A method for side-mounted cast-in-place and lateral displacement construction of railway box girders adjacent to existing high-speed railways

Abstract

This application relates to the field of bridge construction technology, and in particular to a method for lateral casting and transverse movement of railway box girders adjacent to existing high-speed railways, comprising: step S1, construction system setup; step S2, casting operation; step S3, transverse movement operation; step S6, girder lowering operation; the construction system includes a support formwork system and a transverse movement system; the transverse movement system includes transverse slippers, transverse slides, and a first temporary support, the transverse slides are symmetrically distributed along the longitudinal direction of the bridge on both sides of the bottom of the railway box girder, the transverse slippers are slidably set on the transverse slides along the transverse direction of the bridge, the transverse slides extend into the space between the piers along the transverse direction of the bridge, and the first temporary support is used to support the transverse slides; step S1 includes: setting up part of the support formwork system on the top surface of the pier, the pier, the transverse movement system and the support formwork system together form a support system for supporting the casting operation of the railway box girder, and using the position of the pad stone on the top surface of the pier to initially locate the casting position of the railway box girder along the longitudinal direction of the bridge.

Description

Technical Field

[0001] This application relates to the field of bridge construction technology, and in particular to a method for side-position casting and lateral movement construction of railway box girders adjacent to existing high-speed railways. Background Technology

[0002] With urban development and construction and the increasing traffic volume, it is inevitable that transportation lines will intersect or run parallel. When box girder construction does not have the conditions for in-situ assembly or hoisting, in order to avoid affecting the operation of the completed line, the existing construction often adopts the method of assembling in a different location and then moving it to its position. However, due to the large volume and weight of the box girder, the use of prefabrication in the beam yard makes it easy for safety accidents to occur during the hoisting process onto the bridge.

[0003] Therefore, there is a need to provide an improved technical solution that addresses the shortcomings of the existing technology. Summary of the Invention

[0004] The purpose of this application is to provide a method for side-mounted casting and lateral movement construction of railway box girders adjacent to existing high-speed railways, so as to solve or alleviate the problems existing in the above-mentioned prior art.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] A method for side-mounted casting and lateral movement construction of railway box girders adjacent to existing high-speed railways, the method comprising:

[0007] Step S1, Construction system setup;

[0008] Step S2, cast-in-place operation;

[0009] Step S3, lateral movement operation;

[0010] Step S6, beam lowering operation;

[0011] The construction system includes a support formwork system and a lateral movement system;

[0012] The lateral movement system includes a lateral sliding shoe, a lateral sliding track, and a first temporary support. The lateral sliding track is symmetrically distributed on both sides of the bottom of the railway box girder along the longitudinal direction of the bridge. The lateral sliding shoe is slidably mounted on the lateral sliding track along the transverse direction of the bridge. The lateral sliding track extends into the space between the bridge piers along the transverse direction of the bridge. The first temporary support is used to support the lateral sliding track.

[0013] Step S1 includes: building a portion of the support formwork system on the top surface of the pier. The pier, the lateral movement system, and the support formwork system together form a support system for supporting the cast-in-place operation of the railway box girder. The initial positioning of the casting position of the railway box girder in the longitudinal direction is achieved by using the position of the pad stone on the top surface of the pier.

[0014] As described above, a method for side-position casting and lateral movement construction of railway box girder adjacent to an existing high-speed railway includes a first lifting device, and multiple first lifting devices are fixedly installed on each of the transverse slippers along the transverse bridge direction.

[0015] The bottom formwork of the support template system and the top of the multiple first lifting devices together form the bottom formwork system of the railway box girder;

[0016] Step S2 includes: after the railway box girder is poured, the inner mold and inner mold support, the side mold and side mold support are removed, the multiple first lifting devices are activated to lift the railway box girder, and the bottom mold and bottom mold support at the top of the transverse slide are removed.

[0017] As described above, in a method for side-mounted casting and lateral movement of railway box girders adjacent to existing high-speed railways, preferably, the support formwork system adopts a disc-lock type full-span support, and the lateral movement system adopts a beam-column type support.

[0018] In the above-described method for side-mounted casting and lateral movement of railway box girders adjacent to existing high-speed railways, preferably, the partial support formwork system is the support formwork system for the wing plate of the railway box girder near the pier.

