A jacking construction method of a railway frame bridge underpassing first transverse movement and then longitudinal movement

Abstract

The application discloses a jacking construction method for a frame bridge under a railway, which comprises the following steps: constructing protection piles near the railway and the highway, and setting the protection piles between the left and right parts of the highway to form a central separation zone, so as to greatly protect the safe operation of the railway and the highway; dividing the highway into the left and right parts according to the traffic direction and constructing the left and right parts in sequence; keeping the other part of the highway normal during the construction of one part; setting an initial jacking position outside the railway before the construction of the frame bridge; using a sliding plate system to jacking the prefabricated frame bridge horizontally to the highway and then turning to jacking longitudinally along the highway direction under the railway; removing the overhead support piles under the railway and jacking during the sky window time; ensuring the stability of the line reinforcement system during the traffic period; and significantly reducing the time of occupying the existing highway, which can be widely used in the construction of the three-dimensional intersection of the reconstruction and expansion highway and the existing railway operation line.

Description

TECHNICAL FIELD

[0001] The present application relates to the civil engineering bridge construction technical field, more particularly, the present application relates to a kind of top-in construction method of railway frame bridge under first horizontal displacement then vertical displacement. BACKGROUND

[0002] At present, with the rapid development of modern economy, highway and railway construction enters high-speed development stage, due to the rapid development of highway and railway, road network will inevitably produce a large number of three-dimensional intersection, whether overpass or underpass, put forward more strict requirements for construction, take large-span frame bridge under railway engineering example is currently less successful, and under the condition of highway reconstruction, under the operation of railway to ensure the safe operation of railway and also ensure that highway uninterrupted traffic, put forward more strict requirements, the current construction method is for the situation that there is no railway under traffic, when construction will completely block the traffic operation of railway under, therefore, for the under construction of the operation of railway under the highway traffic is not applicable.

[0003] Therefore, there is an urgent need to provide a kind of construction method of frame bridge under existing railway bridge, so that when the frame bridge under existing railway bridge is constructed, the railway line can be ensured smooth and stable, thereby ensuring the safety of railway operation, while not interrupting traffic, ensuring the traffic under highway. SUMMARY

[0004] An object of the present application is to solve at least the above problems and to provide at least the advantages to be described later.

[0005] Another object of the present application is to provide a kind of top-in construction method of railway frame bridge under first horizontal displacement then vertical displacement, to solve the technical problem that the existing technology cannot guarantee the traffic under highway in the construction of railway frame bridge under.

[0006] In order to achieve these objects and other advantages according to the present application, a kind of top-in construction method of railway frame bridge under first horizontal displacement then vertical displacement is provided, comprising the following steps:

[0007] S1, the highway under railway is divided into left and right according to the direction of traffic, first, the frame bridge of highway right is constructed, the initial position of top-in is set on the outside of highway right, and the horizontal displacement and vertical displacement top-in route of frame bridge is set, the horizontal displacement top-in route is parallel to the extension direction of railway to highway right, and the vertical displacement top-in route is from highway left to the corresponding position under railway along the extension direction of highway;

[0008] S2, construction of protection pile on the side of highway right close to railway, excavation of working pit on horizontal displacement top-in route, construction of slope protection sheet pile wall, construction of sliding plate system of working pit, construction of back pile and back wall, and prefabrication of frame bridge at top-in initial position;

[0009] S3, during the skylight period, the right traffic of the highway is closed, the left traffic of the highway is kept open, the support piles of the overhead are constructed, the protection piles on both sides of the longitudinal moving and jacking route are constructed, the working pit on the longitudinal moving and jacking route is excavated, the sliding plate system of the working pit is constructed, the back pile and the back wall are constructed;

[0010] S4, the line prestress is released by using a skylight, and the track temperature is locked after the release is completed;

[0011] S5, the railway line corresponding to the right traffic of the highway is overhead;

