Steel structure construction system and construction method of steel box tied arch bridge

Abstract

The present invention provides a steel box tied arch bridge steel structure construction system and a construction method. During the transportation of steel beam components, transport isolation and protection brackets are added to ensure the quality of the steel beam components and the transportation safety. The temporary bracket system adopts a method of directly connecting steel pipe columns with strip foundation embedded parts through connecting sleeves, and the steel pipe columns are also anchored to each other by unit sliding connectors. An integral steel frame is arranged on the top, so that the entire temporary bracket system has a fast construction speed and good stability. The fixed steel beam components are fine-tuned by a steel beam component splicing position adjustment device composed of an L-shaped steel plate and a jack, so as to ensure that the joints are neat and the elevations are appropriate, reduce the waste of raw materials, and greatly improve the installation accuracy and quality of the steel beam components. The temporary fixing system is formed by a horse plate and clamps on both sides between the steel beam components being installed and the installed steel structure, so the time required for hoisting and splicing work is greatly shortened.

Description

Technical Field

[0001] The invention relates to the technical field of bridge construction, and in particular to a steel box tied arch bridge steel structure construction system and a construction method. Background Art

[0002] Steel box tied arch bridges have the advantages of large spanning capacity, practicality and durability, beautiful appearance, and little interference with traffic during construction. Compared with stone arch bridges and concrete arch bridges, steel box tied arch bridges have the lightest deadweight. In addition, the light weight of the steel arch ribs facilitates the segment assembly construction method. As a result, they have gradually become one of the commonly used bridge types in urban bridges and scenic spots in my country.

[0003] However, the structure of steel box tie arch bridge is relatively complex, so there are many factors that affect the stability and dynamic performance of the structure. Although the development of steel arch bridges in my country has made great strides, better designs and beautiful shapes are constantly emerging in my country, and research has been conducted on arch axis optimization, lateral distribution of arch bridge loads, and the creation and improvement of design calculation theories for various forms of arch bridges. However, there are still many problems in the design and construction of steel box tie arch bridges, such as the problem of temporary fixation of components under lifting conditions, the installation efficiency of lower steel pipe columns, and the safety protection of aerial operations during construction.

[0004] In response to such problems, there is an urgent need to invent a steel box tied arch bridge steel structure construction method with good safety, high construction efficiency, and better economic and technical benefits. Summary of the invention

[0005] The purpose of the present invention is to provide a steel box tied arch bridge steel structure construction system and construction method, aiming to solve the technical problems of low safety and low construction efficiency of steel box tied arch bridge steel structure construction at the current stage.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] The steel structure construction system of the steel box tied arch bridge includes the transport isolation protection bracket, the temporary hoisting bracket system, the temporary fixing device of the steel beam component and the splicing position adjustment device of the steel beam component;

[0008] The steel beam component is arranged on the transport isolation protection bracket;

[0009] The temporary support system for hoisting includes a steel pipe column, a unitized sliding connector and an integral steel frame; the bottom of the steel pipe column is positioned and installed with a connecting sleeve on a strip reinforced concrete foundation; the unitized sliding connector is positioned and arranged between the steel pipe columns; a shelf plate is positioned and arranged on the top of the steel pipe column; the integral steel frame is positioned and installed on the shelf plate;

[0010] The temporary fixing device for the steel beam component comprises a horse plate and a temporary clamp; the horse plate is arranged at the closing position of the ends of two adjacent components; the temporary clamp comprises a clamp plate 1 and a clamp plate 2; the clamp plate 1 and the clamp plate 2 are connected by a connecting rod; the clamp plate 1 and the clamp plate 2 are respectively positioned and clamped with the adjacent components to realize the positioning setting between the adjacent components;

[0011] The steel beam component splicing position adjustment device includes a jack and an L-shaped steel plate; the jack and the L-shaped steel plate are respectively arranged on adjacent components; the L-shaped steel plate is positioned on one side component; the jack abuts against the L-shaped steel plate to limit the position, thereby realizing the positioning adjustment of adjacent components.

[0012] As a further improvement of the present invention, the transport isolation and protection bracket includes an adjustable limit rod, a detachable cross beam and auxiliary rods; the auxiliary rods include a bottom rod, a vertical rod, a diagonal brace and a vertical sliding rod; the bottom rod is symmetrically arranged on both sides of the loading and unloading plate of the transport vehicle along the vehicle length direction; a vertical rod is arranged at the end of the bottom rod; a diagonal brace is arranged between the vertical rods on both sides; vertical sliding rods are arranged at equal intervals on the bottom rod body.

