Construction method of old bridge widening and bridge structure

Abstract

This invention relates to a construction method and bridge structure for widening an existing bridge, comprising the following steps: extending and casting an inner extension foundation outwards in the direction of bridge width on the side of the existing bridge abutment to be widened; extending and casting an inner extension tower column outwards in the direction of bridge width on the existing bridge tower; casting an outer extension foundation and outer extension tower column outside the inner extension foundation according to the dimensions and specifications of the existing bridge abutment and tower column; constructing an upper and lower extension crossbeam between the inner and outer extension tower columns; and constructing the extended span bridge on the lower extension crossbeam, thus completing the construction. The beneficial effects of this invention are: by extending and casting an inner extension foundation outwards in the direction of bridge width on the existing bridge abutment, and extending and casting an inner extension tower column outwards in the direction of bridge width on the existing bridge tower column, the width of the foundation and tower columns between the extended bridge and the existing bridge is reduced, effectively improving the utilization rate between the new and old bridges.

Description

Technical Field

[0001] This invention relates to the field of bridge widening technology, and in particular to a construction method and bridge structure for widening an old bridge. Background Technology

[0002] With the continuous improvement of our bridge construction standards and the increasing transportation demands of the people, the pace of bridge construction has accelerated, and our bridges have spread to every corner of the country. However, as time goes by, the bridges that were built in the past are gradually becoming old and worn out.

[0003] For older bridges with structural damage, the common solution is demolition and reconstruction. While this method effectively addresses the problem, not all damage is present on older bridges. Therefore, besides demolition and reconstruction, building a new bridge with a similar structure next to the old one has quickly gained acceptance due to its advantages in terms of economy, aesthetics, and ease of construction. For example, the old Yuehu Bridge in Wuhan opened to traffic in 1998, and its sister bridge, the new one, opened in 2018, both utilizing the method of building a structurally similar bridge next to the old one.

[0004] H-shaped bridge towers are widely used in cable-stayed or suspension bridge structures due to their simple construction, clear structural force transmission, and small tower inclination angle, which facilitates construction. When the old bridge towers are H-shaped, the arrangement of the new bridge towers becomes a controlling factor. If towers of the same size are built, the foundation scale and cost can theoretically be similar to those of the old bridge. However, even if the towers of the adjacent new bridge and the old bridge are placed close together, the space between the tower columns and the columns of the two independent bridge towers will still occupy space.

[0005] Therefore, it is essential to provide a construction method and bridge structure for widening an old bridge to solve the aforementioned technical problems. Summary of the Invention

[0006] This invention provides a construction method and bridge structure for widening an old bridge, which can solve the problem in related technologies where, when building a new bridge next to an old bridge, even if the bridge towers of the adjacent new bridge and the old bridge are close together, the space between their tower columns and the tower columns of the two independent bridge towers will still be occupied.

[0007] On the one hand, embodiments of the present invention provide a construction method for widening an old bridge.

[0008] Includes the following steps:

[0009] On the side of the old bridge abutment that needs to be widened, extend outwards in the direction of bridge width to create an extended inner abutment.

[0010] On the old bridge tower, extend and cast outwards in the direction of bridge width to create an extended inner tower;

[0011] According to the dimensions and specifications of the old bridge abutment and old bridge tower, the extended outer abutment and extended outer tower were poured on the outside of the extended inner abutment.

[0012] Construct the upper and lower extension beams between the inner and outer tower columns.

[0013] The construction of the bridge spans was carried out on the lower extension beam, that is, the construction was completed.

[0014] Furthermore, the step of "extending and casting an extended inner pier on the side of the old bridge abutment that needs to be widened, in the direction of bridge width" specifically includes the following steps:

[0015] On the side of the old bridge abutment that needs to be widened, pour the inner extension pile foundation for the inner abutment.

[0016] The formwork for the inner extension pile foundation is erected on the inner extension pile foundation, connecting the formwork of the inner extension pile foundation with the inner extension pile foundation and the old bridge abutment. Concrete is then poured into the formwork of the inner extension pile foundation to complete the construction of the inner extension pile foundation.

[0017] Furthermore, it also includes:

[0018] The concrete on the surface of the old bridge abutment was removed, and steel bars were inserted into the old bridge abutment after the concrete was removed. At the same time, steel bars were spliced ​​on the inner extension pile foundation, and the steel bars inserted into the old bridge abutment were connected with the spliced ​​steel bars on the inner extension pile foundation. The formwork for the inner extension abutment was erected outside the steel bars.

