Assembled box type girder integrated bridge girder erection machine and construction method thereof

Abstract

According to the fabricated box type girder integrated bridge girder erection machine and the construction method, the box type girder of the bridge girder erection machine can be installed in a segmented mode, segments can be properly lengthened according to the bridge span, and the problem that on the premise of safe construction, the length of the girder of the bridge girder erection machine cannot be matched with girders of different spans is solved; when the bridge girder erection machine hoists the box girder, the girder, the crown block, the box girder and the like transversely move left and right synchronously, the first crown block can be anchored together through the girder anchoring device, the first box girder and the second supporting leg in a pin bearing mode, the first crown block is started to walk backwards, and the effect of applying counter-acting force to the girder is achieved. Enabling the main beam to move forwards to pass through the hole; by installing the first short supporting leg, the 90t front crown block and the 90t rear crown block in a combined mode, erecting construction of a prefabricated box girder can be completed, by installing the first long supporting leg, the 270t front crown block and the 90t rear crown block in a combined mode, erecting construction of a prefabricated pier column and a prefabricated cover beam can be completed, and the functions are more comprehensive.

Description

Technical Field

[0001] The invention belongs to the technical field of assembled bridge erection construction, and in particular relates to an assembled box-type main beam integrated bridge erection machine and a construction method. Background Art

[0002] Fully prefabricated bridge structures are an effective means to speed up construction, reduce on-site pollution, and achieve low-carbon construction. Under the guidance of national policies and technological development, prefabricated bridge structures are also being used more and more widely in various projects. Traditional double-guide beam bridge erection machines are composed of double main guide beams, outriggers, beam hoisting trolleys, walking mechanisms, transverse mechanisms, and electronic control systems. The main beams mostly use triangular trusses or Bailey plates. The structure is simple but is prone to deformation after repeated transportation and erection of prefabricated box beams. Its front outrigger needs to be anchored to the bridge piers. The construction procedures are numerous and complicated, which slows down the construction progress. It can only erect prefabricated box beams, and cannot perform prefabricated piers and prefabricated cap beams. The function is single. In order to solve the above problems, the present invention designs a new type of prefabricated box-type main beam integrated bridge erection machine and construction method. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides an assembled box-type main beam integrated bridge-building machine and a construction method thereof, which solves the problems of multiple and complicated construction processes and single functions existing in the construction of traditional bridge-building machines.

[0004] The present invention achieves the above technical objectives through the following technical means.

[0005] An assembled box-type main beam integrated bridge-building machine comprises two assembled box-type main beams, which are arranged in parallel and the front and rear ends are vertically connected by a cross beam, each box-type main beam is divided into five sections, which are divided into an upper layer and a lower layer, and the box-type main beam sections are connected by pin bearings; a row of main beam chains are arranged on the top of the box-type main beam, and a main beam anchoring device is arranged on the lower surface of the box-type main beam; four legs are arranged below the box-type main beam, namely, leg No. 1, leg No. 2, leg No. 3, and leg No. 4, and leg No. 1, leg No. 2, leg No. 3, and leg No. 4 are all equipped with a hanging wheel mechanism, a pump station, a telescopic jack, and a supporting wheel mechanism; leg No. 2 and leg No. 3 are both provided with an auxiliary mechanism and a transverse movement mechanism.

[0006] Furthermore, the working area is between the No. 1 support leg and the No. 2 support leg, a row of main beam chains are arranged above the box-type main beam, and the No. 1 overhead crane and the No. 2 overhead crane are arranged above the main beam chains, the No. 1 overhead crane is in front, and the No. 2 overhead crane is in the back, and a cab is arranged at the right tail of the box-type main beam, and is equipped with a wireless remote control, which has wireless control function, voice recognition function and video display function.

[0007] Furthermore, the No. 1 leg is a telescopic leg. When erecting the prefabricated box girder, a shortened No. 1 leg is used and is set in the middle of the top support of the cap beam; when erecting the prefabricated piers and prefabricated cap beams, an extended No. 1 leg is used and anchored to the top of the pedestal with high-strength bolts.