[0019] The above-described method for lateral casting and transverse relocation of railway box girders adjacent to existing high-speed railways is preferably...

[0020] Step S3 includes: when the remaining 1m of the lateral movement distance is about to be completed, gradually slow down the lateral movement speed and set a first stop on one end of the lateral slide to prevent over-pulling during the lateral movement operation.

[0021] As described above, a method for side-position casting and lateral movement of railway box girder near an existing high-speed railway is preferably provided with a secondary positioning system between the piers corresponding to the railway box girder. The secondary positioning system includes a longitudinal slide, a longitudinal slipper, a second lifting device, and a second temporary support.

[0022] The second temporary support is symmetrically distributed between the piers along the transverse direction of the bridge and is used to support the longitudinal slide rail;

[0023] The longitudinal slide shoe is slidably mounted on the corresponding longitudinal slide rail along the bridge direction, and each longitudinal slide shoe is fixedly equipped with multiple second lifting devices along the bridge direction.

[0024] The longitudinal slide rail is located below the transverse slide rail;

[0025] The construction method also includes:

[0026] Step S4, Secondary Positioning Operation: After the railway box girder is moved laterally into position, the multiple second lifting devices are activated to take over lifting the railway box girder until it is detached from the transverse slide. Then, the longitudinal sliding shoe is activated to move the railway box girder along the bridge direction until it is moved longitudinally into position.

[0027] In the above-described method for side-mounted casting and lateral movement construction of railway box girders adjacent to existing high-speed railways, preferably, the secondary positioning system is fixedly connected to the lateral movement system.

[0028] The method for side-mounted casting and lateral movement of railway box girders adjacent to existing high-speed railways, as described above, preferably further includes:

[0029] Step S5, Limiting Operation: Install anti-fall beam blocks and support bolts.

[0030] As described above, in a preferred embodiment of the method for lateral casting and transverse movement of a railway box girder adjacent to an existing high-speed railway, step S6 includes: the plurality of second lifting devices descending until the plurality of first lifting devices take over supporting the railway box girder; the plurality of second lifting devices continuing to descend for a first stroke and then stopping; the plurality of first lifting devices descending until the plurality of second lifting devices take over supporting the railway box girder; the plurality of first lifting devices continuing to descend for a first stroke; and so on, until the railway box girder falls onto the bridge pier.

[0031] In the above-described method for side-mounted casting and lateral movement of railway box girders adjacent to existing high-speed railways, preferably, in step S6, the plurality of second lifting devices perform alternating unilateral descent; the plurality of first lifting devices perform alternating unilateral descent.

[0032] Compared with the closest prior art, the technical solution of this application has the following beneficial effects:

[0033] Without affecting the tensioning construction at both ends of the railway box girder, part of the support formwork system is erected on the top surface of the bridge pier along the transverse direction. On the one hand, the position of the pier top surface pad stone can be used to initially locate the pouring position of the railway box girder in the longitudinal direction of the bridge, so as to reduce the amount of subsequent secondary positioning work. On the other hand, the stability of the support formwork system can be improved by connecting the bridge pier. At the same time, the railway box girder can be placed on the bridge pier in advance to reduce the amount of subsequent transverse movement work of the railway box girder. Attached Figure Description

[0034] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. Wherein:

[0035] Figure 1This is a schematic diagram illustrating the construction of a support template system according to some embodiments of this application;

[0036] Figure 2 This is a schematic diagram of the bridge-direction arrangement of the support template system and the transverse movement system provided according to some embodiments of this application;

[0037] Figure 3 A cross-sectional view of the transverse bridge for a lateral movement operation provided according to some embodiments of this application;

[0038] Figure 4 This is a schematic diagram of the planar layout of the transverse movement system and the secondary positioning system provided according to some embodiments of this application.

[0039] Explanation of reference numerals in the attached figures:

[0040] 1. Railway box girder; 2. Support formwork system; 3. Lateral movement system; 4. Lateral slide; 5. Lateral slide shoe; 6. First lifting device; 7. Longitudinal slide; 8. Longitudinal slide shoe; 9. Second lifting device; 10. Pad stone; 11. Pier; 12. Anti-falling beam block; 13. Continuous jack; 14. Reaction seat; 15. Steel strand; 16. Wing plate. Detailed Implementation

[0041] The present application will now be described in detail with reference to the accompanying drawings and embodiments. Various examples are provided by way of explanation and not by way of limitation. In fact, those skilled in the art will recognize that modifications and variations can be made to the present application without departing from the scope or spirit thereof. For example, a feature shown or described as part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desirable that the present application encompass such modifications and variations that fall within the scope of the appended claims and their equivalents.

