Method for erecting steel box girder crossing high-speed railway line

Abstract

The invention provides a method for erecting a steel box girder crossing a high-speed railway line, and relates to the technical field of steel box girder erection. The method comprises the steps that two concrete box girders are poured on the front side and the rear side of an original high-speed rail line respectively, and carrying trolleys are installed on the concrete box girders; the assembled steel box girder is temporarily fixed between a front guide girder and a rear guide girder on the concrete box girder on the rear side, and the steel box girder and the rear guide girder are borne by a carrying trolley; and the carrying trolley is used for driving the steel box girder, the front guide girder and the rear guide girder which are temporarily fixed together to move towards the concrete box girder on the front side until the steel box girder is completely located above the vacancy between the two concrete box girders, and girder falling installation is conducted. The number of the walking type jacks can be reduced so as to save the erection cost of the steel box girder crossing a high-speed railway line, and the time for changing the carrying position can be shortened through rapid movement of the carrying trolley, so that the changing efficiency of the carrying position is improved, and then the erection efficiency of the steel box girder is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of steel box girder erection, and in particular to a method for erecting a steel box girder across a high-speed railway line. Background Art

[0002] At present, the newly expanded incoming (outgoing) station lines usually need to cross the existing high-speed railway lines. Walking jacks are usually used for construction across existing railway lines. Since the walking jacks frequently lift and place pads (temporary or permanent pads or blocks) during the process, the construction efficiency is low. Summary of the invention

[0003] The problem solved by the invention is: how to improve the efficiency of erecting steel box girders across high-speed railway lines.

[0004] In order to solve the above problems, the present invention provides a method for erecting a steel box girder across a high-speed railway line, comprising:

[0005] Two concrete box beams are cast on the front and rear sides of the original high-speed railway line, and a pack trolley is installed on the concrete box beams;

[0006] Temporarily fixing the assembled steel box beam between the front guide beam and the rear guide beam on the concrete box beam at the rear side, and carrying the steel box beam and the rear guide beam by the carrying trolley;

[0007] The temporarily fixed steel box beam, the front guide beam and the rear guide beam are driven by the trolley to move toward the front concrete box beam until the steel box beam is completely above the empty space between the two concrete box beams, and then the beam is dropped and installed.

[0008] Optionally, before assembling the steel box girder, the steps include:

[0009] The steel box girder is hoisted in parts on site in a steel box girder assembly area on the concrete box girder.

[0010] Optionally, assembly piers are preset in the assembly area of ​​the steel box girder, and the assembly piers are removed after the steel box girder is assembled to enable the transport trolley to transport the steel box girder.

[0011] Optionally, before the carrying trolley carries the steel box beam and the rear guide beam, the method further comprises:

[0012] A winch is installed on the concrete box beam. The winch is located on a side of the rear guide beam away from the front guide beam. The winch is used to assist in dragging the rear guide beam through a steel wire rope during the carrying process.

[0013] Optionally, before the steel box girder is assembled, a counterweight structure is pre-installed at the bottom of the rear guide beam, and the counterweight structure is temporarily fixed to the concrete box girder.

[0014] Optionally, continuous jacks are respectively arranged on the front guide beam and the rear guide beam, and the continuous jacks are used to hoist the steel box beam.

[0015] Optionally, the steel box girder is provided with a reserved cutting margin, and the cutting margin is used for cutting after the steel box girder is transported to a certain position.

[0016] Optionally, the two concrete box girders are respectively provided with corbels, and the corbels are used for positioning the steel box girder when it is dropped.

[0017] Optionally, in the process of the carrying trolley moving toward the next concrete box girder, the process includes:

[0018] The carrying trolley is arranged again on the next concrete box beam to carry the leading guide beam.

[0019] Optionally, the area between the two adjacent ends of the two concrete box girders encloses the empty space, and in the beam dropping direction, the straight-line distance between the two ends is gradually reduced.