[0008] Furthermore, the No. 2 support leg and the No. 3 support leg are load-bearing support legs, which are arranged on the beam surface of the prefabricated box girder that has been erected; the No. 4 support leg is an auxiliary support leg, which is arranged above the erected box girder.

[0009] Furthermore, the No. 1 support leg, the No. 2 support leg and the No. 3 support leg can all achieve self-rotation through manual adjustment to adapt to curved road routes with a radius of more than 500 meters.

[0010] Furthermore, the second leg and the third leg are both installed with two telescopic legs, and each telescopic leg is provided with a telescopic device, which can be extended or shortened individually or simultaneously.

[0011] Furthermore, a leg main beam is arranged above the jacks of the No. 2 leg and the No. 3 leg, a transverse movement mechanism is arranged on the leg main beam, and a hanging wheel mechanism is arranged on it. The hanging wheel mechanism is used to bear the box-type main beam of the bridge erection machine, and the transverse movement mechanism is used to make the entire bridge erection machine move horizontally left and right to the position of the prefabricated box beam to be installed. The hanging wheel mechanism and the No. 1 overhead crane are connected by an auxiliary mechanism, the box-type main beam and the No. 2 leg through pin bearings. When the No. 1 overhead crane is started to move backward, a reaction force is applied to the box-type main beam, so that the box-type main beam moves forward to pass through the hole.

[0012] Furthermore, when erecting a box girder, the No. 3 leg is suspended in the air, and the No. 1 leg, No. 2 leg and No. 4 leg provide support. When erecting a span of four box girders, the No. 3 leg is suspended in the air near the No. 2 leg, and the beam transport vehicle directly enters under the entire bridge erection machine, first erecting two middle beams, and then erecting the side beams. When erecting the side beams, bottom lifting is performed, and the overhead crane lifts the side beams to a suitable position. The No. 3 leg retreats to the position of the No. 4 leg to stand, and the No. 1 leg and the No. 4 leg are suspended in the air. At this time, the entire machine and the side beams are borne by the No. 2 leg and the No. 3 leg. The No. 2 leg and the No. 3 leg are operated to move horizontally as a whole until the side beam is erected. The overhead crane moves forward with the side beam, and finally drops the beam. The erection of the other side beam is the same.

[0013] The through-hole construction method using the above-mentioned assembled box-type main beam integrated bridge erection machine includes the following processes: S1. After installing the prefabricated box beams in the rear span operation area, comprehensively check the structure and system safety status of the bridge erection machine and loosen the main beam anchoring device; S2, the No. 1 overhead crane is above the No. 1 outrigger, the No. 2 overhead crane moves along the box-type main beam to the top of the No. 3 outrigger, the No. 4 outrigger supports, the No. 3 outrigger is suspended in the air, moves forward and is finally supported on the top surface of the box beam near the No. 2 outrigger, and the No. 3 outrigger is anchored to the main beam as a whole through the main beam anchoring device; S3, the No. 1 overhead crane and the No. 2 overhead crane move to the top of the No. 3 outrigger, the No. 2 outrigger is suspended in the air, and moves forward to the top of the box girder near the No. 1 outrigger for support, and the No. 2 outrigger is anchored to the main beam as a whole through the main beam anchoring device; S4, No. 1 outrigger and No. 4 outrigger are suspended in the air, No. 1 overhead crane is fixed with No. 3 outrigger through the hanging wheel mechanism and the longitudinal traction device, and No. 1 overhead crane is controlled to move backward through the remote wireless remote control or the driver's cab. Since No. 1 overhead crane and No. 3 outrigger are fixed as a whole, the force is applied to the box-type main beam as a reaction force, so that the main beam and No. 1 outrigger move forward until No. 1 outrigger moves to the front of the top support of the next span cap beam; S5. Support the No. 1 outrigger, open the longitudinal traction device between the No. 1 overhead crane and the No. 3 outrigger, open the anchoring device between the No. 2 and No. 3 outriggers and the box girder, fully inspect the bridge erecting machine, and prepare to erect the prefabricated box girder; S6. The bridge erection machine and overhead crane are ready to be in place. The prefabricated box beam is hoisted by using a bottom crane. First, two middle beams are erected, and then two side beams are erected. S7. After the erection is completed, the entire bridge-erecting machine returns to the middle of the second and third legs, and a comprehensive inspection of the bridge-erecting machine is carried out to prepare for the next span.