[0042] In the following description, the terms "first / second / third" are used merely to distinguish similar objects and do not represent a specific order of objects. It is understood that "first / second / third" may be interchanged in a specific order or sequence where permitted, so that the embodiments of this application described herein can be implemented in an order other than that illustrated or described herein.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used herein is for the purpose of describing embodiments of this disclosure only and is not intended to limit this disclosure.

[0044] In the description of this application, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and do not require that this application be constructed and operated in a specific orientation, and therefore should not be construed as limiting this application. The terms "connected," "linked," and "set up" used in this application should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; direct connections or indirect connections through intermediate components; wired connections, radio connections, or wireless communication signal connections. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0045] For clarity, the following terms are defined below:

[0046] Along the bridge direction: along the direction of the bridge's extension, i.e., the bridge's orientation, which is also the longitudinal direction in this text;

[0047] Transverse direction: along the horizontal direction perpendicular to the extension of the bridge, which is the transverse direction in this article.

[0048] The following will be combined with the appendix Figure 1-4 This application provides a more detailed description of a method for the side-mounted casting and lateral movement construction of a railway box girder adjacent to an existing high-speed railway.

[0049] A method for side-mounted casting and lateral movement construction of a railway box girder adjacent to an existing high-speed railway, the construction method including:

[0050] Step S1, Construction system setup;

[0051] Step S2, cast-in-place operation;

[0052] Step S3, lateral movement operation;

[0053] Step S6, beam lowering operation;

[0054] The construction system includes scaffolding and formwork system 2 and lateral movement system 3;

[0055] The transverse sliding system 3 includes a transverse sliding shoe 5, a transverse sliding track 4, and a first temporary support. The transverse sliding track 4 is symmetrically distributed on both sides of the bottom of the railway box girder 1 along the longitudinal direction of the bridge. The transverse sliding shoe 5 is slidably set on the transverse sliding track 4 along the transverse direction of the bridge. The transverse sliding track 4 extends into the space between the piers 11 along the transverse direction of the bridge. The first temporary support is used to support the transverse sliding track 4.

[0056] Step S1 includes: erecting part of the support formwork system 2 on the top surface of the pier 11. The pier 11, the transverse system 3 and the support formwork system 2 together form a support system for supporting the cast-in-place operation of the railway box girder 1. The initial positioning of the casting position of the railway box girder 1 in the longitudinal direction is made by the position of the pad stone 10 on the top surface of the pier 11.

[0057] In a specific embodiment of this application, the support formwork system 2 includes a cast-in-place support and a formwork, wherein the formwork includes a bottom formwork, side formwork, inner formwork, and end formwork, and the formwork is made of 12mm thick bamboo plywood.

[0058] In step S1, without affecting the tensioning construction at both ends of the railway box girder 1, a portion of the support formwork system 2 is erected on the top surface of the pier 11 along the transverse direction of the bridge. On the one hand, the position of the pad stone 10 on the top surface of the pier 11 can be used to initially locate the pouring position of the railway box girder 1 along the bridge direction, thereby reducing the amount of subsequent secondary positioning work. On the other hand, the stability of the support formwork system 2 can be improved by connecting the pier 11. At the same time, the railway box girder 1 can be partially placed on the pier 11 in advance, thereby reducing the amount of subsequent transverse movement work of the railway box girder 1.

[0059] After the scaffolding formwork system 2 is erected, preloading is carried out. The preloading load is not less than 110% of the maximum construction load that the scaffolding can bear. During the preloading of the scaffolding, vertical and horizontal displacement tests are required. The test contents include: foundation settlement deformation, vertical displacement of the scaffolding, horizontal displacement of the top surface of the scaffolding, and deflection of the longitudinal and transverse beams of the scaffolding.

