Bridge girder erection machine turning-around construction method and structure

Abstract

The invention discloses a turn-around construction method and structure of a bridge girder erection machine, and belongs to the technical field of building construction. The bridge girder erection machine turning-around construction method comprises the steps that the center line, the front position line and the rear position line of a girder transporting vehicle are marked; the front supporting legs of the bridge girder erection machine are folded, the beam carrying frame is mounted to the beam transporting vehicle through the gantry crane, the beam transporting vehicle enters the bridge girder erection machine from the lowest position, and the beam carrying frame is fixed to the designated position of the beam transporting vehicle through the beam transporting vehicle; a girder transporting vehicle carries the bridge girder erection machine to a girder field U-turn area at a constant speed, and one person carries out command and multiple persons carry out protection; hoisting the bridge girder erection machine carrying pole beam, lowering the bridge girder erection machine to the bridge floor or the ground, and reversely erecting the bridge. The problems that in the prior art, the field adaptability is poor, and the equipment collaboration is low are solved. According to the method, through site optimization and accurate planning, it is clear that the U-turn site needs to contain the 70m * 100m area, compaction and hardening are conducted in advance according to the roadbed standard, center line marking is supplemented, it is ensured that a girder transporting vehicle and a bridge erecting machine are accurately aligned, and the influence of site limitation on construction is remarkably reduced.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to a bridge erecting machine turning construction method and structure. Background Art

[0002] In the construction of high-speed railways and large bridges, the bridge erection machine is the core equipment responsible for the erection of prefabricated beams. Due to the long construction line and the beam yard being located in the middle of the pipe section, after the erection of a single-direction bridge is completed, the bridge erection machine needs to turn around and transfer to the site for reverse construction. However, the traditional turning method faces multiple technical bottlenecks in actual application:

[0003] Poor site adaptability: The U-turn process requires a large construction site, and the area around the existing line is often restricted by terrain or affected by existing structures, making it difficult to provide a standardized flat area. The existing technology lacks systematic requirements for site hardening and size planning, resulting in low U-turn efficiency and safety hazards.

[0004] Low equipment coordination efficiency: The parameters of the bridge erection machine and the beam transport vehicle are not well matched. For example, the turning radius and load capacity of the beam transport vehicle are not coordinated with the size of the bridge erection machine, resulting in frequent adjustments to the equipment posture during the transport process, which makes the operation complicated. Especially in the process of variable span adjustment and beam frame installation, the traditional method relies on manual experience, and the accuracy is difficult to guarantee, which can easily cause the guide beam to deviate or the support point to become unstable.

[0005] Prominent safety risks: U-turns involve high-altitude lifting and transportation of heavy equipment and mechanical operations in narrow spaces. The existing technology has single safety protection measures (such as relying only on basic warnings), lacks dynamic monitoring and multi-level protection mechanisms, and has a high risk of accidents.

[0006] Redundant construction process: Traditional methods are cumbersome and the links are loosely connected. For example, the bridge crane needs to be disassembled and reassembled many times before going down and up the bridge, which takes a long time. There is a lack of standardized speed control during the transportation process, which can easily cause equipment vibration or structural damage due to sudden stops and starts. Summary of the invention

[0007] The purpose of the present invention is to provide a bridge-erecting machine U-turn construction method and structure. Through site optimization and precise planning, it is clearly required that the U-turn site must include a 70m×100m area, and be compacted and hardened in advance according to the roadbed standard, supplemented by centerline markings, to ensure the precise alignment of the beam transport vehicle and the bridge-erecting machine, significantly reduce the impact of site restrictions on construction, and solve the problems raised in the above-mentioned background technology.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] A bridge erecting machine turning construction method comprises the following steps:

[0010] Step 1: Select a construction site with an area of ​​at least 70m x 100m, compact and harden it according to the roadbed standards, and mark the center line and front and rear position lines of the beam transport vehicle;

[0011] Step 2: Retract the front outrigger of the bridge-erecting machine, move the bridge-erecting machine back 3m, use the hydraulic jack to lift the front outrigger 1.3m, remove the wires of the rear outrigger's running wheels, and drive the trolley forward 29m alone;

[0012] Step 3: Use the gantry crane to load the beam frame onto the beam transport vehicle. The front beam and the rear beam extend forward and backward respectively. The beam transport vehicle drives into the belly of the bridge erecting machine at a constant speed. The beam transport vehicle enters the bridge erecting machine at the lowest position. Use the gantry crane to fix the beam frame to the designated position of the beam transport vehicle.

