Assembled steel box girder

Abstract

The assembled steel box girder comprises a first steel box girder and a second steel box girder, wherein the ends of the first steel box girder and the second steel box girder are in butt joint; a supporting beam is fixed in the first steel box beam, a cross rod is arranged on the surface of the supporting beam, a slidable telescopic arm is inserted into the cross rod, a jacking plate at the end of the telescopic arm is connected with an L-shaped rod, and a telescopic rod is inserted into the end of the L-shaped rod; through grooves matched with the L-shaped rods are formed in the surfaces of the two steel box girders, the telescopic rod on the first steel box girder side is sleeved with a rotatable nut, and the telescopic rod on the second steel box girder side is fixedly provided with a screw capable of being connected to the nut in a screwed mode. According to the scheme, the two steel box girders are driven to be in accurate butt joint through thread transmission, gaps are eliminated to improve the welding quality, and meanwhile the construction cost is reduced; the supporting beams and the transverse rods form a stable bearing foundation, the stability of the splicing process is guaranteed, construction efficiency and structural reliability are both considered, and the method is suitable for rapid splicing of bridge steel box girders.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steel box girder, in particular to a kind of assembled steel box girder. BACKGROUND

[0002] Steel box girder is the common structure form of large-span bridge, generally used in large-span bridge, because the appearance is like a box, so called steel box girder, generally by top plate, bottom plate, web, transverse diaphragm, longitudinal diaphragm and stiffener etc. It is connected by full welding mode, the overall structure of steel box girder is safe, and the bridge spliced by steel box girder is efficient and safe.

[0003] In the prior art, the patent number for CN221029569U is named a kind of assembled steel box girder, including first transverse diaphragm, the one side of first transverse diaphragm front is fixedly connected with fixed block, the fixed block is opened with locking groove, the locking groove is movably sleeved with locking device, the locking device includes fixed bottom plate, the other side of fixed bottom plate front is fixedly connected with connecting shaft, the connecting shaft is fixedly sleeved with connecting spring, the one end of connecting spring is fixedly connected with fixed bottom plate, the other end of connecting spring is fixedly connected with rotating bottom plate, the rotating bottom plate is movably sleeved with connecting shaft;Fixed frame is added between third transverse diaphragm and fourth transverse diaphragm, when one steel box girder is connected with the steel box girder placed stably, fixed bolt drops from the top of fixed frame along moving groove, guarantees the precision of steel box girder drop, is favorable for reducing the deviation when assembling.

[0004] However, the existing two groups of steel box girder are connected after abutting, need to be welded and fixed, since two groups of steel box girder are moved together by moving assembly, cannot guarantee close fitting, lead to welding quality to decline, influence the connecting strength of two groups of steel box girder. SUMMARY

[0005] The present application aims to provide a kind of assembled steel box girder to solve the problems raised in the above background.

[0006] In order to achieve the above object, the present application provides the following technical scheme: A spliced steel box girder, comprising a first steel box girder and a second steel box girder which are butt-jointed at the ends, a support beam is fixed in the first steel box girder, a crossbar is fixed on the surface of the support beam, an extension adjusting structure is arranged at the end of the crossbar, the extension adjusting structure comprises an extension arm which is inserted into the end of the crossbar and can slide along the axial direction of the crossbar, a top-holding plate is fixed at the end of the extension arm, a guide receiving module is arranged on the surface of the top-holding plate, the guide receiving module comprises an L-shaped rod which is fixed on the surface of the top-holding plate, and an extension rod is inserted into the end of the L-shaped rod; a through slot which is matched with the L-shaped rod is formed on the surface of the first steel box girder, and the through slot serves as a channel for the L-shaped rod to pass out of the steel box girder or to be received in the steel box girder; the first steel box girder and the second steel box girder are symmetrical in structure, and the ends of the extension rods of the two steel box girders are provided with matched butt-joint locking structures, the butt-joint locking structure comprises a rotatable nut which is sleeved on the end of the extension rod of the first steel box girder, and a screw rod which is fixed on the end of the extension rod of the second steel box girder, and the screw rod can be screwed into the nut.

[0007] Preferably, the first steel box girder and the second steel box girder are provided with a position locking assembly, the position locking assembly comprises a fixing groove formed on the surface of the two steel box girders and a fixing plate fixed on the surface of the L-shaped rod; the L-shaped rod can slide in the through slot, the fixing plate moves synchronously with the L-shaped rod and can be inserted into the fixing groove, and the fixing plate can be locked in the fixing groove by an external bolt.

