Steel box girder splicing structure

Abstract

The invention relates to a steel box girder splicing structure, and belongs to the technical field of road construction. The sealing structure comprises adjacent steel box girders and a transition connecting section arranged between the two sets of steel box girders, the transition connecting section comprises a transition beam section, telescopic bases and a sealing structure, the steel box girders and the telescopic bases are fixed to the two sides of the transition beam section respectively, and a sealing gap for installation of the sealing structure is formed by the two sets of telescopic bases. A connecting part is arranged at the end of the steel box beam, and a reinforcing structure connected with the transition beam section in a sealed mode is arranged on the connecting part. The sealing effect of the end of the steel box girder is improved.

Description

Technical Field

[0001] The present application relates to the technical field of road construction, and particularly relates to a splicing structure of a steel box girder. Background Art

[0002] The steel box girder is one of the most important main girder structural forms in modern long-span bridges. With its significant advantages such as high material strength, light self-weight, large spanning capacity, high precision in factory manufacturing, and fast on-site installation speed, it has been extremely widely used in bridge projects at home and abroad.

[0003] The core structure of the steel box girder is a closed box-shaped section welded by steel plates. Its main components include a top plate, a bottom plate, diaphragms, and longitudinal diaphragms. In order to adapt to longitudinal displacements caused by temperature changes, concrete shrinkage changes, load effects, etc., and prevent the beam body from being damaged due to restricted deformation, expansion joints are usually provided at the connection parts between adjacent sections of the steel box girder, or between the steel box girder and the abutment / other structures.

[0004] The expansion joint area is exposed to the outside for a long time and is a key part where corrosive media such as rainwater and snowmelt are likely to penetrate. The infiltrated water will accumulate at the end of the steel box girder, causing severe corrosion of the steel and possibly further spreading to the main structure inside the box girder. Summary of the Invention

[0005] In order to improve the sealing effect at the end of the steel box girder, the present application provides a splicing structure of a steel box girder. The expansion joint sealing structure at the end of the steel box girder provided by the present application adopts the following technical solutions: An expansion joint sealing structure at the end of a steel box girder includes adjacent steel box girders and a transition connection section provided between the two groups of steel box girders. The transition connection section includes a transition beam section, a telescopic base, and a sealing structure. The two sides of the transition beam section are respectively fixed to the steel box girder and the telescopic base. A sealing gap for installing the sealing structure is formed between the two groups of telescopic bases. A connection part is provided at the end of the steel box girder, and a strengthening structure for sealing connection with the transition beam section is provided at the connection part.

[0006] By adopting the above technical solutions, setting the transition connection section can adapt to the longitudinal displacement of the steel box girder, reduce the probability of damage caused by restricted deformation of the beam body. The transition beam section connects the steel box girder and the telescopic base, provides an installation position for the sealing structure, and at the same time reduces the direct contact between the end of the steel box girder and corrosive substances such as rainwater at the expansion joint. The strengthening structure at the connection part enhances the sealing connection between the steel box girder and the transition beam section, reducing the infiltration of corrosive media such as rainwater into the end of the steel box girder.

[0007] Optionally, the top of the connecting part is flush with the top of the transition beam section, and the top of the transition beam section is lower than that of the steel box girder. The strengthening structure includes strengthening stud bolts arranged on the top of the connecting part and the transition beam section, a crack prevention mesh sheet hung on the strengthening stud bolts, and a UHPC layer poured on the crack prevention mesh sheet. The top of the UHPC layer is flush with the top of the steel box girder.

[0008] By adopting the above technical solution, the top of the connecting part is flush with the top of the transition beam section and the top of the transition beam section is lower than that of the steel box girder, which is convenient for reasonably arranging the strengthening structure. The strengthening stud bolts can enhance the connection strength between the connecting part and the top of the transition beam section. The crack prevention mesh sheet is hung on the strengthening stud bolts, which can prevent the structure from cracking and improve the structural strength of the strengthening structure. The top of the UHPC layer poured on the crack prevention mesh sheet is flush with the top of the steel box girder, making the surface of the overall structure flat and realizing the fixation of the steel box girder and the transition beam section.

[0009] Optionally, the transition beam section includes a top plate unit, a bottom plate unit, a web unit and an end sealing plate. The web unit is fixed between the top plate unit and the bottom plate unit. The connecting part has a box groove for the web unit to insert. A connecting plate for cooperating with the strengthening stud bolts to be fixed is arranged at the top of the web unit. The connecting plate is provided with a positioning connection hole for the strengthening stud bolts to pass through, and a limiting ring for the connecting plate to be inserted and positioned is arranged inside the connecting part.

