A tower crane foundation for a steel pipe arch bridge and a construction method thereof

Abstract

The present invention relates to a tower crane foundation and a construction method for a steel pipe arch bridge. By means of welding, the base can be welded to the upper chord pipe of the main arch rib, the main cross beam of the overall foundation can be welded to the top of the base, the tower leg embedded part can be welded to the main cross beam, and the vertical support pipe of the tower crane standard section is installed on the tower leg embedded part, so as to ensure that after the tower crane is installed, the load can be evenly transmitted to the upper chord pipe of the main arch rib, and the operation safety of the tower crane on the steel pipe arch bridge is ensured. Moreover, the overall foundation is a prefabricated steel component, which can reduce the installation amount and welding amount of the tower crane foundation construction on the steel pipe arch bridge, that is, reduce the high-altitude operation, make the construction simpler and the welding quality better. By controlling the levelness and verticality of the base and the overall foundation, it is convenient to control the installation accuracy of the tower leg embedded part, so that the tower crane foundation for the steel pipe arch bridge of the present application can be applicable to high-altitude operation environments such as on the arch bridge.

Description

Technical Field

[0001] The present invention relates to the technical field of tower crane foundations, in particular to a tower crane foundation for a steel pipe arch bridge and a construction method thereof. Background Art

[0002] The conventional method for installing a tower crane on the ground is as follows: After accurately positioning and leveling the tower crane foundation legs on the ground, concrete is directly poured. However, in high-altitude working environments such as on an arch bridge, this method for installing the tower crane foundation on the ground is no longer applicable. And directly installing the tower crane foundation legs on the arch has problems such as difficult adjustment of horizontal and vertical degrees, a large number of welds, and difficult control of welding deformation. Summary of the Invention

[0003] The purpose of the present invention is to provide a tower crane foundation for a steel pipe arch bridge and a construction method thereof, aiming at the problem that the existing method for installing a tower crane foundation on the ground cannot be applied to high-altitude working environments such as on an arch bridge.

[0004] In order to achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0005] A tower crane foundation for a steel pipe arch bridge includes a base and an integral foundation. The integral foundation is a prefabricated steel member, which includes a main beam and tower leg embedded parts. The tower leg embedded parts are welded to the main beam, and the tower leg embedded parts are used to connect the vertical support pipe of the tower crane standard section; the base is used to be welded to the upper chord pipe of the steel pipe arch bridge, and the main beam is welded above the base.

[0006] In this solution, the tower leg embedded parts directly bear the upper load, transfer the tower crane load to the main beam. The main beam serves as the main stress structure of the tower crane foundation, and as the installation position of the tower leg embedded parts, it enhances the connection between the upper structure and the arch rib, bears the upper load, can maintain integrity under the action of external loads, and effectively transfers the external load to the base, and then effectively transfers it to the upper chord pipe of the main arch rib.

[0007] By adopting the above tower crane foundation for a steel pipe arch bridge, the base can be welded to the upper chord pipe of the main arch rib by welding. By welding the main beam of the integral foundation to the top of the base, by welding the tower leg embedded parts to the main beam, and by installing the vertical support pipe of the tower crane standard section through the tower leg embedded parts, it can ensure that after the tower crane is installed, the load can be evenly transferred to the upper chord pipe of the main arch rib, ensuring the operation safety of the tower crane on the steel pipe arch bridge. And the integral foundation is a prefabricated steel member, which can reduce the installation amount and welding amount of the tower crane foundation construction on the steel pipe arch bridge, that is, reduce high-altitude operations, make the construction simpler and the welding quality better. By controlling the horizontal and vertical degrees of the base and the integral foundation, it is convenient to control the installation accuracy of the tower leg embedded parts, so that the tower crane foundation for a steel pipe arch bridge of the present application can be applied to high-altitude working environments such as on an arch bridge.

[0008] Preferably, the number of main crossbeams is two, and both of the two main crossbeams are arranged along the transverse direction of the steel pipe arch bridge. The distance between the two main crossbeams is adapted to the width of the standard section of the tower crane. A first support beam and a second support beam are connected between the two main crossbeams. The two ends of the first support beam are arranged corresponding to two longitudinally adjacent tower leg embedded parts of the steel pipe arch bridge, and the two ends of the second support beam are arranged corresponding to the connection positions of the two main crossbeams and the base;

[0009] The base includes two arch crown side steel pipe bases and two arch foot side steel pipe bases. The two arch crown side steel pipe bases are located on the cross-section of the steel pipe arch bridge corresponding to one of the main crossbeams, and the two arch foot side steel pipe bases are located on the cross-section of the steel pipe arch bridge corresponding to the other main crossbeam. The arch crown side steel pipe bases and the arch foot side steel pipe bases are respectively welded to the corresponding upper chord pipes, and the arch crown side steel pipe bases and the arch foot side steel pipe bases are both filled with concrete inside.

[0010] Arranging two main crossbeams along the longitudinal direction of the steel pipe arch bridge, corresponding to the vertical support pipes of the tower crane standard section, is lighter in weight compared to arranging a single whole plate, and is more convenient to arrange on the arch. The base is stably supported on the two upper chord pipes through the two arch crown side steel pipe bases and the two arch foot side steel pipe bases. The two arch foot side steel pipe bases stably support the main crossbeam on the arch foot side on the two upper chord pipes, which is lighter in weight compared to arranging it as a whole and is more convenient to arrange on the arch. And the arch crown side steel pipe bases and the arch foot side steel pipe bases are both filled with concrete inside, which can increase the strength, stiffness, anti-pulling and anti-overturning characteristics of the tower crane foundation and ensure the safety of the tower crane during use. The first support beam strengthens the connection between the main crossbeam and the tower leg embedded part, and at the same time connects the two main crossbeams to ensure the integrity of the overall foundation; the second support beam strengthens the connection position between the main crossbeam and the base, and at the same time connects the two main crossbeams to ensure the integrity of the overall foundation; through the horizontally arranged first support beam and second support beam, the load can be transmitted, and the stiffness and overall stability of the tower crane foundation can be enhanced.

[0011] Adopting the above base and overall foundation, it is lighter in weight, more convenient for transportation and hoisting, has a better installation effect on the arch, and improves the safety of the tower crane when used on the arch.

[0012] Preferably, the concrete inside the arch crown side steel pipe base and the arch foot side steel pipe base has the same grade as the concrete inside the upper chord pipe, which is convenient to pump the concrete inside the arch crown side steel pipe base and the arch foot side steel pipe base together when pumping the concrete inside the upper chord pipe, making the operation more convenient and beneficial to the convenience of high-altitude tower crane construction.

[0013] Preferably, the self-heights of the arch crown side steel pipe base and the arch foot side steel pipe base are the same. A heightening section is also connected above the arch foot side steel pipe base. The lower end of the heightening section is welded to the upper end of the arch foot side steel pipe base, and the top of the heightening section is at the same elevation as the top of the arch crown side steel pipe base. The heightening section is filled with concrete.

