Steel-concrete composite beam bridge deck slab continuous construction device and construction method

Abstract

The invention discloses a continuous construction device and method for a steel-concrete composite beam bridge deck slab. The device comprises a suspension support system, a track system, a pulley system, a sliding beam hanging bracket system and a formwork system. The track system is installed on a poured bridge deck of a steel-concrete composite beam, the suspension support system can be installed on the track system and a steel beam of the steel-concrete composite beam in a sliding mode in the bridge direction, the sliding beam hanging bracket system is installed below the suspension support system and the poured bridge deck in a suspended mode, and the tackle system can be installed on the suspension support system in a sliding mode in the bridge direction. And the template system is suspended at the bottom of the suspension bracket system. During construction, space under the bridge does not need to be occupied, construction is efficient, safe and reliable, the cast-in-place construction efficiency of the steel-concrete composite beam bridge deck slab is effectively improved, the construction cost is reduced, and interference to existing facilities is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of bridge engineering, and in particular to a continuous construction device and a construction method for a steel-concrete composite beam bridge deck. Background Art

[0002] With the continuous development of urbanization and transportation infrastructure, steel-concrete composite beam structures are widely used in bridge engineering due to their superior bearing capacity and adaptability to large span requirements. However, the cast-in-place construction of steel-concrete composite beam bridge decks still faces many technical challenges and limitations in actual engineering.

[0003] Existing bridge deck construction support systems, such as traditional scaffolding full-height supports, beam-column supports, triangular cantilever supports formed by welding steel sections, and cantilever beam hangers, generally have problems such as occupying space under the bridge, complex construction, and difficult support removal. These traditional support structures not only require a lot of manpower and material resources, but are also easily restricted by existing lines and terrain, affecting construction efficiency, increasing construction costs and safety hazards, especially in bridge projects across existing roads, rivers or railways.

[0004] In addition, due to the limitations of the support system, the current construction method often makes it difficult to achieve continuous and efficient cast-in-place construction of bridge decks. Especially in the construction of steel-concrete composite beam bridge decks, there is a high dependence on the space under the bridge, and the erection and dismantling of the support is cumbersome, resulting in a prolonged construction period and low efficiency. Summary of the invention

[0005] The present invention aims to solve the deficiencies of the prior art and provides a continuous construction device and method for a steel-concrete composite beam bridge deck, which is a bridge deck support solution that does not require space under the bridge and has efficient construction, safety and reliability, thereby effectively improving the efficiency of cast-in-place construction of steel-concrete composite beam bridge decks, reducing construction costs, and reducing interference with existing facilities.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A continuous construction device for a steel-concrete composite beam bridge deck, comprising a suspension bracket system, a track system, a pulley system, a sliding beam hanger system, and a template system;

[0008] The track system is installed on the cast bridge deck of the steel-concrete composite beam, the suspension support system can be slidably installed on the track system and the steel beam of the steel-concrete composite beam along the direction of the bridge, the sliding beam hanger system is suspended and installed under the suspension support system and the cast bridge deck, the pulley system can be slidably installed on the suspension support system along the direction of the bridge, and the formwork system is suspended and installed at the bottom of the suspension support system.

[0009] The suspension support system includes a main longitudinal beam, a main cross beam, a first column, a second column, a diagonal brace, a first suspension rod system, an outer formwork cross beam, an inner formwork cross beam and a stopper;

[0010] There are two main longitudinal beams, with blocks provided at both ends of the top of the main longitudinal beams, one end of the bottom of the main longitudinal beams can be slidably supported on the track system through the first column, and the other end of the bottom of the main longitudinal beam can be slidably supported on the steel beam through the second column, and a diagonal brace is provided between the second column and the main longitudinal beam; there are several main cross beams perpendicularly intersecting the two main longitudinal beams, each main cross beam is disconnected at the intersection with the main longitudinal beam and welded to the main longitudinal beam; each main cross beam is provided with several first hanger systems, the outer formwork beam is suspended on the first hanger system corresponding to the main cross beam on the outside of the main longitudinal beam, and the inner formwork beam is suspended on the first hanger system corresponding to the main cross beam between the two main longitudinal beams.

