting; for the diaphragms in the non-node area, the three sides between the diaphragm and the web plates and the top plate are in the form of double-sided fillet welds, and the contact with the bottom plate is ground flat and tight. During the construction process, when the stiffening rib grooves on the diaphragm are not enlarged in the drawing, the groove should be enlarged by 2 mm on each side during lofting;

[0007] 3): Install another box girder web plate. When positioning, align the node center line, the position line of the port tongue-and-groove, and the perpendicularity;

[0008] 4): After the positioning of the box girder web plate in the previous step is qualified, hoist the top plate. The top plate is pre-assembled and welded with the stiffening ribs, and the weld between the stiffening rib and the top plate is a full-penetration weld; the node area between the top plate and the web plate is a full-penetration weld, and the form of the internal weld and external root cleaning groove is adopted; the other positions are full-penetration welds, and the fillet welds are used for strengthening outside the end diaphragm;

[0009] 5): After the welding of the top plate is qualified, hoist the outer box diaphragms of the box girder web plate onto the jig in sequence. When positioning and installing, the outer box diaphragms should be vertically arranged with the box girder web plates. During the manufacturing process, the weld between the outer box diaphragms in the non-node area and the box girder web plates is a full-penetration weld, and the weld between the outer box diaphragms in the non-node area and the top plate is a double-sided fillet weld; 2 mm is added to each side of the groove on the outer box diaphragms;

[0010] 6): After the positioning of the outer box diaphragms is qualified, hoist the bottom plate unit onto the jig for assembly and positioning. When positioning, align the node center line, the position line of the port tongue-and-groove, and the perpendicularity. The specific welding method is as follows: 1‰ welding shrinkage is added in the length direction of the bottom plate and the node plate is made correctly, and 10 mm allowance is added to the other end; the weld between the bottom plate and the box girder web plates is a full-penetration weld, and the form of the single-sided 40° root opening of 2 mm is adopted in the node area. When the plate thickness > 40 mm, the form of the single-sided 30° root opening of 2 mm is adopted; the weld between the bottom plate and the outer box diaphragms is a double-sided fillet weld, and the single-sided fillet weld form is required between the diaphragm at the port and the bottom plate.

[0011] 7): Then weld and install the first support and a group of second supports.

[0012] The specific manufacturing method of the first support in the present invention is as follows:

[0013] 1): Weld the support top plate. Pre-fabricate the support top plate and weld U-shaped ribs and first stiffeners on it. Both the U-shaped ribs and the first stiffeners are welded to the support top plate in the form of double-sided welds. The butt joint of the support top plate adopts the form of internal welding and external root clearing welding groove. The first stiffeners and small stiffening plates are all double-sided fillet welds with the frame;

[0014] 2): The fillet weld with full penetration between the stiffener at the node on the box girder web plate and the box girder web plate adopts the form of double-sided 40° root remaining 2mm groove, and there is no R hole in the middle of this stiffener;

[0015] 3): Assemble and weld the support node plate. First, pre-assemble and weld the middle support node plate, which is welded to the frame in the form of a full penetration weld, and adopts the form of double-sided 40° root remaining 2mm groove on all four sides;

[0016] 4): Assemble and weld the internal transverse diaphragm of the support. The internal transverse diaphragm of the support is all fillet welds with full penetration with the frame, and adopts the form of double-sided 40° root remaining 2mm groove with the support top plate; it adopts the form of single-sided 40° root remaining 2mm groove with the support wall plates on both sides, and the groove faces outward;

[0017] 5): Assemble and weld the support bottom plate. The support bottom plate is full penetration welded with the body node plate, and adopts the form of internal welding and external root clearing groove. And the fillet weld between the stiffener at the node on the box girder web plate and the support bottom plate is in the form of double-sided fillet weld. The internal transverse diaphragm of the support and the support bottom plate adopt the form of double-sided 40° root remaining 2mm groove;

[0018] 6): Assemble and weld the remaining support node plates. The remaining support node plates are assembled and welded by the method of backward installation. The weld with the frame is a fillet weld with full penetration, and adopts the form of single-sided 40° root remaining 2mm groove on all four sides;

[0019] 7): Assemble and weld the support wall plates. The support wall plates are all welded to the frame in the form of fillet welds with full penetration, and adopt the form of single-sided 30° root remaining 2mm groove, and the groove faces outward. The inside and outside of the internal transverse diaphragm of the support are strengthened by fillet welds; The notch on the support wall plate is cut with a 4mm enlargement, and the U-shaped ribs and long strip stiffeners are double-sided fillet welds with the support wall plates;

[0020] 8): Assemble and weld the long strip stiffening plates and small block stiffening plates. The long strip stiffening plates and small block stiffening plates on the outside of the support wall plates are all welded to the support wall plates in the form of fillet welds with full penetration, and adopt the form of double-sided 40° root remaining 2mm groove. The small block stiffening plates on the outside are fillet welds with full penetration, and adopt the form of single-sided 40° root remaining 2mm groove; The long strip stiffening plates on the inside of the support wall plates are fillet welds with full penetration, and adopt the form of single-sided 40° root remaining 2mm groove, and are installed by the method of backward installation.

[0021] The specific manufacturing method of the chord end beam assembly in the present invention is as follows:

[0022] 1): Weld the butt web plate. The root of the stiffener plate of the butt web member within a range of 200 mm needs to be fully penetrated by welding. The internal welding and external root clearing groove form is adopted, and the rest positions are penetration welds. When the plate thickness ≤ 20 mm, the single-sided 40° root-retaining 2 mm groove form is adopted; when the plate thickness > 20 mm, the double-sided 40° root-retaining 2 mm groove form is adopted.

[0023] 2): Weld the sealing plate. The single-sided 40° root-retaining 2 mm groove form is adopted for welding between the sealing plate and the two gusset plates. The full penetration welding is adopted between the lifting lug and the framework, and the root clearing welding groove form is adopted.

[0024] The specific manufacturing method of the second support in the present invention is as follows:

[0025] 1): First, perform H-shaped closing for the second support, and the H-shaped closing is welded with double-sided fillet welds.