[0060] In step S2, the cast-in-place work includes rebar fabrication and installation, prestressed duct construction, concrete pouring, concrete curing, prestressing construction, anchor sealing, bridge deck auxiliary structure construction, and partial removal of the support formwork system 2. Among these,

[0061] (1) Reinforcing bar fabrication and installation: The reinforcing bars for the beam are centrally fabricated at the steel bar yard next to the cast-in-place beam, facilitating transportation. When cutting the reinforcing bars, the location of welded joints is fully considered according to the acceptance standards, and the number of joints in the same section shall not exceed 50%. The finished reinforcing bars are transported to the construction site by flatbed trucks. After the prestressing of the bottom and side formwork of the beam and the bottom formwork of the flange 16 is completed, the reinforcing bars can be tied and installed. The reinforcing bars are hoisted by a truck crane and tied sequentially from the bottom plate to the top. The beam reinforcing bars should be tied as a whole, first tying the bottom plate and web plate reinforcing bars, and then tying the top plate reinforcing bars. When the beam reinforcing bars collide with the prestressed reinforcing bars, the beam reinforcing bars can be moved or bent appropriately. After the bottom plate and web plate reinforcing bars are tied, the inner formwork can be installed only after inspection and acceptance by the supervising engineer. After the inner formwork is assembled and adjusted, the top plate reinforcing bars are tied.

[0062] (2) Construction of prestressed ducts: Prestressed ducts are formed using 80mm diameter circular galvanized corrugated metal pipes. After the bottom layer of reinforcement in the base slab is tied, the prestressed ducts are laid out, with the ducts perpendicular to the anchor plate along the center line of the bell-shaped pipe. After the ducts are correctly positioned, plastic liners are inserted inside the ducts to ensure no grout leakage during concrete pouring. The plastic liners are rotated during concrete pouring to prevent grout leakage and blockage of the ducts.

[0063] (3) Concrete Construction: The beam concrete is continuously poured and formed in one pour, with a pouring speed not exceeding 1.0 m / h. Concrete pouring follows the sequence of bottom slab first, then web slab, and finally top slab. The bottom slab is poured in layers up to the upper part of the lower chamfer. Before the concrete's fluidity decreases and it begins to set, the web slab concrete is poured in layers, and finally the top slab concrete is poured. In a specific embodiment of this application, the gradient of the cast-in-place simply supported box girder line between piers 52# and 53# is +6‰ (uphill from the lower mileage to the higher mileage), and concrete is poured from pier 52# to pier 53#; the gradient of the cast-in-place simply supported box girder line between piers 58# and 59# is -6‰ (downhill from the lower mileage to the higher mileage), and concrete is poured from pier 59# to pier 58#. That is, the pouring is done using a diagonal segmented, horizontally layered method, and should be completed before the initial setting of the first poured concrete. The diagonal segment length is 4m to 5m, and the horizontal layer thickness is not greater than 30cm.

[0064] (4) Concrete curing: After the concrete is poured, the top surface of the beam is cured by spraying curing liquid, and the box is cured by spraying.

[0065] (5) Prestressed construction: Prestressing is performed after concrete pouring. Before prestressing, high-pressure air is used to blow away dust and debris from the holes. Prestressing should be carried out in two stages: pre-tensioning and final tensioning. Pre-tensioning should be performed when the concrete strength reaches 60% of the design value, after removing the end formwork and loosening the inner formwork. Final tensioning should be performed when the concrete strength and elastic modulus of the beam reach 100% of the design value and the curing age is not less than 10 days. After tensioning is completed, clear markings are made around the 15-ring of the steel strands near the anchorage. After a re-inspection confirms that there are no broken or slipped strands, the anchoring is completed, and the inspection is passed, the excess prestressing tendons at the ends can be cut off. Grouting should be completed within 48 hours of final tensioning. M50 strength grade grouting material is used. The ducts are cleaned first, and then the grouting pipes on the anchor plates at both ends are installed.

[0066] (6) Anchor Sealing: To improve the durability of the structure, the interface between the old and new concrete is roughened before anchor sealing, the anchorage is waterproofed, and a steel mesh is installed at the end. C50 dry-hard shrinkage-compensating concrete is used for the end sealing. After most of the bottom layer concrete is poured, a small portion of the top layer concrete is poured through the pre-reserved pouring holes in the top slab, and then vibrated to compact it and finished in a timely manner.