[0010] By adopting the above technical solution, the web unit is inserted into the box groove of the connecting part and is positioned and abutted against the limiting ring, realizing the preliminary positioning and connection of the transition beam section and the connecting part. The connecting plate is cooperated with the strengthening stud bolts to be fixed, and the positioning connection hole is provided for accurate installation, further improving the connection strength between the transition beam section and the connecting part and enhancing the connection stability and sealing performance of the connection part between the transition beam section and the end of the steel box girder.

[0011] Optionally, a pressing component for being pushed by the strengthening stud bolt is arranged at the bottom of the connecting plate, and a sealing strip corresponding to the pushing end of the pressing component is arranged at the top of the connecting plate; The pressing component includes a pressing arc plate and a pressing rotating shaft for rotatably connecting the driving arc plate. The pressing arc plate is respectively provided with a driving plate and a pressing plate on both sides of the pressing rotating shaft. The driving plate has a driving arc groove corresponding to the positioning connection hole, and the pressing plate and the sealing strip are correspondingly arranged.

[0012] By adopting the above technical solution, the strengthening stud bolt can push the driving plate of the pressing component, making the pressing arc plate rotate around the pressing rotating shaft, and then driving the pressing plate to extrude the sealing strip, enhancing the sealing effect between the connecting plate and the connecting part and reducing the possibility of corrosive media such as rainwater and snowmelt infiltrating into the end of the steel box girder.

[0013] Optionally, a driving limit plate inserted into the connecting plate is provided at the end of the driving plate away from the pressing rotating shaft. The connecting plate is provided with a driving arc groove for the driving limit plate to rotate, and a driving reset member is arranged in the driving arc groove. Two ends of the driving reset member respectively abut against the bottom wall of the driving arc groove and the driving limit plate; A first sealing groove for installing the sealing strip is provided at the top of the connecting plate, and pressing through holes for the pressing plate to pass through are spaced apart on the bottom wall of the first sealing groove.

[0014] By adopting the above technical solution, the driving limit plate and the driving arc groove can limit the rotation range of the pressing assembly, the driving reset member can make the pressing assembly always stay in the initial position, the first sealing groove is convenient for installing the sealing strip, and the pressing through holes facilitate the pressing plate to press the sealing strip, thereby improving the sealing performance at the expansion joint at the end of the steel box girder and reducing the probability of corrosive media such as rainwater and snowmelt infiltrating into the end of the steel box girder.

[0015] Optionally, a base groove for installing the expansion base is provided on the side of the transition beam section away from the connecting part. A plurality of reserved steel bars are arranged at intervals along the length direction of the expansion joint at the top of the base groove. The expansion base includes an expansion base plate, a plurality of anchoring plates arranged at intervals on one side of the length direction of the expansion base plate, anchoring steel bars welded to the expansion plate, and horizontal steel bars for fixing the anchoring steel bars and the reserved steel bars. The anchoring steel bars and the reserved steel bars correspond to each other one by one.

[0016] By adopting the above technical solution, a base groove is provided on the side of the transition beam section away from the connecting part for installing the expansion base. Reserved steel bars are provided at the top of the base groove. The anchoring steel bars of the expansion base correspond to them and are fixed by horizontal steel bars, realizing the stable installation and positioning of the expansion base. At the same time, a plurality of anchoring plates increase the connection stability between the expansion base and the expansion joint area, improving the overall performance and reliability of the expansion joint sealing structure at the end of the steel box girder.

[0017] Optionally, it further includes a connecting member connecting two adjacent expansion bases. The connecting member includes a first connecting rod, a second connecting rod, and a connecting locking member for locking the first connecting rod and the second connecting rod. The first connecting rod and the second connecting rod are slidably connected, and a connecting rod limiting groove for the first connecting rod and the second connecting rod to be inserted is provided on the side wall of the expansion base.

[0018] By adopting the above technical solution, the setting of the connecting member can connect two adjacent expansion bases, facilitating the hoisting equipment to install the expansion base in the expansion joint. The sliding connection of the first connecting rod and the second connecting rod in cooperation with the connecting locking member can flexibly adjust the connection length and lock it to adapt to the sealing gap requirements in different situations. The connecting rod slot is convenient for the first connecting rod and the second connecting rod to be inserted into the expansion base to realize the connection.