[0014] The steel pipe bases on the vault side and the arch springing side can adopt the same components, which is convenient for processing and use. By setting a heightening section above the steel pipe base on the arch springing side, when positioning and installing the steel pipe bases on the vault side and the arch springing side, the heightening section can be cut according to the actual situation after installation, reducing errors and avoiding later corrections, so that the arch springing side and the vault side of the base can support the overall foundation on the same horizontal plane, ensuring the levelness and verticality of the tower crane after installation, and thus ensuring the safe use of the tower crane.

[0015] Preferably, both the heightening section and the top of the steel pipe base on the vault side have installation grooves, and both ends of the main cross beam are welded into the installation grooves of the two heightening sections or welded into the installation grooves of the two steel pipe bases on the vault side.

[0016] Both ends of the main cross beam on the vault side are welded into the installation grooves of the two steel pipe bases on the vault side, and both ends of the main cross beam on the arch springing side are welded into the installation grooves of the two heightening sections. By setting the installation grooves, it is convenient to position and limit the installation position of the main cross beam, and it is also convenient for subsequent pouring of concrete into the base. And the main cross beam is limited by the installation grooves, making the use of the tower crane safer.

[0017] A construction method for the tower crane foundation of a steel pipe arch bridge, used for constructing the tower crane foundation of the steel pipe arch bridge, includes the following construction steps:

[0018] S1. Weld the base to the upper chord pipe of the steel pipe arch bridge and ensure that the elevations of the parts where the base is connected to the overall foundation are equal;

[0019] S2. Weld the main cross beam of the overall foundation to the top of the base, so that the elevations of all tower leg embedded parts are equal.

[0020] Adopting the above construction method for the tower crane foundation of a steel pipe arch bridge, welding the base to the upper chord pipe of the steel pipe arch bridge and ensuring the corresponding accuracy lays a foundation for the convenience and accuracy of the subsequent installation of the overall foundation. The overall foundation adopts factory prefabricated steel components, with higher accuracy, and can reduce the high-altitude welding operation on the arch, making its installation easier and better ensuring the installation accuracy of the tower crane foundation.

[0021] Preferably, when constructing the tower crane foundation of the steel pipe arch bridge:

[0022] Step S1 includes the following construction steps:

[0023] S1A. Position, install and weld the steel pipe bases on the vault side and the arch springing side on the corresponding upper chord pipe, and a positioning plate is welded to the top of the steel pipe base on the arch springing side;

[0024] S1B. Measure the top elevations of the steel pipe pedestals on the vault side and the springing side of the arch, then cut and match the heightening section according to the elevation difference between the steel pipe pedestals on the springing side and the steel pipe pedestals on the vault side of the arch, and then install the heightening section on the top of the steel pipe pedestal on the springing side through the positioning and guiding of the positioning plate;

[0025] In step S2, embed the main cross beam of the integral foundation into the installation groove of the steel pipe pedestal on the vault side or into the installation groove of the heightening section, and then weld the main cross beam to the steel pipe pedestal on the vault side or the heightening section;

[0026] It also includes step S3: Pour concrete downward from the top of the heightening section or the top of the steel pipe pedestal on the vault side.

[0027] In this solution, the heightening section is cut and matched according to the actual installation conditions of the steel pipe pedestals on the vault side and the springing side of the arch on the upper chord pipe of the arch, so as to ensure the levelness of the supporting surface of the pedestal for the upper integral foundation; and the heightening section is installed with limited position guiding through the positioning plate on the top of the steel pipe pedestal on the springing side, which is beneficial to quickly and accurately ensure that the heightening section is installed in place, can reduce the installation difficulty and improve the installation efficiency. Pouring concrete downward from the top of the heightening section or the top of the steel pipe pedestal on the vault side can utilize the gap between the installation groove and the main cross beam to pour concrete, the pouring process is smoother, and after the concrete is formed, it can connect the main cross beam and the pedestal together to improve the connection strength.

[0028] Preferably, before step S2, support steel plates are welded correspondingly on the outer sides of the heightening section and the steel pipe pedestal on the springing side. Fix the fixed end of the jack on the support steel plate of the steel pipe pedestal on the springing side, fix the movable end of the jack on the support steel plate of the heightening section, and then adjust the top elevation of the heightening section through the jack;

[0029] In step S2, after the main cross beam of the integral foundation is correspondingly embedded into the installation groove, first adjust the top elevation of the heightening section through the jack so that the top elevation of the heightening section is equal to the top elevation of the steel pipe pedestal on the vault side, and then weld the main cross beam to the steel pipe pedestal on the vault side or the heightening section to form an integral body;

[0030] Between step S2 and step S3, welding the main cross beam to the steel pipe pedestal on the vault side or the heightening section through the first stiffening plate can form an integral body, improve the connectivity, and is beneficial to the safe use of the tower crane.

[0031] By setting the support steel plate and the jack, the top elevation of the heightening section can be adjusted by using the support of the steel pipe pedestal on the springing side, which is beneficial to improving the installation accuracy.

[0032] Preferably, the integral foundation includes two main cross beams, the main cross beam is a box-shaped cross beam, and the box-shaped cross beam includes an upper flange plate, a lower flange plate and two webs located between the upper flange plate and the lower flange plate;

[0033] Before step S2, it also includes the manufacturing steps of the overall foundation:

[0034] S01. Position and assemble four webs;

[0035] S02. Position and assemble the first support beam and the second support beam between the adjacent webs of the two main crossbeams, then check the assembly positions of the first support beam and the second support beam, and then spot weld the corresponding welds;

[0036] S03. Position and assemble the second stiffening plates on the outer sides of the webs of the two main crossbeams, and then spot weld the corresponding welds;

[0037] S04. Position and install the upper flange plate, and then spot weld the corresponding welds;

[0038] S05. Position and install the tower leg support leg embedded parts, and then spot weld the corresponding welds;

[0039] S06. Weld all the welds symmetrically from the middle to both ends of the overall foundation;

[0040] Among them, in step S06, after the full-penetration fillet weld of the tower leg support leg embedded parts is welded, then position, install and weld the lower flange plate.

[0041] First, adopt the method of fixing with positioning points to ensure the connection between structures such as the web, the first support beam, the second support beam, the second stiffening plate and the upper flange plate, so as to facilitate subsequent welding operations. When welding, welding all the welds symmetrically from the middle to both ends of the overall foundation can reduce the uncoordinated deformation caused by welding shrinkage.

[0042] And the installation and welding of the lower flange plate are carried out after the full-penetration fillet weld of the tower leg support leg embedded parts is welded and the non-destructive testing is qualified, which is convenient for welding and ensures the quality of the full penetration of the tower leg embedded parts welding, can improve the one-time welding qualification rate of the tower leg support leg embedded parts, and reduce the adverse impact of the secondary repair of the weld on the structural quality.

[0043] Preferably, before step S06, the vertical support pipe of the tower crane standard section is installed by inserting pins corresponding to the tower leg support leg embedded parts.