[0013] As a further improvement of the present invention, a detachable crossbeam is arranged between the vertical sliding bars on both sides; a slide groove is arranged on the detachable crossbeam; an adjustable limit rod is installed in the slide groove; and a rubber surface layer is arranged on the top surface of the detachable crossbeam and the side surface of the adjustable limit rod.

[0014] As a further improvement of the present invention, a safety protection frame that is easy to install and disassemble is arranged around the temporary hoisting support system; an adjustable temporary support is arranged on the top; and a steel beam component is hoisted on the temporary support.

[0015] As a further improvement of the present invention, the safety protection frame is installed on the steel pipe column through a corbel clamp; a vertical safety protection net is arranged between adjacent vertical poles of the safety protection frame; and a horizontal safety protection net is arranged between adjacent horizontal poles.

[0016] As a further improvement of the present invention, the adjustable temporary support is arranged on the top surface of the integral steel frame; the adjustable temporary support includes a built-in jack, a transverse partition plate and a support body; through holes are arranged vertically at equal intervals on the support body, and limit pins can be set in the through holes.

[0017] As a further improvement of the present invention, a connecting sleeve is provided on the strip reinforced concrete foundation; the connecting sleeve is connected to the vertical screw anchor embedded in the strip reinforced concrete foundation through its bottom plate; a vertical steel pipe column connecting anchor is also provided on the bottom plate of the connecting sleeve.

[0018] As a further improvement of the present invention, the unit sliding connector includes an outer ring plate, an inner ring plate and a connecting plate; the outer ring plate and the inner ring plate enclose adjacent steel pipe columns and are anchored; the inner ring plates are connected to form a whole through the connecting plate; the upper and lower unit sliding connectors are anchored into a whole through an inclined plate.

[0019] As a further improvement of the present invention, the first and second splints both include an adjusting rod, a movable upper panel, a fixed lower panel and a U-shaped groove plate; the adjusting rod passes through the threaded hole on the top surface of the U-shaped groove plate and is embedded in the reserved hole for the rod of the movable upper panel; a connecting shaft is provided on the back side of the U-shaped groove plate; a hinge ball with a through hole is provided in the connecting shaft; the temporary clamps in the same group are connected into a whole through a connecting rod between the hinge balls.

[0020] The construction method of the steel box tied arch bridge steel structure comprises the following steps:

[0021] S1. Construction preparation: The prefabrication of steel beam components is carried out in the factory, including steel arch rib components and bridge deck components; the bridge deck components include end cross beams, middle cross beams, side beams, middle beams and crisscrossing small longitudinal beams; the component stacking area and hoisting route are planned in advance on site;

[0022] S2. Transportation of steel beam components to the construction site: Steel beam components are transported to the construction site by transport trucks. To prevent the steel beam components from tipping over or being damaged by bumps, isolation and protection brackets are installed in advance on the transport trucks. The steel beam components are hoisted into the isolation and protection brackets in sequence at the prefabrication plant, and the adjustable limit rods are manually adjusted to limit the position of a single steel beam component between adjacent adjustable limit rods. After the first layer of steel beam components are loaded, the detachable cross beams are stacked on top of them, and then the loading continues until the load is full;

[0023] S3. Installation of temporary support system: Install the connection sleeve on the strip reinforced concrete foundation in advance, and use a crane to directly connect the steel pipe column with the connection sleeve and anchor it manually. At the same time, manually assemble the unitized sliding connector at the bottom of the steel pipe column. During assembly, the outer ring plate and the inner ring plate are initially anchored, and the inclined plate and the upper and lower connecting plates are fully anchored. Use a crane to lift the unitized sliding connector along the steel pipe column to the specified position, and then manually anchor the outer ring plate and the inner ring plate completely. Simultaneously use a crane and manual assistance to install the safety protection frame and the integral steel frame;

[0024] S4. Lifting and docking of steel beam components: When lifting, first lift the steel beam component off the ground, and use the ropes independently fixed at both ends of the steel beam component to manually assist the crane to make adjustments, then slowly lift the steel beam component to above the top of the temporary support column, and then use the ropes to rotate the component to align it with the top of the column, so that the steel beam component is in place and docked, and then slowly drop the hook;

