Existing long-span bridge structure underpinning and reinforcement systems and bridge pile reinforcement methods

Abstract

This invention relates to the field of bridge reinforcement technology, and discloses an existing long-span bridge structure underpinning and reinforcement system and bridge pile reinforcement method, including an upper beam, and original piers, reinforcement piles, abutment beams, and temporary support piles located on the underside of the upper beam; at least two original piers are spaced apart along the width direction of the upper beam, and the original piers are vertically supported by the upper beam; multiple reinforcement piles are vertically spaced apart from the upper beam, and the multiple reinforcement piles and at least two original piers are spaced apart along the width direction of the upper beam; the abutment beam is parallel to the width direction of the upper beam, and the abutment beam is fixedly connected to the top of the multiple reinforcement piles, the abutment beam surrounds the outside of the original piers, and an anchoring structure is provided between the abutment beam and the original piers; multiple temporary support piles are spaced apart along the width direction of the upper beam, and the temporary support piles are spaced apart from the original piers along the length direction of the upper beam, and the upper part of the temporary support piles is provided with an underpinning support for detachably installing steel supports, jacks, and steel support beams.

Description

Technical Field

[0001] This invention relates to the field of bridge reinforcement technology, and in particular to an existing long-span bridge structure underpinning and reinforcement system and a bridge pile reinforcement method. Background Technology

[0002] Currently, highway bridges typically adopt beam bridge structures, which mainly consist of superstructure beams, piers, and abutments. Beam bridges have advantages such as simple structure, convenient construction, and good economy, and have been widely used in highway and railway transportation engineering.

[0003] In reality, geological changes or overloading of bridges can lead to structural subsidence, necessitating timely reinforcement of bridge foundations. For example, Chinese invention patent CN105002835B, published on January 11, 2017, discloses a method for bridge underpass replacement under cut-and-cover tunnels. The specific steps are as follows: 1. Under the bridge, Bailey bridges are used to support the transverse steel supports, with jacks installed between the steel supports and the Bailey bridge supports; 2. Support piles are poured, and the jacks under the steel supports are adjusted to transfer the load from the Bailey bridge supports to the support piles; 3. A new pier cap is installed between the piers, and replacement piles are installed below the new pier cap. Jacks are installed between the new pier cap and the replacement piles, and the settlement of the piers is adjusted by raising and lowering the jacks; bearings or steel pads are used to replace the aforementioned jacks.

[0004] The existing method for bridge reinforcement involves setting up new pier caps between the original piers and supporting the new pier caps with replacement piles. However, each replacement pile provides independent support to the new pier cap, which may lead to an imbalance in the stress on the new pier cap. Furthermore, the replacement piles and the original piers cannot form an integral foundation structure, making it difficult to ensure the stability and reliability of the bridge reinforcement effect. Summary of the Invention

[0005] The technical problem to be solved by this invention is that each replacement pile is an independent support for the new pier, which may lead to an imbalance in the stress on the new pier. The replacement pile and the original pier cannot form an integral foundation structure, making it difficult to ensure the stability and reliability of the bridge reinforcement effect.

[0006] To address the aforementioned technical problems, this invention provides a technical solution for an existing long-span bridge structure underpinning and reinforcement system:

[0007] The existing long-span bridge structure underpinning and reinforcement system includes an upper beam, original piers, reinforcement piles, abutment beams, and temporary support piles. The original piers, reinforcement piles, abutment beams, and temporary support piles are all located on the underside of the upper beam.

[0008] The original bridge piers are provided in at least two, and the at least two original bridge piers are distributed at intervals along the width direction of the upper beam, and the at least two original bridge piers are respectively supported by the upper beam.

[0009] The reinforcement piles are provided in multiple quantities, and the multiple reinforcement piles are arranged vertically at intervals with the upper beam body, and the multiple reinforcement piles and at least two original bridge piers are distributed at intervals along the width direction of the upper beam body;

[0010] The pier cap beam extends parallel to the width direction of the upper beam body. The pier cap beam is fixedly connected to the top of the multiple reinforcing piles, and the pier cap beam surrounds the outside of the original bridge pier. An anchoring structure is provided between the pier cap beam and the original bridge pier.

[0011] The temporary support piles are provided in multiples, and the multiple temporary support piles are distributed at intervals along the width direction of the upper beam. The temporary support piles and the original bridge piers are arranged at intervals along the length direction of the upper beam. The upper part of the temporary support piles is provided with a replacement support part, which is used to detachably install steel supports, jacks and steel support beams.

