A girder transporting crane and a method for hoisting a steel box girder

Abstract

The present invention provides a beam transporting and hoisting machine for hoisting beam segments on a steel box girder. The present invention also provides a method for hoisting a steel box girder, including: S001: respectively laying guide rails on both sides of the beam segment, and respectively arranging multiple groups of lifting lugs on both sides and the middle of the beam segment, and making the ends of the guide rails extend out of the ends of the beam segment; S002: after hoisting the beam segment, connecting it to the cable tower of the cable-stayed bridge to form a steel box girder, assembling a deck crane on the steel box girder; assembling a beam transporting and hoisting machine on the guide rails; S003: using the beam transporting and hoisting machine to hoist the beam segment and transporting it to the lower part of the end of the steel box girder; S004: connecting the beam segment through the deck crane and then disconnecting the connection between the beam transporting and hoisting machine and the beam segment; S005: connecting the beam segment and the steel box girder well through the deck crane; S006: connecting the stay cables of the cable tower of the cable-stayed bridge to the beam segment and then disconnecting the connection between the deck crane and the beam segment, and moving the deck crane to this beam segment; S007: repeating the content in the above steps until the hoisting construction is completed.

Description

Technical Field

[0001] The present invention belongs to the technical field of bridge construction, and particularly relates to a beam transporting and hoisting machine and a method for hoisting a steel box girder. Background Art

[0002] The steel box girder of a cable-stayed bridge is large in volume and heavy in weight. Generally, it is transported by water to the position to be hoisted, and a deck crane on the already installed steel box girder is used for vertical hoisting. In the case of mountainous areas and other situations where vertical hoisting is not possible, the steel box girder needs to be transported from the beam storage position to the position to be hoisted by other methods. The existing technology mainly uses a cable crane for vertical hoisting and transportation. For a steel box girder with such a large beam width and heavy weight, it poses a high challenge to the economy and reliability of the cable crane. In addition, the cable crane is only applicable to double-tower cable-stayed bridges, and a saddle support needs to be installed in the upper area of the main tower of the cable-stayed bridge, which is relatively difficult for the construction of a main tower without a cross beam. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a beam transporting and hoisting machine and a method for hoisting a steel box girder, which are used to overcome or at least partially solve or alleviate the above problems.

[0004] The present invention provides a beam transporting and hoisting machine for hoisting a box girder section on a steel box girder, including two first C-shaped frames and two second C-shaped frames. The two first C-shaped frames and the two second C-shaped frames are respectively arranged on both sides of the steel box girder. Each of the first C-shaped frames and each of the second C-shaped frames includes an upper cross beam, a connecting frame, and a lower cross beam. The connecting frame is vertically connected between the outer ends of the upper cross beam and the lower cross beam. A pair of traveling trolleys are arranged on the lower sides of the two upper cross beams. A first under-beam hoisting system is arranged on the lower cross beam of the first C-shaped frame, and a second under-beam hoisting system is arranged on the lower cross beam of the second C-shaped frame.

[0005] Optionally, it further includes a horizontal lifting tool. The horizontal lifting tool is a cross beam body. The two ends of the upper side of the horizontal lifting tool are respectively provided with a first lifting ear and a second lifting ear. The first under-beam hoisting system is connected to the first lifting ear, and the second under-beam hoisting system is connected to the second lifting ear. A third lifting ear is also arranged in the middle of the upper side of the horizontal lifting tool. A first connecting portion and a second connecting portion are further arranged on the lower side of the horizontal lifting tool. The first connecting portion is arranged between the first lifting ear and the third lifting ear, and the second connecting portion is located below the second lifting ear.