[0025] S5. Measure elevation and make adjustments: After the steel beam components are initially docked in the air, the crane is on standby to maintain the balance of the steel beam components, and the elevation of the top surface of the hoisted steel beam components and the axis position of the interface are re-measured by the total station, and the adjustable temporary support on the top surface of the integral steel frame is adjusted to make it fully stressed;

[0026] S6. Weld the saddle plate and install temporary fixtures: After the installation position of the component is initially adjusted in the air, the saddle plate is welded and fixed. For components with heavy weight or uneven size, temporary fixtures are added to assist in fixing;

[0027] S7. Check the reserved welds: After the crane is in standby mode, the steel cables are in a relaxed state. Check the reserved gaps between components and the appearance of the components. If local deformation of the steel plates or misalignment of the butt joints are found during the hoisting process and affect the subsequent welding of the steel structure, adjustments need to be made.

[0028] S8. Jack fine-tuning: After the reserved welds are inspected and qualified, an L-shaped steel plate is welded upside down at the end of the butt joint component, with the upper direction of the L-shaped steel plate facing the direction of the hoisting component. A jack is placed at the bottom of the vertical L-shaped steel plate, and the elevation error of the steel beam components on both sides is eliminated by repeatedly adjusting the jack. Then, a jack is placed horizontally between adjacent horizontal L-shaped steel plates, and the horizontal error of the steel beam components on both sides is eliminated by repeatedly adjusting the jack. Finally, the jack is removed, and the horse plate is welded. The inverted L-shaped steel plate can be removed simultaneously, or it can be removed together with the horse plate at the end.

[0029] S9, continue to hoist the next steel beam component: after the work is completed, the crane cable can be dismantled and the hoisting of the next steel beam component can be continued;

[0030] S10. Centralized welding of steel beam components: After all components are hoisted, centralized welding operations are carried out to fully weld the joints at the saddle plates. After the component welding is completed and inspected to be qualified, the saddle plates and temporary fixtures can be removed to complete the site clearance.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] The present invention adds a transport isolation and protection bracket during the transportation of the steel beam components to prevent the steel beam components from tipping over or being bumped and damaged during transportation, thereby ensuring the quality of the steel beam components and the safety of transportation; the temporary bracket system adopts a method of directly connecting the steel pipe column with the strip foundation embedded parts through the connecting sleeve, and the steel pipe columns are also anchored to each other by unit sliding connectors, and an integral steel frame is arranged on the top, so that the entire temporary bracket system has a fast construction speed and good stability; the fixed steel beam components are fine-tuned by the steel beam component splicing position adjustment device composed of L-shaped steel plates and jacks, so as to ensure that the joints are neat and the elevations are appropriate, avoid the possible steel beam components caused by the traditional use of sledgehammers and cutting machines, reduce the waste of raw materials, and greatly improve the installation accuracy and quality of the steel beam components; the steel beam components being installed and the installed steel structures are connected through horse plates and clamps on both sides to form a temporary fixing system, which greatly shortens the time required for hoisting and splicing. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. It is obvious that the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 It is a schematic diagram of the transport isolation protection bracket structure;

[0035] Figure 2 It is a schematic diagram of the stacking of steel beam components in the transport isolation protection bracket;

[0036] Figure 3 It is a schematic diagram of the structure of the detachable crossbeam on the transport isolation protection bracket;

[0037] Figure 4 It is a structural diagram of the temporary support system for hoisting;

[0038] Figure 5 It is a schematic diagram of an adjustable temporary support;

[0039] Figure 6 This is a schematic diagram of the installation of the connecting sleeve on the strip reinforced concrete foundation;

[0040] Figure 7 is a top view of a unit type sliding connection;

[0041] Figure 8 This is a top view of the easy-to-install and disassemble safety protection frame;

[0042] Fig. 9 This is the schematic diagram of the installation of the horse board and temporary fixture;

[0043] Fig.10 It is a schematic diagram of a single temporary fixture structure;

[0044] Fig.11 It is a schematic diagram of the components of a single temporary fixture;

[0045] Fig.12 This is a schematic diagram of the welding construction of the horse plate;

[0046] Fig.13 This is a schematic diagram of the steel beam component hoisting construction;

[0047] Fig.14 It is a construction flow chart of the present invention;

[0048] Description of the numbers in the figure:

[0049] 1. Transmission isolation protection bracket; 11. Adjustable limit rod; 12. Removable cross beam; 121. Slide; 13. Auxiliary rods; 131. Bottom rod; 132. Vertical rod; 133. Diagonal brace; 134. Vertical slide rod; 2. Temporary support system for hoisting; 21. Steel pipe column; 22. Unit sliding connector; 221. Outer ring plate; 222. Inner ring plate; 223. Connecting plate; 224. Diagonal plate; 23. Integral steel frame; 24. Strip reinforced concrete foundation; 25. Connecting sleeve; 26. Shelf plate; 27. Safety protection frame; 28. Adjustable temporary support; 281. Built-in jack; 2 82. Horizontal partition; 283. Support body; 284. Limiting pin; 29. ​​Corbel clamp; 3. Temporary fixing device for beam member; 31. Horse plate; 32. Temporary clamp; 321. Clamp one; 322. Clamp two; 3201. Adjusting swivel rod; 3202. Movable upper panel; 3203. Fixed lower panel; 3204. U-shaped groove plate; 3205. Connecting shaft; 3206. Hinged ball; 4. Device for adjusting the splicing position of steel beam member; 41. Jack; 42. L-shaped steel plate; 5. Steel beam member; 6. Crane; 7. Permanent support; 8. Block No. 0; 9. Capping platform; 10. Pile foundation. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0051] Combined with Figures 1 to 14The present invention provides a steel box tied arch bridge steel structure construction system and a construction method, aiming to solve the technical problems of low safety and low construction efficiency of steel box tied arch bridge steel structure construction at the current stage.

[0052] Specifically, the steel box tied arch bridge steel structure construction system includes a transport isolation protection bracket 1, a temporary hoisting bracket system 2, a temporary fixing device for steel beam components 3 and a splicing position adjustment device for steel beam components 4;

[0053] The steel beam component 5 is arranged on the transport isolation protection bracket 1;

[0054] The temporary support system 2 for hoisting includes a steel pipe column 21, a unitized sliding connector 22 and an integral steel frame 23; the bottom of the steel pipe column 21 is positioned and installed with a connecting sleeve 25 on a strip reinforced concrete foundation 24; the unitized sliding connector 22 is positioned and installed between the steel pipe columns 21; a shelf plate 26 is positioned and installed on the top of the steel pipe column 21; the integral steel frame 23 is positioned and installed on the shelf plate 26;

[0055] The temporary fixing device 3 for the steel beam member includes a horse plate 31 and a temporary clamp 32; the horse plate 31 is arranged at the closing position of the ends of two adjacent members; the temporary clamp 32 includes a clamp plate 1 321 and a clamp plate 2 322; the clamp plate 1 321 and the clamp plate 2 322 are connected by a connecting rod 323; the clamp plate 1 321 and the clamp plate 2 322 are respectively positioned and clamped with adjacent members, so as to realize the positioning setting between adjacent members;

[0056] The steel beam component splicing position adjustment device 4 includes a jack 41 and an L-shaped steel plate 42; the jack 41 and the L-shaped steel plate 42 are respectively arranged on adjacent components; the L-shaped steel plate 42 is positioned on one side component; the jack 41 and the L-shaped steel plate 42 are abutted and limited, thereby realizing the positioning adjustment of adjacent components.

[0057] It should be noted that the L-shaped steel plate 42 is welded first, and then the jack 41 is placed; the lower end of the horizontal plate of the L-shaped steel plate 42 can be positioned and connected with the piston rod end of the jack 41; the side of the L-shaped steel plate 42 is positioned and connected with the piston rod end or the bottom end of the jack 41, and the positioning connection between the two L-shaped steel plates 42 and the jack 41 is used to achieve the abutment and limiting of adjacent components. The structure is simple, the design is ingenious, and the use is flexible; the steel beam component 5 is transported to the construction site by a vehicle equipped with a transport isolation and protection bracket 1, and a temporary hoisting bracket system 2 is set up on the strip reinforced concrete foundation 24 at the construction site.

[0058] Furthermore, the transport isolation and protection bracket 1 includes an adjustable limit rod 11, a detachable cross beam 12 and an auxiliary rod 13; the auxiliary rod 13 includes a bottom rod 131, a vertical rod 132, a diagonal brace 133 and a vertical sliding rod 134; the bottom rod 131 is symmetrically arranged on both sides of the loading and unloading plate of the transport vehicle along the vehicle length direction; a vertical rod 132 is arranged at the end of the bottom rod 131; a diagonal brace 133 is arranged between the vertical rods 132 on both sides; vertical sliding rods 134 are arranged at equal intervals on the rod body of the bottom rod 131.