[0026] 2): Weld the cover plate of the second support. The cover plate of the second support and the H-shaped closing are penetration welds, and the single-sided 40° root-retaining 2 mm groove form is adopted for welding.

[0027] 3): After the self-closing of the second support is completed, the penetration welds are adopted between the second support and the framework, and the single-sided 40° root-retaining 2 mm groove form is adopted, with the groove facing outward.

[0028] 4): The double-sided fillet welds are adopted between the small stiffener plates in the second support and the main body and between the stiffener ribs.

[0029] The box girder chord member in the present invention includes: a bottom plate, a group of box girder wall plates, a top plate, a chord end beam assembly, a first support and a group of second supports. The box girder wall plates are arranged oppositely and are arranged on the bottom plate. The top plate is arranged above the two box girder wall plates. The chord end beam assembly is arranged above the top plate. The first support is arranged below the bottom plate and is arranged in the opposite direction to the chord end beam assembly. The second support is arranged on the top plate.

[0030] The bottom plate in the present invention includes a bottom plate body. Lower bracket gusset plates are symmetrically arranged on both sides of the bottom plate body. A group of box body outer transverse diaphragms are arranged between the lower bracket gusset plates and the outer edge plate of the top plate, and patch plates are arranged at both ends of the top plate.

[0031] The box girder wall plate in the present invention includes a box girder wall plate body. A gusset plate for installing the chord end beam assembly is arranged above the box girder wall plate body. The first support is arranged outside the box girder wall plate body. A group of stiffening ribs are arranged on the inner walls of the box girder wall plate and the top plate. Stiffener plates are arranged on the stiffening ribs. A group of transverse stiffening diaphragms are arranged between the two box girder wall plates, and the transverse stiffening diaphragms are simultaneously connected to the stiffening ribs on the inner walls of the box girder wall plate and the top plate.

[0032] The diaphragm includes a diaphragm body, and a set of mounting grooves for mounting stiffeners are provided on the side of the diaphragm body.

[0033] In the present invention, the chord end beam assembly includes a set of butt webs and a set of sealing plates. The butt webs are arranged between two gusset plates. The sealing plates are arranged between two gusset plates and are connected to the butt webs, and the sealing plates are arc-shaped.

[0034] In the present invention, the first support includes a set of support top plates, a set of support gusset plates, a set of support inner diaphragms, a support bottom plate and a set of support inner diaphragms. The support top plates are arranged on the outside of the top plates. The support gusset plates are oppositely arranged on the bottom plate. The support inner diaphragms are arranged between the support gusset plates. The support bottom plate is arranged at the bottom of the support gusset plates. The support inner diaphragms are vertically arranged between the support top plates and the support bottom plates, and support wall plates are provided on both sides of the support inner diaphragms;

[0035] Long strip stiffening plates are provided on both the inner and outer sides of the support wall plates, and small block stiffening plates are also provided between the long strip stiffening plates on the outside of the support wall plates;

[0036] U-shaped ribs and a set of first stiffeners are provided on the support top plates.

[0037] In the present invention, mounting grooves are provided on three sides of the stiffening plate, and the mounting grooves are herringbone hole grooves. The setting of the mounting grooves facilitates the installation of the stiffeners, further optimizes the structure of the chord, and can improve the stability of the installation of the stiffeners; the setting of the herringbone hole grooves improves the stability of the installation of the stiffeners by virtue of the particularity of its structure.

[0038] From the above technical solutions, it can be seen that the present invention has the following beneficial effects:

[0039] 1. For the manufacturing method of a box girder chord of the present invention, through a reasonable construction method, the box girder chord is reasonably manufactured and constructed. Different welding methods are used for welding according to the different installation positions of different components, which can effectively improve the manufacturing quality of the entire box girder chord, ensure its connection stability with the bridge deck and the box girder end beam, and ensure its supportability, load-bearing capacity and safety in later use.

[0040] 2. The box girder chord described in the present invention has a simple structure, reasonable design and is easy to manufacture. By arranging a chord end beam assembly on the top plate, it is convenient to connect with other box girders. The setting of the first support facilitates its connection with the box girder end beam. The setting of the second support facilitates its connection with the bridge deck, realizes multi-directional connection, reduces the use of other transition parts, optimizes the structure of the chord, shortens the construction period, and enables it to better meet the needs of bridge construction.

[0041] 3. In the present invention, the bottom plate includes a bottom plate body. Symmetrically arranged on both sides of the bottom plate body are lower bracket gusset plates. A set of webs are provided between the lower bracket gusset plates and the outer edge plates of the top plate, and patch plates are provided at both ends of the top plate. The arrangement of the webs greatly improves the connection stability between the bottom plate, the top plate, and the side wall plates. At the same time, patch plates are also provided at both ends of the top plate, further improving the stability of the entire chord structure.

[0042] 4. In the present invention, the chord end beam assembly includes a set of butt webs and a set of sealing plates. The arrangement of the butt webs and the sealing plates can effectively improve the stability of the chord end beam structure, further enhancing the connection stability, load-bearing capacity, and safety during later use.

[0043] 5. The stability of the first support structure in the present invention greatly improves the connection stability with the box-shaped end beam, further enhancing the stability and safety of the entire structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a schematic structural diagram of the manufacturing method of the box-shaped bridge chord in the present invention;

[0045] Figure 2 It is a schematic installation diagram of the support top plate in the present invention;

[0046] Figure 3 It is a partial structural schematic diagram of the box girder wall plate in the present invention;

[0047] Figure 4 It is a schematic installation diagram of the first support in the present invention;

[0048] Figure 5 It is a schematic structural diagram of the diaphragm in the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0049] The present invention will be further clarified below with reference to the drawings and specific embodiments. Embodiment

[0050] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0051] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0052] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality of" is two or more, unless otherwise clearly defined.