[0012] S6, the prefabricated frame bridge is placed on the sliding plate system, the jacking equipment is installed and debugged, the prefabricated frame bridge is jacked to the front of the overhead support pile along the transverse jacking route and the longitudinal jacking route in turn by using the back pile and the back wall as the counterforce point, the inside of the existing frame bridge is reinforced in turn, the overhead support piles corresponding to the remaining jacking route are removed in turn, the existing frame bridge is cut, and the remaining earthwork is removed while jacking;

[0013] S7, after jacking in place, the railway ballast is immediately restored, and the pile-slab wall and the foundation pit are backfilled;

[0014] S8, the left traffic of the highway is completed by the same way as the right traffic of the highway.

[0015] Preferably, when the railway line is overhead, an anchoring limit is arranged at the overhead support pile, fixed sleeper piles are erected under slow running conditions, the railway is overhead by using D-shaped convenient beams + transverse beams in three skylight times, the guard rail is removed in the first skylight, the distance between the sleepers is adjusted, the ballast is bagged, the steel sleeper is installed in the second skylight, the rubber pad is placed between the steel rail and the steel sleeper, the D-shaped convenient beam is erected in the third skylight, and the insulation pad is placed on one group of D-shaped convenient beams, and then the transverse beam is erected.

[0016] Preferably, the D-shaped convenient beam is a steel convenient beam, the steel convenient beam comprises a pair of vertically and oppositely arranged longitudinal beams, a row of transverse beams is connected between the pair of longitudinal beams along the length direction, an inclined rod is connected between adjacent transverse beams, a connecting plate and a corbel are respectively arranged between the upper and lower sides of the end of each transverse beam and the corresponding longitudinal beam for reinforcement, and a pair of ballast plates is symmetrically arranged at the bottom of each transverse beam.

[0017] Preferably, a row of the protection piles on the longitudinal jacking route close to the left traffic of the highway are used as the central separation belt between the left traffic of the highway and the right traffic of the highway, and the bored piles are supported.

[0018] Preferably, the sliding plate system comprises a sliding plate, ground anchor beams and guide piers, the ground anchor beams are fixed in the working pit and arranged uniformly and at intervals in the working pit, the sliding plate is horizontally connected to the top of the ground anchor beams and arranged in sequence along the transverse jacking route and the longitudinal jacking route, a row of guide piers is arranged on both sides of the sliding plate, the sliding plate, the ground anchor beams and the guide piers are made of reinforced concrete and cast together, and a gravel cushion is arranged between the bottom of the sliding plate and the ground anchor beams.

[0019] Preferably, the surface of the sliding plate is uniformly and at intervals provided with semicircular grooves, a circular concrete rolling ball is arranged in each groove, the diameter of the concrete rolling ball is slightly smaller than the diameter of the groove, lubricating grease is arranged between the concrete rolling ball and the groove, and the top of the concrete rolling ball is used to abut against the bottom of the prefabricated frame bridge.

[0020] Preferably, the surface of the concrete rolling ball is uniformly provided with semicircular storage grooves along the spherical surface.

[0021] Preferably, a limiting ring with an opening is arranged on the top of each groove in the circumferential direction, the inner side of the limiting ring is connected to a circle of elastic bags, the elastic bag is provided with a feeding valve at the position facing the opening, the inner diameter of the elastic bag on the side facing the center is smaller than the diameter of the groove, the upper end inner diameter of the elastic bag is smaller than the diameter of the concrete rolling ball, the elastic bag is filled with sponge and lubricating grease inside, and oil outlet holes are arranged on the side of the elastic bag facing the center in the circumferential direction at intervals.

[0022] When the prefabricated frame bridge is jacked up on the sliding plate system, the surface of the concrete rolling ball is covered with a layer of lubricating grease and contacts the bottom of the prefabricated frame bridge, the concrete rolling ball is extruded by the force applied by the prefabricated frame bridge through the jacking equipment in sequence along the transverse jacking route and the longitudinal jacking route, the lubricating grease in the elastic bag flows out from the oil outlet holes to supplement the surface of the concrete rolling ball or the storage grooves in contact with the concrete rolling ball.