[0044] During the whole process of in-factory manufacturing, hoisting and transportation, and on-site installation of the overall foundation, the tower crane standard section is always installed by inserting pins on the tower leg support leg embedded parts and cannot be separated, so as to maintain the through-hole rate of the tower leg support leg embedded parts and the tower crane standard section.

[0045] To sum up, due to the adoption of the above technical solutions, the beneficial effects of the present invention are:

[0046] 1. The tower crane foundation for the steel pipe arch bridge of the present invention can weld the base to the upper chord pipe of the main arch rib by welding. The main cross beam of the overall foundation is welded to the top of the base, the tower leg embedded part is welded to the main cross beam, and the vertical support pipe of the tower crane standard section is installed through the tower leg embedded part, which can ensure that the load can be evenly transmitted to the upper chord pipe of the main arch rib after the tower crane is installed, ensuring the operation safety of the tower crane on the steel pipe arch bridge. Moreover, the overall foundation is a prefabricated steel member, which can reduce the installation amount and welding amount of the tower crane foundation construction on the steel pipe arch bridge, that is, reduce the high-altitude operation, make the construction simpler and the welding quality better. By controlling the levelness and verticality of the base and the overall foundation, it is convenient to control the installation accuracy of the tower leg embedded part, so that the tower crane foundation for the steel pipe arch bridge of the present application can be applicable to high-altitude operation environments such as on the arch bridge.

[0047] 2. The tower crane foundation for the steel pipe arch bridge of the present invention, the base includes a steel pipe base on the arch crown side, a steel pipe base on the arch foot side and a heightening section. The steel pipe bases on the arch crown side and the arch foot side can adopt the same components, which is convenient for processing and use; by setting a heightening section above the steel pipe base on the arch foot side, when positioning and installing the steel pipe bases on the arch crown side and the arch foot side, the heightening section can be cut according to the actual situation after installation, reducing errors and avoiding later corrections, so that the support of the arch foot side and the arch crown side of the base to the overall foundation can be on the same horizontal plane, ensuring the levelness and verticality of the tower crane after installation, and thus ensuring the use safety of the tower crane. Moreover, the steel pipe base on the arch crown side, the steel pipe base on the arch foot side and the heightening section are all filled with concrete, which can increase the strength, stiffness, anti-pulling and anti-overturning characteristics of the tower crane foundation.

[0048] 3. The construction method of the tower crane foundation for the steel pipe arch bridge of the present invention, welding the base to the upper chord pipe of the steel pipe arch bridge and ensuring the corresponding accuracy, laying the foundation for the convenience and installation accuracy of the subsequent overall foundation installation. The overall foundation adopts prefabricated steel members in the factory, with higher accuracy, and can reduce the high-altitude welding operation on the arch, and its installation is easier, which can better ensure the installation accuracy of the tower crane foundation.

[0049] 4. The construction method of the tower crane foundation for the steel pipe arch bridge of the present invention, cutting the heightening section according to the actual installation situation of the steel pipe bases on the arch crown side and the arch foot side on the upper chord pipe of the arch, and then being able to ensure the levelness of the support surface of the base to the upper overall foundation; and guiding the installation of the heightening section through the positioning plate at the top of the steel pipe base on the arch foot side, which is beneficial to quickly and accurately ensure the installation of the heightening section in place, can reduce the installation difficulty and improve the installation efficiency.

[0050] 5. The construction method of the tower crane foundation for the steel pipe arch bridge of the present invention, by setting a support steel plate and a jack between the steel pipe base on the arch foot side and the heightening section, the top elevation of the heightening section can be adjusted by using the support of the steel pipe base on the arch foot side, which is beneficial to improving the installation accuracy.

[0051] 6. The construction method of the tower crane foundation for the steel pipe arch bridge according to the present invention is to symmetrically weld all welds from the middle of the overall foundation to both ends, which can reduce the uncoordinated deformation caused by welding shrinkage. The installation and welding of the lower flange plate of the main cross beam are carried out after the penetration fillet weld of the tower leg embedded part is welded and the non-destructive testing is qualified, which is convenient for welding and ensures the welding penetration quality of the tower leg embedded part, can improve the one-time welding qualification rate of the tower leg embedded part, and reduce the adverse impact on the structural quality caused by the secondary repair of the weld.

[0052] 7. In the whole process of in-factory manufacturing, hoisting and transportation, and on-site installation of the overall foundation of the tower crane foundation for the steel pipe arch bridge according to the present invention, the tower crane standard sections are all installed through pins on the tower leg embedded parts and cannot be separated, maintaining the through-hole rate of the tower leg embedded parts and the tower crane standard sections. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 is the elevation view of the tower crane foundation structure for the steel pipe arch bridge of the present invention;

[0054] Figure 2 is the top view of the tower crane foundation structure for the steel pipe arch bridge of the present invention;

[0055] Figure 3 is the side view of the cross-section where the first support beam of the tower crane foundation structure for the steel pipe arch bridge of the present invention is located;

[0056] Figure 4 is the top view of the overall foundation;

[0057] Figure 5 is the front view of the overall foundation;

[0058] Figure 6 is the side view of the overall foundation;

[0059] Figure 7 is the installation diagram of the steel pipe base on the arch top side and the steel pipe base on the arch foot side;

[0060] Figure 8 is the installation diagram of the heightening section;

[0061] Figure 9 is the diagram of the installation of the main cross beam of the overall foundation in the installation groove;

[0062] Figure 10 is to simultaneously pour the concrete in the base and the concrete in the chord tube;

[0063] Figure 11 is the side elevation diagram of the tower crane on the arch of the steel pipe arch bridge;

[0064] Figure 12It is a plan view of the overall foundation on the arch of a steel pipe arch bridge;

[0065] Figure 13 It is a schematic diagram of the installation of the heightening section when a jack is provided;

[0066] Figure 14 It is a schematic diagram of the installation of the main cross beam of the overall foundation in the installation groove when a jack is provided.

[0067] Icon: 1 - Base; 11 - Steel pipe base on the arch top side; 111 - First installation groove; 12 - Steel pipe base on the arch foot side; 13 - Heightening section; 131 - Second installation groove; 14 - Third stiffening plate; 15 - First stiffening plate; 16 - Concrete in the base; 2 - Overall foundation; 21 - Main cross beam; 211 - Upper flange plate; 212 - Lower flange plate; 213 - Web; 22 - Tower foot leg embedded part; 23 - First support beam; 24 - Second support beam; 25 - Second stiffening plate; 26 - Weld shrinkage space; 31 - Upper chord tube; 32 - Concrete in the chord tube; 41 - Positioning plate; 5 - Arch; 6 - Tower crane; 7 - Jack; 71 - Support steel plate. Detailed implementation manners

[0068] The present invention will be described in detail below with reference to the accompanying drawings.