[0014] The present invention has the following beneficial effects: 1. The construction method of the present invention can complete the hoisting operation of prefabricated piers, prefabricated dry-assembled segmental cap beams and prefabricated box beams in the operation area with poor foundation bearing capacity or in the narrow area where the truck crane cannot be used for construction, thus avoiding the requirements for the crane station position, reinforcing the foundation, saving construction costs and reducing safety risks; 2. The present invention designs a new type of assembled bridge-building machine: the box-type main beam can be installed in sections, and the sections can be appropriately increased according to the bridge span, which solves the problem that the length of the main beam of the bridge-building machine cannot match the main beams of different spans under the premise of safe construction.

[0015] 3. The present invention designs a new method for erecting box girders: the box girder passes over the No. 3 support leg, and when the bridge erecting machine hoists the box girder, the main girder, overhead crane, box girder, etc. are synchronously moved left and right.

[0016] 4. The present invention designs a new type of bridge erection machine through-hole method: the No. 1 overhead crane can be pin-anchored together with the main beam anchoring device, the box-type main beam 1 and the No. 2 support leg. The No. 1 overhead crane is started to move backward, which plays a role in applying a reaction force to the main beam, so that the main beam moves forward to pass the hole.

[0017] 5. The present invention designs a bridge erection machine that can adapt to various working conditions: it can erect prefabricated piers, prefabricated cap beams, and prefabricated box beams: by installing a combination of short legs No. 1, a 90t front crane and a 90t rear crane, the erection of prefabricated box beams can be completed; by installing a combination of long legs No. 1, a 270t front crane and a 90t rear crane, the erection of prefabricated piers and prefabricated cap beams can be completed.

[0018] 6. Use assembled box-type main beams and No. 1 long legs and short legs. The assembled box-type main beams have the advantages of light structure, easy installation, high torsional rigidity, safety and reliability, and strong bearing capacity. Different long and short legs can be replaced according to the type of prefabricated components, and the short legs do not need to be anchored. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the design of the assembled box-type main beam integrated bridge erecting machine of the present invention; Figure 2 This is the front view of the assembled box-type main beam described in the present invention; Figure 3 It is a side view of the assembled box-type main beam described in the present invention; Figure 4 This is a front view of the No. 1 short outrigger position described in the present invention; Figure 5 This is the front view of the No. 1 long outrigger position described in the present invention Figure 6 This is a front view of the second and third legs in the present invention; Figure 7 This is a front view of the fourth outrigger position described in the present invention; Figure 8 This is the design drawing of the 90t crane (Crane No. 2) described in the present invention; Fig. 9 This is the design drawing of the 270t crane (Crane No. 1) described in the present invention; Fig.10 It is a process diagram of the bridge erection machine through the hole described in the present invention; Fig.11 The present invention is a process diagram for erecting prefabricated box girders using the bridge erecting machine described in the present invention.

[0020] In the figure: 1-box-type main beam; 2-main beam chain; 3-No. 2 overhead crane; 4-transverse trolley; 5-No. 1 overhead crane; 6-No. 1 outrigger; 7-No. 2 outrigger; 8-No. 3 outrigger; 9-No. 4 outrigger; 10 main beam anchoring device; 11 auxiliary mechanism, 12 transverse movement mechanism, 13 hanging wheel mechanism, 14 pump station, 15 telescopic jack, 16 supporting wheel mechanism, 17-crossbeam, 18-outrigger main beam. DETAILED DESCRIPTION

[0021] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments, but the protection scope of the present invention is not limited thereto.

[0022] like Figure 2 , 3 As shown, the assembled box-type main beam integrated bridge-building machine described in the present invention includes two assembled box-type main beams 1, which are arranged in parallel and the front and rear ends are vertically connected by a cross beam 17, and the connection method is through high-strength bolts and their accessories.