[0019] Furthermore, the step of "extending and casting an extended inner tower column outwards in the direction of bridge width on the old bridge tower column" specifically includes the following steps:

[0020] The template for the extended inner tower column is erected on the side of the old bridge tower column, and the bottom of the template for the extended inner tower column is fixed to the extended inner bearing platform.

[0021] Furthermore, it also includes:

[0022] The concrete on the surface of the old bridge tower was removed, and steel bars were inserted into the old bridge tower after the concrete was removed. At the same time, steel bars were erected on the inner pier of the extension, and the steel bars inserted in the old bridge tower were connected with the steel bars erected on the inner pier of the extension. The formwork for the inner pier of the extension was erected outside the steel bars.

[0023] Furthermore, the step of "casting the extended outer pier and the extended outer tower on the outside of the extended inner pier according to the dimensions and specifications of the old bridge abutment and the old bridge tower" specifically includes the following steps:

[0024] The outer extension pile foundation is poured on the outer side of the inner extension cap;

[0025] Reinforcing bars were erected on the outer extension pile foundation, and the formwork for the outer extension pile was erected outside the reinforcing bars according to the size and specifications of the old bridge abutment.

[0026] Concrete was poured inside the formwork of the extended outer foundation to complete the construction of the extended outer foundation.

[0027] According to the dimensions and specifications of the old bridge tower, steel bars were erected on the outer pier of the extension, and the formwork for the outer tower was erected outside the steel bars.

[0028] Concrete was poured inside the formwork of the extended outer tower column to complete the construction of the extended outer tower column.

[0029] Furthermore, the step of "constructing the upper and lower extension beams between the inner and outer extension tower columns" specifically includes the following steps:

[0030] Above the inner and outer tower columns of the extended bridge, formwork for the extended crossbeams is erected according to the height of the crossbeams on the old bridge, and concrete is poured.

[0031] Below the inner and outer tower columns of the extension, the formwork for the extension beam is erected according to the height of the old bridge's under-beam, and concrete is poured.

[0032] Furthermore, it also includes:

[0033] Above the inner and outer tower columns of the extension, prestressed connectors are pre-embedded, and the formwork for the extension beam is erected outside the upper prestressed connectors.

[0034] Prestressed connectors are pre-embedded below the inner and outer tower columns of the extension, and the formwork for the lower extension beam is erected outside the lower prestressed connectors.

[0035] Furthermore, the step of "constructing the extended span bridge on the lower extension beam" specifically includes the following steps:

[0036] Reinforcing bars and formwork for the extended span bridge are erected on the lower extension beam, and concrete is poured inside the formwork of the extended span bridge.

[0037] On the one hand, a bridge structure is provided, including:

[0038] Old bridge abutment;

[0039] The old bridge towers are located on the foundations of the old bridge.

[0040] The upper and lower crossbeams of the old bridge are located between the two aforementioned old bridge towers;

[0041] The old bridge is a split-span bridge, which is located on the crossbeam under the old bridge;

[0042] An extended inner pier is provided on one side of the old bridge pier.

[0043] An extended inner tower column is located on one side of the old bridge tower column and situated on the extended inner bearing platform;

[0044] An extended outer support platform is provided on one side of the extended inner support platform;

[0045] An extended outer tower column is provided on the extended outer support platform;

[0046] The upper and lower extension beams are located between the inner and outer extension tower columns.

[0047] The extended span bridge is located on the lower extended crossbeam.

[0048] The beneficial effects of the technical solution provided by this invention include:

[0049] By extending and casting an extended inner pier in the direction of bridge width from the old bridge abutment, and extending and casting an extended inner tower in the direction of bridge width from the old bridge tower, the width of the abutment and tower between the extended bridge and the old bridge is reduced. This effectively improves the utilization rate between the new and old bridges and avoids the problem that even if the towers of the new and old bridges are built close together, the space between their towers and the towers of the two independent bridge towers will still occupy space. Attached Figure Description

[0050] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0051] Figure 1 This is a schematic diagram of a bridge structure for widening an old bridge according to the present invention;

[0052] Figure 2 This is a cross-sectional schematic diagram of the extended inner tower column in a bridge structure for widening an old bridge according to the present invention.

[0053] Figure 3 This is a cross-sectional schematic diagram of the inner extension pile foundation in a bridge structure for widening an old bridge according to the present invention.

[0054] Figure 4 This is a cross-sectional schematic diagram of the outer extension pile foundation in a bridge structure for widening an old bridge according to the present invention.

