A bridge widening structure and construction method

Abstract

This invention discloses a bridge widening structure and construction method. The structure includes an old bridge; new bridge pile foundations, cast on one side of the old bridge; new bridge piers, cast on the new bridge pile foundations; temporary clamps, installed between the new bridge piers and the old bridge; a new bridge cap beam and superstructure, cast on the new bridge piers, with the new bridge cap beam and superstructure spaced apart from the old bridge; multiple first tie beams, each installed on the new bridge pile foundations and new bridge piers, with the multiple first tie beams spaced apart; second tie beams, each corresponding to one of the first tie beams; and post-cast sections, with post-cast sections between the new bridge cap beam and superstructure and the old bridge, as well as between the first tie beams and their corresponding second tie beams. In this way, through the coordination of the temporary clamps, the first tie beams, the second tie beams, and the post-cast sections, most of the shrinkage, creep, and settlement of the new bridge occur during the settling period, thereby reducing the probability of cracks appearing near the interface between the new and old bridges.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, and more specifically, to a bridge widening structure and construction method. Background Technology

[0002] A bridge is generally a structure erected over rivers, lakes, or seas to allow vehicles and pedestrians to pass smoothly. To adapt to the rapidly developing modern transportation industry, the term "bridge" has also come to refer to structures built across mountains, challenging geological conditions, or to meet other transportation needs, making travel more convenient. A bridge typically consists of a superstructure, substructure, supports, and ancillary structures. The superstructure, also known as the bridge span structure, is the main structure that crosses obstacles; the substructure includes abutments, piers, and foundations; supports are force-transmitting devices installed at the points where the bridge span structure supports the piers or abutments; and ancillary structures include approach slabs, tapered slopes, revetments, and diversion works.

[0003] Currently, many urban bridges in my country need to be renovated because the width of the carriageway does not meet the usage requirements or the function of the bridge has changed. However, there are huge differences between the new bridge and the old bridge in terms of material age and settlement completion period. The shrinkage, creep and settlement of the old bridge have been basically completed, while the shrinkage, creep and settlement of the new bridge have only just begun after the construction is completed. This results in greater stress near the interface between the new and old bridges, which leads to defects such as cracks in the bridge deck, cap beams and tie beams. Summary of the Invention

[0004] The purpose of this invention is to provide a structure and construction method for widening bridges, which solves the technical problem in existing bridge widening methods that generate large stress near the interface between the old and new bridges, leading to cracks.

[0005] The above-mentioned technical objective of the present invention is achieved through the following technical solution:

[0006] This invention provides a bridge widening structure, comprising:

[0007] Old bridge;

[0008] The new bridge pile foundation is cast on one side of the old bridge;

[0009] New bridge piers, which are cast on top of the new bridge pile foundations;

[0010] A temporary clamp, which can be detachably installed between the new bridge pier and the old bridge;

[0011] The new bridge cap beam and superstructure are cast on the new bridge piers, and the new bridge cap beam and superstructure are spaced apart from the old bridge.

[0012] The first tie beam, there are multiple first tie beams, and the multiple first tie beams are respectively installed on the new bridge pile foundation and the new bridge pier, and the multiple first tie beams are arranged at intervals;

[0013] The number of second tie beams is equal to the number of first tie beams. Multiple second tie beams are installed on the old bridge. The second tie beams are arranged in a one-to-one correspondence with the first tie beams, and the second tie beams are spaced apart from the first tie beams.

[0014] The post-cast section is provided between the new bridge cap beam and superstructure and the old bridge, as well as between the first tie beam and the corresponding second tie beam.

[0015] Furthermore, the temporary clamp includes:

[0016] The sleeves are of two types, and the two sleeves are detachably installed on the new bridge pier and the old bridge, respectively.

[0017] A connector, which is mounted on the two sleeves.

[0018] Furthermore, the temporary clamp also includes:

[0019] An elastic element is installed on the inner sidewall of each of the sleeves.

[0020] Furthermore, the connecting component is an I-beam.

[0021] Furthermore, the sleeve is connected to the new bridge pier and the old bridge by bolts.