[0023] Preferably, a circle of mounting grooves is arranged on the side of the limiting ring facing the center, the mounting grooves are arranged in communication with the openings, the side of the elastic bag facing radially outward is filled in and connected in the mounting grooves, the sponge is filled in the area of the elastic bag outside the mounting grooves, and the lubricating grease fills the inside of the elastic bag.

[0024] The present invention has at least the following beneficial effects: The jacking construction method of the underpass railway frame bridge of the present invention, which involves first moving laterally and then longitudinally, constructs protective piles on the side of the working pit near the railway and highway, and the protective piles set between the left and right sides of the highway form a central divider, which greatly protects the safe operation of the railway and highway lines. Before the construction of the precast frame bridge, the initial jacking position is set on the outside of the railway, and the highway is divided into left and right sides according to the traffic direction for sequential construction. While constructing one side, the other side of the highway can be kept open for normal traffic. During the construction process, the sliding plate system is used to cooperate with the jacking of the precast frame bridge, first moving laterally to the highway and then turning to move longitudinally along the highway direction to the underpass of the railway, reducing the occupation time of a single highway. The removal of the overhead support piles under the railway and the jacking construction are carried out during the track opening time, ensuring the stability of the line reinforcement system during traffic. Overall, it significantly reduces the occupation time of existing highways and can be widely used for the grade separation construction of highways and existing railway lines.

[0025] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the jacking construction route for the precast frame bridge of the present invention, which involves first moving laterally and then longitudinally.

[0027] Figure 2 This is a schematic diagram of the prefabricated frame bridge of the present invention arranged at the jacking construction site;

[0028] Figure 3 This is a side view of the prefabricated frame bridge of the present invention during jacking.

[0029] Figure 4 This is a schematic diagram of the structure of a skateboard system according to an embodiment of the present invention;

[0030] Figure 5 for Figure 4 Cross-sectional view along the AA direction;

[0031] Figure 6 for Figure 5 Enlarged structural diagram of the medium elastic capsule;

[0032] Description of the figure: 1-railway center line, 2-highway center line, 201-highway right width, 202-highway left width, 3-precast frame bridge, 301-jacking initial position, 302-horizontal displacement end position, 303-longitudinal displacement end position, 4-anchored shotcrete slope support, 5-earthwork transportation channel, 6-back wall, 701-railway side protection pile, 702-highway side protection pile, 703-overhead support pile, 8-culm pile, 9-back pile, 10-guide pier, 11-jack, 12-D type temporary beam, 13-slide plate, 14-pile board wall, 15-horizontal beam, 16-groove, 17-concrete ball, 18-lubricating grease, 19-storage tank, 20-limiting ring, 21-opening, 22-elastic bag, 23-sponge, 24-oil outlet, 25-mounting groove. DETAILED DESCRIPTION

[0033] The present application will be further described in conjunction with the accompanying drawings so that those skilled in the art can implement it according to the description in the specification.

[0034] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials can be obtained commercially unless otherwise specified; in the description of the present application, the terms "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0035] Combination Figures 1-6 As shown in the figure, the present application provides a jacking construction method for a frame bridge under a railway, which is shown as a whole Figure 1 As shown in the figure, the present application provides a jacking construction method for a frame bridge under a railway, which is shown as a whole

[0036] S1, divide the highway under the railway into left width 202 and right width 201 according to the direction of traffic, first construct the frame bridge on the right width 201 of the highway, set the jacking initial position, i.e. the precast position 301, on the outside of the right width 201 of the highway, and set the frame bridge horizontal displacement and longitudinal displacement jacking route, the horizontal displacement jacking route is parallel to the extension direction of the railway to the right width 201 of the highway, and the longitudinal displacement jacking route is from the right width 201 of the highway along the extension direction of the highway to the corresponding position under the railway. When the precast position 301 is set, it is ensured that it is far away from the railway line and does not affect the highway traffic, and the safety is easy to guarantee.

