A hoisting method for matching high and low spans of steel structures

Abstract

The present application relates to the technical field of building component hoisting, in particular to a steel structure high-low span matching hoisting method, comprising the following steps: S10, first temporary support mechanism and second temporary support mechanism are arranged on both sides of the transfer support column; S20, first steel span structure and second steel span structure are hoisted respectively, so that one end of the first steel span structure is supported on the top end of the first span support column and the other end is supported on the top end of the first temporary support mechanism, one end of the second steel span structure is supported on the top end of the second span support column and the other end is supported on the top end of the second temporary support mechanism; S30, the distance from the inner end of the first steel span structure to the first installation pile cap and the distance from the inner end of the second steel span structure to the second installation pile cap 12 are equal; S40, the inner ends of the first steel span structure and the second steel span structure are lowered at the same speed synchronously, so that the inner ends of the two structures fall on the corresponding first installation pile cap and second installation pile cap 12 at the same time, and are fixed. The present application can ensure that the stress at the high-low span transfer is balanced.

Description

Technical Field

[0001] This invention relates to the field of building component hoisting technology, specifically to a method for matching high and low spans of steel structures. Background Technology

[0002] Currently, the demand for steel structure factory buildings is increasing, and this field is developing rapidly. As a common form of industrial building, steel structure factory buildings are characterized by simple structure, short construction period, and strong load-bearing capacity, and are widely used in various industries. With the accelerated advancement of my country's industrialization and rapid economic development, the construction of steel structure factory buildings is continuously improving, providing important infrastructure support for industrial development.

[0003] Meanwhile, the number of steel structure factory building projects is constantly increasing, covering multiple fields such as industrial manufacturing, logistics warehousing, and commercial exhibitions. Government policies encouraging industrial development and an optimized economic environment have driven the rapid development of steel structure factory building construction. More and more enterprises and investors are recognizing the advantages of steel structure factory buildings, including rapid construction, cost control, and flexibility, thus leading to a continuous increase in demand in this field.

[0004] Many steel structure factory buildings have varying spans due to functional requirements. However, the stress at the junction of the high and low spans is complex, and the high and low spans cannot be hoisted synchronously during hoisting, resulting in uneven stress at the junction. This can easily cause the verticality of the joint support column to exceed the design range, posing a significant safety hazard. Summary of the Invention

[0005] To address the technical problem that existing steel structure factory building hoisting methods cannot achieve synchronous hoisting, resulting in uneven force distribution at the junction of high and low spans, this invention provides a steel structure high and low span matching hoisting method. This method enables the gravity of the high and low spans to act synchronously on the junction support column, ensuring balanced force distribution at the junction and maintaining good verticality of the junction support column, thereby ensuring the overall balance and stability of the structure.

[0006] This invention is achieved through the following technical solution:

[0007] This invention provides a method for matching high and low spans of steel structures during hoisting, comprising the following steps:

[0008] S10. A first temporary support mechanism and a second temporary support mechanism are respectively set on both sides of the junction support column. The first temporary support mechanism is located on the side of the junction support column directly opposite the first span support column, and the second temporary support mechanism is located on the side of the junction support column directly opposite the second span support column.

[0009] S20. The first steel span structure and the second steel span structure are hoisted respectively, so that one end of the first steel span structure is supported at the top of the first span support column and the other end is supported at the top of the first temporary support mechanism, and one end of the second steel span structure is supported at the top of the second span support column and the other end is supported at the top of the second temporary support mechanism.

[0010] S30. Adjust the distance L1 from the inner end of the first steel span structure to the first mounting platform of the connecting support column and the distance L2 from the inner end of the second steel span structure to the second mounting platform of the connecting support column, so that L1 equals L2.

[0011] S40. Simultaneously and at the same speed, lower the inner ends of the first and second steel span structures so that the inner ends of the first and second steel span structures simultaneously land on the corresponding first and second mounting platforms and are fixed.

[0012] In an optional embodiment of this application, the heights of both the first temporary support mechanism and the second temporary support mechanism are adjustable; in step S30, the distances from the inner end of the first steel span structure to the first mounting platform and from the inner end of the second steel span structure to the second mounting platform are adjusted respectively by adjusting the heights of the first temporary support mechanism and the second temporary support mechanism.

