Method for high-speed railway 900-ton beam transport vehicle to carry box beams through small radius curves quickly

Abstract

The present invention provides a method for a high-speed rail 900-ton beam transport vehicle to carry a box beam and quickly pass through a small radius curve, which belongs to the technical field of bridge construction. An extended main beam section is added to the front end of the main beam of the beam transport vehicle, and the extended main beam section wing beam, the extended main beam section running wheel and the running wheel support are arranged on the extended main beam section. After the extended main beam section running wheel is installed, the widths on both sides are narrower than the original running wheel width of the main beam by 1 concave value, so as to ensure that when the beam transport vehicle passes through a small radius curve section, the extended main beam section running wheel is within the track of the original running wheel of the main beam when turning. The method can expand the scope of use of the domestic standard 900-ton beam transport vehicle, so that the length range of the box beam carried by the vehicle is expanded from 24 meters to 32 meters to 35 meters and above.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge construction, and specifically discloses a method for a high-speed railway 900-ton beam transport vehicle to carry a box beam and quickly pass through a small-radius curve. Background Art

[0002] At present, there are many types of beam transport vehicles for 900-ton box beam transport equipment in my country's high-speed railways, but the structures of many 900-ton box beam transport vehicles are roughly the same. The main load-bearing structure includes the beam transport vehicle main beam, 32 sets of running wheels with a total of 64 tires, 1 driving room at the front and rear, a beam-carrying trolley and a fixed support trolley. The 900-ton box beam transport vehicle with 32 sets of running wheels has basically become a standard structure in China. The standard structure can be seen in Figure 1 .

[0003] The beam transport vehicle with this standard structure has reasonable force and can carry box beams in the length range of 24 meters to 32 meters. It has been verified in the construction of many high-speed railways such as the Wuhan-Guangzhou, Beijing-Shanghai, and Shanghai-Kunming, and has good reliability.

[0004] With the development of society, the length of my country's railway box beams has exceeded 32 meters. Currently, there are 35-meter and 40-meter box beams. The 900-ton beam transporter is not only used for high-speed railways, but also more and more intercity railways are using 900-ton box beam transporters to improve the construction progress. However, the curve radius of intercity railways is much smaller than that of high-speed railways. In the lines with a designed curve radius of less than 400 meters, in order to avoid the tire edge of the beam transporter rolling over the weak stress zone of the box beam (see the weak stress zone) Figure 2 ), it must slow down, and the operator needs to repeatedly adjust the direction and angle of the wheel group before passing, and the speed of travel is extremely slow. According to the field experiment, the beam transporter simulated on-site within a 400-meter radius circle in an open field, neither pressing the line nor turning forward, and the driving speed was very slow, averaging 0.8 kilometers per hour, which is much lower than the designed heavy-load speed (3 kilometers per hour). To carry a 35-meter box beam through a line with a curve radius of less than 400 meters, a 900-ton box beam standard structure beam transporter with 32 sets of tires is no longer competent. The use of narrow wheelbase beam transporters or segmented beam transporters has the disadvantages of high rental costs and incompatibility with the beam feeding of the bridge erection machine, and the bridge erection machine needs to be modified.

[0005] Therefore, it is necessary to study a method that can carry box girders of 35 meters or more and quickly pass through small radius curves. Summary of the invention

[0006] The purpose of the present invention is to provide a method for a high-speed railway 900-ton beam transport vehicle to carry box beams and quickly pass through a small-radius curve, which can expand the scope of use of domestic standard 900-ton beam transport vehicles and extend the length range of the box beams they carry from 24 meters to 32 meters to 35 meters and above.