[0006] The present invention provides a method for hoisting a steel box girder, including the following steps:

[0007] S001: On both sides of the upper surface of each box girder segment, a pair of guide rails are respectively laid, and multiple groups of lifting lugs are respectively arranged on both sides and the middle of the upper surface of each box girder segment, and the ends of the guide rails extend beyond the ends of the box girder segment;

[0008] S002: After lifting the starting box girder segment, horizontally connect it to the cable-stayed bridge pylon to form a steel box girder, and assemble a deck crane on the upper surface of the steel box girder; Assemble a beam-transporting crane on each pair of the guide rails;

[0009] S003: After connecting and lifting the box girder segment with the beam-transporting crane, transport the box girder segment to the lower part of the end of the steel box girder, and make a part of the box girder segment expose from below the splicing end of the steel box girder;

[0010] S004: Connect the box girder segment through the deck crane, then disconnect the connection between the beam-transporting crane and the box girder segment, and remove the beam-transporting crane;

[0011] S005: Adjust the height of the box girder segment through the deck crane to align the connection end of the box girder segment with the steel box girder, and connect the box girder segment and the steel box girder together;

[0012] S006: Connect the stay cables on the cable-stayed bridge pylon to the box girder segment, then disconnect the connection between the deck crane and the box girder segment, and move the deck crane to this box girder segment;

[0013] S007: Repeat the content in S002 to S006 until the hoisting construction is completed.

[0014] Optionally, in step S001, a pair of fourth lifting lugs and a pair of fifth lifting lugs are respectively arranged on both sides of the middle front section and both sides of the middle rear section of the upper surface of each box girder segment, and a pair of sixth lifting lugs and a pair of seventh lifting lugs are respectively arranged in the middle of the middle front section and the middle of the rear section of the upper surface of each box girder segment.

[0015] Optionally, in step S002, a first deck lifting system and a second deck lifting system are arranged on the deck crane, and the first deck lifting system and the second deck lifting system can correspondingly connect the seventh lifting lugs and the sixth lifting lugs on the box girder segment.

[0016] Optionally, in step S003, the two beam-transporting cranes respectively connect the two fourth lifting lugs and the two fifth lifting lugs on the box girder segment through the first connection part and the second connection part on the two horizontal lifting tools. After transporting the box girder segment to the lower part of the end of the steel box girder, make the two seventh lifting lugs expose from below the splicing end of the steel box girder.

[0017] Optionally, in step S004, connect the two seventh lifting lugs through the first bridge deck lifting system on the bridge deck crane, then disconnect the connection between the second under-beam lifting system and the second lifting lug, and connect the second under-beam lifting system to the third lifting lug; then connect the second bridge deck lifting system to the two sixth lifting lugs, and disconnect the connections between the first connecting part and the second connecting part on the horizontal sling and the fourth lifting lug and the fifth lifting lug on the box girder segment.

[0018] Optionally, in step S006, disconnect the connection between the first bridge deck lifting system and the seventh lifting lug, and disconnect the connection between the second bridge deck lifting system and the sixth lifting lug.

[0019] The beam transporting crane of the present invention can move on the guide rails on both sides of the steel box girder through the traveling trolley on the upper cross beam of the first C-shaped frame and the second C-shaped frame. The first under-beam lifting system on the lower cross beam of the first C-shaped frame and the second under-beam lifting system on the lower cross beam of the second C-shaped frame can lift and transport the box girder segment, and can transport the box girder segment to the connection end of the steel box girder, solving the problem of transporting the box girder segment in mountainous areas and in the case where vertical lifting is not possible.

[0020] The steel box girder hoisting method of the present invention is to first lift the box girder segment to be connected through the beam transporting crane under the connected steel box girder, then transport the box girder segment along the steel box girder to the connection point through the beam transporting crane, and then receive the lifted box girder segment through the bridge deck crane. After the transfer of the box girder segment between the bridge deck crane and the beam transporting crane is completed, the beam transporting crane returns along the original route, and the box girder segment is hoisted to the connection point of the steel box girder and connected well through the bridge deck crane. The steel box girder hoisting method of the present invention solves the problem of hoisting the box girder segment in mountainous areas and in the case where vertical lifting is not possible, does not require the use of a cable to hoist the box girder segment, and is suitable for the construction of a main tower without a cross beam. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is the front structural schematic diagram of the beam transporting crane of the present invention;

