A method for constructing a new viaduct on an existing bridge

Abstract

This application relates to a method for constructing a new viaduct on an existing bridge. The existing bridge includes at least two concrete beams distributed along the transverse direction of the bridge, and an existing lower structure arranged below the concrete beams. The method comprises the following steps: Select two adjacent concrete beams, determine a cut part of the lower structure at one end of the existing lower structure below them that are close to each other, and construct a new part of the lower structure at one end that are far from each other; Transversely move the concrete beams towards the direction where the new part of the lower structure is located, so that one end of the concrete beams falls on the new part of the lower structure; Demolish the cut part of the lower structure to form a construction space; Construct a new lower structure of the viaduct in the construction space; Erect a beam body on the new lower structure of the viaduct. This application not only realizes the purpose of adding lines and improving capacity and efficiency for the existing bridge, but also reduces the construction cost, shortens the construction time, and increases the economic and social benefits of the project.

Description

Technical Field

[0001] This application relates to the technical field of bridge construction, and particularly to a method for building a new viaduct on an existing bridge. Background Art

[0002] With the continuous strengthening of the connection between regional economies and the continuous improvement of local road networks, some roads are difficult to meet the growing traffic demands. Under the background of building a transportation power, in order to improve the infrastructure network, enhance the transportation service guarantee ability, and improve the travel quality, it is necessary to expand and transform busy lines, improve the line transportation capacity, improve the regional road network, and achieve smooth internal and external connections.

[0003] In related technologies, for projects where the new and old lines overlap, they are usually directly demolished and rebuilt. This not only has high costs and cumbersome processes, making it difficult to quickly carry out high-quality and high-progress operations, but also has a long construction time. Summary of the Invention

[0004] The embodiments of this application provide a method for building a new viaduct on an existing bridge, which not only realizes the purpose of adding lines and improving capacity and efficiency to the existing bridge, but also reduces the construction cost, shortens the construction time, and increases the economic and social benefits of the project.

[0005] The embodiments of this application provide a method for building a new viaduct on an existing bridge. The existing bridge includes at least two concrete beams distributed along the transverse direction of the bridge, and an existing lower structure arranged below the concrete beams; the method includes the following steps:

[0006] Select two adjacent concrete beams, determine the cut part of the lower structure on one end where the existing lower structures below them are close to each other, and construct the new part of the lower structure on one end where they are far from each other;

[0007] Translate the concrete beam in the direction of the new part of the lower structure, so that one end of the concrete beam falls on the new part of the lower structure;

[0008] Demolish the cut part of the lower structure to form a construction space;

[0009] Construct the new lower structure of the viaduct in the construction space;

[0010] Erect a beam body on the new lower structure of the viaduct.

[0011] In some embodiments, the existing bridge includes at least two rows of concrete beams distributed along the transverse direction of the bridge, and each row of concrete beams includes a plurality of concrete beams distributed along the longitudinal direction of the bridge;

[0012] Before translating the concrete beam in the direction of the new part of the lower structure, the method further includes: releasing the constraint between the concrete beams.

[0013] In some embodiments, releasing the constraint between the concrete beams includes releasing the constraint of the expansion joint.

[0014] In some embodiments, the transverse movement of the concrete beam in the direction where the new part of the lower structure is located includes the following steps:

[0015] Arrange vertical jacks at the top of the piers of the existing lower structure, jack up the concrete beam upward, and remove multiple bearings distributed along the transverse direction of the bridge;

[0016] Arrange two walking jacks at each bearing position, and use the two walking jacks to alternately lift to drive the transverse movement of the concrete beam;

[0017] After the transverse movement is in place, set the bearings of the concrete beam after transverse movement.

[0018] In some embodiments, demolishing the cut part of the lower structure includes the following steps:

[0019] Use a diamond wire saw to cut the cut part of the lower structure and lift it off in blocks;

[0020] Chisel the concrete at the incision to expose the steel bars and connect them to the newly made steel bar mesh, and pour concrete to seal the steel bars.