[0053] In the present invention, unless otherwise clearly specified and defined, the terms "mounted", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0054] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0055] Example 1

[0056] A manufacturing method of a box - type bridge chord member described in this embodiment includes the following specific manufacturing methods for the box - type bridge chord member: 1): First, for the box - girder web plate 2, the splicing and butt - welding of thick and thin plates are carried out on a horizontal jig. The center lines of the gusset plate, butt - joint plate, and the connection web - member nodes are pre - scribed and positioned. The stiffening rib 23 and the stiffening plate 24 are assembled and welded to the box - girder web plate 2. After welding and passing the rectification inspection, it is hoisted onto the jig for positioning, that is: a 1‰ welding shrinkage is added in the length direction of the box - girder web plate 2, and the gusset plate is made straight. A 10 - mm allowance is added at the other end; a 1‰ welding shrinkage allowance is added in the length direction for the longitudinal stiffening rib during blanking; a 179.5° reverse deformation is pressed at the position corresponding to the center of the stiffening rib 23 on the box - girder web plate 2; a full - penetration weld is used between the stiffening rib 23 and the box - girder web plate 2; the stiffening plate 24 is welded to the box - girder web plate 2 by means of a full - penetration weld, with a single - side 40° root - opening of 2 mm, and the reverse side is strengthened by a fillet weld, and it is ground and tightly abutted against the stiffening rib 23;

[0057] 2): Install the transverse stiffening diaphragms 25 inside the box. When positioning and installing, the transverse stiffening diaphragms 25 are vertically arranged with the box - girder web plate 2. Among them, for the 3 diaphragms located in the node area of the first support 5, a single - side fillet weld is used between the diaphragms and the top plate, and full - penetration welds are used for the other three sides. A double - side 40° root - opening of 2 mm is used between the diaphragms and the box - girder web plate 2, and a single - side 40° root - opening of 2 mm is used between the diaphragms and the bottom plate. The groove - opening direction of the bottom - plate side of the two side diaphragms is..., and the groove - opening direction of the bottom - plate side of the middle diaphragm faces the man - hole side; If the rib - slot on the diaphragm is not enlarged in the drawing, the slot should be enlarged by 2 mm on each side during lofting; For the diaphragms in non - node areas, 3 - sided double - side fillet welds are used between the diaphragms and the web plate and the top plate, and they are ground and tightly abutted against the bottom plate. During the construction process, if the rib - slot on the diaphragm is not enlarged in the drawing, the slot should be enlarged by 2 mm on each side during lofting;

[0058] 3): Install another box - girder web plate 2. When positioning, align the node center line, the port tongue - and - groove position line, and the perpendicularity;

[0059] 4): After the box - girder web plate 2 in the previous step is positioned and qualified, hoist the top plate 3. The top plate 3 is pre - assembled and welded with the stiffening rib 23. A full - penetration weld is used between the stiffening rib 23 and the top plate 3; The node area between the top plate 3 and the web plate is fully penetrated and welded, using an internal - welding and external - root - clearing groove form; For the remaining positions, full - penetration welds are used, and fillet welds are used for strengthening outside the end diaphragm;

[0060] 5): After the top plate 3 is welded and qualified, hoist the outer - side box - body transverse diaphragms 13 of the box - girder web plate 2 onto the jig in sequence. When positioning and installing, the outer - side box - body transverse diaphragms 13 should be vertically arranged with the box - girder web plate 2. During the manufacturing process, full - penetration welds are used between the non - node - area outer - side box - body transverse diaphragms 13 and the box - girder web plate 2, and double - side fillet welds are used between the non - node - area outer - side box - body transverse diaphragms 13 and the top plate 3; A 2 - mm allowance is added to each side of the groove on the outer - side box - body transverse diaphragm during blanking;

[0061] 6): After the lateral diaphragm 13 of the box body is positioned qualified, lift the bottom plate 1 unit onto the jig for assembly and positioning. When positioning, align the node center line, the position line of the port tongue-and-groove, and the perpendicularity. The specific welding method is as follows: Add a 1‰ welding shrinkage in the length direction of the bottom plate 1 and make the node plate correct. Add a 10 mm allowance at the other end; The weld between the bottom plate 1 and the box girder wall plate 2 is a full-penetration weld. The node area uses a single-sided 40° root opening of 2 mm. When the plate thickness > 40 mm, use a single-sided 30° root opening of 2 mm; The weld between the bottom plate 1 and the external diaphragm 13 of the box body is a double-sided fillet weld, and a single-sided fillet weld form is required between the diaphragm at the port and the bottom plate 1.

[0062] 7): Then weld and install the first support 5 and a group of second supports 6.

[0063] The specific manufacturing method of the first support 5 in this embodiment is as follows:

[0064] 1): Weld the support top plate 51. First, pre-manufacture the support top plate 51 and weld the U-shaped rib 511 and the first stiffening rib 512 on it. The U-shaped rib 511 and the first stiffening rib 512 are both welded to the support top plate 51 by double-sided welds. The butt joint of the support top plate 51 uses an internal welding and external root cleaning weld groove form. The first stiffening rib 512 and the small stiffening plate are both double-sided fillet welds with the framework;

[0065] 2): The stiffening rib at the node on the box girder wall plate 2 and the box girder wall plate 2 are full-penetration welds, using a double-sided 40° root opening of 2 mm, and there is no R hole in the middle of this stiffening rib;

[0066] 3): Weld and install the support node plate 52. First, pre-weld and install the middle support node plate 52, which is welded to the framework by a full-penetration weld form and uses a four-sided double-sided 40° root opening of 2 mm;

[0067] 4): Weld and install the internal diaphragm 55 of the support. The internal diaphragm 55 of the support is a full-penetration weld with the framework, and uses a double-sided 40° root opening of 2 mm with the support top plate 51; It uses a single-sided 40° root opening of 2 mm with the two-sided support wall plates 56, and the groove faces outward;

[0068] 5): Weld and install the support bottom plate 54. The support bottom plate 54 and the body node plate are full-penetration welded and use an internal welding and external root cleaning groove form. The stiffening rib at the node on the box girder wall plate 2 and the support bottom plate 54 are double-sided fillet welds. The internal diaphragm 55 of the support and the support bottom plate 54 use a double-sided 40° root opening of 2 mm;

[0069] 6): Weld and install the remaining support node plates 52. The remaining support node plates 52 are welded and installed by the back-off method, which is a full-penetration weld with the framework and uses a four-sided single-sided 40° root opening of 2 mm;

[0070] 7): Weld the support wall panel 56. The support wall panel 56 and the framework are welded by full penetration welds. A single-sided 30° root opening of 2 mm is used, and the groove faces outward. The inner and outer sides of the transverse diaphragm 55 inside the support are strengthened by fillet welds. The notch on the support wall panel 56 is cut with a 4 mm enlargement, and double-sided fillet welds are used between the U-ribs and the long stiffening ribs and the support wall panel 56.