[0011] The bottom of the column feet of the first column and the second column are both provided with supporting steel plates, and the bottom of the supporting steel plates is provided with U-shaped polytetrafluoroethylene plates; the bottom of the supporting steel plate of the first column is provided with reinforcing anti-slip steel plates on both sides of the track system, and limiting bolts are arranged on the reinforcing anti-slip steel plates; the supporting steel plate and the U-shaped polytetrafluoroethylene plate of the second column are provided with slots for shear nails to pass through.

[0012] A pull ring is provided on the front side of the second column.

[0013] The outer formwork beam is an L-shaped structure, and the inner formwork beam is an "I"-shaped structure.

[0014] The track system includes track beams, sleepers and reaction frames;

[0015] There are two track beams and they are set on the cast bridge deck. The sleepers are set between the cast bridge deck and the track beam. The reaction frame is composed of a crossbeam and two sets of tension screws. The crossbeam is supported on the track beam. One end of the tension screw passes through the top of the crossbeam and is fixed by a nut, and the other end passes through the bottom of the cast bridge deck and is fixed by a nut.

[0016] The pulley system includes the main frame, pulley beam, working platform, guardrail and ladder;

[0017] The main frame is an N-shaped structure. The bottoms of the vertical columns on both sides of the main frame are connected to the working platform. Guardrails are arranged around the working platform. Ladders are arranged on the inner sides of the vertical columns on both sides of the main frame. The pulley beam is vertically connected to the transverse beam on the top of the main frame. "π"-shaped connecting seats are arranged at both ends of the bottom of the pulley beam. Rollers are arranged between the two side plates of the "π"-shaped connecting seat and the rollers are rotatably installed on the main longitudinal beam. Limit bolts are arranged on the side plates of the "π"-shaped connecting seat, and the limit bolts are clamped under the upper flange plate of the main longitudinal beam.

[0018] The sliding beam hanger system includes a sliding beam, a second hanger system and a lifting ring;

[0019] The upper end of the second hanger system is fixed to the cast bridge deck and the main crossbeam through nuts and spacers, and the lower end of the second hanger system is connected to the lifting ring through nuts. The lifting ring is a rectangular frame structure. Upper limit columns and lower rollers are provided between the two side plates of the lifting ring. Support wheels are provided at both ends of the lower rollers. The sliding beam is slidably installed on the support wheels of the three sets of lifting rings, and the upper limit column is located above the sliding beam.

[0020] The formwork system includes square timber and formwork, which are connected together by nails and are erected on outer formwork beams and inner formwork beams.

[0021] The construction method of the above-mentioned continuous construction device for a steel-concrete composite beam bridge deck comprises the following specific steps:

[0022] S1. Design the device. Based on mechanical analysis, determine the size of each component and the thickness of each steel plate;

[0023] S2. Process and manufacture the various components of the device in the factory and transport them to the construction site after processing;

[0024] S3, assemble the components on the ground according to the system, and then use a truck crane to hoist each system onto the steel beam for fixed assembly;

[0025] S4. Install the formwork system;

[0026] S5. Tie up the steel bars of the bridge deck to be constructed;

[0027] S6. pouring concrete and curing;

[0028] S7. After the concrete of the poured bridge deck reaches the expected strength, the workers go down the ladder of the main frame on the pulley system to the working platform, operate to remove the formwork system and the outer formwork beam under the flange of the poured bridge deck, and lower them together to the sliding beam; the formwork system and the inner formwork beam in the steel beam box are removed by the workers in the box; all the first hanger systems are removed;

[0029] S8. Laying sleepers and track beam segments on the cast bridge deck, the track beam segments are connected into one piece by bolts, and the track beam is fixed by reaction frames;

[0030] S9. Install a reaction tripod and a fall chain in front of the steel beam. Connect the fall chain hook to the pull ring on the second column. Loosen the limit bolt on the foot of the first column. Operate the fall chain to drive the suspension bracket system, the pulley system, the sliding beam hanger system, the formwork system placed on the sliding beam, and the outer formwork crossbeam to move forward together until the predetermined position. Then tighten the limit bolt on the foot of the first column.