[0013] Step 4: The beam transport vehicle carries the bridge erecting machine to the turning area of ​​the beam yard at a uniform speed of ≤3km / h, and the turning is completed with the safety measure of one person in command and multiple people for protection;

[0014] Step 5: Use the gantry crane to hoist the shoulder beam of the bridge erection machine, remove the angle steel bolts connecting the guide beam of the bridge erection machine and the supporting points of the beam transport vehicle, and after the beam transport vehicle leaves, lower the bridge erection machine to the bridge deck or the ground, and reverse the operation to get on the bridge;

[0015] Step 6. Dismantle the beam frame and transport it back, adjust the position of the bridge-building machine's legs and guide beams, and complete the positioning and performance testing of the bridge-building machine.

[0016] Preferably, with respect to step 2, the hydraulic jack is of 500-ton class, and the height of the space below the rear guide beam lifted by the front legs meets the requirement of installing the beam carrier frame in the belly of the beam transport vehicle.

[0017] Preferably, with regard to step three, when the pack beam frame is installed, the front end of the front pack beam is raised with sleepers below to avoid interference with the driver's cab of the beam transport vehicle, and the balance of the beam transport vehicle must be ensured when the rear pack beam is extended.

[0018] Preferably, as described in step five, the gantry crane is of 450-ton class, and during hoisting, the guide beam and the support points of the bridge erecting machine are fixed by angle steel bolts, and the No. 1 gantry crane is parked at 9.5m from the rear lifting point of the gantry crane.

[0019] A bridge erecting machine turning construction structure, used to implement a bridge erecting machine turning construction method, comprising:

[0020] The SPJ900 / 32 type bridge erecting machine has a total weight of 520t, an outer dimension of 67.5×19.7×12.2m, an inner net width of 14.1m, and is equipped with height-adjustable front and rear outriggers;

[0021] KSC900 beam transporter, rated load capacity 900t, overall dimensions 40680×6600×3600mm, minimum turning inner diameter 26.5m, empty height 3600mm;

[0022] The beam frame includes a front beam and a rear beam, the overlap length of the front beam and the rear beam is 6.1m, the long leg of the front beam faces the rear of the bridge erecting machine, and the short leg faces the front of the bridge erecting machine;

[0023] Gantry crane, used for lifting beam racks and bridge erection machine shoulder beams, with a rated lifting capacity of 450 tons;

[0024] Hydraulic jack is used for lifting and adjusting the front legs of the bridge erecting machine.

[0025] Preferably, the travel speed of the beam transport vehicle is ≤3km / h, and the beam carrying frame and the beam transport vehicle are connected and fixed by angle steel bolts.

[0026] Preferably, when the guide beam of the bridge erecting machine contacts the supporting point of the pack beam, the verticality error is ≤1 / 400 through the positioning of the diagonal brace and the rail.

[0027] Preferably, after the pack beam frame is installed, the extension length of the front and rear pack beams of the beam transport vehicle is dynamically adjusted according to the safety and balance requirements of the driver's cab.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. Through site optimization and precise planning, the present invention explicitly requires that the turning site must include an area of ​​70m×100m, and must be compacted and hardened in advance according to the roadbed standard, supplemented by centerline markings to ensure accurate alignment of the beam transport vehicle and the bridge erection machine, significantly reducing the impact of site restrictions on construction.

[0030] 2. The present invention adopts a combination of SPJ900 / 32 bridge erecting machine and KSC900 beam transporter. The former has an ultra-long guide beam of 67.5m and an internal net width of 14.1m, while the latter has a minimum turning inner diameter of 26.5m and a rated load of 900t, thereby achieving seamless coordination between equipment and reducing mechanical interference during the turning process.