[0071] 8): Weld the long stiffening plate 57 and the small stiffening plate. The long stiffening plate 57 and the small stiffening plate on the outer side of the support wall panel 56 are welded to the support wall panel 56 by full penetration welds. A double-sided 40° root opening of 2 mm is used. The small stiffening plate on the outer side is a full penetration weld with a single-sided 40° root opening of 2 mm. The long stiffening plate 57 on the inner side of the support wall panel 56 is a full penetration weld with a single-sided 40° root opening of 2 mm and is installed by the reverse installation method.

[0072] The specific manufacturing method of the chord end beam assembly 4 in this embodiment is as follows:

[0073] 1): Weld the butt web 41. The root of the stiffening plate of the butt web member within a range of 200 mm needs to be welded with full penetration. An internal welding and external root cleaning groove form is used. The remaining positions are full penetration welds. When the plate thickness ≤ 20 mm, a single-sided 40° root opening of 2 mm is used; when the plate thickness > 20 mm, a double-sided 40° root opening of 2 mm is used.

[0074] 2): Weld the closure plate 42. A single-sided 40° root opening of 2 mm is used for welding between the closure plate 42 and the two gusset plates 22. The lifting lug and the framework are welded with full penetration, and a root cleaning weld groove form is used.

[0075] The specific manufacturing method of the second support 6 in this embodiment is as follows:

[0076] 1): First, perform H-shaped closure on the second support 6, and the H-shaped closure is welded with double-sided fillet welds.

[0077] 2): Weld the second support cover plate. The second support cover plate and the H-shaped closure are full penetration welds, and a single-sided 40° root opening of 2 mm is used for welding.

[0078] 3): After the second support 6 is self-closed, all the welds between the second support 6 and the framework are full penetration welds, with a single-sided 40° root opening of 2 mm, and the groove faces outward.

[0079] 4): The double-sided fillet welds are used between the small stiffening plates corresponding to the second support 6 and the body and the stiffening ribs.

[0080] Embodiment 2

[0081] A manufacturing method of a box - type bridge chord member as shown in the figure. The box - type bridge chord member includes: a bottom plate 1, a group of box - girder wall plates 2, a top plate 3, a chord - end beam assembly 4, a first support 5 and a group of second supports 6. The box - girder wall plates 2 are arranged oppositely and are provided on the bottom plate 1. The top plate 3 is provided above the two box - girder wall plates 2. The chord - end beam assembly 4 is provided above the top plate 3. The first support 5 is provided below the bottom plate 1 and is arranged in the opposite direction to the chord - end beam assembly 4. The second support 6 is provided on the top plate 3.

[0082] In this embodiment, the bottom plate 1 includes a bottom - plate body 11. On both sides of the bottom - plate body 11, lower bracket gusset plates 12 are symmetrically provided. Between the lower bracket gusset plates 12 and the outer edge plate of the top plate 3, a group of outer - box transverse diaphragms 13 are provided. And at both ends of the top plate 3, patch plates 14 are provided.

[0083] In this embodiment, the box - girder wall plate 2 includes a box - girder - wall - plate body 21. Above the box - girder - wall - plate body 21, gusset plates 22 for installing the chord - end beam assembly 4 are provided. The first support 5 is provided outside the box - girder - wall - plate body 21. On the inner walls of both the box - girder wall plate 2 and the top plate 3, a group of stiffening ribs 23 are provided. On the stiffening ribs 23, stiffening plates 24 are provided. And between the two box - girder wall plates 2, a group of transverse stiffening diaphragms 25 are provided. And the transverse stiffening diaphragms 25 are simultaneously connected to the stiffening ribs 23 on the inner walls of both the box - girder wall plate 2 and the top plate 3.

[0084] The diaphragm 24 includes a diaphragm body. On the side of the diaphragm body, a group of installation grooves 251 for installing the stiffening ribs 23 are provided.

[0085] In this embodiment, the chord - end beam assembly 4 includes a group of butt webs 41 and a group of closure plates 42. The butt webs 41 are provided between the two gusset plates 22. The closure plates 42 are provided between the two gusset plates 22 and are connected to the butt webs 41. And the closure plates 42 are in an arc shape.

[0086] In this embodiment, the first support 5 includes a group of support top plates 51, a group of support gusset plates 52, a group of support inner diaphragms 53, a support bottom plate 54 and a group of support inner transverse diaphragms 55. The support top plates 51 are provided outside the top plate 1. The support gusset plates 52 are oppositely provided on the bottom plate 1. The support inner diaphragms 53 are provided between the support gusset plates 52. The support bottom plate 54 is provided at the bottom of the support gusset plates 52. The support inner transverse diaphragms 55 are vertically provided between the support top plates 51 and the support bottom plates 54. And on both sides of the support inner transverse diaphragms 55, support wall plates 56 are provided.

[0087] On both the inner and outer sides of the support wall plates 56, long strip stiffening plates 57 are provided. And between the long strip stiffening plates 57 on the outer side of the support wall plates 57, small - block stiffening plates are also provided.

[0088] The bearing top plate 51 is provided with a U-shaped rib 511 and a group of first stiffening ribs 512.

[0089] In this embodiment, mounting grooves 241 are provided on three sides of the stiffening plate 24, and the mounting grooves 241 are herringbone hole grooves.