[0067] In the specific implementation of this application, the railway box girder 1 is moved laterally using a transverse movement system 3. The transverse movement system 3 includes a first temporary support, a transverse slide rail 4, and a transverse slide shoe 5. The first temporary support is a steel pipe column structure, with two first temporary supports symmetrically distributed on both sides of the bottom of the railway box girder 1 along the longitudinal direction of the bridge. The transverse slide rail 4 is welded and fixed to the distribution beam at the top of the steel pipe column structure. The transverse slide rail 4 is manufactured in multiple segments, each segment being 17m long and 800mm high. Adjacent segments are connected by pins and screws to form a flat surface. The transverse slide shoe 5 is welded from I-beams, intermediate connecting steel plates, end plates, side plates, and top and bottom plates. The lower steel plate of the transverse slide shoe 5 forms a groove, in which an MGE sliding plate is embedded, and is connected to the bottom plate of the transverse slide shoe 5 by bolts. In addition to its reinforcing function, the side plates of the transverse slide shoe 5 also serve a guiding and corrective function. The two transverse slide shoes 5 are respectively slidably engaged with the top of the corresponding transverse slide rail 4 through their respective lower grooves.

[0068] In the specific implementation of this application, both transverse sliding shoes 5 are provided with lateral movement force by corresponding two continuous jacks 13. Reaction seats 14 are installed at the ends of the two transverse sliding tracks 4 near the pier 11, and the two continuous jacks 13 are correspondingly fixed at the ends of the transverse sliding shoes 5 away from the reaction seats 14. φ140mm round holes are required at both ends of the transverse sliding shoes 5 to allow the steel strands 15 to pass through. A φ150 galvanized steel pipe is embedded in the connecting steel plate in the middle to facilitate the threading of the steel strands 15. Before lateral movement, grease is applied to the top surface of the transverse slide 4 for lubrication. The steel strand 15 is threaded through the φ150 galvanized steel pipe embedded in the transverse slide 5. Tool anchors and clamps are installed on the reaction seat 14 to fix the steel strand 15. First, a YDC135Q jack is used to pre-tighten the steel strand 15 to a tension of 10kN. After the steel strands 15 threaded through the two transverse slides 5 are pre-tightened, the corresponding continuous jacks 13 are installed.

[0069] The transverse system 3 includes a first lifting device 6, and multiple first lifting devices 6 are fixedly installed on each transverse slipper 5 along the transverse bridge direction.

[0070] The bottom formwork of the support formwork system 2 and the top of the multiple first lifting devices 6 together form the bottom formwork system of the railway box girder 1;

[0071] Step S2 includes: after the railway box girder 1 is poured, the inner mold and inner mold support, side mold and side mold support are removed, multiple first lifting devices 6 are started to lift the railway box girder 1, and the bottom mold and bottom mold support at the top of the transverse slide 4 are removed.

[0072] In step S1, the support formwork system 2 makes way for the transverse moving system 3. One end of the transverse moving system 3 extends into the support formwork system 2 along the transverse bridge direction, and the other end extends between the piers 11. After the multiple first lifting devices 6 are installed, the bottom formwork is then erected, and the bottom formwork and the tops of the multiple first lifting devices 6 form a plane. In a specific embodiment of this application, two first lifting devices 6 are fixedly and spaced apart along the transverse bridge direction on each transverse sliding shoe 5.

[0073] In step S2, by activating multiple first lifting devices 6 to lift the railway box girder 1, on the one hand, the railway box girder 1 can be assisted in demolding, and on the other hand, the lifting of the first lifting devices 6 can actively support the railway box girder 1, thus avoiding the structural stability problems caused by passive support.

[0074] The scaffolding system 2 adopts a disc-lock type full-span scaffolding, while the transverse shift system 3 adopts a beam-column type scaffolding.

