Highway bridge reconstruction and extension hollow slab jacking reverse slope adjustment splicing structure

Abstract

The utility model relates to a highway bridge reconstruction and expansion hollow slab jacking reverse slope adjusting splicing structure. The highway bridge reconstruction and expansion hollow slab jacking reverse slope adjusting splicing structure comprises a hollow slab, a wet joint easily-disassembled hanging formwork, an opposite-pulling type steel reinforcing temporary splicing frame, an external prestress pull rod overall reinforcing structure and a clamping type height-adjustable temporary shelving support. An integral type steel frame or a synchronous jacking steel pipe support for preventing the jack from moving is arranged at the bottom of the hollow plate. The clamping type height-adjustable temporary shelving support has the advantages that the overall gradient of the hollow slabs is adjusted through the clamping type height-adjustable temporary shelving support, the widened and spliced hollow slabs are fixed through the hinge joint damage preventing device, and the construction efficiency and the jacking safety are improved; according to the external prestressing pull rod integral reinforcing structure, the spliced hollow slabs are integrally pulled and fixed, the process of tensioning the tensile members one by one is omitted, assembly and disassembly are convenient, and the construction efficiency is greatly improved.

Description

Technical Field

[0001] The utility model relates to the field of civil engineering, and in particular comprises a hollow slab jacking and reverse slope adjustment splicing structure for reconstruction and expansion of highway bridges. Background Art

[0002] The hollow slab jacking and reverse slope adjustment splicing structure for highway bridge reconstruction and expansion is a common technical solution in highway bridge reconstruction and expansion projects. This solution realizes the reconstruction and expansion of bridges by jacking and reverse slope adjustment splicing of existing bridges with hollow slabs, thereby improving the traffic capacity and safety of bridges. At present, this technical solution has been applied in some projects and has achieved certain results.

[0003] However, there are still some problems to be solved in the current research. First, the construction technology and process flow are not mature enough. Due to the complexity of the hollow slab jacking and reverse slope adjustment splicing structure of highway bridge reconstruction and expansion, there are some technical difficulties and challenges in the construction process, which need further research and practical summary. Secondly, the construction cost is relatively high. The construction of hollow slab jacking and reverse slope adjustment splicing requires large-scale equipment and high technical level, resulting in high construction costs, which brings certain pressure to the project cost. In addition, there are certain safety risks in the construction process. Since the construction work is carried out on the bridge, there are safety hazards such as high-altitude work and heavy lifting, and it is necessary to strengthen construction safety management and technical guarantees.

[0004] In summary, in order to further promote the development and application of the hollow slab jacking and reverse slope adjustment splicing structure for highway bridge reconstruction and expansion, it is necessary to strengthen relevant research and technical breakthroughs to obtain a new hollow slab jacking and reverse slope adjustment splicing structure for highway bridge reconstruction and expansion to solve the above problems. Utility Model Content

[0005] The utility model aims to overcome the deficiencies in the prior art and provide a hollow slab jacking and reverse slope adjustment splicing structure for reconstruction and expansion of a highway bridge.

[0006] The hollow slab jacking reverse slope adjustment splicing structure for highway bridge reconstruction and expansion comprises: a hollow slab, a wet joint easy-to-remove hanging formwork, a temporary splicing frame reinforced by tensioned steel, an integral reinforcement structure of an external prestressed tie rod, and a clamped height-adjustable temporary shelving bracket; an integral steel frame or a synchronous jacking steel pipe bracket is provided at the bottom of the hollow slab to prevent the jack from shifting;

[0007] The integral steel frame for preventing the jack from shifting includes a jack support; the jack support is arranged on the top of the bridge pier cap beam, and both ends of the jack support are fixed by steel fixing plates. A jack is arranged on the jack support for supporting the hollow slab;

[0008] The external prestressed tie rod integral reinforcement structure is used to integrally reinforce the top and bottom surfaces of the hollow slab by splicing fixed plates and flexible tie rods; vertical perforations are provided on the edges of the hollow slabs for installing wet joints that are easily removable hanging formwork or temporary splicing frames for tension steel reinforcement on adjacent hollow slabs; a clamped, height-adjustable temporary shelving bracket is fixed at one end of the pier cap beam and supported underneath the hollow slab with reverse slope adjustment.