[0023] like Figure 1 As shown, four supporting legs are arranged below the box-type main beam 1, namely, supporting leg No. 1 6, supporting leg No. 2 7, supporting leg No. 3 8, and supporting leg No. 4 9.

[0024] like Figure 1 , 4 As shown in , 5, the No. 1 support leg 6 is a telescopic support leg, and the long and short legs can be replaced according to the type of prefabricated components to be erected. When erecting prefabricated box girders, the No. 1 support leg 6 (short leg) is used, and it is set in the middle of the top support of the cap beam; when erecting prefabricated piers and prefabricated cap beams, the No. 1 support leg 6 (long leg) is used, and it is anchored to the top of the pedestal with high-strength bolts.

[0025] like Figure 1 , 6 As shown in , 7, the No. 2 support leg 7 and the No. 3 support leg 8 are load-bearing support legs, which are arranged on the surface of the prefabricated box girder that has been erected, and the No. 4 support leg 9 is an auxiliary support leg, which is arranged above the erected box girder; the No. 1 support leg 6 and the No. 2 support leg 7 are between the working area, and a row of main beam chains 2 are arranged above the box-type main beam 1, and the No. 1 overhead crane 5 and the No. 2 overhead crane 3 are arranged above the main beam chains 2, the No. 1 overhead crane 5 is in the front, and the No. 2 overhead crane 3 is in the rear, and a cab is arranged at the right rear of the box-type main beam 1, and is equipped with a wireless remote controller, which has wireless control function, voice recognition function and video display function.

[0026] like Figure 2 , 3 As shown, each box-type main beam 1 is divided into five sections, which are divided into an upper layer and a lower layer. The sections of the box-type main beam 1 are connected by pin bearings, and the sections can be increased or reduced according to actual construction needs. When erecting prefabricated box beams, only the upper layer can be used, and the upper layer is required when erecting prefabricated piers and prefabricated cap beams to increase the bearing capacity of the box-type main beam 1. A row of main beam chains 2 are arranged on the top of the box-type main beam 1. The main beam chain 2 can increase or decrease in length according to the sections of the box-type main beam 1. A main beam anchoring device 10 is arranged on the lower surface of the box-type main beam 1, which is used to anchor the No. 2 support leg 7 and the box-type main beam 1 together when erecting prefabricated components to increase the structural safety.

[0027] The No. 1 outrigger 6, the No. 2 outrigger 7 and the No. 3 outrigger 8 can all be self-rotating through manual adjustment and can adapt to curved road routes with a radius of more than 500 meters.

[0028] The second leg 7 and the third leg 8 are both equipped with two telescopic legs, each of which is provided with a telescopic device, which can be extended or shortened separately or simultaneously. The second leg 7 and the third leg 8 are both provided with an auxiliary mechanism 11, a transverse mechanism 12, and a hanging wheel mechanism 13. The auxiliary mechanism 11 is an innovative device, and the transverse mechanism 12 and the hanging wheel mechanism 13 are both improved mechanisms. A leg main beam 18 is arranged above the jacks of the second leg 7 and the third leg 8, on which a transverse mechanism 12 is arranged, and a hanging wheel mechanism 13 is arranged on top. The hanging wheel mechanism 13 is used to bear the box-type main beam 1 of the bridge erection machine. The transverse mechanism 12 can make the entire bridge erection machine move horizontally left and right to the position of the prefabricated box beam to be installed. The hanging wheel mechanism 13 and the No. 1 overhead crane 5 can be connected by the auxiliary mechanism 11, the box-type main beam 1 and the No. 2 leg 7 through pin bearings. Starting the No. 1 overhead crane 5 to move backward plays a role in applying a reaction force to the box-type main beam 1, so that the box-type main beam 1 moves forward to pass through the hole.

[0029] The first leg 6, the second leg 7, the third leg 8 and the fourth leg 9 are all equipped with a hanging wheel mechanism 13, a pump station 14, a telescopic jack 15 and a supporting wheel mechanism 16. The telescopic jack 15 is controlled by the pump station 14 to be lifted or lowered, and each telescopic jack 15 can be extended or shortened individually or simultaneously.