[0075] In the specific implementation of this application, the disc-lock type full-span scaffolding is specifically a φ60×3.2mm disc-lock type steel pipe scaffolding, with horizontal scissor bracing fully distributed at intervals of 4 steps. The horizontal spacing of the disc-lock brackets below the flange plate is 120cm, the horizontal spacing of the disc-lock brackets below the web plate is 60cm, and the horizontal spacing of the disc-lock brackets below the bottom plate is 90cm. The diagonal bracing of the disc-lock bracket is fully distributed in both the longitudinal and transverse directions of the bridge. Diagonal support steel pipes are set on the outer side of the web plate, and the support steel pipes are connected and fixed to the uprights of the disc-lock bracket. The ends are provided with diagonal support for the outer formwork using top supports. The beam-column type scaffolding specifically uses φ609×8mm steel pipes. The bottom is connected to the foundation or strip foundation through embedded parts. 4×3703 steel and 5×3703 steel are welded to the top of the steel pipe columns as distribution beams. The connection system between the steel pipe columns uses 20a channel steel and is welded to the steel pipe columns through brackets. The arm is made of 20a channel steel and is welded to the steel pipe columns and the pier body embedded parts through brackets.

[0076] Partial support formwork system 2 is the support formwork system 2 for the wing plate 16 on the side of the railway box girder 1 near the pier 11.

[0077] In the specific implementation of this application, the prestressed ducts of the railway box girder 1 are distributed in the bottom plate and web plate. By setting the support formwork system 2 of the wing plate 16 near the pier 11 on the top surface of the pier 11, the amount of lateral movement work is reduced, the stability of the support formwork is improved, and the initial positioning of the railway box girder 1 in the longitudinal direction of the bridge is achieved without affecting the tensioning construction at both ends of the railway box girder 1.

[0078] Step S3 includes: when the remaining 1m of the lateral movement distance is about to be completed, gradually slow down the lateral movement speed and set a first stop on one end of the lateral slide 4 to prevent over-pulling during the lateral movement operation.

[0079] In the specific implementation of this application, the first stop is a wedge-shaped stop, and the overall lateral movement speed is controlled between 15 and 20 cm / min, that is, between 9 and 12 m / h.

[0080] A secondary positioning system is provided between the piers 11 corresponding to the railway box girder 1. The secondary positioning system includes a longitudinal slide 7, a longitudinal sliding shoe 8, a second lifting device 9, and a second temporary support.

[0081] The second temporary support is symmetrically distributed between the piers 11 along the transverse direction of the bridge and is used to support the longitudinal slide 7.

[0082] The longitudinal slide shoe 8 is slidably mounted on the corresponding longitudinal slide rail 7 along the bridge direction, and each longitudinal slide shoe 8 is fixedly equipped with multiple second lifting devices 9 along the bridge direction.

[0083] The longitudinal slide 7 is located below the transverse slide 4;

[0084] Construction methods also include:

[0085] Step S4, secondary positioning operation: After the railway box girder 1 is moved laterally into place, multiple second lifting devices 9 are activated to take over lifting the railway box girder 1 until the railway box girder 1 is disengaged from the transverse slide 4. Then, the longitudinal sliding shoe 8 is activated to drive the railway box girder 1 to move along the bridge direction until the railway box girder 1 is moved longitudinally into place.

[0086] In the specific implementation of this application, two second temporary supports are symmetrically distributed between piers 11 along the longitudinal direction of the bridge. Both second temporary supports are steel pipe column structures, and the longitudinal slide rails 7 are welded and fixed to the distribution beams at the top of the steel pipe column structures. The longitudinal slide rails 7 are manufactured in multiple segments, each segment being 17m long and 800mm high. Adjacent segments are connected by pins and screws to form a flat surface. The longitudinal slide shoe 8 is welded from I-beams, intermediate connecting steel plates, end plates, side plates, and top and bottom plates. The lower steel plate of the longitudinal slide shoe 8 forms a groove, in which an MGE sliding plate is embedded, and it is connected to the bottom plate of the transverse slide shoe 5 by bolts. In addition to reinforcement, the side plates of the longitudinal slide shoe 8 also serve a guiding and correction function. The two longitudinal slide shoes 8 are slidably engaged with the top of the corresponding longitudinal slide rail 7 through their respective lower grooves. Each longitudinal slide shoe 8 is provided with two second lifting devices 9 at intervals. The longitudinal sliding shoe 8 adopts a different power mechanism than the transverse sliding shoe 5. Specifically, each longitudinal sliding shoe 8 is equipped with a jack at both ends. Through the pushing and pulling action of the jacks at both ends, the top railway box girder 1 is moved in the longitudinal direction of the bridge, thereby realizing the secondary positioning operation. Furthermore, after the railway box girder 1 is moved into position laterally, multiple second lifting devices 9 are activated to take over the support of the railway box girder 1. Through the lateral limiting of the longitudinal slide rail 7, secondary deviation caused by the railway box girder 1 sliding on its own after being moved into position laterally can also be prevented.

