A steel box girder segment assembly connection structure and construction method thereof

Abstract

The present invention relates to a steel box girder segment assembly connection structure and a construction method thereof, wherein the steel box girder segment assembly connection structure comprises a steel box girder segment and an embedded corrugated plate; transverse stiffening ribs, longitudinal stiffening ribs vertically arranged through the transverse stiffening ribs, and longitudinal slots used in conjunction with the embedded corrugated plates are welded on the top and bottom plates of the steel box girder segment, and the embedded corrugated plates are installed in the longitudinal slots on adjacent steel box girder segments. The steel box girder segment assembly connection structure of the present invention realizes pre-assembly of the steel box girder segments before circumferential welding by inserting the embedded corrugated plates into the longitudinal slots of adjacent steel box girder segments. The connection structure can help the steel box girder segments to prevent relative displacement between the segments during further welding. After the steel box girder is hoisted, the assembly line is achieved, which facilitates circumferential welding construction between the beam segments; rapid pre-assembly of the segments without welding is realized, and the segments do not need to be dismantled after circumferential welding, and can be used as permanent stiffening ribs of the steel box girder.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge construction, and in particular relates to a steel box girder segment assembly connection structure and a construction method thereof. Background Art

[0002] Steel box girders offer advantages such as large spans, light weight, high load capacity, and rapid construction. They are widely used in steel bridges and steel-concrete composite bridges, particularly as the main girders of long-span cable-stayed and suspension bridges. The prefabrication and assembly of steel box girders involves prefabricating steel box girder segments in a factory, installing them on-site using specialized lifting equipment, and finally assembling them on-site by welding or bolting.

[0003] The cross-sectional design of steel box girders is complex, and the workload of segment assembly is large, which brings many difficulties to the high-quality, high-precision, and high-efficiency segment assembly at the construction site. Currently, temporary steel plates are generally welded at the joints to assist in positioning or limiting the plates or components that need to be spliced. These temporary steel plates have relatively weak shear resistance and must be cut off after the box girder is circumferentially welded, resulting in a complex splicing process, low construction accuracy, and a long construction period. At the same time, the cutting process is also prone to damage to the surface of the steel box girder. In addition, the workload of assembling steel box girders for long-span bridges is large, and the splicing errors caused by this low-precision splicing method will gradually be amplified. In particular, during the construction of steel box main girders for long-span suspension bridges, the traditional construction method requires that all steel box girder segments be hoisted into place before welding the top and bottom plates one by one to reduce the impact of main cable deformation on the bridge line shape after the segments are hoisted. Traditional construction methods using temporary steel slabs cannot achieve multi-point simultaneous welding. Instead, the steel box girder segments must be spliced ​​together step by step, which inevitably leads to cumulative splicing errors and prolongs the construction period of the steel box girder for long-span suspension bridges. To address these issues, a simpler, faster, and more reliable connection structure is needed. Summary of the Invention

[0004] The purpose of the present invention is to provide a steel box girder segment assembly connection structure and a construction method thereof, wherein the connection structure does not need to be dismantled after the steel box girder segments are circumferentially welded and can serve as a permanent stiffening rib of the steel box girder.

[0005] The objectives of the present invention can be achieved through the following technical solutions: a steel box girder segment assembly and connection structure, including a steel box girder segment and an embedded corrugated plate; the top plate and the bottom plate of the steel box girder segment are welded with transverse stiffening ribs, longitudinal stiffening ribs and longitudinal slots for use with the embedded corrugated plates in sequence, the longitudinal stiffening ribs and the longitudinal slots pass vertically through the transverse stiffening ribs, the embedded corrugated plates are installed in the longitudinal slots on adjacent steel box girder segments, the movable direction of the corrugated plates at the connection is the longitudinal bridge direction, perpendicular to the vertical load, which can provide a larger shear bearing capacity and limit the vertical displacement between segments.

[0006] Furthermore, the transverse stiffening ribs are provided with holes for the longitudinal stiffening ribs, longitudinal slots and embedded corrugated plates to penetrate. The position, size and shape of the holes depend on the installation position, size and shape of the longitudinal stiffening ribs, longitudinal slots and embedded corrugated plates, and can be adjusted according to actual installation requirements.