[0007] The above method for a high-speed railway 900-ton beam transport vehicle to carry a box beam and quickly pass a small radius curve comprises: first, disassembling the front frame cab, the front frame cab cantilever bracket and the outrigger oil cylinder located at the front end of the beam transport vehicle;

[0008] Secondly, an extended main beam section is added to the front end of the main beam of the beam transport vehicle. The extended main beam section is provided with an extended main beam section wing beam, an extended main beam section running wheel and a running wheel support. After the installation of the extended main beam section running wheel, the widths on both sides are narrower than the original running wheel width of the main beam by an inner concave value Q, thereby ensuring that when the beam transport vehicle passes through a small radius curve section, the extended main beam section running wheel is within the track of the original running wheel of the main beam when turning. The inner concave value Q is determined according to the following formula:

[0009]

[0010] Among them: R is the radius of the center line of the on-site curve, which is known; L is the length of the beam transport vehicle, which is known; P is the width of the beam transport vehicle, which is known; L1 is the wheelbase between the extended section running wheels of the main beam and the original running wheels of the main beam, which is known; R1 is the radius of the outer ring track of the original running wheels of the main beam when the beam transport vehicle turns;

[0011] Finally, install the extended section panel and the extended section beam shifting track on the extended section of the main beam according to the original panel and the original beam shifting track of the main beam, and reinstall the disassembled front frame cab, front frame cab cantilever bracket and the outrigger cylinder at the front end of the beam transport vehicle.

[0012] The specific steps include:

[0013] S1: Dismantle the front end mechanism of the beam transport vehicle

[0014] The front-end mechanism includes a front frame cab, a front frame cab cantilever bracket and an outrigger oil cylinder located at the front end of the beam transport vehicle;

[0015] S2: Extended beam transport vehicle main beam

[0016] t1, design of main beam extension section

[0017] The main beam extension section includes the main beam extension section outer web plate, the main beam extension section inner web plate, the wing beam mounting plate, the connecting plate, the main beam extension section upper top plate and the main beam extension section lower bottom plate;

[0018] The top and bottom surfaces of the outer web plate of the main beam extension section and the inner web plate of the main beam extension section are straight line connection surfaces, and the shape of the side surface connecting the top surface and the top surface is consistent with the shape of the front end of the main beam of the beam transport vehicle. The top surfaces of the outer web plate of the main beam extension section and the inner web plate of the main beam extension section are connected through the upper top plate of the main beam extension section, and the bottom surfaces of the outer web plate of the main beam extension section and the inner web plate of the main beam extension section are connected through the lower bottom plate of the main beam extension section. A through hole consistent with the shape of the wing beam mounting plate is opened on the outer web plate of the main beam extension section;

[0019] The wing beam mounting plate is located between the outer web of the main beam extension section and the inner web of the main beam extension section, and is connected to the edge of the through hole through a connecting plate. The concave value of the wing beam mounting plate is the concave value of the running wheel of the main beam extension section:

[0020] t2, dismantle the steel plate on the front end of the main beam of the beam transport vehicle

[0021] t3, connecting the main beam extension section

[0022] The main beam extension sections are used in pairs, and the outer web plate of the main beam extension section, the inner web plate of the main beam extension section, the upper top plate of the main beam extension section, and the lower bottom plate of the main beam extension section are connected to the front end of the main beam of the beam transport vehicle;

[0023] S3: Install the main beam extension wing beam

[0024] Install the wing spar of the main beam extension section on the wing spar mounting plate of the main beam extension section;

[0025] S4: Install the running wheels and supports of the extended section of the main beam

[0026] Install the running wheels and supports of the extended main beam section under the wing beam of the extended main beam section, and install the outrigger cylinders disassembled in step S1 on the outer web of the extended main beam section;

[0027] S5: Install the extended panel, extended beam track, and front cab

[0028] t1, install the extended section panel and the extended section shifting rail on the upper top plate of the extended section of the main beam in the form of the original panel and the original shifting rail of the main beam;

[0029] t2, installing the front frame cab cantilever bracket and the front frame cab disassembled in step S1 as a whole on the wing beam of the extended section of the main beam;

[0030] t3, move the fixed support trolley forward and fix it on the extended section panel;

[0031] S6: Debug

[0032] S7: Carrying box beams through small radius curve sections.

[0033] In step S2, the connecting plate is connected to the outer web of the main beam extension section through a plurality of connecting plate reinforcement braces.