[0021] In some embodiments, the newly built lower structure of the viaduct includes bored piles, cushions, pile caps, piers and crossbeams;

[0022] Construct the newly built lower structure of the viaduct in the construction space, including the following steps:

[0023] Drive steel casing and lower the inner support of the cofferdam;

[0024] Install the cofferdam with the inner support of the cofferdam as the guide and excavate the soil inside the cofferdam layer by layer;

[0025] Construct bored piles, cushions, pile caps and piers, demolish the cofferdam, and construct crossbeams at the top of the piers to complete the construction of the newly built lower structure of the viaduct.

[0026] In some embodiments, constructing the crossbeam at the top of the pier includes the following steps:

[0027] Construct the pile cap embedded parts on the pile cap;

[0028] Install steel pipe columns on the pile cap embedded parts;

[0029] Set drop blocks at the top of the steel pipe columns;

[0030] Support the truss on the drop blocks;

[0031] Install bent frames on the truss;

[0032] Install formwork on the bent cap to obtain the bent cap support;

[0033] Pour the bent cap on the bent cap support to bear on the pier column.

[0034] In some embodiments, the steel pipe columns are connected by a connecting system.

[0035] In some embodiments, the beam body includes a steel box girder and a bridge deck pavement;

[0036] Erect the beam body on the lower structure of the newly built viaduct, including the following steps:

[0037] Lift and install the steel box girder on the bent cap, and construct the bridge deck pavement on the steel box girder.

[0038] In some embodiments, lifting and installing the steel box girder on the bent cap includes the following steps:

[0039] Lay the gantry crane track on the horizontally shifted concrete beam and install the gantry crane;

[0040] Install the steel beam assembly support on the horizontally shifted concrete beam;

[0041] Use the gantry crane to assemble the steel box girder on the steel beam assembly support so that the steel box girder bears on the bent cap.

[0042] The beneficial effects brought by the technical solution provided in this application include:

[0043] The method for building a new viaduct on an existing bridge in the embodiments of this application, by demolishing a part of the existing lower structure instead of demolishing the existing bridge, and at the same time by horizontally shifting the concrete beam of the existing bridge, expanding the space on the line to build a new viaduct, adding lines to improve the traffic capacity, realizing the expansion and transformation of the existing bridge, improving the highway transportation capacity, and minimizing the impact on the operation of the existing line and the occupation of the waterway as much as possible; further giving play to the advantages of smooth internal and external connection of the line, continuously pursuing traffic efficiency and road network connectivity, improving the travel environment, and significantly optimizing the social and economic benefits brought by transportation. Moreover, the embodiments of this application cause very little damage to the existing structure; avoiding the planning and demolition work required for the new line, greatly reducing the project cost and shortening the construction time. Brief Description of the Drawings

[0044] In order to more clearly illustrate the technical solutions in the embodiments of this application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0045] Figure 1This is the plan view of the pier top for the transverse movement of the concrete beam provided by the embodiment of the present application;

[0046] Figure 2 This is the cross-sectional view along the transverse bridge direction of the pier top before the transverse movement of the concrete beam provided by the embodiment of the present application;

[0047] Figure 3 This is the cross-sectional view along the transverse bridge direction of the pier top after the transverse movement of the concrete beam provided by the embodiment of the present application;

[0048] Figure 4 This is the schematic diagram of the construction space formed after the transverse movement provided by the embodiment of the present application;

[0049] Figure 5 This is the cross-sectional view along the transverse bridge direction at the pier of the lower structure construction of the newly built viaduct provided by the embodiment of the present application;

[0050] Figure 6 This is the cross-sectional view along the transverse bridge direction of the capping beam construction provided by the embodiment of the present application;

[0051] Figure 7 This is the cross-sectional view along the transverse bridge direction of the steel box girder construction provided by the embodiment of the present application.

