Underpinning reinforcing system and bridge pile reinforcing method for existing long-span bridge structure

Abstract

The invention relates to the technical field of bridge reinforcement, and discloses an underpinning reinforcement system and a bridge pile reinforcement method for an existing long-span bridge structure, the underpinning reinforcement system comprises an upper beam body, and an original bridge pier, a reinforcement pile, a bearing platform beam and a temporary bearing pile which are arranged on the lower side of the upper beam body; the at least two original bridge piers are distributed at intervals in the width direction of the upper beam body, and the original bridge piers are matched with the upper beam body in a vertical supporting mode; the multiple reinforcing piles and the upper beam body are vertically arranged at intervals, and the multiple reinforcing piles and the at least two original bridge piers are distributed at intervals in the width direction of the upper beam body; the bearing platform beam is parallel to the width direction of the upper beam body, the bearing platform beam is fixedly connected with the tops of the multiple reinforcing piles, the bearing platform beam is arranged outside the original pier in a surrounding mode, and an anchoring structure is arranged between the bearing platform beam and the original pier; the temporary bearing piles are distributed in the width direction of the upper beam body at intervals, the temporary bearing piles and the original pier are arranged in the length direction of the upper beam body at intervals, and underpinning supporting parts are arranged on the upper portions of the temporary bearing piles and used for detachably installing steel supports, jacks and steel bearing beams.

Description

Technical Field

[0001] The invention relates to the technical field of bridge reinforcement, and in particular to an existing large-span bridge structure underpinning reinforcement system and a bridge pile reinforcement method. Background Art

[0002] At present, highway bridges usually adopt beam bridge structures, which mainly include upper beams, piers and abutments. Beam bridges have the advantages of simple structure, convenient construction and good economy, and have been widely used in highway and railway transportation projects.

[0003] In fact, due to geological changes or overload of bridges, there may be a risk of bridge structure sinking, and the bridge foundation needs to be reinforced in time. For example, the Chinese invention patent with authorization announcement number CN105002835B and authorization announcement date 2017.01.11 discloses a method for bridge underpinning under an open-cut tunnel. The specific steps are: 1. Under the bridge, the lateral steel support of the bridge is supported by Bailey beams, and a jack is set between the steel support and the Bailey beam support; 2. Casting support piles, adjusting the jacks under the steel support, so that the load is transferred from the Bailey beam support to the support piles; 3. Setting a new pedestal between the bridge piers, setting a replacement pile under the new pedestal, and setting a jack between the new pedestal and the replacement pile, and adjusting the settlement of the bridge pier by raising and lowering the jack; replacing the above jacks with bearings or steel pads.

[0004] The existing bridge underpinning method is to set up a new cap between the original bridge piers and support the new cap through the underpinning piles. However, each underpinning pile independently supports the new cap, which may cause unbalanced force on the new cap. The underpinning piles and the original bridge 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 the present invention is that each underpinning pile independently supports the new pier, which may cause unbalanced force on the new pier. The underpinning 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] In order to solve the above technical problems, the present invention provides a technical solution for an existing long-span bridge structure underpinning and reinforcement system:

[0007] The existing large-span bridge structure underpinning and reinforcement system comprises an upper beam, original bridge piers, reinforcement piles, a cap beam and temporary supporting piles, wherein the original bridge piers, the reinforcement piles, the cap beam and the temporary supporting piles are all arranged on the lower side of the upper beam;

[0008] There are at least two original bridge piers, and at least two original bridge piers are spaced apart along the width direction of the upper beam body, and at least two original bridge piers are respectively matched with the vertical support of the upper beam body;

[0009] There are a plurality of reinforcement piles, and the plurality of reinforcement piles are respectively arranged vertically spaced apart from the upper beam body, and the plurality of reinforcement piles and at least two original bridge piers are spaced apart along the width direction of the upper beam body;

[0010] The cap beam is arranged to extend parallel to the width direction of the upper beam body, the cap beam is fixedly connected to the tops of the plurality of reinforcement piles respectively, and the cap beam is arranged to surround the outside of the original bridge pier, and an anchoring structure is provided between the cap beam and the original bridge pier;

[0011] There are multiple temporary supporting piles, which are spaced apart along the width direction of the upper beam body, and the temporary supporting piles and the original bridge piers are spaced apart along the length direction of the upper beam body. A replacement support portion is provided on the upper part of the temporary supporting pile, and the replacement support portion is used for detachably installing a steel support, a jack and a steel supporting beam.