[0009] Preferably, the integral steel frame for preventing the jack from shifting comprises a steel fixing plate, a jack support, a steel pad and a jack; the steel fixing plate is fixed to the side of the pier cap beam, a plug hole is provided on the side of the steel fixing plate, and a shelf groove is provided on the top of the steel fixing plate facing the pier cap beam; the jack supports are evenly arranged on the top of the pier cap beam, a positioning hole is provided on the top of the jack support, the jack is placed in the positioning hole, and tooth plates are respectively provided on the ends of both sides of the jack support; the steel pad is located at the top of the jack below the hollow plate at the joint, and the tooth plate is placed in the shelf groove; the steel fixing plate is fixed to the side of the pier cap beam by nuts and screws, and a cap beam reserved hole is provided on the side of the pier cap beam, and the screw passes through the plug hole and the cap beam reserved hole in turn and is fixed with a nut.

[0010] Preferably, the synchronous lifting steel pipe support includes a base, a steel plate, a lifting jack, a construction platform, a diagonal brace, a vertical steel pipe, a longitudinal steel pipe, a diagonal steel pipe, a roller, a transverse steel pipe, a track slide, a brake clamp, a rotating shaft fixing plate and a rotating shaft; the vertical steel pipes are connected by longitudinal steel pipes and transverse steel pipes, diagonal steel pipes are arranged between the longitudinal steel pipes, and diagonal braces are arranged between the transverse steel pipes to form the overall skeleton of the synchronous lifting steel pipe support; the top of the vertical steel pipe is provided with a construction platform, and the bottom of the vertical steel pipe is provided with a roller; the lifting jack The top is set on the top of the construction platform, and the lifting jack is supported under the part of the hollow slab extending beyond the pier cap beam; a reserved hole is set on the construction platform, and the vertical steel pipe is fixed with bolts after passing through the reserved hole of the construction platform, and a rotating shaft fixing plate is set at the bottom of the vertical steel pipe, a brake clamp and a rotating shaft are set below the rotating shaft fixing plate, and a roller is set below the rotating shaft, and the roller is placed in the track slide groove; bases are evenly distributed on the top of the construction platform, and lifting jacks are set on the top of the base, and steel plates are set on the top of the lifting jacks below the hollow slab at the joint.

[0011] Preferably, the wet joint easily disassembled hanging formwork is used for the wet joint connection construction between hollow slabs, and the wet joint easily disassembled hanging formwork comprises grouting holes, tie rods, fastening nuts, suspension ropes, hanging parts, bottom formwork and top formwork; the top formwork and the bottom formwork are respectively located at the top and bottom of the hollow slab at the joint, a tie rod is provided in the center of the top of the bottom formwork, and suspension ropes are symmetrically provided on the top of the bottom formwork on both sides of the tie rod; the suspension ropes pass through the through holes of the hollow slab, and the suspension ropes are fixed to the top formwork through the hanging parts; the tie rods are fixed to the fastening nuts through fastening nuts, and the top formwork is provided with grouting holes.

[0012] Preferably, the temporary splicing frame reinforced with tension steel is used for temporary fixation when hollow slabs are spliced, and the temporary splicing frame reinforced with tension steel comprises a top tension plate, a bottom tension plate, fixing bolts and tension rods; the top tension plate and the bottom tension plate are respectively located at the top and bottom of the hollow slab joint, and the tension rods pass through the bottom tension plate, the through hole and the top tension plate in sequence, and are fixed with fixing bolts.