[0052] In the figure: 1. Concrete beam; 2. Existing lower structure; 20. Cut part of the lower structure; 21. Newly built part of the lower structure; 3. Construction space; 4. Lower structure of the newly built viaduct; 40. Bored pile; 41. Cap; 42. Embedded parts of the cap; 43. Pier column; 5. Beam body; 50. Capping beam; 51. Steel box girder; 52. Steel beam assembly support; 6. Vertical jack; 7. Walking jack; 8. Capping beam support; 80. Steel pipe column; 81. Truss; 82. Bent frame; 83. Formwork; 84. Bracing system; 9. Gantry crane; 10. Support of the concrete beam after transverse movement. Detailed implementation manners

[0053] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0054] See Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7As shown in the figure, an embodiment of the present application provides a method for constructing a new viaduct on an existing bridge. The existing bridge includes at least two concrete beams 1 distributed along the transverse direction of the bridge, and an existing lower structure 2 arranged below the concrete beams 1. The adjacent concrete beams 1 in the transverse direction of the bridge are usually not connected to form different lanes. The existing lower structure 2 usually includes pile foundations, pile caps, pier bodies, etc. The method includes the following steps:

[0055] 101: Refer to Figure 2 , Figure 3 and Figure 4 As shown, in the transverse direction of the bridge, select two adjacent concrete beams 1 as the objects to be transformed. Determine the lower structure cutting part 20 on one end of the existing lower structures 2 that are close to each other below these two adjacent concrete beams 1, draw lines and make marks, and construct the lower structure new part 21 on the end that is far from each other. Obviously, the selected objects to be transformed have a moving space in the transverse direction of the bridge, and after the two objects to be transformed are laterally moved outward, that is, away from each other, the vacated space is sufficient to construct the lower structure 4 of the new viaduct.

[0056] 102: Refer to Figure 3 and Figure 4 As shown, laterally move the concrete beam 1 in the direction where the lower structure new part 21 is located until there is a construction space for the new viaduct between the two concrete beams 1, and make one end of the concrete beam 1 fall on the lower structure new part 21.

[0057] 103: Refer to Figure 4 As shown, demolish the lower structure cutting part 20 to form a construction space 3.

[0058] 104: Refer to Figure 5 , Figure 6 and Figure 7 As shown, construct the lower structure 4 of the new viaduct in the construction space 3.

[0059] 105: Refer to Figure 6 and Figure 7 As shown, erect a beam body 5 on the lower structure 4 of the new viaduct.

[0060] The method for building a new viaduct on an existing bridge according to the embodiments of the present application demolishes a part of the existing substructure instead of demolishing the existing bridge. At the same time, by horizontally moving the concrete beams of the existing bridge, space is expanded on the line to build a new viaduct, and additional lines are added to improve the traffic capacity, realizing the capacity expansion and renovation of the existing bridge, improving the highway transportation capacity, and minimizing the impact on the operation of the existing line and the occupation of the waterway as much as possible; further leveraging the advantages of smooth internal and external connections of the line, continuously pursuing traffic efficiency and road network connectivity, improving the travel environment, and significantly optimizing the social and economic benefits brought by transportation. Moreover, the embodiments of the present application cause very little damage to the existing structure; avoid the planning and demolition work required for the new line, greatly reduce the project cost, and shorten the construction time.

[0061] Generally speaking, the existing bridge includes at least two columns of concrete beams 1 distributed along the transverse direction of the bridge. Each column of concrete beams 1 includes a plurality of concrete beams 1 distributed along the longitudinal direction of the bridge. The adjacent two concrete beams 1 in each column are connected. Therefore, before horizontally moving the concrete beam 1 in the direction of the new part 21 of the substructure, the method further includes: releasing the constraint between the concrete beams 1.

[0062] Specifically, releasing the constraint between the concrete beams 1 includes releasing the constraint of the expansion joint.

[0063] In the above step 102, horizontally moving the concrete beam 1 in the direction of the new part 21 of the substructure includes the following steps:

[0064] 201: Arrange vertical jacks 6 on the top of the piers of the existing substructure 2, jack up the concrete beam 1 upward, and remove a plurality of bearings distributed along the transverse direction of the bridge.

[0065] 202: Arrange two walking jacks 7 at each bearing position, and use the two walking jacks 7 to alternately lift to drive the concrete beam 1 to move horizontally.

[0066] Specifically, after a single walking jack 7 vertically lifts, its horizontal oil cylinder lifts to realize the horizontal movement of the concrete beam 1, and the oil cylinder of the other walking jack 7 returns oil, and alternately lifts to realize the continuous running function.

[0067] 203: After the horizontal movement is in place, set the bearing 10 of the horizontally moved concrete beam, and lower the concrete beam 1.

