A high-strength steel box girder structure for a steel structure and a construction method thereof

Abstract

The application provides a high-strength steel box girder structure for steel structure and a construction method thereof, and relates to the technical field of bridge construction. The high-strength steel box girder structure for steel structure comprises a locking mechanism and a longitudinal and transverse steel frame mechanism, the bottom end of the locking mechanism is provided with the longitudinal and transverse steel frame mechanism, the left and right sides of the longitudinal and transverse steel frame mechanism are provided with steel frame stabilizing mechanisms, the bottom end of the steel frame stabilizing mechanism is provided with a side steel frame mechanism, the longitudinal and transverse steel frame mechanism comprises a bottom plate and four longitudinal connecting plates, and the top end of the bottom plate is fixedly connected with five transverse connecting plates. The longitudinal connecting plates and the transverse connecting plates are arranged in the steel box girder, cross-welding is performed, the reinforcing effect of the steel frame stabilizing mechanism and the locking mechanism is utilized to enhance the overall strength of the steel box girder, the side steel frame mechanism is utilized to reinforce the two sides of the bottom plate of the steel box girder, the occurrence of the wrinkle damage phenomenon is reduced, the stress fatigue is reduced, and the smooth traffic is ensured.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, specifically to a high-strength steel box girder structure and its construction method. Background Technology

[0002] Steel box girders, also known as steel plate box girders, are named for their box-like shape. The steel box girder structure consists of a series of components, including a top plate, bottom plate, web plate, longitudinal stiffeners, transverse stiffeners, and vertical stiffeners. These components are connected by welding. The assembled steel box girder bridge deck has significant advantages such as light weight, large span capacity, and simple construction. It is especially suitable for long-span bridges and is currently widely used in bridge construction both domestically and internationally.

[0003] Existing steel box girder structures for roads and bridges are generally composed of a top plate, bottom plate, web plate, transverse diaphragms, longitudinal diaphragms, and stiffening ribs, all connected by full welding. The steel box girder is fixed and supported by the transverse and longitudinal diaphragms. However, this support method and fixing structure are relatively simple, which will affect the overall strength of the steel box girder and make it prone to the phenomenon of web wrinkling failure, thus affecting traffic flow. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a high-strength steel box girder structure for steel structures and its construction method. This solves the problems of existing steel box girder structures for roads and bridges relying solely on transverse and longitudinal diaphragms for overall fixation and support, as well as the wrinkling and damage caused by the inclined web, which disrupts traffic flow.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution: a high-strength steel box girder structure for steel structures, including a locking mechanism and a longitudinal and transverse steel frame mechanism, wherein the bottom end of the locking mechanism is provided with the longitudinal and transverse steel frame mechanism, the left and right sides of the longitudinal and transverse steel frame mechanism are provided with steel frame stabilizing mechanisms, and the bottom end of the steel frame stabilizing mechanism is provided with a side steel frame mechanism.

[0006] The longitudinal and transverse steel frame mechanism includes a base plate and four longitudinal connecting plates. Five transverse connecting plates are fixedly connected to the top and front and rear parts of the top of the base plate. Four first slots are equidistantly arranged at the top of the transverse connecting plates, and second slots are equidistantly arranged at the bottom and front and rear parts of the bottom. Four through holes are provided in the middle of the longitudinal connecting plates.

[0007] The steel frame stabilizing mechanism includes two side plates. A fixed steel frame is fixedly connected to the bottom center of the side plates. Four fixing holes are equidistantly arranged in the center of the fixed steel frame. Locking steel columns are respectively arranged in the center of the front and rear sides of the fixed steel frame. Single U-shaped grooves are respectively arranged on the left and right sides of the top of the locking steel columns. Double U-shaped grooves are arranged on the inner side of each single U-shaped groove.

[0008] The side steel frame mechanism includes two extension plates, each with a vertical plate fixedly connected to its outer top. The top of each vertical plate has four third slots equidistantly arranged at the front and rear. The inner side of each vertical plate is fixedly connected to five trapezoidal connecting plates.

[0009] Preferably, the locking mechanism includes a top plate, and a plurality of bolts are equidistantly arranged on the left and right sides of the bottom end of the top plate. A single locking plate is arranged on the inner side of each bolt, and a double locking plate is arranged on the inner side of each single locking plate.

[0010] Preferably, the top end of the side plate is provided with a number of holes at equal intervals, and the size of the holes is the same as that of the studs.