[0090] In this embodiment, a manufacturing method of a box-shaped bridge chord includes the following specific manufacturing methods of the box-shaped bridge chord: 1): First, the box girder web plates 2 are subjected to butt joint of thick and thin plates on a horizontal jig. The center lines of the gusset plates, butt joint plates and the connection web member nodes are pre-scored and positioned, and the stiffening ribs 23 and the stiffening plates 24 are assembled and welded to the box girder web plates 2. After welding and rectification to be qualified, they are hoisted onto the jig for positioning, that is: a 1‰ welding shrinkage is added in the length direction of the box girder web plate 2 and the gusset plates are made upright, and a 10 mm allowance is added at the other end; a 1‰ welding shrinkage allowance is added in the length direction of the longitudinal stiffening ribs for cutting; a 179.5° reverse deformation is pressed at the center position of the box girder web plate 2 corresponding to the stiffening rib 23; a full penetration weld is used between the stiffening rib 23 and the box girder web plate 2; the stiffening plate 24 and the box girder web plate 2 are welded by means of a full penetration weld, and a single-sided 40° root opening of 2 mm is adopted, and the reverse fillet weld is strengthened and ground flat and tightened with the stiffening rib 23;

[0091] 2): Install the transverse stiffening diaphragms 25 inside the box body. When positioning and installing, the transverse stiffening diaphragms 25 are vertically arranged with the box girder web plates 2. Among them, single-sided fillet welds are used between the 3 diaphragms located in the node area of the first support 5 and the top plate, and full penetration welds are used for the other three sides. A double-sided 40° root opening of 2 mm is adopted between the transverse stiffening diaphragms and the box girder web plates 2, and a single-sided 40° root opening of 2 mm is adopted between the transverse stiffening diaphragms and the bottom plate. The groove direction of the bottom plate side of the two side diaphragms and the groove direction of the bottom plate side of the middle diaphragm face the side with the manhole; if the stiffening rib grooves on the diaphragms are not enlarged in the drawing, the grooves need to be enlarged by 2 mm on each side during lofting; in the non-node area, 3 sides between the diaphragms and the web plates and the top plate are in the form of double-sided fillet welds, and are ground flat and tightened with the bottom plate. During the construction process, if the stiffening rib grooves on the diaphragms are not enlarged in the drawing, the grooves need to be enlarged by 2 mm on each side during lofting;

[0092] 3): Install another box girder web plate 2. When positioning, align the node center line, the port tongue-and-groove position line and the perpendicularity;

[0093] 4): After the box girder web plate 2 in the previous step is positioned and qualified, hoist the top plate 3. The top plate 3 is pre-assembled and welded with the stiffening rib 23, and a full penetration weld is used between the stiffening rib 23 and the top plate 3; the node area between the top plate 3 and the web plate is full penetration welded, and an internal welding and external root cleaning groove form is adopted; full penetration welds are used for the remaining positions, and fillet welds are used for strengthening outside the end diaphragms;

[0094] 5): After the top plate 3 is welded and qualified, the outer box cross diaphragms 13 of the box girder wall plates 2 are successively hoisted onto the jig. When positioning and installing, the outer box cross diaphragms 13 and the box girder wall plates 2 need to be vertically arranged. During the manufacturing process, for the non-node areas, the weld between the outer box cross diaphragms 13 and the box girder wall plates 2 is a full penetration weld, and the weld between the outer box cross diaphragms 13 and the top plate 3 is a double-sided fillet weld; for the notches on the outer box cross diaphragms, add 2 mm for each side during blanking.

[0095] 6): After the outer box cross diaphragms 13 are positioned and qualified, hoist the bottom plate 1 unit onto the jig for assembly and positioning. When positioning, align the node center line, the port tongue-and-groove position line, and the perpendicularity. The specific welding method is as follows: Add 1‰ welding shrinkage in the length direction of the bottom plate 1 and make the node plate correct, and add 10 mm allowance at the other end; the weld between the bottom plate 1 and the box girder wall plates 2 is a full penetration weld. For the node area, use a single-sided 40° root opening of 2 mm. When the plate thickness > 40 mm, use a single-sided 30° root opening of 2 mm; the weld between the bottom plate 1 and the outer box cross diaphragms 13 is a double-sided fillet weld, and a single-sided fillet weld form is required between the cross diaphragm at the port and the bottom plate 1.

[0096] 7): Then weld and install the first support 5 and a group of second supports 6.

[0097] In this embodiment, the specific manufacturing method of the first support 5 is as follows: 1): Weld the support top plate 51. First, pre-manufacture the support top plate 51, and weld the U-shaped rib 511 and the first stiffening rib 512 on it. The U-shaped rib 511 and the first stiffening rib 512 are both welded to the support top plate 51 by double-sided welds. The butt joint of the support top plate 51 uses an internal welding and external root cleaning weld groove form. The first stiffening rib 512 and the small stiffening plate are both double-sided fillet welds with the framework.

[0098] 2): The stiffening rib at the node on the box girder wall plate 2 is a full penetration weld with the box girder wall plate 2, using a double-sided 40° root opening of 2 mm, and there is no R hole in the middle of this stiffening rib.

[0099] 3): Weld and install the support node plate 52. First, pre-weld and install the middle support node plate 52, which is welded to the framework by a full penetration weld form, and uses a four-sided double-sided 40° root opening of 2 mm.

[0100] 4): Weld and install the inner cross diaphragm 55 of the support. The inner cross diaphragm 55 of the support is a full penetration weld with the framework, and uses a double-sided 40° root opening of 2 mm with the support top plate 51; it uses a single-sided 40° root opening of 2 mm with the support wall plates 56 on both sides, and the groove faces outward.