[0020] Compared with the related art, the method for erecting a steel box girder across a high-speed railway line of the present invention, in the process of erecting a steel box girder across a high-speed railway line, after the assembled steel box girder is temporarily fixed between the front guide beam and the rear guide beam, the front guide beam and the rear guide beam can be "equivalent" to two concrete box beams, so as to realize the pre-assembly positioning of the steel box girder. After the steel box girder is temporarily fixed, a carrying trolley installed on the pre-cast concrete box girder is used to carry the steel box girder and the rear guide beam. The movement of the carrying trolley toward the next concrete box girder can realize the movement of the steel box girder toward the next concrete box girder, and during the carrying process The movement of the carrying trolley can shorten the time of changing the carrying position, thereby improving the efficiency of changing the carrying position, so that the beam can be installed after the steel box girder is completely above the empty space between two adjacent concrete box girders. In this way, compared with the method of using walking jacks to push the steel box girder in the related technology, it can not only reduce the number of walking jacks to save the cost of erecting the steel box girder across the high-speed railway line, but also shorten the time of changing the carrying position by utilizing the movement of the carrying trolley, thereby improving the efficiency of changing the carrying position, and then improving the efficiency of erecting the steel box girder. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a flowchart of a method for erecting a steel box girder across a high-speed railway line in an embodiment of the present invention;

[0022] Figure 2It is a schematic diagram of a front guide beam and a rear guide beam in an embodiment of the present invention temporarily fixing a steel box beam and being carried by a pack trolley;

[0023] Figure 3 Schematic diagram of the installation of the winch in the embodiment of the present invention;

[0024] Figure 4 Schematic diagram of the carrying process of the carrying cart in the embodiment of the present invention Figure 1 ;

[0025] Figure 5 Schematic diagram of the carrying process of the carrying cart in the embodiment of the present invention Figure 2 ;

[0026] Figure 6 It is a schematic diagram of a pack trolley installed on a next concrete box beam in an embodiment of the present invention;

[0027] Figure 7 Schematic diagram of a carrying trolley installed on a next concrete box beam carrying a leading beam in an embodiment of the present invention Figure 1 ;

[0028] Figure 8 Schematic diagram of a carrying trolley installed on a next concrete box beam carrying a leading beam in an embodiment of the present invention Figure 2 ;

[0029] Fig. 9 It is a schematic diagram of the steel box girder in the embodiment of the present invention being carried into place;

[0030] Fig.10 It is a schematic diagram of the continuous jack starting to drop the beam in the embodiment of the present invention;

[0031] Fig.11 It is a schematic diagram of the steel box girder in the embodiment of the present invention being dropped into place.

[0032] Description of reference numerals:

[0033] 1-concrete box girder; 2-carrying trolley; 3-steel box girder; 4-front guide beam; 5-rear guide beam; 6-empty space; 7-winch; 8-continuous jack. DETAILED DESCRIPTION

[0034] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0035] In the drawings, the Y axis represents the front and rear positions, and the positive direction of the Y axis (that is, the direction of the arrow of the X axis) represents the front side, and the negative direction of the Y axis (that is, the direction opposite to the positive direction of the Y axis) represents the rear side; in the drawings, the Z axis represents the vertical position, and the positive direction of the Z axis (that is, the direction of the arrow of the Z axis) represents the upper side, and the negative direction of the Z axis (that is, the direction opposite to the positive direction of the Z axis) represents the lower side. It should also be noted that the aforementioned Y axis and Z axis are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0036] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein.

[0037] Combination Figures 1 to 11 As shown, the present invention provides a method for erecting a steel box girder across a high-speed railway line, comprising:

[0038] Step 1: Cast two concrete box beams 1 on the front and rear sides of the original high-speed railway line respectively, and install a pack trolley 2 on the concrete box beams 1;

[0039] Step 2: temporarily fix the assembled steel box beam 3 between the front guide beam 4 and the rear guide beam 5 on the concrete box beam 1 at the rear side, and use the carrying trolley 2 to carry the steel box beam 3 and the rear guide beam 5;

[0040] Step three: Use the pack trolley 2 to drive the temporarily fixed steel box girder 3, front guide beam 4 and rear guide beam 5 toward the front concrete box girder 1 until the steel box girder 3 is completely above the empty space 6 between the two concrete box girders 1, and then install the dropped beam.

