Cable bent tower type steel skeleton structure and cable bent tower component construction method

Abstract

The invention belongs to the technical field of bridge construction, and particularly relates to a cable bent tower profile steel skeleton structure and a cable bent tower component construction method.The cable bent tower profile steel skeleton structure comprises two profile steel skeletons which are symmetrically arranged in an attached mode, and each profile steel skeleton comprises a plurality of A-type main skeletons, a plurality of B-type main skeletons and a plurality of layers of steel net frames; the A-type main frameworks and the B-type main frameworks are parallel to each other and are vertically arranged, the A-type main frameworks and the B-type main frameworks are sleeved with the steel net frames, and each A-type main framework comprises I-shaped steel and two reinforcing ribs extending from the center of the I-shaped steel to the two sides. Each B-type main framework comprises I-shaped steel and a reinforcing rib extending from the center of the I-shaped steel to the two sides, the A-type main frameworks are arranged on the outer side faces of the profile steel frameworks, and the B-type main frameworks are arranged on the attached inner side faces of the two profile steel frameworks; the bending moment resistance strength of the ultrahigh cable bent tower can be improved.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge construction, and in particular relates to a cable tower steel skeleton structure and a cable tower component construction method. Background Art

[0002] The cable tower steel frame is the main load-bearing part of the cable tower in cable-stayed bridges and other bridge structures. It is made of high-strength, corrosion-resistant steel. Through reasonable structural design, it bears the main load of the bridge and transfers these loads to the foundation or other supporting structures. The existence of the cable tower steel frame ensures the stability and safety of the bridge.

[0003] Rigid skeletons are often used in cable tower construction, which play an important role in the positioning and installation of steel bars. During the installation of the steel bars of the cable tower, the position of the tower column steel bars can be adjusted through the rigid skeleton to ensure that the shape of the cable tower meets the requirements of the specifications. Considering that the rigid skeleton is part of the main tower structure, how to improve the rigid skeleton structure, enhance its force performance, and ensure the overall stability of the cable tower is still an urgent problem to be solved. When installing the rigid skeleton, the overall inclination and plane position of the skeleton must be guaranteed to avoid causing trouble to the steel bar binding construction. Therefore, the precise positioning and installation of the rigid skeleton is also a major difficulty.

[0004] However, when the height of the cable tower column is high, in order to improve the performance of the cable tower column in bearing bending moment and avoid deformation of the cable tower column during use, the rigid skeleton of the general cable tower column mainly uses I-beams or H-beams as the main skeleton. Therefore, the number of I-beams or H-beams is generally increased on the super-high cable tower column. However, the increase in the number of I-beams or H-beams will also lead to an increase in the weight of the cable tower column. When the number of I-beams or H-beams reaches a certain number, the bending moment strength of the cable tower column can no longer be increased with the increase in the number of I-beams or H-beams. Therefore, in order to improve the bending moment strength of the super-high cable tower column, a cable tower steel skeleton structure and a cable tower component construction method are proposed. Summary of the invention

[0005] In order to solve the above problems existing in the prior art, the present invention provides a cable tower steel skeleton structure and a cable tower component construction method.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A cable tower steel frame structure, comprising two symmetrically arranged steel frames, the steel frames comprising a plurality of A-type main frames, a plurality of B-type main frames and a plurality of layers of steel grids, the plurality of A-type main frames and the plurality of B-type main frames are arranged parallel to each other and vertically, and the plurality of layers of steel grids are sleeved on the plurality of A-type main frames and the plurality of B-type main frames;

[0008] The A-type main frame includes an I-beam and two reinforcing ribs extending from the center of the I-beam to both sides. The B-type main frame includes an I-beam and a reinforcing rib extending from the center of the I-beam to both sides. Several of the A-type main frames are located on the outer side of the steel frame, and several of the B-type main frames are located on the inner side where the two steel frames are attached.

[0009] Furthermore, the steel grid is formed by an inner and outer double-layer structure surrounded by an inner cross bar and an outer cross bar, a plurality of horizontal diagonal braces are connected between the inner cross bar and the outer cross bar, and vertical bars and vertical diagonal braces are connected between two adjacent layers of the steel grid; a plurality of the horizontal diagonal braces are cross-arranged in pairs to form a mesh connection structure, a plurality of the vertical diagonal braces are cross-arranged in pairs, and the vertical bars and the vertical diagonal braces form a mesh connection structure.