[0101] 5): Weld and install the support base plate 54. The support base plate 54 is fully penetrated and welded to the main body joint plate, and the internal welding and external root clearing groove form is adopted. Moreover, the fillet weld form is used between the stiffening rib at the joint on the box girder web plate 2 and the support base plate 54; the double-sided 40° root remaining 2mm groove form is adopted between the internal transverse diaphragm 55 of the support and the support base plate 54;

[0102] 6): Weld and install the remaining support joint plates 52. The remaining support joint plates 52 are welded and installed by the method of reverse installation. The penetration weld is used between them and the framework, and the four-sided single-sided 40° root remaining 2mm groove form is adopted;

[0103] 7): Weld and install the support wall plate 56. The support wall plate 56 is welded to the framework by the penetration weld method, and the single-sided 30° root remaining 2mm groove form is adopted, and the groove faces outward. The inner and outer sides outside the internal transverse diaphragm 55 of the support are strengthened by fillet welds; The notch on the support wall plate 56 is cut with a 4mm enlargement, and the double-sided fillet weld is used between the U-rib and the long strip stiffening rib and the support wall plate 56;

[0104] 8): Weld and install the long strip stiffening plate 57 and the small block stiffening plate. The long strip stiffening plate 57 and the small block stiffening plate on the outside of the support wall plate 56 are welded to the support wall plate 56 by the penetration weld form, and the double-sided 40° root remaining 2mm groove form is adopted. The small block stiffening plate on the outside is a penetration weld, and the single-sided 40° root remaining 2mm groove form is adopted; The long strip stiffening plate 57 on the inside of the support wall plate 56 is a penetration weld, and the single-sided 40° root remaining 2mm groove form is adopted, and the reverse installation method is used for installation.

[0105] In this embodiment, the specific manufacturing method of the chord end beam assembly 4 is as follows:

[0106] 1): Weld and install the butt web 41. The root of the stiffening plate of the butt web member needs to be fully penetrated and welded within a range of 200mm, and the internal welding and external root clearing groove form is adopted. The remaining positions are penetration welds. When the plate thickness ≤ 20mm, the single-sided 40° root remaining 2mm groove form is adopted; when the plate thickness > 20mm, the double-sided 40° root remaining 2mm groove form is adopted;

[0107] 2): Weld and install the sealing plate 42. The sealing plate 42 is welded to the two joint plates 22 by the single-sided 40° root remaining 2mm groove form, and the full penetration weld is used between the lifting lug and the framework, and the root clearing weld groove form is adopted.

[0108] In this embodiment, the specific manufacturing method of the second support 6 is as follows:

[0109] 1): First, perform the H-shaped closing of the second support 6, and the H-shaped closing is welded by double-sided fillet welds;

[0110] 2): Weld and install the second support cover plate. The second support cover plate and the H-shaped closing are penetration welds, and the single-sided 40° root remaining 2mm groove form is adopted for welding;

[0111] 3): After the second support 6 is self-closed, the welds between the second support 6 and the framework are all full penetration welds. The single-sided 40° root opening of 2 mm is adopted, and the groove faces outward;

[0112] 4): The fillet welds on both sides are used between the small stiffening plates in the second support 6 and the body and the stiffening ribs.

[0113] In the manufacturing method of a box-shaped bridge chord described in this embodiment, the butt joint method between the processed box-shaped bridge chord and the bridge deck is as follows:

[0114] A. The butt joint between the bridge deck top plate and the lower chord top plate is a ceramic backing plate weld. The groove is 40° with a root opening of 2 mm and a gap of 6 mm (equally divided on both sides), and the groove faces upward;

[0115] B. The butt joint between the web of the transverse T-rib of the bridge deck and the outer diaphragm 13 of the box body is a ceramic backing plate weld. The groove is 40° with a root opening of 2 mm and a gap of 6 mm (equally divided on both sides), and the groove faces the center of the bridge length direction;

[0116] C. The butt joint between the lower panel of the transverse T-rib of the bridge deck and the lower chord bracket gusset plate is a ceramic backing plate weld. The groove is 40° with a root opening of 2 mm and a gap of 6 mm (equally divided on both sides), and the groove faces upward.

[0117] In the manufacturing method of a box-shaped bridge chord described in this embodiment, the butt joint method between the box-shaped end beam and the lower chord end truss in the processed box-shaped bridge chord is as follows:

[0118] A. The butt joint between the web of the box-shaped bracket of the lower chord end beam and the web of the box-shaped end beam is a ceramic backing plate weld. The groove is 40° with a root opening of 2 mm and a gap of 6 mm (equally divided on both sides), and the groove faces outward;

[0119] B. The butt joint between the bottom plate of the box-shaped bracket and the support bottom plate 54 in the box-shaped end beam is a ceramic backing plate weld. The groove is 40° with a root opening of 2 mm and a gap of 6 mm (equally divided on both sides), and the groove faces the inside of the box body;

[0120] C. The butt joint between the top plate of the box-shaped bracket and the support top plate 51 in the box-shaped end beam is a ceramic backing plate weld. The groove is 40° with a root opening of 2 mm and a gap of 6 mm (equally divided on both sides), and the groove faces upward.

[0121] The butt joint method between the box-shaped bridge chords in this embodiment is as follows:

[0122] A. The web butt joint is a ceramic backing plate weld. The groove is 40° with a root opening of 2 mm and a gap of 6 mm (equally divided on both sides), and the groove faces the outside of the box body;

[0123] B. The bottom plate butt joint is a ceramic backing plate weld. The groove is 40° with a root opening of 2 mm and a gap of 6 mm (equally divided on both sides), and the groove faces the inside of the box body;

[0124] C. The butt joint of the top plate is welded with a ceramic backing plate. The groove angle is 40°, the root face is 2 mm, and the gap is 6 mm (equally divided on both sides). The groove faces upward.

[0125] D. The periphery of the hole filling section is welded with a ceramic backing plate. The groove angle is 40°, the root face is 2 mm, and the gap is 6 mm (equally divided on both sides). The groove faces upward.

[0126] E. The stiffener filling section on the web is welded with a ceramic backing plate. The groove angle is 40°, the root face is 2 mm, and the gap is 6 mm (equally divided on both sides). The groove faces upward.

[0127] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements can be made, and these improvements should also be regarded as the protection scope of the present invention.

