Section steel telescopic device facilitating bridge body pouring

Abstract

The utility model belongs to the technical field of highway bridge expansion joint devices, and particularly relates to a profile steel expansion device convenient for bridge body pouring, which comprises a bridge body, an expansion mechanism, a cover plate, a connecting piece and a pre-embedded component, the number of the bridge bodies is two, the two bridge bodies are distributed in a clearance mode, the two bridge bodies are each provided with an embedded groove, and an embedded assembly is arranged in each embedded groove. The two cover plates are located above the two pre-buried grooves correspondingly, the telescopic mechanism is arranged between the two cover plates, and the two ends of the telescopic mechanism are connected with the inner side walls of the two cover plates correspondingly; the cover plate is detachably connected with the pre-embedded assembly through a connecting piece; an auxiliary part is arranged at the bottom of the cover plate, the bottom of the auxiliary part can abut against the connecting end, detachably connected with the connecting part, of the embedded assembly, and the connecting part can penetrate through the cover plate and the auxiliary part and is detachably connected with the connecting end of the embedded assembly; a plurality of pouring openings are formed in the cover plate, and cover blocks are detachably connected into the pouring openings. The scheme can shorten the construction period.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of highway bridge expansion joint device, concretely relates to a type steel expansion device convenient for bridge beam body pouring. BACKGROUND

[0002] Bridge as the important component of modern traffic network, its structural integrity and functionality are important to ensure traffic safety, improve driving comfort. With the growth of service life and the increase of traffic flow, bridge deformation will occur under the influence of temperature change, load and other factors, which requires the introduction of effective expansion device in bridge design to adapt to the deformation. Especially for small and medium span bridges, 80 type bridge type steel expansion device is widely used due to its practicability and economy, and the application proportion is expected to exceed 60%. This kind of expansion device is mainly made of type steel material, including C type, F type and E type steel, which provides corresponding bearing capacity according to different cross section shape and area.

[0003] However, the traditional type steel expansion device exposes a series of problems in the actual application process, which seriously affects the safety and service life of the bridge. The destruction of the transition section concrete is one of the common problems, and the vibration caused by vehicle passing causes instantaneous and high frequency impact force on the anchoring system of the expansion device and the transition section concrete, which leads to the separation of the anchoring device and the concrete and finally completely damages.

[0004] The transition section concrete needs to be repaired and replaced after the destruction, but the current repair process needs to completely remove all loose or damaged concrete parts and failed anchoring materials under the condition of closed traffic or traffic control, and then refill the concrete. The existing repair and replacement cycle is long, and frequent repair affects normal traffic operation. Therefore, in the improved device, the type steel expansion device is welded with the cover plate as an assembly unit, and the cover plate is detachably connected with the embedded component embedded in the concrete of the bridge beam body by using the connecting piece, so that the expansion mechanism and the cover plate can be quickly installed and detached on the bridge beam body. In the process of pouring concrete, the connecting piece and the part connected with the connecting piece need to be reserved with the corresponding connecting position by using the pouring formwork, so that the cover plate can be detachably connected with the embedded component through the connecting piece. The installation and removal process of the pouring formwork is complicated and time-consuming, which increases the construction period. UTILITY MODEL CONTENTS

[0005] In order to solve the above technical problems, the utility model provides a type steel expansion device convenient for bridge beam body pouring, which solves the problem of complicated and time-consuming installation and removal process of pouring formwork and increases the construction period.