[0011] Preferably, the bottom end of the trapezoidal connecting plate is fixedly connected to the top end of the extension plate, and the inner side of the extension plate is fixedly connected to the lower left and right sides of the base plate respectively.

[0012] Preferably, the dimensions of the through hole and the outer hole are consistent with those of the locking steel column and the steel beam column.

[0013] Preferably, the base plate has four fixing holes equidistantly arranged on both the left and right sides, and steel beams are installed in the two fixing holes in the middle.

[0014] Preferably, L-shaped connectors are provided on the left and right sides and front and rear parts of the steel beams and columns and the locking steel columns.

[0015] A preferred method for constructing a high-strength steel box girder structure includes the following steps:

[0016] S1. The base plate frame is completed by welding, and four external holes are cut and drilled on the left and right sides respectively, thus completing the base plate. Five horizontal connecting plates are welded in the front and back directions inside, and four first slots are cut on the upper part to complete the initial construction. Then, the longitudinal connecting plates are made, and second slots with the same size as the first slots are set. The longitudinal connecting plates are inserted and fixed to the horizontal connecting plates in sequence to complete the construction of the longitudinal and transverse steel frame structure.

[0017] S2. After the frame is built, weld side plates on the left and right sides of the base plate, weld the fixed steel frame to the bottom of the side plates, take out the locking steel column, and insert the locking steel column into the through hole in the longitudinal connecting plate through the front and rear external holes and through holes in turn. Insert the steel column into the two external holes and through holes in the middle and fix it. Finally, fix both to the outside of the fixed steel frame with L-shaped connectors. Then the installation of the steel frame stabilization mechanism is completed.

[0018] S3. Install and weld extension plates on the lower left and right sides of the base plate. Weld vertical plates on the top of the extension plates. Cut four third slots on the upper part of the vertical plates. The width of the third slots is consistent with that of the locking steel columns and steel beams. Then, fix the third slots on the inside of the fixed steel frame and weld five trapezoidal connecting plates on the inside to complete the installation of the side steel frame mechanism.

[0019] S4. Cover the top of the base plate with the locking mechanism. The single and double locking plates at the bottom are locked in sequence at the connection of the longitudinal connecting plate and the transverse connecting plate. The locking is completed by the single U-shaped groove and double U-shaped groove set on the locking steel column. The fixing is completed by the left and right side studs embedded in the holes on the top plate. This completes the construction and installation process of a single steel box girder.

[0020] S5. By combining and installing multiple individual steel box girders, connecting them end to end, and cooperating with ground support devices, the entire road and bridge steel box girder laying is completed.

[0021] This invention provides a high-strength steel box girder structure for steel structures and its construction method. It has the following beneficial effects:

[0022] 1. This invention involves setting longitudinal and transverse connecting plates inside a steel box girder, and using first and second slots on these plates for interlocking, overlapping, and cross-welding. Simultaneously, side plates welded to the left and right sides of the base plate are used, with a fixed steel frame welded to the bottom of the side plates. Locking steel columns are sequentially inserted through the front and rear external holes and through holes into the through holes in the longitudinal connecting plates for fixation, while the two middle external holes and through holes are inserted into the steel beam columns for fixation. Both are finally fixed to the outside of the fixed steel frame using L-shaped connectors. The entire process completes the installation of the longitudinal and transverse steel frame mechanism and the steel frame stabilization mechanism. Combined with the locking mechanism, the longitudinal and transverse connecting plates are locked together, increasing the support methods and fixing structure of the steel box girder, and enhancing the overall strength of the steel box girder.

[0023] 2. This invention installs and welds extension plates on the lower left and right sides of the base plate, welds vertical plates on the top of the extension plates, cuts four third slots on the upper part of the vertical plates, and then fixes the third slots to the inside of the fixed steel frame. Five trapezoidal connecting plates are welded to the inside to complete the installation of the side steel frame mechanism, stabilize the two sides of the steel box girder base plate, prevent it from wrinkling and damaging, reduce its pressure fatigue, and ensure smooth traffic. Attached Figure Description

[0024] Figure 1 This is a front view of the present invention;

[0025] Figure 2 This is a schematic diagram of the top plate split structure of the present invention;

[0026] Figure 3 This is a schematic diagram of the longitudinal and transverse steel frame structure of the present invention;

[0027] Figure 4 This is a schematic diagram of the transverse connecting plate structure of the present invention;

[0028] Figure 5 This is a schematic diagram of the longitudinal connecting plate structure of the present invention;

[0029] Figure 6 This is a schematic diagram of the locking steel column structure of the present invention;

[0030] Figure 7 This is a schematic diagram of the side steel frame mechanism of the present invention;

[0031] Figure 8 This is a schematic diagram of the locking mechanism structure of the present invention;

[0032] Figure 9 This is a bottom view of the present invention.