Claims

1. A manufacturing method of a box-shaped bridge chord, characterized in that: The specific manufacturing method of the box girder chord is as follows: 1): For the box girder web plate (2), first carry out the butt joint of thick and thin plates on the horizontal jig. The center lines of the gusset plate, butt joint plate and the connecting web member nodes are pre-scored and positioned. Assemble and weld the stiffening ribs (23) and stiffening plates (24) to the box girder web plate (2). After welding and rectifying to be qualified, lift it onto the jig for positioning, that is: add 1‰ welding shrinkage in the length direction of the box girder web plate (2) and make the gusset plate correct, add 10mm allowance at the other end; add 1‰ welding shrinkage allowance for cutting in the length direction of the longitudinal stiffening rib; press a 179.5° reverse deformation at the center position of the box girder web plate (2) corresponding to the stiffening rib (23); the weld between the stiffening rib (23) and the box girder web plate (2) is a full penetration weld; the weld between the stiffening plate (24) and the box girder web plate (2) is carried out by the way of full penetration weld, adopting a single-sided 40° root opening of 2mm, strengthening with a fillet weld on the reverse side, and grinding and butting tightly with the stiffening rib (23); 2): Install the transverse stiffening diaphragm (25) inside the box body. When positioning and installing, the transverse stiffening diaphragm (25) is vertically arranged with the box girder web plate (2). Among them, for the 3 diaphragms located in the node area of the first support (5), the weld between them and the top plate is a single-sided fillet weld, and the other three sides are full penetration welds. The form of the double-sided 40° root opening of 2mm is adopted between them and the box girder web plate (2), and the form of the single-sided 40° root opening of 2mm is adopted between them and the bottom plate. The groove direction of the bottom plate side of the two side diaphragms, and the groove direction of the bottom plate side of the middle diaphragm faces the manhole side; If the stiffening rib notch on the diaphragm is not enlarged in the drawing, the notch needs to be enlarged by 2mm on each side during lofting; For the diaphragms in the non-node area, the 3 sides between the diaphragm and the web plate and the top plate are in the form of double-sided fillet welds, and the connection with the bottom plate is grinding and butting tightly. During the construction process, if the stiffening rib notch on the diaphragm is not enlarged in the drawing, the notch needs to be enlarged by 2mm on each side during lofting; 3): Install another box girder web plate (2). When positioning, align the node center line, the port tongue-and-groove position line and the perpendicularity; 4): After the box girder web plate (2) in the previous step is positioned and qualified, hoist the top plate (3). The top plate (3) is pre-assembled and welded with the stiffening rib (23). The weld between the stiffening rib (23) and the top plate (3) is a full penetration weld; The node area between the top plate (3) and the web plate is full penetration, adopting the form of internal welding and external root cleaning groove; The other positions are full penetration welds, and the area outside the end diaphragm is strengthened with fillet welds; 5): After the top plate (3) is welded and qualified, hoist the outer box transverse diaphragm (13) of the box girder web plate (2) onto the jig in turn. When positioning and installing, the outer box transverse diaphragm (13) and the box girder web plate (2) need to be vertically arranged. And during the manufacturing process, the weld between the outer box transverse diaphragm in the non-node area and the box girder web plate (2) is a full penetration weld, and the weld between the outer box transverse diaphragm in the non-node area and the top plate (3) is a double-sided fillet weld; Add 2mm to each side of the groove on the outer box transverse diaphragm; 6): After the lateral diaphragm (13) of the box body is positioned qualified, lift the bottom plate (1) unit onto the jig for assembly and positioning. When positioning, align the node center line, the position line of the port tongue-and-groove, and the perpendicularity. The specific welding method is as follows: Add a 1‰ welding shrinkage in the length direction of the bottom plate (1), and make the node plate correct. Add a 10 mm allowance at the other end; The weld between the bottom plate (1) and the box girder wall plate (2) is a full penetration weld. The node area uses a single-sided 40° root gap of 2 mm groove form. When the plate thickness > 40 mm, use a single-sided 30° root gap of 2 mm groove form; The weld between the bottom plate (1) and the external diaphragm (13) of the box body is a double-sided fillet weld, and a single-sided fillet weld form is required between the diaphragm at the port and the bottom plate (1). 7): Then weld and install the first support (5) and a group of second supports (6).

2. The manufacturing method of the box-shaped bridge chord rod according to claim 1, characterized in that: The specific manufacturing method of the first support (5) is as follows: 1): Weld the support top plate (51). Pre-manufacture the support top plate (51), and weld the U-shaped rib (511) and the first stiffening rib (512) on it. Both the U-shaped rib (511) and the first stiffening rib (512) are welded to the support top plate (51) by double-sided welds. The butt joint of the support top plate (51) uses an internal welding and external root clearing weld groove form. The first stiffening rib (512) and the small stiffening plate are both double-sided fillet welds with the framework; 2): The stiffening rib at the node on the box girder wall plate (2) and the box girder wall plate (2) are full penetration welds, using a double-sided 40° root gap of 2 mm groove form, and there is no R hole in the middle of this stiffening rib; 3): Weld and install the support node plate (52). First, pre-weld and install the middle support node plate (52), which is welded to the framework by a full penetration weld form, and uses a four-sided double-sided 40° root gap of 2 mm groove form; 4): Weld and install the internal diaphragm (55) of the support. The internal diaphragm (55) of the support and the framework are both full penetration welds, and use a double-sided 40° root gap of 2 mm groove form with the support top plate (51); Use a single-sided 40° root gap of 2 mm groove form with the two side support wall plates (56), and the groove faces outward; 5): Weld and install the support bottom plate (54). The support bottom plate (54) and the main body node plate are full penetration welded, and use an internal welding and external root clearing groove form. The stiffening rib at the node on the box girder wall plate (2) and the support bottom plate (54) are double-sided fillet welds. The internal diaphragm (55) of the support and the support bottom plate (54) use a double-sided 40° root gap of 2 mm groove form; 6): Weld and install the remaining support node plates (52). The remaining support node plates (52) are welded and installed by the back-installation method, and are full penetration welds with the framework, using a four-sided single-sided 40° root gap of 2 mm groove form; 7): Weld and install the support wall plate (56). The support wall plate (56) and the framework are both welded by full penetration welds, and use a single-sided 30° root gap of 2 mm groove form, and the groove faces outward. The inside and outside of the internal diaphragm (55) of the support are strengthened by fillet welds; The notch on the support wall plate (56) is cut with a 4 mm enlargement, and the U-shaped rib and the long strip stiffening rib are double-sided fillet welds with the support wall plate (56); 8): Weld the long and small stiffening plates. The long and small stiffening plates on the outer side of the support wall plate (56) are welded to the support wall plate (56) in the form of full penetration welds. The double-sided 40° root opening of 2 mm is adopted. The small stiffening plate on the outer side is a full penetration weld, and the single-sided 40° root opening of 2 mm is adopted. The long stiffening plate on the inner side of the support wall plate (56) is a full penetration weld, and the single-sided 40° root opening of 2 mm is adopted, and the back installation method is used for installation.

