Large-span railway box bridge jacking overhead construction method and construction equipment thereof

Abstract

The invention relates to a large-span railway box bridge jacking overhead construction method and construction equipment thereof. A jacking working pit is excavated in one side of an existing railway box bridge; a first-stage working pit foundation bottom plate is poured in the pit, and a newly-built railway box bridge is poured on the first-stage working pit foundation bottom plate; an overhead device is erected between the top of the existing railway box bridge and the top of the newly-built railway box bridge, an uplink overhead rail beam and a downlink overhead rail beam at the top of the overhead device are hoisted, and temporary traffic is recovered; a second-stage working pit foundation bottom plate is poured on the inner side of the first-stage working pit foundation bottom plate, and a pushing device is arranged on the outer side of the newly-built railway box bridge; and the newly-built railway box bridge is transversely jacked to the second-stage working pit foundation bottom plate through the jacking device to abut against the existing railway box bridge, and then permanent traffic is recovered. The overhead device between the newly-built railway box bridge and the existing railway box bridge is constructed through the longitudinal and transverse beam system, the length requirement of large-span railway box bridge jacking construction is met, the overall structure is safe and reliable, and construction operation is convenient and easy.

Description

Technical Field

[0001] The invention relates to the technical field of existing bridge reconstruction construction, and in particular to a method for overhead jacking construction of a large-span railway box-type bridge and construction equipment thereof. Background Art

[0002] The low-standard existing railways that have been in operation for a long time can no longer meet the needs of existing transportation, and a large number of existing railways need to be upgraded. Existing railway bridges mostly use small-aperture low-height beams, π-shaped beam bridges, etc., which require structural demolition during reconstruction. Generally, box-type bridge jacking construction methods are used, and D-type temporary beams are used during construction to overhead tracks so that they do not affect railway operations. However, the existing D-type temporary beams include D24 and D32, with lengths of 24.12m and 32.16m respectively. For large spans, their lengths cannot meet the needs of overhead line jacking construction.

[0003] Therefore, it is necessary to propose new measures to overcome the above-mentioned defects. Summary of the invention

[0004] The purpose of the present invention is to provide a method and equipment for the jacking and overhead construction of a large-span railway box bridge, so as to solve the problem that the existing D-type temporary beam is short and cannot meet the requirements of the jacking and overhead construction of a large-span railway box bridge.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A method for jacking and overhead construction of a long-span railway box bridge, the method comprising:

[0007] A jacking working pit is excavated on one side of the existing railway box bridge;

[0008] Cast the first phase working pit base slab in the jacking working pit, and cast the new railway box bridge on the first phase working pit base slab;

[0009] An overhead device is erected between the top of the existing railway box bridge and the top of the newly built railway box bridge, with one end of the overhead device placed on the top plate of the existing railway box bridge and the other end placed on the top plate of the newly built railway box bridge;

[0010] Remove part of the existing structure of the existing railway box bridge, hoist the upline hanging rail beam and the downline hanging rail beam on the top of the overhead device, install the driving track, and restore temporary traffic;

[0011] The second phase working pit base plate is poured inside the first phase working pit base plate in the jacking working pit, and a jacking device is arranged on the outside of the newly built railway box bridge;

[0012] The newly built railway box bridge is pushed horizontally onto the base plate of the second phase working pit by using the jacking device. The newly built railway box bridge is moved horizontally to the bottom of the up line hanging rail beam and close to the existing railway box bridge.

[0013] The overhead and jacking devices were removed, the running tracks and bridge deck auxiliary structures of the newly built railway box bridge were installed, and permanent traffic was restored.

[0014] Further, an overhead device is set up, including:

[0015] I-beam cross beams are erected between the top of the existing railway box bridge and the top of the newly built railway box bridge, and are arranged at equal intervals in the longitudinal direction;

[0016] The I-beam longitudinal beam is fixed on the top of the I-beam cross beam to form a longitudinal and transverse beam system.

[0017] Furthermore, erecting an overhead device also includes:

[0018] A fixed guide pier is arranged on the top of a newly-built railway box bridge. The guide pier is located between two longitudinally adjacent I-beam cross beams. A relative movement channel of the I-beam cross beam is formed between the guide piers on both longitudinal sides of the I-beam cross beam.