[0034] In step S2, the outer web of the extended section of the main beam, the inner web of the extended section of the main beam, the upper top plate of the extended section of the main beam, the lower bottom plate of the extended section of the main beam and the main beam of the beam transport vehicle are welded or pinned.

[0035] In step S3, the wing spar of the extended main beam section and the wing spar mounting plate are welded or pinned.

[0036] Step S5 also includes, t4, installing the main beam outer steel plate to restore the appearance of the beam transport vehicle.

[0037] The present invention has the following beneficial effects:

[0038] 1. Simply modify the existing beam transporter without affecting the main structure of the beam transporter. The added wing beams, running wheels and other structures are all original beam transporter accessories, which saves costs and is easy to operate;

[0039] 2. It can carry 32-meter box girders and 35-meter and above box girders through small radius curves;

[0040] 3. The pressure of a single running wheel on the beam is reduced, and the overload range of the beam transport vehicle is increased. The operator does not need to repeatedly adjust the direction and angle of the wheel group to pass through, which improves the running speed of the beam transport vehicle through small curve sections. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0042] Figure 1 This is the structural diagram of the current standard 900-ton beam transporter;

[0043] Figure 2 for Figure 1 The heavy load diagram of the 900-ton beam transporter is shown;

[0044] Figure 3 This is the structural diagram of the main beam extension section;

[0045] Figure 4 for Figure 3 A view in the other direction;

[0046] Figure 5 for Figure 3 A view from another direction;

[0047] Figure 6 Schematic diagram of the 900-ton beam transporter after installing the extended main beam section;

[0048] Figure 7 Schematic diagram of the 900-ton beam transporter after installing the extended main beam wing beam;

[0049] Figure 8 for Figure 7 A top view of

[0050] Fig. 9 Schematic diagram of the 900-ton beam transporter after installing the main beam extension section running wheels and their supports;

[0051] Fig.10 for Fig. 9 A top view of

[0052] Fig.11 Schematic diagram of the 900-ton beam transporter after installing the extended panel, extended beam transfer track and front-end mechanism;

[0053] Fig.12 Schematic diagram of restoring the exterior appearance of the 900-ton beam transporter covered with steel plates;

[0054] Fig.13 The trajectory diagram of the inner and outer wheels of the 900-ton beam transport vehicle passing through a small radius curve after installing the extended section of the main beam and the running wheels.

[0055] In the figure: 1-main beam of beam transport vehicle, 2-original wing beam of main beam, 3-original running wheel hook of main beam, 4-original running wheel of main beam, 5-original running wheel steering cylinder of main beam, 6-buffer cylinder, 7-power group, 8-original panel of main beam, 9-original beam shifting track of main beam, 10-beam carrying trolley, 11-fixed support trolley, 12-leg cylinder, 13-front frame cab cantilever bracket, 14-front frame cab, 15-rear frame cab cantilever bracket, 16-rear frame cab;

[0056] A-carried box girder, B-erected box girder, B1-slag retaining wall, B2-weak stress zone, B3-allowable partial load range;

[0057] 31-center line of the on-site curve, 32-original outer ring track of the main beam running wheel when the beam transport vehicle turns, 33-original inner ring track of the main beam running wheel when the beam transport vehicle turns, 34-outermost side of the original wheels of the main beam, 35-outermost side of the running wheels of the extended section of the main beam;

[0058] 21-External web of main beam extension section, 22-Inner web of main beam extension section, 23-Wing beam mounting plate, 24-Connection plate, 25-Upper top plate of main beam extension section, 26-Lower bottom plate of main beam extension section, 27-Connection plate reinforcement brace;

[0059] 41- wing beam of the extended section of the main beam, 42- running wheel of the extended section of the main beam, 43- running wheel hook of the extended section of the main beam, 44- steering cylinder of the running wheel of the extended section of the main beam;

[0060] 51-extended section panel, 52-extended section beam shifting track. DETAILED DESCRIPTION

[0061] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. 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.