[0031] 3. The present invention uses a 500-ton hydraulic jack to lift the front outrigger, a gantry crane to accurately lift the beam frame, and angle steel bolts to fix the support points, combined with a uniform speed limit of 3km / h to ensure that the turning process is stable and controllable, and the verticality error is ≤1 / 400.

[0032] 4. The present invention introduces a "one-person command, multi-person protection" mechanism, and cooperates with the dynamic balance adjustment of the pack beam frame, such as raising the sleepers to optimize the extension length of the front pack beam and the rear pack beam, to systematically reduce safety risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the span change of the bridge erecting machine of the present invention;

[0034] Figure 2 It is a schematic diagram of the transport of the pack beam frame of the present invention;

[0035] Figure 3 It is a schematic diagram of the installation of the pack beam frame of the present invention;

[0036] Figure 4 It is a first schematic diagram of the bridge erecting machine and the beam transport vehicle descending the bridge of the present invention;

[0037] Figure 5 A second schematic diagram of the bridge erecting machine and the beam transport vehicle descending from the bridge according to the present invention;

[0038] Figure 6 It is a schematic diagram of disassembling the pack beam frame of the present invention.

[0039] In the figure: 1. Bridge erecting machine; 11. Front outrigger; 2. Beam transporter; 3. Beam carrier; 31. Front beam; 32. Rear beam; 4. Gantry crane; 5. Hydraulic jack; 6. Angle steel. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] In order to solve the problems of poor site adaptability and low equipment coordination in the prior art, this embodiment provides the following technical solutions:

[0042] A bridge erecting machine turning construction method specifically comprises the following steps:

[0043] 1. Site selection

[0044] The site is selected according to the parameters of the SPJ900 / 32 bridge erecting machine 1 and the KSC900 beam transporter 2. Because different construction sites provide different sites, there is no specified size and shape of the site, and the constructor is required to conduct on-site inspection, but the site must include an area of ​​70m*100m.

[0045] The main parameters of SPJ900 / 32 bridge erecting machine 1 and KSC900 beam transporter 2 are shown in Table 1 and Table 2:

[0046] Table 1 Main dimension parameters of SPJ900 / 32 bridge erecting machine

[0047] Serial number project Design performance indicators Remark 1 Total weight of bridge erecting machine 520t Type A 2 Outer dimensions 67.5×19.7×12.2m Length × Width × Height 3 Internal clear width 14.1m 4 Maximum allowable operating slope 18‰ 5 Maximum wind speed allowed for operation Level 6 6 Ambient temperature -20℃～50℃

[0048] Table 2 Main performance parameters of KSC900 beam transport vehicle (2)

[0049]

[0050] 2. Hardening treatment

[0051] The filling of the site is compacted 7 days in advance according to the standards of roadbed construction. After compaction, the center line and front and rear position lines are drawn according to the size of the beam transport vehicle 2.

[0052] 3. Bridge erecting machine 1 changes span

[0053] See also Figure 1 First, two 5-ton hand hoists were used to retract the front outriggers 11, and the bridge erecting machine 1 retreated 3m. A 500-ton hydraulic jack was used to lift the front outriggers 11 1.3m, so that the lower part of the guide beam of the bridge erecting machine 1 could be at a height that allowed the beam transport vehicle 2 to install the beam carrier 3 in its belly. Then the rear outrigger running wheel wires were removed, and the middle vehicle was driven forward 29m alone.

[0054] 4. Transporting the beam frame 3 to the bridge erecting machine 1

[0055] See also Figure 2 The bracket adopts a 450-ton gantry crane 4 to assist in loading. When loading the beam, the front and rear beams 32 should be overlapped by about 6.1m. The front beam 31 should be extended forward as far as possible without obstructing the driver's cab of the beam transport vehicle 2, and the rear beam 32 should be extended backward as far as possible without affecting the driving safety and balance. The front end of the front beam 31 can be padded with sleepers according to the situation so as to raise it and not obstruct the driver's cab. The fixed pedestal, steering pulley, etc. on the beam transport vehicle 2 should be removed. After loading is completed, the beam transport vehicle is driven to the bridge erecting machine 1 at a uniform speed.