[0019] Optionally, a positioning slide bar is slidably mounted at the bottom of the first connecting rod and the second connecting rod. An insertion positioning slot for inserting the positioning slide bar is formed in the base slot. The connecting member includes a slide bar driving assembly for driving the positioning slide bar to fall. The slide bar driving assembly includes a first driving rod, a second driving rod and a driving elastic member. The first driving rod and the positioning slide bar are arranged in parallel. The second driving rod is horizontally arranged between the first driving rod and the positioning slide bar. A first inclined surface for the first driving rod to push is arranged at the end of the second driving rod. A second inclined surface for the second driving rod to push is arranged at the top of the positioning slide bar. When the second driving rod moves horizontally towards the positioning slide bar, the second driving rod drives the positioning slide bar to move vertically downward, and the bottom end of the positioning slide bar is located below the telescopic base.

[0020] By adopting the above technical solution, by using the slide bar driving assembly, when the second driving rod moves horizontally towards the positioning slide bar, the positioning slide bar can be driven to move vertically downward and the bottom end is located below the telescopic base. By inserting the positioning slide bar into the insertion positioning slot of the base slot, the connection stability between the connecting member and the transition beam section can be enhanced.

[0021] Optionally, a plunger locking member is arranged on the side wall of the positioning slide bar. The connecting member is provided with a plunger locking hole for locking and cooperating with the plunger member and a third driving rod for driving the positioning slide bar to move downward. The plunger locking member includes a plunger housing, a plunger elastic member and a plunger locking block. A guiding inclined surface is arranged on the side of the plunger locking block away from the second driving rod. When the plunger locking block is inserted into the plunger locking hole, the positioning slide bar is in a locked state. The depth of the positioning slot is greater than the extended length of the positioning slide bar in the locked state.

[0022] By adopting the above technical solution, the locking of the positioning slide bar is realized to ensure the stability of the connecting member; the depth of the positioning slot is greater than the extended length of the positioning slide bar in the locked state, so that after the telescopic base is placed in the base slot, there is a gap between the end of the positioning slide bar and the bottom wall of the positioning slot. At this time, by pulling the third driving rod, the locking of the connecting member and the positioning slide bar can be realized.

[0023] Optionally, the sealing structure is arranged between two adjacent groups of telescopic bases. The sealing structure includes a rubber sealing strip, a sealing filling glue layer and an expansion strip from top to bottom.

[0024] By adopting the above technical solution, most of the rainwater is guided to the bridge deck drainage system under the action of the rubber sealing strip. Some water droplets or water vapor enter the sealing gap downward through the gap. The expansion strip absorbs water and expands to block the penetrated gap. Finally, the sealing filling glue layer is used for final sealing. It can move synchronously with the longitudinal movement of the telescopic base, and three waterproof structures with different principles work together.

[0025] In summary, this application includes at least one of the following beneficial technical effects: The transition connection section and sealing structure can prevent corrosive media such as rainwater and melted snow from penetrating into the ends of the steel box beam, thus preventing steel from rusting and spreading to the main structure inside the box beam, thus ensuring the safety of the steel box beam structure; Improve the sealing performance of the expansion joint area by setting up components such as compression components and sealing strips; By setting the connecting member, it is convenient to position the telescopic base on the base groove, ensuring that the axis of the sealing gap and the axis of the expansion joint are coaxial. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic cross-sectional diagram of the overall structure of an embodiment of the present application.

[0027] Figure 2 It is a cross-sectional schematic diagram of the transition beam section and the steel box beam of an embodiment of the present application.

[0028] Figure 3 yes Figure 2 A local enlarged schematic diagram of point A in the middle.

[0029] Figure 4 It is a schematic cross-sectional view of the clamping plate in the Y direction according to an embodiment of the present application.

[0030] Figure 5 It is a cross-sectional schematic diagram of the telescopic base and sealing structure of an embodiment of the present application.

[0031] Figure 6 It is a cross-sectional schematic diagram of the connecting member and the telescopic base according to an embodiment of the present application.

[0032] Figure 7 It is a cross-sectional schematic diagram of the first connecting rod and the second connecting rod after being fixed in the embodiment of the present application.

[0033] Figure 8 It is a schematic diagram of the connecting member of the embodiment of the present application and the connecting rod limiting groove of the telescopic base after being plugged in.

