A construction method for moving the center of the lifting point of a steel beam

Abstract

The present invention provides a hoisting construction method with a movable center of the hoisting point for steel beams, including long steel beam components and short steel beam components; the long steel beam components include a long steel beam and a steel beam foundation, and the inner end of the long steel beam is fixedly connected to the steel beam foundation; the short steel beam components include a short steel beam and a steel beam foundation, and the inner end of the short steel beam is fixedly connected to the steel beam foundation; during construction, the present invention uses the short steel beam as a counterweight and connects it to the outer end of the long steel beam, so that when hoisting the long steel beam, the center of the hoisting point moves to the outside of the existing viaduct, thus avoiding the interference of the existing bridge structure with the installation and saving the cost required for manufacturing the counterweight; at the same time, a temporary support frame is erected outside the steel beam foundation of the long steel beam, which can be used to temporarily support the long steel beam during the installation of the long steel beam, so that the long steel beam with the counterweight is not easily offset during installation, facilitating the construction personnel to adjust the position of the inner end of the long steel beam on the steel beam foundation, thereby playing a role in accurate installation and improving the installation quality.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge construction, and particularly relates to a construction method for moving the center of the suspension point of a steel beam. Background Art

[0002] With the construction of urban infrastructure, when constructing new bridge structural components near existing bridge structures, it is often affected by the under-clearance height of the existing structure under the bridge and the existing road surface of the bridge, which brings great inconvenience to pile foundation construction, retaining pile construction and hoisting construction.

[0003] A viaduct has been built on a certain expressway section. Due to urban construction needs, it is necessary to widen the existing viaduct deck; during the construction of widening the deck, it is necessary to first construct steel beam components. The steel beam components include steel bridge piers standing upright on the ground and steel beams fixed to the upper ends of the steel bridge piers; according to the requirements of different sections, the steel beams have various lengths and installation positions. For example Figure 1 As shown, the short steel beam with a shorter length and farther from the existing viaduct can be directly hoisted by a crane and installed on the upper end of the steel bridge pier. As Figure 2 As shown, the long steel beam with a longer length and closer to the existing viaduct is difficult to be directly hoisted by a crane. The construction difficulty lies in that due to the proximity to the existing viaduct, the cable will interfere with the existing viaduct during hoisting, resulting in the inability to hoist the installation end of the long steel beam to the upper end of the steel bridge pier. At the same time, the long steel beam is heavier and the center of gravity is farther from the steel bridge pier. When hoisting and installing with a crane, there are situations such as easy deviation and improper installation. Summary of the Invention

[0004] The problem to be solved by the present invention is to provide a construction method that can avoid the interference of the existing bridge structure during the construction of new bridge structural components near the existing bridge structure and improve the installation quality.

[0005] The technical solution adopted by the present invention to solve the above problems is: a construction method for moving the center of the suspension point of a steel beam for hoisting, including long steel beam components and short steel beam components; the long steel beam components include a long steel beam and a steel beam foundation, and the inner end of the long steel beam is fixedly connected to the steel beam foundation; the short steel beam components include a short steel beam and a steel beam foundation, and the inner end of the short steel beam is fixedly connected to the steel beam foundation; the construction method includes the following steps:

[0006] Step S1: Install a steel beam foundation for supporting the long steel beam at the installation position under the existing viaduct;

[0007] Step S2: Erect a temporary support frame outside the steel beam foundation;

[0008] Step S3: Connect the outer end of the short steel beam to the outer end of the long steel beam as a counterweight for the long steel beam, so that the suspension point of the long steel beam is located outside the existing viaduct;

[0009] Step S4: Lift the long steel beam and place it on the temporary support frame. The inner end of the long steel beam is placed on the upper end of the steel beam foundation and fixedly connected.

[0010] Step S5: Remove the short steel beam used as a counterweight.

[0011] Step S6: Demolish the temporary support frame.

[0012] Step S7: Install the steel beam foundation for supporting the short steel beam at the installation position under the existing viaduct.

[0013] Step S8: Lift the short steel beam and place the inner end of the short steel beam on the upper end of the steel beam foundation and fixedly connect.