[0013] Preferably, the bottom of the hollow slab is provided with a bottom drilled hole, and the top of the hollow slab is provided with a top drilled hole; the external prestressed tie rod integral reinforcement structure is used to reinforce the hollow slab during the jacking process, and the external prestressed tie rod integral reinforcement structure includes a flexible tie rod, a top fixed steel plate, a sleeve, a top fixed end plate, a bottom fixed end plate, a reserved hole, a threaded plug-in and a bottom fixed steel plate; the bottom of the top fixed steel plate and the top fixed end plate are provided with a threaded plug-in, and the top of the bottom fixed end plate and the bottom fixed steel plate are provided with a threaded plug-in; the top fixed end plate and the bottom fixed end plate are provided with a threaded plug-in A sleeve is provided on the inner side of the fixed end plate, and reserved holes are penetrated through the sides of the top fixed steel plate and the bottom fixed steel plate. The top fixed end plate and the bottom fixed end plate are fixed to the top and bottom of the hollow plate located at the end, and the top fixed steel plate and the bottom fixed steel plate are fixed to the top and bottom of the hollow plate on the inner side of the end; the threaded plug-ins of the top fixed steel plate and the top fixed end plate are inserted into the top drilled hole, and the threaded plug-ins of the bottom fixed end plate and the bottom fixed steel plate are inserted into the bottom drilled hole; the flexible pull rod passes through the top fixed steel plate and is connected to the sleeves at both ends.

[0014] Preferably, the clamped height-adjustable temporary shelving bracket is used for multi-point synchronous jacking of hollow slabs for reverse slope adjustment construction, and the clamped height-adjustable temporary shelving bracket comprises a clamping slot, a height-adjustable temporary shelving bracket base, a support plate, an adjustment jack and a jacking rod; a clamping slot is provided at the bottom of the height-adjustable temporary shelving bracket base, a shock-proof block is provided at the end of the pier cap beam, and the top of the shock-proof block at one end of the pier cap beam is supported in the clamping slot, an adjustment jack is provided at the top of the height-adjustable temporary shelving bracket base, a jacking rod is provided at the top of the adjustment jack, and a support plate is provided at the top of the jacking rod; one end of the hollow slab jacking is widened and spliced ​​with a hollow slab through a bottom plate, a fixing nut, a tightening rod and a top plate; a tightening rod is provided at the top of the bottom plate, the tightening rod passes through the through-hole of the hollow slab and is fixed to the top plate with a fixing nut.

[0015] The beneficial effects of the utility model are:

[0016] 1) The utility model utilizes a clamped height-adjustable temporary shelving bracket to adjust the overall slope of the hollow slab, and utilizes a device to prevent hinged seam damage to fix the widened and spliced ​​hollow slab, thereby improving construction efficiency and jacking safety, reducing construction difficulty and construction cost, and having broad prospects for promotion and application.

[0017] 2) The utility model adopts an external prestressed tie rod integral reinforcement structure to tighten the spliced ​​hollow slabs as a whole, eliminating the process of tensioning the tensile members one by one, making assembly and disassembly convenient and greatly improving the construction efficiency; at the same time, the pre-arch degree of the slab beam can be conveniently controlled to ensure that the pre-arch degree loss of the slab beam after reinforcement is small, thereby improving the bearing capacity of the hollow slab beam.

[0018] 3) The utility model can realize temporary reinforcement of the hollow slabs by tensioning and fixing the adjacent hollow slabs through the tension steel reinforcement temporary splicing frame, thereby ensuring the construction safety of the hollow slabs during the jacking process.

[0019] 4) The utility model uses a wet joint easily detachable hanging formwork to cast the wet joint of the hollow slab bracket. The structure is exquisite. The bottom formwork and the top formwork are fixed and tied by a hanging combination. The assembly and disassembly are convenient, and the construction efficiency is improved while ensuring the construction quality of the wet joint.

[0020] 5) The utility model directly sets an integral steel frame on the pier cap beam to prevent the jack from shifting to lift the hollow slab without a bracket. The structural design is simple, which ensures uninterrupted traffic construction, maximizes traffic safety, avoids waste of resources, and has significant social and economic benefits. The hollow slab steel pipe bracket can also be synchronously lifted by synchronously lifting the steel pipe bracket, and the bottom of the synchronously lifted steel pipe bracket moves along the track slide to facilitate horizontal removal from under the hollow slab after the construction is completed. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional schematic diagram of the hollow slab jacking reverse slope adjustment splicing structure for highway bridge reconstruction and expansion;

[0022] Figure 2 It is a three-dimensional schematic diagram of the construction of an integral steel frame to prevent the jack from shifting;

[0023] Figure 3 It is a three-dimensional schematic diagram of the construction of the pier cap beam structure;