[0034] Description of reference numerals: 1. Steel box girder; 11. Connection part; 111. Box body groove; 112. Limit ring; 113. Second sealing groove; 12. Reinforcement structure; 121. Reinforcement stud; 122. Crack prevention mesh; 123. UHPC layer; 2. Transition connection section; 3. Transition beam section; 31. Top plate unit; 32. Bottom plate unit; 33. Web unit; 34. End sealing plate; 35. Connection plate; 351. Positioning connection hole; 352. Compression support; 353. First sealing groove; 3531. Compression through hole; 354. Driving arc groove; 355. Driving reset part; 36. Compression component; 361. Compression arc plate; 3611. Driving plate; 36111. Driving limit plate; 3612. Compression plate; 36121. Wave compression surface; 362. Compression rotating shaft; 37. Base groove; 371. Reserved steel bars; 372. Connecting rod slot; 38. Sealing strip; 4. Telescopic base; 41. Telescopic base plate; 42. Anchor plate; 43. Anchor steel bars; 44. Horizontal steel bars; 45. Guide track; 46. Connecting rod limit groove; 5. Sealing structure; 51. Rubber sealing strip; 52. Expansion strip; 53. Sealing glue layer; 6. Connecting member; 61. First connecting rod; 611. Insertion joint; 612. Locking strip hole; 614. First lifting groove; 615. Plunger locking hole; 62. Second connecting rod; 621. Insertion slot; 622. Locking through hole; 63. Connection locking part; 64. Positioning slide bar; 641. Second inclined surface; 642. Plunger locking part; 6421. Plunger locking block; 6422. Guide inclined surface; 65. Slide bar driving component; 651. First driving rod; 652. Second driving rod; 6521. First inclined surface; 653. Driving elastic part; 654. Third driving rod. Detailed implementation mode

[0035] The following will further elaborate on this application Figure 1-8 in conjunction with the appended drawings.

[0036] The embodiment of this application discloses a steel box girder splicing structure.

[0037] Referring to Figure 1 , a steel box girder splicing structure includes adjacent steel box girders 1 and a transition connection section 2 arranged between two groups of steel box girders 1. There is a gap at the end of adjacent steel box girders 1, and this gap is the expansion joint. Define the length direction of the steel box girder 1 as the X direction, the width direction as the Y direction, and the height direction as the Z direction.

[0038] The transition connection section 2 includes a transition beam section 3, a telescopic base 4, and a sealing structure 5. The overall shape of the transition beam section 3 is a rectangular block, and its cross-section is adapted to the cross-section of the steel box girder 1. The opposite sides of the transition beam section 3 are respectively fixedly connected to the steel box girder 1 and the telescopic base 4. A sealing gap for installing the sealing structure 5 is formed between the telescopic bases 4 on two groups of steel box girders 1, and the central axis of the sealing gap and the expansion joint in the X direction are coaxial.

[0039] Referring to Figure 2 and Figure 3 , a connecting part 11 is integrally arranged at the end of the steel box girder 1, and a strengthening structure 12 for sealing connection with the transition beam section 3 is arranged on the connecting part 11. The top of the connecting part 11 is flush with the top of the transition beam section 3. The top of the transition beam section 3 is lower than the top of the steel box girder 1 so as to form a casting space for arranging the strengthening structure 12.

[0040] The strengthening structure 12 includes strengthening stud welds 121, crack prevention mesh sheets 122 and a UHPC layer 123. The strengthening stud welds 121 are fixed on the tops of the connecting part 11 and the transition beam section 3 through a spot welding array. The crack prevention mesh sheets 122 are composed of a plurality of welded steel bars and are placed on the tops of the connecting part 11 and the steel box girder 1. The UHPC layer 123 is cast on the top of the crack prevention mesh sheets 122. In this embodiment, the thickness of the UHPC layer 123 is 10 cm, and the top of the UHPC layer 123 is flush with the top surface of the steel box girder 1. When casting the UHPC layer 123, wooden templates are arranged on the outer sides of the connecting part 11 and the transition beam section 3 so that the cross-section of the formed UHPC layer 123 is adapted to the steel box girder 1.

[0041] The whole of the transition beam section 3 is consistent with the steel box girder 1 and includes a top plate unit 31, a bottom plate unit 32, a web unit 33 and an end sealing plate 34. The web unit 33 is fixed between the top plate unit and the bottom plate unit 32 and includes transverse diaphragms and longitudinal diaphragms. The end sealing plate 34 is arranged on the side of the web unit 33 away from the connecting part 11 and is used for sealing and covering the box groove communicating the web unit 33 and the steel box girder 1.

[0042] A box body groove 111 for horizontally inserting the web unit 33 is formed in the side wall of the connecting part 11, and the top of the web unit 33 has a connecting plate 35 for cooperating with the strengthening stud welds 121 for fixation. The connecting plate 35 and the web unit 33 are integrally arranged, and a positioning connection hole 351 for the strengthening stud welds 121 to pass through is formed in the top of the connecting plate 35. Through the cooperation and fixation of the positioning connection hole 351 and the strengthening stud welds 121, the structural strength of the connecting part 11 and the transition beam section 3 is further improved. Among them, a limiting ring 112 for inserting and positioning the connecting plate 35 is further arranged in the box body groove 111 of the connecting part 11 so that the positioning connection hole 351 corresponds to the through hole on the connecting part 11 for the strengthening stud welds 121 to pass through.