[0030] The No. 1 support leg 6 (short support leg), the No. 2 support leg 7, the No. 3 support leg 8 and the No. 4 support leg 9 are all provided with a supporting wheel mechanism 16, wherein the No. 1 short support leg includes two groups of four supporting wheels, and the No. 2, No. 3 and No. 4 support legs each include four groups of eight supporting wheels in total, and the supporting wheels can be extended or shortened by rotation. When each support leg is in position for the erected precast box girder, the bridge deck may have a slope. By fine-tuning the supporting wheels, the support legs can be fully fitted with the erected precast box girder beam surface.

[0031] The present invention fully improves the utilization rate of the No. 1 support leg 6 and the No. 4 support leg 9. When erecting a box beam, the No. 3 support leg 8 is suspended in the air, and the No. 1 support leg 6, the No. 2 support leg 7, and the No. 4 support leg 9 provide support. When erecting a span of four box beams, the No. 3 support leg 8 is suspended in the air near the No. 2 support leg 7, and the beam transport vehicle can directly enter under the entire bridge erection machine, and first perform the task of erecting two middle beams, and then perform the erection of side beams. When erecting side beams, bottom lifting is performed, and the front crane and the rear crane lift the side beams and raise them to a suitable position. The No. 3 support leg 8 retreats to the position of the No. 4 support leg 9 to stand, and then the No. 1 support leg 6 and the No. 4 support leg 9 are suspended in the air. At this time, the whole machine and the side beams are borne by the No. 2 support leg 7 and the No. 3 support leg 8. The No. 2 support leg 7 and the No. 3 support leg 8 are operated to move horizontally as a whole until the side beam is erected. The front crane and the rear crane move forward with the side beam, and finally drop the beam, and erect another side beam in the same way.

[0032] like Figure 8 , 9As shown, the bridge erecting machine in the present invention can also erect prefabricated piers and prefabricated cap beams. During construction, it is necessary to select a double-layer box-type main beam 1, a No. 1 support leg (long support leg), a 270t No. 1 overhead crane 5 and other structures for under-span lifting and installation construction, which will not be repeated here.

[0033] Reference Fig.10 , 11 The through-hole construction method of the assembled box-type main beam integrated bridge erecting machine of the present invention is as follows: S1. After installing the prefabricated box girder in the rear span operation area, comprehensively check the structure and system safety status of the bridge erection machine, and loosen the main beam anchoring device 10; S2, the No. 1 overhead crane 5 is above the No. 1 leg 6, the No. 2 overhead crane 3 moves along the box-type main beam 1 to the top of the No. 3 leg 7, the No. 4 leg 9 supports, the No. 3 leg 8 is suspended in the air, moves forward and is finally supported on the top surface of the box beam near the No. 2 leg 7, and the No. 3 leg 8 is anchored to the main beam as a whole through the main beam anchoring device 10; S3, the No. 1 overhead crane 5 and the No. 2 overhead crane 3 move to the top of the No. 3 support leg 8, the No. 2 support leg 7 is suspended in the air, and moves forward to the top of the box girder near the No. 1 support leg 6, and supports it, and the No. 2 support leg 7 is anchored to the main beam as a whole through the main beam anchoring device 10; S4, the No. 1 support leg 6 and the No. 4 support leg 9 are suspended in the air, the No. 1 overhead crane 5 is fixed by the hanging wheel mechanism 13 and the longitudinal traction device and the No. 3 support leg 8, and the No. 1 overhead crane 5 is controlled to move backward by the remote wireless remote control or the driver's cab. Since the No. 1 overhead crane 5 and the No. 3 support leg 8 are fixed as a whole, the force is applied to the box-type main beam 1 as a reaction force, so that the main beam 1 and the No. 1 support leg 6 move forward until the No. 1 support leg 6 moves to the front of the top support of the next span cap beam; S5, support the No. 1 leg 6, open the longitudinal traction device between the No. 1 overhead crane 5 and the No. 3 leg 8, open the anchoring device between the No. 2 leg 7 and the No. 3 leg 8 and the box girder, fully check the bridge erection machine, and prepare to erect the prefabricated box girder; S6. The bridge erection machine and overhead crane are ready to be in place. The prefabricated box beam is hoisted by using a bottom crane. First, two middle beams are erected, and then two side beams are erected. S7. After the erection is completed, the entire bridge-erecting machine returns to the middle of the second leg 7 and the third leg 8, and a comprehensive inspection of the bridge-erecting machine is carried out to prepare for the next span.