[0024] Figure 4 It is a three-dimensional schematic diagram of the construction of the jack support structure;

[0025] Figure 5 It is a three-dimensional schematic diagram of the construction of the steel fixed plate structure;

[0026] Figure 6 It is a three-dimensional schematic diagram of the construction of hollow slab synchronous jacking steel pipe support;

[0027] Figure 7 It is a three-dimensional schematic diagram of the horizontal displacement and placement construction of the track under the steel tube lattice support bridge;

[0028] Figure 8 It is a three-dimensional schematic diagram of the steel tube lattice support structure;

[0029] Fig. 9 It is a three-dimensional schematic diagram of the construction of wet joint easy-to-remove hanging formwork;

[0030] Fig.10 This is a schematic diagram of the elevation of the wet joint easy-to-remove hanging formwork construction;

[0031] Fig.11 It is a three-dimensional schematic diagram of a temporary splicing frame reinforced with tension steel;

[0032] Fig.12 This is a schematic diagram of the elevation of the temporary splicing frame reinforced with tension steel;

[0033] Fig.13 It is a three-dimensional schematic diagram of the construction of the overall reinforcement structure of the external prestressed tie rod;

[0034] Fig.14 It is a three-dimensional schematic diagram of the construction of the overall reinforcement structure of the external prestressed tie rod;

[0035] Fig.15 It is a three-dimensional schematic diagram of the overall reinforcement structure of the external prestressed tie rod;

[0036] Fig.16 It is a three-dimensional schematic diagram of the bottom structure of the hollow slab;

[0037] Fig.17 It is a three-dimensional schematic diagram of the top structure of the hollow slab;

[0038] Fig.18 It is a three-dimensional schematic diagram of a clamp-on height-adjustable temporary shelf support;

[0039] Fig.19 This is a schematic diagram of the elevation of multi-point synchronous jacking and reverse slope adjustment construction;

[0040] Fig. 20 It is a three-dimensional schematic diagram of multi-point synchronous jacking and reverse slope adjustment construction.

[0041] In the figure: 1- pier column, 2- pier cap beam, 3- anti-vibration block, 4- cap beam reserved hole, 5- support, 6- nut, 7- screw, 8- steel fixing plate, 9- hollow plate, 10- jack support, 11- steel pad, 12- jack, 13- tooth plate, 14- shelf groove, 15- socket, 16- through hole, 17- positioning hole, 18- base, 19- bolt, 20- steel plate, 21- lifting jack, 22- construction platform, 23- diagonal brace, 24- vertical steel pipe, 25- longitudinal steel pipe, 26- inclined steel pipe, 27- roller, 28- transverse steel pipe, 29- track slide, 30- brake card, 31- shaft fixing plate, 32- shaft, 33- grouting hole, 34-tie rod, 35-fastening nut, 36-suspension rope, 37-suspension part, 38-bottom mold, 39-top mold, 40-top tension plate, 41-bottom tension plate, 42-fixing bolt, 43-tie rod, 44-slot, 45-flexible tie rod, 46-top fixed steel plate, 47-sleeve, 48-top fixed end plate, 49-bottom fixed end plate, 50-reserved hole, 51-threaded plug-in, 52-bottom fixed steel plate, 53-bottom drilling hole, 54-top drilling hole, 55-height adjustable temporary shelving bracket base, 56-support plate, 57-adjustment jack, 58-lifting rod, 59-bottom plate, 60-fixing nut, 61-fastening tie rod, 62-top plate. DETAILED DESCRIPTION

[0042] The utility model is further described below in conjunction with the embodiments. The description of the following embodiments is only used to help understand the utility model. It should be pointed out that for ordinary people in this technical field, the utility model can also be modified in some ways without departing from the principle of the utility model, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