[0055] In the diagram: 1. Old bridge abutment; 2. Old bridge tower; 3. Extended inner abutment; 4. Extended inner tower; 5. Extended outer abutment; 6. Extended outer tower; 7. Upper extended crossbeam; 8. Lower extended crossbeam; 9. Extended split bridge; 10. Old bridge upper crossbeam; 11. Old bridge lower crossbeam; 12. Old bridge split bridge; 13. Upper prestressed connector; 14. Lower prestressed connector; 15. Inner extended pile foundation; 16. Outer extended pile foundation. Detailed Implementation

[0056] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0057] See Figures 1 to 4 As shown in the figure, this embodiment of the invention provides a construction method for widening an old bridge, including the following steps:

[0058] On the side of the old bridge abutment 1 that needs to be widened, extend outward in the direction of bridge width and cast out the extended inner abutment 3.

[0059] On the old bridge tower 2, extend outwards in the direction of bridge width to form the extended inner tower 4;

[0060] According to the dimensions and specifications of the old bridge abutment 1 and the old bridge tower 2, the extended outer abutment 5 and the extended outer tower 6 are poured on the outside of the extended inner abutment 3.

[0061] Construct the upper extension beam 7 and the lower extension beam 8 between the inner tower column 4 and the outer tower column 6.

[0062] Construction of the extended span bridge 9 on the lower extension beam 8 is completed.

[0063] In this embodiment, the bottom of the extended inner tower column 4 is fixed on the extended inner support platform 3.

[0064] In some embodiments, the step of "extending and casting an extended inner pier 3 outward in the direction of bridge width on the side of the old bridge abutment 1 that needs to be widened" specifically includes the following steps:

[0065] On the side of the old bridge abutment 1 that needs to be widened, pour the inner extension pile foundation 15 of the inner extension abutment 3.

[0066] The formwork for the inner extension pile foundation 3 is erected on the inner extension pile foundation 15, so that the formwork for the inner extension pile foundation 3 is connected to the inner extension pile foundation 15 and the old bridge abutment 1. Concrete is poured into the formwork for the inner extension pile foundation 3 to complete the construction of the inner extension pile foundation 3.

[0067] In some embodiments, it also includes:

[0068] The concrete on the surface of the old bridge abutment 1 is removed, and steel bars are inserted into the old bridge abutment 1 after the concrete is removed. At the same time, steel bars are lapped on the inner extension pile foundation 15, and the steel bars inserted into the old bridge abutment 1 are connected with the lapped steel bars on the inner extension pile foundation 15. The formwork for the inner extension abutment 3 is erected outside the steel bars.

[0069] In some embodiments, the step of "extending and casting an extended inner tower 4 outward in the direction of bridge width on the old bridge tower 2" specifically includes the following steps:

[0070] A template for the extended inner tower 4 is erected on the side of the old bridge tower 2, and the bottom of the template for the extended inner tower 4 is fixed on the extended inner pier 3.

[0071] In some embodiments, it also includes:

[0072] The concrete on the surface of the old bridge tower 2 is removed, and steel bars are inserted into the old bridge tower 2 after the concrete is removed. At the same time, steel bars are erected on the inner extension platform 3, and the steel bars inserted into the old bridge tower 2 are connected with the steel bars erected on the inner extension platform 3. The formwork for the inner extension tower 4 is erected outside the steel bars.

[0073] In some embodiments, the step of "casting the extended outer pier 5 and the extended outer tower 6 on the outer side of the extended inner pier 3 according to the size specifications of the old bridge abutment 1 and the old bridge tower 2" specifically includes the following steps:

[0074] The outer extension pile foundation 16 is poured on the outer side of the inner extension pile cap 3;

[0075] Reinforcing bars are erected on the outer extension pile foundation 16, and the formwork for the outer extension pile 5 is erected outside the reinforcing bars according to the size and specifications of the old bridge pile cap 1.

[0076] Concrete was poured inside the formwork of the extended outer pier 5 to complete the construction of the extended outer pier 5.

[0077] According to the dimensions and specifications of the old bridge tower column 2, steel bars are erected on the outer extension pier 5, and the formwork for the outer extension tower column 6 is erected outside the steel bars.

[0078] Concrete was poured into the formwork of the extended outer tower column 6 to complete the construction of the extended outer tower column 6.

[0079] In this embodiment, the template for the extended outer pier 5 is erected outside the reinforcing steel according to the size and specifications of the old bridge pier 1. Specifically, the template for the extended outer pier 5 is erected with the same specifications as the old bridge pier 1 in terms of length, width and height.

[0080] In addition, formwork for the extended outer tower 6 was erected with the same length, width and height as the old bridge tower 2.