[0013] In an optional embodiment of this application, the first temporary support mechanism includes: a first support base supported on the side of the junction support column directly opposite the first span support column; a first hydraulic jack mounted on the first support base; and a first temporary support column mounted on the end of the first hydraulic jack away from the first support base.

[0014] In an optional embodiment of this application, the first support base is vertically provided with multiple first guide rods, which are evenly distributed around the outer circumference of the hydraulic jack, and the upper end of each first guide rod is slidably inserted into the lower end of the first temporary support.

[0015] In an optional embodiment of this application, the second temporary support mechanism includes: a second support base supported on the side of the junction support column directly opposite the second span support column; a second hydraulic jack mounted on the second support base; and a second temporary support column mounted on the end of the second hydraulic jack away from the second support base.

[0016] In an optional embodiment of this application, a first lowering hydraulic cylinder is provided at the top of the first temporary support. In step S20, one end of the first steel span structure is supported on the moving end of the first lowering hydraulic cylinder. A second lowering hydraulic cylinder is provided at the top of the second temporary support. In step S20, one end of the second steel span structure is supported on the moving end of the second lowering hydraulic cylinder. The first lowering hydraulic cylinder and the second lowering hydraulic cylinder are of the same specifications, and their drain ports are connected to a flow inlet valve of the same speed through pipes of the same specifications. In step S40, the first lowering hydraulic cylinder and the second lowering hydraulic cylinder are drained at the same speed through the flow inlet valve of the same speed, so as to lower the inner ends of the first steel span structure and the second steel span structure at the same speed.

[0017] In an optional embodiment of this application, the same-speed inlet valve includes: a valve body having a first valve chamber and a second valve chamber of the same specification, wherein the inlet of the first valve chamber is connected to the outlet of the first lowering hydraulic cylinder, and the inlet of the second valve chamber is connected to the outlet of the second lowering hydraulic cylinder; a first piston adapted to the first valve chamber; a second piston adapted to the second valve chamber; and a linear actuator connected to the first piston and the second piston respectively to drive the first piston and the second piston to move synchronously.

[0018] In an optional embodiment of this application, the same-speed inlet valve further includes a synchronizing seat, which is connected to the linear actuator, and the first piston and the second piston are rigidly connected to the synchronizing seat through corresponding first rigid support rods and second rigid support rods, respectively.

[0019] In an optional embodiment of this application, the valve body is mounted on the first temporary support, and the synchronization seat is slidably mounted on the first temporary support.

[0020] In an optional embodiment of this application, the linear driver is a lead screw mechanism driven by a motor, and the lead screw of the linear driver is screwed to the synchronizing seat.

[0021] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0022] The steel structure high-low span matching hoisting method provided by this invention first sets up a first temporary support mechanism and a second temporary support mechanism on both sides of the junction support column, and then hoists the first steel span structure and the second steel span structure respectively, so that the first steel span structure is erected on the top of the first span support column and the first temporary support mechanism, and the second steel span structure is erected on the top of the second span support column and the second temporary support mechanism. Then, the distance from the inner end of the first steel span structure to the first mounting platform of the junction support column and the distance from the inner end of the second steel span structure to the second mounting platform of the junction support column are the same. Finally, the inner ends of the first steel span structure and the second steel span structure are lowered synchronously and at the same speed, so that the inner ends of the first steel span structure and the second steel span structure land on the corresponding first mounting platform and second mounting platform at the same time. This ensures that the gravity of the high and low spans acts synchronously on the junction support column, ensuring that the force at the junction of the high and low spans is balanced, and that the junction support column maintains good verticality, thereby ensuring the overall balance and stability of the structure. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] In the attached diagram:

[0025] Figure 1 A schematic flowchart of the steel structure high-low span matching hoisting method provided in an embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of the structure after the first steel span structure and the second steel span structure are lifted and supported onto the corresponding support structure in the steel structure high-low span matching hoisting method provided in the embodiment of the present invention.