[0031] S10, dismantle the fall chain and reaction tripod, and install the first hanger system, the second hanger system, and the formwork system;

[0032] S11, looping step S5 to step S10 until the construction of the bridge decks on all the steel-concrete composite beams is completed;

[0033] S12. Use a truck crane in conjunction with the demolition device to finally carry out the auxiliary construction of the bridge deck.

[0034] The beneficial effects of the present invention are: the present invention does not need to occupy the space under the bridge, the construction is efficient, safe and reliable, and it effectively improves the cast-in-place construction efficiency of the steel-concrete composite beam bridge deck, reduces construction costs, and reduces interference with existing facilities. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A three-dimensional view of an embodiment of the present invention;

[0036] Figure 2 An elevation view with all components of an embodiment of the present invention marked as a whole;

[0037] Figure 3 An elevation view with detailed structural annotations of each component of an embodiment of the present invention;

[0038] Figure 4 It is a cross-sectional view of II of an embodiment of the present invention;

[0039] Figure 5 For the embodiment of the present invention Figure 3 A large sample picture in the figure;

[0040] Figure 6 For the embodiment of the present invention Figure 3 The B large sample picture in the figure;

[0041] Figure 7 A detailed view of the column foot of the second column according to an embodiment of the present invention;

[0042] Figure 8 This is a schematic diagram of step S5 of an embodiment of the present invention;

[0043] Fig. 9 This is a schematic diagram of step S6 of an embodiment of the present invention;

[0044] Fig.10 This is a schematic diagram of step S7 of an embodiment of the present invention;

[0045] Fig.11 This is a schematic diagram of step S8 of an embodiment of the present invention;

[0046] Fig.12 This is a schematic diagram of the suspension support system before moving in step S9 of an embodiment of the present invention;

[0047] Fig.13 This is a schematic diagram of the suspension support system after it is moved in step S9 of an embodiment of the present invention;

[0048] Fig.14 This is a schematic diagram of step S10 in an embodiment of the present invention;

[0049] In the figure:

[0050] 100-suspension support system; 200-track system; 300-pulley system; 400-sliding beam hanger system; 500-formwork system; 600-steel-concrete composite beam;

[0051] 101-main longitudinal beam; 102-main cross beam; 103-first column; 104-second column; 105-diagonal brace; 106-first suspension rod system; 107-external formwork cross beam; 108-inner formwork cross beam; 109-stopper;

[0052] 201-track beam; 202-sleeper; 203-reaction frame;

[0053] 301-main frame; 302-pulley beam; 303-working platform; 304-guardrail; 305-ladder;

[0054] 401-sliding beam; 402-second suspension rod system; 403-lifting ring;

[0055] 501-square timber; 502-template;

[0056] 601-steel beam; 602-cast bridge deck; 603-shear stud;

[0057] The following is a detailed description of the embodiments of the present invention with reference to the accompanying drawings. DETAILED DESCRIPTION

[0058] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The embodiments are only used to explain the present invention and are not used to limit the scope of the present invention. The present invention is described in more detail by way of example with reference to the accompanying drawings in the following paragraphs. The advantages and features of the present invention will become clearer according to the following description. It should be noted that the accompanying drawings are all in a very simplified form and are not in precise proportions, and are only used to facilitate and clearly assist in explaining the purpose of the embodiments of the present invention.

[0059] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a component centered. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a component centered. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a component centered. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0060] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0061] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0062] like Figure 1 , Figure 2 As shown, a continuous construction device for a steel-concrete composite beam bridge deck comprises a suspension support system 100, a track system 200, a pulley system 300, a sliding beam hanger system 400, and a template system 500.

[0063] The track system 200 is installed on the cast bridge deck 602 of the steel-concrete composite beam 600, the suspension support system 100 is installed on the track system 200 and the steel beam 601 of the steel-concrete composite beam 600, the sliding beam hanger system 400 is suspended under the suspension support system 100 and the cast bridge deck 602, the pulley system 300 is installed on the suspension support system 100, and the formwork system 500 is suspended under the suspension support system 100.