[0059] Furthermore, a detachable crossbeam 12 is arranged between the vertical slide bars 134 on both sides; a slide groove 121 is arranged on the detachable crossbeam 12; an adjustable limit rod 11 is installed in the slide groove 121; and a rubber surface layer is arranged on the top surface of the detachable crossbeam 12 and the side surface of the adjustable limit rod 11.

[0060] Furthermore, an easily installed and disassembled safety protection frame 27 is arranged around the temporary hoisting support system 2; an adjustable temporary support 28 is arranged on the top; a steel beam component 5 is hoisted on the temporary support; the connected steel beam components 5 are preliminarily connected by a temporary fixing device and a splicing position adjustment device in the hoisting state, and after all the steel beam components 5 are preliminarily connected, full welding construction is uniformly carried out at the joints of the steel beam components 5.

[0061] Furthermore, the safety protection frame 27 is installed on the steel pipe column 21 through the corbel clamp 29; a vertical safety protection net is arranged between adjacent vertical poles of the safety protection frame 27; and a horizontal safety protection net is arranged between adjacent horizontal poles.

[0062] Furthermore, the adjustable temporary support 28 is arranged on the top surface of the integral steel frame 23; the adjustable temporary support 28 includes a built-in jack 281, a transverse partition plate 282 and a support body 283; through holes are arranged vertically at equal intervals on the support body 283, and a limit pin 284 can be set in the through hole.

[0063] Furthermore, a connecting sleeve 25 is provided on the strip reinforced concrete foundation 24; the connecting sleeve 25 is anchored and connected to the vertical screw rod embedded in the strip reinforced concrete foundation 24 through its bottom plate; and a vertical steel pipe column 21 connecting anchor rod is also provided on the bottom plate of the connecting sleeve 25.

[0064] Furthermore, the unit sliding connector 22 includes an outer ring plate 221, an inner ring plate 222 and a connecting plate 223; the outer ring plate 221 and the inner ring plate 222 enclose adjacent steel pipe columns 21 and are anchored; the inner ring plates 222 are formed as a whole through the connecting plate 223; the upper and lower unit sliding connectors 22 are anchored as a whole through the inclined plate 224.

[0065] Furthermore, the splint 1 321 and the splint 2 322 both include an adjusting rod 3201, a movable upper panel 3202, a fixed lower panel 3203 and a U-shaped groove plate 3204; the adjusting rod 3201 passes through the threaded hole on the top surface of the U-shaped groove plate 3204 and is embedded in the reserved hole for the rod of the movable upper panel 3202; a connecting shaft 3205 is provided on the back side of the U-shaped groove plate 3204; a hinge ball 3206 with a through hole is provided in the connecting shaft 3205; the temporary clamps 32 in the same group are connected into a whole through a connecting rod 323 between the hinge balls 3206.

[0066] The construction method of the steel box tied arch bridge steel structure comprises the following steps:

[0067] S1. Construction preparation: The prefabrication of the steel beam component 5 is carried out in a factory, including steel arch rib components and bridge deck components; the bridge deck components include end cross beams, middle cross beams, side beams, middle beams and crisscrossing small longitudinal beams; the component stacking area and hoisting route are planned in advance on site;

[0068] S2. Transportation of steel beam components to the construction site: The steel beam components 5 are transported to the construction site by transport flatbed trucks. To prevent the steel beam components 5 from tipping over or being bumped and damaged, isolation and protection brackets are installed in advance on the transport flatbed trucks. The steel beam components 5 are hoisted into the isolation and protection brackets in sequence at the prefabrication plant, and the adjustable limit rods 11 are manually adjusted to limit the position of a single steel beam component 5 between adjacent adjustable limit rods 11. After the first-layer steel beam components 5 are loaded, the detachable cross beams 12 are stacked on top of them, and the loading continues until the load is full;