[0041] Specifically, when a new high-speed railway line bridge is erected across the high-speed railway line, two concrete box girders 1 are first cast on both sides of the original high-speed railway line along the road direction of the new high-speed railway line, and the space 6 between the two concrete box girders 1 is located above the original high-speed railway line. Figure 2 As shown, a pack trolley 2 is installed on the concrete box girder 1 at the rear (negative direction of the Y axis), and the pack trolley 2 can move forward and backward on the concrete box girder 1 at the rear. The pack trolley 2 can include a vehicle body and a support structure installed on the vehicle body, and the support structure can be a hydraulic cylinder that can be telescopic in the vertical direction. When the pack trolley 2 is installed, a front guide beam 4 and a rear guide beam 5 are also arranged on the concrete box girder 1 at the rear. The front guide beam 4 and the rear guide beam 5 can be pre-supported and fixed by corresponding piers or support pads, such as Figure 2 and Figure 3 As shown, the front guide beam 4 and the rear guide beam 5 can be "equivalent" to two front and rear concrete box beams 1. After the assembled steel box beam 3 is temporarily fixed between the front guide beam 4 and the rear guide beam 5, the steel box beam 3 is equivalent to being pre-connected with the "equivalent" two concrete box beams 1 in advance, and after the temporary fixation, the piers or support pads supporting the front guide beam 4 and the rear guide beam 5 are removed, and the steel box beam 3 and the rear guide beam 5 are supported by a plurality of pack carts 2, as shown in FIG. Figure 4 As shown, the carrying trolley 2 supports the steel box beam 3 and the rear guide beam 5 and then starts to move toward the front concrete box beam 1 to carry the steel box beam 3 and the rear guide beam 5 toward the front concrete box beam 1, as shown in FIG. Figures 4 to 8 As shown, during the carrying process, the front guide beam 4 will first reach the front concrete box beam 1, and after the carrying trolley 2 supporting the steel box beam 3 reaches the front end of the rear concrete box beam 1, the supporting structure on the carrying trolley 2 supporting the steel box beam 3 retracts, and after the carrying trolley 2 supporting the steel box beam 3 moves backward, the supporting structure on the carrying trolley 2 supporting the steel box beam 3 supports the steel box beam 3 again, and then the supporting structure on the carrying trolley 2 supporting the rear guide beam 5 retracts, and after the carrying trolley 2 supporting the rear guide beam 5 moves backward, the supporting The supporting structure of the trolley 2 for the rear guide beam 5 supports the rear guide beam 5 again, and then the trolley 2 for supporting the steel box beam 3 and the trolley 2 for supporting the rear guide beam 5 move toward the front concrete box beam 1 again, so as to gradually carry the steel box beam 3 from the rear concrete box beam 1 to above the empty space 6 between the two concrete box beams 1, that is, align the connection end of the front guide beam 4 and the steel box beam 3 with the rear end of the front concrete box beam 1, and align the connection end of the rear guide beam 5 and the steel box beam 3 with the front end of the rear concrete box beam 1, as shown in FIG. Fig. 9 As shown, after the steel box beam 3 is carried to the top of the empty space 6, the front guide beam 4, the rear guide beam 5 and the carrying trolley 2 are anchored. Figure 10 to Figure 11 As shown, after anchoring, the temporary connection between the steel box girder 3 and the front guide beam 4 and the rear guide beam 5 is released, and the steel box girder 3 is installed by the beam dropping equipment pre-installed on the front guide beam 4 and the rear guide beam 5.

[0042] Therefore, in this embodiment, in the process of erecting a steel box girder across a high-speed railway line, the front guide beam 4 and the rear guide beam 5 can be "equivalent" to two concrete box beams 1 by temporarily fixing the assembled steel box beam 3 between the front guide beam 4 and the rear guide beam 5, so as to realize the pre-assembly positioning of the steel box beam 3. After the steel box beam 3 is temporarily fixed, the steel box beam 3 and the rear guide beam 5 are carried by the carrying trolley 2 installed on the pre-cast concrete box beam 1. The movement of the carrying trolley 2 toward the next concrete box beam 1 can realize the movement of the steel box beam 3 toward the next concrete box beam 1. In the carrying process, the carrying trolley The movement of the vehicle 2 can shorten the time for changing the carrying position, thereby improving the efficiency of changing the carrying position, so that the beam can be installed after the steel box girder 3 is completely above the gap 6 between the two adjacent concrete box girders 1. In this way, compared with the method of using walking jacks to push the steel box girder 3 in the related technology, not only can the number of walking jacks be reduced to save the cost of erecting the steel box girder 3 across the high-speed railway line, but the movement of the carrying trolley 2 can also be used to shorten the time for changing the carrying position, thereby improving the efficiency of changing the carrying position, and then improving the erection efficiency of the steel box girder 3.