[0087] Compared to the existing technology that uses blocks at both ends of the transverse slide shoe 5 for limiting, this technical solution can not only calibrate the railway box girder 1 in the longitudinal direction through the cooperation of the longitudinal slide 7, the longitudinal slide shoe 8 and the second lifting device 9, but also use the second lifting device 9 to take over supporting the railway box girder 1 and use the longitudinal slide 7 to limit the transverse direction of the railway box girder 1, thus avoiding the repeated setting of blocks.

[0088] Construction methods also include:

[0089] Step S5, Limiting Operation: Install the anti-fall beam stop block 12 and support bolts.

[0090] In the specific implementation of this application, after the secondary positioning operation of the railway box girder 1 is completed, the anti-falling beam blocks 12 on both sides of the bridge pier 11 in the transverse direction and the bottom support bolts of the railway box girder 1 are installed. Together with the railway box girder 1 that has been completed at both ends in the longitudinal direction, the limiting structure setting in the transverse and longitudinal directions of the railway box girder 1 to be lowered is completed. It can be used to prevent the railway box girder 1 from being deviated in the transverse and longitudinal directions during the subsequent beam lowering process.

[0091] Before the lateral movement construction is carried out, the bottom support of the railway box girder 1 is installed first, and the support bolts are temporarily placed into the bolt holes corresponding to the top pad stone 10 of the pier 11.

[0092] Step S6 includes: multiple second lifting devices 9 descending until multiple first lifting devices 6 take over supporting the railway box girder 1, multiple second lifting devices 9 continuing to descend for a first stroke and then stopping, multiple first lifting devices 6 descending until multiple second lifting devices 9 take over supporting the railway box girder 1, multiple first lifting devices 6 continuing to descend for a first stroke, repeating the cycle until the railway box girder 1 falls onto the bridge pier 11.

[0093] In the specific implementation of this application, after the first lifting device 6 takes over supporting the railway box girder 1 from the second lifting device 9, it continues to descend by 2cm and then stops. Similarly, after the first lifting device 6 takes over supporting the railway box girder 1 from the first lifting device 6, it continues to descend by 2cm and then stops. That is, the first stroke is 2cm. The first lifting device 6 and the second lifting device 9 are also equipped with displacement sensors to monitor the displacement of the first lifting device 6 and the second lifting device 9 in real time. The first lifting device 6 and the second lifting device 9 are also equipped with balance control valves to ensure the synchronization effect between the first lifting device 6 and between the second lifting device 9.

[0094] Compared to the existing technology that uses alternating beam lowering by setting up a lifting device and a pad on the top surface of the pier 11, this technical solution, while satisfying the basic secondary positioning function, turns the second lifting device 9 in the secondary positioning system into a beam lowering support structure, thus making full use of the second lifting device 9 and avoiding the duplication of lifting devices and pads, thereby simplifying the construction steps and improving efficiency.

[0095] In step S6, multiple second lifting devices 9 alternately descend on one side; multiple first lifting devices 6 alternately descend on one side.

[0096] In the specific implementation of this application, to prevent resonance of the railway box girder 1 during the lowering process and the resulting construction risks, a single-sided alternating lowering method is adopted. Specifically, first, along the longitudinal direction of the bridge, the railway box girder 1 is lowered by 2cm at the high mileage end, and then by 2cm at the low mileage end; then, along the transverse direction of the bridge, one side of the railway box girder 1 is lowered by 2cm, and then the other side is lowered by 2cm. During the single-sided alternating lowering, the longitudinal and transverse directions can be limited by the anti-falling block 12, the support bolts, and the completed railway box girder 1.