[0008] Preferably, the L-shaped rod and the extension rod are provided with an anti-disengagement limiting assembly, the anti-disengagement limiting assembly comprises a pull ring fixed on the surface of the L-shaped rod, a first limiting ring arranged at one end of the extension rod inside the L-shaped rod, and a second limiting ring arranged at one end of the extension rod inside the nut; the first limiting ring can be held on the inner wall of the L-shaped rod to prevent the extension rod from completely disengaging from the L-shaped rod, and the second limiting ring is held on the inner wall of the nut to prevent the nut from falling off the end of the extension rod.

[0009] Preferably, the inside of the first steel box girder and the second steel box girder is provided with an elastic buffer assembly, the elastic buffer assembly comprises two groups of symmetrical elastic plates and arc-shaped plates fixed at the ends of the elastic plates; the two groups of elastic plates are symmetrically distributed with the moving track of the top-holding plate as the center.

[0010] Preferably, the top-holding plate and the inside of the steel box girder are provided with a moving guide assembly, the moving guide assembly comprises a plurality of evenly distributed limiting grooves formed on the surface of the top-holding plate and limiting plates fixed in the inside of the first steel box girder and the second steel box girder; the limiting plates are perpendicular to the moving direction of the top-holding plate, and the limiting plates are inserted into the limiting grooves and can slide along the grooves.

[0011] Preferably, the interior of the first and second steel box girder is provided with a receiving limiting assembly, which comprises a set of stress plates, the set of stress plates is composed of two plate bodies and is respectively located on both sides of the top holding plate; the distance between the stress plate and the support beam is less than the distance between the top holding plate and the support beam, and after the top holding plate is retracted into the steel box girder, the end portion of the top holding plate can be held on the end portion of the two stress plates.

[0012] Preferably, in the receiving limiting assembly, the end portions of the top holding plate and the stress plate are arc-shaped, which facilitates the sliding of the top holding plate to the end portions of the two stress plates and realizes stable holding.

[0013] Compared with the prior art, the beneficial effects of the present application are: The present application can precisely control the gap between the two steel box girders through the telescopic rod and the threaded transmission structure of the nut and the screw rod, avoid pores, slag and other defects caused by the gap during welding, significantly improve the weld strength and connection reliability, and meet the high requirements of the bridge on structural safety.

[0014] In addition, after assembly, the top holding plate, the stress plate and the support beam form a triangular support structure, which disperses the load at the splicing part to the main body of the steel box girder, avoiding the concentration of load at the weld; at the same time, the assembly is locked and received through the fixed plate and the fixed groove, forming an auxiliary reinforcing structure, prolonging the service life of the bridge. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 : The overall structure of the assembled steel box girder of the present application is shown in the figure; Figure 2 : The through groove and fixed groove on the surface of the first steel box girder of the present application are shown in the figure; Figure 3 : The nut, telescopic rod, L-shaped rod, pull ring and fixed plate cooperation structure of the present application are shown in the figure; Figure 4 : The internal structure of the steel box girder of the present application is shown in the figure; Figure 5 : The structure at position A in the figure is shown in the enlarged view. Figure 4

[0016] In the figure: first steel box girder 1, second steel box girder 2, screw rod 3, telescopic rod 4, through groove 5, fixed groove 6, nut 7, L-shaped rod 8, pull ring 9, fixed plate 10, support beam 11, elastic plate 12, top holding plate 13, limiting plate 14, telescopic arm 16, cross bar 17, limiting groove 18, stress plate 19, arc-shaped plate 20. DETAILED DESCRIPTION

[0017] ​In order to clearly and completely set forth the objects, technical solutions and advantages of the present application, the embodiments of the present application are further described in detail below with reference to the drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present application, rather than all the embodiments, and are only used to explain the embodiments of the present application, and do not limit the embodiments of the present application. All other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0018] Please refer to Figures 1 to 5 The present application provides a technical solution: Embodiment 1:

[0019] The assembled steel box girder of the embodiment includes a first steel box girder 1 and a second steel box girder 2 butt-jointed at the end, and a support beam 11 is fixed inside the first steel box girder 1, which provides stable bearing for all subsequent splicing components, avoiding component deviation caused by foundation shaking during splicing. The surface of the support beam 11 is vertically connected with a cross bar 17, the end of the cross bar 17 is provided with an extension adjustment structure, the extension adjustment structure includes an extension arm 16 inserted into the end of the cross bar 17 and axially slidable along the cross bar 17, and the extension arm 16 can flexibly adjust the extension length.