[0006] The utility model discloses a technical scheme as follows: A type steel telescopic device convenient for bridge girder pouring, including bridge girder, telescopic mechanism, apron, connecting piece and pre -buried subassembly,

[0007] Two bridge girders are provided and are distributed with gaps, two pre -buried grooves are formed in the two bridge girders, a pre -buried subassembly is arranged in the pre -buried groove, and the pre -buried groove is used for pouring concrete,

[0008] Two aprons are arranged above two pre -buried grooves respectively, the telescopic mechanism is arranged between the two aprons, and the two ends of the telescopic mechanism are connected with the inner side walls of the two aprons respectively,

[0009] The apron is detachably connected with the pre -buried subassembly through the connecting piece,

[0010] The apron bottom is provided with an auxiliary part, the auxiliary part bottom can abut on the connecting end of the pre -buried subassembly and the connecting piece detachable connection, the connecting piece can penetrate the apron and the auxiliary part in proper order and is detachably connected with the connecting end of the pre -buried subassembly,

[0011] A plurality of pouring openings are formed in the apron, and a cover block is detachably connected in the pouring opening.

[0012] Further, the pre -buried subassembly includes pre -buried steel bars and U -shaped rods,

[0013] A plurality of pre -buried steel bars are arranged, the pre -buried steel bars are arrayed along the length direction of the bridge girder, a plurality of U -shaped rods are arranged corresponding to the pre -buried steel bars, the pre -buried steel bars are fixedly connected in the pre -buried groove, the U -shaped rods are fixedly connected with the corresponding pre -buried steel bars respectively, the opening of the U -shaped rod faces upwards, and the two ends of the U -shaped rod are fixedly connected with threaded barrels respectively.

[0014] Further, the connecting piece is a bolt, and the auxiliary part is a rib plate,

[0015] A plurality of rib plates are arranged corresponding to the U -shaped rods, the rib plates are arrayed along the length direction of the apron, the rib plate is fixedly installed at the bottom of the apron, the rib plate bottom can abut on the top of the threaded barrel, and the apron and the rib plate are respectively provided with connecting through holes and connecting counterbores corresponding to the threaded barrels.

[0016] Further, the pre -buried subassembly further includes a plurality of reinforcing ribs,

[0017] The reinforcing ribs are fixedly connected on the pre -buried steel bars and the U -shaped rods along the length direction of the bridge girder, and the reinforcing ribs are spaced apart along the width direction of the bridge girder.

[0018] Further, the telescopic mechanism comprises a sealing rubber strip and a side beam profile steel;

[0019] The sealing rubber strip and the side beam profile steel are arranged along the length direction of the bridge beam body, the side beam profile steel is provided with two, the sealing rubber strip is fixedly connected between the two side beam profile steels, and the outer side walls of the two side beam profile steels are fixedly connected with the two cover plates respectively.

[0020] Further, the top of the bridge beam body is further paved with a paving layer, and the paving layer and the inner side wall of the pre-buried groove are provided with a partition plate.

[0021] Further, a plurality of pouring openings are arrayed along the length direction of the bridge beam body, the inner side wall of the pouring opening is provided with an internal thread, the shape of the cover block is matched with the pouring opening, and the cover block is threadedly connected in the pouring opening.

[0022] Further, the top of the cover block is provided with a mounting opening, and a rotating block is fixedly connected in the mounting opening.

[0023] The utility model discloses the beneficial effect of:

[0024] Before pouring concrete into the pre-buried groove of the bridge beam body, the utility model discloses a mode for connecting the telescopic mechanism between two cover plates as an assembly unit, covering the pre-buried groove from above with the cover plate, and after the bottom of the auxiliary part of the cover plate abuts on the connecting end of the pre-buried assembly and the connecting piece detachable connection, the cover plate and the pre-buried assembly are detachably connected through the connecting piece, so that the cover plate and the pre-buried assembly become a reliable whole, and the telescopic mechanism and the cover plate can be quickly installed and disassembled on the bridge beam body in the later period, greatly shorten the maintenance and replacement cycle, reduce the influence on traffic operation, then pour concrete into the pre-buried groove of the bridge beam body, and in the pouring process, the auxiliary part reserves a connecting position for the pre-buried assembly and the connecting piece, after the concrete reaches the expected strength, the pouring opening is covered with the cover block, the pouring formwork required for the detachable connection of the connecting assembly and the pre-buried assembly is avoided, the construction period increased by the installation and disassembly process of the pouring module is avoided, and the cover plate can be quickly installed and disassembled on the bridge beam body in the later period, the construction efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0025] Fig. 1 It is a partial structure schematic view (cover plate assembly state) of the utility model;