[0068] In the above step 103, demolishing the cut part 20 of the substructure includes the following steps:

[0069] 301: After marking on the existing substructure 2, use a diamond wire saw to cut the cut part 20 of the substructure along the mark, and lift it off in blocks.

[0070] 302: Roughen the cut concrete to expose the steel bars and connect them to the newly fabricated steel mesh, then pour concrete to enclose the steel bars.

[0071] When cutting the lower structure cutting part 20, use a diamond wire saw for low-vibration dynamic cutting to minimize the impact on the existing structure.

[0072] See Figure 6 As shown, the lower structure 4 of the newly built viaduct includes bored piles 40, cushion, pile cap 41, pier columns 43 and capping beams 50; in the above step 104, when constructing the lower structure 4 of the newly built viaduct in the construction space 3, the following steps are included:

[0073] 401: See Figure 5 As shown, set up a crane on the horizontally moved concrete beam 1, and use the crane to insert the steel casing and lower the internal support of the cofferdam.

[0074] 402: Install the cofferdam with the internal support of the cofferdam as the guide, and excavate the soil inside the cofferdam layer by layer.

[0075] 403: Construct the bored piles 40, cushion, pile cap 41 and pier columns 43, remove the cofferdam, and construct the capping beam 50 on the top of the pier column 43 to complete the construction of the lower structure 4 of the newly built viaduct.

[0076] Among them, see Figure 6 As shown, the capping beam support 8 includes pile cap embedded parts 42, steel pipe columns 80, drop blocks, trusses 81, bent frames 82 and formwork 83 for installation. In the above step 403, when constructing the capping beam 50 on the top of the pier column 43, the following steps are included:

[0077] 600: Construct the pile cap embedded parts 42 on the pile cap 41. The pile cap embedded parts 42 can be constructed after the construction of the pile cap 41 and before the construction of the pier column 43.

[0078] 601: Use lifting equipment to lift the steel pipe columns 80 and install the steel pipe columns 80 on the pile cap embedded parts 42. The steel pipe columns 80 are connected by a connecting system 84, and the steel pipe columns 80 and the pier column 43 are connected by an attached wall connection.

[0079] 602: Set drop blocks on the top of the steel pipe columns 80 and finely adjust the elevation.

[0080] 603: Support the truss 81 on the drop blocks.

[0081] 604: Install the bent frame 82 on the truss 81.

[0082] 605: Install the formwork 83 on the bent frame 82 to obtain the capping beam support 8.

[0083] 606: Pour the capping beam 50 on the capping beam support 8 to bear on the pier column 43.

[0084] The truss 81 is fixed by welding angle steel to the steel pipe column 80. When demolishing, the angle steel is cut, and the truss 81, bent frame 82 and formwork 83 are lowered integrally by using the dropping blocks.

[0085] See Figure 7 As shown, the beam body 5 includes a steel box girder 51 and a bridge deck pavement. In the above step 105, erecting the beam body 5 on the lower structure 4 of the newly built viaduct includes the following steps:

[0086] 501: Hoist the steel box girder 51 on the capping beam 50.

[0087] 502: Construct the bridge deck pavement on the steel box girder 51.

[0088] In the above step 501, hoisting the steel box girder 51 on the capping beam 50 includes the following steps:

[0089] 701: Lay the gantry crane track on the horizontally shifted concrete beam 1 and install the gantry crane 9.

[0090] 702: Install the steel beam assembly support 52 on the horizontally shifted concrete beam 1.

[0091] 703: Use the gantry crane 9 to assemble the steel box girder 51 on the steel beam assembly support 52 so that the steel box girder 51 is borne on the capping beam 50, and finally construct the bridge deck pavement.

[0092] In the description of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application. Unless otherwise clearly specified and defined, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0093] It should be noted that in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0094] The above are only specific embodiments of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features claimed herein.