[0014] Compared with the prior art, the present invention uses a short steel beam as a counterweight, which is connected to the outer end of the long steel beam, so that when lifting the long steel beam, the center of the lifting point moves to the outside of the existing viaduct, thus avoiding the interference of the existing bridge structure on the installation and saving the cost required for manufacturing the counterweight. At the same time, a temporary support frame is erected on the outside of the steel beam foundation of the long steel beam, which can be used to temporarily support the long steel beam during the installation of the long steel beam, so that the long steel beam with a counterweight is not easily displaced during installation, facilitating the construction personnel to adjust the position of the inner end of the long steel beam on the steel beam foundation, thereby playing a role in accurate installation and improving the installation quality.

[0015] Preferably, the steel beam foundation includes a cushion layer at the bottom of the bearing platform. A pier column anchoring frame is fixedly connected to the cushion layer at the bottom of the bearing platform, and a steel pier is fixedly connected to the pier column anchoring frame. The cushion layer at the bottom of the bearing platform includes fixed leg embedded parts and fixed legs. The pier column anchoring frame includes a bearing platform part and a connecting part. The bearing platform part includes a pre-embedded frame, and the connecting part includes a temporary frame. Step S1 includes the following sub-steps:

[0016] S101: Pour the cushion layer at the bottom of the bearing platform with concrete at the installation position and install the fixed leg embedded parts.

[0017] S102: After the cushion layer at the bottom of the bearing platform solidifies, weld the fixed legs to the fixed leg embedded parts.

[0018] S103: Use a crane to lift the pier column anchoring frame and fixedly connect the bearing platform part to the fixed legs.

[0019] S104: Pour concrete into the bearing platform part to embed the pier column anchoring frame.

[0020] S105: Remove the temporary frame on the connecting part.

[0021] S106: Fix the lower end of the steel pier to the connecting part.

[0022] S107: Re-pour the connected part between the lower end of the steel pier and the connecting part with concrete.

[0023] Preferably, the temporary support frame includes several main limbs, and several channel steels are connected between the main limbs by bolts; the step S2 includes the following sub-steps:

[0024] S201: Before erecting the temporary support, detect the bearing capacity of the roadbed of the road surface;

[0025] S202: Construct the ground concrete bearing platform;

[0026] S203: Complete the assembly of the temporary support frame on the ground;

[0027] S204: Use a crane to lift the temporary support frame and fixedly connect it to the concrete bearing platform.

[0028] Preferably, the lower end surfaces of the long steel beam and the short steel beam are both provided with a falsework; a first connecting plate and a second connecting plate for fixing are provided between the long steel beam and the short steel beam; the step S3 includes the following sub-steps:

[0029] S301: Use a crane to lift the long steel beam and the short steel beam respectively;

[0030] S302: Place the long steel beam and the short steel beam on the falsework respectively, and make the outer ends of the long steel beam and the short steel beam contact;

[0031] S303: Set the first connecting plate and the second connecting plate at the contact position between the long steel beam and the short steel beam;

[0032] S304: Fix the first connecting plate and the second connecting plate with bolts.

[0033] Preferably, the step S4 includes the following sub-steps:

[0034] S401: Before lifting the long steel beam, set elevation adjustment section steels on the temporary support frame, weld a head plate and a steel plate stop block on the top of the section steel, and make marks at the corresponding positions on the outer side of the lower bottom plate of the long steel beam;

[0035] S402: Set lifting lugs on the upper end surface of the long steel beam;

[0036] S403: Use a crane to lift the long steel beam with a counterweight through the lifting lug;

[0037] S404: The crane slowly lowers the long steel beam from directly above the installation position and stops when it is 50 mm away from the upper end surface of the temporary support frame;

[0038] S405: Refer to the previously set section steel, head plate, steel plate stop block, and the marks to preliminarily position the long steel beam;

[0039] S406: After the preliminary positioning of the long steel beam is completed, continue to lower the hook to the installation position on the upper end face of the steel bridge pier;

[0040] S407: Adjust the installation position of the inner end of the long steel beam on the upper end face of the steel bridge pier;

[0041] S408: Weld and fix the inner end of the long steel beam to the upper end of the steel bridge pier.

[0042] Preferably, the step S5 includes the following sub-steps:

[0043] S501: Set lifting lugs on the upper end face of the short steel beam;

[0044] S502: Use a crane to slowly lift the short steel beam through the lifting lugs;

[0045] S503: Wait until the first connecting plate and the second connecting plate are not stressed, and then remove the first connecting plate and the second connecting plate;

[0046] S504: Lift and place the short steel beam onto the ground.