[0010] Furthermore, a plurality of type A limiting frames and a plurality of type B limiting frames are respectively arranged on the inner and outer sides of the steel frame, and a support plate is arranged below the type A limiting frames and the type B limiting frames, and the side surfaces of the support plates abut against the side surfaces of the type A main frame or a plurality of type B main frames at corresponding positions.

[0011] Furthermore, a plurality of mounting holes are regularly arranged on the A-type limiting frame and the B-type limiting frame, and the plurality of mounting holes on the A-type limiting frame and the B-type limiting frame are used to connect with the support plates at corresponding positions for positioning and fixing.

[0012] Furthermore, the A-type limiting frame and the B-type limiting frame each include a transverse plate and a T-shaped plate, and the T-shaped plate is connected to the top of the transverse plate.

[0013] Furthermore, the support plate is vertically connected to the side of the A-type main frame or the B-type main frame.

[0014] Furthermore, it also includes a skeleton web, which is arranged on the side of the steel frame.

[0015] A cable tower component construction method is applicable to a cable tower steel skeleton structure, comprising the following steps:

[0016] S1: Steel skeleton segment manufacturing: prefabricate steel bar units and horizontal tooling, combine steel bar units and angle steels to form steel sheets, transport the steel sheets to the vertical assembly site for overall assembly of steel skeleton segments, install steel bars on the steel skeleton segments, and form steel skeleton segments with steel bars;

[0017] S2: Transportation of steel frame segments: The assembled steel frame segments are placed on a flatbed truck, transported from the factory to the dock, loaded onto a ship, and transported to the construction site by water;

[0018] S3: Lifting of steel skeleton segments: The steel skeleton segments are hoisted by tower cranes and special hoists. During the hoisting process, the tower crane is used to carry out the initial trial hoisting of the steel skeleton segments. After all the hoisting points are adjusted to bear even force, a second trial hoisting is carried out. During the second trial hoisting, attention should be paid to ensuring that the center of gravity and the hoisting center of the steel skeleton segments are in the same vertical line to ensure that the steel skeleton segments do not suffer from torsional deformation during the hoisting process.

[0019] S4: Connection of steel frame segments: The steel bars are connected by straight threaded sleeves and extrusion sleeves. After the vertical connection of the steel bars is completed, the welding construction of the steel frame is carried out. After the steel frame is connected, the misalignment of adjacent interfaces is ensured to be within the tolerance range. The welding construction of the steel frame can only be carried out after the vertical connection of the steel bars is completed. The bridge-position steel frame hoisting segment connection is a horizontal weld, using a single-sided welding and double-sided forming process.

[0020] The beneficial effects of the present invention are:

[0021] (1) The steel frame is composed of multiple steel structures such as type A main frame, type B main frame and steel grid, which improves the rigidity, stability and strength of the steel frame. The cable tower adopts a steel frame concrete composite structure. Considering that the steel frame is an important part of the cable tower, the steel frame is converted into a permanent load-bearing component, that is, a permanent and temporary combined steel frame. The steel frame and concrete form a combined cross-section to bear force synergistically, which is equivalent to steel bars. By optimizing the cross-sectional size and simplifying the cross-sectional shape, the bending and shear bearing capacity are improved. At the same time, the bolting effect of the steel frame on the positive cross-sectional force and shear resistance under earthquake action is fully utilized to ensure the structural force and improve the overall stability of the cable tower.

[0022] (2) The steel bars and steel frames are pre-assembled into componentized segments on the steel frame segments. The steel frames and steel bars are installed using a componentized method, which reduces the process of partial hoisting of the steel frames and manual loose tying of steel bars, thereby improving the efficiency of cable tower construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0024] Figure 1 is a top view of a cross-sectional view of a medium-sized steel frame of the present invention;

[0025] Figure 2 The present invention Figure 1 1-1 cross-sectional schematic diagram;

[0026] Figure 3 The present invention Figure 1 2-2 cross-sectional schematic diagram;

[0027] Figure 4 The present invention Figure 1 3-3 cross-sectional schematic diagram;

[0028] Figure 5 is a top view of the medium steel frame of the present invention;

[0029] Figure 6 It is the side cross-section of the steel frame;

[0030] Figure 7 is a schematic diagram of the guide funnel.