[0012] Furthermore, the anchoring structure includes a shear groove opened on the original pier, the shear groove is arranged in a spiral or circular shape around the outer wall of the original pier, and the interior of the pedestal beam is provided with an engaging portion that cooperates with the shear groove.

[0013] Furthermore, a plurality of reinforcing bar holes are provided on the original bridge pier, the reinforcing bar holes are extended along the radial direction of the original bridge pier, and the plurality of reinforcing bar holes are distributed at intervals in the circumferential direction of the original bridge pier;

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

[0015] Furthermore, the shear grooves are staggered with the structural reinforcement of the original bridge pier, the anchor bars are staggered with the structural reinforcement of the original bridge pier, and the anchor bar holes are filled with anchor bar glue for fixing and connecting the anchor bars.

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

[0017] Furthermore, the reinforcement piles and the temporary supporting piles are respectively cast-in-place pile structures, the structural reinforcement of the reinforcement piles and the structural reinforcement of the temporary supporting piles are both segmented steel cages, and the segmented steel cages are connected with straight threaded sleeves after being hoisted into place.

[0018] In order to solve the above technical problems, the present invention also provides a technical solution for a bridge pile reinforcement method of an existing long-span bridge structure underpinning reinforcement system:

[0019] The bridge pile reinforcement method for the above-mentioned existing large-span bridge structure underpinning reinforcement system comprises the following steps:

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

[0021] S2, sequentially installing a steel support, a jack and a steel support beam on the underpinning support portion of the temporary support pile, wherein the steel support beam is located at the lower side of the upper beam body and extends along the width direction of the upper beam body;

[0022] S3, synchronously controlling the jacks to support the upper beam according to the set pre-supporting force, so as to support and cooperate with the upper beam body through the steel supporting beam;

[0023] S4, constructing a cap beam between the original bridge pier and the reinforcement pile, wherein the cap beam is disposed outside the original bridge pier and is fixedly connected to the top of the reinforcement pile;

[0024] S5, removing the steel supports, jacks and steel support beams on the underpinning support.

[0025] Furthermore, in step S1, when constructing the reinforcement pile and the temporary supporting pile, the pile bottom elevation and the rock penetration depth are controlled; when the bored pile is bored, mud is used to form a mud wall, the sediment in the hole is cleaned and the sediment thickness is controlled to be no more than 50 mm, the bored pile hole position deviation is no less than 100 mm, the inclination is no more than 2.5‰, and when pouring the pile foundation concrete, a steel casing is used for protection;

[0026] The structural steel bars of the reinforcement piles and the structural steel bars of the temporary supporting piles are processed into steel cages in sections. The sectioned steel cages are connected in sequence during hoisting. 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 the steel cages from floating or tilting, and to meet the minimum protective layer thickness requirements for reinforced concrete.

[0027] Further, in step S4, a foundation pit for the cap beam is excavated, and the original bridge pier is monitored in real time; a shear groove is opened on the outer wall of the original bridge pier according to the design requirements, the depth of the shear groove is controlled to be any size of 30 mm to 60 mm, and the shear groove is staggered with the structural reinforcement of the original bridge pier;

[0028] Before planting reinforcement, use non-destructive detection equipment to find out the position of structural reinforcement, check and mark the position of the reinforcement hole, and control the position of the reinforcement hole to be staggered with the structural reinforcement of the original pier; drill holes according to the marks, control the hole depth to be the same as the buried depth of the anchor bar, and clean the reinforcement hole;

[0029] Inject anchoring glue into the anchor hole, gradually injecting from the bottom of the hole to the outside, and control the injection depth to two-thirds of the hole depth; clean the surface dirt of the anchor bar, and rotate the anchor bar to insert it into the bottom of the hole, avoiding disturbing the anchor bar before the anchor glue solidifies.