[0043] In order to improve the connection strength between the transition beam section 3 and the connecting part 11, a pressing component 36 and a sealing strip 38 are further arranged on the connecting plate 35. The pressing component 36 includes a pressing arc plate 361 and a pressing rotating shaft 362. A pressing bracket 352 for fixedly installing the pressing rotating shaft 362 is arranged at the bottom of the connecting plate 35. The pressing arc plate 361 is rotatably installed on the pressing rotating shaft 362, and a driving plate 3611 and a pressing plate 3612 are respectively arranged on both sides of the axis of the pressing rotating shaft 362.

[0044] Combined with Figure 4 , the pressing plate 3612 is arranged to extend along the Y direction, and the top of the pressing plate 3612 is provided with a wave pressing surface 36121 at intervals. The top of the connecting plate 35 is provided with a first sealing groove 353 for installing the sealing strip 38. The bottom of the connecting portion 11 has a second sealing groove 113 corresponding to the first sealing groove 353. The second sealing groove 113 cooperates with the wave pressing surface 36121, and the first sealing groove 353 has a pressing through hole 3531 corresponding to the wave crest of the wave pressing surface 36121, so that the driving plate 3611 moves upward through the pressing through hole 3531, and the sealing strip 38 is pressed and deformed.

[0045] The driving plate 3611 corresponds to the positioning connection hole 351, so that the strengthening stud 121 abuts against the driving plate 3611 after passing through the positioning connection hole 351, causing the pressing plate 3612 to rotate downward, and then driving the pressing plate 3612 to rotate upward.

[0046] On the side of the driving plate 3611 away from the rotating shaft, a driving limiting plate 36111 inserted into the connecting plate 35 is integrally provided. The driving limiting plate 36111 is an arc-shaped plate with the pressing rotating shaft 352 as the rotation axis. The connecting plate 35 has a driving arc groove 354 that cooperates with the driving limiting plate 36111, and a driving reset member 355 is arranged in the driving arc groove 354. The driving reset member 355 is a spring member, and its two ends respectively abut against the bottom wall of the driving arc groove 354 and the driving limiting plate 36111, and is used to ensure the stability of the driving limiting plate 36111 in the initial state.

[0047] The top of the pressing plate 3612 also has an abutting arc groove, and the abutting arc groove is a concave arc surface. The setting of the abutting arc groove ensures that the pushing effect of the strengthening stud 121 on the pressing arc plate 361 is relatively stable and smooth. At the same time, the concrete or liquid impurities infiltrated from the positioning connection hole 351 can be stored in the abutting arc groove, so as to further improve the sealing effect between the connecting portion 11 and the transition beam section 3, and reduce the probability of corrosive impurities entering the inner box groove of the steel box girder 1.

[0048] Refer to Figure 5 , on the side of the transition beam section 3 away from the connecting portion 11, a base groove 37 for installing the expansion base 4 is provided. A plurality of reserved steel bars 371 are uniformly arranged at intervals along the Y direction on the top of the base groove 37. The reserved steel bars 371 are welded and fixed to the web unit 33 of the transition beam section 3, and a base layer is formed by concrete pouring.

[0049] The telescopic base 4 includes a telescopic base plate 41, an anchoring plate 42, anchoring steel bars 43 and horizontal steel bars 44. The telescopic base plate 41 is a rectangular plate body, and its length direction is arranged parallel to the Y direction. The anchoring plate 42 is fixed on the side of the telescopic base plate 41 away from the expansion joint, and the anchoring plates 42 are arranged at intervals along the length direction of the telescopic base plate 41. The anchoring steel bars 43 are welded and fixed to the telescopic base plate 41, and the anchoring steel bars 43 are U-shaped steel bars with the opening facing upwards as a whole. The anchoring steel bars 43 correspond to the reserved steel bars 371 one by one, and the bottom of the anchoring steel bars 43 is located below the anchoring plate 42, so that the telescopic base 4 as a whole realizes support and positioning through the anchoring steel bars 43.

[0050] After the telescopic base 4 is positioned and placed in the positioning groove, then the horizontal steel bars 44 are arranged along the Y direction. The opposite sides of the horizontal steel bars 44 are abutted against the anchoring steel bars 43 and the reserved steel bars 371, and the horizontal steel bars 44 are welded to the reserved steel bars 371 and the anchoring steel bars 43 by spot welding.

[0051] The telescopic base 4 is hoisted and placed in the base groove 37 by a hoisting device. In order to ensure that the central axes of two adjacent groups of telescopic bases 4 and the axis of the expansion joint are coaxial, the present application further includes a connecting member 6. Two groups of telescopic bases 4 are connected by the connecting member 6, and the hoisting device hoists two groups of telescopic bases 4 through the connecting member 6 at the same time.