[0069] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0070] Embodiment 1

[0071] This embodiment provides a tower crane foundation for a steel pipe arch bridge. Refer to Figures 1 - 3 and Figure 11 and Figure 12 , which includes a base 1 located at the lower part and an overall foundation 2 located at the upper part. The overall foundation 2 is a prefabricated steel member, which can reduce the installation amount and welding amount of the tower crane foundation during the construction of the steel pipe arch bridge, that is, reduce the high-altitude operation, make the construction simpler and the welding quality better, so that the tower crane foundation for the steel pipe arch bridge of the present application can be applicable to high-altitude operation environments such as on the arch bridge. The overall foundation 2 includes a main cross beam 21 and a tower foot leg embedded part 22. The tower foot leg embedded part 22 is welded to the main cross beam 21, and the tower foot leg embedded part 22 is used to connect the vertical support pipe of the tower crane standard section; the base 1 is used to be welded to the upper chord tube 31 of the steel pipe arch bridge, and the main cross beam 21 is welded above the base 1.

[0072] In this solution, the tower foot support leg embedded parts 22 are connected upward to the tower crane 6, directly bearing the upper load, and transferring the load of the tower crane 6 to the main crossbeam 21. The main crossbeam 21 serves as the main load-bearing structure of the tower crane foundation and as the installation position of the tower foot support leg embedded parts 22, strengthening the connection between the upper structure and the arch rib, bearing the upper load, and being able to maintain integrity under the action of external loads, and effectively transferring the external load to the base 1, and then effectively transferring it to the upper chord tube 31 of the main arch rib.

[0073] By adopting the tower crane foundation for the steel tube arch bridge, the base 1 can be welded to the upper chord tube 31 of the main arch rib by welding, the main crossbeam 21 of the integral foundation 2 is welded to the top of the base 1, the tower foot leg embedded parts 22 are welded to the main crossbeam 21, and the vertical support pipe of the tower crane standard section is installed through the tower foot leg embedded parts 22. It can be ensured that after the tower crane 6 is installed, the load can be evenly transferred to the upper chord tube 31 of the main arch rib, thereby ensuring the safety of the tower crane 6 in operation on the steel tube arch bridge. Figure 11 and Figure 12 shown.

[0074] By using the tower crane foundation for the steel tube arch bridge described in this embodiment, the tower crane foundation can be installed on the upper chord tube 31 of the steel tube arch bridge, and then the tower crane 6 can be installed on the tower crane foundation. Figure 11 and Figure 12 , so that the tower crane can be used safely on the arch 5. In addition, in high-altitude working environments such as arch bridges, the traditional ground tower crane foundation installation method is no longer applicable. Compared with the direct installation of the tower foot support leg embedded parts 22, which makes it difficult to adjust the horizontality and verticality, has a large number of welds, and is difficult to control welding deformation, the tower foot support leg embedded parts 22 are set on the integral foundation 2. The integral foundation 2 is a prefabricated steel component, processed in the factory, and installed on the arch 5 as a whole on site. It has the advantages of convenient construction, accurate and fast positioning, fast leveling, and high precision. At the same time, it avoids the problem of high-altitude welding workload causing difficult to control welding shrinkage deformation and adverse effects on the strength, rigidity, stability, and durability of the tower crane 6, and plays a good and positive role in reducing manual workload, lowering installation costs, improving precision, and shortening construction period.

[0075] Example 2

[0076] This embodiment provides a tower crane foundation for a steel tube arch bridge, which is more specific than that of embodiment 1. Figures 1 - 6 The horizontal direction of the arch bridge is Figure 2 The left and right directions of the arch bridge are Figure 1 The left and right directions; Figure 3 As shown, the right side is the arch top side and the left side is the arch foot side.

[0077] In this embodiment, Figures 4 - 6As shown in the figure, the overall foundation 2 includes two main cross beams 21. Both of the two main cross beams 21 are arranged along the transverse direction of the steel pipe arch bridge. The distance between the two main cross beams 21 is adapted to the width of the tower crane standard section. Two main cross beams 21 are arranged along the longitudinal direction of the steel pipe arch bridge, corresponding to the vertical support pipes of the tower crane standard section. Compared with setting a whole plate, it is lighter in weight and more convenient to arrange on the arch. A first support beam 23 and a second support beam 24 are connected between the two main cross beams 21. The two ends of the first support beam 23 are arranged corresponding to two longitudinally adjacent tower leg embedded parts 22 of the steel pipe arch bridge. The first support beam 23 strengthens the connection between the main cross beam 21 and the tower leg embedded part 22, and at the same time connects the two main cross beams 21 to ensure the integrity of the overall foundation 2; the two ends of the second support beam 24 are arranged corresponding to the connection positions of the two main cross beams 21 and the base 1; the second support beam 24 strengthens the connection positions of the main cross beam 21 and the base 1, and at the same time connects the two main cross beams 21 to ensure the integrity of the overall foundation 2; through the horizontally arranged first support beam 23 and second support beam 24, as Figure 2 and Figure 3 shown, it can transfer loads, enhance the stiffness and overall stability of the tower crane foundation.

[0078] As Figures 1 - 3 shown, the base 1 includes two arch crown side steel pipe bases 11 and two arch foot side steel pipe bases 12. The two arch crown side steel pipe bases 11 are located on the cross section of the main cross beam 21 on the corresponding arch crown side of the steel pipe arch bridge, and the two arch foot side steel pipe bases 12 are located on the cross section of the main cross beam 21 on the corresponding arch foot side of the steel pipe arch bridge. The arch crown side steel pipe base 11 and the arch foot side steel pipe base 12 are respectively welded to the corresponding upper chord pipes 31. The base 1 is stably supported on the two upper chord pipes 31 through the two arch crown side steel pipe bases 11 and the two arch foot side steel pipe bases 12. The two arch foot side steel pipe bases 12 stably support the main cross beam 21 on the arch foot side on the two upper chord pipes 31. Compared with setting it as a whole, it is lighter in weight and more convenient to arrange on the arch. The arch crown side steel pipe base 11 and the arch foot side steel pipe base 12 are both filled with concrete to form the concrete inside the base 16. As Figure 10 shown, it can increase the strength, stiffness, anti-pulling and anti-overturning characteristics of the tower crane foundation. Ensure the safe use of the tower crane. In addition, the concrete inside the arch crown side steel pipe base 11 and the arch foot side steel pipe base 12 has the same concrete grade as the concrete inside the upper chord pipe 31. As Figure 10 shown, such as the concrete inside the base 16 and the concrete inside the chord pipe 32 both adopt C 80 micro-expansion self-compacting compensated shrinkage concrete, which is convenient to pump the concrete inside the arch crown side steel pipe base 11 and the arch foot side steel pipe base 12 together when pumping the concrete inside the upper chord pipe 31, and the operation is more convenient, which is beneficial to the convenience of high-altitude tower crane construction.

[0079] Using the pedestal 1 and the integral foundation 2 described in this embodiment, the weight is lighter, transportation and hoisting are more convenient, the installation effect on the arch is better, and the safety of the tower crane used on the arch is improved.