[0037] S2, construction of the right side of the highway 201 near the railway side of the protective pile 701, the protective pile 701 uses reinforced concrete structure, rotary drilling pile construction; excavate the working pit on the transverse jacking route, and construct the slope protection pile wall 14, set up the earthwork transportation channel 5 on the side of the transverse jacking route away from the railway, slope excavation and anchor jet support 4 near the railway and highway side, hang net anchor spray around the working pit, protect the slope stability, vertical excavation near the protective pile 701 side, then construct the slide plate system of the working pit, construct the back pile 9 and the back wall 6, the back wall 6 and the back pile 9 meet the jacking force requirement after calculation, the back wall 6 uses M10 mortar rubble, the back pile 9 uses concrete structure, precast frame bridge 3 at the initial jacking position, determine the plane position of the frame bridge 3 according to the initial jacking position, precast frame bridge 3 is poured in three times by using full support method.

[0038] S3, construction during the skylight period, close the traffic of the right side of the highway 201, keep the left side of the highway 202 open to traffic, construct the overhead support pile 703 and the protective pile 702 on both sides of the longitudinal jacking route, excavate the working pit on the longitudinal jacking route, construct the slide plate system of the working pit, construct the back pile 9 and the back wall 6 on the back side of the longitudinal jacking route.

[0039] S4, use a skylight to release the line prestress, and lock the rail temperature after the release is completed.

[0040] S5, the railway line corresponding to the right side of the highway 201 is overhead.

[0041] S6, the precast frame bridge falls on the slide plate system, installs and debugs the jacking equipment, calculates the number of jacks 11 according to the maximum jacking force, and prepares the jacking iron, force transmission column, horizontal jacking beam and related instruments and meters needed for jacking, uses the back pile 9 and the back wall 6 as the reaction point, jacks the precast frame bridge to the front of the overhead support pile 703 along the transverse jacking route and the longitudinal jacking route in turn, reinforces the inside of the existing frame bridge, removes the overhead support pile 703 corresponding to the remaining jacking route in turn, cuts the existing frame bridge, and excavates the remaining earthwork while jacking.

[0042] The precast frame bridge is jacked in three stages:

[0043] The first stage, the precast frame bridge 3 is transversely moved (jacked in the direction of the railway) from the initial jacking position 301 to the first stage end point, that is, the initial position 302 of the longitudinal jacking route (jacked in the direction of the highway);

[0044] The second stage, the jacking equipment is transferred to the second stage longitudinal jacking initial position 302, the precast frame bridge 3 is jacked from the longitudinal jacking initial position to 20 cm away from the overhead support pile 703 of the railway, the cantilever part of the horizontal lifting beam 15 is hung on the top plate of the newly built frame bridge 3, and is supported by sleepers;

[0045] The third stage, after the line is overhead, the existing frame bridge is reinforced by full-supporting support, first, the 1# and 2# overhead support piles 703 are removed, the 2m existing frame bridge is removed according to the ring cutting, the remaining soil is removed by top-in and excavation, and the frame bridge monitoring is performed during the top-in process; according to the principle that each removal is not more than 2.0m, the remaining overhead support piles 703 are sequentially removed, and the top-in is completed until the prefabricated frame bridge 3 reaches the end position 303 of the longitudinal moving top-in route.

[0046] S7, after the top-in is in place, the railway ballast is immediately restored, and the pile-slab wall 14 and the foundation pit backfilling are performed.

[0047] S8, the left side 202 of the highway is constructed in the same way as the right side 201 of the highway, and the frame bridge top-in construction is completed.