[0047] Preferably, the step S8 includes the following sub-steps:

[0048] S801: Use a crane to lift the short steel beam;

[0049] S802: Place the inner end of the short steel beam on the upper end of the steel beam foundation;

[0050] S803: Adjust the installation position of the inner end of the short steel beam on the upper end face of the steel bridge pier;

[0051] S804: Weld and fix the inner end of the short steel beam to the upper end of the steel bridge pier.

[0052] Preferably, both the long steel beam and the short steel beam include a top plate, a web, and internal diaphragms, and the lifting lugs are provided at the junctions of the top plate, the web, and the internal diaphragms. Description of the Drawings

[0053] Figure 1 It is a schematic diagram of the working condition for installing the short steel beam during the existing construction;

[0054] Figure 2 It is a schematic diagram of the working condition for installing the long steel beam and interfering with the existing elevated structure during the existing construction;

[0055] Figure 3 It is a schematic diagram of the working condition for installing the steel beam foundation of the present invention;

[0056] Figure 4 It is a schematic diagram of the working condition for installing the long steel beam with a counterweight of the present invention;

[0057] Figure 5Schematic diagram of the working condition of removing the short steel beam used as a counterweight in the present invention;

[0058] Figure 6 Schematic diagram of the working condition of installing the short steel beam in the present invention;

[0059] Figure 7 Schematic diagram of the structure of the pier column anchorage frame;

[0060] Figure 8 Schematic diagram of the structure of the temporary support frame 4;

[0061] Figure 9 Side view of the long steel beam and the short steel beam;

[0062] Figure 10 Top view of the long steel beam and the short steel beam.

[0063] In the figure, long steel beam member 1, short steel beam member 2, steel beam foundation 3, temporary support frame 4, jig 5, first connecting plate 6, second connecting plate 7, lifting lug 8, viaduct 9; long steel beam 11; short steel beam 21; pier column anchorage frame 31, steel pier 32; main limb 41, channel steel 42; embedded part 311, fixed leg 312, double-laced plate of anchor bolt anchorage frame 313, temporary frame 314. Specific implementation manner

[0064] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0065] Please refer to Figure 3 , Figure 4 , Figure 5 , Figure 6 , a hoisting construction method with a movable hoisting point center for a steel beam, including a long steel beam member 1 and a short steel beam member 2; the long steel beam member includes a long steel beam 11 and a steel beam foundation 3, and the inner end of the long steel beam 11 is fixedly connected to the steel beam foundation 3; the short steel beam member 2 includes a short steel beam 21 and a steel beam foundation 3, and the inner end of the short steel beam 21 is fixedly connected to the steel beam foundation 3;

[0066] In actual construction, the construction can be carried out according to the following steps:

[0067] Step S1: As shown in Figure 3 , install the steel beam foundation 3 for supporting the long steel beam 11 at the installation position below the existing viaduct 9;

[0068] Step S2: As shown in Figure 4 , erect the temporary support frame 4 outside the steel beam foundation 3;

[0069] Step S3: As shown in Figure 4 , connect the outer end of the short steel beam 21 to the outer end of the long steel beam 11 as a counterweight for the long steel beam 11, so that the hoisting point of the long steel beam 11 is located outside the existing viaduct 9;

[0070] Step S4: As shown in Figure 4 , lift the long steel beam 11, place the long steel beam 11 on the temporary support frame 4, and place the inner end of the long steel beam 11 on the upper end of the steel beam foundation 3 and fixedly connect them;

[0071] Step S5: As shown in Figure 5 , remove the short steel beam 21 used as a counterweight;

[0072] Step S6: Remove the temporary support frame 4;

[0073] Step S7: Install the steel beam foundation 3 for supporting the short steel beam 21 at the installation position below the existing viaduct 9;

[0074] Step S8: As shown in Figure 6 , lift the short steel beam 21, place the inner end of the short steel beam 21 on the upper end of the steel beam foundation 3 and fixedly connect them.