[0007] Furthermore, the longitudinal stiffening ribs and longitudinal slots pass through the holes on the transverse stiffening ribs and are fully welded to the transverse stiffening ribs, the top plate and the bottom plate of the steel box beam.

[0008] Furthermore, the welding of the transverse stiffening ribs to the top plate and bottom plate of the steel box beam segment, and the welding of the longitudinal stiffening ribs and longitudinal slots to the transverse stiffening ribs, the top plate and bottom plate of the steel box beam are performed in the form of fillet welds.

[0009] Furthermore, the longitudinal stiffening ribs include U-shaped ribs.

[0010] Furthermore, the number of the longitudinal slots is 15-20% of the number of the longitudinal stiffening ribs and can be adjusted according to actual installation requirements.

[0011] Furthermore, the longitudinal slots are evenly arranged between the longitudinal stiffening ribs to ensure the vertical stiffness and bending bearing capacity of the steel box girder.

[0012] Furthermore, the length of the embedded corrugated plate is the sum of the lengths of two adjacent steel box girder segments.

[0013] Furthermore, the embedded corrugated plate is coated with lubricant to make the embedding process smoother.

[0014] Furthermore, the connection between adjacent steel box girder segments is performed by girth welding, and the steel components are connected by mechanical interlocking before girth welding.

[0015] The second object of the present invention is to provide a construction method for assembling and connecting steel box girder segments. First, transverse stiffening ribs are welded on the top plate and bottom plate of the steel box girder segment. The transverse stiffening ribs are provided with holes for longitudinal stiffening ribs, longitudinal slots and embedded corrugated plates. Then, the longitudinal stiffening ribs and longitudinal slots arranged perpendicular to the transverse stiffening ribs are inserted and installed through the holes. Then, the longitudinal stiffening ribs, longitudinal slots and transverse stiffening ribs, the top plate and the bottom plate of the steel box girder are welded to complete the prefabrication of the steel box girder segment. During assembly, the embedded corrugated plates are installed in the longitudinal slots on the adjacent steel box girder segments.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] 1. The steel box girder segment assembly connection structure of the present invention comprises transverse stiffening ribs, longitudinal stiffening ribs, longitudinal slots, and embedded corrugated plates used in conjunction with the longitudinal slots, welded to the top and bottom plates of the steel box girder. Pre-assembly of the steel box girder segments prior to circumferential welding is achieved by inserting the embedded corrugated plates into the longitudinal slots of adjacent steel box girder segments. This connection structure prevents relative displacement between the steel box girder segments during subsequent welding. After the steel box girder is hoisted, the assembly alignment is achieved, and there are no gaps or misalignments between the beam segments, facilitating circumferential welding between the beam segments.

[0018] 2. The embedded corrugated plates in the steel box girder segment assembly connection structure of the present invention enable rapid pre-assembly of segments without welding. After the steel box girder segments are circumferentially welded, they do not need to be removed and can serve as permanent stiffeners for the steel box girder, improving the bending and torsional strength of the steel box girder cross-section. Furthermore, compared to the existing method of welding temporary steel slabs to assist in positioning steel box girder segments, the present invention simplifies the process, shortens the construction period, significantly improves the shear resistance of the joint, and avoids surface damage to the steel box girder caused by the removal of temporary steel slabs.

[0019] 3. The use of the steel box girder segment assembly connection structure of the present invention allows for immediate welding of steel box girder segments after pre-assembly, whereas conventional construction methods require that all segment top and bottom plates be hoisted before welding can proceed. This facilitates the acceleration of the construction schedule for multi-segment assembly of long-span steel box girder bridges. Especially for long-span steel box suspension bridges, the present invention reduces the impact of main cable deformation after segment hoisting on the bridge's linear shape, significantly accelerating construction progress.