[0056] 5. Installation of the beam frame 3

[0057] See also Figure 3 , the beam transport vehicle 2 enters the bridge erecting machine 1 at the lowest position, and the front support beam 31 and the rear support beam 32 are installed to the designated position of the beam transport vehicle 2 by using the No. 1 and No. 2 gantry vehicles in cooperation with manual labor, and connected and fixed with the beam transport vehicle 2. Note that the long leg of the front support beam 31 faces the rear of the bridge erecting machine 1, and the short leg faces the front of the bridge erecting machine 1. Then start the beam transport vehicle 2 to align, and stop when it reaches the correct support guide beam position. When the beam transport vehicle 2 is raised, and the guide beam and the support beam contact the support point, tighten the angle steel 6 bolts to connect and fix.

[0058] Specifically, the gantry car is driven to a position about 18m away from the rear beam 32, and the No. 1 gantry car is driven to the guide beam position where the middle car is located. Remove the lifting rod of the No. 1 hoist, drop the hoist to the top of the middle car beam, install the middle car shoulder beam structure to fix the hoist and the middle car cross beam together, and put the 30mm thick steel pad prepared in advance on the support on the top of the middle car. The beam transport car 2 extends the legs and lifts them up, then lifts the hoist so that the middle car and the guide beam are in close contact, and then installs the shoulder beam at the guide beam to fix it. Fix the track clamps of the two gantry cars; retract the front legs; raise the beam transport car 2 so that the rear car and the front legs 11 are about 10cm away from the top of the original track, and finally the whole machine is carried back to the beam transport yard.

[0059] 6. Transport bridge erecting machine 1 to the beam yard

[0060] After the backpack is installed in place, beam transport vehicle 2 drives towards the beam lifting area of ​​the beam yard, adopting the safety measure of one person in command and multiple people for protection along the way. The driving speed shall not exceed 3km / h, and a constant speed shall be maintained as much as possible. Sudden acceleration, deceleration, and emergency braking without reason are prohibited.

[0061] VII. Bridge erecting machine 1 and beam transporter 2 lower the bridge

[0062] See also Figure 4 , after mechanical calculation and considering the structural dimensions of the guide beam of the bridge erecting machine 1 and the stress points of the steel structure, the lifting point when the gantry crane 4 hoists the bridge erecting machine 1 in a balanced manner is obtained;

[0063] Two gantry cranes 4 install the shoulder beam of the bridge erecting machine 1. After the installation is completed, the bolt connection of the guide beam of the bridge erecting machine 1 and the supporting point of the beam transport vehicle 2 is removed. The No. 1 gantry crane of the bridge erecting machine 1 is parked at 9.5m from the rear lifting point of the gantry crane 4, the bridge erecting machine 1 is hoisted, the beam transport vehicle 2 is driven out, and then the bridge erecting machine 1 is put back on the bridge deck;

[0064] See also Figure 5 , the gantry crane 4 places the shoulder pole beam into the guide beam of the bridge erecting machine 1, without removing the beam support frame 3 on the beam transport vehicle 2. After installing the shoulder pole beam of the beam transport vehicle 2, lift the beam transport vehicle 2 to the ground, place it in position according to the laying-out line and start to remove the lower shoulder pole, and the upper shoulder pole does not need to be lifted down; drop the bridge erecting machine 1 and directly install it to the designated position of the beam transport vehicle 2, retreat the No. 1 overhead crane to the position where the beam transport vehicle 2 is when carrying the bridge erecting machine 1, and when the guide beam and the shoulder beam support points are in contact, tighten the angle steel 6 bolts to connect and fix them.

[0065] 8. U-turn

[0066] Move No. 1 overhead crane back to the position where beam transport vehicle 2 was when carrying bridge-erecting machine 1 and fix it. Beam transport vehicle 2 carrying bridge-erecting machine 1 will make a U-turn at the designated position in the beam yard. The U-turn adopts the safety measure of one person in command and multiple people for protection.

[0067] IX. Beam transport vehicle 2 and bridge erecting machine 1 on the bridge

[0068] The bridge erecting machine 1 and the beam transporter 2 go up the bridge, using the same principle and reverse process to carry out the construction.