[0075] During actual construction, the short steel beam 21 is used as a counterweight and connected to the outer end of the long steel beam 11, so that when the long steel beam 11 is hoisted, the center of the lifting point moves to the outside of the existing viaduct, thus avoiding the interference of the existing bridge structure on the installation and saving the cost required for manufacturing the counterweight; at the same time, a temporary support frame 4 is erected outside the steel beam foundation 3 of the long steel beam 11, which can be used to temporarily support the long steel beam 11 during the installation of the long steel beam 11, so that the long steel beam 11 with a counterweight is not easily displaced during installation, facilitating the construction personnel to adjust the position of the inner end of the long steel beam 11 on the steel beam foundation 3, thereby playing a role in accurate installation and improving the installation quality.

[0076] Please refer to Figure 3 、 Figure 7 , in which, the steel beam foundation 3 includes a cushion layer 33 at the bottom of the bearing platform, a pier column anchorage frame 31 is fixedly connected to the cushion layer 33 at the bottom of the bearing platform, and a steel pier 32 is fixedly connected to the pier column anchorage frame 31; the cushion layer 33 at the bottom of the bearing platform includes a fixed leg embedded part 331 and a fixed leg 332; the pier column anchorage frame 31 includes a bearing platform part 311 and a connecting part 312; the bearing platform part includes an embedded frame 3111, and the connecting part includes a temporary frame 3121; during actual construction, the steel beam foundation 3 can be constructed in the following steps:

[0077] S101: Pour the cushion layer 33 at the bottom of the bearing platform with concrete at the installation position and install the fixed leg embedded part 331. Among them, the fixed leg embedded part 331 is at the same height as the ground of the bearing platform part 311. Specifically, the size of the fixed leg embedded part 331 can be 300mm * 300mm, the panel thickness of the fixed leg embedded part 331 is 12mm, and 4 HRB400 threaded steel bars with a diameter of Ф12 are arranged below each fixed leg embedded part 331 to reinforce the cushion layer 33 at the bottom of the bearing platform;

[0078] S102: After the cushion layer 33 at the bottom of the bearing platform has solidified, weld the fixed leg 332 to the fixed leg embedded part 331. Specifically, the fixed leg 322 can be a 16# channel steel with a length of 480 mm;

[0079] S103: Use a crane to lift the pier column anchoring frame 31, and fixedly connect the lower end of the bearing platform part 311 to the fixed leg 332;

[0080] S104: Pour concrete into the bearing platform part 311 to embed the pier column anchoring frame 31;

[0081] S105: Remove the temporary frame 3121 on the connecting part 312 to expose the steel bars on the connecting part 312;

[0082] S106: Fix the lower end of the steel pier 32 to the connecting part 312. Specifically, place the lower end face of the steel pier 32 on the upper end face of the bearing platform part 311, and insert the exposed steel bars on the connecting part 312 into the connecting holes at the lower end of the steel pier 32 and fix them;

[0083] S107: Pour concrete again on the connected part between the lower end of the steel pier 32 and the connecting part 312 to reinforce their connection.

[0084] Please continue to refer to Figure 4 、 Figure 8 , where the temporary support frame 4 includes several main members 41. The main members are connected by several channel steels 42 with bolts. Specifically, for the load-bearing support, the main members 41 are four φ426×8 round tubes, and the connecting members between the main members 42 are channel steels 42. The four main members are combined into a 2m×2m lattice load-bearing support. The horizontal height interval of the channel steels 42 is 2m. Connecting plates are welded on the main members 41. Each end of the horizontal channel steel 42 and the diagonal channel steel 42 between the main members 41 is connected by 4 bolts. The height of the main members 41 of the temporary load-bearing support is extended by butt-jointing flange plates, and the connection between the flange plates is connected by 8 bolts of M20. The temporary load-bearing support adopts two standard forms: a 2.5-meter section and a 1-meter adjustment section steel pipe. The weight of the standard section is 1 ton. When manufacturing, 1-meter adjustment section steel pipes are connected to the upper and lower parts of the 2.5-meter standard section to facilitate height control.

