Primary and secondary beam frame structure for a bridge with greatly variable width and assembly method thereof

Abstract

The present application discloses a main and secondary beam frame structure for a bridge with greatly variable width and an assembly method thereof, comprising: a main beam structure and a plurality of I-beam cross beams, a plurality of I-beam cantilever beams, and an anti-corrosion sealing component welded and arranged on the main beam structure; the main beam structure comprises: a plurality of sections of box-type main beams, the box-type main beams are connected end to end to form a triangle, and the box-type main beams are respectively arranged on the longitudinal and transverse central axes of the enclosed triangle. It is mainly composed of a box-type main beam, an I-beam cross beam, an I-beam cantilever beam, a small longitudinal beam of a channel steel, and an angle steel diagonal brace. The box-type main beam is divided into several sections according to the transportation and hoisting capacity, and is spliced ​​into an integral frame after on-site hoisting. After the box-type main beam is installed, the I-beam cross beam, the I-beam cantilever beam, the small longitudinal beam of a channel steel, and the angle steel diagonal brace are installed in sequence, and a bridge with a required width change can be obtained as required without increasing the box chamber width and the cantilever width. The structure has good overall economy, convenient transportation and construction, and reliable quality.

Description

Technical Field

[0001] The present application relates to the technical field of bridge engineering, and in particular to a primary and secondary beam frame structure for a bridge with greatly variable width and an assembly method thereof. Background Art

[0002] Bridges are divided into concrete bridges and steel bridges. Generally speaking, steel bridges have a stronger ability to adapt to widening. Bridges with a slightly larger widening range generally use steel box girders. Since widening is achieved by adjusting the number of box chambers, the width of the box chambers and the width of the cantilever, such as Figures 1-2 shown.

[0003] For example, for a 25m span steel box girder, when the bridge width needs to be widened from 6m to 18m, the prior art mainly adjusts the number of box chambers and / or increases the width of the box chambers by 6-7m, and adjusts the cantilever width by 5-6m to achieve the purpose of increasing the overall width by 12m. Figures 1-2 The method of increasing the width shown in is to increase the number of single-row boxes from both ends of the bridge to the center, and at the same time increase the width of each row of boxes, so as to achieve the purpose of widening.

[0004] This widening method results in a large amount of steel consumption and poor economic efficiency; it also has high requirements for transportation and hoisting. For example, in the prior art, CN202011188662.8 discloses a beam transport vehicle, a beam transport system, a steel box beam assembly system, and a steel box beam assembly method. The beam transport device can be used to transport steel box beams, but the device has a complex structure, high cost, and large investment.

[0005] The photos of the existing steel box girder construction site are as follows: Figure 2 As shown, there are still many problems when the existing steel box girders are used for bridges with large width variations: the workload of on-site assembly and welding is large after the steel box girders are hoisted in pieces and sections, and most of the welding work needs to be completed inside a closed box body. The operating space inside the box body is small, and welding is difficult; especially when the height of the steel box girder is only about 1m, the operators operate in this environment for a long time, it is difficult to ensure the quality of the entire welding process, the welding cycle is long, and the construction efficiency is low. Summary of the invention

[0006] The present application provides a primary and secondary beam frame structure for a bridge with a greatly variable width and an assembly method thereof, which are used to solve the technical problems existing in the prior art, such as large steel consumption and poor economy; high requirements for transportation and hoisting; large workload for on-site welding, small welding operation space, long welding cycle and difficulty in ensuring welding quality, great difficulty in on-site splicing and low construction efficiency.

[0007] The present application provides a main and secondary beam frame structure for a bridge with a large width change, comprising: a main beam structure and a plurality of I-beam cross beams connected to the main beam structure, a plurality of I-beam cantilever beams, and an anti-corrosion sealing assembly;

[0008] The main beam structure includes: multiple sections of box-type main beams, which are connected end to end to form a triangle, and the box-type main beams are respectively arranged on the longitudinal and transverse central axes of the enclosed triangle;

[0009] A plurality of I-beam cross beams are arranged in the main beam structure at intervals along the lateral direction of the main beam structure;

[0010] A plurality of I-beam cantilever beams are arranged on the outer sides of the two oblique sides of the main beam structure;

[0011] Small longitudinal channel beams and angle steel braces are installed between any two adjacent I-beams;

[0012] Angle steel diagonal braces are installed between any two adjacent I-beam cantilever beams;