[0033] The components include: 1. Locking mechanism; 2. Longitudinal and transverse steel frame mechanism; 3. Steel frame stabilizing mechanism; 4. Side steel frame mechanism; 101. Top plate; 102. Single locking plate; 103. Double locking plate; 104. Stud; 201. Bottom plate; 202. Longitudinal connecting plate; 203. Transverse connecting plate; 204. First locking slot; 205. Second locking slot; 206. Through hole; 207. External hole; 301. Side plate; 302. Fixed steel frame; 303. Fixed hole; 304. Locking steel column; 305. Single U-shaped groove; 306. Double U-shaped groove; 307. Hole position; 401. Extension plate; 402. Vertical plate; 403. Trapezoidal connecting plate; 404. Third locking slot; 5. Steel beam column; 6. L-shaped connector. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Example:

[0036] like Figure 1-9 As shown, this embodiment of the invention provides a high-strength steel box girder structure for steel structures, including a locking mechanism 1 and a longitudinal and transverse steel frame mechanism 2. The longitudinal and transverse steel frame mechanism 2 is provided at the bottom end of the locking mechanism 1, and steel frame stabilizing mechanisms 3 are provided on the left and right sides of the longitudinal and transverse steel frame mechanism 2. The side steel frame mechanism 4 is provided at the bottom end of the steel frame stabilizing mechanism 3.

[0037] The longitudinal and transverse steel frame mechanism 2 includes a base plate 201 and four longitudinal connecting plates 202. Five transverse connecting plates 203 are fixedly connected to the top front and rear of the base plate 201. Four first slots 204 are equidistantly arranged at the top of the transverse connecting plates 203. Two slots 205 are equidistantly arranged at the bottom front and rear of the longitudinal connecting plates 202. Four through holes 206 are arranged in the middle of the longitudinal connecting plates 202. The longitudinal connecting plates 202 and the transverse connecting plates 203 are cross-welded to each other, which can enhance the overall strength of the steel box girder structure, reduce the bending deformation of the plates, and further improve the service effect and strength of the steel box girder.

[0038] The steel frame stabilization mechanism 3 includes two side plates 301. A fixed steel frame 302 is fixedly connected to the bottom center of the side plates 301. Four fixing holes 303 are equidistantly arranged in the middle of the fixed steel frame 302. Locking steel columns 304 are respectively arranged in the middle of the front and rear sides of the fixed steel frame 302. Single U-shaped grooves 305 are respectively arranged on the left and right sides of the top of the locking steel column 304. Double U-shaped grooves 306 are arranged on the inner side of each single U-shaped groove 305. The overall load-bearing capacity of the steel box girder is improved by passing the locking steel column 304 through the fixed steel frame 302 and the through holes 206.

[0039] The side steel frame mechanism 4 includes two extension plates 401. Vertical plates 402 are fixedly connected to the outer top of each extension plate 401. Four third slots 404 are equidistantly arranged at the front and rear top of each vertical plate 402. Five trapezoidal connecting plates 403 are fixedly connected to the inner side of each vertical plate 402. The side steel frame mechanism 4, through its connection with the base plate 201, provides limiting support for the locking steel column 304 via the third slots 404 in the vertical plate 402, effectively preventing the fixed steel frame 302 from wrinkling and being damaged. At the same time, when hoisting from both sides of the steel box girder, it can also prevent the steel box girder from experiencing localized stress or accidental bending during hoisting, and achieve overall hoisting of the steel box girder, improving the stability during hoisting.

[0040] The locking mechanism 1 includes a top plate 101. Several bolts 104 are equidistantly arranged on the left and right sides of the bottom end of the top plate 101. A single locking plate 102 is arranged on the inner side of each bolt 104, and a double locking plate 103 is arranged on the inner side of each single locking plate 102. Through the action of the single locking plate 102 and the double locking plate 103, the position where the longitudinal connecting plate 202 and the transverse connecting plate 203 intersect is more firmly protected and fixed, thereby improving the external protection.

[0041] The top of the side plate 301 has several holes 307 at equal intervals at the front and rear. The size of the holes 307 is the same as that of the studs 104.