[0026] Fig. 2 It is a partial structure schematic view (cover plate disassembly state) of the utility model;

[0027] Fig. 3 It is a partial sectional view of the cover plate and the auxiliary part in the utility model;

[0028] The accompanying drawings are as follows:

[0029] Bridge beam body 1, embedded groove 11, paving layer 12, concrete 13, pouring opening 14, cover block 15, rotating block 16, stay wire groove 17, expansion joint 2, sealing rubber strip 21, side beam profile steel 22, cover plate 3, connecting through hole 31, connecting piece 4, bolt 41, embedded assembly 5, embedded steel bar 51, U-shaped rod 52, threaded cylinder 53, reinforcing rib 54, auxiliary piece 6, rib plate 61, connecting counter bore 62, partition plate 7. DETAILED DESCRIPTION

[0030] The embodiments of the present application will be further described below in conjunction with the drawings and examples. The following examples are used to illustrate the present application, but cannot be used to limit the scope of the present application.

[0031] In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more than two; the orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as limiting the indicated device or element to have a specific orientation, to be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0032] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0033] As shown in Figs. 1-3 A profile steel expansion device convenient for bridge beam pouring, comprising a bridge beam body 1, an expansion joint 2, a cover plate 3, a connecting piece 4 and an embedded assembly 5;

[0034] The bridge beam body 1 is provided with two and is distributed with gaps, two bridge beam bodies 1 are provided with embedded grooves 11, the embedded assembly 5 is arranged in the embedded groove 11, and the embedded groove 11 is used for pouring concrete 13; in this embodiment, the fiber concrete is poured, and the fiber material (such as steel fiber, glass fiber or polypropylene fiber) in the fiber concrete can effectively improve the tensile strength and toughness of the concrete 13, reduce the occurrence and development of cracks, and thus improve the integrity and stability of the bridge structure.

[0035] The cover plate 3 is provided with two and is located above two pre-buried grooves 11, the telescopic mechanism 2 is arranged between the two cover plates 3, and the two ends of the telescopic mechanism 2 are connected with the inner side walls of the two cover plates 3 respectively;

[0036] The cover plate 3 is detachably connected with the pre-buried assembly 5 through the connecting piece 4; specifically, before pouring the concrete 13, the cover body is detachably connected with the pre-buried assembly 5 through the connecting assembly.

[0037] The bottom of the cover plate 3 is provided with an auxiliary piece 6, the bottom of the auxiliary piece 6 can abut against the connecting end of the pre-buried assembly 5 and the connecting piece 4, and the connecting piece 4 can penetrate the cover plate 3 and the auxiliary piece 6 in sequence and be detachably connected with the connecting end of the pre-buried assembly 5;

[0038] A plurality of pouring openings 14 are formed in the cover plate 3, and a cover block 15 is detachably connected in the pouring opening 14.

[0039] As a preferred scheme, the pre-buried assembly 5 comprises a pre-buried steel bar 51 and a U-shaped rod 52;

[0040] The pre-buried steel bar 51 is provided with a plurality of pre-buried steel bars 51 which are arrayed along the length direction of the bridge beam body 1, the U-shaped rod 52 is provided with a plurality of U-shaped rods 52 corresponding to the plurality of pre-buried steel bars 51, the pre-buried steel bar 51 is fixedly connected in the pre-buried groove 11, the plurality of U-shaped rods 52 are fixedly connected with the corresponding pre-buried steel bars 51 respectively, the opening of the U-shaped rod 52 faces upward, and the two ends of the U-shaped rod 52 are fixedly connected with threaded barrels 53 respectively, the cover plate 3 is threadedly connected with the threaded barrels 53 through the connecting piece 4, and specifically, an internal thread hole is formed in the threaded barrel 53. The pre-buried steel bars 51 are arrayed along the length direction of the bridge beam body 1 and are fixed in the pre-buried groove 11, thereby providing basic support for the whole structure, the U-shaped rod 52 of the U-shaped sleeve is welded with the pre-buried steel bars 51 of the bridge beam body 1, thereby enhancing the stability of the whole structure.