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

[0031] Interface glue is applied to the concrete surface of the original pier. After the first layer of interface glue penetrates into the concrete and is in a gelled state, a second layer of interface glue is applied as a bonding layer. While the interface glue is within the applicable period, the concrete of the pedestal beam is poured at one time, and maintenance work is carried out after the pouring is completed.

[0032] Compared with the prior art, the existing large-span bridge structure underpinning and reinforcement system and bridge pile reinforcement method of the present invention have the following beneficial effects: the existing large-span bridge structure underpinning and reinforcement system adopts the design form of an upper beam, original bridge piers, reinforcement piles, abutment beams and temporary supporting piles. The original bridge piers, reinforcement piles, abutment beams and temporary supporting piles are all arranged on the lower side of the upper beam, and at least two original bridge piers are spaced apart along the width direction of the upper beam. Before construction, the upper beam is mainly supported by at least two original bridge piers. A plurality of reinforcement piles are provided, and the plurality of reinforcement piles are arranged vertically spaced apart from the upper beam, and the plurality of reinforcement piles and at least two original bridge piers are spaced apart along the width direction of the upper beam. By providing a plurality of reinforcement piles, the number and distribution density of the bridge foundation piles are increased, thereby ensuring the stress reliability of the entire bridge pile foundation.

[0033] The cap beam is arranged to extend parallel to the width direction of the upper beam body, and is fixedly connected to the tops of multiple reinforcement piles respectively, and is surrounded by the outside of the original bridge piers. The cap beam is located on the lower side of the upper beam body and is fixedly connected to the reinforcement piles and the original bridge piers respectively. An anchoring structure is provided between the cap beam and the original bridge piers. The anchoring structure can ensure the bonding strength between the cap beam and the original bridge piers, avoid weak parts in the force transmission path, and make the original bridge piers, reinforcement piles and cap beams form an integral foundation structure. Multiple reinforcement piles and multiple original bridge piers can evenly transfer the vertical support forces at different positions to the cap beam, and then effectively support the upper beam body through the part of the original bridge pier located on the upper side of the cap beam.

[0034] In addition, multiple temporary supporting piles are provided, and the multiple temporary supporting piles are spaced apart along the width direction of the upper beam body, and the temporary supporting piles and the original bridge piers are spaced apart along the length direction of the upper beam body. During the reinforcement construction process, the steel support, jack and steel supporting beam are installed on the underpinning support part. The temporary supporting piles, steel support, jack and steel supporting beam can play a supporting role on the upper beam body, thereby ensuring the structural stability of the upper beam body during the underpinning. At the same time, when the reinforcement piles and the pedestal beam are excavated and poured, the original bridge piers and the upper beam body are prevented from being unstable due to stratum disturbance. The original bridge piers, reinforcement piles and pedestal beams of the underpinning reinforcement system form an integral foundation structure, which avoids the existing underpinning piles from independently supporting and cooperating with the new pedestal, improves the force balance of the pedestal beam, and thus ensures the stability and reliability of the bridge reinforcement effect. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0037] Figure 3 is a structural schematic diagram of the existing large-span bridge structure underpinning and reinforcement system in step S4 in an embodiment of the present invention;

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

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

[0040] Figure 6 is a top view schematic diagram of the original bridge pier, the cap beam and the embodiment of the present invention;

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

[0042] In the figure: 1-upper beam, 2-original pier, 20-anchor structure, 201-shear groove, 202-anchor bar, 3-reinforcement pile, 4-capping beam, 41-structural steel bar, 42-concrete cushion, 5-temporary supporting pile, 50-replacement support, 51-steel support, 52-jack, 53-steel supporting beam. DETAILED DESCRIPTION

[0043] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0044] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like used in the present invention to indicate the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0045] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0046] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] like Figures 1 to 7 As shown, an existing large-span bridge structure replacement and reinforcement system of an embodiment of the present invention includes an upper beam body 1, original piers 2, reinforcement piles 3, pedestal beams 4 and temporary supporting piles 5, wherein the original piers 2, reinforcement piles 3, pedestal beams 4 and temporary supporting piles 5 are all arranged on the lower side of the upper beam body 1; there are at least two original piers 2, at least two original piers 2 are spaced apart along the width direction of the upper beam body 1, and at least two original piers 2 are respectively coordinated with the upper beam body 1 for vertical support.