[0019] Furthermore, erecting an overhead device also includes:

[0020] A pulley trolley is provided below one end of the I-beam cross beam located at the top of the newly constructed railway box bridge;

[0021] When a new railway box-type bridge is being jacked laterally, the pulley trolley moves relatively on the new railway box-type bridge.

[0022] Furthermore, erecting an overhead device also includes:

[0023] The connection between the I-beam crossbeam and the existing railway box bridge is fixed with a gate-type buckle;

[0024] The door-shaped clip is welded into a door shape by the top I-beam and the I-beams on both sides. The I-beam crossbeam is placed inside the door-shaped clip. The door-shaped clip is fixed to the existing railway box bridge by welding with embedded reinforcement.

[0025] Furthermore, after the overhead device is erected, an S-shaped wing wall is constructed at one end of the overhead device located on the top of the existing railway box bridge for lateral limitation.

[0026] Furthermore, when pouring the first-phase working pit base plate and the second-phase working pit base plate, anchor beams protruding downward are prefabricated at the bottom of both, and the anchor beams are arranged longitudinally.

[0027] Furthermore, when pouring the first-phase working pit base plate and the second-phase working pit base plate, upwardly protruding base plate guide piers are prefabricated on the top of both, and the base plate guide piers are located on both longitudinal sides of the newly built railway box bridge.

[0028] On the other hand, a long-span railway box bridge jacking overhead construction equipment is provided, the construction equipment comprising the overhead device;

[0029] The overhead device comprises a longitudinal and transverse beam system composed of an I-beam cross beam and an I-beam longitudinal beam, one end of the longitudinal and transverse beam system is supported on the top of a newly built railway box bridge through a pulley trolley, and the other end is supported on the top of an existing railway box bridge;

[0030] An up line hanging rail beam and a down line hanging rail beam are arranged on the top of the longitudinal and transverse beam system.

[0031] On the other hand, a jacking overhead construction equipment for a long-span railway box bridge is provided, the construction equipment comprising the jacking device;

[0032] The pushing device includes a concrete back wall, concrete back piles, an I-beam, a force transfer column and a hydraulic jack from the outside to the inside. The concrete back piles are located on the outside of the base plate of the first-phase working pit. The I-beam, the force transfer column and the hydraulic jack are located above the base plate of the first-phase working pit and on the outside of the newly built railway box bridge.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] The present invention provides a method for jacking and overhead construction of a long-span railway box bridge and its construction equipment. The longitudinal and transverse beam system is used to construct an overhead device between a newly built railway box bridge and an existing railway box bridge, which can realize the jacking construction of a long-span railway box bridge and meet the length requirements of the jacking construction of a long-span railway box bridge. The structure is safe and reliable as a whole, easy to install and disassemble, and the construction operation is convenient and simple. In addition, the present invention can use the existing railway box bridge and the newly built railway box bridge as the support points of the I-beam crossbeam, avoiding the risk of bored pile construction on the existing line and improving the safe operation of the existing line. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, drawings of other embodiments can be obtained based on these drawings without paying creative work.

[0036] Figure 1 It is a schematic elevation view of the construction method of the present invention.

[0037] Figure 2 This is a structural elevation diagram of the overhead installation.

[0038] Figure 3It is a plan view of the overhead installation.

[0039] Figure 4 It is a structural elevation diagram of the jacking device.

[0040] Figure 5 This is a schematic diagram of the working pit bottom slab paving layer.

[0041] Figure 6 This is the elevation structure diagram of the door-type buckle.

[0042] The symbols in the figure are:

[0043] 1-existing railway box bridge, 2-new railway box bridge, 3-overhead device, 4-pushing device;

[0044] 31- beam pad, 32- pulley trolley, 33- I-beam cross beam, 34- I-beam longitudinal beam, 35- up line hanging rail beam, 36- down line hanging rail beam, 37- door-type buckle, 38- guide pier, 39- driving track;

[0045] 41-concrete back wall, 42-I-beam, 43-concrete back pile, 44-load transfer column, 45-hydraulic jack, 46-working pit base plate, 47-first phase working pit base plate, 48-second phase working pit base plate;

[0046] 50-crushed stone cushion layer, 51-paraffin oil lubricating layer, 52-plastic sheeting isolation layer, 53-anchor beam, 54-bottom plate guide pier;

[0047] 371-top I-beam, 372-side I-beams. DETAILED DESCRIPTION

[0048] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood.