[0097] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A construction method for cast-in-place and transverse movement of a railway box girder side position adjacent to an existing high-speed railway, characterized in that, The construction method comprises: Step S1, construction system erection; Step S2, cast-in-place operation; Step S3, transverse movement operation; Step S6, beam falling operation; The construction system comprises a support formwork system and a transverse movement system; The transverse movement system comprises a transverse sliding shoe, a transverse sliding track and a first temporary support, the transverse sliding track is symmetrically distributed on both sides of the bottom of the railway box girder along the bridge longitudinal direction, the transverse sliding shoe is slidingly arranged on the transverse sliding track along the bridge transverse direction, the transverse sliding track extends into the bridge piers along the bridge transverse direction, and the first temporary support is used for supporting the transverse sliding track; The step S1 comprises: erecting part of the support formwork system on the top surface of the bridge pier, the bridge pier, the transverse movement system and the support formwork system jointly form a support system for supporting the cast-in-place operation of the railway box girder, and the pouring position of the railway box girder is initially positioned in the bridge longitudinal direction through the position of the cushion stone on the top surface of the bridge pier; The transverse movement system comprises a first jacking device, and a plurality of first jacking devices are fixedly arranged on each transverse sliding shoe along the bridge transverse direction; The bottom die of the support formwork system and the top of the plurality of first jacking devices jointly form a bottom die system of the railway box girder; The step S2 comprises: after the pouring of the railway box girder is completed, the inner die, the inner die support, the side die and the side die support are removed, the plurality of first jacking devices are started to jack up the railway box girder, and the bottom die and the bottom die support at the top of the transverse sliding track are removed; The bridge piers corresponding to the railway box girder are provided with a secondary positioning system, and the secondary positioning system comprises a longitudinal sliding track, a longitudinal sliding shoe, a second jacking device and a second temporary support; The second temporary support is symmetrically distributed between the bridge piers along the bridge transverse direction and is used for supporting the longitudinal sliding track; The longitudinal sliding shoe is slidingly arranged on the corresponding longitudinal sliding track along the bridge longitudinal direction, and a plurality of second jacking devices are fixedly arranged on each longitudinal sliding shoe along the bridge longitudinal direction; The longitudinal sliding track is located below the transverse sliding track; The construction method further comprises: Step S4, secondary positioning operation: after the railway box girder is transversely moved to the position, the plurality of second jacking devices are started to jack up the railway box girder until the railway box girder is separated from the transverse sliding track, the longitudinal sliding shoe is started to drive the railway box girder to move in the bridge longitudinal direction until the railway box girder is longitudinally moved to the position; The step S6 comprises: the plurality of second jacking devices are lowered until the plurality of first jacking devices jack up the railway box girder, the plurality of second jacking devices continue to be lowered for a first stroke and then stop, the plurality of first jacking devices are lowered until the plurality of second jacking devices jack up the railway box girder, the plurality of first jacking devices continue to be lowered for a first stroke, and the above steps are repeated until the railway box girder falls onto the bridge pier.

2. The construction method of the side position cast-in-place and transverse movement of the railway box girder adjacent to the existing high-speed railway according to claim 1, characterized in that, The support formwork system adopts a full-frame support of a disc buckle type, and the transverse movement system adopts a beam-column type support.

3. The construction method of the side position cast-in-place and transverse movement of a railway box girder adjacent to an existing high-speed railway according to claim 1, characterized in that, The part of the support formwork system is the support formwork system of the wing plate on the side of the railway box girder close to the bridge pier.

4. The railway box girder side cast-in-place and transverse movement construction method adjacent to an existing high-speed railway according to claim 1, characterized in that, The step S3 comprises: gradually slowing down the horizontal moving speed when the horizontal moving distance is the last 1m, and setting a first stopper on one end of the horizontal sliding way to prevent over-pulling of the horizontal moving operation.

5. The construction method of the side position cast-in-place and transverse movement of the railway box girder adjacent to the existing high-speed railway according to claim 1, characterized in that, The secondary positioning system is fixedly connected with the horizontal moving system.

6. The construction method of a cast-in-place and transverse moving of a railway box girder side position adjacent to an existing high-speed railway according to claim 1, characterized in that, The construction method further comprises: Step S5: limit operation: installing the beam stopper and the support bolt.

7. The construction method of a cast-in-place and transverse moving of a railway box girder side position adjacent to an existing high-speed railway according to claim 1, characterized in that, In step S6, the plurality of second jacking devices are alternately lowered on one side; and the plurality of first jacking devices are alternately lowered on one side.

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