[0043] As an example, Figures 1 to 20As shown, the hollow slab jacking reverse slope adjustment splicing structure for reconstruction and expansion of highway bridges includes: pier 1, pier cap beam 2, shockproof block 3, cap beam reserved hole 4, support 5, nut 6, screw 7, steel fixing plate 8, hollow slab 9, jack support 10, steel pad 11, jack 12, tooth plate 13, shelf groove 14, plug hole 15, through hole 16, positioning hole 17, base 18, bolt 19, steel plate 20, jacking jack 21, construction platform 22, diagonal brace 23, vertical steel pipe 24, longitudinal steel pipe 25, inclined steel pipe 26, roller 27, transverse steel pipe 28, track slide 29, brake clamp 30, rotating shaft fixing plate 31, Rotating shaft 32, grouting hole 33, tie rod 34, fastening nut 35, suspension rope 36, suspension part 37, bottom mold 38, top mold 39, top tension plate 40, bottom tension plate 41, fixing bolt 42, tie rod 43, slot 44, flexible tie rod 45, top fixed steel plate 46, sleeve 47, top fixed end plate 48, bottom fixed end plate 49, reserved hole 50, threaded plug-in 51, bottom fixed steel plate 52, bottom drilled hole 53, top drilled hole 54, height-adjustable temporary shelving bracket base 55, support plate 56, adjustment jack 57, lifting rod 58, bottom plate 59, fixing nut 60, fastening tie rod 61, top plate 62.

[0044] The hollow slab jacking and reverse slope adjustment splicing structure for highway bridge reconstruction and expansion includes: an integral steel frame to prevent the jack from shifting, a hollow slab 9 synchronous jacking steel pipe support, an easily removable hanging formwork for wet joints, a temporary splicing frame for reinforcement of tensioned steel, an integral reinforcement structure of external prestressed tie rods and a clamped height-adjustable temporary shelving support; the bottom of the hollow slab 9 is supported by an integral steel frame to prevent the jack from shifting or a synchronous jacking steel pipe support.

[0045] like Fig. 9 and Fig.10 As shown, the wet joint easily disassembled hanging formwork is used for wet joint connection construction between hollow slabs 9, and comprises: grouting holes 33, tie rods 34, fastening nuts 35, suspension ropes 36, suspension parts 37, bottom molds 38, and top molds 39; the top molds 39 and bottom molds 38 are respectively located at the top and bottom of the hollow slabs 9 at the joints, a tie rod 34 is provided at the center of the top of the bottom mold 38, and suspension ropes 36 are symmetrically provided at the top of the bottom mold 38 on both sides of the tie rod 34; the suspension ropes 36 pass through the through holes 16 of the hollow slab 9, and are then fixed to the top mold 39 by the suspension parts 37; the tie rods 34 are fixed to the fastening nuts 35 by the fastening nuts 35, and the top of the top mold 39 is provided with grouting holes 33;

[0046] like Fig.11 and Fig.12As shown, the said tension steel reinforcement temporary splicing frame is used for temporary fixation when the hollow slab 9 is spliced, and it comprises: a top tension plate 40, a bottom tension plate 41, fixing bolts 42, and a tension rod 43; the said top tension plate 40 and bottom tension plate 41 are respectively located at the top tension plate 40 and the bottom tension plate 41, and the tension rod 43 passes through the bottom tension plate 41, the through hole 16 of the hollow slab 9, and the top tension plate 40 in sequence, and is fixed with fixing bolts 42;

[0047] like Figures 13 to 17 As shown, the external prestressed tie rod integral reinforcement structure is used to reinforce the hollow slab 9 during the jacking process, and comprises: a flexible tie rod 45, a top fixed steel plate 46, a sleeve 47, a top fixed end plate 48, a bottom fixed end plate 49, a reserved hole 50, a threaded plug-in 51, and a bottom fixed steel plate 52; the top fixed steel plate 46 and the top fixed end plate 48 are provided with a threaded plug-in 51 at the bottom, and the bottom fixed end plate 49 and the bottom fixed steel plate 52 are provided with a threaded plug-in 51 at the top; the top fixed end plate 48 and the bottom fixed end plate 49 are provided with a threaded plug-in 51 at the top. 9 is provided with a sleeve 47 on the inner side surface, and the sides of the top fixed steel plate 46 and the bottom fixed steel plate 52 are provided with reserved holes 50; the bottom of the hollow plate 9 is provided with a bottom drill hole 53, and the top of the hollow plate 9 is provided with a top drill hole 54; the threaded plug-in 51 of the top fixed steel plate 46 and the top fixed end plate 48 is inserted into the top drill hole 54, and the threaded plug-in 51 of the bottom fixed end plate 49 and the bottom fixed steel plate 52 is inserted into the bottom drill hole 53; the flexible pull rod 45 passes through the top fixed steel plate 46 and is connected to the sleeves 47 at both ends.