[0052] Refer to Figure 6 、 Figure 7 and Figure 8 As shown in, the connecting member 6 includes a first connecting rod 61, a second connecting rod 62 and a connecting locking member 63 for locking the first connecting rod 61 and the second connecting rod 62. Both the first connecting rod 61 and the second connecting rod 62 are L-shaped and are slidably matched with each other. The top of the first connecting rod 61 is provided with a plug connector 611, and the top of the second connecting rod 62 has a plugging groove 621 for the plug connector 611 to be inserted into. The connecting locking member 63 is a bolt member and is horizontally arranged along the Y direction. A locking strip hole 622 for arranging the connecting locking member 63 is opened on the second connecting rod 62, and opposite sides of the first connecting rod 61 have locking through holes 612 corresponding to the locking strip hole 622. The connecting locking member 63 passes through the locking strip hole 622 and the locking through holes 612 of the first connecting rod 61, and then the first connecting rod 61 and the second connecting rod 62 are locked by nuts.

[0053] The telescopic base 4 also has a connecting rod limiting groove 46 on the side wall away from the expansion joint for the horizontal insertion of the first connecting rod 61 and the second connecting rod 62. The first connecting rod 61 and the second connecting rod 62 have T-shaped blocks adapted to the connecting rod limiting groove 46, so that after the connecting member 6 and the telescopic base 4 are fitted and inserted, they are fixed in the Z direction, and the connecting member 6 and the telescopic base 4 move synchronously. The bottom of the connecting rod limiting groove 46 penetrates through the bottom of the telescopic base 4.

[0054] One end of each of the first link 61 and the second link 62 is slidably installed with a positioning slide bar 64. A link slot 372 that is inserted and matched with the positioning slide bar 64 is provided at the top of the base slot 37. The bottom of the link limiting slot 46 penetrates the bottom end face of the telescopic base 4. A slide bar driving assembly 65 for driving the positioning slide bar 64 to move downward is further provided on the connecting member 6.

[0055] The slide bar driving assembly 65 includes a first driving rod 651, a second driving rod 652, and a driving elastic member 653. The first driving rod 651 and the positioning slide bar 64 are arranged in parallel. The connecting member 6 has a first lifting slot 614 for the first driving rod 651 to lift and lower, and the bottom of the first lifting slot 614 is through. The second driving rod 652 is horizontally arranged in the X direction, and both ends of the second driving rod 652 are in contact with the end portions of the positioning slide bar 64 and the first driving rod 651 respectively.

[0056] The driving elastic member 653 is a compression spring member, and the driving elastic member 653 is sleeved on both the first driving rod 651 and the positioning slide bar 64. In the normal state of the driving elastic member 653, the bottom of the first driving rod 651 passes through the bottom of the first lifting slot 614, and the bottom of the second driving rod 652 is located outside the connecting member 6.

[0057] A first inclined surface 6521 is provided at one end of the second driving rod 652 close to the first driving rod 651, and the first inclined surface 6521 is inclined downward in the direction of the positioning slide bar 64. A second inclined surface 641 for the second driving rod 652 to push is provided at the top of the positioning slide bar 64. When placing the telescopic base 4, insert the first link 61 and the second link 62 into the link limiting slots 46 of the two groups of telescopic bases 4 respectively, and fix the connecting member 6 and the telescopic base 4 through bolts; install a plurality of connecting members 6 on the telescopic base 4, and then lift the telescopic base 4 by a hoisting device. The hook of the hoisting device is stuck in the first lifting slot 614. When the telescopic base 4 is lifted, the first driving rod 651 is lifted upward, driving the positioning slide bar 64 to move vertically downward, so that the end of the positioning slide bar 64 passes through the bottom opening of the link limiting slot 46; then move the telescopic base 4 above the base slot 37, and through the cooperation of the positioning slide bar 64 and the link slot 372, the preliminary positioning of the telescopic base 4 and the transition beam section 3 is realized, and at the same time, the axis of the sealing gap and the axis of the expansion joint are ensured to be coaxial.

[0058] After the hoisting equipment cancels the hoisting, the positioning slide rod 64 automatically moves upward to reduce the probability of relative sliding of the telescopic base 4. A plunger locking member 642 is further provided on the side wall of the positioning slide rod 64. The plunger locking member 642 includes a plunger housing, a plunger elastic member, and a plunger locking block 6421. The plunger housing is arranged in the horizontal direction. The plunger housing is press-fitted into the side wall of the positioning slide rod 64. The plunger elastic member is a spring member, and its two ends are respectively fixed to the bottom wall of the plunger housing and the plunger locking block 6421. The plunger locking block 6421 is a rectangular block, and a guiding inclined surface 6422 is provided on the top surface of the end of the plunger locking block 6421.