[0022] Furthermore, the elastic element is a rubber ring.

[0023] Furthermore, there are multiple temporary clamps, which are evenly distributed between the new bridge pier and the old bridge.

[0024] Furthermore, the temporary clamps are staggered with the first tie beam.

[0025] Furthermore, the new bridge pile foundation, the new bridge pier, and the post-cast section are all made of shrinkage-compensating concrete.

[0026] Furthermore, it also includes the following steps:

[0027] Step 1: Cast the new bridge pile foundation on one side of the old bridge pile foundation, then cast the new bridge pier on the top of the new bridge pile foundation, and then install temporary clamps between the new bridge pier and the old bridge pier.

[0028] Step 2: Cast the first tie beam on the side of the new bridge pile foundation closest to the old bridge and on the side of the new bridge piers closest to the old bridge. Install the second tie beam on the side of the old bridge closest to the new bridge pile foundation and reserve space for post-cast sections.

[0029] Step 3: Cast the new bridge cap beam and superstructure at the top of the new bridge piers, and reserve space for post-cast sections;

[0030] Step four: After letting it stand for six months, pour the post-pouring section, then remove the temporary clamps to complete the construction.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] The bridge widening structure provided by this invention includes an old bridge, new bridge pile foundations, new bridge piers, temporary clamps, a new bridge cap beam and superstructure, a first tie beam, a second tie beam, and a post-cast section. The new bridge pile foundations are cast on one side of the old bridge, and the new bridge piers are cast on one side of the old bridge. The temporary clamps are detachably installed between the new bridge piers and the old bridge. The new bridge cap beam and superstructure are cast on the new bridge piers, and are spaced apart from the old bridge. There are multiple first tie beams, which are respectively installed on the new bridge pile foundations and the new bridge piers, and are spaced apart from each other. The number of second tie beams is equal to the number of first tie beams, and the second tie beams correspond one-to-one with the first tie beams, and are spaced apart from each other. Post-cast sections are provided between the new bridge cap beam and superstructure and the old bridge, as well as between the first tie beams and the second tie beams.

[0033] With the above structure, when a bridge needs to be widened, the pile foundations for the new bridge are first poured on one side of the selected old bridge. Then, the new bridge piers are poured on the pile foundations. Temporary clamps are then installed between the new bridge piers and the old bridge piers. These temporary clamps connect the new bridge piers and the old bridge piers laterally into a portal frame structure, ensuring the vertical stability of the new bridge piers. After the temporary clamps are installed, the new bridge cap beams and superstructure are poured on the new bridge piers. This prevents the new bridge piers from becoming unstable due to eccentric loads after the construction of the new bridge cap beams and superstructure. Then, multiple first tie beams are poured on the new bridge pile foundations and new bridge piers, and multiple second tie beams are poured on the old bridge, so that the second tie beams correspond one-to-one with the first tie beams. A post-cast section is reserved between the first tie beams and their corresponding second tie beams. After the new bridge has been in a static setting period, the post-cast section is poured. Finally, the temporary clamps are removed. The static setting period for the new bridge ensures that most of the shrinkage, creep, and settlement of the new bridge occur during the static setting period, which reduces the probability of cracks appearing near the interface between the new bridge and the old bridge after the post-cast section is completed. Attached Figure Description

[0034] The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0035] Figure 1 This is a schematic diagram of the bridge widening structure provided in an embodiment of the present invention;

[0036] Figure 2 A schematic diagram of the structure of a temporary clamp provided in an embodiment of the present invention.

[0037] The attached diagram shows the markings and corresponding component names:

[0038] 1-Old bridge, 2-New bridge pile foundation, 3-New bridge pier, 4-Temporary clamp, 41-Sleeve, 42-Connector, 43-Elastic component, 5-New bridge cap beam and superstructure, 6-First tie beam, 7-Second tie beam, 8-Post-cast section. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention.

[0040] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly or indirectly attached to that other component. When a component is referred to as being "connected to" another component, it can be directly or indirectly connected to that other component.

[0041] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present 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. Therefore, they should not be construed as limitations on the present invention.