[0043] Optionally, before assembling the steel box girder 3, the following steps are included:

[0044] The steel box girder 3 is hoisted in parts on site in the steel box girder assembly area on the concrete box girder 1.

[0045] Specifically, in the factory, the steel box girder 3 is split into multiple parts and manufactured separately. Then, the components of the steel box girder 3 are directly transported to the construction site. At the same time, a steel box girder assembly area is pre-divided on the concrete box girder 1. After the components of the steel box girder 3 are transported to the construction site, the steel box girder 3 is assembled in the steel box girder assembly area by a truck crane at the construction site. In other words, the assembly of the steel box girder 3 is implemented on the concrete box girder 1.

[0046] In this way, before assembling the steel box girder 3, the steel box girder 3 is hoisted on-site in separate parts in the steel box girder assembly area on the concrete box girder 1. On the one hand, it is convenient to transport the steel box girder 3. On the other hand, the space of the steel box girder 3 can be fully utilized in the steel box girder assembly area to assemble the steel box girder 3 on the concrete box girder 1, thereby reducing the requirements of the steel box girder 3 on the construction environment of the construction site, further improving the assembly efficiency of the steel box girder 3, and thus improving the erection efficiency of the steel box girder 3.

[0047] Optionally, assembly pads are preset in the steel box girder assembly area, and the assembly pads are removed after the steel box girder 3 is assembled, so that the carrying trolley 2 can carry the steel box girder 3.

[0048] Specifically, in combination with the previous embodiments, assembly piers are pre-built in the steel box girder assembly area, and the assembly piers can support the front guide beam 4, the rear guide beam 5 and the steel box girder 3, so that the front guide beam 4, the rear guide beam 5 and the steel box girder 3 are in a suspended state after being connected, providing space for the pack cart 2, and then, after the front guide beam 4, the rear guide beam 5 and the steel box girder 3 are pre-installed and connected and the assembly piers are removed, the pack cart 2 bears the overall weight of the front guide beam 4, the rear guide beam 5 and the steel box girder 3.

[0049] In this way, by pre-setting assembly piers in the steel box girder assembly area, the assembly piers can pre-realize the support positioning of the front guide beam 4, the rear guide beam 5 and the steel box girder 3, and can be suspended on the concrete box girder 1 after assembly, so that the carrying cart 2 can be located below the steel box girder 3, and then by removing the assembly piers after the steel box girder 3 is assembled, the carrying cart 2 can carry the steel box girder 3. In this way, the carrying cart 2 is prevented from supporting the steel box girder 3 and the rear guide beam 5 during the assembly process of the front guide beam 4, the rear guide beam 5 and the steel box girder 3, thereby ensuring the stability of the assembly process of the front guide beam 4, the rear guide beam 5 and the steel box girder 3.

[0050] Optionally, before the carrying trolley 2 carries the steel box beam 3 and the rear guide beam 5, the following steps are further included:

[0051] A winch 7 is installed on the concrete box beam 1. The winch 7 is located on the side of the rear guide beam 5 away from the front guide beam 4. The winch 7 is used to assist in dragging the rear guide beam 5 through a steel wire rope during the carrying process.

[0052] Specifically, Figure 3 As shown, the winch 7 is installed at the rear end of the concrete box girder 1, that is, the side of the rear guide beam 5 away from the front guide beam 4. According to the design requirements, the concrete box girder 1 has a certain slope. After the front guide beam 4, the rear guide beam 5 and the steel box girder 3 are assembled, a pulley is installed at the bottom of the rear guide beam 5 near the winch 7. The wire rope on the winch 7 is fixed on the concrete box girder 1 after passing through the pulley of the rear guide beam 5. During the movement of the pack cart 2, the winch 7 gradually releases the rope, and the wire rope can assist in pulling the rear guide beam 5 to prevent the assembled front guide beam 4, the rear guide beam 5 and the steel box girder 3 from sliding off the pack cart 2. In addition, when the pack cart 2 brakes, the winch 7 can retract the rope and can also assist the pack cart 2 in braking.