[0031] Explanation of the reference numerals: 1. A-type main frame; 2. B-type main frame; 3. Vertical rod; 4. Inner cross bar; 5. Outer cross bar; 6. Horizontal diagonal brace; 7. Vertical diagonal brace; 8. A-type limiting frame; 9. B-type limiting frame; 10. Support plate; 11. Guide funnel. DETAILED DESCRIPTION

[0032] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0033] like Figure 1-7 As shown, a cable tower steel frame structure of the present invention comprises two symmetrically fitted steel frames, the steel frames comprise a plurality of A-type main frames 1, a plurality of B-type main frames 2 and a plurality of layers of steel grids, the plurality of A-type main frames 1 and the plurality of B-type main frames 2 are arranged parallel to each other and vertically, the plurality of layers of steel grids are sleeved on the plurality of A-type main frames 1 and the plurality of B-type main frames 2, the A-type main frame 1 comprises an I-beam and two reinforcing ribs extending from the center of the I-beam to both sides, the B-type main frame 2 comprises an I-beam and a reinforcing rib extending from the center of the I-beam to both sides, the plurality of A-type main frames 1 are arranged on the outer side of the steel frames, and the plurality of B-type main frames 2 are arranged on the inner side where the two steel frames fit together;

[0034] When the height of the cable tower column is high, the cable tower column itself is more prone to bending deformation. In order to improve the performance of the cable tower column in bearing bending moment and avoid deformation during use, the rigid skeleton of the general cable tower column mainly uses I-beams or H-beams as the main skeleton. Therefore, the number of I-beams or H-beams is generally increased on the super-high cable tower column to improve the structural strength. However, the increase in the number of I-beams or H-beams will also increase the weight of the cable tower column itself. When the number of I-beams or H-beams reaches a certain number, the bending moment strength of the cable tower column can no longer be increased with the increase in the number of I-beams or H-beams.

[0035] Therefore, in order to improve the bending moment resistance of the tower column of the ultra-high pylon, the structures of the Type A main skeleton 1 and the Type B main skeleton 2 on the main body of the tower column of the pylon are strengthened. The structural shape of the Type A main skeleton 1 is a "king" character plus a horizontal line, which is arranged on the straight side and the chamfered side of the outer side of the steel skeleton. The web of the skeleton is parallel to the wall thickness direction of the Type A main skeleton 1. The structural shape of the Type B main skeleton 2 is a "king" character, which is arranged on one side where the two steel skeletons are joined. The web of the skeleton is parallel to the wall thickness direction of the tower column. The Type A main skeleton 1 and the Type B main skeleton 2 are arranged in a circle around the tower column concrete.

[0036] When stiffeners are added to the middle of both the Type A main skeleton 1 and the Type B main skeleton 2, the structural strength of a single main skeleton can be improved. Compared with directly increasing the quantity when using I-beams, in this solution, by strengthening the structures of the Type A main skeleton 1 and the Type B main skeleton 2, while achieving the same structural strength, the weight that needs to be increased is greatly reduced, not only reducing the waste of materials but also lowering the construction difficulty.

[0037] At the same time, since the steel skeletons of each segment are connected to form a complete tower column, when each segment is connected, the steel bars, the Type A main skeleton 1, and the Type B main skeleton 2 of each segment need to be connected accordingly. In the prior art, the main skeleton is an I-beam. When used on an ultra-high tower column, the connection structure strength at the ends of two I-beams is insufficient. However, since stiffeners are provided on both the Type A main skeleton 1 and the Type B main skeleton 2, there are more connection points available and the connection strength is higher. Compared with the prior art, it is more suitable for ultra-high tower columns.

[0038] The steel skeleton is composed of various steel structures such as the Type A main skeleton 11, the Type B main skeleton 22, and the steel grid, which improves the stiffness, stability, and strength of the steel skeleton; the pylon adopts a composite structure of steel skeleton and concrete. Considering that the steel skeleton is an important part of the pylon's force-bearing, the steel skeleton is converted into a permanent force-bearing member, that is, a steel skeleton combined with temporary and permanent use. The steel skeleton and the concrete form a composite section to jointly bear the force, replacing the steel bars. By optimizing the section size and simplifying the section reinforcement, the flexural and shear bearing capacities are improved. At the same time, the bolt-pin effect of the steel skeleton on the normal section force-bearing and shear resistance under seismic action is fully utilized to ensure the structural force-bearing and improve the overall stability of the pylon.