[0080] In this embodiment, the first support beam 23 is a rectangular support beam, which is connected to the upper part of the main cross beam 21. As Figure 10 shown, it is beneficial to quickly transfer and evenly distribute the force on the tower foot to the pedestal and the arch rib. There is a pedestal constraint at the lower part of the main cross beam 21, and the lower part has a relatively large stiffness. The rectangular cross beam has a relatively strong bending stiffness, and the installation position is relatively high, enhancing the stiffness of the upper part. The second support beam 24 is a steel pipe support beam. Installing the steel pipe support beam in the middle of the structure is beneficial to increasing the structural stability. As Figure 9 shown.

[0081] As Figure 5 shown, the main cross beam 21 is a box-shaped cross beam. The box-shaped cross beam includes an upper flange plate 211, a lower flange plate 212, and two webs 213 located between the upper flange plate 211 and the lower flange plate 212. Second stiffening plates 25 are welded outside the two webs 213 on both sides of the main cross beam to strengthen the webs 213 of the main cross beam. And as Figure 9 shown, the rectangular cross beam can also adopt the same structural form as the box-shaped cross beam, having a rectangular cross beam top cover plate, a rectangular cross beam web, and a rectangular cross beam bottom cover plate. And the rectangular cross beam top cover plate is at the same elevation as the upper flange plate 211 and is welded. The lower flange plates 212 are respectively adopted in the lower parts of the structures of the two main cross beams 21. When considering the installation of the tower crane foundation on the arch bridge, in order to solve the problem of different slopes, by erecting steel pipe pedestals with different heights on the arch foot side and the arch top side, the tower crane foundation is convenient for adjustment and installation.

[0082] In this embodiment, between the steel pipe pedestal 11 on the arch top side and the upper chord pipe 31, and between the steel pipe pedestal 12 on the arch foot side and the upper chord pipe 31, a full penetration welding form is adopted to ensure that the two are integrated; and between the steel pipe pedestal 11 on the arch top side and the upper chord pipe 31, and between the steel pipe pedestal 12 on the arch foot side and the upper chord pipe 31, welding is respectively carried out through third stiffening plates 14 to further improve the connection stability; between the steel pipe pedestal 11 on the arch top side and the corresponding main cross beam 21, and between the steel pipe pedestal 12 on the arch foot side and the corresponding main cross beam 21, welding is also carried out through first stiffening plates 15 to further improve the connection stability.

[0083] Embodiment 3

[0084] This embodiment provides a tower crane foundation for a steel pipe arch bridge. Compared with the tower crane foundation for a steel pipe arch bridge in Embodiment 2, the pedestal 1 is different. Refer to Figures 7 - 10 .

[0085] In this embodiment, the base 1 includes two vault-side steel pipe bases 11 and two arch-foot-side steel pipe bases 12; and heightening sections 13 are provided on both of the two arch-foot-side steel pipe bases 12 of the base 1.

[0086] In this embodiment, as Figure 7 shown, the vault-side steel pipe base 11 and the arch-foot-side steel pipe base 12 have the same self-height, and the vault-side steel pipe base 11 and the arch-foot-side steel pipe base 12 can adopt the same components, which is convenient for processing and use.

[0087] As Figure 8 shown, a heightening section 13 is further connected above the arch-foot-side steel pipe base 12. The lower end of the heightening section 13 is welded to the upper end of the arch-foot-side steel pipe base 12, the top of the heightening section 13 is at the same elevation as the top of the vault-side steel pipe base 11, and the heightening section 13 is filled with concrete. By arranging the heightening section 13 above the arch-foot-side steel pipe base 12, when positioning and installing the vault-side steel pipe base 11 and the arch-foot-side steel pipe base 12, the heightening section 13 can be cut according to the actual situation after installation, reducing errors and avoiding later correction, so that the support of the arch-foot side and the vault side of the base on the overall foundation 2 can be on the same horizontal plane, ensuring the levelness and verticality of the tower crane after installation, and thus ensuring the safe use of the tower crane.

[0088] As Figure 9 shown, both the heightening section 13 and the top of the vault-side steel pipe base 11 have installation grooves. The installation groove of the heightening section 13 is the second installation groove 113, and the installation groove of the top-side steel pipe base 11 is the first installation groove 111. Both ends of the main beam 21 are welded in the installation grooves of the two heightening sections 13 or welded in the installation grooves of the two vault-side steel pipe bases 11. Both ends of the main beam 21 on the vault side are welded in the first installation grooves of the two vault-side steel pipe bases 11, and both ends of the main beam 21 on the arch-foot side are welded in the second installation grooves of the two heightening sections 13. By arranging the installation grooves, it is convenient to position and limit the installation position of the main beam 21, and it is also convenient for subsequent pouring of the concrete 16 in the base. And the main beam 21 is limited by the installation groove, making the use of the tower crane 6 safer. In Embodiment 2, installation grooves can also be provided on the vault-side steel pipe base 11 and the arch-foot-side steel pipe base 12. The self-height of the vault-side steel pipe base 11 is lower than the self-height of the arch-foot-side steel pipe base 12, so that the top elevation of the arch-foot-side steel pipe base 12 is flush with the top elevation of the vault-side steel pipe base 11, ensuring the installation accuracy of the upper overall foundation 2.

[0089] Except for this, in this embodiment, between the steel pipe base 11 on the vault side and the upper chord pipe 31, and between the steel pipe base 12 on the arch foot side and the upper chord pipe 31, a full penetration welding form is adopted to ensure that the two are integrated; and between the steel pipe base 11 on the vault side and the upper chord pipe 31, and between the steel pipe base 12 on the arch foot side and the upper chord pipe 31, they are respectively welded by the third stiffening plate 14 to further improve the connection stability; between the steel pipe base 11 on the vault side and the corresponding main cross beam, and between the heightened section and the corresponding main cross beam, they are also welded by the first stiffening plate 15 to further improve the connection stability; second stiffening plates 25 are welded outside the webs 213 on both sides of the main cross beam to strengthen the webs 213 of the main cross beam.

[0090] Embodiment 4

[0091] This embodiment provides a construction method for a tower crane foundation for a steel pipe arch bridge, which is used for constructing the tower crane foundation for the steel pipe arch bridge according to any one of Embodiments 1-3, and includes the following construction steps:

[0092] S1. Weld the base 1 to the upper chord pipe 31 of the steel pipe arch bridge and ensure that the elevations of the parts where the base 1 is connected to the overall foundation 2 are equal;

[0093] S2. Weld the main cross beam 21 of the overall foundation 2 to the top of the base 1 so that the elevations of all tower leg embedded parts 22 are equal.

[0094] Adopting the above construction method for the tower crane foundation of the steel pipe arch bridge, welding the base 1 to the upper chord pipe 31 of the steel pipe arch bridge and ensuring the corresponding accuracy, laying a foundation for the convenience and installation accuracy of the subsequent installation of the overall foundation 2. The overall foundation 2 adopts factory prefabricated steel components, with higher accuracy, and can reduce the high-altitude welding operation on the arch, and its installation is easier, and can better ensure the installation accuracy of the tower crane foundation.