[0048] A plurality of reinforcement piles 3 are provided, and the plurality of reinforcement piles 3 are respectively arranged vertically spaced apart from the upper beam body 1, and the plurality of reinforcement piles 3 and at least two original bridge piers 2 are spaced apart along the width direction of the upper beam body 1; the pedestal beam 4 is extended and arranged parallel to the width direction of the upper beam body 1, and the pedestal beam 4 is respectively fixedly connected to the tops of the plurality of reinforcement piles 3, and the pedestal beam 4 is surrounded and arranged outside the original bridge pier 2, and an anchoring structure 20 is provided between the pedestal beam 4 and the original bridge pier 2.

[0049] A plurality of temporary supporting piles 5 are provided, and the plurality of temporary supporting piles 5 are spaced apart along the width direction of the upper beam body 1, and the temporary supporting piles 5 and the original bridge piers 2 are spaced apart along the length direction of the upper beam body 1. A replacement support portion 50 is provided on the upper portion of the temporary supporting piles 5, and the replacement support portion 50 is used for detachably installing a steel support 51, a jack 52 and a steel supporting beam 53.

[0050] The existing large-span bridge structure replacement and reinforcement system adopts the design form of an upper beam body 1, original bridge piers 2, reinforcement piles 3, abutment beams 4 and temporary supporting piles 5. The original bridge piers 2, reinforcement piles 3, abutment beams 4 and temporary supporting piles 5 are all arranged on the lower side of the upper beam body 1. At least two original bridge piers 2 are spaced apart along the width direction of the upper beam body 1. Before construction, the upper beam body 1 is mainly supported by at least two original bridge piers 2. There are multiple reinforcement piles 3, and the multiple reinforcement piles 3 are arranged vertically spaced apart from the upper beam body 1, and the multiple reinforcement piles 3 and at least two original bridge piers 2 are spaced apart along the width direction of the upper beam body 1. By setting up multiple reinforcement piles 3, the number and distribution density of the bridge foundation piles are increased, thereby ensuring the force reliability of the entire bridge pile foundation.

[0051] The cap beam 4 is arranged to extend parallel to the width direction of the upper beam body 1, and the cap beam 4 is fixedly connected to the top of multiple reinforcement piles 3 respectively, and the cap beam 4 is surrounded and arranged outside the original bridge pier 2. The cap beam 4 is located on the lower side of the upper beam body 1 and is fixedly connected to the reinforcement piles 3 and the original bridge pier 2 respectively. An anchoring structure 20 is provided between the cap beam 4 and the original bridge pier 2. The anchoring structure 20 can ensure the bonding strength between the cap beam 4 and the original bridge pier 2, avoid the existence of weak parts in the force transmission path, and make the original bridge pier 2, the reinforcement piles 3 and the cap beam 4 form an integral foundation structure. Multiple reinforcement piles 3 and multiple original bridge piers 2 can evenly transfer the vertical support force at different positions to the cap beam 4, and then effectively support the upper beam body 1 through the part of the original bridge pier 2 located on the upper side of the cap beam 4.

[0052] In addition, a plurality of temporary supporting piles 5 are provided, and the plurality of temporary supporting piles 5 are spaced apart along the width direction of the upper beam body 1, and the temporary supporting piles 5 and the original bridge piers 2 are spaced apart along the length direction of the upper beam body 1. During the reinforcement construction process, the steel support 51, the jack 52 and the steel supporting beam 53 are installed by using the underpinning support part 50, and the temporary supporting piles 5, the steel support 51, the jack 52 and the steel supporting beam 53 can play a supporting role for the upper beam body 1, thereby ensuring the structural stability of the upper beam body 1 during underpinning, and at the same time, when the reinforcement piles 3 and the pedestal beam 4 are excavated and poured, the original bridge piers 2 and the upper beam body 1 are prevented from being destabilized by the stratum disturbance. The original bridge piers 2, the reinforcement piles 3 and the pedestal beam 4 of the underpinning reinforcement system form an integral foundation structure, which avoids the existing underpinning piles from independently supporting and cooperating with the new pedestal, improves the force balance of the pedestal beam 4, and thus ensures the stability and reliability of the bridge reinforcement effect.