[0048] The application provides a top-in construction method for a frame bridge under a railway, which is horizontally moved first and then longitudinally moved. Protection piles are constructed near the railway and the highway side in a working pit, which greatly protects the safe operation of the railway and the highway operation line. An initial top-in position is set outside the railway before the prefabricated frame bridge is constructed. The highway is divided into left and right sides according to the traffic direction, and the two sides are sequentially constructed. While one side is constructed, the other side can be kept in normal traffic. In the construction process, the sliding plate system is used to cooperate with the top-in prefabricated frame bridge to be horizontally moved and top-in onto the highway and then be longitudinally moved and top-in along the highway direction to the railway below, which reduces the occupation time of the single highway. The removal and top-in construction of the overhead support piles under the railway are performed by using the three window times, which ensures the stability of the line reinforcement system during the traffic period. The occupation time of the existing highway is significantly reduced as a whole, and the method can be widely used in the construction of the three-dimensional intersection of the reconstruction and expansion highway and the existing railway operation line.

[0049] In another technical solution, as shown in Figures 1-3 When the railway line is overhead, an anchoring and limiting is arranged on the overhead support pile 703, the fixed sleeper pile 8 is erected under slow driving conditions, the railway is overhead by using the D-shaped convenient beam 12+horizontal lifting beam 15 in three window times, the first window removes the guard rail, adjusts the sleeper interval, and fills the ballast, the second window installs the steel sleeper, pads the rubber pad between the steel rail and the steel sleeper, the third window sets one group of D-shaped convenient beam 12, installs the connecting plate and the bracket, pads the insulating pad, the remaining D-shaped convenient beams are the same as the first group, and the horizontal lifting beam 15 is erected after the D-shaped convenient beam is erected. The removal and top-in construction of the overhead support piles under the railway are performed by using the three window times, which ensures the stability of the line reinforcement system during the traffic period and improves the construction efficiency.

[0050] In another technical solution, as shown in Figures 1-3As shown, the D-shaped temporary beam is a steel temporary beam, which comprises a pair of vertically and oppositely arranged longitudinal beams, a row of cross beams is connected between the pair of longitudinal beams along the length direction, a diagonal rod is connected between adjacent cross beams, a connecting plate and a corbel are respectively reinforced between the upper and lower sides of the end of each cross beam and the corresponding longitudinal beam, and a pair of ballast stop plates is symmetrically arranged at the bottom of each cross beam.

[0051] In another technical scheme, as shown in Figures 1-3 As shown, a row of the protective piles 702 near the left lane 202 of the highway on the longitudinal moving jacking route is used as a central separation belt between the left lane and the right lane of the highway, and is supported by bored piles. The central separation belt is beneficial to ensure the safety and stability of the normal traffic on the other lane during the single-lane construction of the highway.

[0052] In another technical scheme, as shown in Figures 1-3 As shown, the slide plate system comprises a slide plate 13, an anchor beam and a guide pier 10, the anchor beam is fixed in the working pit and is arranged at uniform intervals in the working pit, the slide plate 13 is horizontally connected to the top of the anchor beam and is sequentially arranged along the transverse jacking route and the longitudinal jacking route, a row of guide piers 10 is arranged on the two sides of the slide plate 13, the slide plate 13, the anchor beam and the guide pier 10 are made of reinforced concrete and are poured together, a gravel cushion is filled between the bottom of the slide plate 13 and the anchor beam, and a lubricating isolation layer is arranged on the surface of the slide plate 13.

[0053] The prefabricated frame bridge is placed on the slide plate 13, the prefabricated frame bridge is moved on the slide plate 13 by the jacking equipment, the slide plate covers the jacking route, and the guide piers 10 limit the moving direction on the two sides of the prefabricated frame bridge, and the lubricating isolation layer is beneficial to the sliding of the prefabricated frame bridge and reduces the bottom friction loss.