[0095] Embodiment 5

[0096] This embodiment provides a construction method for a tower crane foundation for a steel pipe arch bridge. On the basis of Embodiment 4, when constructing the tower crane foundation for the steel pipe arch bridge described in Embodiment 3:

[0097] Step S1 includes the following construction steps:

[0098] S1A. Position, install and weld the steel pipe base 11 on the vault side and the steel pipe base 12 on the arch foot side on the corresponding upper chord pipe 31, and a positioning plate 41 is welded to the top of the steel pipe base 12 on the arch foot side, as Figure 7 shown;

[0099] S1B. Measure the top elevations of the steel pipe bases 11 on the vault side and 12 on the arch springing side. Then, cut and match the heightening section 13 according to the elevation difference between the steel pipe base 12 on the arch springing side and the steel pipe base 11 on the vault side. Next, install the heightening section 13 on the top of the steel pipe base 12 on the arch springing side through the positioning and guiding of the positioning plate 41, as shown in Figure 8 shown;

[0100] In step S2, embed the main cross beam 21 of the integral foundation 2 into the installation groove of the steel pipe base 11 on the vault side or into the installation groove of the heightening section 13. Then, weld the main cross beam 21 to the steel pipe base 11 on the vault side or the heightening section 13, as shown in Figure 9 shown;

[0101] It also includes step S3. Pour concrete downward from the top of the heightening section 13 and the top of the steel pipe base 11 on the vault side, as shown in Figure 10 shown.

[0102] In this solution, the heightening section 13 is cut and matched according to the actual installation conditions of the steel pipe bases 11 on the vault side and 12 on the arch springing side on the upper chord pipe 31 of the arch, thereby being able to ensure the levelness of the supporting surface of the base for the upper integral foundation 2. And the heightening section 13 is installed with limit guiding through the positioning plate 41 on the top of the steel pipe base 12 on the arch springing side, which is conducive to quickly and accurately ensuring that the heightening section 13 is installed in place, can reduce the installation difficulty, and improve the installation efficiency. Pouring concrete downward from the top of the heightening section 13 and the top of the steel pipe base 11 on the vault side can utilize the gap between the installation groove and the main cross beam 21 to pour concrete, the pouring process is smoother, and after the concrete is formed, it can connect the main cross beam 21 and the base together, improving the connection strength.

[0103] And before step S2, support steel plates 71 can be welded correspondingly on the outer sides of the heightening section 13 and the steel pipe base 12 on the arch springing side. Fix the fixed end of the jack 7 to the support steel plate 71 of the steel pipe base 12 on the arch springing side, fix the movable end of the jack 7 to the support steel plate 71 of the heightening section 13, and then adjust the top elevation of the heightening section 13 through the jack 7, as shown in Figure 13 shown;

[0104] In step S2, after the main cross beam 21 of the integral foundation 2 is correspondingly embedded into the installation groove, first adjust the top elevation of the heightening section 13 through the jack 7 to make the top elevation of the heightening section 13 equal to the top elevation of the steel pipe base 11 on the vault side, as shown in Figure 14 shown, and then weld the main cross beam 21 to the steel pipe base 11 on the vault side or the heightening section 13 to form an integral body;

[0105] And between step S2 and step S3, the main cross beam 21 is welded to the arch top side steel pipe base 11 or the heightening section 13 through the first stiffening plate 15 to form an integral body, which can improve the connectivity and is beneficial to the safe use of the tower crane. By arranging the support steel plate 71 and the jack 7, the top elevation of the heightening section 13 can be adjusted by using the support of the arch foot side steel pipe base 12, which is beneficial to improving the installation accuracy.

[0106] In this embodiment, before step S2, it further includes the manufacturing step of the integral foundation 2:

[0107] S01. Position and assemble the four webs 213;

[0108] S02. Position and assemble the first support beam 23 and the second support beam 24 between the adjacent webs 213 of the two main cross beams 21, then check the assembly positions of the first support beam 23 and the second support beam 24, and then spot weld the corresponding welds;

[0109] S03. Position and assemble the second stiffening plates 25 on the outer sides of the webs 213 of the two main cross beams 21, and then spot weld the corresponding welds;

[0110] S04. Position and install the upper flange plate 211, and then spot weld the corresponding welds;

[0111] S05. Position and install the tower leg support leg embedded part 22, and then spot weld the corresponding welds;

[0112] S06. Weld all the welds symmetrically from the middle to both ends of the integral foundation 2; First, use the positioning point fixing method to ensure the connection between structures such as the web 213, the first support beam 23, the second support beam 24, the second stiffening plate 25, and the upper flange plate 211, so as to facilitate the subsequent welding operation. When welding, welding all the welds symmetrically from the middle to both ends of the integral foundation 2 can reduce the uncoordinated deformation caused by welding shrinkage.

[0113] Among them, in step S06, after the full penetration fillet weld of the tower leg support leg embedded part 22 is welded, the lower flange plate 212 is positioned, installed and welded. That is, the installation and welding of the lower flange plate 212 are carried out after the full penetration fillet weld of the tower leg support leg embedded part's 22 is welded and the non-destructive testing is qualified, which is convenient for welding and ensures the quality of the full penetration of the tower leg embedded part's welding, can improve the one-time welding qualification rate of the tower leg support leg embedded part 22, and reduce the adverse impact on the structural quality caused by the secondary repair of the weld.

[0114] And before step S06, the vertical support pipes of the tower crane standard section are correspondingly installed with pins on the tower leg support leg embedded part 22. During the whole process of in-factory manufacturing, hoisting and transportation, and on-site installation of the integral foundation 2, the tower crane standard section is always installed with pins on the tower leg support leg embedded part 22 and cannot be separated, so as to maintain the through-hole rate of the tower leg support leg embedded part 22 and the tower crane standard section.

[0115] Example 6

[0116] In the prior art, in the complex high-altitude working environment on the arch of an arch bridge, the levelness of the tower crane foundation support legs and the difficulty of the embedded parts of the tower foot support legs and the through holes of the tower crane standard sections make it impossible to install with high precision. The traditional on-ground tower crane foundation installation method is not applicable to the project, and it is difficult to ensure the precision of the welding of the embedded parts of the tower foot support legs on the arch. In view of the above problems, this embodiment provides a construction method for a tower crane foundation for a steel pipe arch bridge, which is a specific implementation method when implementing the tower crane foundation for the steel pipe arch bridge described in Embodiment 3: It solves the problems of difficult installation of the tower crane on the arch under the condition of no attachment and high-altitude working environment, unable to guarantee the welding quality, large welding workload resulting in difficult control of welding deformation, and difficult high-precision installation of the embedded parts of the tower foot support legs.