[0020] 4. The steel box girder segment assembly and connection structure of the present invention has a simple structure, is easy to construct, and has high construction precision. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the steel box girder segment structure of the present invention;

[0022] Figure 2 It is a partial schematic diagram of the top plate of the steel box girder segment of the present invention;

[0023] Figure 3 This is a schematic diagram of the steel box girder segment assembly structure of the present invention;

[0024] Figure 4 It is a partial schematic diagram of the top plate assembly of the steel box girder segment of the present invention;

[0025] Figure 5 Schematic diagram of the interlacing relationship between the transverse ribs, slots and corrugated plates on the steel box girder segment of the present invention;

[0026] Figure 6 Schematic diagram of the local structure of the transverse rib in the present invention;

[0027] Figure 7 Schematic diagram of the structure of the slot and the corrugated plate in the present invention;

[0028] Figure 8 This is a schematic diagram of the bottom plate assembly of multiple steel box girder segments after the connection structure of the present invention is activated;

[0029] The markings in the figure are: 1: steel box girder segment; 11: top plate; 12: bottom plate; 2: embedded corrugated plate; 3: transverse stiffening rib; 4: longitudinal stiffening rib; 5: longitudinal slot. DETAILED DESCRIPTION

[0030] The present invention will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, those skilled in the art will be able to make several changes and improvements without departing from the scope of the present invention, all of which fall within the scope of protection of the present invention.

[0031] The equipment used in the following examples are all commercially available equipment.

[0032] Example 1

[0033] See also Figure 1-8 , a steel box girder segment assembly connection structure of the present invention comprises a steel box girder segment 1 and an embedded corrugated plate 2;

[0034] The steel box girder segment 1 includes transverse stiffening ribs 3 fully welded to the top plate 11 and the bottom plate 12 during the segment prefabrication process. The transverse stiffening ribs 3 are provided with holes for the longitudinal stiffening ribs 4, longitudinal slots 5, and embedded corrugated plates 2 used in conjunction with the longitudinal slots 5. The longitudinal stiffening ribs 4 and the longitudinal slots 5 pass through the holes in the transverse stiffening ribs 3 and are fully welded to the transverse stiffening ribs 3, the steel box girder top plate 11, and the bottom plate 12 using fillet welds. The longitudinal stiffening ribs 4 include U-shaped ribs, the number of longitudinal slots 5 is 15-20% of the number of longitudinal stiffening ribs 4, and the longitudinal slots 5 are evenly arranged between the longitudinal stiffening ribs 4. The openings of the longitudinal slots 5 converge inward, and the width of the slot opening at the end away from the top plate 11 is the sum of the width of the embedded corrugated plate 2 opening and twice the plate thickness.

[0035] After the segment is hoisted to the predetermined assembly position, the embedded corrugated plate 2 is inserted into the longitudinal slot 5 on the adjacent steel box girder segment 1 to complete the pre-assembly; wherein, the length of the embedded corrugated plate 2 is the sum of the lengths of the two adjacent steel box girder segments 1.

[0036] The construction method of the steel box girder segment assembly and connection structure of the present invention is: first, transverse stiffening ribs 3 are welded on the top plate 11 and the bottom plate 12 of the steel box girder segment 1, and the transverse stiffening ribs 3 are provided with holes for longitudinal stiffening ribs 4, longitudinal slots 5 and embedded corrugated plates 2 to be inserted; then, the longitudinal stiffening ribs 4 and longitudinal slots 5 arranged perpendicular to the transverse stiffening ribs 3 are inserted and installed through the holes, and then the longitudinal stiffening ribs 4, longitudinal slots 5 are welded to the transverse stiffening ribs 3, the steel box girder top plate 11 and the bottom plate 12, thereby completing the prefabrication of the steel box girder segment; during assembly, the embedded corrugated plates 2 are installed in the longitudinal slots 5 on the adjacent steel box girder segments 1.