Claims

1. A method for constructing a new viaduct on an existing bridge, the existing bridge comprising at least two concrete beams (1) distributed along the transverse direction of the bridge, and an existing substructure (2) disposed below the concrete beams (1); characterized in that, It includes the following steps: Select two adjacent concrete beams (1), determine a lower structure cutting part (20) at one end of the existing lower structure (2) below them that are close to each other, and construct a new lower structure part (21) at the end that is far from each other; Translate the concrete beam (1) in the direction of the new lower structure part (21) so that one end of the concrete beam (1) falls on the new lower structure part (21); Demolish the lower structure cutting part (20) to form a construction space (3); Construct a new viaduct lower structure (4) in the construction space (3); Erect a beam body (5) on the new viaduct lower structure (4).

2. The method for constructing a new viaduct on an existing bridge according to claim 1, characterized in that: The existing bridge includes at least two rows of concrete beams (1) distributed along the transverse direction of the bridge, and each row of concrete beams (1) includes a plurality of concrete beams (1) distributed along the longitudinal direction of the bridge; Before translating the concrete beam (1) in the direction of the new lower structure part (21), the method further includes: releasing the constraints between the concrete beams (1).

3. The method for constructing a new viaduct on an existing bridge according to claim 2, characterized in that: Releasing the constraints between the concrete beams (1) includes releasing the constraints of the expansion joints.

4. The method for building a new viaduct on an existing bridge as claimed in claim 1, characterized in that Translating the concrete beam (1) in the direction of the new lower structure part (21) includes the following steps: Arrange vertical jacks (6) at the pier top of the existing lower structure (2), jack up the concrete beam (1) upward, and remove a plurality of bearings distributed along the transverse direction of the bridge; Arrange two walking jacks (7) at each bearing position, and use the two walking jacks (7) to alternately lift to drive the concrete beam (1) to translate; After translation in place, set the bearing of the concrete beam after translation (10).

5. The method for constructing a new viaduct on an existing bridge according to claim 1, characterized in that, Demolishing the lower structure cutting part (20) includes the following steps: Cut the lower structure cutting part (20) with a diamond wire saw and lift it off in blocks; Chisel the concrete at the cut to expose the steel bars and connect them to the newly made steel bar mesh, and pour concrete to seal the steel bars.

6. The method for constructing a new viaduct on an existing bridge according to claim 1, characterized in that, The new viaduct lower structure (4) includes bored piles (40), cushions, pile caps (41), pier columns (43) and cross beams (50); Constructing the new viaduct lower structure (4) in the construction space (3) includes the following steps: Insert steel casing and lower the inner support of the cofferdam; Install the cofferdam with the inner support of the cofferdam as a guide and excavate the soil inside the cofferdam layer by layer; Construct bored piles (40), cushions, pile caps (41) and pier columns (43), remove the cofferdam, and construct a cross beam (50) on the top of the pier column (43) to complete the construction of the new viaduct lower structure (4).

7. The method for newly building a viaduct on an existing bridge according to claim 6, wherein, Constructing the cross beam (50) on the top of the pier column (43) includes the following steps: Construct pile cap embedded parts (42) on the pile cap (41); Install steel pipe columns (80) on the pile cap embedded parts (42); Set unloading blocks on the top of the steel pipe columns (80); Support the truss (81) on the unloading blocks; Install a bent frame (82) on the truss (81); Install a formwork (83) on the bent frame (82) to obtain a cross beam support (8); Pour the cross beam (50) on the cross beam support (8) to bear on the pier column (43).

8. The method for constructing a new viaduct on an existing bridge as claimed in claim 7, wherein: The steel pipe columns (80) are connected by a connecting system (84).

9. The method for constructing a new viaduct on an existing bridge according to claim 6, characterized in that, The beam body (5) includes a steel box girder (51) and a bridge deck pavement; Erecting the beam body (5) on the lower structure (4) of the newly built viaduct includes the following steps: Hoisting the steel box girder (51) on the cap beam (50) and constructing the bridge deck pavement on the steel box girder (51).

10. The method for constructing a new viaduct on an existing bridge as claimed in claim 9, characterized in that, Hoisting the steel box girder (51) on the cap beam (50) includes the following steps: Laying a gantry crane track on the concrete beam (1) of the existing bridge and installing a gantry crane (9); Installing a steel beam assembly support (52) on the horizontally moved concrete beam (1); Using the gantry crane (9) to assemble the steel box girder (51) on the steel beam assembly support (52) so that the steel box girder (51) bears on the cap beam (50).

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