[0020] The end of the extension arm 16 away from the cross bar 17 is connected with a rectangular plate-shaped top holding plate 13, the surface of the top holding plate 13 is provided with a guide receiving module, the guide receiving module includes an L-shaped rod 8 fixed to the surface of the top holding plate 13, the horizontal section of the L-shaped rod 8 extends to the outside of the steel box girder through a through slot 5 and can move along the through slot 5, driving the top holding plate 13 and the extension arm 16 to move synchronously; the surface of the first steel box girder 1 is provided with a through slot 5 matched with the L-shaped rod 8, which serves as a channel for the L-shaped rod 8 to pass out to the outside of the steel box girder or to be received in the steel box girder.

[0021] The end of the horizontal section of the L-shaped rod 8 is inserted with an extension rod 4, the first steel box girder 1 and the second steel box girder 2 are symmetrical in structure, and the ends of the extension rods 4 of the two are provided with matched butt-joint locking structures, the butt-joint locking structure includes a rotatable nut 7 sleeved on the end of the extension rod 4 on the side of the first steel box girder 1, and a screw rod 3 fixed to the end of the extension rod 4 on the side of the second steel box girder 2, the outer diameter of the screw rod 3 is matched with the inner hole diameter of the nut 7, and the screw rod 3 can be screwed into the inside of the nut 7, and the driving butt-joint of the two steel box girders is realized through thread cooperation.

[0022] When assembling, the second steel box girder 2 is hoisted to one side of the end of the first steel box girder 1, and the two steel box girders are initially aligned at the abutting end face. At this time, the L-shaped rod 8 is accommodated in the steel box girder, the telescopic arm 16 in the telescopic adjusting structure is retracted in the cross rod 17, and the telescopic rod 4 is not extracted from the L-shaped rod 8. Then the operator pulls the L-shaped rod 8, drives the top holding plate 13 to move to the edge of the steel box girder, synchronously extracts the telescopic arm 16 from the cross rod 17, until the horizontal section of the L-shaped rod 8 is completely extracted outside the steel box girder, and the telescopic rod 4 is located between the two steel box girders. Then the telescopic rod 4 on the side of the two steel box girders is extracted from the L-shaped rod 8, the screw rod 3 on the side of the second steel box girder 2 is aligned with the nut 7 on the side of the first steel box girder 1, the nut 7 is screwed, the two telescopic rods 4 are driven to approach each other through the threaded transmission of the abutting locking structure, the abutting end face of the two steel box girders is gradually adhered, until the gap is eliminated by tight top holding, then welding is performed, and finally the nut 7 is unscrewed in the reverse direction to separate the screw rod 3 from the nut 7. The telescopic rod 4, the L-shaped rod 8 and the telescopic arm 16 are retracted into the steel box girder, and the assembly is completed.

[0023] Embodiment 2:

[0024] On the basis of embodiment 1, the structure is further optimized to make the assembly more efficient, stable and safe. The first steel box girder 1 and the second steel box girder 2 are provided with a position locking assembly, which includes a fixed groove 6 opened on the surface of the two and a fixed plate 10 fixed on the surface of the L-shaped rod 8. After assembly, the fixed plate 10 can be inserted into the fixed groove 6 and locked by external bolts, which can stably accommodate the assembly in the steel box girder, avoid damage caused by external collision, and keep the surface of the steel box girder smooth, without affecting the subsequent bridge deck paving process.

[0025] The L-shaped rod 8 and the telescopic rod 4 are provided with a anti-disengagement limiting assembly, which includes a pull ring 9 fixed on the surface of the L-shaped rod 8, a first limiting ring arranged at one end of the telescopic rod 4 inside the L-shaped rod 8, and a second limiting ring arranged at one end of the telescopic rod 4 inside the nut 7. The operator can easily pull the L-shaped rod 8 by holding the pull ring 9 without the help of additional tools, reducing the operation strength. The first limiting ring can be held in the inner wall of the L-shaped rod 8 to prevent the telescopic rod 4 from completely disengaging and being lost. The second limiting ring can be held in the inner wall of the nut 7 to prevent the nut 7 from falling off the end of the telescopic rod 4, ensuring continuous and stable threaded transmission.