[0069] S3, temporary support system installation: pre-install the connection sleeve 25 on the strip reinforced concrete foundation 24, the steel pipe column 21 is directly connected with the connection sleeve 25 by the crane 6 and manually anchored, and at the same time, the unit sliding connector 22 is manually assembled at the bottom of the steel pipe column 21, and the outer ring plate 221 and the inner ring plate 222 are preliminarily anchored during assembly, and the inclined plate 224 and the upper and lower connecting plates 223 are completely anchored, and the unit sliding connector 22 is lifted to the specified position along the steel pipe column 21 by the crane 6, and then the outer ring plate 221 and the inner ring plate 222 are completely anchored manually, and the safety protection frame 27 and the integral steel frame 23 are installed simultaneously by the crane 6 and manual assistance;

[0070] S4, lifting and docking of steel beam components: when lifting, first lift the steel beam component 5 off the ground, and adjust it manually with the help of the crane 6 through the ropes independently fixed at both ends of the steel beam component 5, and then slowly lift the steel beam component 5 to above the top of the temporary support column, and then rotate the component by the rope to align it with the top of the column, so that the steel beam component 5 is in place and docked, and then slowly drop the hook;

[0071] S5, measuring elevation and adjusting: after the steel beam component 5 is preliminarily docked in the air, the crane 6 stands by to maintain the balance of the steel beam component 5, and re-measures the elevation of the top surface of the hoisted steel beam component 5 and the axis position at the interface through the total station, and adjusts the adjustable temporary support 28 on the top surface of the integral steel frame 23 to make it fully stressed;

[0072] S6. Welding the horse plate and installing temporary fixtures: After the installation position of the component is initially adjusted in the air, the horse plate 31 is welded and fixed. For components with large dead weight or uneven size, temporary fixtures 32 are added to assist in fixing;

[0073] S7, reserved weld inspection: After the crane 6 is on standby, the steel cable is in a relaxed state, and the reserved gaps between the components and the appearance of the components are inspected. If local deformation of the steel plate or misalignment of the butt joints are found during the hoisting process and affect the subsequent welding of the steel structure, adjustments need to be made;

[0074] S8, jack fine-tuning: After the reserved weld is inspected and qualified, an L-shaped steel plate 42 is welded invertedly at the end of the butt joint component, the upper direction of the L-shaped steel plate 42 is facing the direction of the hoisting component, and a jack 41 is placed at the lower part of the vertical L-shaped steel plate 42. The elevation error of the steel beam components 5 on both sides is eliminated by repeatedly adjusting the jack 41. Then, a jack 41 is placed horizontally between adjacent horizontal L-shaped steel plates 42. The horizontal error of the steel beam components 5 on both sides is eliminated by repeatedly adjusting the jack 41. Finally, the jack 41 is removed, and the horse plate 31 is welded. The inverted L-shaped steel plate 42 can be removed simultaneously, or it can be removed together with the horse plate 31 at the end.

[0075] S9, continue to hoist the next steel beam component: after the work is completed, the steel cable of the crane 6 can be dismantled, and the hoisting of the next steel beam component 5 can be continued;

[0076] S10. Centralized welding of steel beam components: After all components are hoisted, centralized welding operations are carried out to fully weld the joints at the horse plate 31. After the component welding is completed and inspected to be qualified, the horse plate 31 and the temporary fixture 32 can be removed to complete the site clearance.

[0077] The present invention uses a docking plate 31 and a temporary fixture 32 to solve the stability problem of the component under the hoisting state; in addition, the temporary support steel pipe column 21 is directly connected to the strip foundation embedded part through a connector to improve the construction efficiency; at the same time, a safety protection frame is provided for the whole process of component transportation and installation. Compared with the traditional construction method, it has the characteristics of advanced technology, good structural stability, fast construction speed and safety.

[0078] The present invention adds a transport isolation protection bracket 1 during the transportation of the steel beam component 5 to prevent the steel beam component 5 from tipping over or being bumped and damaged during transportation, thereby ensuring the quality and transportation safety of the steel beam component 5; the temporary bracket system adopts a method in which the steel pipe column 21 is directly connected to the strip foundation embedded part through the connecting sleeve 25, and the steel pipe columns 21 are also anchored to each other by the unit sliding connector 22, and an integral steel frame 23 is arranged on the top, so that the entire temporary bracket system has a fast construction speed and good stability; the steel beam component splicing position adjustment device 4 composed of the L-shaped steel plate 42 and the jack 41 is used to fine-tune the fixed steel beam component 5 to ensure that the joint is neat and the elevation is appropriate, avoiding the possible steel beam component 5 caused by the traditional method of using a sledgehammer and a cutting machine, reducing the waste of raw materials, and greatly improving the installation accuracy and quality of the steel beam component 5; by forming a temporary fixing system between the steel beam component 5 being installed and the installed steel structure through the horse plate 31 and the clamps on both sides, the welding time of multiple steel beam components 5 is compressed after the lifting work is completed, which greatly shortens the time required for lifting and splicing.