[0062] Example 1

[0063] This embodiment provides a method for a high-speed rail 900-ton beam transport vehicle to carry a box beam and quickly pass through a small radius curve. The core of the method is to add running wheels on the basis of the original 32 sets of wheels of the beam transport vehicle. This embodiment takes the addition of 2 sets (1 set on each side) as an example. Of course, the case of adding 4 sets or more running wheels also falls within the scope of protection of the present invention. The stress-bearing weak zone B2 belongs to the weak bearing area of ​​the flange plate of the beam body. Generally, the driving track of each wheel group of the heavy-loaded beam transport vehicle on the beam surface is basically in the main bearing part of the web plate of the erected box beam B beam body, which has no effect on the safety of the beam body. If the beam body passes through a small curved section, due to the small radius of the curve, some wheel groups in the front and rear parts of the beam transport vehicle will be overloaded and travel to the B2 area of ​​the beam body, which is very likely to affect the safety of the beam body. By adding new running wheels, the bearing capacity of each tire is reduced, and the force exerted by the tire on the beam body is reduced accordingly, so that the force exerted by the tire on the beam body is within the bearing range of the beam flange plate, and the overload range B3 of the beam transport vehicle is widened and extended to the weak stress zone B2. The driving channel of the beam transport vehicle is widened accordingly, thereby increasing the beam transport speed and improving construction efficiency. At the same time, the newly added running wheels adopt a narrow wheelbase, that is, the wheel spacing is smaller than the original running wheels, so that the added small-pitch running wheels are within the track of the original running wheels when turning, and the overload range B3 of the beam transport vehicle when turning is also increased.

[0064] Specifically include the following steps.

[0065] S1: Dismantle the front end mechanism of the beam transport vehicle

[0066] The front end mechanism includes a front frame cab 14, a front frame cab cantilever bracket 13 and an outrigger oil cylinder 12 located at the front end of the beam transport vehicle. Specifically:

[0067] t1, disconnect all control circuits, brake pipes, power steering, information transmission systems, etc. between the front frame cab 14 and the beam transport vehicle, and disconnect all control switches between the front frame cab 14 and the main beam 1 of the beam transport vehicle;

[0068] t2, dismantle the connection between the front frame cab cantilever bracket 13 and the original wing beam 2 of the main beam, and then dismantle the front frame cab cantilever bracket 13 and the front frame cab 14 as a whole, and package them for storage;

[0069] t3, dismantle the outrigger oil cylinder 12 in the direction of the front frame cab 14, and seal it for storage.

[0070] S2: Extended beam transport vehicle main beam

[0071] t1, design of main beam extension section

[0072] The main beam extension section includes an outer web plate 21 of the main beam extension section, an inner web plate 22 of the main beam extension section, a spar mounting plate 23, a connecting plate 24, an upper top plate 25 of the main beam extension section, a lower bottom plate 26 of the main beam extension section and a connecting plate reinforcing brace 27; the top and bottom surfaces of the outer web plate 21 of the main beam extension section and the inner web plate 22 of the main beam extension section are straight line connecting surfaces, and the shape of the side surface connecting the top surface and the top surface is consistent with the shape of the front end of the main beam transport vehicle main beam 1, and the top surfaces of the outer web plate 21 of the main beam extension section and the inner web plate 22 of the main beam extension section are connected through the upper top plate 25 of the main beam extension section. The outer web 21 of the main beam extension section and the inner web 22 of the main beam extension section are connected through the lower bottom plate 26 of the main beam extension section. A through hole consistent with the shape of the wing beam mounting plate 23 is opened on the outer web 21 of the main beam extension section. The wing beam mounting plate 23 is located between the outer web 21 of the main beam extension section and the inner web 22 of the main beam extension section, and is connected to the edge of the through hole through a connecting plate 24. The connecting plate 24 is connected to the outer web 21 of the main beam extension section through a plurality of connecting plate reinforcement braces 27, so as to better transfer the force of the main beam to the wing beam mounting plate 23.