[0085] When actually constructing the temporary support frame 4, it can be constructed according to the following steps:

[0086] S201: Before the temporary support 4 is erected, the bearing capacity of the roadbed is detected. According to the specific installation location of the temporary support 4, the following two methods of foundation detection and treatment can be divided: The first type is located on the original road surface, and the bearing capacity of the foundation basically meets the use requirements. Before the temporary support is erected, the bearing capacity of the roadbed needs to be detected; The second type is located in the area leading to the pile cap and the original green belt. To ensure safety during construction, the area where the temporary load-bearing support is located must be filled with crushed stones in layers and compacted with a roller with a weight of not less than 20 tons. When compacting, the wheel tracks should overlap each other to prevent missed compaction. When the rolling machinery compacts the filled soil, the driving speed should be controlled. After compaction, a bearing capacity test is carried out, and then 0.2 m thick concrete is laid on it to ensure the flat contact between the temporary load-bearing support and the ground;

[0087] S202: Carry out the construction of the ground concrete pile cap. Specifically, for the concrete pile cap foundation, the cross-section can be 3.5 * 3.5 m, the concrete strength is not less than C30, the thickness of the concrete foundation is 600 mm, the plane size is set according to the distance from the center of the steel column to the edge of the concrete not less than 750 mm, and a steel bar mesh is arranged in the pile cap; The column foot of the steel column is welded to the embedded part, the thickness of the embedded part steel plate is not less than 14 mm, and 9 Ф20 threaded steel bars are arranged on each embedded part;

[0088] S203: Assemble the temporary support frame 4 on the ground;

[0089] S204: Use a crane to lift the temporary support frame 4 and fixedly connect it to the concrete pile cap.

[0090] Please continue to refer to Figure 9 、 Figure 10 , the lower end surfaces of both the long steel beam 11 and the short steel beam 21 are provided with a falsework 5; A first connecting plate 6 and a second connecting plate 7 for fixing are provided between the long steel beam 11 and the short steel beam 21. Among them, there are several first connecting plates 6, which are evenly arranged on the upper end surfaces of the long steel beam 11 and the short steel beam 21, and there are several second connecting plates 7, which are symmetrically arranged on the left and right end surfaces of the long steel beam 11 and the short steel beam 21; During actual construction, the following construction steps can be followed to splice the outer end of the short steel beam 21 to the outer end of the long steel beam 11:

[0091] S301: Use a crane to lift the long steel beam 11 and the short steel beam 21 respectively;

[0092] S302: Place the long steel beam 11 and the short steel beam 21 on the falsework 5 respectively, and make the outer end of the long steel beam 11 contact with the outer end of the short steel beam 21;

[0093] S303: Initially fix the first connecting plate 6 and the second connecting plate 7 at the contact position between the long steel beam 11 and the short steel beam 21;

[0094] S304: Fix the first connecting plate 6 and the second connecting plate 7 with bolts.

[0095] Please continue reading Figure 4 When the actual long steel beam 11 is installed, the construction can be carried out according to the following steps:

[0096] S401: Before lifting the long steel beam 11, a height-adjustable steel section is provided on the temporary support frame 4, a head plate and a steel plate stopper are welded on the top of the steel section, and a mark is made on the corresponding position on the outer side of the bottom plate of the long steel beam 11;

[0097] S402: Arrange a lifting lug 8 on the upper end surface of the long steel beam 11;

[0098] S403: Use a crane to lift the long steel beam 11 with a counterweight through the lifting lug 8;

[0099] S404: The crane slowly lowers the long steel beam 11 from directly above the installation position and stops when it is 50 mm away from the upper end surface of the temporary support frame 4;

[0100] S405: Preliminary positioning of the long steel beam with reference to the pre-set steel sections, head plates, steel plate blocks, and marks;

[0101] S406: After the long steel beam 11 is initially positioned, it is hooked to the upper end surface installation position of the steel bridge pier 32;

[0102] S407: Adjust the installation position of the inner end of the long steel beam 11 on the upper end surface of the steel bridge pier 32. Specifically, the adjustment of the installation position includes the following steps:

[0103] To adjust the front and rear positions, two reaction blocks are welded on the installed steel pier 32 and the inner web of the box of the long steel beam 11 to be adjusted, and then a 32T jack is installed between the two reaction blocks to adjust the position of the rear point of the long steel beam 11 by the jack;

[0104] To adjust the left and right positions, reaction brackets are welded on the outer support frame steels at both ends of the steel pier 32, and then a 20T jack is installed to complete the left and right position adjustment of the long steel beam 11 through the top thrust of the jack.