[0117] The construction method for a tower crane foundation for a steel pipe arch bridge provided in this embodiment mainly has the following process:

[0118] 1. Structural decomposition: Decompose the structure into parts such as the main cross beam, rectangular support beam (first support beam), steel pipe support beam (second support beam), embedded parts of the tower foot support legs, stiffening plates (second stiffening plate 25), etc., draw detailed part drawings, and cut the materials according to the drawings; Assemble each part into an integral foundation in the steel structure processing factory, as Figures 4 - 6 shown. During the whole process of in-factory manufacturing, hoisting and transportation, and on-site installation of the tower crane foundation, the tower crane standard sections are always fixed by inserting pins on the embedded parts of the tower foot support legs, which is beneficial to reducing welding deformation and matching throughout the process.

[0119] The structural decomposition and the production of the integral foundation include the following parts:

[0120] (1) Decompose the structure into parts: 2 box-shaped cross beams (main cross beam 21), 2 rectangular support beams (first support beam 23), 2 steel pipe support beams (second support beam 24); The 2 box-shaped cross beams (main cross beam 21) include 2 (lower flange plates 212, each lower flange plate 212 is composed of two bottom sealing plates), 2 top sealing plates (upper flange plates 211), 4 webs 213 and various stiffening plates (second stiffening plate 25) outside the webs 213; Draw detailed part drawings and cut the materials according to the drawings.

[0121] (2) Loft on a flat and solid concrete ground, draw each inspection line and projection line for lofting, and set up a special horizontal jig, and the horizontal jig can be processed by the prior art;

[0122] (3) Assemble according to the design drawings: ① Assemble the four webs 213 of the two box beams, and position the two middle webs 213 by temporary supports, that is, the two box beams are positioned by temporary supports; the two webs 213 of each box beam are constrained by jacks, supports, etc. to ensure the internal clearance of the box beam; ② Position the steel pipe support beam between the two box beams, assemble the rectangular support beam, and check whether the plane position of the rectangular support beam is accurate; ③ Position the stiffening plate; ④ Install the top cover plate, and firmly position it with the box beam and rectangular support beam through "7"-shaped code plates, spot welding, etc. During assembly, reserve a certain welding shrinkage allowance for the positions that need to be welded, such as Figure 5 As shown, there is a weld shrinkage space 26 between the second stiffening plate 25 and the web.

[0123] (4) Use the tower crane manufacturer's supporting tower leg embedded parts with pin holes, accurately adjust the plane position, verticality, and horizontality (±1mm) in the box beam, and then use spot welding and other positioning constraints to avoid improper installation of the tower leg embedded parts, which may seriously affect the use of the tower crane (such as tower body tilting, etc.).

[0124] (5) Fix the tower crane standard section through pins on the tower foot support leg embedded parts, and weld the tower crane foundation with the standard section to prevent welding deformation from causing changes in the geometric dimensions between the tower crane foundation support legs. Ensure the through-hole ratio of the tower crane standard section and the tower foot embedded support legs, that is, ensure the verticality, horizontality and geometric dimensions of the tower foot support leg embedded parts. In order to reduce the inharmonious deformation caused by welding shrinkage, the principle of "welding from the middle to the two ends and symmetrically" should be followed during welding. Welding sequence: With the line connecting the midpoints of the overall foundation as the axis of symmetry, two welders on each side shall symmetrically weld ① the fillet welds between the stiffening plate and the box beam; ② the fillet welds between the box beam and the rectangular support beam; ③ the fillet welds between the box beam and the steel pipe support beam; ④ after rotating the structure vertically 180°, place it on a horizontal dedicated cradle, and flat weld the fillet welds between the top cover plate and the web, the rectangular support beam, and the stiffening plate; ⑤ perform a bottom welding between the embedded parts of the tower leg and the web (inside) of the box beam, and weld the embedded parts of the tower leg and the web (outside) of the box beam after cleaning the root with an air gouging machine on the outside; ⑥ the fillet weld between the web of the box beam and the bottom cover plate.

[0125] 2. The steel pipe base is positioned and welded on the parallel arch upper chord tube. After cutting and adjusting the level, the overall foundation of the tower crane is embedded in the positioned steel pipe base and welded to the steel pipe base through the stiffening plate (first stiffening plate 15) to form a whole.

[0126] On-site installation of tower crane foundation:

[0127] (1) Use Q345C, D=711mm steel pipe base (arch side steel pipe base 11 and arch foot side steel pipe base 12) to position the upper chord tube. The arch foot side steel pipe base 12 needs to be welded with a positioning plate on the inside or outside to facilitate the docking of the steel pipes in the heightened section. The horizontal spacing between the arch top side steel pipe base 11 and the arch foot side steel pipe base 12 in the longitudinal direction of the arch bridge is 1.8m, which is suitable for the size of the tower crane. After positioning, the steel pipe base and the upper chord tube are fully welded to make the steel pipe base and the upper chord tube integrated.

[0128] (2) After the steel pipe base is installed, the heightened section is cut according to the actual height difference between the top of the arch top steel pipe base 11 and the top of the arch foot steel pipe base 12 measured on the arch. The heightened section is installed on the arch foot steel pipe base. Support steel plates are welded to the heightened section and the arch foot steel pipe base respectively. The height of the top of the heightened section is adjusted by a jack, as shown in the following example: Figure 13 As shown, the height difference is controlled within 2mm to ensure that the height difference, spacing and verticality meet the requirements.

[0129] (3) Position the overall foundation of the tower crane foundation and embed it into the installation groove above the arch side steel pipe base 11 and the heightened section 13, install it on the base, and use a jack to adjust the overall foundation top elevation to control the height difference within 2mm. After adjustment, weld and fix it;

[0130] (4) The first stiffening plate 15 is then used to weld the entire foundation and base of the tower crane into a whole. After the installation is completed, a steel pipe with the same strength as the main chord pipe is poured from both sides of the steel pipe base. C 80% micro-expansion self-compacting shrinkage-compensating concrete increases the strength, rigidity, pullout resistance, and overturning resistance of the tower crane foundation. Once the concrete strength reaches the required level, subsequent tower crane installation can proceed.

[0131] In this embodiment, during the entire process of tower crane foundation factory manufacturing, hoisting and transportation, and on-site installation, the tower crane standard section is pinned and installed on the tower foot leg embedded parts and cannot be detached, maintaining the through-hole ratio of the tower foot leg embedded parts and the tower crane standard section.

[0132] In high-altitude working environments such as arch bridges, traditional ground-based tower crane foundation installation methods are no longer applicable. Compared to the installation of the tower foot support leg embedded parts 22 directly on the arch, which results in difficulty in adjusting the horizontality and verticality, a large number of welds, and difficulty in controlling welding deformation, the construction method of the tower crane foundation for a steel pipe arch bridge described in this embodiment processes the tower crane foundation in the factory and installs it as a whole on site. This has the advantages of convenient construction, precise and rapid positioning, rapid leveling, and high precision. At the same time, it avoids the problem of high-altitude welding workload leading to difficult-to-control welding shrinkage deformation and adverse effects on the tower crane's strength, rigidity, stability, and durability, and plays a positive role in reducing manual workload, lowering installation costs, improving precision, and shortening construction periods.