[0073] In order to ensure that the additional main beam extension section running wheels 42 are within the track of the original running wheels 4 of the main beam when the beam transport vehicle passes through a small radius curve section, the concave value Q of the wing beam mounting plate 23 is determined according to the following formula:

[0074]

[0075] Among them: R is the radius of the center line of the on-site curve, which is known; L is the length of the beam transport vehicle, which is known; P is the width of the beam transport vehicle, which is known; L1 is the wheelbase between the running wheels of the extended section of the main beam and the original running wheels of the main beam, which is known; R1 is the radius of the outer ring track of the original running wheels of the main beam when the beam transport vehicle turns.

[0076] The wing beam mounting plate 23 may be provided with flange bolt holes for fastening to the main beam extension section wing beam 41, and the two may also be connected in other ways (such as welding, etc.).

[0077] t2, dismantle the steel plate on the front end of the main beam of the beam transport vehicle

[0078] Before connecting the extended section of the main beam, it is necessary to remove the outer steel plate of the main beam 1 of the beam transport vehicle and clean the end part of the main beam in order to connect the extended section of the main beam.

[0079] t3, connecting the main beam extension section

[0080] The main beam extension sections are used in pairs, and the main beam extension section outer web 21, the main beam extension section inner web 22, the main beam extension section upper top plate 25, the main beam extension section lower bottom plate 26 are welded or pinned to the front end of the main beam 1 of the beam transport vehicle.

[0081] S3: Install the main beam extension wing beam

[0082] The main beam extension section wing spar 41 is installed on the wing spar mounting plate 23 of the main beam extension section. The shape of the main beam extension section wing spar 41 is consistent with the original wing spar 2 of the main beam. The main beam extension section wing spar 41 and the wing spar mounting plate 23 can be welded or pinned.

[0083] Because the wing beam mounting plate 23 is concave on the outer web 21 of the main beam extension section, the widths of the two sides of the main beam extension section wing beam 41 after installation are respectively narrower than the width of the original wing beam 2 of the main beam by one concave value.

[0084] S4: Install the running wheels and supports of the extended section of the main beam

[0085] The main beam extension section running wheel 42 and running wheel support, such as the main beam extension section running wheel hook 43 and the main beam extension section running wheel steering cylinder 44, are installed under the main beam extension section wing spar 41. Since the widths of the two sides of the main beam extension section wing spar 41 after installation are narrower than the width of the original wing spar 2 of the main beam by one concave value, the widths of the two sides of the main beam extension section running wheel 42 after installation are also narrower than the width of the original running wheel 4 of the main beam by one concave value.

[0086] The outrigger oil cylinder 12 disassembled in step S1 is then installed on the outer web 21 of the main beam extension section, and its control system is restored.

[0087] S5: Install the extended panel, extended beam track, and front cab

[0088] t1, installing the extended section panel 51 and the extended section shifting rail 52 on the upper top plate of the extended section of the main beam in the form of the original panel of the main beam and the original shifting rail of the main beam;

[0089] t2, the front frame cab cantilever bracket 13 and the front frame cab 14 disassembled in step S1 are integrally installed on the main beam extension section wing beam 41, and then all control circuits, brake pipes, steering assistance, information transmission system, etc. of the front frame cab 14 and the beam transport vehicle are reconnected, and finally all control switches of the front frame cab 14 and the main beam 1 of the beam transport vehicle are connected;

[0090] t3, move the fixed support trolley 11 forward by one running wheelbase and fix it on the extended section panel 51;

[0091] t4, install the main beam outer steel plate and restore the appearance of the beam transport vehicle.

[0092] S6: Debug

[0093] After the installation of the extended section main beam, the extended section wing beam 41 of the main beam, the extended section running wheel 42 of the main beam, the outrigger cylinder 12, the extended section panel 51, and the extended section beam shifting track 52 is completed and the front frame cab cantilever bracket 13 and the front frame cab 14 are restored, the following items need to be debugged:

[0094] Debug the running wheel drive and steering, brake system, support cylinder control system, as well as the original front frame cab cantilever bracket 13 and the front frame cab 14 for the overall control and connection of the beam transport vehicle. After the debugging is completed, the beams can be transported normally.

[0095] S7: Carrying box beams through small radius curve sections.