[0059] Both the first connecting rod 61 and the second connecting rod 62 are internally provided with a plunger locking hole 615 for the plunger locking block 6421 to be inserted and locked. A third driving rod 654 for driving the movement of the positioning slide rod 64 is provided on the outer side wall of the connecting member 6. The third driving rod 654 passes through the connecting member 6 and the positioning slide rod 64 and is fixedly connected.

[0060] When the hoisting equipment lifts the telescopic base 4, the plunger locking block 6421 is inserted into the plunger locking hole 615, so that after the hoisting equipment is removed, the end of the positioning slide rod 64 still remains in the state of passing through the connecting rod limiting groove 46. After the horizontal steel bars 44 are welded, the positioning slide rod 64 is lifted by the third driving rod 654. Under the action of the guiding inclined surface 6422, the plunger locking block 6421 is disengaged from the plunger locking hole 615, and finally the connecting member 6 is removed from the telescopic base 4.

[0061] Refer to Figure 5 , the sealing structure 5 is arranged between two groups of telescopic bases 4. The sealing structure 5 successively includes a rubber sealing strip 51, an expansion strip 52, and a sealant layer 53 from top to bottom. Among them, a guiding track 45 for installing the sealing strip is further provided on one side of the telescopic base 4 close to the expansion joint. The rubber sealing strip 51 is installed in the guiding track 45 in a limited way. The middle part of the rubber sealing strip 51 bulges upward so that the rainwater falling on the rubber sealing strip 51 can be guided to both sides of the rubber sealing strip 51. The second-layer expansion strip 52 is a water-swellable strip 52, which is located 5 - 10 mm below the sealing strip and is arranged in a fitting manner on the inner side of the telescopic base 4.

[0062] The implementation principle of a steel box girder splicing structure in an embodiment of the present application is as follows: The transition beam section 3 is fixed to the end of the steel box girder 1 through the strengthening structure 12; the sealing gap between the two expansion bases 4 is adjusted according to the design requirements of the expansion joint, and the two expansion bases 4 are fixed through the connecting member 6; through the hoisting equipment, hoisting is carried out from the bottom of the first driving rod 651, so that the two expansion bases 4 are lifted synchronously, so that the positioning slide rod 64 passes downward through the bottom of the expansion base 4, and is inserted into the connecting rod limiting groove 46 on the positioning slide rod 64 and the base groove 37 to realize the positioning placement of the expansion base 4. After the horizontal steel bars 44 are welded and fixed, the connecting member 6 is removed; then the sealing structure 5 is installed in sequence; finally, concrete is poured on the expansion base 4 so that the top surface of the expansion base 4 is flush with the top surface of the strengthening structure 12.

[0063] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A steel box girder splicing structure, characterized in that, It includes adjacent steel box girders (1) and a transition connection section (2) arranged between two groups of the steel box girders (1). The transition connection section (2) includes a transition beam section (3), a telescopic base (4), and a sealing structure (5). The two sides of the transition beam section (3) are respectively fixed to the steel box girder (1) and the telescopic base (4). A sealing gap for installing the sealing structure (5) is formed between two groups of the telescopic bases (4). A connection part (11) is arranged at the end of the steel box girder (1), and a strengthening structure (12) for sealing connection with the transition beam section (3) is arranged at the connection part (11).

2. The steel box girder splicing structure according to claim 1, characterized in that, The top of the connection part (11) is flush with the top of the transition beam section (3), and the top of the transition beam section (3) is lower than that of the steel box girder (1). The strengthening structure (12) includes strengthening welding studs (121) arranged at the top of the connection part (11) and the transition beam section (3), a crack-proof mesh sheet (122) hung on the strengthening welding studs (121), and a UHPC layer (123) cast on the crack-proof mesh sheet (122). The top of the UHPC layer (123) is flush with the top of the steel box girder (1).

3. A steel box girder splicing structure according to claim 2, characterized in that, The transition beam section (3) includes a top plate unit (31), a bottom plate unit (32), a web unit (33), and an end sealing plate (34). The web unit (33) is fixed between the top plate unit and the bottom plate unit (32). The connection part (11) has a box groove (111) for the web unit (33) to insert. A connecting plate (35) for cooperating with the strengthening welding studs (121) to be fixed is arranged at the top of the web unit (33). The connecting plate (35) is provided with positioning connection holes (351) for the strengthening welding studs (121) to pass through. A limiting ring (112) for inserting and positioning the connecting plate (35) is arranged in the connection part (11).