[0012] Furthermore, the anchoring structure includes a shear groove formed on the original pier, the shear groove being arranged in a spiral or circular shape around the outer wall of the original pier, and the interior of the pier cap beam having an interlocking part that cooperates with the shear groove.

[0013] Furthermore, the original bridge pier is provided with multiple rebar holes, which extend along the radial direction of the original bridge pier and are spaced apart in the circumferential direction of the original bridge pier.

[0014] The anchoring structure also includes multiple anchor bars, which are inserted and fixed in the anchor holes. The ends of the anchor bars protrude from the outside of the original pier and are fixedly connected to the pier cap beam.

[0015] Furthermore, the shear groove is staggered from the structural reinforcement of the original pier, the anchor bar is staggered from the structural reinforcement of the original pier, and the anchor hole is filled with anchoring adhesive for fixing and connecting the anchor bar.

[0016] Furthermore, the reinforcing piles and the original piers are arranged alternately along the width direction of the upper beam, and the reinforcing piles and the original piers are evenly spaced along the width direction of the upper beam.

[0017] Furthermore, the reinforcing pile and the temporary support pile are both cast-in-place pile structures. The structural reinforcement of the reinforcing pile and the structural reinforcement of the temporary support pile are both segmented steel cages, and the segmented steel cages are connected by straight threaded sleeves after being hoisted into place.

[0018] To address the aforementioned technical problems, this invention also provides a technical solution for strengthening bridge piles in existing long-span bridge structure underpinning and reinforcement systems:

[0019] The bridge pile reinforcement method used in the aforementioned existing long-span bridge structure underpinning and reinforcement system includes the following steps:

[0020] S1. Install multiple reinforcing piles and multiple temporary support piles on the outside of the original bridge piers;

[0021] S2. Install steel supports, jacks and steel support beams in sequence on the support portion of the temporary support pile. The steel support beams are located on the lower side of the upper beam and extend along the width direction of the upper beam.

[0022] S3. The jacks are synchronously controlled according to the set pre-jacking force to support the upper beam body through the steel support beam;

[0023] S4. Construct a pier cap beam between the original pier and the reinforcement pile. The pier cap beam surrounds the outside of the original pier and is fixedly connected to the top of the reinforcement pile.

[0024] S5. Remove the steel supports, jacks and steel support beams on the replacement support.

[0025] Furthermore, in step S1, when constructing the reinforcing piles and the temporary support piles, the control is carried out according to the indicators of pile bottom elevation and rock penetration depth; when drilling the cast-in-place piles, mud is used to form mud wall protection, the sediment in the hole is cleaned and the sediment thickness is controlled to be no more than 50mm, the hole position deviation of the drilled pile is no less than 100mm, the inclination is no more than 2.5‰, and steel casing is used for protection when pouring the pile foundation concrete;

[0026] The structural reinforcement bars of the reinforcing piles and the structural reinforcement bars of the temporary support piles are all processed into steel cages in sections. During hoisting, the sectioned steel cages are connected in sequence. The main bars of the sectioned steel cages are connected with straight threaded sleeves. After the steel cages are in place in the hole, they are fixed and limited to prevent them from floating or tilting, and to meet the minimum protective layer thickness requirements of reinforced concrete.

[0027] Furthermore, in step S4, the foundation pit of the pier is excavated and the original pier is monitored in real time; according to the design requirements, shear grooves are opened on the outer wall of the original pier, the depth of the shear grooves is controlled to be any size from 30mm to 60mm, and the shear grooves are staggered from the structural steel bars of the original pier.

[0028] Before installing the rebar, non-destructive testing equipment is used to locate the structural rebar, and the rebar hole positions are checked and marked to ensure that the rebar hole positions are staggered from the original structural rebar of the pier. Drilling is carried out according to the markings, and the hole depth is controlled to be the same as the embedment depth of the anchor bar. The rebar hole is then cleaned.

[0029] Inject anchoring adhesive into the anchoring hole, gradually injecting the adhesive from the bottom of the hole outwards, controlling the injection depth to two-thirds of the hole depth; clean the surface dirt of the anchoring bar, and rotate the anchoring bar into the bottom of the anchoring hole, avoiding disturbing the anchoring bar before the anchoring adhesive cures.