[0053] In this way, before the carrying cart 2 carries the steel box girder 3 and the rear guide beam 5, a winch 7 is installed on the concrete box girder 1. The winch 7 is located on the side of the rear guide beam 5 away from the front guide beam 4. The winch 7 is used to assist in dragging the rear guide beam 5 through a steel wire rope during the carrying process. The winch 7 can not only prevent the assembled front guide beam 4, rear guide beam 5 and steel box girder 3 from sliding off the carrying cart 2 to improve the stability of the carrying process, but also assist the carrying cart 2 in braking to improve the safety of the carrying process.

[0054] Optionally, before the steel box girder 3 is assembled, a counterweight structure is pre-installed at the bottom of the rear guide beam 5 , and the counterweight structure is temporarily fixed to the concrete box girder 1 .

[0055] Specifically, before assembling the steel box girder 3, a counterweight structure is pre-installed at the bottom of the rear guide beam 5, and the counterweight structure is temporarily fixed to the concrete box girder 1 during the assembly process of the steel box girder 3. After the front guide beam 4, the rear guide beam 5 and the steel box girder 3 are assembled and supported by the carrying trolley 2, the connection between the counterweight structure and the concrete box girder 1 is released.

[0056] In this way, the counterweight structure is pre-installed at the bottom of the rear guide beam 5 and temporarily fixed to the concrete box beam 1. The counterweight structure can prevent the front guide beam 4, the rear guide beam 5 and the steel box beam 3 from tilting forward after being assembled, so as to ensure that the assembled front guide beam 4, the rear guide beam 5 and the steel box beam 3 are in a horizontal state, thereby facilitating the transportation of the carrying cart 2.

[0057] Optionally, continuous jacks 8 are respectively provided on the front guide beam 4 and the rear guide beam 5 , and the continuous jacks 8 are used to hoist the steel box beam 3 to achieve beam lowering.

[0058] Specifically, the continuous jack 8 is respectively mounted on the upper ends of the front guide beam 4 and the rear guide beam 5. The circumferential direction of the continuous jack 8 is fixed and limited by a limit plate to prevent the continuous jack 8 from tipping over. The continuous jack 8 is synchronously controlled by a numerical control synchronization system, and the lowering synchronization error can be ≤1mm, with high control accuracy. The system has dual control of displacement and pressure. When the pressure or displacement of the continuous jack 8 exceeds the set pressure or displacement, the system will alarm and stop, thereby improving the accuracy and safety of beam dropping.

[0059] Optionally, a cutting margin is reserved for the steel box girder 3, and the cutting margin is used for cutting after the steel box girder 3 is transported to the place.

[0060] Specifically, the concrete box beam 1 is cast in advance, and there may be errors in the gap 6 between the two concrete box beams 1, that is, the straight-line distance of the gap 6 is too large or too small. The reserved cutting margin of the steel box beam 3 can compensate for the error of the gap 6 to ensure the construction quality.

[0061] Optionally, the two concrete box girders 1 are respectively provided with corbels, which are used for positioning the steel box girder 3 when it is dropped.

[0062] Specifically, the corbels are pre-installed on the two concrete box girders 1, that is, at both ends of the vacancy 6 in the horizontal direction, and when the steel box girder 3 falls to butt against the corbels, the steel box girder 3 is positioned.

[0063] In this way, by respectively arranging the corbels on the two concrete box girders 1, the corbels are used for positioning the steel box girder 3 when it is dropped, and can provide a beam dropping reference during the process of dropping the steel box girder 3, so as to improve the beam dropping efficiency.

[0064] Optionally, in the process of the carrying trolley 2 moving toward the next concrete box girder 1, the following steps are included:

[0065] A carrying trolley 2 is again arranged on the next concrete box beam 1 to carry the front guide beam 4 .