[0041] As a preferred solution, the connecting piece 4 is a bolt 41, specifically, the bolt 41 is a hexagonal bolt 41, and the auxiliary piece 6 is a rib plate 61; the rib plate 61 is provided with a plurality of rib plates 61 corresponding to the U-shaped rods 52, the rib plates 61 are arrayed along the length direction of the cover plate 3, the rib plates 61 are fixedly installed on the bottom of the cover plate 3, the bottom of the rib plate 61 can abut against the top of the threaded cylinder 53, the cover plate 3 and the rib plate 61 are respectively provided with a connecting through hole 31 and a connecting counterbore 62 corresponding to the threaded cylinder 53, the connecting through hole 31 is in communication with the connecting blind hole, and the lower end of the bolt 41 penetrates the connecting through hole 31 and the connecting counterbore 62 in sequence and is threadedly connected with the threaded cylinder 53. In this embodiment, when the cover plate 3 is detachably connected to the bridge girder 1, the head of the bolt 41 is located in the connecting through hole 31, and the top of the bolt 41 is lower than the top of the cover plate 3, the head of the bolt 41 is located in the connecting through hole 31, and the top of the bolt 41 is lower than the top of the cover plate 3, which ensures the surface to be flat and does not affect driving, the connecting through hole 31 allows the head of the bolt 41 to be completely embedded therein, and the connecting counterbore 62 provides a deeper space for the bolt 41, so that the bolt 41 can pass through and be firmly connected with the threaded cylinder 53 below, the cover plate 3 is threadedly connected with the threaded cylinder 53 on the U-shaped rod 52 through the hexagonal bolt 41, so that the cover plate 3 can be stably installed above the bridge girder 1, while allowing quick disassembly and reinstallation when needed, facilitating later maintenance and replacement. By arranging the rib plate 61 on the bottom of the cover plate 3, the rib plate 61 can abut against the top of the connecting end (threaded cylinder 53) of the embedded assembly 5 when pouring the concrete 13, preventing the concrete 13 from seeping into the threaded hole, cooperating with the use of the pouring opening 14, before pouring the concrete 13, the cover plate 3 and the threaded cylinder 53 are connected by the bolt 41, and then the embedded groove 11 is poured with the concrete 13 through the pouring opening 14 on the cover plate 3, avoiding the increase of the construction period caused by the installation and removal process of the pouring module, while ensuring that the cover plate 3 can be quickly installed and dismounted on the bridge girder 1 later, improving the construction efficiency.

[0042] In this embodiment, the outer peripheral wall of the bottom of the cover plate 3 and the rib plate 61 is provided with a Teflon coating, the Teflon coating has a very low friction coefficient and almost does not bond with the concrete 13, and is very easy to demold, the cover plate 3 is made of high-strength steel and has high tensile strength and toughness, and is suitable for bearing heavy traffic.

[0043] In addition, the pouring formwork further comprises an isolation formwork arranged between the gaps between the two bridge girders, and the isolation formwork arranged between the gaps between the two bridge girders is arranged when the concrete is poured, so that the concrete does not flow into the gaps when pouring, thereby ensuring that a gap can be formed between the two bridge girders.