[0053] In this embodiment, the anchoring structure 20 includes a shear groove 201 opened on the original pier 2. Figure 7 As shown, the shear groove 201 is arranged in a spiral or annular shape around the outer wall of the original bridge pier 2, and the interior of the cap beam 4 is provided with a bite portion that cooperates with the shear groove 201. Specifically, the bite portion is a spiral protrusion arranged inside the cap beam 4, and the spiral protrusion is engaged with the shear groove 201, thereby improving the shear strength between the original bridge pier 2 and the cap beam 4, and ensuring the reliability of the support force transmission. In order to meet different usage requirements, the shear groove can be designed to be arranged in a circular shape around the outer wall of the original bridge pier, which can also play a role in enhancing the bonding strength.

[0054] As a further preferred solution, a plurality of reinforcing bar holes are provided on the original pier 2, and the reinforcing bar holes are extended along the radial direction of the original pier 2, and the plurality of reinforcing bar holes are distributed at intervals in the circumferential direction of the original pier 2; the anchoring structure 20 also includes a plurality of anchoring bars 202, such as Figure 6 As shown, the anchor bar 202 is inserted and fixed in the anchor hole, and the end of the anchor bar 202 protrudes outward from the outside of the original bridge pier 2 and is fixedly connected to the cap beam 4. The anchor bar 202 is inserted and fixed in the anchor hole and the other end protrudes outward. The anchor bar 202 can increase the stress depth of the original bridge pier 2, so that a high-strength connection is formed between the original bridge pier 2 and the cap beam 4.

[0055] It should be noted that the shear groove 201 is staggered with the structural steel bars of the original pier 2, the anchor bars 202 are staggered with the structural steel bars of the original pier 2, and the anchor bars holes are filled with anchor bar glue for fixing the anchor bars 202. The shear groove 201 and the anchor bars 202 should avoid damaging the structural steel bars of the original pier 2 to ensure the structural strength of the original pier 2, and the anchor bar glue can effectively bond and fix the anchor bars 202 in the anchor bar holes, ensuring that the anchor bars 202 are firmly implanted in the original pier 2.

[0056] In addition, the reinforcement piles 3 and the original bridge piers 2 are arranged alternately in the width direction of the upper beam 1, and the reinforcement piles 3 and the original bridge piers 2 are evenly spaced along the width direction of the upper beam 1, ensuring the balance of the pile foundation support force. The reinforcement piles 3 and the temporary supporting piles 5 are cast-in-place pile structures, and the structural steel bars of the reinforcement piles 3 and the structural steel bars of the temporary supporting piles 5 are both segmented steel cages, and the segmented steel cages are connected with straight threaded sleeves after being hoisted into place, and are processed in sections and extended during hoisting, which can adapt to the construction conditions with limited space under the bridge.

[0057] The bridge pile reinforcement method for the above-mentioned existing large-span bridge structure underpinning reinforcement system comprises the following steps:

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

[0059] It should be noted that the structural steel bars of the reinforcement pile 3 and the structural steel bars of the temporary supporting pile 5 are processed into steel cages in sections to adapt to the construction conditions of limited space under the bridge. When 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 the steel cages from floating or tilting, and meet the minimum protective layer thickness requirements of 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 underpinning support portion 50 of the temporary support pile 5, and the steel support beam 53 is located at the lower side of the upper beam body 1 and extends along the width direction of the upper beam body 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 body 1.

[0061] S3. Synchronously control the jack 52 to support according to the set pre-pushing force, so as to support and cooperate with the upper beam body 1 through the steel supporting beam 53; synchronously generate the same supporting force through the jack 52 to ensure a reliable supporting effect for different positions of the upper beam body 1.

[0062] S4, construct the cap beam 4 between the original bridge pier 2 and the reinforcement pile 3, such as Figure 3 As shown, the cap beam 4 is surrounded and arranged outside the original bridge pier 2, and is fixedly connected to the top of the reinforcement pile 3. It should be noted that in step S4, the cap beam foundation pit is excavated, and the original bridge pier 2 is monitored in real time; the shear groove 201 is opened on the outer wall of the original bridge pier 2 according to the design requirements, and the depth of the shear groove 201 is controlled to be any size of 30mm to 60mm, and the shear groove 201 is staggered with the structural steel bars of the original bridge pier 2 to avoid damaging the structural steel bars of the original bridge pier 2, thereby ensuring the structural strength of the original bridge pier 2.