[0054] In another technical scheme, as shown in Figures 1-3 As shown, a semicircular groove 16 is uniformly and intervally arranged on the surface of the slide plate 13, a circular concrete rolling ball 17 is arranged in each groove 16, the diameter of the concrete rolling ball 17 is slightly smaller than the diameter of the groove 16, lubricating grease 18 is arranged between the concrete rolling ball 17 and the groove 16, and the top of the concrete rolling ball 17 is used to abut against the bottom of the prefabricated frame bridge 3.

[0055] The concrete rolling ball can slide in any direction. By setting the matching form of the groove and the concrete rolling ball, when the prefabricated frame bridge is jacked, the concrete rolling ball rotates and rolls in the forward direction. The surface is attached to the lubricating grease in the supplementary groove during the rolling process, further reducing the resistance between the prefabricated frame bridge and the sliding plate system during movement, improving the efficiency of jacking movement. When the prefabricated frame bridge is transversely moved, the concrete rolling ball slides along the transverse direction by interacting with the prefabricated frame bridge. When the prefabricated frame bridge is moved in the direction of the highway, the concrete rolling ball slides along the longitudinal direction by interacting with the prefabricated frame bridge. Therefore, no additional adjustment of the orientation of the sliding plate system is required. The jacking force can be directly applied to the prefabricated frame bridge on the upper side of the concrete rolling ball, significantly improving the jacking efficiency.

[0056] In another technical solution, as shown in Figures 1-3 The surface of the concrete rolling ball 17 is uniformly provided with a semicircular storage groove 19 along the spherical surface. By setting a small semicircular storage groove, the ability of the concrete rolling ball surface to attach and retain lubricating grease is further improved.

[0057] In another technical solution, as shown in Figures 1-3 A limiting ring 20 with an opening 21 is provided on the top of each groove 16 in the circumferential direction. The inner side of the limiting ring 20 is connected to a circle of elastic capsules 22. The elastic capsules 22 are provided with a feeding valve at the position facing the opening 21. The inner diameter of the elastic capsules 22 on the side facing the center is smaller than the diameter of the groove 16. The upper end inner diameter of the elastic capsules 22 is smaller than the diameter of the concrete rolling ball 17. The elastic capsules 22 are internally filled with a sponge 23 and lubricating grease 18. Oil outlet holes 24 are provided on the side of the elastic capsules 22 facing the center in the circumferential direction.

[0058] When the prefabricated frame bridge 3 is jacked on the sliding plate system, the surface of the concrete rolling ball 17 is covered with a layer of lubricating grease 18 and is in contact with the bottom of the prefabricated frame bridge 3. By the jacking equipment, the concrete rolling ball is jacked along the transverse jacking route and the longitudinal jacking route in turn. After being subjected to the force applied by the prefabricated frame bridge, the elastic capsules 22 are extruded, and the lubricating grease in the elastic capsules flows out of the oil outlet holes 24 and is supplemented into the storage groove on the surface of the concrete rolling ball or the contact position with the concrete rolling ball.

[0059] The elastic bag is limited by the limiting ring, the installation of the elastic bag is facilitated, the feeding valve is opened to supplement the lubricating grease into the elastic bag from the feeding valve, most of the lubricating grease is inserted into the sponge, the sponge plays a storage role, when the elastic bag is not extruded, the stability of the lubricating grease in the elastic bag is facilitated to be ensured, the lubricating grease cannot easily flow out of the oil outlet, after the elastic bag is installed, on one hand, the concrete rolling ball inside is facilitated to be limited, the concrete rolling ball is prevented from rolling away from the groove of the sliding plate, especially when the concrete rolling ball is subjected to uneven extrusion thrust, such as uneven friction stress between the concrete rolling ball and the bottom of the prefabricated frame bridge, the elastic bag is extruded, the lubricating grease inside the elastic bag can be extruded, the insufficient lubricating grease in the groove is supplemented, or the lubricating grease is directly extruded onto the concrete rolling ball, in this way, the concrete rolling ball can also be quickly supplemented with lubricating grease under a small moving range.