[0042] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. Example

[0043] This embodiment provides a bridge widening structure and construction method to solve the technical problem in existing bridge widening methods where large stresses occur near the interface between the old and new bridges, leading to cracks. The bridge widening structure includes the old bridge 1, new bridge pile foundations 2, new bridge piers 3, temporary clamps 4, new bridge cap beams and superstructure 5, a first tie beam 6, a second tie beam 7, and a post-cast section 8, wherein:

[0044] Old Bridge 1 is the bridge that needs to be widened. Old Bridge 1 includes the pile foundation of Old Bridge 1, the piers of Old Bridge 1, the cap beam of Old Bridge 1 and the superstructure, etc.

[0045] The new bridge pile foundation 2 is poured on one side of the old bridge 1. Specifically, the new bridge pile foundation 2 is poured on one side of the old bridge 1 pile foundation and is set at intervals with the old bridge 1 pile foundation.

[0046] The new bridge pier 3 is cast on top of the new bridge pile foundation 2, and the axis of the new bridge pier 3 and the axis of the new bridge pile foundation 2 are on the same straight line.

[0047] The temporary clamp 4 can be detachably installed between the new bridge pier 3 and the old bridge 1. Specifically, the temporary clamp 4 is installed between the new bridge pier 3 and the corresponding old bridge pier 1. The installation of the temporary clamp 4 ensures the stability of the new bridge structure during the construction phase.

[0048] The new bridge cap beam and superstructure 5 are cast on the new bridge pier 3, and the new bridge cap beam and superstructure 5 are set at intervals with the old bridge 1.

[0049] There are multiple first tie beams 6, which are installed on the new bridge pile foundation 2 and the new bridge pier column 3 respectively, and the multiple first tie beams 6 are arranged at intervals.

[0050] The number of second tie beams 7 is equal to the number of first tie beams 6. Multiple second tie beams 7 are installed on the old bridge 1. The second tie beams 7 and the first tie beams 6 are set in a one-to-one correspondence and are spaced apart. Optionally, the second tie beams 7 are connected to the pile foundation of the old bridge 1 and the second tie beams 7 are connected to the pier of the old bridge 1 by means of rebar installation. The setting of the first tie beams 6 and the second tie beams 7 facilitates the connection of the new bridge pile foundation 2 to the pile foundation of the old bridge 1 and the new bridge pier 3 to the pier of the old bridge 1 after the settling period.

[0051] Post-cast sections 8 are provided between the new bridge cap beam and superstructure 5 and the old bridge 1, as well as between the first tie beam 6 and the corresponding second tie beam 7. In this way, by setting up post-cast sections 8, after the settling period, the post-cast sections 8 are poured to connect the new bridge pile foundation 2 with the old bridge pile foundation 1, the new bridge pier 3 with the old bridge pier 1, and the new bridge cap beam and superstructure 5 with the old bridge cap beam and superstructure 1. At this time, shrinkage, creep and settlement have been completed. After the post-cast sections 8 are poured, only slight relative displacement will occur, thus avoiding cracks at the joint.

[0052] With the above structure, when a bridge needs to be widened, the pile foundation of the new bridge is first poured on one side of the selected old bridge 1. Then, the new bridge pier 3 is poured on the new bridge pile foundation 2. Temporary clamps 4 are then installed between the new bridge pier 3 and the old bridge 1. The temporary clamps 4 connect the new bridge pier 3 and the pier of the old bridge 1 laterally into a portal frame structure, ensuring the vertical stability of the new bridge pier 3. After the temporary clamps 4 are installed, the new bridge cap beam and superstructure 5 are poured on the new bridge pier 3 to prevent the new bridge pier 3 from becoming unstable due to eccentric loads after the new bridge cap beam and superstructure 5 are poured. Then, multiple first tie beams 6 are poured on the new bridge pile foundation 2 and the new bridge pier 3, and multiple second tie beams 7 are poured on the old bridge 1, so that the second tie beams 7 correspond one-to-one with the first tie beams 6. A post-cast section 8 is reserved between the first tie beams 6 and the corresponding second tie beams 7. After the new bridge has been in a static period, the post-cast section 8 is poured. Finally, the temporary clamps 4 can be removed. The static period of the new bridge ensures that most of the shrinkage, creep and settlement of the new bridge occur during the static period, which reduces the probability of cracks appearing near the interface between the new bridge and the old bridge 1 after the post-cast section 8 is completed.