[0034] The embodiments are preferred implementations of the present invention, but the present invention is not limited to the above-mentioned implementations. Any obvious improvements, substitutions or modifications that can be made by those skilled in the art without departing from the essential content of the present invention belong to the protection scope of the present invention.

Claims

1. An assembled box-type main beam integrated bridge erecting machine, characterized in that: The invention comprises two assembled box-type main beams (1), the box-type main beams (1) are arranged in parallel and the front and rear ends are vertically connected by a cross beam (17), each box-type main beam (1) is divided into five sections, which are divided into an upper layer and a lower layer, and the sections of the box-type main beam (1) are connected by pin bearings; a row of main beam chains (2) are arranged on the top of the box-type main beam (1), and a main beam anchoring device (10) is arranged on the lower surface of the box-type main beam (1); four supporting legs are arranged below the box-type main beam (1), namely a No. 1 supporting leg (6), a No. 2 supporting leg (7), a No. 3 supporting leg (8), and a No. 4 supporting leg (9); the No. 1 supporting leg (6), the No. 2 supporting leg (7), the No. 3 supporting leg (8), and the No. 4 supporting leg (9) are all equipped with a hanging wheel mechanism (13), a pump station (14), a telescopic jack (15), and a supporting wheel mechanism (16); the No. 2 supporting leg (7) and the No. 3 supporting leg (8) are both provided with an auxiliary mechanism (11) and a transverse movement mechanism (12).

2. The assembled box-type main beam integrated bridge erecting machine according to claim 1 is characterized in that: The working area is between the No. 1 support leg (6) and the No. 2 support leg (7). A row of main beam chains (2) are arranged above the box-shaped main beam (1). A No. 1 overhead crane (5) and a No. 2 overhead crane (3) are arranged above the main beam chains (2). The No. 1 overhead crane (5) is in front and the No. 2 overhead crane (3) is in the rear. A cab is arranged at the right rear of the box-shaped main beam (1) and is equipped with a wireless remote controller. The wireless remote controller has a wireless control function, a voice recognition function and a video display function.

3. The assembled box-type main beam integrated bridge erecting machine according to claim 1 is characterized in that: The No. 1 support leg (6) is a telescopic support leg. When erecting a prefabricated box girder, a shortened No. 1 support leg (6) is used and is arranged in the middle of the top support of the cap beam; when erecting a prefabricated pier column or a prefabricated cap beam, an extended No. 1 support leg (6) is used and is anchored to the top of the pedestal using high-strength bolts.

4. The assembled box-type main beam integrated bridge erecting machine according to claim 1, characterized in that: The second support leg (7) and the third support leg (8) are load-bearing support legs, which are arranged on the beam surface of the prefabricated box girder that has been erected; the fourth support leg (9) is an auxiliary support leg, which is arranged above the erected box girder.

5. The assembled box-type main beam integrated bridge erecting machine according to claim 1, characterized in that: The first support leg (6), the second support leg (7) and the third support leg (8) are all manually adjusted to achieve self-rotation so as to adapt to a curved road route with a radius of more than 500 meters.

6. The assembled box-type main beam integrated bridge erecting machine according to claim 1, characterized in that: The second supporting leg (7) and the third supporting leg (8) are both equipped with two telescopic supporting legs, each of which is provided with a telescopic device and can be extended or shortened individually or simultaneously.