[0013] The box-type main beam is welded and assembled by a plurality of box-type main beam steel plates, a plurality of box-type main beam stiffening ribs, a plurality of box-type main beam cross diaphragms, and a plurality of box-type main beam cross diaphragm stiffening ribs;

[0014] A plurality of box-type main beam steel plates are surrounded to form a rectangular box body; the box-type main beam stiffening ribs are arranged on the inner side walls of each box-type main beam steel plate; the box-type main beam cross diaphragms are arranged in intervals in the rectangular box body and are respectively connected to the inner side walls of the opposite box-type main beam steel plates; the box-type main beam cross diaphragm stiffening ribs are arranged on the inner side of the holes of each box-type main beam cross diaphragm; a manhole is provided on the box-type main beam cross diaphragm;

[0015] The anti-corrosion sealing components are respectively arranged on the end manholes of the box-type main beam and are detachably connected to the end manholes of the box-type main beam.

[0016] Preferably, the anti-corrosion sealing assembly comprises: a box-type main beam annular reinforcement steel plate, a box-type main beam sealing gasket, a box-type main beam sealing cover plate handle, a box-type main beam sealing cover plate bolt, and a box-type main beam sealing cover plate;

[0017] The annular reinforcing steel plate of the box-type main beam is welded and arranged on the outer wall of the manhole of the box-type main beam cross-partition at the end; a box-type main beam sealing gasket is arranged on the outer wall of the annular reinforcing steel plate of the box-type main beam; a box-type main beam sealing cover plate is arranged on the outer wall of the box-type main beam sealing gasket, and the box-type main beam sealing cover plate and the box-type main beam cross-partition are disassembled and connected.

[0018] Preferably, it includes: a plurality of box-type main beam stiffening ribs; box-type main beam stiffening ribs are arranged in the middle of each inner side wall of the box-type main beam steel plate along the transverse center axis of the box-type main beam; the box-type main beam stiffening ribs are inserted into the installation grooves opened on the periphery of the box-type main beam transverse partition, and are welded.

[0019] Preferably, box-type main beam sealing cover plates are respectively provided at both ends of the box-type main beam; the box-type main beam sealing cover plates are installed on the manhole of the box-type main beam transverse partition.

[0020] Preferably, the box-type main beam includes: a first main beam, a second main beam, a third main beam, a fourth main beam, and a fifth main beam; the first main beam is connected to the second main beam and the fifth main beam end to end and forms a triangle; the first end of the third main beam is connected to the midpoint of the second main beam; the second end of the third main beam is connected to the midpoint of the fifth main beam; the first end of the fourth main beam is connected to the midpoint of the first main beam; the second end of the fourth main beam is connected to the connecting point of the second main beam and the fifth main beam.

[0021] Preferably, two ends of the I-beam cross beam are respectively abutted against opposite side walls of the first main beam and the third main beam and are spaced apart.

[0022] Preferably, the I-beam cantilever beams are arranged at intervals on the outer side walls of the second main beam and the fifth main beam.

[0023] Preferably, the small longitudinal beam of the channel steel is parallel to the first main beam, and the two ends of the small longitudinal beam of the channel steel are respectively connected to the midpoints of any two adjacent I-beam cross beams.

[0024] Preferably, the first end of the angle steel diagonal brace is connected to the intersection of the first main beam and the I-beam cross beam; the second end of the angle steel diagonal brace is connected to the intersection of the third main beam and the I-beam cross beam.

[0025] Preferably, the angle steel diagonal braces are arranged at intervals.

[0026] Preferably, the angle steel brace is arranged on the outside of the third main beam; the first end of the angle steel brace is connected to the extended end of the I-beam cantilever beam; the first end of the angle steel brace is connected to the connection point of the I-beam cantilever beam and the second main beam.

[0027] Preferably, the angle steel brace is arranged on the outside of the third main beam; the first end of the angle steel brace is connected to the extended end of the I-beam cantilever beam; the first end of the angle steel brace is connected to the connection point of the I-beam cantilever beam and the fifth main beam.

[0028] Preferably, two ends of the I-beam crossbeam are respectively connected to opposite side walls of the third main beam and the second main beam.