3. The manufacturing method of the box girder chord according to claim 1, characterized in that: The specific manufacturing method of the chord end beam assembly (4) in the box-shaped bridge chord is as follows: 1): Weld the butt web (41). The range of 200 mm at the root of the stiffening plate of the butt web member needs to be welded with full penetration. The inner welding and outer root clearing groove form is adopted, and the rest positions are full penetration welds. When the plate thickness ≤ 20 mm, the single-sided 40° root opening of 2 mm is adopted; when the plate thickness > 20 mm, the double-sided 40° root opening of 2 mm is adopted. 2): Weld the closure plate (42). The closure plate (42) and the two gusset plates (22) are welded in the form of a single-sided 40° root opening of 2 mm. The weld between the lifting lug and the frame is full penetration welding, and the root clearing weld groove form is adopted.

4. The manufacturing method of the box girder chord according to claim 1, characterized in that: The specific manufacturing method of the second support (6) is as follows: 1): First, perform H-shaped closure on the second support (6), and the H-shaped closure is welded with double-sided fillet welds. 2): Weld the second support cover plate. The second support cover plate and the H-shaped closure are full penetration welds, and the single-sided 40° root opening of 2 mm is adopted for welding. 3): After the self-closure of the second support (6) is completed, the welds between the second support (6) and the frame are all full penetration welds, and the single-sided 40° root opening of 2 mm is adopted, and the groove faces outward. 4): The double-sided fillet welds are used between the small stiffening plate and the body and between the stiffening ribs in the second support (6).

5. The manufacturing method of the box girder chord according to claim 1, characterized in that: The box-shaped bridge chord includes: a bottom plate (1), a group of box girder wall plates (2), a top plate (3), a chord end beam assembly (4), a first support (5) and a group of second supports (6). The box girder wall plates (2) are arranged oppositely and are provided on the bottom plate (1). The top plate (3) is provided above the two box girder wall plates (2). The chord end beam assembly (4) is provided above the top plate (3). The first support (5) is provided below the bottom plate (1) and is arranged in the opposite direction to the chord end beam assembly (4). The second support (6) is provided on the top plate (3).

6. The manufacturing method of the box girder chord according to claim 5, characterized in that: The bottom plate (1) includes a bottom plate body (11). Lower bracket gusset plates (12) are symmetrically arranged on both sides of the bottom plate body (11). A group of lateral diaphragms outside the box body (13) are provided between the lower bracket gusset plates (12) and the outer edge plate of the top plate (3), and patch plates (14) are provided at both ends of the top plate (3).

7. The manufacturing method of the box-shaped bridge chord rod according to claim 5, characterized in that: The box girder web plate (2) includes a box girder web plate body (21). Above the box girder web plate body (21), there is a gusset plate (22) for installing the chord end beam assembly (4). The first bearing (5) is arranged on the outer side of the box girder web plate body (21). On the inner walls of the box girder web plate (2) and the top plate (3), there is a group of stiffening ribs (23). On the stiffening ribs (23), there is a stiffening plate (24). And between the two box girder web plates (2), there is a group of transverse stiffening partition plates (25), and the transverse stiffening partition plates (25) are simultaneously connected to the stiffening ribs (23) on the inner walls of the box girder web plate (2) and the top plate (3); On the side of the stiffening plate (24), there is a group of installation grooves for installing the stiffening ribs (23).

8. The manufacturing method of the box-shaped bridge chord according to claim 5, characterized in that: The chord end beam assembly (4) includes a group of butt webs (41) and a group of sealing plates (42). The butt webs (41) are arranged between the two gusset plates (22). The sealing plates (42) are arranged between the two gusset plates (22) and are connected to the butt webs (41), and the sealing plates (42) are in an arc shape.

9. The manufacturing method of the box-shaped bridge chord according to claim 5, characterized in that: The first bearing (5) includes a group of bearing top plates (51), a group of bearing gusset plates (52), a group of bearing inner partition plates (53), a bearing bottom plate (54) and a group of bearing inner transverse partition plates (55). The bearing top plates (51) are arranged on the outer side of the top plate (3). The bearing gusset plates (52) are oppositely arranged on the bottom plate (1). The bearing inner partition plates (53) are arranged between the bearing gusset plates (52). The bearing bottom plate (54) is arranged at the bottom of the bearing gusset plates (52). The bearing inner transverse partition plates (55) are vertically arranged between the bearing top plates (51) and the bearing bottom plate (54), and bearing wall plates (56) are arranged on both sides of the bearing inner transverse partition plates (55); On both the inner and outer sides of the bearing wall plate (56), there are long strip stiffening plates, and between the long strip stiffening plates on the outer side of the bearing wall plate (56), there are also small block stiffening plates; On the bearing top plate (51), there are U-shaped ribs (511) and a group of first stiffening ribs (512).

10. The manufacturing method of the box girder chord according to claim 8, characterized in that: On three sides of the stiffening plate (24), there are installation grooves, and the installation grooves are herringbone hole grooves.

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