[0105] The vertical adjustment is carried out after the long steel beam 11 sections are adjusted in the horizontal direction. The elevation adjustment steel is set before the vertical hoisting. If there is a deviation in the vertical direction when the steel bridge pier 32 is installed, a slight adjustment is carried out. The steel bridge pier 32 is hoisted by a crane, and then the lower steel plate block is raised or cut off.

[0106] S408: The inner end of the long steel beam 11 is welded and fixed to the upper end of the steel bridge pier 32. The welding should be timely. If all welding cannot be completed in time, temporary fixing measures should be taken first, and as many personnel as possible should be arranged for on-site assembly and welding to avoid long-term shelving, deformation of the box room, difficulty in correction, and affecting the quality of the project.

[0107] Please continue to refer to Figure 5 , in actual construction, the short steel beam 21 can be demolished according to the following steps:

[0108] S501: Set up a lifting lug 8 on the upper end face of the short steel beam 21;

[0109] S502: Use a crane to slowly lift the short steel beam 21 through the lifting lug 8;

[0110] S503: Wait until the first connecting plate 6 and the second connecting plate 7 are not stressed, and then demolish the first connecting plate 6 and the second connecting plate 7;

[0111] S504: Lift and place the short steel beam 21 to the ground.

[0112] Please continue to refer to Figure 6 , in actual construction, the short steel beam 21 can be installed according to the following steps:

[0113] S801: Use a crane to lift the short steel beam 21;

[0114] S802: Place the inner end of the short steel beam 21 on the upper end of the steel beam foundation 32;

[0115] S803: Adjust the installation position of the inner end of the short steel beam 21 on the upper end of the steel pier 32;

[0116] S804: Weld and fix the inner end of the short steel beam 21 to the upper end of the steel pier 21.

[0117] Please further refer to Figure 9 、 Figure 10 , both the long steel beam 11 and the short steel beam 21 include a top plate, a web plate and internal transverse diaphragms. In order to facilitate hoisting during actual construction, the weight of the component during hoisting and the force transmission when the component is stressed should be considered. The lifting lug 9 is arranged at the intersection of the top plate, the web plate and the internal transverse diaphragm, so that the force received by the top plate is transmitted to the lower bottom plate through the web plate and the inner diaphragm, ensuring the safe hoisting of the component.

[0118] The above is only an illustration of the best embodiment of the present invention, but it should not be construed as a limitation of the claims. The present invention is not limited to the above embodiments, and its specific structure is allowed to vary. All changes made within the protection scope of the independent claims of the present invention are within the protection scope of the present invention.

Claims

1. A hoisting construction method with a movable center of the hoisting point for a steel beam, characterized in that: It includes long steel beam members and short steel beam members; the long steel beam member includes a long steel beam and a steel beam foundation, and the inner end of the long steel beam is fixedly connected to the steel beam foundation; the short steel beam member includes a short steel beam and a steel beam foundation, and the inner end of the short steel beam is fixedly connected to the steel beam foundation; the construction method comprises the following steps: Step S1: Install the steel beam foundation for supporting the long steel beam at the installation position under the existing viaduct; Step S2: Erect a temporary support frame outside the steel beam foundation; Step S3: Connect the outer end of the short steel beam to the outer end of the long steel beam as a counterweight for the long steel beam, so that the lifting point of the long steel beam is located outside the existing viaduct; Step S4: Lift the long steel beam and place the long steel beam on the temporary support frame, and place the inner end of the long steel beam on the upper end of the steel beam foundation and fixedly connect them; Step S5: Remove the short steel beam used as a counterweight; Step S6: Remove the temporary support frame; Step S7: Install the steel beam foundation for supporting the short steel beam at the installation position under the existing viaduct; Step S8: Lift the short steel beam and place the inner end of the short steel beam on the upper end of the steel beam foundation and fixedly connect them.