[0030] Furthermore, in step S4, the structural steel bars for the foundation beam are tied and connected to the anchor bars in the foundation pit; the concrete surface of the original pier is cleaned and roughened by chiseling or sandblasting.

[0031] The concrete surface of the original bridge pier is coated with an interface adhesive. After the first layer of interface adhesive penetrates into the concrete and reaches a gelled state, a second layer of interface adhesive is applied as a bonding layer. While the interface adhesive is in its applicable period, the concrete of the pier cap beam is poured in one go, and curing work is carried out after the pouring is completed.

[0032] Compared with existing technologies, the present invention provides a replacement and reinforcement system for existing long-span bridge structures and a method for reinforcing bridge piles. The system employs a design consisting of an upper beam, original piers, reinforcing piles, abutment beams, and temporary support piles. All components—original piers, reinforcing piles, abutment beams, and temporary support piles—are located on the underside of the upper beam. At least two original piers are spaced apart along the width of the upper beam, primarily supporting it before construction. Multiple reinforcing piles are provided, vertically spaced from the upper beam, and spaced along the width of the upper beam along with the at least two original piers. By using multiple reinforcing piles, the number and density of bridge foundation piles are increased, thereby ensuring the overall structural reliability of the bridge pile foundation.

[0033] The foundation beam extends parallel to the width of the upper beam and is fixedly connected to the tops of multiple reinforcing piles. The foundation beam surrounds the original piers. Located below the upper beam and fixedly connected to the reinforcing piles and the original piers, the foundation beam has an anchoring structure between it and the original piers. This anchoring structure ensures the bonding strength between the foundation beam and the original piers, avoiding weak points in the force transmission path, thus forming an integral foundation structure. Multiple reinforcing piles and multiple original piers can evenly transfer vertical support forces from different locations to the foundation beam, which then effectively supports the upper beam through the portion of the original piers located above the foundation beam.

[0034] In addition, multiple temporary support piles are provided, spaced apart along the width of the upper beam and spaced apart from the original piers along the length of the upper beam. During the reinforcement construction, steel supports, jacks, and steel support beams are installed in the underpinning support section. These temporary support piles, steel supports, jacks, and steel support beams provide underpinning support for the upper beam, ensuring its structural stability during the underpinning process. Simultaneously, during the excavation and pouring of the reinforcement piles and the abutment beam, they prevent instability caused by ground disturbance to the original piers and upper beam. This underpinning reinforcement system, consisting of the original piers, reinforcement piles, and abutment beams, forms an integral foundation structure, avoiding independent support of the new abutment by the existing underpinning piles. This improves the stress balance of the abutment beam, thereby ensuring the stability and reliability of the bridge reinforcement effect. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the existing long-span bridge structure underpinning and reinforcement system in step S1 in an embodiment of the present invention;

[0036] Figure 2 This is a schematic diagram of the existing long-span bridge structure underpinning and reinforcement system in step S2 in an embodiment of the present invention;

[0037] Figure 3 This is a schematic diagram of the existing long-span bridge structure underpinning and reinforcement system in step S4 of this embodiment of the invention;

[0038] Figure 4 This is a cross-sectional schematic diagram of the completed long-span bridge structure underpinning and reinforcement system in an embodiment of the present invention.

[0039] Figure 5 yes Figure 3 A schematic diagram of the cross-section of the existing long-span bridge structure underpinning and reinforcement system at point AA;

[0040] Figure 6 This is a top view of the original bridge pier, abutment beam, and other components in an embodiment of the present invention;

[0041] Figure 7 This is a front view schematic diagram of the shear groove and anchor bars of the original bridge pier in an embodiment of the present invention;

[0042] In the diagram: 1-Upper beam, 2-Original pier, 20-Anchorage structure, 201-Shear groove, 202-Anchorage bar, 3-Reinforcing pile, 4-Pile cap beam, 41-Structural reinforcement, 42-Concrete cushion, 5-Temporary support pile, 50-Underpinning support, 51-Steel support, 52-Jack, 53-Steel support beam. Detailed Implementation

[0043] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0044] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise" used to indicate orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and are not intended to 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 this invention.

[0045] 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.