[0066] Specifically, Figures 5 to 9 As shown, during the carrying process, the front guide beam 4 reaches the front concrete box beam 1 first. By setting the carrying cart 2 again on the next concrete box beam 1 to carry the front guide beam 4, the front guide beam 4 can obtain upward support to avoid the front guide beam 4 from colliding with the front concrete box beam 1 under the influence of gravity.

[0067] In this way, in the process of the carrying cart 2 moving toward the next concrete box girder 1, by setting the carrying cart 2 again on the next concrete box girder 1 to carry the leading guide beam 4, the leading guide beam 4 can be supported on the next concrete box girder 1 to avoid the leading guide beam 4 colliding with the next concrete box girder 1 under the influence of weight, thereby improving the stability of the carrying process.

[0068] Optionally, the area between the two adjacent ends of the two concrete box beams 1 is enclosed to form a space 6, and in the beam dropping direction, the straight-line distance between the two ends is gradually reduced.

[0069] Specifically, the direction of beam dropping is from top to bottom, and the straight-line distance between the two ends of the vacancy 6 in the horizontal direction gradually decreases, that is, the two ends of the vacancy 6 in the horizontal direction form a shape similar to an inverted "eight". When the beam is dropped, the inverted "eight" shape can be engaged and positioned with the steel box beam 3 to further improve the efficiency of beam dropping.

[0070] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A method for erecting a steel box girder across a high-speed railway line, characterized in that: include: Two concrete box beams are cast on the front and rear sides of the original high-speed railway line, and a pack trolley is installed on the concrete box beams; Temporarily fixing the assembled steel box beam between the front guide beam and the rear guide beam on the concrete box beam at the rear side, and carrying the steel box beam and the rear guide beam by the carrying trolley; The temporarily fixed steel box beam, the front guide beam and the rear guide beam are driven by the trolley to move toward the front concrete box beam until the steel box beam is completely above the empty space between the two concrete box beams, and then the beam is dropped and installed.

2. The method for erecting a steel box girder across a high-speed railway line according to claim 1, characterized in that: Before assembling the steel box girder, the following steps are included: The steel box girder is hoisted in parts on site in a steel box girder assembly area on the concrete box girder.

3. The method for erecting a steel box girder across a high-speed railway line according to claim 2, characterized in that: An assembly pier is preset in the assembly area of ​​the steel box girder. After the steel box girder is assembled, the assembly pier is removed to enable the transport trolley to transport the steel box girder.

4. The method for erecting a steel box girder across a high-speed railway line according to claim 1, characterized in that: Before the carrying trolley carries the steel box beam and the rear guide beam, the method further comprises: A winch is installed on the concrete box beam. The winch is located on a side of the rear guide beam away from the front guide beam. The winch is used to assist in dragging the rear guide beam through a steel wire rope during the carrying process.

5. The method for erecting a steel box girder across a high-speed railway line according to claim 1, characterized in that: Before the steel box beam is assembled, a counterweight structure is pre-installed at the bottom of the rear guide beam, and the counterweight structure is temporarily fixed to the concrete box beam.

6. The method for erecting a steel box girder across a high-speed railway line according to claim 1, characterized in that: Continuous jacks are respectively arranged on the front guide beam and the rear guide beam, and the continuous jacks are used for hoisting the steel box beam.

7. The method for erecting a steel box girder across a high-speed railway line according to claim 1, characterized in that: The steel box girder is provided with a reserved cutting margin, and the cutting margin is used for cutting after the steel box girder is transported to the place.

8. The method for erecting a steel box girder across a high-speed railway line according to claim 1, characterized in that: The two concrete box beams are respectively provided with corbels, and the corbels are used for positioning the steel box beam.

9. The method for erecting a steel box girder across a high-speed railway line according to claim 1, characterized in that: In the process of the carrying trolley moving toward the next concrete box girder, the method comprises: The carrying trolley is arranged again on the next concrete box beam to carry the leading guide beam.

10. The method for erecting a steel box girder across a high-speed railway line according to claim 1, characterized in that: The area between the two adjacent ends of the two concrete box beams encloses the empty space, and in the beam dropping direction, the straight-line distance between the two ends is gradually reduced.

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