[0026] The first steel box girder 1 and the second steel box girder 2 are internally provided with elastic buffering assemblies, the elastic buffering assemblies comprise two groups of symmetrically distributed elastic plates 12 and arc-shaped plates 20 fixed to the end portions of the elastic plates 12, the two groups of elastic plates 12 are symmetrically centered on the moving track of the supporting plates 13; the supporting plates 13 are supported on the surfaces of the arc-shaped plates 20 after moving, the elastic plates 12 are elastic, so that the supporting plates 13 are clamped between the arc-shaped plates 20, the supporting plates 13 and the L-shaped rods 8 are stabilized, the arc-shaped plates 20 clamp the supporting plates 13, temporary fixing is realized, manual reinforcement by means of clamps, bolts and the like is not needed, and the operation steps are simplified.

[0027] The supporting plates 13 and the steel box girders are internally provided with moving guide assemblies, the moving guide assemblies comprise a plurality of groups of uniformly distributed limiting grooves 18 formed on the surfaces of the supporting plates 13 and limiting plates 14 fixed to the interiors of the first steel box girder 1 and the second steel box girder 2; the limiting plates 14 are perpendicular to the moving direction of the supporting plates 13 and are inserted into the limiting grooves 18 and can slide along the grooves; when the supporting plates 13 move, the limiting plates 14 slide along the limiting grooves 18, a fixed moving track is provided for the supporting plates 13, transverse deviation of the supporting plates 13 is prevented, the L-shaped rods 8 and the telescopic rods 4 can be accurately aligned with the corresponding components of the other steel box girder, and the butt joint accuracy is improved.

[0028] The interiors of the first steel box girder 1 and the second steel box girder 2 are internally provided with accommodating limiting assemblies, the accommodating limiting assemblies comprise a group of stress plates 19, the group of stress plates 19 are composed of two plate bodies and are respectively located on the two sides of the supporting plates 13, and the distance between the stress plates 19 and the supporting beams 11 is less than the distance between the supporting plates 13 and the supporting beams 11; after the supporting plates 13 are withdrawn into the interiors of the steel box girders, the end portions of the supporting plates 13 can be supported on the end portions of the two stress plates 19, and the supporting beams 11 jointly form a triangular stable support structure, the load of the spliced parts is dispersed to the main bodies of the steel box girders, the load is prevented from being concentrated at the welds, and the strength of the steel box girders is further enhanced.

[0029] The optimized assembly process is smoother based on Embodiment 1: the operator pulls the L-shaped rod 8 through the pull ring 9, the holding plate 13 moves with the L-shaped rod 8, the limiting plate 14 in the movement guide assembly slides along the limiting groove 18, the arc-shaped plate 20 in the elastic buffer assembly is extruded by the holding plate 13 to deform the elastic plate 12, and after completely passing through the arc-shaped plate 20, the elastic plate 12 is automatically clamped and fixed; when the telescopic rod 4 is pulled out, the first limiting ring in the anti-disengagement limiting assembly prevents it from disengaging, and when the nut 7 is screwed, the second limiting ring ensures stable transmission of the nut 7; after connection is completed, the arc-shaped plate 20 is pressed to release the clamping, the pull ring 9 is pushed to retract the assembly, and the fixed plate 10 in the position locking assembly is aligned with the fixed groove 6 to lock, at this time, the arc-shaped end of the holding plate 13 is in close contact with the arc-shaped end of the stress plate 19 in the storage limiting assembly to form a stable internal support.

[0030] Working principle:

[0031] The operator pulls the L-shaped rod 8 through the pull ring 9, driving the telescopic arm 16 in the telescopic adjustment structure and the holding plate 13 to move synchronously, the cooperation between the limiting plate 14 in the movement guide assembly and the limiting groove 18 ensures the accuracy of the movement trajectory, and the elastic plate 12 in the elastic buffer assembly and the arc-shaped plate 20 realize automatic temporary fixing of the holding plate 13 through elastic deformation, providing a stable foundation for subsequent butt joint; the telescopic rod 4, the nut 7 and the screw rod 3 in the butt joint locking structure are used for threaded transmission, the nut 7 is screwed to drive the two steel box girders to slowly approach along the axis, the butt joint gap is controlled through high-precision threaded transmission, ensuring that the end faces are closely attached to create conditions for high-quality connection; after assembly is completed, the fixed plate 10 in the position locking assembly is locked with the fixed groove 6 for storage, the arc-shaped end of the holding plate 13 is in close contact with the arc-shaped end of the stress plate 19 in the storage limiting assembly to form a triangular support structure with the supporting beam 11, dispersing the load at the splicing part and improving the overall anti-deformation capability.