[0044] As a preferred solution, the embedded assembly 5 further comprises a plurality of reinforcing ribs 54;

[0045] A plurality of the reinforcing bars 54 are fixedly connected to the embedded steel bars 51 and the U-shaped bars 52 along the length direction of the bridge beam body 1, and the plurality of the reinforcing bars 54 are spaced apart along the width direction of the bridge beam body 1. In the embodiment, the embedded steel bar 51 is in an inverted U-shaped structure, the opening of the embedded steel bar 51 faces downward, the lower end of the embedded steel bar 51 penetrates into the bridge beam body 1 downward and is fixedly connected in the bridge beam body 1, the upper part of the embedded steel bar 51 is welded to the lower part of the U-shaped bar 52, the reinforcing bar 54 is provided with four, two of which are fixedly connected to the outer side walls of the embedded steel bar 51 and the U-shaped bar 52, and the other two are fixedly connected to the top of the embedded steel bar 51 and the inner bottom wall of the U-shaped bar 52, and play a reinforcing and supporting role on the plurality of arrayed embedded steel bars 51 and U-shaped bars 52. By fixedly connecting the reinforcing bars 54 between the embedded steel bars 51 and the U-shaped bars 52, the rigidity and strength of the overall structure are enhanced, for the bridge expansion device subjected to high-frequency vibration and impact force, this design can effectively disperse stress and reduce damage caused by local stress concentration, and the load generated when the vehicle passes through the bridge can be more evenly distributed to the bridge beam body 1 through the reinforcing bars 54, reducing the risk of single-point overload.

[0046] As a preferred solution, the expansion mechanism 2 comprises a sealing rubber strip 21 and a side beam steel 22;

[0047] The sealing rubber strip 21 and the side beam steel 22 are arranged along the length direction of the bridge beam body 1, the side beam steel 22 is provided with two, the sealing rubber strip 21 is fixedly connected between the two side beam steels 22, and the outer side walls of the two side beam steels 22 are fixedly connected with the cover plates 3 on both sides. The beam steel not only provides rigid support for the entire expansion device, but also can bear the vehicle load and effectively transmit these loads to the lower structure, the combination of the side beam steel 22 and the sealing rubber strip 21 forms an expansion system, which not only ensures the safety and stability of the bridge structure, but also meets the expansion demand of the bridge caused by environmental factors, when the bridge expands or shrinks due to heat or cold, the side beam steel 22 allows a certain degree of relative movement, and the sealing rubber strip 21 maintains good sealing performance to prevent external substances from entering.

[0048] As a preferred solution, the top of the bridge beam body 1 is also paved with a pavement layer 12, and the pavement layer 12 and the inner side wall of the embedded groove 11 are provided with a partition plate 7. Specifically, the inner side wall of the partition plate 7 is provided with a plurality of anchor bolts arranged along the length direction of the embedded groove 11, and the anchor bolts increase the bonding force between the partition plate 7 and the concrete 13. In this embodiment, the pavement layer 12 is an asphalt pavement layer 12, and the partition plate 7 is arranged in advance before the concrete 13 is poured to protect the isolation effect between the asphalt pavement layer 12 and the concrete 13, thereby avoiding problems such as sinking of the partition plate caused by the lower concrete 13 not being vibrated compactly, and the partition plate 7 also has a waterproof effect, preventing water from penetrating into the embedded groove 11, and preventing rusting of the steel bars.

[0049] As a preferred solution, a plurality of pouring openings 14 are arranged along the length direction of the bridge beam body 1, the inner side wall of the pouring opening 14 is provided with an internal thread, the cover block 15 is shaped to match the pouring opening 14, and the cover block 15 is threadedly connected in the pouring opening 14. The top of the cover block 15 is provided with a mounting opening, and the mounting opening is fixedly connected with a rotating block 16. The cover block 15 is threadedly connected in the pouring opening 14, the cover block 15 is removed when the concrete 13 is poured into the embedded groove 11, which facilitates pouring, and the pouring opening 14 is sealed by the cover block 15 after pouring is completed. The threaded connection between the cover block 15 and the pouring opening 14 provides good sealing performance, prevents water and other impurities from entering the embedded groove 11, thereby prolonging the service life of the entire expansion joint device, and in addition, the cover block 15 can be quickly rotated by rotating the rotating block 16, thereby achieving convenient disassembly of the cover block 15 and the pouring opening 14.