[0029] Another aspect of the present application also provides a method for assembling the primary and secondary beam frame structure for a bridge with greatly variable width as described above, comprising the following steps:

[0030] Step S1: The box-type main beam segment is processed and manufactured in the factory. When processing and manufacturing the segment, it is necessary to weld the annular reinforcement steel plate on the diaphragm at the sealing cover plate position, and at the same time, the relevant components of the sealing device are pre-placed at the corresponding position of the segment;

[0031] Step S2: The box-type main beams are hoisted on site and assembled into an overall frame;

[0032] Step S3: sequentially installing an I-beam cross beam and an I-beam cantilever beam on the box-shaped main beam;

[0033] Step S4: installing channel steel small longitudinal beams and angle steel diagonal braces between I-beam crossbeams;

[0034] Step S5: installing angle steel braces between I-beam cantilever beams;

[0035] Step S6: installing an anti-corrosion sealing component on the manhole opened at the end of the box-type main beam, and disassembling and connecting the anti-corrosion sealing component to the end manhole of the box-type main beam.

[0036] The beneficial effects of this application include:

[0037] 1) The main and secondary beam frame structure for a bridge with a large width provided by the present application is mainly composed of a box-type main beam, an I-beam cross beam, an I-beam cantilever beam, a small longitudinal beam of a channel steel, and an angle steel diagonal brace. The box-type main beam is divided into several sections according to the transportation and hoisting capacity, and is assembled into an overall frame after on-site hoisting. After the box-type main beam is installed, the I-beam cross beam, the I-beam cantilever beam, the small longitudinal beam of a channel steel, and the angle steel diagonal brace are installed in sequence, and the required width of the bridge can be obtained as required without increasing the box room width and the cantilever width. The structure has good overall economic efficiency, convenient transportation and construction, and reliable quality.

[0038] 2) The primary and secondary beam frame structure for a bridge with a large width provided in the present application is a structure in which a box-type main beam is used as the main beam to form a triangle. Then, welding of components such as I-beam cross beams, I-beam cantilever beams, small longitudinal beams of channel steels, and angle steel braces is carried out within the area enclosed by the main beam. There is no welding inside a closed box chamber, and the welding operation space is large, which is convenient for operation. After welding, the weld grade and quality are tested to meet the requirements of the specifications, and the overall mechanical strength of the bridge meets the requirements of existing steel box beams. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of the main structure of a steel box girder in the prior art;

[0040] Figure 2 This is a photo of the construction status of the steel box girder in the prior art;

[0041] Figure 3 The overall plan view of the primary and secondary beam frame structure for a bridge with a large width change provided in this application;

[0042] Figure 4 A schematic plan view of the main beam frame structure provided for this application;

[0043] Figure 5 A schematic diagram of the main cross-sectional structure of the box-type main beam provided for this application;

[0044] Figure 6 This is a schematic diagram of the main structure of the sealing structure of the box-type main beam provided in this application;

[0045] Figure 7 A schematic diagram of the sealing structure elevation of the box-type main beam provided in this application;

[0046] Figure 8 The schematic diagram of the cross-sectional structure of the I-beam crossbeam, I-beam cantilever beam, and channel steel small longitudinal beam provided in this application, wherein a is an I-beam crossbeam or an I-beam cantilever beam; b is a channel steel small longitudinal beam;

[0047] Fig. 9 A schematic diagram of the cross-sectional structure of the box-type main beam provided for this application;

[0048] Fig.10 Provide on-site construction drawings in the embodiments for this application;

[0049] Legend:

[0050] 10. Box-type main beam; 11. I-beam cross beam; 12. I-beam cantilever beam; 13. Channel steel small longitudinal beam; 14. Angle steel diagonal brace; 30. Box-type main beam steel plate; 31. Box-type main beam stiffening rib; 32. Box-type main beam cross diaphragm; 33. Box-type main beam cross diaphragm stiffening rib; 34. Box-type main beam sealing cover plate; 50. Box-type main beam annular reinforcement steel plate; 51. Box-type main beam sealing gasket; 52. Box-type main beam sealing cover plate handle; 53. Box-type main beam sealing cover plate bolt; 111. First main beam; 112. Second main beam; 113. Third main beam; 114. Fourth main beam; 115. Fifth main beam. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0052] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] Technical features that are not used to solve the technical problems of the present application are all set or installed according to the commonly used methods in the prior art and will not be described here.