[0053] An optional implementation of this embodiment is as follows: The temporary clamp 4 includes a sleeve 41 and a connector 42, wherein:

[0054] There are two sleeves 41. The two sleeves 41 can be detachably installed on the new bridge pier 3 and the old bridge 1 respectively. Specifically, one of the two sleeves 41 is installed on the new bridge pier 3, and the other sleeve 41 is installed on the old bridge pier 1. The two sleeves 41 are located on the same horizontal plane.

[0055] The connector 42 is installed on the two sleeves 41. The two sleeves 41 are connected together by the connector 42 to prevent the new bridge pier 3 from becoming unstable due to eccentric load during later construction.

[0056] Optionally, connector 42 can be made of I-beam. I-beams have particularly strong bending resistance and are not prone to bending. Moreover, I-beams are lighter than ordinary steel profiles but have better load-bearing capacity. At the same time, I-beams are cheaper, saving costs.

[0057] Optionally, the sleeve 41 is connected to the new bridge pier 3 and the old bridge 1 by bolts, which facilitates the installation and removal of the sleeve 41.

[0058] An optional implementation of this embodiment is as follows: the temporary clamp 4 further includes an elastic element 43, wherein:

[0059] Each sleeve 41 has an elastic element 43 installed on its inner wall. With the setting of the elastic element 43, the internal force generated when the new bridge pier 3 undergoes contraction deformation and settlement displacement in the vertical direction will be released through the elastic deformation of the elastic element 43, thus preventing the internal force of the deformation of the new bridge pier 3 from being transmitted to the old bridge 1.

[0060] Optionally, the elastic element 43 is a rubber ring.

[0061] An optional implementation of this embodiment is as follows: there are multiple temporary clamps 4, which are evenly distributed between the new bridge pier 3 and the old bridge 1. The setting of multiple temporary clamps 4 further ensures the stability of the new bridge pier 3.

[0062] Optionally, multiple temporary clamps 4 are staggered with the first tie beam 6.

[0063] An optional implementation of this embodiment is as follows: The new bridge pile foundation 2, the new bridge pier 3, and the post-cast section 8 are all made of shrinkage-compensating concrete, also known as micro-expansion concrete, which can offset the stress and deformation caused by concrete shrinkage through its own expansion. The new bridge pile foundation 2 and the new bridge pier 3 have asynchronous shrinkage cycles compared to the old bridge pile foundation 1 and the old bridge 1 pier. After the old bridge pile foundation 1 and the old bridge 1 pier stabilize, the new bridge pile foundation 2 and the new bridge pier 3 are still shrinking, meaning that the new bridge pile foundation 2 and the new bridge pier 3 may become shorter vertically. However, by using shrinkage-compensating concrete, the new bridge pile foundation 2 and the new bridge pier 3 can offset the deformation through their own expansion, thus reducing the probability of the new bridge pile foundation 2 and the new bridge pier 3 becoming shorter vertically, thereby reducing the probability of cracks forming at the joint.

[0064] Before the post-cast section 8 was poured, the new bridge pier 3, the first tie beam 6, the second tie beam 7, the new bridge cap beam and the superstructure 5 had been left to stand for a period of time, and their settlement had been basically completed. The post-cast section 8 uses shrinkage-compensating concrete, which can make the post-cast section 8 press tightly against both sides to avoid cracks caused by its own shrinkage. In addition, the preload can reduce the chance of cracking due to residual settlement and other reasons.

[0065] An optional implementation of this embodiment is as follows: The construction method for the bridge widening structure includes the following steps:

[0066] Step 1: Pour the new bridge pile foundation 2 on one side of the old bridge pile foundation 1, then pour the new bridge pier 3 on the top of the new bridge pile foundation 2, and then install temporary clamps 4 between the new bridge pier 3 and the old bridge pier 1.