[0022] Figure 2 is Figure 1 the side structural schematic diagram of the beam transporting crane in

[0023] Figure 3 is Figure 2 the structural schematic diagram of the horizontal sling in

[0024] Figure 4 is the structural schematic diagram of the beam transporting crane hoisting the box girder segment in the steel box girder hoisting method of the present invention;

[0025] Figure 5 is the structural schematic diagram of the beam transporting crane and the bridge deck crane transferring the box girder segment in the steel box girder hoisting method of the present invention;

[0026] Figure 6 It is a schematic structural view of the bridge deck crane hoisting the box girder section in the steel box girder hoisting method of the present invention;

[0027] Figure 7 It is a schematic structural view of connecting the box girder section at the connection end of the steel box girder in the steel box girder hoisting method of the present invention;

[0028] Figure 8 It is a schematic structural view when moving the bridge deck crane to the connected box girder section in the steel box girder hoisting method of the present invention.

[0029] In the above figures: 1 box girder section; 101 fourth lifting lug; 102 fifth lifting lug; 103 sixth lifting lug; 104 seventh lifting lug; 2 guide rail; 3 steel box girder; 4 bridge deck crane; 401 first bridge deck lifting system; 402 second bridge deck lifting system; 5 beam transporting crane; 501 first under-beam lifting system; 502 second under-beam lifting system; 510 upper crossbeam; 511 traveling trolley; 520 connecting frame; 530 lower crossbeam; 540 horizontal lifting tool; 541 first lifting lug; 542 second lifting lug; 543 third lifting lug; 544 first connecting part; 545 second connecting part; 6 stay cable.

[0030] The present invention will be further described in detail below with reference to the drawings and embodiments. Specific Embodiments

[0031] Embodiment 1

[0032] Referring to Figure 1 and Figure 2 , the present invention provides a beam transporting crane for hoisting the box girder section 1 on the steel box girder 3, including: two first C-shaped frames and two second C-shaped frames, the two first C-shaped frames and the two second C-shaped frames are respectively arranged on both sides of the steel box girder 3, each first C-shaped frame and each second C-shaped frame include an upper crossbeam 510, a connecting frame 520 and a lower crossbeam 530, the connecting frame 520 is vertically connected between the outer ends of the upper crossbeam 510 and the lower crossbeam 530, a pair of traveling trolleys 511 are arranged on the lower sides of the two upper crossbeams 510, a first under-beam lifting system 501 is arranged on the lower crossbeam 530 of the first C-shaped frame, and a second under-beam lifting system 502 is arranged on the lower crossbeam 530 of the second C-shaped frame.

[0033] The two first C-shaped frames and the two second C-shaped frames are symmetrically arranged on the guide rails 2 on both sides of the steel box girder 3. The box girder section 1 can be lifted by the first under-beam lifting system 501 and the second under-beam lifting system 502 on their lower crossbeams 530, and then transported to the connection end of the steel box girder 3 through the traveling trolleys 511 on their upper crossbeams 510 moving on the guide rails 2 on the steel box girder 3.

[0034] Example 2

[0035] Reference Figure 2 And Figure 3 On the basis of Example 1, it further includes a horizontal sling 540. The horizontal sling 540 is a crossbeam body. At both ends of the upper side of the horizontal sling 540, a first lifting lug 541 and a second lifting lug 542 are respectively arranged. The first under-beam lifting system 501 is connected to the first lifting lug 541, and the second under-beam lifting system 502 is connected to the second lifting lug 542. A third lifting lug 543 is also arranged in the middle of the upper side of the horizontal sling 540. A first connecting part 544 and a second connecting part 545 are also arranged on the lower side of the horizontal sling 540. The first connecting part 544 and the second connecting part 545 are respectively hinge seats with pin shafts and can be hinge-connected to the lifting lugs on the box girder section 1. The first connecting part 544 is located between the first lifting lug 541 and the third lifting lug 543, and the second connecting part 545 is arranged below the second lifting lug 542.