[0046] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0047] like Figures 1 to 7 As shown, an embodiment of the present invention provides a replacement and reinforcement system for an existing long-span bridge structure, comprising an upper beam 1, original piers 2, reinforcement piles 3, abutment beams 4, and temporary support piles 5. The original piers 2, reinforcement piles 3, abutment beams 4, and temporary support piles 5 are all located on the lower side of the upper beam 1. At least two original piers 2 are provided, and the at least two original piers 2 are distributed at intervals along the width direction of the upper beam 1, and the at least two original piers 2 are respectively vertically supported and cooperated with the upper beam 1.

[0048] Multiple reinforcing piles 3 are provided, and the multiple reinforcing piles 3 are arranged vertically at intervals with the upper beam 1. The multiple reinforcing piles 3 and at least two original piers 2 are distributed at intervals along the width direction of the upper beam 1. The pier cap beam 4 extends parallel to the width direction of the upper beam 1. The pier cap beam 4 is fixedly connected to the top of the multiple reinforcing piles 3. The pier cap beam 4 surrounds the outside of the original piers 2. An anchoring structure 20 is provided between the pier cap beam 4 and the original piers 2.

[0049] There are multiple temporary support piles 5, which are distributed at intervals along the width direction of the upper beam 1, and the temporary support piles 5 and the original piers 2 are arranged at intervals along the length direction of the upper beam 1. The upper part of the temporary support piles 5 is provided with a replacement support part 50, which is used to detachably install steel supports 51, jacks 52 and steel support beams 53.

[0050] The existing long-span bridge structure underpinning and reinforcement system adopts a design consisting of an upper beam 1, original piers 2, reinforcement piles 3, abutment beams 4, and temporary support piles 5. The original piers 2, reinforcement piles 3, abutment beams 4, and temporary support piles 5 are all located on the underside of the upper beam 1. At least two original piers 2 are spaced apart along the width of the upper beam 1, primarily supporting the upper beam 1 before construction. Multiple reinforcement piles 3 are provided, vertically spaced from the upper beam 1, and spaced apart from the at least two original piers 2 along the width of the upper beam 1. By setting multiple reinforcement piles 3, the number and density of the bridge foundation piles are increased, thus ensuring the overall structural reliability of the bridge pile foundation.

[0051] The pier cap beam 4 extends parallel to the width of the upper beam 1 and is fixedly connected to the tops of multiple reinforcing piles 3. The pier cap beam 4 surrounds the exterior of the original piers 2. Located below the upper beam 1, the pier cap beam 4 is fixedly connected to the reinforcing piles 3 and the original piers 2. An anchorage structure 20 is provided between the pier cap beam 4 and the original piers 2 to ensure the bonding strength between them, avoiding weak points in the force transmission path. This allows the original piers 2, reinforcing piles 3, and pier cap beam 4 to form an integral foundation structure. The multiple reinforcing piles 3 and the multiple original piers 2 can evenly transfer the vertical support force from different locations to the pier cap beam 4, which then effectively supports the upper beam 1 through the portion of the original piers 2 located above the pier cap beam 4.

[0052] In addition, multiple temporary support piles 5 are provided, spaced apart along the width of the upper beam 1, and spaced apart from the original piers 2 along the length of the upper beam 1. During the reinforcement construction, steel supports 51, jacks 52, and steel support beams 53 are installed on the underpinning support section 50. The temporary support piles 5, steel supports 51, jacks 52, and steel support beams 53 provide underpinning support for the upper beam 1, ensuring the structural stability of the upper beam 1 during the underpinning process. At the same time, during the excavation and pouring of the reinforcement piles 3 and the abutment beam 4, it prevents the original piers 2 and the upper beam 1 from becoming unstable due to ground disturbance. The original piers 2, reinforcement piles 3, and abutment beam 4 of this underpinning reinforcement system form an integral foundation structure, avoiding independent support of the new abutment by the existing underpinning piles, improving the stress balance of the abutment beam 4, and thus ensuring the stability and reliability of the bridge reinforcement effect.

[0053] In this embodiment, the anchoring structure 20 includes a shear groove 201 formed on the original pier 2, such as... Figure 7 As shown, the shear groove 201 is arranged in a spiral or ring shape around the outer wall of the original pier 2, and the interior of the pier cap beam 4 is provided with an interlocking part that cooperates with the shear groove 201. Specifically, the interlocking part is a spiral protrusion set inside the pier cap beam 4, which engages with the shear groove 201, thereby improving the shear strength between the original pier 2 and the pier cap beam 4 and ensuring the reliability of the support force transmission. To meet different usage requirements, the shear groove can be designed to be arranged in a ring shape around the outer wall of the original pier, which can also enhance the bonding strength.