[0069] 10. Consignment to the beam erection site

[0070] After the backpack is installed in place, the beam transport vehicle 2 drives towards the beam erection area, adopting the safety measure of one person in command and multiple people for protection along the way. The driving speed shall not exceed 3km / h, and the speed shall be kept constant as much as possible. Sudden acceleration, deceleration and emergency braking without reason are prohibited.

[0071] 11. Dismantle the pack beam frame 3

[0072] See also Figure 6 , lay the positioning rails for the middle car and rear door column of the bridge erecting machine 1, and support the front leg 11, so that the verticality of the front leg 11 is controlled within the range of 1 / 400. The beam transporter 2 slowly descends to separate the pack frame from the bridge erecting machine 1. Remove the pack frame, use the No. 1 and No. 2 overhead cranes to place the pack frame on the beam transporter 2, and exit the beam transporter 2. The beam transporter 2 drives back to the beam yard, and the whole machine is inspected and maintained before preparing to transport beams.

[0073] 12. Bridge erecting machine 1 is in place

[0074] After the beam transporter 2 withdraws, the No. 1 and No. 2 overhead cranes of the bridge erecting machine 1 retreat to the rear end and fix them with a track clamp, lay the running rails of the CRRC, turn off the power supply of the rear door column trolley motor, move the CRRC alone to its original position, lower the front leg 11 jack, stop the guide beam of the bridge erecting machine 1 5 cm away from the CRRC, and after accurate alignment, lower it in place, install the diagonal brace, and power all the trolleys. The cantilever of the bridge erecting machine 1 moves forward to the outer end of the bridge, lower the lower support of the front leg 11, and install the lower structure such as the oil pump of the front leg 11, the oil pump platform, the maintenance platform, the oil pipe, the upper and lower connecting bolts of the front leg 11. Check the bridge erecting machine 1, test various performances, and pass the cantilever through the hole after meeting the standards. At this point, the U-turn is completed and the bridge erecting machine 1 is in a state of waiting for erection.

[0075] Working principle: select a construction site including an area of ​​at least 70m×100m, carry out compaction and hardening treatment according to the roadbed standard, and mark the center line and front and rear position lines of the beam transport vehicle 2; retract the front outrigger 11 of the bridge erection machine 1, and the bridge erection machine 1 retreats 3m, and uses the hydraulic jack 5 to lift the front outrigger 11 by 1.3m, remove the rear outrigger running wheel wire, and drive the middle vehicle forward 29m alone; install the beam frame 3 to the beam transport vehicle 2 through the gantry crane 4, and the front beam 31 and the rear beam 32 extend forward and backward respectively, and the beam transport vehicle 2 travels at a constant speed into the belly of the bridge erection machine 1, and the beam transport vehicle 2 enters the bridge erection machine 1 at the lowest position, and uses a gantry vehicle to fix the beam frame 3 to the specified position of the beam transport vehicle 2.

[0076] The beam transporter 2 carries the bridge erecting machine 1 to the turning area of ​​the beam yard at a uniform speed of ≤3km / h, and the turning is completed by adopting the safety measures of one person in command and multiple people for protection; the shoulder beam of the bridge erecting machine 1 is hoisted by the gantry crane 4, and the bolt connection of the angle steel 6 at the supporting point of the guide beam of the bridge erecting machine 1 and the beam transporter 2 is removed. After the beam transporter 2 leaves, the bridge erecting machine 1 is lowered to the bridge deck or the ground, and the reverse operation is performed to get on the bridge;

[0077] Step 6: dismantle the beam support frame 3 and transport it back, adjust the positions of the legs and guide beams of the bridge erecting machine 1, and complete the positioning and performance testing of the bridge erecting machine 1.

[0078] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0079] While the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that many changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the invention.