[0042] The bottom of the trapezoidal connecting plate 403 is fixedly connected to the top of the extension plate 401, and the inner side of the extension plate 401 is fixedly connected to the lower left and right sides of the base plate 201.

[0043] The dimensions of the through hole 206 and the outer hole 207 are consistent with those of the locking steel column 304 and the steel beam column 5.

[0044] The base plate 201 has four fixing holes 303 evenly spaced on both the left and right sides. Steel beams 5 are installed in the two fixing holes 303 in the middle. L-shaped connectors 6 are installed on the left, right and front sides of the steel beams 5 and the locking steel columns 304.

[0045] This invention provides a construction method for a high-strength steel box girder structure, comprising the following steps:

[0046] S1. The base plate 201 frame is completed by welding, and four external holes 207 are cut and drilled on the left and right sides respectively, thus completing the base plate 201. Five transverse connecting plates 203 are welded in the front and back directions inside, and four first slots 204 are cut on the upper part to complete the initial construction. Then, the longitudinal connecting plate 202 is made, and a second slot 205 with the same size as the first slot 204 is set. The longitudinal connecting plate 202 is inserted and fixed to the transverse connecting plate 203 in sequence to complete the construction of the longitudinal and transverse steel frame mechanism 2 frame. The longitudinal connecting plate 202 and the transverse connecting plate 203 are cross-welded to each other to enhance the overall strength of the steel box girder structure.

[0047] S2. After the frame is built, side plates 301 are welded to the left and right sides of the base plate 201. The fixed steel frame 302 is welded to the bottom of the side plates 301. The locking steel column 304 is taken out and inserted into the through hole 206 in the longitudinal connecting plate 202 through the front and rear outer holes 207 and through holes 206 in sequence. The two outer holes 207 and through holes 206 in the middle are inserted into the steel beam column 5 for fixation. Finally, both are fixed to the outside of the fixed steel frame 302 using L-shaped connectors 6. The installation of the steel frame stabilization mechanism 3 is then completed.

[0048] S3. Install and weld extension plates 401 on the lower left and right sides of the base plate 201. Weld vertical plates 402 to the top of the extension plates 401. Cut four third slots 404 on the upper part of the vertical plates 402. The width of the third slots 404 is consistent with that of the locking steel column 304 and the steel beam column 5. Then, fix the third slots 404 to the inside of the fixed steel frame 302 and weld five trapezoidal connecting plates 403 on the inside to complete the installation of the side steel frame mechanism 4.

[0049] S4. Cover the top of the base plate 201 with the locking mechanism 1. The single locking plate 102 and double locking plate 103 at the bottom end are locked in sequence at the connection of the longitudinal connecting plate 202 and the transverse connecting plate 203. The locking is completed by the single U-shaped groove 305 and double U-shaped groove 306 set on the locking steel column 304. The fixing is completed by the left and right side studs 104 on the top plate 101 being embedded in the holes 307. Thus, the construction and installation process of a single steel box girder is completed.

[0050] S5. By combining and installing multiple individual steel box girders, connecting them end to end, and cooperating with ground support devices, the entire road and bridge steel box girder laying is completed.

[0051] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-strength steel box girder structure for steel structures, comprising a locking mechanism (1) and a longitudinal and transverse steel frame mechanism (2), characterized in that: The bottom end of the locking mechanism (1) is provided with a longitudinal and transverse steel frame mechanism (2), the left and right sides of the longitudinal and transverse steel frame mechanism (2) are provided with steel frame stabilizing mechanisms (3), and the bottom end of the steel frame stabilizing mechanism (3) is provided with a side steel frame mechanism (4). The longitudinal and transverse steel frame mechanism (2) includes a base plate (201) and four longitudinal connecting plates (202). Five transverse connecting plates (203) are fixedly connected to the front and rear of the top of the base plate (201). Four first slots (204) are equidistantly arranged at the top of the transverse connecting plates (203). Two second slots (205) are equidistantly arranged at the front and rear of the bottom of the longitudinal connecting plates (202). Four through holes (206) are provided in the middle of the longitudinal connecting plates (202). The steel frame stabilizing mechanism (3) includes two side plates (301). A fixed steel frame (302) is fixedly connected to the middle of the bottom end of the side plate (301). Four fixing holes (303) are equidistantly arranged in the middle of the fixed steel frame (302). Locking steel columns (304) are respectively arranged in the middle of the front and rear sides of the fixed steel frame (302). Single U-shaped grooves (305) are respectively arranged on the left and right sides of the top of the locking steel column (304). Double U-shaped grooves (306) are arranged on the inner side of each single U-shaped groove (305). The side steel frame mechanism (4) includes two extension plates (401). The top outer side of each extension plate (401) is fixedly connected to a vertical plate (402). The top front and rear of each vertical plate (402) are provided with four third slots (404) at equal intervals. The inner side of each vertical plate (402) is fixedly connected to five trapezoidal connecting plates (403).