[0079] The process of this application is simple to operate, the construction efficiency and precision are improved, the high-altitude operation time is reduced, and no special equipment is required; less equipment and personnel are required, the labor intensity is low, and the site occupancy is small; the project cost is reduced; this method has achieved good results in the construction of engineering example projects, and has wide promotion and application value under similar conditions, and the economic and social benefits are very obvious.

[0080] It should be noted that some parts not described in detail in the present invention belong to the well-known technology in the art, or can be directly purchased from the market, and those skilled in the art can obtain them without creative work. The specific connection method is extremely widely used in this art or in daily life, and will not be described in detail here.

[0081] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0082] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0083] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0084] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0085] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0086] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. The construction method of the steel box tied arch bridge steel structure construction system is characterized by: The construction system includes a transport isolation protection bracket, a temporary hoisting bracket system, a temporary fixing device for steel beam components, and a splicing position adjustment device for steel beam components; The steel beam component is arranged on the transport isolation protection bracket; The temporary support system for hoisting includes a steel pipe column, a unitized sliding connector and an integral steel frame; the bottom of the steel pipe column is positioned and installed with a connecting sleeve on a strip reinforced concrete foundation; the unitized sliding connector is positioned and arranged between the steel pipe columns; a shelf plate is positioned and arranged on the top of the steel pipe column; the integral steel frame is positioned and installed on the shelf plate; The temporary fixing device for the steel beam component comprises a horse plate and a temporary clamp; the horse plate is arranged at the closing position of the ends of two adjacent components; the temporary clamp comprises a clamp plate 1 and a clamp plate 2; the clamp plate 1 and the clamp plate 2 are connected by a connecting rod; the clamp plate 1 and the clamp plate 2 are respectively positioned and clamped with the adjacent components to realize the positioning setting between the adjacent components; The steel beam component splicing position adjustment device comprises a jack and an L-shaped steel plate; the jack and the L-shaped steel plate are respectively arranged on adjacent components; the L-shaped steel plate is positioned on one side component; the jack abuts against the L-shaped steel plate to limit the position, thereby realizing the positioning adjustment of adjacent components; The transport isolation protection bracket includes an adjustable limit rod, a detachable cross beam and an auxiliary rod; the auxiliary rod includes a bottom rod, a vertical rod, a diagonal brace and a vertical slide rod; the bottom rod is symmetrically arranged on both sides of the transport vehicle loading and unloading plate along the vehicle length direction; a vertical rod is arranged at the end of the bottom rod; a diagonal brace is arranged between the vertical rods on both sides; vertical slide rods are arranged at equal intervals on the bottom rod body; A detachable crossbeam is arranged between the vertical slide bars on both sides; a slide groove is arranged on the detachable crossbeam; an adjustable limit rod is installed in the slide groove; a rubber surface layer is arranged on the top surface of the detachable crossbeam and the side surface of the adjustable limit rod; The temporary support system for hoisting is surrounded by an easily installed and disassembled safety protection frame; an adjustable temporary support is arranged on the top; a steel beam component is hoisted on the temporary support; The safety protection frame is installed on the steel pipe column through the bracket clamp; a vertical safety protection net is arranged between adjacent vertical poles of the safety protection frame; and a horizontal safety protection net is arranged between adjacent horizontal poles; The adjustable temporary support is arranged on the top surface of the integral steel frame; the adjustable temporary support includes a built-in jack, a transverse partition plate and a support body; through holes are arranged vertically at equal intervals on the support body, and limit pins can be arranged in the through holes; The strip reinforced concrete foundation is provided with a connecting sleeve; the connecting sleeve is connected to the vertical screw rod embedded in the strip reinforced concrete foundation through its bottom plate; a vertical steel pipe column connecting anchor rod is also provided on the bottom plate of the connecting sleeve; The unitized sliding connector comprises an outer ring plate, an inner ring plate and a connecting plate; the outer ring plate and the inner ring plate enclose adjacent steel pipe columns and are anchored; the inner ring plates, the outer ring plates and the inner and outer ring plates are connected to form a whole; the upper and lower unitized sliding connectors are anchored to form a whole through an inclined plate; The clamping plate 