[0049] In the description of the present invention, it should be understood that the terms "up", "down", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0050] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "set" and the like should be understood in a broad sense, for example, they can be fixedly connected or set, or detachably connected or set, or integrally connected or set. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] It should also be noted that although the order of steps is mentioned in the method description, in some cases, they may be performed in an order different from that shown here, and this should not be construed as a limitation on the order of the steps.

[0052] In a specific implementation, Figure 1 The direction from left to right in the image is defined as the horizontal direction, and the direction perpendicular to it is defined as the vertical direction. Figure 1 The direction from top to bottom is defined as vertical, and the direction perpendicular to it is defined as horizontal.

[0053] After the existing railway box-type bridge 1 has been in service for a long time, due to the small initial design width, the number of driving lines it carries is limited, which limits the transportation volume of the line. When incremental reconstruction is required in the later stage, the number of driving lines of the existing railway box-type bridge 1 needs to be increased, so the lateral width of the existing railway box-type bridge 1 must be widened.

[0054] The present invention provides a method for overhead construction of a large-span railway box bridge to meet the above-mentioned construction needs, which can widen the existing railway box bridge 1, quickly perform incremental reconstruction, and effectively shorten the impact period on existing traffic.

[0055] Specifically, the method includes:

[0056] S1: Excavate a jacking working pit on one side of the existing railway box bridge 1.

[0057] The jacking work pit is located on the side of the newly built railway box bridge 2. The width of the work pit is 1m greater than the width of the box bridge on both sides. The length meets the casting length of the newly built railway box bridge 2 and the working space of the jacking device. The depth of the work pit is flush with the bottom plate of the newly built railway box bridge 2. The working pit is excavated with slopes on both sides, and the side where the jacking device is installed at the rear is hardened with concrete. The bottom of the working pit is treated with concrete and crushed stone, and drainage ditches are set up to meet the drainage requirements during construction.

[0058] S2: Casting the first-phase working pit base plate 47 in the jacking working pit, and casting the newly built railway box bridge 2 on the first-phase working pit base plate 47.

[0059] The first-phase working pit base plate 47 is horizontally cast at the bottom of the jacking working pit. The top of the first-phase working pit base plate 47 is treated with concrete and gravel, and a drainage ditch is set up. The length and width of the first-phase working pit base plate 47 are consistent with the newly built railway box bridge 2, and the thickness meets the settlement requirements of the newly built railway box bridge 2.

[0060] The specific construction process of the new railway box bridge 2 is as follows:

[0061] First, the bottom plate and web reinforcement of the newly built railway box bridge 2 are tied on the base plate 47 of the first-phase working pit, and then the bottom plate and web concrete are poured, and then the top plate reinforcement is tied and the top plate concrete is poured. After the pouring is completed, the concrete is cured.

[0062] S3: An overhead device 3 is erected between the tops of the existing railway box bridge 1 and the newly built railway box bridge 2.

[0063] like Figure 2 The overhead device 3 is an important construction equipment of the present method, including a longitudinal and transverse beam system composed of an I-beam cross beam 33 and an I-beam longitudinal beam 34. One end of the longitudinal and transverse beam system is supported on the top of the newly built railway box bridge 2 through a pulley trolley 32, and the other end is supported on the top of the existing railway box bridge 1. An up-line hanging rail beam 35 and a down-line hanging rail beam 36 are arranged on the top of the longitudinal and transverse beam system.

[0064] Specific:

[0065] S301: An I-beam crossbeam 33 is erected between the top of the existing railway box bridge 1 and the top of the newly built railway box bridge 2. A plurality of I-beam crossbeams 33 are arranged at equal intervals in the longitudinal direction, parallel to each other and at the same height. In addition, crossbeam pads 31 can be added to the bottom of both ends of the I-beam crossbeam 33. The crossbeam pads 31 are located between the bottom of the I-beam crossbeam 33 and the top of the existing railway box bridge 1, and between the bottom of the I-beam crossbeam 33 and the top of the newly built railway box bridge 2. The crossbeam pads 31 are made of piles of sleepers to play a buffering role.