[0037] The assembly steps of the steel box girder segment assembly connection structure of the present invention before the steel box girder segment is circumferentially welded are as follows: after the steel box girder segment 1 is prefabricated, during the construction of the beam bridge or suspension bridge, two adjacent steel box girder segments 1 are hoisted by a crane and then positioned and adjusted so that the relative positions of the two segments can ensure that the embedded corrugated plate 2 is smoothly embedded. The embedded corrugated plate 2 is hoisted into place and initially positioned and docked using positioning blocks or other positioning devices. When the docking error between the segments is within 3mm, the embedded corrugated plate 2 is inserted, and then the circumferential welding between the segments is carried out normally without adding additional positioning auxiliary devices. In order to make the embedding process smoother, lubricating oil can be applied to the embedding part. During the segment assembly process, the loads borne by the segments are mainly their own weight and the gravity of the construction equipment, both of which are vertical loads. After adopting the connection structure of the present invention, the movable direction of the embedded corrugated plate 2 at the connection is the longitudinal bridge direction, which is perpendicular to the vertical load, can provide a larger shear bearing capacity, and limit the vertical displacement between the segments. A pre-assembly test is carried out during the segment production process to ensure that the embedded corrugated plate on the assembly platform is smoothly embedded. This connection structure can help the steel box girder segments to maintain relative displacement between the segments during the further welding process.

[0038] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A steel box girder segment assembly connection structure, characterized in that: It comprises a steel box girder segment (1) and an embedded corrugated plate (2); transverse stiffening ribs (3), longitudinal stiffening ribs (4) and longitudinal slots (5) used in conjunction with the embedded corrugated plate (2) are welded on the top plate (11) and the bottom plate (12) of the steel box girder segment, the longitudinal stiffening ribs (4) and the longitudinal slots (5) vertically pass through the transverse stiffening ribs (3), the embedded corrugated plate (2) is inserted into the longitudinal slots (5) installed on the adjacent steel box girder segment (1), and the movable direction of the embedded corrugated plate (2) at the connection is the longitudinal bridge direction, which is perpendicular to the vertical load; The length of the embedded corrugated plate (2) is the sum of the lengths of two adjacent steel box beam segments (1).

2. The steel box girder segment assembly and connection structure according to claim 1, characterized in that: The transverse stiffening ribs (3) are provided with holes for longitudinal stiffening ribs (4), longitudinal slots (5), and holes for inserting and inserting the corrugated plates (2).

3. The steel box girder segment assembly and connection structure according to claim 2, characterized in that: The longitudinal stiffening ribs (4) and the longitudinal slots (5) pass through the holes on the transverse stiffening ribs (3) and are fully welded to the transverse stiffening ribs (3), the steel box girder top plate (11) and the bottom plate (12).

4. The steel box girder segment assembly and connection structure according to claim 3, characterized in that: The transverse stiffening ribs (3) are welded to the top plate (11) and the bottom plate (12) of the steel box beam segment (1) using fillet welds; the longitudinal stiffening ribs (4), the longitudinal slots (5), the transverse stiffening ribs (3), the top plate (11) and the bottom plate (12) of the steel box beam segment (1) are welded to the top plate (11) and the bottom plate (12) using fillet welds.

5. The steel box girder segment assembly and connection structure according to claim 1, characterized in that: The longitudinal stiffening ribs (4) include U-shaped ribs.

6. The steel box girder segment assembly and connection structure according to claim 1, characterized in that: The number of the longitudinal slots (5) is 15-20% of the number of the longitudinal stiffening ribs (4); and the longitudinal slots (5) are evenly arranged between the longitudinal stiffening ribs (4).

7. The steel box girder segment assembly and connection structure according to claim 1, characterized in that: The embedded corrugated plate (2) is coated with lubricant.

8. The steel box girder segment assembly and connection structure according to claim 1, characterized in that: The connection method between the adjacent steel box beam segments (1) is girth welding.

9. A construction method for the steel box girder segment assembly and connection structure according to claim 1, characterized in that: First, transverse stiffening ribs (3) are welded on the top plate (11) and the bottom plate (12) of the steel box girder segment (1), and the transverse stiffening ribs (3) are provided with holes for longitudinal stiffening ribs (4), longitudinal slots (5) and embedded corrugated plates (2) to be inserted; then, longitudinal stiffening ribs (4) and longitudinal slots (5) arranged perpendicular to the transverse stiffening ribs (3) are inserted and installed through the holes; then, the longitudinal stiffening ribs (4), longitudinal slots (5) are welded to the transverse stiffening ribs (3), the steel box girder top plate (11) and the bottom plate (12), thereby completing the prefabrication of the steel box girder segment; during assembly, the embedded corrugated plates (2) are installed in the longitudinal slots (5) on the adjacent steel box girder segments (1).

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