1 and the clamping plate 2 both include an adjusting rotary rod, a movable upper panel, a fixed lower panel and a U-shaped groove plate; the adjusting rotary rod passes through the threaded hole on the top surface of the U-shaped groove plate and is embedded in the rotary rod reserved hole of the movable upper panel; a connecting shaft is provided on the back of the U-shaped groove plate, and a hinge ball with a through hole is provided in the connecting shaft; temporary clamps in the same group are connected into a whole through a connecting rod between the hinge balls; The construction method includes the following steps: S1. Construction preparation: The prefabrication of steel beam components is carried out in the factory, including steel arch rib components and bridge deck components; the bridge deck components include end cross beams, middle cross beams, side beams, middle beams and crisscrossing small longitudinal beams; the component stacking area and hoisting route are planned in advance on site; S2. Transportation of steel beam components to the construction site: Steel beam components are transported to the construction site by transport trucks. To prevent the steel beam components from tipping over or being damaged by bumps, isolation and protection brackets are installed in advance on the transport trucks. The steel beam components are hoisted into the isolation and protection brackets in sequence at the prefabrication plant, and the adjustable limit rods are manually adjusted to limit the position of a single steel beam component between adjacent adjustable limit rods. After the first layer of steel beam components are loaded, the detachable cross beams are stacked on top of them, and then the loading continues until the load is full; S3. Installation of temporary support system: Install the connection sleeve on the strip reinforced concrete foundation in advance, and use a crane to directly connect the steel pipe column with the connection sleeve and anchor it manually. At the same time, manually assemble the unitized sliding connector at the bottom of the steel pipe column. During assembly, the outer ring plate and the inner ring plate are initially anchored, and the inclined plate and the upper and lower connecting plates are fully anchored. Use a crane to lift the unitized sliding connector along the steel pipe column to the specified position, and then manually anchor the outer ring plate and the inner ring plate completely. Simultaneously use a crane and manual assistance to install the safety protection frame and the integral steel frame; S4. Lifting and docking of steel beam components: When lifting, first lift the steel beam component off the ground, and use the ropes independently fixed at both ends of the steel beam component to manually assist the crane to make adjustments, then slowly lift the steel beam component to above the top of the temporary support column, and then use the ropes to rotate the component to align it with the top of the column, so that the steel beam component is in place and docked, and then slowly drop the hook; S5. Measure elevation and make adjustments: After the steel beam components are initially docked in the air, the crane is on standby to maintain the balance of the steel beam components, and the elevation of the top surface of the hoisted steel beam components and the axis position of the interface are re-measured by the total station, and the adjustable temporary support on the top surface of the integral steel frame is adjusted to make it fully stressed; S6. Weld the saddle plate and install temporary fixtures: After the installation position of the component is initially adjusted in the air, the saddle plate is welded and fixed. For components with heavy weight or uneven size, temporary fixtures are added to assist in fixing; S7. Check the reserved welds: After the crane is in standby mode, the steel cables are in a relaxed state. Check the reserved gaps between components and the appearance of the components. If local deformation of the steel plates or misalignment of the butt joints is found during the hoisting process and affects the subsequent welding of the steel structure, adjustments need to be made. S8. Jack fine-tuning: After the reserved welds are inspected and qualified, an L-shaped steel plate is welded upside down at the end of the butt joint component, with the upper direction of the L-shaped steel plate facing the direction of the hoisting component. A jack is placed at the bottom of the vertical L-shaped steel plate, and the elevation error of the steel beam components on both sides is eliminated by repeatedly adjusting the jack. Then, a jack is placed horizontally between adjacent horizontal L-shaped steel plates, and the horizontal error of the steel beam components on both sides is eliminated by repeatedly adjusting the jack. Finally, the jack is removed, and the horse plate is welded. The inverted L-shaped steel plate can be removed simultaneously, or it can be removed together with the horse plate at the end. S9, continue to hoist the next steel beam component: after the work is completed, the crane cable can be dismantled and the hoisting of the next steel beam component can be continued; S10. Centralized welding of steel beam components: After all components are hoisted, centralized welding operations are carried out to fully weld the joints at the saddle plates. After the component welding is completed and inspected to be qualified, the saddle plates and temporary fixtures can be removed to complete the site clearance.

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