[0054] As a further preferred embodiment, multiple rebar holes are provided on the original pier 2, extending radially along the original pier 2, and the multiple rebar holes are spaced apart in the circumferential direction of the original pier 2; the anchoring structure 20 also includes multiple anchor bars 202, such as... Figure 6 As shown, the anchor bar 202 is inserted and fixed in the rebar hole, with one end protruding outward from the outside of the original pier 2 and fixedly connected to the abutment beam 4. By inserting and fixing the anchor bar 202 in the rebar hole and making the other end protrude outward, the stress depth of the original pier 2 can be increased, thus forming a high-strength connection between the original pier 2 and the abutment beam 4.

[0055] It should be noted that the shear groove 201 is staggered from the structural reinforcement of the original pier 2, and the anchor bar 202 is also staggered from the structural reinforcement of the original pier 2. Furthermore, the anchoring holes are filled with anchoring adhesive for fixing and connecting the anchor bars 202. Both the shear groove 201 and the anchor bars 202 must avoid damaging the structural reinforcement of the original pier 2 to ensure the structural strength of the original pier 2. The anchoring adhesive effectively bonds and fixes the anchor bars 202 in the anchoring holes, ensuring that the anchor bars 202 are firmly embedded inside the original pier 2.

[0056] Furthermore, the alternating arrangement of reinforcing piles 3 and the original piers 2 along the width of the upper beam 1, and the uniform spacing between them, ensures the balance of the pile foundation support forces. Both the reinforcing piles 3 and the temporary support piles 5 are cast-in-place pile structures. The structural reinforcement of both the reinforcing piles 3 and the temporary support piles 5 are segmented steel cages. These segmented steel cages are connected using straight threaded sleeves after hoisting into place. The segmented processing and splicing during hoisting adapts to the limited space under the bridge during construction.

[0057] The bridge pile reinforcement method used in the aforementioned existing long-span bridge structure underpinning and reinforcement system includes the following steps:

[0058] S1, such as Figure 1As shown, multiple reinforcing piles 3 and multiple temporary support piles 5 are installed on the outside of the original pier 2. In step S1, when constructing the reinforcing piles 3 and temporary support piles 5, the control is carried out according to the indicators of pile bottom elevation and rock penetration depth; when drilling the bored pile, high-quality mud is used to form mud wall protection, the sediment in the hole is cleaned and the sediment thickness is controlled to be no more than 50mm, the hole position deviation of the bored pile is no less than 100mm, the inclination is no more than 2.5‰, and steel casing is used for protection when pouring the pile foundation concrete.

[0059] It should be noted that the structural reinforcement of the reinforcing pile 3 and the structural reinforcement of the temporary support pile 5 are both processed into segmented steel cages to adapt to the limited construction conditions under the bridge. During hoisting, the segmented steel cages are connected in sequence, and the main bars of the segmented steel cages are connected with straight threaded sleeves. After the steel cages are in place in the hole, they are fixed and limited to prevent them from floating or tilting, and to meet the minimum protective layer thickness requirements of the reinforced concrete.

[0060] S2, such as Figure 2 As shown, a steel support 51, a jack 52, and a steel support beam 53 are sequentially installed on the support section 50 of the temporary support pile 5. The steel support beam 53 is located on the lower side of the upper beam 1 and extends along the width direction of the upper beam 1. Specifically, the steel support beam 53 is an I-beam, which has better bending and shear resistance and can provide balanced support for the upper beam 1.

[0061] S3. The jacks 52 are controlled synchronously according to the set pre-jacking force to support the upper beam 1 through the steel support beam 53; the jacks 52 generate the same support force synchronously to ensure a reliable supporting effect at different positions of the upper beam 1.

[0062] S4. Construct the pier cap beam 4 between the original pier 2 and the reinforcement pile 3, such as Figure 3 As shown, the pier cap beam 4 surrounds the exterior of the original pier 2 and is fixedly connected to the top of the reinforcing pile 3. It should be noted that in step S4, the pier cap beam foundation pit is excavated, and the original pier 2 is monitored in real time; according to the design requirements, shear grooves 201 are opened on the outer wall of the original pier 2, and the depth of the shear grooves 201 is controlled to be any size from 30mm to 60mm, and the shear grooves 201 are staggered from the structural reinforcement of the original pier 2 to avoid damaging the structural reinforcement of the original pier 2, thus ensuring the structural strength of the original pier 2.