[0066] S302: Fix the I-beam longitudinal beam 34 on the top of the I-beam cross beam 33 to form a longitudinal and transverse beam system, such as Figure 3 The I-beam cross beam 33 and the I-beam longitudinal beam 34 are connected by welding, the I-beam cross beam 33 and the up line hanging rail beam 35 and the down line hanging rail beam 36 are welded to form a whole, and the hanging rail beam and the sleeper are connected by U-bolts to form a whole.

[0067] S303: A fixed guide pier 38 is set on the top of the newly built railway box bridge 2. The guide pier 38 is a small pier body protruding vertically upward, and its horizontal cross section is rectangular. The guide pier 38 is located between two longitudinally adjacent I-beam beams 33. A relative movement channel of the I-beam beam 33 is formed between the guide piers 38 on both sides of the longitudinal direction of the I-beam beam 33, and a relative movement channel of the guide pier 38 is also formed between two longitudinally adjacent I-beam beams 33. When the newly built railway box bridge 2 moves horizontally to the right, the guide pier 38 also moves to the right and moves between the adjacent I-beam beams 33, playing a guiding role in the lateral advancement of the newly built railway box bridge 2. In some embodiments, multiple guide piers 38 can be set horizontally to extend the length of the relative movement channel.

[0068] The guide piers 38 can be prefabricated on the top of the newly built railway box bridge 2 as an integrated structure, and later, the I-beam cross beams 33 are installed one by one across the guide piers 38 .

[0069] S304: A pulley trolley 32 is arranged below one end of the I-beam cross beam 33 located at the top of the newly built railway box-type bridge 2. When the newly built railway box-type bridge 2 is pushed laterally, the pulley trolley 32 moves relatively on the newly built railway box-type bridge 2, which can reduce the friction force on the top of the newly built railway box-type bridge 2 and reduce the thrust required for the laterally pushing forward. Figure 2 The pulley trolley 32 shown in the figure is a simple composition, and its structure is a general trolley structure, which may include a car body and running wheels at the bottom, and the top of the car body is fixed to the bottom of the I-beam cross beam 33.

[0070] S305: The connection between the I-beam cross beam 33 and the existing railway box bridge 1 is fixed by using a door-type buckle 37.

[0071] like Figure 6 The door-shaped buckle 37 is welded into a door shape by a top I-beam 371 and two side I-beams 372, and the I-beam crossbeam 33 is placed inside the door-shaped buckle 37. The door-shaped buckle 37 is fixed to the existing railway box-type bridge 1 by welding with embedded reinforcement.

[0072] S306: After the overhead device 3 is erected, an S-shaped wing wall is constructed at one end of the overhead device 3 located on the top of the existing railway box bridge 1 for lateral limitation. When the overhead device 3 is laterally pushed into the newly built railway box bridge 2, the overhead device 3 will not move laterally to the right.

[0073] S4: dismantle part of the existing structure of the existing railway box bridge 1, including the bridge deck structure and tracks, hoist the upline hanging rail beam 35 and the downline hanging rail beam 36 on the top of the overhead device 3, and install the driving track 39 to resume temporary traffic.

[0074] S5: Cast the second-phase working pit base plate 48 inside the first-phase working pit base plate 47 in the jacking working pit, and arrange the jacking device 4 on the outer side of the newly built railway box bridge 2.

[0075] The second-phase working pit base plate 48 is horizontally cast at the bottom of the jacking working pit and is located between the first-phase working pit base plate 47 and the existing railway box bridge 1. The casting process of the second-phase working pit base plate 48 is referenced to the first-phase working pit base plate 47.

[0076] When pouring the first-phase working pit base plate 47 and the second-phase working pit base plate 48, anchor beams 53 protruding downward are prefabricated at the bottom of both, and the anchor beams 53 are arranged longitudinally. When the new railway box bridge 2 is pushed in transversely, under the action of the anchor beams 53, the first-phase working pit base plate 47 and the second-phase working pit base plate 48 are both laterally limited.

[0077] When pouring the first-phase working pit base plate 47 and the second-phase working pit base plate 48, upwardly protruding base plate guide piers 54 are prefabricated on the top of both. The base plate guide piers 54 are rectangular columns and are located on both longitudinal sides of the newly built railway box-type bridge 2. They can prevent the newly built railway box-type bridge 2 from tilting during the jacking process. When the newly built railway box-type bridge 2 is jacked horizontally, it plays a dual upward and downward guiding role together with the guide piers 38.