[0050] In other embodiments of the present application, the cover plate 3 can also be clamped on the pouring opening 14 to achieve faster disassembly and facilitate pouring.

[0051] As a preferred solution, the upper surface of the cover plate 3 is provided with a plurality of pull line grooves 17 arranged along the width direction of the cover plate 3, and the plurality of pull line grooves 17 are arranged along the length direction of the cover plate 3. In this embodiment, the plurality of pull line grooves 17 are arranged along the length direction of the cover plate 3 and penetrate through both ends of the cover plate 3. By providing the pull line grooves 17, rainwater or other liquids can be quickly discharged along the direction of the grooves, thereby avoiding water accumulation, especially during heavy rain or snowmelt. This design can effectively prevent water from remaining on the surface of the cover plate 3, thereby reducing the impact on the bridge structure and driving safety. In addition, by providing a plurality of arrayed pull line grooves 17, the friction is improved, which provides better grip for vehicles passing through the expansion joint, especially when vehicles suddenly brake while driving on the expansion joint under wet and slippery conditions (such as rainy days, snowy weather), which can significantly improve the safety and stability of driving.

[0052] The working mode of the present application is as follows:

[0053] In use, the asphalt paving layer 12 is isolated and protected by the partition plate 7 before the concrete 13 is poured, and after the embedded steel bars 51, the U-shaped rods 52, the threaded barrels 53 and the reinforcing bars 54 in the embedded groove 11 are welded, the cover plate 3 is arranged above the embedded groove 11, so that the bottom of the rib plate 61 at the bottom of the cover plate 3 abuts against the top of the threaded barrel 53, the lower end of the bolt 41 is sequentially threaded through the cover plate 3 and the rib plate 61 and is screwed with the internal threaded hole of the threaded barrel 53, the internal threaded hole of the threaded barrel 53 is plugged, the cover plate 3 with the telescopic mechanism 2 is screwed with the threaded barrel 53 of the embedded assembly 5, the cover body and the threaded barrel 53 become a reliable whole, the telescopic mechanism 2 and the cover plate 3 can be quickly installed and dismounted on the road surface in the later period, then the cover block 15 on the pouring opening 14 is removed, the embedded groove 11 is poured with the concrete 13 through the pouring opening 14 on the cover plate 3, and the concrete 13 is ensured to be uniformly and densely filled, in the pouring process, the rib plate 61 effectively prevents the concrete 13 from seeping into the threaded hole, after the concrete 13 reaches the expected strength, the pouring opening 14 is covered by the cover block 15, the pouring formwork required for the detachable connection of the connecting assembly and the embedded assembly 5 is avoided, the construction period increased due to the installation and removal of the pouring formwork is avoided, and the cover plate 3 can be quickly installed and dismounted on the bridge beam body 1 in the later period, and the construction efficiency is improved.

[0054] The utility model is described in detail above. The description of the specific embodiment is only used for helping understanding the method and the core idea of the utility model. It should be pointed out that, for ordinary skilled persons in the technical field, some improvements and modifications can be made to the utility model without departing from the principle of the utility model, and the improvements and modifications also fall within the protection scope of the utility model claim.

Claims

1. A type steel telescopic device for facilitating bridge girder pouring, characterized in that: It comprises a bridge beam body (1), an expansion mechanism (2), a cover plate (3), a connecting piece (4) and a pre-buried assembly (5); The bridge beam body (1) is provided with two gap distribution, two bridge beam body (1) are provided with pre-buried groove (11), pre-buried groove (11) is provided with pre-buried assembly (5), pre-buried groove (11) is used for pouring concrete (13) in; The cover plate (3) is provided with two and is respectively located above two pre-buried grooves (11), the expansion mechanism (2) is arranged between two cover plates (3), and the two ends of the expansion mechanism (2) are respectively connected with the inner side walls of two cover plates (3); The cover plate (3) is detachably connected with the pre-buried assembly (5) through the connecting piece (4); The bottom of the cover plate (3) is provided with an auxiliary part (6), the bottom of the auxiliary part (6) can abut against the detachable connection end of the pre-buried assembly (5) and the connecting piece (4), and the connecting piece (4) can pass through the cover plate (3) and the auxiliary part (6) in sequence and be detachably connected with the connection end of the pre-buried assembly (5); A plurality of pouring openings (14) are formed in the cover plate (3), and the pouring openings (14) are detachably connected with cover blocks (15).