[0067] Step 2: Cast the first tie beam 6 on the side of the new bridge pile foundation 2 closest to the old bridge 1 and the side of the new bridge pier 3 closest to the old bridge 1. Cast the second tie beam 7 on the side of the old bridge 1 closest to the new bridge pile foundation 2, and reserve the post-cast section 8.

[0068] Step 3: Cast the new bridge cap beam and superstructure at the top of the new bridge pier 3, and reserve the post-cast section 8;

[0069] Step four: After letting it stand for six months, pour the post-pouring section 8, then remove the temporary clamps 4 to complete the construction.

[0070] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A bridge widening structure, characterized in that, include: Old Bridge (1); New bridge pile foundation (2), the new bridge pile foundation (2) is cast on one side of the old bridge (1); New bridge pier (3), the new bridge pier (3) is cast on the top of the new bridge pile foundation (2); Temporary clamp (4), which can be detachably installed between the new bridge pier (3) and the old bridge (1); The new bridge cap beam and superstructure (5) are cast on the new bridge pier (3), and the new bridge cap beam and superstructure (5) are spaced apart from the old bridge (1); The first tie beam (6) is a plurality of the first tie beams (6), and the plurality of the first tie beams (6) are respectively installed on the new bridge pile foundation (2) and the new bridge pier (3), and the plurality of the first tie beams (6) are spaced apart; The number of second tie beams (7) is equal to the number of first tie beams (6). Multiple second tie beams (7) are installed on the old bridge (1). The second tie beams (7) and the first tie beams (6) are arranged in a one-to-one correspondence, and the second tie beams (7) and the first tie beams (6) are spaced apart. The post-cast section (8) is provided between the new bridge cap beam and the superstructure (5) and the old bridge (1), as well as between the first tie beam (6) and the corresponding second tie beam (7).

2. The bridge widening structure according to claim 1, characterized in that, The temporary clamp (4) includes: Sleeve (41), there are two sleeves (41), and the two sleeves (41) are respectively detachably installed on the new bridge pier (3) and the old bridge (1); A connector (42) is mounted on the two sleeves (41).

3. The bridge widening structure according to claim 2, characterized in that, The temporary clamp (4) also includes: Elastic element (43) is installed on the inner sidewall of each of the sleeves (41).

4. The bridge widening structure according to claim 2, characterized in that, The connector (42) is an I-beam.

5. The bridge widening structure according to claim 4, characterized in that, The sleeve (41) is connected to the new bridge pier (3) and the old bridge (1) by bolts.

6. The bridge widening structure according to claim 3, characterized in that, The elastic element (43) is a rubber ring.

7. The bridge widening structure according to claim 2, characterized in that, The number of temporary clamps (4) is multiple, and the multiple temporary clamps (4) are evenly distributed between the new bridge pier (3) and the old bridge (1).

8. The bridge widening structure according to claim 7, characterized in that, The temporary clamps (4) are staggered with the first tie beam (6).

9. The bridge widening structure according to claim 1, characterized in that, The new bridge pile foundation (2), the new bridge pier (3), and the post-cast section (8) are all made of shrinkage-compensating concrete.

10. A construction method for a bridge widening structure comprising any one of claims 1-9, characterized in that, Includes the following steps: Step 1: Cast a new bridge pile foundation (2) on one side of the old bridge (1) pile foundation, then cast a new bridge pier (3) on the top of the new bridge pile foundation (2), and then install a temporary clamp (4) between the new bridge pier (3) and the old bridge (1) pier. Step 2: Cast the first tie beam (6) on the side of the new bridge pile foundation (2) close to the old bridge (1) and the side of the new bridge pier (3) close to the old bridge (1). Install the second tie beam (7) on the side of the old bridge (1) close to the new bridge pile foundation (2) and reserve the post-cast section (8). Step 3: Cast the new bridge cap beam and superstructure at the top of the new bridge pier (3), and reserve the post-cast section (8). Step 4: After standing for six months, pour the post-pouring section (8), then remove the temporary clamps (4) to complete the construction.

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