[0078] In addition, the first-phase working pit base plate 47 and the second-phase working pit base plate 48 are both cast with enlarged heads near one end of the existing railway box bridge 1 to achieve the effect of strengthening the end. The first-phase working pit base plate 47 and the second-phase working pit base plate 48 together constitute the working pit base plate 46, and a crushed stone cushion layer 50 is arranged under the working pit base plate 46 as an effective foundation treatment measure to meet the settlement requirements of the newly built railway box bridge 2. A paraffin oil lubrication layer 51 and a plastic cloth isolation layer 52 are arranged on the working pit base plate 46, and the newly built railway box bridge 2 is cast on the plastic cloth isolation layer 52. Due to the provision of the paraffin oil lubrication layer 51 and the plastic cloth isolation layer 52, the friction resistance of the newly built railway box bridge 2 is further reduced.

[0079] The jacking device 4 in this step is another important construction equipment of the present method, which includes a concrete back wall 41, a concrete back pile 43, an I-beam 42, a force transfer column 44 and a hydraulic jack 45 from outside to inside, wherein the concrete back pile 43 is located outside the base plate 47 of the first-stage working pit, and the I-beam 42, the force transfer column 44 and the hydraulic jack 45 are located above the base plate 47 of the first-stage working pit and outside the newly built railway box bridge 2. After the hydraulic jack 45 is started, the newly built railway box bridge 2 is jacked laterally toward the direction of the existing railway box bridge 1.

[0080] The concrete back wall 41 is located at the side wall of the jacking working pit, and is jacked from the outside. The concrete back pile 43 is located at the inner side of the concrete back wall 41 .

[0081] S6: Use the jacking device 4 to push the newly built railway box bridge 2 horizontally onto the base plate 48 of the second phase working pit, and move the newly built railway box bridge 2 horizontally to below the up line hanging rail beam 35 and close to the existing railway box bridge 1. The existing railway box bridge 1 and the newly built railway box bridge 2 are combined into a whole, achieving the purpose of widening. After the construction is completed, the roadbed filler is backfilled on both sides of the box bridge as a whole.

[0082] S7: Finally, the overhead device 3 and the jacking device 4 are dismantled, and the driving track 39 and the bridge deck auxiliary structure of the newly built railway box bridge 2 are installed to restore permanent traffic.

[0083] After the construction is completed, the remaining part of the jacking work pit can be directly filled with soil to restore its original appearance.

[0084] The method of the present invention can realize the jacking construction of a large-span railway box bridge, and adopts the longitudinal and transverse beam system of the overhead device, which overcomes the defect of the short length of the D-type temporary beam. The overall structure is safe and reliable, easy to install and disassemble, and the construction operation is convenient and simple. It also uses the existing railway box bridge and the newly built railway box bridge as the support point of the I-beam crossbeam, avoiding the risk of bored pile construction on the existing line and improving the safe operation of the existing line.

[0085] The above specific examples are used to illustrate the present invention, which is only used to help understand the present invention and is not intended to limit the present invention. For those skilled in the art, according to the concept of the present invention, some simple deductions, modifications or substitutions can be made.

Claims

1. A method for jacking and overhead construction of a large-span railway box bridge, characterized in that: The method comprises: A jacking working pit is excavated on one side of an existing railway box bridge (1); Casting a first-stage working pit base plate (47) in the jacking working pit, and casting a newly built railway box bridge (2) on the first-stage working pit base plate (47); An overhead device (3) is erected between the tops of an existing railway box-type bridge (1) and a newly built railway box-type bridge (2), with one end of the overhead device (3) being placed on the top plate of the existing railway box-type bridge (1) and the other end being placed on the top plate of the newly built railway box-type bridge (2); Part of the existing structure of the existing railway box bridge (1) is dismantled, the up-line hanging rail beam (35) and the down-line hanging rail beam (36) on the top of the overhead device (3) are hoisted, and the driving track (39) is installed to restore temporary traffic; A second-phase working pit base plate (48) is poured inside a first-phase working pit base plate (47) in a jacking working pit, and a jacking device (4) is arranged outside a newly built railway box bridge (2); The newly built railway box-type bridge (2) is pushed laterally onto the base plate (48) of the second-phase working pit by using a pushing device (4), and the newly built railway box-type bridge (2) is moved laterally to below the up-line hanging rail beam (35) and close to the existing railway box-type bridge (1); The overhead device (3) and the jacking device (4) are removed, and the driving track (39) and the bridge deck auxiliary structure of the newly built railway box bridge (2) are installed to restore permanent traffic.