[0063] Before anchoring the rebar, non-destructive testing equipment is used to locate the structural rebar, and the anchoring hole positions are checked and marked to ensure that the anchoring hole positions are staggered from the structural rebar of the original pier 2. Drilling is carried out according to the markings, and the hole depth is controlled to be the same as the embedment depth of the anchor bar 202. The anchoring hole is then cleaned. Then, anchoring adhesive is injected into the anchoring hole, gradually injecting adhesive from the bottom of the hole outwards, controlling the injection depth to two-thirds of the hole depth. The surface dirt of the anchor bar 202 is cleaned, and the anchor bar 202 is rotated and inserted into the bottom of the anchoring hole. The anchor bar 202 is not disturbed before the anchoring adhesive cures.

[0064] Furthermore, in step S4, a concrete cushion layer 42 is first poured in the foundation pit of the pier beam, and then the structural steel bars 41 of the pier beam 4 are tied and connected to the anchor bars 202; the concrete surface of the original pier 2 is cleaned and roughened by rough chisel or sandblasting; an interface adhesive is applied to the concrete surface of the original pier 2, and after the first layer of interface adhesive penetrates into the concrete and becomes gelled, a second layer of interface adhesive is applied as a bonding layer; while the interface adhesive is within its applicable period, the concrete of the pier beam 4 is poured in one go, and curing work is carried out after the pouring is completed.

[0065] S5. Remove the steel support 51, jack 52, and steel support beam 53 on the support unit 50, as follows: Figure 4 As shown, an integral foundation structure consisting of the original pier 2, the reinforcing pile 3, and the abutment beam 4 was obtained, which can ensure the stability and reliability of the bridge reinforcement effect.

[0066] The specific embodiments of the bridge pile reinforcement method for the existing long-span bridge structure underpinning and reinforcement system of the present invention are the same as the specific embodiments of the bridge pile reinforcement method for the existing long-span bridge structure underpinning and reinforcement system described in the above-mentioned specific embodiments of the invention, and will not be repeated here.

[0067] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A system for supporting and reinforcing existing long-span bridge structures, characterized in that, It includes the upper beam, the original pier, the reinforcing piles, the pier cap beam and the temporary supporting piles, wherein the original pier, the reinforcing piles, the pier cap beam and the temporary supporting piles are all located on the lower side of the upper beam; The original bridge piers are provided in at least two, and the at least two original bridge piers are distributed at intervals along the width direction of the upper beam, and the at least two original bridge piers are respectively supported by the upper beam. The reinforcement piles are provided in multiple quantities, and the multiple reinforcement piles are arranged vertically at intervals with the upper beam body, and the multiple reinforcement piles and at least two original bridge piers are distributed at intervals along the width direction of the upper beam body; The pier cap beam extends parallel to the width direction of the upper beam body. The pier cap beam is fixedly connected to the top of the multiple reinforcing piles, and the pier cap beam surrounds the outside of the original bridge pier. An anchoring structure is provided between the pier cap beam and the original bridge pier. The temporary support piles are provided in multiples, and the multiple temporary support piles are distributed at intervals along the width direction of the upper beam. The temporary support piles and the original bridge piers are arranged at intervals along the length direction of the upper beam. The upper part of the temporary support piles is provided with a replacement support part, which is used to detachably install steel supports, jacks and steel support beams. The temporary support piles, steel supports, jacks, and steel support beams are used to support the upper beam, preventing the disturbance of the excavated strata from causing instability to the original piers and the upper beam. The original piers, the reinforcement piles, and the abutment beam form an integral foundation structure, avoiding the independent support of the new abutment by the replacement piles.

2. The existing long-span bridge structure underpinning and reinforcement system according to claim 1, characterized in that, The anchoring structure includes a shear groove formed on the original pier, the shear groove being arranged in a spiral or circular shape around the outer wall of the original pier, and the interior of the pier cap beam having an interlocking part that cooperates with the shear groove.

3. The existing long-span bridge structure underpinning and reinforcement system according to claim 2, characterized in that, The original bridge pier has multiple anchor holes, which extend radially along the original bridge pier and are spaced apart in the circumferential direction of the original bridge pier. The anchoring structure also includes multiple anchor bars, which are inserted and fixed in the anchor holes. The ends of the anchor bars protrude from the outside of the original pier and are fixedly connected to the pier cap beam.