[0063] Among them, before planting the reinforcement, non-destructive detection equipment is used to find out the position of the structural reinforcement, check and mark the position of the reinforcement hole, and control the position of the reinforcement hole to be staggered with the structural reinforcement of the original pier 2; drill holes according to the marks, control the hole depth to be the same as the buried depth of the anchor bar 202, and clean the reinforcement hole; then, inject reinforcement glue into the reinforcement hole, gradually inject glue from the bottom of the reinforcement hole to the outside, and control the injection depth to two-thirds of the hole depth; clean the surface dirt of the anchor bar 202, and rotate the anchor bar 202 to insert it into the bottom of the reinforcement hole to avoid disturbing the anchor bar 202 before the reinforcement glue solidifies.

[0064] Furthermore, in step S4, a layer of concrete cushion 42 is first poured in the foundation pit of the pedestal beam, and then the structural reinforcement 41 of the pedestal beam 4 is tied and made, and the structural reinforcement 41 of the pedestal beam 4 is tied and connected with the anchor bar 202; the concrete surface of the original pier 2 is cleaned, and the surface is roughened by rough chiseling or sandblasting; the concrete surface of the original pier 2 is coated with interface glue, and after the first layer of interface glue penetrates into the concrete and is in a gelled state, a second layer of interface glue is coated as a bonding layer; while the interface glue is within the applicable period, the concrete of the pedestal beam 4 is poured once, and maintenance work is carried out after the pouring is completed.

[0065] S5, dismantle the steel support 51, the jack 52 and the steel support beam 53 on the underpinning support part 50, such as Figure 4 As shown, an integral foundation structure consisting of the original bridge pier 2, the reinforcement piles 3 and the cap beam 4 is obtained, thereby ensuring the stability and reliability of the bridge reinforcement effect.

[0066] The specific embodiments of the method for reinforcing piles of an existing large-span bridge structure underpinning and reinforcement system of the present invention are the same as the specific embodiments of the method for reinforcing piles of an existing large-span bridge structure underpinning and reinforcement system in the specific implementation mode of the above-mentioned invention, and will not be repeated here.

[0067] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. An existing long-span bridge structure underpinning and reinforcement system, characterized in that: It includes an upper beam, original bridge piers, reinforcement piles, a cap beam and temporary supporting piles, wherein the original bridge piers, the reinforcement piles, the cap beam and the temporary supporting piles are all arranged at the lower side of the upper beam; There are at least two original bridge piers, and at least two original bridge piers are spaced apart along the width direction of the upper beam body, and at least two original bridge piers are respectively matched with the vertical support of the upper beam body; There are a plurality of reinforcement piles, and the plurality of reinforcement piles are respectively arranged vertically spaced apart from the upper beam body, and the plurality of reinforcement piles and at least two original bridge piers are spaced apart along the width direction of the upper beam body; The cap beam is arranged to extend parallel to the width direction of the upper beam body, the cap beam is fixedly connected to the tops of the plurality of reinforcement piles respectively, and the cap beam is arranged to surround the outside of the original bridge pier, and an anchoring structure is provided between the cap beam and the original bridge pier; There are multiple temporary supporting piles, which are spaced apart along the width direction of the upper beam body, and the temporary supporting piles and the original bridge piers are spaced apart along the length direction of the upper beam body. A replacement support portion is provided on the upper part of the temporary supporting pile, and the replacement support portion is used for detachably installing a steel support, a jack and a steel supporting beam.

2. The existing long-span bridge structure underpinning and reinforcement system according to claim 1 is characterized in that: The anchoring structure includes a shear groove opened on the original pier, the shear groove is arranged in a spiral or circular shape around the outer wall of the original pier, and an engaging portion cooperating with the shear groove is provided inside the cap beam.