[0027] Figure 3 A schematic diagram of the structure of the first temporary support mechanism provided in an embodiment of the present invention;

[0028] Figure 4 This is a schematic diagram of the structure of the second temporary support mechanism provided in an embodiment of the present invention;

[0029] Figure 5 This is a schematic diagram of the same-speed inlet valve provided in an embodiment of the present invention.

[0030] The attached figures include reference numerals and their corresponding component names:

[0031] 10-Connection support column, 11-First mounting base, 12-Second mounting base;

[0032] 20-First temporary support mechanism, 21-First support base, 22-First hydraulic jack, 23-First temporary support column, 24-First guide rod, 25-First lowering hydraulic cylinder;

[0033] 30-Second temporary support mechanism, 31-Second support base, 32-Second hydraulic jack, 33-Second temporary support column, 34-Second guide rod, 35-Second lowering hydraulic cylinder;

[0034] 40 - First span support column;

[0035] 50 - Second span support column;

[0036] 60 - First steel span structure;

[0037] 70 - Second steel span structure;

[0038] 80-Same-speed inlet valve, 81-Valve body, 82-First valve chamber, 83-Second valve chamber, 84-First piston, 85-Second piston, 86-Linear actuator, 87-Synchronizer seat, 88-First rigid support rod, 89-Second rigid support rod. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0041] It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0042] In the description of the embodiments of this application, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the product of this application is usually placed in when in use, or the orientation or positional relationship that is commonly understood by those skilled in the art. It is only for the convenience of describing this application and simplifying the description, and is not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.

[0043] In the description of this application, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0044] Example

[0045] Combination Figure 1 and Figure 2 This embodiment provides a method for matching high and low spans of steel structures for hoisting, including the following steps:

[0046] S10. A first temporary support mechanism 20 and a second temporary support mechanism 30 are respectively set on both sides of the junction support column 10. The first temporary support mechanism 20 is located on the side of the junction support column 10 facing the first span support column 40, and the second temporary support mechanism 30 is located on the side of the junction support column 10 facing the second span support column 50.

[0047] Specifically, before hoisting the steel spans, a first span support column 40 for supporting the first steel span structure 60 and a second span support column 50 for supporting the second steel span structure 70 were constructed on the corresponding site. The junction support column 10 is located between the corresponding first span support column 40 and second span support column 50. The first temporary support mechanism 20 and the second temporary support mechanism 30 are correspondingly set with the first span support column 40 and the second span support column 50. Furthermore, a first mounting platform for installing the inner end of the first steel span structure 60 and a second mounting platform for installing the inner end of the second steel span structure 70 are provided on the corresponding side of the junction support column 10.

[0048] The heights of both the first temporary support mechanism 20 and the second temporary support mechanism 30 are adjustable, allowing for direct and rapid adjustment of the height of the inner ends of the two steel span structures. Generally, the first temporary support mechanism 20 and the second temporary support mechanism 30 have the same structure.

[0049] Combination Figure 3The first temporary support mechanism 20 includes: a first support base 21, supported on the side of the junction support column 10 directly opposite the first span support column 40; a first hydraulic jack 22, mounted on the first support base 21; and a first temporary support column 23, mounted on the end of the first hydraulic jack 22 away from the first support base 21, thereby adjusting the height of the top of the first temporary support mechanism 20 by controlling the extension and retraction of the first hydraulic jack 22.

[0050] To ensure the stability of the first temporary support 23 during the extension and retraction of the first hydraulic jack 22, the first support base 21 is vertically provided with multiple first guide rods 24. The multiple first guide rods 24 are evenly distributed around the outer circumference of the hydraulic jack, and the upper end of each first guide rod 24 is slidably inserted into the lower end of the first temporary support 23. The stability of the first temporary support 23 during the extension and retraction of the first hydraulic jack 22 is improved through the sliding cooperation between the first guide rods 24 and the first temporary support 23.

[0051] Combination Figure 4 The second temporary support mechanism 30 includes: a second support base 31, supported on the side of the junction support column 10 facing the second span support column 50; a second hydraulic jack 32, mounted on the second support base 31; and a second temporary support column 33, mounted on the end of the second hydraulic jack 32 away from the second support base 31, thereby adjusting the height of the top of the second temporary support mechanism 30 by controlling the extension and retraction of the second hydraulic jack 32.