7. The assembled box-type main beam integrated bridge erecting machine according to claim 2, characterized in that: A leg main beam (18) is arranged above the jacks of the No. 2 leg (7) and the No. 3 leg (8), a transverse movement mechanism (12) is arranged on the leg main beam (18), and a hanging wheel mechanism (13) is arranged on the leg main beam. The hanging wheel mechanism (13) is used to support the box-type main beam (1) of the bridge erection machine, and the transverse movement mechanism (12) is used to make the entire bridge erection machine move horizontally to the position of the prefabricated box beam to be installed. The hanging wheel mechanism (13) and the No. 1 overhead crane (5) are connected by pin bearings through the auxiliary mechanism (11), the box-type main beam (1) and the No. 2 leg (7). When the No. 1 overhead crane (5) is started to move backward, a reaction force is applied to the box-type main beam (1), so that the box-type main beam (1) moves forward to pass through the hole.

8. The assembled box-type main beam integrated bridge erecting machine according to claim 1, characterized in that: When erecting a box beam, the No. 3 support leg (8) is suspended in the air, and the No. 1 support leg (6), the No. 2 support leg (7), and the No. 4 support leg (9) are supported. When erecting a span of four box beams, the No. 3 support leg (8) is suspended in the air near the No. 2 support leg (7), and the beam transport vehicle directly enters the lower part of the entire bridge erection machine, firstly erects two middle beams, and then erects the side beams. When erecting the side beams, the bottom lifting is carried out, and the overhead crane lifts the side beam to a suitable position, and the No. 3 support leg (8) retreats to the No. 4 support leg (9) to stand, and the No. 1 support leg (6) and the No. 4 support leg (9) are suspended in the air. At this time, the whole machine and the side beam are supported by the No. 2 support leg (7) and the No. 3 support leg (8). The No. 2 support leg (7) and the No. 3 support leg (8) are operated to move horizontally as a whole until the side beam is erected. The overhead crane moves forward with the side beam, and finally drops the beam. The erection of the other side beam is the same.

9. A through-hole construction method using the assembled box-type main beam integrated bridge erecting machine according to claim 7, characterized in that: The process includes the following: S1. After installing the prefabricated box girder in the rear span operation area, comprehensively check the structure and system safety status of the bridge erection machine, and loosen the main beam anchoring device (10); S2, the No. 1 overhead crane (5) is located above the No. 1 support leg (6), the No. 2 overhead crane (3) moves along the box-shaped main beam (1) to above the No. 3 support leg (7), supported by the No. 4 support leg (9), the No. 3 support leg (8) is suspended in the air, moves forward and is finally supported on the top surface of the box beam near the No. 2 support leg (7), and the No. 3 support leg (8) is anchored to the main beam through the main beam anchoring device (10); S3, the No. 1 overhead crane (5) and the No. 2 overhead crane (3) move to the top of the No. 3 support leg (8), the No. 2 support leg (7) is suspended in the air, moves forward to the top of the box girder near the No. 1 support leg (6) and provides support, and the No. 2 support leg (7) is anchored to the main beam as a whole through the main beam anchoring device (10); S4, the No. 1 support leg (6) and the No. 4 support leg (9) are suspended in the air, the No. 1 overhead travelling crane (5) is fixed by the hanging wheel mechanism (13) and the longitudinal traction device and the No. 3 support leg (8), and the No. 1 overhead travelling crane (5) is controlled to move backward by a remote wireless remote controller or the driver's cab. Since the No. 1 overhead travelling crane (5) and the No. 3 support leg (8) are fixed as a whole, the force is applied to the box-type main beam (1) as a reaction force, so that the main beam (1) and the No. 1 support leg (6) move forward until the No. 1 support leg (6) moves to the front of the top support of the next span cap beam; S5, support the No. 1 support leg (6), open the longitudinal traction device between the No. 1 overhead crane (5) and the No. 3 support leg (8), open the anchoring device between the No. 2 support leg (7) and the No. 3 support leg (8) and the box girder, fully check the bridge erection machine, and prepare to erect the prefabricated box girder; S6. The bridge erection machine and overhead crane are ready to be in place. The prefabricated box beam is hoisted by using a bottom crane. First, two middle beams are erected, and then two side beams are erected. S7. After the erection is completed, the entire bridge erecting machine returns to the middle of the second leg (7) and the third leg (8), and the bridge erecting machine is fully inspected and prepared to proceed to the next span.

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