3. The existing long-span bridge structure underpinning and reinforcement system according to claim 2 is characterized in that: A plurality of reinforcing bar holes are provided on the original pier, the reinforcing bar holes are extended along the radial direction of the original pier, and the plurality of reinforcing bar holes are distributed at intervals in the circumferential direction of the original pier; The anchoring structure further includes a plurality of anchoring bars, which are inserted and fixed in the anchoring holes, and ends of the anchoring bars protrude from the outside of the original pier and are fixedly connected to the cap beam.

4. The existing long-span bridge structure underpinning and reinforcement system according to claim 3 is characterized in that: The shear grooves are staggered with the structural reinforcement of the original pier, the anchor bars are staggered with the structural reinforcement of the original pier, and the anchor holes are filled with anchor glue for fixing and connecting the anchor bars.

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

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

7. A method for reinforcing bridge piles for the existing long-span bridge structure underpinning and reinforcement system as claimed in claim 1, characterized in that: The following steps are involved: S1. Install multiple reinforcement piles and multiple temporary supporting piles on the outside of the original bridge piers; S2, sequentially installing a steel support, a jack and a steel support beam on the underpinning support portion of the temporary support pile, wherein the steel support beam is located at the lower side of the upper beam body and extends along the width direction of the upper beam body; S3, synchronously controlling the jacks to support the upper beam according to the set pre-supporting force, so as to support and cooperate with the upper beam body through the steel supporting beam; S4, constructing a cap beam between the original bridge pier and the reinforcement pile, wherein the cap beam is disposed outside the original bridge pier and is fixedly connected to the top of the reinforcement pile; S5, removing the steel supports, jacks and steel support beams on the underpinning support.

8. The method for reinforcing piles of an existing long-span bridge structure underpinning and reinforcing system according to claim 7 is characterized in that: In step S1, when constructing the reinforcement pile and the temporary supporting pile, the pile bottom elevation and the rock penetration depth are controlled; when the bored pile is bored, mud is used to form a mud wall, the sediment in the hole is cleaned and the sediment thickness is controlled to be no more than 50 mm, the bored pile hole position deviation is no less than 100 mm, the inclination is no more than 2.5‰, and when pouring the pile foundation concrete, a steel casing is used for protection; The structural steel bars of the reinforcement piles and the structural steel bars of the temporary supporting piles are processed into steel cages in sections. The sectioned steel cages are connected in sequence during hoisting. 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 the steel cages from floating or tilting, and to meet the minimum protective layer thickness requirements for reinforced concrete.

9. The method for reinforcing piles of an existing long-span bridge structure underpinning and reinforcing system according to claim 7 is characterized in that: In step S4, a foundation pit for the cap beam is excavated, and the original bridge pier is monitored in real time; a shear groove is opened on the outer wall of the original bridge pier according to the design requirements, the depth of the shear groove is controlled to be any size of 30 mm to 60 mm, and the shear groove is staggered with the structural reinforcement of the original bridge pier; Before planting reinforcement, use non-destructive detection equipment to find out the position of structural reinforcement, check and mark the position of the reinforcement hole, and control the position of the reinforcement hole to be staggered with the structural reinforcement of the original pier; drill holes according to the marks, control the hole depth to be the same as the buried depth of the anchor bar, and clean the reinforcement hole; Inject anchoring glue into the anchor hole, gradually injecting from the bottom of the hole to the outside, and control the injection depth to two-thirds of the hole depth; clean the surface dirt of the anchor bar, and rotate the anchor bar to insert it into the bottom of the hole, avoiding disturbing the anchor bar before the anchor glue solidifies.

10. The method for reinforcing piles of an existing long-span bridge structure underpinning and reinforcing system according to claim 7, characterized in that: In step S4, in the foundation pit of the pier beam, the structural steel bars of the pier beam are tied and connected with the anchor bars; the concrete surface of the original pier is cleaned and roughened by rough chiseling or sandblasting; Apply interface glue to the concrete surface of the original bridge pier. After the first layer of interface glue penetrates into the concrete and becomes gelled, apply the second layer of interface glue as a bonding layer. While the interface adhesive is within its applicable period, pour the concrete of the pedestal beam at one time, and carry out maintenance work after pouring is completed.

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