[0054] See also Figures 3 to 9The main and secondary beam frame structure for a substantially widened bridge provided in the present application comprises: a main beam structure and a plurality of I-beam cross beams 11 welded and arranged on the main beam structure, a plurality of I-beam cantilever beams 12, and an anti-corrosion sealing assembly;

[0055] The main beam structure includes: a plurality of box-type main beams 10, the box-type main beams 10 are connected end to end to form a triangle, and the box-type main beams 10 are respectively arranged on the longitudinal and transverse central axes of the enclosed triangle;

[0056] A plurality of I-beam cross beams 11 are arranged in the main beam structure at intervals along the lateral direction of the main beam structure;

[0057] A plurality of I-beam cantilever beams 12 are arranged outside the two oblique sides of the main beam structure;

[0058] A channel steel small longitudinal beam 13 and an angle steel diagonal brace 14 are installed between any two adjacent I-beam cross beams 11;

[0059] Angle steel braces 14 are installed between any two adjacent I-steel cantilever beams 12;

[0060] The box-type main beam 10 is welded and assembled by a plurality of box-type main beam steel plates 30, a plurality of box-type main beam stiffening ribs 31, a plurality of box-type main beam transverse diaphragms 32, and a plurality of box-type main beam transverse diaphragm stiffening ribs 33;

[0061] A plurality of box-type main beam steel plates 30 form a rectangular box body; box-type main beam stiffening ribs 31 are arranged on the inner side walls of each box-type main beam steel plate 30; box-type main beam cross diaphragms 32 are arranged in the rectangular box body at intervals and are respectively connected to the inner side walls of the opposite box-type main beam steel plates 30; box-type main beam cross diaphragm stiffening ribs 33 are arranged on the inner side of the holes of each box-type main beam cross diaphragm 32; a manhole is provided on the box-type main beam cross diaphragm 32;

[0062] The anti-corrosion sealing components are respectively arranged on the end manholes of the box-type main beam 10 and are detachably connected to the end manholes of the box-type main beam 10 .

[0063] The structure provided by the present application uses a box-type main beam structure as the main structure. The size of the main beam structure does not need to be changed. Only the internal angle of the main beam structure needs to be changed to meet the change in the width of the bridge. This facilitates the standardized processing and production of the box-type main beam. The box-type main beam is processed in the factory and transported to the site in sections for hoisting and then spliced ​​with bolts, which can effectively reduce the workload of on-site welding, reduce the difficulty of assembly and transportation, and reduce the difficulty of assembly and splicing. After the box-type main beam is spliced, the components connected to the box-type main beam are welded to it. The operator can stand normally in the area surrounded by the main beam structure to perform welding, which can effectively ensure the welding quality, thereby helping to improve the overall mechanical properties of the structure.

[0064] According to the bridge deck width as the flat side of the triangle surrounded by the box-type main beam 10, after calculating the inner vertex angle of the triangle, the angle between the second main beam 112 and the fifth main beam 115 is adjusted according to the inner vertex angle, and the length of the second main beam 112 and the fifth main beam 115 is adaptively adjusted, so as to achieve effective support for the widened bridge deck. The structure provided by the present application only needs to change the inner angle of the main beam structure and the length of the hypotenuse of the box-type main beam 10 to meet the change of the bridge width, and can be adjusted according to the width of the bridge deck.

[0065] Preferably, the anti-corrosion sealing assembly includes: a box-type main beam annular reinforcement steel plate 50, a box-type main beam sealing gasket 51, a box-type main beam sealing cover plate handle 52, a box-type main beam sealing cover plate bolt 53, and a box-type main beam sealing cover plate 34;

[0066] The box-type main beam annular reinforcement steel plate 50 is welded and arranged on the outer side wall of the manhole of the box-type main beam transverse partition 32 at the end; the box-type main beam sealing gasket 51 is arranged on the outer side wall of the box-type main beam annular reinforcement steel plate 50; the box-type main beam sealing cover plate 34 is arranged on the outer side wall of the box-type main beam sealing gasket 51, and the box-type main beam sealing cover plate 34 and the box-type main beam transverse partition 32 are detachably connected.

[0067] The setting of the sealing cover plate can isolate the interior of the box-type main beam from the outside air, which can effectively prevent the interior of the box-type main beam from being corroded and avoid maintenance and repair inside the narrow box room during later operations.

[0068] Preferably, it includes: a plurality of box-type main beam stiffening ribs 31; box-type main beam stiffening ribs 31 are arranged in the middle of each inner side wall of the box-type main beam steel plate 30 along the transverse center axis of the box-type main beam 10; the box-type main beam stiffening ribs 31 are inserted into the installation grooves opened on the periphery of the box-type main beam cross partition 32, and are welded.