4. The existing long-span bridge structure underpinning and reinforcement system according to claim 3, characterized in that, The shear groove is staggered from the structural reinforcement of the original pier, the anchor bar is staggered from the structural reinforcement of the original pier, and the anchoring hole is filled with anchoring adhesive for fixing the anchor bar.

5. The existing long-span bridge structure underpinning and reinforcement system according to claim 1, characterized in that, The reinforcing piles and the original piers are arranged alternately along the width direction of the upper beam, and the reinforcing piles and the original piers are evenly spaced along the width direction of the upper beam.

6. The existing long-span bridge structure underpinning and reinforcement system according to claim 1, characterized in that, The reinforcing pile and the temporary support pile are both cast-in-place pile structures. The structural reinforcement of the reinforcing pile and the structural reinforcement of the temporary support pile are both segmented steel cages, and the segmented steel cages are connected by straight threaded sleeves after being hoisted into place.

7. A method for reinforcing bridge piles in the existing long-span bridge structure underpinning and reinforcement system described in claim 1, characterized in that, Includes the following steps: S1. Install multiple reinforcing piles and multiple temporary support piles on the outside of the original bridge piers; S2. Install steel supports, jacks and steel support beams in sequence on the support portion of the temporary support pile. The steel support beams are located on the lower side of the upper beam and extend along the width direction of the upper beam. S3. The jacks are synchronously controlled according to the set pre-jacking force to support the upper beam body through the steel support beam; S4. Construct a pier cap beam between the original pier and the reinforcement pile. The pier cap beam surrounds the outside of the original pier and is fixedly connected to the top of the reinforcement pile. S5. Remove the steel supports, jacks and steel support beams on the replacement support.

8. The bridge pile reinforcement method of the existing long-span bridge structure underpinning and reinforcement system according to claim 7, characterized in that, In step S1, when constructing the reinforcing piles and the temporary support piles, the control is carried out according to the indicators of pile bottom elevation and rock penetration depth; when drilling the cast-in-place piles, mud is used to form mud wall protection, the sediment in the hole is cleaned and the sediment thickness is controlled to be no more than 50mm, the hole position deviation of the drilled pile is no less than 100mm, the inclination is no more than 2.5‰, and steel casing is used for protection when pouring the pile foundation concrete; The structural reinforcement bars of the reinforcing piles and the structural reinforcement bars of the temporary support piles are all processed into steel cages in sections. During hoisting, the sectioned steel cages are connected in sequence. The main bars of the sectioned steel cages are connected with straight threaded sleeves. After the steel cages are in place in the hole, they are fixed and limited to prevent them from floating or tilting, and to meet the minimum protective layer thickness requirements of reinforced concrete.

9. The bridge pile reinforcement method of the existing long-span bridge structure underpinning and reinforcement system according to claim 7, characterized in that, In step S4, the foundation pit of the pier is excavated and the original pier is monitored in real time; according to the design requirements, shear grooves are opened on the outer wall of the original pier, the depth of the shear grooves is controlled to be any size from 30mm to 60mm, and the shear grooves are staggered from the structural steel bars of the original pier. Before installing the rebar, non-destructive testing equipment is used to locate the structural rebar, and the rebar hole positions are checked and marked to ensure that the rebar hole positions are staggered from the original structural rebar of the pier. Drilling is carried out according to the markings, and the hole depth is controlled to be the same as the embedment depth of the anchor bar. The rebar hole is then cleaned. Inject anchoring adhesive into the anchoring hole, gradually injecting the adhesive from the bottom of the hole outwards, controlling the injection depth to two-thirds of the hole depth; clean the surface dirt of the anchoring bar, and rotate the anchoring bar into the bottom of the anchoring hole, avoiding disturbing the anchoring bar before the anchoring adhesive cures.

10. The bridge pile reinforcement method of the existing long-span bridge structure underpinning and reinforcement system according to claim 7, characterized in that, In step S4, the structural steel bars for the pier beam are tied and connected to the anchor bars in the foundation pit; the concrete surface of the original pier is cleaned and roughened by chiseling or sandblasting. The concrete surface of the original bridge pier is coated with an interface adhesive. After the first layer of interface adhesive penetrates into the concrete and becomes gelled, a second layer of interface adhesive is applied as a bonding layer. While the interface adhesive is within its applicable period, the concrete for the foundation beam is poured in one go, and curing is carried out after the pouring is completed.

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