[0064] like Figures 3 to 7 As shown, the suspension support system 100 includes a main longitudinal beam 101, a main cross beam 102, a first column 103, a second column 104, a diagonal brace 105, a first hanger system 106, an outer formwork cross beam 107, an inner formwork cross beam 108 and a stopper 109.

[0065] The track system 200 includes a track beam 201 , a sleeper 202 and a reaction frame 203 .

[0066] The pulley system 300 includes a main frame 301 , a pulley beam 302 , a working platform 303 , a guardrail 304 and a ladder 305 .

[0067] The sliding beam hanger system 400 includes a sliding beam 401 , a second hanger rod system 402 and a hanger ring 403 .

[0068] The formwork system 500 includes square timber 501 and formwork 502 .

[0069] The suspension support system 100 is composed of a main longitudinal beam 101, a main cross beam 102, a first column 103, a second column 104, a diagonal brace 105, a first hanger system 106, an outer formwork cross beam 107, an inner formwork cross beam 108, and a stopper 109. Stoppers 109 are provided at the upper part of both ends of the main longitudinal beam 101 to prevent the pulley system 300 from falling from both ends when sliding on the main longitudinal beam 101. In this embodiment, there are two main longitudinal beams 101, which are arranged along the bridge direction. A first column 103 and a second column 104 are connected below each main longitudinal beam 101. The main longitudinal beam 101 is supported on the track beam 201 of the track system 200 through the first column 103, and is supported on the top of the steel beam 601 of the steel-concrete composite beam 600 through the second column 104. The main crossbeam 102 intersects the two main longitudinal beams 101 vertically, is disconnected at the intersection with the main longitudinal beams 101, and is welded and connected with the main longitudinal beams 101. Five main crossbeams are provided in this embodiment to meet the force requirements of the suspension formwork system 500 and the sliding beam hanger system 400. A support steel plate is provided at the bottom of the column foot of the first column 103, and a layer of U-shaped polytetrafluoroethylene plate is attached to the bottom and front and rear ends of the support steel plate to reduce the friction effect of the column foot sliding on the track beam 201. The first column 103 column foot bottom steel plate is provided on both sides with a stiffening anti-derailment steel plate, and a limit bolt is provided on the stiffening anti-derailment steel plate to limit the suspension bracket system 100 from sliding along the bridge during construction. A diagonal brace 105 is provided between the second column 104 and the main longitudinal beam 101 to improve overall stability. The lower end of the column foot of the second column 104 is forked and slotted to pass through the shear nail 603 at the top of the steel beam 601. A supporting steel plate is provided at the bottom of the foot of the second column 104, and a layer of U-shaped polytetrafluoroethylene plate is attached to the bottom and front and rear ends of the supporting steel plate to reduce the friction of the foot sliding on the top of the steel beam 601. A pull ring is provided on the front side of the second column 104 for traction. A plurality of first suspension rod systems 106 are provided on each main beam 102. The upper end of the first suspension rod system 106 is hung on the main beam 102, and the lower end suspends the outer formwork beam 107 and the inner formwork beam 108. A short column is provided on the outer end of the outer formwork beam 107, which is L-shaped as a whole and is used to support the side formwork.

[0070] The track system 200 is composed of a track beam 201, a sleeper 202, and a reaction frame 203. The track beam 201 is a standard segment and can be extended by bolts. The sleeper 202 is arranged between the cast bridge deck 602 and the track beam 201 to support and level the track beam 201. The reaction frame 203 is composed of a cross beam and two sets of tension screws to fix the track beam 201.

[0071] The pulley system 300 is composed of a main frame 301, a pulley beam 302, a working platform 303, a guardrail 304, and a ladder 305. The main frame 301 is a gate-shaped or n-shaped steel structure, and a ladder 305 is provided inside the vertical columns on both sides, and the column bottom is connected to the working platform 303, and a guardrail 304 is provided around the working platform 303. The pulley beam 302 is vertically connected to the main frame 301, and the bottom of the pulley beam 302 at both ends is provided with paired stiffening anti-derailment steel plates to form a "π"-shaped connecting seat, and the outer steel plate is provided with a limit bolt for preventing rollover and overturning, and a roller is provided between the stiffening anti-derailment steel plates. The pulley system 300 is set up on the main longitudinal beam 101 and can slide along the main longitudinal beam 101.