2. The steel beam hoisting construction method with a movable center of hoisting points according to claim 1, wherein: The steel beam foundation includes a cushion layer at the bottom of the bearing platform, a pier column anchorage frame is fixedly connected to the cushion layer at the bottom of the bearing platform, and a steel pier is fixedly connected to the pier column anchorage frame; the cushion layer at the bottom of the bearing platform includes fixed leg embedded parts and fixed legs; the pier column anchorage frame includes a bearing platform part and a connecting part; the bearing platform part includes a pre-embedded frame, and the connecting part includes a temporary frame; Step S1 includes the following sub-steps: S101: Pour the cushion layer at the bottom of the bearing platform with concrete at the installation position and install fixed leg embedded parts; S102: After the cushion layer at the bottom of the bearing platform solidifies, weld fixed legs on the fixed leg embedded parts; S103: Use a crane to lift the pier column anchorage frame and fixedly connect the bearing platform part to the fixed legs; S104: Pour concrete into the bearing platform part to embed the pier column anchorage frame; S105: Remove the temporary frame on the connecting part; S106: Fix the lower end of the steel pier to the connecting part; S107: Pour concrete again at the connected part between the lower end of the steel pier and the connecting part.

3. The steel beam hoisting construction method with a movable center of hoisting points according to claim 2, characterized in that: The temporary support frame includes several main limbs, and several channel steels are connected between the main limbs by bolts; Step S2 includes the following sub-steps: S201: Before erecting the temporary support, detect the bearing capacity of the foundation of the road surface; S202: Construct the ground concrete bearing platform; S203: Complete the assembly of the temporary support frame on the ground; S204: Use a crane to lift the temporary support frame and fixedly connect it to the concrete bearing platform.

4. The steel beam hoisting point center mobile hoisting construction method according to claim 1, characterized in that: The lower end surfaces of the long steel beam and the short steel beam are both provided with a falsework; a first connecting plate and a second connecting plate for fixation are arranged between the long steel beam and the short steel beam; Step S3 includes the following sub-steps: S301: Use a crane to lift the long steel beam and the short steel beam respectively; S302: Place the long steel beam and the short steel beam on the falsework respectively, and make the outer end of the long steel beam contact with the outer end of the short steel beam; S303: Set a first connecting plate and a second connecting plate at the contact position between the long steel beam and the short steel beam; S304: Fix the first connecting plate and the second connecting plate with bolts.

5. The hoisting construction method for the center movable hoisting point of the steel beam according to claim 3, characterized in that: The step S4 includes the following sub-steps: S401: Before hoisting the long steel beam, set elevation-adjusting steel sections on the temporary support frame, weld a head plate and a steel plate block on the top of the steel section, and make marks at corresponding positions on the outer side of the lower bottom plate of the long steel beam; S402: Set lifting lugs on the upper end face of the long steel beam; S403: Use a crane to hoist the long steel beam with counterweights through the lifting lugs; S404: The crane slowly lowers the long steel beam from directly above the installation position and stops when it is 50 mm away from the upper end face of the temporary support frame; S405: Refer to the previously set steel sections, head plates, steel plate blocks, and marks for preliminary positioning of the long steel beam; S406: After the preliminary positioning of the long steel beam is completed, continue to lower the hook to the installation position on the upper end face of the steel pier; S407: Adjust the inner end of the long steel beam at the installation position on the upper end face of the steel pier; S408: Weld and fix the inner end of the long steel beam to the upper end of the steel pier.

6. The construction method for mobile hoisting of the center of the lifting point of the steel beam according to claim 4, characterized in that: The step S5 includes the following sub-steps: S501: Set lifting lugs on the upper end face of the short steel beam; S502: Use a crane to slowly lift and hold the short steel beam through the lifting lugs; S503: Wait until the first connecting plate and the second connecting plate are not stressed, and then remove the first connecting plate and the second connecting plate; S504: Lift and place the short steel beam to the ground.

7. The steel beam lifting point center mobile hoisting construction method according to claim 6, characterized in that: The step S8 includes the following sub-steps: S801: Use a crane to hoist the short steel beam; S802: Place the inner end of the short steel beam on the upper end of the steel beam foundation; S803: Adjust the inner end of the short steel beam at the installation position on the upper end face of the steel pier; S804: Weld and fix the inner end of the short steel beam to the upper end of the steel pier.

8. The steel beam hoisting construction method with a movable center of hoisting points according to claim 6 or 5, characterized in that: Both the long steel beam and the short steel beam include a top plate, a web, and internal diaphragms, and the lifting lugs are arranged at the intersections of the top plate, the web, and the internal diaphragms.

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