[0081] In some embodiments, the step of "constructing the upper extension beam 7 and the lower extension beam 8 between the inner extension tower column 4 and the outer extension tower column 6" specifically includes the following steps:

[0082] Above the inner tower column 4 and the outer tower column 6 of the extension, the formwork for the extension beam 7 is erected according to the height of the old bridge's upper beam 10, and concrete is poured.

[0083] Below the inner tower column 4 and the outer tower column 6 of the extension, the formwork for the lower extension beam 8 is erected according to the height of the old bridge's lower beam 11, and concrete is poured.

[0084] In some embodiments, it also includes:

[0085] Above the inner tower column 4 and the outer tower column 6, prestressed connectors 13 are pre-embedded, and the formwork for the upper extension beam 7 is erected outside the upper prestressed connectors 13.

[0086] Below the inner tower column 4 and the outer tower column 6, prestressed connectors 14 are pre-embedded, and the formwork for the lower extension beam 8 is erected outside the lower prestressed connectors 14.

[0087] In some embodiments, the step of "constructing the extended span bridge 9 on the lower extended crossbeam 8" specifically includes the following steps:

[0088] Reinforcing bars and formwork for the extended span bridge 9 are erected on the lower extension beam 8, and concrete is poured inside the formwork of the extended span bridge 9.

[0089] On the one hand, a bridge structure is provided, including:

[0090] Old bridge abutment 1;

[0091] The old bridge tower 2 is located on the old bridge abutment 1;

[0092] The upper crossbeam 10 and the lower crossbeam 11 of the old bridge are located between the two old bridge tower columns 2;

[0093] The old bridge span 12 is located on the crossbeam 11 under the old bridge.

[0094] Extend the inner pier 3, which is located on one side of the old bridge pier 1;

[0095] Extend the inner tower column 4, which is located on one side of the old bridge tower column 2 and on the extended inner pier 3;

[0096] An extended outer support 5 is provided on one side of the extended inner support 3;

[0097] An extended outer tower column 6 is provided on the extended outer support platform 5;

[0098] The upper extension beam 7 and the lower extension beam 8 are located between the inner extension tower column 4 and the outer extension tower column 6.

[0099] The extended span bridge 9 is located on the lower extended crossbeam 8.

[0100] The beneficial effects of this invention are as follows:

[0101] By extending and casting an extended inner pier in the direction of bridge width from the old bridge abutment, and extending and casting an extended inner tower in the direction of bridge width from the old bridge tower, the width of the abutment and tower between the extended bridge and the old bridge is reduced. This effectively improves the utilization rate between the new and old bridges and avoids the problem that even if the towers of the new and old bridges are built close together, the space between their towers and the towers of the two independent bridge towers will still occupy space.

[0102] In the description of this invention, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Unless otherwise expressly specified and limited, the terms "set," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0103] It should be noted that, in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the term "comprising," or any other variation thereof, is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0104] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features of the invention herein.

Claims

1. A construction method for widening an old bridge suitable for H-shaped bridge towers, characterized in that, It comprises the following steps: On the side of the old bridge bearing platform (1) that needs to be widened, extend and pour the inner side bearing platform (3) outward in the direction of the bridge width; On the old bridge tower column (2), extend and pour the inner side tower column (4) outward in the direction of the bridge width; According to the size specifications of the old bridge bearing platform (1) and the old bridge tower column (2), pour the outer side bearing platform (5) and the outer side tower column (6) outside the inner side bearing platform (3); Construct the upper and lower extension cross beams (7) and (8) between the inner side tower column (4) and the outer side tower column (6); Construct the extension section bridge (9) on the lower extension cross beam (8), that is, complete the construction; The step of "on the old bridge tower column (2), extend and pour the inner side tower column (4) outward in the direction of the bridge width" specifically comprises the following steps: Set up the formwork of the inner side tower column (4) on the side of the old bridge tower column (2), and fix the bottom of the formwork of the inner side tower column (4) on the inner side bearing platform (3); The step of "construct the upper and lower extension cross beams (7) and (8) between the inner side tower column (4) and the outer side tower column (6)" specifically comprises the following steps: According to the height of the upper cross beam (10) of the old bridge, set up the formwork of the upper extension cross beam (7) above the inner side tower column (4) and the outer side tower column (6), and pour concrete; According to the height of the lower cross beam (11) of the old bridge, set up the formwork of the lower extension cross beam (8) below the inner side tower column (4) and the outer side tower column (6), and pour concrete; It further comprises: Embed the upper prestressed connecting piece (13) above the inner side tower column (4) and the outer side tower column (6), and set up the formwork of the upper extension cross beam (7) outside the upper prestressed connecting piece (13); Embed the lower prestressed connecting piece (14) below the inner side tower column (4) and the outer side tower column (6), and set up the formwork of the lower extension cross beam (8) outside the lower prestressed connecting piece (14).