[0048] like Figures 18 to 20 As shown, the fixed height-adjustable temporary shelving bracket is used for multi-point synchronous lifting of the hollow slab 9 for reverse slope adjustment construction, and comprises: a slot 44, a height-adjustable temporary shelving bracket base 55, a support plate 56, an adjustment jack 57, and a lifting rod 58; a slot 44 is provided at the bottom of the height-adjustable temporary shelving bracket base 55, and the top of the shockproof block 3 is supported in the slot 44, and an adjustment jack 57 is provided at the top of the height-adjustable temporary shelving bracket base 55, a lifting rod 58 is provided at the top of the adjustment jack 57, and a support plate 56 is provided at the top of the lifting rod 58.

[0049] After the hollow slab 9 is lifted to a certain height, the hollow slab 9 at the widened joint is temporarily spliced ​​by pulling the steel reinforcement using the bottom plate 59, fixing nuts 60, fastening rods 61 and top plate 62 to prevent the hinge joint from being damaged; a fastening rod 61 is provided on the top of the bottom plate 59, the fastening rod 61 passes through the through hole 16 of the hollow slab 9, and then is fixed to the top plate 62 with a fixing nut 60.

[0050] Embodiment 2

[0051] As another embodiment, the second embodiment proposes, on the basis of the first embodiment, a specific structure for preventing the jack from shifting the integral steel frame and the hollow plate 9 to synchronously lift the steel pipe support.

[0052] like Figures 1 to 5 As shown, the integral steel frame to prevent jack displacement is suitable for the construction of hollow slab 9 without support, which includes: steel fixing plate 8, jack support 10, steel pad 11, jack 12; the steel fixing plate 8 is fixed to the side of the bridge pier cap beam 2, and the side thereof is provided with a plug hole 15, and the top of the inner side of the steel fixing plate 8 is provided with a shelf groove 14; the jack support 10 is evenly arranged on the top of the bridge pier cap beam 2, and the top thereof is provided with a positioning hole 17, and the jack 12 It is placed in the positioning hole 17, and tooth plates 13 are respectively provided at the two side ends of the jack support 10; the steel pad 11 is located on the top of the jack 12 below the hollow plate 9 at the joint, and the tooth plate 13 is placed in the placement groove 14; the steel fixing plate 8 is fixed to the side of the pier cap beam 2 by nuts 6 and screws 7. Specifically, a cap beam reserved hole 4 is provided on the side of the pier cap beam 2, and the screw 7 passes through the insertion hole 15 and the cap beam reserved hole 4 in turn, and then is implemented with the nut 6.

[0053] like Figures 6 to 8 As shown, the hollow slab 9 synchronous jacking steel pipe support is suitable for erecting a support to jack up the hollow slab 9 for construction, which comprises: a base 18, a steel plate 20, a jacking jack 21, a construction platform 22, a diagonal brace 23, a vertical steel pipe 24, a longitudinal steel pipe 25, a diagonal steel pipe 26, a roller 27, a transverse steel pipe 28, a brake clamp 30, a rotating shaft fixing plate 31, and a rotating shaft 32; the diagonal brace 23, the vertical steel pipe 24, the longitudinal steel pipe 25, the diagonal steel pipe 26, the roller 27, and the transverse steel pipe 28 constitute the overall skeleton of the hollow slab 9 synchronous jacking steel pipe support. Specifically, the vertical steel pipe The tubes 24 are connected by longitudinal steel tubes 25 and transverse steel tubes 28. Diagonal steel tubes 26 are arranged between the longitudinal steel tubes 25, and diagonal braces 23 are arranged between the transverse steel tubes 28. A construction platform 22 is arranged on the top of the vertical steel tube 24, and a roller 27 is arranged on the bottom of the vertical steel tube 24. The vertical steel tube 24 passes through the reserved hole of the construction platform 22 and is fixed with bolts 19. A rotating shaft fixing plate 31 is arranged on the bottom of the vertical steel tube 24, and a brake clamp 30 and a rotating shaft 32 are arranged below the rotating shaft fixing plate 31. A roller 27 is arranged below the rotating shaft 32, and the roller 27 is placed in the track slide 29. Bases 18 are evenly arranged on the top of the construction platform 22, and a jacking jack 21 is arranged on the top of the base 18. A steel plate 20 is arranged on the top of the jacking jack 21 below the hollow plate 9 at the joint.