[0036] The lower side of the horizontal sling 540 has a first connecting part 544 and a second connecting part 545 with a fixed distance, which is convenient for connecting the box girder section 1. At both ends of the upper side of the horizontal sling 540, a first lifting lug 541 and a second lifting lug 542 are respectively arranged for connecting with the first under-beam lifting system 501 and the second under-beam lifting system 502 on the beam transporting crane 5. At the same time, a third lifting lug 543 is also arranged in the middle of the upper side of the horizontal sling 540. When the beam transporting crane 5 and the bridge deck crane 4 transfer the box girder section 1, after making room for the bridge deck crane 4, it is connected to the second under-beam lifting system 502.

[0037] Example 3

[0038] Reference Figures 1 to 8, on the basis of Embodiment 1 and Embodiment 2, an embodiment of the present invention provides a method for hoisting a steel box girder, comprising the following steps: S001: On both sides of the upper surface of each box girder section 1, a pair of guide rails 2 are respectively laid, and multiple groups of lifting lugs are respectively arranged on both sides and in the middle of the upper surface of each box girder section, and the ends of the guide rails 2 extend beyond the ends of the box girder section 1; S002: After the starting box girder section is hoisted and horizontally connected to the cable-stayed bridge pylon, a steel box girder 3 is formed, and a deck crane 4 is assembled on the upper surface of the steel box girder 3; A beam-transporting crane 5 is assembled on each pair of guide rails 2 respectively; S003: After the beam-transporting crane 5 is used to connect and hoist the box girder section 1, the box girder section 1 is transported to the lower part of the end of the steel box girder 3, and a part of the box girder section 1 is exposed from under the splicing end of the steel box girder 3; S004: The box girder section 1 is connected by the deck crane 4, then the connection between the beam-transporting crane 5 and the box girder section 1 is disconnected, and the beam-transporting crane 5 is removed; S005: The height of the box girder section 1 is adjusted by the deck crane 4 to align the connection end of the box girder section 1 with the steel box girder 3, and the box girder section 1 and the steel box girder 3 are connected together; S006: The stay cable 6 on the cable-stayed bridge pylon is connected to the box girder section 1, then the connection between the deck crane 4 and the box girder section 1 is disconnected, and the deck crane 4 is moved to this box girder section 1; S007: Repeat the content in S002 to S006 until the hoisting construction is completed.

[0039] When processing each box girder segment 1, a pair of guide rails 2 are directly fixed on both sides of the upper surface of the box girder segment 1 respectively. The dimensions of the guide rails 2 on each box girder segment 1 are the same. When connecting each box girder segment 1 together, each pair of guide rails 2 are also connected together; a beam transporting crane 5 is assembled on the guide rails 2 on both sides of the box girder segment 1. The beam transporting crane 5 includes a first C-shaped frame and a second C-shaped frame. The upper cross beam 510 of the first C-shaped frame and the second C-shaped frame can move along the guide rails 2 through a traveling trolley 511. A lifting system is arranged on the lower cross beam 530 at its lower part. The beam transporting cranes 5 on the guide rails 2 on both sides of the steel box girder 3 can hoist one box girder segment 1; after the two beam transporting cranes 5 hoist the box girder segment 1 and move along the guide rails 2 until the front end of the hoisted box girder segment 1 moves below the deck crane 4; a part of the deck crane 4 assembled on the steel box girder 3 extends out of the connecting end of the steel box girder 3. It has a movable deck lifting system at its upper part. After connecting the rear end of the box girder segment 1 through a set of deck lifting systems, the weight of the box girder segment 1 is borne by the deck lifting system and the beam transporting crane 5 at the same time. The deck lifting system and the beam transporting crane 5 continue to move outwards until a part of the beam transporting crane 4 moves to the part outside the end of the guide rail 2 extending out of the steel box girder 3. At this time, the middle and rear ends of the box girder segment 1 are located below the deck crane 4. Connect the middle and rear ends of the box girder segment 1 through another set of deck lifting systems. At this time, disconnect the connection between the under-beam lifting system on the beam transporting crane 5 and the box girder segment 1, so that the deck lifting system on the deck crane 4 completely bears the weight of the box girder segment 1. Hoist the box girder segment 1 to the connecting end of the steel box girder 3 through the deck lifting system for connection, and after connecting the stay cables 7 on the bridge tower to the box girder segment 1, the box girder segment 1 becomes a part of the steel box girder 3. After that, the connection of the next box girder segment 1 can be started.