4. A steel box girder splicing structure according to claim 3, characterized in that, A pressing component (36) for being pushed by the strengthening welding studs (121) is arranged at the bottom of the connecting plate (35), and a sealing strip (38) corresponding to the pushing end of the pressing component (36) is arranged at the top of the connecting plate (35); The pressing component (36) includes a pressing arc plate (361) and a pressing rotating shaft (362) for the pressing arc plate (361) to be rotatably connected. Driving plates (3611) and pressing plates (3612) are respectively arranged on both sides of the pressing arc plate (361) at the pressing rotating shaft (362). The driving plate (3611) has an abutting arc groove corresponding to the positioning connection hole (351), and the pressing plate (3612) and the sealing strip (38) are correspondingly arranged.

5. A steel box girder splicing structure according to claim 4, characterized in that A driving limiting plate (36111) inserted into the connecting plate (35) is arranged at the end of the driving plate (3611) far away from the pressing rotating shaft (362). The connecting plate (35) is provided with a driving arc groove (354) for the driving limiting plate (36111) to rotate, and a driving resetting piece (355) is arranged in the driving arc groove (354). Both ends of the driving resetting piece (355) respectively abut against the bottom wall of the driving arc groove (354) and the driving limiting plate (36111); A first sealing groove (353) for installing the sealing strip (38) is provided at the top of the connecting plate (35), and pressing through holes (3531) for the pressing plate (3612) to pass through are spaced apart on the bottom wall of the first sealing groove (353).

6. A steel box girder splicing structure according to claim 1, characterized in that, On one side of the transition beam section (3) far from the connecting part (11), a base groove (37) for installing the telescopic base (4) is provided. A number of reserved steel bars (371) are spaced along the length direction of the expansion joint at the top of the base groove (37). The telescopic base (4) includes a telescopic base plate (41), a number of anchoring plates (42) spaced on one side of the length direction of the telescopic base plate (41), anchoring steel bars (43) welded to the telescopic base plate (41), and horizontal steel bars (44) for fixing the anchoring steel bars (43) and the reserved steel bars (371). The anchoring steel bars (43) and the reserved steel bars (371) are in one-to-one correspondence.

7. A steel box girder splicing structure according to claim 6, characterized in that, It further includes a connecting member (6) connecting two adjacent groups of telescopic bases (4). The connecting member (6) includes a first connecting rod (61), a second connecting rod (62), and a connecting locking member (63) for locking the first connecting rod (61) and the second connecting rod (62). The first connecting rod (61) and the second connecting rod (62) are slidably connected. A connecting rod limiting groove (46) for the first connecting rod (61) and the second connecting rod (62) to insert is provided on the side wall of the telescopic base (4).

8. A steel box girder splicing structure according to claim 7, characterized in that, A positioning slide bar (64) is slidably installed at the bottom of the first connecting rod (61) and the second connecting rod (62). An insertion positioning slot for the positioning slide bar (64) to insert is provided in the base groove (37). The connecting member (6) includes a slide bar driving assembly (65) for driving the positioning slide bar (64) to drop. The slide bar driving assembly (65) includes a first driving rod (651), a second driving rod (652), and a driving elastic member (653). The first driving rod (651) and the positioning slide bar (64) are arranged in parallel. The second driving rod (652) is horizontally arranged between the first driving rod (651) and the positioning slide bar (64). A first inclined surface (6521) for the first driving rod (651) to push is provided at the end of the second driving rod (652). A second inclined surface (641) for the second driving rod (652) to push is provided at the top of the positioning slide bar (64). When the second driving rod (652) moves horizontally towards the positioning slide bar (64), the second driving rod (652) drives the positioning slide bar (64) to move vertically downward, and the bottom end of the positioning slide bar (64) is located below the telescopic base (4).

9. A steel box girder splicing structure according to claim 8, characterized in that, The side wall of the positioning slide bar (64) is provided with a plunger locking member (642). The connecting member (6) is provided with a plunger locking hole (615) that locks and cooperates with the plunger locking member (642) and a third driving rod (654) for driving the positioning slide bar (64) to move downward. The plunger locking member (642) includes a plunger housing, a plunger elastic member, and a plunger locking block (6421). A guiding inclined surface (6422) is provided on the side of the plunger locking block (6421) away from the second driving rod (652).

10. A steel box girder splicing structure according to claim 1, characterized in that, The sealing structure (5) is arranged between two adjacent sets of telescopic bases (4). The sealing structure (5) includes a rubber sealing strip (51), an expansion strip (52), and a sealant layer (53) from top to bottom.

Images