Claims

1. A hollow slab jacking reverse slope adjustment splicing structure for highway bridge reconstruction and expansion, characterized in that: include: Hollow slab, wet joint easy-to-remove hanging formwork, temporary splicing frame reinforced by tensioned steel, overall reinforcement structure of external prestressed tie rods and temporary shelving bracket with adjustable height; the bottom of the hollow slab is equipped with an integral steel frame or synchronous jacking steel pipe bracket to prevent the jack from shifting; The integral steel frame for preventing the jack from shifting includes a jack support; the jack support is arranged on the top of the bridge pier cap beam, and both ends of the jack support are fixed by steel fixing plates. A jack is arranged on the jack support for supporting the hollow slab; The external prestressed tie rod integral reinforcement structure is used to integrally reinforce the top and bottom surfaces of the hollow slab by splicing fixed plates and flexible tie rods; vertical perforations are provided on the edges of the hollow slabs for installing wet joints that are easily removable hanging formwork or temporary splicing frames for tension steel reinforcement on adjacent hollow slabs; a clamped, height-adjustable temporary shelving bracket is fixed at one end of the pier cap beam and supported underneath the hollow slab with reverse slope adjustment.

2. The hollow slab jacking reverse slope adjustment splicing structure for highway bridge reconstruction and expansion according to claim 1 is characterized by: The integral steel frame for preventing the jack from shifting comprises a steel fixing plate, a jack support, a steel pad and a jack; the steel fixing plate is fixed to the side of the pier cap beam, a plug hole is provided on the side of the steel fixing plate, and a shelf groove is provided on the top of the steel fixing plate facing the pier cap beam; the jack supports are evenly arranged on the top of the pier cap beam, a positioning hole is provided on the top of the jack support, the jack is placed in the positioning hole, and tooth plates are respectively provided on the ends of both sides of the jack support; the steel pad is located at the top of the jack below the hollow plate at the joint, and the tooth plate is placed in the shelf groove; the steel fixing plate is fixed to the side of the pier cap beam by nuts and screws, and a cap beam reserved hole is provided on the side of the pier cap beam, and the screw passes through the plug hole and the cap beam reserved hole in turn and is fixed with a nut.

3. The hollow slab jacking reverse slope adjustment splicing structure for highway bridge reconstruction and expansion according to claim 1 is characterized by: The synchronous lifting steel pipe support includes a base, a steel plate, a lifting jack, a construction platform, a diagonal brace, a vertical steel pipe, a longitudinal steel pipe, a diagonal steel pipe, a roller, a transverse steel pipe, a track slide, a brake clamp, a rotating shaft fixing plate and a rotating shaft; the vertical steel pipes are connected by longitudinal steel pipes and transverse steel pipes, diagonal steel pipes are arranged between the longitudinal steel pipes, and diagonal braces are arranged between the transverse steel pipes to form the overall skeleton of the synchronous lifting steel pipe support; the top of the vertical steel pipe is provided with a construction platform, and the bottom of the vertical steel pipe is provided with a roller; the lifting jack is provided At the top of the construction platform, the jacking jack is supported under the part of the hollow slab extending beyond the pier cap beam; a reserved hole is provided on the construction platform, and the vertical steel pipe is fixed with bolts after passing through the reserved hole of the construction platform, a rotating shaft fixing plate is provided at the bottom of the vertical steel pipe, a brake clamp and a rotating shaft are provided below the rotating shaft fixing plate, a roller is provided below the rotating shaft, and the roller is placed in the track slide groove; bases are evenly distributed on the top of the construction platform, and a jacking jack is provided on the top of the base, and a steel plate is provided on the top of the jacking jack below the hollow slab at the joint.