[0060] In another technical solution, as shown in Figures 1-3 The limiting ring is provided with a circle of installation grooves 25 on the side towards the center, the installation grooves 25 are in communication with the opening 21, the side of the elastic bag 22 towards the radial direction is filled and connected in the installation grooves 25, the sponge 23 is filled in the area of the elastic bag 22 outside the installation grooves 25, and the lubricating grease fills the inside of the elastic bag 22.

[0061] After the installation grooves are arranged, the elastic bag is in an L shape in the cross section as a whole, the area of the elastic bag in the installation grooves is mainly filled with lubricating grease, the lubricating grease is facilitated to be supplemented into the sponge, the sponge is mainly located inside the elastic bag and close to the side of the concrete rolling ball, and covers the oil outlet.

[0062] Although the embodiments of the present application have been disclosed as above, they are not limited to the application listed in the specification and the embodiments, and can be fully applied to various fields suitable for the present application, and other modifications can be easily realized by those skilled in the art, therefore, the present application is not limited to specific details and the figures shown and described herein, without departing from the general concept defined by the claims and the equivalent scope.

Claims

1. A jacking construction method of a railway frame bridge underpassing first transverse movement and then longitudinal movement, characterized in that, The method comprises the following steps: S1, the road under the railway is divided into left and right according to the traffic direction, the frame bridge on the right side of the road is constructed first, the initial position of jacking is set on the outside of the right side of the road, and the frame bridge transverse and longitudinal jacking route is set, the transverse jacking route is parallel to the extension direction of the railway to the right side of the road, and the longitudinal jacking route is from the left side of the road to the corresponding position under the railway along the extension direction of the road; S2, the protection pile on the side of the right side of the road close to the railway is constructed, the working pit on the transverse jacking route is excavated, the slope protection sheet pile wall is constructed, the sliding plate system of the working pit is constructed, the back pile and back wall are constructed, and the frame bridge is prefabricated at the initial jacking position; S3, during the construction of the skylight, the traffic on the right side of the road is closed, the traffic on the left side of the road is kept open, the overhead support pile and the protection pile on both sides of the longitudinal jacking route are constructed, the working pit on the longitudinal jacking route is excavated, the sliding plate system of the working pit is constructed, and the back pile and back wall are constructed; S4, one skylight is used for line prestress dissipation, and after the dissipation is completed, the track temperature is locked; S5, the railway line corresponding to the right side of the road is overhead; S6, the prefabricated frame bridge is placed on the sliding plate system, the jacking equipment is installed and debugged, the back pile and back wall are used as the reaction point, the prefabricated frame bridge is jacked to the front of the overhead support pile along the transverse jacking route and the longitudinal jacking route in turn, the existing frame bridge is reinforced, the overhead support piles corresponding to the remaining jacking route are removed in turn, the existing frame bridge is cut, and the remaining soil is removed while jacking; S7, after jacking and positioning, the railway ballast is immediately restored, and the pile and plate wall and foundation pit are backfilled; S8, the left side of the road is constructed in the same way as the right side of the road, and the frame bridge jacking construction is completed; The sliding plate system comprises a sliding plate, and semicircular grooves are uniformly and interval ly arranged on the surface of the sliding plate, a circular concrete rolling ball is arranged in each groove, the diameter of the concrete rolling ball is slightly smaller than the diameter of the groove, lubricating grease is arranged between the concrete rolling ball and the groove, and the top of the concrete rolling ball is used for abutting against the bottom of the prefabricated frame bridge; A limiting ring with an opening is arranged on the top of each groove in the circumferential direction, the inner side of the limiting ring is connected with a circle of elastic capsules, the elastic capsules are provided with a feeding valve at the position facing the opening, the inner diameter of one side of the elastic capsules facing the center is smaller than the diameter of the groove, the upper end inner diameter of the elastic capsules is smaller than the diameter of the concrete rolling ball, the elastic capsules are filled with sponge and lubricating grease, and oil outlet holes are interval ly arranged on the side of the elastic capsules facing the center in the circumferential direction; When the prefabricated frame bridge is jacked on the sliding plate system, the surface of the concrete rolling ball is covered with a layer of lubricating grease and is in contact with the bottom of the prefabricated frame bridge, the concrete rolling ball is extruded after being subjected to the force applied by the prefabricated frame bridge, the lubricating grease in the elastic capsules flows out from the oil outlet holes to supplement the surface of the concrete rolling ball.