2. The high-strength steel box girder structure for steel structures according to claim 1, characterized in that: The locking mechanism (1) includes a top plate (101), and a number of studs (104) are equidistantly arranged on the left and right sides of the bottom end of the top plate (101). A single locking plate (102) is arranged on the inner side of each stud (104), and a double locking plate (103) is arranged on the inner side of each single locking plate (102).

3. A high-strength steel box girder structure for steel structures according to claim 1, characterized in that: The top end of the side plate (301) is provided with a number of holes (307) at equal intervals at the front and rear, and the size of the holes (307) is the same as that of the studs (104).

4. A high-strength steel box girder structure for steel structures according to claim 1, characterized in that: The bottom end of the trapezoidal connecting plate (403) is fixedly connected to the top end of the extension plate (401), and the inner side of the extension plate (401) is fixedly connected to the lower left and right sides of the base plate (201).

5. A high-strength steel box girder structure for steel structures according to claim 1, characterized in that: The dimensions of the through hole (206) and the outer hole (207) are consistent with those of the locking steel column (304) and the steel beam column (5).

6. A high-strength steel box girder structure for steel structures according to claim 1, characterized in that: The base plate (201) has four fixing holes (303) equidistantly arranged on the left and right sides, and steel beams (5) are installed in the two fixing holes (303) in the middle.

7. A high-strength steel box girder structure for steel structures according to claim 6, characterized in that: L-shaped connectors (6) are provided on the left and right sides and front and rear sides of the steel beam column (5) and the locking steel column (304).

8. The construction method for a high-strength steel box girder structure according to claim 1, characterized in that: Includes the following steps: S1. The base plate (201) frame is completed by welding, and four external holes (207) are cut and drilled on the left and right sides respectively, that is, the base plate (201) is completed. Five transverse connecting plates (203) are welded in the front and back directions inside, and four first slots (204) are cut on the upper part to complete the initial construction. Then, the longitudinal connecting plate (202) is made, and a second slot (205) with the same size as the first slot (204) is set. The longitudinal connecting plate (202) is inserted and fixed to the transverse connecting plate (203) in sequence to complete the construction of the longitudinal and transverse steel frame mechanism (2) frame. S2. After the frame is built, side plates (301) are welded on the left and right sides of the base plate (201). The fixed steel frame (302) is welded to the bottom of the side plate (301). Take out the locking steel column (304) and insert the locking steel column (304) into the through hole (206) in the longitudinal connecting plate (202) through the front and rear outer holes (207) and through holes (206) in sequence. The two outer holes (207) and through holes (206) in the middle are inserted into the steel column (5) for fixation. Finally, both are fixed to the outside of the fixed steel frame (302) using L-shaped connectors (6). Then the installation of the steel frame stabilization mechanism (3) is completed. S3. Install and weld extension plates (401) on the lower left and right sides of the base plate (201). Weld vertical plates (402) on the top of the extension plates (401). Cut four third slots (404) on the upper part of the vertical plates (402). The width of the third slots (404) is consistent with that of the locking steel column (304) and the steel beam column (5). Then, fix the third slots (404) on the inside of the fixed steel frame (302) and weld five trapezoidal connecting plates (403) on the inside to complete the installation of the side steel frame mechanism (4). S4. Cover the top of the base plate (201) with the locking mechanism (1). The single locking plate (102) and double locking plate (103) at the bottom end are locked in sequence at the connection of the longitudinal connecting plate (202) and the transverse connecting plate (203). The locking is completed by the single U-shaped groove (305) and double U-shaped groove (306) set on the locking steel column (304). The fixing is completed by the left and right side studs (104) on the top plate (101) being embedded in the holes (307). Thus, the construction and installation process of a single steel box girder is completed. S5. By combining and installing multiple individual steel box girders, connecting them end to end, and cooperating with ground support devices, the entire road and bridge steel box girder laying is completed.

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