[0040] Embodiment 4

[0041] Reference Figure 3 and Figure 4 On the basis of Embodiment 3, in step S001, a pair of fourth lifting lugs 101 and a pair of fifth lifting lugs 102 are respectively arranged on both sides of the middle front section and both sides of the middle rear section of the upper surface of each box girder segment 1, and a pair of sixth lifting lugs 103 and a pair of seventh lifting lugs 104 are respectively arranged in the middle of the middle front section and the middle of the rear section of the upper surface of each box girder segment 1.

[0042] The fourth lifting lugs 101 and the fifth lifting lugs 102 are respectively located on both sides of the middle front section and both sides of the middle rear section of the upper surface of each box girder segment 1. The sixth lifting lugs 103 and the seventh lifting lugs 104 are arranged in the middle of the middle front end and the middle of the rear section of the upper surface of each box girder segment 1; the beam transporting crane 5 connects the fourth lifting lugs 101 and the fifth lifting lugs 102 on the box girder segment 1 through the under-beam lifting system, and the deck crane 4 connects the sixth lifting lugs 103 and the seventh lifting lugs 104 on the box girder segment 1 through the deck lifting system respectively, and can safely transfer the box girder segment 1 under the state of ensuring the balance of the hoisting of the box girder segment 1.

[0043] Example 5

[0044] Reference Figure 3 and Figure 4 Based on Example 1, in step S002, a first bridge deck lifting system 401 and a second bridge deck lifting system 402 are provided on the bridge deck crane 4. The first bridge deck lifting system 401 and the second bridge deck lifting system 402 can be correspondingly connected to the seventh lifting lug 104 and the sixth lifting lug 103 on the box girder section 1.

[0045] Both the first bridge deck lifting system 401 and the second bridge deck lifting system 402 include two lifting devices and can move along the suspension beam of the bridge deck crane 4. The first under-beam lifting system 501 and the second under-beam lifting system 502 are respectively assembled on the girder transporting crane 5. The first under-beam lifting system 501 and the second under-beam lifting system 502 can move independently along with the first C-shaped frame and the second C-shaped frame. The lower end of the first under-beam lifting system 501 is connected to the first lifting lug 541 at one end of the horizontal lifting tool 540, and the lower end of the second under-beam lifting system 502 is connected to the second lifting lug 542 at the other end of the horizontal lifting tool 540. The first connecting portion 544 on the lower side of the horizontal lifting tool 540 is connected to the fourth lifting lug 101 on the box girder section 1, and the second connecting portion 545 on the lower side of the horizontal lifting tool 540 is connected to the fifth lifting lug 102 on the box girder section 1.

[0046] Example 6

[0047] Reference Figures 3 to 5 Based on Example 1, in step S003, the two girder transporting cranes 5 are respectively connected to the two fourth lifting lugs 101 and the two fifth lifting lugs 102 on the box girder section 1 through the first connecting portion 544 and the second connecting portion 545 on the two horizontal lifting tools 540. After transporting the box girder section 1 to the lower part of the end of the steel box girder 3, the two seventh lifting lugs 104 are exposed from below the splicing end of the steel box girder 3.

[0048] After the fourth lifting lug 101 and the fifth lifting lug 102 on the box girder section 1 are connected to both ends of the horizontal lifting tool 540, the box girder section 1 can be kept in a balanced state after being lifted. At the same time, the sixth lifting lug 103 and the seventh lifting lug 104 are left for the first bridge deck lifting system 401 and the second bridge deck lifting system 402 on the bridge deck crane 4, and the seventh lifting lug 104 on the box girder section 1 is exposed from below the splicing end of the steel box girder 3.