2. The jacking construction method of the under-railway frame bridge first transverse and then longitudinal moving of claim 1, wherein, When the railway line is elevated, the anchoring limit is arranged on the elevated support pile, the fixed sleeper pile is erected under slow running condition, the railway is elevated by adopting the form of D-shaped convenient beam + transverse lifting beam in three sky window times, the guard rail is removed in the first sky window, the sleeper interval is adjusted, the ballast is bagged, the steel sleeper is installed in the second sky window, the rubber pad is arranged between the steel rail and the steel sleeper, the D-shaped convenient beam is erected in the third sky window, the insulation pad is arranged on one group of D-shaped convenient beams, and then the transverse lifting beam is erected.

3. The jacking construction method of the under-railway frame bridge moving horizontally first and then moving longitudinally according to claim 2, characterized in that, The D-shaped convenient beam is a steel convenient beam, the steel convenient beam comprises a pair of vertically and oppositely arranged longitudinal beams, a row of cross beams is connected between the pair of longitudinal beams in the length direction, inclined rods are connected between adjacent cross beams, connecting plates and corbels are respectively arranged between the upper and lower sides of the end of each cross beam and the corresponding longitudinal beam for reinforcement, and a pair of ballast retaining plates is symmetrically arranged at the bottom of each cross beam.

4. The jacking construction method of the under-railway frame bridge moving horizontally first and then moving longitudinally according to claim 1, characterized in that, The row of protection piles close to the left side of the highway on the longitudinal moving and pushing route are used as the central separation belt between the left side of the highway and the right side of the highway, and hole drilling pile support is carried out.

5. The jacking construction method of the under-railway frame bridge moving horizontally first and then moving longitudinally according to claim 1, characterized in that, The slide plate system comprises the slide plate, the ground anchor beam and the guide pier, the ground anchor beam is fixed in the working pit and is arranged in uniform intervals in the working pit, the slide plate is horizontally connected at the top of the ground anchor beam and is sequentially arranged in covering mode along the transverse jacking route and the longitudinal jacking route, a row of guide piers is arranged on the two sides of the slide plate, the slide plate, the ground anchor beam and the guide pier adopt a reinforced concrete structure and are poured together, and a gravel cushion layer is filled between the bottom of the slide plate and the ground anchor beam.

6. The jacking construction method of a below-railway frame bridge first transverse and then longitudinal moving of claim 5, wherein, The surface of the concrete rolling ball is uniformly provided with a semicircular storage groove along the spherical surface, and the lubricating grease in the elastic bag flows out from the oil outlet hole and is supplemented into the storage groove on the surface of the concrete rolling ball or the contact position of the concrete rolling ball.

7. The jacking construction method of a below-railway frame bridge first transverse and then longitudinal moving of claim 6, wherein, The limiting ring is provided with a mounting groove on the side towards the center, the mounting groove is in communication with the opening, the radially outer side of the elastic bag is filled in and connected in the mounting groove, the sponge is filled in the area of the elastic bag outside the mounting groove, and the lubricating grease fills the inside of the elastic bag. The limiting ring is provided with a mounting groove on the side towards the center, the mounting groove is in communication with the opening, the radially outer side of the elastic bag is filled in and connected in the mounting groove, the sponge is filled in the area of the elastic bag outside the mounting groove, and the lubricating grease fills the inside of the elastic bag.

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