[0069] According to this arrangement, the above-mentioned structure of the box-type main beam cross partition 32 and the box-type main beam stiffening rib 31 can be used to strengthen the overall force-bearing strength of the box-type main beam 10, and a main and secondary beam frame structure that meets the mechanical performance requirements is obtained without increasing its width.

[0070] In a specific embodiment, the I-beam cross beam 11 and the I-beam cantilever beam 12 are I-beam structures; preferably, the dimensions are 360 ​​mm in wing plate width, 16 mm in wing plate thickness, 1144 mm in web plate height, and 12 mm in web plate thickness; the channel steel small longitudinal beam 13 is a channel steel structure; preferably, the dimensions are No. 28 channel steel;

[0071] Preferably, box-type main beam sealing cover plates 34 are respectively provided at both ends of the box-type main beam 10 ; the box-type main beam sealing cover plates 34 are installed on the central installation hole of the box-type main beam transverse partition plate 32 .

[0072] Preferably, the box-type main beam 10 includes: a first main beam 111, a second main beam 112, a third main beam 113, a fourth main beam 114, and a fifth main beam 115; the first main beam 111 is connected to the second main beam 112 and the fifth main beam 115 end to end and forms a triangle; the first end of the third main beam 113 is connected to the midpoint of the second main beam 112; the second end of the third main beam 113 is connected to the midpoint of the fifth main beam 115; the first end of the fourth main beam 114 is connected to the midpoint of the first main beam 111; the second end of the fourth main beam 114 is connected to the connecting point of the second main beam 112 and the fifth main beam 115.

[0073] By adopting the above main beam connection method, the fourth main beam 114 and the third main beam 113 can be used to strengthen the overall strength of the enclosed triangular main beam, while providing reliable support for the triangle after the angle is enlarged.

[0074] Preferably, two ends of the I-beam cross beam 11 are respectively abutted against opposite side walls of the first main beam 111 and the third main beam 113 and are spaced apart.

[0075] Preferably, the I-beam cantilever beams 12 are arranged at intervals on the outer side walls of the second main beam 112 and the fifth main beam 115 .

[0076] Preferably, the small longitudinal channel beam 13 is parallel to the first main beam 111 , and two ends of the small longitudinal channel beam 13 are respectively connected to the midpoints of any two adjacent I-beam cross beams 11 .

[0077] Preferably, the first end of the angle steel brace 14 is connected to the intersection of the first main beam 111 and the I-beam cross beam 11; the second end of the angle steel brace 14 is connected to the intersection of the third main beam 113 and the I-beam cross beam 11. This arrangement can enhance the overall stability of the frame structure.

[0078] Preferably, the angle steel braces 14 are arranged at intervals. According to this arrangement, the first end of an angle steel brace 14 is arranged at an interval.

[0079] In a specific embodiment, the angle steel brace 14 includes: a first I-beam and a second I-beam cross-connected at a midpoint; two ends of the first I-beam and the second I-beam are respectively the first end and the second end of the angle steel brace 14 .

[0080] Preferably, the angle steel brace 14 is arranged outside the third main beam 113; the first end of the angle steel brace 14 is connected to the extended end of the I-beam cantilever beam 12; the first end of the angle steel brace 14 is connected to the connection point of the I-beam cantilever beam 12 and the second main beam 112. This arrangement can improve the overall stability of the second main beam 112 and the cantilever beam 12.

[0081] Preferably, the angle steel brace 14 is arranged outside the third main beam 113; the first end of the angle steel brace 14 is connected to the extended end of the I-beam cantilever beam 12; the first end of the angle steel brace 14 is connected to the connection point of the I-beam cantilever beam 12 and the fifth main beam 115. This arrangement can improve the overall stability of the fifth main beam 115 and the cantilever beam 12.

[0082] Preferably, both ends of the I-beam cross beam 11 are connected to opposite side walls of the third main beam 113 and the second main beam 112 respectively.

[0083] Preferably, both ends of the I-beam cross beam 11 are connected to opposite side walls of the third main beam 113 and the fifth main beam 115 respectively.

[0084] According to this arrangement, the connection strength between the third main beam 113 and the second main beam 112 as well as the third main beam 113 and the fifth main beam 115 can be enhanced.