[0096] Taking the transportation of a 32-meter box girder through a small radius curve section as an example, the beam-carrying trolley 10 is moved to a position away from the fixed support trolley 11 for carrying the 32-meter box girder, and then the 32-meter box girder is loaded onto the beam transport vehicle. As described in the principle of the present invention, since the beam transport vehicle has two new sets of running wheels, and the newly added running wheels do not affect the running trajectory of the original beam transport vehicle when turning, the overload range B3 of the beam transport vehicle when turning is increased, and the beam can be transported through a small radius curve at the original design speed of the beam transport vehicle.

[0097] Taking the transportation of a 35-meter beam through a small radius curve section as an example, the beam-carrying trolley 10 is moved to a position away from the fixed support trolley 11 for carrying a 35-meter box beam, and then the 35-meter box beam is loaded onto the beam transport vehicle. As described in the principle of the present invention, since the beam transport vehicle has two new sets of running wheels, and the newly added running wheels do not affect the running trajectory of the original beam transport vehicle when turning, the overload range B3 of the beam transport vehicle when turning is increased, and the beam can be transported through a small radius curve at the original design speed of the beam transport vehicle.

[0098] Example 2

[0099] During the construction of an intercity passenger line, the beam yard weighed 700t for a 35m beam. The standard beam transporter used had a deadweight of 280t, a clearance of 8m on the beam surface, a width of 6.7m, and only 0.65m of driving space on both sides of the beam transporter. When the beam transporter was carrying the beam on the bridge, due to the influence of the small radius curve, the beam transporter's route would deviate from the center line of the box beam by 0.25m. At this time, the wheel group on one side of the beam transporter had already traveled to the flange plate of the box beam, and the box beam was eccentrically stressed. When the beam transporter was carrying the beam through the 400m small radius curve section, the minimum distance between the outermost side of the vehicle body and the embedded reinforcement of the slag retaining wall of the beam body was only 0.4m. Excluding the 0.3m stress-bearing weak belts on both sides, the beam transporter could adjust the eccentric load to 0.7m during the movement.

[0100] Through technical transformation, the beam transporter's insert-type variable cross-section was lengthened, and the beam transporter's wheel line was increased from the original 32-axle wheel line to 34-axle wheel line. The added 2-axle wheel groups were located on both sides of the main beam extension section, and the width was reduced to 6.5m, which shared the force on the beam flange plate after the eccentricity of the beam transporter when carrying the beam, and did not affect the passage of the small radius curve section due to the lengthening of the body, so that the eccentric load range of the beam transporter was widened to 1.3m. During the whole line beam transportation process, 260 beams passed through the curve, including 190 35-meter box beams, 40 30-meter box beams, and 30 25-meter box beams. This method was used to complete the small curve section beam transportation. The beam transportation speed through the small curve section reached the designed heavy load speed of 3.2km / h, which increased the beam transportation speed, saved about 20 days of construction period, and saved about 800,000 yuan in construction costs. Finally, the construction task was completed safely and quickly.

[0101] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for a high-speed railway 900-ton beam transport vehicle to transport a box beam quickly through a small radius curve, characterized in that: First, disassemble the front frame cab, the front frame cab cantilever bracket and the outrigger cylinder at the front end of the beam transport vehicle; Secondly, an extended main beam section is added to the front end of the main beam of the beam transport vehicle. The extended main beam section is provided with an extended main beam section wing beam, an extended main beam section running wheel and a running wheel support. After the installation of the extended main beam section running wheel, the widths on both sides are narrower than the original running wheel width of the main beam by an inner concave value Q, thereby ensuring that when the beam transport vehicle passes through a small radius curve section, the extended main beam section running wheel is within the track of the original running wheel of the main beam when turning. The inner concave value Q is determined according to the following formula: Among them: R is the radius of the center line of the on-site curve, which is known; L is the length of the beam transport vehicle, which is known; P is the width of the beam transport vehicle, which is known; L1 is the wheelbase between the extended section running wheels of the main beam and the original running wheels of the main beam, which is known; R1 is the radius of the outer ring track of the original running wheels of the main beam when the beam transport vehicle turns; Finally, install the extended section panel and the extended section beam shifting track on the extended section of the main beam according to the original panel and the original beam shifting track of the main beam, and reinstall the disassembled front frame cab, front frame cab cantilever bracket and the outrigger cylinder at the front end of the beam transport vehicle.