[0039] Furthermore, since two steel frames are connected to form a segmented tower column, the structural strength of the connection surface is higher, and its structural strength can be appropriately reduced within the safety threshold of the building construction design, that is, only one reinforcing rib is extended in the middle of the B-type main frame 2, so that the weight and strength reach a balance value, and the A-type main frame 1 on the outer side that is not connected to each other is extended with two reinforcing ribs in the middle of the A-type main frame 1, which can further improve its structural strength and moment strength. By improving the structure of the A-type main frame 1 and the B-type main frame 2, a balance is achieved between weight and structural strength. While reducing the waste of materials, it also reduces the difficulty of construction.

[0040] Specifically, the steel grid is enclosed by an inner cross bar 4 and an outer cross bar 5 to form a double-layer structure, a plurality of horizontal diagonal braces 6 are connected between the inner cross bar 4 and the outer cross bar 5, and a vertical bar 3 and a vertical diagonal brace 7 are connected between two adjacent layers of the steel grid; a plurality of horizontal diagonal braces 6 are cross-arranged in pairs to form a mesh connection, a plurality of vertical diagonal braces 7 are cross-arranged in pairs, and the vertical bar 3 and the vertical diagonal brace 7 are connected in a mesh connection;

[0041] The inner crossbar 4 and the outer crossbar 5 are connected by a plurality of horizontal diagonal braces 6, and the entire steel frame is formed into a whole by a mesh connection structure of a plurality of horizontal diagonal braces 6 and a plurality of vertical bars 3. The two ends of the A-type main frame 1 and the B-type main frame 2 are connected to the inner crossbar 4 and the outer crossbar 5 respectively.

[0042] Further, a plurality of A-type limiting frames 8 and a plurality of B-type limiting frames 9 are respectively arranged on the inner side of the inner cross bar 4 and the outer side of the outer cross bar 5. The A-type limiting frames 8 and the B-type limiting frames 9 are both arranged on a support plate 10, and the end surface of the support plate 10 abuts against the side surfaces of the A-type main frame 1 or the plurality of B-type main frames 2 at the corresponding positions;

[0043] A plurality of mounting holes are regularly arranged on the A-type limiting frame 8 and the B-type limiting frame 9. The mounting holes on the A-type limiting frame 8 and the B-type limiting frame 9 are used to connect the support plate 10 at the corresponding position for positioning and fixing. At the same time, the support plate 10 is installed on the mounting holes to prevent the A-type limiting frame 8 and the B-type limiting frame 9 and the support plate 10 from displacement. The positions of the A-type limiting frame 8 and the B-type limiting frame 9 on the support plate 10 are adjusted through a plurality of regularly arranged mounting holes. On the one hand, the support plate 10 is arranged on the steel frame so that the support plate 10 abuts against the side of the A-type main frame 1 or a plurality of B-type main frames 2. On the other hand, the A-type limiting frame 8 and the B-type limiting frame 9 are supported by the support plate 10. The inner cross bar 4 and the outer cross bar 5 are supported and limited by a plurality of A-type limiting frames 8 and B-type limiting frames 9.

[0044] Specifically, the A-type limiting frame 8 and the B-type limiting frame 9 each include a horizontal plate and a T-shaped plate, wherein the T-shaped plate is connected to the top of the horizontal plate, and the support plate 10 is vertically connected to the side of the A-type main frame 1 or the B-type main frame 2 .

[0045] A componentized construction method for a cable tower, S1: manufacturing of steel frame segments: prefabricating steel bar units and horizontal tooling, forming a steel sheet body including a type A main frame 1, a plurality of type B main frames 2 and a plurality of layers of steel grids and angle steels, transporting the steel sheet body to a vertical assembly site for overall assembly of steel frame segments, installing steel bars on the steel frame segments, and forming steel frame segments with steel bars and steel bars.

[0046] S2: Transportation of steel frame segments: The assembled steel frame segments are placed on a flatbed truck, transported from the factory to the dock, loaded onto a ship, and transported to the construction site by water.

[0047] S3: Lifting of steel skeleton segments: The steel skeleton segments are hoisted by tower cranes and special hoists. During hoisting, the steel skeleton segments must be hoisted for the first time using a tower crane; after all the hoisting points are adjusted to bear force evenly, a second trial hoisting must be conducted. During the second trial hoisting, attention must be paid to the fact that the center of gravity of the steel skeleton segment as a whole and the hoisting center are in the same vertical line to ensure that the steel skeleton segment does not undergo torsional deformation during the hoisting process.