2. The method for jacking and overhead construction of a long-span railway box bridge according to claim 1 is characterized in that: Erect an overhead device (3), including: I-beam cross beams (33) are erected between the tops of the existing railway box bridge (1) and the newly built railway box bridge (2) and are arranged at equal intervals in the longitudinal direction; An I-beam longitudinal beam (34) is fixed on the top of the I-beam cross beam (33) to form a longitudinal and transverse beam system.

3. The method for jacking and overhead construction of a long-span railway box bridge according to claim 2 is characterized in that: The overhead device (3) is set up, and further comprises: A fixed guide pier (38) is arranged on the top of a newly built railway box bridge (2), the guide pier (38) being located between two longitudinally adjacent I-beam cross beams (33), and a relative movement channel of the I-beam cross beam (33) is formed between the guide piers (38) on both longitudinal sides of the I-beam cross beam (33).

4. The method for jacking and overhead construction of a long-span railway box bridge according to claim 3 is characterized in that: The overhead device (3) is set up, and further comprises: A pulley trolley (32) is arranged below one end of an I-beam cross beam (33) located at the top of a newly built railway box bridge (2); When the newly built railway box-type bridge (2) is pushed in transversely, the pulley trolley (32) moves relatively on the newly built railway box-type bridge (2).

5. The method for jacking and overhead construction of a long-span railway box bridge according to claim 4 is characterized in that: The overhead device (3) is set up, and further comprises: The connection between the I-beam cross beam (33) and the existing railway box bridge (1) is fixed by a door-shaped buckle (37); The door-shaped buckle (37) is welded into a door shape by a top I-beam (371) and two side I-beams (372); an I-beam crossbeam (33) is placed inside the door-shaped buckle (37); and the door-shaped buckle (37) is fixed to the existing railway box-type bridge (1) by welding with embedded reinforcement.

6. The method for jacking and overhead construction of a long-span railway box bridge according to claim 5 is characterized in that: After the overhead device (3) is erected, an eight-shaped wing wall is constructed at one end of the overhead device (3) located on the top of the existing railway box bridge (1) for lateral limitation.

7. The method for jacking and overhead construction of a long-span railway box bridge according to claim 6 is characterized in that: When pouring the first-phase working pit base plate (47) and the second-phase working pit base plate (48), anchor beams (53) protruding downwards are prefabricated at the bottom of both, and the anchor beams (53) are arranged longitudinally.

8. The method for overhead construction of a long-span railway box bridge according to claim 7 is characterized in that: When pouring the first-phase working pit base plate (47) and the second-phase working pit base plate (48), upwardly protruding base plate guide piers (54) are prefabricated on the tops of both, and the base plate guide piers (54) are located on both longitudinal sides of the newly built railway box bridge (2).

9. Aerial construction equipment for large-span railway box bridges, characterized by: The construction equipment comprises the overhead device (3) as claimed in claim 1; The overhead device (3) comprises a longitudinal and transverse beam system composed of an I-beam cross beam (33) and an I-beam longitudinal beam (34), one end of the longitudinal and transverse beam system is supported on the top of a newly built railway box bridge (2) through a pulley trolley (32), and the other end is supported on the top of an existing railway box bridge (1); An up line hanging rail beam (35) and a down line hanging rail beam (36) are arranged on the top of the longitudinal and transverse beam system.

10. Aerial construction equipment for large-span railway box bridges, characterized by: The construction equipment comprises the jacking device (4) according to claim 1; The jacking device (4) includes, from outside to inside, a concrete back wall (41), a concrete back pile (43), an I-beam (42), a force transfer column (44) and a hydraulic jack (45), wherein the concrete back pile (43) is located on the outside of a first-phase working pit base plate (47), and the I-beam (42), the force transfer column (44) and the hydraulic jack (45) are located above the first-phase working pit base plate (47) and on the outside of a newly built railway box bridge (2).

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