2. A construction method for widening an old bridge suitable for H-shaped bridge towers as claimed in claim 1, characterized in that, The step of "on the side of the old bridge bearing platform (1) that needs to be widened, extend and pour the inner side bearing platform (3) outward in the direction of the bridge width" specifically comprises the following steps: Pour the inner side pile foundation (15) of the inner side bearing platform (3) on the side of the old bridge bearing platform (1) that needs to be widened; Set up the formwork of the inner side bearing platform (3) on the inner side pile foundation (15), connect the formwork of the inner side bearing platform (3) with the inner side pile foundation (15) and the old bridge bearing platform (1), and pour concrete in the formwork of the inner side bearing platform (3) to complete the construction of the inner side bearing platform (3).

3. A method of widening an existing bridge suitable for H-bridge piers as claimed in claim 2, wherein, It further comprises: Remove the concrete on the surface of the old bridge bearing platform (1), and embed steel bars in the old bridge bearing platform (1) after removing the concrete, meanwhile, connect the embedded steel bars in the old bridge bearing platform (1) with the steel bars on the inner side pile foundation (15), and set up the formwork of the inner side bearing platform (3) outside the steel bars.

4. The method for widening an existing bridge suitable for H-shaped bridge towers according to claim 1, wherein It further comprises: The concrete on the surface of the old bridge tower column (2) is chiseled off, and the steel bars are implanted in the old bridge tower column (2) after the concrete is chiseled off, meanwhile, the steel bars are arranged on the expanded inner side bearing platform (3), and the steel bars implanted in the old bridge tower column (2) are connected with the steel bars arranged on the expanded inner side bearing platform (3), and the formwork of the expanded inner side tower column (4) is arranged outside the steel bars.

5. The method for widening an existing bridge suitable for H- shaped bridge towers according to claim 1, characterized in that, The step of "pouring the expanded outer side bearing platform (5) and the expanded outer side tower column (6) on the outside of the expanded inner side bearing platform (3) according to the size specifications of the old bridge bearing platform (1) and the old bridge tower column (2)" specifically comprises the following steps: The outer side expanded pile foundation (16) is poured on the outside of the expanded inner side bearing platform (3); The steel bars are arranged on the outer side expanded pile foundation (16), and the formwork of the expanded outer side bearing platform (5) is arranged outside the steel bars according to the size specifications of the old bridge bearing platform (1); The concrete is poured in the formwork of the expanded outer side bearing platform (5), and the construction of the expanded outer side bearing platform (5) is completed; The steel bars are arranged on the expanded outer side bearing platform (5) according to the size specifications of the old bridge tower column (2), and the formwork of the expanded outer side tower column (6) is arranged outside the steel bars; The concrete is poured in the formwork of the expanded outer side tower column (6), and the construction of the expanded outer side tower column (6) is completed.

6. A method of widening an existing bridge suitable for H-bridge pylon as claimed in claim 1, wherein, The step of "constructing the expanded divided bridge (9) on the lower expanded cross beam (8)" specifically comprises the following steps: The steel bars and the formwork of the expanded divided bridge (9) are arranged on the lower expanded cross beam (8), and the concrete is poured in the formwork of the expanded divided bridge (9).

7. A bridge structure suitable for H-shaped pylon, which is constructed by the construction method for widening the old bridge suitable for H-shaped pylon according to any one of claims 1 to 6, characterized in that, It comprises: An old bridge bearing platform (1); An old bridge tower column (2) arranged on the old bridge bearing platform (1); Old bridge upper cross beams (10) and old bridge lower cross beams (11) arranged between two old bridge tower columns (2); An old bridge divided bridge (12) arranged on the old bridge lower cross beam (11); An expanded inner side bearing platform (3) arranged on one side of the old bridge bearing platform (1); An expanded inner side tower column (4) arranged on one side of the old bridge tower column (2) and located on the expanded inner side bearing platform (3); An expanded outer side bearing platform (5) arranged on one side of the expanded inner side bearing platform (3); An expanded outer side tower column (6) arranged on the expanded outer side bearing platform (5); Upper expanded cross beams (7) and lower expanded cross beams (8) arranged between the expanded inner side tower column (4) and the expanded outer side tower column (6); and an expanded divided bridge (9) arranged on the lower expanded cross beam (8).

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