[0052] Based on this, a first lowering hydraulic cylinder 25 is provided at the top of the first temporary support 23, and a second lowering hydraulic cylinder 35 is provided at the top of the second temporary support 33. Simultaneously, the first lowering hydraulic cylinder 25 and the second lowering hydraulic cylinder 35 are of the same specification, and their drain ports are connected to a flow inlet valve 80 of the same speed via pipes of the same specification, ensuring that the tops of the first temporary support mechanism 20 and the second temporary support mechanism 30 can be lowered synchronously and at the same speed. This also facilitates the placement of the first lowering hydraulic cylinder 25 and the second lowering hydraulic cylinder 35 on their respective temporary supports, without being limited by the height difference between the two temporary supports.

[0053] Combination Figure 5The synchronous flow valve 80 includes: a valve body 81, with a first valve chamber 82 and a second valve chamber 83 of the same specification. The inlet of the first valve chamber 82 is connected to the outlet of the first lowering hydraulic cylinder 25, and the inlet of the second valve chamber 83 is connected to the outlet of the second lowering hydraulic cylinder 35; a first piston 84 adapted to the first valve chamber 82; a second piston 85 adapted to the second valve chamber 83; and a linear actuator 86, which is connected to the first piston 84 and the second piston 85 respectively to drive the first piston 84 and the second piston 85 to move synchronously, thereby ensuring the synchronicity of the movement of the first lowering hydraulic cylinder 25 and the second lowering hydraulic cylinder 35. Compared with the direct discharge method, the discharge speed is controllable, and it can also avoid the rapid drop of the inner end of the steel span structure due to equipment failure.

[0054] Furthermore, the same-speed inlet valve 80 also includes a synchronization seat 87, which is connected to the linear actuator 86. The first piston 84 and the second piston 85 are rigidly connected to the synchronization seat 87 through corresponding first rigid support rods 88 and second rigid support rods 89, respectively, to ensure the synchronicity of the movement of the first piston 84 and the second piston 85.

[0055] It is understood that the valve body 81 is mounted on the first temporary support 23, and the synchronization seat 87 is slidably mounted on the first temporary support 23.

[0056] In this embodiment, the linear driver 86 is a lead screw mechanism driven by a motor, and the lead screw of the linear driver 86 is screwed to the synchronous seat 87, which enables the linear driver 86 to achieve mechanical self-locking.

[0057] It should be noted that after the first temporary support mechanism 20 and the second temporary support mechanism 30 are installed, the first hydraulic jack 22, the second hydraulic jack 32, the first lowering hydraulic cylinder 25 and the second lowering hydraulic cylinder 35 should all be in a certain extended state. The top height of the first lowering hydraulic cylinder 25 should be higher than the first mounting platform 11, and the top height of the second lowering hydraulic cylinder 35 should be higher than the second mounting platform 12. This ensures that the distance L1 from the inner end of the first steel span structure 60 to the first mounting platform 11 of the connecting support column 10 and the distance L2 from the inner end of the second steel span structure 70 to the second mounting platform 12 of the connecting support column 10 can be adjusted to the same value, and the first lowering hydraulic cylinder 25 and the second lowering hydraulic cylinder 35 have sufficient lowering stroke.

[0058] S20. The first steel span structure 60 and the second steel span structure 70 are hoisted respectively, so that one end of the first steel span structure 60 is supported at the top of the first span support column 40 and the other end is supported at the top of the first temporary support mechanism 20, and one end of the second steel span structure 70 is supported at the top of the second span support column 50 and the other end is supported at the top of the second temporary support mechanism 30.

[0059] Specifically, one end of the first steel span structure 60 is supported on the moving end of the first lowering hydraulic cylinder 25, and one end of the second steel span structure 70 is supported on the moving end of the second lowering hydraulic cylinder 35. Support seats for bearing the inner ends of the steel span structures are hinged to the moving ends of both the first lowering hydraulic cylinder 25 and the second lowering hydraulic cylinder 35.

[0060] S30. Adjust the distance L1 from the inner end of the first steel span structure 60 to the first mounting platform 11 of the connecting support column 10, and the distance L2 from the inner end of the second steel span structure 70 to the second mounting platform 12 of the connecting support column 10, so that L1 equals L2.