[0048] S4: Connection of steel skeleton segments: The steel bars are connected by straight threaded sleeves and extrusion sleeves. After the vertical connection of the steel bars is completed, the welding construction of the steel skeleton is carried out. After the steel skeleton is connected, the misalignment of adjacent interfaces is ensured to be within the tolerance range. The welding construction of the steel skeleton can only be carried out after the vertical connection of the steel bars is completed. The bridge steel skeleton hoisting segment is connected as a horizontal weld, using a single-sided welding and double-sided forming process. In addition, rigid constraints must be used before welding, and small line energy parameter current welding is used to prevent large welding deformation.

[0049] Preferably, in step S2, after the steel structure is loaded on board, it is tied and fixed accordingly. Before the cargo is moored, the support is fully welded to the transmission deck in advance, and a rubber pad or other anti-skid protective pad is laid on the top of the support. After the cargo is moored, 4 sections of H-shaped steel are respectively set at the stress points on the left and right sides of the cargo as side guards. The height of the side guard is 200mm higher than the stress point of the steel structure, and a diagonal brace is laid on the top of each side guard. The outermost side of the steel frame is made of 600mm channel steel or I-beam to form a herringbone brace with a height of about 2.5m, which is reinforced and recyclable. Several ground bells are welded at appropriate positions on the deck of the transport ship, and four steel wire ropes are respectively pulled diagonally on the left and right sides of the appropriate position on the top of the segment to fix its top.

[0050] The downward pressure eight-shaped reinforcement method is adopted. One end of the tying wire rope is connected to the cargo tying point, and the other end is connected to the ground bell. The wire rope interface must be fixed with double clamps and tightened with basket screws. The wire rope is used at each hanging point to move forward; the rear is pulled and reinforced into two "eight" shapes; ensure that the equipment and the hull are fixed as a whole to prevent it from shifting and tilting during transportation.

[0051] Preferably, in step S3, the steel frame and the lifting fixture are connected by a basket bolt. Before lifting, the center of gravity of the steel bar component is calculated according to the cross-sectional characteristics of the top and bottom of the steel bar, and the positions of the lifting points on each side of the lifting fixture are adjusted according to the center of gravity to ensure that the wire rope, lifting lug, and rigging are lifted vertically during the lifting process. An inclinometer is arranged on the top of the steel bar lifting fixture, and the rigging is adjusted during the lifting process to ensure that the force at each point is uniform.

[0052] During the hoisting, the steel skeleton segment should be hoisted for the first time using a tower crane. The first hoisting makes most of the wire ropes straighten and begin to bear force. At this time, check whether the ropes at each hoisting point are under force, and adjust the rigging at the non-stressed position to make each point evenly stressed. After all the hoisting points are adjusted to bear force evenly, a second hoisting should be conducted. The second hoisting should be lifted by 100mm. In the second hoisting, attention should be paid to the fact that the center of gravity and the hoisting center of the steel skeleton segment are in the same vertical line to ensure that the steel skeleton segment does not produce torsional deformation during the hoisting process. At the same time, check the hoisting rigging, the cable wind rope and the tower crane status. The hoisting can only be carried out after confirmation. During the hoisting process, the cable wind rope should be tightened to prevent collision with the tire frame.

[0053] Matching and positioning of steel frame segments: After the steel frame segments are hoisted and positioned, the steel frame is roughly matched and positioned through the lower segment guide block. The upper and lower segment steel bars are quickly guided to dock through the guide funnels 11 set at the midpoints and corners of each surface, and the steel bars are initially positioned through the guide funnels 11.

[0054] After the initial positioning is completed, measure the coordinates of the top of the steel bar, use the hand hoist to adjust the steel bar posture, and use the adjustment amount reserved for the lower vertical steel bar positioning tooling to ensure that the circumferential misalignment of the adjacent interface vertical steel bars is within the tolerance range, which can meet the subsequent vertical steel bar threaded sleeve connection. Then use matching parts to connect the steel sections and connect the steel section skeleton in the lifting point area. After the connection is completed, release the hook of the lifting equipment.

[0055] Preferably, in step S4, the bridge position welding method adopts flux-cored gas shielded welding, and the process measures are: ① trackless full-position crawling welding robot; ② welding strictly in accordance with the welding sequence; ④ multi-layer and multi-pass welding, and staggered joints during welding; narrow welds and thin weld layers are required; ⑤ the slag between layers is cleaned up.