2. The method for transporting a box beam by a 900-ton beam transport vehicle for high-speed railways to quickly pass a small radius curve according to claim 1, characterized in that: The steps include: S1: Dismantle the front end mechanism of the beam transport vehicle The front-end mechanism includes a front frame cab, a front frame cab cantilever bracket and an outrigger oil cylinder located at the front end of the beam transport vehicle; S2: Extended beam transport vehicle main beam t1, design of main beam extension section The main beam extension section includes the main beam extension section outer web plate, the main beam extension section inner web plate, the wing beam mounting plate, the connecting plate, the main beam extension section upper top plate and the main beam extension section lower bottom plate; The top and bottom surfaces of the outer web plate of the main beam extension section and the inner web plate of the main beam extension section are straight line connection surfaces, and the shape of the side surface connecting the top surface and the top surface is consistent with the shape of the front end of the main beam of the beam transport vehicle. The top surfaces of the outer web plate of the main beam extension section and the inner web plate of the main beam extension section are connected through the upper top plate of the main beam extension section, and the bottom surfaces of the outer web plate of the main beam extension section and the inner web plate of the main beam extension section are connected through the lower bottom plate of the main beam extension section. A through hole consistent with the shape of the wing beam mounting plate is opened on the outer web plate of the main beam extension section; The wing beam mounting plate is located between the outer web of the main beam extension section and the inner web of the main beam extension section, and is connected to the edge of the through hole through a connecting plate. The concave value of the wing beam mounting plate is the concave value of the running wheel of the main beam extension section: t2, dismantle the steel plate on the front end of the main beam of the beam transport vehicle t3, connecting the main beam extension section The main beam extension sections are used in pairs, and the outer web plate of the main beam extension section, the inner web plate of the main beam extension section, the upper top plate of the main beam extension section, and the lower bottom plate of the main beam extension section are connected to the front end of the main beam of the beam transport vehicle; S3: Install the main beam extension wing beam Install the wing spar of the main beam extension section on the wing spar mounting plate of the main beam extension section; S4: Install the running wheels and supports of the extended section of the main beam Install the running wheels and supports of the extended main beam section under the wing beam of the extended main beam section, and install the outrigger cylinders disassembled in step S1 on the outer web of the extended main beam section; S5: Install the extended panel, extended beam track, and front cab t1, install the extended section panel and the extended section shifting rail on the upper top plate of the extended section of the main beam in the form of the original panel and the original shifting rail of the main beam; t2, installing the front frame cab cantilever bracket and the front frame cab disassembled in step S1 as a whole on the wing beam of the extended section of the main beam; t3, move the fixed support trolley forward and fix it on the extended section panel; S6: Debug S7: Carrying box beams through small radius curve sections.

3. The method for transporting a box beam by a 900-ton beam transport vehicle for high-speed railways to quickly pass a small radius curve according to claim 2, characterized in that: In step S2, the connecting plate is connected to the outer web of the main beam extension section through a plurality of connecting plate reinforcement braces.

4. The method for transporting a box beam by a 900-ton beam transport vehicle for high-speed railways through a small radius curve quickly according to claim 3, characterized in that: In step S2, the outer web of the extended section of the main beam, the inner web of the extended section of the main beam, the upper top plate of the extended section of the main beam, the lower bottom plate of the extended section of the main beam and the main beam of the beam transport vehicle are welded or pinned.

5. The method for transporting a box beam by a 900-ton beam transport vehicle for high-speed railways through a small radius curve quickly according to claim 4, characterized in that: In step S3, the wing spar of the extended main beam section and the wing spar mounting plate are welded or pinned.

6. The method for transporting a box beam by a 900-ton beam transport vehicle for high-speed railway to quickly pass a small radius curve according to claim 2, characterized in that: Step S5 also includes, t4, installing the main beam outer steel plate to restore the appearance of the beam transport vehicle.

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