[0061] Specifically, by controlling the extension and retraction of the first hydraulic jack 22 or the second hydraulic jack 32, the height of the first temporary support mechanism 20 and the second temporary support mechanism 30 are adjusted, thereby adjusting the distance from the inner end of the first steel span structure 60 to the first mounting platform 11 and the distance from the inner end of the second steel span structure 70 to the second mounting platform 12, respectively.

[0062] S40, simultaneously and at the same speed, lower the inner ends of the first steel span structure 60 and the second steel span structure 70 so that the inner ends of the first steel span structure 60 and the second steel span structure 70 simultaneously land on the corresponding first mounting platform 11 and the second mounting platform 12, and complete the fixing.

[0063] Specifically, the linear actuator 86 drives the synchronous seat 87 to move downwards, causing the first piston 84 and the second piston 85 to move downwards synchronously. This results in the hydraulic oil in the first lowering hydraulic cylinder 25 and the second lowering hydraulic cylinder 35 entering the corresponding first valve chamber 82 and second valve chamber 83 in equal amounts and at the same speed. Consequently, the same-speed inlet valve 80 discharges fluid from the first lowering hydraulic cylinder 25 and the second lowering hydraulic cylinder 35 at the same speed, simultaneously lowering the inner ends of the first steel span structure 60 and the second steel span structure 70. Ultimately, the inner ends of the first steel span structure 60 and the second steel span structure 70 simultaneously land on the corresponding first mounting platform 11 and second mounting platform 12. Then, the first steel span structure 60 and the second steel span structure 70 are installed and fixed.

[0064] In summary, the steel structure high-low span matching hoisting method provided in this embodiment first sets up a first temporary support mechanism 20 and a second temporary support mechanism 30 on both sides of the connecting support column 10, and then hoists the first steel span structure 60 and the second steel span structure 70 respectively, so that the first steel span structure 60 is erected on the top of the first span support column 40 and the first temporary support mechanism 20, and the second steel span structure 70 is erected on the top of the second span support column 50 and the second temporary support mechanism 30. Then, the distance from the inner end of the first steel span structure 60 to the first mounting platform 11 of the connecting support column 10 and the distance from the inner end of the second steel span structure 70 to the second mounting platform 12 of the connecting support column 10 are the same. Finally, the inner ends of the first steel span structure 60 and the second steel span structure 70 are lowered synchronously and at the same speed, so that the inner ends of the first steel span structure 60 and the second steel span structure 70 land on the corresponding first mounting platform 11 and second mounting platform 12 at the same time, so that the gravity of the high and low spans acts synchronously on the connecting support column 10.

[0065] During the hoisting process, there is no need to distinguish between high spans and low spans, and there is no need to strictly follow the hoisting sequence of high spans before low spans or low spans before high spans. This allows for the hoisting of the corresponding steel span structures according to the convenience of construction, resulting in strong construction flexibility and good environmental adaptability.

[0066] In summary, the steel structure high-low span matching hoisting method provided in this embodiment can ensure balanced force at the junction of high and low spans, maintain good verticality of the junction support column, and thus ensure the overall balance and stability of the structure.

[0067] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for matching high and low spans in the hoisting of steel structures, characterized in that, Includes the following steps: S10. A first temporary support mechanism (20) and a second temporary support mechanism (30) are respectively set on both sides of the junction support column (10). The first temporary support mechanism (20) is located on the side of the junction support column (10) facing the first span support column (40), and the second temporary support mechanism (30) is located on the side of the junction support column (10) facing the second span support column (50). S20. The first steel span structure (60) and the second steel span structure (70) are hoisted respectively, so that one end of the first steel span structure (60) is supported at the top of the first span support column (40) and the other end is supported at the top of the first temporary support mechanism (20), and one end of the second steel span structure (70) is supported at the top of the second span support column (50) and the other end is supported at the top of the second temporary support mechanism (30). S30. Adjust the distance L1 from the inner end of the first steel span structure (60) to the first mounting platform (11) of the connecting support column (10) and the distance L2 from the inner end of the second steel span structure (70) to the second mounting platform (12) of the connecting support column (10) so that L1 equals L2. S40. Simultaneously and at the same speed, lower the inner ends of the first steel span structure (60) and the second steel span structure (70) so that the inner ends of the first steel span structure (60) and the second steel span structure (70) simultaneously land on the corresponding first mounting platform (11) and the second mounting platform (12) and complete the fixing.