[0056] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention; equivalent changes and modifications are still within the scope of the technical solution of the present invention.

Claims

1. A cable tower type steel skeleton structure, characterized in that: It comprises two symmetrically arranged steel frames, wherein the steel frames comprise a plurality of A-type main frames, a plurality of B-type main frames and a plurality of layers of steel grid frames, wherein the plurality of A-type main frames and the plurality of B-type main frames are arranged parallel to each other and vertically, and the plurality of layers of steel grid frames are sleeved on the plurality of A-type main frames and the plurality of B-type main frames; The A-type main frame includes an I-beam and two reinforcing ribs extending from the center of the I-beam to both sides. The B-type main frame includes an I-beam and a reinforcing rib extending from the center of the I-beam to both sides. Several of the A-type main frames are located on the outer side of the steel frame, and several of the B-type main frames are located on the inner side where the two steel frames are attached.

2. A cable tower steel skeleton structure according to claim 1, characterized in that: The steel grid is formed by an inner cross bar and an outer cross bar to form an inner and outer double-layer structure. A plurality of horizontal diagonal braces are connected between the inner cross bar and the outer cross bar, and vertical bars and vertical diagonal braces are connected between two adjacent layers of the steel grid. A plurality of the horizontal diagonal braces are cross-arranged in pairs to form a mesh connection structure, and a plurality of the vertical diagonal braces are cross-arranged in pairs, and the vertical bars and the vertical diagonal braces form a mesh connection structure.

3. A cable tower steel skeleton structure according to claim 2, characterized in that: Several A-type limiting frames and several B-type limiting frames are respectively arranged on the inner and outer sides of the steel frame, and a support plate is arranged under the A-type limiting frames and the B-type limiting frames, and the side surfaces of the support plates abut against the side surfaces of the A-type main frame or several B-type main frames at the corresponding positions.

4. A cable tower steel skeleton structure according to claim 3, characterized in that: A plurality of mounting holes are regularly arranged on the A-type limiting frame and the B-type limiting frame. The plurality of mounting holes on the A-type limiting frame and the B-type limiting frame are used to connect with the supporting plates at corresponding positions for positioning and fixing.

5. A cable tower steel skeleton structure according to claim 4, characterized in that: The A-type limiting frame and the B-type limiting frame both include a transverse plate and a T-shaped plate, and the T-shaped plate is connected to the top of the transverse plate.

6. A cable tower steel skeleton structure according to claim 5, characterized in that: The support plate is vertically connected to the side of the A-type main frame or the B-type main frame.

7. The cable tower steel skeleton structure according to claim 3, characterized in that: It also includes a skeleton web, which is arranged on the side of the steel skeleton.

8. A cable tower component construction method, applicable to a cable tower steel skeleton structure as claimed in claim 4, characterized in that: The following steps are involved: S1: Steel skeleton segment manufacturing: prefabricate steel bar units and horizontal tooling, combine steel bar units and angle steels to form steel sheets, transport the steel sheets to the vertical assembly site for overall assembly of steel skeleton segments, install steel bars on the steel skeleton segments, and form steel skeleton segments with steel bars; S2: Transportation of steel frame segments: The assembled steel frame segments are placed on a flatbed truck, transported from the factory to the dock, loaded onto a ship, and transported to the construction site by water; S3: Lifting of steel skeleton segments: The steel skeleton segments are hoisted by tower cranes and special hoists. During the hoisting process, the tower crane is used to carry out the initial trial hoisting of the steel skeleton segments. After all the hoisting points are adjusted to bear even force, a second trial hoisting is carried out. During the second trial hoisting, attention should be paid to ensuring that the center of gravity and the hoisting center of the steel skeleton segments are in the same vertical line to ensure that the steel skeleton segments do not suffer from torsional deformation during the hoisting process. S4: Connection of steel frame segments: The steel bars are connected by straight threaded sleeves and extrusion sleeves. After the vertical connection of the steel bars is completed, the welding construction of the steel frame is carried out. After the steel frame is connected, the misalignment of adjacent interfaces is ensured to be within the tolerance range. The welding construction of the steel frame can only be carried out after the vertical connection of the steel bars is completed. The bridge-position steel frame hoisting segment connection is a horizontal weld, using a single-sided welding and double-sided forming process.

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