[0072] In this embodiment, two sets of sliding beam hanger systems 400 are arranged under the flange of each cast bridge deck 602. The sliding beam hanger system 400 is composed of a sliding beam 401, a second hanger system 402, and a lifting ring 403. The upper end of the second hanger system 402 is fixed to the cast bridge deck 602 or the main crossbeam 102 through a nut and a spacer, and the lower end is connected to the lifting ring 403 through a nut. Each set of sliding beam hanger systems 400 includes three sets of second hanger systems 402 and lifting rings 403. The lifting ring 403 is a rectangular frame welded by steel plates. An upper limit column and a lower roller are arranged between the two side plates of the lifting ring 403. Support wheels are arranged at both ends of the lower roller. The sliding beam 401 is slidably installed on the support wheels of the three sets of lifting rings 403, and the upper limit column is located above the sliding beam 401. The frontmost set of second hanger rod systems 402 and hanging rings 403 are suspended on the frontmost main beam 102 , and the rear two sets of second hanger rod systems 402 and hanging rings 403 are suspended on the cast bridge deck 602 .

[0073] The template system 500 is composed of square wood 501 and template 502. The square wood 501 and the template 502 are connected together by nails. The length of each section of square wood 501 and the size of each block of template 502 are determined based on the principle of convenient assembly and disassembly of the template.

[0074] The present invention also provides a method for constructing a steel-concrete composite beam bridge deck using the above-mentioned continuous construction device for the steel-concrete composite beam bridge deck, such as Figures 8 to 14 As shown, the specific steps include:

[0075] S1. Design the device. Based on mechanical analysis, determine the size of each component, thickness of each steel plate and other parameters of the device;

[0076] S2. Process and manufacture the various components of the device in the factory and transport them to the construction site after processing;

[0077] S3, assemble the components on the ground according to the system, and then use lifting equipment such as truck cranes to lift each system onto the steel beam for fixed assembly;

[0078] S4, installing the formwork system 500;

[0079] S5. Tie up the steel bars of the bridge deck to be constructed;

[0080] S6. pouring concrete and curing;

[0081] S7. After the concrete of the bridge deck 602 in the pouring section reaches the expected strength, the worker descends from the ladder on the main frame 301 on the pulley system 300 to the working platform 303, removes the formwork under the flange of the bridge deck 602 and the outer formwork beam 107, and lowers them together onto the sliding beam 401; the formwork and inner formwork beam 108 in the box of the steel beam 601 are removed by the worker in the box; and all the first suspension rod systems 106 are removed;

[0082] S8. Lay the sleepers 202 and the sections of the track beam 201 on the cast bridge deck 602. The sections of the track beam 201 are connected into one piece by bolts. The end of the extended track beam 201 is fixed by a reaction frame 203.

[0083] S9, install a reaction tripod and a fall chain in front of the steel beam 601, connect the fall chain hook with the pull ring on the second column 104, loosen the limit bolt on the column foot of the first column 103, operate the fall chain, drive the suspension bracket system 100, the pulley system 300, the sliding beam hanger system 400, the template system 500 placed on the sliding beam 401 and the outer template crossbeam 107 to move forward together until the predetermined position, and then tighten the limit bolt on the column foot of the first column 103;

[0084] S10, dismantle the fall chain and reaction tripod, and install the first suspension rod system 106, the second suspension rod system 107, and the formwork system 500;

[0085] S11, looping S5 to S10 until the construction of the bridge decks on all the steel-concrete composite beams 600 is completed;

[0086] S12. Use lifting equipment such as truck cranes in conjunction with demolition equipment, and finally carry out auxiliary construction of the bridge deck.

[0087] During the pouring construction of the steel-concrete composite beam bridge deck, the device of the present invention can be used for segmented continuous construction, saving a large amount of formwork supports and manpower, and is very suitable for the construction of long-line steel-concrete composite beams 600.