[0049] Example 7

[0050] Reference Figure 3 、 Figure 5 and Figure 6, on the basis of Embodiment 1, in step S004, connect two seventh lifting lugs 104 through the first deck lifting system 401 on the deck crane 4, then disconnect the connection between the second under-girder lifting system 502 and the second lifting lug 542, and connect the second under-girder lifting system 502 to the third lifting lug 543; then connect the second deck lifting system 402 to two sixth lifting lugs 103, and disconnect the connections between the first connecting part 544 and the second connecting part 545 on the horizontal spreader 540 and the fourth lifting lug 101 and the fifth lifting lug 102 on the box girder segment 1.

[0051] After the second under-girder lifting system 502 is reconnected to the third lifting lug 543 on the horizontal spreader 540, the horizontal spreader 540 continues to maintain a horizontal state, and is connected to the fourth lifting lug 101 through the first connecting part 544. Then, the first deck lifting system 401 and the girder transport crane 5 continue to move, so that the sixth lifting lug 103 on the box girder segment 1 is exposed from below the splicing end of the steel box girder 3. Then, connect the sixth lifting lug 103 on the box girder segment 1 through the second deck lifting system 402, and disconnect the connection between the horizontal spreader 540 and the fourth lifting lug 101 on the box girder segment 1.

[0052] Embodiment 8

[0053] Reference Figure 3 、 Figure 7 and Figure 8 , on the basis of Embodiment 4, in step S006, disconnect the connection between the first deck lifting system 401 and the seventh lifting lug 104, and disconnect the connection between the second deck lifting system 402 and the sixth lifting lug 103.

[0054] After connecting the box girder segment 1 to the connecting end of the steel box girder 3, then connect the box girder segment 1 to the stay cable 6. At this time, the box girder segment 1 becomes a part of the steel box girder 3 and can bear the weight of the girder transport crane 5 and the next box girder segment 1, and the next box girder segment 1 can be connected to its end.

[0055] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims. The components and structures not described in detail in this embodiment are well-known components and common structures or common means in this industry, and will not be described one by one here.

Claims

1. A beam transporting and lifting crane, which is used for hoisting beam segments (1) on a steel box girder (3), is characterized in that, Comprising: Two first C-shaped frames and two second C-shaped frames, the two first C-shaped frames and the two second C-shaped frames are respectively arranged on both sides of the steel box girder (3), each first C-shaped frame and each second C-shaped frame include an upper cross beam (510), a connecting frame (520) and a lower cross beam (530), the connecting frame (520) is vertically connected between the outer ends of the upper cross beam (510) and the lower cross beam (530), a pair of traveling trolleys (511) are arranged on the lower side of the two upper cross beams (510), a first under-beam lifting system (501) is arranged on the lower cross beam (530) of the first C-shaped frame, and a second under-beam lifting system (502) is arranged on the lower cross beam (530) of the second C-shaped frame; The beam transporting and hoisting machine further includes a horizontal sling (540), the horizontal sling (540) is a cross beam body, the two ends of the upper side of the horizontal sling (540) are respectively provided with a first lifting lug (541) and a second lifting lug (542), the first under-beam lifting system (501) is connected to the first lifting lug (541), the second under-beam lifting system (502) is connected to the second lifting lug (542), a third lifting lug (543) is further arranged in the middle of the upper side of the horizontal sling (540), a first connecting portion (544) and a second connecting portion (545) are further arranged on the lower side of the horizontal sling (540), the first connecting portion (544) is arranged between the first lifting lug (541) and the third lifting lug (543), and the second connecting portion (545) is located below the second lifting lug (542); The lower side of the horizontal sling (540) has a first connecting portion (544) and a second connecting portion (545) with a fixed distance, which is convenient for connecting the box girder segment (1). The two ends of the upper side of the horizontal sling (540) are respectively provided with a first lifting lug (541) and a second lifting lug (542), which are used for connecting with the first under-beam lifting system (501) and the second under-beam lifting system (502) on the beam transporting and hoisting machine (5). At the same time, a third lifting lug (543) is further arranged in the middle of the upper side of the horizontal sling (540). When the beam transporting and hoisting machine (5) and the deck crane (4) transfer the box girder segment (1) by hoisting, after making room for the deck crane (4), it is connected to the second under-beam lifting system (502).