4. The hollow slab jacking reverse slope adjustment splicing structure for highway bridge reconstruction and expansion according to claim 1 is characterized by: The wet joint easily disassembled hanging formwork is used for the wet joint connection construction between hollow slabs. The wet joint easily disassembled hanging formwork comprises grouting holes, tie rods, fastening nuts, suspension ropes, hanging parts, bottom formwork and top formwork; the top formwork and the bottom formwork are respectively located at the top and bottom of the hollow slab at the joint, a tie rod is provided in the center of the top of the bottom formwork, and suspension ropes are symmetrically provided on the top of the bottom formwork on both sides of the tie rod; the suspension ropes pass through the through holes of the hollow slab, and the suspension ropes are fixed to the top formwork through the hanging parts; the tie rods are fixed to the fastening nuts through the fastening nuts, and the top formwork is provided with grouting holes.

5. The hollow slab jacking reverse slope adjustment splicing structure for highway bridge reconstruction and expansion according to claim 1 is characterized by: The temporary splicing frame reinforced with tension steel is used for temporary fixation when hollow slabs are spliced. The temporary splicing frame reinforced with tension steel includes a top tension plate, a bottom tension plate, fixing bolts and tension rods; the top tension plate and the bottom tension plate are respectively located at the top and bottom of the hollow slab joint, and the tension rods pass through the bottom tension plate, the through hole and the top tension plate in sequence, and are fixed with fixing bolts.

6. The hollow slab jacking reverse slope adjustment splicing structure for highway bridge reconstruction and expansion according to claim 1 is characterized by: The bottom of the hollow slab is provided with a bottom drilled hole, and the top of the hollow slab is provided with a top drilled hole; the external prestressed tie rod integral reinforcement structure is used to reinforce the hollow slab during the jacking process, and the external prestressed tie rod integral reinforcement structure includes a flexible tie rod, a top fixed steel plate, a sleeve, a top fixed end plate, a bottom fixed end plate, a reserved hole, a threaded plug-in and a bottom fixed steel plate; the bottom of the top fixed steel plate and the top fixed end plate are provided with a threaded plug-in, and the top of the bottom fixed end plate and the bottom fixed steel plate are provided with a threaded plug-in; the top fixed end plate and the bottom fixed end plate are provided with a threaded plug-in A sleeve is provided on the inner side of the end plate, and reserved holes are penetrated through the sides of the top fixed steel plate and the bottom fixed steel plate. The top fixed end plate and the bottom fixed end plate are fixed to the top and bottom of the hollow plate located at the end, and the top fixed steel plate and the bottom fixed steel plate are fixed to the top and bottom of the hollow plate on the inner side of the end; the threaded plug-ins of the top fixed steel plate and the top fixed end plate are inserted into the top drilled hole, and the threaded plug-ins of the bottom fixed end plate and the bottom fixed steel plate are inserted into the bottom drilled hole; the flexible pull rod passes through the top fixed steel plate and is connected to the sleeves at both ends.

7. The hollow slab jacking reverse slope adjustment splicing structure for highway bridge reconstruction and expansion according to claim 1 is characterized by: The clamped height-adjustable temporary shelving bracket is used for multi-point synchronous jacking of hollow slabs for reverse slope adjustment construction. The clamped height-adjustable temporary shelving bracket includes a clamping slot, a height-adjustable temporary shelving bracket base, a support plate, an adjustment jack and a jacking rod; a clamping slot is provided at the bottom of the height-adjustable temporary shelving bracket base, a shock-proof block is provided at the end of the pier cap beam, and the top of the shock-proof block at one end of the pier cap beam is supported in the clamping slot, an adjustment jack is provided at the top of the height-adjustable temporary shelving bracket base, a jacking rod is provided at the top of the adjustment jack, and a support plate is provided at the top of the jacking rod; one end of the hollow slab jacking is widened and spliced ​​with a hollow slab through a bottom plate, a fixing nut, a tightening rod and a top plate; a tightening rod is provided at the top of the bottom plate, and the tightening rod passes through the through-hole of the hollow slab and is fixed to the top plate with a fixing nut.

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