[0088] During the bridge deck casting process, the device of the present invention supports the formwork system 500 of the bridge deck flange part, avoiding the installation of triangular brackets on the web of the steel beam 601 and the erection of floor brackets, thereby neither damaging the steel beam 601 nor affecting the operation of the existing route at the bottom of the bridge.

[0089] The device of the present invention has low manufacturing cost and can be reused, thus saving a lot of construction cost.

[0090] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the present invention, or are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A continuous construction device for a steel-concrete composite beam bridge deck, characterized in that: It comprises a suspension support system (100), a track system (200), a pulley system (300), a sliding beam hanger system (400), and a template system (500); The track system (200) is installed on the cast bridge deck (602) of the steel-concrete composite beam (600), the suspension support system (100) can be slidably installed on the track system (200) and the steel beam (601) of the steel-concrete composite beam (600) along the direction of the bridge, the sliding beam hanger system (400) is suspended and installed below the suspension support system (100) and the cast bridge deck (602), the pulley system (300) can be slidably installed on the suspension support system (100) along the direction of the bridge, and the formwork system (500) is suspended and installed at the bottom of the suspension support system (100).

2. A continuous construction device for a steel-concrete composite beam bridge deck according to claim 1, characterized in that: The suspension support system (100) comprises a main longitudinal beam (101), a main cross beam (102), a first column (103), a second column (104), a diagonal brace (105), a first suspension rod system (106), an outer formwork cross beam (107), an inner formwork cross beam (108) and a stopper (109); There are two main longitudinal beams (101), and blocks (109) are provided at both ends of the top of the main longitudinal beams (101). One end of the bottom of the main longitudinal beam (101) is slidably supported on the track system (200) through a first column (103), and the other end of the bottom of the main longitudinal beam (101) is slidably supported on the steel beam (601) through a second column (104). A diagonal brace (105) is provided between the second column (104) and the main longitudinal beam (101); the two main longitudinal beams (101) intersect vertically and have a plurality of main cross beams (106). 02), each main cross beam (102) is disconnected at the intersection with the main longitudinal beam (101) and is welded to the main longitudinal beam (101); a plurality of first suspension rod systems (106) are arranged on each main cross beam (102), an outer formwork cross beam (107) is suspended on the first suspension rod system (106) corresponding to the main cross beam (102) outside the main longitudinal beam (101), and an inner formwork cross beam (108) is suspended on the first suspension rod system (106) corresponding to the main cross beam (102) between the two main longitudinal beams (101).

3. The continuous construction device for steel-concrete composite beam bridge deck according to claim 2 is characterized in that: The bottom of the column feet of the first column (103) and the second column (104) are both provided with supporting steel plates, and the bottom of the supporting steel plates are provided with U-shaped polytetrafluoroethylene plates; the bottom of the supporting steel plate of the first column (103) is provided with reinforcing anti-slipping steel plates on both sides of the track system (200), and limiting bolts are arranged on the reinforcing anti-slipping steel plates; the supporting steel plate and the U-shaped polytetrafluoroethylene plate of the second column (104) are provided with slots for shear nails (603) to pass through.

4. The continuous construction device for steel-concrete composite beam bridge deck according to claim 3 is characterized in that: A pull ring is provided on the front side of the second column (104).

5. The continuous construction device for steel-concrete composite beam bridge deck according to claim 4 is characterized in that: The outer template cross beam (107) is an L-shaped structure, and the inner template cross beam (108) is an I-shaped structure.

6. The continuous construction device for steel-concrete composite beam bridge deck according to claim 5, characterized in that: The track system (200) comprises a track beam (201), a sleeper (202) and a reaction frame (203); There are two track beams (201) arranged on the cast bridge deck (602), the sleepers (202) are arranged between the cast bridge deck (602) and the track beam (201), the reaction frame (203) is composed of a cross beam and two sets of tension screws, the cross beam is supported on the track beam (201), one end of the tension screw passes through the top of the cross beam and is fixed by a nut, and the other end passes through the bottom of the cast bridge deck (602) and is fixed by a nut.