[0085] In a specific embodiment, the I-beam cross beam 11 can be replaced by channel steel, square steel pipe, etc.; the channel steel small longitudinal beam 13 can be replaced by an I-beam or an angle steel; the angle steel diagonal brace 14 can be replaced by an I-beam or a channel steel; the box-type main beam 10 can be spliced ​​into a frame of any shape as needed;

[0086] The above-mentioned greatly variable width bridge provides a main and secondary beam frame structure with good economy, convenient transportation and construction, and reliable quality, which solves many problems existing when traditional steel box girders are used for bridges with greatly variable width.

[0087] Another aspect of the present application also provides an assembly method of the above structure, comprising the following steps:

[0088] Step S1: The box-type main beam 10 segments are processed and manufactured in the factory. When processing and manufacturing the segments, attention should be paid to welding the annular reinforcing steel plate on the transverse partition at the sealing cover plate position, and at the same time, the relevant components of the sealing device should be pre-placed in the corresponding position of the segment.

[0089] Step S2: The box-type main beam 10 is hoisted on site and assembled into an integral frame;

[0090] Step S3: sequentially installing the I-beam cross beam 11 and the I-beam cantilever beam 12 on the box-shaped main beam 10;

[0091] Step S4: installing the channel steel longitudinal beam 13 and the angle steel brace 14 between the I-beam cross beams 11;

[0092] Step S5: installing angle steel braces 14 between the I-beam cantilever beams 12;

[0093] Step S6: an anti-corrosion sealing assembly is installed on the manhole opened at the end of the box-type main beam 10 , and the anti-corrosion sealing assembly is detachably connected to the end manhole of the box-type main beam 10 .

[0094] Preferably, an anti-corrosion sealing device is provided, a sealing gasket is provided on the annular reinforcing steel plate, and a sealing cover plate is provided on the sealing gasket; the sealing cover plate and the transverse partition are connected by sealing cover plate bolts, and a cover plate handle is provided on the sealing cover plate.

[0095] Example

[0096] The components used in the following examples are all commercially available products.

[0097] Example 1

[0098] I-beam cross beams 11 and I-beam cantilever beams 12 are sequentially installed on the box-type main beam 10, channel steel small longitudinal beams 13 and angle steel diagonal braces 14 are installed between the I-beam cross beams 11, and angle steel diagonal braces 14 are installed between the I-beam cantilever beams 12. The box-type main beam 10 is welded and assembled by box-type main beam steel plates 30, box-type main beam stiffening ribs 3131, box-type main beam transverse diaphragms 32, and box-type main beam transverse diaphragm stiffening ribs 33; an anti-corrosion sealing device is arranged at the end of the box-type main beam 10, an annular reinforcing steel plate 50 is welded on the transverse diaphragm 32, a sealing gasket 51 is arranged on the annular reinforcing steel plate 50, a sealing cover plate 34 is arranged on the sealing gasket 51, the sealing cover plate 34 and the transverse diaphragm 32 are connected by sealing cover plate bolts 53, and a cover plate handle 52 is arranged on the sealing cover plate 34.

[0099] The structural assembly method comprises the following steps:

[0100] Step S1: The box-type main beam 10 segments are processed and manufactured in the factory. When processing and manufacturing the segments, attention should be paid to welding the annular reinforcing steel plate on the transverse partition at the sealing cover plate position, and at the same time, the relevant components of the sealing device should be pre-placed in the corresponding position of the segment.

[0101] Step S2: The box-type main beam 10 is hoisted on site and assembled into an integral frame;

[0102] Step S3: sequentially installing the I-beam cross beam 11 and the I-beam cantilever beam 12 on the box-shaped main beam 10;

[0103] Step S4: installing the channel steel small longitudinal beam 13 and the angle steel diagonal brace 14 between the I-beam cross beam 11;

[0104] Step S5: installing angle steel braces 14 between the I-beam cantilever beams 12;

[0105] Step S6: an anti-corrosion sealing device is provided at the end of the box-type main beam 10, a sealing gasket is provided on the annular reinforcing steel plate, and a sealing cover plate is provided on the sealing gasket; the sealing cover plate and the transverse partition are connected by sealing cover plate bolts, and a cover plate handle is provided on the sealing cover plate.

[0106] The bridge construction site photos in this embodiment are as follows Fig.10 shown.

[0107] After calculation, the resulting structure meets the bearing strength requirements during normal operation, and the crowd load during normal operation can reach 4.5kN / m 2 It can completely replace the existing steel box girder structure for normal use. The structure has been completed and is waiting to be delivered for operation.