[0133] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A tower crane foundation for a steel pipe arch bridge, characterized in that, It includes a base (1) and an integral foundation (2). The integral foundation (2) is a prefabricated steel member, which includes a main cross beam (21) and tower leg embedded parts (22). The tower leg embedded parts (22) are welded to the main cross beam (21), and the tower leg embedded parts (22) are used to connect the vertical support pipes of the tower crane standard section. The base (1) is used to be welded to the upper chord pipe (31) of the steel pipe arch bridge, and the main cross beam (21) is welded above the base (1). The number of the main cross beams (21) is two, and both of the two main cross beams (21) are arranged along the transverse direction of the steel pipe arch bridge. The distance between the two main cross beams (21) is adapted to the width of the tower crane standard section. A first support beam (23) and a second support beam (24) are connected between the two main cross beams (21). The two ends of the first support beam (23) are arranged corresponding to two longitudinally adjacent tower leg embedded parts (22) of the steel pipe arch bridge, and the two ends of the second support beam (24) are arranged corresponding to the connection positions of the two main cross beams (21) and the base (1). The base (1) includes two arch crown side steel pipe bases (11) and two arch foot side steel pipe bases (12). The two arch crown side steel pipe bases (11) are located on the cross section of the steel pipe arch bridge corresponding to one of the main cross beams (21), and the two arch foot side steel pipe bases (12) are located on the cross section of the steel pipe arch bridge corresponding to the other main cross beam (21). The arch crown side steel pipe bases (11) and the arch foot side steel pipe bases (12) are respectively welded to the corresponding upper chord pipes (31), and the interiors of the arch crown side steel pipe bases (11) and the arch foot side steel pipe bases (12) are filled with concrete. The self - heights of the arch crown side steel pipe base (11) and the arch foot side steel pipe base (12) are the same. An extension section (13) is also connected above the arch foot side steel pipe base (12). The lower end of the extension section (13) is welded to the upper end of the arch foot side steel pipe base (12), and the top elevation of the extension section (13) is equal to the top elevation of the arch crown side steel pipe base (11). The extension section (13) is filled with concrete.

2. The tower crane foundation for a steel pipe arch bridge according to claim 1, wherein, The concrete inside the arch crown side steel pipe base (11) and the arch foot side steel pipe base (12) has the same concrete grade as that inside the upper chord pipe (31).

3. The tower crane foundation for a steel pipe arch bridge according to claim 1, characterized in that, Both the top of the extension section (13) and the top of the arch crown side steel pipe base (11) have installation grooves, and the two ends of the main cross beam (21) are welded in the installation grooves of the two extension sections (13) or welded in the installation grooves of the two arch crown side steel pipe bases (11).

4. A construction method for a tower crane foundation used for a steel pipe arch bridge, characterized in that, The tower crane foundation for constructing the steel pipe arch bridge as described in claim 3 includes the following construction steps: S1. Weld the base (1) to the upper chord pipe (31) of the steel pipe arch bridge and ensure that the elevation of the part where the base (1) connects to the integral foundation (2) is equal. Step S1 includes the following construction steps: S1A. Position, install and weld the arch crown side steel pipe base (11) and the arch foot side steel pipe base (12) on the corresponding upper chord pipe (31), and a positioning plate (41) is welded to the top of the arch foot side steel pipe base (12). S1B. Measure the top elevations of the steel pipe bases (11) on the vault side and the steel pipe bases (12) on the arch foot side. Then, cut and add the heightening section (13) according to the elevation difference between the measured steel pipe bases (12) on the arch foot side and the steel pipe bases (11) on the vault side. Next, install the heightening section (13) on the top of the steel pipe bases (12) on the arch foot side through the positioning and guiding of the positioning plate (41). S2. Weld the main cross beams (21) of the integral foundation (2) to the top of the base (1) so that the elevations of all the tower foot leg embedded parts (22) are equal. In step S2, correspondingly embed the main cross beams (21) of the integral foundation (2) into the installation grooves of the steel pipe bases (11) on the vault side or into the installation grooves of the heightening section (13). Then, weld the main cross beams (21) to the steel pipe bases (11) on the vault side or the heightening section (13). It also includes step S3. Pour concrete downward from the top of the heightening section (13) or the top of the steel pipe bases (11) on the vault side.

5. The construction method of the tower crane foundation for the steel pipe arch bridge according to claim 4, characterized in that, Before step S2, support steel plates (71) are welded correspondingly on the outer sides of the heightening section (13) and the steel pipe bases (12) on the arch foot side. Fix the fixed end of the jack (7) on the support steel plate (71) of the steel pipe bases (12) on the arch foot side, and fix the movable end of the jack (7) on the support steel plate (71) of the heightening section (13). Then, adjust the top elevation of the heightening section (13) through the jack (7). In step S2, after correspondingly embedding the main cross beams (21) of the integral foundation (2) into the installation grooves, first adjust the top elevation of the heightening section (13) through the jack (7) so that the top elevation of the heightening section (13) is equal to the top elevation of the steel pipe bases (11) on the vault side. Then, weld the main cross beams (21) to the steel pipe bases (11) on the vault side or the heightening section (13) to form an integral body. Between step S2 and step S3, weld the main cross beams (21) to the steel pipe bases (11) on the vault side or the heightening section (13) to form an integral body through the first stiffening plate (15).

6. The construction method of the tower crane foundation for the steel pipe arch bridge according to any one of claims 4-5, characterized in that, The integral foundation (2) includes two main cross beams (21). The main cross beams (21) are box-shaped cross beams. The box-shaped cross beams include upper flange plates (211), lower flange plates (212), and two webs (213) located between the upper flange plates (211) and the lower flange plates (212). Before step S2, it also includes the manufacturing steps of the integral foundation (2): S01. Position and assemble the four webs (213). S02. Position and assemble the first support beam (23) and the second support beam (24) between the adjacent webs (213) of the two main cross beams (21). Then, check the assembly positions of the first support beam (23) and the second support beam (24), and then spot weld the corresponding welds. S03. Position and assemble the second stiffening plates (25) on the outer sides of the webs (213) of the two main cross beams (21), and then spot weld the corresponding welds. S04. Position and install the upper flange plates (211), and then spot weld the corresponding welds. S05. Position and install the tower foot leg embedded parts (22), and then spot weld the corresponding welds. S06. Weld all the welds symmetrically from the middle to both ends of the integral foundation (2). Among them, in step S06, after the full-penetration fillet weld of the tower leg support embedded part (22) is completed, the lower flange plate (212) is positioned, installed and welded.

7. The construction method of the tower crane foundation for the steel pipe arch bridge according to claim 6, characterized in that, Before step S06, the vertical support pipes of the tower crane standard section are installed with corresponding pins on the tower leg support embedded part (22).

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