7. A continuous construction device for steel-concrete composite beam bridge deck according to claim 6, characterized in that: The pulley system (300) includes a main frame (301), a pulley beam (302), a working platform (303), a guardrail (304) and a ladder (305); The main frame (301) is an n-shaped structure. The bottoms of the vertical columns on both sides of the main frame (301) are connected to the working platform (303). The working platform (303) is provided with guardrails (304) around. The vertical columns on both sides of the main frame (301) are provided with ladders (305) inside. The pulley beam (302) is vertically connected to the transverse beam on the top of the main frame (301). "π"-shaped connecting seats are provided at both ends of the bottom of the pulley beam (302). A roller is provided between the two side plates of the "π"-shaped connecting seat and the roller is rotatably installed on the main longitudinal beam (101). The side plates of the "π"-shaped connecting seat are provided with limit bolts, and the limit bolts are clamped under the upper flange plate of the main longitudinal beam (101).

8. The continuous construction device for steel-concrete composite beam bridge deck according to claim 7, characterized in that: The sliding beam hanger system (400) comprises a sliding beam (401), a second hanger rod system (402) and a hanger ring (403); The upper end of the second suspension rod system (402) is fixed to the cast bridge deck (602) and the main cross beam (102) through nuts and pads, and the lower end of the second suspension rod system (402) is connected to the lifting ring (403) through nuts. The lifting ring (403) is a rectangular frame structure. An upper limit column and a lower roller are arranged between the two side plates of the lifting ring (403). Support wheels are arranged at both ends of the lower roller. The sliding beam (401) is slidably installed on the support wheels of the three groups of lifting rings (403), and the upper limit column is located above the sliding beam (401).

9. A continuous construction device for steel-concrete composite beam bridge deck according to claim 8, characterized in that: The formwork system (500) comprises square timber (501) and formwork (502), wherein the square timber (501) and formwork (502) are connected as a whole by nails, and the square timber (501) and formwork (502) are erected on an outer formwork crossbeam (107) and an inner formwork crossbeam (108).

10. A construction method for the continuous construction device for steel-concrete composite beam bridge deck according to claim 9, characterized in that: The specific steps are: S1. Design the device. Based on mechanical analysis, determine the size of each component and the thickness of each steel plate; S2. Process and manufacture the various components of the device in the factory and transport them to the construction site after processing; S3, assembling the components on the ground according to the system, and then using a truck crane to hoist each system onto the steel beam (601) for fixed assembly; S4, installing the formwork system (500); S5. Tie up the steel bars of the bridge deck to be constructed; S6. pouring concrete and curing; S7. After the concrete of the poured bridge deck (602) reaches the expected strength, the worker descends from the ladder (305) of the main frame (301) on the pulley system (300) to the working platform (303), and removes the formwork system (500) and the outer formwork beam (107) under the flange of the poured bridge deck (602), and lowers them together onto the sliding beam (401); the formwork system (500) and the inner formwork beam (108) in the box of the steel beam (601) are removed by the worker in the box; all the first suspension rod systems (106) are removed; S8, laying the sleepers (202) and the segments of the track beam (201) on the cast bridge deck (602), the segments of the track beam (201) are connected into one body by bolts, and the track beam (201) is fixed by a reaction frame (203); S9, installing a reaction tripod and a fall chain in front of the steel beam (601), connecting the fall chain hook to the pull ring on the second column (104), loosening the limit bolt on the column foot of the first column (103), operating the fall chain, driving the suspension support system (100), the pulley system (300), the sliding beam hanger system (400), the formwork system (500) placed on the sliding beam (401), and the outer formwork crossbeam (107) to move forward together until they reach a predetermined position, and then tightening the limit bolt on the column foot of the first column (103); S10, dismantling the fall chain and reaction tripod, and installing the first suspension rod system (106), the second suspension rod system (402), and the formwork system (500); S11, looping step S5 to step S10 until the construction of the bridge decks on all the steel-concrete composite beams (600) is completed; S12. Use a truck crane in conjunction with the demolition device to finally carry out the auxiliary construction of the bridge deck.

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