2. The steel structure high-low span matching hoisting method according to claim 1, characterized in that, The heights of both the first temporary support mechanism (20) and the second temporary support mechanism (30) are adjustable; In step S30, the distance from the inner end of the first steel span structure (60) to the first mounting platform (11) and the distance from the inner end of the second steel span structure (70) to the second mounting platform (12) are adjusted by adjusting the height of the first temporary support mechanism (20) and the second temporary support mechanism (30), respectively.

3. The steel structure high-low span matching hoisting method according to claim 2, characterized in that, The first temporary support structure (20) includes: The first support base (21) is supported on the side of the junction support column (10) directly opposite the first span support column (40); The first hydraulic jack (22) is installed on the first support base (21); The first temporary support (23) is installed at the end of the first hydraulic jack (22) away from the first support base (21).

4. The steel structure high-low span matching hoisting method according to claim 3, characterized in that, The first support base (21) is vertically provided with multiple first guide rods (24), which are evenly distributed around the outer circumference of the hydraulic jack, and the upper end of each first guide rod (24) is slidably inserted into the lower end of the first temporary support (23).

5. The steel structure high-low span matching hoisting method according to claim 3, characterized in that, The second temporary support structure (30) includes: The second support base (31) is supported on the side of the junction support column (10) directly opposite the second span support column (50); The second hydraulic jack (32) is installed on the second support base (31); The second temporary support (33) is installed at the end of the second hydraulic jack (32) away from the second support base (31).

6. The steel structure high-low span matching hoisting method according to claim 5, characterized in that, The first temporary support (23) is provided with a first lowering hydraulic cylinder (25) at the top. In step S20, one end of the first steel span structure (60) is supported on the moving end of the first lowering hydraulic cylinder (25). The second temporary support (33) is provided with a second lowering hydraulic cylinder (35) at the top. In step S20, one end of the second steel span structure (70) is supported on the moving end of the second lowering hydraulic cylinder (35). The first lowering hydraulic cylinder (25) and the second lowering hydraulic cylinder (35) are of the same specifications, and the drain ports of the first lowering hydraulic cylinder (25) and the second lowering hydraulic cylinder (35) are connected to the same speed inlet valve (80) through the same specification pipe. In step S40, the first lowering hydraulic cylinder (25) and the second lowering hydraulic cylinder (35) are drained at the same speed through the same speed inlet valve (80) so as to lower the inner ends of the first steel span structure (60) and the second steel span structure (70) at the same speed.

7. The steel structure high-low span matching hoisting method according to claim 6, characterized in that, The same-speed inlet valve (80) includes: The valve body (81) is provided with a first valve chamber (82) and a second valve chamber (83) of the same specification. The inlet of the first valve chamber (82) is connected to the outlet of the first lowering hydraulic cylinder (25), and the inlet of the second valve chamber (83) is connected to the outlet of the second lowering hydraulic cylinder (35). The first piston (84) is adapted to the first valve chamber (82); The second piston (85) is adapted to the second valve chamber (83); A linear actuator (86) is connected to the first piston (84) and the second piston (85) respectively to drive the first piston (84) and the second piston (85) to move synchronously.

8. The steel structure high-low span matching hoisting method according to claim 7, characterized in that, The same-speed inlet valve (80) also includes a synchronizing seat (87), which is connected to the linear actuator (86) for transmission, and the first piston (84) and the second piston (85) are rigidly connected to the synchronizing seat (87) through corresponding first rigid support rod (88) and second rigid support rod (89), respectively.

9. The steel structure high-low span matching hoisting method according to claim 8, characterized in that, The valve body (81) is mounted on the first temporary support (23), and the synchronization seat (87) is slidably mounted on the first temporary support (23).

10. The steel structure high-low span matching hoisting method according to claim 9, characterized in that, The linear driver (86) is a lead screw mechanism driven by a motor, and the lead screw of the linear driver (86) is screwed to the synchronous seat (87).

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