[0032] Although the above describes the specific embodiments of the present application in order to enable those skilled in the art to understand the present application, the present application is not limited to the scope of the specific embodiments, and for those skilled in the art, all application creations utilizing the concept of the present application are within the scope of the present application as long as various changes are within the spirit and scope of the present application as defined and determined by the appended claims.

Claims

1. A type of assembled steel box girder, characterized in that: The structure includes a first steel box girder (1) and a second steel box girder (2) with end connections. A support beam (11) is fixed inside the first steel box girder (1). A crossbar (17) is fixed to the surface of the support beam (11). The end of the crossbar (17) is provided with a telescopic adjustment structure. The telescopic adjustment structure includes a telescopic arm (16) inserted into the end of the crossbar (17) and capable of sliding along its axial direction. A top support plate (13) is fixed to the end of the telescopic arm (16). A guide storage module is provided on the surface of the top support plate (13). The guide storage module includes an L-shaped rod (8) fixed to the surface of the top support plate (13). The end of the L-shaped rod (8) is inserted into… The first steel box girder (1) is provided with a through groove (5) that is compatible with the L-shaped rod (8), which serves as a channel for the L-shaped rod (8) to pass through to the outside of the steel box girder or to be stored inside the steel box girder; the first steel box girder (1) and the second steel box girder (2) are symmetrical in structure, and the ends of the telescopic rods (4) of the two are provided with matching docking locking structures. The docking locking structure includes a rotatable nut (7) sleeved on the end of the telescopic rod (4) on the side of the first steel box girder (1), and a screw (3) fixed on the end of the telescopic rod (4) on the side of the second steel box girder (2). The screw (3) can be screwed into the nut (7).

2. The assembled steel box girder according to claim 1, characterized in that: The first steel box girder (1) and the second steel box girder (2) are provided with a position locking assembly. The position locking assembly includes a fixing groove (6) opened on the surface of both and a fixing plate (10) fixed to the surface of the L-shaped rod (8). The L-shaped rod (8) can slide in the through groove (5). The fixing plate (10) moves synchronously with the L-shaped rod (8) and can be inserted into the fixing groove (6). The fixing plate (10) can be locked in the fixing groove (6) by external bolts.

3. The assembled steel box girder according to claim 2, characterized in that: The L-shaped rod (8) and the telescopic rod (4) are provided with an anti-detachment limiting component. The anti-detachment limiting component includes a pull ring (9) fixed to the surface of the L-shaped rod (8), a first limiting ring located at one end of the telescopic rod (4) inside the L-shaped rod (8), and a second limiting ring located at one end of the telescopic rod (4) inside the nut (7). The first limiting ring can abut against the inner wall of the L-shaped rod (8) to prevent the telescopic rod (4) from completely detaching from the L-shaped rod (8), and the second limiting ring abuts against the inner wall of the nut (7) to prevent the nut (7) from falling off the end of the telescopic rod (4).

4. The assembled steel box girder according to claim 1, characterized in that: The first steel box girder (1) and the second steel box girder (2) are provided with an elastic buffer assembly. The elastic buffer assembly includes two sets of symmetrically distributed elastic plates (12) and an arc plate (20) fixed to the end of the elastic plate (12). The two sets of elastic plates (12) are symmetrically distributed with the moving trajectory of the top plate (13) as the center.

5. The assembled steel box girder according to claim 1, characterized in that: The top support plate (13) and the steel box girder are provided with a moving guide assembly. The moving guide assembly includes multiple sets of evenly distributed limiting grooves (18) opened on the surface of the top support plate (13) and a limiting plate (14) fixed inside the first steel box girder (1) and the second steel box girder (2). The limiting plate (14) is perpendicular to the moving direction of the top support plate (13) and is inserted into the limiting groove (18) and can slide along the groove.

6. The assembled steel box girder according to claim 1, characterized in that: The first steel box girder (1) and the second steel box girder (2) are provided with a storage limiting component. The storage limiting component includes a set of force plates (19). The set of force plates (19) consists of two plates and is located on both sides of the top holding plate (13). The distance between the force plate (19) and the support beam (11) is less than the distance between the top holding plate (13) and the support beam (11). After the top holding plate (13) is retracted into the steel box girder, its end can be held against the ends of the two force plates (19).

7. The assembled steel box girder according to claim 6, characterized in that: In the storage limiting assembly, the ends of the top holding plate (13) and the force plate (19) are both arc-shaped, which makes it easy for the top holding plate (13) to slide to the ends of the two force plates (19) and achieve stable support.

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