2. A method for hoisting a steel box girder, characterized in that, Adopting a beam transporting and hoisting machine as described in claim 1, comprising the following steps: S001: On both sides of the upper surface of each box girder segment (1), a pair of guide rails (2) are respectively laid, and multiple groups of lifting lugs are respectively arranged on both sides and in the middle of the upper surface of each box girder segment, and the end of the guide rail (2) extends beyond the end of the box girder segment (1); S002: After lifting the starting box girder segment and horizontally connecting it to the cable-stayed bridge pylon to form a steel box girder (3), assemble a deck crane (4) on the upper surface of the steel box girder (3); Assemble a beam transporting and hoisting machine (5) on each pair of the guide rails (2); S003: After connecting the box girder segment (1) with the beam transporting and hoisting machine (5) and hoisting it, transport the box girder segment (1) to the lower part of the end of the steel box girder (3), and make a part of the box girder segment (1) expose from under the splicing end of the steel box girder (3). S004: Connect the box girder segment (1) through the deck crane (4), then disconnect the connection between the beam transporting and hoisting machine (5) and the box girder segment (1), and remove the beam transporting and hoisting machine (5). S005: Adjust the height of the box girder segment (1) through the deck crane (4) to align the connecting end of the box girder segment (1) with the steel box girder (3), and connect the box girder segment (1) and the steel box girder (3) together. S006: Connect the stay cables (6) on the cable-stayed bridge pylon with the box girder segment (1), then disconnect the connection between the deck crane (4) and the box girder segment (1), and move the deck crane (4) to this box girder segment (1). S007: Repeat the content in S003 to S006 until the hoisting construction is completed.

3. The steel box girder hoisting method according to claim 2, characterized in that In step S001, on both sides of the middle front section and both sides of the middle rear section of the upper surface of each box girder segment (1), respectively set a pair of fourth lifting lugs (101) and a pair of fifth lifting lugs (102), and in the middle of the middle front section and the middle of the rear section of the upper surface of each box girder segment (1), respectively set a pair of sixth lifting lugs (103) and a pair of seventh lifting lugs (104).

4. The steel box girder hoisting method according to claim 3, characterized in that, In step S002, set a first deck lifting system (401) and a second deck lifting system (402) on the deck crane (4), and the first deck lifting system (401) and the second deck lifting system (402) can correspondingly connect the seventh lifting lugs (104) and the sixth lifting lugs (103) on the box girder segment (1).

5. The steel box girder hoisting method according to claim 3, characterized in that In step S003, the two beam transporting and hoisting machines (5) respectively connect the two fourth lifting lugs (101) and the two fifth lifting lugs (102) on the box girder segment (1) through the first connecting part (544) and the second connecting part (545) on the two horizontal lifting tools (540). After transporting the box girder segment (1) to the lower part of the end of the steel box girder (3), make the two seventh lifting lugs (104) expose from under the splicing end of the steel box girder (3).

6. The steel box girder hoisting method according to claim 4, characterized in that In step S004, connect the two seventh lifting lugs (104) through the first deck lifting system (401) on the deck crane (4), then disconnect the connection between the second under-beam lifting system (502) and the second lifting lug (542), and connect the second under-beam lifting system (502) with the third lifting lug (543); then make the second deck lifting system (402) connect the two sixth lifting lugs (103), and disconnect the connection between the first connecting part (544) and the second connecting part (545) on the horizontal lifting tool (540) and the fourth lifting lug (101) and the fifth lifting lug (102) on the box girder segment (1).

7. The steel box girder hoisting method according to claim 4, characterized in that, In step S006, disconnect the connection between the first bridge deck lifting system (401) and the seventh lifting lug (104), and disconnect the connection between the second bridge deck lifting system (402) and the sixth lifting lug (103).

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