[0108] The method and structure provided in this application are applied to a project in Hengqin New Area. The project has completed the ultrasonic testing of the welds of the structure in September 2020. The test report number is MGCS2020-0739. The test conclusion is: according to the GB / T 11345-2013 "Ultrasonic Testing Technology, Testing Level and Evaluation of Welds", the acceptance criteria are met. No unacceptable defects were found in the remaining welds. It complies with the requirements of JTG / TF50-2011 "Technical Specifications for Highway Bridge and Culvert Construction" and the design, and the quality is qualified.

[0109] From the above, it can be seen that the structure and method provided by this application can meet the project acceptance requirements and have qualified quality. At the same time, the load strength is the same as the steel box girder structure of the existing structure, which means that the structure provided by this application can completely replace the existing steel box girder for normal use.

[0110] Comparative Example

[0111] According to calculations, the existing steel box girder structure meets the load-bearing strength requirements during normal operation, and the crowd load during normal operation can reach 4.5kN / m 2 However, the existing steel box girders are prone to weld fatigue during operation, which affects the durability of the structure.

[0112] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A primary and secondary beam frame structure for a bridge with greatly variable width, characterized in that: include: A main beam structure, a plurality of I-beam cross beams (11) connected to the main beam structure, a plurality of I-beam cantilever beams (12), and an anti-corrosion sealing component; The main beam structure comprises: a plurality of box-type main beams (10), the box-type main beams (10) are connected end to end to form a triangle, and the box-type main beams (10) are respectively arranged on the longitudinal and transverse central axes of the enclosed triangle; A plurality of I-shaped steel beams (11) are arranged in the main beam structure at intervals along the transverse direction of the main beam structure; A plurality of I-beam cantilever beams (12) are arranged outside two oblique sides of the main beam structure; A channel steel small longitudinal beam (13) and an angle steel diagonal brace (14) are installed between any two adjacent I-beam cross beams (11); An angle steel brace (14) is installed between any two adjacent I-steel cantilever beams (12); The box-type main beam (10) is assembled by welding a plurality of box-type main beam steel plates (30), a plurality of box-type main beam stiffening ribs (31), a plurality of box-type main beam cross diaphragms (32), and a plurality of box-type main beam cross diaphragm stiffening ribs (33); A plurality of box-type main beam steel plates (30) form a rectangular box body; box-type main beam stiffening ribs (31) are arranged on the inner side walls of each box-type main beam steel plate (30); box-type main beam cross diaphragms (32) are arranged in intervals in the rectangular box body and are respectively connected to the inner side walls of the opposite box-type main beam steel plates (30); box-type main beam cross diaphragm stiffening ribs (33) are arranged on the inner side of the holes of each box-type main beam cross diaphragm (32); and a manhole is provided on the box-type main beam cross diaphragm (32); The anti-corrosion sealing components are respectively arranged on the end manholes of the box-type main beam (10) and are detachably connected to the end manholes of the box-type main beam (10).

2. The primary and secondary beam frame structure for a bridge with greatly variable width according to claim 1 is characterized in that: The anti-corrosion sealing assembly comprises: a box-type main beam annular reinforcement steel plate (50), a box-type main beam sealing gasket (51), a box-type main beam sealing cover plate handle (52), a box-type main beam sealing cover plate bolt (53), and a box-type main beam sealing cover plate (34); The box-type main beam annular reinforcement steel plate (50) is welded and arranged on the outer side wall of the manhole of the box-type main beam transverse diaphragm (32) at the end; the box-type main beam sealing gasket (51) is arranged on the outer side wall of the box-type main beam annular reinforcement steel plate (50); the box-type main beam sealing cover plate (34) is arranged on the outer side wall of the box-type main beam sealing gasket (51), and the box-type main beam sealing cover plate (34) and the box-type main beam transverse diaphragm (32) are detachably connected.

3. The primary and secondary beam frame structure for a bridge with greatly variable width according to claim 1 is characterized in that: include: A plurality of box-type main beam stiffening ribs (31); box-type main beam stiffening ribs (31) are arranged at the middle of each inner side wall of the box-type main beam steel plate (30) along the transverse central axis of the box-type main beam (10); the box-type main beam stiffening ribs (31) are inserted into the installation grooves provided on the periphery of the box-type main beam transverse partition (32), and are welded.