Claims

1. A bridge erection machine U-turn construction method, characterized in that: The following steps are involved: Step 1: Select a construction site including an area of ​​at least 70m×100m, compact and harden it according to the roadbed standard, and mark the center line and front and rear position lines of the beam transport vehicle (2); Step 2: Retract the front legs (11) of the bridge erecting machine (1), move the bridge erecting machine (1) back 3m, use the hydraulic jack (5) to lift the front legs (11) 1.3m, remove the wires of the rear legs' running wheels, and drive the trolley forward 29m alone; Step 3: The beam carrier (3) is loaded onto the beam transport vehicle (2) by means of the gantry crane (4), the front beam carrier (31) and the rear beam carrier (32) are extended forward and backward respectively, the beam transport vehicle (2) travels at a constant speed into the belly of the bridge erecting machine (1), the beam transport vehicle (2) enters the bridge erecting machine (1) at the lowest position, and the beam carrier (3) is fixed to the designated position of the beam transport vehicle (2) by means of a gantry crane; Step 4: The beam transport vehicle (2) carries the bridge erecting machine (1) at a uniform speed of ≤3 km / h to the turning area of ​​the beam yard, and completes the turning with the safety measure of one person in command and multiple people for protection; Step 5: hoist the shoulder beam of the bridge erecting machine (1) by means of the gantry crane (4), remove the bolt connection of the guide beam of the bridge erecting machine (1) and the supporting point of the beam transport vehicle (2) with the angle steel (6), after the beam transport vehicle (2) leaves, lower the bridge erecting machine (1) to the bridge deck or the ground, and perform the reverse operation to get on the bridge; Step 6: dismantle the beam support frame (3) and transport it back, adjust the positions of the legs and guide beams of the bridge erecting machine (1), and complete the positioning and performance testing of the bridge erecting machine (1).

2. A bridge erecting machine U-turn construction method according to claim 1, characterized in that: As described in step 2, the hydraulic jack (5) is of 500-ton class, and the front legs (11) lift the lower space of the rear guide beam to a height that meets the requirements for installing the beam carrier (3) in the belly of the beam transport vehicle (2).

3. A bridge erecting machine U-turn construction method according to claim 2, characterized in that: As described in step three, when the pack beam frame (3) is installed, the front end of the front pack beam (31) is raised with sleepers to avoid interfering with the driver's cab of the beam transport vehicle (2), and the balance of the beam transport vehicle (2) needs to be ensured when the rear pack beam (32) is extended.

4. A bridge erecting machine U-turn construction method according to claim 3, characterized in that: As described in step five, the gantry crane (4) is of 450-ton class. During the hoisting, the guide beam and the supporting point of the supporting beam of the bridge erecting machine are fixed by angle steel (6) bolts, and the No. 1 gantry crane is parked at 9.5m from the rear lifting point of the gantry crane (4).

5. A bridge erecting machine U-turn construction structure, used to implement a bridge erecting machine U-turn construction method according to any one of claims 1 to 4, characterized in that: include: The SPJ900 / 32 bridge erecting machine (1) has a total weight of 520 tons, an outer dimension of 67.5×19.7×12.2 meters, an inner net width of 14.1 meters, and is equipped with height-adjustable front outriggers (11) and rear outriggers; KSC900 beam transporter (2), rated load capacity 900t, overall dimensions 40680×6600×3600mm, minimum turning inner diameter 26.5m, unloaded height 3600mm; The beam frame (3) comprises a front beam (31) and a rear beam (32), wherein the overlap length of the front beam (31) and the rear beam (32) is 6.1 m, the long leg of the front beam (31) faces the rear of the bridge erecting machine, and the short leg faces the front of the bridge erecting machine; A gantry crane (4) is used to hoist the beam frame (3) and the shoulder beam of the bridge erection machine, with a rated lifting capacity of 450 tons; The hydraulic jack (5) is used for lifting and adjusting the front legs (11) of the bridge erecting machine.

6. A bridge erecting machine turning construction structure according to claim 5, characterized in that: The travel speed of the beam transport vehicle (2) is ≤3 km / h, and the beam support frame (3) and the beam transport vehicle (2) are connected and fixed by angle steel (6) bolts.

7. A bridge erecting machine turning construction structure according to claim 6, characterized in that: When the guide beam of the bridge erecting machine contacts the supporting point of the supporting beam, the verticality error is made less than or equal to 1 / 400 by positioning the diagonal brace and the rail.

8. A bridge erecting machine turning construction structure according to claim 7, characterized in that: After the pack beam frame (3) is installed, the extension length of the front and rear pack beams (32) of the beam transport vehicle (2) is dynamically adjusted according to the safety and balance requirements of the driver's cab.

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