2. The telescopic device for facilitating the pouring of a bridge deck according to claim 1, characterized in that: The pre-buried assembly (5) comprises a pre-buried steel bar (51) and a U-shaped rod (52); The pre-buried steel bar (51) is provided with a plurality of pre-buried steel bars (51) which are arrayed along the length direction of the bridge beam body (1), the U-shaped rod (52) is provided with a plurality of U-shaped rods (52) corresponding to the plurality of pre-buried steel bars (51), the pre-buried steel bar (51) is fixedly connected in the pre-buried groove (11), the plurality of U-shaped rods (52) are respectively fixedly connected with the corresponding pre-buried steel bars (51), the opening of the U-shaped rod (52) faces upward, and the two ends of the U-shaped rod (52) are respectively fixedly connected with threaded barrels (53), and the cover plate (3) is threadedly connected with the threaded barrels (53) through the connecting piece (4).

3. The telescopic device according to claim 2, characterized in that: The connecting piece (4) is a bolt (41), and the auxiliary part (6) is a rib plate (61); The rib plate (61) is provided with a plurality of rib plates (61) corresponding to the plurality of U-shaped rods (52), and the plurality of rib plates (61) are arrayed along the length direction of the cover plate (3), the rib plate (61) is fixedly installed at the bottom of the cover plate (3), the bottom of the rib plate (61) can abut against the top of the threaded barrel (53), and the cover plate (3) and the rib plate (61) are respectively provided with a connecting through hole (31) and a connecting blind hole (62) corresponding to the threaded barrel (53), the connecting through hole (31) is communicated with the connecting blind hole, and the lower end of the bolt (41) penetrates the connecting through hole (31) and the connecting blind hole (62) in sequence and is threadedly connected with the threaded barrel (53).

4. The telescopic device according to claim 2, characterized in that: The pre-buried assembly (5) further comprises a plurality of reinforcing ribs (54); The plurality of reinforcing ribs (54) are fixedly connected on the pre-buried steel bars (51) and the U-shaped rods (52) along the length direction of the bridge beam body (1), and the plurality of reinforcing ribs (54) are spaced apart along the width direction of the bridge beam body (1).

5. The telescopic device according to claim 1, characterized in that: The expansion mechanism (2) comprises a sealing rubber strip (21) and an edge beam type steel (22). The sealing rubber strip (21) and the edge beam section steel (22) are arranged along the length direction of the bridge beam body (1), the edge beam section steel (22) is provided with two, the sealing rubber strip (21) is fixedly connected between the two edge beam section steels (22), and the outer side walls of the two edge beam section steels (22) are fixedly connected with the cover plates (3) on the two sides respectively.

6. The telescopic device for facilitating the pouring of a bridge deck according to claim 1, characterized in that: The top of the bridge beam body (1) is further paved with a paving layer (12), and the paving layer (12) and the inner side wall of the embedded groove (11) are provided with a partition plate (7).

7. The telescopic device according to claim 1, characterized in that: A plurality of pouring openings (14) are arrayed along the length direction of the bridge beam body (1), the inner side wall of the pouring opening (14) is provided with an internal thread, the cover block (15) is matched with the pouring opening (14) in shape, and the cover block (15) is threadedly connected in the pouring opening (14).

8. The telescopic device according to claim 7, characterized in that: The cover block (15) is provided with a mounting opening in the top, and a rotating block (16) is fixedly connected in the mounting opening.

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