4. The primary and secondary beam frame structure for a bridge with greatly variable width according to claim 1 is characterized in that: Box-type main beam sealing cover plates (34) are respectively arranged at both ends of the box-type main beam (10); the box-type main beam sealing cover plates (34) are installed on the manhole of the box-type main beam transverse partition plate (32).

5. The primary and secondary beam frame structure for a bridge with greatly variable width according to claim 1 is characterized in that: The box-type main beam (10) comprises: a first main beam (111), a second main beam (112), a third main beam (113), a fourth main beam (114), and a fifth main beam (115); the first main beam (111) is connected to the second main beam (112) and the fifth main beam (115) at their ends to form a triangle; the first end of the third main beam (113) is connected to the midpoint of the second main beam (112); the second end of the third main beam (113) is connected to the midpoint of the fifth main beam (115); the first end of the fourth main beam (114) is connected to the midpoint of the first main beam (111); and the second end of the fourth main beam (114) is connected to the connecting point of the second main beam (112) and the fifth main beam (115).

6. The primary and secondary beam frame structure for a bridge with greatly variable width according to claim 1 is characterized in that: The two ends of the I-beam cross beam (11) are respectively abutted against the opposite side walls of the first main beam (111) and the third main beam (113) and are arranged at intervals.

7. The primary and secondary beam frame structure for a bridge with greatly variable width according to claim 1 is characterized in that: The I-beam cantilever beams (12) are arranged at intervals on the outer side walls of the second main beam (112) and the fifth main beam (115).

8. The primary and secondary beam frame structure for a bridge with greatly variable width according to claim 1 is characterized in that: The small longitudinal channel steel beam (13) is parallel to the first main beam (111), and two ends of the small longitudinal channel steel beam (13) are respectively connected to the midpoints of any two adjacent I-shaped steel beams (11).

9. The primary and secondary beam frame structure for a bridge with greatly variable width according to claim 1, characterized in that: The first end of the angle steel brace (14) is connected to the intersection of the first main beam (111) and the I-beam cross beam (11); the second end of the angle steel brace (14) is connected to the intersection of the third main beam (113) and the I-beam cross beam (11).

10. The primary and secondary beam frame structure for a bridge with greatly variable width according to claim 1, characterized in that: The angle steel diagonal braces (14) are arranged at intervals.

11. The primary and secondary beam frame structure for a bridge with greatly variable width according to claim 1, characterized in that: The angle steel brace (14) is arranged outside the third main beam (113); the first end of the angle steel brace (14) is connected to the extended end of the I-beam cantilever beam (12); the first end of the angle steel brace (14) is connected to the connection point of the I-beam cantilever beam (12) and the second main beam (112).

12. The primary and secondary beam frame structure for a bridge with greatly variable width according to claim 1, characterized in that: The angle steel brace (14) is arranged outside the third main beam (113); the first end of the angle steel brace (14) is connected to the extended end of the I-beam cantilever beam (12); the first end of the angle steel brace (14) is connected to the connection point of the I-beam cantilever beam (12) and the fifth main beam (115).

13. The primary and secondary beam frame structure for a bridge with greatly variable width according to claim 1, characterized in that: The two ends of the I-beam cross beam (11) are respectively connected to the opposite side walls of the third main beam (113) and the second main beam (112).

14. An assembly method for a primary and secondary beam frame structure for a bridge with a large width as claimed in any one of claims 1 to 13, characterized in that: The following steps are involved: Step S1: The box-type main beam (10) segment is processed and manufactured in the factory. When processing and manufacturing the segment, it is important to weld the annular reinforcing steel plate (50) on the box-type main beam diaphragm at the location of the anti-corrosion sealing component, and at the same time, the anti-corrosion sealing component related components are pre-placed at the corresponding position of the segment; Step S2: The box-type main beam (10) is hoisted on site and assembled into an integral frame; Step S3: sequentially installing an I-beam cross beam (11) and an I-beam cantilever beam (12) on the box-shaped main beam (10); Step S4: installing a channel steel longitudinal beam (13) and an angle steel brace (14) between the I-beam cross beam (11); Step S5: installing angle steel braces (14) between the I-beam cantilever beams (12); Step S6: installing an anti-corrosion sealing component on the manhole opened at the end of the box-type main beam (10), and the anti-corrosion sealing component is disassembled and connected to the end manhole of the box-type main beam (10).

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